Cooling mechanism, battery pack and electric equipment

Abstract

The utility model provides a cooling mechanism, a battery pack and electric equipment, the cooling mechanism comprises at least one cooling assembly, and the cooling assembly comprises at least one cooling plate. The cooling plate is provided with a main inlet, a main outlet and flow channels, the flow channels comprise a main inlet flow channel and a main outlet flow channel which are oppositely arranged, and a plurality of branch flow channels communicated between the main inlet flow channel and the main outlet flow channel, the main inlet flow channel is communicated with the main inlet, the main outlet flow channel is communicated with the main outlet, and the branch flow channels are arranged at intervals in the extending direction of the main inlet flow channel; and meanwhile, the main inlet and the main outlet are positioned on the same side of the plurality of branch runners. The flow path of the cooling medium in the cooling plate is similar to a U shape, so that the cooling effect of the cooling medium is better, and meanwhile, as the main inlet and the main outlet are positioned on the same side of the plurality of branch flow channels, the pipeline assembly communicated with the main inlet and the main outlet and used for conveying the cooling medium is also positioned on the same side of the plurality of branch flow channels; and the space occupied by the overall structure of the cooling mechanism is small.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field, concretely relates to a cooling mechanism, battery pack and electric equipment. BACKGROUND

[0002] In the related art, in order to avoid the problem of thermal runaway of the battery pack, the liquid cooling flow channel and the pressure relief channel are usually arranged at different sides of the battery module, and since the liquid cooling flow channel and the pressure relief channel occupy a large space, when the size of the battery pack is limited, it is difficult to meet the space requirement of the battery module. SUMMARY

[0003] The embodiment of the utility model provides a kind of cooling mechanism, battery pack and electric equipment, can solve the problem of the space that liquid cooling flow channel and pressure relief channel occupy is larger in relevant art.

[0004] In a first aspect, the embodiment of the utility model provides a kind of cooling mechanism, for cooling at least one battery cell group, including at least one cooling component, cooling component includes at least one cooling plate, cooling plate is equipped with: main inlet and main outlet;And flow channel, including oppositely arranged main inlet flow channel and main outlet flow channel, and multiple branch flow channels communicated between main inlet flow channel and main outlet flow channel, main inlet flow channel is communicated to main inlet, main outlet flow channel is communicated to main outlet, and multiple branch flow channels are spaced apart in the extension direction of main inlet flow channel;Wherein, main inlet and main outlet are located at the same side of multiple branch flow channels.

[0005] In an embodiment, multiple branch flow channels include multiple first branch flow channels;Wherein, in the direction that main inlet and main outlet point to multiple branch flow channels, the cross-sectional area of multiple first branch flow channels gradually increases.

[0006] In an embodiment, multiple branch flow channels include multiple second branch flow channels;Wherein, at least one second branch flow channel is arranged between adjacent two first branch flow channels, and adjacent two first branch flow channels include one of the first branch flow channel close to main inlet and main outlet, and the cross-sectional area of one of the first branch flow channel is same with the cross-sectional area of at least one second branch flow channel.

[0007] In an embodiment, the cooling plate is further provided with multiple pressure relief holes, and at least one pressure relief hole is located between corresponding adjacent two branch flow channels;Wherein, the pressure relief hole is used to expose the positive electrode of the battery cell of one battery cell group, and the branch flow channel adjacent to the pressure relief hole is used to be connected with the negative electrode of the battery cell of the battery cell group adjacent to one battery cell group.

[0008] In an embodiment, the cooling plate is further provided with multiple branch communication grooves, and the branch communication groove is arranged in the flow channel wall of corresponding branch flow channel and is communicated with corresponding adjacent two pressure relief holes.

[0009] In an embodiment, the cooling plate is further provided with a main communication groove, which is arranged between the inlet wall of the main inlet and the outlet wall of the main outlet and communicates with the pressure relief holes close to the main inlet and the main outlet.

[0010] In an embodiment, the cooling assembly comprises two cooling plates arranged oppositely, and the pressure relief holes of the two cooling plates are arranged in a staggered manner in the direction in which the main inlet and the main outlet point to the branch flow channels; wherein, in one of the cooling plates, the pressure relief holes are used to expose the positive poles of the battery cells of one battery cell group, and the branch flow channels adjacent to the pressure relief holes are used to be in heat-conducting connection with the negative poles of the battery cells of the battery cell group adjacent to the one battery cell group; wherein, in the other cooling plate, the branch flow channels are used to be in heat-conducting connection with the negative poles of the battery cells of the one battery cell group, and the pressure relief holes adjacent to the branch flow channels are used to expose the positive poles of the battery cells of the adjacent battery cell group.

[0011] In an embodiment, the cooling mechanism comprises a plurality of cooling assemblies arranged oppositely, and each cooling assembly comprises two cooling plates arranged oppositely; wherein, the pressure relief holes of the two cooling plates of each two adjacent cooling assemblies are in communication with each other.

[0012] In an embodiment, the plurality of cooling assemblies are arranged oppositely in the height direction of the cooling mechanism; wherein, the lengths of at least part of the cooling assemblies are different, so that the end portions in the length direction of at least part of the cooling assemblies jointly enclose the mounting space.

[0013] In a second aspect, embodiments of the present application provide a battery pack comprising the cooling mechanism of the first aspect.

[0014] In a third aspect, embodiments of the present application provide a power consumption device comprising the battery pack of the second aspect.

[0015] The cooling mechanism for cooling at least one battery cell group comprises at least one cooling assembly, and the cooling assembly comprises at least one cooling plate. The cooling plate is provided with a main inlet, a main outlet and a flow channel. The flow channel comprises a main inlet flow channel and a main outlet flow channel arranged oppositely, and a plurality of branch flow channels communicated between the main inlet flow channel and the main outlet flow channel. The main inlet flow channel is communicated with the main inlet, the main outlet flow channel is communicated with the main outlet, and the plurality of branch flow channels are arranged in the extension direction of the main inlet flow channel. The main inlet and the main outlet are located on one side of the plurality of branch flow channels. The cooling medium entering from the main inlet flows through the main inlet flow channel, the branch flow channel and the main outlet flow channel in sequence and is finally discharged from the main outlet. In this process, the flow path of the cooling medium is similar to a U shape, and the cooling effect of the cooling medium is better in this case. Since the main inlet and the main outlet are located on the same side of the plurality of branch flow channels, the pipeline assembly communicated with the main inlet and the main outlet and used for transmitting the cooling medium is also located on the same side of the plurality of branch flow channels. Therefore, the space occupied by the cooling mechanism is smaller, and the space utilization rate in the battery pack is larger. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Figure 1 is a structural schematic diagram of a battery pack provided by the embodiment of the present application;

[0018] Figure 2 is Figure 1 a structural schematic diagram of a cooling assembly in the embodiment;

[0019] Figure 3 is Figure 1 a structural schematic diagram of a cooling mechanism in the embodiment;

[0020] Figure 4 is Figure 1 a structural schematic diagram of a cooling assembly in the embodiment;

[0021] Figure 5 is Figure 4 a sectional view of the cooling assembly in the embodiment;

[0022] Figure 6 is Figure 5 an enlarged view of part A in the embodiment;

[0023] Figure 7 is Figure 5 an enlarged view of part B in the embodiment;

[0024] Figure 8 is a schematic diagram of overall temperature difference change of a battery pack as a comparative example;

[0025] Figure 9 is a schematic diagram of overall temperature difference change of a battery pack as an embodiment;

[0026] Explanation of reference signs:

[0027] 100, battery pack; 200, cooling assembly; 210, cooling plate; 211, main inlet; 212, main outlet; 223, branch flow channel; 224, pressure relief hole; 225, branch communication groove; 226, main communication groove; 300, cell group; 400, pipeline assembly; 410, flow channel wall. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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 the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower directions of the device in the actual use or working state, and specifically refer to the drawing direction in the drawings. The "inner" and "outer" refer to the contour of the device.

[0029] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a structural schematic view of a battery pack 100 provided by the embodiments of the present application, Figure 2 is Figure 1 a structural schematic view of a cooling assembly 200 in the battery pack 100, Figure 3 is Figure 1 a structural schematic view of a cooling mechanism in the battery pack 100. The battery pack 100 comprises a cooling mechanism and at least one battery cell group 300, and the cooling mechanism is used to cool the at least one battery cell group 300. The cooling mechanism comprises at least one cooling assembly 200 and a pipeline assembly 400. Each cooling assembly 200 comprises at least one cooling plate 210, and the cooling plate 210 is used to be in thermal connection with the battery cell group 300 to provide a cooling function for the battery cell group 300. The pipeline assembly 400 is used to deliver a cooling medium for the cooling assembly 200 and connect each cooling assembly 200 when the cooling mechanism comprises a plurality of cooling assemblies 200. The number of the battery cell group 300 can be one or more, and the battery cell group 300 comprises a plurality of series and / or parallel connected battery cells.

[0030] Specifically, the cooling plate 210 is provided with a main inlet 211 for flowing in of the cooling medium, a main outlet 212 for flowing out of the cooling medium, and a flow channel connected to the main inlet 211 and the main outlet 212 and used to flow the cooling medium. The cooling medium flows into the cooling plate 210 from the main inlet 211, then flows through the flow channel, and finally flows out of the cooling plate 210 from the main outlet 212.

[0031] Please refer to Figures 4 to 6 , Figure 4 is Figure 1 a structural schematic view of a cooling assembly 200 in the battery pack 100, Figure 5 is Figure 3 a sectional view of the cooling assembly 200 in the battery pack 100, Figure 6 is Figure 5The enlarged view of the middle A part, the flow channel includes oppositely arranged main inlet flow channel and main outlet flow channel, and further includes a plurality of branch flow channels 223 communicated between the main inlet flow channel and the main outlet flow channel. Among them, the main inlet flow channel is communicated with the main inlet 211, the main outlet flow channel is communicated with the main outlet 212, and the plurality of branch flow channels 223 are arranged in the extension direction of the main inlet flow channel, and the main inlet 211 and the main outlet 212 are located on the same side of the plurality of branch flow channels 223.

[0032] The cooling mechanism provided by the embodiment is characterized in that the main inlet 211 and the main outlet 212 are arranged on the same side of the plurality of branch flow channels 223, the main inlet flow channel communicated with the main inlet 211 and the main outlet flow channel communicated with the main outlet 212 are oppositely arranged, the extension direction of the main inlet flow channel is the same as that of the main outlet flow channel, and the main inlet flow channel and the main outlet flow channel are communicated through the plurality of branch flow channels 223, so that the cooling medium entering from the main inlet 211 passes through the main inlet flow channel, the branch flow channel 223 and the main outlet flow channel in turn, and finally flows out of the cooling plate 210 from the main outlet 212. In this process, the flow path of the cooling medium is similar to a U shape, and the path of the cooling medium is relatively long in this case, so that the heat of the battery cell group 300 can be fully absorbed, and therefore the cooling effect is better. In addition, the cooling mechanism further includes a pipeline assembly 400 for conveying the cooling medium, and the plurality of cooling assemblies 200 are communicated through the pipeline assembly 400. Since the main inlet 211 and the main outlet 212 are arranged on the same side of the plurality of branch flow channels 223, the pipeline assembly 400 communicated with the main inlet 211 and the main outlet 212 of each cooling plate 210 is also arranged on the same side of the plurality of branch flow channels 223. This structural design greatly reduces the occupied space, so that the available space rate in the battery pack 100 is larger.

[0033] In some embodiments, the branch flow channel 223 on the cooling plate 210 includes a plurality of first branch flow channels, and the cross-sectional area of the plurality of first branch flow channels gradually increases in the direction in which the main inlet 211 and the main outlet 212 point to the plurality of branch flow channels 223.

[0034] Specifically, when the cooling plate 210 is in heat conduction connection with the battery cell, the cooling medium in the flow channel of the cooling plate 210 absorbs the heat of the battery cell to reduce the temperature of the battery cell. The longer the flow path of the cooling medium in the flow channel, the more heat the cooling medium absorbs, so the temperature of the cooling medium gradually increases. Therefore, in the main inlet flow channel, the closer to the main inlet 211, the lower the temperature of the cooling medium, and the farther from the main inlet 211, the higher the temperature of the cooling medium.

[0035] In the embodiment, the cross-sectional areas of the plurality of first branch flow channels in the direction pointing to the plurality of branch flow channels 223 at the main inlet 211 and the main outlet 212 are designed to gradually increase. In the case of a certain flow rate of the cooling medium, the temperature of the first branch flow channel far from the main inlet 211 is higher than that of the first branch flow channel close to the main inlet 211, but because the cross-sectional area of the flow channel is larger, more cooling medium flows through in the same time, thus compensating for the defect of higher temperature of the cooling medium to a certain extent, so as to realize smaller temperature difference between the first branch flow channels, thereby ensuring smaller temperature difference between the plurality of electric cores cooled by the cooling plate 210, and avoiding the safety hazard caused by large temperature difference between the electric cores in the electric core group 300.

[0036] In some embodiments, the branch flow channels 223 not only include a plurality of first branch flow channels, but also include a plurality of second branch flow channels. At least one second branch flow channel is arranged between two adjacent first branch flow channels, and the two adjacent first branch flow channels include one first branch flow channel close to the main inlet 211 and the main outlet 212, and the cross-sectional area of the one first branch flow channel is the same as that of the at least one second branch flow channel.

[0037] It is easy to understand that the greater the flow rate of the branch flow channels 223 on the cooling plate 210, the better the cooling effect of the cooling plate 210 on the electric core group 300. However, because the flow rate through the pipeline assembly 400 is usually limited, the flow rate through the pipeline assembly 400 cannot be increased indefinitely to enhance the cooling effect of the cooling plate 210. Therefore, under the condition that the flow rate through the pipeline assembly 400 is constant, in order to ensure that each electric core group 300 is properly cooled, it is necessary to ensure that the actual flow rate of the branch flow channels 223 is approximately equal to the theoretical flow rate.

[0038] The actual flow rate is defined as the actual flow rate measured by the branch flow channels 223 on each cooling plate 210 of the battery pack 100 during operation, and the theoretical flow rate is defined as the flow rate required to cool the corresponding electric core group 300 during operation of the battery pack 100. In an embodiment, the cross-sectional area of a first branch flow channel is the same as that of a second branch flow channel, and at this time, the actual flow rate of each first branch flow channel and second branch flow channel on the cooling plate 210 is approximately equal to the theoretical flow rate, and the cooling effect is better.

[0039] We tested according to GB / T 31467-2023 "Lithium-ion power battery pack 100 and system electric performance test method for electric vehicles".

[0040] The test objects are two battery packs 100, one of which is a comparative example and the other is an embodiment. The cooling mechanism of each battery pack 100 includes two cooling component groups, each of which includes six cooling components 200, and each cooling component 200 is provided with a cell group 300 between two cooling plates 210. For details, please refer to Figure 1 . Among them, the plurality of cell groups 300 of the battery pack 100 includes three types of cell groups 300, which are cell group (1) with 18 cell strings in each row, 5 rows in parallel, cell group (2) with 16 cell strings in each row, 5 rows in parallel, and cell group (3) with 14 cell strings in each row, 5 rows in parallel. The plurality of cell groups 300 of the battery pack 100 are placed in the order of cell group (1), cell group (2), cell group (2), cell group (1), cell group (3), and cell group (3) from top to bottom. Among them, the diameters d of the main inlets 211 of the cooling plates 210 of the battery packs 100 of the comparative example and the embodiment, the widths of the branch flow channels 223, and the heights of the branch flow channels 223 are different, and the remaining parameters are the same.

[0041] The test environment is that the cell and the environment temperature are both 30°C, the environment humidity is 60%, the cooling medium is composed of 50% water and 50% ethanol, and the flow rate of the cooling medium is 1000L / H.

[0042] The test results are shown in Tables 1 to 8. Among them, in Tables 1 to 6, the branch flow channel serial numbers in the table from small to large represent each branch flow channel 223 from close to far from the main inlet 211, and the corresponding relative deviation of each branch flow channel 223 represents the deviation between the single flow channel flow rate (actual flow rate through the flow channel during work) and the theoretical flow rate of the branch flow channel 223. In Tables 7 to 8, the main inlet serial numbers in the table from small to large represent each main inlet 211 corresponding to each cooling plate 210 from top to bottom, the single plate flow rate is the actual flow rate of the battery pack 100 through the cooling plate during work, and the corresponding relative deviation of each cooling plate 210 represents the deviation between the single plate flow rate and the theoretical flow rate of the cooling plate.

[0043] Table 1 shows the influence of the branch flow channel height and width of the cooling plate 210 corresponding to the battery cell group (1) in the comparative example on the flow rate of the branch flow channel 223, and Table 2 shows the influence of the branch flow channel height and width of the cooling plate 210 corresponding to the battery cell group (1) in the embodiment on the flow rate of the branch flow channel 223. Table 3 shows the influence of the branch flow channel height and width of the cooling plate 210 corresponding to the battery cell group (2) in the comparative example on the flow rate of the branch flow channel 223, and Table 4 shows the influence of the branch flow channel height and width of the cooling plate 210 corresponding to the battery cell group (2) in the embodiment on the flow rate of the branch flow channel 223. Table 5 shows the influence of the branch flow channel height and width of the cooling plate 210 corresponding to the battery cell group (3) in the comparative example on the flow rate of the branch flow channel 223, and Table 6 shows the influence of the branch flow channel height and width of the cooling plate 210 corresponding to the battery cell group (3) in the embodiment on the flow rate of the branch flow channel 223.

[0044] According to the comparison of Table 1 and Table 2, Table 3 and Table 4, and Table 5 and Table 6, it can be seen that the gradual increase of the cross-sectional area of the first branch flow channel 223 in the direction from the main inlet 211 to the main outlet 212 can reduce the deviation (i.e., the relative deviation) between the actual flow channel (i.e., the single-flow channel flow rate in the table) and the theoretical flow rate of each branch flow channel 223, and in combination with the gradual increase of the cross-sectional area of the second branch flow channel 223 in the direction from the main inlet 211 to the main outlet 212, the overall temperature difference of the battery pack 100 can be reduced. Figure 8 and Figure 9 Figure 8 FIG. 1 is a schematic diagram of the overall temperature difference of the battery pack 100 as a comparative example, Figure 9 FIG. 2 is a schematic diagram of the overall temperature difference of the battery pack 100 as an embodiment) can be seen that the gradual increase of the cross-sectional area of the first branch flow channel 223 in the direction from the main inlet 211 to the main outlet 212 can reduce the overall temperature difference of the battery pack 100.

[0045] In some embodiments, the cooling plate 210 is provided with a plurality of pressure relief holes 224, and at least one pressure relief hole 224 is located between the corresponding adjacent two branch flow channels 223. The pressure relief hole 224 is used to expose the positive electrode of the battery cell of one of the battery cell groups 300, so that the pressure relief hole 224 is communicated with the explosion-proof valve located at the positive electrode of the battery cell. In addition, the branch flow channel 223 adjacent to the pressure relief hole 224 is thermally connected to the negative electrode of the battery cell of the adjacent battery cell group 300 of one of the battery cell groups 300, so as to cool the battery cell.

[0046] ​Specifically, when thermal runaway occurs in the battery cells in the battery cell group 300, high-temperature gas in the battery cells can be generated rapidly and released outside the battery cells through the corresponding explosion-proof valves. By opening the pressure relief holes 224 in the cooling plate 210 and connecting the pressure relief holes 224 to the explosion-proof valves of at least some of the battery cells in the battery module, the accumulation of the high-temperature gas inside the battery cell group 300 can be effectively avoided, thereby avoiding more serious safety problems. The design of the pressure relief holes 224 can enable the generated high-temperature gas to flow smoothly into the pressure relief channels connected thereto, thereby reducing the pressure inside the battery cell group 300 and reducing the risk of accumulation of high-temperature gas.

[0047] In the present embodiment, by providing the plurality of pressure relief holes 224 in the cooling plate 210, the cooling plate 210 can not only cool the battery cells but also provide a pressure relief function for the battery cells when thermal runaway occurs. Compared with the related art in which a cooling device and a pressure relief device are respectively provided in a battery box, the cooling plate 210 in the present embodiment simultaneously has the functions of cooling the battery cells and relieving pressure. Compared with separately designing a liquid cooling flow channel and a pressure relief channel, the present embodiment greatly reduces the space occupied by the structure on the basis of completing the functions of cooling and pressure relief.

[0048] In some embodiments, as shown in Figure 2 , Figure 3 The cooling plate 210 is further provided with a plurality of branch communication grooves 225 arranged in the flow channel walls 410 of the corresponding branch flow channels 223, so that the branch communication grooves 225 communicate with the corresponding adjacent two pressure relief holes 224.

[0049] In the present embodiment, the plurality of pressure relief holes 224 in the liquid cooling plate are connected by the plurality of branch communication grooves 225 to provide more pressure relief space. When thermal runaway occurs in the battery cells, the high-temperature gas generated by the battery cells first enters the corresponding pressure relief space through the corresponding pressure relief hole 224, and then flows into other pressure relief spaces through the branch communication grooves 225 connected to the pressure relief space, thereby further reducing the pressure inside the battery cell group 300.

[0050] In some embodiments, as shown in Figure 2 , Figure 3 The cooling plate 210 is provided with a main communication groove 226 between the inlet wall of the main inlet 211 and the outlet wall of the main outlet 212, and the main communication groove 226 communicates with the pressure relief holes 224 near the main inlet 211 and the main outlet 212.

[0051] On the basis that a plurality of branch communication grooves 225 are arranged on the cooling plate 210 to communicate all the pressure relief holes 224 arranged therein, a main communication groove 226 is arranged on all the cooling plates 210, so that the plurality of pressure relief holes 224 of each layer of liquid cooling plate are communicated, and after high-temperature gas is generated due to thermal runaway of the plurality of battery cells, the high-temperature gas can be gathered to the same pressure relief space through the mutually communicated main communication grooves 226, and then the high-temperature gas is collected or discharged through the pressure relief space.

[0052] In some embodiments, referring to Figure 3 , the cooling assembly 200 includes two cooling plates 210 arranged oppositely, and the plurality of pressure relief holes 224 located between the two cooling plates 210 are arranged in a staggered manner in the direction in which the main inlet 211 and the main outlet 212 point to the plurality of branch flow channels 223. Specifically, the pressure relief holes 224 of the cooling plate 210 are used to expose the positive electrode of the battery cell of the battery cell group 300 to communicate the explosion-proof valve of the battery cell with the pressure relief hole 224, and the outer wall of the flow channel of the cooling plate 210 is used to be in heat-conducting connection with the negative electrode of the battery cell of the battery cell group 300 to provide cooling function for the battery cell. Since the plurality of pressure relief holes 224 on the two oppositely arranged cooling plates 210 are arranged in a staggered manner in the direction in which the main inlet 211 and the main outlet 212 point to the plurality of branch flow channels 223.

[0053] Correspondingly, the plurality of battery cells of the battery cell group 300 located between the two cooling plates 210 are also arranged in a staggered manner in the direction in which the main inlet 211 and the main outlet 212 point to the plurality of branch flow channels 223. Among them, in one cooling plate 210, the pressure relief hole 224 thereof exposes the positive electrode of the battery cell of one battery cell group 300, and the branch flow channel 223 adjacent to the pressure relief hole 224 is used to be in heat-conducting connection with the negative electrode of the battery cell of the adjacent battery cell group 300; among them, in the other cooling plate 210, the branch flow channel 223 thereof is used to be in heat-conducting connection with the negative electrode of the battery cell of one battery cell group 300, and the pressure relief hole 224 adjacent to the branch flow channel 223 is used to expose the positive electrode of the battery cell of the adjacent battery cell group 300.

[0054] It is easy to understand that, assuming that the cooling effect provided by the two oppositely arranged cooling plates 210 is the same, one battery cell group 300 is placed between the two cooling plates 210 for heat dissipation. Since the temperature of the battery cell is not uniformly distributed in the normal working state, if the positive electrodes of all the battery cells in the battery cell group 300 are placed on one side close to one cooling plate 210, and the negative electrodes of all the battery cells are placed on one side close to the other cooling plate 210, the heat absorbed by the cooling plate 210 located on the side with higher temperature of the battery cell will be much greater than the heat absorbed by the cooling plate 210 located on the side with lower temperature of the battery cell, thereby causing uneven distribution of the temperature of the battery cell, which may exist a safety hazard.

[0055] In the embodiment, the plurality of pressure relief holes 224 on the two cooling plates 210 are arranged in a staggered manner in the direction in which the plurality of branch flow channels 223 are directed from the main inlet 211 and the main outlet 212, and the plurality of battery cells in the battery cell group 300 are also arranged in a staggered manner, so that the number of negative electrodes of the battery cells contacted by the two cooling plates 210 is approximately equal, thereby making the temperature of the battery cell group 300 more uniform and reducing the risk of safety problems caused by uneven temperature.

[0056] In some embodiments, referring to Figure 1 , the cooling mechanism includes a plurality of cooling assemblies 200 arranged oppositely, and each cooling assembly 200 includes two cooling plates 210 arranged oppositely. Among them, the plurality of pressure relief holes 224 of the two adjacent cooling plates 210 in each two cooling assemblies 200 are communicated with each other to reduce the internal pressure of the battery cell group 300 when thermal runaway occurs.

[0057] In some embodiments, referring to Figure 1 , the plurality of cooling assemblies 200 are arranged oppositely in the height direction of the cooling mechanism. Among them, the lengths of at least part of the cooling assemblies 200 are different, so that the end portions in the length direction of at least part of the cooling assemblies 200 jointly enclose a mounting space, so that other elements can be arranged in the mounting space, thereby reducing the overall volume of the cooling mechanism to provide portability and production cost of the cooling mechanism.

[0058] The utility model provides a kind of cooling mechanism for cooling at least one battery cell group 300, which includes at least one cooling assembly 200, and the cooling assembly 200 includes at least one cooling plate 210. The cooling plate 210 is provided with a main inlet 211, a main outlet 212 and a flow channel, wherein the flow channel includes a main inlet flow channel and a main outlet flow channel arranged oppositely, and a plurality of branch flow channels 223 communicated between the main inlet flow channel and the main outlet flow channel, and the main inlet flow channel is communicated with the main inlet 211, the main outlet flow channel is communicated with the main outlet 212, and the plurality of branch flow channels 223 are arranged at intervals in the extension direction of the main inlet flow channel, while the main inlet 211 and the main outlet 212 are located on one side of the plurality of branch flow channels 223. The cooling medium entering from the main inlet 211 flows through the main inlet flow channel, the branch flow channel 223 and the main outlet flow channel in sequence and is finally discharged from the main outlet 212. In this process, the flow path of the cooling medium is similar to a U shape, and the cooling effect of the cooling medium is better in this case. At the same time, since the main inlet 211 and the main outlet 212 are located on the same side of the plurality of branch flow channels 223, the pipe assembly 400 for transmitting the cooling medium, which is communicated with the main inlet 211 and the main outlet 212, is also located on the same side of the plurality of branch flow channels 223, so that the cooling mechanism occupies less space, and the available space rate in the battery pack 100 is larger.

[0059] The utility model also provides a kind of battery pack 100, the battery pack 100 includes the cooling mechanism described above, it has the all advantages of above-mentioned cooling mechanism, here no longer repeat.

[0060] The utility model also provides a kind of electrical equipment, the electrical equipment includes the battery pack 100 described above, it has the all advantages of above-mentioned battery pack 100, here no longer repeat.

[0061] The above detailed introduction is carried out to the embodiment of the utility model, the principle and implementation mode of the utility model are described in this paper by applying specific example, the above embodiment is only used to help understanding the method of the utility model and its core thought;Meanwhile, for the person skilled in the art, according to the idea of the utility model, there will be changes in specific implementation mode and application range, and the above-mentioned, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A cooling mechanism for cooling at least one cell group, comprising at least one cooling assembly, the cooling assembly comprising at least one cooling plate, characterized in that, The cooling plate is provided with: a main inlet and a main outlet; and a flow channel including oppositely arranged main inlet flow channel and main outlet flow channel, and a plurality of branch flow channels communicated between the main inlet flow channel and the main outlet flow channel, the main inlet flow channel being communicated with the main inlet, the main outlet flow channel being communicated with the main outlet, and the plurality of branch flow channels being arranged at intervals in the extension direction of the main inlet flow channel; wherein the main inlet and the main outlet are located on the same side of the plurality of branch flow channels.

2. The cooling mechanism according to claim 1, characterized by The plurality of branch flow channels includes a plurality of first branch flow channels; wherein in the direction in which the main inlet and the main outlet point to the plurality of branch flow channels, the cross-sectional area of the plurality of first branch flow channels gradually increases.

3. The cooling mechanism according to claim 2, characterized by The plurality of branch flow channels includes a plurality of second branch flow channels; wherein at least one second branch flow channel is arranged between two adjacent first branch flow channels, and the two adjacent first branch flow channels include one first branch flow channel close to the main inlet and the main outlet, and the cross-sectional area of the one first branch flow channel is the same as that of the at least one second branch flow channel.

4. Cooling mechanism according to any one of claims 1-3, characterized in that The cooling plate is further provided with a plurality of pressure relief holes, at least one of which is located between the corresponding adjacent two branch flow channels; wherein the pressure relief hole is used to expose the positive electrode of the battery cell of one of the battery cell groups, and the branch flow channel adjacent to the pressure relief hole is used to be connected in heat conduction to the negative electrode of the battery cell of the adjacent battery cell group of one of the battery cell groups.

5. The cooling mechanism according to claim 4, characterized by The cooling plate is further provided with a plurality of branch communication grooves, which are arranged on the flow channel wall of the corresponding branch flow channel and communicate the corresponding adjacent two pressure relief holes.

6. The cooling mechanism according to claim 5, characterized by The cooling plate is further provided with a main communication groove, which is arranged between the inlet wall of the main inlet and the outlet wall of the main outlet and communicates the pressure relief holes close to the main inlet and the main outlet.

7. The cooling mechanism according to claim 4, characterized by The cooling assembly includes two oppositely arranged cooling plates, and the plurality of pressure relief holes of the two cooling plates are arranged at different positions in the direction in which the main inlet and the main outlet point to the plurality of branch flow channels; wherein in one of the cooling plates, the pressure relief hole is used to expose the positive electrode of the battery cell of one of the battery cell groups, and the branch flow channel adjacent to the pressure relief hole is used to be connected in heat conduction to the negative electrode of the battery cell of the adjacent battery cell group of one of the battery cell groups; wherein in the other cooling plate, the branch flow channel is used to be connected in heat conduction to the negative electrode of the battery cell of one of the battery cell groups, and the pressure relief hole adjacent to the branch flow channel is used to expose the positive electrode of the battery cell of the adjacent battery cell group.

8. The cooling mechanism according to claim 4, characterized by The cooling mechanism includes a plurality of oppositely arranged cooling assemblies, and each cooling assembly includes two oppositely arranged cooling plates; wherein the plurality of pressure relief holes of the two adjacent cooling plates in each two cooling assemblies are communicated with each other.

9. The cooling mechanism according to claim 8, characterized by The plurality of cooling assemblies are arranged oppositely in the height direction of the cooling mechanism; wherein the lengths of at least part of the cooling assemblies are different, so that the end portions in the length direction of at least part of the cooling assemblies jointly enclose a mounting space.

10. A battery pack, characterized by, The cooling mechanism includes any one of claims 1-9.

11. An electrical device, characterized by The battery pack includes claim 10.

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