Battery pack and electric equipment

Abstract

The invention relates to the technical field of new energy batteries, and discloses a battery pack and electric equipment.The battery pack has a first direction, a second direction and a third direction which intersect pairwise, the battery pack comprises a box body, and the box body is provided with a liquid cooling cavity, a liquid inlet and a liquid outlet; the battery cell comprises a pole and an anti-explosion valve; the separator comprises a first plate, a second plate and a third plate, the third plate is connected between the first plate and the second plate, the first plate and the explosion-proof valve are oppositely arranged along a third direction, the first plate and the adjacent third plate define an exhaust passage extending along the first direction, and the second plate and the pole are oppositely arranged along the third direction; a first heat dissipation flow channel is defined by the second plate, the battery cell and the adjacent third plate, and the first heat dissipation flow channel is communicated with the liquid outlet. Main heating elements such as the pole column are immersed in the cooling liquid, so that the cooling efficiency of the battery cell is improved; and the first heat dissipation flow channel does not cover the explosion-proof valve, and high-pressure gas is exhausted through the exhaust channel, so that the safety of the battery cell during use is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and particularly to a battery pack and an electrical device using the same. Background Art

[0002] With the rapid development of new energy vehicles, the heat dissipation requirements for battery packs by vehicles are getting higher and higher. The existing cooling technologies for battery packs mainly include liquid-cooled plate liquid cooling and immersion liquid cooling. The liquid-cooled plate cooling method mainly exchanges heat between the coolant and the liquid-cooled plate, between the liquid-cooled plate and the thermal conductive adhesive, and between the thermal conductive adhesive and the battery cells. This method has a slow heat dissipation efficiency and a general flow distribution uniformity.

[0003] In the existing immersion battery pack, the battery is immersed in a box body containing insulating coolant, and the battery is in direct contact with the insulating coolant to improve the heat exchange efficiency. However, after the existing battery is placed in the box body and the insulating liquid is injected into the box body, only the lower half of the battery is immersed in the insulating liquid, and the upper half of the battery is exposed outside the insulating liquid. And the upper side of the battery is provided with structures such as pole columns and busbars, which are the main heat generating parts of the battery. If the battery is fully immersed in the insulating liquid, the insulating liquid will block the explosion-proof valve at the top of the battery, affecting the opening and pressure relief of the explosion-proof valve when the battery is out of control thermally. Summary of the Invention

[0004] The object of the present invention is to provide a battery pack that enables the battery to be fully immersed in insulating liquid and ensures the opening and pressure relief of the explosion-proof valve; the present invention also provides an electrical device using the battery pack.

[0005] To achieve the above object, the present invention provides a battery pack. The battery pack has a first direction, a second direction, and a third direction that intersect each other pairwise. The battery pack includes: A box body, which is provided with a liquid-cooling cavity and a liquid inlet and a liquid outlet respectively communicated with the liquid-cooling cavity; A plurality of battery cells, each of the battery cells is arranged in the liquid-cooling cavity, and the battery cell includes a pole column and an explosion-proof valve that are arranged at intervals along the second direction; A partition, the partition seals the liquid cooling chamber, the partition includes a first plate, a second plate and a third plate, the first plate and the second plate are alternately arranged along the second direction, the third plate is connected between the first plate and the second plate, the first plate and the explosion-proof valve are arranged opposite to each other along the third direction, the first plate and the two third plates adjacent to the first plate form an exhaust channel extending along the first direction, the first plate has an exhaust hole arranged opposite to the explosion-proof valve, the exhaust hole penetrates the first plate along the third direction, the second plate and the pole are arranged opposite to each other along the third direction, there is a gap between the second plate and the pole along the third direction, the second plate, the battery cell and the adjacent third plate form a first heat dissipation channel, and the first heat dissipation channel is connected to the drain port.

[0006] In some embodiments, the third plate is tilted, and the distance between the two third plates on both sides of the first plate along the second direction increases from the first plate to the second plate.

[0007] In some embodiments, the battery pack further includes a busbar, which is disposed in the first heat dissipation channel, the busbar extends along the first direction, the busbar and the pole are spaced apart along the second direction, the busbar is provided with a busbar inlet, a busbar channel and a busbar outlet, the busbar inlet connects the first heat dissipation channel with the busbar channel, the busbar outlet connects the busbar channel with the drain port.

[0008] In some embodiments, the confluence inlet penetrates the confluence plate along the second direction, and a plurality of the confluence inlets are spaced apart along the first direction.

[0009] In some embodiments, the box body includes a bottom plate and a frame beam fixedly connected to the bottom plate, the bottom plate and the frame beam enclose the liquid cooling cavity, the liquid inlet is arranged on the bottom plate, and the liquid discharge port is arranged on the frame beam.

[0010] In some embodiments, the frame beam includes a beam body and a drainage pipe fixedly connected to the beam body, the beam body is provided with a drainage cavity, the convergence plate is overlapped with the beam body, the convergence outlet is arranged on the side of the convergence plate facing the beam body, the convergence outlet is connected with the drainage cavity, the drainage pipe is arranged on the side of the beam body away from the liquid cooling cavity, and the drainage pipe is connected with the drainage cavity.

[0011] In some embodiments, the base plate is further provided with a liquid cavity and a liquid outlet, the liquid inlet is connected to the liquid cavity, there are multiple liquid outlets, along the first direction, the liquid outlets are staggered with the battery cells, and the liquid outlets connect the liquid cavity and the liquid cooling cavity.

[0012] In some embodiments, the battery pack further includes current-limiting plates. A plurality of current-limiting plates are provided at intervals along the first direction, and a current-limiting plate is provided between every two adjacent battery cells. Along the first direction, grooves are provided on the sides of the current-limiting plates facing the adjacent battery cells. When the current-limiting plates are in contact with the battery cells, the grooves form second heat dissipation channels, and the second heat dissipation channels communicate the liquid outlet with the first heat dissipation channel.

[0013] In some embodiments, the groove has a flow channel inlet and a flow channel outlet. The flow channel inlet is provided at one end of the current-limiting plate facing the bottom plate, and the flow channel inlet and the liquid outlet are oppositely arranged along the third direction. The flow channel outlet is provided at one end of the current-limiting plate facing the partition member, and the flow channel outlet communicates with the first heat dissipation channel.

[0014] In some embodiments, the current-limiting plate includes a plate body, a first flow dividing member, and a second flow dividing member. The first flow dividing member and the second flow dividing member are provided on both sides of the plate body along the first direction. The first flow dividing member and the second flow dividing member both extend along the second direction, and the first flow dividing member and the second flow dividing member are alternately arranged along the third direction. The interval between the first flow dividing member and the second flow dividing member forms the second heat dissipation channel. The first flow dividing member has a first notch, and the second flow dividing member has a second notch to communicate the second heat dissipation channel. Along the second direction, there is an interval between the first notch and the second notch.

[0015] In some embodiments, the bottom plate includes a plate body and a partition. The liquid cavity is provided in the plate body, and the partition is provided in the liquid cavity. The partition extends along the first direction, and a plurality of partitions are provided at intervals along the second direction. The partitions divide the liquid cavity into a plurality of flow dividing channels along the second direction. The liquid outlet is provided on one side of the plate body close to the partition member, and the liquid outlet communicates with the flow dividing channels.

[0016] In some embodiments, the bottom plate further includes a collecting pipe fixedly connected to the plate body and a liquid inlet pipe communicated with the collecting pipe. The collecting pipe extends along the second direction. A flow dividing port communicated with each of the flow dividing channels is provided on one side of the collecting pipe facing the plate body. The pipe orifice of the liquid inlet pipe forms the liquid inlet.

[0017] The present invention also provides an electrical device, including the battery pack according to any one of the above technical solutions.

[0018] Compared with the prior art, the battery pack and the electrical equipment according to the embodiments of the present invention have the following beneficial effects: An inlet, a liquid chamber, and an outlet are provided on the bottom plate of the box body. The coolant enters the liquid cooling chamber through the inlet. The battery cells are immersed in the coolant in the liquid cooling chamber. After the partition covers the liquid cooling chamber, a first heat dissipation flow channel is formed between the second plate, the third plate, and the battery cells. The coolant in the liquid cooling chamber can enter the first heat dissipation flow channel and be discharged through the drain port. The main heat generating components such as the pole posts of the battery cells are immersed in the coolant, and the coolant directly cools the main heat generating structures such as the pole posts and the bus bars, improving the cooling efficiency of the battery cells. The first plate of the partition is disposed opposite to the explosion-proof valve of the battery cell in the first direction, and the first heat dissipation flow channel does not cover the explosion-proof valve of the battery cell. When the battery cell is thermally out of control, the explosion-proof valve opens, and the high-pressure gas enters the exhaust channel formed by the first plate and the third plate through the explosion-proof valve and the exhaust hole and is discharged, ensuring the safety of the battery cell during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded structural schematic diagram of the battery pack of the present invention; Figure 2 is Figure 1 the top view of the assembled battery pack; Figure 3 is Figure 2 the cross-sectional view of the battery pack along line D-D; Figure 4 is Figure 3 the enlarged structural schematic diagram of the H position of the battery pack; Figure 5 is Figure 1 the assembled structural schematic diagram of the battery pack with the partition omitted; Figure 6 is Figure 1 the structural schematic diagram of the current limiting plate of the battery pack; Figure 7 is Figure 1 the structural schematic diagram of the bus bar of the battery pack; Figure 8 is Figure 7 the cross-sectional view of the bus bar along the plane where the first direction and the second direction are located; Figure 9 is Figure 8 the enlarged schematic diagram of the bus bar at the R position; Figure 10 is Figure 1 the structural schematic diagram of the box body of the battery pack; Figure 11 is Figure 10 the cross-sectional view of the box body along line A-A; Figure 12 is Figure 11 the enlarged schematic diagram of the box body at the M position; Figure 13 isFigure 11 Enlarged schematic view of the box body at N; Figure 14 is Figure 10 Cross-sectional view of the box body along line B-B; Figure 15 is Figure 14 Enlarged schematic view of the box body at P; Figure 16 is Figure 10 Cross-sectional view of the box body along line C-C; Figure 17 is Figure 16 Enlarged schematic view of the box body at Q; Figure 18 Schematic diagram of the distribution of each flow channel of the battery pack of the present invention.

[0020] In the figure, 1. Box body, 11. Bottom plate, 111. Liquid inlet, 112. Liquid cavity, 113. Liquid outlet, 114. Plate body, 115. Partition, 116. Shunt flow channel, 117. Confluence pipe, 118. Shunt port, 119. Liquid inlet pipe, 12. Frame beam, 121. Drain port, 122. Beam body, 123. Drain cavity, 124. Drain pipe, 13. Liquid cooling cavity, 2. Partition member, 21. First plate, 211. Exhaust hole, 22. Second plate, 23. Third plate, 3. Battery cell, 31. Terminal, 32. Explosion-proof valve, 4. Current-limiting plate, 41. Groove, 411. Flow channel inlet, 412. Flow channel outlet, 42. Second heat dissipation flow channel, 43. Plate body, 44. First shunt member, 441. First notch, 45. Second shunt member, 451. Second notch, 5. Confluence plate, 51. Confluence inlet, 52. Confluence flow channel, 53. Confluence outlet, 54. First heat dissipation flow channel, 6. Exhaust channel, X. First direction, Y. Second direction, Z. Third direction. Detailed implementation manners

[0021] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0022] A preferred embodiment of a battery pack of the present invention, as Figures 1 to 18 shown, the battery pack includes a box body 1, a battery cell 3 and a partition member 2. The box body 1 is the structural basis of the battery pack, and the battery cell 3 and the partition member 2 are both arranged on the box body 1.

[0023] The battery pack has a first direction X, a second direction Y and a third direction Z that intersect pairwise. In this embodiment, the first direction X is the length direction of the battery pack, the second direction Y is the width direction of the battery pack, the third direction Z is the height direction of the battery pack, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other pairwise.

[0024] The box body 1 is provided with a liquid cooling cavity 13. The liquid cooling cavity 13 is an open structure with an opening at the upper part, and the liquid cooling cavity 13 is used for assembling the battery cells 3. The box body 1 is also provided with a liquid inlet 111 and a liquid outlet 121. Both the liquid inlet 111 and the liquid outlet 121 are communicated with the liquid cooling cavity 13. The liquid inlet 111 is used for sending cooling liquid into the liquid cooling cavity 13, and the liquid outlet 121 is used for discharging the cooling liquid that has exchanged heat with the battery cells 3. After the cooling liquid exchanges heat with the outside, it can enter the liquid cooling cavity 13 again through the liquid inlet 111 to form a circulating flow.

[0025] There are multiple battery cells 3, and each battery cell 3 is arranged in an array in the liquid cooling cavity 13. The battery cell 3 includes a pole column 31 and an explosion-proof valve 32. The pole column 31 and the explosion-proof valve 32 are arranged at intervals along the second direction Y. The explosion-proof valve 32 is used for discharging the high-temperature and high-pressure substances in the battery cell 3 in time when the battery cell 3 is out of control. In this embodiment, both the pole column 31 and the explosion-proof valve 32 are arranged at the top of the battery cell 3.

[0026] As Figure 2 、 Figure 3 shown in Figure 4 and

[0027] As Figure 4 shown, the partition 2 is arranged on the top of the box body 1. The partition 2 is fixedly connected to the box body 1 and seals the liquid cooling cavity 13. The partition 2 includes a first plate 21, a second plate 22 and a third plate 23. The first plate 21 and the second plate 22 respectively cover at least part of the battery cells 3 along the first direction X, that is, the first plate 21 and the second plate 22 cover the part of the battery cells 3 arranged side by side along the first direction X at the same time. The first plate 21 and the second plate 22 are arranged alternately along the second direction Y, and the third plate 23 is connected between the first plate 21 and the second plate 22. The third plate 23 connects the first plate 21 and the second plate 22 into a whole.

[0028] The second plate 22 and the pole 31 are arranged opposite to each other along the third direction Z, and there is a gap between the second plate 22 and the pole 31 along the third direction Z. The second plate 22, the battery cell 3 and the adjacent third plate 23 enclose part of the liquid cooling cavity 13 to form a first heat dissipation channel 54, and the pole 31 of the battery cell 3 is located in the first heat dissipation channel 54. After the coolant enters the liquid cooling cavity 13 through the liquid inlet 111, it will flow into the first heat dissipation channel 54. At this time, the pole 31 of the battery cell 3 is directly immersed in the coolant in the first heat dissipation channel 54. The pole 31 is the main heating position of the battery cell 3 and can directly exchange heat with the coolant, thereby improving the heat dissipation efficiency and the cooling effect on the battery cell 3. The first heat dissipation channel 54 is connected to the drain port 121, and the coolant can be discharged through the drain port 121 after heat exchange with the pole 31.

[0029] Along the third direction Z, the first heat dissipation channel 54 and the exhaust channel 6 are located on both sides of the partition 2, and because there is a gap between the second plate 22 and the pole 31, and the first plate 21 and the explosion-proof valve 32 are arranged in close proximity, the first heat dissipation channel 54 will not cover the explosion-proof valve 32, thereby preventing the coolant from invading the explosion-proof valve 32 area and affecting the opening of the explosion-proof valve 32, thereby ensuring the safety of the battery cell 3 while using the coolant to dissipate heat from the pole 31.

[0030] The battery pack is provided with a liquid inlet 111, a liquid cavity 112 and a liquid outlet 113 on the bottom plate 11 of the box body 1. The coolant enters the liquid cooling cavity 13 through the liquid inlet 111, and the battery cell 3 is immersed in the coolant in the liquid cooling cavity 13. After the partition 2 covers the liquid cooling cavity 13, the second plate 22, the third plate 23 and the battery cell 3 form a first heat dissipation channel 54. The coolant in the liquid cooling cavity 13 can enter the first heat dissipation channel 54 and be discharged through the drain port 121. The main heating components such as the pole 31 of the battery cell 3 are immersed in the coolant. The cooling liquid directly cools the main heat-generating structures such as the pole 31 and the busbar, thereby improving the cooling efficiency of the battery cell 3; the first plate 21 of the separator 2 and the explosion-proof valve 32 of the battery cell 3 are arranged relatively to and fit along the first direction X, and the first heat dissipation channel 54 is staggered with the explosion-proof valve 32 of the battery cell 3 and will not cover the explosion-proof valve 32 of the battery cell 3. When the battery cell 3 thermally runs away, the explosion-proof valve 32 opens, and the high-pressure gas enters the exhaust channel 6 surrounded by the first plate 21 and the third plate 23 after passing through the explosion-proof valve 32 and the exhaust hole 211 to be discharged, thereby ensuring the safety of the battery cell 3 when in use.

[0031] In some embodiments, the third plate 23 is tilted, and the distance between the two third plates 23 on both sides of the first plate 21 along the second direction Y increases from close to the first plate 21 to close to the second plate 22 .

[0032] like Figure 4As shown, after the third plate 23 is inclined, in the direction from near the first plate 21 to near the second plate 22, that is, along the third direction Z and from bottom to top, the distance between the two third plates 23 on both sides of the first plate 21 increases. At this time, along the second direction Y, the cross-section of the exhaust passage 6 is a trapezoid with a smaller bottom size and a larger top size, and the cross-section of the first heat dissipation channel 54 is a trapezoid with a larger bottom size and a smaller top size. After the high-temperature and high-pressure substance enters the exhaust passage 6 from the explosion-proof valve 32, the space increases, which is convenient for the rapid discharge of the high-temperature and high-pressure substance. And the space near the pole 31 in the first heat dissipation channel 54 is large, increasing the contact heat exchange area between the coolant and the pole 31 and improving the heat dissipation efficiency.

[0033] In some embodiments, the battery pack further includes a busbar 5. The busbar 5 is disposed in the first heat dissipation channel 54. The busbar 5 extends along the first direction X. The busbar 5 and the pole 31 are spaced apart along the second direction Y. The busbar 5 is provided with a busbar inlet 51, a busbar flow channel 52, and a busbar outlet 53. The busbar inlet 51 communicates the first heat dissipation channel 54 with the busbar flow channel 52, and the busbar outlet 53 communicates the busbar flow channel 52 with the liquid discharge port 121.

[0034] As Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 As Figure 9 shown, by disposing the busbar 5 extending along the first direction X in the first heat dissipation channel 54 and spacing the busbar 5 and the pole 31 along the second direction Y, it can ensure the contact heat exchange between the coolant and the pole 31. After the coolant exchanges heat with the pole 31, it can enter the busbar flow channel 52 through the busbar inlet 51, and then be discharged from the busbar outlet 53 into the liquid discharge port 121. The busbar 5 can gather the liquid in the first heat dissipation channel 54 and then discharge it, simplifying the coolant flow mode between the first heat dissipation channel 54 and the liquid discharge port 121 and facilitating the orderly flow of the coolant. In this embodiment, the busbar inlet 51 is a long hole extending along the first direction X, which can increase the size of the busbar inlet 51 and accelerate the rate of the coolant entering the busbar 5.

[0035] In some embodiments, the busbar inlet 51 penetrates the busbar 5 along the second direction Y, and a plurality of busbar inlets 51 are spaced along the first direction X.

[0036] The busbar inlet 51 penetrates the busbar 5 along the second direction Y. At this time, the busbar inlets 51 on both sides of the busbar 5 are both communicated with the busbar flow channel 52, and the coolant can enter the busbar flow channel 52 from both sides respectively, accelerating the flow of the coolant. The busbar inlets 51 are spaced along the first direction X, increasing the rate of the coolant entering the busbar 5 and enhancing the cooling effect on the battery cell 3.

[0037] In some embodiments, the box body 1 includes a bottom plate 11 and a frame beam 12 fixedly connected to the bottom plate 11 , the bottom plate 11 and the frame beam 12 form a liquid cooling chamber 13 , the liquid inlet 111 is provided on the bottom plate 11 , and the liquid outlet 121 is provided on the frame beam 12 .

[0038] like Figure 10 As shown, the box body 1 is formed by a bottom plate 11 and a frame beam 12. In the present embodiment, a liquid inlet 111 is arranged on the bottom plate 11, and a liquid discharge port 121 is arranged on the top of the frame beam 12. The coolant enters the liquid cooling chamber 13 through the liquid inlet 111 on the bottom plate 11. The height of the coolant gradually increases and finally enters the first heat dissipation channel 54, and is then discharged through the liquid discharge port 121, thereby ensuring that the battery cell 3 is completely immersed in the coolant, thereby improving the cooling effect on the battery cell 3.

[0039] In some embodiments, the frame beam 12 includes a beam body 122 and a drainage pipe 124 fixedly connected to the beam body 122, the beam body 122 is provided with a drainage cavity 123, the convergence plate 5 overlaps the beam body 122, the convergence outlet 53 is provided on the side of the convergence plate 5 facing the beam body 122, the convergence outlet 53 is connected to the drainage cavity 123, the drainage pipe 124 is provided on the side of the beam body 122 away from the liquid cooling cavity 13, and the drainage pipe 124 is connected to the drainage cavity 123.

[0040] like Figure 10 , Figure 16 and Figure 17 As shown, a drain pipe 124 and a drain cavity 123 are provided on the beam body 122 of the frame beam 12, and the pipe mouth of the drain pipe 124 forms a drain port 121. After the conduit plate 5 is overlapped with the beam body 122, the coolant can be discharged to the drain cavity 123 through the confluence outlet 53 on the side of the beam body 122. The drain cavity 123 has the function of collecting the coolant, so that the rate at which the coolant is discharged through the drain port 121 is stable.

[0041] In some embodiments, the bottom plate 11 is further provided with a liquid cavity 112 and a liquid outlet 113. The liquid inlet 111 is connected to the liquid cavity 112. There are multiple liquid outlets 113. Along the first direction X, the liquid outlets 113 are staggered with the battery cells 3. The liquid outlets 113 connect the liquid cavity 112 and the liquid cooling cavity 13.

[0042] like Figure 11 , Figure 14 and Figure 15 As shown, the bottom plate 11 is provided with a liquid cavity 112, and the liquid cavity 112 is connected with the liquid cooling cavity 13 by the liquid outlet 113. After the battery cell 3 is placed in the liquid cooling cavity 13, the bottom of the battery cell 3 is in direct contact with the bottom plate 11, and the coolant in the liquid cavity 112 can cool the bottom of the battery cell 3, thereby achieving the cooling effect of the liquid cooling plate. The liquid cavity 112 and the first heat dissipation channel 54 respectively dissipate heat from the top and bottom of the battery cell 3, thereby increasing the heat dissipation area of ​​the battery cell 3 and improving the cooling effect.

[0043] After the battery cell 3 is placed in the liquid cooling cavity 13, a structural adhesive will be provided between the bottom of the battery cell 3 and the bottom plate 11. The liquid outlet 113 is arranged offset from the battery cell 3 in the first direction X, which can prevent the structural adhesive from blocking the liquid outlet 113 and ensure that the coolant in the liquid cavity 112 can flow out through the liquid outlet 113 and enter the liquid cooling cavity 13. In this embodiment, the liquid outlet 113 has a long hole structure and extends along the first direction X.

[0044] In some embodiments, the battery pack further includes a current limiting plate 4. A plurality of current limiting plates 4 are arranged at intervals along the first direction X, and a current limiting plate 4 is provided between adjacent battery cells 3. Along the first direction X, grooves 41 are provided on the side surfaces of the current limiting plate 4 facing the adjacent battery cells 3. When the current limiting plate 4 contacts the battery cell 3, the grooves 41 form a second heat dissipation flow path 42, and the second heat dissipation flow path 42 communicates the liquid outlet 113 with the first heat dissipation flow path 54.

[0045] As Figure 1 、 Figure 4 shown in Figure 6 When a current limiting plate 4 is provided between adjacent battery cells 3, after the current limiting plate 4 contacts the battery cell 3, the grooves 41 formed on the side surface of the current limiting plate 4 facing the battery cell 3 form a second heat dissipation flow path 42. Since the second heat dissipation flow path 42 communicates the liquid outlet 113 with the first heat dissipation flow path 54, the coolant enters the liquid cooling cavity 13 through the liquid outlet 113 and then enters the second heat dissipation flow path 42, and enters the first heat dissipation flow path 54 through the second heat dissipation flow path 42, forming an overall flow path of the coolant from the liquid inlet 111 to the liquid outlet 121.

[0046] As Figure 18 shown in

[0047] When the coolant flows in the second heat dissipation flow path 42, the coolant can directly contact the side surface of the battery cell 3 to cool down the side surface of the battery cell 3. The liquid cavity 112, the first heat dissipation flow path 54, and the second heat dissipation flow path 42 form an overall coolant path, which can dissipate heat from the bottom, top, and side surfaces of the battery cell 3 respectively, increasing the heat dissipation area of the battery cell 3, thereby ensuring uniform heat dissipation at each position of the battery cell 3 and reducing the temperature difference of the battery cell 3.

[0048] In some embodiments, the groove 41 has a flow channel inlet 411 and a flow channel outlet 412. The flow channel inlet 411 is provided at one end of the current-limiting plate 4 facing the bottom plate 11. The flow channel inlet 411 and the liquid outlet 113 are oppositely arranged along the third direction Z. The flow channel outlet 412 is provided at one end of the current-limiting plate 4 facing the partition member 2. The flow channel outlet 412 communicates with the first heat dissipation flow channel 54.

[0049] As Figure 4 shown in Figure 6 As shown, the flow channel inlet 411 and the flow channel outlet 412 are provided on the groove 41, and the flow channel inlet 411 and the liquid outlet 113 are oppositely arranged. The flow channel outlet 412 communicates with the first heat dissipation flow channel 54. After flowing out from the liquid outlet 113, the coolant can directly enter the second heat dissipation flow channel 42 from the flow channel inlet 411 and enter the first heat dissipation flow channel 54 from the flow channel outlet 412, defining the flow path of the coolant, ensuring the fluidity of the coolant, and avoiding the scattered flow of the coolant.

[0050] In some embodiments, the current-limiting plate 4 includes a plate body 43, a first flow dividing member 44, and a second flow dividing member 45. The first flow dividing member 44 and the second flow dividing member 45 are provided on both sides of the plate body 43 along the first direction X. The first flow dividing member 44 and the second flow dividing member 45 both extend along the second direction Y. The first flow dividing member 44 and the second flow dividing member 45 are alternately arranged along the third direction Z. The interval between the first flow dividing member 44 and the second flow dividing member 45 forms the second heat dissipation flow channel 42. The first flow dividing member 44 has a first notch 441, and the second flow dividing member 45 has a second notch 451 to communicate with the second heat dissipation flow channel 42. Along the second direction Y, the first notch 441 and the second notch 451 have an interval.

[0051] As Figure 4 shown in

[0052] Since the first notch 441 and the second notch 451 have an interval along the second direction Y, the coolant flows in a serpentine shape when flowing in the second heat dissipation flow channel 42, increasing the total length of the second heat dissipation flow channel 42 and also increasing the contact area between the coolant and the battery cell 3, improving the heat dissipation effect.

[0053] In some embodiments, the bottom plate 11 includes a plate body 114 and a partition 115. The liquid chamber 112 is provided in the plate body 114, and the partition 115 is provided in the liquid chamber 112. The partition 115 extends along the first direction X, and a plurality of partitions 115 are arranged at intervals along the second direction Y. The partition 115 divides the liquid chamber 112 into a plurality of shunt channels 116 along the second direction Y. The liquid outlet 113 is provided on one side of the plate body 114 close to the separator 2, and the liquid outlet 113 communicates with the shunt channels 116.

[0054] As Figure 11 , Figure 12 and Figure 13 shown, the liquid chamber 112 of the bottom plate 11 is arranged in the plate body 114, which simplifies the formation method of the liquid chamber 112 and also increases the sealing performance of the liquid chamber 112, avoiding leakage of the coolant in the plate body 114. A plurality of partitions 115 extending along the first direction X are arranged in the liquid chamber 112, and the partitions 115 are arranged at intervals along the second direction Y. After the coolant enters the liquid chamber 112, it flows in each shunt channel 116 under the action of the partition 115 and flows out from the liquid outlet 113. The partition 115 can ensure that each shunt channel 116 has a coolant flow channel, ensuring uniform distribution of the coolant in the liquid chamber 112. In this embodiment, through holes can be provided on each partition 115 to connect the shunt channels 116 to ensure uniform shunting of the coolant.

[0055] In some embodiments, the bottom plate 11 further includes a manifold 117 fixedly connected to the plate body 114 and a liquid inlet pipe 119 communicating with the manifold 117. The manifold 117 extends along the second direction Y, and a shunt port 118 communicating with each shunt channel 116 is provided on the side of the manifold 117 facing the plate body 114. The pipe orifice of the liquid inlet pipe 119 forms a liquid inlet 111.

[0056] As Figure 13 shown, the manifold 117 is arranged on the bottom plate 11, and the shunt port 118 on the manifold 117 communicates with each shunt channel 116. The manifold 117 has the function of collecting the coolant, ensuring the pressure balance of the coolant entering the shunt channels 116 and enabling the coolant to enter each shunt channel 116 evenly. The pipe orifice of the liquid inlet pipe 119 forms a liquid inlet 111, and the liquid inlet pipe 119 is convenient for communicating with an external device of the electrical device to send the coolant into the manifold 117.

[0057] The present invention also provides an electrical device, including a battery pack. The specific structure of the battery pack is the same as that of the battery pack in any of the above embodiments, and will not be repeated here.

[0058] In summary, the embodiments of the present invention provide a battery pack and an electrical device. An inlet, a liquid cavity, and an outlet are provided on the bottom plate of the box body. The coolant enters the liquid cooling cavity through the inlet. The battery cells are immersed in the coolant in the liquid cooling cavity. After the partition covers the liquid cooling cavity, a first heat dissipation flow channel is formed between the second plate, the third plate, and the battery cells. The coolant in the liquid cooling cavity can enter the first heat dissipation flow channel and be discharged through the liquid discharge port. The main heat generating components such as the pole columns of the battery cells are immersed in the coolant, and the coolant directly cools the main heat generating structures such as the pole columns and the bus bars, improving the cooling efficiency of the battery cells. The first plate of the partition is disposed opposite to and in contact with the explosion-proof valve of the battery cell along the first direction, and the first heat dissipation flow channel is offset from the explosion-proof valve of the battery cell and does not cover the explosion-proof valve of the battery cell. When the battery cell is thermally out of control, the explosion-proof valve opens, and the high-pressure gas enters the exhaust channel formed by the first plate and the third plate through the explosion-proof valve and the exhaust hole and is discharged, ensuring the safety of the battery cell during use.

[0059] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction, a second direction and a third direction intersecting in pairs, and the battery pack includes: A box body, wherein the box body is provided with a liquid cooling cavity and a liquid inlet and a liquid outlet respectively connected to the liquid cooling cavity; A plurality of battery cells, each of which is disposed in the liquid cooling chamber, and each of which comprises poles and explosion-proof valves spaced apart along the second direction; A partition, the partition seals the liquid cooling chamber, the partition includes a first plate, a second plate and a third plate, the first plate and the second plate are alternately arranged along the second direction, the third plate is connected between the first plate and the second plate, the first plate and the explosion-proof valve are arranged opposite to each other along the third direction, the first plate and the two third plates adjacent to the first plate form an exhaust channel extending along the first direction, the first plate has an exhaust hole arranged opposite to the explosion-proof valve, the exhaust hole penetrates the first plate along the third direction, the second plate and the pole are arranged opposite to each other along the third direction, there is a gap between the second plate and the pole along the third direction, the second plate, the battery cell and the adjacent third plate form a first heat dissipation channel, and the first heat dissipation channel is connected to the drain port.

2. The battery pack according to claim 1, characterized in that: The third plate is arranged obliquely, and the distance between the two third plates on both sides of the first plate along the second direction increases from the first plate to the second plate.

3. The battery pack according to claim 1 or 2, characterized in that: The battery pack also includes a busbar, which is arranged in the first heat dissipation channel, extends along the first direction, and is spaced apart from the pole along the second direction. The busbar is provided with a busbar inlet, a busbar channel and a busbar outlet, the busbar inlet connects the first heat dissipation channel with the busbar channel, and the busbar outlet connects the busbar channel with the drain port.

4. The battery pack according to claim 3, characterized in that: The confluence inlet penetrates the confluence plate along the second direction, and a plurality of the confluence inlets are arranged at intervals along the first direction.

5. The battery pack according to claim 3, characterized in that: The box body also includes a bottom plate and a frame beam fixedly connected to the bottom plate, the bottom plate and the frame beam enclose the liquid cooling cavity, the liquid inlet is arranged on the bottom plate, and the liquid outlet is arranged on the frame beam.

6. The battery pack according to claim 5, characterized in that: The frame beam includes a beam body and a drainage pipe fixedly connected to the beam body, the beam body is provided with a drainage cavity, the convergence plate is overlapped with the beam body, the convergence outlet is arranged on the side of the convergence plate facing the beam body, the convergence outlet is communicated with the drainage cavity, the drainage pipe is arranged on the side of the beam body away from the liquid cooling cavity, and the drainage pipe is communicated with the drainage cavity.

7. The battery pack according to claim 6, characterized in that: The bottom plate is also provided with a liquid cavity and a liquid outlet. The liquid inlet is connected to the liquid cavity. There are multiple liquid outlets. Along the first direction, the liquid outlets are staggered with the battery cells. The liquid outlets connect the liquid cavity and the liquid cooling cavity.

8. The battery pack according to claim 7, characterized in that: The battery pack also includes a current limiting plate, a plurality of which are arranged at intervals along the first direction, and a current limiting plate is arranged between two adjacent battery cells. Along the first direction, grooves are arranged on the sides of the current limiting plate facing the adjacent battery cells, and the current limiting plates are in contact with the battery cells so that the grooves form a second heat dissipation channel, and the second heat dissipation channel connects the liquid outlet and the first heat dissipation channel.

9. The battery pack according to claim 8, characterized in that: The groove has a flow channel inlet and a flow channel outlet. The flow channel inlet is arranged at one end of the flow limiting plate facing the bottom plate. The flow channel inlet and the liquid outlet are arranged opposite to each other along the third direction. The flow channel outlet is arranged at one end of the flow limiting plate facing the partition. The flow channel outlet is connected to the first heat dissipation channel.

10. The battery pack according to claim 9, characterized in that: The limiting plate includes a plate body, a first diverter and a second diverter. The first diverter and the second diverter are provided on both sides of the plate body along the first direction. The first diverter and the second diverter both extend along the second direction. The first diverter and the second diverter are alternately arranged along the third direction. The interval between the first diverter and the second diverter forms the second heat dissipation channel. The first diverter has a first notch and the second diverter has a second notch to connect the second heat dissipation channel. Along the second direction, the first notch and the second notch are spaced apart.

11. The battery pack according to claim 7, characterized in that: The bottom plate includes a plate body and a partition, the liquid cavity is arranged in the plate body, the partition is arranged in the liquid cavity, the partition extends along the first direction, and a plurality of partitions are arranged at intervals along the second direction, the partition divides the liquid cavity into a plurality of branch flow channels along the second direction, the liquid outlet is arranged on a side of the plate body close to the partition, and the liquid outlet is communicated with the branch flow channel.

12. The battery pack according to claim 11, characterized in that: The base plate also includes a manifold fixedly connected to the plate body and a liquid inlet pipe connected to the manifold, the manifold extends along the second direction, and a diversion port connected to each of the diversion channels is provided on one side of the manifold facing the plate body, and the orifice of the liquid inlet pipe forms the liquid inlet.

13. An electrical equipment, characterized in that: A battery pack comprising any one of claims 1 to 12.

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