Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a box body and a battery monomer, and the battery monomer is accommodated in the box body. The box body comprises a first wall, the first wall comprises a fiber fabric, unidirectional fibers and a thermoplastic resin piece, the fiber fabric comprises first fibers and second fibers, the first fibers and the second fibers intersect in the extending direction and are woven with each other, and the fiber fabric and the unidirectional fibers are arranged in a stacked mode in the thickness direction of the first wall. The thermoplastic resin part is connected with the fiber fabric and the unidirectional fibers, the first wall comprises a first part, a second part and a transition connecting part, the first part and the second part intersect, the transition connecting part is connected with the first part and the second part, and at least the transition connecting part is provided with the fiber fabric. According to the battery device provided by the invention, the shear strength between different layers of the first wall is favorably improved, pores in the first wall are reduced, the compactness of the first wall is improved, and the sealing performance of the box body and the reliability of the battery device are further favorably improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, reliability is also a crucial consideration. Therefore, improving the reliability of battery devices is a continuous challenge in battery device technology. Utility Model Content

[0004] This application provides a battery device and an electrical device that improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, the battery device provided in the embodiments of this application includes a housing and a battery cell, with the battery cell housed within the housing. The housing includes a first wall, which comprises a fiber fabric, unidirectional fibers, and a thermoplastic resin component. The fiber fabric includes a first fiber and a second fiber, the extension directions of which intersect and are woven together. The fiber fabric and the unidirectional fibers are layered along the thickness direction of the first wall, and the thermoplastic resin component connects the fiber fabric and the unidirectional fibers. The first wall includes a first portion, a second portion, and a transition connecting portion. The first portion and the second portion intersect, and the transition connecting portion connects the first portion and the second portion. At least the transition connecting portion is provided with fiber fabric.

[0007] The battery device provided in this application embodiment, by providing at least a transition connection portion of the first wall of the housing comprising fiber fabric, unidirectional fibers, and thermoplastic resin components, is beneficial to improving the shear strength between different layers of the at least transition connection portion of the first wall, as well as the overall structural strength of the transition connection portion. Furthermore, during the molding process of the transition connection portion, the first and second fibers in the fiber fabric can mutually restrain each other, exhibiting high conformability and facilitating the formation of an arc-shaped structure in the transition connection portion. This helps reduce the risk of loosening of the unidirectional fibers in the transition connection portion, and the fiber fabric can promote the flow of the thermoplastic resin components in the transition connection portion, thereby reducing the risk of porosity in the transition connection portion, improving the density and structural strength of the transition connection portion, reducing the risk of sealing failure in the transition connection portion, and thus improving the sealing performance of the housing. Therefore, this contributes to improving the reliability of the battery device.

[0008] According to some embodiments of this application, the first wall includes at least two layers of unidirectional fibers, with a fiber fabric sandwiched between the at least two layers of unidirectional fibers.

[0009] In the above scheme, by setting the fiber fabric to have unidirectional fibers on both sides along the thickness direction, the thermoplastic resin parts on both sides along the thickness direction of the fiber fabric can impregnate the fiber fabric during the molding process. This is beneficial to improve the wettability of the thermoplastic resin parts to the fiber fabric, thereby improving the density of the first wall and reducing the risk of pores appearing inside the first wall, which may affect the airtightness or structural strength of the first wall.

[0010] According to some embodiments of this application, at least two layers of unidirectional fibers are provided on at least one side of the fiber fabric along the thickness direction, and the extension directions of the at least two layers of unidirectional fibers on the same side of the thickness direction of the fiber fabric intersect.

[0011] In the above scheme, by setting the extension directions of the two layers of unidirectional fibers on the same side to intersect, it is beneficial to improve the load-bearing capacity of the first wall in at least two directions perpendicular to the two layers of unidirectional fibers. In this way, it is beneficial to improve the overall load-bearing capacity of the first wall, and thus to improve the structural strength of the first wall.

[0012] According to some embodiments of this application, at least two layers of unidirectional fibers are provided on both sides of the fiber fabric along the thickness direction, and the extension directions of the at least two layers of unidirectional fibers on either side of the fiber fabric along the thickness direction are perpendicular to each other.

[0013] The above scheme is conducive to improving the load-bearing capacity of the first wall in both the forward direction of the battery device and the direction perpendicular to the forward direction, which in turn helps to further improve the reliability of the battery device.

[0014] According to some embodiments of this application, the extension directions of the first fiber and the second fiber are perpendicular to each other.

[0015] The above scheme is conducive to improving the overall load-bearing capacity of the battery device, and further conducive to improving the reliability of the battery device.

[0016] According to some embodiments of this application, a first fiber extends along a first direction, and a second fiber extends along a second direction, with the first direction, the second direction, and the thickness direction being perpendicular to each other. At least one side of the fiber fabric along the thickness direction is provided with unidirectional fibers extending along the first direction and unidirectional fibers extending along the second direction.

[0017] In the above scheme, the first direction can be set to be parallel to the forward direction of the battery device, and the second direction can be set to be perpendicular to the forward direction of the battery device, so that the first wall has a greater load-bearing capacity both along the forward direction of the battery device and perpendicular to the forward direction of the battery device, which is conducive to further improving the overall load-bearing capacity of the battery device and further improving the reliability of the battery device.

[0018] According to some embodiments of this application, the enclosure includes a main body and a cover, the cover is disposed on the main body, the battery cell is connected to the main body, and the cover includes a first wall.

[0019] In the above scheme, the cover includes a first wall, which is beneficial to both meeting the load-bearing requirements of the cover and reducing its weight.

[0020] According to some embodiments of this application, the thermoplastic resin part includes polypropylene, nylon, polyphenylene ether, or polyethylene terephthalate.

[0021] The above solution not only improves the ease of processing the casing, but also helps to reduce the production cost of the battery device.

[0022] According to some embodiments of this application, the areal density ρ of the fiber fabric s Satisfying: 200g / m 2 ≤ρ s ≤600g / m 2 .

[0023] In the above scheme, by setting 200g / m 2 ≤ρ s ≤600g / m 2 This is beneficial for improving the ability of the fiber fabric to absorb the gap deviation of the mold during the molding process, which in turn helps to improve the structural stability of the first wall after molding. At the same time, it also helps to improve the wettability of the thermoplastic resin part to the fiber fabric and improve the density of the first wall.

[0024] Secondly, the electrical device provided in the embodiments of this application includes the battery device provided in any of the above embodiments, and the battery device is used to provide electrical energy.

[0025] The electrical device provided in this application embodiment has the same technical effect as the battery device provided in this application embodiment, and will not be described again here.

[0026] According to some embodiments of this application, the first fiber extends along a first direction, the second fiber extends along a second direction, the first direction, the second direction and the thickness direction are perpendicular to each other, and the first direction is the forward direction of the electrical device.

[0027] The above scheme is conducive to improving the load-bearing capacity of the first wall in both the direction of the electrical device's movement and the direction perpendicular to the direction of movement, and further conducive to improving the reliability of the electrical device.

[0028] According to some embodiments of this application, the first wall includes at least two layers of unidirectional fibers, at least one layer of unidirectional fibers extending along a first direction, and at least another layer of unidirectional fibers extending along a second direction.

[0029] The above scheme is conducive to further improving the load-bearing capacity of the first wall along the direction of the electrical device's movement and perpendicular to the direction of movement, and further conducive to improving the reliability of the electrical device.

[0030] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of the battery device provided in the embodiments of this application;

[0034] Figure 3 This is a schematic diagram of the structure of a battery cell assembly in a battery device provided in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell in a battery device provided in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the structure of the first wall in the battery device provided in the embodiments of this application;

[0037] Figure 6 A top view of the first wall in the battery device provided in the embodiments of this application;

[0038] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure along AA;

[0039] Figure 8A schematic diagram of the structure of the first wall in the battery device provided in the embodiments of this application during the production process of fiber fabric and unidirectional fiber layup;

[0040] Figure 9 A schematic diagram of the unidirectional fiber structure of the first wall in the battery device provided in the embodiments of this application;

[0041] Figure 10 This is a schematic diagram of the structure of the fiber fabric of the first wall in the battery device provided in the embodiment of this application.

[0042] The accompanying drawings are not necessarily drawn to scale.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1-Vehicle; 1a-Motor; 1b-Controller;

[0045] 10-Battery assembly; 11-Box housing; 111-Box body; 112-Lid;

[0046] 20-Battery cell module;

[0047] 30-Battery cell; 31-Casing; 311-Housing shell; 312-End cap; 32-Electrode assembly; 321-Electrode body; 322-Taper; 33-Electrode terminal;

[0048] 40 - First wall; 41 - Fiber fabric; 411 - First fiber; 412 - Second fiber; 42 - Unidirectional fiber; 43 - Thermoplastic resin part; 40a - First part; 40b - Second part; 40c - Transition connection part;

[0049] X - First direction; Y - Second direction; Z - Thickness direction. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0052] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0056] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0057] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0058] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0059] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0060] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0061] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0062] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0063] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0064] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0065] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0066] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0067] In some embodiments, the housing includes an end cap and a shell, the shell having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The shell may have one or more openings. The end cap may also be provided one or more times.

[0068] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0069] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0070] 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. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0071] In related technologies, to reduce the weight of the battery pack casing, at least part of the casing walls, such as the cover, are typically made of composite materials. This ensures sufficient structural strength while effectively reducing the weight of the casing, thus achieving lightweighting of the battery pack. Some composite materials are molded using thermoplastic processes. Specifically, thermoplastic resin is pre-impregnated into fibers and cured to form a prefabricated sheet. Because thermoplastic resin is recyclable and can be repeatedly reheated and reshaped, the prefabricated sheet can be reheated and shaped in a specific mold during casing processing to achieve the desired casing shape.

[0072] When thermoplastic processing is used to manufacture the housing, the fibers in the composite material of the housing are usually unidirectional fibers. During the molding process, since there is no restraint between the unidirectional fibers, the unidirectional fibers are more sensitive to the gap between the upper and lower molds. If the gap between the upper and lower molds is large, the unidirectional fibers after molding will have large gaps, resulting in low density of the housing wall, forming obvious textures and pores. This seriously affects the sealing performance of the housing, and thus affects the reliability of the battery device.

[0073] In view of this, the battery device provided in the embodiments of this application includes a housing and a battery cell, with the battery cell housed in the housing. The housing includes a first wall, which includes a fiber fabric, unidirectional fibers, and a thermoplastic resin component. The fiber fabric includes a first fiber and a second fiber, the extension directions of which intersect and are woven together. The fiber fabric and the unidirectional fibers are stacked along the thickness direction of the first wall, and the thermoplastic resin component connects the fiber fabric and the unidirectional fibers.

[0074] The battery device provided in this application embodiment, by setting the first wall of the housing to include fiber fabric, unidirectional fibers and thermoplastic resin parts, is beneficial to improving the shear strength between different layers of the first wall and the overall structural strength of the first wall, reducing the risk that some unidirectional fibers of the first wall may become loose and affect the structural strength of the first wall, and also beneficial to reducing the porosity inside the first wall, improving the compactness of the first wall, and thus improving the sealing performance of the housing. In this way, it is beneficial to improve the reliability of the battery device.

[0075] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0076] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0077] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0078] For ease of explanation, the following embodiments will be described using a vehicle 1 as an example of an electrical device according to an embodiment of this application.

[0079] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1.

[0080] The vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0081] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0082] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in the embodiments of this application. Figure 3 This is a schematic diagram of the structure of the battery cell assembly 20 in the battery device 10 provided in this application embodiment. The battery device 10 includes a housing 11 and battery cells 30, with the battery cells 30 housed within the housing 11. The housing 11 provides a space for the battery cells 30, and can adopt various structures. In some embodiments, the housing 11 may include a housing body 111 and a cover 112, which cover each other, defining a space for accommodating the battery cells 30. The cover 112 may be a hollow structure with one open end, and the housing body 111 may be a plate-like structure, with the cover 112 covering the open side of the housing body 111, so that the housing body 111 and the cover 112 together define the space. Alternatively, the housing body 111 and the cover 112 may both be hollow structures with one open side, with the open side of the housing body 111 covering the open side of the cover 112.

[0083] In the battery device 10, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 30 are connected in both series and parallel configurations. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 30 is housed within the housing 11. Alternatively, the battery device 10 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed manner to form a battery cell assembly 20, and then the multiple battery cell assemblies 20 are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0084] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0085] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a single battery cell 30 in the battery device 10 provided in an embodiment of this application. Figure 4As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals 33. The housing 31 includes a casing 311 and an end cap 312. The casing 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0086] The housing 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can accommodate the electrode assembly 32, electrolyte, and other components. The housing 311 and the end cap 312 can be independent components. The housing 311 can have various shapes and sizes. Specifically, the shape of the housing 311 can be determined according to the specific shape and size of the electrode assembly 32. The housing 311 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0087] End cap 312 refers to a component that covers the opening of housing 311 to isolate the internal environment of battery cell 30 from the external environment. The shape of end cap 312 can be adapted to the shape of housing 311 to fit it. Optionally, end cap 312 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 312 is not easily deformed under pressure and impact, giving battery cell 30 higher structural strength and improved reliability. Functional components such as electrode terminals 33 can be provided on end cap 312. Electrode terminals 33 can be used for electrical connection with electrode assembly 32 to output or input electrical energy to battery cell 30. The material of end cap 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 312. The insulating structure can be used to isolate the electrical connection components within the housing 311 from the end cap 312 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0088] Electrode assembly 32 is the component in the battery cell 30 where electrochemical reactions occur. The housing 311 may contain one or more electrode assemblies 32. The electrode assembly 32 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates to separate them and prevent internal short circuits. The portions of the positive and negative electrode plates containing active material constitute the electrode body 321 of the electrode assembly 32, while the portions of the positive and negative electrode plates without active material each constitute a tab 322. The positive and negative tabs may be located together at one end of the electrode body 321 or separately at both ends of the electrode body 321. During the charging and discharging process of the battery cell 30, the positive and negative active materials react with the electrolyte, and the tabs 322 connect to the electrode terminals 33 to form a current loop.

[0089] Firstly, such as Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the battery device 10 provided in this embodiment includes a housing 11 and a battery cell 30, with the battery cell 30 housed within the housing 11. The housing 11 includes a first wall 40, which comprises a fiber fabric 41, unidirectional fibers 42, and a thermoplastic resin component 43. The fiber fabric 41 includes a first fiber 411 and a second fiber 412, the extension directions of which intersect and are woven together. The fiber fabric 41 and the unidirectional fibers 42 are stacked along the thickness direction Z of the first wall 40. The thermoplastic resin component 43 connects the fiber fabric 41 and the unidirectional fibers 42. The first wall 40 includes a first portion 40a, a second portion 40b, and a transition connecting portion 40c. The first portion 40a and the second portion 40b intersect, and the transition connecting portion 40c connects the first portion 40a and the second portion 40b. At least the transition connecting portion 40c is provided with the fiber fabric 41.

[0090] The housing 11 may include a housing body 111 and a cover 112. The cover 112 covers the housing body 111 to define a space for accommodating the battery cells 30. The battery cells 30 are connected inside the housing body 111 to provide greater load-bearing capacity for the battery cells 30. The housing 11 includes a first wall 40. Optionally, the first wall 40 may be at least a part of the housing body 111, or at least a part of the cover 112, or both the housing body 111 and the cover 112 may include the first wall 40. The first wall 40 includes a fiber fabric 41, unidirectional fibers 42, and a thermoplastic resin component 43. The unidirectional fibers 42 may be a layered structure extending in one direction, with no cross-weaving between the unidirectional fibers 42 in the same layer. The first wall 40 may include one, two, or more layers of unidirectional fibers 42. The unidirectional fibers 42 in different layers may extend in the same direction, or they may intersect. The specific arrangement can be selected according to actual needs.

[0091] The first unidirectional fiber 42 and the second unidirectional fiber 42 in the fiber fabric 41 intersect and weave with each other to form a woven fabric structure. The first fiber 411 and the second fiber 412 intersect, and optionally, the included angle between the extension directions of the first fiber 411 and the second fiber 412 can be 90°, 60°, 45° or 30°, etc.

[0092] Optionally, the first wall 40 includes one or more layers of unidirectional fibers 42. Of course, the first wall 40 may also include one or more layers of fiber fabric 41. The fiber fabric 41 may be disposed on the side of the unidirectional fibers 42 close to the battery cell 30, or the fiber fabric 41 may be disposed on the side of the unidirectional fibers 42 away from the battery cell 30, or the fiber fabric 41 may be sandwiched between two layers of unidirectional fibers 42.

[0093] The fiber fabric 41, thermoplastic resin part 43, and unidirectional fiber 42 can be formed by compression molding. Specifically, the fiber fabric 41, unidirectional fiber 42, and cured thermoplastic resin part 43 can be laid flat on the mold along the thickness direction Z. Then the mold is heated. Under heating, the thermoplastic resin part 43 changes from solid to fluid and becomes fluid. The flowing thermoplastic resin part 43 enters the unidirectional fiber 42 and fiber fabric 41. After cooling, the thermoplastic resin part 43 is cured and immersed in the unidirectional fiber 42 and fiber fabric 41 respectively, connecting the fiber fabric 41 and the unidirectional fiber 42 to form an integral composite material structure.

[0094] Understandably, before processing, the thermoplastic resin part 43 can be pre-impregnated into the unidirectional fiber 42, and after curing, it can form a strip-shaped prefabricated plate. In this way, the prefabricated plate can be directly used for processing during the processing of the box body 11. Alternatively, the thermoplastic resin part 43 can not be pre-impregnated into the unidirectional fiber 42. During the production of the box body 11, the unidirectional fiber 42, the fiber fabric 41, and the thermoplastic resin part 43 can be laid in the mold respectively.

[0095] The first wall 40 includes a first part 40a and a second part 40b, which intersect. Optionally, the first part 40a and the second part 40b can be perpendicular to each other. A transition connecting part 40c connects the first part 40a and the second part 40b. The transition connecting part 40c can be arc-shaped and integrally formed with the first part 40a and the second part 40b.

[0096] At least the transition connection portion 40c is provided with fiber fabric 41. Optionally, fiber fabric 41 may be provided only at the transition connection portion 40c, or fiber fabric 41 may also be provided at the first portion 40a or the second portion 40b of the first wall 40. Exemplarily, fiber fabric 41 may be provided in the entire area of ​​the first wall 40.

[0097] The transition connection 40c can be the corner area of ​​the first wall 40. Usually, during the molding process of the first wall 40, due to the error of the mold size and the manufacturing tolerance, if the transition connection 40c of the first wall 40 is only provided with unidirectional fibers 42, the unidirectional fibers 42 in the transition connection 40c are more likely to become loose or have gaps after molding, which seriously affects the airtightness of the first wall 40.

[0098] During the molding process of the first wall 40, the thermoplastic resin part 43 exhibits fluidity. The intersection of the first fiber 411 and the second fiber 412 exerts significant pressure on the flowing thermoplastic resin part 43. This promotes the flow of resin within the fiber fabric 41 and the unidirectional fibers 42. After the thermoplastic resin part 43 has cured, it helps reduce the risk of large pores appearing inside the thermoplastic resin part 43, which could cause the housing 11 to fail to seal. Furthermore, the pressure exerted by the fiber fabric 41 on the flowing thermoplastic resin part 43 is relatively uniform, which helps improve the uniformity of the distribution of the thermoplastic resin part 43, and consequently, improves the uniformity of the structural strength of the first wall 40.

[0099] Furthermore, since the first fiber 411 and the second fiber 412 in the fiber fabric 41 are cross-woven, during the forming process of the transition connection part 40c, the first fiber 411 and the second fiber 412 restrain each other, and the forming performance of the fiber fabric 41 with the mold is better, which helps to reduce the risk of wrinkles or loosening after the first wall 40 is formed.

[0100] Furthermore, after the first wall 40 is formed, the surface of the fiber fabric 41 is relatively rough due to the cross-weaving of the first fiber 411 and the second fiber 412 in the fiber fabric 41. This increases the frictional resistance between the fiber fabric 41 and the unidirectional fiber 42, which in turn helps to improve the shear strength between adjacent layers inside the first wall 40.

[0101] The battery device 10 provided in this application embodiment, by providing at least a transition connection portion 40c of the first wall 40 of the housing 11 comprising fiber fabric 41, unidirectional fibers 42, and thermoplastic resin components 43, is beneficial to improving the shear strength between different layers of the at least transition connection portion 40c of the first wall 40, as well as the overall structural strength of the transition connection portion 40c. Furthermore, during the molding process of the transition connection portion 40c, the first fiber 411 and the second fiber 412 in the fiber fabric 41 mutually restrain each other, exhibiting high conformability, facilitating the formation of the arc-shaped structure of the transition connection portion 40c. This helps reduce the risk of loosening of the unidirectional fibers 42 in the transition connection portion 40c, and the fiber fabric 41 can promote the flow of the thermoplastic resin components 43 in the transition connection portion 40c, thereby reducing the risk of porosity in the transition connection portion 40c, improving the density and structural strength of the transition connection portion 40c, reducing the risk of sealing failure in the transition connection portion 40c, and thus improving the sealing performance of the housing 11. Therefore, this is beneficial to improving the reliability of the battery device 10.

[0102] In some embodiments, such as Figure 8 As shown, the first wall 40 includes at least two layers of unidirectional fibers 42, and the fiber fabric 41 is sandwiched between the at least two layers of unidirectional fibers 42.

[0103] In this way, the fiber fabric 41 has unidirectional fibers 42 on either side of the thickness direction Z. Optionally, the fiber fabric 41 may have one, two or more layers of unidirectional fibers 42 on either side of the thickness direction Z.

[0104] In the process of producing the first wall 40 by thermoplastic process, the thermoplastic resin part 43 is usually pre-impregnated in unidirectional fiber 42. During the heating process in the mold, the thermoplastic resin part 43 is then impregnated into the fiber fabric 41.

[0105] By setting the fiber fabric 41 to have unidirectional fibers 42 on both sides along the thickness direction Z, the thermoplastic resin parts 43 on both sides along the thickness direction Z of the fiber fabric 41 can impregnate the fiber fabric 41 during the molding process. This is beneficial to improve the wettability of the thermoplastic resin parts 43 to the fiber fabric 41, which in turn is beneficial to improve the density of the first wall 40 and reduce the risk of pores appearing inside the first wall 40, which may affect the airtightness or structural strength of the first wall 40.

[0106] In some embodiments, at least two layers of unidirectional fibers 42 are provided on at least one side of the fiber fabric 41 along the thickness direction Z, and the extension directions of the at least two layers of unidirectional fibers 42 on the same side of the thickness direction Z of the fiber fabric 41 intersect.

[0107] Optionally, at least two layers of unidirectional fibers 42 may be provided on either side of the fiber fabric 41 along the thickness direction Z, or at least two layers of unidirectional fibers 42 may be provided on both sides of the fiber fabric 41 along the thickness direction Z.

[0108] The fiber fabric 41 is arranged with two layers of unidirectional fibers 42 intersecting each other along the same side of the thickness direction Z. Optionally, the two layers of unidirectional fibers 42 on the same side of the fiber fabric 41 along the thickness direction Z can intersect at 90°, 60°, 45° or 30°, etc.

[0109] It is understandable that the fiber fabric 41 has a high load-bearing capacity along the extension direction perpendicular to the fiber fabric 41. Therefore, by setting the extension directions of the two layers of unidirectional fibers 42 on the same side to intersect, it is beneficial to improve the load-bearing capacity of the first wall 40 along at least two directions perpendicular to the two layers of unidirectional fibers 42. In this way, it is beneficial to improve the overall load-bearing capacity of the first wall 40, and thus to improve the structural strength of the first wall 40.

[0110] In some embodiments, at least two layers of unidirectional fibers 42 are provided on both sides of the fiber fabric 41 along the thickness direction Z, and the extension directions of the at least two layers of unidirectional fibers 42 on either side of the fiber fabric 41 along the thickness direction Z are perpendicular to each other.

[0111] Thus, at least two layers of mutually perpendicular unidirectional fibers 42 are provided on either side of the fiber fabric 41 along the thickness direction Z. Normally, during use, the battery device 10 mainly bears external loads in two directions: the forward direction and the direction perpendicular to the forward direction. By providing at least two layers of mutually perpendicular unidirectional fibers 42 in any direction of the fiber fabric 41, the unidirectional fibers 42 can be provided in both the forward direction and the direction perpendicular to the forward direction during use of the battery device 10, thereby improving the load-bearing capacity of the first wall 40 in both the forward direction and the direction perpendicular to the forward direction of the battery device 10. This is beneficial to further improve the reliability of the battery device 10.

[0112] In some embodiments, such as Figure 8 and Figure 10 As shown, the extension directions of the first fiber 411 and the second fiber 412 are perpendicular to each other.

[0113] The fiber fabric 41 has high load-bearing capacity in two directions perpendicular to the first fiber 411 and the second fiber 412. During use, the battery device 10 mainly bears impact loads in the forward direction and in directions perpendicular to the forward direction. By arranging the extension directions of the first fiber 411 and the second fiber 412 perpendicular to each other, during the arrangement of the battery device 10, one of the first fiber 411 and the second fiber 412 can extend along the forward direction of the battery device 10, while the other extends perpendicular to the forward direction. This improves the overall load-bearing capacity of the battery device 10 and further enhances its reliability.

[0114] In some embodiments, such as Figure 8 and Figure 10 As shown, the first fiber 411 extends along the first direction X, and the second fiber 412 extends along the second direction Y. The first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other. At least one side of the fiber fabric 41 along the thickness direction Z is provided with unidirectional fibers 42 extending along the first direction X and unidirectional fibers 42 extending along the second direction Y.

[0115] Optionally, unidirectional fibers 42 extending along the first direction X and the second direction Y can be provided on one side of the fiber fabric 41 along the thickness direction Z, or unidirectional fibers 42 extending along the first direction X and the second direction Y can be provided on both sides of the fiber fabric 41 along the thickness direction Z.

[0116] The first fiber 411 and the second fiber 412 extend along the first direction X and the second direction Y, respectively. The fiber fabric 41 is provided with at least two layers of unidirectional fibers 42 extending along the first direction X and the second direction Y on at least one side along the thickness direction Z. This is beneficial to maximize the load-bearing capacity of the first wall 40 along the directions perpendicular to the first direction X and the second direction Y. When arranging the battery device 10, the first direction X can be set to be parallel to the forward direction of the battery device 10, and the second direction Y can be set to be perpendicular to the forward direction of the battery device 10, so that the first wall 40 has a greater load-bearing capacity both along the forward direction of the battery device 10 and perpendicular to the forward direction of the battery device 10. This is beneficial to further improve the overall load-bearing capacity of the battery device 10 and further improve the reliability of the battery device 10.

[0117] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the box 11 includes a box body 111 and a cover 112. The cover 112 covers the box body 111. The battery cell 30 is connected to the box body 111. The cover 112 includes a first wall 40.

[0118] Optionally, the entire cover 112 can be the first wall 40, that is, the entire cover 112 can be a composite material structure, or a part of the cover 112 can be the first wall 40, while the other parts can be steel plates or other structures.

[0119] The battery cell 30 is connected to the casing body 111, which provides a greater load-bearing capacity for the battery cell 30. Therefore, the casing body 111 can be made of high-strength materials such as steel plates to meet its load-bearing requirements. The cover 112, on the other hand, bears a smaller load and has lower structural strength requirements. Including a first wall 40 in the cover 112 helps to meet its load-bearing requirements while also reducing its weight.

[0120] In some embodiments, the thermoplastic resin part 43 includes polypropylene, nylon, polyphenylene ether, or polyethylene terephthalate.

[0121] The thermoplastic resin component 43 can be made of polypropylene, nylon, polyphenylene ether, or polyethylene terephthalate. Polypropylene, nylon, polyphenylene ether, and polyethylene terephthalate are all reprocessable and can be re-cured and molded when heated. They are also readily available and inexpensive. Thus, while improving the processing convenience of the housing 11, it also helps to reduce the production cost of the battery device 10.

[0122] In some embodiments, the areal density ρ of the fiber fabric 41 s Satisfying: 200g / m 2 ≤ρ s ≤600g / m 2 .

[0123] Optionally, ρ s It can be 200g / m 2 250g / m 2 300g / m 2 350g / m 2 400g / m 2 450g / m 2 500g / m 2 550g / m 2 Or 600g / m 2 wait.

[0124] It is understandable that the greater the areal density of the fiber fabric 41, the more beneficial it is for the fiber fabric 41 to absorb the gap deviation between the upper and lower molds during the thermoplastic molding process of the first wall 40. Conversely, the smaller the areal density of the fiber fabric 41, the more beneficial it is for improving the wettability of the thermoplastic resin part 43 to the fiber fabric 41, thereby improving the density of the thermoplastic resin part 43.

[0125] Therefore, by setting 200g / m 2 ≤ρ s ≤600g / m 2 This is beneficial to improving the ability of the fiber fabric 41 to absorb the gap deviation of the mold during the molding process, which in turn is beneficial to improving the structural stability of the first wall 40 after molding. At the same time, it is also beneficial to improve the wettability of the thermoplastic resin part 43 on the fiber fabric 41 and improve the density of the first wall 40.

[0126] Secondly, the electrical device provided in the embodiments of this application includes the battery device 10 provided in the above embodiments, and the battery device 10 is used to provide electrical energy.

[0127] The electrical device provided in this application embodiment has the same technical effect as the battery device 10 provided in this application embodiment, and will not be described again here.

[0128] In some embodiments, the first fiber 411 extends along the first direction X, the second fiber 412 extends along the second direction Y, the first direction X, the second direction Y and the thickness direction Z are perpendicular to each other, and the first direction X is the forward direction of the electrical device.

[0129] Electrical devices can be vehicles such as vehicle 1. Typically, when vehicle 1 is moving forward, the impact load it bears is mainly along the direction of travel. At the same time, vehicle 1 may also need to bear lateral impacts, that is, impacts perpendicular to the direction of travel. Therefore, during the use of electrical devices, the external impact loads they bear are usually along the direction of travel and in directions perpendicular to the direction of travel.

[0130] If the first fiber 411 extends along the forward direction of the vehicle 1, then the first fiber 411 can improve the load-bearing capacity of the first wall 40 along the forward direction perpendicular to the vehicle 1. If the second fiber 412 extends along the forward direction perpendicular to the vehicle 1, then the second fiber 412 can improve the load-bearing capacity of the first wall 40 along the forward direction of the vehicle 1.

[0131] Therefore, by setting the first fiber 411 and the second fiber 412 to extend along the first direction X and the second direction Y respectively, and setting the first direction X as the forward direction of the electrical device, it is beneficial to improve the load-bearing capacity of the first wall 40 along the forward direction of the electrical device and in both directions perpendicular to the forward direction, and further beneficial to improve the reliability of the electrical device.

[0132] In some embodiments, the first wall 40 includes at least two layers of unidirectional fibers 42, at least one layer of unidirectional fibers 42 extending along a first direction X, and at least another layer of unidirectional fibers 42 extending along a second direction Y.

[0133] Optionally, at least two layers of unidirectional fibers 42 may be provided on either side of the fiber fabric 41 along the thickness direction Z, or at least one layer of unidirectional fibers 42 may be provided on both sides of the interlayer fabric along the thickness direction Z.

[0134] This will help to further improve the load-bearing capacity of the first wall 40 along the direction of the electrical device's movement and perpendicular to the direction of movement, and further improve the reliability of the electrical device.

[0135] In some embodiments, such as Figures 2 to 10 As shown, the battery device 10 provided in this embodiment includes a housing 11 and a battery cell 30, which is housed within the housing 11. The housing 11 includes a first wall 40, which comprises a fiber fabric 41, unidirectional fibers 42, and a thermoplastic resin component 43. The fiber fabric 41 includes a first fiber 411 and a second fiber 412, the extension directions of which intersect and are woven together. The fiber fabric 41 and the unidirectional fibers 42 are stacked along the thickness direction Z of the first wall 40. The thermoplastic resin component 43 connects the fiber fabric 41 and the unidirectional fibers 42. At least two layers of unidirectional fibers 42 are provided on both sides of the fiber fabric 41 along the thickness direction Z, and the extension directions of the at least two layers of unidirectional fibers 42 on either side of the fiber fabric 41 along the thickness direction Z are perpendicular to each other. The first fiber 411 extends along a first direction X, and the second fiber 412 extends along a second direction Y. The first direction X, the second direction Y, and the thickness direction Z are perpendicular. The fiber fabric 41 has unidirectional fibers 42 extending in a first direction X and a second direction Y on at least one side along the thickness direction Z. The housing 11 includes a housing body 111 and a cover 112. The cover 112 covers the housing body 111, and the battery cell 30 is connected to the housing body 111. The cover 112 includes a first wall 40. The first wall 40 includes a first part 40a, a second part 40b, and a transition connection part 40c. The first part 40a and the second part 40b are perpendicular to each other, and the transition connection part 40c connects the first part 40a and the second part 40b. The transition connection part 40c is provided with the fiber fabric 41. The thermoplastic resin component 43 includes polypropylene, nylon, polyphenylene ether, or polyethylene terephthalate. The areal density ρ of the fiber fabric 41... s Satisfying: 200g / m 2 ≤ρ s ≤600g / m 2 .

[0136] The battery device 10 provided in this application embodiment, by providing at least a transition connection portion 40c of the first wall 40 of the housing 11 comprising fiber fabric 41, unidirectional fibers 42, and thermoplastic resin components 43, is beneficial to improving the shear strength between different layers of the at least transition connection portion 40c of the first wall 40, as well as the overall structural strength of the transition connection portion 40c. Furthermore, during the molding process of the transition connection portion 40c, the first fiber 411 and the second fiber 412 in the fiber fabric 41 mutually restrain each other, exhibiting high conformability, facilitating the formation of the arc-shaped structure of the transition connection portion 40c. This helps reduce the risk of loosening of the unidirectional fibers 42 in the transition connection portion 40c, and the fiber fabric 41 can promote the flow of the thermoplastic resin components 43 in the transition connection portion 40c, thereby reducing the risk of porosity in the transition connection portion 40c, improving the density and structural strength of the transition connection portion 40c, reducing the risk of sealing failure in the transition connection portion 40c, and thus improving the sealing performance of the housing 11. Therefore, this is beneficial to improving the reliability of the battery device 10. Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body comprising a first wall, the first wall comprising a fiber fabric, unidirectional fibers and a thermoplastic resin member, the fiber fabric comprising first fibers and second fibers, the first fibers intersecting with the second fibers in the extending direction and being interwoven, the fiber fabric and the unidirectional fibers being stacked along the thickness direction of the first wall, the thermoplastic resin member connecting the fiber fabric and the unidirectional fibers, the first wall comprising a first part, a second part and a transition connecting part, the first part intersecting with the second part, the transition connecting part connecting the first part and the second part, at least the transition connecting part being provided with the fiber fabric; a battery cell accommodated in the box body.

2. The battery device according to claim 1, characterized by The first wall comprises at least two layers of the unidirectional fibers, and the fiber fabric is arranged between the at least two layers of the unidirectional fibers.

3. The battery device of claim 2, wherein, The fiber fabric is provided with at least two layers of the unidirectional fibers on at least one side along the thickness direction, and the extending directions of the at least two layers of the unidirectional fibers on the same side along the thickness direction are arranged to intersect with each other.

4. The battery device of claim 3, wherein The fiber fabric is provided with at least two layers of the unidirectional fibers on both sides along the thickness direction, and the extending directions of the at least two layers of the unidirectional fibers on any one side along the thickness direction are arranged to be perpendicular to each other.

5. The battery device of claim 1, wherein The extending directions of the first fibers and the second fibers are perpendicular to each other.

6. The battery device of claim 5, wherein, The first fibers extend along a first direction, the second fibers extend along a second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other. The fiber fabric is provided with the unidirectional fibers extending along the first direction and the unidirectional fibers extending along the second direction on at least one side along the thickness direction.

7. The battery device according to any one of claims 1 to 6, characterized by, The box body comprises a box body and a cover, the cover is arranged on the box body, the battery cell is connected with the box body, and the cover comprises the first wall.

8. The battery device according to any one of claims 1 to 6, characterized by The thermoplastic resin member comprises polypropylene, nylon, polyphenyl ether or polyethylene terephthalate.

9. The battery device according to any one of claims 1 to 6, characterized by The area density ps of the fiber fabric satisfies 200 g / m2≤ps≤600 g / m2.

10. An electrical device, characterized by The battery device comprises the battery device according to any one of claims 1 to 9, and the battery device is used to provide electric energy.

11. The powered device of claim 10, wherein, The first fibers extend along a first direction, the second fibers extend along a second direction, the first direction, the second direction and the thickness direction are perpendicular to each other, and the first direction is the advancing direction of the electric device.

12. The powered device of claim 11, wherein, The first wall comprises at least two layers of the unidirectional fibers, at least one layer of the unidirectional fibers extends along the first direction, and at least another layer of the unidirectional fibers extends along the second direction.

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