Battery box and battery pack

Abstract

The utility model discloses a battery box and battery pack, including battery box for installing monomer battery, monomer battery includes adjacent pole post end and circumference lateral wall, including: liquid cooling subassembly and circulation pipeline, liquid cooling subassembly includes first liquid cooling board and second liquid cooling board, and first liquid cooling board is set with first flow channel, and first liquid cooling board is connected with pole post end, and second liquid cooling board is set with second flow channel, and second liquid cooling board is connected with circumference lateral wall, circulation pipeline connects first liquid cooling board, and with first flow channel intercommunication, and circulation pipeline connects second liquid cooling board, and with second flow channel intercommunication. The utility model lies in solve the technical problem that the temperature consistency between different areas in battery pack is poor.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery box and battery pack. Background Technology

[0002] The rapid development of new energy vehicles and energy storage systems has placed higher demands on the energy density, safety, and thermal management performance of battery systems. Among them, cylindrical batteries are gradually becoming the mainstream choice for next-generation high-performance lithium battery systems due to their advantages such as high energy density per unit volume, good structural safety, and controllable manufacturing costs.

[0003] However, cylindrical battery systems release a significant amount of heat during high-rate charging and discharging or prolonged operation, primarily due to Joule heating and polarization heat generated by internal electrochemical reactions. If this heat cannot be effectively dissipated in a timely manner, it will lead to an abnormal increase in cell temperature, causing a series of problems such as thermal runaway, cell performance degradation, and shortened cycle life, and may even result in serious safety accidents. Therefore, efficient thermal management of large cylindrical battery systems has become a key technical aspect for ensuring their stable operation.

[0004] Current conventional thermal management solutions mostly employ liquid cooling systems, which involve placing liquid cooling plates on the top or side of large cylindrical battery modules to circulate coolant and remove heat. However, existing solutions still have significant drawbacks: the top liquid cooling plate needs to be designed to fit the battery array arrangement, requiring the integration of complex flow channel structures and coolant piping. This can easily lead to problems such as excessive local flow resistance and uneven coolant distribution, resulting in poor temperature uniformity between different areas within the battery pack, reduced thermal management efficiency, and further exacerbation of uneven thermal stress between cells, affecting the overall pack consistency and safety. Utility Model Content

[0005] One objective of this invention is to provide a battery housing and battery pack that addresses the technical problem of poor temperature uniformity between different areas within the battery pack.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a solution as follows: a battery housing for mounting individual batteries, each battery comprising adjacent terminal ends and peripheral sidewalls, characterized in that it includes:

[0007] The liquid cooling assembly includes a first liquid cooling plate and a second liquid cooling plate. The first liquid cooling plate has a first flow channel and is connected to the electrode end. The second liquid cooling plate has a second flow channel and is connected to the peripheral sidewall.

[0008] The circulation pipeline is connected to the first liquid cooling plate and communicates with the first flow channel. The circulation pipeline is also connected to the second liquid cooling plate and communicates with the second flow channel.

[0009] Optionally, the liquid cooling assembly includes a plurality of second liquid cooling plates, which are respectively disposed on both sides of the first liquid cooling plate.

[0010] Optionally, there are multiple liquid cooling components, which are spaced apart.

[0011] The circulation pipeline includes a main pipe and multiple branch pipes. Multiple first liquid cooling plates are connected to the main pipe, multiple first flow channels are connected to the main pipe and are connected in parallel, the branch pipes are connected to the second liquid cooling plates, and the second flow channels are connected to the main pipe through the branch pipes.

[0012] Optionally, each side of the first liquid cooling plate is provided with a plurality of mutually spaced second liquid cooling plates, and the plurality of second liquid cooling plates located on the same side of the first liquid cooling plate are connected in series through branch pipes.

[0013] Optionally, the opposite side walls of the second liquid cooling plate are respectively provided with a first groove and a second groove, the first groove and the second groove are staggered, and a single battery is inserted into the first groove or the second groove, with at least part of the peripheral side wall being in contact with the inner wall of the first groove or the inner wall of the second groove.

[0014] Optionally, the branch pipe is a flexible pipe, which includes a connecting part and an extension part. The two ends of the extension part are connected to the connecting part. One of the connecting parts is connected to the second liquid cooling plate, and the other connecting part is connected to the main pipe. The extension part is corrugated.

[0015] Optionally, the battery housing includes a first thermally conductive layer and a second thermally conductive layer. The first thermally conductive layer is disposed on the first liquid cooling plate for contact with the terminal end, and the second thermally conductive layer is disposed on the second liquid cooling plate for contact with the peripheral sidewall.

[0016] Optionally, the first liquid cooling plate has a first flow channel, a water inlet, a water outlet and a flow guide cavity. One end of the flow guide cavity has a water inlet and a water outlet, and the other end of the flow guide cavity has a first flow channel. The circulation pipeline is connected to the flow guide cavity through the water inlet and the water outlet.

[0017] Optionally, the first flow channel includes a first section, a plurality of spaced second sections and a plurality of spaced third sections. One end of the plurality of second sections is connected to the area of ​​the guide cavity near the inlet, one end of the plurality of second sections is connected to the first section, one end of the plurality of third sections is connected to the area of ​​the guide cavity near the outlet, and one end of the plurality of third sections is connected to the first section.

[0018] Optionally, the second flow channel includes a fourth section, a plurality of spaced fifth sections and a plurality of spaced sixth sections. The fourth section is located at the end of the second liquid cooling plate away from the circulation pipeline. One end of the plurality of fifth sections is connected to the fourth section and the other end is connected to the circulation pipeline. One end of the plurality of sixth sections is connected to the fourth section and the other end is connected to the circulation pipeline.

[0019] Secondly, this application provides a battery pack, including a single battery cell and the aforementioned battery housing, wherein the single battery cell is installed inside the battery housing.

[0020] The beneficial effects of this utility model are as follows:

[0021] A battery housing for mounting individual batteries, each battery including adjacent terminal ends and peripheral sidewalls, includes a liquid cooling assembly and a circulation pipeline. The liquid cooling assembly includes a first liquid cooling plate and a second liquid cooling plate. The first liquid cooling plate has a first flow channel and is connected to the terminal ends. The second liquid cooling plate has a second flow channel and is connected to the peripheral sidewalls. The circulation pipeline is connected to the first liquid cooling plate and communicates with the first flow channel. The circulation pipeline is also connected to the second liquid cooling plate and communicates with the second flow channel.

[0022] In practical applications, the battery housing provided in this application constructs a "double-sided cooling" structure by setting a first liquid cooling plate and a second liquid cooling plate at the terminal end and peripheral sidewall of each individual cell, respectively, enabling the cell to have efficient heat dissipation paths in both the longitudinal and radial directions. The first liquid cooling plate is directly connected to the terminal end, which can quickly dissipate the Joule heat generated in the current collection area of ​​the cell; the second liquid cooling plate is connected to the peripheral sidewall, effectively covering the heat conduction path on the side of the cell and increasing the overall heat exchange area. The circulation pipeline is connected to the first flow channel of the first liquid cooling plate and the second flow channel of the second liquid cooling plate, respectively, ensuring that the coolant can flow independently or in series in the two liquid cooling plates, forming a continuous and stable heat dissipation loop. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model;

[0025] Figure 2 This is a front view of the liquid cooling assembly and circulation pipeline provided in this embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the liquid cooling assembly and circulation pipeline provided in this embodiment of the utility model;

[0027] Figure 4 This is provided by the embodiment of the present utility model. Figure 3 A magnified view of a portion of region A in the middle;

[0028] Figure 5This is a structural schematic diagram of the first liquid cooling plate provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the first flow channel provided in this embodiment of the utility model;

[0030] Figure 7 This is a structural schematic diagram of the second liquid cooling plate provided in an embodiment of the present invention.

[0031] Explanation of icon numbers:

[0032] 20. Liquid cooling assembly; 21. First liquid cooling plate; 211. First flow channel; 2111. First section; 2112. Second section; 2113. Third section; 212. Inlet; 213. Outlet; 214. Guide cavity; 22. Second liquid cooling plate; 221. First tank; 222. Second tank; 223. Second flow channel; 2231. Fourth section; 2232. Fifth section; 2233. Sixth section; 30. Circulation pipeline; 31. Main pipe; 32. Branch pipe; 321. Connecting part; 322. Extension part; 40. Single cell; 41. Peripheral sidewall; 42. Terminal end. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model. Figure 2 This is a front view of the liquid cooling assembly 20 and the circulation pipeline 30 provided in this embodiment of the utility model.

[0035] This utility model provides a battery pack, which includes a single battery cell 40 and a battery housing, with the single battery cell 40 installed inside the battery housing.

[0036] Specifically, the battery housing is used to install individual battery cells 40. Each individual battery cell 40 includes adjacent terminal ends 42 and peripheral sidewalls 41. The housing includes a liquid cooling assembly 20 and a circulation pipe 30. The liquid cooling assembly 20 includes a first liquid cooling plate 21 and a second liquid cooling plate 22. The first liquid cooling plate 21 has a first flow channel 211 and is connected to the terminal ends 42. The second liquid cooling plate 22 has a second flow channel 223 and is connected to the peripheral sidewalls 41. The circulation pipe 30 is connected to the first liquid cooling plate 21 and communicates with the first flow channel 211. The circulation pipe 30 is also connected to the second liquid cooling plate 22 and communicates with the second flow channel 223.

[0037] In practical applications, the battery housing provided in this application constructs a "double-sided cooling" structure by setting a first liquid cooling plate 21 and a second liquid cooling plate 22 on the terminal end 42 and peripheral sidewall 41 of the individual battery cell 40, respectively, so that the battery cell has an efficient heat dissipation path in both the longitudinal and radial directions. The first liquid cooling plate 21 is directly connected to the terminal end 42, which can quickly dissipate the Joule heat generated in the current collection area of ​​the battery cell; the second liquid cooling plate 22 is connected to the peripheral sidewall 41, which effectively covers the heat conduction path on the side of the battery cell and increases the overall heat exchange area. The circulation pipe 30 is connected to the first flow channel 211 of the first liquid cooling plate 21 and the second flow channel 223 of the second liquid cooling plate 22, respectively, to ensure that the coolant can flow independently or in series in the two liquid cooling plates, forming a continuous and stable heat dissipation circuit.

[0038] This structure breaks through the traditional single-sided cooling method where liquid cooling plates are only placed on the top or side, significantly improving the cooling coverage and heat flow conduction capacity. It effectively avoids uneven cell temperature rise caused by insufficient local cooling, thereby enhancing the thermal uniformity of the entire battery pack. By synergistically arranging the liquid cooling structure in the high heat flux region (terminal end 42) and the large heat dissipation region (peripheral sidewall 41), the cell temperature can be maintained under harsh conditions such as high-rate charging and discharging, extending its cycle life, reducing the risk of thermal runaway, and improving the safety and reliability of the entire battery pack. It is especially suitable for power batteries or energy storage systems using high-energy-density large cylindrical cells.

[0039] Furthermore, in this application, the cylindrical batteries are arranged horizontally inside the battery pack. Compared to the arrangement of cylindrical batteries vertically inside the battery pack in related technologies, this application can reduce the thickness of the battery pack while maintaining heat dissipation, thereby improving the applicability of the battery pack.

[0040] In this embodiment, the first liquid cooling plate 21 and the second liquid cooling plate 22 are arranged perpendicularly to each other, wherein the thickness direction of the first liquid cooling plate 21 is the width direction of the battery pack. The individual battery 40 is fixed to the first liquid cooling plate 21 and the second liquid cooling plate 22 by adhesive bonding. The battery box is filled with expanding foam. The liquid cooling assembly 20, the circulation pipe 30 and the individual battery 40 are fixed to the inside of the battery box by expanding foam. The circulation pipe 30 can be connected to the battery box by bolts.

[0041] In one embodiment, see Figure 2 The liquid cooling assembly 20 includes a plurality of second liquid cooling plates 22, which are respectively disposed on both sides of the first liquid cooling plate 21.

[0042] In practical applications, this application arranges multiple second liquid cooling plates 22 on both sides of the first liquid cooling plate 21 in the thickness direction, placing the first liquid cooling plate 21 between multiple individual cells 40. This ensures that both its side walls are connected to the terminal ends 42 of the individual cells 40, thus constructing a "double-sided heat dissipation + sandwich" structural arrangement. Since the first liquid cooling plate 21 undertakes the main task of dissipating Joule heat from the cell terminal ends 42, it has a first flow channel 211 inside, which can efficiently dissipate heat. By simultaneously arranging cells on opposite sides and providing second liquid cooling plates 22 on the peripheral sidewalls 41 of each cell, each cell can simultaneously benefit from the heat exchange channels from the terminal ends 42 and the peripheral sidewalls 41, effectively expanding the cooling path and improving the heat exchange efficiency of the unit liquid cooling plate.

[0043] Compared to traditional single-sided liquid cooling or single-row arrangement, this structure can accommodate more cells within the same housing volume, while fully utilizing the cooling potential of the first liquid cooling plate 21 and avoiding limited heat dissipation in areas with concentrated heat sources. The sandwich arrangement improves the thermal load utilization efficiency of the liquid cooling plate and increases the service density of the cooling system for multiple cells without increasing the complexity of the circulation piping 30. This significantly optimizes the internal thermal field distribution of the battery pack, further improving overall temperature consistency, heat dissipation efficiency, and structural integration, making it suitable for high-density stacking applications of large cylindrical cells.

[0044] In other embodiments of this application, the second liquid cooling plate 22 may be provided only on one side of the first liquid cooling plate 21, and the individual cells 40 may be provided on one side of the first liquid cooling plate 21. This can further reduce the width of the battery pack, enabling the battery pack to be applied to narrower application scenarios.

[0045] Further, see Figure 2 The number of liquid cooling components 20 is multiple, and the multiple liquid cooling components 20 are arranged at intervals;

[0046] The circulation pipeline 30 includes a main pipe 31 and multiple branch pipes 32. Multiple first liquid cooling plates 21 are connected to the main pipe 31. Multiple first flow channels 211 are connected to the main pipe 31 and are connected in parallel. The branch pipes 32 are connected to the second liquid cooling plates 22. The second flow channels 223 are connected to the main pipe 31 through the branch pipes 32.

[0047] In practical applications, this application sets multiple liquid cooling components 20 and arranges them at intervals. Combined with the circulation pipeline 30 structure formed by the main pipe 31 and branch pipes 32, the entire liquid cooling system has the ability to be modularly arranged in parallel, which significantly enhances the fluid control capability and structural flexibility of the cooling system. Specifically, multiple first liquid cooling plates 21 are connected in parallel to the main pipe 31 and are connected to the main pipe 31 through the first flow channel 211, so that coolant can be injected into each first liquid cooling plate 21 simultaneously to achieve balanced cooling of multiple cell electrode terminals 42; while multiple second liquid cooling plates 22 are connected to the main pipe 31 through branch pipes 32 and are connected to the branch pipes 32 through the second flow channel 223, ensuring that the second liquid cooling plates 22 arranged on the peripheral sidewalls 41 of the cell also receive a stable supply of coolant.

[0048] Further, see Figure 3 and Figure 4 Each side of the first liquid cooling plate 21 is provided with a plurality of second liquid cooling plates 22 spaced apart from each other, and the plurality of second liquid cooling plates 22 located on the same side of the first liquid cooling plate 21 are connected in series through branch pipes 32.

[0049] In practical applications, a single cell 40 can be positioned between two adjacent second liquid cooling plates 22, or on one side of a second liquid cooling plate 22. A single cell 40 positioned between two adjacent second liquid cooling plates 22 can dissipate heat through the two second liquid cooling plates 22, thereby further improving heat dissipation efficiency. This application constructs an extended lateral cooling channel by setting multiple spaced-apart second liquid cooling plates 22 on each side of the first liquid cooling plate 21 and connecting the multiple second liquid cooling plates 22 on the same side in series via branch pipes 32. This allows the coolant to flow sequentially through the multiple second liquid cooling plates 22. This structure increases the heat transfer path length of the coolant in the sidewall region, enhancing the heat absorption capacity during the heat exchange process.

[0050] Further, see Figure 4 The second liquid cooling plate 22 has a first groove 221 and a second groove 222 respectively on its opposite side walls. The first groove 221 and the second groove 222 are arranged alternately. The single cell 40 is inserted into the first groove 221 or the second groove 222. At least part of the peripheral side wall 41 is in contact with the inner wall of the first groove 221 or the inner wall of the second groove 222.

[0051] In practical applications, this application creates a first groove 221 and a second groove 222 on opposite side walls of the second liquid cooling plate 22, and arranges them alternately. This allows individual battery cells 40 to be inserted into grooves distributed in different directions, thereby achieving close contact and efficient arrangement between the battery cells and the liquid cooling plate. This structural design enables each second liquid cooling plate 22 to provide heat dissipation paths for both sides of the battery cell sidewalls within a limited space, significantly improving the service density and cooling coverage of the liquid cooling plate.

[0052] The staggered arrangement of the first slot 221 and the second slot 222 helps to improve the overall compactness of the battery cell assembly and increases the heat exchange capacity of a unit liquid cooling plate without increasing the number of liquid cooling plates. Simultaneously, the battery cell is inserted into the slot, with its peripheral sidewall 41 at least partially abutting against the inner wall of the slot, forming a large-area thermal contact interface. This effectively reduces contact thermal resistance, improves heat conduction efficiency, and enhances the liquid cooling plate's ability to absorb heat from the battery cell.

[0053] In addition, the battery cell is positioned by a slot, which enables natural positioning and rapid assembly, improves the convenience of manufacturing and maintenance, and helps to ensure the structural stability of the battery cell under thermal expansion and contraction or vibration loads during operation, prevents loosening and displacement, and further enhances the thermal coupling effect between the battery cell and the liquid cooling system.

[0054] Optionally, refer to Figure 4 The branch pipe 32 is a flexible pipe, which includes a connecting part 321 and an extension part 322. The two ends of the extension part 322 are connected to the connecting part 321. One of the connecting parts 321 is connected to the second liquid cooling plate 22, and the other connecting part 321 is connected to the main pipe 31. The extension part 322 is corrugated.

[0055] In practical applications, branch pipe 32 adopts a flexible pipe structure, including a connecting part 321 and a corrugated extension part 322. The two ends of the extension part 322 are respectively connected to two connecting parts 321, one end of which is connected to the second liquid cooling plate 22, and the other end is connected to the main pipe 31. This flexible branch pipe 32 design has good adaptability and deformability, which can effectively alleviate the problems of pipe deformation and stress concentration caused by temperature changes, thermal expansion and contraction or mechanical vibration.

[0056] The corrugated extension 322 gives the branch pipe 32 good elasticity and flexibility, allowing it to flexibly adapt to complex spatial layouts during installation and layout. This facilitates connection between liquid cooling plates and the main pipe 31 in different locations, improving the assembly convenience and maintenance efficiency of the overall liquid cooling system. In addition, the flexible pipe structure effectively avoids the risk of cracks or leaks in rigid pipes under vibration or thermal deformation environments, improving the reliability and safety of system operation.

[0057] In one embodiment, the battery housing includes a first thermally conductive layer (not shown in the figure) and a second thermally conductive layer (not shown in the figure). The first thermally conductive layer is disposed on the first liquid cooling plate 21 for contacting the terminal end 42, and the second thermally conductive layer is disposed on the second liquid cooling plate 22 for contacting the peripheral sidewall 41.

[0058] In practical applications, the battery housing effectively improves the heat transfer efficiency between the liquid cooling plate and key parts of the battery cell by setting a first thermally conductive layer between the first liquid cooling plate 21 and the terminal end 42, and a second thermally conductive layer between the second liquid cooling plate 22 and the peripheral sidewall 41. The first thermally conductive layer ensures close thermal contact between the first liquid cooling plate 21 and the terminal end 42, quickly transferring the heat generated in the current collection area of ​​the battery cell; the second thermally conductive layer fills the tiny gap between the second liquid cooling plate 22 and the peripheral sidewall 41 of the battery cell, improving the heat dissipation contact surface and enhancing the heat dissipation effect of the sidewall.

[0059] This structure avoids thermal resistance caused by poor direct contact or air gaps, improving the overall heat dissipation performance and thermal management uniformity of the liquid cooling plate. Under high power density operation, the cell temperature is more evenly controlled, reducing the risk of local hot spots, improving the thermal stability and safety of the battery pack, extending battery cycle life, and ensuring reliable operation of the power battery system under high-intensity operating conditions.

[0060] In one embodiment, reference is made to Figure 5 and Figure 6 The first liquid cooling plate 21 has a first flow channel 211, a water inlet 212, a water outlet 213 and a flow guide cavity 214. One end of the flow guide cavity 214 has a water inlet 212 and a water outlet 213, and the other end of the flow guide cavity 214 has a first flow channel 211. The circulation pipeline 30 is connected to the flow guide cavity 214 through the water inlet 212 and the water outlet 213.

[0061] In practical applications, the coolant first enters the guide cavity 214. The guide cavity 214 serves as a distribution chamber for the coolant, uniformly distributing it to the first flow channel 211. As the coolant flows within the guide cavity 214, the pressure gradually equalizes, effectively preventing localized scouring or dead zones in low-speed areas caused by excessively high inlet flow velocities. Subsequently, the coolant uniformly enters the first flow channel 211 from the other end of the guide cavity 214. The first flow channel 211 extends along the liquid cooling plate structure, directly contacting the terminal end 42 of the single-cell battery 40, achieving efficient heat exchange with the terminal end 42. The coolant flows continuously along a predetermined path within the first flow channel 211, carrying away the heat generated by the terminal end 42. After flowing through the first flow channel 211, the coolant collects at the outlet 213 within the guide cavity 214, flows out of the liquid cooling plate through the outlet 213, and enters the subsequent part of the circulation pipeline 30, achieving coolant circulation.

[0062] Furthermore, referring toFigure 6 The first flow channel 211 includes a first section 2111, a plurality of spaced second sections 2112 and a plurality of spaced third sections 2113. One end of the plurality of second sections 2112 is connected to the area of ​​the flow guide cavity 214 near the inlet 212, and one end of the plurality of second sections 2112 is connected to the first section 2111. One end of the plurality of third sections 2113 is connected to the area of ​​the flow guide cavity 214 near the outlet 213, and one end of the plurality of third sections 2113 is connected to the first section 2111.

[0063] In practical applications, after the coolant enters the guide cavity 214 through the inlet 212 of the circulation pipe 30, it is first evenly distributed into multiple second-section 2112 flow channels. These second-section 2112 flow channels are spaced apart along different pathways, effectively expanding the flow cross-sectional area of ​​the coolant and reducing the flow velocity and local flow resistance. Simultaneously, the multiple second-section 2112 flow channels converge into the first section 2111, forming a concentrated flow direction for the coolant. The coolant flowing through the first section 2111 then flows into multiple spaced-apart third-section 2113 flow channels. One end of these third-section 2113 flow channels connects to the first section 2111, and the other end connects to the area of ​​the guide cavity 214 near the outlet 213, responsible for guiding the coolant to the outlet.

[0064] In one embodiment, reference is made to Figure 7 The second flow channel 223 includes a fourth section 2231, multiple fifth sections 2232 spaced apart, and multiple sixth sections 2233 spaced apart. The fourth section 2231 is located at the end of the second liquid cooling plate 22 away from the circulation pipe 30. One end of the multiple fifth sections 2232 is connected to the fourth section 2231, and the other end is connected to the circulation pipe 30. One end of the multiple sixth sections 2233 is connected to the fourth section 2231, and the other end is connected to the circulation pipe 30.

[0065] In practical applications, coolant enters multiple fifth-section 2232 flow channels. Each fifth-section 2232 is connected to the fourth-section 2231 at one end and directly connected to the circulation pipe 30 at the other end, allowing coolant to flow from the circulation pipe 30 into the fifth-section 2232 and then converge into the fourth-section 2231. Simultaneously, multiple sixth-section 2233 flow channels are also connected to the fourth-section 2231 at one end and to the circulation pipe 30 at the other end, serving to divert coolant from the fourth-section 2231 back to the circulation pipe 30.

[0066] This structure creates multiple flow paths for the coolant. After being evenly distributed through multiple fifth-section 2232 channels, the coolant converges into the fourth section 2231, and then flows back to the circulation pipe 30 through multiple sixth-section 2233 channels, achieving closed-loop fluid circulation. The multi-parallel flow channel design increases the cross-sectional area for coolant flow, reduces fluid resistance, and avoids excessively high flow velocities and excessive local flow resistance in a single path.

[0067] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0068] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0069] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0070] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery housing for mounting individual battery cells, each individual battery cell comprising adjacent terminal ends and peripheral sidewalls, characterized in that, include: A liquid cooling assembly, comprising a first liquid cooling plate and a second liquid cooling plate, wherein the first liquid cooling plate has a first flow channel and is connected to the pole end, and the second liquid cooling plate has a second flow channel and is connected to the peripheral sidewall. A circulation pipeline is connected to the first liquid cooling plate and communicates with the first flow channel; the circulation pipeline is also connected to the second liquid cooling plate and communicates with the second flow channel.

2. The battery housing according to claim 1, characterized in that, The liquid cooling assembly includes a plurality of second liquid cooling plates, which are respectively disposed on both sides of the first liquid cooling plate.

3. The battery housing according to claim 2, characterized in that, The liquid cooling components are multiple, and the multiple liquid cooling components are arranged at intervals; The circulation pipeline includes a main pipe and multiple branch pipes. Multiple first liquid cooling plates are connected to the main pipe, multiple first flow channels are connected to the main pipe and in parallel, and the branch pipes are connected to the second liquid cooling plates. The second flow channels are connected to the main pipe through the branch pipes.

4. The battery housing according to claim 3, characterized in that, Each side of the first liquid cooling plate is provided with a plurality of second liquid cooling plates spaced apart from each other, and the plurality of second liquid cooling plates located on the same side of the first liquid cooling plate are connected in series through the branch pipe.

5. The battery housing according to claim 4, characterized in that, The second liquid cooling plate has a first groove and a second groove respectively on its opposite side walls. The first groove and the second groove are staggered. The single cell is inserted into the first groove or the second groove, and at least part of the peripheral side wall is in contact with the inner wall of the first groove or the inner wall of the second groove.

6. The battery housing according to claim 3, characterized in that, The branch pipe is a flexible pipe, which includes a connecting part and an extension part. The connecting part is connected to the opposite ends of the extension part. One of the connecting parts is connected to the second liquid cooling plate, and the other connecting part is connected to the main pipe. The extension part is corrugated.

7. The battery housing according to claim 1, characterized in that, The battery housing includes a first thermally conductive layer and a second thermally conductive layer. The first thermally conductive layer is disposed on the first liquid cooling plate for contacting the electrode end, and the second thermally conductive layer is disposed on the second liquid cooling plate for contacting the peripheral sidewall.

8. The battery housing according to claim 1, characterized in that, The first liquid cooling plate has a first flow channel, a water inlet, a water outlet and a flow guiding cavity. The water inlet and the water outlet are distributed at one end of the flow guiding cavity, and the first flow channel is distributed at the other end of the flow guiding cavity. The circulation pipeline is connected to the flow guiding cavity through the water inlet and the water outlet.

9. The battery housing according to claim 8, characterized in that, The first flow channel includes a first section, a plurality of spaced second sections and a plurality of spaced third sections. One end of the plurality of second sections is connected to the area of ​​the flow guide cavity near the inlet, and one end of the plurality of second sections is connected to the first section. One end of the plurality of third sections is connected to the area of ​​the flow guide cavity near the outlet, and one end of the plurality of third sections is connected to the first section.

10. The battery housing according to claim 1, characterized in that, The second flow channel includes a fourth section, a plurality of fifth sections spaced apart, and a plurality of sixth sections spaced apart. The fourth section is located at the end of the second liquid cooling plate away from the circulation pipeline. One end of each of the plurality of fifth sections is connected to the fourth section, and the other end is connected to the circulation pipeline. One end of each of the plurality of sixth sections is connected to the fourth section, and the other end is connected to the circulation pipeline.

11. A battery pack, characterized in that, It includes a single battery cell and a battery housing as described in any one of claims 1-10, wherein the single battery cell is installed inside the battery housing.

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