Battery housing and automobile

Abstract

This application relates to the field of new energy vehicle technology, and in particular to a battery box and a vehicle. The battery box includes a box body and a battery module; the thermal resistance of the battery module in the length direction is [value missing], the thermal resistance in the width direction is [value missing], and the thermal resistance in the height direction is [value missing]. The thermal resistance of the box body in the length direction is [value missing], the thermal resistance in the width direction is [value missing], and the thermal resistance in the height direction is [value missing]. This application solves the problem that existing battery box insulation technologies do not consider the temperature difference of the individual battery cells inside the battery module.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle technology, and in particular to a battery box and a vehicle. Background Technology

[0002] Existing battery enclosures typically consist of an upper enclosure, a lower enclosure, and a frame, which are connected by welding or complex mechanical means to house the battery module.

[0003] Existing battery box insulation technologies typically involve uniformly covering the inner surface of the box with insulating material, which provides some insulation for the power battery. However, due to the anisotropic thermal conductivity of individual battery cells, the temperature difference between the cells within the battery module can be excessive. Current battery box insulation technologies do not consider this temperature difference issue. Battery modules require high temperature uniformity between battery cells, and the temperature difference between individual cells also affects the charging and discharging performance, safety, and cycle life of the battery module. Summary of the Invention

[0004] The purpose of this application is to provide a battery box and a car, thereby solving the problem that the existing battery box insulation technology does not take into account the temperature difference of the individual battery cells inside the battery module.

[0005] According to a first aspect of this application, a battery housing is provided, the battery housing including a housing body and a battery module disposed inside the housing body, the battery module having two perpendicular length directions, width directions and height directions; a first heat insulation layer is provided on each of the opposite sides of the housing body in the length direction, a second heat insulation layer is provided on each of the opposite sides of the housing body in the width direction, and a third heat insulation layer is provided on each of the opposite sides of the housing body in the height direction.

[0006] The thermal resistance of the battery module in the length direction The thermal resistance of the battery module in the width direction The thermal resistance of the battery module in the height direction Where, λ x1 Let λ be the thermal conductivity of the battery module along its length. y1 Let λ be the thermal conductivity of the battery module in the width direction. z1 X represents the thermal conductivity of the battery module in the height direction. D Y represents the dimension of the battery module in the length direction. D Z represents the dimension of the battery module in the width direction. D Let μ be the dimension of the battery module in the height direction, and μ be 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 Where, λ b t is the thermal conductivity of the insulation material. x t represents the thickness of the first insulation layer. y t represents the thickness of the second insulation layer. z X represents the thickness of the third insulation layer. X Y is the dimension of the box body in the length direction. X Z represents the width dimension of the box body. X This refers to the dimension of the box body in the height direction;

[0008] in this way,

[0009]

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

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

[0012] In any of the above technical solutions, a third flame-retardant layer is further provided on the outer side of the upper housing, a third heat-insulating layer is provided on the outer side of the third flame-retardant layer, and a third waterproof layer is provided on the outer side of the third heat-insulating layer.

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

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

[0015] In any of the above technical solutions, the battery box further 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 beams are respectively connected to the two corresponding adapters by bolts, and the multiple support beams can support the battery module.

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

[0017] In any of the above technical solutions, the first insulation layer, the second insulation layer and the third 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 this application, an automobile is provided, including a battery housing as described above.

[0019] The thermal resistance of the battery module in the length direction of this application The thermal resistance of the battery module in the width direction The 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 casing in a certain direction can be approximated as heat transfer through multiple layers of flat walls, including the insulation layer and the battery module. To ensure the temperature gradient is the same in all directions, the thermal resistance of the battery casing in all directions needs to be balanced, meaning the thermal resistance of the battery casing in the X, Y, and Z directions must be equal. Based on this, we have...

[0022] In the formula, t x t y t zExcept for the unknown, everything else is known. Therefore, the required thermal resistance can be determined based on the actual insulation requirements of the battery box, and thus the thickness t of the insulation layer in each direction can be determined. x t y t z The insulation layer design was completed.

[0023] Based on the above technical characteristics:

[0024] This application designs insulation layers on the six sides of the battery box body based on the equalization of thermal resistance in all directions. Different thicknesses of insulation layers are matched to different positions of the battery box body to make the thermal resistance of the battery box body equal in all directions, so that the temperature gradient trend of the battery module in the X, Y and Z directions is consistent, the heat dissipation in all directions is uniform, and the temperature of each side of the battery cell tends to be consistent, thereby improving the battery temperature uniformity and thus improving the battery performance.

[0025] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the overall structure of the battery housing according to an embodiment of this application is shown;

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

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

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

[0031] Figure 5 A schematic diagram of a wide-walled coating according to an embodiment of this application is shown;

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

[0033] Icons: 1-Upper box; 2-Border; 21-Wide wall; 22-Long wall; 211-First flame-retardant layer; 212-First insulation layer; 221-Second flame-retardant layer; 222-Second insulation layer; 3-Lower box; 31-Liquid cooling plate; 11-Third waterproof layer; 12-Third insulation layer; 13-Third flame-retardant layer; 24-Adapter; 25-Support beam; 26-Insulation bolt washer; X-Length direction; Y-Width direction; Z-Height direction. Detailed Implementation

[0034] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for 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 construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

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

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

[0038] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0039] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that 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 relation terms used herein will be interpreted accordingly.

[0040] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0041] Variations in the shapes shown in the accompanying 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 accompanying drawings, but include changes in shape that may occur during manufacturing.

[0042] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0043] The first aspect of this application provides a battery housing that solves the problem that the existing battery housing insulation technology does not take into account the temperature difference of the individual battery cells inside the battery module.

[0044] The following reference Figures 1 to 6 The battery housing described in some embodiments of this application is described in detail.

[0045] In embodiments of this application, the battery housing includes a housing body and a battery module disposed inside the housing body. Figure 1 The battery module is not shown in the image; it is designed to mimic the shape of the casing. Figure 1 As shown, the battery module has two perpendicular directions: length (X), width (Y), and height (Z). The casing body has a first insulation layer on each of its opposite sides in the length direction (X), a second insulation layer on each of its opposite sides in the width direction (Y), and a third insulation layer on each of its opposite sides in the height direction (Z).

[0046] This application allows for the design of an insulation layer for the battery housing. The insulation layer design can be optimized according to the actual insulation capacity requirements, and the required insulation layer thickness in each direction of the battery housing can be determined to ensure that the thermal resistance of the battery housing is balanced in all directions, thereby improving the battery temperature uniformity and ultimately improving battery performance.

[0047] The specific design is as follows:

[0048] First, through experiments or simulations, identify 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 casing; and the thermal conductivity of the insulation material used.

[0049] Next, calculate the thermal resistance in each direction. The formula for calculating thermal resistance is:

[0050] Where R is the thermal resistance, L is the thickness of 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] Therefore, the thermal resistance of the battery module in this application in the length direction can be obtained. The thermal resistance of the battery module in the width direction The thermal resistance of the battery module in the height direction

[0052] Where, λ x1 Let λ be the thermal conductivity of the battery module along its length direction X. y1 Let λ be the thermal conductivity of the battery module in the width direction Y. z1 Let X be the thermal conductivity of the battery module in the height direction Z. D Let X be the dimension of the battery module in the length direction X, and Y be the dimension of the battery module in the length direction X. D Let Z be the dimension of the battery module in the width direction Y, and Z be the dimension of the battery module in the width direction Y. D Let denot be the dimension of the battery module in the height direction Z, and μ be the thermal resistance gain coefficient.

[0053] Therefore, the thermal resistance of the housing body in the length direction X of this application can be obtained. Thermal resistance of the box body in the width direction Y Thermal resistance of the box body in the height direction Z

[0054] Where, λ b t is the thermal conductivity of the insulation material. x t is the thickness of the first insulation layer 212. y t represents the thickness of the second insulation layer 222. z X represents the thickness of the third insulation layer 12. X Let X be the dimension of the box body in the length direction X, and Y be the dimension of the box body in the length direction X. X Let Z be the dimension of the box body in the width direction Y, and Z be the dimension of the box body in the width direction Y. X Let Z be the dimension of the box body in the height direction Z.

[0055] The formula for calculating the total thermal resistance of heat transfer through a multi-layered flat wall is:

[0056] The heat transfer process of the battery box in a certain direction can be approximated as heat transfer through multiple layers of flat walls of the insulation layer and battery module. Therefore, the thermal resistances of the insulated battery box in the X, Y, and Z directions are respectively:

[0057]

[0058] To ensure the temperature gradient is the same in all directions, the thermal resistance of the battery casing needs to be balanced in all directions, meaning the thermal resistance of the battery casing in the X, Y, and Z directions must be equal. Therefore:

[0059] In the formula, t x t y t z Except for the unknown, everything else is known. Therefore, the required thermal resistance can be determined based on the actual insulation requirements of the battery box, and thus the thickness t of the insulation layer in each direction can be determined. x t y t z The insulation layer design was completed.

[0060] μ is the thermal resistance gain coefficient, which ranges from 0 to 2. The thermal resistance gain coefficient is determined based on the actual arrangement of the battery modules inside the box, such as the gap between battery cells, the number of battery modules, the gap, and other structural components. The value of μ can be obtained by those skilled in the art based on experience.

[0061] In summary, this application designs insulation layers on the six sides of the battery box body based on the equalization of thermal resistance in all directions. Different thicknesses of insulation layers are matched to different positions of the battery box body to make the thermal resistance of the battery box body equal in all directions, so that the temperature gradient trend of the battery module in the X, Y, and Z directions is consistent, the heat dissipation in all directions is uniform, and the temperature of each surface of the battery cell tends to be consistent, thereby improving the battery temperature uniformity and thus improving the battery performance.

[0062] In the embodiments of this application, such as Figure 1 As shown, the box body includes an upper box 1, a lower box 3, and a frame 2; the frame 2 has a first insulation layer on both sides opposite to each other in the length direction X, a second insulation layer on both sides opposite to each other in the width direction Y, and a third insulation layer on both the upper box 1 and the lower box 3.

[0063] Specifically, the frame 2 includes two wide walls 21 that are opposite each other in the length direction X and two long walls 22 that are opposite each other in the width direction Y; a first insulation layer is provided on each of the two wide walls 21 and a second insulation layer is provided on each of the two long walls 22.

[0064] Preferably, the thickness of the first insulation layer 212 is 3mm, the thickness of the second insulation layer 222 is 4mm, and the thickness of the third insulation layer 12 is 5mm. This helps to better reduce the temperature difference between individual cells inside the battery module, ensure the temperature uniformity of the module, and thus improve battery performance and lifespan.

[0065] The coating structure of the upper box 1, lower box 3 and frame 2 will be described in detail below.

[0066] In the embodiments of this application, such as Figure 3 As shown in Figure 3, a third flame-retardant layer 13 is provided on the outer side of the upper casing 1, a third thermal insulation layer 12 is provided on the outer side of the third flame-retardant layer 13, and a third waterproof layer 11 is provided on the outer side of the third thermal insulation layer 12. That is, the coating on the outer side of the upper casing 1 consists of a sandwich structure composed of the third waterproof layer 11, the third thermal insulation layer 12, and the third flame-retardant layer 13. The third thermal insulation layer 12 has two bonding surfaces: one side is bonded to the third waterproof layer 11, and the other side is bonded to the third flame-retardant layer 13. From the inside out, the layers are arranged in the following order: the third flame-retardant layer 13, the third thermal insulation layer 12, and the third waterproof layer 11. As shown in Figure 3, the third waterproof layer 11 prevents liquid from entering the battery casing, the third thermal insulation layer 12 insulates the battery module and improves its temperature uniformity, and the third flame-retardant layer 13 prevents the spread of fire if it ignites inside the battery casing. In this embodiment, the third thermal insulation layer 12, the third waterproof layer 11, and the third flame-retardant layer 13 are bonded together with modified adhesive.

[0067] In the embodiments of this application, such as Figure 1As shown, the frame 2 is a metal frame (made of aluminum alloy using a stamping integrated process). The frame 2 includes two wide walls 21 that are opposite each other in the length direction X and two long walls 22 that are opposite each other in the width direction Y.

[0068] like Figure 5 As shown, a first insulation layer 212 is provided on the inner side of each of the two wide walls 21, and a first flame retardant layer 211 is provided on the inner side of the first insulation layer 212; the first insulation layer 212 has two bonding surfaces, the first insulation layer 212 is bonded to the wide wall 21 with adhesive, and the first insulation layer 212 is bonded to the first flame retardant layer 211 with modified adhesive.

[0069] like Figure 6 As shown, a second insulation layer 222 is provided on the inner side of each of the two long walls 22, and a second flame-retardant layer 221 is provided on the inner side of the second insulation layer 222; the second insulation layer 222 has two bonding surfaces, the second insulation layer 222 is bonded to the long wall 22 with adhesive, and the second insulation layer 222 is bonded to the second flame-retardant layer 221 with modified adhesive.

[0070] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, the battery housing also includes multiple adapters 24 and multiple support beams 25. The multiple adapters 24 are divided into two groups, and the two groups of adapters 24 are welded to the inner sides of the two long walls 22 respectively (avoiding the insulation layer and flame retardant layer). The multiple adapters 24 in one group correspond one-to-one with the multiple adapters 24 in the other group. The two ends of the support beams 25 are respectively connected to two corresponding adapters 24 by bolts, and the multiple support beams 25 can support the battery module.

[0071] Furthermore, such as Figure 2 As shown, a heat-insulating bolt washer 26 is provided between the adapter 24 and the support beam 25. Thus, the heat-insulating bolt washer 26 at the joint serves to prevent the support beam 25 from conducting heat from the battery module to the frame 2 (metal frame), achieving a heat insulation effect. The bolt passes through the adapter 24, the heat-insulating bolt washer 26, and the support beam 25 sequentially from top to bottom. The support beam 25 has threads machined into it for connection with the bolts.

[0072] In an embodiment of this application, the lower housing 3 includes a liquid cooling plate 31, which is capable of conforming to the battery module. Here, for example, the liquid cooling plate 31 is designed to avoid multiple support beams 25 so as to contact and conform to the bottom surface of the battery module.

[0073] like Figure 4As shown, a third insulation layer 12 is provided on the outer side of the liquid cooling plate 31, and a third waterproof layer 11 is provided on the outer side of the third insulation layer 12. Here, water at 60°C is circulated in the liquid cooling plate 31, and a pressure of 250±5T is applied. The curing temperature is 160±5°C, and the curing time is 910 minutes. The liquid cooling plate 31 is then bonded to the third insulation layer 12 through heating and pressurization. The third insulation layer 12 and the third waterproof layer 11 are bonded together with modified adhesive.

[0074] In the embodiments of this application, the first insulation layer 212, the second insulation layer 222, and the third insulation layer 12 can all be made of polyurethane foam with good thermal insulation performance and a density of 70 kg / m³. 3 The thermal conductivity is 0.025 W / (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 or ABS materials.

[0075] In this embodiment, the third insulation layer 12 of the liquid cooling plate 31 is disposed on the outside of the liquid cooling plate 31, and the third insulation layer 12 of the upper housing 1 is disposed on the outside of the upper housing 1. This design of the insulation layer can increase the internal space of the battery housing for battery module installation, which can further improve the battery energy density; secondly, when the battery housing is installed with the car, the outer insulation layer can play a role in shock absorption and noise reduction.

[0076] It's also worth noting that existing battery module housings typically consist of an upper cover and a lower housing, both made of stamped or extruded steel or aluminum, connected by welding or mechanical means. While this type of battery module housing meets safety requirements, such as resistance to expansion forces or random vibrations, its overall structure is too heavy, limiting the battery module's energy density and the vehicle's driving range. Furthermore, the upper cover and lower housing structure not only increases manufacturing complexity, but also makes repairs and replacements difficult due to the potential for battery cells to age or be damaged during use.

[0077] In the embodiments of this application, such as Figure 1 As shown, the enclosure body includes an upper enclosure 1, a lower enclosure 3, and a frame 2. The upper enclosure 1 is bolted to the frame 2. Threads are machined at the four corners of the upper part of the frame 2. The bolts pass through the upper enclosure 1 and connect to the frame 2. Waterproof sealant is applied at the contact points to waterproof the enclosure. The lower enclosure 3 (liquid cooling plate 31) is bolted to the frame 2. Threads are machined at the four corners of the lower part of the frame 2. The bolts pass through the lower enclosure 3 and connect to the frame 2. Waterproof sealant is applied at the contact points to waterproof the enclosure.

[0078] Compared with existing technologies, this application adopts a sandwich structure consisting of an upper housing 1, a frame 2, and a lower housing 3 (the frame 2 is manufactured using an integrated aluminum alloy plate stamping process) to optimize the power battery housing structure. The upper housing 1 is bolted to the frame 2, and the lower housing 3 is bolted to the frame 2. This structural design and assembly method effectively reduces welding and assembly processes, improving forming efficiency. The final housing structure possesses excellent strength, rigidity, and lightweight properties.

[0079] Furthermore, the battery housing is divided into upper, middle, and lower sections for improved maintainability. Bolts and adhesives are used to connect the various parts, making the overall battery housing more robust and reliable. Support beams and connectors allow the frame to bear the weight of the battery modules, reducing the weight of the upper and lower housings and making the entire power battery pack lighter.

[0080] Furthermore, to optimize the function of the power battery housing, the outer side of the housing is equipped with a waterproof layer, a heat insulation layer, and a flame-retardant layer, which can block liquids, reduce heat loss, and prevent the spread of fire, thereby improving the performance and safety of the power battery.

[0081] Furthermore, regarding the optimization of the insulation layer of the power battery casing, since the thermal conductivity of individual battery cells is anisotropic, it is required that the temperature gradient trends in the X, Y, and Z directions of the battery module be consistent, and that heat transfer be uniform in all directions. This application designs insulation layers on the six external surfaces of the battery module based on the principle of equalizing thermal resistance in all directions. Different thicknesses of insulation layers are matched to different locations in the battery casing to make the temperature on all surfaces of the battery tend to be uniform, improve the temperature uniformity of the battery, and thus improve battery performance.

[0082] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in this application, or make equivalent substitutions for some of the technical features. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application.

Claims

1. A battery housing, characterized in that, The battery enclosure includes a main body and battery modules disposed inside the main body. The battery modules have two perpendicular length directions, width directions and height directions. The box body is provided with a first insulation layer on both sides opposite to each other in the length direction, a second insulation layer on both sides opposite to each other in the width direction, and a third insulation layer on both sides opposite to each other in the height direction. The thermal resistance of the battery module in the length direction The thermal resistance of the battery module in the width direction The thermal resistance of the battery module in the height direction Where, λ x1 Let λ be the thermal conductivity of the battery module along its length. y1 Let λ be the thermal conductivity of the battery module in the width direction. z1 X represents the thermal conductivity of the battery module in the height direction. D Y represents the dimension of the battery module in the length direction. D Z represents the dimension of the battery module in the width direction. D Let μ be the dimension of the battery module in the height direction, and μ be 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 Where, λ b t is the thermal conductivity of the insulation material. x t represents the thickness of the first insulation layer. y t represents the thickness of the second insulation layer. z X represents the thickness of the third insulation layer. X Y is the dimension of the box body in the length direction. X Z represents the width dimension of the box body. X This refers to the dimension of the box body in the height direction; 2. The battery housing according to claim 1, characterized in that, The box body includes an upper box body, a lower box body, and a frame; The top of the frame is provided with a first threaded hole, and the upper housing is provided with a first threaded mounting hole corresponding to the first threaded hole. The bottom of the frame is provided with a second threaded hole, and the lower box is provided with a second threaded mounting hole corresponding to the second threaded hole; The frame is provided with the first insulation layer on both sides opposite to each other in the length direction, the frame is provided with the second insulation layer on both sides opposite to each other in the width direction, and the upper box and the lower box are both provided with the third insulation layer.

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

4. The battery housing according to claim 2, characterized in that, The outer side of the upper housing is provided with a third flame-retardant layer, the outer side of the third flame-retardant layer is provided with a third thermal insulation layer, and the outer side of the third thermal insulation layer is provided with a third waterproof layer.

5. The battery housing according to claim 4, characterized in that, The frame includes two wide walls that are opposite each other in the length direction and two long walls that are opposite each other in the width direction; The first insulation layer is provided on the inner side of both wide walls, and a first flame-retardant layer is provided on the inner side of the first insulation layer; The inner sides of both long walls are provided with a second insulation layer, and the inner side of the second insulation layer is provided with a second flame-retardant layer.

6. The battery housing according to claim 2, characterized in that, The lower housing includes a liquid cooling plate, which can be attached to the battery module. The liquid cooling plate is provided with a second threaded mounting hole corresponding to the second threaded hole; The liquid cooling plate is provided with a third insulation layer on its outer side, and a third waterproof layer is provided on its outer side.

7. The battery housing according to claim 5, characterized in that, The battery housing also includes multiple adapters and multiple 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; One set of multiple adapters corresponds one-to-one with another set of multiple adapters; The two ends of the support beam are respectively connected to two corresponding adapters by bolts, and the multiple support beams can support the battery module.

8. The battery housing according to claim 7, characterized in that, A heat-insulating bolt washer is provided between the adapter and the support beam; Waterproof sealant is applied to the seams between the upper housing and the frame, as well as the seams between the lower housing and the frame.

9. The battery housing according to claim 5, characterized in that, The first insulation layer, the second insulation layer, and the third 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. A car, characterized in that, Includes the battery housing as described in any one of claims 1-9.

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