CN110687465A - Battery pack health state detection system and test method - Google Patents
Battery pack health state detection system and test method Download PDFInfo
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- CN110687465A CN110687465A CN201910979667.3A CN201910979667A CN110687465A CN 110687465 A CN110687465 A CN 110687465A CN 201910979667 A CN201910979667 A CN 201910979667A CN 110687465 A CN110687465 A CN 110687465A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The application provides a battery pack health state detection system and a battery pack health state testing method, wherein the system comprises: the device comprises a pressure sensor, a charging and discharging unit, a charging capacity detection unit and a processing unit; the pressure sensor is used for being arranged on a battery module in the battery pack to be detected according to preset pretightening force and detecting the expansion force value of the battery module; the processing unit is connected with the pressure sensor, the charging and discharging unit and the charging capacity detection unit, and is used for controlling the charging and discharging unit to charge the battery pack to be detected, controlling the charging capacity detection unit to detect the charging capacity of the battery pack to be detected, and determining the health state detection result of the battery pack to be detected according to the expansion force value of the module and the charging capacity of the battery pack to be detected. According to the battery pack health detection method and device, on the basis of the charging capacity of the battery pack, the expansion force value of the module is introduced to carry out health detection on the battery pack, the reliability of the health detection result of the battery pack to be detected is improved, and the safety risk of the battery pack is reduced.
Description
Technical Field
The present disclosure relates to battery technologies, and particularly to a system and a method for testing a health status of a battery pack.
Background
Lithium ion batteries have been widely used in the fields of electric vehicles, energy storage systems, and the like because of their advantages of high energy density, long service life, and the like. The lithium battery is continuously aged in the recycling process, the internal resistance is increased, the capacity is attenuated, and the appearance is expanded. The State of Health (SOH) of the battery represents the degradation degree of the battery, affects the reliability and safety of the electric vehicle, and is an important detection parameter in a battery management system. Therefore, the method has important significance for rapidly and effectively evaluating and monitoring the SOH of the battery and the battery pack for electric equipment such as an electric automobile.
The SOH detection method of the conventional electric vehicle mainly evaluates the SOH of a battery pack by using a driving mileage or a battery actual capacity.
However, the existing battery health state detection reliability is not high enough.
Disclosure of Invention
The embodiment of the application provides a battery pack health state detection system and a battery pack health state detection method, so that the health state detection reliability of a battery pack is improved, and the safety of the battery pack is further improved.
According to a first aspect of the present application, there is provided a battery pack state of health detection system comprising: the device comprises a pressure sensor, a charging and discharging unit, a charging capacity detection unit and a processing unit;
the pressure sensor is used for being arranged on a battery module in the battery pack to be detected according to preset pretightening force and detecting the expansion force value of the battery module;
the processing unit is connected with the pressure sensor, the charging and discharging unit and the charging capacity detection unit, and is used for controlling the charging and discharging unit to charge the battery pack to be detected, controlling the charging capacity detection unit to detect the charging capacity of the battery pack to be detected, and determining the health state detection result of the battery pack to be detected according to the module expansion force value and the charging capacity of the battery pack to be detected.
In some embodiments, the charging capacity detecting unit is configured to detect, in response to the control of the processing unit, the electric quantity of the battery pack to be tested as the charging capacity of the battery pack to be tested when it is determined that the battery pack to be tested is continuously charged from zero electric quantity to full charge.
In some embodiments, the battery pack to be tested includes a plurality of battery modules, and the module expansion force value is the expansion force value of each battery module detected by the pressure sensor when the battery pack to be tested is fully charged;
the processing unit is specifically used for determining a maximum expansion force value of the module from the expansion force values of the plurality of battery modules; and determining the health state detection result of the battery pack to be detected according to the maximum expansion value of the module and the charging capacity of the battery pack to be detected.
In some embodiments, the processing unit is further specifically configured to obtain preset calibration information of a battery health state, and determine a health state detection result of the battery pack to be detected according to the calibration information of the battery health state, the maximum expansion force value of the module, and the charging capacity; the battery health state calibration information comprises a plurality of battery health state calibration values, and a module maximum expansion force reference value and a battery pack reference charging capacity which correspond to each battery health state calibration value.
In some embodiments, the processing unit is further configured to generate the calibration information of the battery health state before controlling the charging and discharging unit to charge the battery pack to be tested, controlling the charging capacity detecting unit to detect the charging capacity of the battery pack to be tested, and determining the result of detecting the health state of the battery pack to be tested according to the module expansion force value and the charging capacity of the battery pack to be tested.
In some embodiments, the pressure sensor is further configured to set a reference cell with a preset pretightening force before being set on a battery module in the battery pack to be tested, and detect a cell expansion force reference value of the reference cell;
the processing unit is specifically configured to control the charging and discharging unit to perform multiple cycles of discharging and charging the reference battery cell in sequence until the cell reference charging capacity of the reference battery cell is less than or equal to a preset end-of-life capacity; and in each cycle processing, controlling the charging capacity detection unit to detect a cell reference charging capacity of the reference battery cell and to acquire the cell expansion force reference value from the pressure sensor; respectively converting the monomer reference charging capacity and the monomer expansion force reference value obtained in each circulation treatment into a battery pack reference charging capacity and a module maximum expansion force reference value; setting a battery health state calibration value for the battery pack reference charging capacity and the module maximum expansion force reference value corresponding to each circulation processing; and taking the reference charging capacity of the battery pack, the maximum expansion force reference value of the module and the battery health state calibration value corresponding to each circulation processing as the calibration information of the battery health state.
In some embodiments, the processing unit is specifically configured to multiply the monomer reference charging capacity obtained in each cyclic processing by the number of parallel connected battery monomers in the battery pack to be tested, so as to obtain the battery pack reference charging capacity corresponding to each cyclic processing.
In some embodiments, the processing unit is specifically configured to multiply the monomer expansion force reference value obtained in each cyclic processing by the number of battery monomers included in each battery module in the battery pack to be tested and a preset calibration coefficient to obtain a module maximum expansion force reference value corresponding to each cyclic processing.
In some embodiments, the pre-load force has a value greater than or equal to 300 newtons and less than or equal to 5000 newtons.
According to a second aspect of the present application, there is provided a method for detecting a health status of a battery pack, which is applied to a processing unit in the system for detecting a health status of a battery pack according to the first aspect of the present application and various possible designs of the first aspect of the present application, the method including:
and controlling the charging and discharging unit to charge the battery pack to be detected, controlling the charging capacity detection unit to detect the charging capacity of the battery pack to be detected, and determining the health state detection result of the battery pack to be detected according to the module expansion force value and the charging capacity of the battery pack.
According to a third aspect of the present application, there is provided an electronic device comprising: the battery pack health state detection method comprises a memory, a processor and a computer program, wherein the computer program is stored in the memory, and the processor runs the computer program to execute the battery pack health state detection method of the second aspect and various possible designs of the second aspect of the application.
According to a fourth aspect of the present application, a readable storage medium is provided, in which a computer program is stored, which, when being executed by a processor, is configured to implement the battery pack state of health detection method according to the second aspect of the present application and various possible designs of the second aspect of the present application.
The application provides a battery pack health state detection system and a battery pack health state testing method, wherein the system comprises: the device comprises a pressure sensor, a charging and discharging unit, a charging capacity detection unit and a processing unit; the pressure sensor is used for being arranged on a battery module in the battery pack to be detected according to preset pretightening force and detecting the expansion force value of the battery module; the processing unit is connected with the pressure sensor, the charging and discharging unit and the charging capacity detection unit, and is used for controlling the charging and discharging unit to charge the battery pack to be detected, controlling the charging capacity detection unit to detect the charging capacity of the battery pack to be detected, and determining the health state detection result of the battery pack to be detected according to the module expansion force value and the charging capacity of the battery pack to be detected. According to the battery pack state of health detection method and device, on the basis of the charging capacity of the battery pack, the expansion force value of the module is introduced to carry out state of health detection on the battery pack, and the reliability of the state of health detection result of the battery pack to be detected is improved.
Drawings
Fig. 1 is a block diagram of a system for detecting a state of health of a battery pack according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of a method for detecting a health status of a battery pack according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be understood that, in the various embodiments of the present application, the size of the serial number of each process does not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
It should be understood that, in this application, "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in this application, "plurality" means two or more. It should be understood that in the present application, "B corresponding to a", "a corresponds to B", or "B corresponds to a" means that B is associated with a, from which B can be determined. Determining B from a does not mean determining B from a alone, but may be determined from a and/or other information. And the matching of A and B means that the similarity of A and B is greater than or equal to a preset threshold value.
As used herein, "if" may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context.
The technical solution of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The SOH detection method of the battery pack of the existing electric automobile mainly evaluates the SOH of the battery pack by the driving mileage or the actual capacity of the battery. However, as the battery pack is gradually aged, the expansion force of the battery module in the battery pack is gradually increased, and when the battery is aged to a certain degree, the expansion force of the battery can cause some safety problems.
In order to solve the problems in the prior art, the application provides a system and a method for detecting the health state of a battery pack, and the health of the battery pack is detected by detecting the expansion force value of a module in the battery pack and the charging capacity of the battery pack. The battery pack to be tested can be installed in the electric vehicle, or can be installed in other electric equipment, and the following example is given by the electric vehicle.
In some application scenarios, the battery pack state of health detection system may be located in a maintenance site. For example, when an electric vehicle is subjected to vehicle maintenance on an irregular basis, a vehicle maintenance worker may perform state of health detection on a battery pack to be tested in the electric vehicle by using a battery pack state of health detection system according to various embodiments of the present application. The battery pack health state detection system can also prompt or give an alarm to a user or maintenance personnel according to the obtained health state detection result of the battery pack to be detected. For example, when the health state detection result of the battery pack to be detected indicates that the health value of the battery pack is lower than the health threshold value, a warning that the battery pack needs to be replaced urgently is given.
In other application scenarios, or in combination with the above scenarios, the battery pack health status detection system may be installed in an electric vehicle. The system for detecting the health state of the battery pack built in the electric automobile can execute various functions according to the starting operation of a user so as to realize the health state detection of the vehicle-mounted battery pack. Or the battery pack health state detection system is connected with the trigger unit. The triggering unit detects the use habits of users, and when the electric automobile is judged to be in an idle state for a long time, such as a flameout state at night, the triggering unit triggers the battery pack health state detection system to execute the function of detecting the health state of the battery pack.
Referring to fig. 1, a block diagram of a system for detecting a state of health of a battery pack according to an embodiment of the present disclosure is shown. As shown in fig. 1, the battery pack state of health detection system includes: the device comprises a pressure sensor, a charging and discharging unit, a charging capacity detection unit and a processing unit.
The pressure sensor is used for setting a battery module in the battery pack to be tested with preset pretightening force, and detecting the module expansion force value of the battery module. In some embodiments, the battery module compresses the plurality of battery cells from both sides with two end plates, and is wound and bound with an end plate band. The pressure sensor can be arranged between the battery monomer and the end plate on two sides of the module battery module, and the end plate vertically presses the pressure sensor at the centers of the two battery monomers closest to the end plate in the battery module with pretightening force. It can be understood that at least one battery module is disposed in the battery pack, and the battery modules are electrically connected with each other. The center position of the battery monomer near the end plate side of the battery module is provided with a pressure sensor. The pressure sensor is arranged in the vertical direction of a battery single pole piece of the battery module, for example, so as to collect the expansion force of the battery module in the direction. In this embodiment, the pre-tightening force may be, for example, greater than or equal to 300 newtons and less than or equal to 5000 newtons. The pressure sensor can collect the module expansion force value of the battery module and send the module expansion force value to the processing unit.
As shown in fig. 1, the processing unit is connected to the pressure sensor, the charge/discharge unit, and the charge capacity detection unit. And the processing unit is used for performing coordination control on the work of the pressure sensor, the charging and discharging unit and the charging capacity detection unit. For example, the processing unit is configured to control the charging and discharging unit to charge the battery pack to be tested, control the charging capacity detection unit to detect the charging capacity of the battery pack to be tested, and determine the health status detection result of the battery pack to be tested according to the module expansion force value and the charging capacity of the battery pack to be tested.
The acquisition of the charging capacity of the battery pack can be acquired when the charging process of the battery pack to be detected is detected and the battery pack is continuously charged from zero electric quantity to full electric quantity, so that the accuracy of the charging capacity of the battery pack can be improved. For example, the charging capacity detection unit is configured to detect, in response to the control of the processing unit, the electric quantity of the battery pack to be tested as the charging capacity of the battery pack to be tested when it is determined that the battery pack to be tested is continuously charged from zero electric quantity to full charge. The charging capacity detection unit can also monitor the charging process of the battery pack to be detected, and if the battery pack to be detected is monitored to be continuously charged from the emptying state of zero electric quantity and the electric quantity continuously rises to the full-charge state, the charging process is determined to be from the zero electric quantity to the full-charge state.
In some embodiments, the battery pack to be tested has a plurality of battery modules therein. And the module expansion force value is the expansion force value of each battery module detected by the pressure sensor when the battery pack to be detected is fully charged. It can be understood that the pressure sensor monitors the expansion force of the battery modules, and when the battery pack to be tested is charged to full charge, the pressure sensor feeds back the module expansion force value of each battery module when the battery pack to be tested is fully charged to the processing unit according to the instruction sent by the processing unit.
In some embodiments where the battery pack under test has multiple module expansion force values, the maximum module expansion force value is one of the factors that has the greatest impact on the health of the battery pack under test. For example, when the battery pack to be tested is seriously aged, the battery module with the largest module expansion force has the greatest safety risk. Therefore, the health state detection of the battery pack to be detected can be performed according to the maximum module expansion force value, namely the maximum expansion force value of the following module. Specifically, in order to improve the accuracy of detecting the health state of the battery pack to be detected, the processing unit may be specifically configured to determine a maximum expansion value of the battery module from the expansion values of the battery modules of the plurality of battery modules; and determining the health state detection result of the battery pack to be detected according to the maximum expansion value of the module and the charging capacity of the battery pack to be detected.
In some embodiments, in the process of determining the health status detection result of the battery pack to be detected, the processing unit may be further specifically configured to obtain preset calibration information of the battery health status, and determine the health status detection result of the battery pack to be detected according to the calibration information of the battery health status, the maximum expansion value of the module, and the charging capacity. The battery health state calibration information comprises a plurality of battery health state calibration values, and a module maximum expansion force reference value and a battery pack reference charging capacity which correspond to each battery health state calibration value. The preset battery health status calibration information may be a curve, a table, a text, or index information, which is used to indicate a relationship among a battery health status calibration value, a module maximum expansion force reference value, and a battery pack reference charging capacity, and is not limited herein.
In some embodiments, the preset battery health state calibration information is a preset battery health state calibration three-dimensional curve, coordinates of each point on the curve correspond to a set of battery health state calibration value, a module maximum expansion force reference value and a battery pack reference charging capacity, and the corresponding battery health state calibration value is searched and matched on the battery health state calibration three-dimensional curve through a module maximum expansion force value and the charging capacity obtained by detecting the battery pack to be detected, and is used as a health state detection result of the battery pack to be detected.
And before the charging and discharging unit is controlled to charge the battery pack to be detected, the charging capacity detection unit is controlled to detect the charging capacity of the battery pack to be detected, and the health state detection result of the battery pack to be detected is determined according to the module expansion force value and the charging capacity of the battery pack to be detected, the processing unit can also be used for generating the calibration information of the health state of the battery. And for example, testing and SOH (state of health) calibration of the reference battery cell by using a battery pack state of health detection system, thereby generating the battery state of health calibration information.
Specifically, the pressure sensor may be further configured to set the preset pretightening force on the reference battery cell before the pressure sensor is set on the battery module in the battery pack to be tested with the preset pretightening force, and detect the cell expansion force reference value of the reference battery cell. Namely, the pressure sensor is used for installing and detecting the reference battery monomer by the same pretightening force loaded on the battery module in the battery pack to be detected.
In the process of generating the calibration information of the battery health state in advance, the processing unit may be specifically configured to control the charging and discharging unit to perform multiple cycles of discharging and charging the reference battery cell in sequence until the cell reference charging capacity of the reference battery cell is less than or equal to a preset end-of-life capacity; and in each cycle processing, controlling the charging capacity detection unit to detect a cell reference charging capacity of the reference battery cell and to acquire the cell expansion force reference value from the pressure sensor; respectively converting the monomer reference charging capacity and the monomer expansion force reference value obtained in each circulation treatment into a battery pack reference charging capacity and a module maximum expansion force reference value; setting a battery health state calibration value for the battery pack reference charging capacity and the module maximum expansion force reference value corresponding to each circulation processing; and taking the reference charging capacity of the battery pack, the maximum expansion force reference value of the module and the battery health state calibration value corresponding to each circulation processing as the calibration information of the battery health state.
The above conversion of the reference charging capacity of the battery pack can be understood that, since the capacity of the battery pack is affected by the parallel number of all the battery cells, the number of parallel branches in the battery pack to be tested needs to be obtained in advance. For example, in some embodiments, there are 100 battery cells in the battery pack to be tested, wherein every 50 battery cells are connected in series, and 2 groups of the battery cells connected in series are connected in parallel, so that the number of parallel connections formed is 2. If the cell reference charge capacity is 10Ah, then the battery pack reference charge capacity is 20Ah by 10Ah 2. Specifically, for example, the processing unit may be specifically configured to multiply the cell reference charging capacity obtained in each cycle processing by the parallel number of the battery cells included in the battery pack to be tested, so as to obtain the battery pack reference charging capacity corresponding to each cycle processing.
The conversion of the reference value of the maximum expansion force of the module can be understood as that a certain conversion relation exists between the expansion force of the single battery and the expansion force of the battery in the battery pack, and the conversion relation is calibrated through a calibration coefficient. For example, the processing unit may be specifically configured to multiply the monomer expansion force reference value obtained in each cyclic processing by the number of battery monomers included in each battery module in the battery pack to be tested and a preset calibration coefficient to obtain a module maximum expansion force reference value corresponding to each cyclic processing.
The processing unit may control the charging capacity detection unit to detect a cell reference charging capacity of the reference battery cell when the reference battery cell is fully charged in each cycle process, and acquire the cell expansion force reference value from the pressure sensor when the reference battery cell is fully charged.
In the above embodiment, the processing unit is configured to set the battery health status calibration value by referring to the charging capacity and the module maximum expansion force reference value for the battery pack corresponding to each cycle. For example, the battery pack reference charging capacity and the module maximum expansion force reference value corresponding to a plurality of cyclic processes may be set with the battery health status calibration value according to the order of the cyclic processes. It is understood that, when the cycling process is performed on the reference battery cell, the battery health status calibration value of the reference battery cell should be the highest, for example, set to 100%, and the battery health status calibration value of the reference battery cell should be gradually decreased with a plurality of executions of the cycling process until reaching the lowest, for example, the lowest battery health status calibration value is set to 80%, and the cycling process is stopped. The condition for stopping the circulation process, such as the above-described cell reference charge capacity of the reference battery cell, is less than or equal to the preset end-of-life capacity. And the end-of-life capacity may be up to 80% of the rated capacity of the reference cell, for example.
The battery pack health status detection system provided by the embodiment of the application comprises: the device comprises a pressure sensor, a charging and discharging unit, a charging capacity detection unit and a processing unit; the pressure sensor is arranged between the battery monomer and the end plate at two sides of the battery module in the battery pack to be detected according to a preset pretightening force, and is used for detecting the expansion force value of the battery module; the processing unit is connected with the pressure sensor, the charging and discharging unit and the charging capacity detection unit, and is used for controlling the charging and discharging unit to charge the battery pack to be detected, controlling the charging capacity detection unit to detect the charging capacity of the battery pack to be detected, and determining the health state detection result of the battery pack to be detected according to the module expansion force value and the charging capacity of the battery pack to be detected. According to the battery pack state of health detection method and device, on the basis of the charging capacity of the battery pack, the expansion force value of the module is introduced to carry out state of health detection on the battery pack, and the reliability of the state of health detection result of the battery pack to be detected is improved. The embodiment not only can simply, effectively and quickly obtain the health state detection result of the battery pack to be detected, but also can effectively reduce the safety risk of the battery pack to be detected.
On the basis of the above embodiment, the embodiment of the application further provides a battery pack health state detection method. Referring to fig. 2, a schematic flow chart of a method for detecting a state of health of a battery pack according to an embodiment of the present application is shown. The method shown in fig. 2 is applied to the processing unit in the battery pack state of health detection system shown in fig. 1. The battery pack state of health detection system includes: the device comprises a pressure sensor, a charging and discharging unit, a charging capacity detection unit and a processing unit. The pressure sensor is used for setting up between the battery monomer and the end plate of battery module both sides in the battery package that awaits measuring with preset pretightning force, and is right the module expansion force value of battery module detects. The method of fig. 2 includes steps S101 to S103, which are specifically as follows:
and S101, controlling the charging and discharging unit to charge the battery pack to be tested by the processing unit.
S102, the processing unit controls the charging capacity detection unit to detect the charging capacity of the battery pack to be detected.
And S103, determining the health state detection result of the battery pack to be detected by the processing unit according to the module expansion force value and the battery pack charging capacity.
The implementation principle and technical effect of each step in the method shown in fig. 2 are the same as those of the processing unit in the battery pack health status detection system in the embodiment shown in fig. 1, and are not described herein again.
In some embodiments, the charging capacity detecting unit, in response to the control of the processing unit, detects the electric quantity of the battery pack to be tested as the charging capacity of the battery pack to be tested when it is determined that the battery pack to be tested is continuously charged from zero electric quantity to full electric quantity.
In some embodiments, the battery pack to be tested includes a plurality of battery modules; and the module expansion force value is the expansion force value of each battery module detected by the pressure sensor when the battery pack to be detected is fully charged.
The processing unit determines a module maximum expansion force value from the module expansion force values of the plurality of battery modules; and determining the health state detection result of the battery pack to be detected according to the maximum expansion value of the module and the charging capacity of the battery pack to be detected.
In some embodiments, the processing unit further obtains preset battery health state calibration information, and determines a health state detection result of the battery pack to be detected according to the battery health state calibration information, the module maximum expansion value and the charging capacity; the battery health state calibration information comprises a plurality of battery health state calibration values, and a module maximum expansion force reference value and a battery pack reference charging capacity which correspond to each battery health state calibration value.
In some embodiments, the processing unit is further configured to generate the calibration information of the battery health state before controlling the charging and discharging unit to charge the battery pack to be tested, controlling the charging capacity detecting unit to detect the charging capacity of the battery pack to be tested, and determining the result of detecting the health state of the battery pack to be tested according to the module expansion force value and the charging capacity of the battery pack to be tested.
In some embodiments, the pressure sensor is further configured to be disposed on a reference battery cell with a preset pretightening force before being disposed between a battery cell and an end plate at two sides of a battery module in a battery pack to be tested with the preset pretightening force, and detect a cell expansion force reference value of the reference battery cell.
The processing unit controls the charging and discharging unit to sequentially perform a plurality of cyclic processing of discharging and charging on the reference battery monomer until the monomer reference charging capacity of the reference battery monomer is less than or equal to the preset end-of-life capacity; and in each cycle processing, controlling the charging capacity detection unit to detect a cell reference charging capacity of the reference battery cell and to acquire the cell expansion force reference value from the pressure sensor; respectively converting the monomer reference charging capacity and the monomer expansion force reference value obtained in each circulation treatment into a battery pack reference charging capacity and a module maximum expansion force reference value; setting a battery health state calibration value for the battery pack reference charging capacity and the module maximum expansion force reference value corresponding to each circulation processing; and taking the reference charging capacity of the battery pack, the maximum expansion force reference value of the module and the battery health state calibration value corresponding to each circulation processing as the calibration information of the battery health state.
In some embodiments, the processing unit multiplies the monomer reference charging capacity obtained in each cyclic processing by the number of parallel battery monomers in the battery pack to be tested, so as to obtain the battery pack reference charging capacity corresponding to each cyclic processing.
In some embodiments, the processing unit multiplies the monomer expansion force reference value obtained in each cyclic processing by the number of battery monomers included in each battery module in the battery pack to be tested and a preset calibration coefficient to obtain a module maximum expansion force reference value corresponding to each cyclic processing.
In some embodiments, the pre-load force has a value greater than or equal to 300 newtons and less than or equal to 5000 newtons.
Referring to fig. 3, which is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application, the electronic device 30 includes: a processor 31, a memory 32 and a computer program; wherein the content of the first and second substances,
a memory 32 for storing the computer program, which may also be a flash memory (flash). The computer program is, for example, an application program, a functional module, or the like that implements the above method.
A processor 31 for executing the computer program stored in the memory to implement the steps performed by the processing unit in the above method. Reference may be made in particular to the description relating to the preceding method embodiment.
Alternatively, the memory 32 may be separate or integrated with the processor 31.
When the memory 32 is a device independent of the processor 31, the electronic apparatus may further include:
a bus 33 for connecting the memory 32 and the processor 31.
The present application also provides a readable storage medium, in which a computer program is stored, which, when being executed by a processor, is adapted to implement the methods provided by the various embodiments described above.
The readable storage medium may be a computer storage medium or a communication medium. Communication media includes any medium that facilitates transfer of a computer program from one place to another. Computer storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, a readable storage medium is coupled to the processor such that the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Additionally, the ASIC may reside in user equipment. Of course, the processor and the readable storage medium may also reside as discrete components in a communication device. The readable storage medium may be a read-only memory (ROM), a random-access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
The present application also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the device may read the execution instructions from the readable storage medium, and the execution of the execution instructions by the at least one processor causes the device to implement the methods provided by the various embodiments described above.
In the above embodiments of the electronic device, it should be understood that the Processor may be a Central Processing Unit (CPU), other general-purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor, or in a combination of the hardware and software modules in the processor.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A battery pack state of health detection system, comprising: the device comprises a pressure sensor, a charging and discharging unit, a charging capacity detection unit and a processing unit;
the pressure sensor is used for being arranged on a battery module in the battery pack to be detected according to preset pretightening force and detecting the expansion force value of the battery module;
the processing unit is connected with the pressure sensor, the charging and discharging unit and the charging capacity detection unit, and is used for controlling the charging and discharging unit to charge the battery pack to be detected, controlling the charging capacity detection unit to detect the charging capacity of the battery pack to be detected, and determining the health state detection result of the battery pack to be detected according to the module expansion force value and the charging capacity of the battery pack to be detected.
2. The battery pack state of health detection system of claim 1,
and the charging capacity detection unit is used for responding to the control of the processing unit, detecting the electric quantity of the battery pack to be detected when the battery pack to be detected is determined to be continuously charged from zero electric quantity to full charge, and taking the electric quantity as the charging capacity of the battery pack to be detected.
3. The system for detecting the state of health of a battery pack according to claim 1, wherein the battery pack under test comprises a plurality of battery modules; the expansion force value of the battery module is the expansion force value of each battery module detected by the pressure sensor when the battery to be detected is fully charged;
the processing unit is specifically used for determining a maximum expansion force value of the module from the expansion force values of the plurality of battery modules; and determining the health state detection result of the battery pack to be detected according to the maximum expansion value of the module and the charging capacity of the battery pack to be detected.
4. The battery pack state of health detection system of claim 3,
the processing unit is further specifically configured to obtain preset battery health state calibration information, and determine a health state detection result of the battery pack to be detected according to the battery health state calibration information, the module maximum expansion value and the battery pack charging capacity; the battery health state calibration information comprises a plurality of battery health state calibration values, and a module maximum expansion force reference value and a battery pack reference charging capacity which correspond to each battery health state calibration value.
5. The battery pack state of health detection system of claim 4,
the processing unit is used for generating the calibration information of the health state of the battery before controlling the charging and discharging unit to charge the battery pack to be detected, controlling the charging capacity detection unit to detect the charging capacity of the battery pack to be detected, and determining the detection result of the health state of the battery pack to be detected according to the expansion value of the module and the charging capacity of the battery pack to be detected.
6. The battery pack state of health detection system of claim 5,
the pressure sensor is also used for being arranged on a reference battery monomer with a preset pretightening force before being arranged on a battery module in the battery pack to be detected with the preset pretightening force, and detecting a monomer expansion force reference value of the reference battery monomer;
the processing unit is specifically configured to control the charging and discharging unit to perform multiple cycles of discharging and charging the reference battery cell in sequence until the cell reference charging capacity of the reference battery cell is less than or equal to a preset end-of-life capacity; and in each cycle processing, controlling the charging capacity detection unit to detect a cell reference charging capacity of the reference battery cell and to acquire the cell expansion force reference value from the pressure sensor; respectively converting the monomer reference charging capacity and the monomer expansion force reference value obtained in each circulation treatment into a battery pack reference charging capacity and a module maximum expansion force reference value; setting a battery health state calibration value for the battery pack reference charging capacity and the module maximum expansion force reference value corresponding to each circulation processing; and taking the reference charging capacity of the battery pack, the maximum expansion force reference value of the module and the battery health state calibration value corresponding to each circulation processing as the calibration information of the battery health state.
7. The battery pack state of health detection system of claim 6,
the processing unit is specifically configured to multiply the monomer reference charging capacity obtained in each cyclic processing by the parallel number of the battery monomers in the battery pack to be tested, so as to obtain the battery pack reference charging capacity corresponding to each cyclic processing.
8. The battery pack state of health detection system of claim 6,
the processing unit is specifically configured to multiply the monomer expansion force reference value obtained in each cyclic processing by the number of battery monomers included in each battery module in the battery pack to be tested and a preset calibration coefficient to obtain a module maximum expansion force reference value corresponding to each cyclic processing.
9. The system of claim 1, wherein the pre-load force has a value greater than or equal to 300 newtons and less than or equal to 5000 newtons.
10. A battery pack state of health detection method, applied to a processing unit in the battery pack state of health detection system according to any one of claims 1 to 9, the method comprising:
and controlling the charging and discharging unit to charge the battery pack to be detected, controlling the charging capacity detection unit to detect the charging capacity of the battery pack to be detected, and determining the health state detection result of the battery pack to be detected according to the module expansion force value and the charging capacity of the battery pack.
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