Lithium battery composite assembly

Abstract

The invention relates to a lithium battery composite assembly. The lithium battery composite assembly comprises a top cover sheet, an adapter sheet, two roll cores and an insulating plastic part, at least two pairs of tabs are arranged at the opposite end parts of the two roll cores, each pair of tabs is provided with an adapter plate, and each tab comprises a tab connecting plate and a tab bending plate. Each pair of tab connecting sheets is connected to the surface of one side of the corresponding adapter sheet, and a gap is formed between each pair of tab bending sheets and the corresponding adapter sheet; and the top cover sheet is connected to the surface of the other side, deviating from the tab, of the adapter sheet. The insulating plastic part is arranged between the end parts of the two roll cores and comprises a continuous insulating section and a roll core press-fitting part. And the connecting insulating section is arranged in the gap between the tab bending sheet and the switching sheet of each pair of tabs in each gap, so that the insulation between the tab bending sheet and the switching sheet is ensured, and the contact between the tab bending sheet and the switching sheet is avoided. The roll core press-fitting parts are arranged at the two ends of the continuous insulation section and used for separating the ends of the roll cores from the top cover piece and pressing the roll cores to prevent the roll cores from shaking.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery structures, and in particular to a lithium battery composite assembly. Background Art

[0002] With the development of lithium battery technology, general lithium batteries need to connect the tabs with ultrasonic welding, and then connect the adapter and the top cover pole by laser welding. Insulation design is required in these two tab connection areas to avoid mutual influence. Conventionally, adhesive tape is used to achieve insulation, but the adhesive process is cumbersome and increases design costs. In addition, adhesive tape takes up wiring space and cannot adapt to high temperature scenarios during welding, which ultimately causes damage to the internal structure of the lithium battery. Summary of the invention

[0003] Based on this, it is necessary to provide a lithium battery composite assembly to address the insulation problem at the welding position of the lithium battery.

[0004] A lithium battery composite assembly, comprising a top cover sheet, a transfer sheet, two winding cores and an insulating plastic part; at least two pairs of pole ears are arranged at opposite ends of the two winding cores, each pair of pole ears is equipped with a transfer sheet, and the pole ears include a pole ear connecting sheet and a pole ear bending sheet; each pair of pole ear connecting sheets is connected to a side surface of the corresponding transfer sheet, and a gap is arranged between each pair of pole ear bending sheets and the corresponding transfer sheet; the top cover sheet is connected to the other side surface of the transfer sheet away from the pole ear;

[0005] The insulating plastic part is arranged between the ends of the two winding cores, and includes: a continuous insulating section and a winding core pressing part arranged at both ends of the continuous insulating section; the continuous insulating section is arranged in the gap between all the tab bending pieces and the adapter pieces; the winding core pressing part is used to separate the winding core end and the top cover piece.

[0006] In one embodiment, the winding core includes an unfolded state and a closed state;

[0007] In the unfolded state, the ends of the two winding cores are arranged opposite to each other, and the continuous insulating section covers the surface of the tab connecting piece away from the adapter piece;

[0008] In the core-closed state, the ends of the two winding cores are arranged toward the top cover sheet; the two sides of the continuous insulating section support the opposite end faces of each pair of pole ears; and the winding core pressing part is used to fill the gap between the winding core ends and the top cover sheet.

[0009] In one embodiment, the top cover sheet includes a base plate and a pole opened on the base plate, and the pole is connected to the adapter sheet;

[0010] An assembly column is arranged on the end surface of the roll core pressing part facing the top cover sheet, and an assembly hole is correspondingly opened on the base plate, and the assembly column and the assembly column are installed in coordination.

[0011] In one embodiment, in the unfolded state, the outer side of the tab bending piece is connected to the end of the winding core, the inner side of the tab bending piece is spaced apart from the inner side of the tab connecting piece, and the outer side of the tab connecting piece is welded to the surface of the adapter;

[0012] In the core-closed state, the inner side surface of the tab bending piece moves toward the inner side surface of the tab connecting piece until it contacts the continuous insulating section.

[0013] In one embodiment, the continuous insulating section is configured as a rectangle, and two winding core pressing parts are respectively disposed at two ends of the rectangular continuous insulating section. The rectangular continuous insulating section can support each pair of pole ears disposed along its length direction.

[0014] In one embodiment, a spacing gap is provided between each pair of tabs at the ends of the winding core, and a continuous insulating section passes through the spacing gap and is arranged in the gap between each tab bending piece and the adapter piece.

[0015] In one of the embodiments, the top cover sheet further includes an explosion-proof valve, and an explosion-proof valve protection shell is provided on the continuous insulating section corresponding to the explosion-proof valve.

[0016] In one embodiment, the thickness of the core pressing portions on both sides is consistent and greater than the thickness of the continuous insulating section.

[0017] In one of the embodiments, a safety distance is provided between the core pressing portion and the tab.

[0018] In one of the embodiments, an aluminum shell is further included, and the aluminum shell is used to wrap the outer side of the winding core and the top cover sheet in the closed state.

[0019] A lithium battery composite assembly includes a top cover sheet, a transfer sheet, two winding cores and an insulating plastic part. At least two pairs of pole ears are arranged at the opposite ends of the two winding cores, each pair of pole ears is equipped with a transfer sheet, and the pole ears include a pole ear connecting sheet and a pole ear bending sheet. Each pair of pole ear connecting sheets is connected to one side surface of the corresponding transfer sheet, and a gap is arranged between each pair of pole ear bending sheets and the corresponding transfer sheet; the top cover sheet is connected to the other side surface of the transfer sheet away from the pole ear. The above-mentioned lithium battery composite assembly structure also includes an insulating plastic part arranged between the ends of the two winding cores, and the insulating plastic part includes: a continuous insulating section and a winding core pressing part. The continuous insulating section is arranged in the gap between the pole ear bending sheet and the transfer sheet, and each pair of pole ears will form a gap between the pole ear bending sheet and the transfer sheet. The connecting insulating section is arranged in each gap to ensure the insulation between each pole ear bending sheet and the transfer sheet to avoid contact between the two. The above-mentioned winding core pressing part is arranged at both ends of the continuous insulating section, and the winding core pressing part is used to separate the winding core end and the top cover sheet. The continuous insulating section will ensure that the non-welded conductive area of ​​the tab, that is, the tab bending piece will not contact any part of the adapter sheet, tab connecting sheet and top cover sheet in any state of the lithium battery, thereby avoiding internal short circuit caused by the tab bending piece. The core pressing section ensures that the adapter sheet and the top cover sheet do not come into contact with each other except for the welding position during the entire core assembly process, thereby achieving insulation between the two. In addition, the core pressing section also fills the gap between the adapter sheet and the top cover sheet, which can prevent the core structure from shaking after assembling the aluminum shell of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a schematic diagram of the structural assembly of a lithium battery composite assembly in an embodiment of the present application in an unfolded state.

[0021] FIG. 2 is a schematic diagram of the structure of a plastic insulating member in an embodiment of the present application.

[0022] FIG3 is a side cross-sectional view of the lithium battery composite assembly in an embodiment of the present application in an unfolded state.

[0023] FIG. 4 is a side cross-sectional view of the lithium battery composite assembly in the embodiment of the present application in a closed state.

[0024] FIG. 5 is a schematic diagram of the structural assembly of the lithium battery composite assembly in the embodiment of the present application after the winding core is removed in the closed state.

[0025] FIG. 6 is a schematic diagram of the structure of a lithium battery composite assembly in an embodiment of the present application in a closed state.

[0026] FIG. 7 is a schematic structural diagram of the plastic insulating member in the embodiment of the present application from another perspective.

[0027] Figure Number:

[0028] 1-top cover piece, 2-adapter piece, 3-winding core, 4-ear, 5-ear connecting piece, 6-ear bending piece, 7-insulating plastic part, 8-continuous insulating section, 9-winding core pressing part, 10-base plate, 11-pole, 12-assembly column, 13-assembly hole, 14-explosion-proof valve protective shell. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0035] Referring to FIG. 1 and FIG. 2, FIG. 1 is a schematic diagram of the structural assembly of the lithium battery composite assembly in the embodiment of the present application in the unfolded state. FIG. 2 is a schematic diagram of the structure of the plastic insulating part in the embodiment of the present application, showing a lithium battery composite assembly, including a top cover sheet 1, a transfer sheet 2, two winding cores 3 and an insulating plastic part 7. At least two pairs of pole ears 4 are arranged at the opposite ends of the two winding cores 3, and each pair of pole ears 4 is equipped with a transfer sheet 2, and the pole ears 4 include a pole ear connecting sheet 5 and a pole ear bending sheet 6. Each pair of pole ear connecting sheets 5 is connected to one side surface of the corresponding transfer sheet 2, and a gap is arranged between each pair of pole ear bending sheets 6 and the corresponding transfer sheet 2; the top cover sheet 1 is connected to the other side surface of the transfer sheet 2 away from the pole ear 4. The two winding cores 3 are electrically connected to the transfer sheet 2 through the pole ears 4 arranged at the ends, and then electrically connected to the pole 11 of the top cover sheet 1 through the transfer sheet 2, thereby realizing the battery function. Among them, it is foreseeable that the top cover sheet 1, the adapter sheet 2 and the two winding cores 3 can all be loaded into the aluminum shell of the lithium battery containing electrolyte after the winding cores are closed. The method of assembling the above structure into the aluminum shell can be set according to the existing lithium battery technology.

[0036] The lithium battery composite assembly structure further includes an insulating plastic part 7 disposed between the ends of the two winding cores 3, and the insulating plastic part 7 includes: a continuous insulating section 8 and a winding core pressing portion 9. The continuous insulating section 8 is disposed in the gap between the tab bending piece 6 and the adapter piece 2, and each pair of tabs 4 will form a gap between the tab bending piece 6 and the adapter piece 2, and the connecting insulating section 8 is disposed in each gap to ensure insulation between each tab bending piece 6 and the adapter piece 2 to prevent the two from contacting.

[0037] The core pressing parts 9 are arranged at both ends of the continuous insulating section 8 , and the core pressing parts 9 are used to separate the ends of the core 3 from the top cover sheet 1 .

[0038] In one embodiment of the present application, the core 3 includes an unfolded state and a closed state. The core 3 in the closed state can be assembled into the aluminum shell of the lithium battery. The unfolded state refers to the cores 3 on both sides being spread out flat. At this time, the tabs 4 are correspondingly connected to the adapter 2, and the tab bending pieces 6 have not yet been retracted inwardly along with the core 3. At this time, the gap between the tab bending pieces 6 and the tab connecting pieces 5 can be used for the insulating plastic part 7 to be installed. The closed state refers to the cores 3 on both sides approaching each other until the opposite end faces are fitted together. During the whole process, the tab bending pieces 6 will be brought to the middle by the core 3 and will also clamp the continuous insulating section 8 set in the gap between the tab bending pieces 6 and the tab connecting pieces 5.

[0039] Referring to FIG. 3 , FIG. 3 is a side cross-sectional view of the lithium battery composite assembly in the embodiment of the present application in the unfolded state, in which the ends of the two winding cores 3 are arranged opposite to each other when the winding core 3 is in the unfolded state, and the outer side of the pole tab connecting piece 5 is welded to the adapter 2, and the inner side of the pole tab bending piece 6 has not yet been bent toward the side surface close to the pole tab connecting piece 5. In the unfolded state, the insulating plastic part 7 can be placed between the ends of the two winding cores 3, and the continuous insulating section 8 of the insulating plastic part 7 covers the surface of the pole tab connecting piece 5 away from the adapter 2.

[0040] Referring to Figures 4 to 6, Figure 4 is a side cross-sectional view of the lithium battery composite assembly in the embodiment of the present application in the core-closed state. Figure 5 is a schematic diagram of the structural assembly of the lithium battery composite assembly in the embodiment of the present application after the winding core is removed in the core-closed state. Figure 6 is a schematic diagram of the structure of the lithium battery composite assembly in the embodiment of the present application in the core-closed state, showing that in the core-closed state, the two winding cores 3 are inwardly attached, the winding core 3 pushes out one end of the pole ear 4, and the ends of the two winding cores 3 are arranged toward the top cover sheet 1. The pole ear bending piece 6 is folded toward the square close to the pole ear connecting piece 5, and the two sides of the continuous insulating section 8 support the opposite end faces of each pair of pole ears 4, thereby supporting and guiding the pole ear bending piece 6, ensuring that the pole ear bending piece 6 is folded in an orderly manner. The winding core pressing part 9 located at the end of the continuous insulating section 8 is used to fill the gap between the end of the winding core 3 and the top cover sheet 1 after the core is closed. At this time, the end of the winding core 3 faces the top cover sheet 1, and is installed in the aluminum shell of the lithium battery according to this assembly form. When there is a gap between the end of the winding core 3 and the top cover sheet 1, it will cause the internal structure to shake, so the thickness of the winding core pressing part 9 needs to fill the gap to keep the structure stably assembled.

[0041] In one embodiment of the present application, the top cover sheet 1 includes a substrate 10 and a pole 11 opened on the substrate 10 , and the pole 11 is electrically connected to the adapter sheet 2 accordingly.

[0042] Refer to Figure 7, which is a schematic diagram of the structure of the plastic insulating part in the embodiment of the present application from another perspective, showing that an assembly column 12 is provided on the end surface of the core pressing portion 9 facing the top cover sheet 1, and an assembly hole 13 is correspondingly opened on the base plate 10, and the assembly column 12 is installed in coordination with the assembly hole 13. The insulating plastic part 7 is arranged as a separate, detachable matching structure with the top cover sheet 1 through the position of the core pressing portion 9, and the insulating plastic part 7 can be replaced independently, thereby saving the use cost. The assembly column 12 and the assembly hole 13 can be assembled by controlling the interference or draft angle of the matching section. The specific setting method can refer to the prior art and will not be elaborated in this article.

[0043] In one embodiment of the present application, the winding core 3 is in the unfolded state, the outer side surface of the pole ear bending piece 6 is connected to the end of the winding core 3, the inner side surface of the pole ear bending piece 6 is spaced apart from the inner side surface of the pole ear connecting piece 5, the outer side surface of the pole ear connecting piece 5 is welded to the surface of the adapter piece 2, the pole ear connecting piece 5 is used to achieve electrical connection, and the pole ear bending piece 6 belongs to the non-connection area, and needs to always keep insulated and separated from the adapter piece 2 and the top cover piece 1 to avoid internal short circuit.

[0044] When the winding core 3 is in the core-closing state, the inner side of the tab bending piece 6 moves toward the inner side of the tab connecting piece 5, and the continuous insulating section 8 serves as a supporting edge for the tab bending piece 6 to bend during the core-closing process until the tab bending piece 6 contacts the continuous insulating section 8 to complete the core-closing. During the entire core-closing process, the continuous insulating section 8 supports the tab bending piece 6, thereby achieving the effect of assisting the closing.

[0045] During the actual assembly, the ends of the two winding cores 3 are first arranged correspondingly, and then the corresponding tabs 4 on the ends of the winding cores 3 are ultrasonically connected and welded to the adapter sheet 2. Specifically, the outer side of the tab connection sheet 5 of each pair of tabs 4 is welded to the surface of a corresponding adapter sheet 2 to form an electrical connection. Then, the side of the adapter sheet 2 facing away from the tab connection sheet 5 is welded to the pole 11 of the top cover sheet 1 to form an electrical connection.

[0046] After the top cover sheet 1 is configured, the insulating plastic part 7 is placed between the ends of the two winding cores 3, so that the continuous insulating section 8 covers the inner side of all the tab connection sheets 5, and the ends of the continuous insulating section 8 extend outward along its own length to the outside of the welding positions of all the tabs 4. The winding core pressing part 9 at the end of the continuous insulating section 8 is provided with an assembly column 12 on the surface facing the top cover sheet 1, and the winding core pressing part 9 is positioned by the assembly column 12 and the assembly hole 13 on the base plate 10 of the top cover sheet 1.

[0047] After the insulating plastic part 7 and the top cover sheet 1 are assembled, the core 3 can be changed from the unfolded state to the closed state. During the closing process, the two cores 3 are close to each other, and the tab bending pieces 6 of the tabs 4 on both sides will follow the core 3 to move towards each other. At this time, the two side edges of the insulating plastic part 7 covering the tab connecting sheet 5 will serve as the bending support edges of the tab bending piece 6 relative to the tab connecting sheet 5, thereby guiding the moving direction of the tab bending piece 6 and providing support to the tab bending piece 6 during the closing process, reducing the risk of the tab 4 being inserted into the core 3. During the closing process, the core 3 pushes out the tab 4, and the core pressing part 9 will be gradually moved to the gap between the end of the core 3 and the substrate 10 of the top cover sheet 1. When the cores 3 on both sides are closed, one side surface of the core pressing part 9 supports the inner wall of the top cover sheet 1, and the other surface of the core pressing part 9 supports the end face of the core 3. The tab bending pieces 6 on both sides are also folded inwards until they are in contact with the surface of the continuous insulating section 8. The continuous insulating section 8 will ensure the non-welded conductive area of ​​the tab 4, that is, the tab bending piece 6 will not contact any part of the adapter sheet 2, the tab connecting sheet 4 and the top cover sheet 1 in any state of the lithium battery, thereby avoiding internal short circuit caused by the tab bending piece 6.

[0048] At the same time, the core pressing part 9 ensures that the adapter sheet 2 and the top cover sheet 1 have no contact except the welding position during the entire core assembly process, thereby achieving insulation between the two. In addition, the core pressing part 9 also fills the gap between the two, and after the aluminum shell of the lithium battery is installed, the structural shaking of the core 3 can be avoided.

[0049] In one embodiment of the present application, the above-mentioned continuous insulating segment 8 is arranged in a rectangular shape, and the rectangular continuous insulating segment 8 extends along its own length to the outside of all the paired pole ears 4, and the two winding core pressing parts 9 are respectively arranged on the same surface at both ends of the rectangular continuous insulating segment 8.

[0050] The rectangular continuous insulating section 8 can support each pair of pole tabs 4 arranged along its length direction, and the two side edges of the rectangle serve as bending support edges of the pole tab bending pieces 6 to assist the pole tabs 4 in closing.

[0051] In one embodiment of the present application, each pair of pole tabs 4 is provided with a spacing gap between the ends of the winding core 3, and the spacing gap ensures that the structures of the pole tabs 4 do not affect each other. The continuous insulating segment 8 passes through the spacing gap and is arranged in the gap between each pole tab bending piece 6 and the adapter plate 2, thereby supporting the spacing gap to prevent the pole tab bending piece 6 from shifting during the core assembly process.

[0052] In one embodiment of the present application, the top cover sheet 1 further includes an explosion-proof valve, and an explosion-proof valve protective shell 14 is provided on the continuous insulating section 8 corresponding to the explosion-proof valve. After the insulating plastic part 7 is assembled, the explosion-proof valve protective shell 14 covers the outside of the explosion-proof valve. The specific structure of the explosion-proof valve protective shell 14 can be set with reference to the prior art, and will not be expanded in this article.

[0053] In one embodiment of the present application, the thickness of the core pressing parts 9 on both sides is consistent and greater than the thickness of the continuous insulating section 8. The continuous insulating section 8 is used to fill the gap between the tab bending piece 6 and the tab connecting piece 5. The continuous insulating section 8 extends to the two ends of the area where the tab 4 is set, so that the core pressing part 9 fills the gap between the end of the core 3 and the top cover sheet 1, which is used to press the core 3 to prevent it from shaking.

[0054] In one embodiment of the present application, a safety distance is provided between the core pressing portion 9 and the tab 4. When the core 3 is closed, the structures of the tab 4 will be close to each other, and it is necessary to ensure that there is a safety distance between the core installation portion 9 and the active range of the tab 4 to avoid mutual influence of the structures. At the same time, it is also necessary to control the safety distance not to be too large to avoid shaking caused by insufficient filling of the plastic insulating part 7 after installation.

[0055] In one embodiment of the present application, the lithium battery further includes an aluminum shell, which is used to wrap the outer side of the winding core 3 and the top cover sheet 1 in the closed state. The specific shape of the aluminum shell can be changed according to the actual needs of the lithium battery, and will not be elaborated in this article.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A lithium battery composite assembly, characterized in that: It comprises a top cover sheet, a transfer sheet, two winding cores and an insulating plastic part; at least two pairs of pole ears are arranged at opposite ends of the two winding cores, each pair of the pole ears is equipped with a transfer sheet, and the pole ears include a pole ear connecting sheet and a pole ear bending sheet; each pair of the pole ear connecting sheets is connected to a side surface of the corresponding transfer sheet, and a gap is arranged between each pair of the pole ear bending sheets and the corresponding transfer sheet; The top cover sheet is connected to the other side surface of the adapter sheet away from the pole ear; The insulating plastic part is arranged between the ends of the two winding cores, and comprises: a continuous insulating section and a winding core pressing part arranged at both ends of the continuous insulating section; The continuous insulating section is arranged in the gaps between all the tab bending pieces and the adapter pieces; the winding core pressing portion is used to separate the winding core end and the top cover piece.

2. The lithium battery composite assembly according to claim 1, characterized in that: The winding core includes an unfolded state and a closed state; In the unfolded state, the ends of the two winding cores are arranged opposite to each other, and the continuous insulating section covers the surface of the tab connecting sheet facing away from the adapter sheet; In the core-closed state, the ends of the two winding cores are arranged toward the top cover sheet; the two sides of the continuous insulating section support the opposite end faces of each pair of pole ears; and the winding core pressing portion is used to fill the gap between the end of the winding core and the top cover sheet.

3. The lithium battery composite assembly according to claim 1, characterized in that: The top cover sheet includes a pole connected to the base plate and opened on the base plate, and the pole is connected to the adapter sheet; An assembly column is arranged on the end surface of the roll core pressing part facing the top cover sheet, and an assembly hole is correspondingly opened on the base plate, and the assembly column is installed in cooperation with the assembly column.

4. The lithium battery composite assembly according to claim 2, characterized in that: In the unfolded state, the outer side surface of the tab bending piece is connected to the end of the winding core, the inner side surface of the tab bending piece is spaced apart from the inner side surface of the tab connecting piece, and the outer side surface of the tab connecting piece is welded to the surface of the adapter; In the core-closed state, the inner side surface of the tab bending piece moves toward the inner side surface of the tab connecting piece until it contacts the continuous insulating section.

5. The lithium battery composite assembly according to claim 1, characterized in that: The continuous insulating section is arranged in a rectangular shape, and the two winding core pressing parts are respectively arranged at two ends of the rectangular continuous insulating section. The rectangular continuous insulating section can support each pair of the pole ears arranged along its own length direction.

6. The lithium battery composite assembly according to claim 1, characterized in that: Each pair of the tabs is provided with a spacing gap between the ends of the winding core, and the continuous insulating section passes through the spacing gap and is arranged in the gap between each tab bending piece and the adapter piece.

7. The lithium battery composite assembly according to claim 1, characterized in that: The top cover sheet also includes an explosion-proof valve, and an explosion-proof valve protection shell is provided on the continuous insulating section corresponding to the explosion-proof valve.

8. The lithium battery composite assembly according to claim 1, characterized in that: The thickness of the core pressing parts on both sides is consistent and greater than the thickness of the continuous insulating section.

9. The lithium battery composite assembly according to claim 1, characterized in that: A safety distance is arranged between the winding core pressing portion and the pole lug.

10. The lithium battery composite assembly according to claim 2, characterized in that: It also includes an aluminum shell, which is used to wrap the outer side of the winding core and the top cover sheet in the core-closed state.

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