CN212542514U

CN212542514U - Lithium ion battery with double winding core series structure

Info

Publication number: CN212542514U
Application number: CN202021580725.XU
Authority: CN
Inventors: 焦坤; 郑军欣; 其他发明人请求不公开姓名
Original assignee: Huizhou Heteng Energy Technology Co ltd
Current assignee: Huizhou Heteng Energy Technology Co ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2021-02-12
Anticipated expiration: 2030-08-03

Abstract

The utility model discloses a lithium ion battery with a double-winding core series structure, which comprises a first winding core and a second winding core, wherein the first winding core and the second winding core are overlapped, the first winding core is provided with a first positive lug and a first negative lug which are protruded outwards, the first positive lug is arranged on one side of the first winding core, and the first negative lug is arranged in the middle of the first winding core; the second winding core is provided with a second positive tab and a second negative tab which protrude outwards, the second positive tab is arranged in the middle of the second winding core, and the second negative tab is arranged on one side of the second winding core; the first negative electrode lug is welded with the second positive electrode lug, and the first positive electrode lug and the second negative electrode lug are symmetrically arranged in a staggered mode. The utility model discloses a first negative pole ear of first book core welds with the second anodal ear of the core is rolled up to the second, realizes that first book core and second roll up the series connection of core to this improves lithium ion battery's operating voltage, and improves lithium ion battery's volume energy density, reduces production processes, reduce cost.

Description

Lithium ion battery with double winding core series structure

Technical Field

The utility model relates to a lithium ion battery field, in particular to two core series connection structure lithium ion battery of rolling up.

Background

In daily life, some products need lithium ion batteries with higher rated working voltage, however, the rated working voltage of the existing single lithium ion battery is only 3.7V and can not meet the market demand, so that two or more lithium ion batteries need to be combined in series to achieve the higher rated working voltage.

In the existing method, two lithium ion batteries with a voltage of 3.7V are attached together, then a layer of fireproof cotton is padded in the middle of the two lithium ion batteries, and the anode of one lithium ion battery is connected with the cathode of the other lithium ion battery, so that the working voltage of the lithium ion batteries is improved after series connection combination, but the volume energy density of the lithium ion batteries is lower after series connection, the working procedures in the production process are increased, and the cost is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two core series connection structure lithium ion battery that roll up that promote volume energy density, practice thrift the cost.

For solving the above technical problem, the utility model discloses can adopt following technical scheme to realize:

a lithium ion battery with a double winding core series connection structure comprises a first winding core and a second winding core, wherein the first winding core and the second winding core are arranged in a superposed mode, the first winding core is provided with a first positive lug and a first negative lug which protrude outwards, the first positive lug is arranged on one side of the first winding core, and the first negative lug is arranged in the middle of the first winding core;

the second winding core is provided with a second positive tab and a second negative tab which protrude outwards, the second positive tab is arranged in the middle of the second winding core, and the second negative tab is arranged on one side of the second winding core;

the first negative electrode lug is welded with the second positive electrode lug, and the first positive electrode lug and the second negative electrode lug are symmetrically arranged in a staggered mode.

In one embodiment, tab glue is arranged on each of the first positive tab and the second negative tab.

In one embodiment, the welding position of the first negative tab and the second positive tab is further coated with an insulating glue.

In one embodiment, the first winding core and the second winding core are square.

The utility model has the advantages that: the utility model discloses two book core series structure lithium ion battery, the first negative pole ear that will first roll up the core sets up at the middle part, the same second positive ear that rolls up the core with the second sets up at the middle part, roll up first core and the second and roll up the core and superpose, and weld first negative pole ear and the positive ear of second, all be in the middle part position because of first negative pole ear and the positive ear of second, can make it convenient when the welding, in addition, the first positive ear that rolls up the core and the second negative pole ear symmetry dislocation set that the core was rolled up to the second, therefore, can not form the interference each other, finally, realize two lithium ion battery who rolls up core series structure, improve lithium ion battery's volume energy density, and reduce production process, and the cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a first winding core and a second winding core of a lithium ion battery with a double-winding core series structure according to the present invention;

fig. 2 is the utility model discloses two roll up first book cores of core and the second book core series connection schematic diagram of roll up series structure lithium ion battery.

As shown in the attached drawings: 100. a first winding core; 110. a first positive tab; 120. a first negative electrode tab; 200. a second winding core; 210. a second positive tab; 220. a second negative tab; 300. and (5) gluing the tab.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and fig. 2, a lithium ion battery with a double winding core series structure includes a first winding core 100 and a second winding core 200, wherein the first winding core 100 and the second winding core 200 are stacked, the first winding core 100 is provided with a first positive tab 110 and a first negative tab 120 protruding outward, the first positive tab 110 is arranged on one side of the first winding core 100, and the first negative tab 120 is arranged in the middle of the first winding core 100; the second winding core 200 is provided with a second positive tab 210 and a second negative tab 220 which protrude outwards, the second positive tab 210 is arranged in the middle of the second winding core 200, and the second negative tab 220 is arranged on one side of the second winding core 200; the first negative tab 120 is welded to the second positive tab 210, and the first positive tab 110 and the second negative tab 220 are symmetrically arranged in a staggered manner. The first winding core 100 and the second winding core 200 are both winding cores with square structures.

In order to increase the operating voltage of the lithium ion battery, two square winding cores are adopted in this embodiment, and the first winding core 100 and the second winding core 200 are stacked and connected in series. Specifically, a first positive tab 110 and a first negative tab 120 are disposed on a first winding core 100, one end of the first positive tab 110 and one end of the first negative tab 120 are disposed inside the first winding core 100, the other end of the first positive tab 110 protrude from the first winding core 100, the first positive tab 110 is disposed on the right side of the first winding core 100, the first negative tab 120 is disposed in the middle of the first winding core 100, a second positive tab 210 and a second negative tab 220 are disposed on a second winding core 200, one end of the second positive tab 210 and one end of the second negative tab 220 are disposed inside the second winding core 200, the other end of the second positive tab 120 and the other end of the second negative tab 220 protrude from the second winding core 200, the second positive tab 210 is disposed in the middle of the second winding core 200, and the second negative tab 220 is disposed on the left side of the second winding core 200, so that when the first winding core 100 and the second winding core 200 are connected in series, the first negative tab 120 and the second tab 210 are conveniently welded, and the first positive tab 110 and the second tab 210 are disposed on the two sides, interference can not be formed, the structure of the lithium ion battery is reasonable, the volume energy density of the lithium ion battery is improved through the series connection of the lithium ion battery, the processing procedures can be reduced in the production process, and the production and manufacturing cost is reduced by 15%.

In addition, referring to fig. 1 or fig. 2, tab glue 300 is disposed on both the first positive tab 110 and the second negative tab 220.

In this embodiment, after first book core 100 and second roll core 200 establish ties, need wrap up first book core 100 and second roll core 200 through the packaging film and pack sealedly, and it is better in order to make sealed effect, consequently all set up utmost point ear glue 300 on first anodal ear 110 and second negative pole ear 220, can make better laminating between first anodal ear 110 and second negative pole ear 220 and the packaging film through utmost point ear glue 300, make sealed effect better to this improves lithium ion battery's quality.

In order to improve the safety of the lithium ion battery, after the first negative tab 120 protruding from the first winding core 100 and the second positive tab 210 protruding from the second winding core 200 are welded and connected in series, the welded first negative tab 120 and the welded second positive tab 210 are coated with an insulating adhesive (not shown), so that the safety of the lithium ion battery is improved through the insulating adhesive, and the short circuit phenomenon is prevented.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. The present invention can be smoothly implemented by those skilled in the art according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations can be made without departing from the scope of the present invention, which is equivalent to the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a two core series connection structure lithium ion battery that roll up, includes that first roll core and second roll core, first roll core and second roll core stack setting, its characterized in that:

the first winding core is provided with a first positive tab and a first negative tab which protrude outwards, the first positive tab is arranged on one side of the first winding core, and the first negative tab is arranged in the middle of the first winding core;

2. The lithium ion battery with the double-winding-core series structure according to claim 1, wherein: and the first positive tab and the second negative tab are respectively provided with tab glue.

3. The lithium ion battery with the double-winding-core series structure according to claim 2, wherein: and the welding part of the first negative electrode lug and the second positive electrode lug is also coated with insulating glue.

4. The lithium ion battery with the double-winding-core series structure according to claim 3, wherein: the first roll core and the second roll core are square.