CN219658934U - Tab connecting assembly and secondary battery - Google Patents

Abstract

The utility model provides a tab connection assembly and a secondary battery, comprising a laminated battery core, wherein at least one pair of tabs are correspondingly arranged on the surfaces of two opposite sides of the laminated battery core; the at least one pair of connecting parts are arranged at one side of the axial extension direction of the at least one pair of lugs, one end of each of the at least one pair of connecting parts is provided with a through window, and the at least one pair of lugs penetrate through the windows on the at least one pair of connecting parts and are abutted and attached to the surfaces, far away from the lamination battery cells, of the at least one pair of connecting parts; the at least one pair of pressing parts are arranged on one side, far away from the laminated battery cell, of the at least one pair of connecting parts, and the at least one pair of pressing parts are propped against the surfaces of the at least one pair of lugs after penetrating through the window; at least one pair of pressing members is detachably connected with at least one pair of connecting members; and the top cover component is arranged in the radial direction of at least one pair of lugs and is arranged at intervals with the lamination battery cells, and the top cover component is fixedly connected with the end parts of at least one pair of connecting components, which are not provided with windows.

Description

Tab connecting assembly and secondary battery

Technical Field

The utility model relates to the technical field of new energy batteries, in particular to a tab connection assembly and a secondary battery.

Background

The new energy automobile is widely accepted by all communities because of the advantages of energy conservation and environmental protection. The power battery is used as an energy source of a new energy automobile, and directly influences the power, reliability and safety of the automobile. Square aluminum-shell batteries have been widely used because of their good packaging reliability, high energy density, and convenient expansion. In order to meet the requirement of quick charge, the battery core of the square aluminum shell battery generally adopts a laminated structure, and the positive electrode tab and the negative electrode tab are generally led out from the same side or opposite sides of the laminated battery core respectively.

CN114491836a discloses a full tab top cover assembly and a full tab battery, wherein tabs are respectively led out from two sides of a laminated battery core, two parallel first pins and two parallel second pins are correspondingly arranged on the side surface of the battery core, and the tabs are arranged in an area between the two first pins or the two second pins in a penetrating manner, but the structure lacks position constraint on the end surfaces of the tabs, and if the feeding length of the tabs is too large, out-of-tolerance is generated in the axial direction of the tabs, and the risk of short circuit between the tabs and a metal shell of the battery core may occur. Therefore, it is necessary to provide a tab connection assembly for limiting and protecting the position of the lateral tab, so as to improve the reliability of the battery cell.

Disclosure of Invention

In view of the above, the present utility model provides a tab connection assembly and a secondary battery capable of sufficiently defining and protecting the position of the tab terminal.

The technical scheme of the utility model is realized as follows:

in one aspect, the utility model provides a tab connection assembly, which comprises a laminated battery cell, wherein at least one pair of tabs are correspondingly arranged on two opposite side surfaces of the laminated battery cell; further comprises:

the at least one pair of connecting parts are respectively arranged at one side of the axial extending direction of the at least one pair of lugs, one end of each of the at least one pair of connecting parts is provided with a through window, and the at least one pair of lugs penetrate through the windows on the at least one pair of connecting parts and are abutted and attached to the surfaces, far away from the lamination battery cells, of the at least one pair of connecting parts;

the at least one pair of pressing parts are arranged on one side, far away from the laminated battery cells, of the at least one pair of connecting parts, and the at least one pair of pressing parts are propped against the surfaces of the at least one pair of lugs after penetrating through the window; at least one pair of pressing members is detachably connected with at least one pair of connecting members;

and the top cover component is arranged in the radial direction of at least one pair of lugs and is arranged at intervals with the lamination battery cells, and the top cover component is fixedly connected with the end parts of at least one pair of connecting components, which are not provided with windows.

On the basis of the above technical solution, preferably, the at least one pair of connecting members each include a first connecting portion and at least one pair of wing plates, the first connecting portion extends along a radial direction of the at least one pair of tabs, a region of the first connecting portion opposite to the at least one pair of tabs is provided with a through window, an edge of the first connecting portion is provided with at least one pair of wing plates, the at least one pair of wing plates are arranged in parallel and at intervals, and the at least one pair of wing plates further extend outwards along a direction away from the first connecting portion; one end of the at least one pair of tabs penetrating through the window is provided with a first bending part, the first bending part is perpendicular to the axial extending direction of the at least one pair of tabs, and the first bending part is propped against the end face of the first connecting part, which is far away from the laminated battery cell, and the end face adjacent to the at least one pair of wing plates.

Preferably, the dimension of the at least one pair of wing plates extending along the axial direction of the window is not smaller than the dimension of the first bending part extending along the axial direction of the window; the at least one pair of wings extends in a radial direction of the window by a dimension not less than a radial dimension of the window.

Preferably, the first connecting part is further provided with a first through hole and at least one second through hole; the at least one pair of pressing parts comprise a base plate, a second connecting part and at least one third connecting part; the substrate is parallel to the first connecting part and is arranged at intervals, the surface of the substrate, which is close to the first connecting part, is abutted against the surface of the first bending part, one end, which is close to the end face of the first connecting part, of the substrate is provided with a second connecting part, and the other end is provided with at least one third connecting part; the second connecting part penetrates through the first through hole and extends towards the side surface direction of the laminated battery cell; the at least one third connecting part penetrates through the at least one second through hole and extends towards the side surface direction of the laminated battery cell; the size of the end part of the second connecting part far away from the substrate is larger than that of the first through hole; the size of the end of the at least one third connecting part far away from the substrate is larger than the size of the at least one second through hole.

Further preferably, the edge of the base plate also abuts against the adjacent surfaces of at least one pair of wings.

Further preferably, the second connecting part further comprises a first flexible supporting part, the first flexible supporting part is arranged at one end, far away from the substrate, of the second connecting part, the outline of the first flexible supporting part is larger than the size of the first through hole, a through clamping groove is formed in the first flexible supporting part, one end, far away from the substrate, of the second connecting part is embedded in the clamping groove, and the surface of the first flexible supporting part is propped against the end face, close to the lamination cell, of the first connecting part.

Further preferably, a second flexible supporting piece is further arranged on the at least one third connecting portion, one end of the second flexible supporting piece is fixedly arranged at one end, far away from the substrate, of the third connecting portion, the other end of the second flexible supporting piece obliquely extends towards the direction close to the substrate, and the second flexible supporting piece is further propped against the end face, close to the lamination cell, of the first connecting portion; the second flexible supporting piece is detachably connected with the third connecting part.

Preferably, the first connecting portion is further provided with a first segment, the first segment is arranged at one end, far away from the window, of the first connecting portion, one end of the first segment is fixedly connected with the first connecting portion, the first segment extends outwards along the radial direction of the window, and the first segment is fixedly connected with the end face, close to the lamination cell, of the top cover component.

Preferably, the at least one pair of wing plates are further provided with second segments respectively, one end of each second segment is fixedly connected with one end of the at least one pair of wing plates away from the first connecting portion, and the other end of each second segment extends outwards along the radial direction of the window.

On the other hand, the utility model also provides a secondary battery, which comprises a shell with an opening at one side, wherein at least one lug connecting assembly is embedded in the opening part of the shell.

Compared with the prior art, the tab connection assembly and the secondary battery provided by the utility model have the following beneficial effects:

(1) The scheme avoids the possibility of over-tolerance or unstable fixation of the electrode lugs of the battery core in the axial length direction, reduces the difficulty and the safety risk of shell entering, and further replaces the materials and the working procedures of attaching the insulating adhesive tape on the surfaces of the electrode lugs;

(2) The pressing part is matched with the connecting part, so that all surfaces of the end part of the tab extending out of the window are locked together, the position of the tab is firmly fixed, and the insulating protection function is realized.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a tab connection assembly and a secondary battery according to the present utility model after being packaged;

fig. 2 is a perspective view illustrating an exploded state of the tab connection assembly and the secondary battery after being packaged according to the present utility model;

FIG. 3 is an exploded perspective view of a connection member, a hold-down member and a cap member of a tab connection assembly of the present utility model;

FIG. 4 is a perspective view of a combination of a connection member and a cover member of a tab connection assembly of the present utility model;

FIG. 5 is a right side view of FIG. 4;

FIG. 6 is a front view of a hold-down member of a tab connection assembly of the present utility model;

FIG. 7 is a perspective view of a first flexible abutment of a tab connection assembly of the present utility model;

FIG. 8 is a perspective view of another combination of a connection member and a cover member of a tab connection assembly of the present utility model;

FIG. 9 is a schematic view showing a combination state of a tab and a laminated cell of a tab connection assembly according to the present utility model;

fig. 10 is a top view illustrating an initial state of a tab connection assembly according to the present utility model.

Reference numerals: 1. lamination cell; 2. a tab; 3. a connecting member; 100. a window; 4. a pressing member; 5. a top cover member; 31. a first connection portion; 32. a wing plate; 200. a first bending part; 300. a first through hole; 400. a second through hole; 41. a substrate; 42. a second connecting portion; 43. a third connecting portion; 421. a first flexible abutment; 431. a second flexible abutment; 500. a first segment; 600. and a second segment.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1, 2, 9 and 10, in one aspect, the present utility model provides a tab connection assembly comprising a laminated cell 1, at least one pair of tabs 2, at least one pair of connection members 3, at least one pair of compression members 4 and a top cover member 5.

At least one pair of lugs 2 are correspondingly arranged on the two opposite side surfaces of the laminated battery cell 1; the laminated battery cell 1 is formed by laminating anode sheets, diaphragms and cathode sheets which are alternately arranged; the tab 2 of this scheme is not drawn forth from the same side of lamination electric core 1, but draws forth respectively from lamination electric core 1's both sides surface orientation respectively, anodal ear and negative pole ear promptly.

The at least one pair of connecting parts 3 are respectively arranged at one side of the axial extending direction of the at least one pair of lugs 2, one end of the at least one pair of connecting parts 3 is provided with a through window 100, and the at least one pair of lugs 2 penetrate through the window 100 on the at least one pair of connecting parts 3 and are abutted and attached on the surface of the at least one pair of connecting parts 3 far away from the laminated battery cell 1; the connection member 3 is used for limiting the cross-sectional shape of the tab 2 and attaching to the tab end of the extension window 100, so as to prevent the possibility of short circuit between the tab 2 and the housing due to the over-tolerance of the dimension.

At least one pair of pressing parts 4 are arranged on one side of the at least one pair of connecting parts 3 away from the laminated battery cell 1, and the at least one pair of pressing parts 4 are abutted against the surfaces of the at least one pair of tabs 2 after passing through the window 100; at least one pair of pressing members 4 is detachably connected with at least one pair of connecting members 3; the pressing part 4 abuts against and presses the surface of the tab extending window 100, so that the relative displacement of the tab 2 relative to the connecting part 3 is prevented, and the position stability of the tab 2 and the laminated battery cell 1 is maintained.

The top cover member 5 is disposed in a radial direction of at least one pair of tabs 2 and spaced apart from the laminated battery cells 1, and the top cover assembly is fixedly connected to an end portion of at least one pair of connection members 3, which is not provided with the window 100. The top cover part 5 is used for forming a channel from the laminated battery core 1, the electrode lugs 2 and the connecting part 3 to the electric energy release, and the top cover part 5 can be further provided with a pole, an explosion-proof valve, a liquid injection hole and other parts, which are not described herein.

As shown in fig. 3, 4 and 5, the connection member 3 has a fitting structure with a plurality of surfaces of the end of the tab 2 in order to better fit and limit the size of the protrusion window 100 of the tab 2. The at least one pair of connecting parts 3 comprise a first connecting part 31 and at least one pair of wing plates 32, the first connecting part 31 extends along the radial direction of the at least one pair of tabs 2, a through window 100 is arranged in the area of the first connecting part 31 opposite to the at least one pair of tabs 2, at least one pair of wing plates 32 are arranged at the edge of the first connecting part 31, the at least one pair of wing plates 32 are arranged in parallel and at intervals, and the at least one pair of wing plates 32 also extend outwards along the direction away from the first connecting part 31; the at least one pair of tabs 2 is provided with a first bending portion 200 at one end penetrating through the window 100, the first bending portion 200 is perpendicular to the axial extending direction of the at least one pair of tabs 2, and the first bending portion 200 is respectively abutted against the end face of the first connecting portion 31, which is far away from the laminated battery core 1, and the end face of the at least one pair of wing plates 32, which is adjacent to each other. The axial extending direction of the tab 2 refers to the direction in which the tab extends linearly and outwardly away from the laminated cell 1. The first bending part 200 is perpendicular to the whole extending direction of the tab 2, and different surfaces of the first bending part 200 are respectively abutted against the surfaces of the first connecting part 31 and the wing plate 32, so that the extending direction of the end part of the tab 2 is changed, and even if part of pole pieces forming the tab 2 are out of tolerance, the pole pieces do not extend towards the direction of the inner surface of the shell of the battery cell, so that the short circuit risk is avoided. Only one window 100 is shown, and after the tab 2 passes through the window 100, the tab extends in a manner of being turned over towards two opposite edges of the window 100, but the number of the windows 100 may be more than one, and a plurality of windows 100 may be arranged on the first connection portion 31 at intervals. As shown in fig. 9 and 10, the first bending portion 200 may be formed by twisting, flattening and bending the end of the tab 2 passing through the window 100.

The dimension of the at least one pair of wings 32 extending along the axial direction of the window 100 is not smaller than the dimension of the first bending portion 200 extending along the axial direction of the window 100; the dimension of at least one pair of paddles 32 extending along the radial direction of the window 100 is not less than the radial dimension of the window 100; with this structure, the surface of the wing plate 32 is sufficiently adapted to the end surface area of the first bending portion 200, and the first bending portion 200 is prevented from exceeding the edge position of the wing plate 32, so as to eliminate the potential short-circuit risk. The wings 32 may be formed of a non-metallic material.

As shown in fig. 2 to 7, for better fitting installation of the pressing member 4, the first connecting portion 31 is further provided with a first through hole 300 and at least one second through hole 400. Correspondingly, the at least one pair of pressing members 4 each include a base plate 41, a second connecting portion 42, and at least one third connecting portion 43; the substrate 41 is parallel to the first connecting portion 31 and arranged at intervals, the surface of the substrate 41 close to the first connecting portion 31 is abutted against the surface of the first bending portion 200, one end of the substrate 41 close to the end face of the first connecting portion 31 is provided with a second connecting portion 42, and the other end of the substrate 41 close to the end face of the first connecting portion 31 is provided with at least one third connecting portion 43; the second connection part 42 passes through the first through-hole 300 and extends toward a side surface direction close to the laminated cell 1; at least one third connection part 43 penetrates through at least one second through hole 400 and extends toward the side surface direction of the laminated cell 1; the size of the end of the second connection portion 42 away from the substrate 41 is larger than the size of the first through hole 300; the size of the end of the at least one third connection portion 43 remote from the substrate 41 is larger than the size of the at least one second through hole 400. The surface of the substrate 41 is used to attach to and abut against a portion of the surface of the first bending portion 200. In order to maintain the posture in which the substrate 41 presses the first bent portion 200, it is further passed through the second connection portion 42 passing through the first through hole 300 and at least one third connection portion 43 passing through the second through hole 400. Here, a means of reducing or varying the cross-sectional size is adopted, that is, the end of the second connection portion 42 is larger than the first through hole, and the end of the third connection portion 43 is larger than the second through hole 400, so that the substrate 41 is kept closely attached to the first bent portion 200 without being separated. At least one pair of the pressing members 4 may be made of a hard insulating material such as polytetrafluoroethylene or phenolic plastic.

As a preferred embodiment, the edge of the base 41 of the present embodiment also abuts against the adjacent surfaces of at least one pair of wings 32. When the base plate 41 abuts against the wing plate 32, the wing plate 32 can play a role of pre-positioning, namely, the area surrounded by the wing plate 32 and the first connecting portion 31 is used for limiting the position of the first bending portion 200, and the area is used for limiting the mounting position of the base plate 41, so that the base plate 41 is prevented from being deviated, and the second connecting portion 42 and the at least one third connecting portion 43 are beneficial to aligning with the first through hole 300 and the at least one second through hole 400, namely, play a role of pre-positioning.

The above-mentioned second connecting portion 42 and at least one third connecting portion 43 may further be detachably connected to the first connecting portion 31, specifically, as shown in fig. 6 and 7, the second connecting portion 42 further includes a first flexible supporting member 421, the first flexible supporting member 421 is disposed at one end of the second connecting portion 42 away from the substrate 41, the profile of the first flexible supporting member 421 is greater than the size of the first through hole 300, a through slot is disposed on the first flexible supporting member 421, one end of the second connecting portion 42 away from the substrate 41 is embedded in the slot, and the surface of the first flexible supporting member 421 is further abutted against the end face of the first connecting portion 31 close to the laminated cell 1. The first flexible supporting member 421 shown in fig. 6 has a cylindrical structure with a circular or oval cross section, and the clamping groove penetrates through the edge of the first flexible supporting member 421 and is matched with the end shape of the second connecting portion 42, so that the end of the second connecting portion 42 approximates to a T-shaped structure, and the contour of the clamping groove is matched with the T-shaped structure, so that even if the end of the second connecting portion 42 is the same as the first through hole 300 in size, a good position locking function can be provided due to the existence of the first flexible supporting member 421, and the thickness of the first flexible supporting member 421 can be set to be basically equal to the thickness of the laminated battery cell 1 without worrying about the separation of the second connecting portion 42 from the first flexible supporting member 421. The first flexible supporting member 421 may be made of a silicone material that does not react with the electrolyte solution.

Similarly, at least one third connecting portion 43 is further provided with a second flexible supporting member 431, one end of the second flexible supporting member 431 is fixedly arranged at one end, far away from the substrate 41, of the third connecting portion 43, the other end of the second flexible supporting member 431 obliquely extends towards the direction approaching the substrate 41, and the second flexible supporting member 431 is further supported against the end face, close to the laminated battery cell 1, of the first connecting portion 31; the second flexible supporting member 431 is detachably connected to the third connecting portion 43. The second flexible supporting member 431 forms an outward extending supporting structure, so that one end of the third connecting portion 43 extending out of the second through hole 400 is prevented from being separated from the first connecting portion 31, when the third connecting portion 43 needs to be installed or detached from the first connecting portion 31, the second flexible supporting member 431 is pressed inwards, the distance between the second flexible supporting member 431 and the second flexible supporting member 431 is reduced, the whole cross section of the third connecting portion 43 and the second flexible supporting member 431 is reduced, and the third connecting portion 43 and the second flexible supporting member 431 can smoothly pass through the second through hole 400, so that the detachable function is realized. The number of the third connection parts 43 may be set as needed.

As shown in fig. 4, for better electrical connection with the top cover member 5 and the pole thereof, the first connection portion 31 is further provided with a first segment 500, the first segment 500 is disposed at an end of the first connection portion 31 far away from the window 100, one end of the first segment 500 is fixedly connected with the first connection portion 31, the first segment 500 extends outwards along the radial direction of the window 100, and the first segment 500 is fixedly connected with an end surface of the top cover member 5 close to the laminated cell 1. The first segment 500 is shown disposed at an angle to the first connection 31, and more preferably at a right angle.

As shown in fig. 8, in addition to the above technical solution, it is further preferable that, in order to further provide the second segments 600 on the at least one pair of wing plates 32, one end of the second segment 600 is fixedly connected to one end of the at least one pair of wing plates 32 away from the first connecting portion 31, and the other end of the second segment 600 extends outward along the radial direction of the window 100. The provision of the second segment 600 can increase the contact area between the edge of the wing plate 32 and the inner surface of the case of the battery cell, and further stabilize the postures of the wing plate 32 and the first connection portion 31.

In addition, referring to fig. 1, the present utility model further provides a secondary battery, which includes a case having an opening at one side, and at least one tab connection assembly as described above is embedded in the opening of the case.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. The utility model provides a tab connection assembly, includes lamination electric core (1), and the relative both sides surface of lamination electric core (1) is provided with at least a pair of tab (2) respectively; characterized by further comprising:

the at least one pair of connecting parts (3) are respectively arranged at one side of the axial extending direction of the at least one pair of lugs (2), one end of the at least one pair of connecting parts (3) is provided with a through window (100), and the at least one pair of lugs (2) penetrate through the window (100) on the at least one pair of connecting parts (3) and are abutted and attached to the surface, far away from the laminated battery cell (1), of the at least one pair of connecting parts (3);

at least one pair of pressing parts (4) arranged on one side of the at least one pair of connecting parts (3) far away from the laminated battery cell (1), wherein the at least one pair of pressing parts (4) are abutted against the surfaces of the at least one pair of lugs (2) after passing through the window (100); at least one pair of pressing parts (4) is detachably connected with at least one pair of connecting parts (3);

the top cover component (5) is arranged in the radial direction of at least one pair of lugs (2) and is arranged at intervals with the laminated battery cells (1), and the top cover component is fixedly connected with the end parts of at least one pair of connecting components (3) which are not provided with windows (100).

2. A tab connection assembly according to claim 1, wherein the at least one pair of connection members (3) each comprise a first connection portion (31) and at least one pair of wings (32), the first connection portion (31) extending in a radial direction of the at least one pair of tabs (2), the first connection portion (31) being provided with a through window (100) in a region facing the at least one pair of tabs (2), the first connection portion (31) being provided at its edge with at least one pair of wings (32), the at least one pair of wings (32) being arranged in parallel and spaced apart relation, the at least one pair of wings (32) further extending outwardly in a direction away from the first connection portion (31); one end of at least one pair of tabs (2) penetrating through the window (100) is provided with a first bending part (200), the first bending part (200) is perpendicular to the axial extending direction of the at least one pair of tabs (2), and the first bending part (200) is abutted against the end face, far away from the laminated battery cell (1), of the first connecting part (31) and the adjacent end face of the at least one pair of wing plates (32) respectively.

3. The tab connection assembly according to claim 2, wherein the dimension of the at least one pair of wing plates (32) extending along the axial direction of the window (100) is not smaller than the dimension of the first bending portion (200) extending along the axial direction of the window (100); the at least one pair of wings (32) extends in the radial direction of the window (100) by a dimension not less than the radial dimension of the window (100).

4. A tab connection assembly according to claim 2, wherein the first connection portion (31) is further provided with a first through hole (300) and at least one second through hole (400); the at least one pair of pressing members (4) each comprise a base plate (41), a second connecting portion (42) and at least one third connecting portion (43); the substrate (41) is parallel to the first connecting part (31) and is arranged at intervals, the surface of the substrate (41) close to the first connecting part (31) is abutted against the surface of the first bending part (200), one end of the substrate (41) close to the end face of the first connecting part (31) is provided with a second connecting part (42), and the other end is provided with at least one third connecting part (43); the second connecting part (42) passes through the first through hole (300) and extends towards the side surface direction of the laminated battery cell (1); at least one third connecting portion (43) penetrates through the at least one second through hole (400) and extends towards the side surface direction of the laminated battery cell (1); the size of the end part of the second connecting part (42) far away from the substrate (41) is larger than that of the first through hole (300); the dimension of the end of the at least one third connection portion (43) remote from the substrate (41) is larger than the dimension of the at least one second through hole (400).

5. A tab connection assembly according to claim 4, wherein the edge of the base plate (41) also abuts against the adjacent surfaces of at least one pair of wings (32).

6. The tab connection assembly according to claim 4, wherein the second connection portion (42) further comprises a first flexible supporting member (421), the first flexible supporting member (421) is disposed at one end of the second connection portion (42) far away from the substrate (41), the outline of the first flexible supporting member (421) is larger than the size of the first through hole (300), a through clamping groove is formed in the first flexible supporting member (421), one end of the second connection portion (42) far away from the substrate (41) is embedded in the clamping groove, and the surface of the first flexible supporting member (421) abuts against the end face, close to the laminated cell (1), of the first connection portion (31).

7. The tab connection assembly according to claim 4, wherein a second flexible supporting member (431) is further disposed on the at least one third connection portion (43), one end of the second flexible supporting member (431) is fixedly disposed at one end of the third connection portion (43) far away from the substrate (41), the other end of the second flexible supporting member (431) obliquely extends toward a direction approaching the substrate (41), and the second flexible supporting member (431) is further abutted against an end face of the first connection portion (31) near the laminated battery cell (1); the second flexible supporting piece (431) is detachably connected with the third connecting part (43).

8. The tab connection assembly according to claim 2, wherein the first connection portion (31) is further provided with a first segment (500), the first segment (500) is disposed at one end of the first connection portion (31) away from the window (100), one end of the first segment (500) is fixedly connected with the first connection portion (31), the first segment (500) extends outwards along a radial direction of the window (100), and the first segment (500) is fixedly connected with an end face of the top cover member (5) close to the laminated battery cell (1).

9. The tab connection assembly according to claim 2, wherein the at least one pair of wing plates (32) are further provided with second segments (600), respectively, one end of each second segment (600) is fixedly connected to one end of the at least one pair of wing plates (32) away from the first connection portion (31), and the other end of each second segment (600) extends outwards along the radial direction of the window (100).

10. A secondary battery comprising a case having an opening at one side, wherein at least one tab connection assembly according to any one of claims 1 to 9 is embedded in the opening portion of the case.