CN217589282U

CN217589282U - Battery pack

Info

Publication number: CN217589282U
Application number: CN202221654206.2U
Authority: CN
Inventors: 许久凌; 刘瑞见; 张璐璐
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-10-14
Anticipated expiration: 2032-06-28

Abstract

The utility model relates to a battery technology field provides a battery pack, include: a battery case; the battery is arranged in the battery box body and is provided with a recess; and the battery is connected with the battery box body through the connecting structure, and at least part of the connecting structure is positioned in the recess. The battery is fixedly connected with the battery box body through a connecting structure. Through being formed with sunken on the battery to connection structure's at least part is located sunken, thereby can improve connection stability of connection structure and battery, after connection structure realized reliably being connected with the battery box, can guarantee that the battery is fixed in the battery box steadily, with the safety in utilization nature who improves the battery package.

Description

Battery pack

Technical Field

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

Background

In the related art, the battery inside the battery pack is fixedly connected with the battery box body, and the problem of looseness and the like easily occurs in connection between the battery and the battery box body due to limitation of a battery structure.

SUMMERY OF THE UTILITY MODEL

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

The utility model provides a battery pack, include:

a battery case;

the battery is arranged in the battery box body and is provided with a recess;

and the battery is connected with the battery box body through the connecting structure, and at least part of the connecting structure is positioned in the recess.

The utility model discloses battery package includes battery box, battery and connection structure, and the battery passes through connection structure and battery box fixed connection. Through being formed with sunken on the battery to connection structure's at least part is located sunken, thereby can improve connection structure and battery's stability of being connected, after connection structure realized reliably being connected with the battery box, can guarantee that the battery is fixed in the battery box steadily, with the safety in service performance who improves the battery package.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may be arranged differently as is known in the art. Further, in the drawings, like reference characters designate the same or similar parts throughout the several views. Wherein:

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

fig. 2 is a schematic view showing the structure of a battery according to the first exemplary embodiment;

fig. 3 is a schematic view showing the structure of a battery according to a second exemplary embodiment;

fig. 4 is a schematic structural view showing a battery according to a third exemplary embodiment.

The reference numerals are explained below:

10. a battery case; 20. a battery; 21. recessing; 22. a first surface; 23. a second surface; 24. a battery case; 25. an electric core; 30. and (4) a connecting structure.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is, therefore, to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, unless explicitly specified or limited otherwise, 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; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and encompass, for example, a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood by those skilled in the art as the case may be.

Further, in the description of the present disclosure, it is to be understood that the directional words "upper", "lower", "inner", "outer", etc., which are described in the exemplary embodiments of the present disclosure, are described at the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present disclosure. It will also be understood that, in this context, when an element or feature is referred to as being "on", "under", or "inner", "outer" with respect to another element(s), it can be directly on "," under ", or" inner "," outer "with respect to the other element(s), or indirectly on", "under", or "inner", "outer" with respect to the other element(s) via intervening elements.

An embodiment of the present invention provides a battery pack, please refer to fig. 1 to 4, the battery pack includes: a battery case 10; a battery 20, wherein the battery 20 is arranged on the battery box body 10, and the battery 20 is provided with a recess 21; and the connecting structure 30 is used for connecting the battery 20 with the battery box body 10 through the connecting structure 30, and at least part of the connecting structure 30 is positioned in the recess 21.

The utility model discloses a battery package of an embodiment includes battery box 10, battery 20 and connection structure 30, and battery 20 passes through connection structure 30 and battery box 10 fixed connection. By forming the recess 21 on the battery 20 and locating at least part of the connection structure 30 in the recess 21, the connection stability of the connection structure 30 and the battery 20 can be improved, and after the connection structure 30 is reliably connected with the battery case 10, the battery 20 can be ensured to be stably fixed to the battery case 10, so as to improve the safety use performance of the battery pack.

It should be noted that, considering the structural characteristics of the battery 20 itself and the structural change characteristics during use, the problems to be considered when the battery 20 is connected to an external structure are relatively large, and for example, the connection between the battery and another structure cannot be affected, for example, the series-parallel connection between two adjacent batteries 20, or the expansion of the battery during use needs to be considered, so that the fixing requirement for the battery 20 and the external structure is large, and the problem of poor connection stability of the battery 20 is likely to occur. The battery box 10 has simple structure and relatively low connection requirement. In this embodiment, through being formed with sunken 21 at the surface of battery 20, and make at least part of connection structure 30 be located sunken 21, thereby can guarantee that connection structure 30 and battery 20 have sufficient connection area, with this reliable connection who realizes connection structure 30 and battery 20, and it is lower to follow-up connection requirement to connection structure 30 and battery box 10, and do not exclude to carry out other connection processing to battery box 10, with this stable connection who guarantees connection structure 30 and battery box 10, thereby can guarantee that battery 20 is fixed in battery box 10 steadily, further guarantee that battery package even the appearance rocks the scheduling problem, battery 20 is difficult for appearing not hard up yet, thereby improve battery package's safety in service performance.

In one embodiment, the connection structure 30 may be a snap-fit structure, for example, a portion of the connection structure 30 is snap-fit to the battery 20, and another portion of the connection structure 30 is snap-fit to the battery box 10, so as to ensure that the battery 20 is stably fixed to the battery box 10.

In one embodiment, the connection structure 30 may be a combination of a clamping structure and a fixing component, for example, the clamping structure of the connection structure 30 is clamped with the battery 20, the fixing component of the connection structure 30 is connected with the battery case 10, and the fixing component may include a fastener, for example, a bolt, a screw, or a key.

In one embodiment, the connection structure 30 includes a glue layer, i.e., at least a portion of the glue layer can be located in the recess 21 of the battery 20 to ensure a reliable connection of the glue layer with the battery 20, and the battery 20 is bonded to the battery case 10 through the glue layer to ensure a reliable fixation of the battery 20 to the battery case 10. The adhesive layer may be an adhesive in the related art, which is used to achieve the fixed connection of the battery 20 and the battery case 10.

In one embodiment, the thermal conductivity of the adhesive layer may be 0.5w/mk to 10w/mk, and on the basis of the reliable connection between the battery 20 and the battery case 10 achieved through the adhesive layer, the battery 20 may also be enabled to rapidly transfer heat to the battery case 10 through the adhesive layer, so as to achieve rapid heat transfer of the battery 20.

The thermal conductivity of the glue layer may be 0.5w/mk, 0.6w/mk, 0.7w/mk, 0.8w/mk, 1w/mk, 1.2w/mk, 1.5w/mk, 1.6w/mk, 1.7w/mk, 1.8w/mk, 2w/mk, 2.2w/mk, 2.5w/mk, 3w/mk, 4w/mk, 5w/mk, 6w/mk, 6.5w/mk, 7w/mk, 8w/mk, 8.5w/mk, 9w/mk, 9.5w/mk, 9.8w/mk, 9.9w/mk, or 10w/mk, and so forth.

In one embodiment, the adhesive layer is a heat-conducting adhesive, and at least a portion of the heat-conducting adhesive can be located in the recess 21 of the battery 20, so as to ensure reliable connection between the heat-conducting adhesive and the battery 20, and the battery 20 is connected to the battery case 10 through the heat-conducting adhesive, which not only ensures reliable fixation of the battery 20 to the battery case 10, but also ensures reliable heat dissipation of the battery 20 through the heat-conducting adhesive of the battery 20, thereby increasing safety performance of the battery 20.

In one embodiment, as shown in fig. 2 and 3, the battery 20 includes two opposing first surfaces 22 and four second surfaces 23 disposed around the first surfaces 22, the recesses 21 being formed in the second surfaces 23; wherein, the area of first surface 22 is greater than the area of second surface 23, on the basis that sunken 21 can not occupy the too much inner space of battery 20, can guarantee that battery 20 passes through connection structure 30 and realizes fixing with battery box 10 to when battery 20 is in groups, can make the relative setting of first surface 22 of adjacent battery 20, with this improve the battery and become ganged space utilization, thereby guarantee the energy density of battery.

In one embodiment, the recess 21 intersects with the two first surfaces 22 and the two opposite second surfaces 23 simultaneously, which not only is simple in structure and convenient to form, but also facilitates the connection between the connection structure 30 and the recess 21, thereby ensuring the installation stability of the battery 20.

In one embodiment, the second surface 23 on which the recess 21 is formed is a curved surface, that is, the surface of the recess 21 is a curved surface, so that on the basis of ensuring that the wall surface of the recess 21 has a reliable area, stress concentration can be prevented from being locally formed on the recess 21, thereby improving the structural strength of the battery 20 and preventing the battery 20 from being damaged.

In one embodiment, the second surface 23 on which the recess 21 is formed is an arc surface, so that the wall surface of the recess 21 is smooth, the formation of the recess 21 is facilitated, the molding efficiency of the battery 20 can be ensured, the manufacturing efficiency of the battery 20 can be improved, and the stress can be further dispersed by the arc surface on the wall surface of the recess 21, so that the structural strength of the battery 20 can be improved, and the safety performance of the battery can be improved.

In one embodiment, the areas of the two opposite first surfaces 22 are not the same, that is, in the process of forming the recess 21, a portion of one first surface 22 may be occupied, so as to facilitate the formation of the recess 21, and the requirement for arrangement of the internal space of the battery 20 may be met, thereby utilizing the space of the battery 20 to the maximum extent.

It should be noted that the two opposite first surfaces 22 are large surfaces of the battery 20, the four second surfaces 23 are small surfaces of the battery 20, the four second surfaces 23 include two pairs of small surfaces, i.e., a first pair of small surfaces extending along the length direction of the battery 20, and a second pair of small surfaces extending along the width direction of the battery 20, and the area of the first pair of small surfaces is larger than that of the second pair of small surfaces, but smaller than that of the large surfaces.

In one embodiment, the recess 21 is disposed toward the top surface of the battery case 10, i.e., the battery 20 may be connected to the top surface of the battery case 10 by the connection structure 30, the top surface of the battery case 10 may be formed by a cover plate of the battery case 10, or the top surface of the battery case 10 may be formed by a heat exchange structure of the battery case 10.

In one embodiment, the recess 21 is disposed toward a side of the battery case 10, i.e., the battery 20 may be connected with the side of the battery case 10 by the connection structure 30, and the side of the battery case 10 may be formed by a frame of the battery case 10.

In one embodiment, as shown in fig. 1, the recess 21 is disposed toward the bottom surface of the battery housing 10, and the battery 20 is connected to the bottom surface of the battery housing 10 through the connection structure 30, so that the connection between the battery 20 and the battery housing 10 can be completed during the grouping of the battery 20, thereby improving the mounting accuracy of the battery 20. The bottom surface of the battery case 10 may be formed by the heat exchange structure of the battery case 10, or the bottom surface of the battery case 10 may be formed by the bottom plate of the battery case 10.

In one embodiment, as shown in fig. 2, the opposite sides of the battery 20 are formed with the recesses 21, so that the opposite sides of the battery 20 can be fixedly connected with the battery box 10 through the connecting structure 30, or one recess 21 is fixedly connected with the battery box 10 through the connecting structure 30, and the other recess 21 can be used as an avoiding structure, so as to avoid the interference between other structures and the battery 20, for example, a pole assembly can be arranged in the other recess 21, so as to be used for series connection or parallel connection between the batteries.

In one embodiment, as shown in fig. 3 and 4, a recess 21 may be formed at one side of the battery 20, the recess 21 is fixedly coupled to the battery case 10 by the coupling structure 30, and a side opposite to the recess 21 may be a flat surface.

In one embodiment, as shown in fig. 2 to 4, the battery 20 includes a battery housing 24 and a battery core 25, the battery core 25 is disposed in the battery housing 24, and the battery housing 24 is formed with a recess 21, that is, the recess 21 may be formed during the molding process of the battery housing 24, so as to be used for the subsequent fixed connection of the battery 20 and the battery box 10. The depth of the recess 21 may gradually decrease from the middle thereof to both sides, or the depth of the recess 21 may gradually decrease from one side to the other.

The outer surface of the battery case 24 may be covered with an insulating film or the like, in which case, the insulating film or the like may cover the recess 21, or the insulating film or the like may not cover the recess 21, so long as at least a portion of the connection structure 30 can be accommodated in the recess 21 to be fixedly connected to the battery case 10.

It should be noted that the battery 20 may be a laminated battery, which is not only convenient for grouping, but also can be processed to obtain a battery with a longer length.

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

Specifically, the battery cell 25 is a laminated battery cell, and the battery cell 25 has a first pole piece, a second pole piece opposite to the first pole piece in electrical property, and a diaphragm arranged between the first pole piece and the second pole piece, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

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

In one embodiment, the battery cell 25 may include a battery cell main body and two electrode ear portions, the two electrode ear portions may be respectively located at two opposite sides of the battery cell main body, one electrode ear portion extends from one side surface of the battery cell main body along a first direction, the other electrode ear portion extends from the other side surface of the battery cell main body along a second direction, and the first direction and the second direction are opposite. Alternatively, the two pole ear portions may extend from the same side of the cell body.

The battery cell main body comprises more than two pole pieces, the pole lug part comprises more than two single-piece pole lugs, the single-piece pole lugs extend out from the pole pieces corresponding to the single-piece pole lugs respectively, the width of each single-piece pole lug can be smaller than that of each pole piece, and a plurality of single-piece pole lugs are stacked to form the pole lug part and connected with the electrode leading-out structure. Wherein the single tab is made of a metal foil having good electrical and thermal conductivity, such as aluminum, copper, nickel, or the like.

In one embodiment, both of the tab portions of the battery cell 25 may be electrically connected to the battery case 24, and in this case, the battery case 24 includes at least two portions that are insulated from each other, and the two portions are conveniently electrically connected to the two tab portions.

In one embodiment, the battery further includes a pole assembly, the pole assembly is disposed in the battery housing 24, the pole ear portion can be connected to the pole assembly, the number of the pole assemblies is two, the two pole assemblies are respectively a positive pole assembly and a negative pole assembly, each pole assembly can include two poles for increasing the overcurrent capacity of the battery, the number of the pole ear portions is also two, the two pole ear portions are respectively a positive pole ear and a negative pole ear, the positive pole assembly is connected to the positive pole ear, and the negative pole assembly is connected to the negative pole ear.

The battery case 24 may be made of stainless steel or aluminum, and has good corrosion resistance and sufficient strength.

In one embodiment, as shown in connection with fig. 1, the battery pack includes a plurality of batteries 20, and the plurality of batteries 20 are coupled within a battery case 10. Each of the batteries 20 may be connected to the battery case 10 by the connection structure 30.

The plurality of batteries 20 may be formed into a battery module and then disposed in the battery case 10, and the plurality of batteries 20 may be fixed by end plates and side plates. The plurality of cells 20 may be directly disposed in the cell case 10, i.e., without grouping the plurality of cells 20, and at this 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 invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

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

Claims

1. A battery pack, comprising:

a battery case (10);

a battery (20), wherein the battery (20) is arranged on the battery box body (10), and a recess (21) is formed in the battery (20);

the battery (20) is connected with the battery box body (10) through the connecting structure (30), and at least part of the connecting structure (30) is positioned in the recess (21).

2. The battery pack according to claim 1, wherein the connection structure (30) comprises a glue layer.

3. The battery pack of claim 2, wherein the adhesive layer has a thermal conductivity of 0.5w/mk to 10w/mk.

4. A battery pack according to claim 1, wherein the battery (20) comprises two opposite first surfaces (22) and four second surfaces (23) arranged around the first surfaces (22), the recess (21) being formed in the second surfaces (23);

wherein the area of the first surface (22) is larger than the area of the second surface (23).

5. Battery pack according to claim 4, characterized in that the recess (21) intersects both the first surfaces (22) and the second, opposite surfaces (23) at the same time.

6. The battery pack according to claim 5, wherein the second surface (23) formed with the recess (21) is a curved surface.

7. The battery pack according to claim 6, wherein the second surface (23) in which the depression (21) is formed is a circular arc surface.

8. A battery pack according to claim 4, wherein the first surfaces (22) of opposite sides do not coincide in area.

9. The battery pack according to any one of claims 1 to 8, wherein the recess (21) is provided toward the bottom surface of the battery case (10), and the battery (20) is connected to the bottom surface of the battery case (10) through the connection structure (30).

10. A battery pack according to claim 9, wherein the recess (21) is formed on both opposite sides of the battery (20).

11. The battery pack according to claim 9, wherein the battery (20) includes a battery case (24) and a cell (25), the cell (25) being disposed within the battery case (24), the battery case (24) being formed with the recess (21).