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, 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 end plate body is provided with a through hole; 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; the reinforcing piece is embedded in at least one side plate, and the reinforcing piece is arranged in the length direction of the end plate body in an extending mode. According to the battery end plate, the reinforcers are embedded on the side plates, so that the strength and the rigidity of the side plates are enhanced, the side plates can be prevented from being bent and deformed in a hot melting process with an insulating film, and a subsequent electrode group is ensured to enter a shell normally.

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. The electrode tabs of the electrode assembly pass through the end plate and are welded to the terminals on the cover plate assembly. To isolate and protect the electrode assembly, an insulating film is required 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, during production and assembly, an insulating film is first fitted onto the outside of the electrode assembly, and the insulating film is then heat-fused to the end plate. The electrode assembly, end plate, and insulating film are then assembled into a single unit 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 side plates of the end plate to warp and affecting subsequent housing installation 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:

[0006] The end plate body includes a side plate and a bottom plate. 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.

[0007] A reinforcing member is embedded in at least one of the side plates, and the reinforcing member extends along the length direction of the end plate body.

[0008] According to the present invention, a battery end plate is provided in which the reinforcing member is completely embedded inside the side plate.

[0009] According to the present invention, a battery end plate is provided in which the reinforcing member is partially embedded in the side plate and located on the side of the two side plates that are close to each other.

[0010] According to the present invention, the reinforcing member is an insulating member, or the reinforcing member is a non-insulating member made of the same metal material as the tab.

[0011] According to the present invention, the reinforcing member is one of a metal plate, a ceramic plate, or a plastic plate.

[0012] 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 embedded 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 away from the bottom plate, and the through hole is formed between the guide plate and the opposite side plate.

[0013] According to the present invention, the angle between the guide plate and the plane of the base plate is 0° to 75°.

[0014] According to the present invention, the size of the insertion hole in the width direction is S, 0.5mm≤S≤2 / 3W, where W is the width of the end plate body.

[0015] According to the present invention, a battery end plate is provided, wherein the bottom plate includes a first plate portion and a second plate portion that are spaced apart in the length direction, 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; the through hole is formed between the two side plates, the first plate portion and the second plate portion;

[0016] The side plate is provided with a clearance groove in the portion between the first plate portion and the second plate portion. The side of the bottom plate that abuts against the end face is the bottom surface of the end plate body. The distance between the bottom of the clearance groove and the bottom surface is h; where 0.5mm≤h≤0.5H, and H is the height of the end plate body.

[0017] This utility model also provides a battery, including: a shell, an electrode assembly, an insulating film, and any of the above-mentioned battery end plates;

[0018] 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 fixedly connected to at least the side plate provided with the reinforcing member.

[0019] The battery end plate and battery provided by this utility model have a reinforcing member embedded in the side plate of the end plate body. The reinforcing member extends along the length direction of the end plate body. 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

[0020] 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.

[0021] Figure 1 This is an exploded view of the battery end plate provided by this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the battery end plate provided by this utility model.

[0023] Figure 3 This is a top view of the battery end plate provided by this utility model.

[0024] Figure 4 yes Figure 3 A cross-sectional view of the battery end plate at point AA.

[0025] Figure 5 This is a side view of the battery end plate provided by this utility model.

[0026] Figure 6 This is a partial cross-sectional view of the battery provided by this utility model.

[0027] Figure label:

[0028] 1. End plate body; 11. Side plate; 111. Clearance groove; 12. First connecting plate; 13. Base plate; 131. First plate portion; 132. Second plate portion; 14. Through hole; 15. Guide plate; 16. Second connecting plate; 2. Reinforcing member; 3. Housing; 4. Electrode assembly; 41. End face; 42. Electrode lug; 5. Insulating film; 6. Clearance gap; 7. Cover plate assembly. Detailed Implementation

[0029] 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 protection scope of this utility model.

[0030] In the description of the embodiments of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are numbered for the purpose of clearly identifying product components and do not represent any substantial difference. The terms "installed," "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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances. Furthermore, "multiple" means two or more. In the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0031] The following is combined Figures 1-6 This invention describes the battery end plate and battery.

[0032] like Figure 1 and Figure 6 As shown, the battery end plate provided in this embodiment of the present invention includes an end plate body 1 and a reinforcing member 2. 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 face 41 of the electrode assembly 4 where a tab 42 is provided, and the insertion hole 14 is used for the tab 42 to pass through. At least one side plate 11 is embedded with a reinforcing member 2, which extends along the length direction of the end plate body 1.

[0033] Two side plates 11 are spaced apart across the width of the end plate body 1. The side plates 11 extend along the length 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 plates 11 are elongated strips extending along the length of the end plate body 1, with the length direction of the side plates 11 aligned with the length direction of the end plate body 1, and the width direction of the side plates 11 aligned 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, and its dimension along the length 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.

[0034] Furthermore, the end plate body 1 also includes a first connecting plate 12. The two first 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 first 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.

[0035] 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, and the electrode tabs 42 located 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, which has the embedded reinforcing member 2, can be welded to the insulating film 5 at multiple points. Furthermore, two first connecting plates 12 can also be welded to the insulating film 5. The first connecting plates 12 are relatively small and less prone to heat-fusion deformation.

[0036] The side plate 11 is fitted with a reinforcing member 2, which extends along the length of the end plate body 1, thus enhancing the strength and rigidity of the side plate 11. It is understood that at least a portion of the reinforcing member 2 is enclosed within the side plate 11, securing it to the side plate 11. The end plate body 1 is an injection-molded part; in actual production, the reinforcing member 2 can be injection-molded together with the end plate body 1.

[0037] The battery end plate provided in this embodiment of the utility model has a reinforcing member 2 embedded 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 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.

[0038] Optionally, such as Figure 2 and Figure 3 As shown, 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 via the first plate portion 131, and the other end is connected via the second plate portion 132. An insertion hole 14 is formed between the two side plates 11, the first plate portion 131, and the second plate portion 132.

[0039] 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. When the base plate 13 abuts against the end face 41 of the pole group 4, the first plate portion 131 and the second plate portion 132 are located on both sides of the pole tab 42 to ensure that the base plate 13 abuts against the end face 41 of the pole group 4 while avoiding the base plate 13 pressing against the pole tab 42.

[0040] 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.

[0041] Furthermore, such as Figure 1 As shown, the side of the first plate portion 131 closest to the second plate portion 132 is connected to the two side plates 11 via a second connecting plate 16, and the side of the second plate portion 132 closest to the first plate portion 131 is connected to the two side plates 11 via another second connecting plate 16. A reinforcing member 2 is disposed between the two second connecting plates 16 to enhance the strength and rigidity of the corresponding area on the side plate 11. Of course, the length of the reinforcing member 2 can also be greater than the distance between the two second connecting plates 16, or approximately equal to the length of the side plate 11. Optionally, the reinforcing member 2 is a plate-shaped member whose thickness direction is consistent with the thickness direction of the side plate 11.

[0042] Furthermore, the end of the first plate portion 131 away from the second plate portion 132 is connected to a first connecting plate 12, and the end of the second plate portion 132 away from the first plate portion 131 is connected to another first connecting plate 12.

[0043] like Figure 4 As shown, in some embodiments of this utility model, the reinforcing member 2 is completely embedded inside the side plate 11, that is, the side plate 11 completely covers the outside of the reinforcing member 2. In this case, the reinforcing member 2 can be an insulating member or a non-insulating member. When the reinforcing member 2 is a non-insulating member, completely embedding the reinforcing member 2 inside the side plate 11 can prevent it from contacting the tab 42 and causing a short circuit. Of course, the reinforcing member 2 can also be partially embedded inside the side plate 11. It should be noted that the reinforcing member 2 partially embedded in the side plate 11 should not react with the electrolyte. The specific arrangement of the reinforcing member 2 is determined according to the material properties of the reinforcing member 2.

[0044] Optionally, the reinforcing member 2 is partially embedded in the side plate 11 and located on the side of the two side plates 11 that are close to each other. The side of the two side plates 11 that is close to each other is defined as the inner side of the side plate 11, and the side that is far from each other is defined as the outer side of the side plate 11. That is, the reinforcing member 2 is embedded in the side plate 11 and exposed on the inner side of the side plate 11. In this way, it can be ensured that the insulating film 5 can be thermally fused to the outer side of the side plate 11.

[0045] Of course, if the reinforcing member 2 is partially embedded in the side plate 11 and located on the side of the two side plates 11 that are far apart from each other, that is, when the reinforcing member 2 is embedded in the side plate 11 and exposed on the outside of the side plate 11, if the reinforcing member 2 can be directly heat-fused with the insulating film 5, or if the outside of the side plate 11 has space for setting a heat-fusion point, then the reinforcing member 2 can also be embedded on the outside.

[0046] Furthermore, when the reinforcing member 2 is partially embedded inside the side plate 11, the reinforcing member 2 is an insulating member. The insulating nature of the reinforcing member 2 can prevent short circuits when it comes into contact with the electrode tab 42. Alternatively, the reinforcing member 2 can be a non-insulating member made of metal material on the electrode tab 42.

[0047] In this embodiment of the invention, the reinforcing member 2 is one of a metal plate, a ceramic plate, or a plastic plate. When the metal plate is made of the same metal material as the tab 42, such as aluminum or copper, it can be partially or completely embedded in the side plate 11; when the metal plate is made of a different metal material than the tab 42, it is completely embedded in the side plate 11. The ceramic plate is an insulating component and can be partially or completely embedded in the side plate 11. The plastic plate is an insulating component; when it is a material that cannot react with the electrolyte, it can be partially or completely embedded in the side plate 11; when it is a material that can react with the electrolyte, it is completely embedded in the side plate 11. When the plastic plate is completely embedded in the side plate 11, the strength and rigidity of the plastic plate should be greater than the strength and rigidity of the side plate 11.

[0048] like Figure 3 and Figure 4 As shown, in some embodiments of this utility model, the end plate body 1 further includes a guide plate 15. One of the two side plates 11 is fitted with a reinforcing member 2, and the other is connected to the guide plate 15. The guide plate 15 is located between the two side plates 11 and is inclined away from the bottom plate 13. An insertion hole 14 is formed between the guide plate 15 and the opposite side plate 11.

[0049] Specifically, the two side plates 11 are a first side plate and a second side plate, respectively. A reinforcing member 2 is embedded in the first side plate, and a guide plate 15 is connected to the second side plate. 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. A first guide surface extending from the second side plate towards the insertion hole 14 is formed on the side of the guide plate 15 facing the base plate 13. 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 on the second side plate, strengthening it.

[0050] 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 6 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.

[0051] like Figure 4 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, see... Figure 2 and Figure 3The 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. 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 group 4 through the bottom surface. The angle between the guide plate 15 and the bottom surface is 0° to 75°.

[0052] Optionally, the α angle can be 30°, 45°, 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.

[0053] Further, see Figure 4 The dimension S of the insertion hole 14 in the width direction of the end plate body 1 is S, 0.5mm≤S≤2 / 3W, where W is the width of the end plate body 1.

[0054] 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.

[0055] As shown in Table 1, experiments were conducted on the electrode tab 42 passing through the end plate 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, the assembly yield of the end plate and electrode assembly 4 is ≥ 99%, and CT scan shows that the electrode tab 42 has a good folded shape.

[0056] 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.

[0057] Table 1: Experimental results of the tabs passing through the endplate under different sizes W and S.

[0058]

[0059] like Figure 4 and Figure 5As shown, in some embodiments of this utility model, the portions of the two side plates 11 located between the first plate portion 131 and the second plate portion 132 are provided with clearance grooves 111. The side of the bottom plate 13 that abuts against the end face 41 is the bottom surface of the end plate body 1, and the distance between the bottom of the clearance groove 111 and the bottom surface is h. Wherein, 0.5mm≤h≤0.5H, and H is the height of the end plate body 1.

[0060] Specifically, the side plate 11 is perpendicular to the base plate 13, and a clearance groove 111 is provided on the side of the side plate 11 closest to the base plate 13. The clearance groove 111 is 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 of 0.5mm to 0.5H, the side plate 11 can be prevented from damaging the electrode tab 42, and the electrode tab 42 can be prevented from passing through the gap, causing the electrode tab 42 to contact the housing 3 and cause a short circuit.

[0061] As shown in Table 2, experiments were conducted on the electrode tab 42 passing through the end plate 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, the assembly yield of the end plate and electrode assembly 4 is ≥ 99%, and CT scan shows that the electrode tab 42 has a good folded shape.

[0062] 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.

[0063] Table 2: Experimental results of the tabs passing through the endplate under different sizes H and h.

[0064]

[0065] 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.

[0066] 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.

[0067] 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 in that, include: The end plate body includes a side plate and a bottom plate. 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 embedded in at least one of the side plates, and the reinforcing member extends along the length direction of the end plate body.

2. The battery end plate according to claim 1, characterized in that, The reinforcing member is completely embedded inside the side plate.

3. The battery end plate according to claim 1, characterized in that, The reinforcing member is partially embedded in the side plate and is located on the side of the two side plates that are close to each other.

4. The battery end plate according to claim 3, characterized in that, The reinforcing member is an insulating member, or the reinforcing member is a non-insulating member made of the same metal material as the tab.

5. The battery end plate according to claim 1, characterized in that, The reinforcing member is one of a metal plate, a ceramic plate, or a plastic plate.

6. The battery end plate according to any one of claims 1-5, characterized in that, The end plate body also includes a guide plate, one of the two side plates is embedded 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 away from the bottom plate, and the through hole is formed between the guide plate and the opposite side plate.

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

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

9. The battery end plate according to claim 1, characterized in that, The base plate includes a first plate portion and a second plate portion spaced apart along the length direction. 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. The through hole is formed between the two side plates, the first plate portion, and the second plate portion. The side plate is provided with a clearance groove in the portion between the first plate portion and the second plate portion. The side of the bottom plate that abuts against the end face is the bottom surface of the end plate body. The distance between the bottom of the clearance groove and the bottom surface is h; where 0.5mm≤h≤0.5H, and H is the height of the end plate body.

10. A battery, characterized in that, 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 fixedly connected to at least the side plate provided with the reinforcing member.

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