CN216750012U

CN216750012U - Secondary battery and power utilization device

Info

Publication number: CN216750012U
Application number: CN202122350653.0U
Authority: CN
Inventors: 武冬冬; 李恺
Original assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-06-14
Anticipated expiration: 2031-09-27

Abstract

The utility model provides a secondary battery and an electric device, comprising a shell, an electrode assembly, a current collecting component and a top cover assembly; the electrode assembly is accommodated in the shell and comprises a main body part and a tab, and the tab extends from the main body part along the transverse direction; the current collecting component comprises a substrate and a connecting sheet, wherein the connecting sheet is arranged on one surface of the substrate, which is far away from the main body part, and extends along the transverse direction; the base plate is provided with a through hole along the transverse direction, and the connecting sheet is welded with the lug after the lug passes through the through hole and is folded back along the longitudinal direction; the top cover assembly comprises a top cover plate and an electrode terminal arranged on the top cover plate, the top cover plate is connected to the shell, and the electrode terminal is connected with one end of the substrate. Compared with the prior art, the secondary battery provided by the utility model not only improves the transverse space utilization rate, but also is simple to process, can avoid the reverse insertion of the tab, and is higher in reliability.

Description

Secondary battery and power utilization device

Technical Field

The utility model relates to the field of secondary batteries, in particular to a secondary battery and an electric device.

Background

The secondary battery generally includes an electrode assembly, a case, electrode terminals, and a current collecting member for electrically connecting the electrode assembly and the electrode terminals. In the molding process of the secondary battery, it is general to weld the tabs of the electrode assembly to the current collecting member and then bend the current collecting member and the tabs to reduce the space occupied by the current collecting member and the tabs. However, the technical scheme has the problems that bending is difficult to realize, and the pole piece is possibly damaged by bending, so that the reliability is low, and the method is not suitable for the current industrial production.

In view of the above, it is necessary to provide a technical solution to the above problems.

SUMMERY OF THE UTILITY MODEL

One of the objects of the present invention is: aiming at the defects in the prior art, the secondary battery is provided, the transverse space utilization rate of the battery is improved, the processing is simple, and the reliability is higher.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a secondary battery comprising:

a housing;

an electrode assembly housed in the case, the electrode assembly including a main body portion and a tab extending from the main body portion in a transverse direction;

the current collecting component comprises a substrate and a connecting sheet, and the connecting sheet is arranged on one surface of the substrate, which is far away from the main body part, and extends along the transverse direction; the substrate is provided with a through hole along the transverse direction, and the connecting sheet is welded with the lug after the lug passes through the through hole and is folded back along the longitudinal direction;

the top cover assembly comprises a top cover plate and an electrode terminal arranged on the top cover plate, the top cover plate is connected with the shell, and the electrode terminal is connected with one end of the substrate.

Preferably, the connecting sheet is integrally formed with the substrate or welded to the substrate.

Preferably, the connecting tab extends at an edge adjacent the through opening.

Preferably, the connection piece has a cross-sectional view including any one of "|", "+", "-t", "+", "" [ "," "," "□".

Preferably, after the connecting sheet is welded with the tab and folded back, the tab is clamped between the connecting sheet and the substrate, and/or the connecting sheet is clamped between the tab and the substrate.

Preferably, the through opening is n-shaped or oval, and n is more than or equal to 3.

Preferably, the length of the through opening is 1-100 mm.

Preferably, the opening is provided with a plurality of, the connection piece is provided with a plurality of, and with the opening one-to-one sets up.

Preferably, the opening is provided with one, the connection piece is provided with a plurality of, distribute in respectively the edge of opening.

Another object of the present invention is to provide an electric device including the secondary battery according to any one of the above aspects.

Compared with the prior art, the utility model has the beneficial effects that: according to the secondary battery provided by the utility model, the through hole for the pole lug to pass through is formed in the substrate of the current collecting component, the connecting sheet is arranged on the surface, away from the main body part of the electrode assembly, of the substrate, the pole lug can be welded with the connecting sheet after passing through the through hole, and then the pole lug and the connecting sheet are folded back on the substrate, so that the transverse space utilization rate of the secondary battery can be greatly improved.

Drawings

Fig. 1 is a front view of a secondary battery according to the present invention.

Fig. 2 is one of top views of the secondary battery according to the present invention.

Fig. 3 is a second plan view of the secondary battery of the present invention.

Fig. 4 is a plan view of a tab and a tab of a secondary battery according to the present invention when they are not folded back.

Fig. 5 is a schematic view showing a connection sheet of a secondary battery of the present invention folded back.

Fig. 6 is a schematic structural view of a current collecting member according to the present invention.

Fig. 7 is a side view of fig. 6.

Fig. 8 is a second schematic structural view of the current collecting member of the present invention.

Fig. 9 is a side view of fig. 8.

In the figure: 1-an electrode assembly; 11-a body portion; 12-a tab; 2-a current collecting member; 21-a substrate; 22-connecting pieces; 23-a through opening; 3-a top cover assembly; 31-a top cover plate; 32-electrode terminals; 4-shell.

Detailed Description

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model provides an electric device which can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers.

The electric device includes a secondary battery, which may be a lithium ion battery or a sodium ion battery.

As shown in fig. 1 to 3, the secondary battery includes a case 4, an electrode assembly 1, a current collecting member, and a cap assembly 3.

Wherein, the electrode assembly 1 is accommodated in the casing 4, and comprises a main body part 11 and a tab 12, and the tab 12 extends from one end of the main body part 11 along the transverse direction; the main body 11 includes at least one naked electric core, can be 2, 4, 6 etc., and this utmost point ear also can be 2, 3, 4, 5, 6 etc. a plurality of. The tab can be led out from one end of the main body part; or respectively led out from two ends of the main body part, wherein a positive pole tab is led out from one end of the main body part, and a negative pole tab is led out from the other end of the main body part. The above-mentioned lateral direction is the X direction.

The bare cell comprises a positive pole piece, a negative pole piece and a diaphragm which is arranged between the positive pole piece and the negative pole piece at intervals, and can be manufactured by winding or laminating. The positive pole piece is led out of the positive pole piece and is made of aluminum foil; and the negative pole tab led out from the negative pole piece can be made of copper foil or nickel-to-copper.

The top cap assembly 3 includes a top cap plate 31 and an electrode terminal 32 provided to the top cap plate 31, and the top cap plate 31 is coupled to the case 4 and covers the opening of the case 4, thereby enclosing the electrode assembly 1 within the case 4. The electrode terminals 32 are provided in at least two, one of which is for electrical connection with the positive electrode tab 12 and the other of which is for electrical connection with the negative electrode tab 12.

The current collecting member 2 comprises a substrate 21 and a connecting sheet 22, wherein the connecting sheet 22 is arranged on one surface of the substrate 21 far away from the main body part 11 and extends along the transverse direction; the base plate 21 is provided with a through hole 23 along the transverse direction, and the connecting sheet 22 is welded with the tab 12 after the tab 12 passes through the through hole 23 and is folded back along the longitudinal direction. The longitudinal direction is the Y direction, i.e. the direction is folded back along the direction close to the main body part 11, so as to greatly improve the transverse utilization rate of the battery. A schematic view before the connecting sheet 22 and the tab 12 are folded back is shown in fig. 4, and a schematic view of a direction in which the connecting sheet 22 is folded back can be shown in fig. 5.

The utility model adopts the current collecting component 2, the connecting sheet 22 is extended on the substrate 21, the connecting sheet 22 is thinner, the bending of the connecting sheet 22 and the tab 12 is easier, and the problem of large bending difficulty caused by the thicker substrate 21 and the like after the substrate 21 and the tab 12 are welded is greatly reduced.

In some embodiments, when the tabs 12 are respectively drawn out from both ends of the body part 11, both ends are provided with the current collecting members 2, respectively. In some embodiments, when the tabs 12 are all led out from one end of the body portion 11, only the end is provided with the current collecting member 2, and the current collecting members 2 corresponding to the tabs 12 of different polarities are disposed at intervals or in an insulated state.

In some embodiments, the connecting piece 22 is integrally formed with the base plate 21, that is, the connecting piece 22 is directly and integrally extended from the base plate 21, the connecting piece 22 is extended at an edge near the through hole 23 so as to be welded with the tab 12 protruding from the through hole 23, the welding between the connecting piece and the tab can be any one of ultrasonic welding, laser welding or resistance welding, and the welding area can be full welding or partial welding. The inflection line after the connection piece 22 and the tab 12 are welded may be based on the connection point of the connection piece 22 and the base plate 21 near the through hole 23, or may be based on the edge of the welding surface of the connection piece 22 and the tab 12. More specifically, the connecting piece 22 is in the shape of an "|" in a cross-sectional view, and the connecting piece 22 is considered to be a thin sheet-like rectangle extending in the transverse direction X directly at the edge of the through opening 23.

In some embodiments, the connection pad 22 is welded to the substrate 21, and the connection pad 22 has a cross-sectional view including, but not limited to, any one of "|", "+", "-t", "+", "" ] ". Wherein, the montant is the main shaft that connecting piece 22 extends along horizontal X direction, and the montant extends and forms connecting piece 22 can be lamellar rectangle, and this montant is being close to the edge of opening 23 extends to with the utmost point ear 12 welding of wearing out from opening 23, welding between them can be any one of ultrasonic bonding, laser welding or resistance weld, and welding area can be for full weld or partial welding. While the remaining portions of the cross bar, which may be on the base 21 remote from the through opening 23 or on the base 21 near the through opening 23, are directly soldered to the base 21 to better connect the connecting piece 22 to the base 21. In other embodiments, the cross-sectional view of the connecting piece 22 may also be "□", with one of the vertical bars being the major axis of the connecting piece 22 extending in the transverse direction X, and the other vertical bar and the remaining cross bars being also welded directly to the base plate 21. It should be noted that, in the cross-sectional view of the connecting piece 22, the lengths of the cross bar and the vertical bar are not limited, but mainly the shape thereof is limited.

Preferably, the extension of the connecting piece 22 in the transverse direction X is greater than or equal to the length of the through opening 23 in the longitudinal direction Y.

Preferably, after the connecting piece 22 is welded to the tab 12 and folded back, the tab 12 is clamped between the connecting piece 22 and the substrate 21, and/or the connecting piece 22 is clamped between the tab 12 and the substrate 21. When the tab structure comprises a plurality of connecting pieces 22 and a plurality of tabs 12, after the connecting pieces and the tabs 12 are welded and folded back, a part of the tabs 12 can be clamped between the connecting pieces 22 and the substrate 21; the other part of the tab 12 is disposed on the surface of the connecting piece 22 away from the substrate 21, that is, the connecting piece 22 is sandwiched between the tab 12 and the substrate 21.

More preferably, after the connecting piece 22 and the tab 12 are welded and folded back, the tab 12 is sandwiched between the connecting piece 22 and the substrate 21, that is, the tab 12 is folded back in a direction close to the main body 11 based on the tab 12, so that the welding between the connecting piece 22 and the substrate 21 can be shielded, thereby protecting the welding burr and providing the safety performance of the battery. It is further preferable that the length of the joint between the tab 12 and the connecting piece 22 in the transverse direction X is greater than the length of the through opening 23 in the longitudinal direction, so that the tab 12 and the connecting piece 22 can cover part of the through opening 23 after being folded back, thereby improving the appearance and the overall strength of the battery.

In some embodiments, the through openings 23 are n-sided polygons or ellipses, where n ≧ 3. Specifically, the through opening 23 may be a triangle, a quadrangle, a pentagon, a hexagon, an octagon, etc., and the through opening 23 is configured to allow the tab 12 to pass therethrough. Preferably, the through opening 23 is rectangular, and can be better adapted to the tab 12, the long side is greater than or equal to the width of the tab 12, the short side is greater than the thickness of the tab 12 and less than the width of the substrate 21, and more preferably, the length of the short side is 1.5 times of the thickness of the tab 12.

In some embodiments, as shown in fig. 6 to 7, the through holes 23 are provided in a plurality, and the connecting pieces 22 are provided in a plurality and are arranged in one-to-one correspondence with the through holes 23. Specifically, this opening 23 can be 2 ~ 20, and the dislocation distributes on base plate 21, and is corresponding, and connection piece 22 also is provided with 2 ~ 20, extends in the edge that is close to opening 23, and every opening 23 all has utmost point ear 12 to pass and the welding of connection piece 22. More specifically, the length of the through opening 23 is 1 to 100mm, and the through opening can be specifically set according to the width of the tab 12.

In some embodiments, as shown in fig. 8 to 9, one through opening 23 is provided, and a plurality of connecting pieces 22 are provided and respectively distributed at the edge of the through opening 23. That is, it can be said that a plurality of through-holes 23 communicate and form a through-hole 23, and connection piece 22 specifically can be provided with 2 ~ 20, extends in the edge that is close to through-hole 23, and utmost point ear 12 all passes this through-hole 23 back and welds with connection piece 22. The length of this through-opening 23 should take a longer length to satisfy a plurality of non-overlapping passing through-openings 23 of utmost point ear 12. More specifically, the length of the through opening 23 is 10 to 100 mm.

In some embodiments, the base plate 21 of the current collecting member 2 has a "shape" in which the cross bar is connected to the electrode terminal 32, and the connecting pieces 22 are disposed on the vertical bars and connected to the tabs 12. In some embodiments, the base plate 21 of the current collecting member 2 has a "|" shape, one end of which is bent to form a "|", and the beam portion is also connected to the electrode terminal 32.

Taking the main body part 11 as an example of two-side tab 12 of 2 bare cells, the preparation process of the secondary battery is as follows: the tabs 12 with the same polarity are arranged on the same side, two battery cells are placed on the same side, the two substrates 21 are respectively placed on the two sides, and the through holes 23 are arranged corresponding to the positions of the tabs 12, so that the tabs 12 can easily penetrate through the through holes 23; the tab 12 penetrates through the through hole 23 and then is welded with the connecting sheet 22, and then is folded back along one side of the through hole 23 without the connecting sheet 22, so that the tab 12 is clamped between the connecting sheet 22 and the substrate 21 to play a role in preventing welding burrs; next, the battery cell is placed in the case 4, one end of the base plate 21 is connected to the electrode terminal 32, and the top cap plate 31 is connected to the case 4 and covers the opening of the case 4, thereby enclosing the electrode assembly 1 within the case 4, completing the preparation of the secondary battery.

Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A secondary battery, characterized by comprising:

a housing;

2. The secondary battery according to claim 1, wherein the connection tab is integrally formed with the substrate or welded to the substrate.

3. The secondary battery of claim 2, wherein the connecting tab extends at an edge proximate the through opening.

4. The secondary battery according to claim 2, wherein a cross-sectional view of the connection tab includes any one of "|", "+", "[", "]," and □ ".

5. The secondary battery according to any one of claims 1 to 4, wherein after the connecting sheet and the tab are welded and folded back, the tab is sandwiched between the connecting sheet and the substrate, and/or the connecting sheet is sandwiched between the tab and the substrate.

6. The secondary battery according to claim 1, wherein the through-hole is n-sided or elliptical, and n.gtoreq.3.

7. The secondary battery according to claim 1 or 6, wherein the length of the through port is 1 to 100 mm.

8. The secondary battery according to claim 7, wherein the through openings are provided in plural numbers, and the connecting pieces are provided in plural numbers in one-to-one correspondence with the through openings.

9. The secondary battery according to claim 7, wherein the through hole is provided in one, and the connecting pieces are provided in a plurality of numbers, respectively distributed at edges of the through hole.

10. An electric device comprising the secondary battery according to any one of claims 1 to 9.