A battery cell and a battery including the same.

Abstract

This invention provides a battery cell and a battery having the same. The battery cell includes two electrode cores and an intermediate connector. Each electrode core has a conductive shell fitted around its outer periphery. Each conductive shell has an electrically connected terminal post. The intermediate connector can electrically connect the positive electrode tab of each of the two electrode cores to one of the two conductive shells, and electrically connect the negative electrode tab of each of the two electrode cores to the other of the two conductive shells. According to this invention, the uniformity of the current density distribution inside the battery cell can be improved, which is beneficial to improving the rate performance of the battery cell, reducing localized degradation inside the battery cell, improving the consistency of the battery cell during use, and extending the overall lifespan of the battery pack.

Description

Technical Field

[0001] This invention belongs to the field of battery manufacturing technology, specifically relating to a battery cell and a battery including the same. Background Technology

[0002] With the introduction of blade batteries, longer battery cells are increasingly favored by OEMs, leading more and more cell manufacturers to develop longer prismatic cells, which has also spurred numerous related structural innovations. One related technology proposes a one-stop cell, initially intended to solve the problem of difficult casing for longer cells. However, its irregular casing structure is difficult to manufacture, costly, and includes a flange structure that occupies significant unused space. Furthermore, achieving proper insulation at the flange poses a significant safety hazard, hindering industrial production. Other related technologies propose designing tabs on the long side to address the uneven current density distribution within the long cell. However, this structure occupies considerable internal space, significantly reducing the cell's gravimetric and volumetric energy densities. Still other existing technologies propose a special electrode structure where uncoated foil is provided on the long side to provide additional current. This solution also significantly reduces the cell's gravimetric and volumetric energy densities. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a battery cell and a battery including the same, so as to solve the problem of uneven current distribution inside the battery cell, while ensuring the space utilization rate of the battery cell and thus ensuring the energy density of the battery cell.

[0004] To solve or improve the above-mentioned technical problems to a certain extent, according to one aspect of the present invention, a battery cell is provided, comprising: two electrode cores and an intermediate connector, wherein each electrode core is fitted with a conductive shell on its outer periphery, and each conductive shell is electrically connected with an electrode post, and the intermediate connector is capable of electrically connecting the positive electrode tabs of the two electrode cores to one of the two conductive shells, and electrically connecting the negative electrode tabs of the two electrode cores to the other of the two conductive shells.

[0005] In some embodiments, the two electrode cores are arranged at a straight interval along their respective length directions, the intermediate connector is clamped at the interval formed by the two electrode cores, and the pole post is located at the end of the conductive housing away from the intermediate connector.

[0006] In some embodiments, the electrode core is rectangular in shape.

[0007] In some embodiments, the electrode core has a one-end tab structure, and the two electrode cores have oppositely arranged positive tabs and oppositely arranged negative tabs. The intermediate connector includes a positive connector and a negative connector. The opposite sides of the positive connector are respectively connected to the positive tabs of the two electrode cores, and the opposite sides of the negative connector are respectively connected to the negative tabs of the two electrode cores.

[0008] In some embodiments, the positive electrode connector includes a first plate having a positive electrode tab connection portion electrically connected to the positive electrode tab and a first through hole; the negative electrode connector includes a second plate having a negative electrode tab connection portion electrically connected to the negative electrode tab and a second through hole; the first plate and the second plate are arranged parallel to each other and spaced apart; the positive electrode tab connection portion passes through the second through hole and there is a first insulating gap between them; the negative electrode tab connection portion passes through the first through hole and there is a second insulating gap between them.

[0009] In some embodiments, the intermediate connector further includes an insulating connector, wherein both the positive electrode connector and the negative electrode connector are fixedly connected to the insulating connector, and the insulating connector has a portion that fills the first insulating gap and the second insulating gap.

[0010] In some embodiments, one of the two conductive housings is electrically connected to the outer peripheral edge of the first plate, and the other of the two conductive housings is electrically connected to the outer peripheral edge of the second plate.

[0011] In some embodiments, the insulating connector is formed by injection molding; and / or, the negative electrode connector is a copper-aluminum composite plate structure; and / or, both the positive electrode connector and the negative electrode connector are stamped parts.

[0012] In some embodiments, a first insulating film is sleeved on the outer side of the two conductive shells; a second insulating film is disposed between the conductive shell and the corresponding electrode core.

[0013] In some embodiments, the conductive housing electrically connected to the negative electrode ear is an aluminum shell, the outer peripheral wall of which is coated with an insulating layer, and / or the conductive housing electrically connected to the positive electrode ear is a steel shell.

[0014] In some embodiments, the electrode post is a cover plate structure capable of sealing the end of the conductive housing away from the intermediate connector. When the electrode post is a positive electrode post, an explosion-proof valve is constructed on it. When the electrode post is a negative electrode post, an injection hole is constructed on it.

[0015] In some embodiments, an insulating sheet is applied to the outer side of the cover structure.

[0016] According to another aspect of the present invention, a battery is provided, comprising the cell described in any of the above embodiments.

[0017] The present invention provides a battery cell and a battery including the same. By using the conductive shell as a current collector, the problem of uneven current distribution inside the battery cell is solved, resulting in higher space utilization without sacrificing energy density. In other words, the technical solution of the present invention can improve the uniformity of current density distribution inside the battery cell, which is beneficial to improving the rate performance of the battery cell, reducing local degradation inside the battery cell, improving the consistency of the battery cell during use, and improving the overall life of the battery pack.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is an exploded three-dimensional structural diagram of a battery cell according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 An exploded view of the three-dimensional structure of the intermediate connector;

[0021] Figure 3 for Figure 1 A three-dimensional structural diagram of the core.

[0022] Figure 4 for Figure 1 A three-dimensional structural diagram of the positive electrode post in the diagram;

[0023] Figure 5 for Figure 1 A three-dimensional structural diagram of the negative electrode post;

[0024] Figure 6 This is a schematic diagram of the current loop of a battery cell using an embodiment of the present invention.

[0025] [Symbol Explanation]

[0026] 1. Core

[0027] 11. Positive electrode ear

[0028] 12. Negative electrode ear

[0029] 2. Intermediate connecting parts

[0030] 21. Positive electrode connector

[0031] 211. First Plate

[0032] 212. Positive electrode connector

[0033] 213. First through hole

[0034] 22. Negative electrode connector

[0035] 221. Second Plate

[0036] 222. Negative electrode ear connection part

[0037] 223. Second through hole

[0038] 23. Insulating connector

[0039] 3. Conductive housing

[0040] 41. Positive electrode post

[0041] 42. Explosion-proof valve

[0042] 43. Negative electrode post

[0043] 44. Injection Hole

[0044] 45. Insulating sheet

[0045] 5. First insulating film

[0046] 6. Second insulating film Detailed Implementation

[0047] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation methods and effects of a battery cell and a battery including the same according to the present invention.

[0048] See also Figures 1 to 6 As shown, according to an embodiment of the present invention, a battery cell is provided, comprising two electrode cores 1 and an intermediate connector 2. Each electrode core 1 has a conductive shell 3 fitted onto its outer periphery. Each conductive shell 3 is electrically connected to a terminal post. The intermediate connector 2 can electrically connect the positive electrode tab 11 of each of the two electrode cores 1 to one of the two conductive shells 3, and electrically connect the negative electrode tab 12 of each of the two electrode cores 1 to the other of the two conductive shells 3. In this technical solution, by using the conductive shell 3 as a current collector (conductive channel), the problem of uneven current distribution within the battery cell is solved, resulting in higher space utilization without sacrificing energy density. That is, the technical solution of the present invention can improve the uniformity of current density distribution within the battery cell, which is beneficial for improving the rate performance of the battery cell, reducing localized degradation within the battery cell, improving the consistency of the battery cell during use, and enhancing the overall lifespan of the battery pack.

[0049] In this embodiment, the electrode core 1 is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator. The separator is disposed between each adjacent positive and negative electrode sheet, and the positive electrode tab 11 and the negative electrode tab 12 of the electrode core 1 are disposed on the same side.

[0050] In one specific implementation, two electrode cores 1 are arranged at a straight interval along their respective length directions, with an intermediate connector 2 clamped at the interval formed by the two electrode cores 1. The electrode post is located at the end of the conductive shell 3 away from the intermediate connector 2. Preferably, the electrode core 1 is rectangular. This design allows for a more regular shape of the battery cell, thereby reducing the cost of the corresponding structural components and the difficulty of processing.

[0051] See details Figure 3 As shown, in some embodiments, the electrode core 1 has a one-end tab structure, with the positive tabs 11 and negative tabs 12 of the two electrode cores 1 respectively arranged opposite each other. The intermediate connector 2 includes a positive connector 21 and a negative connector 22. The opposite sides of the positive connector 21 are connected to the positive tabs 11 of the two electrode cores, and the opposite sides of the negative connector 22 are connected to the negative tabs 12 of the two electrode cores. See here for details. Figure 6 As shown, the current of the electrode core 1 is introduced and exported from the middle position of the cell, which further optimizes the overall structure of the cell, makes the overall appearance of the cell more regular, and further reduces the cost of structural components and the difficulty of processing.

[0052] See Figure 2 As shown, in a preferred embodiment, the positive electrode connector 21 includes a first plate 211, on which a positive electrode tab connection portion 212 electrically connected to the positive electrode tab 11 and a first through hole 213 are provided. The negative electrode connector 22 includes a second plate 221, on which a negative electrode tab connection portion 222 electrically connected to the negative electrode tab 12 and a second through hole 223 are provided. The first plate 211 and the second plate 221 are arranged in parallel and spaced apart. The positive electrode tab connection portion 212 passes through the second through hole 223 and there is a first insulating gap between them. The negative electrode tab connection portion 222 passes through the first through hole 213 and there is a second insulating gap between them.

[0053] In this technical solution, the electrical parallel connection of two opposite one-end output electrode structures is achieved by the cooperation of the positive electrode connecting part 212 with the second through hole 223 and the cooperation of the negative electrode connecting part 222 with the first through hole 213. The structure is simple and reasonable. In the specific implementation process, the opposite sides of the positive electrode connecting part 212 are welded to the positive electrode 11 of the two electrode cores 1 as a whole, and the opposite sides of the negative electrode connecting part 222 are welded to the negative electrode 12 of the two electrode cores 1 as a whole to achieve the aforementioned electrical parallel connection.

[0054] Furthermore, one of the two conductive shells 3 is electrically connected to the outer peripheral edge of the first plate 211, and the other of the two conductive shells 3 is electrically connected to the outer peripheral edge of the second plate 221. This outer peripheral edge can be, for example, the outer circumferential wall of the first plate 211 and the second plate 221, or it can be the outer edge of one side of the first plate 211 and the second plate 221 facing the electrode core 1. This invention does not impose any particular limitation. The aforementioned welding can be, for example, a laser side welding process.

[0055] See you again Figure 2 As shown, the intermediate connector 2 also includes an insulating connector 23. Both the positive electrode connector 21 and the negative electrode connector 22 are fixedly connected to the insulating connector 23, and the insulating connector 23 has portions that fill the first insulating gap and the second insulating gap. In this technical solution, the insulating connector 23 serves as both a fixing carrier for the positive electrode connector 21 and the negative electrode connector 22 and an insulating component for both, enabling the intermediate connector 2 to effectively prevent short circuits between the positive and negative electrodes while maintaining conductivity.

[0056] The insulating connector 23 is formed by injection molding, specifically by injection molding of insulating plastic, which enables the positive electrode connector 21 and the negative electrode connector 22 to be reliably connected as one unit and has high insulation performance.

[0057] Both the positive electrode connector 21 and the negative electrode connector 22 are stamped parts, which are easy to process. The negative electrode connector 22 is preferably a copper-aluminum composite plate structure.

[0058] In some embodiments, a first insulating film 5, such as a PET blue insulating film, is sleeved on the outer side of the two conductive shells 3; a second insulating film 6, such as an insulating Mylar film, is provided between the conductive shell 3 and its corresponding electrode core 1 to improve the electrical safety performance of the battery cell.

[0059] In one specific embodiment, the conductive housing 3 electrically connected to the negative electrode 12 is an aluminum housing, and the outer peripheral wall of the aluminum housing is sprayed (overall sprayed) with an insulating layer to prevent corrosion; the conductive housing 3 electrically connected to the positive electrode 11 is a steel housing.

[0060] The electrode post is a cover plate structure that can seal the end of the conductive housing 3 away from the intermediate connector 2. When the electrode post is the positive electrode post 41 (e.g.) Figure 4 As shown), it is equipped with an explosion-proof valve 42. When the pole is the negative pole 43 (as shown), Figure 5 As shown), it has an injection hole 44. Furthermore, an insulating sheet 45 (black insulating sticker) is laid (e.g., pasted) on the outside of the cover plate structure, and the specific structure of the insulating sheet 45 matches the corresponding cover plate structure.

[0061] In the specific manufacturing process of the battery cell of the present invention, the tabs (i.e., the aforementioned positive tab 11 and negative tab 12) of the electrode core 1 (which is a structure with one end of the tab and the two electrode cores 1 being mirror images of each other) are ultrasonically pre-welded and then laser-welded together with the intermediate connector 2, and the two electrode cores 1 are in parallel structure; then an insulating Mylar film is put on, and the insulating Mylar film (i.e., the aforementioned second insulating film 6) is heat-fused and fixed to the intermediate connector 2; then the aluminum shell (i.e., the aforementioned conductive shell 3) is put on from both sides, and the positive and negative electrode cover plates (i.e., the aforementioned positive electrode post 41 and negative electrode post 43) are clipped on at both ends. Then, the aluminum shell, the intermediate connector 2, and the positive and negative electrode cover plates are welded together by laser side welding process. After liquefaction formation treatment, surface insulation treatment is performed, an insulator (i.e., the aforementioned insulating sheet 45) is attached, and a blue film (i.e., the aforementioned first insulating film 5) is wrapped.

[0062] In addition, for safety reasons, an insulating layer can be sprayed onto the surface and interior of the aluminum shell.

[0063] According to an embodiment of the present invention, a battery is also provided, comprising the cell of any of the above embodiments.

[0064] This invention solves the problem of uneven current distribution inside the battery cell by using the conductive shell as a current collector, resulting in higher space utilization without sacrificing energy density. In other words, the technical solution of this invention can improve the uniformity of current density distribution inside the battery cell, which is beneficial to improving the rate performance of the battery cell, reducing local degradation inside the battery cell, improving the consistency of the battery cell during use, and extending the overall lifespan of the battery pack.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A battery cell, characterized in that, include: Two pole cores (1) and an intermediate connector (2). Each pole core (1) is fitted with a conductive shell (3) on its outer periphery. Each conductive shell (3) is electrically connected to a pole post. The intermediate connector (2) can electrically connect the positive electrode tab (11) of each of the two pole cores (1) to one of the two conductive shells (3) and electrically connect the negative electrode tab (12) of each of the two pole cores (1) to the other of the two conductive shells (3). The intermediate connector (2) includes a positive electrode connector (21), a negative electrode connector (22), and an insulating connector (23). Both the positive electrode connector (21) and the negative electrode connector (22) are fixedly connected to the insulating connector (23). The positive electrode connector (21) includes a first plate (211), which has a positive electrode tab connection portion (212) electrically connected to the positive electrode tab (11) and a first through hole (213). The negative electrode connector (22) includes a first through hole (213). Two plates (221) are provided, the second plate (221) having a negative electrode connecting part (222) electrically connected to the negative electrode (12) and a second through hole (223), the first plate (211) and the second plate (221) are arranged in parallel and spaced apart, the positive electrode connecting part (212) passes through the second through hole (223) and there is a first insulating gap between them, the negative electrode connecting part (222) passes through the first through hole (213) and there is a second insulating gap between them.

2. The battery cell according to claim 1, characterized in that, The two pole cores (1) are arranged in a straight line at intervals along their respective length directions, the intermediate connector (2) is clamped at the interval formed by the two pole cores (1), and the pole post is located at the end of the conductive housing (3) away from the intermediate connector (2); and / or, the pole core (1) is rectangular.

3. The battery cell according to claim 2, characterized in that, The electrode core (1) has a one-end tab structure, and the two electrode cores (1) have a positive tab (11) and a negative tab (12) arranged opposite to each other.

4. The battery cell according to claim 1, characterized in that, The insulating connector (23) has a portion that fills the first insulating gap and the second insulating gap.

5. The battery cell according to claim 1, characterized in that, One of the two conductive housings (3) is electrically connected to the outer peripheral edge of the first plate (211), and the other of the two conductive housings (3) is electrically connected to the outer peripheral edge of the second plate (221).

6. The battery cell according to claim 4, characterized in that, The insulating connector (23) is formed by injection molding; and / or the negative electrode connector (22) is a copper-aluminum composite plate structure; and / or both the positive electrode connector (21) and the negative electrode connector (22) are stamped parts.

7. The battery cell according to claim 2, characterized in that, A first insulating film (5) is provided on the outer side of the two conductive shells (3); a second insulating film (6) is provided between the conductive shell (3) and the corresponding electrode core (1).

8. The battery cell according to any one of claims 1 to 7, characterized in that, The conductive housing (3) electrically connected to the negative electrode (12) is an aluminum shell, and the outer peripheral wall of the aluminum shell is coated with an insulating layer, and / or the conductive housing (3) electrically connected to the positive electrode (11) is a steel shell.

9. The battery cell according to any one of claims 1 to 7, characterized in that, The pole is a cover plate structure that can seal the end of the conductive housing (3) away from the intermediate connector (2). When the pole is a positive pole (41), an explosion-proof valve (42) is constructed on it. When the pole is a negative pole (43), an injection hole (44) is constructed on it.

10. The battery cell according to claim 9, characterized in that, An insulating sheet (45) is applied to the outside of the cover plate structure.

11. A battery, characterized in that, Includes the battery cell according to any one of claims 1 to 10.

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