CN219017874U

CN219017874U - Lithium battery with expansion protection structure

Info

Publication number: CN219017874U
Application number: CN202223435678.1U
Authority: CN
Inventors: 柯志民; 袁福康; 郭锡民; 李建伦
Original assignee: Zhangzhou Huawei Power Supply Technology Co Ltd
Current assignee: Zhangzhou Huawei Power Supply Technology Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-05-12
Anticipated expiration: 2032-12-21

Abstract

The utility model relates to a lithium battery with an expansion protection structure, which comprises an insulating lithium battery shell, a terminal arranged on the insulating lithium battery shell, a winding core arranged in the insulating lithium battery shell, a conductive silicon tape and a main control PCB (printed circuit board), wherein the winding core is electrically connected with the terminal; one end of the conductive silicon tape is provided with a first conductive electrode, and the other end of the conductive silicon tape is provided with a second conductive electrode; the conductive silicon tape is spirally wound on the periphery of the insulating lithium battery shell; the main control PCB is integrated with a button type battery, a microprocessor, a resistance measuring circuit and a buzzer; the power end of the button battery is electrically connected with the power end of the microprocessor; the first conductive electrode and the second conductive electrode are respectively and electrically connected with the input end of the resistance measurement circuit to form a conductive loop, and the output end of the resistance measurement circuit is electrically connected with the microprocessor; the buzzer is electrically connected with the microprocessor. This lithium cell with inflation protection architecture can whether the intelligent detection lithium cell takes place the inflation.

Description

Lithium battery with expansion protection structure

Technical Field

The utility model relates to the technical field of lithium battery equipment, in particular to a lithium battery with an expansion protection structure.

Background

The general structure of the existing lithium battery is as disclosed in patent application No. CN215988956U of 2021, 08 and 13, and the lithium battery comprises a battery shell, a winding core and a terminal, wherein the winding core is arranged in the battery shell, the winding core comprises a positive plate, a negative plate and a diaphragm, the battery shell is connected with one plate, and the diaphragm is arranged between the positive plate and the negative plate to isolate the positive plate from the negative plate; the terminal with battery case fixed connection, the terminal includes connection piece and utmost point post, the connection piece is connected with another pole piece, the bottom of utmost point post with the connection piece is connected, and the top communicates with the external world, the utmost point post with battery case interval sets up. The common problems of the existing lithium battery in the practical use process are as follows: because heat can be generated in the charge and discharge process, the winding core of the lithium battery expands, the battery shell possibly cracks, and once the battery shell cracks, electrolyte in the winding core contacts with air and moisture, chemical reaction can occur, gas and heat are generated, and the lithium battery deflagration can be seriously caused.

If the expansion phenomenon of the lithium battery can be found early, the lithium battery can be maintained in time, and dangerous accidents (such as deflagration of the lithium battery) can be effectively prevented. At present, all lithium batteries on the market do not have an expansion detection function. Based on the above, the utility model designs a lithium battery with an expansion protection structure.

Disclosure of Invention

Therefore, in view of the above problems, the present utility model provides a lithium battery with an expansion protection structure, which can intelligently detect whether the lithium battery expands.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the lithium battery with the expansion protection structure comprises an insulating lithium battery shell, a terminal arranged on the insulating lithium battery shell and a winding core arranged in the insulating lithium battery shell, wherein the winding core is electrically connected with the terminal;

the device also comprises a conductive silicon tape and a main control PCB board;

one end of the conductive silicon tape is provided with a first conductive electrode, and the other end of the conductive silicon tape is provided with a second conductive electrode;

the conductive silicon tape is spirally wound on the periphery of the insulating lithium battery shell, the first conductive electrode and the second conductive electrode are respectively fixed on the insulating lithium battery shell, and the first conductive electrode is not contacted with the second conductive electrode;

the main control PCB is integrated with a button battery, a microprocessor, a resistance measuring circuit and a buzzer;

the power end of the button battery is electrically connected with the power end of the microprocessor;

the conductive silicon tape is electrically connected with the input end of the resistance measurement circuit through the first conductive electrode and the second conductive electrode to form a conductive loop, and the output end of the resistance measurement circuit is electrically connected with the microprocessor;

the buzzer is electrically connected with the microprocessor.

Furthermore, a prompting lamp is integrated on the main control PCB board; the prompting lamp is electrically connected with the microprocessor.

Further, an electric quantity detection circuit is integrated on the main control PCB; the power end of the button battery is electrically connected with the input end of the electric quantity detection circuit; the output end of the electric quantity detection circuit is electrically connected with the microprocessor.

By adopting the technical scheme, the utility model has the beneficial effects that:

when the lithium battery with the expansion protection structure is used, the conductive silicon tape is spirally wound on the periphery of the insulating lithium battery shell, and the first conductive electrode and the second conductive electrode are respectively fixed on the insulating lithium battery shell. Like this, when insulating lithium battery shell inflation (roll up core inflation and lead to insulating lithium battery shell inflation), make conductive silicon tape is propped by insulating lithium battery shell and becomes longer, and under the unchangeable circumstances of conductive silicon tape volume, conductive silicon tape's sectional area diminishes, consequently conductive silicon tape's resistance grow, detects conductive silicon tape's resistance through the resistance measurement circuit of master control PCB board, and then microprocessor infer conductive silicon tape's the multiple that becomes longer according to conductive silicon tape's resistance, can learn insulating lithium battery shell inflation's multiple. If the expansion multiple of the insulating lithium battery shell exceeds a preset threshold value of the microprocessor, the microprocessor controls the buzzer to give out an alarm sound, and meanwhile the prompting lamp gives out a prompt to remind a user that maintenance should be performed in time.

Drawings

Fig. 1 is a schematic view showing a structure in which a conductive silicon tape is spirally wound around the peripheral side of an insulating lithium battery case in the present utility model.

Fig. 2 is a schematic structural view of the conductive silicon tape according to the present utility model.

Fig. 3 is a block diagram of the circuit connection of the present utility model.

Detailed Description

The utility model will now be further described with reference to the drawings and detailed description.

Referring to fig. 1, 2 and 3, the present embodiment provides a lithium battery with an expansion protection structure, which includes an insulating lithium battery case 1, a terminal 3 disposed on the insulating lithium battery case 1, and a winding core 2 disposed in the insulating lithium battery case 1, wherein the winding core 2 is electrically connected with the terminal 3. The structure of the insulating lithium battery case 1, the winding core 2 and the terminal 3 is an existing lithium battery structure, such as a lithium battery disclosed in chinese patent publication No. CN215988956U (in this embodiment, the shapes of the insulating lithium battery case 1 and the terminal 3 are different from those of the lithium battery disclosed in the patent, but the structural principle is the same, and those skilled in the art should understand the arrangement of the insulating lithium battery case 1, the winding core 2 and the terminal 3, which are not described in detail herein).

The improvement points of the utility model are that:

also comprises a conductive silicon tape 4 and a main control PCB 5.

As shown in fig. 2, the conductive silicon tape 4 has a first conductive electrode 41 disposed at one end and a second conductive electrode 42 disposed at the other end. The first conductive electrode 41 and the second conductive electrode 42 are made of conductive metal, such as aluminum or copper.

The main control PCB 5 is integrated with a microprocessor 51, a button-type battery 52, a resistance measuring circuit 53, an electric quantity detecting circuit 54, a buzzer 55 and a prompting lamp 56.

The resistance measuring circuit 53 is used to detect the resistance of the conductive silicone tape 4 connected between the first conductive electrode 41 and the second conductive electrode 42, and transmit it to the microprocessor 51.

The power detection circuit 54 is configured to detect the power of the button cell 52, and transmit the detected power to the microprocessor 51.

The microprocessor 51, button cell 52, resistance measuring circuit 53, electric quantity detecting circuit 54, buzzer 55, and indicator lamp 56 are all conventional electronic devices. It should be noted that each of the above-mentioned electronic components is an existing device, and those skilled in the art should be provided with conventional connection techniques for electronic components. On the basis of the specification and the drawings, the lithium battery with the expansion protection structure disclosed in the patent application can be completely reproduced through limited circuit connection experiments by a person skilled in the art, and the same technical effects are achieved.

As shown in fig. 1, the conductive silicon tape 4 is spirally wound around the insulating lithium battery can 1, and the first conductive electrode 41 and the second conductive electrode 42 are respectively fixed on the insulating lithium battery can 1, and the first conductive electrode 41 and the second conductive electrode 42 are not in contact.

The power end of the button cell 52 is electrically connected with the power end of the microprocessor 51, and supplies power to the microprocessor 51.

The conductive silicon tape 4 is electrically connected with the input end of the resistance measurement circuit 53 through the first conductive electrode 41 and the second conductive electrode 42 to form a conductive loop, and the output end of the resistance measurement circuit 53 is electrically connected with the microprocessor 51. The resistance measuring circuit 53 detects the resistance of the silicone strip 4 and transmits it to the microprocessor 51.

The power end of the button cell 52 is electrically connected with the input end of the electric quantity detection circuit 54; the output end of the electric quantity detection circuit 54 is electrically connected with the microprocessor 51, and the electric quantity detection circuit 54 transmits the detected electric quantity of the button cell 52 to the microprocessor 51.

The buzzer 55 and the indicator light 56 are respectively electrically connected with the microprocessor 51.

The working principle of the lithium battery with the expansion protection structure is as follows:

when the insulating lithium battery case 1 expands (the core expansion 2 causes the insulating lithium battery case 1 to expand), the conductive silicone tape 4 is made longer by the insulating lithium battery case 1, and the sectional area of the conductive silicone tape 4 becomes smaller with the volume of the conductive silicone tape 4 unchanged, and thus the resistance of the conductive silicone tape 4 becomes larger (r=ρl/S, where R is a resistance value, ρ is a resistivity, L is the length of the conductive silicone tape 4, and S is the sectional area of the conductive silicone tape 4). Therefore, it is possible to detect in advance that the resistance value of the conductive silicon tape 4 when stretched to different lengths is recorded in the microprocessor 51.

When the resistance of the conductive silicon tape 4 is detected by the resistance measuring circuit 53 of the main control PCB 5, the microprocessor 51 deduces the expansion multiple of the conductive silicon tape 4 according to the resistance of the conductive silicon tape 4, so as to obtain the expansion multiple of the insulating lithium battery case 1.

If the expansion multiple of the lithium-ion battery casing 1 exceeds a preset threshold value (for example, the expansion multiple threshold value of the lithium-ion battery casing 1 is 1.15 times) of the microprocessor 51, the microprocessor 51 controls the buzzer 55 to sound an alarm, and the indicator lamp 56 sends out an indication to remind the user that maintenance should be performed timely.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The utility model provides a lithium cell with inflation protection architecture, includes insulating lithium cell shell, sets up terminal on insulating lithium cell shell and sets up the book core in insulating lithium cell shell, book core and terminal electric connection, its characterized in that:

the buzzer is electrically connected with the microprocessor.

2. The lithium battery with an expansion protection structure according to claim 1, wherein: a prompting lamp is integrated on the main control PCB board;

the prompting lamp is electrically connected with the microprocessor.

3. A lithium battery with an expansion protection structure according to claim 1 or 2, characterized in that: the main control PCB is integrated with an electric quantity detection circuit;

the power end of the button battery is electrically connected with the input end of the electric quantity detection circuit;

the output end of the electric quantity detection circuit is electrically connected with the microprocessor.