CN216793941U

CN216793941U - Battery, battery pack, battery pole piece and battery cell

Info

Publication number: CN216793941U
Application number: CN202220386250.3U
Authority: CN
Inventors: 孙倩倩; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-06-21
Anticipated expiration: 2032-02-24

Abstract

The utility model relates to the technical field of batteries, and provides a battery, a battery pack, a battery pole piece and a battery core. The battery includes a battery case; an electrode post, which is at least partially placed in the battery case, and the part of the electrode post placed in the battery case has a protruding part; a battery cell, which is arranged in the battery case; The core body and the tabs are provided with grooves on the side of the tabs away from the cell body; at least part of the protruding parts are placed in the grooves, and the protruding parts are in contact with at least part of the inner wall of the grooves. By contacting the bottom and/or side walls of the groove, the pole post in the battery provided by the present application can realize the electrical connection between the pole post and the battery cell, thereby ensuring the current transmission path and improving the overall overcurrent capability. At the same time, the structural arrangement that the protruding portion is at least partially placed in the groove can prevent the protruding portion of the pole post from occupying a large space alone inside the battery case, thereby improving the overall space utilization of the battery.

Description

Battery, battery pack, battery pole piece and battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery, a battery pack, a battery pole piece and a battery cell.

Background

In the related art, a battery includes a terminal and a battery case. When the battery is assembled, the pole can partially extend into the battery shell so as to be connected with the battery core in the battery shell. However, the protruding terminal post occupies a large space inside the battery.

Therefore, how to avoid the terminal from occupying a large space inside the battery is an urgent technical problem to be solved.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery, a battery pack, a battery pole piece and a battery cell, which are used for reducing the independent occupation space of a pole in the battery, thereby improving the utilization rate of the space in the battery.

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

according to a first aspect of the present invention, there is provided a battery comprising:

a battery case;

the pole is at least partially arranged in the battery shell, and the part of the pole arranged in the battery shell is provided with a convex part;

the battery core is arranged in the battery shell; the battery cell comprises a battery cell main body and a lug, and a groove is formed in one side of the lug, which deviates from the battery cell main body; at least a portion of the projection is disposed within the groove and the projection is in contact with at least a portion of the inner wall of the groove.

The battery that this application provided includes battery case, utmost point post and electric core, and wherein, the battery case is arranged in to utmost point post part at least inside, and inside battery case was arranged in completely to electric core. Specifically, the projection of the terminal is at least partially inserted into the groove of the tab, while the projection inserted into the groove is in contact with at least part of the inner wall of the groove. It should be noted that the terminal post is in contact with the bottom and/or the side wall of the groove, so that the electric connection between the terminal post and the battery cell can be realized, a current transmission path can be ensured, and the overall overcurrent capacity can be improved. Meanwhile, the structure that the groove is arranged in at least part of the protruding part can prevent the protruding part of the pole column from occupying a larger space inside the battery shell, so that the overall space utilization rate of the battery can be improved.

Therefore, the battery provided by the application can improve the utilization rate of the space in the battery on the premise of keeping the performance of the battery, and is convenient for reducing the volume of the battery.

According to a second aspect of the present invention, there is provided a battery pack comprising a battery as provided in any of the above claims.

In the battery pack provided by the application, the battery inner pole column is in contact with the bottom and/or the side wall of the groove, so that the electric connection of the pole column and the battery cell can be realized, and a current transmission path can be ensured to improve the overall overcurrent capacity. Simultaneously, because the bulge is at least partly arranged in the recess, can avoid the bulge of utmost point post to occupy great space alone in battery case to can improve the holistic space utilization of battery.

According to a third aspect of the utility model, a battery pole piece is provided, which comprises a pole piece body and a pole lug, wherein at least one part of one end of the pole lug, which is far away from the pole piece body, is provided with a groove; the groove comprises a bottom wall and a side wall, and the bottom wall of the groove is formed by the tab.

When the battery pole piece provided by the application is applied, the grooves arranged at the tabs can be used for accommodating at least parts of other protruding structures. Exemplarily, the projection of utmost point post can at least partially insert in the recess of utmost point ear to avoid the projection of utmost point post to occupy great space alone inside the battery case, thereby can improve the holistic space utilization of battery. Meanwhile, the protruding part inserted into the groove can be in contact with at least part of the inner wall of the groove to realize the electric connection of the pole and the battery pole piece, so that a current transmission path can be ensured, and the overall overcurrent capacity is improved.

It is worth noting that the bottom wall of the groove is formed by the pole lugs, so that the pole can be prevented from contacting with the pole piece body and generating short circuit.

According to a fourth aspect of the utility model, a battery cell is provided, which includes a battery cell main body and a tab, wherein at least a part of one end of the tab, which is far away from the battery cell main body, is provided with a groove; the groove comprises a bottom wall and a side wall, and the bottom wall of the groove is formed by the tabs;

the battery cell comprises a front end and a rear end, the front end is used for facing the pole, and the groove is located at the front end.

The application provides an electric core includes electric core main part and utmost point ear, and wherein, the one end that electric core main part was kept away from to utmost point ear is equipped with the recess, and the diapire of this recess is formed by utmost point ear. When the battery cell provided by the application is applied, the grooves formed in the tabs can be used for accommodating at least parts of other protruding structures. Exemplarily, the protruding portion of the terminal can be at least partially arranged in the groove at the front end of the battery core, so that the protruding portion of the terminal is prevented from independently occupying a larger space in the battery shell, and the overall space utilization rate of the battery can be improved. Meanwhile, the protruding part inserted into the groove can be in contact with at least part of the inner wall of the groove to realize the electric connection of the pole and the battery cell, so that a current transmission path can be ensured, and the overall overcurrent capacity is improved. It is worth noting that the bottom wall of the groove is formed by the pole lugs, so that the pole can be prevented from contacting with the pole piece body and generating short circuit.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

fig. 1 is a schematic structural diagram of a battery provided in an embodiment of the present application;

fig. 2 is a schematic perspective view of a battery cell in a battery provided in an embodiment of the present application;

FIG. 3 is a cross-sectional view at plane M of FIG. 1;

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

fig. 5 is a schematic structural diagram of a battery according to an embodiment of the present disclosure after a current collecting plate and a terminal are assembled.

The reference numerals are explained below:

10-a battery case; 11-a housing part; 12-a cover plate; 20-pole column; 21-a projection; 211-riveting holes; 30-electric core; 33-a groove; 31-a cell main body; 32-pole ear; 321-front section tab; 322-rear tab; 40-current collecting disc.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the" object or "an" object are also intended to mean one of possibly multiple such objects.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

In a first aspect, an embodiment of the present application provides a battery. Fig. 1 is a schematic structural diagram of a battery provided in an embodiment of the present application. Fig. 2 is a schematic perspective view of a battery cell 30 in a battery provided in an embodiment of the present application; fig. 3 is a cross-sectional view at plane M in fig. 1. Referring to the structures shown in fig. 1, fig. 2 and fig. 3, the battery includes:

a battery case 10;

the pole post 20, the pole post 20 is at least partially arranged in the battery shell 10, and the part of the pole post 20 arranged in the battery shell 10 is provided with a convex part 21; it will be appreciated that the projections 21 are schematically divided in fig. 3 using dashed lines;

the battery core 30, the battery core 30 is arranged in the battery shell 10; the battery cell 30 comprises a battery cell main body 31 and a tab 32, wherein a groove 33 is formed in one side of the tab 32, which is far away from the battery cell main body 31; at least a portion of projection 21 is disposed within groove 33 and projection 21 contacts at least a portion of the inner wall of groove 33.

The battery provided by the embodiment of the application includes a battery case 10, a pole post 20 and a battery core 30, wherein the pole post 20 is partially disposed inside the battery case 10, the battery core 30 is completely disposed inside the battery case 10, as shown in fig. 1, fig. 2 and fig. 3, for example, after the battery core 30 and the pole post 20 are mounted on the battery case 10, the battery core 30 and the pole post 20 are arranged along the arrow direction shown in fig. 3.

It should be noted that, the protruding portion 21 of the terminal 20 is at least partially inserted into the groove 33 of the tab 32, so that the occupied space of the terminal 20 alone can be reduced along the arrow direction, and the protruding portion 21 of the terminal 20 is prevented from occupying a larger space inside the battery case 10 alone, thereby improving the space utilization rate of the whole battery.

Meanwhile, the projection 21 inserted into the groove 33 is in contact with at least part of the inner wall of the groove 33. Specifically, the terminal 20 is in direct contact with the bottom and/or the side wall of the groove 33, so that the terminal 20 can be electrically connected to the battery cell 30, and a current transmission path can be ensured to improve the overall overcurrent capacity.

Therefore, the battery provided by the embodiment of the application can improve the utilization rate of the space in the battery on the premise of keeping the performance of the battery, and can be convenient for reducing the volume of the battery.

It should be understood that the cell body 31 and the tab 32 are schematically separated by a dotted line in fig. 3.

Note that the grooves 33 may be formed by cutting the tab 32 or bending the tab 32. In a specific embodiment, the portion of the tab 32 corresponding to the bottom of the groove 33 may be cut to a certain length so that the tab 32 fits into the groove 33. It should be understood that the bottom of the groove 33 may be flat, concave-convex, or sloped. Specifically, when the bottom of the groove 33 is a plane, the tab 32 forming the bottom of the groove 33 is cut at the same length throughout; when the bottom of the groove 33 is a concave-convex surface or a slant surface, the cutting lengths of the tab 32 forming the bottom of the groove 33 are different.

It is noted that the side walls of the groove 33 may be provided as a plane, a concave-convex surface or a slant surface. Specifically, the side walls of the grooves 33 may be formed by the tabs 32 that are uncut or partially cut. When the side walls of the grooves 33 are flat, they may be formed by the uncut tabs 32; when the side walls of the grooves 33 are concave-convex surfaces or inclined surfaces, they can be formed by fitting the uncut or partially cut tabs 32.

Because the side wall and the bottom of the groove 33 are both formed by the tabs 32, the pole 20 arranged in the groove 33 can be directly and electrically connected with the tabs 32, so that the flow area of the pole 20 and the tabs 32 can be ensured, and the overall overcurrent capacity is improved.

It should be understood that the cell body 31 may be formed by winding, or may be stacked and prepared by a lamination process. When the cell main body 31 is formed by winding, the cell main body 31 is also called a winding core main body, and the winding core main body may be a cylinder shape matching the shape of the casing member 11 shown in fig. 3, and may also be a square column shape, which is not described herein again. In forming the core body, a support member is typically employed as an internal support member for the winding structure. Illustratively, taking the support member as a cylindrical shape as an example, the specific process of forming the winding core is as follows: forming a roll core around the support member by using a material belt; and after the winding core is formed, the supporting piece in the winding core is withdrawn.

In addition, it should be noted that the material strap is formed by a diaphragm and a pole piece, specifically, the pole piece includes a first pole piece and a second pole piece, and the first pole piece and the second pole piece are located on two sides of the diaphragm. When the first pole piece is positive, the second pole piece is negative. And the polarities of the first pole piece and the second pole piece can be interchanged. It should be noted that the first pole piece is connected to the pole post 20, or the second pole piece is connected to the pole post 20.

In one embodiment, the cell main body 31 is a winding core structure, as shown in fig. 4, the tab 32 includes a front tab 321 and a rear tab 322, the front tab 321 forms the bottom of the groove 33, and the rear tab 322 forms the sidewall of the groove 33; the size h of the front tab 321 is 2 mm-5 mm along the direction of the battery cell main body 31 pointing to the tab 32.

It is noted that the structure of fig. 4 is shown with the same cut size throughout the front tab 321. Of course, when the size h of each position of the front section tab 321 is within the range of 2 mm-5 mm, the size of each position of the front section tab 321 may be set to be different, and at this time, the bottom of the groove 33 is a concave-convex surface or an inclined surface.

It should be noted that the h value of the tab 32 from the pole piece is too small, which easily causes the pole 20 to be electrically connected with pole pieces with different polarities inside, so that there is a risk of short circuit, and meanwhile, the h value is too small, which may cause the current transmission rate of the pole 20 electrically connected with the tab 32 to be limited; the distance between the tab 32 and the pole piece h is too large, which easily causes the formation of a small groove 33 and a small protrusion 21 which cannot fully accommodate the pole 20, and can cause the internal space utilization rate to be low.

Illustratively, h values of 2.0mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.25mm, 4.5mm, 4.75mm, 5mm may be selected.

It is noted that there are various ways to remove the front tab 321, and in one possible implementation: before winding to form a winding core main body, the front tab 321 is cut to a certain size. After the winding operation is completed, the front tab 321 forms the bottom of the groove 33 and the rear tab 322 forms the side wall of the groove 33. The method can simplify the preparation process of the battery provided by the embodiment of the application, so that the production efficiency can be improved. In another possible implementation: the battery core 30 is formed by winding, and then the front tab 321 corresponding to the groove 33 is cut off.

In one embodiment, with continued reference to the structures shown in fig. 3 and fig. 4, when the cell main body 31 is a cylindrical winding core structure, the length L of the front tab 321 shown in fig. 4 affects the diameter D of the groove 33 shown in fig. 2.

In a particular embodiment, the width D of the groove 33 may be provided in the range of 3.5mm to 15 mm.

It should be noted that, when the width D of the groove 33 is set within the above range, on one hand, the space utilization rate in the battery can be improved by the cooperation of the groove 33 and the protrusion 21; on the other hand, the phenomenon that the overcurrent capacity is influenced by overlarge cutting size of the pole 20 can be avoided.

Preferably, the width D of the groove 33 ranges from 8mm to 12 mm.

It should be noted that, when the width D of the groove 33 is set to any value within 8mm to 12mm, the improvement of space utilization rate and the overcurrent capacity in the battery can be better balanced.

By way of example, values for D of 8mm, 8.25mm, 8.5mm, 8.75mm, 9mm, 9.25mm, 9.5mm, 9.75mm, 10mm, 10.25mm, 10.5mm, 10.75mm, 11mm, 11.25mm, 11.5mm, 11.75mm, 12mm may be selected.

In a particular embodiment, the projections 21 may be in full contact with the side walls of the groove 33 to increase the flow area; alternatively, the projection 21 may be in full contact with the bottom of the groove 33 to increase the flow area. Of course, the protrusion 21 can be completely contacted with the bottom and the side wall of the groove 33, so as to further increase the flow area and improve the flow capacity.

In one embodiment, with continued reference to the structure shown in fig. 3, the battery provided by the embodiments of the present application further includes a current collecting disk 40. The current collecting disk 40 is disposed in the battery case 10, and the current collecting disk 40 has a through hole, and the post 20 is inserted into the through hole and electrically connected to the current collecting disk 40. It is noted that, referring to the structure shown in fig. 5, the protrusion 21 is located on the side of the collecting tray 40 facing the core.

Note that the cell main body 31 is electrically connected to the current collecting plate 40 via the tab 32. It will be appreciated that since the current collecting disc 40 has a large area, the connection area of the tab 32 and the post 20 can be increased by providing the current collecting disc 40 to increase the current capacity. Meanwhile, the projection 21 of the pole 20 is at least partially placed in the groove 33, so that a large gap between the current collecting disc 40 and the battery shell 10 can be compensated, and accordingly, the utilization rate of the internal space of the battery is improved.

In a specific embodiment, the current collecting disc 40 and the tab 32 may be electrically connected by a direct contact connection, and for example, the tab 32 on one side of the cell body 31 directly abuts against one side of the current collecting disc 40; in another embodiment, the current collecting plate 40 and the tab 32 may be electrically connected by welding; in another embodiment, the current collecting plate 40 and the tab 32 may be electrically connected by means of conductive adhesive bonding. The setting can be specifically carried out according to the requirements, and the detailed description is omitted here.

With continued reference to the structure shown in fig. 3, the battery case 10 includes a case member 11 and a cover plate 12, and the cover plate 12 is connected to the case member 11 to seal the battery cell 30.

It should be noted that, the sealing connection between the housing member 11 and the cover plate 12 can prevent the electrolyte injected into the battery case 10 from overflowing, so as to improve the safety performance of the battery.

In one embodiment, the battery provided by the embodiment of the present application is a cylindrical battery. Specifically, the housing member 11 may be a cylindrical structure, and the housing member 11 includes an annular side plate and a bottom plate, the bottom plate seals one end of the annular side plate, and the cover plate 12 seals the other end opening of the annular side plate. In one possible embodiment, the housing part 11 is of one-piece design.

It should be noted that, when the shell member 11 is an integral molding structure, not only the manufacturing process can be simplified, but also the strength of the shell member 11 can be enhanced, so as to improve the service life. When the housing member 11 provided in the embodiment of the present application is applied, the battery cell 30 may be extended into the housing member 11 from the opening side, so as to complete the operation of inserting the battery cell 30 into the housing.

In one embodiment, the pole 20 is provided on the housing piece 11 as shown in fig. 3. Of course, the pole 20 can be disposed on a separate cover plate 12, which will not be described herein.

It should be noted that the pole 20 may be mounted to the housing member 11 before the cell 30 is inserted into the housing.

In a specific embodiment, the pole 20 is connected to the housing part 11 by riveting. Here, "caulking" means fixing the structural member a and the structural member B together by the structural member C. After the fixation is completed, the structural member C is not retained on the structural member a and the structural member B, or the structural member C is partially retained on the structural member a and/or the structural member B. For example, the pole 20 and the shell member 11 may be connected by press riveting, roll riveting, pull riveting, or the like. It should be understood that when the post 20 is disposed in different positions and shapes of the riveting holes 211, the riveting direction and the riveting form will be changed.

In an embodiment, with continued reference to the structure shown in fig. 3, a riveting hole 211 may be disposed on a side of the pole 20 facing the battery cell 30. Specifically, when the riveting holes 211 are located inside the battery case 10, the structural member C may extend into the case member 11 to complete the riveting operation, or the bottom plate and the post 20 may be riveted first, and then the annular side plate of the case member 11 is prepared.

Now, a schematic description is provided of a method for connecting the pole 20 and the shell member 11 by selecting a press-riveting method, and the specific process engineering is as follows:

when the current collecting disc 40 and the pole 20 are assembled, the pole 20 partially passes through the through hole of the current collecting disc 40, and one side of the current collecting disc 40 is abutted with the abutting table on the peripheral side of the pole 20; thereafter, a press-riveting process may be performed using other equipment to rivet the current collecting plate 40 with the pole post 20. In the press riveting process, a protruding part 21 is formed at one end of the pole 20, which extends out of the through hole, and the protruding part 21 is matched with the abutting table and limits the position of the current collecting disc 40 along the arrow direction so as to enhance the stability of the connection relationship between the current collecting disc 40 and the pole 20.

It is to be noted that, in order to avoid deformation of the current collecting plate 40 during caulking, the large face of the current collecting plate 40 (i.e., the surface of the current collecting plate 40 facing the battery case 10) may be disposed without a gap from the battery case 10. It should be understood that the "gapless arrangement" means that other structures are provided between the cell case 10 and the current collecting disk 40, and the other structures support the current collecting disk 40 during the riveting process, so that the overall structural stability of the current collecting disk 40 can be improved.

Illustratively, "other structure" includes an insulating structure for insulating the terminal post 20 and the battery case 10. The insulating structure can prevent a short circuit from occurring between the current collecting plate 40 and the battery case 10 while exerting a supporting function. Of course, the "other structures" may also include other structures according to the requirement, and are not described herein again.

In one embodiment, when the terminal post 20 is disposed on the housing member 11 and the staking hole 211 is disposed on the side of the terminal post 20 facing the battery cell 30, the pour hole may be disposed on the separate cover plate 12. In other words, if the end of the housing member 11 where the pole post 20 is disposed is the top, the liquid injection hole may be disposed at the bottom opposite to the top, i.e., the cover plate 12 disposed at the bottom.

It should be understood that, since the liquid injection hole is formed in the cover plate 12 at the bottom of the battery, the electrode post 20 is no longer provided with the liquid injection hole, and the flatness of the surface of one side of the electrode post 20 facing away from the battery cell 30 can be ensured. For example, a surface of the pole 20 facing away from the battery cell 30 may be a plane.

It should be understood that the terminal post 20 needs to be connected to the external bus bar, so that when the flatness of the side of the terminal post 20 away from the battery cell 30 is raised, the overcurrent capacity between the terminal post 20 and the external bus bar can be raised.

In a second aspect, an embodiment of the present application provides a battery pack, including any one of the batteries provided in the above technical solutions.

The battery inner pole 20 in the battery pack provided by the embodiment of the application can realize the electric connection of the pole 20 and the battery core 30 through the direct contact with the bottom and/or the side wall of the groove 33, so that the current transmission path is ensured, and the overall overcurrent capacity is improved. Meanwhile, because the protruding part 21 is at least partially arranged in the groove 33, the protruding part 21 of the pole 20 can be prevented from independently occupying a larger space in the battery shell 10, and therefore the overall space utilization rate of the battery can be improved.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery can be square battery, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixing a plurality of batteries. The battery can be a cylindrical battery, and the battery module can further comprise a bracket, and the battery can be fixed on the bracket.

The battery pack includes a plurality of batteries and a case for fixing the plurality of batteries.

It should be noted that, the battery pack includes a plurality of batteries, and a plurality of batteries are disposed in the box body. Wherein, a plurality of batteries can form and install in the box behind the battery module. Or, a plurality of batteries can directly set up in the box, need not to carry out the group to a plurality of batteries promptly, utilizes the box to fix a plurality of batteries.

In a third aspect, an embodiment of the present application provides a battery pole piece. For example, as shown in fig. 3, the battery pole piece provided in the embodiment of the present application includes a pole piece body and a tab 32, where at least a portion of one end of the tab 32 away from the pole piece body is provided with a groove 33; the groove 33 includes a bottom wall and a side wall, and the bottom wall of the groove 33 is formed by the tab 32.

When the battery pole piece provided by the embodiment of the application is applied, the groove 33 provided at the tab 32 can be used for accommodating at least part of other protruding structures. For example, as shown in fig. 3, the protruding portion 21 of the terminal post 20 may be at least partially inserted into the groove 33 of the tab 32, so as to avoid the protruding portion 21 of the terminal post 20 from occupying a large space inside the battery case 10 alone, and thus the space utilization rate of the whole battery may be improved. Meanwhile, the protrusion 21 inserted into the groove 33 may contact at least a portion of the inner wall of the groove 33 to achieve electrical connection of the post 20 and the battery pole piece, so that a current transmission path may be ensured to improve the overall overcurrent capability.

It is noted that, because the bottom wall of the groove 33 is formed by the tab 32, the contact between the pole post 20 and the pole piece body and the occurrence of short circuit can be avoided.

It is to be understood that the wound or folded battery pole piece may form a cell 30 as shown in fig. 3, wherein the body of the pole piece cooperates with the separator to form a cell body 31.

In a fourth aspect, an embodiment of the present application provides a battery cell 30. For example, as shown in fig. 2, a battery cell 30 provided in an embodiment of the present invention includes a cell main body 31 and a tab 32, where at least a portion of one end of the tab 32 away from the cell main body 31 is provided with a groove 33; the groove 33 includes a bottom wall and a side wall, and the bottom wall of the groove 33 is formed by the tab 32;

the battery cell 30 includes a front end and a rear end, the front end is used for facing the pole 20, and the groove 33 is located at the front end, for example, as shown in fig. 3.

When the battery cell 30 provided in the embodiment of the present application is applied, the groove 33 provided at the tab 32 may be used to accommodate at least part of other protruding structures. For example, as shown in fig. 3, the protruding portion 21 of the terminal post 20 may be at least partially disposed in the groove 33 at the front end of the battery cell 30, so as to avoid the protruding portion 21 of the terminal post 20 occupying a relatively large space inside the battery casing 10, and thus the space utilization rate of the whole battery may be improved. Meanwhile, the protrusion 21 inserted into the groove 33 may contact at least a portion of the inner wall of the groove 33 to electrically connect the terminal 20 and the battery cell 30, so that a current transmission path may be ensured to improve the overall overcurrent capability.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. a battery, is characterized in that, comprises:

battery housing (10);

A pole (20), the pole (20) is at least partially placed in the battery case (10), and the part of the pole (20) placed in the battery case (10) has a convex Exit (21);

A battery cell (30), the battery core (30) is provided in the battery housing (10); the battery core (30) comprises a battery core body (31) and a tab (32), the tab (32) A groove (33) is provided on the side away from the main body (31) of the battery cell; at least part of the protruding part (21) is placed in the groove (33), and the protruding part (21) is in contact with at least part of the inner wall of the groove (33).

2 . The battery according to claim 1 , wherein the main body ( 31 ) of the battery cell is of a winding core structure, and the tabs ( 32 ) comprise front tabs ( 321 ) and rear tabs ( 322 ). 3 . , the front tab (321) forms the bottom of the groove (33), and the rear tab (322) forms the side wall of the groove (33); along the battery core body (31) Point in the direction of the tab (32).

3 . The battery according to claim 2 , wherein the width D of the groove ( 33 ) ranges from 3.5 mm to 15 mm. 4 .

4 . The battery according to claim 3 , wherein the width D of the groove ( 33 ) ranges from 8 mm to 12 mm. 5 .

5. The battery according to any one of claims 1-4, characterized in that, the protruding portion (21) is in complete contact with the side wall of the groove (33); and/or,

The protrusion (21) is in complete contact with the bottom of the groove (33).

6. The battery according to any one of claims 1-4, characterized in that further comprising a current collecting plate (40), the current collecting plate (40) having a through hole, and the pole (20) passing through inside the through hole and electrically connected to the current collecting plate (40); the protruding portion (21) is located on the side of the current collecting plate (40) facing the battery core (30), the There is no gap between the large surface of the current collecting plate (40) and the battery casing (10).

7. The battery according to any one of claims 1-4, characterized in that the battery case (10) comprises a case member (11) and a cover plate (12), the cover plate (12) and the The housing parts (11) are connected to seal the battery core (30), and the housing parts (11) are integrally formed.

8. The battery according to claim 7, characterized in that, the pole (20) is riveted to the housing member (11), and the pole (20) faces the side of the battery core (30). One side is provided with a riveting hole (211).

9 . The battery according to claim 8 , characterized in that, the side of the pole ( 20 ) facing away from the battery cell ( 30 ) is a plane. 10 .

10 . The battery according to claim 1 , wherein the battery is a cylindrical battery. 11 .

11. A battery pack, characterized by comprising the battery according to any one of claims 1-10.

12. A battery pole piece, characterized in that it comprises a pole piece body and a pole lug (32), and at least part of the pole lug (32) away from one end of the pole piece body is provided with a groove (33); the The groove (33) includes a bottom wall and a side wall, and the bottom wall of the groove (33) is formed by the tabs (32).

13. A battery cell (30), characterized in that it comprises a battery core body (31) and a tab (32), wherein at least part of one end of the tab (32) away from the battery core body (31) is provided with a groove (33); the groove (33) includes a bottom wall and a side wall, and the bottom wall of the groove (33) is formed by the tabs (32);

The battery core (30) has a front end and a rear end, the front end is used to face the pole (20), and the groove (33) is located at the front end.