CN217214892U

CN217214892U - Long-life lithium ion battery

Info

Publication number: CN217214892U
Application number: CN202121921826.3U
Authority: CN
Inventors: 杜博炎
Original assignee: Sichuan Lingpai New Energy Technology Co ltd; Suzhou Lingpai New Energy Technology Co ltd; Hunan Lingpai New Energy Technology Co Ltd
Current assignee: Hunan Lingpai Energy Storage Technology Co ltd; Hunan Lingpai New Energy Research Institute Co ltd; Hunan Lingpai New Energy Technology Co Ltd; Hengyang Lingpai New Energy Technology Co Ltd; Hunan Lead Power Dazhi Technology Inc
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2022-08-16
Anticipated expiration: 2031-08-17

Abstract

The utility model belongs to the technical field of lithium ion battery, concretely relates to high life lithium ion battery. The method comprises the following steps: the electrolyte cell comprises a cell, a filling space for generating electrolyte, an insulating film, a shell and a sealing cover, wherein the insulating film is sleeved on the outer surface of the cell; and the cover plate is fixed on the shell and forms a sealed space for the battery cell and the insulating film together with the shell. The utility model discloses utilize capillary effect, can be when electrolyte loss, carry the electrolyte of electricity core bottom to electricity core middle part or top, can avoid lithium ion battery to appear "dead zone" effect, avoided the defect that the large capacity charge-discharge process heat release that "dead zone" effect leads to increases, avoided the battery thermal runaway, prolonged lithium ion battery's life simultaneously; and simultaneously, the utility model has the advantages of simple structure and improve with low costsly.

Description

Long-life lithium ion battery

Technical Field

The utility model belongs to the technical field of lithium ion battery, concretely relates to high life lithium ion battery.

Background

The manufacturing process of the lithium ion battery comprises the steps of setting the structural member, adding electrolyte into the battery cell, sealing the battery cell, and carrying out charge and discharge tests to normally use the battery. Along with the accumulative use of battery, the battery capacity can take place the sudden drop condition, discovers after disassembling the battery that there is the obvious "dead zone" condition in the first half of electricity core, and the reason of "dead zone" leads to the electrolyte loss for many times charge-discharge, lacks the electrolyte because of "dead zone" and carries out effective ion conduction, and takes place regional inefficacy, and then leads to the battery capacity to drop suddenly. After the dead zone of the battery occurs, the heat release quantity of the battery is increased sharply compared with the normal battery when the battery is charged and discharged by heavy current, and the hidden danger of thermal runaway exists.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a long-life lithium ion battery, utilize the capillary effect, can transport the electrolyte of electricity core bottom to electricity core middle part or top when the electrolyte is lost, can avoid lithium ion battery to appear "dead zone" effect, avoided the defect that the large capacity charge-discharge process heat release that "dead zone" effect leads to increases, avoided the battery thermal runaway, prolonged lithium ion battery's life simultaneously; and simultaneously, the utility model has the advantages of simple structure and improve with low costs.

In order to achieve the technical effects, the utility model discloses the concrete technical scheme who adopts is:

a long-life lithium-ion battery comprising:

cell core, filling space for generating electrolyte

The insulating film is sleeved on the outer surface of the battery core, and the contact surface of the insulating film and the battery core is configured to enable the electrolyte to generate a capillary phenomenon of antigravity;

the shell is sleeved on the outer surface of the insulating film;

and the cover plate is fixed on the shell and forms a sealed space for the battery cell and the insulating film together with the shell.

Further, the insulating film includes an insulating portion and a plurality of capillaries attached to the insulating portion.

Furthermore, the aperture of the capillary is 1-100 microns.

Further, the extending directions of the capillaries are not all the same.

Further, the insulating film is an insulating porous film.

Furthermore, the aperture of the porous film is 1-100 microns.

Furthermore, the thickness of the insulating porous film is 0.1-2 mm.

Further, the lithium ion battery also comprises a capillary body; the capillary body is arranged in the battery cell and is used for forming a capillary phenomenon of the electrolyte in the antigravity direction in the battery cell.

Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect can be brought:

by utilizing the capillary effect, the electrolyte at the bottom of the battery core can be conveyed to the middle part or the top part of the battery core when the electrolyte is consumed, so that the phenomenon of dead zone of the lithium ion battery can be avoided, the defect of increased heat release in the large-capacity charging and discharging process caused by the dead zone effect is avoided, the thermal runaway of the battery is avoided, and the service life of the lithium ion battery is prolonged; and simultaneously, the utility model has the advantages of simple structure and improve with low costsly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a cross-sectional view of a long-life lithium ion battery according to an embodiment of the present invention;

wherein: 1. an electric core; 2. an insulating film; 3. a housing; 4. and (7) a cover plate.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The present invention can be implemented or applied by other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to or other than one or more of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation can be changed at will, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.

The disassembly observation shows that the electrolyte liquid state residue still exists at the bottom of the lithium ion battery with the sharply reduced electric capacity, namely the electrolyte is lacked in the upper area inside the battery, and the electrolyte is remained at the bottom.

The structure of a conventional lithium ion battery main body is as follows from inside to outside: the battery comprises a battery core 1, an insulating film 2 wrapped outside the battery core 1, a shell 3 wrapped outside the insulating film 2 and a cover plate 4 buckled on the shell 3.

In this embodiment, a long-life lithium ion battery is provided, as shown in fig. 1, including:

cell 1, a filling space for generating electrolyte

The insulating film 2 is sleeved on the outer surface of the battery cell 1, and the contact surface of the insulating film 2 and the battery cell 1 is configured to enable the electrolyte to generate a capillary phenomenon of antigravity;

a housing 3 fitted around the outer surface of the insulating film 2;

and the cover plate 4 is fixed on the shell 3 and forms a sealed space for the battery cell 1 and the insulating film 2 together with the shell 3.

The insulating film 2 includes an insulating portion and a plurality of capillaries attached to the insulating portion.

In the embodiment, in order to realize the capillary transportation of the electrolyte, the aperture of the capillary is 1-100 microns.

In this embodiment, the extending directions of the capillaries are not all the same.

In this embodiment, for this insulating film 2 increases the capillary that the one deck laminating set up, electrolyte is remained to the bottom of battery in the use, can rise to electric core 1 in, upper portion via the capillary, replenishes for the electrolyte that electric core 1 in, upper portion consumed, can postpone the time that "dead zone" appears in the battery, and then extension battery life.

In one embodiment, in order to further improve the antigravity capillary efficiency, the lithium ion battery of the embodiment is further provided with a capillary body; the capillary body is arranged in the battery cell 1 and is used for forming a capillary phenomenon of the electrolyte in the antigravity direction in the battery cell 1.

In the present embodiment, the insulating film 2 is an insulating porous film. The material is insulating plastic capable of resisting electrolyte corrosion.

In this embodiment, the thickness of the insulating porous film is 0.1-2 mm, which is slightly larger than the thickness of the original insulating film 2.

In this embodiment, the original insulating film 2 is replaced with an insulating porous film, and the counter-gravity transport of the electrolyte by capillary action can be realized while maintaining the original function of the original insulating film 2.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A long-life lithium ion battery, comprising:

the battery cell is used for generating a filling space of the electrolyte;

the shell is sleeved on the outer surface of the insulating film;

the cover plate is fixed on the shell and forms a sealed space for the battery cell and the insulating film together with the shell;

the insulating film includes an insulating portion and a plurality of capillaries attached to the insulating portion.

2. The lithium ion battery of claim 1, wherein the pore size of the capillary is 1-100 microns.

3. The lithium ion battery of claim 1, wherein the direction of extension of each of the capillaries is not all the same.

4. The lithium ion battery of claim 1, wherein the insulating film is an insulating porous film.

5. The lithium ion battery according to claim 4, wherein the porous film has a pore size of 1 to 100 μm.

6. The lithium ion battery according to claim 4, wherein the thickness of the insulating porous film is 0.1-2 mm.

7. The lithium ion battery of claim 1, further comprising a capillary body; the capillary body is arranged inside the battery cell and is used for forming a capillary phenomenon of the electrolyte in the antigravity direction inside the battery cell.