Cell shell corrosion detection method, electronic equipment and storage medium

Abstract

The invention provides a shell corrosion detection method of a battery cell, electronic equipment and a storage medium, in the application, shell parameters of a shell of the battery cell in a charging and discharging process are monitored, the shell parameters comprise at least one of shell voltage, shell temperature and shell thickness, whether the shell is corroded or not is detected according to the shell parameters, and whether the shell is corroded or not is judged according to the shell parameters. Whether the shell is corroded or not can be detected, shell corrosion detection is simple and rapid, shell parameters can be obtained without implanting a copper wire into a battery cell to serve as a reference electrode, the real-time performance and convenience of monitoring are improved, meanwhile, manual operation is not needed, automatic shell parameter monitoring is achieved, and the detection efficiency is improved. And thus, the detection efficiency of corrosion detection on the shell of the battery cell is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a method for detecting shell corrosion of a battery cell, an electronic device and a storage medium. Background Art

[0002] The safety performance of lithium batteries has always been the primary concern of the industry. Batteries need to have extremely high safety guarantees in both static and dynamic conditions during long-term operation, which is a necessary condition for promoting the development of lithium batteries. However, there are many factors that lead to battery safety failure, among which the corrosion of the battery shell is an important factor leading to battery safety failure. Therefore, for long-cycle batteries, it is particularly important to monitor the corrosion of the battery aluminum shell in real time and identify the risk of battery safety failure in a timely manner.

[0003] To this end, in the related art, the battery status is generally detected by implanting a copper wire inside the battery cell as a reference electrode. However, this detection method has the following defects: on the one hand, the introduction of the copper wire cannot guarantee the airtightness of the battery; on the other hand, the copper wire requires frequent lithium plating and cannot meet the monitoring needs of the battery throughout its life cycle. This detection method is cumbersome and difficult to achieve automated detection. Summary of the invention

[0004] The embodiments of the present invention provide a method for detecting battery cell shell corrosion, an electronic device and a storage medium, which improve the technical problems in the related art that battery cell shell corrosion detection is complicated and has low detection efficiency.

[0005] In a first aspect, an embodiment of the present invention provides a method for detecting corrosion of a battery cell shell, the method comprising:

[0006] Monitoring shell parameters of the shell during the charging and discharging process of the battery cell, wherein the shell parameters include at least one of shell voltage, shell temperature and shell thickness;

[0007] Whether the shell is corroded is detected according to the shell parameters.

[0008] In one embodiment, monitoring the shell parameters of the shell of the battery cell during the charging and discharging process includes:

[0009] When the shell parameter is the shell voltage, monitoring a first voltage between the positive electrode column of the battery cell and the shell and a second voltage between the negative electrode column of the battery cell and the shell during the charging and discharging process of the battery cell; or,

[0010] A third voltage between the positive electrode column of the battery cell and the outer protective film surface of the shell is monitored during the charge and discharge process of the battery cell.

[0011] In one embodiment, the monitoring of the shell parameters of the shell of the battery cell during the charging and discharging process includes: when the shell parameter is the shell temperature, monitoring the first temperature of the positive electrode column of the battery cell, the second temperature of the negative electrode column of the battery cell and the third temperature of the large surface of the shell during the charging and discharging process of the battery cell.

[0012] In one embodiment, monitoring the shell parameters of the shell of the battery cell during the charging and discharging process includes: when the shell parameter is the shell thickness, monitoring a first thickness corresponding to at least one position in the large surface of the shell during the charging and discharging process of the battery cell.

[0013] In one embodiment, detecting whether the shell is corroded according to the shell parameters includes:

[0014] If the first voltage satisfies a first preset voltage threshold and the second voltage satisfies a second preset voltage threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded; or,

[0015] If the third voltage meets a third preset voltage threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

[0016] In one embodiment, detecting whether the shell is corroded according to the shell parameters includes:

[0017] If the first temperature satisfies a first preset temperature threshold, the second temperature satisfies a second preset temperature threshold, and the third temperature satisfies a third preset temperature threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

[0018] In one embodiment, detecting whether the shell is corroded according to the shell parameters includes:

[0019] If the first thickness meets a first preset thickness threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

[0020] In one embodiment, the monitoring of a first voltage between a positive electrode column of the battery cell and the shell and a second voltage between a negative electrode column of the battery cell and the shell during the charge and discharge process of the battery cell; or the monitoring of a third voltage between a positive electrode column of the battery cell and the outer protective film surface of the shell during the charge and discharge process of the battery cell, includes:

[0021] Monitoring a first potential at any position in the large surface of the shell, or at any position on the side or bottom of the outer side of the shell, or a second potential at any position on the outer protective film surface of the shell;

[0022] Monitoring a third electric potential corresponding to the positive electrode column, and monitoring a fourth electric potential corresponding to the negative electrode column;

[0023] The first voltage, the second voltage, and the third voltage are determined according to the first potential, the second potential, the third potential, and the fourth potential.

[0024] In a second aspect, an embodiment of the present invention provides a battery cell shell corrosion detection device, the battery cell shell corrosion detection device comprising:

[0025] A monitoring module, used to monitor shell parameters of the shell during the charging and discharging process of the battery cell;

[0026] The detection module is used to detect whether the shell is corroded according to the shell parameters.

[0027] In a third aspect, an embodiment of the present invention provides an electronic device, the electronic device comprising:

[0028] one or more processors;

[0029] Memory; and

[0030] One or more applications, wherein the one or more applications are stored in the memory and are configured to be executed by the processor to implement the steps in the battery cell shell corrosion detection method described in any one of the first aspects.

[0031] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is loaded by a processor to execute the steps in the battery cell shell corrosion detection method described in any one of the first aspects.

[0032] In a fifth aspect, the present application further provides a computer program product, comprising a computer program / instruction, which, when executed by a processor, is used to execute the steps in the battery cell shell corrosion detection method described in any one of the first aspects above.

[0033] Beneficial effects of the embodiments of the present invention:

[0034] In an embodiment of the present invention, by monitoring the shell parameters of the shell of the battery cell during the charging and discharging process, the shell parameters include at least one of the shell voltage, the shell temperature and the shell thickness, and detecting whether the shell is corroded according to the shell parameters. It is possible to detect whether the shell is corroded, and the shell corrosion detection is simple and fast. The monitoring of the shell parameters does not require the implantation of a copper wire as a reference electrode inside the battery cell for acquisition, thereby improving the real-time and convenience of the monitoring. At the same time, no manual operation is required, and automatic monitoring of the shell parameters is realized, thereby improving the detection efficiency of corrosion detection of the battery cell shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0036] Figure 1 It is a schematic flow chart of an embodiment of a method for detecting corrosion of a battery cell shell provided by an embodiment of the present invention;

[0037] Figure 2 It is a schematic diagram of the position of the sensor provided in the shell of the battery cell provided in the embodiment of the present application;

[0038] Figure 3 This is a schematic diagram of the position of the sensor disposed on the outer protective film of the shell of the battery cell provided in the embodiment of the present application;

[0039] Figure 4 It is a schematic structural diagram of an embodiment of a battery cell shell corrosion detection device provided in an embodiment of the present application;

[0040] Figure 5 It is a schematic diagram of the structure of an embodiment of an electronic device provided in the embodiments of the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0042] At present, in order to reduce the risk of battery safety failure, the battery status is generally detected by implanting copper wire inside the battery cell as a reference electrode. However, this detection method has the following defects: on the one hand, the introduction of copper wire cannot guarantee the airtightness of the battery; on the other hand, the copper wire requires frequent lithium plating and cannot meet the monitoring needs of the battery throughout its life cycle. This detection method is cumbersome and difficult to achieve automated detection.

[0043] In view of this, the present application proposes a method for detecting corrosion of a battery cell shell, an electronic device, and a computer storable medium to improve the detection efficiency of corrosion detection of a battery cell shell.

[0044] like Figure 1 As shown, it is a schematic diagram of an embodiment of the method for detecting the shell corrosion of the battery cell in the embodiment of the present application. The execution subject of the embodiment of the present application is an electrical device or a control module in the electrical device. The control module can be a battery management system (Battery Management System, BMS), a vehicle control unit (VCU), etc. The embodiment of the present application is described in detail by taking the execution subject as BMS as an example. The shell corrosion detection method of the battery cell includes:

[0045] 101. Monitor shell parameters of the shell of the battery cell during the charging and discharging process, where the shell parameters include at least one of shell voltage, shell temperature, and shell thickness.

[0046] The shell parameter is a parameter that characterizes the state of the shell of the battery cell, and may be one or a combination of shell voltage, shell temperature, and shell thickness.

[0047] The inventors found that the shell of the battery cell, under the chemical and electrochemical corrosion of the electrolyte and the accumulated electrode powder, will increase the probability of internal short circuit and electrolyte leakage of the battery, causing the shell to be corroded. At the same time, the shell parameters of the battery cell will change as the shell is corroded. Therefore, in the embodiment of the present application, the shell parameters of the shell of the battery cell during the charging and discharging process are monitored in real time, so that the shell parameters can be used to accurately detect whether the shell of the battery cell is corroded in real time.

[0048] Specifically, different types of sensors, such as potential sensors, temperature sensors or thickness sensors, can be attached to the shell of the battery cell to monitor the parameters of the state of the shell of the battery cell in real time. It can be understood that in this embodiment, the shell parameters of the shell are monitored in real time so that the shell can be subsequently detected based on the shell parameters to see if it is corroded. The monitoring of the shell parameters does not require the implantation of copper wire as a reference electrode inside the battery cell to obtain the shell parameters, which improves the real-time and convenience of the monitoring. At the same time, it does not require manual operation and realizes automatic monitoring of the shell parameters, which is conducive to the automatic detection of the shell corrosion of the battery cell.

[0049] In one embodiment, the monitoring of the shell parameters of the shell of the battery cell during the charging and discharging process includes: when the shell parameter is the shell voltage, monitoring the first voltage between the positive electrode column of the battery cell and the shell and the second voltage between the negative electrode column of the battery cell and the shell during the charging and discharging process of the battery cell; or, monitoring the third voltage between the positive electrode column of the battery cell and the outer protective film surface of the shell during the charging and discharging process of the battery cell.

[0050] The shell voltage may be a first voltage and a second voltage, or a third voltage. The first voltage refers to the voltage between the positive electrode of the battery cell and the shell, the second voltage refers to the voltage between the negative electrode of the battery cell and the shell, and the third voltage refers to the voltage between the positive electrode of the battery cell and the outer protective film surface of the shell.

[0051] The inventors discovered that when the shell of a battery cell is corroded, its outer protective film will show corrosion or cracking. Similarly, if the outer protective film of the shell of a battery cell shows corrosion or cracking, it indicates that the shell of the battery cell is corroded. At the same time, when the shell of the battery cell undergoes electrochemical corrosion, the voltage between the positive electrode column of the battery cell and the shell, the voltage between the negative electrode column of the battery cell and the shell will change, and the voltage between the positive electrode column of the battery cell and the surface of the outer protective film of the shell will also change. Therefore, in an embodiment of the present application, by monitoring the first voltage between the positive electrode column of the battery cell and the shell and the second voltage between the negative electrode column of the battery cell and the shell during the charging and discharging process of the battery cell; or, monitoring the third voltage between the positive electrode column of the battery cell and the surface of the outer protective film of the shell during the charging and discharging process of the battery cell, it is possible to subsequently determine whether the shell is corroded based on the first voltage and the second voltage, or the third voltage.

[0052] Specifically, a potential sensor can be set on the positive electrode column, negative electrode column, large surface of the shell, outer side, outer bottom, or outer protective film surface of the shell to monitor the first voltage, the second voltage or the third voltage in real time.

[0053] It should be noted that the large surface of the shell is the surface with the largest surface area, the outer side is the side surface of the large surface, and the outer side is the surface opposite to the large surface.

[0054] In one embodiment, the monitoring of the first voltage between the positive electrode column of the battery cell and the shell and the second voltage between the negative electrode column of the battery cell and the shell during the charge and discharge process of the battery cell; or, monitoring the third voltage between the positive electrode column of the battery cell and the outer protective film surface of the shell during the charge and discharge process of the battery cell, includes: monitoring a first potential at any position in the large surface of the shell, or at any position on the side or bottom of the outer side of the shell, or a second potential at any position on the outer protective film surface of the shell; monitoring the third potential corresponding to the positive electrode column, and monitoring the fourth potential corresponding to the negative electrode column; determining the first voltage, the second voltage and the third voltage according to the first potential, the second potential, the third potential and the fourth potential.

[0055] The first potential refers to the potential at any position on the large surface of the shell, or at any position on the side or bottom of the outer side of the shell. The second potential refers to the potential at any position on the outer protective film surface of the shell. The third potential refers to the potential corresponding to the positive pole, and the fourth potential refers to the potential corresponding to the negative pole.

[0056] Specifically, the absolute value of the difference between the first potential and the third potential can be determined as the first voltage, the absolute value of the difference between the first potential and the fourth potential can be determined as the second voltage, and the absolute value of the difference between the first potential and the second potential can be determined as the third voltage, thereby realizing real-time monitoring of the first voltage, the second voltage and the third voltage.

[0057] In one example, if Figure 2 The figure shows the position of the sensor in the shell of the battery cell. The potential sensors A1 and A2 are arranged on the positive pole and negative pole of the battery cell, and can be laser welded on the surface of the positive pole and negative pole to monitor the third potential and the fourth potential respectively.

[0058] Potential sensors A3, A4, and A5 are arranged on the large surface, outer side, and outer bottom of the shell, and can be attached to the large surface, outer side, and outer bottom of the shell with high-temperature insulating tape of size 30*30 (unit: mm), and are all used to monitor the first potential.

[0059] like Figure 3 The figure shows the position of the sensor on the outer protective film of the battery shell. The sensor A1 is arranged on the positive pole of the battery cell and can be welded to the surface of the positive pole by laser welding to monitor the third potential.

[0060] Sensors A6, A7, and A8 are placed on the large surface, outer side, and outer bottom of the outer protective film of the battery cell shell. They can be attached to the large surface, outer side, and outer bottom of the outer protective film of the shell with high-temperature insulating tape of size 30*30 (unit: mm), and are all used to monitor the second potential.

[0061] It can be understood that the above-mentioned method of real-time monitoring of the first voltage, the second voltage, and the third voltage is simple and efficient. There is no need to implant copper wire inside the battery cell as a reference electrode for acquisition, which improves the real-time and convenience of monitoring. At the same time, it does not require manual operation and realizes automatic monitoring of the shell voltage, which is conducive to the automatic detection of shell corrosion of the battery cell.

[0062] In one embodiment, the monitoring of the shell parameters of the shell of the battery cell during the charging and discharging process includes: when the shell parameter is the shell temperature, monitoring the first temperature of the positive electrode column of the battery cell, the second temperature of the negative electrode column of the battery cell and the third temperature of the large surface of the shell during the charging and discharging process of the battery cell.

[0063] The shell temperature may be a first temperature, a second temperature, and a third temperature. The first temperature refers to the temperature of the positive pole of the battery cell, the second temperature refers to the temperature of the negative pole of the battery cell, and the third temperature refers to the temperature of the large surface of the shell.

[0064] The inventors found that when there are other chemical and electrochemical reactions (side reactions) inside the battery cell, the temperature of the battery cell will rise rapidly and the aluminum shell will corrode. Therefore, when the shell of the battery cell undergoes electrochemical corrosion, the temperature of the positive pole of the battery cell, the negative pole of the battery cell, and the large surface of the shell will all change. Therefore, in the embodiment of the present application, by monitoring the first temperature of the positive pole of the battery cell, the second temperature of the negative pole of the battery cell, and the third temperature of the large surface of the shell during the charging and discharging process of the battery cell, it is possible to subsequently determine whether the shell is corroded based on the first temperature, the second temperature, and the third temperature.

[0065] Specifically, temperature sensors can be set on the positive electrode column, negative electrode column, large surface of the shell, outer side, outer bottom, or outer protective film surface of the shell to monitor the first temperature, second temperature and third temperature in real time.

[0066] It should be noted that the large surface of the shell is the surface with the largest surface area.

[0067] In one embodiment, monitoring the shell parameters of the shell of the battery cell during the charging and discharging process includes: when the shell parameter is the shell thickness, monitoring a first thickness corresponding to at least one position in the large surface of the shell during the charging and discharging process of the battery cell.

[0068] The shell thickness may be the thickness corresponding to at least one position in the large surface of the shell.

[0069] The inventors found that when other chemical and electrochemical reactions (side reactions) may occur inside the battery cell, gas may be generated inside the battery cell, which may cause the aluminum shell to rupture and corrode. Therefore, when the shell of the battery cell undergoes electrochemical corrosion, the thickness of the large surface of the shell will change. Therefore, in the embodiment of the present application, by monitoring the first thickness corresponding to at least one position in the large surface of the shell during the charging and discharging process of the battery cell, it is possible to subsequently determine whether the shell is corroded based on the first thickness.

[0070] Specifically, at least one thickness sensor may be disposed at at least one position of the large surface of the shell, and at least one thickness sensor may be disposed at at least one position of the surface opposite to the large surface, for real-time monitoring of the first thickness.

[0071] It should be noted that the large surface of the shell is the surface with the largest surface area.

[0072] 102. Detect whether the shell is corroded according to the shell parameters.

[0073] Specifically, a comparative analysis can be performed based on the threshold corresponding to the shell parameter and the shell parameter, and whether the shell is corroded can be determined based on the analysis result. It is understandable that, when the shell is corroded, its shell parameters will change to a certain extent. Therefore, the embodiment of the present application can detect whether the shell is corroded by real-time monitoring of the shell parameters and analyzing the shell parameters. The shell corrosion detection is simple and fast, and the monitoring of the shell parameters does not require the implantation of copper wire as a reference electrode inside the battery cell for acquisition, which improves the real-time and convenience of monitoring. At the same time, no manual operation is required, and automatic monitoring of the shell parameters is also realized, thereby improving the detection efficiency of corrosion detection of the battery cell shell.

[0074] In one embodiment, detecting whether the shell is corroded according to the shell parameters includes:

[0075] If the first voltage satisfies a first preset voltage threshold and the second voltage satisfies a second preset voltage threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded; or, if the third voltage satisfies a third preset voltage threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

[0076] The inventors found that when electrochemical corrosion occurs in the aluminum shell of the battery, it is specifically manifested as an increase in the voltage between the positive electrode column of the battery cell and the shell, a decrease in the voltage between the negative electrode column of the battery cell and the shell, or an increase in the voltage between the positive electrode column of the battery cell and the outer protective film surface of the shell. Therefore, in this embodiment, the first voltage, the second voltage, or the third voltage is compared and analyzed with the corresponding voltage threshold to determine whether the shell is corroded.

[0077] The first preset voltage threshold is a critical voltage of the voltage between the positive electrode of the battery cell and the shell when the shell is not corroded. Exemplarily, the first preset voltage threshold may be 1.7V to 3.5V.

[0078] The second preset voltage threshold is a critical voltage of the voltage between the negative electrode of the battery cell and the shell when the shell is not corroded. Exemplarily, the second preset voltage threshold may be 0V to 0.2V.

[0079] The third preset voltage threshold is a critical voltage of the voltage between the positive electrode of the battery cell and the outer protective film surface of the shell when the shell is not corroded. Exemplarily, the third preset voltage threshold may be 0V to 1V.

[0080] The first preset voltage threshold, the second preset voltage threshold and the third preset voltage threshold can be determined by empirical values ​​in actual applications.

[0081] Specifically, when the first voltage satisfies the first preset voltage threshold and the second voltage satisfies the second preset voltage threshold, it is determined that the shell is not corroded; when the first voltage or the second voltage is different and satisfies the corresponding voltage threshold, it is determined that the shell is corroded. It is also possible to judge whether the shell is corroded based on the third voltage and the corresponding voltage threshold, that is, when the third voltage satisfies the third preset voltage threshold, it is determined that the shell is not corroded; when the third voltage does not meet the third preset voltage threshold, it is determined that the shell is corroded. It can be understood that in this embodiment, the change characteristics of the shell voltage when the shell is not corroded and corroded are combined to detect whether the shell is corroded. The detection method is simple and fast, which improves the detection efficiency of shell corrosion detection.

[0082] In one example, when the first voltage is 1.9V and the second voltage is 0.1V, it is determined that corrosion exists on the housing.

[0083] In another example, when the third voltage is 1.8V, it is determined that corrosion exists on the housing.

[0084] In one embodiment, detecting whether the shell is corroded according to the shell parameters includes: if the first temperature meets a first preset temperature threshold, the second temperature meets a second preset temperature threshold, and the third temperature meets a third preset temperature threshold, determining that the shell is not corroded; otherwise, determining that the shell is corroded.

[0085] The inventors have found that when electrochemical corrosion occurs in the aluminum shell of the battery, it is specifically manifested as an increase in the temperature of the positive pole, the negative pole or the large surface of the shell of the battery. Therefore, in this embodiment, the first temperature, the second temperature or the third temperature is compared and analyzed with the corresponding temperature threshold to determine whether the shell is corroded.

[0086] The first preset temperature threshold is a critical temperature of the positive electrode column of the battery cell when the shell is not corroded. Exemplarily, the first preset temperature threshold may be 0°C to 40°C.

[0087] The second preset temperature threshold is a critical temperature of the negative electrode column of the battery cell when the shell is not corroded. Exemplarily, the second preset temperature threshold may be 0°C to 40°C.

[0088] The third preset temperature threshold is a critical temperature of the temperature of the large surface of the shell when the shell is not corroded. Exemplarily, the third preset temperature threshold may be 0°C to 45°C.

[0089] The first preset voltage threshold, the second preset voltage threshold and the third preset voltage threshold can be determined by empirical values ​​in actual applications.

[0090] Specifically, when the first temperature satisfies the first preset temperature threshold, the second temperature satisfies the second preset temperature threshold, and the third temperature satisfies the third preset temperature threshold, it is determined that the shell is not corroded. When the first temperature, the second temperature, and the third temperature are different and satisfy the corresponding voltage threshold, it is determined that the shell is corroded. It is also possible to judge whether the shell is corroded based on the third voltage and the corresponding voltage threshold, that is, when at least one of the first temperature, the second temperature, and the third temperature does not satisfy the corresponding temperature threshold, it is determined that the shell is corroded. It can be understood that in this embodiment, the shell temperature change characteristics when the shell is not corroded and corroded are combined to detect whether the shell is corroded. The detection method is simple and fast, which improves the detection efficiency of shell corrosion detection.

[0091] In one example, when the first temperature is 41° C., the second temperature is 41° C., and the third temperature is 46° C., it is determined that corrosion exists in the housing.

[0092] In one embodiment, detecting whether the shell is corroded according to the shell parameters includes: if the first thickness meets a first preset thickness threshold, determining that the shell is not corroded; otherwise, determining that the shell is corroded.

[0093] The inventors found that when the battery aluminum shell undergoes electrochemical corrosion, it is specifically manifested as an increase in the thickness of the large surface of the shell. Therefore, in this embodiment, the first thickness is compared and analyzed with the corresponding thickness threshold to determine whether the shell is corroded, and whether the shell is corroded can be detected. The shell corrosion detection is simple and fast, and the monitoring of the shell parameters does not require the implantation of copper wire as a reference electrode inside the battery cell for acquisition, which improves the real-time and convenience of monitoring. At the same time, no manual operation is required, and automatic monitoring of the shell parameters is also realized, thereby improving the detection efficiency of corrosion detection of the battery cell shell.

[0094] The first preset thickness threshold is a critical thickness of a large surface of the shell when the shell is not corroded. Exemplarily, the first preset temperature threshold may be 75 mm.

[0095] Specifically, when the first thickness meets the first preset thickness threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded. It can be understood that in this embodiment, the change characteristics of the shell thickness when the shell is not corroded and when it is corroded are combined to detect whether the shell is corroded. The detection method is simple and fast, which improves the detection efficiency of shell corrosion detection.

[0096] In one example, when the first thickness is 77 mm, it is determined that corrosion exists on the housing.

[0097] In another example, when the first thickness is 73 mm, it is determined that there is no corrosion on the housing.

[0098] The above-mentioned method for detecting shell corrosion of the battery cell monitors the shell parameters of the shell of the battery cell during the charging and discharging process, the shell parameters include at least one of the shell voltage, shell temperature and shell thickness, and detects whether the shell is corroded according to the shell parameters. The shell corrosion detection is simple and fast, and the monitoring of the shell parameters does not require the implantation of copper wire as a reference electrode inside the battery cell for acquisition, thereby improving the real-time and convenience of monitoring. At the same time, no manual operation is required, and automatic monitoring of the shell parameters is realized, thereby improving the detection efficiency of corrosion detection of the battery cell shell.

[0099] like Figure 4 As shown, the embodiment of the present application further provides a battery cell shell corrosion detection device 200, and the battery cell shell corrosion detection device 200 includes:

[0100] A monitoring module 201, used for monitoring the shell parameters of the shell of the battery cell during the charging and discharging process, wherein the shell parameters include at least one of shell voltage, shell temperature and shell thickness;

[0101] The detection module 202 is used to detect whether the shell is corroded according to the shell parameters.

[0102] In one embodiment, the monitoring module 201 is specifically used to monitor the shell parameter of the shell of the battery cell during the charging and discharging process: when the shell parameter is the shell voltage, monitor the first voltage between the positive electrode column of the battery cell and the shell and the second voltage between the negative electrode column of the battery cell and the shell during the charging and discharging process of the battery cell; or,

[0103] A third voltage between the positive electrode column of the battery cell and the outer protective film surface of the shell is monitored during the charge and discharge process of the battery cell.

[0104] In one embodiment, the monitoring module 201 is specifically used for:

[0105] When the shell parameter is the shell temperature, a first temperature of the positive electrode column of the battery cell, a second temperature of the negative electrode column of the battery cell, and a third temperature of the large surface of the shell are monitored during the charging and discharging process of the battery cell.

[0106] In one embodiment, the monitoring module 201 is specifically used for:

[0107] When the shell parameter is the shell thickness, a first thickness corresponding to at least one position in a large surface of the shell during the charge and discharge process of the battery cell is monitored.

[0108] In one embodiment, the detection module 202 is specifically used for:

[0109] If the first voltage satisfies a first preset voltage threshold and the second voltage satisfies a second preset voltage threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded; or,

[0110] If the third voltage meets a third preset voltage threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

[0111] In one embodiment, the detection module 202 is specifically used for:

[0112] If the first temperature satisfies a first preset temperature threshold, the second temperature satisfies a second preset temperature threshold, and the third temperature satisfies a third preset temperature threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

[0113] In one embodiment, the detection module 202 is specifically used for:

[0114] If the first thickness meets a first preset thickness threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

[0115] In one embodiment, the monitoring module 201 is further configured to:

[0116] Monitoring a first potential at any position in the large surface of the shell, or at any position on the side or bottom of the outer side of the shell, or a second potential at any position on the outer protective film surface of the shell;

[0117] Monitoring a third electric potential corresponding to the positive electrode column, and monitoring a fourth electric potential corresponding to the negative electrode column;

[0118] The first voltage, the second voltage, and the third voltage are determined according to the first potential, the second potential, the third potential, and the fourth potential.

[0119] The embodiment of the present application further provides an electronic device, which integrates any one of the battery cell shell corrosion detection devices provided in the embodiment of the present application, and the electronic device includes:

[0120] one or more processors;

[0121] Memory; and

[0122] One or more applications, wherein the one or more applications are stored in the memory and are configured to be executed by the processor according to the method for detecting corrosion of the battery cell shell described in any of the embodiments of the method for detecting corrosion of the battery cell shell.

[0123] The present application also provides an electronic device that integrates any of the battery cell shell corrosion detection devices provided in the present application. Figure 5 As shown, it shows a schematic diagram of the structure of the electronic device involved in the embodiment of the present application, specifically:

[0124] The electronic device may include components such as a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, and an input unit 304. Those skilled in the art will appreciate that Figure 5 The electronic device structure shown in the figure does not constitute a limitation of the electronic device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0125] in:

[0126] The processor 301 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, it executes various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 301.

[0127] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and data processing by running the software programs and modules stored in the memory 302. The memory 302 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 302 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 302 may also include a memory controller to provide the processor 301 with access to the memory 302.

[0128] The electronic device also includes a power supply 303 for supplying power to each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so that the power management system can manage charging, discharging, power consumption and other functions. The power supply 303 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators and other arbitrary components.

[0129] The electronic device may further include an input unit 304, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0130] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 301 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302, thereby realizing various functions, as follows: monitoring the shell parameters of the shell of the battery cell during the charging and discharging process, the shell parameters including at least one of the shell voltage, the shell temperature and the shell thickness; detecting whether the shell is corroded according to the shell parameters.

[0131] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0132] To this end, an embodiment of the present application provides a computer-readable storage medium, which may include: a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc. A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in any of the battery cell shell corrosion detection methods provided in the embodiments of the present application. For example, the computer program is loaded by a processor to execute the following steps: monitoring the shell parameters of the shell of the battery cell during the charging and discharging process, the shell parameters including at least one of the shell voltage, the shell temperature and the shell thickness; detecting whether the shell is corroded according to the shell parameters.

[0133] The embodiments of the present application also provide a computer program product, including a computer program / instruction, which, when executed by a processor, is used to execute the steps of any of the battery cell shell corrosion detection methods provided in the embodiments of the application.

[0134] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0135] In specific implementation, the above units or structures can be implemented as independent entities, or can be arbitrarily combined to be implemented as the same or several entities. The specific implementation of the above units or structures can refer to the previous method embodiments, which will not be repeated here.

[0136] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for detecting corrosion of a battery shell, characterized in that: The method comprises: Monitoring shell parameters of the shell during the charging and discharging process of the battery cell, wherein the shell parameters include at least one of shell voltage, shell temperature and shell thickness; Whether the shell is corroded is detected according to the shell parameters.

2. The method for detecting battery cell shell corrosion according to claim 1, characterized in that: The monitoring of the shell parameters of the shell of the battery cell during the charging and discharging process includes: When the shell parameter is the shell voltage, monitoring a first voltage between the positive electrode column of the battery cell and the shell and a second voltage between the negative electrode column of the battery cell and the shell during the charging and discharging process of the battery cell; or, A third voltage between the positive electrode column of the battery cell and the outer protective film surface of the shell is monitored during the charge and discharge process of the battery cell.

3. The method for detecting the corrosion of the battery shell according to claim 2, characterized in that: The monitoring of the shell parameters of the shell of the battery cell during the charging and discharging process includes: When the shell parameter is the shell temperature, a first temperature of the positive electrode column of the battery cell, a second temperature of the negative electrode column of the battery cell, and a third temperature of the large surface of the shell are monitored during the charging and discharging process of the battery cell.

4. The method for detecting shell corrosion of a battery cell according to claim 2, characterized in that: The monitoring of the shell parameters of the shell of the battery cell during the charging and discharging process includes: When the shell parameter is the shell thickness, a first thickness corresponding to at least one position in a large surface of the shell during the charge and discharge process of the battery cell is monitored.

5. The method for detecting battery cell shell corrosion according to claim 2, characterized in that: The detecting whether the shell is corroded according to the shell parameters includes: If the first voltage satisfies a first preset voltage threshold and the second voltage satisfies a second preset voltage threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded; or, If the third voltage meets a third preset voltage threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

6. The method for detecting battery cell shell corrosion according to claim 3, characterized in that: The detecting whether the shell is corroded according to the shell parameters includes: If the first temperature satisfies a first preset temperature threshold, the second temperature satisfies a second preset temperature threshold, and the third temperature satisfies a third preset temperature threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

7. The method for detecting battery cell shell corrosion according to claim 4, characterized in that: The detecting whether the shell is corroded according to the shell parameters includes: If the first thickness meets a first preset thickness threshold, it is determined that the shell is not corroded; otherwise, it is determined that the shell is corroded.

8. The method for detecting battery cell shell corrosion according to claim 2, characterized in that: The method of monitoring a first voltage between a positive electrode column of the battery cell and the shell and a second voltage between a negative electrode column of the battery cell and the shell during the charge and discharge process of the battery cell; or monitoring a third voltage between a positive electrode column of the battery cell and a surface of an outer protective film of the shell during the charge and discharge process of the battery cell, comprises: Monitoring a first potential at any position in the large surface of the shell, or at any position on the side or bottom of the outer side of the shell, or a second potential at any position on the outer protective film surface of the shell; Monitoring a third electric potential corresponding to the positive electrode column, and monitoring a fourth electric potential corresponding to the negative electrode column; The first voltage, the second voltage, and the third voltage are determined according to the first potential, the second potential, the third potential, and the fourth potential.

9. An electronic device, characterized in that: It comprises a memory and a processor; the memory stores an application program, and the processor is used to run the application program in the memory to execute the steps in the battery cell shell corrosion detection method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps in the battery cell shell corrosion detection method according to any one of claims 1 to 8.

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