Battery cell heat dissipation assembly of low-voltage power supply

Abstract

The utility model provides a kind of low-voltage power supply's electric core heat dissipation assembly, including shell and battery assembly, shell includes two parts of box and base, the bottom surface of box is provided with opening, and the opening of box is sealed by base connection;Battery assembly is installed in box by first fixed plate and second fixed plate oppositely arranged on two sides, and first fixed plate and second fixed plate are respectively located on the two side walls of opposite side of box, and connected with the top side of box, and the electric core of battery assembly is transversely arranged between first fixed plate and second fixed plate, and water cooling flat tube is also provided on battery assembly.The utility model constructs closed loop framework by first fixed plate and second fixed plate vertical connection in shell, and electric core is transversely arranged to form reinforcing structure.BMS and BDU are placed in the accommodating space formed by fixed plate and side wall, and the integral heat-conducting frame fills the inside gap of electric core, and water cooling flat tube is attached to the outside of electric core group to achieve active cooling, improve heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery pack structure technology, and in particular to a cell heat dissipation component for a low-voltage power supply. Background Technology

[0002] Vehicle low-voltage power supply systems (such as 12V or 24V low-voltage batteries) have gradually shifted from traditional lead-acid batteries to lithium-ion batteries. However, traditional vehicle low-voltage power supply designs have inherent defects in terms of structure, thermal management, and system integration, which restricts their development and application.

[0003] In terms of structural layout, components such as battery cells, battery management system (BMS), and battery disconnection unit (BDU) are usually distributed or simply stacked and connected by wiring harnesses. This not only occupies vertical space, resulting in a large power assembly that contradicts the compact layout requirements of vehicles, but also increases connection impedance, failure rate, and assembly cost due to the use of a large number of wiring harnesses.

[0004] In terms of thermal management, with the application of solid-state BDUs, such as using semiconductor devices like MOSFETs to replace traditional mechanical relays, a significant amount of Joule heat is generated during operation. Insufficient heat dissipation will lead to excessively high junction temperatures in the MOSFETs, causing performance degradation or even damage. Existing solutions mostly use natural air cooling or simple thermal conductive adhesive, which has low heat dissipation efficiency and is difficult to meet their heat dissipation requirements.

[0005] Meanwhile, if the heat generated by the battery cell under fast charging or high load conditions cannot be dissipated in time, it will affect its lifespan and safety performance. Traditional solutions lack efficient and uniform cell-level heat dissipation methods and usually rely on environmental cooling of the power supply assembly, which has limited effectiveness.

[0006] Therefore, there is an urgent need for a highly integrated, compact, and heat-efficient automotive low-voltage power supply solution. It needs to optimize the structure, integrate the BMS and BDU modules to reduce size; design efficient active cooling for the high-heat-generating solid-state BDU module; and design effective active cooling schemes for the battery cells to ensure temperature uniformity and safety of the battery assembly. Utility Model Content

[0007] This invention provides a cell heat dissipation component for a low-voltage power supply, which solves the technical problems of defects in the structure, thermal management and system integration of traditional vehicle low-voltage power supply designs.

[0008] This utility model provides a cell heat dissipation assembly for a low-voltage power supply, including a housing and a battery assembly. The housing includes a box and a base. The bottom surface of the box has an opening, which is sealed and connected to the opening of the box by the base. The battery assembly is installed in the box through a first fixing plate and a second fixing plate arranged opposite to each other on both sides. The first fixing plate and the second fixing plate are located on the opposite side walls of the box and connected to the top side of the box. The battery cells of the battery assembly are horizontally placed between the first fixing plate and the second fixing plate. A connecting post is also installed between the first fixing plate and the second fixing plate. A water-cooled flat tube is also provided on the battery assembly.

[0009] In one embodiment of the present invention, a first accommodating space and a second accommodating space are formed between the first fixing plate and the second fixing plate and the side wall of the housing, respectively, and a BMS module and a BDU module are respectively installed in the first accommodating space and the second accommodating space.

[0010] In one embodiment of this utility model, the connecting post connects the first fixing plate and the second fixing plate along the gap between multiple battery cells.

[0011] In one embodiment of the present invention, a water-cooled flat tube is wound around the outside of a battery cell assembly integrating multiple battery cells, and the water-cooled flat tube is attached to the outer surface of the battery cell outline on the outside of the battery cell assembly.

[0012] In one embodiment of the present invention, a heat-conducting frame is installed inside the battery cell assembly integrating multiple battery cells. The heat-conducting frame is attached to the outline surface of the battery cells inside the battery cell assembly, and a clearance space for connecting posts is provided on the heat-conducting frame.

[0013] In one embodiment of the present invention, the connector of the water-cooled flat tube is disposed on the base of the housing and extends to the outside of the base of the housing.

[0014] In one embodiment of the present invention, the heat-conducting frame is an integral structure, and the heat-conducting frame fills the gaps between the cells inside the cell assembly.

[0015] In one embodiment of the present invention, an electrical connector is provided between the BMS module and the BDU module, and the electrical connector is also provided with an electrical port extending through to the outside of the housing.

[0016] In one embodiment of this utility model, a supporting foam is provided between the upper and lower sides of the battery cell and the housing.

[0017] In one embodiment of this utility model, the battery cell is a cylindrical battery cell, with the positive and negative terminals of the battery cell facing the first fixing plate and the second fixing plate, respectively.

[0018] The beneficial effects of this utility model are as follows: This utility model proposes a cell heat dissipation assembly for a low-voltage power supply. A closed-loop frame is constructed by vertically connecting a first fixing plate and a second fixing plate in the housing, with the cells arranged laterally within this frame to form a reinforcing structure. The BMS and BDU are respectively placed in the receiving space formed by the fixing plate and the side wall. An integrated heat-conducting frame fills the gaps inside the cells, and water-cooled flat tubes are attached to the outside of the cell assembly to achieve active cooling and improve heat dissipation efficiency. This achieves improved impact resistance and heat dissipation efficiency within the same volume, achieving a balance between space efficiency and reliability in the low-voltage power supply. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0020] In the attached diagram:

[0021] Figure 1 This is a schematic diagram of the structure of a low-voltage power supply provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a low-voltage power supply housing in a separated state according to one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the fixing plate and connecting column of the low-voltage power supply in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a mechanical BDU module in one embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure between the battery cell, the water-cooled flat tube, and the heat-conducting frame in one embodiment of the present invention.

[0026] The attached figures are labeled as follows:

[0027] 100. Housing; 110. Box; 120. Base; 200. Battery assembly; 210. Battery cell; 220. First fixing plate; 221. First receiving space; 230. Second fixing plate; 231. Second receiving space; 240. Connecting post; 300. BMS module; 400. BDU module; 500. Water-cooled flat tube; 510. Heat conduction frame; 511. Clearance space; 600. Electrical connector; 610. Electrical port; 700. Terminal post; 800. Supporting foam. Detailed Implementation

[0028] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0031] Please see Figures 1 to 5 , Figure 1 and Figure 2 A low-voltage power supply cell heat dissipation assembly provided in one embodiment of the present invention includes a housing 100 and a battery assembly 200. The housing 100 includes a box body 110 and a base 120. The bottom surface of the box body 110 has an opening, which is sealed and connected to the opening of the box body 110 through the base 120. The battery assembly 200 is installed in the box body 110 through a first fixing plate 220 and a second fixing plate 230 arranged opposite to each other on both sides. The first fixing plate 220 and the second fixing plate 230 are respectively located on the opposite side walls of the box body 110 and connected to the top side of the box body 110. The battery cell 210 of the battery assembly 200 is horizontally placed between the first fixing plate 220 and the second fixing plate 230. A connecting post 240 is also installed between the first fixing plate 220 and the second fixing plate 230. A water-cooled flat tube 500 is also provided on the battery assembly 200.

[0032] Specifically, in this embodiment of the present invention, the housing 100 may include two parts: a box body 110 and a base 120. An opening is provided on the bottom surface of the box body 110, and the opening of the box body 110 is sealed and connected by the base 120 to complete the assembly of the battery assembly 200. The internal space of the housing 100 is divided by a pair of oppositely arranged fixing plates. The first fixing plate 220 and the second fixing plate 230 may be located at positions corresponding to the two side walls of the housing 100, for example, perpendicular to the bottom and top surfaces of the housing 100. The first fixing plate 220 and the second fixing plate 230 may be connected to the top of the housing 100, i.e., the top surface of the box body 110, to form a support frame for the battery assembly 200 (see reference). Figures 3 to 4 In this design, the top ends of the two fixing plates can be connected to the upper part of the housing 100 (i.e., the top surface of the box 110) via studs. This allows the two fixing plates to become extension components of the housing 100 structure, making the battery assembly 200 and the housing 100 form an integral structure and improving structural stability. By using the two fixing plates to hoist and secure the battery assembly 200 inside the housing 100, when the base 120 is assembled into the bottom opening of the box 110, there is no need to consider potential interference or positioning errors between it and the battery assembly 200.

[0033] Furthermore, by employing a horizontal arrangement, the battery cells 210 in the battery assembly 200 are installed between two fixing plates. Compared to the vertical arrangement, this changes the size requirements of the housing 100. The horizontal arrangement of the battery cells 210 fully utilizes the space in the length or width direction of the housing 100, allowing the array of battery cells 210 to extend parallel to the sidewalls of the housing 100. This layout effectively reduces the overall height dimension of the power supply, providing installation convenience in height-constrained areas such as vehicle chassis. Moreover, the vertical relationship between the two fixing plates and the battery cells 210 forms a direct load transfer path. When external vibrations are transmitted to the housing 100, the vibration energy is evenly distributed throughout the entire array of battery cells 210 through the fixing plates, avoiding structural damage caused by stress concentration in localized battery cells 210. Simultaneously, the large contact area between the battery cells 210 and the fixing plates naturally forms a heat dissipation channel. The heat generated by the battery cells 210 during operation can be conducted along the fixing plates to the sidewalls of the housing 100, utilizing the heat capacity of the metal housing 100 for passive temperature control. Additionally, the heat exchange performance can be enhanced through water-cooled flat tubes 500.

[0034] Thus, by connecting the first fixing plate 220 and the second fixing plate 230 to the housing 100, the fixing plates serve as a structural skeleton to strengthen the rigidity of the battery assembly 200 and the housing 100, reducing the need for independent brackets. Furthermore, the horizontal arrangement of the battery cells 210 compresses the vertical space occupied by the power supply, adapting to flat installation scenarios. The connection between the battery cells 210 and the fixing plates forms a physical protective layer, suppressing displacement of the battery cells 210 under vehicle vibration conditions. The overall design achieves a balance between space efficiency and structural reliability through minimalist mechanical interfaces, enhancing the applicability of low-voltage power supply deployment in limited spaces.

[0035] Please see the appendix Figure 2 In one embodiment, a first accommodating space 221 and a second accommodating space 231 are formed between the first fixing plate 220 and the second fixing plate 230 and the side wall of the housing 100, respectively. The first accommodating space 221 and the second accommodating space 231 are respectively equipped with a BMS module 300 and a BDU module 400.

[0036] Specifically, in this embodiment of the invention, the low-voltage power supply achieves functional partitioning through the cooperation of a fixing plate and a housing 100. The first fixing plate 220 and the second fixing plate 230 are spaced apart from the corresponding sidewalls of the housing 100 in the vertical direction, and the gap between them naturally forms two independent cavities: a first accommodating space 221 is located between the first fixing plate 220 and the adjacent sidewall, and a second accommodating space 231 exists between the second fixing plate 230 and the opposite sidewall. By directly using the fixing plate as a separating medium, physical isolation is achieved within the power supply while maintaining its overall compactness. (See attached diagram.) Figure 2 The area marked with a red box in the middle can be understood as the region corresponding to the first receiving space 221 and the second receiving space 231 formed between the first fixing plate 220, the second fixing plate 230 and the upper part of the shell 100, i.e., the box 110. And in the attached... Figure 2 The battery assembly 200 shown does not have a water-cooled flat tube 500 structure installed, therefore it is not shown in the diagram. Figure 2 The main purpose is to demonstrate the storage space formed between the battery assembly 200 and the housing 100.

[0037] More specifically, the shape of the housing space is controlled by the distance between the fixing plate and the side wall, and its width can be adapted to the size of standard electronic modules. For example, the BMS module 300 integrated and installed in the first housing space 221 is close to the outer surface of the first fixing plate 220, and its wiring harness can be connected to the inner battery cell 210 through the pre-set holes in the fixing plate, shortening the high-voltage wiring distance. Simultaneously, the BDU module 400 carried in the second housing space 231 forms surface contact with the second fixing plate 230, and its power terminals directly penetrate the fixing plate and connect to the battery cell 210 array. The BDU module 400 can be a mechanical BDU module 400 composed of relays, fuses, etc., or a solid-state BDU module 400 composed of MOSFETs, circuits, etc. This layout places both the BMS and BDU, the two core components, in the indirect influence zone of the battery cell 210's heat radiation, which not only avoids the battery cell 210's temperature directly impacting sensitive electronic components, but also utilizes the thermal conductivity of the metal fixing plate to establish a buffered heat transfer path. Additionally, epoxy boards can be installed on the two fixing plates to form effective insulation between the 210 battery cell, BMS, and BDU.

[0038] Thus, by using the mounting plate as the mounting base for the electrical modules (BMS and BDU) and as the support for the battery cells 210, the weight and assembly complexity caused by independent brackets are reduced. Furthermore, the mounting plate between the electrical modules and the battery cells 210 acts as a rigid isolation layer, effectively suppressing the transmission of mechanical vibrations, thereby providing a more stable operating environment for vulnerable components such as relays or fuses in the BDU module 400. This results in improved electrical safety and system reliability within the same volume.

[0039] Please see the appendix Figure 3 In one embodiment, a connecting post 240 is also provided between the first fixing plate 220 and the second fixing plate 230, and the connecting post 240 connects the first fixing plate 220 and the second fixing plate 230 along the gap between the plurality of battery cells 210.

[0040] Specifically, in this embodiment of the invention, the mechanical properties of the low-voltage power supply fixing plate structure (first fixing plate 220 and second fixing plate 230) are optimized through connecting posts 240. In the gap between the first fixing plate 220 and the second fixing plate 230, the connecting posts 240 are arranged along the gaps formed by the arrangement of multiple battery cells 210, with their two ends rigidly connected to the inner surfaces of the first fixing plate 220 and the second fixing plate 230, respectively. This arrangement utilizes the natural gaps in the array of battery cells 210, avoiding the occupation of additional space, and ensuring that the axial direction of the connecting posts 240 is parallel to the arrangement direction of the battery cells 210, forming a through-type support frame. The installation position of the connecting posts 240 corresponds to the gaps between the battery cells 210, ensuring a uniform distribution of connection points between the fixing plates and eliminating weak points in the structure.

[0041] More specifically, the connecting post 240 significantly enhances the overall rigidity of the fixing plate system. When external vibration or impact is transmitted to the housing 100, the connecting post 240, acting as a lateral reinforcement, locks the two fixing plates into a unified whole, suppressing relative displacement tendencies. This constraint effect directly protects multiple cells 210 from torsional forces, preventing damage to the electrodes of the cells 210 due to displacement, while maintaining the stable positioning of the cells 210 in the gaps. By distributing along the path of the gaps between the cells 210, the connecting post 240 also acts as a load transfer medium, uniformly distributing local stress throughout the entire battery assembly 200, improving the reliability of the power supply under dynamic operating conditions.

[0042] Thus, by adding connecting posts 240 to strengthen the mechanical clearance between the fixing plates, there is no need to change the arrangement of the battery cells 210 or add independent supports. Furthermore, its path along the gaps between the battery cells 210 optimizes structural efficiency, enabling the power supply to achieve a higher fatigue life within a compact volume. Overall assembly is therefore simplified, and the direct connection mechanism of the connecting posts 240 reduces the need for bolts and other auxiliary components, lowering complexity. This enhances the durability of the low-voltage power supply in vehicle applications.

[0043] Please see the appendix Figure 4 and Figure 5 In one embodiment, a water-cooled flat tube 500 is wound around the outside of a battery cell assembly comprising multiple battery cells 210. The water-cooled flat tube 500 is attached to the outline surface of the battery cells 210 on the outside of the battery cell assembly. A heat-conducting frame 510 is installed inside the battery cell assembly comprising multiple battery cells 210. The heat-conducting frame 510 is attached to the outline surface of the battery cells 210 on the inside of the battery cell assembly, and a clearance space 511 for connecting posts 240 is provided on the heat-conducting frame 510.

[0044] Specifically, in this embodiment of the invention, the thermal management of the low-voltage power supply achieves efficient temperature control of the battery cell assembly through the synergistic effect of the water-cooled flat tube 500 and the heat-conducting frame 510. The water-cooled flat tube 500 is wound around the outside of the battery cell assembly, with its tube contour conforming to the outer surface of the battery cell 210, forming a wrap-around contact. This attachment method maximizes the heat exchange area, ensuring that the coolant can quickly remove heat from the surface of the battery cell 210 when flowing. The winding path of the flat tube is distributed circumferentially along the battery cell assembly, covering most of the exposed surface, minimizing the heat transfer path and reducing thermal resistance accumulation. At the same time, the flexibility of the flat tube allows it to fully conform to the shape contour of the battery cell 210 surface and can adapt to the slight deformation of the battery cell assembly, maintaining long-term contact reliability.

[0045] Furthermore, a customized heat-conducting frame 510 is installed inside the battery cell assembly. Its surface structure matches the contour of the battery cell 210, and it is attached to the surface of the battery cell 210 inside the battery cell assembly via surface contact. The heat-conducting frame 510 acts as an internal heat conduction medium, transferring the heat generated by the battery cell 210 from the central area to the outside, overcoming the limitation that the water-cooled flat tube 500 cannot directly cool the inner surface. The pre-set clearance space 511 on the heat-conducting frame 510 corresponds to the size of the connecting post 240, ensuring no interference when the connecting post 240 passes through, while maintaining the structural continuity of the heat-conducting frame 510 itself. This avoids interference with the connecting post 240 while ensuring the integrity of the heat conduction path.

[0046] Thus, the water-cooled flat tube 500 and the heat-conducting frame 510 together form a dual thermal management network. The water-cooled flat tube 500 is responsible for external active heat dissipation, directly dissipating heat through coolant circulation; the heat-conducting frame 510 redistributes internal heat, guiding heat energy from the center to the outer cooling area. This combination effectively eliminates temperature gradients within the cell assembly, preventing localized overheating and thus improving the temperature consistency and cycle life of the battery pack 200. Passive thermal equalization is achieved through physical contact heat conduction, optimizing heat dissipation efficiency within a limited space.

[0047] In one embodiment, the connector of the water-cooled flat tube 500 is disposed on the base 120 of the housing 100 and extends to the outside of the base 120 of the housing 100. The heat-conducting frame 510 is an integral structure, and the heat-conducting frame 510 fills the gap between the inner cells 210 of the cell assembly.

[0048] Specifically, in this embodiment of the invention, the thermal management system of the low-voltage power supply optimizes pipeline integration through the layout of the water-cooled flat tube 500 connector. The inlet and outlet connectors of the water-cooled flat tube 500 are directly embedded inside the base 120 of the housing 100, with its connection port penetrating the base 120 and extending to the outside, forming a sealed through-type structure. This design allows the cooling pipeline to be completely integrated into the power supply body, with only the standard interface size remaining on the exposed portion of the connector, eliminating the drawback of traditional side-mounted pipes occupying extra space. The multi-layer sealing ring design at the through-hole ensures zero risk of coolant leakage, while the base 120 itself provides impact protection for the connector, significantly reducing the probability of pipeline loosening under vehicle bumpy conditions.

[0049] Furthermore, the heat-conducting frame 510 can adopt a precision die-cast integrated structure, its shape conforming to the geometric gaps inside the battery cell assembly. In the gaps between adjacent battery cells 210, the heat-conducting frame 510 can extend fractal branches, completely filling the approximately triangular area between the battery cells 210 in a surface contact manner, eliminating the heat conduction blind spots caused by traditional point contact. This filling design allows the heat-conducting frame 510 to form a continuous physical contact with the battery cell assembly, equivalent to constructing a three-dimensional heat conduction network inside the battery cell array 210. Moreover, the clearance space 511 on the heat-conducting frame 510 corresponding to the connecting post 240 can serve as a reserved thermal expansion margin, avoiding structural stress under high-temperature conditions.

[0050] Thus, the integrated design of the water-cooled flat tube 500 connector and the base 120, combined with the fully filled structure of the heat-conducting frame 510, achieves the temperature control effect of the thermal management system. The water-cooled flat tube 500 shortens the external connection path through its built-in connector and utilizes its flexibility to connect the battery pack 200 cells 210 fixed to the upper housing 110 of the casing 100 to the interface of the base 120 of the casing 100, thereby improving its structural resistance to damage. The gap filling of the heat-conducting frame 510 improves the heat conduction efficiency of the cell assembly, keeping the temperature difference between the cells 210 within the cell assembly at a uniform level. The vertical layout of the connector passing through the base 120 facilitates the integration of cooling pipes at the vehicle level; during maintenance, only the base 120 needs to be disassembled to complete the entire cooling circuit inspection. This achieves improved heat dissipation efficiency and maintenance convenience while maintaining the compactness of the power system structure.

[0051] Please see the appendix Figure 1 and Figure 4 In one embodiment, an electrical connector 600 is provided between the BMS module 300 and the BDU module 400, and the electrical connector 600 is also provided with an electrical port 610 extending to the outside of the housing 100.

[0052] Specifically, in this embodiment of the invention, the electrical connection between low-voltage power supply modules can achieve efficient transmission and external interaction through integrated design. Between the BMS module 300 and the BDU module 400, a dedicated electrical connector 600 connects the first receiving space 221 and the second receiving space 231 along the cell assembly area. An extension branch with a sensor can also be installed in the cell assembly area to monitor the temperature parameters of the cell assembly area and provide feedback to the water-cooling system. Simultaneously, both ends of the electrical connector 600 can be rigidly connected to the control interfaces of the two modules via shock-resistant plugs. The directional path layout shortens the length of the wiring harness between modules and eliminates the electromagnetic interference risk caused by traditional cable loops. The main body of the electrical connector 600 can be embedded in a clamp at a corresponding position on the battery assembly 200. The clamp structure provides positioning, constrains displacement caused by vibration, and ensures the connection stability of the connector under continuous vehicle vibration conditions. Thus, the direct connection between modules via the electrical connector 600 reduces control signal transmission delay, improves the response speed of the battery system, and the exposed standard interface design facilitates electrical connection operations. A highly reliable external interaction channel is constructed while maintaining system compactness.

[0053] In one embodiment, the low-voltage power supply terminal 700 is disposed on the top of the housing 100, and the terminal 700 and the electrical port 610 are located on the side near the BDU module 400.

[0054] Specifically, in this embodiment of the invention, the positive and negative terminals 700 of the low-voltage power supply are centrally located on the top plane of the housing 100, with their installation positions corresponding to the outer side of the second accommodating space 231 of the BDU module 400. The base of the terminal 700 is directly embedded in a pre-drilled hole in the top plate of the housing 100, and the terminal body extends into the internal space of the housing 100 at its lower end via a bolt structure. The high-voltage output terminal of the BDU module 400 can be directly connected to the bottom of the terminal 700 via a copper busbar or wire. Through spatial design, a direct electrical transmission path is constructed, avoiding the high-voltage line from detouring inside the housing 100.

[0055] Furthermore, the physical proximity of the terminal 700 and the electrical port 610 shortens the transmission distance from the output of the BDU module 400 to the terminal 700, reducing line impedance and power loss. The shortened high-voltage path also attenuates electromagnetic radiation intensity. The concentrated arrangement of the electrical port 610 and the terminal 700 on the housing 100 forms a corresponding EMC shielding area. This area of ​​the housing 100 can be thickened and lined with a metal shielding layer to effectively suppress high-frequency interference conduction. This is particularly suitable for inverter interference protection in vehicle environments, ensuring that the power output waveform meets relevant standard requirements. Thus, by concentrating the terminal 700 and the electrical port 610 on one side of the top of the housing 100, external cable connection operations are optimized. During maintenance, the energy output terminal and control signal terminal can be accessed on the same side of the housing 100, improving maintenance efficiency. Simultaneously, the top plane of the housing 100 is specially reinforced for structural rigidity, with a mesh-like reinforcing rib around the terminal 700 mounting point to ensure structural stability under high torque conditions. This allows the required electrical performance and maintainability to be met within the limited space of the power supply.

[0056] In one embodiment, a support foam 800 is provided between the battery cell 210 and the upper and lower sides of the housing 100.

[0057] Specifically, in this embodiment of the invention, support foam 800 is disposed as a buffer medium in the gap between the battery cell 210 and the upper and lower sides of the housing 100. The foam block body can be die-cut according to the top and bottom contours of the battery cell 210 array, or it can be compressed and bonded between the battery cell 210 and the housing 100 by utilizing its deformation. The thickness of the support foam 800 is slightly larger than the actual distance between the battery cell assembly and the inner wall of the housing 100, generating a pre-compression amount during assembly to achieve an interference fit so that the foam always maintains continuous pressure on the battery cell 210, eliminating gap changes caused by vibration during vehicle operation. The distribution of support foam 800 covers the entire upper and lower surfaces of the battery cell assembly, forming a continuous pressure-bearing layer to ensure the assembly stability of the battery cell 210 within the housing 100.

[0058] Thus, by absorbing impact energy in the vertical direction through the support foam 800, when the shell 100 is subjected to an instantaneous impact, the foam cushions the impact through elastic deformation, reducing the damage to the battery cell 210 structure caused by inertial forces. The damping characteristics of the support foam 800 material itself can also effectively dissipate broadband vibration energy, such as eliminating the risk of damage to the battery cell 210 structure from high-frequency (200-500Hz) resonance. This improves the mechanical reliability of the battery cell 210 under bumpy vehicle conditions.

[0059] In one embodiment, the battery cell 210 is a cylindrical battery cell, with the positive and negative terminals of the battery cell 210 facing the first fixing plate 220 and the second fixing plate 230, respectively.

[0060] Specifically, in this embodiment of the invention, the selection and structural design of the low-voltage power supply cell 210 are highly adaptable. Cylindrical cells, with their standardized geometric features, are laterally arranged between the first fixing plate 220 and the second fixing plate 230, with their positive and negative terminals facing the inner surfaces of the first fixing plate 220 and the second fixing plate 230 respectively. The standardized dimensions of the cylindrical cells (such as 18650 or 21700 specifications) give this structure good production line compatibility, enabling large-scale assembly without the need for customized cells 210.

[0061] As an energy unit, the cylindrical battery cell 210's directional arrangement of its positive and negative electrodes significantly simplifies the electrical connection path: for example, the first fixing plate 220 integrates a positive busbar, directly connecting the positive terminals of each battery cell 210 via laser welding; the second fixing plate 230 simultaneously integrates a negative busbar, forming the shortest current transmission path. As a structural unit, the cylinder's inherent compressive strength endows the module with high mechanical stability. When external impacts are transmitted to the fixing plate, the densely arranged array of battery cells 210 acts as a honeycomb-like support, distributing the local load to adjacent battery cells 210, thus increasing the overall bending stiffness by more than three times. This structural characteristic is particularly suitable for the multi-directional vibration environment during vehicle operation.

[0062] Thus, by placing the cylindrical cells horizontally so that the electrode connection direction is perpendicular to the fixed plate, the busbar welding operation space can be increased threefold, improving the assembly yield. The uniform strength distribution of the standard 210 cells ensures that the power supply has no structural weak points under extreme operating conditions. Compared to the square 210 cell design, this reduces the amount of structural components used while maintaining higher strength and energy density.

[0063] In summary, this utility model provides a cell heat dissipation assembly for a low-voltage power supply. A closed-loop frame is constructed by vertically connecting a first and second fixing plate in the housing. The cells are arranged laterally within this frame, with the positive and negative electrodes oriented and attached to the fixing plates to shorten the electrical path. Connecting posts penetrate the two plates along the gaps between the cells to form a reinforcing structure. The BMS and BDU are respectively placed in the receiving space formed by the fixing plate and the side wall. Water-cooled flat tubes for thermal management are attached to the outside of the cell assembly for active cooling. An integrated heat-conducting frame fills the gaps inside the cells, improving heat dissipation efficiency. This achieves improved impact resistance and heat dissipation efficiency while reducing assembly complexity within the same volume, achieving a balance between spatial efficiency and reliability in the low-voltage power supply structure.

[0064] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A cell heat dissipation assembly for a low-voltage power supply, characterized in that, include: The housing (100) includes two parts: a box body (110) and a base (120). The bottom surface of the box body (110) is provided with an opening, and the opening of the box body (110) is sealed and connected by the base (120). as well as The battery assembly (200) is installed in the housing (110) via a first fixing plate (220) and a second fixing plate (230) arranged opposite to each other on both sides. The first fixing plate (220) and the second fixing plate (230) are respectively located on the two side walls of the housing (110) and connected to the top side of the housing (110). The battery cell (210) of the battery assembly (200) is horizontally placed between the first fixing plate (220) and the second fixing plate (230). A connecting post (240) is also installed between the first fixing plate (220) and the second fixing plate (230). The battery assembly (200) is also provided with a water-cooled flat tube (500).

2. The heat dissipation assembly according to claim 1, characterized in that, The first fixing plate (220) and the second fixing plate (230) form a first accommodating space (221) and a second accommodating space (231) between the first accommodating space (221) and the second accommodating space (231), respectively. The first accommodating space (221) and the second accommodating space (231) are respectively equipped with a BMS module (300) and a BDU module (400).

3. The heat dissipation assembly according to claim 1, characterized in that, A connecting post (240) is also installed between the first fixing plate (220) and the second fixing plate (230), and the connecting post (240) connects the first fixing plate (220) and the second fixing plate (230) along the gap between the plurality of cells (210).

4. The heat dissipation assembly according to claim 3, characterized in that, The water-cooled flat tube (500) is wound around the outside of the battery cell group (210) integrated by multiple battery cells (210), and the water-cooled flat tube (500) is attached to the outline surface of the battery cell (210) on the outside of the battery cell group.

5. The heat dissipation assembly according to claim 4, characterized in that, A heat-conducting frame (510) is installed inside the battery cell assembly integrating multiple battery cells (210). The heat-conducting frame (510) is attached to the outline surface of the battery cell (210) inside the battery cell assembly, and a clearance space (511) for the connecting post (240) is provided on the heat-conducting frame (510).

6. The heat dissipation assembly according to claim 4, characterized in that, The connector of the water-cooled flat tube (500) is located on the base (120) of the housing (100) and extends to the outside of the base (120) of the housing (100).

7. The heat dissipation assembly according to claim 5, characterized in that, The heat-conducting frame (510) is an integral structure, and the heat-conducting frame (510) fills the gap between the battery cells (210) inside the battery cell assembly.

8. The heat dissipation assembly according to claim 2, characterized in that, An electrical connector (600) is provided between the BMS module (300) and the BDU module (400), and the electrical connector (600) is also provided with an electrical port (610) extending through to the outside of the housing (100).

9. The heat dissipation assembly according to claim 1, characterized in that, Supporting foam (800) is provided between the battery cell (210) and the upper and lower sides of the housing (100).

10. The heat dissipation assembly according to claim 1, characterized in that, The battery cell (210) is a cylindrical battery cell, and the positive and negative terminals of the battery cell (210) are respectively facing the first fixing plate (220) and the second fixing plate (230).

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