Battery cell test fixture

Abstract

The utility model relates to the field of batteries, and provides a battery cell test fixture, which comprises a first pressing assembly, a second pressing assembly, a driving assembly and a temperature detection device, wherein the first pressing assembly and the second pressing assembly are oppositely arranged and are arranged on the two sides of a to-be-detected battery cell respectively, the driving assembly is used for driving the first pressing assembly and the second pressing assembly to be close to each other, and at least one of the first pressing assembly and the second pressing assembly is provided with a mounting hole for mounting a temperature detection device. The temperature detection device is arranged in the mounting hole but not between the first pressing assembly or the second pressing assembly and the battery cell, so that the problem that the battery cell is stressed unevenly due to the fact that the temperature detection device is flatly laid on the surface of the battery cell is solved, namely, the temperature detection device does not influence the contact area between the first pressing assembly or the second pressing assembly and the battery cell; the surface stress of the battery cell is uniform, so that the actual stress condition can be accurately simulated, and the test accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core testing fixture. Background Art

[0002] As one of the most widely used energy storage systems, lithium-ion batteries are playing an increasingly important role. Improving the safety and cycle performance of lithium-ion batteries will help reduce the use and manufacturing costs of lithium-ion batteries and further promote the development and application of lithium-ion batteries.

[0003] In the related art, a cell test fixture is required in the process of testing the cells of lithium batteries. The cell test fixture includes a pair of pressing plates and a thermocouple wire. The cell is arranged between the pair of pressing plates. The pair of pressing plates is used to clamp the cell to simulate the actual working condition of the cell. The thermocouple wire is arranged between the cell and the pressing plate to detect the temperature of the cell.

[0004] The inventors found in practice that the thermocouple wire is set between the battery cell and the pressure plate and has a small contact area with the battery cell, which causes uneven pressure on the surface of the battery cell, which is inconsistent with the actual pressure condition of the battery cell and affects the accuracy of the test. Utility Model Content

[0005] The utility model provides a battery cell testing fixture, which is used to solve the defect in the related art that the pressure provided by the battery cell testing fixture is inconsistent with the actual pressure condition of the battery cell, thus affecting the accuracy of the test.

[0006] On the one hand, the utility model provides a battery cell testing fixture, comprising a first clamping assembly, a second clamping assembly, a driving assembly and a temperature detection device;

[0007] Among them, the first clamping assembly and the second clamping assembly are arranged opposite to each other, and the two are respectively arranged on both sides of the battery cell to be tested, the driving assembly is used to drive the first clamping assembly and the second clamping assembly to approach each other, and at least one of the first clamping assembly and the second clamping assembly is provided with a mounting hole for installing the temperature detection device.

[0008] According to a battery cell testing fixture provided by the utility model, the driving assembly includes at least two groups of threaded parts, each group of the threaded parts connects the first clamping assembly and the second clamping assembly, and the threaded parts are used to drive the first clamping assembly and the second clamping assembly to approach each other.

[0009] According to a battery cell testing fixture provided by the utility model, it also includes an elastic member, which is respectively connected to the first clamping assembly and the second clamping assembly, and is used to drive the first clamping assembly and the second clamping assembly to move away from each other.

[0010] According to the battery cell testing fixture provided by the utility model, the elastic member is sleeved on the outer side of the threaded member.

[0011] According to a battery cell testing fixture provided by the utility model, the driving assembly includes an air cylinder or an oil cylinder, and the air cylinder or the oil cylinder drives the first clamping assembly and the second clamping assembly to approach each other.

[0012] According to a battery cell testing fixture provided by the utility model, at least one of the first clamping assembly and the second clamping assembly includes a pressing plate, a connecting plate and a connecting column;

[0013] Among them, the pressure plate is used to abut against the battery cell, the pressure plate is provided with the mounting hole, the connecting plate is arranged on the side of the pressure plate away from the battery cell, the connecting plate is connected to the pressure plate through the connecting column, and the connecting plate is connected to the driving assembly.

[0014] According to a battery cell testing fixture provided by the utility model, the connecting plate is provided with a through hole, the through hole faces the pressing plate and can allow the cable of the temperature detection device to pass through.

[0015] According to a battery cell testing fixture provided by the utility model, at least one of the first clamping assembly and the second clamping assembly further includes a sleeve, and the sleeve is connected to one end of the through hole close to the pressing plate.

[0016] According to a battery cell testing fixture provided by the utility model, the axis of the mounting hole intersects with the pressing surface of the first pressing assembly or the pressing surface of the second pressing assembly;

[0017] Alternatively, the axis of the mounting hole is parallel to the pressing surface of the first pressing assembly or the pressing surface of the second pressing assembly.

[0018] According to a battery cell testing fixture provided by the utility model, at least one of the pressing surface of the first pressing assembly and the pressing surface of the second pressing assembly is provided with a positioning structure for positioning the battery cell.

[0019] The battery cell testing fixture provided by the utility model can be arranged on both sides of the battery cell to be tested by means of a first clamping assembly and a second clamping assembly that are relatively arranged. The battery cell can be squeezed by driving the first clamping assembly and the second clamping assembly to approach each other through a driving assembly. The temperature detection device is arranged in the mounting hole of the first clamping assembly or the second clamping assembly, so as to detect the temperature of the battery cell.

[0020] The temperature detection device is arranged in the mounting hole instead of between the first clamping assembly or the second clamping assembly and the battery cell, so as to avoid the problem of uneven force on the battery cell caused by the temperature detection device being laid flat on the surface of the battery cell. That is, the temperature detection device will not affect the contact area between the first clamping assembly or the second clamping assembly and the battery cell, so that the surface of the battery cell is evenly stressed, thereby accurately simulating the actual pressure conditions and improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a structural schematic diagram of a battery cell testing fixture provided by an embodiment of the utility model;

[0023] Figure 2 yes Figure 1 a top view of the view shown;

[0024] Figure 3 It is a schematic diagram of the cooperation between the battery cell and the positioning structure provided in an embodiment of the utility model.

[0025] Reference numerals:

[0026] 1. Battery cell; 2. Temperature detection device; 3. Threaded part; 4. Elastic part; 5. Pressing plate; 6. Connecting plate; 7. Connecting column; 8. Sleeve; 9. Positioning structure; 10. Through hole; 11. Mounting hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Combine the following Figure 1-Figure 3 A battery cell testing fixture provided in an embodiment of the utility model is described.

[0029] Specifically, the battery cell testing fixture includes a first clamping assembly, a second clamping assembly, a driving assembly and a temperature detection device 2 .

[0030] The first clamping assembly and the second clamping assembly are arranged opposite to each other, and the two are arranged on both sides of the battery cell 1 to be tested. The driving assembly is used to drive the first clamping assembly and the second clamping assembly to approach each other. At least one of the first clamping assembly and the second clamping assembly is provided with a mounting hole 11 for mounting the temperature detection device 2. Optionally, the temperature detection device 2 is set as a thermocouple wire.

[0031] The battery cell testing fixture provided in the embodiment of the utility model can be arranged on both sides of the battery cell 1 to be tested by means of the relatively arranged first clamping assembly and the second clamping assembly. The battery cell 1 can be squeezed by driving the first clamping assembly and the second clamping assembly to approach each other through the driving assembly. The temperature detection device 2 is arranged in the mounting hole 11 of the first clamping assembly or the second clamping assembly, so as to detect the temperature of the battery cell 1.

[0032] The temperature detection device 2 is arranged in the mounting hole 11 instead of between the first clamping assembly or the second clamping assembly and the battery cell 1, so as to avoid the problem of uneven force on the battery cell 1 caused by the temperature detection device 2 being laid flat on the surface of the battery cell 1, that is, the temperature detection device 2 will not affect the contact area between the first clamping assembly or the second clamping assembly and the battery cell 1, so that the surface of the battery cell 1 is evenly stressed, thereby being able to accurately simulate the actual pressure conditions and improve the test accuracy.

[0033] In some embodiments provided by the present invention, the driving assembly includes at least two groups of threaded members 3, each group of threaded members 3 connects the first clamping assembly and the second clamping assembly, and the threaded members 3 are used to drive the first clamping assembly and the second clamping assembly to approach each other.

[0034] In this embodiment, the first clamping assembly and the second clamping assembly are connected by the screw member 3, and the first clamping assembly and the second clamping assembly are driven to approach each other. On the one hand, the screw member 3 has an anti-loosening effect and can provide long-term and stable pressure for the battery cell 1. On the other hand, the screw member 3 is usually a metal component and has a good high temperature resistance effect. Even when the temperature of the battery cell 1 is high, it can provide stable pressure for the battery cell 1.

[0035] In some embodiments provided by the present utility model, the threaded member 3 includes a screw and a nut. Optionally, the first end of the screw passes through the first clamping assembly and is threadedly connected to a set of nuts, and the second end of the screw passes through the second clamping assembly and is threadedly connected to another set of nuts, and the first clamping assembly and the second clamping assembly can be driven to clamp the battery cell 1 by screwing any set of nuts.

[0036] Alternatively, the screw rod is not limited to passing through the first clamping assembly and the second clamping assembly respectively and being connected to the corresponding nuts. For example, in other embodiments, the first end of the screw rod is fixedly connected to one of the first clamping assembly and the second clamping assembly, and the second end of the screw rod passes through the other of the first clamping assembly and the second clamping assembly and is threadedly connected to the nut.

[0037] Of course, the threaded member 3 is not limited to the above-mentioned form of the screw and nut. For example, in other embodiments provided by the present invention, the threaded member 3 includes a screw, which is rotatably connected to one of the first clamping assembly and the second clamping assembly, and the screw is threadedly connected to the other of the first clamping assembly and the second clamping assembly. The first clamping assembly and the second clamping assembly can be driven closer to each other by screwing the screw.

[0038] Alternatively, the screw rod is provided with thread segments with opposite thread rotation directions at both ends, and the two thread segments are respectively threadedly connected to the first clamping assembly and the second clamping assembly, so that the first clamping assembly and the second clamping assembly can be driven closer to each other by rotating the screw rod.

[0039] In some embodiments provided by the present invention, the battery cell testing fixture further includes an elastic member 4, which is respectively connected to the first clamping assembly and the second clamping assembly and is used to drive the first clamping assembly and the second clamping assembly to move away from each other.

[0040] In this embodiment, by setting an elastic member 4 between the first clamping assembly and the second clamping assembly, for the threaded member 3 set in the form of a screw and a nut as described above, after loosening the nut, the first clamping assembly and the second clamping assembly move away from each other under the action of the elastic member 4, so as to facilitate the removal of the battery cell 1 between the first clamping assembly and the second clamping assembly. Of course, for the threaded member 3 set in the form of a screw as described above, the elastic member 4 can also be set, so that when the battery cell 1 is loosened, the elastic member 4 can offset part of the gravity of the first clamping assembly or the second clamping assembly, so that the force required to screw the screw is smaller and the operation is more labor-saving.

[0041] In some embodiments provided by the present invention, the elastic member 4 is sleeved on the outside of the threaded member 3. For example, the elastic member 4 is set as a spring, and the elastic member 4 is sleeved on the screw of the threaded member 3. In this embodiment, by sleeved the elastic member 4 on the outside of the threaded member 3, the internal space of the elastic member 4 can be fully utilized, so that the elastic member 4 and the threaded member 3 are partially overlapped, thereby achieving the effect of reducing the volume of the battery cell test fixture.

[0042] Of course, the driving assembly is not limited to being set as the screw member 3. For example, in other embodiments provided by the utility model, the driving assembly includes a cylinder or an oil cylinder. The cylinder or the oil cylinder drives the first clamping assembly and the second clamping assembly to approach. For example, the two ends of the cylinder or the oil cylinder are respectively connected to the first clamping assembly and the second clamping assembly, so that the first clamping assembly and the second clamping assembly are pulled close by the cylinder or the oil cylinder. Alternatively, a cylinder or an oil cylinder is provided on one side of at least one of the first clamping assembly and the second clamping assembly, so that the first clamping assembly and the second clamping assembly are driven close by the cylinder or the oil cylinder.

[0043] refer to Figure 1 As shown, in some embodiments provided by the present invention, at least one of the first clamping assembly and the second clamping assembly includes a pressing plate 5 , a connecting plate 6 and a connecting column 7 .

[0044] Among them, the pressing plate 5 is used to abut against the battery cell 1, and the pressing plate 5 is provided with the mounting hole 11. The connecting plate 6 is arranged on the side of the pressing plate 5 away from the battery cell 1, and the connecting plate 6 is connected to the pressing plate 5 through the connecting column 7. For example, the connecting column 7 is welded or plugged with the connecting column 7 and the pressing plate 5 respectively. The connecting plate 6 is connected to the driving component. In this embodiment, the driving component drives the connecting plate 6, and the connecting plate 6 drives the pressing plate 5 to press the battery cell 1 through the connecting column 7, and the thermocouple wire can be arranged between the connecting plate 6 and the pressing plate 5 to reduce the problem of messy cables.

[0045] refer to Figure 1 and Figure 2 As shown, in some embodiments provided by the present invention, the connecting plate 6 is provided with a through hole 10, which faces the pressing plate 5 and can be used for the cable of the temperature detection device 2 to pass through. In this way, the thermocouple wire can be led out from the through hole 10 of the connecting plate 6, thereby guiding and restraining the thermocouple wire and reducing the problem of cable clutter.

[0046] refer to Figure 1 As shown, in some embodiments provided by the utility model, at least one of the first clamping assembly and the second clamping assembly also includes a sleeve 8, and the sleeve 8 is connected to one end of the through hole 10 close to the pressure plate 5. In this way, the sleeve 8 can start guiding and restraining the thermocouple wire, reducing the problem of cable clutter.

[0047] Optionally, the sleeve 8 is threadedly connected to the through hole 10 .

[0048] refer to Figure 1 and Figure 3 As shown, in some embodiments provided by the present invention, the axis of the mounting hole 11 intersects with the pressing surface of the first pressing assembly or the pressing surface of the second pressing assembly.

[0049] So set up, refer to Figure 3As shown, it is convenient to set the mounting holes 11 in a targeted manner according to different test positions of the battery cell 1 and arrange the temperature detection device 2 so as to detect the temperature of the battery cell 1 at different test temperatures.

[0050] Furthermore, the mounting hole 11 passes through the pressing plate 5 of the pressing assembly, and the axis of the mounting hole 11 is perpendicular to the pressing surface of the pressing plate 5. This arrangement enables the temperature detection device 2 to directly contact the battery cell 1, thereby accurately obtaining the temperature of the battery cell 1. By making the axis of the mounting hole 11 perpendicular to the pressing surface, it is easier to process the mounting hole 11.

[0051] Of course, the axis of the mounting hole 11 is not limited to intersecting with the clamping surface of the first clamping assembly or the clamping surface of the second clamping assembly. For example, in other embodiments provided by the present invention, the axis of the mounting hole 11 is parallel to the clamping surface of the first clamping assembly or the clamping surface of the second clamping assembly. For example, the mounting hole 11 is arranged on the side wall of the pressure plate 5. Furthermore, the spacing between the axis of the mounting hole 11 and the clamping surface of the pressure plate 5 can be smaller than the radius of the mounting hole 11, so that the inner surface of the mounting hole 11 penetrates the clamping surface of the pressure plate 5, so that the temperature detection device 2 can be in direct contact with the battery cell 1, thereby accurately obtaining the temperature of the battery cell 1.

[0052] like Figure 3 As shown, in some embodiments provided by the present invention, at least one of the pressing surface of the first pressing assembly and the pressing surface of the second pressing assembly is provided with a positioning structure 9 for positioning the battery cell 1 .

[0053] In this embodiment, the battery cell 1 is positioned by providing a positioning structure 9 so that during each measurement process, the relative position between the temperature detection device 2 in the mounting hole 11 and the battery cell 1 is uniquely determined, thereby ensuring consistency in detection of the battery cell 1 .

[0054] Optionally, the positioning structure 9 includes a protruding structure protruding from the pressing surface, and the protruding structure is arranged in two groups, and the extension directions of the two groups of protruding structures intersect, for example, the extension directions of the two groups of protruding structures are perpendicular. When placing the battery cell 1, the side walls of the battery cell 1 are respectively abutted against the two groups of protruding structures, so that the battery cell 1 is in the correct position.

[0055] Of course, the positioning structure 9 is not limited to the protruding structure. For example, in other embodiments provided by the present invention, the positioning structure 9 includes engraved lines, for example, the engraved lines are arranged in two groups, and the two groups of engraved lines intersect, for example, the two groups of engraved lines are perpendicular. When placing the battery cell 1, the side walls of the battery cell 1 are aligned with the two groups of engraved lines respectively, so that the battery cell 1 is in the correct position.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A battery cell testing fixture, characterized in that: It includes a first pressing assembly, a second pressing assembly, a driving assembly and a temperature detection device; Among them, the first clamping assembly and the second clamping assembly are arranged opposite to each other, and the two are respectively arranged on both sides of the battery cell to be tested, the driving assembly is used to drive the first clamping assembly and the second clamping assembly to approach each other, and at least one of the first clamping assembly and the second clamping assembly is provided with a mounting hole for installing the temperature detection device.

2. The battery cell testing fixture according to claim 1, characterized in that: The driving assembly includes at least two groups of threaded members, each group of the threaded members connects the first clamping assembly and the second clamping assembly, and the threaded members are used to drive the first clamping assembly and the second clamping assembly to approach each other.

3. The battery cell testing fixture according to claim 2, characterized in that: It also includes an elastic member, which is respectively connected to the first clamping assembly and the second clamping assembly and is used to drive the first clamping assembly and the second clamping assembly to move away from each other.

4. The battery cell testing fixture according to claim 3, characterized in that: The elastic member is sleeved on the outer side of the threaded member.

5. The battery cell testing fixture according to claim 1, characterized in that: The driving assembly includes an air cylinder or an oil cylinder, and the air cylinder or the oil cylinder drives the first clamping assembly and the second clamping assembly to approach each other.

6. The battery cell testing fixture according to any one of claims 1 to 5, characterized in that: At least one of the first clamping assembly and the second clamping assembly includes a clamping plate, a connecting plate and a connecting column; Among them, the pressure plate is used to abut against the battery cell, the pressure plate is provided with the mounting hole, the connecting plate is arranged on the side of the pressure plate away from the battery cell, the connecting plate is connected to the pressure plate through the connecting column, and the connecting plate is connected to the driving assembly.

7. The battery cell testing fixture according to claim 6, characterized in that: The connecting plate is provided with a through hole, the through hole faces the pressing plate and can allow the cable of the temperature detection device to pass through.

8. The battery cell testing fixture according to claim 7, characterized in that: At least one of the first clamping assembly and the second clamping assembly further includes a sleeve, and the sleeve is connected to one end of the through hole close to the pressing plate.

9. The battery cell testing fixture according to any one of claims 1 to 5, characterized in that: The axis of the mounting hole intersects with the pressing surface of the first pressing assembly or the pressing surface of the second pressing assembly; Alternatively, the axis of the mounting hole is parallel to the pressing surface of the first pressing assembly or the pressing surface of the second pressing assembly.

10. The battery cell testing fixture according to any one of claims 1 to 5, characterized in that: At least one of the pressing surface of the first pressing assembly and the pressing surface of the second pressing assembly is provided with a positioning structure for positioning the battery cell.

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