Pouch-type lithium ion battery corner sealing device

Abstract

The utility model relates to the field of lithium ion battery packaging provides a kind of soft package lithium ion battery corner sealing device.The corner sealing device includes packaging pedestal, corner sealing part and positioning part, corner sealing part includes the first surface towards positioning part, the part of first surface is recessed and forms head groove towards the direction away from positioning part, head groove includes first groove wall and second groove wall, first groove wall and second groove wall are perpendicular, and the connecting position of first groove wall and second groove wall is fillet transition;The part of positioning part side surface away from working surface is recessed and forms locating groove, in the direction of positioning part towards corner sealing part, locating groove penetrates positioning part, locating groove includes first opening, third groove wall and fourth groove wall close to corner sealing part, third groove wall and fourth groove wall are perpendicular, in the direction of positioning part towards corner sealing part, the distance of third groove wall and fourth groove wall reduces.According to the corner sealing device provided in the application, it can be suitable for different specifications of soft package lithium ion battery, and the versatility of the corner sealing device is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery packaging, and in particular to a corner sealing device for soft-pack lithium-ion batteries. Background Technology

[0002] Soft-pack lithium-ion batteries generally use aluminum-plastic film to package the battery cells. During the production process, the aluminum-plastic film needs to be side-sealed and corner-sealed. Corner sealing helps to increase the load-bearing capacity of the aluminum-plastic film corners and prevent deformation, bending and damage of the aluminum-plastic film corners during battery manufacturing and transportation, thereby avoiding the problem of leakage due to corner damage.

[0003] However, existing corner sealing devices are generally specialized devices, meaning that the corner sealing device needs to be selected or adjusted according to the specifications of the soft-pack lithium-ion battery so that its size can meet the corner sealing requirements of the current specifications of soft-pack lithium-ion batteries.

[0004] It is clear from this that the existing corner sealing devices have poor versatility and cannot meet the corner sealing size requirements of different specifications of soft-pack lithium-ion batteries. Utility Model Content

[0005] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this utility model provides a corner sealing device for soft-pack lithium-ion batteries.

[0006] This application provides a corner sealing device for a soft-pack lithium-ion battery, comprising: a packaging base having a working surface; a corner sealing portion and a positioning portion, both disposed on the working surface; the corner sealing portion includes a first surface facing the positioning portion, a portion of the first surface being recessed in a direction away from the positioning portion to form a sealing groove; the sealing groove includes a first groove wall and a second groove wall opposite to the positioning portion, the plane containing the first groove wall and the plane containing the second groove wall being perpendicular, the first groove wall and the second groove wall being connected, and the connection position between the first groove wall and the second groove wall being... The corners are rounded for transition; the portion of the positioning part facing away from the working surface is recessed to form a positioning groove. In the direction of the positioning part toward the corner seal, the positioning groove penetrates the positioning part. The positioning groove includes a first opening near the corner seal, a third groove wall and a fourth groove wall both connected to the first opening. The plane where the third groove wall is located is perpendicular to the plane where the fourth groove wall is located. In the direction of the positioning part toward the corner seal, the distance between the third groove wall and the fourth groove wall decreases. The third groove wall is coplanar with the first groove wall, and the fourth groove wall is coplanar with the second groove wall.

[0007] In this way, when the operator performs corner sealing on the soft-pack lithium-ion battery, the battery is first placed in the positioning groove of the positioning part, with the corner to be sealed facing the first opening. Then, the battery is pushed towards the corner sealing part along the third and fourth groove walls until the battery abuts against both the third and fourth groove walls, and the corner to be sealed abuts against both the first and second groove walls. The corner seal encapsulates the corner to be sealed. The rounded transition between the first and second groove walls, i.e., the rounded corner setting between the first and second groove walls, can reduce damage to the aluminum-plastic film of the battery during the corner sealing process and improve the corner sealing effect.

[0008] Simply change the position of the battery at other corners.

[0009] It can be understood that by setting the positioning part, the size of the first opening is determined, and the size of the corners of the rectangular batteries extending from the first opening is consistent. That is, the size of the corners of rectangular batteries of different specifications extending from the first opening is consistent, and they can all be corner sealed by the corner sealing part. Therefore, the corner sealing device for soft-pack lithium-ion batteries provided in this embodiment can meet the corner sealing requirements of soft-pack lithium-ion batteries of different specifications, thereby improving the versatility of the corner sealing device.

[0010] Furthermore, by setting up a positioning part, the stability of the battery position during the corner sealing process can be improved, ensuring the processing accuracy during the packaging process.

[0011] In one possible implementation of this application, the corner sealing device for a soft-pack lithium-ion battery further includes: a gasket, the gasket being adapted to the bottom surface of the positioning groove, and the gasket being detachably connected to the bottom surface of the positioning groove.

[0012] In one possible implementation of this application, the bottom surface of the end cap groove is coplanar with the bottom surface of the positioning groove.

[0013] In one possible implementation of this application, the first surface includes a first sub-surface connected to the first groove wall, and the first groove wall and the first sub-surface are circularly transitioned.

[0014] In one possible implementation of this application, the first surface includes a second sub-surface connected to the second groove wall, and the second groove wall and the second sub-surface are circularly transitioned.

[0015] In one possible implementation of this application, the corner sealing device for a soft-pack lithium-ion battery further includes a corner sealing fixing part, wherein the corner sealing part is detachably connected to the packaging base via the corner sealing fixing part.

[0016] In one possible implementation of this application, the corner sealing device for a soft-pack lithium-ion battery further includes: a plurality of fastening bolts; the corner sealing fixing part is provided with a plurality of first bolt through holes, the encapsulation base is provided with a plurality of second bolt through holes, the plurality of first bolt through holes, the plurality of second bolt through holes and the plurality of fastening bolts correspond one-to-one, and the fastening bolts pass through the first bolt through holes and the second bolt through holes.

[0017] In one possible implementation of this application, the first bolt through hole is formed as a waist-shaped hole.

[0018] In one possible implementation of this application, the gasket is a foam layer or a Teflon layer.

[0019] In one possible implementation of this application, the end cap groove extends through the side surface of the corner seal opposite to the encapsulation base. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the corner sealing device for a soft-pack lithium-ion battery according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the operation of the corner sealing device for soft-pack lithium-ion batteries described herein;

[0024] Figure 3 for Figure 1 A schematic diagram of the corner seal and the corner seal fixing part shown in the figure;

[0025] Figure 4 for Figure 3 A schematic diagram of another angle of the corner seal and the corner seal fixing part shown;

[0026] Figure 5 for Figure 3 A schematic diagram of another angle of the corner seal and the corner seal fixing part shown;

[0027] Figure 6 for Figure 1 A schematic diagram of the positioning part shown;

[0028] Figure 7 for Figure 6 A schematic diagram of the positioning part from another angle;

[0029] Figure 8 for Figure 6 A schematic diagram of the positioning part at another angle shown;

[0030] Figure 9 This is a schematic diagram of the corner sealing portion and corner sealing fixing portion provided in other embodiments of this application.

[0031] Figure label:

[0032] 100. Corner sealing device; 111. Working surface; 120. Corner sealing part; 121. Head groove; 122. First groove wall; 123. Second groove wall; 124. First sub-face; 125. Second sub-face; 126. First outer surface; 127. Second outer surface; 130. Positioning part; 131. First opening; 132. Third groove wall; 133. Fourth groove wall; 134. Positioning groove; 140. Corner sealing fixing part; 141. First bolt through hole;

[0033] 200. Battery. Detailed Implementation

[0034] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments of this utility model and the features thereof can be combined with each other.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0036] Soft-pack lithium-ion batteries generally use aluminum-plastic film to package the battery cells. During the production process, the aluminum-plastic film needs to be side-sealed and corner-sealed. Corner sealing helps to increase the load-bearing capacity of the aluminum-plastic film corners and prevent deformation, bending and damage of the aluminum-plastic film corners during battery manufacturing and transportation, thereby avoiding the problem of leakage due to corner damage.

[0037] However, existing corner sealing devices are generally specialized devices, meaning that the corner sealing device needs to be selected or adjusted according to the specifications of the soft-pack lithium-ion battery so that its size can meet the corner sealing requirements of the current specifications of soft-pack lithium-ion batteries.

[0038] It is clear from this that the existing corner sealing devices have poor versatility and cannot meet the corner sealing size requirements of different specifications of soft-pack lithium-ion batteries.

[0039] To solve the above technical problems, please refer to Figure 1 and Figure 2 This application provides a corner sealing device 100 for a soft-pack lithium-ion battery, which may include a packaging base, a corner sealing part 120 and a positioning part 130.

[0040] It can be understood that the packaging base is an operating platform or operating substrate for the 200-corner sealing operation of soft-pack lithium-ion batteries. The packaging base is provided with a working surface 111, which provides an operating reference surface for the 200-corner sealing operation of soft-pack lithium-ion batteries.

[0041] Both the corner sealing part 120 and the positioning part 130 are provided on the working surface 111.

[0042] Specifically, a corner seal fixing part 140 is provided between the corner seal part 120 and the working surface 111, and the corner seal part 120 is detachably connected to the packaging base through the corner seal fixing part 140.

[0043] For further details, please refer to Figures 3 to 5 The corner seal fixing part 140 is fixedly connected to the packaging base by multiple fastening bolts. The corner seal fixing part 140 is provided with multiple first bolt through holes 141, and the packaging base is provided with multiple second bolt through holes. The multiple first bolt through holes 141, multiple second bolt through holes and multiple fastening bolts correspond one-to-one, and the fastening bolts pass through the first bolt through holes 141 and the second bolt through holes.

[0044] Thus, the corner seal fixing part 140 is fixed to the packaging base by fastening bolts, the corner seal part 120 can be fixed on the corner seal fixing part 140, and the corner seal part 120 can also be integrally formed with the corner seal fixing part 140.

[0045] Furthermore, the first bolt through hole 141 can be formed as an oblong hole. By setting the first bolt through hole 141 as an oblong hole, on the one hand, the relative position between the corner seal fixing part 140 and the packaging base can be adjusted, which facilitates assembly and disassembly and improves adaptability and versatility. On the other hand, the shape of the oblong hole allows the force to be distributed more evenly around the hole when subjected to external force, avoiding potential damage caused by stress concentration.

[0046] In the specific implementation process, the corner sealing fixing part 140 is formed into a rectangular block shape, and the four corners of the corner sealing fixing part 140 are provided with first bolt through holes 141. The corner sealing part 120 is fixedly installed on the side surface of the corner sealing fixing part 140 away from the packaging base.

[0047] The corner seal 120 can heat-encapsulate the corner of the soft-pack lithium-ion battery 200. The corner seal 120 includes a first surface facing the positioning part 130. A portion of the first surface is recessed in a direction away from the positioning part 130 to form a sealing groove 121. The sealing groove 121 includes a first groove wall 122 and a second groove wall 123 opposite to the positioning part 130. The plane containing the first groove wall 122 is perpendicular to the plane containing the second groove wall 123. The first groove wall 122 and the second groove wall 123 are connected, and the connection position between the first groove wall 122 and the second groove wall 123 is rounded. The first groove wall 122 and the second groove wall 123 being opposite to the positioning part 130 means that, taking the direction of the corner seal 120 towards the positioning part 130 as the first direction, the first direction intersects with the first groove wall 122 and the second groove wall 123.

[0048] Please see Figures 6 to 8 The positioning part 130 is recessed on the side of the working surface 111 to form a positioning groove 134. In the direction of the positioning part 130 toward the corner seal 120, the positioning groove 134 penetrates the positioning part 130. The positioning groove 134 includes a first opening 131 near the corner seal 120, a third groove wall 132 and a fourth groove wall 133 both connected to the first opening 131. The plane where the third groove wall 132 is located is perpendicular to the plane where the fourth groove wall 133 is located. In the direction of the positioning part 130 toward the corner seal 120, the distance between the third groove wall 132 and the fourth groove wall 133 decreases.

[0049] The third groove wall 132 is coplanar with the first groove wall 122, and the fourth groove wall 133 is coplanar with the second groove wall 123.

[0050] In this way, when the operator performs corner sealing on the soft-pack lithium-ion battery 200, the battery 200 is first placed in the positioning groove 134 of the positioning part 130, with the corner to be sealed facing the first opening 131. Then, along the third groove wall 132 and the fourth groove wall 133, the battery 200 is pushed towards the corner sealing part 120 until the battery 200 abuts against both the third groove wall 132 and the fourth groove wall 133, and the corner to be sealed against both the first groove wall 122 and the second groove wall 123. The corner seal encapsulates the corner to be sealed of the battery 200. The rounded transition between the first groove wall 122 and the second groove wall 123, i.e., the rounded corner between the first groove wall 122 and the second groove wall 123, can reduce damage to the aluminum-plastic film of the battery 200 during the corner sealing process and improve the corner sealing effect.

[0051] Simply change the position of the other corners of the battery 200.

[0052] It can be understood that by setting the positioning part 130, when the size of the first opening 131 is determined, the corner size of the rectangular battery 200 extending from the first opening 131 is consistent. That is, the corner size of rectangular batteries 200 of different specifications extending from the first opening 131 is consistent, and they can all be corner sealed by the corner sealing part 120. Therefore, the soft-pack lithium-ion battery corner sealing device 100 provided in this embodiment can meet the corner sealing requirements of soft-pack lithium-ion batteries 200 of different specifications, thereby improving the versatility of the corner sealing device 100.

[0053] Furthermore, by setting the positioning part 130, the stability of the battery 200 position during the corner sealing process can be improved, ensuring the processing accuracy during the packaging process.

[0054] The end cap groove 121 can penetrate the side surface of the corner seal 120 away from the packaging base. This can reduce the interference between the battery 200 and the packaging part, and at the same time, the corner seal of the battery 200 can be clearly observed.

[0055] In some embodiments of this application, the first surface includes a first sub-surface 124 connected to the first groove wall 122, and the first groove wall 122 and the first sub-surface 124 are rounded, that is, the connection position between the first groove wall 122 and the first sub-surface 124 is rounded.

[0056] Furthermore, the first surface includes a second sub-surface 125 connected to the second groove wall 123, and the second groove wall 123 and the second sub-surface 125 are rounded, that is, the connection position between the second groove wall 123 and the second sub-surface 125 is rounded.

[0057] It should be noted that during the process of the battery 200 moving toward the end cap groove 121, there is a possibility of hard collision between the connection position of the first groove wall 122 and the first sub-surface 124 and the connection position of the second groove wall 123 and the second sub-surface 125 and the battery 200. By making the first groove wall 122 and the first sub-surface 124 transition with an arc and the second groove wall 123 and the second sub-surface 125 transition with an arc, the battery 200 can be prevented from being damaged due to the collision.

[0058] In one embodiment of this application, the soft-pack lithium-ion battery corner sealing device 100 further includes a gasket that is adapted to the bottom surface of the positioning groove 134 and is detachably connected to the bottom surface of the positioning groove 134.

[0059] In this way, by setting shims of different heights, the height difference between the bottom wall of the positioning groove 134 and the bottom wall of the end cap groove 134 can be adjusted, thereby adapting to soft-pack lithium-ion batteries 200 of different thicknesses.

[0060] The gasket is either a foam layer or a Teflon layer.

[0061] It should be noted that, under normal circumstances, the thickness of the soft-pack lithium-ion battery 200 is 5mm to 12mm. In the specific design process, the depth of the positioning groove 134 can be set to 12mm. Taking the thickness of the pad as 1mm as an example, the actual depth of the positioning groove 134 can be adjusted by attaching different numbers of pads to adapt to soft-pack lithium-ion batteries 200 of different thicknesses.

[0062] In one embodiment of this application, the bottom surface of the end cap groove 121 is coplanar with the bottom surface of the positioning groove 134. Thus, when the corner-sealing position of the soft-pack lithium-ion battery 200 moves to the end cap groove 121, the first groove wall 122, the second groove wall 123, and the bottom surface of the end cap groove 121 limit the soft-pack lithium-ion battery 200 in three directions, ensuring the stability of the position of the lithium-ion soft-pack battery 200 during the corner sealing process, thereby ensuring the corner sealing effect.

[0063] In order to save on the volume and material cost of the corner seal 120, the corner seal 120 can be formed into an "L" shaped structure.

[0064] For further details, please refer to Figure 9 When the corner seal 120 is formed into an "L" shape, the corner seal 120 includes a first outer side 126 and a second outer side 127. The first outer side 126 is connected to the first sub-side 124, and the second outer side 127 is connected to the second sub-side 125. The first sub-side 124 and the first outer side 126 can be connected by an arc, and the second sub-side 125 and the second outer side 127 can be connected by an arc. In this way, the scratches between the battery cell and the corner seal 120 can be further avoided.

[0065] In this design, the first sub-surface 124 is directly connected to the first groove wall 122, eliminating the rounded transition; similarly, the second sub-surface 125 is directly connected to the second groove wall 123, eliminating the rounded transition. This ensures a larger contact area between the first and second groove walls 122 and the battery cell, guaranteeing the stable operation of the battery cell corner sealing process.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily 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 this utility model. Therefore, this utility model is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the utility model herein.

Claims

1. A corner sealing device for a soft-pack lithium-ion battery, characterized in that, include: Encapsulation base, wherein the encapsulation base is provided with a working surface; The corner sealing part and the positioning part are both provided on the working surface; The corner sealing portion includes a first surface facing the positioning portion, a portion of the first surface is recessed in a direction away from the positioning portion to form a sealing groove, the sealing groove includes a first groove wall and a second groove wall opposite to the positioning portion, the plane where the first groove wall is located is perpendicular to the plane where the second groove wall is located, the first groove wall and the second groove wall are connected, and the connection position of the first groove wall and the second groove wall is rounded. The positioning part is recessed on the side of the working surface to form a positioning groove. In the direction of the positioning part toward the corner seal, the positioning groove penetrates the positioning part. The positioning groove includes a first opening near the corner seal, a third groove wall and a fourth groove wall that are both connected to the first opening. The plane where the third groove wall is located is perpendicular to the plane where the fourth groove wall is located. In the direction of the positioning part toward the corner seal, the distance between the third groove wall and the fourth groove wall decreases. The third tank wall is coplanar with the first tank wall, and the fourth tank wall is coplanar with the second tank wall.

2. The corner sealing device for a soft-pack lithium-ion battery according to claim 1, characterized in that, Also includes: A gasket, which is adapted to the bottom surface of the positioning groove, and the gasket is detachably connected to the bottom surface of the positioning groove.

3. The corner sealing device for a soft-pack lithium-ion battery according to claim 1, characterized in that, The bottom surface of the end cap groove is coplanar with the bottom surface of the positioning groove.

4. The corner sealing device for a soft-pack lithium-ion battery according to claim 1, characterized in that, The first surface includes a first sub-surface connected to the first groove wall, and the first groove wall and the first sub-surface are circularly transitioned.

5. The corner sealing device for a soft-pack lithium-ion battery according to claim 4, characterized in that, The first surface includes a second sub-surface connected to the second groove wall, and the second groove wall and the second sub-surface are circularly transitioned.

6. The corner sealing device for a soft-pack lithium-ion battery according to claim 1, characterized in that, Also includes: The corner seal fixing part is detachably connected to the packaging base.

7. The corner sealing device for a soft-pack lithium-ion battery according to claim 6, characterized in that, Also includes: Multiple fastening bolts; The corner seal fixing part is provided with multiple first bolt through holes, and the encapsulation base is provided with multiple second bolt through holes. The multiple first bolt through holes, the multiple second bolt through holes and the multiple fastening bolts correspond one-to-one, and the fastening bolts pass through the first bolt through holes and the second bolt through holes.

8. The corner sealing device for a soft-pack lithium-ion battery according to claim 7, characterized in that, The first bolt through hole is formed into a waist-shaped hole.

9. The corner sealing device for a soft-pack lithium-ion battery according to claim 2, characterized in that, The gasket is a foam layer or a Teflon layer.

10. The corner sealing device for a soft-pack lithium-ion battery according to claim 1, characterized in that, The end cap groove penetrates the side surface of the corner seal that is away from the encapsulation base.

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