Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, the battery pack has a first direction and a second direction which intersect with each other and comprises a battery monomer and a heat management component, and the heat management component comprises a heat exchange body, a first current collector and a second current collector; the heat exchange body comprises a plurality of heat exchange parts which are arranged at intervals in the second direction, the heat exchange parts are connected with the single batteries, and the heat exchange parts are provided with heat exchange cavities; the first current collector and the second current collector are arranged on the two sides of the heat exchange body in the first direction correspondingly. The first current collector is provided with a plurality of first hole channels and comprises a plurality of first connecting pieces which are arranged at intervals in the second direction, and each first hole channel penetrates through one first connecting piece; the second current collector is provided with a plurality of second hole channels and comprises a plurality of second connecting pieces arranged at intervals in the second direction, and each second hole channel penetrates through one second connecting piece; each heat exchange part is connected with one first connecting piece and one second connecting piece in a sealed mode, and a heat exchange cavity of each heat exchange part communicates with one first hole channel and one second hole channel.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery pack and an electrical device. Background Art

[0002] As the core part of electric vehicles, batteries have high requirements for safety and life. During the use of batteries, the battery cells in the battery pack will generate a lot of heat during the charging and discharging process, which will cause the temperature inside the battery to rise, seriously affecting the performance and life of the battery. Utility Model Content

[0003] Purpose of the utility model: An embodiment of the present application provides a battery pack, aiming to solve the problem that the temperature of the existing battery pack rises during use and affects the performance and life of the battery; another purpose of the embodiment of the present application is to provide an electrical device.

[0004] Technical solution: A battery pack according to an embodiment of the present application has a first direction and a second direction intersecting each other. The battery pack includes a battery cell and a thermal management component. The thermal management component includes:

[0005] A heat exchange body is arranged on one side of the battery cell, the heat exchange body comprises a plurality of heat exchange parts arranged at intervals along the second direction, the heat exchange parts are connected to the battery cell; the heat exchange parts have a heat exchange cavity;

[0006] A first current collector is arranged at one side of the heat exchange body along the first direction; the first current collector comprises a plurality of first connectors arranged at intervals along the second direction, each of the first connectors is sealed and connected to one of the heat exchange parts; the first current collector has a plurality of first channels, each of the first channels passes through one of the first connectors;

[0007] A second current collector is arranged along the first direction on a side of the heat exchange body away from the first current collector; the second current collector comprises a plurality of second connectors arranged at intervals along the second direction, each of the second connectors is sealed and connected to one of the heat exchange parts; the second current collector has a plurality of second channels, each of the second channels passes through one of the second connectors;

[0008] Wherein, the heat exchange cavity of each heat exchange part is communicated with one first channel and one second channel respectively.

[0009] In some embodiments,

[0010] The first connecting member has a first accommodating cavity, one end of the heat exchange portion along the first direction is accommodated in the first accommodating cavity, and the heat exchange portion is sealed and connected to the inner wall of the first accommodating cavity; the first accommodating cavity is respectively connected to one of the first channels and the heat exchange cavity;

[0011] The second connecting member has a second accommodating cavity, and one end of the heat exchange part away from the first connecting member along the first direction is accommodated in the second accommodating cavity. The heat exchange part is sealed and connected to the inner wall of the second accommodating cavity; the second accommodating cavity is respectively connected to one of the second channels and the heat exchange cavity.

[0012] In some embodiments, the heat exchange cavity is used to accommodate heat exchange medium, the flow directions of the heat exchange medium in two adjacent heat exchange parts are opposite, the number of the heat exchange parts is n, n>0, and n is an odd number;

[0013] The plurality of first channels include a first liquid inlet channel and (n-1) / 2 first transfer channels, and along the second direction, the (n-1) / 2 first transfer channels are arranged at intervals on the same side of the first liquid inlet channel, and each of the first transfer channels is connected to the heat exchange chambers of two adjacent heat exchange parts;

[0014] The plurality of second channels include a second liquid outlet channel and / 2 second transfer channels, and along the second direction, (n-1) / 2 second transfer channels are arranged at intervals on the same side of the second liquid outlet channel, and each second transfer channel is connected to the heat exchange chambers of two adjacent heat exchange parts;

[0015] Among them, the heat exchange chamber connected to the first liquid inlet channel is connected to one of the second transfer channels, and the heat exchange chamber connected to the second liquid outlet channel is connected to one of the first transfer channels; the first transfer channel and the second transfer channel connected to the same heat exchange chamber extend in directions away from each other.

[0016] In some embodiments, the heat exchange cavity is used to accommodate heat exchange medium, the flow directions of the heat exchange medium in two adjacent heat exchange parts are opposite, the number of the heat exchange parts is n, n>0, and n is an even number;

[0017] The plurality of first channels include a first liquid inlet channel, a first liquid outlet channel, and (n-2) / 2 first transfer channels, and along the second direction, (n-2) / 2 first transfer channels are arranged between the first liquid inlet channel and the first liquid outlet channel at intervals, and each of the first transfer channels is connected to the heat exchange chambers of two adjacent heat exchange parts;

[0018] The plurality of second channels include n / 2 second transfer channels, and the n / 2 second transfer channels are arranged at intervals along the second direction, and each of the second transfer channels is connected to the heat exchange chambers of two adjacent heat exchange parts;

[0019] Wherein, the first transfer channel and the second transfer channel communicated with the same heat exchange cavity extend in directions away from each other.

[0020] In some embodiments, the heat exchange body further includes at least one third connecting member, each of the third connecting members is disposed between two adjacent heat exchange parts along the second direction, and the third connecting members are respectively connected to the heat exchange parts on both sides.

[0021] In some embodiments, the battery pack also has a third direction intersecting with the first direction and the second direction respectively, and the heat exchange part includes two heat exchange walls arranged opposite to each other along the third direction, and the two heat exchange walls are used to enclose the heat exchange cavity; along the third direction, the heat exchange wall is connected to the battery cell; the heat exchange wall can deform into the heat exchange cavity when the battery cell expands.

[0022] In some embodiments, the heat exchange portion includes a first stopper, the first stopper is disposed in the heat exchange cavity, and the first stopper is connected to one of the two heat exchange walls.

[0023] In some embodiments, the third connecting member includes:

[0024] Two connecting pieces are arranged opposite to each other along the third direction, and along the second direction, the connecting pieces are connected to the heat exchange wall, and two adjacent heat exchange parts and the two connecting pieces form a buffer cavity; along the third direction, the connecting piece is connected to the battery cell, and the connecting piece can be deformed into the buffer cavity when the battery cell expands;

[0025] The second limiting member is disposed in the buffer cavity and connected to one of the two connecting pieces.

[0026] In some embodiments, the battery pack further has a third direction intersecting the first direction and the second direction respectively, and the heat exchange portion has a first dimension L along the third direction. 1 , along the second direction, the first dimension L 1 First it gets bigger and then it gets smaller.

[0027] Accordingly, an electrical device described in an embodiment of the present application includes a battery pack as described in any one of the aforementioned embodiments.

[0028] Beneficial effects: Compared with the prior art, a battery pack according to an embodiment of the present application has a first direction and a second direction intersecting each other, and the battery pack includes a battery cell and a thermal management component, and the thermal management component includes a heat exchange body, a first current collector, and a second current collector. The heat exchange body is arranged on one side of the battery cell, and the heat exchange body includes a plurality of heat exchange parts arranged at intervals along the second direction, and the heat exchange parts are connected to the battery cell; the heat exchange part has a heat exchange cavity. The first current collector is arranged on one side of the heat exchange body along the first direction; the first current collector includes a plurality of first connectors arranged at intervals along the second direction, and each first connector is sealed and connected to a heat exchange part. The first current collector has a plurality of first channels, and each first channel passes through a first connector. The second current collector is arranged on the side of the heat exchange body away from the first current collector along the first direction; the second current collector includes a plurality of second connectors arranged at intervals along the second direction, and each second connector is sealed and connected to a heat exchange part; the second current collector has a plurality of second channels, and each second channel passes through a second connector; wherein the heat exchange cavity of each heat exchange part is respectively connected to a first channel and a second channel. The present application sets a plurality of heat exchange parts to cooperate with the first current collector and the second current collector, so that heat exchange medium flows through the plurality of heat exchange parts for heat exchange, and effectively cools down the battery pack, thereby improving the safety and service life of the battery pack. The plurality of heat exchange parts are arranged at intervals, and are sealed and connected to the first connector of the first current collector and the second connector of the second current collector, respectively. The flow of heat exchange medium in the heat exchange cavity is achieved by means of the first channel and the second channel, which can not only ensure the heat exchange and cooling performance of the thermal management component, achieve effective heat exchange and cooling of the battery cells in the battery pack, but also effectively reduce the weight of the thermal management component; in addition, while ensuring the heat exchange effect, the volume of the heat exchange medium in the heat exchange body can be reduced, and the weight of the thermal management component can be further reduced, which is conducive to the lightweight of the battery pack.

[0029] Compared with the prior art, an electric device according to an embodiment of the present application includes a battery pack as described in any one of the above embodiments. It is understandable that the electric device according to the embodiment of the present application includes all the technical features and technical effects of the above battery pack, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 is a schematic diagram of the overall structure of a battery pack according to an embodiment of the present application;

[0032] Figure 2is an exploded view of a battery pack according to an embodiment of the present application;

[0033] Figure 3 is a side view of a battery pack according to an embodiment of the present application;

[0034] Figure 4 yes Figure 3 AA section view in;

[0035] Figure 5 is a schematic diagram of the overall structure of a thermal management component according to an embodiment of the present application;

[0036] Figure 6 is a side view of a thermal management component according to an embodiment of the present application along a third direction;

[0037] Figure 7 yes Figure 6 BB section view in;

[0038] Figure 8 is a side view of a thermal management component according to an embodiment of the present application along a second direction;

[0039] Fig. 9 yes Figure 8 CC section view in;

[0040] Fig.10 yes Fig. 9 A magnified view of part A;

[0041] Fig.11 yes Fig. 9 A magnified view of part B;

[0042] Fig.12 is a schematic diagram of the overall structure of a first current collector according to an embodiment of the present application;

[0043] Fig.13 is a schematic diagram of the overall structure of a second current collector according to an embodiment of the present application;

[0044] Fig.14 is a cross-sectional view of a first current collector having an odd number of first channels in an embodiment of the present application;

[0045] Fig.15 is a cross-sectional view of a second current collector having an odd number of second channels in an embodiment of the present application;

[0046] Fig.16 is a cross-sectional view of a first current collector having an even number of first channels in an embodiment of the present application;

[0047] Fig.17 This is a cross-sectional view of a second current collector having an even number of second channels according to an embodiment of the present application.

[0048] 1. Battery cell; 2. Thermal management component; 21. Heat exchange body; 211. Heat exchange part; 2111. Heat exchange cavity; 2112. Heat exchange wall; 2113. First stopper; 212. Third connecting member; 2121. Connecting plate; 2122. Buffer cavity; 2123. Second stopper; 22. First current collector; 221. First connecting member; 2211. First accommodating cavity; 222. First channel; 2221. First liquid inlet channel; 2222. First liquid outlet channel; 2223. First transfer channel; 23. Second current collector; 231. Second connecting member; 2311. Second accommodating cavity; 232. Second channel; 2321. Second transfer channel; 2322. Second liquid outlet channel; 24. Liquid inlet; 25. Liquid outlet; X, first direction; Y, third direction; Z, second direction. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0050] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined. In the description of this application, "vertical" means completely vertical at 90° or almost completely vertical, for example, an angle within the range of 80° to 100° is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel, for example, an angle within 10° of completely parallel is considered parallel.

[0051] It should also be noted that in the drawings of the present application, the arrow marked X indicates the first direction X, the arrow marked Y indicates the third direction Y, and the arrow marked Z indicates the second direction Z. The first direction X, the second direction Z, and the third direction Y are introduced to facilitate the description of the structural position relationship of the battery pack, and thus facilitate the understanding of its structure. In the embodiment of the present application, the first direction X is the arrangement direction of multiple battery cells, the second direction Z is the height direction of the battery cells, and the third direction Y is the arrangement direction of the battery cells and the thermal management components; and the first direction X, the second direction Z, and the third direction Y intersect with each other, and further, the first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0052] In the field of electric vehicles, battery packs play an irreplaceable role as the power source of electric vehicles. As the core part of electric vehicles, battery packs have high requirements in terms of safety and life. During the use of battery packs, the battery cells in the battery packs will generate a lot of heat during the charging and discharging process, which will cause the temperature inside the battery pack to rise, seriously affecting the performance and life of the battery. At the same time, vehicles are pursuing lightweight, which can better achieve an increase in cruising range, and reducing the weight of battery packs has always been an issue of concern to everyone.

[0053] In view of this, an embodiment of the present application provides a battery pack, aiming to solve at least one of the above-mentioned technical problems.

[0054] Please refer to Figure 1-Figure 17 A battery pack according to an embodiment of the present application has a first direction X and a second direction Z intersecting each other. The battery pack includes a battery cell 1 and a thermal management component 2. The thermal management component 2 includes a heat exchange body 21, a first current collector 22, and a second current collector 23. The heat exchange body 21 is arranged on one side of the battery cell 1. The heat exchange body 21 includes a plurality of heat exchange parts 211 arranged at intervals along the second direction Z. The heat exchange parts 211 are connected to the battery cell 1. The heat exchange parts 211 have a heat exchange cavity 2111. The first current collector 22 is arranged on one side of the heat exchange body 21 along the first direction X. The first current collector 22 includes a plurality of first connectors 221 arranged at intervals along the second direction Z. Each first connector 221 is sealed and connected to a heat exchange part 211. The first current collector 22 has a plurality of first channels 222. Each first channel 222 passes through a first connector 221. The second current collector 23 is arranged on the side of the heat exchange body 21 away from the first current collector 22 along the first direction X; the second current collector 23 includes a plurality of second connecting members 231 arranged at intervals along the second direction Z, and each second connecting member 231 is sealed and connected to a heat exchange part 211; the second current collector 23 has a plurality of second channels 232, and each second channel 232 passes through a second connecting member 231; wherein the heat exchange cavity 2111 of each heat exchange part 211 is respectively connected to a first channel 222 and a second channel 232.

[0055] In the embodiment of the present application, by setting a plurality of heat exchange parts 211 to cooperate with the first current collector 22 and the second current collector 23, a heat exchange medium flows through each of the plurality of heat exchange parts 211 for heat exchange, and effective cooling is achieved in the battery pack, thereby improving the safety and service life of the battery pack. The plurality of heat exchange parts 211 are arranged at intervals, and are sealed and connected to each other with the first connector 221 of the first current collector 22 and the second connector 231 of the second current collector 23. The flow of the heat exchange medium in the heat exchange cavity 2111 is achieved by means of the first channel 222 and the second channel 232, which can ensure the heat exchange and cooling performance of the thermal management component 2, achieve effective heat exchange and cooling of the battery cells 1 in the battery pack, and effectively reduce the weight of the thermal management component 2; in addition, while ensuring the heat exchange effect, the volume of the heat exchange medium in the heat exchange body 21 can be reduced, and the weight of the thermal management component 2 can be further reduced, which is conducive to the lightweight of the battery pack.

[0056] Specifically, in the embodiment of the present application, by setting a thermal management component 2 on one side of the battery cell 1, the battery cell 1 can be effectively cooled, the temperature of the battery cell 1 can be avoided from rising significantly, and the safety and service life of the battery pack can be ensured. Among them, the thermal management component 2 includes a heat exchange body 21, and the heat exchange body 21 includes a plurality of heat exchange parts 211, and the plurality of heat exchange parts 211 are arranged at intervals along the second direction Z, and the heat exchange part 211 has a heat exchange cavity 2111, and the heat exchange cavity 2111 is used to accommodate a heat exchange medium, and there is a temperature difference between the temperature of the heat exchange medium and the battery cell 1, so that the battery cell 1 can be cooled by heat exchange. The plurality of heat exchange parts 211 in the embodiment of the present application are arranged at intervals, and the interval cooling is correspondingly achieved, and the overall cooling of the battery cell 1 is achieved by heat transfer, which can not only ensure the effective cooling of the battery cell 1, but also effectively reduce the weight of the heat exchange body 21 relative to the liquid cooling plate in contact with the entire surface of the battery cell 1, which is conducive to the lightweight of the battery pack.

[0057] Furthermore, in the embodiment of the present application, the first connectors 221 of the first current collector 22 are arranged at intervals along the second direction Z, the second connectors 231 of the second current collector 23 are arranged at intervals along the second direction Z, and the heat exchange parts 211 arranged at intervals along the second direction Z are matched. At the same time, the first channels 222 of the first current collector 22 pass through the first connectors 221 one by one, and the second channels 232 of the second current collector 23 pass through the second connectors 231 one by one, so that each heat exchange cavity 2111 is connected with a first channel 222 and a second channel 232 respectively, and the first channel 222 and the second channel 232 are connected and connected with the external heat exchange medium circulation and conveying device, so as to realize the circulation input and output of the heat exchange medium in each heat exchange cavity 2111. The first connector 221 and the second connector 231 are respectively sealed and connected with the heat exchange part 211, which effectively prevents the heat exchange medium in the heat exchange cavity 2111 from leaking and affecting the safety inside the battery pack.

[0058] It should also be noted that there may be multiple battery cells 1 in the present application, and the multiple battery cells 1 are arranged along the first direction X. Each battery cell 1 is connected to the heat exchange part 211 for heat exchange. At this time, the heat exchange part 211 extends along the arrangement direction of the battery cells 1 to achieve simultaneous contact and heat exchange with multiple battery cells 1. At this time, the thermal management component 2 can be set at the bottom of the battery cell 1 or on the large side of the battery cell 1. When the thermal management component 2 is set on the large side of the battery cell 1, battery cells 1 can be set on both sides of the thermal management component 2, such as Figure 1-Figure 4 As shown, at this time, the heat exchange body 21 of the thermal management component 2 is arranged between two rows of battery cells 1 along the third direction Y, and performs heat exchange and cooling on the battery cells 1 on both sides respectively.

[0059] Please refer to Figure 12-Figure 17 In some embodiments, the first connector 221 has a first accommodating chamber 2211, one end of the heat exchange portion 211 along the first direction X is accommodated in the first accommodating chamber 2211, and the heat exchange portion 211 is sealed and connected to the inner wall of the first accommodating chamber 2211; the first accommodating chamber 2211 is respectively connected to a first channel 222 and the heat exchange chamber 2111. The second connector 231 has a second accommodating chamber 2311, one end of the heat exchange portion 211 away from the first connector 221 along the first direction X is accommodated in the second accommodating chamber 2311, and the heat exchange portion 211 is sealed and connected to the inner wall of the second accommodating chamber 2311; the second accommodating chamber 2311 is respectively connected to a second channel 232 and the heat exchange chamber 2111.

[0060] In the embodiment of the present application, the first connecting member 221 is provided with a first accommodating cavity 2211, and the second connecting member 231 is provided with a second accommodating cavity 2311. The first accommodating cavity 2211 and the second accommodating cavity 2311 are respectively used to accommodate the two ends of the heat exchange part 211 along the first direction X, and the heat exchange part 211 is respectively sealed with the inner wall of the first accommodating cavity 2211 and the inner wall of the second accommodating cavity 2311 to achieve wrapping and sealing of the two ends of the heat exchange part 211. At this time, the connecting passage between the first flow channel, the first accommodating cavity 2211, the heat exchange cavity 2111, the second accommodating cavity 2311 and the second flow channel is maintained, and the sealing of the passage connection is guaranteed.

[0061] It should be noted that in the embodiment of the present application, sealant can be applied on the outer walls at both ends of the heat exchange part 211, and after the heat exchange part 211 is inserted into the first accommodating cavity 2211 and the second accommodating cavity 2311, a sealed connection between the outer wall of the heat exchange part 211 and the inner wall of the first accommodating cavity 2211 and the inner wall of the second accommodating cavity 2311 can be achieved, thereby preventing the heat exchange medium from leaking at the connection between the heat exchange part 211 and the first connecting member 221 and the second connecting member 231.

[0062] It should also be noted that since the heat exchange part 211 is used to contact the battery cell 1 to exchange heat and cool the battery cell 1, when the battery cell 1 is repeatedly charged and discharged and the temperature rises, it will expand to a certain extent. At this time, the battery cell 1 will pressurize the heat exchange part 211 to cause a certain deformation of the heat exchange part 211. The present application realizes that the heat exchange part 211 has a large connection area with the first connector 221 and the second connector 231 by accommodating the two ends of the heat exchange part 211 in the first accommodating cavity 2211 and the second accommodating cavity 2311 respectively, and sealingly connecting the inner wall of the first accommodating cavity 2211 and the inner wall of the second accommodating cavity 2311 respectively, which can effectively avoid the problem of the sealing between the first connector 221 and the second connector 231 and the heat exchange part 211 being damaged due to the deformation of the heat exchange part 211.

[0063] Of course, since the first current collector 22 and the second current collector 23 are respectively located at the two ends of the heat exchange body 21 along the first direction X, the corresponding first connector 221 and the second connector 231 are respectively located at the two ends of the heat exchange portion 211, and the battery cell 1 is only in contact with the heat exchange portion 211, therefore, the corresponding first connector 221 and the second connector 231 are usually located at both sides of the battery cell 1 along the first direction X. At this time, although the heat expansion of the battery cell 1 squeezes the heat exchange portion 211 and causes the heat exchange portion 211 to deform, the deformation will be transmitted to the connection between the heat exchange portion 211 and the first connector 221 and the second connector 231, the deformation transmitted to the first connector 221 and the second connector 231 is already weak, so it is not easy to damage the sealing of the heat exchange portion 211 and the first connector 221 and the second connector 231.

[0064] Please refer to Figure 9-Figure 15 In some embodiments, the heat exchange cavity 2111 is used to accommodate heat exchange medium, and the flow directions of the heat exchange medium in two adjacent heat exchange parts 211 are opposite. The number of heat exchange parts 211 is n, n>0, and n is an odd number; the multiple first channels 222 include a first liquid inlet channel 2221 and (n-1) / 2 first transfer channels 2223. Along the second direction Z, (n-1) / 2 first transfer channels 2223 are spaced apart on the same side of the first liquid inlet channel 2221, and each first transfer channel 2223 is connected to the heat exchange cavity 2111 of two adjacent heat exchange parts 211. The multiple second channels 232 include a second liquid outlet channel 2322 and (n-1) / 2 second transfer channels 2321. Along the second direction Z, the (n-1) / 2 second transfer channels 2321 are spaced apart on the same side of the second liquid outlet channel 2322, and each second transfer channel 2321 is connected to the heat exchange chambers 2111 of two adjacent heat exchange parts 211; wherein, the heat exchange chamber 2111 connected to the first liquid inlet channel 2221 is connected to a second transfer channel 2321, and the heat exchange chamber 2111 connected to the second liquid outlet channel 2322 is connected to a first transfer channel 2223; the first transfer channel 2223 and the second transfer channel 2321 connected to the same heat exchange chamber 2111 extend in directions away from each other.

[0065] Please refer to Figure 16-Figure 17 In some embodiments, the heat exchange cavity 2111 is used to accommodate heat exchange medium, and the flow directions of the heat exchange medium in two adjacent heat exchange parts 211 are opposite. The number of heat exchange parts 211 is n, n>0, and n is an even number; the plurality of first channels 222 include a first liquid inlet channel 2221, a first liquid outlet channel 2222, and (n-2) / 2 first transfer channels 2223. Along the second direction Z, (n-2) / 2 first transfer channels 2223 are arranged between the first liquid inlet channel 2221 and the first liquid outlet channel 2222 at intervals. Each first transfer channel 2223 is connected to the heat exchange cavity 2111 of two adjacent heat exchange parts 211; the multiple second channels 232 include n / 2 second transfer channels 2321, along the second direction Z, and n / 2 second transfer channels 2321 are arranged at intervals along the second direction Z, and each second transfer channel 2321 is connected to the heat exchange cavity 2111 of two adjacent heat exchange parts 211; wherein, the first transfer channel 2223 and the second transfer channel 2321 connected to the same heat exchange cavity 2111 extend in directions away from each other.

[0066] In the embodiment of the present application, through the reasonable layout of the first channel 222 and the second channel 232, and in combination with the liquid inlet 24 and the liquid outlet 25, the heat exchange medium in the heat exchange cavity 2111 of the multiple heat exchange parts 211 can be circulated in a circuitous manner, and the heat exchange medium in two adjacent heat exchange parts 211 can flow in opposite directions, thereby achieving uniform heat exchange of the heat exchange body 21 to the multiple battery cells 1 as a whole, avoiding the temperature of the battery cells 1 on one side being lower and the temperature of the battery cells 1 on the other side being higher. Depending on the number of heat exchange parts 211, the specific layout of the first flow channel and the second flow channel is different.

[0067] Specifically, when there are an odd number of heat exchange parts 211, the liquid inlet 24 and the liquid outlet 25 are respectively disposed on the first current collector 22 and the second current collector 23. Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 9-Figure 15 As shown, the embodiment of the present application is described by taking the first current collector 22 having a liquid inlet 24 and the second current collector 23 having a liquid outlet 25 as an example. At this time, the first liquid inlet channel 2221 is used to communicate with the liquid inlet 24 and the heat exchange cavity 2111 of the heat exchange part 211 located at the edge to input heat exchange medium into the heat exchange part 211, the first transfer channel 2223 is communicated with the heat exchange cavity 2111 of two adjacent heat exchange parts 211, the first liquid outlet channel 2222 is communicated with the liquid outlet 25 and the heat exchange cavity 2111 of a heat exchange part 211 located at the other edge to lead out the heat exchange medium that has been heat exchanged in the heat exchange part 211, and the second transfer channel 2321 is respectively connected to the heat exchange cavity 2111 of the two adjacent heat exchange parts 211. The cavities 2111 are connected, wherein the heat exchange cavity 2111 of at least one heat exchange portion 211 is simultaneously connected to a first transfer channel 2223 and a second transfer channel 2321, the first transfer channel 2223 and the second transfer channel 2321 extend in directions away from each other, the first transfer channel 2223 and the second transfer channel 2321 are adjacently arranged along the first direction X, and are connected to the heat exchange cavities 2111 of the three heat exchange portions 211 arranged at intervals, thereby achieving S-shaped circuitous circulation of the heat exchange medium in the heat exchange cavities 2111 of the multiple heat exchange portions 211.

[0068] When there are an even number of heat exchange parts 211, the liquid inlet 24 and the liquid outlet 25 can be simultaneously disposed on the first current collector 22 or simultaneously disposed on the second current collector 23. Fig.16 and Fig.17As shown, the embodiment of the present application is described by taking the liquid inlet 24 and the liquid outlet 25 as being simultaneously arranged on the first current collector 22 as an example. At this time, the first liquid inlet channel 2221 is connected with the liquid inlet 24 and the heat exchange cavity 2111 of the heat exchange part 211 located at the edge to input the heat exchange medium into the heat exchange part 211, the first liquid outlet 25 is connected with the liquid outlet 25 and the heat exchange cavity 2111 of a heat exchange part 211 located at the other edge to lead out the heat exchange medium that has been heat exchanged in the heat exchange part 211, the first transfer channel 2223 is located between the first liquid inlet 24 and the first liquid outlet 25 and is connected with the heat exchange cavity 2111 of two adjacent heat exchange parts 211, and the second transfer channel 2321 is connected with the heat exchange cavity 2111 of two adjacent heat exchange parts 211. The heat exchange chambers 2111 of 211 are connected, wherein the heat exchange chamber 2111 of at least one heat exchange part 211 is simultaneously connected to a first transfer channel 2223 and a second transfer channel 2321, the first transfer channel 2223 and the second transfer channel 2321 extend in directions away from each other, the first transfer channel 2223 and the second transfer channel 2321 are adjacently arranged along the first direction X, and are connected to the heat exchange chambers 2111 of the three heat exchange parts 211 arranged at intervals, so that the heat exchange medium is realized in an S-shaped circuitous circulation in the heat exchange chambers 2111 of the multiple heat exchange parts 211.

[0069] It should be noted that the specific structures of the first transfer channel 2223 and the second transfer channel 2321 are not limited, and can be V-shaped, wavy, or C-shaped as shown in the drawings, so as to achieve the connection between two adjacent heat exchange chambers 2111.

[0070] Please refer to Figure 6 , Figure 7 , Figure 9-11 In some embodiments, the heat exchange body 21 further includes at least one third connecting member 212, each third connecting member 212 is disposed between two adjacent heat exchange parts 211 along the second direction Z, and the third connecting member 212 is respectively connected to the heat exchange parts 211 on both sides.

[0071] In the embodiment of the present application, a third connecting member 212 is provided to connect between two adjacent heat exchange parts 211 to achieve heat transfer between the two adjacent heat exchange parts 211, thereby balancing the temperature between the two adjacent heat exchange parts 211, improving the temperature uniformity of the heat exchange body 21, and achieving temperature uniformity of heat exchange with the battery cell 1.

[0072] Please refer to Figure 1 , Figure 2 , Figure 4 and Figure 7In some embodiments, the battery pack further has a third direction Y intersecting with the first direction X and the second direction Z respectively, and the heat exchange portion 211 includes two heat exchange walls 2112 arranged opposite to each other along the third direction Y, and the two heat exchange walls 2112 are used to enclose a heat exchange cavity 2111; along the third direction Y, the heat exchange wall 2112 is connected to the battery cell 1; the heat exchange wall 2112 can be deformed into the heat exchange cavity 2111 when the battery cell 1 expands.

[0073] In the embodiment of the present application, the heat exchange part 211 includes two heat exchange walls 2112 arranged opposite to each other along the third direction Y. If the heat exchange part 211 is arranged on one side of the battery cell 1, then only one heat exchange wall 2112 contacts the battery cell 1 for cooling; if the heat exchange part 211 is arranged between two adjacent battery cells 1, then the two heat exchange walls 2112 contact the battery cells 1 on both sides for cooling. Since the thermal management component 2 usually has an additional positioning and fixing structure, the heat exchange part 211 of the thermal management component 2 will be squeezed when the battery cell 1 heats up and expands, and the heat exchange wall 2112 of the embodiment of the present application can deform into the heat exchange cavity 2111 when the battery cell 1 expands, so that the expansion deformation force can be absorbed to ensure the stability of the internal structure of the battery pack.

[0074] like Figure 7 As shown, in some embodiments, the heat exchange portion 211 includes a first stopper 2113 , which is disposed in the heat exchange cavity 2111 , and the first stopper 2113 is connected to one of the two heat exchange walls 2112 .

[0075] The embodiment of the present application provides a first limiter 2113 in the heat exchange chamber 2111. When the battery or the like expands and squeezes the heat exchange wall 2112 to deform, the heat exchange wall 2112 can be supported in the heat exchange chamber 2111, thereby effectively preventing the heat exchange walls 2112 on both sides from being squeezed and partially fitted, thereby ensuring that the heat exchange medium in the heat exchange chamber 2111 can flow effectively.

[0076] like Figure 7 As shown, in some embodiments, the third connecting member 212 includes a second limiting member 2123 and two connecting sheets 2121 arranged relatively along the third direction Y; in the second direction Z, the connecting sheet 2121 is connected to the heat exchange wall 2112, and two adjacent heat exchange parts 211 and the two connecting sheets 2121 form a buffer cavity 2122; along the third direction Y, the connecting sheet 2121 is connected to the battery cell 1, and the connecting sheet 2121 can be deformed into the buffer cavity 2122 when the battery cell 1 expands; the second limiting member 2123 is arranged in the buffer cavity 2122 and is connected to one of the two connecting sheets 2121.

[0077] In the embodiment of the present application, the third connector 212 includes two connecting pieces 2121, and the two connecting pieces 2121 are connected to the heat exchange part 211 to form a buffer cavity 2122, wherein the two connecting pieces 2121 are respectively connected to the two sides of the heat exchange part 211, preferably respectively connected to a heat exchange wall 2112, at this time, the connecting piece 2121 can be in contact with the battery cell 1, and can also exchange heat with the battery cell 1, so as to achieve the heat exchange efficiency of the heat exchange body 21. At the same time, the two connecting pieces 2121 are connected to two adjacent heat exchange parts 211, and can provide two heat transfer paths between the two adjacent heat exchange parts 211, so as to achieve rapid heat exchange between the two adjacent heat exchange parts 211, and then achieve better heat exchange effect. At the same time, the buffer cavity 2122 between the two connecting pieces 2121 can provide a buffer space to absorb the deformation of the connecting piece 2121 when the battery cell 1 expands, so as to improve the uniformity of the expansion and deformation of the side wall of the battery cell 1.

[0078] Furthermore, the second limiter 2123 is disposed in the buffer cavity 2122 to limit the deformation of the connecting piece 2121 , thereby preventing the connecting piece 2121 from being excessively deformed, and further preventing the contact portion of the battery cell 1 with the connecting piece 2121 from being excessively deformed.

[0079] Please continue reading Figure 7 In some embodiments, the battery pack further has a third direction Y intersecting the first direction X and the second direction Z respectively, and the heat exchange portion 211 has a first dimension L1 along the third direction Y. Along the second direction Z, the first dimension L1 first increases and then decreases.

[0080] Specifically, in the embodiment of the present application, the two heat exchange walls 2112 of the heat exchange portion 211 may be an arc-shaped structure, in which case the distance between two adjacent heat exchange walls 2112 gradually increases from one end to the middle along the second direction Z, and then gradually decreases from the middle to the other end, that is, the entire structure first increases and then decreases along the second direction Z. At this time, when the battery cell 1 deforms and squeezes the heat exchange wall 2112, the heat exchange wall 2112 deforms toward the heat exchange cavity 2111, and the contact area with the battery cell 1 gradually increases, thereby having a larger heat exchange area and thus having a better heat exchange effect.

[0081] It should be noted that the heat exchange wall 2112 of the heat exchange portion 211 of the embodiment of the present application has the ability to deform and reset. When the battery cell 1 expands and resets, the heat exchange wall 2112 also resets and remains in contact with the battery cell 1 for heat exchange. In this case, the heat exchange wall 2112 can be made of a flexible non-metallic material, such as polyethylene, polypropylene, etc., through extrusion, blow molding or thermoforming.

[0082] Please continue reading Figure 7Further, in some embodiments, the heat exchange portion 211 has a second size L2 along the second direction Z. When n>2, along the second direction Z, the second size L2 of the plurality of heat exchange portions 211 first increases and then decreases.

[0083] In the embodiment of the present application, the size of the multiple heat exchange parts 211 arranged at intervals along the second direction Z first increases and then decreases along the second direction Z. It can be understood that the size of the heat exchange part 211 at the edge of one side along the second direction Z to the heat exchange part 211 in the middle gradually increases, and then the size of the heat exchange part 211 in the middle to the heat exchange part 211 at the edge of the other side gradually decreases. At this time, the size of the heat exchange part 211 in the middle is relatively large, and it contacts the middle part of the side of the battery cell 1. At the same time, along the second direction Z, the middle part of the battery cell 1 is more likely to expand and deform relative to the two ends of the battery cell 1. Therefore, the size of the middle heat exchange part 211 is larger, which can achieve a larger contact area with the middle part of the battery cell 1, and is also conducive to the flow of more heat exchange medium, thereby achieving a better heat exchange effect on the battery cell 1.

[0084] Accordingly, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the aforementioned embodiments.

[0085] It can be understood that the electrical device of the embodiment of the present application includes all the technical features and technical effects of the aforementioned battery pack, which will not be repeated here.

[0086] Of course, the electrical devices referred to in this application may include but are not limited to backup power supplies, electric vehicles, electric bicycles, electric motorcycles, large batteries, etc.

[0087] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0088] The above is a detailed introduction to a battery pack and an electrical device provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction and a second direction intersecting each other, and includes a battery cell and a thermal management component, wherein the thermal management component includes: A heat exchange body is arranged on one side of the battery cell, the heat exchange body comprises a plurality of heat exchange parts arranged at intervals along the second direction, the heat exchange parts are connected to the battery cell; the heat exchange parts have a heat exchange cavity; A first current collector is arranged at one side of the heat exchange body along the first direction; the first current collector comprises a plurality of first connectors arranged at intervals along the second direction, each of the first connectors is sealed and connected to one of the heat exchange parts; the first current collector has a plurality of first channels, each of the first channels passes through one of the first connectors; A second current collector is arranged along the first direction on a side of the heat exchange body away from the first current collector; the second current collector comprises a plurality of second connectors arranged at intervals along the second direction, each of the second connectors is sealed and connected to one of the heat exchange parts; the second current collector has a plurality of second channels, each of the second channels passes through one of the second connectors; Wherein, the heat exchange cavity of each heat exchange part is communicated with one first channel and one second channel respectively.

2. The battery pack according to claim 1, characterized in that: The first connecting member has a first accommodating cavity, one end of the heat exchange portion along the first direction is accommodated in the first accommodating cavity, and the heat exchange portion is sealed and connected to the inner wall of the first accommodating cavity; the first accommodating cavity is respectively connected to one of the first channels and the heat exchange cavity; The second connecting member has a second accommodating cavity, and one end of the heat exchange part away from the first connecting member along the first direction is accommodated in the second accommodating cavity. The heat exchange part is sealed and connected to the inner wall of the second accommodating cavity; the second accommodating cavity is respectively connected to one of the second channels and the heat exchange cavity.

3. The battery pack according to claim 1, characterized in that: The heat exchange cavity is used to accommodate heat exchange medium, and the flow directions of the heat exchange medium in two adjacent heat exchange parts are opposite. The number of the heat exchange parts is n, n>0, and n is an odd number; The plurality of first channels include a first liquid inlet channel and (n-1) / 2 first transfer channels, and along the second direction, the (n-1) / 2 first transfer channels are arranged at intervals on the same side of the first liquid inlet channel, and each of the first transfer channels is connected to the heat exchange chambers of two adjacent heat exchange parts; The plurality of second channels include a second liquid outlet channel and (n-1) / 2 second transfer channels, and along the second direction, the (n-1) / 2 second transfer channels are arranged at intervals on the same side of the second liquid outlet channel, and each of the second transfer channels is connected to the heat exchange chambers of two adjacent heat exchange parts; Among them, the heat exchange chamber connected to the first liquid inlet channel is connected to one of the second transfer channels, and the heat exchange chamber connected to the second liquid outlet channel is connected to one of the first transfer channels; the first transfer channel and the second transfer channel connected to the same heat exchange chamber extend in directions away from each other.

4. The battery pack according to claim 1, characterized in that: The heat exchange cavity is used to accommodate heat exchange medium, and the flow directions of the heat exchange medium in two adjacent heat exchange parts are opposite. The number of the heat exchange parts is n, n>0, and n is an even number; The plurality of first channels include a first liquid inlet channel, a first liquid outlet channel, and (n-2) / 2 first transfer channels, and along the second direction, (n-2) / 2 first transfer channels are arranged between the first liquid inlet channel and the first liquid outlet channel at intervals, and each of the first transfer channels is connected to the heat exchange chambers of two adjacent heat exchange parts; The plurality of second channels include n / 2 second transfer channels, and the n / 2 second transfer channels are arranged at intervals along the second direction, and each of the second transfer channels is connected to the heat exchange chambers of two adjacent heat exchange parts; Wherein, the first transfer channel and the second transfer channel communicated with the same heat exchange cavity extend in directions away from each other.

5. The battery pack according to claim 1, characterized in that: The heat exchange body further includes at least one third connecting member, each of which is disposed between two adjacent heat exchange parts along the second direction, and each of which is connected to the heat exchange parts on both sides.

6. The battery pack according to claim 5, characterized in that: The battery pack also has a third direction intersecting with the first direction and the second direction respectively, and the heat exchange part includes two heat exchange walls arranged opposite to each other along the third direction, and the two heat exchange walls are used to enclose the heat exchange cavity; along the third direction, the heat exchange wall is connected to the battery cell; the heat exchange wall can be deformed into the heat exchange cavity when the battery cell expands.

7. The battery pack according to claim 6, characterized in that: The heat exchange portion includes a first position-limiting member, which is disposed in the heat exchange cavity and connected to one of the two heat exchange walls.

8. The battery pack according to claim 6 or 7, characterized in that: The third connecting member comprises: Two connecting pieces are arranged opposite to each other along the third direction, and along the second direction, the connecting pieces are connected to the heat exchange wall, and two adjacent heat exchange parts and the two connecting pieces form a buffer cavity; along the third direction, the connecting piece is connected to the battery cell, and the connecting piece can be deformed into the buffer cavity when the battery cell expands; The second limiting member is disposed in the buffer cavity and connected to one of the two connecting pieces.

9. The battery pack according to any one of claims 1 to 7, characterized in that: The battery pack further has a third direction intersecting the first direction and the second direction respectively. The heat exchange portion has a first size L1 along the third direction. Along the second direction, the first size L1 increases first and then decreases.

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1-9.

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