Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, and relates to the technical field of batteries, and the battery pack comprises a plurality of battery monomers and a liquid cooling plate. The liquid cooling plate is provided with a liquid inlet, a liquid outlet and a plurality of branch flow channels; the liquid inlet and the liquid outlet are arranged at an interval; the multiple branch flow channels are arranged at intervals in the second direction, each branch flow channel is provided with multiple sub flow channels extending in the first direction, the multiple sub flow channels of the same branch flow channel are arranged at intervals in the second direction, the liquid inlet end of each branch flow channel communicates with the liquid inlet, and the liquid outlet end of each branch flow channel communicates with the liquid outlet; wherein any two branch flow channels are located at different temperature positions of the liquid cooling plate, and the number of the sub flow channels of the branch flow channels located at the higher temperature position is larger than that of the sub flow channels of the branch flow channels located at the lower temperature position. The battery pack can perform targeted heat dissipation according to the heat distribution difference of different areas of the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] In high-capacity battery packs, to improve the energy density of the battery pack, individual battery cells are usually placed on a liquid cooling plate to meet the energy and size requirements of the high-capacity battery pack. High-energy-density battery packs generate a lot of heat during charging and discharging. Therefore, the heat dissipation performance of the liquid cooling plate is crucial. In traditional high-capacity battery packs, the liquid cooling plate cannot provide targeted heat dissipation based on the differences in heat distribution in different areas of the battery pack, resulting in poor temperature uniformity of the liquid cooling plate and failing to effectively solve the problem of local overheating in the battery pack. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a battery pack that can perform targeted heat dissipation according to the differences in heat distribution in different areas of the battery pack.

[0004] This application also provides an electrical device.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a battery pack having a first direction and a second direction, the first direction and the second direction being perpendicular to each other. The battery pack includes: a plurality of battery cells; a liquid cooling plate, the plurality of battery cells being arranged on the liquid cooling plate along the first direction and the second direction, the liquid cooling plate having an inlet, an outlet, and a plurality of branch channels; the inlet and the outlet being spaced apart; the plurality of branch channels being spaced apart along the second direction, each branch channel having a plurality of sub-channels extending along the first direction, and the plurality of sub-channels of the same branch channel being spaced apart along the second direction, the inlet end of each branch channel being connected to the inlet, and the outlet end of each branch channel being connected to the outlet; wherein any two branch channels are located at different temperature positions on the liquid cooling plate, and the number of sub-channels of the branch channel located at the higher temperature position is greater than the number of sub-channels of the branch channel located at the lower temperature position.

[0007] In an optional embodiment, the battery cell includes a battery body and a terminal post. The terminal post is connected to one side of the battery body. In each battery cell, at least one adjacent side of the side where the terminal post is located is in contact with the liquid cooling plate, and the side where the terminal post is located is disposed towards the edge of the liquid cooling plate along the second direction. The liquid inlet is disposed at one end of the liquid cooling plate along the first direction. The liquid cooling plate is also provided with a liquid inlet channel. The liquid inlet channel surrounds the outside of a plurality of branch channels along the first direction and the second direction, and is disposed at the edge of the liquid cooling plate. The liquid inlet end and the liquid outlet end of the liquid inlet channel are both located at the same end of the liquid cooling plate along the first direction as the liquid inlet, and the liquid inlet end of the liquid inlet channel is connected to the liquid inlet. The liquid inlet end of each branch channel is connected to the liquid outlet end of the liquid inlet channel.

[0008] In an optional embodiment, the liquid outlet and the liquid inlet are spaced apart along the second direction, and the liquid outlet and the liquid inlet are located at the same end of the liquid cooling plate along the first direction; the liquid cooling plate is also provided with multiple branch channels, which are spaced apart along the second direction. The liquid inlet end of each branch channel is connected to the liquid outlet end of the liquid inlet channel, and the branch channels extend along the first direction away from the liquid inlet. The liquid outlet end of each branch channel is connected to the liquid inlet end of a branch channel, and each branch channel extends from the liquid outlet end of the branch channel along the first direction towards the liquid outlet. In any two adjacent branch channels, in the first direction, the flow area of ​​the branch channel with a larger distance between its liquid outlet end and the liquid inlet is greater than the flow area of ​​the branch channel with a smaller distance between its liquid outlet end and the liquid inlet.

[0009] In an optional embodiment, the liquid cooling plate is further provided with a collection channel, which is spaced apart from the liquid inlet along the second direction and located at the same end of the liquid cooling plate along the first direction. The liquid outlet of the liquid inlet channel and the liquid inlet of each of the branch channels are connected to the collection channel.

[0010] In an optional embodiment, the branch channel is provided with a first connecting channel and a second connecting channel. The inlet end of the first connecting channel is connected to the collecting channel and extends along the first direction. The inlet end of the second connecting channel is connected to the outlet end of the first connecting channel and extends along the second direction away from the collecting channel. The inlet end of each branch channel is connected to the outlet end of the second connecting channel.

[0011] In an optional embodiment, multiple first connecting channels are spaced apart along the second direction and are all spaced apart from the liquid inlet channel along the second direction; multiple second connecting channels are spaced apart along the first direction and are all spaced apart from the collection channel along the first direction; wherein, in any two adjacent first connecting channels, the flow area of ​​the first connecting channel connected to the second connecting channel away from the collection channel is greater than the flow area of ​​the first connecting channel connected to the second connecting channel close to the collection channel.

[0012] In an optional embodiment, the liquid cooling plate has multiple liquid inlet channels, which are spaced apart. Each liquid inlet channel surrounds multiple branch channels along the first direction and the second direction. The liquid inlet end of each liquid inlet channel is connected to the liquid inlet port, and the liquid outlet end of each liquid inlet channel is connected to the collecting channel.

[0013] In an optional embodiment, the liquid cooling plate is further provided with a liquid outlet channel, one end of which is connected to the liquid outlet end of each of the branch channels, and the other end of which is connected to the liquid outlet.

[0014] In an optional implementation, among the multiple branch channels, the branch channel closest to the edge of the liquid cooling plate extending in the first direction has the largest number of sub-channels.

[0015] In an optional implementation, in any one of the branch channels, the number of its sub-channels is n, satisfying: n≥3.

[0016] Secondly, this application provides an electrical device, including a battery pack as described in any of the foregoing embodiments.

[0017] The battery pack of this application has the following advantages:

[0018] In the battery pack of this application, multiple battery cells can be arranged on a liquid cooling plate along a first direction and a second direction to dissipate heat from the battery cells. In the liquid cooling plate, since the inlet end of each branch channel is connected to the inlet port and the outlet end of each branch channel is connected to the outlet port, the coolant can sequentially flow through the inlet port, multiple branch channels, and the outlet port to dissipate heat from the battery cells through the coolant in the multiple branch channels. Since the multiple branch channels are spaced apart along the second direction, and each branch channel has multiple sub-channels extending along the first direction, and the multiple sub-channels of the same branch channel are spaced apart along the second direction, the liquid cooling plate can dissipate heat from the battery cells. Multiple sub-channels extending along the first direction are arranged at intervals in the second direction to ensure that the liquid cooling plate has heat exchange capacity at all points. Since any two sets of branch channels are located at different temperature positions of the liquid cooling plate, and the number of sub-channels in the branch channels located at higher temperature positions is greater than the number of sub-channels in the branch channels located at lower temperature positions, the flow rate of coolant at higher temperature positions is increased, while the flow rate of coolant at lower temperature positions is decreased. This targeted distribution of coolant flow rate results in better heat dissipation at higher temperature positions, thereby improving the temperature uniformity of the liquid cooling plate. In this way, the battery pack of this application can perform targeted heat dissipation according to the differences in heat distribution in different areas. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A three-dimensional structural schematic diagram of the battery pack in this application is shown;

[0021] Figure 2 A three-dimensional structural schematic diagram of the liquid cooling plate in this application is shown;

[0022] Figure 3 The schematic diagrams of the branch flow channel, tributary flow channel and liquid outlet flow channel in this application are shown.

[0023] Figure 4 A schematic diagram of the structure of the collection channel, the branch channel, the tributary channel, and the liquid outlet channel in this application is shown.

[0024] Figure 5 The schematic diagram of the liquid inlet channel and the liquid collection channel in this application is shown;

[0025] Figure 6A schematic diagram of the planar structure of the liquid cooling plate in this application is shown;

[0026] Figure 7 An exploded structural diagram of the liquid cooling plate in this application is shown.

[0027] Explanation of key component symbols:

[0028] 100 - Battery cell; 110 - Battery body; 120 - Terminal post;

[0029] 200-Liquid cooling plate; 210-Liquid inlet; 220-Liquid outlet; 230-Branch channel; 231-Sub-channel; 232-First branch channel; 233-Second branch channel; 234-Third branch channel; 240-Liquid inlet channel; 241-First inlet channel; 242-Second inlet channel; 250-Branch channel; 251-First connecting channel; 252-Second connecting channel; 253-First branch channel; 254-Second branch channel; 255-Third branch channel; 260-Collecting channel; 270-Liquid outlet channel; 201-First edge; 202-Second edge; 203-Third edge; 204-Fourth edge; 205-Plate body; 206-Cover plate;

[0030] x - First direction; y - Second direction. Detailed Implementation

[0031] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0032] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, the battery pack involved in the embodiments of this application has a first direction x and a second direction y, the first direction x and the second direction y are perpendicular to each other, and the battery pack includes: a plurality of battery cells 100 and a liquid cooling plate 200.

[0037] Specifically, multiple battery cells 100 are arranged on a liquid cooling plate 200 along a first direction x and a second direction y. The liquid cooling plate 200 is provided with an inlet 210, an outlet 220, and multiple branch channels 230. The inlet 210 and the outlet 220 are spaced apart. The multiple branch channels 230 are spaced apart along the second direction y. Each branch channel 230 is provided with multiple sub-channels 231 extending along the first direction x. Sub-channels 231 are spaced apart along the second direction y. The liquid inlet end of each branch channel 230 is connected to the liquid inlet 210, and the liquid outlet end of each branch channel 230 is connected to the liquid outlet 220. Any two branch channels 230 are located at different temperature positions of the liquid cooling plate 200, and the number of sub-channels 231 of the branch channel 230 located at the higher temperature position is greater than the number of sub-channels 231 of the branch channel 230 located at the lower temperature position.

[0038] It should be noted that the first direction x is Figure 1 The direction indicated by x in the middle, and the second direction y is... Figure 1 The direction indicated by y in the middle.

[0039] It should be noted that when multiple battery cells 100 are placed on the liquid cooling plate 200, the different heating conditions at different locations of the battery cells 100 will result in different temperatures at different locations of the liquid cooling plate 200.

[0040] In the battery pack of this application, multiple battery cells 100 can be arranged on a liquid cooling plate 200 along a first direction x and a second direction y to dissipate heat from the battery cells 100. In the liquid cooling plate 200, since the inlet end of each branch channel 230 is connected to the inlet 210 and the outlet end of each branch channel 230 is connected to the outlet 220, the coolant can flow sequentially through the inlet 210, the multiple branch channels 230, and the outlet 220 to dissipate heat from the battery cells 100 through the coolant in the multiple branch channels 230. Since the multiple branch channels 230 are spaced apart along the second direction y, each branch channel 230 has multiple sub-channels 231 extending along the first direction x, and the multiple sub-channels 231 of the same branch channel 230 are spaced apart along the second direction y. In this configuration, multiple sub-channels 231 extending along the first direction x are arranged at intervals along the second direction y on the liquid cooling plate 200, ensuring that all parts of the liquid cooling plate 200 have heat exchange capacity. Since any two sets of branch channels 230 are located at different temperature positions of the liquid cooling plate 200, and the number of sub-channels 231 in the branch channel 230 located at higher temperature positions is greater than the number of sub-channels 231 in the branch channel 230 located at lower temperature positions, the flow rate of coolant at higher temperature positions is greater, and the flow rate of coolant at lower temperature positions is smaller. This allows for targeted distribution of coolant flow rate, resulting in better heat dissipation at higher temperature positions and improved temperature uniformity of the liquid cooling plate 200. Thus, the battery pack of this application can perform targeted heat dissipation based on the differences in heat distribution in different areas.

[0041] Reference Figure 1 as well as Figure 2 As shown, the battery cell 100 includes a battery body 110 and a terminal post 120. The terminal post 120 is connected to one side of the battery body 110. In each battery cell 100, at least one adjacent side of the side containing the terminal post 120 is in contact with the liquid cooling plate 200, and the side containing the terminal post 120 is disposed along the second direction y toward the edge of the liquid cooling plate 200. A liquid inlet 210 is disposed at one end of the liquid cooling plate 200 along the first direction x. The liquid cooling plate 200 is also provided with an inlet... Liquid flow channel 240, the liquid inlet flow channel 240 is arranged around the outside of multiple branch flow channels 230 along the first direction x and the second direction y, and is set at the edge of liquid cooling plate 200. The liquid inlet end and the liquid outlet end of the liquid inlet flow channel 240 are located at the same end of the liquid cooling plate 200 along the first direction x with the liquid inlet 210, and the liquid inlet end of the liquid inlet flow channel 240 is connected to the liquid inlet 210. The liquid inlet end of each branch flow channel 230 is connected to the liquid outlet end of the liquid inlet flow channel 240.

[0042] In this embodiment, since at least one adjacent surface of the terminal post 120 is in contact with the liquid cooling plate 200, and the surface of the terminal post 120 is arranged along the second direction y toward the edge of the liquid cooling plate 200, the battery cell 100 can be placed sideways on the liquid cooling plate 200, thus achieving sideways contact between the battery cell 100 and the liquid cooling plate 200. Compared to placing the battery cell 100 upright (terminal post 120 facing upwards), sideways placement reduces the space occupied by the battery pack in the height direction. This is very advantageous for height-sensitive applications (such as electric vehicle chassis, energy storage cabinets, etc.). Battery packs with sideways-placed battery cells 100 are easier to integrate with other devices, facilitating the formation of a compact system layout. For example, multiple battery packs with sideways-placed battery cells 100 can be stacked side by side, making full use of limited space. Since the liquid inlet end of the liquid inlet channel 240 is connected to the liquid inlet port 210, each... The inlet ends of the branch channels 230 are all connected to the outlet ends of the inlet channels 240. In this way, the inlet port 210 can be connected to multiple branch channels 230 through the inlet channels 240, so that the coolant can flow through the inlet channels 240 to the multiple branch channels 230. In the battery cell 100, the location of the terminal post 120 is usually where current enters and exits, which generates a lot of heat. Since the inlet channels 240 are arranged along the first direction x and the second direction y around the outside of the multiple branch channels 230 and are located at the edge of the liquid cooling plate 200, the coolant in the inlet channels 240 can flow through the location of each terminal post 120, thereby improving the heat dissipation effect of the terminal post 120 of the battery cell 100, thus achieving targeted heat dissipation at the location of the terminal post 120 and improving the heat dissipation effect of the battery pack.

[0043] Specifically, refer to Figure 2 as well as Figure 3As shown, in this embodiment, the liquid cooling plate 200 has a first edge 201, a second edge 202, a third edge 203, and a fourth edge 204. The first edge 201 and the third edge 203 are two edges of the liquid cooling plate 200 spaced apart along the second direction y, and both the first edge 201 and the third edge 203 extend along the first direction x. The second edge 202 and the fourth edge 204 are two edges of the liquid cooling plate 200 spaced apart along the first direction x, and both the second edge 202 and the fourth edge 204 extend along the second direction y. The liquid inlet 210 is located near the fourth edge 204. The battery pack includes two rows of battery cells 100 groups. The battery cells 100 groups are spaced apart along the second direction y, and each row of battery cells 100 groups includes multiple battery cells 100 arranged along the first direction x. The terminals 120 of the battery cells 100 in one row of battery cells 100 groups are positioned close to and towards the first edge 201, and the terminals 120 of the battery cells 100 in another row of battery cells 100 groups are positioned close to and towards the third edge 203. The liquid inlet channel 240 extends from the liquid inlet 210 along the first edge 201, the second edge 202, and the third edge 203, so as to dissipate heat at the location of each terminal 120 through the coolant in the liquid inlet channel 240, thereby improving the heat dissipation effect of the battery pack.

[0044] Reference Figure 2 as well as Figure 4 As shown, the liquid outlet 220 and the liquid inlet 210 are spaced apart along the second direction y, and the liquid outlet 220 and the liquid inlet 210 are located at the same end of the liquid cooling plate 200 along the first direction x; the liquid cooling plate 200 is also provided with multiple diversion channels 250, which are spaced apart along the second direction y. The liquid inlet end of each diversion channel 250 is connected to the liquid outlet end of the liquid inlet channel 240, and the diversion channel 250 extends along the first direction x in a direction away from the liquid inlet 210. The outlet end of each branch channel 250 is connected to the inlet end of a branch channel 230. Each branch channel 230 extends from the outlet end of the branch channel 250 in the first direction x toward the outlet 220. In any two adjacent branch channels 250, in the first direction x, the flow area of ​​the branch channel 250 with a larger distance between its outlet end and the inlet 210 is greater than that of the branch channel 250 with a smaller distance between its outlet end and the inlet 210.

[0045] In this embodiment, since the inlet end of each branch channel 250 is connected to the outlet end of the inlet channel 240, and the outlet end of each branch channel 250 is connected to the inlet end of a branch channel 230, the coolant in the inlet channel 240 can be diverted into multiple branch channels 250, thereby distributing the coolant into multiple branch channels 230. Extending along the first direction x toward a direction away from the liquid inlet 210, the liquid inlet channel 240 located at the third edge 203 combines with multiple branch channels 250 to form a combined channel at the third edge 203. This combined channel dissipates heat from the location of the electrode post 120 facing the third edge 203, thus providing targeted heat dissipation and improving the heat dissipation effect of the battery pack. Furthermore, since each branch channel 230 extends from the liquid outlet end of the branch channel 250 along the first direction x toward a direction closer to the liquid outlet 220, each branch channel 230 extends along the first direction x from one end away from the liquid inlet 210 to one end closer to the liquid inlet 210. This allows the branch channels 230 to dissipate heat from each battery cell 100 arranged along the first direction x. In the flow channel 250, in the first direction x, since the flow area of ​​the branch flow channel 250 with a larger distance between the liquid outlet and the liquid inlet 210 is larger than that of the branch flow channel 250 with a smaller distance between the liquid outlet and the liquid inlet 210, the flow rate of the coolant in the branch flow channel 250 with a larger distance between the liquid outlet and the liquid inlet 210 can be increased, so as to balance the coolant inflow flow at the liquid inlet of the multiple branch flow channels 230 and improve the temperature uniformity of the liquid cooling plate 200.

[0046] Reference Figure 4 as well as Figure 5 As shown, the liquid cooling plate 200 is also provided with a flow collection channel 260. The flow collection channel 260 and the liquid inlet 210 are spaced apart along the second direction y, and are located at the same end of the liquid cooling plate 200 along the first direction x. The liquid outlet end of the liquid inlet channel 240 and the liquid inlet end of each branch channel 250 are connected to the flow collection channel 260.

[0047] In this embodiment, since the collecting channel 260 and the liquid inlet 210 are spaced apart along the second direction y and are located at the same end of the liquid cooling plate 200 along the first direction x, and the outlet end of the liquid inlet channel 240 is connected to the collecting channel 260, the liquid inlet channel 240 can extend from the liquid inlet 210 along the first direction x and the second direction y to the first edge 201, the second edge 202, and the third edge 203, thereby allowing the coolant in the liquid inlet channel 240 to... The coolant flows through the first edge 201, the second edge 202, and the third edge 203, thereby improving the heat dissipation effect on the edges of the liquid cooling plate 200 and improving the heat dissipation effect at the location of the terminal post 120 of the battery cell 100. Since the inlet end of each branch channel 250 is connected to the collector channel 260, the coolant in the inlet channel 240 can be distributed to multiple branch channels 250 through the collector channel 260, thereby achieving a reasonable distribution of coolant in the liquid cooling plate 200.

[0048] Reference Figure 2 as well as Figure 5 As shown, the liquid cooling plate 200 has multiple liquid inlet channels 240, which are spaced apart. Each liquid inlet channel 240 is arranged around multiple branch channels 250 along the first direction x and the second direction y. The liquid inlet end of each liquid inlet channel 240 is connected to the liquid inlet 210, and the liquid outlet end of each liquid inlet channel 240 is connected to the collection channel 260.

[0049] In this embodiment, the heat dissipation effect on the edge of the liquid cooling plate 200 can be improved by multiple liquid inlet channels 240. At the same time, multiple liquid inlet channels 240 and multiple branch channels 250 can be combined to form a third edge 203 combined channel, so as to dissipate heat to the location of the pole post 120 facing the third edge 203 through the third edge 203 combined channel, thereby providing targeted heat dissipation to the location of the pole post 120 facing the third edge 203. Since the liquid outlet of each liquid inlet channel 240 is connected to the collection channel 260, the coolant in the multiple liquid inlet channels 240 can be distributed to multiple branch channels 250 according to the flow rate requirements through the collection channel 260, so that the coolant can be reasonably distributed among multiple branch channels 230.

[0050] Reference Figure 3As shown, the branch channel 250 is provided with a first connecting channel 251 and a second connecting channel 252. The inlet end of the first connecting channel 251 is connected to the collecting channel 260 and the first connecting channel 251 extends along the first direction x. The inlet end of the second connecting channel 252 is connected to the outlet end of the first connecting channel 251 and the second connecting channel 252 extends along the second direction y in a direction away from the collecting channel 260. The inlet end of each branch channel 230 is connected to the outlet end of the second connecting channel 252.

[0051] In this embodiment, the coolant in the collecting channel 260 flows sequentially through the first connecting channel 251 and the second connecting channel 252 into the branch channel 230. Since the first connecting channel 251 extends along the first direction x, multiple first connecting channels 251 and multiple liquid inlet channels 240 can be combined to form a third edge 203 combined channel. The third edge 203 combined channel dissipates heat at the location of the pole post 120 facing the third edge 203, thereby providing targeted heat dissipation at the location of the pole post 120 facing the third edge 203. Since the second connecting channel 252 extends along the second direction y in a direction away from the collecting channel 260, the length of each branch channel 250 can be adjusted so that each branch channel 230 is located at a different position on the liquid cooling plate 200 along the second direction y. This allows multiple branch channels 230 to be spaced apart along the second direction y, ensuring that all parts of the liquid cooling plate 200 have heat exchange capacity.

[0052] Reference Figure 3 as well as Figure 4 As shown, multiple first connecting channels 251 are spaced apart along the second direction y, and are all spaced apart from the liquid inlet channel 240 along the second direction y. Multiple second connecting channels 252 are spaced apart along the first direction x, and are all spaced apart from the collection channel 260 along the first direction x. Among any two adjacent first connecting channels 251, the flow area of ​​the first connecting channel 251 connected to the second connecting channel 252 away from the collection channel 260 is greater than the flow area of ​​the first connecting channel 251 connected to the second connecting channel 252 close to the collection channel 260.

[0053] In this embodiment, since each first connecting channel 251 is spaced apart from the liquid inlet channel 240 along the second direction y, and multiple second connecting channels 252 are spaced apart along the first direction x, the distances between the multiple second connecting channels 252 and the collecting channel 260 in the first direction x are different. In any two adjacent first connecting channels 251, since the flow area of ​​the first connecting channel 251 connected to the second connecting channel 252 far from the collecting channel 260 is larger than the flow area of ​​the first connecting channel 251 connected to the second connecting channel 252 close to the collecting channel 260, the coolant flow rate in the first connecting channel 251 connected to the second connecting channel 252 far from the collecting channel 260 can be increased, so as to balance the coolant flow rate in the multiple second connecting channels 252, thereby balancing the coolant flow rate in the multiple branch channels 230 and improving the temperature uniformity of the liquid cooling plate 200.

[0054] Specifically, in this embodiment, in the first direction x, the flow area of ​​the second connecting channel 252 with a larger distance from the collecting channel 260 is greater than the flow area of ​​the second connecting channel 252 with a smaller distance from the collecting channel 260, so as to further balance the coolant flow in the multiple branch channels 230 and improve the temperature uniformity of the liquid cooling plate 200.

[0055] Reference Figure 4 As shown, among the multiple branch channels 230, the branch channel 230 closest to the edge of the liquid cooling plate 200 extending along the first direction x has the largest number of sub-channels 231.

[0056] In this embodiment, since the branch channel 230 closest to the edge of the liquid cooling plate 200 extending along the first direction x has the largest number of sub-channels 231, the branch channel 230 closest to the edge of the liquid cooling plate 200 extending along the first direction x can have the largest coolant flow rate, thereby improving the heat exchange capacity of the branch channel 230 and thus improving the heat dissipation effect at the location of the pole post 120.

[0057] Specifically, in this embodiment, among the multiple branch channels 230, the branch channel 230 closest to the first edge 201 has the most sub-channels 231. At the third edge 203, the combined channel formed by the combination of multiple inlet channels 240 and multiple branch channels 250 at the third edge 203 can dissipate heat at the location of the pole post 120 facing the third edge 203, thereby providing targeted heat dissipation at the location of the pole post 120 facing the third edge 203. At edge 201, multiple liquid inlet channels 240 and the branch channel 230 closest to the first edge 201 can dissipate heat to the location of the pole post 120 facing the first edge 201, thereby providing targeted heat dissipation to the location of the pole post 120 facing the first edge 201. Since the branch channel 230 closest to the first edge 201 has the most sub-channels 231, the heat dissipation effect at the location of the pole post 120 facing the first edge 201 can be improved.

[0058] Reference Figure 4 As shown, in any branch channel 230, the number of its sub-channels 231 is n, satisfying: n≥3.

[0059] Specifically, in this embodiment, n can be 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0060] In this embodiment, if the number of sub-channels 231 n<3 in any branch channel 230, the number of sub-channels 231 in the branch channel 230 will be too small. As a result, the distance between any two sub-channels 231 in the second direction y will be too large, which will reduce the cooling effect of the area between any two sub-channels 231 and thus reduce the overall cooling effect of the liquid cooling plate 200. When the number of sub-channels 231 n≥3 in any branch channel 230, the distance between any two sub-channels 231 in the second direction y can meet the cooling requirements of the liquid cooling plate 200 for the battery cell 100.

[0061] Reference Figure 3 as well as Figure 4 As shown, the liquid cooling plate 200 is also provided with a liquid outlet channel 270. One end of the liquid outlet channel 270 is connected to the liquid outlet end of each branch channel 230, and the other end of the liquid outlet channel 270 is connected to the liquid outlet 220.

[0062] In this embodiment, since one end of the outlet channel 270 is connected to the outlet end of each branch channel 230 and the other end of the outlet channel 270 is connected to the outlet port 220, the coolant in the multiple branch channels 230 can be merged through the outlet channel 270, so that the coolant in the multiple branch channels 230 can flow more smoothly to the outlet port 220, thereby improving the circulation efficiency of the coolant.

[0063] Reference Figure 6 As shown, in this embodiment, the liquid inlet channel 240 includes a first liquid inlet channel 241 and a second liquid inlet channel 242. The liquid inlet end of the first liquid inlet channel 241 and the liquid inlet end of the second liquid inlet channel 242 are both connected to the liquid inlet 210. The liquid outlet end of the first liquid inlet channel 241 and the liquid outlet end of the second liquid inlet channel 242 are both connected to the collection channel 260. The first liquid inlet channel 241 and the second liquid inlet channel 242 extend along the first direction x and the second direction y to the first edge 201, the second edge 202 and the third edge 203, respectively. The first liquid inlet channel 241 is located closer to the edge of the liquid cooling plate 200 than the second liquid inlet channel 242.

[0064] The branch channel 250 includes a first branch channel 253, a second branch channel 254, and a third branch channel 255. The sub-branch channel 230 includes a first sub-branch channel 232, a second sub-branch channel 233, and a third sub-branch channel 234. The inlet ends of the first branch channel 253, the second branch channel 254, and the third branch channel 255 are all connected to the collecting channel 260. The liquid outlet of channel 253 is connected to the liquid inlet of the first branch channel 232, the liquid outlet of the second branch channel 254 is connected to the liquid inlet of the second branch channel 233, the liquid outlet of the third branch channel 255 is connected to the liquid inlet of the third branch channel 234, and the liquid outlets of the first branch channel 232, the second branch channel 233, and the third branch channel 234 are all connected to the liquid outlet channel 270.

[0065] The first diversion channel 253 is located closest to the third edge 203, and the second diversion channel 254 is located between the first diversion channel 253 and the third diversion channel 255. In the first direction x, the distance between the second connecting channel 252 of the first diversion channel 253 and the collecting channel 260 is the largest. The second connecting channel 252 of the second diversion channel 254 is located between the second connecting channel 252 of the first diversion channel 253 and the second connecting channel 252 of the third diversion channel 255. The flow area of ​​the first diversion channel 253 is larger than the flow area of ​​the second diversion channel 254, and the flow area of ​​the second diversion channel 254 is larger than the flow area of ​​the third diversion channel 255.

[0066] The first branch flow channel 232 is located closest to the first edge 201, and the first branch flow channel 232 has the most sub-flow channels 231, so that the location of the terminal post 120 of the battery cell 100 can have a better cooling effect and improve the temperature uniformity of the liquid cooling plate 200.

[0067] Reference Figure 7As shown, in this embodiment, the liquid cooling plate 200 includes a plate body 205 and a cover plate 206. The liquid inlet 210, liquid outlet 220, branch flow channel 230, liquid inlet flow channel 240, diversion flow channel 250, collection flow channel 260 and outlet flow channel are all formed on the plate body 205 by stamping. The cover plate 206 is placed on the plate body 205 to form a closed branch flow channel 230, liquid inlet flow channel 240, diversion flow channel 250, collection flow channel 260 and outlet flow channel between the plate body 205 and the cover plate 206, so that the coolant can flow between the channels and the coolant leakage can be avoided.

[0068] The electrical device involved in the embodiments of this application includes: the battery pack described above.

[0069] In the electrical device of this application, since the battery pack can dissipate heat in a targeted manner according to the differences in heat distribution in different areas, the electrical device of this application has good heat dissipation capacity, long service life and high safety in use.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery pack, characterized in that, Having a first direction (x) and a second direction (y), wherein the first direction (x) and the second direction (y) are perpendicular to each other, the battery pack includes: Multiple battery cells (100); A liquid cooling plate (200) is provided, and a plurality of battery cells (100) are arranged on the liquid cooling plate (200) along the first direction (x) and the second direction (y). The liquid cooling plate (200) is provided with a liquid inlet (210), a liquid outlet (220) and a plurality of branch flow channels (230). The inlet (210) and the outlet (220) are spaced apart; Multiple branch channels (230) are spaced apart along the second direction (y), and each branch channel (230) is provided with multiple sub-channels (231) extending along the first direction (x). The multiple sub-channels (231) of the same branch channel (230) are spaced apart along the second direction (y). The liquid inlet end of each branch channel (230) is connected to the liquid inlet (210), and the liquid outlet end of each branch channel (230) is connected to the liquid outlet (220). In this case, any two of the branch channels (230) are located at different temperature positions of the liquid cooling plate, and the number of sub-channels (231) of the branch channel (230) located at the higher temperature position is greater than the number of sub-channels (231) of the branch channel (230) located at the lower temperature position.

2. The battery pack according to claim 1, characterized in that, The battery cell (100) includes a battery body (110) and a terminal (120). The terminal (120) is connected to one side of the battery body (110). In each battery cell (100), at least one adjacent side of the side where the terminal (120) is located is in contact with the liquid cooling plate (200), and the side where the terminal (120) is located is disposed towards the edge of the liquid cooling plate (200) along the second direction (y). The liquid inlet (210) is located at one end of the liquid cooling plate (200) along the first direction (x). The liquid cooling plate (200) is also provided with a liquid inlet channel (240). The liquid inlet channel (240) surrounds the outside of the multiple branch channels (230) along the first direction (x) and the second direction (y) and is located at the edge of the liquid cooling plate (200). The liquid inlet end and the liquid outlet end of the liquid inlet channel (240) are located at the same end of the liquid cooling plate (200) along the first direction (x) as the liquid inlet (210). The liquid inlet end of the liquid inlet channel (240) is connected to the liquid inlet (210). The liquid inlet end of each branch channel (230) is connected to the liquid outlet end of the liquid inlet channel (240).

3. The battery pack according to claim 2, characterized in that, The liquid outlet (220) and the liquid inlet (210) are spaced apart along the second direction (y), and the liquid outlet (220) and the liquid inlet (210) are located at the same end of the liquid cooling plate (200) along the first direction (x); The liquid cooling plate (200) is also provided with multiple branch channels (250), which are spaced apart along the second direction (y). The liquid inlet of each branch channel (250) is connected to the liquid outlet of the liquid inlet channel (240), and the branch channels (250) extend along the first direction (x) toward the direction away from the liquid inlet (210). The liquid outlet of each branch channel (250) is connected to the liquid inlet of a branch channel (230), and each branch channel (230) extends from the liquid outlet of the branch channel (250) along the first direction (x) toward the direction close to the liquid outlet (220). In any two adjacent diversion channels (250), in the first direction (x), the diversion channel (250) with a larger distance between the liquid outlet and the liquid inlet (210) has a larger flow area than the diversion channel (250) with a smaller distance between the liquid outlet and the liquid inlet (210).

4. The battery pack according to claim 3, characterized in that, The liquid cooling plate (200) is also provided with a collection channel (260), which is spaced apart from the liquid inlet (210) along the second direction (y) and located at the same end of the liquid cooling plate (200) along the first direction (x). The liquid outlet of the liquid inlet channel (240) and the liquid inlet of each of the branch channels (250) are connected to the collection channel (260).

5. The battery pack according to claim 4, characterized in that, The branch channel (250) is provided with a first connecting channel (251) and a second connecting channel (252). The inlet end of the first connecting channel (251) is connected to the collecting channel (260), and the first connecting channel (251) extends along the first direction (x). The inlet end of the second connecting channel (252) is connected to the outlet end of the first connecting channel (251), and the second connecting channel (252) extends along the second direction (y) away from the collecting channel (260). The inlet end of each branch channel (230) is connected to the outlet end of the second connecting channel (252).

6. The battery pack according to claim 5, characterized in that, Multiple first connecting channels (251) are spaced apart along the second direction (y) and are all spaced apart from the liquid inlet channel (240) along the second direction (y). Multiple second connecting channels (252) are spaced apart along the first direction (x) and are all spaced apart from the collection channel (260) along the first direction (x). Among any two adjacent first connecting channels (251), the flow area of ​​the first connecting channel (251) connected to the second connecting channel (252) that is far away from the collecting channel (260) is greater than the flow area of ​​the first connecting channel (251) connected to the second connecting channel (252) that is close to the collecting channel (260).

7. The battery pack according to claim 4, characterized in that, The liquid cooling plate (200) has multiple liquid inlet channels (240), which are spaced apart. Each liquid inlet channel (240) surrounds multiple branch channels (250) along the first direction (x) and the second direction (y). The liquid inlet end of each liquid inlet channel (240) is connected to the liquid inlet (210), and the liquid outlet end of each liquid inlet channel (240) is connected to the collection channel (260).

8. The battery pack according to claim 3, characterized in that, The liquid cooling plate (200) is also provided with a liquid outlet channel (270), one end of which is connected to the liquid outlet end of each of the branch channels (230), and the other end of which is connected to the liquid outlet (220).

9. The battery pack according to claim 2, characterized in that, Among the multiple branch channels (230), the sub-channels (231) of the branch channel (230) closest to the edge of the liquid cooling plate (200) extending along the first direction (x) have the largest number of channels.

10. The battery pack according to claim 1, characterized in that, In any of the branch channels (230), the number of its sub-channels (231) is n, satisfying: n≥3.

11. An electrical appliance, characterized in that, include: The battery pack as described in any one of claims 1-9.

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