Metal shell button type lithium ion battery

Abstract

The invention relates to the field of lithium batteries, and discloses a metal shell button type lithium ion battery. The battery comprises a metal shell, a battery cell which is arranged in the metalshell, a terminal arranged on the outer side of the metal shell, and an insulating part arranged between the metal shell and the terminal and is insulated and sealed with the metal shell and the terminal respectively; at least one first tab which is electrically connected with the metal shell and has positive polarity or negative polarity is arranged on the battery cell; the battery cell is alsoprovided with at least one second tab which is electrically connected with the terminal and has negative polarity or positive polarity; the metal shell and the terminal are connected with the insulating part in a heat sealing or bonding manner; the metal shell serves as one pole, and the terminal serves as the other pole; the occupied space of the battery structure is small in the axial directionand the radial direction of the battery cell, the energy density of the battery is improved, and the lithium ion battery has the advantages of being simple in structure, high in sealing reliability and high in energy density and meets the efficient production requirement.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a metal shell button lithium ion battery. Background technique [0002] At present, when most battery manufacturers make thin metal shell lithium secondary batteries, the outer shell of the battery cell adopts a circular metal shell, and its structure is divided into three layers: an inner shell, an outer shell, and a sealing ring. Therefore, in the prior art Lithium-ion batteries occupy a lot of space in the radial direction, resulting in that the battery product cannot make full use of the space in the radial direction, so there is a technical problem of low energy density of the battery. The seal between the inner shell and the outer shell adopts an R angle Sealing technology, which relies on compressed plastic sealing rings to achieve sealing. However, the existing technical means are not very accurate in measuring the R angle, so the good sealing between the inner shell and...

AI Technical Summary

Problems solved by technology

[0002] At present, when most battery manufacturers make thin metal shell lithium secondary batteries, the outer shell of the battery cell adopts a circular metal shell, and its structure is divided into three layers: an inner shell, an outer shell, and a sealing ring. Therefore, in the prior art Lithium-ion batteries occupy a lot of space in the radial direction, resulting in that the battery product cannot make full use of the space in the radial direction, so there is a technical problem of low energy density of the battery. The seal between the inner shell and the outer shell adopts an R angle Sealing technology, which relies on compressed plastic sealing rings to achieve sealing

However, the existing technical means are not very accurate in measuring the R angle, so the good sealing between the inner shell and the outer shell cannot be fully guaranteed, and there are technical problems of low product reliability and low pass rate

In addition, the inner shell and the outer shell of the steel shell are used as the positive and negative electrodes respectively, and the battery product is prone to short circuit problems.

[0003] In order to improve the above technical problems, a new structure has also been developed in recent years, that is, a similar structure to the current power aluminum case battery is adopted, such as figure 1 Shown is a battery product in the prior art, which uses a single-layer metal casing 83 as the negative electrode, and an aluminum cap 81 of another polarity is arranged on one side of the metal casing 83, and the insulation treatment method between the metal casing 83 and the aluminum cap 81 is as follows: The riveted structure, the biggest shortcoming of the riveted structure is that there are five layers of structure on the axial side of the battery core: aluminum cap 81, first insulating layer 82, metal shell 83, second insulating layer 84 and rivets 85, the five layers The structure occupies too much space, usually more than 1mm, so the battery product cannot make full use of the axial space, and there is a technical problem of low energy density of the battery

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