Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment, the battery pack comprises a battery module, a cooling plate and a box body, and the cooling plate is used for supporting the battery module. The box body covers the cooling plate, and the battery module is arranged in the accommodating chamber. Wherein the battery module comprises a plurality of battery cell single bodies and air guide pieces arranged between every two adjacent battery cell single bodies, the battery cell single bodies and the air guide pieces face the cooling plate, and first air channels are formed in the air guide pieces. Compared with the prior art, air cooling is added on the basis of bottom liquid cooling, and the air guide piece is arranged between every two adjacent battery cell monomers, so that airflow can flow in the direction perpendicular to the cooling plate to cool each battery cell monomer, the temperature difference of the battery module is reduced, and the heat dissipation efficiency of the battery module is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery pack and an electrical device. Background Art

[0002] Batteries may pose safety risks under high-temperature conditions. For example, overheating may cause the battery to experience thermal runaway, combustion, or even explosion. In related technologies, a liquid cooling plate is provided inside the battery to cool the battery. The liquid cooling plate is usually arranged at the bottom of the battery. However, the heat dissipation efficiency of the method of only arranging the liquid cooling plate at the bottom is low, and it cannot ensure that the battery remains in the optimal working state during use. Utility Model Content

[0003] Embodiments of this application provide a battery pack and an electrical device, which can improve the technical problem of low battery heat dissipation efficiency.

[0004] In a first aspect, embodiments of this application provide a battery pack, including:

[0005] A battery module;

[0006] A cooling plate for supporting the battery module;

[0007] A box body covering the cooling plate to form an accommodation chamber, and the battery module is arranged in the accommodation chamber;

[0008] Wherein, the battery module includes a plurality of battery cells and a wind guiding member arranged between two adjacent battery cells. The battery cells and the wind guiding member are perpendicular to the cooling plate. A first air duct is provided in the wind guiding member, and the first air duct penetrates the wind guiding member along the direction perpendicular to the cooling plate.

[0009] In some embodiments, a gap is formed between the bottom end of the wind guiding member and the cooling plate, and the first air duct communicates the gap and the accommodation chamber.

[0010] In some embodiments, the wind guiding member is attached to the larger-surface side of the two adjacent battery cells.

[0011] In some embodiments, the box body includes a top plate and a partition plate. The partition plate is arranged at intervals on the side of the top plate facing the cooling plate, and forms a wind chamber with the top plate. The partition plate is provided with a plurality of first air guiding holes communicating the wind chamber and the first air duct.

[0012] In some embodiments, the projection of the partition plate on the cooling plate is larger than the projection of the battery module on the cooling plate.

[0013] In some embodiments, the box body includes a first side panel, one end of the first side panel is connected to the cooling plate, the other end of the first side panel is connected to the partition and / or the top plate, and a first air outlet is provided at one end of the first side panel away from the cooling plate, and the first air outlet is connected to the air cavity.

[0014] In some embodiments, the first air duct extends from one end of the battery cell where the pole is mounted to the bottom end of the battery cell.

[0015] In some embodiments, the box body includes a second side plate, the second side plate and the first side plate are arranged opposite to each other, and a second air outlet is provided at one end of the second side plate close to the cooling plate, and the second air outlet is connected to the accommodating chamber.

[0016] In some embodiments, the box body includes a first side plate, one end of the first side plate is connected to the cooling plate, and the other end is connected to the top plate. The battery pack also includes a connecting plate, which is arranged in the box body and surrounded by the top plate and the partition to form the wind cavity. The connecting plate is spaced apart from the first side plate, and the connecting plate is provided with a second air guide hole connecting the wind cavity and the accommodating chamber.

[0017] In some embodiments, the battery pack also includes a fan, which is installed on the top plate and located on the side of the connecting plate away from the wind cavity. The fan includes an air inlet end and an air outlet end, the air inlet end faces the second air guide hole, and the air outlet end faces the cooling plate.

[0018] In some embodiments, the battery module and the first side plate are spaced apart to form an air passage, and the air outlet faces the air passage.

[0019] In some embodiments, the cooling plate includes a base plate and a plurality of fins, the plurality of fins are disposed on a side of the base plate facing the battery module, and any two adjacent fins form a second air duct, and the second air duct is connected to the first air duct.

[0020] In a second aspect, the present application also provides an electrical device, comprising a battery pack as described above.

[0021] Beneficial effects of the embodiments of the present application:

[0022] In an embodiment of the present application, the battery pack includes a battery module, a cooling plate, and a box body. The cooling plate is used to support the battery module, that is, liquid cooling is used to cool the bottom of the battery module through the cooling plate. The box body is covered on the cooling plate to form an accommodation chamber, and the battery module is arranged in the accommodation chamber. Among them, the battery module includes a plurality of battery cells and a wind guiding member disposed between two adjacent battery cells. The battery cells and the wind guiding member face the cooling plate, and a first air duct is provided in the wind guiding member. The first air duct penetrates the wind guiding member along the direction perpendicular to the cooling plate. The first air duct can make the air flow along the direction towards the cooling plate to cool the sides of the battery cells. By using the cooling plate to perform liquid cooling on the bottom of the battery module and at the same time using the first air duct to cool the sides of the battery cells in the battery module, the temperature difference of the battery module can be better reduced, and the heat dissipation efficiency of the battery module can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 is a schematic structural diagram of the battery pack provided by the embodiment of the present application;

[0025] Figure 2 is Figure 1 an exploded schematic diagram of the battery pack shown;

[0026] Figure 3 is Figure 2 a schematic structural diagram of the wind guiding member in the battery pack shown;

[0027] Figure 4 is Figure 1 a cross-sectional schematic diagram of the battery pack shown Figure 1 ;

[0028] Figure 5 is another schematic structural diagram of the battery pack provided by the embodiment of the present application;

[0029] Figure 6 is Figure 5 an exploded schematic diagram of the battery pack shown;

[0030] Figure 7 is Figure 6 a schematic diagram of a partial structure in the battery pack shown;

[0031] Figure 8 is Figure 5 a cross-sectional schematic diagram of the battery pack shown;

[0032] Figure 9 is Figure 6 a schematic structural view of a cooling plate in the battery pack shown

[0033] Reference numerals:

[0034] 100, battery pack;

[0035] 10, battery module; 11, single battery cell; 12, end plate; 13, insulating sheet;

[0036] 20, cooling plate; 21, bottom plate; 22, fin; 221, second air duct;

[0037] 30, box body; 301, accommodation chamber; 31, top plate; 32, partition; 320, air cavity; 321, first air guiding hole; 33, first side plate; 331, first air inlet; 34, second side plate; 341, second air inlet; 35, connecting plate; 351, second air guiding hole;

[0038] 40, air guiding member; 41, gap; 42, first air duct;

[0039] 50, fan; 51, air passing channel. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to explain and illustrate the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; and "inner" and "outer" refer to the outline of the device.

[0041] Please refer to Figures 1 - 3 , Figure 1 which is a schematic structural view of a battery pack provided by an embodiment of the present application, Figure 2 is Figure 1 the explosion schematic of the battery pack shown Figure 1 , Figure 3 is Figure 2Schematic structural diagram of the air guide member shown. The present application provides a battery pack 100, which includes a battery module 10, a cooling plate 20, and a box body 30. The cooling plate 20 is used to support the battery module 10, that is, the bottom of the battery module 10 is cooled by liquid cooling through the cooling plate 20. Among them, the cooling plate 20 can be an integrated liquid cooling bottom plate structure of the cooling plate and the bottom plate of the box body, or a detachable structure of the cooling plate and the bottom plate of the box body. The box body 30 covers the cooling plate 20 to form a containing chamber 301, and the battery module 10 is arranged in the containing chamber 301. Among them, the battery module 10 includes a plurality of battery cell monomers 11 and an air guide member 40 arranged between two adjacent battery cell monomers 11. The battery cell monomers 11 and the air guide member 40 face the cooling plate 20. A first air duct 42 is provided in the air guide member 40, and the first air duct 42 penetrates through the air guide member 40 along the direction towards the cooling plate 20. In the prior art, the liquid cooling plate is usually arranged at the bottom of the battery. However, the heat dissipation efficiency of this method is relatively low, and it is impossible to ensure that the battery remains in the best working state during use. Compared with the prior art, the present application adds air cooling on the basis of bottom liquid cooling, and an air guide member 40 is arranged between two adjacent battery cell monomers 11, so that the air flow can flow along the direction towards the cooling plate 20 to cool the sides of each battery cell monomer 11. The bottom of the battery module 10 is cooled by liquid cooling through the cooling plate 20, and at the same time, the sides of the battery cell monomers 11 in the battery module are cooled through the first air duct 42, which can reduce the temperature difference of the battery module 10, improve the heat dissipation effect of the battery module 10, prevent the battery pack 100 from thermal runaway, and improve the safety of the battery pack 100.

[0042] In some embodiments, a gap 41 is formed between the bottom end of the air guide member 40 and the cooling plate 20, and the first air duct communicates with the gap 41 and the containing chamber 301. It can be understood that setting the gap 41 at the bottom can enable the air flow to fully flow between the cooling plate 20 and the containing chamber 301. In some examples, a number of through holes are provided on the surface of the air guide member 40, and the air flow can flow out of the first air duct 42 through the through holes and re-enter the containing chamber.

[0043] In some embodiments, the air guide member 40 is attached to the side surface with a larger surface area of the battery cell monomers 11 on both sides. The air guide member 40 is attached to the battery cell monomers 11, which can utilize the space between the battery cell monomers 11 to further reduce the distance between the first air duct 42 and the battery cell monomers 11.

[0044] Specifically, each battery cell 11 includes a first side surface and a second side surface that are oppositely arranged, and the area of the first side surface is larger than that of the second side surface. The air guiding member 40 can be attached between the first side surfaces of two adjacent battery cells 11, or can also be attached between the second side surfaces of two adjacent battery cells 11. It can be understood that since the area of the first side surface is larger than that of the second side surface, when the air guiding member 40 is attached between the first side surfaces of adjacent battery cells 11, the contact area with the battery cells 11 is larger, and the heat dissipation effect is better, which can further improve the heat dissipation efficiency of the battery cells 11.

[0045] The prior art mostly adopts large-area liquid cooling, that is, the area of the liquid cooling plate is equal to the side area of the battery module. However, for square battery cells, the overall expansion force of the battery cells will affect the liquid cooling pipeline. It can be understood that each air guiding member 40 is attached to the battery cells 11 on both sides, and when the air flow passes through the first air duct 42, the battery cells on both sides of the air guiding member 40 can be cooled, and the overall expansion of the battery cells during large-area liquid cooling can be avoided from squeezing the liquid cooling pipeline.

[0046] In some embodiments, the air guiding member 40 can be an aluminum part, and the aluminum part can have a good heat dissipation effect. When the air flow passes through the air guiding member 40, the working temperature of the battery can be reduced. In addition, the aluminum part has a certain structural stability, which helps to reduce the movement or looseness of the internal components of the battery when facing external forces or vibrations. The air guiding member 40 can also be other metal structures, which are not limited in this application.

[0047] Please refer to Figure 4 , Figure 4 is Figure 1 the cross-sectional schematic of the battery pack shown Figure 1 。In some embodiments, the box body 30 includes a top plate 31 and a partition plate 32. The partition plate 32 is disposed at an interval on the side of the top plate 31 facing the cooling plate 20, and forms an air cavity 320 with the top plate 31. The partition plate 32 is provided with a plurality of first air guiding holes 321 communicating the air cavity 320 and the first air duct 42.

[0048] In the prior art, some batteries adopt bottom and top liquid cooling, that is, a liquid cooling plate is respectively arranged at the bottom and the top. However, in this method, the top liquid cooling plate can only be connected to the aluminum row of the battery module through thermal conductive glue. Although the temperature of the aluminum row is reduced, the temperature of the battery module is still relatively high. At the same time, the two liquid cooling plates will increase the manufacturing cost. In this application, by arranging the partition plate 32 at the top, the partition plate 32 and the top plate 31 form an air cavity 320, so that the air flow can flow in the air cavity 320 and enter the battery module 10 through the air cavity 320, without the need to arrange multiple liquid cooling plates, with a simple structure and low cost, which is beneficial to production, processing and installation.

[0049] In some embodiments, the projection of the partition 32 on the cooling plate 20 is larger than the projection of the battery module 10 on the cooling plate 20. It can be understood that the area of the partition 32 is larger than the area of the battery module 10, which can ensure that after the air flow enters the air cavity 320, no matter which end of the partition 32 it enters the accommodation chamber 301 from, the cold air flow can cool the battery module 10.

[0050] In some embodiments, the first air guiding holes 321 are uniformly arranged on the shelf. Specifically, the partition 32 includes a long side and a short side. In some examples, the first air guiding holes 321 are arranged at intervals along the long side. In some examples, the first air guiding holes 321 are arranged at intervals along the short side. The first air guiding holes 321 can be circular, strip-shaped, square, etc. The present application does not limit the specific shape of the first air guiding holes 321. When the air guiding member 40 is arranged between adjacent battery cells 11, the first air guiding holes 321 are uniformly distributed on the shelf, which is beneficial to the uniform inflow of the circulating air into the first air duct 42.

[0051] In some embodiments, the box body 30 includes a first side plate 33. One end of the first side plate 33 is connected to the cooling plate 20, and the other end of the first side plate 33 is connected to the partition 32 and / or the top plate 31. A first air inlet 331 is provided at the end of the first side plate 33 away from the cooling plate 20, and the first air inlet 331 communicates with the air cavity 320.

[0052] It can be understood that the other end of the first side can be connected to the partition 32 and connected to the top plate 31, or can be connected to one of the partition 32 and the top plate 31. The present application does not make a limitation here.

[0053] In some embodiments, the first air duct 42 extends from the end of the battery cell 11 where the pole post is installed to the bottom end of the battery cell 11. It can be understood that the heat generated by the pole post at the top end of the battery cell 11 and the bus bar connected to the pole post is relatively large. The first air duct 42 extends from the top end to the bottom end, which can better transfer the heat generated at the top end of the battery cell 11 and direct the heat to the bottom cooling plate 20 to improve the heat dissipation effect.

[0054] In some embodiments, the box body 30 includes a second side plate 34. The second side plate 34 is arranged opposite to the first side plate 33. A second air inlet 341 is provided at the end of the second side plate 34 close to the cooling plate 20, and the second air inlet 341 communicates with the accommodation chamber 301.

[0055] It can be understood that the partition plate 32 and the top plate 31 are arranged at intervals. One end of the first side plate 33 and the second side plate 34 away from the cooling plate 20 is connected to the partition plate 32 and the top plate 31. The first side plate 33 and the second side plate 34 are arranged on both sides of the partition plate 32. The partition plate 32 and the top plate 31 form an air cavity 320. The first air inlet 331 is located between the top plate 31 and the partition plate 32. The battery pack 100 can be provided with a plurality of first air inlets 331 so that air flow enters the air cavity 320 from the plurality of first air inlets 331.

[0056] In some embodiments, end plates 12 are respectively arranged on both sides of the battery module 10. The end plates 12 are arranged on one side of the battery module 10 facing the first side plate 33 and the second side plate 34. The length of the end plates 12 is shorter than the length of the battery cells 11. The cooling plate 20 further includes a cross beam. The cross beam protrudes into the space between the end plates 12 and the cooling plate 20. The cross beam is provided with an opening. Air flow can enter or flow out of the battery module 10 along the opening of the cross beam. An insulating sheet 13 is arranged between each end plate 12 and each battery cell 11 to improve the safety of the battery cells 11.

[0057] In some embodiments, an insulating paint is coated on one side of each air guiding member 40 facing the battery cell 11. The insulating paint has good high temperature resistance and corrosion resistance, and can provide electrical insulation and protection between the battery cell 11 and the air guiding member 40.

[0058] In some embodiments, the first air inlet 331 is an air inlet and the second air outlet 341 is an air outlet. Cold air is introduced into the battery pack 100 from the first air inlet 331 and flows into the top air cavity 320. Then it flows downward through the first air duct 42 to dissipate heat from the side surfaces of the air guiding member 40 and the battery cells 11. Finally, it flows out from the second air outlet 341 to complete the air cooling external circulation.

[0059] Please refer to Figures 5 - 7 , Figure 5 which is another structural schematic diagram of the battery pack provided by the embodiment of the present application, Figure 6 is Figure 5 the explosion schematic diagram of the battery pack shown in Figure 7 is Figure 6 the partial structural schematic diagram of the battery pack shown in . In some embodiments, the box body 30 includes a first side plate 33 close to the fan 50. One end of the first side plate 33 is connected to the cooling plate 20 and the other end is connected to the top plate 31. The battery pack 100 further includes a connecting plate 35. The connecting plate 35 is arranged in the box body 30 and surrounds between the top plate 31 and the partition plate 32 to form the air cavity 320. The connecting plate 35 is arranged at intervals with the first side plate 33. The connecting plate 35 is provided with a second air guiding hole 351 communicating the air cavity 320 and the accommodation chamber 301.

[0060] Please refer to Figure 8 ,Figure 8 yes Figure 5 The cross-section diagram of the battery pack shown Figure 2 In some embodiments, the battery pack 100 further includes a fan 50 , which is mounted on the top plate 31 and located on a side of the connecting plate 35 away from the air cavity 320 , and includes an air inlet end and an air outlet end, wherein the air inlet end faces the second air guide hole 351 , and the air outlet end faces the cooling plate 20 .

[0061] In some examples, the fan 50 further includes a motor and an impeller, the impeller is disposed in the chamber of the fan 50, the motor is connected to the impeller, and the impeller rotates to cause the airflow to flow from the air inlet to the air outlet. The fan 50 can be fixedly connected to the first side wall, or fixedly connected to the top plate 31. The number of fans 50 includes 2, 3, 4, etc., and the number can be set according to the size of the accommodating chamber 301 and the heat dissipation requirements.

[0062] In some embodiments, the battery module 10 and the first side plate 33 are spaced apart to form an air passage 51 , and the air outlet faces the air passage 51 .

[0063] It can be understood that the airflow is cooled when passing through the cooling plate 20, and enters the air cavity 320 from the first air duct 42 between the battery cells 11 through the multiple first air guide holes 321, and then enters the fan 50 from the second air guide hole 351, and flows back to the cooling plate 20 in the direction of the air passage 51, completing the air cooling internal circulation. The entire circulation process is inside the battery pack 100, which will not affect the sealing of the battery pack 100, and balances the temperature of the battery cells in the pack during the cold air circulation process.

[0064] Please refer to Figure 9 , Figure 9 yes Figure 6 The schematic diagram of the structure of the cooling plate of the battery pack shown in FIG. In some embodiments, the cooling plate 20 includes a bottom plate 21 and a plurality of fins 22, wherein the plurality of fins 22 are arranged on a side of the bottom plate 21 facing the battery module 10, and any two adjacent fins 22 form a second air duct 221, and the second air duct 221 is connected to the first air duct 42. When the air flows through the second air duct 221, it contacts and exchanges heat with the surface of the plurality of fins 22. The provision of the fins 22 can increase the contact area between the air and the cooling plate 20, thereby improving the heat dissipation efficiency of the cooling plate 20 to the air in the battery pack 100.

[0065] Specifically, the extending direction of the fin 22 is consistent with the direction of the long side of the cooling plate 20. A plurality of fins 22 may be provided, and each fin 22 is perpendicular to the bottom plate 21. The intervals between the plurality of fins 22 may be the same or different. The height of the fin 22 may be set to be less than the height of the upper beam opening of the cooling plate 20. Under the guiding action of the fin 22, the air flow can flow from one end of the cooling plate 20 to the other end along the fin 22.

[0066] The present application also provides an electrical device, which includes the aforementioned battery pack 100. The battery pack 100 can be used as the power source or energy storage unit of the electrical device. The electrical device can be a mobile device (such as a mobile phone, a laptop computer, etc.), a vehicle (such as an electric vehicle, a hybrid vehicle, etc.), a medical device (such as a pacemaker, a hearing aid, etc.), a power device (such as a saw, a lawn mower, etc.). The present application does not make any limitation here.

[0067] The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A battery pack, characterized in that, include: Battery module; A cooling plate for supporting the battery module; A box body, which is covered on the cooling plate to form a receiving chamber, and the battery module is arranged in the receiving chamber; Among them, the battery module includes a plurality of battery cells and an air guide arranged between adjacent battery cells, the battery cells and the air guide face the cooling plate, a first air duct is arranged in the air guide, and the first air duct passes through the air guide in the direction toward the cooling plate.

2. The battery pack according to claim 1, wherein A gap is formed between the bottom end of the air guide and the cooling plate, and the first air duct communicates with the gap and the accommodating chamber.

3. The battery pack according to claim 1, wherein The air guide is attached to the side surfaces of the battery cell monomers on both sides with larger surface areas.

4. The battery pack according to claim 1, wherein, The box body includes a top plate and a partition plate, wherein the partition plate is arranged at a distance from the top plate on a side facing the cooling plate and forms an air cavity with the top plate, and the partition plate is provided with a plurality of first air guide holes connecting the air cavity and the first air duct.

5. The battery pack according to claim 4, characterized in that, The projection of the partition on the cooling plate is larger than the projection of the battery module on the cooling plate.

6. The battery pack according to any one of claims 4-5, characterized in that, The box body includes a first side plate, one end of the first side plate is connected to the cooling plate, the other end of the first side plate is connected to the partition plate and / or the top plate, and a first air outlet is provided at one end of the first side plate away from the cooling plate, and the first air outlet is connected to the air cavity.

7. The battery pack according to claim 6, wherein The first air duct extends from one end of the battery cell where the pole is installed to the bottom end of the battery cell.

8. The battery pack according to claim 6, characterized in that, The box body includes a second side plate, the second side plate is arranged opposite to the first side plate, and a second air outlet is provided at one end of the second side plate close to the cooling plate, and the second air outlet is connected to the accommodating chamber.

9. The battery pack according to any one of claims 4-5, characterized in that, The box body includes a first side plate, one end of which is connected to the cooling plate, and the other end is connected to the top plate. The battery pack also includes a connecting plate, which is arranged in the box body and surrounded by the top plate and the partition to form the wind cavity. The connecting plate is spaced apart from the first side plate, and the connecting plate is provided with a second air guide hole connecting the wind cavity and the accommodating chamber.

10. The battery pack according to claim 9, wherein The battery pack also includes a fan, which is installed on the top plate and located on the side of the connecting plate away from the air cavity. The fan includes an air inlet end and an air outlet end, the air inlet end faces the second air guide hole, and the air outlet end faces the cooling plate.

11. The battery pack according to claim 10, characterized in that, The battery module and the first side plate are spaced apart to form an air passage, and the air outlet faces the air passage.

12. The battery pack according to claim 1, characterized in that, The cooling plate includes a bottom plate and a plurality of fins, wherein the plurality of fins are arranged on a side of the bottom plate facing the battery module, and any two adjacent fins form a second air duct, and the second air duct is connected to the first air duct.

13. An electrical device, characterized in that, Comprising a battery pack as described in any one of claims 1-12.

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