CN216015505U

CN216015505U - Battery box and battery pack

Info

Publication number: CN216015505U
Application number: CN202122085884.3U
Authority: CN
Inventors: 张波; 陈斌斌; 贺月辉; 蔡华俭; 花黄伟
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-03-11
Anticipated expiration: 2031-08-31
Also published as: WO2023030204A1

Abstract

The application discloses a battery box and a battery pack, wherein the battery box comprises a box body and a plurality of supporting parts, the supporting parts are connected to the bottom wall of the box body, and an accommodating space is defined by the adjacent supporting parts and the bottom wall; wherein, at least partial accommodation space is formed with first wind channel, and first wind channel is used for making the outside air flow of box inside to the box. This application can construct the wind channel based on the existing structure of battery box to can reduce or save wind channel spare, help simplifying assembly process, reduce cost.

Description

Battery box and battery pack

Technical Field

The application relates to the technical field of power batteries, in particular to a battery box and a battery pack.

Background

Air cooling is a common way for dissipating heat inside a battery pack, and in the related art, a plurality of air ducts are usually assembled to a battery box to form an air duct.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving at least one of the problems in the prior art. Therefore, the battery box is provided, the number of the air duct pieces can be reduced, the assembly process is simplified, and the cost is reduced.

The application also discloses a battery pack using the battery box.

According to the battery box of the first embodiment of the present application, including:

a box body;

the supporting parts are connected to the bottom wall of the box body, and the adjacent supporting parts and the bottom wall define an accommodating space;

and a first air duct is formed in at least part of the accommodating space and is used for enabling air outside the box body to flow to the inside of the box body.

According to the battery box of this application embodiment, have following beneficial effect at least:

the air duct can be constructed based on the existing structure of the battery box, so that air duct pieces can be reduced or omitted, the assembly process is facilitated to be simplified, and the cost is reduced.

According to some embodiments of the application, the battery box further comprises a first air duct piece, the first air duct piece is located in the corresponding accommodating space, and the first air duct piece and the side wall of the adjacent supporting portion jointly define the first air duct.

According to some embodiments of the present application, the first air duct has a gradually decreasing cross-sectional area in a direction of flow of the air stream.

According to some embodiments of the present application, the first air duct member has an inclined surface, the inclined surface is disposed on a side of the first air duct member facing away from the bottom wall, and a distance between the inclined surface and the bottom wall gradually increases along a direction in which the air flow flows.

According to some embodiments of the application, the battery box further comprises a second air duct piece, the second air duct piece is located in the corresponding accommodating space, and the first air duct is defined inside the second air duct piece.

According to some embodiments of the present application, the second air duct member defines therein a plurality of the first air ducts, and the air inlets and the air outlets of the first air ducts are independently arranged, and the air outlets are sequentially arranged along the direction of the airflow.

According to some embodiments of the present application, a second air duct is formed in a portion of the accommodating space, and the second air duct is used for allowing air in the box body to flow to the outside of the box body.

According to some embodiments of the present application, the cross-sectional area of the second air duct is gradually reduced along the direction of the airflow;

and/or the width of the air inlet of the second air duct is gradually reduced along the flowing direction of the air flow.

A battery pack according to a second embodiment of the present application includes:

the battery box;

the battery module is located in the battery box and comprises a shell assembly, the shell assembly is provided with a plurality of ventilation channels, and each ventilation channel is communicated with the first air channel.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The present application is further described with reference to the following figures and examples, in which:

fig. 1 is a perspective view of a battery box according to a first embodiment of the present application;

FIG. 2 is an exploded view of the battery compartment of FIG. 1;

FIG. 3 is a perspective view of the body of FIG. 1;

FIG. 4 is a side view of the body of FIG. 3;

fig. 5 is a sectional view of the battery case of fig. 1 taken along a length direction thereof;

fig. 6 is a perspective view of a battery box according to a second embodiment of the present application;

FIG. 7 is an exploded view of the battery compartment of FIG. 6;

FIG. 8 is a perspective view of the second air duct member of FIG. 6;

fig. 9 is a sectional view of the battery case of fig. 6 taken along the length direction thereof;

fig. 10 is a cross-sectional view of a battery pack in the width direction in the embodiment of the present application;

fig. 11 is a sectional view of the battery pack of fig. 10 in a length direction;

FIG. 12 is an enlarged view of area A of FIG. 11;

fig. 13 is a perspective view illustrating the battery module of fig. 10.

Reference numerals:

the air conditioner comprises a battery box 100, a box body 110, a main body 111, an end cover 112, a first air inlet 113, a second air outlet 114, a baffle plate 115, a third air inlet 116, a supporting part 120, a containing space 130, a first air duct 140, a first air duct piece 150, an inclined plane 151, a second air duct piece 160, a second air inlet 161, a first air outlet 162 and a second air duct 170;

battery module 200, casing assembly 210, ventilation passageway 211, separator 212, battery core 220.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.

In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.

In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the related art, the air duct inside the battery pack is formed by assembling a plurality of air duct pieces, the process is complex, and the generation cost and the assembly cost are high. Based on this, the application discloses battery box can construct the wind channel based on the existing structure of battery box to can reduce or save wind channel spare, help simplifying assembly process, reduce cost.

The battery box 100 includes a box body 110, the box body 110 is a substantially rectangular box body structure, and a specific structure of the box body 110 is as shown in fig. 1 and fig. 2, and includes a main body 111, an end cover 112, and a top cover not shown, wherein the main body 111 includes a bottom plate and side plates integrally connected, and the front and rear sides of the bottom plate are connected with the side plates. The left and right sides of the main body 111 are connected to end caps 112 by means of screw fasteners or the like, thereby defining an inner cavity of the case 110 together. The top cover is connected to the top of the main body 111, and can cover the opening of the case 110, thereby protecting the internal components of the battery pack.

Referring to fig. 3 and 4, in general, the battery box 100 further includes a supporting portion 120, and the supporting portion 120 is disposed on a bottom wall (specifically, in the figures, a bottom wall of the main body 111) of the box body 110 and protrudes upward. The support part 120 serves to support members (e.g., battery modules) within the battery case 100 while serving as a fixing base for the members within the case, providing an assembly position for fasteners such as screws, that is, the support part 120 belongs to an existing structure of the battery case 100.

In this embodiment, the battery box 100 includes a plurality of supporting portions 120, and the supporting portions 120 have the same height, so that different positions of the components in the box can be supported, respectively, to provide more supporting points. Each support portion 120 is connected to main part 111 in an interval distribution mode, thereby defining accommodating space 130 between adjacent support portion 120 and the diapire, on the one hand can alleviate the weight of whole battery box 100, simultaneously can also form first wind channel 140 in accommodating space 130, during the use, with battery module's ventilation passageway 211 and first wind channel 140 intercommunication, can follow the external cold air that introduces and carry out the forced air cooling heat dissipation to the incasement component. It should be noted that the term "forming the first air duct 140 in the accommodating space" in the present application should be broadly understood to include the following cases: firstly, the accommodating space 130 itself serves as a first air duct 140, that is, the air duct is constructed only by the box body 110 itself; part of the accommodating space 130 is used as a first air duct 140, that is, the box body 110 and the air duct member together construct an air duct; the accommodating space 130 serves as an installation space of the air duct member, the air duct is constructed by the air duct member, and the first air duct 140 is formed in the accommodating space 130 because the air duct member is located in the accommodating space 130. Based on the above, the battery box 100 of the present embodiment uses the supporting portion 120 to construct the air duct, so that the purposes of reducing components, simplifying assembly, and reducing the volume of the battery box can be achieved.

In order to accommodate the support of the tank interior, the support 120 extends along the length direction (e.g., the left-right direction in the drawing) of the main body 111, and has a length equal to that of the main body 111, and when the cover 112 is coupled to the main body 111, the inner sidewall of the cover 112 may be fitted to the end of the support 120. Correspondingly, the box 110 is provided with an air inlet, specifically, the air inlet (for convenience of description, referred to as a first air inlet 113) is provided on an end cover 112 (e.g., a left end cover 112 in fig. 2) on one side of the main body 111, and the first air inlet 113 is communicated with the accommodating space 130 formed with the first air duct 140, so that external air can enter the accommodating space 130 through the first air inlet 113, and air leakage from a connection between the end cover 112 and the main body 111 can be avoided, thereby affecting the air volume entering the accommodating space 130.

In the above solution, the supporting portion 120 and the box 110 (specifically, the main body 111 in the figures) may be integrally connected, for example, by an aluminum alloy frame formed by extrusion molding. The inside of the support portion 120 is hollow, contributing to weight reduction of the battery case.

Referring to fig. 2 and 5, as a specific implementation of constructing the first air duct 140 in the above embodiment, the battery box 100 further includes a first air duct member 150, the first air duct member 150 is located in the corresponding accommodating space 130, and defines the first air duct 140 together with the side wall of the adjacent supporting portion 120, that is, in this scheme, the first air duct 140 is constructed together with the box body 110 through the first air duct member 150, the external air enters the first air duct 140 from the left side of the box body 110, and then enters the battery module upwards to dissipate heat, and the flow direction of the air is shown by a dotted arrow in the figure.

When air flows in the air duct, the air quantity is uneven, generally speaking, the air quantity far away from the air inlet is smaller than the air quantity close to the air outlet, and therefore the heat dissipation is uneven. Based on this, a modified scheme is also disclosed, in which uniform ventilation is achieved by changing the cross-sectional area of the first air duct 140, specifically, along the direction in which the airflow flows in the first air duct 140 (for example, the direction from left to right in fig. 5), the cross-sectional area of the first air duct 140 is gradually reduced, so that the flow velocity of the gas can be gradually increased, and thus, the amount of air flowing into each position in the battery module along the length direction is substantially the same.

Referring to fig. 5, the first air duct member 150 has an inclined surface 151, the inclined surface 151 is disposed on a side (e.g., an upper side in the drawing) of the first air duct member 150 opposite to the bottom wall of the main body 111, and an inclination direction of the inclined surface 151 satisfies the following requirement: the distance between the inclined surface 151 and the bottom wall 111 is gradually increased along the flowing direction of the air flow, so that the purpose of gradually reducing the sectional area is achieved. In this embodiment, the first air duct 140 is constructed by using the first air duct member 150 with a simple structure, and the inclined surface 151 ensures uniform delivery of air volume, so that the cross section of the supporting portion 120 can be kept constant, and the supporting portion can be conveniently formed in an integral forming manner; in addition, the first duct 150 may be assembled into the accommodating space 130 in an embedded manner, and the assembly manner is simple.

Referring to fig. 6 and 7, as another specific implementation of constructing the first air duct 140 in the foregoing embodiment, the battery box 100 further includes a second air duct member 160, the second air duct member 160 is located in the corresponding accommodating space 130, and the inside of the second air duct member 160 defines the first air duct 140, that is, in this scheme, the first air duct 140 is completely constructed by the second air duct member 160, and the accommodating space 130 is mainly used for implementing installation of the second air duct member 160.

Referring to fig. 8 and 9, the second air duct member 160 has a cubic structure, and has a shape similar to the receiving space 130, so as to facilitate insertion installation. The first air duct 140 is formed with an air inlet (for convenience of description, referred to as a second air inlet 161) at an end portion (for example, a left end in the drawing) of the second air duct member 160, and is formed with an air outlet (for convenience of description, referred to as a first air outlet 162) at a top portion of the second air duct member 160, and external air enters the first air duct 140 from the left side of the case 110 through the first air inlet 113 and the second air inlet 161, and then passes upward through the first air outlet 162 and a ventilation channel of the battery module to enter the battery module for heat dissipation, and a flow direction of the air is shown by a dotted arrow in the drawing.

Similarly, to solve the problem of uneven air volume, in a further modification, the cross-sectional area of the first air duct 140 is gradually reduced along the direction of the airflow flowing in the first air duct 140 (for example, the direction from left to right in fig. 8), specifically, the bottom air duct wall of the first air duct 140 is obliquely arranged, and the distance from the bottom air duct wall to the bottom wall of the main body 111 is gradually increased along the flowing direction of the airflow. In this way, the overall shape of the second air duct member 160 can be maintained in a cubic structure, and the second air duct member can be easily installed in the accommodating space 130.

Have a plurality of electric cores in the battery module, the interval between the adjacent electric core is equal, therefore can guarantee that the amount of wind that every electric core obtained is roughly equal through the mode of aforesaid diminishing the sectional area gradually, however, when installing a plurality of battery modules in battery box 100 (show the casing subassembly 210 of battery module 200 through the dashed line frame in the electricity figure 9), the clearance between the adjacent battery module is greater than the clearance between the adjacent electric core 220 in same module 200, lead to along the length direction on the distance between the adjacent electric core of electric core have the phenomenon of imbalance, also interval t1 is less than t2, if only set up single first wind channel, will be difficult to adapt to because the not enough problem of the amount of wind that the interval sudden change leads to. Based on this, in a further improvement, a plurality of first air ducts 140 are defined in the second air duct member 160, each second air inlet 161 and each first air outlet 162 are independently arranged, and each first air outlet 162 is sequentially arranged along the flowing direction of the air flow in the first air duct 140, that is, each first air duct 140 in the second air duct member 160 is independent from each other, and each first air duct 140 corresponds to the heat dissipation of one battery module, so that the air volume sent to different areas in the same battery module is approximately equal in the length direction.

As a modified example of the first embodiment, referring to fig. 2, 4 and 7, a first air duct 140 is formed in a part of the accommodating space 130, a second air duct 170 is formed in another part of the accommodating space 130, the second air duct 170 is used as an air outlet duct, for discharging the air in the case 110 to the outside of the case 110, that is, the cold air is delivered into the battery module through the first air duct 140, the hot air after heat exchange enters the second air duct 170 from the battery module, and finally is delivered out of the case 110 through the second air duct 170, by the above arrangement, the structure of the battery box can be further simplified, meanwhile, condensed water is easily generated during the interaction of cold and hot air, and the air inlet and outlet channels are arranged on the bottom wall of the box body 110, namely the bottom of the battery module, the condensed water is collected in the air duct, and insulation hidden troubles caused by the fact that the condensed water flows into the battery module are avoided.

In order to facilitate the discharge of the hot air, the box body 110 is further provided with an air outlet on the opposite side of the air inlet, specifically, the air outlet (for convenience of description, referred to as a second air outlet 114) is provided on the end cover 112 (for example, the right end cover 112 in fig. 2) on the other side of the main body 111, and the second air outlet 114 is communicated with the accommodating space 130 formed with the second air duct 170.

The plurality of supporting portions 120 in this embodiment extend in the length direction and are parallel to each other, and in two adjacent accommodating spaces 130, one of the supporting portions has a first air duct 140 formed therein, and the other supporting portion has a second air duct 170 formed therein. Taking the example shown in the figure, specifically, 5 supporting portions 120 are provided, so as to define 4 accommodating spaces 130 arranged in sequence along the front-back direction, a first air duct 140 is formed in the two accommodating spaces 130 located at the outer side, and a second air duct 170 is formed in the two accommodating spaces 130 located at the inner side, that is, the embodiment can provide two heat dissipation channels, and is suitable for the situation that two rows of electric cores are provided in the battery module along the front-back direction.

Similarly, in order to solve the problem of uneven air volume, in a further modification of the above embodiment, the cross-sectional area of the second air duct 170 may also be gradually reduced along the airflow direction, and the implementation manner thereof is the same as that of the above embodiment, and will not be described in detail here. In addition, the present embodiment provides another way to achieve uniform air volume, referring to fig. 3, a baffle 115 is disposed above the accommodating space 130 formed with the second air duct 170, a third air inlet 116 is disposed on the baffle 115, and as an air inlet of the second air duct 170, the width of the third air inlet 116 is gradually reduced along the direction of the air flow, which also achieves increasing the flow rate of the air flow.

It should be noted that the above-mentioned solution for adjusting the width of the air inlet is also applicable to the first air duct 140, in this case, the first air duct 140 may be completely formed by the supporting portion 120, so that the air duct member may be omitted.

In addition, in an alternative embodiment of the present application, the second air duct 170 may not be provided, and the hot air is directly discharged out of the case 110 through the battery module.

Referring to fig. 10 to 12, the present embodiment further discloses a battery pack, where the battery pack includes the battery box 100 and the battery module 200 of the above embodiment, and the battery module 200 is mounted in the box body 110 and fixed on the support 120 by a fastener. The ventilation duct 211 of the battery module 200 communicates with the first air duct 140, and can dissipate heat by external cold air. Specifically, the battery module 200 includes a housing assembly 210 and a plurality of battery cells 220, the plurality of battery cells 220 are arranged along a length direction (i.e., a left-right direction) of the housing assembly 210 at intervals, a gap exists between adjacent battery cells, and cold air enters the gap between adjacent battery cells through the first air duct 140 to dissipate heat.

When the battery pack adopts the battery box 100 shown in fig. 6 and 7, two rows of battery cells are arranged in the battery module 200, the two rows of battery cells are distributed along the width direction (i.e., the front-back direction) of the casing assembly 210, and the battery cells in the same row are arranged at intervals along the length direction (i.e., the left-right direction) of the casing assembly 210. Based on this, referring to fig. 13, a plurality of ventilation channels 211 (one ventilation channel 211 is indicated by a dashed box in the figure) are correspondingly disposed on the housing assembly 210, and the plurality of ventilation channels 211 are distributed along the length direction so as to respectively correspond to the intervals between the battery cells. Each ventilation channel 211 comprises four ventilation holes, the four ventilation holes are sequentially communicated with two first air ducts 140 and two second air ducts 170, specifically, referring to fig. 10, along the direction from the front to the back, the first ventilation holes are communicated with the first air ducts 140 on the front side, the second ventilation holes are communicated with the second air ducts 170 on the front side, the third ventilation holes are communicated with the second air ducts 170 on the back side, the fourth ventilation holes are communicated with the first air ducts 140 on the back side, the airflow flowing direction is shown by dotted arrows in the figure, therefore, the first air ducts 140 on the left side, the second air ducts 170 and the two ventilation holes on the left side are jointly used for heat dissipation of two adjacent electric cores in the first row, the first air ducts 140 on the right side, the second air ducts 170 and the two ventilation holes on the right side are jointly used for heat dissipation of two adjacent electric cores in the second row, and the large battery module with more electric cores is suitable for being placed.

The casing assembly 210 includes a plurality of partitions 212, adjacent cells are partitioned by the partitions to form gaps between the cells, and the bottom of the partitions 212 is provided with the above-described ventilation channel 211.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

Claims

1. Battery box, its characterized in that includes:

a box body;

2. The battery box of claim 1, further comprising a first air duct member located in the corresponding accommodating space and defining the first air duct together with the side wall of the adjacent support portion.

3. The battery box according to claim 2, wherein the first air duct has a gradually decreasing cross-sectional area in the direction of the airflow.

4. The battery box according to claim 3, wherein the first air duct member has an inclined surface, the inclined surface is disposed on a side of the first air duct member facing away from the bottom wall, and a distance between the inclined surface and the bottom wall increases gradually in a direction in which the air flow flows.

5. The battery box according to claim 1, further comprising a second air duct member located in the corresponding accommodating space, and an interior of the second air duct member defines the first air duct.

6. The battery box according to claim 5, wherein the first air duct has a gradually decreasing cross-sectional area in the direction of the airflow.

7. The battery box according to claim 5, wherein a plurality of the first air ducts are defined in the second air duct member, and the air inlets and the air outlets of the first air ducts are independently arranged, and the air outlets are sequentially arranged along the direction of the airflow.

8. The battery box according to claim 1, wherein a second air duct is formed in a part of the accommodating space, and the second air duct is used for allowing air in the box body to flow to the outside of the box body.

9. The battery box according to claim 8, wherein the cross-sectional area of the second air duct is gradually reduced in the direction of the airflow;

10. A battery pack, comprising:

a battery case according to any one of claims 1 to 9;