Battery device and energy storage device

Abstract

The utility model provides a battery device and an energy storage device. The battery device comprises a battery monomer, a box body and a gas treatment device, the gas treatment device is arranged on the box body and can be used for treating gas in the box body; the gas device comprises an oxygen reducing part such as an oxygen consumption material and a polymer gas-permeable membrane, and the oxygen reducing part is used for reducing the oxygen content in the box body to be smaller than the oxygen content outside the box body. The oxygen content in the battery device can be effectively reduced, the risk of thermal runaway detonation of the battery device is reduced, and the safety performance of the battery device is improved.

Description

TECHNICAL FIELD

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

[0002] An energy storage device is used for storing and releasing electric energy, and the storage and release of electric energy are realized by at least one battery device as an energy storage module. The energy storage device using the battery device as the energy storage module has higher requirements for the safety performance of the battery. SUMMARY

[0003] In view of the above problems, the present application provides a battery device and an energy storage device. A gas treatment device is arranged on the battery device to improve the safety of the battery device and thus improve the safety performance of the energy storage device.

[0004] In a first aspect, the present application provides a battery device, comprising battery monomers, a plurality of the battery monomers being arranged to form an energy storage or release element of the battery device; a box body for accommodating a plurality of the battery monomers; and a gas treatment device arranged on the box body and used for treating gas in the box body; wherein the gas treatment device comprises an oxygen reduction component for reducing the oxygen content in the box body to be less than the oxygen content outside the box body.

[0005] In the technical scheme of the present application, the gas treatment device with the oxygen reduction component is arranged on the box body of the battery device, which can reduce the oxygen concentration in the battery device, reduce the possibility of combustion of the battery box, and improve the safety performance of the battery device.

[0006] In some embodiments, the box body comprises a first cavity and a second cavity separated from each other, the battery monomers are arranged to be accommodated in the first cavity, and the gas treatment device is arranged to communicate with the second cavity.

[0007] In one embodiment of the present application, the box body of the battery device comprises a first cavity and a second cavity, the battery monomers are arranged to be accommodated in the first cavity, and the gas treatment device is arranged to communicate with the second cavity. The first cavity can provide a stable accommodation space for the battery monomers, and the second cavity can provide conditions for air circulation in the box body, better guide the circulation of the gas in the box to the gas treatment device, thereby improving the oxygen reduction efficiency in the box body and improving the safety performance of the battery device.

[0008] In some embodiments, the second cavity comprises a first sub-cavity and a second sub-cavity separated from each other, the first sub-cavity at least surrounds the bottom wall of the first cavity, the second sub-cavity at least surrounds the side wall of the first cavity, and the gas treatment device is arranged on the outer side wall of the second sub-cavity.

[0009] The battery device provided by one embodiment of the present application includes a second cavity, which includes a first sub-cavity and a second sub-cavity, and a gas treatment device arranged on the outer side wall of the second sub-cavity. The first sub-cavity can guide the hot gas generated by the battery when it is out of control, and the second sub-cavity can be distinguished from the first sub-cavity, so that the side wall of the gas treatment device can be arranged and the space of the box body is saved. Through the above arrangement, the safety of the battery device is improved and the space is saved.

[0010] In some embodiments, the battery monomer includes a first pressure relief device arranged towards the first sub-cavity; and / or the battery device includes a second pressure relief device arranged on the outer side wall of the second sub-cavity.

[0011] The battery device provided by one embodiment of the present application includes a first pressure relief device arranged towards the first sub-cavity, which can relieve pressure towards the first sub-cavity when the battery monomer is out of control, guide the outflow of the hot gas and other substances generated by the out-of-control battery monomer to the second cavity, and reduce the thermal influence on other battery monomers. The second pressure relief device is arranged on the outer side wall of the second sub-cavity, which can guide the outflow of the hot gas and other substances in the box body. Through the above arrangement, the safety of the battery device is improved.

[0012] In some embodiments, the battery device includes a thermal management component arranged between the battery monomer and the first sub-cavity.

[0013] The battery device provided by one embodiment of the present application includes a thermal management component arranged between the battery monomer and the first sub-cavity, which can improve the thermal management efficiency and safety of the battery monomer.

[0014] In some embodiments, the gas treatment device includes a containing cavity, which is in communication with the internal space of the box body and is isolated from the external space of the box body, and the oxygen reduction component is arranged in the containing cavity.

[0015] The battery device provided by one embodiment of the present application includes an oxygen reduction component arranged in the containing cavity, which can stably reduce the oxygen in the box body and improve the safety and stability of the battery device.

[0016] In some embodiments, the oxygen reduction component includes an oxygen consumption material, which includes an inorganic matrix-based oxygen scavenger and / or an organic matrix-based oxygen scavenger.

[0017] The battery device provided by one embodiment of the present application includes an oxygen reduction component arranged in the containing cavity, which can stably reduce the oxygen in the box body and improve the safety and stability of the battery device.

[0018] In some embodiments, the gas treatment device includes a connecting part detachably connected with the outer side wall of the second sub-cavity.

[0019] The battery device provided by one embodiment of the present application is beneficial to the maintenance and replacement of the gas treatment device, improves the practicability and convenience of the gas treatment device, and improves the stability of the oxygen reduction process of the battery device and the overall safety.

[0020] In some embodiments, the oxygen reduction component includes a high-molecular gas-permeable membrane, and the high-molecular gas-permeable membrane is arranged such that the speed of oxygen in the box permeating through the high-molecular gas-permeable membrane is greater than the speed of nitrogen in the box permeating through the high-molecular gas-permeable membrane.

[0021] The battery device provided by one embodiment of the present application can make the amount of oxygen permeating out of the box greater than the amount of nitrogen permeating out of the box under a slight positive pressure, reduce the oxygen concentration in the box, and improve the safety of the battery device.

[0022] In some embodiments, the high-molecular gas-permeable membrane includes a polyimide membrane, a polyurethane membrane, a polycarbonate membrane, a polytetrafluoroethylene membrane, a silica gel membrane, a polyethylene membrane, a polypropylene membrane, or a composite membrane.

[0023] The battery device provided by one embodiment of the present application can meet the condition that the nitrogen molecule permeation rate of the high-molecular gas-permeable membrane is less than the oxygen molecule permeation rate, and is beneficial to reducing the concentration in the box.

[0024] In some embodiments, the outer side wall of the second sub-chamber includes a through hole, and the high-molecular gas-permeable membrane is arranged to cover the through hole.

[0025] The battery device provided by one embodiment of the present application can arrange the high-molecular gas-permeable membrane without changing the shape of the box, and saves the space of the box.

[0026] In some embodiments, the gas treatment device further includes a reinforcing member, and the reinforcing member is arranged on the outer side wall of the second sub-chamber around the high-molecular gas-permeable membrane and is in communication with the space outside the box.

[0027] The battery device provided by one embodiment of the present application protects the high-molecular gas-permeable membrane at the through hole, and can compensate for the strength loss of the outer side wall of the second sub-chamber due to the through hole, and increase the strength and stability of the box.

[0028] In some embodiments, the gas treatment device further includes an air duct, and the air duct is arranged on the outer side wall of the second sub-chamber and is in communication with the second cavity, so that air can be injected into the second cavity.

[0029] The battery device provided by one embodiment of the present application can maintain a micro-positive pressure in the box, so that oxygen molecules in the box can penetrate through the high-molecular gas-permeable membrane more quickly than nitrogen molecules, thereby reducing the relative proportion of oxygen molecules in the air in the box and improving the safety of the battery device.

[0030] In some embodiments, the oxygen-reducing component further comprises an oxygen-consuming material, the gas treatment device comprises a connecting part detachably connected to the outer side wall of the second sub-chamber, the connecting part is arranged outside the high-molecular gas-permeable membrane, and the connecting part comprises a containing part, and the oxygen-consuming material is arranged in the containing part.

[0031] The battery device provided by one embodiment of the present application can comprehensively utilize the high-molecular gas-permeable membrane and the oxygen-consuming material. When the connecting part is detached, the high-molecular gas-permeable membrane is used for oxygen reduction. After reaching the set balance stage, the connecting part with the oxygen-consuming material can be installed, and oxygen reduction can be performed again. This arrangement can improve the oxygen reduction efficiency of the gas treatment device and save the oxygen-consuming material.

[0032] In a second aspect, the present application provides an energy storage device comprising the above-mentioned battery device.

[0033] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the drawings.

[0035] Figure 1 is a structural schematic diagram of an energy storage device disclosed by one embodiment of the present application;

[0036] Figure 2 is an exploded structural schematic diagram of a battery device disclosed by one embodiment of the present application;

[0037] Figures 3-8 is a structural schematic diagram of six battery devices disclosed by the embodiments of the present application;

[0038] Figure 9 is a structural schematic diagram of a gas treatment device of a battery device disclosed by one embodiment of the present application;

[0039] Figure 10 is a schematic diagram of a gas treatment device structure of another battery device disclosed in an embodiment of the present application;

[0040] Figure 11 is a schematic diagram of a gas treatment device structure of another battery device disclosed in an embodiment of the present application;

[0041] Figure 12 is a schematic diagram of an explosion structure of a gas treatment device of another battery device disclosed in an embodiment of the present application;

[0042] In the drawings, the drawings are not drawn according to the actual proportions.

[0043] Label explanation:

[0044] 1, energy storage device; 100, battery device; 300, controller; 101, control box; 102, battery cluster; 200, battery module;

[0045] 10, box; 11, first box part; 12, second box part; 13, first cavity; 14, second cavity; 141, first sub-cavity; 142, second sub-cavity; 142a, outer side wall; 15, through hole;

[0046] 20, battery monomer; 21, first pressure relief device;

[0047] 30, gas treatment device;

[0048] 31, oxygen reduction component; 311, oxygen-consuming material;

[0049] 312, high molecular gas permeable membrane; 313, gas permeable membrane rubber ring; 314, gas permeable membrane steel ring; 315, gas permeable membrane bolt;

[0050] 32, containing cavity; 33, connecting part; 331, locking switch; 332, movable shaft; 333, locking plug; 334, sealing ring; 335, containing part; 34, reinforcing part; 35, air duct;

[0051] 40, thermal management component;

[0052] 50, second pressure relief device;

[0053] 60, manual maintenance switch. DETAILED DESCRIPTION

[0054] The embodiments of the present application will be further described in detail below in conjunction with the drawings and examples. The detailed description of the following examples and drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described examples.

[0055] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0056] The orientation words appearing in the following description are the directions shown in the drawings, and are not a limitation on the specific structure of the present application. In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] Battery devices are essential devices in modern science and technology and life of human beings, which can not only power some electric devices such as new energy vehicles, but also be used for energy storage devices. The main principle of the battery device is to convert chemical energy and electrical energy to realize charging and discharging, which can store energy or power the device. The battery monomer is the basic energy unit of the battery device. In the charging and discharging process of the battery device, if abnormal conditions such as overcharging, overdischarging, shell damage, battery leakage, etc. occur, a large amount of heat will be generated in the battery monomer inside the battery device, the temperature will rise sharply, and the heat runaway phenomenon will occur. At this time, the heat in the battery monomer is generally released through the pressure relief device on the battery monomer. If the oxygen concentration in the battery device is high, the released substances are prone to react with oxygen, causing deflagration and bringing serious safety hazards.

[0058] Therefore, the battery device will set up related devices to reduce the oxygen content inside the battery device. The existing oxygen reduction device is to introduce high-purity nitrogen gas into the battery device from the outside, so as to achieve the goal of low oxygen inside the battery device. However, this scheme usually requires additional nitrogen making equipment, which not only has high cost, but also occupies the space of the entire electric device or energy storage device due to the large volume, and cannot be widely applied at present.

[0059] Based on this, this application proposes a battery device that uses a gas treatment device with an oxygen reduction component instead of an additional nitrogen generator. This not only allows for a smaller volume and can be configured with the battery device, reducing costs, but also effectively reduces oxygen in the gas inside the casing, thus improving the safety of the battery device.

[0060] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0061] Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Electrical devices can also be energy storage devices, which can be used, but are not limited to, in small-scale, medium-scale, and large-scale industrial and commercial applications, photovoltaic-storage charging stations, and small and medium-sized microgrids, as well as in wind-solar-storage power stations, grid-connected energy storage power stations, and large-scale microgrid power station scenarios, for the purpose of storing and releasing electrical energy.

[0062] It should be understood that the technical solutions described in the embodiments of this application are not limited to the batteries and electrical devices described above, but can also be applied to all batteries including housings and electrical devices using batteries. However, for the sake of brevity, the following embodiments are all described using energy storage devices as examples.

[0063] For example, such as Figure 1 The diagram shown is a structural schematic of an energy storage device 1 according to an embodiment of this application. The energy storage device 1 refers to a device for temporarily or permanently storing energy. The energy storage device 1 may include a control box 101 and a battery cluster 102. The battery cluster 102 may include at least one battery device 100, and optionally may include two or more battery devices 100. The control box 101 can be connected to the battery cluster 102. The control box 101 is used to control and manage the battery devices 100 of the battery cluster 102, such as controlling the on / off state of the battery cluster 102.

[0064] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a battery device 100 provided in one embodiment of this application. To meet different power demands, the battery device 100 may include multiple battery cells 20, which can be connected in series, parallel, or a combination thereof. The battery device 100 may also be referred to as a battery pack. Optionally, multiple battery cells 20 may first be connected in series, parallel, or a combination thereof to form a battery module 200, and then the multiple battery modules 200 may be connected in series, parallel, or a combination thereof to form the battery device 100. That is, multiple battery cells 20 can directly form the battery device 100, or they can first form battery modules 200, and then the battery modules 200 can be combined to form the battery device 100.

[0065] For example, such asFigure 2 The diagram shown is a structural schematic of a battery device 100 according to an embodiment of this application. The battery device 100 may include a plurality of battery cells 20. The battery device 100 may also include a housing 10 (or cover), the housing 10 having a hollow structure inside, and the plurality of battery cells 20 being housed within the housing 10.

[0066] The housing 10 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 10 can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0067] The housing 10 is used to accommodate the battery cell 20, and the housing 10 can have various structures. In some embodiments, the housing 10 may include a first housing portion 11 and a second housing portion 12, which overlap each other, and together define a receiving space for accommodating the battery cell 20. The second housing portion 12 may be a hollow structure with one end open, and the first housing portion 11 may be a plate-like structure, with the first housing portion 11 covering the open side of the second housing portion 12 to form a housing 10 with a receiving space; alternatively, both the first housing portion 11 and the second housing portion 12 may be hollow structures with one side open, with the open side of the first housing portion 11 covering the open side of the second housing portion 12 to form a housing 10 with a receiving space. Of course, the first housing portion 11 and the second housing portion 12 can have various shapes, such as cylinders, cuboids, etc.

[0068] To improve the sealing performance after the first housing part 11 and the second housing part 12 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 11 and the second housing part 12.

[0069] Assuming that the first box part 11 covers the top of the second box part 12, the first box part 11 can also be called the upper box cover, and the second box part 12 can also be called the lower box 10.

[0070] In the battery device 100, the battery cell 20 can be one or multiple. If the battery cell 20 is multiple, the multiple battery cells 20 can be connected in series, in parallel or in a mixed connection. The mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole of the multiple battery cells 20 is accommodated in the box 10. Of course, the multiple battery cells 20 can be first connected in series, in parallel or in a mixed connection to form a battery module 200, and then the multiple battery modules 200 are connected in series, in parallel or in a mixed connection to form a whole and are accommodated in the box 10.

[0071] In some embodiments, as shown in FIG. 1, the battery cell 20 is multiple, and the multiple battery cells 20 are first connected in series, in parallel or in a mixed connection to form a battery module 200. The multiple battery modules 200 are then connected in series, in parallel or in a mixed connection to form a whole and are accommodated in the box 10. Figure 2

[0072] The multiple battery cells 20 in the battery module 200 can be electrically connected through a busbar component to realize the parallel connection, series connection or mixed connection of the multiple battery cells 20 in the battery module 200.

[0073] In this application, the battery cell 20 can include a lithium ion battery cell, a sodium ion battery cell or a magnesium ion battery cell, etc. The embodiments of this application are not limited in this regard. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The embodiments of this application are not limited in this regard. The battery cell 20 is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell 20 and soft package battery cell. The embodiments of this application are not limited in this regard.

[0074] Referring to FIGS. 1 and 2, Figure 2 and Figure 3 The embodiments of this application disclose a battery device 100. The battery device 100 includes a battery cell 20, a box 10 and a gas treatment device 30. The multiple battery cells 20 are arranged to form an energy storage or release unit of the battery device 100. The box 10 is used to accommodate the multiple battery cells 20. The gas treatment device 30 is arranged on the box 10 and is used to treat the gas in the box 10. The gas treatment device 30 includes an oxygen reduction component 31, which is used to reduce the oxygen content in the box 10 to be less than the oxygen content outside the box 10.

[0075] ​The battery device 100 can be a device that stably stores or releases electric energy, can stably supply power to an electric device, and can be used in an energy storage system. The battery device 100 can further include a thermal management component 40 such as a water cooling plate, an air cooling plate, etc., for regulating heat inside the battery device 100, which can be arranged inside the box 10 to regulate heat for the battery monomer 20 and / or outside the box 10 to regulate heat for the box 10. The battery device 100 can further include a pressure relief device 50 such as a balance valve, a pressure relief valve, an explosion-proof valve, etc., which can be exemplarily a second pressure relief device 50 of the present application. The second pressure relief device 50 can be arranged on the box 10, and the arrangement position can be a side wall, a top wall or a bottom wall of the box 10. When the pressure inside the box 10 is too large, the pressure can be released to reduce the risk of explosion of the box 10.

[0076] The battery monomer 20 can be an energy storage or release unit of a battery, and can be a basic unit constituting the battery module 200 and the battery device 100. The battery monomer 20 can realize mutual conversion between chemical energy and electric energy through internal chemical substance reaction.

[0077] The structure and packaging form of the battery monomer 20 can be cylindrical, square or soft package, etc. The electrochemical system inside the battery monomer 20 can be a lithium ion battery system, a lead-acid battery system, a nickel-cadmium battery system, a nickel-hydrogen battery system, a fuel cell system, a solid-state battery system and other electrochemical systems that can stably supply power.

[0078] The battery monomer 20 can further include a first pressure relief device 21 such as a pressure relief valve, an explosion-proof valve, etc. The first pressure relief device 21 is arranged on the shell of the battery monomer 20, and can be a metal foil attached to the shell or a weak part directly formed on the shell. When the pressure inside the battery monomer 20 is too large, the first pressure relief device 21 can realize directional pressure release, reduce the probability of chain thermal reaction of the battery device 100 caused by thermal runaway of the battery monomer 20, and reduce the risk of explosion of the battery device 100.

[0079] In the embodiments of the present application, the box 10 can be used to accommodate the battery monomer 20. Exemplarily, the box 10 can include a first box part 11 and a second box part 12, the first box part 11 and the second box part 12 are mutually covered, and the first box part 11 and the second box part 12 jointly define an accommodation space for accommodating the battery monomer 20. The second box part 12 can be a hollow structure with one end open, and the first box part 11 can be a plate structure. The first box part 11 covers the open side of the second box part 12 to form a box with an accommodation space. The first box part 11 and the second box part 12 can also be a hollow structure with one side open, and the open side of the first box part 11 covers the open side of the second box part 12 to form a box with an accommodation space. Of course, the first box part 11 and the second box part 12 can be various shapes, such as a cylinder, a cuboid, etc. In order to improve the sealing performance of the first box part 11 and the second box part 12 after being connected, a sealing member such as sealing glue, a sealing ring, etc. can be arranged between the first box part 11 and the second box part 12.

[0080] The gas treatment device 30 is arranged on the box 10 and can be arranged on any wall surface of the box 10, and at least part of the gas treatment device 30 is in communication with the internal space of the box 10. The connection mode of the gas treatment device 30 and the box 10 includes but is not limited to fastener connection such as screw, welding, or buckle connection, which can be detachable connection, or can be integrally formed with the box 10, or non-detachable welding, bonding, etc. Connection mode. At least part of the gas treatment device 30 is in communication with the inside of the box 10 to treat the gas in the inside of the box 10. The gas treatment device 30 can be in communication with the external air, or be isolated from the external air, or be converted between isolation and communication with the external air through the connecting part 33.

[0081] Exemplarily, the box 10 is a cuboid structure, and the gas treatment device 30 can be arranged on the wall in communication with the inside of the box 10, for example, can be arranged on any one of the side wall, the bottom wall and the top wall of the box 10. In order to increase the efficiency of gas treatment, the battery device 100 can include a plurality of gas treatment devices 30. The gas treatment device 30 can be an integrally formed component, or can include a plurality of sub-components assembled by a plurality of sub-components.

[0082] The gas treatment device 30 is used to treat the gas in the box 10. The treatment mode can be to introduce external gas such as air, nitrogen or other inert gas into the inside of the box 10, and to make the external gas exchange with the air in the inside of the box 10 through the high molecular gas permeable membrane 312, so as to reduce the oxygen content in the inside of the box 10. The treatment mode can also be to arrange a material that can react with gas in the gas treatment device 30, such as oxygen-consuming material 311, etc. The oxygen-consuming material 311 reacts with the oxygen in the air in the inside of the box 10 to reduce the oxygen content in the inside of the box 10.

[0083] The oxygen-reducing component 31 can reduce the oxygen concentration inside the box 10. The gas processing device 30 can reduce the oxygen content inside the box 10 by the oxygen-reducing component 31. Exemplarily, the oxygen-reducing component 31 can include an oxygen-consuming material 311 or a high-molecular gas-permeable film 312. The oxygen-consuming material 311 can react with oxygen chemically to consume the oxygen inside the box 10, and can include iron powder, organic deoxidizer, etc. The high-molecular gas-permeable film 312 can separate different gas molecules, such as nitrogen molecules and oxygen molecules, by using the difference in permeation rate of the different gas molecules through the high-molecular gas-permeable film 312. In this embodiment, to replace the oxygen inside the box 10, the inside of the box 10 can be set to a positive pressure environment to a certain extent compared to the outside of the box 10, so that the oxygen inside the box 10 can flow out of the box 10 more smoothly.

[0084] It can be understood that the oxygen content can be the number of oxygen molecules per unit volume, or the ratio of the number of oxygen molecules to the total number of gas molecules per unit volume, which can be measured by a conventional measurement method.

[0085] According to Embodiment 1 of the present application, the battery device 100 is subjected to oxygen-reducing treatment by the gas processing device 30 with the oxygen-reducing component 31, which reduces the oxygen content inside the box 10 and reduces the risk of uncontrolled deflagration of the battery device 100. At the same time, the gas processing device 30 is arranged on the box 10, so that no oxygen-reducing equipment is needed outside the box 10, thereby saving the space of the battery device 100.

[0086] Reference Figure 3 and Figure 4 The battery device 100 disclosed in the embodiments of the present application includes a box 10 including a first cavity 13 and a second cavity 14 separated from each other. The battery cell 20 is arranged to be accommodated in the first cavity 13. The gas processing device 30 is arranged to communicate with the second cavity 14.

[0087] The box 10 includes the first cavity 13 and the second cavity 14 separated from each other, which means that the space inside the box 10 is divided into the first cavity 13 and the second cavity 14 by a partition plate or a water-cooling plate, etc.

[0088] The first cavity 13 is used to accommodate the battery cell 20, which can be a cuboid structure or other columnar structure.

[0089] The second cavity 14 is the cavity of the box 10 except the first cavity 13, which can provide a space for gas processing inside the battery device 100. The second cavity 14 can be divided into a first sub-cavity 141 and a second sub-cavity 142 according to the positional relationship with the first cavity.

[0090] The gas treatment device 30 is arranged in communication with the second cavity 14. The gas treatment device 30 can achieve treatment of the air inside the box 10 through the second cavity 14. Exemplarily, the gas treatment device 30 can be arranged on the side wall of the box 10 in contact with the second cavity 14.

[0091] According to the embodiment 2 of the present application, the space inside the box 10 is divided into the first cavity 13 and the second cavity 14, the first cavity 13 contains the battery monomer 20, which is conducive to the stable containment of the battery monomer 20. The second cavity 14 is in communication with the gas treatment device 30, which can guide the gas inside the box 10 to flow to the gas treatment device, which is conducive to improving the efficiency of the oxygen reduction component 31 in the gas treatment device 30 to reduce the oxygen inside the box 10, thereby improving the safety performance of the battery device 100.

[0092] With reference to Figures 3-8 The embodiment of the present application discloses a battery device 100, and the second cavity 14 includes a first sub-cavity 141 and a second sub-cavity 142. The first sub-cavity 141 at least surrounds the bottom wall of the first cavity 13. The second sub-cavity 142 at least surrounds the side wall of the first cavity 13. The gas treatment device 30 is arranged on the outer side wall 142a of the second sub-cavity 142.

[0093] The first sub-cavity 141 refers to a cylindrical cavity in the second cavity 14 that at least surrounds the bottom wall of the first cavity 13, which is used to contain the air below the battery monomer 20 in the box 10. The bottom wall of the first cavity 13 can be a water-cooled plate or a partition plate that bears the weight of the battery monomer 20, or a water-cooled plate or a partition plate that contacts the bottom surface of the battery monomer 20. Exemplarily, the cavity above the water-cooled plate is the first cavity 13, which is used to contain the battery monomer 20. The cavity below the water-cooled plate is the first sub-cavity 141 of the second cavity 14.

[0094] The second sub-cavity 142 is a cavity in the second cavity 14 that at least surrounds the side wall of the first cavity 13, which is used to contain the air to the side of the battery monomer 20 in the box 10. The side wall of the first cavity 13 can be a plate-like structure, such as a partition plate or a water-cooled plate, which is arranged vertically at the edge of the group of battery monomers 20 or the group of battery modules 200.

[0095] The gas treatment device 30 is arranged on the outer side wall 142a of the second sub-cavity 142, which can treat the air inside the box 10. The outer side wall 142a is the side wall of the second sub-cavity 142 close to the outside of the box 10.

[0096] According to the embodiment 3 of the present application, through the above arrangement, it is conducive to the stacking and centralized placement of the box 10, and the intensive use of the space of the battery device 100, and it is conducive to the installation, disassembly, maintenance and other operations of the gas treatment device 30 in the battery device 100.

[0097] With reference to Figures 3-8The battery device 100 includes a first pressure relief device 21, and / or the battery device 100 includes a second pressure relief device 50.

[0098] The first pressure relief device 21 is a device for relieving the pressure of the battery cell 20 when the internal pressure is too high. The first pressure relief device 21 can be a pressure relief valve, an explosion-proof valve, or the like.

[0099] The first pressure relief device 21 is arranged towards the first sub-chamber 141. The direction of the pressure relief device refers to the direction in which the pressure relief device is arranged on a certain face of the battery cell 20 towards the outside of the battery cell 20, guiding the direction of the pressure relief of the battery cell 20 when thermal runaway occurs.

[0100] Exemplarily, the battery cell 20 is a square shell structure, and the first sub-chamber 141 is arranged below the battery cell 20. The first pressure relief device 21 is arranged on the bottom face of the battery cell 20. The first pressure relief device 21 on the bottom face can guide the heat of the battery cell 20 to be relieved to the first sub-chamber 141 of the second cavity 14 when thermal runaway occurs.

[0101] The second pressure relief device 50 is a device for relieving the pressure of the battery device 100 when the internal pressure is too high. The second pressure relief device 21 can be a balance valve, a pressure relief valve, an explosion-proof valve, or the like. The second pressure relief device 50 is arranged on the outer side wall 142a of the second sub-chamber 142, and can guide the release of the pressure and the substance in the second sub-chamber 142.

[0102] According to Embodiment 4 of the present application, by the above arrangement, the direction of the pressure relief of the battery cell 20 is guided to the first sub-chamber 141 of the second cavity 14; and / or the direction of the pressure relief of the battery device 100 is guided to the side of the box body 10. The above arrangement can improve the orderliness of the pressure relief, reduce the influence of the excessive pressure on other battery cells 20 and / or other battery devices 100, and improve the safety performance of the battery device 100.

[0103] Reference Figures 3-8 The battery device 100 includes a thermal management component 40 between the battery cell 20 and the first sub-chamber 141.

[0104] The thermal management component 40 can adjust the heat of the battery device 100. The thermal management component 40 can be a water-cooled plate, a liquid-cooled plate, a metal heat-conducting plate, a composite heat-conducting plate, and other components that can adjust the heat inside the battery device 100.

[0105] The heat management component 40 is located between the battery monomer 20 and the first sub-chamber 141, and can achieve heat conduction by being in contact with the battery monomer 20. For example, in the box 10 of the battery device 100, the bottom surface of the battery monomer 20 is in contact with the water cooling plate. The water cooling plate can adjust the heat of the battery monomer 20.

[0106] According to the embodiment 5 of the present application, through the above arrangement, the heat management of the battery monomer 20 is facilitated, and the safety performance of the battery device 100 is improved.

[0107] Referring to Figures 4-6 The battery device 100 disclosed in the embodiments of the present application includes a gas treatment device 30 including a containing cavity 32. The containing cavity 32 is in communication with the internal space of the box 10 and is isolated from the external space of the box 10. The oxygen reduction component 31 is arranged in the containing cavity 32.

[0108] The gas treatment device 30 includes a containing cavity 32. The containing cavity 32 is a cavity structure that can contain a certain volume. The containing cavity 32 can be a sphere, a hemisphere, a cube, an irregular body, or other cavity structures that can contain substances. The containing cavity 32 can provide a space for the arrangement of the oxygen reduction component 31, and the oxygen reduction component 31 can be stably stored in the containing cavity 32 by effective fixing methods such as placement, bonding, and buckling. The containing cavity 32 is in communication with the internal space of the box 10 and is isolated from the external space of the box 10. The oxygen reduction component 31 can achieve closed oxygen reduction treatment for the battery device 100. The containing cavity 32 can be provided with a structure with holes, such as a plate-like or mesh-like structure with holes, to limit the oxygen reduction component 31 from entering the internal space of the box 10 through the containing cavity 32.

[0109] According to the embodiment 6 of the present application, through the above arrangement, the gas treatment device 30 can stably arrange the oxygen reduction component 31, provide favorable conditions for the sealing treatment of the gas in the box, improve the efficiency of oxygen reduction in the box 10, and further improve the safety performance of the battery device 100.

[0110] Referring to Figures 4-6 and Figure 9 The battery device 100 disclosed in the embodiments of the present application includes an oxygen reduction component 31 including an oxygen consumption material 311. The oxygen consumption material 311 includes an inorganic substrate-based deoxidizer and / or an organic substrate-based deoxidizer.

[0111] The oxygen consumption material 311 refers to a material that can undergo an oxidation-reduction reaction with oxygen or a material that can adsorb oxygen, including an inorganic substrate-based deoxidizer and / or an organic substrate-based deoxidizer. The inorganic substrate-based deoxidizer includes iron powder, a sulfite-based deoxidizer, etc.

[0112] Exemplarily, the oxygen-consuming material 311 can include iron powder and sodium chloride. The iron powder can have a redox reaction with oxygen to consume oxygen, and the sodium chloride can accelerate the reaction as a catalyst. One gram of iron powder can remove about 300 cubic centimeters of oxygen in a closed space after complete oxidation. The mass of the iron powder can be selected according to the volume of the free space in the box 10, and can be redundantly designed by 1.2-3 times the required mass. The deoxidizer based on the organic matrix includes enzymes, ascorbic acid, oleic acid, and other inorganic substances that can have a redox reaction with oxygen.

[0113] The oxygen-consuming material 311 can be arranged inside the battery box 10, or arranged in the containing cavity 32 of the gas treatment device 30. Since the containing cavity 32 of the gas treatment device 30 is in communication with the box 10 and isolated from the external space, the oxygen-consuming material 311 can reduce the oxygen in the battery device 100 in a closed manner.

[0114] The oxygen-consuming material 311 can also be arranged in the manual maintenance switch 60 by bonding, placing, etc. The manual maintenance switch 60 can quickly disconnect the connection of the high-voltage circuit when the technician maintains the battery device 100. The connection structure of the manual maintenance switch 60 is usually a quick plug. After the manual maintenance switch 60 is connected, it is in communication with the gas in the box 10, and the internal oxygen-consuming material 311 can consume the oxygen in the box 10. With the opening of the manual maintenance switch 60, the oxygen-consuming material 311 can be replaced and maintained, and the space is intensive.

[0115] According to the embodiment 7 of the present application, by the above arrangement, the oxygen content in the box 10 is reduced, and the safety performance of the battery device 100 is improved.

[0116] With reference to Figure 5 、 Figure 8 、 Figure 9 、 Figure 11 and Figure 12 , the battery device 100 disclosed by the embodiments of the present application includes a connecting part 33 which is detachably connected with the outer side wall 142a of the second sub-chamber 142.

[0117] The connecting part 33 refers to a part by which the gas treatment device 30 and the box 10 are detachably connected. The connecting part 33 can be a buckle, a bolt, a plug, or other structures that can effectively connect.

[0118] Exemplarily, the connecting part 33 can be a plug structure. The connecting part 33 includes a locking switch 331, a movable shaft 332, a locking plug 333, and a sealing ring 334.

[0119] The lock switch 331 is in the shape of an L. The outer corner of the lock switch 331 can be rounded, and the surface can be provided with concave and convex structures to increase the frictional contact area. The material of the lock switch 331 can be rubber or a hard body coated with rubber, such as plastic coated with rubber or iron coated with rubber.

[0120] The movable shaft 332 is hingedly connected to one end of the lock switch 331 and the other end of the outer side wall 142a of the second sub-chamber 142.

[0121] The lock plug 333 is between the lock switch 331 and the outer side wall 142a of the second sub-chamber 142. The lock switch 331 can be rotated to control the pressing of the lock plug 333, thereby achieving the connection or disconnection of the connection part 33. The accommodation cavity 32 can be provided in the lock plug 333, and the setting and replacement of the oxygen-consuming material 311 can be achieved.

[0122] The sealing ring 334 can be provided between the lock plug 333 and the outer side wall 142a of the second sub-chamber 142 to improve the sealing performance during connection.

[0123] According to Embodiment 8 of the present application, the above-mentioned arrangement can achieve detachable connection between the gas treatment device 30 and the box body 10, thereby improving the reusability and maintainability of the gas treatment device 30, and further saving the cost of oxygen reduction treatment of the battery device 100.

[0124] Referring to Figure 7 , Figure 8 , Figure 10 , Figure 11 and Figure 12 , the battery device 100 disclosed in the embodiments of the present application includes a high-molecular gas-permeable film 312 in the oxygen reduction component 31. The high-molecular gas-permeable film 312 is arranged such that the speed of oxygen in the box body 10 permeating through the high-molecular gas-permeable film 312 is greater than the speed of nitrogen in the box body 10 permeating through the high-molecular gas-permeable film 312.

[0125] The high-molecular gas-permeable film 312 is a thin film material with selective permeation function made of high-molecular polymers through a specific process. The high-molecular gas-permeable film 312 uses polyethylene, polypropylene, polytetrafluoroethylene, etc. as the main raw material, and forms a large number of small pores in the film through stretching, microporous molding, etc.

[0126] The high-molecular gas-permeable film 312 is arranged such that the speed of oxygen in the box body 10 permeating through the high-molecular gas-permeabie film 312 is greater than the speed of nitrogen in the box body 10 permeating through high-molecular gas-permeable film 312. Due to the difference in molecular diameter, the oxygen and nitrogen molecules have different dissolution and diffusion rates in the high-molecular gas-permeable film 312. The diameter of the oxygen molecule is smaller than that of the nitrogen molecule. When the internal gas pressure of the box body 10 is set to be greater than the external gas pressure, the permeation rate of the oxygen molecule in the high-molecular gas-permeable film 312 is greater than that of the nitrogen molecule.

[0127] The battery device 100 can achieve micro-positive pressure by inputting air into the inside of the case 10, so that the inside of the case 10 is greater than the outside. The battery cell 20 also causes the inside of the case 10 to be greater than the outside when thermal runaway occurs. The rate of oxygen permeation to the outside is greater than that of nitrogen. The high-molecular gas-permeable membrane 312 can reduce the oxygen content in the inside of the case 10.

[0128] The high-molecular gas-permeable membrane 312 can be arranged on the outer side wall 142a of the second sub-chamber 142. The outer side wall 142a can be provided with a through hole 15. Exemplarily, the high-molecular gas-permeable membrane 312 can be fixed on the outer side wall 142a by a gas-permeable membrane rubber ring 313, a gas-permeable membrane steel ring 314, and a gas-permeable membrane bolt 315, and cover the through hole 15 opened on the case 10.

[0129] According to Embodiment 9 of the present application, through the above arrangement, the battery device 100 can release gas outward when the internal pressure rises, and is conducive to reducing the relative oxygen content in the inside of the case 10, and improving the safety and stability of the battery device 100.

[0130] With reference to Figure 7 , Figure 8 , Figure 10 and Figure 11 , the battery device 100 disclosed in the embodiments of the present application includes a polyimide film, a polyurethane film, a polycarbonate film, a polytetrafluoroethylene film, a silicone film, a polyethylene film, a polypropylene film, or a composite film.

[0131] The polyimide film refers to a kind of high-molecular polymer film containing imide rings, which is prepared by condensation polymerization of diacid anhydride and diamine. The polyimide film has strong molecular chain rigidity and compact structure, and has certain selective permeability to nitrogen and oxygen molecules due to different solubility and diffusion capacity of nitrogen and oxygen molecules. For example, under a pressure difference of 0.5 MPa, oxygen can pass through the polyimide film at a higher rate to achieve nitrogen and oxygen separation.

[0132] The polyurethane film refers to a kind of high-molecular polymer film containing urethane groups in the main chain, which is synthesized by reaction of diisocyanate, polyol and chain extender. The polyurethane film has micro-phase separation structure, which endows different solubility and diffusion capacity to nitrogen and oxygen. For example, under a pressure difference of about 0.3 MPa, oxygen and nitrogen are separated by taking advantage of the difference in solubility and diffusion rate in the film.

[0133] The polycarbonate film refers to a kind of high-molecular polymer film containing carbonate groups in the molecular chain, which is prepared by condensation polymerization of bisphenol A and phosgene or diphenyl carbonate. For example, under a pressure difference of about 0.4 MPa, oxygen and nitrogen pass through the polycarbonate film at different rates based on the solubility and diffusion mechanism.

[0134] Polytetrafluoroethylene membrane refers to a fluoropolymer film polymerized from tetrafluoroethylene monomers. The expanded polytetrafluoroethylene membrane formed through a stretching process has a large number of micropores, and nitrogen and oxygen can be separated by the size sieving effect of the micropores.

[0135] Silica gel membrane refers to a rubbery polymer film mainly composed of polysiloxane. Nitrogen and oxygen molecules have different solubility coefficients and diffusion coefficients in the membrane, so that nitrogen and oxygen can be separated under the action of a pressure difference of 0.2 MPa.

[0136] Polyethylene membrane refers to a thermoplastic polymer film polymerized from ethylene monomers. For example, a low-density polyethylene membrane has a certain separation capacity for nitrogen and oxygen under a pressure difference of 0.35 MPa.

[0137] Polypropylene membrane refers to a thermoplastic polymer film polymerized from propylene monomers. Nitrogen and oxygen are separated by the difference in solubility and diffusion in the membrane. For example, a biaxially stretched polypropylene membrane can effectively separate nitrogen and oxygen under a pressure difference of about 0.45 MPa.

[0138] Composite membrane refers to a membrane composed of two or more different materials. By reasonably designing the materials of each layer, the solubility, diffusion, and sieving characteristics of different materials for nitrogen and oxygen are utilized to achieve high-efficiency separation of nitrogen and oxygen under certain pressure and temperature conditions. For example, a membrane composed of polyimide and polyvinyl alcohol can significantly improve the separation efficiency of nitrogen and oxygen under a pressure difference of 0.5 MPa.

[0139] According to the embodiments of the present application Figure 7 , Figure 8 , Figure 10 , Figure 11 and Figure 12 , the above arrangement can make the battery device 100 release more oxygen than nitrogen under positive pressure conditions, thereby reducing the relative oxygen content in the box body 10 and improving the safety of the battery device 100.

[0140] With reference to Figures 3-8 , the present application discloses a battery device 100, wherein the outer side wall 142a of the second sub-chamber 142 comprises a through hole 15, and a high-molecular gas-permeable membrane 312 is arranged to cover the through hole 15.

[0141] The through hole 15 is a kind of through structure on the shell, which can exchange substances inside and outside the shell. The through hole 15 is arranged on the outer side wall 142a of the second sub-chamber 142, which can communicate the air inside and outside the box body 10. The shape, size and number of the through hole 15 can be determined comprehensively according to the size of the battery box 10, the gas production of the battery pack, the specification of the gas-permeable membrane and the expected gas permeation amount, etc. The high-molecular gas-permeable membrane 312 is arranged to cover the through hole 15, which can reduce the oxygen content inside the box body 10 under positive pressure conditions.

[0142] Exemplarily, the outer side wall 142a of the second sub-chamber 142 comprises a circular through hole 15 with a diameter of 5 cm, and a high-molecular gas-permeable film 312 is fixedly connected to the inside of the outer side wall 142a of the second sub-chamber 142 by a gas-permeable film bolt 315, a gas-permeable film steel ring 314 and a gas-permeable film rubber ring 313, and completely seals and covers the 5 cm circular through hole 15.

[0143] According to Embodiment 11 of the present application, the above-mentioned arrangement makes the volume of the battery device 100 after the addition of the gas treatment device 30 change less, and intensifies the space of the battery device 100.

[0144] With reference to Figure 7 and Figure 10 , the present application discloses a battery device 100, and the gas treatment device 30 further comprises a reinforcing member 34. The reinforcing member 34 is arranged on the outer side wall 142a of the second sub-chamber 142 around the high-molecular gas-permeable film 312 and communicates with the space outside the box body 10.

[0145] The reinforcing member 34 is composed of a material with high strength and high toughness, including but not limited to metal, alloy, fiber reinforced composite material, etc., and the same material as the box body 10 can also be used. The connecting mode of the reinforcing member 34 and the outer side wall 142a of the second sub-chamber 142 can be welding, bolt connection, riveting, integral connection, etc. The shape and size of the reinforcing member 34 can be designed according to the through hole 15. For example, a circular or annular reinforcing member 34 is arranged around the circular through hole 15 to reinforce the through hole. A square or rectangular reinforcing member 34 is arranged around the square through hole 15 to support the four sides of the through hole 15. A support bar or support grid can also be arranged in the middle of the reinforcing member 34.

[0146] According to Embodiment 12 of the present application, the above-mentioned arrangement is beneficial to enhancing the structural strength of the box body 10 of the battery device 100, optimizing stress distribution, reducing stress concentration phenomenon caused by the existence of the through hole 15, improving the overall stability of the structure, reducing the risk of deformation caused by the discontinuity of the structure due to the hole, and further improving the safety and stability of the battery device 100.

[0147] With reference to Figure 7 , Figure 8 , Figure 10 , Figure 11 and Figure 12 , the present application discloses a battery device 100, and the gas treatment device 30 further comprises a ventilation pipeline 35. The ventilation pipeline 35 is arranged on the outer side wall 142a of the second sub-chamber 142 and communicates with the second cavity 14, so that air can be injected into the second cavity 14.

[0148] The ventilation duct 35 is a tubular structure used to guide and transport gas. The ventilation duct 35 enables air circulation, gas transmission, and ventilation between the inside and outside of the housing 10. The ventilation duct 35 can be made of metal or alloy, plastic, rubber, or composite materials. The cross-sectional shape of the ventilation duct 35 can be circular, rectangular, or other shapes that effectively transport gas. The ventilation duct 35 is located on the outer wall 142a of the second sub-chamber 142 and can be connected by welding, flange connection, threaded connection, socket connection, mechanical locking, or other methods. When an external ventilation device is configured, the ventilation duct 35 can introduce air into the housing 10. The housing 10 can achieve a slight positive pressure, and the polymer breathable membrane 312 can reduce the internal oxygen content.

[0149] According to Embodiment 13 of this application, air can be stably introduced into the housing 10 through the ventilation pipe 35, thereby achieving a micro-positive pressure condition inside the battery device 100 in conjunction with the polymer breathable membrane 312, which can reduce the oxygen content inside the housing 10 and improve the safety and stability of the battery device 100.

[0150] refer to Figure 8 , Figure 11 and Figure 12 This application discloses a battery device 100, in which the oxygen reduction component 31 further includes an oxygen-consuming material 311. The gas treatment device 30 includes a connection portion 33 detachably connected to the outer wall 142a of the second sub-chamber 142. The connection portion 33 is disposed on the outer side of the polymer breathable membrane 312, and includes a receiving portion 335. The oxygen-consuming material 311 is disposed within the receiving portion 335.

[0151] The oxygen reduction component 31 also includes an oxygen-consuming material 311, meaning that the oxygen reduction component 31 includes an oxygen-consuming material 311 in addition to the polymer breathable membrane 312.

[0152] The gas handling device 30 includes a connection portion 33 detachably connected to the outer wall 142a of the second sub-chamber 142. The connection portion 33 is located on the outside of the polymer breathable membrane 312, allowing the chamber 142a to be sealed. The connection portion 33 includes a receiving portion 335 for receiving oxygen-consuming material 311. Understandably, the receiving portion 335 communicates with the polymer breathable membrane 312 and is isolated from the external space. The oxygen-consuming material 311 can consume oxygen inside the chamber 10 in a sealed environment.

[0153] According to the embodiment 14 of the present application, by the above setting, the battery device 100 can combine the characteristics of the high-molecular gas-permeable film 312 and the oxygen-consuming material 311 in the consumption box to reduce the oxygen content by continuously introducing air into the box 10 to achieve a slight positive pressure in the box space in the ventilation state without installing the connecting part 33. The battery device 100 can install the connecting part 33 to isolate the box 10 from the outside air in the air-tight state, and consume the oxygen in the box 10 by using the oxygen-consuming material 311. The battery device 100 can reduce the oxygen in the two states, and can save the consumption of the oxygen-consuming material 311.

[0154] With reference to Figure 8 , Figure 11 and Figure 12 , the battery device 100 disclosed by the embodiment of the present application comprises a battery cell 20, a box 10, a gas treatment device 30, a heat management component 40, and a second pressure relief device 50.

[0155] The battery cell 20 comprises a first pressure relief device 21. The first pressure relief device 21 is a notched explosion-proof valve located on the bottom wall of the battery cell 20, which guides the direction of the thermal runaway battery cell pressure relief downward. The battery cell 20 is arranged and placed on the water-cooled plate of the heat management component 40.

[0156] The box 10 comprises a first cavity 13, a second cavity 14, and a through hole 15. A plurality of battery cells 20 are arranged and placed in the first cavity 13 of the box 10. The first cavity 13 is a cavity space for placing the battery cell 20 on the upper part of the water-cooled plate. The second cavity 14 is a cavity space in the box 10 except the first cavity. The second cavity 14 comprises a first sub-cavity 141 and a second sub-cavity 142. The first sub-cavity 141 is arranged around the bottom wall of the first cavity 13, and the second sub-cavity 142 is a cavity space in the second cavity 14 except the first sub-cavity 141. The second sub-cavity 142 comprises an outer side wall 142a. The outer side wall 142a is the side wall of the second sub-cavity 142 close to the outside of the box 10.

[0157] The gas treatment device 30 is arranged on the outer side wall 142a. The outer side wall 142a comprises the through hole 15. The through hole 15 is a circular structure with a diameter of 5 cm.

[0158] The second pressure relief device 50 is a notched balance valve located on the outer side wall 142a of the second sub-cavity 142.

[0159] The heat management component 40 is a water-cooled plate located between the battery cell 20 and the first sub-cavity 141. The battery cell 20 is above the water-cooled plate, and the first sub-cavity 141 is below the water-cooled plate. The battery cell 20 is placed on the water-cooled plate, and the water-cooled plate adjusts the temperature of the battery device 100 by circulating liquid.

[0160] The gas treatment device 30 comprises a reduced-oxygen component 31, a ventilation pipe 35 and a connecting part 33. The reduced-oxygen component 31 comprises a high-molecular gas-permeable film 312 and an oxygen-consuming material 311. The high-molecular gas-permeable film 312 is a polyurethane film. The high-molecular gas-permeable film 312 is connected to the outer side wall 142a by a gas-permeable film bolt 315, a gas-permeable film steel ring 314 and a gas-permeable film rubber ring 313, and covers the through hole 15 completely inside the box 10. The ventilation pipe 35 is a plastic round pipe, which is connected to the outer side wall 142a by a flange. The ventilation pipe 35 is not overlapped with the through hole 15, and the ventilation pipe 35 can be controlled by an external ventilation device to control whether air is introduced into the box 10 or not, i.e. in a closed state.

[0161] The oxygen-consuming material 311 is iron powder. The connecting part 33 is in the form of a plug, which corresponds to the through hole 15 of the box 10 and is arranged outside the outer side wall 142a of the second sub-chamber 142. After the connecting part 33 is connected, it can completely cover the through hole 15, so as to realize the sealing of the box 10.

[0162] The connecting part 33 comprises a locking switch 331, a movable shaft 332, a locking plug 333, a sealing ring 334 and a containing part 335. The locking switch 331 is in the shape of an L, with the outer corner being rounded and the surface being concave-convex. The locking switch 331 is made of hard plastic with a rubber coating. The movable shaft 332 is made of stainless steel and is in the shape of a U. The movable shaft 332 is connected to the inside of the locking switch 331 at the bottom side and is hinged to the outer side wall 142a of the second sub-chamber 142 at the top side. The locking plug 333 is between the locking switch 331 and the outer side wall 142a of the second sub-chamber 142. The locking switch 331 is connected or detached from the connecting part 33 by rotating and pressing or relaxing. The sealing ring 334 is arranged between the locking plug 333 and the outer side wall 142a. The containing part 335 is arranged in the locking plug 333. After the locking plug 333 is connected, the containing part 335 is in communication with the internal space of the box 10 and is isolated from the outside. The iron powder of the oxygen-consuming material 311 is placed in the containing part 335, and can consume the oxygen inside the box 10 after the connecting part 33 is connected. Understandably, after the connecting part 33 is installed, the ventilation pipe 35 is set to a closed state.

[0163] In another aspect, an embodiment of the present application also provides a storage device 1, which comprises the battery device 100 provided by the above-mentioned embodiments.

[0164] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. These modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present 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 in that, include: A single battery cell, and multiple battery cells arranged to form an energy storage or release unit of the battery device; A housing for accommodating multiple battery cells; and A gas processing device is disposed on the housing and is used to process the gas inside the housing; wherein the gas processing device includes an oxygen reduction component, which is used to reduce the oxygen content inside the housing to a level lower than the oxygen content outside the housing.

2. The battery device according to claim 1, characterized in that, The housing includes a first cavity and a second cavity separated by space. The battery cell is configured to be housed in the first cavity, and the gas processing device is configured to communicate with the second cavity.

3. The battery device according to claim 2, characterized in that, The second cavity includes a first sub-cavity and a second sub-cavity. The first sub-cavity surrounds at least the bottom wall of the first cavity, and the second sub-cavity surrounds at least the side wall of the first cavity. The gas processing device is disposed on the outer side wall of the second sub-cavity.

4. The battery device according to claim 3, characterized in that, The battery cell includes a first pressure relief device, which is configured to face the first sub-chamber; and / or, the battery device includes a second pressure relief device, which is disposed on the outer wall of the second sub-chamber.

5. The battery device according to any one of claims 3 or 4, characterized in that, The battery device includes a thermal management component located between the battery cell and the first sub-chamber.

6. The battery device according to any one of claims 1-4, characterized in that, The gas processing device includes a receiving cavity that communicates with the internal space of the housing and is isolated from the external space of the housing. The oxygen reduction component is disposed within the receiving cavity.

7. The battery device according to any one of claims 1-4, characterized in that, The oxygen reduction component includes oxygen-consuming materials, which include oxygen absorbers based on inorganic matrix and / or oxygen absorbers based on organic matrix.

8. The battery device according to any one of claims 3 or 4, characterized in that, The gas processing device includes a connection portion that is detachably connected to the outer side wall.

9. The battery device according to any one of claims 3 or 4, characterized in that, The oxygen reduction component includes a polymer breathable membrane, which is configured such that the rate at which oxygen permeates through the membrane within the chamber is greater than the rate at which nitrogen permeates through the membrane within the chamber.

10. The battery device according to claim 9, characterized in that, The polymer breathable membrane includes polyimide membrane, polyurethane membrane, polycarbonate membrane, polytetrafluoroethylene membrane, silicone membrane, polyethylene membrane, polypropylene membrane, or composite membrane.

11. The battery device according to claim 9, characterized in that, The outer wall includes through holes, and the polymer breathable membrane is configured to cover the through holes.

12. The battery device according to claim 9, characterized in that, The gas treatment device also includes a reinforcing member, which is disposed around the polymer breathable membrane on the outer side wall and communicates with the external space of the box.

13. The battery device according to claim 9, characterized in that, The gas processing device further includes a ventilation pipe disposed on the outer wall and communicating with the second cavity, so that air can be injected into the second cavity.

14. The battery device according to claim 9, characterized in that, The oxygen-reducing component also includes an oxygen-consuming material. The gas treatment device includes a connecting portion detachably connected to the outer wall. The connecting portion is disposed on the outer side of the polymer breathable membrane, and the connecting portion includes a receiving portion, in which the oxygen-consuming material is disposed.

15. An energy storage device, characterized in that, Includes the battery device according to any one of claims 1-14.

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