Battery expansion force testing device and system and battery module

Abstract

The utility model relates to a battery expansion force testing device, a battery expansion force testing system and a battery module, in the device, a pressure sensing module is arranged in a battery pack to be tested, and the pressure sensing module is used for detecting the pressure of at least one single cell in the battery pack to be tested; the pressure adjusting assembly is arranged outside the to-be-tested battery pack and is used for applying a pre-tightening force to the to-be-tested battery pack so as to test the expansibility of the corresponding single cells in the to-be-tested battery pack. According to the application, the pressure sensing module is arranged in the to-be-detected battery pack, and the pressure adjusting assembly is arranged outside the to-be-detected battery pack, so that the expansion force of the corresponding single battery cells in the actual application scene of the to-be-detected battery pack is monitored, and the expansion force distribution of each single battery cell in the to-be-detected battery pack can be detected; the expansive force testing accuracy is improved, and the expansive force testing result can simulate and reflect the module expansive force of a real use scene.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery expansion force testing device, system, and battery module. Background Art

[0002] A battery module is composed of several individual cells. During the charging and discharging process, these cells generate heat, causing the internal materials of the cells to expand. If the expansion force exceeds the resistance of the battery module casing, the battery module may explode or catch fire.

[0003] Currently, existing expansion force tests on battery modules usually test the total expansion force within the battery module. The expansion force test results differ significantly from the module expansion force in actual usage scenarios, resulting in low accuracy in the expansion force test. Utility Model Content

[0004] Based on this, a battery expansion force testing device, system and battery module are provided.

[0005] In a first aspect, the present application provides a battery expansion force testing device, comprising:

[0006] A pressure sensing module is provided in the battery pack to be tested and is used to detect the pressure of at least one single cell in the battery pack to be tested;

[0007] The pressure regulating assembly is arranged outside the battery pack to be tested and is used to apply a pre-tightening force to the battery pack to be tested.

[0008] In one embodiment, the pressure sensing module includes at least one pressure sensor;

[0009] At least one pressure sensor is arranged between two adjacent single cells in the battery pack to be tested.

[0010] In one embodiment, the battery pack to be tested includes a first filling member, and the first filling member is arranged between two adjacent single battery cells;

[0011] At least one pressure sensor is arranged between adjacent single cells and the first filling piece, a first surface of the pressure sensor abuts against the corresponding first filling piece, and a second surface of the pressure sensor abuts against the corresponding single cell.

[0012] In one embodiment, the battery pack to be tested further includes an end plate;

[0013] At least one pressure sensor is arranged between adjacent end plates and single cells.

[0014] In one embodiment, the battery pack to be tested further includes a second filling member, and the second filling member is disposed between adjacent end plates and single cells;

[0015] At least one pressure sensor is arranged between adjacent single cells and the second filling piece, a first surface of the pressure sensor abuts against the corresponding second filling piece, and a second surface of the pressure sensor abuts against the corresponding single cell.

[0016] In one embodiment, the pressure sensor is a thin film pressure sensor.

[0017] In one embodiment, the pressure regulating assembly includes at least two fastening straps; each fastening strap is strapped to the outside of the battery pack to be tested at intervals;

[0018] The connecting line of the pressure sensing module is led out from between two adjacent fastening belts.

[0019] In one embodiment, the pressure regulating assembly includes a clamping device;

[0020] The clamping device is arranged outside the battery pack to be tested.

[0021] In a second aspect, the present application provides a battery expansion force testing system, comprising a control device and a battery expansion force testing device as described above; the control device is connected to a pressure sensing module.

[0022] In a third aspect, the present application provides a battery module, comprising a battery pack and a battery expansion force testing device as described above; a pressure sensing module is disposed in the battery pack, and the pressure sensing module is used to detect the pressure of at least one single cell in the battery pack;

[0023] The pressure regulating assembly is arranged outside the battery pack and is used to apply a pre-tightening force to the battery pack.

[0024] One of the above technical solutions has the following advantages and beneficial effects:

[0025] The above-mentioned battery expansion force testing device includes a pressure sensing module and a pressure regulating assembly. The pressure sensing module is arranged inside the battery pack to be tested, and the pressure sensing module is used to detect the pressure of at least one single cell in the battery pack to be tested; the pressure regulating assembly is arranged outside the battery pack to be tested, and the pressure regulating assembly is used to apply a pre-tightening force to the battery pack to be tested, thereby realizing an expansion force test of the corresponding single cell in the battery pack to be tested. This application monitors the expansion force of the corresponding single cell in the actual application scenario of the battery pack to be tested by setting a pressure sensing module inside the battery pack to be tested and setting a pressure regulating assembly outside the battery pack to be tested, thereby being able to detect and obtain the expansion force distribution of each single cell in the battery pack to be tested, thereby improving the accuracy of the expansion force test and enabling the expansion force test results to simulate and reflect the module expansion force in the actual usage scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a first structural schematic diagram of a battery expansion force testing device in an embodiment of the present application;

[0027] Figure 2 This is a second structural schematic diagram of the battery expansion force testing device in an embodiment of the present application;

[0028] Figure 3 This is a third structural schematic diagram of the battery expansion force testing device in an embodiment of the present application;

[0029] Figure 4 This is a fourth structural schematic diagram of the battery expansion force testing device in an embodiment of the present application.

[0030] Reference numerals:

[0031] 10. Pressure sensing module; 110. Pressure sensor; 20. Pressure regulating assembly; 210. Fastening belt; 220. Clamping device; 30. Battery pack to be tested; 310. Single cell; 320. First filler; 330. Second filler; 340. End plate. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0033] It should be noted that the terms "first," "second," and the like in the specification and claims of the present application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numerals used in this manner are interchangeable where appropriate for the embodiments of the present application described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover inclusions that are not listed. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products, or apparatus.

[0034] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0035] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0036] Additionally, the term "plurality" shall mean two or more.

[0037] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] In one embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, a battery expansion force testing device is provided, including a pressure sensing module 10 and a pressure regulating assembly 20. The pressure sensing module 10 is arranged in the battery pack 30 to be tested, and the pressure sensing module 10 is used to detect the pressure of at least one single cell 310 in the battery pack 30 to be tested; the pressure regulating assembly 20 is arranged outside the battery pack 30 to be tested, and the pressure regulating assembly 20 is used to apply a pre-tightening force to the battery pack 30 to be tested.

[0039] Among them, the battery pack 30 to be tested may include a number of single cells 310. For example, the battery pack 30 to be tested may be composed of a number of single cells 310 connected in series and / or in parallel. The single cell 310 may be, but is not limited to, a lithium-ion cell; for example, the single cell may be a lithium iron phosphate cell, a ternary cell, or a manganese iron lithium cell. The single cell 310 may also be a lithium metal cell or a sodium-ion cell. The single cell 310 may be a square structure. For example, each single cell 310 may be arranged in a row and multiple columns or in multiple rows and multiple columns. Exemplarily, the single cell 310 has four sides, and the four sides can be divided into two sides with larger areas (i.e., large sides) and two sides with smaller areas (i.e., small sides), and the corresponding large sides of two adjacent single cells 310 are arranged close to each other.

[0040] The pressure sensing module 10 may be composed of a plurality of pressure sensors 110. The pressure sensing module 10 is disposed within the battery pack 30 to be tested. For example, the pressure sensing module 10 may be attached to the large side surface of a corresponding single cell 310 of the battery pack 30 to be tested. The pressure sensing module 10 can then perform pressure testing on at least one single cell 310 in the battery pack 30 to be tested, thereby obtaining the expansion force of the corresponding single cell 310. For example, the pressure sensing module 10 can perform pressure testing on each single cell 310 in the battery pack 30 to be tested, thereby obtaining the expansion force of each single cell 310 in the battery pack 30 to be tested. Based on the expansion force of each single cell 310, the actual expansion force of the battery pack 30 to be tested after being assembled into a battery module can be determined.

[0041] The pressure regulating assembly 20 is disposed externally to the battery pack 30 under test to apply a preload force to the battery pack 30 under test, simulating the tightening force experienced by the battery pack 30 when assembled into a corresponding battery module. This ensures that the expansion force test results of the battery pack 30 under test meet the time application scenarios of the corresponding battery module, thereby improving the accuracy of the expansion force test of the battery pack 30 under test. The pressure regulating assembly 20 can apply a corresponding preload force to the corresponding battery pack 30 under test based on the tightening force requirements of each battery pack 30 under test.

[0042] Exemplarily, the expansion force test process of the battery pack 30 to be tested is as follows: the pressure sensing module 10 is installed on the large side surface of the corresponding single cell 310 in the battery pack 30 to be tested, and the pressure regulating assembly 20 is installed on the outside of the battery pack 30 to be tested provided with the pressure sensing module 10; the battery pack 30 to be tested provided with the pressure sensing module 10 is restrained by the pressure regulating assembly 20 to apply a pre-tightening force to the corresponding battery pack 30 to be tested, simulating the actual tightening state of the battery pack 30 to be tested after being assembled into a battery module; the battery pack 30 to be tested is charged and discharged, and the pressure of the corresponding single cell 310 in the battery pack 30 to be tested is detected by the pressure sensing module 10, and then the expansion force test result of the battery pack 30 to be tested can be obtained, thereby realizing the expansion force test under the actual application scenario of the simulation battery module, monitoring the expansion force of the corresponding single cell 310 under the actual application scenario, and improving the accuracy of the expansion force test of the battery module.

[0043] In the above-mentioned embodiment, a pressure sensing module 10 is provided in the battery pack 30 to be tested, and the pressure sensing module 10 is used to detect the pressure of at least one single cell 310 in the battery pack 30 to be tested; a pressure regulating assembly 20 is provided outside the battery pack 30 to be tested, and the pressure regulating assembly 20 is provided outside the battery pack 30 to be tested, so as to implement an expansion force test on the corresponding single cell 310 in the battery pack 30 to be tested. The present application monitors the expansion force of the corresponding single cell 310 in the actual application scenario of the battery pack 30 to be tested by providing a pressure sensing module 10 in the battery pack 30 to be tested, and providing a pressure regulating assembly 20 outside the battery pack 30 to be tested, thereby being able to detect and obtain the expansion force distribution of each single cell 310 in the battery pack 30 to be tested, thereby improving the accuracy of the expansion force test and enabling the expansion force test results to simulate and reflect the module expansion force in the actual usage scenario.

[0044] In one embodiment, Figure 1 and Figure 2 As shown, the pressure sensing module 10 includes at least one pressure sensor 110 ; the at least one pressure sensor 110 is disposed between two adjacent single cells 310 in the battery pack 30 to be tested.

[0045] The battery pack 30 to be tested may include at least two single cells 310, each arranged in a row, with the corresponding large side surfaces of two adjacent single cells 310 positioned close to each other. By disposing at least one pressure sensor 110 between two adjacent single cells 310 in the battery pack 30 to be tested, the pressure sensor 110 can detect the pressure of the corresponding single cell 310 and obtain the expansion force of the corresponding single cell 310. Based on the expansion force of each single cell 310, the actual expansion force of the battery pack 30 to be tested after being assembled into a battery module can be determined. It should be noted that the pressure sensor 110 can be installed on the large side surface of the corresponding single cell 310 by gluing or snapping.

[0046] For example, a plurality of pressure sensors 110 may be provided at different positions between two adjacent single cells 310 in the battery pack 30 to be tested, and the pressure sensors 110 may perform pressure detection on the corresponding positions of the corresponding single cells 310 to obtain the expansion forces at different positions of the corresponding single cells 310, thereby realizing the pressure distribution state between the single cells 310 in the battery module and on the large side surfaces of the single cells 310, and measuring the expansion force distribution of the single cells 310 at different positions in the battery module, thereby being able to test the expansion force of the battery module in actual application scenarios.

[0047] For example, the specific testing process is as follows: the pressure sensor 110 is installed on the large side surface of the corresponding single cell 310 in the battery pack 30 to be tested, so that there is at least one pressure sensor 110 between two adjacent single cells 310; the pressure regulating assembly 20 is installed on the outside of the battery pack 30 to be tested, and a pre-tightening force is applied to the battery pack 30 to be tested with the pressure sensor 110 installed through the pressure regulating assembly 20, so that the pressure sensor 110 and the corresponding single cell 310 are in close contact, simulating the actual tightening state of the battery pack 30 to be tested after being assembled into a battery module; by performing charge and discharge tests on the battery pack 30 to be tested, and detecting the pressure of the corresponding single cell 310 in the battery pack 30 to be tested through the pressure sensor 110, the expansion force distribution state at different positions of the corresponding single cell 310 is collected, and then the expansion force test result of the battery pack 30 to be tested can be obtained, thereby simulating the expansion force test of the battery module in the actual application scenario, monitoring the expansion force of the corresponding single cell 310 in the actual application scenario, and improving the accuracy of the battery module expansion force test.

[0048] In one embodiment, Figure 1 、 Figure 2 and Figure 4 As shown, the battery pack 30 to be tested includes a first filling piece 320, and the first filling piece 320 is arranged between two adjacent single cells 310; at least one pressure sensor 110 is arranged between the adjacent single cells 310 and the first filling piece 320, and the first surface of the pressure sensor 110 abuts against the corresponding first filling piece 320, and the second surface of the pressure sensor 110 abuts against the corresponding single cell 310.

[0049] The first filler 320 can be a cushion or isolation pad, for example, a foam pad. By placing the first filler 320 between two adjacent battery cells 310, it provides thermal isolation, preventing heat transfer to other battery cells 310 and reducing the risk of thermal runaway. Furthermore, it reduces direct contact between battery cells 310, minimizing the risk of thermal expansion on the battery module.

[0050] For example, the pressure sensor 110 may be a flat plate structure, and the pressure sensor 110 has a first surface and a second surface, the first surface of the pressure sensor 110 corresponds to the second surface, the first surface of the pressure sensor 110 can be set on the corresponding side surface of the first filling piece 320 by gluing or snapping, and the second surface of the pressure sensor 110 can be set on the large side surface of the corresponding single cell 310 by gluing or snapping; the pressure regulating component 20 is set on the outside of the battery pack 30 to be tested, and then the pressure regulating component 20 applies a pre-tightening force to the battery pack 30 to be tested on which the pressure sensor 110 is installed, so that the first surface of the pressure sensor 110 is firmly attached to the corresponding first filling piece 320, and the second surface of the pressure sensor 110 is firmly attached to the large side surface of the corresponding single cell 310, so as to simulate the actual tightening state of the battery pack 30 to be tested after being assembled into a battery module. Furthermore, by performing charge and discharge tests on the battery pack 30 to be tested after installation, and detecting the pressure between the corresponding first filling piece 320 and the single cell 310 in the battery pack 30 to be tested through the pressure sensor 110, the expansion force distribution state at different positions of the corresponding single cell 310 can be collected, and then the expansion force test results of the battery pack 30 to be tested can be obtained, thereby simulating the expansion force test of the actual application scenario of the battery module with the first filling piece 320, thereby improving the accuracy of the expansion force test of the battery module.

[0051] In one embodiment, Figure 1 and Figure 4 As shown, the battery pack 30 to be tested further includes an end plate 340 ; at least one pressure sensor 110 is disposed between adjacent end plates 340 and single cells 310 .

[0052] Among them, the battery pack 30 to be tested may include two end plates 340, and the two end plates 340 are respectively arranged at the corresponding head and tail ends of the battery pack 30 to be tested. By setting the end plates 340 on the battery pack to be tested, a heat dissipation function can be provided for the battery pack 30 to be tested, and a structural support role can be played for the battery pack 30 to be tested to ensure the electrical and mechanical stability of the battery pack 30 to be tested.

[0053] By setting at least one pressure sensor 110 between adjacent end plates 340 and single cells 310 in the battery pack 30 to be tested, the pressure sensor 110 can perform pressure detection on the corresponding single cells 310 at the head and tail ends of the battery pack 30 to be tested, and obtain the expansion force of the corresponding single cells 310, so as to obtain the expansion force of the corresponding single cells 310 at the head and tail ends of the battery pack 30 to be tested.

[0054] For example, a plurality of pressure sensors 110 may be provided at different positions between adjacent end plates 340 and single cells 310 in the battery pack 30 to be tested, and the pressure sensors 110 may perform pressure detection on corresponding positions of the head and tail single cells 310 to obtain the expansion forces at different positions of the head and tail single cells 310, thereby realizing the pressure distribution state of the head and tail single cells 310 at different positions in the battery module, and being able to test the expansion force of the battery module in actual application scenarios.

[0055] In one embodiment, Figure 1 and Figure 4 As shown, the battery pack 30 to be tested also includes a second filling piece 330, and the second filling piece 330 is arranged between the adjacent end plates 340 and the single cells 310; at least one pressure sensor 110 is arranged between the adjacent single cells 310 and the second filling piece 330, and the first surface of the pressure sensor 110 abuts against the corresponding second filling piece 330, and the second surface of the pressure sensor 110 abuts against the corresponding single cell 310.

[0056] The second filler 330 can be a cushion or an isolation pad, for example, a foam pad. By placing the second filler 330 between adjacent end plates 340 and individual cells 310, it acts as a buffer, reducing the risk of thermal expansion to the corresponding individual cells 310.

[0057] For example, the first surface of the pressure sensor 110 can be set on the corresponding side surface of the second filling piece 330 by gluing or snapping, and the second surface of the pressure sensor 110 can be set on the large side surface of the corresponding single cell 310 by gluing or snapping; the pressure regulating assembly 20 is set on the outside of the battery pack 30 to be tested, and then the pressure regulating assembly 20 applies a pre-tightening force to the battery pack 30 to be tested on which the pressure sensor 110 is installed, so that the first surface of the pressure sensor 110 is firmly and tightly attached to the corresponding second filling piece 330, and the second surface of the pressure sensor 110 is firmly and tightly attached to the large side surface of the corresponding single cell 310, thereby simulating the actual tightening state of the battery pack 30 to be tested after being assembled into a battery module, so that the pressure sensor 110 can detect the pressure between the corresponding second filling piece 330 and the single cell 310 in the battery pack 30 to be tested, and collect the expansion force distribution state at different positions of the corresponding single cell 310, thereby simulating the expansion force test in the actual application scenario of the battery module with the second filling piece 330, thereby improving the accuracy of the expansion force test of the battery module.

[0058] In one embodiment, the pressure sensor 110 is a thin film pressure sensor 110 .

[0059] For example, the thin film pressure sensor 110 has a first and a second opposing surface, and the area of ​​the first surface (or the second surface) of the thin film pressure sensor 110 is less than or equal to the area of ​​the larger side surface of the corresponding cell. At least one thin film pressure sensor 110 is disposed between two adjacent cells 310, and the pressure regulating assembly 20 is disposed outside the battery pack 30 to apply a preload force to the battery pack 30, thereby simulating the actual tightening state of the battery pack 30 after being assembled into a battery module. Each thin film pressure sensor 110 monitors the expansion force of the corresponding cell 310 in actual application scenarios of the battery pack 30, thereby capturing the expansion force distribution of the larger side surface of the corresponding cell 310 and the expansion force between the larger side surfaces of cells 310 at different locations. This allows for the detection of the expansion force distribution of each cell 310 within the battery pack 30, improving the accuracy of the expansion force test. This allows the expansion force test results to simulate the module expansion force in real-world usage scenarios, simplifying the testing and installation of the battery pack 30.

[0060] In one embodiment, Figure 2 and Figure 3 As shown, the pressure regulating assembly 20 includes at least two fastening straps 210 ; each fastening strap 210 is bundled outside the battery pack 30 to be tested at intervals; and the connection line of the pressure sensing module 10 is led out from between two adjacent fastening straps 210 .

[0061] The fastening belt 210 may be a metal fastening belt 210 , for example, the fastening belt 210 may be a steel belt.

[0062] Exemplarily, the pressure regulating assembly 20 may include a first tightening strap 210 and a second tightening strap 210; the first tightening strap 210 and the second tightening strap 210 are bundled at intervals outside the battery pack 30 to be tested, so as to apply a pre-tightening force to the battery pack 30 to be tested, thereby simulating the tightening state of the battery pack 30 to be tested after being assembled into a battery module, and simulating the actual application scenario of the battery pack 30 to be tested, so that the pressure sensing module 10 can detect the pressure of the corresponding single cell 310 in the battery pack 30 to be tested, and simulate the expansion force test under the actual application scenario of the battery module, thereby improving the accuracy of the expansion force test of the battery module.

[0063] The first and second fastening straps 210, 210, are respectively strapped to the outside of the battery pack 30 to be fastened, with the first fastening strap 210 positioned adjacent to the top surface of the battery pack 30, and the second fastening strap 210 positioned adjacent to the bottom surface of the battery pack 30. By routing the connecting wires of the pressure sensing module 10 between the first and second fastening straps 210, interference with the first fastener (or second fastener) is avoided, thereby not affecting the conductive bar welding and the arrangement of other sensing components on the top surface of the battery pack 30. It should be noted that the connecting wires of the pressure sensing module 10 refer to the signal wiring harness of the pressure sensing module 10.

[0064] The connection wires of the pressure sensing module 10 can be led out from the left or right side of the battery pack 30 under test, and are located between two adjacent fastening straps 210 to avoid interference with the fastening straps 210. It should be noted that the left side of the battery pack 30 under test refers to the side corresponding to the small side of the single cell 310; the right side of the battery pack 30 under test is opposite to the left side.

[0065] In one embodiment, Figure 4 As shown, the pressure regulating assembly 20 includes a clamping device 220 ; the clamping device 220 is disposed outside the battery pack 30 to be tested.

[0066] The clamping device 220 can be a battery module expansion force test fixture. By mounting the battery pack 30 to be tested, equipped with the pressure sensing module 10, on the clamping device 220, and applying a pre-tightening force to the battery pack 30 to be tested, the clamping device 220 simulates the tightening state of the battery pack 30 after being assembled into a battery module. This simulates the actual application scenario of the battery pack 30 to be tested, improves the convenience of testing and installing the battery pack 30 to be tested, and furthermore, the pressure sensing module 10 can detect the pressure of the corresponding single cells 310 in the battery pack 30 to simulate the expansion force test in the actual application scenario of the battery module.

[0067] In one embodiment, a battery expansion force testing system is further provided, comprising a control device and any one of the battery expansion force testing devices described above; the control device is connected to a pressure sensing module.

[0068] Among them, the control device can be used to obtain the pressure acquisition signal of the pressure sensing module, and then determine the expansion force test result of the battery pack to be tested based on the pressure acquisition signal; the control device can also be used to perform charge and discharge tests on the battery pack to be tested.

[0069] For detailed description of the battery pack to be tested and the battery expansion force testing device, reference may be made to the detailed description of the battery pack to be tested and the battery expansion force testing device in the above embodiments, which will not be repeated here.

[0070] In the above embodiment, the control device is connected to the pressure sensing module, which is connected to the battery pack to be tested. The pressure sensing module is arranged in the battery pack to be tested, and the pressure sensing module is used to detect the pressure of at least one single cell in the battery pack to be tested; the pressure regulating component is arranged outside the battery pack to be tested, and the pressure regulating component is used to apply a pre-tightening force to the battery pack to be tested, thereby realizing an expansion force test of the corresponding single cell in the battery pack to be tested. The present application monitors the expansion force of the corresponding single cell in the actual application scenario of the battery pack to be tested by arranging a pressure sensing module in the battery pack to be tested and arranging the pressure regulating component outside the battery pack to be tested, thereby realizing the detection and obtaining of the expansion force distribution of each single cell in the battery pack to be tested, thereby improving the accuracy of the expansion force test, and enabling the expansion force test result to simulate and reflect the module expansion force in the actual usage scenario.

[0071] In one embodiment, a battery module is further provided, comprising a battery pack and a battery expansion force testing device as described above; a pressure sensing module is disposed within the battery pack, the pressure sensing module being used to detect the pressure of at least one single cell in the battery pack; and a pressure regulating assembly is disposed outside the battery pack, the pressure regulating assembly being used to apply a pre-tightening force to the battery pack.

[0072] Among them, the battery module can be a lithium metal battery module, a lithium ion battery module or a sodium ion battery module. The battery pack may include a plurality of single cells. For example, the battery pack may be composed of a plurality of single cells connected in series and / or in parallel. The single cells may be a square structure. For example, each single cell may be arranged in a row and multiple columns or multiple rows and multiple columns. Exemplarily, the single cell has four sides, and the four sides can be divided into two sides with larger areas (i.e., large sides) and two sides with smaller areas (i.e., small sides), and the corresponding large sides of two adjacent single cells are arranged close to each other.

[0073] For example, by installing the pressure sensing module on the large side surface of the corresponding single cell in the battery pack, installing the pressure regulating assembly on the outside of the battery pack provided with the pressure sensing module, and restraining the battery pack provided with the pressure sensing module through the pressure regulating assembly to apply a pre-tightening force to the corresponding battery pack, the bus is welded to the battery pack after the pre-tightening force is applied to assemble a battery module, and then the pressure of the corresponding single cell in the battery pack can be detected by the pressure sensing module, and then the expansion force result of the battery pack can be detected, thereby realizing the expansion force detection of the battery module in the actual application scenario, and improving the accuracy of the expansion force detection of the battery module.

[0074] It should be noted that the battery module may further include components such as a temperature regulating device. A specific battery module may include more components than those described in the above embodiments, or combine certain components, or have a different component arrangement.

[0075] The technical features of the above embodiments can 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.

[0076] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery expansion force testing device, characterized in that: include: A pressure sensing module, the pressure sensing module being disposed in the battery pack to be tested and being used to detect the pressure of at least one single cell in the battery pack to be tested; A pressure regulating assembly is provided outside the battery pack to be tested and is used to apply a pre-tightening force to the battery pack to be tested.

2. The battery expansion force testing device according to claim 1, characterized in that: The pressure sensing module includes at least one pressure sensor; At least one of the pressure sensors is arranged between two adjacent single cells in the battery pack to be tested.

3. The battery expansion force testing device according to claim 2, characterized in that: The battery pack to be tested includes a first filling piece, and the first filling piece is arranged between two adjacent single battery cells; At least one pressure sensor is disposed between adjacent single cells and the first filling member, a first surface of the pressure sensor abuts against the corresponding first filling member, and a second surface of the pressure sensor abuts against the corresponding single cell.

4. The battery expansion force testing device according to claim 2, characterized in that: The battery pack to be tested further includes an end plate; At least one of the pressure sensors is disposed between adjacent end plates and the single battery cells.

5. The battery expansion force testing device according to claim 4, characterized in that: The battery pack to be tested further includes a second filling piece, and the second filling piece is provided between the adjacent end plates and the single battery cells; At least one pressure sensor is disposed between adjacent single cells and the second filling member, a first surface of the pressure sensor abuts against the corresponding second filling member, and a second surface of the pressure sensor abuts against the corresponding single cell.

6. The battery expansion force testing device according to claim 2, characterized in that: The pressure sensor is a thin film pressure sensor.

7. The battery expansion force testing device according to any one of claims 1 to 6, characterized in that: The pressure regulating assembly includes at least two fastening straps; each of the fastening straps is strapped to the outside of the battery pack to be tested at intervals; The connection line of the pressure sensing module is led out from between two adjacent fastening belts.

8. The battery expansion force testing device according to any one of claims 1 to 6, characterized in that: The pressure regulating assembly includes a clamping device; The clamping device is arranged outside the battery pack to be tested.

9. A battery expansion force testing system, characterized in that: It comprises a control device and a battery expansion force testing device as described in any one of claims 1 to 8; the control device is connected to a pressure sensing module.

10. A battery module, characterized in that: A battery pack and a battery expansion force testing device according to any one of claims 1 to 7; a pressure sensing module is provided in the battery pack, and the pressure sensing module is used to detect the pressure of at least one single cell in the battery pack; The pressure regulating assembly is arranged outside the battery pack, and the pressure regulating assembly is used to apply a pre-tightening force to the battery pack.

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