Electric connection sheet, top cover assembly and battery cell

Abstract

The utility model discloses an electric connecting piece, a top cover assembly and a battery cell. The electric connecting piece comprises a welding part, a first connecting part, a second connecting part, a third connecting part and an electric connecting part, the welding part is used for being in welding connection with the end part of the pole, and the welding part is provided with a welding surface parallel to the plane of the end part of the pole; the edge of the welding part is bent and extends in a direction deviating from the welding surface to form a first connecting part; the edge, deviating from the welding part, of the first connecting part bends and extends outwards in the direction parallel to the welding surface to form a second connecting part; the edge, deviating from the first connecting part, of the second connecting part is bent and extends towards the welding surface to form a third connecting part; and the electric connecting part is connected with the edge, deviating from the second connecting part, of the third connecting part. By improving the structure of the electric connecting sheet, the electric connecting sheet is prevented from being deformed in the welding process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium battery more particularly, relate to a kind of electric connecting sheet, top cover assembly and electric core. BACKGROUND

[0002] Lithium battery is widely used in power battery, energy storage battery and other technical fields, and the power battery provides power source for tool, usually provides power for electric car, electric train, electric bicycle, golf cart and the like, and is the core component of new energy vehicle etc. Energy storage battery is often used in household energy storage, solar and wind power generation equipment power station, portable power supply, communication base station and the like, and renewable energy storage energy storage battery. The application scenarios of the two are different, and their performance and design are different.

[0003] The above-mentioned battery usually includes a plurality of electric cores, and the plurality of electric cores are connected in series or parallel to form a battery module. The electric core is the smallest unit of the battery module. The electric core includes a shell for accommodating electrolyte and lithium battery positive and negative electrode materials, and a top cover assembly sealing the opening of the shell. The top cover assembly includes a top cover sheet and a lower insulating sheet attached to the inner surface of the top cover sheet. The electrode passes through the top cover sheet and the lower insulating sheet. One end of the electrode is located inside the electric core for electrical connection with the tab inside the electric core. The other end of the electrode is located outside the electric core for parallel or series connection with other electric cores.

[0004] The electrode includes a pole that extends out of the top cover assembly and an electric connecting sheet that is connected to the end of the pole inside the electric core. The electric connecting sheet is used to connect the pole and the tab. The electric connecting sheet is connected to the pole by welding. In the prior art, the electric connecting sheet has a planar structure. During the welding process of the electric connecting sheet and the pole, deformation occurs, the flatness cannot meet the requirements, and the poor welding rate increases. UTILITY MODEL CONTENTS

[0005] The utility model aims to overcome the above-mentioned defects existing in the prior art, and provide an electric connecting sheet, a top cover assembly and an electric core. By improving the structure of the electric connecting sheet, deformation of the electric connecting sheet during welding is prevented.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] An electric connecting sheet includes:

[0008] A welding portion is used for welding connection with the end of the pole. The welding portion has a welding surface parallel to the end plane of the pole.

[0009] A first connecting portion is formed by bending and extending the edge of the welding portion away from the welding surface.

[0010] A second connecting portion, an edge of the first connecting portion away from the welding portion is bent and extended outwardly along a direction parallel to the welding surface to form the second connecting portion;

[0011] A third connecting portion, an edge of the second connecting portion away from the first connecting portion is bent and extended toward the welding surface to form the third connecting portion;

[0012] An electric connecting portion, connected with an edge of the third connecting portion away from the second connecting portion, used for electrically connecting with a tab.

[0013] The utility model discloses still a kind of top cover assembly, including above-mentioned electric connecting sheet.

[0014] The utility model discloses still a kind of electric core, including above-mentioned top cover assembly.

[0015] Implement the utility model embodiment, with following beneficial effects:

[0016] The utility model embodiment is bent and extended to the direction away from pole by setting first connecting portion, so that when welding welding portion, the reverse bending of first connecting portion can avoid welding surface deformation;First connecting portion, second connecting portion and third connecting portion form the groove with opening towards pole, and the groove can buffer the tension of welding local deformation, guarantee the flatness of electric connecting portion, and the groove can also buffer the deformation tension of thermal expansion and cold shrink, so that the connection of electric connecting piece is more stable, and second connecting portion can also collect welding slag. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0018] Among them:

[0019] Figure 1 It is the structure schematic view of electric connecting sheet of a specific embodiment of the utility model.

[0020] Figure 2 It is Figure 1 The cross-sectional structure schematic view of electric connecting sheet shown.

[0021] Figure 3 It is the partial cross-sectional structure schematic view of top cover assembly of a specific embodiment of the utility model.

[0022] In the figure, 10, an electric connecting sheet; 11, a welding part; 111, a welding surface; 12, a first connecting part; 121, a groove; 13, a second connecting part; 14, a third connecting part; 15, an electric connecting part; 20, a top cover sheet; 21, a convex section; 22, a lower ring; 30, a lower insulating part; 31, a first abutting part; 32, a second abutting part; 33, a third abutting part; 40, a pole; 41, a pressing part; 50, an upper insulating part; 60, a sealing part. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0024] Reference Figure 1 And Figure 2 The utility model discloses an electric connecting sheet 10, including welding part 11, first connecting part 12, second connecting part 13, third connecting part 14 and electric connecting part 15. The welding part 11 is used to be connected with the end of pole 40 welding, and the welding part 11 has the welding surface 111 parallel with the end plane of pole 40, and the edge of welding part 11 extends in the direction of deviating from the welding surface 111 and forms the first connecting part 12, and the edge of first connecting part 12 deviating from the welding part 11 extends in the direction parallel with the welding surface 111 and forms the second connecting part 13, and the edge of second connecting part 13 deviating from the first connecting part 12 extends in the direction towards the welding surface 111 and forms the third connecting part 14, and electric connecting part 15 is connected with the edge of third connecting part 14 deviating from the second connecting part 13, and electric connecting part 15 is used to be connected with the tab.

[0025] In the above-mentioned implementation, by setting the first connecting part 12, the welding part 11 protrudes towards the pole 40, and the first connecting part 12 extends in the direction of deviating from the pole 40, so that when the welding part 11 is welded, the reverse bending of the first connecting part 12 can avoid the deformation of the welding surface 111, the first connecting part 12, the second connecting part 13 and the third connecting part 14 form the groove 121 with the opening facing the pole 40, the groove 121 can buffer the tension of local deformation of welding, ensure the flatness of the electric connecting part 15, and the groove 121 can also buffer the deformation tension of thermal expansion and cold contraction, so that the connection of the electric connecting part is more stable, and the second connecting part 13 can also collect welding slag.

[0026] The thickness of the welding part 11, the first connecting part 12, the second connecting part 13, the third connecting part 14 and the electric connecting part 15 can be the same or different.

[0027] The second connecting part 13 is arranged around the welding part 11, so that the second connecting part 13 can carry the welding slag around the welding part 11, and the welding slag is prevented from falling into the inside of the battery cell.

[0028] The welding part 11 and the first connecting part 12 form a protrusion towards the pole 40, and preferably, the cross section of the protrusion gradually decreases towards the pole 40, so that when the protrusion is welded to the pole 40, the diameter change can guide the positioning.

[0029] The first connecting part 12, the second connecting part 13 and the third connecting part 14 form a groove 121 with an opening towards the pole 40, and preferably, the groove 121 is an open groove 121 with the opening towards the pole 40, so that the groove 121 can also guide the positioning, and at the same time, the electric connecting part 15 is closer to the lower insulating part 30, and the space inside the battery cell is increased.

[0030] The electric connecting sheet 10 described above can be used for the electric connection inside the battery cell, and can also be used for the electric connection between the battery cell and the battery cell outside the battery cell, and the electric connecting sheet 10 can be used for any electric connection.

[0031] Reference Figure 3 The utility model discloses a top cap assembly, including above-mentioned electric connecting sheet 10, still include top cap piece 20, lower insulating part 30, pole 40, upper insulating part 50 and sealing element 60, lower insulating part 30 is connected with the inside surface of top cap piece 20, top cap piece 20 is equipped with first pole 40 mounting hole, lower insulating part 30 is equipped with second pole 40 mounting hole, pole 40 passes through first pole 40 mounting hole and second pole 40 mounting hole, sealing element 60 is set up in pole 40 outside, and is located between pole 40 and top cap piece 20, upper insulating part 50 is set up in pole 40 outside, and upper insulating part 50 sets up in the outside surface of top cap piece 20, and upper insulating part 50 is located between top cap piece 20 and pole 40, and the end of pole 40 close to lower insulating part 30 is welded with the welding surface 111 of electric connecting sheet 10, and first connecting part 12, second connecting part 13, third connecting part 14 and electric connecting part 15 all are located in the inside of lower insulating part 30, namely the side of deviating from top cap piece 20.

[0032] Preferably, in a specific embodiment, the edge of the second pole 40 mounting hole of the lower insulating member 30 comprises a first abutting portion 31 in surface contact with the first connecting portion 12, a second abutting portion 32 in surface contact with the second connecting portion 13, and a third abutting portion 33 in surface contact with the third connecting portion 14, the welding portion 11 and the first connecting portion 12 form a protrusion towards the pole 40, the first abutting portion 31 is used for guiding the protrusion, facilitating the installation guiding and positioning of the welding portion 11, the first connecting portion 12, the second connecting portion 13 and the third connecting portion 14 form a groove 121 with an opening towards the pole 40, the first abutting portion 31, the second abutting portion 32 and the third abutting portion 33 form a protruding portion in snap-fit with the groove 121, not only facilitating the guiding and positioning, but also making the electrical connecting portion 15 abut against the lower insulating member 30, leaving more storage space inside the battery cell.

[0033] Further preferably, at least part of the upper insulating member 50 is located directly above the second connecting portion 13, and the second connecting portion 13 and the upper insulating member 50 form an upper and lower clamping fit, improving the stability and sealing of the pole 40.

[0034] Further preferably, the edge of the first pole 40 mounting hole is provided with a protruding segment 21 protruding towards the lower insulating member 30, the edge of the protruding segment 21 away from the top cover sheet 20 extends towards the center of the first pole 40 mounting hole to form a lower ring 22, and the side wall of the pole 40 is provided with a pressing portion 41 protruding outwardly; at least part of the pressing portion 41 is located directly above the lower ring 22; the first abutting portion 31, the second abutting portion 32 and the third abutting portion 33 form a recess with an opening towards the top cover sheet 20, and the lower ring 22 is accommodated in the recess. The protruding segment 21 and the lower ring 22 form a raised portion raised towards the lower insulating member 30, and the raised portion plays a guiding and positioning role in the assembly of the lower insulating member 30 and the upper insulating member 50.

[0035] Continuing to refer to Figure 3 In the specific embodiment, the sealing member 60 is arranged between the pressing portion 41 and the lower ring 22, and a gap is left between the side wall of the first pole 40 mounting hole and the side wall of the pole 40 for injection molding of the upper insulating member 50 from the upper surface of the top cover sheet 20, and the upper insulating member 50 is connected with the outer surface of the top cover sheet 20, the side wall of the pole 40 and the side wall of the first pole 40 mounting hole. Preferably, the upper insulating member 50 is also connected with the sealing member 60, so that the top cover sheet 20, the pole 40 and the sealing member 60 are fixed as a whole.

[0036] Continuing to refer to Figure 3 Preferably, the first abutting segment of the lower insulating member 30 is located between the pole 40 and the lower ring 22, and also plays a role in insulating the pole 40 and the top cover sheet 20.

[0037] Continuing to refer to Figure 3Because the welding part 11 of the electric connecting sheet 10 of the application is a protrusion in the direction of the pole 40, the end of the pole 40 located inside the electric core can be higher than the lower insulating piece 30 or can be located inside the lower insulating piece 30, and the electric connecting sheet 10 of the application can match more structures of the top cover assembly.

[0038] The utility model discloses still a kind of electric core, including above-mentioned top cover assembly.

[0039] The above-described embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent application scope. It should be pointed out that, for ordinary skilled person in the art, without departing from the concept of the utility model, a number of variations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An electrical connecting tab, characterized by The welding portion is provided with a welding surface parallel to the end surface of the pole; The edge of the welding portion is bent to form a first connecting portion; The edge of the first connecting portion is bent to form a second connecting portion; The edge of the second connecting portion is bent to form a third connecting portion; The third connecting portion is connected with the edge of the second connecting portion. The second connecting portion surrounds the welding portion.

2. The electrical lug of claim 1, wherein, The welding portion and the first connecting portion form a protrusion toward the pole, and the cross section of the protrusion gradually decreases toward the pole.

3. The electrical lug of claim 1, wherein, The first connecting portion, the second connecting portion and the third connecting portion form a groove with an opening toward the pole.

4. The electrical lug of claim 1, wherein, The top cover assembly comprises the electrical connecting sheet.

5. A cap assembly characterized in that, The top cover assembly further comprises a top cover sheet, a lower insulating member, a pole, an upper insulating member and a sealing member.

6. The roof assembly of claim 5, wherein, The edge of the second pole mounting hole of the lower insulating member comprises a first abutting portion in surface contact with the first connecting portion, a second abutting portion in surface contact with the second connecting portion and a third abutting portion in surface contact with the third connecting portion.

7. The roof assembly of claim 6, wherein, Part of the upper insulating member is located directly above the second connecting portion.

8. The roof assembly of claim 6 or 7, wherein, The edge of the first pole mounting hole is provided with a protruding section protruding toward the lower insulating member.

9. The roof assembly of claim 8, wherein, The side wall of the pole is provided with a pressing portion protruding outward. The pressing portion or part of the pressing portion is located directly above the lower ring. The first abutting portion, the second abutting portion and the third abutting portion form a recess with an opening toward the top cover sheet. The lower ring is accommodated in the recess. The top cover assembly comprises the top cover assembly as claimed in any one of claims 5 to 9.

10. An electric cell characterized by ​

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