Battery pack and electric device

Abstract

Provided in the present application are a battery pack and an electric device. The battery pack comprises a battery module, a cooling plate and a casing, wherein the cooling plate is configured to support the battery module; the casing covers the cooling plate, and the battery module is arranged in an accommodating chamber; and the battery module comprises a plurality of battery cell units and air guide members arranged between every two adjacent battery cell units, the battery cell units and the air guide members facing the cooling plate, and a first air duct being provided inside each air guide member.

Description

Battery pack and electric device

[0001]

[0002] The present application claims priority to the Chinese patent application No. 202421978845.3, filed on August 14, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery pack and an electric device. BACKGROUND

[0004] The battery may have a safety risk under high temperature condition, for example, the battery may have thermal runaway, combustion or even explosion due to overheating. In the related art, a liquid cooling plate is arranged in the battery to cool the battery, and the liquid cooling plate is usually arranged at the bottom of the battery. SUMMARY

[0005] However, the method of arranging the liquid cooling plate only at the bottom of the battery has low heat dissipation efficiency, and cannot guarantee that the battery remains in the best working state during use.

[0006] The present application provides a battery pack, comprising: a battery module; a cooling plate configured to support the battery module; a box body covered on the cooling plate to form an accommodation cavity, the battery module being arranged in the accommodation cavity; wherein the battery module comprises a plurality of battery cells and a wind guide arranged between two adjacent battery cells, the battery cells and the wind guide being perpendicular to the cooling plate, the wind guide being provided with a first air duct, the first air duct penetrating through the wind guide along a direction perpendicular to the cooling plate.

[0007] The present application also provides an electric device comprising the battery pack as described above. ADVANTAGEOUS EFFECTS

[0008] The battery pack provided by the present application comprises a battery module, a cooling plate and a box body, the cooling plate is configured to support the battery module, that is, the bottom of the battery module is subjected to liquid cooling by the cooling plate. The box body is covered on the cooling plate to form an accommodation cavity, and the battery module is arranged in the accommodation cavity. The battery module comprises a plurality of battery cells and a wind guide arranged between two adjacent battery cells, the battery cells and the wind guide being perpendicular to the cooling plate, the wind guide being provided with a first air duct, the first air duct penetrating through the wind guide along a direction perpendicular to the cooling plate. The first air duct can make the airflow flow along the direction towards the cooling plate to cool the side surface of the battery cell. By subjecting the bottom of the battery module to liquid cooling by the cooling plate and simultaneously subjecting the side surface of the battery cell in the battery module to cooling by the first air duct, 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 DRAWINGS

[0009] Fig. 1 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0010] Fig. 2 is an exploded schematic diagram of the battery pack shown in Fig. 1;

[0011] Fig. 3 is a structural schematic diagram of a wind guide shown in the battery pack shown in Fig. 2;

[0012] Fig. 4 is a sectional schematic diagram of the battery pack shown in Fig. 1;

[0013] Fig. 5 is another structural schematic diagram of a battery pack according to an embodiment of the present application;

[0014] Fig. 6 is an exploded schematic diagram of the battery pack shown in Fig. 5;

[0015] Fig. 7 is a partial structural schematic diagram of the battery pack shown in Fig. 6;

[0016] Fig. 8 is a sectional schematic diagram of the battery pack shown in Fig. 5;

[0017] Fig. 9 is a structural schematic diagram of a cooling plate shown in the battery pack shown in Fig. 6.

[0018] Legend of reference signs:

[0019] 100, battery pack;

[0020] 10, battery module; 11, battery cell; 12, end plate; 13, insulating sheet;

[0021] 20, cooling plate; 21, bottom plate; 22, fin; 221, second air duct;

[0022] 30, box; 301, accommodating chamber; 31, top plate; 32, partition plate; 320, air cavity; 321, first air guide hole; 33, first side plate; 331, first air port; 34, second side plate; 341, second air port; 35, connecting plate; 351, second air guide hole;

[0023] 40, wind guide; 41, gap; 42, first air duct;

[0024] 50, fan; 51, air passing channel. Embodiments of the present application

[0025] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless specifically stated and limited otherwise, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of the present embodiment, the terms "upper", "lower", "left", "right", "front", "back" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are used to distinguish in the description, and have no special meaning.

[0028] Please refer to FIG. 1-3, FIG. 1 is a structural schematic diagram of a battery pack provided by an embodiment of the present application, FIG. 2 is an exploded schematic diagram of the battery pack shown in FIG. 1, and FIG. 3 is a structural schematic diagram of a wind guide shown in FIG. 2. The present application provides a battery pack 100, which comprises a battery module 10, a cooling plate 20 and a box 30. The cooling plate 20 is configured to support the battery module 10, that is, the bottom of the battery module 10 is subjected to liquid cooling by the cooling plate 20. The cooling plate 20 can be a liquid-cooled bottom plate structure integrated with the bottom plate of the box, or can be a structure in which the cooling plate and the bottom plate of the box are detachable. The box 30 is provided on the cooling plate 20 to form a containing chamber 301, and the battery module 10 is arranged in the containing chamber 301. The battery module 10 comprises a plurality of battery cells 11 and a wind guide 40 arranged between two adjacent battery cells 11, and the battery cells 11 and the wind guide 40 are directed towards the cooling plate 20. The wind guide 40 is provided with a first air duct 42, and the first air duct 42 penetrates the wind guide 40 in a 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 low, and it cannot guarantee that the battery remains in the best working state during use. Compared with the prior art, the present application increases air cooling on the basis of bottom liquid cooling, and the wind guide 40 is arranged between two adjacent battery cells 11, so that the airflow can flow in a direction towards the cooling plate 20 to cool the side surface of each battery cell 11. By liquid cooling the bottom of the battery module 10 through the cooling plate 20 and cooling the side surface of the battery cell 11 in the battery module 10 through the first air duct 42, the temperature difference of the battery module 10 can be reduced, the heat dissipation effect of the battery module 10 can be improved, and the safety of the battery pack 100 can be improved.

[0029] In some embodiments, a gap 41 is formed between the bottom end of the wind guide 40 and the cooling plate 20, and the first air duct 42 communicates the gap 41 and the containing chamber 301. It can be understood that the gap 41 arranged at the bottom can make the airflow fully flow between the cooling plate 20 and the containing chamber 301. In some examples, a plurality of through holes are arranged on the surface of the wind guide 40, and the airflow can flow out of the first air duct 42 through the through holes and re-enter the containing chamber 301.

[0030] In some embodiments, each battery cell 11 comprises two first sides arranged oppositely and two second sides arranged oppositely, the area of the first side is greater than the area of the second side, and the wind guide 40 is attached to the first side of the battery cell on both sides. The wind guide 40 is attached to the battery cell 11, which can utilize the space between the battery cells 11, and can reduce the distance between the first air duct 42 and the battery cell 11.

[0031] Specifically, each battery cell monomer 11 includes two oppositely arranged first sides and two oppositely arranged second sides, the area of the first side is larger than the area of the second side, the air guide piece 40 can be attached between the first sides of the adjacent two battery cell monomers 11, or can be attached between the second sides of the adjacent two battery cell monomers 11. It can be understood that, since the area of the first side is larger than the area of the second side, when the air guide piece 40 is attached between the first sides of the adjacent battery cell monomers 11, the contact area with the battery cell monomers 11 is larger, the heat dissipation effect is better, and the heat dissipation efficiency of the battery cell monomers 11 can be improved.

[0032] The prior art mostly uses large-area liquid cooling, that is, the area of the liquid cooling plate is equal to the area of the side 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, since each air guide piece 40 is attached to the battery cell monomers 11 on both sides, the air guide piece 40 can cool the battery cell monomers 11 on both sides when the air flows through the first air duct 42, and the overall expansion of the battery cells can be avoided when the liquid cooling pipeline is squeezed.

[0033] In some embodiments, the air guide piece 40 can be an aluminum piece, which has good heat dissipation effect. When the air flows through the air guide piece 40, the working temperature of the battery can be reduced. In addition, the aluminum piece has certain structural stability, which helps to reduce the movement or loosening of the internal components of the battery when facing external forces or vibrations. The air guide piece 40 can also be made of other metal materials, which is not limited in the present application.

[0034] Please refer to FIG. 4, which is a cross-sectional view of the battery pack shown in FIG. 1. In some embodiments, the box 30 includes a top plate 31 and a partition plate 32, the partition plate 32 is arranged 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 guide holes 321 which communicate the air cavity 320 and the first air duct 42.

[0035] In the prior art, some batteries use bottom and top liquid cooling, that is, a liquid cooling plate is arranged on the bottom and the top respectively. However, the top liquid cooling plate can only be connected with the aluminum row of the battery module through the thermal conductive adhesive, although the temperature of the aluminum row is reduced, the temperature of the battery module is still high, and two liquid cooling plates increase the manufacturing cost. The present application sets the partition plate 32 on the top, and the partition plate 32 and the top plate 31 form the 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 set multiple liquid cooling plates, which is simple in structure and low in cost, and is conducive to production, processing and installation.

[0036] In some embodiments, the area of the orthographic projection of the baffle 32 is greater than the area of the orthographic projection of the battery module 10 on the cooling plate 20. It can be understood that the area of the orthographic projection of the baffle 32 being greater than the area of the orthographic projection of the battery module 10 can ensure that, after the airflow enters the air cavity 320, the cold airflow can cool the battery module 10 regardless of which end of the baffle 32 enters the containing chamber 301.

[0037] In some embodiments, the first air guide hole 321 is uniformly arranged on the baffle 32. Specifically, the baffle 32 includes a long side and a short side. In some examples, the first air guide hole 321 is arranged along the long side. In some examples, the first air guide hole 321 is arranged along the short side. The first air guide hole 321 can be circular, long strip-shaped, square, etc. The specific shape of the first air guide hole 321 is not limited in the present application. When the air guide piece 40 is arranged between adjacent battery monomers 11, the first air guide hole 321 is uniformly distributed on the baffle 32, which is conducive to the uniform inflow of the circulating air into the first air duct 42.

[0038] In some embodiments, the box 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 baffle 32 and / or the top plate 31. The first side plate 33 is provided with a first air port 331 at the end away from the cooling plate 20, and the first air port 331 is connected to the air cavity 320.

[0039] It can be understood that the other end of the first side plate 33 can be connected to the baffle 32 and the top plate 31, or connected to one of the baffle 32 and the top plate 31. The present application does not limit this.

[0040] In some embodiments, the first air duct 42 extends from the end of the battery monomer 11 where the pole is installed to the bottom end of the battery monomer 11. It can be understood that the pole at the top end of the battery monomer 11 and the bus bar connected to the pole generate a large amount of heat. 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 monomer 11 and guide the heat to the bottom cooling plate 20, thereby improving the heat dissipation effect.

[0041] In some embodiments, the box 30 includes a second side plate 34. The second side plate 34 is arranged opposite to the first side plate 33. The second side plate 34 is provided with a second air port 341 at the end close to the cooling plate 20, and the second air port 341 is connected to the containing chamber 301.

[0042] It can be understood that the partition plate 32 and the top plate 31 are spaced apart, the first side plate 33 and the second side plate 34 are connected to the partition plate 32 and the top plate 31 away from one end of the cooling plate 20, 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 the air cavity 320, the first air port 331 is located between the top plate 31 and the partition plate 32, and the battery pack 100 can be provided with a plurality of first air ports 331, so that the airflow enters the air cavity 320 from the plurality of first air ports 331.

[0043] In some embodiments, the battery module 10 is provided with an end plate 12 on each side, the end plate 12 is arranged on the side of the battery module 10 facing the first side plate 33 and the second side plate 34, and the length of the end plate 12 is shorter than the length of the battery cell monomer 11. The cooling plate 20 further comprises a cross beam protruding from the space between the end plate 12 and the cooling plate 20, the cross beam is provided with an opening, and the airflow 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 monomer 11 to improve the safety of the battery cell monomer 11.

[0044] In some embodiments, one side of each air guide 40 facing the battery cell monomer 11 is coated with insulating paint, which has good high-temperature resistance and corrosion resistance, and can provide electrical insulation and protection between the battery cell monomer 11 and the air guide 40.

[0045] In some embodiments, the first air port 331 is an air inlet, and the second air port 341 is an air outlet. The cold air outside the battery pack 100 enters from the first air port 331, flows into the top air cavity 320, then flows downward through the first air duct 42, cools the side of the air guide 40 and the battery cell monomer 11, and finally flows out from the second air port 341, completing the air cooling external circulation.

[0046] Please refer to FIG. 5-7, FIG. 5 is another structure schematic diagram of the battery pack provided by the embodiments of the present application, FIG. 6 is an exploded schematic diagram of the battery pack shown in FIG. 5, and FIG. 7 is a partial structure schematic diagram of the battery pack shown in FIG. 6. In some embodiments, the box 30 comprises 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 comprises a connecting plate 35 arranged in the box 30 and surrounding between the top plate 31 and the partition plate 32 to form the air cavity 320, the connecting plate 35 is spaced apart from the first side plate 33, and the connecting plate 35 is provided with a second air guide hole 351 communicating the air cavity 320 and the accommodating chamber 301.

[0047] Referring to FIG. 8, FIG. 8 is a cross-sectional view of the battery pack shown in FIG. 5. In some embodiments, the battery pack 100 further comprises a fan 50, which is mounted on the top plate 31 and located on the side of the connecting plate 35 away from the air cavity 320. The fan 50 comprises an air inlet end and an air outlet end, the air inlet end faces the second air guide hole 351, and the air outlet end faces the cooling plate 20.

[0048] In some examples, the fan 50 further comprises a motor and an impeller, the impeller is arranged in the chamber of the fan 50, and the motor is connected to the impeller. The impeller rotates to promote the flow of air from the air inlet end to the air outlet end. The fan 50 can be fixedly connected to the first side wall or the top plate 31. The number of fans 50 can be 2, 3, 4, etc., which can be set according to the size of the containing cavity 301 and the heat dissipation requirement.

[0049] In some embodiments, the battery module 10 and the first side plate 33 are arranged at intervals to form an air passing channel 51, and the air outlet end faces the air passing channel 51.

[0050] It can be understood that the air flow is cooled when passing through the cooling plate 20, enters the air cavity 320 from the plurality of first air guide holes 321 through the first air duct 42 between the battery monomers 11, and then enters the fan 50 from the second air guide hole 351. The air flow flows back to the cooling plate 20 in the direction of the air passing channel 51, completing the air cooling internal circulation. The entire circulation process is inside the battery pack 100, which does not affect the sealing of the battery pack 100, and balances the temperature of the battery monomers in the battery pack 100 during the circulation of the cold air.

[0051] Referring to FIG. 9, FIG. 9 is a structural view of the cooling plate of the battery pack shown in FIG. 6. In some embodiments, the cooling plate 20 comprises a bottom plate 21 and a plurality of fins 22, the plurality of fins 22 are arranged on the side of the bottom plate 21 facing the battery module 10, and any two adjacent fins 22 form a second air duct 221, 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 arrangement 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.

[0052] Specifically, the extension direction of the fin 22 is consistent with the direction of the long side of the cooling plate 20. The fin 22 can be arranged in multiple numbers, each fin 22 is perpendicular to the bottom plate 21, and the spacing between the plurality of fins 22 can be the same or different. The height of the fin 22 can be set to be less than the height of the opening of the cross beam on the cooling plate 20. Under the guidance 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.

[0053] The application also provides a power-using device, which comprises the battery pack 100. The battery pack 100 can be used as a power supply or an energy storage unit of the power-using device. The power-using device can be a mobile device (such as a mobile phone, a notebook 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 an electric saw, a lawn mower, etc.), which is not limited herein.

Claims

1. A battery pack, comprising: a battery module; a cooling plate configured to support the battery module; a box having a top plate and a partition plate, the top plate and the partition plate being arranged to form a receiving cavity, the battery module being arranged in the receiving cavity; wherein the battery module comprises a plurality of battery cells and a wind guide arranged between adjacent battery cells, the battery cells and the wind guide being arranged towards the cooling plate, the wind guide being provided with a first air duct penetrating the wind guide in a direction towards the cooling plate.

2. The battery pack of claim 1, wherein, a gap is formed between the bottom end of the wind guide and the cooling plate, and the first air duct communicates the gap and the receiving cavity.

3. The battery pack of claim 1, wherein, Each of the battery cells comprises two first sides and two second sides arranged oppositely, the first sides having a larger area than the second sides, and the wind guide is arranged to the first sides of the battery cells on both sides thereof.

4. The battery pack of any one of claims 1-3, wherein, The box comprises the top plate and the partition plate, the partition plate being arranged on a side of the top plate facing the cooling plate and forming an air cavity with the top plate, the partition plate being provided with a plurality of first air guide holes communicating the air cavity and the first air duct.

5. The battery pack of claim 4, wherein, The partition plate has a projection area on the cooling plate larger than a projection area of the battery module on the cooling plate.

6. The battery pack of any one of claims 4-5, wherein, The box comprises a first side plate, one end of the first side plate being connected to the cooling plate, the other end of the first side plate being connected to the partition plate and / or the top plate, the first side plate being provided with a first air outlet at an end away from the cooling plate, the first air outlet communicating the air cavity.

7. The battery pack of claim 6, wherein, The first air duct extends from an end of the battery cell provided with a pole to a bottom end of the battery cell.

8. The battery pack of claim 6, wherein, The box comprises a second side plate, the second side plate being arranged opposite to the first side plate, the second side plate being provided with a second air outlet at an end close to the cooling plate, the second air outlet communicating the receiving cavity.

9. The battery pack of any of claims 4-5, wherein, The box comprises a first side plate, one end of the first side plate being connected to the cooling plate, and the other end of the first side plate being connected to the top plate, the battery pack further comprising a connecting plate arranged in the box and surrounding the top plate and the partition plate to form the air cavity, the connecting plate being arranged apart from the first side plate, the connecting plate being provided with a second air guide hole communicating the air cavity and the receiving cavity. 10.The battery pack of claim 9, further comprising a fan, the fan being arranged on the top plate at a side of the connecting plate away from the air cavity, the fan comprising an air inlet end and an air outlet end, the air inlet end being arranged towards the second air guide hole, and the air outlet end being arranged towards the cooling plate.

11. The battery pack of claim 10, wherein, The battery module and the first side plate are arranged apart to form an air passing channel, and the air outlet end is arranged towards the air passing channel.

12. The battery pack of any one of claims 1-11, wherein, The cooling plate comprises a bottom plate and a plurality of fins, the plurality of fins being arranged on a side of the bottom plate facing the battery module, and any two adjacent fins forming a second air duct, the second air duct communicating the first air duct. 13.A power consuming device, comprising the battery pack of any one of claims 1-12.

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