CN213124560U

CN213124560U - Battery package liquid cooling board, battery package and electric motor car

Info

Publication number: CN213124560U
Application number: CN202022150461.0U
Authority: CN
Inventors: 修书董; 张海建; 任荣彬; 杨振宇; 郑慧苗
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-05-04
Anticipated expiration: 2030-09-25

Abstract

The utility model relates to a battery package liquid cold drawing, battery package and electric motor car, this battery package liquid cold drawing include liquid cooling plate body and flame retardant coating, and liquid cooling plate body is used for cooling battery cell, and the flame retardant coating setting is on liquid cooling plate body and with the laminating of liquid cooling plate body, and the projection of flame retardant coating in upper and lower direction covers the projection of liquid cooling plate body in upper and lower direction, and the surface that the flame retardant coating deviates from liquid cooling plate body is used for laminating with battery cell's surface. Through above-mentioned technical scheme, on the one hand, the produced most heat of battery cell is absorbed by the coolant liquid in the battery liquid cold drawing, and then realize the cooling to battery cell, on the other hand, because flame retardant coating itself has fire retardance or incombustibility, the flame retardant coating of laminating setting on liquid cooling plate surface can postpone catching fire and reducing battery cell's burning rate of battery cell, postpone the transmission of flame temperature, control battery cell's thermal runaway effectively, thereby improve the security performance of battery package.

Description

Battery package liquid cooling board, battery package and electric motor car

Technical Field

The disclosure relates to the technical field of battery packs, in particular to a battery pack liquid cooling plate, a battery pack and an electric vehicle.

Background

With the rapid development of social economy, electric vehicles are more and more favored by consumers. The electric vehicle uses the battery pack as an energy source, so the use condition of the battery pack directly determines the driving safety of the electric vehicle. When the temperature of the single battery in the battery pack is too high or the charging voltage is too high, a plurality of potential heat release side effects are caused, and if the heat is not dissipated, the battery temperature is rapidly increased, the thermal runaway rapidly spreads, and therefore a large potential safety hazard is formed. Therefore, how to control and delay the propagation speed of thermal runaway of the battery pack has become an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

The purpose of the present disclosure is to provide a battery pack liquid cooling plate, a battery pack and an electric vehicle, wherein the battery pack liquid cooling plate can prevent and delay the spread of thermal runaway of a single battery, so as to improve the safety performance of the battery pack.

In order to realize the above-mentioned purpose, the present disclosure provides a battery package liquid cooling board, including liquid cooling board plate body and flame retardant coating, liquid cooling board plate body is used for cooling battery cell, the flame retardant coating sets up on the liquid cooling board plate body and with the laminating of liquid cooling board plate body, the ascending projection of flame retardant coating in upper and lower direction covers liquid cooling board plate body is in ascending projection from top to bottom, the flame retardant coating deviates from the surface of liquid cooling board plate body is used for laminating with battery cell's surface.

Optionally, the liquid cooling plate body has a first outer surface and a second outer surface opposite to each other in the up-down direction, and the fire-proof layer is disposed on each of the first outer surface and the second outer surface.

Optionally, the fireproof layer is fireproof paint sprayed on the liquid cooling plate body.

Optionally, the fire-proof layer is made of an expansion type fire-proof material capable of expanding and foaming when heated.

Optionally, the fire-proof layer is made of a material capable of decomposing non-combustible gas when heated.

Optionally, the liquid cooling plate body has a plurality of undercut depressed parts, the depressed part is followed the width direction of battery package liquid cooling board extends, and is a plurality of the depressed part is followed the length direction of battery package liquid cooling board arranges, the shape and the size structure of depressed part be with the shape and the size looks adaptation of cell's outer peripheral face for it is located to be used for holding the cell above the liquid cooling plate body.

Optionally, the liquid cooling plate body still has a plurality of bellied bulges that make progress, and is a plurality of depressed part and a plurality of the bulge is followed length direction staggered arrangement, so that the liquid cooling plate body forms into the wave form, the shape and the size structure of bulge be with the shape and the size looks adaptation of cell's outer peripheral face for be used for holding and be located the liquid cooling plate body below the cell.

Optionally, the liquid cooling plate body is composed of a plurality of flat tubes arranged along the width direction of the battery pack liquid cooling plate, and the interior of each flat tube is hollow to form a flow channel for cooling liquid to flow through.

According to a second aspect of the present disclosure, a battery pack is provided, which includes the above battery pack liquid cooling plate and a single battery, and the fire-proof layer of the battery pack liquid cooling plate is clamped between the single battery and the liquid cooling plate body of the battery pack liquid cooling plate.

According to a third aspect of the present disclosure, there is provided an electric vehicle including the battery pack as described above.

Through above-mentioned technical scheme, on the one hand, the produced most heat of battery cell is absorbed by the coolant liquid in the battery liquid cold drawing, and then realize the cooling to battery cell, on the other hand, because flame retardant coating itself has fire retardance or incombustibility, the flame retardant coating of laminating setting on liquid cooling plate surface can postpone catching fire and reducing battery cell's burning rate of battery cell, postpone the transmission of flame temperature, control battery cell's thermal runaway effectively, thereby improve the security performance of battery package.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic perspective view of a battery pack liquid cooling plate provided in an exemplary embodiment of the present disclosure;

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

fig. 3 is a schematic front view of a battery pack liquid cooling plate provided in an exemplary embodiment of the present disclosure; the upper surface and the lower surface of the liquid cooling plate body are respectively provided with a single battery;

FIG. 4 is an enlarged view of portion B of FIG. 3;

fig. 5 is a schematic top view of a battery pack liquid cooling plate provided in an exemplary embodiment of the present disclosure.

Description of the reference numerals

1 liquid cooling plate body of battery-packed liquid cooling plate 10

11 fireproof layer 12 single battery

13 liquid collecting pipe 14 input port

15 outlet 20 fill area

101 concave part 102 convex part

103 flat tube 104 baffle

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the terms of orientation such as "up-down direction, length direction, and width direction" are defined with reference to the liquid-cooled plate of the battery pack during normal use, specifically, the up-down direction is as shown in fig. 3, the width direction and length direction are as shown in fig. 1, and "inside and outside" refer to the inside and outside of the corresponding structure or profile of the component. The above definitions are merely provided to aid in the description of the present disclosure and should not be construed as limiting.

Referring to fig. 1 to 5, the present disclosure provides a battery-packed liquid cooling plate 1, including a liquid cooling plate body 10 and a fireproof layer 11, the liquid cooling plate body 10 is used for cooling a battery cell, the fireproof layer 11 is disposed on the liquid cooling plate body 10 and attached to the liquid cooling plate body 10, the fireproof layer 11 covers the projection of the liquid cooling plate body 10 in the up-down direction, and the surface of the fireproof layer 11 departing from the liquid cooling plate body 10 is used for attaching to the outer surface of the battery cell 12.

Through above-mentioned technical scheme, on the one hand, the produced most heat of battery cell 12 is absorbed by the coolant liquid in the battery liquid cold drawing, and then realize the cooling to battery cell 12, on the other hand, because flame retardant coating itself has fire retardance or incombustibility, the flame retardant coating 11 of laminating setting on the surface of liquid cooling plate body 10 can postpone catching fire of battery cell 12 and reduce battery cell 12's burning rate, postpone the transmission of flame temperature, thermal runaway to battery cell 12 controls effectively, thereby improve the security performance of battery package.

As shown in fig. 3 and 4, the liquid-cooled panel body 10 has a first outer surface and a second outer surface which are opposite to each other in the up-down direction, and the first outer surface and the second outer surface are each provided with a fireproof layer 11. That is, both the first outer surface and the second outer surface of the liquid-cooled plate body 10 can be used to cool the unit cells 12. Carry out the refrigerated in-process at the liquid cooling plate 10 respectively to the monomer battery 12 of laminating on the first surface and the monomer battery 12 of laminating on the second surface, can also play the separation effect to the monomer battery 12 on different layers, the mutual contact and the heat transfer between the adjacent monomer battery 12 of direction about having avoided following, and, when monomer battery 12 takes place to catch fire, flame retardant coating 11 can postpone catching fire of monomer battery 12 and reduce the burning rate of monomer battery 12, and prevent flame from spreading to another layer of monomer battery 12 direction from one deck monomer battery 12, further improve the security performance of battery package.

Alternatively, the fire-resistant layer 11 may be a fire-resistant paint sprayed on the liquid-cooled panel body 10. The fireproof paint itself is non-combustible or non-combustible, and can reduce the surface flammability of the liquid-cooled panel body 10 and retard the rapid spread of flame.

In one embodiment provided by the present disclosure, the fire-proof layer 11 is made of an intumescent fire-proof material that can expand and foam when heated. When the flame retardant coating 11 is heated, can expand the foam that forms certain thickness, can form the protective layer after the foam carbomorphism, the protective layer forms between cell 12 and liquid cooling plate body 10, and the protective layer after the carbomorphism is incombustible, consequently, can play the effect of separation air, heat transmission between a plurality of cell 12 to reach separation thermal runaway's purpose, further prolong the time that thermal runaway spreads. Alternatively, the fire-retardant layer 11 may be composed of chlorinated rubber, paraffin and various fire-retardant additives. Of course, the material of the fire-proof layer 11 is not limited to the material proposed in the present disclosure, as long as it can achieve expansion to form foam upon heat.

In another embodiment provided by the present disclosure, the fire-blocking layer 11 is made of a material that decomposes into non-combustible gases upon heating. When the fireproof layer 11 is heated, non-combustible gas, such as carbon dioxide, nitrogen and the like, can be generated, and the combustible gas decomposed by the heat of the single battery is diluted, so that the single battery is not easy to burn or the burning speed is reduced. Alternatively, the fire-retardant layer 11 may be composed of chlorinated rubber, paraffin and various fire-retardant additives.

As shown in fig. 1 to 5, the liquid-cooled plate body 10 may have a plurality of concave portions 101 which are concave downward, the concave portions 101 extend along the width direction of the liquid-cooled plate 1 wrapped in the battery, the plurality of concave portions 101 are arranged along the length direction of the liquid-cooled plate 1 wrapped in the battery, and the shape and size of the concave portions 101 are configured to be matched with the shape and size of the outer peripheral surface of the unit cell 12, so as to accommodate the unit cell 12 located above the liquid-cooled plate body 10. That is, when the unit cells 12 are cylindrical in shape, the inner walls of the concave portions 101 are formed in an arc shape, and the radius of curvature of the concave portions 101 in the arc shape is substantially equal to the radius of curvature of the unit cells 12, so that when the unit cells 12 are arranged in the concave portions 101, the outer surfaces of the unit cells 12 are adhered to the inner surfaces of the concave portions 101, thereby enhancing the cooling effect of the unit cells 12. When the shape of the unit cell 12 is a cube, the inner wall of the recess 101 is formed in a U shape, and the length and width of the U-shaped space inside the recess 101 substantially coincide with those of the unit cell 12, and the bottom wall and the side wall of the unit cell 12 are arranged in conformity with the inner wall of the recess 101. Of course, the shape of the battery is not limited to the cylindrical shape and the three-dimensional shape, and the shape of the concave portion 101 is not limited to the arc shape and the cube shape, and in short, the shape and the size of the concave portion 101 are matched with the shape and the size of the unit battery 12, so that the inner wall of the concave portion 101 can be attached to the outer surface of the unit battery.

As shown in fig. 1 to 5, the liquid-cooled plate body 10 may further have a plurality of protrusions 102 protruding upward, and the plurality of recesses 101 and the plurality of protrusions 102 are staggered in the length direction so that the liquid-cooled plate body 10 is formed in a wave shape, and the shape and size of the protrusions 102 are configured to match the shape and size of the outer circumferential surface of the unit cell 12 for accommodating the unit cell 12 located below the liquid-cooled plate body 10. That is to say, the battery cell 12 of liquid cooling board upside can be laminated at the depressed part 101 of the upper surface of liquid cooling board plate 10, and the bulge 102 of the lower surface of liquid cooling board plate 10 can be used for laminating with the battery cell 12 of liquid cooling board plate 10 downside, the upper and lower two sides of a liquid cooling board plate 10 all can play cooling's effect to battery cell 12, on the one hand, can reduce the assembly quantity to liquid cooling board plate 10, and therefore, the production cost is reduced, on the other hand, can also play better radiating effect to battery cell 12.

Here, the waveform formed by the liquid cooling plate body 10 may be a sine wave waveform, a square wave waveform, or any other waveform, and the specific shape and size depend on the shape of the unit battery 12 adapted to the shape.

As shown in fig. 3 and 4, for the cylindrical single battery 12, when the plurality of single batteries 12 are respectively and correspondingly arranged in the plurality of concave portions 101, a filling area 20 is defined between the side wall of two adjacent single batteries 12 and the fireproof layer 11, when thermal runaway occurs in the single battery 12, the fireproof paint sprayed on the concave portion 101 of the single battery 12 expands and foams after being heated, and fills the filling area 20 to form a foam heat insulation layer, so that heat and flame transmission are blocked, and the purpose of blocking thermal runaway is achieved. The same is true for the unit cells 12 arranged in the projections 102, and therefore, the description thereof is omitted.

As shown in fig. 2, along the width direction of the battery-packed liquid cooling plate 1, a baffle 104 may be disposed on the side walls of the concave portion 101 and the convex portion 102, and the baffle 104 limits the battery cells 12 in the length direction of the battery-packed liquid cooling plate 1, so as to prevent the battery cells 12 from moving in the length direction of the battery-packed liquid cooling plate 1, thereby improving the stability of the battery cells 12 fixed on the battery-packed liquid cooling plate 1.

As shown in fig. 1, 2 and 5, the liquid-cooling plate body 10 is formed by a plurality of flat tubes 103 arranged in the width direction of the battery pack liquid-cooling plate 1, and each flat tube 103 is hollow inside to form a flow passage through which a cooling liquid flows. That is, the plate-shaped structure formed by the flat tubes 103 is a liquid-cooling plate body, and it can be understood that, in this embodiment, the above-mentioned fire-proof layer 11 is provided on each flat tube 103, and the projection of the fire-proof layer 11 in the up-down direction covers the projection of the flat tubes 103 in the up-down direction. Also, for the embodiment in which concave portions 101 and convex portions 102 are formed on liquid-cooled plate body 10, concave portions 101 and convex portions 102 are formed on flat tubes 103.

It should be noted here that the plurality of flat tubes 103 may be arranged adjacently or at intervals in the width direction of the battery pack liquid cooling plate 1, which is not limited in this disclosure.

In one embodiment provided by the present disclosure, the plurality of flat tubes 103 are arranged at intervals in the width direction of the battery pack liquid cooling plate 1. Under can satisfying the radiating requirement of cooling down to battery cell 12, the flat pipe 103 of interval arrangement can effectively reduce weight and the cost of battery package liquid cold plate 1, also is convenient for to processing, the assembly of liquid cold plate more.

As shown in fig. 1, 3, 4 and 5, the liquid-cooled plate 10 is further provided with an input port 14 and an output port 15 for delivering a cooling liquid and respectively communicating with the flow channels, the cooling liquid enters the flow channels through the input port 14, flows through the flow channels, and transfers heat generated by the unit cells 12 to the outside of the battery pack liquid-cooled plate 1 through the output port 15.

As shown in fig. 1, 3, 4, and 5, the input port 14 and the output port 15 are disposed in the middle of the liquid-cooled plate 10, the liquid-cooled plate 10 is provided at two ends thereof with liquid-collecting pipes 13 respectively communicating with the flow channels, the flow channels include a liquid inlet flow channel and a liquid outlet flow channel, one end of the liquid inlet flow channel communicates with the liquid-collecting pipe 13, the other end of the liquid inlet flow channel communicates with the input port 14, one end of the liquid outlet flow channel communicates with the liquid-collecting pipe 13, the other end of the liquid outlet flow channel communicates with the output port 15, the cooling liquid enters the liquid inlet flow channel through the input port 14, flows into the liquid-collecting pipe 13 through the liquid inlet flow channel, and then flows out from the liquid-collecting.

In one embodiment provided by the present disclosure, the liquid outlet flow channel is disposed on both sides of the liquid inlet flow channel.

According to a second aspect of the present disclosure, a battery pack is provided, which includes the above battery pack liquid cooling plate 1 and the single battery 12, wherein the fire-proof layer 11 of the battery pack liquid cooling plate 1 is clamped between the single battery 12 and the liquid cooling plate body 10 of the battery pack liquid cooling plate 1. The battery pack has all the advantages of the battery pack liquid cooling plate 1, and the details of the disclosure are not repeated herein.

According to a third aspect of the present disclosure, there is provided an electric vehicle including the battery pack as above. This electric motor car has the whole beneficial effect of above-mentioned battery package, and this disclosure does not describe herein any more.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. The utility model provides a battery package liquid cold drawing, its characterized in that includes liquid cold plate body (10) and flame retardant coating (11), liquid cold plate body (10) are used for cooling battery cell (12), flame retardant coating (11) set up on liquid cold plate body (10) and with the laminating of liquid cold plate body (10), flame retardant coating (11) are covered in the ascending projection of direction from top to bottom liquid cold plate body (10) are in ascending projection from top to bottom, flame retardant coating (11) deviate from the surface of liquid cold plate body (10) be used for with the surface laminating of battery cell (12).

2. A liquid-cooled battery pack as claimed in claim 1, wherein the liquid-cooled plate body (10) has first and second outer surfaces opposite in the up-down direction, the first and second outer surfaces each being provided with the fire-resistant layer (11).

3. The liquid cooling plate of battery package according to claim 1, characterized in that, the fire-proof layer (11) is a fire-proof paint sprayed on the liquid cooling plate body (10).

4. The liquid-filled cold plate of claim 1, wherein the fire-resistant layer (11) is made of an intumescent fire-resistant material that expands and foams when heated.

5. The liquid-filled cold plate of claim 1, wherein the fire-resistant layer (11) is made of a material that can decompose non-combustible gases when heated.

6. The liquid cooling plate of claim 1, wherein the liquid cooling plate body (10) has a plurality of downwardly concave depressions (101), the depressions (101) extend along the width direction of the liquid cooling plate (1), the depressions (101) are arranged along the length direction of the liquid cooling plate (1), and the depressions (101) are shaped and sized to match the shape and size of the outer peripheral surfaces of the individual batteries (12) for receiving the individual batteries (12) above the liquid cooling plate body (10).

7. The battery pack liquid cooling plate of claim 6, wherein the liquid cooling plate body (10) further has a plurality of upwardly convex protrusions (102), the plurality of depressions (101) and the plurality of protrusions (102) are staggered along the length direction to form the liquid cooling plate body (10) into a wave shape, and the protrusions (102) are shaped and sized to fit the shape and size of the outer peripheral surface of the individual battery (12) for receiving the individual battery (12) located below the liquid cooling plate body (10).

8. A liquid-cooled plate for a battery pack according to any one of claims 1 to 7, wherein the liquid-cooled plate body (10) is formed by a plurality of flat tubes (103) arranged in the width direction of the liquid-cooled plate (1) for a battery pack, and each flat tube (103) is hollow inside to form a flow passage through which a cooling liquid flows.

9. A battery pack, comprising a battery pack liquid cooling plate (1) according to any one of claims 1 to 8 and a battery cell (12), wherein the fire-proof layer (11) of the battery pack liquid cooling plate (1) is clamped between the battery cell (12) and the liquid cooling plate body (10) of the battery pack liquid cooling plate (1).

10. An electric vehicle comprising the battery pack according to claim 9.