Liquid-cooled battery pack with good heat dissipation effect

Abstract

This application relates to the field of liquid-cooled battery pack technology and discloses a liquid-cooled battery pack with good heat dissipation performance, including a shell, multiple sets of battery cells, a liquid cooling plate, connecting aluminum busbars, bridging copper busbars, positive and negative aluminum busbars, a CCS sampling harness assembly, a BMU battery module management module, a high-voltage connector, a low-voltage communication interface, and a fire nozzle. This liquid-cooled battery pack with good heat dissipation performance achieves basic heat conduction heat dissipation through a single-channel serpentine pipe embedded in the bottom liquid cooling plate. Simultaneously, U-shaped flow channels inside the interlayer plate provide auxiliary heat dissipation from the sides of the battery cells, forming a bidirectional heat dissipation path of bottom heat conduction and side convection. This increases the heat dissipation contact area, solves the problem of insufficient heat dissipation area in traditional bottom liquid cooling systems, improves overall heat dissipation efficiency, and ensures a more uniform temperature distribution of the battery cells. The interlayer plates achieve horizontal sliding insertion through an L-shaped connecting pipe and an annular piston sealing structure, allowing for flexible adjustment of the interlayer plate spacing and expanding the spacing space during installation.

Description

Technical Field

[0001] This application relates to the field of liquid-cooled battery pack technology, specifically to a liquid-cooled battery pack with good heat dissipation performance. Background Technology

[0002] Liquid-cooled battery packs are a battery packaging technology that uses a liquid cooling medium to effectively manage battery temperature and are widely used in electric vehicles, energy storage systems, and other high-performance battery applications.

[0003] A prior patent (publication number: CN222838908U) discloses a liquid-cooled battery pack, including a liquid-cooling plate with an inner cavity for the flow of a cooling medium, one side of which has an inlet for the cooling medium to flow in and an outlet for the cooling medium to flow out; a tray on which the liquid-cooling plate is mounted, and one side of the tray has a groove for the inlet and outlet to be embedded; a battery module fixedly mounted on the liquid-cooling plate; thermally conductive structural adhesive located between the battery module and the liquid-cooling plate; and a top cover having a receiving cavity formed by the periphery and top, which covers the tray, enclosing the battery module. The top cover and the tray enclose the inlet and outlet, which are exposed outside the liquid-cooled battery pack. This utility model provides a liquid-cooled battery pack where the liquid-cooling plate is mounted above the tray, and the battery module is mounted on top of the liquid-cooling plate, making installation and maintenance more convenient. The inlet and outlet of the liquid-cooling plate are directly led out of the liquid-cooled battery pack.

[0004] However, during use, the liquid-cooled battery pack dissipates heat from the battery module through the bottom liquid cooling plate, which has a limited heat dissipation contact area. Furthermore, the battery module is mostly composed of multiple cell groups, and the battery pack cannot adjust the heat dissipation intensity according to the temperature of each cell group. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a liquid-cooled battery pack with good heat dissipation performance, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a liquid-cooled battery pack with good heat dissipation, comprising a shell, multiple sets of battery cells, a liquid cooling plate, connecting aluminum busbars, bridging copper busbars, positive and negative aluminum busbars, a CCS sampling harness assembly, a BMU battery module management module, a high-voltage connector, a low-voltage communication interface, and a fire nozzle. The shell is located above the liquid cooling plate. Each set of battery cells consists of multiple parallel lithium iron phosphate cells. The liquid cooling plate is located at the bottom of the battery cells. The liquid cooling plate has a bottom serpentine cooling pipe inside for cooling the battery cells above it through bottom heat transfer. The connecting aluminum busbars are electrically connected to the positive and negative electrodes of the parallel lithium iron phosphate cells within the same battery cell set. The bridging copper busbars are electrically connected to the connecting aluminum busbars of adjacent battery cell sets, realizing the series connection of each lithium iron phosphate cell set. The positive and negative aluminum busbars are electrically connected to the positive and negative output terminals of the battery cell set.

[0007] Furthermore, the CCS sampling harness assembly is equipped with a temperature sampling unit and a voltage sampling unit, and its sampling points are connected to the connecting aluminum busbar.

[0008] The above scheme is used to collect temperature and voltage signals of each cell or cell group, so as to monitor the temperature of each cell group.

[0009] Furthermore, the BMU battery module management module and the CCS sampling harness assembly are connected by wires to form a signal connection.

[0010] The above method transmits the sampling signal to the BMU battery module management module in real time to achieve parameter monitoring.

[0011] Furthermore, the high-voltage connector and the low-voltage communication interface are electrically connected to the BMU battery module management module.

[0012] The above scheme enables coordinated control of energy transfer, signal interaction, and safety of the battery pack.

[0013] Furthermore, the fire nozzle is mounted on the housing, with its output end located inside the housing and facing the battery pack.

[0014] With the above solution, when the BMU battery module management module detects a thermal runaway signal, it will trigger an external liquid supply device to drive the fire nozzles to spray.

[0015] Furthermore, the inlet and outlet of the bottom serpentine cooling tube are located at one end of the upper surface of the liquid cooling plate.

[0016] The above solution facilitates the connection between users and external refrigerant delivery and circulation equipment.

[0017] Furthermore, the upper surface of the liquid cooling plate is provided with a set of partitions for separating the battery cells and assisting in heat dissipation. The partitions are provided with U-shaped flow channels. Each partition has an inlet pipe and a return pipe fixedly connected to both sides. Each inlet pipe is equipped with a solenoid valve, and each return pipe is equipped with a one-way valve. Each partition is fixedly connected to both ends with a connecting plate, which is fixed to the liquid cooling plate by external bolts.

[0018] The above scheme allows for temperature monitoring of each electrical group through the temperature sampling unit inside the CCS sampling harness assembly. When the temperature of an individual cell group rises, the solenoid valve opens, and the coolant can dissipate heat to the side of the cell group with the higher temperature.

[0019] Furthermore, the liquid cooling plate is internally provided with a C-shaped tube, with an inlet end and an outlet end at each end. Both the inlet and outlet ends of the C-shaped tube are located on one side of the liquid cooling plate. The outer surface of each C-shaped tube is fixedly connected to an L-shaped connecting pipe. Each L-shaped connecting pipe is fixedly embedded in the liquid cooling plate, and the top end of each L-shaped connecting pipe is located above the liquid cooling plate. Each inlet pipe and return pipe are horizontally slidably inserted into the top end of their respective adjacent L-shaped connecting pipes. The outer surface of each inlet pipe and return pipe is fixedly connected with an annular piston, and each annular piston is in close contact with the inner wall of its adjacent L-shaped connecting pipe.

[0020] The above scheme and settings ensure that the inlet and return pipes are connected to the L-shaped connecting pipe, while also allowing adjustment of the distance between the two adjacent partition plates. This facilitates the user's hoisting of the battery cell assembly. After hoisting, the two partition plates clamp the battery cell assembly close to each other, achieving the purpose of separating the battery cell assembly while ensuring tight contact and auxiliary heat dissipation.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0022] This liquid-cooled battery pack with excellent heat dissipation achieves basic heat conduction through a single-channel serpentine pipe embedded in the bottom liquid cooling plate. Simultaneously, the U-shaped flow channel inside the interlayer plate provides auxiliary heat dissipation from the side of the battery cells, forming a bidirectional heat dissipation path of bottom heat conduction and side convection. This increases the heat dissipation contact area, solving the problem of insufficient heat dissipation area in traditional bottom liquid cooling systems, improving overall heat dissipation efficiency, and ensuring a more uniform temperature distribution of the battery cell assembly. The interlayer plate achieves horizontal sliding insertion through an L-shaped connecting pipe and an annular piston sealing structure, allowing for flexible adjustment of the interlayer plate spacing. During installation, it can expand the spacing space to facilitate the placement of battery cell assemblies. After installation, the interlayer plate configuration allows for the separate installation of multiple battery cell assemblies, reducing temperature transfer between them. With the independent solenoid valve control of the inlet pipe, when the CCS sampling harness detects an abnormal temperature in a battery cell assembly, the coolant flow channel of the corresponding interlayer plate can be opened individually to adjust the heat dissipation intensity of the individual battery cell assembly. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application;

[0024] Figure 2 This is a structural diagram of the overall battery cell assembly in this application;

[0025] Figure 3 This is a top view of the overall cell assembly structure of this application;

[0026] Figure 4 This is a structural diagram of the liquid cooling plate and the interplate of this application;

[0027] Figure 5 This is a cross-sectional view of the liquid-cooled plate structure of this application;

[0028] Figure 6 This is a structural diagram of the C-type tube and the bottom serpentine cooling tube of this application;

[0029] Figure 7 This is a structural diagram of the L-type butt joint pipe, inlet pipe, and return pipe of this application.

[0030] Figure 8 This is a partial structural diagram of one end of the interlayer plate in this application;

[0031] Figure 9 This is a diagram of the U-shaped flow channel structure of this application.

[0032] In the picture:

[0033] 1. Housing; 2. Battery cell assembly;

[0034] 3. Liquid cooling plate; 301. Bottom serpentine cooling tube; 302. Liquid inlet; 303. Liquid outlet; 304. Interval plate; 305. U-shaped flow channel; 306. Inlet pipe; 307. Return pipe; 308. Solenoid valve; 309. Check valve; 310. Connecting plate; 311. C-shaped tube; 312. Inlet end; 313. Outlet end; 314. L-shaped connecting pipe; 315. Annular piston;

[0035] 4. Connecting aluminum busbar; 5. Bridging copper busbar; 6. Positive and negative aluminum busbar; 7. CCS sampling harness assembly; 8. BMU battery module management module; 9. High voltage connector; 10. Low voltage communication interface; 11. Fire nozzle. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Please see Figure 1 , Figure 2 and Figure 3 This embodiment of a liquid-cooled battery pack with good heat dissipation includes a housing 1, multiple battery cell groups 2, a liquid cooling plate 3, connecting aluminum busbars 4, bridging copper busbars 5, positive and negative aluminum busbars 6, a CCS sampling harness assembly 7, a BMU battery module management module 8, a high-voltage connector 9, a low-voltage communication interface 10, and a fire nozzle 11. The housing 1 is located above the liquid cooling plate 3 and is used to protect the internal battery cell groups 2. The housing 1 can be fixed to the liquid cooling plate 3 with bolts. Each battery cell group 2 is composed of multiple parallel lithium iron phosphate cells. The liquid cooling plate 3 is located at the bottom of the battery cell group 2. The liquid cooling plate 3 has a bottom serpentine cooling pipe 301 inside, which is used to cool the battery cell group 2 above it through bottom heat transfer. The liquid inlet 302 and liquid outlet 303 of the bottom serpentine cooling pipe 301 are located at one end of the upper surface of the liquid cooling plate 3. The liquid inlet 302 and liquid outlet 303 are connected to an external refrigerant circulation device.

[0038] Please see Figure 1 , Figure 2 and Figure 3The aluminum busbar 4 electrically connects the positive and negative terminals of the lithium iron phosphate cells connected in parallel within the same cell group 2. The bridging copper busbar 5 electrically connects the connecting aluminum busbar 4 of adjacent cell groups 2, realizing the series connection of each lithium iron phosphate cell in cell group 2. The positive and negative aluminum busbar 6 electrically connects the positive and negative output terminals of cell group 2. The CCS sampling harness assembly 7 is equipped with a temperature sampling unit and a voltage sampling unit, whose sampling points are connected to the connecting aluminum busbar 4, for collecting the temperature and voltage signals of each cell or cell group 2. Through the above settings, the temperature of each cell group 2 can be monitored. The BMU battery module management module 8 is connected to the CCS sampling harness assembly 7 via wires. The BMU battery module management module 8 receives and processes temperature and voltage signals. It is connected to the control terminal of the liquid cooling system and transmits the sampled signals to the BMU battery module management module 8 in real time to realize parameter monitoring. The high-voltage connector 9 and the low-voltage communication interface 10 are electrically connected to the BMU battery module management module 8 to realize energy transmission, signal interaction and safety collaborative control of the battery pack. The fire nozzle 11 is installed on the housing 1, with its output end located inside the housing 1 and facing the cell group 2. Its input end is connected to the external liquid supply equipment. When the BMU battery module management module 8 detects a thermal runaway signal, it links the external liquid supply equipment to drive the fire nozzle 11 to spray.

[0039] Please see Figure 4 and Figure 7 , Figure 8 and Figure 9 The upper surface of the liquid cooling plate 3 is provided with a set of partition plates 304 for separating and assisting heat dissipation of the battery cell group 2. The partition plates 304 are provided with U-shaped flow channels 305. Each partition plate 304 has an inlet pipe 306 and a return pipe 307 fixedly connected to both sides. After the refrigerant enters the partition plate 304 through the inlet pipe 306, it flows through the U-shaped flow channels 305 and then returns through the return pipe 307. Each inlet pipe 306 is equipped with a solenoid valve 308, and each return pipe 307 is equipped with a one-way valve 309. Each partition plate 304 is fixedly connected to both ends with a connecting plate 310. The connecting plate 310 is fixed to the liquid cooling plate 3 by external bolts. The temperature of each battery cell group can be monitored by the temperature sampling unit inside the CCS sampling harness assembly 7. When the temperature of an individual battery cell group 2 rises, the solenoid valve 308 opens, and the refrigerant can dissipate heat to the side of the high-temperature battery cell group 2 separately.

[0040] Please see Figure 5 , Figure 6 and Figure 7The liquid cooling plate 3 has a C-shaped tube 311 inside, with an inlet end 312 and an outlet end 313 at its two ends. Both the inlet end 312 and the outlet end 313 of the C-shaped tube 311 are located on one side of the liquid cooling plate 3. The outer surface of each C-shaped tube 311 is fixedly connected to an L-shaped connecting pipe 314. Each L-shaped connecting pipe 314 is fixedly embedded in the liquid cooling plate 3, and the top end of each L-shaped connecting pipe 314 is located above the liquid cooling plate 3. Each inlet pipe 306 and return pipe 307 is horizontally slidably inserted into the top end of its adjacent L-shaped connecting pipe 314. The outer surface of each inlet pipe 306 and return pipe 307 is fixedly connected to the L-shaped connecting pipe 314. Connected to annular pistons 315, each annular piston 315 is in close contact with the inner wall of its adjacent L-shaped connecting pipe 314. Through the above arrangement, it is possible to ensure that the inlet pipe 306 and the return pipe 307 are connected to the L-shaped connecting pipe 314, while also adjusting the distance between the two adjacent partition plates 304, which facilitates the user to hoist the battery cell assembly 2. After hoisting, the battery cell assembly 2 is clamped together by the two partition plates 304, which can achieve the purpose of separating the battery cell assembly 2, while ensuring the tightness of the contact and ensuring the auxiliary heat dissipation effect. The inlet end 312 and outlet end 313 of the C-shaped pipe 311 are connected to the external refrigerant circulation equipment.

[0041] The working principle of the above embodiment is as follows: When the battery pack is charged and discharged, the internal resistance of the cell group 2 causes heat accumulation. The coolant enters the bottom serpentine cooling pipe 301 from the inlet 302 on the upper surface of the liquid cooling plate 3 and flows through the interior of the liquid cooling plate 3. The coolant directly contacts the bottom of the cell group 2 through the aluminum liquid cooling plate 3, absorbing heat. The heated coolant returns to the external circulation equipment from the outlet 303. The serpentine pipe extends the flow path of the coolant, increases the heat exchange area, and reduces the temperature difference of the bottom cells. The CCS sampling harness collects the voltage and temperature signals of each cell group 2 in real time through the aluminum busbar 4 and transmits them to the BMU battery module management module 8. If the temperature of a certain cell group 2 rises abnormally, the solenoid valve 308 of the corresponding interlayer plate 304 is triggered to open. The coolant flows from the C-shaped pipe 311 through the L-shaped connecting pipe 314 into the inlet pipe 306 of the interlayer plate 304 and enters the U-shaped flow channel 305 to directly cool the high temperature cells from the side. In core assembly 2, the one-way valve 309 ensures unidirectional flow of coolant, avoiding backflow interference and significantly reducing the risk of localized high temperatures. During the installation of core assembly 2, the interlayer plate 304 can slide in the L-shaped connecting pipe 314 through the horizontally sliding insertion of the inlet pipe 306 and return pipe 307, thereby widening the spacing of the interlayer plates 304 to facilitate the placement of core assembly 2. After hoisting, the interlayer plates 304 are pushed closer to each other, and a seal is formed between the annular piston 315 and the inner wall of the L-shaped connecting pipe 314, clamping the core assembly 2. When the BMU detects a thermal runaway signal through voltage or temperature change, it activates the fire nozzle 11 through the external liquid supply equipment to spray flame retardant onto the thermally runaway core assembly 2, thereby improving safety.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid-cooled battery pack with good heat dissipation effect, comprising a shell (1), a plurality of groups of battery cells (2), a liquid cooling plate (3), a connecting aluminum bar (4), a bridging copper bar (5), a positive and negative aluminum bar (6), a CCS sampling wire harness assembly (7), a BMU battery module management module (8), a high-voltage connector (9), a low-voltage communication interface (10), and a fire nozzle (11), characterized in that: The housing (1) is located above the liquid cooling plate (3). Each battery cell group (2) is composed of multiple parallel lithium iron phosphate battery cells. The liquid cooling plate (3) is located at the bottom of the battery cell group (2). The liquid cooling plate (3) is provided with a bottom serpentine cooling pipe (301) inside, which is used to cool the battery cell group (2) above it through bottom heat transfer. The connecting aluminum busbar (4) is electrically connected to the positive and negative electrodes of the lithium iron phosphate cells connected in parallel within the same cell group (2). The bridging copper busbar (5) is electrically connected to the connecting aluminum busbar (4) of adjacent cell groups (2), thereby realizing the series connection of each lithium iron phosphate cell group (2). The positive and negative aluminum busbar (6) is electrically connected to the positive and negative output terminals of the cell group (2).

2. The liquid-cooled battery pack with good heat dissipation effect according to claim 1, characterized in that: The CCS sampling harness assembly (7) is equipped with a temperature sampling unit and a voltage sampling unit, and its sampling points are connected to the connecting aluminum busbar (4) for collecting the temperature and voltage signals of each cell or cell group (2).

3. The liquid-cooled battery pack with good heat dissipation effect according to claim 2, characterized in that: The BMU battery module management module (8) and the CCS sampling harness assembly (7) are connected by wires to receive and process temperature and voltage signals. The BMU battery module management module (8) is connected to the control terminal of the liquid cooling system.

4. The liquid-cooled battery pack with good heat dissipation effect according to claim 1, characterized in that: The high-voltage connector (9) and the low-voltage communication interface (10) are electrically connected to the BMU battery module management module (8).

5. The liquid-cooled battery pack with good heat dissipation effect according to claim 1, characterized in that: The fire nozzle (11) is mounted on the housing (1), with its output end located inside the housing (1) and facing the battery pack (2).

6. The liquid-cooled battery pack with good heat dissipation effect according to claim 1, characterized in that: The inlet (302) and outlet (303) of the bottom serpentine cooling pipe (301) are located at one end of the upper surface of the liquid cooling plate (3).

7. A liquid-cooled battery pack with good heat dissipation according to claim 1, characterized in that: The upper surface of the liquid cooling plate (3) is provided with a set of partition plates (304) for separating and assisting heat dissipation of the battery cell assembly (2). The partition plates (304) are provided with U-shaped flow channels (305). Each partition plate (304) has an inlet pipe (306) and a return pipe (307) fixedly connected to both sides. Each inlet pipe (306) is equipped with a solenoid valve (308), and each return pipe (307) is equipped with a one-way valve (309). Each partition plate (304) is fixedly connected to both ends with a connecting plate (310). The connecting plate (310) is fixed to the liquid cooling plate (3) by external bolts.

8. A liquid-cooled battery pack with good heat dissipation according to claim 7, characterized in that: The liquid cooling plate (3) is provided with a C-shaped tube (311) inside. The two ends of the C-shaped tube (311) are the inlet end (312) and the outlet end (313) respectively. The inlet end (312) and the outlet end (313) of the C-shaped tube (311) are located on one side of the liquid cooling plate (3). The outer surface of the C-shaped tube (311) is fixedly connected to an L-shaped connecting tube (314). Each L-shaped connecting tube (314) is fixedly embedded in the liquid cooling plate (3). The top end of each L-shaped connecting tube (314) is located above the liquid cooling plate (3). Each inlet tube (306) and return tube (307) is horizontally slidably inserted into the top end of the L-shaped connecting tube (314) that is close to it. The outer surface of each inlet tube (306) and return tube (307) is fixedly connected to an annular piston (315). Each annular piston (315) is in close contact with the inner wall of the L-shaped connecting tube (314) that is close to it.

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