A collection device for the formation gas of square lithium-ion batteries

Abstract

This utility model discloses a collection device for formation gases from square lithium-ion batteries, comprising left and right clamping components, front and rear clamping components, and a collection component. The left and right clamping components and the front and rear clamping components are fixedly arranged perpendicularly to each other. Each of the left and right clamping components and the front and rear clamping components has two sets of clamping arms that move synchronously and centered. Multiple sets of clamping arms clamp the sides of the square lithium-ion battery. The front and rear clamping components are fixedly located below the left and right clamping components. The collection component is positioned at the center of the lower part of the front and rear clamping components via a lifting drive cylinder. The collection component is sealed and installed at the gas outlet of the square lithium-ion battery, and is connected to several gas collection bags. The advantage of this utility model is that it facilitates the collection of formation gases at different stages, making collection more convenient and faster.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery preparation technology, and in particular to a collection device suitable for the formation gas of square lithium-ion batteries. Background Technology

[0002] Battery formation mainly refers to the process by which an SEI film (solid electrolyte interphase film) forms on the surface of the negative electrode during the first charge of a lithium battery, accompanied by the generation of formation gases (CO2, H2, etc.). The quality of the SEI film has a significant impact on the cycle life, stability, self-discharge, and safety of lithium batteries.

[0003] The volume, composition, and content of each component of the formation gas during battery formation can reflect the quality of the SEI film. Therefore, research on the volume, composition, and content of each component of the formation gas can serve as a guide for optimizing the various component materials of lithium batteries, thereby providing analytical support for improving the overall performance of lithium batteries.

[0004] Existing formation gases cannot be collected in multiple stages, and the collection methods are quite cumbersome. Utility Model Content

[0005] The purpose of this invention is to provide a collection device for the formation gas of square lithium-ion batteries, which can facilitate the collection of formation gas at different stages, making the collection more convenient and faster.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A collection device for the formation gas of a square lithium-ion battery is characterized by comprising a left and right clamping assembly, a front and rear clamping assembly, and a collection assembly. The left and right clamping assemblies and the front and rear clamping assemblies are fixedly arranged perpendicularly to each other. Each of the left and right clamping assemblies and the front and rear clamping assemblies has two sets of clamping arms that move synchronously and centered. The clamping arms clamp the sides of the square lithium-ion battery respectively. The front and rear clamping assemblies are fixedly arranged below the left and right clamping assemblies. The collection assembly is arranged at the center of the lower part of the front and rear clamping assemblies through a lifting drive cylinder. The collection assembly is sealed and installed at the gas outlet of the square lithium-ion battery. The collection assembly is connected to several gas collection bags.

[0008] Preferably, both the left and right clamping components and the front and rear clamping components include a mounting base, a screw, movable blocks, and a drive motor. The mounting base is hollow, and the screw is rotatably mounted inside the mounting base. The screw has counterclockwise and clockwise threads symmetrically arranged on both sides. The two sets of movable blocks are respectively driven and mounted on both sides of the screw through counterclockwise and clockwise threads. One end of the screw is connected to the drive motor on one side of the fixed base. The two sets of movable blocks move synchronously and centered along the inside of the mounting base.

[0009] Preferably, a limiting groove is provided below the mounting base corresponding to the movement trajectory of the movable block, and one end of the clamping arm passes through the limiting groove and is fixedly connected to the movable block.

[0010] Preferably, a pressure sensor is provided on the contact surface between the other end of the clamping arm and the side of the square lithium-ion battery, and the pressure sensor is electrically connected to the drive motor of the corresponding left and right clamping components or front and rear clamping components.

[0011] Preferably, a balance block is fixedly mounted on the end of the mounting base away from the drive motor.

[0012] Preferably, the mounting bases of the left and right clamping components and the front and rear clamping components are fixedly connected at the four corners by connecting blocks.

[0013] Preferably, the collection assembly includes a collection seat, a solenoid valve, and a collection hose. The collection seat has an opening at the bottom, which is sealed to the air outlet of the square lithium-ion battery. The side wall of the collection seat has an array of collection ports. Each set of collection ports is equipped with a solenoid valve outside the collection seat. Each set of solenoid valves is connected to the gas collection bag through the collection hose.

[0014] Preferably, the connection end of the collecting hose and the gas collecting bag is fixedly installed on the corresponding connecting block by a snap fastener.

[0015] Preferably, an elastic sealing ring is provided on the outer edge of the bottom opening of the collection seat, and the bottom opening of the collection seat is elastically sealed to the air outlet of the square lithium-ion battery through the elastic sealing ring.

[0016] In summary, the beneficial effects of this utility model are as follows: First, the left and right clamping components and the front and rear clamping components are clamped and fixed to the sides of the square lithium-ion battery. After clamping, the lifting drive cylinder presses down the collection seat to seal the gas outlet of the square lithium-ion battery. The electromagnetic valve is used to collect the formation gas of the square lithium-ion battery at different stages in sequence, which facilitates the subsequent accurate detection of the formation gas composition. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of the front of this utility model;

[0018] Figure 2 This is a schematic diagram of the bottom structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the internal structure of the left and right clamping components and the front and rear clamping components of this utility model. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on this utility model.

[0021] like Figures 1 to 3 The device shown is suitable for collecting gas from the formation of square lithium-ion batteries. It includes left and right clamping components, front and rear clamping components, and a collection component. The left and right clamping components and the front and rear clamping components are fixedly arranged perpendicularly to each other. Two sets of clamping arms 1 that move synchronously and centered are symmetrically arranged on the left and right clamping components and the front and rear clamping components. Multiple sets of clamping arms 1 clamp the sides of the square lithium-ion battery 3 respectively. The front and rear clamping components are fixedly arranged below the left and right clamping components. The collection component is set at the center of the lower part of the front and rear clamping components through a lifting drive cylinder 2. The collection component is sealed and installed at the gas outlet 4 of the square lithium-ion battery 3. The collection component is connected to multiple gas collection bags 5.

[0022] Both the left and right clamping components and the front and rear clamping components include a mounting base 6, a screw 7, movable blocks 8, and a drive motor 9. The mounting base 6 is hollow, and the screw 7 is rotatably mounted inside the mounting base 6. The screw 7 has counterclockwise and clockwise threads symmetrically arranged on both sides. The two sets of movable blocks 8 are mounted on both sides of the screw 7 through counterclockwise and clockwise threads, respectively. One end of the screw 7 is connected to the drive motor 9 on one side of the fixed base. The two sets of movable blocks 8 move synchronously and center along the inside of the mounting base 6.

[0023] A limiting groove 10 is provided below the mounting base 6 corresponding to the movement trajectory of the movable block 8, and one end of the clamping arm 1 passes through the limiting groove 10 and is fixedly connected to the movable block 8.

[0024] A pressure sensor 11 is provided on the contact surface between the other end of the clamping arm 1 and the side of the square lithium-ion battery 3. The pressure sensor 11 is electrically connected to the drive motor 9 of the corresponding left and right clamping components or front and rear clamping components. The corresponding drive motor 9 can be stopped after the pressure sensor 11 at both ends detects the clamping pressure.

[0025] The mounting base 6 has a balance block 12 fixedly installed at the end away from the drive motor 9. The balance block 12 is used to balance the two ends of the left and right clamping components and the front and rear clamping components, so as to avoid tilting.

[0026] The mounting bases 6 for the left and right clamping components and the front and rear clamping components are all fixedly connected at the four corners by connecting blocks 13, making the structure more stable.

[0027] The collection assembly includes a collection seat 14, a solenoid valve 15, and a collection hose 16. The bottom of the collection seat 14 has an opening, which is sealed to the air outlet 4 of the square lithium-ion battery 3. An array of collection ports 17 are provided on the side wall of the collection seat 14. A solenoid valve 15 is provided outside each set of collection ports 17. Each set of solenoid valves 15 is connected to the air collection bag 5 through the collection hose 16.

[0028] The connection end of the collection hose 16 and the gas collection bag 5 is fixedly installed on the corresponding connection block 13 by the buckle 18, which facilitates the replacement of the gas collection bag 5.

[0029] An elastic sealing ring 19 is provided on the outer edge of the bottom opening of the collection seat 14, and the bottom opening of the collection seat 14 is elastically sealed to the air outlet 4 of the square lithium-ion battery 3 through the elastic sealing ring 19.

[0030] This invention first uses left and right clamping components and front and rear clamping components to clamp and fix the square lithium-ion battery to the sides. After clamping, the lifting drive cylinder presses down the collection seat to seal the gas outlet of the square lithium-ion battery. The electromagnetic valve sequentially collects the formation gas of the square lithium-ion battery at different stages, which facilitates the subsequent accurate detection of the formation gas composition.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present utility model's technical solution.

Claims

1. A collection device for the formation gas of square lithium-ion batteries, characterized in that, The device includes left and right clamping components, front and rear clamping components, and a collection component. The left and right clamping components and the front and rear clamping components are fixedly arranged perpendicularly to each other. Each of the left and right clamping components and the front and rear clamping components has two sets of clamping arms that move synchronously and centered. The clamping arms clamp the sides of the square lithium-ion battery. The front and rear clamping components are fixedly arranged below the left and right clamping components. The collection component is set at the center of the lower part of the front and rear clamping components through a lifting drive cylinder. The collection component is sealed and installed at the air outlet of the square lithium-ion battery. The collection component is connected to several air collection bags.

2. The collection device for the formation gas of a square lithium-ion battery according to claim 1, characterized in that: The left and right clamping components and the front and rear clamping components each include a mounting base, a screw, movable blocks, and a drive motor. The mounting base is hollow, and the screw is rotatably mounted inside the mounting base. The screw has counterclockwise and clockwise threads symmetrically arranged on both sides. The two sets of movable blocks are respectively driven and mounted on both sides of the screw through counterclockwise and clockwise threads. One end of the screw is connected to the drive motor on one side of the fixed base. The two sets of movable blocks move synchronously and centered along the inside of the mounting base.

3. The collection device for the formation gas of a square lithium-ion battery according to claim 2, characterized in that: A limiting groove is provided below the mounting base corresponding to the movement trajectory of the movable block, and one end of the clamping arm passes through the limiting groove and is fixedly connected to the movable block.

4. A collection device for the formation gas of a square lithium-ion battery according to claim 3, characterized in that: A pressure sensor is provided on the contact surface between the other end of the clamping arm and the side of the square lithium-ion battery. The pressure sensor is electrically connected to the drive motor of the corresponding left and right clamping components or front and rear clamping components.

5. A collection device for formation gas from square lithium-ion batteries according to claim 3, characterized in that: The mounting base has a balance block fixedly installed at the end away from the drive motor.

6. A collection device for formation gas from square lithium-ion batteries according to claim 3, characterized in that: The mounting bases of the left and right clamping components and the front and rear clamping components are all fixedly connected at the four corners by connecting blocks.

7. A collection device for formation gas from square lithium-ion batteries according to claim 6, characterized in that: The collection assembly includes a collection seat, a solenoid valve, and a collection hose. The bottom of the collection seat has an opening, which is sealed around the vent of the square lithium-ion battery. The side wall of the collection seat has an array of collection ports. Each set of collection ports is equipped with a solenoid valve outside the collection seat. Each set of solenoid valves is connected to the gas collection bag through the collection hose.

8. A collection device for formation gas from square lithium-ion batteries according to claim 7, characterized in that: The connection end of the collection hose and the gas collection bag is fixedly installed on the corresponding connecting block by a snap fastener.

9. A collection device for formation gas from square lithium-ion batteries according to claim 7, characterized in that: An elastic sealing ring is provided on the outer edge of the bottom opening of the collection seat, and the bottom opening of the collection seat is elastically sealed to the air outlet of the square lithium-ion battery through the elastic sealing ring.

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