CN217881810U

CN217881810U - Battery with a battery cell

Info

Publication number: CN217881810U
Application number: CN202222088329.0U
Authority: CN
Inventors: 许久凌; 张勇杰; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2022-11-22
Anticipated expiration: 2032-08-09

Abstract

The utility model relates to a battery technology field provides a battery, include: a battery case; the battery comprises a battery cell, wherein the battery cell is arranged in a battery shell and comprises a battery cell main body and a pole ear part, the pole ear part extends out from one side of the battery cell main body, and a buffer part is formed at one side of the pole ear part connected with the battery cell main body; wherein, battery shell supports the setting of utmost point ear. Through being formed with the buffering portion in one side that utmost point ear is connected with electric core main part to in the battery assembling process, battery case supports and presses utmost point ear also can not make the junction of utmost point ear and electric core main part stress concentration appear, and the buffering portion can realize the release to stress promptly, thereby avoids utmost point ear to tear, with this security performance who improves the battery.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery technology field especially relates to a battery.

Background

In the related art, the tab portion of the battery cell is used to be electrically connected to an external structure, for example, to be electrically connected to a terminal assembly, and the tab portion may be pulled during the battery assembling process, so that the tab portion may be torn.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery to improve the performance of battery.

The utility model provides a battery, include:

a battery case;

the battery comprises a battery cell, wherein the battery cell is arranged in a battery shell and comprises a battery cell main body and a pole ear part, the pole ear part extends out from one side of the battery cell main body, and a buffer part is formed at one side of the pole ear part connected with the battery cell main body;

wherein, battery shell supports the setting of utmost point ear.

The utility model discloses battery includes battery case and electric core, and electric core sets up in the battery case. The battery core comprises a battery core main body and a pole ear part, and a buffer part is formed on one side connected with the battery core main body through the pole ear part, so that in the process of assembling the battery, the battery shell supports against the pole ear part, the stress concentration at the joint of the pole ear part and the battery core main body cannot occur, the buffer part can realize the release of the stress, and the pole ear part is prevented from being torn, so that the safety performance of the battery is improved.

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 so as 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 diagram of a battery shown in accordance with an exemplary embodiment;

FIG. 2 is an exploded schematic view of a battery according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating a cross-sectional configuration of a battery according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a portion of the structure of a battery according to one exemplary embodiment;

fig. 5 is a schematic structural diagram illustrating a cell and an interposer of a battery according to an exemplary embodiment.

The reference numerals are explained below:

10. a battery case; 11. a first surface; 12. a second surface; 13. a liquid injection hole; 14. recessing; 15. a first housing member; 16. a second housing member; 20. a pole assembly; 30. a support; 31. a guide portion; 311. a support surface; 3111. a plane; 3112. a bevel; 40. an electric core; 41. a cell main body; 42. a pole ear portion; 421. a buffer section; 50. a patch; 51. an accommodating space; 60. an insulating member.

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, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

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.

An embodiment of the present invention provides a battery, please refer to fig. 1 to 5, the battery includes: a battery case 10; the battery comprises a battery cell 40, the battery cell 40 is arranged in the battery shell 10, the battery cell 40 comprises a battery cell main body 41 and a tab part 42, the tab part 42 extends out from one side of the battery cell main body 41, and a buffer part 421 is formed on one side of the tab part 42 connected with the battery cell main body 41; wherein the battery case 10 is disposed against the tab portion 42.

The battery of an embodiment of the present invention includes a battery case 10 and an electric core 40, and the electric core 40 is disposed in the battery case 10. Battery 40 includes electric core main part 41 and utmost point ear 42, is formed with buffer 421 through the one side that is connected at utmost point ear 42 and electric core main part 41 to in the battery assembling process, battery case 10 supports and presses utmost point ear 42 and also can not make utmost point ear 42 and electric core main part 41 junction stress concentration appear, and buffer 421 can realize the release to stress promptly, thereby avoids utmost point ear 42 to tear, with this security performance who improves the battery.

It should be noted that, during the process of mounting the battery case 10, the battery case 10 may press the tab portion 42, so that the position of the tab portion 42 may change, and therefore, a large stress may be generated at the connection portion between the tab portion 42 and the cell main body 41, and if the stress is not released, the tab portion 42 may be torn. In this embodiment, the buffering portion 421 is formed on the side where the tab portion 42 is connected to the battery cell main body 41, so that in the process that the battery case 10 presses the tab portion 42, the tab portion 42 is buffered by the buffering portion 421, so as to release stress, and thus the tab portion 42 is prevented from being torn.

In one embodiment, the buffering portion 421 may be formed by a segment reserved in the tab portion 42, for example, a stacked structure is formed on the side where the tab portion 42 is connected to the cell main body 41, so that when the battery case 10 presses against the tab portion 42, the stacked structure is only flattened, and thus, a large pressure concentration is not generated, and the tab portion 42 is prevented from being torn.

In one embodiment, the tab portion 42 is recessed from a direction away from the surface of the battery case 10 pressed against the tab portion to form a buffer portion 421, so that the buffer portion 421 can be used to release stress, and stress concentration at the connection position of the tab portion 42 and the cell main body 41 is avoided, thereby protecting the tab portion 42.

As shown in fig. 3 and 4, the tab portion 42 is recessed from the surface of the battery case 10 pressed against the tab portion, so that the buffer portion 421 can be formed, the distance between the buffer portion 421 and the battery case 10 can be increased, and the insulation risk between the tab portion 42 and the battery case 10 can be reduced.

In one embodiment, the depth of the recess of the pole ear 42 is 0.2mm-8mm, which not only can form the buffer portion 421 with good buffer, but also can avoid the too large depth of the recess to make the size of the pole ear 42 connected with the pole post assembly smaller.

When the sunken degree of depth of utmost point ear 42 is less than 0.2mm, the buffering effect of buffer portion 421 of formation is relatively more weak, is unfavorable for realizing stress release, and when the sunken degree of depth of utmost point ear 42 is greater than 8mm, can make utmost point ear 42 pile up the size in electric core main part 41 one end and can be great to influence utmost point ear 42 and utmost point post subassembly's area of being connected.

The depth of depression of the tab portion 42 can be 0.2mm, 0.25mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 6.5mm, 7mm, 7.5mm, 7.8mm, 7.9mm, or 8mm, and so forth.

In one embodiment, as shown in fig. 2, the number of the tab portions 42 is two, the two tab portions 42 respectively extend from two opposite sides of the battery cell main body 41, the two tab portions 42 respectively are a positive tab portion and a negative tab portion, and the recessed depth of the positive tab portion is not greater than the recessed depth of the negative tab portion, so that it can be ensured that the positive tab portion can be reliably connected with the positive tab portion, and the buffering effect is not affected.

In one embodiment, the width of the recess of the tab portion 42 is not greater than 5mm, so as to avoid the buffer portion 421 from being oversized to affect the length of the connection between the tab portion 42 and the pole assembly, thereby ensuring a reliable connection area between the tab portion 42 and the pole assembly.

It should be noted that the pole ear 42 can be directly connected to the pole assembly, or the pole ear 42 can be connected to the pole assembly via an adapter plate.

In one embodiment, as shown in fig. 3 to 5, the battery further includes an adaptor plate 50, the adaptor plate 50 is disposed on the battery case 10, the tab portion 42 is connected to the adaptor plate 50, and at least a portion of the tab portion 42 is located between the battery case 10 and the adaptor plate 50, so that the adaptor plate 50 can support the tab portion 42, and the tab portion 42 can be conveniently connected to the adaptor plate 50, further, the buffer portion 421 can also form effective buffer, and the problem of stress concentration is avoided.

The pole ear 42 may be pulled in the process of connecting the pole ear 42 and the adapter plate 50, and at this time, the existence of the buffer portion 421 can effectively avoid the pole ear 42 from being pulled apart, so that the connection strength of the pole ear 42 is ensured.

As shown in fig. 5, the adaptor sheet 50 may be located below the tab portion 42, and on the basis that the adaptor sheet 50 is connected to the tab portion 42, the adaptor sheet 50 may realize reliable support of the tab portion 42, and due to the existence of the buffer portion 421, even if the battery case 10 presses the tab portion 42, stress concentration does not occur at the connection portion between the tab portion 42 and the battery cell main body 41, so as to avoid tearing of the tab portion 42, and the tab portion 42 substantially forms a recess by bending, so as to form a buffer space.

The adapter plate 50 is a metal sheet, and on the basis that the adapter plate 50 is electrically connected with the pole ear part 42, the adapter plate 50 has certain structural strength, so that the pole ear part 42 is reliably supported.

In one embodiment, as shown in fig. 4, the buffering portion 421 is located on one side of the adaptor sheet 50 close to the battery cell main body 41, so that the buffering portion 421 and the adaptor sheet 50 are arranged at an interval, and thus in the process of connecting the tab portion 42 and the adaptor sheet 50, the buffering portion 421 may also form a buffer to prevent the tab portion 42 from being snapped.

In one embodiment, as shown in fig. 3, the battery further includes a bracket 30, the bracket 30 is disposed in the battery casing 10 and located between the battery casing 10 and the cell main body 41, so that the lug portions 42 are located between the bracket 30 and the cell main body 41; the adapter sheet 50 is located between the bracket 30 and the battery cell main body 41, so that the adapter sheet 50 can be conveniently connected with the pole ear part 42.

The bracket 30 is located between the battery casing 10 and the battery cell main body 41, so as to realize the limit fixation of the battery cell 40, and the lug part 42 on the battery cell main body 41 can be constrained in the bracket 30, and

it should be noted that the battery case 10 and the tab portion 42 are insulated from each other, so as to avoid electrical connection between the battery cell 40 and the battery case. The battery case 10 and the tab portion 42 may be insulated by an insulating coating, or the battery case 10 and the tab portion 42 may be insulated by the support 30, and at this time, the battery case 10 may press the tab portion 42 by the support 30.

In an embodiment, the guide portion 31 is disposed on one side of the support 30 facing the cell main body 41, and one side of the tab portion 42 away from the cell main body 41 is lapped on the guide portion 31, so as to effectively support the tab portion 42, improve the connection stability of the tab portion 42, and avoid a great amount of suspension problems of the tab portion 42, thereby improving the safety performance of the battery.

In one embodiment, the side of the bracket 30 facing the cell main body 41 is provided with a guide portion 31, and the battery case 10 may be provided with a liquid injection hole 13, and the liquid injection hole 13 is disposed opposite to the guide portion 31, so that the guide portion 31 serves as a guide structure for the electrolyte, at this time, the tab portion 42 may contact with the guide portion 31, or the tab portion 42 may be disposed at a distance from the guide portion 31.

In one embodiment, as shown in fig. 3, the guide portion 31 includes a supporting surface 311, and at least a portion of the supporting surface 311 is disposed obliquely toward a direction away from the tab portion 42, so that the tab portion 42 can obliquely overlap the guide portion 31, and the tab portion 42 is not pressed, thereby avoiding the problem that the tab portion 42 is wrinkled and the like, and affecting the structural strength of the tab portion 42. Further, at least a part of the supporting surface 311 is inclined toward a direction away from the tab portion 42, so that the guide portion 31 can be prevented from interfering with the tab portion 42, thereby preventing the tab portion 42 from being damaged, and improving the safety performance of the battery.

It should be noted that, when the bracket 30 is installed, the pole ear 42 can be restrained by the guide portion 31, that is, the longer part of the pole ear 42 is accommodated inside the bracket 30, and the guide portion 31 can drive the pole ear 42 to be restrained and bent, so as to be overlapped on the guide portion 31, because the guide portion 31 includes the support surface 311, at least part of the support surface 311 is obliquely arranged towards the direction departing from the pole ear 42, so that the pole ear 42 can be conveniently restrained and bent, and the pole ear 42 can be reliably overlapped on the guide portion 31 under the self weight, so as to ensure the structural strength of the pole ear 42.

At least a part of the support surface 311 is inclined in a direction away from the lug part 42, that is, the support surface 311 is inclined downward with respect to the lug part 42, so that the lug part 42 can be reliably attached to the guide part 31 under its own weight.

In one embodiment, an included angle between at least a portion of the supporting surface 311 and a leading direction of the tab portion 42 from the cell main body 41 is 5 ° to 50 °, and on the basis of facilitating the tab portion 42 to overlap the supporting surface 311, it can also be avoided that the supporting force provided by the guide portion 31 to the tab portion 42 is small due to too large inclination of the supporting surface 311, thereby ensuring stability of the tab portion 42.

When the angle between at least a portion of the support surface 311 and the direction in which the tab portion 42 is drawn out from the cell main body 41 is less than 5 °, the guide portion 31 easily presses the tab portion 42, and the tab portion 42 is wrinkled, thereby causing a problem of strength reduction. And when the included angle between at least part of the supporting surface 311 and the leading-out direction of the tab part 42 from the battery cell main body 41 is greater than 50 degrees, the problem that the supporting force provided by the guide part 31 to the tab part 42 is small can be solved due to the overlarge inclination angle of the supporting surface 311, so that the problem that the structure of the tab part 42 is unstable can occur.

An included angle between at least a portion of the support surface 311 and a leading direction of the pole ear portion 42 from the cell main body 41 may be 5 °, 8 °,10 °, 15 °, 18 °, 20 °, 25 °, 28 °, 30 °, 35 °, 38 °,40 °, 45 °, 46 °, 48 °, 49 °, or 50 °, and so on.

In one embodiment, as shown in fig. 3, the supporting surface 311 includes a flat surface 3111 and a bevel surface 3112, the bevel surface 3112 is connected to a side of the flat surface 3111 facing the cell main body 41, and an included angle between the flat surface 3111 and the bevel surface 3112 is 5 ° to 50 °, so that the pole ear portion 42 can be conveniently lapped on the supporting surface 311 on the basis of ensuring the structural strength, and the stability of the pole ear portion 42 can be ensured.

The side of the guide 31 facing the tab portion 42 is a support surface 311, and the support surface 311 may be composed of a flat surface 3111 and a bevel surface 3112, and the bevel surface 3112 is located at the side close to the cell main body 41, so that the tab portion 42 can be lapped on the bevel surface 3112.

In one embodiment, the supporting surface 311 may be a plane, and the plane may be entirely inclined downward so as to form an angle with the leading direction of the tab 42 from the cell main body 41.

The direction of the tab 42 drawn out from the cell body 41 may be considered to be the direction in which the tab 42 extends after the individual tabs forming the tab 42 are flattened out, and may be considered to be the direction in which the tab 42 extends, and further, the direction in which the tab 42 extends may be parallel to the longitudinal direction of the battery case 10.

In one embodiment, as shown in fig. 3, the pole ear 42 covers at least a part of the adapter sheet 50, and the pole ear 42 is bent by one end of the adapter sheet 50 to overlap the guide portion 31, so that the end of the pole ear 42 can be prevented from contacting the battery case 10, and the guide portion 31 can also reliably support the pole ear 42.

The interposer 50 may be electrically connected to the tab 42, for example, the interposer 50 may be welded to the tab 42. Utmost point ear 42 cladding keysets 50 is at least partial, can guarantee utmost point ear 42 and keysets 50 connection stability to this guarantees that utmost point ear 42 and keysets 50 have reliable overcurrent ability, when carrying out the case to support 30, can make support drive utmost point ear 42 buckle by the one end of keysets 50, with the overlap joint on guide part 31, not only can avoid using other auxiliary fixtures, and it is comparatively convenient to operate, with this assembly efficiency who has improved the battery.

In one embodiment, as shown in fig. 3, the adaptor plate 50 is formed with a receiving space 51, and at least a portion of the guide portion 31 is located in the receiving space 51, so that the portion of the pole ear portion 42 bent from one end of the adaptor plate 50 can be easily overlapped on the guide portion 31, and the internal space of the battery case 10 can be reasonably utilized, thereby improving the energy density of the battery.

As shown in fig. 3, the interposer 50 may have a substantially U-shaped structure, so that a receiving space 51 is formed on a side of the interposer 50 away from the battery cell main body 41, that is, the receiving space 51 faces the bracket 30, so that at least a part of the guide portion 31 can be located in the receiving space 51, so that the receiving space 51 can be effectively utilized, the utilization rate of the internal space of the battery case 10 can be improved, and a part of the pole ear portion 42 overlapping the guide portion 31 does not form a large distance with the interposer 50.

In one embodiment, the end of the tab portion 42 away from the cell main body 41 is not disposed beyond the end of the guide portion 31 facing the cell main body 41, so that the free end of the tab portion 42 can be prevented from being too close to the cell main body 41, and the problem of too large length of the tab portion 42 can also be avoided.

In some embodiments, the end of the non-discharge pole ear portion 42 away from the cell main body 41 is disposed toward the end of the cell main body 41 beyond the guide portion 31.

In one embodiment, the support 30 is an insulating support, so that the insulating arrangement between the battery case 10 and the tab part 42 can be effectively realized, and the safety performance of the battery can be ensured. The support 30 may be a plastic structure, or the support 30 may be an elastomeric structure, which is not limited herein.

In one embodiment, the bracket 30 is an integrally formed structure, which not only is simple in forming, thereby improving the forming efficiency of the bracket 30, but also can ensure the structural stability of the bracket 30.

In one embodiment, as shown in fig. 3, the battery further includes an insulating member 60, the insulating member 60 is disposed in the battery case 10, and the bracket 30 is engaged with the insulating member 60; the support 30 is clamped to the insulating member 60 along the leading-out direction parallel to the tab portion 42, so that the operation is simple, and the guide portion 31 can be used for bundling the tab portion 42 in the process of clamping the support 30 to the insulating member 60, thereby improving the assembly efficiency of the battery.

Support 30 and insulator 60 joint, support 30 and insulator 60 can be through joint structure looks joint, for example, be provided with the arch on the support 30, and be provided with the recess on the insulator 60, arch and recess joint, perhaps, be provided with the recess on the support 30, and be provided with the arch on the insulator 60, arch and recess joint, perhaps, be provided with first trip on the support 30, be provided with the second trip on the insulator 60, first trip and second trip joint.

As shown in fig. 3, the interposer 50 may be disposed on the insulating member 60, so as to ensure the insulating arrangement between the interposer 50 and the battery case 10.

In one embodiment, as shown in fig. 1 to fig. 3, the battery further includes a pole assembly 20, the pole assembly 20 is disposed in the battery housing 10, the pole assembly 20 is disposed through the insulating member 60 to be electrically connected to the pole ear 42, so that the pole assembly 20 can be used as an electrode leading-out terminal of the battery to realize charging and discharging of the battery, the insulating member 60 can ensure reliable insulation between the pole assembly 20 and the battery housing 10, and support and fix the pole assembly 20.

The pole assembly 20 is connected to the pole ear 42 via an adapter plate 50, and the pole assembly 20 and the adapter plate 50 can be welded or riveted.

The battery cell 40 includes a battery cell main body 41 and a tab portion 42, and the tab portion 42 extends from the length direction of the battery cell main body 41; the tab 42 is connected to the terminal assembly 20, and the terminal assembly 20 can be disposed at the end of the battery case 10, so that the connection is facilitated and the length and space of the battery can be fully utilized. The tab portion 42 and the post assembly 20 may be directly connected, that is, the tab portion 42 and the post assembly 20 may be directly welded, or the tab portion 42 and the post assembly 20 may be connected through a metal patch, and the specific connection mode may be welding, or does not exclude the use of riveting, and the like, which is not limited herein.

The battery cell main body 41 includes more than two pole pieces, the tab portion 42 includes more than two single tabs, the single tabs extend from the corresponding pole pieces respectively, the width of the single tabs is smaller than that of the pole pieces, a plurality of single tabs are stacked to form the tab portion 42 and connected with the pole assembly 20, and the tab portion 42 can be welded with the pole assembly 20. Wherein the single tab is made of a metal foil having good electrical and thermal conductivity, such as aluminum, copper, nickel, or the like.

The pole assemblies 20 are two, the two pole assemblies 20 are respectively a positive pole assembly and a negative pole assembly, each pole assembly 20 can comprise two poles and is used for increasing the overcurrent capacity of the battery, the pole lug parts 42 are also two, the two pole lug parts 42 are respectively a positive pole lug and a negative pole lug, the positive pole assembly is connected with the positive pole lug, and the negative pole assembly is connected with the negative pole lug.

In one embodiment, as shown in fig. 1, a recess 14 is provided on the battery case 10, and the bracket 30 is disposed opposite to the recess 14; the concave 14 is used for accommodating the pole assembly of another battery, so that when the batteries are grouped, the maximum utilization of the space between two adjacent batteries can be realized, and the space utilization rate of the battery pack is improved.

In one embodiment, the recess 14 is disposed opposite to the tab portion 42, such that the bottom of the recess 14 presses against the tab portion 42, and therefore the battery case 10 presses against the tab portion 42 during the mounting process, and therefore the buffering portion 421 is disposed on the tab portion 42 for buffering.

In one embodiment, as shown in fig. 1, the battery housing 10 includes two opposite first surfaces 11 and four second surfaces 12 surrounding the first surfaces 11, the area of the first surfaces 11 is larger than that of the second surfaces 12, and the pole assembly 20 is disposed on the first surfaces 11, so as to ensure that the pole assembly 20 has a reliable supporting surface, thereby ensuring the stability of the pole assembly.

It should be noted that the battery is a prismatic battery, that is, the battery is a prismatic battery, the prismatic battery mainly refers to a prismatic shape, but does not strictly limit whether each side of the prism is necessarily a straight line in a strict sense, a corner between the sides is not necessarily a right angle, and may be a circular arc transition, two opposite first surfaces 11 are large surfaces of the battery case 10, and four second surfaces 12 are small surfaces of the battery case 10, the four second surfaces 12 include two pairs of small surfaces, that is, a first pair of small surfaces extending along the length direction of the battery case 10, and a second pair of small surfaces extending along the width direction of the battery case 10, and the area of the first pair of small surfaces is larger than that of the second pair of small surfaces, but is smaller than that of the large surfaces.

In one embodiment, as shown in fig. 3, the battery case 10 includes: a first housing piece 15; a second housing part 16, the second housing part 16 being connected to the first housing part 15; the first casing member 15 is a flat plate, and the liquid injection hole 13 is formed in the first casing member 15, so that the liquid injection hole 13 can be conveniently formed, and the manufacturing efficiency of the battery can be improved.

In one embodiment, the battery case 10 may be made of stainless steel or aluminum, and has good corrosion resistance and sufficient strength.

It should be noted that the first housing member 15 and the second housing member 16 may be provided independently, as shown in fig. 2. In some embodiments, it is not excluded that the first housing piece 15 and the second housing piece 16 may be a unitary structure, with the space for accommodating the cell 40 being formed by stamping and subsequently being closed by welding.

In one embodiment, the thickness of the battery case 10 is 0.1mm to 0.5mm, so that the weight of the battery case 10 can be reduced, thereby increasing the energy density of the battery. The first and

second housing pieces

15, 16 have a thickness of 0.1mm to 0.5mm.

The thickness of the battery case 10 may be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm, etc.

In one embodiment, the length of the cell is L,400mm L2500 mm, the width of the cell is K, the height of the cell is H,2K 50K, and/or 0.5H 20H.

Furthermore, K is more than or equal to 50mm and less than or equal to 200mm, and H is more than or equal to 10mm and less than or equal to 100mm.

Preferably, 4 K.ltoreq.L.ltoreq.25K, and/or 2 H.ltoreq.K.ltoreq.10H.

In the battery in the above embodiment, the ratio of the length to the width of the battery is large, and further, the ratio of the width to the height of the battery is large, while sufficient energy density is ensured.

In one embodiment, the length of the battery is L, the width of the battery is K, L is more than or equal to 4K and less than or equal to 7K, namely, the ratio of the length to the width of the battery in the embodiment is larger, so that the energy density of the battery is increased, and the subsequent formation of the battery pack is facilitated.

In one embodiment, the height of the battery is H, K is more than or equal to 3H and less than or equal to 7H, and the ratio of the width to the height of the battery is larger, so that the battery is convenient to form under the condition of ensuring enough energy density.

Alternatively, the length of the cell may be 500mm to 1500mm, the width of the cell may be 80mm to 150mm, and the height of the cell may be 15mm to 35mm.

The length of the battery is a dimension in the battery length direction, the width of the battery is a dimension in the battery width direction, and the height of the battery is a dimension in the battery height direction, that is, the thickness of the battery.

In one embodiment, the batteries are laminated batteries, so that the batteries are convenient to pack and can be processed to obtain batteries with longer lengths.

The battery includes a cell and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The cell refers to a unit formed by winding or laminating a stacking part, wherein the stacking part comprises a first pole piece, a partition and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. And the polarities of the first pole piece and the second pole piece can be interchanged.

Specifically, electric core is lamination formula electric core, and electric core has first pole piece that stacks up each other, with first pole piece opposite electric property's second pole piece and the diaphragm of setting between first pole piece and second pole piece to make many to pile up and form lamination formula electric core to first pole piece and second pole piece.

Optionally, the battery may be a wound battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery core.

An embodiment of the utility model also provides a group battery, and the group battery includes above-mentioned battery.

The battery of the battery pack of an embodiment of the present invention includes a battery case 10 and an electric core 40, and the electric core 40 is disposed in the battery case 10. Battery 40 includes electric core main part 41 and utmost point ear 42, is formed with buffer 421 through the one side that is connected at utmost point ear 42 and electric core main part 41 to in the battery assembling process, battery case 10 supports and presses utmost point ear 42 and also can not make utmost point ear 42 and electric core main part 41 junction stress concentration appear, and buffer 421 can realize the release to stress promptly, thereby avoids utmost point ear 42 to tear, with this security performance who improves the group battery.

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 module may further include an end plate and a side plate for fixing the plurality of batteries.

It should be noted that a plurality of batteries can be arranged in the battery box after forming the battery module, and the plurality of batteries can be fixed through the end plate and the side plate. A plurality of batteries can directly set up in the battery box, need not to pack a plurality of batteries promptly, and at this moment, can get rid of end plate and curb plate.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention 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, comprising:

a battery case (10);

the battery cell (40) is arranged in the battery shell (10), the battery cell (40) comprises a cell main body (41) and a tab part (42), the tab part (42) extends out from one side of the cell main body (41), and a buffer part (421) is formed on one side, connected with the cell main body (41), of the tab part (42);

wherein the battery case (10) is arranged to press against the tab portion (42).

2. The battery according to claim 1, characterized in that the tab portion (42) is recessed from a direction away from the surface of the battery case (10) pressed against it to form the buffer portion (421).

3. The battery of claim 2, wherein the ear portions (42) are recessed to a depth of 0.2mm to 8mm.

4. The battery of claim 3, wherein the number of the pole ear portions (42) is two, the two pole ear portions (42) respectively extend from two opposite sides of the cell main body (41), the two pole ear portions (42) respectively are a positive pole ear portion and a negative pole ear portion, and the depth of the depression of the positive pole ear portion is not greater than the depth of the depression of the negative pole ear portion.

5. The battery of claim 2, wherein the width of the lug portion (42) depression is no greater than 5mm.

6. The battery of claim 1, further comprising an interposer (50), wherein the interposer (50) is disposed in the battery housing (10), and wherein the tab portion (42) is coupled to the interposer (50), wherein at least a portion of the tab portion (42) is disposed between the battery housing (10) and the interposer (50).

7. The battery according to claim 6, wherein the buffer part (421) is located on one side of the adaptor sheet (50) close to the cell main body (41), so that the buffer part (421) is spaced from the adaptor sheet (50).

8. The battery according to any one of claims 1 to 7, characterized in that a recess (14) is provided on the battery case (10), the recess (14) being disposed opposite the tab portion (42) such that a bottom of the recess (14) is pressed against the tab portion (42);

wherein the recess (14) is adapted to receive a pole assembly of another battery.

9. The battery according to any one of claims 1 to 7, characterized in that an insulation is provided between the battery case (10) and the tab portion (42).

10. The battery according to any one of claims 1 to 7, wherein the thickness of the battery case (10) is 0.1mm-0.5mm.