Immersed battery pack and energy storage cabinet

Abstract

The invention relates to the technical field of electrochemical energy storage, and discloses an immersed battery pack, which comprises a box body and a plurality of groups of battery modules positioned in the box body, the box body comprises a supporting piece used for supporting the plurality of groups of battery modules and used for circulation of immersion liquid, each battery module comprises a plurality of battery cells, the battery module is provided with heat insulation pieces attached to the bottoms and the side faces of the lower ends of the battery cells, the supporting piece is provided with a plurality of liquid outlet holes used for allowing immersion liquid to flow into the battery pack, the battery module further comprises a plurality of flow guide pieces located between the adjacent battery cells respectively, and the flow guide pieces are provided with a plurality of via holes used for allowing the immersion liquid to flow through in the height direction; and the immersion liquid dissipates heat for the opposite surfaces of the adjacent battery cells through the flow guide pieces. The supporting piece for the inflow of the immersion liquid does not occupy the internal space of the battery pack, so that the manufacturing cost of the battery pack is reduced, the temperature uniformity of the battery cell can be ensured, and the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochemical energy storage, and in particular to an immersion battery pack and an energy storage cabinet. Background Art

[0002] During use of the battery pack, the multiple battery cells in the battery pack will generate a large amount of heat. In order to dissipate the heat of the battery cells, the battery cells are usually immersed in an immersion liquid in the battery pack. The immersion liquid flows into the battery pack through a flow channel structure provided at the top of the battery pack. However, the flow channel structure provided at the top of the battery pack not only occupies the internal space of the battery pack, but also makes the overall width of the battery pack wider, thereby increasing the cost of manufacturing the battery pack. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, one of the objects of the present invention is to provide an immersion type battery pack, in which the support member for the flow of immersion liquid does not need to occupy the internal space of the battery pack, thereby reducing the cost of manufacturing the battery pack, and can also ensure the temperature uniformity of the battery cell itself and improve the service life of the battery cell.

[0004] The technical solution adopted by the present invention is as follows: an immersion battery pack, comprising a box body, and also comprising multiple groups of battery modules located in the box body, the box body comprising a support member for supporting the multiple groups of battery modules and for the circulation of immersion liquid, the battery module comprising multiple battery cells, the battery module is provided with a heat insulating member that is in contact with the bottom and side surfaces of the lower ends of the multiple battery cells, and the support member is provided with multiple liquid outlet holes for the immersion liquid to flow into the battery pack.

[0005] Principle of the technical solution: The immersion liquid flows into the battery pack through the liquid outlet hole on the support. The heat insulation member is located at the lower end of the battery cell to guide the immersion liquid, guiding the immersion liquid to first contact the upper end of the battery cell to dissipate the heat of the battery cell, and then contact the lower end of the battery cell to dissipate the heat of the battery cell.

[0006] Compared with the prior art, the present invention has the following beneficial effects: The support member of the present invention can be used to support multiple groups of battery modules and to circulate immersion liquid. The support member does not need to occupy the internal space of the battery pack, thereby reducing the cost of manufacturing the battery pack. Since the immersion liquid flows out from the support member, the lower surface of the battery cell will first contact with the immersion liquid, which will make the temperature of the lower surface of the battery cell lower than the temperature of the upper surface of the battery cell, resulting in a large temperature difference between the upper and lower parts of the battery cell. In addition, the design of the thermal insulation member guides the immersion liquid, guiding the immersion liquid to first contact with the upper end of the battery cell to dissipate the heat of the battery cell, and then contact with the lower end of the battery cell to dissipate the heat of the battery cell. This can avoid the lower surface temperature of the battery cell being too low, and avoid a large temperature difference between the upper and lower parts of the battery cell. That is, while allowing the immersion liquid to flow into the battery pack through the support member, it can also ensure the temperature uniformity of the battery cell itself, thereby increasing the service life of the battery cell, which is equivalent to allowing the immersion liquid to flow out from the top of the battery pack.

[0007] As a preferred embodiment of the present invention, the battery module further comprises a plurality of flow guides respectively located between adjacent battery cells, wherein the flow guides are provided with a plurality of through holes in the height direction for the immersion liquid to flow through, and the immersion liquid dissipates heat for opposite surfaces of adjacent battery cells through the flow guides.

[0008] Background introduction: In the existing immersion battery pack, multiple cells in each battery module are bonded together in pairs, and the immersion liquid can only contact the outer surfaces on both sides of the cell. The immersion liquid can quickly dissipate heat for the outer surfaces on both sides of the cell. The heat in the middle of the cell is transferred to the outer surfaces on both sides of the cell by heat conduction, which can easily lead to a large temperature difference between the two sides of the cell and the temperature of the bonding between adjacent cells, which can easily lead to different electrochemical reaction rates in different areas inside the cell, which can easily lead to the instability of the overall performance of the cell, causing the cell capacity to gradually decay and shortening the service life of the cell.

[0009] Beneficial effects: The immersion liquid dissipates heat for the opposite surfaces of adjacent battery cells through the vias on the guide piece. The guide piece and the multiple vias on the guide piece can ensure that the immersion liquid flows between adjacent battery cells, dissipates heat for the close surfaces of adjacent battery cells in the same battery module, prevents large temperature differences between the two sides of the battery cell and the middle of the battery cell, and improves the service life of the battery cell. The guide piece can also resist the expansion force generated during the charging and discharging process of the battery cell, and can avoid direct friction and collision between the battery cells, thereby protecting the integrity of the battery cell and reducing the risk of short circuit.

[0010] As a preferred embodiment of the present invention, the battery module also includes two steel belts for connecting multiple battery cells and multiple flow guides together, the two steel belts are respectively close to the battery cell poles and the bottom of the battery cell, the thermal insulation member is in contact with the outer surface of the steel belt close to the bottom of the battery cell, the lower surface of the flow guide member is located above the thermal insulation member, and the upper surface of the flow guide member is located below the upper surface of the battery cell.

[0011] Beneficial effects: 1) The thermal insulation is fitted with the outer surface of the steel belt near the bottom of the battery cell. Due to the thickness of the steel belt, there is a gap between the thermal insulation and the side of the battery cell. The lower surface of the guide is located above the upper surface of the thermal insulation, so that there is a gap between the guide and the thermal insulation, which can facilitate the flow of immersion liquid. It can not only avoid the immersion liquid from directly contacting the lower part of the battery cell, but also allow the immersion liquid to contact the lower part of the battery cell after passing through the thermal insulation, thereby ensuring effective heat dissipation for the battery cell; 2) Since a bus is provided between the upper surfaces of adjacent battery cells (the bus is respectively connected to the battery poles of adjacent battery cells), the upper surface of the guide is located below the upper surface of the battery cell, that is, a safe distance is reserved between the guide and the bus, thereby preventing short circuit caused by contact between the guide and the bus, thereby improving the electrical safety of the battery pack.

[0012] As a preferred embodiment of the present invention, the thermal insulation component includes a first connecting part and second connecting parts respectively located at both ends of the first connecting part, the first connecting part is bonded to the lower surfaces of multiple battery cells, and the two second connecting parts are respectively bonded to steel strips close to the bottom of the battery cells and located in the width direction of the battery cells.

[0013] Beneficial effect: the first connecting part and the second connecting part can cooperate to cover the bottom of multiple battery cells in the corresponding battery module, and there is a gap between the first connecting part and the guide part, and there is a gap between the second connecting part and the side of the battery cell, so that when the immersion liquid flows into the battery compartment, the immersion liquid will not contact the lower part of the battery cell at the first time. After the immersion liquid overflows the upper end of the first connecting part, it contacts the lower part of the battery cell through the gap between the second connecting part and the side of the battery cell. Moreover, this gap is not large, and the immersion liquid contacts the lower part of the battery cell slowly. At the same time, the immersion liquid contacts the upper part of the battery cell quickly. During the discharge of the battery cell, the temperature of the upper part of the battery cell will be higher than the temperature of the lower part of the battery cell. Conventional immersion liquid flows from the upper part of the battery cell to the lower part of the battery cell. In the present invention, due to the provision of the heat insulating part, it is also possible to achieve physical isolation of multiple battery cells and multiple electrical components and reasonable spatial layout, and realize heat dissipation of the upper part of the battery cell first and then the lower part of the battery cell, thereby ensuring good temperature uniformity of the battery cell itself.

[0014] As a preferred embodiment of the present invention, it also includes a box cover, and the box body also includes a frame and a partition located in the box body. The frame and the support member are connected to form a accommodating cavity, and the partition is respectively connected to the inner wall of the frame and the upper surface of the support member. The box cover, partition, frame, and support member cooperate to divide the accommodating cavity into two closed battery compartments and electrical compartments, respectively. The support member also includes a liquid inlet hole, a first liquid return hole, and a second liquid return hole located outside the frame, and the liquid outlet hole is located outside the frame. The immersion liquid flows into the battery compartment through the liquid inlet hole and multiple liquid outlet holes to immerse the battery cells. After the immersion liquid dissipates the heat for the battery cells, it flows out of the battery pack through the second liquid return hole and the first liquid return hole on the support member. The liquid inlet hole, liquid outlet hole, second liquid return hole, and first liquid return hole on the support member form a path for the flow of immersion liquid for dissipating the heat for the battery cells.

[0015] Beneficial effects: 1) It can ensure that the immersion liquid only immerses the battery cell. The liquid outlet hole and the second liquid return hole are directly set on the support member, and the support member is used to support multiple groups of battery modules. The support member is also the bottom of the box body. There is no need to set up an additional flow channel structure for the immersion liquid to flow into the battery pack, which can save the internal space of the battery pack and save the cost of manufacturing the battery pack; 2) The design of multiple liquid outlet holes distributed at intervals. Since the number of liquid outlet holes is greater than the number of second liquid return holes, the amount of immersion liquid entering the battery pack is greater than the amount of immersion liquid flowing out of the battery pack. The immersion liquid can be stored in the battery pack and immerse the cells in the battery pack. The immersion liquid can flow to the cells at different positions in the battery pack through the liquid outlet holes at the same time, dissipating heat for each cell in the battery pack at the same time, reducing the temperature difference between multiple cells in the battery pack, and improving the service life of the battery pack. 3) Since the immersion liquid has a fast flow rate when flowing in the support and a slow flow rate when located in the battery pack, the provision of multiple liquid outlet holes, compared with only one liquid outlet hole, can allow the immersion liquid flowing out of the liquid outlet holes on the support to flow quickly to the surroundings of the battery cells, so that multiple battery cells can quickly contact the immersion liquid, thereby improving the heat dissipation efficiency; since the flow rate of the immersion liquid flowing out of the liquid outlet holes is greater than the flow rate of the immersion liquid located in the battery pack, the immersion liquid flowing out of the multiple liquid outlet holes can drive the circulation of the immersion liquid in the battery pack, so that the immersion liquid in various places in the battery pack is evenly mixed, ensuring that the temperature of the immersion liquid in various places in the battery pack is consistent, ensuring the uniformity of temperature between multiple battery cells, and improving the service life of the battery cells; 4) The immersion liquid flows through the support and flows into the battery pack through the liquid inlet and outlet holes on the support, and the support supports multiple battery modules. That is to say, when the immersion liquid flows in the support, the support is equivalent to a liquid cooling plate and dissipates heat from the bottom of the battery cell in the battery pack. When the immersion liquid flows into the battery pack through the liquid inlet and outlet holes on the support, the immersion liquid dissipates heat around the battery cell. That is, the two heat dissipation methods of liquid cooling and immersion are combined to improve the heat dissipation efficiency of the battery cell in the battery pack.

[0016] As a preferred embodiment of the present invention, it also includes two cross beams for fixing the battery module, the two cross beams are respectively located at both ends of the battery module and connected to the end plates on the battery module, the cross beams are respectively connected to the upper surface of the support member and the inner wall of the frame, the cross beams, the support member, and the frame are enclosed to form a fourth accommodating cavity open at the top, and the second liquid return hole is located on the outside of the cross beam close to the partition.

[0017] Beneficial effect: The second liquid return hole is located on the outside of the crossbeam, that is, on the outside of the battery module, that is, on the outside of the fourth accommodating chamber, so that there is always a certain amount of immersion liquid in the fourth accommodating chamber, which can quickly dissipate heat for each battery cell and ensure that the new immersion liquid always enters the fourth accommodating chamber and contacts each battery cell before flowing to the second liquid return hole, so as to fully and efficiently utilize the immersion liquid without allowing the immersion liquid to flow directly to the second liquid return hole after passing through the liquid outlet hole.

[0018] As a preferred embodiment of the present invention, a plurality of support bars arranged along the length direction of the support member are provided on the upper surface of the support member at intervals along the width direction of the support member, and the plurality of support bars are used to support the battery module, and the plurality of liquid outlets are located between corresponding adjacent battery modules and adjacent support bars, and both ends of the support bars are away from the cross beam connected to the middle end plate of the battery module.

[0019] Beneficial effect: The support bar can increase the safety distance between the battery module and the bottom plate. The support bar allows a gap between the lower surface of the battery cell and the upper surface of the support member. At the same time, both ends of the support bar are far away from the cross beam, that is to say, different battery modules are connected below, so that the immersion liquid flowing into the battery compartment from different liquid outlets can be fully mixed while contacting the battery cell. Conventional immersion liquid is usually located between adjacent battery modules, or through a specially arranged pipeline above the battery cell for the immersion liquid to flow between the battery modules. The support bar of the present invention is located below the battery cell. Compared with a specially arranged pipeline above the battery cell, it occupies less space and can allow the battery cells in multiple groups of battery modules to be completely immersed in the immersion liquid, thereby improving the heat dissipation efficiency and ensuring the uniformity of temperature between the battery cells.

[0020] As a preferred embodiment of the present invention, the support member includes a bottom plate, a flow channel portion for the flow of immersion liquid, the flow channel portion includes a first main channel for liquid inlet, a plurality of mutually parallel branch channels, and a second main channel for liquid outlet, the branch channels are perpendicular to and connected to the first main channel, the first main channel, the plurality of branch channels, and the second main channel are all in contact with the bottom plate, the plurality of liquid outlet holes are all located at the joint between the bottom plate and the first main channel, and at the joint between the bottom plate and the branch channels, the liquid inlet hole is located at the joint between the first main channel and the bottom plate, and the second liquid return hole and the first liquid return hole are both located at the joint between the second main channel and the bottom plate.

[0021] Beneficial effect: The design of the bottom plate and the flow channel portion ensures that stable support can be provided for multiple battery modules and that immersion liquid can pass through. The flow channel portion can also enhance the support of the bottom plate for multiple battery modules. Multiple branch flow channels are parallel to each other, and the branch flow channels are perpendicular to and connected with the first main flow channel. The liquid outlet holes are located at the joints between the bottom plate and the first main flow channel, and at the joints between the bottom plate and the branch flow channels. That is, multiple liquid outlet holes are distributed in rows on the support member, ensuring that the immersion liquid flows to each battery cell in the battery pack through the liquid outlet holes at the same time, while dissipating heat for each battery cell.

[0022] As a preferred embodiment of the present invention, a limiting portion close to the box cover is provided at the connection between the partition and the frame, the upper surface of the limiting portion is parallel to the upper surface of the frame, the limiting portion, the frame and the partition are combined to form a third accommodating cavity open at the top, a flow guide tube is provided on the partition, one end of the flow guide tube is connected to the third accommodating cavity, and the other end is located outside the frame, and a pipe cap is provided at the end of the flow guide tube located outside the frame.

[0023] Beneficial effects: The upper surface of the limiting part is parallel to the upper surface of the frame, and the limiting part is close to the box cover, and the limiting part, the frame, and the partition together form a third accommodating chamber with an open top, which can measure the height of the immersion liquid. When the immersion liquid in the battery pack flows into the third accommodating chamber, it means that the immersion liquid in the battery pack has reached the limit height, and the flow rate of the immersion liquid entering the battery pack needs to be controlled.

[0024] A second object of the present invention is to provide an energy storage cabinet, including the submerged battery pack described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a partial exploded view of the immersed battery pack of the present invention; Figure 2 It is a schematic structural diagram of a flow guide member in an immersion battery pack of the present invention; Figure 3 It is a schematic diagram of the structure at position A of the present invention; Figure 4 It is a schematic diagram of a partial structure of the immersed battery pack of the present invention from another angle; Figure 5 It is a schematic diagram of the structure at position B of the present invention; Figure 6 It is a schematic diagram of the structure of the battery module and the heat insulation member in the immersed battery pack of the present invention; Figure 7 It is a schematic diagram of the structure at position C of the present invention; Figure 8 It is a schematic diagram of the structure of the box in the immersed battery pack of the present invention; Fig. 9 It is a schematic diagram of the structure of a part of the support member in the submerged battery pack of the present invention; Fig.10 It is a schematic structural diagram of another angle of the box body in the immersed battery pack of the present invention; Fig.11 It is a structural schematic diagram of another angle of the box body in the immersed battery pack of the present invention; Fig.12 It is a structural schematic diagram of another part of the support member in the submerged battery pack of the present invention; Fig.13 It is a schematic diagram of the structure of a submerged battery pack of the present invention from another angle; Fig.14 It is a schematic diagram of the structure of a part of the immersed battery pack of the present invention from another angle. DETAILED DESCRIPTION

[0026] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0027] In the description of the present application, the terms "first", "second", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0029] The reference numerals include: liquid inlet 1, first liquid return hole 2, second liquid return hole 3, liquid outlet 4, bottom plate 5, first main channel 61, branch channel 62, first branch channel 621, second branch channel 622, third branch channel 623, fourth branch channel 624, second main channel 63, reinforcing rib 7, support bar 8, frame 9, partition 10, limit part 11, battery module 12, cross beam 13, guide member 14, through hole 141, battery cell 15, heat insulation member 16, first connecting part 161, second connecting part 162, insulating sheet 17, steel belt 18, box body 19, box cover 20, guide tube 21.

[0030] like Figure 1-14 As shown, the immersed battery pack, such as Figure 1 As shown, it includes a box body 19, a partition 10 located in the box body 19, a box cover 20, and multiple battery modules 12 located in the box body 19. The box body 19 includes a frame body 9, a support member for supporting the multiple battery modules 12 and for the immersion liquid to flow through, and two cross beams 13 for fixing the battery modules 12. The frame body 9 and the support member are connected to form a receiving cavity. In this embodiment, the frame body 9 is a hollow cylinder with a square cross section. Figure 8 As shown, the support member includes a bottom plate 5 , a flow channel portion for the flow of immersion liquid, and a reinforcing rib 7 located below the bottom plate 5 .

[0031] like Fig.11 As shown, a plurality of support bars 8 arranged along the length direction of the support member are provided at intervals along the width direction of the support member on the upper surface of the bottom plate 5 . The plurality of support bars 8 are used to support the battery module 12 . In this embodiment, there are a total of eight support bars 8 and a total of four groups of battery modules 12 .

[0032] like Fig. 9As shown, the flow channel portion includes a first main channel 61 for liquid inlet, a plurality of mutually parallel branch channels 62, and a second main channel 63 for liquid outlet. The first main channel 61 and the second main channel 63 are both L-shaped. The vertical portion of the first main channel 61 is arranged along the center line of the width direction of the bottom plate 5, and the vertical portion of the first main channel 61 is in contact with the vertical portion of the second main channel 63. In this embodiment, there are a total of four branch channels 62, namely a first branch channel 621, a second branch channel 622, a third branch channel 623, and a fourth branch channel 624. The first branch channel 621, the second branch channel 622, the third branch channel 623, and the fourth branch channel 624 are respectively perpendicular to and connected to the vertical portion of the first main channel 61.

[0033] In the present embodiment, the vertical portion of the first main channel 61 is arranged along the center line in the width direction of the bottom plate 5, and the multiple branch channels are respectively perpendicular to and connected with the vertical portion of the first main channel 61, so that the immersion liquid flows to each battery cell through the vertical portion of the first main channel 61 and the branch channels, ensuring that the immersion liquid can flow into the battery pack at the fastest speed and contact each battery cell. In addition, because the temperature of the battery cells in the middle of the battery pack is higher than that of the battery cells close to the side walls of the box, the immersion liquid flows from the first main channel 61 to the branch channels, which can first dissipate heat for the battery cells in the middle of the battery pack, thereby improving the heat dissipation efficiency of the battery cells in the middle of the box and preventing thermal runaway of the battery cells in the middle of the battery pack due to untimely heat dissipation.

[0034] In this embodiment, the first main flow channel 61 , the first branch flow channel 621 , the second branch flow channel 622 , the third branch flow channel 623 , the fourth branch flow channel 624 , and the second main flow channel 63 are all in contact with the bottom plate 5 .

[0035] like Figure 9-10 As shown, a liquid inlet hole 1 located outside the frame 9 is provided at the joint between the horizontal portion of the first main channel 61 and the bottom plate 5, a plurality of liquid outlet holes 4 located inside the frame 9 are provided at the joint between the vertical portion of the first main channel 61 and the bottom plate 5, a plurality of liquid outlet holes 4 located inside the frame 9 are provided at the joint between the first branch channel 621, the second branch channel 622, the third branch channel 623, and the fourth branch channel 624 and the bottom plate 5, a second liquid return hole 3 located inside the frame 9 is provided at the joint between the vertical portion of the second main channel 63 and the bottom plate 5, and a first liquid return hole 2 located outside the frame 9 is provided at the joint between the horizontal portion of the second main channel 63 and the bottom plate 5.

[0036] In this embodiment, four liquid outlet holes 4 are provided at the joint between the vertical portion of the first main channel 61 and the bottom plate 5, and the first branch channel 621, the second branch channel 622, the third branch channel 623, and the fourth branch channel 624 are located on both sides of the vertical portion of the first main channel 61, and two liquid outlet holes 4 are symmetrically provided. The liquid outlet holes 4 are all located between two adjacent groups of battery modules 12.

[0037] like Fig.12As shown, in this embodiment, the immersion liquid flows into the battery pack through the liquid inlet hole 1 and multiple liquid outlet holes 4. After the immersion liquid dissipates the heat for the battery cell, it flows out of the battery pack through the second liquid return hole 3 and the first liquid return hole 2 on the support. The liquid inlet hole 1, the liquid outlet hole 4, the second liquid return hole 3, and the first liquid return hole 2 on the support form a path for the flow of immersion liquid for dissipating the heat for the battery cell.

[0038] like Fig.13 As shown, in this embodiment, the ratio of the distance L1 between the first branch channel 621 and the end of the battery module 12 away from the second liquid return hole 3 to the length L of the entire battery module 12 is in the range of 0.12~0.15, the ratio of the distance L2 between the second branch channel 622 and the end of the battery module 12 away from the second liquid return hole 3 to the length L of the entire battery module 12 is in the range of 0.27~0.34, the ratio of the distance L3 between the third branch channel 623 and the end of the battery module 12 away from the second liquid return hole 3 to the length L of the entire battery module 12 is in the range of 0.43~0.53, and the ratio of the distance L4 between the fourth branch channel 624 and the end of the battery module 12 away from the second liquid return hole 3 to the length L of the entire battery module 12 is in the range of 0.73~0.9.

[0039] In this embodiment, the immersion liquid enters the battery pack from the liquid outlet 4. By setting the positions of the flow channels, it can be ensured that the immersion liquid flows from the rear of the battery module to the front of the battery module, taking away more heat, while also taking into account the consistency of the battery cell temperature. Since the immersion liquid flows from the rear of the battery module to the front of the battery module, the distance between the third branch channel 623 and the fourth branch channel 624 is larger than the distance between the first branch channel 621 and the second branch channel 622, and between the second branch channel 622 and the third branch channel 623. While ensuring the strength of the support, the immersion liquid entering the battery pack can first dissipate the heat for the battery cell as much as possible before flowing to the second liquid return hole, thereby improving the heat dissipation efficiency.

[0040] like Fig.10 As shown, in this embodiment, the reinforcing rib 7 is respectively connected to the first branch channel 621, the second branch channel 622, the third branch channel 623, and the fourth branch channel 624, as well as the horizontal and vertical portions of the first main channel 61 and the second main channel 63. The first main channel 61, the second main channel 63, the first branch channel 621, the second branch channel 622, the third branch channel 623, the fourth branch channel 624, and the lower surface of the reinforcing rib 7 are all located in the same horizontal plane, as shown in FIG. Fig.14 As shown, the channel heights H of the first main channel 61 , the second main channel 63 , the first branch channel 621 , the second branch channel 622 , the third branch channel 623 , and the fourth branch channel 624 are all greater than or equal to 4 mm.

[0041] like Figure 8 , 11As shown, the cross beam 13 is connected to the upper surface of the bottom plate 5 and the inner wall of the frame 9 respectively. The cross beam 13, the bottom plate 5 and the frame 9 enclose a fourth accommodating cavity open at the top. The second liquid return hole 3 is located between the partition 10 and the cross beam 13.

[0042] The partition 10 is connected to the upper surface of the bottom plate 5 and the inner wall of the frame 9 respectively. The box cover 20, the partition 10, the frame 9 and the bottom plate 5 cooperate to divide the accommodating cavity into two closed battery compartments for accommodating multiple battery cells and an electrical compartment for accommodating electrical components. Multiple liquid outlets 4 and the second liquid return hole 3 are all located in the battery compartment. The immersion liquid flows into the battery compartment through the liquid inlet hole 1 and the multiple liquid outlet holes 4, and flows out of the battery compartment through the second liquid return hole 3 and the first liquid return hole 2. The immersion liquid, the liquid inlet hole 1, the liquid outlet hole 4, the second liquid return hole 3 and the first liquid return hole 2 cooperate to dissipate heat for the battery cells 15 in the battery pack.

[0043] The partition of the present invention can divide the space in the box into two parts, and combined with the box cover, two closed battery compartments and electrical compartments can be formed inside the battery pack, so that multiple battery cells and multiple electrical components in the battery pack are physically isolated, and the immersion liquid can only immerse the battery cells, thereby avoiding damage to the electrical components, and the immersion liquid can be reasonably used to reduce the use cost; Conventional immersion liquid flows from top to bottom along the height direction of the box body, and its immersion liquid inlet pipe will pass through multiple electrical components, that is, it will pass through the electrical compartment, which will occupy the internal space of the electrical compartment. In the present invention, the immersion liquid flows in and out from the bottom of the battery compartment. Combined with the design of the battery compartment and the electrical compartment, it can ensure the physical isolation of multiple battery cells and multiple electrical components while reducing the occupation of the internal space of the electrical compartment.

[0044] An exhaust pipe for exhaust is provided on the partition 10, one end of the exhaust pipe is connected to the first accommodating cavity, and the other end is located outside the frame 9. A valve is provided at the end of the exhaust pipe located outside the frame 9. When the immersion liquid enters the battery pack, there is air in the battery pack. The exhaust pipe can discharge the original air in the battery pack, which can prevent the air from squeezing the battery pack body, thereby preventing the battery pack body from deformation.

[0045] like Figure 8 As shown, a limiting portion 11 close to the box cover is provided at the connection between the inner surface of the partition 10 (the surface of the partition 10 close to the battery module) and the frame 9, the upper surface of the limiting portion 11 is parallel to the upper surface of the frame 9, and the upper surface of the limiting portion 11 is located below the upper surface of the frame 9, the limiting portion 11, the frame 9, and the partition 10 are enclosed to form a third accommodating cavity open at the top, and a flow guide tube is provided on the partition 10, one end of the flow guide tube is connected to the third accommodating cavity, and the other end is located outside the frame 9, and a pipe cap is provided at the end of the flow guide tube located outside the frame 9.

[0046] In this embodiment, the limiting portion 11 is a limiting plate, and the limiting plate is connected to the inner surface of the frame 9 and the partition plate 10 respectively.

[0047] In this embodiment, the electrical component may be a battery management system, an explosion-proof pressure relief valve, a fuse, an aerosol fire extinguisher, etc.

[0048] like Figure 4 As shown, in the present embodiment, there are four groups of battery modules 12 in total, each group of battery modules 12 includes a plurality of battery cells 15, a plurality of flow guides 14 respectively located between adjacent battery cells 15, and two steel belts 18 for connecting the plurality of battery cells 15 and the plurality of flow guides 14 together, two cross beams 13 are respectively located at both ends of the battery module 12 and connected to the end plates on the battery module 12, a plurality of liquid outlet holes 4 are all located between corresponding adjacent battery modules 12 and adjacent support bars 8, and both ends of the support bars 8 are away from the cross beams 13 connected to the end plates in the battery module 12.

[0049] like Figure 5 As shown, in this embodiment, an insulating sheet 17 is provided between an opposite surface of the flow guide 14 in the length direction and the side surface of the corresponding battery cell 15 .

[0050] The opposite sides of the flow guide 14 in the length direction are respectively in contact with the side surfaces of the corresponding battery cells 15. Figure 2 , 3 As shown, a plurality of through holes 141 arranged at intervals along the height direction of the guide member 14 are provided on the side surface in the width direction of the guide member 14. The through holes 141 are used for the immersion liquid to flow from one outer side of the battery cell 15 to the other outer side of the battery cell 15. The immersion liquid dissipates heat for the opposite surfaces of the adjacent battery cells 15 through the guide member 14. In this embodiment, the upper surface of the guide member 14 is located below the upper surface of the battery cell 15, and the lower surface of the guide member 14 is located above the lower surface of the battery cell 15.

[0051] like Figure 6 , 7 As shown, two steel strips 18 are respectively close to the pole of the battery cell 15 and the bottom of the battery cell 15, and the immersion liquid flows into the battery compartment from the bottom of the battery compartment. The battery module 12 is provided with a heat insulating member 16 that is in contact with the bottom and side surfaces of the lower ends of multiple battery cells 15. The heat insulating member 16 is in contact with the outer surface of the steel strip 18 close to the bottom of the battery cell 15, the lower surface of the guide member 14 is located above the heat insulating member 16, and the upper surface of the guide member 14 is located below the upper surface of the battery cell 15.

[0052] The thermal insulation member 16 includes a first connection portion 161 and second connection portions 162 respectively located at both ends of the first connection portion 161. The first connection portion 161 is bonded to the lower surfaces of the plurality of battery cells 15, and the two second connection portions 162 are respectively bonded to the steel strips 18 located near the bottom of the battery cells 15 and in the width direction of the battery cells 15.

[0053] In this embodiment, the cooperation between the support bar 8 and the thermal insulation member 16 can further increase the distance between the lower surface of the battery cell 15 and the bottom plate 5, that is, increase the distance between the lower part of the battery cell 15 and the immersion liquid just entering the battery pack, and can assist the thermal insulation member 16 to reduce the temperature difference between the upper part of the battery cell 15 and the lower part of the battery cell 15, thereby ensuring the temperature uniformity of the battery cell 15 itself and improving the service life of the battery cell 15.

[0054] Energy storage cabinet, including the submerged battery pack mentioned above. The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An immersion battery pack, comprising a box, characterized in that: It also includes multiple groups of battery modules located in a box body, the box body includes a support member for supporting the multiple groups of battery modules and for the circulation of immersion liquid, the battery module includes multiple battery cells, the battery module is provided with a heat insulating member that is in contact with the bottom and side surfaces of the lower ends of the multiple battery cells, and the support member is provided with multiple liquid outlet holes for the immersion liquid to flow into the battery pack.

2. The submerged battery pack according to claim 1, characterized in that: The battery module also includes a plurality of flow guides respectively located between adjacent battery cells. The flow guides are provided with a plurality of through holes for the immersion liquid to flow through in the height direction. The immersion liquid dissipates heat for the opposite surfaces of adjacent battery cells through the flow guides.

3. The submerged battery pack according to claim 2, characterized in that: The battery module also includes two steel belts for connecting multiple battery cells and multiple flow guides together, the two steel belts are respectively close to the battery cell poles and the bottom of the battery cell, the thermal insulation is in contact with the outer surface of the steel belt close to the bottom of the battery cell, the lower surface of the flow guide is located above the thermal insulation, and the upper surface of the flow guide is located below the upper surface of the battery cell.

4. The submerged battery pack according to claim 3, characterized in that: The thermal insulation member includes a first connecting portion and second connecting portions located at both ends of the first connecting portion, the first connecting portion is bonded to the lower surfaces of multiple battery cells, and the two second connecting portions are respectively bonded to steel strips close to the bottom of the battery cells and located in the width direction of the battery cells.

5. The submerged battery pack according to claim 1, characterized in that: The box also includes a box cover, and the box also includes a frame and a partition located inside the box. The frame and the support are connected to form a accommodating cavity. The partition is respectively connected to the inner wall of the frame and the upper surface of the support. The box cover, partition, frame and support cooperate to divide the accommodating cavity into two closed battery compartments and electrical compartments, respectively. The support also includes a liquid inlet hole, a first liquid return hole and a second liquid return hole located outside the frame, and the liquid outlet hole is located outside the frame. The immersion liquid flows into the battery compartment through the liquid inlet hole and multiple liquid outlet holes to immerse the battery cells. After the immersion liquid dissipates the heat for the battery cells, it flows out of the battery pack through the second liquid return hole and the first liquid return hole on the support. The liquid inlet hole, liquid outlet hole, second liquid return hole and first liquid return hole on the support form a path for the immersion liquid to flow for dissipating the heat for the battery cells.

6. The submerged battery pack according to claim 5, characterized in that: It also includes two cross beams for fixing the battery module, the two cross beams are respectively located at the two ends of the battery module and connected to the end plates on the battery module, the cross beams are respectively connected to the upper surface of the support member and the inner wall of the frame, the cross beams, the support member and the frame together form a fourth accommodating cavity open at the top, and the second liquid return hole is located on the outer side of the cross beam close to the partition.

7. The submerged battery pack according to claim 5, characterized in that: The upper surface of the support member is provided with a plurality of support bars arranged along the length direction of the support member at intervals along the width direction of the support member. The plurality of support bars are used to support the battery module. The plurality of liquid outlets are located between corresponding adjacent battery modules and adjacent support bars. Both ends of the support bars are away from the crossbeam connected to the middle end plate of the battery module.

8. The submerged battery pack according to claim 5, characterized in that: The support member includes a bottom plate and a flow channel portion for the flow of immersion liquid, the flow channel portion includes a first main channel for liquid inlet, a plurality of mutually parallel branch channels, and a second main channel for liquid outlet, the branch channels are perpendicular to and connected with the first main channel, the first main channel, the plurality of branch channels, and the second main channel are all in contact with the bottom plate, the plurality of liquid outlet holes are all located at the joint between the bottom plate and the first main channel, and at the joint between the bottom plate and the branch channels, the liquid inlet hole is located at the joint between the first main channel and the bottom plate, and the second liquid return hole and the first liquid return hole are both located at the joint between the second main channel and the bottom plate.

9. The submerged battery pack according to claim 5, characterized in that: A limiting portion close to the box cover is provided at the connection between the partition and the frame, and the upper surface of the limiting portion is parallel to the upper surface of the frame. The limiting portion, the frame and the partition are combined to form a third accommodating cavity open at the top. A flow guide tube is provided on the partition, one end of the flow guide tube is connected to the third accommodating cavity, and the other end is located outside the frame. A pipe cap is provided at the end of the flow guide tube located outside the frame.

10. Energy storage cabinet, characterized in that: Including the immersed battery pack described in any one of claims 1-9.

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