EP-4742385-A1 - BATTERY AND BATTERY PACK

EP4742385A1EP 4742385 A1EP4742385 A1EP 4742385A1EP-4742385-A1

Abstract

The present application relates to the technical field of batteries, and discloses a battery and a battery pack. The battery includes a shell, an electrode set, and a negative electrode cover plate. The shell includes a bottom wall located at one end, and the bottom wall includes a bottom wall body and an elastic rib surface recessed inward from the bottom wall body; the electrode set is arranged in the shell, the electrode set is electrically connected to at least a portion of the elastic rib surface, and the elastic rib surface is suitable for elastic deformation along a height direction of the electrode set; the negative electrode cover plate is arranged on the elastic rib surface, and the electrode cover plate is connected to the shell. When the electrode set has a large manufacturing error in height, the elastic rib surface can compensate for the height of the electrode set to compensate for low height accuracy of the electrode set, thereby increasing product processing flexibility and improving product yield and performance. The electrode set is electrically connected to at least a portion of the elastic rib surface, thereby canceling a negative electrode connecting piece, reducing the quantity of components, greatly lowering product costs, simplifying an assembly process, and improving production efficiency, and achieving high market competitiveness.

Inventors

YUAN, Yue
JIANG, ZHEN
YAN, Huailei
GONG, Weihong

Assignees

SVOLT Energy Technology Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240703

Claims (10)

A battery, comprising: a shell comprising a bottom wall located at one end, wherein the bottom wall comprises a bottom wall body and an elastic rib surface recessed inward from the bottom wall body; an electrode set arranged in the shell, wherein the electrode set is electrically connected to at least a portion of the elastic rib surface, and the elastic rib surface is suitable for elastic deformation along a height direction of the electrode set; and a negative electrode cover plate arranged on the elastic rib surface, wherein the electrode cover plate is connected to the shell.
The battery as claimed in claim 1, wherein the elastic rib surface comprises at least two welding zones and at least two isolation zones, the welding zones and the isolation zones are alternately arranged around a center of the electrode set, and the welding zones are welded to the electrode set in a penetrating manner.
The battery as claimed in claim 2, wherein a ratio of an area of the welding zones to an area of a bottom surface of the electrode set is not less than 2/5.
The battery as claimed in claim 2 or 3, wherein the isolation zones are through holes that penetrate through the elastic rib surface.
The battery as claimed in claim 2 or 3, wherein the shell is cylindrical, the elastic rib surface is annular, the welding zones are sector-shaped zones centered on the elastic rib surface, and the welding zones are uniformly spaced around the center of the elastic rib surface.
The battery as claimed in any one of claims 1 to 3, wherein a deformation range of the elastic rib surface along the height direction of the electrode set is -0.3 mm to 0.3 mm.
The battery as claimed in any one of claims 1 to 3, wherein the elastic rib surface and the bottom wall of the shell are integrally formed.
The battery as claimed in any one of claims 1 to 3, further comprising a positive electrode cover plate, wherein the positive electrode cover plate comprises a positive electrode cover plate body and a recessed portion located in the middle of the positive electrode cover plate body and facing towards the electrode set, a periphery of the positive electrode cover plate body is welded to a periphery of the other end of the shell, the recessed portion is provided with a mounting hole, an electrode terminal is connected to the mounting hole through an insulating seal, and the electrode terminal is electrically connected to a positive electrode of the electrode set.
The battery as claimed in claim 8, wherein the positive electrode cover plate further comprises a raised portion away from the electrode set, the raised portion is arranged around the recessed portion, an inner ring of the raised portion is connected to the recessed portion, and an outer ring of the raised portion is connected to the positive electrode cover plate body; the raised portion is provided with an explosion-proof valve, and the negative electrode cover plate is provided with an injection hole.
A battery pack, comprising two batteries as claimed in one of claims 1 to 9.

Description

CROSS REFERENCE TO RELATED APPLICATION The present application claims priority to Chinese Patent Application No. 202310806634.5 filed with the China National Intellectual Property Administration on July 3, 2023, and entitled "BATTERY AND BATTERY PACK", which is incorporated herein by reference in entirety. TECHNICAL FIELD The present application relates to the technical field of batteries, and specifically relates to a battery and a battery pack. BACKGROUND ART With the increasing maturity of lithium-ion battery technology, power batteries, as a new type of batteries, are widely used in electric vehicles, and the performance and safety requirements for these batteries continue to rise. Electrode structures of cylindrical batteries currently on the market include components such as an upper plastic component, a lower plastic component, an electrode terminal, a sealing ring, a positive electrode connecting piece, a negative electrode connecting piece, a negative electrode cover plate, a sealing cover plate, and a sealing nail. The existing electrode structures have the following disadvantages: a large number of components lead to high cost and a complex assembly process; especially numerous welding steps are highly prone to poor performance and quality problems; and low manufacturing accuracy in a height direction of an electrode set results in low battery yield. SUMMARY In view of this, the present application provides a battery and a battery pack to solve at least one of the following technical problems: numerous battery components, high cost, complex assembly process, low production efficiency, and low yield. In a first aspect, the present application provides a battery, including a shell, an electrode set, and a negative electrode cover plate. The shell includes a bottom wall located at one end, and the bottom wall includes a bottom wall body and an elastic rib surface recessed inward from the bottom wall body; the electrode set is arranged in the shell, the electrode set is electrically connected to at least a portion of the elastic rib surface, and the elastic rib surface is suitable for elastic deformation along a height direction of the electrode set; the negative electrode cover plate is arranged on the elastic rib surface, and the electrode cover plate is connected to the shell. According to the battery provided in the present application, since the elastic rib surface provided on the bottom wall of the shell can provide support for the electrode set, when the electrode set has a large manufacturing error in height, the elastic rib surface can compensate for the height of the electrode set to compensate for low height accuracy of the electrode set, thereby increasing product processing flexibility and improving product yield and performance. The elastic rib surface is recessed, and the electrode set is electrically connected to at least a portion of the elastic rib surface, thereby canceling a negative electrode connecting piece, reducing the quantity of components, greatly lowering product costs, simplifying an assembly process, improving production efficiency, and achieving high market competitiveness. In an optional implementation, the elastic rib surface includes at least two welding zones and at least two isolation zones, the welding zones and the isolation zones are alternately arranged around a center of the electrode set, and the welding zones are welded to the electrode set in a penetrating manner. Such design ensures that the elastic rib surface has sufficient elasticity, improves the performance of compensating for the height manufacturing accuracy of the electrode set by the elastic rib surface, and ensures stable battery performance. In an optional implementation, a ratio of an area of the welding zones to an area of a bottom surface of the electrode set is not less than 2/5. When the ratio of the area of the welding zones to the area of the bottom surface of the electrode set is controlled within a range of not less than 2/5, a current-carrying capacity can be ensured. When the ratio exceeds this range, the welding area is small, the welding performance is reduced, and the stable battery performance will be affected. Preferably, the ratio of the area of the welding zones to the area of the bottom surface of the electrode set is 1/2. In an optional implementation, the isolation zones are through holes that penetrate through the elastic rib surface. The through holes are simple, easy to process, and beneficial to improving battery production efficiency. In an optional implementation, the shell is cylindrical, the elastic rib surface is annular, the welding zones are sector-shaped zones centered on the elastic rib surface, and the welding zones are uniformly spaced around the center of the elastic rib surface. Such design ensures that the electrode set and the elastic rib surface are welded radially from the inside out, increasing the welding area and improving welding performance and eff