Top cover assembly, battery and electric equipment

Abstract

The utility model relates to a top cover assembly, a battery and electric equipment. The top cover assembly comprises a cover plate, the pole assembly comprises a first pole, a second pole, a first connecting piece and a second connecting piece, the first pole and the second pole are arranged on the cover plate in an insulating mode, the polarity of the first pole is opposite to that of the second pole, the first connecting piece is connected with the first pole, and the second connecting piece is connected with the second pole; and the connecting assembly comprises at least one connecting ring, and the connecting ring is arranged on the first pole or / and the second pole. According to the utility model, heat can be effectively prevented from being conducted and penetrating through the connecting part of the connecting sheet and the pole in the welding process, so that high-temperature damage to a sealing element in the cover plate is effectively avoided. In addition, by arranging the connecting ring, the effect of optimizing electrical connection can be achieved, the contact area between the pole and the connecting piece is increased, and therefore the contact internal resistance can be reduced, and the conductivity can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover component, a battery and an electrical device. Background Art

[0002] Lithium-ion batteries have the advantages of being pollution-free, having high battery capacity, and having a long cycle life. As an important type of battery in the field of new energy, they are widely used. During the manufacturing process of lithium-ion batteries, the positive electrode sheet, the separator, and the negative electrode sheet are wound or stacked to form a battery cell, which is then placed in a shell, and then the cover assembly is assembled, and then the electrolyte is injected and sealed. In the traditional lithium-ion battery design, the poles on the battery cover and the connecting pieces are usually connected by riveting.

[0003] However, although this connection method is simple, it has several significant problems: First, directly riveting the pole and the connecting piece may result in many gaps on the contact surface and poor contact, thereby increasing the contact internal resistance and affecting the overall conductivity of the battery. Secondly, if the contact internal resistance is reduced by rework methods such as laser welding the contact surface between the pole and the connecting piece, the high temperature generated during the welding process may damage the seals inside the battery cover, which are essential to prevent electrolyte leakage. Once the seal is damaged, leakage will occur, the safety and stability of the battery will be affected, there will be safety hazards, and the stability will be reduced. Utility Model Content

[0004] To this end, the technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a top cover assembly, a battery and an electrical device. The utility model can improve electronic conductivity, reduce contact internal resistance, and improve the sealing performance inside the battery, effectively prevent electrolyte leakage, improve the safety and stability of the battery, and reduce safety hazards.

[0005] In order to solve the above technical problems, the utility model provides a top cover assembly, comprising:

[0006] Cover plate;

[0007] A pole assembly, comprising a first pole, a second pole, a first connecting piece and a second connecting piece, wherein the first pole and the second pole are insulated and arranged on the cover plate, and the polarity of the first pole is opposite to that of the second pole, the first connecting piece is connected to the first pole, and the second connecting piece is connected to the second pole;

[0008] The connection assembly comprises at least one connection ring, wherein the connection ring is arranged on the first pole and / or the second pole, and the connection ring abuts against a side of the first connection piece and / or the second connection piece away from the cover plate.

[0009] In an embodiment of the present invention, the connecting ring is flush with one end surface of the first pole and / or the second pole.

[0010] In an embodiment of the present invention, the connection assembly includes a first connection ring and a second connection ring, the first connection ring is sleeved on the first pole, and the second connection ring is sleeved on the second pole.

[0011] In one embodiment of the utility model, one side surface of the first connecting ring is flush with the end face of the first pole, and the other side surface of the first connecting ring is connected to the first connecting piece; one side surface of the second connecting ring is flush with the end face of the second pole, and the other side surface of the second connecting ring is connected to the second connecting piece.

[0012] In one embodiment of the utility model, it also includes a first sealing component and a second sealing component, the first sealing component is arranged on the first pole, the second sealing component is arranged on the second pole, the first sealing component includes a first seal and a second seal, the first seal and the second seal are respectively located on both sides of the cover plate; the second sealing component includes a third seal and a fourth seal, the third seal and the fourth seal are respectively located on both sides of the cover plate.

[0013] In one embodiment of the present invention, a first conductive pad is further included. The first conductive pad is sleeved on the first pole, and the first conductive pad is located between the first connecting piece and the cover plate.

[0014] In an embodiment of the present invention, the connecting ring is made of metal.

[0015] In one embodiment of the utility model, an explosion-proof valve is further included. The cover plate is provided with a mounting hole, and the explosion-proof valve is assembled in the mounting hole.

[0016] The utility model also provides a battery, comprising a shell, a battery cell assembly and a top cover assembly as described above, wherein one end of the shell along the length direction has an opening, the top cover assembly is arranged at the opening, and the battery cell assembly is accommodated in the shell.

[0017] The utility model also provides an electrical device, comprising the battery as described above.

[0018] The above technical solution of the utility model has the following advantages compared with the prior art:

[0019] A top cover assembly described in the utility model is provided with a cover plate, a pole assembly and a connecting assembly. A connecting ring is arranged around at least one pole, and the connecting ring can limit the connecting piece. The connecting ring is connected to a side surface of the connecting piece away from the cover plate. The pole, the connecting ring and the connecting piece are connected by laser welding technology.

[0020] The utility model has a simple structure and is conducive to popularization and application. Due to the presence of the connecting ring, heat conduction and penetration of the connection between the connecting piece and the pole during welding can be effectively avoided, thereby effectively avoiding high-temperature damage to the sealing part inside the cover plate.

[0021] In addition, by providing a connecting ring, the electrical connection can be optimized, and the contact area between the pole and the connecting piece can be increased, thereby reducing the contact internal resistance and effectively improving the conductivity.

[0022] During the welding process, the laser is prevented from damaging the components in the inner cavity of the shell when the laser passes through the cover plate and welds with the shell, thereby effectively improving the qualified rate of the product. It can also improve the safety and stability of the battery and reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0024] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the utility model.

[0025] Figure 2 It is an exploded view of the overall structure of a preferred embodiment of the utility model.

[0026] Figure 3 It is a schematic diagram of the overall structural cross-section of a preferred embodiment of the utility model.

[0027] Explanation of the reference numerals in the specification: 1. Cover plate; 21. First pole; 22. Second pole; 23. First connecting plate; 24. Second connecting plate; 25. First conductive gasket; 3. Connecting ring; 31. First connecting ring; 32. Second connecting ring; 41. First sealing member; 42. Second sealing member; 43. Third sealing member; 44. Fourth sealing member; 5. Explosion-proof valve; 6. Shell. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0029] Embodiment 1

[0030] Reference Figures 1 to 3 As shown, the utility model discloses a top cover assembly, including a cover plate 1;

[0031] The top cover assembly further includes a pole assembly, the pole assembly including a first pole 21, a second pole 22, a first connecting piece 23 and a second connecting piece 24, the first pole 21 and the second pole 22 are insulated and arranged on the cover plate 1, and the polarity of the first pole 21 is opposite to that of the second pole 22, the first connecting piece 23 is connected to the first pole 21, and the second connecting piece 24 is connected to the second pole 22;

[0032] The top cover assembly also includes a connecting assembly, which includes at least one connecting ring 3, which is arranged on the first pole 21 and / or the second pole 22, and abuts against the first connecting piece 23 and / or the second connecting piece 24 away from the cover plate 1.

[0033] Specifically, when one connecting ring 3 is provided, the connecting ring 3 is provided on the first pole 21 or the second pole 22 , and the connecting ring 3 abuts against a side of the first connecting piece 23 or the second connecting piece 24 away from the cover plate 1 .

[0034] It should be noted that the connecting ring 3 is connected to the pole assembly, the first connecting piece 23 and the second connecting piece 24 by laser welding.

[0035] It can be known from this that the top cover assembly to be protected by the utility model is provided with a cover plate, a pole assembly and a connecting assembly, a connecting ring is arranged around at least one pole, and the connecting ring can limit the connecting piece, the connecting ring is connected to the surface of the side of the connecting piece away from the cover plate, and the pole, the connecting ring and the connecting piece are connected by laser welding technology. The structure of the utility model is simple and is conducive to popularization and application. Due to the existence of the connecting ring, it can effectively avoid heat conduction and penetration of the connection between the connecting piece and the pole during welding, thereby effectively avoiding high temperature damage to the seal inside the cover plate. In addition, by setting the connecting ring, it can optimize the electrical connection, increase the contact area between the pole and the connecting piece, thereby reducing the contact internal resistance and effectively improving the conductivity. During the welding process, it avoids the damage of the laser to the inner cavity component of the shell when the laser passes through the cover plate and welds with the shell, thereby effectively improving the qualified rate of the product. And it can improve the safety and stability of the battery and reduce safety hazards.

[0036] As a preferred implementation, the upper surface of the connecting ring 3 is flush with one end surface of the first pole 21 and / or the second pole 22 .

[0037] In detail, the connection assembly includes a first connection ring 31 and a second connection ring 32 . The first connection ring 31 is sleeved on the first pole 21 , and the second connection ring 32 is sleeved on the second pole 22 .

[0038] Specifically, one side surface of the first connecting ring 31 is flush with the end surface of the first pole 21, and the other side surface of the first connecting ring 31 is in contact with the first connecting piece 23;

[0039] One side surface of the second connecting ring 32 is flush with the end surface of the second pole 22 , and the other side surface of the second connecting ring 32 is connected to the second connecting piece 24 .

[0040] As a preferred embodiment, the first connecting ring 31 is tightly sleeved on the first pole 21, and the second connecting ring 32 is tightly sleeved on the second pole 22. In this way, the poor contact between the first connecting piece 23 and the first pole 21, and the poor contact between the second connecting piece 24 and the second pole 22 can be effectively improved, thereby effectively reducing the contact resistance.

[0041] As a preferred embodiment, the top cover assembly further includes a first conductive pad 25, which is sleeved on the first pole 21 and located between the first connecting piece and the cover plate. The first conductive pad 25 can prevent electrochemical corrosion.

[0042] Furthermore, the top cover assembly further includes a first sealing assembly and a second sealing assembly, wherein the first sealing assembly is disposed on the first pole 21 , and the second sealing assembly is disposed on the second pole 22 .

[0043] Specifically, the first sealing assembly includes a first sealing member 41 and a second sealing member 42, and the first sealing member 41 and the second sealing member 42 are respectively located on both sides of the cover plate 1. The first sealing member 41 is sleeved on the outside of the first pole 21. In detail, the first sealing member 41 is sleeved on the periphery of the first conductive pad 25.

[0044] As a preferred embodiment, the first sealing member 41 is a concave gasket, and the second sealing member 42 is a convex gasket. The first sealing member 41 and the second sealing member 42 cooperate with each other, thereby achieving a better sealing effect and effectively preventing leakage of the electrolyte.

[0045] It should be noted that the first sealing member 41 can also play a role in supporting the first connecting piece 23 and the first pole 21 .

[0046] Correspondingly, the second sealing assembly includes a third sealing member 43 and a fourth sealing member 44, and the third sealing member 43 and the fourth sealing member 44 are respectively located on both sides of the cover plate 1. The third sealing member 43 is sleeved on the outer side of the second pole 22.

[0047] As a preferred implementation, the third sealing member 43 is a concave gasket, and the fourth sealing member 44 is a convex gasket. The third sealing member 43 and the fourth sealing member 44 cooperate with each other and can also play a sealing role, thereby effectively preventing electrolyte leakage.

[0048] In addition, the third sealing member 43 can also support the second connecting piece 24 and the second pole 22 .

[0049] It should be noted that the connection ring 3 is made of metal. As a preferred embodiment, the connection ring 3 is made of a material with high electrical conductivity, including but not limited to aluminum or copper.

[0050] The top cover assembly further includes an explosion-proof valve 5 . A mounting hole is provided on the cover plate 1 , and the explosion-proof valve 5 is assembled in the mounting hole.

[0051] Embodiment 2

[0052] The utility model also discloses a battery, comprising a shell 6, a battery cell assembly and a top cover assembly as described in the first embodiment, wherein the shell 6 has an opening at one end along the length direction, the top cover assembly is arranged at the opening, and the battery cell assembly is accommodated in the shell 6.

[0053] Embodiment 3

[0054] The utility model also discloses an electric device, comprising a battery as described in the second embodiment. The battery is used to provide electric energy to the electric device.

[0055] The following examples illustrate the qualified rate data of batteries using the top cover structure of the utility model in the actual production process:

[0056]

[0057] Table 1

[0058] Referring to Table 1, when welding the cover plate and the shell of the square battery, the poor contact rate between the connecting piece and the pole after riveting of 10,000 traditional ones without connecting rings, as well as the poor contact rate between the welding connecting piece and the pole after using the cover plate with a metal ring, were counted. After improvement, the poor contact rate between the connecting piece and the pole dropped from 3% to 0%, with a 100% qualified rate. In addition, after laser repair of the cover plate without the connecting ring, 21% of the leakage will occur, causing the battery cell to be scrapped. Even if the cover plate with the connecting ring has a poor contact rate between the connecting piece and the pole, the laser repair will avoid damage to the components inside the shell due to the shielding and heat dissipation of the connecting ring, and there will be no leakage.

[0059] Electrical equipment may be automobiles, portable devices, laptops, ships, spacecraft, electric toys, electric tools, and the like. Automobiles may be fuel-powered automobiles, gas-powered automobiles, or new energy automobiles. New energy automobiles may be pure electric vehicles, hybrid electric vehicles, or extended-range vehicles, and the like; spacecraft include airplanes, rockets, space shuttles, and spacecraft, and the like; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present invention do not impose any special restrictions on the above-mentioned electrical equipment.

[0060] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0061] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A top cover assembly, characterized in that: include, Cover plate; A pole assembly, comprising a first pole, a second pole, a first connecting piece and a second connecting piece, wherein the first pole and the second pole are insulated and arranged on the cover plate, and the polarity of the first pole is opposite to that of the second pole, the first connecting piece is connected to the first pole, and the second connecting piece is connected to the second pole; The connection assembly comprises at least one connection ring, wherein the connection ring is arranged on the first pole and / or the second pole, and the connection ring abuts against a side of the first connection piece and / or the second connection piece away from the cover plate.

2. A top cover assembly according to claim 1, characterized in that: The connecting ring is flush with one end surface of the first pole and / or the second pole.

3. A top cover assembly according to claim 2, characterized in that: The connection assembly includes a first connection ring and a second connection ring, wherein the first connection ring is sleeved on the first pole, and the second connection ring is sleeved on the second pole.

4. A top cover assembly according to claim 3, characterized in that: One side surface of the first connecting ring is flush with the end surface of the first pole, and the other side surface of the first connecting ring is connected to the first connecting piece; one side surface of the second connecting ring is flush with the end surface of the second pole, and the other side surface of the second connecting ring is connected to the second connecting piece.

5. A top cover assembly according to claim 1, characterized in that: It also includes a first sealing component and a second sealing component, the first sealing component is arranged on the first pole, and the second sealing component is arranged on the second pole, the first sealing component includes a first seal and a second seal, and the first seal and the second seal are respectively located on both sides of the cover plate; the second sealing component includes a third seal and a fourth seal, and the third seal and the fourth seal are respectively located on both sides of the cover plate.

6. A top cover assembly according to claim 1, characterized in that: It also includes a first conductive pad, which is sleeved on the first pole and located between the first connecting piece and the cover plate.

7. A top cover assembly according to claim 1, characterized in that: The connecting ring is made of metal.

8. A top cover assembly according to claim 1, characterized in that: It also includes an explosion-proof valve. The cover plate is provided with a mounting hole, and the explosion-proof valve is assembled in the mounting hole.

9. A battery, characterized in that : comprising a shell, a battery cell assembly and a top cover assembly as described in any one of claims 1 to 8, wherein the shell has an opening at one end along the length direction, the top cover assembly is arranged at the opening, and the battery cell assembly is accommodated in the shell.

10. An electrical equipment, characterized in that: Comprising a battery as claimed in claim 9.

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