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: a bottom plate, which is used for abutting against the end surface of a pole group provided with a tab; the first side plate and the second side plate are oppositely arranged in the width direction of the end plate and are connected through the bottom plate; the reinforcing part is connected to the side, close to the second side plate, of the first side plate and extends in the length direction of the end plate, a penetrating hole is formed between the reinforcing part and the second side plate and used for allowing a tab to penetrate through, a first guide face is arranged on the side, close to the bottom plate, of the reinforcing part and extends to the penetrating hole from the first side plate, and the first guide face is provided with a second guide face. The base plate is obliquely arranged in a direction far away from the base plate. According to the battery end plate, the strength and rigidity of the first side plate are enhanced through the reinforcer, bending deformation of the first side plate in the hot melting process with the insulating film is prevented, and normal shell entering of a pole group is ensured. And meanwhile, the first guide surface on the first side plate plays a role in guiding the penetration of the tabs, so that rapid perforation is facilitated, and the assembly efficiency is improved.

Description

Technical Field

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

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

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

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

[0005] This utility model provides a battery end plate, comprising:

[0006] The base plate is used to abut against the end face of the electrode assembly where the electrode tabs are located;

[0007] A first side plate and a second side plate are disposed opposite to each other in the width direction of the end plate and connected by the bottom plate;

[0008] A reinforcing member is connected to the side of the first side plate near the second side plate and extends along the length direction of the end plate; an insertion hole is formed between the reinforcing member and the second side plate for the electrode tab to pass through; a first guide surface is provided on the side of the reinforcing member near the bottom plate, the first guide surface extends from the first side plate to the insertion hole and is inclined away from the bottom plate.

[0009] According to the present invention, the angle between the first guide surface and the plane of the base plate is α, where 0°≤α≤75°.

[0010] According to the battery end plate provided by this utility model, it also includes:

[0011] A reinforcing plate is connected to the side of the second side plate near the first side plate and extends along the length direction. The insertion hole is formed between the reinforcing member and the reinforcing plate. A second guide surface is formed on the side of the reinforcing plate near the bottom plate. The second guide surface extends from the second side plate to the insertion hole and is inclined away from the bottom plate.

[0012] According to the present invention, the angle between the second guide surface and the plane of the base plate is β, where 0°≤β≤75°.

[0013] According to the present invention, the end of the first guide surface away from the first side plate and the end of the second guide surface away from the second side plate are offset in the height direction of the end plate.

[0014] According to the present invention, a battery end plate is provided in which a receiving groove is formed between the side of the reinforcing plate away from the bottom plate and the second side plate, and the electrode tab is bent between the first side plate and the second side plate, and the receiving groove is adapted to accommodate the bent portion of the electrode tab.

[0015] According to the present invention, the dimension of the insertion hole in the width direction is S; wherein, 0.5mm≤S≤2 / 3W, and W is the width of the end plate.

[0016] 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 first side plate and the second side plate are connected through the first plate portion, and the other end is connected through the second plate portion; the through hole is formed between the first side plate, the second side plate, the first plate portion and the second plate portion.

[0017] Both the first side plate and the second side plate have clearance grooves 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. 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.

[0018] This utility model also provides a battery, comprising: a casing, an electrode assembly, an insulating film, and any one of the above-mentioned battery end plates;

[0019] The housing has a receiving cavity and an opening communicating with the receiving cavity. The electrode assembly is housed in the receiving cavity. The battery end plate is disposed in the opening. The insulating film is disposed between the electrode assembly and the housing. The insulating film is at least fixedly connected to the first side plate.

[0020] According to the present invention, the size of the insertion hole in the length direction is 2mm to 8mm larger than the width of the electrode tab.

[0021] The battery end plate and battery provided by this utility model enhance the strength and rigidity of the first side plate by connecting a reinforcing member to the first side plate. This reinforcing member extends along the length of the end plate, preventing bending deformation during the heat-fusion process with the insulating film and ensuring proper insertion of the subsequent electrode assembly. Simultaneously, the side of the reinforcing member near the bottom plate has a first guide surface extending from the first side plate to the insertion hole. This guide surface guides the electrode tab during insertion, directing it to the insertion hole, facilitating rapid insertion and improving assembly efficiency. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the structure of the battery end plate provided by this utility model.

[0024] Figure 2 This is a structural schematic diagram of the battery end plate provided by this utility model from another perspective.

[0025] Figure 3 This is a top view of the battery end plate provided by this utility model.

[0026] Figure 4 This is a side view of the battery end plate provided by this utility model.

[0027] Figure 5 yes Figure 3 A cross-sectional view of the battery end plate at point AA.

[0028] Figure 6 This is a cross-sectional view of another battery end plate provided by this utility model.

[0029] Figure 7 This is a partial cross-sectional view of the battery provided by this utility model.

[0030] Figure label:

[0031] 11. First side plate; 111. Clearance groove; 12. Second side plate; 13. Base plate; 131. First plate portion; 132. Second plate portion; 14. Through hole; 15. Reinforcing member; 151. First guide surface; 16. Reinforcing plate; 161. Second guide surface; 162. Third guide surface; 17. First connecting plate; 18. Second connecting plate; 3. Housing; 4. Electrode assembly; 41. End face; 42. Electrode lug; 5. Insulating film; 6. Clearance gap; 7. Cover plate assembly. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] The following is combined with Figures 1-7 This invention describes the battery end plate and battery.

[0035] like Figure 1 , Figure 2 and Figure 7As shown, the battery end plate provided in this embodiment of the present invention includes a base plate 13, a first side plate 11, a second side plate 12, and a reinforcing member 15. The base plate 13 is used to abut against the end face 41 of the electrode assembly 4, which is provided with a tab 42. The first side plate 11 and the second side plate 12 are arranged opposite to each other in the width direction of the end plate and are connected by the base plate 13. The reinforcing member 15 is connected to the side of the first side plate 11 near the second side plate 12 and extends along the length direction of the end plate. An insertion hole 14 is formed between the reinforcing member 15 and the second side plate 12 for the tab 42 to pass through. The side of the reinforcing member 15 near the base plate 13 is provided with a first guide surface 151, which extends from the first side plate 11 to the insertion hole 14 and is inclined away from the base plate 13.

[0036] The first side plate 11 and the second side plate 12 are arranged at intervals along the width of the end plate, extending along the length direction of the end plate, with the height direction of the end plate perpendicular to the bottom plate 13. The first side plate 11 and the second side plate 12 are elongated strip-shaped plates extending along the length direction of the end plate, with their length direction consistent with the length direction of the end plate and their width direction consistent with the height direction of the end plate. The through hole 14 is a strip-shaped hole formed between the first side plate 11 and the second side plate 12, with its dimension along the length direction of the end plate being larger than the width of the electrode tab 42, allowing the electrode tab 42 to pass through it.

[0037] Furthermore, the end plate also includes a first connecting plate 17, with two first connecting plates 17 arranged opposite each other in the length direction of the end plate. The first side plate 11, the second side plate 12, and the two first connecting plates 17 surround and form the entire annular sidewall of the end plate, and the bottom plate 13 is connected to one end of the annular sidewall.

[0038] 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. The first side plate 11, which is connected to the reinforcing member 15, can be welded to the insulating film 5 at multiple points. Furthermore, two first connecting plates 17 can also be welded to the insulating film 5. The first connecting plates 17 are relatively small and less prone to heat-fusion deformation.

[0039] The first side plate 11 is connected to a reinforcing member 15, which extends along the length of the end plate, thus enhancing the strength and rigidity of the first side plate 11. Simultaneously, the reinforcing member 15 has a first guide surface 151 on the side near the base plate 13. The first guide surface 151 extends from the first side plate 11 to the through hole 14 and is inclined away from the base plate 13. When the electrode tab 42 passes through the through hole 14 between the reinforcing member 15 and the second side plate 12, the first guide surface 151 guides the electrode tab 42 through the hole, enabling rapid insertion and improving assembly efficiency.

[0040] In some embodiments, the reinforcing member 15 may be a planar plate-like member inclined relative to the first side plate 11, see [reference]. Figure 5 One end of the reinforcement 15 is connected to the first side plate 11, and the other end extends away from the bottom plate 13, so that the reinforcement 15 is inclined relative to the first side plate 11, and it can be integrally formed with the first side plate 11 by injection molding.

[0041] In other embodiments, the reinforcing member 15 may also be a structural member independent of the first side plate 11. For example, the reinforcing member 15 may have a trapezoidal cross-sectional shape in the width direction of the end plate, with the first guide surface 151 corresponding to one hypotenuse of the trapezoid. See [reference needed]. Figure 6 The reinforcing member 15 can be glued, snapped, or embedded in the side of the first side plate 11 near the second side plate 12. The reinforcing member 15 should be made of a material that does not react with the electrolyte. The reinforcing member 15 can be an insulating component, such as a ceramic plate or a plastic plate; or, the reinforcing member 15 can be a non-insulating component of the same metal material as the tab 42, such as an aluminum plate or a copper plate.

[0042] In one embodiment where the reinforcing member 15 is bonded to the first side plate 11, the reinforcing member 15 and the first side plate 11 can be bonded together using adhesive or tape. In another embodiment where the reinforcing member 15 is snapped into the first side plate 11, one of the reinforcing member 15 and the first side plate 11 has a buckle, and the other has a slot, with the buckle snapping into the slot. Multiple connection points can be provided between the reinforcing member 15 and the first side plate 11, spaced apart along the length of the end plate, with each connection point corresponding to a pair of buckles and slots.

[0043] The battery end plate provided in this embodiment of the utility model enhances the strength and rigidity of the first side plate 11 by connecting a reinforcing member 15 to the first side plate 11. The reinforcing member 15 extends along the length of the end plate, thereby preventing the first side plate 11 from bending and deforming during the heat fusion process with the insulating film 5, ensuring the normal insertion of the subsequent electrode assembly 4 into the casing. Simultaneously, the side of the reinforcing member 15 near the bottom plate 13 has a first guide surface 151 extending from the first side plate 11 to the insertion hole 14. The first guide surface 151 guides the electrode tab 42 during insertion, directing it to the insertion hole 14, facilitating rapid insertion and improving assembly efficiency.

[0044] like Figure 5 As shown in the embodiment of this utility model, the angle between the first guide surface 151 and the plane where the base plate 13 is located is α, where 0°≤α≤75°.

[0045] Specifically, see Figure 1 The base plate 13 is a flat plate with a first side and a second side facing away from each other. The first side plate 11 and the second side plate 12 protrude from the first side. The second side of the base plate 13 forms the bottom surface of the end plate. The base plate 13 abuts against the end surface 41 of the pole group 4 through the bottom surface. The angle between the first guide surface 151 and the bottom surface is α.

[0046] 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 and increase the processing difficulty.

[0047] like Figure 1 , Figure 2 and Figure 5 As shown, the battery end plate provided in this embodiment of the present invention also includes a reinforcing plate 16. The reinforcing plate 16 is connected to the side of the second side plate 12 near the first side plate 11 and extends along the length direction of the end plate. An insertion hole 14 is formed between the reinforcing member 15 and the reinforcing plate 16. A second guide surface 161 is formed on the side of the reinforcing plate 16 near the bottom plate 13. The second guide surface 161 extends from the second side plate 12 to the insertion hole 14 and is inclined away from the bottom plate 13.

[0048] See Figure 5One end of the reinforcing plate 16 is connected to the second side plate 12, and the other end extends at an angle away from the base plate 13 relative to the second side plate 12. The reinforcing plate 16 and the second side plate 12 can be integrally formed by injection molding. The reinforcing plate 16 can enhance the strength and rigidity of the second side plate 12 to prevent the second side plate 12 from bending and deforming during the hot-melt process. In this way, the insulating film 5 can be simultaneously hot-melt connected to the first side plate 11 and the second side plate 12, setting more hot-melt points and improving the connection strength between the insulating film 5 and the end plate.

[0049] See Figure 5 and Figure 6 The first side plate 11 is connected to a reinforcing member 15, and the second side plate 12 is connected to a reinforcing plate 16. A through hole 14 is defined between the end of the reinforcing plate 16 away from the second side plate 12 and the end of the reinforcing member 15 away from the first side plate 11. When the electrode tab 42 is passed through the through hole 14, both the first guide surface 151 and the second guide surface 161 guide the electrode tab 42 through the through hole 14, further improving the ease of penetration and thus increasing assembly efficiency.

[0050] During the assembly of tab 42 and battery end plate, when tab 42 is pushed out of through hole 14, the first guide surface 151 and the second guide surface 161 both guide tab 42 to be pushed out, which can guide tab 42 to through hole 14, further improving the convenience of pushing through and thus improving assembly efficiency.

[0051] Furthermore, such as Figure 5 As shown, the angle between the second guide surface 161 and the plane containing the base plate 13 is β, where 0° ≤ β ≤ 75°. Specifically, the angle between the second guide surface 161 and the bottom surface of the base plate 13 is β. Optionally, the β angle can be 30°, 45°, 60°, or 75°. If the β 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 β angle is too large, it will make it difficult to form the end plate, increasing the processing difficulty.

[0052] Furthermore, such as Figure 5 and Figure 6 As shown, the end of the first guide surface 151 away from the first side plate 11 and the end of the second guide surface 161 away from the second side plate 12 are offset in the height direction of the end plate. That is, there is a height difference between the end of the first guide surface 151 away from the first side plate 11 and the end of the second guide surface 161 away from the second side plate 12 in the height direction of the end plate. When inserting the tab 42, the tab 42 can be pushed along the second guide surface 161 towards the insertion hole 14. Due to this height difference, it can be ensured that the tab 42 can smoothly pass out of the insertion hole 14 after reaching the insertion hole 14 along the second guide surface 161, thereby improving the insertion efficiency of the tab 42.

[0053] It is understandable that, in the case where both reinforcing member 15 and reinforcing plate 16 are planar plate-shaped parts, see [reference]. Figure 5 In the height direction of the end plate, the height of the end of the reinforcing plate 16 away from the second side plate 12 relative to the bottom plate 13 is higher than the height of the end of the reinforcing member 15 away from the first side plate 11 relative to the bottom plate 13.

[0054] Optionally, the second guide surface 161 has a larger dimension in the width direction of the end plate than the first guide surface 151 in the width direction of the end plate. In this way, the second guide surface 161 has a larger area than the first guide surface 151. When inserting the electrode tab 42, the second guide surface 161 can be used to guide the electrode tab 42, thereby reducing the operating accuracy and improving the insertion efficiency of the electrode tab 42.

[0055] In some embodiments of this utility model, a receiving groove is formed between the side of the reinforcing plate 16 away from the bottom plate 13 and the second side plate 12, and the electrode tab 42 is bent and disposed between the first side plate 11 and the second side plate 12. The receiving groove is adapted to accommodate the bent portion of the electrode tab 42.

[0056] Optionally, a third guide surface 162 is formed on the side of the reinforcing plate 16 away from the base plate 13, and the third guide surface 162 is inclined from the second side plate 12 in a direction away from the base plate 13. See Figure 6 A receiving groove is formed between the third guide surface 162 and the second side plate 12. After the electrode tab 42 passes through the insertion hole 14, it is bent and received in the receiving groove. Under the guidance of the third guide surface 162, the electrode tab 42 can be reliably received in the receiving groove, preventing the electrode tab 42 from contacting the electrode assembly 4 and causing a short circuit. The reinforcing plate 16 can be a flat plate, that is, the second guide surface 161 and the third guide surface 162 are parallel.

[0057] like Figure 4 As shown, in some embodiments of this utility model, the dimension of the insertion hole 14 in the width direction of the end plate is S; wherein, 0.5mm≤S≤2 / 3W, and W is the width of the end plate.

[0058] Specifically, the first side plate 11 and the second side plate 12 are arranged in parallel and perpendicular to the bottom plate 13. The width W of the end plate is the distance between the sides of the first side plate 11 and the second side plate 12 that are far apart from each other. The width direction of the through hole 14 is consistent with the width direction of the end plate. Optionally, the reinforcing member 15 and the reinforcing plate 16 are arranged opposite each other in the width direction of the end plate, that is, the width of the through hole 14 is equal to the distance between the reinforcing member 15 and the reinforcing plate 16 in the width direction of the end plate. If S is too small, it is difficult for the electrode tab 42 to pass through; if S is too large, the closing shape of the electrode tab 42 is poor.

[0059] 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.

[0060] 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.

[0061] Table 1: Experimental results of the tabs passing through the endplate under different sizes W and S.

[0062]

[0063] like Figure 1 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 plates. One end of the first side plate 11 and the second side plate 12 are connected by the first plate portion 131, and the other end is connected by the second plate portion 132. An insertion hole 14 is formed between the first side plate 11, the second side plate 12, the first plate portion 131, and the second plate portion 132.

[0064] Specifically, the first 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, and the second side plate 12 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. 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 electrode assembly 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 base plate 13 abuts against the end face 41 of the electrode assembly 4 while preventing the base plate 13 from pressing against the electrode tab 42.

[0065] Furthermore, such as Figure 2As shown, the side of the first plate portion 131 closest to the second plate portion 132 is connected to the first side plate 11 and the second side plate 12 via a second connecting plate 18, and the side of the second plate portion 132 closest to the first plate portion 131 is connected to the first side plate 11 and the second side plate 12 via another second connecting plate 18. A reinforcing member 15 and a reinforcing plate 16 are disposed between the two second connecting plates 18 to enhance the strength and rigidity of corresponding areas on the first side plate 11 and the second side plate 12. Of course, the length of the reinforcing member 15 can also be greater than the distance between the two second connecting plates 18, or equivalent to the length of the first side plate 11; the length of the reinforcing plate 16 can also be greater than the distance between the two second connecting plates 18, or equivalent to the length of the second side plate 12.

[0066] Furthermore, the end of the first plate portion 131 away from the second plate portion 132 is connected to a first connecting plate 17, and the end of the second plate portion 132 away from the first plate portion 131 is connected to another first connecting plate 17.

[0067] like Figure 4 and Figure 5 As shown, in some embodiments of this utility model, the portions of the first side plate 11 and the second side plate 12 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, 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.

[0068] Specifically, the first side plate 11 and the second side plate 12 are perpendicular to the base plate 13. A clearance groove 111 is provided on the side of the first side plate 11 and the second side plate 12 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 first side plate 11 and the second side plate 12 can be prevented from damaging the electrode tab 42, and the electrode tab 42 can be prevented from protruding through the gap, thus avoiding contact between the electrode tab 42 and the housing 3 and causing a short circuit.

[0069] 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.

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

[0071] Table 2: Experimental results of the tabs passing through the endplate under different sizes H and h.

[0072]

[0073] like Figure 7 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 within 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 the first side plate 11.

[0074] The battery also includes a cover assembly 7, which covers the opening. The battery end plate is located between the cover assembly 7 and the electrode group 4, and the electrode tab 42 is electrically connected to the electrode post on the cover assembly 7. Optionally, the first side plate 11 is connected to a reinforcing member 15, and the second side plate 12 is connected to a reinforcing plate 16, so that both the first side plate 11 and the second side plate 12 can be thermally welded to the insulating film 5.

[0075] Optionally, the dimension of the insertion hole 14 in the length direction of the end plate is at least 2mm to 8mm larger than the width of the tab 42. For example... Figure 3 As shown, the dimension of the insertion hole 14 along the length of the end plate is K, and the width of the tab 42 is w, where w+2mm≤K≤w+8mm, and w is the width of the tab 42. If K is too small, it will cause interference between the tab 42 and the end plate structure, and the tab 42 will be easily damaged when it is inserted.

[0076] 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 base plate is used to abut against the end face of the electrode assembly where the electrode tabs are located; A first side plate and a second side plate are disposed opposite each other in the width direction of the end plate and connected by the bottom plate; A reinforcing member is connected to the side of the first side plate near the second side plate and extends along the length direction of the end plate; an insertion hole is formed between the reinforcing member and the second side plate for the electrode tab to pass through; a first guide surface is provided on the side of the reinforcing member near the bottom plate, the first guide surface extends from the first side plate to the insertion hole and is inclined away from the bottom plate.

2. The battery end plate according to claim 1, characterized in that, The angle between the first guide surface and the plane where the base plate is located is α, where 0°≤α≤75°.

3. The battery end plate according to claim 1, characterized in that, Also includes: A reinforcing plate is connected to the side of the second side plate near the first side plate and extends along the length direction. The insertion hole is formed between the reinforcing member and the reinforcing plate. A second guide surface is formed on the side of the reinforcing plate near the bottom plate. The second guide surface extends from the second side plate to the insertion hole and is inclined away from the bottom plate.

4. The battery end plate according to claim 3, characterized in that, The angle between the second guide surface and the plane where the base plate is located is β, where 0°≤β≤75°.

5. The battery end plate according to claim 3, characterized in that, The end of the first guide surface away from the first side plate and the end of the second guide surface away from the second side plate are offset in the height direction of the end plate.

6. The battery end plate according to claim 5, characterized in that, A receiving groove is formed between the side of the reinforcing plate away from the base plate and the second side plate. The electrode tab is bent between the first side plate and the second side plate, and the receiving groove is adapted to accommodate the bent portion of the electrode tab.

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

8. The battery end plate according to any one of claims 1-7, 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 first side plate and the second side plate are connected through the first plate portion, and the other end is connected through the second plate portion. The through hole is formed between the first side plate, the second side plate, the first plate portion, and the second plate portion. Both the first side plate and the second side plate have clearance grooves 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. 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.

9. A battery, characterized in that, include: The casing, electrode assembly, insulating film, and battery end plate as described in any one of claims 1-8; The housing has a receiving cavity and an opening communicating with the receiving cavity. The electrode assembly is housed in the receiving cavity. The battery end plate is disposed in the opening. The insulating film is disposed between the electrode assembly and the housing. The insulating film is at least fixedly connected to the first side plate.

10. The battery according to claim 9, characterized in that, The size of the insertion hole in the length direction is 2mm to 8mm larger than the width of the electrode tab.

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