CN216980671U

CN216980671U - Battery top cover structure

Info

Publication number: CN216980671U
Application number: CN202123302633.2U
Authority: CN
Inventors: 宋维力; 陈浩森; 孙磊; 陈紫升; 崔如瑶
Original assignee: Beijing Institute of Technology BIT
Current assignee: Beijing Institute of Technology BIT
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-07-15
Anticipated expiration: 2031-12-24

Abstract

The utility model discloses a battery top cover structure, comprising: a pressure relief valve plate; and the strain gauge is adhered to the surface of the pressure relief valve plate, wherein the internal air pressure of the battery is determined according to a strain signal generated by the strain gauge. The problems that the battery structure is damaged and the sensor cannot be implanted due to the narrow internal space of the battery are solved.

Description

Battery top cover structure

Technical Field

The utility model relates to the technical field of battery top covers, in particular to a battery top cover structure.

Background

In the related art, when the internal air pressure is measured by a traditional battery, the internal air pressure can be measured by punching a hole in a top cover and placing an air pressure sensor, or the air pressure sensor is implanted into the battery to measure the internal air pressure, and when the internal air pressure is measured by punching a hole in the top cover and placing the air pressure sensor, the structure of the battery can be damaged; when the baroceptor is implanted inside the battery, the baroceptor is difficult to implant due to the narrow space inside the battery, and therefore how to better realize measuring the internal air pressure of the battery becomes a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve at least one of the technical problems of the related art to some extent.

Therefore, the utility model aims to provide a battery top cover structure.

In order to achieve the above object, a battery top cover structure according to an embodiment of the present invention includes:

a pressure relief valve plate;

and the strain gauge is adhered to the surface of the pressure relief valve plate, and the air pressure in the battery is determined according to a strain signal generated by the strain gauge.

According to the battery top cover structure provided by the embodiment of the utility model, the strain gauge is adhered to the surface of the pressure relief valve plate, so that the internal air pressure of the battery is determined according to a strain signal generated by the strain gauge. The problems that the battery structure is damaged and the sensor cannot be implanted due to the narrow internal space of the battery are solved.

In addition, the battery top cover structure provided by the utility model also has the following additional technical characteristics:

in an embodiment of the present invention, the manner of adhering the strain gauge to the surface of the relief valve plate includes: affixing the outer surface and/or affixing the inner surface.

In an embodiment of the present invention, the determining the internal gas pressure of the battery according to the strain signal generated by the strain gauge includes: when the value of the strain number generated by the strain gauge is 0-300 microstrain, the internal air pressure range of the battery is 0.7-1.5 MPa.

In one embodiment of the utility model, the battery comprises an internal circuit, and the strain gauge is adhered to the inner surface of the pressure relief valve plate, so that the pressure relief valve plate is connected with the internal circuit of the battery, and internal data of the battery is transmitted.

In one embodiment of the utility model, the positive electrode and the negative electrode of the battery are used as the special-shaped antenna, and the internal data of the battery is transmitted to the outside of the battery.

In one embodiment of the utility model, the strain gage thickness is 0.060 mm.

In one embodiment of the utility model, the strain gauge is adhered to the inner surface of the pressure relief valve sheet, and the substrate and the covering layer of the strain gauge are made of PI polyimide materials.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,

fig. 1 is a schematic structural view of a battery top cover structure according to an embodiment of the present invention.

Reference numerals:

1. a top cover; 2. a pressure relief valve plate; 3. a strain gauge.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, 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 functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

An embodiment of the present invention is described below with reference to fig. 1.

As shown in fig. 1, a battery top cap 1 structure according to an embodiment of the present invention includes: a pressure relief valve plate 2; and the strain gauge 3 is adhered to the surface of the pressure relief valve plate 2, wherein the internal air pressure of the battery is determined according to a strain signal generated by the strain gauge 3.

That is, the strain gauge 3 is adhered to the surface of the pressure relief valve plate 2, so that the internal air pressure of the battery is determined according to a strain signal generated by the strain gauge.

In the embodiment of the present invention, the way of adhering the strain gauge 3 to the surface of the pressure relief valve plate 2 includes: an adhesive outer surface and/or an adhesive inner surface.

When the strain gauge 3 is adhered to the outer surface of the pressure relief valve plate 2, as an embodiment, the deformation of the pressure relief valve plate 2 can be determined according to the change of the internal air pressure of the battery, then the strain signal generated by the strain gauge 3 can be determined according to the deformation of the pressure relief valve plate 2, and the internal air pressure of the battery can be determined according to the strain signal generated by the strain gauge 3.

It can be understood that when the internal air pressure of the battery changes, whether the pressure relief valve plate 2 deforms or not can be determined, and then the strain signal of the strain gauge 3 on the outer surface of the pressure relief valve plate 2 can be further determined, wherein the amplitude of the strain signal is in positive correlation with the internal air pressure of the battery, so that the internal air pressure value of the battery can be determined according to the strain signal generated by the strain gauge 3.

Wherein, when the strain number value generated by the strain gauge is 0 to 300 microstrain, the air pressure range inside the battery is 0.7 to 1.5 MPa.

It should be noted that, the strain signal that foil gage 3 produced can regard as the characteristic signal of pressure release valve block 2 opening pressure, and when the strain signal appears unusually, set up the threshold value of pressure according to statistics law, carry out the timely early warning of thermal runaway, and then realized the effect of realizing the effective early warning of battery thermal runaway through monitoring the strain signal.

When the strain gauge 3 is adhered to the inner surface of the pressure relief valve plate 2, as an embodiment, the battery comprises an internal circuit, and the strain gauge 3 is adhered to the inner surface of the pressure relief valve plate 2, so that the pressure relief valve plate 2 can be connected with the internal circuit of the battery, and internal data of the battery can be transmitted.

The positive electrode and the negative electrode of the battery are used as the special-shaped antenna, and the data in the battery are transmitted to the outside of the battery.

Wherein the thickness of the strain gauge 3 is 0.060 mm.

The strain gauge 3 is adhered to the inner surface of the pressure relief valve plate 2, the substrate and the covering layer of the strain gauge 3 are made of plastic materials, the plastic materials can be PI polyimide materials, and the PI polyimide materials are made of a heat sealing process, so that the sensitive grid can be effectively wrapped, and the corrosion of battery electrolyte is prevented.

The polyimide material is an aromatic heterocyclic polymer compound having a molecular structure containing imide group links, and is one of the most heat-resistant varieties in engineering plastics at present. The main chain bond has large energy, is not easy to break and decompose, resists high temperature and low temperature and has low thermal expansion coefficient. But also has high strength and modulus, high fracture toughness and excellent dimensional stability; the PI resin can keep higher strength at high temperature, the bending strength of the PI resin at 200 ℃ reaches about 24MPa, and the bending strength and the compressive strength of the PI resin at 250 ℃ still reach 12-13 MPa; the PI resin has higher rigidity, better dimensional stability and smaller coefficient of linear expansion, and is very close to a metal aluminum material; the composite material has excellent chemical resistance, corrosion resistance similar to that of nickel steel, flame retardance, less smoke and toxic gas released in flame and high radiation resistance. The method is widely applied to the fields of aviation, aerospace, microelectronics, nano, liquid crystal, separation membranes, laser and the like.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means 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 utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

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 to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery top cap structure, comprising:

a pressure relief valve plate;

2. The battery top cover structure of claim 1, wherein the strain gauge is adhered to the surface of the relief valve plate in a manner comprising: affixing the outer surface and/or affixing the inner surface.

3. The battery top cover structure of claim 1, wherein said determining the gas pressure inside the battery based on the strain signal generated by said strain gauge comprises: when the value of the strain number generated by the strain gauge is 0-300 microstrain, the internal air pressure range of the battery is 0.7-1.5 MPa.

4. The battery top cover structure of claim 2, wherein the battery comprises an internal circuit, and the strain gauge is adhered to the inner surface of the pressure relief valve plate, so that the pressure relief valve plate is connected with the internal circuit of the battery to transmit the internal data of the battery.

5. The battery top cover structure of claim 4, wherein the internal data of the battery is transmitted to the outside of the battery by using the positive and negative electrodes of the battery as the special-shaped antennas.

6. The battery cap structure of claim 4, wherein the strain gage thickness is 0.060 mm.

7. The battery top cap structure of claim 2, wherein the strain gauge is adhered to the inner surface of the pressure relief valve sheet, and the base and cover layers of the strain gauge are made of a plastic material.