Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device.The battery device comprises a single battery, a cold plate and a heat conduction layer, the cold plate is arranged on the upper surface of the single battery, a liquid inlet and a liquid outlet are formed in the cold plate, a through cooling channel is formed in the cold plate, and the liquid inlet and the liquid outlet are communicated with the cooling channel; the cold plate is composed of convex parts and concave parts which are alternately arranged, the pole columns on the battery monomers are located in the concave parts, the other areas of the upper surfaces of the battery monomers are in contact with the convex parts, and the heat conduction layer is arranged between the concave parts and the busbars on the battery monomers. According to the scheme provided by the invention, when the cold plate is arranged on the upper surface of the battery monomer, the corresponding pole is positioned in the concave part, at the moment, the upper surface of the pole is in contact with one side, facing the pole, of the concave part, the side surface of the pole is in contact with the inner wall of the concave part, and the rest area is in contact with the convex part; therefore, the post terminal can be quickly cooled through the concave part, and the overall cooling efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device and a power utilization device. BACKGROUND

[0002] In the thermal management design of high-energy-density power battery modules, the scheme of using a cold plate to locally cool the battery cell is increasingly highlighting its limitations.

[0003] The cold plate in the related art cannot effectively cool the pole when in use. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery device and a power utilization device, which can solve the problem that the cold plate cannot effectively cool the pole when in use.

[0005] To solve the above technical problems, in a first aspect, the present application provides a battery device, comprising:

[0006] a battery cell;

[0007] a cold plate, the cold plate being arranged on the upper surface of the battery cell, the cold plate being provided with a liquid inlet and a liquid outlet, the cold plate being provided with a cooling channel therethrough, the liquid inlet and the liquid outlet being in communication with the cooling channel; the cold plate being composed of alternating convex portions and concave portions, the pole on the battery cell being located in the concave portion, and the remaining area of the upper surface of the battery cell being in contact with the convex portion;

[0008] a heat-conducting layer, the heat-conducting layer being arranged between the concave portion and the bus bar on the battery cell.

[0009] In the technical scheme of the present application, when the cold plate is arranged on the upper surface of the battery cell, the corresponding pole is located in the concave portion, at this time, the upper surface of the pole is in contact with the side of the concave portion facing the pole, the side surface of the pole is in contact with the inner wall of the concave portion, and the remaining area is in contact with the convex portion, when the cooling liquid is injected into the cold plate, the pole can be quickly cooled through the concave portion, and the overall cooling efficiency is effectively improved. At the same time, the heat generated on the bus bar can be quickly transferred to the concave portion through the heat-conducting layer, thereby improving the cooling efficiency of the bus bar.

[0010] In some embodiments, the heat-conducting layer is a graphite-filled glue layer, and the thickness of the glue layer is 0.1-0.3 mm. When the thickness of the glue layer is less than 0.1 mm, the glue layer is too thin, and pinholes and local glue defects are likely to occur, resulting in local high thermal resistance points. When the thickness of the glue layer is greater than 0.3 mm, the longitudinal thermal resistance of the glue layer increases linearly, the heat loss through the glue layer increases, and the heat-conducting efficiency drops sharply. When the thickness of the glue layer is 0.1-0.3 mm, the longitudinal thermal resistance is extremely low and uniform, and the heat can be transmitted from the bus bar to the recess without loss. In addition, the graphite has a high thermal conductivity, which effectively improves the high-thermal-conductivity performance of the overall heat-conducting layer.

[0011] In some embodiments, the cross section of the cooling channel is trapezoidal.

[0012] Since the inner wall of the trapezoidal cross-section channel is a sloping surface, the cooling liquid flowing in the cooling channel has no right-angle dead angle and no cross-section mutation. The flow boundary layer of the liquid does not accumulate in the corner, and the flow resistance is lower than that of a rectangular channel.

[0013] In some embodiments, the cooling channel is provided with a turbulence column along the direction of the cooling liquid. In this way, the cooling liquid is uniformly distributed in the entire cooling channel through the flow and flow around the turbulence column, and the flow rate and residence time are consistent. There is no dead water zone and low-speed zone in the channel, which improves the convective heat transfer effect in the cooling channel and further facilitates heat dissipation and cooling.

[0014] In some embodiments, the battery device further comprises an insulating layer arranged between the recess and the pole. In this way, the electrical contact between the pole and the recess can be avoided.

[0015] In some embodiments, the battery device further comprises a detection member arranged on the surface of the cold plate and configured to detect the temperature of the cold plate. In this way, the temperature of the cold plate can be conveniently detected.

[0016] In some embodiments, the battery device further comprises a thermal insulation layer arranged on the side of the cold plate away from the battery monomer. In this way, external heat can be prevented from being transmitted to the cold plate.

[0017] In some embodiments, the cold plate is provided with a reinforcing rib on the side away from the battery monomer. In this way, the strength of the overall cold plate can be improved.

[0018] In some embodiments, the side of the convex part facing the battery monomer is a rough surface configured to increase the bonding area between the convex part and the battery monomer.

[0019] In a second aspect, the present application provides a power-using device comprising the battery device as any one of the embodiments of the present application.

[0020] The above description is merely a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application and implement the same, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent, the following will specifically describe the embodiments of the present application with reference to the contents of the description. BRIEF DESCRIPTION OF DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The accompanying drawings are merely illustrative and are not considered limiting of the present application. Rather, the accompanying drawings are intended to illustrate the embodiments of the present application. Moreover, like reference numerals denote like elements throughout the several views of the drawings. In the drawings:

[0022] Figure 1 Structure schematic diagram of a power-using device provided by some embodiments of the present application;

[0023] Figure 2 Structure schematic diagram of a battery provided by some embodiments of the present application;

[0024] Figure 3 Structure schematic diagram of a battery cell provided by some embodiments of the present application;

[0025] Figure 4 Structure schematic diagram of a battery device provided by some embodiments of the present application;

[0026] Figure 5 Cold plate schematic diagram provided by some embodiments of the present application.

[0027] Reference numerals in the detailed description are as follows:

[0028] 1000, vehicle;

[0029] 100, battery; 200, controller; 300, motor; 400, cold plate;

[0030] 110, box body; 111, first part; 112, second part; 120, battery cell; 121, shell; 122, end cover; 1221, pole; 123, electrode assembly;

[0031] 410, protrusion; 420, recess; 430, liquid inlet; 440, liquid outlet. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "coupled" as used herein means the joining of two members together with one or more intervening members.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0035] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0037] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] In the thermal management design of high-energy-density power battery modules, the scheme of using cold plates to locally cool the battery cells is increasingly highlighting its limitations.

[0041] In the related art, the cooling area of the cold plate only covers the upper surface of the battery cell shell, and cannot effectively manage the key heat generating parts such as the pole, resulting in local heat accumulation and low cooling efficiency.

[0042] Based on the above considerations, in order to solve the problem that the cold plate cannot effectively cool the pole when in use, a battery device is designed, which comprises a battery monomer, a cold plate and a heat-conducting layer, wherein the cold plate is arranged on the upper surface of the battery monomer, the cold plate is provided with a liquid inlet and a liquid outlet, the cold plate is provided with a through cooling channel, and the liquid inlet and the liquid outlet are communicated with the cooling channel; the cold plate is composed of alternating convex parts and concave parts, the pole on the battery monomer is located in the concave part, the remaining area of the upper surface of the battery monomer is in contact with the convex part, and the heat-conducting layer is arranged between the concave part and the bus bar on the battery monomer.

[0043] In the technical scheme of the embodiments of the present application, when the cold plate is arranged on the upper surface of the battery monomer, the corresponding pole is located in the concave part, at this time, the upper surface of the pole is in contact with the side of the concave part facing the pole, the side surface of the pole is in contact with the inner wall of the concave part, and the remaining area is in contact with the convex part, when the cold plate is injected with cooling liquid, the pole can be quickly cooled through the concave part, and the overall cooling efficiency is effectively improved. At the same time, the heat generated on the bus bar can be quickly transferred to the concave part through the heat-conducting layer, thereby improving the cooling efficiency of the bus bar.

[0044] The battery in the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery pack and the like. The battery can be used as a power supply or a power supply system of an electric device, so as to improve the overall performance of the battery and facilitate the promotion of the battery.

[0045] The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy and the like. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0046] The following embodiments are described by taking a vehicle 1000 as an example for convenience of description.

[0047] Please refer to Figure 1 , Figure 1 The vehicle 1000 provided in some embodiments of the present application is a structural schematic diagram. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile and the like. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0048] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0049] Please refer to Figure 2 , Figure 2This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 110 and a battery cell 120, with the battery cell 120 housed within the housing 110. The housing 110 provides a accommodating space for the battery cell 120, and the housing 110 can adopt various structures. In some embodiments, the housing 110 may include a first portion 111 and a second portion 112, which overlap each other, and together define a accommodating space for accommodating the battery cell 120. The second portion 112 may be a hollow structure with one open end, and the first portion 111 may be a plate-like structure, with the first portion 111 covering the open side of the second portion 112 so that the first portion 111 and the second portion 112 together define the accommodating space; alternatively, the first portion 111 and the second portion 112 may both be hollow structures with one open side, with the open side of the first portion 111 covering the open side of the second portion 112. Of course, the box 110 formed by the first part 111 and the second part 112 can be of various shapes, such as cylinder, cuboid, etc.

[0050] In battery 100, there can be multiple battery cells 120. These multiple battery cells 120 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 120 are connected in both series and parallel. Multiple battery cells 120 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 120 is housed within housing 110. Alternatively, battery 100 can also consist of multiple battery cells 120 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within housing 110. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for electrical connection between multiple battery cells 120.

[0051] Each battery cell 120 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 120 can be cylindrical, flat, cuboid, or other shapes.

[0052] like Figure 3 As shown, the battery cell 120 may include a housing, an electrode assembly 123, and electrode terminals. The housing includes a casing 121 and an end cap 122. The casing 121 has an opening, and the end cap 122 closes the opening to isolate the internal environment of the battery cell 120 from the external environment.

[0053] The shell 121 is a component for fitting the end cover 122 to form an internal environment of the battery cell 120, wherein the formed internal environment can be used to accommodate the electrode assembly 123, electrolyte and other components. The shell 121 and the end cover 122 can be independent components. The shell 121 can be of various shapes and sizes. Specifically, the shape of the shell 121 can be determined according to the specific shape and size of the electrode assembly 123. The material of the shell 121 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0054] The end cover 122 refers to a component that covers the opening of the shell 121 to isolate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cover 122 can be adapted to the shape of the shell 121 to fit the shell 121. Optionally, the end cover 122 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 122 is not easily deformed when subjected to extrusion collision, so that the battery cell 120 can have higher structural strength, and the reliability can also be improved. The end cover 122 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 123 for outputting or inputting the electrical energy of the battery cell 120. The material of the end cover 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 122, which can be used to isolate the electrical connection components in the shell 121 from the end cover 122 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0055] The electrode assembly 123 is a component in which electrochemical reactions occur in the battery cell 120. One or more electrode assemblies 123 can be contained in the shell 121. The electrode assembly 123 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and generally has a separator film between the positive electrode sheet and the negative electrode sheet, which is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion of active material constituting the main body of the electrode assembly 123, and a portion without active material constituting the tab of the positive electrode sheet and the negative electrode sheet, respectively. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at two ends of the main body, respectively. During the charging and discharging process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop. In addition, the electrode assembly 123 can be of a winding type structure or a stacking type structure.

[0056] In some embodiments, the battery cell 120 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 120 when the internal pressure or temperature of the battery cell 120 reaches a threshold value.

[0057] According to some embodiments of the present application, as Figure 4 and in combination Figure 5 As shown in the drawings, the present application provides a battery device, which comprises a battery monomer 120, a cold plate 400 and a heat-conducting layer, wherein the cold plate 400 is arranged on the upper surface of the battery monomer 120, the cold plate 400 is provided with a liquid inlet 430 and a liquid outlet 440, the cold plate 400 is provided with a cooling channel penetrating through the inside, and the liquid inlet 430 and the liquid outlet 440 are in communication with the cooling channel; the cold plate 400 is composed of alternating convex parts 410 and concave parts 420, the pole 1221 on the battery monomer 120 is located in the concave part 420, and the remaining area of the upper surface of the battery monomer 120 is in contact with the convex part 410; the heat-conducting layer is arranged between the concave part 420 and the bus bar on the battery monomer 120.

[0058] The structure of the battery monomer 120 in the embodiment can refer to the description above, which will not be repeated here.

[0059] The heat-conducting layer in the embodiment can be a graphene layer, which is not limited here.

[0060] In the embodiment, the cold plate 400 can be an aluminum plate body, an alloy plate body, etc., which is not limited here. The liquid inlet 430 and the liquid outlet 440 are integrally formed with the cold plate 400, and the number of the convex parts 410 and the concave parts 420 on the cold plate 400 is not limited.

[0061] The cold plate 400 and the battery monomer 120 in the embodiment can be welded together by a surface vacuum brazing process, so that the cold plate 400 can be stably fixed on the battery monomer 120.

[0062] In the technical solution of the embodiment of the present application, when the cold plate 400 is fixed to the upper surface of the battery monomer 120, the corresponding pole 1221 is located in the concave part 420, the upper end of the pole 1221 is in contact with the side of the concave part 420 facing the pole 1221, the side surface of the pole 1221 is in contact with the inner wall of the concave part 420, and the remaining area is in contact with the convex part 410. When the cooling liquid is injected into the cold plate 400, the pole 1221 can be quickly cooled through the concave part 420, effectively improving the overall cooling efficiency.

[0063] At the same time, when the cold plate 400 is fixed to the upper surface of the battery monomer 120, the heat-conducting layer is filled between the concave part 420 and the corresponding bus bar, so that the heat generated by the bus bar can be quickly transmitted to the concave part through the heat-conducting layer, improving the cooling efficiency of the bus bar.

[0064] According to some embodiments of the present application, the heat-conducting layer is a uniform heating layer formed by graphene-filled glue, and the thickness of the uniform heating layer is 0.1mm-0.3mm. Of course, it can be understood that the heat-conducting layer in the present embodiment can also be a heat-conducting silicone layer or a high-heat-conducting gel layer, which is not limited herein.

[0065] When the uniform heating layer is <0.1mm, the glue layer is too thin, and pinholes or local glue defects are prone to occur, resulting in local high thermal resistance points. When the uniform heating layer is >0.3mm, the longitudinal thermal resistance of the glue layer will increase linearly, the heat loss through the glue layer will be larger, and the heat-conducting efficiency will drop sharply. When the thickness of the uniform heating layer is 0.1mm-0.3mm, the longitudinal thermal resistance is extremely low and uniform, the heat can be transmitted from the bus bar to the recess almost without loss, and the high-heat-conducting performance of the overall heat-conducting layer is effectively improved due to the high thermal conductivity of graphene itself.

[0066] According to some embodiments of the present application, the cross section of the cooling channel is trapezoidal.

[0067] Since the inner wall of the trapezoidal cross-section channel is a bevel transition, there is no right-angle dead angle or cross-section mutation when the cooling liquid flows in the cooling channel, and the flow boundary layer of the liquid will not accumulate in the corner, and the flow resistance is lower than that of the rectangular channel.

[0068] According to some embodiments of the present application, a turbulence column is arranged in the cooling channel along the direction of the cooling liquid. In this way, through the flow separation and flow around of the turbulence column, the cooling liquid can be uniformly distributed in the entire cooling channel, the flow rate and residence time are consistent, there is no dead water area or low-speed area in the channel, and the convective heat transfer effect in the cooling channel is improved, which is further beneficial to heat dissipation and cooling.

[0069] According to some embodiments of the present application, the battery device further comprises an insulating layer arranged between the recess 420 and the pole 1221.

[0070] The insulating layer in the present embodiment can be a polyimide ceramic composite coating with a thickness of 20-50μm, which is not limited herein.

[0071] In use, by arranging the insulating layer between the recess 420 and the pole 1221, electrical contact between the pole 1221 and the recess 420 can be avoided.

[0072] According to some embodiments of the present application, the battery device further comprises a detection member arranged on the surface of the cold plate 400 and configured to detect the temperature of the cold plate 400.

[0073] The detection member in the present embodiment can be a temperature sensor which can be bonded on the surface of the cold plate 400, which is not limited herein.

[0074] In use, the temperature of the cold plate 400 is detected by the detecting member, and when the temperature of the cold plate 400 exceeds a certain value, the electrolyte is injected through the liquid inlet 430.

[0075] According to some embodiments of the present application, the battery device further comprises a heat insulation layer, which is arranged on the side of the cold plate 400 away from the battery monomer 120.

[0076] The heat insulation layer in the embodiment can be a zirconium oxide-based nano heat insulation material, which is not limited herein.

[0077] By spraying the heat insulation layer on the side of the cold plate 400 away from the battery monomer 120, external heat can be prevented from being transferred to the cold plate 400.

[0078] According to some embodiments of the present application, the side of the cold plate 400 away from the battery monomer 120 is provided with a reinforcing rib.

[0079] The reinforcing rib in the embodiment can be integrally formed with the cold plate 400, or the reinforcing rib is welded on the cold plate 400, which is not limited herein.

[0080] The embodiment improves the strength of the cold plate 400 as a whole by arranging the reinforcing rib on the cold plate 400.

[0081] According to some embodiments of the present application, the side of the convex part 410 facing the battery monomer 120 is a rough surface, which is configured to increase the bonding area between the convex part 410 and the battery monomer 120.

[0082] In this way, when the convex part 410 and the battery monomer 120 are bonded by the adhesive layer, the bonding area between the convex part 410 and the battery monomer 120 can be increased under the action of the rough surface, thereby improving the bonding strength of the two.

[0083] The present application also provides a power consumption device comprising the battery device according to any one of the embodiments of the present application.

[0084] The specific structure of the battery device in the embodiment is referred to the above-mentioned embodiments, and since all the technical solutions of the above-mentioned embodiments are adopted in the power consumption device, at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are possessed, which will not be repeated here.

[0085] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Battery cell; A cold plate is disposed on the upper surface of the battery cell. The cold plate has an inlet and an outlet, and a through cooling channel is provided inside the cold plate. The inlet and the outlet are respectively connected to the cooling channel. The cold plate is composed of alternating convex and concave portions. The terminal post on the battery cell is located in the concave portion, and the remaining area of ​​the upper surface of the battery cell is in contact with the convex portion. A thermally conductive layer is disposed between the recess and the busbar on the battery cell.

2. The battery device according to claim 1, characterized in that, The thermally conductive layer is a heat-spreading layer formed by graphene-filled adhesive, and the thickness of the heat-spreading layer is 0.1mm-0.3mm.

3. The battery device according to claim 1 or 2, characterized in that, The cooling channel has a trapezoidal cross-section.

4. The battery device according to claim 3, characterized in that, A turbulence column is installed in the cooling channel along the direction of coolant inflow.

5. The battery device according to claim 1 or 2, characterized in that, The battery device further includes an insulating layer disposed between the recess and the terminal post.

6. The battery device according to claim 1 or 2, characterized in that, The battery device also includes a detection element disposed on the surface of the cold plate and configured to detect the temperature of the cold plate.

7. The battery device according to claim 1 or 2, characterized in that, The battery device also includes a heat insulation layer disposed on the side of the cold plate away from the battery cell.

8. The battery device according to claim 1 or 2, characterized in that, The side of the cold plate opposite to the battery cell is provided with reinforcing ribs.

9. The battery device according to claim 1 or 2, characterized in that, The side of the protrusion facing the battery cell is a rough surface, which is configured to increase the bonding area between the protrusion and the battery cell.

10. An electrical device, characterized in that, Includes the battery device as described in any one of claims 1 to 9.

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