Energy storage device and gas concentration measurement method therefor

Abstract

An energy storage device and a gas concentration measurement method therefor. The device comprises at least two energy storage units, a pipe assembly and a gas detection assembly, wherein the pipe assembly comprises a main pipe, at least two branch pipes and at least two switching valves; each branch pipe is in communication with the interior of one energy storage unit and the main pipe; each switching valve is disposed on one branch pipe and is configured to open or close the corresponding branch pipe; and the gas detection assembly is in communication with the main pipe and is configured to acquire from the main pipe gas that comes from the interior of at least one energy storage unit and to measure the concentration of the acquired gas.

Description

Energy storage device and gas concentration detection method thereof

[0001] This application claims priority to Chinese patent application No. 2023110934736, filed on August 29, 2023, entitled “Energy Storage Device and Method for Detecting Gas Concentration Thereof,” the entire contents of which are incorporated herein by reference.

Technical field

[0002] The present application relates to the technical field of energy storage devices, and in particular to an energy storage device and a method for detecting gas concentration thereof. [Background Technology]

[0003] With the development of energy storage technology, energy storage devices composed of energy storage elements can achieve functions such as energy storage, release, and rapid power exchange. Therefore, energy storage devices are widely used in the automotive, home appliance, aerospace and other fields. Common energy storage devices include batteries, renewable fuel cells, flow batteries, supercapacitors, etc.

[0004] Because energy storage devices can experience thermal runaway and other conditions during use, generating large amounts of gas and even posing the risk of explosion, common energy storage elements are often equipped with gas sensors. However, the placement of gas sensors within energy storage devices presents numerous problems. For example, energy storage devices typically contain multiple energy storage elements. In existing energy storage device structures, each element is typically equipped with one or more gas sensors to detect the internal gas conditions of each element. However, this can make the production cost of the energy storage device excessively high.

[0005] [Summary of the invention]

[0006] In view of the above problems, the present application provides an energy storage device and a method for detecting gas concentration thereof, which can save gas detection components, effectively detect the gas inside each energy storage unit and improve detection accuracy, while reducing the cost of the energy storage device.

[0007] In a first aspect, the present application provides an energy storage device comprising at least two energy storage units, a piping assembly, and a gas detection assembly. The piping assembly comprises a main pipe, at least two branch pipes, and at least two switch valves. Each branch pipe connects the interior of an energy storage unit to the main pipe. Each switch valve is provided on a branch pipe and is configured to open or close the corresponding branch pipe. The gas detection assembly is connected to the main pipe and is configured to obtain gas from the interior of at least one of the energy storage units through the main pipe and detect the concentration of the obtained gas.

[0008] In the technical solution of the embodiments of the present application, a single gas detection assembly is configured to detect at least two energy storage units. This design allows the gas detection assembly to effectively detect the gas within each energy storage unit while also reducing the number of gas detection assemblies, lowering the cost of the energy storage device and improving the internal space utilization of the energy storage device. Corresponding branch pipes and on-off valves are provided between the gas detection assembly and each energy storage element. These branch pipes and on-off valves are used to separate the gas within each energy storage element, allowing the gas detection assembly to detect the gas within each energy storage unit, thereby improving the detection accuracy of the gas detection assembly.

[0009] In some embodiments, at least two energy storage units are spaced apart along a preset direction, at least two branch pipes are spaced apart along the preset direction, and the main pipe extends along the preset direction and is located on the same side of the at least two energy storage units.

[0010] The above arrangement allows the at least two energy storage units to be neatly arranged, thereby improving the internal space utilization of the energy storage device. Furthermore, by arranging the at least two branch pipes in a predetermined direction with the main pipe located on the same side of the two energy storage units, it is easier to arrange and connect the two branch pipes to the main pipe, facilitating the gas detection assembly to detect gas within the at least two energy storage units via the at least two branch pipes and the main pipe.

[0011] In some embodiments, a predetermined side of each energy storage unit is provided with an air extraction hole, which communicates with the interior of the energy storage unit. Each branch pipe includes a first pipe segment and a second pipe segment connected in a zigzag manner. The first pipe segment communicates with the second pipe segment, which in turn communicates with the air extraction hole, and the second pipe segment communicates with the main pipe segment. The main pipe segment extends parallel to the predetermined sides of at least two energy storage devices, the second pipe segment extends parallel to the predetermined sides, and the first pipe segment extends at an angle to the predetermined sides.

[0012] Through the above-mentioned arrangement, the line layout of each branch pipe and main pipe can be made simple and neat. The bending arrangement of the branch pipe can reduce the arrangement distance between the main pipe and the predetermined side, effectively saving space, so that the gas detection component can quickly obtain and detect the gas inside each energy storage unit through each branch pipe and main pipe, and can also save the amount of pipelines, thereby reducing the cost of the energy storage device.

[0013] In some embodiments, the extension length of the second tube segment is greater than the extension length of the first tube segment, and / or the extension direction of the first tube segment is perpendicular to the predetermined side.

[0014] The above arrangement can facilitate the connection between the second pipe segment and the first pipe segment, and can reduce the length of the energy storage device in the extension direction of the first pipe segment, thereby improving the space utilization of the energy storage device.

[0015] In some embodiments, each energy storage unit includes a mounting shell and a storage assembly, wherein the storage assembly is disposed within the mounting shell. An air extraction hole is provided in the mounting shell. The first pipe section is fixedly connected to the mounting shell and is sealed therewith.

[0016] By sealing the first pipe section with the mounting shell, leakage of gas, liquid, etc. inside the mounting shell from the exhaust hole can be reduced, thereby improving the reliability of the energy storage device. Moreover, when the gas detection component extracts the gas inside the mounting shell of each energy storage unit through the exhaust hole, the extracted gas is less likely to leak, thereby improving the detection accuracy of the gas detection component.

[0017] In some embodiments, the mounting shell is further provided with an annular sealing groove surrounding the air extraction hole, and the first pipe section is inserted into the annular sealing groove and sealedly connected to the groove wall of the annular sealing groove.

[0018] By inserting the first pipe section into the annular sealing groove, the sealing setting of the air extraction hole can be further strengthened, so that the gas inside the energy storage unit is not easily leaked out of the installation shell through the air extraction hole, thereby enhancing the airtightness of the energy storage unit.

[0019] In some embodiments, a gas detection assembly includes a cavity body and at least one gas sensor. The cavity body defines a gas detection cavity and a through hole communicating with the gas detection cavity. A main pipe communicates with the gas detection cavity through the through hole. The at least one gas sensor is disposed within the gas detection cavity and is configured to detect gas within the gas detection cavity.

[0020] Through the above arrangement, the at least one gas sensor disposed in the gas detection chamber can conveniently detect the gas extracted into the gas detection chamber.

[0021] In some embodiments, the energy storage device includes a housing, at least two energy storage units disposed within the housing, at least two branch pipes and at least two on / off valves disposed within the housing. The housing defines a mounting hole, into which the main pipe extends. The cavity is fixedly disposed outside the housing, with the through hole communicating with the mounting hole.

[0022] By setting a mounting hole in the containment shell, the main pipe can be extended to the mounting hole and connected to the cavity, and the position of the main pipe can be further fixed, so that the main pipe is not easily displaced and disconnected from the cavity, thereby improving the structural tightness of the energy storage device.

[0023] In some embodiments, at least a portion of the cavity is disposed in the mounting hole and is sealed to a wall of the mounting hole.

[0024] Through the above-mentioned arrangement, the containing shell of the energy storage unit and the gas detection assembly can be relatively fixed, thereby increasing the stability of the energy storage device. Moreover, the cavity is sealed with the hole wall of the mounting hole, which can also prevent the gas in the cavity and the main pipe from leaking from the hole wall of the mounting hole, thereby improving the structural tightness of the energy storage device and the accuracy of the gas detection assembly.

[0025] In some embodiments, the mounting hole includes a first hole segment and a second hole segment. The second hole segment has a larger diameter than the first hole segment, forming a first step surface in the containment shell at the junction of the first and second hole segments. The second hole segment is further away from the interior of the containment shell than the first hole segment. At least a portion of the cavity is inserted into the second hole segment and is sealed to the wall of the second hole segment. The through hole is disposed opposite the first hole segment and is in communication with each other.

[0026] By arranging the first hole section and the second hole section in a stepped arrangement, it is convenient to fix the position of at least part of the cavity, and it is also convenient to insert at least part of the cavity into the second hole section and seal it with the second hole section, thereby making the connection structure between the cavity and the containment shell tighter.

[0027] In some embodiments, the cavity includes a main cavity portion and an insertion portion connected to each other, and the gas detection cavity is disposed in the main cavity portion and the insertion portion. A second step surface is formed at the junction of the main cavity portion and the insertion portion. The through hole is disposed on a side of the insertion portion away from the main cavity portion. The insertion portion is inserted into the second hole segment and is sealed to the hole wall of the second hole segment. The second step surface abuts the outer area of ​​the second hole segment.

[0028] By setting the connection part between the cavity and the mounting hole to be stepped, the main cavity part and the insertion part of the cavity can correspond to the mounting hole, thereby facilitating the installation of the cavity to the mounting hole. The connection structure between the cavity and the containing shell can also be made tighter, so that the gas in the cavity and the main pipe is not easily leaked from the connection part between the mounting hole and the cavity.

[0029] In some embodiments, the insertion portion abuts against the first step surface. The diameter of the through hole is larger than the diameter of the first hole section, and the through hole surrounds the first hole end.

[0030] By setting the aperture of the through hole to be larger than the aperture of the first hole section, the gas in the main pipe can be easily transported into the cavity through the mounting hole, and the gas will not be obstructed when passing through the mounting hole from the main pipe, thereby facilitating the gas detection component to detect the gas inside the energy storage unit and improving the detection efficiency.

[0031] In some embodiments, the second step surface is sealingly connected to a peripheral area of ​​the second hole segment.

[0032] Through the above arrangement, the gas in the cavity and the main pipe is unlikely to leak from the connection portion between the mounting hole and the cavity.

[0033] In some embodiments, the cavity further defines an exhaust hole connected to the gas detection cavity, the exhaust hole is provided with a first exhaust valve, and the first exhaust valve is used to open or close the exhaust hole. The exhaust hole is used to discharge gas in the gas detection cavity.

[0034] Through the above arrangement, the detected gas can be discharged in time, so that the detected gas is less likely to affect subsequent gas detection.

[0035] In some embodiments, the energy storage device includes a control circuit board disposed within the housing and electrically connected to at least two on / off valves and at least one gas sensor. The control circuit board is configured to control the opening or closing of each on / off valve and to obtain detection signals from the at least one gas sensor.

[0036] By setting up a control circuit board to control the opening or closing of each switch valve, the gas detection component can individually locate and detect each energy storage unit, monitor each energy storage unit, and improve the accuracy of the gas detection component.

[0037] In some embodiments, the control circuit board is disposed outside the housing, a housing hole is formed on the control circuit board, and the cavity passes through the housing hole.

[0038] By setting the cavity in the receiving hole of the control circuit board, the control circuit board and the cavity can be relatively fixed, the space utilization of the energy storage device can be improved, the distance between the control circuit board and the gas sensor can be reduced, and the electrical connection between the control circuit board and the switch valve and the gas sensor can be facilitated.

[0039] In some embodiments, the cavity is provided with a lead hole communicating with the gas detection cavity, and a wire of at least one gas sensor can be led out of the cavity through the lead hole and connected to the control circuit board.

[0040] The above arrangement facilitates electrical connection between the control circuit board and the gas sensor, thereby facilitating the gas sensor to transmit relevant gas information to the control circuit board.

[0041] In some embodiments, the control circuit board is disposed outside the containment housing. The cavity is fixedly disposed on a side of the control circuit board facing the containment housing. The control circuit board is provided with connecting pins. The connecting pins extend through the cavity and connect to at least one gas sensor within the gas detection chamber.

[0042] By arranging the control circuit board outside the containment shell, the gas or liquid in the energy storage device is not easily corroded by the control circuit board, and it is also convenient to install the control circuit board on the containment shell, and to connect the control circuit board to at least one gas sensor through connecting pins.

[0043] In some embodiments, the control circuit board is used to calculate the corresponding concentration based on the detection signal, determine a frequency adjustment strategy that matches the concentration, and adjust the switching frequency of the corresponding switching valve according to the frequency adjustment strategy.

[0044] Through the above settings, it is possible to implement a detection strategy that adjusts in real time according to the gas conditions inside the energy storage device, thereby enabling more effective detection and monitoring of the conditions inside the energy storage device, and enabling early prediction of thermal runaway conditions in the energy storage device.

[0045] In some embodiments, the pipeline assembly includes an air pump, which is disposed in the main pipe and is used to pump the gas entering the main pipe to the gas detection assembly.

[0046] By arranging an air pump to pump the gas in the main pipe to the gas detection component, the gas in the main pipe can smoothly enter the gas detection component to be detected by the gas detection component, and the detection speed and efficiency of the gas detection component can also be improved.

[0047] The at least one gas sensor includes at least one of a hydrogen sensor, a carbon dioxide sensor, a carbon monoxide sensor, and a methane sensor.

[0048] By configuring the at least one gas sensor to include multiple gas sensors, the gas detection component can detect multiple gases in the energy storage unit, thereby more effectively monitoring the situation in each energy storage unit.

[0049] In some embodiments, the energy storage unit is a battery cell. Alternatively, the energy storage unit is a battery, and each energy storage unit includes a plurality of battery cells.

[0050] The above configuration allows the energy storage device to monitor the internal conditions of the battery or battery cells in real time through the gas detection assembly, enabling timely detection of thermal runaway and other conditions in the battery or battery cells, allowing for subsequent protective measures to be implemented for the battery or battery cells, thereby extending the lifespan of the battery cells and battery cells. Furthermore, providing a single gas detection assembly to monitor the internal conditions of multiple battery cells can reduce battery manufacturing costs.

[0051] In some embodiments, the pipeline assembly further includes an exhaust branch pipe and a second exhaust valve, wherein the exhaust branch pipe is connected to the main pipe and is used to discharge gas in the main pipe out of the pipeline assembly or the energy storage device. The second exhaust valve is provided on the exhaust branch pipe and is used to open or close the exhaust branch pipe.

[0052] Through the above arrangement, the gas in the main pipe can be discharged in a convenient and timely manner, so that the detected gas is less likely to affect subsequent gas detection.

[0053] In a second aspect, the present application provides a method for detecting the gas concentration of the energy storage device in the above embodiment, the method comprising:

[0054] Controlling the opening of at least one switch valve so that the gas inside the corresponding energy storage unit flows into the main pipe through the corresponding branch pipe;

[0055] The concentration of the gas obtained from the main pipe is detected by the gas detection component to obtain the concentration.

[0056] By controlling the opening of at least one switch valve to obtain the concentration of the corresponding energy storage unit, detection of a single energy storage unit can be achieved, thereby improving the detection specificity and accuracy of the gas detection component.

[0057] In some embodiments, after the gas concentration is detected by the gas detection component and the gas concentration is obtained, the method includes:

[0058] Determine frequency regulation strategy to match concentration;

[0059] Adjust the switching frequency of the corresponding switching valve according to the frequency regulation strategy.

[0060] Through the above settings, it is possible to implement a detection strategy that adjusts in real time according to the gas conditions inside the energy storage device, thereby enabling more effective detection and monitoring of the conditions inside the energy storage device, and enabling early prediction of thermal runaway conditions in the energy storage device.

[0061] In some embodiments, determining a frequency adjustment strategy for concentration includes:

[0062] comparing the concentration to a preset concentration threshold;

[0063] If the concentration is greater than the preset concentration threshold, the frequency adjustment strategy is set to increase the switching frequency of the corresponding switching valve.

[0064] By comparing the concentration with a preset concentration threshold, and when the concentration is greater than the preset concentration threshold, the detection frequency can be increased by increasing the switching frequency of the corresponding switching valve, so that the situation inside the energy storage unit can be monitored more timely, thereby increasing the sensitivity and accuracy of the gas detection component in detecting the inside of the energy storage unit, and can also detect thermal runaway of the energy storage device in a timely manner, so as to facilitate subsequent corresponding protection measures for the energy storage device, thereby improving the life of the energy storage device.

[0065] In some embodiments, after controlling the opening of at least one switching valve, the method further includes:

[0066] The gas pump on the control main pipe is used to pump the gas on the branch pipe to the gas detection component through the main pipe.

[0067] By arranging an air pump to pump the gas in the main pipe to the gas detection assembly, the gas in the main pipe can smoothly enter the gas detection assembly to be detected by the gas detection assembly, and the detection speed and efficiency of the gas detection assembly can also be accelerated.

[0068] In some embodiments, controlling the opening of at least one switching valve includes:

[0069] Opening a switch valve during each detection period to allow the gas inside the corresponding energy storage unit to flow into the main pipe in sequence;

[0070] The concentration of the gas obtained from the main pipe is detected by the gas detection component to obtain the concentration, including:

[0071] In each detection period, the concentration of the gas inside the corresponding energy storage unit obtained from the main pipe is detected by the gas detection component to obtain the concentration.

[0072] Through the above arrangement, the gas detection component can detect each energy storage unit individually, so that the gases between the energy storage units are less likely to interfere with each other, thereby improving the specificity and accuracy of detection.

[0073] In some embodiments, after the concentration of the gas obtained from the main pipe is detected by the gas detection component to obtain the concentration, the method includes:

[0074] The gas in the main pipe and the gas detection assembly is discharged to the outside, and the control of opening at least one switch valve is returned to enable the next detection.

[0075] Through the above arrangement, the detected gas in the main pipe and the gas detection component can be discharged in time, so that the detected gas is less likely to affect subsequent gas detection.

[0076] 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

[0077] 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 numerals are used throughout the drawings to represent the same components. In the drawings:

[0078] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0079] FIG2 is a schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0080] FIG3 is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0081] FIG4 is a schematic diagram of the exploded structure of an energy storage device according to some embodiments of the present application;

[0082] FIG5 is a schematic block diagram of the connection structure of the energy storage device according to some embodiments of the present application;

[0083] FIG6 is a schematic diagram of the exploded structure of an energy storage unit according to some embodiments of the present application;

[0084] FIG7 is a cross-sectional schematic diagram of a gas detection assembly according to some embodiments of the present application;

[0085] FIG8 is an isometric enlarged schematic diagram of the P region of the energy storage device embodiment shown in FIG4 ;

[0086] FIG9 is a schematic flow chart of the steps of a method for detecting gas concentration in an energy storage device according to some embodiments of the present application.

[0087] The reference numerals in the specific embodiment are as follows: vehicle 1000a; battery 100a; housing 10a, first portion 11a, second portion 12a; battery cell 1, housing 100, end cap 120, housing 110, electrode terminal 121, opening 111, electrode assembly 200, tab 201; energy storage device 300, energy storage unit 310, pipeline assembly 320, gas detection assembly 330, predetermined side 3101, gas extraction hole 311, Mounting shell 312, storage component 313, annular sealing groove 3121, main pipe 321, branch pipe 322, switch valve 323, first pipe section 3221, second pipe section 3222, air pump 324, exhaust branch pipe 325, second exhaust valve 326, cavity 331, gas sensor 332, gas detection cavity 3311, through hole 3312, main cavity part 3313, insertion part 3314, second step surface 3315, exhaust hole 3316, first exhaust valve 3317, lead hole 3318, accommodating shell 340, mounting hole 341, first hole section 3411, second hole section 3412, first step surface 3413, control circuit board 350, processor 351, accommodating hole 352, connecting pin 353. [Specific implementation method]

[0088] 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.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0090] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0091] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0092] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0093] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0094] 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., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0095] 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; 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.

[0096] With the development of energy storage technology, energy storage devices composed of energy storage elements can achieve functions such as energy storage, release, and rapid power exchange. Therefore, energy storage devices are widely used in the automotive, home appliance, aerospace and other fields. Common energy storage devices include batteries, renewable fuel cells, flow batteries, supercapacitors, etc.

[0097] Because energy storage devices can experience thermal runaway and other conditions during use, generating large amounts of gas and even posing the risk of explosion, common energy storage elements are often equipped with gas sensors. However, the placement of gas sensors within energy storage devices presents numerous problems. For example, energy storage devices typically contain multiple energy storage elements. In existing energy storage device structures, each element is typically equipped with one or more gas sensors to detect the internal gas conditions of each element. However, this can make the production cost of the energy storage device excessively high.

[0098] For example, a battery is equipped with multiple battery cells. In the existing battery structure, each battery cell is usually equipped with a gas sensor to detect the internal gas condition of each battery cell, but this makes the battery manufacturing cost too high.

[0099] To reduce the cost of the energy storage device, the gas inside multiple energy storage elements can be introduced into the same gas detection assembly, allowing a single gas detection assembly to detect multiple energy storage elements. This reduces costs while also improving the internal space utilization of the energy storage device. Furthermore, a gas detection assembly can be individually connected to each energy storage element, isolating the gas inside each energy storage element from each other, allowing the gas detection assembly to detect the gas in each energy storage unit in real time.

[0100] Based on the above considerations, the present application provides an energy storage device and a method for detecting the gas concentration of the energy storage device. The energy storage device includes at least two energy storage units, a pipeline assembly, and a gas detection assembly. The pipeline assembly includes a main pipe, at least two branch pipes, and at least two switch valves. Each branch pipe connects the interior of an energy storage unit and the main pipe. Each switch valve is provided on a branch pipe and is used to open or close the corresponding branch pipe. The gas detection assembly is connected to the main pipe and is used to obtain gas from the interior of at least one of the energy storage units from the main pipe and detect the concentration of the obtained gas.

[0101] By configuring the same gas detection assembly to detect at least two energy storage units, this design allows the gas detection assembly to detect the internal conditions of each energy storage unit in real time. This also reduces the number of gas detection assemblies, lowers the cost of the energy storage device, simplifies the manufacturing process of the energy storage device, and improves the internal space utilization of the energy storage device. A switching valve is provided between the gas detection assembly and each energy storage element to separate the gas inside each energy storage element, allowing the gas detection assembly to detect the gas in each energy storage unit in real time.

[0102] The following is an exemplary description of the energy storage device according to an embodiment of the energy storage device.

[0103] An energy storage device is a device that can store energy within the device through physical or chemical media, and under appropriate conditions, can also release energy out of the device in the form of electrical energy, thermal energy, etc., thereby realizing functions such as energy storage, release, or rapid power exchange.

[0104] For example, energy storage devices may include energy storage containers, energy storage cabinets, energy storage stations, power banks, batteries and other equipment.

[0105] For the convenience of description, the following embodiments are described by taking the energy storage device of one embodiment of the present application as a battery as an example.

[0106] The energy storage device disclosed in the embodiments of the present application may be an electrical device using a battery as a power source or various energy storage systems using a battery as an energy storage element.

[0107] Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0108] For the convenience of description, the following embodiments are described by taking a vehicle 1000a as an example of an electrical device according to an embodiment of the present application.

[0109] Referring to Figure 1, vehicle 1000a can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100a is provided inside vehicle 1000a. Battery 100a can be provided at the bottom, head, or tail of vehicle 1000a. Battery 100a can be used to power vehicle 1000a. For example, battery 100a can serve as an operating power source for vehicle 1000a. Vehicle 1000a can also include a controller 200a and a motor 300a. Controller 200a is used to control battery 100a to power motor 300a, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000a.

[0110] In some embodiments of the present application, the battery 100a can serve not only as an operating power source for the vehicle 1000a, but also as a driving power source for the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0111] In some embodiments, the battery 100a may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0112] The battery 100 a mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

[0113] In the embodiment of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after discharge and continue to be used. Each battery cell 1 may also be a primary battery.

[0114] The battery cell 1 includes, but is not limited to, 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The battery cell 1 may be cylindrical, flat, rectangular, or have other shapes.

[0115] In some embodiments, the battery 100 a may be a battery module. When there are multiple battery cells 1 , the multiple battery cells 1 are arranged and fixed to form a battery module.

[0116] In some embodiments, referring to FIG. 2 , the battery 100 a may be a battery pack, which includes a housing 10 a and battery cells 1 . The battery cells 1 or battery modules are housed in the housing 10 a .

[0117] In some embodiments, the box 10a can serve as part of the chassis structure of the vehicle 1000a. For example, a portion of the box 10a can become at least a portion of the floor of the vehicle 1000a, or a portion of the box 10a can become at least a portion of the cross member and longitudinal member of the vehicle 1000a.

[0118] Referring to Figure 2, the battery 100a includes a housing 10a and a battery cell 1, and the battery cell 1 is accommodated in the housing 10a. The housing 10a is used to provide a storage space for the battery cell 1, and the housing 10a can adopt a variety of structures. In some embodiments, the housing 10a can include a first portion 11a and a second portion 12a, and the first portion 11a and the second portion 12a cover each other, and the first portion 11a and the second portion 12a jointly define a storage space for accommodating the battery cell 1. The second portion 12a can be a hollow structure with one end open, and the first portion 11a can be a plate-like structure, and the first portion 11a covers the open side of the second portion 12a, so that the first portion 11a and the second portion 12a jointly define a storage space; the first portion 11a and the second portion 12a can also be hollow structures with one side open, and the open side of the first portion 11a covers the open side of the second portion 12a. Of course, the box body 10a formed by the first part 11a and the second part 12a can be in various shapes, such as a cylinder, a cuboid, etc.

[0119] In the battery 100a, there may be multiple battery cells 1, and the multiple battery cells 1 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that the multiple battery cells 1 are both connected in series and in parallel. The multiple battery cells 1 may be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by the multiple battery cells 1 is accommodated in the housing 10a. Of course, the battery 100a may also be in the form of a battery module in which multiple battery cells 1 are first connected in series, in parallel, or in a hybrid connection, and the multiple battery modules are then connected in series, in parallel, or in a hybrid connection to form a whole and accommodated in the housing 10a. The battery 100a may also include other structures. For example, the battery 100a may also include a busbar component for achieving electrical connection between the multiple battery cells 1.

[0120] Referring to Figure 3 , a battery cell 1 is the smallest unit of a battery. In this embodiment, a cylindrical battery cell 1 is used as an example. As shown in Figure 3 , the battery cell 1 includes a housing 100 , an electrode assembly 200 , and other functional components.

[0121] In some embodiments, the housing 100 is used to encapsulate the electrode assembly 200 and the electrolyte and other components. The housing 100 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0122] The outer shell 100 may include an end cap 120 and a shell 110. The end cap 120 refers to a component that covers the opening of the shell 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 120 can be adapted to the shape of the shell 110 to match the shell 110. Optionally, the end cap 120 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 120 is not easily deformed when squeezed or collided, so that the battery cell 1 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals 121 can be provided on the end cap 120. The electrode terminal 121 can be used to electrically connect to the electrode assembly 200 for outputting or inputting electrical energy of the battery cell 1. In some embodiments, the end cap 120 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The end cap 120 may be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating component may be disposed inside the end cap 120 to isolate the electrical connection components within the housing 110 from the end cap 120 to reduce the risk of short circuits. Exemplary materials include plastic, rubber, and the like.

[0123] The housing 110 is a component that cooperates with the end cap 120 to form the internal environment of the battery cell 1. This internal environment can be used to accommodate the electrode assembly 200, electrolyte, and other components. The housing 110 and end cap 120 can be separate components. An opening 111 can be provided in the housing 110, and the end cap 120 is placed over the opening 111 to form the internal environment of the battery cell 1. Alternatively, the end cap 120 and housing 110 can be integrated. Specifically, the end cap 120 and housing 110 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 110 is to be enclosed, the end cap 120 is placed over the housing 110. The housing 110 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 110 can be determined based on the specific shape and size of the electrode assembly 200. The housing 110 can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0124] The electrode assembly 200 is a component where electrochemical reactions occur in the battery cell 1. One or more electrode assemblies 200 may be contained in the housing 110.

[0125] In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0126] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0127] 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 provided on either or both of the two facing surfaces of the positive electrode current collector.

[0128] 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 with a silver surface treatment, 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.).

[0129] 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. 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. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2) and at least one of their modified compounds.

[0130] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0131] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can 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.).

[0132] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0133] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0134] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0135] 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.

[0136] In some embodiments, the electrode assembly 200 further includes a separator disposed between the positive electrode and the negative electrode.

[0137] 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 and mechanical stability can be selected.

[0138] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0139] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0140] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0141] The liquid electrolyte includes an electrolyte salt and a solvent.

[0142] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0143] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0144] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0145] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0146] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0147] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0148] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0149] In some embodiments, the electrode assembly 200 is a wound structure in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0150] In some embodiments, the electrode assembly 200 is provided with tabs 201 that conduct current from the electrode assembly 200. Tabs include positive and negative tabs. The positive and negative tabs can be located together at one end of the main body or separately at opposite ends. During the charge and discharge process of the battery 100a, the positive and negative active materials react with the electrolyte, and the tabs 201 connect to the electrode terminals to form a current circuit.

[0151] According to some embodiments of the present application, as shown in FIG. 4 and FIG. 5 , the energy storage device 300 may include at least two energy storage units 310 , a pipeline assembly 320 and a gas detection assembly 330 .

[0152] The at least two energy storage units 310 are energy storage elements in the energy storage device 300, capable of storing, releasing, or rapidly exchanging energy. For example, the energy storage unit 310 may be a battery 100a, a battery cell 1, or other such unit.

[0153] The pipeline assembly 320 is used to connect at least two energy storage units 310 and the gas detection assembly 330 , and can transport the gas inside at least one energy storage unit 310 to the gas detection assembly 330 .

[0154] Optionally, the pipeline assembly 320 may include a main pipe 321, at least two branch pipes 322, and at least two switch valves 323. Each branch pipe 322 connects the interior of an energy storage unit 310 and the main pipe 321. Each switch valve 323 may be provided on a branch pipe 322 to open or close the corresponding branch pipe 322.

[0155] The gas detection component 330 may be in communication with the main pipe 321 , and may be configured to obtain gas from the interior of at least one of the energy storage units 310 through the main pipe 321 , and to detect the concentration of the obtained gas.

[0156] By using the same gas detection component 330 to detect at least two energy storage units 310, the gas detection component 330 can effectively detect the internal gas concentration of each energy storage unit. At the same time, it can also reduce the number of gas detection components 330, reduce the cost of the energy storage device 300, and improve the internal space utilization of the energy storage device 300.

[0157] A branch pipe 322 and a switch valve 323 are set between the gas detection component 330 and each energy storage unit 310. The branch pipe 322 and the switch valve 323 can be used to separate the gas inside each energy storage unit 310, so that the gas detection component 330 can detect the gas of the corresponding energy storage unit 310 in real time through the corresponding branch pipe 322 and the switch valve 323, thereby improving the detection accuracy of the gas detection component 330.

[0158] In some embodiments, as shown in Figures 4 and 5 , at least two energy storage units 310 may be spaced apart along a predetermined direction, and at least two branch pipes 322 may be spaced apart along the predetermined direction. The main pipe 321 extends along a predetermined direction and is located on the same side of the at least two energy storage units 310. The predetermined direction may be indicated by arrow A in Figure 4 .

[0159] The above arrangement, with at least two branch pipes 322 spaced apart in a predetermined direction and the main pipe 321 located on the same side of the two energy storage units 310, facilitates the arrangement and connection of the two branch pipes 322 and the main pipe 321, facilitating the gas detection assembly 330 to detect gas within the at least two energy storage units 310 via the at least two branch pipes 322 and the main pipe 321. Furthermore, the neat arrangement of the at least two energy storage units 310 spaced apart in the predetermined direction also improves the internal space utilization of the energy storage device 300.

[0160] In some embodiments, as shown in Figures 4 to 6, a predetermined side 3101 of each energy storage unit 310 may be provided with an air extraction hole 311, which may communicate with the interior of the energy storage unit 310. Each branch pipe 322 may include a first pipe segment 3221 and a second pipe segment 3222 connected in a zigzag manner. The first pipe segment 3221 may communicate with the second pipe segment 3222, the first pipe segment 3221 may communicate with the air extraction hole 311, and the second pipe segment 3222 may communicate with the main pipe 321.

[0161] The extension direction of the main pipe 321 can be parallel to the predetermined side 3101 of at least two energy storage units 310 , the extension direction of the second pipe section 3222 is parallel to the predetermined side 3101 , and the extension direction of the first pipe section 3221 is set at an angle to the predetermined side 3101 .

[0162] Optionally, the predetermined side 3101 of each energy storage unit 310 may be the side of each energy storage unit 310 facing the gas detection assembly 330 , so that each branch pipe 322 can be connected to the predetermined side 3101 of each energy storage unit 310 and the main pipe 321 .

[0163] Through the above-mentioned arrangement, the line layout of each branch pipe 322 and the main pipe 321 can be made simple and neat. The bending arrangement of the branch pipe 322 can reduce the arrangement distance between the main pipe 321 and the predetermined side 3101, effectively saving space, so that the gas detection component 330 can quickly obtain and detect the gas inside each energy storage unit 310 through each branch pipe 322 and the main pipe 321, and can save the amount of pipelines, thereby reducing the cost of the energy storage device 300.

[0164] 4 and 5 , the extension length of the second tube segment 3222 may be greater than the extension length of the first tube segment 3221 , and / or the extension direction of the first tube segment 3221 may be perpendicular to the predetermined side 3101 .

[0165] The above arrangement facilitates the connection between the second pipe section 3222 and the first pipe section 3221 , and reduces the length of the energy storage device 300 in the extension direction of the first pipe section 3221 , thereby improving the space utilization of the energy storage device 300 .

[0166] In some embodiments, as shown in FIG. 4 to FIG. 6 , each energy storage unit 310 may include a mounting shell 312 and a power storage assembly 313 , and the power storage assembly 313 is disposed inside the mounting shell 312 .

[0167] The storage component 313 can be a component capable of storing electrical energy, such as a battery or a battery cell. Placing the storage component 313 within the mounting housing 312 protects the storage component 313 and isolates it from other components, making it less likely that other components or materials will affect the normal storage and discharge functions of the storage component 313.

[0168] Optionally, the air extraction hole 311 may be provided in the mounting housing 312. The first pipe section 3221 may be fixedly connected to the mounting housing 312 and sealed therewith. This arrangement allows gas within the mounting housing 312 to enter the first pipe section 3221 through the air extraction hole 311, and then pass through the first pipe section 3221, the second pipe section 3222, and the branch pipe 322 in sequence into the gas detection assembly 330 for detection by the gas detection assembly 330.

[0169] By sealing the first pipe section 3221 with the mounting shell 312, leakage of gas, liquid, etc. inside the mounting shell 312 from the exhaust hole 311 can be reduced, thereby improving the reliability of the energy storage device 300. Moreover, when the gas detection component 330 extracts the gas inside the mounting shell 312 of each energy storage unit 310 through the exhaust hole 311, the extracted gas is less likely to leak, thereby improving the detection accuracy of the gas detection component 330.

[0170] In some embodiments, as shown in Figures 4 to 6, the mounting shell 312 can also be provided with an annular sealing groove 3121 arranged around the exhaust hole 311, and the first pipe section 3221 can be inserted into the annular sealing groove 3121 and sealed with the groove wall of the annular sealing groove 3121.

[0171] By inserting the first pipe section 3221 into the annular sealing groove 3121 , the sealing setting of the exhaust hole 311 can be further strengthened, so that the gas inside the energy storage unit 310 is not easily leaked out of the installation shell 312 through the exhaust hole 311 , thereby enhancing the airtightness of the energy storage unit 310 .

[0172] Optionally, a sealing rubber ring that resists electrolyte corrosion may be added to the annular sealing groove 3121 . When the first pipe section 3221 is inserted into the annular sealing groove 3121 , it contacts the sealing rubber ring, thereby enhancing the sealing effect of the energy storage unit 310 .

[0173] In some embodiments, as shown in Figures 4 to 7, the gas detection assembly 330 may include a cavity 331 and at least one gas sensor 332. The cavity 331 may define a gas detection cavity 3311 and a through hole 3312 communicating with the gas detection cavity 3311. The main pipe 321 communicates with the gas detection cavity 3311 via the through hole 3312. The at least one gas sensor 332 is disposed in the gas detection cavity 3311 to detect gas entering the gas detection cavity 3311.

[0174] Through the above configuration, it is convenient for at least one gas sensor 332 to detect the gas extracted into the gas detection chamber 3311.

[0175] In some embodiments, as shown in FIG. 4 , the energy storage device 300 may include a housing 340 , and at least two energy storage units 310 may be disposed inside the housing 340 .

[0176] Optionally, at least two branch pipes 322 and at least two on-off valves 323 may be disposed within the containment shell 340. The containment shell 340 may have a mounting hole 341, into which the main pipe 321 extends. The cavity 331 may be fixedly disposed outside the containment shell 340, with the through hole 3312 communicating with the mounting hole 341.

[0177] By providing a mounting hole 341 in the containing shell 340, the main pipe 321 can extend through the mounting hole 341 and be connected to the cavity 331. The position of the main pipe 321 can also be further fixed, so that the main pipe 321 is not easily displaced and disconnected from the cavity 331, thereby improving the structural tightness of the energy storage device 300.

[0178] In some embodiments, at least a portion of the cavity 331 may be disposed in the mounting hole 341 and sealed to a wall of the mounting hole 341 .

[0179] Through the above-mentioned arrangement, the housing 340 of the energy storage unit 310 and the gas detection assembly 330 can be relatively fixed, thereby increasing the stability of the energy storage device 300. In addition, the cavity 331 is sealedly connected to the hole wall of the mounting hole 341, which can also prevent the gas in the cavity 331 and the main pipe 321 from leaking from the hole wall of the mounting hole 341, thereby improving the structural tightness of the energy storage device 300 and the accuracy of the gas detection assembly 330.

[0180] In some embodiments, as shown in Figure 8, the mounting hole 341 may include a first hole section 3411 and a second hole section 3412, and the aperture of the second hole section 3412 is larger than that of the first hole section 3411, so that the accommodating shell 340 forms a first step surface 3413 at the connection between the first hole section 3411 and the second hole section 3412.

[0181] Optionally, the second hole section 3412 is further away from the interior of the housing 340 than the first hole section 3411. At least a portion of the cavity 331 is inserted into the second hole section 3412 and is sealed to the hole wall of the second hole section 3412. The through hole 3312 is arranged opposite to the first hole section 3411 and is in communication with each other.

[0182] By arranging the first hole section 3411 and the second hole section 3412 in a stepped arrangement, it is convenient to fix the position of at least part of the cavity 331, and it is also convenient to insert at least part of the cavity 331 into the second hole section 3412 and seal it with the second hole section 3412, thereby making the connection structure between the cavity 331 and the containing shell 340 tighter.

[0183] In some embodiments, as shown in Figures 5 to 7, the cavity 331 may include a main cavity 3313 and an insertion portion 3314 connected to each other, with the gas detection cavity 3311 disposed in the main cavity 3313 and the insertion portion 3314. A second stepped surface 3315 is formed at the junction of the main cavity 3313 and the insertion portion 3314. At least one gas sensor 332 may be disposed within the main cavity 3313 and configured to detect gas within the main cavity 3313. The insertion portion 3314 is configured to connect to the mounting hole 341 and communicate with the main pipe 321.

[0184] Optionally, the second stepped surface 3315 corresponds to the first stepped surface 3413, and the insertion portion 3314 corresponds to the second hole section 3412. The insertion portion 3314 can be inserted into the second hole section 3412 and sealed with the hole wall of the second hole section 3412. The second stepped surface 3315 abuts the outer area of ​​the second hole section 3412. The through hole 3312 is provided on the side of the insertion portion 3314 away from the main cavity 3313, so that the through hole 3312 and the mounting hole 341 can communicate with each other, and the gas in the main pipe 321 can enter the main cavity 3313 through the mounting hole 341 and the through hole 3312.

[0185] By setting the connecting part between the cavity 331 and the mounting hole 341 to be stepped, the main cavity part 3313 and the insertion part 3314 of the cavity 331 can correspond to the mounting hole 341, thereby facilitating the installation of the cavity 331 to the mounting hole 341. It can also make the connection structure between the cavity 331 and the containing shell 340 tighter, so that the gas in the cavity 331 and the main pipe 321 is not easily leaked from the connecting part between the mounting hole 341 and the cavity 331.

[0186] In some embodiments, the insertion portion 3314 may abut against the first step surface 3413. The diameter of the through hole 3312 may be larger than the diameter of the first hole section 3411, and the through hole 3312 surrounds the first hole section 3411.

[0187] By setting the aperture of the through hole 3312 to be larger than the aperture of the first hole section 3411, the gas in the main pipe 321 can enter the cavity 331 through the mounting hole 341. The gas can flow more smoothly and less easily obstructed when passing through the mounting hole 341 from the main pipe 321, thereby facilitating the gas detection component 330 to detect the gas inside the energy storage unit 310 and improving the detection efficiency.

[0188] In some embodiments, the second step surface 3315 may be sealed to the peripheral area of ​​the second hole section 3412 .

[0189] Through the above arrangement, the gas in the cavity 331 and the main pipe 321 is unlikely to leak from the connection portion between the mounting hole 341 and the cavity 331 , thereby improving the airtightness of the energy storage device 300 .

[0190] In some embodiments, as shown in Figures 5 to 7, the cavity 331 may further be provided with an exhaust hole 3316 connected to the gas detection cavity 3311. The exhaust hole 3316 is provided with a first exhaust valve 3317, which is used to open or close the exhaust hole 3316. The exhaust hole 3316 is used to discharge gas in the gas detection cavity 3311.

[0191] Through the above arrangement, the detected gas can be discharged in time, so that the detected gas is less likely to affect subsequent gas detection.

[0192] In some embodiments, as shown in Figures 4 and 5, the energy storage device 300 may include a control circuit board 350. The control circuit board 350 may be disposed in the housing 340 and may be electrically connected to at least two on-off valves 323 and at least one gas sensor 332. The control circuit board 350 is configured to control the opening or closing of each on-off valve 323 and to obtain a detection signal from the at least one gas sensor 332.

[0193] Optionally, the control circuit board 350 may be a PCBA (Printed Circuit Board + Assembly) board. Optionally, the control circuit board 350 may include a processor 351. The processor 351 may be an integrated circuit chip with signal processing capabilities. The processor 351 may also be a general-purpose processor 351, a digital signal processor 351 (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. The general-purpose processor 351 may be a microprocessor 351 or any conventional processor 351.

[0194] By setting up a control circuit board 350 to control the opening or closing of each switch valve 323, the gas detection component 330 can individually locate and detect each energy storage unit 310, which not only improves the accuracy of the gas detection component 330, but also allows each energy storage unit 310 to be monitored.

[0195] Optionally, the first exhaust valve 3317 may also be connected to the control circuit board 350 and controlled by the control circuit board 350 to be opened or closed.

[0196] 4 and 5 , the control circuit board 350 may be disposed outside the housing 340. The control circuit board 350 defines a receiving hole 352, and the cavity 331 passes through the receiving hole 352.

[0197] By setting the cavity 331 in the accommodating hole 352 of the control circuit board 350, the control circuit board 350 and the cavity 331 can be relatively fixed, and the space utilization of the energy storage device 300 can be improved, and the distance between the control circuit board 350 and the switch valve 323 and the gas sensor 332 can be reduced, which also facilitates the electrical connection between the control circuit board 350 and the switch valve 323 and the gas sensor 332.

[0198] In some embodiments, as shown in Figures 4 to 7 , the cavity 331 can be provided with a lead hole 3318 that communicates with the gas detection cavity 3311. The wires of the at least one gas sensor 332 can be led out of the cavity 331 through the lead hole 3318 and connected to the control circuit board 350. This configuration facilitates the electrical connection between the control circuit board 350 and the gas sensor 332, thereby facilitating the control circuit board 350 to obtain the detection signal of the at least one gas sensor 332.

[0199] Optionally, the processor 351 may be connected to at least one gas sensor 332 and at least two switch valves 323 , and be used to control the opening or closing of each switch valve 323 , and to obtain a detection signal from at least one gas sensor 332 .

[0200] In some embodiments, as shown in Figures 4 to 7, the control circuit board 350 may be disposed outside the containment shell 340. The cavity 331 is fixedly disposed on the side of the control circuit board 350 facing the containment shell 340. The control circuit board 350 may be provided with connecting pins 353. The connecting pins 353 extend through the cavity 331 and connect to at least one gas sensor 332 within the gas detection cavity 3311. Optionally, the connecting pins 353 extend through the cavity 3318 and connect to at least one gas sensor 332 within the gas detection cavity 3311.

[0201] By arranging the control circuit board 350 outside the containment shell 340, the gas or liquid in the energy storage device 300 is not easily corroded by the control circuit board 350, and it is also convenient to install the control circuit board 350 on the containment shell 340 so that the control circuit board 350 can be connected to at least one gas sensor 332 through the connecting pin 353.

[0202] In some embodiments, as shown in FIG4 , the pipeline assembly 320 may include an air pump 324 , which is disposed on the main pipe 321 . The air pump 324 is used to pump the gas entering the main pipe 321 to the gas detection assembly 330 .

[0203] By setting up an air pump 324 to pump the gas in the main pipe 321 to the gas detection component 330, the gas in the main pipe 321 can smoothly enter the gas detection component 330 to be detected by the gas detection component 330, and the detection speed and efficiency can be accelerated, thereby improving the detection sensitivity of the gas detection component 330.

[0204] In some embodiments, the at least one gas sensor 332 may include at least one of a hydrogen sensor, a carbon dioxide sensor, a carbon monoxide sensor, and a methane sensor.

[0205] By configuring at least one gas sensor 332 to include multiple gas sensors 332 , the gas detection component 330 can detect multiple gases within the energy storage unit 310 , thereby monitoring the situation within each energy storage unit 310 from multiple dimensions.

[0206] Of course, in other embodiments, the at least one gas sensor 332 may also include other types of sensors such as an air pressure sensor, which are not listed in detail in this embodiment.

[0207] In some embodiments, the energy storage unit 310 may be a battery cell 1 . Alternatively, the energy storage unit 310 may be a battery 100 a , and each energy storage unit 310 may include a plurality of battery cells 1 .

[0208] The above configuration enables the energy storage device 300 to monitor the internal conditions of the battery 100a or battery cell 1 in real time through the gas detection assembly 330. This allows for timely detection of thermal runaway conditions in the battery 100a or battery cell 1, allowing for subsequent protective measures to be taken for the battery 100a or battery cell 1, thereby extending the lifespan of the battery 100a and battery cell 1. Furthermore, providing a single gas detection assembly 330 to monitor the internal conditions of multiple battery cells 1 can reduce the manufacturing cost of the battery 100a.

[0209] In some embodiments, as shown in FIG4 , the pipeline assembly 320 may further include an exhaust branch pipe 325 and a second exhaust valve 326. The exhaust branch pipe 325 is connected to the main pipe 321 and is used to discharge the gas in the main pipe 321 out of the pipeline assembly 320 or out of the energy storage device 300. The second exhaust valve 326 is provided on the exhaust branch pipe 325 and is used to open or close the exhaust branch pipe 325.

[0210] Through the above arrangement, the gas in the main pipe 321 can be discharged in a convenient and timely manner, so that the detected gas is less likely to affect subsequent gas detection.

[0211] In some embodiments, the control circuit board 350 can be configured to calculate the corresponding concentration based on the detection signal, determine a frequency adjustment strategy that matches the concentration, and adjust the switching frequency of the corresponding on-off valve 323 according to the frequency adjustment strategy. This arrangement enables real-time adjustment of the detection strategy based on the gas conditions within the energy storage device 300, thereby enabling more effective detection and monitoring of the conditions within the energy storage device 300 and enabling early prediction of thermal runaway conditions in the energy storage device 300.

[0212] For example, if the energy storage unit 310 is a battery cell 1, the gas detection assembly 330 connects to each battery cell 1 via the main pipe 321 and various branch pipes 322 and is used to detect the gas inside the battery cell 1. Under normal circumstances, the control circuit board 350 can sequentially control the opening of the on-off valve 323 corresponding to each battery cell 1 at a frequency of once per minute, so that the gas inside each battery cell 1 is detected by the gas detection assembly 330 once per minute. The gas detection assembly 330 detects the gas and transmits the corresponding detection signal to the control circuit board 350. If the gas concentration corresponding to the gas sensor 332 in the gas detection assembly 330 increases in a battery cell 1, the gas sensor 332 transmits the detected gas concentration information to the control circuit board 350. The control circuit board 350 further processes the gas concentration inside the battery cell 1 and determines that the gas concentration inside the battery cell 1 is increasing. It then adjusts the opening frequency of the on-off valve 323 corresponding to the battery cell 1, for example, to once every 0.5 minutes. This allows the control circuit board 350 to further confirm the gas conditions inside the battery cell 1 and more effectively monitor the internal conditions of the energy storage device 300.

[0213] Optionally, the control circuit board 350 can also be connected to other modules such as an alarm module, a switch module of the energy storage device 300, etc. When the control circuit board 350 processes and determines that the corresponding gas inside the energy storage unit 310 reaches a certain threshold, it can send an early warning signal to the alarm module so that the alarm module issues a warning or shuts down the energy storage device 300, etc., which can predict in advance whether the energy storage device 300 will have thermal runaway, thereby further protecting the energy storage device 300 and improving the reliability of the energy storage device 300.

[0214] In some embodiments of the present application, as shown in FIG9 , the present application provides a method for detecting the gas concentration of the energy storage device 300 in the above embodiment, the method comprising:

[0215] S100: Control the opening of at least one switch valve so that the gas inside the corresponding energy storage unit flows into the main pipe through the corresponding branch pipe.

[0216] Optionally, step S100 may further include the following steps S110-S120:

[0217] S110: Open a switch valve in each detection period to allow the gas inside the corresponding energy storage unit to flow into the main pipe in sequence.

[0218] The detection period may be set in advance with reference to situations such as thermal runaway occurring inside the energy storage unit 310 , so that the energy storage unit 310 may be detected in the early stages of situations such as thermal runaway occurring.

[0219] For example, if thermal runaway occurs inside the energy storage unit 310, and the time from the start of the internal gas increase to the explosion of the energy storage unit 310 is 5 minutes, the detection period can be set to 0.5 minutes, that is, at least one switch valve 323 is controlled to open once every 1 minute, and the gas sensor 332 detects the energy storage unit 310 corresponding to the switch valve 323 once every 1 minute, so that the process of thermal runaway of the monitored energy storage unit 310 can be predicted, thereby facilitating subsequent protection work and improving the reliability of the energy storage device 300.

[0220] Optionally, if there are multiple energy storage units 310 and the number of multiple switch valves 323 is also set to multiple, then each switch valve 323 can be opened in turn during each detection period to obtain the gas inside the energy storage unit 310 corresponding to each switch valve 323 in turn, so that the gas inside each energy storage unit 310 will not affect each other during the detection process.

[0221] Moreover, through the above-mentioned setting, the gas detection component 330 can detect each energy storage unit 310 separately, so that the gases between the energy storage units 310 are less likely to interfere with each other, thereby improving the specificity and accuracy of detection.

[0222] In some embodiments, after controlling the opening of at least one switching valve 323, the following steps are performed:

[0223] S120: Control the air pump on the main pipe to pump the gas on the branch pipe to the gas detection component through the main pipe.

[0224] Optionally, after the switch valve 323 is controlled to be opened, the air pump 324 on the main pipe 321 may be further turned on, and the air pump 324 further pumps the gas inside the energy storage unit 310 into the gas detection assembly 330 .

[0225] By setting up an air pump 324 to pump the gas in the branch pipe 322 to the gas detection component 330, the gas in the branch pipe 322 can smoothly enter the main pipe 321 and further enter the cavity 331 of the gas detection component 330 to be detected by the gas sensor 332, and can also increase the speed and efficiency of the gas detection component 330.

[0226] S200: The concentration of the gas obtained from the main pipe is detected by the gas detection component to obtain the concentration.

[0227] In some embodiments, this step may further include step S210:

[0228] S210: In each detection period, the concentration of the gas inside the corresponding energy storage unit obtained from the main pipe is detected by the gas detection component to obtain the concentration.

[0229] Specifically, the gas detection component 330 detects the concentration of the gas inside the corresponding energy storage unit 310 obtained from the main pipe 321 during each detection period to obtain a relevant electrical signal, and further sends the electrical signal to the control circuit board 350. The control circuit board 350 further processes the relevant electrical signal to obtain the concentration of the gas inside the corresponding energy storage unit 310.

[0230] In some embodiments, after detecting the gas concentration inside the energy storage unit 310 , the following steps are included:

[0231] S300: Determine a frequency adjustment strategy that matches the concentration.

[0232] After the gas concentration obtained from the main pipe 321 is detected by the gas detection component 330 to obtain the gas concentration, step S220 may optionally further include steps S310-S330:

[0233] S310: Compare the concentration with a preset concentration threshold.

[0234] The preset concentration threshold can be set based on the concentration of the corresponding gas within the energy storage unit 310 after thermal runaway or other conditions occur. That is, if the concentration is greater than the preset concentration threshold, it indicates that thermal runaway or other conditions have occurred in the energy storage unit 310. Therefore, by comparing the concentration with the preset concentration threshold, thermal runaway or other conditions can be detected in a timely manner.

[0235] S320: If the concentration is less than or equal to the preset concentration threshold, the frequency adjustment strategy is to detect the concentration of the gas inside the corresponding energy storage unit in each detection period.

[0236] S330: If the concentration is greater than the preset concentration threshold, the frequency adjustment strategy is set to increase the switching frequency of the corresponding switching valve.

[0237] Among them, the frequency adjustment strategy can be a pre-set strategy to achieve real-time adjustment of the detection strategy according to the gas conditions inside the energy storage device 300, thereby more effectively detecting and monitoring the conditions inside the energy storage device 300 and predicting in advance the occurrence of thermal runaway of the energy storage device 300.

[0238] By comparing the concentration with a preset concentration threshold and when the concentration is greater than the preset concentration threshold, the detection frequency can be increased by increasing the switching frequency of the corresponding switching valve 323, so that the situation inside the energy storage unit 310 can be monitored more timely, thereby increasing the sensitivity and accuracy of the gas detection component 330 in detecting the inside of the energy storage unit 310, and can also timely detect situations such as thermal runaway of the energy storage device 300, so as to facilitate subsequent corresponding protection measures for the energy storage device 300, thereby improving the life of the energy storage device 300.

[0239] S400: Adjust the switching frequency of the corresponding switching valve according to the frequency regulation strategy.

[0240] Optionally, after determining that the frequency regulation strategy is set to increase the switching frequency of the corresponding switching valve 323, the opening frequency of the corresponding switching valve 323 is adjusted and increased according to the frequency regulation strategy to increase the detection frequency of the internal gas of the corresponding energy storage unit 310, thereby more effectively monitoring the changes in the corresponding gas in the energy storage device 300.

[0241] In some embodiments, after the concentration of the gas obtained from the main pipe 321 is detected by the gas detection component 330 to obtain the concentration, the following steps may also be included:

[0242] S500: Discharge the gas in the main pipe and the gas detection assembly to the outside, and return to execute the control to open at least one switch valve to enable the next detection.

[0243] Specifically, the gas in the cavity 331 can be discharged to the outside by controlling the first exhaust valve 3317, and the gas in the main pipe 321 and the branch pipe 322 can be discharged to the outside of the containment shell 340 by controlling the second exhaust valve 326. By promptly discharging the detected gas in the main pipe 321 and the gas detection assembly 330, the detected gas is less likely to affect subsequent gas detection.

[0244] According to some embodiments of the present application, as shown in Figures 4 to 8, an energy storage device 300 includes at least two energy storage units 310, a piping assembly 320, and a gas detection assembly 330. The piping assembly 320 includes a main pipe 321, at least two branch pipes 322, and at least two on-off valves 323. Each branch pipe 322 connects the interior of an energy storage unit 310 with the main pipe 321. Each on-off valve 323 is provided on a branch pipe 322 and is configured to open or close the corresponding branch pipe 322. The gas detection assembly 330 is connected to the main pipe 321 and is configured to obtain gas from the interior of at least one of the energy storage units 310 through the main pipe 321 and detect the concentration of the obtained gas. The at least two energy storage units 310 are spaced apart along a predetermined direction, and the at least two branch pipes 322 are spaced apart along the predetermined direction. The main pipe 321 extends along the predetermined direction and is located on the same side of the at least two energy storage units 310. Each energy storage unit 310 has an exhaust hole 311 formed on the predetermined side 3101 thereof, which communicates with the interior of the energy storage unit 310. Each branch pipe 322 includes a first pipe section 3221 and a second pipe section 3222 connected in a zigzag manner. The first pipe section 3221 communicates with the second pipe section 3222, which in turn communicates with the exhaust hole 311, and the second pipe section 3222 communicates with the main pipe section 321. The main pipe section 321 extends parallel to the predetermined side 3101 of at least two energy storage devices 300, the second pipe section 3222 extends parallel to the predetermined side 3101, and the first pipe section 3221 extends at an angle to the predetermined side 3101. The second pipe section 3222 extends longer than the first pipe section 3221. Alternatively, the first pipe section 3221 extends perpendicular to the predetermined side 3101. Each energy storage unit 310 includes a mounting shell 312 and a storage component 313, and the storage component 313 is arranged inside the mounting shell 312. The exhaust hole 311 is opened in the mounting shell 312. The first pipe section 3221 is fixedly connected to the mounting shell 312 and is sealed with the mounting shell 312. The mounting shell 312 also has an annular sealing groove 3121 arranged around the exhaust hole 311. The first pipe section 3221 is inserted into the annular sealing groove 3121 and is sealed with the groove wall of the annular sealing groove 3121. The gas detection component 330 includes a cavity 331 and at least one gas sensor 332. The cavity 331 has a gas detection cavity 3311 and a through hole 3312 connected to the gas detection cavity 3311. The main pipe 321 is connected to the gas detection cavity 3311 through the through hole 3312. At least one gas sensor 332 is arranged in the gas detection cavity 3311 for entering the gas in the gas detection cavity 3311. The energy storage device 300 includes a housing 340, within which at least two energy storage units 310 are disposed. At least two branch pipes 322 and at least two switch valves 323 are disposed. The housing 340 defines a mounting hole 341, into which the main pipe 321 extends.The cavity 331 is fixedly arranged outside the containment shell 340, and the through hole 3312 is connected to the mounting hole 341. At least a portion of the cavity 331 is arranged in the mounting hole 341 and is sealed with the hole wall of the mounting hole 341. The mounting hole 341 includes a first hole section 3411 and a second hole section 3412. The aperture of the second hole section 3412 is larger than that of the first hole section 3411, so that the containment shell 340 forms a first step surface 3413 at the connection between the first hole section 3411 and the second hole section 3412. The second hole section 3412 is farther away from the interior of the containment shell 340 than the first hole section 3411. At least a portion of the cavity 331 is inserted into the second hole section 3412 and is sealed with the hole wall of the second hole section 3412. The through hole 3312 is arranged opposite to the first hole section 3411 and is connected to each other. The cavity 331 includes a main cavity portion 3313 and an insertion portion 3314 connected to each other, and the gas detection cavity 3311 is arranged in the main cavity portion 3313 and the insertion portion 3314. A second step surface 3315 is formed at the connection between the main cavity portion 3313 and the insertion portion 3314. The through hole 3312 is arranged on the side of the insertion portion 3314 away from the main cavity portion 3313. The insertion portion 3314 is inserted into the second hole section 3412 and is sealed with the hole wall of the second hole section 3412. The second step surface 3315 abuts the outer area of ​​the second hole section 3412. The insertion portion 3314 abuts the first step surface 3413. The aperture of the through hole 3312 is larger than the aperture of the first hole section 3411, and the through hole 3312 surrounds the first hole end. The second step surface 3315 is sealed with the outer area of ​​the second hole section 3412. The cavity 331 also defines an exhaust hole 3316 that communicates with the gas detection chamber 3311. This exhaust hole 3316 is equipped with a first exhaust valve 3317, which is used to open or close the exhaust hole 3316. The exhaust hole 3316 is used to discharge gas from the gas detection chamber 3311. The energy storage device 300 includes a control circuit board 350, which is disposed within the containment shell 340 and electrically connected to at least two on / off valves 323 and at least one gas sensor 332. The control circuit board 350 is used to control the opening and closing of each on / off valve 323 and to obtain detection signals from the at least one gas sensor 332. The control circuit board 350 is disposed outside the containment shell 340. A receiving hole 352 is defined within the control circuit board 350, and the cavity 331 extends through the receiving hole 352. The cavity 331 is provided with a lead hole 3318 that communicates with the gas detection chamber 3311. The wires of the at least one gas sensor 332 can be led out of the cavity 331 through the lead holes 3318 and connected to the control circuit board 350. The control circuit board 350 is disposed outside the housing 340. The cavity 331 is fixedly mounted on the side of the control circuit board 350 facing the housing 340. The control circuit board 350 is provided with connecting pins 353. The connecting pins 353 extend through the cavity 331 and connect to the at least one gas sensor 332 within the gas detection cavity 3311.The control circuit board 350 is configured to calculate the corresponding concentration based on the detection signal, determine a frequency adjustment strategy that matches the concentration, and adjust the switching frequency of the corresponding on-off valve 323 according to the frequency adjustment strategy. The pipeline assembly 320 includes an air pump 324, which is mounted on the main pipe 321. The air pump 324 is configured to pump gas entering the main pipe 321 to the gas detection assembly 330. The at least one gas sensor 332 includes at least one of a hydrogen sensor, a carbon dioxide sensor, a carbon monoxide sensor, and a methane sensor. The energy storage unit 310 is a battery cell 1. Alternatively, the energy storage unit 310 is a battery 100a, each of which includes multiple battery cells 1. The pipeline assembly 320 also includes an exhaust branch pipe 325 and a second exhaust valve 326. The exhaust branch pipe 325 is connected to the main pipe 321 and is configured to discharge gas within the main pipe 321 out of the pipeline assembly 320 or out of the energy storage device 300. The second exhaust valve 326 is mounted on the exhaust branch pipe 325 and is configured to open or close the exhaust branch pipe 325.

[0245] In some embodiments of the present application, as shown in FIG9 , the method for detecting the gas concentration of the energy storage device 300 in the above embodiment may include: controlling the opening of at least one switch valve 323 so that the gas inside the corresponding energy storage unit 310 flows into the main pipe 321 through the corresponding branch pipe 322; and detecting the concentration of the gas obtained from the main pipe 321 by the gas detection component 330 to obtain the concentration.

[0246] In some embodiments, after the gas concentration is detected by the gas detection component 330 from the main pipe 321 to obtain the gas concentration, the steps may include: determining a frequency adjustment strategy that matches the concentration; and adjusting the switching frequency of the corresponding switching valve 323 according to the frequency adjustment strategy.

[0247] In some embodiments, determining the frequency adjustment strategy based on the concentration includes: comparing the concentration with a preset concentration threshold; if the concentration is greater than the preset concentration threshold, setting the frequency adjustment strategy to increase the switching frequency of the corresponding switching valve 323.

[0248] In some embodiments, after controlling the opening of at least one switch valve 323 , the method includes controlling the gas pump 324 on the main pipe 321 to pump the gas on the branch pipe 322 to the gas detection assembly 330 through the main pipe 321 .

[0249] In some embodiments, controlling the opening of at least one switch valve 323 includes: opening a switch valve 323 in each detection period to allow the gas inside the corresponding energy storage unit 310 to flow into the main pipe 321 in sequence;

[0250] In some embodiments, after the concentration of the gas obtained from the main pipe 321 is detected by the gas detection component 330 to obtain the concentration, it includes: discharging the gas in the main pipe 321 and the gas detection component 330 to the outside, and returning to execute the control of opening at least one switch valve 323 to enable the next detection.

[0251] In summary, by configuring the same gas detection assembly 330 to detect at least two energy storage units 310, the gas detection assembly 330 can effectively detect the gas within each energy storage unit 310 while also reducing the number of gas detection assemblies 330, lowering the cost of the energy storage device 300, and improving the internal space utilization of the energy storage device 300. Corresponding branch pipes 322 and on-off valves 323 are provided between the gas detection assembly 330 and each energy storage unit 310. These branch pipes 322 and on-off valves 323 are utilized to separate the gas within each energy storage unit 310, thereby enabling the gas detection assembly 330 to effectively detect the gas within each energy storage unit 310 and improving the detection accuracy of the gas detection assembly 330.

[0252] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An energy storage device, characterized in that: include: at least two energy storage units; A pipeline assembly, comprising a main pipe, at least two branch pipes and at least two switch valves; each branch pipe is connected to the interior of an energy storage unit and the main pipe; each switch valve is arranged on a branch pipe, for opening or closing the corresponding branch pipe; The gas detection component is connected to the main pipe and is used to obtain gas from the inside of at least one of the energy storage units from the main pipe and detect the concentration of the obtained gas.

2. The energy storage device according to claim 1, characterized in that: The at least two energy storage units are arranged at intervals along a preset direction, and the at least two branch pipes are arranged at intervals along the preset direction; the main pipe extends along the preset direction and is located on the same side of the at least two energy storage units.

3. The energy storage device according to claim 2, characterized in that: An exhaust hole is provided on a predetermined side of each energy storage unit, and the exhaust hole is connected to the interior of the energy storage unit; each branch pipe includes a first pipe section and a second pipe section that are bent and connected; the first pipe section is connected to the second pipe section, the first pipe section is connected to the exhaust hole, and the second pipe section is connected to the main pipe; wherein the extension direction of the main pipe is parallel to the predetermined side of the at least two energy storage devices, the extension direction of the second pipe section is parallel to the predetermined side, and the extension direction of the first pipe section is set at an angle to the predetermined side.

4. The energy storage device according to claim 3, characterized in that: An extension length of the second pipe segment is greater than an extension length of the first pipe segment; and / or an extension direction of the first pipe segment and the predetermined side are perpendicular to each other.

5. The energy storage device according to claim 3, characterized in that: Each of the energy storage units includes a mounting shell and a power storage component, wherein the power storage component is arranged inside the mounting shell; the air extraction hole is opened in the mounting shell; and the first pipe section is fixedly connected to the mounting shell and is sealed with the mounting shell.

6. The energy storage device according to claim 4, characterized in that: The installation shell is also provided with an annular sealing groove surrounding the air extraction hole, and the first pipe section is inserted into the annular sealing groove and is sealed and connected to the groove wall of the annular sealing groove.

7. The energy storage device according to claim 1, characterized in that: The gas detection component includes a cavity and at least one gas sensor; the cavity is provided with a gas detection cavity and a through hole connected to the gas detection cavity, the main pipe is connected to the gas detection cavity through the through hole, and the at least one gas sensor is arranged in the gas detection cavity for detecting the gas entering the gas detection cavity.

8. The energy storage device according to claim 7, characterized in that: The energy storage device includes a containing shell, the at least two energy storage units are arranged inside the containing shell; the at least two branch pipes and the at least two switch valves are arranged inside the containing shell; the containing shell is provided with a mounting hole, the main pipe extends into the mounting hole; the cavity is fixedly arranged outside the containing shell, and the through hole is connected to the mounting hole.

9. The energy storage device according to claim 8, characterized in that: At least a portion of the cavity is disposed in the mounting hole and is sealed and connected to a hole wall of the mounting hole.

10. The energy storage device according to claim 9, characterized in that: The mounting hole includes a first hole segment and a second hole segment, the aperture of the second hole segment is larger than that of the first hole segment, so that the containment shell forms a first step surface at the connection between the first hole segment and the second hole segment; the second hole segment is farther away from the interior of the containment shell than the first hole segment; at least part of the cavity is inserted into the second hole segment and is sealed and connected to the hole wall of the second hole segment; the through hole is arranged opposite to the first hole segment and is connected to each other.

11. The energy storage device according to claim 10, characterized in that: The cavity body includes a main cavity portion and an insertion portion connected to each other, and the gas detection cavity is arranged in the main cavity portion and the insertion portion; a second step surface is formed at the connection between the main cavity portion and the insertion portion; the through hole is arranged on a side of the insertion portion away from the main cavity portion; the insertion portion is inserted into the second hole segment and is sealed and connected to the hole wall of the second hole segment; the second step surface abuts against the outer area of ​​the second hole segment.

12. The energy storage device according to claim 11, characterized in that: The insertion portion abuts against the first step surface; the aperture of the through hole is larger than the aperture of the first hole segment, and the through hole surrounds the first hole segment.

13. The energy storage device according to claim 11, characterized in that: The second step surface is sealingly connected to the peripheral area of ​​the second hole segment.

14. The energy storage device according to claim 8, characterized in that: The cavity body is further provided with an exhaust hole connected to the gas detection cavity. The exhaust hole is provided with a first exhaust valve. The first exhaust valve is used to open or close the exhaust hole. The exhaust hole is used to discharge the gas in the gas detection cavity.

15. The energy storage device according to claim 8, characterized in that: The energy storage device includes a control circuit board, which is arranged in the containing shell and is electrically connected to the at least two switch valves and the at least one gas sensor; the control circuit board is used to control the opening or closing of each of the switch valves and to obtain the detection signal of the at least one gas sensor.

16. The energy storage device according to claim 15, characterized in that: The control circuit board is arranged outside the accommodating shell; the control circuit board is provided with an accommodating hole, and the cavity is arranged through the accommodating hole.

17. The energy storage device according to claim 15 or 16, characterized in that: The cavity is provided with a lead hole communicating with the gas detection cavity; the lead wire of the at least one gas sensor can be led out of the cavity through the lead hole and connected to the control circuit board.

18. The energy storage device according to claim 15, characterized in that: The control circuit board is arranged outside the containing shell; the cavity is fixedly arranged on the side of the control circuit board facing the containing shell; the control circuit board is provided with connecting pins; the connecting pins pass through the cavity and are connected to the at least one gas sensor in the gas detection cavity.

19. The energy storage device according to claim 15, characterized in that: The control circuit board is used to calculate the corresponding concentration according to the detection signal, determine the frequency adjustment strategy matching the concentration, and adjust the corresponding switching frequency of the switching valve according to the frequency adjustment strategy.

20. The energy storage device according to claim 19, characterized in that: The control circuit board is used to compare the concentration with a preset concentration threshold; if the concentration is greater than the preset concentration threshold, the corresponding frequency adjustment strategy is to increase the switching frequency of the corresponding switching valve.

21. The energy storage device according to claim 1 or 15, characterized in that: The pipeline assembly comprises an air pump, which is arranged on the main pipe; the air pump is used to pump the gas entering the main pipe to the gas detection assembly.

22. The energy storage device according to claim 7, characterized in that: The at least one gas sensor includes at least one of a hydrogen sensor, a carbon dioxide sensor, a carbon monoxide sensor, and a methane sensor.

23. The energy storage device according to claim 1, characterized in that: The energy storage unit is a battery cell; or, the energy storage unit is a battery, and each of the energy storage units includes a plurality of battery cells.

24. The energy storage device according to claim 1, characterized in that: The pipeline assembly also includes an exhaust branch pipe and a second exhaust valve. The exhaust branch pipe is connected to the main pipe and is used to discharge the gas in the main pipe out of the pipeline assembly or the energy storage device. The second exhaust valve is arranged on the exhaust branch pipe and is used to open or close the exhaust branch pipe.

25. A method for detecting gas concentration of an energy storage device according to any one of claims 1 to 24, characterized in that: The detection method comprises: Controlling the opening of at least one of the switch valves so that the gas inside the corresponding energy storage unit flows into the main pipe through the corresponding branch pipe; The concentration of the gas obtained from the main pipe is detected by the gas detection component to obtain the concentration.

26. The method according to claim 25, characterized in that After the concentration of the gas obtained from the main pipe is detected by the gas detection component to obtain the gas concentration, the method includes: determining a frequency regulation strategy that matches the concentration; The switching frequency of the corresponding switching valve is adjusted according to the frequency regulation strategy.

27. The method according to claim 26, characterized in that The determination and the frequency adjustment strategy of the concentration include: comparing the concentration to a preset concentration threshold; If the concentration is greater than the preset concentration threshold, the frequency adjustment strategy is set to increase the switching frequency of the corresponding switch valve. Rate.

28. The method according to claim 25, characterized in that After controlling the opening of at least one of the switch valves, the method further comprises: The gas pump on the main pipe is controlled to pump the gas on the branch pipe to the gas detection component through the main pipe.

29. The method according to claim 25, characterized in that The controlling the opening of at least one of the switch valves comprises: Opening one of the switch valves in each detection period to allow the gas inside the corresponding energy storage unit to flow into the main pipe in sequence; The step of detecting the concentration of the gas obtained from the main pipe by the gas detection component to obtain the concentration includes: In each detection period, the concentration of the gas inside the corresponding energy storage unit obtained from the main pipe is detected by the gas detection component to obtain the concentration.

30. The method according to claim 25, characterized in that: After the concentration of the gas obtained from the main pipe is detected by the gas detection component to obtain the concentration, the method includes: The gas in the main pipe and the gas detection assembly is discharged to the outside, and the control of opening at least one of the switch valves is returned to enable the next detection.

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