Battery end plate and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery end plate and a battery. The battery end plate comprises an end plate body, a reinforcing piece and a clamping piece, the end plate body comprises two side plates and a bottom plate, the two side plates are oppositely arranged in the width direction of the end plate body and are connected through the bottom plate, an insertion hole is formed between the two side plates, the bottom plate is used for abutting against the end face, provided with a tab, of a pole group, and the insertion hole is used for allowing the tab to penetrate through; at least one of the two side plates is provided with a reinforcing piece, and the reinforcing piece extends in the length direction of the end plate body; the clamping piece clamps the side plates and the reinforcing piece. According to the utility model, the reinforcer is arranged on at least one side plate of the end plate body, the reinforcer extends along the length direction of the end plate body, the reinforcer and the side plate form a whole through the clamping piece, and the strength and rigidity of the side plate are enhanced by the reinforcer, so that the side plate can be prevented from being bent and deformed in the hot melting process of the insulating film, and the service life of the insulating film is prolonged. And normal shell entering of subsequent pole groups is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery end plate and a battery. Background Technology

[0002] Current power battery structures typically house the electrode assembly within a casing. An end plate and a cover plate assembly are located at the casing opening. The cover plate assembly seals the casing, while the end plate is positioned between the cover plate assembly and the electrode assembly, creating a receiving space. The electrode tabs pass through the end plate and are welded to the terminal posts on the cover plate assembly. The electrode tabs are bent and housed within this receiving space. To isolate and protect the electrode assembly, an insulating membrane is provided between the electrode assembly and the inner wall of the casing to prevent short circuits caused by contact between the electrode assembly and the casing.

[0003] In related technologies, before inserting the electrode assembly into the housing during production, an insulating film is fitted onto the outside of the electrode assembly, and the insulating film is heat-fused to the end plate. Then, the electrode assembly, end plate, and insulating film are assembled into a whole and installed into the housing. However, during the heat-fusion process between the insulating film and the end plate, it was found that the end plate is prone to significant bending deformation during heat fusion, causing the sidewalls of the end plate to warp, which affects subsequent housing insertion operations. Utility Model Content

[0004] This utility model provides a battery end plate and a battery to solve the problem that in the existing battery assembly process, the end plate deforms and warps due to the thermal fusion between the end plate and the insulating film, which affects the subsequent casing operation.

[0005] This utility model provides a battery end plate, comprising: an end plate body, including two side plates and a bottom plate, the two side plates being disposed opposite to each other in the width direction of the end plate body and connected by the bottom plate, an insertion hole being formed between the two side plates, the bottom plate being used to abut against the end face of the electrode assembly having a tab, the insertion hole being used for the tab to pass through; a reinforcing member, at least one of the two side plates being provided with the reinforcing member, the reinforcing member being provided to extend along the length direction of the end plate body; and a clamping member for clamping the side plates and the reinforcing member.

[0006] According to the present invention, a battery end plate is provided, wherein the clamping member is provided with a clamping opening, and the reinforcing member and the side plate are engaged in the clamping opening.

[0007] According to the present invention, a battery end plate is provided, wherein the clamping member includes a first limiting part, a second limiting part, an abutting part, a first clamping part, and a second clamping part. The first end of the first limiting part and the first end of the second limiting part are respectively connected to the opposite sides of the abutting part. The first clamping part is disposed at the second end of the first limiting part, and the second clamping part is disposed at the second end of the second clamping part. There is a gap between the first clamping part and the second clamping part to form the clamping opening.

[0008] According to the present invention, the width of the clamping member is greater than or equal to 3mm.

[0009] According to the present invention, a battery end plate is provided, wherein there are multiple clamping members, and the multiple clamping members are spaced apart along the length direction of the end plate body.

[0010] According to the present invention, a battery end plate is provided, wherein the clamping member is an insulating clamping member with an insulation resistance greater than or equal to 1MΩ.

[0011] Alternatively, the reinforcing member may include an insulating reinforcing member or a non-insulating reinforcing member made of the same material as the tab;

[0012] Alternatively, the dimension of the insertion hole in the width direction is S, where 0.5mm ≤ S ≤ 2 / 3W, and W is the width of the end plate body.

[0013] According to the present invention, a battery end plate is provided, the end plate body further includes a guide plate, one of the two side plates is provided with the reinforcing member, and the other is connected to the guide plate. The guide plate is disposed between the two side plates and is inclined in a direction away from the bottom plate. The through hole is formed between the side plate and the guide plate.

[0014] According to the present invention, a battery end plate is provided in which the angle between the guide plate and the plane of the base plate is 0°-75°.

[0015] According to the present invention, a battery end plate includes a base plate comprising a first plate portion and a second plate portion spaced apart along the length of the end plate body. One end of the two side plates is connected through the first plate portion, and the other end is connected through the second plate portion. A clearance groove is provided in the portion of the two side plates located between the first plate portion and the second plate portion. The side of the base plate that abuts against the end face of the electrode assembly is the bottom surface. The distance between the bottom of the clearance groove and the bottom surface is h. Wherein, 0.5mm≤h≤0.5H, and H is the height of the end plate body.

[0016] This utility model also provides a battery, comprising: a housing, an electrode assembly, an insulating film, and a battery end plate as described in any of the above; the housing has a receiving cavity and an opening communicating with the receiving cavity, the electrode assembly is housed in the receiving cavity, the battery end plate is disposed in the opening, the insulating film is disposed between the electrode assembly and the housing, and the insulating film is at least fixedly connected to the side plate.

[0017] The battery end plate and battery provided by this utility model have a reinforcing member provided on at least one side plate of the end plate body. The reinforcing member extends along the length direction of the end plate body and is integrated with the side plate by a clamping member. The reinforcing member enhances the strength and rigidity of the side plate and can prevent the side plate from bending and deforming during the heat fusion process with the insulating film, thus ensuring the normal insertion of the subsequent electrode assembly. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an exploded view of the battery end plate provided by this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of the battery end plate provided by this utility model.

[0021] Figure 3 This is a top view of the battery end plate provided by this utility model.

[0022] Figure 4 This is a schematic diagram of the clamping component provided by this utility model.

[0023] Figure 5 yes Figure 3 Cross-sectional view at point AA.

[0024] Figure 6 This is a partial cross-sectional view of the battery provided by this utility model.

[0025] Figure label:

[0026] 1. End plate body; 11. Side plate; 111. Clearance groove; 12. Connecting plate; 13. Base plate; 131. First plate part; 132. Second plate part; 14. Through hole; 15. Guide plate; 2. Reinforcing member; 3. Housing; 4. Electrode assembly; 41. End face; 42. Electrode ear; 5. Insulating film; 6. Clearance gap; 7. Cover plate assembly; 8. Clamping member; 81. First limiting part; 82. Second limiting part; 83. Abutting part; 84. First clamping part; 85. Second clamping part. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0029] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0030] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0032] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0033] The following is combined with Figures 1-6 This invention describes the battery end plate and battery.

[0034] like Figures 1 to 5 As shown, the battery end plate provided in this embodiment of the present invention includes an end plate body 1, a reinforcing member 2, and a clamping member 8. The end plate body 1 includes two side plates 11 and a bottom plate 13. The two side plates 11 are arranged opposite to each other in the width direction of the end plate body 1 and connected by the bottom plate 13. An insertion hole 14 is formed between the two side plates 11, and the bottom plate 13 is used to abut against the end face 41 of the electrode assembly 4 where the electrode tab 42 is provided, and the insertion hole 14 is used for the electrode tab 42 to pass through. At least one of the two side plates 11 is provided with a reinforcing member 2, which extends along the length direction of the end plate body 1. The clamping member 8 is used to clamp the side plate 11 and the reinforcing member 2.

[0035] like Figure 1 and Figure 2 As shown, two side plates 11 are spaced apart across the width of the end plate body 1. The side plates 11 extend along the length direction of the end plate body 1, and the direction perpendicular to the bottom plate 13 is the height direction of the end plate body 1. The side plate 11 is a long strip-shaped plate extending along the length direction of the end plate body 1, and the length direction of the side plate 11 is consistent with the length direction of the end plate body 1. The width direction of the side plate 11 is consistent with the height direction of the end plate body 1. The through hole 14 is a strip-shaped hole formed between the two side plates 11. Its dimension in the length direction of the end plate body 1 is larger than the width of the electrode tab 42, so that the electrode tab 42 can pass through it.

[0036] like Figure 1 and Figure 3 As shown, the end plate body 1 also includes a connecting plate 12. The two connecting plates 12 are arranged opposite each other in the length direction of the end plate body 1. The two side plates 11 and the two connecting plates 12 surround and form the entire annular sidewall of the end plate body 1. The bottom plate 13 is connected to one end of the annular sidewall.

[0037] Before the casing process, the bottom plate 13 of the battery end plate is abutted against the end face 41 of the electrode assembly 4, where the tabs 42 are located, and the tabs 42 on the end face 41 are inserted through the insertion hole 14. The insulating film 5 is then heat-fused to the side wall of the end plate body 1. The side plate 11 can be welded to the insulating film 5 at multiple points. The reinforcing member 2 on the side plate 11 prevents bending deformation during the heat fusion process between the side plate 11 and the insulating film 5. Furthermore, two connecting plates 12 can also be welded to the insulating film 5. The connecting plates 12 are small in size and less prone to heat fusion deformation.

[0038] At least one of the two side plates 11 is provided with a reinforcing member 2, which extends along the length direction of the end plate body 1, that is, the reinforcing member 2 extends along the length direction of the side plate 11, thereby enhancing the strength and rigidity of the side plate 11. It should be noted that the length of the reinforcing member 2 may be less than or equal to the length of the side plate 11, and preferably the length of the reinforcing member 2 is equivalent to the length of the side plate 11.

[0039] The clamping member 8 is used to clamp the side plate 11 and the reinforcing member 2. In one embodiment, the clamping member 8 is a fixing clamp with an adjustable opening. When a force is applied to the fixing clamp, the opening opens, allowing the reinforcing member 2 and the side plate 11 to be located within the opening. The two inner wall surfaces of the opening, facing each other, abut against the wall surface of the reinforcing member 2 away from the side plate 11 and the wall surface of the side plate 11 away from the reinforcing member 2, respectively. In another embodiment, the clamping member 8 is a U-shaped member. The reinforcing member 2 and the side plate 11 are engaged at the U-shaped opening. The wall surface of the reinforcing member 2 away from the side plate 11 and the wall surface of the side plate 11 away from the reinforcing member 2, respectively, abut against the two opposing inner wall surfaces of the U-shaped member. In yet another embodiment, the clamping member 8 includes a magnetic element and a magnetic adsorption element. One of the reinforcing member 2 and the side plate 11 is provided with a magnetic element, and the other is provided with a magnetic adsorption element. The two are connected by magnetic adsorption.

[0040] The battery end plate provided in this embodiment of the utility model has a reinforcing member 2 provided on at least one side plate 11 of the end plate body 1. The reinforcing member 2 extends along the length direction of the end plate body 1. The reinforcing member 2 and the side plate 11 are integrated by the clamping member 8. The reinforcing member 2 enhances the strength and rigidity of the side plate 11, which can prevent the side plate 11 from bending and deforming during the hot melting process with the insulating film 5, and ensure the normal insertion of the subsequent electrode assembly 4 into the casing.

[0041] In one embodiment, the clamping member 8 has a clamping opening, and the reinforcing member 2 and the side plate 11 are engaged in the clamping opening. Specifically, the clamping member 8 has a clamping opening, the size of which matches the sum of the thickness of the reinforcing member 2 and the thickness of the side plate 11. The reinforcing member 2 and the side plate 11 are inserted into the clamping opening, thereby forming a whole with the reinforcing member 2 and the side plate 11. In one embodiment, the clamping member 8 is a U-shaped clamping member.

[0042] In some embodiments of this utility model, such as Figure 4 As shown, the clamping member includes a first limiting part 81, a second limiting part 82, an abutting part 83, a first clamping part 84, and a second clamping part 85. The first end of the first limiting part 81 and the first end of the second limiting part 82 are respectively connected to the opposite sides of the abutting part 83. The first clamping part 84 is disposed at the second end of the first limiting part 81, and the second clamping part 85 is disposed at the second end of the second clamping part 85. There is a gap between the first clamping part 84 and the second clamping part 85 to form a clamping opening. Under the action of external force, the first clamping part 84 and the second clamping part 85 can move away from each other or return to their original position.

[0043] During the actual clamping process, an external force is applied to the first clamping part 84 and the second clamping part 85, increasing the distance between them, i.e., increasing the size of the clamping opening. This facilitates the insertion of the reinforcing member 2 and the side plate 11 into the clamping opening. After insertion, the external force is released. One of the inner wall surfaces of the first clamping part 84 and the second clamping part 85 abuts against the side of the reinforcing member 2 away from the side plate 11, and the other abuts against the side of the side plate 11 away from the reinforcing member 2. The top surfaces of both the side plate 11 and the reinforcing member 2 abut against the abutting part 83. When it is necessary to separate the reinforcing member 2 from the side plate 11, opposite forces are applied to the first clamping part 84 and the second clamping part 85, with an upward force applied simultaneously, thereby separating the reinforcing member 2 from the side plate 11 and the clamping member 8. This embodiment of the invention connects the reinforcing member 2 and the side plate 11 through the clamping member 8, providing good stability and facilitating user installation and disassembly.

[0044] In some embodiments of this utility model, the width of the clamping member 8 is greater than or equal to 3mm, such as 3mm, 4mm, 6mm, 8mm, 9mm, 9.5mm, etc. It should be noted that the width direction of the clamping member 8 is consistent with the length direction of the end plate body 1, that is, consistent with the length direction of the reinforcing member 2. It can be understood that the maximum width of the clamping member 8 is roughly equivalent to the length of the reinforcing member 2. In actual use, the width is set according to the actual dimensions of the reinforcing member 2.

[0045] In one embodiment, there is one clamping member 8, which can be located at the middle of the length of the reinforcing member 2 to improve stability. The width of the clamping member 8 is greater than or equal to 3 mm. In another embodiment, the width of the clamping member 8 is the same as the length of the reinforcing member 2.

[0046] In some embodiments of this utility model, there are multiple clamping members 8, such as 2, 3, 5, 6, etc. The multiple clamping members 8 are spaced apart along the length direction of the end plate body 1. Figure 1 and Figure 2 As shown, there are two clamping parts 8, which are respectively located on both sides of the length of the reinforcing part 2, and have good stability.

[0047] Furthermore, multiple clamping members 8 are evenly distributed along the length of the end plate body 1, making the whole formed by the reinforcing member 2 and the side plate 11 more stable.

[0048] It should be noted that the number and width of the clamping parts 8 are not specifically limited, but are set according to the length of the reinforcing part 2 to ensure the overall stability of the reinforcing part 2 and the side plate 11.

[0049] In some embodiments of this invention, the clamping member 8 is an insulating clamping member to prevent short circuits when it comes into contact with the electrode tab 42. The insulation resistance of the insulating clamping member is greater than or equal to 1MΩ, such as 1MΩ, 2MΩ, 4MΩ, 5MΩ, etc.

[0050] The reinforcing member 2 in this embodiment of the invention should not react with the electrolyte. The reinforcing member 2 can be an insulating reinforcing member 2 to prevent short circuits when it comes into contact with the tab 42. The reinforcing member 2 can also be a non-insulating reinforcing member 2 made of the same material as the tab 42, such as an aluminum plate or a copper plate. The reinforcing member 2 can also be a ceramic reinforcing member 2 or a plastic reinforcing member 2.

[0051] like Figure 5 and Figure 6 As shown, in some embodiments of the present invention, the end plate body 1 further includes a guide plate 15, one of the two side plates 11 is provided with a reinforcing member 2, and the other is connected to the guide plate 15. The guide plate 15 is disposed between the two side plates 11 and is inclined in a direction away from the bottom plate 13. The through hole 14 is formed between the side plate 11 and the guide plate 15.

[0052] Specifically, the two side plates 11 are a first side plate and a second side plate, respectively. The first side plate has a reinforcing member 2, and the second side plate is connected to a guide plate 15. It is understood that the side of the guide plate 15 away from the second side plate defines an insertion hole 14 between it and the first side plate. The side of the guide plate 15 facing the base plate 13 forms a first guide surface extending from the second side plate towards the insertion hole 14. During the assembly of the tab 42 and the battery end plate, when the tab 42 is passed through the insertion hole 14, the first guide surface guides the tab 42 through the insertion hole 14, enabling rapid insertion and improving assembly efficiency. Simultaneously, the guide plate 15 also serves as a reinforcing member 2 on the second side plate, strengthening it.

[0053] Among them, the guide plate 15 has a second guide surface parallel to the first guide surface on the side away from the base plate 13, see [reference]. Figure 5 A receiving groove is formed between the second guide surface and the second side plate. After the electrode tab 42 passes through the insertion hole 14, it is bent and received in the receiving groove. With the guidance of the second guide surface, the electrode tab 42 is reliably received in the receiving groove, preventing the electrode tab 42 from contacting the electrode group 4 and causing a short circuit.

[0054] like Figure 5 As shown in the embodiment of this utility model, the angle α between the plane containing the guide plate 15 and the base plate 13 is 0°-75°. Specifically, the base plate 13 is a flat plate with a first side and a second side facing away from each other. Two side plates 11 protrude from the first side, and the second side of the base plate 13 forms the bottom surface of the end plate body 1. The base plate 13 abuts against the end face 41 of the pole assembly 4 through this bottom surface. The angle between the guide plate 15 and the bottom surface is 0°-75°.

[0055] Optionally, the α angle can be 30°, 45°, 55°, 60°, or 75°. If the α angle is too small, it will not be able to guide the tab 42, causing the tab 42 to be inserted backwards into the electrode group 4, resulting in a short circuit. If the α angle is too large, it will make it difficult to form the end plate body 1, increasing the processing difficulty.

[0056] Further, see Figure 5 The dimension S of the through hole 14 in the width direction of the end plate body 1 is S, 0.5mm≤S≤2 / 3W, such as S is 0.5mm, 1mm, etc.; W is the width of the end plate body 1.

[0057] Specifically, the two side plates 11 are arranged in parallel and perpendicular to the bottom plate 13. The width W of the end plate body 1 is the distance between the two side plates 11 on their opposite sides. The width of the through hole 14 is consistent with the width direction of the end plate body 1. It should be noted that when the reinforcing member 2 protrudes from the inner side of the first side plate and the second side plate is connected to the guide plate 15, the through hole 14 is defined between the reinforcing member 2 and the guide plate 15, and the width of the through hole 14 is determined by the distance between the reinforcing member 2 and the guide plate 15 in the width direction of the end plate body 1.

[0058] As shown in Table 1, experiments were conducted on the electrode tab 4 passing through the end plate body 1 under different dimensions W and S. When W is 12.6 mm, 0.5 mm ≤ S ≤ 8.4 mm, the electrode tab 42 can pass through the end plate body 1, the assembly yield of the end plate body 1 and the electrode assembly 4 is ≥ 99%, and CT scan shows that the electrode tab 42 has a good folded shape.

[0059] Table 1: Experimental results of the tabs passing through the endplate body under different sizes W and S.

[0060]

[0061] Further experiments revealed that within the range of 10mm ≤ W ≤ 40mm, the same experimental results could be obtained by setting 0.5mm ≤ S ≤ 2 / 3W. For example, when W is 10mm, the range of S is 0.5mm to 6.66mm. When W is 20mm, the range of S is 0.5mm to 13.3mm. When W is 40mm, the range of S is 0.5mm to 26.66mm.

[0062] like Figure 2 and Figure 5 As shown, in some embodiments of this utility model, the base plate 13 includes a first plate portion 131 and a second plate portion 132 spaced apart along the length of the end plate body 1. One end of the two side plates 11 is connected through the first plate portion 131, and the other end is connected through the second plate portion 132. The portion of the two side plates 11 located between the first plate portion 131 and the second plate portion 132 is provided with a relief groove 111; the side of the base plate 13 that abuts against the end face 41 of the pole assembly 4 is the bottom surface, and the distance between the bottom of the relief groove 111 and the bottom surface is h, where 0.5mm≤h≤0.5H, e.g., 0.5mm; H is the height of the end plate body 1.

[0063] Specifically, one side plate 11 is connected to one side of the first plate portion 131 and the second plate portion 132 at both ends along the length of the end plate body 1, and the other side plate 11 is connected to the other side of the first plate portion 131 and the second plate portion 132 at both ends along the length of the end plate body 1. Both the first plate portion 131 and the second plate portion 132 are used to abut against the end face 41 of the pole assembly 4 where the pole lug 42 is located. When the base plate 13 abuts against the end face 41 of the pole assembly 4, the first plate portion 131 and the second plate portion 132 are located on both sides of the pole lug 42 to ensure that the base plate 13 abuts against the end face 41 of the pole assembly 4 while preventing the base plate 13 from pressing against the pole lug 42. It should be noted that the first plate portion 131 and the second plate portion 132 are located inside the two connecting plates 12.

[0064] Optionally, the dimension K of the insertion hole 14 in the length direction of the end plate body 1 is greater than or equal to L+2mm, where L is the width of the tab 42. If K is too small, it will cause interference between the tab 42 and the end plate body 1, and the tab 42 will be easily damaged when it is inserted.

[0065] Optionally, the reinforcing member 2 is disposed on the side plate 11 in the region between the first plate portion 131 and the second plate portion 132, that is, the reinforcing member 2 extends from the first plate portion 131 to the second plate portion 132 to enhance the strength and rigidity of this region. Optionally, the reinforcing member 2 is a plate-shaped member, and its thickness direction is consistent with the thickness direction of the side plate 11. Further, the end of the first plate portion 131 away from the second plate portion 132 is connected to a connecting plate 12, and the end of the second plate portion 132 away from the first plate portion 131 is connected to another connecting plate 12.

[0066] The side plate 11 is perpendicular to the base plate 13. A clearance groove 111 is provided on the side of the side plate 11 closest to the base plate 13, located between the first plate portion 131 and the second plate portion 132 of the base plate 13. Thus, when the base plate 13 abuts against the end face 41 of the electrode assembly 4, a clearance gap 6 is formed between the clearance groove 111 and the end face 41 of the electrode assembly 4. The width of the clearance gap 6 is the distance between the bottom of the clearance groove 111 and the bottom surface. By setting a clearance gap 6 of 0.5mm to 0.5H, this invention can prevent the side plate 11 from damaging the electrode tab 42 and ensure that the electrode tab 42 will not protrude through the gap, causing the electrode tab 42 to contact the housing 3 and short-circuit.

[0067] As shown in Table 2, experiments were conducted on the electrode tab 4 passing through the end plate body 1 under different dimensions H and h. When H is 6 mm, 0.5 mm ≤ S ≤ 3 mm, the electrode tab 42 can pass through the end plate body 1, the assembly yield of the end plate body 1 and the electrode assembly 4 is ≥ 99%, and CT detection shows that the electrode tab 42 has a good folded shape.

[0068] Table 2: Experimental results of the tabs passing through the endplate body under different sizes H and h.

[0069]

[0070] Further experiments revealed that within the range of 4mm ≤ H ≤ 10mm, the same experimental results could be obtained by setting 0.5mm ≤ h ≤ 0.5H. For example, when H is 4mm, the value of h ranges from 0.5mm to 2mm. When H is 6mm, the value of h ranges from 0.5mm to 3mm. When H is 8mm, the value of h ranges from 0.5mm to 4mm. When H is 10mm, the value of h ranges from 0.5mm to 5mm.

[0071] like Figure 6 As shown, this embodiment of the present invention also provides a battery, including a housing 3, an electrode assembly 4, an insulating film 5, and a battery end plate as described in any of the above embodiments. The housing 3 has a receiving cavity and an opening communicating with the receiving cavity. The electrode assembly 4 is housed within the receiving cavity, and the battery end plate is disposed in the opening. The insulating film 5 is disposed between the electrode assembly 4 and the housing 3, and the insulating film 5 is at least fixedly connected to a side plate 11 provided with a reinforcing member 2.

[0072] The battery also includes a cover plate assembly 7, which is disposed in the opening. The battery end plate is located between the cover plate assembly 7 and the electrode group 4, and the electrode tab 42 is electrically connected to the electrode post on the cover plate assembly 7. Optionally, one of the two side plates 11 is provided with a reinforcing member 2, and the other is connected with a guide plate 15, so that both side plates 11 can be thermally welded to the insulating film 5.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery end plate, characterized by, include: The end plate body includes two side plates and a bottom plate. The two side plates are arranged opposite to each other in the width direction of the end plate body and connected by the bottom plate. An insertion hole is formed between the two side plates. The bottom plate is used to abut against the end face of the electrode assembly with an electrode tab. The insertion hole is used for the electrode tab to pass through. A reinforcing member is provided in at least one of the two side plates, and the reinforcing member extends along the length direction of the end plate body; Clamping member for clamping the side plate and the reinforcing member.

2. The battery end plate of claim 1, wherein, The clamping member is provided with a clamping opening, and the reinforcing member and the side plate are engaged in the clamping opening.

3. The battery end plate of claim 2, wherein, The clamping member includes a first limiting part, a second limiting part, an abutting part, a first clamping part, and a second clamping part. The first end of the first limiting part and the first end of the second limiting part are respectively connected to the opposite sides of the abutting part. The first clamping part is disposed at the second end of the first limiting part, and the second clamping part is disposed at the second end of the second clamping part. There is a gap between the first clamping part and the second clamping part to form the clamping opening.

4. The battery end plate of claim 1, wherein, The width of the clamping member is greater than or equal to 3 mm.

5. The battery end plate of claim 1, wherein, There are multiple clamping members, and the multiple clamping members are spaced apart along the length direction of the end plate body.

6. The battery end plate of claim 1, wherein, The clamping component is an insulating clamping component with an insulation resistance greater than or equal to 1MΩ; Alternatively, the reinforcing member may include an insulating reinforcing member or a non-insulating reinforcing member made of the same material as the tab; Alternatively, the dimension of the insertion hole in the width direction is S, where 0.5mm≤S≤2 / 3W, and W is the width of the end plate body.

7. The battery end plate of any one of claims 1 to 6, wherein, The end plate body also includes a guide plate. One of the two side plates is provided with the reinforcing member, and the other is connected to the guide plate. The guide plate is located between the two side plates and is inclined in a direction away from the bottom plate. The through hole is formed between the side plate and the guide plate.

8. The battery end plate of claim 7, wherein, The angle between the guide plate and the plane containing the base plate is 0°-75°.

9. The battery end plate of claim 1, wherein, The base plate includes a first plate portion and a second plate portion that are spaced apart along the length of the end plate body, and one end of the two side plates are connected through the first plate portion and the other end is connected through the second plate portion. The two side plates are provided with clearance grooves in the portions between the first plate portions and the second plate portions. The side of the bottom plate that abuts against the end face of the pole group is the bottom surface. The distance between the bottom of the clearance groove and the bottom surface is h. Wherein, 0.5mm≤h≤0.5H, and H is the height of the end plate body.

10. A battery, characterized by include: The housing, electrode assembly, insulating film, and battery end plate as described in any one of claims 1-9; The housing has a receiving cavity and an opening communicating with the receiving cavity. The electrode assembly is housed in the receiving cavity. The battery end plate is disposed in the opening. The insulating film is disposed between the electrode assembly and the housing. The insulating film is at least fixedly connected to the side plate.

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