Battery cell structure and preparation method thereof, and soft package lithium battery

Abstract

The present disclosure provides a battery cell structure and its assembling method, and a soft package lithium battery. The battery cell structure includes a battery cell, a packaging area and a first tab. The packaging area is arranged at one end of the battery cell in the height direction. One end of the first tab extends into the packaging area and is connected with the battery cell. The other end of the first tab is exposed outside the packaging area. The top sealing edge of the packaging area is folded along the width direction of the battery cell to form a folded top sealing edge, which is connected with the end of the battery cell. The first tab is folded along the width direction of the battery cell to form a folded tab, which forms a mounting cavity together with the folded top sealing edge. A TCO assembly is arranged on the folded top sealing edge. A welding piece on one side of the TCO assembly is embedded in the mounting cavity along the width direction of the battery cell and is welded and fixed with the folded tab. The battery cell structure ensures that the overall size of the battery cell structure does not change greatly and ensures the stability of the TCO assembly connection, so as to adapt to some narrow space applications.

Description

Technical Field

[0001] This disclosure relates to the field of battery cell structure technology, and in particular to a battery cell structure and its assembly method, as well as a pouch lithium battery. Background Technology

[0002] To ensure the safety of pouch lithium batteries, a TCO (Thermal Cut-off Device) component is usually installed vertically on the top seal edge of the pouch lithium battery cell to quickly cut off the current in case of over-temperature or over-current, thus preventing safety issues caused by thermal runaway of the pouch lithium battery.

[0003] However, as the energy density requirements for battery cells increase, a problem arises where the cell width increases while the top seal width decreases. When the top seal width of the cell is smaller than the width of the TCO module, the width of a traditional vertically mounted TCO module exceeds the space of the top seal, resulting in a gap between the traditional vertically mounted TCO module and the top seal. Figure 1 As shown, the vertically installed TCO component has a partial gap between itself and the top sealing edge, which makes the installed TCO component prone to tilting. Figure 2 As shown. In addition, because the width of traditional vertically mounted TCO modules exceeds the space of the top sealing edge, the overall width of the cell structure becomes larger and cannot be adapted to some applications in confined spaces. Summary of the Invention

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a cell structure and its assembly method that ensures that the overall size of the cell structure does not change significantly and that the TCO component connection is stable, as well as a soft-pack lithium battery.

[0005] The purpose of this disclosure is achieved through the following technical solution: A battery cell structure, comprising: A battery cell assembly includes a battery cell, a packaging area, and a first tab. The packaging area is located at one end of the battery cell in the height direction. One end of the first tab extends into the packaging area and is connected to the battery cell. The other end of the first tab is exposed outside the packaging area. The top sealing edge of the packaging area is folded along the width direction of the battery cell to form a bent top sealing edge, which is connected to the end of the battery cell. The first tab is folded along the width direction of the battery cell to form a bent tab, which, together with the bent top sealing edge and the end of the battery cell, forms a mounting cavity. The TCO component is laid flat on the bent top sealing edge; a weldment is formed on one side of the TCO component, the weldment is folded and embedded in the mounting cavity along the width direction of the cell, and welded and fixed to the bent electrode tab; Wherein, the width L of the TCO component TCO The following condition I must be satisfied: L1≤L TCO ≤W, L1 is the width of the bent top sealing edge, and W is the width of the battery cell; The length L2 of the mounting cavity satisfies the following condition II: L2≤W; Insulating fixing components are respectively disposed on the bent electrode tab and the TCO component.

[0006] In one embodiment, the mounting cavity has an opening through which the welded component is folded and fitted into the mounting cavity; and / or, The end of the battery cell has a bare, rounded portion formed on the side opposite to the folding direction of the bent top seal.

[0007] In one embodiment, the top sealing edge is located at a position of 1 / 20 to 1 / 3 of the cell width.

[0008] In one embodiment, the TCO assembly includes a TCO die, an insulating layer, an output connector, and a solder joint; the TCO die has a horizontal mounting surface for abutting against the bent top seal edge; the output connector and the solder joint are both disposed on the same side of the TCO die, the extension direction of the output connector is perpendicular to the extension direction of the TCO die, and the extension direction of the solder joint bends and intersects the extension direction of the TCO die; the insulating layer is disposed on the TCO die.

[0009] In one embodiment, the cell assembly further includes a fixing adhesive layer disposed between the bent top seal and the end of the cell.

[0010] In one embodiment, the insulating fixing assembly includes an insulating coating layer and an insulating cover plate adhesive layer; the insulating coating layer is disposed at the connection between the bent electrode lug and the welded part; the insulating cover plate adhesive layer is disposed on the bent electrode lug and the TCO assembly, the insulating cover plate adhesive layer is used to fix the bent electrode lug and the TCO assembly, and the insulating cover plate adhesive layer extends along the length direction of the TCO assembly to both ends of the bent top sealing edge.

[0011] In one embodiment, the extending direction of the insulating overlay layer is perpendicular to the extending direction of the insulating cover layer; and / or, The bent end of the insulating coating layer forms a first folding clearance with the welded component; and / or The bent end of the insulating coating layer forms a second folding gap with the first tab; and / or, the insulating cover adhesive layer is disposed on the insulating coating layer, and the insulating cover adhesive layer extends along the length direction of the TCO assembly to both ends of the bent top seal.

[0012] In one embodiment, the TCO component is a return-to-situ TCO component; and / or, The battery cell assembly further includes a second tab, which is disposed on one side of the first tab, with one end of the second tab extending into the encapsulation area and connected to the battery cell; the other end of the second tab is bent and exposed outside the encapsulation area.

[0013] A method for assembling a battery cell structure includes the following steps: Obtain a TCO component and a packaged battery cell; wherein, the end of the battery cell has a packaging area and a first tab, the packaging area includes a top sealing edge and a side sealing edge connected to each other, the first tab is exposed outside the top sealing edge, and the width of the top sealing edge is less than or equal to the width of the TCO component; The top sealing edge is folded and fixed to the end of the battery cell along the width direction to form a bent top sealing edge; The TCO component is laid flat on the bent top sealing edge; The welding parts of the TCO component are welded and fixed to the first electrode tab; After welding and fixing, the first electrode tab and the welded part are coated with adhesive to form an insulating adhesive layer on the surface of the first electrode tab and the welded part. Along the width direction of the battery cell, the first electrode tab and the welded component, after being coated with adhesive, are simultaneously folded over so that the folded welded component is embedded in the first electrode tab. The first tab and the TCO assembly are fixed by an insulating cover adhesive layer to obtain the cell structure described in any of the above embodiments.

[0014] A pouch lithium battery, comprising the cell structure described in any of the above embodiments.

[0015] Compared with the prior art, this disclosure has at least the following advantages: Because the top sealing edge of the encapsulation area is folded along the width direction of the cell to form a bent top sealing edge, the operator can fold the vertical top sealing edge to the width direction of the cell, effectively reducing the height dimension of the cell assembly to ensure that the overall size of the cell structure does not change significantly. Since the bent top sealing edge is connected to the end of the cell, it can be integrated with the end of the cell, ensuring that the end of the cell provides good support for the bent top sealing edge. Furthermore, because the first electrode tab is folded along the width direction of the cell to form a bent electrode tab, the height dimension of the cell assembly is further reduced. Simultaneously, it ensures that the bent electrode tab, the bent top sealing edge, and the end of the cell form a mounting cavity, allowing the end of the cell to better compensate for the shorter width of the bent top sealing edge. This ensures that the bent mounting cavity uses the bent top sealing edge and the end of the cell as contact surfaces, thereby guaranteeing the stability of the connection between the cell, the bent top sealing edge, and the TCO assembly. Because the TCO component is laid flat on the bent top seal, it achieves a flat placement, ensuring good contact between the TCO component and the bent top seal. Since a weldment is formed on one side of the TCO component, and this weldment is folded and embedded in the mounting cavity along the width direction of the cell, it can be folded back to the width direction of the cell, further reducing the height dimension of the cell assembly and ensuring the compactness and robustness of the connection between the weldment and the first tab. Furthermore, because fixing components are respectively disposed on the bent tab and the TCO component, they are fixed, ensuring the stability of the connection between the TCO component, the bent top seal, the bent tab, and the cell. This effectively avoids the problem of contact gaps and skewing caused by the small width of the traditional encapsulation edge, making it particularly suitable for applications where the width of the top seal edge is smaller than the width of the TCO component.

[0016] While bending the top seal and the tabs can effectively solve the problem of unstable TCO module connections, if the length of the mounting cavity formed by bending the top seal and the tabs is too long, it will affect the overall width of the cell; if the length of the mounting cavity is too short, it will reduce the contact area between the TCO module and the bent top seal and the tabs, thus affecting the stability of the TCO module connection. Therefore, in this disclosure, by controlling the width L of the TCO module... TCO The following condition I must be satisfied: L1≤L TCO The length L2 of the mounting cavity satisfies the following condition (Equation II): L2≤W, ensuring that the length of the mounting cavity does not exceed the width of the battery cell. This guarantees that the installed TCO assembly will not exceed the width of the battery cell, thus ensuring that the overall size of the battery cell will not change significantly, making it better suited for applications in confined spaces. It also ensures sufficient contact between the TCO assembly and the bent top seal, bent tabs, and battery cell, thereby guaranteeing the stability of the TCO assembly connection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a traditional TCO component installed vertically. Figure 2 A schematic diagram illustrating the skewed structure resulting from the vertical installation of traditional TCO components; Figure 3 This is a schematic diagram of a battery cell structure according to an embodiment of the present invention; Figure 4 for Figure 3 A perspective sectional view of the battery cell structure shown in one direction; Figure 5 for Figure 4 Enlarged view of point A shown in the image; Figure 6 for Figure 5 Enlarged view of point B shown; Figure 7 This is a schematic diagram of a TCO component in one direction according to an embodiment of the present invention; Figure 8 This is a flowchart illustrating the assembly process of a battery cell structure according to an embodiment of the present invention. Figure 9 This is a schematic diagram illustrating the steps of the top sealing edge folding operation according to an embodiment of the present invention; Figure 10 This is a flowchart illustrating the assembly process of a battery cell structure according to another embodiment of the present invention. Figure 11 This is a schematic diagram of the structure for applying adhesive to the top edge according to an embodiment of the present invention.

[0019] Reference numerals: 10, Cell structure; 100, Cell assembly; 110, Cell; 111, Bare arc portion; 120, Encapsulation area; 121, Top sealing edge; 122, Side sealing edge; 130, First tab; 131, First tab body; 132, Tab adhesive layer; 140, Second tab; 200, Mounting cavity; 210, Opening; 300a, TCO assembly; 310, Welded component; 311, Welded part; 320, TCO bare sheet; 321, Horizontal mounting surface; 330, Insulating adhesive layer; 340, Output connector; 300b, Return-to-home type TCO assembly; 400, Insulating fixing assembly; 410, Insulating coating layer; 411, Bending end; 412, First folding movement gap; 413, Second folding movement gap; 414, Starting end; 420, Insulating cover adhesive layer; 500, Fixing adhesive layer. Detailed Implementation

[0020] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] 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 disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Please see Figures 3 to 5To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments. One embodiment of the battery cell structure 10 includes a battery cell assembly 100 and a TCO assembly 300a. The battery cell assembly 100 includes a battery cell 110, a packaging area 120, and a first tab 130. The packaging area 120 is disposed at one end of the battery cell 110 in the height direction. One end of the first tab 130 extends into the packaging area 120 and is connected to the battery cell 110. The other end of the first tab 130 is exposed outside the packaging area 120, thus achieving the connection between the first tab 130 and the battery cell 110. Because the top sealing edge 121 of the packaging area 120 is folded along the width direction of the battery cell 110 to form a bent top sealing edge 121, the operator can fold the vertical top sealing edge 121 to the width direction of the battery cell 110, effectively reducing the dimension of the battery cell assembly 100 in the height direction, thereby ensuring that the overall dimension of the battery cell structure 10 does not change significantly. Since the bent top seal 121 is connected to the end of the battery cell 110, the bent top seal 121 can be connected to the end of the battery cell 110 as a whole, thereby ensuring that the end of the battery cell 110 can provide good support for the bent top seal 121. Furthermore, since the first electrode tab 130 is folded along the width direction of the battery cell 110 to form a bent electrode tab, the height dimension of the battery cell assembly 100 is further reduced. At the same time, it is ensured that the bent electrode tab can form a mounting cavity 200 with the bent top seal 121 and the end of the battery cell 110, so that the end of the battery cell 110 can better compensate for the short width of the bent top seal 121. This allows the bent mounting cavity 200 to have the bent top seal 121 and the end of the battery cell 110 as the contact surface, thereby ensuring the stability of the connection between the battery cell 110, the bent top seal 121, and the TCO assembly 300a.

[0024] It is understandable that since the TCO component 300a is laid flat on the bent top edge 121, the TCO component 300a is laid flat, which ensures that the laid flat TCO component 300a can have sufficient contact with the bent top edge 121. Because a weldment 310 is formed on one side of the TCO assembly 300a, and the weldment 310 is folded and embedded in the mounting cavity 200 along the width direction of the cell 110, the weldment 310 can be folded back to the width direction of the cell 110, further reducing the dimension of the cell assembly 100 in the height direction, and ensuring the structural compactness and firmness of the connection between the weldment 310 and the first tab 130; and because the fixing components are respectively set on the bent tab and the TCO assembly 300a, the bent tab and the TCO assembly 300a are fixed, thereby ensuring the stability of the connection between the TCO assembly 300a, the bent top seal 121, the bent tab and the cell 110; effectively avoiding the problem of contact gaps and skewing of the TCO assembly 300a caused by the small width of the traditional packaging edge, especially suitable for the application of cell 110 where the width of the top seal 121 is smaller than the width of the TCO assembly 300a.

[0025] It is understandable that although bending the top sealing edge 121 and bending the electrode tab can effectively solve the problem of unstable connection of TCO module 300a, if the length of the mounting cavity 200 formed by bending the top sealing edge 121 and bending the electrode tab is too long, it will affect the overall width of the cell 110; if the length of the mounting cavity 200 is too small, it will reduce the contact area between TCO module 300a and the bent top sealing edge 121 and bent electrode tab, thereby affecting the connection stability of TCO module 300a. Therefore, in this disclosure, by controlling the width L of the TCO module 300a... TCO The following condition I must be satisfied: L1≤L TCO The length L2 of the mounting cavity 200 satisfies the following condition: L2≤W, ensuring that the length of the mounting cavity 200 does not exceed the width of the cell 110, thereby ensuring that the installed TCO assembly 300a does not exceed the width of the cell 110, and thus ensuring that the overall size of the cell 110 does not change significantly, so as to better adapt to some applications in narrow spaces; at the same time, it also ensures that the TCO assembly 300a has sufficient contact with the bent top seal 121, the bent tab and the cell 110, thereby ensuring the stability of the connection of the TCO assembly 300a.

[0026] In one embodiment, when the width of the top sealing edge 121 of the battery cell 110 is less than 2 mm, a TCO component 300a with a width greater than 2.8 mm cannot be placed. This would cause the width of the TCO component 300a to exceed the width of the top sealing edge 121 of the battery cell 110 (>0.8 mm), resulting in a gap in the contact between the TCO component 300a and the top sealing edge 121 of the battery cell 110.

[0027] In one embodiment, the mounting cavity 200 has an opening 210 through which the welded component 310 is folded and embedded in the mounting cavity 200, facilitating quick installation of the TCO assembly 300a by the operator.

[0028] like Figure 5 and Figure 6 As shown, in one embodiment, the end of the cell 110 has a bare arc portion 111 formed on the side opposite to the folding direction of the bent top seal 121, so that the bent top seal 121 after the folding operation can form a large space mounting cavity 200 with the bare arc portion 111 and the bent tab, thereby providing sufficient placement space for the TCO assembly 300a.

[0029] In one embodiment, the radius of curvature of the bare, hollow arc portion 111 is 2°-15°.

[0030] It should be noted that if the top sealing edge 121 is folded directly, and the width of the top sealing edge 121 is too small, the accommodating space of the folded mounting cavity 200 will be small, which will not provide sufficient placement space for the TCO component 300a. Therefore, in one embodiment, the operator can weld and fix the welding part 310 of the actual TCO component 300a to the first electrode 130, and then adjust the folding size of the first electrode 130 according to the width of the bent top sealing connection. This can better compensate for the accommodating space of the mounting cavity 200, thereby ensuring that the mounting cavity 200 can provide sufficient placement space for the TCO component 300a, and thus ensuring the stability of the TCO component 300a connection.

[0031] It can also be understood that by adjusting the length of the first tab 130 fold, the overall length of the mounting cavity 200 and the position of the mounting cavity 200 at the end of the cell 110 can be adjusted to ensure that the folded mounting cavity 200 has a large space, and at the same time, it can ensure that the folded mounting cavity 200 is always located in the middle position of the end of the cell 110, thereby ensuring that the installed TCO assembly 300a is located in the middle of the end of the cell 110, thus ensuring the stability of the connection between the cell 110, the bent top seal 121 and the TCO assembly 300a.

[0032] like Figure 6 As shown, in one embodiment, the first tab 130 includes a first tab body 131 and a tab adhesive layer 132. The tab adhesive layer 132 is disposed between the first tab 130 and the top sealing edge 121 to achieve a sealing arrangement between the first tab 130 and the top sealing edge 121.

[0033] It should be noted that although adjusting the folding length of the first tab 130 can compensate for the accommodating space of the mounting cavity 200 to a certain extent, since the first tab 130 does not fully cover the tab adhesive layer 132, the bottom of the compensation cavity formed by the folding will have a step difference due to the insufficient length of the tab adhesive layer 132. That is, the bottom of the accommodating cavity is uneven, which will cause a gap in the contact between the TCO component 300a and the compensation cavity, and the problem of unstable connection of the TCO component 300a still exists.

[0034] Therefore, in one embodiment, the pre-set micro-gap at the outer edge of the tab adhesive layer 132 is used as the folding point, so that the tab adhesive layer 132 after the folding operation is located at the bottom of the mounting cavity 200, so as to better ensure the flatness of the bottom of the mounting cavity 200, thereby ensuring sufficient contact of the TCO component 300a; and the added pre-set micro-gap ensures that the folding point of the first tab 130 is not provided with the tab adhesive layer 132, which ensures that the operator can complete the folding operation quickly and flat.

[0035] In one embodiment, the preset micro-gap is 0.2mm-1.0mm to ensure that the preset micro-gap formed after folding is suitable, so as to ensure that the operator can quickly complete the folding operation while also ensuring the flatness of the tab adhesive layer 132 after folding.

[0036] In one embodiment, the inner surface of the folded tab adhesive layer 132 is flush with the surface of the bent top seal 121 to ensure that the thickness difference between the folded tab adhesive layer 132 and the bent top seal 121 is small, thereby ensuring the flatness of the bottom of the folded cavity.

[0037] In one embodiment, the top sealing edge 121 is located at 1 / 20-1 / 3 of the width of the cell 110 to ensure that the width of the bare arc portion 111 that can be formed at the end of the cell 110 is appropriate, thereby ensuring that the mounting cavity 200 after folding has a large space, and also ensuring that the formed mounting cavity 200 can be located in the middle of the end of the cell 110, thereby providing stable support for the TCO assembly 300a.

[0038] like Figure 7 and Figure 8As shown, in one embodiment, the TCO assembly 300a includes a TCO die 320, an insulating adhesive layer 330, an output connector 340, and a welded component 310; the TCO die 320 has a horizontal mounting surface 321, which is used to abut against the bent top sealing edge 121, allowing the operator to use the horizontal mounting surface 321 as a flattening reference surface to achieve a quick flattening operation of the TCO assembly 300a; the output connector 340 and the welded component 310 are both disposed on the TCO die 320. On the same side of the TCO die 320, the extension direction of the output connector 340 is perpendicular to the extension direction of the TCO die 320, and the extension direction of the weldment 310 bends and intersects the extension direction of the TCO die 320, thus achieving a flat arrangement of the TCO assembly 300a to ensure that the overall size of the cell structure 10 does not change significantly; the insulating adhesive layer 330 is disposed on the TCO die 320 to ensure that the weldment 310 and the TCO die 320 are insulated after being folded.

[0039] like Figure 5 and Figure 6 As shown, in one embodiment, the battery cell assembly 100 further includes a fixing adhesive layer 500, which is disposed between the bent top seal 121 and the end of the battery cell 110 to achieve better fixation between the bent top seal 121 and the end of the battery cell 110, thereby ensuring that the end of the battery cell 110 can provide stable support for the bent top seal 121.

[0040] In one embodiment, the battery cell 110 includes an aluminum-plastic packaging bag and a battery cell 110 body disposed within the aluminum-plastic packaging bag.

[0041] In one embodiment, a fixing adhesive layer 500 is disposed on the aluminum-plastic packaging bag at the ends of the bent top seal 121 and the battery cell 110.

[0042] In one embodiment, the thickness of the aluminum-plastic packaging bag is 0.1mm-1.0mm.

[0043] In one embodiment, the fixing adhesive layer 500 is a hot melt adhesive layer.

[0044] In one embodiment, the hot melt adhesive layer is either a PUR (Polyurethane Reactive) adhesive layer or a UV (Photo-curing Adhesive Layer) adhesive layer.

[0045] In one embodiment, the PUR adhesive layer is of type 2820.

[0046] In one embodiment, the four edges of the fixing adhesive layer 500 are aligned with the four edges of the bent top seal 121, achieving full coverage of the fixing adhesive layer 500 on the bent top seal 121. This ensures the flatness of the connection between the bent top seal 121 and the end of the battery cell 110, and also ensures the stability of the connection between the bent top seal 121 and the end of the battery cell 110.

[0047] In one embodiment, the insulating fixing assembly 400 includes an insulating coating layer 410 and an insulating cover plate adhesive layer 420. The insulating coating layer 410 is disposed at the connection between the bent electrode tab and the welded component 310, so that the added insulating coating layer 410 can achieve better fixing and insulating protection at the connection between the bent electrode tab and the welded component 310, so as to ensure that the phenomenon of folding displacement does not easily occur when the first electrode tab 130 and the welded component 310 are folded simultaneously, and to ensure that the operator can quickly and smoothly complete the synchronous folding operation of the first electrode tab 130 and the welded component 310. Since the insulating cover plate adhesive layer 420 is disposed on the bent electrode tab and the TCO assembly 300a, the insulating cover plate adhesive layer 420 is used to fix the bent electrode tab and the TCO assembly 300a, thereby achieving fixing and insulating protection of the bent electrode tab and the TCO assembly 300a.

[0048] like Figure 6 As shown, in one embodiment, the bent end 411 of the insulating coating layer 410 forms a first folding gap 412 with the welded part 310 to ensure that the welded part 310 has a certain degree of flexibility when folded. In particular, in conjunction with the use of the second folding gap 413 formed between the bent end 411 of the insulating coating layer 410 and the first tab 130, the first tab 130 is ensured to have a certain degree of flexibility when folded, so that the operator can quickly and smoothly complete the synchronous folding operation of the first tab 130 and the welded part 310.

[0049] like Figure 6 As shown, in one embodiment, the starting end 414 of the insulating coating layer 410 is connected to the aluminum-plastic packaging bag at the end of the battery cell 110, thereby fixing the insulating coating layer 410 to the aluminum-plastic packaging bag at the end of the battery cell 110. This ensures that the first tab 130 and the welded part 310 will not shift during subsequent folding operations, thus ensuring that the first tab 130 can fit and align well with the welded part 310 after the folding operation. This further ensures the flatness and compactness of the bent tab and welded part 310 after the folding operation, making it better suited for applications in confined spaces.

[0050] In one embodiment, the insulating cover adhesive layer is disposed on the insulating coating layer 410, and the insulating cover adhesive layer extends along the length direction of the TCO component 300a to both ends of the bent top sealing edge 121. In particular, in conjunction with the use of the aluminum-plastic packaging bag connecting the starting end 414 of the insulating coating layer 410 to the end of the cell 110, the insulating coating layer 410 is fixed and insulated in the width direction of the TCO component 300a. The added insulating coating layer 410 and the insulating cover adhesive layer 420 are simultaneously fixed in the width and length directions of the TCO component 300a, thereby ensuring the stability of the connection of the TCO component 300a.

[0051] In one embodiment, the extending direction of the insulating overlay layer 410 is perpendicular to the extending direction of the insulating cover layer 420, ensuring that the insulating overlay layer 410 and the insulating cover layer 420 can achieve better fixation of the TCO component 300a in the width and length directions.

[0052] like Figure 8 As shown, in one embodiment, a welding part 311 is formed at the connection between the welding part 310 and the bent electrode tab, thereby achieving welding and fixing of the welding part 310 and the bent electrode tab.

[0053] In one embodiment, the area of ​​the welded portion 311 is smaller than the area of ​​the welded part 310.

[0054] In one embodiment, the periphery of the welded portion 311 forms a first preset distance with the periphery of the welded component 310.

[0055] In one embodiment, the first preset distance is <1.0mm to ensure that the area of ​​the welding part 311 is suitable. In this way, while satisfying the welding stability between the first electrode tab 130 and the welding part 310, it also makes it easy for the operator to quickly complete the folding operation, effectively avoiding the problem that the operator has difficulty folding due to the large area of ​​the welding part 311, and that folding is prone to breakage or cracking.

[0056] It should be noted that although welding the first electrode tab 130 and the welded part 310 can solve the problem of folding and displacement to a certain extent, there is an unwelded area between the first electrode tab 130, the welded part 310 and the welded part 311. This results in a high degree of flexibility between the first electrode tab 130 and the welded part 310, and the first electrode tab 130 and the welded part 310 still have the problem of displacement during folding. Therefore, in this disclosure, by adding an insulating coating layer 410, and controlling the bending end 411 of the insulating coating layer 410 to form a first folding movement gap 412 with the welded part 310, and the bending end 411 of the insulating coating layer 410 to form a second folding movement gap 413 with the first electrode tab 130, the flexibility of the first electrode tab 130 during folding is ensured to be more suitable, ensuring that the operator can quickly and smoothly complete the synchronous folding operation of the first electrode tab 130 and the welded part 310, reducing the problem of displacement of the first electrode tab 130 and the welded part 310 during folding.

[0057] In one embodiment, the area of ​​the insulating coating layer 410 is larger than the area of ​​the welded part 311, and the periphery of the insulating coating layer 410 forms a second preset distance with the periphery of the welded part 311. This ensures that the distribution area of ​​the insulating coating layer 410 in the welded part 311 is more suitable. In this way, while satisfying the requirement for good coating and fixing at the connection between the bent tab and the welded part 310, the waste of the insulating coating layer 410 is also avoided. It also ensures that the folded insulating coating layer 410 can fill the gap between the welded part 310 and the insulating coating layer 330, thereby ensuring the stability and compactness of the connection between the TCO component 300a and the bent top seal 121.

[0058] In one embodiment, the second preset distance is 0.5mm-2.0mm.

[0059] In one embodiment, the insulating coating layer 410 is a DuPont adhesive tape layer or a masking tape layer.

[0060] In one embodiment, the weldment 310 is a first nickel sheet to ensure that the operator can complete the folding and welding operations.

[0061] In one embodiment, the output connector 340 is a first nickel sheet to ensure that the operator can complete the folding and welding operations.

[0062] In one embodiment, the height of the mounting cavity 200 is equal to the thickness of the insulating coating layer 410, the thickness of the welded component 310, the thickness of the TCO bare die 320, and the thickness of the insulating adhesive layer 330. This ensures that the bent tab, welded component 310, insulating coating layer 410, TCO bare die 320, and bent top seal 121 can be stacked. On the one hand, this saves space in the height direction of the cell structure 10, thereby ensuring that the size of the cell structure 10 does not change significantly. On the other hand, it ensures the stability of the connection between the layers of the cell structure 10.

[0063] In one embodiment, the thickness of the insulating coating layer 410 is 0.1 mm to 0.5 mm.

[0064] In one embodiment, both the weldment 310 and the output connector 340 are first nickel sheets, and the thickness of the first nickel sheets is 0.08mm-0.3mm.

[0065] In one embodiment, the TCO die 320 is a second nickel sheet.

[0066] In one embodiment, the thickness of the second nickel sheet is 0.08 mm to 0.15 mm.

[0067] In one embodiment, the thickness of the insulating adhesive layer 330 is 0.1 mm to 0.2 mm.

[0068] In one embodiment, the TCO component 300a is a return-to-home type TCO component 300b, which ensures that the output connector 340 of the folded return-to-home type TCO component 300b can return to the original position of the battery cell 110 without changing the structure of the battery cell assembly 100 or the TCO component 300a. This not only simplifies the operation but also ensures the stability of the connection between the return-to-home type TCO component 300a and the bent top sealing edge 121, making it better suited for applications in electronic products with limited space, such as laptops or mobile phones.

[0069] In one embodiment, the cell assembly 100 further includes a second tab 140, which is disposed on one side of the first tab 130. One end of the second tab 140 extends into the encapsulation region 120 and is connected to the cell 110. The other end of the second tab 140 is bent and exposed outside the encapsulation region 120, so that the second tab 140 is bent and disposed on one side of the encapsulation region 120, to ensure that the size of the cell structure 10 does not change significantly, and at the same time to ensure the normal operation of the cell structure 10.

[0070] In one embodiment, the extension direction of the second tab 140 exposed in the encapsulation area 120 is perpendicular to the extension direction of the bent top seal 121, thereby achieving a bent and exposed configuration at the other end of the second tab 140.

[0071] It should be noted that folding or bending is a common process in the production of pouch batteries. To ensure efficiency and flatness during folding, a step-by-step folding operation is usually adopted. This ensures that the parts fit together smoothly after each folding operation, but this results in low folding efficiency.

[0072] Therefore, this disclosure also provides a method for assembling a battery cell structure 10. First, a TCO component 300a and a packaged battery cell 110 are obtained; wherein, the end of the battery cell 110 has a packaging area 120 and a first tab 130, the packaging area 120 includes a top sealing edge 121 and a side sealing edge 122 connected to each other, the first tab 130 is exposed outside the top sealing edge 121, and the width of the top sealing edge 121 is less than or equal to the width of the TCO component 300a; then, the top sealing edge 121 is assembled along the width direction of the battery cell 110. Edge 121 is folded and fixed to the end of the battery cell 110 to form a bent top sealing edge 121; then, the TCO assembly 300a is laid flat on the bent top sealing edge 121; subsequently, the welding part 310 of the TCO assembly 300a is welded and fixed to the first electrode tab 130, so that the first electrode tab 130 and the welding part 310 are connected as a whole, ensuring that the welding part 310 and the first electrode tab 130 can be quickly and smoothly folded using only one synchronous folding operation; then, the... After welding and fixing, the first electrode tab 130 and the welded component 310 are coated with adhesive to form an insulating adhesive layer 410 on their surfaces, reducing displacement during the synchronous folding operation. Then, along the width direction of the battery cell 110, the coated first electrode tab 130 and the welded component 310 are synchronously folded, so that the folded welded component 310 is embedded in the first electrode tab 130. The internal structure ensures that the welding part 310 and the first tab 130 can be quickly and smoothly folded using only one synchronous folding operation. Finally, the first tab 130 and the TCO component 300a are fixed by the insulating cover adhesive layer 420, which improves the connection stability of the first tab 130, the TCO component 300a and the end of the cell 110, so as to efficiently obtain a cell structure 10 with good connectivity, compact structure and high flatness, thereby ensuring that the overall size of the cell structure 10 does not change significantly.

[0073] The above-described battery cell structure 10 assembly method involves first welding and fixing the first tab 130 and the welding component 310, and then applying an adhesive coating to the welded first tab 130 and the welding component 310. This ensures that the folding flexibility between the first tab 130 and the welding component 310 is appropriate, thereby ensuring that the welding component 310 and the first tab 130 can be quickly and smoothly folded using only one synchronous folding operation. This efficiently yields a battery cell structure 10 with good connectivity, compact structure, and high flatness, thus ensuring that the overall size of the battery cell structure 10 does not change significantly. This effectively reduces the problem of low folding efficiency in traditional step-by-step folding operations.

[0074] In one embodiment, the battery cell structure 10 assembly method includes some or all of the following steps: S101. Obtain the TCO component 300a and the packaged battery cell 110; wherein, the end of the battery cell 110 forms a packaging area 120 and a first tab 130, the packaging area 120 includes a top sealing edge 121 and a side sealing edge 122 connected to each other, the first tab 130 is exposed outside the top sealing edge 121, the width of the top sealing edge 121 is less than the width of the TCO component 300a, so that the width of the top sealing edge 121 at the end of the battery cell 110 is less than the width of the TCO component 300a. For example, if the width of the top sealing edge 121 of the battery cell 110 is < 2mm, and the width of the TCO component 300a is 2.8mm, there will be a gap between the traditional vertically installed TCO component 300a and the width of the top sealing edge 121.

[0075] In one embodiment, after obtaining the TCO component 300a and the packaged battery cell 110, and before folding and fixing the top sealing edge 121 to the end of the battery cell 110 along its width direction, the following step is further included: applying adhesive to the top sealing edge 121, such as... Figure 11 As shown, a hot melt adhesive layer is formed on the side of the top seal 121 facing the end of the battery cell 110 to ensure that the top seal 121 can be glued and fixed to the aluminum-plastic packaging bag at the end of the battery cell 110 after subsequent folding.

[0076] In one embodiment, the specific steps of applying adhesive to the top sealing edge 121 include: applying adhesive from the four edges of the side of the top sealing edge 121 facing the end of the battery cell 110 towards the center point of the top sealing edge 121, so as to achieve full coverage of the fixing adhesive layer 500 on the bent top sealing edge 121, ensuring that the four edges of the finally formed fixing adhesive layer 500 are aligned with the four edges of the bent top sealing edge 121. In this way, on the one hand, the flatness of the connection between the bent top sealing edge 121 and the end of the battery cell 110 is guaranteed, and on the other hand, the stability of the connection between the bent top sealing edge 121 and the end of the battery cell 110 is guaranteed.

[0077] It should be noted that if too much adhesive is applied, it will cause adhesive overflow when the top sealing edge 121 is folded and fixed to the end of the battery cell 110 along its width direction. If too little adhesive is applied, the connection stability and flatness between the bent top sealing edge 121 and the end of the battery cell 110 cannot be guaranteed. Therefore, in this disclosure, the adhesive application weight is controlled to satisfy the following relationship III: W t =(W-L3×2)×(L1-L3)×T×p×10 -3 Where Wt is the weight of the adhesive applied, in grams; W is the width of the battery cell 110, in millimeters; L1 is the width of the bent top sealing edge 121, in millimeters; L3 is the allowable margin for adhesive application on the width of the bent top sealing edge 121, in millimeters; L4 is the allowable margin for adhesive application on the length of the bent top sealing edge 121, in millimeters; and p is the density of the fixing adhesive layer 500, in g / cm³. 3 T represents the thickness of the 500mm fixing adhesive layer; L3 is 0.5mm-1.0mm; L4 is 0.1mm-0.3mm; T is 0.1mm-0.3mm; p is 1.00g / cm³. 3 -1.10g / cm 3 The dimensions W and L1 are the actual dimensions of the battery cell 110 to ensure a suitable distribution of adhesive weight. This ensures that no adhesive overflow occurs when the top sealing edge 121 is folded and fixed to the end of the battery cell 110 along its width direction. This not only reduces subsequent adhesive removal operations but also reduces waste of the fixing adhesive layer 500. At the same time, it ensures that the folded fixing adhesive layer 500 can fully fill the gap between the bent top sealing edge 121 and the end of the battery cell 110. This not only ensures the connection stability between the bent top sealing edge 121 and the end of the battery cell 110 but also ensures the flatness of the connection between the bent top sealing edge 121 and the end of the battery cell 110. This ensures that the bottom of the formed mounting cavity 200 has high flatness, thereby ensuring that the bottom of the mounting cavity 200 can fully contact the TCO component 300a.

[0078] In one embodiment, the thickness of the aluminum-plastic packaging bag is 0.1mm-1.0mm to ensure that the thickness of the aluminum-plastic packaging bag is suitable. In this way, while satisfying the sealing protection of the battery cell 110, it is also ensured that the bent top seal 121 can fit well with the aluminum-plastic packaging bag at the end of the battery cell 110. This ensures the flatness of the bent top seal 121 and the aluminum-plastic packaging bag at the end of the battery cell 110, thereby ensuring that the bottom of the formed mounting cavity 200 has a high degree of flatness. This ensures that the horizontal mounting surface 321 of the TCO component 300a can fully contact the bottom of the mounting cavity 200, effectively reducing the contact gap between the TCO component 300a and the bottom of the mounting cavity 200.

[0079] S102. The top sealing edge 121 is folded and fixed to the end of the battery cell 110 along the width direction to form a bent top sealing edge 121. This allows the operator to fold the vertical top sealing edge 121 to the width direction of the battery cell 110, effectively reducing the height dimension of the battery cell assembly 100 and ensuring that the overall size of the battery cell structure 10 does not change significantly. Since the bent top sealing edge 121 is connected to the end of the battery cell 110, it can be connected to the end of the battery cell 110 as a whole, thereby ensuring that the end of the battery cell 110 can provide good support for the bent top sealing edge 121.

[0080] In one embodiment, the two sides of the bent top sealing edge 121 are respectively spaced apart from the side sealing edge 122 to ensure that the two sides of the bent top sealing edge 121 will not abut against the side sealing edge 122 after the folding operation, thereby ensuring that the overall width of the cell structure 10 will not change.

[0081] In one embodiment, the width of the preset spacing gradually increases from the end near the bent top seal edge 121 to the end away from the bent top seal edge 121, ensuring that the resulting preset spacing is appropriate. This ensures a large contact area between the bent top seal edge 121 and the end of the cell 110, while also ensuring that the folded bent top seal edge 121 does not touch the side seal edges 122 on both sides of the encapsulation area 120, thus ensuring that the overall dimensions of the cell structure 10 do not change. Specifically, the preset spacing can be a V-shaped preset spacing.

[0082] In one embodiment, the preset spacing is 0.1mm-0.5mm.

[0083] In one embodiment, when the top sealing edge 121 is folded and fixed to the end of the battery cell 110 along the width direction of the battery cell 110, the top sealing edge 121 is folded 90° along the horizontal X direction of the battery cell 110, so that the top sealing edge 121 in the vertical Y direction can be folded towards the horizontal X direction.

[0084] In one embodiment, the step of folding the top sealing edge 121 90° along the horizontal X direction of the cell 110 includes the following specific steps: first folding the top sealing edge 121 30° along the horizontal X direction of the cell 110, then folding it 60°, and finally folding it 90°.

[0085] S103. The TCO component 300a is laid flat on the bent top edge 121; the flat-laid TCO component 300a can better ensure sufficient contact with the bent top edge 121, and reduce the contact gap between the TCO component 300a and the bent top edge 121.

[0086] In one embodiment, since the TCO die 320 of the TCO component 300a has a horizontal mounting surface 321, the operator can use the horizontal mounting surface 321 as a flattening reference surface to achieve a quick flattening operation of the TCO component 300a. This ensures that the horizontal mounting surface 321 of the TCO component 300a can make full contact with the bent top sealing edge 121, thereby ensuring that the end of the cell 110 can provide better support for the bent top sealing edge 121.

[0087] In one embodiment, before the step of laying the TCO component 300a flat on the bent top seal 121, and after the step of folding and fixing the top seal 121 to the end of the cell 110 along the width direction of the cell 110, the following step is further included: folding the output connector 340 of the TCO component 300a so that the extension direction of the output connector 340 is perpendicular to the extension direction of the TCO die 320.

[0088] S104. The welding part 310 of the TCO component 300a is welded and fixed to the first electrode 130 to achieve welding and fixing of the welding part 310 and the first electrode 130. This ensures that the operator can achieve the folding operation of the welding part 310 and the first electrode 130 with only one synchronous folding operation. In this way, on the one hand, the assembly steps are reduced, and on the other hand, it is ensured that the first electrode 130 can fit well with the welding part 310 during the synchronous folding operation. This ensures that the welding part 310 can be well embedded and fixed in the first electrode 130 after folding, thereby ensuring the compact connection between the welding parts 310 and ensuring that the size of the cell structure 10 does not change significantly.

[0089] In one embodiment, the welding part 310 of the TCO component 300a is welded and fixed to the first tab 130 by laser welding technology, so that a welding part 311 is formed at the connection between the welding part 310 and the first tab 130.

[0090] In one embodiment, since the area of ​​the welding part 311 is smaller than the area of ​​the welding part 310, and since the periphery of the area of ​​the welding part 311 and the periphery of the welding part 310 form a first preset distance, it is ensured that there is an unwelded area between the first electrode tab 130 and the welding part 311, and there is an unwelded area between the welding part 310 and the welding part 311. This ensures that the first electrode tab 130 and the welding part 310 have high flexibility during the folding operation, and ensures that the subsequent operator can use only one synchronous folding operation to tightly embed the welding part 310 into the fold of the first electrode tab 130.

[0091] In one embodiment, the first preset distance is <1.0mm to ensure that the area of ​​the welding part 311 is suitable. In this way, while satisfying the welding stability of the first electrode 130 and the welding part 310, it is also convenient for the operator to quickly complete the synchronous folding. This effectively avoids the problem that the operator has to work hard to fold the welding part 311 because the area of ​​the welding part 311 is too large, and the folding is prone to breakage or cracking.

[0092] S105. After welding and fixing, the first electrode tab 130 and the welded part 310 are coated with adhesive to form an insulating adhesive layer 410 on the surface of the first electrode tab 130 and the welded part 310, so as to achieve the fixing and protection of the welded part 311 of the first electrode tab 130 and the welded part 310.

[0093] It should be noted that although welding the first tab 130 and the welded part 310 can solve the problem of displacement during folding to some extent, there are unwelded areas between the first tab 130, the welded part 310, and the welded portion 311. This results in a high degree of flexibility between the first tab 130 and the welded part 310, causing displacement to still occur during synchronous folding. Therefore, in one embodiment, an insulating adhesive layer 410 is formed on the surfaces of the first tab 130 and the welded part 310 by applying an adhesive coating, thereby ensuring that displacement is less likely to occur during folding operations.

[0094] It is understandable that if the surfaces of the first tab 130 and the welded part 310 are fully covered, the flexibility between the first tab 130, the welded part 310 and the welded part 311 will be extremely poor, making it impossible to perform a quick and flat folding operation on the first tab 130 and the welded part 310. Therefore, in this disclosure, since the bent end 411 of the insulating coating layer 410 and the end of the welded part 310 near the TCO bare sheet 320 form a first folding activity gap 412, and the bent end 411 of the insulating coating layer 410 and the end of the first tab 130 near the bent top sealing edge 121 form a second folding activity gap 413, the flexibility between the first tab 130, the welded part 310 and the welded part 311 is more suitable, ensuring that the operator can perform a quick and flat folding operation on the first tab 130 and the welded part 310.

[0095] In one embodiment, the first folding gap 412 is 0.2mm-2.0mm.

[0096] In one embodiment, the second folding gap 413 is 0.2mm-2.0mm.

[0097] In one embodiment, the starting end 414 of the insulating coating layer 410 is connected to the aluminum-plastic packaging bag at the end of the battery cell 110, thereby fixing the insulating coating layer 410 to the aluminum-plastic packaging bag at the end of the battery cell 110. This ensures that the first tab 130 and the welded part 310 will not shift during folding, thus ensuring that the first tab 130 can fit and align well with the welded part 310 after the folding operation. This further ensures the flatness and compactness of the bent tab and welded part 310 after the synchronous folding operation, making it better suited for applications in confined spaces.

[0098] In one embodiment, since the area of ​​the insulating coating layer 410 is larger than the area of ​​the welded part 311, and the periphery of the insulating coating layer 410 forms a second preset distance with the periphery of the welded part 311, and the second preset distance is 0.5mm-2.0mm, especially in conjunction with the use of the first folding movement gap 412 and the second folding movement gap 413, the synchronous folding operation is completed efficiently and smoothly. At the same time, it is also ensured that the insulating coating layer 410 after the synchronous folding operation can fill the gap between the welded part 310 and the insulating adhesive layer 330 of the folding movement gap, thereby ensuring the stability and compactness of the connection between the TCO component 300a and the bent top sealing edge 121.

[0099] In one embodiment, the two side edges of the insulating coating layer 410 are aligned with the two side edges of the first tab 130 and the two side edges of the welded part 310 to ensure that the insulating coating layer 410 does not extend to wrap around the two side edges of the first tab 130 and the welded part 310, thereby ensuring that the first tab 130 and the welded part 310 have good flexibility during the folding operation, and thus ensuring that the operator can complete the folding operation quickly and smoothly.

[0100] It should be noted that if the thickness of the insulating coating layer 410 is too thick, it will be difficult for the operator to quickly complete the folding operation. If the thickness of the insulating coating layer 410 is too thin, it will not be able to fix and protect the first tab 130 and the welded part 311 of the welded component 310. Therefore, in one embodiment, the thickness of the insulating coating layer 410 is 0.2mm-0.5mm to ensure that the thickness of the insulating coating layer 410 is suitable. In this way, while facilitating the operator to quickly complete the folding operation, it can also fix and protect the first tab 130 and the welded part 311 of the welded component 310, and also ensure that the insulating coating layer 410 does not affect the overall size of the cell structure 10, thereby ensuring that the size of the cell structure 10 does not change significantly.

[0101] S106. Along the width direction of the battery cell 110, the first electrode tab 130 and the welding component 310 after the coating operation are simultaneously folded, so that the folded welding component 310 is embedded in the first electrode tab 130.

[0102] It is understandable that the insulating coating layer 410 does not fully wrap and fix the first tab 130 and the welded part 310. This is to ensure that the welded part 310 and the first tab 130 are folded synchronously during the folding operation, so that the welded part 310 can be well fitted and fixed in the first tab 130 after the folding operation. This ensures the tightness of the connection between the welded parts 310 and ensures that the size of the cell structure 10 does not change significantly.

[0103] In one embodiment, both the output connector 340 and the welding component 310 are first nickel sheets to ensure that the operator can complete the folding and welding operations.

[0104] In one embodiment, the thickness of the first nickel sheet is 0.08 mm to 0.3 mm.

[0105] S107. The first tab 130 and the TCO component 300a are fixed by the insulating cover adhesive layer 420 to obtain the cell structure 10 described in any of the above embodiments.

[0106] In one embodiment, the insulating cover adhesive layer 420 is disposed on the insulating encapsulation layer 410 and extends along the length direction of the TCO component 300a to both ends of the bent top sealing edge 121, so as to achieve full coverage and fixation of the TCO component 300a by the insulating cover adhesive layer 420.

[0107] like Figure 10 As shown, in one embodiment, the TCO component 300a is a home-type TCO component 300b. The assembly method of the home-type TCO component 300b includes the following steps: after following steps S101-S106 above, a double-sided adhesive layer is applied to the folded surface of the TCO die 320 of the home-type TCO component 300b, and then the TCO die 320 is gradually folded along the horizontal X direction of the cell 110 so that the output connector 340 of the TCO die 320 can be folded to a preset position. Finally, step S107 is performed to realize the assembly of the home-type TCO component 300b and the cell component 100.

[0108] This disclosure also provides a pouch lithium battery, including the cell structure 10 described in any of the above embodiments, to ensure the stability and compactness of the TCO component 300a connection of the formed pouch lithium battery, thereby ensuring that the overall size of the finally prepared pouch lithium battery does not change significantly, so as to better adapt to some applications with smaller spaces.

[0109] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A battery cell structure (10), characterized in that, include: A battery cell assembly (100) includes a battery cell (110), an encapsulation area (120), and a first tab (130). The encapsulation area (120) is disposed at one end of the battery cell (110) in the height direction. One end of the first tab (130) extends into the encapsulation area (120) and is connected to the battery cell (110). The other end of the first tab (130) is exposed outside the encapsulation area (120). The top sealing edge (121) of the encapsulation area (120) is folded along the width direction of the battery cell (110) to form a bent top sealing edge (121), and the bent top sealing edge (121) is connected to the end of the battery cell (110). The first tab (130) is folded along the width direction of the battery cell (110) to form a bent tab, and the bent tab, the bent top sealing edge (121), and the end of the battery cell (110) together form a mounting cavity (200). The TCO assembly is laid flat on the bent top seal (121); a weldment (310) is formed on one side of the TCO assembly, the weldment (310) is folded and embedded in the mounting cavity (200) along the width direction of the cell (110), and is welded and fixed to the bent electrode tab; Wherein, the width L of the TCO component TCO The following condition I must be satisfied: L1≤L TCO ≤W, L1 is the width of the bent top sealing edge (121), and W is the width of the battery cell (110); The length L2 of the mounting cavity (200) satisfies the following condition II: L2≤W; Insulating fixing components (400) are respectively disposed on the bent electrode tab and the TCO component.

2. The cell structure (10) according to claim 1, characterized in that, The mounting cavity (200) has an opening (210), through which the welded component (310) is folded and fitted into the mounting cavity (200); and / or, The end of the battery cell (110) has a bare arc portion (111) on the side opposite to the folding direction of the bent top seal (121).

3. The cell structure (10) according to claim 1, characterized in that, The top sealing edge (121) is located at a position of 1 / 20-1 / 3 of the width of the cell (110).

4. The cell structure (10) according to claim 1, characterized in that, The TCO assembly includes a TCO die (320), an insulating adhesive layer (330), an output connector (340), and a weldment (310); the TCO die (320) has a horizontal mounting surface (321) for abutting against the bent top seal (121); the output connector (340) and the weldment (310) are both disposed on the same side of the TCO die (320), the extension direction of the output connector (340) is perpendicular to the extension direction of the TCO die (320), and the extension direction of the weldment (310) bends and intersects the extension direction of the TCO die (320); the insulating adhesive layer (330) is disposed on the TCO die (320).

5. The cell structure (10) according to claim 1, characterized in that, The battery cell assembly (100) further includes a fixing adhesive layer (500) disposed between the bent top sealing edge (121) and the end of the battery cell (110).

6. The cell structure (10) according to claim 1, characterized in that, The insulating fixing assembly (400) includes an insulating coating layer (410) and an insulating cover plate adhesive layer (420); the insulating coating layer (410) is disposed at the connection between the bent electrode lug and the welded part (310); the insulating cover plate adhesive layer (420) is disposed on the bent electrode lug and the TCO assembly, and the insulating cover plate adhesive layer (420) is used to fix the bent electrode lug and the TCO assembly.

7. The cell structure (10) according to claim 6, characterized in that, The extending direction of the insulating coating layer (410) is perpendicular to the extending direction of the insulating cover layer (420); and / or, The bent end (411) of the insulating coating layer (410) forms a first folding gap (412) with the welded part (310); and / or, The bent end (411) of the insulating coating layer (410) forms a second folding gap (413) with the first tab (130); and / or, the insulating cover adhesive layer (420) is disposed on the insulating coating layer (410), and the insulating cover adhesive layer (420) extends along the length direction of the TCO assembly to both ends of the bent top seal edge (121).

8. The cell structure (10) according to claim 1, characterized in that, The TCO component is a home-return type TCO component (300b); and / or, The battery cell assembly (100) further includes a second tab (140), which is disposed on one side of the first tab (130). One end of the second tab (140) extends into the encapsulation area (120) and is connected to the battery cell (110). The other end of the second tab (140) is bent and exposed in the encapsulation area (120).

9. A method for assembling a battery cell structure (10), characterized in that, Includes the following steps: Obtain a TCO component and a packaged battery cell (110); wherein, the end of the battery cell (110) is formed with a package area (120) and a first tab (130), the package area (120) includes a top sealing edge (121) and a side sealing edge (122) connected to each other, the first tab (130) is exposed outside the top sealing edge (121), and the width of the top sealing edge (121) is less than or equal to the width of the TCO component; The top sealing edge (121) is folded and fixed to the end of the battery cell (110) along the width direction of the battery cell (110) to form a bent top sealing edge (121); The TCO component is laid flat on the bent top sealing edge (121); The welding part (310) of the TCO component is welded and fixed to the first electrode (130); After welding and fixing, the first electrode tab (130) and the welded part (310) are coated with adhesive to form an insulating coating layer (410) on the surface of the first electrode tab (130) and the welded part (310); Along the width direction of the battery cell (110), the first electrode tab (130) after the coating operation and the welding part (310) are folded simultaneously, so that the folded welding part (310) is embedded in the first electrode tab (130); The first tab (130) and the TCO assembly are fixed by the insulating cover adhesive layer (420) to obtain the cell structure (10) according to any one of claims 1-8.

10. A soft-pack lithium battery, characterized in that, The battery cell structure (10) includes any one of claims 1-8.

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