Gasket assembly

Abstract

The utility model discloses a gasket assembly which comprises a first gasket, and first connecting pieces are arranged on the two sides of the first gasket respectively. The number of the second gaskets is at least one pair, each first gasket can be clamped between the pair of second gaskets, each second gasket is provided with a second connecting piece and an arc surface, and the second connecting pieces are detachably connected with the first connecting pieces, so that the first gaskets and the second gaskets are connected to be in a first use state or detached to be in a second use state; and the arc surfaces are attached to the two sides of the battery in the first use state. The first gasket and the second gasket can be connected or detached through the first connecting piece and the second connecting piece, so that the first gasket and the at least one pair of second gaskets can be flexibly combined according to the shape of the battery cell, the whole gasket assembly can be compatible with the battery cells in different shapes, and the application range is wide.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production technical field especially relates to a gasket assembly. BACKGROUND

[0002] Formation is the key link of battery forming, can activate the active material in the battery, form SEI film, to ensure that the battery has good charge and discharge performance and cycle life, and keeps good appearance.

[0003] At present, in the formation process of the battery cell, the conventional method is to use a solid gasket with a certain thickness and hardness, which is placed on both sides or one side of the battery cell, and then the pressure is applied to it through the formation equipment, but when facing the formation operation of the winding structure battery cell, due to the edge of the winding structure battery cell is arc-shaped, in the pressure formation process, the pressure is difficult to be evenly distributed, the edge of the battery cell bears smaller pressure, and uneven pressure will cause poor bonding effect between the pole pieces, with the cycle use of the battery, the poor bonding area is easy to appear lithium precipitation phenomenon, which seriously affects the battery performance, which not only limits the application range of the gasket, but also has negative impact on the quality and production efficiency of the battery cell. SUMMARY

[0004] In order to overcome at least one of the defects of the prior art, the utility model provides a gasket assembly, the first gasket and the second gasket can be flexibly combined according to the specification of the battery cell, so as to be suitable for the formation of battery cells with different structures, and the application range is wide.

[0005] The utility model discloses a technical scheme adopted to solve the problem:

[0006] A gasket assembly comprises:

[0007] The first gasket is provided with a first connecting piece on both sides;

[0008] The second gasket is provided with at least one pair, each first gasket can be clamped between a pair of second gaskets, each second gasket is provided with a second connecting piece and an arc surface, the second connecting piece and the first connecting piece can be detachably connected, so that the first gasket and the second gasket are connected in the first use state or separated in the second use state; the arc surface is used for being attached to both sides of the battery in the first use state.

[0009] Further, the first connecting piece and the second connecting piece are snap connected.

[0010] Furthermore, the first connector is a snap-fit ​​block disposed on both sides of the first gasket, and the second connector is a snap-fit ​​groove disposed on the second gasket. The snap-fit ​​block and the snap-fit ​​groove are disposed opposite to each other and snap-fit ​​connected.

[0011] Furthermore, the snap-fit ​​block includes a snap-fit ​​arm and a snap-fit ​​connector. The snap-fit ​​connector is used to slide and engage with the inner wall of the slot when the snap-fit ​​arm is snapped into the slot, and to abut against the inner wall of the slot.

[0012] Furthermore, the connector is provided with a guide slope, which slides with the inner wall of the slot and is pressed by the inner wall of the slot to guide the connector to engage or disengage from the slot.

[0013] Furthermore, the first gasket has guide arc surfaces on both sides, which are used to connect with the arc surfaces after the first gasket and the second gasket are connected.

[0014] Furthermore, the first gasket is provided in a plurality of parts, each of which has a different size.

[0015] Furthermore, multiple pairs of second gaskets are provided, and the curvature value of the arc surface on the second gasket is R. The R value of the arc surface on the two second gaskets in each pair is the same, and the R value of the arc surface on each pair of second gaskets is different.

[0016] Furthermore, both the first gasket and the second gasket are made of elastic material.

[0017] Furthermore, the first gasket and the second gasket are made of foamed silicone or polyurethane.

[0018] In summary, the gasket assembly provided by this utility model has the following technical effects:

[0019] The first and second gaskets can be connected or detached via the first and second connectors to achieve two usage states. When forming a wound battery cell, the first and second connectors are connected, placing the first and second gaskets in the first usage state. In this state, the first gasket fits tightly against the flat surface of the battery cell, while the arc surface of the second gasket fits against the arc positions on both sides of the battery cell. This ensures that the pressure applied by the equipment during the battery cell formation process is evenly transmitted to the outer periphery of the battery cell, effectively improving the problem of uneven pressure distribution. When forming a square battery cell, the first and second gaskets are detached, placing the gasket assembly in the second usage state. In this state, a suitable first gasket is selected and attached to the surface of the battery cell, allowing the entire gasket assembly to accommodate battery cells of different shapes and specifications, making it more flexible and applicable to a wider range of applications. Attached Figure Description

[0020] Fig. 1 This is a schematic diagram of the structure of this utility model;

[0021] Fig. 2 This is an exploded view of the structure of one specification of this utility model;

[0022] Fig. 3 This is an exploded view of another specification of the present invention;

[0023] The meanings of the reference numerals in the attached figures are as follows:

[0024] 10. First gasket; 11. First connector; 20. Second gasket; 21. Arc surface; 22. Second connector. Detailed Implementation

[0025] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0028] See Figs. 1 to 3 This utility model discloses a gasket assembly, including a first gasket 10 and a second gasket 20. First connectors 11 are respectively provided on both sides of the first gasket 10. At least one pair of second gaskets 20 are provided, and each first gasket 10 can be clamped between two second gaskets 20. Each second gasket 20 is provided with a second connector 22 and an arc surface 21. The second connector 22 is detachably connected to the first connector 11 so that the first gasket 10 and the second gasket 20 are connected in a first use state or detached in a second use state. The arc surface 21 is in contact with both sides of the battery in the first use state.

[0029] Based on the above structure, in specific configuration, the first pad 10 can be provided with a flat surface pad so that it can be directly attached to the flat part of the cell, which is suitable for forming square cells with flat surfaces. Each second pad 20 is provided with an arc surface 21, which is suitable for forming cells with arc-shaped sides. This allows the pad assembly to be flexibly combined according to the shape of the cell, so as to be suitable for forming cells with different structures.

[0030] Specifically, during the formation of a wound battery cell, a first pad 10 can be clamped between two second pads 20 and connected to a second connector 22 via a first connector 11. At this time, the pad assembly is in its first usage state. In this state, the flat first pad 10 is connected to the middle of two second pads 20 with arc surfaces 21, and the flat first pad 10 is attached to the flat part of the battery cell. The arc surfaces 21 on the second pads 20 are attached to the arc positions on both sides of the battery cell. Thus, during the formation process, the first pad 10 is pressed and transmitted to the edge, transferring the pressure to the second pads 20 on both sides. Then, the pressure is transmitted through the second pads 20 to the arc surfaces 21, and then through the arc surfaces 21 to the arc parts at the edge of the battery cell. This ensures that the entire outer periphery of the battery cell, including the arc parts at the edge, is evenly subjected to pressure, making the force on each part of the battery cell balanced and effectively improving the problem of uneven external pressure distribution during the formation process.

[0031] In addition, when forming square cells, since square cells usually have a regular planar structure, unlike wound cells which have rounded parts on both sides that require special pads for fitting, it is only necessary to separate the first pad 10 and the second pad 20 to make the pad assembly in a second use state. In this state, only the flat surface of the first pad 10 is needed to fit well onto the surface of the cell and achieve functions such as pressure transmission. The rounded surface 21 of the second pad 20 is not needed for adaptation, which simplifies the structure of the entire pad assembly.

[0032] Therefore, when using the gasket assembly in this embodiment, since the first gasket 10 and the second gasket 20 can be connected or detached from the first connector and the second connector to present two usage states, it can be used for both the formation of square batteries and the formation of wound batteries, making it flexible in use and with a wide range of applications.

[0033] It should be noted that the first gasket 10 and the second gasket 20 can be cut according to the commonly used square cells and wound cells on the market, and at least one pair of second gaskets 20 should be prepared so that the gasket assembly can be widely adapted to cells of different manufacturers and models, ensuring good adhesion and stability between the gasket assembly and the cell, and ensuring the formation effect and cell quality. In addition, during the battery production process, when it is necessary to perform formation operations on cells of different specifications, since the corresponding specifications of the second gaskets 20 have been prepared in advance, the staff can quickly select and replace them without waiting for the production of custom gaskets or making complex adjustments, which greatly shortens the production preparation time, improves production efficiency, and is conducive to achieving large-scale, high-efficiency battery production.

[0034] More specifically, in this embodiment, the first connector 11 can be a buckle or a latch on both sides of the first gasket 10, and the second connector 22 can be a slot or latch on the second gasket 20 that matches the latch or latch. The first connector 11 and the second connector 22 are snapped together. When disassembling, a certain external force is applied by hand or tool to make the first connector 11 elastically deform, so that it snaps into or disengages from the second connector 22, thereby realizing the quick separation of the first gasket 10 and the second gasket 20.

[0035] In addition, the first connector 11 can also be the napped side of the hook and loop fastener on the first pad 10. The napped side is composed of many fine fibers and is soft in texture, which can be tightly bonded to the hook side of the hook and loop fastener. The second connector 22 is the hook side of the hook and loop fastener on the second pad 20. The hook side is composed of many small hook-like structures. These hooks can grab the fibers of the napped side to achieve the connection between the two. When disassembling, you only need to hold the first pad 10 and the second pad 20 by hand and pull them gently in opposite directions. The hook side of the hook and loop fastener will separate from the napped side. The operation is simple and quick and can achieve rapid disassembly.

[0036] Of course, the first connector 11 can also be a permanent magnet (such as neodymium iron boron or other strong magnetic materials) mounted on the first pad 10 to provide sufficient attraction; while the second connector 22 is a magnetic material or soft magnetic material (iron, nickel, cobalt or other metal materials or their alloys) that can attract the permanent magnet and is mounted on the second pad 20. Similarly, the two can be quickly separated by applying a certain external force by hand or tool.

[0037] In another embodiment, the first connector 11 may be a threaded connector (such as a screw or bolt) provided on the first washer 10, and the second connector 22 may be a threaded hole provided on the second washer 20. The two are threaded together to achieve a detachable connection through threaded connection.

[0038] Furthermore, in this embodiment, both the first gasket 10 and the second gasket 20 can be made of existing materials such as polyurethane, foamed silicone, or polyoxymethylene (POM), which have a certain degree of elasticity and hardness. This allows the entire gasket assembly to undergo a certain degree of elastic deformation when subjected to external force, thereby enabling it to fit well with the surface of the battery cell to a certain extent, while also having good rigidity and dimensional stability. This allows the first gasket 10 and the second gasket 20 to maintain the stability of their shape and structure during free combination, making them less prone to deformation or damage and easier to operate and use.

[0039] Preferably, in this embodiment, the first connector 11 and the second connector 22 are engaged. In this case, the first connector 11 can be a buckle, a block, or a hook on the first gasket 10, while the second connector 22 is a matching slot or groove on the second gasket 20. Of course, the first connector 11 can be a slot or groove on the first gasket 10, while the second connector 22 can be a buckle, a block, or a hook on the second gasket 20, and both can achieve an engaging connection.

[0040] Compared to threaded connections, snap-fit ​​connections eliminate the need for rotation and screwing. Simply align the two parts and snap them together to complete the connection, significantly saving installation time and improving assembly efficiency. Compared to magnetic or Velcro connections, snap-fit ​​connections, through specific mechanical structures such as the engagement of slots and blocks, provide higher connection strength and can withstand greater tensile, compressive, and shear forces. Even under complex conditions such as vibration and impact, the connection remains stable and is less prone to loosening or detachment, making the connection between the first gasket 10 and the second gasket 20 more stable.

[0041] Preferably, in this embodiment, the first connector 11 is a snap-fit ​​block provided on both sides of the first gasket 10, and the second connector 22 is a slot provided on the second gasket 20. The snap-fit ​​block and the slot are arranged opposite to each other. When the first gasket 10 and the second gasket 20 need to be used together, the snap-fit ​​block can be snapped into the slot so that the first gasket 10 and the second gasket 20 can be quickly assembled and disassembled.

[0042] Furthermore, the snap-fit ​​block includes a snap-fit ​​arm and a snap-fit ​​connector. When the snap-fit ​​arm snaps into the slot, the snap-fit ​​connector slides against the inner wall of the slot and abuts against the inner wall of the slot.

[0043] Specifically, when the snap-fit ​​arm approaches the slot, the snap-fit ​​connector contacts the slot first. Its shape and position can guide the snap-fit ​​arm to accurately enter the slot, reducing deviations and misoperations during the snap-fit ​​process, making the snap-fit ​​process smoother, and improving installation efficiency and accuracy.

[0044] Furthermore, because the snap-fit ​​connector abuts against the inner wall of the slot to ensure a tight fit, it effectively prevents the snap-fit ​​block from shaking or loosening within the slot. Thus, even when subjected to external forces such as vibration or impact during equipment operation, the snap-fit ​​connector can limit the displacement of the snap-fit ​​block through its interaction with the inner wall of the slot, ensuring the reliability of the connection and reducing the risk of equipment failure or damage due to loose connection.

[0045] It should be noted that the snap-fit ​​connector in this embodiment has a barb or protrusion structure on the snap-fit ​​arm. In this way, when the snap-fit ​​connector is inserted into the snap-fit ​​slot, the barb or protrusion is deformed by pressure and enters the snap-fit ​​slot. After it is in place, it returns to its original shape and hooks onto the inner wall of the snap-fit ​​slot, so that the snap-fit ​​connector can only enter in the insertion direction and is difficult to come out in the reverse direction. When it is necessary to remove it from the snap-fit ​​slot, only external force needs to be applied again. At this time, the snap-fit ​​connector is deformed again by the pressure of the inner wall of the snap-fit ​​slot, so as to detach from the snap-fit ​​slot.

[0046] Preferably, the snap-fit ​​connector in this embodiment can be made of materials with a certain elastic stress, such as polyamide (PA), polyoxymethylene (POM), or polyurethane, so that it can deform more easily and snap into or out of the slot after being subjected to force.

[0047] Furthermore, the connector is provided with a guide slope, which slides in conjunction with the inner wall of the slot and is pressed against the inner wall of the slot to guide the connector to engage or disengage from the slot.

[0048] Specifically, when the connector contacts the slot, the guide ramp first contacts the inner wall of the slot. Due to the presence of the ramp, during the snap-fit ​​process, the force exerted by the connector on the inner wall of the slot will generate a component force that makes it easier for the connector to enter the slot, thereby effectively reducing the resistance during insertion. This makes the snap-fit ​​operation easier, and it can be completed more smoothly whether it is done manually or by mechanical equipment.

[0049] It should be noted that in this embodiment, setting the guide slope to an arc surface can achieve the same effect.

[0050] Furthermore, guide arc surfaces are provided on both sides of the first gasket 10, and the guide arc surfaces connect with the arc surface 21 when the first gasket 10 and the second gasket 20 are connected.

[0051] Specifically, if the first gasket 10 does not have a guiding arc surface, when the first gasket 10 and the second gasket 20 are connected, since the plane and the arc surface 21 are directly connected, the transition between the two different shapes of the surfaces may not be smooth enough, and stress concentration may occur at the connection point, which may have an adverse effect on the surface of the battery cell during the formation process. Therefore, in this embodiment, guiding arc surfaces are provided on both sides of the first gasket 10 and the guiding arc surfaces are set close to the arc surface 21. In this way, when the first gasket 10 and the second gasket 20 are connected, the guiding arc surface can connect with the arc surface 21 on the second gasket 20 in a more natural and smoother manner, better fit the outer circumferential curve of the battery cell, reduce the gap caused by shape mismatch, and achieve a tighter wrapping. This allows the gasket assembly to distribute the formation pressure more evenly when wrapping the battery cell, reduce the adverse effect of local stress concentration on the battery cell, and further improve the protection of the battery cell.

[0052] It should be noted that the guide arc surface can be cut according to the arc surface 21 on the second gasket 20 so that the two can be smoothly connected.

[0053] Furthermore, there are several first gaskets 10, each with a different size.

[0054] Since each first gasket 10 has a different size (length or width), when the size of the battery cell changes, only the first gasket 10 of different specifications needs to be replaced and reconnected with the two second gaskets 20 to adapt to the different specifications of the battery cell. In this way, only the first gasket 10 needs to be replaced, without replacing the entire gasket assembly. The operation is simple and quick, reducing equipment downtime caused by replacing gaskets and improving production efficiency. At the same time, the same set of second gaskets 20 can be used with a variety of first gaskets 10 of different specifications. One set of gaskets can be used for the formation of battery cells of various sizes. There is no need to equip a complete set of gaskets for each battery cell size separately, which greatly expands the application range of the gasket assembly and improves the versatility and flexibility of the equipment.

[0055] Similarly, by preparing first pads 10 in various specifications, it is possible to cope with the changes in the size of various square cells, without having to design and manufacture a complete assembly including first pads 10 and second pads 20 for each square cell, thereby improving the versatility of the entire assembly in square cell formation scenarios.

[0056] It should be noted that the first pad 10 can also be cut according to the commonly used square battery cells and wound battery cells on the market, so that it can be widely adapted to battery cells of different manufacturers and different models.

[0057] Furthermore, the second gasket 20 is provided in multiple pairs, and the arc value of the arc surface 21 on the second gasket 20 is R. The arc surface 21 on the two second gaskets 20 in each pair has the same R value, and the arc surface 21 on each pair of second gaskets 20 has a different R value.

[0058] Specifically, in practical applications, the diameter or curvature of each wound cell varies during the winding process due to different design requirements and specifications. Therefore, in this example, multiple pairs of second pads 20 are set, and the R value of the arc surface 21 on each pair of second pads 20 is different, so that each pair of second pads 20 can be used in combination with different first pads 10, thereby adapting to cells with different winding radii. The second pads 20 with different R values ​​can fit tightly with cells of various curvatures, so that the pad assembly can adapt to a variety of wound cell structures with different winding radii, sizes and shapes when in the second use state, greatly expanding the range of applicable cells.

[0059] It should be noted that the curvature value of the arc surface 21 of the second pad 20 can be set according to the shape of the arc of various specifications of wound battery cells commonly used in the market. Multiple sets can be made at the same time, so that the needs of various battery cells can be met by combining multiple sets of second pads 20 with different R values ​​with different first pads 10. In this way, when different specifications of battery cells need to be formed, since the corresponding specifications of second pads 20 have been prepared in advance, the staff can quickly select and replace them without waiting for the production of custom pads or making complex adjustments, which greatly shortens the production preparation time and improves production efficiency.

[0060] Furthermore, both the first gasket 10 and the second gasket 20 are made of elastic materials, such as silicone, polyurethane, or rubber, which have a certain elastic stress. This allows the gasket assembly to fit tightly against the surface of the cell, whether it is a standard cylindrical, square, or irregular shape. This ensures that the pressure applied during the formation process is evenly distributed on the surface of the cell, thus improving the problem of uneven surface stress during the cell formation process.

[0061] Preferably, the second gasket 20 and the first gasket 10 are made of foamed silicone or polyurethane. Foamed silicone and polyurethane have good softness and elasticity, as well as a certain degree of hardness, so that the entire gasket assembly can produce a certain degree of elastic deformation when subjected to external force, thereby making it able to fit well with the surface of the battery cell to a certain extent. This allows the gasket assembly to fit battery cells of various shapes and sizes extremely well after being compressed, especially for some battery cells with complex surface curvature or special requirements, it can make better contact with them, thereby transferring the pressure to the surface of the battery cell more evenly and improving the battery cell formation effect.

[0062] In addition, due to its certain hardness, the first gasket 10 and the second gasket 20 can maintain the stability of their shape and structure during free combination, and are not prone to deformation or damage, making them easy to operate and use; at the same time, they are not prone to aging or cracking during long-term use, and can maintain the performance of the gasket for a long time, ensuring the reliability of the gasket throughout the entire production and use cycle of the battery cell.

[0063] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A gasket assembly, characterized in that, include: A first gasket, wherein a first connector is provided on each of the two sides of the first gasket; The second gasket has at least one pair, and each of the first gaskets can be clamped between a pair of second gaskets. Each of the second gaskets has a second connector and an arc surface. The second connector is detachably connected to the first connector so that the first gasket and the second gasket are connected in a first use state or detached in a second use state. The arc surface is used to fit against both sides of the battery in the first use state.

2. The gasket assembly as claimed in claim 1, characterized in that, The first connector and the second connector engage and connect.

3. The gasket assembly as described in claim 2, characterized in that, The first connector is a snap-fit ​​block disposed on both sides of the first gasket, and the second connector is a snap-fit ​​groove disposed on the second gasket. The snap-fit ​​block and the snap-fit ​​groove are disposed opposite to each other and snap-fit ​​connected.

4. The gasket assembly as claimed in claim 3, characterized in that, The snap-fit ​​block includes a snap-fit ​​arm and a snap-fit ​​connector. The snap-fit ​​connector is used to slide and engage with the inner wall of the slot when the snap-fit ​​arm is snapped into the slot, and to abut against the inner wall of the slot.

5. The gasket assembly as claimed in claim 4, characterized in that, The connector is provided with a guide slope, which slides with the inner wall of the slot and is pressed by the inner wall of the slot to guide the connector to engage or disengage from the slot.

6. The gasket assembly as claimed in claim 1, characterized in that, The first gasket has guide arc surfaces on both sides, which are used to connect with the arc surfaces after the first gasket and the second gasket are connected.

7. The gasket assembly according to any one of claims 1-6, characterized in that, The first gasket is provided in several parts, and each first gasket has a different size.

8. The gasket assembly as claimed in claim 7, characterized in that, The second gasket is provided in multiple pairs. The arc value of the arc surface on the second gasket is R. The arc surface of the two second gaskets in each pair has the same R value, and the arc surface of each pair of second gaskets has a different R value.

9. The gasket assembly according to any one of claims 1-6, characterized in that, Both the first gasket and the second gasket are made of elastic material.

10. The gasket assembly as claimed in claim 9, characterized in that, The first gasket and the second gasket are made of foamed silicone or polyurethane.

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