Battery pack shell repairing system

Abstract

The invention provides a battery pack shell repairing system (1), comprising: a battery pack shell (2) comprising an outer shell (21) and a self-repairing material layer (22); a detection device (3) that detects damage to the battery pack case (2); and the control device is used for controlling the heating device (5) to heat the battery pack shell (2) according to the detected damage of the battery pack shell (2) so as to excite the self-repairing material layer (22) to release the self-repairing material, so that the damage of the battery pack shell (2) is repaired. According to the invention, even if the outer shell (21) of the battery pack shell (2) is damaged and the self-repairing material layer (22) is not damaged or the self-repairing material released by the self-repairing material layer (22) is insufficient to repair the damage, the self-repairing material layer (22) can repair the damage. And the detection device (3) can be used for judging the existence of the damage and exciting the self-repairing material layer (22) to release the self-repairing material for repairing.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery pack shell repair system. Background Art

[0002] The vehicle's power battery has high requirements for sealing. Once the battery leaks, it is easy to cause a series of problems such as insulation leakage. As a traditional response strategy, when the battery pack shell is bumped, the vehicle is often stopped immediately and the owner is prompted to repair the battery. However, such a response strategy cannot cope with emergency situations. Summary of the invention

[0003] Technical problem to be solved by the invention

[0004] The existing battery pack shell is often not well repaired in time when it is damaged. The purpose of the present invention is to provide a battery pack shell repair system that can repair the damage of the battery pack shell in time and fully.

[0005] Technical means for solving technical problems

[0006] The present invention provides a battery pack shell repair system, comprising: a battery pack shell, the battery pack shell comprising an outer shell and a self-healing material layer; a detection device, the detection device detecting damage to the battery pack shell; a control device, the control device controlling a heating device to heat the battery pack shell according to the detected damage to the battery pack shell to stimulate the self-healing material layer to release the self-healing material, thereby repairing the damage to the battery pack shell.

[0007] Effects of the Invention

[0008] According to the present invention, even if the outer shell of the battery pack shell is damaged but the self-healing material layer is not damaged or the self-healing material released by the self-healing material layer is insufficient to repair the damage, the presence of damage can be determined based on the detection device and the self-healing material layer can be stimulated to release self-healing material for repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of a battery pack shell repair system according to an embodiment of the present invention.

[0010] Figure 2 It is a schematic diagram of a portion of a battery pack casing repair system including a heating device according to an embodiment of the present invention.

[0011] Figure 3 is a cross-sectional view of a battery pack shell according to an embodiment of the present invention.

[0012] Figure 4 It is a front view of the battery pack shell of an embodiment of the present invention.

[0013] Figure 5 is a cross-sectional view of a battery pack shell of another structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0015] It should be pointed out that the embodiments of the present invention and the technical features therein may be combined with each other without conflict.

[0016] An embodiment of the present invention provides a battery pack shell repair system 1, which can promptly repair the battery pack shell 2 when it is bumped, thereby playing an emergency role.

[0017] like Figures 1 to 3 As shown, the battery pack shell repair system 1 includes: a battery pack shell 2, which is a two-layer structure including an outer shell 21 and a self-healing material layer 22; a detection device 3, which detects damage to the battery pack shell 2; and a control device, which controls the heating device 5 to heat the battery pack shell 2 according to the detected damage to the battery pack shell 2 to stimulate the self-healing material layer 22 to release the self-healing material, thereby repairing the damage to the battery pack shell 2.

[0018] In the event of certain specific collisions of the battery pack shell 2, the following three collision situations may occur due to factors such as the collision location (corner or face of the battery pack shell 2), the collision type (collision with a blunt object or a sharp object), the collision force, and the different hardness of the outer shell 21 and the self-healing material layer 22.

[0019] In case 1, due to the small collision force or other reasons, no damage (cracks, holes, etc.) is formed in the battery pack housing 2. At this time, the collision will not affect the function of the battery pack housing 2, and no remedial repair treatment is required for the battery pack housing 2.

[0020] In the second case, due to the strong collision force, the outer shell 21 and the self-repairing material layer 22 of the battery pack shell 2 are damaged. At this time, the self-repairing material layer 22 can self-repair itself and the collision damage of the outer shell 21 according to its own performance described later. Through the self-repair of the self-repairing material layer 22, the battery pack shell 2 can be treated in an emergency, so as to wait for the owner to formally repair or replace the battery when the time is right.

[0021] In case 3, the outer shell 21 of the battery pack shell 2 is damaged, but the collision does not damage the self-repairing material layer 22, or only causes minor damage to the self-repairing material layer 22. In this case, the self-repairing material layer 22 will not self-repair, or the degree of self-repair (the amount of self-repairing material released) is not enough to repair the damage of the outer shell 21.

[0022] In the fourth case, the damage to the battery pack shell 2 is relatively large. Although the self-repairing material in the prior art may be able to perform a certain amount of repair, the self-repairing material is not released enough, so the damage cannot be reliably repaired.

[0023] In situations three and four, the battery pack housing 2 will continue to work with unrepaired damage, posing a risk of threatening electricity safety.

[0024] According to the battery pack shell repair system 1 of this embodiment, by providing the detection device 3, the damage of the battery pack shell 2 can be continuously detected, so that even if the collision of the above-mentioned situation 3 or situation 4 occurs, the damage of the battery pack shell 2 can be detected by the detection device 3, and the self-repairing material layer 22 can be actively stimulated to release a sufficient amount of self-repairing material to repair the damage of the battery pack shell 2. In this way, the damage of the battery pack shell 2 can be reliably repaired.

[0025] In fact, if Figure 1 Shown and Figure 4 As shown, the battery pack housing 2 includes an upper housing 24 and a lower housing 25, which are assembled to form the battery pack housing 2 and accommodate the battery module 6 therein. Figure 3 The schematic diagram only shows the two-layer structure of the battery pack housing 2 including the outer shell 21 and the self-healing material layer 22, and the upper shell 24 and the lower shell 25 are not shown. Figure 5 ), when there is no need to distinguish between the upper shell 24 and the lower shell 25, they are collectively represented as shell 2.

[0026] in addition, Figures 3 to 5 The shape of the battery pack housing 2 is only shown as a rectangular parallelepiped, but as shown in FIG. Figure 1 As shown, the shape of the battery pack case 2 only needs to be a hollow box shape so as to be able to accommodate the battery module 6 .

[0027] In addition, it should be noted that Figure 4 is a front view of the battery pack housing 2, Figure 3 and Figure 5 for Figure 4 The AA line view shows the cross section of the battery pack housing 2.

[0028] The following describes in detail the composition and functions of each part of the battery pack shell repair system 1.

[0029] [Example]

[0030] <Battery Pack Case 2>

[0031] like Figure 1 As shown, the battery pack housing 2 is the housing of the battery for the vehicle, for example, the housing of the power battery of the new energy vehicle. The shape of the battery pack housing 2 is set according to the design shape of the battery. In this embodiment, the battery pack housing 2 is a rectangular parallelepiped with six roughly flat surfaces. That is, the battery pack housing 2 is formed into a hollow box shape, and a plurality of battery modules 6 of vehicle batteries are accommodated in the battery pack housing 2, and the battery modules 6 are used to supply energy to the vehicle.

[0032] like Figure 3 As shown, the battery pack shell 2 includes an outer shell 21 and a self-healing material layer 22. In this embodiment, the outer shell 21 constitutes the outer layer of the battery pack shell 2, is in a rectangular shape, and is a hollow box as a whole. The outer shell 21 is made of a lightweight, high-strength material, such as a metal material. However, the outer shell 21 can also be made of a polymer material, etc.

[0033] The self-repairing material layer 22 is attached to the inner surface of the outer shell 21 and forms the inner layer of the battery pack shell 2. The self-repairing material layer 22 contains a self-repairing material.

[0034] Since the battery pack housing 2 is more likely to be hit by an external collision, in this embodiment, only the outer housing 21 disposed on the outside and the self-repairing material layer 22 disposed on the inside are included, that is, the battery pack housing 2 is formed into a two-layer structure. However, in the case where the battery pack housing 2 may be hit by an internal collision, an inner housing 23 may be disposed inside the self-repairing material layer 22, that is, the self-repairing material layer 22 is attached to the outer housing 21.

[0035] In addition, you can also Figure 5As shown, the battery pack housing 2 also includes an inner housing 23 outside the outer housing 21, and the self-healing material layer 22 is sandwiched between the outer housing 21 and the inner housing 23, that is, the battery pack housing 2 is formed into a three-layer structure formed by the outer housing 21, the self-healing material layer 22 and the inner housing 23. As a result, the outer housing 21 and the inner housing 23 can be used to protect the self-healing material layer 22, so as to avoid the self-healing material in the self-healing material layer 22 from being unnecessarily stimulated and wasted. For example, in some low-intensity collisions, if the outer housing 21 or the inner housing 23 is collided, no collision damage will occur, that is, the properties of the battery pack housing 2 will not be affected. However, with the same collision intensity, if the self-healing material layer 22 is collided, the self-healing material layer 22 may be damaged, resulting in the waste of the self-healing material in the self-healing material layer 22 when it is not actually necessary to repair it. Therefore, by setting the battery pack housing 2 to a structure in which the self-healing material layer 22 is sandwiched by the outer housing 21 and the inner housing 23, the above-mentioned unnecessary waste of self-healing materials can be avoided.

[0036] In addition, when a structure is adopted in which the self-healing material layer 22 is sandwiched between the outer shell 21 and the inner shell 23, it is also possible to prevent the self-healing material released by the self-healing material layer 22 from flowing to the inside or outside of the battery pack shell 2 and being wasted, and it can better ensure that the self-healing material released by the self-healing material layer 22 can flow to the damaged position of the shell.

[0037] In addition, as an example, the self-healing material used in the self-healing material layer 22 includes a capsule, and the capsule includes a capsule membrane and the self-healing material contained in the capsule membrane. The capsule membrane can undergo physical or chemical changes at a specific temperature, thereby releasing the self-healing material therein.

[0038] As a material, the capsule membrane can be made of common thermosensitive materials, such as wax materials, polymers, thermoplastic elastomers, or metals or alloys with a specific melting point. The size of the capsule can be determined according to the application requirements and manufacturing process. The diameter of the capsule is usually between a few microns and hundreds of microns. For example, in a self-healing material, 6 to 12 microcapsules may be contained per cubic centimeter. The size of these capsules needs to be small enough to ensure uniform distribution in the matrix material, but not too small to avoid rupture during manufacturing or use. In addition, as a self-healing material contained in the capsule membrane, for example, liquids or low-viscosity substances such as dicyclopentadiene (DCPD) can be used. These substances are released after the capsule is broken, flow along the cracks and fill the cracks. The capsule can also contain a catalyst, or the catalyst is pre-mixed in the matrix material that contains the capsule. When the capsule membrane is destroyed, under the action of the catalyst, the activation energy of the required chemical reaction is lower, and the repair (polymerization) speed is faster. However, the catalyst is not always necessary and should be selected according to the specific composition of the repair agent.

[0039] As a specific implementation of the self-healing material layer, for example, a large number of capsules are contained in the matrix material of the self-healing material layer 22. Different capsules contain one of a polymerizable material and a polymerizing agent. When the capsule film melts, the polymerizable material and the polymerizing agent are released and contacted, so that the polymerizable material is polymerized to repair the damage of the battery pack shell 2.

[0040] [Detection device 3]

[0041] like Figure 1 As shown, in this embodiment, the detection device 3 includes a resistance detector 31, which is disposed on the battery pack housing 2 to detect the insulation resistance of the battery pack housing 2. When a sudden change in the insulation resistance of the battery pack housing 2 is detected, it can be determined that the battery pack housing 2 is damaged. Specifically, the resistance detector 31 is at least disposed on the inner side ( Figure 1 Only a resistance sensor disposed on the inner surface of the bottom of the battery pack housing 2 is schematically shown. By disposing the resistance detector 31 on the inner side of the battery pack housing 2, the leakage current can be accurately captured, thereby detecting the insulation resistance of the battery pack housing 2. The data measured by the resistance detector 31 can be filtered to eliminate noise.

[0042] Resistance detectors 31 are provided in all key insulating areas inside the battery pack shell 2 (including the outside of the battery pack shell 2), including but not limited to different surfaces of the battery pack shell 2, partitions between battery modules, and insulating layers between the battery module 6 and the battery pack shell 2. By combining multiple resistance detectors 31, comprehensive monitoring of the insulation state of the entire battery pack shell 2 can be achieved. In addition, since the insulation resistance value is different when the location and form (size and shape) of the damage are different, the specific location and form of the damage can be determined by analyzing the detection results of multiple resistance detectors 31.

[0043] When the detection device 3 includes a resistance detector 31 arranged inside the battery pack shell 2, the battery ECU can be conveniently used as the control device described below without setting up a separate control device, thereby reducing the number of components and saving costs.

[0044] The control device controls the heating device 5 to heat the battery pack shell 2 according to the damage of the battery pack shell 2 detected by the resistance detector 31 .

[0045] Specifically, as described above, the detection device 3 includes a plurality of resistance detectors 31, which are arranged at different positions of the battery pack shell 2. Under normal circumstances (when the battery pack shell 2 is not hit), the detection results of these resistance detectors 31 should be stable. However, when the battery pack shell 2 is hit and damaged, the insulation resistance detected by the resistance detector 31 will change. At this time (for example, when the change in insulation resistance exceeds a preset threshold), the control device determines that the battery pack shell 2 is damaged, and thus controls the heating device 5 to heat the battery pack shell 2 to stimulate the self-healing material layer 22 to release the self-healing material.

[0046] In this embodiment, since resistance detectors 31 are respectively provided at multiple positions, the control device can deduce the position where the damage occurs and the form of the damage through the resistance values ​​detected by the multiple resistance detectors 31. At this time, the control device can control the heating device 5 to heat the position corresponding to the damage, so as to accurately repair the damage.

[0047] Specifically, in this embodiment, the control device stores a damage assessment model, which can output information related to the damage position and damage form by taking the insulation resistance detected by the resistance detector 31 at each position, the change in insulation resistance, and the rate of change of insulation resistance as input.

[0048] The damage assessment model can be trained in advance using information of the battery pack shell 2 whose damage position and damage form are known as training data. Specifically, the insulation resistance of the battery pack shell 2 whose damage position and damage form are known, the change amount of the insulation resistance when damage occurs, and the change rate of the insulation resistance can be used as inputs, and the damage position and damage form can be used as outputs to train the damage assessment model, thereby obtaining a trained damage assessment model.

[0049] Therefore, the specific position and form of damage in the battery pack case 2 can be accurately analyzed by the damage assessment model.

[0050] In addition, the above description describes a method of analyzing the position and shape of damage using a model. However, as another embodiment, the position and shape of damage may be determined using a table, for example.

[0051] For example, relevant data can be obtained by conducting tests in advance, and the insulation resistance of the battery pack shell 2, the change in insulation resistance when damage occurs, and the rate of change of insulation resistance in the obtained data are recorded in a table corresponding to the damage position and damage form. Therefore, after a collision, it is only necessary to determine the insulation resistance of the battery pack shell 2, the change in insulation resistance when damage occurs, and the rate of change of insulation resistance, and then the corresponding damage position and damage form can be found in the table.

[0052] In addition, the detection device 3 may also have only one resistance detector 31, so that the detection device 3 can only detect whether there is damage (cracks, etc.) without detecting the specific location and form of the damage. In the case of damage, the control device controls the heating device 5 to heat the entire self-healing material layer 22 to release the self-healing material.

[0053] <Control device>

[0054] The control device can be implemented by a battery ECU inside the battery pack housing 2, so as to facilitate the connection between the control device and the detection device 3 (resistance sensor 31, etc.) and the heating device 5. Of course, the control device can also be implemented by a separately set controller chip or vehicle ECU, etc. Part of the functions of the control device can also be implemented by the detection device 3, which does not affect the realization of the effect of the scheme of this embodiment.

[0055] It should be noted that, when the control device determines that the damage has been repaired based on the detection result of the detection device 3, the control device stops the heating device 5 from heating.

[0056] <Heating device 5>

[0057] In this embodiment, the heating device 5 includes a resistor 51 for heating the battery pack housing 2. In this embodiment, a plurality of resistors 51 are provided, which are respectively connected to the battery ECU as a control device and to the positive and negative electrodes of the battery module 6 in the battery pack housing 2, and are provided at different positions of the self-healing material layer 22 to heat the different positions. The circuit to which the resistor 51 is connected is disconnected or connected under the control of the control device to control the heating of the resistor 51.

[0058] Figure 2 The figure shows the case where four resistors 51 are provided, and the four resistors 51 are respectively located at different positions of the inner surface of the battery pack housing 2 (self-repairing material layer 22), for example, located at the bottom inner surface of the self-repairing material layer 22, so that different positions of the battery pack housing 2 (self-repairing material layer 22) can be heated. By providing multiple resistors 51, it is possible to accurately control the heating position, and thus more accurately control the position where the self-repairing material is repaired.

[0059] Consider a situation where the battery pack housing 2 is damaged by a collision. If the self-repairing material layer 22 at all positions is heated at once, the self-repairing material layer 22 at all positions will release the self-repairing material. At this time, if the battery pack housing 22 is damaged by a collision again, since the self-repairing material layer 22 has been activated, even if it is heated again, the self-repairing material cannot be released and the damage cannot be repaired.

[0060] According to this embodiment, since the damaged position and damage form can be accurately detected and the accurate position can be heated at the same time, the self-repairing material in the self-repairing material layer 22 at the damaged position (and its vicinity) can be released. At this time, if the battery pack housing 2 collides again, the heating device 5 can still be controlled by the control device to repair the damage that occurs again, thereby further ensuring safety.

[0061] The resistor 51 can be attached to the self-healing material layer 22 or built into the self-healing material layer 22, that is, the self-healing material layer 22 can be arranged in a manner of covering the resistor 51, so that the heat of the resistor 51 can be more efficiently used to heat the self-healing material layer 22.

[0062] It should be noted that no matter whether the resistor 51 is attached to the inner surface of the self-healing material layer 22 or is built into the self-healing material layer 22, since the resistor 51 is arranged on the inner side of the battery pack shell 2, the resistor 51 does not need to pass through the battery pack shell 2 (outer shell 21) to be connected to the battery module inside the battery pack shell 2 to supply power. Therefore, the connection structure of the resistor 51 is simple, which can save wiring and the heating device 5 can be set without perforating the battery pack shell 51.

[0063] In addition, the above describes a scheme in which a plurality of resistors 51 are provided, that is, resistors 51 are provided at different positions of the self-healing material layer 22, so as to control heating of each position of the self-healing material layer 22 individually. However, the heating device 5 may also include only one resistor 51 formed in a mesh shape, having the same surface shape as the self-healing material layer 22 and attached to the inner surface of the self-healing material layer 22. In this case, when the control device controls the resistor 51 to heat the self-healing material layer, all areas of the self-healing material layer 22 can be heated at the same time.

[0064] In this case, since there is no need to detect the specific location of the damage, only one resistance detector 31 may be provided.

[0065] According to the battery pack shell repair system 1 described above, even if the outer shell 21 of the battery pack shell 2 is damaged and the self-repairing material layer 22 is not damaged or the self-repairing material released by the self-repairing material layer 22 is insufficient to repair the damage, it is possible to judge the presence of damage based on the change in the insulation resistance of the battery pack shell 2 and stimulate the self-repairing material layer 22 to release self-repairing material for repair.

[0066] <Modification 1>

[0067] In the embodiment, an independent resistor 51 is provided to heat the battery pack housing 2 (self-healing material layer 22 ), but the balancing resistor 511 already provided inside the battery pack may also be used as the resistor 51 for heating.

[0068] Specifically, the resistance module 6 inside the battery pack housing 2 is composed of a plurality of battery cells 61. Due to differences in usage and internal resistance, these battery cells 61 may generate voltage differences. Such voltage differences between the battery cells 61 may affect the normal use of the battery module 6, so a battery balancing system is required to be specially provided to smooth out the voltage differences between the battery modules 6.

[0069] like Figure 2 As shown, a plurality of battery cells 61 form a battery balancing system through a circuit. The battery balancing system includes a balancing resistor 511 connected to each battery cell 61. When a voltage difference occurs between the battery cells 61, the balancing resistor 511 is used to discharge the resistor cell 61 with a higher voltage.

[0070] exist Figure 2 In the figure, only one balancing resistor 511 is shown for one voltage module 6, however, multiple balancing resistors 511 may be provided according to the circuit adopted by the battery balancing system. In this variant, four battery modules 6 are accommodated in the battery pack housing 2, and the battery balancing system of each battery module 6 is provided with an balancing resistor 511, so that the bottom of the battery pack housing 2 can be divided into four areas for separate heating. However, the battery pack housing 2 may accommodate more than four (more or less) battery modules 6, and the battery balancing system of each battery module 6 may include multiple balancing resistors 511, so that the battery pack housing 2 may be divided into more areas for heating. Moreover, these balancing resistors 511 may also be provided at positions for heating areas other than the bottom of the battery pack housing 211, such as the side walls and the top wall.

[0071] Since the battery balancing system needs to use the balancing resistor 511 to discharge the battery module 6, the balancing resistor 511 itself will generate heat. Since the balancing resistor 511 is arranged inside the battery pack shell 2, the heat of the balancing resistor 511 can be conveniently used to heat the battery pack shell 2 to repair the damage. Through this solution, the heat generated by the battery balancing system is effectively utilized without the need to set up a heating device 5 separately, saving components and avoiding the generation of excess heat inside the battery.

[0072] <Modification 2>

[0073] The difference between the modification 2 and the above-mentioned embodiment is that the structure of the heating device 5 is different.

[0074] In variant 1, the heating device 5 includes a heating tube body. The heating tube body is a hollow tube connected to a vehicle cooling water pipe (such as an engine cooling water pipe, etc.), and the heating device 5 controls the flow of cooling water in the heating tube body by controlling the opening of a valve of the heating tube body, thereby controlling the heating of the battery pack housing 2.

[0075] In addition, the heating tube body is arranged outside the battery pack shell 2, for example, attached to the outer surface of the battery pack shell 2, so that the heating tube body can be conveniently connected to the vehicle cooling pipe without perforating the battery pack shell 2.

[0076] In addition, as shown, the heating tube body may also have a plurality of branch tube bodies, etc. These branch tube bodies, etc. are respectively located at different positions of the battery pack shell 2 , so as to heat different parts of the battery pack shell 2 .

[0077] In the case where the heating device 5 includes a heating tube body disposed outside the battery pack housing 2, the control device can be the same as in the embodiment, that is, a battery ECU disposed inside the battery pack housing 2, and the two are connected by wires. The control device can also be a vehicle ECU or a separate controller disposed outside the battery pack housing 2, and controls the valve of the heating tube body. Preferably, the control device is a structure disposed outside the battery pack housing 2, so that the control device can conveniently control the valve of the heating tube body outside the battery pack housing 2.

[0078] <Variation 3>

[0079] The difference between the modified example 3 and the embodiment is that the detection device 3 further includes a camera 32 and an air pressure sensor 33 in addition to the resistance detector 31 .

[0080] The camera 32 is disposed at a position capable of photographing the battery pack shell 2, for example, at a position capable of photographing at least the vulnerable areas including the seams and vents of the battery pack shell 2, and the photographed images are sent to the control device. The camera 32 is, for example, disposed at the center of the top of the battery pack and protected by a high-strength and explosion-proof protective cover. By arranging the camera 32 at this position, a wide shooting field of view can be provided, and most of the surface of the battery pack shell 2, especially the seams, vents and other vulnerable areas, can be photographed. Figure 1 In order to conveniently show the position of the camera 32, the perspective relationship of the object is changed to show the camera 32 which should be located inside the battery pack housing 2. Figure 1 In the figure, according to the correct perspective relationship, the camera 32 should be blocked by the side wall of the upper housing 24 and cannot be shown. Here, the arrangement of the camera 32 is only an example.

[0081] In addition, the camera 32 may be disposed not on the battery pack housing 2 but on other structures outside the battery pack housing 2 , so that the battery pack housing 2 can be photographed from the outside.

[0082] The camera 32 can be set to have an adjustable shooting angle, or multiple cameras 32 can be set to shoot various surfaces of the battery pack shell 2. The image captured by the camera 32 can be used to extract the damage features on the surface of the battery pack shell 2 through image processing technology (such as edge detection, morphological analysis, etc.). In addition, the image captured by the camera 32 can be subjected to pre-processing steps such as denoising and enhancement to improve the accuracy of subsequent analysis. These processes can be performed by the control device.

[0083] The air pressure sensor 33 is installed inside the battery pack case 2 to detect the internal air pressure of the battery pack case 2 .

[0084] The control device controls the heating device 5 to heat the battery pack housing 2 based on the insulation resistance detected by the resistance detector 31 , the image taken by the camera 32 , and the internal air pressure detected by the air pressure sensor 33 .

[0085] Specifically, the control device stores a damage assessment model, and uses the damage assessment model to extract image feature information related to the morphology (shape, size) and position of the damaged area based on the above-mentioned image. At the same time, the damage assessment model is used to calculate the change amount and change rate of the insulation resistance detected by the resistance sensor 31, and the insulation resistance, the change amount of the insulation resistance and the change rate of the insulation resistance are used as resistance feature information. Further, the damage assessment model is used to take the air pressure value and the air pressure change rate measured by the air pressure sensor 33 as airtightness feature information. Finally, the control device detects damage to the battery pack shell 2 based on the above-mentioned image feature information, the above-mentioned resistance feature information and the above-mentioned airtightness feature information, and controls the heating device 5 to heat the battery pack shell 2.

[0086] For example, the control device can determine the specific position and form (size, shape) of the damage in the battery pack shell 2 based on the above-mentioned image feature information, the above-mentioned resistance feature information and the above-mentioned airtightness feature information, and control the heating device 5 to heat the position, thereby achieving precise excitation of the specific position of the self-healing material layer 22.

[0087] The damage assessment model involved in the second modification can be obtained by training in the following manner:

[0088] The damage assessment model can be trained in advance using information of the battery pack housing 2 whose damage position and damage form are known as training data. Specifically, the insulation resistance value of the battery pack housing 2 whose damage position and damage form are known, the change amount of the insulation resistance value when damage occurs, the change rate of the insulation resistance value, the image feature information related to the form and position of the damaged area, the air pressure value and the air pressure change rate can be used as inputs, and the damage position and damage form can be used as outputs to train the damage assessment model.

[0089] By using the trained damage assessment model, the specific position and form (size, shape) of the damage in the battery pack casing 2 can be determined as described above.

[0090] The above describes an embodiment in which the location and shape of damage are analyzed using a model. However, as another implementation, for example, the location and shape of damage may be determined using a table as in the embodiment.

[0091] In addition, in variant example 2, the detection device 3 also includes a resistance detector 31, a camera 32 and an air pressure sensor 33, and detects damage (the location and shape of the damage) of the battery pack shell 2 based on the insulation resistance detected by the resistance detector 31, the image taken by the camera 32 and the air pressure detected by the air pressure sensor 33.

[0092] However, the detection device 3 may only include the camera 32, and the control device may only extract the damage features on the surface of the battery pack through image processing techniques (such as edge detection, morphological analysis, etc.) based on the photos taken by the camera 32 to determine whether it is damaged and the location and shape of the damage. Furthermore, these data may be subjected to pre-processing steps such as denoising and enhancement to improve the accuracy of the analysis. In this case, the damage assessment model can still be used to determine the location and shape of the damage.

[0093] In the case where the detection device 3 only includes the camera 32, the damage assessment model is trained using the information of the battery pack shell 2 whose damage position and damage form are known as training data. Specifically, the damage assessment model can be trained using the image feature information related to the form and position of the damaged area of ​​the battery pack shell 2 whose damage position and damage form are known as input, and the damage position and damage form as output.

[0094] Alternatively, the detection device 3 may include only the air pressure sensor 33, and the air pressure sensor 33 may detect the air pressure value inside the battery pack case 2. The control device may detect damage to the battery pack case 2 based only on the internal air pressure of the battery pack case 2 detected by the air pressure sensor 33, and control the heating device 5 to heat the battery pack case. In this case, the damage assessment model may also be used to determine the damage location and form.

[0095] In the case where the detection device 3 only includes the air pressure sensor 33, the damage assessment model is trained using the information of the battery pack shell 2 whose damage position and damage form are known as training data. Specifically, the damage assessment model can be trained using the air pressure value and air pressure change rate of the battery pack shell 2 whose damage position and damage form are known as input, and the damage position and damage form as output.

[0096] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery pack shell repair system (1), characterized in that: include: A battery pack shell (2), the battery pack shell (2) comprising an outer shell (21) and a self-healing material layer (22); A detection device (3), the detection device (3) detecting damage to the battery pack shell (2); A control device, wherein the control device controls the heating device (5) to heat the battery pack shell (2) based on the detected damage to the battery pack shell (2) to stimulate the self-repairing material layer (22) to release the self-repairing material, thereby repairing the damage to the battery pack shell (2).

2. The battery pack casing repair system (1) according to claim 1, characterized in that: The outer shell (21) is formed into a hollow box shape, and the self-repairing material layer (22) is arranged in close contact with the inner surface of the outer shell (21).

3. The battery pack casing repair system (1) according to claim 2, characterized in that: The battery pack housing 2 further comprises an inner housing (23), wherein the inner housing (23) is located inside the self-healing material layer (22), thereby sandwiching the self-healing material layer (22) together with the outer housing (21).

4. The battery pack shell repair system (1) according to any one of claims 1 to 3, characterized in that: The self-healing material layer (22) comprises a capsule, wherein the capsule comprises a capsule film and the self-healing material contained in the capsule film, and the capsule film melts when heated, thereby releasing the self-healing material.

5. The battery pack casing repair system (1) according to claim 1, characterized in that: The heating device (5) comprises a resistor (51) for heating the battery pack housing (2). The resistor (51) generates heat by supplying power from a battery module (6) disposed inside the battery pack housing (2).

6. The battery pack casing repair system (1) according to claim 5, characterized in that: The heating device (5) is provided with a plurality of resistors (51), The plurality of resistors (51) are respectively arranged at different positions of the self-healing material layer (22). The control device controls each resistor (51) individually, thereby achieving heating of different positions of the self-healing material layer (22).

7. The battery pack casing repair system (1) according to claim 5 or 6, characterized in that: The battery module (6) comprises a plurality of battery cells (61), and the plurality of battery cells (61) form a battery balancing system through a circuit. The battery balancing system comprises a balancing resistor (511) connected to each of the battery cells (61). When a voltage difference occurs between the battery cells (61), the balancing resistor (511) is used to discharge the battery cell (61) with a higher voltage. The battery pack housing (2) is heated by using the equalizing resistor (511) as the resistor (51).

8. The battery pack casing repair system (1) according to any one of claims 1 to 3, characterized in that: The detection device (3) comprises a resistance detector (31), wherein the resistance detector (31) detects the insulation resistance of the battery pack housing (2). The control device detects damage to the battery pack shell (2) based on the insulation resistance value.

9. The battery pack casing repair system (1) according to any one of claims 1 to 3, characterized in that: The detection device (3) comprises a camera (32), wherein the camera (32) is arranged at a position capable of photographing the battery pack housing (2) and sending the photographed image to the control device. The control device detects damage to the battery pack housing (2) based on the captured image.

10. The battery pack casing repair system (1) according to any one of claims 1 to 3, characterized in that: The detection device comprises an air pressure sensor (33), wherein the air pressure sensor (33) is installed inside the battery pack housing (2) to detect the internal air pressure of the battery pack housing (2). The control device detects damage to the battery pack casing (2) based on the internal air pressure.

11. The battery pack casing repair system (1) according to any one of claims 1 to 3, characterized in that: The detection device (3) comprises: a resistance detector (31), the resistance detector (31) detecting the insulation resistance of the battery pack shell (2); a camera (32), the camera (32) being arranged at a position capable of photographing the battery pack shell (2) and sending the photographed picture to the control device; and an air pressure sensor (33), the air pressure sensor (33) being installed inside the battery pack shell (2) to detect the internal air pressure of the battery pack shell (2). The control device detects damage to the battery pack housing (2) based on the insulation resistance detected by the resistance detector (31), the image captured by the camera (32), and the air pressure detected by the air pressure sensor (33).

12. The battery pack casing repair system (1) according to claim 11, characterized in that: The control device stores a damage assessment model, The damage assessment model calculates the change amount and change rate of the insulation resistance, and uses the insulation resistance, the change amount of the insulation resistance and the change rate of the insulation resistance as resistance characteristic information. The damage assessment model extracts image feature information related to the shape and position of the damaged area based on the image. The damage assessment model uses the air pressure value and air pressure change rate of the internal air pressure as airtightness characteristic information. The damage assessment model detects damage to the battery pack housing (2) based on the image feature information, the resistance feature information and the airtightness feature information.

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