EP-4742482-A1 - TEMPERATURE PREDICTION METHOD, APPARATUS, ELECTRONIC DEVICE, AND ENERGY STORAGE SYSTEM

EP4742482A1EP 4742482 A1EP4742482 A1EP 4742482A1EP-4742482-A1

Abstract

The present disclosure provides a temperature prediction method and apparatus, an electronic device, a storage medium, and an energy storage system. The method includes: obtaining an ambient temperature and battery parameters of the energy storage device; obtaining a current first power, a third power, and a fourth power of the energy storage device; when a difference between the second power and the current first power is not less than the fourth power, determining a state of the energy storage device; outputting the predicted first power according to the state of the energy storage device; predicting the battery temperature of the energy storage device based on the ambient temperature, the battery parameters, and the predicted first power.

Inventors

JIANG, JUNJIE
Cao, Baojian

Assignees

Zhejiang Jinko Energy Storage Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20251015

Claims (15)

A temperature prediction method, applied to an energy storage device, wherein the method comprises: obtaining an ambient temperature and battery parameters of the energy storage device; obtaining a current first power, a third power, and a fourth power of the energy storage device, wherein the current first power is configured to indicate a current operating power of the energy storage device, the third power is configured to indicate an anti-reverse current threshold power of the energy storage device, and the fourth power is configured to indicate an anti-over-demand threshold power of the energy storage device; calculating a second power of the energy storage device, wherein the second power is configured to indicate a load power of the energy storage device, and determining a state of the energy storage device, in response to a difference between the second power and the current first power being not less than the fourth power; when the energy storage device is in a charging state, compensating a predicted first power based on the current first power, wherein the predicted first power is configured to indicate a predicted operating power of the energy storage device; determining whether a difference between the second power and the compensated predicted first power is less than the fourth power; in response to the difference between the second power and the compensated predicted first power being less than the fourth power, outputting the predicted first power; and in response to the difference between the second power and the predicted first power being not less than the fourth power, adding a preset first adjustment value to the predicted first power until the difference between the second power and the current first power is less than the fourth power, and outputting the adjusted predicted first power; when the energy storage device is in a discharging state, compensating the predicted first power based on the current first power; determining whether the difference between the second power and the predicted first power is less than the fourth power; in response to the difference between the second power and the predicted first power being less than the fourth power, outputting the predicted first power; in response to the difference between the second power and the predicted first power being not less than the fourth power, adding the preset first adjustment value to the predicted first power until the difference between the second power and the current first power is less than the fourth power, and outputting the adjusted predicted first power; when the energy storage device is in a static fully-charged state, setting the predicted first power to zero; determining whether the difference between the second power and the predicted first power is less than the fourth power; in response to the difference between the second power and the predicted first power being less than the fourth power, outputting the predicted first power; in response to the difference between the second power and the predicted first power being not less than the fourth power, adding the preset first adjustment value to the predicted first power until the difference between the second power and the current first power is less than the fourth power, and outputting the adjusted predicted first power; and predicting a battery temperature of the energy storage device based on the ambient temperature, the battery parameters, and the predicted first power.
The temperature prediction method according to claim 1, wherein the battery parameters include a parameter of state of charge (SOC) and a parameter of state of health (SOH).
The temperature prediction method according to claim 1 or 2, wherein the calculating a second power of the energy storage device comprises: calculating the second power of the energy storage device based on historical power data, date data, weather condition, and air quality of the energy storage device.
The temperature prediction method according to any one of the preceding claims, wherein the calculating the second power of the energy storage device based on historical power data, date data, weather condition, and air quality of the energy storage device comprises: inputting the historical power data, date data, weather condition, and air quality of the energy storage device into a preset model, to output power load demand of the energy storage device and calculate the second power of the energy storage device.
The temperature prediction method according to any one of the preceding claims, further comprising: in response to the difference between the second power and the current first power being not greater than the third power, adjusting the predicted first power based on the current first power and a preset second adjustment value.
The temperature prediction method according to any one of the preceding claims, wherein the determining a state of the energy storage device and adjusting the first power comprises: when the energy storage device is in the charging state, increasing the predicted first power until the charging state stops; when the energy storage device is in the discharging state, increasing the predicted first power for discharging; and when the energy storage device is in the static fully-charged state, increasing the predicted first power for discharging.
The temperature prediction method according to claim 5 or 6, wherein the adjusting the predicted first power based on the current first power and a preset second adjustment value comprises: in response to the difference between the second power and the current first power being not greater than the third power, compensating the predicted first power based on the current first power; determining whether the difference between the second power and the predicted first power is greater than the third power; in response to the difference between the second power and the predicted first power being greater than the third power, outputting the predicted first power; and in response to the difference between the second power and the predicted first power being not greater than the third power, subtracting the preset second adjustment value from the predicted first power until the difference between the second power and the current first power is greater than the third power, and outputting the adjusted predicted first power.
The temperature prediction method according to any one of the preceding claims, wherein the energy storage device further comprises a liquid cooler, and the predicting battery temperature of the energy storage device based on the ambient temperature, the battery parameters, and the predicted first power comprises: training a temperature prediction model based on the second power, the ambient temperature, the battery parameters, and power of the liquid cooler; and inputting the ambient temperature, the battery parameters, and the predicted first power into the temperature prediction model to predict the battery temperature of the energy storage device.
The temperature prediction method according to any one of the preceding claims, wherein the battery temperature of the energy storage device comprises a maximum cell temperature T1 and a minimum cell temperature T2, and the method further comprises: obtaining a first liquid-cooling mode, wherein the first liquid-cooling mode is a current liquid-cooling mode of the energy storage device; and determining a second liquid-cooling mode based on the first liquid-cooling mode, the maximum cell temperature T1, and/or the minimum cell temperature T2, wherein the second liquid-cooling mode is a liquid-cooling mode of the energy storage device after a first duration.
The temperature prediction method according to claim 9, wherein liquid-cooling modes of the energy storage device comprise a shutdown mode, a first-level cooling mode, a second-level cooling mode, a third-level cooling mode, a self-circulation mode, and a heating mode, and target water temperatures of the heating mode, the first-level cooling mode, the second-level cooling mode, and the third-level cooling mode decrease in sequence.
The temperature prediction method according to claim 9 or 10, wherein the determining a second liquid-cooling mode based on the first liquid-cooling mode, the maximum cell temperature T1, and/or the minimum cell temperature T2 comprises: in a case where the first liquid-cooling mode is the shutdown mode, determining the second liquid-cooling mode, comprising: when T1 ≥ 38°C and T2 ≥ 12°C, determining that the second liquid-cooling mode is the third-level cooling mode; when the energy storage device is in the discharging state or a standby state, with 35°C ≤ T1 < 38°C and T2 ≥ 12°C, or when the energy storage device is in the charging state, with 33°C ≤ T1 < 38°C and T2 ≥ 12°C, determining that the second liquid-cooling mode is the second-level cooling mode; when 27°C ≤ T1 < 33°C and T2 ≥ 12°C, determining that the second liquid-cooling mode is the first-level cooling mode; when T1 - T2 ≥ 5°C, determining that the second liquid-cooling mode is the self-circulation mode; or when T1 < 27°C and T2 ≤ 12°C, determining that the second liquid-cooling mode is the heating mode, or in a case where the first liquid-cooling mode is the third-level cooling mode, with T1 ≤ 36°C, determining that the second liquid-cooling mode is the second-level cooling mode, or in a case where the first liquid-cooling mode is the second-level cooling mode, with T1 ≥ 38°C, determining that the second liquid-cooling mode is the third-level cooling mode; or when the energy storage device is in the discharging state or a standby state, with T1 ≤ 33°C, or when the energy storage device is in the charging state, with T1 ≤ 31°C, determining that the second liquid-cooling mode is the first-level cooling mode, or in a case where the first liquid-cooling mode is the first-level cooling mode, determining the second liquid-cooling mode, comprising: when the energy storage device is in the discharging state or a standby state, with T1 ≥ 35°C, or when the energy storage device is in the charging state, with T1 ≥ 33°C, determining that the second liquid-cooling mode is the second-level cooling mode; or when T1 ≤ 25°C or T2 ≤ 9°C, determining that the second liquid-cooling mode is the self-circulation mode, or in a case where the first liquid-cooling mode is the self-circulation mode, determining the second liquid-cooling mode, comprising: when T1 ≥ 27°C and T2 ≤ 9°C, determining that the second liquid-cooling mode is the first-level cooling mode; when T1 < 27°C and T2 ≤ 12°C, determining that the second liquid-cooling mode is the heating mode; or when T1 - T2 ≤ 5°C, determining that the second liquid-cooling mode is the shutdown mode, or in a case where the first liquid-cooling mode is the heating mode, when T1 ≥ 30°C or T2 ≤ 15°C, determining that the second liquid-cooling mode is the self-circulation mode.
The temperature prediction method according to any one of the preceding claims, further comprising: in response to the second power being greater than the third power and the second power being less than the fourth power, determining that the predicted first power is the second power.
A temperature prediction apparatus, applied to an energy storage device, wherein the temperature prediction apparatus comprises: an acquisition module configured to obtain an ambient temperature and battery parameters of the energy storage device, and further configured to obtain a current first power, a third power and a fourth power of the energy storage device, wherein the current first power is configured to indicate a current operating power of the energy storage device, the third power is configured to indicate an anti-reverse current threshold power of the energy storage device, and the fourth power is configured to indicate an anti-over-demand threshold power of the energy storage device; a calculation module configured to calculate a second power of the energy storage device, and further configured to determine a state of the energy storage device, in response to a difference between the second power and the current first power being not less than the fourth power, wherein the second power is configured to indicate a load power of the energy storage device; a compensation module configured to: when the energy storage device is in a charging state, compensate a predicted first power based on the current first power, wherein the predicted first power is configured to indicate a predicted operating power of the energy storage device; determine whether a difference between the second power and the compensated predicted first power is less than the fourth power; in response to the difference between the second power and the compensated predicted first power being less than the fourth power, output the predicted first power; and in response to the difference between the second power and the predicted first power being not less than the fourth power, add a preset first adjustment value to the predicted first power until the difference between the second power and the current first power is less than the fourth power, and output the adjusted predicted first power; wherein the compensation module is further configured to: when the energy storage device is in a discharging state, compensate the predicted first power based on the current first power; determine whether the difference between the second power and the predicted first power is less than the fourth power; in response to the difference between the second power and the predicted first power being less than the fourth power, output the predicted first power; and in response to the difference between the second power and the predicted first power being not less than the fourth power, add the preset first adjustment to the predicted first power until the difference between the second power and the current first power is less than the fourth power, and output the adjusted predicted first power; wherein the compensation module is further configured to: when the energy storage device is in a static fully-charged state, set the predicted first power to zero; determine whether the difference between the second power and the predicted first power is less than the fourth power; in response to the difference between the second power and the predicted first power being less than the fourth power, output the predicted first power; and in response to the difference between the second power and the predicted first power being not less than the fourth power, add the preset first adjustment value to the predicted first power until the difference between the second power and the current first power is less than the fourth power, and output the adjusted predicted first power; wherein the temperature prediction apparatus further comprises: a prediction module configured to predict a battery temperature of the energy storage device based on the ambient temperature, the battery parameters and the predicted first power.
An electronic device, comprising at least one processor and a memory, wherein the memory is configured to store a computer program, and the at least one processor is configured to run the computer program, and execute the temperature prediction method according to any one of claims 1 to 12 when the computer program is run on a computer.
An energy storage system, comprising a battery pack, a power conversion system (PCS) and an energy management system (EMS), wherein the EMS is configured to implement the temperature prediction method according to any one of claims 1 to 12.

Description

TECHNICAL FIELD The present disclosure relates to the field of energy storage technologies, and in particular, to a temperature prediction method and apparatus, an electronic device, a storage medium, and an energy storage system. BACKGROUND In an energy storage system, it is necessary to ensure that the cells of the energy storage batteries in the energy storage cabinet and the associated electrical equipment operate within a safe temperature range. In the related art, the temperature change of cells is predicted based on the changes in various data of the energy storage cabinet, and the battery is charged and discharged according to a planned long-term stable curve. However, under the anti-reverse current and anti-over-demand strategies in specific scenarios, the accurate temperature may not be easily predicted. SUMMARY In view of the above, the present disclosure provides a temperature prediction method and apparatus, an electronic device, a storage medium, and an energy storage system, which helps to solve the problem that the battery temperature change of the energy storage device may not be accurately predicted under the anti-reverse current and anti-over-demand strategies. In a first aspect, the present disclosure provides a temperature prediction method applied to an energy storage device, including: obtaining an ambient temperature and battery parameters of the energy storage device; obtaining a current first power, a third power, and a fourth power of the energy storage device, the current first power is configured to indicate a current operating power of the energy storage device, the third power is configured to indicate an anti-reverse current threshold power of the energy storage device, and the fourth power is configured to indicate an anti-over-demand threshold power of the energy storage device; calculating a second power of the energy storage device, the second power is configured to indicate a load power of the energy storage device; determining a state of the energy storage device in response to a difference between the second power and the current first power being not less than the fourth power. When the energy storage device is in a charging state, the method further includes: compensating a predicted first power based on the current first power, the predicted first power is configured to indicate a predicted operating power of the energy storage device; determining whether a difference between the second power and the compensated predicted first power is less than the fourth power; outputting the predicted first power in response to the difference between the second power and the compensated predicted first power being less than the fourth power; adding a preset first adjustment value to the predicted first power until the difference between the second power and the current first power is less than the fourth power in response to the difference between the second power and the predicted first power being not less than the fourth power, and outputting the adjusted predicted first power. When the energy storage device is in a discharging state, the method further includes: compensating the predicted first power based on the current first power; determining whether the difference between the second power and the predicted first power is less than the fourth power; outputting the predicted first power in response to the difference between the second power and the predicted first power being less than the fourth power; adding the preset first adjustment value to the predicted first power until the difference between the second power and the current first power is less than the fourth power in response to the difference between the second power and the predicted first power being not less than the fourth power, and output the adjusted predicted first power. When the energy storage device is in a static fully-charged state, the method further includes: set the predicted first power to zero; determining whether the difference between the second power and the predicted first power is less than the fourth power; output the predicted first power in response to the difference between the second power and the predicted first power is less than the fourth power; adding the preset first adjustment value to the predicted first power until the difference between the second power and the current first power is less than the fourth power in response to the difference between the second power and the predicted first power is not less than the fourth power, and outputting the adjusted predicted first power. The method further includes: predicting battery temperature of the energy storage device based on the ambient temperature, the battery parameters, and the predicted first power. In one or more embodiments, the battery parameters include a parameter of state of charge (SOC) and a parameter of state of health (SOH). In one or more embodiments, the calculating a second power of the energy storage device