Nickel sheet internal resistance dynamic compensation method and system for improving lithium battery capacity, computer readable storage medium and computer program product

Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a nickel sheet internal resistance dynamic compensation method and system for improving the capacity of a lithium battery, a computer readable storage medium and a computer program product. The method comprises the following steps: monitoring the working state of a battery pack in real time through an AFE chip, and collecting the working current of the battery pack and the current battery voltage of each lithium battery; when the battery pack is in a charging / discharging state, respectively calculating the compensation voltage of each lithium battery according to the collected working current and the pre-detected internal resistance of a connecting nickel sheet of each lithium battery of the battery pack; and performing voltage compensation on each lithium battery according to the compensation voltage of each lithium battery to obtain the real voltage of each lithium battery. According to the invention, voltage compensation is correspondingly carried out on the collected battery voltage of the lithium battery through the change of the following current and the internal resistance of the connecting nickel sheet, so that an extra voltage value brought by the connecting nickel sheet is eliminated, the voltage collection precision of the lithium battery is improved, and the wooden barrel short plate effect of the lithium battery is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium ion batteries, in particular to a nickel sheet internal resistance dynamic compensation method and system for improving the capacity of lithium batteries, a computer readable storage medium and a computer program product. BACKGROUND

[0002] The existing lithium battery voltage acquisition often ignores the internal resistance difference caused by the nickel sheet structure, and usually only static voltage calibration is performed, but this only calibrates the sampling error of the AFE (Analog Front End) chip, rather than the voltage of the lithium battery itself. Because of the existence of the connecting nickel sheet, the voltage acquisition line of the AFE chip is generally connected to the connecting nickel sheet, rather than the positive and negative tabs of the lithium battery itself. There is a connecting nickel sheet between the positive and negative tabs of the lithium battery and the voltage acquisition line, and the longer the distance, the greater the internal resistance generated. In the dynamic process of charging / discharging, the greater the current, the greater the voltage difference generated. Due to the design of various structures, it is impossible to design the connecting nickel sheet to be equal in length, and the lithium battery cell voltage acquisition point cannot be connected to the positive and negative tabs of the lithium battery itself, which means that some sections will inevitably introduce the internal resistance of the connecting nickel sheet, resulting in that the actual voltage collected by the AFE chip is the true battery voltage + the voltage of the connecting nickel sheet internal resistance.

[0003] As known, when lithium batteries are connected in series and parallel to form a battery pack, the lithium batteries themselves already have differences in internal resistance, so the lithium batteries will be strictly matched before being connected to reduce the internal resistance difference, thereby reducing the wood barrel short board effect. However, due to the existence of the connecting nickel sheet structure, unnecessary additional connecting nickel sheet internal resistance difference is introduced, which is superimposed on the lithium battery, increases the additional internal resistance difference of the lithium battery, causes the battery voltage collected by the AFE chip to deviate from the true battery voltage, and causes the pressure difference of the whole lithium battery group to become large, which virtually amplifies the wood barrel short board effect of the lithium battery group, thereby greatly reducing the endurance and cycle life of the lithium battery. SUMMARY

[0004] The present application aims to provide a nickel sheet internal resistance dynamic compensation method and system for improving the capacity of lithium batteries, a computer readable storage medium and a computer program product, to solve or at least partially solve the technical problems mentioned in the background.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a nickel sheet internal resistance dynamic compensation method for improving the capacity of lithium batteries, comprising:

[0007] monitoring the working state of the battery pack in real time by the AFE chip, and collecting the working current of the battery pack and the current battery voltage of each lithium battery;

[0008] When the battery pack is in the charging / discharging state, the compensation voltage of each lithium battery is calculated according to the collected working current and the detected internal resistance of the connecting nickel sheet of each lithium battery of the battery pack;

[0009] The voltage of each lithium battery is compensated according to the compensation voltage of each lithium battery, and the real voltage of each lithium battery is obtained.

[0010] The compensation voltage of the single lithium battery is calculated by the working current of the battery pack * the internal resistance of the connecting nickel sheet of the single lithium battery.

[0011] Optionally, before the AFE chip is used to monitor the working state of the battery pack in real time, and the working current of the battery pack and the current battery voltage of each lithium battery are collected, the method further comprises:

[0012] The internal resistance of the connecting nickel sheet of each lithium battery of the battery pack is detected.

[0013] Each voltage sampling point of the battery pack is electrically connected to each voltage collection line of the AFE chip in one-to-one correspondence.

[0014] Each lithium battery has one voltage sampling point on the positive / negative electrode lug side.

[0015] Optionally, after the AFE chip is used to monitor the working state of the battery pack in real time, and the working current of the battery pack and the current battery voltage of each lithium battery are collected, the method further comprises:

[0016] When the battery pack is in the static state, the collected battery voltage is not compensated, and the collected current battery voltage of each lithium battery is regarded as the real voltage of each lithium battery.

[0017] Optionally, the voltage of each lithium battery is compensated according to the compensation voltage of each lithium battery, and the real voltage of each lithium battery is obtained, which specifically comprises:

[0018] When the battery pack is in the charging state, the voltage compensation is negative compensation, and the calculation formula of the real voltage of the lithium battery is:

[0019] V cell = V afe -R nic *I chg ;

[0020] When the battery pack is in the discharging state, the voltage compensation is positive compensation, and the calculation formula of the real voltage of the lithium battery is:

[0021] V cell = V afe +R nic *Idsg ;

[0022] wherein, V cell is the real voltage of the lithium battery, V afe is the battery voltage collected by the AFE chip, R nic is the internal resistance of the connecting nickel sheet of the lithium battery, I chg is the charging current of the lithium battery collected by the AFE chip, I dsg is the discharging current of the lithium battery collected by the AFE chip.

[0023] In a second aspect, the present application provides a nickel sheet internal resistance dynamic compensation system for improving the capacity of a lithium battery, comprising: an MCU and an AFE chip;

[0024] The AFE chip is used to monitor the working state of the battery pack in real time, and collect the working current of the battery pack and the current battery voltage of each lithium battery; wherein each voltage sampling point of the battery pack is electrically connected to each voltage collection line of the AFE chip in one-to-one correspondence.

[0025] The MCU is electrically connected to the AFE chip, and is used to calculate the compensation voltage of each lithium battery according to the collected working current and the internal resistance of the connecting nickel sheet of each lithium battery of the battery pack detected in advance when the battery pack is in the charging / discharging state; and is also used to perform voltage compensation on each lithium battery according to the compensation voltage of each lithium battery to obtain the real voltage of each lithium battery.

[0026] The compensation voltage of a single lithium battery is calculated by the product of the working current of the battery pack and the internal resistance of the connecting nickel sheet of the single lithium battery.

[0027] Optionally, the nickel sheet internal resistance dynamic compensation system further comprises an internal resistance tester for detecting the internal resistance of the connecting nickel sheet of each lithium battery of the battery pack.

[0028] The MCU is electrically connected to the internal resistance tester.

[0029] Optionally, the MCU is further used to:

[0030] When the battery pack is in a static state, the collected battery voltage is not subjected to voltage compensation, and the collected current battery voltage of each lithium battery is regarded as the real voltage of each lithium battery.

[0031] Optionally, the voltage compensation on each lithium battery according to the compensation voltage of each lithium battery to obtain the real voltage of each lithium battery specifically comprises:

[0032] When the battery pack is in a charging state, the voltage compensation is negative compensation, and the calculation formula of the real voltage of the lithium battery is:

[0033] Vcell = V afe - R nic * I chg

[0034] When the battery pack is in the discharging state, the voltage compensation is positive compensation, and the calculation formula of the real voltage of the lithium battery is:

[0035] V cell = V afe + R nic * I dsg

[0036] Wherein, V cell is the real voltage of the lithium battery, V afe is the battery voltage collected by the AFE chip, R nic is the internal resistance of the connected nickel sheet of the lithium battery, I chg is the charging current of the lithium battery collected by the AFE chip, and I dsg is the discharging current of the lithium battery collected by the AFE chip.

[0037] In a third aspect, the application also provides a computer readable storage medium, and the storage medium stores at least one instruction, and the instruction is loaded and executed by a processor to realize the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery.

[0038] In a fourth aspect, the application also provides a computer program product, which comprises a computer program / instruction, and when the computer program / instruction is executed by a processor, the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery is realized.

[0039] Compared with the prior art, the application has the following beneficial effects:

[0040] The nickel sheet internal resistance dynamic compensation system for improving the capacity of the lithium battery provided in the application, when the battery pack is in the charging / discharging state, the battery voltage collected by the AFE chip is given to the MCU to calculate the compensation, and when the MCU calculates the compensation, the collected battery voltage of the lithium battery is compensated by following the change of the current and the internal resistance of the connected nickel sheet, so as to eliminate the additional voltage value caused by the connected nickel sheet, improve the voltage collection accuracy of the lithium battery, reduce the barrel short board effect of the lithium battery, help to improve the capacity, endurance time and cycle life of the lithium battery, and maximize the performance of the lithium battery. BRIEF DESCRIPTION OF DRAWINGS

[0041] ​​In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0042] Figure 1 A flowchart of a nickel sheet internal resistance dynamic compensation method for improving the capacity of a lithium battery is provided for the embodiments of the present application.

[0043] Figure 2 An internal connection structure diagram of a battery pack is provided for the embodiments of the present application.

[0044] Figure 3 A battery voltage schematic diagram collected in the battery pack of the present application is provided. Figure 2 A battery voltage schematic diagram collected in the battery pack of the present application is provided.

[0045] Figure 4 A battery voltage schematic diagram collected in the battery pack of the present application is provided. Figure 2 A battery voltage schematic diagram collected in the battery pack of the present application is provided.

[0046] Figure 5 A battery voltage schematic diagram obtained after voltage compensation of the battery voltage collected in the present application is provided. Figure 3 A battery voltage schematic diagram obtained after voltage compensation of the battery voltage collected in the present application is provided.

[0047] Figure 6 A battery voltage schematic diagram obtained after voltage compensation of the battery voltage collected in the present application is provided. Figure 4 A battery voltage schematic diagram obtained after voltage compensation of the battery voltage collected in the present application is provided.

[0048] Figure 7 An architecture diagram of a nickel sheet internal resistance dynamic compensation system for improving the capacity of a lithium battery is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0049] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0050] Embodiment one:

[0051] Specifically, refer to Figure 1 , Figure 1 A flowchart of a nickel sheet internal resistance dynamic compensation method for improving the capacity of a lithium battery is provided for the embodiments of the present application, and the method specifically includes:

[0052] Preset step 100: Detect the internal resistance of the connecting nickel strips of each lithium battery in the battery pack.

[0053] For example, please refer to Figure 2 , Figure 2 This is an internal connection structure diagram of a battery pack provided in an embodiment of the present invention, which is composed of 6 lithium batteries connected in series;

[0054] like Figure 2 As shown, due to the unreasonable connection nickel sheet structure and acquisition line wiring points, connection nickel sheets of different lengths were introduced in sections 2, 4, and 5. The dynamic compensation method in this embodiment mainly calculates the influence of the internal resistance of the additional nickel sheet. Therefore, the lithium battery can be set as an ideal lithium battery, that is, the influence of the internal resistance of the lithium battery itself is ignored to facilitate the calculation.

[0055] In step 100, the detection or measurement of internal resistance is a conventional technique in the field. For example, an internal resistance tester can be used, or the internal resistance of the connecting nickel strip of each lithium battery can be calculated by keeping the working current of the battery pack constant and then using Ohm's law and the voltage difference between the sampling voltage of each other lithium battery and the sampling voltage of the first lithium battery.

[0056] Preset step 101: Connect each voltage sampling point of the battery pack to the predetermined voltage acquisition line of the AFE chip one by one.

[0057] like Figure 2 As shown, each lithium battery has a voltage sampling point (i.e., ...) on its positive and negative electrode sides. Figure 2 The endpoints of the thin blue lines (in the diagram) are used for electrical connection to the voltage acquisition lines corresponding to the AFE chip.

[0058] Step 110: Monitor the working status of the battery pack in real time through the AFE chip, and collect the working current of the battery pack and the current battery voltage of each lithium battery.

[0059] Step 111: When the battery pack is in the charging / discharging state, calculate the compensation voltage of each lithium battery based on the collected operating current and the internal resistance of the connecting nickel strip of each lithium battery in the battery pack that has been detected in advance.

[0060] set up Figure 2 Each lithium battery in the middle is V cell =3600mV, charging current is 10A, discharging current is 10A;

[0061] like Figure 3 and Figure 4 As shown, Figure 3 for Figure 2 A schematic diagram of the battery voltage collected when the battery pack is charging. Figure 4 forFigure 2 The schematic diagram of the battery voltage collected by the battery pack in the discharging state;

[0062] As shown in the figure, when the battery pack is in the charging state, the battery voltage of the 2nd, 4th and 5th lithium batteries of the battery pack collected is obviously higher than 3600mV, and needs to be negatively compensated; Figure 3

[0063] As shown in the figure, when the battery pack is in the discharging state, the battery voltage of the 2nd, 4th and 5th lithium batteries of the battery pack collected is obviously lower than 3600mV, and needs to be positively compensated. Figure 4

[0064] Step 112, when the battery pack is in the static state, the collected battery voltage is not compensated, and the current battery voltage of each lithium battery is regarded as the true voltage of each lithium battery.

[0065] According to Ohm's law, the pressure drop value of the connection nickel sheet resistance is only generated when the current is not 0, the greater the current value, the greater the pressure drop value, and when the current value is 0, no pressure drop value is generated, so the lithium battery voltage collection is not affected, therefore, in the embodiment, when the battery pack is in the static state, the collected battery voltage is not compensated.

[0066] Step 120, compensating the voltage of each lithium battery according to the compensation voltage of each lithium battery to obtain the true voltage of each lithium battery;

[0067] The compensation voltage of the single lithium battery is calculated by the working current of the battery pack * the internal resistance of the connection nickel sheet of the single lithium battery.

[0068] Specifically, in the embodiment, when the battery pack is in the charging state, the calculation formula of the true voltage of the lithium battery is: V cell = V afe -R nic *I chg ;

[0069] When the battery pack is in the discharging state, the voltage compensation is positive compensation, and the calculation formula of the true voltage of the lithium battery is: V cell = V afe +R nic *I dsg ;

[0070] Wherein, V cell is the true voltage of the lithium battery, V afe is the battery voltage collected by the AFE chip, R nic is the internal resistance of the connection nickel sheet of the lithium battery, and I chg is the charging current of the lithium battery collected by the AFE chip, I​​dsg The discharge current of the lithium battery collected by the AFE chip.

[0071] Please refer to Figure 5 and Figure 6 , Figure 5 The battery voltage diagram obtained after voltage compensation is performed on the battery voltage collected in the Figure 3 Figure 6 The battery voltage diagram obtained after voltage compensation is performed on the battery voltage collected in the Figure 4

[0072] In summary, the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery provided in the embodiment can collect the battery voltage of the battery pack through the AFE chip when the battery pack is in the charging / discharging state, and can correspondingly compensate the battery voltage of the lithium battery collected by following the change of the current and the internal resistance of the connected nickel sheet, so as to eliminate the additional voltage value caused by the connected nickel sheet, improve the voltage collection accuracy of the lithium battery, reduce the barrel short board effect of the lithium battery, help to improve the capacity, endurance time and cycle life of the lithium battery, and maximize the performance of the lithium battery.

[0073] Embodiment two:

[0074] Please refer to Figure 7 , Figure 7 The architecture diagram of the nickel sheet internal resistance dynamic compensation system for improving the capacity of the lithium battery provided in the embodiment of the application;

[0075] The nickel sheet internal resistance dynamic compensation system comprises an MCU 30 and an AFE chip 20.

[0076] The AFE chip 20 is used for monitoring the working state of the battery pack in real time, and collecting the working current of the battery pack 10 and the current battery voltage of each lithium battery; wherein each voltage sampling point of the battery pack 10 is electrically connected to each voltage collection line of the AFE chip 20 in one-to-one correspondence.

[0077] The MCU 30 is electrically connected to the AFE chip 20, and is used for calculating the compensation voltage of each lithium battery according to the collected working current and the internal resistance of the connected nickel sheet of each lithium battery of the battery pack 10 pre-detected when the battery pack 10 is in the charging / discharging state; and is also used for performing voltage compensation on each lithium battery according to the compensation voltage of each lithium battery, to obtain the true voltage of each lithium battery.

[0078] The calculation method of the compensation voltage of a single lithium battery is: the working current of the battery pack 10 * the internal resistance of the connected nickel sheet of the single lithium battery.

[0079] ​​Further, the nickel sheet internal resistance dynamic compensation system further comprises an internal resistance tester 40 for detecting the internal resistance of the connection nickel sheet of each lithium battery of the battery pack 10.

[0080] The MCU 30 is electrically connected to the internal resistance tester 40.

[0081] It can be understood that, since the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery has been described in detail in Embodiment One, the description will not be repeated in this embodiment.

[0082] In summary, the nickel sheet internal resistance dynamic compensation system for improving the capacity of the lithium battery provided in this embodiment can, when the battery pack 10 is in a charging / discharging state, calculate the compensation by the AFE chip 20 collecting the battery voltage to the MCU 30, and the MCU 30 can, when calculating the compensation, compensate the collected battery voltage of the lithium battery by following the change of the current and the internal resistance of the connection nickel sheet, so as to eliminate the additional voltage value caused by the connection nickel sheet, improve the voltage collection accuracy of the lithium battery, reduce the barrel short board effect of the lithium battery, help to improve the capacity, endurance time and cycle life of the lithium battery, and maximize the performance of the lithium battery.

[0083] Embodiment Three:

[0084] The embodiment further provides a computer readable storage medium, and at least one instruction is stored in the storage medium. The instruction is loaded and executed by a processor to implement the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery according to Embodiment One.

[0085] Since the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery has been described in detail in Embodiment One, the description will not be repeated in this embodiment.

[0086] Embodiment Three:

[0087] The application further provides a computer program product, which comprises a computer program / instruction. When the computer program / instruction is executed by a processor, a nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery according to Embodiment One is implemented.

[0088] Since the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery has been described in detail in Embodiment One, the description will not be repeated in this embodiment.

[0089] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or by program instructing relevant hardware to complete, and the program can be stored in a computer readable storage medium. The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Based on such understanding, the technical solutions of the present application, or the entire or part of the technical solutions which essentially contribute to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0090] The above description is only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features. Such modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for improving the capacity of a lithium battery by dynamically compensating the internal resistance of a nickel sheet, characterized by, The application relates to a battery pack voltage compensation method and device. The working state of the battery pack is monitored in real time through an AFE chip, and the working current of the battery pack and the current battery voltage of each lithium battery are collected; When the battery pack is in a charging / discharging state, the compensation voltage of each lithium battery is calculated according to the collected working current and the internal resistance of the connecting nickel sheet of each lithium battery of the battery pack detected in advance; The real voltage of each lithium battery is obtained by performing voltage compensation on each lithium battery according to the compensation voltage of each lithium battery. The compensation voltage of a single lithium battery is calculated by multiplying the working current of the battery pack by the internal resistance of the connecting nickel sheet of the single lithium battery.

2. The method for improving the capacity of lithium batteries by dynamically compensating the internal resistance of nickel sheets according to claim 1, characterized in that, Before the working state of the battery pack is monitored in real time through the AFE chip, and the working current of the battery pack and the current battery voltage of each lithium battery are collected, the method further comprises the following steps: The internal resistance of the connecting nickel sheet of each lithium battery of the battery pack is detected; Each voltage sampling point of the battery pack is electrically connected to each voltage collection line of the AFE chip in one-to-one correspondence; Each lithium battery is provided with one voltage sampling point on the positive / negative pole side.

3. The method of claim 2, wherein the method is a method of improving the capacity of a lithium battery by dynamically compensating for the internal resistance of a nickel sheet, characterized by, After the working state of the battery pack is monitored in real time through the AFE chip, and the working current of the battery pack and the current battery voltage of each lithium battery are collected, the method further comprises the following steps: When the battery pack is in a static state, the collected battery voltage is not subjected to voltage compensation, and the current battery voltage of each lithium battery collected is regarded as the real voltage of each lithium battery.

4. The method for improving the capacity of lithium batteries by dynamically compensating the internal resistance of nickel sheets according to claim 2, characterized in that, The real voltage of each lithium battery is obtained by performing voltage compensation on each lithium battery according to the compensation voltage of each lithium battery. When the battery pack is in a charging state, the voltage compensation is negative compensation, and the calculation formula of the real voltage of the lithium battery is: V cell = V afe - R nic * I chg ; When the battery pack is in a discharging state, the voltage compensation is positive compensation, and the calculation formula of the real voltage of the lithium battery is: V cell = V afe + R nic I dsg ; Wherein, V cell is the true voltage of the lithium battery, V afe is the battery voltage collected by the AFE chip, R nic is the internal resistance of the lithium battery connected to the nickel sheet, I chg is the charging current of the lithium battery collected by the AFE chip, I dsg is the discharging current of the lithium battery collected by the AFE chip.

5. A nickel sheet internal resistance dynamic compensation system for improving the capacity of a lithium battery, characterized in that, The application relates to a battery pack voltage compensation method and device. The application relates to a battery pack voltage compensation method and device. The AFE chip is used for monitoring the working state of the battery pack in real time, collecting the working current of the battery pack and the current battery voltage of each lithium battery, and electrically connecting each voltage sampling point of the battery pack to each voltage collection line of the AFE chip in one-to-one correspondence. The MCU is electrically connected to the AFE chip and is used for calculating the compensation voltage of each lithium battery according to the collected working current and the internal resistance of the connecting nickel sheet of each lithium battery of the battery pack when the battery pack is in a charging / discharging state, and performing voltage compensation on each lithium battery according to the compensation voltage of each lithium battery to obtain the real voltage of each lithium battery. The compensation voltage of a single lithium battery is calculated by multiplying the working current of the battery pack by the internal resistance of the connecting nickel sheet of the single lithium battery.

6. The nickel sheet internal resistance dynamic compensation system for improving the capacity of a lithium battery according to claim 5, characterized in that, The internal resistance tester is used for detecting the internal resistance of the connecting nickel sheet of each lithium battery of the battery pack. The MCU is electrically connected to the internal resistance tester.

7. The nickel sheet internal resistance dynamic compensation system for improving the capacity of lithium batteries according to claim 6, characterized in that, The MCU is further used for not performing voltage compensation on the collected battery voltage when the battery pack is in a static state, and regarding the current battery voltage of each lithium battery collected as the real voltage of each lithium battery. The real voltage of each lithium battery is obtained by performing voltage compensation on each lithium battery according to the compensation voltage of each lithium battery.

8. The nickel sheet internal resistance dynamic compensation system for improving the capacity of lithium batteries according to claim 6, characterized in that, ​ When the battery pack is in the charging state, the voltage compensation is negative compensation, and the calculation formula of the true voltage of the lithium battery is: V cell = V afe - R nic * I chg ; When the battery pack is in the discharging state, the voltage compensation is positive compensation, and the calculation formula of the true voltage of the lithium battery is: V cell = V afe + R nic I dsg ; Wherein, V cell is the true voltage of the lithium battery, V afe is the battery voltage collected by the AFE chip, R nic is the internal resistance of the lithium battery connected to the nickel sheet, I chg is the charging current of the lithium battery collected by the AFE chip, I dsg is the discharging current of the lithium battery collected by the AFE chip.

9. A computer-readable storage medium, having stored therein at least one instruction, the medium comprising: The instructions are loaded and executed by the processor to implement the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery as claimed in any one of claims 1-4.

10. A computer program product comprising computer programs / instructions, characterized in that, When the computer program / instructions are executed by the processor, the nickel sheet internal resistance dynamic compensation method for improving the capacity of the lithium battery as claimed in any one of claims 1-4 is implemented.

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