Battery and battery pack

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 in particular to batteries and battery packs. [Background technology]

[0002] In typical power battery packs currently available on the market, a plurality of individual batteries are first power-connected via external power connection parts to form a battery module, and then the module is assembled into a battery pack.

[0003] The frames and structural members that make up the modules generally have a certain level of mechanical strength and can support, fix and protect the individual battery cells. However, there are many mounting structures that make up the modules and battery packs, which not only increase costs but also increase the weight of the entire battery pack. The mounting structures take up a lot of space, resulting in a low capacity and low energy density relative to the individual battery cells of the power battery pack. Summary of the Invention [Problem to be solved by the invention]

[0004] In order to overcome at least one of the shortcomings described in the above prior art, the present invention provides a battery and a battery pack that can increase the number and capacity of individual battery cells, thereby effectively improving the battery energy density. [Means for solving the problem]

[0005] The technical solutions adopted in the present invention to solve the problems are as follows:

[0006] According to a first aspect, the present invention provides a battery, comprising: At least two winding cores; a case in which the winding core is provided inside and in which at least two extending portions communicating with each other are provided around a central axis of the case; Each of the extensions is filled with one of the winding cores, and a battery is provided in which the number of the extensions and the number of the winding cores match.

[0007] By configuring it in this manner, multiple winding cores can be packed into one case, and the single case can protect the multiple winding cores, effectively improving the battery energy density and reducing the number of structural members.

[0008] According to one preferred embodiment, the number of the extension parts provided is 2 to 6.

[0009] According to one preferred embodiment, the case includes a main body having the extension portion, and an upper lid that covers an end face of the winding core.

[0010] According to one preferred embodiment, the present invention further includes two current collecting disks disposed in the case, the end faces of which are parallel to the end face of the upper cover, The two current collecting disks are defined as a first current collecting disk and a second current collecting disk, respectively, 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 a pole, and the current collecting disk adjacent to the top cover is welded to the pole.

[0012] According to one preferred embodiment, the current collecting disk adjacent to the top cover is provided with a boss, which is directed towards the pole and is welded to the pole.

[0013] According to one preferred embodiment, the current collecting disk remote from the top cover is provided with a vertical edge, said vertical edge being welded to a side wall of the 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, the winding cores located in the same case are connected in parallel.

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

[0018] According to one preferred embodiment, there is a gap between the portion of the cover plate not provided with the reinforcing ribs and the second current collecting disk, the distance of the gap being defined as D, and 0.2 mm≦D≦0.7 mm.

[0019] According to one preferred embodiment, the cover plate is provided with an explosion-proof cut on its side facing away from the second collector disk.

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

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

[0022] According to one preferred embodiment, the batteries are provided in a plurality of rows, and adjacent two rows of the batteries are provided with a gap therebetween. Effect 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) Multiple winding cores are packed into one case, and a single case can protect multiple winding cores, effectively improving the battery energy density and reducing the number of structural members; 2) Multiple batteries are directly assembled into a battery pack, and there is no need to form modules and then assemble them into a battery pack, which saves battery arrangement space and greatly improves the energy of the battery pack; 3) The case has 2 to 6 extensions, which increase the surface heat dissipation area of ​​the battery and are advantageous for heat management control of the battery pack. [Brief description of the drawings]

[0024] [Figure 1] FIG. 2 is an exploded view of the three-dimensional structure of a battery according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an exploded view of the three-dimensional structure of a case according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a plan view of a case in an embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of a battery according to an embodiment of the present invention. [Diagram 5] FIG. 4 is a three-dimensional structural view of a cover plate according to an embodiment of the present invention. [Figure 6] 4 is a schematic diagram of a welding mark between a first current collecting disk and a winding core in an embodiment of the present invention. [Figure 7] FIG. 4 is a schematic diagram of welding the case and the first current collecting disk in an embodiment of the present invention. [Figure 8] FIG. 4 is a schematic diagram of welding the case and the second current collecting disk in an embodiment of the present invention. [Figure 9] FIG. 2 is a plan view of a battery arrangement in an embodiment of the present invention. [Figure 10] FIG. 2 is a plan view showing an arrangement of battery packs in an embodiment of the present invention. [Figure 11] FIG. 10 is a diagram showing the three-dimensional structure of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] In order to be better understood and implemented, the technical solutions of the embodiments of the present invention are clearly and completely described hereinafter in conjunction with the drawings of the embodiments of the present invention.

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

[0027] In describing the present invention, unless expressly specified and limited, the terms "first", "second" are merely for descriptive purposes and should not be understood as indicating or implying relative importance. The term "multiple" refers to two or more than two, and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "a" object is intended to indicate one of a possible plurality of such objects as well.

[0028] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used in the present specification are only for describing specific embodiments and are not intended to limit the present application. The terms "comprise" and "have" and any variations thereof in the present specification, claims and the above description of the drawings are intended to cover non-exclusive inclusions.

[0029] Furthermore, in the description of the present invention, directional terms such as "up", "down", "in", "out" and the like are described in terms of angles shown in the drawings and should not be understood as limiting specific embodiments. Also, when the context refers to an element or feature being connected "up", "down", or "in", "out" of another element(s), it should be understood that it may not only be directly connected to the "up", "down", or "in", "out" of the other element(s), but also indirectly connected to the "up", "down", or "in", "out" of the other element(s) via an intermediate element.

[0030] Referring to FIG. 1, the present invention discloses a battery including a core 1 and a case 2, the core 1 being a cylindrical core 1 and being disposed in a case 2, the case 2 being provided with at least two extensions around its central axis, one core 1 being filled in each extension, and the number of extensions being equal to the number of cores 1. Since multiple cores 1 are filled in one case 2 and a single case 2 can protect multiple cores 1, each core 1 does not need to correspond to one case 2, which reduces the material required to manufacture the case 2, further reduces the weight of a single battery, effectively improves the battery energy density, and reduces the number of structural members. Since multiple extensions are provided, the surface heat dissipation area of ​​the battery is increased, which is advantageous for the thermal management control of the battery pack.

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

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

[0033] As shown in Figures 3 to 6, the case 2 in this embodiment has three extensions and is petal-like extending outward, and the shape of the first current collecting disk 3 and / or the second current collecting disk 5 matches the shape of the top cover 22. Figure 6 is a schematic diagram of the welding marks between the first current collecting disk 3 and the winding core 1 in this embodiment, and A shown in the figure is the welding mark path, which ensures that the first current collecting disk 3 is welded to each of the three winding cores 1. After the first current collecting disk 3 is welded to the winding core 1, the first current collecting disk 3 and a part of the winding core 1 are wrapped with a spacer tape to prevent the tab from coming into contact with the case 2 after it is turned outward, causing a battery short circuit. Then, the insulating gasket 4 is placed in the case 2, and is provided between the top cover 22 and the first current collecting disk 3, and the first current collecting disk 3 wrapped with the spacer tape and the winding core 1 are placed in the case 2, and the pole 25 and the boss of the first current collecting disk 3 are welded and connected by a laser beam in the welding direction shown in Figure 7, and the pole 25 is electrically connected to the circuit of the first current collecting disk 3, and then the pole seal nail 7 is welded to the pole 25 to complete the sealing of the terminal side, specifically, the inner seal ring 23 and the outer seal ring 24 are provided on both sides of the pole 25, and the sealing property of the end of the pole 25 is further improved. The second current collecting disk 5 has a vertical side, and the vertical side and the side wall of the body 21 are welded and connected by a laser beam in the welding direction shown in Figure 8, and the length of the vertical side is defined as H, which is 0.5mm≦H≦2mm, and the second current collecting disk 5 is welded to the case 2, so that the case 2 is electrified and the circuit is completed. The reason why the second current collecting disk 5 and the cover plate 6 are not welded is to reduce the conductive wiring and the internal resistance of the battery. The battery in this embodiment further includes a cover plate 6, both ends of the body 21 are open, the cover plate 6 is provided on the side of the body 21 away from the top lid 22 and covers one of the openings, and the cover plate 6 with the liquid injection hole is welded to the periphery of the case 2. Finally, the inside of the case 2 is injected 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 complete sealing of the battery.

[0034] Specifically, as shown in Fig. 5, the second current collecting disk 5 is provided adjacent 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, and at least a part of the reinforcing rib 61 abuts against the second current collecting disk 5, further compressing the winding core 1 and preventing the winding core 1 from shaking. There is no interference between the part of the cover plate 6 where the reinforcing rib 61 is not provided and the second current collecting disk 5, and the distance of the gap is defined as D as 0.2 mm ≦ D ≦ 0.7 mm as shown in Fig. 2, and the cover plate 6 does not conduct electricity with the winding core 1, reducing the conductive wiring and reducing the internal resistance of the battery.

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

[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 configuring in this manner, it is advantageous for standardizing design and assembly, and is convenient for mass production.

[0037] The present invention further provides a battery pack including a plurality of the batteries described above, in which the plurality of batteries are directly assembled into a battery pack, without the need to form a module and then assemble it into a battery pack, thus saving the battery arrangement space and greatly improving the energy of the battery pack. The batteries are arranged in a plurality of rows, and the batteries in two adjacent rows located at the ends are spaced apart, as shown in Fig. 9, there are three batteries with the same shape and size in Fig. 9, each battery is provided with three extensions, and the three batteries are defined as a first stack 100, a second stack 200 and a third stack 300, respectively, the first stack 100 and the second stack 200 are located in the same row, and the third stack 300 is a stack of the first stack 100 and the second stack 200, respectively. The first integration body 100 is fitted between the first and second integration bodies 200, a first extension portion 110 is provided in the first integration body 100, a second extension portion 210 is provided in the second integration body 200, a gap exists between the first extension portion 110 and the second extension portion 210, and a third extension portion 310 is provided in the gap between the first extension portion 110 and the second extension portion 210, and both sides are abutted against the first integration body 100 and the second integration body 200, respectively.

[0038] 10 and 11, when multiple rows of batteries are provided and each row has multiple stacks, the arrangement in Fig. 9 is similarly applied to Fig. 10 and 11, and the repeated parts will not be described any more. In Fig. 10 and 11, the battery pack further includes a fourth stack 400, which is provided at an end of the row, and two extensions of the fourth stack 400 are respectively abutted against extensions of two symmetrically provided third stacks 300, thereby improving the space utilization rate of the end.

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

[0040] A plurality of winding cores 1 are packed in one case 2, and the single case 2 can protect the plurality of winding cores 1, effectively improving the battery energy density and reducing the number of structural members. Multiple batteries are directly assembled into a battery pack, without the need to form modules and then assemble them into a battery pack, which saves battery arrangement space and greatly improves the energy of the battery pack. Case 2 is provided with 2 to 6 extensions, which increase the surface heat dissipation area of ​​the battery, and are advantageous for heat management control of the battery pack.

[0041] The technical means disclosed in the present invention are not limited to the technical means disclosed in the above embodiments, but include any combination of the above technical features. It should be noted that those skilled in the art can make some improvements and refinements without departing from the principle of the present invention, and these improvements and refinements can also be regarded as the protection scope of the present invention. [Explanation of symbols]

[0042] 1--core, 2--case, 21--main body, 22--top cover, 23--inner seal ring, 24--outer seal ring, 25--pole, 3--first current collecting disk, 4--insulating gasket, 5--second current collecting disk, 6--cover plate, 61--reinforcing rib, 62--filling hole, 63--explosion-proof slit, 7--pole seal nail, 8--cover plate seal nail, 100--first stack, 110--first extension, 200--second stack, 210--second extension, 300--third stack, 310--third extension, 400--fourth stack.

Claims

1. A battery, At least two winding cores (1), and a case (2) in which the winding core (1) is provided and in which at least two extending portions communicating with each other are provided around the central axis of the case (2), A battery characterized in that one of the winding cores (1) is filled in each of the extension parts, and the number of the extension parts and the number of the winding cores (1) match.

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

3. 3. The battery according to claim 1, wherein the case (2) includes a main body (21) having the extension portion and a top cover (22) that covers an end face of the winding core (1).

4. The case (2) further includes two current collecting disks, the planes on which the end faces of which lie parallel to the plane on which the end faces of the upper cover (22) lie, provided within the case (2); 4. The battery according to claim 3, wherein the two current collecting disks are 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), respectively, and are welded to tabs of the winding core (1).

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

6. 6. The battery according to claim 5, wherein the current collecting disk adjacent to the top cover (22) is provided with a boss, the boss being directed toward the pole (25) and welded to the pole (25).

7. 5. The battery according to claim 4, wherein the current collecting disks facing away from the top cover (22) are provided with longitudinal sides, which are welded to the side walls of the body (21).

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

9. 7. The battery of claim 6, wherein the thickness of the boss is defined as T, and 0.1 mm≦T≦0.6 mm.

10. 10. The battery according to claim 1, 2, or 4 to 9, wherein the winding cores (1) located in the same case (2) are connected in parallel.

11. The battery according to any one of claims 4 to 9, further comprising a cover plate (6), wherein both ends of the main body (21) are open, the cover plate (6) is provided on a side of the main body (21) away from the top lid (22) and covers one of the openings, the first current collecting disk (3) is provided close to the top lid (22), the second current collecting disk (5) is provided close to the cover plate (6), and a reinforcing rib (61) is provided on the cover plate (6) on a side facing the second current collecting disk (5), and at least a portion of the reinforcing rib (61) abuts against the second current collecting disk (5).

12. 12. The battery according to claim 11, wherein a gap exists between the portion of the cover plate (6) where the reinforcing ribs are not provided and the second current collecting disk (5), the distance of the gap being defined as D, and 0.2 mm≦D≦0.7 mm.

13. 12. A battery according to claim 11, characterized in that the cover plate (6) is provided with an explosion-proof slit (63) on the side facing away from the second current collecting disc (5).

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

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

16. 16. The battery pack according to claim 15, wherein the batteries are arranged in a plurality of rows, and two adjacent rows of the batteries are arranged with a gap therebetween.

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