Battery shell damage monitoring method, device, equipment, storage medium and product

Abstract

The invention relates to a battery shell damage monitoring method and device, equipment, a storage medium and a product, and the method comprises the steps: obtaining the current shell stress information of a target battery, and determining the shell damage monitoring result of the target battery according to the current shell stress information; wherein the current shell stress information is acquired through a sensor arranged on the shell of the target battery. According to the method, shell damage monitoring of the target battery can be realized.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery casing damage monitoring method, device, equipment, storage medium and product. Background Art

[0002] With the development of science and technology, batteries are used in more and more fields. In order to ensure the normal use of batteries, strict quality inspections must be carried out on the batteries.

[0003] Take the battery case as an example. If the battery case is damaged during operation, the battery performance will be reduced, thus affecting the battery life. Therefore, it is extremely necessary to monitor the battery case damage.

[0004] However, the related art lacks a method for monitoring battery casing damage. Summary of the invention

[0005] Based on this, it is necessary to provide a method, device, equipment, storage medium and product for monitoring battery shell damage in response to the above-mentioned technical problems, so as to monitor battery shell damage.

[0006] In a first aspect, an embodiment of the present application provides a battery casing damage monitoring method, the method comprising:

[0007] Acquire current shell force information of the target battery; the current shell force information is collected by a sensor disposed on the shell of the target battery;

[0008] According to the current shell force information, the shell damage monitoring result of the target battery is determined.

[0009] In the battery shell damage monitoring method provided in the embodiment of the present application, the current shell force information of the target battery is obtained, and the shell damage monitoring result of the target battery is determined based on the current shell force information; wherein, the current shell force information is collected by a sensor disposed on the shell of the target battery. In this method, since the sensor is directly disposed on the shell of the target battery, it is equivalent to that the current shell force information collected by the sensor is the information of the force currently applied to the shell of the target battery, so the current shell force information can accurately reflect the direct force conditions on the shell, so that based on this current shell force information, it is possible to accurately determine whether the shell of the target battery is damaged, thereby improving the accuracy of shell damage monitoring of the target battery.

[0010] In one embodiment, the sensor includes a first pressure sensor, and the first pressure sensor is disposed on an inner wall of a shell of a target battery; obtaining current shell force information of the target battery includes:

[0011] The current shell stress information of the target battery is collected through the first pressure sensor.

[0012] In the battery shell damage monitoring method provided in the embodiment of the present application, the sensor includes a first pressure sensor, and the current shell stress information of the target battery is collected through the first pressure sensor; wherein the first pressure sensor is arranged on the inner wall of the shell of the target battery. In this method, by arranging the first pressure sensor on the inner wall of the shell of the target battery, the first pressure sensor is arranged on the inner wall of the shell, and the first pressure sensor is deformed as the shell deforms, so that the first pressure sensor collects the stress information of the shell, and therefore, the internal force generated by the squeeze force of other batteries or objects in the outside world on the battery shell can be more accurately monitored, reducing the risk of distortion of the detected shell stress, thereby improving the accuracy and reliability of shell damage monitoring based on the shell stress information.

[0013] In one embodiment, the first pressure sensor includes a plurality of first pressure sensors, each of which is disposed at a different position of a welding heat-affected zone inside a shell of the target battery.

[0014] In the battery shell damage monitoring method provided in the embodiment of the present application, since the welding heat affected zone represents the area where the heat generated by the shell of the target battery during welding affects the surrounding materials, that is, the area that changes due to the influence of the welding heat, this area is affected by high temperature during the welding process, resulting in material changes, and the structural strength and rigidity are low. Therefore, multiple first pressure sensors are respectively arranged at different positions of the shell welding heat affected zone. The stress information of different positions of the shell welding heat affected zone can be collected by the first pressure sensors, so that the shell damage can be monitored more accurately.

[0015] In one embodiment, the sensor includes a second pressure sensor, and the second pressure sensor is attached to the outer surface of the shell of the target battery; obtaining the current shell force information of the target battery includes:

[0016] The current case pressure information of the target battery is collected through the second pressure sensor.

[0017] In the battery shell damage monitoring method provided in the embodiment of the present application, the sensor includes a second pressure sensor, and the current shell pressure information of the target battery is collected through the second pressure sensor; wherein the second pressure sensor is attached to the outer surface of the shell of the target battery. In this method, since the shell of the target battery is easily broken by the squeezing force of other batteries or objects in the outside world, the second pressure sensor is attached to the outer surface of the shell of the target battery, so that the second pressure sensor can more accurately monitor the pressure information on the outside of the shell of the target battery, thereby improving the accuracy of shell damage monitoring.

[0018] In one embodiment, the second pressure sensor is attached to the outer surface of the side surface of the shell of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the side surface of the shell.

[0019] In the embodiment of the present application, the second pressure sensor is attached to the outer surface of the shell side of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the shell side. In this method, by setting the second pressure sensor to be attached to the outer surface of the shell side of the target battery, the pressure information of the shell of the target battery can be accurately monitored; and the area of ​​the force sensing region of the second pressure sensor is set to be greater than or equal to the area of ​​the shell side, so that the second pressure sensor can collect the pressure information of the outer surface of the shell side and the welding area of ​​the shell top cover, so that the shell pressure information collected by the second pressure sensor is more comprehensive and accurate.

[0020] In one embodiment, determining the shell damage monitoring result of the target battery according to the current shell force information includes:

[0021] Determine the shell force rise rate of the target battery according to the current shell force information and the preset reference force information;

[0022] The shell damage monitoring result of the target battery is determined according to the shell force increase rate.

[0023] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell force rise rate of the target battery is determined based on the current shell force information and the preset reference force information, and the shell damage monitoring result of the target battery is determined based on the shell force rise rate. In this method, since the reference force information can represent the reference force information used when analyzing or evaluating the shell damage of the target battery, the shell force rise rate of the current shell force information of the target battery is calculated based on the reference force information, so that the shell force rise rate has reference value; therefore, the shell damage monitoring result of the target battery is determined based on the shell force rise rate, which improves the accuracy of the shell damage monitoring result of the target battery.

[0024] In one embodiment, the current shell force information includes current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery; according to the current shell force information and the preset reference force information, the shell force rise rate of the target battery is determined, including:

[0025] For the current shell stress information at any position in the welding heat affected zone, the shell stress rise rate at the position is determined according to the current shell stress information at the position and the preset reference stress information.

[0026] In the battery shell damage monitoring method provided in the embodiment of the present application, the current shell force information includes the current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery. For the current shell stress information at any position in the welding heat affected zone, the shell stress rise rate at the position is determined based on the current shell stress information at the position and the preset reference stress information. In this method, when the current shell force information includes the current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery, the shell stress rise rate at each position can be calculated based on the current shell stress information at different positions and the corresponding reference stress information, thereby improving the comprehensiveness of the subsequent determination of the shell damage monitoring results of the target battery.

[0027] In one embodiment, the current shell stress information at the position includes a plurality of stress values, and the shell stress rise rate at the position is determined according to the current shell stress information at the position and the preset reference stress information, including:

[0028] Obtain the maximum stress value among multiple stress values;

[0029] The shell stress rise rate at the location is determined based on the maximum stress value and the preset reference stress value.

[0030] In the battery shell damage monitoring method provided in the embodiment of the present application, the maximum stress value among multiple stress values ​​is obtained, and the shell stress rise rate at the position is determined according to the maximum stress value and the preset reference stress value. In this method, for the shell stress rise rate at any position, the shell stress rise rate is determined by the maximum stress value at the position, which can more accurately determine the stress degree of the shell, making the determined shell stress rise rate more accurate, thereby improving the timeliness of monitoring the shell damage of the target battery.

[0031] In one embodiment, the current shell stress information at the position includes a shell stress signal, and determining the shell stress rise rate at the position according to the current shell stress information at the position and preset reference stress information includes:

[0032] Transform the shell stress signal to obtain the shell frequency domain stress signal;

[0033] Determine the current shell stress root mean square value at the position according to the shell frequency domain stress signal;

[0034] The shell stress rise rate at the location is determined according to the current shell stress root mean square value at the location and a preset reference root mean square value.

[0035] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell stress signal is transformed and processed to obtain the shell frequency domain stress signal; the current shell stress root mean square value at the position is determined according to the shell frequency domain stress signal; the shell stress rise rate at the position is determined according to the current shell stress root mean square value at the position and the preset reference root mean square value. In this method, since the root mean square value can measure the energy or amplitude of the signal, the shell rise rate is determined by the current shell stress root mean square value, which can reflect the energy rise amplitude of the target battery shell, thereby improving the accuracy of the shell damage monitoring result determined by the shell stress rise rate.

[0036] In one embodiment, determining the shell damage monitoring result of the target battery according to the shell force increase rate includes:

[0037] Obtaining the shell stress rise rate at different positions in the welding heat affected zone inside the shell of the target battery;

[0038] The shell damage monitoring result of the target battery is determined according to the force increase rate of each shell.

[0039] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell force rise rate at different positions in the shell heat affected zone of the target battery is obtained, and the shell damage monitoring result of the target battery is determined based on each shell force rise rate. In this method, the shell damage monitoring result of the target battery is determined based on the shell force rise rate at multiple different positions, which improves the comprehensiveness of the shell force monitoring, thereby improving the accuracy of the shell damage monitoring result; and, the multiple different positions are all positions in the shell welding heat affected zone, thereby improving the accuracy of the shell damage monitoring of the target battery.

[0040] In one embodiment, determining the shell damage monitoring result of the target battery according to the force rise rate of each shell includes:

[0041] When there is a rise rate of the force on each shell that is greater than a preset rise rate threshold, determining that the shell damage monitoring result of the target battery is that the shell is damaged;

[0042] When the rising rates of the forces on each shell are less than or equal to the rising rate threshold, it is determined that the shell damage monitoring result of the target battery is that there is no damage to the shell.

[0043] In the battery shell damage monitoring method provided in the embodiment of the present application, when there is a case where the rise rate of force on each shell is greater than a preset rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is damaged; when the rise rate of force on each shell is less than or equal to the rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is not damaged. In this method, once there is a case where the shell force rise rate is greater than the rise rate threshold in each position of the shell welding heat affected zone of the target battery, it is directly determined that the shell of the target battery is damaged; otherwise, it is determined that the shell of the target battery is not damaged. In this way, the shell damage of the target battery can be discovered in time; and, by pre-setting a suitable rise rate threshold, the shell damage monitoring result is divided into two states: the shell is damaged and the shell is not damaged, which can simplify the analysis process, reduce the processing and analysis of a large amount of data, and reduce the influence of major factors, thereby improving the accuracy of the damage monitoring results.

[0044] In one embodiment, the current shell force information includes current shell pressure information at multiple local positions on the outer surface of the shell of the target battery; determining the shell force rise rate of the target battery according to the current shell force information and preset reference force information includes:

[0045] The force rise rate of the shell of the target battery is determined according to current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and preset reference pressure information.

[0046] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell force rise rate of the target battery is determined based on the current shell pressure information at multiple local positions on the shell outer surface of the target battery and the preset reference pressure information. In this method, the shell force rise rate of the target battery is determined based on the current shell pressure information at multiple local positions on the shell outer surface of the target battery, so that the shell force rise rate of the target battery obtained is more accurate.

[0047] In one embodiment, the current shell pressure information includes the current shell pressure; determining the shell force rise rate of the target battery according to the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and the preset reference pressure information, including:

[0048] For the current shell pressure at any local position on the outer surface of the shell, the shell pressure rising rate at the local position is determined according to the current shell pressure at the local position and a preset reference pressure.

[0049] In the battery shell damage monitoring method provided in the embodiment of the present application, for the current shell pressure at any local position on the outer surface of the shell, the shell pressure rise rate at the local position is determined according to the current shell pressure and the preset reference pressure. In this method, the current shell pressure at the local position represents the pressure situation at the local position and can reflect the pressure state at the position. Therefore, using the shell pressure rise rate at the local position as the shell force rise rate of the target battery can improve the accuracy of the shell damage monitoring result of the target battery.

[0050] In one embodiment, determining the shell damage monitoring result of the target battery according to the shell force increase rate includes:

[0051] Obtaining a shell pressure rise rate at multiple local positions on the outer surface of the shell of the target battery;

[0052] The shell damage monitoring result of the target battery is determined according to the pressure rise rate of each shell.

[0053] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell pressure rise rate at multiple local positions on the shell outer surface of the target battery is obtained, and the shell damage monitoring result of the target battery is determined according to each shell pressure rise rate. In this method, the shell damage monitoring result of the target battery is determined by the shell pressure rise rate at multiple local positions on the shell outer surface, which improves the comprehensiveness of the shell outer surface pressure monitoring, thereby improving the accuracy of the shell damage monitoring result.

[0054] In one embodiment, determining the shell damage monitoring result of the target battery according to the shell pressure rise rate includes:

[0055] When there is a case where the shell pressure rise rate is greater than a preset rise rate threshold, determining that the shell damage monitoring result of the target battery is that the shell is damaged;

[0056] When the rising rates of the shell pressures are all less than or equal to the rising rate threshold, it is determined that the shell damage monitoring result of the target battery is that there is no shell damage.

[0057] In the battery shell damage monitoring method provided in the embodiment of the present application, when there is a case where the shell pressure rise rate is greater than a preset rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is damaged; when the shell pressure rise rates are less than or equal to the rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is not damaged. In this method, once there is a case where the shell pressure rise rate is greater than the rise rate threshold at multiple local positions on the outer surface of the shell of the target battery, it is directly determined that the shell of the target battery is damaged; otherwise, it is determined that the shell of the target battery is not damaged. In this way, the shell damage of the target battery can be discovered in time; and, by pre-setting a suitable rise rate threshold, the shell damage monitoring result is divided into two states: the shell is damaged and the shell is not damaged, which can simplify the analysis process, reduce the processing and analysis of a large amount of data, and reduce the influence of major factors, thereby improving the accuracy of the damage monitoring results.

[0058] In one embodiment, determining the shell force rise rate of the target battery according to current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and preset reference pressure information includes:

[0059] Determine the total pressure of the outer surface of the shell of the target battery according to current shell pressure information at multiple local positions on the outer surface of the shell of the target battery;

[0060] The total pressure rise rate of the shell of the target battery is determined according to the total pressure on the outer surface of the shell and a preset reference total pressure.

[0061] In the battery shell damage monitoring method provided in the embodiment of the present application, the total pressure of the shell outer surface of the target battery is determined based on the current shell pressure information at multiple local positions on the shell outer surface of the target battery, and the total shell pressure rise rate of the target battery is determined based on the total pressure on the shell outer surface and the preset reference total pressure. In this method, since the total pressure on the shell outer surface of the target battery can represent the pressure on the entire shell of the target battery, the total shell pressure rise rate of the target battery can be determined based on the total pressure on the shell outer surface. Using the shell total pressure rise rate as the shell force rise rate of the target battery can improve the accuracy of shell damage monitoring of the target battery.

[0062] In one embodiment, determining the shell damage monitoring result of the target battery according to the shell force increase rate includes:

[0063] When the total shell pressure rise rate is greater than a preset rise rate threshold, determining that the shell damage monitoring result of the target battery is that the shell is damaged;

[0064] When the total shell pressure rising rate is less than or equal to the rising rate threshold, it is determined that the shell damage monitoring result of the target battery is that there is no shell damage.

[0065] In the battery shell damage monitoring method provided in the embodiment of the present application, when the total shell pressure rise rate is greater than the preset rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is damaged; when the total shell pressure rise rate is less than or equal to the rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is not damaged. In this method, once the total shell pressure rise rate of the target battery is greater than the rise rate threshold, it is determined that the shell of the target battery is damaged, otherwise, it is determined that the target battery is not damaged. In this way, the shell damage monitoring result of the target battery can be determined in a timely and rapid manner; and, the shell damage monitoring result of the target battery is divided according to the preset rise rate threshold, which can simplify the analysis process, reduce the processing and analysis of a large amount of data, and reduce the influence of major factors, thereby improving the accuracy of the damage monitoring results.

[0066] In one embodiment, the method further comprises:

[0067] When the shell damage monitoring result of the target battery indicates that the shell is damaged, determining the duration of the abnormality of the target battery according to the time when the shell of the target battery is damaged and the initial working time of the target battery;

[0068] The predicted life of the target battery is determined according to the duration of the abnormality of the target battery, the standard test duration, and the standard test life.

[0069] In the battery shell damage monitoring method provided in the embodiment of the present application, when the shell damage monitoring result of the target battery is that the shell is damaged, the duration of the target battery abnormality is determined based on the time when the shell of the target battery is damaged and the initial working time of the target battery, and then the predicted life of the target battery is determined based on the duration of the target battery abnormality, the standard test duration and the standard test life. In this method, the life of the target battery with shell damage is predicted through the standard test duration and the standard test life, which improves the reliability of the life prediction.

[0070] In one embodiment, the method further comprises:

[0071] Obtaining force information of multiple batteries in a battery module when the battery module is subjected to a vibration test;

[0072] The shell damage monitoring is performed on the battery whose stress information is greater than the preset stress threshold.

[0073] In the battery shell damage monitoring method provided in the embodiment of the present application, the force information of multiple batteries in the battery module is obtained when the battery module is subjected to a vibration test, and the shell damage monitoring is performed on the batteries whose force information is greater than the preset force threshold. In this method, by performing shell damage monitoring on the batteries in the battery module that are subjected to greater force, the reliability of the damage monitoring of the battery module is improved; and, only the batteries in the battery module that are subjected to greater force need to be monitored for damage, which reduces the workload of shell damage monitoring of all batteries in the battery module.

[0074] In a second aspect, an embodiment of the present application further provides a battery shell damage monitoring system, the system comprising: a sensor and a host computer; the sensor is arranged on the shell of the target battery, and the sensor is connected to the host computer;

[0075] The host computer is used to determine the shell damage monitoring result of the target battery according to the current shell force information of the target battery collected by the sensor.

[0076] In the battery shell damage monitoring system provided in the embodiment of the present application, the system includes: a sensor and a host computer; the sensor is arranged on the shell of the target battery, and the sensor is connected to the host computer; the host computer is used to determine the shell damage monitoring result of the target battery according to the current shell force information of the target battery collected by the sensor. In this system, since the sensor is directly arranged on the shell of the target battery, it is equivalent to that the current shell force information collected by the sensor is the information of the force currently applied to the shell of the target battery, so the current shell force information can accurately reflect the direct force condition on the shell, so that based on this current shell force information, it is possible to accurately determine whether the shell of the target battery is damaged, thereby improving the accuracy of shell damage monitoring of the target battery.

[0077] In one of the embodiments, the system further comprises a force acquisition unit, which is connected between the sensor and the host computer;

[0078] The force acquisition unit is used to obtain the current shell force information of the target battery collected by the sensor, process the current shell force information, and send the processed current shell force information to the host computer.

[0079] In the battery shell damage monitoring system provided in the embodiment of the present application, the system also includes a force acquisition unit, which is connected between the sensor and the host computer; the force acquisition unit is used to obtain the current shell force information of the target battery collected by the sensor, and process the current shell force information, and send the processed current shell force information to the host computer. In this system, before the host computer obtains the current shell force information of the target battery, the current shell force information collected by the sensor is processed by the force acquisition unit to improve the accuracy and reliability of the current shell force information, thereby improving the accuracy of the shell damage monitoring of the target battery.

[0080] In one embodiment, the sensor includes a plurality of first pressure sensors, each of which is respectively arranged at a different position of the welding heat-affected zone inside the shell of the target battery, and the axial direction of each first pressure sensor is parallel to the height direction of the shell; each first pressure sensor is connected to the force acquisition unit through a first acquisition line;

[0081] Each first pressure sensor is used to collect shell stress information at different positions of the welding heat affected zone inside the shell.

[0082] In the battery shell damage monitoring system provided in the embodiment of the present application, the sensor includes multiple first pressure sensors, each of which is respectively arranged at a different position of the welding heat affected zone inside the shell of the target battery, and the axial direction of each first pressure sensor is parallel to the height direction of the shell; each first pressure sensor is connected to the force acquisition unit through a first acquisition line; each first pressure sensor is used to collect shell stress information at different positions of the welding heat affected zone inside the shell. In the system, since the welding heat affected zone represents the area of ​​the shell of the target battery where the heat of welding affects the surrounding materials during welding, that is, the area that changes due to the influence of welding heat, this area is affected by high temperature during the welding process, resulting in changes in the material, and the structural strength and rigidity are low. Therefore, first pressure sensors are respectively set at multiple different positions in the shell welding heat affected zone, and stress information at multiple different positions in the shell welding heat affected zone can be collected through the first pressure sensor, so that the shell damage can be monitored more accurately; and, by making the axial direction of each first pressure sensor parallel to the height direction of the shell, the main force direction of the shell of the target battery, that is, the stress information perpendicular to the weld direction can be monitored, thereby realizing the monitoring of the stress information in the main force direction of the shell, thereby improving the accuracy of shell damage monitoring of the target battery.

[0083] In one embodiment, the different positions include a positive electrode column, a negative electrode column and a middle position in the width direction of the target battery corresponding to the shell of the target battery in the width direction.

[0084] In the battery shell damage monitoring system provided in the embodiment of the present application, different positions include the target battery shell corresponding to the positive pole, negative pole and the middle position in the width direction. In the system, by setting the first pressure sensor at the positive pole, negative pole and the middle position in the width direction corresponding to the welding heat affected zone of the target battery shell, the comprehensiveness and accuracy of the shell stress information collection are improved.

[0085] In one embodiment, each first pressure sensor includes an upper sealing film, a sensitive grid and a substrate pasted in sequence; the sensitive grid is connected to the first sensing lead through a contact; each first pressure sensor is pasted inside the shell of the target battery through the substrate, and is connected to the first acquisition line through the first sensing lead.

[0086] In the battery shell damage monitoring system provided by the embodiment of the present application, each first pressure sensor includes an upper sealing film, a sensitive grid and a substrate pasted in sequence; the sensitive grid is connected to the first sensing lead through a contact; each first pressure sensor is pasted to the inside of the shell of the target battery through the substrate, and is connected to the first acquisition line through the first sensing lead. In this system, by pasting the substrate of the first pressure sensor to the inside of the shell of the target battery, the problem of stress distortion caused by the squeezing force of other batteries or objects outside when pasting the first pressure sensor on the outside of the battery shell can be solved, so that the stress information collected by the first pressure sensor built into the shell is the stress information of the shell, thereby improving the accuracy and reliability of shell damage monitoring based on the shell stress information.

[0087] In one of the embodiments, the first sensing leads of each first pressure sensor are gathered together and led out from the top cover opening of the target battery; the lower surface of the top cover opening is sealed by a first sealant, and the upper surface of the top cover opening is sealed by a second sealant; the structural strength of the second sealant is greater than a preset strength threshold.

[0088] In the battery case damage monitoring system provided by the embodiment of the present application, the first sensing leads of each first pressure sensor are gathered and then led out from the top cover opening of the target battery; the lower surface of the top cover opening is sealed by a first sealant, and the upper surface of the top cover opening is sealed by a second sealant; the structural strength of the second sealant is greater than a preset strength threshold. In this system, the top cover opening from which the first sensing leads of each first pressure sensor are gathered is sealed by a sealant, thereby improving the sealing of the top cover opening and reducing the risk of electrolyte leakage from the top cover opening; and, a sealant with higher structural strength is used on the upper surface of the top cover opening to improve the structural strength of the upper surface of the top cover opening, thereby reducing the risk of the outer surface of the top cover opening cracking due to external pressure.

[0089] In one embodiment, the upper edge of each first pressure sensor is flush with the lower edge of the top cover of the target battery.

[0090] In the battery shell damage monitoring system provided by the embodiment of the present application, the upper edge of each first pressure sensor is flush with the lower edge of the top cover of the target battery. In the system, the upper edge of the first pressure sensor is set flush with the lower edge of the top cover of the target battery, so that inside the shell of the target battery, the first pressure sensor can accurately collect stress information of the shell welding heat affected zone, and the first pressure sensor will not interfere with the top cover of the target battery, thereby improving the accuracy of the first pressure sensor in collecting stress information.

[0091] In one embodiment, the sensor includes a second pressure sensor, which is attached to the outer surface of the shell of the target battery; the second pressure sensor is connected to the force acquisition unit through a second acquisition line;

[0092] The second pressure sensor is used to collect shell pressure information outside the shell.

[0093] In the battery shell damage monitoring system provided in the embodiment of the present application, the sensor includes a second pressure sensor, which is attached to the outer surface of the target battery; the second pressure sensor is connected to the force acquisition unit via a second acquisition line; the second pressure sensor is used to collect shell pressure information outside the shell. In this system, since the shell of the target battery is easily broken by the squeezing force of external objects or adjacent batteries, a second pressure sensor is set on the outer surface of the shell of the target battery, so that the second pressure sensor can more accurately collect the pressure information on the outside of the shell of the target battery, thereby realizing accurate monitoring of shell damage.

[0094] In one embodiment, the second pressure sensor is attached to the outer surface of the side surface of the shell of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the side surface of the shell.

[0095] In the battery shell damage monitoring system provided by the embodiment of the present application, the second pressure sensor is attached to the outer surface of the shell side of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the shell side. In this system, by setting the second pressure sensor attached to the outer surface of the shell side of the target battery, the pressure information of the shell of the target battery can be accurately collected; and the area of ​​the force sensing region of the second pressure sensor is set to be greater than or equal to the area of ​​the shell side, so that the second pressure sensor can collect the pressure information of the outer surface of the shell and the welding area of ​​the shell top cover, so that the shell pressure information collected by the second pressure sensor is more comprehensive.

[0096] In one of the embodiments, the second pressure sensor includes a first packaging flexible film, a first electrode, a second electrode, and a second packaging flexible film which are sequentially pasted; the first electrode and the second electrode are both connected to the conductive contact through a second sensing lead; the first electrode and the second electrode are both coated with a pressure-sensitive coating, and the first electrode and the second electrode are arranged crosswise; the second pressure sensor is pasted on the outer surface of the shell of the target battery through the second packaging flexible film, and is connected to the second acquisition line through a conductive contact.

[0097] In the battery shell damage monitoring system provided by the embodiment of the present application, the second pressure sensor includes a first packaging flexible film, a first electrode, a second electrode, and a second packaging flexible film which are sequentially pasted; the first electrode and the second electrode are connected to the conductive contact through the second sensing lead; the first electrode and the second electrode are coated with a pressure-sensitive coating, and the first electrode and the second electrode are arranged crosswise; the second pressure sensor is pasted on the outer surface of the shell of the target battery through the second packaging flexible film, and is connected to the second acquisition line through the conductive contact. In this system, the first electrode and the second electrode in the second pressure sensor are arranged crosswise, so that when the shell of the target battery is subjected to a squeezing force, the resistance at the intersection of the upper and lower layers of the pressure-sensitive coating changes due to deformation, and the resistance change is monitored by the force acquisition unit through the electrode connected to the pressure-sensitive coating, the second sensing lead, the contact and the second acquisition line, thereby improving the accuracy of the shell pressure monitoring; and the second pressure sensor is pasted on the outer surface of the shell of the target battery through the second packaging film, so that the second pressure sensor is fixed outside the shell and will not move during the test or use of the target battery, which will cause the shell damage monitoring result to be biased.

[0098] In a third aspect, the present application further provides a battery housing damage monitoring device, the device comprising:

[0099] An information acquisition module, used to acquire current shell force information of a target battery; the current shell force information is collected by a sensor disposed on the shell of the target battery;

[0100] The result determination module is used to determine the shell damage monitoring result of the target battery according to the current shell force information.

[0101] In a fourth aspect, an embodiment of the present application provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of any one of the methods provided in the embodiment of the first aspect are implemented.

[0102] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of any one of the methods provided in the embodiment of the first aspect above are implemented.

[0103] In a sixth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any one of the methods provided in the embodiments of the first aspect above.

[0104] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0105] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0106] Figure 1 A schematic diagram of the structure of a battery casing damage monitoring system in one embodiment;

[0107] Figure 2 A schematic diagram of the structure of a battery casing damage monitoring system in another embodiment;

[0108] Figure 3 A schematic diagram of the structure of a battery casing damage monitoring system in another embodiment;

[0109] Figure 4 A schematic diagram of the structure of a battery casing damage monitoring system in another embodiment;

[0110] Figure 5 It is a structural schematic diagram of a battery casing damage monitoring system in another embodiment;

[0111] Figure 6 A schematic diagram of the structure of a battery casing damage monitoring system in another embodiment;

[0112] Figure 7 A schematic diagram of the structure of a battery casing damage monitoring system in another embodiment;

[0113] Figure 8 It is a structural schematic diagram of a battery casing damage monitoring system in another embodiment;

[0114] Fig. 9 It is a structural schematic diagram of a battery casing damage monitoring system in another embodiment;

[0115] Fig.10 Schematic diagram of a process of a battery casing damage monitoring method in one embodiment;

[0116] Fig.11 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0117] Fig.12 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0118] Fig.13 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0119] Fig.14a A schematic diagram of changes in a shell frequency domain stress signal in one embodiment;

[0120] Fig.14b A schematic diagram of changes in a shell frequency domain stress signal in another embodiment;

[0121] Fig.14c A schematic diagram of changes in root mean square values ​​at multiple locations of a welding heat-affected zone inside a shell of a target battery in one embodiment;

[0122] Fig.15 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0123] Fig.16 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0124] Fig.17 A schematic diagram of pressure distribution of a shell of a target battery in one embodiment;

[0125] Fig.18 A schematic diagram of pressure distribution of a shell of a target battery in another embodiment;

[0126] Fig.19 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0127] Fig. 20 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0128] Fig.21 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0129] Fig. 22 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0130] Fig.23 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0131] Fig.24A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0132] Fig.25 A schematic diagram of the structure of a battery casing damage monitoring system in another embodiment;

[0133] Fig.26 A schematic diagram of a process of a battery casing damage monitoring method in another embodiment;

[0134] Fig. 27 is a structural block diagram of a battery casing damage monitoring device in one embodiment;

[0135] Fig.28 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0136] Fig.29 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0137] Fig.30 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0138] Fig.31 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0139] Fig.32 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0140] Fig.33 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0141] Fig.34 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0142] Fig.35 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0143] Fig.36 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0144] Fig.37 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0145] Fig.38 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0146] Fig.39 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0147] Fig.40 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0148] Fig.41 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0149] Fig.42 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0150] Fig.43 is a structural block diagram of a battery casing damage monitoring device in another embodiment;

[0151] Fig.44 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment.

[0152] The reference numerals in the specific implementation manner are as follows:

[0153] 100 battery casing damage monitoring system; 101 sensor;

[0154] 102 host computer; 103 housing of target battery;

[0155] 201 force acquisition unit; 301 first pressure sensor;

[0156] 302 first acquisition line; 401 positive electrode column;

[0157] 402 negative electrode column; 3011 upper sealing film;

[0158] 3012 sensitive gate; 3013 substrate;

[0159] 3014 contact; 3015 first sensing lead;

[0160] 601 top cover opening position; 701 second pressure sensor;

[0161] 702 second acquisition line; 7011 first packaging flexible film;

[0162] 7012 first electrode; 7013 second electrode;

[0163] 7014 a second packaging flexible film; 7015 a second sensing lead;

[0164] 7016 conductive contact; 901 explosion-proof valve;

[0165] 2501 vibration table; 2502 battery module;

[0166] 2503 shell of the middle battery; 2504 stress collection line;

[0167] 2505 Pressure acquisition line. DETAILED DESCRIPTION

[0168] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0169] Reference to "embodiment" in this document means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the term "including" and any variation thereof in the specification and claims of the present application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0170] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "and / or" is only a kind of association relationship describing the associated objects, indicating that there can be three relationships, such as A and / or B, which can be represented by: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). In the description of the embodiments of the present application, the orientation or position relationship indicated by the technical terms "upper", "lower", "horizontal", "inner", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0171] With the development of science and technology, batteries have gradually become an indispensable source of energy. However, during the use of batteries, there are potential safety hazards. For example, when the battery cells inside the battery expand or the battery outside is squeezed, the battery shell may rupture or leak. Therefore, it is extremely necessary to monitor the damage of the battery shell.

[0172] Based on this, an embodiment of the present application provides a battery shell damage monitoring method, in which a sensor is set on the shell of the target battery, and the current shell force information of the target battery is collected by the sensor set on the shell of the target battery, and the shell damage monitoring result of the target battery is determined based on the current shell force information. In such a battery shell damage monitoring method, since the sensor can collect information on the force applied to the shell of the target battery in real time, the shell of the target battery can be monitored for damage.

[0173] It should be understood that the technical effects that can be achieved by the battery shell damage monitoring method provided in the embodiment of the present application are not limited to this, and other technical effects can also be achieved. For example, the sensor in the embodiment of the present application automatically collects the current shell force information of the target battery, and can monitor the damage of the shell of the target battery in real time, thereby improving the real-time performance of the shell damage monitoring of the target battery, so as to quickly determine the damage to the shell of the target battery; and the sensor is arranged on the shell of the target battery, so that the collected current shell force information can accurately reflect the direct force on the shell, thereby improving the accuracy of damage monitoring of the target battery shell. The specific technical effects that can be achieved in the embodiment of the present application can be found in the following embodiments.

[0174] It should be noted that the battery casing damage monitoring solution provided in the embodiments of the present application is applicable to all new energy-related fields, including but not limited to batteries, battery modules, battery packs, etc. in new energy vehicles, energy storage and quick-change modules, and is not limited to this in the embodiments of the present application.

[0175] The battery involved in the embodiments of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships or aircraft.

[0176] The embodiment of the present application provides a battery shell damage monitoring method applied to the battery shell damage monitoring system provided in the embodiment of the present application, and the battery shell damage monitoring system is used to determine the shell damage monitoring result of the target battery based on the current shell force information of the target battery collected by the sensor. Among them, the battery shell damage monitoring system can be implemented in whole or in part through software, hardware and a combination thereof. Therefore, when describing the process of the battery shell damage monitoring method, the battery shell damage monitoring system provided in the embodiment of the present application is first described.

[0177] like Figure 1As shown, the system 100 includes: a sensor 101 and a host computer 102 ; the sensor 101 is disposed on a housing 103 of a target battery, and the sensor 101 is connected to the host computer 102 .

[0178] The host computer 102 is used to determine the shell damage monitoring result of the target battery according to the current shell force information of the target battery collected by the sensor 101.

[0179] The target battery may be any battery that requires shell damage monitoring, and the target battery may be a power battery; the target battery may be a single battery or a battery stored in a battery module or a battery pack.

[0180] The shell of the target battery refers to the outer shell of the battery. The target battery may include a battery cell and a shell; the shell may be an aluminum shell. The battery cell is usually placed inside the shell of the target battery. The battery cell is responsible for storing and releasing electrical energy, and the shell plays a role in protecting and supporting the battery cell. If the shell of the target battery is broken, the electrolyte of the target battery may flow out of the shell, resulting in a decrease in the performance or life of the target battery. Therefore, it is extremely important to monitor the shell of the target battery for damage. The shell of the target battery may be broken due to the influence of force, causing the battery shell to deform and thus be damaged.

[0181] Optionally, during the use of the target battery, the possible stress conditions of the target battery include: mechanical stress, thermal expansion, internal pressure, etc. Among them, mechanical stress includes the effects of mechanical impact, extrusion or bending on the shell of the target battery; thermal expansion includes the internal chemical reaction during the charge and discharge process of the target battery that generates heat, causing the shell of the target battery to expand thermally, and the thermal expansion may cause the shell to change in shape. If the shell cannot withstand the stress caused by the thermal expansion, it may cause the shell to rupture or deform, etc.; internal pressure includes the pressure of the internal gas or liquid generated by the target battery during the charge and discharge process. Therefore, the current shell force information of the target battery may include the pressure and / or stress on the shell of the target battery, etc.

[0182] Therefore, a sensor can be set on the shell of the target battery, and the current shell force information of the shell of the target battery can be collected by the sensor, and the collected current shell force information can be sent to a host computer connected to the sensor, and the host computer can analyze the current shell force information of the target battery to determine the shell damage monitoring result of the target battery. The host computer can be a computer device, a server, a controller, etc.

[0183] Optionally, the host computer can determine the shell damage monitoring result of the target battery according to a preset damage monitoring model; specifically, the current shell force information of the target battery is input into the damage monitoring model, and the current shell force information is analyzed by the damage monitoring model, and the damage monitoring model outputs the shell damage monitoring result of the target battery. Among them, the shell damage monitoring result of the target battery includes the damage type, damage location, damage degree, damage trend and safety assessment of the shell of the target battery; the damage type may include scratches, dents and cracks; the damage location may be the specific coordinates or area where the shell is damaged; the damage degree may be the degree of damage to the shell, for example, slight, moderate or severe; the damage trend may include the expansion or change of the shell damage, and the development trend of the shell damage of the target battery is predicted through the damage trend and the corresponding maintenance or replacement measures are collected; the safety assessment includes a safety assessment of the shell damage of the target battery to determine whether the shell damage will cause electrolyte leakage, battery short circuit and other safety problems.

[0184] In the battery shell damage monitoring system provided in the embodiment of the present application, the system includes: a sensor and a host computer; the sensor is arranged on the shell of the target battery, and the sensor is connected to the host computer; the host computer is used to determine the shell damage monitoring result of the target battery according to the current shell force information of the target battery collected by the sensor. In this system, since the sensor is directly arranged on the shell of the target battery, it is equivalent to that the current shell force information collected by the sensor is the information of the force currently applied to the shell of the target battery, so the current shell force information can accurately reflect the direct force condition on the shell, so that based on this current shell force information, it is possible to accurately determine whether the shell of the target battery is damaged, thereby improving the accuracy of shell damage monitoring of the target battery.

[0185] In one embodiment, Figure 2 As shown, the system 100 also includes a force acquisition unit 201, which is connected between the sensor 101 and the host computer 102; the force acquisition unit 201 is used to obtain the current shell force information of the target battery collected by the sensor 101, and process the current shell force information, and send the processed current shell force information to the host computer 102.

[0186] The force acquisition unit can be a device for collecting and measuring force information. It can include an information processing circuit and a data acquisition module. The sensor can be connected to the input end of the information processing circuit, the output end of the information processing circuit is connected to the input end of the data acquisition module, and the output end of the data acquisition module is connected to the host computer.

[0187] After the sensor senses the current shell force information of the target battery, it is processed by the information processing circuit and data acquisition module in the force acquisition unit, and the output end of the data acquisition module sends the processed current shell force information to the host computer.

[0188] Specifically, the sensor can collect an analog signal corresponding to the force applied to the shell of the target battery, the information processing circuit can amplify, filter and linearize the analog signal, the data acquisition module can convert the analog signal output by the information processing circuit into a digital signal, and send the digital signal as the current shell force information to the host computer; wherein the data acquisition module may include an analog-to-digital converter, etc.

[0189] Among them, in order to ensure that the force exerted on the battery during high-frequency vibration can be collected, the collection frequency of the force collection unit can be greater than a preset sampling frequency threshold. For example, the collection frequency of the force collection unit is greater than 200 Hz. By collecting the target battery at a collection frequency greater than 200 Hz, the real-time current shell force information is collected.

[0190] In the battery shell damage monitoring system provided in the embodiment of the present application, the system also includes a force acquisition unit, which is connected between the sensor and the host computer; the force acquisition unit is used to obtain the current shell force information of the target battery collected by the sensor, and process the current shell force information, and send the processed current shell force information to the host computer. In this system, before the host computer obtains the current shell force information of the target battery, the current shell force information collected by the sensor is processed by the force acquisition unit to improve the accuracy and reliability of the current shell force information, thereby improving the accuracy of the shell damage monitoring of the target battery.

[0191] The stress information of the shell of the target battery can be collected. Therefore, in one embodiment, Figure 3 As shown, the sensor 101 includes a plurality of first pressure sensors 301, each of which is respectively arranged at a different position of the welding heat affected zone inside the shell 103 of the target battery, and the axial direction of each first pressure sensor 301 is parallel to the height direction of the shell; each first pressure sensor is connected to the force acquisition unit 201 through a first acquisition line 302. Each first pressure sensor 301 is used to collect shell stress information at different positions of the welding heat affected zone inside the shell.

[0192] Among them, stress information may include stress and strain, wherein strain may indicate the degree of deformation of the shell under the action of external force, which may be the change per unit length or unit area; stress may include the force condition inside the shell, that is, the internal force generated by the interaction between the various parts of the shell when the shell is subjected to external force. Optionally, the relationship between stress and strain may be determined by the constitutive relationship of the material, and different materials have different stress-strain relationships. By measuring the strain information of the object and combining it with the constitutive relationship of the material, the stress distribution of the object can be inferred.

[0193] Therefore, the shell damage monitoring result of the target battery can be determined by the shell stress information. When collecting the shell stress information, the first pressure sensor can be set inside the shell to reduce the risk of inaccurate shell stress information due to deformation of the first pressure sensor itself under the action of external force.

[0194] The first pressure sensor may be a device capable of collecting stress information of an object, and the first pressure sensor may be a metal strain sensor; optionally, the first pressure sensor may be a strain gauge, and the strain gauge may be arranged inside the shell, and the first collection line is a stress collection line.

[0195] The welding heat affected zone refers to the area of ​​the shell of the target battery where the welding heat will affect the surrounding materials during the welding process, that is, the area that changes due to the welding heat.

[0196] Therefore, when the first pressure sensor is disposed inside the shell of the target battery, the first pressure sensor can be disposed in the welding heat affected zone inside the shell of the target battery to collect stress information of the welding heat affected zone inside the shell of the target battery.

[0197] A plurality of first pressure sensors may be arranged in the welding heat affected zone inside the shell of the target battery to collect shell stress information at a plurality of different positions in the heat affected zone inside the shell. Optionally, each first pressure sensor may be attached to a plurality of different positions in the welding heat affected zone inside the shell.

[0198] In one embodiment, Figure 4 As shown, the different positions include the positive electrode column 401, the negative electrode column 402 of the target battery corresponding to the shell of the target battery in the width direction and the middle position in the width direction.

[0199] The top cover of the target battery includes a positive column and a negative column. In order to improve the accuracy and comprehensiveness of the shell stress information collection, a first pressure sensor can be set at the middle position of the positive column, the negative column and the shell width direction of the target battery, that is, each first pressure sensor can be set at the middle position of the shell and the positive column, the negative column and the shell large surface width direction of the target battery. Among them, the shell large surface refers to the surface with the largest area of ​​the shell, and the shell large surface can be the front or back of the shell; the shell large surface is usually the main surface of the battery that contacts the outside, and it is affected by external pressure, temperature and other factors. Therefore, it is very important to monitor the damage of the shell large surface.

[0200] Optionally, the pasting position of the first pressure sensor in the width direction of the shell can also be determined according to simulation identification, and the first pressure sensor is pasted at a position with greater strain.

[0201] Each battery housing can be provided with at least 6 first pressure sensors, which are symmetrically arranged on the inner sides of the two large surfaces of the housing of the same target battery. Figure 4 Only positive and negative poles are included in this example. Please continue to refer to Figure 3 , Figure 3 The positions of the three first pressure sensors in the example on the inner wall of the large surface of the shell correspond to the positive pole, the negative pole and the middle position in the width direction of the large surface of the shell respectively.

[0202] In the battery shell damage monitoring system provided in the embodiment of the present application, different positions include the target battery shell corresponding to the positive pole, negative pole and the middle position in the width direction. In the system, by setting the first pressure sensor at the positive pole, negative pole and the middle position in the width direction corresponding to the welding heat affected zone of the target battery shell, the comprehensiveness and accuracy of the shell stress information collection are improved.

[0203] Optionally, the first pressure sensor can be a uniaxial first pressure sensor or a triaxial first pressure sensor, and when the first pressure sensor is pasted inside the shell of the target battery, the axial direction of the first pressure sensor needs to be along the shell height direction of the target battery, that is, regardless of whether the first pressure sensor is a uniaxial first pressure sensor or a triaxial first pressure sensor, the pasting direction of one axis must be along the shell height direction.

[0204] For example, the first pressure sensor is a strain gauge, which may be a uniaxial strain gauge or a triaxial strain gauge, and the gluing direction of at least one axis of the strain gauge is along the height direction of the shell.

[0205] The force collection unit collects shell stress information of the corresponding welding heat affected zone through a first pressure sensor arranged in the welding heat affected zone inside the shell of the target battery; specifically, when the shell is subjected to stress, the first pressure sensor will deform accordingly, and the first pressure sensor will feed back the stress generated by the deformation to the force collection unit through the first collection line, and the force collection unit will send the shell stress information collected by the first pressure sensor to the host computer.

[0206] Optionally, the force acquisition unit may include a stress acquisition unit, the first pressure sensors are connected to the stress acquisition unit via a stress acquisition line, the stress acquisition unit is connected to a host computer, and the stress acquisition unit transmits the shell stress information acquired by each first pressure sensor to the host computer.

[0207] In the battery shell damage monitoring system provided in the embodiment of the present application, the sensor includes multiple first pressure sensors, each of which is respectively arranged at a different position of the welding heat affected zone inside the shell of the target battery, and the axial direction of each first pressure sensor is parallel to the height direction of the shell; each first pressure sensor is connected to the force acquisition unit through a first acquisition line; each first pressure sensor is used to collect shell stress information at different positions of the welding heat affected zone inside the shell. In the system, since the welding heat affected zone represents the area of ​​the shell of the target battery where the heat of welding affects the surrounding materials during welding, that is, the area that changes due to the influence of welding heat, this area is affected by high temperature during the welding process, resulting in changes in the material, and the structural strength and rigidity are low. Therefore, first pressure sensors are respectively set at multiple different positions in the shell welding heat affected zone, and stress information at multiple different positions in the shell welding heat affected zone can be collected through the first pressure sensor, so that the shell damage can be monitored more accurately; and, by making the axial direction of each first pressure sensor parallel to the height direction of the shell, the main force direction of the shell of the target battery, that is, the stress information perpendicular to the weld direction can be monitored, thereby realizing the monitoring of the stress information in the main force direction of the shell, thereby improving the accuracy of shell damage monitoring of the target battery.

[0208] The specific structure of the first pressure sensor is described below by an embodiment. In one embodiment, Figure 5 As shown, each first pressure sensor 301 includes an upper sealing film 3011, a sensitive grid 3012 and a substrate 3013 pasted in sequence; the sensitive grid 3012 is connected to the first sensing lead 3015 through the contact 3014; each first pressure sensor 301 is pasted inside the shell 103 of the target battery through the substrate 3013, and is connected to the first acquisition line 302 through the first sensing lead 3015.

[0209] It should be noted that Figure 5Only the structure of a first pressure sensor is exemplified. Figure 5 The upper sealing film, the sensitive grid and the substrate are connected in sequence, the sensitive grid is connected to the first sensing lead through the contact, the first sensing lead is connected to the first acquisition line, and the substrate of the first pressure sensor is pasted inside the shell of the target battery.

[0210] The upper sealing film is a protective film of the first pressure sensor, which is used to protect the sensitive grid and the first sensing lead from external influences, wherein the material of the upper sealing film can be a material that does not affect the acquisition performance of the first pressure sensor and the performance of the battery cell, and the embodiment of the present application does not limit the material of the upper sealing film; the sensitive grid is the core part of the first pressure sensor, when the shell is subjected to stress, the sensitive grid is deformed, causing the resistance value of the sensitive grid to change, the sensitive grid is connected to the contact, and the stress information generated by the sensitive grid is transmitted through the first sensing lead connected to the contact; the substrate is the main part of the first pressure sensor, which is used to support the sensitive grid and the first sensing lead.

[0211] Optionally, before sticking the first pressure sensor to the large surface inside the shell of the target battery, the large surface inside the shell can be cleaned first, and then the substrate of the first pressure sensor can be stuck to the large surface inside the shell with special glue; the special glue can be any glue that does not affect the performance of the target battery.

[0212] In addition, the connection between the sensitive grid and the first sensing lead is sealed, that is, the contact at the connection between the sensitive grid and the first sensing lead is sealed by silicone to reduce the risk of electrolyte corroding the connection between the sensitive grid and the strain wire, thereby causing abnormal resistance of the first pressure sensor.

[0213] Optionally, when the first pressure sensor is a strain gauge, the first sensing lead may be a strain gauge lead.

[0214] In the battery shell damage monitoring system provided by the embodiment of the present application, each first pressure sensor includes an upper sealing film, a sensitive grid and a substrate pasted in sequence; the sensitive grid is connected to the first sensing lead through a contact; each first pressure sensor is pasted to the inside of the shell of the target battery through the substrate, and is connected to the first acquisition line through the first sensing lead. In this system, by pasting the substrate of the first pressure sensor to the inside of the shell of the target battery, the problem of stress distortion caused by the squeezing force of other batteries or objects outside when pasting the first pressure sensor on the outside of the battery shell can be solved, so that the stress information collected by the first pressure sensor built into the shell is the stress information of the shell, thereby improving the accuracy and reliability of shell damage monitoring based on the shell stress information.

[0215] In one embodiment, Figure 6As shown, the first sensing leads 3015 of each first pressure sensor 301 are gathered together and led out from the top cover opening position 601 of the target battery; the lower surface of the top cover opening position 601 is sealed by a first sealant, and the upper surface of the top cover opening position 601 is sealed by a second sealant; the structural strength of the second sealant is greater than a preset strength threshold.

[0216] After all the first sensing leads of the first pressure sensors are gathered in the target battery housing, they are led out from the top cover opening of the target battery. In addition, in order to improve the sealing performance of the top cover opening, after all the first sensing leads are gathered and led out from the top cover opening of the target battery, the lower surface of the top cover opening can be sealed with a first sealant, and the upper surface of the top cover opening can be sealed with a second sealant.

[0217] Among them, the first sealant and the second sealant are mainly used to seal the top cover opening to prevent the electrolyte from flowing out of the shell of the target battery; optionally, the first sealant can be a shadowless (UVglue, UV) glue, and the second sealant can be a two-component acrylic structural glue. In addition to the sealing function, the second sealant can also be selected with a structural strength greater than a preset strength threshold, so that the strength of the outside of the top cover opening is higher.

[0218] In the battery case damage monitoring system provided by the embodiment of the present application, the first sensing leads of each first pressure sensor are gathered and then led out from the top cover opening of the target battery; the lower surface of the top cover opening is sealed by a first sealant, and the upper surface of the top cover opening is sealed by a second sealant; the structural strength of the second sealant is greater than a preset strength threshold. In this system, the top cover opening from which the first sensing leads of each first pressure sensor are gathered is sealed by a sealant, thereby improving the sealing of the top cover opening and reducing the risk of electrolyte leakage from the top cover opening; and, a sealant with higher structural strength is used on the upper surface of the top cover opening to improve the structural strength of the upper surface of the top cover opening, thereby reducing the risk of the outer surface of the top cover opening cracking due to external pressure.

[0219] In one embodiment, an upper edge of each first pressure sensor is flush with a lower edge of a top cover of the target battery.

[0220] In order to avoid interference between the first pressure sensor and the top cover of the target battery, and the first pressure sensor does not affect the use of the battery cells in the target battery, the upper edge of each first pressure sensor can be flush with the lower edge of the top cover of the target battery; optionally, please continue to refer to Figure 6 , the upper edge of the first pressure sensor is flush with the lower edge of the top cover of the target battery, then the upper edge of the substrate of the first pressure sensor may be flush with the lower edge of the top cover of the target battery.

[0221] In the battery shell damage monitoring system provided by the embodiment of the present application, the upper edge of each first pressure sensor is flush with the lower edge of the top cover of the target battery. In the system, the upper edge of the first pressure sensor is set flush with the lower edge of the top cover of the target battery, so that inside the shell of the target battery, the first pressure sensor can accurately collect stress information of the shell welding heat affected zone, and the first pressure sensor will not interfere with the top cover of the target battery, thereby improving the accuracy of the first pressure sensor in collecting stress information.

[0222] In one embodiment, Figure 7 As shown, the sensor 101 includes a second pressure sensor 701, which is attached to the outer surface of the target battery 103; the second pressure sensor 701 is connected to the force acquisition unit 201 through a second acquisition line 702. The second pressure sensor 701 is used to collect shell pressure information outside the shell.

[0223] Among them, the pressure information may include the external squeezing force exerted on the object. Therefore, the shell pressure information of the shell of the target battery can be collected to determine the squeezing force exerted on the shell through the shell pressure information, and thus determine the shell damage monitoring result based on the shell pressure information.

[0224] Since the shell pressure information is the external squeezing force exerted on the shell, a second pressure sensor can be attached to the outer surface of the shell of the target battery. When the shell is subjected to pressure, the second pressure sensor will also be subjected to the same pressure. Therefore, by attaching the second pressure sensor to the outer surface of the shell of the target battery, the shell pressure information of the shell can be collected. Optionally, the second pressure sensor can be a thin film pressed sheet sensor, for example, the second pressure sensor is a flexible thin film pressure sensor; the second acquisition line can be a pressure acquisition line.

[0225] Furthermore, the second pressure sensor may be connected to the force acquisition unit via a second acquisition line, and the shell pressure information acquired by the second pressure sensor may be sent to the force acquisition unit.

[0226] in, Figure 7 Figure (a) shows the second pressure sensor. Figure 7 Figure (b) shows how the second pressure sensor is installed on the target battery and how it is connected to the force acquisition unit.

[0227] In one embodiment, the second pressure sensor is attached to the outer surface of the target battery in such a way that the second pressure sensor is attached to the outer surface of the side surface of the shell of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the side surface of the shell.

[0228] The battery shell includes two parts: an end face and a side face. The end face may include two parallel faces of the battery, namely, the top cover and the bottom, and may be the positive terminal face and the negative terminal face of the battery, namely, the end face of the battery includes the positive terminal and the negative terminal of the battery; the side face is the edge portion connecting the end faces. For example, taking the target battery as a cylindrical battery as an example, the side face of the cylindrical battery shell is cylindrical, and the second pressure sensor can be attached to the cylindrical outer surface of the cylindrical battery shell.

[0229] Take the target battery as a rectangular battery as an example, please continue to refer to Figure 7 The battery shell includes a top cover, a bottom and a side. The top cover can be a side including positive and negative poles, the bottom is a side parallel to the top cover, and the side is a side connecting the top cover and the bottom. The side of the target battery can include 4 sides. Therefore, the outer surface of the second pressure sensor pasted on the side of the shell of the target battery can be: the second pressure sensor can be pasted on the outer surface of the large surface of the shell, and the large surface of the shell is the side with the largest area among the side surfaces of the shell.

[0230] It should be noted that the shell of the rectangular battery includes two large surfaces, so the second pressure sensor can be attached to any one of the large surfaces, or there can be two second pressure sensors, each of which is attached to the two large surfaces of the shell.

[0231] Furthermore, the force sensing area of ​​the second pressure sensor may be an area where the second pressure sensor deforms under force, causing changes in electrical signals such as resistance, and the shell pressure information is obtained by collecting the electrical signals of the force sensing area under force. Therefore, the area of ​​the force sensing area of ​​the second pressure sensor is set to be greater than or equal to the area of ​​the side surface of the shell, so as to ensure that the second pressure sensor can cover the shell side surface of the target battery, the welding area between the shell top cover and the shell, and other positions.

[0232] It should be noted that by setting the area of ​​the force sensing region of the second pressure sensor to be greater than or equal to the area of ​​the side surface of the shell, the pressure on the shell of the target battery can be fully collected; wherein, Figure 7 The second pressure sensor can be connected to the sensor through a second acquisition line from a protruding portion of the second pressure sensor relative to the shell.

[0233] The second pressure sensor is attached to the outer surface of the large surface of the shell of the target battery, and can collect the shell pressure information of the large surface of the shell of the target battery; wherein the shell pressure information can be the pressure distribution information, local pressure information, overall pressure information, etc. of the shell of the target battery.

[0234] In the battery shell damage monitoring system provided by the embodiment of the present application, the second pressure sensor is attached to the outer surface of the shell side of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the shell side. In this system, by setting the second pressure sensor attached to the outer surface of the shell side of the target battery, the pressure information of the shell of the target battery can be accurately collected; and the area of ​​the force sensing region of the second pressure sensor is set to be greater than or equal to the area of ​​the shell side, so that the second pressure sensor can collect the pressure information of the outer surface of the shell and the welding area of ​​the shell top cover, so that the shell pressure information collected by the second pressure sensor is more comprehensive.

[0235] If the second pressure sensor attached to the outer surface of the shell of the target battery is subjected to pressure, it means that the shell of the target battery is subjected to pressure. That is, after the second pressure sensor of the target battery is subjected to pressure, pressure information will be collected and its pressure information will be sent to the host computer through the force collection unit as the shell pressure information of the target battery.

[0236] Optionally, the force acquisition unit may further include a pressure acquisition unit, the second pressure sensor is connected to the pressure acquisition unit via a second acquisition line, the pressure acquisition unit is connected to the host computer, and the pressure acquisition unit sends the shell pressure information acquired by the second pressure sensor to the host computer.

[0237] It should be noted that the second pressure sensor can be attached to both large surfaces on the outside of the shell of the target battery.

[0238] In the battery shell damage monitoring system provided in the embodiment of the present application, the sensor includes a second pressure sensor, which is attached to the outer surface of the target battery; the second pressure sensor is connected to the force acquisition unit via a second acquisition line; the second pressure sensor is used to collect shell pressure information outside the shell. In this system, since the shell of the target battery is easily broken by the squeezing force of external objects or adjacent batteries, a second pressure sensor is set on the outer surface of the shell of the target battery, so that the second pressure sensor can more accurately collect the pressure information on the outside of the shell of the target battery, thereby realizing accurate monitoring of shell damage.

[0239] The structure of the second pressure sensor is described in detail below through an embodiment. In one embodiment, Figure 8As shown, the second pressure sensor 701 includes a first packaging flexible film 7011, a first electrode 7012, a second electrode 7013 and a second packaging flexible film 7014 which are sequentially pasted; the first electrode 7012 and the second electrode 7013 are both connected to the conductive contact 7016 through the second sensing lead 7015; the first electrode 7012 and the second electrode 7013 are both coated with a pressure-sensitive coating, and the first electrode 7012 and the second electrode 7013 are arranged crosswise; the second pressure sensor 701 is pasted on the outer surface of the shell 103 of the target battery through the second packaging flexible film 7012, and is connected to the second acquisition line 702 through the conductive contact 7016.

[0240] Among them, the first packaging flexible film and the second packaging flexible film can be made of polyimide (PI) and polyethylene terephthalate (PET), and electrodes, second sensing leads and conductive contacts are pasted on the inner sides of the first packaging flexible film and the second packaging flexible film, and the second sensing leads and the conductive contacts are connected in sequence.

[0241] The first packaging flexible film, the first electrode, the second electrode and the second packaging flexible film are sequentially pasted; the second pressure sensor can be divided into two layers, for example, the first packaging flexible film and the first electrode are the upper layer, the second electrode and the second packaging flexible film are the lower layer, the first electrode and the second electrode are both coated with a pressure-sensitive coating, and the upper and lower layers of the pressure-sensitive coating are arranged crosswise, that is, when the first electrode and the second electrode are pasted, the first electrode and the second electrode are arranged crosswise. It should be noted that Figure 8 The (a) figure in the figure can be the upper layer, Figure 8 (b) in the figure can be the lower layer, and the first electrode in the upper layer and the second electrode in the lower layer are arranged crosswise to obtain a voltage sensor, that is, Figure 8 Figure (c) in .

[0242] Furthermore, the second pressure sensor is adhered to the outer surface of the shell side of the target battery through the outer side of the second packaging flexible film; optionally, a backing glue can be applied to the outer side of the second packaging flexible film and adhered to the outer surface of the shell side of the target battery.

[0243] In this way, when the second pressure sensor is squeezed by external force, the resistance at the intersection of the upper and lower pressure-sensitive coatings will change due to deformation. The resistance change can be monitored by the force acquisition unit through the electrodes connected to the pressure-sensitive coating, the second sensing leads and the conductive contacts.

[0244] Optionally, the pressure specification of the second pressure sensor needs to meet 1.5 times of the maximum pressure recognized during simulation, and usually needs to be no less than 2 MPa.

[0245] In the battery shell damage monitoring system provided by the embodiment of the present application, the second pressure sensor includes a first packaging flexible film, a first electrode, a second electrode, and a second packaging flexible film which are sequentially pasted; the first electrode and the second electrode are connected to the conductive contact through the second sensing lead; the first electrode and the second electrode are coated with a pressure-sensitive coating, and the first electrode and the second electrode are arranged crosswise; the second pressure sensor is pasted on the outer surface of the shell of the target battery through the second packaging flexible film, and is connected to the second acquisition line through the conductive contact. In this system, the first electrode and the second electrode in the second pressure sensor are arranged crosswise, so that when the shell of the target battery is subjected to a squeezing force, the resistance at the intersection of the upper and lower layers of the pressure-sensitive coating changes due to deformation, and the resistance change is monitored by the force acquisition unit through the electrode connected to the pressure-sensitive coating, the second sensing lead, the contact and the second acquisition line, thereby improving the accuracy of the shell pressure monitoring; and the second pressure sensor is pasted on the outer surface of the shell of the target battery through the second packaging film, so that the second pressure sensor is fixed outside the shell and will not move during the test or use of the target battery, which will cause the shell damage monitoring result to be biased.

[0246] In one embodiment, Fig. 9 As shown, the shell top cover of the target battery may include a positive pole 401, a negative pole 402, a top cover opening position 601 and an explosion-proof valve 901, wherein the first sensing leads of the first pressure sensors attached to the inner wall of the battery shell are gathered and led out from the top cover opening position 601, and the top cover opening position 601 may be the middle area between the top cover pole and the explosion-proof valve 901, that is, the top cover opening position may be the middle area between the positive pole 401 and the explosion-proof valve 901, or the middle area between the negative pole 402 and the explosion-proof valve 901. It should be noted that Fig. 9 The top cover opening position 601 is a schematic diagram of the middle position between the positive electrode column 401 and the explosion-proof valve 901.

[0247] It should be noted that the batteries in the embodiments of the present application are all exemplified in the shape of a rectangular parallelepiped. However, in actual applications, the batteries in the embodiments of the present application may also include but are not limited to shapes such as a cube and a cylinder.

[0248] Based on the same inventive concept, an embodiment of the present application also provides a battery shell damage monitoring method for implementing the above-mentioned battery shell damage monitoring system. The implementation solution to the problem provided by this method is similar to the implementation solution recorded in the above-mentioned system. Therefore, the specific limitations in one or more battery shell damage monitoring method embodiments provided below can be found in the above limitations on the battery shell damage monitoring system and will not be repeated here.

[0249] In one embodiment, a battery housing damage monitoring method is provided for application in Figure 1Taking the battery shell damage monitoring system in the embodiment as an example, this embodiment involves the specific process of determining the shell damage monitoring result of the target battery by collecting the current shell force information of the target battery through the sensor set on the shell of the target battery, such as Fig.10 As shown, this embodiment includes the following steps:

[0250] S1001, obtaining current shell force information of a target battery; the current shell force information is collected by a sensor disposed on the shell of the target battery.

[0251] The current shell force information may be the force information of the shell of the target battery at the current moment.

[0252] The sensor is arranged on the shell of the target battery. The sensor can collect the current shell force information of the target battery in real time, and send the current shell force information to the host computer after collecting the current shell force information.

[0253] Optionally, the host computer may send a collection instruction to the sensor. After the sensor responds to the collection instruction of the host computer, it collects the current shell force information of the target battery and sends the collected current shell force information to the host computer.

[0254] S1002: Determine the shell damage monitoring result of the target battery according to the current shell force information.

[0255] After obtaining the current shell force information of the target battery, the host computer can analyze the current shell force information to determine the shell damage monitoring result of the target battery.

[0256] In one embodiment, the shell damage monitoring result of the target battery can be directly determined based on the current shell force information, wherein the shell damage monitoring result of the target battery includes whether the shell is damaged or not damaged; for example, when the current shell force information of the target battery is greater than a preset force threshold, it means that the force on the shell of the target battery is large, and the shell damage monitoring result of the target battery is determined to be that the shell is damaged; when the shell damage monitoring result of the target battery is less than or equal to the force threshold, it means that the force on the shell of the target battery is not large, and the shell damage monitoring result of the target battery is determined to be that the shell is not damaged.

[0257] In the battery shell damage monitoring method provided in the embodiment of the present application, the current shell force information of the target battery is obtained, and the shell damage monitoring result of the target battery is determined based on the current shell force information; wherein, the current shell force information is collected by a sensor arranged on the shell of the target battery. In this method, since the sensor is directly arranged on the shell of the target battery, it is equivalent to that the current shell force information collected by the sensor is the information of the force currently applied to the shell of the target battery, so the current shell force information can accurately reflect the direct force condition on the shell, so that based on this current shell force information, it is possible to accurately determine whether the shell of the target battery is damaged, thereby improving the accuracy of shell damage monitoring of the target battery.

[0258] When the sensor includes a first pressure sensor, in one embodiment, the first pressure sensor is disposed on an inner wall of a shell of the target battery; obtaining current shell force information of the target battery includes: collecting current shell stress information of the target battery through the first pressure sensor.

[0259] The current shell stress information may include the stress to which the shell of the target battery is subjected at the current moment.

[0260] The first pressure sensor is arranged on the inner wall of the shell of the target battery, and the current shell stress information of the target battery is collected by the first pressure sensor. The first pressure sensor sends the collected current shell stress information to the host computer.

[0261] The method of collecting the current shell stress information of the target battery through the first pressure sensor can be that the first pressure sensor collects the current shell stress information of the target battery in real time, and the host computer can collect the current shell stress information of the target battery from the first pressure sensor according to a preset sampling frequency.

[0262] Optionally, the method of collecting the current shell stress information of the target battery through the first pressure sensor may also be that the host computer generates a shell stress information collection instruction of the target battery in response to the shell damage monitoring request of the target battery, and sends the shell stress information collection instruction to the first pressure sensor. After receiving the shell stress information collection instruction, the first pressure sensor collects the shell stress information of the target battery and sends the shell stress information as the current shell stress information to the host computer.

[0263] In order to improve the comprehensiveness of the target battery's current shell damage monitoring, in one embodiment, the first pressure sensor includes a plurality of first pressure sensors, each of which is respectively disposed at a different position of the welding heat affected zone inside the shell of the target battery.

[0264] The specific limitations in the embodiments of the present application are the same as those in the above embodiments, and the embodiments of the present application will not be repeated here.

[0265] In the battery shell damage monitoring method provided in the embodiment of the present application, since the welding heat affected zone represents the area where the heat generated by the shell of the target battery during welding affects the surrounding materials, that is, the area that changes due to the influence of the welding heat, this area is affected by high temperature during the welding process, resulting in material changes, and the structural strength and rigidity are low. Therefore, multiple first pressure sensors are respectively arranged at different positions of the shell welding heat affected zone. The stress information of different positions of the shell welding heat affected zone can be collected by the first pressure sensors, so that the shell damage can be monitored more accurately.

[0266] In the battery shell damage monitoring method provided in the embodiment of the present application, the sensor includes a first pressure sensor, and the current shell stress information of the target battery is collected through the first pressure sensor; wherein the first pressure sensor is arranged on the inner wall of the shell of the target battery. In this method, by arranging the first pressure sensor on the inner wall of the shell of the target battery, the first pressure sensor is arranged on the inner wall of the shell, and the first pressure sensor is deformed as the shell deforms, so that the first pressure sensor collects the stress information of the shell, and therefore, the internal force generated by the squeeze force of other batteries or objects in the outside world on the battery shell can be more accurately monitored, reducing the risk of distortion of the detected shell stress, thereby improving the accuracy and reliability of shell damage monitoring based on the shell stress information.

[0267] In one embodiment, the sensor includes a second pressure sensor attached to the outer surface of the shell of the target battery; obtaining the current shell force information of the target battery includes: collecting the current shell pressure information of the target battery through the second pressure sensor.

[0268] Among them, the current shell pressure information may include the pressure that the shell of the target battery is subjected to at the current moment, wherein the pressure may come from the squeezing force of other adjacent batteries or external objects outside the target battery, or the expansion pressure of the battery cells inside the target battery, etc.

[0269] The second pressure sensor is arranged outside the shell of the target battery, and the current shell pressure information of the target battery is collected by the second pressure sensor, and the second pressure sensor sends the current shell pressure information to the host computer.

[0270] The method of collecting the current shell pressure information of the target battery through the second pressure sensor can be that the second pressure sensor collects the current shell pressure information of the target battery in real time, and the host computer can collect the current shell pressure information of the target battery from the second pressure sensor according to a preset sampling frequency.

[0271] Optionally, the method of collecting the current shell pressure information of the target battery through the second pressure sensor may also be that the upper computer generates a shell pressure information collection instruction of the target battery in response to the shell damage monitoring request of the target battery, and sends the shell pressure information collection instruction to the second pressure sensor. After receiving the shell pressure information collection instruction, the second pressure sensor collects the shell pressure information of the target battery and sends the shell pressure information as the current shell pressure information to the upper computer.

[0272] In one embodiment, the second pressure sensor is attached to the outer surface of the side surface of the shell of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the side surface of the shell.

[0273] The specific limitations in the embodiments of the present application are the same as those in the above embodiments, and the embodiments of the present application will not be repeated here.

[0274] In the embodiment of the present application, the second pressure sensor is attached to the outer surface of the shell side of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the shell side. In this method, by setting the second pressure sensor attached to the outer surface of the shell side of the target battery, the pressure information of the shell of the target battery can be accurately monitored; and the area of ​​the force sensing region of the second pressure sensor is set to be greater than or equal to the area of ​​the shell side, so that the second pressure sensor can collect the pressure information of the outer surface of the shell and the welding area of ​​the shell top cover, so that the shell pressure information collected by the second pressure sensor is more comprehensive and accurate.

[0275] In the battery shell damage monitoring method provided in the embodiment of the present application, the sensor includes a second pressure sensor, and the current shell pressure information of the target battery is collected through the second pressure sensor; wherein the second pressure sensor is attached to the outer surface of the shell of the target battery. In this method, since the shell of the target battery is easily broken by the squeezing force of other batteries or objects in the outside world, a second pressure sensor is set on the outer surface of the shell of the target battery, so that the second pressure sensor can more accurately monitor the pressure information on the outside of the shell of the target battery, thereby improving the accuracy of shell damage monitoring.

[0276] In one embodiment, Fig.11 As shown, according to the current shell force information, determining the shell damage monitoring result of the target battery includes the following steps:

[0277] S1101, determining a shell force increase rate of a target battery according to current shell force information and preset reference force information.

[0278] Among them, the benchmark force information can be the reference force information used when analyzing or evaluating the shell damage of the target battery, and can be pre-set according to actual conditions or historical experience; the benchmark force information can also be the initial shell force information of the target battery in the initial state, and the initial state can be the shell force information of the target battery at the initial moment of experiment, test or use, where the initial moment can be 1 minute, 2 minutes or 5 minutes, that is, the benchmark force information can also be the shell force information of the target battery when the shell is experimented, tested or used for 1 minute.

[0279] The reference force information may include the type of force, the magnitude of the force, the position of the force, etc. Optionally, the reference force information may correspond to the current shell force information. For example, if the current shell force information includes the current stress value at position A, the reference force information may be the reference stress value at position A.

[0280] Therefore, the method for determining the shell force increase rate of the target battery can be calculated according to formula (1).

[0281]

[0282] Where K represents the force rise rate of the target battery shell, F t1 Indicates the current shell force information of the target battery, F t0 It represents the reference force information.

[0283] Optionally, the shell force rise rate of the target battery can also be determined according to a preset rise model; specifically, the current shell force information and the benchmark force information are input into the rise model, the current shell force information and the benchmark force information are analyzed by the rise model, and the shell force rise rate is output.

[0284] S1102, determining a shell damage monitoring result of the target battery according to the shell force increase rate.

[0285] The shell damage monitoring result of the target battery may include whether the shell of the target battery is damaged or not.

[0286] The method of determining the shell damage monitoring result of the target battery according to the shell force increase rate may be to compare the shell force increase rate with the increase rate threshold to determine the shell damage monitoring result of the target battery; for example, when the shell force increase rate is greater than the increase rate threshold, it means that the shell force of the target battery is large, and it is determined that the shell of the target battery is damaged; when the shell force increase rate is less than or equal to the increase rate threshold, it means that the shell force of the target battery is small, and it is determined that the shell of the target battery is not damaged. For example, the increase rate threshold may be 10%.

[0287] In another embodiment, the shell damage monitoring result can be determined according to a preset shell damage monitoring model; specifically, the shell force rise rate is input into the shell damage monitoring model, the shell force rise rate of the target battery is analyzed by the shell damage monitoring model, and the shell damage monitoring result of the target battery is output; wherein, the shell damage monitoring result includes whether the shell is damaged or not damaged.

[0288] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell force rise rate of the target battery is determined based on the current shell force information and the preset reference force information, and the shell damage monitoring result of the target battery is determined based on the shell force rise rate. In this method, since the reference force information can represent the reference force information used when analyzing or evaluating the shell damage of the target battery, the shell force rise rate of the current shell force information of the target battery is calculated based on the reference force information, so that the shell force rise rate has reference value; therefore, the shell damage monitoring result of the target battery is determined based on the shell force rise rate, which improves the accuracy of the shell damage monitoring result of the target battery.

[0289] If the current shell force information includes current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery, then in one embodiment, the shell force rise rate of the target battery is determined based on the current shell force information and the preset benchmark force information, including: for the current shell stress information at any position in the welding heat affected zone, the shell stress rise rate at the position is determined based on the current shell stress information at the position and the preset benchmark stress information.

[0290] Since multiple first pressure sensors can be set at different positions of the welding heat affected zone inside the shell of the target battery, the current shell force information of the target battery can include the current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery; the baseline force information can be the baseline stress information, and the shell force rise rate can be the shell stress rise rate.

[0291] Among them, the baseline stress information can be reference stress information pre-set according to actual conditions or historical experience; the baseline stress information can also be the initial shell stress information of the target battery shell in the initial state, for example, the baseline stress information can be the shell stress information of the target battery shell after 1 minute of use.

[0292] In this way, the shell stress rise rate at each position can be determined based on the current shell stress information at each position and the reference stress information at the corresponding position; it can be understood that the reference stress information corresponding to each first pressure sensor position can be the same or different.

[0293] For the current shell force information at any position, the shell stress rise rate at the position is determined according to the current shell stress information at the position and the reference stress information corresponding to the position. It can be understood that the method for calculating the shell stress rise rate at a certain position can be as shown in formula (1), and the embodiments of the present application will not be repeated here.

[0294] In the battery shell damage monitoring method provided in the embodiment of the present application, the current shell force information includes the current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery. For the current shell stress information at any position in the welding heat affected zone, the shell stress rise rate at the position is determined based on the current shell stress information at the position and the preset reference stress information. In this method, when the current shell force information includes the current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery, the shell stress rise rate at each position can be calculated based on the current shell stress information at different positions and the corresponding reference stress information, thereby improving the comprehensiveness of the subsequent determination of the shell damage monitoring results of the target battery.

[0295] In one embodiment, Fig.12 As shown, the current shell stress information at the position includes multiple stress values. According to the current shell stress information at the position and the preset reference stress information, the shell stress rise rate at the position is determined, including:

[0296] S1201, obtaining a maximum stress value among multiple stress values.

[0297] The current shell stress information at each first pressure sensor position includes multiple stress values.

[0298] Among them, multiple stress values ​​can be obtained from current shell stress information, and the current shell stress information can include a shell stress signal. The shell stress signal includes stress values ​​corresponding to multiple time points. The stress value corresponding to each time point in the shell stress signal can be directly determined as multiple stress values.

[0299] The maximum stress value is obtained from the multiple stress values, and the maximum stress value among the multiple stress values ​​is determined as the maximum stress value; wherein the maximum stress value may represent the maximum stress to which the shell of the target battery is subjected at the current moment.

[0300] S1202, determining the shell stress rise rate at the location according to the maximum stress value and the preset reference stress value.

[0301] According to the maximum stress value and the preset reference stress value, the shell stress rise rate at the position can be calculated by formula (1).

[0302] Optionally, the maximum stress value and the reference stress value at a position may be input into the rise model, and the maximum stress value and the reference stress value may be analyzed by the rise model to output the shell stress rise rate at the position.

[0303] In the battery shell damage monitoring method provided in the embodiment of the present application, the maximum stress value among multiple stress values ​​is obtained, and the shell stress rise rate at the position is determined according to the maximum stress value and the preset reference stress value. In this method, for the shell stress rise rate at any position, the shell stress rise rate is determined by the maximum stress value at the position, which can more accurately determine the stress degree of the shell, making the determined shell stress rise rate more accurate, thereby improving the timeliness of monitoring the shell damage of the target battery.

[0304] If the current shell stress information at the position includes a shell stress signal, then in one embodiment, Fig.13 As shown, according to the current shell stress information at the position and the preset reference stress information, determining the shell stress rise rate at the position includes the following steps:

[0305] S1301, transforming the shell stress signal to obtain a shell frequency domain stress signal.

[0306] The shell stress signal may be a time domain signal. Therefore, the shell stress signal may be subjected to signal transformation processing to obtain a frequency domain signal corresponding to the time domain signal, that is, a shell frequency domain stress signal.

[0307] Optionally, the transformation processing method may be Fourier transformation, that is, Fourier transformation is performed on the shell stress signal to obtain the shell frequency domain stress signal.

[0308] S1302, determining a current shell stress root mean square value at a position according to the shell frequency domain stress signal.

[0309] The root mean square value of the signal is a statistic of the signal amplitude, which can measure the energy or amplitude of the signal. Therefore, the root mean square value of the current shell stress at multiple different positions of the welding heat affected zone inside the shell of the target battery can be calculated.

[0310] For any position, the current shell stress root mean square value at the position can be calculated according to the shell frequency domain stress signal at the position.

[0311] Optionally, the current shell stress RMS value can be determined according to a preset RMS calculation model; specifically, the shell frequency domain stress signal is input into the RMS calculation model, and the shell frequency domain stress signal is analyzed by the RMS calculation model to output the shell stress RMS value.

[0312] like Figure 14a-Figure 14c As shown, Fig.14a It can be a shell frequency domain stress signal. Therefore, the method for determining the current shell stress root mean square value at the position can also be to calculate the area of ​​the shell frequency domain stress signal and the horizontal coordinate in the figure, and determine the value corresponding to the square root of the area as the current shell stress root mean square value corresponding to the shell frequency domain stress signal; wherein, Fig.14b The area of ​​region A in is the area of ​​the shell frequency domain stress signal and the horizontal axis; Fig.14c The root mean square value of the target battery shell internal welding heat affected zone at multiple locations can be represented by, where: Fig.14c Specifically includes the root mean square values ​​at 12 locations in the heat affected zone of the battery internal shell welding.

[0313] S1303, determining the shell stress rise rate at the location according to the current shell stress root mean square value at the location and a preset reference root mean square value.

[0314] The reference RMS value may be a standard RMS value at the location.

[0315] Based on formula (1), the shell stress rise rate at the location can be calculated according to the current shell stress root mean square value at the location and the preset reference root mean square value.

[0316] Optionally, the current shell stress RMS value and the benchmark RMS value at the position may be input into the rise model, and the current shell stress RMS value and the benchmark RMS value may be analyzed by the rise model to output the shell stress rise rate at the position.

[0317] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell stress signal is transformed and processed to obtain the shell frequency domain stress signal; the current shell stress root mean square value at the position is determined according to the shell frequency domain stress signal; the shell stress rise rate at the position is determined according to the current shell stress root mean square value at the position and the preset reference root mean square value. In this method, since the root mean square value can measure the energy or amplitude of the signal, the shell rise rate is determined by the current shell stress root mean square value, which can reflect the energy rise amplitude of the target battery shell, thereby improving the accuracy of the shell damage monitoring result determined by the shell stress rise rate.

[0318] Based on the above target battery shell stress rise rate, the following describes how to determine the target battery shell damage monitoring result through an embodiment. Fig.15 As shown, according to the shell force increase rate, the shell damage monitoring result of the target battery is determined, including:

[0319] S1501, obtaining the shell stress rise rate at different positions in the welding heat affected zone inside the shell of the target battery.

[0320] Based on the calculation method of the shell force increase rate at any position in the welding heat affected zone inside the shell of the above-mentioned target battery, the shell force increase rate at all different positions in the welding heat affected zone inside the shell of the target battery is obtained. The acquisition method is the same as that of the above-mentioned embodiment to obtain the shell force increase rate at any position, and the embodiments of the present application will not be repeated here.

[0321] S1502: Determine the shell damage monitoring result of the target battery according to the force increase rate of each shell.

[0322] The shell damage monitoring result of the target battery includes whether the shell of the target battery is damaged and the location of the damage, and whether the shell is not damaged.

[0323] In one embodiment, Fig.16 As shown, according to the force increase rate of each shell, the shell damage monitoring result of the target battery is determined, including the following steps:

[0324] S1601: When there is a rise rate of the force applied to each shell that is greater than a preset rise rate threshold, determine that the shell damage monitoring result of the target battery is that the shell is damaged.

[0325] When there is a rise rate of force on each shell that is greater than the rise rate threshold, it means that there is a location on the shell of the target battery that is subjected to greater force. Therefore, the shell damage monitoring result of the target battery can be determined as the presence of shell damage; further, the position of the shell welding heat affected zone corresponding to the shell force rise rate greater than the rise rate threshold can also be determined as the location where the shell is damaged.

[0326] S1602: When the force increase rates of each shell are less than or equal to the increase rate threshold, determine that the shell damage monitoring result of the target battery is that there is no shell damage.

[0327] When the force increase rates of each shell are less than or equal to the increase rate threshold, it means that the forces on the shell of the target battery are small, and it can be determined that the shell damage monitoring result of the target battery is that there is no damage to the shell.

[0328] In the battery shell damage monitoring method provided in the embodiment of the present application, when there is a case where the rise rate of force on each shell is greater than a preset rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is damaged; when the rise rate of force on each shell is less than or equal to the rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is not damaged. In this method, once there is a case where the shell force rise rate is greater than the rise rate threshold in each position of the shell welding heat affected zone of the target battery, it is directly determined that the shell of the target battery is damaged; otherwise, it is determined that the shell of the target battery is not damaged. In this way, the shell damage of the target battery can be discovered in time; and, by pre-setting a suitable rise rate threshold, the shell damage monitoring result is divided into two states: the shell is damaged and the shell is not damaged, which can simplify the analysis process, reduce the processing and analysis of a large amount of data, and reduce the influence of major factors, thereby improving the accuracy of the damage monitoring results.

[0329] Optionally, the shell damage monitoring result can be determined according to a preset shell damage monitoring model; specifically, the force rise rate of each shell is input into the shell damage monitoring model, and the shell damage monitoring model is used to analyze the force rise rate of each shell of the target battery, and the shell damage monitoring result of the target battery is output; wherein, the shell damage monitoring result may include the presence of damage to the shell and the location of the damage to the shell, or the absence of damage to the shell.

[0330] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell force rise rate at different positions in the shell heat affected zone of the target battery is obtained, and the shell damage monitoring result of the target battery is determined based on each shell force rise rate. In this method, the shell damage monitoring result of the target battery is determined based on the shell force rise rate at multiple different positions, which improves the comprehensiveness of the shell damage monitoring result; and the multiple different positions are all positions in the shell welding heat affected zone, thereby improving the accuracy of damage monitoring of the shell of the target battery.

[0331] In the case where the sensor is a second pressure sensor, the current shell force information includes current shell pressure information at multiple local positions on the outer surface of the shell of the target battery; then in one embodiment, the shell force rise rate of the target battery is determined based on the current shell force information and the preset benchmark force information, including: determining the shell force rise rate of the target battery based on the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and the preset benchmark pressure information.

[0332] The second pressure sensor is attached to the outer surface of the shell of the target battery, and can collect the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery; the current shell pressure information can represent the pressure information of the shell of the target battery at the current moment. The reference pressure information can be the reference pressure information pre-set according to the actual situation or historical experience; the reference pressure information can also be the initial shell pressure information of the shell of the target battery in the initial state, for example, the reference pressure information can be the shell pressure information of the shell of the target battery after 1 minute of use.

[0333] The method for determining the shell force increase rate of the target battery can be, for the current shell pressure information at any local position, according to the current shell pressure information at the local position and the corresponding reference pressure information at the local position, by formula (1) to calculate the shell force increase rate at the local position; wherein the shell force increase rate of the target battery can include the shell force increase rates at multiple local positions of the shell of the target battery.

[0334] The method for determining the shell force rise rate of the target battery may also be to input current shell pressure information and reference pressure information at multiple local positions on the shell outer surface of the target battery into the rise model to obtain the shell force rise rate of the target battery.

[0335] Optionally, the shell force increase rate of the target battery may also be an average value of the shell force increase rates at multiple local positions.

[0336] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell force rise rate of the target battery is determined based on the current shell pressure information at multiple local positions on the shell outer surface of the target battery and the preset reference pressure information. In this method, the shell force rise rate of the target battery is determined based on the current shell pressure information at multiple local positions on the shell outer surface of the target battery, so that the shell force rise rate of the target battery obtained is more accurate.

[0337] If the current shell pressure information includes the current shell pressure, then in one embodiment, the shell force rise rate of the target battery is determined based on the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and the preset reference pressure information, including: for the current shell pressure at any local position on the outer surface of the shell, the shell pressure rise rate at the local position is determined based on the current shell pressure and the preset reference pressure.

[0338] If the current shell pressure information includes the current shell pressure, the reference pressure information includes the reference pressure, and the shell force increase rate includes the shell pressure increase rate.

[0339] For the current shell pressure at any local position on the outer surface of the shell, the shell pressure rise rate at the local position can be calculated based on formula (1) according to the current shell pressure at the local position and the corresponding reference pressure.

[0340] like Fig.17 As shown, Fig.17 is the current pressure distribution on the outer surface of a shell of the target battery, where Fig.17 Figure (a) shows a two-dimensional schematic diagram of the pressure distribution of a shell. Fig.17 Figure (b) shows Fig.17 The three-dimensional schematic diagram corresponding to Figure (a) in Figure . Fig.18 As shown, Fig.18 is the current pressure distribution on the outer surface of another shell of the target battery, where Fig.18 Figure (a) shows another two-dimensional schematic diagram of the pressure distribution of the shell. Fig.18 Figure (b) shows Fig.18 In the three-dimensional schematic diagram corresponding to Figure (a), the area 1801 represents the pressure concentration area of ​​the shell of the target battery.

[0341] In the battery shell damage monitoring method provided in the embodiment of the present application, for the current shell pressure at any local position on the outer surface of the shell, the shell pressure rise rate at the local position is determined according to the current shell pressure and the preset reference pressure. In this method, the current shell pressure at the local position represents the pressure situation at the local position and can reflect the pressure state at the position. Therefore, using the shell pressure rise rate at the local position as the shell force rise rate of the target battery can improve the accuracy of the shell damage monitoring result of the target battery.

[0342] Further, based on the shell pressure rise rate at any of the above-mentioned local positions, the following is an example of how to determine the shell damage monitoring result of the target battery according to the shell pressure rise rate at multiple local positions; in one embodiment, Fig.19 As shown, according to the shell force increase rate, the shell damage monitoring result of the target battery is determined, including:

[0343] S1901, obtaining the shell pressure rising rate at multiple local positions on the outer surface of the shell of the target battery.

[0344] Based on the calculation method of the shell pressure rise rate at any local position on the outer surface of the shell of the target battery mentioned above, the shell pressure rise rate at multiple local positions on the outer surface of the shell of the target battery is obtained. The acquisition method is the same as that of obtaining the shell pressure rise rate at any local position in the above embodiment, and the embodiments of the present application will not be repeated here.

[0345] S1902, determining the shell damage monitoring result of the target battery according to the pressure increase rate of each shell.

[0346] The shell damage monitoring result of the target battery includes whether the shell of the target battery is damaged and the location of the damage, and whether the shell is not damaged.

[0347] Therefore, in one embodiment, if Fig. 20 As shown, according to the pressure rise rate of each shell, the shell damage monitoring result of the target battery is determined, including the following steps:

[0348] S2001: When there is a shell pressure rise rate greater than a preset rise rate threshold value among the shell pressure rise rates, determine that the shell damage monitoring result of the target battery is that the shell is damaged.

[0349] When there is a pressure rise rate greater than the rise rate threshold among each shell pressure rise rate, it means that there is a location on the shell of the target battery that is subjected to greater force. Therefore, the shell damage monitoring result of the target battery can be determined as the presence of shell damage; further, the position of the shell welding heat affected zone corresponding to the shell force rise rate greater than the rise rate threshold can also be determined as the location where the shell is damaged.

[0350] S2002: When the rising rates of the shell pressures are all less than or equal to the rising rate threshold, it is determined that the shell damage monitoring result of the target battery is that there is no shell damage.

[0351] When the rising rates of the shell pressures are all less than or equal to the rising rate threshold, it means that the shell forces of the target battery are all small, and it can be determined that the shell damage monitoring result of the target battery is that there is no shell damage.

[0352] In the battery shell damage monitoring method provided in the embodiment of the present application, when there is a case where the shell pressure rise rate is greater than a preset rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is damaged; when the shell pressure rise rates are less than or equal to the rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is not damaged. In this method, once there is a case where the shell pressure rise rate is greater than the rise rate threshold at multiple local positions on the outer surface of the shell of the target battery, it is directly determined that the shell of the target battery is damaged; otherwise, it is determined that the shell of the target battery is not damaged. In this way, the shell damage of the target battery can be discovered in time; and, by pre-setting a suitable rise rate threshold, the shell damage monitoring result is divided into two states: the shell is damaged and the shell is not damaged, which can simplify the analysis process, reduce the processing and analysis of a large amount of data, and reduce the influence of major factors, thereby improving the accuracy of the damage monitoring results.

[0353] Optionally, the shell damage monitoring result can be determined according to a preset shell damage monitoring model; specifically, each shell pressure rise rate is input into the shell damage monitoring model, and the shell damage monitoring model is used to analyze the shell pressure rise rates of the target battery, and the shell damage monitoring result of the target battery is output; wherein, the shell damage monitoring result may include the presence of damage to the shell and the location of the damage to the shell, or the absence of damage to the shell.

[0354] In the battery shell damage monitoring method provided in the embodiment of the present application, the shell pressure rise rate at multiple local positions on the shell outer surface of the target battery is obtained, and the shell damage monitoring result of the target battery is determined according to each shell pressure rise rate. In this method, the shell damage monitoring result of the target battery is determined by the shell pressure rise rate at multiple local positions on the shell outer surface, which improves the comprehensiveness of the shell outer surface pressure monitoring, thereby improving the accuracy of the shell damage monitoring result.

[0355] In one embodiment, Fig.21 As shown, according to the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and the preset reference pressure information, the shell force rise rate of the target battery is determined, including the following steps:

[0356] S2101 , determining a total pressure of an outer surface of a shell of a target battery according to current shell pressure information at a plurality of local positions on an outer surface of a shell of a target battery.

[0357] The total pressure on the outer surface of the shell of the target battery may include the total pressure on the shell of the target battery.

[0358] In one embodiment, the sum of current shell pressure information at multiple local positions on the shell outer surface of the target battery may be determined as the total pressure on the shell outer surface of the target battery.

[0359] In another embodiment, since the current shell pressure information represents the pressure information at a local position of the outer surface of the shell, the current shell pressure information at all positions of the outer surface of the shell of the target battery can be determined based on the current shell pressure information at all local positions, and then the sum of the current shell pressure information at all positions of the outer surface of the shell of the target battery is determined as the total pressure of the outer surface of the shell of the target battery.

[0360] Optionally, a method for determining the current shell pressure information at all positions of the outer surface of the shell of the target battery based on the current shell pressure information at all local positions may be, based on the current shell pressure information at the local position, determining that the pressure at a position within a preset distance range from the local position is also the current shell pressure information. Therefore, based on the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and the current shell pressure information at positions within a preset distance range from the multiple local positions, the current shell pressure information at all positions on the outer surface of the shell of the target battery is obtained.

[0361] In another embodiment, the total pressure on the outer surface of the shell of the target battery is determined according to a preset pressure calculation model; specifically, the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery is input into the pressure calculation model, and the current shell pressure information at multiple local positions is analyzed by the pressure calculation model to obtain the current shell pressure information at all positions on the outer surface of the shell of the target battery, and then the pressure calculation model outputs the total pressure on the outer surface of the shell of the target battery based on the current shell pressure information at all positions on the outer surface of the shell of the target battery.

[0362] S2102, determining a total pressure increase rate of the shell of the target battery according to the total pressure on the outer surface of the shell and a preset reference total pressure.

[0363] The total shell pressure increase rate of the target battery may represent the increase rate of the total pressure on the outer surface of the shell of the target battery at the current moment compared with the reference total pressure.

[0364] Based on formula (1), the total pressure on the outer surface of the shell and the preset reference total pressure can be used to determine the total shell pressure rise rate of the target battery, which is the same as the method for calculating the shell force rise rate in the above embodiment, and will not be repeated in detail in this embodiment of the present application.

[0365] In the battery shell damage monitoring method provided in the embodiment of the present application, the total pressure of the shell outer surface of the target battery is determined based on the current shell pressure information at multiple local positions on the shell outer surface of the target battery, and the total shell pressure rise rate of the target battery is determined based on the total pressure on the shell outer surface and the preset reference total pressure. In this method, since the total pressure on the shell outer surface of the target battery can represent the pressure on the entire shell of the target battery, the total shell pressure rise rate of the target battery can be determined based on the total pressure on the shell outer surface. Using the shell total pressure rise rate as the shell force rise rate of the target battery can improve the accuracy of shell damage monitoring of the target battery.

[0366] In the case where the shell force increase rate is the shell total pressure increase rate, the following is an example of how to determine the shell damage monitoring result of the target battery; in one embodiment, Fig. 22 As shown, according to the shell force increase rate, determining the shell damage monitoring result of the target battery includes the following steps:

[0367] S2201: When the total shell pressure rising rate is greater than a preset rising rate threshold, determine that the shell damage monitoring result of the target battery is that the shell is damaged.

[0368] S2202: When the total shell pressure rising rate is less than or equal to the rising rate threshold, determine that the shell damage monitoring result of the target battery is that the shell has no damage.

[0369] When the total shell pressure rise rate is greater than the rise rate threshold, it means that the outer surface of the shell of the target battery is subjected to greater force. Therefore, the shell damage monitoring result of the target battery can be determined as that the shell is damaged. When the total shell pressure rise rate is less than or equal to the rise rate threshold, it means that the outer surface of the shell of the target battery is subjected to less force. Therefore, the shell damage monitoring result of the target battery can be determined as that the shell is not damaged.

[0370] In the battery shell damage monitoring method provided in the embodiment of the present application, when the total shell pressure rise rate is greater than the preset rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is damaged; when the total shell pressure rise rate is less than or equal to the rise rate threshold, the shell damage monitoring result of the target battery is determined to be that the shell is not damaged. In this method, once the total shell pressure rise rate of the target battery is greater than the rise rate threshold, it is determined that the shell of the target battery is damaged, otherwise, it is determined that the target battery is not damaged. In this way, the shell damage monitoring result of the target battery can be determined in a timely and rapid manner; and, the shell damage monitoring result of the target battery is divided according to the preset rise rate threshold, which can simplify the analysis process, reduce the processing and analysis of a large amount of data, and reduce the influence of major factors, thereby improving the accuracy of the damage monitoring results.

[0371] When the shell of the target battery is detected to be damaged, the reliability life of the target battery can be predicted. In one embodiment, Fig.23 As shown, this embodiment includes the following steps:

[0372] S2301, when the shell damage monitoring result of the target battery is that the shell is damaged, determine the duration of the abnormality of the target battery according to the time when the shell of the target battery is damaged and the initial working time of the target battery.

[0373] The moment when the shell of the target battery is damaged is the moment when the shell of the target battery is monitored to be damaged. For example, if the target battery is monitored to be damaged at the current moment, the moment when the shell of the target battery is determined to be damaged is the current moment; the initial working moment of the target battery can be the moment when the target battery starts working, wherein the start of work can include the moment when charging, discharging or vibration starts.

[0374] Therefore, the duration between the initial operation time of the target battery and the time when the shell of the target battery is determined to be damaged can be determined as the duration of the abnormality of the target battery.

[0375] S2302, determining the predicted life of the target battery according to the duration of the abnormality of the target battery, the standard test duration and the standard test life.

[0376] Among them, the standard test duration refers to the time the battery is tested under standardized conditions, and the standard test life refers to the time the battery works normally within the standard test duration.

[0377] Therefore, the predicted life can be determined based on the standard test conditions and the duration of the abnormality, where the standard test conditions include the standard test duration and the standard test life, as shown in formula (2).

[0378]

[0379] Among them, L1 represents the predicted life of the target battery, H1 represents the duration of the target battery abnormality, H0 represents the standard test duration, and L0 represents the standard test life.

[0380] Optionally, if the target battery is in a battery module or a battery pack, the predicted life of the target battery may also be the predicted life of the battery module or battery pack to which it belongs.

[0381] In the battery shell damage monitoring method provided in the embodiment of the present application, when the shell damage monitoring result of the target battery is that the shell is damaged, the duration of the target battery abnormality is determined based on the time when the shell of the target battery is damaged and the initial working time of the target battery, and then the predicted life of the target battery is determined based on the duration of the target battery abnormality, the standard test duration and the standard test life. In this method, the life of the target battery with shell damage is predicted through the standard test duration and the standard test life, which improves the reliability of the life prediction.

[0382] When vibrating the battery module, the battery module may be simulated or experimentally determined first for the battery module for which the battery shell damage monitoring is required. In one embodiment, Fig.24 As shown, this embodiment includes the following steps:

[0383] S2401, obtaining force information of multiple batteries in the battery module when the battery module is subjected to a vibration test.

[0384] The vibration test of the battery module can be carried out by simulation or experiment.

[0385] When simulating a battery module, stress information of multiple batteries in the battery module may be obtained, and the stress information of the multiple batteries may be used as force information of the multiple batteries.

[0386] When conducting experiments on a battery module, accelerometers can be set at multiple battery positions and mounting points in the battery module, and acceleration signals at each position can be collected through each accelerometer. Then, the power spectral density (PSD) is calculated based on each acceleration signal. Then, the force information of each battery is determined based on the power spectral density of the multiple battery positions and mounting points. The force information represents the response of the battery, and the response size can be evaluated by the response magnification factor, as shown in formula (3).

[0387]

[0388] Among them, k represents the force information of the battery, W1 represents the power spectrum density of the battery position, and W0 represents the power spectrum density of the mounting point.

[0389] S2402: Perform shell damage monitoring on batteries whose force information is greater than a preset force threshold.

[0390] The battery whose force information is greater than the preset force threshold is determined as a monitoring object, and a first pressure sensor and an external second pressure sensor are built into the shell of the monitoring object to monitor the shell damage. The method of monitoring the shell damage object is the same as the above embodiment, and the embodiment of the present application will not be repeated here.

[0391] Optionally, the battery whose force information is greater than a preset force threshold may include one or more batteries, and shell damage monitoring may be performed on multiple batteries in the battery module.

[0392] In the battery shell damage monitoring method provided in the embodiment of the present application, the force information of multiple batteries in the battery module is obtained when the battery module is subjected to a vibration test, and the shell damage monitoring is performed on the batteries whose force information is greater than the preset force threshold. In this method, by performing shell damage monitoring on the batteries in the battery module that are subjected to greater force, the reliability of the damage monitoring of the battery module is improved; and, only the batteries in the battery module that are subjected to greater force need to be monitored for damage, which reduces the workload of shell damage monitoring of all batteries in the battery module.

[0393] In one embodiment, Fig.25 As shown, taking the first pressure sensor as a strain gauge, the second pressure sensor as a flexible film pressure sensor, the first acquisition line as a stress acquisition line, and the second acquisition line as a pressure acquisition line as an example for explanation, when the vibration table 2501 vibrates the battery module 2502, the battery in the middle of the battery module 2502 is selected as the monitoring object, and the shell 2503 of the middle battery has multiple strain gauges and an external flexible film pressure sensor built in; in addition, the host computer 102 and the force acquisition unit 201 are configured, and the strain gauges and the force acquisition unit 201 on the shell 2503 of the middle battery are connected through the stress acquisition line 2504, and the pressure sensor and the force acquisition unit 201 on the shell 2503 of the middle battery are connected through the pressure acquisition line 2505.

[0394] The force acquisition unit acquires the shell stress information of the shell of the middle battery through multiple strain gauges, and acquires the shell pressure information of the shell of the middle battery through a flexible film pressure sensor. The force acquisition unit sends the shell stress information and the shell pressure information to the host computer; the host computer 102 analyzes and processes the shell stress information and the shell pressure information to realize shell damage monitoring and reliability life prediction of the middle battery 2503 during the vibration of the battery module 2302.

[0395] It should be noted that the strain gauge is pasted inside the shell of the middle battery, and the pressure sensor is pasted on the outer surface of the side of the shell of the middle battery. The specific pasting method can refer to the above embodiment. Fig.25 No more indication.

[0396] Among them, the force collection unit can be set to have a sampling frequency greater than 200 Hz, so that the stress at the weak point of the heat-affected zone of the battery shell welding and the pressure between batteries can be collected when the battery vibrates at a high frequency (the frequency can be 5-200 Hz).

[0397] The host computer can be configured with data analysis software and automated analysis tools. Based on the data analysis software, the extrusion force distribution between adjacent battery shells can be analyzed according to the shell pressure information collected by the pressure sensor to determine the force concentration point. The overall extrusion force between adjacent battery shells can also be calculated. The extrusion force of local areas of the battery (for example, weak areas such as welds) can also be analyzed. The changes in pressure in various areas of the battery shell with vibration can also be monitored.

[0398] Based on the data analysis software, the stress conditions in the heat-affected area of ​​the battery casing can be analyzed, including the changes in stress with vibration (time domain changes), the changes in stress in the vibration frequency domain to determine the resonance point and the damage to the resonance point (frequency domain changes), and the overall damage of each strain gauge pasting position (RMS value).

[0399] Among them, the resonance point is the maximum peak point in the shell frequency domain stress signal, and the resonance point damage is the maximum peak in the shell frequency domain stress signal. The shell damage monitoring result of the target battery can also be determined based on the maximum peak value corresponding to different positions in the shell welding heat affected zone of the target battery and the preset amplitude threshold.

[0400] Specifically, when there is a value greater than the amplitude threshold among the maximum peaks, the shell damage monitoring result of the target battery is determined to be that the shell is damaged; when the maximum peaks are all less than or equal to the amplitude threshold, the shell damage monitoring result of the target battery is determined to be that the shell is not damaged.

[0401] The automated analysis tool monitors the damage to the battery shell in real time based on the stress information of the battery shell, and promptly detects failure risks such as shell cracking. If the battery shell is damaged, an early warning can be issued through the host computer, and the target battery can be repaired in time. In addition, when it is determined that the battery shell is damaged, the battery reliability life can also be evaluated and predicted.

[0402] Among them, the way of early warning through the host computer can be that the host computer can issue an early warning prompt, for example, the host computer directly displays "The battery shell is damaged, please repair" on the screen and emits a prompt sound of "The battery shell is damaged, please repair".

[0403] In one embodiment, the present application also provides a battery housing damage monitoring method. In the present application, the first pressure sensor is a strain gauge, and the second pressure sensor is a flexible film pressure sensor. The host computer is used as the execution subject for description. Fig.26 As shown, this embodiment includes the following steps:

[0404] S2601, obtaining, through a force acquisition unit, current shell force information of a target battery collected on a sensor disposed on the target battery; the sensor is a strain gauge and / or a flexible film pressure sensor.

[0405] Among them, multiple strain gauges are respectively pasted at multiple different positions of the welding heat affected zone on the inner wall of the shell of the target battery, the flexible film pressure sensor is pasted on the large surface of the shell of the target battery, and the area of ​​the force sensing area of ​​the flexible film pressure sensor is greater than or equal to the area of ​​the large surface of the shell of the target battery; the force acquisition unit includes a pressure acquisition unit and a stress acquisition unit, each strain gauge is connected to the host computer through the stress acquisition unit, and the flexible film pressure sensor is connected to the host computer through the pressure acquisition unit; the current shell force information represents the force information exerted on the shell of the target battery at the current moment.

[0406] The sampling frequency of the force acquisition unit may be greater than a preset sampling threshold, for example, the sampling frequency of the force acquisition unit may be greater than 200 Hz.

[0407] S2602, when a plurality of strain gauges are provided at a plurality of positions on the shell of the target battery, the current shell force information of the target battery includes the current shell stress information at the plurality of positions.

[0408] S2603: For any position, obtain the maximum stress value at the position from the current shell stress information at the position.

[0409] Among them, the current shell information can be a time domain signal corresponding to the shell stress, then the maximum stress value can be the maximum peak value of the stress signal; the current shell information can also be multiple sampled stress values, and the largest stress value among the multiple stress values ​​is determined as the maximum stress value.

[0410] S2604: Determine the shell force rise rate at the position according to the maximum stress value at the position and the preset reference stress value.

[0411] According to the same calculation method, the shell stress rise rate at each position in the welding heat affected zone of the inner wall of the shell of the target battery can be obtained.

[0412] S2605: For any position, calculate the root mean square value at the position according to the current shell force information at the position.

[0413] Among them, taking the time domain signal corresponding to the stress of the shell as the current shell force information as an example, the time domain signal at this position is Fourier transformed to obtain the frequency domain signal at this position, and the root mean square value corresponding to the frequency domain signal is used as the root mean square value at this position. Based on the same method, the root mean square value at each position in the welding heat affected zone of the inner wall of the shell of the target battery is calculated.

[0414] S2606, determining the shell force rise rate at each position of the shell of the target battery according to the RMS value at each position of the shell of the target battery and the corresponding reference RMS value.

[0415] S2607: When there is a rise rate of the force on each shell that is greater than a preset rise rate threshold, determine that the shell damage monitoring result of the target battery is that the shell is damaged.

[0416] S2608: When the rising rate of the force on each shell is less than or equal to the rising threshold, determine that the shell damage monitoring result of the target battery is that there is no damage to the shell.

[0417] S2609, when a flexible film pressure sensor is provided on the shell of the target battery, the current shell force information of the target battery includes pressure information of multiple local position areas of the shell.

[0418] S2610: Determine the shell pressure rising rate of each local position area according to the pressure information of each local position area and the reference pressure value of the corresponding local position area.

[0419] S2611: When there is a rise rate of each shell pressure that is greater than a preset rise rate threshold, determine that the shell damage monitoring result of the target battery is that the shell is damaged.

[0420] S2612: When the rising rates of the shell pressures are all less than or equal to the rising rate threshold, it is determined that the shell damage monitoring result of the target battery is that there is no shell damage.

[0421] S2613, determining a total pressure rise rate of the shell of the target battery according to the pressure information of multiple local position areas of the shell of the target battery.

[0422] Among them, according to the pressure information of multiple local position areas of the shell of the target battery, the total shell pressure of the target battery is first determined, and then the total shell pressure rise rate of the target battery is determined according to the total shell pressure of the target battery and the preset reference total pressure.

[0423] S2614: When the total shell pressure rising rate is greater than a preset rising rate threshold, determine that the shell damage monitoring result of the target battery is that the shell is damaged.

[0424] S2615: When the total shell pressure rising rate is less than or equal to the rising rate threshold, determine that the shell damage monitoring result of the target battery is that the shell has no damage.

[0425] Among them, when the shell damage monitoring result of the target battery is that the shell is damaged, the duration of the abnormality of the target battery shell can be determined according to the time when the shell of the target battery is damaged and the initial working time of the target battery; then, the predicted life of the target battery can be determined according to the duration of the abnormality of the shell of the target battery, the standard test life and the standard test time.

[0426] It should be noted that the host computer may include data analysis software and automated analysis tools, wherein the data analysis software can calculate the shell force increase rate of the target battery based on the current shell force information of the target battery, and the automated analysis tool can determine the shell damage monitoring result of the target battery based on the shell force increase rate of the target battery.

[0427] In the embodiment of the present application, according to the built-in strain gauge and the external flexible film pressure sensor of the shell of the target battery, as well as the force acquisition unit and the host computer, the stress information and pressure information of the shell of the target battery during vibration, charge and discharge test or use of the target battery can be obtained, and the shell of the target battery can be monitored for damage through the stress information and pressure information; and the strain gauge is built into multiple positions of the welding heat affected zone inside the shell of the target battery, so that the stress information collected by the strain gauge is the stress information in the welding heat affected zone inside the shell, reducing the risk of stress distortion and improving the accuracy of the collected stress information; the flexible film pressure sensor is set on the outer surface of the shell, so that the pressure information collected by the flexible film pressure sensor is the pressure information of the shell of the target battery, which improves the accuracy of the pressure information; according to the accurate stress information and pressure information, the shell of the target battery can be more accurately monitored for damage, which improves the accuracy of damage monitoring of the shell of the target battery.

[0428] In addition, the embodiment of the present application is also equipped with a high-frequency force acquisition unit, which can accurately monitor the shell force information of the target battery when the target battery undergoes high-frequency vibration; in addition, the stress acquisition unit and the pressure acquisition unit of the strain gauge and the flexible film pressure sensor are integrated to realize the automatic collection of the total pressure of the battery shell, local pressure, shell surface pressure distribution, stress at multiple positions inside the shell, etc., and configure data analysis software and automated analysis tools to monitor the damage of the target battery shell in real time and make accurate predictions of its reliability life.

[0429] The specific limitations in the embodiments of the present application are the same as those in the above embodiments and will not be repeated here.

[0430] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0431] Based on the same inventive concept, the embodiment of the present application also provides a battery shell damage monitoring device for implementing the battery shell damage monitoring method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more battery shell damage monitoring device embodiments provided below can refer to the limitations of the battery shell damage monitoring method above, and will not be repeated here.

[0432] In one embodiment, Fig. 27 As shown, a battery shell damage monitoring device 2700 is provided, including: an information acquisition module 2701 and a result determination module 2702, wherein:

[0433] The information acquisition module 2701 is used to acquire the current shell force information of the target battery; the current shell force information is collected by a sensor arranged on the shell of the target battery;

[0434] The result determination module 2702 is used to determine the shell damage monitoring result of the target battery according to the current shell force information.

[0435] In one embodiment, the sensor includes a first pressure sensor, and the first pressure sensor is disposed on the inner wall of the housing of the target battery; Fig.28 As shown, the information acquisition module 2701 includes:

[0436] The first acquisition unit 2801 is used to acquire current shell stress information of the target battery through a first pressure sensor.

[0437] In one embodiment, the first pressure sensor comprises a plurality of first pressure sensors, each of which is disposed at a different position of the welding heat affected zone inside the shell of the target battery.

[0438] In one embodiment, the sensor includes a second pressure sensor, and the second pressure sensor is attached to the outer surface of the shell of the target battery; Fig.29 As shown, the information acquisition module 2701 also includes:

[0439] The second acquisition unit 2901 is used to acquire current shell pressure information of the target battery through a second pressure sensor.

[0440] In one embodiment, the second pressure sensor is attached to the outer surface of the side surface of the shell of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the side surface of the shell.

[0441] In one embodiment, Fig.30 As shown, the result determination module 2702 includes:

[0442] The first determining unit 3001 is used to determine the shell force rising rate of the target battery according to the current shell force information and the preset reference force information;

[0443] The second determining unit 3002 is used to determine the shell damage monitoring result of the target battery according to the shell force increase rate.

[0444] In one embodiment, the current shell force information includes the current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery; Fig.31 As shown, the first determining unit 3001 includes:

[0445] The first determination subunit 3101 is used to determine the shell stress rise rate at any position in the welding heat affected zone according to the current shell stress information at the position and preset reference stress information.

[0446] In one embodiment, the current shell stress information at a location includes multiple stress values, such as Fig.32 As shown, the first determining subunit 3101 includes:

[0447] A first acquisition subunit 3201 is used to acquire a maximum stress value among multiple stress values;

[0448] The second determining subunit 3202 is used to determine the shell stress rise rate at a position according to the maximum stress value and a preset reference stress value.

[0449] In one embodiment, the current shell stress information at the location includes a shell stress signal, such as Fig.33 As shown, the first determining subunit 3101 includes:

[0450] The signal conversion subunit 3301 is used to convert the shell stress signal to obtain the shell frequency domain stress signal;

[0451] The third determination subunit 3302 is used to determine the current shell stress root mean square value at the position according to the shell frequency domain stress signal;

[0452] The fourth determining subunit 3303 is used to determine the shell stress rise rate at the location according to the current shell stress root mean square value at the location and a preset reference root mean square value.

[0453] In one embodiment, Fig.34 As shown, the second determining unit 3002 includes:

[0454] The second acquisition subunit 3401 is used to obtain the shell stress rise rate at different positions in the welding heat affected zone inside the shell of the target battery;

[0455] The fifth determining subunit 3402 is used to determine the shell damage monitoring result of the target battery according to the force increase rate of each shell.

[0456] In one embodiment, Fig.35 As shown, the fifth determining subunit 3402 includes:

[0457] The first judgment subunit 3501 is used to determine that the shell damage monitoring result of the target battery is that the shell is damaged when there is a rise rate of force on each shell greater than a preset rise rate threshold;

[0458] The second judgment subunit 3502 is used to determine that the shell damage monitoring result of the target battery is that the shell has no damage when the force increase rate of each shell is less than or equal to the increase rate threshold.

[0459] In one embodiment, the current shell force information includes current shell pressure information at multiple local positions on the outer surface of the shell of the target battery; Fig.36 As shown, the first determining unit 3001 includes:

[0460] The sixth determining subunit 3601 is used to determine the shell force rise rate of the target battery according to the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and the preset reference pressure information.

[0461] In one embodiment, the current shell pressure information includes the current shell pressure; Fig.37 As shown, the sixth determining subunit 3601 includes:

[0462] The seventh determination subunit 3701 is used to determine the shell pressure rising rate at any local position of the outer surface of the shell according to the current shell pressure at the local position and a preset reference pressure.

[0463] In one embodiment, Fig.38 As shown, the second determining unit 3002 includes:

[0464] The third acquisition subunit 3801 is used to acquire the shell pressure rise rate at multiple local positions on the outer surface of the shell of the target battery;

[0465] The eighth determination subunit 3802 is used to determine the shell damage monitoring result of the target battery according to the pressure increase rate of each shell.

[0466] In one embodiment, Fig.39 As shown, the eighth determining subunit 3802 includes:

[0467] The third judgment subunit 3901 is used to determine that the shell damage monitoring result of the target battery is that the shell is damaged when there is a shell pressure increase rate greater than a preset increase rate threshold value among the shell pressure increase rates;

[0468] The fourth judgment subunit 3902 is used to determine that the shell damage monitoring result of the target battery is that the shell has no damage when the shell pressure increase rate is less than or equal to the increase rate threshold.

[0469] In one embodiment, Fig.40 As shown, the seventh determining subunit 3701 includes:

[0470] A ninth determining subunit 4001, configured to determine a total pressure of an outer surface of a shell of a target battery according to current shell pressure information at a plurality of local positions on an outer surface of a shell of a target battery;

[0471] The tenth determining subunit 4002 is used to determine the total pressure increase rate of the shell of the target battery according to the total pressure on the outer surface of the shell and a preset reference total pressure.

[0472] In one embodiment, Fig.41 As shown, the second determining unit 3002 includes:

[0473] The fifth judgment subunit 4101 is used to determine that the shell damage monitoring result of the target battery is that the shell is damaged when the total shell pressure increase rate is greater than a preset increase rate threshold;

[0474] The sixth judgment subunit 4102 is used to determine that the shell damage monitoring result of the target battery is that the shell has no damage when the shell total pressure increase rate is less than or equal to the increase rate threshold.

[0475] In one embodiment, Fig.42 As shown, the device 2700 also includes:

[0476] The duration determination module 4201 is used to determine the duration of abnormality of the target battery according to the time when the shell of the target battery is damaged and the initial working time of the target battery when the shell damage monitoring result of the target battery is that the shell is damaged;

[0477] The life determination module 4202 is used to determine the predicted life of the target battery according to the duration of the abnormality of the target battery, the standard test duration and the standard test life.

[0478] In one embodiment, Fig.43 As shown, the device 2700 also includes:

[0479] The experimental module 4301 is used to obtain the force information of multiple batteries in the battery module when the battery module is subjected to a vibration experiment;

[0480] The monitoring module 4302 is used to monitor the shell damage of the battery whose force information is greater than a preset force threshold.

[0481] Each module in the above-mentioned battery shell damage monitoring device can be implemented in whole or in part by software, hardware and their combination. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0482] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Fig.44 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store battery shell damage monitoring data. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery shell damage monitoring method is implemented.

[0483] Those skilled in the art will understand that Fig.44 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0484] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0485] The implementation principles and technical effects of each step implemented by the processor in this embodiment are similar to the principles of the above-mentioned battery shell damage monitoring method, and will not be repeated here.

[0486] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0487] The implementation principles and technical effects of the steps implemented when the computer program in this embodiment is executed by the processor are similar to the principles of the above-mentioned battery casing damage monitoring method, and will not be repeated here.

[0488] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0489] The implementation principles and technical effects of the steps implemented when the computer program in this embodiment is executed by the processor are similar to the principles of the above-mentioned battery casing damage monitoring method, and will not be repeated here.

[0490] It should be noted that the data involved in this application (including but not limited to data used for analysis, stored data, displayed data, etc.) are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0491] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0492] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0493] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery casing damage monitoring method, characterized in that: The method comprises: Acquiring current shell force information of the target battery; the current shell force information is collected by a sensor disposed on the shell of the target battery; The shell damage monitoring result of the target battery is determined according to the current shell force information.

2. The method according to claim 1, characterized in that The sensor includes a first pressure sensor, and the first pressure sensor is arranged on the inner wall of the shell of the target battery; the obtaining current shell force information of the target battery includes: The current shell stress information of the target battery is collected through the first pressure sensor.

3. The method according to claim 2, characterized in that The first pressure sensors include a plurality of first pressure sensors, each of which is disposed at a different position of a welding heat-affected zone inside the shell of the target battery.

4. The method according to any one of claims 1 to 3, characterized in that: The sensor includes a second pressure sensor, and the second pressure sensor is attached to the outer surface of the shell of the target battery; and the obtaining of current shell force information of the target battery includes: The current shell pressure information of the target battery is collected by the second pressure sensor.

5. The method according to claim 4, characterized in that The second pressure sensor is attached to the outer surface of the side surface of the shell of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the side surface of the shell.

6. The method according to any one of claims 1 to 5, characterized in that: The determining, according to the current shell force information, the shell damage monitoring result of the target battery includes: Determining a shell force rising rate of the target battery according to the current shell force information and preset reference force information; The shell damage monitoring result of the target battery is determined according to the shell force rising rate.

7. The method according to claim 6, characterized in that The current shell force information includes current shell stress information at different positions in the welding heat affected zone inside the shell of the target battery; the shell force rise rate of the target battery is determined according to the current shell force information and the preset reference force information, including: For the current shell stress information at any position in the welding heat affected zone, the shell stress rise rate at the position is determined according to the current shell stress information at the position and preset reference stress information.

8. The method according to claim 7, characterized in that The current shell stress information at the position includes a plurality of stress values, and determining the shell stress rise rate at the position according to the current shell stress information at the position and preset reference stress information includes: Obtaining a maximum stress value among the multiple stress values; The shell stress rise rate at the position is determined according to the maximum stress value and a preset reference stress value.

9. The method according to claim 7, characterized in that: The current shell stress information at the position includes a shell stress signal, and determining the shell stress rise rate at the position according to the current shell stress information at the position and preset reference stress information includes: Transforming the shell stress signal to obtain a shell frequency domain stress signal; Determining a current shell stress root mean square value at the position according to the shell frequency domain stress signal; The shell stress rise rate at the position is determined according to the current shell stress root mean square value at the position and a preset reference root mean square value.

10. The method according to any one of claims 7 to 9, characterized in that: The determining the shell damage monitoring result of the target battery according to the shell force rising rate includes: Obtaining the shell force rise rate at different positions in the welding heat affected zone inside the shell of the target battery; The shell damage monitoring result of the target battery is determined according to the shell force increase rate.

11. The method according to claim 10, characterized in that The determining the shell damage monitoring result of the target battery according to the shell force rising rate includes: When one of the shell force increase rates is greater than a preset increase rate threshold, determining that the shell damage monitoring result of the target battery is that the shell is damaged; When the rising rates of the shell forces are all less than or equal to the rising rate threshold, it is determined that the shell damage monitoring result of the target battery is that there is no shell damage.

12. The method according to claim 6, characterized in that The current shell force information includes current shell pressure information at multiple local positions on the outer surface of the shell of the target battery; and determining the shell force rise rate of the target battery according to the current shell force information and preset reference force information, including: The force rise rate of the shell of the target battery is determined according to current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and preset reference pressure information.

13. The method according to claim 12, characterized in that The current shell pressure information includes the current shell pressure; the determining the shell force rise rate of the target battery according to the current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and the preset reference pressure information includes: For a current shell pressure at any local position on the outer surface of the shell, a shell pressure rising rate at the local position is determined according to the current shell pressure at the local position and a preset reference pressure.

14. The method according to claim 13, characterized in that The determining the shell damage monitoring result of the target battery according to the shell force rising rate includes: Obtaining a shell pressure rise rate at a plurality of local positions on the outer surface of the shell of the target battery; The shell damage monitoring result of the target battery is determined according to each shell pressure rising rate.

15. The method according to claim 14, characterized in that The determining the shell damage monitoring result of the target battery according to each shell pressure rising rate includes: When one of the shell pressure rising rates is greater than a preset rising rate threshold, determining that the shell damage monitoring result of the target battery is that the shell is damaged; When the shell pressure rising rates are all less than or equal to the rising rate threshold, it is determined that the shell damage monitoring result of the target battery is that there is no shell damage.

16. The method according to any one of claims 12 to 15, characterized in that: The step of determining the shell force rise rate of the target battery according to current shell pressure information at multiple local positions on the outer surface of the shell of the target battery and preset reference pressure information includes: Determining the total pressure of the outer surface of the shell of the target battery according to current shell pressure information at multiple local positions on the outer surface of the shell of the target battery; The total pressure rise rate of the shell of the target battery is determined according to the total pressure on the outer surface of the shell and a preset reference total pressure.

17. The method according to claim 16, characterized in that The determining the shell damage monitoring result of the target battery according to the shell force rising rate includes: When the total shell pressure rise rate is greater than a preset rise rate threshold, determining that the shell damage monitoring result of the target battery is that the shell is damaged; When the shell total pressure rising rate is less than or equal to the rising rate threshold, it is determined that the shell damage monitoring result of the target battery is that the shell has no damage.

18. The method according to any one of claims 1 to 17, characterized in that: The method further comprises: When the shell damage monitoring result of the target battery is that the shell is damaged, determining the duration of the abnormality of the target battery according to the time when the shell of the target battery is damaged and the initial working time of the target battery; The predicted life of the target battery is determined according to the duration of the abnormality of the target battery, the standard test duration and the standard test life.

19. The method according to any one of claims 1 to 18, characterized in that: The method further comprises: Obtaining force information of multiple batteries in the battery module when the battery module is subjected to a vibration test; The shell damage monitoring is performed on the battery whose stress information is greater than the preset stress threshold.

20. A battery casing damage monitoring system, characterized in that: The system comprises: a sensor and a host computer; the sensor is arranged on a housing of a target battery, and the sensor is connected to the host computer; The host computer is used to determine the shell damage monitoring result of the target battery according to the current shell force information of the target battery collected by the sensor.

21. The system according to claim 20, characterized in that The system further comprises a force acquisition unit, which is connected between the sensor and the host computer; The force acquisition unit is used to obtain the current shell force information of the target battery collected by the sensor, process the current shell force information, and send the processed current shell force information to the host computer.

22. The system according to claim 21, characterized in that The sensor includes a plurality of first pressure sensors, each of which is respectively arranged at a different position of a welding heat-affected zone inside a shell of the target battery, and an axial direction of each of the first pressure sensors is parallel to a height direction of the shell; each of the first pressure sensors is connected to the force acquisition unit via a first acquisition line; Each of the first pressure sensors is used to collect shell stress information at different positions of the welding heat affected zone inside the shell.

23. The system according to claim 22, characterized in that The different positions include a positive electrode column, a negative electrode column of the target battery corresponding to the shell of the target battery in the width direction and a middle position in the width direction.

24. The system according to claim 22 or 23, characterized in that Each of the first pressure sensors includes an upper sealing film, a sensitive grid and a substrate pasted in sequence; the sensitive grid is connected to the first sensing lead through a contact; each of the first pressure sensors is pasted inside the shell of the target battery through the substrate, and is connected to the first acquisition line through the first sensing lead.

25. The system according to claim 24, characterized in that The first sensing leads of each of the first pressure sensors are gathered together and led out from the top cover opening of the target battery; the lower surface of the top cover opening is sealed by a first sealant, and the upper surface of the top cover opening is sealed by a second sealant; the structural strength of the second sealant is greater than a preset strength threshold.

26. The system according to any one of claims 22 to 25, characterized in that: The upper edge of each first pressure sensor is flush with the lower edge of the top cover of the target battery.

27. The system according to any one of claims 22 to 26, characterized in that: The sensor includes a second pressure sensor, which is attached to the outer surface of the shell of the target battery; the second pressure sensor is connected to the force acquisition unit through a second acquisition line; The second pressure sensor is used to collect shell pressure information outside the shell.

28. The system according to claim 27, characterized in that The second pressure sensor is attached to the outer surface of the side surface of the shell of the target battery, and the area of ​​the force sensing region of the second pressure sensor is greater than or equal to the area of ​​the side surface of the shell.

29. The system according to claim 27 or 28, characterized in that The second pressure sensor includes a first packaging flexible film, a first electrode, a second electrode, and a second packaging flexible film which are sequentially pasted; the first electrode and the second electrode are both connected to the conductive contact through a second sensing lead; the first electrode and the second electrode are both coated with a pressure-sensitive coating, and the first electrode and the second electrode are arranged crosswise; the second pressure sensor is pasted on the outer surface of the shell of the target battery through the second packaging flexible film, and is connected to the second acquisition line through the conductive contact.

30. A battery casing damage monitoring device, characterized in that: The device comprises: An information acquisition module, used to acquire current shell force information of a target battery; the current shell force information is collected by a sensor disposed on the shell of the target battery; The result determination module is used to determine the shell damage monitoring result of the target battery according to the current shell force information.

31. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 19 are implemented.

32. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 19 are implemented.

33. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 19 are implemented.

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