Battery cell test fixture and battery test device

Abstract

The utility model relates to the technical field of battery automatic production equipment, in particular to a battery cell test fixture and a battery test device.The battery cell test fixture comprises a locking part and at least two clamping bodies, the at least two clamping bodies are sequentially and oppositely arranged in the first direction, and every two adjacent clamping bodies are connected through the locking part; and the locking parts can adjust the distance between the two adjacent clamping bodies in the first direction. The clamping body comprises a plurality of clamping parts which can be detachably connected in sequence in the second direction. According to the battery cell test fixture and the battery test device provided by the invention, the adjustability and adaptability of the test fixture in the thickness direction and the length direction of the battery cell are improved. The improved test fixture can be suitable for testing battery cells with different sizes, the manufacturing cost of the fixture is effectively reduced, and the influence of a customized fixture period on the experiment efficiency is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and in particular to a battery cell testing fixture and a battery testing device. Background Art

[0002] After the trial production of power battery cells, it is necessary to carry out various tests (such as needle puncture test, temperature expansion test, etc.) under the conditions of simulating the installation of power battery cells. Nowadays, the cells to be tested are usually clamped by test fixtures to simulate the installation conditions of the cells.

[0003] However, in order to improve the overall energy density of the battery pack and reduce the space occupied by the power battery pack on the vehicle, during the trial production of the power battery cells, multiple groups of cell solutions of different sizes are usually tested at the same time; or, in different trial production experiments, the cell sizes involved are not the same. This requires the battery test device to be equipped with a variety of test fixtures of different sizes to adapt to cells of different sizes, which greatly increases the production cost of the test fixture and causes a waste of resources; and once the size of the cell to be tested is special, a special test fixture needs to be customized, which increases the time cost of customizing the test fixture, greatly affecting the timeliness of the experiment. Utility Model Content

[0004] The purpose of the present application is to provide a battery cell test fixture and a battery testing device, so as to solve the problems existing in the prior art to a certain extent, that the current test fixtures have poor versatility and need to be equipped with a variety of test fixtures of different sizes to adapt to battery cells of different sizes, which increases the production cost of the test fixtures and causes waste of resources; once the size of the battery cell to be tested is special, a special test fixture needs to be customized, which increases the time cost of custom-made test fixtures in the experiment and greatly affects the technical problems of the efficiency of the experiment.

[0005] According to a first aspect of the present application, a battery cell testing fixture is provided, comprising a locking portion and at least two clamping bodies, wherein the at least two clamping bodies are arranged opposite to each other in sequence along a first direction, two adjacent clamping bodies are connected via the locking portion, and the locking portion can adjust the distance between the two adjacent clamping bodies in the first direction;

[0006] The clamping body includes a plurality of clamping parts, and the plurality of clamping parts can be detachably connected in sequence along a second direction, and the second direction intersects with the first direction.

[0007] Preferably, when the plurality of clamping parts are assembled into the clamping body, the two clamping parts located at the two ends of the clamping body in the second direction are defined as end clamping parts, and the remaining clamping parts located between the two end clamping parts are defined as middle clamping parts;

[0008] The locking portion is arranged on the end clamping portion.

[0009] Preferably, the clamping body further comprises a connecting portion, and two adjacent clamping portions on the same clamping body are detachably connected via the connecting portion.

[0010] Preferably, one end of the end clamping portion facing the middle clamping portion and both ends of the middle clamping portion in the second direction are provided with plug holes, and the plug holes extend toward the inside of the clamping portion along the second direction;

[0011] The connecting portion can be plugged into the plugging holes of two adjacent clamping portions respectively.

[0012] Preferably, the depth of the plug hole in the second direction is greater than or equal to half of the dimension of the connecting portion in the second direction.

[0013] Preferably, the battery cell testing fixture comprises two clamping bodies, and at least one of the intermediate clamping parts included in the two clamping bodies is provided with a puncture hole penetrating through the clamping part along the first direction.

[0014] Preferably, two of the connecting parts that cooperate with the middle clamping part having the puncture hole are provided with avoidance holes, and when the plurality of clamping parts are in an assembled state, the avoidance holes can expose the puncture hole.

[0015] Preferably, the battery cell test fixture comprises three clamping bodies and an expansion force sensor, the three clamping bodies form two clamping gaps, and the locking portion sequentially penetrates the three clamping bodies along the first direction;

[0016] The expansion force sensor is arranged in one of the two clamping gaps, and the other of the two clamping gaps is used to clamp the battery cell to be tested.

[0017] Preferably, the end clamping portion is provided with a connecting through hole penetrating the end clamping portion along the first direction;

[0018] The locking portion includes a locking bolt extending along the first direction and a nut matched with the locking bolt, and the locking bolt can pass through the connecting through hole.

[0019] According to the second aspect of the present application, a battery testing device is provided, comprising the battery cell testing fixture described in any of the above technical solutions, and thus having all the beneficial technical effects of the battery cell testing fixture, which will not be described in detail herein.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] The battery cell test fixture provided by the present application connects two adjacent clamping bodies through a locking portion, thereby achieving the purpose of the test fixture clamping the battery cell to be tested, and the distance between the two adjacent clamping bodies in the first direction is adjusted by the locking portion, so that the test fixture can clamp the battery cells to be tested of different thicknesses; and, by designing multiple clamping parts to be detachably connected along the second direction, the clamping body can adaptively adjust the number of clamping parts of the assembled clamping body according to the length of the battery cell to be tested, thereby improving the adjustability and adaptability of the test fixture in the length direction of the battery cell, thereby achieving that the test fixture improved by the present application can be suitable for testing battery cells of various sizes, effectively reducing the cost of fixture manufacturing and avoiding the influence of the customized fixture cycle on the experimental efficiency.

[0022] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the explosion structure of the battery cell testing fixture provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the explosion structure of the battery cell test fixture provided in an embodiment of the present application in a state of a needle penetration test;

[0026] Figure 3 A schematic diagram of the explosion structure of the battery cell test fixture provided in an embodiment of the present application in a state of expansion test.

[0027] Reference numerals:

[0028] 1-clamping body; 111-end clamping part; 112-middle clamping part; 12-connecting part; 131-connecting through hole; 132-plug hole; 2-locking part; 21-locking bolt; 22-nut; 3-cell to be tested; 41-puncture hole; 42-avoidance hole; 5-expansion force sensor.

[0029] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0030] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0031] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0032] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Refer to the following Figures 1 to 3 A battery cell testing fixture and a battery testing device according to some embodiments of the present application are described.

[0036] See also Figures 1 to 3 As shown, an embodiment of the first aspect of the present application provides a battery cell test fixture, which includes a locking portion 2 and at least two clamping bodies 1, at least two clamping bodies 1 are arranged opposite to each other in sequence along a first direction F1, two adjacent clamping bodies 1 are connected via the locking portion 2, and the locking portion 2 can adjust the distance between two adjacent clamping bodies 1 in the first direction F1. The clamping body 1 includes a plurality of clamping portions, and the plurality of clamping portions can be detachably connected in sequence along a second direction F2, wherein the second direction F2 intersects with the first direction F1.

[0037] According to the battery cell test fixture provided by the above technical features, two adjacent clamping bodies 1 are connected by the locking part 2, so that the purpose of the test fixture to clamp the battery cell 3 to be tested is achieved, and the distance between the two adjacent clamping bodies 1 in the first direction F1 is adjusted by the locking part 2, so that the test fixture can clamp the battery cell 3 to be tested with different thicknesses; and, by designing multiple clamping parts to be detachably connected along the second direction F2, the clamping body 1 can adaptively adjust the number of clamping parts of the assembled clamping body 1 according to the length of the battery cell 3 to be tested, thereby improving the adjustability and adaptability of the test fixture in the length direction of the battery cell, thereby achieving that the test fixture improved by the present application can be suitable for battery cell testing of various sizes, effectively reducing the cost of fixture manufacturing and avoiding the influence of the customized fixture cycle on the experimental efficiency.

[0038] like Figures 1 to 3 As shown, the direction shown by F1 in the figure may be an example of the first direction, and the direction shown by F2 in the figure may be an example of the second direction, wherein the first direction F1 and the second direction F2 intersect. For the convenience of description, the direction perpendicular to the plane determined by the first direction F1 and the second direction F2 is defined as a third direction F3, and the direction shown by F3 in the figure may be an example of the third direction. Preferably, the first direction F1 and the second direction F2 are perpendicular to each other, so as to reduce the space occupied by the test fixture.

[0039] For the sake of ease of description, taking a clamping body 1 as an example, when multiple clamping parts are assembled into the clamping body 1, the two clamping parts located at the two ends of the clamping body 1 in the second direction F2 are defined as end clamping parts 111, and the remaining clamping parts located between the two end clamping parts 111 are defined as intermediate clamping parts 112.

[0040] Preferably, if Figures 1 to 3 As shown, the locking portion 2 may be disposed on the end clamping portion 111 to improve the flexibility and operability of the loading and unloading of the middle clamping portion 112 .

[0041] Preferably, if Figures 1 to 3 As shown, the end clamping portion 111 may be provided with a connecting through hole 131 penetrating the end clamping portion 111 along the first direction F1. At least a portion of the locking portion 2 may penetrate the connecting through hole 131 to achieve connection between the locking portion 2 and the clamping body 1.

[0042] Preferably, if Figure 1 and Figure 3As shown, the locking portion 2 may include a locking bolt 21 extending along a first direction F1 and a nut 22 matching the locking bolt 21. The locking bolt 21 sequentially penetrates all the clamping bodies 1 included in the battery cell testing fixture along the first direction F1 and is then bolted to the nut 22 to achieve locking between the multiple clamping bodies 1.

[0043] Preferably, if Figures 1 to 3 As shown, a plurality of the locking portions 2 can be provided on each of the end clamping portions 111 to improve the clamping strength of the clamp. Figures 1 to 3 An example is shown in which two locking portions are provided on each end clamping portion 111 , but this is not limited thereto, and the number of locking portions 2 provided on each end clamping portion 111 may be adaptively adjusted according to the clamping strength of the clamp.

[0044] Optionally, not shown in the figure, a plurality of nuts 22 may be provided on the above-mentioned locking bolt, and the number of the nuts 22 provided may correspond to the number of the clamping bodies 1 provided. In other words, nuts may be provided between two adjacent clamping bodies to achieve locking between the two adjacent clamping bodies and distance adjustment between the two adjacent clamping bodies.

[0045] However, it is not limited to this. The locking portion 2 is not limited to the form of the locking bolt 21 and the nut 22. As long as the clamping body 1 can be locked in the first direction F1, the locking portion 2 can also be a linear drive member that can be telescopic along the first direction F1, such as an electric telescopic rod, a cylinder, etc.

[0046] In an embodiment, preferably, Figures 1 to 3 As shown, the clamping body 1 may further include a connecting portion 12 , and two adjacent clamping portions on the same clamping body 1 may be detachably connected via the connecting portion 12 .

[0047] Preferably, if Figures 1 to 3 As shown, the end clamping portion 111 has an inserting hole 132 at one end facing the middle clamping portion 112 , and the inserting hole 132 extends toward the inside of the clamping portion along the second direction F2 to facilitate insertion with the connecting portion 12 .

[0048] Similarly, if Figures 1 to 3 As shown, both ends of the middle clamping part 112 in the second direction F2 are provided with the above-mentioned plug-in holes 132, so that the above-mentioned connecting part 12 can be respectively inserted into the two plug-in holes 132 arranged facing each other of the two adjacent clamping parts to achieve the detachable connection of the two adjacent clamping parts. In other words, for the same clamping body 1, its assembly order can be end clamping part 111 ~ connecting part 12 ~ [(middle clamping part 112-connecting part 12)×n] ~ end clamping part 111, where n is a natural number.

[0049] Preferably, the depth of the plug-in hole 132 in the second direction F2 is greater than or equal to half of the size of the connecting portion 12 in the second direction F2. Thus, when the connecting portion 12 is plugged into two adjacent clamping portions, the space formed by the two plug-in holes 132 of the two adjacent clamping portions facing each other can completely hide the connecting portion 12, thereby effectively preventing the connecting portion 12 from being exposed and affecting the clamping effect of the test fixture.

[0050] Preferably, the plug hole 132 may penetrate the clamping portion along the second direction F2, and the length of the connecting portion 12 in the second direction F2 is exactly equal to the length of the clamping portion in the second direction F2, thereby effectively reducing the processing accuracy of the clamping portion and the connecting portion 12.

[0051] Alternatively, if Figures 1 to 3 As shown, the connecting portion 12 may be sheet-shaped, and the clamping body 1 may be plate-shaped to accommodate most square cells nowadays. However, it is not limited thereto, and the shape of the clamping body 1 may be adaptively adjusted according to the shape of the cell 3 to be tested.

[0052] It should be noted that the above-mentioned connecting portion 12 is not limited to the above-mentioned plug-in form. As long as the detachable connection of two adjacent clamping portions can be achieved, the above-mentioned connecting portion 12 can also be in other forms. For example, not shown in the figure, the above-mentioned connecting portion can be a slot and an insertion strip arranged at both ends of the clamping portion in the second direction. The slot and the insertion strip can both extend along the third direction. Both the slot and the insertion strip can be slidably connected along the third direction to achieve mutual clamping of the two adjacent clamping portions in the second direction.

[0053] Based on the features described above, the battery cell test fixture provided by the above technical features can be applied to a variety of detection tests. The battery cell test fixture provided by the present invention is applied to the battery cell puncture test (see Figure 2 ) and applied to the thermal expansion test of battery cells (see Figure 3 ) as an example to provide a detailed description.

[0054] For the battery cell puncture test:

[0055] Preferably, if Figure 2 As shown, the battery cell test fixture includes two clamping bodies 1, and at least one of the intermediate clamping parts 112 included in the two clamping bodies 1 can be provided with a puncture hole 41 penetrating the clamping part along the first direction F1 for inserting the test needle into the fixture. In this way, the puncture hole 41 is provided on the intermediate clamping part 112, which can facilitate the replacement of the intermediate clamping part 112 with the puncture hole 41. On the one hand, it enables the fixture to switch to other states for application in other tests; on the other hand, it is convenient to replace the intermediate clamping part 112 with different sizes of puncture holes 41 to adapt to different needles.

[0056] Preferably, the space of the puncture hole 41 can be 15-5 mm to accommodate most needle sizes.

[0057] Preferably, if Figure 2 As shown, avoidance holes 42 may be provided on both of the connecting parts 12 that cooperate with the middle clamping parts 112 having the puncture hole 41. When the multiple clamping parts are in an assembled state, the avoidance holes 42 can completely expose the puncture hole 41 to prevent the connecting part 12 from interfering with the puncture needle passing through the puncture hole 41.

[0058] It should be noted that Figure 2 An example is shown in which the middle clamping portion 112 is provided with one puncture hole 41 , but it is not limited thereto, and the number and the arrangement positions of the puncture holes 41 can be adaptively adjusted according to test requirements.

[0059] For the battery cell thermal expansion test:

[0060] Preferably, if Figure 3 As shown, the battery cell test fixture includes three clamping bodies 1 and expansion force sensors 5. The three clamping bodies 1 form two clamping gaps, and the locking bolts 21 sequentially penetrate the three clamping bodies 1 along the first direction F1. The expansion force sensor 5 is arranged in one of the two clamping gaps, and the other of the two clamping gaps is used to clamp the battery cell 3 to be tested. In this way, the three clamping bodies 1 are sequentially sleeved on the locking bolts 21, and the nuts 22 can fix the distance between the two clamping bodies 1 located on both sides of the three clamping bodies 1. When the battery cell 3 to be tested undergoes thermal expansion, the battery cell 3 to be tested can push the clamping body 1 located in the middle of the three clamping bodies 1 to move, so as to apply pressure to the expansion force sensor 5, thereby realizing the data collection of the thermal expansion degree of the battery cell 3 to be tested by the expansion force sensor 5.

[0061] The embodiment of the second aspect of the present application further provides a battery testing device, including the battery cell testing fixture described in any of the above embodiments, and thus has all the beneficial technical effects of the battery cell testing fixture, which will not be repeated here.

[0062] Optionally, the battery testing device may further include a battery detection device.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell testing fixture, characterized in that: It comprises a locking portion and at least two clamping bodies, wherein the at least two clamping bodies are arranged opposite to each other in sequence along a first direction, two adjacent clamping bodies are connected via the locking portion, and the locking portion can adjust the distance between the two adjacent clamping bodies in the first direction; The clamping body includes a plurality of clamping parts, and the plurality of clamping parts can be detachably connected in sequence along a second direction, and the second direction intersects with the first direction.

2. The battery cell testing fixture according to claim 1, characterized in that: When the plurality of clamping parts are assembled into the clamping body, the two clamping parts located at the two ends of the clamping body in the second direction are defined as end clamping parts, and the remaining clamping parts located between the two end clamping parts are defined as middle clamping parts; The locking portion is arranged on the end clamping portion.

3. The battery cell testing fixture according to claim 2, characterized in that: The clamping body further comprises a connecting portion, and two adjacent clamping portions on the same clamping body are detachably connected via the connecting portion.

4. The battery cell testing fixture according to claim 3, characterized in that: One end of the end clamping portion facing the middle clamping portion and both ends of the middle clamping portion in the second direction are provided with insertion holes, and the insertion holes extend toward the inside of the clamping portion along the second direction; The connecting portion can be plugged into the plugging holes of two adjacent clamping portions respectively.

5. The battery cell testing fixture according to claim 4, characterized in that: A depth of the inserting hole in the second direction is greater than or equal to half of a dimension of the connecting portion in the second direction.

6. The battery cell testing fixture according to any one of claims 3 to 5, characterized in that: The battery cell testing fixture comprises two clamping bodies, and at least one of the intermediate clamping parts comprised by the two clamping bodies is provided with a puncture hole penetrating through the clamping part along the first direction.

7. The battery cell testing fixture according to claim 6, characterized in that: The two connecting parts that cooperate with the middle clamping part having the puncture hole are provided with avoidance holes. When the plurality of clamping parts are in an assembled state, the avoidance holes can expose the puncture hole.

8. The battery cell testing fixture according to any one of claims 2 to 5, characterized in that: The battery cell testing fixture comprises three clamping bodies and an expansion force sensor, the three clamping bodies form two clamping gaps, and the locking portion sequentially penetrates the three clamping bodies along a first direction; The expansion force sensor is arranged in one of the two clamping gaps, and the other of the two clamping gaps is used to clamp the battery cell to be tested.

9. The battery cell testing fixture according to claim 2, characterized in that: The end clamping portion is provided with a connecting through hole penetrating the end clamping portion along the first direction; The locking portion includes a locking bolt extending along the first direction and a nut matched with the locking bolt, and the locking bolt can pass through the connecting through hole.

10. A battery testing device, characterized in that: A battery cell testing fixture comprising any one of claims 1 to 9.

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