Battery test fixture

Abstract

The utility model relates to a battery test fixture which is used for improving the clamping safety of a battery test. The battery test fixture comprises a first clamping plate and a second clamping plate which are detachably connected through a connecting structure; a mounting space for clamping a battery to be tested is formed between the first clamping plate and the second clamping plate; and the temperature detection structure is mounted in a mounting groove formed in the first clamping plate and facing the battery to be detected, and the temperature detection structure is in close contact with the surface of the battery to be detected.

Description

Technical Field

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

[0002] During the battery charge and discharge test, the battery needs to be clamped with a fixture, and during the test, the battery temperature and battery expansion need to be detected.

[0003] When a conventional clamp clamps the battery, the temperature sensor placed on the battery surface may be damaged due to excessive clamping force, as described in CN207601275U; when the battery is a soft-pack battery, the battery casing may be dented due to the tightly pressed temperature sensor, thereby affecting the state of the internal electrode of the battery and causing safety risks during battery charge and discharge testing. Summary of the invention

[0004] The present application relates to a battery testing fixture, which is used to improve the clamping safety of battery testing.

[0005] The technical solution of this application is:

[0006] The present application provides a battery testing fixture, comprising:

[0007] The battery to be tested;

[0008] A first clamping plate and a second clamping plate detachably connected by a connecting structure; an installation space for clamping the battery to be tested is formed between the first clamping plate and the second clamping plate;

[0009] The temperature detection structure is installed in the installation groove opened by the first clamping plate facing the battery to be tested, and the temperature detection structure is in close contact with the surface of the battery to be tested.

[0010] Preferably, the battery testing fixture further comprises: a pressure detection structure, which is arranged in contact with the other side surface of the second clamping plate away from the first clamping plate.

[0011] Preferably, the battery testing fixture further comprises:

[0012] a third clamping plate, wherein the second clamping plate is disposed between the first clamping plate and the third clamping plate;

[0013] The first clamping plate, the second clamping plate and the third clamping plate are connected by the connecting structure;

[0014] The pressure detection structure is clamped between the second clamping plate and the third clamping plate.

[0015] Preferably, the battery testing fixture further comprises:

[0016] An elastic element has one end connected to the groove wall of the installation groove and the other end connected to the temperature detection structure.

[0017] Preferably, the first clamping plate is also provided with a harness through hole through which the connecting harness of the temperature detection structure passes.

[0018] Preferably, the collected data of the temperature detection structure and the pressure detection structure are displayed by the same digital display or are displayed by two digital displays respectively.

[0019] Preferably, there are multiple temperature detection structures, and the number of mounting grooves opened on the first clamping plate facing the battery to be tested is the same as the number of the temperature detection structures.

[0020] Preferably, the elastic element is connected to the groove wall of the installation groove and the temperature detection structure through double-sided tape.

[0021] Preferably, the temperature detection structure is a thermistor, and the pressure detection structure is a pressure sensor.

[0022] Preferably, the battery to be tested is a lithium battery, a sulfur battery or a sodium battery.

[0023] The beneficial effects of the utility model are:

[0024] 1) Since a mounting groove is provided on the surface of the first clamping plate facing the battery to be tested, when the preload force applied to the battery to be tested is adjusted, the main part of the temperature detection structure is always arranged in the mounting groove, and the preload force will not be transmitted to the temperature detection structure, so it can be ensured that the temperature detection structure will not be damaged;

[0025] 2) Since the temperature detection structure will not be affected by the change of preload force, the contact force between the temperature detection structure and the contact position of the battery to be tested will not increase, so the safety of the battery to be tested itself can be guaranteed;

[0026] 3) By adjusting the connection structure to adjust the preload force applied to the battery to be tested, the battery to be tested can be clamped and prevented from over-expanding during the charge and discharge process;

[0027] 4) A pressure detection structure attached to the surface of the second clamping plate facing away from the first clamping plate can detect the actual preload force applied to the battery to be tested to verify whether the actual preload force applied to the battery to be tested is consistent with the expected preload force applied to the battery to be tested; in addition, the pressure detection structure can also detect the expansion force of the battery to be tested when it expands. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of a battery testing fixture in an embodiment of the present application;

[0029] Figure 2 It is a schematic diagram of the assembly of the first clamping plate, the temperature detection structure and the digital display of the embodiment of the present application;

[0030] Description of reference numerals:

[0031] 1-Battery to be tested;

[0032] 2-first clamping plate; 21-installation slot; 22-wiring harness through hole;

[0033] 3- Second splint;

[0034] 4-bolts;

[0035] 5-temperature detection structure; 51-connecting harness;

[0036] 6-pressure detection structure;

[0037] 7- third splint;

[0038] 81-temperature digital display; 82-pressure digital display;

[0039] 9- Elastic element. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0041] Reference Figure 1 and Figure 2 , an embodiment of the present application provides a battery testing fixture, comprising:

[0042] A first clamping plate 2 and a second clamping plate 3 detachably connected by a connecting structure; an installation space for clamping the battery 1 to be tested is formed between the first clamping plate 2 and the second clamping plate 3, that is, the battery 1 to be tested is clamped between the first clamping plate 2 and the second clamping plate 3;

[0043] The temperature detection structure 5 is installed in the installation groove 21 opened on the first clamping plate 2 facing the battery 1 to be tested, and the temperature detection structure 5 is in close contact with the surface of the battery 1 to be tested.

[0044] Since a mounting groove 21 is provided on the surface of the first clamping plate 2 facing the battery 1 to be tested, when the preload force applied to the battery 1 to be tested is adjusted, the main part of the temperature detection structure 5 is always arranged in the mounting groove 21, and the preload force will not be transmitted to the temperature detection structure 5, so it can be ensured that the temperature detection structure 5 will not be damaged.

[0045] Since the temperature detection structure 5 will not be affected by the change of the preload force, the contact force between the temperature detection structure 5 and the battery to be tested 1 will not increase, so the safety of the battery to be tested 1 itself can be guaranteed.

[0046] By adjusting the connection structure to adjust the pre-tightening force applied to the battery 1 to be tested, the battery 1 to be tested can be clamped and prevented from over-expanding during the charge and discharge process.

[0047] Reference Figure 1 and Figure 2 The battery test fixture in the embodiment of the present application further includes: a pressure detection structure 6 , which is arranged on the other side surface of the second clamping plate 3 away from the first clamping plate 2 .

[0048] The pressure detection structure 6 attached to the surface of the second clamping plate 3 facing away from the first clamping plate 2 can detect the actual preload force applied to the battery 1 to be tested, so as to verify whether the actual preload force applied to the battery 1 to be tested is consistent with the expected preload force applied to the battery 1 to be tested; in addition, the pressure detection structure 6 can also detect the expansion force when the battery 1 to be tested expands.

[0049] In the embodiment of the present application, the connection structure is a bolt 4 and a nut. After one end of the bolt 4 passes through the bolt holes on the second clamping plate 3 and the first clamping plate 2, the bolt 4 and the nut are locked on one side of the first clamping plate 2 to realize the connection between the first clamping plate 2 and the second clamping plate 3. The nut is close to the first clamping plate 2, and the nut is tightened by a torque wrench, so that the first clamping plate 2 presses down the battery 1 to be tested, thereby applying a pre-tightening force to the battery 1 to be tested. In actual adjustment, the pre-tightening force N required for the lithium battery and the tightening torque T applied to the nut by the torque wrench are converted using a general formula: T = (k*N*φ) / n, where: T-torque Nm, n-number of bolts 4, k-0.15~0.2, N-pre-tightening force (N), φ-nominal diameter of bolt 4 (mm), for example: N=3kN, φ=8mm, n=4, k is 0.2, and T=1.2Nm is obtained. In the process of adjusting the preload force, the pressure data collected by the pressure detection structure 6 displayed on the digital display can be used to verify whether the tightening torque applied by the torque wrench is reasonable, thereby adjusting the tightening torque, and finally making the actual preload force applied to the battery 1 to be tested the desired preload force.

[0050] In the embodiment of the present application, the battery 1 to be tested may be a lithium battery, a sulfur battery, or a sodium battery.

[0051] In the embodiment of the present application, the collected data of the temperature detection structure 5 and the pressure detection structure 6 are displayed by the same digital display. In this case, the digital display is required to integrate two parameter reading functions.

[0052] In the embodiment of the present application, the collected data of the temperature detection structure 5 and the pressure detection structure 6 can also be displayed through a digital display respectively, and the collected data of the temperature detection structure 5 is displayed through the temperature digital display 81, and the collected data of the pressure detection structure 6 is displayed through the pressure digital display 82.

[0053] In the embodiment of the present application, the temperature detection structure 5 is a thermistor, and the pressure detection structure 6 is a pressure sensor.

[0054] Reference Figure 1 In the embodiment of the present application, the battery test fixture further includes:

[0055] The elastic element 9 has one end connected to the groove wall of the installation groove 21 , and the other end connected to the temperature detection structure 5 .

[0056] The elastic element 9 is a spring, and the elastic element 9 is connected to the groove wall of the installation groove 21 and the temperature detection structure 5 by double-sided adhesive tape; of course, the elastic element 9 can also be connected to the groove wall of the installation groove 21 and the temperature detection structure 5 by other connection methods, such as welding. The double-sided adhesive connection method can facilitate the replacement of the elastic element 9 when the elastic element 9 fails.

[0057] When the torque wrench applies a pre-tightening force to the battery 1 to be tested, the elastic element 9 will shrink into the mounting groove 21 , so that the temperature detection structure 5 is closely fitted to the large surface of the battery 1 to be tested.

[0058] Reference Figure 1 In the embodiment of the present application, the battery test fixture further includes:

[0059] The third clamping plate 7, the second clamping plate 3 is arranged between the first clamping plate 2 and the third clamping plate 7;

[0060] The first clamping plate 2, the second clamping plate 3 and the third clamping plate 7 are connected by a connecting structure;

[0061] The pressure detection structure 6 is clamped between the second clamping plate 3 and the third clamping plate 7 .

[0062] As described above, the connection structure in the embodiment of the present application is a nut and a bolt 4. When there is a third clamping plate 7, one end of the bolt 4 passes through the bolt holes on the third clamping plate 7, the second clamping plate 3 and the first clamping plate 2 from the side of the third clamping plate 7 away from the second clamping plate 3 in sequence and then connects with the nut. The connection structure can be set in multiple groups.

[0063] Reference Figure 2 In the embodiment of the present application, the first clamping plate 2 is also provided with a harness through hole 22 through which the connecting harness 51 of the temperature detection structure 5 passes. After the connecting harness 51 passes through the harness through hole 22, it is connected to the temperature digital display 81.

[0064] In order to improve the temperature detection result of the battery 1 to be tested, in the embodiment of the present application, there are multiple temperature detection structures 5, and the number of installation grooves 21 opened on the first clamping plate 2 facing the battery 1 to be tested is the same as the number of temperature detection structures 5; at this time, the number of wiring harness vias 22 can also be set to be consistent with the number of temperature detection structures 5, and the lengths of different wiring harness vias 22 vary according to the corresponding installation position of the temperature detection structure 5.

[0065] In a specific example of the present application, the first clamping plate 2, the second clamping plate 3 and the third clamping plate 7 have a thickness ≥ 2 cm, a length ≥ 10 cm, and a width ≥ 5 cm, for example: the length is 300 mm, the width is 200 mm, and the thickness is 30 mm; the size of the battery 1 to be tested is 220*44*100 mm, and the radius of the wiring harness via 22 is 2~5 mm; the temperature detection structure 5 is 5 mm long and 2.5 mm wide, the diameter of the elastic element 9 is 2.5 mm, and the height of the elastic element 9 can be reduced by 50%.

[0066] Since the temperature detection structure 5 is connected to the groove wall of the installation groove 21 through the elastic element 9, when the first clamping plate 2 applies pressure to the battery 1 to be tested, the elastic element 9 is tightened, and the temperature detection structure 5 is closely fitted to the surface of the battery 1 to be tested, which can prevent the temperature detection structure 5 from being squeezed by the pre-tightening force. The wiring harness through hole 22 set on the first clamping plate 2 can prevent the connection harness 51 of the temperature detection structure 5 from affecting the uniformity of the force on the battery 1 to be tested.

[0067] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0068] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0069] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements does not include those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0070] The technical solution provided by the utility model is described in detail above. The principle and implementation method of the utility model are described in this article using specific examples. The description of the above embodiments is only used to help understand the utility model, and the content of this specification should not be understood as limiting the utility model. At the same time, for those skilled in the art, according to the utility model, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived from them are still within the protection scope of the utility model.

Claims

1. A battery testing fixture, characterized in that: include: A first clamping plate (2) and a second clamping plate (3) detachably connected via a connecting structure; an installation space for clamping the battery (1) to be tested is formed between the first clamping plate (2) and the second clamping plate (3); A temperature detection structure (5) is installed in a mounting groove (21) provided on the first clamping plate (2) facing the battery to be tested (1), and the temperature detection structure (5) is in close contact with the surface of the battery to be tested (1).

2. The battery test fixture according to claim 1, characterized in that: The battery test fixture also includes: A pressure detection structure (6) is arranged in contact with the other side surface of the second clamping plate (3) facing away from the first clamping plate (2).

3. The battery test fixture according to claim 2, characterized in that: The battery test fixture also includes: a third clamping plate (7), wherein the second clamping plate (3) is arranged between the first clamping plate (2) and the third clamping plate (7); The first clamping plate (2), the second clamping plate (3) and the third clamping plate (7) are connected via the connecting structure; The pressure detection structure (6) is clamped between the second clamping plate (3) and the third clamping plate (7).

4. The battery test fixture according to claim 1, characterized in that: The battery test fixture also includes: An elastic element (9) has one end connected to the groove wall of the installation groove (21) and the other end connected to the temperature detection structure (5).

5. The battery test fixture according to claim 1, characterized in that: The first clamping plate (2) is also provided with a harness through hole (22) through which the connecting harness of the temperature detection structure (5) passes.

6. The battery test fixture according to claim 2, characterized in that: The collected data of the temperature detection structure (5) and the pressure detection structure (6) are displayed through the same digital display or are displayed through separate digital displays.

7. The battery test fixture according to claim 1, characterized in that: There are a plurality of temperature detection structures (5), and the number of mounting grooves (21) provided on the first clamping plate (2) facing the battery to be tested (1) is the same as the number of the temperature detection structures (5).

8. The battery test fixture according to claim 4, characterized in that: The elastic element (9) is connected to the groove wall of the installation groove (21) and the temperature detection structure (5) via double-sided adhesive.

9. The battery test fixture according to claim 2, characterized in that: The temperature detection structure (5) is a thermistor, and the pressure detection structure (6) is a pressure sensor.

10. The battery test fixture according to claim 1, characterized in that: The battery to be tested (1) is a lithium battery, a sulfur battery or a sodium battery.

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