Battery cover plate and battery

Abstract

The utility model belongs to battery technical field discloses a battery cover plate and battery, this battery cover plate includes first insulating piece, sealing piece, cover plate subassembly and material quality different first pole body and second pole body, cover plate subassembly includes cover plate body and connecting ring, cover plate body is provided with first containing recess, connecting ring is provided with second containing recess, first containing recess and second containing recess jointly constitute pole mounting groove, first pole body includes first plug -in part and first limit portion, second pole body includes second plug -in part and second limit portion, first limit portion and second limit portion all are located in pole mounting groove, first limit portion and cover plate body between being equipped with the first insulating piece of being compressed, second limit portion and connecting ring between being equipped with the sealing piece of being compressed. Make originally pull the force of combination surface, become the force of extrusion combination surface, reduced the probability of fracture at the combination surface, improved the reliability of product, prolonged the life.

Description

Technical Field

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

[0002] The electrode assembly achieves electrical connection by laser welding the tabs and terminals, thereby leading the internal current of the cell to the outside of the casing. The positive terminal connected to the positive tab is generally made of pure aluminum, while the negative terminal connected to the negative tab is generally made of pure copper. However, since copper is more expensive and heavier than aluminum, using pure copper as the negative terminal not only increases production costs but also adds to the overall weight of the lithium-ion battery, which does not conform to the principle of lightweight structural design.

[0003] Therefore, in order to reduce weight and lower costs, copper-aluminum composite materials are usually used to prepare negative electrode posts. That is, copper is used to make the base plate of the negative electrode post, and aluminum is used to make the main body of the negative electrode post. In order to prevent electrolyte leakage, a sealing element is usually fitted on the outside of the main body of the electrode post. The sealing element is compressed by the base plate and the cover plate to achieve a seal.

[0004] However, when the seal is compressed, it exerts a force that moves away from each other on the cover plate and the base plate of the electrode. Since the electrode body is connected to the cover plate, and the negative electrode is composed of an electrode body and a base plate made of different materials, the force exerted by the seal on the cover plate and the base plate of the electrode will cause the copper-aluminum joint surface between the electrode body and the base plate to be pulled, resulting in damage to the copper-aluminum joint surface. This can easily lead to the negative electrode breaking at the copper-aluminum joint surface, reducing the reliability of the product and shortening its service life. Utility Model Content

[0005] The purpose of this invention is to provide a battery cover and battery that adjusts the direction of the force acting on the terminals made of different materials at the joint surface, thereby reducing the probability of the terminals breaking at the joint surface, improving product reliability, and extending product lifespan.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On the one hand, a battery cover is provided, the battery cover including a first insulating element, a sealing element, a cover assembly, and a first electrode post and a second electrode post made of different materials;

[0008] The cover plate assembly includes a cover plate body and a connecting ring. The cover plate body has a first receiving groove and a first pole post through hole communicating with the first receiving groove. The connecting ring has a second receiving groove and a second pole post through hole communicating with the second receiving groove. The connecting ring is disposed in the first receiving groove. The first receiving groove and the second receiving groove together form a pole post mounting groove.

[0009] The first pole piece includes a first insertion part and a first limiting part. The first limiting part is disposed on the side of the first insertion part facing the second pole piece, and the first insertion part is inserted into the through hole of the first pole piece.

[0010] The second pole piece includes a second insertion part and a second limiting part. The second limiting part is disposed on the side of the second insertion part facing the first pole piece. The first limiting part abuts against the second limiting part and a mating surface is formed between the first limiting part and the second limiting part. The second insertion part is inserted into the through hole of the second pole piece. The first limiting part and the second limiting part are both located in the pole piece mounting groove. The first limiting part and the cover plate body are provided with a compressed first insulating member in the gap along the first direction. The second limiting part and the connecting ring are provided with a compressed sealing member in the gap along the first direction.

[0011] Optionally, the connecting ring includes a fixing part, a middle part, and a connecting part. The second pole post through hole is formed on the fixing part. The middle part is continuously arranged around the circumferential edge of the fixing part away from the second pole post through hole. The middle part extends away from the fixing part in a direction away from the first pole post to form the connecting part. The connecting part is accommodated in the first receiving groove and welded to the cover plate body.

[0012] Optionally, the thickness of the fixing part along the first direction is a, and satisfies 0.8mm≤a≤1.5mm.

[0013] Optionally, the thickness of the cover plate body along the first direction is T, and the thickness of the connecting part is b, and (Tb)≥0.8mm.

[0014] Optionally, the length of the connecting part along the second direction is L, and satisfies 1.5mm≤L≤3mm.

[0015] Optionally, the first insulating member includes a first insulating part and a second insulating part, the second insulating part is disposed on the side of the first insulating part away from the second pole body, and the first insulating member also has a first insertion through hole penetrating the first insulating part and the second insulating part, the first insulating part is disposed between the cover plate body and the first limiting part, and the first insertion part is inserted into the first insertion through hole.

[0016] Optionally, the sealing element includes a first sealing portion, a second sealing portion, and a third sealing portion. The first sealing portion is disposed between the fixing portion and the second limiting portion. The second sealing portion is disposed on the side of the first sealing portion away from the first pole piece. The sealing element also has a second insertion through hole that penetrates the first sealing portion and the second sealing portion and is inserted into the second insertion portion. The third sealing portion is disposed on the side of the first sealing portion facing the first pole piece. The sealing element also has a third insertion through hole that penetrates the first sealing portion and the third sealing portion and is inserted into the second limiting portion. The second insertion through hole communicates with the third insertion through hole.

[0017] Optionally, the distance between the surface of the second insulating portion away from the first insulating portion and the surface of the first plug portion away from the first limiting portion along the first direction is c, and satisfies 0.2mm≤c≤0.5mm.

[0018] Optionally, the battery cover further includes a second insulating member, which is disposed on the side of the cover body away from the first insulating member and covers the outer side of the cover body and the connecting ring. One of the second insulating member and the cover body is provided with a connecting groove, and the other of the second insulating member and the cover body is provided with a connecting protrusion connected to the connecting groove.

[0019] The second insulating member covering the outside of the fixing part has a spacing dimension d along the first direction between its surface away from the fixing part and the surface of the second plug-in part away from the second limiting part, and satisfies 0.2mm≤d≤1mm.

[0020] On the other hand, a battery is provided, the battery including an electrode assembly, a battery housing, and a battery cover as described in any of the preceding claims, the battery housing being a hollow housing structure having at least one opening, and the battery cover being disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for accommodating the electrode assembly.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides a battery cover plate, which includes a first insulating element, a sealing element, a cover plate assembly, and a first and second electrode post made of different materials. A connecting ring is connected to a first receiving groove in the cover plate body, such that the first receiving groove and the second receiving groove of the connecting ring together form an electrode post mounting groove. The first limiting part of the first electrode post and the second limiting part of the second electrode post are both disposed within the electrode post mounting groove, such that the mating surface between the first and second limiting parts is located within the electrode post mounting groove. Then, the compressed first insulating element is disposed along the first direction between the cover plate body and the first limiting part. Within the gap in the first direction, the compressed sealing element is placed within the gap between the second limiting part and the connecting ring. This causes the compressed first insulating element to exert a force on the first limiting part to compress the second limiting part, and the compressed sealing element to exert a force on the second limiting part to compress the first limiting part. This transforms the force that originally pulled the joint surface into a force that compresses the joint surface, making the first pole piece and the second pole piece more tightly bonded at the joint surface. This reduces the probability of the first pole piece and the second pole piece breaking at the joint surface, improves the reliability of the product, and extends the service life of the product.

[0023] This utility model also provides a battery that, by applying the aforementioned battery cover plate, overcomes the problem that terminals made of different materials are prone to breakage at the joint surface, thereby improving product quality. Attached Figure Description

[0024] Figure 1 This is an exploded view of the battery cover provided by this utility model;

[0025] Figure 2 This is a partial structural cross-sectional view of the battery cover provided by this utility model;

[0026] Figure 3 yes Figure 2 Enlarged view of the structure of section I;

[0027] Figure 4 yes Figure 2 Enlarged view of the structure of section J in the middle;

[0028] Figure 5 This is a partial structural cross-sectional view of the cover plate assembly in the battery cover plate provided by this utility model;

[0029] Figure 6 This is a partial structural cross-sectional view of the cover body in the battery cover provided by this utility model;

[0030] Figure 7 This is a partial structural cross-sectional view of the connecting ring in the battery cover provided by this utility model;

[0031] Figure 8This is a cross-sectional view of the structure of the first insulating component in the battery cover provided by this utility model;

[0032] Figure 9 This is a cross-sectional view of the sealing element in the battery cover provided by this utility model.

[0033] In the picture:

[0034] 1. First insulating element; 11. First insulating part; 12. Second insulating part; 13. First insertion through hole;

[0035] 2. Sealing element; 21. First sealing part; 22. Second sealing part; 23. Third sealing part; 24. Second insertion through hole; 25. Third insertion through hole;

[0036] 3. Cover plate assembly; 31. Cover plate body; 311. First receiving groove; 312. First pole post through hole; 313. Connecting groove; 32. Connecting ring; 321. Second receiving groove; 322. Second pole post through hole; 323. Fixing part; 324. Middle part; 325. Connecting part; 33. Pole post mounting groove;

[0037] 4. First pole piece; 41. First insertion part; 42. First limiting part;

[0038] 5. Second pole piece; 51. Second insertion part; 52. Second limiting part;

[0039] 6. Second insulating component; 61. Connecting protrusion. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] Traditional battery covers, when using copper-aluminum composite terminals, typically have a sealing element fitted on the outside of the terminal body. The sealing is achieved by compressing the sealing element using the terminal base plate and the cover plate. When the terminal body and terminal base plate are made of different materials, the sealing element used for sealing can be stretched after being compressed, causing damage to the copper-aluminum interface between the terminal body and the terminal base plate. This can easily lead to the negative terminal breaking at the copper-aluminum interface, reducing product reliability and shortening product lifespan.

[0045] Therefore, in order to avoid the compressed seal exerting a pulling force on the electrode joint surface of the electrode made of different materials, reduce the probability of the electrode breaking at the joint surface, improve the reliability of the product, and extend the service life of the product, this embodiment provides a battery cover plate. For ease of description, the thickness direction of the battery cover plate is defined as the first direction, and the length direction of the battery cover plate is defined as the second direction.

[0046] like Figures 1 to 9As shown, the battery cover includes a first insulating component 1, a sealing component 2, a cover assembly 3, and a first electrode post 4 and a second electrode post 5 made of different materials. The cover assembly 3 includes a cover body 31 and a connecting ring 32. The cover body 31 has a first receiving groove 311 and a first electrode post through hole 312 communicating with the first receiving groove 311. The connecting ring 32 has a second receiving groove 321 and a second electrode post through hole 322 communicating with the second receiving groove 321. The connecting ring 32 is disposed in the first receiving groove 311. The first receiving groove 311 and the second receiving groove 321 together form an electrode post mounting groove 33. The first electrode post 4 includes a first insertion part 41 and a first limiting part 42. The first limiting part 42 is disposed in the first insertion part 41 facing towards the first limiting part 41. On one side of the second pole post 5, the first insertion part 41 is inserted into the first pole post through hole 312. The second pole post 5 includes a second insertion part 51 and a second limiting part 52. The second limiting part 52 is located on the side of the second insertion part 51 facing the first pole post 4. The first limiting part 42 abuts against the second limiting part 52 and a mating surface is formed between the first limiting part 42 and the second limiting part 52. The second insertion part 51 is inserted into the second pole post through hole 322. The first limiting part 42 and the second limiting part 52 are both located in the pole post mounting groove 33. A compressed first insulating member 1 is provided in the gap between the first limiting part 42 and the cover plate body 31 along the first direction. A compressed sealing member 2 is provided in the gap between the second limiting part 52 and the connecting ring 32 along the first direction.

[0047] In this embodiment, the first electrode post 4 is made of aluminum and the second electrode post 5 is made of copper. Therefore, the bonding surface between the first electrode post 4 and the second electrode post 5 is a copper-aluminum bonding surface. The first electrode post 4, made of aluminum, is used to weld with the welding tab, and the second electrode post 5, made of copper, is used to weld with the electrode tab. Since the copper-aluminum composite electrode post aims to reduce the weight and manufacturing cost of the pure copper negative electrode post, in this embodiment, the first electrode post 4 and the second electrode post 5 together constitute the negative electrode post. Depending on the distribution of the negative and positive electrode posts, different types of batteries can be adapted, such as blade batteries or prismatic batteries. When the negative and positive electrode posts are on the same side, it is adapted to prismatic batteries; when the negative and positive electrode posts are on opposite sides, it is adapted to blade batteries.

[0048] In this embodiment, the sealing element 2 used to achieve the seal is commonly made of materials including rubber, silicone, and polytetrafluoroethylene (PTFE). These materials have good elasticity and corrosion resistance, effectively preventing electrolyte leakage inside the battery and ensuring safe battery use. Common insulating materials used in batteries mainly include plastics, rubber, fiberglass, and ceramics. In this embodiment, the first insulating element 1 is a plastic component.

[0049] Optionally, such as Figure 7As shown, the connecting ring 32 includes a fixing part 323, a middle part 324 and a connecting part 325. The second pole post through hole 322 is opened on the fixing part 323. The middle part 324 is continuously arranged around the circumferential edge of the fixing part 323 away from the second pole post through hole 322. The middle part 324 extends in a direction away from the fixing part 323 to form the connecting part 325. The connecting part 325 is accommodated in the first receiving groove 311 and welded to the cover plate body 31. By providing a connecting ring 32 consisting of a fixing part 323, an intermediate part 324, and a connecting part 325, it is convenient to form a pole post mounting groove 33 with the cover plate body 31 to accommodate the first limiting part 42 and the second limiting part 52. After the first insulating member 1 and the sealing member 2 are compressed, the pole post mounting groove 33 can generate a force that squeezes the first limiting part 42 and the second limiting part 52 against each other, making the first pole post 4 and the second pole post 5 more tightly connected, reducing the probability of the first pole post 4 and the second pole post 5 breaking at the joint surface, improving the reliability of the product, and extending the service life of the product.

[0050] In this embodiment, the fixing part 323, the intermediate part 324 and the connecting part 325 constitute a connecting ring 32 with a Z-shaped cross-section on one side. The connecting ring 32 is manufactured by an integral molding process. In order to ensure the structural strength after the connecting ring 32 is welded to the cover plate body 31, the connecting ring 32 and the cover plate body 31 are made of the same material, which is aluminum.

[0051] Optionally, such as Figure 5 , Figure 7 As shown, the thickness of the fixing part 323 along the first direction is 'a', and it satisfies 0.8mm ≤ a ≤ 1.5mm. By limiting the thickness 'a' of the fixing part 323 along the first direction, on the one hand, the thickness of the fixing part 323 is avoided from being too small, ensuring that the fixing part 323 has sufficient material thickness to ensure that the fixing part 323 has sufficient structural strength and avoids bending deformation under stress. On the other hand, the thickness of the fixing part 323 is avoided from being too large, resulting in design overkill, which would increase the overall size of the battery cover and lead to a large space occupation.

[0052] The thickness dimension a of the fixing part 323 along the first direction can be any value between 0.8mm ≤ a ≤ 1.5mm or any range between two values, such as 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.

[0053] Optionally, such as Figure 5As shown, the thickness of the cover plate body 31 along the first direction is T, and the thickness of the connecting part 325 is b, and (Tb) ≥ 0.8 mm. Since the thickness of the cover plate body 31 along the first direction is T and the thickness of the connecting part 325 is b, the relationship (Tb) actually represents the remaining material thickness after the cover plate body 31 has the first receiving groove 311 formed. By limiting the relationship (Tb) to satisfy (Tb) ≥ 0.8 mm, it avoids the remaining material thickness of the cover plate body 31 after the first receiving groove 311 is too small, resulting in insufficient structural strength and preventing bending deformation of the area where the cover plate body 31 has the first receiving groove 311.

[0054] Optionally, such as Figure 2 As shown, the length of the connecting part 325 along the second direction is L, and it satisfies 1.5mm≤L≤3mm. Since the assembly of the sealing element 2 and the first insulating element 1 is completed when the connecting part 325 is welded to the cover plate body 31, limiting the length L of the connecting part 325 along the second direction to satisfy 1.5mm≤L≤3mm avoids the welding area from being too close to the first insulating element 1 and the sealing element 2, which could cause the first insulating element 1 and the sealing element 2 to deform due to heat, resulting in insulation failure and sealing failure. On the other hand, it avoids the connecting part 325 from being too long, thus avoiding material waste.

[0055] Optionally, such as Figure 8 As shown, the first insulating member 1 includes a first insulating portion 11 and a second insulating portion 12. The second insulating portion 12 is disposed on the side of the first insulating portion 11 facing away from the second pole piece 5. The first insulating member 1 also has a first insertion through hole 13 penetrating the first insulating portion 11 and the second insulating portion 12. The first insulating portion 11 is disposed between the cover plate body 31 and the first limiting portion 42, and the first insertion portion 41 is inserted into the first insertion through hole 13. By using the first insulating member 1 composed of the first insulating portion 11 and the second insulating portion 12, the first insulating member 1 can both isolate the cover plate body 31 and the first pole piece 4 through the first insulating portion 11 and the second insulating portion 12, avoiding direct contact and short circuit between the two, and can also apply a force to the first limiting portion 42 by compressing the first insulating portion 11 to compress the second limiting portion 52. In this embodiment, the first insulating member 1 is manufactured by injection molding.

[0056] Optionally, such as Figure 9As shown, the sealing member 2 includes a first sealing part 21, a second sealing part 22, and a third sealing part 23. The first sealing part 21 is disposed between the fixing part 323 and the second limiting part 52. The second sealing part 22 is disposed on the side of the first sealing part 21 away from the first pole post 4. The sealing member 2 also has a second insertion through hole 24 that penetrates the first sealing part 21 and the second sealing part 22 and is inserted into the second insertion part 51. The third sealing part 23 is disposed on the side of the first sealing part 21 facing the first pole post 4. The sealing member 2 also has a third insertion through hole 25 that penetrates the first sealing part 21 and the third sealing part 23 and is inserted into the second limiting part 52. The second insertion through hole 24 and the third insertion through hole 25 are connected. By employing a sealing element 2 composed of a first sealing part 21, a second sealing part 22, and a third sealing part 23, the sealing element 2 achieves excellent sealing performance by providing a triple seal through the first sealing part 21, the second sealing part 22, and the third sealing part 23, preventing electrolyte leakage. Furthermore, by compressing the first sealing part 21, a force is applied to the second limiting part 52 to compress the first limiting part 42. In this embodiment, the sealing element 2 is manufactured using an injection molding process.

[0057] Optionally, such as Figure 2 , Figure 3 As shown, the distance between the surface of the second insulating part 12 facing away from the first insulating part 11 and the surface of the first plug-in part 41 facing away from the first limiting part 42 along the first direction is c, and satisfies 0.2mm≤c≤0.5mm. By limiting the distance c along the first direction between the surface of the second insulating part 12 facing away from the first insulating part 11 and the surface of the first plug-in part 41 facing away from the first limiting part 42, so that it satisfies 0.2mm≤c≤0.5mm, on the one hand, it avoids the problem that the first electrode post 4 is too close to the second insulating part 12 when welding the welding bar, which would cause the second insulating part 12 to melt due to heat and lead to insulation failure. On the other hand, it avoids that too much area of ​​the first electrode post 4 is exposed, which would cause the fixture to easily scrape the outer peripheral surface of the first electrode post 4 during the cell manufacturing process, generating metal wires, which would cause the first electrode post 4 to overlap with the cover plate body 31 and cause a short circuit.

[0058] The distance c between the surface of the second insulating part 12 facing away from the first insulating part 11 and the surface of the first plug-in part 41 facing away from the first limiting part 42 along the first direction can be any value between 0.2mm≤c≤0.5mm or any range between two values, such as 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc.

[0059] Optionally, such as Figure 2 , Figure 6As shown, the battery cover also includes a second insulating member 6. The second insulating member 6 is located on the side of the cover body 31 away from the first insulating member 1 and covers the outer side of the cover body 31 and the connecting ring 32. One of the second insulating member 6 and the cover body 31 has a connecting groove 313, and the other of the second insulating member 6 and the cover body 31 has a connecting protrusion 61 that connects to the connecting groove 313. By providing the second insulating member 6 on the side of the cover body 31 away from the first insulating member 1 and covering the outer side of the cover body 31 and the connecting ring 32, the cover body 31 and the connecting ring 32 are insulated and protected, preventing the electrode from directly contacting the cover body 31 or the connecting ring 32 and causing a short circuit when welding with the electrode tab. Furthermore, by providing the connecting groove 313 in one of the second insulating member 6 and the cover body 31, and the connecting protrusion 61 that connects to the connecting groove 313 in the other of the second insulating member 6 and the cover body 31, the firmness of the connection between the two is ensured, preventing the second insulating member 6 from falling off the cover body 31.

[0060] In this embodiment, since the thickness of the second insulating member 6 is thinner than the thickness of the cover plate body 31, a connecting groove 313 is formed on the cover plate body 31, and a connecting protrusion 61 is disposed on the second insulating member 6. The second insulating member 6 is fixedly connected to the cover plate body 31 by heat fusion. In addition, to further improve the connection strength, the connecting groove 313 is a dovetail groove, and the cross-section of the connecting protrusion 61 is trapezoidal, thereby making the structural strength of the connecting protrusion 61 after being connected to the connecting groove 313 higher.

[0061] Optionally, such as Figure 2 , Figure 4 As shown, the second insulating member 6, which covers the outside of the fixing part 323, has a distance d along the first direction between its surface away from the fixing part 323 and the surface of the second insertion part 51 away from the second limiting part 52, satisfying 0.2mm≤d≤1mm. By limiting the distance d along the first direction between the surface of the second insulating member 6 covering the outside of the fixing part 323 and the surface of the second insertion part 51 away from the second limiting part 52, satisfying 0.2mm≤d≤1mm, this avoids two problems: firstly, the distance d is too small, which would cause the second insulating member 6 to be too close to the electrode lug during welding, leading to the second insulating member 6 melting due to heat and causing insulation failure; secondly, the distance d is too large, which would increase the exposed area of ​​the second electrode lug 5, resulting in poor insulation protection.

[0062] In this embodiment, a battery is also provided, comprising an electrode assembly, a battery casing, and the aforementioned battery cover. The battery casing is a hollow casing structure with at least one opening. The battery cover is disposed at the opening of the battery casing, closing the battery casing to form a cavity for accommodating the electrode assembly. By applying the aforementioned battery cover, this battery overcomes the problem that electrode posts made of different materials are prone to breakage at the joint surface, thus improving product quality.

[0063] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery cover plate, characterized by The battery cover includes a first insulating component, a sealing component, a cover assembly, and a first and second electrode post made of different materials; The cover plate assembly includes a cover plate body and a connecting ring. The cover plate body has a first receiving groove and a first pole post through hole communicating with the first receiving groove. The connecting ring has a second receiving groove and a second pole post through hole communicating with the second receiving groove. The connecting ring is disposed in the first receiving groove. The first receiving groove and the second receiving groove together form a pole post mounting groove. The first pole piece includes a first insertion part and a first limiting part. The first limiting part is disposed on the side of the first insertion part facing the second pole piece, and the first insertion part is inserted into the through hole of the first pole piece. The second pole piece includes a second insertion part and a second limiting part. The second limiting part is disposed on the side of the second insertion part facing the first pole piece. The first limiting part abuts against the second limiting part and a mating surface is formed between the first limiting part and the second limiting part. The second insertion part is inserted into the through hole of the second pole piece. The first limiting part and the second limiting part are both located in the pole piece mounting groove. The first limiting part and the cover plate body are provided with a compressed first insulating member in the gap along the first direction. The second limiting part and the connecting ring are provided with a compressed sealing member in the gap along the first direction.

2. The battery cover plate of claim 1, wherein, The connecting ring includes a fixing part, a middle part, and a connecting part. The second pole post through hole is opened on the fixing part. The middle part is continuously arranged around the circumferential edge of the fixing part away from the second pole post through hole. The middle part extends away from the fixing part in a direction away from the first pole post to form the connecting part. The connecting part is accommodated in the first receiving groove and welded to the cover plate body.

3. The battery cover according to claim 2, characterized in that, The thickness of the fixing part along the first direction is a, and satisfies 0.8mm≤a≤1.5mm.

4. The battery cover according to claim 2, characterized in that, The thickness of the cover plate body along the first direction is T, and the thickness of the connecting part is b, and (Tb)≥0.8mm.

5. The battery cover according to claim 2, characterized in that, The length of the connecting part along the second direction is L, and it satisfies 1.5mm≤L≤3mm.

6. The battery cover according to claim 2, characterized in that, The first insulating member includes a first insulating part and a second insulating part. The second insulating part is disposed on the side of the first insulating part away from the second pole body. The first insulating member also has a first insertion through hole that penetrates the first insulating part and the second insulating part. The first insulating part is disposed between the cover plate body and the first limiting part. The first insertion part is inserted into the first insertion through hole.

7. The battery cover according to claim 2, characterized in that, The sealing element includes a first sealing part, a second sealing part, and a third sealing part. The first sealing part is disposed between the fixed part and the second limiting part. The second sealing part is disposed on the side of the first sealing part away from the first pole piece. The sealing element also has a second insertion through hole that penetrates the first sealing part and the second sealing part and is inserted into the second insertion part. The third sealing part is disposed on the side of the first sealing part facing the first pole piece. The sealing element also has a third insertion through hole that penetrates the first sealing part and the third sealing part and is inserted into the second limiting part. The second insertion through hole communicates with the third insertion through hole.

8. The battery cover according to claim 6, characterized in that, The distance between the surface of the second insulating part away from the first insulating part and the surface of the first plug-in part away from the first limiting part along the first direction is c, and satisfies 0.2mm≤c≤0.5mm.

9. The battery cover according to claim 2, characterized in that, The battery cover also includes a second insulating member, which is disposed on the side of the cover body away from the first insulating member and covers the outer side of the cover body and the connecting ring. One of the second insulating member and the cover body is provided with a connecting groove, and the other of the second insulating member and the cover body is provided with a connecting protrusion that connects to the connecting groove. The second insulating member covering the outside of the fixing part has a spacing dimension d along the first direction between its surface away from the fixing part and the surface of the second plug-in part away from the second limiting part, and satisfies 0.2mm≤d≤1mm.

10. A battery, characterized in that, The battery includes an electrode assembly, a battery housing, and a battery cover as described in any one of claims 1-9. The battery housing is a hollow housing structure with at least one opening. The battery cover is disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for accommodating the electrode assembly.

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