Batteries and battery packs

Abstract

To provide a battery in which the inside of an extension part is filled with one winding core and the number of extension parts coincides with the number of winding cores.SOLUTION: A battery pack includes a plurality of batteries and the battery includes at least two winding cores 1 and a case 2 in which the winding cores are provided and two extension parts communicating to each other are provided around a central axis thereof. The inside of each extension part is filled with one winding core, and the number of extension parts coincides with the number of winding cores. The inside of one case is filled with a plurality of winding cores, and a single case is capable of protecting a plurality of winding cores. Therefore, it is not necessary for each winding core to response to one case and materials required for manufacturing the case are decreased. Further, a weight of a single battery is reduced, a battery energy density is effectively improved, and the number of structural members is decreased. A plurality of extension parts is provided such that a surface heat dissipation area of the battery is increased and it is advantageous for heat management control of the battery pack.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to batteries and battery packs.

Background Art

[0002] In a normal power battery pack currently commercially available, generally, a plurality of battery cells are power-connected through external power connection components to form a battery module, and then assembled from the module into a battery pack.

[0003] The frames and structural members that make up a module with a single unit often have a certain mechanical strength and can play roles such as supporting, fixing, and protecting the single battery cell. However, there are many attachment structures that make up the module and the battery pack, which not only lead to cost increases, but also increase the weight of the entire battery pack. In addition, a lot of space is occupied by the attachment structure, resulting in a low capacity and low energy density for the single battery cell of the power battery pack.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to overcome at least one of the drawbacks described in the above prior art, the present invention provides a battery and a battery pack that can improve the number and capacity of single battery cells and effectively improve the battery energy density.

Means for Solving the Problems

[0005] The technical solution adopted by the present invention to solve this problem is as follows.

[0006] According to a first aspect, the present invention is a battery, comprising: at least two wound cores, and a case provided inside the wound core and provided with at least two communicating extending portions around its central axis. Each of the extended portions is filled with one of the winding cores, and the number of extended portions and the number of winding cores are to be equal, providing a battery.

[0007] By arranging it in this way, multiple winding cores can be filled into a single case, and a single case can protect multiple winding cores, effectively improving battery energy density and reducing the number of structural components.

[0008] According to one preferred embodiment, the extensions are provided in 2 to 6 units.

[0009] According to one preferred embodiment, the case includes a body having the extension and a top cover that covers the end face of the core.

[0010] According to one preferred embodiment, the case further includes two current-collecting disks, the plane on which the end faces are located is parallel to the plane on which the end faces of the top lid are located, Each of the two current-collecting disks is defined as the first current-collecting disk and the second current-collecting disk, and the first current-collecting disk and the second current-collecting disk are located at both ends of the winding core and are welded to two tabs of the winding core.

[0011] According to one preferred embodiment, the top cover is provided with pole columns, and the current collector disk adjacent to the top cover is welded to the pole columns.

[0012] According to one preferred embodiment, the current collector disk adjacent to the top cover is provided with a boss, the boss is positioned toward the pole column and is welded to the pole column.

[0013] According to one preferred embodiment, the current collector disk, which is separated from the top cover, is provided with a vertical edge, which is welded to the side wall of the main body.

[0014] According to one preferred embodiment, the length of the vertical side is defined as H, where 0.5 mm ≤ H ≤ 2 mm.

[0015] According to one preferred embodiment, the thickness of the boss is defined as T, where 0.1 mm ≤ T ≤ 0.6 mm.

[0016] According to one preferred embodiment, each of the winding cores located within the same case is connected in parallel.

[0017] According to one preferred embodiment, the body further includes a cover plate, the ends of which are open, the cover plate is provided on the side of the body away from the top lid and covers one of the openings, the first current collector disk is provided close to the top lid, the second current collector disk is provided close to the cover plate, reinforcing ribs are provided on the side of the cover plate facing the second current collector disk, and at least a portion of the reinforcing ribs abuts against the second current collector disk.

[0018] According to one preferred embodiment, a gap exists between the portion of the cover plate that does not have reinforcing ribs and the second current collector disk, and the distance of the gap is defined as D, where 0.2 mm ≤ D ≤ 0.7 mm.

[0019] According to one preferred embodiment, an explosion-proof cutout is provided on the side of the cover plate away from the second current collector disk.

[0020] According to one preferred embodiment, the thickness of the portion of the cover plate in which the explosion-proof cutout is provided is 0.05 to 0.12 mm.

[0021] According to a second aspect, the present invention further provides a battery pack comprising the battery described above.

[0022] According to one preferred embodiment, the batteries are arranged in multiple rows, and two adjacent rows of batteries are spaced apart. [Effects of the Invention]

[0023] As described above, the battery and battery pack according to the present invention have at least the following technical effects: 1) A plurality of winding cores are filled in one case. A single case can protect the plurality of winding cores, effectively improve the battery energy density, reduce the number of structural members, 2) The plurality of batteries are directly assembled into a battery pack, eliminating the need to assemble them into a battery pack after forming a module, saving battery arrangement space, and significantly improving the energy of the battery pack. 3) The case is provided with 2 to 6 extending portions, increasing the surface heat dissipation area of the battery, which is beneficial for the thermal management control of the battery pack.

Brief Description of the Drawings

[0024] [Figure 1] It is an exploded perspective view of the battery in the embodiment of the present invention. [Figure 2] It is an exploded perspective view of the case in the embodiment of the present invention. [Figure 3] It is a plan view of the case in the embodiment of the present invention. [Figure 4] It is a cross-sectional view of the battery in the embodiment of the present invention. [Figure 5] It is a three-dimensional structure diagram of the cover plate in the embodiment of the present invention. [Figure 6] There is a schematic diagram of the welding trace between the first current collector disk and the winding core in the embodiment of the present invention. [Figure 7] It is a schematic diagram of the welding between the case and the first current collector disk in the embodiment of the present invention. [Figure 8] It is a schematic diagram of the welding between the case and the second current collector disk in the embodiment of the present invention. [Figure 9] It is a plan view of the battery arrangement in the embodiment of the present invention. [Figure 10] It is a plan view of the battery pack arrangement in the embodiment of the present invention. [Figure 11] It is a three-dimensional structure diagram of FIG. 9.

Modes for Carrying Out the Invention

[0025] To facilitate better understanding and implementation, the technical proposal of the embodiment of the present invention will be clearly and completely described below, accompanied by drawings of the embodiment.

[0026] However, in the description of the present invention, directions or positional relationships indicated by terms such as "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are based on the directions or positional relationships shown in the drawings and are merely for the convenience and simplification of the description of the present invention. They do not indicate or imply that the shown devices or elements have a specific direction or must be configured and operated in a specific direction, and therefore cannot be understood as limitations on the present invention.

[0027] In this description of the present invention, unless otherwise explicitly stated and limited, the terms “first” and “second” are for illustrative purposes only and should not be understood as indicating or implying relative importance. The term “plural” refers to two or more, and the term “and / or” includes any combination and all combinations of one or more related items. In particular, the “the said / the said” object or “one” object referred to is similarly intended to indicate one of several possible such objects.

[0028] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of this invention are for the purpose of describing specific embodiments and are not intended to limit this application. The terms “including” and “having,” and any variations thereof, in the description of the specification, claims, and drawings above, are intended to cover non-exclusive inclusion.

[0029] Furthermore, in the description of the present invention, directional terms such as "up," "down," "inside," and "outside" are used to describe angles shown in the drawings and should not be understood as limiting specific embodiments. Also, when it is mentioned in the context that one element or feature is connected to the "up," "down," "inside," or "outside" of another element(s), it should be understood that this connection may be not only direct, but also indirect, via an intermediate element.

[0030] Referring to Figure 1, the present invention discloses a battery comprising a core 1 and a case 2, wherein the core 1 is a cylindrical core 1 and is housed within the case 2, and the case 2 has at least two extensions around its central axis, with one core 1 filled within each extension, so that the number of extensions corresponds to the number of cores 1. Multiple cores 1 are filled within one case 2, and a single case 2 can protect multiple cores 1, so each core 1 does not need to correspond to one case 2, reducing the material required to manufacture the case 2, further reducing the weight of a single battery, effectively improving the battery energy density, and reducing the number of structural members. Because multiple extensions are provided, the surface heat dissipation area of ​​the battery is increased, which is advantageous for thermal management control of the battery pack.

[0031] Preferably, the number of extended parts is 2 to 6, and in this embodiment, the battery structure will be specifically described in the case of 3 extended parts.

[0032] Furthermore, the battery of this embodiment further includes two current-collecting disks provided within the case 2, each of which is defined as a first current-collecting disk 3 and a second current-collecting disk 5. As can be seen from the above, the core 1 is a cylindrical core, and the first current-collecting disk 3 and the second current-collecting disk 5 are welded to tabs drawn out from the two circular end faces of the core 1, respectively. Referring together to Figures 2 and 3, the case 2 includes a main body 21, a top cover 22, an inner seal ring 23, an outer seal ring 24, and a pole post 25. The main body 21 and the top cover 22 are integrally molded, both ends of the main body 21 are open, the main body 21 has three extended portions, the top cover 22 covers the end face of the winding core 1, one of the first current collector disk 3 and the second current collector disk 5 is provided in a semi-enclosed area formed by the main body 21 and the top cover 22, the other is provided at the end away from the top cover 22, and the pole post 25 is provided on the top cover 22. Specifically, the current collector disc adjacent to the top cover 22 is defined as the first current collector disc 3, and the current collector disc welded to the other end of the winding core 1 is defined as the second current collector disc 5. The first current collector disc 3 and the second current collector disc 5 are welded to two tabs of the winding core 1, and the first current collector disc 3 is provided with a boss (not shown), which is provided facing the pole column 25. The thickness of the boss is defined as T, where 0.1 mm ≤ T ≤ 0.6 mm, to facilitate welding between the pole column 25 and the first current collector disc 3. An insulating gasket 4 is provided between the top cover 22 and the first current collector disc 3, and a cover plate 6 is provided at the bottom of the second current collector disc 5. The cover plate 6 is welded to the case 2.

[0033] As shown in Figures 3 to 6, the case 2 in this embodiment is provided with three extending portions and has an outward-extending petal shape. The shape of the first current collector disk 3 and / or the second current collector disk 5 matches the shape of the top cover 22. Figure 6 is a schematic diagram of the welding marks between the first current collector disk 3 and the winding core 1 in this embodiment. In the figure, A is the welding trajectory, ensuring that the first current collector disk 3 is welded to each of the three winding cores 1. After welding the first current collector disk 3 to the winding core 1, the first current collector disk 3 and a portion of the winding core 1 are wrapped with spacer tape to prevent a short circuit in the battery caused by the tab coming into contact with the case 2 after being turned outwards. Then, an insulating gasket 4 is placed inside the case 2, between the top cover 22 and the first current collector disc 3. The first current collector disc 3 and the winding core 1, which are wrapped in spacer tape, are placed inside the case 2. The pole post 25 and the boss of the first current collector disc 3 are welded together by a laser beam in the welding direction shown in Figure 7, and after the pole post 25 is electrically connected to the circuit of the first current collector disc 3, the pole post sealing nail 7 is welded to the pole post 25 to complete the sealing on the terminal side. Specifically, an inner sealing ring 23 and an outer sealing ring 24 are provided on both sides of the pole post 25 to further enhance the sealing performance of the end of the pole post 25. The second current collector disc 5 is provided with a vertical side, and the vertical side and the side wall of the main body 21 are welded together by a laser beam in the welding direction shown in Figure 8. The length of the vertical side is defined as H, where 0.5 mm ≤ H ≤ 2 mm. By welding the second current collector disc 5 to the case 2, the case 2 is charged, and the electrical connection of the circuit is completed. The reason for not welding the second current collector disk 5 and the cover plate 6 is to reduce conductive wiring and lower the internal resistance of the battery. In this embodiment, the battery further includes the cover plate 6, and both ends of the main body 21 are open. The cover plate 6 is provided on the side of the main body 21 away from the top cover 22 and covers one of the openings. The cover plate 6, which has a liquid injection hole, is welded to the periphery of the case 2. Finally, liquid is injected into the inside of the case 2 through the liquid injection hole, filling it with helium, inserting sealing rubber particles, welding the cover plate sealing nails 8, and completing the complete sealing of the battery.

[0034] Specifically, as shown in Figure 5, the second current collector disk 5 is provided close to the cover plate 6, and reinforcing ribs 61 are provided on the side of the cover plate 6 facing the second current collector disk 5. At least a portion of the reinforcing ribs 61 abuts against the second current collector disk 5, further compressing the winding core 1 and preventing it from shaking. There is no interference between the portion of the cover plate 6 where the reinforcing ribs 61 are not provided and the second current collector disk 5, and a gap exists. As shown in Figure 2, the distance of this gap is defined as D, where 0.2 mm ≤ D ≤ 0.7 mm. The cover plate 6 does not conduct electricity with the winding core 1, reducing conductive wiring and lowering the internal resistance of the battery.

[0035] In one preferred embodiment, the cover plate 6 is further provided with explosion-proof cutouts 63, the explosion-proof cutouts 63 located at the bottom of the case 2, and in this embodiment, the thickness of the portion of the cover plate 6 where the explosion-proof cutouts 63 are provided is 0.05 mm to 0.12 mm, thereby ensuring the safety of the battery during use.

[0036] As can be seen from the above, the side where the pole 25 is located is defined as the output area, and the side where the cover plate 6 is located is defined as the functional area. By setting it up in this way, it is advantageous for standardizing the design and assembly, and convenient for mass production.

[0037] Furthermore, the present invention further provides a battery pack comprising the plurality of batteries described above, wherein the plurality of batteries are directly assembled into the battery pack, eliminating the need to assemble them into the battery pack after forming modules, saving battery array space and significantly improving the energy of the battery pack. The batteries are arranged in multiple rows, with two adjacent rows of batteries located at the ends spaced apart, as shown in Figure 9, where there are three batteries of the same shape and size, each battery having three extensions, and each of the three batteries is defined as the first integrator 100, the second integrator 200, and the third integrator 300, where the first integrator 100 and the second integrator 200 are located in the same row, and the third integrator 300 is located between the first integrator 100 and the second The first assembly 100 is fitted between the first and second assembly 200, and the second assembly 200 is provided with a first extension 110, and the second assembly 200 is provided with a second extension 210, with a gap between the first extension 110 and the second extension 210. The third assembly 300 is provided with a third extension 310, and the third extension 310 is provided in the gap between the first extension 110 and the second extension 210, with both sides in contact with the first and second assembly 100 and the second assembly 200, respectively.

[0038] Specifically, referring to Figures 10 and 11 together, when multiple rows of batteries are provided and each row has multiple assemblies, the arrangement configuration in Figure 9 is similarly applied to Figures 10 and 11, and the repeated parts will not be explained further. In Figures 10 and 11, the battery pack further includes a fourth assembly 400, which is provided at the end of the row, and each of the two extended portions of the fourth assembly 400 abuts against the extended portions of two symmetrically provided third assemblies 300, thereby increasing the space utilization rate at the end.

[0039] As described above, the battery and battery pack according to the present invention have at least the following technical effects.

[0040] Multiple winding cores 1 are packed into one case 2, and a single case 2 can protect multiple winding cores 1, effectively improving battery energy density and reducing the number of structural components. Multiple batteries are assembled directly into the battery pack, eliminating the need to assemble them into the battery pack after forming the module, saving battery array space and significantly improving the battery pack's energy output. Case 2 is provided with 2 to 6 extended sections, which increases the surface heat dissipation area of ​​the battery and is advantageous for thermal management control of the battery pack.

[0041] The technical means disclosed in aspects of the present invention are not limited to those disclosed in the above embodiments, but include any combination of the above technical features. Those skilled in the art should note that several improvements and finishes can be made without departing from the principles of the present invention, and these improvements and finishes can also be considered within the scope of protection of the present invention. [Explanation of Symbols]

[0042] 1-Core, 2-Case, 21-Main body, 22-Top cover, 23-Inner sealing ring, 24-Outer sealing ring, 25-Position post, 3-First current collector disc, 4-Insulating gasket, 5-Second current collector disc, 6-Cover plate, 61-Reinforcement rib, 62-Injection hole, 63-Explosion-proof cutout, 7-Position post sealing nail, 8-Cover plate sealing nail, 100-First assembly, 110-First extension, 200-Second assembly, 210-Second extension, 300-Third assembly, 310-Third extension, 400-Fourth assembly.

Claims

1. It is a battery, At least two cores (1), The case (2) has the aforementioned winding core (1) provided inside, and at least two mutually communicating extended portions are provided around its central axis, The case (2) includes two current-collecting disks whose end faces are located on a plane parallel to the plane on which the end faces of the top cover (22) are located, Each of the extended portions is filled with one of the winding cores (1), and the number of extended portions and the number of winding cores (1) are equal. The case (2) includes a main body (21) having the extended portion and a top cover (22) that covers the end face of the winding core (1). A battery characterized in that each of the two current-collecting disks is defined as a first current-collecting disk (3) and a second current-collecting disk (5), and the first current-collecting disk (3) and the second current-collecting disk (5) are located at both ends of the winding core (1) and are welded to the tabs of the winding core (1).

2. The battery according to claim 1, characterized in that two to six of the aforementioned extensions are provided.

3. The battery according to claim 1, characterized in that the upper cover (22) is provided with pole posts (25), and the current collector disk adjacent to the upper cover (22) is welded to the pole posts (25).

4. The battery according to claim 3, wherein the current collector disk adjacent to the upper cover (22) is provided with a boss, the boss is provided facing the pole column (25) and is welded to the pole column (25).

5. The battery according to claim 1, wherein the current collector disk, which is separated from the upper cover (22), has a vertical edge, and the vertical edge is welded to the side wall of the main body (21).

6. The battery according to claim 5, characterized in that the length of the vertical side is defined as H, and 0.5 mm ≤ H ≤ 2 mm.

7. The battery according to claim 4, characterized in that the thickness of the boss is defined as T, and 0.1 mm ≤ T ≤ 0.6 mm.

8. The battery according to any one of claims 1 to 7, characterized in that each of the winding cores (1) located within the same case (2) is connected in parallel.

9. The battery according to any one of claims 1 to 7, further comprising a cover plate (6), wherein both ends of the main body (21) are open, the cover plate (6) is provided on the side of the main body (21) away from the top cover (22) and covers one of the openings, the first current collector disc (3) is provided close to the top cover (22), the second current collector disc (5) is provided close to the cover plate (6), a reinforcing rib (61) is provided on the side of the cover plate (6) facing the second current collector disc (5), and at least a portion of the reinforcing rib (61) abuts against the second current collector disc (5).

10. The battery according to claim 9, characterized in that a gap exists between the portion of the cover plate (6) where reinforcing ribs are not provided and the second current collector disk (5), and the distance of the gap is defined as D, such that 0.2 mm ≤ D ≤ 0.7 mm.

11. The battery according to claim 9, characterized in that an explosion-proof cutout (63) is provided on the side of the cover plate (6) that is away from the second current collector disk (5).

12. The battery according to claim 11, characterized in that the thickness of the portion of the cover plate (6) in which the explosion-proof cutout (63) is provided is 0.05 to 0.12 mm.

13. A battery pack comprising a battery according to any one of claims 1 to 7, The battery pack is characterized in that the batteries are arranged in multiple rows, and two adjacent rows of batteries are spaced apart.

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