104-string bidirectional heat dissipation liquid-cooled battery PACK structure

Abstract

The utility model discloses a 104-string bidirectional heat dissipation liquid-cooled battery PACK structure which comprises a liquid-cooled plate at the bottom, a plurality of battery modules are fixed on the upper surface of the liquid-cooled plate, a box cover covering the battery modules is further fixed on the liquid-cooled plate, and a plurality of direct-current fans directly facing the battery modules are mounted at the top of the box cover; a plurality of air inlet holes are uniformly formed in the rear part and the side part of the box cover; battery PACK hanging pieces are arranged on the left side and the right side of the battery module, and battery PACK fixing pieces used for installing and fixing the battery module are further fixed to the liquid cooling plate. The battery pack has extremely high heat dissipation efficiency and heat dissipation area and can comprehensively exchange heat with the battery cells from the upper direction and the lower direction, the temperature difference between the battery cells in the single pack can be further reduced through the top air cooling heat dissipation mode, the system consistency is improved, the overall temperature uniformity of the battery cells is guaranteed, and the service life of the battery pack is prolonged. The system temperature difference and the single-cell temperature difference are effectively reduced, and the reliability, the safety, the operation efficiency and the like of the battery system are improved.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a 104-cell bidirectional heat dissipation liquid-cooled battery PACK structure. Background Technology

[0002] Currently, most liquid-cooled battery packs for energy storage on the market adopt a bottom-cooling design, using heat exchange between the bottom of the cells and a liquid cooling plate to heat or dissipate heat from the module cells. However, this design leads to a significant temperature difference between the bottom and top of the cells during charging and discharging, severely affecting cell lifespan and consistency, and also failing to meet the demands of high-rate charging and discharging. Due to the large temperature difference along the height of the cells, the expansion rates of the upper, middle, and lower parts of the module differ during later use, which can threaten the safety and stability of the module during operation. Furthermore, its safety features need improvement. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model proposes a 104-string bidirectional heat dissipation liquid-cooled battery PACK structure.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A 104-cell bidirectional heat dissipation liquid-cooled battery PACK structure includes a bottom liquid-cooling plate, several battery modules fixed on the upper surface of the liquid-cooling plate, a cover covering the battery modules, several DC fans facing the battery modules installed on the top of the cover, multiple air inlets evenly arranged on the rear and sides of the cover, battery PACK hangers on the left and right sides of the battery modules, and battery PACK fixing components for installing and fixing the battery modules are also fixed on the liquid-cooling plate.

[0006] In a further improvement, eight 1P13S battery modules are installed on the liquid cooling plate, with four battery modules in the front row and four in the back row. Adjacent front row battery modules and adjacent rear row battery modules are connected in series via copper busbars on the left and right sides of the modules, respectively. The front row battery modules and the rear row battery modules are connected in series via copper busbars on the front and back of the modules.

[0007] In a further improvement, adjacent front and rear modules are mechanically fixedly connected by a middle module parallel strip, and two adjacent left and right modules are mechanically fixedly connected by a front and rear module parallel strip.

[0008] Further improvements include connecting the leftmost battery module at the front to the PACK positive connector via the main positive copper busbar, and connecting the rightmost battery module at the front to an MSD with a fuse via the main negative copper busbar 1. The MSD is then connected to the PACK main negative connector via the main negative copper busbar 2.

[0009] In a further improvement, a maintenance cover is detachably connected to the front end of the box cover by screws. The front of the maintenance cover is equipped with a BMS communication connector, a fire communication connector and a fire nozzle, and the back is equipped with a PACK-level fire detector and a thermal aerosol fire extinguishing device.

[0010] As a further improvement, DC fans are installed on the front, middle, and rear of each battery module.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. Improved cooling efficiency of liquid-cooled batteries, further reducing the temperature difference between the battery pack and the system.

[0013] 2. Solved the problem of excessive temperature difference between the top and bottom of the battery cells during the charging and discharging operation of the battery module, and improved the consistency of the battery cells in the battery pack.

[0014] 3. Improved battery pack safety redundancy performance. Even if the cooling on one side of the battery pack fails (bottom cooling or top air cooling), the cooling on the other side can still maintain the normal operation of the battery pack, reducing the risk of thermal runaway within the battery pack.

[0015] 4. The bidirectional cooling technology allows for greater heat exchange and a more uniform heat exchange surface distribution, enabling the battery pack to be compatible with high-rate charging and discharging scenarios such as 1C and above.

[0016] 5. Quick and easy assembly with high safety performance. Attached Figure Description

[0017] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0019] To make the purpose, technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples.

[0020] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0021] like Figure 1The 104-cell bidirectional liquid-cooled battery pack shown adopts a bottom-cooling + top-air-cooling bidirectional cooling structure design. Bottom cooling design: After coolant is filled through the left inlet, it flows through the internal channels of the bottom liquid cooling plate 1 to the right outlet. After the module is assembled, the bottom of the cell exchanges heat with the upper surface of the liquid cooling plate, and the coolant carries away (or heats) the heat generated by the cell during operation. Top cooling design: The battery pack cover 8 has one DC cooling fan 9 at each end and the middle of the top of each module, i.e., three DC cooling fans 9 are configured on the top of each module. Air inlets 81 are provided at the rear and sides of the cover 8. When the fans 9 are working, they draw in outside air through the sides and rear of the battery pack. The air flows over the surface of the module, cell, and aluminum busbar for heat exchange, thus carrying away (or heating) the heat generated by the module and cell during operation. Finally, the hot air is discharged through the top of the cover 8.

[0022] The battery pack contains eight 1P13S battery modules 5, arranged in a "4 front, 4 back" configuration. This effectively reduces the width of the battery pack, accommodating the installation requirements of mainstream battery compartments on the market. The front and rear modules, as well as the left and right modules, are connected in series via copper busbars 4 and 7 respectively to prevent accidental connection, effectively reducing the risk of misoperation during production and ensuring safety. The front and rear modules are connected and bound together by a parallel strip 3 in the middle module, and the left and right modules are connected and bound together by a parallel strip 6. Three battery pack lifting devices 2 are designed on each side of the battery pack for lifting and transporting the modules. A battery pack fixing device 22 is designed on each of the left and right sides of the front of the battery pack as a fixing point after the battery pack is placed in the enclosure. The leftmost module at the front is connected to the PACK positive connector 13 via the main positive copper busbar 11. The rightmost module at the front is first connected to an MSD14 with a fuse via the main negative copper busbar 10, and then connected from the MSD to the PACK main negative connector 131 via the main negative copper busbar 12. This ensures that each battery PACK has a fuse connected in series, effectively guaranteeing the safety of the battery PACK and the system after assembly.

[0023] The battery pack features a slave control BMU21 integrated on the front right side, used to collect voltage and temperature signals from the battery modules and, when necessary, manage the balancing of the internal cells. The front of the pack utilizes a single maintenance cover 19 for easy maintenance and increased operating space; removing the cover allows for replacement or repair of the slave control BMU. The left side of the maintenance cover integrates the main positive and negative connectors 13 and the MSD14. The right side integrates the BMS communication connector 16, the fire communication connector 17, and the fire nozzle 18. The fire nozzle 18 can connect to the battery compartment-level fire hydrant system, enabling precise fire protection through pack-level detection and spraying. The front of the pack features a structurally separated primary and secondary design to ensure the electrical safety and anti-interference performance of the pack system. The back of the maintenance cover integrates a PACK-level fire detector 20 and a thermal aerosol fire extinguishing device 15. The fire detector 20 can monitor changes in parameters such as electrolyte gas (VOC), combustion characteristic gas (CO), smoke, and temperature generated during lithium battery thermal runaway in real time. Through multi-sensor data fusion algorithms, it determines whether there is a fire hazard or a fire has already occurred, and issues graded alarm information. The thermal aerosol fire extinguishing device 15 serves as the first line of defense in the event of a fire inside the bag. When a fire occurs, the device is triggered to spray extinguishing agents to extinguish and suppress the fire inside the bag.

[0024] The front liquid cooling plate interface of the PACK uses a quick-connect design, and the top cooling fan is installed with external bolts, which facilitates the installation, maintenance and replacement of the battery pack module later.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the essence and scope of the technical solution of this utility model.

Claims

1. A 104-string bidirectional heat dissipation liquid-cooled battery PACK structure, characterized in that, The liquid cooling plate (1) includes a bottom, a plurality of battery modules (5) are fixed on the upper surface of the liquid cooling plate (1), a box cover (8) covering the battery modules (5) is also fixed on the liquid cooling plate (1), a plurality of direct-current fans (9) facing the battery modules (5) are installed on the top of the box cover (8); a plurality of air inlet openings (81) are uniformly arranged on the rear and side portions of the box cover (8); battery PACK hangers (2) are arranged on the left and right sides of each battery module (5), and a battery PACK fixing member (22) is also fixed on the liquid cooling plate (1) and used for mounting and fixing the battery modules (5).

2. The 104-string bi-directional liquid-cooled battery PACK structure of claim 1, wherein, Eight 1P13S battery modules (5) are installed on the liquid cooling plate (1), and the battery modules (5) are arranged in a manner that four battery modules (5) are arranged in the front row and four battery modules (5) are arranged in the rear row; the adjacent battery modules (5) in the front row and the adjacent battery modules (5) in the rear row are respectively connected in series by module left-right series copper bars (7).

3. The 104-string bi-directional liquid-cooled battery PACK structure of claim 2, wherein, The adjacent modules in the front and rear are mechanically fixed and connected by middle module parallel bars (3), and the left and right adjacent two modules are mechanically fixed and connected by front and rear module parallel bars (6).

4. The 104-string bi-directional liquid-cooled battery pack structure of claim 2, wherein, The leftmost battery module (5) in the front is connected in series to a PACK positive connector (13) through a total positive copper bar (11), the rightmost battery module (5) in the front is connected in series to an MSD (14) with a fuse through a total negative copper bar (10), and then the MSD (14) is connected in series to a PACK total negative connector (131) through a total negative copper bar (12).

5. The 104-string bi-directional liquid-cooled battery pack structure of claim 1, wherein, The front end of the box cover (8) is detachably connected with a maintenance cover (19) through screws, the maintenance cover (19) is provided with a BMS communication connector (16), a fire-fighting communication connector (17) and a fire-fighting nozzle (18) on the front surface, and is provided with a PACK fire-fighting detector (20) and a hot gas aerosol extinguishing device (15) on the back surface.

6. The 104-string bi-directional liquid-cooled battery pack structure of claim 1, wherein, Direct-current fans (9) are installed on the front, middle and rear of each battery module (5).

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