CN-122017563-A - Multi-type battery pack testing method, system, intelligent terminal and storage medium

CN122017563ACN 122017563 ACN122017563 ACN 122017563ACN-122017563-A

Abstract

The application relates to a method, a system, an intelligent terminal and a storage medium for testing a multi-type battery pack, which relate to the technical field of battery testing, and the method comprises the steps of supplying power to a medium-sized battery pack through a main power supply until the medium-sized battery pack is in a full-power state; the method comprises the steps of supplying power to a first large battery pack through a middle-sized battery pack, controlling the first large battery pack to supply power to a second large battery pack in response to a full electric signal of the first large battery pack, controlling an auxiliary battery middle-sized battery pack to supply power in response to a power supply completion signal of the first large battery pack to the second large battery pack, repeatedly executing all the steps to perform a charging cycle test until the preset charging cycle number is reached, acquiring battery information of the middle-sized battery pack, the first large battery pack and the second large battery pack, and acquiring performance indexes of the middle-sized battery pack, the first large battery pack and the second large battery pack according to the battery information and initial battery information. The application can improve the stability of testing the battery pack.

Inventors

LI XIAOHUA
MAO JUNPING
ZHANG MINGXI

Assignees

常州拜特测控技术有限公司

Dates

Publication Date: 20260512
Application Date: 20251224

Claims (10)

1. A method for testing a polytype battery pack, comprising: supplying power to the middle-sized battery pack through the general power source until the middle-sized battery pack is in a full-power state; Disconnecting the general power source from the middle-sized battery pack and supplying power to the first large-sized battery pack through the middle-sized battery pack; Disconnecting the middle-sized battery pack from the first power supply path of the first large-sized battery pack in response to a full electric signal of the first large-sized battery pack, and controlling the first large-sized battery pack to supply power to the second large-sized battery pack through the second power supply path; Controlling the auxiliary battery to supply power to the middle-sized battery pack through the third power supply path in response to a power supply completion signal of the first large-sized battery pack to the second large-sized battery pack until the second large-sized battery pack is in a zero-power state; Repeating all the steps to perform the charging cycle test until the preset charging cycle times are reached; Battery information of the middle-sized battery pack, the first large-sized battery pack, and the second large-sized battery pack is acquired, and performance indexes of the middle-sized battery pack, the first large-sized battery pack, and the second large-sized battery pack are acquired based on the battery information and the initial battery information.
2. The method for testing a multi-type battery pack according to claim 1, wherein in controlling the first large-sized battery pack to supply power to the second large-sized battery pack through the second power supply path, further comprising: acquiring first electric quantity information of a first large battery pack and second electric quantity information of a second large battery pack in real time; Obtaining a charge-discharge curve graph according to the first electric quantity information and the second electric quantity information; predicting a discharge end state of the first large-sized battery pack according to the charge-discharge curve graph, wherein the discharge end state comprises a first state and a second state, the first state refers to the fact that when the first electric quantity information is zero electric quantity, the second electric quantity information is not full electric quantity, the second state refers to the fact that when the second electric quantity information is full electric quantity, the first electric quantity information is not zero electric quantity; Under the condition that the discharge end state is the first state, acquiring a second electric quantity prediction missing value according to a charge-discharge curve; Determining an estimated power supplementing time point of the middle-sized battery pack according to a time point when the first electric quantity information is zero electric quantity in the charge-discharge graph; Supplying power to the second large battery pack through the middle-sized battery pack at the predicted power supplementing time point, so that the second large battery pack obtains the electric quantity corresponding to the predicted missing value; generating a power supply completion signal in response to the full electrical signal of the second large battery pack; Under the condition that the discharge end state is the second state, acquiring the estimated discharge time point of the first large-scale battery pack when the second electric quantity information is full electric quantity in the charge-discharge curve graph; Supplying power to the middle-sized battery pack through the first large-sized battery pack at an estimated discharge time point; a power supply completion signal is generated in response to the zero electrical signal of the first large battery pack.
3. The multi-type battery pack testing method according to claim 2, wherein when power is supplied to the second large-sized battery pack through the middle-sized battery pack at an estimated power supplementing time point, further comprising: acquiring a middle-sized remaining power of the middle-sized battery pack; acquiring a medium-sized power transmission loss value when the medium-sized battery pack supplies power to the second large-sized battery pack according to the power prediction loss value; calculating the sum of the predicted missing value of the electric quantity and the transmission loss value of the medium-sized electric quantity to obtain a required value of the medium-sized electric quantity; determining an estimated power supply time point at which the total power supply supplies power to the middle-sized battery pack according to the estimated power supply time point and the charge rate of the middle-sized battery pack in the case where the middle-sized remaining power is smaller than the middle-sized power demand value; supplying power to the middle-sized battery pack through the general power source at a predicted power supply time point; when the middle-sized remaining power reaches the middle-sized power required value, the connection of the general power source and the middle-sized battery pack is disconnected.
4. A multi-type battery pack testing method according to claim 3, further comprising: Acquiring a current charge-discharge graph according to the second large-sized battery pack information and the middle-sized battery pack information in a process of controlling the second battery pack to supply power to the middle-sized battery pack through the third power supply path in a case where the charge cycle test is greater than a preset number of times; acquiring a historical charge-discharge curve graph from a historical record; Obtaining the similarity of a current charge-discharge curve graph and a historical charge-discharge curve graph; determining an amount of shortage of the electric quantity of the middle-sized battery pack according to the current charge-discharge graph in the case that the similarity is greater than a preset similarity; dividing the middle-sized battery packs into groups according to the shortage of electric quantity to obtain a first battery group and a second battery group, wherein the first battery group is formed by one part of middle-sized battery packs powered by the second large-sized battery pack, and the second battery group is formed by the other part of middle-sized battery packs powered by the total power supply; charging the first large battery pack through the second battery pack in response to the full electrical signal of the second battery pack; In response to the full electrical signal of the first battery pack, the first battery pack and the second battery pack are integrated together to charge the main battery.
5. The multi-type battery pack testing method according to claim 4, characterized in that the method further comprises: determining a replacement grouping step size according to the number of middle-sized battery packs in the second battery grouping; performing sliding replacement selection on the number sequence of the current middle-sized battery pack based on the replacement grouping step length to obtain a second grouping number of the next round of charging cycle test; And determining a second battery group and a first battery group of the next round of charging cycle test according to the second group number.
6. The multi-type battery pack testing method according to claim 5, characterized in that the method further comprises: in the history record, acquiring a history second grouping number of each round of charging cycle test and the history output electric quantity of the total power supply corresponding to the history second grouping number; extracting target historical output electric quantity which is larger than adjacent historical output electric quantity in the historical output electric quantity; acquiring the occurrence frequency of the target historical output electric quantity; determining the alternate frequency according to the alternate grouping step length and the preset sliding alternate step length; Judging whether the occurrence frequency is equal to the round replacement frequency; If so, determining that the abnormal middle-sized battery pack exists in the second battery group corresponding to the historical second group number corresponding to the target historical output power quantity.
7. The multi-type battery pack testing method of claim 1, further comprising: After each round of charging cycle test is completed, recording the charging electric quantity change, discharging electric quantity change and corresponding time sequences of the middle-sized battery pack, the first large-sized battery pack and the second large-sized battery pack in the round of charging cycle test; Generating a cycle energy efficiency value of each battery pack according to the change of the charge electric quantity, the change of the discharge electric quantity and the corresponding time sequence; Accumulating and storing the cycle energy efficiency values of each round to form a cycle performance sequence of multiple rounds; calculating performance decay trend coefficients of each battery pack based on the cyclic performance sequence; and after the preset charging cycle times are reached, the performance indexes of the middle-sized battery pack, the first large-sized battery pack and the second large-sized battery pack are calibrated according to the performance decay trend coefficient.
8. A multi-type battery pack testing system for performing the multi-type battery pack testing method of any one of claims 1 to 7, comprising: An acquisition module for acquiring battery information of the middle-sized battery pack, the first large-sized battery pack, and the second large-sized battery pack; A memory for storing a program of the multi-type battery pack testing method; and the processor, the program in the memory can be loaded and executed by the processor and the multi-type battery pack testing method is realized.
9. An intelligent terminal comprising a memory and a processor, wherein the memory has stored thereon a computer program that can be loaded by the processor and that performs the method according to any of claims 1 to 7.
10. A computer readable storage medium, characterized in that a computer program is stored which can be loaded by a processor and which performs the method according to any of claims 1 to 7.

Description

Multi-type battery pack testing method, system, intelligent terminal and storage medium Technical Field The application relates to the technical field of battery testing, in particular to a method, a system, an intelligent terminal and a storage medium for testing a multi-type battery pack. Background With the rapid development of new energy industry and energy storage technology, large-capacity and multi-type battery packs are widely applied to energy storage power stations, power grid peak shaving, new energy grid connection and industrial grade electricity utilization scenes. In order to ensure the safety, reliability and consistency of the battery pack in the actual operation process, the battery pack is usually required to be subjected to charge-discharge cycle test for multiple times before leaving a factory or being put into use so as to obtain key performance indexes such as capacity, efficiency and attenuation. However, with the continuous increase in battery capacity and power level, existing test methods are increasingly exposed to significant deficiencies in practical applications. Particularly, when the megawatt power battery pack is subjected to charge and discharge test, the test system has extremely high requirements on the power supply capacity. The method is limited by the distribution condition of a factory and the capacity of a transformer, and the power grid side is generally difficult to directly and continuously provide megawatt-level stable charging power for test equipment, on the other hand, in the process of directly relying on the power grid to carry out megawatt-level charging and discharging test, the frequent start-stop and power fluctuation of a high-power battery pack easily cause the problems of voltage fluctuation, current impact, protection trip and the like of the power grid in the factory, the continuity and the accuracy of the test process are affected, and the normal operation of other electric equipment in the factory is possibly interfered, so that certain potential safety hazards exist. For the related technology, the stability of the battery pack is low when the battery pack is tested for multiple types and megawatts by directly using the power grid. Disclosure of Invention In order to improve stability of testing a battery pack, the application provides a multi-type battery pack testing method, a multi-type battery pack testing system, an intelligent terminal and a storage medium. In a first aspect, the present application provides a method for testing a multi-type battery pack, which adopts the following technical scheme: a method of testing a polytype battery pack, comprising: supplying power to the middle-sized battery pack through the general power source until the middle-sized battery pack is in a full-power state; Disconnecting the general power source from the middle-sized battery pack and supplying power to the first large-sized battery pack through the middle-sized battery pack; Disconnecting the middle-sized battery pack from the first power supply path of the first large-sized battery pack in response to a full electric signal of the first large-sized battery pack, and controlling the first large-sized battery pack to supply power to the second large-sized battery pack through the second power supply path; Controlling the auxiliary battery to supply power to the middle-sized battery pack through the third power supply path in response to a power supply completion signal of the first large-sized battery pack to the second large-sized battery pack until the second large-sized battery pack is in a zero-power state; Repeating all the steps to perform the charging cycle test until the preset charging cycle times are reached; Battery information of the middle-sized battery pack, the first large-sized battery pack, and the second large-sized battery pack is acquired, and performance indexes of the middle-sized battery pack, the first large-sized battery pack, and the second large-sized battery pack are acquired based on the battery information and the initial battery information. By adopting the technical scheme, the charging cycle test is completed through the hierarchical power supply and charge-discharge modes between the middle-sized battery pack and the first large-sized battery pack and between the middle-sized battery pack and the second large-sized battery pack, so that the power grid is not required to always provide megawatt continuous power in the test process, and the dependence on the power supply capacity of an external power grid is obviously reduced. Meanwhile, the power fluctuation and the power consumption impact of megawatt charging and discharging on a factory power grid are effectively reduced by disconnecting the total power supply and realizing the closed loop circulation of electric energy among the battery packs in the test process, so that the stability of the test process is improved while the continuity of the cyclic test of the ba