Battery box, battery device and power utilization device

Abstract

The utility model discloses a battery box, a battery device and a power utilization device. The battery box comprises a box body, a protection plate and a degassing element, an accommodating space for accommodating the battery cells is formed in the box body; the protection plate is located on the side, away from the containing space, of the box body and is in sealed connection with the box body to form a sealed cavity. The degassing element is arranged in the sealing cavity and used for absorbing at least part of gas in the sealing cavity. According to the scheme, the degassing element is arranged in the sealing cavity and can absorb at least part of gas in the sealing cavity, so that the gas pressure in the sealing cavity is reduced, and the risk of bulging deformation of the protection plate is reduced.

Description

Technical Field

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

[0002] As the market share of electric vehicles gradually increases, the driving conditions and usage scenarios of electric vehicles have become more diverse and complex, placing higher demands on the protection of battery devices.

[0003] Usually, a protective plate can be installed on the outside of the battery device to form a sealed cavity between the protective plate and the battery device so that the battery box can be protected by the protective plate. However, after the battery device is used for a long time, gas will be generated in the sealed cavity, causing the air pressure in the sealed cavity to increase, making the protective plate prone to bulging and deformation. Utility Model Content

[0004] The present application provides a battery box, a battery device and an electrical device to reduce the risk of bulging and deformation of the protective plate.

[0005] In order to solve the above technical problems, the first technical solution provided in the present application is: a battery box, comprising a box body, a protective plate and a degassing element; the box body is formed with a accommodating space for accommodating battery cells; the protective plate is located on the side of the box body away from the accommodating space, and is sealed and connected to the box body to form a sealed cavity; the degassing element is arranged in the sealed cavity, and the degassing element is used to absorb at least part of the gas in the sealed cavity.

[0006] The beneficial effect of the battery device provided in the present application is: the battery box provided in the present application forms a sealed cavity between the bottom guard plate and the box body, and a degassing element is arranged in the sealed cavity. The degassing element can absorb at least part of the gas in the sealed cavity, thereby reducing the air pressure in the sealed cavity and reducing the risk of bulging and deformation of the protective plate.

[0007] In some embodiments, the degassing element includes a core material capable of absorbing gas through a chemical reaction.

[0008] As a functional component for absorbing gas, the core material can react chemically with the gas to absorb the gas. Compared with the physical absorption method, the chemical absorption method is simple and effective.

[0009] In some embodiments, the degassing element further comprises a breathable membrane material, which wraps the core material and is used for gas permeation. The breathable membrane material wraps the core material, which can better protect the core material through the breathable membrane material and reduce the effect of the breathable membrane material on the core material's air absorption.

[0010] In some embodiments, the degassing element further comprises a reinforcing substrate fixedly connected to the breathable membrane, the reinforcing substrate surrounds a portion of the breathable membrane and exposes another portion of the breathable membrane, and the reinforcing substrate is connected to at least one of the protective plate and the box body.

[0011] The degassing element is connected to at least one of the protective plate and the box body through a reinforcing substrate, which facilitates fixing the degassing element in the sealed cavity, and the reinforcing substrate exposes another part of the breathable membrane material, which can reduce the influence of the reinforcing substrate on the air absorption of the breathable membrane material.

[0012] In some embodiments, the breathable membrane material includes a first breathable membrane material and a second breathable membrane material, the first breathable membrane material and the second breathable membrane material together enclose a core material installation cavity, and the core material is located in the core material installation cavity.

[0013] The first breathable membrane material and the second breathable membrane material together enclose a core material installation cavity, which is convenient for installing the core material into the breathable membrane material.

[0014] In some embodiments, the degassing element further includes a reinforcing substrate, which is fixedly connected to the first breathable membrane and located on a side of the first breathable membrane away from the second breathable membrane to expose the second breathable membrane.

[0015] The degassing element is connected to at least one of the protective plate and the box body through the reinforcing substrate, which facilitates fixing the degassing element in the sealed cavity, and the reinforcing substrate exposes the second breathable membrane material, which can reduce the influence of the reinforcing substrate on the air absorption of the second breathable membrane material.

[0016] In some embodiments, the first breathable membrane material has a first bonding area and a first containing area, and the first bonding area is arranged around the periphery of the first containing area; the second breathable membrane material has a second bonding area and a second containing area, and the second bonding area is arranged around the periphery of the second containing area; the first bonding area and the second bonding area are bonded and fixed, and the first containing area and the second containing area are separated to form a core material installation cavity.

[0017] In this way, the first breathable membrane material and the second breathable membrane material can be fitted and fixed in the edge area, and the core material can be accommodated in the area inside the edge area of ​​the first breathable membrane material and the second breathable membrane material. On the one hand, it is convenient to fix the first breathable membrane material and the second breathable membrane material, and on the other hand, it can also provide a larger installation space for the core material.

[0018] In some embodiments, the reinforced substrate includes an edge portion and a center portion, the center portion is recessed relative to the edge portion, the center portion is bonded and fixed to the first accommodating area, and the edge portion is bonded and fixed to the first bonding area.

[0019] The shape of the reinforcing substrate is designed to match the shape of the breathable membrane material. The reinforcing substrate is bent and extended as a whole, and can better fit the surface shape of the breathable membrane material to form a better fixing effect on the breathable membrane material containing the core material.

[0020] In some embodiments, the degassing element further includes an adhesive layer, which is disposed on a side of the reinforcing substrate facing away from the core material, and the degassing element is fixed in the sealed cavity through the adhesive layer.

[0021] In this way, the degassing element is easily fixed in the sealed cavity, and the risk of displacement of the degassing element in the sealed cavity is reduced.

[0022] In some embodiments, the degassing element is fixed to the box, and a gap is formed between the degassing element and the protection plate.

[0023] The degassing element is spaced apart from the protective plate, and there is a gap between the breathable membrane material and the protective plate, so the gas in the sealed cavity can enter the breathable membrane material through the gap between the breathable membrane material and the protective plate.

[0024] In some embodiments, the battery box further includes a heat exchange element, and a portion of the heat exchange element is located in the sealed cavity.

[0025] In this way, the heat exchange element can exchange heat with the box body, and then exchange heat with the battery cells in the box body, thereby adjusting the temperature of the battery cells.

[0026] In some embodiments, the heat exchange element includes at least one bent and extended heat exchange tube, the degassing element avoids the heat exchange tube, or the degassing element and the heat exchange tube are spaced apart.

[0027] In this way, the heat exchange element includes at least one bent and extended heat exchange tube to increase the heat exchange area, and the degassing element avoids the heat exchange tube, or the degassing element and the heat exchange tube are arranged at a distance to reduce interference between the degassing element and the heat exchange tube, thereby affecting the heat exchange efficiency of the heat exchange tube.

[0028] In some embodiments, the battery box also includes a heat-conducting layer fixed to the box body, the heat-conducting layer is located on the side of the box body away from the accommodating space, and the heat exchange component is in contact with the heat-conducting layer; the degassing element is fixed to the side of the heat-conducting layer away from the box body.

[0029] In this way, the heat of the box can be transferred to the heat exchange element through the heat conductive layer, thereby increasing the heat exchange effect and efficiency.

[0030] In order to solve the above technical problems, the second technical solution provided in the present application is: a battery device, including a battery cell and a battery box of any of the above solutions, wherein the battery cell is arranged in the accommodating space.

[0031] The battery device provided in the present application has all the advantages of the battery box described in any of the above solutions, which will not be repeated here.

[0032] In order to solve the above technical problems, the third technical solution provided in the present application is: an electrical device, comprising the above battery device, wherein the battery device is used to provide electrical energy for the electrical device.

[0033] The electrical device provided in the present application has all the advantages of the battery box described in any of the above solutions, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0035] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments provided by the present application;

[0036] Figure 2 is an exploded view of a battery device according to one or more embodiments provided by the present application;

[0037] Figure 3 is a schematic diagram of the exploded structure of a battery box according to one or more embodiments provided in the present application;

[0038] Figure 4 is a top view of a battery box according to one or more embodiments provided by the present application;

[0039] Figure 5 yes Figure 4 AA cross section in;

[0040] Figure 6 yes Figure 5 The enlarged view of point B in the middle;

[0041] Figure 7 yes Figure 3 and Figure 6 A schematic diagram of the three-dimensional structure of the degassing element;

[0042] Figure 8 yes Figure 7 Schematic diagram of the exploded structure of the degassing element;

[0043] Fig. 9 yes Figure 7 and Figure 8 Cross-sectional view of a degassing element.

[0044] Description of reference numerals:

[0045] Vehicle 1000; controller 200; motor 300; battery device 100; battery cell 10; battery box 20; box body 21; bottom wall 210; first box body 211; second box body 212; accommodating chamber 201; protective plate 22; sealed chamber 220; protective plate body 222; buffer layer 221; annular seal 23; degassing element 24; core material 241; breathable film material 242; first breathable film material 2421; first accommodating area 24211; first bonding area 24212; second breathable film material 2422; second accommodating area 24221; second bonding area 24222; reinforcing substrate 243; center portion 2431; edge portion 2432; adhesive layer 244; heat exchange component 25; thermal conductive layer 26. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", and "second direction" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0054] The battery device includes a battery box and a battery cell contained in the battery box. In order to enhance the protection of the battery device, a protective plate can usually be installed on the outside of the battery device to form protection for the battery box. The protective plate usually has a buffer layer. When the battery device is hit, the buffer layer can absorb part of the impact energy, thereby reducing the impact energy transmitted from the protective plate to the battery box, and further reducing the risk of deformation of the battery box. In addition, a sealed cavity is formed between the protective plate and the battery box, which adds a sealing structure to the battery device. After the battery box is damaged, the sealed cavity can reduce the risk of the liquid inside the battery box directly leaking out of the battery box, thereby increasing the anti-leakage effect of the battery device. In the related art, the buffer layer is mostly made of foaming material to increase the buffering capacity. After the protective plate with the buffer layer is installed, during the long-term use of the battery device, the buffer layer will continue to produce gas, such as carbon dioxide gas, which causes the air pressure in the sealed cavity to increase, thereby causing the protective plate to easily bulge and deform.

[0055] In view of this, in order to reduce the risk of bulging and deformation of the protective plate due to increased air pressure in the sealed cavity, an embodiment of the present application provides a battery box, the battery box comprising a box body, a protective plate and a degassing element; the box body is formed with a accommodating space for accommodating battery cells; the protective plate is located on the side of the box body away from the accommodating space, and is sealed and connected to the box body to form a sealed cavity; the degassing element is arranged in the sealed cavity, and the degassing element is used to absorb at least part of the gas in the sealed cavity.

[0056] The battery box provided by the present application forms a sealed cavity between the bottom guard plate and the box body, and a degassing element is arranged in the sealed cavity. The degassing element can absorb at least part of the gas in the sealed cavity, thereby reducing the air pressure in the sealed cavity and reducing the risk of bulging and deformation of the protective plate. Compared with the solution of opening a hole on the protective plate and installing an air pressure balance valve in the related art, the solution of the present application does not need to open a hole on the protective plate, so it can reduce the risk of sealing leakage of the battery box.

[0057] The battery device involved in the embodiments of the present application can be used in an electrical device that uses the battery device as a power source. The electrical device involved in the embodiments of the present application may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, a vehicle, a ship, a spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. According to the drive mode, the vehicle may be a front-wheel drive vehicle, a rear-wheel drive vehicle, or a four-wheel drive vehicle.

[0058] The electrical device includes a device body and a battery device as mentioned in the context. The device body is the main frame structure of the electrical device. For example, when the electrical device is a vehicle, the device body is the vehicle body. When the electrical device is a ship, the device body is the ship body.

[0059] In other embodiments, the battery device involved in the embodiments of the present application can also be used in an energy storage system that uses the battery device as an energy storage element. Among them, the energy storage system can include an energy storage container, an energy storage cabinet, etc.

[0060] For ease of description, the embodiments of the present application are described using an electrical device as a vehicle as an example.

[0061] See also Figure 1 , Figure 11 is a schematic diagram of the structure of a vehicle according to one or more embodiments provided by the present application. A controller 200, a motor 300 and a battery device 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery device 100 to power the motor 300. For example, a battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0062] See also Figure 2 , Figure 2 is an exploded view of a battery device according to one or more embodiments provided in the present application. The battery device 100 may include a battery box 20 and a battery cell 10 . The battery box 20 is used to accommodate the battery cell 10 .

[0063] The battery device 100 according to the embodiment of the present application refers to a single physical module including a plurality of battery cells 10 to provide higher voltage and capacity.

[0064] The battery cell 10 involved in the embodiment of the present application refers to the smallest unit for storing and outputting electric energy. The battery cell 10 may be a secondary battery, which refers to a battery cell 10 that can be used continuously by activating the active material by charging after the battery cell 10 is discharged. Each battery cell 10 may also be a primary battery.

[0065] The battery cell 10 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 storage battery, etc., which is not limited in the present embodiment. The battery cell 10 can be cylindrical, flat, rectangular or other shapes.

[0066] In the battery device 100, there are multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. Multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the battery box 20. It is also possible that all battery cells 10 are directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all battery cells 10 is accommodated in the battery box 20. In some embodiments, the battery device 100 may also include a busbar component, and multiple battery cells 10 can be electrically connected through the busbar component to achieve the series connection, parallel connection, or mixed connection of multiple battery cells 10. The busbar component may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0067] The battery box 20 is used to encapsulate the battery cell 10, so as to protect the battery cell 10 and reduce the influence of liquid or other foreign matter on the charging or discharging of the battery cell 10. Specifically, the battery box 20 has a receiving space 201, and the battery cell 10 is received in the receiving space 201.

[0068] In some embodiments, the battery box 20 may be a part of the chassis structure of the vehicle 1000. For example, the top cover of the battery box 20 may become at least a part of the floor of the vehicle 1000, or the frame of the battery box 20 may become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0069] The battery box 20 is a packaging structure for the battery cell 10. The battery box 20 can have various structures. Figure 2 The battery box 20 includes a box body 21. The box body 21 is a frame structure of the battery box 20. The box body 21 may include a first box body 211 and a second box body 212. The first box body 211 and the second box body 212 cover each other. The first box body 211 and the second box body 212 jointly define a receiving cavity 201 for receiving the battery cell 10. The second box body 212 may be a hollow structure with one end open. The first box body 211 is a plate-like structure. The first box body 211 covers the open side of the second box body 212 to form the box body 21 with the receiving space 201. The first box body 211 and the second box body 212 may also be a hollow structure with one side open. The open side of the first box body 211 covers the open side of the second box body 212 to form the box body 21 with the receiving space 201. Of course, the first box body 211 and the second box body 212 may be in various shapes, such as a cylinder, a cuboid, etc.

[0070] In order to improve the sealing performance after the first box body 211 and the second box body 212 are connected, an annular sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 211 and the second box body 212 .

[0071] Assuming that the first box body 211 covers the top of the second box body 212 , the first box body 211 can also be called an upper box cover, and the second box body 212 can also be called a lower box cover.

[0072] The box 21 can be a simple three-dimensional structure such as a single cuboid, a cylinder or a sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The material of the box 21 can be alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastics, or composite materials such as glass fiber and epoxy resin.

[0073] In some embodiments, the battery box 20 also includes a protective plate 22, which is located on the side of the box body 21 away from the accommodating space 201. The protective plate 22 is sealed and connected to the box body 21 to form a sealed cavity. Since the protective plate 22 mostly has a buffer layer of foam material, after the protective plate 22 with the buffer layer is installed in the box body 21, the buffer layer itself will continue to produce gas, and the gas generated cannot be discharged in the sealed cavity, resulting in an increase in the air pressure in the sealed cavity, and the protective plate 22 is prone to bulging and deformation.

[0074] The present application provides a battery box 20 that can reduce the air pressure in the sealed cavity, thereby reducing the risk of bulging and deformation of the protective plate 22. The specific structure of the battery box 20 and the principle of reducing the risk of bulging and deformation of the protective plate 22 are described in detail below with reference to the accompanying drawings.

[0075] The present application embodiment provides a battery box, see Figure 2 as well as Figures 3 to 6 , Figure 3 is a schematic diagram of the exploded structure of a battery box according to one or more embodiments provided in the present application, Figure 4 is a top view of a battery box according to one or more embodiments provided in the present application, Figure 5 yes Figure 4 AA cross-section diagram in Figure 6 yes Figure 5 In the enlarged view at point B, the battery box 20 includes a box body 21, a protective plate 22 and a degassing element 24. The box body 21 forms a accommodating space 201 for accommodating the battery cell 10. The protective plate 22 is located on the side of the box body 21 away from the accommodating space 201, and is sealed with the box body 21 to form a sealed cavity 220. The degassing element 24 is disposed in the sealed cavity 220, and is used to absorb at least part of the gas in the sealed cavity 220.

[0076] The box body 21 is a component for accommodating the battery cell 10 .

[0077] The protective plate 22 is a component used to protect the box body 21 to increase the overall protection capability of the battery box 20 . The sealed cavity 220 between the protective plate 22 and the box body 21 is used to enhance the sealing effect and service life of the battery box 20 .

[0078] The meaning of enhancing the sealing effect and service life of the battery box 20 is that when the box body 21 is damaged, the box body 21 may have the risk of leakage. If the protective plate 22 is not provided, the liquid will directly leak out of the box body 21. After the protective plate 22 is provided, when the box body 21 is damaged, the sealed cavity 220 adds a sealing structure to the battery device 100. After the box body 21 is damaged, the sealed cavity 220 can reduce the risk of the liquid inside the box body 21 directly leaking out of the box body 21, thereby increasing the overall sealing ability of the battery box 20. Generally speaking, one criterion for judging the service life of the battery device 100 is whether the battery device 100 leaks. Therefore, the protective plate 22 is provided in this embodiment, and the protective plate 22 and the box body 21 form a sealed cavity 220, which can reduce the risk of leakage of the battery box 20 and the battery device 100, and increase the sealing effect and service life of the battery box 20 and the battery device 100.

[0079] Since the protective plate 22 is mostly integrated with a buffer layer 221 formed by foaming a foam material, when the protective plate 22 with the buffer layer 221 is installed on the box body 21, the formed buffer layer 221 will continue to produce gases such as carbon dioxide for a period of time. These gases generated by the buffer layer 221 cannot be discharged in the sealed cavity 220, which will cause the air pressure in the sealed cavity 220 to increase. The protective plate 22 is prone to the risk of bulging and deformation due to the effect of the air pressure.

[0080] As an example, the protective plate 22 includes a protective plate body 222 and the above-mentioned buffer layer 221, the buffer layer 221 is connected to the protective plate body 222, the protective plate body 222 is sealed with the box body 21, and the buffer layer 221 is sandwiched between the protective plate body 222 and the box body 21. When the battery device 100 is subjected to an external impact, the buffer layer 221 can absorb the impact energy through its own elastic deformation, thereby reducing the impact energy transmitted from the protective plate 22 to the box body 21, thereby reducing the risk of deformation or damage to the box body 21.

[0081] In some embodiments, the buffer layer 221 can be integrally formed with the protective plate body 222 . In other embodiments, the buffer layer 221 and the protective plate body 222 can also be separate parts, which together constitute the protective plate 22 after being connected.

[0082] In the related art, the buffer layer 221 is mostly made of foam material to increase the buffering capacity. After the protective plate 22 is installed, during the use of the battery device 100, the buffer layer 221 will continue to produce gas, such as carbon dioxide gas, which will cause the air pressure in the sealed cavity 220 to increase, thereby causing the protective plate 22 to easily bulge and deform.

[0083] Specifically, the foam material has a rich pore structure inside, can absorb impact energy through its own elastic deformation, and has a good buffering effect. As an example, the foam material can be a polyurethane foam material. Polyurethane foam material (Polyurethane Foam, referred to as PU foam) has good sealing performance, can prevent the penetration of solids, liquids, and gases such as water and corrosive gases, has high water resistance and corrosion resistance, long service life, and light weight, which can reduce the overall weight of the battery device 100, and has strong compressive strength and tensile strength, can withstand a certain external pressure, and the polyurethane foam has a rich pore structure inside, can absorb impact energy through its own elastic deformation, and has a good buffering effect.

[0084] During the foaming process of polyurethane foam, carbon dioxide will be produced, and the foaming process of polyurethane is the reaction of material A with material B and water. When there is an error in the raw material ratio of polyurethane, or the raw material itself contains water, after the polyurethane foaming is completed, it will continue to chemically react with water to produce carbon dioxide gas for a period of time. Therefore, after the protective plate 22 with the buffer layer 221 that has completed foaming is installed in the box body 21, the buffer layer 221 will still continue to produce gas, resulting in an increase in the air pressure in the sealed cavity 220.

[0085] The battery box 20 provided in the embodiment of the present application has a degassing element 24 disposed in the sealed cavity 220. The degassing element 24 can absorb at least a portion of the gas in the sealed cavity 220, thereby reducing the air pressure in the sealed cavity 220 and reducing the risk of bulging and deformation of the protective plate 22.

[0086] In order to reduce the air pressure in the sealed cavity 220, in the related art, an air pressure balance valve is installed on the protective plate 22 to discharge the gas in the sealed cavity 220 to the outside of the sealed cavity 220, thereby balancing the air pressure inside and outside the sealed cavity 220. However, the installation of the air pressure balance valve requires a hole to be drilled on the protective plate 22, and the battery box 20 still has the risk of sealing leakage at the air pressure balance valve. The battery box 20 provided in the embodiment of the present application adopts a pressure reduction solution of setting a degassing element 24 in the sealed cavity 220. Compared with the solution of installing an air pressure balance valve on the protective plate 22, there is no need to drill a hole on the protective plate 22, thereby reducing the risk of sealing leakage of the battery device 100.

[0087] As an example, the box body 21 has a bottom wall 210, and the bottom wall 210 is used to carry the battery cell 10. The protective plate 22 is sealed and connected to the bottom wall 210, and forms a sealed cavity 220 with the bottom wall 210. The protective plate 22 connected to the bottom wall 210 can also be called a bottom protective plate. In another embodiment, the box body 21 also has a side wall, and the protective plate 22 can also be sealed and connected to the side wall of the box body 21.

[0088] In some embodiments, refer again to Figure 3 The protective plate 22 and the box body 21 are sealed and connected via an annular seal 23. The protective plate 22, the box body 21 and the annular seal 23 together define the sealed cavity 220. The annular seal 23 can be made of, but not limited to, sealant, foam, and the like.

[0089] In some embodiments, see Figures 7 to 9 , Figure 7 yes Figure 3 and Figure 6 Schematic diagram of the three-dimensional structure of the degassing element, Figure 8 yes Figure 7 Schematic diagram of the degassing component. Fig. 9 yes Figure 7 and Figure 8 The cross-sectional view of the degassing element 24 shows that the degassing element 24 includes a core material 241 capable of absorbing gas by chemical reaction. As a functional component for absorbing gas, the core material 241 can chemically react with at least part of the gas in the sealed cavity 220 to absorb the gas. Compared with the physical absorption method, the chemical absorption method is simple and effective. Of course, the present application does not exclude the solution that the degassing element 24 absorbs gas by physical means, for example, the gas can be compressed to reduce the gas pressure in the sealed cavity 220, or physical adsorption methods such as activated carbon can be used.

[0090] As an example, the gas includes carbon dioxide gas, and the core material 241 can at least chemically react with the carbon dioxide gas.

[0091] In some embodiments, the core material 241 includes but is not limited to at least one of calcium oxide, calcium hydroxide and sodium hydroxide. Calcium oxide, calcium hydroxide and sodium hydroxide can all react chemically with carbon dioxide gas to absorb carbon dioxide gas. Among them, calcium oxide has a strong adsorption capacity for carbon dioxide and a low price, so calcium oxide can be selected as the material of the core material 241, and only a small amount of calcium oxide is needed to absorb carbon dioxide gas.

[0092] In some embodiments, the core material 241 includes activated carbon. Activated carbon can also adsorb carbon dioxide. Activated carbon is a porous material that can adsorb various organic and inorganic substances due to its extremely high surface area and rich pore structure. Carbon dioxide is a gas with a small molecular size, so activated carbon can efficiently adsorb carbon dioxide by physical adsorption. During the adsorption process, carbon dioxide molecules interact with the pores on the surface of the activated carbon and are constrained on the surface of the activated carbon. Since the surface area of ​​activated carbon is large, a large amount of carbon dioxide can be adsorbed.

[0093] In some embodiments, the core material 241 is solid, and the core material 241 is in the form of at least one of powder and granules. In other embodiments, the block form is not excluded, but the powder / granules have a larger surface area and a better gas absorption effect than the block.

[0094] The core material 241 of the degassing element 24 in the present application is made of materials such as calcium oxide that can react chemically with carbon dioxide gas, so as to remove the carbon dioxide gas that is continuously generated by the polyurethane foam after the foaming is completed. It can be understood that the degassing element 24 in the present application is suitable for the material of the buffer layer 221 to be various materials that foam to generate carbon dioxide gas, such as the polyurethane foam material described in this embodiment, and can also be other materials that foam to generate carbon dioxide gas, while polypropylene plastic foaming materials (English name Expanded polypropylene, referred to as EPP) and the like will not generate carbon dioxide gas during the foaming process.

[0095] In some embodiments, refer again to Figure 8 and Fig. 9 The degassing element 24 further includes a breathable film 242, which wraps the core material 241 and is used for gas to pass through. In this embodiment, the breathable film 242 wraps the core material 241, which can better protect the core material 241 through the breathable film 242 and reduce the effect of the breathable film 242 on the air absorption of the core material 241.

[0096] It can be understood that the breathable film material 242 in the degassing element 24 is not necessary. The degassing element 24 may include the breathable film material 242 or may not include the breathable film material 242. In this embodiment, the breathable film material 242 is provided to wrap the core material 241 to protect the core material 241. In other embodiments, the degassing element 24 may not include the breathable film material 242, but directly place the core material 241 in the sealed cavity 220.

[0097] In some embodiments, refer again to Figure 8 and Fig. 9The degassing element 24 further includes a reinforcing substrate 243 fixedly connected to the breathable membrane 242. The reinforcing substrate 243 surrounds a portion of the breathable membrane 242 and exposes another portion of the breathable membrane 242. The reinforcing substrate 243 is connected to at least one of the protective plate 22 and the box 21. Since the breathable membrane 242 is soft and easily deformed, the reinforcing substrate 243 in this embodiment can keep the degassing element 24 in its basic form, which is convenient for the transportation and assembly of the degassing element 24. The degassing element 24 is connected to at least one of the protective plate 22 and the box 21 through the reinforcing substrate 243 to fix the degassing element 24 in the sealed cavity 220. In particular, when the degassing element 24 is fixed on the bottom wall 210 of the box 21, the gravity of the core material 241 itself makes it difficult for the breathable membrane 242 with the core material 241 to maintain its original shape, while the reinforcing substrate 243 enables the breathable membrane 242 with the core material 241 to maintain its original shape.

[0098] In some embodiments, the breathable membrane material 242 may be, but is not limited to, a polytetrafluoroethylene microporous film. Polytetrafluoroethylene has good chemical corrosion resistance and temperature resistance, and the breathable membrane material 242 is a microporous film, the micropores of which allow water vapor molecules and carbon dioxide gas to pass through, and the micropores are usually small in diameter, but not too large to cause the core material 241 to leak out of the breathable membrane material 242. In other embodiments, the breathable membrane material 242 may also be other porous materials with good air permeability, and should be a material that is not easy to react chemically with the core material 241.

[0099] In some embodiments, refer again to Figure 8 and Fig. 9 The breathable film material 242 includes a first breathable film material 2421 and a second breathable film material 2422. The first breathable film material 2421 and the second breathable film material 2422 are enclosed together to form a core material installation cavity, and the core material 241 is located in the core material installation cavity. In this embodiment, since the core material 241 is wrapped by the breathable film material 242, the first breathable film material 2421 and the second breathable film material 2422 are enclosed together to form a core material installation cavity, which facilitates the installation of the core material 241 into the breathable film material 242.

[0100] Furthermore, when the membrane material in the degassing element 24 includes the first breathable membrane material 2421 and the second breathable membrane material 2422, the degassing element 24 further includes a reinforcing substrate 243, which is fixedly connected to the first breathable membrane material 2421 and is located on a side of the first breathable membrane material 2421 away from the second breathable membrane material 2422 to expose the second breathable membrane material 2422. In this embodiment, since the breathable membrane material 242 is soft and easy to deform, the reinforcing substrate 243 in this embodiment can keep the degassing element 24 in a basic shape, which is convenient for transportation and assembly of the degassing element 24, and the reinforcing substrate 243 is located on a side of the first breathable membrane material 2421 away from the second breathable membrane material 2422 to expose the second breathable membrane material 2422, so that the gas in the sealed cavity 220 can pass through the second breathable membrane material 2422 to react with the core material 241.

[0101] In some embodiments, refer again to Fig. 9 The first breathable membrane material 2421 has a first bonding area 24212 and a first containing area 24211, and the first bonding area 24212 is arranged around the periphery of the first containing area 24211; the second breathable membrane material 2422 has a second bonding area 24222 and a second containing area 24221, and the second bonding area 24222 is arranged around the periphery of the second containing area 24221; the first bonding area 24212 and the second bonding area 24222 are bonded and fixed, and the first containing area 24211 and the second containing area 24221 are spaced apart to form the above-mentioned core material installation cavity.

[0102] In this way, the first breathable membrane material 2421 and the second breathable membrane material 2422 can be fitted and fixed in the edge area, and the core material 241 can be accommodated in the area inside the edge area of ​​the first breathable membrane material 2421 and the second breathable membrane material 2422. On the one hand, it is convenient to fix the first breathable membrane material 2421 and the second breathable membrane material 2422, and on the other hand, it can also provide a larger installation space for the core material 241.

[0103] The first bonding area 24212 and the second bonding area 24222 may be bonded and fixed by gluing, stitching, hot melting, etc.

[0104] In this embodiment, the first breathable film 2421 and the second breathable film 2422 are bonded and fixed at the edge region, so that a core material installation cavity is formed between the first breathable film 2421 and the second breathable film 2422. In other embodiments, in addition to being bonded and fixed at the edge region, the first breathable film 2421 and the second breathable film 2422 may also be bonded and fixed at other regions except the edge region, so that multiple core material installation cavities are formed between the first breathable film 2421 and the second breathable film 2422. It can be understood that a plurality of core material installation cavities are formed between the first breathable membrane material 2421 and the second breathable membrane material 2422. Compared with a single core material installation cavity formed between the first breathable membrane material 2421 and the second breathable membrane material 2422, the breathable membrane material 242 with the core material 241 is easier to maintain its overall shape. However, considering that the breathable membrane material 242 with the core material 241 can be fixed to maintain its overall shape by a reinforcing substrate 243, a single core material installation cavity can be formed between the first breathable membrane material 2421 and the second breathable membrane material 2422 to facilitate the fixation between the first breathable membrane material 2421 and the second breathable membrane material 2422.

[0105] In some embodiments, refer again to Fig. 9 The reinforcing substrate 243 includes an edge portion 2432 and a center portion 2431 . The center portion 2431 is recessed relative to the edge portion 2432 . The center portion 2431 is bonded and fixed to the first accommodating area 24211 , and the edge portion 2432 is bonded and fixed to the first bonding area 24212 .

[0106] In this embodiment, the shape of the reinforcing substrate 243 is designed to adapt to the surface shape of the breathable membrane 242. The reinforcing substrate 243 is bent and extended as a whole, which can better fit the surface shape of the breathable membrane 242 to form a better fixing effect for the breathable membrane 242 containing the core material 241.

[0107] The center portion 2431 of the reinforcing substrate 243 is bonded and fixed to the first accommodating area 24211 , and the edge portion 2432 of the reinforcing substrate 243 is bonded and fixed to the first bonding area 24212 . The bonding and fixing method may be multi-point fixing or surface-to-surface fixing.

[0108] And due to the size limitation of the sealed space 220, and also in order to maximize the absorption area of ​​the core material 241 while keeping the core material 241 of the same volume, after the core material 241 is accommodated in the breathable membrane material 242, the core material 241 as a whole is in the shape of a flat plate, so the degassing element 24 as a whole is in the shape of a flat plate, so as to better accommodate the degassing element 24 in the sealed cavity 220.

[0109] In some embodiments, the degassing element 24 further includes an adhesive layer 244, which is disposed on the side of the reinforcing substrate 243 facing away from the core material 241, and the degassing element 24 is fixed in the sealed cavity 220 through the adhesive layer 244. In this way, the degassing element 24 is easily fixed in the sealed cavity 220, and the risk of displacement of the degassing element 24 in the sealed cavity 220 is reduced. In other embodiments, the degassing element 24 can also be fixed in the sealed cavity 220 by other methods other than gluing.

[0110] In some embodiments, refer again to Figure 6 , the degassing element 24 is fixed to the housing 21, and there is a gap between the degassing element 24 and the protective plate 22. Specifically, the degassing element 24 can be fixed to the housing 21 through the reinforcing substrate 243, and there is a gap between the degassing element 24 and the buffer layer 221 of the protective plate 22. In this embodiment, the degassing element 24 and the protective plate 22 are spaced apart, that is, there is a gap between the breathable membrane 242 and the protective plate 22, so the gas in the sealed cavity 220 can enter the breathable membrane 242 through the gap between the breathable membrane 242 and the protective plate 22. If the degassing element 24 is fixed to the housing 21, and the degassing element 24 is also fixed to the protective plate 22, the contact area between the breathable membrane 242 of the degassing element 24 and the gas in the sealed cavity 220 will be very small, thereby affecting the gas passing through the breathable membrane 242 to react with the core material 241.

[0111] In some embodiments, refer again to Figure 3 The battery box 20 further includes a heat exchanger 25, and a portion of the heat exchanger 25 is located in the sealed cavity 220. The heat exchanger 25 can exchange heat with the box 21, and then exchange heat with the battery cell 10, thereby adjusting the temperature of the battery cell 10.

[0112] In some embodiments, the heat exchange member 25 includes at least one bent and extended heat exchange tube, and the degassing element 24 avoids the heat exchange tube, or the degassing element 24 is spaced apart from the heat exchange tube. The heat exchange member 25 includes at least one bent and extended heat exchange tube to increase the heat exchange area, and the degassing element 24 avoids the heat exchange tube, or the degassing element 24 is spaced apart from the heat exchange tube, to reduce the risk of interference between the degassing element 24 and the heat exchange tube and affecting the heat exchange efficiency of the heat exchange tube.

[0113] The heat exchange tubes of the heat exchange element 25 can be attached to the buffer layer 221 of the protective plate 22 to buffer and protect the heat exchange tubes of the heat exchange element 25, and the buffer layer 221 of the protective plate 22 can also support the heat exchange tubes of the heat exchange element 25 to fix the heat exchange element 25 between the protective plate 22 and the box body 21.

[0114] In some embodiments, refer again to Figure 3The battery box 20 further includes a heat-conducting layer 26 fixed to the box body 21, the heat-conducting layer 26 is located on the side of the box body 21 away from the accommodation space 201, the heat exchange element 25 is in contact with the heat-conducting layer 26, and the degassing element 24 is fixed on the side of the heat-conducting layer 26 away from the box body 21. In this way, the heat of the box body 21 can be transferred to the heat exchange element 25 through the heat-conducting layer 26, thereby increasing the heat exchange effect and heat exchange efficiency.

[0115] To summarize, the battery box 20 provided in the present application includes a box body 21 and a protective plate 22. The protective plate 22 is sealed and connected to the box body 21 to form a sealed cavity 220. By arranging a degassing element 24 in the sealed cavity 220, the degassing element 24 can absorb at least a portion of the gas in the sealed cavity 220, thereby reducing the air pressure in the sealed cavity 220 and reducing the risk of bulging and deformation of the protective plate 22.

[0116] After the degassing element 24 absorbs at least a portion of the gas in the sealed cavity 220, the sealed cavity 220 is in a normal pressure or negative pressure state. When the sealed cavity 220 is in a negative pressure state, due to the support of the heat exchange element 25 on the protective plate 22, the protective plate 22 is difficult to be deformed inward, and the protective plate 22 can still maintain its original shape without deformation.

[0117] The present application also provides a battery device, including a battery box and a battery cell, wherein the battery cell is disposed in a receiving space of the battery box. The battery device can be described in the above description and will not be described here.

[0118] In addition, the present application also provides an electric device, which includes the above-mentioned battery device. The introduction of the electric device can be referred to the above records, and will not be repeated here.

[0119] In the description of the present application, the description with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0120] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery box, characterized in that: The battery box comprises: A box body, formed with a receiving space for receiving a battery cell; A protective plate, located at a side of the box body away from the accommodating space, and sealedly connected to the box body to form a sealed cavity; A degassing element is disposed in the sealed cavity, and is used for absorbing at least part of the gas in the sealed cavity.

2. The battery box according to claim 1, characterized in that: The degassing element includes a core material capable of absorbing the gas through a chemical reaction.

3. The battery box according to claim 2, characterized in that: The degassing element further comprises a breathable membrane material, the breathable membrane material wraps the core material, and the breathable membrane material is used for allowing the gas to pass through.

4. The battery box according to claim 3, characterized in that: The degassing element further comprises a reinforcing substrate fixedly connected to the breathable membrane, the reinforcing substrate surrounds a portion of the breathable membrane and exposes another portion of the breathable membrane, and the reinforcing substrate is connected to at least one of the protective plate and the box body.

5. The battery box according to claim 3, characterized in that: The breathable membrane material comprises a first breathable membrane material and a second breathable membrane material, the first breathable membrane material and the second breathable membrane material together enclose a core material installation cavity, and the core material is located in the core material installation cavity.

6. The battery box according to claim 5, characterized in that: The degassing element further includes a reinforcing substrate, which is fixedly connected to the first breathable membrane and located on a side of the first breathable membrane away from the second breathable membrane to expose the second breathable membrane.

7. The battery box according to claim 6, characterized in that: The first breathable film material has a first laminating area and a first containing area, and the first laminating area is arranged around the periphery of the first containing area; The second breathable membrane material has a second laminating area and a second containing area, and the second laminating area is arranged around the periphery of the second containing area; The first bonding area and the second bonding area are bonded and fixed, and the first accommodating area and the second accommodating area are spaced apart to form the core material installation cavity.

8. The battery box according to claim 7, characterized in that: The reinforcing substrate includes an edge portion and a center portion, the center portion is recessed relative to the edge portion, the center portion is fitted and fixed to the first accommodating area, and the edge portion is fitted and fixed to the first fitting area.

9. The battery box according to claim 4 or 6, characterized in that: The degassing element further comprises a bonding layer, wherein the bonding layer is arranged on a side of the reinforcing substrate facing away from the core material, and the degassing element is fixed in the sealing cavity through the bonding layer.

10. The battery box according to claim 3, characterized in that: The degassing element is fixed to the box body, and a gap is formed between the degassing element and the protection plate.

11. The battery box according to claim 1, characterized in that: The battery box also includes a heat exchange component, and a portion of the heat exchange component is located in the sealed cavity.

12. The battery box according to claim 11, characterized in that: The heat exchange component includes at least one bent and extended heat exchange tube, and the degassing element avoids the heat exchange tube, or the degassing element is spaced apart from the heat exchange tube.

13. The battery box according to claim 12, characterized in that: The battery box further comprises a heat-conducting layer fixed to the box body, the heat-conducting layer is located on a side of the box body away from the accommodation space, and the heat exchange element contacts and cooperates with the heat-conducting layer; The degassing element is fixed to a side of the heat conducting layer facing away from the box body.

14. A battery device, characterized in that: include: A battery box as claimed in any one of claims 1 to 13; The battery cell is arranged in the accommodation space.

15. An electrical device, characterized in that: The battery device comprises the battery device as claimed in claim 14, wherein the battery device is used to provide electrical energy to the electrical device.

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