Battery liquid cooling plate and battery pack box body structure

Abstract

The invention provides a battery liquid cooling plate and a battery pack box body structure, the battery liquid cooling plate comprises a plurality of mother pipes which are arranged side by side and are connected in sequence, the plurality of mother pipes are internally provided with internal cooling liquid flow channels, a first end of a first mother pipe in two adjacent mother pipes is provided with a cooling liquid inlet and a cooling liquid outlet, and a second end of a second mother pipe in two adjacent mother pipes is provided with a cooling liquid outlet; an inter-pipe cooling liquid circulation channel is arranged between the first mother pipe and the second mother pipe in the two adjacent mother pipes; cooling liquid entering the cooling liquid inlet passes through the internal cooling liquid flow channel and the inter-pipe cooling liquid circulation channel and returns to the cooling liquid outlet to flow out. Each of the plurality of mother pipes comprises a plurality of battery accommodating cavities which are arranged in sequence, and the battery accommodating cavity between the first end part and the second end part of the mother pipe is formed by outwards extending two transverse bulges which are arranged oppositely from the mother pipe. According to the scheme, the heat dissipation area, the temperature uniformity, the structural stability and the integration reliability of the battery can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery thermal management, in particular to a battery liquid cooling plate and a battery pack box structure. BACKGROUND

[0002] With the rapid development of electric vehicles and large-scale energy storage markets, power battery systems are evolving towards higher energy density, faster charging speed and higher safety and reliability. Cylindrical batteries are widely used in various battery modules due to their good consistency, high production efficiency and good mechanical strength. However, when a large number of cylindrical batteries are integrated at high density, the heat generated during operation cannot be effectively dissipated, which will cause uneven temperature distribution and local overheating in the module, not only accelerating the performance degradation and shortening the service life of the battery, but also possibly causing thermal runaway, which seriously threatens the safety of the system.

[0003] Liquid cooling technology is one of the mainstream and efficient means of battery thermal management. Traditional liquid cooling plates are usually independent plate-shaped structures that conduct heat by contacting the outer surface of the battery monomer. However, for cylindrical batteries, the curved surface shape and the flat liquid cooling plate are mostly in line contact or small area contact, which has the inherent disadvantages of limited contact area and large contact thermal resistance, which seriously restricts the improvement of heat exchange efficiency. In order to improve the contact, some solutions introduce heat-conducting gel or complex mechanical clamping structures, but this increases the complexity, cost and additional weight of the system.

[0004] In addition, in the design of the module structure, how to accurately and reliably fix a large number of cylindrical battery monomers and achieve close coupling with the liquid cooling channel is a key challenge. Existing bundled and bracketed structures often separate battery fixation and thermal management into two relatively independent systems, resulting in complex structure, numerous components, low space utilization, and difficulty in meeting the growing demand for compactness, lightweight and high reliability. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a battery liquid cooling plate and a battery pack box structure. The present application can improve the heat dissipation area, temperature uniformity, structural stability and integration reliability of the battery.

[0006] To solve the above technical problems, the technical solutions of the present application are as follows: A battery liquid cooling plate, comprising: a plurality of mother pipes arranged side by side and sequentially connected, the plurality of mother pipes having an internal cooling liquid flow channel inside, a first end of a first mother pipe of the adjacent two mother pipes being provided with a cooling liquid inlet and a cooling liquid outlet, the first mother pipe and a second mother pipe of the adjacent two mother pipes having a pipe intercooling liquid flow passage; the cooling liquid entering the cooling liquid inlet passes through the internal cooling liquid flow channel and the pipe intercooling liquid flow passage, and flows out from the cooling liquid outlet; Each of the plurality of mother tubes includes: a plurality of battery accommodating cavities arranged in sequence, the plurality of battery accommodating cavities being integrally formed, the battery accommodating cavities located at the first end and the second end of the mother tube being cylindrical accommodating cavities with openings in the sidewalls, and the openings facing the adjacent battery accommodating cavities, the battery accommodating cavity between the first end and the second end of the mother tube being formed by two oppositely arranged transverse protrusions extending outward from the mother tube respectively.

[0007] Optionally, each main tube has a baffle extending along its length inside, which divides the internal coolant flow channels of the main tube into an upper first flow channel and a lower second flow channel that are independent and parallel to each other.

[0008] Optionally, each mother tube has a flow chamber at its end, which connects the first flow channel and the second flow channel; the coolant inlet is connected to the end of the upper first flow channel, and the coolant outlet is connected to the end of the lower second flow channel; the flow end has a U-shaped flow chamber inside, which connects the end of the upper first flow channel and the end of the lower second flow channel; the coolant enters the upper first flow channel from the coolant inlet, flows along the length of the coolant to the flow end, turns after passing through the U-shaped flow chamber, enters the lower second flow channel, and flows back in the opposite direction to the upper first flow channel, and is discharged from the coolant outlet, forming a series of two-way return paths.

[0009] Optionally, the outer edge contour of the transverse protrusion that contacts the battery is concave arc-shaped to adapt to the curvature of the cylindrical battery.

[0010] Optionally, there is a preset distance between the two oppositely arranged transverse protrusions in each battery accommodating cavity.

[0011] Optionally, the longitudinal section of the transverse projection is plate-shaped.

[0012] Optionally, all the main tubes are U-shaped and have a flat cross-section.

[0013] Optionally, the spacing between the transverse protrusions of the at least two battery accommodating cavities is equal.

[0014] Embodiments of the present invention also provide a battery pack housing structure, including the battery liquid cooling plate as described above, and further comprising: A battery pack housing that shares a wall with the battery liquid cooling plate, and an electrical connector panel is provided at the end of the battery pack housing; A base plate that is fixedly connected to the bottom surface of the battery liquid cooling plate.

[0015] Optionally, the base plate is connected to the battery pack housing via lugs.

[0016] The above-described technical solution of the present invention has at least the following technical effects: The battery liquid cooling plate of the present invention comprises multiple mother tubes arranged side-by-side and sequentially connected. Each mother tube has an internal coolant flow channel. The first end of a first mother tube in a pair of adjacent mother tubes has a coolant inlet and a coolant outlet. An inter-tube coolant flow channel exists between the first mother tube and the second mother tube in a pair of adjacent mother tubes. Coolant entering the coolant inlet flows through the internal coolant flow channel and the inter-tube coolant flow channel, returning to the coolant outlet. Each mother tube includes multiple sequentially arranged battery accommodating cavities, integrally formed. The battery accommodating cavities at the first and second ends of the mother tube are cylindrical accommodating cavities with openings in the sidewalls, and these openings face the adjacent battery accommodating cavities. The battery accommodating cavity between the first and second ends of the mother tube is formed by two opposing transverse protrusions extending outward from the mother tube. This design improves the battery's heat dissipation area, temperature uniformity, structural stability, and integrated reliability. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the battery liquid cooling plate of the present invention; Figure 2 This is a side cross-sectional view of the battery liquid cooling plate of the present invention; Figure 3 This is a top view schematic diagram of the battery liquid cooling plate of the present invention; Figure 4 This is a schematic diagram of the assembly process of the battery pack housing structure of the present invention; Figure 5 This is a schematic diagram of the battery pack housing structure of the present invention.

[0018] Explanation of reference numerals in the attached figures: 11-First main tube; 12-Second main tube; 2-Transverse protrusion; 3-Baffle; 41-First flow channel; 42-Second flow channel; 51-Coolant inlet; 52-Coolant inlet; 6-Flow end; 61-Flow cavity; 7-Battery housing cavity; 200-Battery pack housing; 201-Outer wall surface; 202-Electrical connector panel; 203-Ear; 300-Base plate. Detailed Implementation

[0019] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0020] like Figure 1 As shown, an embodiment of the present invention provides a battery liquid cooling plate, comprising: Multiple main pipes are arranged side by side and connected sequentially. Each main pipe has an internal coolant flow channel. The first end of the first main pipe 11 in two adjacent main pipes is provided with a coolant inlet 51 and a coolant outlet 52. There is an inter-pipe coolant flow channel between the first main pipe 11 and the second main pipe 12 in two adjacent main pipes. The coolant entering the coolant inlet 51 flows through the internal coolant flow channel and the inter-pipe coolant flow channel and returns to the coolant outlet 52 to flow out. Each of the plurality of mother tubes includes: a plurality of battery accommodating cavities 7 arranged in sequence, the plurality of battery accommodating cavities 7 being integrally formed, the battery accommodating cavities at the first end and the second end of the mother tube being cylindrical accommodating cavities with openings in the sidewalls, and the openings facing the adjacent battery accommodating cavities, the battery accommodating cavity between the first end and the second end of the mother tube being formed by two oppositely arranged transverse protrusions 2 extending outward from the mother tube respectively.

[0021] In this embodiment, as Figure 1 As shown, in the battery liquid cooling plate, multiple mother tubes are arranged side by side and connected sequentially. The mother tubes include a first mother tube and at least one second mother tube. Multiple transverse protrusions 2 are provided on the side walls of the first mother tube 11 and the second mother tube 12. The transverse protrusions 2 are arranged at equal intervals along the length direction of the side wall surface of the mother tube with a height of 95mm. In order to firmly hold the battery, the distance between the centers of adjacent transverse protrusions, i.e. the axial length of a slot unit, is designed to be 50mm. This dimension is slightly larger than the diameter of the battery, forming a gap with a width of 4mm between the two individual batteries. The first end of the first main tube 11 is provided with a coolant inlet 51 and a coolant outlet 52. The inner diameter of the inlet and outlet water-cooling connectors is 8mm and the wall thickness is 1.5mm. The second end of the first main tube 11 and the end of the second main tube 12 are closed flow ends 6, and the flow ends 6 form a U-shaped flow cavity. The wall thickness of the first main tube 11 and the second main tube 12 is uniformly 0.5mm, which achieves lightweight and optimal thermal conductivity while ensuring pressure resistance and structural strength. The length of the liquid cooling plate depends on the number of cylindrical battery cells in a single row. The first mother tube 11 and multiple second mother tubes 12 are arranged in parallel and interconnected to form a serpentine channel, forming a cylindrical gap between the battery liquid cooling plates. Multiple cylindrical batteries are placed in the gap in a staggered manner, and the cylindrical surface of each battery makes full-height large-area contact with the side wall of the liquid cooling plate. This design maximizes the contact surface between a single battery and the liquid cooling plate, and the heat exchange effect far exceeds that of traditional solutions.

[0022] The present invention integrates liquid cooling with battery support and positioning structure through biomimetic principles. It is a novel liquid cooling solution that is highly adaptable to the shape of cylindrical batteries and combines efficient heat exchange with structural functionality. It solves the problems of insufficient heat exchange area, complex structure and low space utilization in the prior art, reduces the probability of thermal runaway, and achieves efficient, compact and reliable thermal management and structural integration.

[0023] like Figure 2 As shown, in an optional embodiment of the present invention, a baffle 3 is provided inside each mother tube along the length direction, the baffle 3 dividing the internal coolant flow channel of the mother tube into an upper first flow channel 41 and a lower second flow channel 42 that are independent and parallel to each other.

[0024] In this embodiment, as Figure 2 As shown, a 1mm thick partition 3 separates the flow channels inside the first main tube 11 and the second main tube 12 into two parallel flat flow channels. This unique flat flow channel design with a large aspect ratio significantly increases the contact area with the battery and allows the coolant to flow in a thin layer, thus enhancing the heat exchange efficiency.

[0025] like Figure 1 , Figure 2 As shown, in an optional embodiment of the present invention, each mother tube is provided with a flow chamber 61 at its end, the flow chamber 61 connecting the first flow channel 41 and the second flow channel 42; the coolant inlet 51 is connected to the end of the upper first flow channel 41, and the coolant outlet 52 is connected to the end of the lower second flow channel 42; the flow end 6 is internally configured with a U-shaped flow chamber 61 for connecting the end of the upper first flow channel 41 with the end of the lower second flow channel 42; thereby, the coolant flow path is constructed as follows: the coolant enters the upper first flow channel 41 from the coolant inlet 51, flows along the length of the coolant to the flow end 6, turns after passing through the U-shaped flow chamber 61 and enters the lower second flow channel 42, and flows back along the opposite flow direction to the upper first flow channel 41, and finally exits from the coolant outlet 52, thus forming a series two-way return path.

[0026] In this embodiment, as Figure 1 , Figure 2As shown, the coolant inlet 51 is connected to the end of the first flow channel 41, and the coolant outlet 52 is connected to the end of the second flow channel 42; the flow end 6 has a U-shaped flow cavity 61 inside, which is used to connect the end of the first flow channel 41 and the end of the second flow channel 42; accordingly, the coolant flow path is constructed as follows: the coolant enters the first flow channel 41 from the coolant inlet 51, flows along the length of the coolant to the flow end 6, turns after passing through the U-shaped flow cavity 61 and enters the second flow channel 42, and flows back along the opposite flow direction to the first flow channel 41, and finally exits from the coolant outlet 52, thereby forming a series of two-way return paths.

[0027] like Figure 1 , Figure 2 As shown, in an optional embodiment of the present invention, the outer edge contour of the transverse protrusion 2 that contacts the battery 100 is concave arc-shaped to adapt to the curvature of the cylindrical battery.

[0028] In this embodiment, as Figure 1 , Figure 2 As shown, the transverse protrusion 2 extends outward from the U-shaped mother tube, and its outer edge contour that contacts the battery 100 is constructed as a concave arc shape to adapt to the curvature of the cylindrical battery. Multiple transverse protrusions 2 and the U-shaped mother tube sections they connect to together enclose a slot 7 naturally formed between adjacent transverse protrusions 2 and on the outer wall of the U-shaped mother tube for accommodating and securing a single battery 100.

[0029] like Figure 1 , Figure 2 As shown, in an optional embodiment of the present invention, there is a preset distance between the two oppositely arranged transverse protrusions 2 of each battery accommodating cavity.

[0030] In this embodiment, as Figure 1 , Figure 2 As shown, on at least one sidewall of the first mother tube 11 and the second mother tube 12, a plurality of outwardly protruding biomimetic structures are periodically and integrally formed along their length direction. These structures are defined as transverse protrusions 2. The transverse protrusions 2 are configured to increase the contact area between the liquid cooling plate and the battery, and at the same time serve as reinforcing ribs to enhance the overall structural rigidity of the U-shaped mother tube.

[0031] like Figure 2 , Figure 3 As shown, in an optional embodiment of the present invention, the longitudinal section of the transverse protrusion 2 is plate-shaped.

[0032] In this embodiment, as Figure 2 , Figure 3As shown, each transverse protrusion 2 extends outward from the flat sidewall of the main tube. Its design is consistent with the flat cross-section and is also a plate-like structure. The highest point of the transverse protrusion is 40mm from the center, and two transverse protrusions form a concave arc with a radius of 23mm.

[0033] like Figure 1 As shown, in an optional embodiment of the present invention, all the mother tubes are U-shaped and have a flat cross-section.

[0034] In this embodiment, as Figure 1 As shown, the main body of the first mother tube 11 and the second mother tube 12 is a U-shaped mother tube. This U-shaped mother tube is defined as a "cone" in biomimetic structures. The cross-section of the U-shaped mother tube is flat, and its sidewall is in contact with the single cell. Its interior forms the main channel for the flow of cooling medium, and undertakes the main functions of heat conduction and support. Preferably, the outer wall width W of the minimum cross-section of the first mother tube 11 and the second mother tube 12 along the length direction is 5mm, and the outer wall height H is 95mm, so as to ensure that it matches the height of the battery and achieves the maximum contact area.

[0035] like Figures 1 to 3 As shown, in an optional embodiment of the present invention, the spacing between the transverse protrusions 2 of the at least two battery accommodating cavities is equal.

[0036] In this embodiment, as Figures 1 to 3 As shown, the transverse processes 2 are evenly distributed, and the interval between two adjacent transverse processes 2 is equal.

[0037] The liquid cooling plate is manufactured in one piece through precision extrusion molding or die casting molding process, forming an integrated component that integrates function and structure; the first mother tube 11 and the second mother tube 12 are made of aluminum alloy material, which has the advantages of being lightweight, high-strength, corrosion-resistant, and easy to process.

[0038] like Figure 4 , Figure 5 As shown, embodiments of the present invention also provide a battery pack housing structure, including the battery liquid cooling plate as described above, and further including: A battery pack housing 200 sharing a wall with the battery liquid cooling plate, and an electrical connector panel 202 provided at the end of the battery pack housing 200; A base plate 300 is fixedly connected to the bottom surface of the battery liquid cooling plate.

[0039] In this embodiment, as Figure 4 , Figure 5As shown, the battery pack housing structure includes a battery liquid cooling plate in the above-described scheme, which is connected to a first main pipe 11 and multiple second main pipes 12, a battery pack housing 200 sharing a wall with the battery liquid cooling plate, and a base plate 300. The first main pipe 11 and multiple second main pipes 12 are arranged in parallel and interconnected to form a serpentine channel for the flow of coolant. Preferably, the outer wall of the serpentine channel is rectangular in shape, with dimensions of 562×240mm and a height of 95mm. The outer wall thickness is 1.5mm, and the inner wall thickness of the liquid cooling plate is 0.5mm. At the first end of the first main pipe 11, the battery pack panel and the liquid cooling plate are integrally cast, that is, the side wall of the liquid cooling plate and the electrical connector panel together form the side wall of the battery pack housing. A base plate is added at the bottom of the liquid cooling plate, which can serve as the base plate of the battery module / battery pack. The battery 100 is embedded and fixed in the battery liquid cooling plate. The battery pack housing 200 has an electrical connector panel 202 at its end, and the bottom plate 300 is fixedly connected to the bottom surface of the battery liquid cooling plate. As a system integration solution, the outer wall surface 201 of the liquid cooling plate, the electrical connector panel 202 and the bottom plate 300 are jointly constructed as the components of the battery pack housing, realizing integrated sharing with the battery pack load-bearing structure.

[0040] like Figure 4 , Figure 5 As shown, in an optional embodiment of the present invention, the base plate 300 is connected to the battery pack housing 200 via the ear piece 203.

[0041] In this embodiment, as Figure 4 , Figure 5 As shown, the base plate 300 is located at the bottom of the core battery array, and its edge is connected to the bottom of the battery liquid cooling plate by tabs 203, together forming a rigid package for accommodating and supporting the core battery array; as Figure 4 As shown, the batteries 100 are arranged in a forked manner to accommodate the installation and fixation of the battery liquid cooling plate; each battery 100 is directly embedded and fastened in the natural slot 7 formed by the adjacent transverse protrusion 2 of a battery liquid cooling plate and the U-shaped mother tube, thereby forming a core battery array.

[0042] The cooling process of this invention is as follows: An ethylene glycol aqueous solution at 25°C is pumped in through the coolant inlet, first entering the upper channel of the cooling plate and flowing along the length of the module to absorb the heat generated by the battery. At the end of the flow path, the coolant flows into a U-shaped flow chamber and then flows into the lower channel in the opposite direction for a second heat exchange, finally exiting from the coolant outlet. This two-way design ensures that the temperature difference between the beginning and end of the module can be controlled within 3°C.

[0043] The load-bearing process of this invention is as follows: mechanical loads such as vibration and impact of the battery pack are directly transmitted to the rigid core composed of liquid-cooled plate and battery through the shared base plate and side plate, avoiding the structural redundancy and weight increase caused by the traditional module "module shell built into battery pack".

[0044] The above-described solution of this invention achieves a high degree of functional integration through biomimetic structural design: it precisely mimics the biological principle of the human spine—"vertebral body bearing weight, transverse processes enhancing stability." The U-shaped main tube, acting as the "vertebral body," provides core support and liquid cooling, while the "transverse processes" significantly increase the contact area with the battery, simultaneously playing a role in precise positioning and enhancing overall structural stability, thus achieving a perfect unity of thermal management and structural functions. This design highly integrates thermal management, structural support, and battery positioning into a single component, achieving a very high power density.

[0045] Doubled heat exchange area and superior temperature uniformity: The contact area is doubled: Traditional liquid cooling plates only contact the battery lines or have a small contact area with the flow channel walls. However, the transverse protrusion structure used in this invention acts as highly efficient "heat-conducting fins," expanding the contact area from a "line" or "small surface" to a wraparound "large surface" contact. The effective heat exchange area increases exponentially, significantly reducing contact thermal resistance, thereby greatly improving the battery's heat dissipation efficiency and reducing the risk of thermal runaway.

[0046] Dual-path flow optimization: The battery simultaneously contacts the two large-area surfaces of the transverse protrusion and the outer wall of the U-shaped main tube, which can quickly and evenly conduct the heat generated by the battery to the core flow channel of the U-shaped main tube and be carried away by the coolant, effectively avoiding local hot spots. At the same time, the series dual-path return path formed by the internal baffles allows the coolant to flow through the battery hot zone twice, ensuring that the heat is carried away evenly and efficiently, significantly improving the axial and circumferential temperature uniformity of the battery module and fundamentally suppressing local overheating.

[0047] The module structure and assembly are extremely simplified: the assembly is streamlined, and the battery can be directly embedded into the natural slot formed by the transverse protrusion and the mother tube. The positioning is precise, eliminating a large number of independent fixing brackets and fasteners. The assembly process is simple and efficient, which is conducive to automated production and reduces manufacturing costs.

[0048] By minimizing connection points, the one-piece liquid cooling plate itself becomes the main structural component, avoiding potential leakage points and mechanical weaknesses caused by the connection of multiple parts, thus improving reliability.

[0049] System-level integration and leapfrog performance improvement: "De-modularization" integration, by sharing the battery pack housing wall with the liquid cooling plate sidewall and the module bottom with the battery pack lower housing base plate, this invention deconstructs the traditional independent "battery module" concept. Its external structure is directly shared with the liquid cooling plate sidewall, thus completely eliminating the need for independent module housings, mounting brackets, and a large number of connectors.

[0050] With a significant reduction in weight and cost, the integrated design achieves extreme simplification at the system level, resulting in significant weight reduction and lower manufacturing costs.

[0051] The energy density is significantly improved. By eliminating redundant structures, the space utilization of the battery pack is maximized, thereby significantly improving the mass energy density and volumetric energy density of the entire battery pack system.

[0052] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery liquid cooling plate, characterized in that, include: Multiple main pipes are arranged side by side and connected in sequence. Each main pipe has an internal coolant flow channel. The first end of the first main pipe (11) of two adjacent main pipes is provided with a coolant inlet (51) and a coolant outlet (52). There is an inter-pipe coolant flow channel between the first main pipe (11) and the second main pipe (12) of the two adjacent main pipes. The coolant entering the coolant inlet (51) flows back to the coolant outlet (52) and out through the internal coolant flow channel and the inter-pipe coolant flow channel. Each of the plurality of mother tubes includes: a plurality of battery accommodating cavities (7) arranged in sequence, the plurality of battery accommodating cavities (7) being integrally formed, the battery accommodating cavities located at the first end and the second end of the mother tube being cylindrical accommodating cavities with openings in the sidewalls, and the openings facing the adjacent battery accommodating cavities, the battery accommodating cavities between the first end and the second end of the mother tube being formed by two oppositely arranged transverse protrusions (2) extending outward from the mother tube respectively.

2. The battery liquid cooling plate according to claim 1, characterized in that, Each main tube has a baffle (3) extending along its length inside, which divides the internal coolant flow channel of the main tube into an upper first flow channel (41) and a lower second flow channel (42) that are independent and parallel to each other.

3. The battery liquid cooling plate according to claim 2, characterized in that, Each end of the main pipe is provided with a flow chamber (61), which connects the first flow channel (41) and the second flow channel (42); the coolant inlet (51) is connected to the end of the upper first flow channel (41), and the coolant outlet (52) is connected to the end of the lower second flow channel (42); the flow end (6) forms a U-shaped flow chamber (61) to connect the end of the upper first flow channel (41) with the end of the lower second flow channel (42); the coolant enters the upper first flow channel (41) from the coolant inlet (51), flows along the length of the coolant to the flow end (6), turns after passing through the U-shaped flow chamber (61) and enters the lower second flow channel (42), and flows back along the opposite flow direction to the upper first flow channel (41), and is discharged from the coolant outlet (52), forming a series of two-way return paths.

4. The battery liquid cooling plate according to claim 1, characterized in that, The outer edge contour of the transverse protrusion (2) that contacts the battery (100) is concave arc-shaped to adapt to the curvature of the cylindrical battery.

5. The battery liquid cooling plate according to claim 1, characterized in that, Each battery housing cavity has a preset distance between two oppositely arranged transverse protrusions (2).

6. The battery liquid cooling plate according to claim 1, characterized in that, The longitudinal section of the transverse protrusion (2) is plate-shaped.

7. The battery liquid cooling plate according to claim 1, characterized in that, All the main tubes are U-shaped and have a flat cross-section.

8. The battery liquid cooling plate according to claim 1, characterized in that, The spacing between the transverse protrusions (2) of the at least two battery accommodating cavities is equal.

9. A battery pack housing structure, characterized in that, Including the battery liquid cooling plate as described in any one of claims 1 to 8, further comprising: A battery pack housing (200) sharing a wall with the battery liquid cooling plate, and an electrical connector panel (202) is provided at the end of the battery pack housing (200). A base plate (300) is fixedly connected to the bottom surface of the battery liquid cooling plate.

10. The battery pack housing structure according to claim 9, characterized in that, The base plate (300) is connected to the battery pack housing (200) via a lug (203).

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