Liquid cooling plate and battery pack

Abstract

The application relates to a liquid cooling plate and a battery pack, comprising a flow channel plate, a heat exchange plate and a reinforcing plate. The flow channel plate has a first surface and a second surface arranged oppositely. The flow channel plate comprises a heat exchange flow channel recessed on the first surface and protruding oppositely to the second surface. The heat exchange flow channel comprises an edge flow channel located at the edge of the flow channel plate. The heat exchange plate covers the first surface and seals the heat exchange flow channel. The reinforcing plate is arranged on the second surface. The reinforcing plate is arranged along the length of the edge flow channel and covers the edge flow channel. The peripheral edge of the reinforcing plate is connected to the second surface in a fit manner, and the second surface and the peripheral edge of the reinforcing plate form a closed space. The technical scheme of the application can reduce the risk of cracking of the edge flow channel.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to liquid cooling plates and battery packs. Background Technology

[0002] To improve battery operating temperature and extend battery life, battery boxes often incorporate liquid cooling plates for heat exchange with individual battery cells. During vehicle operation, because the liquid cooling plates are mounted on the battery box frame, their edges are prone to tearing during Z-axis vibration and impact, as these areas are stress concentration zones. Furthermore, if the vehicle is submerged in water, the sealing ring on the battery box's bottom plate is at risk of failure, allowing moisture to enter between the liquid cooling plate and the bottom plate, potentially causing corrosion. Utility Model Content

[0003] Therefore, it is necessary to provide a liquid cooling plate and battery pack to address the problems of easy cracking and corrosion at the edges of the liquid cooling plate.

[0004] In a first aspect, this application proposes a liquid-cooled plate, comprising:

[0005] A flow channel plate has a first surface and a second surface disposed opposite to each other. The flow channel plate includes a heat exchange channel recessed in the first surface and protruding relative to the second surface. The heat exchange channel includes an edge channel located at the edge of the flow channel plate.

[0006] A heat exchange plate is fitted onto the first surface and seals the heat exchange channel;

[0007] A reinforcing plate is disposed on the second surface. The reinforcing plate is arranged along the longitudinal length of the edge flow channel and covers the edge flow channel. The four edges of the reinforcing plate are attached to and connected to the second surface, and together with the second surface, they form a closed space.

[0008] In some embodiments, the second surface includes a non-flow channel surface and a convex surface, wherein the convex surface protrudes relative to the non-flow channel surface, and the outer wall surface of the edge flow channel constitutes the convex surface;

[0009] The reinforcing plate includes an edge segment and a middle segment, and the middle segment is connected to the edge segment at both ends in the longitudinal direction of the reinforcing plate;

[0010] The non-flow channel surface located on at least one side of the edge flow channel is in contact with both the middle section and the edge section. The middle section is in contact with a portion of the outer wall surface and forms a first gap with another portion of the outer wall surface. The edge section is in contact with the outer wall surface and closes the first gap to form the enclosed space.

[0011] In some embodiments, the reinforcing plate further includes a transition section connecting the middle section and the edge section;

[0012] The transition section is partially fitted and connected to the outer wall surface, and is spaced apart from another part of the outer wall surface to form a second gap. The second gap is connected to the first gap and together constitute the enclosed space.

[0013] The width of the second gap increases from one end near the edge segment to the other end, while the width of the first gap is the same everywhere.

[0014] In some embodiments, the outer wall surface includes an outer bottom wall and an outer side wall, the outer side wall being intersected and connected between the outer bottom wall and the non-flow channel surface;

[0015] The middle section and the transition section are both fitted and connected to the outer bottom wall, and are respectively spaced apart from the outer side wall to form the first gap and the second gap. The edge section is fitted and connected to both the outer side wall and the outer bottom wall to close the enclosed space formed by the first gap and the second gap.

[0016] In some embodiments, the edge segment, the transition segment, and the middle segment are all fitted and connected to the non-channel surfaces on both sides of the edge channel, and the middle segment and the transition segment are respectively spaced apart from the outer wall on both sides of the edge channel by the first gap and the second gap.

[0017] In some embodiments, along the longitudinal direction of the reinforcing plate, the length of the middle section, the length of the transition section, and the length of the edge section decrease sequentially.

[0018] In some embodiments, a first vent is provided on the middle section, the first vent being located in the area of ​​the middle section that is in contact with the outer wall surface.

[0019] In some embodiments, the liquid cooling plate includes a first anti-corrosion layer, an insulating anti-corrosion layer, and / or a second anti-corrosion layer, an insulating anti-corrosion layer;

[0020] The heat exchange plate includes a heat exchange surface, which is disposed opposite to the first surface. The first anti-corrosion layer and the insulating anti-corrosion layer are disposed on the heat exchange surface, and the second anti-corrosion layer and the insulating anti-corrosion layer are disposed on the second surface and cover the reinforcing plate.

[0021] In some embodiments, the liquid cooling plate includes a first anti-corrosion layer, an insulating anti-corrosion layer, and a second anti-corrosion layer, wherein the thickness of the first anti-corrosion layer is greater than the thickness of the second anti-corrosion layer.

[0022] In some embodiments, the thickness of the first anti-corrosion layer and the insulating anti-corrosion layer is 150-300 μm, and the thickness of the second anti-corrosion layer and the insulating anti-corrosion layer is 50-150 μm.

[0023] In some embodiments, the flow channel plate and the heat exchange plate together form an installation area and a heat exchange area on the liquid cooling plate. The installation area is located around the heat exchange area, the heat exchange flow channel is located in the heat exchange area, and the first anti-corrosion layer and the insulating anti-corrosion layer avoid the installation area.

[0024] In some embodiments, the flow channel plate and the heat exchange plate together form a fixed area on the liquid cooling plate, the heat exchange area surrounds the fixed area, the fixed area is provided with a fixed hole penetrating the heat exchange plate and the flow channel plate, and the first anti-corrosion layer and the second anti-corrosion layer are insulating and anti-corrosion and avoid the fixed area.

[0025] In some embodiments, the flow channel plate further includes a concave-convex portion recessed in the first surface and protruding out of the second surface, the heat exchange plate enclosing the concave-convex portion, the concave-convex portion being independent of the heat exchange flow channel; a plurality of the concave-convex portions are arranged longitudinally side by side, and a second exhaust hole is provided between adjacent concave-convex portions, the second exhaust hole being disposed through the flow channel plate, and the second exhaust hole avoiding the heat exchange flow channel.

[0026] In some embodiments, the flow channel plate is provided with reinforcing protrusions that protrude from the second surface and are located on different sides of the flow channel plate from the edge flow channel.

[0027] In some embodiments, the reinforcing plate includes a first layer and a second layer stacked together, the thickness of the first layer is less than the thickness of the second layer, the first layer is made of aluminum, the second layer is made of aluminum, and the second layer is bonded to the second surface.

[0028] Secondly, this application proposes a battery pack, characterized in that it comprises:

[0029] Battery box;

[0030] The liquid cooling plate as described in the first aspect is fixedly connected to the battery box;

[0031] The battery cell is disposed inside the battery box and is thermally connected to the heat exchange plate.

[0032] Compared with the prior art, this application has the following beneficial effects:

[0033] The aforementioned liquid cooling plate and battery pack, with the reinforcing plate directly strengthening the edge flow channels' strength and rigidity, also disperse stress, reducing the stress on the edge flow channels and lowering the risk of edge flow channel fracture. On the other hand, the formation of the enclosed space hinders water vapor corrosion in the edge flow channels subjected to higher stress, preventing structural strength reduction due to chemical corrosion and thus avoiding the risk of fracture in this part of the edge flow channels. Furthermore, the enclosed space also prevents water vapor from eroding the interface between the reinforcing plate and the second surface, preventing water vapor erosion from weakening the reinforcing effect of the reinforcing plate and ensuring the continuity of the reinforcing effect. This results in a technical effect where the reinforcing plate and the enclosed space have a 1+1>2 technical benefit. Moreover, since the outer wall of the edge flow channels is curved, the enclosed space reduces the contact area between the reinforcing plate and the edge flow channels, lowering the processing difficulty of the reinforcing plate, ensuring good adhesion between the reinforcing plate and the second surface, ensuring the sealing of the enclosed space, and improving corrosion resistance reliability. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 This is an exploded view of a battery pack according to some embodiments;

[0036] Figure 2 This is a schematic diagram of the external shape of a battery cell in some embodiments;

[0037] Figure 3 This is an exploded view of a battery cell in some embodiments;

[0038] Figure 4 This is an exploded view of the top cover assembly in some embodiments;

[0039] Figure 5 This is an exploded view of the liquid cooling plate in some embodiments;

[0040] Figure 6 This is a first-angle view of a liquid cooling plate according to some embodiments;

[0041] Figure 7 This is a bottom schematic diagram of the flow channel plate in some embodiments;

[0042] Figure 8 for Figure 7 A partial sectional view at point AA in the middle;

[0043] Figure 9 for Figure 7 A partial sectional view at point BB;

[0044] Figure 10 for Figure 7 A partial sectional view at point CC;

[0045] Figure 11 for Figure 10 Enlarged view at point D;

[0046] Figure 12 for Figure 10 Enlarged view at point E in the middle;

[0047] Figure 13 These are schematic diagrams of the reinforcing plates in some embodiments;

[0048] Figure 14 This is a schematic diagram of the heat exchange plate in some embodiments.

[0049] The reference numerals in the detailed embodiments are as follows:

[0050] 1000, Battery pack; 100, Liquid cooling plate; Q1, Mounting area; Q2, Heat exchange area; 110, Flow channel plate; M, First surface; N, Second surface; N1, Non-flow channel surface; N2, Convex surface; 111, Heat exchange flow channel; 111a, Edge flow channel; a1, Outer wall surface; a11, Outer bottom wall; a12, Outer side wall; 112, Concave-convex portion; W, Width direction of edge flow channel; 113, Second vent hole; 114, Reinforcing protrusion; 120, Heat exchange plate; 121, Heat exchange surface; Q3, Fixing area; 122, Fixing hole; 130, Reinforcing plate; 131, Edge section; 132, Middle section; j1, First gap; 133, Transition section; j2, Second gap; J, Sealing plate Closed space; 130a, first layer plate; 130b, second layer plate; 134, first vent; 140, first insulating and anti-corrosion layer; 150, second insulating and anti-corrosion layer; 200, battery box; 210, box body; 220, box cover; 300, battery cell; 310, electrode assembly; 320, top cover assembly; 321, cover plate; 321a, liquid injection hole; 322, terminal post; 323, upper plastic; 324, lower plastic; 325, sealing element; 326a, end cap patch; 326b, protective patch; 327, explosion-proof valve; 328, electrode lead-out element; 329, riveting element; 350, shell; 360, bottom support plate; 370, insulating film; 380, protective film. Detailed Implementation

[0051] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0052] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0053] Furthermore, where applicable, 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] 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.

[0056] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0057] To reduce the risk of tearing of the flow channels at the edge of the liquid cooling plate and to reduce the risk of corrosion of the liquid cooling plate, this application proposes a liquid cooling plate and a battery pack.

[0058] The battery pack 1000 in this embodiment of the application refers to... Figure 1 The battery pack 1000 includes a battery box 200 and battery cells 300, with several battery cells 300 housed within the battery box 200. Multiple battery cells 300 can be electrically connected in series, parallel, or a combination of both. The battery cell 300 is the smallest unit in the battery pack 1000 where electrochemical reactions occur, and can be a secondary or primary battery. The battery cell 300 can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 300 can be cylindrical, flat, cuboid, or other shapes.

[0059] In one embodiment, reference continues... Figure 1 The battery box 200 includes a box body 210 and a box cover 220, which together form the internal space of the battery box 200. Optionally, the box body 210 forms the internal space of the battery box 200, and one end of the space is open, while the box cover 220 closes the box body 210 to seal the space.

[0060] In some embodiments, combined with Figure 2 and Figure 3The battery cell 300 includes a housing 350, a top cover assembly 320, and an electrode assembly 310. The housing 350 and the top cover assembly 320 together form an internal space for accommodating the electrode assembly 310. Specifically, the housing 350 may have a receiving cavity formed therein, with at least one end open. The top cover assembly 320 closes onto the open end of the housing 350 to seal the receiving cavity, and the electrode assembly 310 is mounted within the receiving cavity. The housing 350 may be, but is not limited to, a metal housing 350, such as an aluminum housing or a steel housing.

[0061] Further in the embodiments, refer to Figure 3 The battery cell 300 also includes a protective film 380, which wraps around the outside of the casing 350 and serves to insulate and prevent impacts and scratches to the casing 350. In a further example, refer to... Figure 3 A base plate 360 ​​is provided at the bottom of the housing 350. The base plate 360 ​​supports the electrode assembly 310 and is positioned between the housing 350 and the electrode assembly 310. This is to prevent interference between the bottom corners of the electrode assembly 310 and the housing 350, and to enhance the strength of the bottom of the housing 350, preventing damage to the electrode assembly 310 when the bottom of the housing 350 is impacted. (Refer to...) Figure 2 Optionally, an insulating film 370 is wrapped around the electrode assembly 310 to insulate the electrode assembly 310 from the housing 350. Further optionally, an insulating film 370 is also provided between the electrode assembly 310 and the top cover assembly 320 to reduce the risk of leakage of the battery cell 300.

[0062] In some embodiments, please refer to Figure 4The top cover assembly 320 includes a cover plate 321, an electrode post 322, and a sealing element 325. The electrode post 322 is sealed and mounted on the cover plate 321 by the sealing element 325. In a further embodiment, the top cover assembly 320 also includes an upper plastic 323 and a lower plastic 324. The upper plastic 323 is located inside the cover plate 321 and is disposed opposite to the electrode assembly 310. The lower plastic 324 is located outside the cover plate 321 and is insulated between the electrode post 322 and the cover plate 321. The cover plate 321 is used to cover the open end of the housing 350. In a further embodiment, the top cover assembly 320 also includes a riveting member 329. The riveting member 329 is disposed outside the cover plate 321 and welded to the electrode post 322. The lower plastic 324 is insulated between the riveting member 329 and the cover plate 321. Optionally, a groove is provided on the lower plastic 324, and the riveting part 329 is installed in the groove, which can both position the riveting part 329 and better insulate the riveting part 329 and the cover plate 321. In a further embodiment, an explosion-proof valve 327 is installed on the cover plate 321. Optionally, a protective patch 326b is provided on the cover plate 321 corresponding to the explosion-proof valve 327. Further optionally, an end cap patch 326a is provided on the outer end face of the cover plate 321. In a further embodiment, the top cover assembly 320 includes an adapter piece 328, which is located on the inner side of the cover plate 321 and electrically connected to the pole post 322 for electrical connection with the electrode tab, thereby realizing the electrical connection between the pole post 322 and the electrode tab.

[0063] The battery cell 300 can be a liquid battery or a solid battery. If the battery cell 300 is a liquid battery, in some embodiments, the electrode assembly 310 includes a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. A liquid electrolyte (i.e., electrolyte solution) can be injected into the battery cell 300. The electrolyte solution wets the interior of the electrode assembly 310, providing an ion migration pathway for the electrochemical reaction of the electrode assembly 310 and serving a conductive function. Both the positive and negative electrodes include tabs and are electrically connected to the terminal post 322 through the tabs. The electrode assembly 310 can be in the form of a wound type, a stacked type, etc. One or more electrode assemblies 310 can be installed in the battery cell 300. In one embodiment, an explosion-proof valve 327 is provided on the top cover assembly 320. The explosion-proof valve 327 can release pressure when the internal pressure of the battery cell 300 reaches a threshold, preventing the battery cell 300 from exploding. In a further example, the top cover assembly 320 is provided with an injection hole 321a for filling the battery cell 300 with electrolyte. If the battery cell 300 is a solid-state battery, its electrolyte is solid-state and disposed between the positive and negative electrode plates, compared with a liquid battery. In this case, the design of the injection hole 321a on the top cover assembly 320 is usually omitted.

[0064] Furthermore, the battery pack 1000 in this embodiment also includes a liquid cooling plate 100, which is mounted on the battery box 200 for heat exchange with the individual battery cells 300 inside the battery box 200. The liquid cooling plate 100 proposed in this embodiment is described in detail below.

[0065] Please refer to Figure 5 , Figure 6 and Figure 7 The liquid cooling plate 100 proposed in this embodiment includes a flow channel plate 110, a heat exchange plate 120, and a reinforcing plate 130. The flow channel plate 110 has a first surface M and a second surface N disposed opposite to each other. The flow channel plate 110 includes a heat exchange channel 111 recessed in the first surface M and protruding relative to the second surface N. The heat exchange channel 111 includes an edge channel 111a located at the edge of the flow channel plate 110. The heat exchange plate 120 covers the first surface M and closes the heat exchange channel 111. The reinforcing plate 130 is disposed on the second surface N. The reinforcing plate 130 is disposed longitudinally along the edge channel 111a and covers the edge channel 111a. The four edges of the reinforcing plate 130 are attached to and connected to the second surface N, and together with the second surface N, they form a closed space J.

[0066] Specifically, the liquid cooling plate 100 exchanges heat with the battery cell 300 through its heat exchange plate 120. The surface of the heat exchange plate 120 facing away from the flow channel surface is typically flat. The heat exchange plate 120 is generally flat. A heat exchange flow channel 111 is typically formed by stamping the first surface M of the flow channel plate 110 towards the second surface N, resulting in a heat exchange flow channel 111 that is recessed relative to the first surface M and convex relative to the second surface N. The heat exchange plate 120 covers the first surface M, thus sealing the heat exchange flow channel 111 and preventing leakage. A water inlet is typically provided on the heat exchange plate 120 or the flow channel plate 110, communicating with the heat exchange flow channel 111 for the entry and exit of the heat exchange medium.

[0067] The heat exchange channels 111 have a large area on the flow channel plate 110, so that the liquid cooling plate 100 can uniformly exchange heat with the battery cells 300 at different positions. The edge flow channels 111a are heat exchange channels 111 located at the edge of the flow channel plate 110. In one embodiment, the flow channel plate 110 is square plate shaped, and the edge flow channels 111a are arranged at both ends in the width direction of the flow channel plate 110 and extend along the length direction of the flow channel plate 110.

[0068] The reinforcing plate 130 is used to strengthen the edge flow channel 111a. Specifically, the reinforcing plate 130 can be disposed locally in the edge flow channel 111a or along the entire edge flow channel 111a. The four edges of the reinforcing plate 130 refer to the end face of the reinforcing plate 130 facing the second surface N, which is in close contact with the second surface N to form a closed space J. At least a portion of the edge flow channel 111a is located in the closed space J and is covered by the reinforcing plate 130.

[0069] The second surface N portion, which is in close contact with the reinforcing plate 130, is usually welded to the reinforcing plate 130. This ensures the connection strength between the reinforcing plate 130 and the flow channel plate 110, and also helps to ensure the airtightness of the enclosed space J.

[0070] In the aforementioned liquid cooling plate 100, since the edge flow channel 111a is located in the edge region of the flow channel plate 110, the edge region is prone to stress concentration due to Z-axis vibration. In practical applications, a reinforcing plate 130 is provided on the edge flow channel 111a located in the stress concentration region, and the reinforcing plate 130 forms a closed space J with the second surface N. This arrangement serves two purposes: firstly, the reinforcing plate 130 directly strengthens the strength and rigidity of the edge flow channel 111a and disperses stress, reducing the magnitude of stress borne by the edge flow channel 111a and lowering the risk of fracture. Secondly, the formation of the closed space J prevents water vapor corrosion and reduces the stress on this part of the edge flow channel 111a, thus preventing the structural strength of this part of the edge flow channel 111a from decreasing due to chemical corrosion and further reducing the risk of fracture. Furthermore, the enclosed space J prevents moisture from eroding the interface between the reinforcing plate 130 and the second surface N, thus avoiding weakening the reinforcing effect of the reinforcing plate 130 and ensuring the continuity of its reinforcing effect. This results in a synergistic effect where the reinforcing plate 130 and the enclosed space J achieve a 1+1>2 technical effect. Moreover, since the outer wall a1 of the edge flow channel 111a is curved, the enclosed space reduces the contact area between the reinforcing plate 130 and the edge flow channel 111a, lowering the processing difficulty of the reinforcing plate 130, ensuring a good fit between the reinforcing plate 130 and the second surface N, ensuring the sealing of the enclosed space J, and improving corrosion resistance reliability.

[0071] Understandably, refer to Figures 8 to 10 The second surface N includes a non-flow channel surface N1 and a convex surface N2. The convex surface N2 protrudes relative to the non-flow channel surface N1, and the outer wall surface a1 of the edge flow channel 111a constitutes the convex surface N2. Specifically, the convex surface N2 protrudes away from the heat exchange plate 120 and is formed by the outer wall surface a1 of the edge flow channel 111a. The non-flow channel surface N1 is generally planar.

[0072] In some embodiments, combined with Figure 8 , Figure 9 and Figure 10 It is understood that the reinforcing plate 130 includes an edge segment 131 and a middle segment 132. The middle segment 132 is connected to the edge segment 131 at both ends in the longitudinal direction of the reinforcing plate 130. The non-flow channel surface N1 located on at least one side of the edge flow channel 111a is in close contact with both the middle segment 132 and the edge segment 131. The middle segment 132 is partially in close contact with the outer wall surface a1 and forms a first gap j1 with the other part of the outer wall surface a1. The edge segment 131 is in close contact with the outer wall surface a1 and closes the first gap j1 to form a closed space J.

[0073] Understandably, the outer wall surface a1 is a convex surface N2. The non-flow channel surface N1 is located in the width direction W of the edge flow channel. The middle section 132 and the edge section 131 are directly or indirectly connected along the longitudinal direction of the reinforcing plate 130.

[0074] It can also be understood that the non-flow channel surface N1, which is attached to the reinforcing plate 130, extends along the longitudinal length of the reinforcing plate 130 and is continuously attached to the reinforcing plate 130, and is attached to both the middle section 132 and the edge section 131, so as to form a barrier in the width direction of the reinforcing plate 130 that prevents water vapor from entering the enclosed space J.

[0075] In one embodiment, the reinforcing plate 130 is bonded to both non-flow channel surfaces N1 on both sides of the edge flow channel 111a, that is, both sides of the middle section 132 and the edge section 131 are bonded to the non-flow channel surfaces N1 on both sides of the edge flow channel 111a in a one-to-one correspondence. In another embodiment, the reinforcing plate 130 is bonded to only one side of the non-flow channel surface N1 of the edge flow channel 111a, that is, the same side of the middle section 132 and the edge section 131 is bonded to the non-flow channel surface N1 on the same side of the edge flow channel 111a.

[0076] The middle section 132 is partially bonded to the outer wall surface a1, and a first gap j1 is formed between it and another part of the outer wall surface a1. The connection interface formed by the bonding of the outer wall surface a1 and the middle section 132 is called the middle bonding interface. The length of the middle bonding interface is the same as the length of the middle section 132, that is, the middle section 132 and the outer wall surface a1 are continuously bonded along the longitudinal direction of the reinforcing plate 130. It is worth noting that although the middle section 132 and the outer wall surface a1 are continuously bonded at the middle bonding interface, whether the middle section 132 and the outer wall surface a1 are fixed is not limited. That is, the middle section 132 and the outer wall surface a1 can be fixed or not fixed. When the middle section 132 and the outer wall surface a1 are fixed, the fixing position (such as brazing weld marks) can be continuously set along the middle bonding interface or intermittently set along the middle bonding interface.

[0077] If both sides of the middle section 132 are in contact with the non-flow channel surfaces N1 on both sides of the edge flow channel 111a (e.g.) Figure 9 As shown), the outer wall surface a1 on both sides of the middle bonding interface forms a first gap j1 with the middle section 132, that is, a first gap j1 is formed on both sides of the middle bonding interface, and the first gap j1 constitutes a closed space J.

[0078] If one end of the middle section 132 in the width direction of the reinforcing plate 130 is attached to the non-flow channel surface N1 on one side of the edge flow channel 111a (not shown), then the other end of the middle section 132 is attached to the outer wall surface a1 to form the aforementioned middle attachment interface, and the middle attachment interface has a first gap j1 formed only on one side. Further, the non-flow channel surface N1 attached to the middle section 132 is located on the outer side of the edge flow channel 111a (i.e., the side near the edge of the flow channel plate 110). Since the stress mainly originates from the edge of the flow channel plate 110, attaching the middle section 132 to the outer non-flow channel surface N1 has a better stress dispersion effect and a better reinforcement effect. Of course, in other embodiments, the non-flow channel surface N1 attached to the middle section 132 is located on the inner side of the edge flow channel 111a (i.e., the side near the center of the flow channel plate 110).

[0079] Edge segment 131 is located at the end of the reinforcing plate 130 in the longitudinal direction. The portion of edge segment 131 that is opposite to the outer wall surface a1 of edge flow channel 111a is in contact with the outer wall surface a1 to close the end of the reinforcing plate 130, thereby closing the first gap j1 to form a closed space J.

[0080] At this time, since the middle section 132 of the reinforcing plate 130 is in close contact with the outer wall surface a1 of the edge flow channel 111a, the reinforcing plate 130 is in contact with the edge flow channel 111a, which improves the reinforcing effect of the reinforcing plate 130 on the edge flow channel 111a. Moreover, the stress on the edge flow channel 111a can also be dispersed towards the outer non-flow channel surface N1 through the middle section 132 of the reinforcing plate 130, further reducing its fracture risk.

[0081] Since the reinforcing plate 130 is arranged in a strip shape along the edge flow channel 111a, and the edge segment 131 is fitted and connected to the outer wall surface a1 of the edge flow channel 111a, it means that the shape of the edge segment 131 matches the shape of the outer wall surface a1 of the edge flow channel 111a to which it is fitted. In one embodiment, the length of the edge segment 131 is less than the length of the middle segment 132, so as to shorten the conformal length of the reinforcing plate 130 and the edge flow channel 111a and reduce the processing difficulty of the reinforcing plate 130.

[0082] In a further embodiment, combined with Figures 7 to 11 The reinforcing plate 130 also includes a transition section 133, which connects the middle section 132 and the edge section 131. The transition section 133 is partially fitted to the outer wall surface a1 and forms a second gap j2 with another portion of the outer wall surface a1. The second gap j2 connects to the first gap j1 and together constitutes a closed space J. The width of the second gap j2 increases progressively from one end near the edge section 131 to the other end, while the width of the first gap j1 is constant throughout.

[0083] Both ends of the middle section 132 are connected to an edge section 131 via a transition section 133. The middle section 132, the transition section 133, and the edge section 131 are integrally formed. The transition section 133 is bonded to the outer wall surface a1 to form a transition bonding interface, and the length of the transition bonding interface is the same as the length of the transition section 133, that is, the transition section 133 and the outer wall surface a1 are continuously bonded along the longitudinal direction of the reinforcing plate 130. Understandably, the edge section 131 is bonded to the outer wall surface a1 to form an edge bonding interface, and the middle bonding interface, the transition bonding interface, and the edge bonding interface are continuous along the longitudinal direction of the reinforcing plate 130, that is, the three are continuously arranged.

[0084] Understandably, if the two sides of the middle section 132 are bonded to non-flow channel surfaces N1, the two sides of the transition section 133 are also bonded to non-flow channel surfaces N1. If one side of the middle section 132 is bonded to a non-flow channel surface N1, then the same side of the transition section 133 is also bonded to a non-flow channel surface N1. If both sides of the transition section 133 are bonded to non-flow channel surfaces N1, then the outer wall surfaces a1 on both sides of the transition bonding interface form a second gap j2 with the transition section 133 (e.g., Figure 10 (As shown). If one side of the transition section 133 is attached to the non-flow channel surface N1, then the outer wall surface a1 on the side of the transition interface and the gap between the transition section 133 form a second gap j2. The second gap j2 is connected to the first gap j1 and together they form a closed space J.

[0085] The width w1 of the first gap j1 is the largest of the shortest distances from any point on the outer wall surface a1 of the edge flow channel 111a to the inner wall surface of the middle section 132 on a cross section perpendicular to the extension direction of the edge flow channel 111a. The width w2 of the second gap j2 is the largest of the shortest distances from any point on the outer wall surface a1 of the edge flow channel 111a to the inner wall surface of the middle section 132 on a cross section perpendicular to the extension direction of the edge flow channel 111a.

[0086] Along the extension direction of the edge flow channel 111a, the width w1 of the first gap j1 is equal everywhere, and the width w2 of the second gap j2 increases from one end near the edge segment 131 to one end near the middle segment 132, making the transition segment 133 roughly trumpet-shaped and flared towards the middle segment 132, thus providing a gradual transition and reducing the processing difficulty of the reinforcing plate 130. The equal width w1 of the first gap j1 along the extension direction of the edge flow channel 111a, and the essentially consistent shape of any cross-section of the middle segment 132, further reduce the processing difficulty of the reinforcing plate 130. In some embodiments, the outer wall surface a1 includes an outer bottom wall a11 and an outer side wall a12, with the outer side wall a12 intersecting and connecting between the outer bottom wall a11 and the non-flow channel surface N1. The middle section 132 and the transition section 133 are both attached to the outer bottom wall a11 and form a first gap j1 and a second gap j2 with the outer side wall a12 respectively. The edge section 131 is attached to both the outer side wall a12 and the outer bottom wall a11 to close the closed space J formed by the first gap j1 and the second gap j2.

[0087] The outer bottom wall a11 is roughly planar, while the outer outer wall a12 is generally curved. A transitional connection is formed between the outer bottom wall a11 and the non-flow channel surface N1, reducing stress concentration during the stamping process and lowering the stamping difficulty. The middle section 132 fits against the outer bottom wall a11 to form a middle fitting interface, and the transition section 133 fits against the outer bottom wall a11 to form a transition fitting interface. The first gap j1 is located between the middle section 132 and the outer outer wall a12, and the second gap j2 is located between the transition section 133 and the outer outer wall a12.

[0088] At this point, the outer bottom wall a11, which is approximately planar, is planarly fitted with the middle section 132 and the transition section 133, resulting in a higher degree of fit, better sealing, and easier implementation of the conformal design of the reinforcing plate 130 and the outer bottom wall a11, reducing the processing difficulty of the reinforcing plate 130. In some embodiments, the edge section 131, the transition section 133, and the middle section 132 are all fitted and connected to the non-flow channel surfaces N1 on both sides of the edge flow channel 111a, and the middle section 132 and the transition section 133 each form a first gap j1 and a second gap j2 at intervals between the middle section 132 and the outer side wall a12 on both sides of the edge flow channel 111a. At this point, the reinforcing plate 130 covers all parts of the edge flow channel 111a in the width direction W of the edge flow channel, providing better reinforcement and corrosion isolation effects for the edge flow channel 111a, and significantly reducing the risk of breakage of the edge flow channel 111a.

[0089] In some embodiments, refer to Figure 13 Along the longitudinal direction of the reinforcing plate 130, the length of the middle section 132, the length of the transition section 133, and the length of the edge section 131 decrease sequentially.

[0090] The entire edge segment 131 is flush with the edge flow channel 111a, requiring it to conform completely to the edge flow channel 111a, which is quite difficult to manufacture. Therefore, the length of the edge segment 131 (Figure L3) is set to the shortest possible value. The transition segment 133 serves as a transition. If the length of the transition segment 133 (Figure L2) is too long, it will increase the manufacturing difficulty of the reinforcing plate 130. If the length of the transition segment 133 is too short, the connection angles between the two ends of the transition segment 133 and the middle segment 132 and the edge segment 131 will be large, making it difficult to manufacture. The length of the middle segment 132 (Figure L1) is set to the maximum value, mainly because the conformal area between the middle segment 132 and the edge flow channel 111a is small, which can reduce the manufacturing difficulty of the reinforcing plate 130.

[0091] In some embodiments, refer to Figure 13 A first exhaust port 134 is provided on the middle section 132, and the first exhaust port 134 is located in the area of ​​the middle section 132 that is in contact with the outer wall surface a1.

[0092] If the middle section 132 is attached to the outer bottom wall a11, the first vent 134 is located in the part where the middle section 132 is attached to the outer bottom wall a11. In practical applications, after the middle section 132 is attached to the outer wall surface a1, they are brazed together. During the brazing process, the air trapped between them is discharged through the first vent 134. By placing the first vent 134 in the attachment area, the attachment area can prevent external moisture from entering the enclosed space J through the first vent 134, while maintaining the integrity and continuity of the edge areas on both sides of the reinforcing plate 130.

[0093] Specifically, along the extension direction of the reinforcing plate 130, multiple first vent holes 134 are sequentially arranged in the middle section 132, so that the gas is discharged from the middle section 132 in a concentrated and controllable manner, avoiding the formation of pores or blockage of brazing filler metal due to the inability to completely discharge the gas.

[0094] In order to form a closed space J covering the edge flow channel 111a between the reinforcing plate 130 and the second surface N, in other embodiments, the reinforcing plate 130 is bonded to the non-flow channel surfaces N1 on both sides of the edge flow channel 111a, and the edge segment 131 of the reinforcing plate 130 is bonded to the outer wall surface a1, while the middle segment 132 of the reinforcing plate 130 is not bonded to the outer wall surface a1 of the edge flow channel 111a. In this case, the stress transmitted to the edge flow channel 111a by the reinforcing plate 130 through the non-flow channel surfaces N1 on both sides can reduce the risk of cracking of the edge flow channel 111a, and the formed closed flow channel can prevent water vapor from entering the closed space J and corroding the edge flow channel 111a.

[0095] In some embodiments, the liquid cooling plate 100 includes a first insulating and anti-corrosion layer 140 and / or a second insulating and anti-corrosion layer 150. The heat exchange plate 120 includes a heat exchange surface 121, which is disposed opposite to the first surface M. The first insulating and anti-corrosion layer 140 is disposed on the heat exchange surface 121, and the second insulating and anti-corrosion layer 150 is disposed on the second surface N and covers the reinforcing plate 130.

[0096] In practical applications, the first insulating and anti-corrosion layer 140 and the second insulating and anti-corrosion layer 150 can be obtained by spraying insulating and anti-corrosion coatings on the heat exchange surface 121 and the second surface N, respectively.

[0097] The first insulating and anti-corrosion layer 140 and the second insulating and anti-corrosion layer 150 serve two purposes. First, they enhance the liquid cooling plate 100's resistance to moisture erosion, protecting its internal flow channels and preventing perforation, leakage, and performance degradation due to corrosion. The second insulating and anti-corrosion layer 150 covers the reinforcing plate 130, preventing corrosion and material deterioration, thus improving its reliability and ensuring safety even in harsh environments such as humid or polluted conditions. Second, the first insulating and anti-corrosion layer 140 and the second insulating and anti-corrosion layer 150 typically possess a certain degree of hardness and toughness, providing a protective layer for the relatively soft aluminum liquid cooling plate 100 surface, preventing damage from scratches and collisions during assembly, transportation, or use. Furthermore, they insulate the liquid cooling plate 100 from the electrical components within the battery box 200, preventing short circuits and enhancing electrical safety.

[0098] Regarding the specific materials of the first insulating and anti-corrosion layer 140 and the second insulating and anti-corrosion layer 150, conventional choices can be made, such as epoxy resin coating, silicone rubber coating, and other materials that can both insulate and prevent corrosion.

[0099] In some embodiments, the liquid cooling plate 100 includes a first insulating and anti-corrosion layer 140 and a second insulating and anti-corrosion layer 150, and the thickness of the first insulating and anti-corrosion layer 140 is greater than the thickness of the second insulating and anti-corrosion layer 150.

[0100] In practical applications, the first insulating and anti-corrosion layer 140 faces the battery cell 300 and needs to meet the safety requirements of insulation and voltage resistance. Its thickness can be designed to be 150-300μm, which can ensure electrical safety and prevent water vapor and other chemical corrosion of the liquid cooling plate 100.

[0101] The second insulating and anti-corrosion layer 150 faces away from the battery cell 300 and has no voltage resistance requirement; its main purpose is rust prevention. Therefore, its thickness can be smaller to reduce the manufacturing cost of the liquid cooling plate 100. The thickness of the second insulating and anti-corrosion layer 150 can be designed to be 50–150 μm.

[0102] In some embodiments, combined with Figure 6 and Figure 7It is understood that the flow channel plate 110 and the heat exchange plate 120 together form the installation area Q1 and the heat exchange area Q2 on the liquid cooling plate 100. The installation area Q1 is located on the periphery of the heat exchange area Q2, the heat exchange flow channel 111 is located in the heat exchange area Q2, and the first insulating and anti-corrosion layer 140 avoids the installation area Q1.

[0103] Mounting area Q1 is located at the edge of liquid cooling plate 100, through which liquid cooling plate 100 is fixed to battery box 200. Mounting area Q1 and battery box 200 are typically welded. The first insulating and anti-corrosion layer 140 avoids mounting area Q1, mainly considering that after welding liquid cooling plate 100 and battery box 200, the first insulating and anti-corrosion layer 140 may melt and penetrate into the welding area, causing poor welding. In one application scenario, heat exchange plate 120 located in mounting area Q1 is welded to the side beam of battery box 200.

[0104] In one embodiment, the second anti-corrosion layer also avoids the mounting area Q1. Considering that in some applications, the portion of the flow channel plate 110 located in the mounting area Q1 is used for welding to the battery box 200, the second anti-corrosion layer needs to avoid the welding area to prevent the second insulating anti-corrosion layer 150 from melting and penetrating into the welding area, causing poor welding.

[0105] In some embodiments, combined with Figure 7 and Figure 14 Understandably, the flow channel plate 110 and the heat exchange plate 120 together form a fixed connection area Q3 on the liquid cooling plate 100. The heat exchange area Q2 surrounds the fixed connection area Q3. The fixed connection area Q3 is provided with a fixed connection hole 122 that penetrates the heat exchange plate 120 and the flow channel plate 110. The first insulating and anti-corrosion layer 140 and the second insulating and anti-corrosion layer 150 avoid the fixed connection area Q3.

[0106] Understandably, the heat exchange channel 111 avoids the fixed connection area Q3 to prevent leakage. In one application scenario, the liquid cooling plate 100 is fixed to the beam structure of the battery box 200 through the fixed connection hole 122 in the fixed connection area Q3, improving the installation reliability of the liquid cooling plate 100. If the first insulating and anti-corrosion layer 140 and the second insulating and anti-corrosion layer 150 are provided in the fixed connection area Q3, it will affect the actual size of the fixed connection hole 122, that is, affect the connection stability of the liquid cooling plate 100, and the fixed parts cannot be smoothly installed at the fixed connection hole 122, increasing the installation difficulty of the liquid cooling plate 100.

[0107] In some embodiments, the flow channel plate 110 further includes a concave-convex portion 112 recessed in the first surface M and protruding out of the second surface N. The heat exchange plate 120 closes the concave-convex portion 112, and the concave-convex portion 112 is independent of the heat exchange flow channel 111. A plurality of concave-convex portions 112 are arranged longitudinally side by side, and a second vent hole 113 is provided between adjacent concave-convex portions 112. The second vent hole 113 is disposed through the flow channel plate 110 and avoids the heat exchange flow channel 111.

[0108] The concave and convex portions 112 form independent spaces in which no heat exchange medium flows. Each concave and convex portion 112 is arranged longitudinally in the same direction, and multiple concave and convex portions 112 are arranged side by side along the longitudinal direction. A second exhaust hole 113 is machined on the flow channel plate 110 between adjacent concave and convex portions 112, and the second exhaust hole 113 passes through the flow channel plate 110.

[0109] In practical applications, while forming the heat exchange channel 111 by stamping on the flow channel plate 110, a concave-convex portion 112 is also stamped on it. When assembling the liquid cooling plate 100, the portions of the heat exchange plate 120 and the flow channel plate 110 near the concave-convex portion 112 are welded. The concave-convex portion 112 not only enhances the strength of the flow channel plate 110 and prevents stamping cracks caused by uneven material flow of the liquid cooling plate 100 during the stamping process, but also takes into account the venting requirements during the welding of the heat exchange plate 120 and the flow channel plate 110, avoiding the presence of air between the flow channel plate 110 and the heat exchange plate 120, which could lead to local bulging and affect the strength and flatness of the flow channel plate 110.

[0110] Moreover, in response to exhaust requirements, the concave and convex portions 112 are divided into multiple portions, each of which is relatively short in length. A second exhaust hole 113 is provided between each adjacent concave and convex portion 112. Compared with the continuously arranged long strip-shaped concave and convex portions 112, the exhaust path is shorter, which can speed up exhaust and quickly balance the negative pressure.

[0111] In some embodiments, refer to Figure 7 The flow channel plate 110 is provided with a reinforcing protrusion 114, which protrudes from the second surface N and is located on different sides of the flow channel plate 110 from the edge flow channel 111a.

[0112] Generally, the reinforcing protrusions 114 are stamped onto the first surface M of the flow channel plate 110 and protrude relative to the second surface N, so as to be formed simultaneously during the stamping process of the heat exchange flow channel 111, simplifying the preparation of the flow channel plate 110 and improving the structural strength of the flow channel plate 110. Alternatively, multiple reinforcing protrusions 114 may be configured and distributed at both ends of the flow channel plate 110.

[0113] In some embodiments, refer to Figure 12 The reinforcing plate 130 includes a first layer plate 130a and a second layer plate 130b stacked together. The thickness of the first layer plate 130a is less than the thickness of the second layer plate 130b. The first layer plate 130a is made of 4-series aluminum, and the second layer plate 130b is made of 3-series aluminum. The second layer plate 130b is bonded and connected to the second surface N.

[0114] 3-series aluminum has excellent weldability and higher corrosion resistance than 4-series aluminum. 4-series aluminum has good crack resistance. By using 3-series aluminum for the inner second layer plate 130b and 4-series aluminum for the outer first layer plate 130a, we can not only ensure easy welding, but also improve the strength, crack resistance and corrosion resistance of the reinforcing plate 130.

[0115] In one specific embodiment of this application, the liquid cooling plate 100 includes the aforementioned flow channel plate 110, the aforementioned heat exchange plate 120, and the aforementioned reinforcing plate 130. The reinforcing plate 130 includes the aforementioned middle section 132, the aforementioned transition section 133, and the aforementioned edge section 131. The middle section 132, the transition section 133, and the edge section 131 are all fitted and connected to the non-flow channel surfaces N1 on both sides of the edge flow channel 111a, and the middle section 132 and the transition section 133 are fitted to the outer bottom wall a11 surface of the edge flow channel 111a, and respectively form a first gap j1 and a second gap j2 with the outer side wall a12 of the edge flow channel 111a. The edge section 131 is fully connected to the outer wall surface a1 of the edge flow channel 111a, and closes the closed space J formed by the first gap j1 and the second gap j2.

[0116] Furthermore, the battery pack 1000 proposed in this application includes a battery box 200, a liquid cooling plate 100 as described in the above embodiments, and battery cells 300. The liquid cooling plate 100 is fixedly connected to the battery box 200, and the battery cells 300 are disposed inside the battery box 200 and thermally connected to the heat exchange plate 120. This battery pack 1000 incorporates all the beneficial effects described in the above embodiments.

[0117] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0118] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A liquid-cooled plate (100), characterized in that, include: The flow channel plate (110) has a first surface (M) and a second surface (N) disposed opposite to each other. The flow channel plate (110) includes a heat exchange channel (111) recessed in the first surface (M) and protruding relative to the second surface (N). The heat exchange channel (111) includes an edge channel (111a) located at the edge of the flow channel plate (110). A heat exchange plate (120) covers the first surface (M) and seals the heat exchange channel (111); A reinforcing plate (130) is disposed on the second surface (N). The reinforcing plate (130) is disposed longitudinally along the edge flow channel (111a) and covers the edge flow channel (111a). The four edges of the reinforcing plate (130) are attached to the second surface (N) and form a closed space (J) with the second surface (N).

2. The liquid-cooled plate (100) according to claim 1, characterized in that, The second surface (N) includes a non-flow channel surface (N1) and a convex surface (N2), the convex surface (N2) being convex relative to the non-flow channel surface (N1), and the outer wall surface (a1) of the edge flow channel (111a) constituting the convex surface (N2); The reinforcing plate (130) includes an edge segment (131) and a middle segment (132), wherein the middle segment (132) is connected to the edge segment (131) at both ends in the longitudinal direction of the reinforcing plate (130); The non-flow channel surface (N1) located on at least one side of the edge flow channel (111a) is in close contact with both the middle section (132) and the edge section (131). The middle section (132) is partially in close contact with the outer wall surface (a1) and forms a first gap (j1) with the other part of the outer wall surface (a1). The edge section (131) is in close contact with the outer wall surface (a1) and closes the first gap (j1) to form the closed space (J).

3. The liquid-cooled plate (100) according to claim 2, characterized in that, The reinforcing plate (130) further includes a transition section (133) that connects the middle section (132) and the edge section (131); The transition section (133) is partially attached to the outer wall surface (a1) and forms a second gap (j2) with another part of the outer wall surface (a1). The second gap (j2) connects to the first gap (j1) and together constitutes the enclosed space (J). The width (w2) of the second gap (j2) increases from one end near the edge segment (131) to the other end, while the width (w1) of the first gap (j1) is equal everywhere.

4. The liquid-cooled plate (100) according to claim 3, characterized in that, The outer wall surface (a1) includes an outer bottom wall (a11) and an outer side wall (a12), the outer side wall (a12) being intersected and connected between the outer bottom wall (a11) and the non-flow channel surface (N1); The middle section (132) and the transition section (133) are both fitted and connected to the outer bottom wall (a11), and are respectively spaced from the outer side wall (a12) to form the first gap (j1) and the second gap (j2). The edge section (131) is fitted and connected to both the outer side wall (a12) and the outer bottom wall (a11) to close the enclosed space (J) formed by the first gap (j1) and the second gap (j2).

5. The liquid-cooled plate (100) according to claim 4, characterized in that, The edge segment (131), the transition segment (133), and the middle segment (132) are all fitted and connected to the non-flow channel surfaces (N1) on both sides of the edge flow channel (111a), and the middle segment (132) and the transition segment (133) are respectively spaced with the first gap (j1) and the second gap (j2) on both sides of the edge flow channel (111a) and the outer wall (a12); and / or, Along the longitudinal direction of the reinforcing plate (130), the length of the middle section (132), the length of the transition section (133), and the length of the edge section (131) decrease sequentially.

6. The liquid-cooled plate (100) according to claim 2, characterized in that, A first vent (134) is provided on the middle section (132), and the first vent (134) is located in the area of ​​the middle section (132) that is in contact with the outer wall surface (a1).

7. The liquid-cooled plate (100) according to any one of claims 1-6, characterized in that, The liquid cooling plate (100) includes a first insulating and anti-corrosion layer (140) and / or a second insulating and anti-corrosion layer (150); The heat exchange plate (120) includes a heat exchange surface (121) which is disposed opposite to the first surface (M). The first insulating and anti-corrosion layer (140) is disposed on the heat exchange surface (121), and the second insulating and anti-corrosion layer (150) is disposed on the second surface (N) and covers the reinforcing plate (130).

8. The liquid-cooled plate (100) according to claim 7, characterized in that, The liquid-cooled plate (100) includes a first insulating and anti-corrosion layer (140) and a second insulating and anti-corrosion layer (150), wherein the thickness of the first insulating and anti-corrosion layer (140) is greater than the thickness of the second insulating and anti-corrosion layer (150); and / or, The thickness of the first insulating and anti-corrosion layer (140) is 150-300 μm, and the thickness of the second insulating and anti-corrosion layer (150) is 50-150 μm; and / or, The flow channel plate (110) and the heat exchange plate (120) together form an installation area (Q1) and a heat exchange area (Q2) on the liquid cooling plate (100). The installation area (Q1) is located around the heat exchange area (Q2), and the heat exchange flow channel (111) is located in the heat exchange area (Q2). The first insulating and anti-corrosion layer (140) avoids the installation area (Q1); and / or, The flow channel plate (110) and the heat exchange plate (120) together form a fixed area (Q3) on the liquid cooling plate (100). The heat exchange area (Q2) surrounds the fixed area (Q3). The fixed area (Q3) is provided with a fixed hole (122) penetrating the heat exchange plate (120) and the flow channel plate (110). The first insulating and anti-corrosion layer (140) and the second insulating and anti-corrosion layer (150) avoid the fixed area (Q3).

9. The liquid-cooled plate (100) according to claim 1, characterized in that, The flow channel plate (110) further includes a recessed portion (112) recessed in the first surface (M) and protruding from the second surface (N), the heat exchange plate (120) enclosing the recessed portion (112), the recessed portion (112) being independent of the heat exchange flow channel (111); a plurality of the recessed portions (112) are arranged longitudinally side by side, and a second exhaust hole (113) is provided between adjacent recessed portions (112), the second exhaust hole (113) penetrating the flow channel plate (110), the second exhaust hole (113) avoiding the heat exchange flow channel (111); and / or, The flow channel plate (110) is provided with a reinforcing protrusion (114), which protrudes from the second surface (N) and is located on different sides of the flow channel plate (110) from the edge flow channel (111a); and / or, The reinforcing plate (130) includes a first layer plate (130a) and a second layer plate (130b) stacked together. The thickness of the first layer plate (130a) is less than the thickness of the second layer plate (130b). The first layer plate (130a) is made of 4-series aluminum, and the second layer plate (130b) is made of 3-series aluminum. The second layer plate (130b) is bonded to the second surface (N).

10. A battery pack (1000), characterized in that, include: Battery box (200); The liquid cooling plate (100) as described in any one of claims 1-9 is fixedly connected to the battery box (200); A battery cell (300) is disposed inside the battery box (200) and is thermally connected to the heat exchange plate (120).

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