Battery and electric device

Abstract

The utility model discloses a battery and an electric device. The battery comprises a battery monomer and a box body, and the battery monomer is accommodated in the box body; the box body comprises a first plate body and a second plate body, the first plate body is in heat conduction connection with the battery monomers, the second plate body is stacked on one side, deviating from the battery monomers, of the first plate body and is connected with the first plate body, a flow channel is formed between the first plate body and the second plate body, and the flow channel is used for accommodating a heat exchange medium so as to exchange heat with the battery monomers; wherein the heat conductivity coefficient of the second plate body is smaller than that of the first plate body. Heat exchange is achieved through the first plate body with the high heat conductivity coefficient and the battery single body, the heat exchange efficiency of the battery single body and a heat exchange medium in the flow channel is guaranteed, the second plate body is arranged on the side, away from the battery single body, of the first plate body, the heat preservation performance of the box body can be improved through the characteristic that the heat conductivity coefficient of the second plate body is low, and therefore a heat preservation structure does not need to be designed; the integration degree is high, and the processing and assembling efficiency of the battery is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery and an electrical device using the same. Background Art

[0002] In the related art, a battery is provided for installation on a vehicle body. The battery has a box body and a water-cooling plate. The box body is installed on the vehicle body, and the water-cooling plate is installed inside the box body to dissipate heat from the battery cells. However, the battery also needs to cover a heat-insulating structure outside the water-cooling plate to improve the heat dissipation efficiency of the water-cooling plate for the battery cells, but this also results in a low degree of integration of the battery, making the processing and assembly efficiency of the battery low. Summary of the Utility Model

[0003] In view of the above problems, this application provides a battery and an electrical device using the same to improve the degree of integration of the battery.

[0004] In a first aspect, this application provides a battery, including battery cells and a box body. The battery cells are accommodated in the box body. The box body includes a first plate body and a second plate body. The first plate body is thermally connected to the battery cells. The second plate body is stacked on a side of the first plate body facing away from the battery cells and is connected to the first plate body. A flow channel is formed between the first plate body and the second plate body. The flow channel is used to accommodate a heat exchange medium to perform heat exchange with the battery cells. Wherein, the thermal conductivity of the second plate body is less than that of the first plate body.

[0005] In the technical solution of the embodiment of this application, the box body includes a first plate body and a second plate body. A flow channel is defined between the first plate body and the second plate body. The box body exchanges heat with the battery cells through the first plate body with a high thermal conductivity to ensure the heat exchange efficiency between the battery cells and the heat exchange medium in the flow channel. And the second plate body is arranged on a side of the first plate body facing away from the battery cells. Utilizing the characteristic of the low thermal conductivity of the second plate body, the heat insulation performance of the box body can be improved, so that there is no need to design a heat insulation structure again, with a high degree of integration, and the processing and assembly efficiency of the battery is improved.

[0006] In some embodiments, the thermal conductivity of the second plate body is 0.031 W / (m·K) to 1 W / (m·K). Thus, the thermal conductivity of the second plate body is relatively low, and the heat insulation performance of the box body is better.

[0007] In some embodiments, the density of the second plate body is less than that of the first plate body. The lower density of the second plate body makes the weight of the box body lighter, meeting the requirements of vehicle lightweight.

[0008] In some embodiments, the first plate body is a metal part, and the second plate body is a plastic part. The metal part has a high thermal conductivity, which can improve the heat exchange efficiency between the battery cell and the cooling medium in the flow channel. The plastic part has a much lower thermal conductivity than the metal part, which can improve the heat preservation performance of the box body. In addition, the plastic part has a low density, making the box body lighter and meeting the requirements of vehicle lightweight. Moreover, the plastic part has good corrosion resistance, making the service life of the box body longer.

[0009] In some embodiments, the material of the first plate body is an iron-based material or an aluminum-based material, and the material of the second plate body is polyphenylene sulfide or polyphthalamide. The iron-based material and the aluminum-based material have high thermal conductivities, which can ensure the heat exchange efficiency between the battery cell and the cooling medium in the flow channel; polyphenylene sulfide or polyphthalamide has characteristics such as low thermal conductivity, low density, and excellent corrosion resistance.

[0010] In some embodiments, the first plate body and the second plate body are thermally pressed and connected to seal the flow channel. Through the thermal pressing process, the first plate body and the second plate body can be connected, and the connection interface between the first plate body and the second plate body can be sealed, thereby realizing the sealing of the flow channel, and the manufacturing process is simple and reliable.

[0011] In some embodiments, the second plate body is recessed in a direction away from the first plate body to form a groove, the first plate body is in a flat plate structure, and a part of the first plate body covers the groove to form the flow channel. In this embodiment, only the groove needs to be formed on the second plate body, and the first plate body is in a flat plate structure without processing a groove on the first plate body, so the manufacturing process is simpler.

[0012] In some embodiments, the depth of the groove is 2 mm to 4 mm. In this way, the flow resistance of the groove is small, and it avoids occupying too much space in the thickness direction of the box body, and it is also convenient for the processing and forming of the second plate body, reducing the manufacturing difficulty.

[0013] In some embodiments, the thickness of the second plate body at the position corresponding to the groove is 3 mm to 4 mm. In this way, under the condition of small occupation of the space in the thickness direction of the box body, the second plate body has high bearing strength and has a good heat preservation effect on the box body.

[0014] In some embodiments, the second plate body is provided with an inlet and an outlet, and the inlet and the outlet respectively penetrate through the second plate body along the thickness direction of the second plate body and communicate with the flow channel. Thus, the inlet and the outlet are located outside the box body, so as to be far away from the battery cells inside the box body, reducing the influence on the battery cells after the heat exchange medium leaks from the inlet and the outlet.

[0015] In some embodiments, the box body further includes a first pipe body and a second pipe body. The first pipe body and the second pipe body are connected to the second plate body and integrally formed with the second plate body. The first pipe body is in communication with the inlet, and the second pipe body is in communication with the outlet. The first pipe body and the second pipe body facilitate the introduction and export of the heat exchange medium in the flow channel. The first pipe body, the second pipe body and the second plate body are integrally formed, with a simple manufacturing process, and the first pipe body, the second pipe body and the second plate body are tightly connected, which can greatly reduce the risk of heat exchange medium leakage.

[0016] In some embodiments, the box body further includes a sealant layer. The sealant layer is disposed between the second plate body and the first plate body and adhesively bonded to the second plate body and the first plate body to seal the flow channel. The sealant layer can both connect the second plate body and the first plate body and seal the connection interface between the second plate body and the first plate body, thereby realizing the sealing of the flow channel.

[0017] In some embodiments, the thickness of the sealant layer is 0.5 mm to 1.5 mm. By controlling the thickness of the sealant layer within this range, it is possible to have sufficient connection strength between the second plate body and the first plate body while saving the amount of the sealant layer, and reduce the risk of heat exchange medium leakage caused by interface peeling.

[0018] In some embodiments, the box body includes a first part and a second part. The first part and the second part cover each other to form a receiving space, and the battery cell is received in the receiving space. The first part and / or the second part includes the first plate body and the second plate body. Thus, the box body not only serves as the outer shell of the battery, but also integrates the heat exchange function and the heat preservation function, with a high degree of integration and can meet the lightweight requirements of the whole vehicle.

[0019] In a second aspect, the present application provides an electrical device, including the battery described in the first aspect, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a schematic structural diagram of an electrical device disclosed in an embodiment of the present application;

[0022] Figure 2 is an exploded structural diagram of a battery disclosed in an embodiment of the present application;

[0023] Figure 3 It is a schematic diagram of the explosion structure of the battery disclosed in another embodiment of the present application;

[0024] Figure 4 is Figure 3 a schematic diagram of the structure of the box body disclosed in the illustrated embodiment;

[0025] Figure 5 is Figure 3 a schematic diagram of the exploded structure of the box body disclosed in the illustrated embodiment;

[0026] Figure 6 is Figure 3 a top view of the box body disclosed in the illustrated embodiment;

[0027] Figure 7 is Figure 6 a sectional view of the box body shown at A-A;

[0028] Figure 8 is Figure 7 an enlarged view of the box body shown at B;

[0029] Figure 9 It is a schematic diagram of the structure of the second plate body in the battery disclosed in an embodiment of the present application.

[0030] In the drawings, the drawings are not drawn to actual scale, and the markings are described as follows:

[0031] 1000, vehicle;

[0032] 100, battery; 200, vehicle body main body;

[0033] 300, box body; 310, first part; 320, second part; 330, accommodation space; 340, adhesive layer; 350, first plate body; 360, second plate body; 370, flow channel; 351, groove; 352, sealant layer; 361, inlet; 362, outlet; 380, first pipe body; 390, second pipe body;

[0034] 400, battery cell. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0037] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0038] In the description of this application, the term "plurality" means two or more (including two).

[0039] In the description of this application, the orientation or positional relationship indicated by technical terms such as "thickness", "bottom", "side", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0040] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] At present, in the automotive field, electric vehicles have become the mainstream trend for the future. As the most core power supply component of the whole vehicle, the battery determines key indicators such as the driving range, cost, and service life of the whole vehicle. In related technologies, a battery is provided for installation on a vehicle body. The battery has a box body and a water-cooled plate. The box body is installed on the vehicle body, and the water-cooled plate is installed in the box body to dissipate heat from the battery cells. However, the box body has the following problems: First, the box body is a sheet metal structure made of steel material, with a relatively high specific weight and high integration difficulty with the aluminum water-cooled plate. Second, both the box body and the water-cooled plate are separate structural parts, with a low degree of integration, resulting in low processing and assembly efficiency of the battery. Third, the aluminum water-cooled plate has a high corrosion risk. Fourth, additional thermal insulation structural parts are required outside the water-cooled plate, resulting in a low degree of integration of the battery, high design cost, and high manufacturing cost.

[0042] Based on the above considerations, an embodiment of the present application provides a battery, including battery cells and a box body. The battery cells are accommodated in the box body; the box body includes a first plate body and a second plate body. The first plate body is thermally connected to the battery cells. The second plate body is stacked on a side of the first plate body facing away from the battery cells and is connected to the first plate body. A flow channel is formed between the first plate body and the second plate body. The flow channel is used to accommodate a heat exchange medium to perform heat exchange with the battery cells; wherein, the thermal conductivity of the second plate body is less than that of the first plate body.

[0043] The above box body includes a first plate body and a second plate body. A flow channel is defined between the first plate body and the second plate body. The box body exchanges heat with the battery cells through the first plate body with a high thermal conductivity, ensuring the heat exchange efficiency between the battery cells and the heat exchange medium in the flow channel. And by arranging the second plate body on a side of the first plate body facing away from the battery cells and utilizing the characteristic of the low thermal conductivity of the second plate body, the heat preservation performance of the box body can be improved, so that there is no need to design an additional thermal insulation structure, with a high degree of integration and improved processing and assembly efficiency of the battery.

[0044] The battery and the electrical device disclosed in the embodiments of the present application can be used in electrical devices that use the battery as a power source or various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0045] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application for illustration.

[0046] Please refer to Figure 1 , Figure 1Schematic structural diagram of vehicle 1000 provided by some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Vehicle 1000 includes a battery 100 and a vehicle body main body 200, and the battery 100 is arranged on the vehicle body main body 200. The battery 100 can be arranged at the bottom, head or tail of the vehicle body main body 200. The battery 100 can be used for power supply of vehicle 1000. For example, the battery 100 can be used as the operating power source of vehicle 1000.

[0047] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of vehicle 1000, but also be used as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0048] Please refer to Figure 2 and Figure 3 , Figure 2 Explosion structural diagram of battery 100 provided by some embodiments of the present application, Figure 3 Explosion structural diagram of battery 100 provided by some other embodiments of the present application. The battery 100 can include a box body 300 and battery cells 400, and the battery cells 400 are accommodated in the box body 300. In the battery 100, there can be multiple battery cells 400, and the multiple battery cells 400 can be connected in series, in parallel or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 400. The multiple battery cells 400 can be directly connected in series, in parallel or in a hybrid connection together, and then the whole formed by the multiple battery cells 400 is accommodated in the accommodation space of the battery 100. Of course, the battery 100 can also be in the form that multiple battery cells 400 are first connected in series, in parallel or in a hybrid connection to form battery modules, and then the multiple battery modules are connected in series, in parallel or in a hybrid connection to form a whole and are accommodated in the box body 300. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component, and the busbar component is installed in the box body 300 and is used to realize the electrical connection among the multiple battery cells 400.

[0049] Among them, each battery cell 400 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, but is not limited thereto. The battery cell 400 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0050] The box body 300 can include a first part 310 and a second part 320, and the first part 310 and the second part 320 cover each other to form an accommodation space 330, and the battery cells 400 are accommodated in the accommodation space 330.

[0051] The first part 310 may be a hollow structure with one side open, and the second part 320 may be a plate-like structure, and the second part 320 covers the open side of the first part 310, so that the first part 310 and the second part 320 jointly define the accommodation space 330. The first part 310 and the second part 320 may also be hollow structures with one side open, and the open side of the first part 310 covers the open side of the second part 320. Of course, the box formed by the first part 310 and the second part 320 may be in various shapes, such as a cylinder, a cuboid, etc.

[0052] Among them, one of the first part 310 and the second part 320 is the upper shell of the battery 100, and the other is the lower shell of the battery 100. Figure 2 In the illustrated embodiment, the second portion 320 is the upper shell of the battery 100, and the first portion 310 is the lower shell of the battery 100. Figure 3 In the illustrated embodiment, the first portion 310 is an upper shell of the battery 100 , and the second portion 320 is a lower shell of the battery 100 .

[0053] The box body 300 may further include an adhesive layer 340, and the battery cell 400 is bonded and fixed to the surface of the first part 310 facing the second part 320 through the adhesive layer 340. The adhesive layer 340 may be made of structural adhesive, which can withstand a large load and has the advantages of aging resistance, corrosion resistance, and fatigue resistance, and can effectively improve the assembly stability of the battery cell 400.

[0054] Please refer to Figure 4 , Figure 5 and Figure 8 As shown, Figure 4 yes Figure 3 The schematic diagram of the structure of the box 300 disclosed in the embodiment shown in FIG. Figure 5 yes Figure 3 The exploded structural diagram of the box 300 disclosed in the embodiment shown in FIG. Figure 8 yes Figure 7 The box 300 is shown in an enlarged view at B. The box 300 may include a first plate 350 and a second plate 360, wherein the first plate 350 is thermally connected to the battery cell 400, the second plate 360 ​​is stacked on the side of the first plate 350 away from the battery cell 400, and is interconnected with the first plate 350, and a flow channel 370 is formed between the second plate 360 ​​and the first plate 350, and the flow channel 370 is used to accommodate a heat exchange medium to perform heat exchange with the battery cell 400. The thermal conductivity of the second plate 360 ​​is less than that of the first plate 350.

[0055] The first plate body 350 can be in a plate-like structure or a hollow structure with one end open. The first plate body 350 and the second part 320 are covered with each other to form a receiving space 330 for receiving the battery cell 400. The thermal connection between the battery cell 400 and the first plate body 350 can mean that the battery cell 400 is directly connected to the first plate body 350, or it can mean that the battery cell 400 is indirectly connected to the first plate body 350. For example, the battery cell 400 is directly fixed on the first plate body 350 through the adhesive layer 340. Or, the battery cell 400 is fixed on the thermal pad, and then the thermal pad is fixed on the first plate body 350, both of which can achieve the thermal connection between the first plate body 350 and the battery cell 400.

[0056] The second plate body 360 can be in a plate-like structure. The second plate body 360 is stacked on the side of the first plate body 350 facing away from the battery cell 400. The second plate body 360 can also be a hollow structure with one end open, and the second plate body 360 is sleeved on the side of the first plate body 350 facing away from the battery cell 400.

[0057] A part of the flow channel 370 along the thickness direction of the first plate body 350 can be formed by the depression of the surface of the first plate body 350, and the other part is formed by the depression of the surface of the second plate body 360. Or, the flow channel 370 is completely formed by the depression of the surface of the first plate body 350, and the surface of the second plate body 360 facing the first plate body 350 is a plane. Or the flow channel 370 is completely formed by the depression of the surface of the second plate body 360, and the surface of the first plate body 350 facing the second plate body 360 is a plane. The heat exchange medium in the flow channel 370 can be a liquid, or a gas, a phase change material (such as a solid-liquid phase change material), etc., as long as it can perform heat exchange with the battery cell 400.

[0058] The box body 300 includes the first plate body 350 and the second plate body 360. The flow channel 370 is defined between the first plate body 350 and the second plate body 360. The thermal conductivity of the second plate body 360 is less than that of the first plate body 350, that is, the ability of the second plate body 360 to conduct heat is lower than that of the first plate body 350. The box body 300 is thermally connected to the battery cell 400 through the first plate body 350 with a high thermal conductivity to ensure the heat exchange efficiency between the battery cell 400 and the heat exchange medium in the flow channel 370. And by arranging the second plate body 360 on the side of the first plate body 350 facing away from the battery cell 400, and using the characteristic of the low thermal conductivity of the second plate body 360, the heat preservation performance of the box body 300 can be improved, so that there is no need to design an additional heat preservation structure, the integration degree is high, the processing and assembly efficiency of the battery 100 is improved, and the weight of the box body 300 is lighter, meeting the requirements of vehicle lightweight.

[0059] In some embodiments, the thermal conductivity of the second plate body 360 is from 0.031 W / (m·K) to 1 W / (m·K). For example, the thermal conductivity of the second plate body 360 can be 0.031 W / (m·K), 0.034 W / (m·K), 0.05 W / (m·K), 0.07 W / (m·K), 0.1 W / (m·K), 0.2 W / (m·K), 0.36 W / (m·K), 0.4 W / (m·K), 0.46 W / (m·K), 0.7 W / (m·K), 0.8 W / (m·K), or 1 W / (m·K), etc.

[0060] Exemplarily, the material of the second plate body 360 can be plastic, and the thermal conductivity of plastic is generally in the range of 0.2 W / (m·K) to 0.46 W / (m·K).

[0061] The material of the second plate body 360 can also be thermally conductive plastic, which refers to adding thermal conductive fillers such as metal powder and ceramic particles into plastic material. The thermal conductivity of thermally conductive plastic is generally in the range of 0.1 W / (m·K) to 1 W / (m·K). Although the thermal conductivity of thermally conductive plastic is higher than that of general plastic, it is still much lower than other materials such as metal. Therefore, it also has the characteristic of low thermal conductivity.

[0062] The material of the second plate body 360 can also be glass fiber, and the thermal conductivity of glass fiber is generally in the range of 0.031 W / (m·K) to 0.05 W / (m·K).

[0063] The thermal conductivity of the second plate body 360 is controlled within the range of 0.031 W / (m·K) to 1 W / (m·K). The relatively low thermal conductivity of the second plate body 360 makes the heat preservation performance of the box body 300 better.

[0064] In some embodiments, the density of the second plate body 360 is less than that of the first plate body 350.

[0065] For example, the material of the second plate body 360 is plastic, and the density of plastic is generally in the range of 0.8 g / cm3 to 1.4 g / cm3. The material of the first plate body 350 is metal, and the density of metal is generally in the range of 6.9 g / cm3 to 22.6 g / cm3.

[0066] The density of the second plate body 360 being less than that of the first plate body 350 makes the box body 300 lighter in weight and able to meet the requirements of vehicle lightweighting.

[0067] In some embodiments, the first plate body 350 is a metal part and the second plate body 360 is a plastic part.

[0068] A metal part refers to a structural part made of metal, and a plastic part refers to a structural part made of plastic. The thermal conductivity of metals generally ranges from 10 W / (m·K) to 400 W / (m·K), and the thermal conductivity of plastics generally ranges from 0.2 W / (m·K) to 0.46 W / (m·K). It can be seen that the thermal conductivity of plastics is much lower than that of metals. On the other hand, the density of metals generally ranges from 6.9 g / cm3 to 22.6 g / cm3, and the density of plastics generally ranges from 0.8 g / cm3 to 1.4 g / cm3. It can be seen that the density of plastics is also much lower than that of metals.

[0069] The first plate body 350 is a metal part, and the second plate body 360 is a plastic part. By utilizing the characteristic of high thermal conductivity of the metal part, the heat transfer efficiency between the battery cell 400 and the cooling medium in the flow channel 370 can be improved. Moreover, the thermal conductivity of the plastic part is much lower than that of the metal part, which can improve the heat preservation performance of the box body 300. In addition, the low density of the plastic part makes the weight of the box body 300 lighter, meeting the requirements of vehicle lightweight. Additionally, the plastic part has good corrosion resistance, making the service life of the box body 300 longer.

[0070] In some embodiments, the material of the first plate body 350 is an iron-based material or an aluminum-based material. The material of the second plate body 360 is polyphenylene sulfide (abbreviation "PPS") or polyphthalamide (abbreviation "PPA").

[0071] Iron-based materials are a type of steel material mainly composed of iron elements, with alloy elements such as carbon, copper, and nickel added. The thermal conductivity of iron-based materials generally ranges from 80 W / (m·K) to 120 W / (m·K). Aluminum-based materials refer to aluminum alloy materials based on aluminum elements. The thermal conductivity of aluminum-based materials generally ranges from 200 W / (m·K) to 250 W / (m·K). It can be seen that both iron-based materials and aluminum-based materials have relatively high thermal conductivities, which can ensure the heat transfer efficiency between the battery cell 400 and the cooling medium in the flow channel 370. Polyphenylene sulfide and polyphthalamide are both special engineering plastics with excellent comprehensive properties. The thermal conductivities of polyphenylene sulfide and polyphthalamide generally range from 0.2 W / (m·K) to 0.46 W / (m·K), with relatively low thermal conductivities, and at the same time, they have excellent chemical corrosion resistance, mechanical strength, and high-temperature resistance.

[0072] In some embodiments, when the first plate body 350 is a metal part and the second plate body 360 is a plastic part, the first plate body 350 and the second plate body 360 can be thermally pressed and connected to seal the flow channel 370 between the first plate body 350 and the second plate body 360.

[0073] The second plate body 360 is connected to the first plate body 350 through a hot pressing process. A hot pressing melting layer is formed on the side of the second plate body 360 facing the first plate body 350 after heating, and adheres to the surface of the first plate body 350. The hot pressing process can not only connect the second plate body 360 and the first plate body 350, but also seal the connection interface between the two, thereby realizing the sealing of the flow channel 370, and the manufacturing process is simple and reliable.

[0074] The thickness of the hot pressing melting layer can be 0.1 mm to 2 mm. Among them, the thickness direction of the hot pressing melting layer is the same as the thickness direction of the second plate body 360. Exemplarily, the thickness of the hot pressing melting layer can be 0.1 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm or 2 mm, etc. By controlling the thickness of the hot pressing melting layer within this range, while reducing the hot pressing deformation amount of the second plate body 360 and ensuring the dimensional accuracy, the second plate body 360 and the first plate body 350 can have sufficient connection strength, and the risk of heat exchange medium leakage caused by interface peeling can be reduced.

[0075] In some embodiments, the thickness of the hot pressing melting layer can be 0.5 mm to 1 mm.

[0076] Figure 9 is a schematic structural diagram of the second plate body 360 disclosed in an embodiment of the present application. Combining Figure 8 and Figure 9 as shown, the second plate body 360 can be recessed in a direction away from the first plate body 350 to form a groove 351. The first plate body 350 is a flat plate structure, and a part of the first plate body 350 covers the groove 351 to form a flow channel 370.

[0077] The second plate body 360 can be a plate-like structure. A groove 351 is recessed on the surface of the second plate body 360 facing the first plate body 350. The groove 351 can be arranged in an S-shaped bent shape along the surface of the second plate body 360 to increase the area of the groove 351. The groove 351 has an opening facing the first plate body 350, and the first plate body 350 covers the opening of the groove 351 to form a flow channel 370.

[0078] The first plate body 350 is a flat plate structure, that is, the surface of the first plate body 350 facing the second plate body 360 can be a plane, which can cover the opening of the groove 351. The cross-section of the groove 351 can be rectangular, trapezoidal, semi-circular, etc. In this embodiment of the present application, the cross-section of the groove 351 is taken as an example of a rectangle for description.

[0079] In the above embodiments, only the groove 351 needs to be formed on the second plate body 360. The first plate body 350 has a flat plate structure and there is no need to process a groove on the first plate body 350, so the manufacturing process is simpler. Moreover, when the first plate body 350 is a metal part and the second plate body 360 is a plastic part, taking advantage of the easy forming property of the plastic part, by forming the groove 351 on the plastic part and then covering the first plate body 350 on the groove 351 to form the flow channel 370, the manufacturing process is simpler. In addition, the metal part mainly serves to cover the groove 351, has a small contact area with the heat exchange medium in the flow channel 370, can reduce the risk of corrosion, and thus improve the service life of the box body 300.

[0080] In some embodiments, the thickness H of the second plate body 360 may be 5 mm - 8 mm.

[0081] Wherein, the thickness of the second plate body 360 refers to the thickness at other positions of the second plate body 360 except for the groove 351. The thickness direction of the second plate body 360 is consistent with the arrangement direction of the second plate body 360, the first plate body 350, and the battery cell 400. Exemplarily, the thickness of the second plate body 360 may be 5 mm, 5.5 mm, 6 mm, 7 mm, 7.6 mm, or 8 mm, etc.

[0082] In some embodiments, the depth H1 of the groove 351 may be 2 mm - 4 mm. Wherein, the depth direction of the groove 351 is consistent with the thickness direction of the second plate body 360. Exemplarily, the depth H1 of the groove 351 may be 2 mm, 2.3 mm, 2.7 mm, 3 mm, 3.5 mm, or 4 mm, etc.

[0083] By controlling the depth H1 of the groove 351 within the range of 2 mm - 4 mm, the flow resistance of the groove 351 is small and the space occupied in the thickness direction of the box body 300 is small. In addition, there is a certain height difference between the surface of the second plate body 360 and the bottom of the groove 351, which further makes the injection mold for forming the second plate body 360 have a certain height difference, thereby reducing the forming difficulty of the second plate body 360.

[0084] In some embodiments, the depth H1 of the groove 351 may also be 3 mm - 3.5 mm.

[0085] In some embodiments, the thickness H2 of the second plate body 360 at the position corresponding to the groove 351 may be 3 mm to 4 mm. Among them, the thickness direction of the second plate body 360 at the position of the groove 351 is consistent with the thickness direction of the second plate body 360, and the thickness of the second plate body 360 at the position corresponding to the groove 351 refers to the distance from the bottom surface of the groove 351 to the surface of the second plate body 360 facing away from the first plate body 350. Exemplarily, the thickness H2 of the second plate body 360 at the position of the groove 351 may be 3 mm, 3.2 mm, 3.5 mm, 3.8 mm or 4 mm, etc.

[0086] Controlling the thickness H2 of the second plate body 360 at the position of the groove 351 within the above range can make the second plate body 360 have high bearing strength and have a good heat preservation effect on the box body 300 while occupying a small space in the thickness direction of the box body 300.

[0087] In some embodiments, the width W1 of the groove 351 may be 15 mm to 40 mm. Among them, the width direction of the groove 351 is perpendicular to the thickness direction of the second plate body 360. Exemplarily, the width W1 of the groove 351 may be 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 38 mm or 40 mm, etc.

[0088] Controlling the width W1 of the groove 351 within the above range makes the flow resistance of the groove 351 small and ensures the bearing strength of the second plate body 360, reducing the problems of poor bearing strength of the second plate body 360 caused by too wide a width of the groove 351 and a small number of flow channels 370 arranged in the width direction of the groove 351.

[0089] In some embodiments, the width W1 of the groove 351 may also be 20 mm to 25 mm.

[0090] In some embodiments, the width W2 between two adjacent grooves 351 is controlled within the range of 15 mm to 40 mm.

[0091] Among them, the width direction between two adjacent grooves 351 is perpendicular to the thickness direction of the second plate body 360, and the width between two adjacent grooves 351 refers to the distance between two adjacent groove side walls of two adjacent grooves 351. Exemplarily, the width W2 between two adjacent grooves 351 may be 15 mm, 20 mm, 25 mm, 30 mm, 35 mm or 40 mm, etc.

[0092] Controlling the width W2 between two adjacent grooves 351 within the above range can, on the premise of ensuring a sufficient area of the flow channels 370, make the second plate body 360 and the first plate body 350 have a certain connection area, ensure the connection strength, and thus reduce the risk of heat exchange medium leakage.

[0093] In some embodiments, the width W2 between two adjacent grooves 351 may be 15 mm to 25 mm.

[0094] Combined Figure 5 and Figure 9 As shown, in some embodiments, the second plate body 360 is provided with an inlet 361 and an outlet 362. The inlet 361 and the outlet 362 respectively penetrate through the second plate body 360 along the thickness direction of the second plate body 360 and are connected to the flow channel 370.

[0095] The orthographic projections of the inlet 361 and the outlet 362 along the thickness direction of the second plate body 360 fall within the range of the groove 351. After the inlet 361 and the outlet 362 penetrate through the second plate body 360, they are connected to the flow channel 370. The inlet 361 and the outlet 362 can be respectively connected to both ends of the flow channel 370. The inlet 361 is used to introduce a heat exchange medium into the flow channel 370, and the outlet 362 is used to discharge the heat exchange medium in the flow channel 370. The cross-sections of the inlet 361 and the outlet 362 can be circular, elliptical or polygonal, etc.

[0096] The inlet 361 and the outlet 362 are located outside the box body 300, so as to be away from the battery cells 400 inside the box body 300, reducing the influence on the battery cells 400 after the heat exchange medium leaks from the inlet 361 and the outlet 362. And when the second plate body 360 is a plastic part, the inlet 361 and the outlet 362 can be formed on the second plate body 360 by an integral injection molding process, and the manufacturing process is simple.

[0097] In some embodiments, the box body 300 further includes a first pipe body 380 and a second pipe body 390. The first pipe body 380 and the second pipe body 390 are integrally formed with the second plate body 360, and the first pipe body 380 is connected to the inlet 361, and the second pipe body 390 is connected to the outlet 362.

[0098] The first pipe body 380 is used to connect the liquid inlet system of the battery 100 and the inlet 361, and the second pipe body 390 is used to connect the liquid outlet system of the battery and the outlet 362. The cross-sectional shape of the first pipe body 380 can be the same as the cross-sectional shape of the inlet 361, and the cross-sectional shape of the second pipe body 390 can be the same as the cross-sectional shape of the outlet 362. The integral formation of the first pipe body 380, the second pipe body 390 and the second plate body 360 means that the first pipe body 380, the second pipe body 390 and the second plate body 360 are processed into an integral component by a one-time forming method, such as an injection molding process, an insert injection molding process, etc.

[0099] The first pipe body 380 and the second pipe body 390 can facilitate the introduction and export of the heat exchange medium in the flow channel 370. The first pipe body 380, the second pipe body 390 and the second plate body 360 are integrally formed, with a simple manufacturing process, and the first pipe body 380, the second pipe body 390 and the second plate body 360 are tightly connected, which can greatly reduce the risk of heat exchange medium leakage.

[0100] Combined Figure 5 with Figure 8 As shown, in some embodiments, the box body 300 further includes a sealant layer 352. The sealant layer 352 is disposed between the second plate body 360 and the first plate body 350 and is bonded to the second plate body 360 and the first plate body 350 to seal the flow channel 370.

[0101] The material of the sealant layer 352 can be a sealing material with a certain adhesiveness. The sealant layer 352 can be coated on the surface of the second plate body 360 facing the first plate body 350. The sealant layer 352 can not only connect the second plate body 360 and the first plate body 350, but also seal the connection interface between the two, with the functions of leak prevention and waterproofing, thereby realizing the sealing of the flow channel 370.

[0102] In some embodiments, the thickness of the sealant layer 352 is 0.5 mm to 1.5 mm.

[0103] Among them, the thickness direction of the sealant layer 352 is the same as the thickness direction of the second plate body 360. Exemplarily, the thickness of the sealant layer 352 can be 0.5 mm, 0.8 mm, 1 mm, 1.3 mm or 1.5 mm, etc.

[0104] Controlling the thickness of the sealant layer 352 within this range can, while saving the amount of the sealant layer 352, enable the second plate body 360 and the first plate body 350 to have sufficient connection strength and reduce the risk of heat exchange medium leakage caused by interface peeling.

[0105] In some embodiments, the thickness of the sealant layer 352 can be 0.8 mm to 1.2 mm.

[0106] In some embodiments, the first part 310 and / or the second part 320 includes the first plate body 350 and the second plate body 360. For example, the first part 310 includes the first plate body 350 and the second plate body 360, so as to form the flow channel 370 on the first part 310. Or, the second part 320 includes the first plate body 350 and the second plate body 360, so as to form the flow channel 370 on the second part 320. Or, the first part 310 includes the first plate body 350 and the second plate body 360, and the second part 320 includes the first plate body 350 and the second plate body 360, so that the flow channels 370 are respectively formed on the first part 310 and the second part 320, which can greatly improve the heat exchange efficiency of the battery.

[0107] By forming a flow channel 370 on the first part 310 and / or the second part 320, the box body 300 serves as a battery shell and integrates heat exchange and insulation functions. It has a high degree of integration and can meet the lightweight requirements of the entire vehicle.

[0108] The embodiment of the present application further provides an electrical device, comprising the battery 100 of the above embodiment, and the battery 100 is used to provide electrical energy.

[0109] Please refer to Figure 5 , Figure 8 and Figure 9 The embodiment of the present application provides a battery 100, which includes a box body 300 and a battery cell 400. The box body 300 includes a first part 310 and a second part 320. The first part 310 and the second part 320 cover each other to form a receiving space 330, and the battery cell 400 is arranged in the receiving space 330. The first part 310 includes a first plate body 350 and a second plate body 360. The first plate body 350 is a metal part made of a metal material such as an iron-based or aluminum-based material, and the second plate body 360 is a plastic part made of a plastic such as polyphenylene sulfide or polyphthalamide. The battery cell 400 is fixed to the first plate body 350 by structural adhesive bonding, and the second plate body 360 is stacked on the side of the first plate body 350 away from the battery cell 400. The second plate body 360 is connected to the first plate body 350 through a sealant layer 352, or is hot-pressed to the first plate body 350. The surface of the second plate 360 ​​facing the first plate 350 is recessed in a direction away from the first surface to form a groove 351, and a portion of the first plate 350 is covered in the groove 351 to form a flow channel 370. The second plate 360 ​​is also provided with an inlet 361 and an outlet 362, and the inlet 361 and the outlet 362 respectively penetrate the second plate 360 ​​along the thickness direction of the second plate 360 ​​and are connected to the flow. The box body 300 also includes a first tube body 380 and a second tube body 390, and the first tube body 380, the second tube body 390 and the second plate 360 ​​are integrally formed, and the first tube body 380 circulates through the inlet 361 and the flow channel 370, and the second tube body 390 is connected to the flow channel 370 through the outlet 362.

[0110] In the above battery, a flow channel 370 is defined between the first plate 350 and the second plate 360, and heat exchange is achieved between the first plate 350 with high thermal conductivity and the battery cell 400, thereby ensuring the heat exchange efficiency between the battery cell 400 and the heat exchange medium in the flow channel 370. The second plate 360 ​​is arranged on the side of the first plate 350 away from the battery cell 400. The low thermal conductivity of the second plate 360 ​​can improve the thermal insulation performance of the box 300, thereby realizing the integration of heat exchange function and thermal insulation function on the box 300, with a high degree of integration and low density of plastic parts, so that the weight of the box 300 is lighter, meeting the requirements of lightweight vehicle. At the same time, the plastic parts have good corrosion resistance, which makes the service life of the box 300 longer. Furthermore, the first plate 350 and the second plate 360 ​​are connected by a sealant layer 352 or hot pressing, and the flow channel 370 is sealed at the same time, reducing the risk of leakage of the heat exchange medium.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: Battery cells; as well as A box body, in which the battery cells are accommodated; The box body includes a first plate body and a second plate body, the first plate body is thermally connected to the battery monomer, the second plate body is stacked on a side of the first plate body away from the battery monomer, and is interconnected with the first plate body, a flow channel is formed between the first plate body and the second plate body, and the flow channel is used to accommodate a heat exchange medium to perform heat exchange with the battery monomer; Wherein, the thermal conductivity of the second plate is smaller than the thermal conductivity of the first plate.

2. The battery according to claim 1, characterized in that The thermal conductivity of the second plate is 0.031 W / (m·K) to 1 W / (m·K).

3. The battery according to claim 1, characterized in that The density of the second plate body is lower than the density of the first plate body.

4. The battery according to any one of claims 1 to 3, characterized in that: The first plate body is a metal part, and the second plate body is a plastic part.

5. The battery according to claim 4, characterized in that The material of the first plate body is an iron-based material or an aluminum-based material, and the material of the second plate body is polyphenylene sulfide or polyphthalamide.

6. The battery according to claim 4, characterized in that The first plate body and the second plate body are connected by heat pressing to seal the flow channel.

7. The battery according to claim 1, characterized in that The second plate body is sunken in a direction away from the first plate body to form a groove. The first plate body is a flat plate structure. Part of the first plate body covers the groove to form the flow channel.

8. The battery according to claim 7, characterized in that The depth of the groove is 2 mm to 4 mm.

9. The battery according to claim 7, characterized in that The thickness of the second plate body corresponding to the groove is 3 mm to 4 mm.

10. The battery according to claim 1, characterized in that The second plate body is provided with an inlet and an outlet, and the inlet and the outlet respectively penetrate the second plate body along the thickness direction of the second plate body and are communicated with the flow channel.

11. The battery according to claim 10, characterized in that The box body further includes a first tube body and a second tube body, wherein the first tube body, the second tube body and the second plate body are integrally formed, and the first tube body is communicated with the inlet, and the second tube body is communicated with the outlet.

12. The battery according to claim 1, characterized in that The box body further includes a sealant layer, which is disposed between the first plate body and the second plate body and is bonded to the first plate body and the second plate body to seal the flow channel.

13. The battery according to claim 12, characterized in that The thickness of the sealant layer is 0.5 mm to 1.5 mm.

14. The battery according to claim 1, characterized in that The box body includes a first part and a second part. The first part and the second part cover each other to form a receiving space. The battery cell is received in the receiving space. The first part and / or the second part includes the first plate body and the second plate body.

15. An electrical device, characterized in that: The invention comprises a battery as claimed in any one of claims 1 to 14, wherein the battery is used to provide electrical energy.

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