Square battery cycle test fixture device
By designing a square battery cycle test fixture device, using movable and fixed ply plates to apply pressure, the problem of lack of constraints in the cycle test of single cells is solved, and the accuracy of the test results and the cycle life of the battery are improved.
Patent Information
- Application Number
- CN202421852939.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-01
AI Technical Summary
The prior art lacks effective constraints in the cycle test of single-cell batteries, which leads to the expansion of the pole sheet during the charging and discharging process, the spacing between the pole sheets increases, and side reactions occur in the electrolyte, affecting the test results and battery cycle life.
A square battery cycle test fixture device is designed, including a movable clamp, a fixed clamp, a limit connection plate and a connecting piece. The movable clamp is driven to approach the fixed clamp by a butterfly screw, and pressure is applied to both sides of the single battery to ensure that the battery is effectively restricted during the test.
By applying pressure, the accuracy and reliability of the cycle test of the single-cell battery is improved, the side reactions of the electrolyte are reduced, the cycle life of the battery is extended, and the test results are more consistent and authentic.
Smart Images
Figure CN222965281U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery testing, in particular to a square battery cycle testing fixture device. Background Art
[0002] With the development of society, the use of sodium lithium ion batteries has increased year by year, whether in the field of power batteries or in the field of energy storage batteries. Improving the cycle performance of batteries can reduce the comprehensive cost of batteries, enhance market competitiveness, and thus increase market share. Therefore, batteries need to be subjected to cycle testing before being officially put into use.
[0003] After the battery terminals are made into modules and battery packs, cycle testing imposes constraints on the batteries. At present, most single batteries do not use constraints during cycle testing, and a small number of manufacturers use simple pressing plates for testing, but the effect is not good. During the charge and discharge process of the battery, the negative electrode expands, the distance between the electrodes increases, causing side reactions in the electrolyte and deteriorating, which affects the cycle performance of the tested battery and reduces the cycle life of the tested battery, resulting in differences between the two situations. Therefore, in order to ensure the consistency and authenticity of the cycle testing and use of single batteries, the utility model proposes a square battery cycle testing fixture device to apply pressure to the single battery and make the cycle testing results more accurate. Content of the Utility Model
[0004] The main purpose of the utility model is to provide a square battery cycle testing fixture device to apply pressure to the single battery and make the cycle testing results of the single battery more accurate.
[0005] To achieve the above object, the square battery cycle test fixture device proposed by the present utility model includes a movable clamping plate, a fixed clamping plate, a limit connecting plate and a connecting member; the number of the limit connecting plates is 2, and the 2 limit connecting plates are directly opposite to each other; the limit connecting plate is provided with an opening penetrating the plate thickness; the fixed clamping plate is fixedly connected to the same side of the 2 limit connecting plates, and the movable clamping plate is movably connected to the side of the 2 limit connecting plates away from the fixed clamping plate; a placement space is formed among the movable clamping plate, the fixed clamping plate and the 2 limit connecting plates, and a single battery is placed in the placement space; a plurality of first connection holes are opened on the same side of the 2 limit connecting plates, and a plurality of second connection holes are penetrated and opened on both sides of the movable clamping plate, and the first connection holes and the second connection holes correspond to each other one by one and are directly opposite; internal threads are provided in both the first connection holes and the second connection holes; the connecting member includes a wing screw, the wing screws correspond to the second connection holes one by one, and the wing screws correspond to the first connection holes one by one; the wing screws are sequentially screwed into the corresponding second connection holes and first connection holes; the wing screws are used to be screwed to push the movable clamping plate to approach the fixed clamping plate, so that the movable clamping plate and the fixed clamping plate respectively abut against and squeeze both sides of the single battery.
[0006] Preferably, a plurality of third connection holes are opened on the side of the 2 limit connecting plates away from the fixed clamping plate, and a plurality of fourth connection holes are opened on both sides of the fixed clamping plate, and the third connection holes and the fourth connection holes correspond to each other one by one and are directly opposite; internal threads are provided in both the third connection holes and the fourth connection holes; the connecting member further includes fixing screws, the fixing screws correspond to the fourth connection holes one by one, and the fixing screws correspond to the third connection holes one by one; the fixing screws are screwed into the corresponding fourth connection holes and third connection holes to connect the 2 limit connecting plates to the fixed clamping plate.
[0007] Preferably, the sides of the limit connecting plates away from the movable clamping plate abut against the fixed clamping plate, the fourth connection holes penetrate the fixed clamping plate, and the fixing screws are used to be sequentially screwed into the corresponding fourth connection holes and third connection holes.
[0008] Preferably, the two sides of the fixed clamping plate respectively abut against the opposite sides of the 2 limit connecting plates, the third connection holes penetrate the limit connecting plates, and the fixing screws are used to be sequentially screwed into the corresponding third connection holes and fourth connection holes.
[0009] Preferably, the fourth connection holes are counterbore holes, and when the fixing screws connect the 2 limit connecting plates to the fixed clamping plate, one end of the fixing screws is buried in the fourth connection holes.
[0010] Preferably, the third connection hole is a counterbore hole. When the fixing screw connects the two limiting connecting plates to the fixing clamp, one end of the fixing screw is buried in the third connection hole.
[0011] Preferably, the opening is a rounded square opening; the number of the openings is two, and the two openings are arranged along the length direction of the limiting connecting plate; the two openings on the same limiting connecting plate share the same center line, and the opening and the limiting connecting plate share the same center line.
[0012] Preferably, three first connection holes and three third connection holes are respectively arranged on one limiting connecting plate, and three symmetric second connection holes are respectively arranged on both sides of the movable clamp; three symmetric fourth connection holes are respectively arranged on both sides of the fixing clamp.
[0013] Preferably, chamfers are arranged on the edges of the movable clamp, the fixing clamp, the limiting connecting plate, and the opening.
[0014] Preferably, the movable clamp, the fixing clamp, and the limiting connecting plate are all rectangular plates.
[0015] In the technical solution of the present utility model, the fixing clamp is fixedly connected to the same side of the two oppositely arranged limiting connecting plates, the movable clamp is movably connected to the side of the two oppositely arranged limiting connecting plates away from the fixing clamp, and a placement space is formed among the movable clamp, the fixing clamp, and the two limiting connecting plates. By turning the butterfly screw, the movable clamp can be pushed to approach the fixing clamp. Therefore, both sides of the single battery placed in the placement space can be squeezed by the movable clamp and the fixing clamp as the movable clamp moves, and the single battery can be constrained during the cycle test, so that the result of the cycle test is more accurate; the limiting connecting plate is provided with an opening penetrating through the plate thickness. Therefore, the opening can help the single battery dissipate heat during the cycle test, the temperature of the single battery can be monitored through the opening, and at the same time, the opening is beneficial to helping the overall square battery cycle test fixture device separate from the single battery. In summary, the square battery cycle test fixture device is simple and practical, easy to operate, can apply pressure to the single battery, and makes the cycle test result more accurate. Description of the Drawings
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0017] Figure 1 It is a top view structural schematic diagram of an embodiment of the square battery cycle test fixture device of the present invention;
[0018] Figure 2 of the square battery cycle test fixture device of the present invention Figure 1 It is a front view structural schematic diagram of the shown embodiment;
[0019] Figure 3 of the square battery cycle test fixture device of the present invention Figure 1 It is a sectional structural schematic diagram along A-A of the shown embodiment of the square battery cycle test fixture device (the connecting piece is not shown);
[0020] Figure 4 of the square battery cycle test fixture device of the present invention Figure 1 It is a structural schematic diagram of the movable clamping plate of the shown embodiment;
[0021] Figure 5 of the square battery cycle test fixture device of the present invention Figure 1 It is a structural schematic diagram of the fixed clamping plate of the shown embodiment;
[0022] Figure 6 of the square battery cycle test fixture device of the present invention Figure 1 It is a structural schematic diagram of the limit connecting plate of the shown embodiment;
[0023] Figure 7 It is a top view structural schematic diagram of another embodiment of the square battery cycle test fixture device of the present invention.
[0024] Explanation of the reference numerals in the drawings:
[0025] 1 - movable clamping plate; 11 - second connecting hole; 2 - fixed clamping plate; 21 - fourth connecting hole; 3 - limit connecting plate; 31 - opening; 32 - first connecting hole; 33 - third connecting hole; 4 - butterfly screw; 5 - placement space.
[0026] The realization, functional features and advantages of the purpose of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Specific embodiments
[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.
[0028] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.
[0029] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0030] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. 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.
[0031] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0032] The present utility model provides a square battery cycle test fixture device.
[0033] Please refer to Figures 1 to 7, the square battery cycling test fixture device includes a movable clamping plate 1, a fixed clamping plate 2, a limit connecting plate 3 and a connecting member; the number of the limit connecting plates 3 is 2, and the 2 limit connecting plates 3 are directly opposite to each other; the limit connecting plate 3 is provided with an opening 31 penetrating through the plate thickness; the fixed clamping plate 2 is fixedly connected to the same side of the 2 limit connecting plates 3, and the movable clamping plate 1 is movably connected to the side of the 2 limit connecting plates 3 away from the fixed clamping plate 2; a placement space 5 is formed among the movable clamping plate 1, the fixed clamping plate 2 and the 2 limit connecting plates 3, and a single battery is placed in the placement space 5; a plurality of first connecting holes 32 are opened on the same side of the 2 limit connecting plates 3, and a plurality of second connecting holes 11 are penetrated and opened on both sides of the movable clamping plate 1, and the first connecting holes 32 and the second connecting holes 11 correspond to each other one by one and are directly opposite; the first connecting holes 32 and the second connecting holes 11 are both provided with internal threads; the connecting member includes a wing screw 4, the wing screws 4 correspond to the second connecting holes 11 one by one, and the wing screws 4 correspond to the first connecting holes 32 one by one; the wing screws 4 are sequentially screwed into the corresponding second connecting holes 11 and the first connecting holes 32; the wing screws 4 are used to be screwed to push the movable clamping plate 1 to approach the fixed clamping plate 2, so that the movable clamping plate 1 and the fixed clamping plate 2 respectively abut against and squeeze both sides of the single battery.
[0034] In the technical solution of the present utility model, the fixed clamping plate 2 is fixedly connected to the same side of the 2 relatively arranged limit connecting plates 3, the movable clamping plate 1 is movably connected to the side of the 2 relatively arranged limit connecting plates 3 away from the fixed clamping plate 2, and the placement space 5 is formed among the movable clamping plate 1, the fixed clamping plate 2 and the 2 limit connecting plates 3. By screwing the wing screw 4, the movable clamping plate 1 can be pushed to approach the fixed clamping plate 2. Therefore, both sides of the single battery placed in the placement space 5 can be squeezed by the movable clamping plate 1 and the fixed clamping plate 2 as the movable clamping plate 1 moves, and the single battery can be restricted during the cycling test, so that the result of the cycling test is more accurate; the limit connecting plate 3 is provided with an opening 31 penetrating through the plate thickness. Therefore, the opening 31 can help the single battery dissipate heat during the cycling test, the temperature of the single battery can be monitored through the opening 31, and at the same time, the opening 31 is beneficial to help the overall square battery cycling test fixture device separate from the single battery. To sum up, the square battery cycling test fixture device is simple and practical, convenient to operate, can apply pressure to the single battery, and makes the cycling test result more accurate.
[0035] Specifically, the minimum distance between the movable clamping plate 1 and the fixed clamping plate 2 is less than the thickness of the single battery by 1 - 4 mm; the movable clamping plate 1 and the fixed clamping plate 2 respectively press two largest faces of the single battery; the second connection hole 11 on one side of the movable clamping plate 1 is directly opposite to the first connection hole 32 of one of the limit connection plates 3, and the second connection hole 11 on the other side of the movable clamping plate 1 is directly opposite to the first connection hole 32 of the other limit connection plate 3.
[0036] Specifically, the movable clamping plate 1, the fixed clamping plate 2 and the limit connection plate 3 are all aluminum plates with a thickness of 10 - 12 mm. The surfaces of the aluminum plates are treated by oxidation, and the maximum surface roughness Ra is 0.1 mm; the diameter of the first connection hole 32 is 6 - 6.5 mm and the depth is 20 mm; the diameter of the second connection hole 11 is 6 - 6.5 mm; the size of the butterfly screw 4 is M6 * 25 mm.
[0037] Preferably, a plurality of third connection holes 33 are provided on one side of the two limit connection plates 3 away from the fixed clamping plate 2, and a plurality of fourth connection holes 21 are provided on both sides of the fixed clamping plate 2. The third connection holes 33 and the fourth connection holes 21 correspond to each other one by one and are directly opposite; internal threads are provided in both the third connection holes 33 and the fourth connection holes 21; the connecting member further includes fixing screws, the fixing screws correspond to the fourth connection holes 21 one by one, and the fixing screws also correspond to the third connection holes 33 one by one; the fixing screws are screwed into the corresponding fourth connection holes 21 and third connection holes 33 to connect the two limit connection plates 3 to the fixed clamping plate 2.
[0038] Specifically, the diameters of both the third connection holes 33 and the second connection holes 11 are 6 - 6.5 mm; the fixing screws are M6 * 20 mm stainless steel socket head cap screws. Of course, in another embodiment, the fixing screws can also be screws of other types.
[0039] Preferably, one side of the limit connection plate 3 away from the movable clamping plate 1 abuts against the fixed clamping plate 2, the fourth connection holes 21 penetrate through the fixed clamping plate 2, and the fixing screws are used to be screwed into the corresponding fourth connection holes 21 and third connection holes 33 in sequence.
[0040] Please refer to Figures 1 to 3, specifically, the fourth connection hole 21 on one side of the fixed splint 2 is aligned with the third connection hole 33 of one of the limit connection plates 3, and the fourth connection hole 21 on the other side of the fixed splint 2 is aligned with the third connection hole 33 of the other limit connection plate 3; the central axes of the first connection hole 32 and the third connection hole 33 of the same limit connection plate 3 are parallel to each other; the depth of the third connection hole 33 is 20 mm.
[0041] Preferably, both sides of the fixed splint 2 are respectively abutted against one side of the two limit connection plates 3 opposite to each other, the third connection hole 33 penetrates through the limit connection plate 3, and the fixing screw is used to be sequentially screwed into the corresponding third connection hole 33 and the fourth connection hole 21.
[0042] Please refer to Figure 7 , specifically, the fourth connection hole 21 on one side of the fixed splint 2 is aligned with the third connection hole 33 of one of the limit connection plates 3, and the fourth connection hole 21 on the other side of the fixed splint 2 is aligned with the third connection hole 33 of the other limit connection plate 3; the central axes of the first connection hole 32 and the third connection hole 33 of the same limit connection plate 3 are perpendicular to each other; the depth of the fourth connection hole 21 is 20 mm.
[0043] Preferably, the fourth connection hole 21 is a counterbore hole. When the fixing screw connects the two limit connection plates 3 to the fixed splint 2, one end of the fixing screw is buried in the fourth connection hole 21.
[0044] Please refer to Figure 3 , specifically, the counterbore depth of the fourth connection hole 21 is 6 mm; after the fixed splint 2 is fixedly connected to the limit connection plate 3, the head of the fixing screw does not protrude beyond the plane of the fixed splint 2.
[0045] Preferably, the third connection hole 33 is a counterbore hole. When the fixing screw connects the two limit connection plates 3 to the fixed splint 2, one end of the fixing screw is buried in the third connection hole 33.
[0046] Specifically, the counterbore depth of the third connection hole 21 is 6 mm; after the fixed splint 2 is fixedly connected to the limit connection plate 3, the head of the fixing screw does not protrude beyond the plane of the limit connection plate 3.
[0047] Preferably, the opening 31 is a rounded square opening; the number of the openings 31 is two, and the two openings 31 are arranged along the length direction of the limit connection plate 3; the two openings 31 of the same limit connection plate 3 share the same central line, and the opening 31 and the limit connection plate 3 share the same central line.
[0048] Please refer to Figure 2 , specifically, the opening 31 is located in the middle of the limit connecting plate 3. The rounded square hole can make the edge of the opening 31 smoother and more beautiful, preventing the staff from being scratched when separating the whole square battery cycle test fixture device from the single battery through the opening 21.
[0049] Preferably, 3 first connection holes 32 and 3 third connection holes 33 are respectively arranged on 1 limit connecting plate 3, and 3 symmetric second connection holes 11 are respectively arranged on both sides of the movable clamping plate 1; 3 symmetric fourth connection holes 21 are respectively arranged on both sides of the fixed clamping plate 2.
[0050] The connection of multiple first connection holes 32 and multiple second connection ports 11, and the connection of multiple third connection holes 33 and multiple fourth connection holes 21 can ensure the stable connection between the movable clamping plate 1 and the limit connecting plate 3, and between the fixed clamping plate 2 and the limit connecting plate 3, so that the movable clamping plate 1 and the fixed clamping plate 2 can provide sufficient extrusion force for the single battery to restrain the single battery. The second connection holes 11 are symmetrically distributed on both sides of the movable clamping plate 1, and the fourth connection holes 21 are symmetrically distributed on both sides of the fixed clamping plate 2, which is beneficial to the balanced internal force of the single battery and the square battery cycle test fixture device when squeezing the single battery.
[0051] Preferably, chamfers are provided at the edges of the movable clamping plate 1, the fixed clamping plate 2, the limit connecting plate 3, and the edge of the opening 31.
[0052] The chamfers are beneficial to preventing the staff from being scratched when using the square battery cycle test fixture device. At the same time, the chamfers can make the edges of the components more rounded and the appearance more beautiful. Please refer to Figures 3 to 6 , specifically, the chamfer is a 1mm bevel chamfer. Further, chamfered edges are provided at the openings of the first connection hole 32, the second connection hole 11, the third connection hole 33, and the fourth connection hole 21.
[0053] Preferably, the movable clamping plate 1, the fixed clamping plate 2, and the limit connecting plate 3 are all rectangular plates. The rectangular plate can ensure that the single battery is evenly stressed when the movable clamping plate 1 and the fixed clamping plate 2 squeeze the single battery, and can also make the structure of the square battery cycle test fixture device more regular and beautiful.
[0054] The above are only the preferred embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structural transformation made under the concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.
Claims
1. A square battery cycle test fixture device, characterized in that: The invention comprises a movable splint (1), a fixed splint (2), a limit connecting plate (3) and a connecting piece; the number of the limit connecting plates (3) is two, and the two limit connecting plates (3) are opposite to each other; the limit connecting plate (3) is provided with an opening (31) penetrating the plate thickness; the fixed splint (2) is fixedly connected to the same side of the two limit connecting plates (3), and the movable splint (1) is movably connected to the side of the two limit connecting plates (3) away from the fixed splint (2); a placement space (5) is formed between the movable splint (1), the fixed splint (2) and the two limit connecting plates (3), and the single battery is placed in the placement space (5); a plurality of first connection holes (32) are provided on the same side of the two limit connecting plates (3), and the movable splint (1) has a plurality of first connection holes (32) and a plurality of first connection holes (32) on the same side of the two limit connecting plates (3). A plurality of second connection holes (11) are provided through both sides, the first connection holes (32) correspond to the second connection holes (11) one by one and are directly opposite to each other; the first connection holes (32) and the second connection holes (11) are both provided with internal threads; the connection member comprises a butterfly screw (4), the butterfly screw (4) corresponds to the second connection holes (11) one by one, and the butterfly screw (4) corresponds to the first connection holes (32) one by one; the butterfly screw (4) is screwed into the corresponding second connection holes (11) and the first connection holes (32) in sequence; the butterfly screw (4) is used to be screwed to push the movable clamping plate (1) to approach the fixed clamping plate (2), so that the movable clamping plate (1) and the fixed clamping plate (2) respectively abut and squeeze the two sides of the single battery.
2. The square battery cycle test fixture device according to claim 1, characterized in that: A plurality of third connection holes (33) are provided on one side of the two limit connection plates (3) away from the fixed clamp plate (2), and a plurality of fourth connection holes (21) are provided on both sides of the fixed clamp plate (2), and the third connection holes (33) and the fourth connection holes (21) correspond one to one and are directly opposite to each other; the third connection holes (33) and the fourth connection holes (21) are both provided with internal threads; the connecting member also includes a fixing screw, and the fixing screw corresponds one to one to the fourth connection hole (21), and the fixing screw corresponds one to one to the third connection hole (33); the fixing screw is screwed into the corresponding fourth connection hole (21) and the third connection hole (33) to connect the two limit connection plates (3) to the fixed clamp plate (2).
3. The square battery cycle test fixture device according to claim 2, characterized in that: The side of the limiting connecting plate (3) away from the movable clamping plate (1) is in contact with the fixed clamping plate (2), the fourth connecting hole (21) passes through the fixed clamping plate (2), and the fixing screw is used to be screwed into the corresponding fourth connecting hole (21) and the third connecting hole (33) in sequence.
4. The square battery cycle test fixture device according to claim 2, characterized in that: The two sides of the fixing clamp plate (2) respectively abut against the opposite sides of the two limiting connecting plates (3), the third connecting hole (33) passes through the limiting connecting plate (3), and the fixing screw is used to be screwed into the corresponding third connecting hole (33) and the fourth connecting hole (21) in sequence.
5. The square battery cycle test fixture device according to claim 3, characterized in that: The fourth connection hole (21) is a countersunk hole, and when the fixing screw connects the two limit connection plates (3) to the fixed clamping plate (2), one end of the fixing screw is embedded in the fourth connection hole (21).
6. The square battery cycle test fixture device according to claim 4, characterized in that: The third connection hole (33) is a countersunk hole. When the fixing screw connects the two limit connection plates (3) to the fixed clamping plate (2), one end of the fixing screw is embedded in the third connection hole (33).
7. The square battery cycle test fixture device according to claim 1, characterized in that: The opening (31) is a square opening with rounded corners; the number of the openings (31) is two, and the two openings (31) are arranged along the length direction of the limiting connection plate (3); the two openings (31) of the same limiting connection plate (3) share a common center line, and the opening (31) and the limiting connection plate (3) share a common center line.
8. The square battery cycle test fixture device according to claim 2, characterized in that: Three first connection holes (32) and three third connection holes (33) are respectively arranged on one of the limit connection plates (3); three symmetrical second connection holes (11) are respectively arranged on two sides of the movable clamp plate (1); and three symmetrical fourth connection holes (21) are respectively arranged on two sides of the fixed clamp plate (2).
9. The square battery cycle test fixture device according to claim 7, characterized in that: The edge of the movable clamping plate (1), the edge of the fixed clamping plate (2), the edge of the limiting connecting plate (3), and the edge of the opening (31) are all chamfered.
10. The square battery cycle test fixture device according to claim 1, characterized in that: The movable clamping plate (1), the fixed clamping plate (2) and the position-limiting connecting plate (3) are all rectangular plates.