CN219226393U

CN219226393U - Battery pack

Info

Publication number: CN219226393U
Application number: CN202320176572.XU
Authority: CN
Inventors: 史艳艳; 李潘; 章炎华
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2023-02-06
Filing date: 2023-02-06
Publication date: 2023-06-20
Anticipated expiration: 2033-02-06

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack. The battery pack includes: a bottom plate; the heat exchange plate is in heat conduction contact with the output electric conduction row to form an electric conduction heat exchange row assembly, and the electric conduction heat exchange row assembly is at least partially perpendicular to the bottom plate. The battery pack can solve the heat exchange problem of the output conductive bars, can effectively fix the output conductive bars, and can save space and improve the space utilization rate 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

When the battery pack is charged and discharged at a high rate, the current flowing through the output conductive bar is large, and the design of the output conductive bar is often required to design a large enough current cross section area to meet the current flowing requirement, so that the technical problem that the output conductive bar is serious in heating due to insufficient current cross section area and the current carrying capacity is reduced is avoided. However, when the output conductive bars are arranged to have a larger overcurrent area, the overall weight of the battery pack can be increased, so that the overall energy density of the battery pack is reduced, and the lightweight design goal of the power battery pack is not facilitated.

Therefore, how to effectively cope with the problem of severe heat generation of the output conductive bars due to overcurrent is a technical problem to be solved.

Disclosure of Invention

The utility model provides a battery pack which can solve the heat exchange problem of an output conducting bar, can effectively fix the output conducting bar, and can even save space and improve the space utilization rate of the battery pack.

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

according to a first aspect of the present utility model, there is provided a battery pack comprising:

a bottom plate;

the heat exchange plate is in heat conduction contact with the output electric conduction row to form an electric conduction heat exchange row assembly, and the electric conduction heat exchange row assembly is at least partially perpendicular to the bottom plate.

The battery package that this application provided will heat the board and output electric conduction row form electrically conductive heat exchange row subassembly, in the use, the output electric conduction row can produce heat, and the heat exchange board that carries out heat conduction contact with the output electric conduction row can in time carry out the heat exchange with the output electric conduction row to reduce the excessive current heating problem of output electric conduction row under the heavy current condition, satisfy battery package lightweight design target.

When carrying out fixed operation to the conductive heat exchange row subassembly in the battery package that this application provided, with heat exchange plate with export conductive row fixed together can, can reduce the installation degree of difficulty, promote assembly efficiency to and, can promote the stability of structure between heat exchange plate and the output conductive row. In the battery pack provided by the application, the heat exchange plate and the conductive heat exchange row component formed by the output conductive row are at least partially perpendicular to the bottom plate, so that the occupied volume of the output conductive row in the horizontal direction can be saved, and the space utilization rate of the battery pack in the height direction is improved.

Drawings

For a better understanding of the present application, 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 application. 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 structural diagram of a battery pack according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a portion of the structure of FIG. 1;

FIG. 3 is a schematic view of a portion of the structure of FIG. 1 at another angle;

FIG. 4 is an enlarged schematic view of a part of the structure of FIG. 3;

fig. 5 is a schematic diagram illustrating an assembly of a conductive heat exchange bank assembly and a fixing portion in a battery pack according to an embodiment of the present application;

fig. 6 is a schematic diagram illustrating still another assembly of the conductive heat exchange bank assembly and the fixing portion in the battery pack according to the embodiment of the present application.

The reference numerals are explained as follows:

100. a case; 110. a bottom plate; 120. a fixing part; 130. an annular frame; 200. a conductive heat exchange bar assembly; 210. an output conductive bar; 220. a heat exchange plate; 300. a thermal insulation layer; 400. an insulating heat conducting adhesive layer; A. a groove.

Detailed Description

The technical solutions in the exemplary embodiments of the present application will be clearly and completely described below with reference to the drawings in the exemplary embodiments of the present application. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present application, 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 application.

In the description of the present application, 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/" 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 application can be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, which are described in the exemplary embodiments of the present application, are described with the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present application. 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 application provides a battery pack. Referring to the structure shown in fig. 1 to 4, a battery pack provided in an embodiment of the present application includes:

a base plate 110;

the output electric conduction row 210 and the heat exchange plate 220, the output electric conduction row 210 and the heat exchange plate 220 are arranged on one side of the bottom plate 110, the heat exchange plate 220 is in heat conduction contact with the output electric conduction row 210 to form the electric conduction heat exchange row assembly 200, and at least part of the electric conduction heat exchange row assembly 200 is vertical to the bottom plate 110.

It is understood that "thermally conductive contact" includes indirect heat exchange contact and direct heat exchange contact. The heat exchange plate 220 performs heat exchange with the output conductive bar 210, specifically, the heat exchange plate 220 may cool the output conductive bar 210, and of course, the heat exchange plate 220 may also heat the output conductive bar 210, which is not described in detail.

The battery pack provided by the embodiment of the application forms the conductive heat exchange assembly 200 by the heat exchange plate 220 and the output conductive bar 210, and in the use process, the output conductive bar 210 generates heat, and the heat exchange plate 220 in heat conduction contact with the output conductive bar 210 can timely perform heat exchange with the output conductive bar 210, so that the overcurrent heating problem of the output conductive bar 210 under the condition of heavy current is reduced, and the lightweight design goal of the battery pack is met.

When the conductive heat exchange bar assembly 200 in the battery pack provided by the embodiment of the application is fixed, the heat exchange plate 220 and the output conductive bar 210 are fixed together, so that the installation difficulty can be reduced, the assembly efficiency can be improved, and the stability of the structure between the heat exchange plate 220 and the output conductive bar 210 can be improved. The conductive heat exchange assembly 200 formed by the heat exchange plate 220 and the output conductive bar 210 in the battery pack is at least partially perpendicular to the bottom plate 110, so that the occupied volume of the output conductive bar 210 in the horizontal direction can be saved, and the space utilization rate of the battery pack in the height direction can be improved.

It should be appreciated that, in the battery pack provided by the embodiment of the present application, the conductive heat exchange row assembly 200 formed by the heat exchange plate 220 and the output conductive row 210 may also perform active cooling when the cross-sectional area of the output conductive row 210 is conservation (smaller thickness and width), so as to reduce the problem of excessive heat generated by the conductive row under the condition of large current, and meet the lightweight design goal of the battery pack.

With continued reference to the structure shown in fig. 1-4, the heat exchange plate 220 is filled with a cooling medium, and when the heat exchange plate 220 cools the output conductive strip 210, the cooling medium in the heat exchange plate 220 exchanges heat with the output conductive strip 210. Specifically, the higher temperature output conductor 210 dissipates heat and the cooling medium at the bottom absorbs heat.

It is noted that the output conductive bar 210 is connected to a battery pack or a battery module formed by a plurality of batteries in the battery pack, and the output conductive bar is connected to an output port of the battery pack. In the specific setting of the conductive heat exchange bar assembly 200 provided in the embodiments of the present application, the output conductive bar 210 is made of metal, such as copper and its alloy, and aluminum alloy, which are not described in detail.

In one embodiment, the heat exchange plate 220 is connected with the output conductive bars 210 in an insulating manner.

It should be noted that, since the output conductive bar 210 will be overcurrent, insulation connection needs to be performed between the heat exchange plate 220 and the output conductive bar 210, so as to avoid a short circuit between the heat exchange plate 220 and the output conductive bar 210, and improve the safety performance of the battery pack.

In a specific arrangement, the surface of the output conductive strip 210 and/or the heat exchange plate 220 may be provided with an insulating structure, where the insulating structure may be one or more of an insulating coating, an insulating film or an insulating tape, which is not described in detail.

In one embodiment, the base plate 110 is provided with a fixing portion 120, the fixing portion 120 is at least partially parallel to the conductive heat exchange bank assembly 200, and the fixing portion 120 fixes the conductive heat exchange bank assembly 200 in a parallel position.

When the fixing operation is performed, the heat exchange plate 220 and the output conductive bar 210 are directly installed on the fixing portion 120, so that the installation difficulty can be reduced, and the assembly efficiency can be improved.

It should be appreciated that since the fixing portion 120 and the conductive heat exchange bank assembly 200 are fixed by the parallel portions thereof, structural stability of the conductive heat exchange bank assembly 200 after being fixed can be improved.

In addition, it should be noted that, if the bottom plate 110 is used as the bottom, the side of the fixing portion 120 away from the bottom plate 110 is a "top surface", and the side close to the bottom plate 110 is a "bottom surface". In the arrangement direction perpendicular to the top surface and the bottom surface, the surface of the fixing portion 120 is used as a side surface, and the conductive heat exchange row assembly 200 can be placed on the side surface of the fixing portion 120, so that at least part of the conductive heat exchange row assembly 200 formed by the heat exchange plates 220 and the output conductive rows 210 in the battery pack is controlled to be perpendicular to the bottom plate 110, the occupied volume of the output conductive rows 210 in the horizontal direction is saved, and the space utilization rate of the battery pack in the height direction is improved.

In a specific arrangement, the fixing portion 120 may be a structure separately provided to the base plate 110, or the fixing portion 120 may be a self structure of the base plate 110.

In one embodiment, the fixing portion 120 is provided with a groove a, and the conductive heat exchanger bank assembly 200 is at least partially fixed in the groove a.

It should be noted that, by disposing the groove a on the fixing portion 120 and disposing the conductive heat exchange row assembly 200 at least partially in the groove a, the space occupied by the conductive heat exchange row assembly 200 in the box 100 can be reduced along the horizontal direction, thereby saving space and improving the space utilization in the box 100.

When the conductive heat exchange bank assembly 200 is specifically provided, it may be provided that: in the horizontal direction, the conductive heat exchange bank assembly 200 is partially or fully disposed within the recess a.

It should be noted that, when the conductive heat exchange bar assembly 200 is all disposed in the groove a, the conductive heat exchange bar assembly 200 is all accommodated in the groove a, and no space is occupied in the box 100, so that space can be better saved, and space utilization in the box 100 can be improved.

In one embodiment, referring to the structure shown in fig. 5, along the arrangement direction of the fixing portion 120 and the conductive heat exchange bank assembly 200, the depth D of the groove a is not greater than 2/3 of the thickness D of the fixing portion 120. It should be understood that the thickness of the fixing portion 120 at this time is one third of the thickness when the groove a is not provided.

It should be noted that, when the groove a is provided, the structural strength of the fixing portion 120 needs to be ensured, so that the oversized groove a is avoided, and the stability of the fixing portion 120 is damaged.

In one embodiment, the battery pack provided in the embodiments of the present application further includes a dividing beam, the dividing Liang Yongyi dividing the space within the battery pack into at least two subspaces; the dividing beam is a fixing portion 120.

It should be noted that, since the battery pack or the battery module is disposed on two sides of the fixing portion 120, a certain gap is formed between the fixing portion 120 and the battery pack or the battery module, and the conductive heat exchange bar assembly 200 is disposed on the fixing portion 120, so that the gap between the fixing portion 120 and the battery pack or the battery module can be effectively utilized, the occupied volume of the output conductive bar 210 in the horizontal direction is saved, and the space utilization of the battery pack in the height direction is improved.

It should be noted that the fixing portion 120 may enhance the structural strength of the case 100, and in addition, the fixing portion 120 may also serve as a bearing member in the battery pack.

When the fixing portion 120 is specifically provided, the fixing portion 120 may be a metal piece, such as an aluminum alloy, and of course, the fixing portion 120 may be provided as required to be made of other materials, which is not described in detail.

In one embodiment, please continue to refer to the structure shown in fig. 1 to 4, the battery pack provided in the embodiment of the present application further includes an annular frame 130, wherein:

the bottom plate 110 is buckled with an opening at one side of the annular frame 130;

the dividing beams divide the space within the annular rim 130.

It should be understood that the bottom plate 110, the annular rim 130, and the partition beams form the case 100 of the battery pack, wherein the partition beams partition the space within the annular rim 130 into different areas for placing the battery pack or the battery module; the annular rim 130 may be formed of a plurality of rim beams connected end to end in sequence, or the annular rim 130 may be a continuous complete structure.

In one embodiment, the conductive heat exchanger bank assembly 200:

the heat exchange plate 220 is fixed to a side surface of the fixing portion 120;

the output conductive bars 210 are fixed to a side of the heat exchange plate 220 facing away from the fixing portion 120.

The heat exchange plate 220 is disposed on the fixing portion 120 in the middle of the box 100, and the output conductive strip 210 is fixed on a side of the heat exchange plate 220 facing away from the fixing portion 120, so as to avoid contact between the output conductive strip 210 and the fixing portion 120, and the output conductive strip 210 and the surface of the heat exchange plate 220 are in tight heat-conducting contact with each other, so that the temperature of the output conductive strip 210 is reduced by the cooling medium in the heat exchange plate 220.

It should be noted that, the arrangement form can avoid the contact and short circuit between the output conductive bar 210 and the fixing portion 120, and can solve the insulation problem of the output conductive bar 210, so as to improve the safety performance of the battery pack; meanwhile, the installation and fixation problem of the conductive heat exchange row assembly 200 can be solved by the arrangement mode, the space is saved, and the space utilization rate is improved.

In one embodiment, along the arrangement direction of the fixing portion 120 and the conductive heat exchange bank assembly 200, grooves a are formed on both sides of the fixing portion 120;

the battery pack comprises at least two conductive heat exchange row assemblies 200, and each groove A is internally fixed with the conductive heat exchange row assemblies 200.

Illustratively, the fixing portion 120 may be made of an i-steel having a groove a on each side thereof, which may be used to fix the conductive heat exchange bank assembly 200.

It should be noted that, when the grooves a are formed on both sides of the fixing portion 120, the conductive heat exchange row assembly 200 can be selectively placed in any groove a, and the conductive heat exchange row assembly 200 can be further disposed in each groove a, so that the space occupied by the conductive heat exchange row assembly 200 in the box 100 is reduced along the horizontal direction, thereby saving space and improving the space utilization rate in the box 100.

It should be noted that, when the grooves a are formed on both sides of the dividing beam, the relationship between the thickness of the fixing portion 120 and the depth of the grooves a is considered. In one embodiment, the depth of the groove a on each side of the fixing portion 120 is not more than one third of the thickness of the fixing portion 120 (may be set to other values) to secure the structural strength of the fixing portion 120; in another embodiment, the grooves a on both sides of the fixing portion 120 are staggered along the extending direction of the fixing portion 120, so as to ensure the structural strength of the fixing portion 120.

In one embodiment, the conductive heat exchanger bank assembly 200 is bonded or snapped with the fixing portion 120.

It should be noted that, the bonding connection manner can improve the stability of the relative position between the conductive heat exchange bar assembly 200 and the fixing portion 120, and avoid the conductive cooling bar assembly from falling off from the fixing portion 120, so as to ensure the connection stability of the output conductive bar 210 and other structures; the connection mode of joint can reduce the assembly degree of difficulty, promotes assembly efficiency.

In the specific arrangement of the fixing structure between the conductive heat exchange bank assembly 200 and the fixing portion 120, the heat exchange plate 220 and the fixing portion 120 may be bonded by using a double sided tape, glue or adhesive tape; alternatively, the heat exchange plate 220 and the fixing portion 120 may be engaged with each other by a buckle, a clip, or the like.

In one embodiment, referring to the structure shown in fig. 5 and 6, a thermal insulation layer 300 is disposed between the conductive heat exchange bank assembly 200 and the fixing portion 120.

It should be noted that, the heat insulating layer 300 can avoid heat exchange between the conductive heat exchange assembly 200 and the fixing portion 120 (e.g. the heat exchange plate 220 and the fixing portion 120), so as to enhance the heat exchange effect between the heat exchange plate 220 and the output conductive strip 210, accelerate the temperature reduction of the output conductive strip 210, and further improve the use effect of the output conductive strip 210.

It should be noted that the heat insulating layer 300 may be a heat insulating glue layer, that is, the heat insulating layer 300 may have a heat insulating effect, and also may perform an adhesion effect to adhere the conductive heat exchange row assembly 200 and the fixing portion 120, so as to reduce the number of structural members in the battery pack and improve the space utilization of the battery pack.

In one embodiment, referring to the structure shown in fig. 4 to 6, the fixing portion 120 is provided with a first fixing surface;

the conductive heat exchange row assembly 200 is provided with a second fixing surface, the conductive heat exchange row assembly 200 is fixed on the first fixing surface through the second fixing surface, and the second fixing surface is matched with the first fixing surface in shape.

It should be understood that the first fixing surface and the second fixing surface are heat conductive contact surfaces of the heat exchange plate 220 and the fixing portion 120 in fig. 4-6, and are not shown by reference numerals.

For example, please continue to refer to the structure shown in fig. 5 and fig. 6, the first fixing surface is disposed on the groove a, the second fixing surface is disposed on the heat exchange plate 220, and the shape of the heat conducting contact surface of the first fixing surface and the second fixing surface is adapted, so that the stability of the conductive heat exchange assembly 200 in the groove a can be improved.

In a specific embodiment, referring to the structure shown in fig. 5, the bottom wall of the recess a is planar, and a side surface of the output conductive bar 210 facing the bottom wall of the recess a is also planar.

In another specific embodiment, the bottom wall of the groove a is curved, a side surface of the output conductive bar 210 facing the bottom wall of the groove a is also curved, and the curved surface of the output conductive bar 210 matches with the curved surface of the bottom wall of the groove a in shape.

In another specific embodiment, referring to the structure shown in fig. 6, the bottom wall of the groove a is of a concave-convex structure, a side surface of the output conductive bar 210 facing the bottom wall of the groove a is also of a concave-convex structure, and the concave-convex structure of the output conductive bar 210 is adapted to the concave-convex structure of the bottom wall of the groove a. Illustratively, as shown in fig. 6, in the heat-conducting contact surface between the groove a and the output conductive bar 210, a bottom wall portion area of the groove a is provided with a recess, and a protrusion is provided at a position of the output conductive bar 210 corresponding to the recess.

In one embodiment, please continue to refer to the structure shown in fig. 4 to 6, an insulating and heat conducting glue layer 400 is disposed between the heat exchange plate 220 and the output conductive row 210, and the heat exchange plate 220 and the output conductive row 210 are bonded by the insulating and heat conducting glue layer 400.

It should be noted that, the insulating and heat conducting glue layer 400 has a heat transfer function, so that the cooling effect of the heat exchange plate 220 on the output conductive strip 210 can be improved, so as to accelerate the cooling process of the output conductive strip 210, and further improve the use effect of the output conductive strip 210; meanwhile, the insulating and heat conducting glue layer 400 has an insulating function, and can insulate the heat exchange plate 220 and the output conductive bar 210, so that short circuit between the heat exchange plate 220 and the output conductive bar 210 is avoided, and the safety performance of the battery pack can be improved.

In one embodiment, the heat exchange plate 220 is a liquid inlet heat exchange plate 220 or a liquid outlet heat exchange plate 220.

It should be noted that, when the heat exchange plate 220 is the liquid inlet heat exchange plate 220, the temperature of the liquid inlet heat exchange plate 220 is lower, so that the cooling effect of the heat exchange plate 220 on the output conductive bar 210 can be ensured; when the heat exchange plate 220 is the liquid outlet heat exchange plate 220, the liquid outlet heat exchange plate 220 directly outputs the cooling medium after exchanging heat with the output conductive bar 210, so that the cooling effect of the whole cooling system on the battery is not affected.

Referring to the structures shown in fig. 1 and 2, when the heat exchange plate 220 is a liquid-outlet heat exchange plate 220, the liquid-outlet heat exchange plate 220 can form a rectangular cooling circuit with other heat exchange plate structures.

In addition, please note that, with continued reference to the structure shown in fig. 1 and 2, the box 100 of the battery pack is provided with a connection nozzle to effectively connect the liquid inlet heat exchange plate 220 and/or the liquid outlet heat exchange plate 220.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the application being indicated by the following claims. It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of protection of the application is limited only by the claims that follow.

Claims

1. A battery pack, comprising:

a bottom plate;

2. The battery pack of claim 1, wherein the heat exchange plates are in insulated connection with the output conductor bars.

3. The battery pack of claim 1, wherein the base plate is provided with a fixing portion, the fixing portion is at least partially parallel to the conductive heat exchange row assembly, and the fixing portion fixes the conductive heat exchange row assembly in a parallel position.

4. A battery pack as claimed in claim 3, wherein the fixing portion is provided with a recess, and the conductive heat exchange bank assembly is at least partially fixed in the recess.

5. The battery pack of claim 4, wherein the depth of the groove is not more than 2/3 of the thickness of the fixing portion in the arrangement direction of the fixing portion and the conductive heat exchange row assembly.

6. The battery pack of claim 4, further comprising a dividing beam, the dividing Liang Yongyi dividing the battery pack interior space into at least two subspaces; the dividing beam is the fixing part.

7. The battery pack as claimed in claim 6, wherein the grooves are formed at both sides of the separation beam in the arrangement direction of the separation beam and the conductive heat exchange bank assembly;

the battery pack comprises at least two conductive heat exchange row assemblies, and each conductive heat exchange row assembly is fixed in each groove.

8. The battery pack of any one of claims 3-7, wherein the conductive heat exchange bank assembly is bonded or snapped with the securing portion.

9. The battery pack according to claim 8, wherein the fixing portion is provided with a first fixing surface;

the conductive heat exchange row assembly is provided with a second fixing surface, the conductive heat exchange row assembly is fixed on the first fixing surface through the second fixing surface, and the second fixing surface is matched with the first fixing surface in shape.

10. The battery pack of claim 8, wherein a thermal insulation layer is disposed between the conductive heat exchange bank assembly and the stationary portion.