CN213184412U

CN213184412U - Battery pack and electric automobile

Info

Publication number: CN213184412U
Application number: CN202021814456.9U
Authority: CN
Inventors: 姚祝; 彭青波; 郭舒; 于坤; 苏宏超
Original assignee: Huizhou BYD Industrial Co Ltd
Current assignee: Huizhou BYD Industrial Co Ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-05-11
Anticipated expiration: 2030-08-26

Abstract

The utility model belongs to the technical field of vehicle batteries, in particular to a battery pack, which comprises a shell and a battery array; the battery array comprises a plurality of single batteries which are sequentially arranged; the shell comprises a tray and an upper cover, the upper cover is connected with the tray to form an accommodating cavity, and the battery array is arranged in the accommodating cavity; the tray and the upper cover are both provided with cooling channels for cooling the battery array. The embodiment of the utility model provides an in, the upper cover with the cooling runner of tray can be cooled down to battery cell on two upper and lower not equidirectional of battery package, has increased cooling rate, has reduced battery cell's temperature difference by a wide margin, is favorable to improving battery cell bulk temperature homogeneity, satisfies battery cell's cooling demand, is favorable to prolonging battery package life.

Description

Battery pack and electric automobile

Technical Field

The utility model belongs to the technical field of the automobile-used battery, especially, relate to a battery package and electric automobile.

Background

The battery package is as the electric energy storage unit of electric motor car, and the battery package can produce the heat in the use, if lack corresponding cooling system can lead to battery package high temperature, and then endanger the security of whole car. The most common liquid cooling scheme of the existing battery pack is to arrange a liquid cooling plate between the battery module and the bottom of the battery pack.

However, the weight of the whole battery pack can be increased by arranging the liquid cooling plate at the bottom of the battery pack, and only the bottom of the battery module is in contact with the liquid cooling plate, so that the single battery in the battery module has large temperature difference.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the bottom contact to the liquid cold drawing among the prior art and battery module leads to the monomer battery in the battery module to have the difference in temperature problem, provides a battery package and electric automobile.

In order to solve the above technical problem, an embodiment of the present invention provides a battery pack, which includes a housing and a battery array, where the battery array includes a plurality of single batteries arranged in sequence;

the shell comprises a tray and an upper cover, the upper cover is connected with the tray to form an accommodating cavity, and the battery array is arranged in the accommodating cavity; the tray and the upper cover are both provided with cooling channels for cooling the battery array.

Optionally, the tray includes a bottom plate and a frame surrounding the bottom plate; the cooling flow channel on the tray is arranged on the bottom plate, and the cooling flow channel is a circuitous first cooling flow channel.

Optionally, the bottom plate includes a first upper plate, a first lower plate and a plurality of first reinforcing ribs, a first cavity is formed by connecting the first upper plate and the first lower plate, and the plurality of first reinforcing ribs are disposed in the first cavity to separate the first cavity, so as to form the circuitous first cooling flow channel.

Optionally, a communication bridge is arranged on the bottom plate, the bottom plate includes a plurality of first upper plates, the first cooling flow channels are formed between the first lower plate and each of the first upper plates, and the plurality of first cooling flow channels are communicated with each other through the communication bridge.

Optionally, the bottom plate further includes a first liquid outlet and a first liquid inlet, the first liquid outlet and the first liquid inlet are disposed on the communication bridge, the communication bridge is provided with a liquid inlet channel and a liquid outlet channel, the liquid inlet channel is communicated between the first liquid inlet and each of the inlets of the first cooling flow channels, and the liquid outlet channel is communicated between each of the outlets of the first cooling flow channels and the first liquid outlet.

Optionally, the inlet channel includes a main inlet channel and a plurality of inlet sub-channels, the inlet of the main inlet channel communicates with the first inlet, the outlet of the main inlet channel communicates with each inlet of the inlet sub-channels, and each outlet of the inlet sub-channels communicates with each inlet of the first cooling flow channel in a one-to-one correspondence manner.

Optionally, the liquid outlet channel includes a main liquid outlet channel and a plurality of liquid outlet sub-channels, an outlet of the main liquid outlet channel is communicated with the first liquid outlet, an inlet of the main liquid outlet channel is communicated with an outlet of each liquid outlet sub-channel, and an inlet of each liquid outlet sub-channel is communicated with an outlet of each first cooling flow channel in a one-to-one correspondence manner.

Optionally, the cooling flow channel of the upper cover is a second circuitous cooling flow channel;

the upper cover comprises a second upper plate, a second lower plate and a plurality of second reinforcing ribs, a second cavity is formed by connecting the second upper plate and the second lower plate, and the second reinforcing ribs are arranged in the second cavity to separate the second cavity to form the second cooling flow channel.

Optionally, a second liquid inlet and a second liquid outlet are formed in the upper cover, and the second liquid inlet and the second liquid outlet are both communicated with the second cooling flow channel.

On the other hand, the embodiment of the utility model provides an electric automobile, electric automobile includes as before the battery package.

The embodiment of the utility model provides an in, the upper cover with cooling runner on the tray can cool down battery cell on two upper and lower not equidirectionals of battery package, has increased cooling rate, has reduced battery cell's temperature difference by a wide margin, is favorable to improving battery cell bulk temperature homogeneity, satisfies battery cell's cooling demand, is favorable to prolonging battery package life. And the upper cover and the tray are provided with cooling flow channels, so that a liquid cooling piece does not need to be additionally arranged, the weight of the battery pack is favorably reduced, and the space utilization rate of the battery pack is improved.

Drawings

Fig. 1 is a schematic diagram of an explosion structure of a battery pack according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

fig. 3 is a schematic structural diagram of a bottom plate according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an upper cover according to an embodiment of the present invention;

fig. 5 is a schematic view of an internal structure of a bottom plate according to an embodiment of the present invention.

The reference numerals in the specification are as follows:

1. a base plate; 11. a first lower laminate; 12. a first upper plate; 13. a communicating bridge; 131. a liquid inlet channel; 1311. a main liquid inlet channel; 1312. a liquid inlet sub-channel; 132. a liquid outlet channel; 1321. a main liquid outlet channel; 1322. a liquid outlet sub-channel; 14. a first liquid outlet; 15. a first liquid inlet; 16. a first cooling flow channel 2 and a frame; 21. a cross beam; 3. an array of batteries; 4. an upper cover; 41. a second liquid outlet; 42. a second liquid inlet; 43. a second upper plate; 44. a second lower plate; 45. a second cooling flow channel; 5. a tray.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 5, an embodiment of the present invention provides a battery pack, which includes a housing and a battery array 3 installed in the housing, wherein the battery array 3 includes a plurality of single batteries arranged in sequence, and the plurality of single batteries are arranged along the thickness direction thereof. The casing includes tray 5 and upper cover 4, upper cover 4 with tray 5 is connected and is formed and hold the chamber, battery array 3 is located hold the intracavity, tray 5 with upper cover 4 all is equipped with and is used for right battery array 3 carries out refrigerated cooling runner.

In one embodiment, the upper cover 4 is hermetically connected with the tray 5 to form a sealed accommodating cavity. For example, the upper cover 4 may be connected to the tray 5 by rivets, and a sealing gasket is disposed between the upper cover 4 and the tray 5 to achieve the sealing connection between the upper cover 4 and the tray 5. Of course, in other embodiments, the upper cover 4 and the tray 5 may be connected by sealing glue.

The embodiment of the utility model provides an in, because battery array 3 sets up upper cover 4 with tray 5 connects the intracavity that holds that forms, upper cover 4 with the cooling runner that sets up on tray 5 just can be right on upper and lower two not equidirectional battery array 3's battery cell cools off the temperature, has increased cooling rate, has reduced battery cell's temperature difference by a wide margin, is favorable to improving battery cell bulk temperature homogeneity, satisfies battery cell's cooling demand, is favorable to prolonging battery package life, improves the security of battery package and whole car. Moreover, the upper cover 4 and the tray 5 are provided with cooling channels, so that a liquid cooling piece does not need to be additionally arranged, and the weight of the battery pack is reduced, and the space utilization rate of the battery pack is improved.

Set up liquid cooling board and cool down for among the prior art in the bottom of battery module, the embodiment of the utility model provides a battery package has the homogeneity of higher battery cell bulk temperature, is favorable to prolonging battery package life, and the cooling runner setting is in upper cover 4 with on the tray 5, do not additionally occupy the battery package space, also can open even and quick cooling/heating battery cell of liquid cooling/liquid thermal system when battery cell high temperature/low excessively. Under the low-cost condition, satisfy the cooling demand that the battery package heavy current was filled soon during high temperature, reduce the time of heating for the battery cell before charging during the low temperature, from the car owner's perspective, reduced the charge time, be favorable to the popularization of new forms of energy electric motor car.

In an embodiment, in the battery pack, the bottom surfaces of the plurality of single batteries are combined to form the bottom surface of the battery array 3, the top surfaces of the plurality of single batteries are combined to form the top surface of the battery array, and the poles of the single batteries are arranged on the side surfaces of the single batteries in the length direction.

Tray 5 sets up battery array 3's below, cooling runner on tray 5 is right battery array 3's bottom surface cools down, upper cover 4 sets up battery array 3's top, cooling runner on upper cover 4 is right battery array 3's top surface cools down.

As shown in fig. 1, in an embodiment, the tray 5 includes a bottom plate 1 and a frame 2 surrounding the bottom plate 1. The cooling flow channel on the tray 5 is arranged on the bottom plate 1, and the cooling flow channel is a first circuitous cooling flow channel 16. Wherein, the bottom plate 1 can be connected or welded at the bottom of the frame 2 through rivets.

The bottom plate 1 comprises a first upper plate 12, a first lower plate 11 and a plurality of first reinforcing ribs, a first cavity is formed by connecting the first upper plate 12 and the first lower plate 11, the first reinforcing ribs are arranged in the first cavity, and the first cavity is separated by the first reinforcing ribs to form the roundabout first cooling flow channel 16. In this embodiment, there is no particular limitation on the shape of the first cooling flow channel 16, and the first cooling flow channel 16 may be a U-shaped flow channel, an S-shaped flow channel, or a loop-shaped flow channel.

As shown in fig. 2 to 3, in an embodiment, a communication bridge 13 is provided on the bottom plate 1, the bottom plate 1 includes a plurality of first upper plates 12, the first cooling flow channel 16 is formed between the first lower plate 11 and each of the first upper plates 12, and the plurality of first cooling flow channels 16 are communicated with each other through the communication bridge 13.

In an embodiment, a cross beam 21 is disposed on the frame 2, when the bottom plate 1 is connected to the bottom of the frame 2, the first upper plate 12 is connected to the frame 2, a plurality of first upper plates 12 are disposed side by side on a side of the first upper plate 12 facing the upper cover 4, and the first upper plates 12 are disposed on both sides of the cross beam 21 due to the blocking of the cross beam 21.

As shown in fig. 1 to 2, one cross beam 21 is disposed on the frame 2, the cross beam 21 divides the frame 2 into two regions, one first upper plate 12 is disposed in each region, the first cooling flow channel 16 is formed between each first upper plate 12 and the first lower plate 11, the communication bridge 13 is disposed on the bottom plate 1, and the two first cooling flow channels 16 are communicated through the communication bridge 13.

As shown in fig. 5, in an embodiment, the bottom plate 1 further includes a first liquid outlet 14 and a first liquid inlet 15 disposed on the communication bridge 13, the communication bridge 13 is provided with a liquid inlet channel 131 and a liquid outlet channel 132 which are separated, the liquid inlet channel 131 is communicated between the first liquid inlet 15 and the inlet of each first cooling flow channel 16, and the liquid outlet channel 132 is communicated between the outlet of each first cooling flow channel 16 and the first liquid outlet 14.

In one embodiment, the liquid inlet channel 131 and the liquid outlet channel 132 are arranged in parallel in the communication bridge 13, the liquid inlet channel 131 is located inside the liquid outlet channel 132, and the liquid outlet channel 132 bypasses the first liquid inlet 15 and is arranged on the periphery of the liquid inlet channel 131. Alternatively, the liquid inlet channel 131 is located outside the liquid outlet channel 132, and the liquid inlet channel 131 bypasses the first liquid outlet 14 and is disposed on the periphery of the liquid outlet channel 132.

The cooling liquid enters the first cooling flow channel 16 in the first cavity from the first liquid inlet 15, flows in the first cooling flow channel 16, exchanges heat with the battery array 3 above the bottom plate 1, cools the bottom surface of the battery array 3, and finally flows out from the first liquid outlet 14. Preferably, the coolant is antifreeze, which can prevent the coolant from freezing in low-temperature weather.

As shown in fig. 5, in an embodiment, the liquid inlet channel 131 includes a liquid inlet main channel 1311 and a plurality of liquid inlet sub-channels 1312, an inlet of the liquid inlet main channel 1311 is communicated with the first liquid inlet 15, an outlet of the liquid inlet main channel 1311 is communicated with an inlet of each liquid inlet sub-channel 1312, and an outlet of each liquid inlet sub-channel 1312 is communicated with an inlet of each first cooling flow channel 16 in a one-to-one correspondence manner. The coolant flowing from the first liquid inlet 15 is branched by the liquid inlet main channel 1311 and flows into the plurality of first cooling channels 16 through the plurality of liquid inlet sub-channels 1312.

As shown in fig. 5, in an embodiment, the liquid outlet channel 132 includes a main liquid outlet channel 1321 and a plurality of liquid outlet sub-channels 1322, an outlet of the main liquid outlet channel 1321 is communicated with the first liquid outlet 14, an inlet of the main liquid outlet channel 1321 is communicated with an outlet of each of the liquid outlet sub-channels 1322, and an inlet of each of the liquid outlet sub-channels 1322 is communicated with an outlet of each of the first cooling flow channels 16 in a one-to-one correspondence manner.

Thus, the cooling liquid sequentially passes through the first liquid inlet 15, the liquid inlet channel 131, the first cooling flow channel 16, the liquid outlet channel 132 and the first liquid outlet 14, so as to cool the bottom surface of the battery array 3.

Specifically, the liquid inlet channel 131 communicates with each first cooling flow channel 16, the cooling liquid enters from the first liquid inlet 15, and flows into the first cooling flow channel 16 through the liquid inlet channel 131, the liquid inlet channel 131 and the liquid outlet channel 132 are arranged in parallel in the communication bridge 13 and are not communicated with each other, the cooling liquid flowing in from the first liquid inlet 15 can only flow into each first cooling flow channel 16 through the liquid inlet channel 131, the cooling liquid flows in the first cooling flow channel 16, and after the cooling liquid is cooled by heat exchange with the battery array 3, the cooling liquid flows through the liquid outlet channel 132 and flows out from the first liquid outlet 14.

In an embodiment, the cooling flow channel of the upper cover 4 is a second winding cooling flow channel 45. In this embodiment, the shape of the second cooling flow channel 45 is not particularly limited, and the second cooling flow channel 45 may be a U-shaped flow channel, an S-shaped flow channel, or a square-shaped flow channel.

As shown in fig. 4, the upper cover 4 includes a second upper plate 43, a second lower plate 44, and a plurality of second reinforcing ribs, wherein a second cavity is formed by connecting the second upper plate 43 and the second lower plate 44, and the plurality of second reinforcing ribs are disposed in the second cavity to partition the second cavity to form a plurality of second cooling channels 45.

In an embodiment, the upper cover 4 is provided with a second liquid inlet 42 and a second liquid outlet 41, and both the second liquid inlet 42 and the second liquid outlet 41 are communicated with the second cooling flow channel 45. Thus, the cooling liquid sequentially passes through the second liquid inlet 42, the second cooling flow channel 45 and the second liquid outlet 41, so as to cool the top surface of the battery array 3.

Specifically, the cooling liquid enters from the second liquid inlet 42 and flows into the second cooling flow channel 45, and the cooling liquid flows in the second cooling flow channel 45 to exchange heat with the battery array 3, so as to cool the upper part of the battery array 3.

The utility model discloses in, tray 5 sets up battery array 3's below, first cooling runner 16 is right battery array 3's bottom surface cools down, upper cover 4 sets up battery array 3's top, second cooling runner 45 cools down battery array 3's top surface for there is not the difference in temperature in the direction of height for battery cell in the battery module, improves battery cell bulk temperature homogeneity. The temperature difference of the same single battery in the height direction can be reduced, the temperature difference among different single batteries can also be reduced, the safety performance of the battery pack is improved, and the service life of the battery pack is prolonged.

The utility model discloses another embodiment provides an electric automobile, electric automobile includes as before the battery package, in the battery package first liquid outlet 14 first inlet 15 is connected with whole car pipe connection, realizes the circulation of coolant liquid on the bottom plate 1 realizes heat exchange with battery cell. The second liquid outlet 41 and the second liquid inlet 42 are connected with a whole vehicle pipeline to realize circulation of cooling liquid on the upper cover 4 and realize heat exchange with the single battery.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The battery pack is characterized by comprising a shell and a battery array, wherein the battery array comprises a plurality of single batteries which are sequentially arranged;

2. The battery pack of claim 1, wherein the tray comprises a base plate and a rim around the periphery of the base plate; the cooling flow channel on the tray is arranged on the bottom plate, and the cooling flow channel is a circuitous first cooling flow channel.

3. The battery pack of claim 2, wherein the base plate comprises a first upper plate, a first lower plate and a plurality of first reinforcing ribs, the first upper plate and the first lower plate are connected to form a first cavity, and the plurality of first reinforcing ribs are disposed in the first cavity to partition the first cavity to form the circuitous first cooling flow channel.

4. The battery pack according to claim 3, wherein a communication bridge is provided on the base plate, the base plate includes a plurality of the first upper plates, the first cooling flow passage is formed between the first lower plate and each of the first upper plates, and the plurality of first cooling flow passages are communicated with each other through the communication bridge.

5. The battery pack of claim 4, wherein the bottom plate further comprises a first liquid outlet and a first liquid inlet disposed on the connecting bridge, the connecting bridge is provided with a liquid inlet channel and a liquid outlet channel which are separated from each other, the liquid inlet channel is communicated between the first liquid inlet and the inlet of each of the first cooling flow channels, and the liquid outlet channel is communicated between the outlet of each of the first cooling flow channels and the first liquid outlet.

6. The battery pack according to claim 5, wherein the liquid inlet channel comprises a main liquid inlet channel and a plurality of liquid inlet sub-channels, an inlet of the main liquid inlet channel is communicated with the first liquid inlet, an outlet of the main liquid inlet channel is communicated with an inlet of each liquid inlet sub-channel, and an outlet of each liquid inlet sub-channel is communicated with an inlet of each first cooling flow channel in a one-to-one correspondence manner.

7. The battery pack as recited in claim 5, wherein the liquid outlet channel comprises a main liquid outlet channel and a plurality of liquid outlet sub-channels, an outlet of the main liquid outlet channel is communicated with the first liquid outlet, an inlet of the main liquid outlet channel is communicated with an outlet of each liquid outlet sub-channel, and an inlet of each liquid outlet sub-channel is communicated with an outlet of each first cooling flow channel in a one-to-one correspondence manner.

8. The battery pack according to claim 1, wherein the cooling flow passage of the upper cover is a second cooling flow passage that is circuitous;

9. The battery pack according to claim 8, wherein the upper cover is provided with a second liquid inlet and a second liquid outlet, and the second liquid inlet and the second liquid outlet are both communicated with the second cooling channel.

10. An electric vehicle characterized in that the electric vehicle comprises the battery pack according to any one of claims 1 to 9.