Novel battery cell leak detection sealing device
By designing a cell leak detection and sealing device with a retractable inflatable expansion section and a highly elastic spring, the problems of large size, high cost and low efficiency of existing equipment have been solved, and rapid and effective cell sealing detection has been achieved.
Patent Information
- Application Number
- CN202520398054.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-07
AI Technical Summary
Existing lithium-ion cell sealing testing equipment is large in size, expensive, time-consuming to vacuum, and has low production efficiency, making it difficult to achieve rapid and effective sealing testing.
A novel battery cell leak detection and sealing device was designed, which adopts a retractable inflatable expansion section and a highly elastic spring structure to achieve rapid sealing and detachment, reduce equipment size and vacuuming time, adapt to different shell deformations, and improve detection efficiency.
It enables rapid sealing and leak detection of battery cells, reduces equipment costs and production cycle time, and improves testing efficiency and sealing performance. Battery cells can be tested on the logistics line without needing to be picked up and put into the sealing cavity.
Smart Images
Figure CN223925937U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a novel electric core leak detection sealing device belongs to electric core leak detection technical field. BACKGROUND
[0002] Lithium ion battery has excellent energy density and power density, is widely used in new energy automobile, energy storage, consumer electronics and other fields. With the continuous expansion of people's demand for lithium ion battery, various battery manufacturers are constantly expanding production capacity, and the sealing safety of lithium ion battery process is also concerned, which promotes major lithium battery production equipment suppliers to actively develop various battery sealing detection equipment.
[0003] The existing lithium ion battery assembly adopts laser welding, which is prone to problems such as burst point and broken welding, and various battery manufacturers use helium detector to detect the sealing of the battery. The whole battery is grabbed into the detection cavity by a mechanical hand. The current detection cavity is usually divided into upper and lower cavities. The battery is placed in the lower cavity, and the upper cavity is lowered to close, so that the whole battery is sealed in the sealed cavity for helium detection. However, there are the following problems. When detecting, the whole battery needs to be placed in the sealed cavity, which has large equipment volume and high use cost. The sealed cavity has high sealing requirements, and the vacuum extraction takes a long time. In addition, the battery needs to be grabbed from the logistics line to the sealed cavity, which reduces the production efficiency and rhythm. Therefore, it is necessary to develop a novel electric core leak detection sealing device. UTILITY MODEL CONTENTS
[0004] In view of the deficiencies in the prior art, the utility model provides a novel electric core leak detection sealing device.
[0005] The technical scheme for solving the above technical problems is as follows:
[0006] A novel electric core leak detection sealing device, comprising a cavity shell, a detection cavity is arranged inside the cavity shell, first and second inflation parts are arranged on the two side walls, an elastic element is fixedly arranged at the top end inside the cavity shell, a cavity outer through hole is arranged at the upper end, and a helium detector and an air source are connected to the cavity outer through hole.
[0007] Further, the first inflation part or the second inflation part is made of a telescopic material.
[0008] Further, the first inflation part or the second inflation part is an inflation sealing ring or an air bag.
[0009] Further, the initial state of the first inflation part or the second inflation part is protruding from the inner end surface of the cavity shell side wall and in contact with the battery.
[0010] Further, the elastic element comprises a first elastic element and a second elastic element.
[0011] Further, the first elastic element and the second elastic element are symmetrically arranged at the inner top end of the cavity shell.
[0012] Further, the first elastic element or the second elastic element is a high-elasticity spring.
[0013] Further, the initial length of the high-elasticity spring without elastic deformation is greater than the vertical distance from the inner top end of the cavity shell to the lower end face of the first inflatable expansion part or the second inflatable expansion part.
[0014] Further, the cavity shell is in the shape of a cylinder adapted to a cylindrical battery or a rectangle adapted to a square battery.
[0015] Further, the cavity shell is provided with grooves on both sides, and the first inflatable expansion part and the second inflatable expansion part are arranged in the grooves.
[0016] Compared with the prior art, the utility model has the beneficial effects that: a novel battery cell leak detection sealing cavity is provided, the sealing of the detection cavity is quickly realized, and the quick leak detection of square battery cells or cylindrical battery cells is realized, the utility model has a small volume, a very short vacuum extraction time, and a high detection efficiency, the entire battery cell does not need to be taken from the logistics line and placed in the sealing detection cavity, only the battery cell needs to be blocked on the logistics line, the cavity is lowered, and the position to be detected is located in the sealing detection cavity after the cavity is inflated and sealed, the small detection cavity volume reduces the manufacturing cost of the helium detection equipment and reduces the influence on the production rhythm.
[0017] The specific part of the battery cell can be sealed, the tight fit of the first inflatable expansion part and the second inflatable expansion part can cope with the deformation of the shell to make the cavity sealing better, the first elastic element and the second elastic element of the high-elasticity spring are arranged at the inner top of the cavity shell, the battery cell after detection is freely dropped under the reaction force of the spring, the battery cell is prevented from being taken away, the use effect is good, the quick sealing leak detection of the battery cell in the movement process of the logistics line is realized, and the working efficiency is high. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a structural schematic view of the utility model.
[0019] In the drawings, 1 is a cavity shell, 2 is a first inflatable expansion part, 3 is a second inflatable expansion part, 4 is a first elastic element, 5 is a second elastic element, 6 is a cavity outer through hole, and 7 is a detection cavity. DETAILED DESCRIPTION
[0020] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and are not used to limit the range of the utility model.
[0021] As Figure 1As shown, the novel battery cell leak detection and sealing device of this embodiment includes a cavity shell 1, a detection cavity 7 is provided inside the cavity shell 1, a first inflation expansion part 2 and a second inflation expansion part 3 are provided on the two side walls, an elastic element is fixedly provided at the top of the cavity shell 1, and an external through hole 6 is provided at the upper end of the cavity shell 1. A helium detector and a gas source are connected to the external through hole 6.
[0022] The first inflatable part 2 or the second inflatable part 3 is made of a stretchable material.
[0023] The first inflation expansion part 2 or the second inflation expansion part 3 is an inflation sealing ring or an airbag.
[0024] In the initial state, the first inflation expansion part 2 or the second inflation expansion part 3 both protrude from the inner end face of the side wall of the cavity shell 1 and are in contact with the battery cell.
[0025] The elastic element includes a first elastic element 4 and a second elastic element 5.
[0026] The first elastic element 4 and the second elastic element 5 are symmetrically arranged at the top of the cavity shell 1.
[0027] The first elastic element 4 or the second elastic element 5 is a highly elastic spring.
[0028] The initial length of the high-elasticity spring before elastic deformation is greater than the vertical distance from the top of the inner cavity shell 1 to the lower end face of the first inflation part 2 or the second inflation part 3.
[0029] The cavity shell 1 is cylindrical in shape to fit a cylindrical battery or rectangular in shape to fit a prismatic battery.
[0030] The outer shell 1 of the cavity is provided with grooves on both sides, and the first inflation expansion part 2 and the second inflation expansion part 3 are both provided in the grooves.
[0031] During operation, the first inflation expansion part 2 and the second inflation expansion part 3 are either airbags or inflatable sealing rings. An external through hole 6 is drilled at the top of the outer shell 1 to connect to an external helium detector and gas source. Grooves are drilled on both side walls of the outer shell 1 to install the first inflation expansion part 2 and the second inflation expansion part 3. The first inflation expansion part 2 and the second inflation expansion part 3 initially protrude from the inner wall of the outer shell 1. The outer shell 1 is installed at a suitable position on the logistics line to block the battery cell. The cavity descends, and after the outer shell 1 is pressed down, the first inflation expansion part 2 or the second inflation expansion part 3 is tightly attached to the outer shell of the battery cell to be tested. After inflation, the first inflation expansion part 2 or the second inflation expansion part 3 completely seals the shell. At this time, the battery cell to be tested is located inside the testing cavity 7. After the cavity 7 is evacuated, a helium detector is used to start the leak detection process. The inner wall of the top of the cavity shell 1 is equipped with a first elastic element 4 and a second elastic element 5. Both the first elastic element 4 and the second elastic element 5 are high elastic springs. The original length of the spring before elastic deformation is longer than the vertical distance from the inner top wall of the cavity shell 1 to the lower edge of the first inflation expansion part 2 or the second inflation expansion part 3. After the leak detection is completed, the first inflation expansion part 2 or the second inflation expansion part 3 is deflated, and the cavity shell 1 rises. Since the first inflation expansion part 2 or the second inflation expansion part 3 is in close contact with the battery cell to be tested in its original state, the rise of the cavity shell 1 will take away the battery cell. At this time, the compressed first elastic element 4 and the second elastic element 5 will cause the battery cell to fall off under the reaction of the spring.
[0032] A novel cell leak detection sealing cavity is provided, which enables rapid leak detection of prismatic or cylindrical cells by quickly sealing the detection cavity 7. It features a small size, extremely short vacuuming time, and high detection efficiency. It eliminates the need to pick up the entire cell from the logistics line and place it into the sealed detection cavity 7; simply blocking the cell on the logistics line allows the cavity to descend, inflate, and seal, ensuring the area to be tested is within the sealed detection cavity 7. The smaller volume of the detection cavity 7 reduces the manufacturing cost of the helium detection equipment and minimizes the impact on production cycle time. It can achieve partial sealing of the cell; the tightly fitted first inflation expansion part 2 and second inflation expansion part 3 can accommodate certain shell deformations, improving the cavity's sealing performance. The first elastic element 4 and second elastic element 5 of a high-elasticity spring are located at the top inside the cavity shell 1, allowing the tested cell to freely detach under the spring's reaction force, preventing the cell from being carried away. This results in good performance and achieves rapid sealing and leak detection of the cell during its movement on the logistics line, with high working efficiency.
[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A novel battery cell leak detection and sealing device, comprising a cavity shell (1), characterized in that: The cavity shell (1) has a detection cavity (7) inside, and a first inflation expansion part (2) and a second inflation expansion part (3) on both side walls. An elastic element is fixedly provided at the top of the cavity shell (1), and an external cavity through hole (6) is provided at the top. A helium detector and a gas source are connected to the external cavity through hole (6).
2. The novel cell leak detection and sealing device according to claim 1, characterized in that: The first inflatable expansion part (2) or the second inflatable expansion part (3) is made of a stretchable material.
3. The novel cell leak detection and sealing device according to claim 2, characterized in that: The first inflation expansion part (2) or the second inflation expansion part (3) is an inflation sealing ring or an airbag.
4. The novel cell leak detection and sealing device according to claim 1 or 2, characterized in that: In the initial state, the first inflation expansion part (2) or the second inflation expansion part (3) both protrude from the inner end face of the side wall of the cavity shell (1) and are in contact with the battery cell.
5. The novel cell leak detection and sealing device according to claim 1 or 2, characterized in that: The elastic element includes a first elastic element (4) and a second elastic element (5).
6. The novel cell leak detection and sealing device according to claim 5, characterized in that: The first elastic element (4) and the second elastic element (5) are symmetrically disposed at the top of the cavity shell (1).
7. The novel cell leak detection and sealing device according to claim 5, characterized in that: The first elastic element (4) or the second elastic element (5) is a highly elastic spring.
8. The novel cell leak detection and sealing device according to claim 7, characterized in that: The initial length of the high-elasticity spring before elastic deformation is greater than the vertical distance from the top of the inner part of the cavity shell (1) to the lower end face of the first inflation part (2) or the second inflation part (3).
9. The novel cell leak detection and sealing device according to claim 1, characterized in that: The cavity shell (1) is cylindrical in shape to fit a cylindrical battery or rectangular in shape to fit a square battery.
10. The novel cell leak detection and sealing device according to claim 1, characterized in that: The outer shell (1) of the cavity is provided with grooves on both sides, and the first inflation expansion part (2) and the second inflation expansion part (3) are both provided in the grooves.