Insulation box structure, battery pack and control method

Abstract

The present invention discloses a thermal insulation box structure, a battery pack and a control method, wherein the thermal insulation box structure comprises: a lower shell assembly, wherein the lower shell assembly comprises a frame and a bottom guard plate, wherein the frame is connected to the bottom guard plate and defines an installation cavity for installing a battery module; a thermal insulation covering layer, wherein the thermal insulation covering layer is coated on the outer peripheral wall of the frame; and a bottom thermal insulation structure, wherein the bottom thermal insulation structure is installed in the installation cavity, and the bottom thermal insulation structure is located at the bottom of the battery module and is connected to one side of the bottom guard plate. The thermal insulation box structure of the present invention can enhance the thermal insulation effect of the thermal insulation box structure on the battery module in the circumferential direction of the thermal insulation box structure, and can insulate the battery module below the battery module through the bottom thermal insulation structure, thus enhancing the thermal insulation effect of the thermal insulation box structure on the battery module.

Description

Technical Field

[0001] The present invention relates to the technical field of battery insulation boxes, and in particular to a thermal insulation box structure, a battery pack and a control method. Background Art

[0002] In recent years, as environmental and energy problems have become increasingly severe, companies and governments in many major economies around the world have paid more and more attention to the research and development and production of electric vehicles. As a key component of electric vehicles, power batteries have poor low-temperature performance, which causes a significant reduction in the range of electric vehicles in winter, causing great complaints from consumers.

[0003] In the related art, when keeping the battery pack warm in winter, thermal insulation cotton is usually added inside the battery pack. However, most traditional battery packs have an aluminum alloy shell or a steel shell structure, so that the traditional insulation solution cannot solve the problem of temperature bypassing the thermal insulation cotton and dissipating from the installation path of the battery module, resulting in poor thermal insulation effect of the battery pack. There is room for improvement. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a heat preservation box structure, which can enhance the heat preservation effect of the heat preservation box structure on the battery module.

[0005] According to an embodiment of the present invention, the thermal insulation box structure includes: a lower shell assembly, the lower shell assembly includes a frame and a bottom guard plate, the frame is connected to the bottom guard plate and defines an installation cavity for installing a battery module; an insulation covering layer, the insulation covering layer is coated on the outer peripheral wall of the frame; a bottom insulation structure, the bottom insulation structure is installed in the installation cavity, and the bottom insulation structure is located at the bottom of the battery module and connected to one side of the bottom guard plate.

[0006] According to the thermal insulation box structure of the embodiment of the present invention, by arranging a thermal insulation covering layer on the outer peripheral wall of the frame, the thermal insulation effect of the thermal insulation box structure on the battery module can be enhanced in the circumferential direction of the thermal insulation box structure, and by arranging a bottom thermal insulation structure between the bottom of the battery module and the bottom guard plate, the battery module can be insulated below the battery module through the bottom thermal insulation structure, thus, the thermal insulation effect of the thermal insulation box structure on the battery module can be enhanced.

[0007] According to the thermal insulation box structure of some embodiments of the present invention, the bottom thermal insulation structure includes a first plate and a second plate, the first plate is suitable for being connected to the bottom of the battery module, the second plate is connected to the side of the bottom guard plate, and an insulation layer is sandwiched between the first plate and the second plate; and / or the bottom thermal insulation structure also includes: a reinforcing rib plate, the reinforcing rib plate is sandwiched between the first plate and the second plate, and the insulation layer is suitable for being filled in the filling cavity of the reinforcing rib plate.

[0008] According to some embodiments of the present invention, the insulation box structure also includes: at least two insulation beam assemblies, the insulation beam assemblies are installed in the installation cavity, and an installation space is defined between two adjacent insulation beam assemblies, the battery module is located in the installation space and is attached to the two insulation beam assemblies on both sides; wherein the insulation beam assembly includes a pultruded profile beam and two mounting seats, the two mounting seats are respectively connected to two relatively distributed inner walls of the installation cavity, and the pultruded profile beam is connected between the two mounting seats.

[0009] According to some embodiments of the present invention, the thermal insulation box structure further includes: a water-cooled plate assembly, wherein the water-cooled plate assembly includes a water-cooled plate and a conformable thermal insulation structure, the water-cooled plate is installed on the upper side of the battery module, and the conformable thermal insulation structure is coated on the upper side of the water-cooled plate; the thermal insulation covering layer is provided with an extended flange, the extended flange extends to a side of the water-cooled plate away from the battery module, the extended flange is fitted with a side of the water-cooled plate away from the battery module and is connected to the conformable thermal insulation structure.

[0010] The invention also provides a battery pack.

[0011] A battery pack according to an embodiment of the present invention comprises: at least one battery module; and a box body, wherein the box body is the thermal insulation box body structure described in any one of the above items, and at least one battery module is arranged in the thermal insulation box body structure.

[0012] The battery pack according to some embodiments of the present invention further includes: a first heating film and a second heating film, the first heating film is provided on at least one side of the battery module in a first direction, and the second heating film is provided on at least one side of the battery module in a second direction, and the first direction is perpendicular to the second direction.

[0013] The battery pack according to some embodiments of the present invention further includes: a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is suitable for detecting the temperature of a middle area of ​​the battery module, and the second temperature sensor is suitable for detecting the temperature of an edge area of ​​the battery module.

[0014] The present invention also provides a control method for a battery pack.

[0015] According to the control method of the battery pack of an embodiment of the present invention, the control method is applied to the above-mentioned battery pack, and the control method includes: within a first set time, obtaining a first temperature difference between a first temperature sense and a second temperature sense and obtaining a cooling rate of the second temperature sense; when the first temperature difference is greater than a first set temperature and the cooling rate of the second temperature sense is greater than the first set rate, controlling the first heating film and / or the second heating film to heat the battery module with a first set power; when the first temperature difference is greater than the first set temperature and the cooling rate of the second temperature sense is less than the first set rate, controlling the first heating film and / or the second heating film to heat the battery module with a second set power.

[0016] According to the control method of a battery pack in some embodiments of the present invention, the control method further includes: obtaining the cooling rate of the second temperature sense and obtaining the second temperature difference between the first temperature sense and the second temperature sense within a second set time; when the cooling rate of the second temperature sense is greater than the second set rate and the second temperature difference is greater than the second set temperature, controlling the first heating film and / or the second heating film to heat the battery module with a third set power; when the cooling rate of the second temperature sense is greater than the second set rate and the second temperature difference is less than the second set temperature, controlling the first heating film and / or the second heating film to heat the battery module with a fourth set power.

[0017] According to the control method of the battery pack of some embodiments of the present invention, the control method further includes: when the cooling rate of the second temperature sensor is less than or equal to a third set rate, controlling the first heating film and / or the second heating film to stop heating the battery module.

[0018] The control method, the battery pack and the above-mentioned heat-insulating box structure have the same advantages as those of the prior art, which will not be described in detail here.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A side view of the battery pack shown in ;

[0023] Figure 3yes Figure 1 A top view of the battery pack shown in ;

[0024] Figure 4 yes Figure 1 A schematic diagram of the other side of the battery pack shown in ;

[0025] Figure 5 yes Figure 4 Sectional view at AA in the middle;

[0026] Figure 6 yes Figure 1 A partial exploded view of the battery pack shown in ;

[0027] Figure 7 yes Figure 1 An exploded view of the battery pack shown in;

[0028] Figure 8 yes Figure 7 An exploded view of the lower shell assembly and the thermal insulation cover shown in FIG.

[0029] Fig. 9 yes Figure 7 A schematic diagram showing that the thermal insulation beam assembly of the battery pack is installed on the lower housing assembly;

[0030] Fig.10 yes Fig. 9 An exploded view of the thermal insulation beam assembly shown in FIG. 1 is mounted on the lower shell assembly;

[0031] Fig.11 yes Figure 7 Schematic diagram of the bottom insulation structure of the battery pack shown in;

[0032] Fig.12 yes Fig.11 An exploded view of the bottom insulation structure shown in;

[0033] Fig.13 yes Fig.11 A side view of the bottom insulation structure shown in;

[0034] Fig.14 yes Fig.13 The cross-sectional view at BB in FIG.

[0035] Fig.15 yes Figure 7 Schematic diagram of the thermal insulation beam assembly of the battery pack shown in;

[0036] Fig.16 yes Fig.15 A schematic diagram of a mounting base for the insulation beam assembly shown in ;

[0037] Fig.17 yes Fig.15A schematic diagram of another perspective of the insulation beam assembly shown in ;

[0038] Fig.18 yes Figure 7 A schematic diagram of a battery module of a battery pack shown in ;

[0039] Fig.19 yes Figure 7 An exploded view of the water cooling plate assembly shown in FIG.

[0040] Fig. 20 yes Fig.19 A schematic diagram of a water cooling plate assembly shown in ;

[0041] Fig.21 yes Fig. 20 Sectional view at CC;

[0042] Fig. 22 yes Fig.21 The enlarged view of point D in the middle;

[0043] Fig.23 is an exploded view of a battery pack according to some other embodiments of the present invention;

[0044] Fig.24 yes Fig.23 A schematic diagram showing a first heating film installed on a frame;

[0045] Fig.25 yes Fig.23 A schematic diagram of a second heating film installed in a battery module as shown in FIG.

[0046] Fig.26 is one of the flow charts of a method for controlling a battery pack according to some embodiments of the present invention;

[0047] Fig. 27 is a second flowchart of a method for controlling a battery pack according to some embodiments of the present invention;

[0048] Fig.28 This is a third flowchart of a method for controlling a battery pack according to some embodiments of the present invention.

[0049] Reference numerals:

[0050] Battery Pack 1000,

[0051] Insulation box structure 100, battery module 200,

[0052] Lower housing assembly 10,

[0053] Frame 11, bottom guard plate 12,

[0054] Insulation cover layer 20, extended flange 21,

[0055] Bottom insulation structure 30,

[0056] First plate 31, support protrusion 311, second plate 32, insulation layer 33, reinforcing rib 34, filling cavity 341,

[0057] Insulation beam assembly 40,

[0058] Pultruded profile beam 41, mounting seat 42, fixing portion 421, connecting portion 422, plug-in slot 423, reinforcing rib 424, water-cooling plate assembly 50, thermal conductive structural adhesive 51, conformal thermal insulation structure 52, structural adhesive 53, water-cooling plate 54

[0059] Insulation cotton 60,

[0060] A first heating film 71 , a second heating film 72 , an end heating portion 721 , a middle heating portion 722 , and a connecting portion 723 . DETAILED DESCRIPTION

[0061] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0062] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0063] Reference below Figure 1-Figure 28 A heat-insulating box structure 100 according to an embodiment of the present invention is described.

[0064] like Figure 7 As shown, the thermal insulation box structure 100 according to the embodiment of the present invention includes: a lower shell assembly 10, a thermal insulation covering layer 20 and a bottom thermal insulation structure 30.

[0065] Specifically, Fig. 9As shown, the lower shell assembly 10 includes a frame 11 and a bottom guard plate 12, the frame 11 is connected to the bottom guard plate 12 and defines an installation cavity for installing the battery module 200, the thermal insulation covering layer 20 is coated on the outer peripheral wall of the frame 11, the bottom thermal insulation structure 30 is installed in the installation cavity, and the bottom thermal insulation structure 30 is located at the bottom of the battery module 200 and connected to one side of the bottom guard plate 12.

[0066] It should be noted that if Figure 8 As shown, the outer peripheral wall of the frame 11 refers to the side wall of the frame 11 facing away from the battery module 200 .

[0067] It can be understood that the frame 11 is connected to the bottom guard plate 12 to define an installation cavity, and the battery module 200 can be installed in the installation cavity to achieve protection and insulation of the battery module 200, and by providing an insulation covering layer 20 on the outer peripheral wall of the frame 11, the insulation effect of the insulation box structure 100 on the battery module 200 can be enhanced in the circumferential direction of the insulation box structure 100, and the bottom insulation structure 30 can insulate the battery module 200 below the battery module 200. At the same time, the bottom insulation structure 30 is located between the bottom of the battery module 200 and the bottom guard plate 12, so as to make full use of the installation space in the installation cavity.

[0068] Therefore, the thermal insulation cover layer 20 and the bottom thermal insulation structure 30 can respectively insulate the battery module 200 in the circumference and bottom of the battery module 200 , thereby enhancing the thermal insulation effect of the thermal insulation box structure 100 on the battery module 200 .

[0069] For example Fig. 9 As shown, the frame 11 may be a square frame, and the bottom guard plate 12 is connected to the square frame to define an upwardly open installation cavity, and the battery module 200 may be installed into the installation cavity through the open opening of the installation cavity.

[0070] Among them, the two opposite sides of the square frame can be provided with poles electrically connected to the pole ears of the battery module 200, so that when the battery module 200 is installed in the insulation box structure 100, it can be electrically connected to the external structure through the poles to realize the charging and discharging of the battery module 200.

[0071] Furthermore, the thermal insulation covering layer 20 is coated on the outer peripheral wall of the frame 11, that is, the thermal insulation covering layer 20 is located on the side of the frame 11 away from the installation cavity, so as to enhance the thermal insulation effect of the thermal insulation box structure 100 on the battery module 200 in the circumferential direction of the thermal insulation box structure 100.

[0072] For example, the thermal insulation covering layer 20 may be an integral frame structure, which is directly mounted on the outer peripheral wall of the frame 11, and is provided with an escape opening for evading the poles to avoid interference between the integral frame structure and the poles, thereby reducing the difficulty of assembling the integral frame structure.

[0073] Alternatively, the heat-insulating cover layer 20 may be a plate-like structure, and a plurality of plate-like structures are provided. When the frame 11 is constructed as a square frame, Figure 6-Figure 8 As shown, there are four plate-like structures, which can be respectively installed on the four outer wall surfaces of the square frame in the circumferential direction. Among them, two oppositely arranged plate-like structures are provided with avoidance openings for avoiding the poles to avoid interference between the plate-like structures and the poles, which is conducive to reducing the difficulty of assembling the plate-like structures.

[0074] It should be noted that the thermal insulation covering layer 20 and the frame 11 may be connected by welding, bonding, snapping, plugging, magnetic attraction, etc., which is not limited here.

[0075] Therefore, by providing the heat-insulating cover layer 20 , the heat-insulating effect of the heat-insulating box structure 100 on the battery module 200 can be enhanced in the circumferential direction of the heat-insulating box structure 100 .

[0076] Furthermore, if Figure 7 As shown, the bottom insulation structure 30 is installed between the bottom of the battery module 200 and the bottom guard plate 12, that is, the bottom insulation structure 30 is clamped between the battery module 200 and the bottom guard plate 12 to enhance the stability of the bottom insulation structure 30. On the one hand, the bottom insulation structure 30 can insulate the battery module 200 below the battery module 200. On the other hand, the bottom insulation structure 30 is located in the installation cavity so as to make full use of the installation space in the installation cavity.

[0077] According to the thermal insulation box structure 100 of the embodiment of the present invention, by arranging a thermal insulation covering layer 20 on the outer peripheral wall of the frame 11, the thermal insulation effect of the thermal insulation box structure 100 on the battery module 200 can be enhanced in the circumferential direction of the thermal insulation box structure 100, and by arranging a bottom thermal insulation structure 30 between the bottom of the battery module 200 and the bottom guard plate 12, the bottom thermal insulation structure 30 can be used to insulate the battery module 200 below the battery module 200, thereby enhancing the thermal insulation effect of the thermal insulation box structure 100 on the battery module 200.

[0078] In some embodiments, Figure 11-Figure 14As shown, the bottom thermal insulation structure 30 includes a first plate 31 and a second plate 32. The first plate 31 is adapted to be connected to the bottom of the battery module 200, and the second plate 32 is adhesively connected to the side surface of the bottom guard plate 12. A thermal insulation layer 33 is clamped between the first plate 31 and the second plate 32; and / or the bottom thermal insulation structure 30 further includes: a reinforcing rib plate 34, the reinforcing rib plate 34 is clamped between the first plate 31 and the second plate 32, and the thermal insulation layer 33 is adapted to be filled in the filling cavity 341 of the reinforcing rib plate 34.

[0079] Thus, by arranging the thermal insulation layer 33 between the first plate 31 and the second plate 32, the thermal insulation effect of the bottom thermal insulation structure 30 can be enhanced, and further the thermal insulation effect of the bottom thermal insulation structure 30 on the battery module 200 can be enhanced.

[0080] For example, the bottom thermal insulation structure 30 is a composite material plate. Both the first plate 31 and the second plate 32 are composed of polyurethane composite materials, and both the first plate 31 and the second plate 32 are respectively formed by the RTM (Resin Transfer Molding) process. The thermal insulation layer 33 is foamed polyurethane, that is, the thermal insulation layer 33 is formed by polyurethane foaming. Polyurethane materials have the advantages of light weight and excellent heat insulation performance, so that the bottom thermal insulation structure 30 has better thermal insulation performance. At the same time, the bottom thermal insulation structure 30 formed by polyurethane composite materials is lighter in weight, which can make the overall weight of the thermal insulation box structure 100 lighter and is conducive to realizing the lightweight design of the thermal insulation box structure 100.

[0081] Furthermore, the first plate 31 and the second plate 32 are made of polyurethane composite materials. Using rigid polyurethane composite materials can make the first plate 31 and the second plate 32 have higher strength and can play a better protective role for the battery module 200. The thermal insulation layer 33 is formed by polyurethane foaming. When the soft polyurethane is filled between the first plate 31 and the second plate 32, it can be filled more fully, and the thermal insulation effect is better during thermal insulation.

[0082] Furthermore, by arranging the reinforcing rib plate 34, the stiffness of the bottom thermal insulation structure 30 itself can be increased, and the ability of the bottom thermal insulation structure 30 to support the battery module 200 can be improved. At the same time, the thermal insulation layer 33 is filled in the filling cavity 341 of the reinforcing rib plate 34. On the one hand, the thermal insulation effect of the bottom thermal insulation structure 30 can be enhanced. On the other hand, the filling cavity 341 of the reinforcing rib plate 34 can be fully utilized to facilitate reducing the volume of the bottom thermal insulation structure 30 and is conducive to realizing the miniaturization design of the bottom thermal insulation structure 30.

[0083] For example, the reinforcing rib plate 34 can be made of fiber-reinforced materials. Fiber-reinforced materials have the advantages of light weight and high strength. At the same time, as Fig.12 shown, the reinforcing rib plate 34 is composed of a combination of multiple "mouth" - shaped structures, and a filling cavity 341 is defined within each "mouth" - shaped structure. As Fig.14As shown, the insulation layer 33 is filled in the filling cavity 341 , so that after the bottom plate insulation structure is formed, the strength of the bottom insulation structure 30 can be strengthened and the insulation effect of the bottom insulation structure 30 can be enhanced.

[0084] It should be noted that in the up and down directions, there are gaps between the reinforcing ribs 34 and the first plate 31 and the second plate 32 , so that the heat dissipation path between the ribs and the first plate 31 and the second plate 32 can be disconnected, thereby improving the heat preservation capacity.

[0085] When assembling the bottom insulation structure 30, the second plate 32 can be placed in the mold first, and then the reinforcing ribs 34 can be placed. Polyurethane foaming is performed in the filling cavity 341 of the reinforcing ribs 34 to form an insulation layer 33. Then the first plate 31 is placed and molded to form the bottom insulation structure 30.

[0086] In some embodiments, Figure 9-13 As shown, the first plate 31 is provided with a plurality of supporting protrusions 311 , and the supporting protrusions 311 are protruded from the surface of the first plate 31 toward the installation cavity, and the supporting protrusions 311 are used to support the battery module 200 .

[0087] It can be understood that the first plate 31 is provided with a plurality of support protrusions 311, and the support protrusions 311 protrude toward the installation cavity. In this way, after the battery module 200 is installed in the installation cavity, the support protrusions 311 can support the battery module 200 to reduce the contact area between the battery module 200 and the bottom plate, which is beneficial to reduce the heat dissipation area, and can improve the thermal insulation performance of the thermal insulation box structure 100, while providing a safe gap for the battery module 200 to withstand bottom ball impact.

[0088] For example, the support protrusion 311 structure may be a separate molded part, and the support protrusion 311 may be fixed to the side of the first plate 31 facing the installation cavity, or the support protrusion 311 structure may be integrally molded with the first plate 31 to reduce the difficulty of setting the support protrusion 311.

[0089] In this way, after the battery module 200 is placed in the installation cavity, the bottom of the battery module 200 is not entirely in contact with the first plate 31, and the bottom of the battery module 200 is only in contact with the support protrusion 311. In this way, a partial gap can be formed between the bottom of the battery module 200 and the first plate 31. The air in the gap can become a good thermal insulation medium. At the same time, the gap can also provide a certain safety space for the battery module 200, so that there can be a certain buffer space after the bottom of the thermal insulation box structure 100 is hit.

[0090] For example, in the thickness direction of the first plate 31, the thickness S of the supporting protrusion 311 is (0.5-1.0) times the thickness of the first plate 31, the thickness Y of the foamed polyurethane of the thermal insulation layer 33, and the selection of the thickness Y is inversely proportional to the density ρ, satisfying the proportional relationship of thickness Y≥40ρ+4, the thickness of the foamed polyurethane is ≥ the thickness of the first plate 31 or the thickness of the second plate 32, wherein the thickness of the first plate 31 and / or the thickness of the second plate 32 ranges from 1mm to 2mm. When the relevant data of the first plate 31, the second plate 32 and the thermal insulation layer 33 satisfy the above relationship, the strength of the bottom thermal insulation structure 30 can be guaranteed while ensuring the thermal insulation performance of the bottom thermal insulation structure 30.

[0091] In some embodiments, Fig. 9 and Fig.10 As shown, the insulation box structure 100 also includes: at least two insulation beam assemblies 40, the insulation beam assembly 40 is installed in the installation cavity, and an installation space is defined between two adjacent insulation beam assemblies 40, the battery module 200 is located in the installation space and is attached to the two insulation beam assemblies 40 on both sides; wherein the insulation beam assembly 40 includes a pultruded profile beam 41 and two mounting seats 42, the two mounting seats 42 are respectively connected to two relatively distributed inner walls of the installation cavity, and the pultruded profile beam 41 is connected between the two mounting seats 42.

[0092] Therefore, by providing the thermal insulation beam assembly 40 , the heat exchange path between two adjacent battery modules 200 can be cut off, and the heat exchange path between the battery module 200 and the frame 11 can be cut off conveniently, thereby enhancing the thermal insulation effect of the thermal insulation box structure 100 .

[0093] For example Fig. 9 and Fig.10 As shown, three thermal insulation beam assemblies 40 can be provided, and the three thermal insulation beam assemblies 40 can be installed in the lower shell assembly 10 in sequence at a certain distance to partition the installation cavity of the lower shell assembly 10, and the battery module 200 can be installed in the corresponding interval, that is, the thermal insulation beam assembly 40 can divide the battery module 200 into several groups according to the area, so as to better manage the battery module 200.

[0094] Among them, the thermal insulation beam assembly 40 located in the middle can cut off the heat exchange path between two adjacent battery modules 200, and the thermal insulation beam assembly 40 can be used as the cross beam in the related technology, so that the heat exchange path between the battery module 200 and the lower shell assembly 10 through the cross beam can be cut off, thereby improving the thermal insulation performance of the thermal insulation box structure 100.

[0095] The thermal insulation beam assemblies 40 located on both sides can cut off the heat exchange path between the battery module 200 and the frame 11, thereby improving the thermal insulation performance of the thermal insulation box structure 100.

[0096] Therefore, it is convenient to fix the thermal insulation beam assembly 40 in the installation cavity to enhance the structural stability of the thermal insulation beam assembly 40 .

[0097] For example, the connection method between the mounting seat 42 and the inner wall of the mounting cavity can be riveting, welding or bonding. The pultruded profile beam 41 has poor thermal conductivity. After the battery module 200 is installed, the pultruded profile beam 41 can isolate the battery module 200 from the heat exchange path between the insulation beam assembly 40 and the first plate 31.

[0098] In some embodiments, Fig.15 and Fig.16 As shown, the mounting seat 42 includes a fixing portion 421 and a connecting portion 422 . The fixing portion 421 is connected to the inner wall of the mounting cavity. A plug-in groove 423 is formed in the connecting portion 422 . The end of the pultruded profile beam 41 is plugged into the plug-in groove 423 .

[0099] Thus, the pultruded profile beam 41 can be plugged into the mounting seat 42 to enhance the connection stability between the pultruded profile beam 41 and the mounting seat 42 .

[0100] For example Fig.15 As shown, the mounting seat 42 can be constructed as a "T"-shaped structure, and the mounting portion is constructed as a plate-shaped structure, so as to increase the connection area between the mounting portion and the inner wall of the mounting cavity. Fig.16 As shown, a U-shaped insertion groove 423 may be formed in the connecting portion 422, and the pultruded profile beam 41 can be inserted into the insertion groove 423 to achieve the fixation of the pultruded profile beam 41, and after the pultruded profile beam 41 is inserted into the insertion groove 423, as shown in FIG. Fig.17 As shown, the bottom of the pultruded profile beam 41 is exposed by the opening of the plug-in groove 423, so that the bottom of the pultruded profile beam 41 can be bonded to the first plate 31. In this way, the pultruded profile beam 41 is completely positioned. At this time, the insulation beam structure is supported between the two opposite inner walls of the installation cavity to enhance the rigidity of the lower shell assembly 10.

[0101] Among them, the mounting seat 42 can limit the movement of the pultruded profile beam 41 in the length direction perpendicular to the pultruded profile beam 41, and the mounting seat 42 and the first plate 31 jointly limit the movement of the pultruded profile beam 41 in the height direction, thereby achieving an improvement in the rigidity of the lower shell assembly 10.

[0102] For example, the dimension of the pultruded profile beam 41 embedded in the plug-in slot 423 is defined as 25mm-40mm. If the dimension of the pultruded profile beam 41 embedded in the plug-in slot 423 is too short, it will lead to insufficient connection strength. If the dimension of the pultruded profile beam 41 embedded in the plug-in slot 423 is too long, it will cause the battery module 200 to partially overlap with the connecting part 422, resulting in an increase in the heat dissipation path.

[0103] Therefore, when the size of the pultruded profile beam 41 embedded in the plug-in groove 423 meets the above-mentioned value range, the connection strength between the pultruded profile beam 41 and the mounting seat 42 can be guaranteed, and the battery module 200 can be prevented from partially overlapping with the connecting part 422, so as to ensure the insulation effect of the insulation box structure 100.

[0104] In some embodiments, Figure 15-17 As shown, the mounting seat 42 further includes a reinforcing rib 424 , and the reinforcing rib 424 is connected between the fixing portion 421 and the connecting portion 422 .

[0105] Therefore, by providing the reinforcing rib 424 , and connecting the reinforcing rib 424 between the fixing portion 421 and the connecting portion 422 , the connection stiffness between the fixing portion 421 and the connecting portion 422 can be strengthened, so that the mounting seat 42 can provide sufficient connection strength to avoid deformation of the connecting portion 422 .

[0106] In some embodiments, Figure 1 , Figure 3 , Figure 5-Figure 7 As shown, the thermal insulation box structure 100 further includes: a water cooling plate assembly 50 .

[0107] The water-cooling plate assembly 50 includes a water-cooling plate 54 and a conformable thermal insulation structure 52. The water-cooling plate 54 is installed on the upper side of the battery module 200, and the conformable thermal insulation structure 52 is covered on the upper side of the water-cooling plate 54. The thermal insulation covering layer 20 is provided with an extended flange 21, which extends to the side of the water-cooling plate 54 away from the battery module 200. The extended flange 21 is in contact with the side of the water-cooling plate 54 away from the battery module 200 and is connected to the conformable thermal insulation structure 52.

[0108] It is understandable that the water cooling plate assembly 50 is installed on the upper side of the battery module 200 , so that when the battery module 200 needs to dissipate heat, the water cooling plate 54 can exchange heat with the battery module 200 to achieve cooling of the battery module 200 .

[0109] Furthermore, the thermal insulation covering layer 20 is provided with an extended flange 21, which extends to the side of the water-cooling plate 54 away from the battery module 200. The extended flange 21 is attached to the side of the water-cooling plate 54 away from the battery module 200 and is connected to the conformal thermal insulation structure 52. In this way, the extended flange 21 and the conformal thermal insulation structure 52 can jointly cover the upper side of the water-cooling plate 54 to enhance the protection effect of the water-cooling plate 54.

[0110] For example Figure 6 and Figure 7As shown, the thermal insulation covering layer 20 can be a plurality of plate-like structures, such as four plate-like structures, and the cross-section of the plate-like structure can be an "L"-shaped structure, wherein the short side of the "L"-shaped structure is an extended flange 21, and the end of the extended flange 21 is chamfered. During actual assembly, the water-cooled plate 54 is first installed above the battery module 200, and then the plurality of "L"-shaped structures are respectively installed on different outer wall surfaces of the frame 11, so that the extended flange 21 can be located above the water-cooled plate 54, and the extended flanges 21 of the four plate-like structures are respectively connected to the four end surfaces of the conformal thermal insulation structure 52, so that the extended flanges 21 of the four plate-like structures and the conformal thermal insulation structure 52 jointly cover the upper side surface of the water-cooled plate 54, so as to enhance the protection effect of the water-cooled plate 54, and at the same time, can enhance the thermal insulation effect of the battery module 200.

[0111] It should be noted that the extended flange 21 and the conformal thermal insulation structure 52 are in the same horizontal plane, so that after the extended flange 21 and the conformal thermal insulation structure 52 are connected, the connection between them is smoother.

[0112] For example Fig.19 As shown, the water-cooling plate assembly 50 includes a water-cooling plate 54 , a conformal thermal insulation structure 52 , a structural adhesive 53 and a thermally conductive structural adhesive 51 .

[0113] The water cooling plate 54 is provided with a flow channel plate, and as Figure 20-22 As shown, the conformal thermal insulation structure 52 is foamed online on the flow channel plate to achieve a conformal design of the conformal thermal insulation structure 52. This design can reduce the space occupancy rate of the conformal thermal insulation structure 52, and a thicker conformal thermal insulation structure 52 can be arranged in the space in the upper and lower directions, thereby improving the thermal insulation capacity.

[0114] For example, the edge of the water-cooling plate 54 is connected to the frame 11 by bonding, riveting or welding. After the connection is completed, the outer side of the frame 11 is provided with a heat-insulating cover layer 20 .

[0115] Among them, the edge area of ​​the water-cooling plate 54 is suitable for bonding with the battery module 200 through the structural adhesive 53 to ensure the structural stability of the water-cooling plate 54. For example, the structural adhesive 53 is suitable for coating the area of ​​the battery module 200 close to the frame 11, and the coating area is 10%-20% of the area of ​​the upper surface of the battery module 200, and the middle area of ​​the water-cooling plate 54 is thermally connected to the battery module 200 by the thermal conductive structural adhesive 51 to facilitate heat exchange between the water-cooling plate 54 and the battery module 200.

[0116] It should be noted that since the edge of the battery module 200 has a better heat dissipation effect than the middle area of ​​the battery module 200, the middle area of ​​the battery module 200 is thermally connected to the water cooling plate 54 to reduce the heat dissipation of the edge of the battery module 200 and improve the heat dissipation of the middle area of ​​the battery module 200, thereby reducing the temperature difference between the edge cells and the middle cells of the battery module 200 and ensuring the thermal balance of the battery module 200.

[0117] Then the insulation covering layer 20 is bonded and covers the outer peripheral wall of the frame 11, and the extended flange 21 of the insulation covering layer 20 is spliced ​​with the conformal insulation structure 52 to form an insulation layer 33 covering except the bottom surface, so that the insulation range of the insulation box structure 100 can be more comprehensive.

[0118] Alternatively, if Fig.18 As shown, thermal insulation cotton 60 may be provided on both sides of the battery module 200. When there are two adjacent battery modules 200, the thickness of the thermal insulation cotton 60 located at the edge is 2-3 times the thickness of the thermal insulation cotton 60 between the two adjacent battery modules 200. According to the difference in the heat dissipation rate at the edge and the middle of the battery module 200, the layout of the thermal insulation cotton 60 is reasonably allocated, so that the battery module 200 has a better thermal insulation effect in a limited space.

[0119] like Figure 1-Figure 5 As shown, the present invention also proposes a battery pack 1000 .

[0120] like Figure 1-Figure 5 As shown, a battery pack 1000 according to an embodiment of the present invention includes: at least one battery module 200 and a box.

[0121] Specifically, the box body is the heat-insulating box body structure 100 of any one of the above-mentioned embodiments, and at least one battery module 200 is disposed in the heat-insulating box body structure 100 .

[0122] According to the battery pack 1000 of the embodiment of the present invention, by providing a thermal insulation covering layer 20 on the outer peripheral wall of the frame 11, the thermal insulation effect of the thermal insulation box structure 100 on the battery module 200 can be enhanced in the circumferential direction of the thermal insulation box structure 100, and by providing a bottom thermal insulation structure 30 between the bottom of the battery module 200 and the bottom guard plate 12, the bottom thermal insulation structure 30 can be used to insulate the battery module 200 below the battery module 200, thereby enhancing the thermal insulation effect of the thermal insulation box structure 100 on the battery module 200.

[0123] In some embodiments, Fig.23As shown, the battery pack 1000 also includes: a first heating film 71 and a second heating film 72. The first heating film 71 is provided on at least one side of the battery module 200 in the first direction, and the second heating film 72 is provided on at least one side of the battery module 200 in the second direction. The first direction and the second direction are perpendicular.

[0124] Thus, the first heating film 71 and the second heating film 72 can heat the battery module 200 in the first direction and the second direction of the battery module 200 respectively.

[0125] Specifically, while the battery module 200 is passively insulated, the thermal insulation box structure 100 also has the problem of edge cooling effect, and under normal circumstances, the temperature of the middle area of ​​the battery module 200 is higher than the edge area of ​​the battery module 200, resulting in a large temperature difference between the middle area and the edge area of ​​the battery module 200, and the existence of the temperature difference will cause the life of the battery module 200 to be reduced.

[0126] Therefore, in the present invention, the first heating film 71 can be set on the inner wall of the insulation box structure 100, so that the first heating film 71 can heat the battery module 200 close to the inner wall of the insulation box structure 100, wherein, since the battery module 200 is arranged inside the insulation box structure 100, the edge area of ​​the battery module 200 is close to the inner wall of the insulation box structure 100, so that the first heating film 71 can heat the edge area of ​​the battery module 200 to reduce the temperature difference between the edge area of ​​the battery module 200 and the middle area of ​​the battery module 200, so that the temperature difference between the middle area and the edge area of ​​the battery module 200 is smaller, that is, the overall temperature of the battery module 200 is more balanced, which is beneficial to extending the service life of the battery module 200.

[0127] Furthermore, if Fig.23 and Fig.24 As shown, two groups of first heating films 71 are provided. In the first direction, the two groups of first heating films 71 are respectively located on two first side walls oppositely arranged in the thermal insulation box structure 100, wherein one group of first heating films 71 includes two first heating films 71, and the two first heating films 71 are respectively attached to the two end areas in the length direction of the first side wall.

[0128] For example, the first direction is the length direction of the battery module 200, and the two groups of first heating films 71 are respectively located on both sides of the length direction of the battery module 200. In this way, the battery module 200 can be heated on both sides of the length direction of the battery module 200 by the two groups of first heating films 71, thereby reducing the temperature difference between the two end areas in the length direction of the battery module 200 and the middle area of ​​the battery module 200, so that the temperature difference between the middle area and the edge area of ​​the battery module 200 is smaller, so that the overall temperature of the battery module 200 is more balanced, which is beneficial to extending the service life of the battery module 200.

[0129] Among them, Fig.24 As shown, a group of first heating films 71 includes two first heating films 71 that are spaced apart, and the two first heating films 71 in the same group are respectively located at the two end areas in the length direction of the first side wall, and the other group is arranged in the same manner on the other first side wall. In this way, the four first heating films 71 can be located at the four corners of the thermal insulation box structure 100, thereby heating the corners of the battery module 200.

[0130] It should be noted that the first heating film 71 can be attached to the first side wall by bonding, so as to enhance the structural stability of the first heating film 71 and reduce the space occupied by the first heating film 71 .

[0131] In this way, the temperature difference between the middle area and the edge area of ​​the battery module 200 is smaller, that is, the overall temperature of the battery module 200 is more balanced, which is beneficial to extending the service life of the battery module 200.

[0132] It should be noted that the edge cooling effect will cause the temperature of the edge portion of the battery module 200 to be lower than the temperature of the central portion. In the first direction, there will also be a temperature difference between the end area and the middle area of ​​the battery module 200. The first heating film 71 is arranged at the two ends of the first side wall to heat the edge portion of the battery module 200 in the first direction, so that the temperature difference between the edge portion and the central portion of the battery module 200 will not be so large, thereby increasing the service life of the battery module 200.

[0133] In some embodiments, the length of the first heating film 71 is 1 / 4-1 / 3 of the length of the battery module 200 , and the width of the first heating film 71 is 1 / 2-2 / 3 of the width of the battery module 200 .

[0134] Therefore, the size of the first heating film 71 will not be too large, and the size of the first heating film 71 can be controlled while ensuring the heating effect of the first heating film 71 on the battery module 200, which is conducive to reducing production costs.

[0135] Preferably, the second heating film 72 is located on the outer peripheral wall of the battery module 200 and is used to heat the battery module 200 .

[0136] Therefore, by arranging the second heating film 72 on the outer peripheral wall of the battery module 200, the battery module 200 can be heated by the second heating film 72 in addition to the heating by the first heating film 71, so that the edge portion of the battery module 200 heats up faster, thereby reducing the temperature difference between the central area and the edge area of ​​the battery module 200 more quickly, so that the overall temperature of the battery module 200 is more balanced, which is beneficial to extending the service life of the battery module 200.

[0137] Furthermore, two second heating films 72 are provided. In the second direction, the two second heating films 72 are respectively attached to two second side walls of the battery module 200 that are opposite to each other.

[0138] For example, the second direction is the width direction of the battery module 200. In this way, the second heating film 72 is respectively attached to the second side walls of the battery module 200 that are relatively arranged in the second direction, so that the second heating film 72 can cooperate with the first heating film 71 on the first side wall, thereby covering the edge portion of the battery module 200 in the circumferential direction of the battery module 200. In this way, the temperature difference between the central area and the edge area of ​​the battery module 200 can be reduced more quickly, so that the overall temperature of the battery module 200 is more balanced, which is beneficial to extending the service life of the battery module 200.

[0139] Preferably, if Fig.25 As shown, the second heating film 72 includes an end heating portion 721 and a middle heating portion 722 , the end heating portion 721 and the middle heating portion 722 are connected via a connecting portion 723 , and the size of the end heating portion 721 is larger than that of the middle heating portion 722 .

[0140] It can be understood that the edge cooling effect of the battery module 200 corresponding to the end heating portion 721 is stronger, and the temperature of this part drops more, so the size of the end heating portion 721 is larger than that of the middle heating portion 722, and the connecting portion 723 connects the end heating portion 721 with the middle heating portion 722, so that the second heating film 72 is more convenient to install on the battery module 200, which helps to reduce the difficulty of installing the second heating film 72.

[0141] For example Fig.25As shown, two battery modules 200 are arranged side by side, and the second heating film 72 is attached to the sides of the two battery modules 200. At this time, the second heating film 72 includes two end heating parts 721 and two middle heating parts 722, and the end heating parts 721 and the middle heating parts 722, and the two middle heating parts 722 are connected by connecting parts 723. Thus, the entire second heating film 72 is an integral structure, which makes it more convenient to install the second heating film 72 on the battery module 200, and helps to reduce the difficulty of installing the second heating film 72.

[0142] In some embodiments, the length of the end heating portion 721 is 1 / 3-1 / 2 of the length of the battery module 200 , the width of the end heating portion 721 is 1 / 2-2 / 3 of the thickness of the battery module 200 , and the width of the middle heating portion 722 is 1 / 4-1 / 3 of the thickness of the battery module 200 .

[0143] As a result, the size setting of the second heating film 72 is more in line with the temperature change of the battery module 200, and the size of the second heating film 72 will not be too large. While ensuring the heating effect of the second heating film 72 on the battery module 200, the size of the second heating film 72 can be controlled, which is conducive to reducing production costs.

[0144] In some embodiments, the first direction is perpendicular to the second direction, so that the first heating film 71 and the second heating film 72 can heat the battery module 200 at the circumferential outer side of the battery module 200 .

[0145] In some embodiments, the battery pack 1000 further includes: a first temperature sensor and a second temperature sensor.

[0146] The first temperature sensor is suitable for detecting the temperature of the middle area of ​​the battery module 200 , and the second temperature sensor is suitable for detecting the temperature of the edge area of ​​the battery module 200 .

[0147] Specifically, the first temperature sensor detects the temperature of the middle area of ​​the battery module 200, and the second temperature sensor detects the temperature of the edge area of ​​the battery module 200. The temperatures detected by the first temperature sensor and the second temperature sensor are compared to determine the temperature difference between the middle area and the edge area of ​​the battery module 200. The difference between the first temperature sensor and the second temperature sensor can be used to accurately control the first heating film 71 and the second heating film 72.

[0148] It should be noted that the temperature sensors in the battery pack 1000 are not limited to the first temperature sensor and the second temperature sensor. More temperature sensors may be provided in the battery pack 1000 to make temperature monitoring more accurate.

[0149] The present invention also provides a control method for the battery pack 1000 .

[0150] According to the control method of the battery pack 1000 of the embodiment of the present invention, the control method is applied to the battery pack 1000 in the above embodiment, and as Fig.26 As shown, the control method includes:

[0151] S10: within a first set time, obtaining a first temperature difference between a first temperature sense and a second temperature sense and obtaining a cooling rate of the second temperature sense.

[0152] S20: When the first temperature difference is greater than the first set temperature and the cooling rate of the second temperature sense is greater than the first set rate, the first heating film and / or the second heating film is controlled to heat the battery module 200 at the first set power.

[0153] S30: When the first temperature difference is greater than the first set temperature and the cooling rate of the second temperature sense is less than the first set rate, the first heating film and / or the second heating film are controlled to heat the battery module 200 at the second set power.

[0154] For example, the first set time may be within the previous 4 hours, the first set temperature may be 5° C., the first set power may be P1, the second set power may be P2, and the first set rate may be 4° C. / h.

[0155] That is, within the first 4 hours, when the first temperature difference between the first temperature sense and the second temperature sense is greater than 5°C and the cooling rate of the second temperature sense is greater than 4°C / h, the first heating film and / or the second heating film is controlled to heat the battery module 200 at a power of P1, wherein P1 satisfies: 20W≤P1≤25W.

[0156] Or when the first temperature difference between the first temperature sense and the second temperature sense is greater than 5°C and the cooling rate of the second temperature sense is less than 4°C / h, the first heating film and / or the second heating film are controlled to heat the battery module 200 at a power of P2, wherein P2 satisfies: 10W≤P2≤15W.

[0157] It should be noted that when the cooling rate of the second temperature sense is greater than 4°C / h, the heating power P1 is relatively high, which can make the temperature of the edge portion of the battery module 200 rise more quickly, and can make the temperature of the edge portion of the battery module 200 close to the temperature of the middle portion as soon as possible, thereby increasing the service life of the battery module 200. When the cooling rate of the second temperature sense is less than 4°C / h, the heating power P2 is relatively low. On the one hand, it can achieve heating of the edge area of ​​the battery module 200, and on the other hand, it can save electricity.

[0158] In some embodiments, Fig. 27 As shown, the control method also includes:

[0159] S40: obtaining a cooling rate of the second temperature sense and a second temperature difference between the first temperature sense and the second temperature sense within a second set time;

[0160] S50: when the cooling rate of the second temperature sense is greater than the second set rate and the second temperature difference is greater than the second set temperature, controlling the first heating film 71 and / or the second heating film 72 to heat the battery module 200 at a third set power;

[0161] S60: When the cooling rate of the second temperature sense is greater than the second set rate and the second temperature difference is less than the second set temperature, the first heating film 71 and / or the second heating film 72 is controlled to heat the battery module 200 at a fourth set power.

[0162] For example, the second set time may be after 4 hours, the second set rate may be 3°C / h, the third set power may be P3, the fourth set power may be P4, and the second set temperature may be 5°C.

[0163] That is, when the cooling rate of the second temperature sense is greater than 3°C / h and the second temperature difference is greater than 5°C, the first heating film 71 and / or the second heating film 72 are controlled to heat the battery module 200 at the power of P3, and P3 satisfies: 10W≤P1≤15W;

[0164] Or when the cooling rate of the second temperature sense is greater than 3°C / h and the second temperature difference is less than 5°C, the first heating film 71 and / or the second heating film 72 are controlled to heat the battery module 200 at the power of P4, and P4 satisfies: 20W≤P4≤25W;

[0165] It should be noted that when the second temperature difference is greater than 5°C, the heating power P3 is relatively small. Because the temperature difference between the middle area and the edge area of ​​the battery module 200 is relatively large, a smaller heating power can make the temperature difference between the middle area and the edge area of ​​the battery module 200 rise more slowly, thereby protecting the battery module 200 and increasing the life of the battery module 200. When the second temperature difference is less than 5°C, the heating power P4 is relatively large, and the temperature difference between the middle area and the edge area of ​​the battery module 200 is relatively small. A larger heating power can make the temperature of the battery module 200 rise faster, so that the temperature of the edge area can be restored to the temperature of the middle area as soon as possible, thereby improving the overall service life of the battery module 200.

[0166] In some embodiments, Fig.28 As shown, the control method also includes:

[0167] S70 : When the cooling rate of the second temperature sensor is less than or equal to the third set rate, the first heating film 71 and / or the second heating film 72 is controlled to stop heating the battery module 200 .

[0168] For example, the third set rate may be 2°C / h. When the cooling rate of the second temperature sensor is less than or equal to 2°C / h, the first heating film 71 and the second heating film 72 are controlled to stop heating the battery module 200, thereby avoiding overheating.

[0169] According to the control method of the battery pack 1000 of the embodiment of the present invention, the use of this control method can enhance the thermal insulation effect of the thermal insulation box structure 100, reduce the temperature difference between the middle area and the edge area of ​​the battery module 200, reduce the energy consumption of the battery module 200, and increase the use time and service life of the battery module 200.

[0170] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0171] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0172] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0173] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0174] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0175] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat preservation box structure, characterized in that: include: A lower housing assembly, the lower housing assembly comprising a frame and a bottom guard plate, the frame being connected to the bottom guard plate and defining an installation cavity for installing a battery module; A thermal insulation covering layer, the thermal insulation covering layer covering the outer peripheral wall of the frame; A bottom insulation structure, the bottom insulation structure is installed in the installation cavity, and the bottom insulation structure is located at the bottom of the battery module and connected to one side of the bottom guard plate; The bottom insulation structure comprises a first plate and a second plate, wherein the first plate is suitable for being connected to the bottom of the battery module, and the second plate is connected to the side of the bottom guard plate in a bonded manner, and an insulation layer is sandwiched between the first plate and the second plate; The bottom insulation structure further comprises: a reinforcing rib plate, the reinforcing rib plate being sandwiched between the first plate and the second plate, and the insulation layer being suitable for being filled in a filling cavity of the reinforcing rib plate; At least two thermal insulation beam assemblies, the thermal insulation beam assemblies are installed in the installation cavity, and an installation space is defined between two adjacent thermal insulation beam assemblies, the battery module is located in the installation space and the two sides are attached to the two thermal insulation beam assemblies; Wherein, the insulation beam assembly comprises a pultruded profile beam and two mounting seats, the two mounting seats are respectively connected to two oppositely distributed inner walls of the mounting cavity, and the pultruded profile beam is connected between the two mounting seats; It also includes: a water-cooling plate assembly, the water-cooling plate assembly including a water-cooling plate and a conformal thermal insulation structure, the water-cooling plate is installed on the upper side of the battery module, and the conformal thermal insulation structure is coated on the upper side of the water-cooling plate; The thermal insulation covering layer is provided with an extended flange, which extends to the side of the water cooling plate away from the battery module, and the extended flange is in contact with the side of the water cooling plate away from the battery module and is connected to the conformal thermal insulation structure.

2. A battery pack, characterized in that: include: at least one battery module; The box body is the heat-insulating box body structure according to claim 1, and at least one of the battery modules is arranged in the heat-insulating box body structure.

3. The battery pack according to claim 2, characterized in that: Also includes: A first heating film and a second heating film, the first heating film is provided on at least one side of the battery module in a first direction, and the second heating film is provided on at least one side of the battery module in a second direction, and the first direction is perpendicular to the second direction.

4. The battery pack according to claim 3, characterized in that: Also includes: A first temperature sensor and a second temperature sensor, wherein the first temperature sensor is suitable for detecting the temperature of a middle area of ​​the battery module, and the second temperature sensor is suitable for detecting the temperature of an edge area of ​​the battery module.

5. A control method for a battery pack, characterized in that: The control method is applied to the battery pack according to claim 4, and the control method includes: Within a first set time, obtaining a first temperature difference between a first temperature sense and a second temperature sense and obtaining a cooling rate of the second temperature sense; When the first temperature difference is greater than a first set temperature and the cooling rate of the second temperature sensor is greater than the first set rate, controlling the first heating film and / or the second heating film to heat the battery module at a first set power; When the first temperature difference is greater than the first set temperature and the cooling rate of the second temperature sensor is less than the first set rate, the first heating film and / or the second heating film is controlled to heat the battery module at a second set power.

6. The control method for a battery pack according to claim 5, characterized in that: The control method further comprises: Within a second set time, obtaining a cooling rate of the second temperature sense and obtaining a second temperature difference between the first temperature sense and the second temperature sense; When the cooling rate of the second temperature sensor is greater than a second set rate and the second temperature difference is greater than a second set temperature, controlling the first heating film and / or the second heating film to heat the battery module at a third set power; When the cooling rate of the second temperature sensor is greater than the second set rate and the second temperature difference is less than the second set temperature, the first heating film and / or the second heating film is controlled to heat the battery module at a fourth set power.

7. The control method for a battery pack according to claim 6, characterized in that: The control method further comprises: When the cooling rate of the second temperature sensor is less than or equal to a third set rate, the first heating film and / or the second heating film is controlled to stop heating the battery module.

Images