Liquid cooling plate and battery pack

Abstract

The utility model relates to a liquid cooling plate and a battery pack, the liquid cooling plate comprises a middle flow channel area and peripheral flow channel areas, the middle flow channel area is provided with a liquid outlet, and the peripheral flow channel areas are arranged on the two sides of the middle flow channel area in the first direction. Each peripheral flow channel comprises an inner drainage channel, an outer drainage channel, a liquid inlet, a first branch flow channel and a second branch flow channel, and the first sub-runner and the second sub-runner independently converge to the middle runner area and are communicated with the liquid outlet. The first branch runner is provided with an inner side liquid inlet section extending along the edge of the middle runner area, and the inner drainage channel communicates with the liquid inlet and the inner side liquid inlet section. The outer drainage channel is communicated with the liquid inlet and the second sub-channel, and the first sub-channel is located between the middle flow channel area and the outer drainage channel in the second direction intersecting with the first direction. According to the technical scheme, the temperature distribution uniformity of the battery module can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a liquid cooling plate and a battery pack. Background Art

[0002] In order to keep the battery pack operating within a suitable temperature range and improve the service life and performance of the battery pack, most of the existing battery packs are equipped with a liquid cooling plate capable of circulating a heat exchange medium to adjust the temperature of the battery module. In high-temperature working conditions, the heat exchange medium is used to cool the battery module, and in low-temperature working conditions, the heat exchange medium is used to heat the battery module. During the heat exchange process between the liquid cooling plate and the battery module, if the heat exchange with each area of the battery module is uneven, the performance of the battery pack will be affected. Summary of the Utility Model

[0003] Based on this, this application provides a liquid cooling plate and a battery pack, which can improve the uniformity of the temperature distribution of the battery modules in the battery pack.

[0004] In a first aspect, this application provides a liquid cooling plate, including:

[0005] A central flow channel area, which is provided with a liquid outlet;

[0006] An outer peripheral flow channel area, and the outer peripheral flow channel areas are arranged on both sides in a first direction of the central flow channel area;

[0007] Each of the outer peripheral flow channel areas includes an inner drainage channel, an outer drainage channel, and a liquid inlet, a first flow dividing channel, and a second flow dividing channel arranged adjacent to each other in the first direction. The first flow dividing channel and the second flow dividing channel independently converge to the central flow channel area and communicate with the liquid outlet;

[0008] The first flow dividing channel has an inner liquid inlet section extending along the edge of the central flow channel area, and the inner drainage channel communicates the liquid inlet and the inner liquid inlet section; the outer drainage channel communicates the liquid inlet and the second flow dividing channel, and the first flow dividing channel is located between the central flow channel area and the outer drainage channel in a second direction intersecting the first direction.

[0009] In some embodiments, the projection length of the inner drainage channel along the first direction is less than the projection length of the outer drainage channel along the first direction.

[0010] In some embodiments, the liquid outlet and the liquid inlet are arranged at the same end of the liquid cooling plate in the second direction.

[0011] In some embodiments, the first flow dividing channel is arranged to extend in a zigzag manner.

[0012] In some embodiments, the first diversion channel further includes a first spiral section spirally extending from the inner liquid inlet section towards the middle of itself, and a second spiral section communicating with the first spiral section and spirally extending towards the middle flow channel area, and the first spiral section and the second spiral section are arranged to surround each other.

[0013] In some embodiments, the second diversion channel includes a plurality of branch channels, and each of the branch channels is independently connected between the outer drainage channel and the middle flow channel area.

[0014] In some embodiments, at least part of the branch channels are arranged to extend in a zigzag manner.

[0015] In some embodiments, the plurality of branch channels include inner branch channels and outer branch channels. The outer branch channels are arranged at the edge of the liquid cooling plate, the inner branch channels are arranged between the first diversion channel and the outer branch channels, and both the outer branch channels and the inner branch channels extend in a zigzag manner and are nested with each other.

[0016] In some embodiments, flow disturbance parts are arranged in the flow channels of the middle flow channel area and / or the peripheral flow channel area.

[0017] In some embodiments, at least part of the flow disturbance parts extend along the drainage direction of the flow channel where they are located.

[0018] In some embodiments, a plurality of the flow disturbance parts are arranged in each flow channel, and the plurality of flow disturbance parts are arranged at intervals in sequence along the drainage direction of the flow channel where they are located, so as to divide the flow channel where they are located into a plurality of parallel flow paths, and the flow paths in the same flow channel communicate with each other.

[0019] In some embodiments, at least part of the flow channels in the peripheral flow channel area and / or at least part of the flow channels in the middle flow channel area have narrowing parts, and the inner diameter of the flow channels of the narrowing parts is reduced.

[0020] In some embodiments, the inner liquid inlet section has the first narrowing part, and the inner diameter of the flow channel of the first narrowing part is reduced in the second direction.

[0021] In some embodiments, the second diversion channel includes an outer branch channel, and a part of the outer branch channel passing through the edge of the liquid cooling plate has a second narrowing part, and the inner diameter of the flow channel of the second narrowing part is reduced in the first direction.

[0022] In some embodiments, the middle flow channel area includes two straight flow channels that are separated from each other and independently connected to the liquid outlet, and the two peripheral flow channel areas are correspondingly connected to the two straight flow channels one by one.

[0023] Second aspect, the present application provides a battery pack, including:

[0024] Box;

[0025] The liquid cooling plate as described in the above embodiment is enclosed with the box body to form a receiving space;

[0026] The battery module is located in the accommodating space and is thermally connected to the liquid cooling plate.

[0027] In some embodiments, an insulating layer is provided on the surface of the liquid cooling plate, and the battery module is thermally connected to the insulating layer.

[0028] In some embodiments, the thickness h1 of the insulating layer is ≥ 0.2 mm.

[0029] In some embodiments, the insulating layer is connected to the battery module via a thermally conductive adhesive layer.

[0030] In some embodiments, the thickness h2 of the thermal conductive adhesive layer is ≥ 0.1 mm.

[0031] In some embodiments, the box body includes a frame, the frame surrounds the battery module, a convex edge is formed on one end edge of the frame, and the liquid cooling plate is supported by the convex edge and fixedly connected to the convex edge.

[0032] The above-mentioned liquid cooling plate and battery pack can exchange heat with different areas of the liquid cooling plate in the first direction respectively through the first branch channel and the second branch channel where the heat exchange medium flows independently, so that the heat exchange between the liquid cooling plate and various parts of the battery module in the first direction can be more uniform.

[0033] Moreover, under high temperature conditions, the temperature of the middle area of ​​the battery module is relatively high. The low-temperature heat exchange medium entering from the liquid inlet enters the inner liquid inlet section through the inner drainage channel. Since the inner liquid inlet section is adjacent to the middle flow channel area, the heat exchange medium can moderately cool down the middle area of ​​the battery module in advance when flowing through the inner liquid inlet section, thereby alleviating the temperature rise in the middle area. Under low temperature conditions, the temperature of the two end areas of the battery module is relatively low. The high-temperature heat exchange medium entering from the liquid inlet flows through the edge of the liquid cooling plate through the outer drainage channel, and can preferentially heat up the two end areas of the battery module. In this way, regardless of high temperature or low temperature conditions, the liquid cooling plate can exchange heat more evenly with various parts of the battery module, which helps to improve the uniformity of the temperature distribution of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] Figure 1Schematic diagram of the external shape of the liquid cooling plate for some embodiments.

[0036] Figure 2 Distribution diagram of the internal flow channels of the liquid cooling plate for some embodiments.

[0037] Figure 3 External shape diagram of the battery pack for some embodiments.

[0038] Figure 4 is Figure 3 exploded view of the battery pack shown.

[0039] Figure 5 Partial schematic diagram of the battery pack for some embodiments.

[0040] Figure 6 Another partial schematic diagram of the battery pack for some embodiments.

[0041] Figure 7 Exploded schematic diagram of the liquid cooling plate, insulation layer, and thermal conductive adhesive layer for some embodiments.

[0042] The reference numerals in the specific embodiments are as follows:

[0043] 100, battery pack;

[0044] 10, liquid cooling plate; X, first direction; Y, second direction;

[0045] 11, middle flow channel area; U, liquid outlet; 11b, straight flow channel;

[0046] 12, peripheral flow channel area; 12c, inner drainage channel; 12d, outer drainage channel; d1, first drainage section; d2, second drainage section; J, liquid inlet; 12f, first shunt channel; f1, inner side liquid inlet section; f2, first spiral section; f3, second spiral section; 12g, second shunt channel; g, branch channel; g1, outer branch channel; g2, inner branch channel;

[0047] 13, turbulence part; S, narrowing part; S1, first narrowing part; S2, second narrowing part;

[0048] 20, box body; 21, frame; 21a, convex edge; 22, bottom protection plate; 23, upper cover; 30, battery module; 40, high-voltage box; 50, battery control system; 60, insulation layer; 70, thermal conductive adhesive layer. Specific embodiments

[0049] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0050] In the description of the present application, it should be understood that if present, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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 thus should not be construed as a limitation of the present application.

[0051] In addition, if present, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0052] In the present application, unless otherwise clearly specified and limited, if present, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0053] In this application, if it appears, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0054] It should be noted that if it appears, when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0055] In order to improve the uniformity of the temperature distribution of the battery modules in the battery pack, an embodiment of this application provides a liquid cooling plate and a battery pack. The liquid cooling plate has a flow channel inside through which a heat exchange medium can flow. When the liquid cooling plate exchanges heat with the battery modules, it can make the temperature distribution of the battery modules more uniform. The liquid cooling plate in the embodiment of this application will be introduced in detail below.

[0056] Figure 1 It is a schematic diagram of the external shape of the liquid cooling plate for some embodiments. Figure 2 It is a distribution diagram of the internal flow channels of the liquid cooling plate for some embodiments.

[0057] Please refer to Figure 1 and Figure 2 In the liquid cooling plate 10 provided by the embodiment of this application, as shown in FIGS. and, it includes a central flow channel area 11 and a peripheral flow channel area 12. The central flow channel area 11 is provided with a liquid outlet U, and the peripheral flow channel areas 12 are arranged on both sides in the first direction X of the central flow channel area 11. Each peripheral flow channel includes an inner diversion channel 12c, an outer diversion channel 12d, and a liquid inlet J, a first diversion channel 12f and a second diversion channel 12g that are arranged adjacent to each other in the first direction X. The first diversion channel 12f and the second diversion channel 12g independently converge to the central flow channel area 11 and communicate with the liquid outlet U. The first diversion channel 12f has an inner liquid inlet section f1 extending along the edge of the central flow channel area 11, and the inner diversion channel 12c communicates the liquid inlet J and the inner liquid inlet section f1. The outer diversion channel 12d communicates the liquid inlet J and the second diversion channel 12g, and the first diversion channel 12f is located between the central flow channel area 11 and the outer diversion channel 12d in the second direction Y intersecting the first direction X.

[0058] The heat exchange medium enters the liquid cooling plate 10 from the liquid inlet J and flows out of the liquid cooling plate 10 from the liquid outlet U. The liquid cooling plate 10 is divided into three flow channel areas along the second direction Y, the flow channel area located in the middle position is the central flow channel area 11, and the flow channel areas located on both sides are the peripheral flow channel areas 12. In actual application, the first direction X is roughly consistent with the arrangement direction of each group of battery modules 30 in the battery pack 100, and the second direction Y is roughly consistent with the side-by-side direction of each battery cell in the battery module 30. The central flow channel area 11 is used for heat exchange in the central area of ​​the battery module 30, and the peripheral flow channel area 12 is used for heat exchange at the two end areas of the battery module 30. It can be that in order to make the two end areas of the battery module 30 evenly exchange heat, the two peripheral flow channel areas 12 can be arranged symmetrically relative to the central flow channel area 11.

[0059] The first branch flow channel 12f and the second branch flow channel 12g are independently connected to the liquid inlet J through the inner drainage channel 12c and the outer drainage channel 12d, respectively, and the two independently converge into the flow channel of the middle flow channel area 11. The first branch flow channel 12f and the second branch flow channel 12g occupy a large heat exchange area on the liquid cooling plate 10, and play a major role in heat exchange for the two end areas of the battery module 30.

[0060] The heat exchange medium enters the first branch channel 12f through the inner liquid inlet section f1, which serves as the liquid inlet section of the first branch channel 12f. Figure 2 As shown, the inner liquid inlet section f1 is located on the inner side of the first branch channel 12f close to the middle channel area 11 and extends substantially along the first direction X. When the inner drainage channel 12c drains the heat exchange medium to the inner liquid inlet section f1, since the inner liquid inlet section f1 is close to the middle channel area 11, it can appropriately exchange heat with the middle area of ​​the battery module 30.

[0061] The first branch flow channel 12f is located between the middle flow channel area 11 and the outer flow channel 12d in the second direction Y. That is, the outer flow channel 12d is at least partially located outside the first branch flow channel 12f away from the middle flow channel area 11. At this time, the outer flow channel 12d is extended along the edge of the liquid cooling plate 10.

[0062] In actual application, the heat exchange medium enters from the liquid inlet J and is divided into two paths, one of which enters the first branch channel 12f through the inner drainage channel 12c and then converges to the flow channel of the middle flow channel area 11, and the other enters the second branch channel 12g through the drainage channel and then converges to the middle flow channel area 11, and finally all the heat exchange medium flows out through the liquid outlet U. The first branch channel 12f and the second branch channel 12g through which the heat exchange medium flows independently exchange heat with different areas of the liquid cooling plate 10 in the first direction X, so that the heat exchange between the liquid cooling plate 10 and various parts of the battery module 30 in the first direction X can be more uniform.

[0063] Moreover, under high-temperature working conditions, the temperature in the middle region of the battery module 30 is relatively high. The low-temperature heat exchange medium entering from the liquid inlet J enters the inner liquid inlet section f1 through the inner diversion channel 12c. Since the inner liquid inlet section f1 is adjacent to the middle flow channel area 11, when the heat exchange medium flows through the inner liquid inlet section f1, it can moderately cool the middle region of the battery module 30 in advance, alleviating the temperature rise in the middle region of the battery module 30. Under low-temperature working conditions, the temperature of the two end edge regions of the battery module 30 is relatively low. The high-temperature heat exchange medium entering from the liquid inlet J flows through the edge of the liquid cooling plate 10 through the outer diversion channel 12d, and can preferentially heat up the two end edge regions of the battery module 30. In this way, whether under high-temperature or low-temperature working conditions, the liquid cooling plate 10 can exchange heat with various parts of the battery module 30 more evenly, which helps to improve the uniformity of the temperature distribution of the battery module 30.

[0064] Specifically, referring to Figure 2 , the middle flow channel area 11 can be divided into two regions, E and F, and each peripheral flow channel area 12 can be divided into two regions, A and B. The liquid inlet J, the inner diversion channel 12c, the outer diversion channel 12d, and the first shunt channel 12f are located in the A region, and the second shunt channel 12g is located in the B region. One peripheral flow channel area 12 is adjacent to the E region, and the other peripheral flow channel area 12 is adjacent to the F region. Through the outer diversion channel 12d, heat can be exchanged with the battery module 30 in contact with the edge of the A region. Through the first shunt channel 12f, heat can be exchanged with the battery module 30 in contact with the middle region of the A region. Through the inner diversion channel 12c and the inner liquid inlet section f1, the battery module 30 in contact with one of the E region and the F region can be moderately heat-exchanged. Through the second shunt channel 12g, heat can be exchanged with the battery module 30 in contact with the B region.

[0065] In some embodiments, referring to Figure 2 , the projected length of the inner diversion channel 12c along the first direction X is less than the projected length of the outer diversion channel 12d along the first direction X.

[0066] Specifically, as Figure 2 shows, the outer diversion channel 12d includes a first diversion section d1 and a second diversion section d2 that are connected. The first diversion section d1 is connected to the liquid inlet J and extends substantially along the second direction Y. The second diversion section d2 is connected to the second shunt channel 12g and extends substantially along the first direction X. The second diversion channel is arranged outside the first shunt channel 12f. The projected length of the outer diversion channel 12d along the first direction X is substantially equal to the extension length of the first diversion section d1. As Figure 2 shows, specifically, the inner diversion channel 12c extends substantially along the second direction Y, and its projected length along the first direction X is equal to its extension length.

[0067] Understandably, the inner drainage channel 12c extends towards the middle flow channel area 11 relative to the liquid inlet J, and the outer drainage channel 12d extends away from the middle flow channel area 11 relative to the liquid inlet J. When the projected length of the inner drainage channel 12c along the first direction X is less than the projected length of the outer drainage channel 12d along the first direction X, it indicates that the liquid inlet J is closer to the middle flow channel area 11 than the edge position of the liquid cooling plate 10 in the second direction Y. Thus, under high-temperature conditions, the heat exchange medium entering from the liquid inlet J can enter the inner liquid inlet section f1 more quickly through the inner drainage channel 12c, and the temperature adjustment of the middle area of the battery module 30 is more rapid.

[0068] In some embodiments, referring to Figure 2 , the liquid outlet U and the liquid inlet J are arranged at the same end of the liquid cooling plate 10 in the second direction Y. At this time, the flow length of the heat exchange medium converging to the middle flow channel area 11 in the middle flow channel area 11 is larger, the heat exchange effect on the middle area of the battery module 30 is better, and the utilization rate of the heat exchange medium is higher.

[0069] In some embodiments, referring to Figure 2 , the first diversion channel 12f is arranged to extend in a zigzag manner. Thus, a longer first diversion channel 12f can be arranged within a limited area, and the heat exchange effect of the first diversion channel 12f is better. There are various zigzag extension methods for the first diversion channel 12f, such as S-shaped extension, N-shaped extension, etc., and those skilled in the art can set them flexibly.

[0070] Specifically in the embodiment, the first diversion channel 12f further includes a first spiral section f2 that spirally extends from the inner liquid inlet section f1 towards the middle of itself, and a second spiral section f3 that is connected to the first spiral section f2 and spirally extends towards the middle flow channel area 11. The first spiral section f2 and the second spiral section f3 are arranged to surround each other.

[0071] It can be understood that the first spiral section f2 spirally extends from the inner side of the first diversion channel 12f towards its middle, and is used to divert the heat exchange medium to the middle of the first diversion channel 12f. The second spiral section f3 is connected to one end of the first spiral section f2 away from the inner liquid inlet section f1, and spirally extends from the middle of the first diversion channel 12f towards the inner side of the first diversion channel 12f and converges to the middle flow channel area 11. The first spiral section f2 and the second spiral section f3 surround each other, so that the flow channel arrangement of the first diversion channel 12f is compact and the flow channel is long.

[0072] Thus, the heat exchange medium entering the inner liquid inlet section f1 can flow towards the middle of the first diversion channel 12f along a spiral path, and then converge to the middle flow channel area 11 along a spiral path from the middle of the first diversion channel 12f. The heat exchange between the first diversion channel 12f and the battery module 30 is relatively uniform, which helps to improve the temperature distribution uniformity of the battery module 30.

[0073] In some embodiments, referring toFigure 2 , the second diversion channel 12g includes a plurality of branch channels g, and each branch channel g is independently connected between the external diversion channel 12d and the middle channel area 11.

[0074] The heat exchange medium diverted to the second diversion channel 12g through the external diversion channel 12d is divided into multiple paths and enters each branch channel g one by one, and finally converges to the middle channel area 11. Since the second diversion channel 12g is far from the liquid inlet J in the first direction X, after the heat exchange medium flows from the liquid inlet J through the external diversion channel 12d to the area where the second diversion channel 12g is located, the heat exchange capacity of the heat exchange medium decreases. At this time, the area where the second diversion channel 12g is located is subjected to parallel heat exchange through a plurality of branch channels g. The flow path of the heat exchange medium in the second diversion channel 12g is short, the residence time of the heat exchange medium is shortened, and thus the flow velocity of the heat exchange medium is increased, so that the second diversion channel 12g can have a good heat exchange effect even if it is far from the liquid inlet J.

[0075] Specifically in the embodiment, referring to Figure 2 , the plurality of branch channels g include inner branch channels g2 and outer branch channels g1. The outer branch channels g1 are arranged at the edge of the liquid cooling plate 10, and the inner branch channels g2 are arranged between the first diversion channel 12f and the outer branch channels g1. Both the outer branch channels g1 and the inner branch channels g2 extend in a zigzag manner and are nested with each other.

[0076] The outer branch channels g1 are arranged at the edge of the liquid cooling plate 10, outside the B area. The heat exchange medium flowing through the outer branch channels g1 can exchange heat with the edge of the battery module 30 in contact with the edge of the liquid cooling plate 10. The inner branch channels g2 are arranged between the first diversion channel 12f and the outer branch channels g1, inside the B area, and can exchange heat with the battery module 30 in contact with the middle of the B area. In this way, the two end edge areas and the two end middle areas of the battery module 30 can be simultaneously heat-exchanged by two parallel heat exchange media, and the heat exchange efficiency is high. Moreover, both the outer branch channels g1 and the inner branch channels g2 extend in a zigzag manner and are nested with each other. Not only does the flow time of each path of heat exchange medium become longer and the heat exchange efficiency become higher, but also the flow channel arrangement area of the second diversion channel 12g in the B area is large, and the heat exchange with the battery module 30 is more uniform, and the temperature distribution of the battery module 30 is more uniform.

[0077] In some embodiments, referring to Figure 2 , a flow disturbing part 13 is arranged in the flow channels of the middle channel area 11 and / or the peripheral channel area 12.

[0078] The spoiler part 13 is used to interfere with the flow of the heat exchange medium in the flow channel where it is located, so that the heat exchange medium cross-mixes in the flow channel, making the temperature of the heat exchange medium more uniform. At the same time, the spoiler part 13 can extend the flow time of the heat exchange medium in the flow channel and improve the heat exchange effect of the heat exchange medium. In addition, the spoiler part 13 divides the flow channel where it is located into multiple flow paths. When one of the flow paths is blocked by an external force impact (ball impact test), the heat exchange medium can flow through other flow paths without causing the entire flow channel to be blocked.

[0079] Specifically, the spoiler part 13 can be a boss, a convex column, etc. formed in the flow channel where it is located. Understandably, the flow channels in the outer flow channel area 12 include the above-mentioned inner diversion channel 12c, outer diversion channel 12d, first diversion channel 12f, and second diversion channel 12g. The flow channels in the middle flow channel area 11 can include the straight flow channel 11b mentioned below.

[0080] Preferably, spoiler parts 13 are provided in each flow channel of the outer flow channel area 12. Spoiler parts 13 are provided in each flow channel of the middle flow channel area 11.

[0081] Specifically in some embodiments, referring to Figure 2 , at least part of the spoiler part 13 extends along the drainage direction of the flow channel where it is located.

[0082] The drainage direction of the flow channel is the direction that guides the flow of the heat exchange medium, which is basically the same as the extension direction of the flow channel. The spoiler part 13 extends in a strip shape along the drainage direction of the flow channel, which can reduce the flow resistance of the flow channel increased by the setting of the spoiler part 13 to a certain extent and accelerate the flow of the heat exchange medium.

[0083] Furthermore, in the embodiments, referring to Figure 2 , a plurality of spoiler parts 13 are provided in each flow channel, and the plurality of spoiler parts 13 are arranged at intervals in sequence along the drainage direction of the flow channel where they are located to divide the flow channel where they are located into multiple parallel flow paths, and the flow paths in the same flow channel communicate with each other.

[0084] In each flow channel, a plurality of spoiler parts 13 can form multiple parallel flow paths in the flow channel along the drainage direction of the flow channel. For example, in the embodiment shown in Figure 2 , two rows of spoiler parts 13 are provided in the flow channel of the middle flow channel area 11, and three flow paths will be formed in the flow channel. One row of spoiler parts 13 is provided in the flow channel of the outer flow channel area 12, and two flow paths are formed in the flow channel.

[0085] The parallel flow paths communicate through the interval spaces between the spoiler parts 13, so that the heat exchange media between the parallel flow paths can cross-mix and flow in parallel along each flow path at the same time. The liquid cooling plate 10 has a high heat exchange efficiency and good heat exchange uniformity.

[0086] In some embodiments, referring to Figure 2, at least part of the flow channels located in the peripheral flow channel area 12 and / or at least part of the flow channels located in the middle flow channel area 11 have a narrowing part S, and the inner diameter of the flow channel of the narrowing part S is set to be reduced.

[0087] When the inner diameter of the flow channel of the flow channel is reduced, the cross-sectional area of the flow channel becomes smaller, which can increase the flow velocity of the heat exchange medium in the flow channel, and thus improve the heat exchange efficiency of the flow channel.

[0088] The reduction of the inner diameter of the flow channel of the narrowing part S means the reduction of the dimension in the plane where the liquid cooling plate 10 is located. If the narrowing part S is located on the flow channel extending along the first direction X, the inner diameter of the flow channel of the narrowing part S is generally reduced in the second direction Y. If the narrowing part S is located on the flow channel extending along the second direction Y, the inner diameter of the flow channel of the narrowing part S is generally reduced in the first direction X.

[0089] Specifically, in the embodiment, as Figure 2 shown, the inner liquid inlet section f1 has a first narrowing part S1, and the inner diameter of the flow channel of the first narrowing part S1 is reduced in the second direction Y. The inner liquid inlet section f1 generally extends along the first direction X, and the inner diameter of the flow channel of its first narrowing part S1 is reduced in the second direction Y. Specifically, the first narrowing part S1, as the liquid inlet end of the inner liquid inlet section f1, is directly communicated with the inner diversion channel 12c.

[0090] Setting the first narrowing part S1 on the inner liquid inlet section f1 can increase the flow velocity of the heat exchange medium, strengthen the heat exchange effect, especially strengthen the heat exchange of the middle area of the battery module 30 under high temperature conditions.

[0091] Specifically, in the embodiment, as Figure 2 shown, the second diversion channel 12g includes an outer branch channel g1, and the part of the outer branch channel g1 passing through the edge of the liquid cooling plate 10 has a second narrowing part S2. The inner diameter of the flow channel of the second narrowing part S2 is reduced in the first direction X. In this way, the flow velocity of the heat exchange medium in the outer branch channel g1 can be increased, the heat exchange effect can be strengthened, especially the heat exchange of the edge area of the battery module 30 under low temperature conditions can be strengthened.

[0092] In some embodiments, the middle flow channel area 11 includes two straight flow channels 11b that are separated from each other and independently communicate with the liquid outlet U, and the two peripheral flow channel areas 12 are in one-to-one correspondence with the two straight flow channels 11b.

[0093] The middle flow channel area 11 is divided into two areas E and F by the two straight flow channels 11b, and the first diversion channels 12f and the second diversion channels 12g of the two peripheral flow channel areas 12 converge to the E area and the F area respectively.

[0094] In this way, the heat exchange between the 11 sub - regions of the middle flow channel area and the battery module 30 can be accelerated, and the temperature distribution of the battery module 30 is more uniform. The straight flow channel 11b is a straight channel extending substantially along the first direction X, which can reduce the flow resistance, further increase the flow velocity of the heat exchange medium, and enhance the heat exchange effect of the middle flow channel area 11 on the battery module 30.

[0095] It should be noted that in the embodiments of the present application, each flow channel on the liquid - cooling plate 10 can be formed by stamping a plate member. For example, the liquid - cooling plate 10 includes a bottom plate and a cover plate. Each flow channel is formed by stamping on the bottom plate, and the cover plate covers and seals each flow channel.

[0096] In addition, the embodiments of the present application also provide a battery pack 100. Figure 3 It is an external view of the battery pack 100 in some embodiments. Figure 4 For Figure 3 the exploded view of the battery pack 100 shown in Figure 3 and Figure 4 Referring to

[0097] The battery pack 100 exchanges heat with the battery module through the liquid - cooling plate 10 in the above - mentioned embodiments, and it has all the beneficial effects in the above - mentioned embodiments, which will not be elaborated here.

[0098] The box body 20 can be made of metal material, plastic material, etc. The liquid - cooling plate 10 can be used as the bottom plate of the box body 20, or the box body 20 can be independently provided with a bottom plate. The battery module 30 usually includes a plurality of battery cells, and the battery cells are connected in parallel, in series, or in a mixed connection. The battery cell is the smallest unit for electrochemical reaction in the battery pack 100, and usually includes a housing, an electrode assembly, an electrolyte, etc. The electrode assembly and the electrolyte are arranged inside the housing. The electrode assembly usually includes a positive electrode plate, a negative electrode plate, and a separator, and the separator is electrically isolated between the positive electrode plate and the negative electrode plate. For the specific structures of the positive electrode plate, the negative electrode plate, and the separator, please refer to the prior art. The electrode assembly can be of a wound type or a stacked type. The battery cell can be in the shape of a cuboid, a cylinder, etc.

[0099] In some embodiments, continue to refer to Figure 4, the battery pack 100 further includes a high-voltage box 40 and a battery control system 50. The high-voltage box 40 is a high-voltage power control and protection unit in the battery pack 100, which electrically connects high-voltage components through busbars and wiring harnesses, and provides functions such as charge and discharge control, power-on control of high-voltage components, circuit overload and short-circuit protection, high-voltage sampling, low-voltage control, and battery temperature regulation for the battery pack 100, protecting and monitoring the operation of the high-voltage system. The battery control system 50 is used to intelligently manage and maintain the battery modules 30, monitor the states of battery cells, and prevent overcharging and over-discharging of battery cells to extend the service life of the battery pack 100.

[0100] Desirably, the liquid cooling plate 10 can be thermally connected to the high-voltage box 40 and / or the battery control system 50 to increase the heat exchange range of the liquid cooling plate 10.

[0101] In a further embodiment, continue to refer to Figure 4 , the box body 20 includes a frame 21, a bottom guard plate 22 and an upper cover 23. The frame 21 surrounds the periphery of the battery modules 30. The bottom guard plate 22 and the upper cover 23 are arranged at two opposite ends of the frame 21. The three together enclose the internal space of the box body 20, and the liquid cooling plate 10 is arranged inside the box body 20. The liquid cooling plate 10 can be directly fixed on the bottom guard plate 22 or fixed on the frame 21.

[0102] Figure 5 It is a partial schematic diagram of the battery pack 100 in some embodiments. Figure 6 It is another partial schematic diagram of the battery pack 100 in some embodiments. Figure 7 It is an exploded schematic diagram of the liquid cooling plate 10, the insulating layer 60 and the thermal conductive adhesive layer 70 in some embodiments.

[0103] In some embodiments, refer to Figure 5 , a convex edge 21a is formed at one end edge of the frame 21. The liquid cooling plate 10 is supported on the convex edge 21a and fixedly connected to the convex edge 21a. Specifically, the edge of the liquid cooling plate 10 overlaps the convex edge 21a and is fixedly connected to the convex edge 21a by means such as welding and bonding.

[0104] In some embodiments, refer to Figure 6 and Figure 7 , an insulating layer 60 is provided on the surface of the liquid cooling plate 10, and the battery module 30 is thermally connected to the insulating layer 60. The liquid cooling plate 10 is usually a metal plate, with fast heat conduction and good heat exchange effect. At this time, insulation isolation is carried out between the liquid cooling plate 10 and the battery module 30 through the insulating layer 60, which can reduce the risk of insulation failure of the battery module 30. Specifically, the insulating layer 60 can be formed by insulating slurry sprayed on the surface of the liquid cooling plate 10 or an insulating film adhered to the surface of the liquid cooling plate 10. Understandably, the insulating layer 60 should have a heat conduction effect, for example, the insulating layer 60 is a ceramic layer, an epoxy resin layer, etc.

[0105] Specifically, with reference to Figure 6 , the layer thickness h1 of the insulating layer 60 ≥ 0.2 mm. At this time, the insulating layer 60 has good insulation and occupies a small space in the battery pack 100, which is beneficial to improving the space utilization rate of the battery pack 100.

[0106] In other embodiments, with reference to Figure 6 and Figure 7 , the insulating layer 60 and the battery module 30 are connected via a thermal conductive adhesive layer 70. The thermal conductive adhesive layer 70 can firmly bond the insulating layer 60 and the battery module 30, making heat transfer more reliable. The thermal conductive adhesive layer 70 can be formed after the thermal conductive glue is cured.

[0107] Specifically, with reference to Figure 6 , the layer thickness h2 of the thermal conductive adhesive layer 70 ≥ 0.1 mm, which not only has reliable bonding but also occupies a small space in the battery pack 100, being beneficial to improving the space utilization rate of the battery pack 100.

[0108] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0109] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A liquid cooling plate (10), characterized in that: include: A middle flow channel region (11) provided with a liquid outlet (U); Peripheral flow channel areas (12), the peripheral flow channel areas (12) being arranged on both sides of the middle flow channel area (11) in the first direction (X); Each of the peripheral flow channel areas (12) comprises an inner drainage channel (12c), an outer drainage channel (12d), and a liquid inlet (J), a first branch flow channel (12f), and a second branch flow channel (12g) arranged adjacent to each other in a first direction (X); the first branch flow channel (12f) and the second branch flow channel (12g) independently converge to the middle flow channel area (11) and are connected to the liquid outlet (U); The first branch flow channel (12f) has an inner liquid inlet section (f1) extending along the edge of the middle flow channel area (11); the inner drainage channel (12c) connects the liquid inlet (J) and the inner liquid inlet section (f1); the outer drainage channel (12d) connects the liquid inlet (J) and the second branch flow channel (12g); the first branch flow channel (12f) is located between the middle flow channel area (11) and the outer drainage channel (12d) in a second direction (Y) intersecting with the first direction (X).

2. The liquid cooling plate (10) according to claim 1, characterized in that: The projected length of the inner drainage channel (12c) along the first direction (X) is smaller than the projected length of the outer drainage channel (12d) along the first direction (X); and / or, The liquid outlet (U) and the liquid inlet (J) are arranged at the same end of the liquid cooling plate (10) in the second direction (Y).

3. The liquid cooling plate (10) according to claim 1, characterized in that: The first branch flow channel (12f) is arranged to extend in a zigzag manner; The first branch flow channel (12f) further comprises a first spiral section (f2) extending spirally from the inner liquid inlet section (f1) toward the middle of the first branch flow channel, and a second spiral section (f3) connected to the first spiral section (f2) and extending spirally toward the middle flow channel area (11), wherein the first spiral section (f2) and the second spiral section (f3) are arranged to surround each other.

4. The liquid cooling plate (10) according to claim 1, characterized in that: The second branch flow channel (12g) includes a plurality of branch flow channels (g), and each of the branch flow channels (g) is independently connected between the outer flow channel (12d) and the middle flow channel area (11); At least part of the branch channel (g) is arranged to extend in a zigzag manner.

5. The liquid cooling plate (10) according to claim 4, characterized in that: The multiple branch channels (g) include an inner branch channel (g2) and an outer branch channel (g1); the outer branch channel (g1) is arranged at the edge of the liquid cooling plate (10); the inner branch channel (g2) is arranged between the first branch channel (12f) and the outer branch channel (g1); the outer branch channel (g1) and the inner branch channel (g2) both extend in a zigzag manner and are nested with each other.

6. The liquid cooling plate (10) according to claim 1, characterized in that: A flow disruptor (13) is provided in the flow channel of the middle flow channel area (11) and / or the peripheral flow channel area (12); At least part of the flow-disturbing portion (13) is extended along the flow-guiding direction of the flow channel; A plurality of the flow spoilers (13) are arranged in each flow channel, and the plurality of the flow spoilers (13) are sequentially spaced apart along the flow diversion direction of the flow channel so as to separate the flow channel into a plurality of parallel flow paths, and the flow paths in the same flow channel are connected to each other.

7. The liquid cooling plate (10) according to claim 1, characterized in that: At least part of the flow channels located in the peripheral flow channel area (12) and / or at least part of the flow channels located in the middle flow channel area (11) have a narrowing portion (S), and the inner diameter of the flow channel of the narrowing portion (S) is reduced; The inner liquid inlet section (f1) has a first narrowing portion (S1), and the inner diameter of the flow channel of the first narrowing portion (S1) is reduced in the second direction (Y); The second branch flow channel (12g) comprises an outer branch flow channel (g1), and a portion of the outer branch flow channel (g1) passing through the edge of the liquid cooling plate (10) has a second narrowing portion (S2), and the inner diameter of the flow channel of the second narrowing portion (S2) is reduced in the first direction (X).

8. The liquid cooling plate (10) according to claim 1, characterized in that: The middle flow channel area (11) comprises two direct flow channels (11b) separated from each other and independently connected to the liquid outlet (U), and the two peripheral flow channel areas (12) are connected to the two direct flow channels (11b) in a one-to-one correspondence.

9. A battery pack (100), characterized in that: include: Box body (20); The liquid cooling plate (10) according to any one of claims 1 to 6, enclosed with the box body (20) to form a receiving space; The battery module (30) is located in the accommodating space and is thermally connected to the liquid cooling plate (10).

10. The battery pack (100) according to claim 9, characterized in that: An insulating layer (60) is provided on the surface of the liquid cooling plate (10), the battery module (30) is thermally connected to the insulating layer (60), and the thickness h1 of the insulating layer (60) is ≥ 0.2 mm; The insulating layer (60) is connected to the battery module (30) via a heat-conducting adhesive layer (70), and the thickness h2 of the heat-conducting adhesive layer (70) is ≥ 0.1 mm; The box body (20) comprises a frame (21), the frame (21) surrounds the outer periphery of the battery module (30), a convex edge (21a) is formed at one end edge of the frame (21), and the liquid cooling plate (10) is supported on the convex edge (21a) and fixedly connected to the convex edge (21a).

Images