Thermal management assembly and battery

Abstract

The application provides a heat management assembly and a battery, comprising a first heat exchange element and a plurality of second heat exchange elements. The first heat exchange element has a first heat exchange flow channel, a plurality of liquid inlet flow channels and a plurality of liquid outlet flow channels, and the plurality of liquid inlet flow channels and the plurality of liquid outlet flow channels are respectively located at two ends of the first heat exchange element along a first direction; the plurality of second heat exchange elements are located on the same side of the first heat exchange element and are sequentially arranged along a second direction; wherein the first heat exchange flow channel comprises an inlet flow section, an outlet flow section and a first flow distribution section, the inlet flow section has a total liquid inlet, the outlet flow section has a total liquid outlet, the plurality of liquid inlet flow channels are connected to the inlet flow section through the first flow distribution section, and the plurality of liquid outlet flow channels are connected to the outlet flow section; the inlet flow section extends along the first direction, the first flow distribution section extends along the second direction, the first flow distribution section is symmetrical about the inlet flow section, and the plurality of liquid inlet flow channels are evenly distributed on both sides of the inlet flow section and are symmetrically arranged relative to the inlet flow section. The heat management assembly provided by the application can improve the uniformity of battery module heat exchange.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a thermal management assembly and a battery. BACKGROUND

[0002] At present, the battery heat exchange system usually adopts the setting mode that the heat exchange plates are placed on both sides of the battery module. When a temperature difference is formed between the battery module and the heat exchange plates, the heat exchange plates and the battery module start to exchange heat, so as to realize the functions of cooling or heating the battery module.

[0003] However, the existing heat exchange plates have poor heat exchange consistency, which causes uneven temperature of the battery module and affects the performance of the battery. SUMMARY

[0004] The embodiments of the present application provide a thermal management assembly and a battery to improve the uniformity of battery module heat exchange and reduce the risk of thermal runaway of the battery module.

[0005] The embodiments of the present application provide a thermal management assembly, which comprises a first heat exchange member and a plurality of second heat exchange members. The first heat exchange member has a first heat exchange flow channel, a plurality of liquid inlet flow channels and a plurality of liquid outlet flow channels. The plurality of liquid inlet flow channels and the plurality of liquid outlet flow channels are respectively located at two ends of the first heat exchange member along a first direction, and the plurality of liquid inlet flow channels and the plurality of liquid outlet flow channels are one-to-one corresponding. The plurality of second heat exchange members are located on the same side of the first heat exchange member and are sequentially arranged along a second direction. The second heat exchange member is provided with a second heat exchange flow channel. The second heat exchange flow channel of each second heat exchange member is connected to one liquid inlet flow channel and one liquid outlet flow channel. The second direction is perpendicular to the first direction. The first heat exchange flow channel comprises an inlet flow section, an outlet flow section and a first flow distribution section. The inlet flow section has a total liquid inlet port, and the outlet flow section has a total liquid outlet port. The plurality of liquid inlet flow channels are connected to the inlet flow section through the first flow distribution section, and the plurality of liquid outlet flow channels are connected to the outlet flow section. The inlet flow section extends along the first direction, the first flow distribution section extends along the second direction, the first flow distribution section is symmetrical about the inlet flow section, and the plurality of liquid inlet flow channels are evenly distributed on both sides of the inlet flow section and are symmetrically arranged relative to the inlet flow section.

[0006] In some embodiments, the first heat exchange flow channel further comprises a second flow distribution section. The plurality of liquid outlet flow channels are connected to the outlet flow section through the second flow distribution section. The outlet flow section extends along the first direction, and the second flow distribution section extends along the second direction. The second flow distribution section is symmetrically arranged relative to the outlet flow section. The plurality of liquid outlet flow channels are evenly distributed on both sides of the outlet flow section and are symmetrically arranged relative to the outlet flow section.

[0007] In some embodiments, the length and the equivalent diameter of any one group of one-to-one corresponding liquid inlet flow channels and liquid outlet flow channels are the same. The part of the second flow distribution section between any two adjacent liquid outlet flow channels and the part of the first flow distribution section between any two adjacent liquid inlet flow channels are one-to-one corresponding and have the same length and equivalent diameter.

[0008] In some embodiments, the fluid resistance of the second heat exchange flow channels of the second heat exchange members is the same.

[0009] In some embodiments, the heat management assembly further comprises a first connecting pipe and a second connecting pipe, the first connecting pipe being in communication with the second heat exchange flow channels and the liquid inlet flow channel, the second connecting pipe being in communication with the second heat exchange flow channels and the liquid outlet flow channel, and the sum of the fluid resistance of the first connecting pipe and the second connecting pipe to which each second heat exchange flow channel is in communication is equal.

[0010] In some embodiments, the plurality of liquid inlet flow channels comprises a plurality of first flow channels and a plurality of second flow channels symmetrically arranged along the inlet flow section,

[0011] The fluid resistance of the plurality of first flow channels from near to far from the total liquid inlet is R1, …, Rn in sequence, and the fluid resistance of each part flow channel from near to far from the total liquid inlet and located between two adjacent first flow channels in the first flow section is RL1, …, RLn-1 in sequence:

[0012] Rx=Rx +1 +R L x,

[0013] wherein 1≤x≤n-1, n is a positive integer greater than 1,

[0014] The fluid resistance Rx, R x+1 x and R L x of each part flow channel described above is calculated as follows:

[0015]

[0016] wherein λ is the flow resistance coefficient, l is the flow channel length (m), q is the flow rate (m 3 / s), and d is the equivalent diameter of the flow channel (m);

[0017] The heat management assembly is configured to change the value of d so that Rx=Rx+1+R L x.

[0018] In some embodiments, the number of first flow channels is 2-5.

[0019] In some embodiments, a containing space is formed between the first heat exchange member and the plurality of second heat exchange members, the containing space comprising a plurality of containing areas corresponding to the plurality of second heat exchange members one by one, and each containing area is used to accommodate one battery module.

[0020] Embodiments of the present application also provide a battery comprising the heat management assembly described above and a plurality of battery modules, a containing space being formed between the first heat exchange member and the plurality of second heat exchange members, and the plurality of battery modules being located in the containing space.

[0021] In some embodiments, the accommodation space comprises a plurality of accommodation regions corresponding to the plurality of second heat exchange members, each accommodation region being configured to accommodate one battery module.

[0022] In the embodiment, the first distribution section in communication with the inflow section is symmetric about the inflow section, and the plurality of liquid inlet channels in communication with the plurality of second heat exchange members are symmetric about the outflow section. In this way, the fluid resistance of the two parts of the first distribution section on both sides of the total liquid inlet is the same, and the fluid resistance of the two parts of the liquid inlet channel on both sides of the total liquid inlet is also the same. Therefore, the heat exchange medium entering from the total liquid inlet can flow into the two parts of the liquid inlet channel on both sides of the inflow section evenly, and flow into the two parts of the second heat exchange channel on both sides of the total liquid inlet from the liquid inlet channel on both sides, so that the flow of the heat exchange medium in the two parts of the second heat exchange channel on both sides of the total liquid inlet is relatively uniform, thereby improving the uniformity of heat exchange on the side of the battery module facing the second heat exchange member on both sides of the total liquid inlet, and reducing the risk of thermal runaway of the battery module caused by uneven heat exchange. BRIEF DESCRIPTION OF DRAWINGS

[0023] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0024] Figure 1 is a structural schematic diagram of a heat management assembly provided by the embodiment of the present application;

[0025] Figure 2 is Figure 1 is a structural schematic diagram of the heat management assembly shown in FIG. 1 from another angle;

[0026] Figure 3 is a schematic diagram of the first heat exchange channel inside the first heat exchange plate of the heat management assembly provided by the embodiment of the present application;

[0027] Figure 4 is another schematic diagram of the first heat exchange channel inside the first heat exchange plate of the heat management assembly provided by the embodiment of the present application;

[0028] Figure 5 is Figure 4 is an enlarged view of A in FIG. 1.

[0029] Label Description:

[0030] 1, first heat exchange member;

[0031] 11, first heat exchange channel; 111, inflow section; 112, outflow section; 113, first distribution section; 114, total liquid inlet; 115, total liquid outlet; 116, second distribution section; 12, liquid inlet channel; 121, first channel; 122, second channel; 13, liquid outlet channel;

[0032] 2, second heat exchange member; 21, second heat exchange channel;

[0033] 31, first connecting pipe; 32, second connecting pipe;

[0034] 4, accommodation space; 41, accommodation area;

[0035] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0036] The embodiments of the present application will be further described below in conjunction with the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0037] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like only serves to facilitate the description of the present application and simplify the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] The orientation words appearing in the following description are the directions shown in the drawings, and are not a limitation on the specific structure of the present application. In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In order to better understand the present application, the following will be described in conjunction with Figures 1 to 5 The embodiments of the present application are described.

[0040] Figure 1 is a structural schematic diagram of a heat management assembly provided by an embodiment of the present application; Figure 2 is a structural schematic diagram of a heat management assembly provided by an embodiment of the present application; Figure 1 is a structural schematic diagram of a heat management assembly provided by an embodiment of the present application; Figure 3 is a structural schematic diagram of a heat management assembly provided by an embodiment of the present application;

[0041] Please refer to Figures 1 to 3The embodiment of the present application provides a heat management assembly, which comprises a first heat exchange element 1 and a plurality of second heat exchange elements 2. The first heat exchange element 1 has a first heat exchange flow channel 11, a plurality of liquid inlet flow channels 12 and a plurality of liquid outlet flow channels 13. The plurality of liquid inlet flow channels 12 and the plurality of liquid outlet flow channels 13 are respectively located at two ends of the first heat exchange element 1 along a first direction X, and the plurality of liquid inlet flow channels 12 and the plurality of liquid outlet flow channels 13 correspond to each other. The plurality of second heat exchange elements 2 are located on the same side of the first heat exchange element 1 and are sequentially arranged along a second direction Y. The second heat exchange element 2 is provided with a second heat exchange flow channel 21. The second heat exchange flow channel 21 of each second heat exchange element 2 is connected to one liquid inlet flow channel 12 and one liquid outlet flow channel 13. The second direction Y is perpendicular to the first direction X.

[0042] The first heat exchange flow channel 11 comprises an inlet flow section 111, an outlet flow section 112 and a first flow distribution section 113. The inlet flow section 111 has a total liquid inlet 114, and the outlet flow section 112 has a total liquid outlet 115. The plurality of liquid inlet flow channels 12 are connected to the inlet flow section 111 through the first flow distribution section 113, and the plurality of liquid outlet flow channels 13 are connected to the outlet flow section 112. The inlet flow section 111 extends along the first direction X, and the first flow distribution section 113 extends along the second direction Y. The first flow distribution section 113 is symmetrical about the inlet flow section 111. The plurality of liquid inlet flow channels 12 are evenly distributed on both sides of the inlet flow section 111 and are symmetrically arranged relative to the inlet flow section 111.

[0043] The number of the liquid inlet flow channels 12 and the liquid outlet flow channels 13 is equal and at least two, and the number is even. For example, the number of the liquid inlet flow channels 12 and the liquid outlet flow channels 13 is four, six or eight.

[0044] The first heat exchange element 1 has two opposite ends in the first direction X. The plurality of liquid inlet flow channels 12 are located at one of the two ends, and the plurality of liquid outlet flow channels are located at the other end. Optionally, the plurality of liquid inlet flow channels 12 and the plurality of liquid outlet flow channels 13 are arranged opposite to each other in the first direction.

[0045] The first heat exchange element 1 and the second heat exchange element 2 of the embodiment of the present application are both plate-shaped elements. The plurality of second heat exchange elements 2 located on the same side of the first heat exchange element 1 means that the plurality of second heat exchange elements 2 are located on the same side of the plate-shaped large surface of the first heat exchange element 1. Further, the first heat exchange element 1 and the plurality of second heat exchange elements 2 are arranged in parallel. Further, the distances between the plurality of second heat exchange elements 2 and the first heat exchange element 1 are equal. That is, the plurality of second heat exchange elements 2 are located at the same height relative to the first heat exchange element 1.

[0046] Each second heat exchange flow channel 21 is connected to one liquid inlet flow channel 12 and one liquid outlet flow channel 13. The second heat exchange element 2 can be connected to the first heat exchange element 1 through an external connecting pipeline, or can be connected to the first heat exchange element 1 through an extension pipeline of itself.

[0047] Optionally, the inlet flow section 111, the outlet flow section 112 and the first flow distribution section 113 are straight flow channels.

[0048] The plurality of liquid inlet flow channels 12 are in direct communication with the first flow distribution section 113, and the first flow distribution section 113 is in direct communication with the inlet flow section 111.

[0049] The first flow distribution section 113 is symmetrical about the inlet flow section 111, i.e. the inlet flow section 111 is located at the midline of the first flow distribution section 113, so that the first flow distribution section 113 is symmetrical about the inlet flow section 111.

[0050] The number of the plurality of liquid inlet flow channels 12 is even, and half of the number of the liquid inlet flow channels 12 are located on one side of the inlet flow section 111 in the second direction Y, and the other half of the number of the liquid inlet flow channels 12 are located on the other side of the inlet flow section 111 in the second direction Y, and the liquid inlet flow channels 12 on the two sides are symmetrical about the inlet flow section 111.

[0051] The first heat exchange member 1 and the plurality of second heat exchange members 2 form a containing space 4 for accommodating a plurality of battery modules, and the first heat exchange member 1 and the second heat exchange member 2 can exchange heat on opposite sides of the battery modules.

[0052] The cross-sectional shape of the liquid inlet flow channel 12, the liquid outlet flow channel 13, the first heat exchange flow channel 11 and the second heat exchange flow channel 21 is not limited in the embodiment of the application, and for example, the cross-sectional shape can be circular, square or other shapes.

[0053] The cross-sectional shape or size of each section of the first heat exchange flow channel 11 is not limited in the embodiment of the application, for example, the cross-sectional shape of each section of the first heat exchange flow channel 11 can be the same, different, or part of the cross-sectional shape of the flow channel is the same and part of the cross-sectional shape of the flow channel is different. The size of the cross section is also the same, which will not be repeated here.

[0054] The cross-sectional shape or size of the plurality of liquid inlet flow channels 12 is not limited in the embodiment of the application, for example, the cross-sectional shape of the plurality of liquid inlet flow channels 12 can be the same, different, or part of the cross-sectional shape of the plurality of liquid inlet flow channels 12 is the same and part of the cross-sectional shape of the plurality of liquid inlet flow channels 12 is different. The size of the cross section of the plurality of liquid inlet flow channels 12 is also the same, which will not be repeated here.

[0055] The cross-sectional shape or size of the plurality of liquid outlet flow channels 13 is not limited in the embodiment of the application, for example, the cross-sectional shape of the plurality of liquid outlet flow channels 13 can be the same, different, or part of the cross-sectional shape of the plurality of liquid outlet flow channels 13 is the same and part of the cross-sectional shape of the plurality of liquid outlet flow channels 13 is different. The size of the cross section of the plurality of liquid outlet flow channels 13 is also the same, which will not be repeated here.

[0056] The total liquid inlet 114 and the total liquid outlet 115 are used to connect external pipelines. After the heat exchange medium enters the total liquid inlet 114, it flows to the first flow section 111, then flows to the first flow section 113, and then flows to the plurality of parallel liquid inlet flow channels 12, and then flows to the second heat exchange flow channel 21 of the corresponding second heat exchange member 2, and then flows to the liquid outlet flow channel 13 corresponding to the liquid inlet flow channel 12, and then flows to the outflow section 112, and then flows out of the total liquid outlet 115. In this process, a plurality of parallel loops are formed, and the parallel loop specifically refers to a loop formed by flowing from the liquid inlet flow channel 12, through the second heat exchange flow channel 21, to the corresponding liquid outlet flow channel 13.

[0057] In the embodiment of the present application, the first flow section 113 in communication with the inflow section 111 is arranged symmetrically about the inflow section 111, and the plurality of liquid inlet flow channels 12 in one-to-one correspondence with the plurality of second heat exchange members 2 are arranged symmetrically about the outflow section 112. In this way, the fluid resistance of the two parts of the first flow section 113 located on both sides of the total liquid inlet 114 is the same, and the fluid resistance of the two parts of the liquid inlet flow channel 12 located on both sides of the total liquid inlet 114 is also the same. Therefore, the heat exchange medium entering the total liquid inlet 114 can flow into the two parts of the liquid inlet flow channel 12 on both sides of the inflow section 111 relatively evenly, and flow from the liquid inlet flow channel 12 on both sides into the two parts of the second heat exchange flow channel 21 also located on both sides of the total liquid inlet 114, so that the flow of the heat exchange medium in the two parts of the second heat exchange flow channel 21 located on both sides of the total liquid inlet 114 is relatively uniform, thereby improving the uniformity of heat exchange on the side of the battery module facing the second heat exchange member 2 located on both sides of the total liquid inlet 114, and reducing the risk of thermal runaway of the battery module caused by uneven heat exchange.

[0058] Optionally, the first heat exchange member 1 includes a blocking portion extending along the second direction Y, and the blocking portion is located between the inflow section 111 and the outflow section 112, so as to separate the total liquid inlet 114 and the total liquid outlet 115.

[0059] Figure 4 is another schematic view of the first heat exchange flow channel inside the first heat exchange plate of the heat management assembly provided by the embodiment of the present application, Figure 5 is Figure 4 is an enlarged view of A in

[0060] Please refer to Figure 4 and Figure 5 In some embodiments, the first heat exchange flow channel 11 further includes a second flow section 116, and the plurality of liquid outlet flow channels 13 are connected to the outflow section 112 through the second flow section 116. The outflow section 112 extends along the first direction X, the second flow section 116 extends along the second direction Y, the second flow section 116 is arranged symmetrically about the outflow section 112, and the plurality of liquid outlet flow channels 13 are evenly distributed on both sides of the outflow section 112 and arranged symmetrically about the outflow section 112.

[0061] The plurality of liquid outlet flow channels 13 of the embodiment of the application directly communicate with the second flow distribution section 116, and the second flow distribution section 116 directly communicates with the outlet section 112.

[0062] The second flow distribution section 116 is symmetrical about the outlet section 112, that is, the outlet section 112 is located at the median line of the second flow distribution section 116, so that the second flow distribution section 116 is symmetrical about the outlet section 112.

[0063] The number of the plurality of liquid outlet flow channels 13 of the embodiment of the application is even, and half of the number of the liquid outlet flow channels 13 are located on one side of the outlet section 112 in the second direction Y, and the other half of the number of the liquid outlet flow channels 13 are located on the other side of the outlet section 112 in the second direction Y, and the liquid outlet flow channels 13 on the two sides are symmetrical about the outlet section 112.

[0064] Optionally, the plurality of liquid inlet flow channels 12 and the plurality of liquid outlet flow channels 13 are arranged at intervals along the second direction Y.

[0065] Optionally, the second flow distribution section 116 is a straight flow channel.

[0066] The second flow distribution section 116 is symmetrical about the outlet section 112, and the plurality of liquid outlet flow channels 13 corresponding to the plurality of second heat exchange members 2 one by one are arranged symmetrically about the outlet section 112, so that the fluid resistance of the two parts of the second flow distribution section 116 located on the two sides of the total liquid outlet 115 is the same, and the fluid resistance of the two parts of the liquid outlet flow channels 13 located on the two sides of the total liquid outlet 115 is also the same, then, in the entire path of the heat exchange medium flowing from the total liquid inlet 114 to the total liquid outlet 115 through the second heat exchange member 2, the fluid resistance provided by the first heat exchange flow channel 11 on the two sides of the total liquid inlet 114 is equal, the fluid resistance provided by the first heat exchange flow channel 11 on the two sides of the total liquid outlet 115 is also equal, the fluid resistance provided by the plurality of liquid inlet flow channels 12 on the two sides of the total liquid inlet 114 is equal, and the fluid resistance provided by the plurality of liquid outlet flow channels 13 on the two sides of the total liquid outlet 115 is also equal, so the uniformity of the flow of the heat exchange medium in the walking path located on the two sides of the total liquid inlet 114 and the total liquid outlet 115 is significantly improved, the uniformity of the flow of the heat exchange medium in the two parts of the second heat exchange flow channel 21 located on the two sides of the total liquid inlet 114 and the total liquid outlet 115 is also improved, the uniformity of the heat exchange on the side of the second heat exchange member 2 of the two parts of the battery module located on the two sides of the total liquid inlet 114 is further improved, and the risk of thermal runaway of the battery module caused by uneven heat exchange is further reduced.

[0067] In some embodiments, the length and the equivalent diameter of any one set of one-to-one corresponding liquid inlet flow channels 12 and liquid outlet flow channels 13 are the same. The length and the equivalent diameter of any one set of two parts corresponding to the part of the second flow distribution section 116 between the adjacent two liquid outlet flow channels 13 and the part of the first flow distribution section 113 between the adjacent two liquid inlet flow channels 12 are the same.

[0068] The cross-sectional shape of the liquid inlet flow channel 12 and the liquid outlet flow channel 13 is not limited in the embodiments of the present application. When the cross-sectional shape is circular, the equivalent diameter is the diameter.

[0069] In the embodiments of the present application, since the plurality of liquid inlet flow channels 12 and the plurality of liquid outlet flow channels 13 are in a one-to-one correspondence, the partial first flow dividing section 113 between the two adjacent liquid inlet flow channels 12 is also in a one-to-one correspondence with the partial second flow dividing section 116 between the two liquid outlet flow channels 13 corresponding to the two liquid inlet flow channels 12. The length and the equivalent diameter of the corresponding partial first flow dividing section 113 and the partial second flow dividing section 116 are the same.

[0070] In this way, the design of the first heat exchange member 1 can be simplified, and the processing and manufacturing are facilitated.

[0071] In some embodiments, the fluid resistance of the second heat exchange flow channel 21 of each second heat exchange member 2 is the same.

[0072] Alternatively, the shape and size of the second heat exchange flow channel 21 of each second heat exchange member 2 are the same.

[0073] The fluid resistance of the second heat exchange flow channel 21 of each second heat exchange member 2 is the same. In this way, in the entire path of the heat exchange medium flowing from the total liquid inlet 114 to the total liquid outlet 115 through the second heat exchange member 2, the fluid resistance provided by the first flow dividing section 113 and the liquid inlet flow channel 12 on both sides of the inlet flow section 111 is equal, the fluid resistance provided by the second flow dividing section 116 and the liquid outlet flow channel 13 on both sides of the outlet flow section 112 is also equal, and the fluid resistance provided by each second heat exchange member 2 is also equal. In this way, the uniformity of the flow of the heat exchange medium on both sides of the total liquid inlet 114 and the total liquid outlet 115 is significantly improved, the uniformity of the flow of the heat exchange medium in the two parts of the second heat exchange flow channel 21 on both sides of the total liquid inlet 114 and the total liquid outlet 115 is also improved, the uniformity of the heat exchange on the side of the second heat exchange member 2 of the two parts of the battery module on both sides of the total liquid inlet 114 is further improved, and the risk of thermal runaway of the battery module caused by uneven heat exchange is further reduced. The two parts of the second heat exchange flow channel 21 on both sides of the total liquid inlet 114 and the total liquid outlet 115 refer to all the second heat exchange flow channels 21 on the left side of the total liquid inlet 114 and the total liquid outlet 115 and all the second heat exchange flow channels 21 on the right side of the total liquid inlet 114 and the total liquid outlet 115.

[0074] In some embodiments, the heat management assembly further comprises a first connecting pipe 31 and a second connecting pipe 32, the first connecting pipe 31 connecting the second heat exchange flow channel 21 and the liquid inlet flow channel 12, and the second connecting pipe 32 connecting the second heat exchange flow channel 21 and the liquid outlet flow channel 13, and the sum of the fluid resistance of the first connecting pipe 31 and the second connecting pipe 32 connected to each second heat exchange flow channel 21 is equal.

[0075] The embodiments are not limited to whether the fluid resistance of the first connecting pipe 31 and the second connecting pipe 32 is the same, and the fluid resistance of the first connecting pipe 31 and the second connecting pipe 32 can be the same or different.

[0076] Optionally, the first connecting pipe 31 and the second connecting pipe 32 are respectively connected to two ends of the second heat exchange member 2 in the first direction X.

[0077] The sum of the fluid resistance of the first connecting pipe 31 and the second connecting pipe 32 connected to each second heat exchange flow channel 21 is equal, so that in the entire path from the total liquid inlet 114 to the total liquid outlet 115 through the second heat exchange member 2, the fluid resistance provided by the two parts of the path on both sides of the total liquid inlet 114 and the total liquid outlet 115 is equal, that is, the flow rate in the two parts of the path on both sides of the total liquid inlet 114 and the total liquid outlet 115 is equal, and the heat exchange on the side of the battery module facing the second heat exchange member 2 of the two parts of the battery module on both sides of the total liquid inlet 114 is uniform, which significantly reduces the risk of thermal runaway of the battery module caused by uneven heat exchange. Among them, the two parts of the path on both sides of the total liquid inlet 114 and the total liquid outlet 115 refer to all the paths through the second heat exchange member 2 on the left side of the total liquid inlet 114 and the total liquid outlet 115 and all the paths through the second heat exchange member 2 on the right side of the total liquid inlet 114 and the total liquid outlet 115.

[0078] In some embodiments, the plurality of liquid inlet flow channels 12 comprises a plurality of first flow channels 121 and a plurality of second flow channels 122 symmetrically arranged along the inlet section 111, the fluid resistance of the plurality of first flow channels 121 from near to far from the total liquid inlet 114 is R1, …, Rn in turn, and the fluid resistance of each part of the flow channel between the first flow channels 121 arranged in turn from near to far from the total liquid inlet 114 is R L1 , …, R Ln-1 :

[0079] Rx=Rx +1 +RLx,

[0080] Wherein, 1≤x≤n-1, n is a positive integer greater than 1,

[0081] The fluid resistance Rx, Rx +1 and R L x of each part of the flow channel is calculated as follows:

[0082]

[0083] wherein, λ is the flow resistance coefficient, l is the length of the flow passage (m), q is the flow rate (m / s), d is the equivalent diameter of the flow passage (m); 3

[0084] The heat management assembly is configured to change the value of d such that Rx = Rx +1 + R L x.

[0085] In the embodiments of the present application, the first flow passage 121 is located on one side of the inlet flow section 111 in the second direction Y, and the second flow passage 122 is located on the other side of the inlet flow section 111 in the second direction Y.

[0086] The above formula is described below with three first flow passages 121, i.e., n = 3 as an example:

[0087] The heat exchange medium flows from the total inlet 114 through the inlet flow section 111, the first flow section 113, the first flow passage 121, the first connecting pipe 31, the second heat exchange flow passage 21, the second connecting pipe 32, the outlet flow passage 13, the second flow section 116, and the outlet flow section 112 to the total outlet 115. Among them, the plurality of first flow passages 121 are in parallel relationship.

[0088] wherein, the inlet flow section 111 is represented by a, the first flow section 113 between the inlet flow section 111 and the first first flow passage 121 closest to the total inlet 114 is represented by b, the first flow section 113 between the first first flow passage 121 and the adjacent second first flow passage 121 is represented by L1, the first flow section 113 between the second first flow passage 121 and the adjacent third first flow passage 121 is represented by L2, the outlet flow section 112 is represented by d, and the second flow section 116 between the outlet flow section 112 and the first outlet flow passage 13 closest to the total outlet 115 is represented by c.

[0089] The fluid resistance suffered by the heat exchange medium flowing through the first first flow passage 121 closest to the total inlet 114 is, in sequence, the fluid resistance R a of the inlet flow section 111; the fluid resistance R b of the first flow section 113 between the inlet flow section 111 and the first first flow passage 121; the fluid resistance R1 of the first first flow passage 121; the sum of the fluid resistances R0 of the first connecting pipe 31, the second heat exchange flow passage 21, and the second connecting pipe 32; the fluid resistance R1 of the first outlet flow passage 13 symmetrical to the first first flow passage 121; the fluid resistance R c of the second flow section 116 between the outlet flow section 112 and the first outlet flow passage 13; and the fluid resistance R d ​The flow rate, equivalent diameter and length of the liquid outlet flow channel 13 corresponding to the first first flow channel 121 are equal to those of the first first flow channel 121, so the fluid resistance is equal, which is R1.

[0090] Therefore, the total fluid resistance of the heat exchange medium flowing through the first first flow channel 121 closest to the total liquid inlet 114 is R a +R b +R1+R0+R1+R c +R d .

[0091] The fluid resistance of the heat exchange medium flowing through the second first flow channel 121 adjacent to the first first flow channel 121 is, in turn, the fluid resistance R a of the inflow section 111; the fluid resistance R b of the first flow dividing section 113 between the inflow section 111 and the first first flow channel 121; the fluid resistance R L1 of the first flow dividing section 113 between the first first flow channel 121 and the second first flow channel 121; the fluid resistance R2 of the second first flow channel 121; the sum R0 of the fluid resistances of the first connecting pipe 31, the second heat exchange flow channel 21 and the second connecting pipe 32; the fluid resistance R2 of the second liquid outlet flow channel 13 symmetrical to the second first flow channel 121; the fluid resistance R L1 of the second flow dividing section 116 between the first liquid outlet flow channel 13 and the outflow section 112; the fluid resistance R c of the outflow section 112. d .

[0092] Similarly, the fluid resistance of the second liquid outlet flow channel 13 symmetrical to the second first flow channel 121 is equal to that of the second first flow channel 121, which is R2. Since the flow rate, equivalent diameter and length of the second flow dividing section 116 between the second liquid outlet flow channel 13 and the first liquid outlet flow channel 13 are equal to those of the first flow dividing section 113 between the second first flow channel 121 and the first first flow channel 121, the fluid resistance of the second flow dividing section 116 between the second liquid outlet flow channel 13 and the first liquid outlet flow channel 13 is equal to that of the first flow dividing section 113 between the first first flow channel 121 and the second first flow channel 121, which is R L1 .

[0093] Therefore, the total fluid resistance of the heat exchange medium flowing through the second first flow channel 121 adjacent to the first first flow channel 121 is R a +R b +R L1 +R2+R0+R2+R L1+R c +R d .

[0094] Similarly, the fluid resistance of the heat exchange medium flowing through the third first flow channel 121 adjacent to the second first flow channel 121 is in turn: the fluid resistance R a of the inflow section 111; the fluid resistance R b of the first branch section 113 between the inflow section 111 and the first first flow channel 121; the fluid resistance R L1 of the first branch section 113 between the first first flow channel 121 and the second first flow channel 121; the fluid resistance R L2 of the third first flow channel 121; the sum of the fluid resistance R0 of the first connecting pipe 31, the second heat exchange flow channel 21 and the second connecting pipe 32; the fluid resistance R3 of the third liquid outlet flow channel 13 symmetrical to the third first flow channel 121; the fluid resistance R L2 of the second branch section 116 between the second liquid outlet flow channel 13 and the third liquid outlet flow channel 13; the fluid resistance R L1 of the second branch section 116 between the first liquid outlet flow channel 13 and the outflow section 112; the fluid resistance R c of the outflow section 112. d .

[0095] Therefore, the total fluid resistance of the heat exchange medium flowing through the third first flow channel 121 adjacent to the second first flow channel 121 is R a +R b +R L1 +R L2 +R3+R0+R3+R L2 +R L1 +R c +R d .

[0096] The fluid resistances of the above three paths are equal, and it can be obtained that:

[0097] R a +R b +R1+R0+R1+R c +R d

[0098] =R a +R b +R L1 +R2+R0+R2+R L1 +R c +R d

[0099] = R a + R b + R L1 + R L2 + R3+ R0+ R3+ R L2 + R L1 + R c + R d

[0100] After simplifying, we can get:

[0101] R1= R L1 + R2= R3+ R L2 + RL1

[0102] That is, R1= R L1 + R2, R2= R3+ R L2 ,

[0103] Therefore, when the heat exchange medium passes through two adjacent first flow channels 121 from the total inlet 114 to the total outlet 115, the fluid resistance is equal, and we can get:

[0104] Rx= Rx+1+ RLx,

[0105] Where, 1≤x≤n-1, n is a positive integer greater than 1, and equal to the number of first flow channels 121.

[0106] According to the formula of fluid resistance:

[0107] Substitute v=q / s, s=π*(d / 2) 2 into the formula of fluid resistance We can get: Rx, Rx +1 and R L x are calculated by this formula.

[0108] The flow resistance coefficient λ can be calculated by the following formula:

[0109] λ=64 / Re, Re=ρvd / μ, v=q / s, s=π*(d / 2) 2

[0110] Where, Re is the Reynolds number, v is the flow rate of the heat exchange medium (m 3 / s), ρ is the density of the heat exchange medium (kg / m3), d is the equivalent diameter of the flow channel (m), q is the flow rate (m 3 / s), and μ is the viscosity coefficient. The value of the viscosity coefficient μ can be obtained by consulting the table.

[0111] The flow rate q is a preset value, and the flow rates of the plurality of first flow channels 121 are set to be equal. The flow rates of the plurality of liquid outlet flow channels 13 are equal to the flow rates of the corresponding first flow channels 121. The flow rates of the first partial flow sections 113 can be calculated according to the flow rates of the first flow channels 121. For example, the flow rates of the three first flow channels 121 are set to be 1 m 3 / s, the flow rate of the first partial flow section 113 between the second first flow channel 121 and the third first flow channel 121 is 1 m 3 / s, the flow rate of the first partial flow section 113 between the second first flow channel 121 and the first first flow channel 121 is 2 m 3 / s.

[0112] The flow channel length l is a preset value.

[0113] Therefore, by changing the values of d in Rx, Rx+1, and R L x, Rx=Rx+1+RLx can be obtained.

[0114] The number of the first flow channels 121 in the embodiments of the present application is three, and in actual application scenarios, the number of the first flow channels 121 can be two, four, five, or more.

[0115] In the embodiments of the present application, the first partial flow section 113 is symmetric about the inflow section 111, the plurality of liquid inlet flow channels 12 are evenly distributed on both sides of the inflow section 111 and are symmetrically arranged relative to the inflow section 111, the second partial flow section 116 is symmetrically arranged relative to the outflow section 112, and the plurality of liquid outlet flow channels 13 are evenly distributed on both sides of the outflow section 112 and are symmetrically arranged relative to the outflow section 112. Therefore, only the equivalent diameters of the plurality of liquid inlet flow channels 12 and the corresponding parts of the first partial flow section 113 on one side of the inflow section 111 need to be designed, and the other side can be symmetrically arranged.

[0116] By using the above formula and changing the value of d, the fluid resistance in all paths through the second heat exchange element 2 can be equal. In this way, the flow rates of the heat exchange medium in all paths through the second heat exchange element 2 are equal, the heat exchange effects of the plurality of second heat exchange elements 2 on the plurality of battery modules are the same, the uniformity of heat exchange on the side of the second heat exchange element 2 facing the different battery modules is significantly improved, and the risk of thermal runaway of the battery modules caused by uneven heat exchange is greatly reduced.

[0117] In some embodiments, the number of the first flow channels 121 is 2-5.

[0118] Too many flow channels will result in too small equivalent diameter of the flow channels and difficult to manufacture, and also result in too large size of the battery in the second direction Y. Therefore, the number of the first flow channels 121 is set to 2-5, which can improve the problem of too small equivalent diameter of the flow channels and difficult to manufacture, and also reduce the size of the battery in the second direction Y.

[0119] In some embodiments, the accommodation space 4 is formed between the first heat exchange member 1 and the plurality of second heat exchange members 2, and the accommodation space 4 includes a plurality of accommodation areas 41 corresponding to the plurality of second heat exchange members 2, each of the accommodation areas 41 being used for accommodating one battery module.

[0120] Each of the second heat exchange members 2 is arranged and connected with one battery module. For example, the second heat exchange member 2 is connected with the battery module by means of bonding or threaded connection.

[0121] Each of the second heat exchange members 2 is arranged with one battery module, so that each of the second heat exchange members 2 exchanges heat with one battery module separately, which not only has better heat exchange effect, but also is convenient for layout.

[0122] The embodiments of the present application also provide a battery, which includes the above-mentioned heat management assembly and a plurality of battery modules, the accommodation space 4 is formed between the first heat exchange member 1 and the plurality of second heat exchange members 2, and the plurality of battery modules are located in the accommodation space 4.

[0123] In some embodiments, the accommodation space 4 includes a plurality of accommodation areas 41 corresponding to the plurality of second heat exchange members 2, each of the accommodation areas 41 being used for accommodating one battery module.

[0124] As described above, each of the second heat exchange members 2 is connected with one battery module and exchanges heat, which not only has better heat exchange effect, but also is convenient for layout.

[0125] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the present application without departing from the scope of the present application, and equivalent components can be substituted for the components thereof, especially, the technical features mentioned in each of the embodiments can be combined in any manner without structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A thermal management assembly, characterized by, include: The first heat exchanger has a first heat exchange channel, multiple liquid inlet channels and multiple liquid outlet channels. The multiple liquid inlet channels and the multiple liquid outlet channels are respectively located at both ends of the first heat exchanger along a first direction, and the multiple liquid inlet channels and the multiple liquid outlet channels correspond one-to-one. Multiple second heat exchange elements are located on the same side of the plate-shaped surface of the first heat exchange element and are arranged sequentially along the second direction. The first heat exchange element and the multiple second heat exchange elements are arranged in parallel. Each second heat exchange element is provided with a second heat exchange channel. The second heat exchange channel of each second heat exchange element is connected to an inlet channel and an outlet channel. The second direction is perpendicular to the first direction. The first heat exchanger and the plurality of second heat exchangers form an accommodating space, the accommodating space including a plurality of accommodating areas corresponding one-to-one with the plurality of second heat exchangers, each accommodating area being used to accommodate a battery module; The first heat exchange channel includes an inlet section, an outlet section, and a first branch section. The inlet section has a total liquid inlet, the outlet section has a total liquid outlet, the plurality of inlet channels are connected to the inlet section through the first branch section, and the plurality of outlet channels are connected to the outlet section. The inlet section extends along the first direction, the first branch section extends along the second direction, the first branch section is symmetrical about the inlet section, and the plurality of liquid inlet channels are evenly distributed on both sides of the inlet section and are symmetrically arranged relative to the inlet section.

2. The thermal management assembly of claim 1, wherein, The first heat exchange channel further includes a second branch section, through which the plurality of liquid outlet channels are connected to the outlet section. The outflow section extends along the first direction, the second diversion section extends along the second direction, the second diversion section is symmetrically arranged about the outflow section, and the plurality of liquid outlet channels are evenly distributed on both sides of the outflow section and are symmetrically arranged relative to the outflow section.

3. The thermal management assembly of claim 2, wherein, The length and equivalent diameter of any one-to-one corresponding inlet and outlet channels are the same; The portion of the second diversion section located between two adjacent outlet channels corresponds one-to-one with the portion of the first diversion section located between two adjacent inlet channels, and the length and equivalent diameter of any two corresponding portions are the same.

4. The thermal management assembly of claim 3, wherein, The fluid resistance of the second heat exchange channel in each of the second heat exchange components is the same.

5. The thermal management assembly of claim 4, wherein, It also includes a first connecting pipe and a second connecting pipe, the first connecting pipe connecting the second heat exchange channel and the liquid inlet channel, and the second connecting pipe connecting the second heat exchange channel and the liquid outlet channel. The sum of the fluid resistances of the first and second connecting pipes connected to each of the second heat exchange channels is equal.

6. The thermal management assembly of claim 5, wherein, The plurality of inlet channels include a plurality of first channels and a plurality of second channels symmetrically arranged along the inlet section. The fluid resistances of the multiple first flow channels, arranged from closest to furthest from the main inlet, are R1, ..., Rn, respectively. The fluid resistances of the first branch section, located between two adjacent first flow channels and arranged from closest to furthest from the main inlet, are RL1, ..., RLn-1, respectively. Rx = Rx + 1 + RLx Where 1 ≤ x ≤ n-1, and n is a positive integer greater than 1. The fluid resistances Rx, Rx+1 and RLx of the above-mentioned parts of flow channels are calculated by the following formula: R= ， where λ is the flow resistance coefficient, l is the flow passage length in meters, and q is the flow rate in cubic meters per second 3 / s, and d is the equivalent diameter of the flow passage in meters. The heat management assembly is configured to change the value of d so that Rx=Rx+1+RLx.

7. The thermal management assembly of claim 6, wherein, The number of the first flow channels is 2-5.

8. A battery, characterized by The heat management assembly according to any one of claims 1-7 and a plurality of battery modules, a containing space is formed between the first heat exchange member and the plurality of second heat exchange members, and the plurality of battery modules are located in the containing space.

9. The battery of claim 8, wherein, The containing space comprises a plurality of containing areas corresponding to the plurality of second heat exchange members, and each containing area is used for containing one battery module.

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