Cooling components and battery modules

Abstract

The present application relates to a cooling assembly and a battery module, and relates to the field of battery technology. The cooling assembly includes a plurality of cooling parts and an infusion assembly, each cooling part is provided with a cooling cavity; the infusion assembly includes an infusion tube and a plurality of first current collectors, the plurality of first current collectors are arranged on the infusion tube at intervals, each first current collector is provided with a first infusion port and a second infusion port that are interconnected, the first infusion ports of the plurality of first current collectors are all connected to the infusion tube, and the second infusion port of each first current collector is connected to the cooling cavities of a plurality of adjacent cooling parts. The cooling assembly and the battery module can reasonably distribute the coolant flow of the plurality of cooling cavities, avoid the problem of temperature difference of the battery cells caused by uniform flow, and reduce the probability of safety accidents.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cooling assembly and a battery module. Background Art

[0002] Battery cells generate heat during operation, and cooling components are usually used to cool the large surface of the battery cells. In related technologies, after external liquid enters the cooling component, the cooling component cools different battery cells through different branches. Due to the different path lengths between different branches and the liquid inlet, the coolant flow rates allocated to different branches vary greatly, which can easily lead to large temperature differences between different battery cells, affecting the battery life. Summary of the invention

[0003] In order to solve the above technical problems, the embodiments of the present application provide a cooling assembly and a battery module, which can reasonably distribute the coolant flow of multiple branches, avoid the temperature difference problem of battery cells caused by uniform flow, and ensure the battery life.

[0004] In a first aspect, a cooling assembly is provided, comprising:

[0005] A plurality of cooling elements distributed at intervals, each of the cooling elements being provided with a cooling cavity;

[0006] An infusion assembly comprises an infusion tube and a plurality of first current collectors, wherein the plurality of first current collectors are arranged on the infusion tube at intervals, each of the first current collectors is provided with a first infusion port and a second infusion port which are connected to each other, the first infusion ports of the plurality of first current collectors are all connected to the infusion tube, and the second infusion port of each of the first current collectors is all connected to the cooling cavities of a plurality of adjacent cooling elements.

[0007] According to the first aspect of the present application, the number of the infusion components is two groups, and the two groups of infusion components are respectively arranged at two opposite ends of the cooling element;

[0008] The infusion assembly comprises:

[0009] A plurality of second current collectors, each of which is provided with a third infusion port and a fourth infusion port that are connected to each other, the fourth infusion ports of a plurality of second current collectors are all connected to the second infusion port, and the third infusion ports of different second current collectors are respectively connected to different cooling chambers;

[0010] Wherein, the second current collector is connected to the opposite ends of the cooling member, and the third infusion ports of the second current collectors at the opposite ends are both connected to the cooling cavity; the fourth infusion port of the second current collector at one end is connected to the second infusion port of the first current collector of one group of the infusion components, and the fourth infusion port of the second current collector at the other end is connected to the second infusion port of the first current collector of another group of the infusion components.

[0011] According to the first aspect of the present application, a first isolating member is disposed in the third infusion port, the first isolating member divides the third infusion port into a first sub-port and a second sub-port, the second sub-port is connected to the fourth infusion port, and the first sub-port is used for confluence;

[0012] Among them, for the second current collectors connected to the two opposite ends of the cooling member, the first sub-port and the second sub-port of the second current collector at one end are correspondingly connected to the second sub-port and the first sub-port of the second current collector at the other end.

[0013] According to the first aspect of the present application, the cross-sectional area of ​​the first sub-port is B, the cross-sectional area of ​​the cooling cavity is C, and B and C satisfy: 1 / 2C<B<C.

[0014] According to the first aspect of the present application, the cooling assembly further includes:

[0015] The first connecting tube connects the first current collector and the second current collector adjacent to the first current collector, and opposite ends of the first connecting tube are connected to the second infusion port and the fourth infusion port respectively.

[0016] According to the first aspect of the present application, the cooling assembly further includes:

[0017] A plurality of second connecting tubes, each of which is connected to the fourth infusion ports of two adjacent second current collectors.

[0018] According to the first aspect of the present application, the second current collector is provided with a protrusion, the inner cavity of the protrusion is connected to the fourth infusion port, a sealing ring is sleeved on the protrusion, the second connecting tube is sleeved on the protrusion, and the inner wall of the second connecting tube abuts against the sealing ring.

[0019] According to the first aspect of the present application, the first current collector is connected to the cooling element, and the first current collector is further provided with a fifth infusion port, and the second infusion port is connected to the cooling cavity through the fifth infusion port.

[0020] According to the first aspect of the present application, the first infusion port and the second infusion port of the first current collector are connected by bending;

[0021] The first infusion port and the second infusion port are connected by bending around a reserved area, and the reserved area is provided with a card slot, and the plurality of card slots are used to clamp different parts of the preset object.

[0022] In a second aspect, a battery module is also provided, including:

[0023] Multiple battery cells;

[0024] As in the cooling assembly described in the previous embodiment, the cooling member is attached between two adjacent battery cells.

[0025] The cooling assembly and battery module provided by the embodiment of the present application are connected to the infusion tube through the first infusion ports of multiple first current collectors, and the second infusion port of each first current collector is connected to the cooling chambers of multiple adjacent cooling components, so that the coolant can be gathered in the first current collector, and the gathered coolant is output from the second infusion port. In this way, the second infusion port of each first current collector serves as a new output source of a corresponding group of cooling chambers, and the path lengths between the multiple cooling chambers in the same group and the corresponding second infusion ports are not much different, so the coolant flow rates in the multiple cooling chambers in the same group are not much different; in addition, due to the gathering effect of the multiple first current collectors on the coolant, the coolant flow rates output from the second infusion ports of the multiple first current collectors are also basically the same, and the coolant flow rates in the multiple groups of cooling chambers are also basically the same. In this way, the coolant flow rates of multiple cooling chambers (multiple branches) can be reasonably distributed, effectively improving the problem of different flow rates in different cooling chambers due to different path lengths between the infusion port of the infusion tube and the multiple cooling chambers (i.e., multiple branches) in the related art, and improving the flow consistency in each group of cooling chambers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0027] Figure 1 A schematic structural diagram of a battery module provided by an exemplary embodiment of the present application.

[0028] Figure 2 A schematic structural diagram of a first current collector provided for an exemplary embodiment of the present application.

[0029] Figure 3 A schematic structural diagram of a battery module provided in accordance with another exemplary embodiment of the present application.

[0030] Figure 4 A schematic structural diagram of a second current collector provided as an exemplary embodiment of the present application.

[0031] Figure 5 A schematic structural diagram of a cooling element and a second current collector provided in an exemplary embodiment of the present application.

[0032] Figure 6 A schematic diagram of a coolant flow path provided for an exemplary embodiment of the present application.

[0033] Figure 7 for Figure 1 A magnified schematic diagram of center A.

[0034] Figure 8 A schematic structural diagram of a plurality of second current collectors and a plurality of second connecting tubes provided for an exemplary embodiment of the present application.

[0035] Fig. 9 A schematic structural diagram of a battery module provided in accordance with another exemplary embodiment of the present application.

[0036] Fig.10 A schematic structural diagram of a first current collector provided for another exemplary embodiment of the present application.

[0037] Fig.11 A schematic structural diagram of a cooling element and a first current collector provided for another exemplary embodiment of the present application.

[0038] Fig.12 A comparison table of branch road flow rates of different schemes provided for an exemplary embodiment of the present application.

[0039] Fig.13 This is a comparison result table of branch road flow rates in different embodiments provided in this application.

[0040] Fig.14 A table of main-branch diversion results at the first level for different embodiments provided in the present application.

[0041] Fig.15 This is a branch road flow comparison result table of another embodiment provided in the present application.

[0042] Fig.16 Another embodiment provided by the present application is a table of different main branch diversion results at the first level.

[0043] Figure markings: 100-cooling assembly; 110-cooling element; 111-cooling cavity; 1111-cooling pipe; 112-second collector; 1121-third infusion port; 1122-fourth infusion port; 1123-first isolation member; 1124-first sub-port; 1125-second sub-port; 1126-protrusion; 1127-sealing ring; 120-infusion assembly; 121-infusion tube; 122-first collector; 1221-first infusion port; 1222-second infusion port; 1223-fifth infusion port; 1224-third sub-port; 1225-fourth sub-port; 1226-slot; 1227-second isolation member; 130-first connecting pipe; 140-second connecting pipe; 200-battery module; 210-battery cell; 300-copper busbar. DETAILED DESCRIPTION

[0044] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described here.

[0045] Figure 1 This is a schematic diagram of the structure of a battery module provided by an exemplary embodiment of the present application. Figure 1 As shown, the battery module 200 provided in the embodiment of the present application may include a plurality of battery cells 210 and a cooling assembly 100 , and the cooling assembly 100 may cool down the plurality of battery cells 210 .

[0046] like Figure 1 As shown, the cooling assembly 100 may include a plurality of cooling members 110 distributed at intervals, a cooling member 110 is attached between two adjacent battery cells 210, and each cooling member 110 is provided with a cooling cavity 111. When a coolant is input into the cooling cavity 111, the cooling member 110 can cool down the adjacent battery cells 210. Optionally, the cooling member 110 is attached to the large surface of the battery cell 210 to improve the cooling effect.

[0047] like Figure 1 As shown, the cooling assembly 100 may also include an infusion assembly 120, which can deliver coolant to the cooling cavities 111 of multiple cooling components 110. It should be noted that in the related art, different cooling components 110 are arranged on different delivery branches of the infusion assembly 120. Due to the different path lengths and flow resistances between different branches and the infusion port, the coolant flow rates allocated to different branches in the actual working process vary greatly, which can easily lead to large temperature differences between different battery cells 210, thereby affecting the overall life of the battery module 200. To this end, the cooling assembly 100 and battery module 200 provided in the embodiment of the present application can improve the problem of uneven flow of coolant in different branches.

[0048] Specifically, Figure 2 This is a schematic diagram of the structure of the first current collector provided by an exemplary embodiment of the present application. Figure 1 and Figure 2 As shown, the infusion component 120 may include an infusion tube 121 and a plurality of first current collectors 122. The plurality of first current collectors 122 are arranged at intervals on the infusion tube 121. The cooling liquid in the infusion tube 121 may gather in the plurality of first current collectors 122 to form a convergence, and then be output from the first current collectors 122. In this way, different first current collectors 122 are equivalent to forming new output sources at different parts of the infusion tube 121.

[0049] like Figure 1 and Figure 2 As shown, each first current collector 122 is provided with a first infusion port 1221 and a second infusion port 1222 that are interconnected, the first infusion ports 1221 of the plurality of first current collectors 122 are all connected to the infusion tube 121, and the second infusion port 1222 of each first current collector 122 is connected to the cooling chambers 111 of the plurality of adjacent cooling members 110. Different first current collectors 122 are connected in series on the infusion tube 121, thereby facilitating infusion management.

[0050] For the convenience of subsequent introduction, a plurality of cooling cavities 111 corresponding to the same first current collector 122 are defined as a group of cooling cavities 111. The plurality of first current collectors 122 are connected in series, and the plurality of groups of cooling cavities 111 are connected in parallel. It should be understood that the infusion tube 121 inputs the coolant into the first current collector 122 through the first infusion port 1221, the first current collector 122 gathers the coolant, and the gathered coolant is output from the second infusion port 1222, so that the second infusion port 1222 of each first current collector 122 serves as a new output source for a corresponding group of cooling cavities 111, and the path lengths between the multiple cooling cavities 111 in the same group and the corresponding second infusion ports 1222 are not much different, so the coolant flow rates in the multiple cooling cavities 111 in the same group are not much different; in addition, due to the gathering effect of the multiple first current collectors 122 on the coolant, the coolant flow rates output from the second infusion ports 1222 of the multiple first current collectors 122 are also substantially the same, and the coolant flow rates in the multiple groups of cooling cavities 111 are also substantially the same. In this way, the coolant flow rate of the multiple cooling cavities 111 (multiple branches) can be reasonably distributed, effectively improving the problem in the related art that the flow rates in different cooling cavities 111 are different due to the different path lengths between the infusion port of the infusion tube 121 and the multiple cooling cavities 111 (i.e., multiple branches).

[0051] like Figure 2 and Fig.11As shown, the first infusion port 1221 and the second infusion port 1222 of the first collector 122 are connected by bending, and the first infusion port 1221 and the second infusion port 1222 are connected by bending around a reserved area, and the reserved area is provided with a slot 1226, and the multiple slots 1226 are used to clamp different parts of the preset object.

[0052] It should be noted that the first infusion port 1221 and the second infusion port 1222 are connected in a bent manner, which can slow down the flow rate of the cooling liquid between the first infusion port 1221 and the second infusion port 1222 and reduce the flow output from the second infusion port 1222. In this way, it is prevented that the cooling liquid flow input from the second infusion port 1222 to the cooling cavity 111 of the cooling member 110 adjacent to the first collector 122 is too large, thereby causing excessive flow deviation in the same group of cooling cavities 111.

[0053] In one embodiment, the aforementioned preset objects may include a high voltage wire harness and a low voltage wire harness. Figure 1 As shown, a plurality of first current collectors 122 are arranged side by side, so that a plurality of card slots 1226 are arranged correspondingly side by side, which is convenient for holding a preset object and improves the reliability of the card connection.

[0054] Figure 3 A schematic diagram of the structure of a battery module provided for another exemplary embodiment of the present application. In one embodiment, the aforementioned preset object may also include a copper bar 300. After the copper bar 300 is clamped in the card slot 1226, the coolant flowing through the first current collector 122 may also cool the copper bar 300, which may effectively reduce the temperature of the copper bar 300. In addition, after the copper bar 300 is clamped in the card slot 1226, the copper bar 300 may be fixed in the card slot 1226 by a thermally conductive adhesive, which may transfer heat between the copper bar 300 and the inner wall of the card slot 1226, thereby improving the heat exchange efficiency of the copper bar 300.

[0055] It should be noted that different parts of the preset object can be understood as different parts of the preset object cross section. Different sides of the preset object can be connected to the side and bottom of the slot 1226, so as to not only ensure the reliability of the connection, but also improve the heat exchange effect of the first current collector 122 on the preset object.

[0056] like Figure 2As shown, the slot 1226 is a U-shaped slot. During the assembly process, the notch of the U-shaped slot faces upward to facilitate the installation of the preset object. When the preset object is a copper busbar, the two wide sides of the copper busbar can respectively correspond to the two side sides of the slot 1226, and a narrow side can be connected to the bottom surface of the slot 1226. The first infusion port 1221 is located in the upper half of the first collector 122, which can facilitate the assembly of the first infusion port 1221 and the infusion tube 121, effectively improving the assembly efficiency. The second infusion port 1222 is located below the slot 1226 to increase the contact area between the connecting channel between the first infusion port 1221 and the second infusion port 1222 and the preset object, thereby improving the heat exchange effect. The slot 1226 can also be an L-shaped slot, refer to Fig.11 The notch of the L-shaped groove is upward and away from the cooling cavity 111, which further facilitates the installation of the preset object from the outside of the cooling cavity 111 and improves the installation efficiency.

[0057] like Figure 1 As shown, there are two groups of infusion components 120, which are respectively arranged at opposite ends of the cooling member 110. The coolant can flow between the two groups of infusion components 120 through the cooling cavity 111, thereby improving the cooling effect on the battery cell 210. It can be understood that the card slots 1226 of the first current collectors 122 of the two groups of infusion components 120 can be the same or different, and can be set as needed.

[0058] Specifically, Figure 4 This is a schematic diagram of the structure of the second current collector provided by an exemplary embodiment of the present application. Figures 1 to 4 As shown, the infusion assembly 120 may further include a plurality of second fluid collectors 112, each second fluid collector 112 being provided with a third infusion port 1121 and a fourth infusion port 1122 that are interconnected, the fourth infusion ports 1122 of the plurality of second fluid collectors 112 are all connected to the second infusion port 1222, and the third infusion ports 1121 of different second fluid collectors 112 are respectively connected to different cooling chambers 111.

[0059] In practical applications, the same first current collector 122 is connected to multiple second current collectors 112, and each second current collector 112 is connected to a different cooling cavity 111, that is, the coolant output from the second infusion port 1222 of the first current collector 122 first passes through the fourth infusion port 1122 of the multiple second current collectors 112, and then is output to the corresponding cooling cavity 111 from the third infusion port 1121. By managing multiple groups of cooling cavities 111 through multiple first current collectors 122, the flow difference between different groups of cooling cavities 111 can be reduced.

[0060] like Figure 5As shown, the second current collector 112 is connected to the opposite ends of the cooling member 110, and the third infusion ports 1121 of the second current collector 112 at the opposite ends are both connected to the cooling cavity 111, and the fourth infusion port 1122 of the second current collector 112 at one end is connected to the second infusion port 1222 of the first current collector 122 of one group of infusion components 120, and the fourth infusion port 1122 of the second current collector 112 at the other end is connected to the second infusion port 1222 of the first current collector 122 of another group of infusion components 120.

[0061] It should be understood that the cooling liquid output by the first current collector 122 of one group of infusion components 120 flows into the cooling cavity 111 from one end of the cooling element 110 through the corresponding second current collector 112, and then flows out of the cooling cavity 111 from the other end of the cooling element 110 and enters the second current collector 112 at the other end. In this way, the cooling liquid flowing in the cooling cavity 111 can continuously cool and dissipate heat for the battery cell 210, thereby improving the cooling effect on the battery cell 210.

[0062] Figure 6 A schematic diagram of a coolant flow path provided by an exemplary embodiment of the present application. Figures 4 to 6 As shown, a first isolating member 1123 is provided in the third infusion port 1121, and the first isolating member 1123 separates the third infusion port 1121 into a first sub-port 1124 and a second sub-port 1125, wherein the second sub-port 1125 is connected to the fourth infusion port 1122, and the first sub-port 1124 and the second sub-port 1125 are both connected to the cooling chamber 111; for the second collector 112 connected at two opposite ends of the cooling member 110, the first sub-port 1124 and the second sub-port 1125 of the second collector 112 at one end are connected to the second sub-port 1125 and the first sub-port 1124 of the second collector 112 at the other end correspondingly.

[0063] like Figure 6 As shown, the cross-sectional area of ​​the first sub-opening 1124 is greater than the cross-sectional area of ​​the second sub-opening 1125, so that the first sub-opening 1124 can play a role in converging. Figure 6Taking the state shown as an example, the coolant is input from the fourth infusion port 1122 of the second current collector 112 on the left to the second sub-port 1125 of the second current collector 112 on the left, passes through the cooling cavity 111, cools the battery cell 210, and then reaches the first sub-port 1124 of the second current collector 112 on the right, forms a first convergence at the first sub-port 1124 of the second current collector 112 on the right, and then passes through the cooling cavity 111 again to cool the battery cell 210, and then reaches the first sub-port 1124 of the second current collector 112 on the left, forms a second convergence at the second sub-port 1125 of the second current collector 112 on the left, and then passes through the cooling cavity 111 again to cool the battery cell 210, and then reaches the second sub-port 1125 of the second current collector 112 on the right, and then is output from the fourth infusion port 1122 of the second current collector 112 on the right.

[0064] It should be noted that the above Figure 6 In the flow path of the cooling liquid, firstly, the cooling liquid can pass through the cooling cavity 111 multiple times in a short time, and cool the battery cell 210 multiple times, thereby improving the cooling effect of the battery cell 210; secondly, the cooling liquid passes through different parts of the cooling element 110 ( Figure 5 The cooling liquids in different parts of the cooling element 110 in the directions indicated by the arrows D and E can exchange heat with each other, so that the temperature difference between different parts of the cooling element 110 can be smaller, and the temperature uniformity of the cooling element 110 can be improved. In this way, the temperature difference between different parts of the battery cell 210 can be smaller, avoiding the problem of excessive local temperature of the battery cell 210.

[0065] It should be noted that the cross-sectional area of ​​the first sub-port 1124 is B, and the cross-sectional area of ​​the cooling cavity 111 is C. In order to prevent leakage of the cooling liquid when flowing between the first sub-port 1124 and the cooling cavity 111, the cross-sectional area B should be smaller than the cross-sectional area C. In addition, in order to ensure the infusion efficiency and the convergence efficiency and prevent cross-flow, the cross-sectional area of ​​the first sub-port 1124 is larger than the cross-sectional area of ​​the second sub-port 1125, and the cross-sectional area B of the first sub-port 1124 should be larger than 1 / 2C, that is, the cross-sectional areas B and C should satisfy: 1 / 2C<B<C.

[0066] In one embodiment, the cross-sectional area of ​​the second sub-opening 1125 may be greater than the cross-sectional area of ​​the first sub-opening 1124 .

[0067] like Figure 5As shown, the cooling chamber 111 includes a plurality of stacked cooling pipes 1111, and the plurality of cooling pipes 1111 can cool different parts of the battery cell 210. In addition, the first sub-port 1124 and the second sub-port 1125 are respectively connected to a plurality of cooling pipes 1111, which can avoid the phenomenon of reduced flow velocity and eddy current when the coolant passes through the first sub-port 1124 or the second sub-port 1125 due to the large change in pipe diameter, thereby improving the heat exchange efficiency of the cooling element 110 to the battery cell 210.

[0068] Figure 7 for Figure 1 The enlarged schematic diagram of A in the figure. Figure 1 and Figure 7 As shown, the cooling assembly 100 may also include a first connecting tube 130, which connects the first collector 122 and the second collector 112 adjacent to the first collector 122, and the opposite ends of the first connecting tube 130 are respectively connected to the second infusion port 1222 of the first collector 122 and the fourth infusion port 1122 of the second collector 112.

[0069] It should be understood that the coolant output from the second infusion port 1222 of the first fluid collector 122 first passes through the first connecting tube 130 and then enters the fourth infusion port 1122 of the second fluid. The first connecting tube 130 can appropriately slow down the flow rate of the coolant and reduce the flow rate of the coolant entering the fourth infusion port 1122, thereby avoiding excessive flow of the second fluid collector 112 adjacent to the first fluid collector 122 and improving the flow uniformity between the multiple second fluid collectors 112.

[0070] Figure 8 A schematic diagram of the structure of a plurality of second current collectors and a plurality of second connecting tubes provided in an exemplary embodiment of the present application. Figure 8 As shown, the cooling assembly 100 may further include a plurality of second connecting tubes 140, each second connecting tube 140 being connected to the fourth infusion port 1122 of two adjacent second current collectors 112. Since the battery cell 210 is arranged between two adjacent cooling bodies, there is a distance between the two adjacent second current collectors 112, and the length of the second connecting tube 140 is adapted to the thickness of the battery cell 210. The second connecting tube 140 is arranged between the two adjacent second current collectors 112, which can facilitate the flow of the coolant between the two adjacent second current collectors 112. Figure 8As shown, the second current collector 112 is provided with a protrusion 1126, the inner cavity of the protrusion 1126 is connected to the fourth infusion port 1122, the protrusion 1126 is sleeved with a sealing ring 1127, the second connecting tube 140 is sleeved on the protrusion 1126, and the inner wall of the second connecting tube 140 abuts against the sealing ring 1127. In this way, on the one hand, the protrusion 1126 can be used as a connection carrier of the second connecting tube 140, which is convenient for improving the assembly efficiency of the second connecting tube 140; on the other hand, the sealing ring 1127 can improve the sealing performance between the second connecting tube 140 and the protrusion 1126, and prevent the cooling liquid from leaking between the second connecting tube 140 and the protrusion 1126. Optionally, the ratio of the cross-sectional area of ​​the infusion tube 121 to the cross-sectional area of ​​the second connecting tube 140 is ≥4, so as to reduce the flow deviation and ensure the flow consistency. Among them, the cross-sectional area of ​​the infusion tube 121 and the cross-sectional area of ​​the second connecting tube 140 are the cross-sectional areas of their channels respectively. The larger the ratio of the cross-sectional area of ​​the infusion tube 121 to the cross-sectional area of ​​the second connecting tube 140, the smaller the flow deviation. However, the larger the ratio, the greater the flow resistance. Using a water pump with the same power will easily lead to a smaller flow rate and will also cause damage to the water pump. If a high-powered water pump is selected, the overall occupied volume will also increase, affecting the energy density. At the same time, excessive flow resistance will also cause the cooling component 110 and the pipeline to exceed the pressure resistance value and cause cracking and leakage.

[0071] Fig. 9 This is a schematic diagram of the structure of a battery module provided by another exemplary embodiment of the present application. Fig. 9 As shown, the first current collector 122 can also be directly connected to the cooling member 110 (different from Figure 7 In the embodiment shown, the first current collector 122 is connected to the adjacent second current collector 112 via the first connecting tube 130). That is, Fig. 9 The illustrated embodiment removes the first connecting tube 130 and the second current collector 112 connected to the first connecting tube 130 , which can reduce the number of parts used and lower the manufacturing cost.

[0072] Specifically, Fig.10 FIG. 1 is a schematic diagram of the structure of a first current collector provided by another exemplary embodiment of the present application. Fig. 9 and Fig.10 As shown, the first current collector 122 is further provided with a fifth infusion port 1223, which is communicated with the second infusion port 1222. After the first current collector 122 is connected to the cooling element 110, the fifth infusion port 1223 is communicated with the cooling cavity 111. It should be understood that the infusion tube 121 inputs the coolant into the first current collector 122 through the first infusion port 1221, and the coolant flows from the first infusion port 1221 to the second infusion port 1222, and then flows into the cooling cavity 111 from the fifth infusion port 1223.

[0073] Fig.11This is a schematic diagram of the structure of a cooling element and a first current collector provided by another exemplary embodiment of the present application. Fig.10 and Fig.11 As shown, a second isolating member 1227 is provided in the fifth infusion port 1223, and the second isolating member 1227 separates the fifth infusion port 1223 into a third sub-port 1224 and a fourth sub-port 1225, wherein the fourth sub-port 1225 is connected to the second infusion port 1222, and the third sub-port 1224 and the fourth sub-port 1225 are both connected to the cooling chamber 111; for the first current collector 122 connected at two opposite ends of the cooling member 110, the third sub-port 1224 and the fourth sub-port 1225 of the first current collector 122 at one end are connected to the fourth sub-port 1225 and the third sub-port 1224 of the first current collector 122 at the other end correspondingly.

[0074] like Fig.10 and Fig.11 As shown, the cross-sectional area of ​​the third sub-port 1224 is greater than the cross-sectional area of ​​the fourth sub-port 1225, so that the third sub-port 1224 can play a role in converging. It should be noted that the flow path of the coolant between the first current collectors 122 at the opposite ends is Figure 6 Correspondingly, the functions of the third sub-port 1224 and the fourth sub-port 1225 are similar to the functions of the first sub-port 1124 and the second sub-port 1125 (adjusting the flow direction of the coolant), and the aforementioned description can be referred to, and no further description is given here.

[0075] The following is the verification process:

[0076] Simulation setting conditions: Assuming that the inlet flow rate is 15L / min under normal temperature conditions, model simulation is established through different schemes to evaluate the flow distribution of each main branch; there are 3 branches in total, and the number of cooling parts 110 (branch roads) corresponding to each main branch is 9, 7, and 9 respectively.

[0077] Target requirements: Taking the average flow rate (the average flow rate of the three main branches is 15 / 3=5L / min) as the target, the deviation between the three main branches is required to be controlled within 15%; the deviation of each branch in a single branch is controlled within 5%.

[0078] Option 1: If Fig. 9 and Fig.11 As shown, the first current collector 122 is directly connected to the cooling element 110 , and a second isolation element 1227 is provided in the fifth liquid infusion port 1223 , so that the coolant can flow back and forth in the cooling element 110 .

[0079] Option 2: If Figure 1 , Figure 5 and Figure 7As shown, the first current collector 122 is connected to the adjacent second current collector 112 through the first connecting tube 130 , and a first isolation member 1123 is provided in the third liquid infusion port 1121 , so that the coolant can flow back and forth in the cooling member 110 .

[0080] Fig.12 The following is a comparison table of branch road flow rates of different solutions provided by an exemplary embodiment of the present application. Fig.12 As shown, Scheme 2 can control flow deviation more effectively than Scheme 1. Specifically, the flow distribution in each single cooling element in the three main branches in Scheme 2 is more uniform, especially the first branch in each main branch, i.e., branch 1 ( Fig.12 Section 1 corresponding to the main branch 1), branch road 10 ( Fig.12 The cross section of the main branch 2 corresponds to 10) and the branch road 17 ( Fig.12 The cross section 17 corresponding to the middle main branch 3 is reduced from the initial 42%, 47%, and 28% deviations to -1%, 13%, and -10%, respectively, which significantly reduces the deviation of the first branch.

[0081] Design of cross-sectional area ratio coefficient (main branch cross-sectional area / branch cross-sectional area):

[0082] As shown in the figure above, it is divided into two levels. The first level is from the main line to the branch line. The key parameter is the diameter of the circular section, that is, the main branch line. The second level is the parallel flow channel on the branch line, the parallel main line and the diversion section to the end joint of the smallest cold plate unit, that is, the branch line.

[0083] As described in the above embodiments, the cross-sectional area variation is divided into two levels. The first level can be understood as the liquid infusion tube 121 to the multiple first current collectors 122 ; the second level can be understood as the second connecting tube 140 to the corresponding multiple second current collectors 112 .

[0084] At the first level, in one embodiment, the diameter D1 of the infusion tube 121 is 14 mm, and the flow cross-sectional area S1 is 153.9 mm^2; the cross-sectional area of ​​the first current collector 122 = width × thickness = 9 mm*4 mm = 36 mm^2; its cross-sectional area proportional coefficient k1 = main branch cross-sectional area / branch cross-sectional area = 153.9 / 36 = 4.275>4.

[0085] At the second level, in one embodiment, the diameter D2 of the second connecting tube 140 is 14 mm, and the flow cross-sectional area S2 is 153.9 mm^2; the cross-sectional area of ​​the second current collector 112 is width × thickness = 9 mm*4 mm = 36 mm^2; its cross-sectional area ratio coefficient k1 is main branch cross-sectional area / branch cross-sectional area = 153.9 / 36 = 4.275>4.

[0086] A comparative example based on the above-mentioned scheme 2 is provided:

[0087] Comparative Example 1: The diameter D1 of the infusion tube 121 is 14 mm, and the flow cross-sectional area S2 is 153.9 mm^2;

[0088] The cross-sectional area of ​​the first current collector 122 = 5 mm * 4 mm = 20 mm^2;

[0089] Cross-sectional area ratio coefficient: k1 = main branch cross-sectional area / branch cross-sectional area = 7.695;

[0090] Comparative Example 2: The diameter D1 of the infusion tube 121 is 10 mm, and the flow cross-sectional area S2 is 78.54 mm^2;

[0091] The cross-sectional area of ​​the first current collector 122 = 9 mm * 4 mm = 36 mm^2;

[0092] Cross-sectional area ratio coefficient: k1 = main branch cross-sectional area / branch cross-sectional area = 2.18;

[0093] Comparative Example 3: The diameter D1 of the infusion tube 121 is 6 mm, and the flow cross-sectional area S2 is 28.274 mm^2;

[0094] The cross-sectional area of ​​the first current collector 122 = 9 mm * 4 mm = 36 mm^2;

[0095] Cross-sectional area ratio coefficient: k1 = main branch cross-sectional area / branch road cross-sectional area = 0.785.

[0096] Fig.13 This is a comparison result table of branch road flow rates in different embodiments provided in this application. Fig.14 This is a table of different main branch flow diversion results at the first level of different embodiments provided in this application, that is, a comparison of main branch flow. Fig.14 As shown, on the basis of Scheme 2, the cross-sectional area of ​​the main branch remains unchanged, and the branch flow cross-section of Comparative Example 1 changes from 9*4 to 5*4, the flow deviations of the three main branches gradually approach each other, and the differences between the main branches are significantly reduced; the maximum difference is reduced from 8.82% (Scheme 2 Main Branch 1-Main Branch 2=6.22%+2.6%) to 5.31% (Comparative Example 1 Main Branch 1-Main Branch 3=4.83%+0.48%), and the optimization is obvious, wherein the maximum difference is the maximum value of the difference between the two main branches. From Comparative Example 2 and Comparative Example 3, the diameter of the infusion tube is reduced from 14mm to 10mm, and then to 6mm. From the results of Main Branch 1, the deviation increases from 6.22% to 13.78% and 57.75%; that is, when k1 decreases, the deviations of the three branches become significantly larger, especially the flow of Main Branch 1 increases more, mainly because it is located in the first branch and the flow trajectory is shorter.

[0097] It should be noted that the larger K1 is, the smaller the deviation is. However, the larger K1 is, the greater the flow resistance is. Therefore, k cannot be too large. Too large k will lead to excessive flow resistance. Using a water pump with the same power will easily lead to a smaller retention rate and will also damage the water pump. If a water pump with a large power is selected, it will also lead to an increase in volume and affect the energy density. At the same time, too large flow resistance will also cause the cold plate and pipeline to exceed the withstand pressure value and cause cracking and leakage.

[0098] To this end, the deviations of the main branch and the branch road are comprehensively considered, and the minimum value of K1 can be set, K1>4, which can reduce the overall flow deviation.

[0099] Setting Comparative Example 4:

[0100] In the second level, each branch has 9, 7, and 9 rows of cooling elements connected in parallel respectively; the diameter of the second connecting pipe is D2=10mm, and the flow cross-sectional area is S2=78.54mm^2; the cross-sectional area of ​​the second collector 112 is =9mm*4mm; its cross-sectional area ratio coefficient k1=main branch cross-sectional area / branch cross-sectional area=2.18.

[0101] Fig.15 This is a branch road flow comparison result table of another embodiment provided by the present application. Fig.15 As shown, in Comparative Example 4, at the second level, after the second connecting pipe is changed from 14 mm to 10 mm, k1 decreases, and the maximum difference of each branch road within the three main branches is located in branch 1. The maximum difference increases from 4% (branch 2-branch 7 of Scheme 2=1%+3%) to 14% (branch 1-branch 9 of Comparative Example 4=7%+7%), and the flow uniformity deteriorates significantly.

[0102] Fig.16 Another embodiment provided by the present application is a table of different main branch flow diversion results at the first level. Fig.16 As shown, compared with the second scheme, the k1 of the comparative embodiment 4 is reduced, and the flow deviation of the main branch can be reduced at this time, but the comprehensive Fig.15 Comparison of branch traffic in the second level shows that the maximum difference in branch traffic in Example 4 is significantly greater than that in Solution 2.

[0103] In summary, considering the deviation of the main branch and the maximum difference of the branch road, it is more reasonable to set the cross-sectional area ratio coefficient k>4.

[0104] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0105] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0106] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0107] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0108] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A cooling assembly, characterized in that: include: A plurality of cooling elements (110) distributed at intervals, each of the cooling elements (110) being provided with a cooling cavity (111); An infusion assembly (120) comprises an infusion tube (121), a plurality of first current collectors (122) and a plurality of second current collectors (112); the plurality of first current collectors (122) are arranged at intervals on the infusion tube (121); each of the first current collectors (122) is provided with a first infusion port (1221) and a second infusion port (1222) which are connected to each other; the first infusion port (1221) and the second infusion port (1222) of the first current collector (122) are connected by bending; the first infusion ports (1221) and the second infusion port (1222) of the plurality of first current collectors (122) are connected to each other by bending. The first fluid collector (1221) is connected to the infusion pipe (121); the same first fluid collector (122) is connected to a plurality of second fluid collectors (112); each second fluid collector (112) is provided with a third infusion port (1121) and a fourth infusion port (1122) that are connected to each other; the fourth infusion ports (1122) of the plurality of second fluid collectors (112) are all connected to the second infusion port (1222); and the third infusion ports (1121) of different second fluid collectors (112) are respectively connected to different cooling chambers (111).

2. The cooling assembly according to claim 1, characterized in that The number of the infusion components (120) is two groups, and the two groups of the infusion components (120) are respectively arranged at two opposite ends of the cooling element (110); The second fluid collector (112) is connected to opposite ends of the cooling element (110), and the third infusion ports (1121) of the second fluid collector (112) at opposite ends are both in communication with the cooling cavity (111); the fourth infusion port (1122) of the second fluid collector (112) at one end is in communication with the second infusion port (1222) of the first fluid collector (122) of one group of the infusion components (120), and the fourth infusion port (1122) of the second fluid collector (112) at the other end is in communication with the second infusion port (1222) of the first fluid collector (122) of another group of the infusion components (120).

3. The cooling assembly according to claim 2, characterized in that: A first isolating member (1123) is provided in the third infusion port (1121), the first isolating member (1123) divides the third infusion port (1121) into a first sub-port (1124) and a second sub-port (1125), the second sub-port (1125) is in communication with the fourth infusion port (1122), and the first sub-port (1124) is used for confluence; Among them, for the second current collector (112) connected to the two opposite ends of the cooling member (110), the first sub-port (1124) and the second sub-port (1125) of the second current collector (112) at one end are correspondingly connected to the second sub-port (1125) and the first sub-port (1124) of the second current collector (112) at the other end.

4. The cooling assembly according to claim 3, characterized in that: The cross-sectional area of ​​the first sub-port (1124) is B, the cross-sectional area of ​​the cooling cavity (111) is C, and B and C satisfy: 1 / 2C<B<C.

5. The cooling assembly according to claim 2, characterized in that: The cooling assembly also includes: A first connecting tube (130) is connected to the first current collector (122) and the second current collector (112) adjacent to the first current collector (122), and opposite ends of the first connecting tube (130) are respectively connected to the second infusion port (1222) and the fourth infusion port (1122).

6. The cooling assembly according to claim 2, characterized in that The cooling assembly also includes: A plurality of second connecting tubes (140), each of the second connecting tubes (140) being connected to the fourth infusion ports (1122) of two adjacent second fluid collectors (112).

7. The cooling assembly according to claim 6, characterized in that The second current collector (112) is provided with a protrusion (1126); the inner cavity of the protrusion (1126) is connected to the fourth infusion port (1122); a sealing ring (1127) is sleeved on the protrusion (1126); the second connecting tube (140) is sleeved on the protrusion (1126), and the inner wall of the second connecting tube (140) is in contact with the sealing ring (1127).

8. The cooling assembly according to claim 1, characterized in that The first current collector (122) is connected to the cooling element (110), and the first current collector (122) is also provided with a fifth infusion port (1223), and the second infusion port (1222) is connected to the cooling cavity (111) through the fifth infusion port (1223).

9. The cooling assembly according to any one of claims 1 to 8, characterized in that: The first infusion port (1221) and the second infusion port (1222) are connected by bending around a reserved area, and the reserved area is provided with a clamping slot (1226). The plurality of clamping slots (1226) are used to clamp different parts of the preset object.

10. A battery module, characterized in that: include: A plurality of battery cells (210); The cooling assembly according to any one of claims 1 to 9, wherein the cooling member (110) is attached between two adjacent battery cells (210).

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