Combined battery cover plate and battery

Abstract

In order to solve the problem that a sealing ring of a combined battery cover plate in the prior art is easy to fail in sealing, the utility model provides a combined battery cover plate and a battery, the combined battery cover plate comprises a first insulating part, a cover plate, a second insulating part, a pole component and a sealing ring, the first insulating part is connected between one end, used for external connection, of the pole assembly and one side of the cover plate in an insulating manner; the second insulating part is connected between the other end of the pole assembly and the other side of the cover plate in an insulating manner; the two axial ends of the sealing ring are attached to the first insulating part and the second insulating part respectively. The inner periphery of the sealing ring is attached to the outer periphery of the pole assembly, and the outer periphery of the sealing ring is attached to the cover plate; the peripheral size of the sealing ring is gradually increased from one end of the sealing ring to the other end of the sealing ring. According to the combined type battery cover plate provided by the utility model, the overall sealing reliability and the assembling strength of the combined type battery cover plate are improved and the service life of the combined type battery cover plate is prolonged by adjusting the assembling position of the sealing ring in the combined type battery cover plate and the shape of the sealing ring.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a combined battery cover plate and a battery. Background Art

[0002] In recent years, lithium-ion batteries have been widely used in fields such as electric vehicles, backup power systems, and microgrid energy storage systems due to their advantages of high energy density and long life. The main structure of a lithium battery includes a housing, a pole core provided in the housing, and a combined battery cover plate covering the top of the housing. The combined battery cover plate generally consists of positive / negative pole columns, positive / negative electrode plates, upper plastic parts, lower plastic parts, sealing rings, cover plates, etc. The assembly process of the combined battery cover plate is generally that the pole column passes through the lower plastic part, the sealing ring, the cover plate, and the upper plastic part from bottom to top and then is welded to the electrode plate. The outer peripheral dimension of one end to the other end of the sealing ring is equal, and a higher and larger sealing ring is required to ensure sealing, increasing the cost. After long-term use of the battery, it is easy to leak liquid due to sealing failure, affecting the battery life. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a combined battery cover plate and a battery for the problem that the sealing ring of the combined battery cover plate in the prior art is prone to sealing failure.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows:

[0005] Provide a combined battery cover plate, including a first insulating part, a cover plate, a second insulating part, a pole column assembly, and a sealing ring;

[0006] The pole column assembly passes through the first insulating part, the cover plate, the second insulating part, and the sealing ring;

[0007] The first insulating part is insulatingly connected between one end of the pole column assembly for external connection and one side of the cover plate; the second insulating part is insulatingly connected between the other end of the pole column assembly and the other side of the cover plate;

[0008] Axial ends of the sealing ring respectively fit the first insulating part and the second insulating part; the inner circumference of the sealing ring fits the outer circumference of the pole column assembly, and the outer circumference of the sealing ring fits the cover plate;

[0009] The outer peripheral dimension of the sealing ring gradually increases from one end of the sealing ring to the other end.

[0010] Optionally, the outer peripheral dimension of one end of the sealing ring close to the first insulating part is smaller than the outer peripheral dimension of one end of the sealing ring close to the second insulating part; or,

[0011] The outer peripheral dimension of one end of the sealing ring close to the first insulating member is larger than the outer peripheral dimension of the end of the sealing ring close to the second insulating member.

[0012] Optionally, the sealing ring is a conical sealing ring.

[0013] Optionally, an angle is formed between the inner circumference and the outer circumference of the sealing ring, and the angle α of the angle is 15° to 45°.

[0014] Optionally, the height H of the sealing ring is 1.0 mm to 3.5 mm.

[0015] Optionally, the thickness H1 of the end of the smaller end of the sealing ring in the direction perpendicular to the axis of the pole assembly is 0.5 mm to 3 mm.

[0016] Optionally, the pole assembly includes a pole and a pressing plate. The pole includes a first cylinder, a second cylinder, and a third cylinder connected in sequence. The second cylinder is connected between the first cylinder and the third cylinder. The surface of the first cylinder away from the second cylinder protrudes from the surface of the first insulating member. The pressing plate is sleeved on the outer circumference of the third cylinder;

[0017] The second insulating member is insulatingly connected between the pressing plate and the cover plate;

[0018] The pressing plate is fixedly connected to the third cylinder, and the pressing plate and the first cylinder cooperate to clamp the first insulating member, the cover plate, and the second insulating member.

[0019] Optionally, the cover plate is provided with a first mounting hole and a first limiting groove. The first limiting groove penetrates through one side of the cover plate facing the second insulating member; One end of the first mounting hole penetrates through one side of the cover plate facing the first insulating member, and the other end of the first mounting hole penetrates through to the first limiting groove;

[0020] The second insulating member is provided with a convex platform, and the first limiting groove and the convex platform are mutually engaged;

[0021] A second limiting groove is provided on the side of the convex platform facing away from the cover plate, and the pressing plate is fitted into the second limiting groove;

[0022] A second mounting hole is provided on the convex platform;

[0023] The second cylinder passes through the first mounting hole and the second mounting hole; The outer circumference of the sealing ring fits the inner wall of the first mounting hole.

[0024] Optionally, the convex platform and the pressing plate have a square outer peripheral contour, and the first limiting groove and the second limiting groove have a square inner peripheral contour.

[0025] Optionally, the outer peripheral dimension of the first cylinder is greater than that of the second cylinder, and the outer peripheral dimension of the second cylinder is greater than that of the third cylinder;

[0026] A first mounting hole is provided on the cover plate, and the second cylinder passes through the first mounting hole; the outer periphery of the sealing ring fits the inner wall of the first mounting hole, and the inner periphery fits the second cylinder;

[0027] The inner wall of the first mounting hole is located inside the extension plane of the outer peripheral surface of the first cylinder;

[0028] Along the thickness direction of the cover plate, the pressing plate faces the cover plate, the part of the first cylinder protruding from the outer periphery of the second cylinder, and the part of the second cylinder protruding from the outer periphery of the third cylinder.

[0029] Optionally, the minimum distance between the inner wall of the first mounting hole and the extension plane of the outer peripheral surface of the first cylinder is W1, and W1 is 0.5 to 3 mm;

[0030] The distance between the outer wall of the pressing plate and the extension plane of the outer peripheral surface of the first cylinder is W2, and W2 is 0 to 2 mm.

[0031] On the other hand, the present application provides a battery including the combined battery cover plate described above.

[0032] The beneficial effects of the present utility model are as follows:

[0033] The combined battery cover plate provided by the present utility model includes a first insulating member, a cover plate, a second insulating member, a pole column assembly and a sealing ring. At both axial ends of the sealing ring, the first insulating member and the second insulating member are hermetically connected respectively. This setting enables both ends of the sealing ring to be connected to the first insulating member and the second insulating member respectively, avoiding damage to the sealing ring caused by welding other electrical connection structural members. In addition, the outer peripheral dimension of the sealing ring gradually increases from one end to the other end of the sealing ring. During the assembly process of the pole column assembly, after the pole column assembly passes through the sealing ring, the inner periphery of the sealing ring fits the outer periphery of the pole column assembly, and the outer periphery of the sealing ring fits the cover plate, making the sealing ring fit more closely with the side surfaces of the cover plate and the pole column assembly, and the sealing performance is more reliable, which is beneficial to further improving the overall sealing performance and connection strength of the combined battery cover plate. That is, the combined battery cover plate provided by the present application improves the overall assembly strength of the combined battery cover plate by adjusting the assembly position of the sealing ring in the combined battery cover plate and the shape of the sealing ring. Description of the Drawings

[0034] Figure 1 is the front view of the combined battery cover plate provided by the present utility model;

[0035] Figure 2 is the exploded view of the combined battery cover plate provided by the present utility model;

[0036] Figure 3 is the schematic cross-sectional structure view of the combined battery cover plate provided by the present utility model;

[0037] Figure 4 is Figure 3 the enlarged view at position A in

[0038] Figure 5 is the schematic structure view of the sealing ring provided by the present utility model;

[0039] Figure 6 is the schematic cross-sectional structure view of the sealing ring provided by the present utility model;

[0040] Figure 7 is the schematic three-dimensional structure view of the cover plate provided by the present utility model;

[0041] Figure 8 is the schematic three-dimensional structure view of the second insulating part provided by the present utility model.

[0042] The reference numerals in the attached drawings of the specification are as follows:

[0043] 1, the first insulating part; 2, the cover plate; 21, the first mounting hole; 22, the first limiting groove; 3, the second insulating part; 31, the second mounting hole; 32, the boss; 33, the second limiting groove; 4, the pole column assembly; 41, the pole column; 411, the first column body; 412, the second column body; 413, the third column body; 42, the pressing plate; 5, the sealing ring; 6, the liquid injection port; 7, the explosion-proof valve; 100, the combined battery cover plate. Specific embodiments

[0044] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0045] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0046] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0047] Referring Figures 1 - 4 , an embodiment of the present utility model provides a combined battery cover 100, which includes a first insulating member 1, a cover plate 2, a second insulating member 3, a terminal assembly 4, and a sealing ring 5;

[0048] The terminal assembly 4 passes through the first insulating member 1, the cover plate 2, the second insulating member 3, and the sealing ring 5;

[0049] The first insulating member 1 is insulatingly connected between one end of the terminal assembly 4 for external connection and one side of the cover plate 2; the second insulating member 3 is insulatingly connected between the other end of the terminal assembly 4 and the other side of the cover plate 2; the first insulating member 1 is located outside the cover plate 2, and the second insulating member 3 is located inside the cover plate 2. When the combined battery cover 100 is applied to a battery, the outside of the cover plate 2 is exposed outside the battery, and the inside of the cover plate 2 faces the inner cavity of the battery; the first insulating member 1 and the second insulating member 3 achieve insulation between the terminal assembly 4 and the cover plate 2, avoiding short circuits;

[0050] Axial ends of the sealing ring 5 are respectively in contact with the first insulating member 1 and the second insulating member 3; the inner circumference of the sealing ring 5 is in contact with the outer circumference of the terminal assembly 4, and the outer circumference of the sealing ring 5 is in contact with the cover plate 2;

[0051] The outer circumference dimension of the sealing ring 5 gradually increases from one end of the sealing ring 5 to the other end.

[0052] The combined battery cover plate 100 provided by the present utility model has an outer peripheral dimension of the sealing ring 5 gradually increasing from one end to the other end. On the one hand, when assembling the combined battery cover plate 100, the first insulating member 1, the second insulating member 3, and the cover plate 2 will all squeeze the sealing ring 5, and the sealing ring can be better deformed to closely fit the first insulating member 1, the second insulating member 3, the pole assembly 4, and the cover plate 2, improving the sealing reliability. On the other hand, the sealing surface between the outer periphery of the sealing ring 5 and the cover plate 2 does not extend linearly in a direction perpendicular to the cover plate, achieving a better sealing effect; at both axial ends of the sealing ring 5, they are respectively in contact with the first insulating member 1 and the second insulating member 3, rather than in contact with the pole assembly 4, reducing the axial dimension of the sealing ring 5, reducing the material usage of the sealing ring 5, and being beneficial to cost reduction; the end of the second insulating member 3 is in contact with the sealing ring 5, rather than the side of the sealing ring 5, which is equivalent to reducing the through-hole size of the second insulating member 3 for the pole assembly 4 to pass through, increasing the area of the relative regions of the second insulating member 3, the first insulating member 1, and the pole assembly 4 in the thickness direction of the cover plate 2, and being beneficial to improving the strength of the pole installation area of the combined battery cover plate 100; that is, by adjusting the assembly position of the sealing ring in the combined battery cover plate and the shape of the sealing ring, the overall sealing reliability, assembly strength, and service life of the combined battery cover plate are improved.

[0053] In an embodiment, the outer peripheral dimension of one end of the sealing ring 5 close to the first insulating member 1 is smaller than the outer peripheral dimension of one end of the sealing ring 5 close to the second insulating member 3; or, the outer peripheral dimension of one end of the sealing ring 5 close to the first insulating member 1 is larger than the outer peripheral dimension of one end of the sealing ring 5 close to the second insulating member 3.

[0054] Refer to Figure 5 , in an embodiment, the sealing ring 5 is a conical sealing ring.

[0055] Specifically, the cross-sectional shape of the conical sealing ring is the same as the cross-sectional shape of a section on the pole assembly 4 for cooperating with the sealing ring 5; for example:

[0056] A section of the pole assembly 4 cooperating with the sealing ring 5 is a square column section, and the conical sealing ring is an annular pyramid sealing ring; a section of the pole assembly 4 cooperating with the sealing ring 5 is a cylindrical section, and the conical sealing ring 5 is an annular conical sealing ring. It should be noted that in the existing combined battery cover plates, generally circular sealing rings are used. Due to their structural characteristics, during long-term use of circular sealing rings, especially during frequent battery charging and discharging processes, due to the singularity of their shapes, fatigue damage is likely to occur in specific areas, thereby leading to sealing failure.

[0057] The combined battery cover plate 100 provided by the present application uses a conical sealing ring 5. Due to the change in its cross-section, when the conical sealing ring 5 is squeezed, the stress distribution is more uniform, which can better disperse external forces and reduce the possibility of damage.

[0058] Reference Figure 6 , in one embodiment, an included angle is formed between the inner circumference and the outer circumference of the sealing ring 5, and the angle a of the included angle is 15° to 45°.

[0059] Specifically, the angle a can be 15°, 20°, 25°, 30° or 45°. In the present application, when the angle formed between the inner circumference and the outer circumference of the sealing ring 5 takes the above limited angles, it can ensure uniform pressure between the sealing ring 5 and the contact surface, thereby providing more effective sealing; in the specific preparation process, the angle of the included angle between the inner circumference and the outer circumference of the sealing ring 5 can be set according to the actual situation.

[0060] Reference Figure 6 , in one embodiment, the height H of the sealing ring 5 is 1.0 mm to 3.5 mm.

[0061] Specifically, at the axial two ends of the sealing ring 5, the first insulating member 1 and the second insulating member 3 are respectively sealed and connected. When the height H of the sealing ring 5 is set within the above range, when the sealing ring 5 within this height range is compressed, it can provide sufficient elasticity to form effective sealing, without damaging the sealing ring 5 or affecting its service life due to excessive compression, or affecting the sealing effect of the sealing ring 5 due to insufficient compression, and maintaining good sealing performance. Specifically, the height H of the sealing ring 5 can be 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm or 3.5 mm. The height H of the sealing ring 5 can be specifically selected according to different battery models. For example, when the thickness of the cover plate 2 is larger, the sealing ring 5 also requires a larger height H.

[0062] Reference Figure 6 , in one embodiment, the thickness H1 of the end of the smaller end of the sealing ring 5, that is, the end with a smaller outer peripheral dimension on the sealing ring 5, in the direction perpendicular to the axis of the pole column assembly 4 is 0.5 mm to 3 mm.

[0063] Specifically, when the thickness H1 of the end of the smaller end of the sealing ring 5 in the direction perpendicular to the axis of the pole column assembly 4 is 0.5 mm to 3 mm, it ensures the material thickness and axial stress-bearing area of the smaller end of the sealing ring 5, as well as the stress dispersion when the sealing ring 5 is squeezed, and optimizes the sealing performance; specifically, the thickness H1 of the end of the smaller end of the sealing ring 5 in the direction perpendicular to the axis of the pole column assembly 4 can be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm or 3.0 mm. H1 can be specifically selected according to different battery models.

[0064] In one embodiment, the terminal assembly 4 includes a terminal 41 and a pressure plate 42. The terminal 41 includes a first cylinder 411, a second cylinder 412, and a third cylinder 413 that are connected in sequence. The second cylinder 412 is connected between the first cylinder 411 and the third cylinder 413. One side of the first cylinder 411 away from the second cylinder 412 protrudes from the surface of the first insulating member 1. The pressure plate 42 is sleeved on the outer periphery of the third cylinder 413;

[0065] A second insulating member 3 is insulatingly connected between the pressure plate 42 and the cover plate 2;

[0066] The pressure plate 42 is fixedly connected to the third cylinder 413, and the pressure plate 42 and the first cylinder 411 cooperate to clamp the first insulating member 1, the cover plate 2, and the second insulating member 3.

[0067] Specifically, referring to Figure 3 , compared with the assembly of a conventional terminal, when the terminal assembly 4 is sequentially passed through the first insulating member 1, the cover plate 2, the second insulating member 3, and the sealing ring 5, the pressure plate 42 is sleeved on the outer periphery of the third cylinder 413 of the terminal 41 and is fixedly connected to the third cylinder 413. The pressure plate 42 not only plays a fixing role but also can cooperate with the first cylinder 411 to clamp the first insulating member 1, the cover plate 2, and the second insulating member 3, thereby ensuring the structural stability and electrical isolation of the entire assembly;

[0068] In this way, by inverting the terminal assembly 4, the electrode plate used for external connection is not welded at the outer end of the terminal assembly 4, simplifying the outer structure of the combined battery cover plate. When the battery cells are grouped, the tabs of the PACK are welded to the terminals of adjacent battery cells. The first cylinder 411 is welded to the tabs. The first cylinder 411 provides a larger area for welding with the tabs than the electrode plate, with a larger error tolerance. On the basis of meeting the over-current requirement of the battery cells, the size of the terminal 41 can be reduced, and the pressure plate 42 can also be set smaller, as long as the pressure plate 42 and the terminal 41 can cooperate to reliably clamp the first insulating member 1, the cover plate 2, the second insulating member 3, and the sealing ring 5. The terminal assembly 4 uses less material, which is beneficial for weight reduction and cost reduction, and improves the energy density of the battery;

[0069] Specifically, the pressure plate 42 is welded to the third cylinder 413 to ensure the reliability of the connection;

[0070] At the axial two ends of the sealing ring 5, they are respectively in contact with the first insulating member 1 and the second insulating member 3. The second insulating member 3 is connected between the pressure plate 42 and the cover plate 2, so that the second insulating member 3 is spaced between the sealing ring 5 and the pressure plate 42, eliminating the risk of damaging the sealing ring 5 and affecting the sealing performance when the pressure plate 42 is fixedly connected (such as welded) to the third cylinder 413, ensuring that the assembled combined battery cover plate has a safer, more reliable sealing performance and a longer sealing life at the installation position of the terminal assembly 4.

[0071] Specifically, the terminal post 41 is of an integral structure, which simplifies the structure, helps to optimize the current conduction path, and improves the battery performance.

[0072] Referring to Figure 1 and Figures 7 - 8 , in one embodiment, the cover plate 2 is provided with a first mounting hole 21 and a first limiting groove 22, and the first limiting groove 22 penetrates through one side of the cover plate 2 facing the second insulating member 3; one end of the first mounting hole 21 penetrates through one side of the cover plate 2 facing the first insulating member 1, and the other end of the first mounting hole 21 penetrates to the first limiting groove 22;

[0073] The second insulating member 3 is provided with a boss 32, and the first limiting groove 22 and the boss 32 are mutually engaged;

[0074] On the side of the boss 32 facing away from the cover plate 2, a second limiting groove 33 is provided, and the pressing plate 42 is fitted into the second limiting groove 33;

[0075] The boss 32 is provided with a second mounting hole 31;

[0076] The second column body 412 passes through the first mounting hole 21 and the second mounting hole 31; the outer periphery of the sealing ring 5 fits against the inner wall of the first mounting hole 21.

[0077] The mutual engagement of the first limiting groove 22 and the boss 32, and the fitting of the pressing plate 42 into the second limiting groove 33 facilitate the assembly of the combined battery cover plate, and ensure that the terminal post assembly 4 does not twist when subjected to torsion, improving the structural strength, reliability and sealing performance of the combined battery cover plate. There is no need to set additional positioning structures, reducing the material used for the combined battery cover plate and achieving weight reduction and cost reduction.

[0078] Specifically, during the assembly process, the terminal post assembly 4 passes through the first insulating member 1, the cover plate 2, the second insulating member 3 and the sealing ring 5, and then the pressing plate 42 is fixed;

[0079] Specifically, on the one hand, the mutual engagement of the first limiting groove 22 and the boss 32 is conducive to forming a tight connection relationship between the cover plate 2 and the second insulating member 3, and at the same time preventing the terminal post 41 passing through the first mounting hole 21 from twisting. On the other hand, the fitting of the pressing plate 42 into the second limiting groove 33 is conducive to forming a connecting member with reliable connection strength between the terminal post 41 and the second insulating member 3. That is, through the cooperation of the first receiving groove and the boss 32 and the cooperation of the second receiving groove and the pressing plate 42, it is conducive to improving the connection strength and sealing performance of the overall structure of the combined battery cover plate 100. While optimizing the connection strength and sealing performance, there is no need to additionally add other fixing-related devices, making the overall weight of the combined battery cover plate 100 light and the manufacturing cost low.

[0080] Specifically, the outer periphery of the sealing ring 5 fits against the inner wall of the first mounting hole 21, which can effectively prevent leakage of liquid or gas and further ensure good sealing performance of the battery.

[0081] In one embodiment, the boss 32 and the pressing plate 42 have a square outer peripheral contour, and the first limiting groove 22 and the second limiting groove 33 have a square inner peripheral contour.

[0082] Specifically, the square outer peripheral contours of the boss 32 and the pressing plate 42 can respectively match the square inner peripheral contours of the first limiting groove 22 and the second limiting groove 33, reducing relative movement and rotation generated between the pole column assembly 4 and other structural members in the combined battery cover plate 100, further improving the structural stability, and avoiding safety problems such as short circuits caused by movement between components in the combined battery cover plate 100 during battery use.

[0083] Refer to Figure 4 In one embodiment, the outer peripheral dimension of the first column body 411 is larger than that of the second column body 412, and the outer peripheral dimension of the second column body 412 is larger than that of the third column body 413;

[0084] The cover plate 2 is provided with a first mounting hole 21, and the second column body 412 is inserted through the first mounting hole 21; the outer periphery of the sealing ring 5 fits against the inner wall of the first mounting hole 21, and the inner periphery fits against the second column body 412;

[0085] The inner wall of the first mounting hole 21 is located inside the extension plane of the outer peripheral surface of the first column body 411;

[0086] Along the thickness direction of the cover plate 2, the pressing plate 42 faces the cover plate 2, the part of the first column body 411 protruding from the outer periphery of the second column body 412, and the part of the second column body 412 protruding from the outer periphery of the third column body 413. There are relative parts of the outer circle of the first column body 411, the cover plate 2, and the pressing plate 42 in the thickness direction of the cover plate 2. The overall structure of the combined battery cover plate is compact, with better strength, more reliable sealing, less material used, lighter weight, and lower cost.

[0087] Refer to Figure 4 In one embodiment, the minimum distance between the inner wall of the first mounting hole 21 and the extension plane of the outer peripheral surface of the first column body 411 is W1, and W1 is 0.5 - 3 mm;

[0088] The distance between the outer wall of the pressing plate 42 and the extension plane of the outer peripheral surface of the first column body 411 is W2, and W2 is 0 - 2 mm, taking into account the compactness, strength, and sealing performance of the overall structure of the combined battery cover plate, and achieving weight reduction and cost reduction.

[0089] In one embodiment, it further includes a liquid injection port 6 and an explosion-proof valve 7, and the liquid injection port 6 and the explosion-proof valve 7 are arranged on the cover plate 2.

[0090] Specifically, the liquid injection port 6 is mainly used to inject electrolyte into the battery housing after the battery cover is sealed. The explosion-proof valve 7 is arranged to automatically open when the internal pressure of the battery is too high, release the pressure, and prevent the battery from exploding due to excessive pressure. In addition, integrating the liquid injection port 6 and the explosion-proof valve 7 on the cover plate 2 simplifies the overall design of the battery and reduces the need for additional components and equipment.

[0091] In another embodiment, the present application provides a battery including a combined battery cover plate 100.

[0092] Specifically, in the battery provided by the present application, the combined battery cover plate 100 improves the overall assembly strength of the combined battery cover plate 100 by adjusting the assembly position of the sealing ring 5 in the combined battery cover plate 100 and the shape of the sealing ring 5, thereby facilitating the improvement of the overall electrical performance of the battery.

[0093] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combined battery cover plate, characterized in that, It includes a first insulating part (1), a cover plate (2), a second insulating part (3), a pole column assembly (4) and a sealing ring (5); The pole column assembly (4) passes through the first insulating part (1), the cover plate (2), the second insulating part (3) and the sealing ring (5); The first insulating part (1) is insulatingly connected between one end of the pole column assembly (4) for external connection and one side of the cover plate (2); the second insulating part (3) is insulatingly connected between the other end of the pole column assembly (4) and the other side of the cover plate (2); Axial two ends of the sealing ring (5) respectively abut against the first insulating part (1) and the second insulating part (3); the inner circumference of the sealing ring (5) abuts against the outer circumference of the pole column assembly (4), and the outer circumference of the sealing ring (5) abuts against the cover plate (2); The outer circumference dimension of the sealing ring (5) gradually increases from one end of the sealing ring (5) to the other end.

2. The combined battery cover plate according to claim 1, wherein, The outer circumference dimension of the end of the sealing ring (5) close to the first insulating part (1) is smaller than the outer circumference dimension of the end of the sealing ring (5) close to the second insulating part (3); or, The outer circumference dimension of the end of the sealing ring (5) close to the first insulating part (1) is larger than the outer circumference dimension of the end of the sealing ring (5) close to the second insulating part (3).

3. The combined battery cover plate according to claim 1, characterized in that, The sealing ring (5) is a conical sealing ring (5).

4. A combined battery cover plate according to claim 1, characterized in that, The height H of the sealing ring (5) is 1.0 mm to 3.5 mm.

5. The combined battery cover plate according to claim 1, characterized in that, The thickness H1 of the end of the smaller end of the sealing ring (5) in the direction perpendicular to the axis of the pole column assembly (4) is 0.5 mm to 3 mm.

6. The combined battery cover plate according to claim 1, wherein, An included angle is formed between the inner circumference and the outer circumference of the sealing ring (5), and the angle a of the included angle is 15° to 45°.

7. A combined battery cover plate according to claim 1, characterized in that, The pole column assembly (4) includes a pole column (41) and a pressing plate (42), the pole column (41) includes a first column body (411), a second column body (412) and a third column body (413) connected in sequence, the second column body (412) is connected between the first column body (411) and the third column body (413), one side of the first column body (411) away from the second column body (412) protrudes from the surface of the first insulating part (1), and the pressing plate (42) is sleeved on the outer circumference of the third column body (413); The second insulating part (3) is insulatingly connected between the pressing plate (42) and the cover plate; The pressing plate (42) is fixedly connected to the third column body (413), and the pressing plate (42) and the first column body (411) cooperate to clamp the first insulating part (1), the cover plate (2) and the second insulating part (3).

8. The combined battery cover plate according to claim 7, characterized in that, The cover plate (2) is provided with a first mounting hole (21) and a first limiting groove (22), the first limiting groove (22) penetrates through one side of the cover plate (2) facing the second insulating part (3); one end of the first mounting hole (21) penetrates through one side of the cover plate (2) facing the first insulating part (1), and the other end of the first mounting hole (21) penetrates through to the first limiting groove (22); A boss (32) is provided on the second insulating member (3), and the first limiting groove (22) is fitted with the boss (32); A second limiting groove (33) is provided on the side of the boss (32) facing away from the cover plate (2), and the pressing plate (42) is fitted in the second limiting groove (33); A second mounting hole (31) is provided on the boss (32); The second column (412) passes through the first mounting hole (21) and the second mounting hole (31); the outer periphery of the sealing ring (5) is in contact with the inner wall of the first mounting hole (21).

9. The combined battery cover plate according to claim 8, wherein, The boss (32) and the pressing plate (42) have a square outer peripheral contour, and the first limiting groove (22) and the second limiting groove (33) have a square inner peripheral contour.

10. A combined battery cover plate according to claim 7, characterized in that, The outer peripheral dimension of the first column (411) is larger than the outer peripheral dimension of the second column (412), and the outer peripheral dimension of the second column (412) is larger than the outer peripheral dimension of the third column (413); A first mounting hole (21) is provided on the cover plate (2), and the second column (412) passes through the first mounting hole (21); the outer periphery of the sealing ring (5) is in contact with the inner wall of the first mounting hole (21), and the inner periphery is in contact with the second column (412); The inner wall of the first mounting hole (21) is located inside the extension plane of the outer peripheral surface of the first column (411); Along the thickness direction of the cover plate (2), the pressing plate (42) faces the cover plate (2), the part of the first column (411) protruding from the outer periphery of the second column (412), and the part of the second column (412) protruding from the outer periphery of the third column (413).

11. A combined battery cover plate according to claim 10, characterized in that, The minimum distance between the inner wall of the first mounting hole (21) and the extension plane of the outer peripheral surface of the first column (411) is W1, and W1 is 0.5 to 3 mm; The distance between the outer wall of the pressing plate (42) and the extension plane of the outer peripheral surface of the first column (411) is W2, and W2 is 0 to 2 mm.

12. A battery, characterized in that, Comprising the combined battery cover plate according to any one of claims 1 to 11.

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