CN220042202U - 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 arranged along a first direction, wherein the single batteries comprise: the battery comprises a battery shell, an electric core and a pole column, wherein the battery shell is a conductive shell; the battery cell is arranged in the battery shell and comprises a battery cell main body, a first tab and a second tab, the first tab and the second tab extend out from at least one end of the battery cell main body, and the first tab is electrically connected with the battery shell; the pole is arranged on the battery shell, is insulated from the battery shell and comprises a main body part and a connecting part, and the main body part is electrically connected with the second lug; and the connecting part of one single battery is electrically connected with the battery shell of the other single battery, so that the adjacent two single batteries are electrically connected, and the number of accessories of the battery pack is reduced.

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 the bus bar, so that the number of accessories after the plurality of unit cells are grouped is large, and a welding process is required when the plurality of unit cells are connected through the bus bar, so that the assembly efficiency of the battery pack is low.

Disclosure of Invention

The utility model provides a battery pack, which reduces the number of accessories 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:

the battery shell is a conductive shell;

the battery cell is arranged in the battery shell and comprises a battery cell main body, a first tab and a second tab, wherein the first tab and the second tab extend out from at least one end of the battery cell main body, and the first tab is electrically connected with the battery shell;

the pole is arranged on the battery shell, is insulated from the battery shell and comprises a main body part and a connecting part, and the main body part is electrically connected with the second lug;

and the connecting part of one single battery is electrically connected with the battery shell of the other single battery in the adjacent two single batteries, so that the adjacent two single batteries are electrically connected.

In the battery pack provided by the disclosure, the battery shell of the single battery is a conductive shell, the first lug of the battery core is electrically connected with the conductive shell, and the second lug is electrically connected with the pole; when a plurality of batteries are grouped, the connection part of one single battery is electrically connected with the battery shell of the other single battery, so that the serial connection of the two adjacent single batteries is realized, one pole of the single batteries is canceled, meanwhile, the required accessories of the battery pack for reducing the conductive bars connected between the single batteries can be canceled, the required welding process when the two adjacent single batteries are serially connected can be reduced, the system internal resistance of the battery pack is reduced, the production cost is reduced, and the 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 structural view of a single battery according to an exemplary embodiment;

fig. 3 is a partial enlarged view of one type of unit cell according to an exemplary embodiment;

fig. 4 is a schematic structural view of a single cell shown according to another exemplary embodiment;

fig. 5 is a partial enlarged view of one unit cell according to another exemplary embodiment;

FIG. 6 is a schematic diagram illustrating a single cell opening according to an exemplary embodiment;

FIG. 7 is an enlarged schematic view illustrating the opening of a single cell according to an exemplary embodiment;

FIG. 8 is a schematic diagram of a cell and post and an adapter according to an exemplary embodiment;

FIG. 9 is a schematic diagram illustrating the connection of adjacent cells according to an exemplary embodiment;

FIG. 10 is an enlarged partial view of adjacent cell connections shown in accordance with an exemplary embodiment;

fig. 11 is a schematic view showing a battery module provided with a signal acquisition board according to an exemplary embodiment.

The reference numerals are explained as follows:

1. a single battery;

10. a battery case; 110. a first housing member; 120. a second housing member; 11. a first major surface; 111. a recess; 12. a second major surface; 13. a first minor surface; 130. a concave portion; 14. a second minor surface; 15. a liquid injection hole;

20. a battery cell; 21. a cell body; 22. a first tab; 23. a second lug;

30. a pole; 310. a main body portion; 320. a connection portion; 321. a first electrical connection surface;

40. an electrical connection; 410. a second electrical connection surface;

50. an insulating member;

60. an adapter;

70. and a signal acquisition board.

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.

The embodiment of the present disclosure provides a battery pack, as shown in fig. 1 to 10, the battery pack including a plurality of unit cells 1 arranged in a first direction X, the unit cells 1 including: the battery comprises a battery shell 10, a battery cell 20 and a pole post 30, wherein the battery shell 10 is a conductive shell, the battery cell 20 is arranged in the battery shell 10, the battery cell 20 comprises a battery cell main body 21, a first pole lug 22 and a second pole lug 23, the first pole lug 22 and the second pole lug 23 extend from at least one end of the battery cell main body 21, and the first pole lug 22 is electrically connected with the battery shell 10; the electrode post 30 is disposed on the battery case 10, the electrode post 30 is insulated from the battery case 10, the electrode post 30 includes a main body portion 310 and a connection portion 320, and the main body portion 310 is electrically connected to the second tab 23.

Among the adjacent two unit cells 1, the connection portion 320 of one unit cell 1 is electrically connected with the cell case 10 of the other unit cell 1 so that the adjacent two unit cells 1 are electrically connected.

In the battery pack provided by the disclosure, the battery shell 10 of the single battery 1 is a conductive shell, the first tab 22 of the battery core 20 is electrically connected with the conductive shell, and the second tab 23 is electrically connected with the pole 30; when a plurality of batteries are grouped, as shown in fig. 9 and 10, in two adjacent single batteries 1, the connection part 320 of one single battery 1 is electrically connected with the battery housing 10 of the other single battery 1, so that the serial connection of two adjacent single batteries 1 is realized, one pole 30 of the single battery 1 is canceled, meanwhile, the required accessories of the battery pack for reducing the conductive bars connected between the single batteries 1 can be canceled, the welding process required when the two adjacent single batteries 1 are serially connected can be reduced, the system internal resistance of the battery pack is reduced, the production cost is reduced, and the assembly efficiency of the battery pack is improved.

In addition, as shown in fig. 3, 5 and 11, the first electrical connection surface 321 and the second electrical connection surface 410 are located on the same side of the battery case 10, and after the plurality of unit batteries 1 are grouped, the voltage can be collected on the same side through the signal collection board 70, thereby improving maintainability.

The unit cell 1 includes the cell 20 and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell 20 is a unit formed by winding or laminating the stacked portion. The battery cell 20 includes a battery cell body 21, a first tab 22, and a second tab 23. The cell body 21 has a first electrode sheet, a second electrode sheet, which is electrically opposite to the first electrode sheet, and a diaphragm sheet disposed between the first electrode sheet and the second electrode sheet, stacked one on another, so that a plurality of pairs of the first electrode sheet and the second electrode sheet are stacked to form a stacked-type cell. The first tab 22 is connected with the first pole piece, the second tab 23 is connected with the second pole piece, and the polarities of the first tab 22 and the second tab 23 are opposite. Alternatively, the battery cell 20 may be a winding type battery cell, that is, a first pole piece, a second pole piece opposite to the first pole piece, and a 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.

The battery case 10 includes a first large surface 11 and a second large surface 12 opposite to each other, and two first small surfaces 13 and two second small surfaces 14 opposite to each other, wherein the area of the first small surface 13 is larger than that of the second small surface 14, the areas of the first large surface 11 and the second large surface 12 are both larger than that of the first small surface 13, and the first direction X is perpendicular to the first large surface 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.

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 the battery cell 20, the first case member 110 forms a first large surface 11, the second case member 120 forms a second large surface 12, two first small surfaces 13 and two second small surfaces 14, and the post 30 is disposed on the first large surface 11 of the first case member 110.

In one embodiment, the connection portion 320 of the single battery 1 is directly connected with the battery case 10 of another single battery 1, that is, when the plurality of single batteries 1 are grouped, the connection portion 320 of the pole post 30 of one single battery 1 is directly connected with the battery case 10 of another single battery 1 in two adjacent single batteries 1, so as to realize electrical connection, improve the grouping efficiency of the plurality of single batteries 1, further reduce all accessories of the battery pack, reduce the manufacturing cost and weight of the battery pack, and improve the integration level of the battery pack.

In one embodiment, as shown in fig. 2 to 8, the unit cell 1 further includes: an electrical connection 40. The electric connector 40 is arranged on the battery shell 10 and is electrically connected with the battery shell 10; in the adjacent two unit cells 1, the electrical connection member 40 of one unit cell 1 is electrically connected with the connection portion 320 on the other unit cell 1. The connection part 320 of the pole 30 of the adjacent single battery 1 is connected with the electric connector 40 to realize the serial connection of the adjacent two single batteries 1, thereby improving the convenience and reliability of the electric connection of the connection part 320 of the single battery 1 and the battery shell 10 of the other single battery 1.

In one embodiment, the electrical connector 40 is of unitary construction with the battery housing 10 as shown in fig. 2 and 3. The electrical connector 40 may be a connection structure extending from the first housing member 110, and is integrally formed with the first housing member 110; alternatively, the connecting member may be a connecting structure extending from the second housing member 120, and is integrally formed with the second housing member 120; alternatively, the electrical connector 40 includes a connection structure extending from the first housing member 110 and a connection structure extending from the second housing member 120, so as to be formed by integrally forming with the first housing member 110 and the second housing member 120, and simultaneously enhance the structural strength of the electrical connector 40, reduce the internal resistance of the electrical connection between the electrical connector 40 and the battery housing 10, avoid the welding process of the electrical connector 40 and the battery housing 10, and improve the battery grouping efficiency.

In one embodiment, as shown in fig. 4 and 5, the electrical connector 40 is of a split type construction with the battery housing 10. The electrical connector 40 may be connected to the battery case 10 by welding, bonding, clamping, riveting, screwing, or the like, which is not limited in the present disclosure. The electric connector 40 and the battery case 10 are in a split structure, so that the installation position of the electric connector 40 on the battery case 10 can be conveniently adjusted to be electrically connected with the connection part 320 of the pole 30 of the other single battery 1.

In one embodiment, as shown in fig. 6 to 8, the single battery 1 further includes an adapter 60, and the first tab 22 is connected with the battery case 10 through the adapter 60, so that the stability of connection between the first tab 22 and the battery case 10 is improved, and the first tab 22 is prevented from falling off from the battery case 10.

In one embodiment, the connection portion 320 includes a first electrical connection face 321 and the electrical connector 40 includes a second electrical connection face 410; in the adjacent two unit cells 1, the first electrical connection surface 321 of one unit cell 1 is disposed opposite to the second electrical connection surface 410 of the other unit cell 1, so that the adjacent two unit cells 1 are electrically connected. In the adjacent two single batteries 1, the first conductive connection surface of one single battery 1 is opposite to the second conductive connection surface of the other single battery 1, so that the pole post 30 is self-lapped when the adjacent two single batteries 1 are stacked, and a plurality of single batteries are connected in series along the first direction X; the two adjacent single batteries 1 are connected in series by the self-lap joint mode of the first conductive connecting surface and the second conductive connecting surface of the other single battery 1, so that the welding process required by the connection of the two adjacent single batteries 1 is reduced, and the system internal resistance of the battery pack is reduced.

In one embodiment, the connection portion 320 of the post 30 is perpendicular to the first large surface 11, i.e., the connection portion 320 is parallel to the first small surface 13 of the battery case 10, facilitating the overlap of the connection portion 320 with the electrical connector 40 when the connection portion 320 of the post 30 overlaps with the electrical connector 40 of another unit battery 1. Enabling a sufficient overlap area between the connection portion 320 and the electrical connector 40. Alternatively, the main body portion 310 is perpendicular to the connection portion 320, and the main body portion is disposed on the first large surface 11, and the connection portion 320 is perpendicular to the first large surface 11, so that when the connection portion 320 of the pole 30 overlaps the electrical connector 40 of the other unit cell 1, overlapping of the connection portion 320 and the electrical connector 40 is facilitated. Alternatively, the connection portion 320 of the post 30 is perpendicular to the first large surface 11, the main body portion 310 is perpendicular to the connection portion 320, and the portion of the post 30 located outside the battery case 10 is L-shaped so that the post 30 overlaps with the electrical connection 40 of another unit battery 1.

In one embodiment, as shown in fig. 3 and 5, the main body portion 310 is located on the first large surface 11, and the connection portion 320 extends from the end of the first large surface 11 toward a direction away from the second large surface 12, that is, the connection portion 320 is disposed protruding from the first large surface 11 and can be located on the first small surface 13 of the adjacent unit cell 1.

Wherein, the electrical connector 40 is disposed on the first small surface 13, and the electrical connector 40 extends from the end of the first large surface 11 toward the direction approaching the second large surface 12, that is, the extending direction of the connecting portion 320 is opposite to the extending direction of the electrical connector 40. When a plurality of single batteries 1 are grouped, in two adjacent single batteries 1, the connection part 320 of one battery is conveniently overlapped with the surface of the electric connecting piece 40 of the other battery, the reliability of the overlap joint of the connection part 320 of the adjacent single battery 1 and the electric connecting piece 40 is improved, and the assembly efficiency of the battery pack is improved.

Wherein the electrical connection 40 of one cell 1 has an overlapping portion with the orthographic projection of the connection portion 320 of the other cell 1 on the first small surface 13. In the adjacent two single batteries 1, the electrical connection piece 40 of one single battery 1 and the connection part 320 of the other single battery 1 are overlapped, so that the connection area after being overlapped is increased, and the reliability after being overlapped is improved.

The overlapping area of the electrical connector 40 of one single battery 1 and the connecting portion 320 of the other single battery 1 after overlapping is not less than one third, such as one third, one half, three fifths, two thirds, etc., of the area of the first electrical connecting surface 321 and the second electrical connecting surface 410, so as to ensure that the adjacent two single batteries 1 have enough overlapping area when overlapping, ensure the conductive reliability of the adjacent single batteries 1 after overlapping, and relatively reduce the internal resistance of the overlapping position of the two single batteries 1.

Wherein, along the height direction Z of the single battery 1, a height difference exists between the first electric connection surface 321 and the second electric connection surface 410. By enabling the first electrical connection surface 321 and the second electrical connection surface 410 of the single battery 1 to have a height difference in the height direction Z of the single battery 1, when the first electrical connection surfaces 321 and the second electrical connection surfaces 410 of two adjacent single batteries 1 overlap, overlapping and overlapping of the first electrical connection surfaces 321 and the second electrical connection surfaces 410 are facilitated, and reliability and convenience of overlapping are improved.

In one embodiment, as shown in fig. 2 and 4, a recess 130 is formed on the first small surface 13 of the unit cell 1, and the recess 130 is used to receive at least part of the electrical connector 40 and the connection portion 320 of another unit cell 1. By forming the recess 130 on the first small surface 13, the receiving of the connection portion 320 of the electrical connector 40 and the pole 30 is formed, so that the connection portion 320 of the electrical connector 40 and the pole 30 is prevented from protruding or protruding too much from the first small surface 13, and the space occupied by the plurality of unit cells 1 after grouping is relatively small.

In one embodiment, as shown in fig. 2 and 4, the first large surface 11 of the unit cell 1 is provided with a recess 111, and the main body portion 310 of the post 30 is accommodated in the recess 111. By arranging the concave 111 on the first large surface 11, the main body part 310 of the pole 30 is accommodated in the concave 111, so that the accommodation of the main body part 310 of the pole 30 is realized, the condition that the main body part 310 of the pole 30 protrudes out of the first large surface 11 of the battery shell 10 is improved, when a plurality of single batteries 1 are grouped, the influence of the main body part 310 of the pole 30 on the space utilization of the battery group between the adjacent single batteries 1 is avoided, the space utilization of the battery group when the single batteries 1 are grouped is improved, and the energy density of the battery group is improved; meanwhile, the avoidance structure of the main body part 310 of the avoidance convex pole 30 arranged on the second large surface 12 of the other side of the adjacent single battery 1 can be avoided, and the forming difficulty and the manufacturing cost of the battery shell 10 are reduced.

In one embodiment, as shown in fig. 3 and 5, the unit cell 1 further includes: the insulator 50, the insulator 50 is disposed on the battery case 10, and the post 30 is disposed on the insulator 50. Through setting up insulating part 50 on battery case 10 to guarantee that utmost point post 30 and battery case 10 are insulating to be set up, simultaneously, still formed fixed spacing effect to utmost point post 30 through insulating part 50, promoted the structural strength of utmost point post 30, thereby further guaranteed the reliability of the first electric connection face 321 and the second electric connection face 410 overlap joint of two adjacent battery cells 1.

The material of the insulating member 50 may be an insulating plastic material, and the insulating member 50 is made of a plastic material, so that the insulating member 50 has a light weight, high stability, low molding process difficulty and low production cost. Of course, the insulating member 50 may also be made of an insulating material such as carbon fiber, which is not limited by the present disclosure.

In one embodiment, the battery cell 20 includes a battery cell main body 21, a first tab 22 and a second tab 23, and the first tab 22 and the second tab 23 of the battery cell 20 extend from one end of the battery cell main body 21 along the length direction X of the battery case 10. Of course, the first tab 22 and the second tab 23 may extend from two ends of the battery main body 21 along the length direction X of the battery case 10, so as to ensure that the first tab 22 can be electrically connected with the battery case 10, which is not limited in the disclosure.

In one embodiment, as shown in fig. 6 to 8, the unit battery 1 includes two battery cells 20, the two battery cells 20 are disposed in the battery case 10, and the two battery cells 20 are disposed along the length direction X of the battery case 10. Wherein the first body portion 310 is electrically connected to both of the cells 20 at the same time, and the second body portion 310 is electrically connected to both of the cells 20 at the same time.

As shown in fig. 7 and 8, each of the two battery cells 20 includes a battery cell main body 21, a first tab 22 and a second tab 23, and the first tab 22 and the second tab 23 of each of the two battery cells 20 extend from one end of the battery cell main body 21 along the length direction X of the battery case 10. Of course, the first tab 22 and the second tab 23 may extend from two ends of the battery main body 21 along the length direction X of the battery case 10, so as to ensure that the first tab 22 can be electrically connected with the battery case 10, which is not limited in the disclosure.

The first tabs 22 of the two electric cores 20 are electrically connected, the second tabs 23 of the two electric cores 20 are electrically connected, the extending directions of the first tabs 22 of the two electric cores 20 are opposite, the extending directions of the second tabs 23 of the two electric cores 20 are opposite, so that the parallel connection of the two electric cores 20 is realized, and the two electrode leading-out ends of the two electric cores 20 can be led out from the same side of the battery shell 10, so that the assembly of the single battery 1 is facilitated.

The battery case 10 is electrically connected to the first tabs 22 of the two battery cells 20 at the same time, and the post 30 is electrically connected to the second tabs 23 of the two battery cells 20 at the same time.

When the battery case 10 is an aluminum case, the post 30 is a negative electrode, and the battery case 10 is a positive electrode; when the battery case 10 is a steel case, the post 30 is a positive electrode, and the battery case 10 is a negative electrode. If the potential of aluminum is lower than that of the anode, lithium ions in the battery can react with aluminum electrochemically due to the high oxidation potential of aluminum, and the aluminum shell can be corroded to generate aluminum-lithium alloy, so that the strength of the shell is reduced, and if aluminum is used as the shell, the shell needs to be used as the anode; however, since the oxidation potential of steel is low and electrochemical corrosion is less likely to occur, the steel can be used as the negative electrode, and the battery case 10 can be used as the negative electrode with higher safety than the battery case 10 can be used as the positive electrode. Therefore, when the battery case 10 is an aluminum case, the requirement of an insulation design outside the battery case 10 is also higher.

In one embodiment, as shown in fig. 3 and 5, the pole 30 is located on the side of the first major surface 11 adjacent to the first minor surface 13. By locating the post 30 on the side of the first major surface 11 that is adjacent to the first minor surface 13, the post 30 can be located on the same side of the battery housing 10 as the electrical connector 40, facilitating overlap of the post 30 with the adjacent cell 1. At the same time, the post 30 can be connected to the second tab 23 adjacent to the first minor surface 13, reducing the structural size of the post 30. In addition, the connection part 320 of the pole 30 and the electrical connector 40 are located on the same side of the battery case 10, i.e. the high voltage connection is on the same side, the battery can be connected at high voltage and low voltage after being put into the case, in-situ assembly is realized, voltage collection on the same side can be realized, and maintainability is improved.

In one embodiment, as the single battery 1 further comprises: and (3) cooling the assembly. The cooling assembly is provided on one side of the first minor surface 13 and the electrical connection 40 is located between the cooling assembly and the battery housing 10. Since the connection portion 320 of the post 30 and the electrical connector 40 are located on the same side of the battery case 10, the cooling assembly is disposed on one side of the first small surface 13, and the increase of cooling power can achieve higher-rate charging, further shortening the fast charging time.

In one embodiment, as shown in fig. 2 and 4, the battery case 10 is provided with a liquid injection hole 15, and the liquid injection hole 15 is located at a middle position of the first large surface 11. Electrolyte is injected into the first battery cell 20 and the second battery cell 20 through the electrolyte injection hole 15, and the electrolyte can uniformly infiltrate the first battery cell 20 and the second battery cell 20, so that the infiltration efficiency of the electrolyte is improved. Wherein, the liquid injection hole 15 is provided with a sealing plug to seal the liquid injection hole 15 after electrolyte is added.

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 (18)

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

a battery case (10), the battery case (10) being a conductive case;

the battery cell (20), the battery cell (20) is arranged in the battery shell (10), the battery cell (20) comprises a battery cell main body (210), a first tab (22) and a second tab (23), the first tab (22) and the second tab (23) extend out from at least one end of the battery cell main body (210), and the first tab (22) is electrically connected with the battery shell (10);

a pole (30), the pole (30) is disposed on the battery housing (10), the pole (30) is insulated from the battery housing (10), the pole (30) includes a main body portion (310) and a connection portion (320), and the main body portion (310) is electrically connected with the second tab (23);

wherein, in two adjacent single batteries (1), the connection part (320) of one single battery (1) is electrically connected with the battery shell (10) of the other single battery (1), so that two adjacent single batteries (1) are electrically connected.

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

an electrical connector (40), wherein the electrical connector (40) is arranged on the battery shell (10) and is electrically connected with the battery shell (10); in two adjacent single batteries (1), the electric connector (40) of one single battery (1) is electrically connected with the connecting part (320) of the other single battery (1).

3. The battery according to claim 2, wherein the electrical connection member (40) is of an integrally formed structure with the battery case (10).

4. The battery pack according to claim 2, wherein the electrical connection member (40) and the battery case (10) are of a split structure.

5. The battery according to claim 2, wherein the connection portion (320) comprises a first electrical connection face (321), and the electrical connector (40) comprises a second electrical connection face (410); in the adjacent two single batteries (1), the first electric connection surface (321) of one single battery (1) is opposite to the second electric connection surface (410) of the other single battery (1), so that the adjacent two single batteries (1) are electrically connected.

6. The battery pack according to claim 2, wherein the battery case (10) is formed with a first large surface (11) and a second large surface (12) that are disposed opposite to each other, and two first small surfaces (13) and two second small surfaces (14) that are disposed opposite to each other, the first small surfaces (13) having an area larger than that of the second small surfaces (14), and the first large surfaces (11) and the second large surfaces (12) each having an area larger than that of the first small surfaces (13);

wherein, the first direction is perpendicular to the first large surface (11), and the pole (30) is arranged on the first large surface (11).

7. The battery according to claim 6, characterized in that the electrical connection (40) is provided on the first small surface (13), the electrical connection (40) extending from the end of the first large surface (11) towards the direction of approach of the second large surface (12).

8. The battery pack according to claim 7, wherein in two adjacent unit cells (1), the electrical connection (40) of one of the unit cells (1) and the orthographic projection of the connection portion (320) of the other unit cell (1) on the first small surface (13) have overlapping portions.

9. The battery pack according to claim 7, wherein a recess (130) is formed on the first small surface (13), the recess (130) being for receiving at least part of the electrical connector (40) and the connection portion (320) of the other unit cell (1).

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

and the cooling assembly is arranged on one side of the first small surface (13), and the electric connector (40) is positioned between the cooling assembly and the battery shell (10).

11. The battery pack according to claim 1, wherein the battery case (10) is formed with a first large surface (11) and a second large surface (12) that are disposed opposite to each other, and two first small surfaces (13) and two second small surfaces (14) that are disposed opposite to each other, the first small surfaces (13) having an area larger than that of the second small surfaces (14), and the first large surfaces (11) and the second large surfaces (12) each having an area larger than that of the first small surfaces (13);

wherein, the first direction is perpendicular to the first large surface (11), and the pole (30) is arranged on the first large surface (11).

12. The battery according to claim 11, wherein the connection portion (320) is perpendicular to the first large surface (11) and/or the main body portion (310) is perpendicular to the connection portion (320).

13. The battery according to claim 11, wherein the main body portion (310) is located on the first large surface (11), and the connection portion (320) extends from the first large surface (11) toward a direction away from the second large surface (12).

14. Battery according to claim 11, characterized in that the pole (30) is located on the first large surface (11) on the side close to the first small surface (13) and/or that a recess (111) is formed on the first large surface (11), the body portion (310) being accommodated in the recess (111).

15. The battery pack according to any one of claims 1 to 14, wherein the unit cells (1) include two of the electric cells (20), the two electric cells (20) being disposed along a length direction of the battery case (10);

wherein the battery case (10) is electrically connected with the first tabs (22) of the two battery cells (20) at the same time, and the main body portion (310) is electrically connected with the second tabs (23) of the two battery cells (20) at the same time.

16. The battery pack according to any one of claims 1 to 14, wherein the unit cells (1) further include:

an insulator (50), the insulator (50) is disposed on the battery case (10), and the pole (30) is disposed on the insulator (50).

17. The battery according to any one of claims 1 to 14, wherein the battery case (10) is an aluminum case, the post (30) is a negative electrode, and the battery case (10) is a positive electrode; alternatively, the battery case (10) is a steel case, the post (30) is a positive electrode, and the battery case (10) is a negative electrode.

18. The battery pack according to any one of claims 1 to 14, wherein the unit cells are quadrangular type cells.