Cooling mechanism and battery pack

Abstract

The utility model provides a cooling mechanism and a battery pack, relates to the technical field of battery cooling, and aims to optimize the cooling mechanism to a certain extent and improve the cooling temperature uniformity of battery cells. The cooling mechanism provided by the utility model is used for cooling a battery cell in a battery pack, and comprises a runner bracket, a first flow guide piece and a second flow guide piece, a liquid inlet is formed in one end of the flow channel support, one end of the first flow guide part and one end of the second flow guide part are both connected with the end, where the liquid inlet is formed, of the flow channel support, and the other end of the first flow guide part extends in the direction close to the first edge of the flow channel support and forms a first backflow gap with the first edge; and the other end of the second flow guide part extends towards the direction close to the second edge of the runner bracket, and forms a second backflow gap with the second edge, so that a main cooling area, a first backflow area and a second backflow area are formed in the runner bracket through the first flow guide part and the second flow guide part.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cooling, in particular to a cooling mechanism and a battery pack. Background Art

[0002] With the development of energy storage systems, the requirements for heat dissipation accuracy and uniformity of energy storage systems are getting higher and higher. The existing heat dissipation methods mainly include air cooling, liquid cooling plates, and immersion cooling. Since air cooling is noisy, has low heat exchange efficiency, and occupies a large space, and the liquid cooling plate can only cool the battery cell on a single side, the cooling effect is still relatively limited. Therefore, immersion cooling is increasingly used.

[0003] However, due to the immersion cooling method, the temperature is lower at the coolant inlet, and as the coolant flows and absorbs heat, the temperature of the coolant far from the inlet is higher, resulting in a decrease in heat absorption capacity, affecting the uniformity of cooling.

[0004] Therefore, there is an urgent need to provide a cooling mechanism and a battery pack to solve the problems existing in the prior art to a certain extent. Utility Model Content

[0005] The utility model aims to provide a cooling mechanism and a battery pack, so as to optimize the cooling mechanism to a certain extent and improve the cooling uniformity of the battery core.

[0006] The utility model provides a cooling mechanism for cooling battery cells in a battery pack, comprising a flow channel support, a first flow guide and a second flow guide; a liquid inlet is formed at one end of the flow channel support, one end of the first flow guide and one end of the second flow guide are both connected to an end of the flow channel support forming the liquid inlet, the other end of the first flow guide extends in a direction close to the first edge of the flow channel support and forms a first reflux gap with the first edge; the other end of the second flow guide extends in a direction close to the second edge of the flow channel support and forms a second reflux gap with the second edge, so that a main cooling zone, a first reflux zone and a second reflux zone are formed in the flow channel support through the first flow guide and the second flow guide.

[0007] Among them, multiple third flow guide members are connected to the first flow guide member and the second flow guide member; the multiple third flow guide members are arranged at intervals along the extension direction of the first flow guide member and the second flow guide member, and the multiple third flow guide members correspond to the gaps between the battery cells in the battery pack; the multiple third flow guide members are arranged perpendicular to the corresponding first flow guide member and the second flow guide member.

[0008] Specifically, the flow channel support includes a frame and a partition; the frame is C-shaped, the partition is arranged on the open side of the frame, and the partition is parallel to the third guide member.

[0009] Among them, the cooling mechanism provided by the utility model also includes a confluence frame, which is arranged opposite to the flow channel bracket, and has a liquid outlet formed at one end of the confluence frame corresponding to the liquid inlet, and a return port is formed on the confluence frame corresponding to the gap between the battery cells.

[0010] Specifically, the cooling mechanism provided by the utility model also includes a box assembly, the junction frame and the flow channel bracket are both arranged in the box assembly, and the flow channel bracket is located at the top of the box assembly, and the junction frame is located at the bottom of the box assembly; the box assembly is formed with a first positioning port corresponding to the liquid inlet, and the box assembly is formed with a second positioning port corresponding to the position of the liquid outlet.

[0011] Furthermore, the cooling mechanism provided by the utility model also includes a liquid inlet pipe, one end of which passes through the first positioning port into the box assembly and is connected to the liquid inlet on the flow channel bracket, and the other end of the liquid inlet pipe is located outside the box assembly.

[0012] Furthermore, the cooling mechanism provided by the utility model also includes a liquid return pipe, one end of which passes through the second positioning port into the box assembly and is connected to the liquid outlet of the junction frame, and the other end of the liquid return pipe is located outside the box assembly.

[0013] Furthermore, the box assembly includes a box and a cover plate, the box is formed with an open portion, the cover plate is sealed to the open portion and is sealed to the box to form a sealed bearing space.

[0014] Compared with the prior art, the cooling mechanism provided by the utility model has the following advantages:

[0015] The cooling mechanism provided by the utility model is used for cooling the battery cells in the battery pack, and includes a flow channel support, a first flow guide and a second flow guide; a liquid inlet is formed at one end of the flow channel support, one end of the first flow guide and one end of the second flow guide are both connected to the end of the flow channel support forming the liquid inlet, the other end of the first flow guide extends in the direction close to the first edge of the flow channel support, and forms a first reflux gap with the first edge; the other end of the second flow guide extends in the direction close to the second edge of the flow channel support, and forms a second reflux gap with the second edge, so that a main cooling zone, a first reflux zone and a second reflux zone are formed in the flow channel support through the first flow guide and the second flow guide.

[0016] From this analysis, it can be seen that by arranging the first guide member and the second guide member in the flow channel support, one end of the first guide member is connected to one end of the flow channel support forming a liquid inlet, and the other end is connected to the first side of the flow channel support to form a first reflux gap, and one end of the second guide member is connected to one end of the flow channel support forming a liquid inlet, and the other end is connected to the second side of the flow channel support to form a second reflux gap, so that when the coolant enters the flow channel support from the liquid inlet, it can first flow in the main cooling zone and flow to the end away from the liquid inlet.

[0017] When the coolant contacts the end of the flow channel support away from the liquid inlet, it can disperse to both sides and further flow along the edge of the flow channel support, so that it can flow into the first reflow area and the second reflow area from the first reflow gap and the second reflow gap respectively.

[0018] After the low-temperature coolant enters the main cooling zone from the liquid inlet, it can gradually absorb the heat of the battery cells. When it flows back into the first reflow zone and the second reflow zone again, the coolant absorbs the heat of the battery cells far away from the liquid inlet and the temperature increases, thereby neutralizing the battery cells located close to the liquid inlet, achieving uniform cooling and ensuring cooling efficiency.

[0019] In addition, the utility model also provides a battery pack, including multiple battery cells, multiple partition blocks and the above-mentioned cooling mechanism, the multiple battery cells are arranged in parallel to form a battery cell group, the partition block is located between two adjacent battery cells to form a seepage gap between the two adjacent battery cells, and the flow channel bracket is in contact with the upper surface of the battery cell group.

[0020] Among them, the battery pack provided by the utility model also includes a connecting row, and the connecting row is used to connect the multiple battery cells.

[0021] The battery pack using the cooling mechanism provided by the present application can have better temperature uniformity, thereby ensuring the stability of the overall battery pack. In the battery pack, a partition block is further provided between the battery cells, which can separate the multiple battery cells into seepage gaps. After the coolant enters the flow channel bracket, it flows in the horizontal direction and also has downward penetration due to the influence of gravity. Therefore, through the formed seepage gap, the coolant can cover more areas of the battery cells, and the coolant can flow more smoothly, thereby absorbing the heat on the side of the battery cell, achieving temperature uniformity of the heat dissipation of the battery cell, and improving the heat dissipation and cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a flow channel support in a cooling mechanism provided by an embodiment of the utility model from a first perspective;

[0024] Figure 2 A schematic structural diagram of a flow channel support in a cooling mechanism provided by an embodiment of the utility model from a second viewing angle;

[0025] Figure 3 A schematic diagram of the exploded structure of a battery pack provided in an embodiment of the utility model.

[0026] In the figure: 1-flow channel support; 101-frame; 1011-liquid inlet; 1012-main cooling zone; 102-partition; 2-first guide member; 201-first reflux gap; 202-first reflux zone; 3-second guide member; 301-second reflux gap; 302-second reflux zone; 4-third guide member; 5-merging frame; 501-liquid outlet; 502-reflux port; 6-box; 601-first positioning port; 602-second positioning port; 7-liquid inlet pipe; 8-liquid return pipe; 9-cover plate; 10-battery cell; 11-partition block; 12-connecting row. DETAILED DESCRIPTION

[0027] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0028] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0032] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0033] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0034] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0035] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0036] like Figure 1-Figure 3 As shown, the utility model provides a cooling mechanism for cooling the battery cells 10 in a battery pack, comprising a flow channel support 1, a first flow guide 2 and a second flow guide 3; a liquid inlet 1011 is formed at one end of the flow channel support 1, one end of the first flow guide 2 and one end of the second flow guide 3 are both connected to the end of the flow channel support 1 forming the liquid inlet 1011, the other end of the first flow guide 2 extends in a direction close to the first side of the flow channel support 1, and forms a first reflux gap 201 with the first side; the other end of the second flow guide 3 extends in a direction close to the second side of the flow channel support 1, and forms a second reflux gap 301 with the second side, so that a main cooling zone 1012, a first reflux zone 202 and a second reflux zone 302 are formed in the flow channel support 1 through the first flow guide 2 and the second flow guide 3.

[0037] Compared with the prior art, the cooling mechanism provided by the utility model has the following advantages:

[0038] The cooling mechanism provided by the utility model is achieved by arranging a first flow guide member 2 and a second flow guide member 3 in the flow channel support 1, and one end of the first flow guide member 2 is connected to one end of the flow channel support 1 forming a liquid inlet 1011, and the other end forms a first reflux gap 201 with the first side of the flow channel support 1, and one end of the second flow guide member 3 is connected to one end of the flow channel support 1 forming a liquid inlet 1011, and the other end forms a second reflux gap 301 with the second side of the flow channel support 1, so that when the coolant enters the flow channel support 1 from the liquid inlet 1011, it can first flow in the main cooling zone 1012 and then flow to the end away from the liquid inlet 1011.

[0039] When the coolant contacts the end of the flow channel support 1 away from the liquid inlet 1011, it can disperse to both sides and further flow along the edge of the flow channel support 1, so that it can flow into the first reflow area 202 and the second reflow area 302 from the first reflow gap 201 and the second reflow gap 301 respectively.

[0040] After the low-temperature coolant enters the main cooling zone 1012 from the liquid inlet 1011, it can gradually absorb the heat of the battery cell 10. When it flows back into the first reflow zone 202 and the second reflow zone 302 again, the coolant absorbs the heat of the battery cell 10 far away from the liquid inlet 1011 and the temperature increases, thereby being able to neutralize the battery cell 10 located close to the liquid inlet 1011, achieving uniform cooling and ensuring cooling efficiency.

[0041] It can be understood that the flow channel support 1 in the present application is a rectangular hollow frame, so that after the coolant enters the flow channel support 1, it not only flows in the horizontal direction, but also has a flow that penetrates downward under the action of gravity, thereby increasing the contact area between the coolant and the battery cell 10 and improving the heat dissipation effect.

[0042] Alternatively, if Figure 1 Combination Figure 2 As shown, multiple third flow guide members 4 are connected to the first flow guide member 2 and the second flow guide member 3 in the present application; the multiple third flow guide members 4 are arranged at intervals along the extension direction of the first flow guide member 2 and the second flow guide member 3, and the multiple third flow guide members 4 correspond to the gaps between the battery cells 10 in the battery pack.

[0043] By connecting multiple third guide members 4 to the first guide member 2 and the second guide member 3, and preferably, the multiple third guide members 4 in the present application are evenly spaced along the extension direction of the first guide member 2 and the second guide member 3, and are adapted to the thickness of the battery cell 10, so as to better correspond to the size of the battery cell 10, and evenly and accurately guide the coolant into the gaps between the battery cells 10, thereby improving the heat dissipation effect between the gaps of the battery cells 10.

[0044] More preferably, if Figure 2 As shown, the multiple first flow guides 2 in the present application are arranged perpendicular to the corresponding first flow guides 2 and second flow guides 3, so as to correspond to the gaps between the battery cells 10 and ensure the flow conduction capacity.

[0045] Alternatively, if Figure 1 Combination Figure 2 As shown, the flow channel support 1 in the present application includes a frame 101 and a partition 102 ; the frame 101 is C-shaped, the partition 102 is arranged on the open side of the frame 101 , and the partition 102 is parallel to the third guide member 4 .

[0046] The C-shaped frame 101 and the partition 102 disposed on the open side can form a rectangular frame structure, thereby being able to better adapt to the shape of the battery pack. The partition 102 in the present application extends in the vertical direction, that is, is disposed parallel to the third guide member 4, so that the partition 102 can stop the flow of the coolant and realize the reflux of the coolant to both sides, thereby ensuring the uniformity of the cooling of the battery cell 10.

[0047] Alternatively, if Figure 3 As shown, the cooling mechanism provided by the utility model also includes a confluence frame 5, which is arranged opposite to the flow channel support 1, and a liquid outlet 501 is formed at one end of the confluence frame 5 corresponding to the liquid inlet 1011, and a return port 502 is formed on the confluence frame 5 corresponding to the gap of the battery cell 10.

[0048] The cooling mechanism provided by the present application is mainly an immersion cooling mechanism. In actual application, the battery cells 10 are all immersed in the coolant to ensure the cooling effect. In order to ensure the circulation of the coolant, the present application sets a confluence frame 5 and forms a reflux port 502 on the confluence frame 5 corresponding to the gap position of the battery cells 10, so that the coolant can flow to the bottom and enter the confluence frame 5 through the reflux port 502.

[0049] It can be understood that the confluence frame 5 in the present application is a hollow frame structure. When the coolant enters the confluence frame 5 from the reflux port 502, it can flow toward the liquid outlet 501 and flow out from the liquid outlet 501 to realize the circulation of the coolant.

[0050] Preferably, the confluence frame 5 in the present application is a C-shaped structure, and the open side of the confluence frame 5 is connected to the end of the baffle away from the flow channel support 1, so as to form an overall stable structure. In addition, in this way, the inner size of the confluence frame 5 is larger than the outer size of the battery cell 10, so that it can be arranged around the outer side of the battery cell 10, and then when the coolant flows from the gap of the battery cell 10 to the bottom, it can smoothly pass through the reflux port 502.

[0051] In this embodiment, the bottom of the battery cell 10 is in contact with the bottom of the box body 6 , and the coolant does not have the function of cooling and exchanging heat at the bottom of the battery cell 10 .

[0052] On this basis, the distance between the two parallel side strips in the busbar frame 5 of the present application can be shortened so that the distance between the two side strips is smaller than the width of the battery cell 10, thereby being able to play a supporting role, that is, the busbar frame 5 can support the battery cell 10, so that the coolant can also flow at the bottom of the battery cell 10, thereby increasing the heat dissipation area and improving the uniformity of heat dissipation.

[0053] Alternatively, if Figure 3As shown, the cooling mechanism provided by the utility model also includes a box assembly, in which the conduit frame 5 and the flow channel bracket 1 are both arranged in the box assembly, and the flow channel bracket 1 is located at the top of the box assembly, and the conduit frame 5 is located at the bottom of the box assembly; the box assembly is formed with a first positioning port 601 corresponding to the liquid inlet 1011, and the box assembly is formed with a second positioning port 602 corresponding to the position of the liquid outlet 501.

[0054] The box assembly can provide a stable and enclosed bearing space to support the busbar frame 5 , the flow channel support 1 and the battery cell 10 , and can implement the above-mentioned immersion cooling method to improve the cooling effect of the battery cell 10 .

[0055] Accordingly, by forming a first positioning port 601 at a position corresponding to the liquid inlet 1011 of the box assembly, the coolant can flow in, and by forming a second positioning port 602 at a position corresponding to the liquid outlet 501, the coolant can flow out, thereby realizing the circulation of the overall coolant.

[0056] It is understandable that if Figure 3 As shown, the cooling mechanism provided by the utility model further includes a liquid inlet pipe 7, one end of which passes through the first positioning port 601 into the box assembly and is connected to the liquid inlet port 1011 on the flow channel bracket 1, and the other end of the liquid inlet pipe 7 is located outside the box assembly.

[0057] The first positioning opening 601 can provide a stable installation position for the liquid inlet pipe 7 , and by providing the liquid inlet pipe 7 , the liquid inlet port 1011 of the flow channel support 1 can be better connected with the outside to ensure stable input of the coolant.

[0058] Accordingly, if Figure 3 As shown, the cooling mechanism provided by the utility model further includes a liquid return pipe 8, one end of which passes through the second positioning port 602 into the box assembly and is connected to the liquid outlet 501 of the junction frame 5, and the other end of the liquid return pipe 8 is located outside the box assembly.

[0059] The second positioning opening 602 can provide a stable installation position for the liquid return pipe 8 , and by providing the liquid return pipe 8 , the liquid outlet 501 of the manifold frame 5 can be better connected with the outside to ensure stable output of the coolant.

[0060] It is necessary to add that, if Figure 3 As shown, the box assembly in the present application includes a box 6 and a cover plate 9, the box 6 is formed with an open portion, the cover plate 9 is sealed on the open portion, and is sealed to the box 6 to form a sealed bearing space to carry the battery cell 10, the runner bracket 1, the bus frame 5 and the coolant.

[0061] In addition, if Figure 3As shown, the utility model also provides a battery pack, including a plurality of battery cells 10, a plurality of partition blocks 11 and the above-mentioned cooling mechanism, the plurality of battery cells 10 are arranged in parallel to form a battery cell 10 group, the partition block 11 is located between two adjacent battery cells 10, so that a seepage gap is formed between the two adjacent battery cells 10, and the flow channel support 1 is in contact with the upper surface of the battery cell 10 group.

[0062] The battery pack using the cooling mechanism provided by the present application can have better temperature uniformity, thereby ensuring the stability of the overall battery pack. In the battery pack, a partition block 11 is further provided between the battery cells 10, which can separate the multiple battery cells 10 into seepage gaps. After the coolant enters the flow channel bracket 1, it flows in the horizontal direction and also has downward penetration due to the influence of gravity. Therefore, through the formed seepage gaps, the coolant can cover more areas of the battery cells 10, and the coolant can flow more smoothly, thereby absorbing the heat from the side of the battery cell 10, achieving temperature uniformity of the heat dissipation of the battery cell 10, and improving the heat dissipation and cooling effect.

[0063] Accordingly, if Figure 3 As shown, the battery pack provided by the present invention further includes a connecting row 12 , and the connecting row 12 is used to connect the multiple battery cells 10 .

[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling mechanism for cooling a battery cell in a battery pack, characterized in that: It includes a flow channel support, a first flow guide and a second flow guide; A liquid inlet is formed at one end of the flow channel support, one end of the first flow guide member and one end of the second flow guide member are both connected to the end of the flow channel support forming the liquid inlet, and the other end of the first flow guide member extends in a direction close to the first side of the flow channel support and forms a first reflux gap with the first side; The other end of the second flow guide extends toward the second side of the flow channel support and forms a second reflow gap with the second side, so that a main cooling zone, a first reflow zone and a second reflow zone are formed in the flow channel support through the first flow guide and the second flow guide.

2. The cooling mechanism according to claim 1, characterized in that: A plurality of third flow guide members are connected to the first flow guide member and the second flow guide member; The plurality of third flow guides are arranged at intervals along the extension direction of the first flow guide and the second flow guide, and the plurality of third flow guides correspond to the gaps between the battery cells in the battery pack; The plurality of third flow guides are arranged perpendicular to the corresponding first flow guide and the second flow guide.

3. The cooling mechanism according to claim 2, characterized in that: The flow channel support comprises a frame and a partition; The frame is C-shaped, the partition is arranged on the open side of the frame, and the partition is parallel to the third guide member.

4. The cooling mechanism according to claim 1, characterized in that: It also includes a confluence frame, which is arranged opposite to the flow channel support, and has a liquid outlet formed at one end of the confluence frame corresponding to the liquid inlet, and a return port formed on the confluence frame corresponding to the gap between the battery cells.

5. The cooling mechanism according to claim 4, characterized in that: It also includes a box assembly, wherein the confluence frame and the flow channel support are both arranged in the box assembly, and the flow channel support is located at the top of the box assembly, and the confluence frame is located at the bottom of the box assembly; The box assembly is formed with a first positioning opening corresponding to the liquid inlet, and the box assembly is formed with a second positioning opening corresponding to the position of the liquid outlet.

6. The cooling mechanism according to claim 5, characterized in that: It also includes a liquid inlet pipe, one end of which passes through the first positioning port into the box assembly and is connected to the liquid inlet on the flow channel bracket, and the other end of the liquid inlet pipe is located outside the box assembly.

7. The cooling mechanism according to claim 5, characterized in that: It also includes a liquid return pipe, one end of which passes through the second positioning port into the box assembly and is connected to the liquid outlet of the junction frame, and the other end of the liquid return pipe is located outside the box assembly.

8. The cooling mechanism according to claim 5, characterized in that: The box assembly comprises a box and a cover plate. The box is formed with an open portion. The cover plate is sealed on the open portion and is sealedly connected to the box to form a sealed bearing space.

9. A battery pack, characterized in that: It comprises a plurality of battery cells, a plurality of partition blocks and a cooling mechanism as described in any one of claims 1 to 8, wherein the plurality of battery cells are arranged in parallel to form a battery cell group, the partition block is located between two adjacent battery cells so as to form a liquid seepage gap between the two adjacent battery cells, and the flow channel support is in contact with the upper surface of the battery cell group.

10. The battery pack according to claim 9, characterized in that: It also includes a connecting bar, which is used to connect multiple battery cells.

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