Multi-faceted high efficiency cooling system for power batteries

Abstract

The application belongs to the technical field of power batteries, and particularly relates to a multi-surface efficient cooling system for a power battery, which comprises at least one group of battery monomers, at least two S-shaped cooling plates, and a frame type cladding structure, wherein the S-shaped cooling plates are integrally formed by extrusion of aluminum alloy profiles, and are provided with continuous and through S-shaped meandering flow channels inside, the outer side of the battery monomers is symmetrically provided with two S-shaped cooling plates, and the two S-shaped cooling plates are cooperatively enclosed, a plurality of stacked battery modules are formed by alternately stacking and assembling the battery monomers and the S-shaped cooling plates, and the cooling liquid flow directions of adjacent S-shaped cooling plates are opposite. Compared with a traditional double-surface cooling structure, the application effectively increases the heat dissipation area by about 6 times, can quickly dredge a large amount of heat instantaneously gathered in the battery under an ultra-fast charging condition, inhibits the problems of too fast temperature rise and local over-temperature of the battery, and reduces the risks of fast charging lithium precipitation and thermal runaway from the root, and perfectly adapts to a high-voltage platform high-power fast charging scene.

Description

Technical Field

[0001] This invention belongs to the field of power battery technology, specifically relating to a multi-faceted high-efficiency cooling system for power batteries. Background Technology

[0002] As the new energy vehicle industry continues to iterate towards high-rate fast charging, and ultra-fast charging technology is gradually being applied on a large scale, the heat generation rate of power batteries under 3C~6C fast charging conditions is increasing exponentially. This places higher demands on the rapid heat dissipation and overall temperature uniformity capabilities of the battery thermal management system. During high-rate fast charging, the high current operation of the battery generates extremely high heat density in a short period of time. If heat dissipation is not timely or the heat dissipation coverage is incomplete, it can easily lead to problems such as localized high temperatures, lithium plating, uncontrolled thermal runaway, and severe degradation of battery cycle life. This has become a core bottleneck restricting the safety and lifespan of ultra-fast charging power batteries.

[0003] To address these challenges, liquid cooling technology for power batteries has evolved from single-sided bottom cooling to multi-sided cooling. Currently, various technical solutions for liquid cooling of power batteries have been proposed, but all have inherent defects to varying degrees, making them difficult to adapt to the high heat load conditions of ultra-fast charging.

[0004] Traditional liquid cooling solutions for power batteries mostly employ a bottom-mounted flat cooling plate structure, which can only achieve single-sided heat dissipation at the bottom or top of the cell. This type of solution cannot cover the core heat-generating areas such as the large surface area of ​​the cell. Under the high heat load of high-rate fast charging, a large amount of heat accumulates on the vertical surface of the cell, resulting in prominent local overheating problems, which is difficult to meet the heat dissipation requirements of ultra-fast charging scenarios.

[0005] Patent application CN117673565A proposes a battery liquid cooling structure that achieves four-sided cooling of the battery pack by using a base plate to cool the bottom surface, side plates to cool two sides, and end plates to cool the remaining two sides. While this solution achieves multi-sided cooling coverage, it employs a modular, spliced ​​structure. The base plate, side plates, and end plates are each separately set up and then enclosed to form an installation area, resulting in numerous splicing gaps and poor overall pressure resistance. Under ultra-fast charging liquid cooling conditions with high flow rates and high expansion forces, leakage and deformation are prone to occur at the splicing points, leading to insufficient structural reliability. Furthermore, this solution does not address the temperature uniformity design between the stacked module layers. Each cold plate uses a uniform liquid cooling circulation method, which fails to solve the problem of excessive temperature differences between layers and between the front and rear ends after module stacking.

[0006] Conventional facade cooling solutions often employ 3-series aluminum alloy harmonica tube cooling plates. For example, patent CN218385396U proposes a battery liquid cooling plate structure with an S-shaped flow channel, which uses 3-series aluminum alloy harmonica tubes bent into shape. 3-series aluminum has low strength and poor pressure resistance, and the harmonica tube has a porous, thin-walled extruded structure, resulting in poor flow channel uniformity and high thermal resistance. Under high-flow-rate fast-charging liquid cooling conditions, it is prone to deformation and bulging. If a multi-faceted liquid cooling structure is required, special tooling fixtures are needed for bending and forming. The structural dimensions and shape are greatly limited by the tooling molds, and stress concentration is prone to occur at the bending position, leading to structural defects such as cracking and leakage.

[0007] Patent CN212695218U proposes a liquid cooling module for blade-shaped power batteries, employing an integrated frame-type liquid cooling plate structure formed from extruded aluminum harmonica-shaped tubes. The frame-type liquid cooling plate has an S-shaped flow channel cavity for heat exchange with the entire surface of the battery cells. This solution achieves an integrated frame structure through extrusion molding, but it is designed for the specific shape of blade batteries and differs from the application scenarios of standardized stacked modules with square cells. Patent CN222546467U proposes a battery pack in which a first liquid cooling plate is sandwiched between adjacent cell groups, and a second liquid cooling plate is located on the bottom side of the cell group. The first and second liquid cooling plates are integrally extruded, achieving cooling of at least three sides of the cell group. However, in this solution, the liquid cooling plate sandwiched between the cell groups and the bottom liquid cooling plate are different components; it does not achieve complete four-sided coverage of a single cell, nor does it address the staggered convection temperature equalization structure between the stacked module layers.

[0008] Regarding the issue of uniform temperature distribution in coolant flow, patent CN111540982A proposes a bidirectional flow channel battery cooling plate. Two S-shaped flow channels are arranged in parallel on the surface of the cooling plate, with the liquid cooling medium flowing in opposite directions. This solution uses reverse flow channels within the same cooling plate to improve the temperature uniformity of the single plate, but the cooling plate is only installed on both sides of the power battery module, failing to cover the entire core heat-generating surface of the cell. Patent CN111490313B proposes a counter-flow cooling system for power battery packs. It sets two sets of staggered cooling channels within each cooling unit, with the cooling medium flowing in opposite directions to form counter-flow. This counter-flow is also achieved within the cooling unit, rather than through reverse convection between adjacent cold plates between module stacks to achieve uniform temperature distribution across the entire area.

[0009] In summary, existing liquid cooling technologies for power batteries have significant shortcomings in three aspects: heat dissipation coverage, module temperature uniformity, and structural reliability. First, the heat dissipation surface coverage is incomplete; single-sided cooling solutions at the bottom cannot reach the core heat-generating area on the cell's vertical surface, while some multi-sided cooling solutions, which use a split-type splicing structure, pose reliability risks. Second, existing solutions have not effectively addressed the temperature difference between layers and between the front and rear ends of the stacked modules. Long-term operation with temperature differences will lead to degradation of cell consistency and shorten the cycle life of fast-charging batteries. Third, structural forms such as split splicing and harmonica-tube bending are difficult to guarantee long-term reliable operation under high flow and high expansion force conditions. Summary of the Invention

[0010] The purpose of this invention is to provide a multi-faceted high-efficiency cooling system for power batteries, which can achieve full coverage liquid cooling of all core heat-generating surfaces of the battery cell, has the ability to achieve staggered convection temperature uniformity at the module level, and has reliable structural strength.

[0011] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a multi-faceted high-efficiency cooling system for power batteries, comprising: At least one set of individual battery cells; At least two S-shaped cold plates, wherein the S-shaped cold plates are integrally formed by extrusion of aluminum alloy profiles, and have a continuous S-shaped meandering flow channel inside. The S-shaped cold plates have a frame-type covering structure, and a single S-shaped cold plate can simultaneously adhere to the adjacent sidewalls and end faces of the battery cell. Two S-shaped cold plates are symmetrically assembled on the outside of the battery cell. The two S-shaped cold plates cooperate with each other to completely cover the front, back, left and right sides of the battery cell, forming a liquid-cooled heat exchange structure with full coverage on all four sides. Multiple stacked battery modules are formed by alternating stacking of the battery cells and the S-shaped cold plates. The coolant flows in opposite directions on adjacent S-shaped cold plates, forming an interlayer staggered convection temperature equalization structure.

[0012] This invention uses two integrally formed S-shaped cold plates to surround the front, back, left, and right sides of the battery cell, ensuring that all core heat-generating working surfaces are covered by liquid cooling. This eliminates the heat dissipation blind spots on the front and back sides of the battery cell in traditional solutions, and the effective heat dissipation area is increased by about 6 times compared to the traditional double-sided cooling structure. At the same time, the adjacent cold plates adopt reverse flow direction, with the low-temperature liquid inlet end of one cold plate corresponding to the high-temperature liquid outlet end of the adjacent cold plate. Heat complementarity is achieved through heat conduction between adjacent battery cells, effectively offsetting the temperature gradient generated by a single flow direction, and keeping the maximum temperature difference of the battery cells in the module within 3°C.

[0013] Preferably, the S-shaped cold plate is integrally formed by extrusion process of 6-series aluminum alloy profile, and the overall plate body has no stamping, welding, or splicing structure. The S-shaped meandering flow channel is a meandering design with equal width.

[0014] It is made of 6-series aluminum alloy profiles through one-piece extrusion molding, with no weld seams, which eliminates the risk of weld leakage from traditional stamping and welding or split cold plate splicing. 6-series aluminum alloy has high strength and good pressure resistance, and can withstand the expansion force of the battery cell and the impact of high-pressure liquid cooling cycle, which greatly improves the structural reliability. At the same time, the process flow is short and no secondary processing is required, making it suitable for mass production.

[0015] Preferably, the internal cavity of the S-shaped cold plate adopts a gradually changing trapezoidal cross-section with a wide inlet, a narrow middle section, and an expanded outlet. The cross-sectional area of ​​the high-heat zone flow channel of the S-shaped cold plate is larger than the cross-sectional area of ​​the core zone flow channel.

[0016] The increased flow rate of the coolant in the narrow section enhances the heat exchange efficiency in the high-heat zone of the tab, while the widened outlet reduces flow resistance and balances the flow rate at the beginning and end of the cold plate. Combined with the differentiated liquid distribution design between the tab area and the core area, the temperature difference between the inlet and outlet of a single cold plate is reduced from 3℃~4℃ to less than 1℃. This enhances the heat dissipation effect without increasing the pump power and solves the defects of the traditional S-shaped flow channel, such as the coolant temperature rise and heat exchange attenuation in the latter half.

[0017] Preferably, in the stacked battery module, the S-shaped cold plates of odd-numbered layers adopt a coolant flow direction of left in and right out, the S-shaped cold plates of even-numbered layers adopt a coolant flow direction of right in and left out, and the coolant flow direction of adjacent S-shaped cold plates is opposite.

[0018] By precisely arranging the odd and even layers in opposite directions, a heat exchange layout with alternating left and right convection is formed inside the module. The low-temperature liquid inlet end of the cold plate and the high-temperature liquid outlet end of the adjacent layer are spatially arranged in correspondence. Heat complementarity is achieved through heat conduction between adjacent cells, which completely offsets the temperature gradient at the beginning and end of the module and between layers caused by the continuous heating of the coolant in the traditional single-flow scheme.

[0019] Preferably, it also includes staggered convection liquid cooling pipelines and inlet / outlet integrated interfaces. The fluid ports of each of the S-shaped cold plates are connected in parallel through the staggered convection liquid cooling pipelines. The staggered convection liquid cooling pipelines are uniformly connected to the inlet / outlet integrated interfaces, which are used to connect to the system's main liquid cooling circulation loop.

[0020] By using a parallel connection structure in conjunction with the internal flow distribution of the inlet and outlet liquid integrated interface, the flow rate and pressure of the coolant in each layer of the cold plate can be precisely guaranteed to be uniform, providing stable fluid circulation conditions for uniform heat dissipation throughout the module and avoiding the problem of insufficient local heat dissipation caused by uneven flow in each layer.

[0021] Preferably, the end of the S-shaped cold plate is provided with a standard fluid interface, which is plugged into the staggered convection liquid cooling pipeline through a sealed joint.

[0022] The plug-in connection method is easy to assemble, facilitates the individual disassembly and maintenance of the cold plate, has high sealing reliability, and effectively reduces assembly and maintenance costs.

[0023] Preferably, a highly thermally conductive insulating silicone pad is provided between the S-shaped cold plate and the bonding surface of the battery cell.

[0024] The high thermal conductivity insulating silicone pad fills the tiny gap between the cold plate and the battery cell bonding surface, reducing the interfacial contact thermal resistance and ensuring the rapid heat conduction effect under high-rate fast charging. At the same time, it achieves insulation protection between the battery cell and the cold plate, improving the safety and reliability of the system.

[0025] Preferably, it also includes a system enclosure, in which the stacked battery modules and the S-shaped cold plate are integrated and installed inside the system enclosure, which serves to provide overall protection for the internal structure.

[0026] The system enclosure provides overall protection for the internal modules, liquid cooling pipelines, and cold plate structure. It features positioning and fixation, dust and water protection, and vibration resistance, making it suitable for complex vehicle vibration and high and low temperature conditions, ensuring the long-term stable operation of the entire cooling system.

[0027] Preferably, the S-shaped meandering channel is any one of a segmented symmetrical S-shaped channel, a wave-shaped continuous channel, or a single-bend Z-shaped channel.

[0028] All of the above-mentioned flow channel configurations can ensure stable circulation of coolant inside the cold plate. Under the premise of achieving full-area heat dissipation on all four sides of the cell, it can be adapted to battery modules with different flow rates and different heat exchange requirements, further expanding the scope of application of the present invention.

[0029] Preferably, the stacked battery module is divided into multiple units, with the coolant flowing in opposite directions to the adjacent S-shaped cold plates within each unit, and the units are connected in parallel for coolant supply.

[0030] For battery modules with multiple layers, the grouped staggered convection method can shorten the length of a single flow path, reduce the overall pressure drop of the flow path, and allow each unit to independently adjust the flow rate to adapt to the differentiated heat dissipation requirements of different areas of the module. At the same time, when a group of units fails, other groups of units can still work normally, improving the redundancy and reliability of the system.

[0031] The beneficial effects of this invention are as follows: This invention abandons the traditional bottom single-sided or partial double-sided cooling heat dissipation method. It uses two S-shaped cold plates, extruded from two profiles and integrally formed, to completely enclose the four sides of the battery cell (front, back, left, and right), eliminating heat dissipation blind spots on the front and back sides. This ensures that all core heat-generating working surfaces of the battery cell are effectively liquid-cooled, effectively increasing the heat dissipation area by approximately 6 times compared to traditional double-sided cooling structures. This allows for rapid dissipation of the large amount of heat instantly accumulated in the battery cell during ultra-fast charging, suppressing excessively rapid temperature rise and local overheating issues. It fundamentally reduces the risk of lithium plating and thermal runaway during fast charging, perfectly adapting to high-power fast charging scenarios on high-voltage platforms. Simultaneously, the stacked adjacent cold plates are arranged in an odd-even layer with opposite left-right flow directions. The low-temperature inlet of one cold plate corresponds to the high-temperature outlet of the adjacent cold plate, achieving heat complementarity through heat conduction between adjacent battery cells, effectively resisting heat loss. The design eliminates the temperature gradient between the front and rear ends and between layers caused by the continuous heating of the coolant in traditional single-flow cold plates. This keeps the maximum temperature difference between cells within the module below 3°C, significantly improving the overall temperature uniformity of the battery module. This avoids capacity decay and consistency degradation caused by long-term temperature difference operation of cells, and significantly extends the cycle life of fast-charging batteries. In addition, the cold plate is integrally formed using a 6-series aluminum alloy profile extrusion process. The plate body has no stamping, welding, or splicing structure, and there are no weld seams on the large expansion stress side of the cell. The 6-series aluminum alloy itself has high strength and good pressure resistance. Combined with the flexible adjustment of internal reinforcing ribs, it not only completely eliminates the risk of weld leakage and cold plate cracking caused by cell expansion force, but also adapts to the stress and flow distribution requirements of different sized cell structures. The structure is compact and highly integrated, compatible with the power battery assembly requirements of multiple scenarios such as passenger cars and energy storage, and has outstanding versatility and industrial application value. Attached Figure Description

[0032] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the S-shaped cold plate in this invention; Figure 3 This is a schematic diagram of the internal structure of the S-shaped cold plate in this invention; Figure 4 This is a partial enlarged view of the present invention; In the diagram: 1. S-shaped cold plate; 2. Single battery cell; 3. Stacked battery module; 4. Interleaved convection liquid cooling pipeline; 5. Inlet / outlet liquid integrated interface; 6. System enclosure. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. The following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Any modifications, equivalent substitutions, or improvements made based on the concept of this invention are within the scope of protection of this invention.

[0034] like Figure 1As shown, the present invention provides a multi-faceted high-efficiency cooling system for power batteries, comprising at least one set of battery cells 2 and at least two S-shaped cold plates 1. The S-shaped cold plates 1 are integrally formed using an aluminum alloy profile extrusion process, and have continuously connected S-shaped meandering flow channels inside. The S-shaped cold plates 1 have a frame-type covering structure, and a single cold plate can simultaneously adhere to adjacent sidewalls and end faces of the battery cells 2.

[0035] In a preferred embodiment, the S-shaped cold plate 1 is integrally formed using a 6-series aluminum alloy profile extrusion process. Specifically, the 6-series aluminum alloy billet is heated to 450℃~500℃ and extruded in one pass through an extruder to obtain a single integral plate. The integral plate has no stamping, welding, or splicing structures. The internal S-shaped meandering channels are designed with equal widths, ranging from 8mm to 12mm, with a channel spacing of 6mm to 10mm. After extrusion, the cold plate is machined and trimmed according to the cell dimensions to ensure precise matching between the covering and bonding surface and the end faces and sidewall dimensions of the square cell. After forming, the cold plate undergoes an insulating spray coating treatment.

[0036] like Figure 2 As shown, during assembly, two S-shaped cold plates 1 are symmetrically assembled on the outside of the battery cell 2. The two S-shaped cold plates 1 cooperate to completely enclose the four sides (front, back, left, and right) of the battery cell 2, forming a four-sided fully covered liquid-cooled heat exchange structure. Specifically, the covering surface of the left cold plate is attached to the left side wall and part of the front end face of the battery cell, and the covering surface of the right cold plate is attached to the right side wall and part of the rear end face of the battery cell. After the two cold plates are enclosed, they completely cover the four sides (front, back, left, and right) of the battery cell. A high thermal conductivity insulating silicone pad with a thickness of 0.5mm-1.5mm is placed between the contact surfaces of the S-shaped cold plate 1 and the battery cell 2. The silicone pad is used to fill the tiny gaps between the contact surfaces of the cold plate and the battery cell, reduce the interfacial contact thermal resistance, and at the same time achieve insulation protection between the battery cell and the cold plate. The two cold plates are fixed relative to each other by clamps or bolt assemblies.

[0037] As a preferred embodiment, such as Figure 3 As shown, the internal cavity of the S-shaped cold plate 1 adopts a gradually changing trapezoidal cross-section with a wide inlet, a narrower middle section, and an expanded outlet. The inlet width of the flow channel is 10mm-14mm, the middle section narrows to 6mm-8mm, and the outlet diameter expands to 10mm-14mm. The coolant flow velocity increases in the narrowed section, enhancing the heat exchange efficiency in this area. Simultaneously, the cross-sectional area of ​​the flow channel corresponding to the high-heat zone of the S-shaped cold plate 1 is larger than that of the corresponding core zone, allowing for a higher coolant flow rate in the high-heat zone of the tab, achieving differentiated coolant distribution. The expanded outlet diameter reduces flow resistance and balances the flow rate at the beginning and end of the cold plate. After adopting this gradually changing cross-section flow channel, the temperature difference between the inlet and outlet ends of a single cold plate is reduced from 3℃-4℃ to less than 1℃.

[0038] Multiple battery modules 3 are formed by alternately stacking and assembling individual battery cells 2 with S-shaped cold plates 1. The coolant flows in opposite directions to adjacent S-shaped cold plates 1, creating an interlayer staggered convection temperature equalization structure. Specifically, the odd-numbered S-shaped cold plates 1 (layers 1, 3, 5, etc.) use a left-in, right-out coolant flow direction, while the even-numbered S-shaped cold plates 1 (layers 2, 4, 6, etc.) use a right-in, left-out coolant flow direction, and the coolant flows in opposite directions to adjacent cold plates. The low-temperature inlet end of one cold plate corresponds to the high-temperature outlet end of the adjacent cold plate, and the two complement each other through heat conduction from adjacent battery cells, effectively offsetting the temperature gradient caused by heat exchange in a single flow direction. After stacking, the module is pressed together by end plates and tie rods to ensure tight adhesion between each layer of battery cells and cold plates. With this staggered convection structure, the maximum temperature difference between the battery cells in the module can be controlled within 3°C.

[0039] like Figure 4 As shown, the system also includes staggered convection liquid cooling pipelines 4 and integrated inlet / outlet interfaces 5. The fluid ports of each S-shaped cold plate 1 are connected in parallel through the staggered convection liquid cooling pipelines 4, which are uniformly connected to the integrated inlet / outlet interfaces 5. The integrated inlet / outlet interfaces 5 are used to connect to the system's main liquid cooling circulation loop. The integrated inlet / outlet interfaces 5 have an internal flow distribution structure to ensure uniform flow and pressure of the coolant in each layer of cold plates. The pipelines adopt a pressure-resistant sealing structure. A standard fluid interface is pre-installed at the end of each S-shaped cold plate 1. This standard fluid interface is plugged into the staggered convection liquid cooling pipelines 4 via a sealed connector, facilitating individual disassembly and maintenance of the cold plate.

[0040] The system also includes a system enclosure 6, with the stacked battery modules 3 and S-shaped cold plate 1 integrated inside the system enclosure 6. The system enclosure 6 is made of high-strength aluminum alloy or steel to provide overall protection for the internal structure and is suitable for complex vehicle vibration and high and low temperature conditions.

[0041] During the overall operation, the heat generated by the individual battery cells 2 during charging and discharging is rapidly conducted to the S-shaped cold plate 1 through the four mating surfaces (front, back, left, and right). Coolant enters the staggered convection cooling pipes 4 via the integrated inlet / outlet interface 5, and is distributed to each layer of the S-shaped cold plate. It circulates continuously and smoothly within the integrally formed S-shaped meandering flow channel, carrying away the heat accumulated in the cells from all directions. Simultaneously, adjacent cold plates inside the stacked battery module 3 adopt an odd-even layer reverse staggered convection layout, ensuring that the temperature of all cells in the front, back, upper, and lower layers of the module tends to be uniform, achieving uniform temperature dissipation throughout the entire power battery module.

[0042] In other alternative implementations, the S-shaped meandering flow channel can be replaced by any one of the following: a segmented symmetrical S-shaped flow channel, a wavy continuous flow channel, or a single-bend Z-shaped flow channel. The segmented symmetrical S-shaped flow channel consists of multiple S-shaped segments connected end-to-end, with the bending direction of each segment alternating; the wavy continuous flow channel extends in a wavy shape, with alternating peaks and troughs, and no sharp bends; the single-bend Z-shaped flow channel has only one bend, forming an overall Z-shape. All of these flow channel configurations can ensure stable circulation of coolant within the cold plate, achieving full-area heat dissipation on all four sides of the battery cell.

[0043] For battery modules with multiple layers, the stacked battery module 3 can be further divided into multiple units. Each unit contains several layers of cells and cold plates. The coolant flows in opposite directions to the adjacent S-shaped cold plates 1 within the unit. The units are supplied with coolant in parallel and independently. This method can shorten the length of a single flow path, reduce the overall pressure drop of the flow path, and allow each unit to independently adjust the flow rate to adapt to the differentiated heat dissipation needs of different areas of the module.

[0044] For those skilled in the art, various improvements and modifications can be made without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A multi-faceted high-efficiency cooling system for power batteries, characterized in that, include: At least one set of individual battery cells (2); At least two S-shaped cold plates (1), the S-shaped cold plates (1) are integrally formed by extrusion of aluminum alloy profiles, and have a continuous through S-shaped meandering flow channel inside. The S-shaped cold plates (1) have a frame-type covering structure. A single S-shaped cold plate (1) can simultaneously adhere to the adjacent sidewalls and end faces of the battery cell (2). Two S-shaped cold plates (1) are symmetrically assembled on the outside of the battery cell (2). The two S-shaped cold plates (1) cooperate with each other to completely cover the front, back, left and right sides of the battery cell (2), forming a liquid-cooled heat exchange structure with full coverage on all four sides. Multiple stacked battery modules (3) are formed by alternating stacking of the battery cells (2) and the S-shaped cold plates (1). The coolant flows in opposite directions to the adjacent S-shaped cold plates (1), forming an interlayer staggered convection temperature equalization structure.

2. The multi-faceted high-efficiency cooling system for power batteries according to claim 1, characterized in that, The S-shaped cold plate (1) is integrally formed by the extrusion process of 6-series aluminum alloy profiles. The overall plate body has no stamping, welding, or splicing structure. The S-shaped meandering flow channel is a meandering design with equal width.

3. The multi-faceted high-efficiency cooling system for power batteries according to claim 1, characterized in that, The internal cavity of the S-shaped cold plate (1) adopts a gradually changing trapezoidal cross section with a wide inlet, a narrow middle section, and an expanded outlet. The cross-sectional area of ​​the high-heat zone flow channel of the S-shaped cold plate (1) is larger than the cross-sectional area of ​​the core zone flow channel.

4. The multi-faceted high-efficiency cooling system for power batteries according to claim 1, characterized in that, In the stacked battery module (3), the S-shaped cold plate (1) of the odd-numbered layers adopts a coolant flow direction of left in and right out, the S-shaped cold plate (1) of the even-numbered layers adopts a coolant flow direction of right in and left out, and the coolant flow direction of the S-shaped cold plate (1) of adjacent layers is opposite.

5. The multi-faceted high-efficiency cooling system for power batteries according to claim 1, characterized in that, It also includes staggered convection liquid cooling pipelines (4) and liquid inlet / outlet integrated interfaces (5). The fluid ports of each of the S-type cold plates (1) are connected in parallel through the staggered convection liquid cooling pipelines (4). The staggered convection liquid cooling pipelines (4) are uniformly connected to the liquid inlet / outlet integrated interfaces (5). The liquid inlet / outlet integrated interfaces (5) are used to connect to the system's total liquid cooling circulation loop.

6. The multi-faceted high-efficiency cooling system for power batteries according to claim 5, characterized in that, The end of the S-shaped cold plate (1) is reserved with a standard fluid interface, which is plugged into the staggered convection liquid cooling pipeline (4) through a sealed joint.

7. The multi-faceted high-efficiency cooling system for power batteries according to claim 1, characterized in that, A highly thermally conductive insulating silicone pad is provided between the S-shaped cold plate (1) and the bonding surface of the battery cell (2).

8. The multi-faceted high-efficiency cooling system for power batteries according to claim 1, characterized in that, It also includes a system enclosure (6), in which the stacked battery module (3) and the S-shaped cold plate (1) are integrated and installed inside the system enclosure (6), and the system enclosure (6) is used to form an overall protection for the internal structure.

9. The multi-faceted high-efficiency cooling system for power batteries according to claim 1, characterized in that, The S-shaped meandering flow channel can be any one of the following: a segmented symmetrical S-shaped flow channel, a wave-shaped continuous flow channel, or a single-bend Z-shaped flow channel.

10. The multi-faceted high-efficiency cooling system for a power battery according to any one of claims 1 to 9, characterized in that, The stacked battery module (3) is divided into multiple units, and the coolant flows in opposite directions to the adjacent S-shaped cold plates (1) within the group. The units are connected in parallel for coolant supply.

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