Battery box and automobile

Abstract

The invention relates to the technical field of new energy automobiles, in particular to a battery box and an automobile. The battery box body comprises a box body and a battery module; the thermal resistance of the battery module in the length direction is # imgabs 0 #, the thermal resistance of the battery module in the width direction is # imgabs 1 #, the thermal resistance of the battery module in the height direction is # imgabs 2 #, and the thermal resistance of the battery module in the length direction is # imgabs 3 #, the thermal resistance of the battery module in the width direction is # imgabs 4 #, and the thermal resistance of the battery module in the length direction is # imgabs 5 #, # imgabs 6 # and # imgabs 7 #. And the temperature difference problem of the battery monomers in the battery module is not considered.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a battery box and a vehicle. Background Art

[0002] An existing battery case generally includes an upper case, a lower case and a frame, and the upper case, the lower case and the frame are connected by welding or a complex mechanical method to accommodate a battery module.

[0003] In the existing thermal insulation technology for battery boxes, thermal insulation materials are usually evenly covered on the inner surface of the box, which can have a certain thermal insulation effect on power batteries. However, because the thermal conductivity of battery cells is anisotropic, the temperature difference of battery cells inside the battery module will be too large. In the existing thermal insulation technology for battery boxes, the temperature difference of battery cells inside the battery module is not considered. The battery module has high requirements for temperature uniformity between battery cells, and the temperature difference of the battery cells themselves will also affect the charging and discharging performance, safety of use and cycle life of the battery module. Summary of the invention

[0004] The purpose of the present application is to provide a battery box and a car, thereby solving the problem that the temperature difference of the battery cells inside the battery module is not considered in the existing thermal insulation technology of the battery box.

[0005] According to a first aspect of the present application, a battery box is provided, the battery box comprising a box body and a battery module arranged inside the box body, the battery module having a length direction, a width direction and a height direction which are perpendicular to each other; the box body is provided with a first insulation layer on both sides opposite to each other in the length direction, the box body is provided with a second insulation layer on both sides opposite to each other in the width direction, and the box body is provided with a third insulation layer on both sides opposite to each other in the height direction;

[0006] Thermal resistance of the battery module in the length direction Thermal resistance of the battery module in the width direction Thermal resistance of the battery module in the height direction Among them, λ x1 is the thermal conductivity of the battery module in the length direction, λ y1 is the thermal conductivity of the battery module in the width direction, λ z1 is the thermal conductivity of the battery module in the height direction, X D is the length dimension of the battery module, Y D is the width dimension of the battery module, Z D is the height dimension of the battery module, μ is the thermal resistance gain coefficient;

[0007] The thermal resistance of the box body in the length direction The thermal resistance of the box body in the width direction The thermal resistance of the box body in the height direction Among them, λ b is the thermal conductivity of the insulation material, t x is the thickness of the first insulation layer, t y is the thickness of the second insulation layer, t z is the thickness of the third insulation layer, X X Y is the length of the box body. X is the size of the box body in the width direction, Z X is the size of the box body in the height direction;

[0008] in this way,

[0009]

[0010] In any of the above technical schemes, further, the box body includes an upper box body, a lower box body and a frame; a first threaded hole is provided at the top of the frame, and the upper box body is provided with a first threaded mounting hole corresponding to the first threaded hole; a second threaded hole is provided at the bottom of the frame, and the lower box body is provided with a second threaded mounting hole corresponding to the second threaded hole; the first thermal insulation layer is provided on both sides of the frame opposite to each other in the length direction, the second thermal insulation layer is provided on both sides of the frame opposite to each other in the width direction, and the upper box body and the lower box body are both provided with the third thermal insulation layer.

[0011] In any of the above technical solutions, further, the thickness of the first thermal insulation layer is 3 mm, the thickness of the second thermal insulation layer is 4 mm, and the thickness of the third thermal insulation layer is 5 mm.

[0012] In any of the above technical solutions, further, a third flame retardant layer is arranged on the outer side of the upper box body, the third thermal insulation layer is arranged on the outer side of the third flame retardant layer, and a third waterproof layer is arranged on the outer side of the third thermal insulation layer.

[0013] In any of the above technical solutions, further, the frame includes two wide walls opposite to each other in the length direction and two long walls opposite to each other in the width direction; the first thermal insulation layer is arranged on the inner side of the two wide walls, and the first flame retardant layer is arranged on the inner side of the first thermal insulation layer; the second thermal insulation layer is arranged on the inner side of the two long walls, and the second flame retardant layer is arranged on the inner side of the second thermal insulation layer.

[0014] In any of the above technical solutions, further, the lower box body includes a liquid cooling plate, and the liquid cooling plate can fit the battery module; the liquid cooling plate is provided with a second threaded mounting hole corresponding to the second threaded hole; the third thermal insulation layer is provided on the outer side of the liquid cooling plate, and the third waterproof layer is provided on the outer side of the third thermal insulation layer.

[0015] In any of the above technical solutions, further, the battery box also includes multiple adapters and multiple support beams; the multiple adapters are divided into two groups, and the two groups of adapters are respectively connected to the inner sides of the two long walls; the multiple adapters of one group correspond one to one with the multiple adapters of the other group; the two ends of the support beam are respectively connected to the two corresponding adapters by bolts, and the multiple support beams can carry the battery module.

[0016] In any of the above technical solutions, further, a heat-insulating bolt gasket is provided between the adapter and the support beam. Waterproof sealant is applied to the joint between the upper box and the frame and to the joint between the lower box and the frame.

[0017] In any of the above technical solutions, further, the first thermal insulation layer, the second thermal insulation layer and the third thermal insulation layer are all made of polyurethane foam; the third waterproof layer is a film made of polyurea; the first flame retardant layer, the second flame retardant layer and the third flame retardant layer are all films made of PC material or ABS material.

[0018] According to a second aspect of the present application, a car is provided, comprising the battery box as described above.

[0019] Thermal resistance of the battery module of the present application in the length direction Thermal resistance of the battery module in the width direction Thermal resistance of the battery module in the height direction Thermal resistance of the box body in the length direction Thermal resistance of the box body in the width direction Thermal resistance of the box body in the height direction

[0020]

[0021] The heat transfer process of the battery box in a certain direction can be approximated as the heat transfer of the multi-layer flat wall of the insulation layer + battery module. If the temperature gradient in each direction is to be the same, the thermal resistance of the battery box in each direction needs to be balanced, that is, the thermal resistance of the battery box in the X, Y, and Z directions is equal. Based on this,

[0022] Where t x ,t y ,t zExcept for the unknown, the rest are known, so the required thermal resistance can be determined according to the actual insulation requirements of the battery box, and then the thickness of the insulation layer in each direction t can be determined. x ,t y ,t z , complete the insulation layer design.

[0023] According to the above technical features:

[0024] The present application designs insulation layers for the six surfaces of the box body based on the balance of isotropic thermal resistance, and matches insulation layers of different thicknesses to different positions of the box body, so as to balance the isotropic thermal resistance of the battery box, make the temperature gradient trend of the battery module in the X, Y, and Z directions consistent, dissipate heat evenly in all directions, make the temperature of each surface of the battery cell tend to be consistent, improve the temperature uniformity of the battery, and thus improve the battery performance.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram showing the overall structure of a battery box according to an embodiment of the present application is shown;

[0028] Figure 2 Show Figure 1 A magnified schematic diagram of part B;

[0029] Figure 3 A schematic diagram showing the coating of the upper box according to an embodiment of the present application is shown;

[0030] Figure 4 A schematic diagram showing the coating of the lower box according to an embodiment of the present application is shown;

[0031] Figure 5 A schematic diagram showing a coating of a wide wall according to an embodiment of the present application;

[0032] Figure 6 A schematic diagram showing coating of a long wall according to an embodiment of the present application is shown.

[0033] Icon: 1-upper box; 2-frame; 21-wide wall; 22-long wall; 211-first flame retardant layer; 212-first thermal insulation layer; 221-second flame retardant layer; 222-second thermal insulation layer; 3-lower box; 31-liquid cooling plate; 11-third waterproof layer; 12-third thermal insulation layer; 13-third flame retardant layer; 24-adapter; 25-support beam; 26-insulation bolt gasket; X-length direction; Y-width direction; Z-height direction. DETAILED DESCRIPTION

[0034] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0035] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0036] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0037] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0038] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0039] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0040] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0041] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0042] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0043] A first aspect of the present application provides a battery case, thereby solving the problem that the existing thermal insulation technology for battery cases does not take into account the temperature difference of battery cells inside a battery module.

[0044] Refer to the following Figures 1 to 6 The battery case according to some embodiments of the present application is described in detail.

[0045] In the embodiment of the present application, the battery box includes a box body and a battery module ( Figure 1 The battery module is not shown in the figure, and the battery module is designed to be similar to the box body. Figure 1 As shown, the battery module has a length direction X, a width direction Y and a height direction Z that are perpendicular to each other. Among them, the box body is provided with a first insulation layer on both sides opposite to each other in the length direction X, the box body is provided with a second insulation layer on both sides opposite to each other in the width direction Y, and the box body is provided with a third insulation layer on both sides opposite to each other in the height direction Z.

[0046] The present application can design an insulation layer for the battery case. The insulation layer design can be optimized according to the actual insulation capacity requirements, and the thickness of the insulation layer required in each direction of the battery case can be confirmed to balance the thermal resistance of the battery case in all directions, improve the temperature uniformity of the battery, and thus improve the battery performance.

[0047] The specific design is as follows:

[0048] First, through experiments or simulations, clarify the physical quantities needed in the calculation process. For example, the length, width and height of the battery module; the length, width and height of the box body; the thermal conductivity of the insulation material used;

[0049] After that, calculate the thermal resistance in each direction. The calculation formula of thermal resistance is:

[0050] Where R is the thermal resistance, L is the thickness through the material, λ is the thermal conductivity of the material, and A is the cross-sectional area of ​​the insulation material in a specific direction.

[0051] It can be obtained that the thermal resistance of the battery module of the present application in the length direction is Thermal resistance of the battery module in the width direction Thermal resistance of the battery module in the height direction

[0052] Among them, λ x1 is the thermal conductivity of the battery module in the length direction X, λ y1 is the thermal conductivity of the battery module in the width direction Y, λ z1 is the thermal conductivity of the battery module in the height direction Z, X D is the size of the battery module in the length direction X, Y D is the size of the battery module in the width direction Y, Z D is the size of the battery module in the height direction Z, and μ is the thermal resistance gain coefficient.

[0053] It can be obtained that the thermal resistance of the box body of the present application in the length direction X is Thermal resistance of the box body in the width direction Y Thermal resistance of the box body in the height direction Z

[0054]

[0055] Among them, λ b is the thermal conductivity of the insulation material, t x is the thickness of the first insulation layer 212, t y is the thickness of the second insulation layer 222, t z is the thickness of the third insulation layer 12, X X is the size of the box body in the length direction X, Y X is the size of the box body in the width direction Y, Z X It is the dimension of the box body in the height direction Z.

[0056] The total thermal resistance calculation formula for multi-layer flat wall heat transfer is:

[0057] The heat transfer process of the battery box in a certain direction can be approximated as the multi-layer flat wall heat transfer of the insulation layer + battery module. The thermal resistance of the insulation battery box in the X, Y, and Z directions are:

[0058]

[0059] If the temperature gradient in each direction is to be the same, the thermal resistance of the battery box in each direction needs to be balanced, that is, the thermal resistance of the battery box in the X, Y, and Z directions is equal. Based on this, we have:

[0060] Where t x ,t y ,t z Except for the unknown, the rest are known, so the required thermal resistance can be determined according to the actual insulation requirements of the battery box, and then the thickness of the insulation layer in each direction t can be determined. x ,t y ,t z , complete the insulation layer design.

[0061] μ is the thermal resistance gain coefficient, and its value range is between 0 and 2. The thermal resistance gain coefficient is determined according to the actual arrangement of the battery modules in the box, such as the value of the thermal resistance gain coefficient μ given by the battery cell gap, the number of battery modules, the gap, and other structural parts. The value of μ can be the value obtained by technicians in this field based on experience.

[0062] To summarize the above design, this application designs insulation layers for the six surfaces of the box body based on the balance of isotropic thermal resistance, and matches insulation layers of different thicknesses to different positions of the box body to balance the isotropic thermal resistance of the battery box, make the temperature gradient trend of the battery module in the X, Y, and Z directions consistent, dissipate heat evenly in all directions, make the temperature of each surface of the battery cell tend to be consistent, improve the temperature uniformity of the battery, and thus improve the battery performance.

[0063] In the embodiments of the present application, Figure 1 As shown, the box body includes an upper box body 1, a lower box body 3 and a frame 2; the frame 2 is provided with a first insulation layer on both sides opposite to each other in the length direction X, the frame 2 is provided with a second insulation layer on both sides opposite to each other in the width direction Y, and the upper box body 1 and the lower box body 3 are both provided with a third insulation layer.

[0064] Specifically, the frame 2 includes two wide walls 21 opposite to each other in the length direction X and two long walls 22 opposite to each other in the width direction Y; the two wide walls 21 are both provided with a first insulation layer, and the two long walls 22 are both provided with a second insulation layer.

[0065] Preferably, the thickness of the first insulation layer 212 is 3 mm, the thickness of the second insulation layer 222 is 4 mm, and the thickness of the third insulation layer 12 is 5 mm. This is conducive to better reducing the temperature difference of the single cells inside the battery module, ensuring the temperature uniformity of the module, and thus improving the battery performance and life.

[0066] The coating structures of the upper box body 1 , the lower box body 3 and the frame 2 will be described in detail below.

[0067] In the embodiments of the present application, Figure 3 As shown, the outer side of the upper box body 1 is provided with a third flame retardant layer 13, the outer side of the third flame retardant layer 13 is provided with the third thermal insulation layer 12, and the outer side of the third thermal insulation layer 12 is provided with a third waterproof layer 11. That is, the coating on the outer side of the upper box body 1 is composed of a third waterproof layer 11, a third thermal insulation layer 12, and a third flame retardant layer 13 to form a sandwich structure. The third thermal insulation layer 12 has two bonding surfaces, one side is pasted with the third waterproof layer 11, and the other side is pasted with the third flame retardant layer 13, and from the inside to the outside, they are the third flame retardant layer 13, the third thermal insulation layer 12, and the third waterproof layer 11. As shown in 3, the third waterproof layer 11 plays a role in preventing liquid from entering the battery box body, the third thermal insulation layer 12 is used to keep the battery module warm and improve the temperature uniformity of the battery module, and the third flame retardant layer 13 plays a role in preventing the fire from spreading after the fire breaks out inside the battery box body. In this embodiment, the third thermal insulation layer 12, the third waterproof layer 11 and the third flame retardant layer 13 are bonded by modified glue.

[0068] In the embodiments of the present application, Figure 1As shown, the frame 2 is a metal frame (made of aluminum alloy using a stamping integration process), and the frame 2 includes two wide walls 21 opposite to each other in the length direction X and two long walls 22 opposite to each other in the width direction Y.

[0069] like Figure 5 As shown, a first thermal insulation layer 212 is provided on the inner side of the two wide walls 21, and a first flame retardant layer 211 is provided on the inner side of the first thermal insulation layer 212; the first thermal insulation layer 212 has two bonding surfaces, the first thermal insulation layer 212 and the wide wall 21 are bonded and adhered by glue, and the first thermal insulation layer 212 and the first flame retardant layer 211 are bonded by modified glue.

[0070] like Figure 6 As shown, a second thermal insulation layer 222 is provided on the inner side of the two long walls 22, and a second flame retardant layer 221 is provided on the inner side of the second thermal insulation layer 222; the second thermal insulation layer 222 has two bonding surfaces, the second thermal insulation layer 222 and the long wall 22 are bonded and adhered by glue, and the second thermal insulation layer 222 and the second flame retardant layer 221 are bonded by modified glue.

[0071] In the embodiments of the present application, Figure 1 and Figure 2 As shown, the battery box also includes a plurality of adapters 24 and a plurality of support beams 25; the plurality of adapters 24 are divided into two groups, and the two groups of adapters 24 are respectively welded on the inner side of the two long walls 22 (avoiding the insulation layer and the flame retardant layer). The plurality of adapters 24 in one group correspond to the plurality of adapters 24 in the other group one by one; the two ends of the support beam 25 are respectively connected to the two corresponding adapters 24 by bolts, and the plurality of support beams 25 can carry the battery module.

[0072] Furthermore, if Figure 2 As shown, a heat-insulating bolt gasket 26 is provided between the adapter 24 and the support beam 25. In this way, there is a heat-insulating bolt gasket 26 at the junction of the two, which plays a role in blocking the support beam 25 from conducting the heat of the battery module to the frame 2 (metal frame), and plays a role in heat preservation and heat insulation. The bolt passes through the adapter 24, the heat-insulating bolt gasket 26 and the support beam 25 from top to bottom, and threads are processed in the support beam 25 for connection with the bolt.

[0073] In the embodiment of the present application, the lower box 3 includes a liquid cooling plate 31, and the liquid cooling plate 31 can fit the battery module. Here, for example, the liquid cooling plate 31 is designed to conform to the shape, avoiding the plurality of support beams 25, so as to contact and fit with the bottom surface of the battery module.

[0074] like Figure 4As shown, a third thermal insulation layer 12 is disposed on the outer side of the liquid cooling plate 31, and a third waterproof layer 11 is disposed on the outer side of the third thermal insulation layer 12. Here, 60°C water is passed through the liquid cooling plate 31, and pressurized to 250±5T, the curing temperature is 160±5°C, and the curing time is 910min, and the third thermal insulation layer 12 is connected together by heating and pressurizing curing. The third thermal insulation layer 12 and the third waterproof layer 11 are bonded by modified glue.

[0075] In the embodiment of the present application, the first insulation layer 212, the second insulation layer 222 and the third insulation layer 12 can be made of polyurethane foam with good insulation performance, with a density of 70kg / m 3 , the thermal conductivity is 0.025W / (m·K). The third waterproof layer 11 can be a film made of polyurea. The first flame retardant layer 211, the second flame retardant layer 221 and the third flame retardant layer 13 can all be films made of PC material or ABS material.

[0076] In this embodiment, the third insulation layer 12 of the liquid cooling plate 31 is arranged on the outside of the liquid cooling plate 31, and the third insulation layer 12 of the upper box 1 is arranged on the outside of the upper box 1. The insulation layer is designed in this way to increase the space inside the battery box for installing the battery module, which can further improve the battery energy density; secondly, when the battery box is installed in the car, the insulation layer on the outside can play a role in shock absorption and noise reduction.

[0077] It is also worth mentioning that the existing battery module box structure is usually composed of an upper cover and a lower box, both of which are made of steel or aluminum made of metal stampings or extruded structures, and are connected by welding or mechanical means. Although this battery module box can meet safety requirements such as expansion force or random vibration, its overall structure is too heavy, which limits the energy density of the battery module and the driving range of the vehicle. In addition, the upper cover and lower box structure not only increase the complexity of manufacturing, but also the battery cells may age or be damaged during use, requiring repair or replacement. The overall molded structure is difficult to repair and the replacement cost is high.

[0078] In the embodiments of the present application, Figure 1 As shown, the box body includes an upper box body 1, a lower box body 3 and a frame 2. The upper box body 1 is connected to the frame 2 by bolts, and threads are processed at the four corners of the upper part of the frame 2. The bolts pass through the upper box body 1 and are connected to the frame 2. At the same time, waterproof sealant is applied at the contact point to play a role in waterproofing the box body. The lower box body 3 (liquid cooling plate 31) is connected to the frame 2 by bolts, and threads are processed at the four corners of the lower part of the frame 2. The bolts pass through the lower box body 3 and are connected to the frame 2. At the same time, waterproof sealant is applied at the contact point to play a role in waterproofing the box body.

[0079] Compared with the prior art, in order to optimize the structure of the power battery box, this application adopts a sandwich structure consisting of an upper box 1, a frame 2 and a lower box 3 (the frame 2 is manufactured by an integrated stamping process of an aluminum alloy plate), the upper box 1 is bolted to the frame 2, and the lower box 3 is bolted to the frame 2. This structural design and assembly method effectively reduces welding and assembly processes and improves molding efficiency. The final box structure has excellent strength, rigidity and lightweight effects.

[0080] In addition, the battery box is divided into three parts: upper, middle and lower, making it easier to maintain. Bolts and adhesives are used to connect the parts, making the battery box more solid, safer and more reliable. The frame bears the weight of the battery module through support beams and connectors, which can reduce the weight of the upper and lower boxes and make the entire power battery pack lighter.

[0081] Furthermore, in order to optimize the function of the power battery box, a waterproof layer, a thermal insulation layer, and a flame retardant layer are provided on the outside of the box, which can block liquid, reduce heat loss, and prevent the spread of fire, thereby improving the performance and safety of the power battery.

[0082] Furthermore, for the optimization of the thermal insulation layer of the power battery box, since the thermal conductivity of the battery cell is anisotropic, the temperature gradient trend of the battery module in the X, Y, and Z directions is required to be consistent, and the heat transfer in all directions is uniform. This application designs the insulation layer for the six external surfaces of the battery module based on the isotropic thermal resistance balance, and matches the insulation layer of different thicknesses to different positions of the battery box, so that the temperature of each surface of the battery tends to be consistent, improves the temperature uniformity of the battery, and thus improves the battery performance.

[0083] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A battery box, characterized in that: The battery box comprises a box body and a battery module arranged inside the box body, wherein the battery module has a length direction, a width direction and a height direction which are perpendicular to each other; The box body is provided with a first insulation layer on both sides opposite to each other in the length direction, the box body is provided with a second insulation layer on both sides opposite to each other in the width direction, and the box body is provided with a third insulation layer on both sides opposite to each other in the height direction; Thermal resistance of the battery module in the length direction Thermal resistance of the battery module in the width direction Thermal resistance of the battery module in the height direction Among them, λ x1 is the thermal conductivity of the battery module in the length direction, λ y1 is the thermal conductivity of the battery module in the width direction, λ z1 is the thermal conductivity of the battery module in the height direction, X D is the length dimension of the battery module, Y D is the width dimension of the battery module, Z D is the height dimension of the battery module, μ is the thermal resistance gain coefficient; The thermal resistance of the box body in the length direction The thermal resistance of the box body in the width direction The thermal resistance of the box body in the height direction Among them, λ b is the thermal conductivity of the insulation material, t x is the thickness of the first insulation layer, t y is the thickness of the second insulation layer, t z is the thickness of the third insulation layer, X X Y is the length of the box body. X is the width dimension of the box body, Z X is the size of the box body in the height direction; 2. The battery box according to claim 1, characterized in that: The box body comprises an upper box body, a lower box body and a frame; A first threaded hole is provided on the top of the frame, and a first threaded mounting hole corresponding to the first threaded hole is provided on the upper box body; A second threaded hole is provided at the bottom of the frame, and a second threaded mounting hole corresponding to the second threaded hole is provided at the lower box body; The first thermal insulation layer is disposed on both sides of the frame that are opposite to each other in the length direction, the second thermal insulation layer is disposed on both sides of the frame that are opposite to each other in the width direction, and the third thermal insulation layer is disposed on both the upper box body and the lower box body.

3. The battery box according to claim 2, characterized in that: The thickness of the first thermal insulation layer is 3 mm, the thickness of the second thermal insulation layer is 4 mm, and the thickness of the third thermal insulation layer is 5 mm.

4. The battery box according to claim 2, characterized in that: A third flame retardant layer is arranged on the outer side of the upper box body, the third thermal insulation layer is arranged on the outer side of the third flame retardant layer, and a third waterproof layer is arranged on the outer side of the third thermal insulation layer.

5. The battery box according to claim 4, characterized in that: The frame includes two wide walls opposite to each other in the length direction and two long walls opposite to each other in the width direction; The first heat-insulating layer is disposed on the inner side of the two wide walls, and the first flame-retardant layer is disposed on the inner side of the first heat-insulating layer; The second heat-insulating layer is arranged on the inner side of the two long walls, and the second flame-retardant layer is arranged on the inner side of the second heat-insulating layer.

6. The battery box according to claim 2, characterized in that: The lower box includes a liquid cooling plate, and the liquid cooling plate can fit the battery module; The liquid cooling plate is provided with a second threaded mounting hole corresponding to the second threaded hole; The third thermal insulation layer is arranged on the outer side of the liquid cooling plate, and the third waterproof layer is arranged on the outer side of the third thermal insulation layer.

7. The battery box according to claim 5, characterized in that: The battery box also includes a plurality of adapters and a plurality of support beams; The plurality of adapters are divided into two groups, and the two groups of adapters are respectively connected to the inner sides of the two long walls; The multiple adapters in one group correspond one-to-one to the multiple adapters in the other group; Both ends of the support beam are respectively connected to two corresponding adapters by bolts, and the multiple support beams can carry the battery module.

8. The battery case according to claim 7, characterized in that: A heat-insulating bolt gasket is provided between the adapter and the support beam; Waterproof sealant is applied on the joints between the upper box body and the frame and on the joints between the lower box body and the frame.

9. The battery case according to claim 5, characterized in that: The first thermal insulation layer, the second thermal insulation layer and the third thermal insulation layer are all made of polyurethane foam; the third waterproof layer is a film made of polyurea; the first flame retardant layer, the second flame retardant layer and the third flame retardant layer are all films made of PC material or ABS material.

10. An automobile, characterized in that: Comprising a battery case as claimed in any one of claims 1 to 9.

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