CN219779141U - Battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack, which comprises a plurality of single batteries, wherein the single batteries comprise: the battery comprises a battery shell, a first pole and a second pole, wherein the battery shell comprises two opposite first surfaces and four second surfaces; the first electrode post is arranged on the first surface and comprises a first main body part and a first converging part, the first converging part comprises a first conductive connecting surface, and a first included angle is formed between the first conductive connecting surface and the first surface; the second pole and the first pole are arranged on the same first surface, the second pole comprises a second main body part and a second converging part, the second converging part comprises a second conductive connecting surface, and a second included angle is formed between the second conductive connecting surface and the first surface; among the adjacent two single batteries, the first conductive connection surface of one single battery is opposite to the second conductive connection surface of the other single battery, so that the adjacent two single batteries are electrically connected, and the assembly efficiency of the battery pack is improved.

Description

Battery pack

Technical Field

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

Background

In the related art, the battery pack includes a plurality of unit cells, and the plurality of unit cells are generally electrically connected together through a bus bar, and a welding process is required when the plurality of unit cells are connected through the bus bar, so that assembly efficiency is low when the plurality of unit cells are grouped.

Disclosure of Invention

The utility model provides a battery pack, which improves the assembly efficiency of the battery pack.

The utility model provides a battery pack, which comprises a plurality of single batteries arranged along a first direction, wherein the single batteries comprise:

a battery housing including two opposing first surfaces and four second surfaces disposed around the first surfaces, the first surfaces having an area greater than an area of the second surfaces, the first direction being perpendicular to the first surfaces;

the first pole is arranged on the first surface, the first pole comprises a first main body part and a first converging part, at least part of the first main body part and the first converging part are of an integrated structure, the first converging part comprises a first conductive connecting surface, a first included angle is formed between the first conductive connecting surface and the first surface, and the first conductive connecting surface extends from one first surface provided with the first pole to a direction away from the other first surface;

the second pole and the first pole are arranged on the same first surface, the second pole comprises a second main body part and a second converging part, at least part of the second main body part and the second converging part are of an integrated structure, the second converging part comprises a second conductive connecting surface, a second included angle is formed between the second conductive connecting surface and the first surface, and the second conductive connecting surface extends from one first surface provided with the second pole to a direction close to the other first surface;

and the first conductive connecting surface of one single battery is opposite to the second conductive connecting surface of the other single battery in the adjacent two single batteries, so that the adjacent two single batteries are electrically connected.

According to the battery pack provided by the utility model, a plurality of single batteries are arranged along a first direction, a first conductive connection surface of a first pole of each single battery extends from one first surface provided with the first pole towards a direction away from the other first surface, a second conductive connection surface of a second pole extends from one first surface provided with the second pole towards a direction close to the other first surface, and in two adjacent single batteries, the first conductive connection surface of one single battery is opposite to the second conductive connection surface of the other single battery, so that the poles are in self-lap joint when the two adjacent single batteries are stacked, and a plurality of single batteries are connected in series along the first direction; the first conductive connecting surface and the second conductive connecting surface of the other single battery are connected in series by a self-lap joint mode, so that the welding process required by connecting the two adjacent single batteries in series is reduced, and the system internal resistance of the battery pack is reduced; meanwhile, the bus bars connected between the single batteries are also omitted, required accessories of the battery pack are reduced, production cost is reduced, and assembly efficiency of the battery pack 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 in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic view illustrating a structure of a battery pack according to an exemplary embodiment;

fig. 2 is a schematic view illustrating a structure of overlap between adjacent unit cells according to an exemplary embodiment;

fig. 3 is a schematic view illustrating a structure of overlap between adjacent unit cells according to an exemplary embodiment;

fig. 4 is a schematic structural view of a battery case according to an exemplary embodiment;

fig. 5 is a schematic structural view of a cell shown according to an exemplary embodiment;

fig. 6 is a schematic diagram illustrating a low voltage harness board disposed on a battery pack according to an exemplary embodiment.

The reference numerals are explained as follows:

1. a single battery;

10. a battery case; 11. a first surface; 111. an accommodating groove; 12. a second surface; 121. a first recess; 122. a second recess; 13. a liquid injection hole; 110. a first housing member; 120. a second housing member;

20. a first cell; 210. a first cell body; 220. a first positive electrode tab; 230. a first negative electrode tab;

30. a second cell; 310. a second cell body; 320. a second positive electrode tab; 330. a second negative electrode tab;

40. a first pole; 41. a first body portion; 42. a first converging portion; 421. a first conductive connection surface; 422. a first portion; 423. a second portion;

50. a second post; 51. a second body portion; 52. a second confluence portion; 521. a second conductive connection surface; 522. a third section; 523. a fourth section;

60. an insulating support; 61. avoiding the through hole; 62. a limit groove;

70. a low voltage harness board; 71. and a connecting end.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying 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, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

An embodiment of the present utility model provides a battery pack, as shown in fig. 1 to 5, the battery pack including a plurality of unit cells 1 arranged in a first direction Y, the unit cells 1 including: the battery case 10, the first pole 40 and the second pole 50, the battery case 10 includes two opposite first surfaces 11 and four second surfaces 12 disposed around the first surfaces 11, the first surfaces 11 have an area larger than that of the second surfaces 12, and the first direction Y is perpendicular to the first surfaces 11; the first pole 40 is disposed on the first surface 11, the first pole 40 includes a first main body portion 41 and a first bus portion 42, at least a portion of the first main body portion 41 and the first bus portion 42 are integrally formed, the first bus portion 42 includes a first conductive connection surface 421, a first included angle is formed between the first conductive connection surface 421 and the first surface 11, and the first conductive connection surface 421 extends from one first surface 11 on which the first pole 40 is disposed in a direction away from the other first surface 11; the second pole 50 and the first pole 40 are disposed on the same first surface 11, the second pole 50 includes a second main body portion 51 and a second bus portion 52, at least a portion of the second main body portion 51 and the second bus portion 52 are integrally formed, the second bus portion 52 includes a second conductive connection surface 521, a second included angle is formed between the second conductive connection surface 521 and the first surface 11, and the second conductive connection surface 521 extends from one first surface 11 on which the second pole 50 is disposed toward a direction approaching the other first surface 11.

Among the adjacent two unit cells 1, the first conductive connection surface 421 of one unit cell 1 is disposed opposite to the second conductive connection surface 521 of the other unit cell 1, so that the adjacent two unit cells 1 are electrically connected.

In the battery pack provided by the utility model, a plurality of single batteries 1 are arranged along a first direction Y, a first conductive connection surface 421 of a first electrode post 40 of each single battery 1 extends from one first surface 11 provided with the first electrode post 40 to a direction away from the other first surface 11, a second conductive connection surface 521 of a second electrode post 50 extends from one first surface 11 provided with the second electrode post 50 to a direction close to the other first surface 11, and in two adjacent single batteries 1, the first conductive connection surface 421 of one single battery 1 is opposite to the second conductive connection surface 521 of the other single battery 1, so that the electrode posts are self-overlapped when the two adjacent single batteries 1 are stacked, and the plurality of single batteries 1 are connected in series along the first direction Y; the first conductive connecting surface 421 and the second conductive connecting surface 521 of the other single battery 1 are connected in series by self-lap joint, so that the welding process required by connecting the two adjacent single batteries 1 in series is reduced, and the system internal resistance of the battery pack is reduced; meanwhile, the bus bars connected between the single batteries 1 are also omitted, required accessories of the battery pack are reduced, production cost is reduced, and assembly efficiency of the battery pack is improved.

As shown in fig. 1, the battery case 10 includes two opposite first surfaces 11 and four second surfaces 12 disposed around the first surfaces 11, the first surfaces 11 having an area larger than that of the second surfaces 12, and the first direction Y being perpendicular to the first surfaces 11; when stacking the plurality of unit cells 1 into a battery pack, the large surfaces of the maximum areas of the plurality of unit cells 1 are stacked together, i.e., the stacking direction of the plurality of unit cells 1 is perpendicular to the large surfaces of the unit cells 1. Through the stacking direction of a plurality of single batteries 1 perpendicular to the large surface of the single batteries 1, the space occupied by the stacked single batteries 1 is smaller, and therefore the energy density of the assembled single batteries can be relatively improved.

As shown in fig. 4, the battery case 10 includes a first case member 110 and a second case member 120, the first case member 110 is a cover plate, the second case member 120 is formed with a receiving space for receiving a battery cell, the first case member 110 forms a first surface 11, the second case member 120 forms a first surface 11 and four second surfaces 12 disposed around the first surface 11, and the first and second poles 40 and 50 are disposed on the first case member 110.

As shown in fig. 2 and 3, the first conductive connection surface 421 of one unit cell 1 is opposite to the second conductive connection surface 521 of the other unit cell 1 in the two adjacent unit cells 1, that is, the first post 40 of one unit cell and the second post 50 of the other unit cell are located on the same side of the cell housing 10, and the second post 50 of one unit cell and the first post 40 of the other unit cell are located on the same side of the cell housing 10, so that when the two adjacent unit cells 1 overlap, they can be connected in series.

The unit cell 1 includes an electric core and an electrolyte, and is capable of performing a minimum unit of electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating the stacked portion. The battery cell comprises a battery cell main body, a first tab and a second tab. The cell body has a first pole piece, a second pole piece, and a diaphragm disposed between the first pole piece and the second pole piece, stacked on each other, such that the pairs of the first pole piece and the second pole piece are stacked to form a stacked cell. The first tab is connected with the first pole piece, the second tab is connected with the second pole piece, and the polarities of the first tab and the second tab are opposite. Optionally, the battery cell may be a winding type battery cell, that is, the first pole piece, the second pole piece opposite to the first pole piece, and the diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain the winding type battery cell.

In one embodiment, as shown in fig. 1, the unit cell 1 may be a square cell, that is, the unit cell 1 may be a quadrangular-type cell, where the quadrangular-type cell mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly defined straight line, and corners between sides are not necessarily right angles, and may be arc transitions. The quadrangular type battery can be a laminated battery, is convenient to group, and can be processed to obtain a single battery with longer length.

In one embodiment, the first included angle between the first conductive connecting surface 421 and the first surface 11 is a right angle, and the second included angle between the second conductive connecting surface 521 and the first surface 11 is a right angle, that is, the first conductive connecting surface 421 and the second conductive connecting surface 521 are arranged in parallel, when two adjacent single batteries 1 overlap, the first conductive connecting surface 421 of one single battery 1 and the second conductive connecting surface 521 of another single battery 1 are arranged in parallel, so that the first conductive connecting surface 421 of one single battery 1 and the second conductive connecting surface 521 of another single battery 1 overlap, and reliability when two adjacent single batteries 1 overlap is improved.

In one embodiment, in two adjacent unit cells 1, the area of the orthographic projection of the first conductive connecting surface 421 on the plane on which the second conductive connecting surface 521 is located is not less than one third, such as one third, one half, three fifths, two thirds, etc., of the area of the second conductive connecting surface 521. By making the orthographic projection area of the first conductive connection surface 421 on the plane where the second conductive connection surface 521 is located be not less than one third of the area of the second conductive connection surface 521, when two adjacent single batteries 1 are overlapped, and when the first conductive connection surface 421 of one single battery 1 is arranged in parallel with the second conductive connection surface 521 of the other single battery 1, the area of the overlapping area of the first conductive connection surface 421 and the overlapping second conductive surface is not less than one third of the area of the second conductive connection surface 521, thereby ensuring that the two adjacent single batteries 1 have enough overlapping area when being overlapped, ensuring the conductive reliability after the two adjacent single batteries 1 are overlapped, and relatively reducing the internal resistance of the overlapping position of the two single batteries 1.

In one embodiment, as shown in fig. 2, the first body portion 41 and the second body portion 51 are disposed at intervals along the width direction Z of the first surface 11. By arranging the first body portion 41 and the second body portion 51 at intervals in the width direction Z of the first surface 11, after the plurality of unit cells 1 are arranged in the first direction Y to form a battery pack, the first body portion 41 and the second body portion 51 can be led out from both sides in the width direction Z of the unit cells 1, respectively, so that the first conductive connecting surface 421 of one unit cell 1 is overlapped with the second conductive connecting surface 521 of the other unit cell 1.

In one embodiment, the first body portion 41 and the second body portion 51 overlap at least partially in the orthographic projection of the first surface 11 on the battery case 10 in the width direction Z. The arrangement of the first and second poles 40, 50 on the battery case 10 is facilitated by at least partially overlapping the orthographic projections of the first and second body portions 41, 51 on the battery case 10 in the width direction Z of the first surface 11, i.e., the first and second body portions 41, 51 are located at the same height or substantially at the same height relative to the first surface 11 of the battery case 10.

In one embodiment, the first body portion 41 and the second body portion 51 are located at a central position area of the first surface 11 in the length direction X of the battery case 10. By locating the first body portion 41 and the second body portion 51 in the central location area of the first surface 11, it is convenient to provide two cells of the same length within the battery case 10. In addition, when the plurality of unit cells 1 are arranged in the length direction X, there is a sufficient space between the positive electrode output ends of the unit cells 1 of the adjacent two rows arranged in the length direction X, and no arcing short circuit occurs, thereby ensuring the safety of the battery pack.

In one embodiment, as shown in fig. 5, the unit cell 1 further includes: the first battery cell 20 and the second battery cell 30, the first battery cell 20 and the second battery cell 30 are disposed in the battery case 10, and the first battery cell 20 and the second battery cell 30 are disposed opposite to each other along the length direction X of the battery case 10. Wherein the first body portion 41 is electrically connected to both the first battery cell 20 and the second battery cell 30, and the second body portion 51 is electrically connected to both the first battery cell 20 and the second battery cell 30.

As shown in fig. 5, the first battery cell 20 includes a first battery cell main body 210, a first positive electrode tab 220, and a first negative electrode tab 230, wherein the first positive electrode tab 220 and the first negative electrode tab 230 extend from one end of the first battery cell main body 210 along a length direction X of the battery case 10; the second battery cell 30 includes a second battery cell main body 310, a second positive electrode tab 320, and a second negative electrode tab 330, and the second positive electrode tab 320 and the second negative electrode tab 330 extend from one end of the second battery cell main body 310 along the length direction X of the battery case 10.

The first positive electrode tab 220 is electrically connected with the second positive electrode tab 320, the first negative electrode tab 230 is electrically connected with the second negative electrode tab 330, the extending directions of the first positive electrode tab 220 and the second positive electrode tab 320 are opposite, and the extending directions of the first negative electrode tab 230 and the second negative electrode tab 330 are opposite, so that the parallel connection of the first battery cell 20 and the second battery cell 30 is realized, and the two electrode leading-out ends of the first battery cell 20 and the second battery cell 30 can be led out from the same side of the battery case 10, so that the assembly of the single battery 1 is facilitated.

The first body portion 41 is electrically connected to the first positive electrode tab 220 of the first battery cell 20 and the second positive electrode tab 320 of the second battery cell 30 at the same time, and the second body portion 51 is electrically connected to the first negative electrode tab 230 of the first battery cell 20 and the second negative electrode tab 330 of the second battery cell 30 at the same time.

In one embodiment, as shown in fig. 4, the first surface 11 is provided with a receiving groove 111, and the first body portion 41 and the second body portion 51 are both located in the receiving groove 111. By providing the accommodating groove 111 on the first surface 11, the first body portion 41 of the first pole 40 and the second body portion 51 of the second pole 50 are located in the accommodating groove 111, so that the first body portion 41 and the second body portion 51 are accommodated, the condition that the first body portion 41 and the second body portion 51 protrude from the first surface 11 of the battery case 10 is improved, and further, when a plurality of single batteries 1 are grouped, the space utilization rate of the battery group is prevented from being influenced by the first body portion 41 and the second body portion 51 between adjacent single batteries 1, and the space utilization rate when a plurality of single batteries 1 are grouped is improved, so that the energy density of the battery group can be improved; meanwhile, the avoidance structure of the first body part 41 and the second body part 51 which avoid the protrusion is avoided from being arranged on the first surface 11 at the other side of the adjacent single battery 1, and the forming difficulty and the manufacturing cost of the battery shell 10 are reduced.

In one embodiment, as shown in fig. 4, the opposite second surfaces 12 are respectively provided with a first recess 121 and a second recess 122, the first recess 121 is used for receiving a portion of the second bus portion 52 and a portion of the first bus portion 42 of the other unit cell 1, and the second recess 122 is used for receiving a portion of the second bus portion 52 of the other unit cell 1. By providing the first recess 121 and the second recess 122 on the two opposite second surfaces 12, respectively, the first bus portion 42 and the second bus portion 52 are accommodated, so that the first bus portion 42 and the second bus portion 52 are prevented from protruding out of the second surfaces 12 or protruding out of the second surfaces too much, and the space occupied by the plurality of unit batteries 1 after grouping is relatively small.

In one embodiment, as shown in fig. 3, the first bus portion 42 includes a first portion 422 and a second portion 423, one end of the first portion 422 is connected to the first body portion 41, a portion of the first portion 422 is located in the accommodating recess 111, the second portion 423 is connected to the other end of the first portion 422, the second portion 423 includes a first conductive connecting surface 421, the second portion 423 is of a first L-shaped structure, and a portion of the second portion 423 is located in the first recess 121. The first bus portion 42 of the L-shaped structure leads the first main body portion 41 located on the first surface 11 out onto the second surface 12, so that the first bus portion 42 overlaps with the second conductive connecting surface 521 of the adjacent other unit cell 1 through the first conductive connecting surface 421 located on the second surface 12.

As shown in fig. 3, the second bus portion 52 includes a third portion 522 and a fourth portion 523, one end of the third portion 522 is connected to the second body portion 51, a portion of the third portion 522 is located in the accommodating recess 111, the fourth portion 523 is connected to the other end of the third portion 522, the fourth portion 523 includes a second conductive connecting surface 521, the fourth portion 523 is of a second L-shaped structure, and a portion of the fourth portion 523 is located in the second recess 122. The second bus portion 52 is led out to the second surface 12 by the second bus portion 52 of the L-shaped structure, so that the second bus portion 52 overlaps the first conductive connection surface 421 of the adjacent other unit cell 1 by the second conductive connection surface 521 on the second surface 12.

In one embodiment, as shown in fig. 2, the unit cell 1 further includes: the insulating support 60, the insulating support 60 is connected with the first pole 40, and the insulating support 60 is connected with the second pole 50. Wherein, insulating support 60 is connected with first confluence part 42, and insulating support 60 is connected with second confluence part 52, and insulating support 60 is integrated into a whole structure. By arranging the insulation between the first and second bus portions 42 and 52, the first and second bus portions 42 and 52 can be fixed on the insulation support 60, so that the structural strength of the first and second bus portions 42 and 52 is ensured, deformation of the first and second bus portions 42 and 52 due to external force is avoided, and the reliability of overlap joint is improved when the first and second conductive connection surfaces 421 and 521 of two adjacent single batteries 1 overlap joint. Meanwhile, after the first conductive connection surface 421 and the second conductive connection surface 521 of the adjacent two unit batteries 1 are overlapped, the stability of the overlap connection between the first conductive connection surface 421 and the second conductive connection surface 521 is improved through the insulating bracket 60, and the occurrence of the condition that the first conductive connection surface 421 and the second conductive connection surface 521 are in virtual connection or even separated is avoided.

The insulating bracket 60 may be made of an insulating plastic material, and the insulating bracket 60 is light in weight, high in stability, low in molding process difficulty and low in production cost. Of course, the insulating support 60 may also be made of an insulating material such as carbon fiber, which is not limited in the present utility model.

The insulating bracket 60 may be integrally injection molded, and the insulating bracket 60 is injection molded on the first pole 40 and the second pole 50. Through injection molding of the first pole 40 and the second pole 50 and the insulating support 60, the first pole 40, the second pole 50 and the insulating support 60 are fixedly connected together, the structural strength of the first converging portion 42 and the second converging portion 52 is further improved, deformation caused by external force applied to the first converging portion 42 and the second converging portion 52 is avoided, the first conductive connecting surface 421 and the second conductive connecting surface 521 of two adjacent single batteries 1 can be accurately lapped together, and the lapping reliability is further improved. Alternatively, the first pole 40 and the second pole 50 may be embedded, inserted or clamped on the insulating support 60.

Specifically, as shown in fig. 2, the insulating holder 60 is provided with a plurality of avoidance holes 61, and the plurality of avoidance holes 61 are used to expose the first body portion 41, the second body portion 51, the first conductive connection surface 421 and the second conductive connection surface 521. The plurality of escape through holes 61 for exposing the first body portion 41, the second body portion 51, the first conductive connecting surface 421 and the second conductive connecting surface 521 are provided on the insulating holder 60, so that the first body portion 41, the second body portion 51, the first conductive connecting surface 421 and the second conductive connecting surface 521 can be exposed for connection.

Wherein the plurality of avoidance holes 61 are arranged at intervals. By arranging the plurality of avoidance through holes 61 at intervals, the insulating support 60 forms a grid-like structure, the structural strength of the insulating support 60 is improved, and the weight of the insulating support 60 is reduced.

Specifically, as shown in fig. 2 and 6, the insulating bracket 60 is provided with a limiting groove 62, the battery pack further includes a low-voltage harness plate 70, the low-voltage harness plate 70 extends along the first direction Y, and at least a portion of the low-voltage harness plate 70 is located in the limiting groove 62. The low-voltage harness plate 70 is limited while being accommodated by the limiting groove 62.

Wherein, be provided with link 71 on the low pressure pencil board 70, be provided with on the insulating support 60 and dodge through-hole 61, link 71 is connected with first confluence part 42 or second confluence part 52 through dodging through-hole 61. The connecting end 71 is downwards folded from the low-voltage beam plate 70 and then placed in the avoidance through hole 61, so that a buffer space can be provided to avoid the failure of welding spots between the connecting end 71 and the low-voltage beam plate 70 during vibration, and the battery pack structure can be more compact.

The two limiting grooves 62 in the width direction Z of the plurality of single cells 1 are each provided with a low-voltage beam plate 70, and in two adjacent single cells 1, the first post 40 and the second post 50 of one single cell 1 are electrically connected with one low-voltage beam plate 70, and the first post 40 and the second post 50 of the other single cell 1 are electrically connected with the other low-voltage beam plate 70.

In one embodiment, as shown in fig. 4, the battery case 10 is provided with a liquid injection hole 13, and the liquid injection hole 13 is located between the first pole 40 and the second pole 50; wherein the avoiding through hole 61 is provided to expose the liquid injection hole 13. Electrolyte is injected into the first battery cell 20 and the second battery cell 30 through the electrolyte injection hole 13, and the electrolyte can uniformly infiltrate the first battery cell 20 and the second battery cell, so that the infiltration efficiency of the electrolyte is improved. Of course, the injection hole 13 may be located at one side of the first and second poles 40 and 50, or on a different surface from the first and second poles 40 and 50 of the battery case 10, which is not limited by the present disclosure.

In one embodiment, the length of the single battery 1 is equal to or greater than 400mm, and the length of the single battery 1 is, for example, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, or the like.

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 unit batteries 1.

It should be noted that, the plurality of unit batteries 1 may be disposed in the battery case after forming the battery module, and the plurality of unit batteries 1 may be fixed by the end plate and the side plate. The plurality of single cells 1 can be directly arranged in the battery box body, that is, the plurality of single cells 1 do not need to be grouped, and at this time, the end plate and the side plate can be removed.

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. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

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

Claims (19)

1. A battery pack comprising a plurality of unit cells (1) arranged in a first direction, the unit cells (1) comprising:

-a battery housing (10), the battery housing (10) comprising two opposing first surfaces (11) and four second surfaces (12) arranged around the first surfaces (11), the first surfaces (11) having an area larger than the area of the second surfaces (12), the first direction being perpendicular to the first surfaces (11);

a first pole (40), the first pole (40) is disposed on the first surface (11), the first pole (40) includes a first main body portion (41) and a first converging portion (42), at least a part of the first main body portion (41) and the first converging portion (42) are integrally formed, the first converging portion (42) includes a first conductive connecting surface (421), a first included angle is formed between the first conductive connecting surface (421) and the first surface (11), and the first conductive connecting surface (421) extends from one first surface (11) on which the first pole (40) is disposed in a direction away from the other first surface (11);

a second post (50), the second post (50) and the first post (40) are disposed on the same first surface (11), the second post (50) includes a second main body portion (51) and a second converging portion (52), at least part of the second main body portion (51) and the second converging portion (52) are integrally formed, the second converging portion (52) includes a second conductive connecting surface (521), a second included angle is formed between the second conductive connecting surface (521) and the first surface (11), and the second conductive connecting surface (521) extends from one first surface (11) on which the second post (50) is disposed toward a direction approaching the other first surface (11);

in the adjacent two single batteries (1), the first conductive connection surface (421) of one single battery (1) is opposite to the second conductive connection surface (521) of the other single battery (1), so that the adjacent two single batteries (1) are electrically connected.

2. The battery of claim 1, wherein the first included angle is a right angle and the second included angle is a right angle.

3. The battery pack according to claim 1, wherein the area of orthographic projection of the first conductive connection surface (421) on a plane on which the second conductive connection surface (521) is located in two adjacent unit cells (1) is not less than one third of the area of the second conductive connection surface (521).

4. The battery pack according to claim 1, wherein the first body portion (41) and the second body portion (51) are disposed at intervals in a width direction of the first surface (11).

5. The battery pack according to claim 1, wherein the first body portion (41) and the second body portion (51) overlap at least partially in an orthographic projection of the first surface (11) on the battery case (10) in a width direction thereof.

6. The battery pack according to claim 1, wherein the first body portion (41) and the second body portion (51) are located in a central position area of the first surface (11) along a length direction of the battery case (10).

7. The battery pack according to claim 6, wherein the unit cells (1) further include:

a first electric core (20), wherein the first electric core (20) is arranged in the battery shell (10);

the second battery cell (30), the second battery cell (30) is arranged in the battery shell (10), and the first battery cell (20) and the second battery cell (30) are oppositely arranged along the length direction of the battery shell (10);

wherein the first body portion (41) is electrically connected with the first electric core (20) and the second electric core (30) at the same time, and the second body portion (51) is electrically connected with the first electric core (20) and the second electric core (30) at the same time.

8. The battery pack according to claim 1, wherein the first surface (11) is provided with a receiving groove (111), and the first body portion (41) and the second body portion (51) are both located within the receiving groove (111).

9. The battery pack according to claim 8, wherein a first recess (121) and a second recess (122) are provided on the two opposite second surfaces (12), respectively, the first recess (121) being for receiving part of the second bus-section (52) and the first bus-section (42) of the other battery cell (1), the second recess (122) being for receiving part of the second bus-section (52) of the other battery cell (1).

10. The battery pack according to claim 9, wherein the first bus bar portion (42) includes a first portion (422) and a second portion (423), one end of the first portion (422) is connected to the first main body portion (41), a portion of the first portion (422) is located in the accommodating groove (111), the second portion (423) is connected to the other end of the first portion (422), the second portion (423) includes the first conductive connecting surface (421), the second portion (423) is of a first L-shaped structure, and a portion of the second portion (423) is located in the first recess (121);

the second converging portion (52) comprises a third portion (522) and a fourth portion (523), one end of the third portion (522) is connected to the second main body portion (51), a part of the third portion (522) is located in the accommodating groove (111), the fourth portion (523) is connected to the other end of the third portion (522), the fourth portion (523) comprises the second conductive connecting surface (521), the fourth portion (523) is of a second L-shaped structure, and a part of the fourth portion (523) is located in the second recess (122).

11. The battery pack according to any one of claims 1 to 10, wherein the unit cells (1) further include:

an insulating bracket (60), wherein the insulating bracket (60) is connected with the first pole (40), and the insulating bracket (60) is connected with the second pole (50);

the insulating support (60) is connected with the first converging portion (42), the insulating support (60) is connected with the second converging portion (52), and the insulating support (60) is of an integrated structure.

12. The battery pack according to claim 11, wherein the insulating holder (60) is integrally injection molded;

wherein the insulating support (60) is injection molded on the first pole (40) and the second pole (50).

13. The battery pack according to claim 11, wherein a plurality of relief through holes (61) are provided in the insulating holder (60), and a plurality of the relief through holes (61) are used to expose the first body portion (41), the second body portion (51), the first conductive connecting surface (421), and the second conductive connecting surface (521).

14. The battery pack according to claim 13, wherein a liquid injection hole (13) is provided in the battery case (10), the liquid injection hole (13) being located between the first pole (40) and the second pole (50);

wherein the avoidance through hole (61) is arranged to expose the liquid injection hole (13).

15. The battery pack according to claim 14, wherein a plurality of the escape through holes (61) are provided at intervals.

16. The battery pack according to claim 11, wherein the insulating bracket (60) is provided with a limiting groove (62), the battery pack further comprising a low voltage harness plate (70), the low voltage harness plate (70) extending in the first direction, at least a portion of the low voltage harness plate (70) being located within the limiting groove (62).

17. The battery pack according to claim 16, wherein a connection end (71) is provided on the low-voltage harness plate (70), an avoidance through hole (61) is provided on the insulating bracket (60), and the connection end (71) is connected with the first converging portion (42) or the second converging portion (52) through the avoidance through hole (61).

18. The battery pack according to any one of claims 1 to 10, wherein the unit cells are quadrangular type cells.

19. The battery pack according to any one of claims 1 to 10, wherein the length of the unit cells is equal to or greater than 400mm.