Tab limiting assembly

Abstract

The present disclosure relates to the field of battery cell processing, and provides a tab limiting assembly. The tab limiting assembly comprises a first clamping plate, a second clamping plate and a first limiting block; the first clamping plate and the second clamping plate are oppositely arranged, the first clamping plate comprises a first surface facing the second clamping plate, the second clamping plate comprises a second surface facing the first clamping plate, and a battery cell is clamped between the first surface and the second surface; the first limiting block is detachably arranged on the first surface of the first clamping plate, and the first limiting block is located between positive and negative tabs of the battery cell; after the battery cell enters a cavity and the first clamping plate and the second clamping plate clamp the battery cell, the positive and negative tabs abut against the first limiting block. The tab limiting assembly provided by the present disclosure can effectively improve the "inner eight" deformation problem of the tab.

Description

Technical Field

[0001] This disclosure relates to the field of battery cell processing technology, and in particular to a tab limiting component. Background Technology

[0002] In the degassing process, pouch lithium-ion cells require a high vacuum environment. During this process, gases generated during the formation and discharge of the cell are extracted, increasing the pressure difference between the inside and outside of the aluminum-plastic film. Under this vacuum, the aluminum-plastic film in the tab area of ​​a single-sided tab cell is prone to collapse inwards, causing the tab spacing to shrink (exhibiting an "inward" deformation), affecting the cell consistency in subsequent assembly processes. Existing technologies typically mitigate deformation by adjusting the vacuum level or extending the holding time, but these methods cannot fundamentally solve the tab displacement problem. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, the present invention provides a tab limiting component.

[0004] This application provides a tab limiting assembly, which includes: a first clamping plate and a second clamping plate opposite to each other, the first clamping plate including a first surface facing the second clamping plate, the second clamping plate including a second surface facing the first clamping plate, and a battery cell clamped between the first surface and the second surface; a first limiting block, the first limiting block being detachably disposed on the first surface of the first clamping plate, the first limiting block being located between the positive and negative tabs of the battery cell, when the battery cell enters the cavity, after the first clamping plate and the second clamping plate clamp the battery cell, the positive and negative tabs abut against the first limiting block.

[0005] According to the electrode tab limiting component provided in the embodiments of this application, by setting a first limiting block, the negative electrode tab will abut against the first limiting block during the process of tilting and deforming towards the positive electrode tab, thereby limiting the excessive tilting and deformation of the negative electrode tab. Similarly, during the process of tilting and deforming towards the negative electrode tab, the positive electrode tab will abut against the first limiting block, thereby limiting the excessive tilting and deformation of the positive electrode tab.

[0006] In this way, the tab limiting component provided in this application can improve the situation where the negative and positive tabs tilt during the vacuuming process of the battery cell, avoid excessive deformation of the negative tab towards the positive tab, and avoid excessive deformation of the positive tab towards the negative tab. By physically limiting the tabs, the stability of the distance between the positive and negative tabs under high vacuum conditions is maintained, effectively improving the problem of "inward" deformation of the tabs.

[0007] In one possible implementation of this application, the first limiting block includes a connected body segment and a guide segment. The body segment is disposed on the first surface, and the guide segment is connected to the side of the body segment away from the first surface. The width of the guide segment decreases in the direction from the first clamping plate to the second clamping plate. When the battery cell enters the cavity, after the first clamping plate and the second clamping plate clamp the battery cell, the positive and negative electrode tabs abut against the body segment.

[0008] In one possible implementation of this application, the distance between the first limiting block and the positive or negative electrode tab is less than or equal to 0.5 mm.

[0009] In one possible implementation of this application, the first limiting block has a first threaded blind hole on one side surface facing the first clamping plate, and the first clamping plate has a first threaded through hole; the pole tab limiting assembly further includes: a first bolt, which passes through the first threaded through hole and the first threaded blind hole, and is threadedly engaged with the first threaded through hole and the first threaded blind hole.

[0010] In one possible implementation of this application, the first threaded blind hole is a waist-shaped hole, and the length direction of the first threaded blind hole is consistent with the direction from the negative electrode tab to the positive electrode tab.

[0011] In one possible implementation of this application, the first limiting block includes a first side facing the negative electrode tab, and the first side is provided with a first buffer layer; and / or, the first limiting block includes a second side facing the positive electrode tab, and the second side is provided with a second buffer layer.

[0012] In one possible implementation of this application, the electrode limiting assembly further includes: a second limiting block, wherein the first limiting block is disposed on the first surface, and the second limiting block abuts against the negative electrode tab when the first clamping plate and the second clamping plate clamp the battery cell; and / or, a third limiting block, wherein the third limiting block is disposed on the first surface, and the third limiting block abuts against the positive electrode tab when the first clamping plate and the second clamping plate clamp the battery cell.

[0013] In one possible implementation of this application, the first limiting block, the second limiting block, and the third limiting block are integrally formed parts.

[0014] In one possible implementation of this application, the electrode limiting assembly further includes: a fourth limiting block disposed on the second surface, wherein when the first clamping plate and the second clamping plate clamp the battery cell, the fourth limiting block abuts against the negative electrode tab; and / or, a fifth limiting block disposed on the second surface, wherein when the first clamping plate and the second clamping plate clamp the battery cell, the fifth limiting block abuts against the positive electrode tab.

[0015] In one possible implementation of this application, the electrode limiting assembly further includes a connecting plate, one end of which is connected to the fourth limiting block and the other end of which is connected to the fifth limiting block. When the first clamping plate and the second clamping plate clamp the battery cell, the first limiting block abuts against the connecting plate. Attached Figure Description

[0016] 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.

[0017] 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.

[0018] Figure 1 A schematic diagram of a tab limiting assembly provided in some embodiments of this application;

[0019] Figure 2 for Figure 1 A schematic diagram of the electrode limiting assembly clamping the battery cell shown;

[0020] Figure 3 for Figure 1 The diagram shows the battery cell and the first limiting block.

[0021] Figure label:

[0022] 100. Electrode limiting assembly;

[0023] 110. First clamping plate; 111. First surface; 112. First limiting block; 1121. First threaded blind hole; 113. First threaded through hole; 115. Second limiting block; 114. Third limiting block; 120. Second clamping plate; 121. Second surface; 122. Fourth limiting block; 123. Fifth limiting block; 124. Connecting plate; 200. Battery cell; 210. Negative electrode tab; 220. Positive electrode tab. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] In the degassing process, pouch lithium-ion cells require a high vacuum environment. During this process, gases generated during the formation and discharge of the cell are extracted, increasing the pressure difference between the inside and outside of the aluminum-plastic film. Under this vacuum, the aluminum-plastic film in the tab area of ​​a single-sided tab cell is prone to collapse inwards, causing the tab spacing to shrink (exhibiting an "inward" deformation), affecting the cell consistency in subsequent assembly processes. Existing technologies typically mitigate deformation by adjusting the vacuum level or extending the holding time, but these methods cannot fundamentally solve the tab displacement problem.

[0027] To resolve the above technical issues, please refer to Figures 1 to 3 This application provides a tab limiting component 100. Specifically, the tab limiting component 100 is applied in the vacuuming process of the battery cell 200. The battery cell 200 is clamped by the tab limiting component 100 so that the battery cell 200 can be vacuumed in a high vacuum environment.

[0028] For details, please refer to Figure 1 and Figure 2 The electrode limiting assembly 100 may include a first clamping plate 110, a second clamping plate 120 and a first limiting block 112. The first clamping plate 110 and the second clamping plate 120 are disposed opposite to each other. The first clamping plate 110 includes a first surface 111 facing the second clamping plate 120, and the second clamping plate 120 includes a second surface 121 facing the first clamping plate 110. The battery cell 200 is clamped between the first surface 111 and the second surface 121.

[0029] It is understood that the first clamping plate 110 can move toward the second clamping plate 120, and the second clamping plate 120 can move toward the first clamping plate 110. The first clamping plate 110 and the second clamping plate 120 can be equipped with driving devices to realize the movement of the first clamping plate 110 and the second clamping plate 120, thereby realizing the clamping of the battery cell 200.

[0030] The first limiting block 112 is detachably disposed on the first surface 111 of the first clamping plate 110. Specifically, the side wall of the first limiting block 112 facing the first clamping plate 110 may be provided with a first threaded blind hole 1121. The first clamping plate 110 is provided with a first threaded through hole 113. The tab limiting assembly 100 also includes a first bolt, which passes through the first threaded through hole 113 and the first threaded blind hole 1121 and is threadedly engaged with the first threaded through hole 113 and the first threaded blind hole 1121 to realize the detachable connection between the first limiting block 112 and the first clamping plate 110.

[0031] The detachable connection between the first limiting block 112 and the first clamping plate 110 reduces the processing difficulty of the first clamping plate 110 and the first limiting block 112, and allows for separate repair and replacement of the first limiting block 112 and the first clamping plate 110 during subsequent maintenance.

[0032] Please see Figure 3 The first limiting block 112 is located between the positive and negative electrodes of the battery cell 200. The first limiting block 112 can be formed into a rectangular block. The first limiting block 112 includes a first side facing the negative electrode 210 and a second side facing the positive electrode 220. When the battery cell 200 enters the cavity, after the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the electrodes abut against the first limiting block 112. Specifically, during the vacuuming process of the battery cell 200, the negative electrode 210 will tilt and deform towards the positive electrode 220, and the positive electrode 220 will tilt and deform towards the negative electrode 210.

[0033] By setting the first limiting block 112, during the process of the negative electrode tab 210 tilting and deforming towards the positive electrode tab 220, it will abut against the first side of the first limiting block 112, limiting the negative electrode tab 210 from excessive tilting and deformation. During the process of the positive electrode tab 220 tilting and deforming towards the negative electrode tab 210, it will abut against the second side of the first limiting block 112, limiting the positive electrode tab 220 from excessive tilting and deformation.

[0034] In this way, the tab limiting component 100 provided in this application can improve the tilting of the negative tab 210 and the positive tab 220 during the vacuuming process of the cell 200, avoid excessive deformation of the negative tab 210 toward the positive tab 220, and avoid excessive deformation of the positive tab 220 toward the negative tab 210. By physically limiting the tab spacing, the stability of the tab spacing under high vacuum environment is maintained, effectively improving the problem of tab "inward" deformation.

[0035] In some embodiments of this application, the distance between the first limiting block 112 and the electrode tab is less than or equal to 0.5 mm.

[0036] Specifically, the distance between the negative electrode tab 210 and the first side is less than or equal to 0.5 mm, and the distance between the positive electrode tab 220 and the second side is less than or equal to 0.5 mm.

[0037] The distance between the first limiting block 112 and the electrode tab refers to the distance between the first limiting block 112 and the electrode tab before the battery cell 200 is evacuated.

[0038] In the specific implementation process, the distance between the negative electrode tab 210 and the first side can be 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm; the distance between the positive electrode tab 220 and the second side can be 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm.

[0039] It should be noted that in the prior art, after the battery cell 200 enters the cavity and is clamped by the first clamping plate 110 and the second clamping plate 120, the amount of contraction between the electrodes generally reaches 1.3mm.

[0040] The tab limiting assembly 100 provided in this application, on the one hand, can reduce the amount of contraction between the tabs after the battery cell 200 enters the cavity by controlling the distance between the first side and the negative tab 210 and the second side and the positive tab 220. Taking the first limiting block 112 with the distance between the first side and the negative tab 210 being 0.1mm and the distance between the second side and the positive tab 220 being 0.1mm as an example, the first limiting block 112 supports the deformation of the tabs and allows the battery cell 200 to enter the cavity. After the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the amount of contraction between the tabs is reduced to 0.2mm, which greatly improves the problem of the "inward" deformation of the tabs.

[0041] On the other hand, by setting a gap between the first limiting block 112 and the negative electrode tab 210 and the positive electrode tab 220, interference between the first limiting block 112 and the electrode tabs can be avoided when the first limiting block 112 is inserted between the two electrode tabs and pulled out between the two electrode tabs, thereby reducing the occurrence of electrode tab jamming.

[0042] In some embodiments of this application, please refer to Figure 3 In order to ensure the limiting effect of the first limiting block 112, the length of the first limiting block 112 in the direction from the fixed end of the electrode to the free end of the electrode is greater than 1 / 2 of the length of the electrode.

[0043] Specifically, the length of the first limiting block 112 in the direction from the fixed end of the electrode to the free end of the electrode is 2 / 3 or 3 / 4 of the length of the electrode.

[0044] Furthermore, the first limiting block 112 extends at least partially beyond the free end of the electrode.

[0045] In some embodiments of this application, a first buffer layer may be provided on the first side; a second buffer layer may also be provided on the second side.

[0046] The first buffer layer can be a rubber layer or a silicone layer, and the second buffer layer can also be a rubber layer or a silicone layer. In this way, by setting the first buffer layer and the second buffer layer, the situation of the electrode being scratched due to a hard collision when the electrode approaches and abuts against the first limiting block 112 can be avoided.

[0047] Understandably, based on the provision of a first buffer layer on the first side and a second buffer layer on the second side, it is necessary to ensure that, before the cell 200 is evacuated, the first buffer layer and the negative electrode tab 210 are in a gap fit, and the second buffer layer and the positive electrode tab 220 are in a gap fit.

[0048] In some embodiments of this application, the first limiting block 112 includes a connected body segment and a guide segment. The body segment is disposed on the first surface 111, and the guide segment is connected to the side of the body segment away from the first surface 111. In the direction from the first clamping plate 110 to the second clamping plate 120, the width of the guide segment decreases. When the battery cell 200 enters the cavity, after the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the electrode tab abuts against the body segment.

[0049] In this way, by setting a guide segment to guide the first limiting block 112 as it penetrates between the two electrodes, the situation of the first limiting block 112 scratching the electrodes during its penetration between the two electrodes is avoided.

[0050] In the specific processing, the edge of the first side facing the second clamping plate 120 can be chamfered, and the edge of the second side facing the second clamping plate 120 can be chamfered to form a guide section.

[0051] Please refer to some embodiments of this application. Figure 3 The first threaded blind hole 1121 is a waist-shaped hole, and the length direction of the first threaded blind hole 1121 is consistent with the direction of the negative electrode tab 210 toward the positive electrode tab 220.

[0052] In this way, during the assembly of the first limiting block 112 and the first clamping plate 110, the distance between the first limiting block 112 and the negative electrode tab 210 and the positive electrode tab 220 can be adjusted by adjusting the different positions of the first bolt corresponding to the first threaded blind hole 1121. This allows for fine-tuning of the distance between the first limiting block 112 and the tab during actual operation, thus meeting the actual distance requirements.

[0053] For example, when the distance between the first limiting block 112 and the negative electrode tab 210 is less than the distance between the first limiting block 112 and the positive electrode tab 220, the first limiting block 112 can be moved toward the positive electrode tab 220 by adjusting the mating position of the first bolt and the first threaded blind hole 1121, so that the distance between the first limiting block 112 and the negative electrode tab 210 and the positive electrode tab 220 is the same.

[0054] In some embodiments of this application, the electrode limiting assembly 100 further includes a second limiting block 115, and a first limiting block 112 is disposed on the first surface 111. When the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the second limiting block 115 abuts against the negative electrode tab 210.

[0055] Therefore, by setting the second limiting block 115 to limit the deformation of the negative electrode tab 210 toward the first clamping plate 110, the stability of the position of the negative electrode tab 210 is further guaranteed.

[0056] The second limiting block 115 may have a third buffer layer on the side facing the second clamping plate 120. The third buffer layer may be a rubber layer or a silicone layer to avoid hard collision between the second limiting block 115 and the negative electrode tab 210, which could cause scratches on the negative electrode tab 210.

[0057] Furthermore, the electrode limiting assembly 100 may also include a third limiting block 114, which is disposed on the first surface 111. When the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the third limiting block 114 abuts against the positive electrode tab 220.

[0058] Therefore, by setting the third limiting block 114 to limit the deformation of the positive electrode tab 220 toward the first clamping plate 110, the stability of the position of the positive electrode tab 220 is further guaranteed.

[0059] The third limiting block 114 may have a fourth buffer layer on the side facing the second clamping plate 120. The fourth buffer layer may be a rubber layer or a silicone layer to avoid the third limiting block 114 from being scratched by a hard collision with the positive electrode tab 220.

[0060] The first limiting block 112, the second limiting block 115 and the third limiting block 114 can be integrally formed parts.

[0061] Please refer to some embodiments of this application. Figure 1 and Figure 2The electrode limiting assembly 100 also includes a fourth limiting block 122, which is disposed on the second surface 121. When the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the fourth limiting block 122 abuts against the negative electrode tab 210.

[0062] Thus, by cooperating with the second limiting block 115 and the fourth limiting block 122, the position of the negative electrode tab 210 in the direction of the first clamping plate 110 toward the second clamping plate 120 is limited.

[0063] The fourth limiting block 122 may also be provided with a fifth buffer layer on the side surface facing the first clamping plate 110. The fifth buffer layer may be a rubber layer or a silicone layer to prevent the fourth limiting block 122 from scratching the negative electrode tab 210.

[0064] In the specific implementation process, the fourth limiting block 122 can be detachably connected to the second clamping plate 120, which can be achieved by bolts and threaded holes.

[0065] Furthermore, the electrode limiting assembly 100 may also include a fifth limiting block 123, which is disposed on the second surface 121. When the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the fifth limiting block 123 abuts against the positive electrode tab 220.

[0066] Thus, by cooperating with the fifth limiting block 123 and the third limiting block 114, the position of the positive electrode tab 220 in the direction of the first clamping plate 110 toward the second clamping plate 120 is limited.

[0067] The fifth limiting block 123 may also be provided with a sixth buffer layer on the side surface facing the first clamping plate 110. The sixth buffer layer may be a rubber layer or a silicone layer to prevent the fifth limiting block 123 from scratching the positive electrode tab 220.

[0068] In the specific implementation process, the fifth limiting block 123 can be detachably connected to the second clamping plate 120, which can be achieved by bolts and threaded holes.

[0069] For further information, please continue reading. Figure 1 and Figure 2 The electrode limiting assembly 100 also includes a connecting plate 124. One end of the connecting plate 124 is connected to the fourth limiting block 122, and the other end is connected to the fifth limiting block 123. When the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the first limiting block 112 abuts against the connecting plate 124.

[0070] Therefore, on the one hand, by setting the connecting plate 124 to connect the fourth limiting block 122 and the fifth limiting block 123, the distance between the fourth limiting block 122 and the fifth limiting block 123 is kept stable, and the first limiting block 112 can be extended into the space between the fourth limiting block 122 and the fifth limiting block 123.

[0071] The fourth limiting block 122, the connecting plate 124, and the fifth limiting block 123 can be integrally formed parts.

[0072] It is understandable that when the first clamping plate 110 and the second clamping plate 120 clamp the battery cell 200, the first limiting block 112 abuts against the connecting plate 124, the second limiting block 115 and the fourth limiting block 122 clamp the negative electrode tab 210, and the third limiting block 114 and the fifth limiting block 123 clamp the positive electrode tab 220.

[0073] 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.

[0074] 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 tab limiting assembly, characterized in that, include: The first clamping plate and the second clamping plate are opposite to each other. The first clamping plate includes a first surface facing the second clamping plate, and the second clamping plate includes a second surface facing the first clamping plate. The battery cell is clamped between the first surface and the second surface. The first limiting block is detachably disposed on the first surface of the first clamping plate. The first limiting block is located between the positive and negative tabs of the battery cell. When the battery cell enters the cavity, after the first clamping plate and the second clamping plate clamp the battery cell, the positive and negative tabs abut against the first limiting block.

2. The electrode limiting assembly according to claim 1, characterized in that, The first limiting block includes a connected body segment and a guide segment. The body segment is disposed on the first surface, and the guide segment is connected to the side of the body segment away from the first surface. In the direction from the first clamping plate to the second clamping plate, the width of the guide segment decreases. When the battery cell enters the cavity, the first clamping plate and the second clamping plate hold the battery cell, and the positive and negative electrode tabs abut against the body segment.

3. The electrode limiting assembly according to claim 1, characterized in that, The distance between the first limiting block and the positive or negative electrode tab is less than or equal to 0.5 mm.

4. The electrode limiting assembly according to claim 1, characterized in that, The first limiting block has a first threaded blind hole on the side surface facing the first clamping plate, and the first clamping plate has a first threaded through hole; The electrode limiting assembly also includes: The first bolt passes through the first threaded through hole and the first threaded blind hole, and is threadedly engaged with the first threaded through hole and the first threaded blind hole.

5. The electrode limiting assembly according to claim 4, characterized in that, The first threaded blind hole is a waist-shaped hole, and the length direction of the first threaded blind hole is consistent with the direction from the negative electrode tab to the positive electrode tab.

6. The electrode limiting assembly according to claim 1, characterized in that, The first limiting block includes a first side facing the negative electrode tab, and the first side is provided with a first buffer layer; And / or, the first limiting block includes a second side facing the positive electrode tab, and the second side is provided with a second buffer layer.

7. The electrode limiting assembly according to claim 1, characterized in that, Also includes: The second limiting block is provided on the first surface. When the first clamping plate and the second clamping plate clamp the battery cell, the second limiting block abuts against the negative electrode tab. And / or, a third limiting block, the third limiting block being disposed on the first surface, wherein when the first clamping plate and the second clamping plate clamp the battery cell, the third limiting block abuts against the positive electrode tab.

8. The electrode limiting assembly according to claim 7, characterized in that, The first limiting block, the second limiting block, and the third limiting block are integrally formed parts.

9. The electrode limiting assembly according to claim 1, characterized in that, Also includes: The fourth limiting block is disposed on the second surface. When the first clamping plate and the second clamping plate clamp the battery cell, the fourth limiting block abuts against the negative electrode tab. And / or, a fifth limiting block, the fifth limiting block being disposed on the second surface, wherein when the first clamping plate and the second clamping plate clamp the battery cell, the fifth limiting block abuts against the positive electrode tab.

10. The electrode limiting assembly according to claim 9, characterized in that, Also includes: A connecting plate, one end of which is connected to the fourth limiting block and the other end of which is connected to the fifth limiting block. When the first clamping plate and the second clamping plate clamp the battery cell, the first limiting block abuts against the connecting plate.

Images