A heat dissipation device for new energy batteries

Abstract

The present application relates to the technical field of battery heat dissipation, and particularly relates to a heat dissipation device for new energy battery, which comprises a plurality of independent liquid cooling units, each of which is used for contacting with the surface of one or a small cluster of battery monomers; at least one connecting base is internally provided with a shunt cavity or a converging cavity; wherein the cooling liquid inlet and outlet of each liquid cooling unit are detachably and sealingly connected to the connecting base, so that the cooling liquid from the shunt cavity can flow through all the liquid cooling units in parallel and then converge into the converging cavity, and the present application has the effects of ensuring uniform distribution of cooling liquid flow and long-term stability of contact thermal resistance by means of a modular parallel liquid cooling structure and a self-adaptive elastic contact interface, and improving the temperature safety and cycle life of the battery pack.

Description

Technical Field

[0001] This invention relates to the technical field of battery heat dissipation, and in particular to a heat dissipation device for new energy batteries. Background Technology

[0002] With the rapid development of new energy vehicles and the large-scale energy storage industry, high-energy-density and high-power-density lithium-ion batteries and other new energy batteries are widely used. If the heat generated by the battery during operation cannot be dissipated in a timely and even manner, it will lead to uneven temperature distribution within the battery pack, accelerate battery aging, affect its performance and safety, and even trigger the risk of thermal runaway. Therefore, efficient and reliable heat dissipation devices are crucial to ensuring the long-term stable operation of battery systems.

[0003] Currently, mainstream battery cooling technologies are mainly divided into two categories: air cooling and liquid cooling. At the mechanical structure level, common air cooling devices typically consist of a heat sink array, air ducts, and a fan. Their working principle is that the fan drives cooling air to flow through the fins attached to the surface of the battery module, carrying away heat through convection. Liquid cooling devices, on the other hand, mostly employ a liquid cooling plate structure. The liquid cooling plate has internal flow channels, is arranged close to the battery surface, and relies on circulating coolant flowing within the channels to absorb and transfer heat.

[0004] Existing technologies suffer from the following problems: In air-cooled devices, the dense fin arrays designed to increase heat dissipation area often obstruct airflow, leading to increased airflow resistance, and creating heat dissipation dead zones in areas far from the air inlet inside the battery pack. The uniformity of contact area and pressure between the fins and the battery surface is difficult to guarantee, resulting in high contact thermal resistance and affecting thermal conductivity. In liquid-cooled devices, complex and meandering flow channels are typically designed within the liquid cooling plate to ensure coolant flows through all battery cells, increasing manufacturing difficulty and cost. Furthermore, the uneven distribution of these flow channels can lead to uneven coolant distribution within the plate, resulting in significant differences in cooling performance at different battery locations. Summary of the Invention

[0005] To address the shortcomings of existing technologies, one of the objectives of this invention is to provide a heat dissipation device for new energy batteries that, through a modular parallel liquid cooling structure and an adaptive elastic contact interface, ensures uniform distribution of coolant flow and long-term stable contact thermal resistance, thereby improving the temperature safety and cycle life of the battery pack.

[0006] The above-mentioned objective of this invention is achieved through the following technical solutions:

[0007] A heat dissipation device for new energy batteries includes;

[0008] Multiple independent liquid cooling units, each of which is used to contact the surface of one or a small cluster of battery cells;

[0009] Two connecting bases, one of which has a flow-dividing cavity inside, and the other connecting base has a flow-combining cavity inside;

[0010] The coolant inlet and outlet of each liquid cooling unit are detachably and sealed to the connecting base, so that the coolant from the diversion chamber can flow in parallel through all the liquid cooling units and then merge into the confluence chamber.

[0011] As a specific embodiment of a heat dissipation device for a new energy battery disclosed in this invention, the interface between the liquid cooling unit and the battery includes an elastic metal film, the inner cavity of the elastic metal film constitutes part of the coolant flow channel, and the outer surface of the elastic metal film is covered with a flexible thermal conductive pad.

[0012] As a specific embodiment of the heat dissipation device for new energy batteries disclosed in this invention, the liquid cooling unit has an inlet and an outlet for coolant at both ends, and a flow guide column is provided inside the liquid cooling unit, with the flow guide column having a smaller cross-section at both ends and a larger cross-section in the middle.

[0013] As a specific embodiment of a heat dissipation device for a new energy battery disclosed in this invention, a mounting block is provided in the middle of the flow guide column, the mounting block is in contact with the inner wall of the inner cavity of the liquid cooling unit, and a plurality of liquid passage holes are opened on the mounting block.

[0014] As a specific embodiment of a heat dissipation device for a new energy battery disclosed in this invention, the connecting base is configured as two sets, one set being a shunt base and the other set being a convergent base;

[0015] The flow distribution base and the flow collection base are located at opposite ends of the liquid cooling unit. Coolant is distributed from the flow distribution base to each of the liquid cooling units, and the flow collection base gathers the coolant that has passed through the liquid cooling units.

[0016] As a specific embodiment of a heat dissipation device for a new energy battery disclosed in this invention, the connecting base includes a mounting plate that fits against the battery cell and a connecting plate with an internal cavity.

[0017] The mounting plate has several battery holes that mate with individual battery cells, and several mounting holes that mate with the liquid cooling unit. Each mounting hole is fitted with a mounting sleeve that passes through the mounting hole and fits against the inner wall of the liquid cooling unit. The two ends of the mounting sleeve are open to form a first liquid hole.

[0018] As a specific embodiment of the heat dissipation device for new energy batteries disclosed in this invention, the connecting plate is provided with a plurality of connecting holes, and a connecting sleeve is interference-fitted in each connecting hole. The connecting sleeve passes through the connecting hole and fits against the inner wall of the mounting sleeve. One end of the connecting sleeve faces the mounting sleeve and the contact surface between the connecting sleeve and the mounting sleeve is a conical surface.

[0019] As a specific embodiment of the heat dissipation device for new energy batteries disclosed in this invention, the connecting sleeve has a cavity in the middle, and the cavity communicates with the cavity of the connecting plate.

[0020] As a specific embodiment of a heat dissipation device for a new energy battery disclosed in this invention, a sealing gasket is provided between the mounting plate and the connecting plate. The sealing gasket has a plurality of second liquid holes, which correspond one-to-one with the first liquid holes. Each connecting sleeve passes through one of the second liquid holes.

[0021] As a specific embodiment of a heat dissipation device for a new energy battery disclosed in this invention, the sealing gasket is provided in multiple ways, and each sealing gasket is provided with one or two rows of the second liquid holes.

[0022] In summary, the present invention has at least one of the following beneficial technical effects:

[0023] 1. The heat dissipation device disclosed in this invention significantly improves the temperature uniformity and thermal management reliability of the battery pack. By decomposing the heat dissipation task of the battery pack into multiple independent liquid cooling units and using a shunt base and a confluence base to achieve centralized distribution and collection of coolant, the system forms multiple parallel-flowing cooling sub-loops. This design solves the problem of flow distribution imbalance caused by process differences and uneven local resistance in traditional long-channel cooling systems. The flow rate, velocity, and pressure drop of the coolant are basically the same in each liquid cooling unit, so that each battery cell or battery cluster obtains nearly the same cooling intensity, thereby ensuring a highly uniform temperature distribution of the battery pack as a whole, effectively avoiding local overheating or overcooling, and improving the consistency, safety, and cycle life of the battery pack.

[0024] 2. The liquid cooling unit of the heat dissipation device disclosed in this invention has a composite contact layer composed of an elastic metal film and a flexible thermal pad at the interface in contact with the battery. This structure can dynamically adapt to the thickness expansion and contraction of the battery during charge and discharge cycles, and always maintain a tight fit at the interface, thereby suppressing the increase of contact thermal resistance. At the same time, the elastic deformation absorbs the mechanical stress caused by the change in battery volume, avoiding cumulative damage to the battery casing or cold plate structure, and significantly improving the structural reliability and thermal stability of the system during long-term operation.

[0025] 3. The liquid cooling unit of the heat dissipation device disclosed in this invention has a spindle-shaped or olive-shaped flow guide column in its inner cavity. The streamlined profile, which is constricted at both ends and convex in the middle, can guide the fluid to accelerate and decelerate smoothly, significantly reducing inlet eddies and dead zones, reducing flow resistance, and maintaining a uniform flow velocity distribution of the coolant in the battery contact area, thereby enhancing convective heat transfer. The mounting block located in the middle section of the flow guide column not only provides positioning support to prevent the flow guide column from vibrating and shifting, but also has liquid passage holes on it to perform secondary distribution and disturbance of the liquid flow, breaking the laminar boundary layer and enhancing the degree of turbulence, thereby further improving the heat transfer coefficient and achieving more efficient heat absorption.

[0026] 4. The heat dissipation device disclosed in this invention has a flow distribution base and a flow collection base arranged as independent components at both ends of the liquid cooling unit array, each with a dedicated flow distribution cavity and flow collection cavity inside. This separate architecture clearly separates the distribution logic and collection path of the coolant, which is beneficial to the simplification and optimization of the system piping layout. At the same time, the independent cavity structure facilitates the independent design and control of the inlet pressure, reduces mutual interference of fluids, ensures the balanced flow of each parallel branch, and improves the reliability and stability of the overall system pressure management.

[0027] 5. The mounting plate and connecting plate of the heat dissipation device disclosed in this invention are connected through the conical mating surfaces of the mounting sleeve and the connecting sleeve; the conical surface has self-centering and self-tightening sealing characteristics, generating radial clamping force during the tightening of fasteners to form a reliable seal that is resistant to high pressure and temperature cycling; at the same time, the conical guide simplifies the assembly alignment process and improves fault tolerance; the sleeve through-hole design combined with the inter-plate sealing gasket constitutes a multi-layer sealing system, ensuring that the coolant does not leak at the interface, and is particularly suitable for long-term vibration and thermal cycling conditions;

[0028] 6. The sealing gasket of the heat dissipation device disclosed in this invention, which is disposed between the mounting plate and the connecting plate, can be a discrete strip or block unit, with each unit corresponding to a row or local liquid cooling unit interface. This modular design not only facilitates local replacement and maintenance, reducing the need for disassembly of the entire system due to local damage, but also better compensates for local unevenness or deformation of the mounting surface, ensuring uniform sealing. For large battery packs, using multiple small sealing gaskets instead of integral gaskets reduces the difficulty of manufacturing, transportation and assembly, and improves the process feasibility and reliability of large-scale applications. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of a heat dissipation device for new energy batteries disclosed in this invention;

[0030] Figure 2 This is a partial exploded view of a specific embodiment of a heat dissipation device for new energy batteries disclosed in this invention;

[0031] Figure 3 This is a cross-sectional view of a liquid cooling unit in a specific embodiment of a heat dissipation device for new energy batteries disclosed in this invention.

[0032] Figure 4 This is a perspective view of the connecting plate of a specific embodiment of a heat dissipation device for new energy batteries disclosed in this invention.

[0033] In the picture,

[0034] 1. Liquid cooling unit; 11. Housing frame; 12. Elastic metal membrane; 13. Flow guide column; 14. Mounting block; 141. Liquid passage hole;

[0035] 2. Connecting base; 21. Diverter base; 22. Combiner base; 23. Mounting plate; 231. Battery hole; 232. Mounting hole; 233. Mounting sleeve; 2331. First liquid hole; 24. Connecting plate; 241. Connecting hole; 242. Connecting sleeve; 2421. Cavity hole; 25. Sealing gasket; 251. Second liquid hole; 26. Connecting pipe;

[0036] 3. Battery cells. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings.

[0038] Reference Figure 1-4 This invention discloses a heat dissipation device for new energy batteries, comprising multiple independent liquid cooling units 1, two connecting bases 2 respectively responsible for fluid distribution and collection (typically configured as a shunt base 21 and a collector base 22 used in pairs), and an interface component ensuring reliable connection and sealing between the liquid cooling units 1 and the connecting bases 2. Each liquid cooling unit 1 is designed as an independent heat dissipation module that can directly or indirectly contact the main heat-generating surfaces of one or a small cluster, such as 2-4 battery cells 3. This design decomposes the battery pack heat dissipation task into numerous parallel sub-units, solving the problem of uneven coolant flow distribution caused by excessively long flow channels and local resistance differences.

[0039] After the coolant is pumped from the external circulation system into the distribution base 21, it is evenly distributed to the inlet of each connected liquid cooling unit 1. The coolant then flows in parallel within the internal channels of each liquid cooling unit 1, absorbing the heat generated by the battery. Finally, all the heated coolant converges again at the confluence base 22 and returns to the external cooling system for heat exchange, thus forming a complete closed loop. This parallel flow design ensures that the coolant flowing through each battery cell 3 or battery cluster has nearly identical flow rate, velocity, and pressure drop, providing excellent temperature uniformity for the entire battery pack. This effectively avoids localized overheating or overcooling, greatly improving the consistency, safety, and cycle life of the battery pack.

[0040] As the core component that directly exchanges heat with the battery, the liquid cooling unit 1 includes a housing frame 11. An elastic metal film 12 is disposed at the interface between the housing frame 11 and the battery. This elastic metal film 12 is typically made of copper alloy, stainless steel, or other elastic metal materials with excellent thermal conductivity and fatigue strength. Its edges are joined to the housing frame 11 by sealing processes such as welding or brazing. The outer surface of the elastic metal film 12 is typically covered with a flexible thermally conductive pad. This thermally conductive pad can be made of silicone rubber filled with highly thermally conductive ceramic particles, phase change materials, or other highly flexible and thermally conductive composite materials. Its function is to further improve the adhesion of the contact interface, fill microscopic unevenness, and provide a certain degree of electrical insulation. The elastic metal film 12 and the flexible thermally conductive pad can dynamically adapt to changes in battery thickness to a certain extent. During battery charge-discharge cycles, lithium-ion insertion and extraction cause minute thickness expansion and contraction of individual battery cells 3. Traditional rigid cold plates are incompatible with such volume changes, and long-term action may generate accumulated mechanical stress, leading to battery casing deformation or fatigue failure of cold plate connectors. More seriously, the contact surface may separate due to expansion, forming air gaps, which drastically increases contact thermal resistance and drastically reduces heat dissipation efficiency. The elastic contact interface of this invention overcomes this defect. This adaptive capability ensures long-term stability and minimization of contact thermal resistance, while the elastic deformation itself absorbs mechanical stress, providing physical protection for the battery and significantly improving the structural reliability and thermal management stability of the entire battery pack.

[0041] At both ends of the liquid cooling unit 1, there are inlets and outlets for the coolant, which are used to connect with the connecting base 2. A flow guide column 13 structure is installed inside the cavity of the liquid cooling unit 1. The cross-sectional shape of the flow guide column 13 is designed as a streamlined shape, small at both ends and large in the middle, such as a spindle shape, an olive shape, or a special multi-segment curve fitting shape. This design is not arbitrary; its hydrodynamic significance lies in the following: when the coolant enters the cavity from the inlet, the contracting shape at the front end of the flow guide column 13 guides the fluid to accelerate smoothly towards the center, avoiding the generation of violent eddies and dead zones at the inlet; after the fluid passes through the maximum diameter of the flow guide column 13, the contracting shape at its rear end guides the fluid to decelerate smoothly and diffuse towards the outlet. This helps maintain a stable flow field, reduces flow resistance, and allows for a more uniform flow velocity distribution of the coolant when flowing through the battery contact area, thereby optimizing the convective heat transfer effect.

[0042] Furthermore, a mounting block 14 is provided at the middle position of the guide column 13. The outer contour of the mounting block 14 fits tightly against the inner wall of the liquid cooling unit 1 at this location, serving to position and support the guide column 13, preventing it from vibrating or shifting under fluid impact. The mounting block 14 is not a solid enclosure, but rather has several liquid passage holes 141. These liquid passage holes 141 first ensure that the coolant can smoothly pass through the mounting block 14 and continue flowing to the outlet; secondly, they can secondary distribute and disturb the liquid flow passing through this location, breaking up any possible laminar boundary layer, enhancing the turbulence effect, and further improving the heat transfer coefficient. The mounting block 14 can be integrally formed with the guide column 13, or it can be fixed by subsequent assembly. The material selection must consider the compatibility with the coolant and the structural integrity under long-term immersion.

[0043] In a preferred embodiment of the invention, the connecting base 2 is configured as two sets of independent but structurally symmetrical or similar components: one set is a flow-diverting base 21, and the other set is a flow-combining base 22. The flow-diverting base 21 and the flow-combining base 22 are respectively arranged at both ends of the array of all liquid cooling units 1. The flow-diverting base 21 has one or more flow-diverting chambers inside, which receive coolant from the main inlet pipe and distribute it evenly to the interface connected to the inlet of each liquid cooling unit 1. The flow-combining base 22 has one or more flow-combining chambers inside, which collect the heated coolant flowing out from the outlet of all liquid cooling units 1 and converge it into the main outlet pipe. This separate design makes the fluid distribution and collection logic clear, facilitating pipeline layout and pressure management.

[0044] The connection base 2 typically comprises two main parts: a mounting plate 23 for mechanically fixing to the battery module or battery pack housing, and a connecting plate 24 with internal cavities. The mounting plate 23 has several battery holes 231, the size, shape, and arrangement of which precisely match the size of the individual battery cells 3 or battery clusters to be cooled, ensuring accurate alignment of the liquid cooling unit 1. Simultaneously, the mounting plate 23 also has several mounting holes 232, the number of which matches the number of liquid cooling units 1, and their positions are adjacent to or staggered with the battery holes 231. An mounting sleeve 233 is pressed into each mounting hole 232 using an interference fit. The mounting sleeve 233 is typically made of a corrosion-resistant metal with relatively poor thermal conductivity or a high-strength engineering plastic, and its main function is to act as a mechanical connection conduit and a first-stage sealing carrier between the liquid cooling unit 1 and the connection base 2. The mounting sleeve 233 penetrates the mounting hole 232, and its outer wall is tightly fitted or sealed to the inner wall of the inlet / outlet pipe section of the liquid cooling unit 1. The two ends of the mounting sleeve 233 are open, forming a first liquid hole 2331 that allows coolant to pass through.

[0045] The connecting plate 24 is used to realize the function of fluid distribution or collection. Its interior is formed with flow channels of diversion cavity or confluence cavity through machining or casting. In the illustrated embodiment, one end of the connecting plate 24 has multiple connecting pipes 26 extending and distributed in an array. The connecting pipes 26 serve as channels for the inflow or outflow of coolant and are connected to the internal cavity of the connecting plate 24.

[0046] On the surface of the connecting plate 24, a connecting hole 241 is provided corresponding to the position of each mounting sleeve 233. A connecting sleeve 242 is also pressed into each connecting hole 241 using an interference fit. The material selection for the connecting sleeve 242 needs to consider sealing performance, wear resistance, and compatibility with coolant; copper alloy, stainless steel, or surface-treated aluminum alloy are commonly used. One end of the connecting sleeve 242 is open, and the other end can be closed or connected to a special internal cavity structure according to design requirements. The contact surfaces of the connecting sleeve 242 and the mounting sleeve 233 are designed as conical surfaces. For example, the outer wall of the connecting sleeve 242 can be machined into an outer conical surface, while the corresponding inner wall of the mounting sleeve 233 can be machined into an inner conical surface. The tapered mating surfaces possess superior self-centering and self-tightening sealing properties: when the connecting plate 24 and the mounting plate 23 are tightened by bolts or other fasteners, the relative sliding between the tapered surfaces generates radial clamping force, forcing the connecting sleeve 242 and the mounting sleeve 233 to fit tightly together, forming an elastic deformation seal that can withstand high system pressure and temperature cycles. Simultaneously, the tapered guide also makes the assembly process easier and more forgiving. A cavity 2421 is provided in the middle or root of the connecting sleeve 242, which connects the internal channel of the connecting sleeve 242 to the cavity inside the connecting plate 24. The coolant flows from the distribution chamber of the distribution base 21, through the cavity 2421 of the connecting sleeve 242, into the connecting sleeve 242, then through the conical mating surface into the first liquid hole 2331 of the mounting sleeve 233, and finally into the liquid cooling unit 1; the coolant flowing out of the liquid cooling unit 1 flows in the opposite direction through the mounting sleeve 233, the conical mating surface, the connecting sleeve 242 and its cavity 2421, and finally merges into the confluence chamber of the confluence base 22.

[0047] To ensure absolute sealing reliability of the entire interface under long-term vibration and thermal cycling, at least one sealing gasket 25 is provided between the mounting plate 23 and the connecting plate 24. The sealing gasket 25 is typically made of an elastomer material that is resistant to high temperatures and coolant corrosion, and has good compression resilience, such as hydrogenated nitrile rubber, fluororubber, or silicone rubber. Several second liquid holes 251 are precisely formed on the sealing gasket 25, and the number and position of these second liquid holes 251 correspond one-to-one with and are strictly aligned with the first liquid holes 2331. During assembly, each connecting sleeve 242 needs to pass through a corresponding second liquid hole 251. The function of the sealing gasket 25 is to provide auxiliary planar sealing: when the mounting plate 23 and the connecting plate 24 are pressed together by fasteners, the sealing gasket 25 is compressed, and its material flows under pressure and fills the microscopic unevenness of the mating surfaces of the mounting plate 23 and the connecting plate 24, forming a barrier to prevent coolant leakage from the gap between the plates. Meanwhile, the connecting sleeve 242, passing through the second liquid hole 251, also positions the sealing gasket 25 at that location and prevents it from being squeezed out. To further adapt to different battery pack layouts and liquid cooling unit 1 arrangement densities, the sealing gasket 25 can be designed as multiple independent strip or block units, rather than a single large gasket. For example, each row of liquid cooling units 1 corresponds to an independent sealing gasket 25 strip, and each sealing gasket 25 strip has one or two rows of second liquid holes 251. The advantages of this modular sealing gasket 25 design are: firstly, installation and replacement are more flexible and convenient; local damage only requires replacement of the corresponding sealing gasket 25, without disassembling the entire system; secondly, it can better adapt to possible local unevenness or minor deformation between the mounting plate 23 and the connecting plate 24; finally, for large battery packs, using multiple small sealing gaskets 25 can reduce the difficulties and damage risks of a single large sealing gasket 25 during manufacturing, transportation, and installation.

[0048] The working process and principle of this embodiment are as follows: First, the coolant is pumped from the external circulation pump into the distribution base 21, where it is evenly distributed to each outlet within the internal distribution chamber. Each outlet is connected to the inlet of a liquid cooling unit 1 via a mounting sleeve 233, a connecting sleeve 242, and a sealing gasket 25. The coolant then flows simultaneously and in parallel into all liquid cooling units 1. Simultaneously, the independent design of the distribution base 21 and the confluence base 22 physically separates the distribution and confluence functions, resulting in a clear fluid path logic. The parallel flow channel design of multiple independent liquid cooling units 1 completely avoids the flow unevenness problem caused by process differences in traditional long serpentine flow channels, ensuring basic consistency in flow rate and pressure drop for each heat dissipation branch from the system source, laying a fluid dynamics foundation for achieving overall temperature uniformity of the battery pack.

[0049] After entering the liquid cooling unit 1, the coolant flows along the flow channel formed by the streamlined guide column 13 and the mounting block 14. During the flow, the coolant absorbs the battery heat transferred through the elastic metal film 12 and the flexible thermal pad. The minute thickness changes of the battery during operation are dynamically absorbed by this elastic contact interface. The streamlined design of the guide column 13 optimizes the flow field, reduces eddies and dead zones, and makes the flow velocity distribution more uniform; the liquid passage holes 141 on the mounting block 14 provide secondary disturbance to the fluid, enhancing turbulence, and the two work together to improve the heat transfer coefficient.

[0050] The composite interface formed by the elastic metal film 12 and the flexible thermal pad remains firmly attached to the battery surface under the action of clamping force. When the battery expands, the interface elastically deforms to maintain the fit; when it contracts, the flexible material rebounds to prevent gaps from forming. This ensures the long-term stability and minimization of contact thermal resistance, while the elastic deformation absorbs mechanical stress, protecting the battery and the heat dissipation structure.

[0051] After absorbing heat and heating up, the coolant flows out from the outlet of each liquid cooling unit 1, and flows back into the manifold of the manifold base 22 through the interface assembly. After converging here, it returns to the external cooling system to complete heat exchange, forming a closed loop. Throughout the flow path, especially at the interface connecting the base 2 and the liquid cooling unit 1, the system pressure is maintained by a multi-layer sealing structure.

[0052] The tapered mating surfaces between the mounting sleeve 233 and the connecting sleeve 242 generate radial self-tightening force when the bolts are tightened, forming an elastomeric seal that can withstand high pressure and thermal cycling. The sealing gasket 25 between the mounting plate 23 and the connecting plate 24 is compressed and fills the microscopic unevenness of the mating surface, forming a second planar seal to prevent side leakage between the plates.

[0053] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A heat dissipation device for new energy batteries, characterized in that: include; Multiple independent liquid cooling units (1), each of the liquid cooling units (1) being used to contact the surface of one or a small cluster of battery cells (3); Two connecting bases (2), one of which is provided with a flow-dividing cavity, and the other of which is provided with a flow-combining cavity; The coolant inlet and outlet of each liquid cooling unit (1) are detachably and sealed to the connecting base (2), so that the coolant from the diversion cavity can flow in parallel through all the liquid cooling units (1) and then merge into the confluence cavity.

2. The heat dissipation device for a new energy battery according to claim 1, characterized in that: The interface between the liquid cooling unit (1) and the battery includes an elastic metal film (12), the inner cavity of which forms part of the coolant flow channel, and the outer surface of which is covered with a flexible thermal pad.

3. A heat dissipation device for a new energy battery according to claim 2, characterized in that: The liquid cooling unit (1) has an inlet and an outlet for the coolant at both ends. A guide column (13) is provided inside the liquid cooling unit (1). The cross-section of the guide column (13) is smaller at both ends and larger in the middle.

4. A heat dissipation device for a new energy battery according to claim 3, characterized in that: A mounting block (14) is provided in the middle of the flow guide column (13). The mounting block (14) is in contact with the inner wall of the inner cavity of the liquid cooling unit (1). A plurality of liquid passage holes (141) are opened on the mounting block (14).

5. A heat dissipation device for a new energy battery according to claim 1, characterized in that: The connecting base (2) is configured in two sets, one set being a branch base (21) and the other set being a converging base (22); The diversion base (21) and the confluence base (22) are located at both ends of the liquid cooling unit (1). The coolant is diverted from the diversion base (21) to each of the liquid cooling units (1), and the confluence base (22) gathers the coolant that has passed through the liquid cooling unit (1).

6. A heat dissipation device for a new energy battery according to claim 1, characterized in that: The connecting base (2) includes a mounting plate (23) that fits into the battery cell (3) and a connecting plate (24) with an internal cavity. The mounting plate (23) has a plurality of battery holes (231) that mate with the battery cells (3). The mounting plate (23) also has a plurality of mounting holes (232) that mate with the liquid cooling unit (1). Each mounting hole (232) is fitted with a mounting sleeve (233). The mounting sleeve (233) passes through the mounting hole (232) and fits against the inner wall of the liquid cooling unit (1). The two ends of the mounting sleeve (233) are connected to form a first liquid hole (2331).

7. A heat dissipation device for a new energy battery according to claim 6, characterized in that: The connecting plate (24) is provided with a plurality of connecting holes (241), and a connecting sleeve (242) is interference-fitted in each connecting hole (241). The connecting sleeve (242) passes through the connecting hole (241) and fits against the inner wall of the mounting sleeve (233). The end of the connecting sleeve (242) facing the mounting sleeve (233) is open, and the contact surface between the connecting sleeve (242) and the mounting sleeve (233) is a conical surface.

8. A heat dissipation device for a new energy battery according to claim 7, characterized in that: The connecting sleeve (242) has a cavity (2421) in the middle, and the cavity (2421) is connected to the cavity of the connecting plate (24).

9. A heat dissipation device for a new energy battery according to claim 7, characterized in that: A sealing gasket (25) is provided between the mounting plate (23) and the connecting plate (24). The sealing gasket (25) has a plurality of second liquid holes (251). The second liquid holes (251) correspond one-to-one with the first liquid holes (2331). Each connecting sleeve (242) passes through one of the second liquid holes (251).

10. A heat dissipation device for a new energy battery according to claim 9, characterized in that: The sealing gasket (25) is provided in multiple ways, and each sealing gasket (25) is provided with one or two rows of the second liquid holes (251).

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