CN217214958U

CN217214958U - Battery pack

Info

Publication number: CN217214958U
Application number: CN202220580376.4U
Authority: CN
Inventors: 谷亮杰; 关俊山; 刘炯; 颜廷露; 张勇杰
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-08-16
Anticipated expiration: 2032-03-16

Abstract

The utility model relates to a battery technology field provides a group battery. The battery pack includes: at least two batteries, wherein a surface of one or more batteries forms a depression; and at least part of the conductive piece is arranged in the sunken part, and the conductive piece and the sunken part are arranged in an insulating way. The battery pack comprises at least two batteries and a conductive piece, wherein a concave part is formed on the surface of one or more batteries. When the battery pack provided by the application is applied, at least part of the conductive piece can be placed in the concave part. It is worth noting that the conductive piece is arranged in the concave part and is insulated from the concave part, so that the short circuit phenomenon can be avoided, and the safety performance of the battery pack can be improved. Meanwhile, the partial conductive pieces arranged in the concave parts do not occupy the space in the battery pack independently, so that the space utilization rate in the battery pack is improved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a battery pack.

Background

Due to the limitations of the vehicle structure, the space for accommodating the battery pack is limited, which requires placing as many batteries as possible in the limited space of the battery box. Generally, a conductive member is connected to a battery in the battery pack, and the conductive member is connected to other structural members to collect a battery signal.

However, the conductive member needs to occupy a separate space inside the battery, which may crush the space of other devices, thereby resulting in a low space utilization inside the battery pack.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack to promote space utilization in the battery pack.

In order to achieve the above purpose, the utility model provides the following technical scheme:

the utility model provides a battery pack, include:

at least two batteries, wherein a surface of one or more batteries forms a depression;

and at least part of the conductive piece is arranged in the sunken part, and the conductive piece and the sunken part are arranged in an insulating way.

The battery pack comprises at least two batteries and a conductive piece, wherein a concave part is formed on the surface of one or more batteries. When the battery pack provided by the application is applied, at least part of the conductive piece can be placed in the concave part. It is worth noting that the conductive piece is arranged in the concave part and is insulated from the concave part, so that the short circuit phenomenon can be avoided, and the safety performance of the battery pack can be improved. Meanwhile, the partial conductive pieces arranged in the concave parts do not occupy the space in the battery pack independently, so that the space utilization rate in 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 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 structural diagram of a battery pack provided in an embodiment of the present application;

FIG. 2 is a schematic partially exploded view of the structure of FIG. 1;

FIG. 3 is a schematic, partially exploded view of the structure of FIG. 1;

fig. 4 is a schematic structural view of an end plate in a battery pack according to an embodiment of the present disclosure;

fig. 5 is a schematic view of another structure of an end plate in a battery pack according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a battery pack according to an embodiment of the present application.

The reference numerals are explained below:

100. a battery; 110. a recessed portion; 120. a flange structure; 200. a conductive member; 300. an end plate; 310. a first avoidance slot; 400. a battery case; 410. and a second avoidance groove.

Detailed Description

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

In the description of the present disclosure, unless otherwise explicitly specified or limited, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" object or "an" object is also intended to mean one of many such objects possible.

The terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, an electrical connection, or a signal connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood 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.

The embodiment of the application provides a battery pack. Fig. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application. Fig. 2 is an exploded view of a portion of the structure of fig. 1. As shown in fig. 1 and 2, the battery pack provided by the embodiment of the present application includes:

at least two batteries 100, wherein a surface of one or more batteries 100 forms a recess 110;

the conductive device 200, at least a portion of the conductive device 200 is disposed in the recess 110, and the conductive device 200 and the recess 110 are insulated from each other.

It should be noted that the battery pack provided in the embodiment of the present application includes at least two batteries 100 and a conductive device 200, wherein, along a stacking direction of at least two batteries 100, as shown in an arrow direction a in fig. 1 exemplarily, the conductive device 200 may be selected as a Flexible Printed Circuit (FPC), which may be modified specifically according to requirements and is not described herein again.

When the battery pack provided by the embodiment of the present application is applied, at least a portion of the conductive member 200 may be disposed in the recess 110. It should be noted that, since the conductive member 200 is disposed in the recess 110 and insulated from the recess 110, a short circuit phenomenon can be avoided, thereby improving the safety of the battery pack. Meanwhile, the partial conductive members 200 disposed in the recess 110 do not occupy the space in the battery pack alone, thereby improving the space utilization rate in the battery pack.

It is understood that the recess 110 may be formed by one or more batteries 100. Specifically, in one embodiment, the recess 110 is formed by one battery 100; in another embodiment, the recess 110 is formed by a plurality of batteries 100, and the recess 110 may be formed by two batteries 100. Of course, the battery pack provided in the embodiment of the present application may include the recess 110 formed by one battery 100 and the recesses 110 formed by matching a plurality of batteries 100, which may be specifically set according to requirements and are not described herein again.

It should be noted that, when the recess 110 is formed by one battery 100, the battery pack provided in the embodiment of the present application may include only one battery 100 provided with the recess 110, and in this case, the battery 100 may be disposed at any position along the direction a. Of course, the battery pack provided in the embodiment of the present application may further include a plurality of batteries 100 provided with the recess 110. Even, each battery 100 in the battery pack provided by the embodiment of the present application may be provided with the recess 110, and may be specifically set according to requirements.

It should be noted that, when the plurality of batteries 100 in the battery pack provided in the embodiment of the present application are all provided with the recessed portions 110, any one or more recessed portions 110 may be selectively selected to arrange the conductive members 200, so that the application scenarios of the battery pack provided in the embodiment of the present application may be widened.

For more clear explanation of the battery pack provided in the embodiments of the present application, an exemplary provision is: the thickness direction of the battery 100 is a direction a (i.e., stacking direction), the width direction of the battery 100 is a direction b, and the length direction of the battery 100 is a direction c, the direction a, the direction b, and the direction c being perpendicular to each other two by two. It should be understood that the structure shown in fig. 2 is formed after the conductive device 200 is exploded in the direction b.

It is noted that the recess 110 formed on the surface of the battery 100 may have various structures and positions. With continued reference to the structure shown in fig. 1 and 2, the following description will be made, by way of example, with the battery 100 at the outermost edge in the direction a provided with the recess 110.

In one embodiment, the battery 100 has four sides connected in series, and the recess 110 communicates with at least two adjacent sides of the battery 100.

It should be understood that the battery 100 generally has six sides, wherein the two sides are larger in area, forming the large sides of the battery 100. As shown in fig. 1, a plurality of cells 100 are stacked with their large faces in contact, forming a stacking direction a; the areas of the four surfaces are smaller and are connected in sequence to form an annular structure.

It should be noted that, in this embodiment, the recess 110 connects at least two adjacent sides of the battery 100, so that the conductive member 200 performs direction conversion through the recess 110.

Illustratively, as shown in the structure of fig. 2, the conductive device 200 has a portion extending along the direction a and a portion extending along the direction c, and the conductive device 200 has a bent portion connecting the two portions, the bent portion extending along the direction b; the battery 100 has a first side p1 and a second side p2, and the first side p1 is connected to one side of the second side p 2.

With continued reference to the structure shown in fig. 2, when the battery pack provided in the embodiment of the present application is applied, the bent portion of the conductive component 200 may be disposed in the recess 110 at the first side surface p1, and at the same time, the portion of the conductive component 200 extending along the direction c is disposed in the recess 110 of the second side surface p2, so as to prevent the conductive component 200 from occupying space alone. Meanwhile, the conductive members 200 may perform a commutation operation in the recess 110 at the first side p1 and the second side p 2.

In one embodiment, the recess 110 is a through structure. For example, with continued reference to the structure shown in fig. 2, the recess 110 has a through structure on both the first side p1 and the second side p 2. It should be noted that, the structural arrangement can facilitate the conductive elements 200 entering or exiting from the recess 110 from any position under different design requirements, thereby better improving the space utilization rate in the battery pack.

Of course, due to the design requirement of a BMS (battery management system), the conductive elements 200 may need to be arranged in different directions, so that the recessed portion 110 may be further arranged to communicate with other side surfaces and a large surface of the battery 100, so as to facilitate the conductive elements 200 to enter the recessed portion 110 and to be led out of the recessed portion 110 from any direction under different requirements, thereby further improving the application range of the battery pack provided by the embodiment of the present application. Illustratively, as shown in fig. 2, four sides of the battery 100 cooperate to form an annular recess 110.

In one embodiment, the conductive member 200 is engaged in the recess 110. It should be noted that the battery pack provided in the embodiment of the present application may be limited or fixed by the conductive element 200 disposed in the recess 110 through the recess 110, so that a separate positioning structure is not required to be disposed, thereby simplifying the complexity of the internal structure of the battery pack and reducing the assembly difficulty.

Of course, an auxiliary fixing structure may be disposed between the battery 100 and the conductive device 200 according to requirements, so as to further fix the battery 100 and the conductive device 200. For example, the auxiliary fixing structure may be a hook or an adhesive. Of course, the auxiliary fixing structure may also be other structures, and will not be described in detail herein.

In one embodiment, referring to the structure shown in fig. 2 and 3, the battery 100 includes a body portion and a flange structure 120, wherein the flange structure 120 is disposed on a side edge of the body portion and protrudes away from the body portion along the stacking direction a of at least two batteries 100;

the flange structure 120 cooperates with the body portion to form the recess 110.

Note that, in order to fix the adjacent cells 100, a flange structure 120 is formed on the side of the body portion of each cell 100. Illustratively, the flange structure 120 is a raised edge as shown in FIG. 2, and the raised edge projects away from the body portion. It is noted that the welding between the adjacent batteries 100 may be performed by a convex edge. When the battery pack provided by the embodiment of the present application is provided, a recess formed by the flange structure 120 and the body part being engaged with each other may be used as the recess 110.

The battery pack provided by the embodiment of the application forms the concave part 110 by using the body structure of the battery 100, and the concave part 110 does not need to be prepared independently, so that the preparation process can be simplified. Meanwhile, the conductive member 200 is disposed in the recess formed by the flange structure 120 and the body portion, so that the space utilization rate in the battery pack can be improved.

With continued reference to the structure shown in fig. 2 and 3, when the outermost cells 100 are provided with the recesses 110 in the stacking direction a of at least two cells 100, in one embodiment, the battery pack provided in the embodiment of the present application further includes end plates 300. Specifically, the end plate 300 is provided on the side of the cell 100 formed with the recess 110 facing away from the other cells 100 in the stacking direction of at least two cells 100. It is to be understood that the end plate 300 serves to fix or protect the plurality of cells 100.

In one embodiment, referring to the structure shown in fig. 2 and 3, the end plate 300 is provided with a first avoiding groove 310, and the first avoiding groove 310 is communicated with the recess 110 to accommodate the conductive member 200.

It should be noted that, on the one hand, the first avoiding groove 310 and the recess 110 cooperate to accommodate the conductive device 200, and the dimension of the conductive device 200 along the stacking direction a can be designed to be larger for better signal transmission. On the other hand, after the size of the conductive member 200 in the direction a is determined, the size of the recess at the battery 100 may be set to be smaller, so that the structure of the body of the battery 100 may be adapted.

In addition, when a plurality of cells 100 form a battery pack, which requires an overpressure, the first escape groove 310 of the end plate 300 may give a buffering gap to prevent the conductive member 200 from being damaged by being pressed.

Fig. 4 is a schematic structural diagram of an end plate 300 according to an embodiment of the present disclosure. Taking the structure of fig. 4 as an example, in one embodiment, the end plate 300 is a plate-like structure having six surfaces. Specifically, the end plate 300 includes a large surface M and a large surface N having a large area. It should be understood that the "large surface" means a surface having a large area relative to the other four surfaces, and the large surface M is disposed opposite to the large surface N. When the end plate 300 is applied, one large face of the end plate 300 is disposed toward the large face of the battery 100. Illustratively, the large face M of the end plate 300 faces the battery 100 as shown in fig. 3.

With continued reference to the structure shown in fig. 4, the end plate 300 includes a first side surface S1 and a first side surface S2 disposed oppositely, and a first side surface S3 and a first side surface S4 disposed oppositely, wherein the first side surface S1, the first side surface S3, the first side surface S2, and the first side surface S4 are connected in sequence and form a ring structure.

In a specific embodiment, the first avoidance groove 310 is a through groove, and an extending direction of the through groove is perpendicular to the stacking direction a of the at least two batteries 100. For example, referring to the structure shown in fig. 3 in conjunction with fig. 4, the opening of the first avoiding groove 310 is located on the large surface M, and the first avoiding groove 310 penetrates the third side S3 and the fourth side S4.

It should be noted that, the structure of the through groove may facilitate the assembly of the end plate 300 with the conductive member 200 and the battery 100, so as to improve the assembly efficiency.

In another specific embodiment, the first escape groove 310 extends from the opposite side of the end plate 300 from the cell 100 to the outer edge of the opposite side. Illustratively, as shown in fig. 5, the openings of the first avoidance groove 310 are located at the large surface M and the first side surface S1, and the first avoidance groove 310 penetrates the third side surface S3 and the fourth side surface S4. It should be noted that, this structural design can further improve the assembly efficiency.

Specifically, in this embodiment, the mounting and dismounting operations of the conductive member 200 can be performed from the opening of the first avoidance groove 310 at the first side surface S1. for example, with continuing reference to the structure shown in fig. 3, after the battery 100 is assembled with the end plate 300, the conductive member 200 can be placed in the first avoidance groove 310 and the recess 110 along the direction b.

A specific structural description will now be provided for a clearer understanding of the battery pack provided in the embodiments of the present application. With continued reference to the structure shown in fig. 3, a plurality of cells 100 are stacked along a direction a, which is a length direction of the cells 100, and a direction c, which is a width direction.

For example, referring to the structure shown in fig. 2, a plurality of cells 100 are stacked, and each cell 100 has first and second electrode terminals with opposite polarities. Wherein, the first electrode terminal is arranged at the first side p1 of the battery 100, and the second electrode terminal is arranged at the side opposite to the first side p 1; a plurality of first electrode terminals are connected to the same conductive member 200, and a plurality of second electrode terminals are connected to another conductive member 200.

Due to layout requirements, the conductive members 200 located at the first side surface side may need to be laid out in other directions in order to be connected with an external structure. For example, as shown in fig. 3, the conductive member 200 may cross the width direction of the battery 100. At this time, the partial conductive members 200 disposed in the recess 110 do not occupy the space in the battery case 400 alone, so that the space can be saved and the space utilization rate of the battery pack can be improved.

In one embodiment, the end plate 300 is provided with a connection part connecting the end plate 300 and the conductive member 200. It should be noted that the connection part may enhance the stability of the connection relationship between the end plate 300 and the conductive member 200, and prevent the conductive member 200 from coming out of the recess 110 or the first escape groove 310, thereby improving the safety of the battery pack.

It should be noted that the connecting portion has various structures, and for example, a hook may be provided on the end plate 300 to fix the conductive member 200 to the end plate 300. Or, a hot-melt column structure may be adopted for fixing, specifically, a positioning hole may be provided on the FPC, and after the hot-melt column at the position corresponding to the end plate 300 passes through the positioning hole, the form of the passing end of the hot-melt column is changed to form a limiting structure. Alternatively, the fixing may be performed in the form of bonding to simplify the overall structure.

Of course, any combination of bonding, clamping or riveting may be used to fix the conductive device 200 and the end plate 300, so as to improve the stability of the two after assembly, which is not described herein again.

In one embodiment, an insulating structure may be provided on the inner wall of the first escape groove 310 of the end plate 300 and/or the conductive member 200. Illustratively, the insulating structure may be one or more of an insulating coating, an insulating film, or an insulating tape.

In another embodiment, the end plate 300 is made of an insulating material. It is to be understood that the end plate 300 may be partially or entirely made of an insulating material. When the end plate 300 is entirely made of an insulating material, the insulating property between the end plate 300 and the conductive member 200 may be better improved, and at the same time, the end plate 300 may also serve as an insulating plate to insulate the battery 100 from the battery case 400.

Illustratively, when the end plate 300 is made of an insulating material, the insulating material may be selected from one or more of PC (polycarbonate), or PP (polypropylene), or a composite material of PC and ABS (acrylonitrile butadiene styrene copolymer).

In one embodiment, as shown in fig. 6, the battery pack further includes a battery case 400, the battery 100 is disposed in the battery case 400, a second avoiding groove 410 is formed on a side of the battery case 400 facing the battery 100, and the second avoiding groove 410 is communicated with the recess 110 to accommodate the conductive member 200.

It should be noted that, with continuing reference to the structure shown in fig. 6, on the one hand, the second avoiding groove 410 and the recess 110 cooperate to accommodate the conductive device 200, and the dimension of the conductive device 200 along the stacking direction a can be designed to be larger for better signal transmission. On the other hand, when the size of the conductive member 200 in the direction a is determined, the size of the recess at the battery 100 may be set to be smaller, so that the structural arrangement of the battery 100 itself may be adapted.

In addition, when a plurality of batteries 100 form a battery pack, which requires an overpressure, the first escape groove 310 of the battery case 400 may give a buffering gap to prevent the conductive member 200 from being damaged by being pressed.

Of course, a fixing structure may be provided at the case, and the fixing structure may enhance the stability of the connection relationship between the battery case 400 and the conductive member 200, and prevent the conductive member 200 from coming off from the recess 110 or the second avoidance groove 410, thereby improving the safety of the battery pack.

It should be understood that in the battery pack provided in the embodiment of the present application, the positional relationship between the battery 100 and the battery case 400 is not limited to the ones shown in fig. 6, and an end plate 300 may be further provided between the battery 100 and the battery case 400. When in use, the avoidance grooves matched with the concave portions 110 may be disposed on the battery box 400 and the end plate 300 according to requirements, and detailed description is omitted.

In one embodiment, the battery pack may be a battery module or a battery pack.

The battery module includes a plurality of batteries 100, wherein the plurality of batteries 100 are stacked, and end plates 300 and side plates are used to fix the plurality of batteries 100.

The battery pack includes a plurality of batteries 100 and a battery case 400, the battery case 400 is used to fix the plurality of batteries 100, and an end plate 300 may be provided between the batteries 100 and the battery case 400.

It should be noted that the battery pack includes a plurality of batteries 100, and the plurality of batteries 100 are disposed in the case. The plurality of batteries 100 may be mounted in the case after forming a battery module, and at this time, the battery module may include an end plate 300 and a side plate for fixing the plurality of batteries 100. Alternatively, the plurality of batteries 100 may be directly disposed in the case, that is, the plurality of batteries 100 need not be grouped, and in this case, the end plate 300 may be disposed between the batteries 100 and the battery case 400.

The battery 100 includes a cell 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 stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first electrode and the second electrode can be interchanged.

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 present disclosure is limited only by the appended claims.

Claims

1. A battery pack, comprising:

at least two batteries (100), wherein a surface of one or more batteries (100) forms a recess (110);

the conductive piece (200), at least part of the conductive piece (200) is arranged in the concave part (110), and the conductive piece (200) and the concave part (110) are arranged in an insulating way.

2. The battery pack according to claim 1, wherein the recess (110) is formed by one of the cells (100).

3. The battery pack according to claim 2, wherein the battery (100) has four sides connected in series, and the recess (110) communicates with at least two adjacent sides of the battery (100).

4. The battery pack according to claim 3, wherein the battery (100) comprises a body portion and a flange structure (120), the flange structure (120) being provided at a side edge of the body portion in a stacking direction of at least two batteries (100) and protruding away from the body portion;

the flange structure (120) cooperates with the body portion to form the recess (110).

5. The battery pack according to any one of claims 1 to 4, wherein at least two of the cells (100) are stacked, and the outermost cell (100) is provided with the recess (110) in the stacking direction of at least two of the cells (100).

6. The battery pack according to claim 5, further comprising an end plate (300), wherein the end plate (300) is provided on a side of the cell (100) formed with the depression (110) facing away from the other cells (100) in a stacking direction of at least two cells (100).

7. The battery pack according to claim 6, wherein the end plate (300) is provided with a first escape groove (310), the first escape groove (310) communicating with the recess (110) to receive the conductive member (200).

8. The battery pack according to claim 7, wherein the first avoidance groove (310) is a through groove, and an extending direction of the through groove is perpendicular to a stacking direction of at least two of the batteries (100).

9. The battery pack according to claim 8, wherein the first avoidance groove (310) extends from the opposite side of the end plate (300) to the outer edge of the opposite side from the cell (100).

10. The battery pack according to claim 6, wherein the end plate (300) is provided with a connecting portion connecting the end plate (300) and the conductive member (200).

11. The battery according to claim 6, characterized in that the end plate (300) is made of an insulating material.

12. The battery pack according to claim 5, further comprising a battery case (400), wherein the battery (100) is disposed in the battery case (400), a second avoiding groove (410) is formed in one side of the battery case (400) facing the battery (100), and the second avoiding groove (410) is communicated with the recess (110) to accommodate the conductive member (200).