Battery device and electric equipment

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery device and electric equipment. The battery device comprises a box body, a battery monomer assembly, a heat management assembly and a liquid cooling plate, the battery monomer assembly is arranged in the box body, the battery monomer assembly comprises a plurality of battery monomers, each battery monomer is provided with a top end wall and a bottom end wall which are opposite to each other, the liquid cooling plate abuts against the bottom end wall, and the heat management assembly comprises a first heat management structure; the first heat management structure is arranged between the side wall of the battery monomer assembly and the inner side wall of the box body, the first heat management structure comprises a first heat conduction layer, a first temperature control layer and a first heat insulation layer which are sequentially stacked, the first heat conduction layer abuts against the battery monomer assembly, the first heat insulation layer abuts against the inner side wall of the box body, and the first temperature control layer comprises a phase change material. By applying the technical scheme of the invention, the problem that the charging and discharging working cycle and the service life of the single battery are influenced due to lithium precipitation of the single battery when the battery device is used outdoors in cold weather is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery device, and particularly relates to a battery device and an electric equipment. BACKGROUND

[0002] At present, most battery devices need to be used outdoors for a long time, and thus the battery devices are sensitive to temperature difference of external environment. In particular, in cold winter, the battery device usually needs to have the ability to resist extremely cold weather. The extremely cold weather can cause lithium precipitation of the battery monomer in the battery device, and further affect the charge-discharge cycle performance and service life of the battery monomer. CONTENT OF THE INVENTION

[0003] The application aims to provide a battery device and an electric equipment, and aims to solve the problems of poor charge-discharge cycle performance and short service life of the battery monomer when the battery device is used outdoors in cold weather.

[0004] In order to achieve the above-mentioned purpose, according to the first aspect of the embodiment of the application, a battery device is provided, which comprises a box body, a battery monomer assembly and a thermal management assembly. The battery monomer assembly is arranged in the box body. The thermal management assembly comprises a first thermal management structure. The first thermal management structure is arranged between the battery monomer assembly and the inner side wall of the box body. In the direction from the battery monomer assembly to the inner side wall of the box body, the first thermal management structure comprises a first heat conduction layer, a first temperature control layer and a first heat insulation layer which are sequentially stacked. The first heat conduction layer abuts against at least part of the outer wall of the battery monomer assembly. The first heat insulation layer abuts against the inner side wall of the box body. The first temperature control layer comprises a phase change material.

[0005] In the battery device provided by the embodiments of the present application, during the charging and discharging of the battery cell assembly, the heat generated by the battery cell assembly is quickly transferred to the first temperature control layer by the first heat conduction layer. Since the first temperature control layer comprises a phase change material, the first temperature control layer absorbs and stores the heat. In this way, the battery cell assembly is quickly cooled during the charging and discharging of the battery cell assembly, so as to help the battery cell assembly to remain in a normal working temperature range. At the same time, the first thermal insulation layer blocks the low temperature of the external environment, reducing the influence of the low temperature of the external environment on the battery cell assembly. When the battery cell assembly stops charging and discharging, i.e. when the battery device is in an idle state, the heat stored in the first temperature control layer is released to the battery cell assembly, so as to achieve heat preservation of the battery cell assembly, reduce the possibility of lithium precipitation due to low temperature, and the first thermal insulation layer reduces the heat transfer of the first temperature control layer to the external environment through the box, further improves the heat preservation effect of the first thermal management structure on the battery cell assembly, and further reduces the possibility of lithium precipitation due to low temperature. Through the heat dissipation and heat preservation of the first thermal management structure on the battery cell assembly, especially the heat preservation in the winter climate reaching minus Celsius, the influence of cold climate on the electrical performance of the battery cell assembly can be reduced, thereby prolonging the service life of the battery device.

[0006] In some embodiments, the battery cell assembly comprises a plurality of battery cells arranged along a first direction, the battery cells having opposite top end walls and bottom end walls, the top end walls being provided with pressure relief mechanisms, and the battery device further comprises a liquid cooling plate arranged between the box and the bottom end walls, the liquid cooling plate abutting the bottom end walls, and a first thermal management structure being arranged between the side walls of the battery cell assembly and the inner side walls of the box. Further, the first thermal management structure is arranged between the top end walls and the inner side walls of the box, at least part of the top end walls abutting the first heat conduction layer, and the pressure relief mechanisms and the first thermal management structure having a spacing therebetween. The liquid cooling plate and the first thermal management structure jointly absorb heat from the battery cells, thereby quickly cooling the battery cells, so that the battery cells can remain in a normal working temperature range.

[0007] In some embodiments, the first thermal management structure further comprises a first heat dissipation device, the first heat dissipation device being embedded in the first temperature control layer, the first heat dissipation device being connected to the box or the liquid cooling plate, and the first heat dissipation device being used for dissipating heat from the first temperature control layer. Through the embedded first heat dissipation device, the heat of the first temperature control layer can be conducted away, so that the phase change material of the first temperature control layer can always absorb the heat of the battery cells, thereby quickly cooling the battery cells.

[0008] In some embodiments, the first heat dissipation device comprises heat dissipation fins, the ends of the heat dissipation fins extending out of the first temperature control layer, and the heat dissipation fins being used for releasing the heat of the first temperature control layer.

[0009] In some embodiments, the first heat dissipation device comprises a heat pipe, an end of the heat pipe extends out of the first temperature control layer, and the heat pipe is used to release heat of the first temperature control layer.

[0010] In some embodiments, the thermal management assembly further comprises a plurality of second thermal management structures, one second thermal management structure is arranged between two adjacent battery monomers in one battery monomer assembly, the second thermal management structure comprises two layers of second heat conduction layers and a second temperature control layer arranged between the two layers of second heat conduction layers, the two layers of second heat conduction layers abut the side walls of the two adjacent battery monomers respectively, and the second temperature control layer comprises a phase change material. While the liquid cooling plate and the first thermal management structure rapidly conduct heat away from the small side walls and the bottom end walls of the battery monomers, the second thermal management structure also rapidly conducts heat away from the large side walls of the battery monomers, further improving the ability to rapidly dissipate heat generated by the battery monomers.

[0011] In some embodiments, the battery device comprises a plurality of battery monomer assemblies, the plurality of battery monomer assemblies are distributed along a second direction, so that the plurality of battery monomers are distributed in a rectangular array, which can improve the endurance of the battery device. The second direction is perpendicular to the first direction, and the plurality of second thermal management structures between two adjacent columns of battery monomers along the second direction are sequentially connected to form an integrated structure. In this way, the number of second thermal management structures is reduced, which can reduce the storage cost, transportation cost, etc. of the second thermal management structures, thereby reducing the overall production cost of the battery device.

[0012] In some embodiments, the second thermal management structure further comprises a second thermal insulation layer, the second temperature control layer comprises a first phase change temperature control sub-layer and a second phase change temperature control sub-layer, and the first phase change temperature control sub-layer, the second thermal insulation layer, and the second phase change temperature control sub-layer are sequentially stacked. By arranging the second thermal insulation layer in the second thermal management structure, the heat blocking ability of the second thermal management structure between the two adjacent battery monomers is further improved, thereby further reducing the degree of thermal interference between the two adjacent battery monomers.

[0013] In some embodiments, the second thermal management structure further comprises a second heat dissipation device, the second heat dissipation device is embedded in the second temperature control layer, the second heat dissipation device is connected to the box or the liquid cooling plate, and the second heat dissipation device is used to dissipate heat of the second temperature control layer. Through the embedded second heat dissipation device, the heat of the second temperature control layer can be conducted away, so that the phase change material of the second temperature control layer can always absorb the heat of the battery monomers, thereby enabling the battery monomers to achieve more rapid heat dissipation and cooling.

[0014] In some embodiments, the second heat dissipation device comprises a heat dissipation fin, an end of the heat dissipation fin extends out of the second temperature control layer, and the heat dissipation fin is used to release heat of the second temperature control layer.

[0015] In some embodiments, the second heat dissipation device comprises a heat pipe, an end of the heat pipe extends out of the second temperature control layer, and the heat pipe is used to release heat of the second temperature control layer.

[0016] In some embodiments, the first thermally conductive layer and / or the second thermally conductive layer comprises a thermally conductive glue, which is cured and shaped.

[0017] In some embodiments, the first thermal insulation layer and / or the second thermal insulation layer comprises at least one of aerogel, polyurethane, phenol formaldehyde resin foam.

[0018] According to a second aspect of the embodiments of the present application, a battery device is provided. The battery device comprises a battery cell and a battery management system, the battery management system comprises a battery management circuit and a thermal management assembly, the battery management circuit is electrically connected to the battery cell, and the thermal management assembly is thermally connected to the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0020] Figure 1 An exploded view of a battery device according to an embodiment of the present application;

[0021] Figure 2 An exploded view of another battery device according to an embodiment of the present application;

[0022] Figure 3 A structural view of a battery cell in a battery device according to an embodiment of the present application;

[0023] Figure 4 A sectional view of a first thermal management structure of a thermal management assembly in a battery device according to an embodiment of the present application;

[0024] Figure 5 A sectional view of another first thermal management structure of a thermal management assembly in a battery device according to an embodiment of the present application;

[0025] Figure 6 A sectional view of a second thermal management structure of a thermal management assembly in a battery device according to an embodiment of the present application;

[0026] Figure 7 A sectional view of another second thermal management structure of a thermal management assembly in a battery device according to an embodiment of the present application;

[0027] Figure 8 A sectional view of yet another second thermal management structure of a thermal management assembly in a battery device according to an embodiment of the present application;

[0028] Figure 9A cross-sectional view of a second heat management structure of a heat management component in a battery device of an embodiment of the present application;

[0029] Figure 10 A structural schematic diagram of an electrical equipment of an embodiment of the present application.

[0030] In the drawings, the same or similar reference signs denote the same or similar components throughout the drawings.

[0031] 100, battery cell; 101, battery cell assembly; 102, top end wall; 103, bottom end wall; 104, large side wall; 105, small side wall; 106, pressure relief mechanism; 107, pole structure;

[0032] 10, heat management component; 11, first heat management structure; 111, first heat conduction layer; 112, first temperature control layer; 113, first thermal insulation layer; 114, first heat dissipation device; 12, second heat management structure; 121, second heat conduction layer; 122, second temperature control layer; 1221, first phase change temperature control sub-layer; 1222, second phase change temperature control sub-layer; 123, second thermal insulation layer; 124, second heat dissipation device;

[0033] 20, liquid cooling plate;

[0034] 200, battery device; 210, box; 201, box body; 202, box cover; 203, assembly space;

[0035] 400, electrical equipment; 410, electrical load; 420, control device; 430, vehicle frame; 440, vehicle wheel. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] In addition, the terms "first", "second", and the like are used only for descriptive purposes, and do not denote or imply relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" and the like can include one or more of the features implicitly or explicitly. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station (the battery device of this kind of application is generally called energy storage battery), but also is widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles (the battery device of this kind of application is generally called power battery). With the continuous expansion of the application field of battery device, the quality requirements of users for battery device are also continuously improved, including but not limited to the requirements of improving the endurance and prolonging the service life.

[0041] In the related art, the battery device includes at least one battery monomer assembly. The battery monomer assembly generates heat during the charging and discharging work, which increases the temperature of the battery monomer assembly, and then affects the electrical performance of the battery monomer assembly.

[0042] In addition, most of the battery devices need to be used outdoors for a long time, so the battery device is more sensitive to the temperature difference of the external environment, especially in cold winter. Since the battery device is usually used outdoors, especially in the north, it is required that the battery device usually needs to have the ability to resist extremely cold weather. Extremely cold weather can cause lithium precipitation in the battery monomer of the battery device, thereby affecting the charging and discharging work cycle and service life of the battery monomer.

[0043] Based on the above considerations, the embodiments of the present application provide a battery device, in which a first thermal management structure is arranged between the battery monomer assembly and the inner side wall of the box body, and the first thermal management structure comprises a first heat conduction layer, a first temperature control layer and a first thermal insulation layer which are sequentially stacked, wherein the first temperature control layer comprises a phase change material. In this way, during the charging and discharging work of the battery monomer assembly, the heat generated by the battery monomer assembly is quickly transferred to the first temperature control layer by the first heat conduction layer, and since the first temperature control layer comprises a phase change material, the first temperature control layer absorbs and stores heat. In this way, the battery monomer assembly is quickly cooled and cooled during the charging and discharging work of the battery monomer assembly, thereby facilitating the battery monomer assembly to remain within a normal working temperature range, and the first thermal insulation layer blocks the low temperature of the external environment, reducing the influence of the low temperature of the external environment on the battery monomer assembly. And when the battery monomer assembly stops charging and discharging work, that is, when the battery device is in an idle state, the heat stored in the first temperature control layer will be released to the battery monomer assembly, thereby achieving heat preservation of the battery monomer assembly, reducing the possibility of lithium precipitation due to low temperature, and the first thermal insulation layer reduces the heat of the first temperature control layer transmitted to the external environment through the box body, further improving the heat preservation effect of the first thermal management structure on the battery monomer assembly, and further reducing the possibility of lithium precipitation due to low temperature. Through the heat dissipation and heat preservation effects of the first thermal management structure on the battery monomer assembly, especially the heat preservation effect in winter climate reaching minus Celsius, the influence of cold climate on the electrical performance of the battery monomer assembly can be reduced, thereby prolonging the service life of the battery device.

[0044] In order to illustrate the technical solutions provided by the embodiments of the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0045] For example, as shown in Figure 1 and Figure 2 , the X axis shown therein represents the first direction, the Y axis represents the second direction, and the Z axis represents the third direction, wherein the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0046] According to a first aspect of the embodiments of the present application, the embodiments of the present application provide a battery device 200. As shown in Figures 1 to 4As shown, the battery device 200 includes a box body 210, a battery monomer assembly 101 arranged in the box body 210, and a thermal management assembly 10 including a first thermal management structure 11 arranged between the battery monomer assembly 101 and an inner side wall of the box body 210. The first thermal management structure 11 includes, in the direction from the battery monomer assembly 101 to the inner side wall of the box body 210, a first thermal conductive layer 111, a first temperature control layer 112, and a first thermal insulation layer 113 arranged in sequence. The first thermal conductive layer 111 abuts at least part of an outer wall of the battery monomer assembly 101. The first thermal insulation layer 113 abuts the inner side wall of the box body 210. The first temperature control layer 112 includes a phase change material.

[0047] In the battery device 200 provided in the embodiments of the present application, during the charging and discharging of the battery monomer assembly 101, the heat generated by the battery monomer assembly 101 is quickly transferred to the first temperature control layer 112 by the first thermal conductive layer 111. Since the first temperature control layer 112 includes a phase change material, the first temperature control layer 112 absorbs and stores the heat. In this way, the battery monomer assembly 101 is quickly cooled during the charging and discharging of the battery monomer assembly 101, so as to help the battery monomer assembly 101 to be kept in a normal working temperature range. Meanwhile, the first thermal insulation layer 113 blocks the low temperature of the external environment, so as to reduce the influence of the low temperature of the external environment on the battery monomer assembly 101. When the charging and discharging of the battery monomer assembly 101 is stopped, i.e., when the battery device 200 is in an idle state, the heat stored in the first temperature control layer 112 is released to the battery monomer assembly 101, so as to keep the battery monomer assembly 101 warm, and reduce the possibility of lithium precipitation due to low temperature. The first thermal insulation layer 113 reduces the heat of the first temperature control layer 112 transferred to the external environment through the box body 210, so as to further improve the heat preservation effect of the first thermal management structure 11 on the battery monomer assembly 101, and further reduce the possibility of lithium precipitation due to low temperature. Through the heat dissipation and heat preservation effects of the first thermal management structure 11 on the battery monomer assembly 101, especially the heat preservation effect in the winter climate reaching minus Celsius degrees, the influence of the cold climate on the electrical performance of the battery monomer assembly 101 can be reduced, so as to prolong the service life of the battery device 200.

[0048] In some embodiments, the phase change material included in the first temperature control layer 112 of the first thermal management structure 11 can be a phase change material that can be transformed between solid phase and liquid phase, i.e., the phase change material is transformed from solid phase to liquid phase when absorbing heat. In the present embodiment, the circumferential edge of the first thermal conductive layer 111 is connected and sealed with the circumferential edge of the first thermal insulation layer 113, so as to encapsulate the phase change material of the first temperature control layer 112. In this way, the phase change material will not leak when being transformed from solid phase to liquid phase.

[0049] In other embodiments, the phase change material can be a solid-solid phase change material. The solid-solid phase change material always keeps macro solid state during the heat absorption / heat release process, and stores / releases latent heat by means of crystal structure transition (or crystalline-amorphous transition), completely avoiding the leakage and packaging difficulties caused by solid-liquid phase transition. During the heat absorption / heat release process, when the temperature rises to the phase change point, the phase change component inside the material reversibly changes from "crystalline state amorphous state" or "crystal form I crystal form II", absorbs / releases a large amount of latent heat, while the solid-solid phase change material as a whole still maintains the appearance of solid state, that is, the volume change of the solid-solid phase change material during the transition process is very small (<1%), and no liquid state appears during the transition process of the solid-solid phase change material. Therefore, the solid-solid phase change material does not need to be sealed by metal or high strength. The solid-solid phase change material includes but is not limited to paraffin, fatty acid, hydrated salt (alkali), nitrate mixture and the like phase change materials.

[0050] In some embodiments, as shown in Figure 1 and Figure 2 , the battery cell assembly 101 includes a plurality of battery cells 100 arranged along a first direction X. The battery cell 100 can be a secondary battery, which refers to a battery cell 100 that can be activated by charging after discharging. The battery cell 100 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto. In addition, the battery cell 100 can be square, also known as a square cell. As shown in Figure 3 , the square battery cell 100 has two large side walls 104 with large surface area, two small side walls 105 with small surface area, a bottom end wall 103 and a top end wall 102. The two large side walls 104 and the two small side walls 105 are alternately connected to form a prismatic side wall, and the bottom end wall 103 and the top end wall 102 are respectively located at the upper and lower ends of the prismatic side wall. Generally, the top end wall 102 is provided with a pressure relief mechanism 106 and a pole structure 107, etc., so that the top end wall 102 can be easily determined, and the wall opposite to the top end wall 102 is the bottom end wall 103. For the two large side walls 104 and the two small side walls 105, they can be directly distinguished by the surface area of the side wall. The battery device 200 assembled by the square battery cell 100 is also square in shape, also known as a square battery. In addition, as shown in Figure 1 and Figure 2As shown, the square battery device 200 further comprises a liquid cooling plate 20, which is arranged between the box 210 and the bottom end wall 103 and abuts against the bottom end wall 103. The first thermal management structure 11 is arranged between the outer wall of the battery monomer assembly 101 and the inner side wall of the box 210, i.e. between the large side wall 104 of the inner side wall of the box 210 and the battery monomer assembly 101 facing the large side wall 104, between the corresponding small side wall 105 of the inner side wall of the box 210 and the battery monomer assembly 101 facing the small side wall 105, and between each top end wall 102 of the battery monomer assembly 101 and the inner side wall of the box 210. At least part of the top end wall 102 abuts against the first thermal conductive layer 111, and the pressure relief mechanism 106 is spaced apart from the first thermal management structure 11. When the battery device 200 is working, i.e. each battery monomer 100 is working in charging and discharging, the battery monomer 100 generates heat, the liquid cooling plate 20 absorbs the heat of the battery monomer 100 from the bottom end wall 103, and the first thermal conductive layer 111 of the first thermal management structure 11 transmits the heat of the corresponding battery monomer 100 to the first temperature control layer 112, so that the liquid cooling plate 20 and the first thermal management structure 11 jointly absorb the heat of the battery monomer 100, thereby rapidly dissipating and cooling the battery monomer 100, so that the battery monomer 100 can be kept in the normal working temperature range. Moreover, the phase change material of the first temperature control layer 112 absorbs and stores heat, and the cooling liquid in the liquid cooling plate 20 also stores a certain degree of heat. When the battery monomer 100 stops working in charging and discharging, the heat stored in the first temperature control layer 112 is released to the battery monomer 100, and the heat stored in the cooling liquid in the liquid cooling plate 20 is also released to the battery monomer 100, thereby achieving heat preservation of the battery monomer 100. Moreover, the first thermal insulation layer 113 of the first thermal management structure 11 reduces the heat of the first temperature control layer 112 transmitted to the external environment through the box 210, further improving the heat preservation effect of the first thermal management structure 11 on the battery monomer assembly 101.

[0051] As Figure 5As shown, in some embodiments, the first thermal management structure 11 further comprises a first heat dissipation device 114, the first heat dissipation device 114 is embedded in the first temperature control layer 112, the first heat dissipation device 114 is connected to the box 210 or the liquid cooling plate 20, and the first heat dissipation device 114 is used to dissipate heat of the first temperature control layer 112. When the battery device 200 works for a long time, if the phase change material in the first temperature control layer 112 stores enough heat, the temperature of the first temperature control layer 112 rises to the temperature of the battery monomer 100, and then the phase change material in the first temperature control layer 112 cannot continue to store heat. Therefore, the embedded first heat dissipation device 114 can guide the heat of the first temperature control layer 112 away, so that the phase change material in the first temperature control layer 112 can always absorb the heat of the battery monomer 100, so that the battery monomer 100 can realize rapid heat dissipation and cooling, and the battery monomer 100 can be kept in the normal working temperature range.

[0052] In some embodiments, the first heat dissipation device 114 comprises a heat dissipation fin, and the end of the heat dissipation fin extends out of the first temperature control layer 112. The end of the heat dissipation fin can be connected to the box 210, so that the heat dissipation fin guides the heat of the first temperature control layer 112 to the box 210, and the heat is radiated to the external environment through the box 210, thereby guiding the heat of the first temperature control layer 112 away. Alternatively, the end of the heat dissipation fin can be connected to the liquid cooling plate 20, so that the heat dissipation fin guides the heat of the first temperature control layer 112 to the liquid cooling plate 20, and the cooling liquid flowing in the liquid cooling plate 20 carries away the heat, thereby realizing the release of heat of the first temperature control layer 112.

[0053] In some embodiments, the first heat dissipation device 114 comprises a heat pipe, an end of the heat pipe extends out of the first temperature control layer 112, and the end of the heat pipe is connected to the case 210 or the liquid cooling plate 20 to release the heat of the heat pipe, i.e., to release the heat of the first temperature control layer 112. The heat pipe is a kind of high-efficiency heat transfer element, which realizes efficient and non-power-consumption directional heat transfer. The working principle of the heat pipe is based on phase change heat transfer and capillary action. The heat pipe is usually composed of a pipe shell, a wick (porous capillary structure), and a working fluid. The pipe shell is a sealed metal pipe (such as copper or aluminum), which is vacuumized inside and then filled with a small amount of working fluid (water, ammonia, sodium, etc.). The wick is a porous material (such as metal mesh or sintered powder) close to the pipe wall, which provides capillary force. The working temperature is selected according to the working fluid (ammonia for low temperature, water for medium temperature, and sodium for high temperature). Generally, one end of the heat pipe contacts a heat source, and the heat is transferred through the pipe wall. The liquid working fluid in the wick absorbs the heat and vaporizes. The partial vapor pressure rises, and the high-pressure vapor diffuses to the other end (condensation section) and carries the latent heat of vaporization. The steam releases the latent heat and re-condenses into liquid in the condensation section, and the heat is transferred to the external heat sink through the pipe wall. The condensed liquid is pulled back to the evaporation section by the capillary force of the wick, forming a cycle. That is, the heat pipe guides the heat of the first temperature control layer 112 to the case 210 or the liquid cooling plate 20, and then the case 210 or the liquid cooling plate dissipates the heat, thereby releasing the heat of the first temperature control layer 112.

[0054] As Figure 1 , Figure 2 and Figure 6As shown, in some embodiments, the thermal management component 10 further includes multiple second thermal management structures 12. In a battery cell assembly 101, a second thermal management structure 12 is provided between two adjacent battery cells 100. The second thermal management structure 12 includes two second thermally conductive layers 121 and a second temperature-controlling layer 122 disposed between the two second thermally conductive layers 121. The two second thermally conductive layers 121 respectively abut against the sidewalls of the two adjacent battery cells 100, that is, the two second thermally conductive layers 121 respectively abut against the two large sidewalls 104 of the two adjacent battery cells 100. Furthermore, the second temperature-controlling layer 122 includes a phase change material. In a battery cell assembly 101, the second thermal management structure 12 blocks the heat generated by the two adjacent battery cells 100 during charging and discharging, thereby reducing the degree of thermal interference between the two adjacent battery cells 100. While the liquid cooling plate 20 and the first thermal management structure 11 rapidly conduct heat away from the small sidewall 105 and bottom wall 103 of the battery cell 100, the second thermal management structure 12 also rapidly conducts heat away from the large sidewall 104 of the battery cell 100, further improving the ability to quickly dissipate heat generated by the battery cell 100. Furthermore, while the coolant from the first thermal management structure 11 and the liquid cooling plate 20 releases heat to the battery cell 100 for insulation, the heat stored in the phase change material of the second thermal management structure 12 can also release heat to the battery cell 100, achieving the effect of insulation. During charging and discharging, the battery cell 100 undergoes expansion and deformation, primarily manifested on the large sidewall 104; that is, the expansion and deformation of the large sidewall 104 is greater than that of the small sidewall 105, top wall 102, and bottom wall 103. A second thermal management structure 12 is sandwiched between two connected battery cells 100 in the battery cell assembly 101. The second thermal management structure 12 is subjected to compressive force. Since the second thermal management structure 12 basically covers and abuts the entire large sidewall 104, the interaction force between the second thermal management structure 12 and the large sidewall 104 of the battery cell 100 is evenly distributed. In this way, the second thermal management structure 12 can better withstand and offset the expansion stress of the battery cell 100 when it expands and deforms, reducing the risk of the battery cell 100 cracking due to expansion and deformation, resulting in electrolyte leakage and failure.

[0055] In some embodiments, such as Figure 2 As shown, the battery device 200 includes a plurality of battery cell assemblies 101, which are distributed along the second direction Y so that the plurality of battery cells 100 are arranged in a rectangular array.

[0056] For example, such as Figure 1 and Figure 2As shown, in each battery cell assembly 101, two large side walls 104 are arranged opposite to each other between two adjacent battery cells 100. Of course, in other embodiments, still taking the space rectangular coordinate system composed of the first direction X, the second direction Y and the third direction Z as a reference, the plurality of battery cells 100 of the battery cell assembly 101 can be arranged along the second direction Y, that is, in the battery cell assembly 101, two small side walls 105 are arranged opposite to each other between two adjacent battery cells 100. The following description takes the example that the plurality of battery cells 100 are arranged along the first direction X to form the battery cell assembly 101, that is, in the battery cell assembly 101, two large side walls 104 are arranged opposite to each other between two adjacent battery cells 100. And this example can be taken as a reference for other embodiments.

[0057] As shown in FIG. 1, the battery device 200 includes a plurality of battery cell assemblies 101, a plurality of battery cell assemblies 101 are arranged in the second direction Y, that is, the plurality of battery cell assemblies 101 are arranged in the second direction Y to form the battery device 200. Figure 1 And Figure 2 As shown, the box 210 includes a box body 201 and a box cover 202, the box cover 202 covers the open end of the box body 201, and the box body 201 and the box cover 202 cover to form an assembly space 203. The plurality of battery cell assemblies 101 are arranged in the second direction Y in the assembly space 203, that is, the plurality of battery cells 100 are arranged in the assembly space 203 in an array distribution, thereby being assembled and formed into a square battery. In each battery cell assembly 101, the plurality of battery cells 100 are connected in series, parallel or mixed connection through the busbar, and the plurality of battery cell assemblies 101 are connected in series, parallel or mixed connection, thereby meeting the user's requirements for the output voltage, output current and rated output power of the battery device 200, and the storage capacity of the battery device 200 assembled and formed by the plurality of battery cells 100 can improve the endurance of the battery device 200.

[0058] As shown in FIG. 1, the battery device 200 includes a plurality of battery cell assemblies 101, a plurality of battery cell assemblies 101 are arranged in the second direction Y, that is, the plurality of battery cell assemblies 101 are arranged in the second direction Y to form the battery device 200. Figure 2As shown, in some embodiments, in the plurality of battery monomers 100 distributed in a rectangular array, the plurality of second thermal management structures 12 between the two adjacent columns of battery monomers 100 along the second direction Y are sequentially connected and formed into an integrated structure. In this way, the storage heat of the larger second thermal management structure 12 connected and formed into an integrated structure along the second direction Y is increased, so that the temperature rising speed of the larger second thermal management structure 12 is further reduced. Moreover, the number of second thermal management structures 12 is reduced in the present embodiment. For example, the battery device 200 includes 4Х4 battery monomers 100, i.e. the battery device 200 includes 4 battery monomer assemblies 101, each of which includes 4 battery monomers 100. If one independent second thermal management structure 12 is arranged between the two adjacent battery monomers 100 in each battery monomer assembly 101, a total of 12 second thermal management structures 12 are needed. If the plurality of second thermal management structures 12 between the two adjacent columns of battery monomers 100 along the second direction Y are sequentially connected and formed into a larger second thermal management structure 12, the number of larger second thermal management structures 12 is reduced to 3. In this way, the storage cost, the moving and transportation cost, etc. of the second thermal management structure 12 can be reduced, so that the overall production cost of the battery device 200 is reduced.

[0059] As shown, in some embodiments, the second thermal management structure 12 further includes a second thermal insulation layer 123, the second temperature control layer 122 includes a first phase-change temperature control sub-layer 1221 and a second phase-change temperature control sub-layer 1222, and the first phase-change temperature control sub-layer 1221, the second thermal insulation layer 123 and the second phase-change temperature control sub-layer 1222 are sequentially stacked. Figure 8 By arranging the second thermal insulation layer 123 in the second thermal management structure 12, the heat blocking ability of the second thermal management structure 12 between the two adjacent battery monomers 100 is further improved, so that the degree of thermal interference between the two adjacent battery monomers 100 is further reduced.

[0060] As shown, in some embodiments, the second thermal management structure 12 further includes a second thermal insulation layer 123, the second temperature control layer 122 includes a first phase-change temperature control sub-layer 1221 and a second phase-change temperature control sub-layer 1222, and the first phase-change temperature control sub-layer 1221, the second thermal insulation layer 123 and the second phase-change temperature control sub-layer 1222 are sequentially stacked. Figure 7 and Figure 9As shown, in some embodiments, the second thermal management structure 12 further comprises a second heat dissipation device 124, the second heat dissipation device 124 is embedded in the second temperature control layer 122, the second heat dissipation device 124 is connected to the box 210 or the liquid cooling plate 20, and the second heat dissipation device 124 is used to dissipate heat of the second temperature control layer 122. When the battery device 200 works for a long time, after the phase change material in the second temperature control layer 122 stores enough heat, the temperature of the second temperature control layer 122 rises to the temperature of the battery monomer 100, and then the phase change material in the second temperature control layer 122 cannot continue to store heat. Therefore, through the embedded second heat dissipation device 124, the heat of the second temperature control layer 122 can be dissipated, so that the phase change material in the second temperature control layer 122 can always absorb the heat of the battery monomer 100, so that the battery monomer 100 can realize more rapid heat dissipation and cooling, and the battery monomer 100 can be kept in the normal working temperature range.

[0061] In some embodiments, the second heat dissipation device 124 comprises a heat dissipation fin, the end of the heat dissipation fin extends out of the second temperature control layer 122, and the end of the heat dissipation fin is connected to the box 210 or the liquid cooling plate 20 to release the heat of the heat dissipation fin, that is, to release the heat of the second temperature control layer 122. In this embodiment, the heat dissipation fin guides the heat of the second temperature control layer 122 to the box 210, and the heat is radiated to the external environment through the box 210, so as to realize the dissipation of the heat of the second temperature control layer 122. Alternatively, the end of the heat dissipation fin can be connected to the liquid cooling plate 20, and then the heat dissipation fin guides the heat of the second temperature control layer 122 to the liquid cooling plate 20, and the cooling liquid flowing in the liquid cooling plate 20 carries away the heat, that is, the second temperature control layer 122 can release heat.

[0062] In other embodiments, the second heat dissipation device 124 comprises a heat pipe, the end of the heat pipe extends out of the second temperature control layer 122, and the end of the heat pipe is connected to the box 210 or the liquid cooling plate 20 to release the heat of the heat pipe, that is, to release the heat of the second temperature control layer 122.

[0063] In some embodiments, the first heat conduction layer 111 and / or the second heat conduction layer 121 comprises a heat conduction glue, during the assembly of the battery device 200, a layer of heat conduction glue is coated on the outer wall of the battery monomer 100, then the first thermal management structure 11 and the second thermal management structure 12 are attached to the outer wall of the battery monomer 100 through the heat conduction glue, and then the heat conduction glue is cured by standing or drying, that is, the heat conduction glue is cured and formed. Through the heat conduction glue, small gaps between the first thermal management structure 11 and the outer wall of the battery monomer 100 and between the second thermal management structure 12 and the outer wall of the battery monomer 100 can be filled, so as to improve the heat conduction efficiency between the first thermal management structure 11 and the battery monomer 100 and between the second thermal management structure 12 and the battery monomer 100.

[0064] In some embodiments, the first thermal insulation layer 113 and / or the second thermal insulation layer 123 comprises at least one of aerogel, polyurethane, phenolic resin foam. The thermal conductivity of aerogel, polyurethane, phenolic resin foam is small, and the thermal insulation effect is good, which can well block the heat radiation transmission between the two adjacent battery monomers 100, thereby reducing the degree of thermal interference between the two adjacent battery monomers 100.

[0065] According to a second aspect of the embodiments of the present application, the embodiments of the present application further provide a power utilization device 400, which comprises a power utilization load 410, and the power utilization load 410 is electrically connected to a battery device 200 as shown. Figure 10

[0066] The power utilization device 400 includes but is not limited to electric toys, electric tools, electric cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include but are not limited to fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include but is not limited to airplanes, rockets, space shuttles, and spaceships, etc.

[0067] In some embodiments of the present application, the power utilization device 400 further comprises the battery device 200 as described above, that is, the power utilization device 400 adopts one battery device 200 or adopts multiple battery devices 200 in series, parallel or mixed connection, and the power utilization load 410 is electrically connected to the battery device 200. The battery device 200 is used to store electrical energy, or the battery device 200 is used to provide electrical energy to the power utilization load 410, so that the power utilization load 410 can operate normally.

[0068] Among them, the power utilization device 400 is an electric vehicle, and the battery device 200 is assembled as shown. Figure 10 ​As shown, the battery device 200 is mounted on a frame 430 of an electric vehicle. The electric vehicle comprises the frame 430, a driving motor and wheels 440, the battery device 200 and the driving motor are fixedly mounted on the frame 430, the wheels 440 are rotatably connected to the frame 430, and the battery device 200 is electrically connected to the driving motor, and the driving motor is drivingly connected to the wheels 440. The battery device 200 provided by the present application is applied to supply power to the driving motor (the driving motor is one of the power consumption loads 410 of the power utilization equipment 400), so that the driving motor drives the wheels 440 to rotate, so that the electric vehicle can normally travel. Moreover, the electric vehicle comprises a control device 420, the control device 420 is mounted on the frame 430, the control device 420 is electrically connected to the battery device 200, and the control device 420 is used to control and monitor the charging and discharging working state of the battery device 200. In some electric vehicles, the battery box of the battery device 200 can be part of the chassis structure of the electric vehicle. For example, part of the battery box can be at least part of the floor of the electric vehicle, or part of the battery box can be at least part of the cross beam and longitudinal beam of the electric vehicle.

[0069] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized by, The battery device comprises: a box body; a battery cell assembly arranged in the box body; a thermal management assembly comprising a first thermal management structure arranged between the battery cell assembly and an inner side wall of the box body in a direction from the battery cell assembly to the inner side wall of the box body, the first thermal management structure comprising a first heat conduction layer, a first temperature control layer and a first thermal insulation layer arranged in sequence, the first heat conduction layer abutting at least part of an outer wall of the battery cell assembly, the first thermal insulation layer abutting the inner side wall of the box body, and the first temperature control layer comprising a phase change material; the battery cell assembly comprises a plurality of battery cells arranged in a first direction, the battery cells having opposite top end walls and bottom end walls, the top end walls being provided with pressure relief mechanisms, the battery device further comprising a liquid cooling plate arranged between the box body and the bottom end walls, the liquid cooling plate abutting the bottom end walls, and a side wall of the battery cell assembly and the inner side wall of the box body being provided with the first thermal management structure.

2. The battery device according to claim 1, wherein the first thermal management structure is arranged between the top end walls and the inner side wall of the box body, at least part of the top end walls abutting the first heat conduction layer, and the pressure relief mechanisms and the first thermal management structure having a spacing therebetween.

3. The battery device according to claim 2, wherein the first thermal management structure further comprises a first heat dissipation device embedded in the first temperature control layer, the first heat dissipation device being connected to the box body or the liquid cooling plate, and the first heat dissipation device being used for dissipating heat of the first temperature control layer.

4. The battery device according to claim 3, wherein the first heat dissipation device comprises heat dissipation fins, end portions of the heat dissipation fins extending out of the first temperature control layer, and the heat dissipation fins being used for releasing heat of the first temperature control layer; and / or the first heat dissipation device comprises heat pipes, end portions of the heat pipes extending out of the first temperature control layer, and the heat pipes being used for releasing heat of the first temperature control layer.

5. The battery device according to any one of claims 1-4, wherein the thermal management assembly further comprises a plurality of second thermal management structures, one second thermal management structure being arranged between two adjacent battery cells in one battery cell assembly, the second thermal management structure comprising two second heat conduction layers and a second temperature control layer arranged between the two second heat conduction layers, the two second heat conduction layers abutting side walls of the two adjacent battery cells respectively, and the second temperature control layer comprising a phase change material.

6. The battery device according to claim 5, wherein the battery device comprises a plurality of battery cell assemblies, the plurality of battery cell assemblies being distributed in a second direction to make the plurality of battery cells arranged in a rectangular array, the second direction being perpendicular to the first direction, and the plurality of second thermal management structures between two adjacent columns of battery cells in the second direction being connected in sequence to form an integrated structure.

7. The battery device according to claim 5, wherein ​ The second thermal management structure further comprises a second thermal insulation layer, the second temperature control layer comprises a first phase change temperature control sub-layer and a second phase change temperature control sub-layer, and the first phase change temperature control sub-layer, the second thermal insulation layer and the second phase change temperature control sub-layer are sequentially stacked.

8. The battery device of claim 5, wherein, The second thermal management structure further comprises a second heat dissipation device, the second heat dissipation device is embedded in the second temperature control layer, the second heat dissipation device is connected to the box or the liquid cooling plate, and the second heat dissipation device is used for dissipating heat of the second temperature control layer.

9. The battery device of claim 8, wherein, The second heat dissipation device comprises heat dissipation fins, the end of the heat dissipation fins extends out of the second temperature control layer, and the heat dissipation fins are used for releasing heat of the second temperature control layer. And / or, the second heat dissipation device comprises a heat pipe, the end of the heat pipe extends out of the second temperature control layer, and the heat pipe is used for releasing heat of the second temperature control layer.

10. The battery device of claim 5, wherein, The first heat conduction layer and / or the second heat conduction layer comprises a heat conduction adhesive, and the heat conduction adhesive is solidified and formed.

11. The battery device of claim 7, wherein, The first thermal insulation layer and / or the second thermal insulation layer comprises one of aerogel, polyurethane and phenolic resin foam.

12. An electric device, comprising an electric load and the battery device of any one of claims 1-11, and the electric load is electrically connected to the battery device. ​

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