Box assembly, battery device, energy storage device and power utilization device

Abstract

The embodiment of the utility model provides a box body assembly, a battery device, an energy storage device and a power utilization device. The battery device comprises a battery cell assembly and a box body assembly. A containing cavity is formed in the box body assembly, and the battery monomer assembly is arranged in the containing cavity. The box body assembly comprises a first box body, and the first box body comprises a box main body and a cover plate. The box body comprises a containing space with an opening and side walls, at least part of the containing space is defined by the side walls, and the containing space at least forms part of a containing cavity. The cover plate is arranged at the opening in a covering mode and is a composite plate. The box main body is configured to be injection molded on the cover plate. According to the battery device provided by the embodiment of the invention, the production efficiency and the product quality can be improved, the bonding strength between the box main body and the cover plate can be improved, and the condition that the joint of the box main body and the cover plate cracks can be improved, namely the condition that the cover plate is burst by internal gas can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a box assembly, a battery device, an energy storage device and a power utilization device. BACKGROUND

[0002] This section is intended to provide background or context to the embodiments of the application. The description herein does not constitute admission of prior art.

[0003] In a new energy vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. In related technologies, the structure of the box assembly is relatively complex, generally having a facade structure, and the material of the box assembly is set as SMC material, or is formed by molding a mass and a fiber prepreg, which is prone to cracks in production and assembly. In addition, there is a problem of gas leakage at the corner or protruding structure of the box assembly, which reduces production efficiency and product quality. SUMMARY

[0004] Therefore, the embodiments of the present application aim to provide a box assembly, a battery device, an energy storage device and a power utilization device, which can improve production efficiency and product quality to a certain extent.

[0005] To achieve the above-mentioned purpose, a first aspect of the embodiments of the present application provides a battery device, comprising:

[0006] a box assembly, the box assembly having an accommodation cavity inside;

[0007] a battery monomer assembly, the battery monomer assembly being arranged in the accommodation cavity;

[0008] The box assembly comprises a first box, and the first box comprises:

[0009] a box body, the box body comprising an accommodation space having an opening, the box body comprising a side wall, the side wall surrounding to form at least part of the accommodation space, the accommodation space constituting at least part of the accommodation cavity;

[0010] a cover plate, the cover plate being arranged at the opening, the cover plate being a composite plate; the box body being configured to be injection molded on the cover plate.

[0011] The battery device provided by the embodiments of the present application comprises a box assembly and a battery monomer assembly, the battery monomer assembly is arranged in the accommodating cavity of the box assembly, and the box assembly protects the battery monomer assembly. In a first aspect, the first box is arranged to comprise a box main body and a cover plate, the box main body comprises an accommodating space with an opening, the cover plate is arranged on the opening, that is, the first box is divided into the box main body and the cover plate, the box main body has a side wall, and the side wall surrounds to form at least part of the accommodating space, that is, the box main body is arranged as the main structure of the first box, and the box main body is arranged as an injection molding part, which is beneficial to reducing the molding difficulty of the first box, and can improve the problem of gas leakage at the corner or protruding structure of the first box, thereby being beneficial to improving the production efficiency and product quality. In addition, compared with arranging the box main body as a metal part or a molded part, arranging the box main body as an injection molding part is also beneficial to reducing the weight of the box assembly. In a second aspect, the box main body is formed by injection molding on the cover plate, which is beneficial to improving the bonding strength between the box main body and the cover plate, thereby improving the cracking of the joint between the box main body and the cover plate in the case of pressure difference between the inside and outside of the battery device, that is, the cover plate is prevented from being broken by the internal gas, thereby being able to resist the thermal runaway of the ternary cell or the iron phosphate lithium cell to a certain extent. In a third aspect, the cover plate is arranged as a composite plate, which is beneficial to improving the structural strength of the first box.

[0012] In some embodiments, the composite plate comprises a main body part and a connecting part, the connecting part is arranged around the circumferential side of the main body part, the connecting part is connected with the box main body, and the box main body covers the connecting part.

[0013] In this embodiment, the composite plate is arranged to comprise a main body part and a connecting part, and the connecting part is arranged around the circumferential side of the main body part, that is, the main body part is connected with the box main body through the connecting part, which is beneficial to further improving the bonding strength between the box main body and the cover plate.

[0014] In some embodiments, the composite plate comprises continuous fibers and a matrix, the continuous fibers comprise a wetted area wetted with the matrix and a non-wetted area without the matrix, the wetted area constitutes the main body part, and the non-wetted area constitutes the connecting part.

[0015] In this way, when the box main body is injection molded on the cover plate, the combination between the box main body and the continuous fibers is facilitated, and in the process of injection molding, the injection material of the box main body is mixed with the matrix of the main body part, that is, the box main body and the composite plate form an integrated structure through the melting combination in the process of injection molding, and the continuous fibers of the connecting part at the edge can be wetted by the injection material in the process of injection molding, thereby further improving the bonding strength between the box main body and the continuous fibers.

[0016] In some embodiments, the continuous fibers are continuous fiber cloth.

[0017] In this embodiment, the composite plate is provided to include continuous fibers and a matrix, which is conducive to further improving the strength, heat resistance and weight of the cover plate, and also conducive to reducing the damage caused by thermal runaway of the battery monomer.

[0018] In some embodiments, the continuous fibers are continuous glass fibers.

[0019] Here, the continuous glass fibers are non-metallic materials, have good insulation performance and corrosion resistance, and can improve the insulation performance and corrosion resistance of the cover plate.

[0020] In some embodiments, the distance between the end of the connecting portion away from the main body portion and the main body portion is 2mm-200mm.

[0021] In this embodiment, by setting the distance between the end of the connecting portion away from the main body portion and the main body portion to be 2mm-200mm, the combination between the connecting portion and the box body can be facilitated, and the cost of the first box body can be reduced.

[0022] In some embodiments, the distance between the end of the connecting portion away from the main body portion and the main body portion is 5mm-20mm.

[0023] In this embodiment, by setting the distance between the end of the connecting portion away from the main body portion and the main body portion to be 5mm-20mm, the distance in this range is appropriate, which is conducive to further facilitating the combination between the connecting portion and the box body, and further reducing the cost of the first box body.

[0024] In some embodiments, the box main body is configured to be injection molded on the cover plate by fiber reinforced plastic.

[0025] That is, the box main body includes a fiber reinforced material and a matrix, that is, the box main body is a composite material structure formed by injection molding. Therefore, the box main body also has high strength and deformation resistance, and has certain heat resistance, which is conducive to reducing the damage caused by thermal runaway of the battery monomer.

[0026] In some embodiments, the fiber reinforced plastic is glass fiber reinforced plastic.

[0027] Here, the glass fiber reinforced plastic is a non-metallic material, has good insulation performance and corrosion resistance, and can improve the insulation performance and corrosion resistance of the box main body.

[0028] In some embodiments, the end of the side wall close to the cover plate extends inward to form an end wall, and the end wall surrounds to form the opening.

[0029] In the embodiment, by setting the box body to include an end wall and a side wall, and extending the side wall inward to form the end wall at one end close to the cover plate, the end wall is arranged to form the opening, which is conducive to the connection between the cover plate and the end wall, thereby improving the production efficiency and product quality. In addition, by setting the box body as an injection molding part, it is conducive to improving the problem of air leakage at the connection between the end wall and the side wall.

[0030] In some embodiments, the distance between the end wall close to the opening and the side wall is 0-300mm.

[0031] In the embodiment, by setting the distance between the end wall close to the opening and the side wall to be 0-300mm, the cover plate can have sufficient area, so that the cover plate can be set to improve the strength and heat resistance of the cover plate, which is conducive to reducing the damage caused by the thermal runaway of the battery monomer and facilitating the connection between the cover plate and the end wall.

[0032] In some embodiments, the composite plate includes continuous glass fibers and a first matrix, the box body includes glass fibers and a second matrix, and the first matrix and the second matrix are the same.

[0033] Here, by setting the first matrix of the composite plate and the second matrix of the box body to be consistent, when the box body is injection molded on the cover plate, it is conducive to the fusion bonding between the second matrix of the box body and the first matrix of the composite plate, further improving the bonding strength between the box body and the composite plate.

[0034] The second aspect of the embodiment of the application provides a box assembly, which is the box assembly of the battery device described above, and is used to accommodate the battery monomer assembly.

[0035] The box assembly provided by the embodiments of the present application plays a protective role on the battery monomer assembly. In a first aspect, by setting the first box to include a box body and a cover plate, the box body includes a containing space with an opening, the cover plate is covered on the opening, that is, the first box is split into the box body and the cover plate, the box body has a side wall, the side wall is surrounded to form at least part of the containing space, that is, the box body is set as the main structure of the first box, and the box body is set as an injection molding part, which is conducive to reducing the molding difficulty of the first box, and can improve the problem of gas leakage at the corner or protruding structure position of the first box, thereby being conducive to improving the production efficiency and product quality. In addition, compared with setting the box body as a metal part or a molded part, setting the box body as an injection molding part is also conducive to reducing the weight of the box assembly. In a second aspect, by constructing the box body to be injection molded on the cover plate, it is conducive to improving the bonding strength between the box body and the cover plate, thereby, in the case that there is a pressure difference inside and outside the battery device, the cracking of the joint between the box body and the cover plate can be improved, that is, the cover plate can be prevented from being broken by the internal gas, thereby being able to resist the heat runaway of the ternary cell or the lithium iron phosphate cell to a certain extent. In a third aspect, by setting the cover plate as a composite plate, it is conducive to improving the structural strength of the first box.

[0036] The third aspect of the embodiments of the present application provides a energy storage device, comprising a plurality of the above-mentioned battery devices, the battery devices are used for storing or providing electric energy.

[0037] The battery device of the energy storage device provided by the embodiments of the present application includes a box assembly and a battery monomer assembly, the battery monomer assembly is arranged in the containing cavity of the box assembly, and the box assembly plays a protective role on the battery monomer assembly. In a first aspect, by setting the first box to include a box body and a cover plate, the box body includes a containing space with an opening, the cover plate is covered on the opening, that is, the first box is split into the box body and the cover plate, the box body has a side wall, the side wall is surrounded to form at least part of the containing space, that is, the box body is set as the main structure of the first box, and the box body is set as an injection molding part, which is conducive to reducing the molding difficulty of the first box, and can improve the problem of gas leakage at the corner or protruding structure position of the first box, thereby being conducive to improving the production efficiency and product quality. In addition, compared with setting the box body as a metal part or a molded part, setting the box body as an injection molding part is also conducive to reducing the weight of the box assembly. In a second aspect, by constructing the box body to be injection molded on the cover plate, it is conducive to improving the bonding strength between the box body and the cover plate, thereby, in the case that there is a pressure difference inside and outside the battery device, the cracking of the joint between the box body and the cover plate can be improved, that is, the cover plate can be prevented from being broken by the internal gas, thereby being able to resist the heat runaway of the ternary cell or the lithium iron phosphate cell to a certain extent. In a third aspect, by setting the cover plate as a composite plate, it is conducive to improving the structural strength of the first box.

[0038] A fourth aspect of an embodiment of the present application provides an electrical device comprising a plurality of the battery devices described above, wherein the battery devices are used to store or provide electrical energy.

[0039] The battery device of the electrical device provided in the embodiment of the present application includes a box assembly and a battery cell assembly. The battery cell assembly is arranged in the accommodating cavity of the box assembly, and the box assembly plays a protective role for the battery cell assembly. In the first aspect, by configuring the first box to include a box body and a cover plate, the box body includes a accommodating space with an opening, and the cover plate is arranged at the opening, that is, the first box is split into the box body and the cover plate, the box body has side walls, and the side walls are arranged to form at least part of the accommodating space, that is, the box body is configured as the main structure of the first box body, and the box body is configured as an injection molded part, which is conducive to reducing the molding difficulty of the first box body and can improve the problem of air leakage at the corners or protruding structures of the first box body, thereby facilitating improved production efficiency and product quality. In addition, compared with configuring the box body as a metal part or a molded part, configuring the box body as an injection molded part is also conducive to reducing the weight of the box assembly. Secondly, by constructing the box body as an injection-molded cover, the bonding strength between the box body and the cover is improved. This reduces the risk of cracking at the junction of the box body and the cover when there is a pressure difference between the inside and outside of the battery device, that is, it reduces the risk of the cover being ruptured by internal gas, thereby, to a certain extent, resisting thermal runaway of ternary or lithium iron phosphate cells. Thirdly, by configuring the cover as a composite plate, the structural strength of the first box body is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0041] Figure 2 An exploded view of a battery device provided in one embodiment of the present application;

[0042] Figure 3 A schematic structural diagram of a first box provided in one embodiment of the present application;

[0043] Figure 4 A schematic structural diagram of the first box from another perspective provided in one embodiment of the present application;

[0044] Figure 5 for Figure 4 Cross-sectional view in the AA direction;

[0045] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0046] Figure 7 A schematic structural diagram of a cover plate provided in one embodiment of the present application.

[0047] Reference Signs List

[0048] 10, battery cell assembly; 20, case assembly; 21, first case; 211, case main body; 2111, accommodation space; 2112, opening; 2113, side wall; 2114, end wall; 212, cover plate; 2121, main body part; 2122, connecting part; 22, second case; 100, battery device; 200, controller; 300, motor; 1000, vehicle. DETAILED DESCRIPTION

[0049] If not particularly specified, all the embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0050] If not particularly specified, all the technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0051] With the development of clean energy, more and more devices use electric energy as driving energy, and then as power batteries which can store more electric energy and can be charged and discharged repeatedly, such as lithium ion batteries. Among them, power batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0052] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0053] As an example, the battery cell can also be referred to as an electric core.

[0054] The battery cell 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.

[0055] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator arranged between the positive electrode and the negative electrode can prevent the positive electrode and the negative electrode from short-circuiting, and at the same time allow the active ions to pass through.

[0056] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0057] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two surfaces of the positive electrode current collector.

[0058] As an example, the positive electrode current collector can employ 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, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0059] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used.

[0060] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0061] As an example, the negative electrode current collector can employ 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, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0062] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0063] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0064] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0065] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0066] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0067] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The type of electrolyte is not particularly limited in the present application, and can be selected as desired. The electrolyte can be liquid, gel, or solid.

[0068] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prismatic shape, etc.

[0069] In some embodiments, the electrode assembly is provided with a tab, which can lead current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0070] In some embodiments, the battery cell can include a housing. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing can be a sealed structure, or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing functions to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate the electrode assembly and the electrolyte, etc.

[0071] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), etc., which are not particularly limited in the present application.

[0072] In some embodiments, the housing includes an end cap and a housing body, the housing body is provided with an opening, and the end cap is disposed on the opening. The housing body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0073] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or indirectly connected to the tab through a current collecting member. The electrode terminal can be disposed on the end cap, or on the housing body.

[0074] In the production process of the battery device, the structure of the box assembly is relatively complex, generally having a vertical structure. In the related art, the material of the box assembly is SMC material, or is formed by molding a group material and a fiber prepreg. In production and assembly, cracks are prone to occur. In addition, at the positions of the corners or protruding structures of the box assembly, there is a problem of gas leakage, which reduces the production efficiency and product quality.

[0075] In view of this, in order to improve the production efficiency and product quality, the embodiments of the present application provide a battery device. The battery device comprises a battery cell assembly and a box assembly. The box assembly has a containing cavity inside, and the battery cell assembly is arranged in the containing cavity. The box assembly comprises a first box. The first box comprises a box body and a cover plate. The box body comprises a containing space with an opening. The box body comprises a side wall, and the side wall surrounds to form at least part of the containing space, and the containing space at least constitutes part of the containing cavity. The cover plate is arranged at the opening, and the cover plate is a composite plate. The box body is configured to be injection molded on the cover plate.

[0076] The battery device provided by the embodiments of the present application comprises a box assembly and a battery cell assembly. The battery cell assembly is arranged in the containing cavity of the box assembly, and the box assembly protects the battery cell assembly. In the first aspect, the first box is divided into a box body and a cover plate. The box body comprises a containing space with an opening, and the cover plate is arranged at the opening. The box body has a side wall, and the side wall surrounds to form at least part of the containing space. The box body is arranged as the main structure of the first box, and the box body is arranged as an injection molded part, which is beneficial to reduce the molding difficulty of the first box, improve the problem of gas leakage at the positions of the corners or protruding structures of the first box, and improve the production efficiency and product quality. In addition, compared with arranging the box body as a metal part or a molded part, arranging the box body as an injection molded part is also beneficial to reduce the weight of the box assembly. In the second aspect, the box body is configured to be injection molded on the cover plate, which is beneficial to improve the bonding strength between the box body and the cover plate. Thus, in the case that there is a pressure difference between the inside and outside of the battery device, the cracking of the joint between the box body and the cover plate can be improved, that is, the cover plate can be prevented from being broken by the internal gas, so that the thermal runaway of the ternary cell or the lithium iron phosphate cell can be resisted to a certain extent. In the third aspect, the cover plate is arranged as a composite plate, which is beneficial to improve the structural strength of the first box.

[0077] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.

[0078] Please refer to Figure 1The interior of the vehicle 1000 can be provided with a controller 200, a motor 300, and a battery apparatus 100, the controller 200 being configured to control the battery apparatus 100 to supply power to the motor 300. For example, the battery apparatus 100 can be provided at the bottom or the front or the rear of the vehicle 1000. The battery apparatus 100 can be used to supply power to the vehicle 1000, for example, the battery apparatus 100 can be used as a power source for the operation of the vehicle 1000, for example, for the power demand of the circuit system of the vehicle 1000, for example, for the power demand of the vehicle 1000 during starting, navigation, and operation. In another embodiment of the present application, the battery apparatus 100 can not only be used as a power source for the operation of the vehicle 1000, but also be used as a driving power source for the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0079] The battery apparatus 100 according to an embodiment of the present application comprises a battery cell assembly 10 and a case assembly 20. The case assembly 20 has a receiving cavity inside, and the battery cell assembly 10 is arranged in the receiving cavity. The case assembly 20 comprises a first case 21, and the first case 21 comprises a case main body 211 and a cover plate 212. The case main body 211 comprises a receiving space 2111 having an opening 2112, and the case main body 211 comprises a side wall 2113 surrounding at least part of the receiving space 2111 to form at least part of the receiving cavity. The cover plate 212 is arranged at the opening 2112, and the cover plate 212 is a composite plate. The case main body 211 is configured to be injection molded on the cover plate 212.

[0080] The battery apparatus 100 according to an embodiment of the present application can comprise one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 can comprise a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar.

[0081] In some embodiments, the battery cell assembly 10 is generally formed by arranging a plurality of battery cells.

[0082] As an example, the battery cell assembly 10 can be a battery module formed by arranging and fixing a plurality of battery cells into a separate module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0083] In some embodiments, the battery apparatus 100 can be a battery pack comprising a case assembly 20 and one or more battery cell assemblies 10, and the battery cell assemblies 10 are arranged in the case assembly 20.

[0084] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be accommodated in the box assembly 20 by fixing the battery module in the box assembly 20.

[0085] As an example, the battery cell assembly 10 can also be accommodated in the box assembly 20 by fixing a plurality of battery cells directly to the box assembly 20.

[0086] As an example, please refer to Figure 2 and Figure 3 The box assembly 20 can include a first box 21 and a second box 22. The first box 21 and the second box 22 are buckled so that a closed space is formed inside the box assembly 20 to accommodate the battery cell assembly 10. Here, closed means covered or closed, which can be sealed or unsealed. The first box 21 can be an upper cover or a lower box. In the embodiments of the present application, the first box 21 is taken as an example to describe the upper cover.

[0087] In some embodiments, the box assembly 20 can be part of the chassis structure of the vehicle 1000. For example, part of the box assembly 20 can become at least part of the floor of the vehicle 1000, or part of the box assembly 20 can become at least part of the cross beam and longitudinal beam of the vehicle 1000.

[0088] Please refer to Figures 4 to 7 The first box 21 includes a box body 211 and a cover plate 212, and the cover plate 212 is arranged at the opening 2112, that is, the first box 21 is generally in the form of a cover. By splitting the first box 21 into the box body 211 and the cover plate 212, it is beneficial to reduce the difficulty of forming the first box 21, thereby improving the production efficiency and product quality.

[0089] Here, the first box 21 is a vertical structure, and it should be noted that the vertical structure is relative to the flat structure, that is, the vertical structure is a structure that constitutes a certain space inside, for example, the box body 211 includes a containing space 2111 with an opening 2112. The cover plate 212 is a flat structure, which is relatively easy to form.

[0090] Please refer to Figures 5 to 6 The box body 211 includes a side wall 2113, and the side wall 2113 surrounds to form at least part of the containing space 2111, that is, the box body 211 is, for example, a vertical structure. By making the box body 211 an injection molding part, it is beneficial to improve the problem of air leakage at the position of the corner or protruding structure of the first box 21.

[0091] It should be noted that the specific type of the cover plate 212 is not limited here.

[0092] In some embodiments, referring to Figure 7 The cover plate 212 is a composite plate.

[0093] Here, the composite plate is a composite plate formed by using fiber reinforced material, for example. The composite plate has high strength and deformation resistance, and also has certain heat resistance, which is conducive to reducing damage caused by thermal runaway of the battery cell.

[0094] Illustratively, the cover plate 212 can be formed by molding a fiber preform.

[0095] Compared with the first box 21 whose entire structure is a composite plate formed by molding, by setting the box body 211 as an injection molded part and setting the cover plate 212 as a composite plate, it is conducive to improving the problem of air leakage at the position of the corner or protruding structure of the first box 21, and also conducive to reducing weight and cost, improving production efficiency and product quality.

[0096] Compared with the first box 21 whose entire structure is a plastic part, by setting the box body 211 as an injection molded part and setting the cover plate 212 as a composite plate, it is conducive to improving the strength and heat resistance of the cover plate 212, and also conducive to reducing damage caused by thermal runaway of the battery cell.

[0097] Compared with the first box 21 whose entire structure is a metal part, by setting the box body 211 as an injection molded part and setting the cover plate 212 as a composite plate, it is conducive to reducing weight and cost.

[0098] Here, by setting the box body 211 as an injection molded part, the weight and production cost are reduced, the production efficiency and product quality are improved, and the composite plate has certain buffering performance; by setting the cover plate 212 as a composite plate, it is conducive to improving the strength and heat resistance of the cover plate 212, and also conducive to reducing damage caused by thermal runaway of the battery cell. The first box 21 in this embodiment has the advantages of both types of structural parts, has certain strength and deformation resistance, and also has certain heat resistance, thereby reducing the weight and production cost of the first box 21.

[0099] Here, by constructing the box body 211 as an injection molded part on the cover plate 212, that is, by placing the formed cover plate 212 into the mold of the box body 211, then injecting the injection material of the box body 211 into the mold, and then integrally forming the first box 21, it is conducive to improving the bonding strength between the box body 211 and the cover plate 212.

[0100] The battery device 100 provided by the embodiments of the present application comprises a box assembly 20 and a battery monomer assembly 10, the battery monomer assembly 10 is arranged in the accommodating cavity of the box assembly 20, and the box assembly 20 plays a protection role on the battery monomer assembly 10. In the first aspect, the first box 21 is arranged to comprise a box main body 211 and a cover plate 212, the box main body 211 comprises an accommodating space 2111 with an opening 2112, the cover plate 212 is arranged at the opening 2112, that is, the first box 21 is split into the box main body 211 and the cover plate 212, the box main body 211 has a side wall 2113, and the side wall 2113 is arranged to form at least part of the accommodating space 2111, that is, the box main body 211 is arranged as the main structure of the first box 21, and the box main body 211 is arranged as an injection molding part, which is beneficial to reduce the molding difficulty of the first box 21 and can improve the problem of gas leakage at the corner or protruding structure of the first box 21, thereby being beneficial to improve the production efficiency and product quality, in addition, compared with arranging the box main body 211 as a metal part or a molded part, arranging the box main body 211 as an injection molding part is also beneficial to reduce the weight of the box assembly 20. In the second aspect, the box main body 211 is constructed to be injection molded on the cover plate 212, which is beneficial to improve the bonding strength between the box main body 211 and the cover plate 212, so that in the case that there is a pressure difference inside and outside the battery device 100, the cracking of the joint between the box main body 211 and the cover plate 212 can be improved, that is, the cover plate 212 can be prevented from being broken by the internal gas, thereby being able to resist the heat runaway of the ternary cell or the lithium iron phosphate cell to a certain extent. In the third aspect, the cover plate 212 is arranged as a composite plate, which is beneficial to improve the structural strength of the first box 21.

[0101] In some embodiments, referring to Figure 7 , the composite plate comprises a main body part 2121 and a connecting part 2122, the connecting part 2122 is arranged around the circumferential side of the main body part 2121, the connecting part 2122 is connected with the box main body 211, and the box main body 211 covers the connecting part 2122.

[0102] Here, the circumferential side of the main body part 2121 can be arranged around a whole circle of the connecting part 2122, or part of the circumferential side of the main body part 2121 can be arranged around the connecting part 2122.

[0103] Here, the structure of the main body part 2121 and the connecting part 2122 can be consistent or different.

[0104] The box main body 211 covers the connecting part 2122, that is, the joint between the box main body 211 and the cover plate 212 covers the connecting part 2122, so as to be beneficial to further improve the bonding strength between the box main body 211 and the cover plate 212.

[0105] In this embodiment, by setting the composite plate to include the main body part 2121 and the connecting part 2122, the connecting part 2122 is arranged around the circumference of the main body part 2121, that is, the main body part 2121 is connected with the box main body 211 through the connecting part 2122, which is conducive to further improving the bonding strength between the box main body 211 and the cover plate 212.

[0106] In some embodiments, referring to Figures 5 to 7 , the composite plate includes continuous fibers and a matrix, the continuous fibers include a wetted area wetted with the matrix and a non-wetted area without the matrix, the wetted area constitutes the main body part 2121, and the non-wetted area constitutes the connecting part 2122.

[0107] That is, the continuous fibers of the wetted area are wetted with the matrix, and the continuous fibers of the non-wetted area are not wetted with the matrix. In this way, when the box main body 211 is injection molded on the cover plate 212, the bonding between the box main body 211 and the continuous fibers is facilitated, and during the injection molding process, the injection material of the box main body 211 will intermingle with the matrix of the main body part 2121, that is, the box main body 211 and the composite plate form an integrated structure through the molten bonding during the injection molding process, and the continuous fibers of the connecting part 2122 at the edge can be wetted with the injection material during the injection molding process, further improving the bonding strength between the box main body 211 and the continuous fibers.

[0108] It can be understood that the continuous fibers can endow the matrix resin with synergistic mechanical properties, such as high modulus, high strength, and high toughness, thereby facilitating the improvement of the structural strength of the composite plate.

[0109] It should be noted that the specific type of the matrix is not limited here. The appropriate type of matrix can be selected according to the specific circumstances.

[0110] In some embodiments, the first matrix is a thermoplastic resin.

[0111] Here, the matrix is, for example, a thermoplastic resin, which has the performance of softening when heated and hardening when cooled, and does not react chemically, and can maintain this performance no matter how many times heating and cooling are repeated. The thermoplastic resin has good toughness, large damage tolerance, good dielectric constant, unlimited storage period, no need for low-temperature storage, no need for large special equipment such as heat press tank for molding, and especially has good recyclability, recyclability, reusability, and non-pollution characteristics, which adapts to the current material environmental development direction.

[0112] Exemplarily, in the process of forming the composite plate, the continuous fibers of the connecting portion 2122 can be shielded first, and then the continuous fibers are infiltrated, and the composite plate is obtained after cooling and forming; the composite plate is placed in the injection mold of the first box body 21; the mold is closed, and the injection material of the box body 211 is injected into the mold cavity; the mold is cooled and shaped; the mold is opened and ejected, and the manufacturing of the first box body 21 is completed.

[0113] In some embodiments, referring to Figure 7 , the continuous fibers are continuous fiber cloth.

[0114] Here, the continuous fiber cloth can be woven by continuous fibers.

[0115] In this embodiment, the composite plate is provided with continuous fibers and a matrix, which is conducive to further improving the strength, heat resistance and weight of the cover plate 212, and also conducive to reducing damage caused by thermal runaway of the battery monomer.

[0116] In some embodiments, the continuous fibers are continuous glass fibers.

[0117] Here, the continuous glass fibers are non-metallic materials, have good insulation performance, are corrosion-resistant, and can improve the insulation performance and corrosion resistance of the cover plate 212.

[0118] In some embodiments, referring to Figures 5 to 7 , the distance between the end of the connecting portion 2122 away from the main body portion 2121 and the main body portion 2121 is 2mm-200mm. That is, the length of the connecting portion 2122 is 2mm-200mm.

[0119] The distance between the end of the connecting portion 2122 away from the main body portion 2121 and the main body portion 2121 can be 2mm, 2.5mm, 3mm, 5mm, 7mm, 8mm, 9mm, 10mm, 18mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, or any point value between any two of them.

[0120] In this embodiment, by setting the distance between the end of the connecting portion 2122 away from the main body portion 2121 and the main body portion 2121 to be 2mm-200mm, the combination between the connecting portion 2122 and the box body can be facilitated, and the cost of the first box body 21 can be reduced.

[0121] In some embodiments, referring to Figures 4 to 7The distance between the end of the connecting portion 2122 away from the main body portion 2121 and the main body portion 2121 can be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, or any point value between any two of them.

[0122] The distance between the end of the connecting portion 2122 away from the main body portion 2121 and the main body portion 2121 can be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, or any point value between any two of them.

[0123] In this embodiment, by setting the distance between the end of the connecting portion 2122 away from the main body portion 2121 and the main body portion 2121 to be 5 mm-20 mm, the distance in this range is appropriate, which is further conducive to realizing the combination between the connecting portion 2122 and the box body, while further reducing the cost of the first box body 21.

[0124] In some embodiments, referring to Figures 5 to 7 The box body 211 is configured to be injection molded on the cover plate 212 by fiber reinforced plastic.

[0125] That is, the box body 211 includes a fiber reinforced material and a matrix, that is, the box body 211 is a composite material structure formed by injection molding. Therefore, the box body 211 also has high strength and deformation resistance, and has certain heat resistance, which is conducive to reducing damage caused by thermal runaway of the battery monomer.

[0126] In some embodiments, the fiber reinforced plastic is glass fiber reinforced plastic.

[0127] Here, the glass fiber reinforced plastic is a non-metallic material, has good insulation performance and corrosion resistance, and can improve the insulation performance and corrosion resistance of the box body 211.

[0128] For example, the glass fiber reinforced plastic includes an ablation-resistant glass fiber reinforced material.

[0129] Specifically, for example, PP-GF or PPE-GF.

[0130] Polypropylene, abbreviated as PP, is a colorless, odorless, non-toxic, translucent solid substance. Polypropylene is a kind of excellent thermoplastic synthetic resin, which is a colorless translucent thermoplastic lightweight general-purpose plastic; polyphenylene ether, abbreviated as PPE, is a kind of thermoplastic resin with high temperature resistance, and is also a kind of thermoplastic engineering plastic with excellent comprehensive performance.

[0131] Exemplarily, the glass fiber in the fiber reinforced plastic is a discontinuous fiber, which is beneficial to enable the box body 211 to play a heat insulation role on the high-temperature gas generated when the battery monomer assembly 10 is in thermal runaway.

[0132] Here, the first box body 21 is composed of an ablation-resistant material, for example, the first box body 21 foams, expands, carbonizes or solidifies at a preset temperature in the range of 300°-2000°. In this way, when the internal thermal runaway of the battery device 100 occurs, high-temperature gas is generated, and due to the heating effect of the high-temperature gas, the first box body 21 foams, expands, carbonizes or solidifies, playing a heat insulation role, that is, the first box body 21 can play a heat insulation role on the high-temperature gas, avoiding excessive heat transfer to the top composite plate, keeping the composite plate at a lower temperature, which is beneficial to reduce the influence of high temperature on the strength of the composite plate, thereby improving the situation that the first box body 21 is broken by the internal gas under the condition that there is a large pressure difference between the inside and outside of the battery device 100, and further improving the thermal runaway resistance of the first box body 21. At the same time, since the cover plate 212 includes a large amount of continuous fibers, the continuous fibers have high strength below 500°C.

[0133] In some embodiments, referring to Figures 5 to 7 , the side wall 2113 extends inwardly at one end close to the cover plate 212 to form an end wall 2114, and the end wall 2114 surrounds to form the opening 2112.

[0134] The side wall 2113 extends inwardly at one end close to the cover plate 212 to form an end wall 2114, that is, the side wall 2113 has a ring of end walls 2114 at one end close to the cover plate 212, and the end walls 2114 surround to form the opening 2112, that is, the cover plate 212 is connected with the end wall 2114.

[0135] Here, the end wall 2114 and the side wall 2113 have a certain included angle, and thus by setting the box body 211 as an injection molding part, it is beneficial to improve the problem of air leakage at the connection between the end wall 2114 and the side wall 2113.

[0136] In this embodiment, by setting the box body to include the end wall 2114 and the side wall 2113, and extending the side wall 2113 inwardly at one end close to the cover plate 212 to form the end wall 2114, the end wall 2114 surrounds to form the opening 2112, which is beneficial to the connection between the cover plate 212 and the end wall 2114, thereby improving the production efficiency and product quality, and in addition, by setting the box body 211 as an injection molding part, it is beneficial to improve the problem of air leakage at the connection between the end wall 2114 and the side wall 2113.

[0137] In other embodiments, the box body can also not be provided with the end wall 2114, and the cover plate 212 is connected with the end of the box body.

[0138] In some embodiments, see Figures 5 to 7 The distance between the end of the end wall 2114 close to the opening 2112 and the side wall 2113 is 0-300 mm.

[0139] The distance between the end of the end wall 2114 close to the opening 2112 and the side wall 2113 can be any one of 0.5mm, 1mm, 1.5mm, 2mm, 3mm, 5mm, 7mm, 8mm, 9mm, 10mm, 18mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 200mm, 220mm, 240mm, 250mm, 270mm, 280mm, 300mm or any value between any two of them.

[0140] Here, the distance between the end of the end wall 2114 close to the opening 2112 and the side wall 2113 is the inward extension dimension of the end wall 2114 .

[0141] In this embodiment, by setting the distance between the end of the end wall 2114 close to the opening 2112 and the side wall 2113 to 0-300 mm, the cover plate 212 can have a sufficient area, so that the strength and heat resistance of the cover plate 212 can be improved by setting the cover plate 212, which is beneficial to reducing the damage caused by thermal runaway of the battery cell and is also beneficial to the connection between the cover plate 212 and the end wall 2114.

[0142] In some embodiments, see Figure 3 The composite plate includes continuous glass fibers and a first matrix, and the box body 211 includes glass fibers and a second matrix, and the first matrix and the second matrix are the same.

[0143] Here, by setting the first substrate of the composite plate and the second substrate of the box body 211 to be consistent, when the box body 211 is injection molded on the cover plate 212, it is beneficial to melt and bond the second substrate of the box body 211 and the first substrate of the composite plate, further improving the bonding strength between the box body 211 and the composite plate.

[0144] It should be noted that the distance between the end of the connecting portion 2122 away from the main body 2121 and the main body 2121 can be measured by a vernier caliper before being connected to the box body 211; the distance between the end of the end wall 2114 close to the opening 2112 and the side wall 2113 can be measured by a vernier caliper after the first box body 21 is formed; it should be noted that the above measurements can all be carried out at normal temperature and pressure.

[0145] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, and the like made within the principle and technical scope of the present application are included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A box assembly, wherein the box assembly has a receiving cavity inside; a battery cell assembly, wherein the battery cell assembly is disposed in the accommodating cavity; The box assembly includes a first box, and the first box includes: A box body, the box body including a receiving space with an opening, the box body including side walls, the side walls enclosing at least a portion of the receiving space, and the receiving space constituting at least a portion of the receiving cavity; A cover plate is provided at the opening, and the cover plate is a composite plate; the box body is structured by injection molding on the cover plate.

2. The battery device according to claim 1, wherein: The composite plate includes a main body and a connecting portion. The connecting portion is arranged around the circumference of the main body, the connecting portion is connected to the box body, and the box body covers the connecting portion.

3. The battery device according to claim 2, characterized in that The composite plate includes continuous fibers and a matrix. The continuous fibers include a wetted area wetted with the matrix and a non-wetted area without the matrix. The wetted area constitutes the main body, and the non-wetted area constitutes the connecting part.

4. The battery device according to claim 3, characterized in that The continuous fibers are continuous fiber cloth.

5. The battery device according to claim 3, wherein: The continuous fibers are continuous glass fibers.

6. The battery device according to claim 2, wherein: The distance between the end of the connecting portion away from the main body and the main body is 2 mm to 200 mm.

7. The battery device according to claim 6, characterized in that The distance between the end of the connecting portion away from the main body and the main body is 5 mm to 20 mm.

8. The battery device according to any one of claims 1 to 7, characterized in that: The box body is constructed by injection molding fiber-reinforced plastic on the cover plate.

9. The battery device according to claim 8, characterized in that The fiber reinforced plastic is glass fiber reinforced plastic.

10. The battery device according to any one of claims 1 to 7, characterized in that: One end of the side wall close to the cover plate extends inwardly to form an end wall, and the end wall surrounds the opening.

11. The battery device according to claim 10, characterized in that The distance between the end of the end wall close to the opening and the side wall is 0-300 mm.

12. The battery device according to claim 1, wherein: The composite plate includes continuous glass fibers and a first matrix, the box body includes glass fibers and a second matrix, and the first matrix and the second matrix are identical.

13. A box assembly, characterized in that: The box assembly is the box assembly of the battery device according to any one of claims 1 to 12, and the box assembly is used to accommodate the battery cell assembly.

14. An energy storage device, characterized in that: The invention comprises a plurality of battery devices according to any one of claims 1 to 12, wherein the battery devices are used to store or provide electrical energy.

15. An electrical device, characterized in that: The invention comprises a plurality of battery devices according to any one of claims 1 to 12, wherein the battery devices are used to store or provide electrical energy.

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