Device for reducing deformation of blade battery cells during helium detection

Abstract

This utility model belongs to the field of lithium-ion battery technology, specifically relating to a device for reducing the deformation of blade battery cells during helium testing. It includes: a bottom positioning structure for supporting the blade battery cell; a battery cell body positioning structure disposed on the bottom positioning structure for accommodating and positioning the blade battery cell, the battery cell body positioning structure being configured to avoid the weld seam area surrounding the blade battery cell and to limit the main body portion of the blade battery cell; and a clamping mechanism connected to the battery cell body positioning structure for applying an adjustable clamping force to the battery cell body positioning structure, thereby pressing the blade battery cell body located therein. This utility model, by setting a dedicated battery cell body positioning structure and an adjustable clamping mechanism, effectively avoids the weld seam excess around the blade battery cell, thereby achieving direct and uniform pressing of the battery cell body portion.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to a device for reducing the deformation of blade battery cells during helium detection. Background Technology

[0002] During the production of blade battery cells, the perimeter of the casing is typically welded to form a sealed structure. After welding, a weld seam excess is formed on the cell surface, creating a height difference between the cell body and the weld seam area. During helium leak testing, due to the presence of the weld seam excess, traditional helium leak testing fixtures have difficulty effectively avoiding the weld seam area, resulting in a gap between the fixture and the cell casing, and failing to achieve uniform and effective clamping of the cell body.

[0003] In the prior art, such as the patent with publication number CN221077958U, a blade battery casing helium testing fixture is proposed. It reduces helium consumption by setting a first fixture and a second fixture to form a sealed space with the inner and outer sides of the battery casing, respectively. However, this structure has not been optimized for clamping the battery cell body and avoiding weld seams, and there is still a problem that the battery cell will be locally deformed due to the internal and external pressure difference during the helium testing process.

[0004] Another patent, CN110091269A, provides a battery helium detection clamping mechanism. By setting a push block and an elastic element to control the sealing pressure of the helium injection port, it can prevent battery deformation to a certain extent. However, its clamping mechanism still cannot effectively adapt to the weld structure of the blade cell, making it difficult to achieve comprehensive positioning and shaping protection of the cell body.

[0005] In addition, most existing helium testing fixtures adopt a fixed clamping structure with non-adjustable clamping force, which cannot adapt to cells of different thicknesses or with weld excess height. This causes the cells to easily undergo breathing deformation during helium testing, affecting the dimensional stability of the cells and product quality. Utility Model Content

[0006] The purpose of this invention is to provide a device for reducing the deformation of blade battery cells during helium testing, which can effectively avoid weld excess height, has adjustable clamping force, and effectively shape and protect the battery cell body.

[0007] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a device for reducing the deformation of blade battery cells during helium detection, comprising: Bottom positioning structure for supporting blade cells; A cell body positioning structure, disposed on the bottom positioning structure, is used to accommodate and position the blade cell. This cell body positioning structure is configured to avoid the peripheral weld area of ​​the blade cell and to limit its main body portion; and A clamping mechanism, connected to the cell body positioning structure, is used to apply an adjustable clamping force to the cell body positioning structure, thereby pressing the blade cell body located therein.

[0008] Preferably, the bottom positioning structure includes a pad and a gasket disposed on the pad, the gasket being made of a non-metallic material and used for direct contact with the blade cell housing.

[0009] Preferably, the non-metallic material is an engineering plastic or rubber.

[0010] Preferably, the cell body positioning structure includes: The support base is fixed to the bottom positioning structure; The first connecting plate and the second connecting plate are arranged opposite to each other and parallel to each other, and are vertically positioned by positioning slots opened on the support base; and At least one partition, the length of which is less than the length of the blade cell to avoid the surrounding weld seam, the two ends of which are respectively connected to the inner sides of the first connecting plate and the second connecting plate.

[0011] Preferably, the cell body positioning structure further includes a stop block, which is fixed to one end of the first connecting plate and the second connecting plate, and is used to axially limit the blade cell.

[0012] Preferably, the clamping mechanism includes: The first clamping plate and the second clamping plate are respectively disposed on the outer side of the first connecting plate and the second connecting plate; A drive assembly, connected to the first clamping plate and / or the second clamping plate, is used to drive the first clamping plate and the second clamping plate to move towards or away from each other, thereby clamping or releasing the battery cell body positioning structure.

[0013] Preferably, the driving component includes: The clamping block and the connecting block are fixed to the second clamping plate; The latching claws are respectively set on the clamping block and the connecting block; A double-spring hook and loop fastener has its base connected to the first clamping plate, and its fastening portion can selectively engage with the hook claw to provide adjustable clamping force.

[0014] Preferably, the second clamping plate is fixedly connected to the second connecting plate.

[0015] Preferably, the clamping force provided by the clamping mechanism is adjustable, enabling the device to shape the large surface of the blade cell during helium detection to limit its thickness deformation caused by the breathing effect.

[0016] Preferably, the partition is connected to the first connecting plate and the second connecting plate by recessed bolts.

[0017] The beneficial effects of this utility model are as follows: By setting up a special positioning structure for the main body of the battery cell and an adjustable clamping mechanism, this utility model effectively avoids the weld excess height around the blade battery cell, thereby achieving direct and uniform clamping of the main body of the battery cell. This design not only eliminates the problem of insufficient clamping caused by weld gaps, but also its adjustable clamping force can play a good shaping and limiting role on the large surface of the battery cell during helium testing, significantly suppressing deformation in the thickness direction, thereby greatly reducing the risk of battery cell deformation, ensuring product dimensional stability and quality, while also being simple in structure and convenient in operation. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a partially enlarged view of the present invention; Figure 3 This is an enlarged view of the partition plate of this utility model; Figure 4 This is a perspective view of the present invention from another direction; The attached diagram is described below: 1. First clamping plate; 2. Second clamping plate; 3. Clamping block; 4. Support base; 5. Stop block; 6. Connecting block; 7. First connecting plate; 8. Pad plate; 9. Gasket; 10. Second connecting plate; 11. Partition plate; 12. Double spring buckle; 13. Snap hook. Detailed Implementation

[0019] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

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

[0023] The present invention provides a device for reducing the deformation of blade battery cells during helium detection, which mainly consists of three parts: a bottom positioning structure, a battery cell main body positioning structure, and a clamping mechanism.

[0024] The bottom positioning structure mainly consists of a pad 8 and a gasket 9. The pad 8 serves as the base of the entire fixture and is fixed to the worktable of the helium detection equipment by bolts or other means. The gasket 9 is preferably made of non-metallic engineering plastics such as polyurethane or nylon, or rubber, and is fixed to the upper surface of the pad 8 by adhesive bonding or embedding. Its function is to directly contact the lower surface of the blade cell housing, providing stable support and effectively preventing scratches on the smooth housing surface of the cell during operation.

[0025] The cell body positioning structure is the core for achieving weld seam avoidance and cell body positioning. It mainly includes a support base 4, a first connecting plate 7, a second connecting plate 10, a partition plate 11, and a stop block 5. The support base 4 is fixedly installed on the pad plate 8, which has a precise positioning groove machined on it. The first connecting plate 7 and the second connecting plate 10 are arranged parallel to each other, with their bottoms embedded in the positioning grooves of the support base 4 and fastened with bolts to ensure that they are vertical, aligned, and have a stable distance. These two connecting plates constitute the two main surfaces for clamping the cell body.

[0026] The length L1 of the separator 11 is designed to be less than the length L of the battery cell body (usually the battery cell length minus the width of the welds on both sides). Multiple separators 11 are fixedly connected to the inner sides of the first connecting plate 7 and the second connecting plate 10 respectively by countersunk bolts. This design ensures that when the battery cell is inserted, only the flat main body of the battery cell contacts the separator 11, while the raised peripheral weld area is completely avoided, preventing gaps caused by the welds pressing against the tooling.

[0027] The stop block 5 is connected to one end of the support base 4 via a slot, and is used to limit the inserted battery cell axially (i.e. in the length direction) to prevent it from moving during the testing process.

[0028] The clamping mechanism provides adjustable clamping force and mainly includes a first clamping plate 1, a second clamping plate 2, a clamping block 3, a connecting block 6, a double-spring latch 12, and a snap hook 13. The second clamping plate 2 is fixedly connected to the second connecting plate 10 by bolts. The clamping block 3 and the connecting block 6 are fixedly installed on the second clamping plate 2. The snap hook 13 is fixedly installed on the clamping block 3 and the connecting block 6, respectively. The first clamping plate 1 is positioned on the outer side corresponding to the first connecting plate 7. The base (or base portion) of the double-spring latch 12 is fixedly installed on the first clamping plate 1, and its movable latch arm (or fastening part) can open and close freely.

[0029] The working process of this utility model device is as follows: Before operation, open the double spring latch 12 to separate the first clamp 1 from the second clamp 2. At this time, the distance between the first connecting plate 7 and the second connecting plate 10 is greater than the thickness of the blade cell.

[0030] The blade battery cell, with its perimeter welded, is placed laterally into the space between the first connecting plate 7 and the second connecting plate 10. During placement, one end of the battery cell with the liquid injection hole should face the connecting block 6 to facilitate subsequent docking with the helium injection nozzle of the helium detection equipment; the other end of the battery cell (the cover plate end) should contact the stop block 5 to complete axial positioning.

[0031] The movable arms of the double-spring latch 12 are respectively fastened into the latch claws 13 on the clamping block 3 and the connecting block 6. By fastening the double-spring latch 12, the first clamping plate 1 is driven to move towards the second clamping plate 2, thereby pressing the first connecting plate 7 and the second connecting plate 10. Finally, the connecting plate is evenly pressed onto the main surface of the battery cell through the partition 11, achieving the shaping and fixing of the battery cell. The elasticity provided by the double-spring latch 12 itself is the adjustable clamping force.

[0032] The assembled battery cell and tooling are pushed into the testing chamber of the helium testing equipment for assembly. The helium injection nozzle of the helium testing equipment extends from one side of the connecting block 6, aligns with the injection hole of the battery cell, and is pressed tightly to seal it. Then, the airtightness test begins.

[0033] During helium testing, the battery cell tends to "breathe" due to the internal and external pressure difference. At this time, the first connecting plate 7 and the second connecting plate 10, which are closely attached to the large surface of the battery cell, play a rigid limiting role, which significantly suppresses the deformation of the battery cell in the thickness direction, thereby ensuring the dimensional stability of the battery cell.

[0034] After the test is completed, open the double spring latch 12 to easily remove the battery cell.

[0035] The device described in this embodiment, through the combined design of "partition plate to avoid weld seam" and "spring snap adjustable clamping", precisely solves the problem of uneven clamping and deformation of blade cells caused by weld seam interference during helium testing. It has a simple structure, is easy to operate, and has significant effects.

[0036] For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A device for reducing deformation of blade battery cells, characterized in that, include: Bottom positioning structure for supporting blade cells; A cell body positioning structure, disposed on the bottom positioning structure, is used to accommodate and position the blade cell. This cell body positioning structure is configured to avoid the peripheral weld area of ​​the blade cell and to limit its main body portion; and A clamping mechanism, connected to the cell body positioning structure, is used to apply an adjustable clamping force to the cell body positioning structure, thereby pressing the blade cell body located therein.

2. The device for reducing the deformation of blade battery cells according to claim 1, characterized in that, The bottom positioning structure includes a pad (8) and a gasket (9) disposed on the pad (8), the gasket (9) being made of a non-metallic material and used for direct contact with the blade cell housing.

3. The device for reducing the deformation of blade battery cells according to claim 2, characterized in that, The non-metallic material is engineering plastic or rubber.

4. The device for reducing the deformation of blade battery cells according to claim 1, characterized in that, The battery cell body positioning structure includes: The support base (4) is fixed on the bottom positioning structure; The first connecting plate (7) and the second connecting plate (10) are arranged opposite to each other and parallel to each other, and are vertically positioned by the positioning groove opened on the support base (4); and At least one partition (11) is provided, the length of which is less than the length of the blade cell to avoid the surrounding weld seam, and the two ends of the partition (11) are respectively connected to the inner sides of the first connecting plate (7) and the second connecting plate (10).

5. The device for reducing the deformation of blade battery cells according to claim 4, characterized in that, The battery cell main body positioning structure also includes a stop (5), which is fixed to one end of the first connecting plate (7) and the second connecting plate (10) for axial positioning of the blade battery cell.

6. The device for reducing the deformation of blade battery cells according to claim 4, characterized in that, The clamping mechanism includes: The first clamping plate (1) and the second clamping plate (2) are respectively disposed on the outer side of the first connecting plate (7) and the second connecting plate (10); A drive assembly, connected to the first clamping plate (1) and / or the second clamping plate (2), is used to drive the first clamping plate (1) and the second clamping plate (2) to move towards or away from each other, thereby clamping or releasing the battery cell body positioning structure.

7. The device for reducing the deformation of blade battery cells according to claim 6, characterized in that, The driving component includes: The clamping block (3) and the connecting block (6) are fixed on the second clamping plate (2); The snap hooks (13) are respectively set on the clamping block (3) and the connecting block (6); A double spring latch (12) is connected at its base to the first clamp (1), and its fastening part can selectively engage with the latch claw (13) to provide an adjustable clamping force.

8. The apparatus for reducing the deformation of blade battery cells according to claim 7, characterized in that, The second clamping plate (2) is fixedly connected to the second connecting plate (10).

9. The device for reducing the deformation of blade battery cells according to claim 1, characterized in that, The clamping force provided by the clamping mechanism is adjustable, enabling the device to shape the large surface of the blade cell during helium detection, thereby limiting its thickness deformation caused by the breathing effect.

10. The device for reducing the deformation of blade battery cells according to claim 4, characterized in that, The partition (11) is connected to the first connecting plate (7) and the second connecting plate (10) by recessed bolts.

Images