CN217465897U

CN217465897U - Lithium cell internal pressure testing arrangement

Info

Publication number: CN217465897U
Application number: CN202221241082.5U
Authority: CN
Inventors: 钟祥龙; 矫贺东
Original assignee: Chuneng New Energy Co Ltd
Current assignee: Chuneng New Energy Co Ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2022-09-20
Anticipated expiration: 2032-05-23

Abstract

The utility model provides a lithium cell internal pressure testing arrangement is the clear glass pipe of "U" shape structure through the setting, can prevent that gas from passing liquid escape to prevent to detect inefficacy, the utility model discloses can judge fast that battery is inside negative pressure state or malleation state, also can calculate the pressure differential of battery internal pressure and atmospheric pressure, simultaneously, the device simple easy manufacturing of structure, low cost, convenient operation possesses the large tracts of land and promotes use value.

Description

Lithium cell internal pressure testing arrangement

Technical Field

The utility model relates to a lithium ion battery field especially relates to a lithium cell internal pressure testing arrangement.

Background

Lithium ion batteries have many advantages such as high voltage, high specific capacity, environmental friendliness, and many cycle times, and are therefore widely used in the fields of portable electronic devices and electric vehicles. However, the lithium ion battery generally has a problem of high temperature gassing, and therefore, in a laboratory test link, the internal pressure of the lithium ion battery is often required to be detected.

At present, the internal pressure of the lithium battery has no simple, convenient and quick testing device. Patent CN101281984A discloses a method and device for detecting internal pressure of a lithium ion battery, which comprises drilling a hole at the bottom of the battery, discharging the gas in the battery into the liquid with a graduated burette under atmospheric pressure through a sealed gas channel, and reading and recording the height difference of the liquid level before and after the burette is filled with the gas, thereby calculating the internal pressure of the battery. However, as can be seen from the description of figure 1, the burette is of a straight cylindrical shape and if gas is introduced directly from the bottom, it may pass through the intermediate liquid level and exit through the valve at the top, causing a detection failure. Therefore, it is necessary to improve the above technical problems.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a lithium cell internal pressure testing arrangement can accurate detection battery internal pressure, and prevents to become invalid.

The technical scheme of the utility model is realized like this: the utility model provides a lithium battery internal pressure testing device, which comprises a hollow needle head, a first hose and a transparent glass tube, wherein,

the first hose is communicated with the hollow needle head;

the transparent glass tube comprises a first tube section, a second tube section and a third tube section which are sequentially communicated, wherein,

the second pipe section is horizontally arranged;

the first pipe section is vertically arranged, an opening at the top of the first pipe section is communicated with the first hose, and an opening at the bottom of the first pipe section is communicated with the second pipe section;

the third pipe section is vertically arranged, the top opening of the third pipe section is communicated with the outside atmosphere, and the bottom opening of the third pipe section is communicated with the second pipe section;

scales are uniformly arranged on the pipe body of the first pipe section or the third pipe section in the vertical direction, the second pipe section is filled with liquid, and the first pipe section and the third pipe section are partially filled with liquid.

On the basis of the above technical solution, preferably, the first pipe section, the second pipe section, and the third pipe section have the same inner diameter.

More preferably, the inner diameter of the transparent glass tube is 0.5-1 cm.

On the basis of the technical scheme, the device preferably further comprises a bracket and a tray,

the tray is horizontally arranged;

the second pipe section and the tray are vertically arranged and fixed at the upper end and the lower end of the support respectively.

On the basis of the above technical solution, preferably, the device further comprises a second hose and a funnel, wherein,

two ends of the second hose are respectively communicated with the third pipe section and the funnel.

Still further preferably, the transparent glass tube further comprises a fourth tube section, the fourth tube section is horizontally arranged, two ends of the fourth tube section are respectively communicated with the third tube section and the second hose, and the first tube section, the second tube section, the third tube section and the fourth tube section are integrally formed.

On the basis of above technical scheme, preferred, still include square aluminum-shell lithium ion battery, square aluminum-shell lithium ion battery surface is provided with annotates the liquid mouth, hollow syringe needle inserts in annotating the liquid mouth and sealed annotate the liquid mouth, and hollow syringe needle and annotate and seal each other between the liquid mouth.

Still further preferably, the surface of the square aluminum-shell lithium ion battery is provided with an explosion-proof valve, the hollow needle is inserted into the explosion-proof valve, and the hollow needle and the explosion-proof valve are sealed with each other.

The utility model discloses a lithium cell internal pressure testing arrangement has following beneficial effect for prior art:

(1) through setting up the transparent glass pipe that is "U" shape structure, can prevent that gas from passing liquid escape to prevent to detect inefficacy, the utility model discloses can judge fast that battery inside is negative pressure state or malleation state, also can calculate battery internal pressure and atmospheric pressure difference, simultaneously, the device simple easy manufacturing of structure, low cost, convenient operation possesses the large tracts of land and uses widely and worth.

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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the internal pressure testing device of the lithium battery of the present invention;

fig. 2 is a perspective view of the lithium battery of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to 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 in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1, the utility model discloses a lithium battery internal pressure testing device, it includes hollow syringe needle 1, first hose 2, clear glass pipe 3, support 4, tray 5, second hose 6 and funnel 7.

The hollow needle 1 is used for being inserted into a lithium battery to lead out gas and can adopt the prior art.

The first hose 2 serves as an air guide.

The transparent glass tube 3 includes a first tube segment 31, a second tube segment 32 and a third tube segment 33 which are sequentially communicated.

The second tube section 32 is horizontally disposed;

the first pipe section 31 is vertically arranged, the top opening of the first pipe section is communicated with the first hose 2, and the bottom opening of the first pipe section is communicated with the second pipe section 32;

the third pipe section 33 is vertically arranged, the top opening of the third pipe section is communicated with the outside atmosphere, and the bottom opening of the third pipe section is communicated with the second pipe section 32;

scales are uniformly arranged on the pipe body of the first pipe section 31 or the third pipe section 33 in the vertical direction, liquid is filled in the second pipe section 32, and liquid is partially filled in the first pipe section 31 and the third pipe section 33. Therefore, the first pipe section 31, the second pipe section 32 and the third pipe section 33 are integrally U-shaped, and after the gas enters the first pipe section 31, the liquid in the first pipe section 31 can only be driven to move to one side of the third pipe section 33, so that the gas is prevented from leaking out through the liquid, and the detection is disabled. When the liquid in the first pipe section 31, the second pipe section 32 and the third pipe section 33 moves, the scale on the first pipe section 31 or the third pipe section 33 is read, so that the change value of the liquid level can be obtained, and further the air pressure can be obtained through calculation.

Specifically, the first pipe section 31, the second pipe section 32 and the third pipe section 33 have the same inner diameter. Specifically, the inner diameter of the transparent glass tube 3 is 0.5-1 cm.

The tray 5 is horizontally arranged and plays a stabilizing role.

And the bracket 4 is used for supporting and fixing the transparent glass tube 3, and the second tube section 32 and the tray 5 are vertically arranged and are respectively fixed at the upper end and the lower end.

A funnel 7 for introducing and discharging liquid.

And two ends of the second hose 6 are respectively communicated with the third pipe section 33 and the funnel 7, so that liquid can be conveniently led in and discharged.

In order to prevent the second hose 6 from being bent at the position directly connected with the third pipe section 33 and affecting the communication between the second hose and the atmosphere, the transparent glass tube 3 further comprises a fourth pipe section 34, the fourth pipe section 34 is horizontally arranged, two ends of the fourth pipe section 34 are respectively communicated with the third pipe section 33 and the second hose 6, and the first pipe section 31, the second pipe section 32, the third pipe section 33 and the fourth pipe section 34 are integrally formed.

The square aluminum-shell lithium ion battery S can adopt the prior art, the surface of the square aluminum-shell lithium ion battery (S) is provided with a liquid injection port S1, the hollow needle 1 is inserted into the liquid injection port S1 and seals the liquid injection port S1, and the hollow needle 1 and the liquid injection port S1 are mutually sealed;

or the surface of the square aluminum-shell lithium ion battery S is provided with an explosion-proof valve S2, the hollow needle 1 is inserted into the explosion-proof valve S2, and the hollow needle 1 and the explosion-proof valve S2 are sealed with each other;

in the two modes, the internal air pressure of the square aluminum shell lithium ion battery S can be detected.

The following description is provided with reference to specific embodiments, in which the application method of the internal pressure testing device for lithium batteries of the present invention is described.

Example 1

Putting a finished product square aluminum shell lithium ion battery S after sealing welding on a table top, aligning a hollow needle 1 to an explosion-proof valve S2, applying pressure to enable the hollow needle 1 to pierce the explosion-proof valve S2, observing and reading the liquid level height difference between the two sides of a first pipe section 31 and a third pipe section 33 through a transparent glass tube 3, if the liquid level of the first pipe section 31 is higher than the liquid level of the third pipe section 33, indicating that the internal pressure of the battery is less than atmospheric pressure, judging that the internal of the battery is in a negative pressure state, otherwise, judging that the internal of the battery is in a positive pressure state, and calculating the specific value of the internal pressure of the battery according to the following formula:

P ₁ -P ₀ ＝ΔP＝ρgΔh

wherein, P ₁ Is the internal pressure of the battery, P ₀ The pressure is atmospheric pressure, ρ is the density of the liquid in the transparent glass tube 3, g is the gravitational acceleration constant, and Δ h is the liquid level difference between the first tube section 31 and the third tube section 33.

In order to prevent the hollow needle 1 from being improperly operated when penetrating the explosion-proof valve S2 and causing gas to enter and exit from the vicinity of the penetrating opening during operation, the solidification and sealing treatment can be performed by using AB glue in the vicinity of the penetrating opening.

Example 2

The unsealed square aluminum shell lithium ion battery S is placed on a table top, the hollow needle 1 is inserted into the liquid injection port S1, the joint of the hollow needle 1 and the liquid injection port S2 is solidified and sealed by AB glue, and the gas production of the battery in a high-temperature environment and the gas production of the battery in a charging and discharging process can be measured by the formula described in the embodiment 1.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery internal pressure testing device comprises a hollow needle head (1), a first hose (2) and a transparent glass tube (3),

the first hose (2) is communicated with the hollow needle head (1);

the method is characterized in that: the transparent glass tube (3) comprises a first tube section (31), a second tube section (32) and a third tube section (33) which are communicated in sequence,

the second pipe section (32) is horizontally arranged;

the first pipe section (31) is vertically arranged, the top opening of the first pipe section is communicated with the first hose (2), and the bottom opening of the first pipe section is communicated with the second pipe section (32);

the third pipe section (33) is vertically arranged, the top opening of the third pipe section is communicated with the outside atmosphere, and the bottom opening of the third pipe section is communicated with the second pipe section (32);

scales are uniformly arranged on the pipe body of the first pipe section (31) or the third pipe section (33) in the vertical direction, liquid is filled in the second pipe section (32), and liquid is partially filled in the first pipe section (31) and the third pipe section (33).

2. The lithium battery internal pressure test device according to claim 1, characterized in that: the first pipe section (31), the second pipe section (32) and the third pipe section (33) are equal in inner diameter.

3. The lithium battery internal pressure test device according to claim 2, characterized in that: the inner diameter of the transparent glass tube (3) is 0.5-1 cm.

4. The lithium battery internal pressure test device according to claim 1, characterized in that: also comprises a bracket (4) and a tray (5),

the tray (5) is horizontally arranged;

the bracket (4) is vertically arranged, and the upper end and the lower end of the bracket are respectively fixed with the second pipe section (32) and the tray (5).

5. The lithium battery internal pressure test device according to claim 1, characterized in that: further comprising a second hose (6) and a funnel (7), wherein,

two ends of the second hose (6) are respectively communicated with the third pipe section (33) and the funnel (7).

6. The lithium battery internal pressure test device according to claim 5, characterized in that: the transparent glass tube (3) further comprises a fourth tube section (34), the fourth tube section (34) is horizontally arranged, two ends of the fourth tube section are respectively communicated with the third tube section (33) and the second hose (6), and the first tube section (31), the second tube section (32), the third tube section (33) and the fourth tube section (34) are integrally formed.

7. The lithium battery internal pressure test device according to claim 1, characterized in that: still include square aluminum-shell lithium ion battery (S), square aluminum-shell lithium ion battery (S) surface is provided with annotates liquid mouth (S1), hollow syringe needle (1) is inserted and is annotated in liquid mouth (S1) and sealed annotate liquid mouth (S1), and hollow syringe needle (1) and annotate and seal each other between liquid mouth (S1).

8. The lithium battery internal pressure test device according to claim 7, characterized in that: the surface of the square aluminum shell lithium ion battery (S) is provided with an explosion-proof valve (S2), the hollow needle (1) is inserted into the explosion-proof valve (S2), and the hollow needle (1) and the explosion-proof valve (S2) are sealed mutually.