Soft package cell air tightness detection device

Abstract

A soft package battery cell air tightness detection device comprises a detection table used for conducting air tightness detection on battery cell packages, a water tank used for containing the battery cell packages is arranged on the detection table, and a plurality of compartments used for containing the independent battery cell packages are arranged in the water tank; the detection table is provided with a plurality of detection assemblies in one-to-one correspondence with the cell packages, the detection table is also provided with a double-shaft cylinder for driving the plurality of detection assemblies to lift synchronously, and the double-shaft cylinder is connected with a regulating valve for regulating the output pressure of the double-shaft cylinder; compared with the prior art, gas flows out of the battery cell package under the action of pressure, bubbles can appear in the liquid in the water tank at the moment, so that the detection effect is obvious, the situation of missed judgment is avoided, meanwhile, synchronous detection of a plurality of battery cells can be realized through the plurality of compartments and the detection assemblies in one-to-one correspondence with the compartments, and the detection efficiency is improved. And the detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production, and in particular to a soft-pack battery core air tightness detection device. Background Art

[0002] Soft-pack lithium battery is a common lithium battery with the advantages of good safety performance, light weight, large capacity, small internal resistance and flexible appearance design.

[0003] The internal chemical system of lithium batteries is active and can easily react with external moisture and air, causing battery performance degradation or failure. Therefore, the air tightness of the package is crucial to the reliability and safety of lithium batteries. How to effectively detect the air tightness of soft-pack lithium batteries and ensure that defective packages do not flow into the consumer market is of great significance.

[0004] To solve the above problems, a Chinese patent with application number 201910925740.9 discloses an airtight detection method for soft-pack lithium batteries. The above-disclosed detection method includes the steps of: loading the battery cell into the battery cell area, loading the airbag into the airbag area; packaging the top seal area, the side seal area and the seal area; puncturing the airbag area and extracting the gas in the airbag area; squeezing the airbag to rupture the airbag and release the gas to be tested; guiding the gas to be tested released by the airbag to the battery cell area; packaging the second seal area; and detecting whether the gas to be tested escapes from the soft-pack lithium battery. A Chinese patent with application number 202110745645.8 discloses a soft-pack battery airtightness detection device and a detection method. The above-disclosed detection device includes a sealed box, a pressure testing device and a vacuum pump. The pressure testing device includes a driving device, a pressing plate and a pressure sensor. The vacuum pump is connected to the sealed box; a sealed cavity is provided in the sealed box, and the pressing plate, the pressure sensor and the soft-pack battery are all located in the sealed cavity. The driving device is connected to the pressing plate and is used to drive the pressing plate to squeeze the soft-pack battery; when the pressing plate squeezes the soft-pack battery, the pressure sensor is in contact with the soft-pack battery.

[0005] In the above-disclosed prior art, when testing the air tightness of battery cells, only one battery cell can be tested at a time, batch testing cannot be achieved, and the testing efficiency is low. At the same time, during the testing, the testing effect is not obvious and missed judgments are likely to occur. Utility Model Content

[0006] The utility model aims to overcome the defects in the prior art and provide a soft-pack battery core air tightness detection device with high detection efficiency, obvious detection results and no missed detection.

[0007] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme: a soft-pack battery cell airtightness detection device, including a detection platform for performing airtightness detection on the battery cell package, the detection platform is provided with a water tank for placing the battery cell package, and the water tank is provided with a plurality of compartments for placing individual battery cell packages; the detection platform is provided with a plurality of detection components corresponding one by one to the battery cell package, and the detection platform is also provided with a dual-axis cylinder for driving the plurality of detection components to rise and fall synchronously, and the dual-axis cylinder is connected to a regulating valve for adjusting the output pressure of the dual-axis cylinder.

[0008] As a preferred solution of the utility model, the water tank is arranged along the length direction of the detection platform, and the plurality of compartments are equidistantly distributed along the length direction of the water tank.

[0009] As a preferred solution of the utility model, a partition is provided between adjacent compartments, a slide groove is formed on the side wall of the water tank along the height direction of the water tank, and the partition is arranged in the slide groove.

[0010] As a preferred solution of the utility model, the water tank is a transparent structure.

[0011] As a preferred solution of the utility model, the detection component includes a pressing plate and a buffer pad arranged above the battery cell package, the buffer pad is arranged at the bottom of the pressing plate, and the buffer pad abuts against the battery cell package.

[0012] As a preferred solution of the utility model, the pressing plate is arranged in parallel with the battery cell package.

[0013] As a preferred solution of the utility model, a plurality of the pressing plates are arranged along the length direction of the water tank, and a plurality of the pressing plates are located directly above the corresponding compartments, and a plurality of the pressing plates correspond one-to-one to a plurality of the battery cell packages.

[0014] As a preferred solution of the utility model, the output end of the dual-axis cylinder is connected to a mounting frame for mounting the detection component, and a connecting rod connected to a plurality of pressure plates one by one is provided at the bottom of the mounting frame.

[0015] As a preferred solution of the utility model, a support frame for mounting a dual-axis cylinder is provided on the detection platform, and the output end of the dual-axis cylinder passes through the support frame and is connected to the mounting frame.

[0016] As a preferred solution of the utility model, the dual-axis cylinder is connected to a first air pipe and a second air pipe, the first air pipe is connected to a pressure gauge for detecting the output pressure of the dual-axis cylinder, and the regulating valve is arranged on the second air pipe.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. By placing a number of battery cell packages in different compartments of the water tank, the dual-axis cylinder drives a number of detection components to descend synchronously, the detection components abut against the battery cell packages, and apply pressure to the battery cell packages. When there is an airtightness problem in the battery cell packages, the gas flows out of the battery cell packages under the action of pressure, and bubbles will appear in the liquid in the water tank at this time, so that the detection effect is obvious and there will be no missed judgment. At the same time, through a number of compartments and detection components corresponding to the compartments one by one, multiple battery cells can be detected synchronously, thereby improving the efficiency of detection;

[0019] 2. Furthermore, by setting a plurality of chutes in the water tank, partitions are set in the chutes, and the size and number of the compartments can be adjusted according to the battery cells of different specifications and sizes, thereby satisfying the detection work of the battery cells of different specifications and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model

[0021] Figure markings: test bench 1, support frame 101, water tank 2, chute 201, partition 202, compartment 203, battery cell package 3, test assembly 4, buffer pad 401, pressure plate 402, dual-axis cylinder 5, first air pipe 501, pressure gauge 5011, second air pipe 502, regulating valve 5021, mounting frame 6, connecting rod 601. DETAILED DESCRIPTION

[0022] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, a soft-pack battery cell air tightness detection device includes a detection platform 1 for performing air tightness detection on a battery cell package 3, the detection platform 1 is provided with a water tank 2 for placing the battery cell package 3, and the water tank 2 is provided with a plurality of compartments 203 for placing individual battery cell packages 3; the detection platform 1 is provided with a plurality of detection components 4 corresponding one to one with the battery cell packages 3, the detection platform 1 is also provided with a double-axis cylinder 5 for driving the plurality of detection components 4 to rise and fall synchronously, and the double-axis cylinder 5 is connected with a regulating valve 5021 for adjusting the output pressure of the double-axis cylinder 5.

[0024] Furthermore, the detection component 4 is suspended just above the water tank 2, and is driven to rise and fall under the action of the dual-axis cylinder 5, so that the detection component 4 enters the water tank 2, and squeezes the battery cell package 3 in the water tank 2 for a certain period of time, and observes and determines whether there are bubbles around the battery cell package 3. If there are bubbles, the air tightness of the position where the bubbles are generated does not meet the requirements; if there are no bubbles, the air tightness of the battery cell package 3 meets the requirements.

[0025] Furthermore, a water tank 2 is arranged along the length direction of the detection platform 1, and is filled with deionized water or other liquids that are convenient for observing bubbles. A number of compartments 203 are evenly distributed along the length direction of the water tank 2, and the battery cell package 3 is placed in the compartment 203. The size of each compartment 203 can be the same, or it can be adjusted according to the size of the battery cell package 3 to meet the detection of battery cell packages 3 of different specifications and sizes.

[0026] A partition 202 is provided between adjacent compartments 203, and a slide groove 201 is formed on the side wall of the water tank 2 along the height direction of the water tank 2. The partition 202 is arranged in the slide groove 201. Furthermore, a compartment 203 is formed between two adjacent partitions 202, and a plurality of slide grooves 201 are provided. Several slide grooves 201 are equidistantly distributed along the length direction of the water tank 2, and the partition 202 is inserted into the slide groove 201. According to the specific size of the battery cell package 3, the partition 202 is adjusted and inserted into the corresponding slide groove 201, while meeting the size requirements of the battery cell package 3.

[0027] In addition, a compartment 203 is formed by plugging the partition 202 in the water tank 2, thereby isolating several battery cell packages 3 placed in the water tank 2. When the battery cell packages 3 are tested for air tightness, it is prevented that bubbles appearing on one battery cell package 3 move to other battery cell packages 3, thereby affecting the judgment of other battery cell packages 3. The battery cell packages 3 are separated by the partition 202, thereby ensuring the independence of each battery cell package 3, thereby improving the accuracy of the air tightness judgment of the battery cell package 3.

[0028] The water tank 2 is a transparent structure. Furthermore, the water tank 2 can be made of glass, acrylic or other transparent materials. By setting the water tank 2 as a transparent structure, it is easy to observe the bubbles near the battery cell package 3.

[0029] The detection component 4 includes a pressure plate 402 and a buffer pad 401 arranged above the battery cell package 3. The buffer pad 401 is arranged at the bottom of the pressure plate 402, and the buffer pad 401 is abutted against the battery cell package 3. Furthermore, the pressure plate 402 is suspended and arranged directly above the battery cell package 3. The buffer pad 401 is fixed to the bottom surface of the pressure plate 402. The buffer pad 401 can be made of rubber or other soft materials. When the pressure plate 402 moves downward onto the battery cell package 3, the battery cell package 3 is protected by the buffer pad 401, thereby preventing the pressure plate 402 from crushing the battery cell package 3.

[0030] The pressing plate 402 is arranged parallel to the battery cell package 3. Furthermore, by arranging the pressing plate 402 parallel to the battery cell package 3, it is ensured that when the pressing plate 402 squeezes the battery cell package 3, the contact area between the pressing plate 402 and the battery cell package 3 is maximized, the pressure borne by the battery cell package 3 is minimized, and the gas in the battery cell package 3 can also be fully squeezed.

[0031] A plurality of pressing plates 402 are arranged along the length direction of the water tank 2, and a plurality of pressing plates 402 are located directly above the corresponding compartments 203, and a plurality of pressing plates 402 correspond one-to-one to a plurality of battery cell packages 3, ensuring that a plurality of battery cell packages 3 can be tested simultaneously.

[0032] The output end of the dual-axis cylinder 5 is connected to a mounting frame 6 for mounting a detection component 4. A connecting rod 601 connected to a plurality of pressure plates 402 is provided at the bottom of the mounting frame 6. A plurality of detection components 4 are connected through the mounting frame 6 and the connecting rod 601. At the same time, a support frame 101 for mounting the dual-axis cylinder 5 is provided on the detection platform 1. The output end of the dual-axis cylinder 5 is connected to the mounting frame 6 through the support frame 101. Under the action of the dual-axis cylinder 5, the detection component 4 is driven to move synchronously, thereby performing simultaneous detection on a plurality of battery cell packages 3, thereby improving the detection efficiency.

[0033] The dual-axis cylinder 5 is connected to a first air pipe 501 and a second air pipe 502. The first air pipe 501 is connected to a pressure gauge 5011 for detecting the output pressure of the dual-axis cylinder 5. The regulating valve 5021 is arranged on the second air pipe 502. The output pressure of the dual-axis cylinder 5 is regulated by the pressure gauge 5011 and the regulating valve 5021 to ensure that the pressure applied to the battery cell package 3 meets the detection requirements without causing damage to the battery cell package 3.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0035] Although this article uses more of the following terms: test bench 1, support frame 101, water tank 2, chute 201, partition 202, compartment 203, battery cell package 3, test assembly 4, buffer pad 401, pressure plate 402, double-axis cylinder 5, first air pipe 501, pressure gauge 5011, second air pipe 502, regulating valve 5021, mounting frame 6, connecting rod 601, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A device for testing the air tightness of a soft-package battery cell, comprising a testing platform (1) for testing the air tightness of a battery cell package (3), characterized in that: The detection platform (1) is provided with a water tank (2) for placing the battery cell packages (3), and the water tank (2) is provided with a plurality of compartments (203) for placing individual battery cell packages (3); the detection platform (1) is provided with a plurality of detection components (4) corresponding one to one with the battery cell packages (3); the detection platform (1) is also provided with a double-axis cylinder (5) for driving the plurality of detection components (4) to rise and fall synchronously, and the double-axis cylinder (5) is connected with a regulating valve (5021) for regulating the output pressure of the double-axis cylinder (5).

2. A soft-pack battery core air tightness detection device according to claim 1, characterized in that: The water tank (2) is arranged along the length direction of the detection platform (1), and a plurality of compartments (203) are distributed equidistantly along the length direction of the water tank (2).

3. A soft-pack battery core air tightness detection device according to claim 1, characterized in that: A partition (202) is provided between adjacent compartments (203), a slide groove (201) arranged along the height direction of the water tank (2) is formed on the side wall of the water tank (2), and the partition (202) is arranged in the slide groove (201).

4. A soft-pack battery core air tightness detection device according to claim 1, characterized in that: The water tank (2) is a transparent structure.

5. The air tightness detection device for a soft-pack battery cell according to claim 1, characterized in that: The detection component (4) comprises a pressing plate (402) and a buffer pad (401) arranged above the battery cell package (3); the buffer pad (401) is arranged at the bottom of the pressing plate (402), and the buffer pad (401) is in contact with the battery cell package (3).

6. A soft-pack battery core air tightness detection device according to claim 5, characterized in that: The pressing plate (402) is arranged in parallel with the battery cell package (3).

7. A soft-pack battery core air tightness detection device according to claim 5, characterized in that: The plurality of pressing plates (402) are arranged along the length direction of the water tank (2), and the plurality of pressing plates (402) are located directly above the corresponding compartments (203), and the plurality of pressing plates (402) correspond one-to-one to the plurality of battery cell packages (3).

8. The air tightness detection device for a soft-pack battery cell according to claim 5, characterized in that: The output end of the dual-axis cylinder (5) is connected to a mounting frame (6) for mounting the detection component (4), and a connecting rod (601) connected one by one to a plurality of pressing plates (402) is provided at the bottom of the mounting frame (6).

9. A soft-pack battery core air tightness detection device according to claim 8, characterized in that: The detection platform (1) is provided with a support frame (101) for mounting a double-axis cylinder (5), and the output end of the double-axis cylinder (5) passes through the support frame (101) and is connected to a mounting frame (6).

10. The air tightness detection device for a soft-pack battery cell according to claim 1, characterized in that: The double-axis cylinder (5) is connected to a first air supply pipe (501) and a second air supply pipe (502); the first air supply pipe (501) is connected to a pressure gauge (5011) for detecting the output pressure of the double-axis cylinder (5); and the regulating valve (5021) is arranged on the second air supply pipe (502).

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