Battery

Abstract

The present invention relates to the technical field of batteries, and provides a battery, which comprises: a shell provided with an accommodating cavity and an opening communicating with the accommodating cavity; the pole group is accommodated in the accommodating cavity; the end plate comprises two side plates and a bottom plate, the two side plates are oppositely arranged in the width direction of the end plate 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 the electrode lug, of the electrode group, and the electrode lug penetrates through the insertion hole; the end plate is arranged in the opening, the size of the opening in the width direction is D, the width of the end plate is W, and W is larger than or equal to 0.85 D and smaller than or equal to (D-0.5 mm). According to the battery, the two long side edges of the end plates can be ensured to smoothly enter the shell, the tabs can be better folded between the two side plates, the short circuit of the pole group caused by the contact of the tabs and the shell is avoided, the shell entering yield is improved, the better hot melting of the insulating films and the side plates can be ensured, the insulating films and the side plates are prevented from being separated, and the anti-seismic property of the battery is improved.

Description

Technical Field

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

[0002] The current power battery structure usually places the electrode group in a shell, and an end plate and a cover plate assembly are provided at the opening of the shell. The cover plate assembly is used to seal the shell, and the end plate is located between the cover plate assembly and the electrode group, so that a storage space is formed between the cover plate assembly and the electrode group. The pole ear is passed through the end plate and welded to the pole post on the cover plate assembly. The pole ear is bent and accommodated in the storage space. During assembly, an insulating film is usually placed on the outside of the electrode group, and the insulating film is fixed to the end plate by hot melting. The whole assembly of the electrode group, end plate and insulating film is then installed in the shell. However, with current technology, it is easy for the end plate to fail to enter the shell during assembly, or for the pole ear to easily contact the shell after entering the shell, causing a short circuit in the electrode group. Summary of the Invention

[0003] The present invention provides a battery for solving the problem in the prior art that, during the battery assembly process, an end plate is likely to fail to fit into a shell, or after being fitted into the shell, a tab is likely to contact the shell, causing a short circuit in the electrode group.

[0004] The present invention provides a battery, comprising: A housing, comprising a receiving cavity and an opening communicating with the receiving cavity; an electrode group, housed in the accommodating cavity; The end plate 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 and are connected by the bottom plate. An insertion hole is formed between the two side plates. The bottom plate is used to abut against the end surface of the pole group with a pole ear, and the pole ear is inserted into the insertion hole; the end plate is arranged in the opening, the dimension of the opening in the width direction is D, the width of the end plate is W, 0.85D≤W≤(D-0.5mm).

[0005] According to a battery provided by the present invention, the dimension of the opening in the longitudinal direction of the end plate is C, the length of the end plate is L, and 0.97C≤L≤(C-0.5mm).

[0006] According to a battery provided by the present invention, the dimension of the insertion hole in the length direction of the end plate is at least 2 mm larger than the width of the tab.

[0007] According to a battery provided by the present invention, the bottom plate includes a first plate portion and a second plate portion spaced apart in the longitudinal direction of the end plate, one end of the two side plates is connected by the first plate portion, and the other end is connected by the second plate portion; the through hole is formed between the two side plates, the first plate portion, and the second plate portion; An avoidance groove is provided on the portion of the side plate located between the first plate portion and the second plate portion, the side of the bottom plate that abuts against the end surface is the bottom surface of the end plate, 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.

[0008] According to a battery provided by the present invention, the two side plates are respectively a first side plate and a second side plate, and the end plate further includes a reinforcing plate, which is connected to a side of the second side plate close to the first side plate and is tilted away from the bottom plate.

[0009] According to a battery provided by the present invention, the angle between the reinforcing plate and the plane where the bottom plate is located is α, and 0°≤α≤75°.

[0010] According to a battery provided by the present invention, a receiving groove is formed between the side of the reinforcing plate away from the bottom plate and the second side plate; the tab is bent and arranged between the two side plates, and the receiving groove is suitable for accommodating the bent portion of the tab.

[0011] According to a battery provided by the present invention, a size of the insertion hole in the width direction is S, and 0.5 mm ≤ S ≤ 2 / 3W.

[0012] According to a battery provided by the present invention, the end plate further includes a reinforcement member, which is connected to the first side plate and extends along the length direction of the end plate.

[0013] According to a battery provided by the present invention, the reinforcement is embedded in, clamped in, or adhered to the first side plate.

[0014] The battery provided by the present invention ensures that the width W of the end plate and the width D of the housing opening meet the relationship of 0.85D ≤ W ≤ (D - 0.5 mm). This ensures that the two long sides of the end plate can be smoothly inserted into the housing and that the tabs are well tucked between the two side plates. This prevents the tabs from moving, tearing, or squeezing the insulating film. This further prevents contact between the tabs and the housing, which could cause a short circuit in the electrode assembly. This improves the battery's housing insertion yield. This design also ensures that the insulating film and the side plates are well fused, preventing them from separating and improving the battery's shock resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 It is a partial cross-sectional view of the battery provided by the present invention.

[0017] Figure 2 It is a structural schematic diagram of the end plate of the battery provided by the present invention.

[0018] Figure 3 It is a top view of the end plate of the battery provided by the present invention.

[0019] Figure 4 It is a structural schematic diagram of the end plate of the battery provided by the present invention from another perspective.

[0020] Figure 5 It is a side view of the end plate of the battery provided by the present invention.

[0021] Figure 6 yes Figure 3 Cross-sectional view of the middle plate at AA.

[0022] Figure 7 It is a cross-sectional view of another end plate provided by the present invention.

[0023] Reference numerals: 1. End plate; 11. Side plate; 11a. First side plate; 11b. Second side plate; 111. Avoidance groove; 12. First connecting plate; 13. Bottom plate; 131. First plate portion; 132. Second plate portion; 14. Through hole; 15. Reinforcement member; 16. Reinforcement plate; 17. Second connecting plate; 3. Shell; 4. Pole group; 41. End face; 42. Pole ear; 5. Insulating film; 6. Avoidance gap; 7. Cover plate assembly. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are for the purpose of clearly describing the numbering of product components and do not represent any substantial difference. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more. "And / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0026] The following combination Figure 1-Figure 7 The battery of the present invention is described.

[0027] like Figure 1-Figure 3 As shown, the battery provided by the embodiment of the present invention includes an end plate 1, a shell 3 and a pole group 4. The shell 3 is provided with a receiving cavity and an opening connected to the receiving cavity. The pole group 4 is accommodated in the receiving cavity. The end plate 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 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 pole group 4 on which the pole ear 42 is provided. The pole ear 42 is inserted into the insertion hole 14. The end plate 1 is arranged in the opening. The dimension of the opening in the width direction of the end plate 1 is D. The width of the end plate 1 is W. 0.85D≤W≤(D-0.5mm).

[0028] The two side panels 11 are spaced apart across the width of the end panel 1. The side panels 11 extend along the length of the end panel 1, with the direction perpendicular to the bottom panel 13 defining the height of the end panel 1. The side panels 11 are long, strip-shaped members extending along the length of the end panel 1, with their length aligned with the length of the end panel 1 and their width aligned with the height of the end panel 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 1 is greater than the width of the tab 42, allowing the tab 42 to pass through it.

[0029] The two side panels 11 are arranged parallel to each other and perpendicular to the bottom panel 13. The width W of the end panel 1 is the distance between the two side panels 11 facing away from each other. As shown in Table 1, electrode assembly insertion tests were conducted under different dimensions D and W. When D was 14.3 mm, and the conditions were 12.155 mm ≤ W ≤ 13.8 mm, the insulating film 5 and the end panel 1 were well fused, eliminating the risk of separation. The battery passed the vibration test, and the electrode assembly 4 insertion yield was ≥99%.

[0030] Further experiments revealed that within the range of 12mm≤D≤40mm, the same experimental results were achieved by setting 0.85D≤W≤(D-0.5mm). For example, when D is 12mm, the range of W is 10.2mm≤W≤11.5mm. When D is 20mm, the range of W is 17mm≤W≤19.5mm. When D is 40mm, the range of W is 34mm≤W≤39.5mm.

[0031] Table 1: Experimental results of the pole assembly into the shell with different sizes D and W

[0032] During the battery assembly process, the bottom plate 13 of the end plate 1 is first abutted against the end face 41 of the electrode group 4, and the electrode tab 42 on the end face 41 is inserted into the insertion hole 14. Then, the insulating film 5 and the side plate 11 are heat-melted and welded, and the electrode group is placed into the case.

[0033] The battery provided by the embodiment of the present invention ensures that the width W of the end plate 1 and the opening width D of the shell 3 meet the relationship of 0.85D≤W≤(D-0.5mm). This ensures that the two long sides of the end plate 1 can be smoothly inserted into the shell, and also ensures that the tab 42 can be well gathered between the two side plates 11, thereby preventing the tab 42 from moving, tearing, and squeezing the insulating film 5. This further prevents the tab 42 from contacting the shell 3 and causing a short circuit in the electrode group 4, thereby improving the shell insertion yield. At the same time, this design also ensures that the insulating film 5 and the side plates 11 are well fused, preventing the insulating film 5 and the side plates 11 from detaching, and improving the battery's shock resistance.

[0034] Furthermore, in the embodiment of the present invention, the dimension of the opening of the shell 2 in the longitudinal direction of the end plate 1 is C, the length of the end plate 1 is L, and 0.97C≤L≤(C-0.5mm).

[0035] Among them, see Figure 4 The end plate 1 also includes a first connecting plate 12. The two first connecting plates 12 are arranged opposite to each other in the length direction of the end plate 1. The two side plates 11 and the two first connecting plates 12 surround and form the entire annular side wall of the end plate 1. The bottom plate 13 is connected to one end of the annular side wall.

[0036] The two first connecting plates 12 are arranged parallel to each other and perpendicular to the bottom plate 13. The length L of the end plate 1 is the distance between the two first connecting plates 12 on their sides facing away from each other. As shown in Table 2, electrode assembly insertion tests were conducted under different dimensions C and L. When C was 119 mm, and L was 115.43 mm ≤ L ≤ 118.5 mm, the insulating film 5 and the end plate 1 were well fused, with no risk of separation. The battery passed the vibration test, and the electrode assembly 4 insertion yield was ≥99%.

[0037] Further experiments revealed that within the range of 80mm ≤ C ≤ 300mm, the same experimental results were achieved by setting 0.97C ≤ L ≤ (C - 0.5mm). For example, when C is 80mm, the range of L is 77.6mm ≤ L ≤ 79.5mm. When D is 150mm, the range of L is 145.5mm ≤ L ≤ 149.5mm. When D is 300mm, the range of L is 291mm ≤ L ≤ 299.5mm.

[0038] Table 2: Experimental results of electrode group insertion under different sizes C and L

[0039] When the opening length of the housing 1 is between 80mm and 300mm, setting the length L of the end plate 1 and the opening length C of the housing 3 to meet the requirement of 0.97C≤L≤(C-0.5mm) ensures smooth insertion of the two wide sides of the end plate 1. This also ensures a good thermal fusion between the insulating film 5 and the side plate 11, preventing separation and improving the battery's shock resistance. Actual production test statistics show that by setting the requirements of 0.85D≤W≤(D-0.5mm) and 0.97C≤L≤(C-0.5mm), the insertion yield rate can reach over 99%.

[0040] In the embodiment of the present invention, the dimension of the through hole 14 in the longitudinal direction of the end plate 1 is at least 2 mm larger than the width of the tab 42. Figure 3 As shown, the dimension of the insertion hole 14 in the longitudinal direction of the end plate is K, and the width of the tab 42 is w, where K ≥ w + 2 mm, and w is the width of the tab 42. If K is too small, the tab 42 will interfere with the end plate structure, which may easily damage the tab 42 when inserting the tab 42.

[0041] like Figure 2 and Figure 5 As shown, in this embodiment of the present invention, 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 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. The through hole 14 is formed between the two side plates 11, the first plate portion 131, and the second plate portion 132.

[0042] Specifically, one of the side plates 11 is connected to one side of the first plate portion 131 and the second plate portion 132 at both ends in the length direction of the end plate 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 in the length direction of the end plate 1. The first plate portion 131 and the second plate portion 132 are both used to abut against the end surface 41. When the bottom plate 13 abuts against the end surface 41, 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 bottom plate 13 abuts against the end surface 41 of the pole group 4 while preventing the bottom plate 13 from pressing against the pole tab 42.

[0043] Further, such as Figure 3 and Figure 4 As shown, the side of the first plate portion 131 close to the second plate portion 132 is connected to the two side plates 11 through a second connecting plate 17 , and the side of the second plate portion 132 close to the first plate portion 131 is connected to the two side plates 11 through another second connecting plate 17 .

[0044] Furthermore, one end of the first plate portion 131 away from the second plate portion 132 is connected to one first connecting plate 12 , and one end of the second plate portion 132 away from the first plate portion 131 is connected to another first connecting plate 12 .

[0045] like Figure 5 and Figure 6 As shown, in some embodiments of the present invention, a clearance groove 111 is provided on the side panel 11 between the first panel portion 131 and the second panel portion 132. The side of the bottom panel 13 that abuts the end surface 41 forms the bottom surface of the end panel 1. The distance between the bottom of the clearance groove 111 and the bottom surface is h. Here, 0.5 mm ≤ h ≤ 0.5H, where H is the height of the end panel 1.

[0046] Specifically, the two side plates 11 are perpendicular to the bottom plate 13, and a avoidance groove 111 is provided on the side of the side plate 11 close to the bottom plate 13. The avoidance groove 111 is located between the first plate portion 131 and the second plate portion 132 of the bottom plate 13. In this way, when the bottom plate 13 abuts against the end face 41 of the pole group 4, a 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 of 0.5mm~0.5H, it is possible to prevent the two side plates 11 from crushing the tabs 42, and ensure that the tabs 42 will not pass through the gap, causing the tabs 42 to contact the shell 3 and cause a short circuit.

[0047] As shown in Table 3, experiments were conducted to test the tab 42 passing through the end plate 1 at different dimensions H and h. When H was 6 mm, 0.5 mm ≤ S ≤ 3 mm, and the tab 42 was able to pass through the end plate 1. The assembly yield of the end plate 1 and the electrode assembly 4 was ≥ 99%, and CT inspection showed that the tab 42 was in good shape.

[0048] 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.

[0049] Table 3: Experimental results of the tab passing through the end plate at different sizes H and h

[0050] like Figure 4 and Figure 6 As shown, in the embodiment of the present invention, the two side panels 11 are respectively a first side panel 11a and a second side panel 11b, and the end panel 1 also includes a reinforcing panel 16, which is connected to a side of the second side panel 11b close to the first side panel 11a and is tilted in a direction away from the bottom panel 13.

[0051] Specifically, one end of the reinforcing plate 16 is connected to the second side plate 11b, and the other end extends obliquely relative to the second side plate 11b, away from the bottom plate 13. The reinforcing plate 16 and the second side plate 11b can be integrally formed through an injection molding process. The reinforcing plate 16 enhances the strength and rigidity of the second side plate 11b, thereby preventing the second side plate 11b from bending or deforming during the hot melt process.

[0052] The insertion hole 14 is formed between the reinforcement plate 16 and the first side plate 11a. A first guide surface is formed on the side of the reinforcement plate 16 near the base plate 13, extending obliquely from the second side plate 11b away from the base plate 13. When the tab 42 is inserted through the insertion hole 14, this first guide surface guides the tab 42, directing it into the insertion hole 14 for faster insertion and improved assembly efficiency.

[0053] Furthermore, if Figure 5 As shown, the angle between the reinforcing plate 16 and the plane of the bottom plate 13 is α, where 0°≤α≤75°. Both the reinforcing plate 16 and the bottom plate 13 are planar plates, and the angle between the reinforcing plate 16 and the plane of the bottom plate 13 is the angle between the guide surface of the reinforcing plate 16 on the side closest to the bottom plate 13 and the bottom surface of the bottom plate 13.

[0054] Optionally, the angle α is 30°, 45°, 60°, or 75°. If the angle α is too small, it will not guide the tab 42, causing the tab 42 to be inserted upside down into the electrode group 4, resulting in a short circuit. If the angle α is too large, it will make it difficult to form the end plate, increasing the processing difficulty.

[0055] In some embodiments of the present invention, a receiving groove is formed between the side of the reinforcing plate 16 away from the bottom plate 13 and the second side plate 11 b. The tab 42 is bent and disposed between the two side plates 11 , and the receiving groove is suitable for accommodating the bent portion of the tab 42 .

[0056] Optionally, a second guide surface is formed on the side of the reinforcing plate 16 away from the bottom plate 13, and the second guide surface is inclined from the second side plate 11b to the direction away from the bottom plate 13. Figure 6 A receiving groove is formed between the second guide surface and the second side plate 11b. 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.

[0057] Furthermore, the dimension of the insertion hole 14 in the width direction of the end plate 1 is S, and 0.5 mm ≤ S ≤ 2 / 3 W.

[0058] As shown in Table 4, experiments were conducted to test the tab 42 passing through the end plate 1 under different dimensions W and S. When W was 12.6 mm and S was 0.5 mm ≤ 8.4 mm, the tab 42 was able to pass through the end plate 1, achieving a yield rate of 99% or higher for the assembly of the end plate 1 and the electrode assembly 4. CT inspection showed that the tab 42 was in good shape.

[0059] 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.

[0060] Table 4: Experimental results of the tab passing through the end plate under different sizes W and S

[0061] The width of the insertion hole 14 aligns with the width of the end plate 1. When the second side plate 11b is connected to the reinforcing plate 16, the insertion hole 14 is formed between the reinforcing plate 16 and the first side plate 11a. If S is too small, the tab 42 will have difficulty passing through. If S is too large, the tab 42 will not be properly folded, making it easy for the tab 42 to be inserted upside down into the electrode assembly 4.

[0062] like Figure 7As shown, in some embodiments of the present invention, the end plate 1 further includes a reinforcement member 15, which is connected to the first side plate 11a and extends along the length of the end plate 1. The reinforcement member 15 extends along the length of the first side plate 11 and can enhance the strength and rigidity of the first side plate 11a, thereby preventing the first side plate 11a from bending and deforming during the thermal fusion process with the insulating film 5, thereby ensuring the normal insertion of the subsequent electrode group 4 into the shell.

[0063] The side where the two side panels 11 are close to each other is defined as the inner side of the side panel 11, and the side where the two side panels 11 are away from each other is defined as the outer side of the side panel 11. The reinforcement 15 can be arranged on the inner side of the first side panel 11a, or on the outer side of the first side panel 11a, or can be completely embedded in the interior of the first side panel 11a. Setting the reinforcement 15 on the inner side of the first side panel 11a can ensure that the insulating film 5 can be connected to the outer side of the side panel 11 by heat melting. Of course, if the reinforcement 15 is arranged on the outer side of the first side panel 11a, if the reinforcement 15 can be directly heat-melted with the insulating film 5, or if the outer side of the side panel 11 also has space for setting a heat melting point, the reinforcement 15 can also be arranged on the outer side of the first side panel 11a.

[0064] Optionally, the reinforcement member 15 and the reinforcement plate 16 are arranged opposite to each other in the width direction of the end plate 1 , that is, the width of the through hole 14 is equal to the distance between the reinforcement member 15 and the reinforcement plate 16 in the width direction of the end plate.

[0065] In the embodiment of the present invention, the reinforcement member 15 is bonded, clamped, or embedded in the first side plate 11 a.

[0066] In the embodiment where the reinforcement member 15 is bonded to the first side panel 11 a , the reinforcement member 15 may be bonded to the inner side or outer side of the first side panel 11 a by glue or tape.

[0067] In embodiments where the reinforcement member 15 is snap-fitted to the first side panel 11a, the reinforcement member 15 can be snap-fitted to either the inner or outer side of the first side panel 11a. One of the reinforcement member 15 and the first side panel 11a is provided with a buckle, and the other is provided with a slot, into which the buckle is secured. Multiple connection points can be provided between the reinforcement member 15 and the first side panel 11a. These connection points are spaced apart along the length of the end panel, and each connection point is provided with a corresponding pair of buckles and slots.

[0068] In the embodiment where the reinforcement member 15 is embedded in the first side panel 11a, the reinforcement member 15 may be completely embedded in the first side panel 11a. The reinforcement member 15 may also be partially embedded in the first side panel 11a, wherein the reinforcement member 15 may be partially embedded in the inner side or outer side of the first side panel 11a. The end panel 1 is an injection molded part. In actual production, the reinforcement member 15 and the end panel 1 can be injection molded together using an injection molding process. When the reinforcement member 15 is partially embedded in the first side panel 11a, it can be embedded in the first side panel 11a.

[0069] In particular, when the reinforcement 15 is connected to the first side plate 11a by bonding, clamping or partially embedding in the first side plate 11a, the reinforcement 15 should be a material that cannot react with the electrolyte. Furthermore, when the reinforcement 15 is located on the inner side of the first side plate 11a, the reinforcement 15 can be an insulating member; or, the reinforcement 15 is a non-insulating member made of the same metal material as the tab 42. When the reinforcement 15 is located on the outer side of the first side plate 11b, the reinforcement 15 can be a non-insulating member. When the reinforcement 15 is a non-insulating member that can react with the electrolyte, or when the reinforcement 15 is a non-insulating member made of a different metal material from the tab 42, the reinforcement 15 is completely embedded in the first side plate 11a.

[0070] In an embodiment of the present invention, the reinforcement 15 is one of a metal plate, a ceramic plate or a plastic plate. Specifically, when the metal plate is made of the same metal material as the tab 42, such as an aluminum plate or a copper plate, it can be partially or completely embedded in the first side plate 11a; when the metal plate is made of a different metal material from the tab 42, the metal plate is completely embedded in the first side plate 11a. The ceramic plate is an insulating member, which can be partially or completely embedded in the first side plate 11a. The plastic plate is an insulating member, which can be partially or completely embedded in the first side plate 11a when it is made of a material that cannot react with the electrolyte; when it is made of a material that can react with the electrolyte, it is completely embedded in the first side plate 11a. In the case where the plastic plate is completely embedded in the first side plate 11a, the strength and rigidity of the plastic plate should be greater than the strength and rigidity of the first side plate 11a.

[0071] In this embodiment of the present invention, the reinforcement member 15 and the reinforcement plate 16 are disposed between the two second connecting plates 17 to enhance the strength and rigidity of corresponding areas on the first side plate 11a and the second side plate 11b. Of course, the length of the reinforcement member 15 may be greater than the distance between the two second connecting plates 17, or equivalent to the length of the first side plate 11; the length of the reinforcement plate 16 may also be greater than the distance between the two second connecting plates 17, or equivalent to the length of the second side plate 11b.

[0072] In other embodiments, unlike the reinforcement member 15 connected to the first side plate 11a, a reinforcement rib is provided on one side of the first side plate 11a. The reinforcement rib is provided along the length of the end plate 1 and can be provided on the side of the first side plate 11a close to the second side plate 11b, or on the side of the first side plate 11a away from the second side plate 11b. The reinforcement rib can also enhance the strength and rigidity of the first side plate 11 to prevent the first side plate 11 from bending and deforming during the hot melt process with the insulating film 5, thereby ensuring the normal insertion of the subsequent pole group 4 into the shell. The reinforcement rib is provided between the two second connecting plates 17. Of course, the length of the reinforcement rib can also be greater than the distance between the two second connecting plates 17, or be equivalent to the length of the first side plate 11a.

[0073] 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, characterized in that: include: A housing, comprising a receiving cavity and an opening communicating with the receiving cavity; an electrode group, housed in the accommodating cavity; The end plate 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 and are connected by the bottom plate. An insertion hole is formed between the two side plates. The bottom plate is used to abut against the end surface of the pole group with a pole ear, and the pole ear is inserted into the insertion hole; the end plate is arranged in the opening, the dimension of the opening in the width direction is D, the width of the end plate is W, 0.85D≤W≤(D-0.5mm).

2. The battery according to claim 1, characterized in that The dimension of the opening in the longitudinal direction of the end plate is C, the length of the end plate is L, and 0.97C≤L≤(C-0.5mm).

3. The battery according to claim 1, characterized in that The dimension of the insertion hole in the longitudinal direction of the end plate is at least 2 mm larger than the width of the tab.

4. The battery according to claim 1, characterized in that The bottom plate includes a first plate portion and a second plate portion spaced apart in the longitudinal direction of the end plate, one end of the two side plates is connected by the first plate portion, and the other end is connected by the second plate portion; the through hole is formed between the two side plates, the first plate portion, and the second plate portion; An avoidance groove is provided on the portion of the side plate located between the first plate portion and the second plate portion, the side of the bottom plate that abuts against the end surface is the bottom surface of the end plate, 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.

5. The battery according to any one of claims 1 to 4, characterized in that: The two side plates are respectively a first side plate and a second side plate. The end plate further includes a reinforcing plate connected to a side of the second side plate close to the first side plate and tilted in a direction away from the bottom plate.

6. The battery according to claim 5, characterized in that The included angle between the reinforcing plate and the plane where the bottom plate is located is α, 0°≤α≤75°.

7. The battery according to claim 5, characterized in that A receiving groove is formed between the side of the reinforcing plate away from the bottom plate and the second side plate; the tab is bent and arranged between the two side plates, and the receiving groove is suitable for receiving the bent portion of the tab.

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

9. The battery according to claim 5, characterized in that The end plate further includes a reinforcement member connected to the first side plate and extending along the length direction of the end plate.

10. The battery according to claim 9, characterized in that The reinforcement is bonded, clamped or embedded in the first side panel.

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