Battery air replenishment device and battery protection system

Abstract

The present application provides a battery air replenishing device and a battery protection system, the battery air replenishing device includes a gas source, an inflation module, an exhaust module and a linkage module, the gas source is used to provide gas, the inflation module includes an inflation device and a first connecting pipe group, the inflation device is connected to the gas source and the battery cavity through the first connecting pipe group, the exhaust module includes an exhaust device and a second connecting pipe group, the exhaust device is connected to the battery cavity through the second connecting pipe group, the linkage module is connected to the inflation module and the exhaust module, the linkage module includes a linkage part and a control device, the linkage part has a first position and a second position, the linkage part can be moved between the first position and the second position, the control device is configured to be able to control the exhaust device and the inflation device to alternately connect with the battery cavity according to the position of the linkage part, so that the oxygen concentration in the battery cavity can be maintained at a low level, effectively reducing the risk of open flame and explosion during thermal runaway of the battery device.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery air replenishing device and a battery protection system. Background Art

[0002] Battery technology has been widely used in the fields of energy storage and power output. Related battery devices are widely used in power or energy storage equipment such as power battery systems and energy storage devices, which has effectively promoted the rapid development of new energy vehicles, power grid peak regulation and other industries.

[0003] During battery manufacturing, an inert gas is injected into the battery cavity. However, as the battery device is used, the concentration of the inert gas in the battery cavity gradually decreases, making it more likely to cause fire and explosion during thermal runaway. Summary of the Invention

[0004] In view of the above problems, the present application provides a battery air replenishment device and a battery protection system, which can maintain the oxygen concentration in the battery cavity at a low level, effectively reduce the risk of open flame and explosion during thermal runaway of the battery device, and improve the reliability of the battery device.

[0005] In the first aspect, the present application provides a battery air replenishing device, comprising a gas source, an inflation module, an exhaust module and a linkage module, the gas source is used to provide gas, the inflation module comprises an inflation device and a first connecting pipe group, the inflation device is connected to the gas source and the battery cavity through the first connecting pipe group, the exhaust module comprises an exhaust device and a second connecting pipe group, the exhaust device is connected to the battery cavity through the second connecting pipe group, the linkage module is connected to the inflation module and the exhaust module, the linkage module comprises a linkage part and a control device, the linkage part has a first position and a second position, the linkage part can move between the first position and the second position, and the control device is configured to control the exhaust device and the inflation device to alternately connect to the battery cavity according to the position of the linkage part.

[0006] In the embodiment of the present application, an additional linkage module is provided to connect with the inflation module and the exhaust module, so that the inflation device and the exhaust device can be alternately connected to the battery cavity, and a breathing air supply structure can be formed to coordinate the operation of the inflation module and the exhaust module, so that the oxygen concentration in the battery cavity is maintained at a low level, effectively reducing the risk of open flame and explosion during thermal runaway of the battery device.

[0007] In some embodiments, the inflation device has a first cavity with a variable volume, and the exhaust device has a second cavity with a variable volume. The linkage is connected to the inflation device and the exhaust device, and can drive the volume of the first cavity and the second cavity to increase or decrease synchronously. Only one power source is required to achieve coordinated action between the inflation module, the exhaust module and the linkage module, thereby improving synchronization and the stability of battery air replenishment.

[0008] In some embodiments, the inflation device includes a first cylinder and a first piston movably connected to the first cylinder, the first piston and the first cylinder enclosing a first cavity. The exhaust module includes a second cylinder and a second piston movably connected to the second cylinder, the second piston and the second cylinder enclosing a second cavity. A linkage is connected to the first piston and the second piston to achieve coordinated action between the inflation module, the exhaust module, and the linkage module, thereby improving synchronization and stability of battery air replenishment.

[0009] In some embodiments, the first connecting tube group includes a first pipeline and a first switch arranged on the first pipeline. The first pipeline is connected between the first cavity and the gas source. The control device is configured to control the vacuum device to be connected to the battery cavity and control the first switch to be closed when the linkage is in the first position, so as to push the linkage from the first position to the second position through the gas source.

[0010] In the embodiment of the present application, by utilizing the pressure difference between the gas source and the atmosphere for driving, the power requirement for the drive motor can be reduced, and the device can be suitable for use in harsh working conditions such as outdoor use of energy storage containers, thereby improving the applicability of the battery air replenishment device.

[0011] In some embodiments, the control device is further configured to control the first switch to be disconnected when the linkage member is in the second position, and the linkage module further includes an elastic member connected to the linkage member, and when the linkage member is in the second position, the elastic member is in an elastic deformation state.

[0012] In the embodiment of the present application, by driving the battery air replenishment device by the pressure difference between the air source and the atmosphere and utilizing the elastic restoring force of the elastic member to reset, the driving motor for driving the linkage member to move can be eliminated, that is, the electric drive is eliminated, thereby being more suitable for battery air replenishment of energy storage containers in relatively harsh operating environments, thereby improving applicability.

[0013] In some embodiments, the first connecting pipe group also includes a first one-way valve arranged in the first pipeline, the inlet end of the first one-way valve is connected to the gas source, and the outlet end of the first one-way valve is connected to the first cavity, so that the inert gas can only flow one-way from the gas source to the first cavity of the inflation device, thereby protecting the gas source equipment, reducing pressure fluctuations, and improving the efficiency of the battery gas replenishment device.

[0014] In some embodiments, the first connecting tube group includes a second tube connected to the inflation device, the second connecting tube group includes a third tube connected to the exhaust device, and the ends of the second tube and the third tube intersect to form a battery interface for connecting to the battery cavity.

[0015] In the embodiment of the present application, since the exhaust device and the inflation device inside the battery air replenishing device are alternately connected to the battery cavity, the ends of the second pipeline and the third pipeline can be intersected and formed to form a common battery interface, so that it can be compatible with a battery device with only one air hole, thereby improving the applicability of the battery air replenishing device.

[0016] In some embodiments, the first connecting tube group further includes a second switch provided in the second pipeline, and the second connecting tube group further includes a third switch provided in the third pipeline. The control device is configured to control the second switch to be disconnected and the third switch to be closed when the linkage is in the first position, and to control the second switch to be closed and the third switch to be disconnected when the linkage is in the second position, so as to realize that the vacuum device and the inflation device of the battery air replenishing device are alternately connected to the battery cavity.

[0017] In some embodiments, the second connecting pipe group also includes a fourth pipeline and a second one-way valve arranged on the fourth pipeline. The fourth pipeline is used to connect the air extraction device to the external environment. The inlet end of the second one-way valve is connected to the air extraction device, and the outlet end of the second one-way valve is connected to the external environment. Therefore, when the battery device is in the air extraction state, the gas in the external environment will not enter the second cavity through the fourth pipeline, thereby improving the air extraction efficiency of the battery air replenishing device.

[0018] In some embodiments, the battery air replenishing device also includes an induction switch, which is respectively set at a first position and a second position. The control device is connected to the induction switch, so that when the linkage moves to the first position and the second position, the induction switch can be triggered and output a signal to the control device to realize the switching of the battery air replenishing device between the exhaust state and the inflation state.

[0019] In some embodiments, the linkage member includes a shading portion, and the induction switch includes a light source and a light sensing element that are relatively arranged. When the linkage member is in the first position and the second position, the movement path of the linkage member is between the light source and the light sensing element, and the shading portion can block the light emitted by the light source to the light sensing element, so that the induction switch can be triggered and output a signal to the control device, thereby realizing the switching of the battery air replenishing device between the exhaust state and the inflation state.

[0020] In some embodiments, the battery air replenishing device further includes a detection module, which is connected to the induction switch and is configured to detect the number of times the linkage member passes through the first position and / or the second position, and can record the number of times the battery air replenishing device replenishes air into the battery cavity, thereby achieving quantitative control of the air replenishment into the battery cavity.

[0021] In a second aspect, the present application provides a battery protection system, comprising the battery air replenishing device as described in the above embodiment.

[0022] In some embodiments, the battery protection system is used for an energy storage device, which includes multiple battery devices. The battery protection system also includes a transfer pipe group, which includes a main line and multiple branch lines. The main line is connected to the battery air supply device, and one end of the multiple branch lines is connected to the main line, and the other end is respectively connected to one of the battery devices. The same battery air supply device can be used to simultaneously supply air to multiple battery devices, thereby improving the air supply efficiency of the battery protection system.

[0023] In some embodiments, the main line is provided with a main line switch, which can be used to control the on-off connection between the battery air replenishment device and the main line, and / or, at least some of the branch lines are provided with branch line switches, which can be used to control the on-off connection between the main line and the branch lines, thereby realizing independent control of some battery devices and improving the reliability of the battery protection system.

[0024] In some embodiments, at least two branch pipelines converge to form a confluence pipeline, the branch pipelines are connected to the main pipeline through the confluence pipeline, and the branch switch is provided on the confluence pipeline.

[0025] In this embodiment of the present application, since multiple battery units in an energy storage container can be combined to form a battery cluster, when at least two branch pipes converge to form a busbar, each busbar can be configured to correspond to a single battery cluster. By installing branch switches in the busbar, inert gas can be replenished individually for each battery cluster, improving the reliability of the battery protection system.

[0026] In some embodiments, the battery protection system also includes a monitoring device, a control box, and a transport device. The monitoring device is used to detect the operating status information of the battery device. The control box is configured to control the transport device to transport the battery device to a predetermined area when the operating status information is abnormal, thereby reducing the impact of abnormal operating status information of any battery device on other battery devices.

[0027] In some embodiments, the battery protection system further includes a cooling container for storing a fire extinguishing medium. The control box is further configured to control the transport device to immerse the battery device in the fire extinguishing medium when an abnormality occurs in the operating status information of the battery device.

[0028] In the embodiment of the present application, by providing a cooling container storing a fire extinguishing medium, after the fire risk of the battery device is confirmed, the fire triangle fire extinguishing principle can be combined, and the battery device can be moved out of the energy storage container by a transport device and immersed in the fire extinguishing medium, so that immersion cooling can be performed, effectively reducing the temperature and cutting off the chain reaction of thermal runaway to achieve fire extinguishing without re-ignition, effectively reducing the risk of fire spread.

[0029] According to an embodiment of the present application, a battery gas supply device includes a gas source, an inflation module, an exhaust module, and a linkage module. The battery gas supply device has an exhaust state and an inflation state. The linkage is configured to move between a first position and a second position. The control device is configured to control the switching of the battery gas supply device between the exhaust state and the inflation state according to the position of the linkage. In the exhaust state, the control device can be configured to disconnect the inflation device from the battery cavity and connect the exhaust device to the battery cavity, thereby extracting the gas in the battery cavity and creating conditions for injecting inert gas. In the inflation state, the control device can be configured to disconnect the exhaust device from the battery cavity and connect the inflation device to the battery cavity, so that the gas provided by the gas source enters the battery cavity through the inflation device. By alternately connecting the exhaust device and the inflation device to the battery cavity, a breathing gas supply structure can be formed to coordinate the operation of the exhaust module and the inflation module, control the internal pressure of the battery, and maintain the oxygen concentration in the battery cavity at a low level, effectively reducing the risk of open fire and explosion during thermal runaway of the battery device and improving the reliability of the battery device.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0032] Figure 1 is a schematic structural diagram of an energy storage device provided in some embodiments of the present application;

[0033] Figure 2 is a schematic structural diagram of a battery air replenishing device provided in some embodiments of the present application;

[0034] Figure 3 This is a connection diagram of a battery air replenishing device provided in some embodiments of the present application;

[0035] Figure 4 This is an operational logic diagram of a battery air replenishing device provided in some embodiments of the present application;

[0036] Figure 5 It is a structural diagram of a battery protection system provided in some embodiments of the present application.

[0037] In the attached figure:

[0038] 100 battery protection system, 200 energy storage device, 210 battery device, 220 control box;

[0039] 10. Battery refill device;

[0040] 1. Air source, 2. Inflatable module, 21. Inflatable device, 211. First cylinder, 212. First piston, 22. First switch, 23. First one-way valve, 24. Second switch, 3. Exhaust module, 31. Exhaust device, 311. Second cylinder, 312. Second piston, 32. Third switch, 33. Second one-way valve, 4. Linkage module, 41. Linkage member, 411. Light shielding portion, 42. Elastic member, 43. Control device, 431. Programmable logic controller, 432. Digital signal processor, 5. Inductive switch, 51. Light source, 52. Light sensing element, 53. First circuit switch, 54. Second circuit switch, 6. Transfer pipe assembly, 61. Main line, 611. Main line switch, 62. Branch line, 621. Branch switch, 7. Transport device, 8. Cooling container, 9. Power supply;

[0041] X is the first direction, Y is the second direction. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0043] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0045] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0046] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0047] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] Currently, judging by market developments, energy storage devices are becoming increasingly widely used. An energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When an energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device. Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it at the appropriate time. For example, an energy storage device can store electrical energy during low-consumption periods and provide electrical energy to relevant users or electrical equipment during peak periods.

[0049] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0050] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described power consumption devices, energy storage devices, etc. For the sake of simplicity, the following embodiments are described using energy storage containers as an example.

[0051] For example, Figure 1 As shown, the energy storage container can include a control box 220 and a battery cluster. The battery cluster can include at least one battery unit 210, and optionally can include two or more battery units 210. The included control box 220 can be connected to the battery cluster and can optionally be used to control and manage the operation of the energy storage container. For example, the control box 220 can monitor parameters such as the battery cluster's voltage, current, and temperature, and control the charging and discharging processes of the battery units 210 according to preset strategies and external commands to ensure safe and efficient operation of the battery cluster. Furthermore, the control box 220 can communicate with external systems to enable remote monitoring and scheduling.

[0052] The battery device 210 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0053] In the embodiments of the present application, the battery cells may be secondary battery cells. A secondary battery cell refers to a battery cell that can be recharged to activate the active material after discharge and continue to be used. Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, and lead-acid batteries.

[0054] In some embodiments, the battery device 210 can be a battery pack, which includes a case and one or more battery cell assemblies. The battery case has a battery cavity, and the battery cell assembly is accommodated in the battery cavity for encapsulating one or more battery cells to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0055] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the battery cavity by fixing the battery module in a box. As an example, the battery cell assembly may also be accommodated in the battery cavity by directly fixing multiple battery cells to the box.

[0056] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-mentioned energy storage containers, but can also be applied to other energy storage devices 200 or electrical devices such as vehicles.

[0057] For the battery device 210, the main gas generated by thermal runaway of the battery device 210 is hydrogen. According to the "GB6222-2005 Industrial Enterprise Gas Safety Regulations", when the oxygen concentration in the battery cavity is less than a certain value, there is no risk of combustion or explosion. At the same time, relevant experimental results also show that because some batteries (such as lithium metal batteries) use highly active lithium metal, they may react violently when in contact with oxygen or moisture in the air. Therefore, the thermal runaway of the battery device 210 under air conditions is more severe than under inert gas conditions.

[0058] Therefore, during the manufacture of battery device 210, an inert gas is injected into the battery cavity to reduce the oxygen concentration within the battery cavity, keeping it below the flammability limits of the electrolyte or lithium metal. Furthermore, the low electrical conductivity of inert gases (especially high-purity nitrogen) can reduce the generation and accumulation of static electricity. An inert gas environment can also reduce the energy transmission efficiency of sparks. Even if a discharge occurs, it is unlikely to ignite surrounding flammable gases, effectively reducing the risk of thermal runaway combustion and explosion.

[0059] However, although the battery device 210 is generally designed as a sealed structure, the sealing performance of the battery may gradually deteriorate during long-term use due to material aging, mechanical stress, or manufacturing process defects. This can cause the inert gas inside the battery cavity to diffuse to the outside, resulting in a gradual decrease in the inert gas content and an increased risk of thermal runaway of the battery device 210.

[0060] To overcome the above-mentioned problems, the present application further provides a battery air supply device 10 and a battery protection system 100. By connecting to a battery device 210, the battery device 210 can be air-supplemented to maintain a low oxygen concentration within the battery cavity, thereby reducing the risk of fire and explosion during thermal runaway of the battery device 210. The battery air supply device 10 and the battery protection system 100 according to an embodiment of the present application are described below with reference to the accompanying drawings.

[0061] See also Figures 1 to 3 , Figure 2 Schematic diagram of the structure of the battery air replenishing device 10 provided in some embodiments of the present application is shown. Figure 3 A connection diagram of a battery air replenishing device 10 provided in some embodiments of the present application is shown.

[0062] An embodiment of the present application provides a battery air replenishing device 10 , comprising an air source 1 , an air charging module 2 , and an air extraction module 3 .

[0063] Gas source 1 is used to provide gas, which can be an inert gas, such as nitrogen. Inert gas is not necessarily inert, but rather exhibits high chemical stability under specific conditions. For example, if nitrogen is the inert gas provided, gas source 1 can be a nitrogen storage tank, or a liquid nitrogen storage tank and a vaporizer. The liquid nitrogen is stored in the liquid nitrogen storage tank and then vaporized into gaseous nitrogen by the vaporizer when needed.

[0064] The inflation module 2 includes an inflation device 21 and a first connecting pipe group. The inflation device 21 is connected to the gas source 1 and the battery cavity through the first connecting pipe group.

[0065] The first connecting tube group is the connecting channel between the inflation device 21 and the gas source 1 and the battery cavity. The inflation device 21 is a device for injecting the inert gas provided by the gas source 1 into the battery cavity. It can stabilize the pressure fluctuation of the gas source 1 and enable the inert gas to be stably injected into the battery cavity through the first connecting tube group to meet the demand of reducing the oxygen concentration in the battery cavity.

[0066] The exhaust module 3 includes an exhaust device 31 and a second connecting pipe assembly, which connects the exhaust device 31 to the battery cavity. The second connecting pipe assembly is a connecting channel between the exhaust device 31 and the battery cavity, and the exhaust device 31 is used to extract some of the gas in the battery cavity.

[0067] Since when the inert gas is added to the battery cavity through the inflation device 21, while the concentration of the inert gas in the battery cavity is increased, the pressure in the battery device 210 will also be greatly increased. Therefore, by setting the inflation module 2 and the exhaust module 3 at the same time, the pressure in the battery device 210 can be reduced by the exhaust device 31, and the risk of deformation or structural damage to the battery device 210 is reduced. At the same time, when the concentration of the inert gas in the battery cavity has reached a certain value, it is very difficult or impossible to mix inert gas into the battery cavity to increase the concentration of the inert gas. Therefore, by setting the exhaust module 3, a part of the original gas in the battery cavity can be extracted before inflation, and then when the inert gas is injected, it can be more convenient to improve the efficiency of increasing the concentration of the inert gas.

[0068] Among them, for the inflation module 2 and the exhaust module 3, it is necessary to coordinate the operations of the inflation module 2 and the exhaust module 3 to improve the replenishment efficiency of the inert gas concentration in the battery cavity and the reliability of the gas replenishment process.

[0069] In this regard, the battery air replenishing device 10 in the embodiment of the present application also includes a linkage module 4, which is connected to the inflation module 2 and the exhaust module 3. The linkage module 4 includes a linkage member 41 and a control device 43. The linkage member 41 has a first position and a second position. The linkage member 41 can move between the first position and the second position. The control device 43 is configured to control the exhaust device 31 and the inflation device 21 to alternately connect with the battery cavity according to the position of the linkage member 41.

[0070] The battery air replenishing device 10 in the embodiment of the present application is additionally provided with a linkage module 4 to connect with the inflation module 2 and the exhaust module 3. The battery air replenishing device 10 has an exhaust state and an inflation state. The linkage member 41 is configured to be movable between a first position and a second position. The control device 43 is configured to control the switching of the battery air replenishing device 10 between the exhaust state and the inflation state according to the position of the linkage member 41. In the exhaust state, the control device 43 can be configured to disconnect the inflation device 21 from the battery cavity and connect the exhaust device 31 to the battery cavity, thereby extracting the gas in the battery cavity and creating conditions for injecting inert gas. In the inflation state, the control device 43 can be configured to disconnect the exhaust device 31 from the battery cavity and connect the inflation device 21 to the battery cavity, and the gas provided by the gas source 1 enters the battery cavity through the inflation device 21. By alternately connecting the inflation device 21 and the exhaust device 31 to the battery cavity, a breathing air supply structure can be formed to coordinate the operation of the inflation module 2 and the exhaust module 3, control the internal pressure of the battery, and maintain the oxygen concentration in the battery cavity at a low level, effectively reducing the risk of open flame and explosion during thermal runaway of the battery device 210, and improving the reliability of the battery device 210.

[0071] It will be appreciated that the battery air replenishment device 10 in the embodiment of the present application, through the reciprocating movement of the linkage 41, controls the alternating linkage of the air extraction device 31 and the air filling device 21 with the battery cavity, enabling automated control. Furthermore, the movement of the linkage 41 to a specific position triggers air path switching, ensuring a strict alternation between the air extraction and air filling states. By adjusting the movement speed and stroke of the linkage 41, the duration of each state can be precisely controlled to accommodate the air replenishment requirements of different battery devices 210.

[0072] See also Figures 1 to 3 In some optional embodiments, the inflation device 21 has a first cavity with a variable volume, the exhaust device 31 has a second cavity with a variable volume, and the linkage 41 is connected to the inflation device 21 and the exhaust device 31, and can drive the volume of the first cavity and the second cavity to increase or decrease synchronously.

[0073] The inflatable device 21 can be configured as a piston-type inflatable device, a bellows-type inflatable device, etc. The inflatable device 21 has a first cavity with a variable volume, which can be understood as allowing the inflatable device 21 to dynamically adjust the volume of the first cavity through mechanical, fluidic, or other means, thereby changing the amount of gas that can be accommodated within the inflatable device 21.

[0074] The air extraction device 31 may also be configured as a piston-type air extraction device, a bellows-type air extraction device, etc. The air extraction device 31 having a second cavity with a variable volume can be understood as the air extraction device 31 being able to dynamically adjust the volume of the second cavity through mechanical, fluidic, or other means, thereby changing the amount of gas that can be accommodated within the air extraction device 31.

[0075] Since, when the battery air replenishing device 10 is in the exhausting state, the inflating device 21 is disconnected from the battery cavity, and the exhaust device 31 is connected to the battery cavity, for the inflating device 21, the gas provided by the gas source 1 is injected into the first cavity, increasing the volume of the first cavity, and for the exhaust device 31, the gas in the battery cavity is also injected into the second cavity, increasing the volume of the second cavity. Since, when the battery air replenishing device 10 is in the inflating state, the inflating device 21 is connected to the battery cavity, and the exhaust device 31 is disconnected from the battery cavity, for the inflating device 21, the gas in the first cavity is injected into the battery cavity, decreasing the volume of the first cavity, and for the exhaust device 31, the gas in the second cavity is discharged into the external environment, decreasing the volume of the second cavity.

[0076] By setting a linkage 41 connected to the first cavity and the second cavity, when the battery air replenishing device 10 is in the exhaust state, the linkage 41 can drive the volume of the first cavity and the second cavity to increase synchronously. When the battery air replenishing device 10 is in the inflation state, the linkage 41 can drive the volume of the first cavity and the second cavity to decrease synchronously. Only one power source is required to achieve the coordinated action between the inflation module 2, the air exhaust module 3 and the linkage module 4, while achieving reliable switching of the battery air replenishing device 10 between the exhaust state and the inflation state, and improving the synchronization and stability of the battery air replenishment.

[0077] As an optional implementation, the inflation device 21 is a piston-type inflation device, and the exhaust device 31 is a piston-type exhaust device.

[0078] Specifically, the inflation device 21 includes a first cylinder 211 and a first piston 212 movably connected to the first cylinder 211. The first piston 212 and the first cylinder 211 enclose a first cavity. The air extraction module 3 includes a second cylinder 311 and a second piston 312 movably connected to the second cylinder 311. The second piston 312 and the second cylinder 311 enclose a second cavity. The linkage 41 is connected to the first piston 212 and the second piston 312.

[0079] In the battery air replenishment device 10 of the embodiment of the present application, when the air filling device 21 is a piston-type air filling device and the air extraction device 31 is a piston-type air extraction device, the first piston 212 reciprocates in the first cylinder 211 to change the volume of the first cavity in the air filling device 21, and the second piston 312 reciprocates in the second cylinder 311 to change the volume of the second cavity in the air extraction device 31. The linkage 41 is connected to the first cavity and the second cavity. It can be understood that the linkage 41 is connected to the first piston 212 of the air filling device 21 and the second piston 312 of the air extraction device 31. Therefore, when the linkage 41 moves between the first position and the second position, it can drive the volume of the first cavity and the second cavity to increase or decrease synchronously. Only one power source is required to achieve the coordinated action between the air filling module 2, the air extraction module 3 and the linkage module 4, thereby improving the synchronization and stability of the battery air replenishment.

[0080] Optionally, the first piston 212 of the inflation device 21 is movably connected to the first cylinder 211 along the first direction X, and the second piston 312 of the exhaust device 31 is movably connected to the second cylinder 311 along the first direction X. The first position and the second position are arranged at intervals in the first direction X. The linkage 41 can reciprocate between the first position and the second position along the first direction X, and can drive the first piston 212 and the second piston 312 to move synchronously along the first direction X, so that the volumes of the first cavity and the second cavity increase or decrease synchronously.

[0081] By arranging the inflation device 21 and the exhaust device 31 side by side and moving the linkage 41 along the first direction X, the first piston 212 of the inflation device 21 and the second piston 312 of the exhaust device 31 are synchronously driven to move along the first direction X, thereby achieving a synchronous increase or decrease in the volume of the first cavity and the second cavity. The structure is simple and reliable, and can make the layout of the battery air replenishing device 10 more compact and improve movement synchronization.

[0082] It can be understood that when the linkage 41 is connected to the inflation device 21 and the vacuum device 31, as an optional embodiment, the power source can be set to a drive motor, which drives the linkage 41 to move along the first direction X through the drive motor, thereby driving the first piston 212 and the second piston 312 connected to the linkage 41 to move, thereby realizing a synchronous increase or decrease in the volume of the first cavity and the second cavity.

[0083] As another optional embodiment, the first connecting pipe group includes a first pipeline and a first switch 22 arranged on the first pipeline, the first pipeline is connected between the first cavity and the gas source 1, and the control device 43 is configured to control the exhaust device 31 to be connected to the battery cavity and control the first switch 22 to be closed when the linkage 41 is in the first position, so as to push the linkage 41 from the first position to the second position through the gas source 1.

[0084] The first switch 22 can be specifically configured as an electric shut-off valve, such as a ball valve, a gate valve, or a stop valve.

[0085] When the linkage 41 is in the first position, the control device 43 is configured to switch the battery air replenishment device 10 to a vacuum state. In the vacuum state, the vacuum device 31 is connected to the battery cavity, and the inflation device 21 is disconnected from the battery cavity. At this time, by controlling the control device 43 to close the first switch 22, that is, when the inert gas is injected into the first cavity via the gas source 1, the pressure difference between the gas source 1 and the atmosphere is used as a driving force to push the first piston 212 to move in the first direction X, thereby driving the linkage 41 and the second piston 312 to move in the first direction X, thereby achieving vacuuming of the vacuum device 31.

[0086] The battery air replenishing device 10 in the embodiment of the present application is driven by utilizing the pressure difference between the gas source 1 and the atmosphere. Compared with the method of driving the linkage 41 by a driving motor, it can reduce the power requirement of the driving motor, and can be suitable for use scenarios of energy storage containers in harsh working conditions such as outdoor conditions, thereby improving the applicability of the battery air replenishing device 10.

[0087] See also Figures 1 to 3 In some optional embodiments, the control device 43 is further configured to control the first switch 22 to be disconnected when the linkage member 41 is in the second position. The battery air replenishing device 10 also includes an elastic member 42, which is connected to the linkage member 41, and when the linkage member 41 is in the second position, the elastic member 42 is in an elastic deformation state.

[0088] By having the battery air replenishment device 10 also include an elastic member 42, when the linkage member 41 moves to the second position driven by the pressure difference between the gas source 1 and the atmosphere, the control device 43 is configured to switch the battery air replenishment device 10 to the air replenishment state. In the air replenishment state, the air replenishment device is connected to the battery cavity, and the air extraction device 31 is disconnected from the battery cavity. At this time, by having the control device 43 control the first switch 22 to be disconnected, the linkage member 41 can move in the opposite direction of the first direction X under the action of the elastic restoring force of the elastic member 42, and drive the first piston 212 and the second piston 312 to move in the opposite direction of the first direction X, thereby achieving inflation of the air replenishment device 21 and exhaust of the gas in the air extraction device 31.

[0089] Optionally, when the linkage member 41 is in the first position, the elastic member 42 is at its original length, allowing the linkage member 41 to move from the second position to the first position under the elastic restoring force of the elastic member 42. When the linkage member 41 is in the first position, the control device 43 can again control the air extraction device 31 to communicate with the battery cavity and close the first switch 22, switching the battery air supply device 10 back to the air supply state. By repeating this process, the battery air supply device 10 can alternately be operated to extract and fill air until the oxygen concentration in the battery cavity is reduced to a preset range.

[0090] Optionally, the elastic member 42 may be configured as at least one of a spring, a spring sheet, an elastic bellows, and the like.

[0091] It can be understood that the present application enables the battery air replenishment device 10 to be driven by the pressure difference between the gas source 1 and the atmosphere, and utilizes the elastic restoring force of the elastic member 42 to reset, thereby eliminating the drive motor for driving the linkage member 41 to move, that is, canceling the electric drive, thereby being more suitable for battery air replenishment of energy storage containers in relatively harsh operating environments, thereby improving applicability.

[0092] In some optional embodiments, the first connecting pipe group further includes a first one-way valve 23 provided in the first pipeline, the inlet end of the first one-way valve 23 is connected to the gas source 1, and the outlet end of the first one-way valve 23 is connected to the first cavity.

[0093] The inlet and outlet of the first one-way valve 23 are ports that distinguish the direction of airflow, ensuring that the inert gas can only flow in one direction, from the inlet to the outlet. When the first pipeline is further provided with a first one-way valve 23, the first one-way valve 23 is located between the inflation device 21 and the gas source 1. By connecting the inlet of the first one-way valve 23 to the gas source 1 and the outlet to the first cavity, the inert gas can only flow in one direction, from the gas source 1, into the first cavity of the inflation device 21. This protects the gas source 1 equipment, reduces pressure fluctuations, and improves the efficiency of the battery gas replenishment device 10.

[0094] In some optional embodiments, the first connecting tube group includes a second tube connected to the inflation device 21, and the second connecting tube group includes a third tube connected to the vacuum device 31. The ends of the second tube and the third tube intersect to form a battery interface for connecting to the battery cavity.

[0095] For the battery air replenishing device 10 in the embodiment of the present application, since the internal exhaust device 31 and the inflation device 21 are alternately connected to the battery cavity, when the inflation device 21 is connected to the battery cavity through the second pipeline and the exhaust device 31 is connected to the battery cavity through the third pipeline, the ends of the second pipeline and the third pipeline can be intersected and formed to form a common battery interface, thereby being compatible with the battery device 210 with only one air hole, thereby improving the applicability of the battery air replenishing device 10.

[0096] Of course, in other embodiments, when the battery air replenishment device 10 is applied to a battery device 210 having multiple air holes, the ends of the second and third pipes can also be independently provided, with the end of the second pipe forming a first battery interface connected to the battery cavity, and the end of the third pipe forming a second battery interface connected to the battery cavity. By independently providing the ends of the second and third pipes, the passages formed by the air extraction device 31 and the air filling device 21 and the battery cavity can be disconnected from each other, and the inert gas to be injected into the second pipe and the gas extracted from the battery cavity into the third pipe will not mix with each other, thereby improving the air replenishment efficiency.

[0097] In some optional embodiments, the first connecting tube group further includes a second switch 24 provided in the second pipeline, and the second connecting tube group further includes a third switch 32 provided in the third pipeline. The control device 43 is configured to control the second switch 24 to be disconnected and the third switch 32 to be closed when the linkage 41 is in the first position, and to control the second switch 24 to be closed and the third switch 32 to be disconnected when the linkage 41 is in the second position.

[0098] When the linkage member 41 is in the first position, the control device 43 controls the second switch 24 to open and the third switch 32 to close, thereby disconnecting the inflator 21 from the battery cavity and connecting the air extraction device 31 to the battery cavity, thereby switching the battery air filling device 10 to the air extraction state. When the linkage member 41 is in the second position, the control device 43 controls the second switch 24 to close and the third switch 32 to open, thereby connecting the inflator 21 to the battery cavity and disconnecting the air extraction device 31 from the battery cavity, thereby switching the battery air filling device 10 to the air filling state, thereby achieving alternating connection between the air extraction device 31 and the inflator 21 of the battery air filling device 10 and the battery cavity.

[0099] Compared with setting a switch at the intersection of the second pipeline and the third pipeline, by setting switches on the second pipeline and the third pipeline respectively, independent control of the second pipeline and the third pipeline can be achieved. By controlling the alternating closure of the second switch 24 and the third switch 32, the exhaust device 31 and the inflation device 21 can be alternately connected to the battery cavity simply and reliably, thereby improving the accuracy of control and improving system reliability.

[0100] Optionally, the second switch 24 and / or the third switch 32 may be specifically configured as an electric shutoff valve, such as a ball valve, a gate valve, or a stop valve.

[0101] See also Figures 1 to 3 In some optional embodiments, the second connecting pipe group also includes a fourth pipeline and a second one-way valve 33 arranged on the fourth pipeline. The fourth pipeline is used to connect the air extraction device 31 with the external environment. The inlet end of the second one-way valve 33 is connected to the air extraction device 31, and the outlet end of the second one-way valve 33 is connected to the external environment.

[0102] A second one-way valve 33 is provided on the fourth conduit connecting the gas extraction device 31 to the external environment, and is located between the gas extraction device 31 and the external environment. By connecting the inlet end of the second one-way valve 33 to the gas extraction device 31 and the outlet end of the second one-way valve 33 to the external environment, the gas extracted from the battery cavity by the gas extraction device 31 can flow only from the second cavity to the external environment. Therefore, when the battery device 210 is in the gas extraction state, gas from the external environment cannot enter the second cavity through the fourth conduit, thereby improving the gas extraction efficiency of the battery gas replenishing device 10.

[0103] Of course, in some other embodiments, the fourth pipeline can also be set as a fourth switch, and the control device 43 is configured to control the fourth switch to be opened when the linkage 41 is in the first position, and to control the fourth switch to be closed when the linkage 41 is in the second position.

[0104] In order to enable the control device 43 to control the exhaust device 31 and the inflation device 21 to alternately connect with the battery cavity according to the position of the linkage 41, in some optional embodiments, the battery air replenishing device 10 also includes an induction switch 5, which is respectively set at a first position and a second position, and the control device 43 is connected to the induction switch 5.

[0105] By respectively arranging the induction switch 5 at the first position and the second position, when the linkage member 41 moves to the first position, the induction switch 5 at the first position can be triggered and output a signal to the control device 43; when the linkage member 41 moves to the second position, the induction switch 5 at the second position can be triggered and output a signal to the control device 43, thereby realizing the switching of the battery air replenishing device 10 between the exhaust state and the inflation state.

[0106] Optionally, the induction switch 5 may be a photoelectric induction switch, a proximity induction switch, or the like.

[0107] As an optional implementation, taking the sensing switch 5 as a photoelectric sensing switch as an example, the linkage part 41 includes a shading portion 411, and the sensing switch 5 includes a light source 51 and a light sensing element 52 arranged relatively to each other. When the linkage part 41 is located in the first position and the second position, the moving path of the linkage part 41 is located between the light source 51 and the light sensing element 52, and the light emitted by the light source 51 to the light sensing element 52 can be blocked by the shading portion 411.

[0108] When the linkage member 41 is movably disposed along the first direction X, the light source 51 and the light sensing element 52 of the sensor switch 5 can be disposed relatively to each other along the second direction Y, where the second direction Y intersects the first direction X. The movement path of the linkage member 41 being located between the light source 51 and the light sensing element 52 can be understood as the movement path of the linkage member 41 being located between the light source 51 and the light sensing element 52 along the second direction Y.

[0109] When the light shielding portion 411 moves along the first direction X to a first position, the light shielding portion 411 is aligned with the light source 51 and the light sensing element 52. Light emitted by the light source 51 at the first position is blocked by the light shielding portion 411. The light sensing element 52 at the first position can output a signal to the control device 43, switching the battery air replenishing device 10 to the exhaust state. Similarly, when the light shielding portion 411 moves along the first direction X to a second position, the light shielding portion 411 is aligned with the light source 51 and the light sensing element 52. Light emitted by the light source 51 at the second position is blocked by the light shielding portion 411. The light sensing element 52 at the second position can output a signal to the control device 43, switching the battery air replenishing device 10 to the inflation state.

[0110] Optionally, the light source 51 may be configured as a laser light source, and the light shielding portion 411 may be configured as a laser light shielding plate.

[0111] Optionally, the control device 43 includes a programmable logic controller 431 and a digital signal processor 432. When the shading portion 411 blocks the light emitted by the light source 51, the light sensing element 52 transmits a signal to the digital signal processor 432, and the signal processed by the digital signal processor 432 is transmitted to the programmable logic controller 431, thereby controlling the opening or closing of the first switch 22, the second switch 24 and the third switch 32 through the programmable logic controller 431.

[0112] Optionally, the battery air replenishment device 10 further includes a power source 9, and the light-sensing switch may further integrate a first circuit for controlling the on / off switching of the light source 51. The first circuit includes a first circuit switch 53. When air replenishment to the battery cavity is not required, the first circuit switch 53 is controlled to be disconnected, turning off the light source 51 to save energy. When air replenishment to the battery cavity is required, the first circuit switch 53 is controlled to be closed, turning on the light source 51, thereby cooperating with the light-sensing element 52 to switch the state of the battery air replenishment device 10.

[0113] Optionally, the photosensitive switch may also be integrated with a second circuit for controlling the opening or closing of the photosensitive element 52. The second circuit is provided with a second circuit switch 54, so that the second circuit switch 54 can be controlled to be disconnected when there is no need to replenish the battery cavity with air, and the second circuit switch 54 can be controlled to be closed only when there is a need to replenish the battery cavity with air, so as to save electric energy.

[0114] The battery air replenishing device 10 in the embodiment of the present application can replenish the battery cavity of the battery device 210 with a fixed amount of inert gas at preset intervals during use of the battery device 210, thereby maintaining the battery device 210. Since multiple replenishments may be required to reduce the oxygen concentration in the battery cavity below a preset value, the battery air replenishing device 10 can be used to control the number of replenishments performed each time the inert gas is replenished, thereby quantitatively replenishing the inert gas into the battery cavity and achieving a flame retardant effect.

[0115] See also Figures 1 to 4 , Figure 4 An operational logic diagram of a battery air replenishing device 10 provided in some embodiments of the present application is shown.

[0116] In some optional embodiments, the battery air replenishing device 10 further includes a detection module, which is connected to the induction switch 5 and is configured to detect the number of times the linkage member 41 passes through the first position and / or the second position.

[0117] By providing a detection module and detecting the number of times the linkage member 41 passes through the first position and / or the second position through the detection module, the number of times the battery air replenishing device 10 replenishes air into the battery cavity can be recorded, thereby achieving quantitative control of the air replenishment into the battery cavity.

[0118] As an optional embodiment, when replenishing the inert gas into the battery cavity at preset intervals, a preset number of gas replenishment times into the battery cavity can be set by the control device 43. Each time the linkage member 41 passes through the first position or the second position, the actual gas replenishment times recorded by the detection module increase accordingly. When the actual gas replenishment times recorded by the detection module reaches the preset gas replenishment times into the battery cavity, the battery gas replenishment device 10 can be controlled to stop replenishing gas into the battery cavity, thereby achieving a flame retardant effect.

[0119] Optionally, the control device 43 may further include a control panel, so as to set a preset number of air replenishment times into the battery cavity through the control panel, thereby realizing automatic control of the battery air replenishment device 10 .

[0120] See also Figures 1 to 4As an optional implementation, the battery air replenishing device 10 in the embodiment of the present application includes a gas source 1, an air charging module 2, an air extraction module 3, a linkage module 4 and an induction switch 5.

[0121] The gas source 1 is used to provide an inert gas, such as nitrogen.

[0122] The inflation module 2 includes an inflation device 21 and a first connecting pipe assembly. The inflation device 21 includes a first cylinder 211 and a first piston 212 movably connected to the first cylinder 211. The first piston 212 and the first cylinder 211 enclose a first cavity. The first connecting pipe assembly includes a first pipeline and a second pipeline. The first pipeline is connected between the first cavity and the gas source 1. The first pipeline is provided with a first switch 22 and a first one-way valve 23. The inlet end of the first one-way valve 23 is connected to the gas source 1, and the outlet end of the first one-way valve 23 is connected to the first cavity. The second pipeline is connected between the first cavity and the battery cavity and is provided with a second switch 24.

[0123] The air extraction module 3 includes an air extraction device 31 and a second connecting pipe assembly. The air extraction device 31 includes a second cylinder 311 and a second piston 312 movably connected to the second cylinder 311. The second piston 312 and the second cylinder 311 enclose a second cavity. The second connecting pipe assembly includes a third pipeline and a fourth pipeline. The third pipeline connects between the second cavity and the battery cavity and is provided with a third switch 32. The fourth pipeline connects between the second cavity and the external environment and is provided with a second one-way valve 33. The inlet end of the second one-way valve 33 is connected to the air extraction device 31, and the outlet end of the second one-way valve 33 is connected to the external environment.

[0124] The linkage module 4 includes a linkage member 41, an elastic member 42, and a control device 43. The linkage member 41 is connected to the first piston 212 and the second piston 312. The linkage member 41 has a first position and a second position, and the linkage member 41 can move between the first position and the second position. The elastic member 42 is connected to the linkage member 41, and when the linkage member 41 is in the second position, the elastic member 42 is in an elastically deformed state. The control device 43 includes a programmable logic controller 431 and a digital signal processor 432. The inductive switch 5 includes a light source 51 and a light sensing element 52 arranged relative to each other. The inductive switch 5 is respectively set in the first position and the second position. The linkage member 41 includes a light shielding portion 411. The movement path of the linkage member 41 is located between the light source 51 and the light sensing element 52, and the light shielding portion 411 can block the light emitted by the light source 51 to the light sensing element 52, so that the inductive switch 5 can be triggered and output a signal to the control device 43.

[0125] The first gas replenishment process of the battery gas replenishment device 10 in the embodiment of the present application is described below.

[0126] The battery air-inflating device 10 is connected to the gas circuit of the battery cavity. The programmable logic controller 431 opens the first switch 22 of the first pipeline and the third switch 32 of the third pipeline. The battery air-inflating device 10 is in the exhaust state. The gas source 1 inflates the first cavity of the inflating device 21 through the first one-way valve 23. The first piston 212 moves relative to the first cylinder 211. The first piston 212 acts on the linkage 41, causing the linkage 41 to move from the first position to the second position. The linkage 41 drives the second piston 312 to move relative to the second cylinder 311, and the exhaust device 31 extracts the gas in the battery cavity into the second cavity.

[0127] When the linkage 41 moves to the second position, the shading portion 411 thereon is located in the same straight line as the light source 51 and the photosensitive element located in the second position. The shading portion 411 blocks the light emitted by the light source 51, and the photosensitive element transmits the signal to the digital signal processor 432. The processed signal is transmitted to the programmable logic controller 431. The programmable logic controller 431 closes the first switch 22 of the first pipeline and the third switch 32 of the third pipeline, and opens the second switch 24 of the second pipeline. The battery air replenishing device 10 switches to the inflation state.

[0128] Under the restoring force of the elastic member 42, the linkage member 41 moves from the second position toward the first position, driving the first piston 212 relative to the first cylinder 211. The inert gas in the first chamber enters the battery chamber through the second pipeline. Simultaneously, the linkage member 41 also drives the second piston 312 relative to the second cylinder 311. The gas extracted from the second chamber is discharged to the external environment through the second one-way valve 33.

[0129] When the linkage 41 moves to the first position, the shading portion 411 thereon is located in the same straight line as the light source 51 and the photosensitive element located in the first position. The shading portion 411 blocks the light emitted by the light source 51, and the photosensitive element transmits the signal to the digital signal processor 432. The processed signal is transmitted to the programmable logic controller 431. The programmable logic controller 431 closes the second switch 24 of the second pipeline, opens the first switch 22 of the first pipeline, and opens the third switch 32 of the third pipeline. The battery air replenishing device 10 switches to the exhaust state, and one air replenishing action is completed.

[0130] The battery air supply device 10 in the embodiment of the present application can form a breathing air supply structure to coordinate the operation of the air supply module 3 and the air supply module 2 by alternately connecting the air extraction device 31 and the air filling device 21 to the battery cavity, control the internal pressure of the battery, and maintain the oxygen concentration in the battery cavity at a low level, effectively reducing the risk of open flame and explosion during thermal runaway of the battery device 210, and improving the reliability of the battery device 210.

[0131] The embodiment of the present application further provides a battery protection system 100 , which includes the battery air replenishing device 10 in the above embodiment, so the same technical effects are not described in detail here.

[0132] See also Figures 1 to 5 , Figure 5 A schematic structural diagram of a battery protection system provided in some embodiments of the present application is shown.

[0133] In some optional embodiments, the battery protection system 100 is used for an energy storage device 200, which includes multiple battery devices 210. The battery protection system 100 also includes a transfer pipe group 6, which includes a main pipe 61 and multiple branch pipes 62. The main pipe 61 is connected to the battery air replenishment device 10, and one end of the multiple branch pipes 62 is connected to the main pipe 61, and the other end is respectively connected to one of the battery devices 210.

[0134] When the energy storage device 200 includes multiple battery devices 210, by making the battery protection system also include a transfer tube group 6, and using the transfer tube group 6 to connect the battery gas replenishing device 10 to the multiple battery devices 210 respectively, the same battery gas replenishing device 10 can be used to replenish gas for the multiple battery devices 210 at the same time, thereby improving the gas replenishment efficiency of the battery protection system 100.

[0135] In some optional embodiments, the main line 61 is provided with a main line switch 611, which can be used to control the connection and disconnection between the battery air replenishing device 10 and the main line 61, and / or, at least part of the branch line 62 is provided with a branch line switch 621, which can be used to control the connection and disconnection between the main line 61 and the branch line 62.

[0136] By providing the main switch 611 and / or the branch switch 621, inert gas can be replenished to multiple battery devices 210. Furthermore, by providing the branch switch 621 to at least some of the branch lines 62, inert gas can be replenished to some of the battery devices 210 individually, thereby achieving independent control of some of the battery devices 210 and improving the reliability of the battery protection system 100.

[0137] Furthermore, at least two branch pipelines 62 intersect to form a confluence pipeline, the branch pipeline 62 is connected to the main pipeline 61 through the confluence pipeline, and the branch switch 621 is provided on the confluence pipeline.

[0138] As an optional implementation, since multiple battery units 210 in an energy storage container can be combined to form a battery cluster, when at least two branch lines 62 converge to form a busbar, each busbar can be configured to correspond to a single battery cluster. By installing branch switches 621 in the busbars, inert gas can be replenished individually for each battery cluster, improving the reliability of the battery protection system 100.

[0139] In some optional embodiments, the battery protection system 100 further includes a monitoring device, a control box 220 and a transport device 7. The monitoring device is used to detect the operating status information of the battery device 210. The control box 220 is configured to control the transport device 7 to transport the battery device 210 to a predetermined area when the operating status information is abnormal.

[0140] Because the energy storage container includes multiple battery units 210, if thermal runaway of a single battery unit 210 is not promptly addressed, the heat spread could cause the entire energy storage container to spontaneously combust, resulting in an uncontrollable fire. By controlling the transport device 7 to transport a battery unit 210 to a predetermined area when the operating status information of any battery unit 210 is abnormal, the impact of any abnormal operating status information of a battery unit 210 on other battery units 210 can be reduced.

[0141] Alternatively, the monitoring device may be a sensor installed within the battery unit 210, and the control box 220 may be a battery management system installed within the energy storage container. When the operating status information of the battery unit 210 becomes abnormal, the sensor within the battery unit 210 sends a signal to the battery management system. After processing, the signal is transmitted to the transport device 7, which can then transport the abnormal battery unit 210 to a predetermined area to minimize the impact on other battery units 210.

[0142] Optionally, the handling device 7 can be positioned on the side of the energy storage container where the container door is located, and the battery refilling device 10 can be positioned on the other side of the energy storage container. By positioning the handling device 7 on the side of the energy storage container where the container door is located, if the operating status information of any battery device 210 becomes abnormal, the handling device 7 can more easily be used to move the battery device 210 out of the container door, thereby improving handling convenience.

[0143] In some optional embodiments, the battery protection system 100 further includes a cooling container 8, which is used to store a fire extinguishing medium. The control box 220 is further configured to control the transport device 7 to immerse the battery device 210 in the fire extinguishing medium when an abnormality occurs in the operating status information of the battery device 210.

[0144] Alternatively, the extinguishing medium may be water.

[0145] Since it is difficult to extinguish the battery device 210 after thermal runaway occurs, a cooling container 8 storing a fire extinguishing medium is provided. After the fire risk of the battery device 210 is confirmed, the fire triangle fire extinguishing principle can be combined to move the battery device 210 out of the energy storage container through the transport device 7 and immerse it in the fire extinguishing medium, so that immersion cooling can be performed, effectively reducing the temperature and cutting off the chain reaction of thermal runaway to achieve fire extinguishing without re-ignition, effectively reducing the risk of fire spread.

[0146] See also Figures 1 to 5 The battery protection system 100 in the embodiment of the present application may include a transfer tube group 6, a monitoring device, a control box 220, a transport device 7 and a cooling container 8.

[0147] The transfer pipe assembly 6 includes a main line 61 and multiple branch lines 62. The main line 61 is connected to the battery gas supply device 10. Multiple branch lines 62 have one end connected to the main line 61 and the other end connected to a corresponding battery device 210. The main line 61 is equipped with a main line switch 611, which can be used to control the connection between the battery gas supply device 10 and the main line 61. The branch lines 62 corresponding to the battery devices 210 corresponding to the same battery cluster intersect to form a converging line. This converging line is equipped with a branch switch 621, which enables the independent replenishment of inert gas to each battery cluster, thereby improving the reliability of the battery protection system 100.

[0148] The monitoring device is used to detect the operating status information of the battery device 210. The control box 220 is configured to control the transport device 7 to transport the battery device 210 to the cooling container 8 and immerse it in the fire extinguishing medium when the operating status information is abnormal.

[0149] The battery protection system 100 in the embodiment of the present application can be based on the combination of the battery air replenishing device 10 and the transporting device 7, combined with the perspective of eliminating combustible materials and heat. The battery air replenishing device 10 can replenish inert gas into the battery device 210, thereby reducing the risk of deflagration and explosion of the thermal runaway battery device 210 during transportation. The battery device 210 is transported out of the energy storage device 200 using the transporting device 7 and immersed in a cooling container 8 filled with a cooling liquid such as water for immersion cooling, which can effectively reduce the risk of fire spread and improve the reliability of the use of the energy storage device 200.

[0150] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery air replenishing device, characterized in that: include: A gas source, for providing gas; An inflation module, comprising an inflation device and a first connecting pipe assembly, wherein the inflation device is connected to the gas source and the battery cavity through the first connecting pipe assembly; An air extraction module, comprising an air extraction device and a second connecting pipe group, wherein the air extraction device is connected to the battery cavity through the second connecting pipe group; a linkage module connected to the inflation module and the exhaust module, the linkage module comprising a linkage member and a control device, the linkage member having a first position and a second position, the linkage member being movable between the first position and the second position, the control device being configured to control the exhaust device and the inflation device to alternately communicate with the battery cavity according to the position of the linkage member; Among them, the inflation device has a first cavity with variable volume, the exhaust device has a second cavity with variable volume, the linkage is connected to the inflation device and the exhaust device, and can drive the volume of the first cavity and the second cavity to increase or decrease synchronously.

2. The battery air replenishing device according to claim 1, characterized in that: The inflation device includes a first cylinder and a first piston movably connected to the first cylinder, wherein the first piston and the first cylinder enclose a first cavity; The air extraction module includes a second cylinder and a second piston movably connected to the second cylinder. The second piston and the second cylinder enclose a second cavity, and the linkage is connected to the first piston and the second piston.

3. The battery air replenishing device according to claim 1, characterized in that: The first connecting pipe group includes a first pipeline and a first switch arranged on the first pipeline. The first pipeline is connected between the first cavity and the gas source. The control device is configured to control the vacuum device to be connected to the battery cavity and control the first switch to be closed when the linkage is in the first position, so as to push the linkage from the first position to the second position through the gas source.

4. The battery air replenishing device according to claim 3, characterized in that: The control device is further configured to control the first switch to be disconnected when the linkage member is in the second position. The linkage module further includes an elastic member connected to the linkage member, and when the linkage member is in the second position, the elastic member is in an elastically deformed state.

5. The battery air replenishing device according to claim 3, characterized in that: The first connecting pipe assembly further includes a first one-way valve provided in the first pipeline, wherein an inlet end of the first one-way valve is connected to the gas source, and an outlet end of the first one-way valve is connected to the first cavity.

6. The battery air replenishing device according to any one of claims 1 to 5, characterized in that: The first connecting tube group includes a second tube connected to the inflation device, and the second connecting tube group includes a third tube connected to the exhaust device. The ends of the second tube and the third tube intersect to form a battery interface for connecting to the battery cavity.

7. The battery air replenishing device according to claim 6, characterized in that: The first connecting pipe group also includes a second switch arranged in the second pipeline, and the second connecting pipe group also includes a third switch arranged in the third pipeline. The control device is configured to control the second switch to be opened and the third switch to be closed when the linkage is in the first position, and to control the second switch to be closed and the third switch to be opened when the linkage is in the second position.

8. The battery air replenishing device according to any one of claims 1 to 5, characterized in that: The second connecting pipe group also includes a fourth pipeline and a second one-way valve arranged on the fourth pipeline. The fourth pipeline is used to connect the air extraction device with the external environment. The inlet end of the second one-way valve is connected to the air extraction device, and the outlet end of the second one-way valve is connected to the external environment.

9. The battery air replenishing device according to any one of claims 1 to 5, characterized in that: The battery air replenishing device further includes an induction switch, which is respectively arranged at the first position and the second position, and the control device is connected to the induction switch.

10. The battery air replenishing device according to claim 9, characterized in that: The linkage member includes a shading portion, and the induction switch includes a light source and a light sensing element arranged relatively to each other. When the linkage member is located at the first position and the second position, the movement path of the linkage member is located between the light source and the light sensing element, and the light emitting from the light source to the light sensing element can be blocked by the shading portion.

11. The battery air replenishing device according to claim 9, characterized in that: The battery air replenishing device further includes a detection module, which is connected to the induction switch and is configured to detect the number of times the linkage member passes through the first position and / or the second position.

12. A battery protection system, characterized in that: The battery gas replenishing device comprises the battery gas replenishing device according to any one of claims 1 to 11.

13. The battery protection system according to claim 12, characterized in that: The battery protection system is used for an energy storage device, which includes multiple battery devices. The battery protection system also includes a transfer pipe group, which includes a main pipe and multiple branch pipes. The main pipe is connected to the battery air supply device, and one end of the multiple branch pipes is connected to the main pipe, and the other end is respectively connected to one of the battery devices.

14. The battery protection system according to claim 13, characterized in that: The main line is provided with a main line switch, which can be used to control the connection and disconnection between the battery air replenishing device and the main line, and / or at least some of the branch lines are provided with branch line switches, which can be used to control the connection and disconnection between the main line and the branch lines.

15. The battery protection system according to claim 14, characterized in that: At least two of the branch pipelines intersect to form a confluence pipeline, the branch pipelines are connected to the main pipeline through the confluence pipeline, and the branch switch is arranged on the confluence pipeline.

16. The battery protection system according to any one of claims 13 to 15, characterized in that: The battery protection system also includes a monitoring device, a control box and a transport device. The monitoring device is used to detect the operating status information of the battery device. The control box is configured to control the transport device to transport the battery device to a predetermined area when the operating status information is abnormal.

17. The battery protection system according to claim 16, characterized in that: The battery protection system further includes a cooling container for storing a fire extinguishing medium. The control box is further configured to control the transport device to immerse the battery device in the fire extinguishing medium when an abnormality occurs in the operating status information of the battery device.

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