A method, apparatus, and vehicle for preventing electrochemical corrosion of lithium-ion power batteries.

Abstract

This invention discloses a method, apparatus, and vehicle for preventing electrochemical corrosion of lithium-ion power batteries, belonging to the technical field of battery energy conversion. The method includes the following steps: detecting and fitting the casing voltage of the lithium-ion power battery; comparing the fitting result with a preset casing voltage threshold to determine if there are any abnormalities in the casing voltage change; calculating the voltage change rate of the lithium-ion power battery to identify potential electrochemical corrosion risks; calculating the voltage difference between the negative electrode and the casing of the lithium-ion power battery to obtain different corrosion risk areas; and adopting different anti-electrochemical corrosion strategies according to the different corrosion risks. This invention detects, fits, calculates, analyzes, and evaluates the electrochemical corrosion risk of lithium-ion power batteries, identifies potential electrochemical corrosion failures in the battery casing in advance, delays further decrease in the battery casing potential, and achieves the purpose of preventing electrochemical corrosion.

Description

Technical Field

[0001] This invention relates to a method, apparatus, and vehicle for preventing electrochemical corrosion in lithium-ion power batteries, and particularly to a method, apparatus, and vehicle for preventing electrochemical corrosion in lithium-ion power batteries, belonging to the technical field of battery energy conversion. Background Technology

[0002] As a core component of electric vehicles, lithium-ion batteries directly impact the performance, reliability, and safety of these vehicles. With the increasing adoption of electric vehicles, their safety has become a major concern. Lithium-ion batteries with aluminum casings offer advantages such as light weight, high energy density, good heat dissipation, and high mechanical strength. However, during production, the positive and negative electrode plates, tabs, and terminals may come into direct contact with the aluminum casing, or laser welding slag may remain inside the casing. This can lead to indirect contact between the positive and negative electrode plates, tabs, and terminals and the aluminum casing. Alternatively, during the production of lithium-ion battery modules, molten or solid welding slag may exist between the high and low voltage wiring harnesses and the casing, causing a gradual decrease in the battery casing voltage. This, in turn, reduces the voltage difference between the battery casing and the negative electrode, causing lithium ions to preferentially intercalate into the aluminum casing through the electrolyte during charging and discharging, forming lithium-aluminum compounds. If the battery casing voltage remains low for an extended period, corrosion and even leakage can occur, affecting the battery's normal and safe operation. Electrolyte leakage can also cause high-voltage arcing between the cell and the casing, posing a risk of thermal runaway. Summary of the Invention

[0003] The purpose of this invention is to provide a method, apparatus, and vehicle for preventing electrochemical corrosion of lithium-ion power batteries. The first technical problem to be solved is to analyze and evaluate the electrochemical corrosion risk of lithium-ion power batteries by detecting the casing voltage and performing fitting and calculation, and to adopt corresponding anti-electrochemical corrosion strategies.

[0004] Another technical problem that this invention aims to solve is to calculate the slope of the fitted straight line based on the fitting results, and to divide the voltage difference into different corrosion risk areas according to the different corrosion risks.

[0005] Another technical problem that this invention aims to solve is to adopt different coping strategies for different corrosion risk areas.

[0006] The present invention also provides a device and vehicle for preventing electrochemical corrosion of lithium-ion power batteries. By improving the structure of the battery, the device enables the vehicle to monitor the electrochemical corrosion risk of lithium-ion power batteries in real time during driving or parking.

[0007] This invention provides the following solution:

[0008] A method for preventing electrochemical corrosion in lithium-ion power batteries, specifically including:

[0009] The casing voltage of lithium-ion power batteries is detected based on time series data, and then fitted in two-dimensional spatial coordinates.

[0010] The fitting results are compared with the preset casing voltage threshold to determine whether there are any abnormalities in the casing voltage of the lithium-ion power battery.

[0011] Calculate the voltage change rate of lithium-ion power batteries to identify potential electrochemical corrosion risks;

[0012] The voltage difference between the negative electrode and the casing of the lithium-ion power battery is calculated to obtain different corrosion risk zones;

[0013] Based on the different corrosion risks, the voltage difference is divided into different corrosion risk zones, and corresponding anti-electrochemical corrosion strategies are adopted.

[0014] Furthermore, the fitting in two-dimensional spatial coordinates specifically involves performing linear fitting on the coordinates of two-dimensional spatial points to obtain the corresponding fitted straight line;

[0015] Based on the obtained fitted straight line, the slope of the fitted line is calculated to predict the rate of voltage drop of the lithium-ion power battery casing and the casing voltage at a specific time:

[0016] If the rate of voltage drop in the casing exceeds the preset rate of voltage drop, the battery casing voltage is determined to be abnormal, and the battery may be at risk of electrochemical corrosion.

[0017] If the casing voltage is less than the preset casing voltage threshold, the battery casing voltage is determined to be abnormal, and the battery casing has undergone electrochemical corrosion.

[0018] Furthermore, the rate of change of voltage of all battery casings in the battery pack is calculated, and the risk of casing corrosion is determined based on the rate of change.

[0019] Calculate the voltage difference between the negative terminal of the battery and the battery casing, and determine whether there is a risk of corrosion based on the voltage difference;

[0020] Based on the magnitude of the voltage difference, a decision is made as to whether it is necessary to test the battery's self-discharge rate in order to further analyze the corrosion risk.

[0021] Furthermore, if the voltage difference between the negative terminal of the battery and the casing is less than 1.5V, the battery is considered to be at risk of corrosion.

[0022] If the voltage difference between the negative terminal of the battery and the casing is greater than 3V, the battery is considered to have no risk of corrosion.

[0023] If the voltage difference between the negative terminal of the battery and the casing is greater than or equal to 1.5V and less than or equal to 3V, the self-discharge rate of the battery is tested, and the voltage difference between each battery in the battery pack is also tested for further analysis of corrosion risk.

[0024] Furthermore, if the voltage difference between the battery negative terminal and the casing is greater than or equal to 1.5V and less than or equal to 3V, the battery's self-discharge rate is tested, and the voltage difference between each battery in the battery pack is also tested for further analysis of corrosion risk. Specifically:

[0025] Manufacturing special battery cells: separately manufacturing battery cells with micro-short circuits between the negative electrode plate and the casing, the negative electrode tab and the casing, the negative electrode adapter plate and the casing, and the negative electrode post and the casing;

[0026] Assemble special battery cells: Assemble special battery cells with normal battery cells to form battery packs, and conduct cycle and storage tests on the battery packs;

[0027] Measuring the self-discharge rate of the specially designed battery cell: If the temperature and self-discharge rate of the specially designed battery cell are within the specified range, the self-discharge rate specification can be calculated.

[0028] Calculate the cell voltage difference specifications within the battery pack: Measure the cell voltage difference within the battery pack. Assuming the temperature and state of charge (SOC) of the specially designed cells are within the specified range, calculate the cell voltage difference specifications within the battery pack.

[0029] Recharging after cyclic charging and discharging: For battery cells that exceed specifications when the differential voltage and self-discharge rate are different, cyclic charging and discharging treatment is performed and then recharged.

[0030] Casing repair treatment: For cells whose cell differential voltage specification is greater than the cell differential voltage specification and whose self-discharge rate is greater than the self-discharge rate specification, casing repair treatment is performed;

[0031] Repaired cell testing: The casing voltage of the repaired cell is tested, and the temperature and SOC of the specially made cell are within the specified range.

[0032] A system for preventing electrochemical corrosion in lithium-ion power batteries, specifically comprising:

[0033] The battery casing voltage detection and fitting module is used to detect the casing voltage of lithium-ion power batteries based on time series and fit it in two-dimensional spatial coordinates.

[0034] The fitting result comparison and judgment module is used to compare the fitting result with the preset casing voltage threshold to determine whether there is any abnormality in the change of the casing voltage of the lithium-ion power battery.

[0035] The battery voltage change rate calculation module is used to calculate the voltage change rate of lithium-ion power batteries and identify potential electrochemical corrosion risks.

[0036] The voltage difference calculation module between the negative electrode and the casing is used to calculate the voltage difference between the negative electrode and the casing of the lithium-ion power battery, and to obtain different corrosion risk areas.

[0037] The electrochemical corrosion risk assessment implementation strategy module is used to divide the voltage difference into different corrosion risk areas according to different corrosion risks, and adopt corresponding electrochemical corrosion prevention strategies.

[0038] A device for preventing electrochemical corrosion of lithium-ion power batteries includes a bare cell and a battery casing disposed outside the bare cell. A positive electrode post and a negative electrode post are installed on one side of the battery casing. An injection hole and an explosion-proof valve are provided between the positive and negative electrode posts. The device also includes a third electrode post electrically connected to the battery casing for sampling the voltage of the battery casing.

[0039] The third terminal is used by the battery management system to sample the battery casing voltage in real time. The battery management system records the battery casing voltage and analyzes the detected battery casing voltage data to detect whether there is any overlap between the negative electrode plate and / or negative electrode tab and / or negative electrode adapter and / or negative terminal and the battery casing.

[0040] An electronic device is characterized in that it comprises: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the method.

[0041] A computer-readable storage medium storing a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of the method.

[0042] A vehicle, specifically comprising:

[0043] An electronic device for implementing a method to prevent electrochemical corrosion in the lithium-ion power battery;

[0044] A processor that runs a program that, when the program is running, performs the steps of the method for preventing electrochemical corrosion of lithium-ion power batteries in response to data output from the electronic device.

[0045] A storage medium for storing a program that, when run, executes the steps of the method for preventing electrochemical corrosion of lithium-ion power batteries in response to data output from an electronic device.

[0046] Compared with the prior art, the present invention has the following advantages:

[0047] This invention optimizes the structure of aluminum lithium-ion battery casings and analyzes and evaluates the electrochemical corrosion risk of lithium-ion power batteries by detecting the casing voltage and performing fitting and calculation. Different anti-electrochemical corrosion strategies are adopted to identify battery casings that may fail due to electrochemical corrosion in advance, and the further decline of the battery casing potential is delayed by increasing the casing potential, thereby achieving the purpose of preventing electrochemical corrosion.

[0048] This invention processes the casing voltage collected by the battery management system, linearly fits the changing trend of the casing voltage, and determines whether there is a risk of electrochemical corrosion in the casing potential of the tested battery. By analyzing the fitted casing voltage data, cells that may have an electrochemical corrosion risk can be identified and electrochemical repair treatment can be performed on them; by analyzing the fitted casing voltage data, cells that have already undergone electrochemical corrosion but have not yet experienced electrolyte leakage can be identified and protective treatment can be performed on them.

[0049] This invention adds a third terminal directly connected to the battery casing on the battery top cover and monitors the voltage of the aluminum lithium-ion battery casing in real time. When the casing voltage drops below a certain value, a low voltage signal is uploaded to the vehicle via the BMS battery management system, alerting the user to perform vehicle maintenance and replace the faulty module, thus reducing the risk of battery leakage. If the casing voltage drops further, the lithium-ion battery is reverse-charged to repair the damaged casing, preventing electrolyte leakage from causing insulation failure or even safety risks. Through optimization of the aluminum lithium-ion battery casing, electrolyte leakage caused by electrochemical corrosion can be completely eliminated, significantly reducing the risk of battery pack insulation failure and thermal runaway caused by high-voltage arcing due to electrolyte leakage.

[0050] This invention detects the casing voltage of lithium-ion power batteries based on time series data, fits the data in two-dimensional spatial coordinates to generate a fitted straight line, calculates the slope of the fitted line, and estimates the rate of voltage drop and the casing voltage at a specific time. By detecting the casing voltage and performing fitting and calculation, the invention analyzes and evaluates the electrochemical corrosion risk of lithium-ion power batteries. Different anti-electrochemical corrosion strategies are adopted for different corrosion risk areas. This invention can monitor the electrochemical corrosion status of lithium-ion power batteries in real time, analyze different situations, and implement corresponding strategies in a targeted manner.

[0051] This invention can be widely used in vehicle systems. The device can be installed inside the battery pack of the vehicle without damaging the battery casing. It can be used for real-time monitoring of the entire vehicle and can effectively prevent leakage from battery casings that have already undergone electrochemical corrosion. Attached Figure Description

[0052] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0053] Figure 1 This is a flowchart of a method for preventing electrochemical corrosion in lithium-ion power batteries.

[0054] Figure 2 This is a flowchart of a method for testing the self-discharge rate of the battery and the voltage difference between the individual batteries in the battery pack.

[0055] Figure 3 This is an architecture diagram of a system for preventing electrochemical corrosion in lithium-ion power batteries.

[0056] Figure 4 This is a schematic diagram of the structure of a lithium-ion power battery.

[0057] Figure 5 This is a schematic diagram of the positive electrode post.

[0058] Figure 6 This is a flowchart of a specific embodiment.

[0059] Figure 7 This is a schematic diagram of the electronic device. Detailed Implementation

[0060] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] like Figure 1 The method for preventing electrochemical corrosion of lithium-ion power batteries shown includes the following steps:

[0062] Step T1: Based on the time series detection of the lithium-ion power battery casing voltage, fit it in two-dimensional spatial coordinates;

[0063] Specifically, fitting is performed in two-dimensional spatial coordinates, which involves linear fitting of two-dimensional spatial point coordinates to obtain the corresponding fitted line;

[0064] Based on the obtained fitted straight line, the slope of the fitted line is calculated to predict the rate of voltage drop of the lithium-ion power battery casing and the casing voltage at a specific time:

[0065] If the rate of voltage drop in the casing exceeds the preset rate of voltage drop, the battery casing voltage is determined to be abnormal, and the battery may be at risk of electrochemical corrosion.

[0066] If the casing voltage is less than the preset casing voltage threshold, the battery casing voltage is determined to be abnormal, and the battery casing has undergone electrochemical corrosion.

[0067] For example, the battery casing voltage is recorded at X different times to obtain X two-dimensional spatial point coordinates that correspond one-to-one with the casing voltage, where X is an integer greater than or equal to 5; linear fitting is performed on the X two-dimensional spatial point coordinates to obtain a fitted straight line; based on the fitted straight line, it is determined whether there is a risk of electrochemical corrosion in the casing potential of the tested battery.

[0068] The purpose of real-time detection and acquisition of the lithium-ion power battery casing voltage in step T1 is to: The battery management system samples the cell casing voltage in real time, records the battery casing potential data, and analyzes the detected casing potential data. This prevents the negative electrode plate, negative electrode tab, negative electrode adapter, or negative electrode post inside the battery from bridging with the battery casing, which could cause a drop in battery casing potential that cannot be detected.

[0069] A drop in the casing potential can cause lithium ions to embed into the battery casing, leading to casing pulverization and corrosion, and ultimately causing electrolyte leakage in the battery. This invention can identify cells that may leak due to electrochemical corrosion in advance, reducing the risk of battery system insulation failure caused by cell electrochemical corrosion and leakage.

[0070] Step T2: Compare the fitting results with the preset casing voltage threshold to determine whether there is any abnormality in the change of the casing voltage of the lithium-ion power battery.

[0071] Step T3: Calculate the voltage change rate of the lithium-ion power battery and identify potential electrochemical corrosion risks;

[0072] Specifically, the rate of change of the casing voltage of all batteries in the battery pack is calculated, and the risk of casing corrosion is determined based on the rate of change; for example, the rate of change of the casing voltage of Y batteries in the battery pack is calculated, where Y is the total number of batteries in the battery pack.

[0073] Calculate the voltage difference between the negative terminal of the battery and the battery casing, and determine whether there is a risk of corrosion based on the voltage difference;

[0074] Depending on the magnitude of the voltage difference, the strategy may require testing the battery's self-discharge rate to further analyze corrosion risks.

[0075] Step T4: Calculate the voltage difference between the negative electrode and the casing of the lithium-ion power battery to obtain different corrosion risk areas;

[0076] Specifically, if the voltage difference between the negative terminal of the battery and the casing is less than 1.5V, the battery is considered to be at risk of corrosion.

[0077] If the voltage difference between the negative terminal of the battery and the casing is greater than 3V, the battery is considered to have no risk of corrosion.

[0078] If the voltage difference between the negative terminal of the battery and the casing is greater than or equal to 1.5V and less than or equal to 3V, the self-discharge rate of the battery is tested, and the voltage difference between each battery in the battery pack is also tested for further analysis of corrosion risk.

[0079] like Figure 2 As shown, for example: if the voltage difference between the negative terminal of the battery and the casing is greater than or equal to 1.5V and less than or equal to 3V, then the self-discharge rate of the battery is tested, and the voltage difference between each battery in the battery pack is also tested for further analysis of corrosion risk. Specifically:

[0080] Step S1: Fabricate special battery cells: Fabricate battery cells with micro-short circuits between the negative electrode plate and the casing, the negative electrode tab and the casing, the negative electrode adapter plate and the casing, and the negative electrode post and the casing, respectively.

[0081] Step S2: Assemble the special battery cells: Assemble the special battery cells with the normal battery cells to form a battery pack, and conduct cycle and storage tests on the battery pack.

[0082] Step S3: Measure the self-discharge rate ΔSOC of the special battery cell. The temperature and self-discharge rate of the special battery cell are within the specified range. Calculate the self-discharge rate specification dSOC1.

[0083] Calculate the cell voltage difference specification in the battery pack: Measure the cell voltage difference △SOC in the battery pack, and check whether the temperature and state of charge (SOC) of the specially designed cells are within the specified range. Calculate the cell voltage difference specification △SOC1 in the battery pack.

[0084] Step S4, Recharging after Cyclic Charge and Discharge: For cells that exceed specifications when the differential voltage and self-discharge rate are different, recharge them after cyclic charge and discharge.

[0085] "Not exceeding specifications at the same time" refers to the following situations not occurring simultaneously: the cell voltage difference specification is greater than the cell voltage difference specification △SOC1, and the cell self-discharge rate △SOC is greater than the self-discharge rate specification dSOC1.

[0086] Step S5, Casing Repair: For cells with a differential voltage specification greater than the specified differential voltage specification △

[0087] Cells with SOC1 and a self-discharge rate ΔSOC greater than the self-discharge rate specification dSOC1 undergo casing repair.

[0088] Step S6, Repair Cell Test: Perform a casing voltage test on the repaired cell. The temperature and SOC of the specially made cell are within the specified range.

[0089] Step T5: Based on the different corrosion risks, the voltage difference is divided into different corrosion risk areas, and corresponding anti-electrochemical corrosion strategies are adopted.

[0090] As can be seen from the method flow of the embodiments of the present invention, the method steps are as follows: step T1 is sampling and fitting, step T2 is comparison and judgment, step T3 is risk identification, step T4 is graded processing, and step T5 is implementing the corresponding strategy. Each step has different specific implementation methods, forming a complete method for preventing electrochemical corrosion of lithium-ion power batteries.

[0091] This invention involves processing the casing voltage collected by the battery management system and linearly fitting it to obtain the trend of casing voltage changes, thereby determining whether there is a risk of electrochemical corrosion in the casing potential of the tested battery. By analyzing the fitted casing voltage data, different electrochemical corrosion strategies are adopted. For example, cells potentially at risk of electrochemical corrosion can be identified and electrochemically repaired. Cells that have already undergone electrochemical corrosion but have not yet leaked electrolyte can be identified and protected. Specific repair and protection measures include cyclic charging and discharging of the third electrode post to slow down the rate of lithium-ion embedding into the aluminum battery casing, preventing further electrochemical corrosion and subsequent casing leakage. Alternatively, the casing voltage of the cells can be sampled in real time, the battery casing potential data can be recorded, and the detected battery casing potential data can be analyzed and compared. By identifying cells potentially at risk of electrochemical corrosion and leakage in advance, the risk of battery system insulation failure due to cell electrochemical corrosion and leakage can be reduced.

[0092] For the purpose of simplicity, the method steps disclosed in the above embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0093] like Figure 3 The system shown for preventing electrochemical corrosion of lithium-ion power batteries specifically includes:

[0094] The battery casing voltage detection and fitting module is used to detect the casing voltage of lithium-ion power batteries based on time series and fit it in two-dimensional spatial coordinates.

[0095] The fitting result comparison and judgment module is used to compare the fitting result with the preset casing voltage threshold to determine whether there is any abnormality in the change of the casing voltage of the lithium-ion power battery.

[0096] The battery voltage change rate calculation module is used to calculate the voltage change rate of lithium-ion power batteries and identify potential electrochemical corrosion risks.

[0097] The voltage difference calculation module between the negative electrode and the casing is used to calculate the voltage difference between the negative electrode and the casing of the lithium-ion power battery, and to obtain different corrosion risk areas.

[0098] The electrochemical corrosion risk assessment implementation strategy module is used to divide the voltage difference into different corrosion risk areas according to different corrosion risks, and adopt corresponding electrochemical corrosion prevention strategies.

[0099] It is worth noting that although only some basic functional modules are disclosed in this embodiment, it does not mean that the composition of this system is limited to the above-mentioned basic functional modules. On the contrary, what this embodiment intends to express is that, based on the above-mentioned basic functional modules, those skilled in the art can arbitrarily add one or more functional modules in combination with existing technology to form an infinite number of embodiments or technical solutions. That is to say, this system is open rather than closed. The fact that this embodiment only discloses a few basic functional modules does not mean that the scope of protection of the claims of this invention is limited to the disclosed basic functional modules. At the same time, for the convenience of description, the above device is described separately according to its functions as various units and modules. Of course, in implementing this invention, the functions of each unit and module can be implemented in one or more software and / or hardware.

[0100] The implementation methods of the system described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0101] like Figure 4 and Figure 5 The attached diagram shows a device for preventing electrochemical corrosion in lithium-ion power batteries, with the following reference numerals:

[0102] 1. Bare cell; 2. Battery casing; 3. Negative terminal; 4. Electrolyte filling hole; 5. Explosion-proof valve; 6. Third terminal; 7. Positive terminal; 7-1. Insulating material; 7-2. Aluminum terminal; 7-3. Positive temperature coefficient resistor.

[0103] The device for preventing electrochemical corrosion of lithium-ion power batteries includes a bare cell 1 and a battery casing 2 disposed outside the bare cell. A positive electrode post 7 and a negative electrode post 3 are installed on one side of the battery casing 2. An injection hole 4 and an explosion-proof valve 5 are provided between the positive and negative electrode posts. It also includes a third electrode post 6 that is electrically connected to the battery casing 2 and is used to sample the voltage of the battery casing 2.

[0104] The third terminal is used by the battery management system to sample the cell casing voltage in real time. The battery management system records the battery casing voltage and analyzes the detected battery casing voltage data to detect whether there is any overlap between the negative electrode plate and / or negative electrode tab and / or negative electrode adapter and / or negative electrode terminal and the battery casing, preventing situations where the battery casing voltage drops but cannot be detected. In this embodiment of the invention, overlap usually refers to the situation described in the background art where, during the production process, the positive and negative electrode plates, tabs, terminals, etc. of the lithium-ion battery may come into direct contact with the aluminum metal casing, or laser welding slag may remain inside the battery casing, leading to indirect contact between the positive and negative electrode plates, tabs, terminals, etc. and the aluminum metal casing. Alternatively, during the production process of the lithium-ion battery module, there may be molten or solid welding slag between the high and low voltage wiring harnesses and the casing, causing the lithium-ion battery casing voltage to gradually decrease. This, in turn, leads to a gradual decrease in the voltage difference between the battery casing and the negative electrode, causing lithium ions to preferentially intercalate into the aluminum battery casing through the electrolyte during charging and discharging, producing lithium aluminum compounds.

[0105] The positive electrode post 7 and the top cover plate of the battery casing 2 are connected in series with a positive temperature coefficient resistor 7-3 of a certain resistance value. The positive temperature coefficient resistor is located outside the current loop inside the battery cell, so it does not affect the battery cell's electrical performance when the temperature rises. At room temperature, the positive electrode can make the battery casing positively charged by connecting the positive temperature coefficient resistor 7-3 in series, which can effectively prevent lithium ions from embedding into the aluminum casing. When electrolyte leakage occurs, the local current increases, causing the temperature to rise sharply and the resistance value to increase, so that the positive electrode post 7 and the battery casing 2 achieve an insulating effect, and the casing is no longer charged, thereby improving the safety of the battery cell and the battery system.

[0106] The third terminal is directly connected to the battery casing. The battery management system can sample the voltage of the battery casing through the third terminal, monitor the battery casing voltage in real time, and store the voltage data for analysis.

[0107] The casing voltage test process is as follows: the battery temperature is within the preset temperature range, and the battery state of charge (SOC) is within the preset charge range.

[0108] As can be seen from the accompanying drawings and textual description, the embodiments of the present invention improve upon the existing medium-quality lithium-ion battery casing structure by adding a third terminal 6 directly connected to the battery casing on the battery top cover. The third terminal 6 is located between the explosion-proof valve 5 and the negative terminal 3 on the battery top cover, allowing real-time monitoring of the aluminum lithium-ion battery casing voltage. When the casing voltage falls below a certain value, a low voltage signal is transmitted to the vehicle via the BMS battery management system, alerting the user to perform vehicle maintenance and replace the faulty module, thus reducing the risk of battery leakage. When the voltage of the battery casing drops further, the damaged lithium-ion battery casing 2 is repaired by reverse charging, preventing electrolyte leakage that could lead to insulation failure or even safety risks.

[0109] In this embodiment of the invention, by optimizing the aluminum lithium-ion battery casing, the leakage of lithium-ion battery electrolyte caused by electrochemical corrosion can be completely eliminated, and the risk of battery pack insulation failure and thermal runaway caused by high-voltage arcing due to electrolyte leakage can be greatly reduced.

[0110] It is worth noting that those skilled in the art will understand that the above-described device includes a voltage sampler, a voltage information storage device, and a voltage information processor that includes a detection method, a calculation method, and a judgment method program.

[0111] A drop in the casing potential can cause lithium ions to embed into the battery casing, leading to casing pulverization and corrosion, and ultimately causing electrolyte leakage in the battery. This invention can identify cells that may leak due to electrochemical corrosion in advance, reducing the risk of battery system insulation failure caused by cell electrochemical corrosion and leakage.

[0112] As can be seen, in this embodiment of the invention, the battery cell casing voltage is sampled in real time, the battery casing potential data is recorded, and the detected battery casing potential data is analyzed and compared. Cells that may have an electrochemical corrosion risk are identified and subjected to electrochemical repair treatment. By analyzing the fitted casing voltage data, cells that have already undergone electrochemical corrosion but have not yet experienced electrolyte leakage can be identified and subjected to protective treatment.

[0113] Those skilled in the art will understand that a battery cell refers to a single electrochemical cell containing positive and negative electrodes. The battery cell is the most crucial part of the entire battery; once the battery cell is manufactured, the entire commercially viable battery is considered more than 90% complete. The remaining steps involve packaging and other processing. A battery is a device that converts chemical energy into electrical energy, containing an electrolyte solution and metal electrodes to generate an electric current, within a cup, tank, or other container or composite container.

[0114] There are two main differences between a battery cell and a battery: 1. A basic, simple battery is simply a battery cell with an additional outer packaging. This packaging protects the battery cell and the user from damage and harm from the chemicals inside. This is a simple definition of a battery with a basic protective layer. 2. An advanced battery: The battery cell, connecting board, and control board are further protected with materials such as barley paper, epoxy board, and PVC film. The connecting board connects the battery to the control board, which is a circuit board that provides various protection and control functions. In general, the difference between a battery cell and a battery is that a battery has an additional protective casing and control circuitry, making the entire battery pack safer and more stable than a battery cell. Therefore, in this invention, the terms "battery cell" and "cell" are generally used interchangeably. Using these terms interchangeably does not affect the understanding of the technical solution of this invention by those skilled in the art, nor does it affect the effectiveness of the anti-electrochemical corrosion technology.

[0115] In the description of the embodiments of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "top," and "bottom," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0116] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0117] The terms "comprising" or "including" as used in the specification and claims are open-ended and should be understood as "including but not limited to". Preferred embodiments of the invention will be described subsequently; however, this description is for the purpose of understanding the general principles of the specification and is not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0118] like Figure 6 The flowchart of a specific embodiment of the present invention illustrates the application of an anti-electrochemical corrosion method for lithium-ion power batteries in a specific scenario. This embodiment provides a method for detecting the risk of electrochemical corrosion of battery casings. The method involves recording the casing voltage of the battery at X different times to obtain X two-dimensional spatial point coordinates that correspond one-to-one with the casing voltage, where X is an integer greater than or equal to 5. Linear fitting is then performed on the X two-dimensional spatial point coordinates to obtain a fitted straight line. Based on the fitted straight line, it is determined whether there is a risk of electrochemical corrosion at the casing potential of the tested battery.

[0119] In this embodiment of the invention, the step of linearly fitting the coordinates of the aforementioned X two-dimensional spatial points to obtain a fitted straight line includes:

[0120] 1. Perform linear fitting on the coordinates of X two-dimensional spatial points, including the casing voltage and sampling time, to obtain a fitted straight line;

[0121] 2. Based on the fitted straight line, calculate the slope of the fitted straight line and estimate the rate of voltage drop in the casing.

[0122] 3. Based on the fitted straight line, estimate the casing voltage at a specific time.

[0123] 4. If the voltage drop rate of the battery casing exceeds the preset voltage drop rate, the battery casing voltage is determined to be abnormal, and the battery may be at risk of electrochemical corrosion.

[0124] 5. If the casing voltage is less than the preset casing voltage threshold, the battery casing voltage is determined to be abnormal, and the battery casing has undergone electrochemical corrosion.

[0125] Figure 6 The method flow is as follows:

[0126] The sampler records the casing voltage at different times to obtain the correspondence between time and casing voltage;

[0127] The processor performs a linear fit on the casing voltage-time data to obtain the voltage change rate;

[0128] The processor calculates the rate of voltage drop in the casing and compares it with a preset rate of voltage drop; that is, it calculates the slope of the fitted straight line and estimates the rate of voltage drop in the casing.

[0129] Determine if the current value exceeds the set value. If it does not exceed the set value, continue to the previous step. Previous step: The processor calculates the voltage drop rate of the casing and compares it with the preset voltage drop rate.

[0130] If the current value exceeds the set value, the sampler records the housing voltage at different times and compares it with the preset housing voltage threshold.

[0131] Determine whether the current value exceeds the set value U1 (preset casing voltage threshold). If it does not exceed the set value U1, calculate the battery self-discharge rate and the battery voltage difference in the battery pack.

[0132] Determine whether the self-discharge rate exceeds dSOC1 and whether the cell voltage difference specification in the battery pack is greater than ΔSOC1. If so, perform cyclic charging and discharging on the third terminal and the negative terminal until the repair is completed; if not, recalculate the battery self-discharge rate and the battery voltage difference in the battery pack.

[0133] If the current value exceeds the set value U1 (preset housing voltage threshold), the sampler records the housing voltage at different times and compares it with the preset housing voltage threshold;

[0134] Determine whether the current value exceeds the set value U2 (preset housing voltage threshold). If it does not exceed the set value U2, the sampler continues to record the housing voltage at different times and compares it with the preset housing voltage threshold.

[0135] If the current value exceeds the set value U2, the third electrode and the negative electrode will be charged and discharged in a cycle until the repair is completed.

[0136] In the embodiments of the present invention, U1 and U2 are usually the same threshold, but it is not excluded that they are different preset housing voltage thresholds under special operating conditions.

[0137] The method flowcharts described in the text of the embodiments of the present invention can be combined with the flowcharts in the accompanying drawings to form multiple embodiments. Flowcharts or any process or method descriptions otherwise described herein can be understood as: representing modules, segments, or portions of code comprising one or more executable instructions for implementing a specific logical function or process. Furthermore, the scope of preferred embodiments of the present invention includes additional implementations in which functions may be performed and implemented not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, or by executing computer instructions and implementing corresponding functions according to program structures such as loops, branches, etc., as will naturally be understood by those skilled in the art when implementing the embodiments of the present invention.

[0138] By processing the casing voltage collected by the battery management system, linear fitting is used to obtain the trend of casing voltage changes, thereby determining whether there is a risk of electrochemical corrosion in the casing of the tested battery. Analysis of the fitted casing voltage data can identify cells that may be at risk of electrochemical corrosion, and perform electrochemical repair treatment on them. Analysis of the fitted casing voltage data can also identify cells that have already undergone electrochemical corrosion but have not yet experienced electrolyte leakage, and provide protective treatment for them.

[0139] Taking an embodiment of the present invention as an example, the rate of change of the casing voltage of Y batteries in the battery pack is calculated: Y is the total number of batteries in the battery pack. If there is a cell whose casing voltage change rate is greater than A%, where A is a value between 95 and 100, then it is determined that the battery may have a risk of abnormal casing voltage. Further data analysis is performed on the cells that may have abnormal casing voltage, combining the voltage difference between the negative electrode and the casing of the battery, the self-discharge rate of the battery, and the voltage difference between the individual batteries in the battery pack for comprehensive analysis. The specific steps include:

[0140] 1. Calculate the rate of change of voltage across all battery casings in the battery pack, where Y is the total number of batteries in the battery pack;

[0141] 2. Analyze the rate of change of the casing voltage. If there are cells with a rate of change greater than A%, it is determined that there is a risk of casing corrosion, and further analysis is required.

[0142] 3. Calculate the voltage difference between the negative terminal of the battery and the casing. If the voltage difference is less than 2V, the battery is considered to be at risk of corrosion.

[0143] 4. If the voltage difference between the negative terminal of the battery and the casing is greater than 3V, then the battery is considered to have no risk of corrosion.

[0144] 5. If the voltage difference between the negative terminal of the battery and the casing is greater than 2V but less than 3V, test the self-discharge rate of the battery and the voltage difference between the individual batteries in the battery pack to further analyze the corrosion risk.

[0145] By analyzing the fitted casing voltage data, the casing voltage change rate is calculated, cells with electrochemical corrosion risk are identified, and electrochemical repair treatment is carried out on them.

[0146] If the voltage difference between the negative terminal of the battery and the casing is greater than 2V but less than 3V, further analysis of the battery is required. This includes testing the battery's self-discharge rate and the voltage difference between the individual batteries within the battery pack. The method is characterized as follows:

[0147] 1: Fabricate battery cells with micro-short circuits between the negative electrode plate and the casing, the negative electrode tab and the casing, the negative electrode adapter plate and the casing, and the negative electrode post and the casing, respectively.

[0148] 2: Assemble the specially made battery cells with normal battery cells to form a battery pack, and conduct cycle and storage tests on the battery pack;

[0149] 3: Measure the self-discharge rate dSOC of the specially made battery cell. The temperature and SOC of the specially made battery cell are within the specified range. Calculate the self-discharge rate specification dSOC1.

[0150] 4: Measure the cell pressure difference ΔSOC in the battery pack. The temperature and SOC of the specially made cells are within the specified range. Calculate the cell pressure difference specification ΔSOC1 in the battery pack.

[0151] 5: For battery cells that exceed specifications when the differential pressure and self-discharge rate are different, perform cyclic charging and discharging treatment and then recharge them;

[0152] 6: For battery cells with a differential voltage specification greater than ΔSOC1 and a self-discharge rate greater than dSOC1, perform casing repair treatment.

[0153] 7: Perform a casing voltage test on the repaired battery cell; the temperature and SOC of the specially made battery cell are within the specified range.

[0154] By cyclically charging and discharging, the potential of the casing is increased, preventing lithium ions from embedding inside the aluminum battery casing and causing electrochemical corrosion.

[0155] When the voltage difference between the battery casing and the negative electrode is less than 1.5V, corrosion has already begun to occur inside the battery casing. The casing needs to be repaired to prevent further corrosion from causing electrolyte leakage.

[0156] The casing repair method can be achieved by cyclically charging and discharging the third electrode and the negative electrode with a cyclic charging and discharging current of 0.33C. This rapidly increases the casing potential, thereby increasing the voltage difference between the casing and the negative electrode, slowing down the rate at which lithium ions embed into the aluminum battery casing, and preventing the electrochemical corrosion from worsening and causing leakage.

[0157] This slows down the rate at which lithium ions embed into the aluminum battery casing, reduces the rate at which lithium-aluminum alloy forms in the casing, prevents further corrosion and pulverization of the casing, and avoids exacerbating electrochemical corrosion and causing leakage.

[0158] To improve the corrosion repair effect of the casing, the electrolyte formulation is modified as follows: it is characterized by using high-purity lithium bisfluorosulfonylimide (LiFSI) with a concentration greater than 0.6 mol / L, and using dimethyl ether (DME) solvent to improve the solubility of lithium bisfluorosulfonylimide and other additives.

[0159] The battery is charged to a voltage greater than 4.2V to form an aluminum passivation layer, preventing further corrosion. This slows down the rate at which lithium ions embed into the aluminum battery casing, reduces the rate of lithium-aluminum alloy formation in the casing, and prevents further corrosion and pulverization of the casing, thus preventing accelerated electrochemical corrosion and subsequent leakage.

[0160] like Figure 7 As shown, the present invention also discloses electronic devices, storage media, and vehicles corresponding to the methods, systems, and devices for preventing electrochemical corrosion of lithium-ion power batteries:

[0161] An electronic device includes: a processor, a communication interface, a memory, and a communication bus, wherein,

[0162] The processor, communication interface, and memory communicate with each other via a communication bus; the memory stores a computer program, and when the computer program is executed by the processor, the processor performs the steps of the method for preventing electrochemical corrosion of lithium-ion power batteries.

[0163] A computer-readable storage medium storing a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of a method for preventing electrochemical corrosion of lithium-ion power batteries.

[0164] A vehicle, specifically comprising:

[0165] Electronic equipment for implementing electrochemical corrosion prevention methods for lithium-ion power batteries;

[0166] A processor that runs a program, which, when running, performs the steps of an anti-electrochemical corrosion method for lithium-ion power batteries in response to data output from the electronic device;

[0167] A storage medium for storing a program that, when running, performs the steps of an anti-electrochemical corrosion method for lithium-ion power batteries in response to data output from an electronic device.

[0168] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0169] The communication bus mentioned in the above electronic devices can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0170] The electronic device comprises a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on the operating system. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory. The operating system can be any one or more computer operating systems that control the electronic device through processes, such as Linux, Unix, Android, iOS, or Windows. Furthermore, in this embodiment of the invention, the electronic device can be a smartphone, tablet computer, or other handheld device, or a desktop computer, portable computer, or other electronic device; there is no particular limitation in this embodiment.

[0171] In this embodiment of the invention, the executing entity for electronic device control can be an electronic device itself, or a functional module within an electronic device capable of calling and executing a program. The electronic device can obtain the firmware corresponding to the storage medium. This firmware is provided by the supplier, and different storage media may have the same or different firmware; no limitation is made here. After obtaining the firmware corresponding to the storage medium, the electronic device can write this firmware into the storage medium; specifically, it burns the firmware corresponding to the storage medium into the storage medium. The process of burning the firmware into the storage medium can be implemented using existing technology, and will not be elaborated upon in this embodiment of the invention.

[0172] Electronic devices can also obtain reset commands corresponding to the storage media. The reset commands corresponding to the storage media are provided by the supplier. The reset commands corresponding to different storage media can be the same or different, and no restrictions are imposed here.

[0173] At this time, the storage medium of the electronic device is a storage medium on which the corresponding firmware has been written. The electronic device can respond to the reset command corresponding to the storage medium on which the corresponding firmware has been written, thereby resetting the storage medium on which the corresponding firmware has been written according to the reset command. The process of resetting the storage medium according to the reset command can be implemented by existing technology and will not be described in detail in this embodiment of the invention.

[0174] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0175] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0176] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0177] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the corresponding claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the corresponding claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0178] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.

[0179] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preventing electrochemical corrosion in lithium-ion power batteries, characterized in that, Specifically, it includes: The casing voltage of lithium-ion power batteries is detected based on time series data, and then fitted in two-dimensional spatial coordinates. The fitting results are compared with the preset casing voltage threshold to determine whether there are any abnormalities in the casing voltage of the lithium-ion power battery. Calculate the voltage change rate of lithium-ion power batteries to identify potential electrochemical corrosion risks; The voltage difference between the negative electrode and the casing of the lithium-ion power battery is calculated to obtain different corrosion risk zones; Based on the different corrosion risks, the voltage difference is divided into different corrosion risk zones, and corresponding anti-electrochemical corrosion strategies are adopted.

2. The method for preventing electrochemical corrosion of lithium-ion power batteries according to claim 1, characterized in that, The fitting in two-dimensional spatial coordinates specifically involves performing linear fitting on the coordinates of two-dimensional spatial points to obtain the corresponding fitted line. Based on the obtained fitted straight line, the slope of the fitted line is calculated to predict the rate of voltage drop of the lithium-ion power battery casing and the casing voltage at a specific time: If the rate of voltage drop in the casing exceeds the preset rate of voltage drop, the battery casing voltage is determined to be abnormal, and the battery may be at risk of electrochemical corrosion. If the casing voltage is less than the preset casing voltage threshold, the battery casing voltage is determined to be abnormal, and the battery casing has undergone electrochemical corrosion.

3. The method for preventing electrochemical corrosion of lithium-ion power batteries according to claim 1, characterized in that, Calculate the rate of change of voltage of all battery casings in the battery pack, and determine whether there is a risk of casing corrosion based on the rate of change. Calculate the voltage difference between the negative terminal of the battery and the battery casing, and determine whether there is a risk of corrosion based on the voltage difference; Based on the magnitude of the voltage difference, a decision is made as to whether it is necessary to test the battery's self-discharge rate in order to further analyze the corrosion risk.

4. The method for preventing electrochemical corrosion of lithium-ion power batteries according to claim 3, characterized in that, If the voltage difference between the negative terminal of the battery and the casing is less than 1.5V, the battery is considered to be at risk of corrosion. If the voltage difference between the negative terminal of the battery and the casing is greater than 3V, the battery is considered to have no risk of corrosion. If the voltage difference between the negative terminal of the battery and the casing is greater than or equal to 1.5V and less than or equal to 3V, the self-discharge rate of the battery is tested, and the voltage difference between each battery in the battery pack is also tested for further analysis of corrosion risk.

5. The method for preventing electrochemical corrosion of lithium-ion power batteries according to claim 4, characterized in that, If the voltage difference between the negative terminal of the battery and the casing is greater than or equal to 1.5V and less than or equal to 3V, the self-discharge rate of the battery is tested, and the voltage difference between each battery in the battery pack is also tested for further analysis of corrosion risk. Specifically: Manufacturing special battery cells: separately manufacturing battery cells with micro-short circuits between the negative electrode plate and the casing, the negative electrode tab and the casing, the negative electrode adapter plate and the casing, and the negative electrode post and the casing; Assemble special battery cells: Assemble special battery cells with normal battery cells to form battery packs, and conduct cycle and storage tests on the battery packs; Measuring the self-discharge rate of the specially designed battery cell: If the temperature and self-discharge rate of the specially designed battery cell are within the specified range, the self-discharge rate specification can be calculated. Calculate the cell voltage difference specifications within the battery pack: Measure the cell voltage difference within the battery pack. Assuming the temperature and state of charge (SOC) of the specially designed cells are within the specified range, calculate the cell voltage difference specifications within the battery pack. Recharging after cyclic charging and discharging: For battery cells that exceed specifications when the differential voltage and self-discharge rate are different, cyclic charging and discharging treatment is performed and then recharged. Casing repair treatment: For cells with a differential voltage greater than the cell differential voltage specification and a self-discharge rate greater than the self-discharge rate specification, casing repair treatment is performed; Repaired cell testing: The casing voltage of the repaired cell is tested, and the temperature and SOC of the specially made cell are within the specified range.

6. A system for preventing electrochemical corrosion in lithium-ion power batteries, characterized in that, Specifically, it includes: The battery casing voltage detection and fitting module is used to detect the casing voltage of lithium-ion power batteries based on time series and fit it in two-dimensional spatial coordinates. The fitting result comparison and judgment module is used to compare the fitting result with the preset casing voltage threshold to determine whether there is any abnormality in the change of the casing voltage of the lithium-ion power battery. The battery voltage change rate calculation module is used to calculate the voltage change rate of lithium-ion power batteries and identify potential electrochemical corrosion risks. The voltage difference calculation module between the negative electrode and the casing is used to calculate the voltage difference between the negative electrode and the casing of the lithium-ion power battery, and to obtain different corrosion risk areas. The electrochemical corrosion risk assessment implementation strategy module is used to divide the voltage difference into different corrosion risk areas according to different corrosion risks, and adopt corresponding electrochemical corrosion prevention strategies.

7. A device for preventing electrochemical corrosion in lithium-ion power batteries, the device being used to perform the steps of the method according to any one of claims 1 to 5, comprising a bare cell and a battery casing disposed outside the bare cell, a positive electrode post and a negative electrode post being mounted on one side of the battery casing, and an injection hole and an explosion-proof valve being disposed between the positive and negative electrode posts, characterized in that, It also includes a third terminal that is electrically connected to the battery casing and used for voltage sampling of the battery casing; The third terminal is used by the battery management system to sample the battery casing voltage in real time. The battery management system records the battery casing voltage and analyzes the detected battery casing voltage data to detect whether there is any overlap between the negative electrode plate and / or negative electrode tab and / or negative electrode adapter and / or negative terminal and the battery casing.

8. An electronic device, characterized in that, include: The system includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus; the memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the method according to any one of claims 1 to 5.

9. A computer-readable storage medium, characterized in that, It stores a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of the method according to any one of claims 1 to 5.

10. A vehicle, characterized in that, Specifically, it includes: An electronic device for implementing the method for preventing electrochemical corrosion of a lithium-ion power battery as described in any one of claims 1 to 5; A processor that runs a program that, when the program is running, performs the steps of the method for preventing electrochemical corrosion of a lithium-ion power battery according to any one of claims 1 to 5 on data output from the electronic device. A storage medium for storing a program that, when run, performs the steps of the method for preventing electrochemical corrosion of a lithium-ion power battery according to any one of claims 1 to 5 on data output from an electronic device.

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