CN-122008965-A - Control method and device for adaptively adjusting super-charging current and vehicle

CN122008965ACN 122008965 ACN122008965 ACN 122008965ACN-122008965-A

Abstract

The invention discloses a control method, a device and a vehicle for adaptively adjusting a super-charging current, wherein the method comprises the steps of obtaining initial temperature of a battery pack cell and initial electric quantity of the battery pack when a vehicle gun charging signal is received, cooling if the initial temperature of the battery pack cell is in a first temperature interval and the initial electric quantity is smaller than or equal to a first preset electric quantity, charging the battery pack according to a preset minimum current value, and executing a dynamic charging step when the charging time is equal to the first preset time, wherein the current temperature and the current residual electric quantity of the battery cell are obtained, controlling the running state of a thermal management system according to the current temperature, determining charging request current required by the battery pack according to the current temperature and the current residual electric quantity, charging based on the charging request current, and repeatedly executing the dynamic charging step until the current residual electric quantity reaches the preset electric quantity. The method effectively controls the temperature rise of the battery pack in the overcharging process.

Inventors

WANG XUMIN
XIA KAI
XIONG XIAOWEI
DONG ZHUANG

Assignees

东风汽车集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (10)

1. A control method for adaptively adjusting a super-charge current, comprising: when a vehicle gun inserting charging signal is received, acquiring the initial temperature of a battery pack cell and the initial electric quantity of a battery pack; If the initial temperature of the battery cell is in a first temperature interval and the initial electric quantity is smaller than a first preset electric quantity, a battery pack thermal management system is started to cool, the battery pack is charged according to a preset minimum current value, and when the charging duration is equal to a first preset duration, the following dynamic charging steps are executed: Acquiring the current temperature of the battery cell and the current residual electric quantity of the battery pack; controlling the running state of the thermal management system according to the current temperature of the battery cell, determining a charging request current required by the battery pack according to the current temperature of the battery cell and the current residual electric quantity, and charging based on the charging request current to obtain the current residual electric quantity after charging; and repeating the dynamic charging step until the current residual electric quantity reaches a preset electric quantity, wherein the maximum value of the first temperature interval is larger than a set temperature.
2. The control method for adaptively adjusting a super-charge current as set forth in claim 1, further comprising: If the initial temperature is in a second temperature interval and the initial electric quantity is smaller than a second preset electric quantity, starting the thermal management system to cool, and detecting whether the temperature of a water inlet in the thermal management system is in a target temperature; and if the temperature is at the target temperature, charging the battery pack according to the dynamic charging step after a second preset time period, wherein the second preset electric quantity is larger than the first preset electric quantity, and the minimum value of the second temperature interval is larger than the maximum value of the first temperature interval.
3. The control method for adaptively adjusting a super-charge current as set forth in claim 2, further comprising: If the initial temperature is in the third temperature interval or the fourth temperature interval, charging the battery pack according to the dynamic charging step; the maximum value of the third temperature interval is smaller than the minimum value of the first temperature interval, and the minimum value of the fourth temperature interval is larger than the maximum value of the second temperature interval.
4. The method of claim 3, wherein the first temperature interval is [30 ℃,40 ℃, the second temperature interval is [40 ℃,50 ℃, the third temperature interval is [0 ℃,30 ℃, and the fourth temperature interval is [50 ℃,55 ℃.
5. The control method for adaptively adjusting a super-charge current as set forth in claim 2, further comprising: And if the initial temperature is in a first temperature interval and the initial electric quantity is larger than the first preset electric quantity, or if the initial temperature is in a second temperature interval and the initial electric quantity is larger than the second preset electric quantity, charging the battery pack according to the dynamic charging step.
6. The method for adaptively adjusting a overcharge current according to claim 1, wherein said determining a charge request current required for said battery pack according to a current temperature of said battery cell and said current remaining power comprises: and according to the current temperature of the battery cell and the current residual electric quantity, a first preset relation table is checked to determine the charging request current required by the battery pack, wherein the first preset relation table comprises the mapping relation among the current temperature of the battery cell, the current residual electric quantity and the charging request current.
7. The control method for adaptively adjusting a super-charge current as set forth in claim 1, further comprising: if the initial temperature of the battery cell is in a fifth temperature interval, acquiring the environment temperature of the vehicle; If the ambient temperature is less than the preset minimum temperature, charging the battery pack according to the dynamic charging step, and acquiring the current temperature of the battery cell in the charging process according to the dynamic charging step; If the current temperature of the battery cell is greater than the preset safety temperature, acquiring the current residual electric quantity of the battery pack; And repeatedly executing the dynamic charging step until the current residual capacity reaches the preset capacity, wherein the second preset relation table comprises a mapping relation among the current temperature, the current residual capacity and the charging request current of the battery core, the first preset relation table corresponds to the dimension of the second preset relation table, and under the combination of the current temperature and the current residual capacity of the same battery core, the charging request current in the second preset relation table is a preset multiple of the corresponding charging request current in the first preset relation table, and the preset multiple is between 0 and 1.
8. The method of controlling adaptive adjustment of a super-charge current as claimed in claim 7, further comprising: and if the ambient temperature is greater than or equal to the preset minimum temperature, charging the battery pack according to the dynamic charging step.
9. A control device for adaptively adjusting a super-charge current, comprising: The first acquisition module is used for acquiring the initial temperature of the battery pack cell and the initial electric quantity of the battery pack when receiving a vehicle gun inserting charging signal; The first control module is used for starting the battery pack thermal management system to cool if the initial temperature of the battery cell is in a first temperature interval and the initial electric quantity is smaller than or equal to a first preset electric quantity, charging the battery pack according to a preset minimum current value, and executing the following dynamic charging steps when the charging duration is equal to a first preset duration: the second acquisition module is used for acquiring the current temperature of the battery cell and the current residual electric quantity of the battery pack; The charging control module is used for controlling the running state of the thermal management system according to the current temperature of the battery core, determining the charging request current required by the battery pack according to the current temperature of the battery core and the current residual electric quantity, charging based on the charging request current to obtain the charged current residual electric quantity, and repeatedly executing the dynamic charging step until the current residual electric quantity reaches the preset electric quantity.
10. A vehicle comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method according to any one of claims 1-8 when the program is executed.

Description

Control method and device for adaptively adjusting super-charging current and vehicle Technical Field The invention relates to the technical field of battery thermal management, in particular to a control method and device for adaptively adjusting a super-charging current and a vehicle. Background The new energy vehicles have higher and higher duty ratio, and the charging efficiency of the electric automobile is generally focused. The common standard fast charging can only support 250A charging current, and the super fast charging current is larger, so that the method is one of methods for saving charging time. The super-charging pile supports 250kW and 350kW high-power output, and can provide large current of more than 400A. The ultra-charging high current of 4C and 5C of the 800V platform vehicle supporting the ultra-charging becomes the main stream of the market. The higher the overcharging current, the higher the charging efficiency, but with a significant increase in thermal effects, which is also a more serious challenge. In the charging process, even if the thermal management is always cooling, the temperature of the battery core is continuously increased, and finally the BMS battery is triggered to protect, so that the charging current is forcibly reduced in order to avoid over-temperature. For example, during the fast charge process, the temperature of the battery cell increases to 50 ℃ to trigger battery protection, and at the moment, the current is required to dip, and the table look-up of the fast charge MAP is 0.5 ℃, so that the overall charging time of the electric automobile is prolonged. Disclosure of Invention The embodiment of the application provides a control method, a control device and a vehicle for adaptively adjusting the overcharge current, which can adaptively adjust the charge current in the overcharge process, flexibly control the starting time of a thermal management system, effectively control the temperature rise of a battery pack in the overcharge process, avoid the suspension of charge caused by the overheat of the battery and shorten the charge time. In a first aspect, the present invention provides, according to an embodiment of the present invention, the following technical solutions: A control method for adaptively adjusting the overcharge current comprises the steps of obtaining the initial temperature of a battery pack cell and the initial electric quantity of a battery pack when a vehicle gun charging signal is received, starting a battery pack thermal management system to cool and charge the battery pack according to a preset minimum current value if the initial temperature of the battery pack cell is in a first temperature interval and the initial electric quantity is smaller than a first preset electric quantity, and executing the dynamic charging step when the charging time length is equal to a first preset time length, wherein the current temperature of the battery cell and the current residual electric quantity of the battery pack are obtained, the running state of the thermal management system is controlled according to the current temperature of the battery cell, charging is carried out according to the current temperature of the battery cell and the current residual electric quantity, charging is carried out according to the charging request current, and the dynamic charging step is repeatedly executed until the current residual electric quantity reaches a preset maximum value of the first temperature interval. Preferably, the method further comprises starting the thermal management system to cool if the initial temperature is in a second temperature interval and the initial electric quantity is smaller than a second preset electric quantity, detecting whether the temperature of a water inlet in the thermal management system is at a target temperature, and charging the battery pack according to the dynamic charging step after a second preset time period if the temperature is at the target temperature, wherein the second preset electric quantity is larger than the first preset electric quantity, and the minimum value of the second temperature interval is larger than the maximum value of the first temperature interval. Preferably, the method further comprises the step of charging the battery pack according to the dynamic charging step if the initial temperature is in a third temperature interval or a fourth temperature interval, wherein the maximum value of the third temperature interval is smaller than the minimum value of the first temperature interval, and the minimum value of the fourth temperature interval is larger than the maximum value of the second temperature interval. Preferably, the first temperature interval is [30 ℃,40 ℃, the second temperature interval is [40 ℃,50 ℃, the third temperature interval is [0 ℃,30 ℃) and the fourth temperature interval is [50 ℃,55 ]. Preferably, the method further comprises charging the battery pack according to the dy