CN219591462U

CN219591462U - Battery cell

Info

Publication number: CN219591462U
Application number: CN202320720354.8U
Authority: CN
Inventors: 邢依然
Original assignee: Weilai Battery Technology Anhui Co ltd
Current assignee: Weilai Battery Technology Anhui Co ltd
Priority date: 2023-03-31
Filing date: 2023-03-31
Publication date: 2023-08-25
Anticipated expiration: 2033-03-31

Abstract

The utility model relates to a battery, which comprises a first electric core, a second electric core and a pole assembly, wherein the first electric core and the second electric core are arranged along a first direction, the pole assembly is respectively and electrically connected with pole lugs of the first electric core and the second electric core, and the pole assembly is arranged between the first electric core and the second electric core. The utility model can reduce the length of a single battery core, so that the current density of the pole pieces inside the first battery core and the second battery core are uniformly distributed, and the rate capability is improved.

Description

Battery cell

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery.

Background

With the popularization of new energy automobiles, the power battery market is rapidly developed, so that the technical innovation of the power battery is gradually increased, various batteries are derived, and a long-cell battery is one of the batteries.

The long cell battery has been developed rapidly due to the advantages of high safety, high energy density, low cost and the like, but most of the existing long cell battery leads out the tabs at two ends of the cell battery, and the cell battery of the type can lead to uneven current density distribution of the internal pole piece, poor multiplying power performance and further influence the overall electrical performance due to the fact that the cell battery is long.

Disclosure of Invention

The utility model aims to provide a battery, so that the current density of a pole piece in the battery is uniformly distributed, and the rate capability is improved.

The aim of the utility model is achieved by adopting the following technical scheme. According to the battery provided by the utility model, the battery comprises a first electric core, a second electric core and a pole assembly, wherein the first electric core and the second electric core are arranged along a first direction, and the pole assembly is electrically connected with the pole lugs of the first electric core and the second electric core respectively.

In some embodiments of the present utility model, in some embodiments,

the electrode post assembly comprises an anode post, and the anode post is respectively and electrically connected with anode lugs of the first electric core and the second electric core; and/or, the pole assembly comprises a negative pole, and the negative pole is respectively and electrically connected with the negative lugs of the first electric core and the second electric core.

In some embodiments of the present utility model, in some embodiments,

the positive pole assembly further comprises a positive pole switching piece, one end of the positive pole switching piece is electrically connected with the positive pole lug, and the other end of the positive pole switching piece is electrically connected with the positive pole; and/or, the pole assembly further comprises a negative electrode switching piece, one end of the negative electrode switching piece is electrically connected with the negative electrode lug, and the other end of the negative electrode switching piece is electrically connected with the negative pole.

In some embodiments, the electrode assembly further comprises an outer frame, the positive electrode and/or the negative electrode being disposed at an end of the outer frame in a second direction.

In some embodiments, the positive electrode tab and/or the negative electrode tab are secured within the outer frame.

In some embodiments, the positive electrode tab and/or the negative electrode tab are/is provided with a welding area welded with the positive electrode tab and/or the negative electrode tab and extending along the first direction, and the outer surface of the outer frame is provided with a first opening facing the welding area.

In some embodiments, the battery further comprises a first shell covering the first electric core and a second shell covering the second electric core, and the first shell and the second shell are respectively fixed with the outer frame in a sealing manner through welding.

In some embodiments, the ends of the first shell and the second shell facing the outer frame are respectively provided with a second opening and a third opening, and a part of the outer frame is accommodated in the second opening and the third opening.

In some embodiments, the battery further comprises a first bracket between the first cell and the outer frame and a second bracket between the second cell and the outer frame, the second bracket being partially received within the outer frame and snap-fit fixedly connected with the first bracket; and/or the part of the second bracket contained in the outer frame is provided with a second through hole for the positive pole and/or the negative pole to pass through; and/or a separator is arranged in the second bracket, and the positive electrode transfer sheet and the negative electrode transfer sheet are positioned at two sides of the separator; and/or, the battery further comprises a first insulating film coating the first battery core and a second insulating film coating the second battery core, wherein the first bracket is at least partially accommodated in the first insulating film and fixedly connected with the first insulating film, and the second bracket is at least partially accommodated in the second insulating film and fixedly connected with the second insulating film.

In some embodiments, the pole assembly further comprises a shielding sheet covering the first opening, and the shielding sheet is welded, sealed and fixed with the outer frame.

The beneficial effects of the utility model at least comprise:

1. according to the utility model, the traditional long battery cells are split into the first battery cells and the second battery cells which are arranged in the first direction, and the pole column assemblies which are respectively and electrically connected with the first battery cells and the second battery cells are arranged between the first battery cells and the second battery cells, so that the length of a single battery cell can be reduced, the current density distribution of the pole pieces inside the first battery cells and the second battery cells is uniform, and the rate capability is improved;

2. according to the utility model, through the outer frame structural design of the pole assembly, the first shell for cladding the first battery core and the second shell for cladding the second battery core can be connected in a sealing manner, the length of a welding seam between the first shell and the outer frame and between the second shell and the outer frame is reduced, the welding efficiency is improved, and the positive pole and the negative pole can be arranged, so that the purpose of leading out current is realized, and the space can be saved;

3. according to the utility model, through the design that the welding area extends along the first direction, the positive electrode lug and the negative electrode lug of the first battery cell and the second battery cell extend along the first direction and are parallel to the welding area, so that the bending of the electrode lug is not required, the production process is simplified, and the risk of short circuit between the electrode lug and the pole piece is reduced.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model, as well as the preferred embodiments thereof, together with the following detailed description of the utility model given in conjunction with the accompanying drawings.

Drawings

Fig. 1 is a schematic view of an assembled structure of a battery according to an embodiment of the present utility model;

fig. 2 is an exploded view of a battery according to an embodiment of the present utility model;

fig. 3 is another exploded view of a battery according to an embodiment of the present utility model;

FIG. 4 is a schematic view showing an assembly structure of a pole assembly according to an embodiment of the present utility model

FIG. 5 is an exploded view of a pole assembly according to one embodiment of the present utility model;

FIG. 6 is a top view of a pole assembly according to one embodiment of the present utility model;

FIG. 7 is a cross-sectional view of the pole assembly of FIG. 6 taken along the direction A-A in accordance with one embodiment of the present utility model;

FIG. 8 is a schematic view of the structure of a first housing according to an embodiment of the present utility model;

fig. 9 is a schematic structural view of a second housing according to an embodiment of the present utility model.

Detailed Description

In order to further describe the technical means of the present utility model, the following detailed description of a specific embodiment of a battery according to the present utility model is given with reference to the accompanying drawings and preferred embodiments. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.

In the description of embodiments of the present utility model, the technical terms "first" and "second" and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

As shown in fig. 1, 2 and 3, the battery according to the present utility model includes a first cell 1, a second cell 2 and a post assembly 3, and in one or more embodiments, the first cell 1 and the second cell 2 may each be configured in a rectangular parallelepiped shape. The first battery cell 1 and the second battery cell 2 are arranged along a first direction, the pole assembly 3 is electrically connected with pole lugs of the first battery cell 1 and the second battery cell 2 respectively, and the pole assembly 3 is arranged between the first battery cell 1 and the second battery cell 2. According to the utility model, the traditional long battery cells are split into the first battery cell 1 and the second battery cell 2 which are arranged in the first direction, and the pole column assemblies 3 which are respectively and electrically connected with the first battery cell 1 and the second battery cell 2 are arranged between the first battery cell 1 and the second battery cell 2, so that the length of a single battery cell can be reduced, the current density distribution of the pole pieces inside the first battery cell 1 and the second battery cell 2 is uniform, and the multiplying power performance is improved.

The first direction is preferably a length direction, and in other embodiments, the first direction may be a width direction, a height direction, or the like, which is not particularly limited herein.

In the following embodiments, the length direction of the first battery cell 1 is taken as a first direction x, the width direction of the first battery cell 1 is taken as a second direction y, and the positive electrode tab and the negative electrode tab of the first battery cell 1 are positioned at one end of the positive electrode column assembly 3 of the first battery cell 1; and/or the positive electrode lug and the negative electrode lug of the second battery cell 2 are positioned at one end of the positive electrode column assembly 3 of the second battery cell 2. For example, two tabs of the first battery cell 1 are all disposed at one end of the first battery cell 1 in the first direction, two tabs of the second battery cell 2 are all disposed at one end of the second battery cell 2 in the first direction, and two tabs of the first battery cell 1 are connected with two tabs of the second battery cell 2 through the pole assembly 3.

As shown in fig. 4 to 7, in one or more embodiments, the post assembly 3 includes a positive post 36, and the positive post 36 is electrically connected to positive tabs of the first and second electrical cores 1 and 2, respectively. In one or more embodiments, the pole assembly 3 further includes a negative pole 311, and the negative pole 311 is electrically connected to the negative ears of the first and second electrical cores 1 and 2, respectively. As shown in fig. 4 and 5, in one or more embodiments, the pole assembly 3 further includes a positive electrode tab 34, one end of the positive electrode tab 34 is electrically connected to the positive electrode tab, and the other end of the positive electrode tab 34 is electrically connected to the positive electrode pole 36. In one or more embodiments, the post assembly 3 further includes a negative electrode tab 35, one end of the negative electrode tab 35 being electrically connected to the negative electrode tab, and the other end of the negative electrode tab 35 being electrically connected to the negative electrode post.

As shown in fig. 2 and fig. 4 to fig. 7, the pole assembly 3 further includes a first bracket 31, a second bracket 32 and an outer frame 33, the first bracket 31 is disposed between the first cell 1 and the outer frame 33, the second bracket 32 is disposed between the second cell 2 and the outer frame 33, and a part of the second bracket 32 is accommodated in the outer frame 33 and fixedly connected with the first bracket 31 through a buckle, and the positive pole 36 and/or the negative pole 311 are disposed at an end of the outer frame 33 in the width direction. In one or more embodiments, positive electrode tab 34 and/or negative electrode tab 35 are secured within frame 33. The outer frame 33 is made of a metal material, is used for improving supporting strength, is convenient to be welded, sealed and fixed with the first shell 4 and the second shell 5, and the first bracket 31 and the second bracket 32 are made of insulating materials for insulating the positive pole column 36, the negative pole column 311 and the tab from the outer frame 33. The outer frame 33 includes a bottom plate 331 and a frame 332, the bottom plate 331 is configured in a rectangular parallelepiped shape, and the bottom plate 331 is integrally formed with the frame 332. The width direction of the bottom plate 331 is a first direction, the length direction of the bottom plate 331 is a second direction, the frame 332 has a first end portion 3321 and a second end portion 3322 in the second direction, the first end portion 3321 and the second end portion 3322 of the frame 332 are respectively provided with a first through hole 3323, and in one or more embodiments, the first through hole 3323 is circular. The frame 332 has a first opening 333 formed at the top thereof, and in one or more embodiments, the first opening 333 is configured as a rectangle, and the positive electrode tab 34 and/or the negative electrode tab 35 are provided with a welding area a welded to the positive electrode tab and/or the negative electrode tab and extending in the first direction, the welding area a facing the first opening 333, and welding of the tab is achieved through the first opening 333. According to the utility model, the positive electrode tab 34 and/or the negative electrode tab 35 are provided with the welding area A welded with the positive electrode tab and/or the negative electrode tab and extending along the first direction, and the outer surface of the outer frame 33 is provided with the first opening 333 opposite to the welding area A, so that the positive electrode tab and the negative electrode tab of the first battery cell 1 and the second battery cell 2 extend along the first direction and are parallel to the welding area A, bending of the tab is not needed, the tab is convenient to weld, the production procedure is simplified, and the risk of short circuit between the tab and the pole piece is reduced.

The second bracket 32 is provided with a second through hole for passing through the positive pole and/or the negative pole at the part accommodated in the outer frame 33. For example, the second bracket 32 has a first end 321 and a second end 322 in the second direction, the first end 321 and the second end 322 are respectively provided with a second through hole, the second bracket 32 further has a partition 323 and a bottom plate 324, the partition 323 is disposed in the middle of the second bracket 32 and is used for separating the tabs of the first battery cell 1 and the second battery cell 2, the positive electrode rotating tab 34 and the negative electrode rotating tab 35 are located on two sides of the partition 323, the partition 323 is perpendicular to the bottom plate 324, and the overall shape of the second bracket 32 forms an accommodating space for accommodating the two tabs of the first battery cell 1 and the second battery cell 2. The bottom plate 324 of the second bracket 32 is disposed above the bottom plate 331 of the outer frame 33, and is attached to the bottom plate 331 of the outer frame 33.

In one or more embodiments, the positive electrode tab 34 and the negative electrode tab 35 are each configured in an L-shape, the positive electrode tab 34 and the negative electrode tab 35 are disposed in the receiving space of the second bracket 32, the lower surfaces of the bottoms of the positive electrode tab 34 and the negative electrode tab 35 are attached to the bottom plate 324 of the second bracket 32, and the welding area a is disposed on the upper surfaces of the bottoms of the positive electrode tab 34 and the negative electrode tab 35 for welding the positive electrode tab and the negative electrode tab.

The pole assembly 3 further comprises a riveting block 39, plastic 37 and a sealing ring 38 respectively arranged on the positive pole 36 and the negative pole 311, wherein the sealing ring 38 is sleeved on the positive pole 36 and the negative pole 311 and used for preventing electrolyte leakage. The rivet block 39 and the plastic 37 are respectively provided with a third through hole and a fourth through hole, and the columnar structure of the positive pole 36 sequentially passes through the second through hole, the first through hole 3323, the fourth through hole and the third through hole. Similarly, the columnar structure of the negative electrode post 311 sequentially passes through the second through hole, the first through hole 3323, the fourth through hole, and the third through hole.

As shown in fig. 1, 2, 3 and 4, the battery according to the present utility model further includes a first insulating film 6 for covering the first battery cell 1 and a second insulating film 61 for covering the second battery cell 2, at least a portion of the first support 31 is accommodated in the first insulating film 6 and is fixedly connected with the first insulating film, at least a portion of the second support 32 is accommodated in the second insulating film 61 and is fixedly connected with the second insulating film, the first insulating film 6 and the second insulating film 61 may be made of an insulating material such as a polyester film, and specifically, the first insulating film 6 and the second insulating film 61 may be respectively fixed on the first support 31 and the second support 32 of the pole assembly 3 by a thermal melting manner.

The battery of the present utility model further includes a first housing 4 for covering the first battery cell 1 and a second housing 5 for covering the second battery cell 2, wherein the first housing 5 and the second housing 4 are respectively fixed with the outer frame 33 by welding and sealing, the end parts of the first housing 4 and the second housing 5, which are opposite to the outer frame 33, are respectively provided with a second opening and a third opening, and a part of the outer frame 33 is accommodated in the second opening and the third opening. According to the utility model, the end parts of the first shell 4 and the second shell 5, which are opposite to the outer frame 33, are respectively provided with the second opening and the third opening, and part of the outer frame 33 is accommodated in the second opening and the third opening, so that the first shell 4 coating the first battery cell 1 and the second shell 5 coating the second battery cell 2 can be connected in a sealing manner, the length of a welding seam between the first shell 4 and the second shell 5 and the outer frame 33 is reduced, the welding efficiency is improved, the purpose of leading out current can be realized by arranging the positive pole 36 and the negative pole 311 at the end part of the outer frame 33, and the space can be saved.

As shown in fig. 8 and 9, the end of the first housing 4 facing away from the outer frame 33 in the first direction is provided with a liquid injection hole 41, and the end of the second housing 5 facing away from the outer frame 33 in the first direction is provided with an explosion-proof valve 51. For example, after the first insulating film 6 and the second insulating film 61 are fixed to the first bracket 31 and the second bracket 32, respectively, the first battery cell 1 and the second battery cell 2 may be respectively inserted into the first case 4 and the second case 5, and then sealed at the openings of the first case 4 and the second case 5 by welding, and the length of the welding seam is the perimeter of the opening, so that the welding seam can be reduced.

In some embodiments, the first casing 4 and the second casing 5 are casings with openings at two ends formed by adopting a bending process, so that the battery cell can be conveniently put into the casing, and the assembly efficiency and the yield are improved.

As shown in fig. 3, the battery according to the present utility model further includes a bottom plate 7, where the bottom plate 7 is disposed in the first housing 4 and/or the second housing 5, and the bottom plate 7 is located between the first electric cell 1 and the inner wall of the first housing 4, and/or the bottom plate 7 is located between the second electric cell 2 and the inner wall of the second housing 5, so as to support and insulate the first electric cell 1 and/or the second electric cell 2.

The battery of the present utility model further includes a shielding sheet 8, wherein the shielding sheet 8 covers the first opening 333, and the shielding sheet 8 and the outer frame 33 are sealed and fixed by welding. The lower surface of the shielding sheet 8 is provided with an insulating coating and insulating plastic, and the shielding sheet 8 is fixed on the top of the outer frame 33 by welding. For example, after the first and second battery cells 1 and 2 are packaged by soldering, the shielding sheet 8 may be soldered to the first opening 333 provided at the top of the frame 332 of the outer frame 33, and the first opening 333 is covered and sealed.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to practice the present utility model. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the utility model. Thus, the present utility model is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The battery comprises a first electric core, a second electric core and a pole column component, wherein the first electric core and the second electric core are arranged along a first direction, and the pole column component is respectively and electrically connected with pole lugs of the first electric core and the second electric core.

2. The battery of claim 1, wherein the post assembly comprises a positive post electrically connected to positive tabs of the first and second cells, respectively;

and/or, the pole assembly comprises a negative pole, and the negative pole is respectively and electrically connected with the negative lugs of the first electric core and the second electric core.

3. The battery of claim 2, wherein the post assembly further comprises a positive electrode tab, one end of the positive electrode tab being electrically connected to the positive electrode tab, the other end of the positive electrode tab being electrically connected to the positive electrode post;

and/or, the pole assembly further comprises a negative electrode switching piece, one end of the negative electrode switching piece is electrically connected with the negative electrode lug, and the other end of the negative electrode switching piece is electrically connected with the negative pole.

4. The battery of claim 3, wherein the post assembly further comprises an outer frame, the positive and/or negative posts being disposed at an end of the outer frame in a second direction.

5. The battery of claim 4, wherein the positive electrode tab and/or the negative electrode tab are secured within the outer frame.

6. The battery according to claim 4, wherein the positive electrode tab and/or the negative electrode tab is provided with a welding area welded to the positive electrode tab and/or the negative electrode tab and extending in the first direction, and the outer surface of the outer frame is provided with a first opening facing the welding area.

7. The battery of claim 4, further comprising a first housing surrounding the first cell and a second housing surrounding the second cell, wherein the first housing and the second housing are respectively secured to the outer frame by welding and sealing.

8. The battery of claim 7, wherein the ends of the first and second housings facing the outer frame are respectively provided with a second opening and a third opening, and a part of the outer frame is accommodated in the second and third openings.

9. The battery of claim 7, further comprising a first bracket between the first cell and the outer frame and a second bracket between the second cell and the outer frame, the second bracket being partially received within the outer frame and snap-fit fixedly connected to the first bracket; and/or the part of the second bracket contained in the outer frame is provided with a second through hole for the positive pole and/or the negative pole to pass through; and/or a separator is arranged in the second bracket, and the positive electrode transfer sheet and the negative electrode transfer sheet are positioned at two sides of the separator; and/or, the battery further comprises a first insulating film coating the first battery core and a second insulating film coating the second battery core, wherein the first bracket is at least partially accommodated in the first insulating film and fixedly connected with the first insulating film, and the second bracket is at least partially accommodated in the second insulating film and fixedly connected with the second insulating film.

10. The battery of claim 6, wherein the post assembly further comprises a shielding sheet covering the first opening, the shielding sheet being welded, sealed and secured to the outer frame.