Battery cycle test fixture
By designing battery cycle testing fixtures for extruded clamps, pressure sensing plates and pressure equalization plates, the problem of uneven pressure during the battery test is solved, more accurate cycle testing and battery life extension are achieved, and short circuit risk is reduced.
Patent Information
- Application Number
- CN202422216244.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-10
AI Technical Summary
During the testing process of existing battery cycle test fixtures, the pressure exposed to the battery is prone to uneven, affecting the cycle test effect.
The battery cycle test fixture design is adopted, which includes two extrusion clamps, pressure sensing plates and pressure equalization plates. The pressure sensor plates are used to monitor the pressure on the battery cell in real time and adjust them to ensure that the stress at all positions of the battery is uniform. The pressure equalization plates are used to offset the intermediate pressure of the battery and disperse it around. Combined with the limit clamps and heat dissipation hole designs, the extrusion pressure is closer to actual work.
It improves the accuracy and reliability of battery cycle testing, extends the battery cycle life, reduces the risk of short circuits, and avoids battery damage.
Smart Images
Figure CN223166793U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery detection, in particular to a battery cycle test fixture. Background Art
[0002] At present, users widely focus on the performance of lithium-ion batteries. Besides high safety, the long cycle life is also an important issue. Lithium-ion batteries are used after being assembled into modules or packaged. At present, after the batteries are assembled into modules and packaged, there is extrusion force between the batteries, and this extrusion force will affect the life of the batteries and battery modules or battery packs. Therefore, to better reflect the cycle life of the batteries under actual extrusion, it is necessary to apply an upper clamping plate to the batteries to be cycle-tested under the same environmental conditions, and apply the same extrusion force to the batteries for testing, so as to simulate the life of the batteries in the actual module or battery pack environment. However, during the testing process of the existing battery cycle test fixtures, the pressure received by the batteries is prone to be uneven. Specifically, the pressure received in the middle of the battery is greater than that received at the edge of the battery, which is likely to affect the cycle test effect. Content of the Utility Model
[0003] The purpose of the utility model is to provide a battery cycle test fixture, which can make the force on each position of the battery more uniform, can monitor the pressure received by the battery core in real time and adjust it, ensure that the extrusion force under the battery cycle test is closer to the extrusion force under actual working conditions, and thus improve the cycle test effect.
[0004] To achieve the above purpose, the utility model adopts the following technical solutions:
[0005] The utility model discloses a battery cycle test fixture, including: two extrusion clamping plates, the two extrusion clamping plates are arranged at intervals and are connected by an adjusting member, and the battery is installed between the two extrusion clamping plates; a pressure sensing plate, the pressure sensing plate abuts against at least one side of the battery along its thickness direction, and the pressure sensing plate is electrically connected to a pressure data module; a pressure equalizing plate, the pressure equalizing plate is clamped between the pressure sensing plate and one of the extrusion clamping plates or between the battery and one of the extrusion clamping plates.
[0006] In some embodiments, the battery cycle test fixture further includes two limiting clamping plates, the two limiting clamping plates respectively abut against both sides of the battery along its length direction, and both ends of each limiting clamping plate are respectively connected to one side of the two extrusion clamping plates through an adjusting member.
[0007] In some specific embodiments, each limiting clamping plate is provided with a first threaded hole, the extrusion clamping plate is provided with a perforation corresponding to the first threaded hole, the adjusting member is an adjusting bolt, and the adjusting bolt passes through the perforation and cooperates with the first threaded hole.
[0008] In some embodiments, at least one first heat dissipation hole is provided on the limiting clamp.
[0009] In some embodiments, at least one second heat dissipation hole is provided on the extruded clamping plate.
[0010] In some specific embodiments, there are multiple second heat dissipation holes, and the multiple second heat dissipation holes are arranged in multiple rows and columns.
[0011] In some embodiments, the battery cycle test fixture further includes an extrusion piece, which is disposed through one of the extrusion clamps and inserted into the center of the pressure equalizing plate.
[0012] In some specific embodiments, the extrusion member is a bolt, a second threaded hole is provided in the center of the extrusion splint, a blind hole is provided in the center of the pressure equalizing plate, and the extrusion member is passed through the second threaded hole of the extrusion splint and inserted into the blind hole of the pressure equalizing plate.
[0013] In some embodiments, the extrusion clamp and the pressure equalizing plate are both metal parts or alloy parts.
[0014] In some embodiments, a first avoidance groove is provided on one side of the extrusion clamping plate along the height direction of the battery; and a second avoidance groove corresponding to the first avoidance groove is provided on the pressure equalizing plate.
[0015] The beneficial effects of the present invention are as follows: since the battery will continuously consume electrolyte and lithium ions during the cycle process, and the structure of the positive and negative electrode materials will change, the pressure on the battery will become greater and greater. Under normal circumstances, the battery will bulge in the middle. The pressure equalizing plate added to the battery cycle test fixture can just offset the pressure in the middle of the battery and disperse it to the surroundings, thereby extending the cycle life and reducing the risk of short circuits in the battery, ensuring that the extrusion pressure on the battery is the same as the actual working state, and feeding back the real cycle state. In addition, the pressure value adjustment component on the pressure data module fed back by the pressure sensor plate can adjust the pressure on the battery, thereby ensuring that the extrusion pressure under the battery cycle test is closer to the extrusion pressure under actual work, thereby improving the cycle test effect and avoiding damage to the battery.
[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic structural diagram of a battery cycle test fixture according to an embodiment of the present invention;
[0018] Figure 2 This is a schematic diagram of the exploded structure of a battery cycle test fixture according to an embodiment of the present invention;
[0019] Figure 3 is a schematic structural view of a squeezing splint according to an embodiment of the present utility model;
[0020] Figure 4 is a schematic structural view of a limiting splint according to an embodiment of the present utility model;
[0021] Figure 5 is a schematic structural view of an equalizing plate according to an embodiment of the present utility model;
[0022] Figure 6 is a schematic structural view of another squeezing splint according to an embodiment of the present utility model;
[0023] Reference numerals:
[0024] 100, squeezing splint; 110, perforation; 120, second heat dissipation hole; 130, installation groove; 140, first avoidance groove; 150, second threaded hole;
[0025] 200, adjusting member;
[0026] 300, pressure sensing plate;
[0027] 400, equalizing plate; 410, second avoidance groove; 420, blind hole;
[0028] 500, limiting splint; 510, first threaded hole; 520, first heat dissipation hole;
[0029] 600, squeezing member;
[0030] 700, pressure data module; 10, battery. Detailed implementation manners
[0031] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.
[0032] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0033] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may also include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.
[0034] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0035] The present utility model discloses a battery cycle test fixture. Referring to Figure 1 and Figure 2 as shown, the battery cycle test fixture includes extrusion clamping plates 100. The two extrusion clamping plates 100 are arranged at intervals and are connected by an adjusting member 200. The battery 10 is installed between the two extrusion clamping plates 100. The pressure sensing plate 300 abuts against one side of the battery 10 along its thickness direction. The pressure sensing plate 300 is electrically connected to the pressure data module 700. The pressure equalizing plate 400 is clamped between the pressure sensing plate 300 and one of the extrusion clamping plates 100 or between the battery 10 and one of the extrusion clamping plates ...... Figure 1 and Figure 2 are schematic structural diagrams of the battery cycle test fixture with the pressure equalizing plate 400 clamped between the pressure sensing plate 300 and the extrusion clamping plate 100. The battery cycle test fixture with the pressure equalizing plate 400 clamped between the battery 10 and the extrusion clamping plate 100 is not shown.
[0036] It can be understood that during the detection process, one side of the battery 10 in its thickness direction is abutted against an extrusion clamping plate 100, then the pressure sensing plate 300 is abutted against the other side of the battery 10 in its thickness direction, then the pressure equalizing plate 400 is installed on the side of the pressure sensing plate 300 away from the battery 10, and finally another extrusion clamping plate 100 is installed on the pressure equalizing plate 400, and the two extrusion clamping plates 100 are connected together by the adjusting member 200, so as to clamp the battery 10 in the battery cycle test fixture. The adjusting member 200 is adjusted according to the pressure value fed back to the pressure data module 700 by the pressure sensing plate 300, so as to adjust the pressure received by the battery 10, so as to ensure that the extrusion pressure under the cycle test is closer to the extrusion pressure under actual working conditions, thereby improving the cycle test effect and avoiding damage to the battery 10. Since the battery 10 will continuously consume the electrolyte and lithium ions during the cycle process, and the structures of the positive and negative electrode materials will change, the pressure received by the battery 10 will become larger and larger. Usually, the phenomenon that the battery 10 bulges in the middle is more common. The pressure equalizing plate 400 can just offset the pressure received in the middle of the battery 10 and disperse it to the surrounding, extending the cycle life and reducing the risk of short circuit occurring in the battery 10, ensuring that the extrusion pressure received by the battery 10 is the same as the actual working state, and feedbacking the real cycle state, thereby improving the cycle test effect and avoiding damage to the battery at the same time.
[0037] It should be added that in other embodiments of the present invention, two pressure sensing plates 300 and two pressure equalizing plates 400 can be provided. The two pressure sensing plates 300 are respectively located on both sides of the battery 10, and each pressure equalizing plate 400 is respectively clamped between each pressure sensing plate 300 and each extrusion clamping plate 100.
[0038] Reference Figure 1 - Figure 2 As shown, the battery cycle test fixture further includes two limiting clamping plates 500. The two limiting clamping plates 500 respectively abut against both sides of the battery 10 in its length direction, and both ends of each limiting clamping plate 500 are respectively connected to one side of the two extrusion clamping plates 100 through the adjusting member 200. It can be understood that the additional two limiting clamping plates 500 can limit the length direction of the battery 10 and avoid the phenomenon that the battery 10 is displaced between the two extrusion clamping plates 100 during the cycle test.
[0039] Reference Figure 3 - Figure 4 As shown, each limiting clamping plate 500 is provided with a first threaded hole 510, and the extrusion clamping plate 100 is provided with a through hole 110 corresponding to the first threaded hole 510. As Figure 2 shown, the adjusting member 200 is an adjusting bolt, and the adjusting bolt passes through the through hole 110 and cooperates with the first threaded hole 510.
[0040] Optionally, reference Figure 4As shown, the limiting clamping plate 500 is provided with first heat dissipation holes 520. During the actual test process, the battery 10 will generate heat. Setting the first heat dissipation holes 520 on the limiting clamping plate 500 can facilitate the heat dissipation of the battery 10, thereby avoiding the phenomenon of thermal runaway due to excessive temperature of the battery 10 during the cycle test. It should be added that in the embodiments of the present invention, the shape, quantity, and arrangement mode of the first heat dissipation holes 520 can all be selected according to actual needs.
[0041] In some alternative embodiments, the battery cycle test fixture does not have the limiting clamping plate 500, and the adjusting member 200 is set as a bolt and a nut. Both limiting clamping plates 500 are provided with mating holes for the bolt to pass through, and the nut is fitted on the bolt. During the actual working process, the distance between the two limiting clamping plates 500 is adjusted by adjusting the nut, thereby realizing the adjustment of the pressure applied to the battery 10.
[0042] Refer to Figure 2 As shown, the extrusion clamping plate 100 is provided with second heat dissipation holes 120. During the actual test process, the battery 10 will generate heat. Setting the second heat dissipation holes 120 on the limiting clamping plate 500 can facilitate the heat dissipation of the battery 10, thereby avoiding the phenomenon of thermal runaway due to excessive temperature of the battery 10 during the cycle test. Optionally, there are multiple second heat dissipation holes 120, and the multiple second heat dissipation holes 120 are arranged in multiple rows and columns. Thus, the heat dissipation effect can be improved. It should be added that in the embodiments of the present invention, the shape, quantity, and arrangement mode of the second heat dissipation holes 120 can all be selected according to actual needs.
[0043] Refer to Figure 2 As shown, the battery cycle test fixture further includes an extrusion member 600. The extrusion member 600 passes through one extrusion clamping plate 100 and is inserted into the center of the equalizing pressure plate 400. It can be understood that during the actual working process, the pressure can be further adjusted by adjusting the extrusion member 600 to press against the equalizing pressure plate 400. This design can well ensure that the battery 10 is uniformly stressed at the center.
[0044] Optionally, refer to Figure 2 、 Figure 5 - Figure 6 As shown, the extrusion member 600 is a bolt. The center of the extrusion clamping plate 100 is provided with a second threaded hole 150, and the center of the equalizing pressure plate 400 is provided with a blind hole 420. The extrusion member 600 passes through the second threaded hole 150 of the extrusion clamping plate 100 and is inserted into the blind hole 420 of the equalizing pressure plate 400. In order to further prevent the middle of the battery 10 from bulging, rotate the extrusion member 600 to make the extrusion member 600 move towards the battery, pushing the equalizing pressure plate 400 to press the battery more tightly. Especially acting on the middle position of the battery 10, it can better evenly distribute the pressure received in the middle of the battery 10 to the surrounding areas, thereby improving the effect of the equalizing pressure plate 400 in balancing the pressure at each position of the battery.
[0045] Reference Figure 2 As shown in Figure 2 , on the side of the extrusion splint 100 facing the battery 10, there is an installation groove 130, and at least a part of the pressure sensing plate 300 is installed in the installation groove 130. It can be understood that in this way, the pressure sensing plate 300 can be better protected, thereby avoiding the interference of external factors on the detection structure of the pressure sensing plate 300.
[0046] In some embodiments, both the extrusion splint 100 and the equalizing plate 400 are metal parts or alloy parts. Thus, on the one hand, it can ensure the clamping effect on the battery 10, and on the other hand, it can quickly dissipate the heat generated by the battery 10 during the cycling experiment, avoiding the phenomenon of thermal runaway during the cycling experiment.
[0047] In some embodiments, on one side of the extrusion splint 100 along the height direction of the battery 10, there is a first avoidance groove 140; on the equalizing plate 400, there is a second avoidance groove 410 corresponding to the first avoidance groove 140. It can be understood that the first avoidance groove 140 and the second avoidance groove 410 provided can limit the installation directions of the extrusion splint 100 and the equalizing plate 400 during the actual test, so as to achieve foolproof assembly.
[0048] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0049] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A battery cycle test fixture, characterized in that Comprising: Two extrusion clamping plates (100), the two extrusion clamping plates (100) are arranged at intervals and are connected by an adjusting member (200), and the battery (10) is installed between the two extrusion clamping plates (100); A pressure sensing plate (300), the pressure sensing plate (300) abuts against at least one side of the battery (10) in its thickness direction, and the pressure sensing plate (300) is electrically connected to a pressure data module (700); A pressure equalizing plate (400), the pressure equalizing plate (400) is clamped between the pressure sensing plate (300) and one of the extrusion clamping plates (100) or between the battery (10) and one of the extrusion clamping plates (100).
2. The battery cycle test fixture according to claim 1, wherein The battery cycle test fixture further includes two limiting clamping plates (500), the two limiting clamping plates (500) respectively abut against both sides of the battery (10) in its length direction, and both ends of each limiting clamping plate (500) are respectively connected to one side of the two extrusion clamping plates (100) through the adjusting member (200).
3. The battery cycle test fixture according to claim 2, wherein, Each limiting clamping plate (500) is provided with a first threaded hole (510), the extrusion clamping plate (100) is provided with a through hole (110) corresponding to the first threaded hole (510), and the adjusting member (200) is an adjusting bolt, and the adjusting bolt passes through the through hole (110) and cooperates with the first threaded hole (510).
4. The battery cycle test fixture according to claim 2, characterized in that, The limiting clamping plate (500) is provided with at least one first heat dissipation hole (520).
5. The battery cycle test fixture according to any one of claims 1-4, characterized in that The extrusion clamping plate (100) is provided with at least one second heat dissipation hole (120).
6. The battery cycle test fixture according to claim 5, characterized in that, There are multiple second heat dissipation holes (120), and the multiple second heat dissipation holes (120) are arranged in multiple rows and multiple columns.
7. The battery cycle test fixture according to any one of claims 1-4, characterized in that The battery cycle test fixture further includes an extrusion member (600), the extrusion member (600) passes through one of the extrusion clamping plates (100) and is inserted into the center of the pressure equalizing plate (400).
8. The battery cycle test fixture according to claim 7, wherein, The extrusion member (600) is a bolt, the center of the extrusion clamping plate (100) is provided with a second threaded hole (150), the center of the pressure equalizing plate (400) is provided with a blind hole (420), and the extrusion member (600) passes through the second threaded hole (150) of the extrusion clamping plate (100) and is inserted into the blind hole (420) of the pressure equalizing plate (400).
9. The battery cycle test fixture according to any one of claims 1-4, characterized in that, Both the extrusion clamping plate (100) and the pressure equalizing plate (400) are metal parts or alloy parts.
10. The battery cycle test fixture according to any one of claims 1-4, characterized in that, One side of the extrusion clamping plate (100) in the height direction of the battery (10) is provided with a first avoidance groove (140); the pressure equalizing plate (400) is provided with a second avoidance groove (410) corresponding to the first avoidance groove (140); Both the first avoidance groove (140) and the second avoidance groove (410) are used to avoid the pole posts of the battery (10).