CN214848952U

CN214848952U - Battery core, battery core assembly, battery and device using battery

Info

Publication number: CN214848952U
Application number: CN202120634133.XU
Authority: CN
Inventors: 唐阳; 周龙
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-11-23
Anticipated expiration: 2031-03-29

Abstract

The application provides a device of electricity core, electric core subassembly, battery and use battery relates to lithium cell technical field. A battery cell comprises a first polarity pole piece, a second polarity pole piece and a diaphragm. The utmost point ear of first polarity pole piece is including the first utmost point ear section that connects gradually, first bending section, second utmost point ear section, second bending section and third utmost point ear section, the one end and this body coupling of first utmost point ear section, first bending section extends to the direction of keeping away from the body for first utmost point ear section, second utmost point ear section extends along the direction that is on a parallel with the thickness of electric core, the second bending section extends to the direction of keeping away from the body for second utmost point ear section, third utmost point ear section extends along the direction that is on a parallel with the thickness of electric core. This electric core is through buckling twice to utmost point ear, reduces utmost point ear because of the redundancy of buckling the production, avoids utmost point ear to insert in the electric core, reduces the probability that electric core broke down.

Description

Battery core, battery core assembly, battery and device using battery

Technical Field

The application relates to the technical field of lithium batteries, in particular to an electric core, an electric core assembly, a battery and a device using the battery.

Background

The lithium ion battery is an advanced chemical energy storage device and has the remarkable advantages of high specific energy, long cycle life, environmental friendliness and the like. The lithium ion battery is provided with a battery core, the battery core comprises a lug, the lug generally has a certain length, and in the assembling process, the lug is connected with the adapter after being bent. The utmost point ear is buckled and can be caused its tip dislocation, and the utmost point ear in the kink outside is big for the utmost point ear dislocation degree of the most inboard, and the thickness of utmost point ear is big more, and this dislocation degree is big more. If the lugs are arranged to be shorter, the lugs on the outermost side can not be connected with the adaptor; if the tab is arranged longer, although the tab can be connected with the adapter, the redundancy of the innermost tab formed by bending is too large, which easily causes the tab to be electrically connected with other components in the battery, causes the internal short circuit of the battery, and causes the damage of the battery.

SUMMERY OF THE UTILITY MODEL

The application aims to provide an electric core, an electric core assembly, a battery and a device using the battery, so that the technical problem that the redundancy of an inner electrode lug of the battery is high and the internal short circuit of the battery is easily caused is solved.

In a first aspect, an embodiment of the present application provides an electrical core, which includes a first polarity pole piece, a second polarity pole piece, and a diaphragm disposed between the first polarity pole piece and the second polarity pole piece. First polarity pole piece includes the body and the conductive part that extends from the body, a plurality of conductive part stromatolites set up and form utmost point ear, utmost point ear is including the first utmost point ear section that connects gradually, first bending segment, second utmost point ear section, second bending segment and third utmost point ear section, the one end and this body coupling of first utmost point ear section, the other end is connected with first bending segment, first bending segment extends to the direction of keeping away from the body for first utmost point ear section, the one end and the first bending segment of second utmost point ear section are connected, the other end extends along the direction that is on a parallel with the thickness of electricity core, the second bending segment extends to the direction of keeping away from the body for second utmost point ear section, the one end and the second bending segment of third utmost point ear section are connected, the other end extends along the direction that is on a parallel with the thickness of electricity core.

The application provides an electric core is through carrying out twice bending type to utmost point ear and forming S type structure, and the utmost point ear of utmost point ear produced when buckling for the first time is long, eliminates to a certain extent when buckling for the second time, reduces utmost point ear because of the redundancy of buckling the production, avoids utmost point ear to insert electric core, reduces the probability that electric core broke down.

In one possible implementation, the bending radians of the first bending section and the second bending section are the same.

This structure makes first utmost point ear section, second utmost point ear section and the mutual parallel arrangement of third utmost point ear section, and first utmost point ear is buckled the most inboard utmost point ear's that produces at the first time verbose simultaneously and is long, and great degree is eliminated when buckling for the second time for first utmost point ear section, second utmost point ear section and third utmost point ear section are comparatively level and smooth.

In a possible implementation manner, the first tab section extends from the body to a direction away from the center of the battery cell, the second tab section extends to a direction close to the center of the battery cell, and the third tab section extends to a direction away from the center of the battery cell.

This structure makes first utmost point ear set up in the side of electric core, when helping closing the core, the connection between the utmost point ear of two electric cores.

In one possible implementation, the lengths of the first tab segment, the second tab segment, and the third tab segment are all less than the thickness of the battery cell. This structure can avoid utmost point ear to insert electric core and cause electric core short circuit.

In a second aspect, an electric core assembly is provided, which comprises a connecting sheet and the electric core, wherein the connecting sheet is connected with a tab to realize the conduction of current.

In a possible implementation manner, the electric core assembly includes a first connecting plate and two electric cores arranged side by side along the thickness direction of the electric cores, the tabs of the two electric cores are arranged on the same side of the electric core assembly, and the first connecting plate is connected with the tabs of the first polarity pole pieces of the two electric cores simultaneously.

Two electric cores in the structure share the connecting sheet to realize the leading-out of current.

In a possible implementation manner, the end portion of the battery cell extending out of the tab has a first side edge and a second side edge which are arranged along the thickness direction of the battery cell, the tab is arranged on the first side edge, and the first side edges of the two battery cells are attached to the setting.

This structure makes the utmost point ear of two electric cores be close to the setting for the area that is used for connecting the connection piece of two electric cores is less, has reduced the quantity of connection piece, is favorable to reducing electric core weight and spare part cost, improves electric core energy density.

In one possible embodiment, the third tab segments of the two cells extend in the direction toward one another. The structure is beneficial to welding the lug and the connecting sheet.

In a third aspect, a battery is provided, which includes a housing and the above-mentioned electric core assembly, and the electric core assembly is disposed in the housing. The battery core component of the battery is small in weight, the improvement of the energy density of the battery core is facilitated, the failure rate of the battery core of the battery is low, and the service life of the battery is long.

In a fourth aspect, there is provided an apparatus for using a battery, comprising the above battery. The device has the advantages of low battery failure rate, long service life and high cell energy density.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a first view angle of an electrical core assembly provided in an embodiment of the present application;

FIG. 2 is a schematic diagram of an electrical core assembly according to an embodiment of the present disclosure from a second perspective;

fig. 3 is a schematic structural diagram of a first battery cell provided in an embodiment of the present application;

fig. 4 is a schematic partial structure diagram of a first battery cell provided in an embodiment of the present application;

fig. 5 is a schematic partial structure diagram of another first battery cell provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a first battery cell and a second battery cell provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a battery provided in an embodiment of the present application.

Icon: 10-a battery; 100-an electric core component; 110-a first connecting piece; 120-a second connecting piece; 200-a first cell; 210-a first tab; 211-a first tab segment; 212-a first bend section; 213-second ear segment; 214-a second bend section; 215-third ear segment; 216-a first side edge; 217-second side edge; 220-a second tab; 300-a second cell; 310-a third tab; 320-a fourth tab.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the application are used, and are only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 and fig. 2, fig. 1 and fig. 2 are schematic structural diagrams of a first viewing angle and a second viewing angle of a power core assembly 100 provided in this embodiment, respectively.

The present embodiment provides an electric core assembly 100, which includes a first connecting sheet 110, a second connecting sheet 120, a first electric core 200 and a second electric core 300, wherein the first electric core 200 and the second electric core 300 are arranged side by side along the thickness direction of the electric core. The first connecting sheet 110 and the second connecting sheet 120 are connected to the first battery cell 200 and the second battery cell 300, the first connecting sheet 110 is used for leading out a current of a positive electrode in the first battery cell 200, and the second connecting sheet 120 is used for leading out a current of a negative electrode in the second battery cell 300. In the embodiment of the present application, the first cell 200 and the second cell 300 have the same structure. The first battery cell 200 will be described in detail below as an example.

The first cell 200 includes a first polarity pole piece, a second polarity pole piece, and a separator disposed between the first polarity pole piece and the second polarity pole piece. Wherein the first polarity and the second polarity are a positive electrode and a negative electrode, respectively. The first polar piece and the second polar piece can be stacked or wound. In the present embodiment, the first battery cell 200 is formed by winding a first polarity pole piece, a separator and a second polarity pole piece together.

Referring to fig. 1 and fig. 3, fig. 3 is a schematic structural diagram of a first battery cell 200 provided in this embodiment. The first polar plate includes a first body and a first conductive portion extending from the first body, and a plurality of first conductive portions are stacked to form a first tab 210. The first body in the embodiment of the application is composed of a current collector and active materials arranged on two sides of the current collector, and the first conductive part is a current collector extending out of the first body. In the present embodiment, the first polar plate includes a first tab 210, i.e. the current on the first polar plate is led out through the first tab 210. The second pole piece has a second pole lug 220 for drawing current, and the second pole lug 220 has the same structure as the first pole lug 210. In other embodiments of the present application, the first polarity pole piece may include a plurality of first tabs 210, and the current is drawn through the plurality of first tabs 210. The structure of the second tab 220 may be other structures. The first tab 210 will be described in detail below as an example.

The current tab has a certain length, and the tab is bent during the assembly process because the internal space of the battery 10 is limited. If the angle that utmost point ear was buckled is improper, and utmost point ear exists the risk that causes the problem in inserting electric core. In order to avoid insertion of the tabs into the cells, one approach is to make the tabs shorter. Because the tip of utmost point ear is connected with the adaptor after buckling, buckles and can cause the tip dislocation, and the utmost point ear in the outside is the biggest for the utmost point ear dislocation degree of the most inboard, and the thickness of utmost point ear is big more, and this dislocation degree is big more, and the utmost point ear sets up shorter, probably leads to the utmost point ear in the outside to be unable to be connected with the adaptor. And the tab is short and easy to break, and is not easy to be electrically connected with the top cover. Another method is to arrange the tabs longer, and although the length of the tabs can ensure the connection of the tabs with the adapter, the redundancy of the innermost bent tabs is high, which easily causes the tabs to be electrically connected with other components in the battery 10, and causes internal short circuit of the battery 10, resulting in damage to the battery 10. This application improves the structure of buckling of utmost point ear for utmost point ear can enough be connected with the adaptor, can avoid the utmost point ear of the most inboard again to take place to be connected with electric core electricity, arouses the inside short circuit scheduling problem of battery 10.

First utmost point ear 210 in this application extends the back from first body, carries out the first time and buckles to the direction of keeping away from first body, extends one section distance after, carries out the second time to the direction of keeping away from first body again and buckles, extends one section distance again and is connected with the connection piece, and first utmost point ear 210 forms S type structure through buckling twice promptly.

Referring to fig. 4, fig. 4 is a schematic view of a partial structure of a first battery cell according to an embodiment of the present disclosure. Specifically, the first tab 210 extends from one end of the battery core, and the first tab 210 includes a first tab section 211, a first bending section 212, a second tab section 213, a second bending section 214, and a third tab section 215, which are connected in sequence. One end of the first tab section 211 is connected to the first body, and the other end of the first tab section is connected to the first bending section 212 after extending for a distance along a direction parallel to the thickness of the battery cell. The first bending section 212 extends in a direction away from the first body relative to the first tab section 211, so that the first tab 210 is away from the first battery cell 200, and the innermost tab is prevented from being electrically connected with the pole piece with opposite polarity in the first battery cell 200. One end of the second tab segment 213 is connected to the first bent segment 212, and the other end extends in a direction parallel to the thickness of the battery cell and is connected to the second bent segment 214. The second bent section 214 extends in a direction away from the first body relative to the second tab section 213, so that the first tab 210 is further away from the battery cell. One end of the third tab segment 215 is connected to the second bent segment 214, and the other end extends in a direction parallel to the thickness of the battery cell.

The innermost tab formed after the first tab 210 is bent once becomes the outermost tab after the second bending, so that the problem that the innermost tab after the first bending has high redundancy and is easily electrically connected with the pole piece with opposite polarity in the battery cell is solved.

It should be noted that the length of the first tab 210 is not longer, and the length of the first tab section 211, the second tab section 213, and the third tab section 215 is preferably smaller than the thickness of the first battery cell 200. Further, the lengths of the first tab segment 211, the second tab segment 213, and the third tab segment 215 are preferably less than one-half of the thickness of the first battery cell 200.

Referring to fig. 3 and 4, in the present embodiment, the first battery cell 200 has a first end, and the first tab 210 extends from the first end to the first battery cell 200. The first end has a first side 216 and a second side 217 arranged along the thickness direction of the first cell 200, the first tab segment 211 extends from the center of the first cell 200, extends toward the direction close to the first side 216, extends to the vicinity of the first side 216, and is connected to the first bending segment 212, the first bending segment 212 is bent upward and is connected to the second tab segment 213, the second tab segment 213 extends toward the direction close to the center of the first cell 200 (in this embodiment, the extending direction of the second tab segment 213 is opposite to the extending direction of the first tab segment 211), the second tab segment 213 extends for a certain distance and is connected to the second bending segment 214, the second bending segment 214 is bent upward and is connected to the third tab segment 215, the bending directions of the first bending segment 212 and the second bending segment 214 are completely opposite, the third tab segment 215 extends for a certain distance toward the direction close to the third side 216 (in this embodiment, the third tab segment 215 extends in the same direction as the first tab segment 211).

Referring to fig. 5, in other embodiments of the present disclosure, the first tab segment 211 may extend from a position of the first battery cell 200 close to the first side 216, extend a certain distance in a direction close to the center of the first battery cell 200, and then be connected to the first bending segment 212, the first bending segment 212 is bent upward and then connected to the second tab segment 213, the second tab segment 213 is extended a certain distance in a direction close to the first side 216 and then connected to the second bending segment 214, the second bending segment 214 is bent upward and then connected to the third tab segment 215, and the third tab segment 215 extends in a direction close to the center of the first battery cell 200. The first tab 210 obtained by the extension method also has an S-shaped structure, and only the direction of bending and extension is different from the first tab 210.

The two bending manners may obtain a tab structure in which the first tab 210 is disposed on the first side 216, and the position of the first tab 210 may be adjusted so that the first tab 210 is disposed at a position close to the center of the first battery cell 200.

In some embodiments of the present application, the first bending section 212 and the second bending section 214 have the same bending radian, and the structure enables the first tab section 211, the second tab section 213, and the third tab section 215 to be arranged in parallel, and meanwhile, the length of the innermost tab generated by the first tab 210 during the first bending is greatly reduced during the second bending, so that the first tab section 211, the second tab section 213, and the third tab section 215 are relatively flat.

The application provides an electric core is through carrying out twice bending type to utmost point ear and forming S type structure, and this structure helps avoiding utmost point ear to buckle the most inboard utmost point ear that once appears verbose, and then avoids utmost point ear to insert in the electric core, reduces the probability that electric core broke down.

Referring to fig. 1 and fig. 6, fig. 6 is a schematic structural diagram of a first battery cell 200 and a second battery cell 300 according to an embodiment of the present application. The electric core assembly 100 in the embodiment of the present application includes two electric cores, i.e., a first electric core 200 and a second electric core 300. First electric core 200 and second electric core 300 set up side by side along the thickness direction of electric core, and the utmost point ear of first electric core 200 and second electric core 300 all sets up in same one side of electric core subassembly 100, and the utmost point ear of being convenient for is connected with the adaptor. Specifically, the first polarity pole piece of the first cell 200 has a first tab 210, the second polarity pole piece has a second tab 220, the first polarity pole piece of the second cell 300 has a third tab 310, and the second polarity pole piece has a fourth tab 320. The first connection tab 110 is simultaneously connected to the first tab 210 of the first battery cell 200 and the third tab 310 of the second battery cell 300, and the second connection tab 120 is simultaneously connected to the second tab 220 of the first battery cell 200 and the fourth tab 320 of the second battery cell 300. The first connecting piece 110 and the second connecting piece 120 are used for respectively leading out current on the first polarity pole piece and the second polarity pole piece.

The end of the first battery cell 200 in this embodiment, from which the tab extends, has a first side 216 and a second side 217 arranged along the thickness direction of the first battery cell 200, and the first tab 210 and the second tab 220 are arranged on the first side 216 of the first battery cell 200. Since the first battery cell 200 and the second battery cell 300 have the same structure and are mirror-symmetrical, the end of the second battery cell 300, from which the tabs extend, also has a first side 216 and a second side 217, and the third tab 310 and the fourth tab 320 are disposed on the first side 216 of the second battery cell 300. The first sides 216 of the first cell 200 and the second cell 300 are placed against each other, such that the first tab 210 and the third tab 310 are close to each other, and the second tab 220 and the fourth tab 320 are close to each other. This structure makes the area of first connection piece 110 and second connection piece 120 less, has reduced the quantity of connection piece, is favorable to reducing electric core weight and spare part cost, improves electric core energy density.

If the second side 217 of the first battery cell 200 and the second side 217 of the second battery cell 300 are disposed adjacent to each other, the first tab 210 and the third tab 310, and the second tab 220 and the fourth tab 320 are disposed on two sides of the battery assembly 100. This structure makes the first connecting piece 110 and the second connecting piece 120 have a large area, which is not beneficial to improving the cell energy density.

The tab in the application is connected with the connecting piece in a welding mode, and in the welding process, after the tab of the battery cell is welded with the connecting piece in an ultrasonic welding mode, the connecting piece is welded with the top cover in a laser welding mode, and finally, the two battery cells are combined into a core and the tab is bent into the S shape. The third tab segment 215 of the tab of the first cell 200 and the third tab segment 215 of the tab of the second cell 300 in this application both extend in a direction close to the first side 216, i.e., in a direction close to the adjacent cells. This structure helps carrying out the connection of utmost point ear and connecting piece earlier, carries out the core that closes of electric core again. If the third tab segments 215 of the tabs of the first cell 200 and the second cell 300 respectively extend toward the center of the respective cells, the structure is not favorable for welding.

The application provides an electricity core subassembly 100 is close to the setting through the utmost point ear with two adjacent electric cores each other, reduces the area of connecting piece, reduces the quantity of connecting piece material, is favorable to reducing electric core weight and spare part cost, improves electric core energy density. This electric core subassembly 100 adopts electric core carries out twice bending type and becomes S type structure, helps avoiding utmost point ear bending type one time the most inboard utmost point ear that appears long, and then avoids during utmost point ear inserts electric core, reduces the probability that electric core broke down.

Referring to fig. 7, the present application further provides a battery 10 including a housing and a core assembly 100, wherein the core assembly 100 is disposed in the housing. The cell assembly 100 of the battery 10 is light in weight, which helps to improve the cell energy density, the cell failure rate of the battery 10 is low, and the service life of the battery 10 is long.

The application also provides a device using the battery, which comprises the battery 10, wherein the failure rate of the battery 10 of the device is low, the service life is long, and the energy density of the battery core is high.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric core is characterized by comprising a first polar piece, a second polar piece and a diaphragm arranged between the first polar piece and the second polar piece;

the first polar piece comprises a body and a conductive part extending from the body, a plurality of conductive parts are laminated to form a polar lug, the tab comprises a first tab section, a first bending section, a second tab section, a second bending section and a third tab section which are connected in sequence, one end of the first tab section is connected with the body, the other end is connected with the first bending section, the first bending section extends towards the direction far away from the body relative to the first tab section, one end of the second tab section is connected with the first bending section, and the other end extends along the direction parallel to the thickness of the battery cell, the second bending section extends towards the direction far away from the body relative to the second pole ear section, one end of the third pole ear section is connected with the second bending section, and the other end of the third pole ear section extends along the direction parallel to the thickness of the battery core.

2. The cell of claim 1, wherein the first bend section and the second bend section have the same bend degree.

3. The cell of claim 2, wherein the first tab segment extends from the body in a direction away from a center of the cell, the second tab segment extends in a direction closer to the center of the cell, and the third tab segment extends in a direction away from the center of the cell.

4. The cell of claim 3, wherein the first tab segment, the second tab segment, and the third tab segment each have a length that is less than a thickness of the cell.

5. An electric core assembly, comprising a tab and an electric core as claimed in any of claims 1 to 4, wherein the tab is connected to the tab to allow conduction of current.

6. The battery core assembly of claim 5, wherein the battery core assembly comprises a first connecting tab and two battery cores arranged side by side along a thickness direction of the battery cores, the tabs of the two battery cores are arranged on the same side of the battery core assembly, and the first connecting tab is simultaneously connected with the tabs of the first polarity pole pieces of the two battery cores.

7. The battery pack of claim 6, wherein the cells have first ends, the tabs extend from the first ends, the first ends have first and second sides disposed along the thickness direction of the cells, the tabs are disposed on the first sides, and the first sides of the two cells are disposed in an abutting manner.

8. The battery core assembly of claim 7, wherein the third tab segments of two of the battery cells extend in a direction toward each other.

9. A battery comprising a housing and a plug assembly according to any one of claims 5 to 8, said plug assembly being disposed within said housing.

10. A device using a battery, comprising the battery according to claim 9.