Battery end plate and battery

Abstract

The present invention 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, the end plate body comprises 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, and the insertion hole is formed in the end plate body; the bottom plate is used for abutting against the end face, provided with a tab, of a pole group, and the tab penetrates through the penetrating hole; at least one side plate is provided with a body part and a reinforcing rib arranged on the body part in a protruding mode, and the reinforcing rib extends in the length direction of the end plate body. According to the battery end plate and the battery, the reinforcing ribs are arranged on at least one side plate of the end plate body, the reinforcing ribs extend in the length direction of the end plate body, the strength and rigidity of the side plates are enhanced through the reinforcing ribs, bending deformation of the side plates in the hot melting process of the side plates and an insulating film can be prevented, and it is guaranteed that a follow-up electrode group normally enters a shell.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery end plate and a battery. Background Art

[0002] Current power battery structures typically place the electrode assembly within a housing. The housing's opening is fitted with an end plate and cover assembly. The cover assembly seals the housing, with the end plate positioned between the cover assembly and the electrode assembly. The electrode lugs extend through the end plate and are welded to the electrode posts on the cover assembly. To isolate and protect the electrode assembly, an insulating film is required between the electrode assembly and the inner wall of the housing to prevent contact between the electrode assembly and the housing, which could cause a short circuit.

[0003] In the prior art, during assembly, an insulating film is first applied to the outside of the electrode assembly and then heat-sealed to the end plates. The electrode assembly, end plates, and insulating film are then assembled and installed into the housing. However, during the heat-sealing process, the end plates were found to be susceptible to significant bending deformation, causing the side panels of the end plates to warp, hindering subsequent installation into the housing. Summary of the Invention

[0004] The present invention provides a battery end plate and a battery, which are used to solve the problem that in the assembly process of the existing battery, the end plate is deformed and warped due to the thermal fusion of the end plate and the insulating film, which affects the subsequent shell insertion operation.

[0005] The present invention provides a battery end plate, comprising: The end plate body includes a side plate and a bottom plate, the two side plates are arranged opposite to each other in the width direction of the end plate body and are 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 surface of the pole group with the pole ear, and the insertion hole is used for the pole ear to pass through; at least one of the side plates has a main body and a reinforcing rib protruding from the main body, and the reinforcing rib extends along the length direction of the end plate body.

[0006] According to a battery end plate provided by the present invention, the reinforcing rib is protruding from a side of the main body portion close to the other side plate.

[0007] According to a battery end plate provided by the present invention, the reinforcing rib is connected to the main body portion in an arc transition manner on a side close to the bottom plate in the height direction of the end plate body.

[0008] According to a battery end plate provided by the present invention, the reinforcing rib is provided as an inclined surface on a side close to the bottom plate in the height direction of the end plate body, and the inclined surface is inclined from the body portion toward a direction away from the bottom plate.

[0009] According to a battery end plate provided by the present invention, the inclined surface is inclined from an edge of a side of the main body close to the bottom plate toward a direction away from the bottom plate.

[0010] According to a battery end plate provided by the present invention, the end plate body also includes a guide plate, one of the two side plates has the main body and the reinforcing ribs, and the other is connected to the guide plate; the guide plate is located between the two side plates and is inclined away from the bottom plate, and the through hole is formed between the guide plate and the side plate opposite thereto.

[0011] According to a battery end plate provided by the present invention, the angle between the guide plate and the plane where the bottom plate is located is 0°~75°.

[0012] According to a battery end plate provided by the present invention, the dimension of the through hole in the width direction is S, 0.5 mm ≤ S ≤ 2 / 3 W, and W is the width of the end plate body.

[0013] According to a battery end plate provided by the present invention, the bottom plate includes a first plate portion and a second plate portion spaced apart in the longitudinal direction, one end of the two side plates is connected by the first plate portion, and the other end is connected by the second plate portion; the through hole is formed between the two side plates, the first plate portion, and the second plate portion; The portion of the side plate located between the first plate portion and the second plate portion is provided with an avoidance groove, the side of the bottom plate that abuts against the end face is the bottom face of the end plate body, and the distance between the bottom of the avoidance groove and the bottom face is h; wherein, 0.5mm≤h≤0.5H, H is the height of the end plate body.

[0014] The present invention also provides a battery, comprising: a shell, an electrode group, an insulating film and any one of the above-mentioned battery end plates; The shell is provided with a accommodating cavity and an opening connected to the accommodating cavity, the electrode group is accommodated in the accommodating cavity, the battery end plate is arranged at the opening, the insulating film is arranged between the electrode group and the shell, and the insulating film is fixedly connected to at least the side plate having the reinforcing rib.

[0015] The battery end plate and battery provided by the present invention are characterized by providing reinforcing ribs on at least one side plate of the end plate body, wherein the reinforcing ribs extend along the length direction of the end plate body. The reinforcing ribs are utilized to enhance the strength and rigidity of the side plate, thereby preventing the side plate from bending and deforming during the hot-melt process with the insulating film, thereby ensuring the normal insertion of the subsequent electrode group into the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the battery end plate provided by the present invention.

[0018] Figure 2 It is a structural schematic diagram of the battery end plate provided by the present invention from another perspective.

[0019] Figure 3 It is a top view of the battery end plate provided by the present invention.

[0020] Figure 4 yes Figure 3 Cross-sectional view of the battery end plate at AA.

[0021] Figure 5 It is a schematic diagram of another embodiment of the reinforcing ribs in the battery end plate provided by the present invention.

[0022] Figure 6 It is a schematic diagram of another embodiment of the reinforcing ribs in the battery end plate provided by the present invention.

[0023] Figure 7 It is a side view of the battery end plate provided by the present invention.

[0024] Figure 8 It is a partial cross-sectional view of the battery provided by the present invention.

[0025] Reference numerals: 1. End plate body; 11. Side plate; 111. Main body; 112. Reinforcement rib; 1121. Inclined surface; 113. Avoidance groove; 12. First connecting plate; 13. Bottom plate; 131. First plate portion; 132. Second plate portion; 14. Through hole; 15. Guide plate; 16. Second connecting plate; 3. Shell; 4. Pole group; 41. End face; 42. Pole ear; 5. Insulating film; 6. Avoidance gap; 7. Cover plate assembly. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are for the purpose of clearly describing the numbering of product components and do not represent any substantial difference. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more. "And / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0028] The following combination Figures 1-8 The battery end plates and batteries of the present invention are described.

[0029] like Figure 1 、 Figure 2 and Figure 8 As shown, the battery end plate provided by the embodiment of the present invention includes an end plate body 1. The end plate body 1 includes a side plate 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 are connected by the bottom plate 13. An insertion hole 14 is formed between the two side plates 11. The bottom plate 13 is used to abut against the end surface 41 of the pole group 4 on which the pole lug 42 is provided, and the insertion hole 14 is used for the pole lug 42 to pass through. At least one side plate 11 has a main body 111 and a reinforcing rib 112 protruding from the main body 111, and the reinforcing rib 112 is extended along the length direction of the end plate body 1.

[0030] The two side panels 11 are spaced apart across the width of the end plate body 1. The side panels 11 extend along the length of the end plate body 1, with the direction perpendicular to the bottom panel 13 being the height direction of the end plate body 1. The side panels 11 are long, strip-shaped members extending along the length of the end plate body 1. The length of the side panels 11 coincides with the length of the end plate body 1, and the width of the side panels 11 coincides with the height of the end plate body 1. The insertion hole 14 is a strip-shaped hole formed between the two side panels 11. Its dimension along the length of the end plate body 1 is greater than the width of the tab 42, allowing the tab 42 to pass through it.

[0031] Furthermore, the end plate body 1 also includes a first connecting plate 12, and the two first connecting plates 12 are arranged opposite to each other in the length direction of the end plate body 1. The two side plates 11 and the two first connecting plates 12 surround and form the entire annular side wall of the end plate body 1, and the bottom plate 13 is connected to one end of the annular side wall.

[0032] Before inserting the battery into the housing, the base plate 13 of the battery end plate is aligned with the end face 41 of the electrode assembly 4. The electrode tabs 42 on the end face 41 are inserted into the insertion holes 14. The insulating film 5 is then heat-welded to the sidewall of the end plate body 1. The side plate 11, equipped with reinforcing ribs 112, can be welded to the insulating film 5 at multiple points. Furthermore, two first connecting plates 12 can be welded to the insulating film 5. The first connecting plates 12 are relatively small and less susceptible to heat-melting deformation.

[0033] The side panels 11 are provided with protruding reinforcing ribs 112, which extend along the length of the end panel body 1. That is, the reinforcing ribs 112 extend along the length of the side panels 11, thereby enhancing the strength and rigidity of the side panels 11. It is understood that the reinforcing ribs 112 are integrally formed with the body 111 to form the side panels 11, and are formed during the injection molding process of the end panel body 1.

[0034] The battery end plate provided in an embodiment of the present invention has a reinforcing rib 112 provided on at least one side plate 11 of the end plate body 1. The reinforcing rib 112 extends along the length direction of the end plate body 1. The reinforcing rib 112 is utilized to enhance the strength and rigidity of the side plate 11, thereby preventing the side plate 11 from bending and deforming during the hot-melt process with the insulating film 5, thereby ensuring the normal insertion of the subsequent electrode group 4 into the shell.

[0035] Alternatively, as Figure 2 and Figure 3 As shown, the bottom 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. The two side plates 11 are connected at one end by the first plate portion 131 and at the other end by the second plate portion 132. A through hole 14 is formed between the two side plates 11, the first plate portion 131, and the second plate portion 132.

[0036] 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. The first plate portion 131 and the second plate portion 132 are both used to abut against the end face 41. When the bottom plate 13 abuts against the end face 41 of the electrode group 4, the first plate portion 131 and the second plate portion 132 are located on both sides of the electrode tab 42 to ensure that the bottom plate 13 abuts against the end face 41 of the electrode group 4 while preventing the bottom plate 13 from pressing against the electrode tab 42.

[0037] Optionally, the dimension of the insertion hole 14 in the longitudinal direction of the end plate body 1 is K≥L+2mm, where L is the width of the tab 42. If K is too small, the tab 42 may interfere with the end plate body 1 and may be damaged when the tab 42 is inserted.

[0038] Further, such as Figure 1As shown, the side of the first plate portion 131 near the second plate portion 132 is connected to the two side panels 11 via a second connecting plate 16, and the side of the second plate portion 132 near the first plate portion 131 is connected to the two side panels 11 via another second connecting plate 16. Reinforcing ribs 112 are provided between the two second connecting plates 16 to enhance the strength and rigidity of the corresponding areas on the side panels 11. Of course, the length of the reinforcing ribs 112 can also be greater than the distance between the two second connecting plates 16, or equivalent to the length of the side panels 11.

[0039] Furthermore, one end of the first plate portion 131 away from the second plate portion 132 is connected to one first connecting plate 12 , and one end of the second plate portion 132 away from the first plate portion 131 is connected to another first connecting plate 12 .

[0040] The sides of the two side panels 11 that are close to each other are defined as the inner sides of the side panels 11, and the sides that are away from each other are defined as the outer sides of the side panels 11. In the embodiment of the present invention, the reinforcing ribs 112 can be provided on the inner sides of the side panels 11, that is, the reinforcing ribs 112 are provided on the side of the main body 111 that is close to the other side panel 11, see Figure 4 Alternatively, the reinforcing rib 112 is provided on the outer side of the side plate 11, that is, the reinforcing rib 112 is protruded on the side of the main body 111 away from the other side plate 11. Alternatively, the reinforcing rib 112 is provided on both the inner side and the outer side of the reinforcing rib 112.

[0041] The cross-sectional shape of the reinforcing rib 112 in the width direction of the end plate body 1 may be a rectangle, a semicircle, or the like, without limitation.

[0042] In some embodiments of the present invention, the reinforcing rib 112 is connected to the main body 111 in a circular arc transition on the side closest to the bottom plate 13 in the height direction of the end plate body 1. In other words, the side surface of the reinforcing rib 112 close to the end surface 41 is connected to the side surface of the main body 111 in a circular arc transition, with the arc transition surface facing the end surface 41. In this way, when the tab 42 is inserted through the insertion hole 14, the arc transition surface can prevent the tab 42 from being stuck in the angle formed by the reinforcing rib 112 and the main body 111.

[0043] Optionally, the radius of the arc transition is greater than or equal to the height of the reinforcing rib 112 relative to the main body 111, which can better guide the tab 42. During the process of inserting the tab 42, the arc transition surface can guide the tab 42 to the insertion hole 14, which is conducive to rapid insertion and improved assembly efficiency.

[0044] like Figure 5As shown, in some embodiments of the present invention, the side of the reinforcing rib 112 near the bottom plate 13 in the height direction of the end plate body 1 is provided with an inclined surface 1121. The inclined surface 1121 is arranged to be inclined from the main body 111 in a direction away from the bottom plate 13. It is understood that the inclined surface 1121 is connected between the side of the reinforcing rib 112 away from the main body 111 and the side of the main body 111 facing the reinforcing rib 112. During the process of inserting the tab 42, the inclined surface 1121 also serves as a guide for the insertion of the tab 42.

[0045] Furthermore, if Figure 6 As shown, the inclined surface 1121 is arranged to be inclined from the side edge of the main body 111 close to the bottom plate 13 toward the direction away from the bottom plate 13. It is understood that the side of the reinforcing rib 112 close to the bottom plate 13 in the height direction of the end plate body 1 is flush with the side of the main body 111 close to the bottom plate 13, and the side of the reinforcing rib 112 close to the bottom plate 13 in the height direction of the end plate body 1 is configured as the inclined surface 1121. This prevents the angle formed between the reinforcing rib 112 and the main body 111 from affecting the penetration of the tab 42, thereby achieving rapid penetration and improving assembly efficiency.

[0046] like Figure 4 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 has a main body 111 and reinforcing ribs 112, while the other is connected to the guide plate 15. The guide plate 15 is positioned between the two side plates 11 and is tilted away from the base plate 13. A through hole 14 is formed between the guide plate 15 and the opposing side plate 11.

[0047] Specifically, the two side panels 11 are respectively a first side panel and a second side panel, a reinforcing rib 112 is provided on the first side panel, and a guide plate 15 is connected to the second side panel. It can be understood that a through hole 14 is defined between the side of the guide plate 15 away from the second side panel and the first side panel. A first guide surface extending from the second side panel toward the through hole 14 is formed on the side of the guide plate 15 facing the bottom plate 13. During the assembly process of the tab 42 and the battery end plate, when the tab 42 is passed through the through hole 14, the first guide surface guides the tab 42, and can guide the tab 42 to the through hole 14, realizing rapid punching, thereby improving assembly efficiency. At the same time, the guide plate 15 can also serve as a reinforcement member on the second side panel to reinforce the second side panel.

[0048] The guide plate 15 has a second guide surface parallel to the first guide surface formed on one side away from the bottom plate 13. Figure 8A receiving groove is formed between the second guide surface and the second side plate. After passing through the insertion hole 14, the tab 42 is bent and received within the receiving groove. Guided by the second guide surface, the tab 42 is securely received within the receiving groove, preventing contact between the tab 42 and the electrode assembly, which could cause a short circuit.

[0049] like Figure 4 As shown in FIG, in the embodiment of the present invention, the included angle α between the guide plate 15 and the plane where the bottom plate 13 is located is 0° to 75°. Figure 2 and Figure 3 The bottom plate 13 is a flat plate having a first side surface and a second side surface facing each other. The two side plates 11 are protruding from the first side surface. The second side surface of the bottom plate 13 forms the bottom surface of the end plate body 1. The bottom surface of the bottom plate 13 abuts against the end surface 41 of the pole group 4. The angle between the guide plate 15 and the bottom surface is 0° to 75°.

[0050] Optionally, the angle α is 30°, 45°, 60°, or 75°. If the angle α is too small, it will not guide the tab 42, causing the tab 42 to be inserted upside down into the pole group 4, resulting in a short circuit. If the angle α is too large, it will make it difficult to form the end plate body 1, increasing the processing difficulty.

[0051] Further, see Figure 4 The dimension S of the through hole 14 in the width direction of the end plate body 1 is S, 0.5 mm ≤ S ≤ 2 / 3 W, where W is the width of the end plate body 1 .

[0052] Specifically, the two side panels 11 are arranged in parallel and perpendicular to the bottom panel 13. The width W of the end panel body 1 is the distance between the sides of the two side panels 11 that are away from each other. The width of the through hole 14 is consistent with the width direction of the end panel body 1. It should be noted that when the reinforcing rib 112 is protruding from the inner side of the first side panel and the second side panel is connected to the guide plate 15, the through hole 14 is defined between the reinforcing rib 112 and the guide plate 15, and the width of the through hole 14 is determined by the distance between the reinforcing rib 112 and the guide plate 15 in the width direction of the end panel body 1.

[0053] As shown in Table 1, experiments were conducted to test the tab 42 passing through the end plate under different dimensions W and S. When W was 12.6 mm and S was 0.5 mm ≤ S ≤ 8.4 mm, the tab 42 was able to pass through the end plate, with an assembly yield of 99% or higher for the end plate and electrode assembly 4. CT inspection also showed that the tab 42 was in good shape.

[0054] Further experiments revealed that within the range of 10mm≤W≤40mm, the same experimental results were achieved by setting 0.5mm≤S≤2 / 3W. For example, when W is 10mm, the value range of S is 0.5mm-6.66mm. When W is 20mm, the value range of S is 0.5mm-13.3mm. When W is 40mm, the value range of S is 0.5mm-26.66mm.

[0055] Table 1: Experimental results of the tab passing through the end plate under different sizes W and S

[0056] like Figure 4 and Figure 7 As shown, in some embodiments of the present invention, the portion of the two side panels 11 between the first panel portion 131 and the second panel portion 132 is provided with an escape groove 113. The side of the bottom panel 13 that contacts the end surface 41 is the bottom surface of the end panel body 1. The distance between the bottom of the escape groove 113 and this bottom surface is h. Here, 0.5 mm ≤ h ≤ 0.5H, where H is the height of the end panel body 1.

[0057] Specifically, the side plate 11 is perpendicular to the bottom plate 13, and a relief groove 113 is provided on the side of the side plate 11 close to the bottom plate 13. The relief groove 113 is located between the first plate portion 131 and the second plate portion 132 of the bottom plate 13. In this way, when the bottom plate 13 abuts against the end face 41 of the pole group 4, a relief gap 6 is formed between the relief groove 113 and the end face 41 of the pole group 4. The width of the relief gap 6 is the distance between the bottom of the relief groove 113 and the bottom face. By setting a relief gap of 0.5mm~0.5H, it is possible to prevent the side plate 11 from crushing the tab 42 and ensure that the tab 42 does not pass through the gap, causing the tab 42 to contact the shell 3 and cause a short circuit.

[0058] As shown in Table 2, experiments were conducted to test the tab 42 passing through the end plate at different dimensions H and h. When H was 6 mm, and the value of S was 0.5 mm ≤ S ≤ 3 mm, the tab 42 was able to pass through the end plate, achieving a yield rate of 99% or higher for assembly of the end plate and electrode assembly 4. CT inspection also showed that the tab 42 was in good shape.

[0059] Further experiments revealed that within the range of 4mm≤H≤10mm, the same experimental results can be obtained by setting 0.5mm≤h≤0.5H. For example, when H is 4mm, the value range of h is 0.5mm~2mm. When H is 6mm, the value range of h is 0.5mm~3mm. When H is 8mm, the value range of h is 0.5mm~4mm. When H is 10mm, the value range of h is 0.5mm~5mm.

[0060] Table 2: Experimental results of the tab passing through the end plate at different sizes H and h

[0061] like Figure 8 As shown, an embodiment of the present invention further provides a battery comprising a housing 3, an electrode group 4, an insulating film 5, and the battery end plate described in any of the above embodiments. The housing 3 has a receiving cavity and an opening communicating with the receiving cavity. The electrode group 4 is received in the receiving cavity, and the battery end plate is disposed in the opening. The insulating film 5 is disposed between the electrode group 4 and the housing 3 and is fixedly connected to at least the side plate 11 having the reinforcing rib 112.

[0062] The battery further includes a cover plate assembly 7, which is disposed at the opening. The battery end plate is located between the cover plate assembly 7 and the electrode group 4. 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 has a reinforcing rib 112, and the other is connected to a guide plate 15, so that both side plates 11 can be heat-melted to the insulating film 5.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery end plate, characterized in that: include: The end plate body includes a side plate and a bottom plate, the two side plates are arranged opposite to each other in the width direction of the end plate body and are 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 surface of the pole group with the pole ear, and the insertion hole is used for the pole ear to pass through; at least one of the side plates has a main body and a reinforcing rib protruding from the main body, and the reinforcing rib extends along the length direction of the end plate body.

2. The battery end plate according to claim 1, characterized in that: The reinforcing rib is protrudingly arranged on one side of the main body portion close to the other side plate.

3. The battery end plate according to claim 2, characterized in that: The reinforcing rib is connected to the main body portion in an arc transition on a side close to the bottom plate in the height direction of the end plate body.

4. The battery end plate according to claim 2, characterized in that: The reinforcing rib is provided as an inclined surface on a side close to the bottom plate in the height direction of the end plate body, and the inclined surface is provided in an inclined manner from the main body portion toward a direction away from the bottom plate.

5. The battery end plate according to claim 4, characterized in that: The inclined surface is inclined from a side edge of the main body close to the bottom plate toward a direction away from the bottom plate.

6. The battery end plate according to any one of claims 1 to 5, characterized in that: The end plate body also includes a guide plate, one of the two side plates has the main body and the reinforcing ribs, and the other is connected to the guide plate; the guide plate is located between the two side plates and is inclined away from the bottom plate, and the through hole is formed between the guide plate and the side plate opposite to it.

7. The battery end plate according to claim 6, characterized in that: The included angle between the guide plate and the plane where the base plate is located is 0°~75°.

8. The battery end plate according to claim 6, characterized in that: The dimension of the through hole in the width direction is S, 0.5 mm ≤ S ≤ 2 / 3 W, where W is the width of the end plate body.

9. The battery end plate according to claim 1, characterized in that: The bottom plate includes a first plate portion and a second plate portion spaced apart in the longitudinal direction, one end of the two side plates is connected by the first plate portion, and the other end is connected by the second plate portion; the through hole is formed between the two side plates, the first plate portion, and the second plate portion; The portion of the side plate located between the first plate portion and the second plate portion is provided with an avoidance groove, the side of the bottom plate that abuts against the end face is the bottom face of the end plate body, and the distance between the bottom of the avoidance groove and the bottom face is h; wherein, 0.5mm≤h≤0.5H, H is the height of the end plate body.

10. A battery, characterized in that: include: A housing, a pole group, an insulating film and a battery end plate according to any one of claims 1 to 9; The shell is provided with a accommodating cavity and an opening connected to the accommodating cavity, the electrode group is accommodated in the accommodating cavity, the battery end plate is arranged at the opening, the insulating film is arranged between the electrode group and the shell, and the insulating film is fixedly connected to at least the side plate having the reinforcing rib.

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