Battery pack deformation detection device and battery assembly

Abstract

The utility model provides a battery pack deformation detection device and a battery assembly.The battery pack deformation detection device comprises at least one conductor fiber and a fixing film, the fixing film is arranged to be an insulating film capable of deforming, and the conductor fiber is fixedly laid on the fixing film; when the fixing film deforms, the conductor fibers are driven to deform.

Description

Technical Field

[0001] The present application relates to the technical field of battery pack fault detection, and in particular, to a battery pack deformation detection device and a battery assembly. Background Art

[0002] As the main power source of new energy vehicles, the safety of batteries in daily use is particularly important for the passive safety of the entire vehicle. Known battery fault detection systems can usually detect battery pack failures and notify users only when or after a battery pack failure occurs, such as when the battery pack leaks, has thermal runaway, catches fire, and other problems. However, when the battery pack is deformed and has a high risk of causing the above-mentioned obvious failures, it is difficult to perform pre-detection and provide warnings to users to remind them to check or replace the battery pack.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] According to different aspects, one of the purposes of the present application is to detect the deformation of a battery pack to provide an early warning of a battery pack failure.

[0005] In addition, the present application is also intended to solve or alleviate other technical problems existing in the prior art.

[0006] According to one aspect of the present application, there is provided:

[0007] A battery pack deformation detection device includes at least one conductor fiber and a fixed film, wherein the fixed film is configured as a deformable insulating film, and the conductor fiber is fixedly laid on the fixed film so that when the fixed film is deformed, the conductor fiber is also deformed.

[0008] According to another aspect of the present application, the present application provides a battery assembly, wherein the battery assembly has a battery pack and the battery pack deformation detection device described above, and the battery pack deformation detection device is fixedly applied to the surface of the battery pack through the fixing film.

[0009] Benefits of this application include:

[0010] The battery pack deformation detection device of the present application utilizes a combination of conductive fibers and a fixed film applied to the battery pack to determine whether the battery pack is deformed. When the battery pack is deformed, it can simply detect whether the battery pack is in a deformed state based on changes in the resistance value of the conductive fibers, thereby reducing the risk of battery failure or thermal accidents due to battery pack deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above and other features of the present application will become apparent with reference to the accompanying drawings, in which:

[0012] Figure 1 A schematic structural diagram of a battery pack deformation detection device according to an embodiment of the present application is shown;

[0013] Figure 2 A schematic structural diagram of a battery pack deformation detection device according to another embodiment of the present application is shown;

[0014] Figure 3 A schematic structural diagram of a battery assembly proposed according to an embodiment of another aspect of the present application is shown. DETAILED DESCRIPTION

[0015] It is easy to understand that according to the technical solution of the present application, without changing the essential spirit of the present application, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as the entirety of the present application or as a limitation or restriction on the technical solution of the present application.

[0016] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", "third", etc. or similar expressions are only used for description and distinction purposes, and cannot be understood as indicating or implying the relative importance of the corresponding components or the order or assembly order of the components.

[0017] refer to Figure 1 , which shows a schematic diagram of the structure of a battery pack deformation detection device 100 proposed according to an embodiment of one aspect of the present application. The battery pack deformation detection device 100 is used to detect the deformation of the battery pack 200, including but not limited to the deformation of the battery pack 200 such as bulging, skewness, breakage, scratches, etc. In this embodiment, the battery pack deformation detection device 100 includes at least one conductor fiber 1 (in Figure 1Only one conductor fiber is schematically shown in the figure) and the fixed film 2. The fixed film 2 is configured as an insulating film, which can be deformed to a certain extent and can be torn when the tension is large. The conductor fiber 1 is fixedly laid on the fixed film 2, especially adhered to the fixed film 2 in its extension direction, so that when the fixed film 2 is deformed, the conductor fiber 1 is also deformed. The battery pack deformation detection device 100 is adhered to the surface of the battery pack 200 through the fixed film 2. In this way, when the surface of the battery pack 200 is deformed, such as bulging, the fixed film 2 attached to the surface of the battery pack 200 will deform with the battery pack 200, or be torn when the deformation of the battery pack is large. At the same time, the conductor fiber 1 fixed on the fixed film 2 will also deform with the fixed film 2 (usually the conductor fiber 1 is stretched when the fixed film 2 is deformed), or be pulled apart (for example, when the fixed film 2 is torn). At this time, the resistance of the conductor fiber 1 will change due to its deformation. By detecting the change in the resistance of the conductor fiber 1, it can be determined whether the battery pack 200 has been deformed.

[0018] It should be understood that the "deformation" in the "battery pack deformation detection mechanism" mentioned in this application should not be understood only as the geometric change of the overall shape of the battery pack, but should also include situations such as battery pack damage, scratches, etc. that affect the surface shape of the battery pack.

[0019] In one embodiment of the present application, the fixing film 2 has two layers, and the conductor fiber 1 is sandwiched between the two layers of the fixing film 2 and is respectively bonded to the two layers of the fixing film 2. The two layers of the fixing film 2 can better fix the conductor fiber 1 so that it will not easily move relative to the fixing film 2, so that when the fixing film 2 is deformed or broken, it is ensured that the conductor fiber 1 is also driven by the fixing film 2 to deform or break.

[0020] In one embodiment of the present application, the conductor fiber 1 has an input portion 11, an output portion 12, and a bending portion 13 connected between the input portion 11 and the output portion 12. The bending portion 13 is arranged between two layers of fixed films 2, and the input portion 11 and the output portion 12 are respectively located at the two ends of the bending portion 13, and extend from the fixed film 2 by the bending portion 13 at the same position of the fixed film 2. This arrangement is conducive to easily connecting the input portion 11 and the output portion 12 of the conductor fiber 1 to the resistance measurement circuit without the need to add additional connecting conductors. The structure of the bending portion 13 is to increase the contact area between the conductor fiber 1 and the fixed film 2, and further to increase the coverage area of ​​the conductor fiber 1 on the surface of the battery pack 200. Therefore, the bending portion 13 of the conductor fiber 1 covers as much area of ​​the fixed film 2 as possible, so that the deformation of the fixed film 2 at various positions covering the surface of the battery pack 200 can be detected as much as possible. Figure 1In the embodiment, the fixed film 2 is configured in a rectangular shape, and the bend 13 is configured in a rectangular pulse shape, so that the bend 13 covers as much area of ​​the fixed film 2 as possible. Of course, it should be understood that the fixed film 2 can also be configured in other shapes, such as a circle or other irregular shapes, and the bend 13 can also be configured in other shapes accordingly to better cover the area of ​​the fixed film 2. For example, in a circular fixed film, the bend can be configured in a spiral maze shape that is spirally wound.

[0021] In one embodiment of the present application, the conductor fiber 1 is made of carbon fiber or copper fiber, which can conduct electricity and has a certain resistance. When the conductor fiber 1 is stretched (that is, when the cross-sectional area is reduced), its resistance value increases. An insulating layer is provided on the surface of the conductor fiber 1 to prevent short circuits between adjacent conductor fibers 1.

[0022] In one embodiment of the present application, the fixing film 2 is made of TPU (Thermoplastic polyurethanes).

[0023] refer to Figure 2 , which shows a schematic structural diagram of a battery pack deformation detection device proposed in accordance with another embodiment of the present application, Figure 2 In the embodiment of the present invention, the battery pack deformation detection device 110 includes a plurality of conductive fibers 10 (in Figure 2 4 in the figure), accordingly, detection areas 201 respectively matching these conductor fibers 10 are arranged on the fixed film 20. The bending portion of each conductor fiber 10 is arranged in a corresponding detection area 201. In this way, the fixed film 20 can be divided into multiple areas 201, and a conductor fiber 10 is used for detection for each area 201. These detection areas 201 of the fixed film 20 also correspond to different areas on the surface of the battery pack 200 when arranged on the battery pack 200. Therefore, by detecting that the resistance value of one or several conductor fibers 10 increases or is disconnected, it can be accurately determined that the detection area 201 corresponding to this or these conductor fibers 10 on the fixed film 20 has been deformed or torn, and it can be inferred that the corresponding area on the surface of the battery pack 200 has been deformed. By arranging multiple conductor fibers 10 and dividing multiple detection areas 201 on the fixed film 20, the battery pack deformation detection device 110 can further realize the detection of deformation at different areas of the battery pack 200, and refine the detection accuracy range.

[0024] Another aspect of the present application also provides a battery assembly 1000. Figure 3, which shows a schematic structural diagram of a battery assembly 1000 proposed according to an embodiment of another aspect of the present application. The battery assembly 1000 includes the above-mentioned battery pack deformation detection device 100, 110 and a battery pack 200, and the battery pack deformation detection device 100, 110 is fixedly applied, especially bonded to the surface of the battery pack 200 through the fixing film 2, 20, so that when the battery pack 200 is deformed, the deformation of its surface drives the deformation of the fixing film 2, 20, thereby driving the deformation of the conductive fibers 1, 10, especially stretching or breaking them.

[0025] In one embodiment of another aspect of the present application, the battery assembly 1000 further includes a resistance measuring mechanism 300, which is connected to the conductor fibers 1 and 10 to measure the resistance of the conductor fibers 1 and 10. The resistance measuring mechanism 300 is particularly connected to the input portion 11 and the output portion 12 of the conductor fiber 1, so as to detect the resistance of the conductor fiber 1. When there are multiple conductor fibers 10, if it is only to detect whether the battery pack 200 as a whole is deformed, the multiple conductor fibers 10 can be connected in parallel to the resistance measuring mechanism 300 to detect whether the total resistance in parallel has changed. If it is necessary to detect the deformation area of ​​the battery pack 200, each of the multiple conductor fibers 10 can be connected to the resistance measuring mechanism 300 in turn to detect whether the resistance of each conductor fiber 300 has changed.

[0026] In one embodiment of another aspect of the present application, the battery assembly 1000 further includes a control unit 400, which is communicatively connected to the resistance measuring mechanism 300. The control unit 400 determines whether the battery pack 200 is deformed according to the measurement results of the resistance values ​​of the conductor fibers 1 and 10 by the resistance measuring mechanisms 100 and 110. The initial resistance value of the conductor fibers 1 and 10 in a normal state is preset in the control unit 400, and the initial resistance value is compared with the resistance of the conductor fibers 1 and 10 currently measured by the resistance measuring mechanisms 100 and 110. If the currently measured resistance of the conductor fibers 1 and 10 is greater than the initial resistance or the conductor fibers 1 and 10 are disconnected (the resistance is positive infinity), the control unit 400 determines that the battery pack is deformed and notifies the user to check or replace the battery pack 200. Of course, the degree of deformation of the conductor fibers 1 and 10 can also be inferred according to the change in the resistance values ​​of the conductor fibers 1 and 10, so that the degree of deformation of the battery pack 200 can also be inferred to a certain extent. The control unit 400 can be integrated into the electronic control unit of the whole vehicle, for example.

[0027] It should be understood that the above-mentioned battery pack deformation detection mechanisms 100, 110 can also be used for deformation detection of other vehicle components, such as doors, trunk lids and other components. In this case, the battery pack deformation detection mechanisms 100, 110 are also applied to these components through fixed films 2, 20, and the deformation of these components is detected according to the same principle.

[0028] It should be understood that all the above preferred embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present application should be within the legal protection scope of the present application.

Claims

1. A battery pack deformation detection device (100), characterized in that: The invention comprises at least one conductor fiber (1) and a fixing film (2), wherein the fixing film (2) is configured as a deformable insulating film, and the conductor fiber (1) is fixedly laid on the fixing film (2), so that when the fixing film (2) is deformed, the conductor fiber (1) is also deformed.

2. The battery pack deformation detection device (100) according to claim 1, characterized in that: The fixing film (2) has two layers, and the conductor fiber (1) is bonded between the two layers of the fixing film (2).

3. The battery pack deformation detection device (100) according to claim 2, characterized in that: The conductor fiber (1) comprises an input portion (11), an output portion (12) and a bending portion (13) connected between the input portion (11) and the output portion (12); the bending portion (13) is arranged between two layers of fixed films (2); the input portion (11) and the output portion (12) extend from the fixed film (2) at the same position of the fixed film (2) through the bending portion (13).

4. The battery pack deformation detection device (100) according to claim 3, characterized in that: The bend (13) is configured in the shape of a rectangular pulse.

5. The battery pack deformation detection device (100) according to claim 1, characterized in that: The conductor fiber (1) is made of carbon fiber or copper fiber.

6. The battery pack deformation detection device (100) according to claim 1, characterized in that: The fixing film (2) is made of TPU.

7. The battery pack deformation detection device (100) according to claim 3, characterized in that: The battery pack deformation detection device includes a plurality of conductor fibers, and detection areas respectively matching each conductor fiber are provided on the fixing film, and the bending portion of each conductor fiber is arranged in a corresponding detection area.

8. A battery assembly (1000), characterized in that: The battery assembly (1000) comprises a battery pack (200) and a battery pack deformation detection device (100) according to any one of claims 1 to 7, wherein the battery pack deformation detection device (100) is fixedly applied to the surface of the battery pack (200) via the fixing film (2).

9. The battery assembly (1000) according to claim 8, characterized in that: The battery assembly (1000) further comprises a resistance measuring mechanism (300) which is connected to the conductor fiber (1) to measure the resistance of the conductor fiber (1).

10. The battery assembly (1000) according to claim 9, characterized in that: The battery assembly (1000) further comprises a control unit (400) which is in communication connection with the resistance measuring mechanism (300); when the resistance measuring mechanism (300) measures that the resistance of the conductor fiber (1) increases or the conductor fiber (1) is broken, the control unit (400) determines that the battery pack (200) is deformed.

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