Battery end plate and battery

Abstract

The 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 and a reinforcing 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 reinforcing piece is arranged on at least one side plate of the end plate body, the reinforcing piece extends in the length direction of the end plate body, the strength and rigidity of the side plate are enhanced through the reinforcing piece, bending deformation of the side plate in the hot melting process of the side plate and an insulating film can be prevented, and it is guaranteed that a follow-up pole 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, and the end plate sits between the cover assembly and the electrode assembly, creating a storage space between them. The electrode tabs extend through the end plate and are welded to the electrode posts on the cover assembly. The tabs are bent and accommodated within this space. To isolate and protect the electrode assembly, an insulating film is placed 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, before inserting the electrode assembly into the housing, an insulating film is applied to the outside of the electrode assembly and then heat-sealed to the end plates. The assembled electrode assembly, end plates, and insulating film are then installed into the housing. However, during the heat-sealing process, the end plates were found to be susceptible to significant bending deformation, causing the sidewalls of the end plates to warp, hindering subsequent housing insertion. 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 existing batteries, 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: an end plate body, comprising two side plates and a bottom plate, the two side plates being arranged 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 surface of the pole group provided with a pole ear, and the insertion hole being used for the pole ear to pass through; a reinforcement piece, at least one of the two side plates being provided with the reinforcement piece, and the reinforcement piece extending along the length direction of the end plate body.

[0006] According to a battery end plate provided by the present invention, the reinforcement is provided with interference ribs, and the reinforcement is connected to the end plate body via the interference ribs.

[0007] 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 length direction of the end plate body, 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 interference rib is provided at at least one end of the reinforcement in the length direction, and is interference fit with the corresponding first plate portion or the second plate portion; or, the interference rib is provided on a side of the reinforcement close to the side plate, and is interference fit with the side plate.

[0008] According to a battery end plate provided by the present invention, there are multiple interference ribs, and the interference ribs are arranged on at least one side of the length direction of the reinforcement, and the multiple interference ribs are arranged at intervals along the thickness direction of the reinforcement; or, the interference ribs are arranged on one side of the reinforcement close to the side plate, and the multiple interference ribs are arranged at intervals along the length direction of the reinforcement.

[0009] According to a battery end plate provided by the present invention, the reinforcement member includes an insulating reinforcement member or a non-insulating reinforcement member made of the same material as the tab.

[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 is provided with the reinforcement, and the other is connected to the guide plate, the guide plate is arranged between the two side plates and is inclined in a direction away from the bottom plate, and the through hole is formed between the side plate and the guide plate.

[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, a 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 of the electrode group is the bottom surface, and the distance between the bottom of the avoidance groove and the bottom surface 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, a pole group, an insulating film and a battery end plate as described in any one of the above items; the shell is provided with a accommodating cavity and an opening connected to the accommodating cavity, the pole group is accommodated in the accommodating cavity, the battery end plate is arranged in the opening, the insulating film is arranged between the pole group and the shell, and the insulating film is fixedly connected to at least the side plate.

[0015] The battery end plate and battery provided by the present invention are characterized by providing a reinforcement member on at least one side plate of the end plate body, wherein the reinforcement member extends along the length direction of the end plate body. The reinforcement member is used 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 an exploded schematic diagram of the battery end plate provided by the present invention.

[0018] Figure 2 yes Figure 1 A partial enlarged view of the C area on the middle reinforcement; Figure 3 It is a structural schematic diagram of the battery end plate provided by the present invention.

[0019] Figure 4 It is a top view of the battery end plate provided by the present invention.

[0020] Figure 5 yes Figure 4 A partial magnified view of area D in the middle.

[0021] Figure 6 It is a front view of the battery end plate provided by the present invention.

[0022] Figure 7 yes Figure 6 Cross-section at BB.

[0023] Figure 8 yes Figure 4 Cross-section at AA in the middle.

[0024] Figure 9 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. Avoidance groove; 12. Connecting plate; 13. Bottom plate; 131. First plate portion; 132. Second plate portion; 14. Through hole; 15. Guide plate; 2. Reinforcement member; 21. Interference rib; 211. Chamfer; 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 of the embodiments of the present invention, not all of them. 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 specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present invention.

[0029] 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0030] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0031] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will appreciate the applicability of other processes and / or the use of other materials.

[0032] The following combination Figures 1-9 The battery end plate and battery of the present invention are described.

[0033] like Figures 1 to 8 As shown, the battery end plate provided by the embodiment of the present invention includes an end plate body 1 and a reinforcement 2. 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 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 tab 42 is provided, and the insertion hole 14 is used for the pole tab 42 to pass through. At least one of the two side plates 11 is provided with a reinforcement 2, and the reinforcement 2 is extended along the length direction of the end plate body 1.

[0034] like Figure 1 and Figure 3 As shown, the two side panels 11 are spaced apart across the width of the end panel body 1. The side panels 11 extend along the length of the end panel body 1, with the direction perpendicular to the bottom panel 13 being the height direction of the end panel body 1. The side panels 11 are long, strip-shaped panels extending along the length of the end panel body 1. The length of the side panels 11 coincides with the length of the end panel body 1, and the width of the side panels 11 coincides with the height of the end panel 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 panel body 1 is greater than the width of the tab 42, allowing the tab 42 to pass through it.

[0035] Furthermore, the end plate body 1 also includes a connecting plate 12, and the two 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 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.

[0036] Before the battery is inserted into the shell, the bottom plate 13 of the battery end plate is aligned with the end face 41 of the electrode assembly 4, where the tab 42 is located. The tab 42 on the end face 41 is inserted into the insertion hole 14, and the insulating film 5 is heat-welded 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 reinforcement 2 provided on the side plate 11 prevents bending and deformation during the heat-welding process between the side plate 11 and the insulating film 5. Furthermore, two connecting plates 12 can be welded to the insulating film 5. The connecting plates 12 are relatively small and are less susceptible to heat-welding deformation.

[0037] At least one of the two side plates 11 is provided with a reinforcement 2 , which extends along the length direction of the end plate body 1 , that is, the reinforcement 2 extends along the length direction of the side plate 11 , which can enhance the strength and rigidity of the side plate 11 .

[0038] The battery end plate provided in an embodiment of the present invention is provided with a reinforcement 2 on at least one side plate 11 of the end plate body 1. The reinforcement 2 extends along the length direction of the end plate body 1. The reinforcement 2 is used to enhance the strength and rigidity of the side plate 11, thereby preventing the side plate 11 from bending and deforming during the hot melting process with the insulating film 5, thereby ensuring the normal insertion of the subsequent electrode group 4 into the shell.

[0039] In the embodiment of the present invention, the reinforcement 2 can be connected to the side panel 11 in a variety of ways. In one embodiment, the reinforcement 2 is embedded in the side panel 11. The reinforcement 2 can be completely embedded in the interior of the side panel 11, or the reinforcement 2 can be partially embedded in the side panel 11. It is understood that at least a portion of the reinforcement 2 is wrapped within the side panel 11, so that the reinforcement 2 is fixedly connected to the side panel 11. The end panel body 1 is an injection molded part. In actual production, the reinforcement 2 and the end panel body 1 can be injection molded together through an injection molding process.

[0040] In another embodiment, the reinforcement 2 is snapped onto the side panel 11. Specifically, one of the side panel 11 and the reinforcement 2 is provided with a slot, and the other is provided with a bayonet, and the buckle is matched and snapped into the slot. In one embodiment, a plurality of connection points are provided between the reinforcement 2 and the side panel 11, and the plurality of connection points are spaced apart along the length direction of the end plate body 1, and each connection point is correspondingly provided with a pair of buckles and slots. In a specific embodiment, the buckle has a connecting portion and a hook portion, and the hook portion is provided at one end of the connecting portion and extends to one side of the connecting portion. When the buckle is snapped into the slot, the hook portion is confined within the slot.

[0041] In another embodiment, the reinforcement 2 and the side panel 11 are connected by a clamping member. In one embodiment, the clamping member has a clamping opening, and the reinforcement 2 and the side panel 11 are clamped in the clamping opening. Specifically, the clamping member includes a first limiting portion, a second limiting portion, an abutting portion, a first clamping portion, and a second clamping portion. The first end of the first limiting portion and the first end of the second limiting portion are respectively connected to the opposite sides of the abutting portion. The first clamping portion is provided at the second end of the first limiting portion, and the second clamping portion is provided at the second end of the second clamping portion. There is a spacing between the first clamping portion and the second clamping portion to form a clamping opening; under the action of an external force, the first clamping portion and the second clamping portion can move away from each other or reset. It should be noted that in the clamping state, the abutting portion abuts against the top surface of the reinforcement 2 and the side panel 11, one of the first clamping portion and the second clamping portion abuts against the side wall of the reinforcement 2, and the other abuts against the side wall of the side panel 11. In one embodiment, the width of the clamp is greater than or equal to 3 mm, such as 3 mm, 5 mm, etc., but the maximum is less than or equal to the length of the reinforcement 2. The width of the clamp is consistent with the length of the end plate body 1. The clamp is an insulating clamp, and the insulation resistance is greater than or equal to 1MΩ. In this embodiment, there can be one, clamped in the middle of the reinforcement 2, or there can be multiple, such as two, two clamps clamped at both ends of the length direction of the reinforcement 2. There can also be 3, 4, 5, etc. The multiple clamps are spaced apart along the length direction of the end plate body 1. Furthermore, the multiple clamps can be evenly distributed along the length direction of the end plate body 1 to improve stability. In another embodiment, the reinforcement 2 is connected to the side panel 11 by tape. In another embodiment, the reinforcement 2 can be connected to the side panel 11 by gluing. In addition, the reinforcement 2 can also be connected to the side panel 11 by hot melting or hot riveting.

[0042] like Figure 2 、 Figure 4 and Figure 5 As shown, the reinforcement member 2 is provided with interference ribs 21 , and the reinforcement member 2 is connected to the end plate body 1 via the interference ribs 21 .

[0043] In a specific embodiment, the interference rib 21 is provided on the side of the reinforcement 2 close to the side panel 11 and is interference fit with the side panel 11. The interference rib 21 in the embodiment of the present invention may be one, and is provided in the middle of the length direction of the reinforcement 2, that is, at a position of 1 / 3-2 / 3 in the length direction of the reinforcement 2. The interference rib 21 in the embodiment of the present invention may also be multiple, such as 2, 3, 5, 8, etc. The multiple interference ribs 21 are spaced apart along the length direction of the reinforcement 2 to increase the stability of the connection between the reinforcement 2 and the side panel 11. Furthermore, the multiple interference ribs 21 are evenly distributed along the length direction of the reinforcement 2 to enhance its stability. The number of interference ribs 21 in the embodiment of the present invention is not limited and is set according to the length of the reinforcement 2.

[0044] In another specific embodiment, Figure 6 and Figure 7 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.

[0045] 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 of the pole group 4, which is provided with the pole lug 42. When the bottom 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 either side of the pole lug 42 to ensure that the bottom plate 13 abuts against the end face 41 of the pole group 4 while preventing the bottom 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 on the inner side of the two connecting plates 12.

[0046] 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.

[0047] Optionally, the reinforcement 2 is provided on the side panel 11 in an area between the first plate portion 131 and the second plate portion 132, that is, the reinforcement 2 extends from the first plate portion 131 to the second plate portion 132 to strengthen the strength and rigidity of this area. Optionally, the reinforcement 2 is a plate-shaped member, and its thickness direction is consistent with the thickness direction of the side panel 11. Furthermore, one end of the first plate portion 131 away from the second plate portion 132 is connected to a connecting plate 12, and one end of the second plate portion 132 away from the first plate portion 131 is connected to another connecting plate 12. The interference rib 21 is provided at at least one end of the reinforcement 2 in the length direction, and is interference-fitted with the corresponding first plate portion 131 or second plate portion 132, such as Figure 2 As shown. In the embodiment of the present invention, there can be one interference rib 21, which is extended along the height direction of the reinforcement 2. The interference rib 21 can be set in the middle of the thickness direction of the reinforcement 2. In the embodiment of the present invention, there can also be multiple interference ribs 21, such as 2, 3, 5, 8, etc. Figure 2As shown, two interference ribs 21 are provided on the reinforcement member 2. Multiple interference ribs 21 are spaced apart along the thickness of the reinforcement member 2 to enhance the stability of the connection between the reinforcement member 2 and the side panel 11. Furthermore, the multiple interference ribs 21 are evenly distributed along the thickness of the reinforcement member 2 to enhance its stability. In this embodiment of the present invention, the number of interference ribs 21 is not limited and is set according to the thickness of the reinforcement member 2.

[0048] In order to facilitate assembly, a chamfer 211 can be provided on the interference rib 21, such as Figure 2 As shown, the angle of chamfer 211 is not specifically limited and is set according to actual needs. The interference margin of interference rib 21 is 0.05-0.3mm, and can be 0.05mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.25mm, 3mm, etc. It should be noted that the interference margin is the difference between the sum of the distances between the reinforcement member 2 and the interference rib 21 along the length direction of the end plate body 1 and the distance between the side plate 11, which is the interference margin.

[0049] The reinforcement 2 in the embodiment of the present invention can be arranged on the side where the two side panels 11 are close to each other, or on the side where the two side panels 11 are far away from each other. The two side panels 11 in the embodiment of the present invention are respectively the first side panel and the second side panel. In one embodiment, the first side panel is provided with a reinforcement 2, and the reinforcement 2 is arranged on the side where the first side panel and the second side panel are close to each other. In this case, the spacing between the first side panel and the second side panel is consistent with the width of the bottom panel 13, and is also consistent with the width of the first plate portion 131 and the second plate portion 132. In another embodiment, the reinforcement 2 is arranged on the side where the first side panel and the second side panel are far away from each other. In this case, the spacing between the reinforcement 2 and the second side panel is consistent with the width of the bottom panel 13, and is also consistent with the width of the first plate portion 131 and the second plate portion 132.

[0050] Optionally, the first side panel is provided with a first reinforcement, and the second side panel is provided with a second reinforcement. In one embodiment, the first reinforcement is provided on a side of the first side panel close to the second side panel, and the second reinforcement is provided on a side of the second side panel close to the first side panel. In this case, the spacing between the first side panel and the second side panel is consistent with the width of the bottom panel 13, and is also consistent with the width of the first plate portion 131 and the second plate portion 132. In one embodiment, the first reinforcement is provided on a side of the first side panel away from the second side panel, and the second reinforcement is provided on a side of the second side panel away from the first side panel. In this case, the spacing between the first reinforcement and the second reinforcement is consistent with the width of the bottom panel 13, and is also consistent with the width of the first plate portion 131 and the second plate portion 132. In one embodiment, the first reinforcement is provided on a side of the first side panel away from the second side panel, and the second reinforcement is provided on a side of the second side panel close to the first side panel. In this case, the spacing between the first reinforcement and the second side panel is consistent with the width of the bottom panel 13, and is also consistent with the width of the first plate portion 131 and the second plate portion 132. In one embodiment, the first reinforcement is arranged on the side of the first side panel close to the second side panel, and the second reinforcement is arranged on the side of the second side panel away from the first side panel. At this time, the distance between the second reinforcement and the first side panel is consistent with the width of the bottom panel 13, and is also consistent with the width of the first plate portion 131 and the second plate portion 132.

[0051] The reinforcement member 2 in the embodiments of the present invention should be non-reactive with the electrolyte. The reinforcement member 2 can be an insulating member 2 to prevent short circuits when in contact with the tab 42. The reinforcement member 2 can also be a non-insulating member 2 made of the same material as the tab 42, such as an aluminum plate or copper plate. The reinforcement member 2 can also be a ceramic member 2 or a plastic member 2.

[0052] like Figure 8 and Figure 9 As shown, in some embodiments of the present invention, the end plate body 1 also includes a guide plate 15, one of the two side plates 11 is provided with a reinforcement 2, and the other is connected to the guide plate 15, the guide plate 15 is arranged between the two side plates 11, and is inclined in a direction away from the bottom plate 13, and an insertion hole 14 is formed between the side plate 11 and the guide plate 15.

[0053] Specifically, the two side panels 11 are respectively the first side panel and the second side panel, the first side panel is provided with a reinforcement member 2, and the second side panel is connected to a guide plate 15. It can be understood that the guide plate 15 defines a through hole 14 between the side away from the second side panel and the first side panel. The side of the guide plate 15 facing the bottom plate 13 is formed with a first guide surface extending from the second side panel toward the through hole 14. 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 2 on the second side panel to reinforce the second side panel.

[0054] 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 8 A 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 4 and causing a short circuit.

[0055] like Figure 8 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°-75°. 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°-75°.

[0056] Optionally, the angle α is 30°, 45°, 55°, 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.

[0057] Further, see Figure 8 The dimension 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.

[0058] 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 reinforcement 2 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 reinforcement 2 and the guide plate 15, and the width of the through hole 14 is determined by the distance between the reinforcement 2 and the guide plate 15 in the width direction of the end panel body 1.

[0059] As shown in Table 1, experiments were conducted to test the tab 4 passing through the end plate body 1 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 body 1, achieving a yield rate of 99% or higher for the assembly of the end plate body 1 and the electrode assembly 4. CT inspection also showed that the tab 42 was in good shape.

[0060] 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.

[0061] Table 1: Experimental results of the tab passing through the end plate body under different sizes W and S

[0062] like Figure 3 and Figure 8 As shown, in some embodiments of the present invention, the two side plates 11 are provided with a relief groove 111 between the first plate portion 131 and the second plate portion 132. The side of the bottom plate 13 that contacts the end surface 41 of the electrode assembly 4 is the bottom surface of the end plate body 1. The distance between the bottom of the relief groove 111 and the bottom surface is h, where 0.5 mm ≤ h ≤ 0.5H; H is the height of the end plate body 1.

[0063] Specifically, the side plate 11 is perpendicular to the bottom plate 13, and a side plate 11 is provided with an avoidance groove 111 on the side of the side plate 11 close to the bottom plate 13. The avoidance groove 111 is located between the two plate portions 131 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 avoidance gap 6 is formed between the avoidance groove 111 and the end face 41 of the pole group 4. The width of the avoidance gap 6 is the distance between the bottom of the avoidance groove 111 and the bottom face. By setting a avoidance gap 6 of 0.5mm~0.5H, the present invention can prevent the side plate 11 from crushing the tab 42 and ensure that the tab 42 will not pass through the gap, causing the tab 42 to contact the shell 3 and cause a short circuit.

[0064] As shown in Table 2, experiments were conducted to test the tab 4 passing through the end plate body 1 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 body 1, achieving a yield rate of 99% or higher for the assembly of the end plate body 1 and the electrode assembly 4. CT inspection also showed that the tab 42 was in good shape.

[0065] Table 2: Experimental results of the tab passing through the end plate body at different sizes H and h

[0066] 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.

[0067] like Figure 9 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 provided with the reinforcement 2.

[0068] The battery further 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. 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 embedded with a reinforcement 2, 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.

[0069] 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 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 surface of the electrode group provided with the electrode lug, and the insertion hole is used for the electrode lug to pass through. A reinforcement member is provided on at least one of the two side plates, and the reinforcement member is extended along the length direction of the end plate body.

2. The battery end plate according to claim 1, characterized in that: The reinforcement is provided with interference ribs, and the reinforcement is connected to the end plate body via the interference ribs.

3. The battery end plate according to claim 2, characterized in that: The bottom plate includes a first plate portion and a second plate portion spaced apart in the longitudinal direction of the end plate body, 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 interference rib is provided at at least one end of the reinforcement member in the longitudinal direction, and is interference-fitted with the corresponding first plate portion or second plate portion; Alternatively, the interference rib is provided on a side of the reinforcement member close to the side plate and is interference fit with the side plate.

4. The battery end plate according to claim 2, characterized in that: There are multiple interference ribs, each of which is provided on at least one side of the reinforcement in the length direction, and the multiple interference ribs are spaced apart along the thickness direction of the reinforcement; Alternatively, the interference rib is provided on a side of the reinforcement member close to the side plate, and a plurality of the interference ribs are arranged at intervals along the length direction of the reinforcement member.

5. The battery end plate according to claim 1, characterized in that: The reinforcement member includes an insulating reinforcement member or a non-insulating reinforcement member made of the same material as the tab.

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 is provided with the reinforcement, and the other is connected to the guide plate. The guide plate is arranged between the two side plates and is inclined in the direction away from the bottom plate. The through hole is formed between the side plate and the guide plate.

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 1, 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 3, characterized in that: 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 of the pole group is the bottom face, 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 receiving cavity and an opening communicating with the receiving cavity. The pole group is accommodated in the receiving cavity. The battery end plate is arranged at the opening. The insulating film is arranged between the pole group and the shell. The insulating film is fixedly connected to at least the side plate.

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