Clamping plate, battery module and battery pack

Abstract

The application provides a clamp plate, a battery module and a battery pack. The clamp plate comprises a clamp plate body, the clamp plate body has two end faces and two plate faces, the end faces and the plate faces are connected to each other to define a connecting edge line, a plurality of first through holes and a plurality of through hole groups are arranged on the clamp plate body, the plurality of first through holes are arranged at intervals and penetrate the two plate faces, the plurality of through hole groups correspond to the plurality of first through holes one by one, each through hole group comprises a plurality of second through holes arranged at intervals along the axis of the first through hole, and the second through holes of each through hole group penetrate the two plate faces and the corresponding first through hole. The above-mentioned scheme of the application not only can guide the airflow into the clamp plate through the first through hole, so that the airflow exchanges heat with the clamp plate to manage the temperature of the battery cell, but also can guide the airflow to the surface of the battery cell through the second through hole, so that the airflow directly contacts the battery cell to directly manage the temperature of the battery cell. In this way, the heat exchange efficiency of the battery cell is improved, so as to improve the reliability of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a clamping plate, a battery module, and a battery pack. Background Technology

[0002] The battery pack includes a housing assembly with a mounting cavity and battery modules disposed within the mounting cavity. Each battery module comprises multiple electrically connected cells. During use, battery cells generate heat, or excessively low ambient temperatures can hinder their normal operation. Therefore, temperature management of the battery cells is necessary, such as cooling or heating them to ensure they operate at a suitable temperature.

[0003] In related technologies, ventilation is used to manage the temperature of battery cells. Specifically, one plate of the housing assembly has an air inlet, a flow channel, and a connecting hole connected in sequence, while another plate has an air outlet. A clamping plate is placed between two adjacent battery cells, and a longitudinal air channel is provided on the clamping plate. One end of the longitudinal air channel is connected to the connecting hole, and the other end is connected to the part of the mounting cavity located between the air outlet and the battery module. Airflow sequentially enters the longitudinal air channel through the air inlet, the flow channel, and the connecting hole. In the longitudinal air channel, the airflow exchanges heat with the clamping plate, thereby carrying away the heat energy absorbed by the clamping plate from the battery cells, or heating the battery cells through the clamping plate. Then, the airflow in the clamping plate is discharged from the air outlet. In this way, the temperature of the battery cells is managed. However, the heat exchange of the battery cells requires the clamping plate as an intermediate component, resulting in low heat exchange efficiency of the battery cells and affecting the reliability of the battery pack. Utility Model Content

[0004] The embodiments of this application provide a clamping plate, a battery module, and a battery pack, which can improve the heat exchange efficiency of the battery cells.

[0005] In a first aspect, embodiments of this application provide a clamping plate, which includes a clamping plate body. The clamping plate body has two oppositely arranged end faces and two oppositely arranged plate surfaces. The two end faces are located between the two plate surfaces and are connected to the two plate surfaces. The end faces and plate surfaces are interconnected to define a connecting edge line. The clamping plate body is provided with a plurality of first through holes and a plurality of through hole groups. The plurality of first through holes are spaced apart along the length direction of the connecting edge line and penetrate the two end faces. The plurality of through hole groups are spaced apart along the length direction of the connecting edge line and correspond one-to-one with the plurality of first through holes. Each through hole group includes a plurality of second through holes spaced apart along the axis of the first through holes. The second through holes of each through hole group penetrate the two plate surfaces and the corresponding first through holes.

[0006] In some embodiments, a plurality of buffer grooves are provided on the plate surface, and the plurality of buffer grooves correspond one-to-one with a plurality of through hole groups, with the through hole groups being disposed on the bottom wall of the corresponding buffer groove.

[0007] In some embodiments, the depth of the buffer groove is Da, satisfying: 0.5mm≤Da≤0.8mm; and / or, the buffer groove is a through groove extending through the axis of the first through hole.

[0008] In some embodiments, the inner wall of the buffer groove includes a bottom wall and a side wall connected to each other, with the bottom wall transitioning to the side wall in an arc.

[0009] In some embodiments, the bottom wall of the groove transitions to the side wall of the groove to form a rounded corner surface, and the radius of the rounded corner surface is 0.4π to 0.6π.

[0010] In some embodiments, the inner wall of the buffer groove includes a bottom wall and a side wall connected to each other, with the end of the side wall away from the bottom wall transitioning to the adjacent plate surface in an arc.

[0011] In some embodiments, in each through-hole group, the distance between the adjacent holes of two second through holes is Db, which satisfies: 0.8mm≤Db≤2mm.

[0012] In some embodiments, the clamp body is further provided with a plurality of third through holes, each of which penetrates both end faces, and the plurality of third through holes and the plurality of first through holes are staggered along the length direction of the connecting edge.

[0013] In some embodiments, the clamping plate further includes a plurality of connecting ribs, each of which corresponds to a plurality of third through holes. Each connecting rib is disposed in the corresponding third through hole and is connected to a portion of the hole wall of the third through hole.

[0014] In some embodiments, the connecting rib divides the corresponding third through hole into multiple sub-through holes, the axes of the multiple sub-through holes being parallel to the axis of the first through hole.

[0015] In some embodiments, along the length of the connecting edge line, each first through hole is connected to an adjacent sub-through hole on both sides.

[0016] In some embodiments, two connecting ribs are provided in the third through hole located in the middle of the clamp body, and the two connecting ribs are arranged sequentially along the length direction of the connecting edge line.

[0017] In some embodiments, the connecting rib has a cross structure, with two ends of the connecting rib connected to the hole wall of the third through hole near one plate surface, and the other two ends of the connecting rib connected to the hole wall of the third through hole near the other plate surface.

[0018] In some embodiments, the second through hole is an oval hole, and the direction of the major diameter of the second through hole is parallel to the length direction of the connecting edge; and / or, the material of the clamp body is plastic.

[0019] Secondly, embodiments of this application provide a battery module, which includes battery cells, connecting bars, module end plates, binding straps, and the aforementioned clamping plates; there are multiple clamping plates and multiple battery cells, and the multiple battery cells and multiple clamping plates are arranged alternately in a direction perpendicular to the plate surface to form a battery cell row, and the two plates of each clamping plate are respectively attached to one battery cell; the connecting bars electrically connect the multiple battery cells; there are two module end plates, and the two module end plates are respectively disposed at both ends of the battery cell row; the binding straps are sleeved on the module end plates and the battery cell row to bind the module end plates and the battery cell row together.

[0020] Thirdly, embodiments of this application provide a battery pack, which includes a base plate, a cover, and the aforementioned battery module; the cover is closed to the base plate; and the battery module is disposed between the base plate and the cover.

[0021] The beneficial effects of the embodiments of this application are as follows:

[0022] In the embodiments of this application, by setting the clamp, airflow can be introduced into the clamp through the first through hole, allowing heat exchange between the airflow and the clamp to manage the temperature of the battery cell. Furthermore, airflow can be directed to the surface of the battery cell through the second through hole, allowing direct contact between the airflow and the battery cell for direct temperature management. This improves the heat exchange efficiency of the battery cell, thereby enhancing the reliability of the battery pack. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the clamp provided in an embodiment of this application;

[0025] Figure 2 This is a side view of the clamp provided in an embodiment of this application;

[0026] Figure 3 This is a partial structural schematic diagram of the clamp provided in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the battery module provided in an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the battery pack structure provided in an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1000 - Battery pack; 10 - Case cover; 20 - Base plate;

[0031] 300 - Battery module; 301 - Battery cell; 302 - Connector bar; 303 - Module end plate; 304 - Binding strap;

[0032] 30-Clamping plate; 31-Clamping plate body; 311-Plate surface; 312-End face; 313-Connecting edge line; 321-First through hole; 322-Third through hole; 3221-Sub-through hole; 33-Second through hole; 34-Buffer groove; 341-Groove bottom wall; 342-Groove side wall; 343-Rounded corner surface;

[0033] 35 - Connecting bar. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, electrical connections, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only the elements expressly listed, but also other elements not expressly listed, or elements inherent to such a product.

[0038] The following combination Figures 1 to 5 The clamping plate 30, battery module 300 and battery pack 1000 provided in the embodiments of this application will be described in detail.

[0039] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the clamping plate 30 provided in an embodiment of this application. Figure 2 This is a side view of a clamping plate 30 provided in an embodiment of this application. In a first aspect, an embodiment of this application provides a clamping plate 30. The clamping plate 30 includes a clamping plate body 31. The clamping plate body 31 has two oppositely disposed end faces 312 and two oppositely disposed plate surfaces 311. The two end faces 312 are located between the two plate surfaces 311 and are connected to both plate surfaces 311. The end faces 312 and plate surfaces 311 are interconnected to define a connecting edge line 313. A plurality of first through holes 321 and a plurality of through hole groups are provided on the clamping plate body 31. The plurality of first through holes 321 are spaced apart along the length of the connecting edge line 313 and penetrate the two end faces 312. The plurality of through hole groups are spaced apart along the length direction of the connecting edge line 313 and correspond one-to-one with the plurality of first through holes 321. Each through hole group includes a plurality of second through holes 33 spaced apart along the axis of the first through holes 321. The second through hole 33 of each through hole group penetrates both of the plate surfaces 311 and the corresponding first through hole 321.

[0040] The length direction of the connecting edge 313 can be the length direction of the battery cell 301, such as... Figure 2 In the first direction shown, the axis of the first through hole 321 is parallel to the axis of the cell 301.

[0041] It is understandable that when the clamping plate 30 is applied to the battery module 300, the two plates 311 of the clamping plate 30 are in contact with a battery cell 301 respectively.

[0042] Specifically, for ease of understanding, the application of the clamping plate 30 to the battery pack 1000 is used as an example. The battery pack 1000 includes a housing assembly with a mounting cavity and a battery module 300 disposed within the housing assembly. The housing assembly is provided with an air inlet and an air outlet, both communicating with the mounting cavity. The base plate 20 of the housing assembly supports the battery module 300, and the base plate 20 is provided with connecting holes, through which the air inlet communicates with the mounting cavity. One end of the clamping plate 30 is attached to the base plate 20, and one end of the first through hole 321 faces the base plate 20 and communicates with some of the connecting holes. When performing temperature management on the battery pack 1000, airflow is delivered into the first through hole 321 through the air inlet and the connecting holes. After the airflow enters the first through hole 321, part of it exchanges heat with the clamping plate 30, and the other part contacts the battery cell 301 through the second through hole 33 for heat exchange. When there is a gap between the battery cell 301 and the through-hole group, the airflow entering the second through-hole 33 can also flow along the gap to the air outlet. Then, the airflow in the mounting cavity is discharged through the air outlet. In this way, the heat of the battery cell 301 is removed by air cooling to manage the temperature of the battery cell 301.

[0043] In this embodiment, by providing the clamping plate 30, airflow can be introduced into the clamping plate 30 through the first through hole 321, allowing heat exchange between the airflow and the clamping plate 30 for temperature management of the battery cell 301. Furthermore, airflow can be directed to the surface of the battery cell 301 through the second through hole 33, allowing direct contact between the airflow and the battery cell 301 for direct temperature management. This improves the heat exchange efficiency of the battery cell 301, thereby enhancing the reliability of the battery pack 1000.

[0044] In addition, the clamping plate 30 is elastic, and when it is applied to the battery module 300, the clamping plate 30 is in a compressed state. Thus, when the battery cell 301 expands due to heat, the deformation recovery force of the clamping plate 30 can offset part of the expansion force of the battery cell 301, thereby effectively suppressing the expansion of the battery cell 301 and helping to ensure the reliability of the electrical connection between the battery cells 301.

[0045] Please see Figure 1 and Figure 2 In some embodiments, a plurality of buffer grooves 34 are provided on the plate surface 311. Each buffer groove 34 corresponds one-to-one with a plurality of through-hole groups. The through-hole groups are disposed on the bottom wall of the corresponding buffer groove 34. Thus, the buffer grooves 34 provide buffer space for the airflow output from the second through-hole 33, allowing more airflow to flow into the buffer grooves 34, thereby enabling the airflow to more fully contact and exchange heat with the battery cell 301. This improves the heat exchange efficiency of the battery cell 301.

[0046] Please see Figure 2 In some embodiments, the depth of the buffer groove 34 is Da, which satisfies: 0.5mm≤Da≤0.8mm.

[0047] It is understood that the depth Da of the buffer groove 34 is, but is not limited to, 0.5mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 0.6mm, 0.61mm, 0.62mm, 0.63mm, 0.64mm, 0.65mm, 0.66mm, 0.67mm, 0.68mm, 0.69mm, 0.7mm, 0.71mm, 0.72mm, 0.73mm, 0.74mm, 0.75mm, 0.76mm, 0.77mm, 0.78mm, 0.79mm, and 0.8mm.

[0048] In this embodiment, by limiting the depth Da of the buffer groove 34, on the one hand, the buffer groove 34 can have a sufficient depth dimension to provide sufficient buffer space for the airflow from the second through hole 33; on the other hand, the depth Db of the buffer groove 34 can be avoided from being too large and affecting the structural strength of the clamping plate 30, so as to ensure the reliability of the clamping plate 30.

[0049] Please see Figure 1 The buffer groove 34 is a through groove extending through the axis of the first through hole 321. In this way, the airflow entering the buffer groove 34 can be discharged through the end of the buffer groove 34, thereby increasing the cross-sectional area of ​​the channel for airflow in the clamping plate 30, which helps to increase the airflow velocity and thus improve the heat exchange efficiency of the cell 301.

[0050] Please see Figure 2 In some embodiments, the inner wall of the buffer groove 34 includes a bottom wall 341 and a side wall 342 connected to each other, with the bottom wall 341 transitioning to the side wall 342 by an arc. This improves the stress state at the connection between the bottom wall 341 and the side wall 342, and avoids stress concentration.

[0051] Please see Figure 2 In some embodiments, the bottom wall 341 of the tank transitions to the side wall 342 of the tank in an arc to form a rounded corner surface 343, the radius of which is 0.4π to 0.6π. This allows the bottom wall 341 to transition to the side wall 342 of the tank more smoothly, thereby reducing stress concentration.

[0052] For example, the radius of the rounded corner 343 is the same as the angle between the bottom wall 341 and the side wall 342 of the groove.

[0053] Please see Figure 2 In some embodiments, the inner wall of the buffer groove 34 includes a bottom wall 341 and a side wall 342 connected to each other, with one end of the side wall 342 away from the bottom wall 341 transitioning to the adjacent plate surface 311 by an arc. This improves the stress state at the connection between the side wall 342 and the plate surface 311, avoiding stress concentration.

[0054] Please see Figure 3 , Figure 3 This is a partial structural schematic diagram of the clamping plate 30 provided in an embodiment of this application. In some embodiments, in each group of through holes, the distance between the adjacent holes of two second through holes 33 is Db, which satisfies: 0.8mm≤Db≤2mm.

[0055] It is understood that the spacing Db between the adjacent second through holes 33 is, but is not limited to, 0.8mm, 0.82mm, 0.84mm, 0.86mm, 0.88mm, 0.9mm, 0.92mm, 0.94mm, 0.96mm, 0.98mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.20mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, and 2mm.

[0056] In this embodiment, by limiting the distance Db between the adjacent holes of two second through holes 33, on the one hand, it can help ensure that the part of the clamp body 31 located between the two adjacent second through holes 33 has sufficient size to ensure the structural strength of this part, thereby improving the reliability of the clamp 30; on the other hand, it can control the distance Db between the adjacent holes of two second through holes 33, so that more second through holes 33 can be arranged on the clamp body 31, so that the airflow and the battery cell 301 have a larger contact area, thereby improving the heat exchange efficiency of the battery cell 301.

[0057] Please see Figure 2 In some embodiments, a plurality of third through holes 322 are also provided on the clamping plate body 31. Each of the plurality of third through holes 322 penetrates both end faces 312. The plurality of third through holes 322 and the plurality of first through holes 321 are staggered along the length of the connecting edge line 313. This increases the flow rate through which the clamping plate 30 guides the airflow from the bottom of the battery cell 301 into the clamping plate 30 and directs the airflow within the clamping plate 30 to the top of the battery cell 301, thereby improving heat exchange efficiency.

[0058] Please see Figure 2 In some embodiments, the clamping plate 30 further includes a plurality of connecting ribs 35. Each connecting rib 35 corresponds one-to-one with a plurality of third through holes 322. Each connecting rib 35 is disposed within a corresponding third through hole 322 and connected to a portion of the hole wall of the third through hole 322. This improves the structural strength of the clamping plate 30, thereby enhancing the structural reliability of the battery pack 1000.

[0059] Please see Figure 2 In some embodiments, the connecting rib 35 divides the corresponding third through hole 322 into multiple sub-through holes 3221. The axes of the multiple sub-through holes 3221 are parallel to the axis of the first through hole 321. In this way, the channel area of ​​the clamping plate 30 for airflow can be increased, and the turbulence in the third through hole 322 can be reduced, thereby improving the smoothness of airflow in the third through hole 322.

[0060] Please see Figure 2 In some embodiments, along the length of the connecting edge 313, each first through hole 321 is connected to an adjacent sub-through hole 3221 on both sides. This increases the channel area of ​​the clamping plate 30 for airflow, thereby increasing the airflow through the clamping plate 30 and improving the heat exchange efficiency of the battery cell 301.

[0061] Please see Figure 1 and Figure 2 In some embodiments, two connecting ribs 35 are provided in the third through hole 322 located in the middle of the clamp body 31, and the two connecting ribs 35 are arranged sequentially along the length direction of the connecting edge line 313.

[0062] For example, there are 9 third through holes 322, which are arranged sequentially along the length of the connecting edge line 313. The third through hole 322 numbered 5 is provided with two connecting ribs 35.

[0063] In this embodiment, the above-mentioned arrangement can enhance the structural strength of the middle part of the clamping plate 30, thereby improving the structural strength of the clamping plate 30 and enabling it to effectively suppress the expansion of the battery cell 301.

[0064] Please see Figure 2 In some embodiments, the connecting rib 35 has a cross-shaped structure. Two ends of the connecting rib 35 are connected to the wall of the third through hole 322 near one plate surface 311. The other two ends of the connecting rib 35 are connected to the wall of the third through hole 322 near the other plate surface 311. In this way, the connecting rib 35 has a simple structure and strong structural strength, which helps to improve the structural strength of the clamping plate 30.

[0065] Please see Figure 3 In some embodiments, the second through hole 33 is an oval hole, and the direction of the major axis of the second through hole 33 is parallel to the length direction of the connecting edge 313. In this way, the second through hole 33 can have a larger cross-sectional area, which is conducive to improving airflow efficiency. At the same time, it can also reduce the number of inflection points of the second through hole 33, which helps to avoid stress concentration and improve the stress state of the clamping plate 30.

[0066] Please see Figure 3 The clamping plate body 31 is made of plastic. As can be understood, plastic has elasticity. In this way, the clamping plate 30 has a certain degree of elasticity, so that when the battery cell 301 expands due to heat, the deformation recovery force of the clamping plate 30 can offset part of the expansion force of the battery cell 301, thereby effectively suppressing the expansion of the battery cell 301. At the same time, it can control the material cost and weight of the clamping plate 30, which is conducive to the lightweighting of the battery pack 1000.

[0067] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a battery module 300 provided in an embodiment of this application. In a second aspect, an embodiment of this application provides a battery module 300. The battery module 300 includes battery cells 301, connecting bars 302, module end plates 303, binding straps 304, and the aforementioned clamping plates 30. Multiple clamping plates 30 and multiple battery cells 301 are provided. Multiple battery cells 301 and multiple clamping plates 30 are sequentially and alternately arranged along a direction perpendicular to the plate surfaces 311 to form a battery cell array. Each clamping plate 30 has two plate surfaces 311 respectively attached to one battery cell 301. The connecting bars 302 electrically connect the multiple battery cells 301. There are two module end plates 303. The two module end plates 303 are respectively disposed at both ends of the battery cell array. The binding straps 304 are sleeved on the module end plates 303 and the battery cell array to bind the module end plates 303 and the battery cell array together.

[0068] It is understandable that cell 301 is a prismatic cell 301.

[0069] It is understandable that the battery cell 301 is connected in series or parallel through the connecting bar 302.

[0070] It is understood that the battery module 300 includes the aforementioned clamping plate 30, and the battery module 300 has all the beneficial effects of the aforementioned clamping plate 30, which will not be repeated here in this embodiment.

[0071] Please see Figure 5 , Figure 5 This is a structural schematic diagram of the battery pack 1000 provided in an embodiment of this application. In a third aspect, an embodiment of this application provides a battery pack 1000. The battery pack 1000 includes a base plate 20, a cover 10, and the aforementioned battery module 300. The cover 10 is closed to the base plate 20. The battery module 300 is disposed between the base plate 20 and the cover 10.

[0072] It is understood that the battery pack 1000 includes the aforementioned battery module 300, and the battery pack 1000 has all the beneficial effects of the aforementioned battery module 300, which will not be repeated here in this embodiment.

[0073] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A splint (30) characterized by, Includes a clamp body (31), the clamp body (31) having two oppositely arranged end faces (312) and two oppositely arranged plate surfaces (311), the two end faces (312) being located between the two plate surfaces (311) and both connecting the two plate surfaces (311), the end faces (312) and plate surfaces (311) being interconnected to define a connecting edge line (313); The clamp body (31) is provided with a plurality of first through holes (321) and a plurality of through hole groups. The plurality of first through holes (321) are spaced apart along the length direction of the connecting edge line (313) and penetrate through the two end faces (312). The plurality of through-hole groups are spaced apart along the length direction of the connecting edge (313) and correspond one-to-one with the plurality of first through holes (321). Each through-hole group includes a plurality of second through holes (33) spaced apart along the axis of the first through hole (321). The second through holes (33) of each through-hole group penetrate both of the plate surfaces (311) and the corresponding first through hole (321).

2. The clamp plate (30) according to claim 1, characterized in that Multiple buffer grooves (34) are provided on the plate surface (311), and the multiple buffer grooves (34) correspond one-to-one with the multiple through hole groups. The through hole groups are provided on the bottom wall of the corresponding buffer groove (34).

3. The clamping plate (30) according to claim 2, characterized in that, The depth of the buffer groove (34) is Da, satisfying: 0.5mm ≤ Da ≤ 0.8mm; and / or, The buffer groove (34) is a through groove that extends through the axis of the first through hole (321).

4. The clamp plate (30) according to claim 2, characterized in that The inner wall of the buffer groove (34) includes a bottom wall (341) and a side wall (342) connected to each other, and the bottom wall (341) transitions to the side wall (342) by an arc.

5. The clamp plate (30) according to claim 4, characterized in that The bottom wall (341) of the groove transitions to the side wall (342) of the groove to form a rounded corner surface (343), the radius of which is 0.4π to 0.6π.

6. A clamp plate (30) according to any one of claims 2-5, characterized in that The inner wall of the buffer groove (34) includes a bottom wall (341) and a side wall (342) connected to each other. The side wall (342) is arc-shaped at one end away from the bottom wall (341) and transitions to the adjacent plate surface (311).

7. The clamp plate (30) according to any one of claims 1-5, characterized in that In each of the through-hole groups, the distance between the adjacent holes of two second through holes (33) is Db, which satisfies: 0.8mm≤Db≤2mm.

8. The clamp plate (30) according to any one of claims 1-5, characterized in that The clamp body (31) is also provided with a plurality of third through holes (322), each of which penetrates the two end faces (312). The plurality of third through holes (322) and the plurality of first through holes (321) are staggered along the length direction of the connecting edge line (313).

9. The clamping plate (30) according to claim 8, characterized in that, The clamp (30) also includes a plurality of connecting ribs (35), which correspond one-to-one with the plurality of third through holes (322). Each connecting rib (35) is disposed in the corresponding third through hole (322) and is connected to a portion of the hole wall of the third through hole (322).

10. The clamp plate (30) according to claim 9, characterized in that The connecting rib (35) divides the corresponding third through hole (322) into multiple sub-through holes (3221), and the axes of the multiple sub-through holes (3221) are parallel to the axis of the first through hole (321).

11. The clamp plate (30) according to claim 10, characterized in that Along the length of the connecting edge (313), each of the first through holes (321) is connected to the adjacent sub-through holes (3221) on both sides.

12. The cleat (30) of claim 9, wherein, Two connecting ribs (35) are provided in the third through hole (322) located in the middle of the clamp body (31), and the two connecting ribs (35) are arranged sequentially along the length direction of the connecting edge line (313).

13. The cleat (30) of claim 9, wherein, The connecting rib (35) has a cross structure. The two ends of the connecting rib (35) are connected to the wall of the third through hole (322) near one of the plate surfaces (311), and the other two ends of the connecting rib (35) are connected to the wall of the third through hole (322) near the other plate surface (311).

14. The cleat (30) of any one of claims 1-5, wherein, The second through hole (33) is an oval hole, and the direction of the major axis of the second through hole (33) is parallel to the length direction of the connecting edge (313); and / or, The material of the clamp body (31) is plastic.

15. A battery module (300) characterized by include: Multiple clamps (30) as described in any one of claims 1-14; Multiple battery cells (301) are arranged alternately with multiple clamping plates (30) in a direction perpendicular to the plate surface (311) to form a battery cell row, and the two plate surfaces (311) of each clamping plate (30) are respectively attached to a battery cell (301); A connecting bar (302) electrically connects multiple of the battery cells (301); Two module end plates (303) are respectively disposed at both ends of the cell array; and A strap (304) is fitted onto the module end plate (303) and the battery cell array to bind the module end plate (303) and the battery cell array together.

16. A battery pack (1000), characterized in that, include: Base plate (20); The lid (10) closes with the base plate (20); as well as The battery module (300) as described in claim 15 is disposed between the base plate (20) and the cover (10).

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