Battery and battery pack

Abstract

Provided in the present application are a battery and a battery pack. The battery pack comprises at least one battery, the battery comprising at least two jelly rolls and a casing, wherein the jelly rolls are arranged in the casing; the casing is provided with at least two mutually communicating extension parts around the central axis thereof; each extension part is filled with one jelly roll; and the number of extension parts is consistent with the number of jelly rolls. The present application reduces the weight of individual batteries, effectively improves the energy density of the batteries, and also increases the surface heat dissipation area of the batteries, thus facilitating heat management control over the battery pack.

Description

Batteries and battery packs

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 31, 2023, with application number 2023223711318. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery and a battery pack. Background Art

[0003] The common power battery packs on the market generally connect multiple battery cells through external power connectors to form battery modules, which are then assembled into battery packs.

[0004] The frames and structural parts of the modules often have a certain mechanical strength, which can support, fix and protect the battery cells. Technical issues

[0005] The large number of mounting structures that make up the module and battery pack will not only increase the cost but also increase the overall weight of the battery pack. In addition, the large space occupied by the mounting structure will also make the power battery pack have a lower capacity for the battery cell and a lower energy density. Technical Solutions

[0006] In a first aspect, the present application provides a battery, comprising:

[0007] At least two roll cores;

[0008] A shell, the winding core is arranged in the shell, and the shell is provided with at least two mutually connected extension parts around its central axis;

[0009] Each extension is filled with a winding core, and the number of extensions is the same as the number of winding cores.

[0010] In a second aspect, the present application also provides a battery pack, comprising the battery provided in the present application. Beneficial effects

[0011] The battery and battery pack provided in this application have the following beneficial effects:

[0012] 1) Multiple winding cores are filled in a shell, and a single shell can protect multiple winding cores, effectively improving the battery energy density and reducing the number of structural parts;

[0013] 2) At least one battery is directly assembled into a battery pack, without the need to form a module and then assemble it into a battery pack, saving battery layout space and greatly improving the battery pack energy;

[0014] 3) The shell is equipped with 2 to 6 extensions, which increases the surface heat dissipation area of ​​the battery and facilitates thermal management control of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is an exploded perspective view of the battery provided in this application;

[0016] FIG2 is an exploded perspective view of the housing provided by this application;

[0017] FIG3 is a top view of the housing provided in the present application;

[0018] FIG4 is a cross-sectional view of a battery provided by the present application;

[0019] FIG5 is a three-dimensional structural diagram of the cover provided in this application;

[0020] FIG6 is a schematic diagram of the welding mark of the first current collecting disk and the winding core provided by the present application;

[0021] FIG7 is a schematic diagram of welding the housing and the first current collecting plate provided by the present application;

[0022] FIG8 is a schematic diagram of welding the housing and the second current collecting plate provided by the present application;

[0023] FIG9 is a top view of the arrangement of the batteries provided in this application;

[0024] FIG10 is a top view of the arrangement of the battery pack provided in this application;

[0025] FIG11 is a three-dimensional structural diagram of FIG9 .

[0026] The meanings of the reference numerals are as follows:

[0027] 1-winding core; 2-shell; 21-main body; 22-upper cover; 23-inner sealing ring; 24-outer sealing ring; 25-pole; 3-first collecting plate; 4-insulating gasket; 5-second collecting plate; 6-cover plate; 61-reinforcement rib; 62-liquid injection hole; 63-explosion-proof notch; 7-pole sealing nail; 8-cover plate sealing nail; 100-first integrated body; 110-first extension part; 200-second integrated body; 210-second extension part; 300-third integrated body; 310-third extension part; 400-fourth integrated body. Modes for Carrying Out the Invention

[0028] Referring to Figure 1, an embodiment of the present application provides a battery, including a core 1 and a shell 2, wherein the core 1 is a cylindrical core 1 and is arranged in the shell 2, and the shell 2 is provided with at least two extension parts around its central axis, and each extension part is filled with a core 1, and the number of extension parts is consistent with the number of cores 1; since multiple cores 1 are filled in one shell 2, a single shell 2 can protect multiple cores 1, and there is no need for each core 1 to correspond to a shell 2, which reduces the material required to make the shell 2, thereby reducing the weight of a single battery, and effectively improving the battery energy density and reducing the number of structural parts; since there are multiple extension parts, the surface heat dissipation area of ​​the battery is increased, which is beneficial to the thermal management control of the battery pack.

[0029] In some embodiments, the number of extension portions is selected to be 2 to 6. In this embodiment, the battery structure is specifically described with reference to a case of 3 extension portions.

[0030] The battery of this embodiment also includes two current collecting discs, which are arranged in the shell 2. The two current collecting discs are respectively a first current collecting disc 3 and a second current collecting disc 5. As can be seen from the above, the winding core 1 is a cylindrical winding core, and the first current collecting disc 3 and the second current collecting disc 5 are respectively welded to the pole ears led out from the two circular end surfaces of the winding core 1; please refer to Figures 2 and 3 again, the shell 2 includes a body 21, an upper cover 22, an inner sealing ring 23, an outer sealing ring 24 and a pole 25, the body 21 and the upper cover 22 are integrally formed, the body 21 has openings at both ends, the body 21 has three extensions, the upper cover 22 is covered on the end surface of the winding core 1, and one of the first current collecting disc 3 and the second current collecting disc 5 is provided between the body 21 and the upper cover 22. The semi-enclosed area is formed, and the other is provided at one end away from the upper cover 22, and the pole 25 is provided on the upper cover 22; specifically, the collecting disk close to the upper cover 22 is the first collecting disk 3, and the collecting disk welded to the other end of the winding core 1 is the second collecting disk 5. The first collecting disk 3 and the second collecting disk 5 are respectively welded to the two pole ears of the winding core 1, and a convex hull (not shown in the figure) is provided on the first collecting disk 3, which is arranged toward the pole 25. The thickness of the convex hull is T, 0.1mm≤T≤0.6mm, which facilitates the welding of the pole 25 and the first collecting disk 3; an insulating gasket 4 is provided between the upper cover 22 and the first collecting disk 3, and a cover plate 6 is provided at the bottom of the second collecting disk 5, which is welded to the shell 2.

[0031] As shown in Figures 3 to 6, the shell 2 in this embodiment is provided with three extensions, and is in the shape of an outward-extending petal. The shape of the first collecting disc 3 and / or the second collecting disc 5 is consistent with the shape of the upper cover 22. Figure 6 is a schematic diagram of the welding mark of the first collecting disc 3 and the winding core 1 in this embodiment. Figure A is the welding mark trajectory, which ensures that the first collecting disc 3 is welded to the three winding cores 1 respectively; after the first collecting disc 3 is welded to the winding core 1, the first collecting disc 3 and the winding core 1 are wrapped with spacer tape to prevent the pole ear from touching the shell 2 after turning outward and causing a short circuit in the battery; then the insulating gasket 4 is placed in the shell 2, and is arranged between the upper cover 22 and the first collecting disc 3. Then the first collecting disc 3 and the winding core 1 wrapped with spacer tape are placed in the shell 2, and then the pole 25 is connected to the convex hull of the first collecting disc 3 by laser beam welding. The welding direction is shown in Figure 7, so that the pole 25 conducts the circuit of the first collecting disc 3, and then the pole sealing nail 7 is welded to The pole 25 completes the terminal side seal. Specifically, an inner sealing ring 23 and an outer sealing ring 24 are provided on both sides of the pole 25 to enhance the sealing of the pole 25 end; the second current collecting disc 5 is provided with a vertical edge, which is connected to the side wall of the body 21 by laser beam welding. The welding direction is shown in Figure 8. The length of the vertical edge is H, 0.5mm≤H≤2mm. By welding the second current collecting disc 5 and the shell 2, the shell 2 is energized and the conduction circuit is completed; the second current collecting disc 5 is not welded to the cover plate 6 because the conduction circuit is reduced and the internal resistance of the battery is reduced; the battery in this embodiment also includes a cover plate 6, the two ends of the body 21 are open, the cover plate 6 is provided on the side of the body 21 away from the upper cover 22 and covers one of the openings, the cover plate 6 is welded to the periphery of the shell 2, and a liquid injection hole is provided on the cover plate 6; finally, liquid is injected into the interior of the shell 2 through the liquid injection hole, helium is filled, sealing rubber particles are inserted, and the cover plate sealing nails 8 are welded to complete the full sealing of the battery.

[0032] Specifically, as shown in Figure 5, the second current collecting disk 5 is arranged close to the cover plate 6, and a reinforcing rib 61 is provided on the side of the cover plate 6 facing the second current collecting disk 5. The reinforcing rib 61 at least partially abuts the second current collecting disk 5, thereby compressing the core 1 to prevent the core 1 from shaking; there is no interference between the portion of the cover plate 6 where the reinforcing rib 61 is not provided and the second current collecting disk 5, and there is a gap. As shown in Figure 2, the distance of the gap is D, 0.2mm≤D≤0.7mm, and the cover plate 6 is not energized with the core 1 to reduce the conduction circuit and reduce the internal resistance of the battery.

[0033] In one embodiment, the cover plate 6 is further provided with an explosion-proof notch 63, which is located at the bottom of the shell 2. In this embodiment, the thickness of the portion of the cover plate 6 provided with the explosion-proof notch 63 is 0.05 mm to 0.12 mm to ensure the safety of battery use.

[0034] In this embodiment, the side where the pole 25 is located is the output area, and the side where the cover plate 6 is located is the functional area. This arrangement is conducive to design and assembly standardization and facilitates mass production.

[0035] The present application also provides a battery pack, including at least one battery provided in the present application, wherein at least one battery is directly assembled into a battery pack without forming a module and then assembling the battery pack, thereby saving battery arrangement space and greatly improving the energy of the battery pack; the battery is provided in multiple columns, and the two adjacent columns of batteries at the end are arranged at intervals, as shown in FIG9 , FIG9 has three batteries of the same shape and size, and each battery has three extensions, the three batteries are respectively a first assembly 100, a second assembly 200 and a third assembly 300, the first assembly 100 and The second integrated body 200 is located in the same row, and the third integrated body 300 is embedded between the first integrated body 100 and the second integrated body 200. The first integrated body 100 is provided with a first extension portion 110, and the second integrated body 200 is provided with a second extension portion 210. There is a gap between the first extension portion 110 and the second extension portion 210. The third integrated body 300 is provided with a third extension portion 310. The third extension portion 310 is provided in the gap between the first extension portion 110 and the second extension portion 210, and the two sides are respectively abutted against the first integrated body 100 and the second integrated body 200.

[0036] Specifically, please refer to Figures 10 and 11. When the battery is provided with multiple columns and each column has multiple assemblies, the arrangement in Figure 9 is also applicable to Figures 10 and 11, and the repeated parts are not further described. In Figures 10 and 11, the battery pack also includes a fourth assembly 400, which is provided at the end of the column. The two extensions of the fourth assembly 400 are respectively abutted against the extensions of the two symmetrically arranged third assemblies 300, thereby increasing the space utilization rate of the end.

[0037] In summary, the battery and battery pack provided by the embodiments of the present application have at least the following technical effects:

[0038] Multiple winding cores 1 are filled in a shell 2. A single shell 2 can protect multiple winding cores 1, effectively improving the battery energy density and reducing the number of structural parts.

[0039] At least one battery is directly assembled into a battery pack without forming a module and then assembling it into a battery pack, which saves battery layout space and greatly improves the battery pack energy;

[0040] The shell 2 is provided with 2 to 6 extension parts, which increases the surface heat dissipation area of ​​the battery and is beneficial to the thermal management control of the battery pack.

Claims

1. A battery comprising: at least two winding cores (1); A shell (2), the winding core (1) being arranged inside the shell (2), and the shell (2) being provided with at least two mutually connected extension parts around its central axis; Each of the extension parts is filled with a winding core (1), and the number of the extension parts is consistent with the number of the winding cores (1).

2. The battery according to claim 1, wherein The number of the extension parts is 2 to 6.

3. The battery according to claim 1 or 2, wherein: The shell (2) comprises a main body (21) and an upper cover (22); the main body (21) has the extended portion; and the upper cover (22) is arranged on the end surface of the winding core (1).

4. The battery according to claim 3 further comprises two current collecting plates, the two current collecting plates are arranged in the shell (2), and the plane where the end faces of the current collecting plates are located is parallel to the plane where the end faces of the upper cover (22) are located; the two current collecting plates are respectively a first current collecting plate (3) and a second current collecting plate (5), the first current collecting plate (3) and the second current collecting plate (5) are respectively located at the two ends of the winding core (1) and are welded to the pole ears of the winding core (1).

5. The battery according to claim 4, wherein The upper cover (22) is provided with a pole (25), and the current collecting plate close to the upper cover (22) is welded to the pole (25).

6. The battery according to claim 5, wherein The current collecting plate close to the upper cover (22) is provided with a bulge, the bulge is arranged toward the pole (25), and the bulge is welded to the pole (25).

7. The battery according to claim 4, wherein The current collecting plate away from the upper cover (22) is provided with a vertical edge, and the vertical edge is welded to the side wall of the body (21).

8. The battery according to claim 7, wherein The length of the vertical side is H, 0.5mm≤H≤2mm.

9. The battery according to claim 6, wherein The thickness of the convex hull is T, 0.1 mm≤T≤0.6 mm.

10. The battery according to any one of claims 1 or 2 or 4 to 9, wherein: The winding cores (1) located in the same shell (2) are connected in parallel.

11. The battery according to any one of claims 4 to 9, further comprising a cover plate (6), the body (21) having openings at both ends, the cover plate (6) being arranged on a side of the body (21) away from the upper cover (22) and covering one of the openings, the first current collecting disk (3) being arranged close to the upper cover (22), the second current collecting disk (5) being arranged close to the cover plate (6), a reinforcing rib (61) being arranged on a side of the cover plate (6) facing the second current collecting disk (5), and the reinforcing rib (61) at least partially abutting against the second current collecting disk (5).

12. The battery according to claim 11, wherein There is a gap between the portion of the cover plate (6) where no reinforcing ribs are provided and the second current collecting plate (5), and the distance of the gap is D, 0.2 mm≤D≤0.7 mm.

13. The battery according to claim 11, wherein An explosion-proof notch (63) is provided on a side of the cover plate (6) away from the second current collecting plate (5).

14. The battery according to claim 13, wherein The thickness of the portion of the cover plate (6) provided with the explosion-proof notch (63) is 0.05 mm to 0.12 mm.

15. A battery pack comprising the battery according to any one of claims 1 to 14.

16. The battery pack according to claim 15, wherein: The batteries are arranged in a plurality of rows, and the batteries in two adjacent rows are arranged at intervals.

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