CN218160745U - Battery and battery pack - Google Patents

Abstract

The utility model relates to a battery technology field provides a battery and group battery. The battery includes: the battery shell comprises two opposite first surfaces and four second surfaces arranged around the first surfaces, and the first surfaces comprise a first central line and a second central line which are perpendicular to each other; the first pole post assembly is arranged on the battery shell, and a first positioning part is arranged on the first pole post assembly; the second pole column assembly is arranged on the battery shell, and a second positioning part is arranged on the second pole column assembly; wherein, first utmost point post subassembly and second utmost point post subassembly set up in the relative both ends of same first surface along the extending direction of first central line, and first location portion and second location portion set up about the second central line symmetry to can be when the battery is in groups, can establish ties or parallelly connected sign as the battery through first location portion and second location portion, with this problem of avoiding appearing the malassembly, thereby improve the efficiency in groups of battery.

Description

Battery and battery pack

Technical Field

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

Background

When the battery is in groups, the utmost point post and the busbar of battery are connected, in order to guarantee series connection or parallelly connected between the battery, need confirm the polarity of utmost point post, and a plurality ofly distinguish through the colour of correlation structure among the correlation technique, but the effect is not very good, the problem of misassembly appears easily.

SUMMERY OF THE UTILITY MODEL

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

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

the battery shell comprises two opposite first surfaces and four second surfaces arranged around the first surfaces, and the first surfaces comprise a first central line and a second central line which are perpendicular to each other;

the first pole post assembly is arranged on the battery shell, and a first positioning part is arranged on the first pole post assembly;

the second pole column assembly is arranged on the battery shell, and a second positioning part is arranged on the second pole column assembly;

the first pole column assembly and the second pole column assembly are arranged at two opposite ends of the same first surface along the extending direction of the first central line, and the first positioning portion and the second positioning portion are symmetrically arranged relative to the second central line.

The utility model discloses battery includes battery housing, first utmost point post subassembly and second utmost point post subassembly, and first utmost point post subassembly and second utmost point post subassembly set up on battery housing. Set up in the relative both ends of same first surface through the extending direction with first utmost point post subassembly and second utmost point post subassembly along first central line to first location portion on the first utmost point post subassembly and the second location portion on the second utmost point post subassembly set up about second central line symmetry, thereby can be when the battery is in groups, can establish ties or parallelly connected sign as the battery through first location portion and second location portion, with this problem of avoiding appearing the erroneous assembly, thereby improve the efficiency in groups of battery.

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

The utility model discloses a group battery of embodiment includes the battery, and the battery includes battery housing, first utmost point post subassembly and second utmost point post subassembly, and first utmost point post subassembly and second utmost point post subassembly set up on battery housing. Set up in the relative both ends of same first surface through the extending direction with first utmost point post subassembly and second utmost point post subassembly along first central line to first location portion on the first utmost point post subassembly and the second location portion on the second utmost point post subassembly set up about second central line symmetry, thereby can be when the battery is in groups, can establish ties or parallelly connected sign as the battery through first location portion and second location portion, with this problem of avoiding appearing the erroneous assembly, thereby improve the efficiency in groups of battery.

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 diagram illustrating one perspective of a battery according to an exemplary embodiment;

FIG. 2 is a schematic diagram illustrating another perspective of a battery according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating a partial structure of a battery according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a partial structure of a battery pack according to an exemplary embodiment;

FIG. 5 is a schematic illustration of a partial structure of a battery pack according to an exemplary embodiment;

fig. 6 is a schematic diagram illustrating a structure of a bus bar of a battery pack according to an exemplary embodiment.

The reference numerals are explained below:

10. a battery case; 11. a first surface; 12. a second surface; 13. recessing; 20. a first pole assembly; 21. a first positioning portion; 22. a first connecting surface; 30. a second pole post assembly; 31. a second positioning portion; 32. a second connecting surface; 40. a bus bar; 41. and positioning the matching part.

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 as a specific case by a person skilled in the art.

Further, in the description of the present disclosure, it should 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 fig. 6, the battery includes: the battery shell 10, the battery shell 10 includes two opposite first surfaces 11 and four second surfaces 12 arranged around the first surfaces 11, the first surfaces 11 include a first central line and a second central line which are perpendicular to each other; the first pole assembly 20, the first pole assembly 20 is arranged on the battery shell 10, and the first positioning part 21 is arranged on the first pole assembly 20; a second pole assembly 30, wherein the second pole assembly 30 is arranged on the battery shell 10, and a second positioning part 31 is arranged on the second pole assembly 30; the first pole post assembly 20 and the second pole post assembly 30 are disposed at two opposite ends of the same first surface 11 along an extending direction of the first center line, and the first positioning portion 21 and the second positioning portion 31 are symmetrically disposed about the second center line.

The utility model discloses a battery of an embodiment includes battery housing 10, first utmost point post subassembly 20 and second utmost point post subassembly 30, and first utmost point post subassembly 20 and second utmost point post subassembly 30 set up on battery housing 10. The first pole post assembly 20 and the second pole post assembly 30 are arranged at two opposite ends of the same first surface 11 along the extending direction of the first central line, and the first positioning part 21 on the first pole post assembly 20 and the second positioning part 31 on the second pole post assembly 30 are symmetrically arranged about the second central line, so that when batteries are grouped, the batteries can be used as serial or parallel identifications of the batteries through the first positioning part 21 and the second positioning part 31, the problem of mis-assembly is avoided, and the grouping efficiency of the batteries is improved.

It should be noted that, referring to fig. 2, the first surface 11 includes a first center line a and a second center line B perpendicular to each other, the first pole assembly 20 and the second pole assembly 30 are disposed at two opposite ends of the same first surface 11 along an extending direction of the first center line a, and the first positioning portion 21 and the second positioning portion 31 are symmetrically disposed about the second center line B. When the batteries are grouped, two adjacent batteries can be connected through the busbar, for example, when two adjacent batteries are connected in series, the first pole assembly 20 of one battery can be connected with the second pole assembly 30 of another battery through the busbar, at this moment, the first positioning portion 21 and the second positioning portion 31 of two adjacent batteries are diagonally distributed, that is, when two batteries are connected in series, as long as the first positioning portion 21 and the second positioning portion 31 of two adjacent batteries are diagonally distributed, not only can the misconnection be avoided, but also the connection efficiency can be improved. Or, when two adjacent batteries are combined, the first pole post assembly 20 of one battery may be connected to the first pole post assembly 20 of another battery through the bus bar, at this time, the first positioning portion 21 and the first positioning portion 21 of two adjacent batteries may be on the same horizontal plane or vertical plane, that is, when the two batteries are combined, as long as the first positioning portion 21 and the first positioning portion 21 of two adjacent batteries are ensured to be on the same horizontal plane or vertical plane, not only the occurrence of the misconnection can be avoided, but also the efficiency of the connection can be improved.

In one embodiment, the area of the first surface 11 is larger than the area of the second surface 12, and the first pole assembly 20 and the second pole assembly 30 are disposed on the same first surface 11, so as to ensure that the first pole assembly 20 and the second pole assembly 30 have a reliable supporting surface, thereby ensuring the stability of the first pole assembly 20 and the second pole assembly 30.

It should be noted that the battery case 10 is a square battery case, the two opposite first surfaces 11 are large surfaces of the battery case 10, the four second surfaces 12 are small surfaces of the battery case 10, the four second surfaces 12 include two pairs of small surfaces, namely 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 areas of the first pair of small surfaces are larger than the areas of the second pair of small surfaces, but are smaller than the areas of the large surfaces. The battery is a square battery, namely the battery is a quadrangular prism battery, the quadrangular prism battery mainly refers to a shape of a prism, but whether each edge of the prism is a strict straight line or not is not strictly limited, and corners among the edges are not necessarily right angles and can be in arc transition.

In one embodiment, as shown in fig. 2, the first pole assembly 20 and the second pole assembly 30 both intersect the first centerline a, i.e. the first pole assembly 20 and the second pole assembly 30 can be disposed on the first centerline a instead of being disposed offset from the first pole assembly 20 and the second pole assembly 30, thereby improving the supporting effect of the first surface 11 on the first pole assembly 20 and the second pole assembly 30 to ensure the structural stability.

As shown in fig. 2, the extending direction of the first center line a is parallel to the length direction of the first surface 11, and the first center line a intersects with both the first pole assembly 20 and the second pole assembly 30, further, the first center line a may intersect with the middle position of the first pole assembly 20 and the second pole assembly 30, so that the gravity center of the first pole assembly 20 and the second pole assembly 30 may be prevented from deviating too much from the first center line a, thereby ensuring the supporting effect of the first surface 11 on the first pole assembly 20 and the second pole assembly 30.

In one embodiment, the first pole assembly 20 and the second pole assembly 30 are symmetrically disposed about the second center line B, which not only is the structural arrangement reasonable, but also ensures that the first pole assembly 20 and the second pole assembly 30 can apply a uniform force to the battery case 10, thereby ensuring the structural stability of the battery.

In one embodiment, the first positioning portion 21 is disposed near an end of the first pole assembly 20, the second positioning portion 31 is disposed near an end of the second pole assembly 30, on the basis of ensuring that the first positioning portion 21 on the first pole assembly 20 and the second positioning portion 31 on the second pole assembly 30 are symmetrically disposed about the second central line, when the disposing positions of the first positioning portion 21 and the second positioning portion 31 do not affect the grouping of the batteries, the busbar is connected to the first pole assembly 20 and the second pole assembly 30, that is, the first positioning portion 21 and the second positioning portion 31 may realize avoidance of the busbar, and the space of the first pole assembly 20 and the space of the second pole assembly 30 may be fully utilized, so as to improve the space utilization rate of the batteries.

The first positioning portion 21 is disposed near the end of the first pole assembly 20, that is, the first positioning portion 21 may be disposed near the circumferential outer surface of the first pole assembly 20, and the distance between the first positioning portion 21 and the circumferential outer surface of the adjacent first pole assembly 20 is relatively small, for example, the first positioning portion 21 may be a groove, and the groove is disposed near the end of the first pole assembly 20. Accordingly, the second positioning portion 31 is disposed near the end of the second pole assembly 30, the second positioning portion 31 may be disposed near the circumferential outer surface of the second pole assembly 30, and the distance between the second positioning portion 31 and the circumferential outer surface of the second pole assembly 30 adjacent thereto is relatively small. Further, in the width direction of the battery case 10, the first positioning portion 21 may be disposed near the end of the first pole assembly 20, and the second positioning portion 31 may be disposed near the end of the second pole assembly 30, for example, the second positioning portion 31 may be a protrusion disposed near the end of the first pole assembly 20.

In one embodiment, the first positioning portion 21 and the second positioning portion 31 are both grooves, or the first positioning portion 21 and the second positioning portion 31 are both protrusions. The first positioning portion 21 and the second positioning portion 31 are simple in structure, not only convenient to form, but also easy to form a connection with a busbar, thereby facilitating the subsequent grouping of the batteries.

The first positioning portion 21 and the second positioning portion 31 are both grooves, which may be circular grooves, square grooves, triangular grooves, or the like, and the first positioning portion 21 and the second positioning portion 31 are both protrusions, which may be cylindrical protrusions, rectangular protrusions, triangular protrusions, or the like.

In one embodiment, the first positioning portion 21 and the second positioning portion 31 are both convex, and the height of the convex is 1mm to 10mm, which not only can satisfy the identification function, i.e. convenient identification, but also does not occupy too much space, and avoids the problem of adding too much weight.

The height of the protrusions may be 1mm, 1.1mm, 1.5mm, 2mm, 2.1mm, 2.5mm, 3mm, 3.5mm, 3.8mm, 4mm, 4.1mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 9.8mm, 10mm, or the like.

In one embodiment, the first positioning portion 21 and the second positioning portion 31 are both grooves, and the depth of each groove is 1mm-10mm, so that the structural strength of the pole assembly is prevented from being affected due to the fact that the depth of each groove is too large on the basis of convenient identification.

The depth of the grooves may be 1mm, 1.1mm, 1.5mm, 2mm, 2.1mm, 2.5mm, 3mm, 3.5mm, 3.8mm, 4mm, 4.1mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 9.8mm, 10mm, or the like.

In one embodiment, the battery further includes a battery cell, and the first pole assembly 20 and the second pole assembly 30 may be respectively connected to two tabs of the battery cell. The first and second pole assemblies 20, 30 may be positive and negative pole assemblies, respectively.

In one embodiment, the length of the cell is a,400mm a 2500mm, the width of the cell is b, the height of the cell is c,2b a 50b, and/or 0.5c b 20c.

Further, b is more than or equal to 50mm and less than or equal to 200mm, and c is more than or equal to 10mm and less than or equal to 100mm.

Preferably, 4 b.ltoreq.a.ltoreq.25 b, and/or 2 c.ltoreq.b.ltoreq.10 c.

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 a, the width of the battery is b, and a is more than or equal to 4b and less than or equal to 7b, i.e. 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 c, b is more than or equal to 3c and less than or equal to 7c, and the ratio of the width to the height of the battery is larger, so that the battery is conveniently formed under the condition of ensuring enough energy density.

Alternatively, the length of the cell may be 500mm-1500mm, the width of the cell may be 80mm-150mm, and the height of the cell may be 15mm-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, which are convenient to pack and can be processed to obtain batteries with longer length.

The battery includes a cell and an electrolyte, and is 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 winding battery, that is, a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm piece disposed between the first pole piece and the second pole piece are wound to obtain a winding battery cell.

In one embodiment, as shown in fig. 1, the battery housing 10 is provided with a recess 13, and the recess 13 can be used for accommodating a pole assembly of another battery, for example, a first pole assembly 20 or a second pole assembly 30 of another battery, so as to reduce an excessive installation volume occupied by the pole assembly. The battery housing 10 may be provided with two recesses 13, and the two recesses 13 respectively receive the first pole assembly 20 and the second pole assembly 30 of another battery.

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

An embodiment of the present invention further provides a battery pack, please refer to fig. 1 to 5, wherein the battery pack includes the above battery.

The utility model discloses the group battery of an embodiment includes the battery, and the battery includes battery housing 10, first utmost point post subassembly 20 and second utmost point post subassembly 30, and first utmost point post subassembly 20 and second utmost point post subassembly 30 set up on battery housing 10. Set up in the relative both ends of same first surface 11 through the extending direction with first utmost point post subassembly 20 and second utmost point post subassembly 30 along first central line to first location portion 21 on the first utmost point post subassembly 20 and the second location portion 31 on the second utmost point post subassembly 30 set up about the second central line symmetry, thereby can be when the battery is in groups, can regard as the sign that the battery is established ties or is parallelly connected through first location portion 21 and second location portion 31, with this problem of avoiding appearing the erroneous assembly, thereby improve the battery and become group's efficiency.

In one embodiment, as shown in fig. 4 and 5, the battery pack further includes a bus bar 40, and the bus bar 40 connects at least two batteries, so that the bus bar 40 can connect the batteries in series or in parallel.

The bus bar 40 can connect two adjacent batteries, one end of the bus bar 40 can be connected with the first pole assembly 20 of one battery, and the other end of the bus bar 40 can be connected with the second pole assembly 30 of another battery, so that the serial connection of the two batteries is realized through the bus bar 40, or one end of the bus bar 40 can be connected with the first pole assembly 20 of one battery, and the other end of the bus bar 40 can be connected with the first pole assembly 20 of another battery, so that the parallel connection of the two batteries is realized through the bus bar 40.

In one embodiment, as shown in fig. 5 and 6, the bus bar 40 is provided with a positioning fitting part 41, and the positioning fitting part 41 is connected with the first positioning part 21 or the second positioning part 31 of one cell, so that the assembly efficiency of the bus bar 40 can be improved, that is, the bus bar 40 can be quickly positioned by connecting the positioning fitting part 41 with the first positioning part 21 or the second positioning part 31 of one cell, so that the grouping efficiency of the battery pack can be improved, and the connection stability of the bus bar 40 and the pole assembly can be ensured.

It should be noted that, when the bus bar 40 is installed, the positioning fitting portion 41 of the bus bar 40 may be connected to the first positioning portion 21 or the second positioning portion 31 of the battery, that is, the bus bar 40 is quickly positioned, and then the bus bar 40 may be connected to the pole assembly by welding.

In one embodiment, two adjacent batteries are connected in series, that is, when two adjacent batteries are grouped, the first positioning portion 21 and the second positioning portion 31 of two adjacent batteries are diagonally distributed, so that the bus bar 40 is connected with the first pole assembly 20 and the second pole assembly 30, and then the series connection of the two adjacent batteries is completed.

In one embodiment, as shown in fig. 5 and fig. 6, at least two positioning and matching parts 41 are provided on the bus bar 40, and the first positioning part 21 of one of the two adjacent batteries and the second positioning part 31 of the other battery are diagonally arranged to connect the two positioning and matching parts 41 respectively, that is, the two positioning and matching parts 41 of the bus bar 40 are in positioning connection with the first positioning part 21 and the second positioning part 31 of the two batteries respectively, so as to realize rapid positioning of the bus bar 40, and then the bus bar 40 can be connected with the first pole assembly 20 and the second pole assembly 30 by welding.

As shown in fig. 6, the two positioning matching parts 41 may be through holes, and in this case, the first positioning part 21 and the second positioning part 31 may be protrusions, so that the protrusions and the through holes are matched. Alternatively, the two positioning fitting portions 41 may be projections, and the first positioning portion 21 and the second positioning portion 31 may be grooves. The structural forms of the positioning fit portion 41, the first positioning portion 21, and the second positioning portion 31 may not be limited.

The positioning matching part 41 may be a circular hole, and the first positioning part 21 and the second positioning part 31 may be positioning pillars, or the positioning matching part 41 may be a waist-shaped hole, and the first positioning part 21 and the second positioning part 31 may be positioning pillars.

In one embodiment, as shown in fig. 3, the first pole assembly 20 includes a first connection surface 22, the first connection surface 22 being substantially perpendicular to the first surface 11, the second pole assembly 30 includes a second connection surface 32, the second connection surface 32 being substantially perpendicular to the first surface 11; wherein, the first connecting surface 22 or the second connecting surface 32 welding of busbar 40 and a battery can improve busbar 40 and first pole subassembly 20 and second pole subassembly 30 and be connected stability on the basis that makes things convenient for busbar 40 to be connected with first pole subassembly 20 and second pole subassembly 30.

The first connecting surface 22 is substantially perpendicular to the first surface 11 and the second connecting surface 32 is substantially perpendicular to the first surface 11, such that the connection of the bus bar 40 to the first pole assembly 20 and the second pole assembly 30 may be facilitated, i.e., the bus bar 40 may be directly butted against the first connecting surface 22 and the second connecting surface 32.

It should be noted that the first connecting surface 22 is substantially perpendicular to the first surface 11, and the second connecting surface 32 is substantially perpendicular to the first surface 11, where the emphasis is on the first connecting surface 22 being perpendicular to the first surface 11 and the second connecting surface 32 being perpendicular to the first surface 11 when the mounting error is not considered.

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 disclosure is limited only by the appended claims.

Claims (12)

1. A battery, comprising:

a battery case (10), said battery case (10) comprising two opposing first surfaces (11) and four second surfaces (12) disposed around said first surfaces (11), said first surfaces (11) comprising a first centerline and a second centerline perpendicular to each other;

a first pole assembly (20), wherein the first pole assembly (20) is arranged on the battery shell (10), and a first positioning part (21) is arranged on the first pole assembly (20);

a second pole assembly (30), wherein the second pole assembly (30) is arranged on the battery shell (10), and a second positioning part (31) is arranged on the second pole assembly (30);

wherein the first pole post assembly (20) and the second pole post assembly (30) are arranged at two opposite ends of the same first surface (11) along the extending direction of the first central line, and the first positioning part (21) and the second positioning part (31) are symmetrically arranged around the second central line.

2. The battery of claim 1, wherein the first pole assembly (20) and the second pole assembly (30) each intersect the first centerline.

3. The battery of claim 1, wherein the first pole assembly (20) and the second pole assembly (30) are symmetrically disposed about the second centerline.

4. The battery according to claim 1, characterized in that the area of the first surface (11) is larger than the area of the second surface (12).

5. The battery according to claim 1, wherein the first positioning portion (21) is disposed near an end of the first pole assembly (20), and the second positioning portion (31) is disposed near an end of the second pole assembly (30).

6. The battery according to any one of claims 1 to 5, wherein the first positioning portion (21) and the second positioning portion (31) are both grooves, or the first positioning portion (21) and the second positioning portion (31) are both protrusions.

7. The cell defined in claim 6, wherein the height of the protrusions is from 1mm to 10mm, or the depth of the grooves is from 1mm to 10mm.

8. A battery pack characterized by comprising the battery according to any one of claims 1 to 7.

9. The battery according to claim 8, further comprising a buss bar (40), the buss bar (40) connecting at least two of the cells;

the bus bar (40) is provided with a positioning matching part (41), and the positioning matching part (41) is connected with the first positioning part (21) or the second positioning part (31) of one battery.

10. The battery according to claim 9, wherein adjacent two of said cells are connected in series.

11. The battery pack according to claim 10, wherein at least two of the positioning fit portions (41) are provided on the bus bar (40), and the first positioning portion (21) of one of the adjacent two cells is diagonally provided with the second positioning portion (31) of the other cell to connect the two positioning fit portions (41), respectively.

12. The battery according to any one of claims 9 to 11, characterized in that the first pole assembly (20) comprises a first connection surface (22), the first connection surface (22) being substantially perpendicular to the first surface (11), the second pole assembly (30) comprising a second connection surface (32), the second connection surface (32) being substantially perpendicular to the first surface (11);

wherein the busbar (40) is welded to the first connection surface (22) or the second connection surface (32) of one of the cells.

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