Battery pack and electrical equipment

Abstract

The present invention relates to the field of new energy battery technology, and discloses a battery pack and electrical equipment. The battery pack has a first direction, a second direction, and a third direction that intersect in pairs. The battery pack includes: a housing, the housing having a liquid cooling chamber, a liquid inlet, and a liquid drain; a battery cell, the battery cell including a pole and an explosion-proof valve; a separator, the separator including a first plate, a second plate, and a third plate, the third plate being connected between the first plate and the second plate, the first plate and the explosion-proof valve being arranged opposite each other along the third direction, the first plate and the adjacent third plate forming an exhaust channel extending along the first direction, the second plate and the pole being arranged opposite each other along the third direction, the second plate, the battery cell, and the adjacent third plate forming a first heat dissipation channel, and the first heat dissipation channel being connected to the liquid drain. The main heating components, such as the pole, are immersed in coolant, thereby improving the cooling efficiency of the battery cell; the first heat dissipation channel does not cover the explosion-proof valve, and high-pressure gas is discharged through the exhaust channel, ensuring the safety of the battery cell during use.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery pack and electrical equipment. Background Art

[0002] With the rapid development of new energy vehicles, the heat dissipation requirements for battery packs are becoming increasingly stringent. Existing battery pack cooling technologies primarily include liquid plate cooling and immersion cooling. Liquid plate cooling primarily involves heat exchange between the coolant and the cold plate, which in turn exchanges heat with thermally conductive adhesive, and finally with the battery cells. This method suffers from slow heat dissipation efficiency and poor flow distribution uniformity.

[0003] Existing submerged battery packs immerse the batteries in a tank containing insulating coolant, creating direct contact between the batteries and the coolant to improve heat exchange efficiency. However, after the batteries are placed in the tank and the insulating liquid is injected, only the lower half of the battery is submerged, leaving the upper half exposed. The upper side of the battery, which houses the terminals, busbars, and other structures and is the primary heat source, can block the explosion-proof valve on top of the battery if the battery experiences thermal runaway. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery pack that can fully immerse the batteries in insulating liquid and ensure that the explosion-proof valve is open to release pressure; 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, wherein the battery pack has a first direction, a second direction, and a third direction intersecting in pairs, and the battery pack comprises:

[0006] A box body, wherein the box body is provided with a liquid cooling cavity and a liquid inlet and a liquid outlet respectively communicated with the liquid cooling cavity;

[0007] A plurality of battery cells, each of the battery cells being disposed in the liquid cooling chamber, and each of the battery cells comprising poles and explosion-proof valves spaced apart along the second direction;

[0008] 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 passes through 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.

[0009] In some embodiments, 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.

[0010] In some embodiments, the battery pack further includes a busbar, which is disposed 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 and the busbar channel, and the busbar outlet connects the busbar channel and the drain port.

[0011] 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.

[0012] 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 form the liquid cooling cavity, the liquid inlet is provided on the bottom plate, and the liquid outlet is provided on the frame beam.

[0013] 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 provided on the side of the convergence plate facing the beam body, the convergence outlet is connected to the drainage cavity, the drainage pipe is provided on the side of the beam body away from the liquid cooling cavity, and the drainage pipe is connected to the drainage cavity.

[0014] 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.

[0015] In some embodiments, the battery pack further includes a current limiting plate, wherein a plurality of the current limiting plates are spaced apart along the first direction, and a current limiting plate is provided between two adjacent battery cells. Along the first direction, the current limiting plates are provided with grooves on the sides 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.

[0016] In some embodiments, 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 base 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, and the flow channel outlet is connected to the first heat dissipation channel.

[0017] In some embodiments, the flow 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 gap 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.

[0018] In some embodiments, the base plate includes a plate body and a partition, the liquid cavity is provided in the plate body, the partition is provided in the liquid cavity, the partition extends along the first direction, and multiple partitions are provided at intervals along the second direction, the partition divides the liquid cavity into multiple diversion channels along the second direction, the liquid outlet is provided on the side of the plate body close to the partition, and the liquid outlet is connected to the diversion channel.

[0019] In some embodiments, 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 the side of the manifold facing the plate body is provided with a diversion port connected to each of the diversion channels, and the pipe mouth of the liquid inlet pipe forms the liquid inlet.

[0020] The present invention also provides an electrical device comprising the battery pack described in any of the above technical solutions.

[0021] Compared with the prior art, a battery pack and electrical equipment according to an embodiment of the present invention have the following beneficial effects: a liquid inlet, a liquid cavity and a liquid outlet are arranged on the bottom plate of the box body, the coolant enters the liquid cooling cavity through the liquid inlet, and the battery cell is immersed in the coolant in the liquid cooling cavity; after the partition covers the liquid cooling cavity, a first heat dissipation channel is formed between the second plate, the third plate and the battery cell; the coolant in the liquid cooling cavity can enter the first heat dissipation channel and be discharged through the drain port; the main heating elements such as the poles of the battery cell are immersed in the coolant, and the coolant directly cools the main heating structures such as the poles and the busbars, thereby improving the cooling efficiency of the battery cell; the first plate of the partition and the explosion-proof valve of the battery cell are arranged relative to each other in a first direction, the first heat dissipation channel will not cover the explosion-proof valve of the battery cell, and the explosion-proof valve will open when the battery cell has thermal runaway, and the high-pressure gas will enter the exhaust channel surrounded by the first plate and the third plate after passing through the explosion-proof valve and the exhaust hole for discharge, thereby ensuring the safety of the battery cell during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the explosion structure of the battery pack of the present invention;

[0023] Figure 2 yes Figure 1 A top view of the assembled battery pack;

[0024] Figure 3 yes Figure 2 A cross-sectional view of the battery pack along line DD;

[0025] Figure 4 yes Figure 3 An enlarged schematic diagram of the structure at H of the battery pack;

[0026] Figure 5 yes Figure 1 A schematic diagram of the assembly structure of the battery pack after omitting the separator;

[0027] Figure 6 yes Figure 1 A schematic structural diagram of a current limiting plate of a battery pack;

[0028] Figure 7 yes Figure 1 A schematic structural diagram of a busbar of a battery pack;

[0029] Figure 8 yes Figure 7 A cross-sectional view of the busbar along the planes of the first direction and the second direction;

[0030] Figure 9 yes Figure 8 An enlarged schematic diagram of the manifold at R;

[0031] Figure 10 yes Figure 1 A schematic structural diagram of a battery pack box;

[0032] Figure 11 yes Figure 10 The cross-sectional view of the box along line AA;

[0033] Figure 12 yes Figure 11 An enlarged schematic diagram of the box at M;

[0034] Figure 13 yes Figure 11 An enlarged schematic diagram of the box at position N;

[0035] Figure 14 yes Figure 10 The cross-sectional view of the box along line BB;

[0036] Figure 15 yes Figure 14 An enlarged schematic diagram of the box at P;

[0037] Figure 16 yes Figure 10 The cross-sectional view of the box along the CC line;

[0038] Figure 17 yes Figure 16 An enlarged schematic diagram of the box at Q;

[0039] Figure 18 Schematic diagram of the flow channel distribution of the battery pack of the present invention.

[0040] In the figure, 1, box body, 11, bottom plate, 111, liquid inlet, 112, liquid cavity, 113, liquid outlet, 114, plate body, 115, partition, 116, diversion channel, 117, manifold, 118, diversion 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, 21, first plate, 211, exhaust hole, 22, second plate, 23, third plate, 3. Battery cell, 31. Pole, 32. Explosion-proof valve, 4. Current limiting plate, 41. Groove, 411. Flow channel inlet, 412. Flow channel outlet, 42. Second heat dissipation channel, 43. Plate, 44. First diverter, 441. First notch, 45. Second diverter, 451. Second notch, 5. Confluence plate, 51. Confluence inlet, 52. Confluence channel, 53. Confluence outlet, 54. First heat dissipation channel, 6. Exhaust channel, X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0041] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0042] A preferred embodiment of a battery pack of the present invention is as follows Figures 1 to 18 As shown, the battery pack includes a box body 1, battery cells 3 and separators 2. The box body 1 is the structural basis of the battery pack, and the battery cells 3 and separators 2 are both arranged on the box body 1.

[0043] The battery pack has a first direction X, a second direction Y, and a third direction Z that intersect with each other. 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, and the third direction Z is the height direction of the battery pack. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0044] The housing 1 is provided with a liquid cooling chamber 13, which is an open structure with an upper opening. The liquid cooling chamber 13 is used to assemble the battery cells 3. The housing 1 is also provided with a liquid inlet 111 and a liquid outlet 121, both of which are connected to the liquid cooling chamber 13. The liquid inlet 111 is used to supply coolant into the liquid cooling chamber 13, and the liquid outlet 121 is used to discharge the coolant after heat exchange with the battery cells 3. After exchanging heat with the outside world, the coolant can re-enter the liquid cooling chamber 13 through the liquid inlet 111, forming a circulating flow.

[0045] There are multiple battery cells 3, each arrayed within the liquid cooling chamber 13. The battery cells 3 include poles 31 and explosion-proof valves 32, spaced apart along the second direction Y. The explosion-proof valves 32 are used to promptly discharge high-temperature, high-pressure materials within the battery cells 3 in the event of thermal runaway. In this embodiment, both the poles 31 and the explosion-proof valves 32 are located at the top of the battery cells 3.

[0046] like Figure 2 、 Figure 3 and Figure 4 As shown, the separator 2 is disposed on the top of the housing 1. The separator 2 is fixedly connected to the housing 1 and seals the liquid cooling chamber 13. The separator 2 includes a first plate 21, a second plate 22, and a third plate 23. The first plate 21 and the second plate 22 each cover at least a portion of the battery cells 3 along the first direction X. That is, the first plate 21 and the second plate 22 simultaneously cover a portion of the battery cells 3 arranged in parallel along the first direction X. The first plates 21 and the second plates 22 are arranged alternately along the second direction Y. The third plate 23 is connected between the first plate 21 and the second plate 22, and the third plate 23 connects the first plate 21 and the second plate 22 into a whole.

[0047] like Figure 4As shown, the first plate 21 and the explosion-proof valve 32 are arranged opposite each other along the third direction Z. The first plate 21 is in contact with the explosion-proof valve 32. The first plate 21 and two third plates 23 adjacent to the first plate 21 form an exhaust channel 6 extending along the first direction X. The exhaust channel 6 and the explosion-proof valve 32 are respectively located on either side of the first plate 21 along the third direction Z. The first plate 21 has an exhaust hole 211. The exhaust hole 211 is arranged opposite the explosion-proof valve 32 along the third direction Z. The exhaust hole 211 penetrates the first plate 21 along the third direction Z, thereby connecting the explosion-proof valve 32 with the exhaust channel 6. When the battery cell 3 experiences thermal runaway, the explosion-proof valve 32 opens, and high-temperature, high-pressure materials are ejected through the explosion-proof valve 32 and enter the exhaust channel 6 through the exhaust hole 211, allowing the high-temperature, high-pressure materials to be quickly discharged.

[0048] The second plate 22 and the pole 31 are arranged opposite each other along the third direction Z, with a gap between them. The second plate 22, the battery cell 3, and the adjacent third plate 23 enclose a portion of the liquid cooling chamber 13 to form a first heat dissipation channel 54. The pole 31 of the battery cell 3 is located within the first heat dissipation channel 54. After entering the liquid cooling chamber 13 through the liquid inlet 111, the coolant flows into the first heat dissipation channel 54. At this time, the pole 31 of the battery cell 3 is directly immersed in the coolant within the first heat dissipation channel 54. The pole 31 is the primary heat generating location in the battery cell 3 and can directly exchange heat with the coolant, improving heat dissipation efficiency and enhancing the cooling effect on the battery cell 3. The first heat dissipation channel 54 is connected to the drain port 121, through which the coolant can be discharged after exchanging heat with the pole 31.

[0049] 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 since 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 contact, 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. While using the coolant to dissipate heat from the pole 31, the safety of the battery cell 3 is guaranteed.

[0050] 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, a first heat dissipation channel 54 is formed between the second plate 22, the third plate 23 and the battery cell 3. 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 relative to and in contact with each other 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, and is discharged, thereby ensuring the safety of the battery cell 3 when in use.

[0051] In some embodiments, the third plates 23 are 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 .

[0052] like Figure 4 As shown, after the third plates 23 are tilted, the distance between the two third plates 23 on either side of the first plate 21 increases from closer to the first plate 21 to closer to the second plate 22, that is, along the third direction Z and from bottom to top. At this time, along the second direction Y, the cross-section of the exhaust channel 6 is a trapezoidal shape with a small bottom and a large top. The cross-section of the first heat dissipation channel 54 is a trapezoidal shape with a large bottom and a small top. After high-temperature, high-pressure materials enter the exhaust channel 6 through the explosion-proof valve 32, the space is increased, facilitating their rapid discharge. The large space in the first heat dissipation channel 54 near the pole 31 increases the contact and heat exchange area between the coolant and the pole 31, improving heat dissipation efficiency.

[0053] In some embodiments, the battery pack further includes a busbar 5, which is disposed in the first heat dissipation channel 54, extends along the first direction X, and is spaced apart from the pole 31 along the second direction Y. The busbar 5 is provided with a busbar inlet 51, a busbar channel 52, and a busbar outlet 53. The busbar inlet 51 connects the first heat dissipation channel 54 with the busbar channel 52, and the busbar outlet 53 connects the busbar channel 52 with the drain port 121.

[0054] like Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 and Figure 9As shown, a busbar 5 extending along the first direction X is provided in the first heat dissipation channel 54. The busbar 5 and the pole 31 are spaced apart along the second direction Y, which can ensure that the coolant contacts and exchanges heat with the pole 31. After the coolant exchanges heat with the pole 31, it can enter the busbar channel 52 through the busbar inlet 51 and then enter the drain port 121 through the busbar outlet 53 for discharge. The busbar 5 can collect the liquid in the first heat dissipation channel 54 before discharging it, simplifying the flow of coolant between the first heat dissipation channel 54 and the drain port 121 and facilitating the orderly flow of 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 speed up the rate at which the coolant enters the busbar 5.

[0055] In some embodiments, the confluence inlet 51 penetrates the confluence plate 5 along the second direction Y, and a plurality of confluence inlets 51 are provided at intervals along the first direction X.

[0056] The confluence inlet 51 extends through the busbar 5 along the second direction Y. At this point, the confluence inlets 51 on both sides of the busbar 5 are connected to the confluence channel 52, allowing coolant to enter the confluence channel 52 from both sides, accelerating the flow of coolant. Multiple confluence inlets 51 are provided at intervals along the first direction X to increase the rate at which coolant enters the busbar 5 and improve the cooling effect on the battery cells 3.

[0057] 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 .

[0058] like Figure 10 As shown, the box body 1 is formed by a bottom plate 11 and a frame beam 12. In this embodiment, the liquid inlet 111 is set on the bottom plate 11, and the liquid discharge port 121 is set at 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, which can ensure that the battery cell 3 is completely immersed in the coolant, thereby improving the cooling effect of the battery cell 3.

[0059] 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 busbar 5 overlaps the beam body 122, the confluence outlet 53 is provided on the side of the busbar 5 facing the beam body 122, the confluence 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.

[0060] like Figure 10 、 Figure 16 and Figure 17As 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 convergence plate 5 is overlapped with the beam body 122, the coolant can be discharged to the drain cavity 123 through the convergence outlet 53 toward 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.

[0061] In some embodiments, the base 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.

[0062] like Figure 11 、 Figure 14 and Figure 15 As shown, the bottom plate 11 is provided with a liquid cavity 112, and a liquid outlet 113 connects the liquid cavity 112 with the liquid cooling cavity 13. 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. The coolant in the liquid cavity 112 can cool the bottom of the battery cell 3, 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, increasing the heat dissipation area of ​​the battery cell 3 and improving the cooling effect.

[0063] After the battery cell 3 is placed in the liquid cooling chamber 13, structural adhesive is disposed between the bottom of the battery cell 3 and the base plate 11. The liquid outlet 113 is staggered with the battery cell 3 along the first direction X. This prevents the structural adhesive from clogging the liquid outlet 113, ensuring that the coolant in the liquid chamber 112 can flow out through the liquid outlet 113 and enter the liquid cooling chamber 13. In this embodiment, the liquid outlet 113 is a long hole structure and extends along the first direction X.

[0064] In some embodiments, the battery pack further includes a current limiting plate 4, wherein 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 each adjacent battery cell 3. Along the first direction X, a groove 41 is provided on the side of the current limiting plate 4 facing the adjacent battery cell 3. The current limiting plate 4 contacts the battery cell 3 so that the groove 41 forms a second heat dissipation channel 42, and the second heat dissipation channel 42 connects the liquid outlet 113 and the first heat dissipation channel 54.

[0065] like Figure 1 、 Figure 4 and Figure 6As shown, a current limiting plate 4 is arranged between adjacent battery cells 3. After the current limiting plate 4 contacts the battery cell 3, a groove 41 opened on the side of the current limiting plate 4 facing the battery cell 3 forms a second heat dissipation channel 42. Since the second heat dissipation channel 42 connects the liquid outlet 113 and the first heat dissipation channel 54, the coolant enters the liquid cooling chamber 13 through the liquid outlet 113 and then enters the second heat dissipation channel 42, and enters the first heat dissipation channel 54 through the second heat dissipation channel 42, forming an overall flow path of the coolant from the liquid inlet 111 to the liquid outlet 121.

[0066] like Figure 18 As shown, when the coolant flows in the second heat dissipation channel 42, the coolant can directly contact the side of the battery cell 3, cooling the side of the battery cell 3. The liquid cavity 112, the first heat dissipation channel 54, and the second heat dissipation channel 42 form an integrated coolant path, which can dissipate heat from the bottom, top, and sides of the battery cell 3 respectively, thereby increasing the heat dissipation area of ​​the battery cell 3, ensuring uniform heat dissipation at all positions of the battery cell 3, and reducing temperature differences within the battery cell 3.

[0067] In this embodiment, the battery core 3 is square, and the second heat dissipation channel 42 contacts the large surface of the battery core 3 to increase the contact area; in other embodiments, the battery core 3 can also be cylindrical, and the second heat dissipation channel 42 can be a spiral structure arranged around the battery core 3.

[0068] In some embodiments, the groove 41 has a flow channel inlet 411 and a flow channel outlet 412. The flow channel inlet 411 is arranged at one end of the flow limiting plate 4 facing the base plate 11. The flow channel inlet 411 and the liquid outlet 113 are arranged opposite to each other along the third direction Z. The flow channel outlet 412 is arranged at one end of the flow limiting plate 4 facing the partition 2. The flow channel outlet 412 is connected to the first heat dissipation channel 54.

[0069] like Figure 4 and Figure 6 As shown, a flow channel inlet 411 and a flow channel outlet 412 are provided on the groove 41, and the flow channel inlet 411 is arranged opposite to the liquid outlet 113, and the flow channel outlet 412 is connected to the first heat dissipation channel 54. After the coolant flows out through the liquid outlet 113, it can directly enter the second heat dissipation channel 42 from the flow channel inlet 411 and enter the first heat dissipation channel 54 from the flow channel outlet 412, which limits the flow path of the coolant, ensures the fluidity of the coolant, and avoids the scattered flow of the coolant.

[0070] In some embodiments, the flow limiting plate 4 includes a plate body 43, a first diverter 44 and a second diverter 45. The first diverter 44 and the second diverter 45 are provided on both sides of the plate body 43 along the first direction X. The first diverter 44 and the second diverter 45 both extend along the second direction Y. The first diverter 44 and the second diverter 45 are alternately arranged along the third direction Z. The gap between the first diverter 44 and the second diverter 45 forms a second heat dissipation channel 42. The first diverter 44 has a first notch 441 and the second diverter 45 has a second notch 451 to connect the second heat dissipation channel 42. Along the second direction Y, the first notch 441 and the second notch 451 are spaced apart.

[0071] like Figure 4 As shown, the flow limiting plate 4 is formed by a plate body 43, a first diverter 44 and a second diverter 45. The gap between the first diverter 44 and the second diverter 45 forms a second heat dissipation channel 42. The first notch 441 on the first diverter 44 and the second notch 451 on the second diverter 45 ensure that the second heat dissipation channel 42 is connected as a whole between the channel inlet 411 and the channel outlet 412, so that the coolant flows between the first diverter 44 and the second diverter 45.

[0072] Since the first notch 441 and the second notch 451 are spaced apart along the second direction Y, the coolant flows in a serpentine shape in the second heat dissipation channel 42 , thereby increasing the total length of the second heat dissipation channel 42 and the contact area between the coolant and the battery cell 3 , thereby improving the heat dissipation effect.

[0073] In some embodiments, the base plate 11 includes a plate body 114 and a partition 115. The liquid chamber 112 is provided on the plate body 114, and the partition 115 is provided on the liquid chamber 112. The partition 115 extends along the first direction X. Multiple partitions 115 are arranged at intervals along the second direction Y. The partition 115 divides the liquid chamber 112 into multiple diversion channels 116 along the second direction Y. The liquid outlet 113 is provided on a side of the plate body 114 close to the partition 2, and the liquid outlet 113 is connected to the diversion channel 116.

[0074] like Figure 11 、 Figure 12 and Figure 13As shown, the liquid cavity 112 of the bottom plate 11 is disposed within the plate body 114, which simplifies the formation of the liquid cavity 112 and improves the sealing of the liquid cavity 112, thereby preventing leakage of the coolant within the plate body 114. A plurality of partitions 115 extending along a first direction X are disposed within the liquid cavity 112, with each partition 115 spaced apart along a second direction Y. After the coolant enters the liquid cavity 112, it flows within each diversion channel 116 under the action of the partitions 115 and flows out through the liquid outlet 113. The partitions 115 ensure that each diversion channel 116 has a coolant flow channel, ensuring that the coolant is evenly distributed within the liquid cavity 112. In this embodiment, each partition 115 may be provided with a through hole connecting each diversion channel 116 to ensure uniform coolant diversion.

[0075] In some embodiments, the base plate 11 also includes a manifold 117 fixedly connected to the plate body 114 and a liquid inlet pipe 119 connected to the manifold 117. The manifold 117 extends along the second direction Y. The manifold 117 is provided with a diversion port 118 connected to each diversion channel 116 on the side facing the plate body 114. The mouth of the liquid inlet pipe 119 forms a liquid inlet 111.

[0076] like Figure 13 As shown, a manifold 117 is provided on the bottom plate 11. The branch ports 118 on the manifold 117 are connected to the various branch flow channels 116. The manifold 117 has the function of collecting the coolant, ensuring that the pressure of the coolant entering the branch flow channels 116 is balanced, and also allowing the coolant to enter the various branch flow channels 116 evenly. The opening of the liquid inlet pipe 119 forms the liquid inlet 111. The liquid inlet pipe 119 is conveniently connected to the external equipment of the electrical equipment to deliver the coolant to the manifold 117.

[0077] The present invention further provides an electrical device including a battery pack. The specific structure of the battery pack is the same as the specific structure of the battery pack described in any of the above embodiments, and will not be repeated here.

[0078] In summary, an embodiment of the present invention provides a battery pack and an electrical device, which has a liquid inlet, a liquid cavity and a liquid outlet on the bottom plate of the box body. The coolant enters the liquid cooling cavity through the liquid inlet, and the battery cell is immersed in the coolant in the liquid cooling cavity. After the partition covers the liquid cooling cavity, a first heat dissipation channel is formed between the second plate, the third plate and the battery cell. The coolant in the liquid cooling cavity can enter the first heat dissipation channel and be discharged through the drain port. The main heating elements such as the poles of the battery cell are immersed in the coolant, and the coolant directly cools the main heating structures such as the poles and busbars, thereby improving the cooling efficiency of the battery cell; the first plate of the partition and the explosion-proof valve of the battery cell are arranged relative to and fit together in a first direction, and the first heat dissipation channel and the explosion-proof valve of the battery cell are staggered and will not cover the explosion-proof valve of the battery cell. When the battery cell thermally runs away, the explosion-proof valve opens, and the high-pressure gas enters the exhaust channel surrounded by the first plate and the third plate after passing through the explosion-proof valve and the exhaust hole and is discharged, thereby ensuring the safety of the battery cell when in use.

[0079] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection 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 communicated with the liquid cooling cavity; A plurality of battery cells, each of the battery cells being disposed in the liquid cooling chamber, and each of the battery cells comprising poles and explosion-proof valves spaced apart along the second direction; a partition, the partition sealing the liquid cooling chamber, the partition comprising a first plate, a second plate and a third plate, the first plate and the second plate being alternately arranged along the second direction, the third plate being connected between the first plate and the second plate, the first plate and the explosion-proof valve being arranged opposite to each other along the third direction, the first plate and two third plates adjacent to the first plate forming an exhaust channel extending along the first direction, the first plate having an exhaust hole arranged opposite to the explosion-proof valve, the exhaust hole penetrating the first plate along the third direction, the second plate and the pole being arranged opposite to each other along the third direction, a gap being formed between the second plate and the pole along the third direction, the second plate, the battery cell and the adjacent third plates forming a first heat dissipation channel, the first heat dissipation channel being connected to the drain port; 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 and the busbar channel, and the busbar outlet connects the busbar channel and the drain port.

2. The battery pack according to claim 1, wherein: The third plates are 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 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.

4. The battery pack according to claim 1 or 2, characterized in that: The box body further comprises 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.

5. The battery pack according to claim 4, 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 provided on the side of the convergence plate facing the beam body, the convergence outlet is connected to the drainage cavity, the drainage pipe is provided on the side of the beam body away from the liquid cooling cavity, and the drainage pipe is connected to the drainage cavity.

6. The battery pack according to claim 5, 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.

7. The battery pack according to claim 6, characterized in that: The battery pack also includes a current limiting plate, and multiple current limiting plates are arranged at intervals along the first direction. A current limiting plate is provided between two adjacent battery cells. Along the first direction, the current limiting plates are provided with grooves on the sides facing the adjacent battery cells. 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.

8. The battery pack according to claim 7, 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, and the flow channel outlet is connected to the first heat dissipation channel.

9. The battery pack according to claim 8, characterized in that: The flow 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 gap 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.

10. The battery pack according to claim 6, characterized in that: 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. A plurality of partitions are provided at intervals along the second direction. The partition divides the liquid cavity into a plurality of diversion channels along the second direction. The liquid outlet is provided on a side of the plate body close to the partition, and the liquid outlet is connected to the diversion channel.

11. The battery pack according to claim 10, 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 the side of the manifold facing the plate body, and the orifice of the liquid inlet pipe forms the liquid inlet.

12. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 11.

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