Battery

Abstract

The utility model discloses a battery and relates to the technical field of batteries. The battery comprises a square shell battery structure which comprises a shell, a cover plate and an explosion-proof assembly, wherein one end of the shell is provided with an opening part, the other end of the shell is provided with a closed part, and the closed part is provided with two pole holes; the cover plate is matched with the opening part, and the cover plate is fixed on the opening part; at least one explosion-proof assembly is arranged, and the explosion-proof assembly is fixedly connected to the cover plate; the at least one roll core is mounted on the shell, and a tab for electrical connection is arranged on the roll core; the connecting sheet is fixedly connected to the tab; the pole body is welded and fixed on the connecting sheet and is arranged in the pole hole in a penetrating manner; the lug boss on the connecting sheet is welded and fixed with the pole body; and the lower part of the pole body is provided with a concave part which is matched and connected with the convex part. The explosion-proof structure of the battery can effectively solve the problem that the product yield is low due to the fact that an explosion-proof structure of an existing battery is complex in manufacturing process in the using process, and the utilization rate of the internal space of the battery and the using safety are improved.

Description

Technical Field

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

[0002] Lithium-ion batteries are currently the best battery systems in terms of comprehensive performance, with characteristics such as high specific energy, long cycle life, small size, light weight, no memory effect, and no pollution. They have rapidly developed into a new generation of energy storage power sources and are widely used in information technology, electric vehicles and hybrid vehicles, aerospace and other fields. Among them, square batteries, as one of the three packaging (square, soft pack, cylindrical) forms of power batteries, have a series of advantages such as high packaging reliability, high system energy efficiency, relatively simple structure, large single-cell capacity, relatively simple system composition, and low cost.

[0003] With the rapid development of the electric vehicle industry, as a power source, the demand for the safety, energy density, charging speed, etc. of lithium-ion batteries continues to increase significantly. In the existing conventional technical solutions, the pole body, liquid injection hole, and explosion-proof valve are integrated onto the top cover sheet. The advantage is the traditional and mature process route, and the process is simple with a high yield. However, there is a problem that the battery terminal and the explosion-proof valve are in one direction. Once the battery undergoes thermal runaway, a large amount of high-temperature gas sprays out from the explosion-proof valve and directly acts on the external electrical circuit, posing a risk of secondary safety problems.

[0004] At present, the commonly used technical means is to set up a separate exhaust channel for the explosion-proof valve position through pack (battery pack) design and isolate it from the electrical circuit. However, this design will greatly increase the design difficulty of the pack section and will occupy more space, which is not conducive to the improvement of the energy density of the battery system. Another solution is to set the explosion-proof valve on the side wall or bottom of the housing to achieve thermoelectric separation of the battery system. However, opening holes on the housing and welding the explosion-proof valve sheet inside has a large process difficulty due to limited operable space, resulting in a low product yield. Based on the above, this application proposes a new type of battery to solve the above problems. Summary of the Utility Model

[0005] In view of the above disadvantages of the prior art, the purpose of the present utility model is to disclose a battery to improve the problem that the yield of the existing battery explosion-proof device is relatively low due to complex processes during the setting process.

[0006] To achieve the above purpose and other related purposes,

[0007] The present utility model discloses a battery, comprising:

[0008] Square shell battery structure, comprising: a shell, one end of which is provided with an opening part, the other end is provided with a closed part, and two pole column holes are arranged on the closed part; a cover plate, which is adapted to the opening part and fixed on the opening part; and at least one explosion-proof component, which is fixedly connected to the cover plate;

[0009] In one solution of the present utility model, an explosion-proof hole is opened on the cover plate, and the explosion-proof component is fixedly connected at the position of the explosion-proof hole. At least one winding core is installed in the shell, and pole tabs for electrical connection are arranged on the winding core;

[0010] A connecting piece is fixedly connected to the pole tab;

[0011] A pole column body is welded and fixed to the connecting piece and passes through the pole column hole;

[0012] A convex part is arranged on the connecting piece, and the pole column body is welded to the convex part; a concave part is arranged at the lower part of the pole column body, and the concave part is connected with the convex part in a matching manner.

[0013] In one solution of the present utility model, a protection component is arranged between the pole column body and the closed part of the shell, and the protection component includes:

[0014] A sealing ring, which is sleeved on the pole column body and located in the pole column hole;

[0015] An insulating gasket, which is located above the sealing ring and sleeved on the pole column body; and

[0016] A metal gasket, which is located above the insulating gasket and sleeved on the pole column body.

[0017] In one solution of the present utility model, a bottom gasket is further included, which is attached to the inner side of the closed part.

[0018] In one solution of the present utility model, a peripheral part of the pole column body includes an extension part, and a partial structure of the bottom gasket is located between the closed part and the extension part.

[0019] In one solution of the present utility model, an explosion-proof hole is opened on the cover plate, and the explosion-proof component is fixedly connected at the position of the explosion-proof hole.

[0020] In one solution of the present utility model, the explosion-proof component is an explosion-proof sheet or an explosion-proof valve.

[0021] In one solution of the present utility model, a liquid injection hole is opened on the closed part.

[0022] In summary, the present utility model discloses a battery. By arranging the pole column body on the closed part of the housing and the explosion-proof component on the cover plate. The explosion-proof component and the pole column body are respectively located at both ends of the winding core, and their separation design can achieve electro-thermal separation, improving the safety of battery use. At the same time, by arranging the explosion-proof component on the cover plate, the manufacturing process of the battery during preparation can be effectively simplified, so as to improve the yield of the product. It can effectively improve the problem that the explosion-proof device of the existing battery is complex in the setting process, resulting in a low yield of the product, and improves the utilization rate of the internal space of the battery and the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic structural diagram of a square shell battery structure of the present utility model in an embodiment;

[0025] Figure 2 Partial structural schematic diagram of a square shell battery structure of the present utility model in an embodiment;

[0026] Figure 3 Schematic structural diagram of a battery of the present utility model in an embodiment;

[0027] Figure 4 Schematic structural diagram of a battery of the present utility model in an isometric view in an embodiment;

[0028] Figure 5 Schematic explosion structure diagram of a battery of the present utility model in an embodiment.

[0029] Description of Component Labels

[0030] 100, housing; 110, opening part; 120, closed part; 121, pole column hole; 122, liquid injection hole; 130, cover plate; 131, explosion-proof hole; 140, explosion-proof component;

[0031] 200, winding core; 210, pole ear; 220, connecting piece; 221, convex part; 230, pole column body; 231, concave part; 2330, extension part; 240, protection component; 241, sealing ring; 242, insulating gasket; 243, metal gasket; 244, bottom gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following describes the implementation manners of the present utility model through specific examples. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0033] Please refer to Figures 1 to 5 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have technical essential meanings. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0034] Please refer to Figures 1 to 5 , the present utility model discloses a square shell battery structure to improve the problem that the yield of products is relatively low due to the complex manufacturing process during the setting of the explosion-proof device of the existing battery. Among them, the square shell battery structure includes a shell 100, a cover plate 130, and at least one explosion-proof component 140.

[0035] Specifically, the shell 100 adopts a rectangular structure to improve the subsequent battery structure density. One end of the shell 100 is provided with an opening 110, and the other end is provided with a closed part 120. From the opening 110 to the position of the closed part 120 is the cavity for the winding core 200 of the battery. Therefore, the winding core 200 of the battery is placed in this cavity. Further, two pole holes 121 are provided on the closed part 120, and pole bodies 230 are provided in the pole holes 121. Therefore, the pole bodies 230 can be connected to the winding core 200.

[0036] It should be noted that a liquid injection hole 122 is also opened on the closed part 120. The main function of the liquid injection hole 122 is to inject electrolyte into the battery. The electrolyte is a key component in the battery, which determines the performance and cycle life of the battery. Through the liquid injection hole 122, the electrolyte can be accurately added into the battery to ensure that the battery can work normally.

[0037] Further, the cover plate 130 is adapted to the opening 110, and the cover plate 130 is fixed on the opening 110. Preferably, the cover plate 130 is buckled at the opening 110 and the sealing between the two is realized by laser welding. At the same time, the explosion-proof component 140 is fixedly connected to the cover plate 130.

[0038] Please refer to Figures 1 to 5, in one embodiment, explosion - proof holes 131 may be provided on the cover plate, and the explosion - proof component 140 is fixedly connected at the position of the explosion - proof holes 131. Specifically, the explosion - proof component 140 may be an explosion - proof valve or an explosion - proof sheet, which can be determined according to actual requirements. When the pressure inside the housing 100 exceeds the set value, the explosion - proof valve or the explosion - proof sheet will automatically open to release some fluid to ensure the safety of the system.

[0039] Please refer to Figures 1 to 5 , in one embodiment, the present utility model also provides a battery, which includes the square - shell battery structure as outlined in the above - mentioned embodiment.

[0040] Specifically, the battery disclosed by the present utility model may further include a winding core 200, a connecting piece 220, and a terminal body 230. At least one winding core 200 is provided, and the winding core 200 is located in the cavity inside the housing 100. Tab ears 210 for electrical connection are provided on the winding core 200, and the connecting piece 220 is fixedly connected to the tab ears 210. Therefore, the power transmission of the winding core 200 can be achieved through the connecting piece 220, and at the same time, the terminal body 230 is fixedly connected to the connecting piece 220. A part of the structure of the terminal body 230 is located outside the housing 100 to facilitate the power transmission of the winding core 200.

[0041] Furthermore, a convex portion 221 is provided on the connecting piece 220, and the terminal body 230 is welded to the convex portion 221. A concave portion 231 is provided at the lower part of the terminal body 230 to ensure cooperation with the convex portion 221 provided on the connecting piece 220 for positioning purposes, ensuring that the terminal body 230 can be accurately welded to the connecting piece 220. At the same time, for the housing 100, the terminal body 230 is located in the terminal hole 121 of the housing 100.

[0042] Please refer to Figures 1 to 5 , in one embodiment, in order to improve the safety performance of the device during actual use. A protection component 240 may be provided between the terminal body 230 and the closed portion 120 of the housing 100. Among them, the protection component 240 includes a sealing ring 241, an insulating gasket 242, and a metal gasket 243.

[0043] Furthermore, the sealing ring 241 is sleeved on the terminal body 230 and is disposed in the terminal hole 121. And the insulating gasket 242 is located above the sealing ring 241 and is sleeved on the terminal body 230. Therefore, by providing the sealing ring 241 between the closed portion 120 of the housing 100 and the terminal body 230, the sealing performance at the connection position between the terminal body 230 and the housing 100 can be effectively improved. And by providing the insulating gasket 242 between the closed portion 120 of the housing 100 and the terminal body 230, the insulation effect at the connection position between the terminal body 230 and the housing 100 can be effectively improved.

[0044] It is understandable that the metal gasket 243 is located above the insulating gasket 242 and sleeved on the terminal body 230. The metal gasket can be selected as a hard metal with a higher hardness to improve the structural strength after the riveting of the terminal body 230.

[0045] Please refer to Figures 1 to 5 , in an embodiment, the periphery of the terminal body 230 includes an extension portion 2330, and a bottom gasket 244 is disposed between the extension portion 2330 and the closed portion 120 of the housing 100. Through the bottom gasket 244, the insulation effect between the winding core 200 and the housing 100 is improved. Specifically, the bottom gasket 244 is attached to the inner side of the closed portion 120, and a part of the structure of the bottom gasket 244 is located between the closed portion 120 and the extension portion 2330.

[0046] It should be noted that, in an embodiment, during the assembly process of the battery, first, the terminal body 230 and the liquid injection hole 122 are disposed at the bottom of the housing 100, and the explosion-proof valve is disposed on the bottom cover plate 130. Then, the connection piece 220 with the convex portion 221 is connected to the tab 210 of the winding core 200 by laser welding or ultrasonic welding. Secondly, the winding core 200 with the connection piece 220 is placed into the housing 100, and the terminal body 230 and the convex portion 221 of the connection piece 220 are welded together by laser penetration welding to achieve electrical connection. Finally, the cover plate 130 is buckled on the opening portion 110 of the housing 100 and sealed by laser welding.

[0047] In summary, the present utility model discloses a square shell battery structure and a battery, which set the terminal body 230 on the closed portion 120 of the housing 100, and the explosion-proof component 140 on the cover plate 130. The explosion-proof component 140 and the terminal body 230 are respectively located at both ends of the winding core 200, and their separation design can completely achieve electro-thermal separation, improve the safety of battery use; and reduce the number of single-side openings, improve the mechanical strength of the structural parts. At the same time, by setting the explosion-proof component 140 on the cover plate 130, the manufacturing process of the battery during preparation can be effectively simplified to improve the yield of the product. By connecting the connection piece 220 and the terminal body 230 in a penetration welding manner, compared with the traditional structure, the space is saved and the space utilization rate is improved.

[0048] Therefore, the present utility model can effectively improve the problem that the yield of the existing battery explosion-proof device is relatively low due to the complex manufacturing process during the setting process. Therefore, the present utility model effectively overcomes some practical problems in the prior art and thus has high utilization value and practical significance.

[0049] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A battery, characterized in that: include: A square shell battery structure comprises: a shell (100), one end of which is provided with an opening portion (110), and the other end of which is provided with a closing portion (120), and the closing portion (120) is provided with two pole holes (121); a cover sheet (130), which is adapted to the opening portion (110), and the cover sheet (130) is fixed on the opening portion (110); and at least one explosion-proof component (140), and the explosion-proof component (140) is fixedly connected to the cover sheet (130); At least one winding core (200) is installed on the housing (100), and a pole lug (210) for electrical connection is provided on the winding core (200); A connecting piece (220) fixedly connected to the pole ear (210); A pole body (230) is welded and fixed to the connecting piece (220) and is inserted into the pole hole (121); A protrusion (221) is provided on the connecting sheet (220), and the pole body (230) and the protrusion (221) are fixed by welding; a recess (231) is provided at the lower part of the pole body (230), and the recess (231) is connected in a matching manner with the protrusion (221).

2. The battery according to claim 1, characterized in that A protection component (240) is provided between the pole body (230) and the closing portion (120) of the housing (100), and the protection component (240) comprises: A sealing ring (241) sleeved on the pole body (230) and located in the pole hole (121); an insulating gasket (242), which is located above the sealing ring (241) and sleeved on the pole body (230); and A metal gasket (243) is located above the insulating gasket (242) and is sleeved on the pole body (230).

3. The battery according to claim 2, characterized in that It also includes a bottom gasket (244) which is attached to the inner side of the closing portion (120).

4. The battery according to claim 3, characterized in that The periphery of the pole body (230) includes an extension portion (2330), and a partial structure of the bottom gasket (244) is located between the closing portion (120) and the extension portion (2330).

5. The battery according to claim 1, characterized in that An explosion-proof hole (131) is provided on the cover plate (130), and the explosion-proof component (140) is fixedly connected at the position of the explosion-proof hole (131).

6. The battery according to claim 1, characterized in that The explosion-proof component (140) is an explosion-proof disk or an explosion-proof valve.

7. The battery according to claim 1, characterized in that The sealing portion (120) is provided with a liquid injection hole (122).

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