CN211605334U

CN211605334U - High-safety cylindrical lithium ion battery

Info

Publication number: CN211605334U
Application number: CN201922393970.3U
Authority: CN
Inventors: 席晓飞; 曾庆传; 冯勇; 孟文愿
Original assignee: Huainan Youke New Energy Co ltd
Current assignee: Huainan Youke New Energy Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-09-29
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses a cylindrical lithium ion battery of high safety, including last block, lower block, shell, electric core and heat dissipation layer. The battery cell comprises a diaphragm, a positive electrode, a negative electrode and an insulating base plate; the heat dissipation layer includes a synthetic resin layer and a polyolefin porous layer. The utility model is provided with the heat dissipation layer, which can absorb the internal heat when the lithium ion battery is in a high temperature state, thereby ensuring the safety of the lithium ion battery; the partition type battery cell is adopted, so that the anode and the cathode of the battery can be effectively separated, and explosion caused by short circuit of the lithium ion battery is avoided; simple structure, practicality are strong, with low costs, the production of being convenient for, can wide application in multiple cylindrical battery. The problem of among the prior art diaphragm can not effectively keep apart positive negative pole, and then arouse the short circuit and the explosion of battery and lithium ion battery to be in the same incident that takes place under the high temperature state for a long time is solved.

Description

High-safety cylindrical lithium ion battery

Technical Field

The utility model belongs to the lithium cell field, concretely relates to high safe cylindrical lithium ion battery.

Background

The lithium ion battery consists of an anode, a cathode, a diaphragm and electrolyte, wherein the anode and the cathode are soaked in the electrolyte, and lithium ions move between the anode and the cathode by taking the electrolyte as a medium, so that the charging and discharging of the battery are realized. In practical application, in order to avoid short circuit between the positive electrode and the negative electrode through the electrolyte, the positive electrode and the negative electrode need to be separated by a diaphragm.

In actual production, battery manufacturers use thinner separators to store more electrical energy in a limited volume in order to increase the energy density of the battery. But the reduction of the thickness increases the production difficulty of the diaphragm, and easily causes quality defects, so that the diaphragm can not effectively isolate the positive electrode and the negative electrode, and further causes the short circuit and explosion of the battery. Secondly, the lithium ion battery can generate heat in the charging and discharging process, and safety accidents happen when the lithium ion battery is in a high-temperature state for a long time.

In view of the above circumstances, a high-safety cylindrical lithium ion battery is designed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide a cylindrical lithium ion battery with high safety, which solves the problems of prior art that the diaphragm can not effectively isolate the positive and negative poles, and the short circuit and explosion of the battery and the lithium ion battery are in the high temperature state for a long time, and the safety accident also occurs.

The purpose of the utility model can be realized by the following technical scheme:

the utility model provides a cylindrical lithium ion battery of high safety, includes electric core and heat dissipation layer, electric core includes diaphragm, positive pole, negative pole and insulating backing plate.

The heat dissipation layer comprises a synthetic resin layer and a polyolefin porous layer, wherein the synthetic resin layer is arranged in the polyolefin porous layer.

The high-safety cylindrical lithium ion battery comprises an upper cover cap and a lower cover cap, wherein a shell is arranged between the upper cover cap and the lower cover cap, a battery cell and a heat dissipation layer are arranged in the shell, and the heat dissipation layer is arranged in the battery cell.

The diaphragm is arranged between the anode and the cathode and stacked alternately, and the insulating base plates are arranged at two ends of the diaphragm, the anode and the cathode.

The utility model has the advantages that:

1. the utility model is provided with the heat dissipation layer, which can absorb the internal heat when the lithium ion battery is in a high temperature state, thereby ensuring the safety of the lithium ion battery;

2. the utility model adopts the partition type battery cell, which can effectively partition the anode and cathode of the battery, and avoid explosion caused by short circuit of the lithium ion battery;

3. the utility model discloses simple structure, practicality are strong, with low costs, the production of being convenient for, can wide application in multiple cylindrical battery.

Drawings

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

Fig. 1 is an exploded view of the overall structure of an embodiment of the present invention;

fig. 2 is a schematic diagram of a cell structure according to an embodiment of the present invention;

fig. 3 is a schematic view of a heat dissipation layer structure according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", and the like, indicate positional or positional relationships, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

As shown in fig. 1, a high-safety cylindrical lithium ion battery includes an upper cap 1 and a lower cap 5, a casing 2 is disposed between the upper cap 1 and the lower cap 5, a battery core 3 and a heat dissipation layer 4 are disposed in the casing 2, and the heat dissipation layer 4 is disposed in the battery core 3.

As shown in fig. 2, the battery cell 3 includes a separator 31, a positive electrode 33, a negative electrode 32, and an insulating pad 34, the separator 31 is disposed between the positive electrode 33 and the negative electrode 32, and the three are stacked alternately, and the insulating pad 34 is disposed at two ends of the separator 31, the positive electrode 33, and the negative electrode 32, in real life, for a cylindrical lithium ion battery, the separator 31 needs to be disposed between the positive electrode 33 and the negative electrode 32 to separate the positive electrode 33 and the negative electrode 32, so that short circuit does not occur and explosion is not caused, but because the two ends of the positive electrode 33 and the negative electrode 32 are not completely separated by the separator 31, and a battery manufacturer uses a thinner separator 31 in order to increase the energy density of the battery, so as to store more electric energy in a. Therefore, when the cylindrical lithium ion battery is used for a long time or the internal temperature is too high, the positive electrode 33 and the negative electrode 32 cannot be separated by the thin separator 31. Therefore, according to the design, the insulating base plates 34 are arranged at the two ends of the diaphragm 31, the anode 33 and the cathode 32, so that the anode 33 and the cathode 32 are in an isolated state under any condition, and the anode 33 and the cathode 32 in the lithium ion battery can be buffered when being impacted by external force.

As shown in fig. 3, the heat dissipation layer 4 includes a synthetic resin layer 42 and a polyolefin porous layer 41, and the synthetic resin layer 42 is disposed in the polyolefin porous layer 41. In the process of charging and discharging the lithium ion battery, the internal temperature of the lithium ion battery can rise, and if the heat dissipation is not timely, the internal temperature of the lithium ion battery is too high, so that the voltage difference between a positive electrode and a negative electrode is unstable, the voltage output of the lithium ion battery is influenced, and the lithium ion battery can explode when the voltage is serious. The polyolefin porous layer 41 is of a porous structure, and heat can be dissipated along the pores when the lithium ion battery heats, so that the heat dissipation effect is achieved; meanwhile, the polyolefin porous layer 41 serving as a heat dissipation filler can increase the specific heat capacity of the diaphragm 31, so that the diaphragm 31 is not easily damaged when being heated. The synthetic resin layer 42 can further absorb heat that the polyolefin porous layer 41 cannot absorb and allow the battery to play a role of buffering when being pressed by an external force.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A high-safety cylindrical lithium ion battery comprises a battery cell (3) and a heat dissipation layer (4), and is characterized in that the battery cell (3) comprises a diaphragm (31), a positive electrode (33), a negative electrode (32) and an insulating base plate (34);

the heat dissipation layer (4) includes a synthetic resin layer (42) and a polyolefin olefin porous layer (41), and the synthetic resin layer (42) is disposed in the polyolefin olefin porous layer (41).

2. The high-safety cylindrical lithium ion battery according to claim 1, comprising an upper cap (1) and a lower cap (5), wherein a casing (2) is arranged between the upper cap (1) and the lower cap (5), a battery cell (3) and a heat dissipation layer (4) are arranged in the casing (2), and the heat dissipation layer (4) is arranged in the battery cell (3).

3. The cylindrical lithium ion battery with high safety as claimed in claim 1, wherein the separator (31) is disposed between the positive electrode (33) and the negative electrode (32) and stacked alternately, and the insulating pad (34) is disposed at two ends of the separator (31), the positive electrode (33) and the negative electrode (32).