Liquid-cooled battery pack and assembled energy storage cabinet thereof

Abstract

The utility model discloses liquid cooling battery pack and energy storage cabinet of assembly thereof, set up the middle confluence flow channel in the middle area of battery pack radiating surface, adopt two liquid inlet flow channel and enter liquid from the two outside of battery pack radiating surface, and cooling liquid passes through a plurality of parallel shunt flow channel and synchronously converges from the outside of battery pack radiating surface to the middle area, and the cooling liquid temperature difference between shunt flow channel is smaller, can carry out the overall equivalent heat exchange of battery pack radiating surface, and the cooling liquid of all shunt flow channel converges to the middle confluence flow channel finally, increases the residence time of cooling liquid in the core heating area of battery pack, has improved the heat exchange efficiency of battery pack radiating surface middle area, effectively reduces the temperature difference of each area of battery pack, especially can effectively alleviate the abnormal high temperature of the middle area of the battery pack in the energy storage cabinet of stacking because of temperature gathering, guarantees the energy storage cabinet and the battery pack work temperature consistency of assembly in it.

Description

Technical Field

[0001] This utility model relates to a liquid-cooled battery pack and its assembled energy storage cabinet, belonging to the temperature control technology of new energy storage batteries. Background Technology

[0002] In the thermal management system of battery packs in liquid-cooled energy storage cabinets, the traditional parallel flow channel design is a common cooling solution. For example, Chinese patent application CN202221982866.3 discloses a water-cooled plate for battery packs with temperature equalization function. This solution usually uses a single inlet and outlet. The coolant flows in from one side of the battery pack and is evenly distributed to each area of ​​each battery pack through multiple parallel flow channels, and finally flows out from the other side. The main features of this design include: the cooling pipes consist of multiple parallel branches, each of similar length, covering different areas of the battery pack to ensure uniform coolant flow through each battery module; the coolant flows in one direction without crossing or merging between channels, relying on pressure balance within the pipes to achieve flow distribution; due to the long flow channels, the coolant gradually absorbs heat and heats up during flow, leading to reduced cooling efficiency in areas of the battery pack far from the inlet, potentially creating localized high-temperature zones and affecting temperature uniformity; traditional designs have weaker cooling effects on the central area of ​​the battery pack, which may result in higher central temperatures, especially under high-temperature or high-load conditions, exacerbating temperature differences between batteries and affecting overall performance and lifespan.

[0003] Optimizing the cooling channel structure design is the primary method to solve the temperature difference problem in liquid-cooled battery packs. While traditional parallel channel designs are simple in structure, in large-capacity battery packs, they can easily lead to a gradual increase in coolant temperature along the flow direction, resulting in excessive temperature differences within the battery pack. Current optimization solutions mainly include the use of serpentine channels and variable cross-section channels.

[0004] The serpentine flow channel, by increasing the channel length and changing the flow direction, can improve the turbulence of the coolant and enhance the heat exchange effect. For example, Chinese patent application CN202222125771.6 discloses a water-cooled plate for a series battery pack. However, in this design, the coolant flows in from one side and then travels a long distance to exit from the other side, resulting in a significant increase in coolant temperature at the end region. Actual measurement data shows that the temperature rise at the end of the coolant flow channel from entry to exit can reach 8-12°C, causing a significant temperature difference between the two sides of the battery pack. At the same time, because the central region is far from both the inlet and outlet, the coolant flow rate is insufficient, forming local high-temperature zones. The temperature difference between different regions inside the battery pack can reach 5-8°C, seriously affecting the consistency of battery performance and cycle life. Furthermore, the coolant has to change its flow direction multiple times during the long-distance flow, which often leads to increased flow resistance and pressure drop, requiring a more powerful cooling pump and increasing system energy consumption.

[0005] Variable cross-section flow channels balance the flow rate and velocity of coolant in different areas by adjusting the cross-sectional dimensions of the flow channels. Although this can improve the temperature uniformity of the coolant to a certain extent, the complex variable cross-section flow channel structure also increases the difficulty and cost of heat dissipation flow channel processing, which has certain limitations in large-scale production. Summary of the Invention

[0006] The technical problem solved by this utility model is to provide a liquid-cooled battery pack and its assembled energy storage cabinet, addressing the problem of uneven cooling in the liquid cooling channel design of existing battery packs.

[0007] This utility model is achieved using the following technical solution:

[0008] This utility model first discloses a liquid-cooled battery pack. A cooling channel for coolant flow is arranged on the heat dissipation surface 100 of the battery pack. The cooling channel includes a first inlet channel 21, a second inlet channel 22, a central confluence channel 23, and several branch channels. The heat dissipation surface 100 of the battery pack is a rectangular surface. The central confluence channel 23 is arranged along the center line of the rectangular surface. The first inlet channel 21 and the second inlet channel 22 are located on both sides of the central confluence channel 23 and are arranged along two parallel sides of the rectangular surface. The first inlet channel 21 and the central confluence channel 23, as well as the second inlet channel 22 and the central confluence channel 23, are connected by several parallel branch channels. Both the first inlet channel 21 and the second inlet channel 22 have an inlet at one end and are closed at the other end. The central confluence channel 23 has an outlet 231 at one end and is closed at the other end.

[0009] In the liquid-cooled battery pack described above, the inner surface of the intermediate confluence channel 23 is further provided with a spiral groove 232 to accelerate the turbulent mixing of the cooling liquid flowing through the multiple branch channels.

[0010] In the liquid-cooled battery pack of the present invention, the first branch channel 24 between the first liquid inlet channel 21 and the intermediate confluence channel 23 is arranged equidistantly and perpendicularly to the first liquid inlet channel 21; the second branch channel 25 between the second liquid inlet channel 22 and the intermediate confluence channel 23 is arranged equidistantly and perpendicularly to the second liquid inlet channel 22.

[0011] In the liquid-cooled battery pack described above, the first diversion channel 24 and the second diversion channel 25 are respectively provided with a one-way valve 26 at the docking end with the intermediate confluence channel 23.

[0012] This utility model also discloses a second type of liquid-cooled battery pack, in which a heat dissipation channel for coolant flow is arranged on the heat dissipation surface 100 of the battery pack. The heat dissipation channel includes a first liquid inlet channel 21, a second liquid inlet channel 22, a central confluence channel 23, and several branch channels. The heat dissipation surface 100 of the battery pack is a rectangular surface. The central confluence channel 23 is arranged along the diagonal of the rectangular surface. The first liquid inlet channel 21 and the second liquid inlet channel 22 are located on both sides of the central confluence channel 23 and along... The rectangular surface has two vertical sides. The first liquid inlet channel 21 and the intermediate confluence channel 23, as well as the second liquid inlet channel 22 and the intermediate confluence channel 23, are connected by several parallel branch channels. The first liquid inlet channel 21 and the second liquid inlet channel 22 have liquid inlets at their proximal ends relative to the intermediate confluence channel 23 and are closed at their distal ends. The intermediate confluence channel 23 has a liquid outlet 231 at its distal end relative to the first liquid inlet channel 21 and the second liquid inlet channel 22 and is closed at its proximal end.

[0013] In the second type of liquid-cooled battery pack of this utility model, the inner surface of the intermediate confluence channel 23 is further processed with a spiral groove 232 to accelerate the turbulent mixing of the cooling liquid flowing from multiple branch channels.

[0014] In the second type of liquid-cooled battery pack of this utility model, the first branch channel 24 between the first liquid inlet channel 21 and the intermediate confluence channel 23 is arranged at equal intervals perpendicular to the first liquid inlet channel 21; the second branch channel 25 between the second liquid inlet channel 22 and the intermediate confluence channel 23 is arranged at equal intervals perpendicular to the second liquid inlet channel 22.

[0015] In the second type of liquid-cooled battery pack of this utility model, the first diversion channel 24 and the second diversion channel 25 are respectively provided with a one-way valve 26 at the docking end with the intermediate confluence channel 23.

[0016] In the second type of liquid-cooled battery pack of this utility model, preferably, the heat dissipation surface of the battery pack is a square surface.

[0017] This utility model also discloses an energy storage cabinet, in which the stacked battery packs all adopt any of the liquid-cooled battery packs mentioned above. The inlet and outlet of the heat dissipation channel of the liquid-cooled battery pack are connected to the coolant heat exchange circulation system of the energy storage cabinet. The inlet of the first liquid inlet channel 21 and the second liquid inlet channel 22 of each layer of liquid-cooled battery pack is provided with a flow ratio regulating valve. The flow ratio regulating valve is connected to the temperature sensor of the heat dissipation area of ​​the battery pack covered by the corresponding liquid inlet channel and the diversion channel.

[0018] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0019] (1) This utility model sets a central confluence channel in the middle area of ​​the heat dissipation surface of the battery pack. Two inlet channels are used to introduce coolant from the two outer sides of the heat dissipation surface of the battery pack. The coolant flows synchronously from the outer side of the heat dissipation surface of the battery pack to the middle area through several parallel branch channels. The temperature difference of the coolant between the branch channels is small, which can achieve comprehensive and equivalent heat exchange and heat dissipation on the heat dissipation surface of the battery pack. At the same time, the coolant from all branch channels eventually flows into the central confluence channel, increasing the residence time of the coolant in the core heat-generating area of ​​the battery pack and improving the heat exchange efficiency of the middle area of ​​the heat dissipation surface of the battery pack.

[0020] (2) The present invention provides a spiral groove in the middle confluence channel, which can enhance the turbulence effect of the confluence coolant in the channel and enhance the heat exchange efficiency, without significantly increasing the flow resistance of the coolant on the inner wall of the channel.

[0021] (3) The present invention provides a one-way valve at the docking position of the branch flow channel and the intermediate confluence flow channel to ensure that the coolant flows from the branch flow channel to the intermediate confluence flow channel and prevents the problem of coolant confluence caused by multiple intermediate confluence flow channels docking with multiple branch flow channels.

[0022] In summary, the liquid-cooled battery pack and its assembled energy storage cabinet provided by this utility model effectively reduce the temperature difference between different areas of the battery pack by optimizing and improving the structure of the heat dissipation channel of the battery pack. In particular, it can effectively alleviate the abnormally high temperature caused by temperature accumulation in the middle area of ​​the stacked battery pack in the energy storage cabinet, ensuring the consistency of the working temperature of the energy storage cabinet and the battery pack assembled inside, which is conducive to improving the safety of the battery pack and its energy storage equipment.

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the heat dissipation flow channel of the liquid-cooled battery pack in Example 1.

[0025] Figure 2 This is a schematic diagram of the spiral groove on the inner wall of the intermediate confluence channel in Example 1.

[0026] Figure 3 This is a schematic diagram of the heat dissipation flow channel of the liquid-cooled battery pack in Example 2.

[0027] Figure 4 This is a schematic diagram of the liquid inlet and outlet connections of the heat dissipation channels of the multi-layer battery pack in the energy storage cabinet in Example 3.

[0028] The numbers in the diagram are as follows: 100 - battery pack heat dissipation surface, 21 - first liquid inlet channel, 211 - first liquid inlet, 22 - second liquid inlet channel, 221 - second liquid inlet, 23 - intermediate confluence channel, 231 - liquid outlet, 232 - spiral groove, 24 - first branch channel, 25 - second branch channel, 26 - one-way valve, 300 - liquid outlet main pipe, 310 - liquid outlet branch pipe, 400 - liquid inlet main pipe, 410 - liquid inlet branch pipe. Detailed Implementation

[0029] Example 1

[0030] See Figure 1 The figure shows a specific embodiment of the liquid-cooled battery pack of this utility model. Cooling channels for coolant flow are arranged on the heat dissipation surface 100 of the battery pack. These channels include a first inlet channel 21, a second inlet channel 22, a central confluence channel 23, and several branch channels. The heat dissipation surface 100 of the battery pack is rectangular. The central confluence channel 23 is arranged along the centerline of the rectangular surface. The first inlet channel 21 and the second inlet channel 22 are located on both sides of the central confluence channel 23 and are arranged along two parallel sides of the rectangular surface. The inlet channel 21 and the intermediate confluence channel 23, as well as the second inlet channel 22 and the intermediate confluence channel 23, are connected by several parallel branch channels. The first inlet channel 21 and the second inlet channel 22 each have an inlet at one end and are closed at the other end. The intermediate confluence channel 23 has an outlet 231 at one end and is closed at the other end. The heat dissipation channel of the battery pack heat dissipation surface is connected to the coolant heat exchange circulation system through the inlets of the first inlet channel 21 and the second inlet channel 22 and the outlet 231 of the intermediate confluence channel 23.

[0031] In this embodiment, the heat dissipation channel is designed in conjunction with the rectangular geometry of the battery pack heat dissipation surface. The intermediate confluence channel 23 is arranged along the rectangular center line of the battery pack heat dissipation surface 100, that is, the intermediate confluence channel 23 divides the battery pack heat dissipation surface 100 into two small rectangular heat dissipation areas of the same area. The first liquid inlet channel 21 and the second liquid inlet channel 22 are distributed along the two parallel sides of the battery pack heat dissipation surface 100 with the intermediate confluence channel 23 as the line of symmetry and have equal lengths. That is, the first liquid inlet channel 21, the intermediate confluence channel 23 and the second liquid inlet channel 22 are distributed parallel to each other at equal intervals. Then, a plurality of first branch channels 24, connecting the first liquid inlet channel 21 and the intermediate confluence channel 23, are perpendicular to the first liquid inlet channel 21 and the intermediate confluence channel 23. The first branch channels 24 are equidistant and parallel, forming a uniform coverage of the small rectangular heat dissipation area on one side of the battery pack heat dissipation surface. Similarly, a plurality of second branch channels 25, connecting the second liquid inlet channel 22 and the intermediate confluence channel 23, are perpendicular to the second liquid inlet channel 22 and the intermediate confluence channel 23. The second branch channels 25 are also equidistant and parallel, forming a uniform coverage of the small rectangular heat dissipation area on the other side of the battery pack heat dissipation surface. Thus, the first branch channels 24 and the second branch channels 25 form a connected heat dissipation channel between the first liquid inlet channel 21, the second liquid inlet channel 22, and the intermediate confluence channel 23.

[0032] The coolant enters the two sides of the battery pack heat dissipation surface from the first inlet 211 on the first inlet channel 21 and the second inlet 221 on the second inlet channel 22. Then, it flows synchronously through the first branch channel 24 and the second branch channel 25 to the central confluence channel 23 in the middle area of ​​the battery pack. After the coolant quickly fills the first inlet channel 21 and the second inlet channel 22 arranged along the side of the battery pack heat dissipation surface, there will be no large temperature rise. Then, it flows synchronously through multiple branch channels to the middle area of ​​the battery pack heat dissipation surface for heat exchange and cooling. Therefore, the heat exchange efficiency of the battery pack heat dissipation surface is approximately uniform, reducing the probability that the temperature of the coolant will gradually increase due to excessively long cooling channels, resulting in a decrease in heat exchange efficiency. The coolant from all the branch channels eventually flows into the central confluence channel 23, so the coolant flow rate in the central confluence channel 23 is the largest. Although the coolant temperature rises to a certain extent after flowing through the branch channels and exchanging heat, the flow convergence effect of the central confluence channel 23 increases the amount of coolant flowing through the center of the battery pack. The convergence of more coolant allows for heat exchange in the central area of ​​the battery pack's heat dissipation surface, resulting in a better liquid cooling heat exchange effect on the core area of ​​the battery pack and effectively reducing the core temperature of the battery pack.

[0033] In order to stabilize the flow rate of coolant from the two side inlet channels into the branch channels and finally into the middle confluence channel, the cross-sectional dimension of the middle confluence channel 23 must be larger than the cross-sectional dimensions of the first inlet channel 21 and the second inlet channel 22, and the cross-sectional dimensions of the first inlet channel 21 and the second inlet channel 22 must be larger than the cross-sectional dimensions of the branch channels they are connected to.

[0034] like Figure 2 As shown, in this embodiment, a spiral groove 232 is machined on the inner surface of the intermediate confluence channel 23. When the confluenced coolant flows in the intermediate confluence channel 23, a spiral vortex is generated through the spiral groove 232, which accelerates the turbulent mixing of the coolant from multiple branch channels and reduces the turbulence generated when the coolant from multiple branch channels flows into the intermediate confluence channel 23.

[0035] Meanwhile, in order to prevent the coolant that first flows into the intermediate confluence channel 23 from flowing back through other branch channels during its flow, this embodiment also installs a one-way valve 26 at the docking end of each first branch channel 24 and second branch channel 25 with the intermediate confluence channel 23, so that the coolant can only flow unidirectionally from the branch channel to the intermediate confluence channel 23.

[0036] To facilitate the connection of the coolant pipeline in the heat dissipation channel, in this embodiment, the first inlet 211 on the first inlet channel 21, the second inlet 221 on the second inlet channel 22, and the outlet 231 on the intermediate confluence channel 23 are located at the same end.

[0037] Example 2

[0038] Considering that in the heat dissipation channel of Embodiment 1, the coolant has to undergo two 90° flow direction changes from the inlet channel to the branch channel and then to the intermediate confluence channel, which will cause considerable flow resistance to the coolant flow, this embodiment provides another specific implementation scheme of the liquid-cooled battery pack of this utility model.

[0039] Specifically, such as Figure 3As shown, a cooling channel for coolant flow is arranged on the heat dissipation surface 100 of the battery pack. The cooling channel includes a first inlet channel 21, a second inlet channel 22, an intermediate confluence channel 23, and several branch channels. The heat dissipation surface 100 of the battery pack is a rectangular surface. The intermediate confluence channel 23 is arranged along the diagonal of the rectangular surface. The first inlet channel 21 and the second inlet channel 22 are located on both sides of the intermediate confluence channel 23 and are arranged along the two vertical sides of the rectangular surface. The first inlet channel 21 and the intermediate confluence channel 23, as well as the second inlet channel 22 and the intermediate confluence channel 23, are connected by several parallel branch channels. The first inlet channel 21 and the second inlet channel 22 have inlets at their proximal ends relative to the intermediate confluence channel 23 and are closed at their distal ends. The intermediate confluence channel 23 has an outlet 231 at its distal end relative to the first inlet channel 21 and the second inlet channel 22 and is closed at its proximal end.

[0040] In this embodiment, the cooling channels are arranged in the rectangular geometry of the battery pack heat dissipation surface 100. Preferably, the battery pack heat dissipation surface 100 is a square within the rectangle. The intermediate confluence channel 23 is arranged along the diagonal of the rectangular shape of the battery pack heat dissipation surface 100, that is, the intermediate confluence channel 23 divides the battery pack heat dissipation surface 100 into two small triangular heat dissipation areas of equal area. The first liquid inlet channel 21 and the second liquid inlet channel 22 are distributed along the vertical side of the battery pack heat dissipation surface 100 with the intermediate confluence channel 23 as the line of symmetry, and their lengths are equal. That is, the axes of the first liquid inlet channel 21, the intermediate confluence channel 23 and the second liquid inlet channel 22 intersect at one of the corner points of the square. In reality, the first liquid inlet channel 21 and the second liquid inlet channel 22 are staggered and do not directly communicate with each other, and are two independent liquid inlet channels. Then, a plurality of first branch channels 24, connecting the first liquid inlet channel 21 and the intermediate confluence channel 23, are perpendicular to the first liquid inlet channel 21 and are equidistant and parallel, forming a uniform coverage of the small triangular heat dissipation area on one side of the battery pack's heat dissipation surface. Similarly, a plurality of second branch channels 25, connecting the second liquid inlet channel 22 and the intermediate confluence channel 23, are perpendicular to the second liquid inlet channel 22 and are also equidistant and parallel, forming a uniform coverage of the small triangular heat dissipation area on the other side of the battery pack's heat dissipation surface. Thus, the first branch channels 24 and the second branch channels 25 form a connected heat dissipation channel between the first liquid inlet channel 21, the second liquid inlet channel 22, and the intermediate confluence channel 23.

[0041] In this embodiment, the first inlet 211 on the first inlet channel 21 and the second inlet 221 on the second inlet channel 22 are located at the proximal ends of the first inlet channel 21 and the second inlet channel 22 relative to the intermediate confluence channel 23, respectively, with the distal ends closed. Here, "proximal end" and "distal end" refer to the vertical distance from the end of the first inlet channel to the intermediate confluence channel. The outlet 231 on the intermediate confluence channel 23 is located at the distal end relative to the first inlet channel 21 and the second inlet channel 22, with the proximal end closed. Here, "proximal end" and "distal end" refer to the vertical distance from the end of the intermediate confluence channel to the first inlet channel and the second inlet channel. Figure 3 In the middle, the first liquid inlet 211 and the second liquid inlet 221 are located at one end where the three flow channels intersect, while the liquid outlet 231 is located at the other end where the middle confluence flow channel intersects with the two liquid inlet flow channels.

[0042] Since the intermediate confluence channel 23 in this embodiment is arranged diagonally, it increases the flow path length of the coolant in the core heat-generating area of ​​the battery pack. The first branch channel 24 and the second branch channel 25 that converge on it gradually become longer along the outlet direction of the coolant, but at the same time, their flow length in the intermediate confluence channel 23 also gradually shortens. Therefore, overall, the coolant flow path of each branch channel does not produce much difference. The heat dissipation area of ​​the battery pack with a shorter branch channel at the front of the inlet channel can also be assisted in heat dissipation through the inclined intermediate confluence channel 23.

[0043] The difference between the cooling channel arrangement in this embodiment and that in Embodiment 1 is that, along the flow path of the coolant from any inlet to the outlet, a 90° flow direction change occurs only when the coolant flows into the branch channel from the inlet channel. After merging into the intermediate confluence channel from the branch channel, the coolant flows in at an acute angle to the outlet flow direction in the intermediate confluence channel, reducing the flow resistance of the vertical flow direction change. Therefore, the coolant flow field in the intermediate confluence channel is more stable. By increasing the residence time and heat exchange area of ​​the coolant in the core region through the intermediate confluence channel arranged diagonally along the heat dissipation surface of the battery pack, and in conjunction with the optimized flow path, more effective control of the core temperature of the battery pack is achieved.

[0044] Similar to Embodiment 1, this embodiment features a spiral groove 232 machined on the inner surface of the intermediate confluence channel 23. When the flowing coolant flows within the intermediate confluence channel 23, the spiral groove 232 generates a spiral vortex, accelerating the turbulent mixing of the coolant from multiple branch channels and reducing the turbulence generated when coolant from multiple branch channels flows into the intermediate confluence channel 23. Simultaneously, to prevent the coolant that initially flows into the intermediate confluence channel 23 from flowing back through other branch channels, this embodiment also installs a one-way valve 26 at the connection point between each of the first branch channels 24 and the second branch channel 25 and the intermediate confluence channel 23, ensuring that the coolant can only flow unidirectionally from the branch channels to the intermediate confluence channel 23.

[0045] The liquid cooling channels in Embodiment 1 and Embodiment 2 can be machined by milling grooves on the liquid cooling plate, or by laying copper tubes on the liquid cooling plate.

[0046] Example 3

[0047] See Figure 4 The figure shows a specific embodiment of the energy storage cabinet of this utility model. The battery packs stacked in the energy storage cabinet are all liquid-cooled battery packs of Embodiment 1 or Embodiment 2. The inlet and outlet of the heat dissipation channel of each layer of liquid-cooled battery pack are connected to the cooling liquid heat exchange circulation system of the energy storage cabinet. Taking the liquid-cooled battery pack in Embodiment 1 as an example, the first inlet 211 and the second inlet 221 of the heat dissipation surface 100 of each layer of battery pack in the energy storage cabinet are connected in parallel on the same layer of inlet branch pipe 410. The inlet branch pipe 410 of each layer of battery pack is connected in parallel through the inlet main pipe 400. The inlet main pipe 400 is connected to the outlet end of the cooling liquid heat exchange circulation system. The outlet 231 of the heat dissipation surface 100 of each layer of battery pack in the energy storage cabinet is connected in parallel with the outlet main pipe 300 through the outlet branch pipe 310. The outlet main pipe 300 is connected to the return end of the cooling liquid heat exchange circulation system. The cooling channels of the multi-layer liquid-cooled battery pack within the energy storage cabinet are connected in parallel between the outlet and return ends of the coolant heat exchange circulation system via an inlet and outlet header. All interfaces of the piping system utilize quick-release flange connections for easy maintenance. The coolant heat exchange circulation system described in this embodiment utilizes existing liquid-cooling technology for energy storage cabinets. Its outlet end outputs low-temperature coolant after heat exchange cooling, while the return end receives high-temperature coolant after absorbing heat from the battery pack, such as the multi-battery pack energy storage system water-cooled unit and its application energy storage cabinet disclosed in CN222190916U. The specific structure of the coolant heat exchange circulation system will not be described in detail in this embodiment.

[0048] Each liquid-cooled battery pack heat dissipation surface is equipped with a flow proportional regulating valve at its inlet. These valves are connected to temperature sensors in the corresponding inlet / drainage channels covering the battery pack's heat dissipation area. The energy storage cabinet's thermal management system obtains real-time temperatures from the temperature sensors for different heat dissipation areas of the battery pack, compares these temperatures with setpoints, calculates the difference, and compares this difference with a setpoint. If the difference exceeds the setpoint, a PID controller calculates the opening and closing value of the flow proportional regulating valve. This feedback control then adjusts the opening of the flow proportional regulating valve in the corresponding battery pack heat dissipation area's inlet channel, thereby controlling the coolant flow rate.

[0049] This embodiment only describes the liquid cooling heat dissipation channel for cooling the liquid-cooled battery pack. This liquid cooling heat dissipation channel scheme can be used for various modular battery packs in energy storage cabinets. The electrical parts and thermal management system control inside the battery pack and energy storage cabinet are all existing known technologies, and will not be described in detail here.

[0050] In this document, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", and "horizontal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of clarifying the technical solution and for the convenience of description, and therefore should not be construed as limiting the present utility model.

[0051] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0052] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A liquid-cooled battery pack, wherein a heat dissipation channel for coolant flow is arranged on the heat dissipation surface (100) of the battery pack, characterized in that: The heat dissipation channel includes a first liquid inlet channel (21), a second liquid inlet channel (22), an intermediate confluence channel (23), and several branch channels. The heat dissipation surface (100) of the battery pack is a rectangular surface. The intermediate confluence channel (23) is arranged along the center line of the rectangular surface. The first liquid inlet channel (21) and the second liquid inlet channel (22) are located on both sides of the intermediate confluence channel (23) and are arranged along the two parallel sides of the rectangular surface. The first liquid inlet channel (21) and the intermediate confluence channel (23) are connected by several parallel branch channels. The first liquid inlet channel (21) and the second liquid inlet channel (22) are both provided with a liquid inlet at one end and closed at the other end; the intermediate confluence channel (23) is provided with a liquid outlet (231) at one end and closed at the other end.

2. The liquid-cooled battery pack according to claim 1, characterized in that: The inner surface of the intermediate confluence channel (23) is machined with a spiral groove (232).

3. The liquid-cooled battery pack according to claim 1, characterized in that: The first branch channel (24) between the first liquid inlet channel (21) and the intermediate confluence channel (23) is arranged perpendicularly to the first liquid inlet channel (21) at equal intervals; the second branch channel (25) between the second liquid inlet channel (22) and the intermediate confluence channel (23) is arranged perpendicularly to the second liquid inlet channel (22) at equal intervals.

4. The liquid-cooled battery pack according to claim 3, characterized in that: The first diversion channel (24) and the second diversion channel (25) are respectively provided with a one-way valve (26) at the docking end with the intermediate confluence channel (23).

5. A liquid-cooled battery pack, wherein a heat dissipation channel for coolant flow is arranged on the heat dissipation surface (100) of the battery pack, characterized in that: The heat dissipation channel includes a first liquid inlet channel (21), a second liquid inlet channel (22), an intermediate confluence channel (23), and several branch channels. The heat dissipation surface (100) of the battery pack is a rectangular surface. The intermediate confluence channel (23) is arranged along the diagonal of the rectangular surface. The first liquid inlet channel (21) and the second liquid inlet channel (22) are located on both sides of the intermediate confluence channel (23) and are arranged along the two vertical sides of the rectangular surface. The first liquid inlet channel (21) and the intermediate confluence channel (23) are connected by several parallel branch channels. The first liquid inlet channel (21) and the second liquid inlet channel (22) are provided with liquid inlets at the proximal end relative to the intermediate confluence channel (23) and are closed at the distal end; the intermediate confluence channel (23) is provided with an outlet (231) at the distal end relative to the first liquid inlet channel (21) and the second liquid inlet channel (22) and is closed at the proximal end.

6. The liquid-cooled battery pack according to claim 5, characterized in that: The inner surface of the intermediate confluence channel (23) is machined with a spiral groove (232).

7. The liquid-cooled battery pack according to claim 5, characterized in that: The first branch channel (24) between the first liquid inlet channel (21) and the intermediate confluence channel (23) is arranged perpendicularly to the first liquid inlet channel (21) at equal intervals; the second branch channel (25) between the second liquid inlet channel (22) and the intermediate confluence channel (23) is arranged perpendicularly to the second liquid inlet channel (22) at equal intervals.

8. The liquid-cooled battery pack according to claim 7, characterized in that: The first diversion channel (24) and the second diversion channel (25) are respectively provided with a one-way valve (26) at the docking end with the intermediate confluence channel (23).

9. The liquid-cooled battery pack according to any one of claims 5-8, characterized in that: The heat dissipation surface of the battery pack is a square surface.

10. An energy storage cabinet, characterized in that: The battery packs stacked in the energy storage cabinet are all liquid-cooled battery packs as described in any one of claims 1-9. The inlet and outlet of the liquid-cooled battery pack heat dissipation channel are connected to the coolant heat exchange circulation system of the energy storage cabinet. The inlet of the first liquid inlet channel (21) and the second liquid inlet channel (22) of each layer of liquid-cooled battery pack are equipped with a flow ratio regulating valve. The flow ratio regulating valve is connected to the temperature sensor of the heat dissipation area of ​​the battery pack covered by the corresponding liquid inlet channel and the diversion channel.

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