CN219371288U - Battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack, which comprises: the first battery is provided with a pole; the second battery is provided with a recess, the first battery and the second battery are stacked along the first direction, at least part of the pole is accommodated in the recess, and a gap is reserved between the pole and the second battery; the maximum distance between one side of the pole facing the recess and the second battery is a, the minimum distance between the pole and the second battery is b, and a/b is 2.5-10, so that the pole can be ensured to have reliable size, the overcurrent capacity of the pole is improved, the reliable insulation distance between the pole and the second battery can be ensured, and the short circuit risk is avoided, thereby improving the safety use performance of the battery pack.

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, a battery pack may include a plurality of batteries electrically connected through a post assembly, and a risk of a short circuit between the post assembly and an adjacent battery may occur due to a position limitation between the adjacent batteries and a structural limitation of the batteries themselves, or a risk of a weak overcurrent capability of the post assembly.

Disclosure of Invention

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

The present utility model provides a battery pack including:

the first battery is provided with a pole;

the second battery is provided with a recess, the first battery and the second battery are stacked along the first direction, at least part of the pole is accommodated in the recess, and a gap is reserved between the pole and the second battery;

the maximum distance between one side of the pole towards the recess and the second battery is a, and the minimum distance between the pole and the second battery is b, wherein a/b is more than or equal to 2.5 and less than or equal to 10.

The battery pack according to the embodiment of the utility model comprises the first battery and the second battery, the first battery and the second battery are stacked along the first direction, at least part of the pole of the first battery is accommodated in the recess of the second battery, so that the space utilization rate of the battery pack is improved, the space utilization rate of the battery pack is improved by enabling a gap to be formed between the pole and the second battery, the maximum distance between the side, facing the recess, of the pole and the second battery is a, the minimum distance between the pole and the second battery is b, and the a/b is less than or equal to 2.5 and less than or equal to 10, the reliable size of the pole can be ensured, the overcurrent capacity of the pole is improved, the reliable insulation distance between the pole and the second battery can be ensured, and the short circuit risk is avoided, so that the safe use performance 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 partial schematic structure of a battery pack according to an exemplary embodiment;

fig. 2 is a partial schematic structure of a first battery of a battery pack according to an exemplary embodiment;

fig. 3 is a partial schematic structure of a second battery of a battery pack according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a first battery; 11. a pole; 111. a first portion; 112. a second portion; 12. a first major surface; 20. a second battery; 21. a recess; 22. a second major surface; 23. and a battery case.

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, referring to fig. 1 to 3, including: a first battery 10, a pole 11 being provided on the first battery 10; a second battery 20, the second battery 20 is provided with a recess 21, the first battery 10 and the second battery 20 are stacked along the first direction, at least part of the pole 11 is accommodated in the recess 21, and a gap is formed between the pole 11 and the second battery 20; wherein, the maximum distance between the side of the pole 11 facing the concave 21 and the second battery 20 is a, and the minimum distance between the pole 11 and the second battery 20 is b, and a/b is 2.5-10.

The battery pack according to one embodiment of the present utility model includes the first battery 10 and the second battery 20, the first battery 10 and the second battery 20 are stacked along the first direction, at least a portion of the post 11 of the first battery 10 is received in the recess 21 of the second battery 20, thereby improving the space utilization rate of the battery pack, by making a gap between the post 11 and the second battery 20, and a maximum distance between a side of the post 11 facing the recess 21 and the second battery 20 is a, and a minimum distance between the post 11 and the second battery 20 is b,2.5 a/b is less than or equal to 10, not only ensuring that the post 11 has a reliable size, improving the overcurrent capability of the post 11, but also ensuring that a reliable insulation distance between the post 11 and the second battery 20, and avoiding the occurrence of a short-circuit risk, thereby improving the safe use performance of the battery pack.

It should be noted that, as shown in fig. 1, the first battery 10 is provided with the pole 11, the second battery 20 is provided with the recess 21, and after the first battery 10 and the second battery 20 are stacked along the first direction, at least part of the pole 11 is received in the recess 21, so that the risk that the size of the battery pack is increased by the pole 11 can be reduced, thereby improving the space utilization rate of the battery pack and further ensuring the energy density of the battery pack.

As shown in fig. 1, a gap is formed between the pole 11 and the second battery 20, so that an insulation space can be ensured between the pole 11 and the second battery 20, and the risk of short circuit between the first battery 10 and the second battery 20 is avoided.

As shown in fig. 1, the maximum distance between the side of the pole 11 facing the recess 21 and the second battery 20 is denoted as a, the minimum distance between the pole 11 and the second battery 20 is denoted as b, and the ratio of the maximum distance a between the side of the pole 11 facing the recess 21 and the second battery 20 to the minimum distance b between the pole 11 and the second battery 20 is 2.5-10.

The ratio of the maximum distance a between the side of the pole 11 facing the recess 21 and the second battery 20 to the minimum distance b between the pole 11 and the second battery 20 may be 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 9.5 or 10, etc.

When the ratio of the maximum distance a between the side of the pole 11 facing the recess 21 and the second battery 20 to the minimum distance b between the pole 11 and the second battery 20 is too large, the pole 11 may not flow sufficiently, and the overall heat generation of the battery pack may be serious; when the ratio of the maximum distance a between the side of the pole 11 facing the recess 21 and the second battery 20 to the minimum distance b between the pole 11 and the second battery 20 is too small, the pole 11 is too close to the second battery 20, so that there is a risk of short-circuiting between the first battery 10 and the second battery 20.

In one embodiment, as shown in fig. 2 and 3, the pole 11 is disposed on the first large surface 12 of the first cell 10 and the recess 21 is disposed on the second large surface 22 of the second cell 20; wherein, the first direction is perpendicular to the first large surface 12 and the second large surface 22, i.e., the first large surface 12 of the first battery 10 and the second large surface 22 of the second battery 20 may be disposed opposite to each other, thereby improving the space utilization of the battery pack, and may facilitate the grouping of the battery pack, and improving the grouping efficiency of the battery pack.

It should be noted that the first large surface 12 of the first battery 10 may be regarded as a surface with the largest area of the first battery 10, further, the first large surface 12 of the first battery 10 may be regarded as a surface with the largest heat generation of the first battery 10, for example, the first battery 10 may have a rectangular structure, and the first large surfaces 12 of the first battery 10 may be two opposite surfaces. The second large surface 22 of the second cell 20 may be considered as the surface of the second cell 20 having the largest area, and further, the second large surface 22 of the second cell 20 may be considered as the surface of the second cell 20 having the largest heat generation, for example, the second cell 20 may have a rectangular structure, and the second large surfaces 22 of the second cell 20 may be two opposite.

In one embodiment, as shown in fig. 3, the second battery 20 includes a battery housing 23, the recess 21 is disposed on the battery housing 23, a maximum distance between a side of the pole 11 facing the recess 21 and the battery housing 23 is a, a minimum distance between the pole 11 and the battery housing 23 is b, and by making a ratio of the maximum distance a between the side of the pole 11 facing the recess 21 and the second battery 20 to the minimum distance b between the pole 11 and the second battery 20 be 2.5-10, a risk of electrical connection between the pole 11 and the battery housing 23 can be effectively avoided, and reliable overcurrent capability of the pole 11 can be ensured.

The battery case 23 is a metal case, for example, the battery case 23 may be a steel case, or the battery case 23 may be an aluminum case.

In one embodiment, the capacity of the first battery 10 is greater than or equal to 100ah,3 is greater than or equal to a/b is greater than or equal to 6, and the safety performance of the battery pack can be effectively ensured by adapting the capacity of the first battery 10 to the overcurrent capacity of the pole 11 and the distance between the pole 11 and the second battery 20, so that the overcurrent capacity requirement of the pole 11 can be met, and the insulation distance requirement can also be met.

The capacity of the first battery 10 may be 100Ah, 110Ah, 120Ah, 130Ah, 140Ah, 150Ah, 160Ah, 170Ah, 180Ah, or the like.

In one embodiment, the first battery 10 includes a plurality of stacked pole pieces, the number of the pole pieces is equal to or greater than 50,3.5 a/b is equal to or less than 7, and when the number of the pole pieces exceeds 50, the requirement on the overcurrent capability of the pole 11 is high, so that the overcurrent capability of the pole 11 can be effectively ensured by ensuring that the ratio of the maximum distance a between the side of the pole 11 facing the recess 21 and the second battery 20 to the minimum distance b between the pole 11 and the second battery 20 is 3.5-7.

The number of pole pieces may be 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100, etc.

The first battery 10 and the second battery 20 are each represented as a battery including an electric core and an electrolyte, and a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

The first battery 10 may be a laminated battery, so that not only is the battery convenient to group, but also the battery with longer length can be obtained through processing. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell. The number of pole pieces may be equal to the sum of the first pole piece and the first pole piece.

Alternatively, the first battery 10 may be a wound battery, i.e., a first pole piece, a second pole piece opposite to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell. And the winding type battery cell is twice as many as the first pole pieces and the sum of the first pole pieces along the radial direction of the winding hole.

It should be noted that the second battery 20 may be a laminated battery, or the second battery 20 may be a wound battery.

In one embodiment, the recess 21 is disposed at an end of the second battery 20 along a length direction of the second battery 20, that is, the recess 21 may intersect at least one end surface of the second battery 20, so that the formation of the recess 21 may be facilitated, which is advantageous for space utilization of the battery pack.

The second battery 20 may include one cell, or the second battery 20 may include a plurality of cells stacked in the thickness direction of the second battery 20.

In one embodiment, the recess 21 is provided at the middle of the second battery 20 in the length direction of the second battery 20, i.e., the recess 21 does not intersect with the end surface of the second battery 20, thereby making rational use of the space of the second battery 20.

The second battery 20 may include at least two cells, and the at least two cells may be arranged along a length direction of the second battery 20.

In one embodiment, as shown in fig. 1 and 2, the pole 11 includes: a first portion 111, the first portion 111 being disposed on the first battery 10; the second portion 112, the second portion 112 is connected to the first portion 111, and the second portion 112 extends from an end connected to the first portion 111 toward a direction approaching the second battery 20, so that an included angle is formed between the second portion 112 and the first portion 111, thereby facilitating connection of the second portion 112 to a bus bar through which electrical connection between the first battery 10 and the second battery 20 is achieved.

In one embodiment, the second portion 112 is perpendicular to the first portion 111, which not only facilitates the formation of the pole 11 and improves the manufacturing efficiency of the battery pack, but also facilitates the connection of the second portion 112 with the bus bar, thereby improving the assembly efficiency of the battery pack.

In one embodiment, the maximum distance between the area where the second portion 112 is connected to the first portion 111 and the second battery 20 is a, that is, the area where the second portion 112 is connected to the first portion 111 is farthest from the second battery 20, so that not only the positions of the pole 11 and the recess 21 can be reasonably determined, and the safety performance of the battery pack can be improved.

In one embodiment, the first cell 10 and the second cell 20 are both quadrangular cells. The quadrangular battery mainly refers to a prismatic shape, but whether each side of the prism is a straight line with strict meaning is not strictly limited, and the corners between the sides are not necessarily right angles, and can be arc transition.

It should be noted that the structures of the first battery 10 and the second battery 20 may be substantially identical, and certainly, it is not excluded that the structures of the first battery 10 and the second battery 20 may not be identical.

The first battery 10 may be provided with two poles 11, and the second battery 20 may be provided with two recesses 21, the two poles 11 and the two recesses 21 corresponding respectively. Alternatively, two poles 11 may be provided on the first battery 10, and one recess 21 may be provided on the second battery 20, and one recess 21 may be used to receive two poles 11.

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 can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries.

It should be noted that, a plurality of batteries may be disposed in the battery case after forming the battery module, and may be fixed by the end plate and the side plate. The plurality of cells may be disposed directly in the cell case, i.e., without grouping the plurality of cells, at which time the end plates and the side plates may 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 (12)

1. A battery pack, comprising:

a first battery (10), wherein a pole (11) is arranged on the first battery (10);

a second battery (20), wherein a recess (21) is arranged on the second battery (20), the first battery (10) and the second battery (20) are stacked along a first direction, at least part of the pole (11) is accommodated in the recess (21), and a gap is formed between the pole (11) and the second battery (20);

wherein the maximum distance between the side of the polar column (11) facing the concave (21) and the second battery (20) is a, and the minimum distance between the polar column (11) and the second battery (20) is b, and a/b is more than or equal to 2.5 and less than or equal to 10.

2. The battery according to claim 1, characterized in that the polar post (11) is provided on a first large surface (12) of the first cell (10), the recess (21) being provided on a second large surface (22) of the second cell (20);

wherein the first direction is perpendicular to the first large surface (12) and the second large surface (22).

3. The battery pack according to claim 1, wherein the second battery (20) comprises a battery housing (23), the recess (21) is provided on the battery housing (23), a maximum distance between the battery housing (23) and a side of the pole (11) facing the recess (21) is a, and a minimum distance between the pole (11) and the battery housing (23) is b.

4. The battery according to claim 1, wherein the capacity of the first cell (10) is equal to or greater than 100ah,3 equal to or greater than a/b equal to or less than 6.

5. The battery according to claim 1, wherein the first cell (10) comprises a plurality of stacked pole pieces, the number of pole pieces being equal to or greater than 50,3.5 equal to or less than a/b equal to or less than 7.

6. The battery according to claim 5, wherein the first cell (10) is a laminated cell.

7. The battery pack according to any one of claims 1 to 6, wherein the recess (21) is provided at an end of the second cell (20) in a length direction of the second cell (20).

8. The battery pack according to any one of claims 1 to 6, wherein the recess (21) is provided in a middle portion of the second cell (20) in a length direction of the second cell (20).

9. The battery according to any one of claims 1 to 6, characterized in that the pole (11) comprises:

-a first portion (111), said first portion (111) being arranged on said first battery (10);

-a second portion (112), said second portion (112) being connected to said first portion (111), and said second portion (112) extending from an end connected to said first portion (111) towards a direction approaching said second battery (20) such that an angle is formed between said second portion (112) and said first portion (111).

10. The battery according to claim 9, wherein the second portion (112) is perpendicular to the first portion (111).

11. The battery according to claim 9, characterized in that the maximum distance between the area where the second portion (112) is connected with the first portion (111) and the second cell (20) is a.

12. The battery according to any one of claims 1 to 6, wherein the first cell (10) and the second cell (20) are both quadrangular type cells.