Lithium battery

Abstract

The utility model belongs to the technical field of lithium ion batteries, and discloses a lithium battery which comprises a battery shell internally provided with a core bag in a matched manner, a positive top cover and a negative top cover which are mounted at the end parts of the battery shell are respectively arranged at two ends of the core bag, and the core bag is in a strip shape capable of improving the overall space utilization rate of a battery pack; the positive top cover comprises a positive terminal and a positive pole which are connected in a welding manner; and the negative top cover comprises a negative terminal and a negative pole which are connected in a laser penetration welding manner. According to the lithium battery pack, the core pack is designed to be in the long strip shape capable of improving the overall space utilization rate of the battery pack, more lithium batteries can be arranged for the battery pack, the overall endurance mileage is further improved, the positive terminal and the positive pole column are connected in a welding mode, the negative terminal and the negative pole column are connected in a laser penetration welding mode, and the service life of the battery pack is prolonged. And the contact area is increased while the working procedures are reduced, a larger overflowing cross section can be provided, and more endurance mileage can be supplemented in a short time.

Description

Technical Field

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

[0002] As lithium-ion batteries are increasingly used in the power sector, the battery life issue has become an issue that can affect consumers' purchasing choices. There are currently two main ways to solve the battery life issue on the market. The first is to make the battery pack itself have a large energy to give the car more mileage, and the second is to make the battery have super fast charging capabilities to replenish sufficient mileage in a short time. However, there is still no battery that can combine high space utilization and fast charging capabilities. Utility Model Content

[0003] The purpose of the utility model is to provide a lithium battery to solve the above problems existing in the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A lithium battery comprises a battery shell with a core pack arranged therein, wherein two ends of the core pack are respectively provided with a positive electrode top cover and a negative electrode top cover installed on the ends of the battery shell, wherein the core pack is in a long strip shape capable of improving the overall space utilization of the battery pack; the positive electrode top cover comprises a positive electrode terminal and a positive electrode pole connected by welding; the negative electrode top cover comprises a negative electrode terminal and a negative electrode pole connected by laser penetration welding.

[0006] As a preferred technical solution in the utility model, the positive electrode top cover also includes a positive electrode upper plastic, a positive electrode substrate, a positive electrode lower plastic and a positive electrode sealing ring. The positive terminal, the positive electrode upper plastic, the positive electrode substrate, the positive electrode lower plastic and the positive electrode column are arranged in sequence from the outside to the inside at one end of the battery shell, and one end of the positive electrode column passes through the positive electrode lower plastic, the positive electrode substrate and the positive electrode upper plastic in sequence and is connected to the positive terminal; the positive electrode column is an elliptical structure, and the positive electrode sealing ring is an elliptical sealing ring that is matched and sleeved between the positive electrode column and the positive electrode lower plastic.

[0007] As a preferred technical solution in the utility model, a terminal positioning groove is provided on the upper plastic of the positive electrode, and the positive terminal is installed in the terminal positioning groove; an upper plastic positioning groove is provided on the positive substrate, and the upper plastic of the positive electrode is installed in the upper plastic positioning groove; at least two substrate positioning columns are provided on the lower plastic of the positive electrode, and at least two substrate positioning grooves are provided on the positive substrate, and each substrate positioning column is matched and inserted in a substrate positioning groove.

[0008] As a preferred technical solution in the utility model, the negative electrode top cover also includes a negative electrode upper plastic, a negative electrode substrate, a negative electrode lower plastic and a negative electrode sealing ring. The negative electrode terminal, the negative electrode upper plastic, the negative electrode substrate, the negative electrode lower plastic and the negative electrode pole are arranged in sequence from the outside to the inside at the other end of the battery casing. One end of the negative electrode pole passes through the negative electrode lower plastic, the negative electrode substrate and the negative electrode upper plastic in sequence and is connected to the negative terminal; the negative electrode pole is a long strip structure stamped from a copper plate.

[0009] As a preferred technical solution in the present invention, the negative terminal is a plate-like structure formed by stamping a composite plate.

[0010] As a preferred technical solution in the present invention, the current cross-section of the negative electrode pole is greater than or equal to 128 square millimeters.

[0011] As a preferred technical solution in the present utility model, the current cross-section of the positive electrode column is greater than or equal to 118 square millimeters.

[0012] Beneficial effects: The utility model designs the core pack into a long strip shape that can improve the overall space utilization of the battery pack. According to the battery pack structure, more lithium batteries can be arranged, thereby improving the overall cruising range. The positive terminal and the positive pole are connected by welding, and the negative terminal and the negative pole are connected by laser penetration welding, which reduces the process and increases the contact area, providing a larger current cross-section, thereby adding more cruising range in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0014] Figure 2 It is a side view of the utility model;

[0015] Figure 3 for Figure 2 AA section view;

[0016] Figure 4 for Figure 3 A magnified schematic diagram of part B;

[0017] Figure 5 for Figure 3 Enlarged schematic diagram of part C.

[0018] In the figure: 1-core pack; 2-battery case; 3-positive electrode top cover; 31-positive electrode terminal; 32-positive electrode upper plastic; 33-positive electrode substrate; 34-positive electrode lower plastic; 35-positive electrode sealing ring; 36-positive electrode column; 4-negative electrode top cover; 41-negative electrode terminal; 42-negative electrode upper plastic; 43-negative electrode substrate; 44-negative electrode lower plastic; 45-negative electrode sealing ring; 46-negative electrode column. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0020] Example:

[0021] like Figure 1-Figure 5 As shown, this embodiment provides a lithium battery, including a battery shell 2 with a core pack 1 matched therein, and a positive electrode top cover 3 and a negative electrode top cover 4 installed on the ends of the battery shell 2 are respectively provided at both ends of the core pack 1. The core pack 1 is a long strip shape that can improve the overall space utilization of the battery pack. According to the battery pack structure, more lithium batteries can be arranged, thereby improving the overall cruising range; the positive electrode top cover 3 includes a positive terminal 31 and a positive electrode column 36 connected by welding, which reduces the process and increases the contact area; the negative electrode top cover 4 includes a negative terminal 41 and a negative electrode column 46 connected by laser penetration welding, with a large contact area and a simple structure.

[0022] The utility model designs the core pack 1 into a long strip shape that can improve the overall space utilization of the battery pack. According to the battery pack structure, more lithium batteries can be arranged, thereby improving the overall cruising range. The positive terminal 31 and the positive pole 36 are connected by welding, and the negative terminal 41 and the negative pole 46 are connected by laser penetration welding, which reduces the process and increases the contact area, and can provide a larger current cross-section, thereby adding more cruising range in a short time.

[0023] As a preferred implementation scheme in this embodiment, it needs to be further explained that the positive electrode top cover 3 also includes a positive electrode upper plastic 32, a positive electrode substrate 33, a positive electrode lower plastic 34 and a positive electrode sealing ring 35. The positive terminal 31, the positive electrode upper plastic 32, the positive electrode substrate 33, the positive electrode lower plastic 34 and the positive electrode column 36 are arranged in sequence from the outside to the inside at one end of the battery housing 2. One end of the positive electrode column 36 passes through the positive electrode lower plastic 34, the positive electrode substrate 33 and the positive electrode upper plastic 32 in sequence and is connected to the positive terminal 31; the positive electrode column 36 is an elliptical structure, which can provide a larger current flow cross section, and the positive electrode sealing ring 35 is an elliptical sealing ring that is matched and sleeved between the positive electrode column 36 and the positive electrode lower plastic 34, which can effectively solve the sealing problem.

[0024] As a preferred implementation scheme in this embodiment, it needs to be further explained that the positive electrode upper plastic 32 is provided with a terminal positioning groove, and the positive electrode terminal 31 is installed in the terminal positioning groove; the positive electrode substrate 33 is provided with an upper plastic positioning groove, and the positive electrode upper plastic 32 is installed in the upper plastic positioning groove; the positive electrode lower plastic 34 is provided with at least two substrate positioning posts, and the positive electrode substrate 33 is provided with at least two substrate positioning grooves, and each substrate positioning post is matched and plugged into a substrate positioning groove. Through the above structure, accurate positioning can be easily achieved, and installation is easier.

[0025] As a preferred implementation scheme in this embodiment, it needs to be further explained that the negative electrode top cover 4 also includes a negative electrode upper plastic 42, a negative electrode substrate 43, a negative electrode lower plastic 44 and a negative electrode sealing ring 45, and the negative terminal 41, the negative electrode upper plastic 42, the negative electrode substrate 43, the negative electrode lower plastic 44 and the negative electrode pole 46 are arranged in sequence from the outside to the inside at the other end of the battery housing 2, and one end of the negative electrode pole 46 passes through the negative electrode lower plastic 44, the negative electrode substrate 43 and the negative electrode upper plastic 42 in sequence and is connected to the negative terminal 41; the negative electrode pole 46 is a long strip structure stamped from a copper plate, which can provide a larger current cross section and improve the charging speed.

[0026] As a preferred implementation scheme in this embodiment, it needs to be further explained that the negative terminal 41 is a plate-like structure formed by stamping a composite plate, which provides a large flow cross-section while reducing cost and weight.

[0027] As a preferred implementation scheme in this embodiment, it needs to be further explained that the cross-sectional area of ​​the negative electrode pole 46 is greater than or equal to 128 square millimeters; the cross-sectional area of ​​the positive electrode pole 36 is greater than or equal to 118 square millimeters, which supports the super fast charging capability from the battery structure.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium battery, comprising a battery housing (2) in which a core pack (1) is matched, and the core pack (1) is provided at both ends with a positive electrode top cover (3) and a negative electrode top cover (4) mounted on the end of the battery housing (2), characterized in that: The core pack (1) is in the shape of a long strip capable of improving the overall space utilization of the battery pack; the positive electrode top cover (3) comprises a positive electrode terminal (31) and a positive electrode pole (36) connected by welding; and the negative electrode top cover (4) comprises a negative electrode terminal (41) and a negative electrode pole (46) connected by laser penetration welding.

2. A lithium battery according to claim 1, characterized in that: The positive electrode top cover (3) also includes a positive electrode upper plastic (32), a positive electrode substrate (33), a positive electrode lower plastic (34) and a positive electrode sealing ring (35); the positive electrode terminal (31), the positive electrode upper plastic (32), the positive electrode substrate (33), the positive electrode lower plastic (34) and the positive electrode pole (36) are arranged in sequence from the outside to the inside at one end of the battery housing (2); one end of the positive electrode pole (36) passes through the positive electrode lower plastic (34), the positive electrode substrate (33) and the positive electrode upper plastic (32) in sequence and is connected to the positive electrode terminal (31); the positive electrode pole (36) is an elliptical structure, and the positive electrode sealing ring (35) is an elliptical sealing ring that is matched and sleeved between the positive electrode pole (36) and the positive electrode lower plastic (34).

3. A lithium battery according to claim 2, characterized in that: The positive electrode upper plastic (32) is provided with a terminal positioning groove, and the positive electrode terminal (31) is installed in the terminal positioning groove; the positive electrode substrate (33) is provided with an upper plastic positioning groove, and the positive electrode upper plastic (32) is installed in the upper plastic positioning groove; the positive electrode lower plastic (34) is provided with at least two substrate positioning columns, and the positive electrode substrate (33) is provided with at least two substrate positioning grooves, and each substrate positioning column is matched and plugged into a substrate positioning groove.

4. A lithium battery according to any one of claims 1 to 3, characterized in that: The negative electrode top cover (4) also includes a negative electrode upper plastic (42), a negative electrode substrate (43), a negative electrode lower plastic (44) and a negative electrode sealing ring (45); the negative electrode terminal (41), the negative electrode upper plastic (42), the negative electrode substrate (43), the negative electrode lower plastic (44) and the negative electrode pole (46) are arranged in sequence from the outside to the inside at the other end of the battery housing (2); one end of the negative electrode pole (46) passes through the negative electrode lower plastic (44), the negative electrode substrate (43) and the negative electrode upper plastic (42) in sequence and is connected to the negative electrode terminal (41); the negative electrode pole (46) is a long strip structure formed by stamping a copper plate.

5. A lithium battery according to claim 4, characterized in that: The negative electrode terminal (41) is a plate-shaped structure formed by stamping a composite plate.

6. A lithium battery according to claim 1, characterized in that: The current cross section of the negative electrode column (46) is greater than or equal to 128 square millimeters.

7. A lithium battery according to claim 1, characterized in that: The current cross section of the positive electrode column (36) is greater than or equal to 118 square millimeters.

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