Battery cell leak detection device and battery cell leak detection assembly line

Abstract

The utility model relates to the technical field of sealing performance testing, in particular to a battery cell leakage detection device and a battery cell leakage detection assembly line. The utility model provides a battery cell leak detection device which comprises a cup stand, and a plurality of battery cells are fixed on the cup stand. The vacuum assembly is arranged at the upper part of the cup holder, the vacuum assembly comprises a plurality of first sealing cavities, the first sealing cavities can move downwards to nest and seal battery cells, the first sealing cavities are communicated with a first air pump for vacuumizing through a first air exhaust pipeline, and a pressure gauge for measuring the pressure in the first sealing cavities is fixed on the first air exhaust pipeline; the first lifting assembly is fixedly connected with the vacuum assembly and can drive the first sealing cavity to move up and down. The device is simple in structure and convenient to maintain, large leakage detection is carried out on the battery cell before RGA detection, an electrolyte can be prevented from polluting the RGA detection cavity, and the detection accuracy and the detection efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of sealing test technology, specifically to a battery cell leak detection device and a battery cell leak detection production line. Background Technology

[0002] In the lithium battery production process, sealing is a crucial indicator of battery quality, making cell sealing testing an indispensable step. RGA quadrupole mass spectrometry leak detection primarily uses mass spectrometry to measure the mass of gas molecules to determine gas composition. This technology, based on its high precision and sensitivity, can monitor the electrolyte composition, thus detecting cell sealing issues. However, existing detection methods have the following problems:

[0003] 1. During RGA testing under vacuum conditions, the electrolyte of large leakage cells is drawn out, contaminating the testing chamber and making it difficult to clean;

[0004] 2. During RGA testing, the cavity contaminated by electrolyte interferes with the test results of other cells, and the automatic cavity cleaning time is long, affecting the accuracy and efficiency of the test. Utility Model Content

[0005] To address the technical problem that existing RGA testing is easily contaminated by electrolyte, affecting leak detection efficiency, this utility model provides a cell leak detection device and cell leak detection production line with simple structure and easy maintenance, enabling large leak detection of cells before RGA testing.

[0006] This utility model provides a battery cell leak detection device, comprising: a cup holder on which multiple battery cells are fixed; a vacuum assembly disposed on the upper part of the cup holder, the vacuum assembly including multiple first sealed cavities, the first sealed cavities being movable downward to nest and seal the battery cells, the first sealed cavities being connected to a first vacuum pump through a first vacuum pipe, the first vacuum pipe being fixed with a pressure gauge for measuring the pressure inside the first sealed cavities; and a first lifting assembly fixedly connected to the vacuum assembly and capable of driving the first sealed cavities to move up and down.

[0007] Furthermore, the cup holder is provided with parallel rows of battery cell groups, each battery cell group including multiple battery cells, and the first sealed cavity is also multiple and is set one-to-one with the battery cells on the cup holder.

[0008] Furthermore, the vacuum assembly includes a sealing frame, with multiple first sealing cavities having lower openings and being sealed to the lower part of the sealing frame. The sealing frame has air holes corresponding to each first sealing cavity that connect the first air pump and the first sealing cavity. The first lifting assembly is fixedly connected to the sealing frame.

[0009] Furthermore, the first lifting assembly includes a connecting rod, one end of which is fixedly connected to the sealing frame, and the other end of which is connected to a linear sliding pair.

[0010] A spring is installed inside the first sealed cavity, and the spring is compressed as the first sealed cavity moves downward.

[0011] This utility model provides a battery cell leak detection production line, including a battery cell leak detection device, a frame and a conveyor belt. The cup holder can be fixed to the conveyor belt and move with the conveyor belt. The first lifting component is fixed to the upper part of the frame and located above the conveyor belt. An RGA gas leak detection component is arranged behind the first lifting component along the forward direction of the conveyor belt.

[0012] The RGA gas leak detection assembly includes a second sealed cavity that can be sealed to the battery cell. The RGA gas leak detection assembly also includes an RGA gas analyzer. The second sealed cavity is sealed to a second gas pump through a second gas extraction pipeline. The second sealed cavity and the RGA gas analyzer are connected through the second gas extraction pipeline.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention has a simple structure, is easy to maintain, and enables large leakage detection of battery cells before RGA testing.

[0015] This invention first uses a first lifting assembly in conjunction with a vacuum assembly to perform large leak detection, and then uses a second lifting assembly in conjunction with a second sealed cavity to perform RGA gas leak detection. Compared with directly performing RGA gas leak detection, this invention can avoid electrolyte contamination of the RGA detection cavity and improve detection accuracy and efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of one embodiment of a cup holder.

[0019] Figure 3 This is a flowchart of one embodiment of the present invention.

[0020] Explanation of main attached figures: 1-Cup holder, 2-Battery cell, 3-First sealed cavity, 4-Sealed frame, 5-First air extraction pipe. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0022] One embodiment of this utility model provides a battery cell 2 leak detection device, including a cup holder 1, on which multiple battery cells 2 are fixed. The multiple battery cells 2 are arranged according to a predetermined pattern. One possible method for fixing the battery cells 2 in the cup holder 1 is that the cup holder 1 and the battery cells 2 are interference-fitted, and there is a large frictional force between the cup holder 1 and the battery cells 2, which can maintain the stability of the battery cells 2. Another possible method is to fix an elastic clamping member in the cup holder 1 for each battery cell 2, thereby maintaining the stability of the battery cell 2. The upper part of the cup holder 1 is a vacuum assembly, which includes multiple first sealing cavities 3. The first sealing cavities 3 cooperate with the battery cells 2 and are arranged according to the same pattern. The first sealing cavities 3 are located above the battery cells 2, and there is a one-to-one correspondence between the first sealing cavities 3 and the battery cells 2. The lower part of the first sealing cavity 3 is open. During operation, the first sealing cavity 3 is moved downwards, gradually moving towards the battery cell 2. Finally, the first sealing cavity 3 is nested outside the battery cell 2 and seals the battery cell 2, forming a sealed space between the battery cell 2 and the first sealing cavity 3. The vacuum assembly also includes a first air pump and a first suction pipe 5. The first suction pipe 5 is connected to the sealed space formed between the battery cell 2 and the first sealing cavity 3. The first air pump draws air to reduce the pressure in the sealed space. A pressure gauge is fixed to the first suction pipe 5. The pressure gauge displays the pressure in the sealed space formed between the battery cell 2 and the first sealing cavity 3. If the pressure remains unchanged or the pressure drop is within the allowable range within a specified time, the battery cell 2 is deemed qualified and proceeds to the next process.

[0023] One arrangement of the battery cells 2 is that multiple rows of battery cells 2 are arranged in parallel on the cup holder 1, and each battery cell 2 group includes multiple battery cells 2. The first sealed cavity 3 is also multiple and is arranged one-to-one with the battery cells 2 on the cup holder 1. For example, the battery cells 2 are arranged in 4X2, 6X3 or other arrangements.

[0024] The lifting assembly drives the first sealing cavity 3 to move up and down. The first lifting assembly includes a connecting rod, one end of which is fixedly connected to the vacuum assembly, and the other end of which is connected to a linear sliding pair. The linear sliding pair can be any common device in the art, such as a pneumatic cylinder, hydraulic cylinder, or electric cylinder. The vacuum assembly includes a sealing frame 4, with multiple first sealing cavities 3 having lower openings and being sealed to the lower part of the sealing frame 4. The sealing frame 4 has air holes corresponding to each first sealing cavity 3, connecting the first air pump and the first sealing cavity 3. The connecting rod is fixedly connected to the sealing frame 4.

[0025] In one embodiment of this utility model, a spring is provided inside the first sealing cavity 3. During the downward movement of the first sealing cavity 3, the spring is compressed. Through the elastic potential energy of the spring, when the first lifting assembly moves upward, the first sealing cavity 3 can be more easily separated from the battery cell 2. In another embodiment, one end of the spring is fixed to the upper part of the first sealing cavity 3. When the first sealing cavity 3 and the battery cell 2 are nested and sealed together, the other end of the spring abuts against the upper part of the battery cell 2, and at this time the spring is in a compressed state. In one embodiment of this utility model, to facilitate easy separation of the first sealing cavity 3 and the battery cell 2, the first air pump is selected as a pump that can both pump and inflate. When it is necessary to separate the first sealing cavity 3 from the battery cell 2, the first air pump inflates, and the gas enters the sealed space between the first sealing cavity 3 and the battery cell 2 through the first suction pipe 5, making it easier to separate the first sealing cavity 3 from the battery cell 2.

[0026] An embodiment of this utility model also provides a leak detection line for battery cell 2, including a frame and a conveyor belt. A cup holder 1 can be fixed to the conveyor belt and moves with the conveyor belt. A first lifting component is fixed to the upper part of the frame and located above the conveyor belt. The cup holder 1 moves to the lower part of the first lifting component. The first lifting component drives the first sealing cavity 3 to move downward to nest and seal the battery cell 2. A first air pump draws air to reduce the pressure in the sealed space formed between the battery cell 2 and the first sealing cavity 3. Pressure is maintained for a specified time. If the pressure remains unchanged or the pressure drop is within the allowable range within the specified time, the battery cell 2 is determined to be a qualified product and continues to be conveyed backward along the conveyor line. An RGA gas leak detection component is set behind the first lifting component along the forward direction of the conveyor belt. The battery cell 2 moves to the RGA gas detection station for RGA gas detection. The RGA gas leak detection assembly also includes an RGA gas analyzer and a second sealing chamber that can be sealed to the battery cell 2. The second sealing chamber is moved up and down by a second lifting assembly, which has the same structure as the first lifting assembly. The second sealing chamber is nested and sealed with the lower battery cell 2. The second sealing chamber is sealed to a second air pump through a second exhaust pipe. When the second air pump draws air, the pressure in the sealed space between the battery cell 2 and the second sealing chamber decreases. If there is a leak in the battery cell 2, the electrolyte components inside the battery cell 2 will precipitate into the sealed space between the battery cell 2 and the second sealing chamber, and enter the RGA gas analyzer through the second exhaust pipe. If the battery cell 2 has no leak, the RGA gas analyzer test result is negative, and the battery cell 2 is collected or proceeds to the next process. If the battery cell 2 has a leak, the RGA gas analyzer test result is positive, and the battery cell 2 is determined to be unqualified and is discarded.

[0027] First, a large leak is detected by using the first lifting assembly in conjunction with the vacuum assembly. Then, an RGA gas leak is detected by using the second lifting assembly in conjunction with the second sealed cavity. Compared with direct RGA gas leak detection, this method avoids electrolyte contamination of the RGA detection cavity and improves detection accuracy and efficiency.

[0028] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention.

Claims

1. A battery cell leak detection device, characterized in that, include: Cup holder, with multiple battery cells fixed on it; A vacuum assembly is located on the upper part of the cup holder. The vacuum assembly includes multiple first sealed cavities. Each first sealed cavity can move downward to nest a sealed battery cell. The first sealed cavity is connected to a first air pump for vacuuming through a first air pumping pipe. A pressure gauge for measuring the pressure inside the first sealed cavity is fixed in the first air pumping pipe. The first lifting component is fixedly connected to the vacuum component and can drive the first sealed cavity to move up and down.

2. The cell leak detection device as described in claim 1, characterized in that, The cup holder has multiple rows of parallel battery cell groups arranged on it, each battery cell group including multiple batteries. There are also multiple first sealed cavities, which are set one-to-one with the batteries on the cup holder.

3. The cell leak detection device as described in claim 2, characterized in that, The vacuum assembly includes a sealing frame, multiple first sealing cavities with lower openings and sealed connections to the lower part of the sealing frame, and air holes connecting the first air pump and the first sealing cavity are provided on the sealing frame at locations corresponding to each first sealing cavity; the first lifting assembly is fixedly connected to the sealing frame.

4. The cell leak detection device as described in claim 3, characterized in that, The first lifting assembly includes a connecting rod, one end of which is fixedly connected to the sealing frame, and the other end of which is connected to a linear sliding pair.

5. The cell leak detection device as described in claim 1, characterized in that, A spring is installed inside the first sealed cavity, and the spring is compressed as the first sealed cavity moves downward.

6. A cell leak detection production line, characterized in that, The device includes a cell leak detection device as described in any one of claims 1-5, and further includes a frame and a conveyor belt. The cup holder can be fixed to the conveyor belt and moves with the conveyor belt. The first lifting component is fixed to the upper part of the frame and located above the conveyor belt. An RGA gas leak detection component is provided behind the first lifting component along the forward direction of the conveyor belt.

7. A cell leak detection production line as described in claim 6, characterized in that, The RGA gas leak detection assembly includes a second sealed cavity that can be sealed to the battery cell. The RGA gas leak detection assembly also includes an RGA gas analyzer. The second sealed cavity is sealed to a second gas pump through a second gas extraction pipeline. The second sealed cavity and the RGA gas analyzer are connected through the second gas extraction pipeline.

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