CN115754780A

CN115754780A - Battery cell service life correction method and device, electronic equipment and storage medium

Info

Publication number: CN115754780A
Application number: CN202211426762.9A
Authority: CN
Inventors: 林辰耀
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-03-07

Abstract

The application relates to a method and a device for correcting the service life of a battery cell, electronic equipment and a storage medium, wherein the method comprises the steps of obtaining a historical SOH difference value and a historical cyclic SOH of the battery cell to be detected; obtaining the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH; acquiring charging parameter information of a battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH; when the corrected SOH and the current SOH meet a preset correction condition, processing the corrected SOH and the historical circulating SOH to obtain a current SOH difference value; the current cycle SOH is obtained, the corrected current SOH is obtained according to the current SOH difference value and the current cycle SOH, the cell service life SOH of the battery cell to be detected is corrected, experimental data such as calendar time cell service life data are not needed, the influence of temperature on capacity is considered in the process of correcting the SOH, and the reliability of cell service life SOH estimation can be greatly improved.

Description

Battery cell service life correction method and device, electronic equipment and storage medium

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a method and an apparatus for correcting a battery cell life, an electronic device, and a storage medium.

Background

The accurate estimation of the service life SOH of the battery core has important significance for the safe driving of the whole vehicle and is an important index for estimating the current total capacity of the power battery. The aging degree of the battery cell is accurately estimated, the spontaneous combustion of the whole vehicle can be effectively prevented, the maintenance and repair cost of the whole vehicle is controlled, and better vehicle using experience is provided for users.

In the existing accurate estimation mode of the cell life SOH, cell experimental data such as cycle number cell life data and calendar time cell life data, particularly calendar time cell life data, are relied on, and the experimental time cost is high; in addition, the whole vehicle working condition is complicated, the influence on the service life of the battery cell can be caused to the working conditions of overcharge, overdischarge, extreme temperature, instantaneous large current and the like, the SOH of the service life of the battery cell is estimated only through the experimental data of the battery cell, and the complicated working condition of the whole vehicle is difficult to adapt to.

Disclosure of Invention

In view of the above, it is necessary to provide a battery cell life correction method and apparatus, an electronic device, and a storage medium, which can correct the cell life SOH and improve the reliability of the estimation of the cell life SOH, in view of the above-described problems in the conventional method for estimating the cell life SOH.

In a first aspect, the present application provides a method for correcting a lifetime of a battery cell, including the following steps:

acquiring a historical SOH difference value and a historical cyclic SOH of a battery cell to be tested;

obtaining the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH;

acquiring charging parameter information of a battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH;

when the corrected SOH and the current SOH meet a preset correction condition, processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference value;

and acquiring the current cycle SOH, and obtaining the corrected current SOH according to the current SOH difference and the current cycle SOH.

Optionally, the step of obtaining the charging parameter information of the battery cell to be tested in the charging state, and processing the charging parameter information based on a preset correction algorithm to obtain the corrected SOH includes:

acquiring the current SOC of a battery cell to be tested in a charging state, confirming the current SOC as an initial SOC when the current SOC meets a first preset condition, and confirming the current SOC as an end SOC when the current SOC meets a second preset condition;

obtaining the charging capacity according to the starting SOC and the ending SOC;

acquiring the total capacity of a battery cell to be tested and the current cell average temperature of a corresponding finished SOC, and acquiring a temperature capacity coefficient according to the current cell average temperature;

and obtaining the corrected SOH corresponding to the battery cell to be tested according to the total capacity, the initial SOC, the ending SOC, the charging capacity and the temperature capacity coefficient.

Optionally, when the current SOC satisfies the first preset condition, the step of determining the current SOC as the starting SOC includes:

acquiring the dormancy time of a battery cell to be tested;

performing OCV correction processing on the current SOC to obtain a corrected current SOC;

and when the sleep time is greater than a first preset threshold and the corrected current SOC is less than a second preset threshold, determining the corrected current SOC as the starting SOC.

Optionally, when the current SOC satisfies the second preset condition, the step of determining the current SOC as the end SOC includes:

when the current SOC is greater than or equal to a third preset threshold value, determining the current SOC as an end SOC; the third preset threshold is greater than the second preset threshold.

Optionally, the step of obtaining the corrected SOH of the corresponding battery cell to be tested according to the total capacity, the initial SOC, the end SOC, the charge capacity, and the temperature capacity coefficient includes:

carrying out difference processing on the ending SOC and the starting SOC to obtain an SOC difference;

performing product processing on the SOC difference value, the total capacity and the temperature capacity coefficient to obtain an intermediate numerical value;

and dividing the charging capacity and the intermediate value by taking the charging capacity as a dividend to obtain the corrected SOH.

Optionally, when the corrected SOH and the current SOH satisfy a preset correction condition, the step of processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference includes:

when the corrected SOH is smaller than the current SOH, the difference value between the corrected SOH and the current SOH is larger than a fourth preset threshold value, and the difference value between the corrected SOH and the current SOH is smaller than a fifth preset threshold value, processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference value; the fourth preset threshold is smaller than the fifth preset threshold.

Optionally, in the step of correcting that the difference between the SOH and the current SOH is smaller than a fifth preset threshold, the step of obtaining the fifth preset threshold includes:

and according to the sleep time, looking up a table to obtain a threshold upper limit difference value corresponding to the sleep time, and determining the threshold upper limit difference value as a fifth preset threshold.

In a second aspect, the present application provides a battery cell life correction apparatus, including;

the history SOH acquisition unit is used for acquiring a history SOH difference value and a history cyclic SOH of the battery cell to be tested;

the current SOH obtaining unit is used for obtaining the current SOH corresponding to the battery cell to be tested according to the historical SOH difference value and the historical cyclic SOH;

the correction SOH acquisition unit is used for acquiring the charging parameter information of the battery cell to be detected in the charging state and processing the charging parameter information based on a preset correction algorithm to obtain a correction SOH;

the SOH difference processing unit is used for processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference when the corrected SOH and the current SOH meet a preset correction condition;

and the SOH correction unit is used for acquiring the current cycle SOH and obtaining the corrected current SOH according to the current SOH difference and the current cycle SOH.

In a third aspect, the present application provides an electronic device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps of any one of the above methods for correcting the service life of a battery cell when executing the computer program.

In a fourth aspect, the present application provides a computer storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of any one of the above battery cell life correction methods.

One of the above technical solutions has the following advantages and beneficial effects:

in the method for correcting the service life of the battery cell, the historical SOH difference value and the historical cyclic SOH of the battery cell to be detected are obtained; obtaining the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH; acquiring charging parameter information of a battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH; when the corrected SOH and the current SOH meet a preset correction condition, processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference value; the current cycle SOH is acquired, the corrected current SOH is acquired according to the current SOH difference value and the current cycle SOH, and then the cell service life SOH of the battery cell to be detected is corrected.

Drawings

Fig. 1 is a schematic view of an application scenario of a battery cell life correction method in an embodiment of the present application;

fig. 2 is a first flowchart of a battery cell life correction method in the embodiment of the present application;

FIG. 3 is a flow chart illustrating the processing steps for correcting SOH in the embodiment of the present application;

FIG. 4 is a flowchart illustrating the processing steps of initiating SOC in an embodiment of the present application;

FIG. 5 is a flowchart illustrating the calculation steps for correcting SOH in the embodiment of the present application;

fig. 6 is a second flowchart of a battery cell life correction method in the embodiment of the present application;

fig. 7 is a schematic structural diagram of a battery cell life correction apparatus in an embodiment of the present application;

fig. 8 is a schematic structural diagram of an electronic device in an embodiment of the present application.

Detailed Description

In order to make the technical solutions of the present application better understood by those skilled in the art, 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 some embodiments of the present application, and not all 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 noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," 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.

In addition, the term "plurality" shall mean two as well as more than two.

The method for correcting the service life of the battery cell can be applied to an application environment shown in fig. 1. The processing device may include a processor 102 and a memory 104, and the memory 104 may be used to store historical SOH (State of Health) difference values, historical cycle SOH, and current SOH difference values. The processor 102 may be configured to obtain a historical SOH difference and a historical cyclic SOH of the battery cell to be tested; obtaining the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH; acquiring charging parameter information of a battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH; when the corrected SOH meets a preset correction condition, processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference value; and acquiring the current cycle SOH, and obtaining the corrected current SOH according to the current SOH difference and the current cycle SOH. The processing device may also include a display 106, and the display 106 may display data such as historical SOH differences, historical cyclic SOH differences, and current SOH differences via a graphical interface. In one example, the processing device may be, but is not limited to, a vehicle computer, a desktop computer, a notebook computer, or a tablet computer.

The method aims to solve the problems existing in the conventional method for estimating the service life SOH of the battery core. In an embodiment, as shown in fig. 2, a method for correcting a lifetime of a battery cell is provided, which is described by taking the method as an example applied to the processor 102 in fig. 1, and includes the following steps:

step S210, obtaining a historical SOH difference value and a historical cyclic SOH of the battery cell to be tested.

The battery cell to be tested may be, but is not limited to, a three-element battery cell. The historical SOH difference is the difference between the historical corrected SOH and the historical cyclic SOH. The historical corrected SOH may be a corrected SOH resulting from a previous correction, and the historical SOH difference is stored as a SOH difference last stored in the memory. And recording the accumulated charging ampere hours in the last correction process by an ampere hour accumulated recording method, and calculating the cycle number to further obtain the historical cycle SOH. The cumulative charging ampere-hour during the last correction may be stored in the memory.

The processor can obtain the historical SOH difference value of the corresponding battery cell to be tested in a mode of reading the memory. The processor can also obtain the historical cycle SOH corresponding to the battery cell to be tested by reading the accumulated charging ampere-hour in the last correction process in the memory and further calculating the corresponding cycle times.

And step S220, obtaining the current SOH corresponding to the battery cell to be tested according to the historical SOH difference value and the historical cyclic SOH.

Illustratively, according to the obtained historical SOH difference and the historical cyclic SOH, difference processing is performed on the historical cyclic SOH and the historical SOH difference, so as to obtain the current SOH corresponding to the battery cell to be tested. The current SOH is used to indicate the current cell life of the battery cell to be tested.

Step S230, obtaining charging parameter information of the battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH.

The charging parameter information may include a total battery cell capacity, an SOC, a charging capacity, and a temperature capacity coefficient of the battery cell to be tested in a charging state. Correcting the SOH refers to correcting the service life parameters of the battery cell to be tested.

When the battery cell to be tested starts to charge, the charging state of the battery cell to be tested can be monitored in real time, and then the charging parameter information is obtained. And processing the charging parameter information such as the total capacity, SOC, charging capacity, temperature capacity coefficient and the like of the battery cell based on a preset correction algorithm, and further obtaining the corrected SOH.

And step S240, when the corrected SOH and the current SOH meet the preset correction condition, processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference value.

For example, the processor may compare the corrected SOH with the current SOH, determine that the corrected SOH is valid when the corrected SOH and the current SOH satisfy a preset correction condition, and perform difference processing on the corrected SOH and the historical cyclic SOH to obtain a current SOH difference.

In one example, the current SOH difference may be stored in memory and may be used for the next parameter input for battery cell life correction.

And step S250, acquiring the current cycle SOH, and obtaining the corrected current SOH according to the current SOH difference and the current cycle SOH.

And recording the accumulated charging ampere hours in the current correction process by an ampere hour accumulated recording method, and calculating the cycle number to further obtain the current cycle SOH. Further, the cumulative number of charging amps during the current correction may be stored in memory.

For example, the processor records the accumulated charging ampere hours by an ampere-hour accumulated recording method in the current charging state of the battery cell to be tested, and then obtains the current cycle SOH corresponding to the battery cell to be tested by calculating the corresponding cycle number.

And the processor performs difference processing on the current SOH difference and the current cycle SOH according to the current SOH difference and the current cycle SOH so as to obtain the corrected current SOH.

In one example, when the corrected SOH and the current SOH do not satisfy the preset correction condition, the cycle SOH may be calculated by looking up a table of cycle number cell life data, and the cycle SOH may be used as the current cell life SOH.

In the above embodiment, the historical SOH difference and the historical cyclic SOH of the battery cell to be tested are obtained; obtaining the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH; acquiring charging parameter information of a battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH; when the corrected SOH and the current SOH meet a preset correction condition, processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference value; the current cycle SOH is acquired, the corrected current SOH is acquired according to the current SOH difference value and the current cycle SOH, and then the cell service life SOH of the battery cell to be detected is corrected.

In one example, as shown in fig. 3, the step of obtaining the charging parameter information of the battery cell to be tested in the charging state, and processing the charging parameter information based on a preset correction algorithm to obtain the corrected SOH includes:

step S310, obtaining a current SOC (State Of Charge) Of the battery cell to be tested in a charging State, determining the current SOC as a starting SOC when the current SOC meets a first preset condition, and determining the current SOC as an ending SOC when the current SOC meets a second preset condition.

When the battery cell to be tested starts to charge, the processor can monitor the charging state of the battery cell to be tested in real time, and then the current SOC is obtained. The processor judges whether the current SOC meets a first preset condition or not, and confirms the current SOC as an initial SOC when the current SOC meets the first preset condition. The processor also judges whether the current SOC meets a second preset condition, and confirms the current SOC as the ending SOC when the current SOC meets the second preset condition.

Step S320, obtaining the charging capacity according to the starting SOC and the ending SOC.

For example, in the charging process of the battery cell to be tested, the charging capacity from the initial SOC to the end SOC can be recorded through ampere-hour accumulation, so as to obtain the charging capacity of the corresponding battery cell to be tested.

Step S330, acquiring the total capacity of the battery cell to be tested and the current average cell temperature of the corresponding finished SOC, and obtaining a temperature capacity coefficient according to the current average cell temperature.

The total capacity of the battery cell to be tested can be obtained according to a cell experiment, and the total capacity of the battery cell to be tested can be the total capacity of the battery cell at normal temperature (for example, 25 ℃).

For example, different temperatures of the battery cell to be tested and temperature capacity coefficients corresponding to the different temperatures can be obtained according to the cell experiment; the temperature capacity coefficient can be processed by interpolation fitting according to the cell temperature to obtain a corresponding cell temperature capacity coefficient. And establishing a battery core temperature capacity coefficient table (shown in the following table) according to different temperatures and temperature capacity coefficients corresponding to the different temperatures. And the processor can further obtain the current average temperature of the battery cell corresponding to the finished SOC, and query the battery cell temperature capacity coefficient table according to the current average temperature of the battery cell to obtain the temperature capacity coefficient corresponding to the current average temperature of the battery cell.

Temperature (. Degree. C.)	Temperature capacity coefficient (%)
		-25	75
-15	83
		-5	89
0	92
		10	96
25	100
		45	105

And step S340, obtaining the corrected SOH corresponding to the battery cell to be tested according to the total capacity, the initial SOC, the ending SOC, the charging capacity and the temperature capacity coefficient.

For example, a corresponding correction model may be established according to a preset correction algorithm, and the total capacity, the starting SOC, the ending SOC, the charging capacity, and the temperature capacity coefficient may be input into the correction model, so that the correction model outputs a corrected SOH corresponding to the battery cell to be tested.

In the embodiment, in the process of correcting the service life SOH of the battery cell, the battery cell service life SOH does not need to depend on experimental data such as calendar time cell service life data, and meanwhile, the influence of temperature on capacity is considered in the process of correcting the SOH, so that the reliability of estimating the service life SOH of the battery cell can be greatly improved.

In one example, as shown in fig. 4, the step of confirming the current SOC as the starting SOC when the current SOC satisfies the first preset condition includes:

and S410, acquiring the dormancy time of the battery cell to be tested.

When the battery cell to be tested starts to be charged, the dormancy time of the battery cell to be tested can be obtained in advance, and then the dormancy time of the corresponding battery cell to be tested is obtained.

Step S420, OCV correction processing is performed on the current SOC to obtain the corrected current SOC.

The OCV (Open circuit voltage) refers to a potential difference between the two electrodes when the battery is Open-circuited without discharging.

For example, according to the current SOC, the current open-circuit voltage corresponding to the current SOC may be obtained. And inquiring a pre-established SOC-OCV table to further obtain the SOC corresponding to the current open-circuit voltage, and determining the SOC as the corrected current SOC.

Step S430, when the sleep time is greater than the first preset threshold and the modified current SOC is less than the second preset threshold, determining the modified current SOC as the starting SOC.

The first preset threshold and the second preset threshold can be obtained according to system presetting.

For example, the first preset threshold may be set to 1 hour, the second preset threshold may be set to 20%, and the processor compares the obtained sleep time with the first preset threshold, compares the modified current SOC with the second threshold, and determines the modified current SOC as the starting SOC if the sleep time is greater than 1 hour and the modified current SOC is less than 20%.

In one example, the step of confirming the current SOC as the end SOC when the current SOC satisfies the second preset condition includes:

The third preset threshold value can be obtained according to system preset. The third preset threshold is greater than the second preset threshold, for example, the third preset threshold may be set to 90%.

For example, in the charging process of the battery cell to be tested, the processor may monitor the current SOC of the battery cell to be tested in real time, and when the current SOC is greater than or equal to 90%, the charging state of the battery cell to be tested reaches the charging end, and the current SOC is determined as the end SOC.

In one example, as shown in fig. 5, the step of obtaining the corrected SOH corresponding to the battery cell to be tested according to the total capacity, the starting SOC, the ending SOC, the charging capacity and the temperature capacity coefficient includes:

and step S510, carrying out difference processing on the end SOC and the initial SOC to obtain an SOC difference.

And subtracting the initial SOC from the ending SOC to obtain an SOC difference value.

Step S520, a product of the SOC difference, the total capacity, and the temperature capacity coefficient is processed to obtain an intermediate value.

In step S530, the charging capacity is used as dividend, and the charging capacity and the intermediate value are divided to obtain the corrected SOH.

Setting the initial SOC as SOC1, the end SOC as SOC2, the total capacity as C1, the charging capacity as C2, the temperature capacity coefficient as K, and the corrected SOH as SOH1. The formula for the corrected SOH is:

and inputting the obtained total capacity, initial SOC, end SOC, charging capacity and temperature capacity coefficient into the calculation formula to further obtain the corrected SOH.

In an embodiment, as shown in fig. 6, a method for correcting a lifetime of a battery cell is provided, which is described by taking the method as an example applied to the processor 102 in fig. 1, and includes the following steps:

step S610, obtaining a historical SOH difference value and a historical cyclic SOH of the battery cell to be tested.

For the detailed description of the step S610, please refer to the description of the above embodiments, which is not repeated herein.

And S620, obtaining the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH.

For the detailed description of the step S620, please refer to the description of the above embodiments, which is not repeated herein.

Step S630, acquiring the charging parameter information of the battery cell to be tested in the charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH.

For the detailed description of the step S630, reference is made to the description of the above embodiments, which is not repeated herein.

Step 640, when the corrected SOH is smaller than the current SOH, the difference between the corrected SOH and the current SOH is larger than a fourth preset threshold, and the difference between the corrected SOH and the current SOH is smaller than a fifth preset threshold, processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference; the fourth preset threshold is smaller than the fifth preset threshold.

The fourth preset threshold and the fifth preset threshold can be obtained according to system presetting. For example, the fourth preset threshold may be set to 0.5%. The fifth preset threshold corresponds to the sleep time of the battery cell to be tested.

In one example, in step S640, the acquiring step of the fifth preset threshold includes:

and according to the sleep time, obtaining a threshold upper limit difference value corresponding to the sleep time by table lookup, and determining the threshold upper limit difference value as a fifth preset threshold.

For example, a sleep time and upper threshold corresponding table (shown in the following table) may be queried according to the sleep time of the battery electric core to be tested, so as to obtain a corresponding fifth preset threshold.

Sleep time (sky)	Difference (%)
		0	2％
30	2％
		100	4％
300	7％
		600	10％
>600	10％

And comparing the corrected SOH with the current SOH, ensuring that the corrected SOH is monotonically decreased when the corrected SOH is smaller than the current SOH, judging that the corrected SOH is an effective corrected SOH when the difference between the corrected SOH and the current SOH is larger than a fourth preset threshold and the difference between the corrected SOH and the current SOH is smaller than a fifth preset threshold, and further performing difference processing on the corrected SOH and the historical circulating SOH to obtain the difference of the current SOH.

And step S650, acquiring the current cycle SOH, and obtaining the corrected current SOH according to the current SOH difference and the current cycle SOH.

For the detailed description of the step S650, please refer to the description of the above embodiments, which is not repeated herein.

In the above embodiment, in the process of correcting the service life SOH of the battery cell, the battery cell service life SOH does not need to depend on experimental data such as calendar time cell service life data, and the influence of temperature on capacity is considered in the process of correcting the SOH, so that the service life SOH of the battery cell to be detected is corrected, and meanwhile, the reliability of estimating the service life SOH of the battery cell can be greatly improved.

It should be understood that although the various steps in the flow diagrams of fig. 2-6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-6 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.

In one embodiment, as shown in fig. 7, the present application provides a battery cell life correction apparatus, including;

and a historical SOH obtaining unit 710, configured to obtain a historical SOH difference and a historical cyclic SOH of the battery cell to be tested.

And the current SOH obtaining unit 720 is configured to obtain the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH.

The corrected SOH obtaining unit 730 is configured to obtain charging parameter information of the battery cell to be tested in a charging state, and process the charging parameter information based on a preset correction algorithm to obtain a corrected SOH.

And the SOH difference processing unit 740 is configured to, when the corrected SOH and the current SOH meet a preset correction condition, process the corrected SOH and the historical cyclic SOH to obtain a current SOH difference.

And an SOH correction unit 750 configured to obtain the current cycle SOH, and obtain a corrected current SOH according to the current SOH difference and the current cycle SOH.

For specific limitations of the battery cell life correction device, reference may be made to the above limitations of the battery cell life correction method, and details are not described here. Each module in the battery cell life correction apparatus may be wholly or partially implemented by software, hardware, or a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the electronic device, or can be stored in a memory in the electronic device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, an electronic device is provided. The internal structure of the electronic device may be as shown in fig. 8. The electronic device comprises a processor and a memory which are connected through a system bus; the electronic device may also include a network interface and an input device. Wherein the processor is configured to provide computational and control capabilities. The memory comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a battery cell life correction method.

It will be understood by those skilled in the art that the structure shown in fig. 8 is a block diagram of only a portion of the structure related to the present application, and does not constitute a limitation on the electronic device to which the present application is applied, and a particular electronic device may include more or less components than those shown in the drawings, or combine certain components, or have a different arrangement of components.

In an embodiment, an electronic device is provided, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of any one of the above battery cell life correction methods when executing the computer program.

Illustratively, the processor, when executing the computer program, may implement the following steps of the battery cell life correction method:

obtaining a historical SOH difference value and a historical cyclic SOH of a battery cell to be tested; obtaining the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH; acquiring charging parameter information of a battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH; when the corrected SOH and the current SOH meet a preset correction condition, processing the corrected SOH and the historical circulating SOH to obtain a current SOH difference value; and acquiring the current cycle SOH, and acquiring the corrected current SOH according to the current SOH difference and the current cycle SOH, so as to correct the SOH of the service life of the battery cell to be detected.

In one embodiment, the present application provides a computer storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the steps of the battery cell life correction method of any of the above.

Obtaining a historical SOH difference value and a historical cyclic SOH of a battery cell to be tested; obtaining the current SOH of the corresponding battery cell to be tested according to the historical SOH difference and the historical cyclic SOH; acquiring charging parameter information of a battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH; when the corrected SOH and the current SOH meet a preset correction condition, processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference value; and obtaining the current cycle SOH, and obtaining the corrected current SOH according to the current SOH difference value and the current cycle SOH, so as to realize the SOH correction of the service life of the battery cell to be detected.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the division methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct Rambus Dynamic RAM (DRDRAM), and Rambus Dynamic RAM (RDRAM), among others.

All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A battery cell life correction method is characterized by comprising the following steps:

obtaining the current SOH corresponding to the battery cell to be tested according to the historical SOH difference and the historical cyclic SOH;

acquiring charging parameter information of the battery cell to be tested in a charging state, and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH;

and acquiring the current cycle SOH, and acquiring the corrected current SOH according to the current SOH difference and the current cycle SOH.

2. The method according to claim 1, wherein the step of obtaining charge parameter information of the battery cell to be tested in a charged state and processing the charge parameter information based on a preset correction algorithm to obtain a corrected SOH includes:

acquiring the current SOC of a battery cell to be tested in a charging state, confirming the current SOC as a starting SOC when the current SOC meets a first preset condition, and confirming the current SOC as an ending SOC when the current SOC meets a second preset condition;

obtaining a charging capacity according to the starting SOC and the ending SOC;

acquiring the total capacity of the battery cell to be tested and the current cell average temperature corresponding to the finished SOC, and acquiring a temperature capacity coefficient according to the current cell average temperature;

and obtaining a corrected SOH corresponding to the battery cell to be tested according to the total capacity, the initial SOC, the ending SOC, the charging capacity and the temperature capacity coefficient.

3. The method of claim 2, wherein the step of determining the current SOC as a starting SOC when the current SOC satisfies a first preset condition includes:

acquiring the dormancy time of the battery cell to be tested;

4. The battery cell life correction method according to claim 3, wherein the step of confirming the current SOC as an end SOC when the current SOC satisfies a second preset condition includes:

when the current SOC is larger than or equal to a third preset threshold value, determining the current SOC as an end SOC; the third preset threshold is greater than the second preset threshold.

5. The method of any of claims 2 to 4, wherein the step of obtaining a corrected SOH corresponding to the battery cell to be tested according to the total capacity, the start SOC, the end SOC, the charge capacity, and the temperature capacity coefficient includes:

performing product processing on the SOC difference value, the total capacity and the temperature capacity coefficient to obtain an intermediate value;

6. The battery cell life correction method of claim 3, wherein the step of processing the corrected SOH and the historical cyclic SOH to obtain a current SOH difference when the corrected SOH and the current SOH satisfy a preset correction condition includes:

when the corrected SOH is smaller than the current SOH, the difference value between the corrected SOH and the current SOH is larger than a fourth preset threshold value, and the difference value between the corrected SOH and the current SOH is smaller than a fifth preset threshold value, processing the corrected SOH and the historical cyclic SOH to obtain the difference value of the current SOH; the fourth preset threshold is smaller than the fifth preset threshold.

7. The battery cell life correction method according to claim 6, wherein in the step of determining that the difference between the corrected SOH and the current SOH is smaller than a fifth preset threshold, the step of obtaining the fifth preset threshold includes:

and according to the dormancy time, looking up a table to obtain a threshold upper limit difference value corresponding to the dormancy time, and confirming the threshold upper limit difference value as the fifth preset threshold.

8. A battery cell life correction apparatus, comprising:

the historical SOH acquisition unit is used for acquiring a historical SOH difference value and a historical cyclic SOH of the battery cell to be tested;

the system comprises a corrected SOH acquisition unit, a correction algorithm acquisition unit and a correction SOH processing unit, wherein the corrected SOH acquisition unit is used for acquiring charging parameter information of a battery cell to be detected in a charging state and processing the charging parameter information based on a preset correction algorithm to obtain a corrected SOH;

9. An electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the battery cell life correction method according to any one of claims 1 to 7 when executing the computer program.

10. A computer storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the battery cell life correction method of any of claims 1 to 7.