CN211404536U

CN211404536U - Novel lithium ion battery shell

Info

Publication number: CN211404536U
Application number: CN202020166916.5U
Authority: CN
Inventors: 袁雪芹; 杨雷
Original assignee: West Anhui University
Current assignee: West Anhui University
Priority date: 2020-02-13
Filing date: 2020-02-13
Publication date: 2020-09-01
Anticipated expiration: 2030-02-13

Abstract

The utility model discloses a novel lithium ion battery shell, including casing main part and several film pressure sensor, the casing main part is the cavity structure who encloses by four lateral walls and end casing, sets up perpendicularly between two adjacent lateral walls, the lateral wall has porose double-walled structure for the side, film pressure sensor arranges with the matrix form and installs in this double-walled structure. The utility model discloses a novel lithium ion battery shell, the lateral wall of casing is foraminiferous double-walled structure, install matrix film pressure sensor between the double-wall, and pressure sensor thickness equals with double-walled clearance width, in case shell surface takes place any deformation, then the double-wall can be exerted pressure simultaneously on pressure sensor, can effectively monitor lithium cell charge-discharge in-process shell surface deformation and the atress condition in the module through this device, and with voltage form output, be convenient for lithium ion battery stress simulation analysis and then judge the safe condition of battery through gathering corresponding parameter.

Description

Novel lithium ion battery shell

Technical Field

The utility model relates to a lithium cell safety technical field especially relates to a novel lithium ion battery shell.

Background

Although the advantages of energy conservation and emission reduction of new energy automobiles are favored by consumers, in recent years, a plurality of new energy automobile products have spontaneous combustion events. According to incomplete statistics, the number of electric automobile fire incidents which occur in 2018 nationwide exceeds 40. Therefore, the safety of the lithium battery cannot be fully ensured only by monitoring safety index parameters such as the voltage and the temperature of the lithium battery through a BMS system, and new performance parameters need to be collected to further enhance monitoring, wherein the pressure change on the surface of the lithium battery shell is an important parameter, and the battery can generate gas and swell or swell hard due to actions such as battery material, battery voltage and temperature abnormity or abnormal impact, and the like, so that the battery fails. Researchers attach the pressure sensor to the outer surface of the lithium battery shell, and when the battery in the module swells and deforms, the danger degree of the lithium battery is analyzed by collecting data through the pressure sensor. However, due to the anisotropic structural design of the square battery, the deformation of the square battery is mainly represented by surface protrusions, and the surface of the whole battery shell is in an arc shape. And inside the module, if battery case and casing both sides do not exert pressure for the sensor simultaneously, then the sensor can't monitor data, leads to the data of gathering incomplete, can't acquire correct information.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide a novel lithium ion battery shell, the casing side is foraminiferous double-walled structure, installs matrix film pressure sensor between the double-walled, can effectively monitor among the module lithium cell charge-discharge in-process casing surface deformation and the atress condition.

The utility model provides a novel lithium ion battery shell, which comprises a shell main body and a plurality of film pressure sensors,

the thin film pressure sensor is characterized in that the shell body is of a cavity structure formed by four side walls and a bottom shell in a surrounding mode, the two adjacent side walls are vertically arranged, the side walls are of a double-wall structure with holes in the side faces, and the thin film pressure sensors are arranged in the double-wall structure in a matrix mode.

Preferably, one or two of the four side walls with the largest cross section are of a double-wall structure.

Preferably, both sides and the top of the double-walled structure are perforated.

Preferably, the thickness of the thin-film pressure sensor is equal to the gap width of the double-wall structure.

The utility model has the advantages that:

the utility model discloses a novel lithium ion battery shell, the lateral wall of casing is foraminiferous double-walled structure, install matrix film pressure sensor between the double-wall, and pressure sensor thickness equals with double-walled clearance width, in case shell surface takes place any deformation, then the double-wall can be exerted pressure simultaneously on pressure sensor, can effectively monitor lithium cell charge-discharge in-process shell surface deformation and the atress condition in the module through this device, and with voltage form output, be convenient for lithium ion battery stress simulation analysis through gathering corresponding parameter, accessible BMS gathers this signal of telecommunication and then monitors the safety threshold value of battery simultaneously.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of the overall structure of a novel lithium ion battery case provided by the present invention;

fig. 2 is a cross-sectional view of the novel lithium ion battery case double-wall structure provided by the present invention.

In the figure: 1. a side wall; 2. an aperture; 3. a thin film pressure sensor.

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.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element 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.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The following further describes a novel lithium ion battery case according to an embodiment of the present invention with reference to the drawings.

Referring to fig. 1-2, a novel lithium ion battery shell, which is suitable for a hard-shell square lithium ion battery, comprises a shell body and a plurality of thin film pressure sensors 3,

the casing main part is the cavity structure that is enclosed by four lateral walls 1 and end casing, sets up perpendicularly between two adjacent lateral walls 1, and lateral wall 1 is the double-walled structure that the side has porose 2, and film pressure sensor 3 arranges in this double-walled structure with the matrix form and installs.

As a preferred embodiment, one or two of the four side walls 1 having the largest cross-section are of a double-wall structure.

Furthermore, two sides and the top of the double-wall structure are provided with holes 2, so that the problems of heat dissipation of the lithium ion battery shell and connection of the sensor connecting wire can be effectively solved.

In addition, in order to improve the detection accuracy of the thin film pressure sensor 3, the thickness of the thin film pressure sensor 3 is equal to the gap width of the double-wall structure, and the thin film pressure sensor 3 adopts an eTouch-FD piezoelectric thin film sensor.

The utility model discloses a novel lithium ion battery shell, in case lithium ion battery double-walled structure takes place any abnormal deformation, double-walled interaction force acts on film pressure sensor 3 simultaneously, through the safe condition of gathering data to lithium ion battery stress simulation analysis and then judging the battery.

Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims

1. A novel lithium ion battery shell is characterized in that: comprises a shell body and a plurality of film pressure sensors,

2. The novel lithium ion battery case of claim 1, wherein: one or two of the four side walls with the largest cross section adopt a double-wall structure.

3. The novel lithium ion battery case according to claim 1 or 2, wherein: two sides and the top of the double-wall structure are provided with holes.

4. The novel lithium ion battery case of claim 1, wherein: the thickness of the thin film pressure sensor is equal to the gap width of the double-walled structure.