A battery pack and vehicle

Abstract

The application provides a battery pack and a vehicle, wherein the battery pack comprises a frame and a liquid cooling plate; the liquid cooling plate is arranged at the bottom of the frame and forms at least part of a battery cell compartment together with the frame; the liquid cooling plate comprises: a load-bearing plate connected with the frame; at least one liquid cooling unit, the liquid cooling unit comprises at least two liquid cooling pipes connected in series, and is arranged on the side of the load-bearing plate facing the battery cell compartment; at least two cooling liquid ports, the cooling liquid ports are in communication with the liquid inlet end or the liquid outlet end to form a liquid cooling loop passing through the at least one liquid cooling unit. In the foregoing scheme, the independent load-bearing plate and the liquid cooling unit thereon are combined to form the liquid cooling system at the bottom of the battery cell, compared with the prior art, the production cost is easy to control, and the independent maintenance / replacement of each component can be performed. The at least one liquid cooling unit is arranged, and the liquid inlet end and the liquid outlet end of the at least one liquid cooling unit are located on the same side of the load-bearing plate, therefore, only one end of the battery pack needs to be disassembled to maintain / inspect the pipeline connection, and the length of the non-heat exchange part in the liquid cooling loop can be shortened, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] This application pertains to the field of power batteries, and more specifically, relates to a battery pack and a vehicle. Background Technology

[0002] With the rapid development of new energy vehicles, super-fast charging technology is becoming increasingly popular in order to alleviate users' range anxiety and energy replenishment anxiety.

[0003] For battery packs and related components of new energy vehicles, super-fast charging technology inevitably brings the core contradiction that the rate of heat generation far exceeds the heat dissipation capacity. The resulting problems such as high temperature, uneven temperature distribution, material stability challenges, lithium deposition risks, and a sharp increase in the difficulty of safety monitoring make the thermal management system one of the most critical and challenging bottlenecks in achieving safe, reliable, and long-life super-fast charging.

[0004] For prismatic cells in battery packs, conventional technology uses a cold plate at the bottom of the cell for cooling and heat exchange. For CTP architecture, existing technology generally uses a stamped liquid cooling plate or a profile liquid cooling plate for bottom heat exchange. This solution is relatively mature, but it requires non-standard customized molds, extrusion / stamping, and then welding to form a liquid cooling device. Its production cost is relatively high and maintenance is relatively complex. Utility Model Content

[0005] In order to solve or improve the problems in the prior art, the first aspect of this application provides a battery pack, which specifically includes a frame and a liquid cooling plate;

[0006] The liquid cooling plate is located at the bottom of the frame and forms at least part of the cell compartment with the frame;

[0007] Liquid cooling plates include:

[0008] Load-bearing plate, connected to the frame;

[0009] At least one liquid cooling unit, wherein the liquid inlet and liquid outlet of the liquid cooling unit are located at the same end of the load-bearing plate.

[0010] In the aforementioned solution, an independent load-bearing plate and its liquid cooling unit are combined to form a liquid cooling system at the bottom of the battery cell. Compared with existing technologies, this makes it easier to control production costs and allows for independent maintenance / replacement of each component.

[0011] At least one liquid cooling unit is provided, with its inlet and outlet located at the same end of the load-bearing plate. Therefore, only one end of the battery pack housing needs to be disassembled to maintain / inspect the pipeline connection. This also shortens the length of the non-heat exchange part in the liquid cooling circuit and improves heat dissipation efficiency.

[0012] Optionally, the liquid cooling unit includes at least two liquid cooling pipes connected in series.

[0013] Optionally, the liquid cooling unit includes two parallel liquid cooling pipes; the two parallel liquid cooling pipes flow in opposite directions.

[0014] Optionally, at one end of the liquid cooling unit, two liquid cooling pipes are connected, and at the other end of the liquid cooling unit, the two liquid cooling pipes are respectively provided with a liquid inlet or a liquid outlet.

[0015] In the aforementioned scheme, each liquid cooling unit constitutes a liquid cooling branch in the liquid cooling circuit. The two parallel liquid cooling pipes installed therein flow in opposite directions, which can increase the effective length of the liquid cooling branch. Specifically, the effective length of each liquid cooling branch can reach about twice the length of any one of the liquid cooling pipes.

[0016] Optionally, the liquid cooling unit is located on the side of the load-bearing plate facing the cell compartment. Optionally, the load-bearing plate includes:

[0017] At least one cooling zone, within which a liquid cooling unit is located;

[0018] At least two cell support areas are located on both sides of the cooling zone;

[0019] The top surface of the cooling zone is higher than or flush with the top surface of the liquid cooling unit.

[0020] In the aforementioned scheme, the load-bearing plate is divided into a cell support area and a cooling area. The cell support area supports the cell, preventing the liquid cooling unit from being deformed or damaged by the pressure from the cell.

[0021] Optionally, the cell-supporting area includes a protrusion that extends along the length of the liquid-cooling unit. This protrusion not only supports the cell but also acts as a reinforcing rib, enhancing the overall strength of the load-bearing plate.

[0022] In addition, the protrusions can create a space around each liquid cooling unit, which can be filled with a heat-conducting medium to enhance cooling performance.

[0023] Optionally, the wall thickness of the load-bearing plate is 1.2 mm to 2.0 mm.

[0024] Optionally, the liquid cooling pipes can be connected to the load-bearing plate via brazing. This effectively connects the liquid cooling pipes, such as harmonica pipes, to the load-bearing plate, increasing rigidity.

[0025] Optionally, the load-bearing plate is connected to the frame using the FDS process.

[0026] Optionally, in the cooling zone, the periphery of the liquid cooling pipe is filled with a thermally conductive medium and / or a thermally conductive pad is provided.

[0027] Optionally, the liquid cooling plate also includes at least two coolant ports, which are connected to either an inlet or an outlet to form a liquid cooling circuit via at least one liquid cooling unit.

[0028] Optionally, at least two coolant ports include a coolant inlet port and a coolant outlet port;

[0029] Liquid cooling plates also include:

[0030] The coolant inlet manifold has its inlet end connected to the coolant inlet port and its outlet end connected to the inlet end of at least one liquid cooling unit.

[0031] The coolant outlet manifold has its inlet end connected to the outlet end of at least one liquid cooling unit and its outlet end connected to the coolant outlet port.

[0032] The coolant inlet port, coolant outlet port, coolant inlet manifold, coolant outlet manifold, and the inlet and outlet of at least one liquid cooling unit are all located on the same end of the load-bearing plate.

[0033] Optionally, the output end of the coolant inlet manifold is connected to the liquid cooling pipe via a quick-connect interface, and the input end of the coolant outlet manifold is connected to the liquid cooling pipe via a quick-connect interface.

[0034] Optionally, a coolant inlet manifold and / or a coolant outlet manifold connects to the inlet or outlet end of at least one liquid cooling unit from the side away from the load-bearing plate.

[0035] Optionally, the cross-section of the liquid cooling tube perpendicular to its length direction is rectangular, and the liquid cooling tube includes two opposing main surfaces and two opposing side surfaces, with the area of ​​the main surfaces being larger than the area of ​​the side surfaces;

[0036] One of the two main surfaces faces the battery compartment.

[0037] Optionally, the liquid cooling pipe has multiple parallel flow channels inside;

[0038] Multiple parallel flow channels are arranged in a single row along a direction parallel to the main surface.

[0039] Optionally, the nominal thickness of the outer wall of the liquid cooling tube is 0.5 mm.

[0040] Optionally, the liquid cooling pipes can be harmonica tubes. Existing specifications and models of harmonica tubes can be used in series and parallel connections, thus significantly reducing costs compared to existing profile cold-rolled steel / stamped brazed cold-rolled steel solutions.

[0041] Optionally, a bottom guard plate is also included, which is located on the side of the liquid cooling plate away from the frame and is connected to the frame by bolts.

[0042] A second aspect of this application provides a vehicle including the battery pack provided in the first aspect.

[0043] In summary, compared with existing technologies, the aforementioned battery pack and the vehicle using it are easier to control production costs and allow for independent maintenance / replacement of each component. At least one liquid cooling unit has its inlet and outlet located on the same side of the load-bearing plate; therefore, maintenance / inspection of the piping connections can be performed by disassembling only one end of the battery pack housing. This also shortens the length of non-heat exchange sections in the liquid cooling circuit, improving heat dissipation efficiency. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in the embodiments of this application;

[0045] Figure 2 This is a three-dimensional structural diagram of the liquid cooling plate in the battery pack provided in the embodiments of this application;

[0046] Figure 3 yes Figure 2 The partial cross-sectional view of the liquid cooling plate along the A-A' direction is shown in the figure;

[0047] Figure 4 This is a top view of the liquid cooling plate in the battery pack provided in the embodiments of this application;

[0048] Figure 5 This is a schematic diagram showing the dimensions of each part of the load-bearing plate in the battery pack provided in the embodiments of this application;

[0049] Figure 6 This is a schematic diagram of the topology of the range-extended electric vehicle used in the battery pack provided in the embodiments of this application.

[0050] The image is labeled as follows:

[0051] 100: Frame, 200: Liquid cooling plate, 300: Bottom protective plate;

[0052] 210: Load-bearing plate; 220: Liquid cooling unit;

[0053] 211: Cooling zone; 212: Cell support zone; 213: Protrusion.

[0054] 221: Liquid cooling pipe;

[0055] 231: Coolant inlet port; 232: Coolant outlet port;

[0056] 241: Coolant inlet manifold; 242: Coolant outlet manifold. Detailed Implementation

[0057] This application will now be described more fully below with reference to the accompanying drawings. However, this application can be implemented in many different ways and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided herein to make this application more detailed and complete. The same reference numerals denote the same objects throughout the drawings.

[0058] In the description of this application, when a component / structure / pipeline is referred to as being "connected to" other components / structures / pipelines, such as "connected to" other components / structures / pipelines, the component / structure / pipeline may be directly connected to or directly coupled to other components / structures / pipelines, or there may be an intervening third component / structure / pipeline; in addition, in the embodiments of this application, "connection" may be a mechanical structural connection or a fluid-tight connection between pipes.

[0059] This document describes embodiments with reference to cross-sectional views as idealized implementations. Thus, variations in shape relative to the illustrations are anticipated as a result of, for example, manufacturing techniques and / or tolerances. Therefore, the embodiments described herein should not be construed as limited to the specific shapes of the regions shown herein, but should include deviations in shape due to, for example, manufacturing processes. For example, regions shown or described as flat may typically have rough and / or non-linear characteristics. Furthermore, acute angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to show precise shapes of the regions and are not intended to limit the scope of the claims.

[0060] In the embodiments of this application, nominal dimensions, such as nominal thickness, are used to describe the structure; it should be understood that the nominal dimension is the nominal value or theoretical target value of the structure, and the actual dimension of the structure is an unavoidable tolerance that conforms to a predetermined standard based on the nominal dimension.

[0061] This application provides a battery pack, the overall structure of which is as follows: Figure 1 As shown, it includes a frame 100 and a liquid cooling plate 200.

[0062] A liquid cooling plate 200 is disposed at the bottom of the frame 100 and forms at least part of the cell compartment with the frame 100, the cell compartment being used to place and secure the cells in the battery pack. Typically, the cells used in this embodiment are prismatic cells.

[0063] like Figure 2 As shown, the liquid cooling plate 200 includes:

[0064] The load-bearing plate 210 is connected to the frame 100;

[0065] At least one liquid cooling unit 220, wherein the liquid inlet and liquid outlet of the liquid cooling unit 220 are located on the same side of the load-bearing plate 210.

[0066] In a typical embodiment, such as Figure 2 As shown, five liquid cooling units 220 are provided on the load-bearing plate 210. These five liquid cooling units 220 are connected in parallel to form five liquid cooling circuits.

[0067] In the aforementioned embodiment, the liquid inlet and outlet ends of the five liquid cooling units 220 are all located on the same side of the load-bearing plate 210, that is... Figure 4 On the left side of the middle.

[0068] In the aforementioned solution, an independent load-bearing plate and its liquid cooling unit are combined to form a liquid cooling system at the bottom of the battery cell. Compared with existing technologies, this makes it easier to control production costs and allows for independent maintenance / replacement of each component.

[0069] At least one liquid cooling unit is provided, with its inlet and outlet located on the same side of the load-bearing plate. Therefore, only one end of the battery pack needs to be disassembled to maintain / inspect the pipeline connection, which can also shorten the length of the non-heat exchange part in the liquid cooling circuit and improve heat dissipation efficiency.

[0070] In a typical embodiment, the liquid cooling unit 220 includes at least two liquid cooling pipes 221 connected in series.

[0071] In a preferred embodiment, such as Figure 2 or Figure 4 As shown, the liquid cooling unit 220 includes two parallel liquid cooling pipes 221;

[0072] like Figure 4 As shown, at one end of the liquid cooling unit 220 (e.g. Figure 4 At the right end of the middle section, two liquid cooling pipes 221 are connected, and at the other end of the liquid cooling unit 220 (e.g., at the right end), two liquid cooling pipes 221 are connected. Figure 4 (at the left end of the middle), the two liquid cooling pipes 221 are respectively provided with the aforementioned liquid inlet or liquid outlet;

[0073] The two parallel liquid cooling pipes flow in opposite directions.

[0074] In this embodiment, each liquid cooling unit constitutes a liquid cooling branch in the liquid cooling circuit. The two parallel liquid cooling pipes arranged therein flow in opposite directions, which can increase the effective length of the liquid cooling branch. Specifically, the effective length of each liquid cooling branch can reach about twice the length of any one of the liquid cooling pipes.

[0075] In a typical embodiment, one end of the two parallel liquid cooling pipes, i.e. Figure 4 One end on the right side of the middle section is connected by a connecting device, such as a quick connector, and is defined as the connecting end. Preferably, it connects two parallel liquid cooling pipes from above, i.e., from the side away from the load-bearing plate, so that the connecting end is easy to maintain.

[0076] In alternative embodiments, such as Figure 4 As shown, the connecting ends of two liquid cooling pipes in the same group (i.e. Figure 4 (At the right end of the middle), extending out from the edge of the load-bearing plate.

[0077] In a preferred embodiment, for two liquid cooling pipes in the same group, the end of one liquid cooling pipe away from the aforementioned connecting end serves as the liquid inlet of the liquid cooling unit, and the end of the other liquid cooling pipe away from the aforementioned connecting end serves as the liquid outlet of the liquid cooling unit. More preferably, both the liquid inlet and the liquid outlet are located above the liquid cooling pipes, i.e., on the side away from the load-bearing plate.

[0078] In a typical embodiment, the liquid cooling unit 220 is disposed on the side of the load-bearing plate 210 facing the cell compartment.

[0079] In a preferred embodiment, such as Figure 3 As shown, the load-bearing plate 210 includes:

[0080] At least one cooling zone 211, and a liquid cooling unit 220 is disposed within the cooling zone 211;

[0081] At least two cell support areas 212 are disposed on both sides of the cooling area 211;

[0082] The top surface of the cooling zone 211 is higher than or flush with the top surface of the liquid cooling pipe 221.

[0083] In a preferred embodiment, such as Figure 4 As shown, the cell support area 212 and the cooling area 211 are alternately arranged along a direction perpendicular to the long axis of the liquid cooling pipe.

[0084] In a preferred embodiment, such as Figure 4 As shown, it includes five cooling zones 211 equipped with liquid cooling units 220, and six cell carrying zones 212, which are respectively arranged on both sides of each cooling zone 211.

[0085] In the aforementioned embodiments, the load-bearing plate is divided into a cell support area and a cooling area. The cell support area supports the cell, preventing the liquid cooling unit from being deformed or damaged by the pressure from the cell.

[0086] In a preferred embodiment, such as Figure 4 As shown, the cell support area 212 also includes a protrusion 213, which extends along the length of the liquid cooling unit 220. The protrusion not only supports the cell but also acts as a reinforcing rib, enhancing the overall strength of the support plate. Furthermore, the protrusion forms a semi-enclosed space around each liquid cooling unit, which can be filled with a heat-conducting medium to enhance cooling performance.

[0087] In a preferred embodiment, the wall thickness of the load-bearing plate 210 is 1.2 mm to 2.0 mm.

[0088] In a typical embodiment, such as Figure 5 As shown, there is a rounded corner between the cooling zone and the cell support zone. This rounded corner is usually derived from the stamping process during the processing of the load-bearing plate.

[0089] like Figure 5 As shown, area A is the width of the battery cell it supports, area B is the width of the cooling area, C is the width of the liquid cooling pipe, D is the gap distance between the liquid cooling pipes, and E is the contact width between the battery cell and the battery cell support area. The principle for confirming each dimension is: confirm the width of A through structural simulation, confirm the width of C through thermal management simulation, and the relationship between them is: 2C+D+2R=B, where R is the stamping angle radius of the load-bearing plate, and B+2*E=A.

[0090] The principle for confirming the height difference between the upper surface of the cooling zone and the upper surface of the cell bearing zone is: it needs to be compatible with the flatness of the bottom of the module and its own flatness, and exchange heat with the cell through thermally conductive adhesive / thermally conductive silicone pad.

[0091] In an optional embodiment, the liquid cooling pipe 221 is connected to the load-bearing plate 210 by brazing. This effectively connects the liquid cooling pipe, such as a harmonica pipe, to the load-bearing plate, thereby improving rigidity.

[0092] In an alternative embodiment, the load-bearing plate is connected to the frame via FDS process.

[0093] In alternative embodiments, such as Figure 1 As shown, a partition is provided inside the frame 100, and the partition is perpendicular to the extension direction of the liquid cooling pipe. The partition divides the inside of the frame 100 into multiple cell compartments, and each cell compartment is arranged along the extension direction of the liquid cooling pipe.

[0094] In an optional embodiment, the periphery of the liquid cooling pipe 221 in the cooling zone 211 is filled with a thermally conductive medium and / or a thermally conductive pad (not shown in the figures) is provided.

[0095] In a typical embodiment, such as Figure 2 As shown, at least two coolant ports include a coolant inlet port 231 and a coolant outlet port 232; each liquid cooling unit 220 is connected in parallel between the coolant inlet port 231 and the coolant outlet port 232.

[0096] In a typical embodiment, the liquid cooling plate 200 further includes at least two coolant ports connected to an inlet or outlet to form a liquid cooling circuit via at least one liquid cooling unit 220.

[0097] like Figure 2 or Figure 4 As shown, the liquid cooling plate 200 also includes:

[0098] The coolant inlet manifold 241 has an inlet end connected to the coolant inlet port 231 and an outlet end connected to the inlet end of at least one liquid cooling unit 220.

[0099] The coolant output manifold 242 has its input end connected to the outlet end of at least one liquid cooling unit 220, and its output end connected to the coolant output port 232.

[0100] The coolant inlet port 231, coolant outlet port 232, coolant inlet manifold 241, coolant outlet manifold 242, and at least one liquid cooling unit 220 are all located on the same side of the load-bearing plate 210.

[0101] Typically, the coolant inlet manifold 241 includes an inlet and a tree-like arrangement of multiple outlets.

[0102] Typically, the coolant outlet manifold 242 includes a tree-like arrangement of multiple inlets and one outlet.

[0103] In the aforementioned embodiment, the coolant inlet port 231, coolant outlet port 232, coolant inlet manifold 241, coolant outlet manifold 242, and the inlet and outlet ends of at least one liquid cooling unit 220 are all located on the same side of the load-bearing plate 210. In other words, the non-heat exchange portion of the piping, i.e., the portion of the piping that does not contact the battery cell to cool it, is entirely located on the same side of the load-bearing plate 210, for example... Figure 4 On the left side, the liquid cooling system piping can be adjusted, repaired, or maintained by disassembling only part of the casing without removing the battery cells. Alternatively, after disconnecting the coolant inlet manifold 241 and coolant outlet manifold 242, the liquid cooling pipes (groups) to be replaced can be moved from... Figure 4 Pull it out from the left or right side.

[0104] In a preferred embodiment, the coolant inlet manifold and / or coolant outlet manifold are connected from the side of at least one liquid cooling unit 220 away from the load-bearing plate 210 to the inlet or outlet end, which facilitates installation and maintenance.

[0105] In a preferred embodiment, such as Figure 3 As shown, the liquid cooling pipe 221 has a rectangular cross-section perpendicular to its length direction. The liquid cooling pipe 221 includes two opposing main surfaces and two opposing side surfaces. The area of ​​the main surfaces is larger than the area of ​​the side surfaces. One of the two main surfaces faces the cell compartment and is used to contact the cell directly or through a heat-conducting medium for heat exchange and cooling of the cell.

[0106] In an embodiment, such as Figure 3 As shown, the liquid cooling tube 221 has multiple parallel flow channels inside; the multiple parallel flow channels are arranged in a single row along a direction parallel to the main surface.

[0107] In a preferred embodiment, the nominal thickness of the outer wall of the liquid cooling pipe 221 is 0.5 mm.

[0108] In a preferred embodiment, the liquid cooling pipe 221 is an existing harmonica pipe.

[0109] In a preferred embodiment, such as Figure 1 As shown, it also includes a bottom protective plate 300, which is disposed on the side of the liquid cooling plate 200 away from the frame 100 and is connected to the frame 100 by bolts.

[0110] This application also provides a vehicle including a battery pack as provided in any of the foregoing embodiments.

[0111] The aforementioned vehicles are preferably range-extended electric vehicles.

[0112] In order to make this application more fully public, the following is an explanatory description of range-extended new energy vehicles.

[0113] Range-extended electric vehicles have the following topology: Figure 6 As shown.

[0114] The core component of a range-extended electric vehicle is the range extender. Its main function is to activate the range extender when the battery charge drops to a certain level, causing the engine to drive a generator to produce electricity. Part of the generated electricity can be used to power the drive motor, and the other part can be used to charge the battery.

[0115] Range-extended electric vehicles (REEVs) have many advantages. For example, in daily urban commuting, REEVs can be driven purely on electricity, achieving zero emissions, reducing exhaust pollution, and meeting environmental protection requirements. They are also more energy-efficient than fuel-powered vehicles, reducing energy consumption and operating costs. REEVs are equipped with an engine as a range extender. When the battery is low, the engine can start to generate electricity, providing continuous power to the vehicle. This avoids the range anxiety problem caused by the limited range of pure electric vehicles, making long-distance travel more convenient.

[0116] Furthermore, range-extended electric vehicles (REEVs) offer numerous advantages in terms of driving experience. Essentially, a REEV is a pure electric drive system where the vehicle's power comes entirely from the electric motor. The engine does not directly drive the vehicle but instead acts as a generator, starting when the battery is low to convert fuel into electricity to power the electric motor or charge the battery. This pure electric drive method ensures a single and pure power source, consistent with the driving mechanism of pure electric vehicles, fundamentally guaranteeing a comfortable driving experience.

[0117] On the other hand, the characteristics of electric motors determine that they can output maximum torque instantly. In range-extended electric vehicles, when the driver presses the accelerator pedal, the electric motor can respond quickly and output powerful force to achieve rapid start and acceleration. This instantaneous power response is far superior to that of traditional fuel vehicles, allowing the driver to feel a more direct and rapid push-back feeling. Whether it is in the frequent start-stop of urban roads or overtaking operations on highways, it can easily cope with the situation and bring a smooth driving experience.

[0118] On the other hand, during the driving process of a range-extended vehicle, since it is always driven by an electric motor, there is no power interruption problem when shifting gears as in traditional fuel vehicles. Whether driving at low speed or high speed, the power output remains continuous and stable. Even when the battery is low, during the process of the engine starting to generate electricity, the system can ensure that the power output of the electric motor is not affected through a precise control strategy, without any jerking or power interruption. This provides the driver with a consistently stable driving experience, improving driving comfort and safety.

[0119] In summary, compared with existing technologies, the aforementioned battery pack and the vehicle using it are easier to control production costs and allow for independent maintenance / replacement of each component. At least one liquid cooling unit has its inlet and outlet located on the same side of the load-bearing plate; therefore, maintenance / inspection of the piping connections can be performed by disassembling only one end of the battery pack housing. This also shortens the length of non-heat exchange sections in the liquid cooling circuit, improving heat dissipation efficiency.

[0120] The above description is only a partial embodiment of this application, but the scope of protection of this application 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 the embodiments of this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, Includes a frame (100) and a liquid cooling plate (200); The liquid cooling plate (200) is disposed at the bottom of the frame (100) and together with the frame (100) constitutes at least part of the cell compartment; The liquid cooling plate (200) includes: A load-bearing plate (210) is connected to the frame (100); At least one liquid cooling unit (220), wherein the liquid inlet and liquid outlet of the at least one liquid cooling unit (220) are located at the same end of the load-bearing plate (210).

2. The battery pack according to claim 1, characterized in that, The liquid cooling unit (220) includes at least two liquid cooling pipes (221) connected in series.

3. The battery pack according to claim 2, characterized in that, The liquid cooling unit (220) includes two parallel liquid cooling pipes (221) with opposite flow directions.

4. The battery pack according to claim 3, characterized in that, At one end of the liquid cooling unit (220), the two parallel liquid cooling pipes (221) are connected, and at the other end of the liquid cooling unit (220), the two parallel liquid cooling pipes (221) are respectively provided with the liquid inlet end or the liquid outlet end.

5. The battery pack according to any one of claims 1 to 4, characterized in that, The liquid cooling unit (220) is located on the side of the load-bearing plate (210) facing the cell compartment.

6. The battery pack according to claim 5, characterized in that, The load-bearing plate (210) includes: At least one cooling zone (211), wherein the liquid cooling unit (220) is disposed within the cooling zone (211); At least two cell support areas (212) are disposed on both sides of the cooling area (211); The top surface of the cooling zone (211) is higher than or flush with the top surface of the liquid cooling unit (220).

7. The battery pack according to claim 6, characterized in that, The cell support area (212) includes a protrusion (213) that extends along the length of the liquid cooling unit (220).

8. The battery pack according to claim 7, characterized in that, The wall thickness of the load-bearing plate (210) is 1.2 mm to 2.0 mm.

9. The battery pack according to any one of claims 6 to 8, characterized in that, The liquid cooling unit (220) includes a liquid cooling pipe (221), which is connected to the load-bearing plate (210) by brazing.

10. The battery pack according to any one of claims 6 to 8, characterized in that, The liquid cooling unit (220) includes a liquid cooling pipe (221); in the cooling zone (211), the periphery of the liquid cooling pipe (221) is filled with a thermally conductive medium and / or a thermally conductive pad is provided.

11. The battery pack according to any one of claims 1 to 4, characterized in that, The liquid cooling plate (200) also includes at least two coolant ports, which are connected to the inlet or outlet to form a liquid cooling circuit via the at least one liquid cooling unit (220).

12. The battery pack according to claim 11, characterized in that, The at least two coolant ports include a coolant inlet port (231) and a coolant outlet port (232). The liquid cooling plate (200) also includes: A coolant inlet manifold (241) is provided, with its inlet end connected to the coolant inlet port (231) and its outlet end connected to the inlet end of the at least one liquid cooling unit (220). A coolant output manifold (242) is provided, with its input end connected to the outlet end of the at least one liquid cooling unit (220) and its output end connected to the coolant output port (232). The coolant inlet port (231), coolant outlet port (232), coolant inlet manifold (241), coolant outlet manifold (242), and the inlet and outlet of the at least one liquid cooling unit (220) are all located on the same end of the load-bearing plate (210).

13. The battery pack according to claim 12, characterized in that, The coolant inlet manifold and / or coolant outlet manifold connect from the side of the at least one liquid cooling unit (220) away from the load-bearing plate (210) to the inlet or outlet end.

14. The battery pack according to any one of claims 2 to 4, characterized in that, The liquid cooling tube (221) has a rectangular cross-section perpendicular to its length direction. The liquid cooling tube (221) includes two opposing main surfaces and two opposing side surfaces. The area of ​​the main surfaces is greater than the area of ​​the side surfaces. One of the two main surfaces faces the battery cell compartment.

15. The battery pack according to claim 14, characterized in that, The liquid cooling pipe (221) has multiple parallel flow channels inside; The plurality of parallel flow channels are arranged in a single row along a direction parallel to the main surface.

16. The battery pack according to claim 14, characterized in that, The nominal thickness of the outer wall of the liquid cooling pipe (221) is 0.5 mm.

17. The battery pack according to claim 14, characterized in that, The liquid cooling pipe (221) is a harmonica pipe.

18. The battery pack according to any one of claims 1 to 4, characterized in that, It also includes a bottom guard plate (300), which is disposed on the side of the liquid cooling plate (200) away from the frame (100) and is connected to the frame (100) by bolts.

19. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 1 to 18.

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