Battery device, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a power utilization device and an energy storage device. The battery device comprises a battery monomer assembly and a box body assembly. The battery cell assembly includes a plurality of battery cells. The box body assembly comprises a frame and a heat management part, the frame comprises a boundary beam, the boundary beam is arranged around the battery monomer assembly, a heat exchange flow channel is formed in the boundary beam, the heat management part is located on one side of the battery monomer assembly, the heat management part is in heat conduction connection with the battery monomer assembly, and a heat exchange channel is formed in the heat management part; the heat exchange flow channels and the heat exchange channels are configured to enable heat exchange media to flow in and flow out. According to the battery device, the heat exchange flow channel is arranged in the boundary beam, and the heat exchange flow channel is communicated with the heat exchange channel in the heat management component to form the heat exchange flow path, so that the heat exchange area is increased, the battery monomers in the battery device can reach a proper working temperature range more quickly, and the performance of the battery device is more stable during working.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device, an electrical device and an energy storage device. Background Art

[0002] The performance of batteries varies in different working environments. High or low temperatures will have a significant impact on the performance of batteries. Currently, the temperature of batteries is regulated by water cooling plates, which exchange heat with the battery cells in the battery. The heat exchange area is limited, which affects the heat exchange effect of the battery. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device, an electrical device and an energy storage device, which can improve the heat exchange effect of the battery.

[0004] In a first aspect, the present application provides a battery device, comprising:

[0005] A battery cell assembly, comprising a plurality of battery cells;

[0006] A box assembly includes a frame and a thermal management component. The frame includes side beams, which are arranged around a battery cell assembly. A heat exchange flow channel is provided inside the side beam. The thermal management component is located on one side of the battery cell assembly. The thermal management component is thermally connected to the battery cell assembly. A heat exchange channel is provided inside the thermal management component. The heat exchange flow channel and the heat exchange channel are respectively configured to pass in and out of a heat exchange medium. The side beams include a first side beam, a second side beam, a third side beam and a fourth side beam which are connected end to end in sequence. The first side beam and the third side beam are arranged at intervals along a first direction, and the second side beam and the fourth side beam are arranged at intervals along a second direction. The first side beam, the second side beam, the third side beam and the fourth side beam all have heat exchange flow channels inside. The first direction and the second direction intersect, and a plane in which the first direction and the second direction are located intersects with a height direction of the box assembly.

[0007] By arranging heat exchange channels inside the side beams and introducing heat exchange medium into the heat exchange channels and heat exchange channels respectively, heat exchange can be performed with the battery cells. Compared with the traditional method of only relying on water cooling plates to perform heat exchange with battery cells, the heat exchange area is increased to reduce the impact of the cold or heat of the external environment on the battery cells close to the side beams. The larger heat exchange area enables the heat exchange medium to more fully exchange heat with the battery cells, thereby more efficiently regulating the temperature of the battery, so that the battery cells in the battery device can reach the appropriate operating temperature range more quickly, and the performance of the battery device can be more stable during operation. At the same time, the heat exchange channel of the frame design of the box assembly can be more fully utilized without changing the original space of the box assembly for accommodating the battery cell assembly. There is no need to add additional heat exchange components to increase the heat exchange area, thereby improving the space utilization of the box assembly.

[0008] In some embodiments, the heat exchange flow path is in communication with the heat exchange channel.

[0009] After the heat exchange flow channel and the heat exchange passage are connected, the two together constitute a heat exchange flow path, which can increase the length of the heat exchange flow path to improve the heat exchange efficiency, while reducing the connection of pipelines, making the structure more compact and reducing the cost of arranging pipelines.

[0010] In some embodiments, the first side beam, the second side beam, the third side beam and the fourth side beam all include a plurality of layers of flow channels spaced apart along the height direction of the box assembly. In the same side beam, the plurality of layers of flow channels are connected in series or in parallel to form a heat exchange flow channel. The heat exchange flow channels in the first side beam, the second side beam, the third side beam and the fourth side beam are sequentially connected in series to form a first heat exchange flow channel, and the first heat exchange flow channel is connected in series with the heat exchange channel.

[0011] The multi-layer flow channels are connected in series, and the first heat exchange flow channel is connected in series with the heat exchange channel, which can increase the length of the flow channel, so that the heat exchange medium in the flow channel can fully absorb heat and increase the heat exchange area. The multi-layer flow channels are connected in parallel, and the heat exchange medium can be introduced into the multi-layer flow channels at the same time to improve the temperature around the battery monomer assembly at the same time, reduce the impact of the external environment on the temperature around the battery monomer assembly, and enable the battery monomer assembly to work within the set temperature range to give full play to the performance of the battery monomer assembly.

[0012] In some embodiments, the first side beam, the second side beam, the third side beam and the fourth side beam all include multi-layer flow channels spaced apart in the height direction of the box assembly, and the same layer of flow channels in the first side beam, the second side beam, the third side beam and the fourth side beam are sequentially connected in series to form multi-layer circulation channels surrounding the battery cell assembly;

[0013] Two adjacent layers of circulation channels are connected in parallel to form a first heat exchange channel, and the first heat exchange channel is connected in parallel to the heat exchange channel.

[0014] In this embodiment, the flow channels in the same layer of the first side beam, the second side beam, the third side beam and the fourth side beam are connected in series in sequence, and the first heat exchange flow channel is connected with the heat exchange channel in parallel, and the heat exchange medium can be introduced into the first heat exchange flow channel and the heat exchange channel at the same time, so that the heat exchange is cut off and heat is exchanged in various areas of the battery cell at the same time, reducing the temperature difference of various areas of the battery cell, so that the battery cells in different areas can be charged and discharged within a suitable temperature range, so that the battery device can give full play to its performance.

[0015] In some embodiments, the circulating channel has a first flow outlet and a first flow inlet, and the first flow inlet and the first flow outlet are spaced apart along the length direction of the circulating channel. The circulating channel has a blocking portion, which is used to block the circulating channel between the first flow inlet and the first flow outlet.

[0016] Thus, the heat exchange medium can be first introduced into the first inlet, so that the heat exchange medium passes through the multi-layer circulation channel and the heat exchange channel at the same time, and converges and flows out at the first outlet. The temperature of the heat exchange medium for heat exchange around the battery cell assembly and the bottom of the battery cell assembly is not much different, so as to reduce the temperature difference around the battery cell assembly and the bottom of the battery cell assembly during the heat exchange process, thereby reducing the situation where the temperature of the local position of the battery cell is too high or too low to affect its performance, so that the battery cell assembly can more fully exert its performance.

[0017] In some embodiments, the interior of the reinforcing beam has multiple layers of flow paths spaced apart along the height direction of the box assembly, two adjacent layers of flow paths are connected in parallel or in series, and both ends of the same layer of flow paths are respectively connected to the same layer of circulating channels.

[0018] On the one hand, it can improve the overall strength of the box assembly, and on the other hand, it can divide the frame into multiple spaces to place different battery cell assemblies, so as to reduce excessive heat concentration during the battery cell process and more conveniently adjust the temperature of the battery cell.

[0019] In some embodiments, the side beam has a first heat exchange medium interface;

[0020] The first heat exchange medium interface is in communication with the flow channel at the top layer in the first side beam, or the first heat exchange medium interface is in communication with the flow channel at the top layer in the fourth side beam;

[0021] The thermal management component has a second heat exchange medium interface connected to the heat exchange channel, one of the first heat exchange medium interface and the second heat exchange medium interface is configured to allow heat exchange medium to enter, and the other of the first heat exchange medium interface and the second heat exchange medium interface is configured to allow heat exchange medium to flow out.

[0022] Thus, the heat exchange medium can be introduced into one of the first heat exchange medium interface and the second heat exchange medium interface, so that the heat exchange medium flows out from the other of the first heat exchange medium interface and the second heat exchange medium interface to exchange heat at the bottom and around the battery cell assembly. This method can simplify the pipelines connected to the side beams and thermal management components, making the structure more compact.

[0023] In some embodiments, the thermal management component is located at the bottom of the frame and is connected to the frame;

[0024] The side beam further includes a first reinforcement member, a first wall between two adjacent layers of flow channels is connected to the first reinforcement member, a first cavity is provided inside the first reinforcement member, and the two adjacent layers of flow channels are connected through the first cavity.

[0025] And / or, the side beam includes a second reinforcement, a second wall is provided between the first heat exchange channel and the heat exchange channel, the second wall is connected to the second reinforcement, the interior of the second reinforcement includes a second cavity, and the first heat exchange channel and the heat exchange channel are connected through the second cavity.

[0026] Thus, the strength of the wall between two adjacent layers of flow channels at the connection point can be improved to reduce the deformation of the wall between two adjacent layers of flow channels when subjected to various mechanical forces, thereby improving the reliability of the flow channel operation.

[0027] In some embodiments, the side beam includes a first reinforcement, a second reinforcement and a sealing portion. Along the height direction of the box body, the first reinforcement and the second reinforcement respectively penetrate the first wall between two adjacent layers of flow channels. Along the length direction of the circulating flow channel, the first reinforcement and the second reinforcement are arranged at intervals. There is a sealing portion between each layer of flow channels. The sealing portion is used to block part of the flow channel between the first reinforcement and the second reinforcement. The first reinforcement has a first cavity inside, and the second reinforcement has a second cavity inside. The heat exchange channel has a first heat exchange outlet and a second heat exchange inlet. The first heat exchange outlet and the multi-layer flow channel are respectively connected to the first cavity, and the second heat exchange inlet and the multi-layer flow channel are respectively connected to the second cavity.

[0028] Thus, the strength of the wall between two adjacent layers of flow channels at the connection point can be improved to reduce the deformation of the wall between two adjacent layers of flow channels when subjected to various mechanical forces, thereby improving the reliability of the flow channel operation.

[0029] In some embodiments, the plurality of battery cells have a plurality of rows, and a thermal management component is disposed between two adjacent rows of battery cells.

[0030] The thermal management component is located between two adjacent rows of battery cells, and can regulate heat exchange in the side areas of the two adjacent rows of battery cells. The heat exchange flow channel in the frame controls the heat from the side beams and spacing parts of the battery cell assembly to achieve multi-directional coordinated heat exchange, so as to reduce the impact of the external environment on the battery cells adjacent to the side beams, thereby improving the uniformity of the temperature of multiple battery cells and enabling each battery cell to operate in a suitable temperature environment.

[0031] In some embodiments, the thermal management component is located at the bottom of the battery cell assembly, and the thermal management component is connected to the frame to form a first box.

[0032] The thermal management component is connected to the frame to form a box, which can protect the battery cell assembly so that the battery cell assembly can work stably. At the same time, the thermal management component serves as the bottom wall of the box and can exchange heat with multiple battery cells in the box, which can more effectively regulate the temperature of the battery cells and enable the battery cells in the battery device to reach a suitable operating temperature range more quickly.

[0033] In some embodiments, the frame and the thermal management component are integrally formed.

[0034] The frame and thermal management components are integrated to reduce the connection gaps and loose interfaces that may exist in traditional connection methods, and improve the stability of the structure. When external force acts on the battery device, the stress can be naturally dispersed throughout the integrated structure, reducing the local structural damage that may be caused by stress concentration at the connection point, allowing the battery cells to work more safely and stably.

[0035] In some embodiments, the thermal management component is a metal part and the frame is a non-metal part.

[0036] The thermal management component is a metal part, which has a certain rigidity and can keep the internal heat exchange channel working normally under the gravity of multiple battery cells. The frame is a non-metallic part, and the thermal management component and the frame can be injection molded into an integrated structure to facilitate manufacturing.

[0037] In a second aspect, the present application provides an electrical device, comprising the battery device of the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0038] Since the battery device includes all the technical features of the battery device of the first aspect, the effects are the same as those described above and will not be described in detail here.

[0039] In a third aspect, the present application provides an energy storage device, including a cabinet and a battery cluster. The battery cluster is accommodated in the cabinet, and the battery cluster includes a plurality of battery devices according to the first aspect.

[0040] Since the energy storage device includes all the technical features of the battery device of the first aspect, the effects are the same as those described above and will not be described in detail here.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0043] Figure 1 A structural diagram of a vehicle in which an electric device according to an embodiment of the present application is used;

[0044] Figure 2 An exploded view of a battery cell according to an embodiment of the present application;

[0045] Figure 3 An isometric diagram of a battery device according to an embodiment of the present application;

[0046] Figure 4 for Figure 3 A top view of

[0047] Figure 5 An isometric view of a frame in a battery device according to an embodiment of the present application;

[0048] Figure 6 for Figure 4 AA section view;

[0049] Figure 7 for Figure 6 A local enlarged view at location I;

[0050] Fig. 8A It is a structural diagram of the longitudinal section of the side beam of the first embodiment of the present application, the longitudinal section is perpendicular to the cross section of the side beam, and the cross section is perpendicular to the length direction of the side beam;

[0051] Figure 8B A structural diagram of a longitudinal section of a side beam of the first embodiment of the present application;

[0052] Fig. 9 This is a structural diagram of a first cross section of each layer of the circulation path of an embodiment of the present application, where the first cross section is perpendicular to the height direction of the box assembly;

[0053] Fig.10 for Figure 4 BB cross-sectional view;

[0054] Fig.11 It is an isometric view of a battery device according to another embodiment of the present application;

[0055] Fig.12 for Fig.11 DD cross-sectional view;

[0056] Fig.13 It is an isometric view of a battery device according to another embodiment of the present application;

[0057] Fig.14 for Fig.13 A local enlarged view of location II;

[0058] Fig.15 This is an axonometric diagram of an energy storage device according to an embodiment of the present application.

[0059] The reference numerals in the specific implementation manner are as follows:

[0060] 1000. Vehicles;

[0061] 100. Battery device;

[0062] 10. Box assembly; 111. Frame; 1110. Side beam; 1111. First side beam; 1112. Second side beam; 1113. Third side beam; 1114. Fourth side beam; 1115. Reinforcement beam; 11151. Flow path; 1116. Flow channel; 11161. First flow outlet; 11162. First flow inlet; 11163. First wall; 11164. Second wall; 1117. First reinforcement member; 1118. Second reinforcement member; 1119. Blocking portion; 112. Thermal management component; 1121. Heat exchange channel;

[0063] 110, battery cell assembly; 20, battery cell; 21, housing; 211, housing; 212, end cap; 2121, electrode terminal; 2122, pressure relief mechanism; 22, electrode assembly; 23, current collecting member;

[0064] 2000, energy storage device; 2100, cabinet; 2200, battery cluster;

[0065] X, first direction; Y, second direction; Z, height direction. DETAILED DESCRIPTION

[0066] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0068] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0069] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0070] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0071] In the description of the embodiments of the present application, the term "multiple" refers to more than two including two. Similarly, "multiple groups" refers to more than two groups including two groups, and "multiple sheets" refers to more than two sheets including two sheets.

[0072] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application 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 a limitation on the embodiments of the present application.

[0073] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0074] The performance of batteries varies in different working environments. High or low temperatures will have a significant impact on the performance of batteries. Currently, the temperature of batteries is regulated by water cooling plates, which exchange heat with the battery cells in the battery. The heat exchange area is limited, which affects the heat exchange effect of the battery.

[0075] The present application provides a battery device, which can perform heat exchange with battery cells by arranging heat exchange channels inside the side beams and respectively introducing heat exchange medium into the heat exchange channels and the heat exchange channels. Compared with the traditional method of only relying on water cooling plates to perform heat exchange with battery cells, the heat exchange area is increased. The larger heat exchange area enables the heat exchange medium to more fully exchange heat with the battery cells, thereby more efficiently regulating the temperature of the battery, so that the battery cells in the battery device can reach a suitable operating temperature range more quickly, and the performance of the battery device can be more stable during operation. At the same time, the heat exchange channels of the frame design of the box assembly can be more fully utilized without changing the original space of the box assembly for accommodating the battery cell assembly, without the need to add additional heat exchange components to increase the heat exchange area, thereby improving the space utilization rate of the box assembly.

[0076] Please refer to Figure 2 The battery cell 20 generally includes an electrode assembly 22. The electrode assembly 22 includes a positive electrode, a negative electrode, and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 20, active ions such as lithium ions are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through.

[0077] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0078] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0079] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy on a polymer material substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.

[0080] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate such as LiFePO4 It can also be referred to as LFP, a composite material of lithium iron phosphate and carbon, lithium manganese phosphate such as LiMnPO 4 , a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxides such as LiCoO 2 , lithium nickel oxide such as LiNiO 2 , lithium manganese oxide such as LiMnO 2 、LiMn 2 O 4 , lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 It can also be referred to as NCM 333 、LiNi 0.5 Co 0.2 Mn 0.3 O 2 It can also be referred to as NCM 523 、LiNi 0.5 Co 0.25 Mn 0.25 O 2 It can also be referred to as NCM 211 、LiNi 0.6 Co 0.2 Mn 0.2 O 2 It can also be referred to as NCM 622 、LiNi 0.8 Co 0.1 Mn 0.1 O 2 It can also be referred to as NCM 811 , lithium nickel cobalt aluminum oxide such as LiNi 0.8 Co 0.15 Al 0.05 O 2 and at least one of its modified compounds. The modified compound refers to a substance obtained by modifying the above substances by means of doping or coating.

[0081] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon. When the foamed metal is used as the positive electrode, the positive electrode active material may not be disposed on the surface of the foamed metal, but of course, the positive electrode active material may also be disposed. As an example, the positive electrode active material is filled or / and deposited in the foamed metal.

[0082] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0083] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium or silver. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy on a polymer material substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.

[0084] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0085] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0086] As an example, the negative electrode active material may adopt the negative electrode active material for the battery cell 20 known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for the battery cell 20 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0087] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0088] As an example, a negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0089] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0090] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0091] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator.

[0092] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0093] In some embodiments, the battery cell 20 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0094] The liquid electrolyte includes an electrolyte salt and a solvent.

[0095] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0096] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0097] In some embodiments, the electrolyte may also optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 20, such as additives that improve the overcharge / fast charge performance of the battery cell 20, additives that improve the high temperature performance of the battery cell 20, and additives that improve the low temperature performance of the battery cell 20.

[0098] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0099] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0100] As examples, the polymer of the polymer solid electrolyte may include polyether polyethylene oxide, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0101] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte such as crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film, a sulfide solid electrolyte such as crystalline lithium superion conductor lithium germanium phosphosulfide, silver germanium sulfide, amorphous sulfide, and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0102] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0103] In some embodiments, the electrode assembly 22 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0104] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0105] In some embodiments, the shape of the electrode assembly 22 can be cylindrical, flat, or polygonal.

[0106] In some embodiments, the electrode assembly 22 is provided with tabs, which can conduct current from the electrode assembly 22. The tabs include a positive tab and a negative tab.

[0107] In some embodiments, see Figure 2 , the battery cell 20 may include a shell 21. The shell 21 may be a steel shell, an aluminum shell, a plastic shell such as polypropylene, a composite metal shell such as a copper-aluminum composite shell 21 or an aluminum-plastic film, etc. In some embodiments, the shell 21 may be a sealed structure or a non-sealed structure. As an example, when the shell 21 is a non-sealed structure, the shell 21 plays a role in protecting the electrode assembly 22, and a sealed bag is also included between the shell 21 and the electrode assembly 22, and the sealed bag is used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell 21 is a sealed structure, it is used to encapsulate components such as the electrode assembly 22 and the electrolyte.

[0108] In some embodiments, please continue to refer to Figure 2The housing 21 includes an end cap 212 and a shell 211. The shell 211 is provided with an opening, and the end cap 212 is provided to cover the opening. The shell 211 may be provided with one or more openings. One or more end caps 212 may also be provided.

[0109] In some embodiments, at least one electrode terminal 2121 is disposed on the housing 21, and the electrode terminal 2121 is electrically connected to the electrode tab. The electrode terminal 2121 may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through the current collecting member 23. The electrode terminal 2121 may be disposed on the end cap 212, or may be disposed on the housing 211.

[0110] In some embodiments, a pressure relief mechanism 2122 is disposed on the housing 21 . The pressure relief mechanism 2122 is used to discharge the internal gas of the battery cell 20 .

[0111] As an example, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 2122 performs an action or a weak structure provided in the pressure relief mechanism 2122 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell 20.

[0112] As an example, the pressure relief mechanism 2122 may be integrally formed with the housing 21 .

[0113] As an example, the pressure relief mechanism 2122 may also be separately provided and connected to the housing 21 .

[0114] The "actuation" mentioned in this application means that the pressure relief mechanism 2122 is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The action produced by the pressure relief mechanism 2122 may include but is not limited to: the components in the pressure relief mechanism 2122 move to form an exhaust channel, at least a part of the pressure relief mechanism 2122 ruptures, breaks, is torn or opened, and so on. When the pressure relief mechanism 2122 is actuated, the high-temperature and high-pressure substances inside the battery cell 20 will be discharged from the actuated part as emissions. In this way, the battery cell 20 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0115] In some embodiments, when the housing 21 is a non-sealed structure, the pressure relief mechanism 2122 can be configured as a through hole for discharging the gas inside the battery cell 20 .

[0116] The emissions from the battery cells 20 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, and the like.

[0117] The battery apparatus mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 20, and the plurality of battery cells 20 are connected in series, in parallel or in mixed connection through a busbar component.

[0118] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 20 .

[0119] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells 20 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 20 with a cable tie.

[0120] In some embodiments, the battery device may be a battery pack, which includes a case assembly and one or more battery cell assemblies, wherein the battery cell assembly is accommodated in the case assembly.

[0121] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box assembly by fixing the battery module in the box assembly.

[0122] In some embodiments, please refer to Figure 1 The box assembly can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box assembly can become at least a part of the floor of the vehicle, or part of the box assembly can become at least a part of the cross beam and the longitudinal beam of the vehicle 1000.

[0123] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells 20, such as electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0124] For the convenience of explanation, please refer to the following examples. Figure 3-Figure 14 , a battery device 100 according to some embodiments of the present application is taken as an example for description.

[0125] The battery device 100 includes a battery cell assembly and a box assembly 10. The battery cell assembly includes a plurality of battery cells.

[0126] The box assembly 10 includes a frame 111 and a thermal management component 112. The frame 111 includes a side beam 1110. The side beam 1110 is arranged around the battery cell assembly. The side beam 1110 has a heat exchange channel 1116 inside. The thermal management component 112 is located on one side of the battery cell assembly. The thermal management component 112 is thermally connected to the battery cell assembly. The thermal management component 112 has a heat exchange channel 1121 inside. The heat exchange channel 1116 and the heat exchange channel 1121 are respectively configured to allow heat exchange medium to enter and flow out.

[0127] The thermal management component 112 may be disposed at the bottom, top, or between two adjacent battery cells.

[0128] The heat exchange channel 1121 in the thermal management component 112 may be a straight channel, a curved channel, or a composite channel formed by combining a curved channel and a straight channel.

[0129] Thermal connection refers to a connection relationship between the thermal management component 112 and the battery cell assembly that enables effective heat conduction. For example, the thermal connection can be a direct fit between the thermal management component 112 and the battery cell assembly, or the thermal management component 112 and the battery cell assembly are connected by means of thermal conductive adhesive or the like.

[0130] The heat exchange flow channel 1116 and the heat exchange channel 1121 may be connected to each other or may not be connected to each other.

[0131] The heat exchange channel 1116 may be a straight channel, a curved channel, or a composite channel formed by combining a curved channel and a straight channel.

[0132] The heat management component 112 may be a part of the first housing, or may be a separate component.

[0133] By arranging a heat exchange channel 1116 inside the side beam 1110 and introducing a heat exchange medium into the heat exchange channel 1116 and the heat exchange channel 1121 respectively, heat exchange can be performed with the battery cell. Compared with the traditional method of only relying on a water cooling plate to perform heat exchange with the battery cell, the heat exchange area is increased. The larger heat exchange area enables the heat exchange medium to more fully exchange heat with the battery cell, thereby more efficiently adjusting the temperature of the battery, so that the battery cell in the battery device 100 can reach a suitable operating temperature range more quickly, and the performance of the battery device 100 can be more stable during operation. At the same time, the frame 111 of the box assembly 10 can be more fully utilized to design the heat exchange channel 1116 without changing the original space of the box assembly 10 for accommodating the battery cell assembly, without adding additional heat exchange components to increase the heat exchange area, thereby improving the space utilization of the box assembly 10.

[0134] In some embodiments, please refer to Figure 1-Figure 3The side beam 1110 includes a first side beam 1111, a second side beam 1112, a third side beam 1113 and a fourth side beam 1114 which are connected end to end in sequence, the first side beam 1111 and the third side beam 1113 are arranged at intervals along the first direction, the second side beam 1112 and the fourth side beam 1114 are arranged at intervals along the second direction, at least one of the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 has a heat exchange channel 1116 inside, the first direction and the second direction intersect, and a common plane of the first direction and the second direction intersects with a height direction of the box assembly 10.

[0135] The first side beam 1111 to the fourth side beam 1114 can be made of metal beams or non-metal parts. The first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 are connected end to end to form the frame 111. Specifically, they can be connected by injection molding into an integrated structure or welding.

[0136] At least one of the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 has a heat exchange channel 1116 inside. By introducing a heat exchange medium into the heat exchange channel 1116, the temperature of the battery cells close to the side beam 1110 can be adjusted to reduce the impact of the cold or heat of the external environment on the battery cells close to the side beam 1110; at the same time, in different usage environments, the impact of the temperature of the first side beam 1111 to the fourth side beam 1114 on the battery cells may also be different. The heat exchange channel 1116 can also be set inside the first side beam 1111 to the interior of one or more of the fourth side beam 1114 according to the usage environment to improve the versatility of the battery device 100.

[0137] In some embodiments, the heat exchange flow channel 1116 is connected to the heat exchange channel 1121 .

[0138] The heat exchange channel 1121 of the heat management component 112 and the heat exchange flow channel 1116 in the frame 111 can be connected through pipelines, joints or connecting holes.

[0139] After the heat exchange flow channel 1116 and the heat exchange channel 1121 are connected, the two together constitute a heat exchange flow path, which can increase the length of the heat exchange flow path to improve the heat exchange efficiency, while reducing the connection of pipelines, making the structure more compact and reducing the cost of arranging pipelines.

[0140] In some embodiments, please refer to Fig. 8A and 8BThe first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 all include multi-layer flow channels 1116 spaced apart along the height direction of the box assembly 10. In the same side beam 1110, the multi-layer flow channels 1116 are connected in series or in parallel to form a heat exchange flow channel 1116. The heat exchange flow channels 1116 in the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 are connected in series in sequence to form a first heat exchange flow channel, and the first heat exchange flow channel is connected in series with the heat exchange channel 1121.

[0141] Fig. 8A A cross-sectional view is illustrated in which the multi-layer flow channels 1116 inside any one of the first side beam 1111 , the second side beam 1112 , the third side beam 1113 , and the fourth side beam 1114 are connected in parallel.

[0142] Figure 8B A cross-sectional view is illustrated in which the multi-layer flow channels 1116 inside any one of the first side beam 1111 , the second side beam 1112 , the third side beam 1113 , and the fourth side beam 1114 are connected in series.

[0143] Each layer of the circulation channel has a first flow outlet 11161 and a first flow inlet 11162. The first flow inlet 11162 and the first flow outlet 11161 are arranged at intervals along the length direction of the circulation channel. The circulation channel has a blocking portion 1119, which is used to block the circulation channel between the first flow inlet 11162 and the first flow outlet 11161. In any two adjacent layers of the circulation channels, the first flow outlet 11161 of the upper layer of the circulation channel serves as the flow inlet of the lower layer of the circulation channel. The heat exchange medium enters from the first flow inlet 11162 of the upper side circulation channel, flows to the end of the circulation channel, and then flows out from the first flow outlet 11161 of the circulation channel to enter the lower layer of the circulation channel. The heat exchange medium flows in the lower layer of the circulation channel in the same way until it flows out from the first flow outlet 11161 of the circulation channel at the bottom layer.

[0144] The multi-layer flow channels 1116 are connected in series, and the first heat exchange flow channel is connected in series with the heat exchange channel 1121, which can increase the length of the flow channel, so that the heat exchange medium in the flow channel can fully absorb heat and increase the heat exchange area. The multi-layer flow channels 1116 are connected in parallel, and the heat exchange medium can be introduced into the multi-layer flow channels 1116 at the same time to improve the temperature around the battery cell assembly at the same time, reduce the influence of the external environment on the temperature around the battery cell assembly, and enable the battery cell assembly to operate within the set temperature range to exert the performance of the battery cell assembly.

[0145] In some embodiments, please refer to Fig. 9The first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 all include multi-layer flow channels 1116 spaced apart along the height direction of the box assembly 10. The flow channels 1116 of the same layer in the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 are sequentially connected in series to form a multi-layer circulation channel surrounding the battery cell assembly. Two adjacent layers of the circulation channels are connected to form a first heat exchange flow channel, and the first heat exchange flow channel is connected in series with the heat exchange channel 1121.

[0146] Two adjacent layers of circulating channels can be connected in series or in parallel.

[0147] In this embodiment, the same layer of flow channels 1116 in the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 are connected in series in sequence, and the first heat exchange flow channel is connected in series with the heat exchange channel 1121. Compared with the parallel connection, the length of the flow channel can be increased, so that the heat exchange medium in the flow channel can fully absorb heat and the heat exchange area can be increased.

[0148] In some embodiments, please refer to Fig. 8A and Fig. 9 The first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 all include multi-layer flow channels 1116 spaced apart along the height direction Z of the box assembly 10. The same layer of flow channels 1116 in the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 are sequentially connected in series to form a multi-layer circulation channel surrounding the battery cell assembly. Two adjacent layers of circulation channels are connected in parallel to form a first heat exchange flow channel, and the first heat exchange flow channel is connected in parallel with the heat exchange channel 1121.

[0149] Fig. 8A The side beam 1110 in the embodiment may be any one of the first side beam 1111 , the second side beam 1112 , the third side beam 1113 and the fourth side beam 1114 .

[0150] Fig. 9 The cross-sectional view of each layer of the circulation channel is shown in the example.

[0151] Series connection means that two channels are connected end to end.

[0152] Parallel connection means that the inlets of two channels are connected to each other, the outlets are connected to each other, and in the same channel, the inlet and the outlet are located at two ends of the channel.

[0153] The multi-layer flow channels 1116 are connected in series, and the first heat exchange flow channel is connected in series with the heat exchange channel 1121, which can increase the length of the flow channel, so that the heat exchange medium in the flow channel can fully absorb heat and increase the heat exchange area. The multi-layer flow channels 1116 are connected in parallel, and the heat exchange medium can be introduced into the multi-layer flow channels 1116 at the same time to improve the temperature around the battery cell assembly at the same time, reduce the influence of the external environment on the temperature around the battery cell assembly, and enable the battery cell assembly to operate within the set temperature range to exert the performance of the battery cell assembly.

[0154] In some embodiments, please refer to Fig. 8A and Fig. 9 The circulation channel has a first flow outlet 11161 and a first flow inlet 11162. Along the length direction of the circulation channel, the first flow inlet 11162 and the first flow outlet 11161 are arranged at intervals. A blocking portion 1119 is provided in the circulation channel. The blocking portion 1119 is used to block the circulation channel between the first flow inlet 11162 and the first flow outlet 11161.

[0155] Thus, the heat exchange medium can be first introduced into the first inlet 11162, so that the heat exchange medium passes through the multi-layer circulation channel and the heat exchange channel 1121 at the same time, and converges and flows out at the first outlet 11161. The temperature of the heat exchange medium for heat exchange around the battery cell assembly and the bottom of the battery cell assembly is not much different, so as to reduce the temperature difference around the battery cell assembly and the bottom of the battery cell assembly during the heat exchange process, thereby reducing the situation where the local temperature of the battery cell is too high or too low to affect its performance, so that the battery cell assembly can more fully exert its performance.

[0156] In some embodiments, the interior of the reinforcing beam 1115 has a plurality of flow paths 11151 spaced apart along the height direction Z of the box assembly 10, two adjacent layers of flow paths 11151 are connected in parallel or in series, and both ends of the same layer of flow paths 11151 are respectively connected to the same layer of circulating channels.

[0157] As an example, the same laminar flow path 11151 can be connected in parallel with a section of the same side loop flow channel.

[0158] On the one hand, the overall strength of the box assembly 10 can be improved, and on the other hand, the frame 111 can be divided into multiple spaces to place different battery cell assemblies, so as to reduce excessive heat concentration during the battery cell process and more conveniently adjust the temperature of the battery cell.

[0159] In some embodiments, the side beam 1110 has a first heat exchange medium interface;

[0160] The first heat exchange medium interface is in communication with the topmost flow channel 1116 in the first side beam 1111, or the first heat exchange medium interface is in communication with the topmost flow channel 1116 in the fourth side beam 1114;

[0161] The thermal management component 112 has a second heat exchange medium interface connected to the heat exchange channel 1121, one of the first heat exchange medium interface and the second heat exchange medium interface is configured to allow heat exchange medium to enter, and the other of the first heat exchange medium interface and the second heat exchange medium interface is configured to allow heat exchange medium to flow out.

[0162] Thus, the heat exchange medium can be introduced into one of the first heat exchange medium interface and the second heat exchange medium interface, so that the heat exchange medium flows out from the other of the first heat exchange medium interface and the second heat exchange medium interface to exchange heat at the bottom and around the battery cell assembly. In this way, the pipelines connected to the side beam 1110 and the thermal management component 112 can be simplified, making the structure more compact.

[0163] In some embodiments, please refer to Figure 8B , the thermal management component 112 is located at the bottom of the frame 111 and connected to the frame 111, the side beam 1110 also includes a first reinforcement 1117, the first wall 11163 between the two adjacent layers of flow channels 1116 is connected to the first reinforcement 1117, the first reinforcement 1117 has a first cavity inside, and the two adjacent layers of flow channels 1116 are connected through the first cavity. In some embodiments, the thermal management component 112 is located at the bottom of the frame 111 and connected to the frame 111, the side beam 1110 includes a second reinforcement 1118, a second wall 11164 is provided between the first heat exchange flow channel and the heat exchange channel 1121, the second wall 11164 is connected to the second reinforcement 1118, the second reinforcement 1118 has a second cavity inside, and the first heat exchange flow channel and the heat exchange channel 1121 are connected through the second cavity.

[0164] As an example, the first reinforcement member 1117 may be a cylindrical structure, one end of the first reinforcement member 1117 is connected to the wall of two adjacent layers of flow channels 1116, and the other end of the first reinforcement member 1117 may be abutted against or spaced from the wall of the flow channel 1116. In another example, the first reinforcement member 1117 may be a curved pipe, one end of the curved pipe is connected to the wall of two adjacent layers of flow channels 1116, one end of the curved pipe is connected to the upper layer of flow channels 1116, and the other end of the curved pipe is connected to the lower layer of flow channels 1116.

[0165] Thus, the strength of the wall between two adjacent layers of flow channels 1116 at the connection point can be improved to reduce the deformation of the wall between two adjacent layers of flow channels 1116 when subjected to various mechanical forces, thereby improving the working reliability of the flow channels 1116.

[0166] In some embodiments, the side beam 1110 includes a first reinforcement 1117, a second reinforcement 1118 and a sealing portion 1119. Along the height direction of the box body, the first reinforcement 1117 and the second reinforcement 1118 respectively penetrate the first wall 11163 between two adjacent layers of flow channels 1116. Along the length direction of the circulating flow channel, the first reinforcement 1117 and the second reinforcement 1118 are arranged at intervals. There is a sealing portion 1119 between each layer of flow channels 1116. The sealing portion 1119 is used to block part of the flow channels 1116 between the first reinforcement 1117 and the second reinforcement 1118. The first reinforcement 1117 has a first cavity inside, and the second reinforcement 1118 has a second cavity inside. The heat exchange channel 1121 has a first heat exchange outlet and a second heat exchange inlet. The first heat exchange outlet and the multi-layer flow channels 1116 are respectively connected to the first cavity, and the second heat exchange inlet and the multi-layer flow channels 1116 are respectively connected to the second cavity.

[0167] Thus, the strength of the wall between the bottom-layer flow channel 1116 and the thermal management component 112 at the connection point can be improved to reduce the deformation of the wall between the bottom-layer flow channel 1116 and the thermal management component 112 at the connection point, thereby improving the reliability of heat exchange.

[0168] In some embodiments, the plurality of battery cells have a plurality of rows, and a thermal management component 112 is disposed between two adjacent rows of battery cells.

[0169] The number of battery cells in the same row may be more than one.

[0170] The thermal management component 112 is located between two adjacent rows of battery cells, and can regulate heat exchange in the side areas of the two adjacent rows of battery cells. The heat exchange channel 1116 in the frame 111 controls the heat from the side beams 1110 and the spacing parts of the battery cell assembly to achieve multi-directional coordinated heat exchange, thereby reducing the impact of the external environment on the battery cells adjacent to the side beams 1110, thereby improving the uniformity of the temperatures of multiple battery cells and enabling each battery cell to operate in a suitable temperature environment.

[0171] In some embodiments, the thermal management component 112 is located at the bottom of the battery cell assembly, and the thermal management component 112 is connected to the frame 111 to form a first box.

[0172] The thermal management component 112 is connected to the frame 111 to form a box body, which can protect the battery cell assembly so that the battery cell assembly can work stably. At the same time, the thermal management component 112 serves as the bottom wall of the box body and can exchange heat with multiple battery cells in the box body, which can more effectively regulate the temperature of the battery cells and enable the battery cells in the battery device 100 to reach a suitable operating temperature range more quickly.

[0173] In some embodiments, the frame 111 and the thermal management component 112 are integrally formed.

[0174] The frame 111 and the thermal management component 112 are integrally formed to reduce problems such as connection gaps and loose interfaces that may exist in traditional connection methods, and improve the stability of the structure. When external force acts on the battery device 100, the stress can be naturally dispersed throughout the entire integrated structure, reducing the local structural damage that may be caused by stress concentration at the connection site, so that the battery cells can work more safely and stably.

[0175] In some embodiments, the thermal management component 112 is a metal component, and the frame 111 is a non-metal component.

[0176] The thermal management component 112 is a metal part, which has a certain rigidity and can keep the internal heat exchange channel 1121 working normally under the gravity of multiple battery cells. The frame 111 is a non-metallic part, and the thermal management component 112 and the frame 111 can be injection molded into an integrated structure to facilitate manufacturing.

[0177] For the convenience of description, the following embodiments are described by taking an electrical device of some embodiments of the present application as an example.

[0178] The electrical device can be used for, but is not limited to, the battery vehicles, vehicle 1000, energy storage equipment, ships, and spacecraft listed above.

[0179] Since the battery device 100 includes all the technical features of the above embodiments, the effects are the same as those described above and will not be described in detail herein.

[0180] For the convenience of explanation, please refer to the following examples. Fig.13 , an energy storage device 2000 of some embodiments of the present application is taken as an example for description.

[0181] The energy storage device 2000 includes a cabinet 2100 and a battery cluster 2200 . The battery cluster 2200 is accommodated in the cabinet 2100 . The battery cluster 2200 includes a plurality of battery devices 100 according to the first aspect.

[0182] The battery cluster 2200 can improve the voltage and capacity of the energy storage device 2000. The battery cluster 2200 may include a plurality of battery devices 100. The plurality of battery devices 100 are connected in series through a busbar to improve the voltage of the energy storage device 2000. When the energy storage device 2000 includes a plurality of battery clusters 2200, the plurality of battery clusters 2200 are connected in parallel to improve the capacity of the energy storage device 2000.

[0183] The energy storage device 2000 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device 2000 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 2000 can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of the energy storage device 2000.

[0184] Since the energy storage device 2000 includes all the technical features of the battery device 100 of the above embodiment, the effects are the same as above and will not be described in detail here.

[0185] In an optional embodiment of the battery device 100, the battery device 100 includes a battery cell assembly and a box assembly 10. The battery cell assembly includes a plurality of battery cells. The box assembly 10 includes a frame 111 and a thermal management component 112. The thermal management component 112 is located at the bottom of the battery cell assembly and is integrally formed with the frame 111 to form a first box. The frame 111 includes a side beam 1110, and the side beam 1110 includes a first side beam 1111, a second side beam 1112, a third side beam 1113 and a fourth side beam 1114 which are connected end to end in sequence. The first side beam 1111 and the second side beam 1112 are arranged at intervals along the first direction, and the third side beam 1113 and the fourth side beam 1114 are arranged at intervals along the second direction. The first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 all have heat exchange flow channels 1116 inside, the first direction and the second direction intersect, and the plane where the first direction and the second direction are located intersects with the height direction of the box assembly 10.

[0186] The first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 all include multi-layer flow channels 1116 arranged at intervals along the height direction of the box assembly 10. The same layer of flow channels 1116 in the first side beam 1111, the second side beam 1112, the third side beam 1113 and the fourth side beam 1114 are connected in series in sequence to form a multi-layer circulation channel surrounding the battery cell assembly. Two adjacent layers of circulation channels are connected in parallel to form a first heat exchange flow channel, and the first heat exchange flow channel is connected in parallel with the heat exchange channel 1121. The circulation channel has a first flow outlet 11161 and a first flow inlet 11162. Along the length direction of the circulation channel, the first flow inlet 11162 and the first flow outlet 11161 are arranged at intervals. There is a blocking portion 1119 in the circulation channel, and the blocking portion 1119 is used to block the circulation channel between the first flow inlet 11162 and the first flow outlet 11161.

[0187] The side beam 1110 also includes a first reinforcement 1117, a second reinforcement 1118 and a blocking portion 1119. The circulation channel has a first flow outlet 11161 and a first flow inlet 11162. Along the length direction of the circulation channel, the first flow inlet 11162 and the first flow outlet 11161 are arranged at intervals. The circulation channel is provided with a blocking portion 1119. The blocking portion 1119 is used to block the circulation channel between the first flow inlet 11162 and the first flow outlet 11161. In the same layer of the circulation channel, the first reinforcement 1117 and the second reinforcement 1118 are respectively provided on both sides of the blocking portion 1119. Along the height direction of the box body, the first reinforcement 1117 and the second reinforcement 1118 respectively penetrate the first wall 11163 between two adjacent layers of flow channels 1116, and along the length direction of the circulating flow channel, the first reinforcement 1117 and the second reinforcement 1118 are arranged at intervals, and a sealing portion 1119 is provided between each layer of flow channels 1116, and the sealing portion 1119 is used to block part of the flow channels 1116 between the first reinforcement 1117 and the second reinforcement 1118, the first reinforcement 1117 has a first cavity inside, and the second reinforcement 1118 has a second cavity inside, and the heat exchange channel 1121 has a first heat exchange outlet and a second heat exchange inlet, the first heat exchange outlet and the multi-layer flow channels 1116 are respectively connected to the first cavity, and the second heat exchange inlet and the multi-layer flow channels 1116 are respectively connected to the second cavity.

[0188] By setting a heat exchange channel 1116 inside the side beam 1110 and connecting the heat exchange channel 1116 with the heat exchange channel 1121 inside the thermal management component 112 to form a heat exchange flow path, the heat exchange area is increased compared to the traditional method of only relying on the water cooling plate and the battery monomer for heat exchange. The larger heat exchange area enables the heat exchange medium to more fully exchange heat with the battery monomer, thereby more efficiently adjusting the temperature of the battery, so that the battery monomer in the battery device 100 can reach the appropriate operating temperature range more quickly, making the performance of the battery device 100 more stable during operation. At the same time, the frame 111 of the box assembly 10 can be fully utilized to design the heat exchange channel 1116 without changing the original space of the box assembly 10 for accommodating the battery monomer assembly, without adding additional heat exchange components to increase the heat exchange area, thereby improving the space utilization of the box assembly 10. By providing the first reinforcement member 1117 and the second reinforcement member 1118 , the strength of the side beam 1110 can be improved, so that the side beam 1110 has good stability when bearing various mechanical stresses during the operation of the battery device 100 .

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells; A box assembly, comprising a frame and a thermal management component, wherein the frame comprises a side beam, the side beam is arranged around the battery cell assembly, the side beam has a heat exchange flow channel inside, the thermal management component is located on one side of the battery cell assembly, the thermal management component is thermally connected to the battery cell assembly, the thermal management component has a heat exchange channel inside, the heat exchange flow channel and the heat exchange channel are respectively configured to pass in and out of a heat exchange medium; The side beams include a first side beam, a second side beam, a third side beam and a fourth side beam which are connected end to end in sequence, the first side beam and the third side beam are arranged at intervals along a first direction, the second side beam and the fourth side beam are arranged at intervals along a second direction, the first side beam, the second side beam, the third side beam and the fourth side beam all have the heat exchange flow channel inside, the first direction and the second direction intersect, and a common plane of the first direction and the second direction intersects with a height direction of the box assembly.

2. The battery device according to claim 1, characterized in that: The heat exchange flow channel is in communication with the heat exchange passage.

3. The battery device according to claim 2, characterized in that: The first side beam, the second side beam, the third side beam and the fourth side beam all include multi-layer flow channels spaced apart along the height direction of the box assembly. In the same side beam, the multi-layer flow channels are connected in series or in parallel to form the heat exchange flow channel. The heat exchange flow channels in the first side beam, the second side beam, the third side beam and the fourth side beam are connected in series in sequence to form a first heat exchange flow channel. The first heat exchange flow channel is connected in series with the heat exchange channel.

4. The battery device according to claim 2, characterized in that: The first side beam, the second side beam, the third side beam and the fourth side beam each include a plurality of flow channels spaced apart in a height direction of the box assembly, and the flow channels in the same layer of the first side beam, the second side beam, the third side beam and the fourth side beam are sequentially connected in series to form a plurality of circulation channels surrounding the battery cell assembly; The two adjacent layers of the circulation channels are connected in parallel to form a first heat exchange channel, and the first heat exchange channel is connected in parallel to the heat exchange channel.

5. The battery device according to claim 4, characterized in that: The circulating channel has a first flow outlet and a first flow inlet. The first flow inlet and the first flow outlet are arranged at intervals along the length direction of the circulating channel. The circulating channel has a blocking portion therein, and the blocking portion is used to block the circulating channel between the first flow inlet and the first flow outlet.

6. The battery device according to any one of claims 4 or 5, characterized in that: The frame also includes a reinforcing beam. There are multiple battery cell assemblies. The reinforcing beam is arranged between two adjacent battery cell assemblies. The heat exchange channel is provided inside the reinforcing beam. The heat exchange channel in the reinforcing beam is connected to the heat exchange channel in the side beam.

7. The battery device according to claim 6, characterized in that: The reinforcing beam has multiple layers of flow paths spaced apart in the height direction of the box assembly. Two adjacent layers of the flow paths are connected in parallel or in series, and both ends of the flow paths in the same layer are respectively connected to the circulating channels in the same layer.

8. The battery device according to claim 3, characterized in that: The thermal management component is located at the bottom of the frame and connected to the frame; The side beam further includes a first reinforcement member, a first wall between two adjacent layers of the flow channels is connected to the first reinforcement member, the first reinforcement member has a first cavity inside, and the two adjacent layers of the flow channels are connected through the first cavity. And / or, the side beam includes a second reinforcement, a second wall is provided between the first heat exchange channel and the heat exchange channel, the second wall is connected to the second reinforcement, a second cavity is provided inside the second reinforcement, and the first heat exchange channel and the heat exchange channel are connected through the second cavity.

9. The battery device according to claim 4, characterized in that: The side beam includes a first reinforcement, a second reinforcement and a blocking portion. Along the height direction of the box body, the first reinforcement and the second reinforcement respectively penetrate the first wall between two adjacent layers of the flow channel. Along the length direction of the circulating flow channel, the first reinforcement and the second reinforcement are arranged at intervals. There is a blocking portion between each layer of the flow channel, and the blocking portion is used to block part of the flow channel between the first reinforcement and the second reinforcement. The first reinforcement has a first cavity inside, and the second reinforcement has a second cavity inside. The heat exchange channel has a first heat exchange outlet and a second heat exchange inlet. The first heat exchange outlet and the multiple layers of the flow channel are respectively connected to the first cavity, and the second heat exchange inlet and the multiple layers of the flow channel are respectively connected to the second cavity.

10. The battery device according to any one of claims 1 to 5, characterized in that: The plurality of battery cells have a plurality of rows, and the thermal management component is disposed between two adjacent rows of battery cells.

11. The battery device according to any one of claims 1 to 5, characterized in that: The thermal management component is located at the bottom of the battery cell assembly, and the thermal management component is connected to the frame to form a first box.

12. The battery device according to claim 10, characterized in that: The frame and the heat management component are integrally formed.

13. The battery device according to claim 12, characterized in that: The thermal management component is a metal part, and the frame is a non-metal part.

14. An electrical device, characterized in that: It comprises a battery device as described in any one of claims 1 to 13, wherein the battery device is used to provide electrical energy to the electrical device.

15. An energy storage device, characterized in that: The invention comprises a cabinet and a battery cluster, wherein the battery cluster is accommodated in the cabinet and comprises a plurality of battery devices according to any one of claims 1 to 13.

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