Energy storage device, energy storage system and charging network

Abstract

The utility model discloses an energy storage device, an energy storage system and a charging network, the energy storage device comprises at least one battery device, the battery device comprises: a battery box having an accommodating space, the first box wall of the battery box being provided with a mounting hole; the at least one battery monomer is arranged in the accommodating space; the explosion-proof valve is connected to the mounting hole, the explosion-proof valve comprises a valve body, the valve body is provided with an inner cavity and an air leakage hole formed in the inner cavity, and the air leakage hole can be closed or opened so as to close the accommodating space or enable the accommodating space to be communicated with the external environment of the battery box through the explosion-proof valve; the explosion-proof valve further comprises an environment index detection device and a signal sending device, the environment index detection device is used for detecting environment indexes in the inner cavity, and the signal sending device is used for sending out abnormal signals under the condition that the environment indexes meet set conditions. According to the energy storage device, the energy storage system and the charging network provided by the invention, the thermal runaway degree can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to energy storage devices, energy storage systems and charging networks. Background Art

[0002] An energy storage device is a device used to store electrical energy. It has a battery device inside and is easy to install and transport, has a high degree of integration, occupies a small area, and has good scalability. It is an important part of the development of distributed energy, smart grids, and energy Internet in the energy storage field.

[0003] Due to internal and external factors, battery devices may cause short circuits between the positive and negative electrodes or irreversible chemical reactions in the materials, releasing a large amount of heat in a short period of time, causing thermal runaway, and ultimately may cause fire or explosion. How to reduce the degree of thermal runaway is one of the topics that the industry needs to study. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides an energy storage device, an energy storage system and a charging network that can reduce the degree of thermal runaway.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of the present application provides an energy storage device, comprising at least one battery device, the battery device comprising: a battery box having a storage space, a first box wall of the battery box being provided with a mounting hole; at least one battery cell being arranged in the storage space; an explosion-proof valve comprising a valve body, the valve body having an inner cavity and an air leakage hole arranged in the inner cavity, the air leakage hole being configured to be closed or opened to close the storage space or to allow the storage space to communicate with the external environment of the battery box through the explosion-proof valve; the explosion-proof valve further comprising an environmental indicator detection device and a signal issuing device, the environmental indicator detection device being arranged in the inner cavity and used for detecting environmental indicators in the inner cavity, the signal issuing device being used for issuing an abnormal signal when the environmental indicator reaches a set condition.

[0007] In the technical solution of the embodiment of the present application, when the battery device in the energy storage device is in a normal state, the vent hole is closed, the explosion-proof valve is in a closed state, so that the accommodation space is in a sealed state. When the battery device has thermal runaway, the vent hole can be opened, and the explosion-proof valve of the battery device is in an open state, so that the accommodation space is connected to the external environment of the battery box through the explosion-proof valve, and the gas and heat in the accommodation space can be discharged from the battery box through the explosion-proof valve to relieve pressure. In addition, in the process of gas and heat passing through the inner cavity, the environmental index measured by the environmental index detection device changes. When the environmental index measured by the environmental index detection device reaches the set condition, the signal issuing device sends an abnormal signal to facilitate the timely disassembly and replacement of the abnormal battery device. Furthermore, when there are more than two battery devices in the energy storage device, the explosion-proof valves of one or several of the battery devices send out abnormal signals, which makes it easy to find the abnormal battery device from the numerous battery devices in time, thereby facilitating the timely disassembly and replacement of the abnormal battery device, thereby reducing the impact on other normal battery devices, timely controlling the continued expansion of thermal runaway, and reducing the degree of loss of control when thermal runaway occurs in the energy storage device.

[0008] In some embodiments, the explosion-proof valve also includes a valve core, which is arranged in the inner cavity, and the valve core is configured to open the air leakage hole when the air pressure value in the accommodating space reaches an air pressure threshold, and close the air leakage hole when the air pressure threshold is not reached.

[0009] In this way, the explosion-proof valve can achieve the pressure relief and explosion-proof effect. When the explosion-proof valve is relieving pressure, it sends out an abnormal signal, so that the abnormal battery device can be disassembled and replaced in time. In addition, when there are more than two battery devices in the energy storage device, the explosion-proof valve of one or several battery devices sends out an abnormal signal, so that the abnormal battery device can be found from the many battery devices in time, so that the abnormal battery device can be disassembled and replaced in time, thereby reducing the impact on other normal battery devices, timely controlling the continued expansion of thermal runaway, and reducing the degree of out-of-control when thermal runaway occurs in the energy storage device.

[0010] In some embodiments, the environmental indicator includes a gas concentration value, the set condition includes a gas concentration threshold, the environmental indicator detection device includes a gas concentration detection device, and the gas concentration detection device is used to detect the gas concentration value of the gas in the inner cavity; the signal issuing device is used to issue the abnormal signal when the gas concentration value reaches the gas concentration threshold.

[0011] In this way, when thermal runaway occurs, the vent hole is opened, and the gas in the accommodation space enters the inner cavity of the explosion-proof valve through the vent hole, causing the gas concentration in the inner cavity to increase, so that the gas concentration value detected by the gas concentration detection device increases to the gas concentration threshold, and then the signal issuing device sends an abnormal signal, realizing the alarm function of the explosion-proof valve. When the battery device has thermal runaway, the explosion-proof valve not only exhausts and releases pressure, but also sends an abnormal signal to alarm.

[0012] In some embodiments, the signal emitting device includes a sound emitting device and / or a light emitting device.

[0013] In this way, the abnormal signal emitted by the signal emitting device is a sound and / or light, which prompts the battery device equipped with the signal emitting device to have thermal runaway, so as to facilitate the timely removal and replacement of the abnormal battery device. In addition, in the case where there are more than two battery devices in the energy storage device, the explosion-proof valve of one or several of the battery devices emits an abnormal signal, which facilitates timely finding the abnormal battery device from the numerous battery devices, thereby facilitating the timely removal and replacement of the abnormal battery device, thereby reducing the impact on other normal battery devices, timely controlling the continued expansion of thermal runaway, and reducing the degree of loss of control when thermal runaway occurs in the energy storage device.

[0014] In some embodiments, the explosion-proof valve also includes an elastic member, one end of the elastic member is connected to the valve body, and the other end is connected to the valve core. When the air pressure value in the accommodating space does not reach the air pressure threshold, the valve core closes the air leakage hole under the elastic force of the elastic member. When the air pressure value reaches the air pressure threshold, the valve core moves away from the air leakage hole under the action of the air pressure to open the air leakage hole.

[0015] In this way, the valve core can close and open the air leakage hole by setting the elastic member, and the elastic member has a simple structure and low cost.

[0016] In some embodiments, the inner cavity includes a first cavity, the first cavity is defined between a first wall and a second wall axially opposite to each other along the mounting hole, the air leakage hole is formed on the first wall, the second wall is formed with a first air vent, the elastic member and the valve core are both arranged in the first cavity, one end of the elastic member is connected to the second wall, and the other end extends toward the first wall and is connected to the valve core.

[0017] In this way, the valve core can close the air leakage hole and open the air leakage hole, and the installation structure of the elastic member is simple and the assembly efficiency is high.

[0018] In some embodiments, the valve core includes a main body and a flange arranged on the outer peripheral edge of the main body, and the flange is folded toward a side close to the first wall relative to the main body. When the air pressure value does not reach the air pressure threshold, the flange abuts against the first wall and surrounds the air leakage hole.

[0019] In this way, when the valve core abuts against the first wall to close the air leakage hole, there is a gap between the main body and the first wall, so that the force of the valve core on the first wall is applied through the flange, so that the flange abuts against the first wall with a greater pressure, thereby improving the sealing of the air leakage hole.

[0020] In some embodiments, the cuff is made of elastic material.

[0021] In this way, when the flange is pressed against the first wall, the flange will deform adaptively according to the shape of the first wall, so that the flange is closely abutted against the first wall, thereby improving the sealing performance of the air leakage hole.

[0022] In some embodiments, the first wall is further formed with a groove surrounding the air leakage hole, and when the air pressure value does not reach the air pressure threshold, the outer edge of the flange is pressed into the groove.

[0023] By pressing the outer edge of the flange into the groove, the tightness of the valve core in closing the air leakage hole is improved.

[0024] In some embodiments, the environmental indicator detection device is disposed in the first vent.

[0025] The flow area of ​​the first vent is smaller than that of the first cavity, and the gas in the first vent is relatively concentrated. The environmental indicator detection device is arranged in the first vent, so that the abnormal indicator can be detected more quickly when the gas passes through the environmental indicator detection device, so that the abnormal signal can be sent in time, and the further expansion of the thermal runaway can be controlled in time, thereby reducing the degree of loss of control when the energy storage device suffers from thermal runaway.

[0026] In some embodiments, the valve body further has a gas sensing cavity, the gas sensing cavity is connected to the first cavity through the first vent hole, and the environmental indicator detection device is disposed in the gas sensing cavity.

[0027] The gas in the first cavity enters the gas sensing cavity through the first vent hole. The gas sensing cavity can concentrate the gas so that the environmental indicator detection device in the gas sensing cavity can detect abnormal indicators more quickly when the gas passes through the environmental indicator detection device in the gas sensing cavity, thereby being able to send out abnormal signals in time, and timely control the continued expansion of thermal runaway, thereby reducing the degree of out-of-control when thermal runaway occurs in the energy storage device.

[0028] In some embodiments, along the axial direction of the mounting hole, the flow area of ​​the end of the gas sensing cavity close to the first cavity is larger than the flow area of ​​the end away from the first cavity, and the environmental indicator detection device is arranged at the end of the gas sensing cavity away from the first cavity.

[0029] In this way, the gas is more concentrated when passing through the end of the gas sensing chamber away from the first chamber, so that the abnormal index can be detected more quickly when the gas passes through the environmental index detection device, so that the battery device can send an abnormal signal in time, so as to timely control the continued expansion of thermal runaway, thereby reducing the degree of out-of-control when thermal runaway occurs in the energy storage device.

[0030] In some embodiments, the inner cavity further includes a second cavity, the second wall separates the second cavity and the first cavity, and the signal emitting device is disposed on an outer wall of the valve body corresponding to the second cavity.

[0031] In this way, the environmental indicator detection device and the signal issuing device are close to each other, the connection circuit between the two is shorter, and the position distribution is reasonable.

[0032] In some embodiments, a power supply device for supplying power to the environmental indicator detection device and the signal emitting device is disposed in the second cavity.

[0033] In this way, the power supply device provides power for the alarm of the explosion-proof valve and is arranged in the second cavity, which is beneficial to shortening the connection circuit between the power supply device and the environmental indicator detection device and the signal issuing device.

[0034] In some embodiments, the inner cavity further includes a third cavity, the third cavity and the second cavity are separated by a third wall, the third wall is arranged on the side of the second wall facing away from the first wall, and the wall surface of the third cavity opposite to the third wall is provided with an exhaust hole.

[0035] In this way, the third wall blocks the electrical components such as the environmental indicator detection device and the signal sending device and the exhaust hole, which is beneficial to reduce the probability of water vapor from outside the battery box entering the third cavity and contacting and adhering to the electrical components such as the environmental indicator detection device and the signal sending device, thereby protecting the electrical components.

[0036] In some embodiments, a connecting sleeve is formed at one end of the valve body, an internal channel of the connecting sleeve extends along the axial direction of the mounting hole and is connected to the air leakage hole, and the connecting sleeve is penetrated and fixed in the mounting hole.

[0037] In this way, the gas in the accommodating space can enter the first cavity through the internal channel of the connecting sleeve and the air leakage hole in sequence, thereby realizing the air leakage function. In addition, the connecting sleeve is inserted into and fixed to the mounting hole, and the connection strength is high.

[0038] In some embodiments, a thread is formed on the outer circumferential surface of the connecting sleeve, and the connecting sleeve passes through the mounting hole and is fastened by a threaded sleeve.

[0039] In this way, the connecting sleeve passes through the mounting hole and is fastened by the threaded sleeve, thereby realizing the installation of the valve body on the mounting hole of the battery box. The connecting sleeve has a simple structure and high connection reliability.

[0040] In some embodiments, an outer peripheral surface of the connecting sleeve is formed with an external thread, an inner surface of the mounting hole is formed with an internal thread, and the external thread of the connecting sleeve is threadedly connected with the internal thread of the mounting hole.

[0041] In some embodiments, the outer circumference of the connecting sleeve surrounds a limiting groove, and a sealing ring is also sleeved on the outer circumference of the connecting sleeve. The sealing ring is limited in the limiting groove and abuts against the outer surface of the first box wall.

[0042] In this way, by providing the limiting groove and the sealing ring, the sealing performance of the connection between the valve body and the mounting hole is improved, thereby improving the sealing performance of the accommodating space.

[0043] A second aspect of the present application provides an energy storage system, comprising a power conversion device and the energy storage device provided by the first aspect, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0044] Since the energy storage system includes the above-mentioned energy storage device, the energy storage system has all the beneficial effects of the energy storage device, and therefore, the energy storage system can reduce the degree of thermal runaway.

[0045] A third aspect of the present application provides a charging network, comprising a charging pile and the energy storage device provided in the first aspect or the energy storage system provided in the second aspect, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0046] Since the charging network includes the above-mentioned energy storage device or the above-mentioned energy storage system, the charging network has all the beneficial effects of the energy storage device or the energy storage system, and therefore, the charging network can reduce the degree of thermal runaway.

[0047] The beneficial effects of the embodiments of the present disclosure include: through the present application, an energy storage device, an energy storage system and a charging network that can reduce the degree of thermal runaway are provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0049] Figure 1 is a schematic diagram of a three-dimensional structure of an energy storage device according to one or more embodiments;

[0050] Figure 2 is a schematic diagram of a three-dimensional structure of a battery device according to one or more embodiments;

[0051] Figure 3 is a schematic diagram of a three-dimensional structure of a battery cell according to one or more embodiments;

[0052] Figure 4 is a perspective exploded view of a battery cell according to one or more embodiments;

[0053] Figure 5 is a front view of an explosion-proof valve according to one or more embodiments;

[0054] Figure 6 for Figure 5 A cross-sectional view at AA of a structure in FIG.

[0055] Figure 7 for Figure 5 A cross-sectional view at AA of another structure;

[0056] Figure 8 is a top view of an explosion-proof valve according to one or more embodiments;

[0057] Fig. 9 is a schematic structural diagram of an energy storage system according to one or more embodiments;

[0058] Fig.10 is a schematic diagram of a charging network according to one or more embodiments.

[0059] Description of Reference Numerals

[0060] 1000 energy storage device; 200 cabinet; 210 communication interface; 220 power transmission interface; 100 battery device; 10 battery box; 101 box cover; 1011 mounting hole; 102 box; 20 battery cell; 201 battery shell; 2011 end cover; 2012 battery shell; 202 electrode assembly; 2021 pole ear; 203 adapter component; 204 pressure relief mechanism; 205 electrode terminal; 30 explosion-proof valve; 1 valve body; 111 air leakage hole; 112 exhaust hole; 113 first vent hole; 11 first wall; 12 second wall; 13 third wall; 14 gas sensing chamber; 15 first chamber; 16 second chamber; 17 third chamber; 18 connecting sleeve; 181 limit groove; 19 sealing ring; 2 valve core; 21 main body; 22 flange; 3 Gas concentration detection device; 4 Signal sending device; 5 Elastic part; 6 Signal processor; 7 Power supply device; 8 Threaded sleeve; 2000 Energy storage system; 3000 Power conversion device; 4000 Power generation device; 5000 Charging pile; 6000 Charging network; 7000 Connector. DETAILED DESCRIPTION

[0061] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0063] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0064] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0066] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0067] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0068] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0069] Below, this application is described in detail.

[0070] Energy storage devices are devices used to store electrical energy. They have batteries placed inside them. They are easy to install and transport, highly integrated, small in footprint, and highly expansible. They are an important part of the development of distributed energy, smart grids, and energy internet in the energy storage field. With the rapid development of new energy technologies, energy storage devices have become one of the more important research directions in the new energy field.

[0071] When a battery device in an energy storage device experiences thermal runaway, if the battery device in thermal runaway cannot be discovered in time, the battery device cannot be processed in time, and the degree of thermal runaway of the energy storage device will become more and more serious, and even fire and explosion may occur.

[0072] In this regard, the present application designs an energy storage device, including at least one battery device, the battery device including a battery box, an explosion-proof valve and at least one battery cell, the battery box has a accommodating space, and the first box wall of the battery box is provided with a mounting hole; at least one battery cell is arranged in the accommodating space; the explosion-proof valve is connected to the mounting hole, and the explosion-proof valve is configured to send an abnormal signal during the process of the explosion-proof valve relieving pressure.

[0073] When the battery device in the energy storage device is in a normal state, the explosion-proof valve is in a closed state, so that the accommodation space is in a sealed state. When the battery device has thermal runaway, the explosion-proof valve of the battery device is in an open state, so that the accommodation space is connected to the external environment of the battery box through the explosion-proof valve, and the gas and heat in the accommodation space can be discharged from the battery box through the explosion-proof valve to relieve pressure, and the explosion-proof valve sends an abnormal signal to facilitate the timely disassembly and replacement of the abnormal battery device. In addition, in the case where there are more than two battery devices in the energy storage device, the explosion-proof valve of one or several battery devices sends an abnormal signal, which is convenient for timely finding the abnormal battery device from the numerous battery devices, so as to facilitate the timely disassembly and replacement of the abnormal battery device, thereby reducing the impact on other normal battery devices, timely controlling the continued expansion of thermal runaway, and reducing the degree of out-of-control when the energy storage device has thermal runaway.

[0074] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0075] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0076] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters, and the battery clusters are accommodated in the cabinet. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0077] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0078] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for regulating the temperature of the battery cells to each battery device through a pipeline.

[0079] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The main control module includes a slave battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch and other modules.

[0080] As an example, the master control module can be used as a battery management unit of an energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device. For example, the charging and discharging current, voltage, etc. of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module.

[0081] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., which are used to detect, alarm or extinguish fire in the energy storage system.

[0082] As an example, the power distribution device may be used to distribute power to the power modules of the energy storage device.

[0083] In the embodiments of the present application, a plurality means more than two.

[0084] Figure 1 It is a schematic diagram of the three-dimensional structure of an energy storage device according to one or more embodiments.

[0085] Reference Figure 1 , the energy storage device 1000 may include a cabinet 200 and at least one battery device 100 stored in the cabinet 200. The energy storage device 1000 may also include a communication interface 210 and a power transmission interface 220 disposed in the cabinet 200. In some embodiments, the interior of the cabinet 200 may be divided into a battery compartment and an electrical compartment, the battery device 100 is usually placed in the battery compartment, the main control module, the master control module, etc. are usually configured in the electrical compartment, and the communication interface 210 and the power transmission interface 220 may be electrically connected to the main control module, the master control module, etc. in the electrical compartment.

[0086] Figure 2 is a schematic diagram of a three-dimensional structure of a battery device according to one or more embodiments.

[0087] In some embodiments of the present application, Figure 2As shown, the battery device 100 includes a battery box 10 and at least one battery cell 20 . The battery box 10 has a receiving space, and the at least one battery cell 20 is received in the receiving space.

[0088] In some embodiments of the present application, the battery box 10 includes a box body 102 and a box cover 101 , and the box cover 101 covers the box body 102 , so that the accommodating space is formed between the box body 102 and the box cover 101 .

[0089] The box body 102 may be a hollow structure with one end open, and the box cover 101 may be a plate-like structure, and the box cover 101 covers the open side of the box body 102, so that the box cover 101 and the box body 102 jointly define a storage space; the box cover 101 and the box body 102 may also be hollow structures with one side open, and the open side of the box cover 101 covers the open side of the box body 102. Of course, the battery box 10 formed by the box cover 101 and the box body 102 may be in various shapes, such as a cylinder, a cuboid, etc.

[0090] In the battery device 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is placed in the accommodation space formed by the box body 102 and the box cover 101; of course, the battery device 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation space formed by the box body 102 and the box cover 101. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0091] The battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0092] The battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0093] Figure 3 is a schematic diagram of a three-dimensional structure of a battery cell according to one or more embodiments. Figure 4 It is a perspective exploded schematic diagram of a battery cell according to one or more embodiments.

[0094] like Figure 3 and Figure 4As shown, the battery cell 20 includes an electrode assembly 202. The electrode assembly 202 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing the active ions to pass through.

[0095] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0096] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0097] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0098] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0099] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0100] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0101] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as a metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0102] In some embodiments, the electrode assembly 202 further includes a separator disposed between the positive electrode and the negative electrode.

[0103] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0104] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0105] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0106] In some embodiments, the battery cell 20 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0107] In some embodiments, the electrode assembly 202 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0108] In some embodiments, the electrode assembly 202 is a laminate structure.

[0109] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0110] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0111] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0112] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0113] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0114] In some embodiments, the shape of the electrode assembly 202 can be cylindrical, flat, or polygonal.

[0115] In some embodiments, the electrode assembly 202 is provided with tabs 2021, which can conduct current from the electrode assembly 202. The tabs 2021 include a positive tab and a negative tab.

[0116] In some embodiments, the battery cell 20 may include a battery housing 201. The battery housing 201 is used to encapsulate the electrode assembly 202 and electrolyte and other components. The battery housing 201 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0117] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in the present application.

[0118] In some embodiments, the battery housing 201 includes an end cap 2011 and a battery shell 2012. The battery shell 2012 is provided with an opening, and the end cap 2011 closes the opening to form a closed space for accommodating the electrode assembly 202 and electrolyte and other substances. The battery shell 2012 may be provided with one or more openings. One or more end caps 2011 may also be provided.

[0119] In some embodiments, at least one electrode terminal 205 is disposed on the battery housing 201, and the electrode terminal 205 is electrically connected to the tab 2021. The electrode terminal 205 can be directly connected to the tab 2021, or indirectly connected to the tab 2021 through the adapter 203. The electrode terminal 205 can be disposed on the end cap 2011, or on the battery housing 2012.

[0120] In some embodiments, a pressure relief mechanism 204 is provided on the battery housing 201. The pressure relief mechanism 204 is used to release the internal pressure of the battery cell.

[0121] like Figure 2As shown, the energy storage device 1000 also includes an explosion-proof valve 30, the first box wall of the battery box 10 is provided with a mounting hole 1011, the explosion-proof valve 30 is connected to the mounting hole 1011, the explosion-proof valve 30 includes a valve body 1, the valve body 1 has an inner cavity and an air leakage hole 111 provided in the inner cavity, the air leakage hole 111 is configured to be closed or opened to close the accommodating space or to make the accommodating space communicate with the external environment of the battery box 10 through the explosion-proof valve 30; the explosion-proof valve 30 also includes an environmental indicator detection device and a signal sending device 4, the environmental indicator detection device is provided in the inner cavity, and is used to detect the environmental indicator in the inner cavity, and the signal sending device 4 is used to send an abnormal signal when the environmental indicator reaches the set condition.

[0122] Exemplarily, the abnormal signal may be a sound, a light, or a digital signal sent by a sensor to a control device to indicate that thermal runaway has occurred in the battery device 100 that sent the abnormal signal.

[0123] Exemplarily, the environmental indicator detection device can be a device for detecting the concentration value of one gas or several gases, or a device for detecting the air pressure value in the inner cavity of the valve body, or a device for detecting the temperature value in the inner cavity of the valve body, or a device for detecting other environmental indicators, which are not specifically limited here.

[0124] Exemplarily, the environmental indicator can be the concentration value of one or several gases in the inner cavity of the valve body 1, or the air pressure value in the inner cavity of the valve body 1, or the temperature value in the inner cavity of the valve body 1. Of course, it can also be other environmental indicators, which are not specifically limited here.

[0125] The first box wall of the battery box 10 can be a wall panel of the box body 102 or a wall panel of the box cover 101, that is, the explosion-proof valve 30 can be installed on the box body 102 or the box cover 101, and the specific installation position is not specifically limited here.

[0126] When the battery device 100 in the energy storage device 1000 provided in the embodiment of the present application is in a normal state, the vent hole 111 is closed, and the explosion-proof valve 30 is in a closed state, so that the accommodation space is in a sealed state. When thermal runaway occurs in the battery device 100, the vent hole 111 can be opened, and the explosion-proof valve 30 of the battery device 100 is in an open state, so that the accommodation space is connected to the external environment of the battery box 10 through the explosion-proof valve 30, and the gas and heat in the accommodation space can be discharged from the battery box 10 through the explosion-proof valve 30 to relieve pressure. In addition, in the process of the gas and heat passing through the inner cavity, the environmental index in the inner cavity changes. When the environmental index measured by the environmental index detection device reaches the set condition, the signal issuing device sends an abnormal signal to facilitate the timely disassembly and replacement of the abnormal battery device 100. Furthermore, when there are more than two battery devices 100 in the energy storage device 1000, the explosion-proof valves 30 of one or several of the battery devices 100 send abnormal signals, which facilitates timely finding of the abnormal battery device 100 from the numerous battery devices 100, thereby facilitating timely disassembly and replacement of the abnormal battery device 100, thereby reducing the impact on other normal battery devices 100, timely controlling the continued expansion of thermal runaway, and reducing the degree of out-of-control when thermal runaway occurs in the energy storage device.

[0127] Below, refer to Figures 5 to 8 Some embodiments of the present application are described in detail.

[0128] Figure 5 is a front view of an explosion-proof valve according to one or more embodiments; Figure 6 for Figure 5 A cross-sectional view at AA of a structure in FIG. Figure 7 for Figure 5 A cross-sectional view at AA of another structure; Figure 8 is a top view of an explosion-proof valve according to one or more embodiments.

[0129] In some embodiments of the present application, Figure 5 and Figure 7 As shown, the explosion-proof valve 30 includes a valve body 1 and a valve core 2, the valve body 1 has an inner cavity and a bleed hole 111 and an exhaust hole 112 respectively arranged at both ends of the inner cavity along the axial direction X of the mounting hole 1011, the valve core 2 is arranged in the inner cavity, and the valve core 2 is configured to open the bleed hole 111 when the air pressure value in the accommodating space reaches an air pressure threshold, so that the accommodating space and the inner cavity are connected through the bleed hole 111, and close the bleed hole 111 when the air pressure value in the accommodating space does not reach the air pressure threshold.

[0130] When the air pressure value in the accommodating space does not reach the air pressure threshold, the valve core 2 closes the air leakage hole 111, so that the accommodating space is in a closed state; when the air pressure value in the accommodating space reaches the air pressure threshold, the valve core 2 opens the air leakage hole 111, so that the accommodating space and the inner cavity are connected through the air leakage hole 111. At this time, the gas and heat in the accommodating space can enter the inner cavity through the air leakage hole 111, and then be discharged outside the battery box 10 through the exhaust hole 112, thereby achieving the effect of pressure relief.

[0131] In this way, the explosion-proof valve 30 has a pressure relief and explosion-proof effect. When the explosion-proof valve 30 is releasing pressure, the explosion-proof valve 30 sends an abnormal signal, so that the abnormal battery device 100 can be disassembled and replaced in time. In addition, when there are more than two battery devices 100 in the energy storage device 1000, the explosion-proof valve 30 of one or several battery devices 100 sends an abnormal signal, so that the abnormal battery device 100 can be found from the numerous battery devices 100 in time, so that the abnormal battery device 100 can be disassembled and replaced in time, thereby reducing the impact on other normal battery devices 100, timely controlling the continued expansion of thermal runaway, and reducing the degree of out-of-control when thermal runaway occurs in the energy storage device.

[0132] In some embodiments of the present application, Figure 6 and Figure 7 As shown, the environmental indicator also includes a gas concentration value, the setting condition includes a gas concentration threshold, the environmental indicator detection device includes a gas concentration detection device 3, the gas concentration detection device 3 is arranged in the inner cavity, and is used to detect the gas concentration value of the gas in the inner cavity; the signal sending device 4 is arranged in the valve body 1, and is used to send an abnormal signal when the gas concentration value reaches the gas concentration threshold.

[0133] The gas concentration detection device 3 is a device for detecting the concentration value of one or more gases. When the battery device 100 is in a normal state, the concentrations of gas H2 and CO are relatively low; when the battery device 100 has thermal runaway, the concentrations of gas H2 and CO increase. Exemplarily, the gas concentration detection device 3 detects the concentrations of gas H2 and CO and whether they reach a preset gas concentration threshold. If it does not reach, it indicates that the battery device 100 is in a normal state. If it reaches, it indicates that the battery device 100 has thermal runaway, and the explosion-proof valve 30 sends an abnormal signal.

[0134] In this way, when thermal runaway occurs, the vent hole 111 is opened, and the gas in the accommodation space enters the inner cavity of the explosion-proof valve 30 through the vent hole 111, so that the gas concentration in the inner cavity increases, so that the gas concentration value detected by the gas concentration detection device 3 increases to the gas concentration threshold, and then the signal issuing device 4 issues an abnormal signal, realizing the alarm function of the explosion-proof valve 30. When thermal runaway occurs in the battery device 100, the explosion-proof valve 30 not only exhausts and releases pressure, but also issues an abnormal signal to alarm.

[0135] Exemplarily, the gas concentration detection device 3 uses an electrochemical sensor to detect whether the concentration of CO and H2 in the inner cavity reaches 0.4%, that is, the gas concentration threshold is set to 0.4%. A signal processor 6 is also connected between the gas concentration detection device 3 and the signal emitting device 4. The gas concentration detection device 3 transmits an electrical signal to the signal processor 6, and the signal processor 6 converts the electrical signal into a digital signal and transmits it to the signal emitting device 4. The signal emitting device 4 is triggered to emit an abnormal signal.

[0136] In some embodiments of the present application, the signal emitting device 4 includes a sound emitting device and / or a light emitting device.

[0137] For example, the sound-generating device may be, but not limited to, a speaker, a buzzer, etc. The light-emitting device may be, but not limited to, an LED lamp (Light-Emitting Diode Light), an incandescent lamp, a laser, a fluorescent lamp, etc.

[0138] In this way, the abnormal signal emitted by the signal emitting device 4 is a sound and / or light, which prompts the battery device 100 equipped with the signal emitting device 4 to have thermal runaway, so as to facilitate timely disassembly and replacement of the abnormal battery device 100. In addition, in the case where there are more than two battery devices 100 in the energy storage device 1000, the explosion-proof valve 30 of one or several battery devices 100 emits an abnormal signal, which facilitates timely finding the abnormal battery device 100 from the numerous battery devices 100, so as to facilitate timely disassembly and replacement of the abnormal battery device 100, thereby reducing the impact on other normal battery devices 100, timely controlling the continued expansion of thermal runaway, and reducing the degree of out-of-control when thermal runaway occurs in the energy storage device.

[0139] In some embodiments of the present application, Figure 6 and Figure 7 As shown, the explosion-proof valve 30 also includes an elastic member 5, one end of the elastic member 5 is connected to the valve body 1, and the other end is connected to the valve core 2. When the air pressure value in the accommodating space does not reach the air pressure threshold, the valve core 2 closes the air leakage hole 111 under the elastic force of the elastic member 5. When the air pressure value reaches the air pressure threshold, the valve core 2 moves away from the air leakage hole 111 under the action of the air pressure to open the air leakage hole 111.

[0140] The elastic member 5 is an elastic component, which may be, but is not limited to, a coil spring, a bent spring, a bellows, a rubber column, etc.

[0141] The valve core 2 closes the air leakage hole 111 by abutting against the wall provided with the air leakage hole 111 to close the opening of one end of the air leakage hole 111 facing away from the accommodation space of the battery box 10 , or at least a part of the valve core 2 is blocked in the air leakage hole 111 .

[0142] Exemplarily, the elastic member 5 is connected to the side of the valve core 2 facing away from the air leakage hole 111, and the elastic member 5 is in a compressed state. The elastic member 5 applies an elastic force toward the air leakage hole 111 to the valve core 2, so that the valve core 2 abuts against the wall surface of the outer periphery of the air leakage hole 111, thereby closing the air leakage hole 111, so that the air leakage hole 111 is not connected to the inner cavity of the valve body 1. When thermal runaway occurs, the air pressure in the accommodating space increases, and the air pressure is greater than the elastic force of the elastic member 5 on the valve core 2, so that the valve core 2 is away from the air leakage hole 111, thereby opening the air leakage hole 111, and allowing the gas to enter the inner cavity through the air leakage hole 111.

[0143] In this way, by disposing the elastic member 5 , the valve core 2 can achieve the function of closing and opening the air leakage hole 111 , and the elastic member 5 has a simple structure and low cost.

[0144] In some embodiments of the present application, Figure 6 and Figure 7 As shown, the inner cavity includes a first cavity 15, and the first cavity 15 is defined between a first wall 11 and a second wall 12 opposite to each other along the axial direction X of the mounting hole 1011. The air leakage hole 111 is formed on the first wall 11, and the second wall 12 is formed with a first air vent 113 connected to the exhaust hole 112. The elastic member 5 and the valve core 2 are both arranged in the first cavity 15, and one end of the elastic member 5 is connected to the second wall 12, and the other end extends toward the first wall 11 and is connected to the valve core 2.

[0145] Under normal conditions, the valve core 2 closes the bleed hole 111 under the action of the elastic force of the elastic member 5. When thermal runaway occurs, the air pressure increases, driving the valve core 2 to compress the elastic member 5. The valve core 2 opens the bleed hole 111, and the gas in the accommodating space enters the first cavity 15 through the bleed hole 111. Thereafter, the gas in the first cavity 15 is discharged to the external environment of the battery box 10 through the first vent hole 113 and the exhaust hole 112 in sequence.

[0146] Optionally, the elastic force direction of the elastic member 5 is consistent with the axial direction X of the mounting hole 1011 , or the elastic force direction of the elastic member 5 is at an acute angle to the axial direction X of the mounting hole 1011 .

[0147] In this way, the valve core 2 can close the air leakage hole 111 and open the air leakage hole 111, and the installation structure of the elastic member 5 is simple and the assembly efficiency is high.

[0148] In some embodiments of the present application, Figure 7 As shown, the valve core 2 includes a main body 21 and a flange 22 arranged on the outer peripheral edge of the main body 21. The flange 22 is folded toward the side close to the first wall 11 relative to the main body 21. When the air pressure value does not reach the air pressure threshold, the flange 22 abuts against the first wall 11 and surrounds the air leakage hole 111.

[0149] The main body 21 can be a circular sheet structure, a square sheet structure, or a sheet structure of other shapes. The main body 21 and the flange 22 can be formed in one piece, or can be connected by bonding or connecting pieces.

[0150] In this way, when the valve core 2 abuts against the first wall 11 to close the air leakage hole 111, there is a gap between the main body 21 and the first wall 11, so that the force of the valve core 2 on the first wall 11 is applied through the flange 22, so that the flange 22 abuts against the first wall 11 with a greater pressure, thereby improving the sealing of the air leakage hole 111.

[0151] In some embodiments of the present application, the flange 22 is made of elastic material.

[0152] Exemplarily, the material of the flange 22 includes but is not limited to rubber, silicone, polyurethane, etc.

[0153] In this way, when the flange 22 is pressed against the first wall 11 , the flange 22 will deform adaptively along with the shape of the first wall 11 , so that the flange 22 is closely in contact with the first wall 11 , thereby improving the sealing performance of the air leakage hole 111 .

[0154] In some embodiments of the present application, the first wall 11 is further formed with a groove surrounding the air leakage hole 111 , and when the air pressure value does not reach the air pressure threshold, the outer edge of the flange 22 is pressed into the groove.

[0155] By pressing the outer edge of the flange 22 into the groove, the tightness of the valve core 2 closing the air leakage hole 111 is improved.

[0156] In some embodiments of the present application, Figure 6 As shown, the environmental indicator detection device is disposed in the first vent hole 113 .

[0157] For example, Figure 6As shown, the environmental indicator detection device includes a gas concentration detection device 3, which is arranged in the first vent 113. The flow area of ​​the first vent 113 is smaller than the flow area of ​​the first cavity 15, and the gas in the first vent 113 is relatively concentrated. The gas concentration detection device 3 is arranged in the first vent 113, so that the abnormal indicator can be detected more quickly when the gas passes through the gas concentration detection device 3, so that the abnormal signal can be issued in time, and the continued expansion of the thermal runaway can be controlled in time, thereby reducing the degree of out-of-control when the energy storage device has thermal runaway.

[0158] In some embodiments of the present application, Figure 7 As shown, the valve body 1 further has a gas sensing chamber 14 , the gas sensing chamber 14 is connected to the first chamber 15 via a first vent hole 113 , and the environmental indicator detection device is disposed in the gas sensing chamber 14 .

[0159] For example, Figure 7 As shown, the gas concentration detection device 3 is arranged in the gas sensing chamber 14, and the gas in the first chamber 15 enters the gas sensing chamber 14 through the first vent hole 113. The gas sensing chamber 14 can concentrate the gas, so that when the gas passes through the gas concentration detection device 3 in the gas sensing chamber 14, the abnormal index can be detected more quickly, so that the abnormal signal can be sent out in time, and the continued expansion of the thermal runaway can be controlled in time, thereby reducing the degree of out-of-control when the energy storage device has thermal runaway.

[0160] In some embodiments of the present application, Figure 7 As shown, along the axial direction X of the mounting hole 1011 , the flow area of ​​the end of the gas sensing chamber 14 close to the first chamber 15 is greater than the flow area of ​​the end away from the first chamber 15 , and the environmental indicator detection device is arranged at the end of the gas sensing chamber 14 away from the first chamber 15 .

[0161] Specifically, an end of the gas sensing chamber 14 away from the first chamber 15 forms an exhaust port, and the gas in the gas sensing chamber 14 is discharged from the gas sensing chamber 14 through the exhaust port.

[0162] Exemplarily, the gas concentration detection device 3 is disposed at one end of the gas sensing cavity 14 away from the first cavity 15 .

[0163] In this way, the gas is more concentrated when passing through the end of the gas sensing chamber 14 away from the first chamber 15, so that the abnormal index can be detected more quickly when the gas passes through the gas concentration detection device 3, so that the abnormal signal can be issued in time, and the further expansion of the thermal runaway can be controlled in time, thereby reducing the degree of out-of-control when the energy storage device has thermal runaway.

[0164] For example, Figure 7As shown, the gas sensing chamber 14 is in a truncated cone shape, with its large diameter end being close to the first chamber 15 and its small diameter end being far away from the first chamber 15. The exhaust port of the gas sensing chamber 14 is formed at the small diameter end of the gas sensing chamber 14, and the inner wall of the gas sensing chamber 14 is inclined. In this way, the gas sensing chamber 14 guides the gas to its small diameter end, so that the gas is concentrated at the gas concentration detection device 3, so that abnormal indicators can be detected in time.

[0165] In some embodiments of the present application, Figure 6 and Figure 7 As shown, the inner cavity further includes a second cavity 16 , the second wall 12 separates the second cavity 16 and the first cavity 15 , and the signal issuing device 4 is disposed on the outer wall of the valve body 1 corresponding to the second cavity 16 .

[0166] In this way, the gas concentration detection device 3 and the signal issuing device 4 are close to each other, the connection circuit between them is short, and the position distribution is reasonable.

[0167] In some embodiments of the present application, Figure 7 As shown, the gas sensing chamber 14 is disposed in the second chamber 16. The gas in the first chamber 15 enters the gas sensing chamber 14 through the first vent hole 113, and the gas in the gas sensing chamber 14 is discharged into the second chamber 16 through the discharge port, and then the gas is discharged to the outside through the exhaust hole 112.

[0168] In some embodiments of the present application, Figure 6 and Figure 7 As shown, a power supply device 7 for supplying power to the environmental indicator detection device and the signal issuing device 4 is disposed in the second cavity 16 .

[0169] Exemplarily, the output power of the power supply device 7 is 24 V. The power supply device 7 also supplies power to the signal processor 6. It is understandable that all devices in the explosion-proof valve 30 that require electricity are powered by the power supply device 7.

[0170] Exemplarily, a power supply device 7 for supplying power to the gas concentration detection device 3 and the signal issuing device 4 is disposed in the second chamber 16 .

[0171] In this way, the power supply device 7 provides alarm power for the explosion-proof valve 30 and is disposed in the second chamber 16 , which is beneficial to shortening the connection circuit between the power supply device 7 and the gas concentration detection device 3 and the signal issuing device 4 .

[0172] Optionally, a 24V power supply device is configured outside the cabinet 200 of the energy storage device 1000, and the power supply device is used to power the gas concentration detection device 3, the signal issuing device 4 and the signal processor 6. Optionally, the gas concentration detection device 3, the signal issuing device 4 and the signal processor 6 are powered by a power distribution device in the cabinet 200.

[0173] In some embodiments of the present application, Figure 7 As shown, the inner cavity also includes a third cavity 17, and the third cavity 17 and the second cavity 16 are separated by a third wall 13. The third wall 13 is arranged on the side of the second wall 12 facing away from the first wall 11, and the third wall 13 is provided with a second vent hole. The wall surface of the third cavity 17 opposite to the third wall 13 is provided with an exhaust hole 112.

[0174] In this way, the third wall 13 is blocked between the gas concentration detection device 3, the signal sending device 4 and other electrical components and the exhaust hole 112, which is beneficial to reduce the probability of water vapor from outside the battery box 10 entering the third cavity 17 and contacting and adhering to the gas concentration detection device 3, the signal sending device 4 and other electrical components, thereby playing a role in protecting the electrical components.

[0175] In some embodiments of the present application, Figure 6 and Figure 7 As shown, a connecting sleeve 18 is formed at one end of the valve body 1 , the internal channel of the connecting sleeve 18 extends along the axial direction X of the mounting hole 1011 and is connected to the air leakage hole 111 , and the connecting sleeve 18 is penetrated and fixed in the mounting hole 1011 .

[0176] In this way, the gas in the accommodation space can enter the first cavity 15 through the internal channel of the connecting sleeve 18 and the air leakage hole 111 in sequence, thereby realizing the air leakage function. The connecting sleeve 18 is inserted into and fixed to the mounting hole 1011, thereby realizing the installation of the explosion-proof valve 30 on the mounting hole 1011 of the battery box 10, and the connecting sleeve 18 has a simple structure and high connection reliability.

[0177] In some embodiments of the present application, a connecting sleeve 18 is formed at one end of the valve body 1, and the internal channel of the connecting sleeve 18 extends along the axial direction X of the mounting hole 1011 and is connected to the air leakage hole 111. The outer peripheral surface of the connecting sleeve 18 is formed with an external thread, and the inner surface of the mounting hole 1011 is formed with an internal thread, and the external thread of the connecting sleeve 18 is threadedly connected with the internal thread of the mounting hole 1011.

[0178] In this way, the connecting sleeve 18 is directly threadedly fastened to the mounting hole 1011 , so that the connecting structure between the valve body 1 and the battery box 10 is simple and the connection reliability is high.

[0179] In some embodiments of the present application, Figure 6 and Figure 7 As shown, a connecting sleeve 18 is formed at one end of the valve body 1, the internal channel of the connecting sleeve 18 extends along the axial direction X of the mounting hole 1011 and is connected to the air leakage hole 111, and a thread is formed on the outer peripheral surface of the connecting sleeve 18. The connecting sleeve 18 passes through the mounting hole 1011 and is fastened by the threaded sleeve 8.

[0180] In this way, the connecting sleeve 18 passes through the mounting hole 1011 and is fastened by the threaded sleeve 8, thereby realizing the installation of the valve body 1 on the mounting hole 1011 of the battery box 10. The connecting sleeve 18 has a simple structure and high connection reliability.

[0181] In some embodiments of the present application, Figure 6 and Figure 7 As shown, the outer circumference of the connecting sleeve 18 surrounds the limiting groove 181 , and the outer circumference of the connecting sleeve 18 is also sleeved with a sealing ring 19 , which is limited in the limiting groove 181 and abuts against the outer surface of the first box wall.

[0182] In this way, by providing the limiting groove 181 and the sealing ring 19, the sealing performance of the connection between the valve body 1 and the mounting hole 1011 is improved, thereby improving the sealing performance of the accommodating space.

[0183] In some embodiments of the present application, the valve body 1 is formed with a connection hole, and the connection hole is fixed to the first box wall of the battery box 10 by bolts.

[0184] In some embodiments of the present application, Figure 8 As shown, the valve body 1 is provided with more than two exhaust holes 112 which are spaced apart from each other.

[0185] In this way, the gas in the valve body 1 can be quickly discharged through the exhaust hole 112, thereby increasing the speed of exhaust and pressure relief.

[0186] Fig. 9 is a schematic diagram of the structure of an energy storage system according to one or more embodiments.

[0187] like Fig. 9 As shown, an embodiment of the present application provides an energy storage system 2000 , including a power conversion device 3000 and the above-mentioned energy storage device 1000 , wherein the power conversion device 3000 is used to electrically connect a power generation device 4000 and the energy storage device 1000 .

[0188] The power generation device 4000 is used to generate electric energy, and the electric energy generated by the power generation device 4000 can be stored in the energy storage device 1000 through the power conversion device 3000. As an example, the power generation device 4000 can be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device 4000 is not limited in this application.

[0189] Since the energy storage system 2000 includes the above-mentioned energy storage device 1000, the energy storage system 2000 has all the beneficial effects of the energy storage device 1000, and therefore, the energy storage system 2000 can reduce the degree of thermal runaway.

[0190] Fig.10 is a schematic diagram of a charging network according to one or more embodiments.

[0191] like Fig.10 As shown, an embodiment of the present application provides a charging network 6000 , including a charging pile 5000 and the above-mentioned energy storage device 1000 or the above-mentioned energy storage system 2000 , and the energy storage device 1000 is used to provide electrical energy for the charging pile 5000 .

[0192] The charging pile 5000 is electrically connected to the battery device 100 in the energy storage device 1000 through a cable, and the battery device 100 can provide its stored electric energy to the charging pile 5000. The charging pile 5000 has one or more connectors 7000, which are used to connect to an electric device (such as a vehicle) so as to replenish energy to the electric device.

[0193] The energy storage device 1000 may be located inside the charging pile 5000 (eg, an integrated storage and charging device), or may be located outside the charging pile 5000 .

[0194] Since the charging network 6000 includes the above-mentioned energy storage device 1000 or the above-mentioned energy storage system 2000, the charging network 6000 has all the beneficial effects of the energy storage device 1000 or the energy storage system 2000. Therefore, the charging network 6000 can reduce the degree of thermal runaway.

[0195] Specific examples of some embodiments of the present application are described below with reference to the accompanying drawings.

[0196] As a specific example, an energy storage container (energy storage device 1000) is provided, including an energy storage box (cabinet 200) and at least one electric box (battery device 100) arranged in the energy storage box, the electric box includes a box shell (battery box 10), at least one battery cell (battery cell 20) and an explosion-proof valve (explosion-proof valve 30) arranged on a wall plate of the box shell, the explosion-proof valve includes a valve body (valve body 1), the valve body is provided with an air leakage hole (air leakage hole 111), and the valve body is provided with a spring (elastic member 5) and a piston (valve core 2) connected to the spring. When the electric box is not abnormal, the elastic force of the spring drives the piston to press against the wall of the valve body provided with the air leakage hole, closes the air leakage hole, and isolates the space in the box shell from the environment outside the box shell; when the electric box is abnormal, the air pressure in the box shell increases, drives the piston away from the air leakage hole, opens the air leakage hole, and discharges the gas in the box shell through the air leakage hole.

[0197] The explosion-proof valve also includes an electrochemical sensor, a signal processor and an LED light connected in sequence. The electrochemical sensor and the signal processor are arranged in the valve body, and the LED light is arranged on the outer wall of the valve body. The gas enters the valve body and passes through the electrochemical sensor. The electrochemical sensor undergoes an electrochemical reaction and outputs an electrical signal. The signal processor converts the electrical signal into a digital signal, which is transmitted to the LED light. The LED light emits light to realize real-time alarm.

[0198] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 specification of the present application. Unless otherwise specified, the various technical features mentioned in the embodiments can be combined in any way to form a new technical solution. Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

Claims

1. An energy storage device, characterized in that: comprising at least one battery device, The battery device comprises: A battery box has a storage space, and a first box wall of the battery box is provided with a mounting hole; At least one battery cell is disposed in the accommodation space; An explosion-proof valve, comprising a valve body, the valve body having an inner cavity and an air leakage hole provided in the inner cavity, the air leakage hole being configured to be closed or opened to close the accommodation space or to allow the accommodation space to communicate with the external environment of the battery box through the explosion-proof valve; The explosion-proof valve also includes an environmental indicator detection device and a signal issuing device. The environmental indicator detection device is arranged in the inner cavity and is used to detect the environmental indicator in the inner cavity. The signal issuing device is used to issue an abnormal signal when the environmental indicator reaches a set condition.

2. The energy storage device according to claim 1, characterized in that: The explosion-proof valve also includes a valve core, which is arranged in the inner cavity. The valve core is configured to open the air leakage hole when the air pressure value in the accommodating space reaches an air pressure threshold, and to close the air leakage hole when the air pressure value does not reach the air pressure threshold.

3. The energy storage device according to claim 1, characterized in that: The environmental index includes a gas concentration value, and the setting condition includes a gas concentration threshold value. The environmental indicator detection device comprises a gas concentration detection device, and the gas concentration detection device is used to detect the gas concentration value of the gas in the inner cavity.

4. The energy storage device according to claim 1, characterized in that: The signal emitting device includes a sound emitting device and / or a light emitting device.

5. The energy storage device according to claim 2, characterized in that: The explosion-proof valve also includes an elastic member, one end of which is connected to the valve body, and the other end is connected to the valve core. When the air pressure value in the accommodating space does not reach the air pressure threshold, the valve core closes the air leakage hole under the elastic force of the elastic member. When the air pressure value reaches the air pressure threshold, the valve core moves away from the air leakage hole under the action of the air pressure to open the air leakage hole.

6. The energy storage device according to claim 5, characterized in that: The inner cavity includes a first cavity, which is defined between a first wall and a second wall which are opposite to each other along the axial direction of the mounting hole, the air leakage hole is formed in the first wall, and a first air vent is formed in the second wall. The elastic member and the valve core are both arranged in the first cavity, one end of the elastic member is connected to the second wall, and the other end extends toward the first wall and is connected to the valve core.

7. The energy storage device according to claim 6, characterized in that: The valve core includes a main body and a flange arranged on the outer peripheral edge of the main body, and the flange is folded toward a side close to the first wall relative to the main body. When the air pressure value does not reach the air pressure threshold, the flange abuts against the first wall and surrounds the air leakage hole.

8. The energy storage device according to claim 7, characterized in that: The flange is made of elastic material.

9. The energy storage device according to claim 7, characterized in that: The first wall is further formed with a groove surrounding the air leakage hole, and when the air pressure value does not reach the air pressure threshold, the outer edge of the flange is pressed into the groove.

10. The energy storage device according to claim 6, characterized in that: The environmental indicator detection device is arranged in the first vent hole.

11. The energy storage device according to claim 6, characterized in that: The valve body further comprises a gas sensing cavity, the gas sensing cavity is communicated with the first cavity through the first vent hole, and the environmental indicator detection device is arranged in the gas sensing cavity.

12. The energy storage device according to claim 11, characterized in that: Along the axial direction of the mounting hole, the flow area of ​​the end of the gas sensing cavity close to the first cavity is larger than the flow area of ​​the end away from the first cavity, and the environmental indicator detection device is arranged at the end of the gas sensing cavity away from the first cavity.

13. The energy storage device according to claim 6, characterized in that: The inner cavity further includes a second cavity, the second wall is separated between the second cavity and the first cavity, and the signal emitting device is arranged on the outer wall of the valve body corresponding to the second cavity.

14. The energy storage device according to claim 13, characterized in that: A power supply device for supplying power to the environmental indicator detection device and the signal emitting device is arranged in the second cavity.

15. The energy storage device according to claim 13, characterized in that: The inner cavity further comprises a third cavity, the third cavity and the second cavity are separated by a third wall, the third wall is arranged on the side of the second wall facing away from the first wall, and the wall surface of the third cavity opposite to the third wall is provided with an exhaust hole.

16. The energy storage device according to any one of claims 1 to 15, characterized in that: A connecting sleeve is formed at one end of the valve body, an internal passage of the connecting sleeve extends along the axial direction of the mounting hole and is connected with the air leakage hole, and the connecting sleeve is penetrated and fixed in the mounting hole.

17. The energy storage device according to claim 16, characterized in that: The outer peripheral surface of the connecting sleeve is formed with threads, and the connecting sleeve passes through the mounting hole and is fastened by the threaded sleeve.

18. The energy storage device according to claim 16, characterized in that: An external thread is formed on the outer peripheral surface of the connecting sleeve, and an internal thread is formed on the inner surface of the mounting hole. The external thread of the connecting sleeve is threadably connected with the internal thread of the mounting hole.

19. The energy storage device according to claim 16, characterized in that: The outer circumference of the connecting sleeve surrounds the limiting groove, and a sealing ring is also sleeved on the outer circumference of the connecting sleeve. The sealing ring is limited in the limiting groove and abuts against the outer surface of the first box wall.

20. An energy storage system, characterized in that: It comprises a power conversion device and an energy storage device as claimed in any one of claims 1 to 19, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

21. A charging network, characterized in that: It comprises a charging pile and an energy storage device as described in any one of claims 1 to 19 or an energy storage system as described in claim 20, wherein the energy storage device is used to provide electrical energy for the charging pile.

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