Anti-falling battery cell clamp

Abstract

The utility model discloses a kind of anti-falling battery cell clamps, including first clamp, second clamp and fastening structure, the first clamp and second clamp are oppositely arranged and the end of one side of oppositely arranged is equipped with bending part, the first clamp, second clamp and bending part are enclosed and are used for installing the mounting space of battery cell, the fastening structure is detachably set in the outer periphery of first clamp and second clamp for limiting first clamp and second clamp;The utility model is equipped with bending part in the end of one side of two clamps oppositely arranged, by setting the relative clamp with bending part and external fastening structure, it is jointly constituted to a stable mounting space, both can reliably install fixed battery cell, can effectively prevent battery cell from falling off from the bottom of clamp in the process of carrying, and fastening structure is detachable, convenient for the assembly and disassembly of battery cell.

Description

Technical Field

[0001] This utility model relates to the field of battery cell testing fixtures, and in particular to a battery cell clamp that prevents the battery cell from falling off. Background Technology

[0002] Lithium-ion and sodium-ion battery cells are widely used in electric vehicles, electrochemical energy storage, 3C products and other fields. According to the cell structure, they can be divided into pouch cells, cylindrical cells and square aluminum-cased cells. Among them, square aluminum-cased cells have large size, high capacity, low internal resistance and high system integration efficiency, and occupy an important position in lithium-ion and sodium-ion battery cells.

[0003] Square aluminum-cased battery cells are large in size and have high capacity. During charging and discharging, the repeated insertion and extraction of ions in the electrode plates will generate significant stress, leading to internal core deformation, cell bulging, elongated ion pathways, and continuous deterioration in long-term performance testing. Therefore, a certain amount of binding force needs to be applied to control this.

[0004] Commonly used long-term performance testing fixtures for square aluminum-cased battery cells consist of two aluminum or steel plates. Each fixture requires four threaded holes, resulting in high manufacturing costs. Bolts are tightened at the four corners for restraint, and this tightening must follow certain principles, applying clamping force evenly along the diagonals. Figure 1 Tighten the bolts repeatedly in the order of “①→③→②→④→①” until the battery cell is secured. This process can be confusing and cause uneven stress on the battery cell, affecting long-term performance testing.

[0005] Patent CN115684671A discloses a lithium-ion battery testing fixture. This fixture features a newly added graduated bolt structure. The parallel arrangement of the upper and lower clamps ensures uniform force distribution throughout the lithium-ion battery during testing. A constant-pressure plate is positioned between the upper and lower clamps, which absorbs the expansion and deformation of the lithium-ion battery during charge-discharge cycles and ensures good heat dissipation. However, the method of securing the battery cells must be... Figure 1 The process is complex; if the clamp is placed vertically, the battery cell may fall off.

[0006] Patent CN218122027U discloses a lithium-ion battery testing fixture. The lithium-ion battery is placed on a base to ensure stability during testing or handling, and a temperature sensor can monitor the cell surface temperature in real time for early warning. However, the method of securing the battery cell must be in accordance with… Figure 1 The method is complex and requires complicated operation. Utility Model Content

[0007] The purpose of this utility model is to provide a battery cell clamp that prevents the battery cell from falling off, which solves the problems of existing battery cell clamps being complicated to operate and having poor clamping effect on the battery cells.

[0008] This utility model is implemented as follows: This utility model provides an anti-detachment battery cell clamp, including a first clamp, a second clamp, and a fastening structure. The first clamp and the second clamp are arranged opposite to each other, and each of their opposite ends is provided with a bent portion. The first clamp, the second clamp, and the bent portion form an installation space for installing the battery cell. The fastening structure is detachably sleeved on the outer periphery of the first clamp and the second clamp to limit the position of the first clamp and the second clamp.

[0009] This utility model has a bent part at one end of the two clamps facing each other. By setting the opposing clamps with bent parts and the external fastening structure, a stable installation space is formed. This can not only reliably install and fix the battery cell, but also effectively prevent the battery cell from falling off the bottom of the clamp during transportation. Moreover, the fastening structure is detachable, which facilitates the installation and removal of the battery cell.

[0010] A further technical solution of this utility model is: the side of the first clamp and the second clamp that are opposite to each other is a plane.

[0011] The surface of the clamp that contacts the battery cell is a plane, which ensures a tight and complete fit with the large surface of the battery cell, thereby providing uniform clamping force, avoiding the impact of uneven force on test results, and better simulating the constraint conditions in actual applications.

[0012] A further technical solution of this utility model is: the first clamp and the second clamp are provided with grooves on their outer peripheries, and the fastening structure is sleeved on the outer periphery of the first clamp and the second clamp along the grooves.

[0013] The grooves on the outer periphery of the clamp provide clear positioning and guidance for the fastening structure, which can effectively prevent the fastening structure from sliding or misaligning during fastening and use, and ensure the stability and reliability of the clamping force.

[0014] A further technical solution of this utility model is that the width of the groove gradually decreases from the outside to the inside.

[0015] The groove adopts a trapezoidal structure, which can better limit and clamp the fastening structure, further preventing it from coming out of the groove and enhancing the stability and safety of the overall structure.

[0016] A further technical solution of this utility model is that the minimum height h2 of the groove is greater than the height h3 of the fastening structure.

[0017] This dimensional relationship ensures that the fastening structure can be installed smoothly and without interference into the groove, while also ensuring that the groove has sufficient space to contain and limit the fastening structure, thus achieving effective constraint.

[0018] A further technical solution of this utility model is: the fastening structure includes a steel strip, the steel strip is arranged around the outer periphery of the first clamp and the second clamp, the two ends of the steel strip are provided with connecting ears, and the connecting ears are connected by fasteners.

[0019] The method of using steel straps in conjunction with connecting ears and fasteners for binding is simple and quick to operate. It is more efficient than the traditional multi-point bolt tightening method and can better simulate the real application scenario of steel strap binding commonly used in battery modules.

[0020] A further technical solution of this utility model is: the fastener includes a bolt and a nut, the bolt passes through a threaded hole on the connecting lug and is fastened by the nut.

[0021] The connection is securely fastened using bolts and nuts. Bolts are tightened with a torque wrench, and the preload is controlled by adjusting the torque and the number of bolts and nuts. The operation is very convenient.

[0022] A further technical solution of this utility model is: a pressure sensor is detachably installed in the installation space, and the thickness W2 of the pressure sensor is equal to the thickness W0 of the battery cell.

[0023] By using pressure sensors, the actual clamping force applied to the battery cell can be simulated based on the tightness of the fastening structure. To control the clamping force of battery cells of different sizes and models, the key parameters such as the number of bolts and nuts and the torque of the torque wrench can be selected by referring to the obtained parameter diagram, providing data support for determining the optimal clamping force parameters for different models of battery cells.

[0024] A further technical solution of this utility model is: the sum of the widths of the bent portion of the first clamp and the bent portion of the second clamp, 2W1, is less than the thickness W0 of the battery cell.

[0025] This dimensional relationship ensures that the battery cell can sit stably on the two bends, while the main body of the clamp can fully contact the side of the battery cell to provide effective clamping, thus ensuring both the stability of the support and the effectiveness of the clamping.

[0026] The beneficial effects of this utility model are as follows: The clamp structure of this utility model is simple, easy to operate, and has good reliability; the two clamps are provided with bent parts at their opposite ends, and the opposing clamps and external fastening structure together form a stable installation space, which can not only reliably install and fix the battery cells, but also effectively prevent the battery cells from falling off the bottom of the clamps during transportation; no threaded holes are needed on the clamps, which can reduce the manufacturing cost of the clamps; moreover, the fastening structure is detachable, which facilitates the installation and removal of the battery cells; the clamping force is provided by binding the clamps with steel strips, which better fits the actual application scenario of the battery cells, and can also verify the reliability of the steel strip material, providing reference value for the selection of steel strips at the battery module level; the bolts are tightened with a torque wrench, and the preload is controlled by controlling the torque and the number of "bolts + nuts", making the operation process very convenient. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of tightening bolts on a traditional test fixture provided by this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the first clamp and the second clamp provided by this utility model, which are arranged opposite to each other;

[0029] Figure 3 Exploded view of the fastening structure provided by this utility model;

[0030] Figure 4 This is a schematic diagram of the clamp provided by this utility model in use;

[0031] Figure 5 This is a schematic diagram showing the relationship between the clamp and the pressure sensor provided by this utility model.

[0032] Reference numerals: 0. Battery cell; 1. First clamp; 2. Second clamp; 3. Fastening structure; 31. Steel strip; 32. Fastener; 33. Threaded hole; 4. Bending part; 5. Bolt; 6. Nut; 7. Groove; 8. Pressure sensor; 101. First surface; 102. Second surface; 103. Third surface; 104. Fourth surface; 111. First groove; 112. Second groove; 113. Third groove. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0034] Example 1:

[0035] like Figure 2-5 The illustrated anti-detachment battery cell clamp includes a first clamp 1, a second clamp 2, and a fastening structure 3. The first clamp 1 and the second clamp 2 are arranged opposite to each other, and each of their opposite ends is provided with a bent portion 4. The first clamp 1, the second clamp 2, and the bent portion 4 form an installation space for installing the battery cell 0. The fastening structure 3 is detachably sleeved on the outer periphery of the first clamp 1 and the second clamp 2 to limit the first clamp 1 and the second clamp 2.

[0036] This utility model has a bent part 4 at one end of the two clamps facing each other. By setting the opposing clamps with the bent part 4 and the external fastening structure 3, a stable installation space is formed. This can not only reliably install and fix the battery cell 0, but also effectively prevent the battery cell 0 from falling off the bottom of the clamp during transportation. Moreover, the fastening structure 3 is detachable, which facilitates the installation and removal of the battery cell 0.

[0037] In this embodiment, the sides of the first clamp 1 and the second clamp 2 that are opposite each other are flat. The flat surface of the clamp that contacts the battery cell 0 ensures a tight and complete fit with the large surface of the battery cell 0, thereby providing a uniform clamping force, avoiding uneven force from affecting the test results, and better simulating the constraint conditions in actual applications.

[0038] In this embodiment, the first clamp 1 and the second clamp 2 are provided with grooves 7 on their outer peripheries, and the fastening structure 3 is sleeved on the outer periphery of the first clamp 1 and the second clamp 2 along the grooves 7. The grooves 7 on the outer periphery of the clamps provide clear positioning and guidance for the fastening structure 3, which can effectively prevent the fastening structure 3 from sliding or misaligning during fastening and use, and ensure the stability and reliability of the clamping force.

[0039] In this embodiment, the width of the groove 7 gradually decreases from the outside to the inside. The groove 7 adopts a trapezoidal structure, which can better limit and clamp the fastening structure 3, further preventing it from falling out of the groove 7, and enhancing the stability and safety of the overall structure.

[0040] In this embodiment, the minimum height h2 of the groove 7 is greater than the height h3 of the fastening structure 3. This dimensional relationship ensures that the fastening structure 3 can be smoothly and without interference installed in the groove 7, while also ensuring that the groove 7 has sufficient space to contain and limit the fastening structure 3, thus achieving effective constraint.

[0041] In this embodiment, the fastening structure 3 includes a steel strip 31, which is arranged around the outer periphery of the first clamp 1 and the second clamp 2. Connecting ears are provided at both ends of the steel strip 31, and the connecting ears are connected by fasteners 32. The binding method using the steel strip 31 in conjunction with the connecting ears and fasteners 32 is simple and quick to operate, more efficient than the traditional multi-point bolt tightening method, and better simulates the real-world application scenario of steel strip binding commonly used in battery modules.

[0042] In this embodiment, the fastener 32 includes a bolt 5 and a nut 6. The bolt 5 passes through the threaded hole 33 on the connecting lug and is fastened by the nut 6. Using bolts 5 and nuts 6 for fastening ensures a reliable connection. Bolts 5 are tightened using a torque wrench, and the preload is controlled by adjusting the torque and the number of bolts and nuts, making the operation very convenient.

[0043] In this embodiment, a pressure sensor 8 is detachably installed in the installation space, and the thickness W2 of the pressure sensor 8 is equal to the thickness W0 of the battery cell 0.

[0044] By using pressure sensors, the actual clamping force applied to the battery cell can be simulated based on the tightness of the fastening structure. To control the clamping force of battery cells of different sizes and models, the key parameters such as the number of bolts and nuts and the torque of the torque wrench can be selected by referring to the obtained parameter diagram, providing data support for determining the optimal clamping force parameters for different models of battery cells.

[0045] In this embodiment, the sum of the widths 2W1 of the bent portion 4 of the first clamp 1 and the bent portion 4 of the second clamp 2 is less than the thickness W0 of the battery cell 0. This dimensional relationship ensures that the battery cell 0 can be stably placed on the two bent portions 4, while the main body of the clamp can fully contact the side of the battery cell 0 to provide effective clamping, thus ensuring both the stability of the support and the effectiveness of the clamping.

[0046] In this embodiment, please refer to Figure 2 and Figure 3This utility model provides an anti-detachment battery cell clamp. The first clamp 1 and the second clamp 2 have the same structure, similar to an L-shape, and the same size. Their materials can be steel or aluminum. A bent part 4 is provided at the bottom to form a base structure. The main body has grooves 7 on three vertical surfaces to facilitate the binding of the steel strip 31, and a flat structure on one surface to facilitate the fixing of the battery cell 0. The first surface 101 contains two first grooves 111, the second surface 102 contains two second grooves 112, the third surface 103 contains two third grooves 113, and the fourth surface 104 is a flat structure. The fastening structure 3 includes a steel strip 31, which can bind the clamp along the two grooves 7 on the first surface 101, the second surface 102, and the third surface 103. The number of threaded holes 33 on each steel strip 31 is set to an even number and ≥2 to facilitate the fixing of bolts 5 and nuts 6. The minimum height of the groove 7 is h2, and the height of the steel strip 31 is h3, satisfying h2≥h3.

[0047] Please see Figure 4 The rear side view of the clamp on cell 0, the first clamp 1 and the second clamp 2, h1 is the height of the main body excluding the height of the bottom support, w1 is the length of the bottom support excluding the main body; cell 0, the shoulder height of the cell is H0, the thickness of the cell is W0; satisfying H0≥h1, W0≥2w1.

[0048] The working principle of this utility model is as follows: The operator first places the battery cell 0 between the first clamp 1 and the second clamp 2. The battery cell 0 is placed on the bent part 4 of the first clamp 1 and the second clamp 2. The fourth surface 104 of the two clamps and the large surface of the battery cell 0 are tightly attached. Along the upper and lower grooves 7 of the first clamp 1 and the second clamp 2, the steel strip 31 is put on, the bolt 5 passes through the threaded hole 33, the nut 6 is put on, and the torque wrench is used to tighten it. The operation process is very convenient.

[0049] As another embodiment, considering that the clamping force of the battery cell has a certain impact on the 0-cycle performance of the battery cell, in this embodiment, without installing the battery cell, the operator first places the pressure sensor 9 between the two clamps. The pressure sensor 9 is placed on the bent part of the clamp, and the fourth surface 104 of the two clamps and the large surface of the pressure sensor 9 are in close contact. Figure 5 As shown; along the two grooves 7 of the clamp, the steel strip 31 is put on, the bolt 5 passes through the threaded hole 33, and the nut 6 is put on.

[0050] Each of the upper and lower steel strips 31 is fitted with a pair of "bolts 5 + nuts 6". After setting the torque A1, tightening the bolts 5 will give the pressure sensor 9 degree X1. Similarly, A1, A2...An (values ​​increase sequentially) and X1, X2...Xn (values ​​increase sequentially) are obtained.

[0051] Each of the upper and lower steel strips 31 is fitted with two pairs of "bolts 5 + nuts 6". After setting the torque B1 and tightening the bolts 5, the pressure sensor 9 degree Y1 is obtained. B1, B2...Bn (the values ​​increase in sequence) and Y1, Y2...Yn (the values ​​increase in sequence) are obtained in the same way.

[0052] Each of the upper and lower steel strips 31 has three pairs of "bolts 5 + nuts 6". After setting the torque C1, tightening the bolts 5 will give the pressure sensor 9 degree Z1. Similarly, C1, C2...Cn (values ​​increase sequentially) and Z1, Z2...Zn (values ​​increase sequentially) can be obtained.

[0053] Based on the above data, a parameter diagram can be obtained for the number of "5 bolts + 6 nuts", torque wrench torque, and clamping force. To achieve zero clamping force control for different sizes and models of battery cells, the key parameters for selecting the number of "5 bolts + 6 nuts" and torque wrench torque can be selected by referring to the obtained parameter diagram.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cell clamp to prevent cell detachment, characterized in that: The device includes a first clamp (1), a second clamp (2), and a fastening structure (3). The first clamp (1) and the second clamp (2) are arranged opposite to each other, and each of their opposite ends is provided with a bent portion (4). The first clamp (1), the second clamp (2), and the bent portion (4) form an installation space for installing the battery cell (0). The fastening structure (3) is detachably sleeved on the outer periphery of the first clamp (1) and the second clamp (2) to limit the first clamp (1) and the second clamp (2).

2. The anti-detachment battery cell clamp according to claim 1, characterized in that: The side of the first clamp (1) that is opposite to the second clamp (2) is a plane.

3. The anti-detachment battery cell clamp according to claim 2, characterized in that: The first clamp (1) and the second clamp (2) are provided with grooves (7) on their outer periphery, and the fastening structure (3) is sleeved on the outer periphery of the first clamp (1) and the second clamp (2) along the grooves (7).

4. The anti-detachment battery cell clamp according to claim 3, characterized in that: The groove (7) gradually decreases in width from the outside to the inside.

5. The anti-detachment battery cell clamp according to claim 4, characterized in that: The minimum height h2 of the groove (7) is greater than the height h3 of the fastening structure (3).

6. A battery cell clamp according to any one of claims 1-5, characterized in that: The fastening structure (3) includes a steel strip (31) which is arranged around the outer periphery of the first clamp (1) and the second clamp (2). The steel strip (31) has connecting ears at both ends, and the connecting ears are connected by fasteners (32).

7. The anti-detachment battery cell clamp according to claim 6, characterized in that: The fastener (32) includes a bolt (5) and a nut (6), the bolt (5) being fastened by the nut (6) through a threaded hole (33) on the connecting lug.

8. A battery cell clamp according to any one of claims 1-5, characterized in that: The installation space is detachably equipped with a pressure sensor (8), the thickness W2 of which is equal to the thickness W0 of the battery cell (0).

9. A battery cell clamp according to any one of claims 1-5, characterized in that: The sum of the widths of the bent portion of the first clamp (1) and the bent portion of the second clamp (2), 2W1, is less than the thickness W0 of the battery cell.

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