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Winding battery cell, battery and battery module structure

A battery cell and winding core technology, which is applied to battery pack parts, secondary batteries, structural parts, etc., can solve problems such as lithium deposition and powder drop at corners, so as to prevent lithium deposition, prolong service life, and improve safety performance Effect

Pending Publication Date: 2020-10-13
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a winding battery cell for the deficiencies of the prior art, which can improve the problem of excessive stress at the corners of the pole pieces inside the battery core, which leads to powder dropping or even lithium deposition at the corners, and prolong the life of the battery. service life

Method used

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  • Winding battery cell, battery and battery module structure
  • Winding battery cell, battery and battery module structure
  • Winding battery cell, battery and battery module structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0030] A winding cell, comprising a positive electrode sheet 1, a negative electrode sheet 2, and a separator 3 arranged between the positive electrode sheet 1 and the negative electrode sheet 2, and the positive electrode sheet 1, the separator 3, and the negative electrode sheet 2 are wound to form a roll of a hollow structure Core 4, the radian at the corner of winding core 4 is α, 0°figure 1 As shown, the corner can be understood as the angle formed between the pole piece in the horizontal direction of the winding core 4 and the pole piece in the longitudinal direction of the winding core 4 during the winding process of the positive electrode sheet 1, the separator 3 and the negative electrode sheet 2 around the winding needle. There is a smooth transition between the pole pieces in the transverse direction of the core 4 and the pole pieces in the longitudinal direction of the winding core 4 . Because the existing cell winding structure will flatten the wound electrode when...

Embodiment approach 2

[0037] The difference from Embodiment 1 is that: the radian α at the corner of this embodiment is 90°≤α≤120°, the arc edge at the corner of the winding core 4 is an elliptical arc, and the corner of the winding core 4 is a square edge. The number of corners of the winding core 4 is limited to the maximum value to prevent the number of corners of the winding core 4 from being too large, resulting in an increase in production costs, and at the same time it is difficult to match the corresponding housing 5, increasing the difficulty of production; further limiting the radian of the corners of the winding core 4 The range of α satisfies the need to increase the radius of curvature of the positive electrode sheet 1, the separator 3 and the negative electrode sheet 2 during winding, and avoid the 180° corner position of the winding core 4, thereby avoiding the 180° bending of the electrode sheet , to improve the phenomenon of decarburization and powder loss or copper leakage caused b...

Embodiment approach 3

[0040] The difference from Embodiment 1 is that the number of corners of the winding core 4 in this embodiment is 6, and the cross-sectional shape of the hollow structure is ellipse. Such as image 3 As shown, the number of corners of the winding core 4 is limited to an intermediate value, so as to avoid the situation that the corner position of the winding core 4 will appear at 180°, thereby avoiding the 180° bending of the pole piece, and at the same time reducing the difficulty of the production process of the winding core 4 , helps to reduce the production cost of the battery; according to the shape of the combined battery 6, the hollow structure can be designed into an ellipse, which is convenient for placing the elliptical combined battery 6 or battery pack in the hollow structure, which helps to increase the capacity of the battery. In addition, it can also match the internal structure of the car, which helps to improve the flexibility and energy density of the battery ...

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Abstract

The invention belongs to the technical field of battery production and manufacturing, and specifically relates to a winding battery cell. The winding battery cell comprises a positive plate (1), a negative plate (2) and an isolating membrane (3) arranged between the positive plate (1) and the negative plate (2). The positive plate (1), the isolating membrane (3) and the negative plate (2) are wound to form a winding core (4) of a hollow structure, and the radian alpha of the corner of the winding core (4) is smaller than 180 degrees and smaller than 0 degree. According to the invention, the problem of powder falling and even lithium precipitation at the corner due to overlarge stress at the corner of the pole piece in the battery cell can be improved, and the service life of the battery isprolonged. In addition, the invention also discloses a battery and a battery module structure.

Description

technical field [0001] The invention belongs to the technical field of battery production and manufacturing, and in particular relates to a winding battery core, a battery and a battery module structure. Background technique [0002] Nowadays, all countries are vigorously developing green and high-efficiency secondary batteries. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, and environmental protection. They are widely used in portable appliances, electric tools, large Energy storage, electric transportation power supply and other aspects have broad application prospects. The module composed of batteries is usually used in the chassis of traditional fuel vehicles, and is arranged in specific positions such as the engine and fuel tank of ordinary fuel vehicles to transform fuel vehicles into electric vehicles. [0003] Howev...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M10/0525H01M2/10H01M2/20
CPCH01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 陈圣立让松
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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