Battery and electric apparatus

Abstract

A battery and an electric apparatus. The battery comprises a case, a battery cell group, and an optical fiber gas detection assembly; the case has an accommodating space; the battery cell group comprises a top portion, a peripheral side, and a bottom portion; the battery cell group and the optical fiber gas detection assembly are arranged in the accommodating space; the optical fiber gas detection assembly comprises at least one optical fiber; the at least one optical fiber is provided with multiple gas detection positions; the gas detection positions are arranged in the accommodating space at intervals and are located on the periphery of the battery cell group; the gas detection positions include a first gas detection position and a second gas detection position; the first gas detection position is arranged on at least one of the top portion and the bottom portion, and the second gas detection position is arranged on the peripheral side; the gas detection positions are used for detecting preset gas in the accommodating space; at least four gas detection positions are not on the same plane. By means of the mode, multi-point detection can be performed on the preset gas in the battery, thereby improving the comprehensiveness and accuracy of gas detection.

Description

Batteries and electrical devices

Technical field

[0001] The present application relates to the field of battery technology, and in particular to batteries and electrical devices. [Background Technology]

[0002] With the development of battery technology, batteries are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive power sector. Batteries store chemical energy and controllably convert it into electrical energy. In recyclable batteries, after discharge, the active materials can be reactivated by recharging for continued use.

[0003] Because battery cells release gases under certain abnormal conditions, such as thermal runaway, some current technologies use gas sensors to monitor the atmosphere within the battery, thereby detecting thermal runaway in advance. However, current gas sensors are generally expensive, and their detection principles are often unsuitable for environments found in energy storage systems such as batteries. Consequently, these limitations limit the number and placement of gas sensors within batteries, making comprehensive and accurate monitoring of gas levels within the battery difficult.

[0004] [Summary of the invention]

[0005] In view of the above problems, the present application provides a battery and an electrical device that can perform multi-point detection of preset gases in the battery, thereby improving the accuracy and diversity of battery gas detection.

[0006] In a first aspect, the present application provides a battery, comprising a housing, a battery cell group, and an optical fiber gas detection assembly. The housing has a storage space; the battery cell group comprises a top, a peripheral side, and a bottom, the top and bottom being disposed opposite each other, the peripheral side being connected between the top and the bottom, and the battery cell group being disposed in the storage space; the optical fiber gas detection assembly is disposed in the storage space, the optical fiber gas detection assembly comprising at least one optical fiber, the at least one optical fiber having a plurality of gas detection positions, the plurality of gas detection positions being disposed at intervals within the storage space and located on the periphery of the battery cell group, the plurality of gas detection positions comprising at least one first gas detection position and at least one second gas detection position, the at least one first gas detection position being disposed corresponding to at least one of the top and the bottom, and the at least one second gas detection position being disposed corresponding to the peripheral side; the gas detection positions are used to detect a preset gas in the storage space; and at least four gas detection positions are not located in the same plane.

[0007] Through the above method, a fiber optic gas detection component is set in the storage space within the battery shell, and multiple gas detection positions are spaced apart on different sides of the periphery of the battery cell group, so that preset gases at multiple positions in the storage space can be detected. For the preset gases near different sides of the periphery of the battery cell group, a gas detection point array with a three-dimensional distribution can be formed in the storage space, thereby expanding the gas detection range and making the gas detection results more comprehensive and reliable.

[0008] In some embodiments, the battery cell group includes at least one battery cell, and each battery cell is provided with an explosion-proof valve for internal pressure relief in the area corresponding to the top, and the explosion-proof valve is used to spray gas above the top during operation; at least one first gas detection position is arranged opposite to the top and is located above the top.

[0009] Through the above method, since the explosion-proof valve can release the gas in the battery cell earlier, at least one first gas detection position can detect the gas near the explosion-proof valve on the battery cell used to spray gas, thereby responding more quickly and effectively to the preset gas released from the battery cell through the explosion-proof valve, thereby improving the sensitivity and accuracy of gas detection.

[0010] In some embodiments, the number of the at least one first gas detection location is greater than or equal to the number of the at least one battery cell.

[0011] By means of the above method, more first gas detection positions can be set to perform more comprehensive detection of the explosion-proof valve in the area on the top of the battery cell group, thereby reducing the probability of missed detection of the gas ejected by the explosion-proof valve and improving the comprehensiveness of gas detection.

[0012] In some embodiments, each first gas detection position is disposed opposite to the top and is located above an explosion-proof valve of a battery cell.

[0013] Through the above method, each first gas detection position can be used to accurately detect the gas ejected from the corresponding explosion-proof valve, thereby improving the response speed of the first gas detection position to the preset gas released by the corresponding explosion-proof valve, thereby improving the sensitivity and accuracy of gas detection.

[0014] In some embodiments, there are multiple at least one battery cell and multiple at least one first gas detection position, and each first gas detection position is arranged at the top and is located above the middle area of ​​the explosion-proof valve of each two adjacent battery cells.

[0015] In the above manner, one first gas detection position is used to detect the gases ejected from two explosion-proof valves, thereby reducing the probability of missing detection of abnormal battery cells, thereby improving the accuracy of gas detection and reducing the cost of deploying the first gas detection position.

[0016] In some embodiments, at least one battery cell is multiple and arranged along a preset arrangement direction, and at least one first gas detection position is multiple and arranged at intervals along the preset arrangement direction.

[0017] Through the above-mentioned method, the plurality of first gas detection positions can be arranged in parallel with the plurality of battery cells, thereby being able to satisfy the concentration detection of the plurality of battery cells as much as possible and improving the accuracy of gas detection.

[0018] In some embodiments, the number of at least one first gas detection position is multiple, and the number of at least one second gas detection position is multiple; the extension length of the optical fiber segment between each two adjacent first gas detection positions is less than the extension length of the optical fiber segment between each two adjacent second gas detection positions.

[0019] Through the above method, the first gas detection positions closer to the top are denser than the second gas detection positions, effectively coordinating the number of first gas detection positions and second gas detection positions with different sensitivities to the preset gas released by the battery cells, thereby improving the gas detection sensitivity while saving the cost of setting up the second gas detection positions.

[0020] In some embodiments, a ratio of the number of the at least one first gas detection position to the area of ​​the top is greater than a ratio of the number of the at least one second gas detection position to the area of ​​the circumference.

[0021] Through the above method, the first gas detection positions closer to the top are denser than the second gas detection positions, effectively coordinating the number of first gas detection positions and second gas detection positions with different sensitivities to the preset gas released by the battery cells, thereby improving the gas detection sensitivity while saving the cost of setting up the second gas detection positions.

[0022] In some embodiments, the multiple gas detection positions also include at least one third gas detection position arranged at the bottom; the ratio of the number of at least one third gas detection position to the area of ​​the bottom is smaller than the ratio of the number of at least one second gas detection position to the area of ​​the surrounding side.

[0023] In this way, the third gas detection position can be used to detect the atmosphere near the bottom of the battery cell group, reducing the missed detection rate and false detection rate of gas detection, thereby improving the comprehensiveness and accuracy of gas detection.

[0024] In some embodiments, the number of at least one second gas detection positions is multiple and divided into at least two groups, and the second gas detection positions of each group are arranged at intervals along the circumference of the battery cell group; at least two groups of second gas detection positions are arranged at intervals in the direction from top to bottom; in each two adjacent groups of second gas detection positions, the number of second gas detection positions in the group near the top is greater than the number of second gas detection positions in the group near the bottom.

[0025] Through the above method, multiple groups of second gas detection positions can be arranged in different directions on the circumference, increasing the number of gas detection positions, reducing the missed detection rate and false detection rate of gas detection, and thus improving the comprehensiveness and accuracy of gas detection.

[0026] In some embodiments, in a group of second gas detection positions near the top, the extension length of the optical fiber segment between each two adjacent second gas detection positions is a first extension length; in a group of second gas detection positions near the bottom, the extension length of the optical fiber segment between each two adjacent second gas detection positions is a second extension length; the first extension length is less than the second extension length.

[0027] Through the above method, the second gas detection positions near the top are denser than the second gas detection positions near the bottom, which can effectively coordinate the number of second gas detection positions with different sensitivities due to different setting positions, thereby improving the gas detection sensitivity while controlling the cost of deploying the second gas detection positions.

[0028] In some embodiments, the battery cell has an assembly connection position, the plurality of gas detection positions include at least one fourth gas detection position, and the at least one fourth gas detection position is arranged corresponding to the assembly connection position.

[0029] By adopting the above method, a fourth gas detection position can be provided corresponding to the assembly connection position of the battery cell where gas leakage is easy, thereby quickly responding to gas escaping from the battery cell, thereby improving the sensitivity of gas detection.

[0030] In some embodiments, the assembly connection location includes a weld or an assembly gap.

[0031] Through the above method, a quick response can be made to the gas escaping through the weld or assembly gap, thereby improving the sensitivity of gas detection.

[0032] In some embodiments, the battery cell includes a shell having an open end, an end plate and an electrode assembly, the electrode assembly is arranged inside the shell through the open end, the end plate is arranged at the open end and assembled and connected to the shell, and there is an assembly connection position between the end plate and the shell.

[0033] In this way, it is possible to quickly respond to gas leakage through the assembly connection position between the end plate and the housing of the battery cell.

[0034] In some embodiments, the battery cell is provided with an injection hole for injecting electrolyte into the interior of the battery cell; the multiple gas detection positions include at least one fifth gas detection position; and the at least one fifth gas detection position is arranged corresponding to the injection hole.

[0035] By adopting the above method, it is possible to quickly respond to gas leaking through the liquid injection hole and improve the sensitivity of gas detection.

[0036] In some embodiments, the peripheral side includes two first side surfaces and two second side surfaces, the two first side surfaces are arranged opposite to each other, and the two second side surfaces are arranged opposite to each other and are respectively connected to the two first side surfaces; the area of ​​the first side surface is larger than the area of ​​the second side surface; at least part of the second gas detection positions are arranged in an array manner on at least one of the two first side surfaces; and / or, at least part of the second gas detection positions are arranged in an array manner on at least one of the two second side surfaces.

[0037] By adopting the above method, the second gas detection position can be set for different side surfaces around the battery cell, thereby quickly responding to the gas near different side surfaces and reducing the missed detection rate and false detection rate of gas detection.

[0038] In some embodiments, at least one optical fiber is wound around the periphery of the battery cell group, and the periphery of the optical fiber is coated with a bending buffer layer.

[0039] Through the above method, the bending buffer layer can be used to protect the optical fiber wrapped around the periphery of the battery cell group, thereby improving the strength of the optical fiber gas detection component, reducing the probability of the optical fiber bending or even breaking due to vibration or collision, and thus improving the stability of gas detection.

[0040] In some embodiments, the bending buffer layer includes a polyimide film; and / or at least one optical fiber is fixed to the periphery of the battery cell group or the surface of the shell close to the accommodation space by fixing glue.

[0041] Through the above-mentioned method, the strength of the optical fiber gas detection component can be improved by using the polyimide film, and / or a relatively low-cost fixing glue can be used to achieve a better optical fiber fixing effect.

[0042] In some embodiments, palladium or palladium alloy sensitive materials are coated on a plurality of locations spaced apart from each other on the optical fiber to form a plurality of gas detection locations on the optical fiber for detecting the concentration of hydrogen.

[0043] Through the above method, a plurality of specific gas detection positions can be formed by utilizing the palladium or palladium alloy sensitive material arranged on the optical fiber, thereby detecting the hydrogen concentration near the gas detection position, thereby improving the sensitivity and accuracy of gas detection.

[0044] In some embodiments, the battery includes a light source and a demodulation module, which are arranged on the shell. The light source is coupled to at least one optical fiber and is used to input detection light into the at least one optical fiber; the demodulation module is coupled to at least one optical fiber and is used to receive feedback light output by the at least one optical fiber and demodulate the feedback light to obtain a concentration measurement signal corresponding to each gas detection position.

[0045] In the above manner, a light source can be used to input an optical signal into the optical fiber, and the demodulation module can be used to demodulate the output optical signal, thereby effectively obtaining a gas concentration measurement signal corresponding to each gas detection position.

[0046] In some embodiments, the battery further includes a processor coupled to the demodulation module, configured to receive a concentration measurement signal and obtain the gas concentration measured at each gas detection position according to the concentration measurement signal.

[0047] Through the above-mentioned manner, the processor can effectively use the concentration measurement signal obtained by the demodulation module to perform calculations, thereby obtaining the gas concentration measured at each gas detection position.

[0048] In some embodiments, the processor is configured to generate a gas concentration distribution map of the battery according to the position of each gas detection position in the accommodation space and the corresponding gas concentration.

[0049] In the above manner, the gas concentration distribution diagram generated by the processor can intuitively present the gas concentration distribution of the battery.

[0050] In some embodiments, the processor is configured to determine whether an abnormality occurs in the battery based on the gas concentrations measured at multiple gas detection locations, and if an abnormality occurs, execute corresponding early warning measures.

[0051] Through the above method, the battery condition can be judged based on the measured gas concentration, and an early warning can be issued when an abnormality occurs, thereby improving the stability of the battery.

[0052] In some embodiments, the light source and the demodulation module are arranged on the same circuit board, and the circuit board is arranged in the shell and located outside the shell; the optical fiber gas detection assembly also includes a transmission connector, which is coupled to at least one optical fiber; the transmission connector is passed through the shell; the light source and the demodulation module are coupled to the transmission connector, the light source inputs detection light to at least one optical fiber through the transmission connector, and the demodulation module receives feedback light through the transmission connector.

[0053] In the above manner, the light source and demodulation module provided on the same circuit board can be used to input light into and receive light from the optical fiber respectively, so that the gas detection position on the optical fiber can detect gas.

[0054] In a second aspect, the present application provides an electrical device comprising a battery as described in any one of the above items.

[0055] In some embodiments, the electrical device includes a light source and a demodulation module. The light source is coupled to at least one optical fiber and is used to input detection light into the at least one optical fiber. The demodulation module is coupled to at least one optical fiber and is used to receive feedback light output by the at least one optical fiber and demodulate the feedback light to obtain a concentration measurement signal corresponding to each gas detection position.

[0056] Through the above-mentioned method, the gas concentration measurement signal corresponding to each gas detection position can be effectively obtained, thereby facilitating the acquisition of the gas concentration at each gas detection position.

[0057] In some embodiments, the electrical device further includes a processor coupled to the demodulation module, configured to receive a concentration measurement signal and obtain the gas concentration measured at each gas detection position according to the concentration measurement signal.

[0058] Through the above method, the concentration measurement signal can be effectively used to obtain the gas concentration measured at each gas detection position.

[0059] In some embodiments, the processor is configured to generate a gas concentration distribution map of the battery according to the position of each gas detection location on the battery and the corresponding gas concentration.

[0060] Through the above method, the gas concentration distribution of the battery can be presented intuitively.

[0061] In some embodiments, the processor is configured to determine whether an abnormality occurs in the battery based on the gas concentrations measured at multiple gas detection locations, and if an abnormality occurs, execute corresponding early warning measures.

[0062] Through the above method, the battery condition can be judged according to the gas concentration, and an early warning can be issued when an abnormality occurs, thereby improving the stability of the battery.

[0063] 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

[0064] 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:

[0065] FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0066] FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0067] FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0068] FIG4 is a schematic structural diagram of two battery cells and an optical fiber gas detection assembly according to one or more embodiments;

[0069] FIG5 is a schematic structural diagram of a battery cell group and an optical fiber gas detection assembly according to one or more embodiments;

[0070] FIG6 is a schematic structural diagram of an electric device according to one or more embodiments;

[0071] FIG7 is a schematic diagram of the structure of an optical fiber according to one or more embodiments.

[0072] The accompanying drawings in the specific implementation manner are as follows:

[0073] 1000a vehicles;

[0074] 100a battery; 200a controller; 300a motor;

[0075] 10a housing; 11a first portion; 12a second portion; 13a accommodation space;

[0076] 1 battery cell; 1b power-consuming device;

[0077] 21 end plate; 22 housing; 221 open end; 23 electrode assembly; 23a electrode tab; 24 explosion-proof valve; 25 assembly connection position; 26 pole; 27 injection hole; 3 fiber optic gas detection assembly; 31 gas detection position; 311 first gas detection position; 312 second gas detection position; 313 third gas detection position; 32 transmission connector; 4 battery cell group; 41 top; 42 side; 421 first side; 422 second side; 43 bottom; 5 light source; 6 fiber optic modem; 61 demodulation module; 62 modulation module; 7 processor; 83 optical fiber; 84 fiber optic patch cord;

[0078] D1 is the length of the optical fiber segment between two adjacent first gas detection positions; D2 is the extended length of the optical fiber segment between two adjacent second gas detection positions; D3 is the first extended length; D4 is the second extended length; D5 is the extended length of the optical fiber segment between two adjacent third gas detection positions. [Specific implementation method]

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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).

[0085] 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.

[0086] 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.

[0087] With the development of battery technology, batteries are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive power sector. Batteries store chemical energy and controllably convert it into electrical energy. In recyclable batteries, after discharge, the active materials can be reactivated by recharging for continued use.

[0088] However, during the actual battery charge and discharge process, chemical energy isn't fully converted into electrical energy; instead, some of it is converted into heat. Uncontrolled, abnormal changes in battery temperature can also be referred to as thermal runaway. Because battery cells release gas when experiencing abnormal temperature changes, some current technologies use gas sensors to monitor the atmosphere within the battery to effectively monitor battery temperature and reduce the likelihood of thermal runaway.

[0089] The inventors have noticed that current gas sensors are generally expensive, and their detection principles are actually not very suitable for the strong magnetic environment in energy storage systems such as batteries. Therefore, the number and location of gas sensors in the battery are limited by these objective reasons, making it difficult to monitor the gas in the battery at multiple points and more accurately.

[0090] In order to alleviate the problem of incomplete and inaccurate gas detection in batteries, the applicant has discovered that the type of gas sensor can be replaced to utilize a gas detection component with lower cost and suitable principle to detect the gas in the battery.

[0091] Based on the above considerations, the present application provides a battery and an electrical device. The battery includes a housing, a battery cell group, and an optical fiber gas detection assembly. The housing has a storage space; the battery cell group and the optical fiber gas detection assembly are disposed in the storage space; the optical fiber gas temperature measurement assembly includes at least one optical fiber, the at least one optical fiber having multiple gas detection positions, the multiple gas detection positions being spaced apart within the storage space and located on the periphery of the battery cell group for detecting preset gases within the storage space; and at least four gas detection positions are not located on the same plane.

[0092] By installing a fiber optic gas detection assembly within the battery housing's storage space and positioning multiple gas detection points on the optical fiber at different locations around the battery cell pack, multi-point detection of pre-set gases within the battery can be performed. This improves the comprehensiveness and accuracy of gas detection, making the gas detection results more reliable.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] In some embodiments, the battery 100a may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] In some embodiments, the battery 100 a may include a battery cell group. When there are multiple battery cells 1 , the multiple battery cells 1 are arranged and fixed to form a battery cell group.

[0101] In some embodiments, referring to FIG. 2 , the battery 100 a may be a battery pack, which includes a housing 10 a and a battery cell 1 . The battery cell 1 or the battery cell group 4 is accommodated in an accommodation space 13 a formed inside the housing 10 a .

[0102] In some embodiments, the housing 10a may serve as part of the chassis structure of the vehicle 1000a. For example, a portion of the housing 10a may form at least a portion of the floor of the vehicle 1000a, or a portion of the housing 10a may form at least a portion of a cross member or a longitudinal member of the vehicle 1000a.

[0103] Referring to Figure 2, the battery 100a includes a housing 10a and a battery cell 1, with the battery cell 1 being housed within the housing 10a. The housing 10a is configured to provide a housing space 13a for the battery cell 1, and the housing 10a may have a variety of structures. In some embodiments, the housing 10a may include a first portion 11a and a second portion 12a, the first portion 11a and the second portion 12a overlapping each other, and the first portion 11a and the second portion 12a jointly defining a housing space 13a for accommodating the battery cell 1. The second portion 12a may be a hollow structure with one end open, and the first portion 11a may be a plate-like structure, with the first portion 11a overlapping the open side of the second portion 12a, so that the first portion 11a and the second portion 12a jointly define the housing space 13a. The first portion 11a and the second portion 12a may also be hollow structures each with one end open, with the open side of the first portion 11a overlapping the open side of the second portion 12a. Of course, the housing 10a formed by the first portion 11a and the second portion 12a can be in various shapes, such as a cylinder, a cuboid, etc.

[0104] 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 refers to a combination of series and parallel connections among the multiple battery cells 1. The multiple battery cells 1 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell group 4 may be contained within the housing 10a. Of course, the battery 100a may also be a battery cell group 4 formed by first connecting multiple battery cells 1 in series, in parallel, or in a hybrid connection, and then the multiple battery cell groups 4 may be connected in series, in parallel, or in a hybrid connection to form an entire battery cell group 4 contained within the housing 10a. The battery 100a may also include other structures, for example, the battery 100a may also include tabs, which are used to achieve electrical connection between the multiple battery cells 1.

[0105] Each battery cell 1 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 1 can be cylindrical, flat, rectangular, or in other shapes.

[0106] Please refer to Figure 3, which is a schematic diagram of the exploded structure of a battery cell 1 provided in some embodiments of the present application. A battery cell 1 is the smallest unit that makes up a battery. As shown in Figure 3, a battery cell 1 includes an end plate 21, a housing 22, an electrode assembly 23, and other functional components.

[0107] The end plate 21 refers to a component that covers the open end of the outer shell 22 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end plate 21 can be adapted to the shape of the outer shell 22 to match the outer shell 22. Optionally, the end plate 21 can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the end plate 21 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 the pole 26 can be provided on the end plate 21. The pole 26 can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy from the battery cell 1. In some embodiments, the end plate 21 can also be provided with an explosion-proof valve 24 for ejecting gas to release internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The material of the end plate 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end plate 21 to isolate the electrical connection components in the housing 22 from the end plate 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0108] The outer shell 22 is a component used to cooperate with the end plate 21 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The outer shell 22 and the end plate 21 can be independent components, and an opening can be provided on the outer shell 22, and the internal environment of the battery cell 1 is formed by covering the opening with the end plate 21. Without limitation, the end plate 21 and the outer shell 22 can also be integrated. Specifically, the end plate 21 and the outer shell 22 can form a common connection surface before other components are inserted into the shell. When the interior of the outer shell 22 needs to be encapsulated, the end plate 21 is covered with the outer shell 22. The outer shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc.

[0109] Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the application does not impose any special restrictions on this.

[0110] The electrode assembly 23 is a component in the battery cell 1 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects to the pole 26 to form a current loop.

[0111] According to some embodiments of the present application, as shown in Figures 2 to 5, Figure 2 is a schematic diagram of the exploded structure of a battery according to one or more embodiments. Figure 3 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments. Figure 4 is a schematic diagram of the structure of two battery cells and a fiber optic gas detection assembly according to one or more embodiments. Figure 5 is a schematic diagram of the structure of a battery cell group and a fiber optic gas detection assembly according to one or more embodiments. Battery 100a described in the embodiment of battery 100a of the present application includes a housing 10a, a battery cell group 4, and a fiber optic gas detection assembly 3. The housing 10a defines a storage space 13a for accommodating the battery cell group 4 and the fiber optic gas detection assembly 3. The battery cell group 4 includes at least one battery cell 1, forming an energy storage structure formed by connecting at least one battery cell 1 in series, parallel, or hybrid. A battery cell 1 is the smallest unit for energy storage and output. The fiber optic gas detection assembly 3 includes at least one optical fiber 83, which has multiple gas detection locations 31. The multiple gas detection locations 31 are spaced apart within the storage space 13a and located around the periphery of the battery cell group 4, for detecting predetermined gases within the storage space 13a. At least four gas detection positions 31 are not located in the same plane.

[0112] Multiple gas detection positions 31 are arranged at intervals in the optical fiber 83 along the extension direction of the optical fiber 83, so that the light input into the optical fiber 83 can pass through each gas detection position 31 along the optical fiber 83 in sequence, thereby detecting the preset gas at each gas detection position 31.

[0113] The determination that at least four gas detection locations 31 are not located in the same plane can be based on connecting the center points of the gas detection locations 31 to form multiple line segments to determine whether the gas detection locations 31 are located in the same plane. The periphery of the battery cell group 4 may refer to the space between the outer surface of the battery cell group 4 and the inner wall of the accommodation space 13a. The optical fiber 83 may be arranged in this space, for example, wrapped around the outer surface of the battery cell group 4, so that the gas detection locations 31 can detect the predetermined gas contained in this space.

[0114] Optionally, the preset gas may be at least one of hydrogen, carbon monoxide, methane, ethane, ethylene, propane, hydrogen sulfide, and the like. For example, the gas detection locations 31 may be gas-specific, and different gas detection locations 31 may be used to detect different gases. For example, each gas detection location 31 may be used to detect the same gas. For example, when detecting a particular gas, the indicator detected by the gas detection location 31 may be the gas concentration. For example, when detecting different gases, the indicators detected by the gas detection locations 31 may be the gas composition and gas concentration.

[0115] The present application achieves a distributed arrangement of gas detection points by providing multiple gas detection locations 31 on at least one optical fiber 83, with these multiple gas detection locations 31 located on the periphery of the battery cell group 4. Compared to installing multiple independent gas sensors, multiple gas detection locations 31 based on optical fibers 83 can reduce the cost of gas detection. Furthermore, due to the relatively low cost, the number of gas detection locations 31 provided on the battery 100a can be greater than the number of gas sensors, thereby expanding the range of gas detection, reducing the probability of missed detection and / or false detection due to a small number of gas sensors, and effectively improving the accuracy and comprehensiveness of gas detection.

[0116] According to some embodiments of the present application, as shown in Figures 2, 4, and 5, a battery cell group 4 may include a top 41, a side 42, and a bottom 43. The top 41 and the bottom 43 are disposed opposite each other, and the side 42 is connected between the top 41 and the bottom 43. The plurality of gas detection locations 31 include at least one first gas detection location 311 and at least one second gas detection location 312. The first gas detection location 311 is disposed corresponding to at least one of the top 41 and the bottom 43, while the second gas detection location 312 is disposed corresponding to the side 42.

[0117] Three different names, top 41, side 42, and bottom 43, can be used to distinguish different locations on the periphery of the battery cell pack 4. The top 41 and bottom 43 can be named based on the actual installation orientation of the battery cell pack 4 in the accommodation space 13a. Top 41 and bottom 43 are two vertically opposite ends, with the top 41 at the top and the bottom 43 at the bottom. Side 42 is a general term for other surfaces connecting the top 41 and bottom 43. The first gas detection position 311 can detect gas near at least one of the top 41 and bottom 43, while the second gas detection position 312 can detect gas near the side 42, thereby forming a three-dimensional network for detecting gas near the periphery of the battery cell pack 4.

[0118] By setting a first gas detection position 311 corresponding to at least one of the top 41 and the bottom 43 and setting a second gas detection position 312 corresponding to the side 42, different gas detection positions 31 can be used to detect preset gases at different positions around the battery cell group 4, making the gas detection results more comprehensive and reliable.

[0119] Gas may be generated in the battery cell 1 due to the reaction, or the gas in the battery cell 1 may expand due to the increase in temperature. In either case, the outward pressure in the battery cell 1 will increase. If the pressure is not released in time, the battery cell 1 may explode and cause an accident.

[0120] According to some embodiments of the present application, as shown in Figures 3 and 4, a battery cell group 4 may include at least one battery cell 1. Each battery cell 1 is provided with an explosion-proof valve 24 in an area corresponding to the top 41 thereof for internal pressure relief. The explosion-proof valve 24 is configured to eject gas upward toward the top 41 during operation, thereby reducing the pressure in the battery cell 1 and improving the stability of the battery cell 1 during the ejection process. The top 41 may be oriented in several directions extending from the outer surface of the top 41 toward the accommodation space 13a, i.e., in a direction away from the battery cell group 4.

[0121] At least one first gas detection position 311 can be arranged opposite to the top 41 and located above the top 41, so that the first gas detection position 311 can detect the gas ejected through the explosion-proof valve 24 when the explosion-proof valve 24 is working, and the gas rising to the vicinity of the top 41 in the accommodating space 13a can also be detected by the first gas detection position 311.

[0122] At the same time, the setting of the explosion-proof valve 24 corresponding to the top 41 can also enable the explosion-proof valve 24 to release pressure in the direction away from the battery cell group 4, which can avoid affecting other nearby battery cells 1 during pressure release, improve safety, and facilitate unified inspection and management of the explosion-proof valve 24.

[0123] By arranging the explosion-proof valve 24 of the battery cell 1 relative to the top 41 , the atmosphere near the explosion-proof valve 24 for ejecting gas on the battery cell 1 can be detected, thereby more quickly and accurately monitoring whether the battery cell 1 has thermal runaway by detecting the preset gas.

[0124] According to some embodiments of the present application, the number of at least one first gas detection position 311 can be greater than or equal to the number of at least one battery cell 1, so that the density of the first gas detection position 311 is greater than or equal to the density of at least one battery cell 1, thereby measuring more gas data and improving the accuracy of gas detection.

[0125] For example, when the first gas detection positions 311 are evenly distributed, the first gas detection positions 311 can also be set one by one corresponding to each battery cell 1, so that the gas near each battery cell 1 can be measured by at least one first gas detection position 311, thereby improving the accuracy of gas detection and avoiding missing detection of gas near the battery cell 1.

[0126] By setting the number of the first gas detection positions 311 to be greater than or equal to the number of at least one battery cell 1 , more first gas detection positions 311 can be used to perform more comprehensive detection on the battery cell 1 , thereby improving the accuracy of gas detection.

[0127] According to some embodiments of the present application, as shown in FIG. 4 , each first gas detection position 311 is disposed opposite to the top 41 and is located above the explosion-proof valve 24 of one battery cell 1 .

[0128] By providing a one-to-one correspondence between the first gas detection position 311 and the explosion-proof valve 24 of each battery cell 1, the first gas detection position 311 can be used to more accurately detect the gas emitted by each explosion-proof valve 24, thereby improving the efficiency and accuracy of gas detection. This also prevents the omission of abnormal battery cells 1 and allows the first gas detection position 311 to accurately locate the abnormal battery cell 1.

[0129] Specifically, when operating, the explosion-proof valve 24, located corresponding to the top portion 41, ejects gas in a direction away from the battery cell group 4, that is, upwardly in the direction of the top portion 41. Therefore, the first gas detection position 311, located above and in the direction of the top portion 41, can accurately detect the gas ejected from the explosion-proof valve 24. Furthermore, since the locations in the battery 100a most susceptible to thermal runaway are located within the battery cells 1, detecting the gas ejected from the explosion-proof valve 24 is also beneficial for monitoring whether thermal runaway is occurring within the battery 100a.

[0130] According to some embodiments of the present application, referring to Figure 4, the number of at least one battery cell 1 is multiple, the number of at least one first gas detection position 311 is multiple, and each first gas detection position 311 is arranged opposite to the top 41 and is located above the middle area of ​​the explosion-proof valve 24 of each two adjacent battery cells 1.

[0131] That is, the first gas detection position 311 located above the middle area of ​​the explosion-proof valves 24 of two adjacent battery cells 1 can detect the gas ejected from the two adjacent explosion-proof valves 24 , that is, one first gas detection position 311 can be used to monitor two adjacent battery cells 1 .

[0132] By setting a first gas detection position 311 between two adjacent explosion-proof valves 24, the gas ejected from the two adjacent explosion-proof valves 24 can be detected using one first gas detection position 311, thereby reducing the probability of missing detection of abnormal battery cells 1 and saving the number of first gas detection positions 311, thereby reducing the cost of setting up the optical fiber gas detection component 3 and improving the comprehensiveness and accuracy of gas detection.

[0133] According to some embodiments of the present application, at least one battery cell 1 is multiple, and the multiple battery cells 1 are arranged along a preset arrangement direction. At least one first gas detection position 311 is multiple, and the multiple first gas detection positions 311 are arranged at intervals along the preset arrangement direction.

[0134] Optionally, the preset arrangement direction can be a linear direction, allowing the battery cells 1 to be regularly arranged along a straight line, thereby making the shape of the battery cell group 4 and even the battery 100a more regular, facilitating installation in an electrical device. Furthermore, the neat arrangement of multiple battery cells 1 also facilitates the layout of the fiber optic gas detection assembly 3. Furthermore, the preset arrangement direction can also be a plurality of linear directions located in the same plane and crisscrossing each other, thereby forming an array of multiple battery cells 1 on the same plane.

[0135] By the above method, the plurality of first gas detection positions 311 can be arranged in parallel with the plurality of battery cells 1 , so that each first gas detection position 311 can be set corresponding to the battery cell 1 , thereby improving the accuracy of gas detection.

[0136] According to some embodiments of the present application, refer to FIG. 7 , which is a schematic diagram of the structure of an optical fiber according to one or more embodiments. There are multiple first gas detection locations 311, and multiple second gas detection locations 312. The extended length D1 of the optical fiber segment between each pair of adjacent first gas detection locations 311 is less than the extended length D2 of the optical fiber segment between each pair of adjacent second gas detection locations 312.

[0137] Specifically, the first gas detection position 311 and the second gas detection position 312 can actually be sections set on the optical fiber 83. When comparing the extension length D1 of the optical fiber section between the two adjacent first gas detection positions 311 and the extension length D2 of the optical fiber section between the two adjacent second gas detection positions 312, the two adjacent first gas detection positions 311 are two adjacent first gas detection positions 311 on the same optical fiber 83, and the two adjacent second gas detection positions 312 are also two adjacent second gas detection positions 312 on the same optical fiber 83. The extension length of the optical fiber section can be the length of the optical fiber 83 between the end of the previous gas detection position 31 and the head end of the adjacent subsequent gas detection position 31.

[0138] Since the gas with higher temperature will naturally rise in the accommodating space 13a, and the explosion-proof valve 24 that can spray out gas is also set at the position corresponding to the top 41, the ability of the gas near the peripheral side 42 to represent thermal runaway will be relatively weaker than the gas near the top 41. Therefore, when the extension length D1 of the optical fiber segment between each two adjacent first gas detection positions 311 is less than the extension length D2 of the optical fiber segment between each two adjacent second gas detection positions 312, the gas near the top 41 can be better monitored.

[0139] By setting the extension length D2 of the optical fiber segment between each two adjacent second gas detection positions 312 to be greater than the extension length D1 of the optical fiber segment between each two adjacent first gas detection positions 311, different gas detection positions 31 are set at different positions according to the law of gas change, so that the first gas detection positions 311 on the optical fiber 83 close to the top 41 and the explosion-proof valve 24 are denser than the second gas detection positions 312 on the optical fiber 83 that is slightly farther away, thereby improving the efficiency of gas detection while avoiding the arrangement of too many second gas detection positions 312 at positions where the gas characterization thermal runaway capability is weak, thereby reducing the waste of second gas detection positions 312 and thus reducing costs.

[0140] According to some embodiments of the present application, the ratio of the number of the at least one first gas detection position 311 to the area of ​​the top 41 is greater than the ratio of the number of the at least one second gas detection position 312 to the area of ​​the peripheral side 42 .

[0141] The first gas detection positions 311 are located above the top 41 in the direction of the top 41, thereby being able to detect gas near the top 41. The ratio of the number of first gas detection positions 311 to the area of ​​the top 41 can reflect how many first gas detection positions 311 can be used to monitor gas near the top 41 per unit area. The second gas detection positions 312 are arranged corresponding to the peripheral side 42. The ratio of the number of second gas detection positions 312 to the area of ​​the peripheral side 42 can reflect how many second gas detection positions 312 can be used to monitor gas near the peripheral side 42 per unit area. Therefore, the larger this ratio is, the more gas detection positions 31 can be used to monitor the unit area, that is, the more densely packed the gas detection positions 31 are, and it can be inferred that the results measured and output by the gas detection positions 31 are more comprehensive and accurate.

[0142] Since the gas with higher temperature will naturally rise in the accommodating space 13a, and the explosion-proof valve 24 that can spray gas is also set at the position corresponding to the top 41, the ability of the gas near the peripheral side 42 to represent thermal runaway will be relatively weaker than the gas near the top 41. Therefore, when the ratio of the number of first gas detection positions 311 to the area of ​​the top 41 is appropriately greater than the ratio of the number of second gas detection positions 312 to the area of ​​the peripheral side 42, the gas near the top 41 can be better monitored.

[0143] By setting the ratio of the number of first gas detection positions 311 to the area of ​​the top 41 to be greater than the ratio of the number of second gas detection positions 312 to the area of ​​the peripheral side 42, the first gas detection positions 311 closer to the explosion-proof valve 24 are denser than the second gas detection positions 312, and the gas near the top 41 can be monitored more closely than the gas near the peripheral side 42. This improves the efficiency of gas detection while avoiding the deployment of too many second gas detection positions 312 at positions where the gas's ability to represent thermal runaway is weak, thereby reducing the waste of the second gas detection positions 312 and thus reducing costs.

[0144] According to some embodiments of the present application, referring to FIG. 5 , the plurality of gas detection positions 31 further include at least one third gas detection position 313 disposed at the bottom 43 , thereby being able to detect the gas near the bottom 43 .

[0145] The ratio of the number of at least one third gas detection position 313 to the area of ​​the bottom 43 is less than the ratio of the number of at least one second gas detection position 312 to the area of ​​the peripheral side 42. It can be inferred that the number of third gas detection positions 313 monitoring each unit area of ​​the bottom 43 is smaller than the number of second gas detection positions 312 monitoring each unit area of ​​the peripheral side 42. Because higher-temperature gas naturally rises in the containment space 13a, and the explosion-proof valve 24 capable of ejecting gas is also located away from the bottom 43, the gas near the bottom 43 is relatively less capable of indicating thermal runaway than the gas near the top 41 and the peripheral side 42. Therefore, the third gas detection positions 313 located at the bottom 43 can be less densely distributed than the second gas detection positions 312 and the first gas detection positions 311, thereby reducing the cost of setting up the third gas detection positions 313 while still being able to detect gas near the bottom 43.

[0146] Optionally, referring to Figure 7, the extension length D5 of the optical fiber segment between two adjacent third gas detection positions 313 is that the ratio of the number of at least one third gas detection position 313 to the area of ​​the bottom 43 is less than the ratio of the number of at least one second gas detection position 312 to the area of ​​the peripheral side 42, which can be expressed as: the extension length D5 of the optical fiber segment between each two adjacent third gas detection positions 313 is greater than the extension length D2 of the optical fiber segment between each two adjacent second gas detection positions 312.

[0147] By setting at least one third gas detection position 313 at the bottom 43, the third gas detection position 313 can be used to detect the atmosphere near the bottom 43 of the battery cell group 4, thereby improving the comprehensiveness of gas detection; at the same time, the third gas detection positions 313 set at the bottom 43 can be less dense than the second gas detection positions 312 and the first gas detection positions 311, which can avoid arranging too many third gas detection positions 313 at positions where the gas characterization of thermal runaway capability is weak, thereby reducing waste and thus reducing the cost of detecting gas.

[0148] According to some embodiments of the present application, referring to Figure 5, the number of at least one second gas detection position 312 is multiple and divided into at least two groups, each group of second gas detection positions 312 is arranged at intervals along the circumference of the battery cell group 4, and at least two groups of second gas detection positions 312 are arranged at intervals in the direction from the top 41 to the bottom 43.

[0149] The circumferential direction may be a direction parallel to the circumferential side 42 and circumferentially surrounding the battery cell group 4. Within a group of second gas detection locations 312 arranged along the circumferential direction, each second gas detection location 312 is sequentially spaced apart on each side of the circumferential side 42, and each second gas detection location 312 is spaced apart from the top and / or bottom at the same distance. For example, a plurality of second gas detection locations 312 on a single optical fiber 83 is referred to as a group of second gas detection locations 312. The optical fiber 83 is arranged circumferentially along the circumferential side 42, such that the group of second gas detection locations 312 is spaced apart circumferentially. At least two such optical fibers 83 are arranged along the circumferential side 42 of the battery cell group 4, such that the second gas detection locations 312 are spaced apart not only circumferentially but also in a direction from the top 41 to the bottom 43.

[0150] In each two adjacent groups of second gas detection positions 312, the number of the second gas detection positions 312 in the group near the top 41 is greater than the number of the second gas detection positions 312 in the group near the bottom 43, so that the second gas detection positions 312 closer to the top 41 are denser than the second gas detection positions 312 at the bottom 43, so that the gas near the top 41 that represents a stronger ability to indicate thermal runaway can be more strictly monitored; at the same time, it is avoided to deploy too many second gas detection positions 312 at positions where the gas has a weaker ability to represent thermal runaway, so as to reduce the waste of the second gas detection positions 312 and thus reduce costs.

[0151] By arranging multiple groups of second gas detection positions 312 at different distances from the top 41 on the peripheral side 42, the gas near each position of the peripheral side 42 can be monitored, thereby improving the comprehensiveness of gas detection; at the same time, the second gas detection positions 312 closer to the top 41 are arranged more densely, which can improve the gas detection efficiency while saving the cost of setting up the second gas detection positions 312.

[0152] According to some embodiments of the present application, referring to FIG. 7 , in a group of second gas detection positions 312 near the top 41, the extension length D2 of the optical fiber segment between each two adjacent second gas detection positions 312 is a first extension length D3; in a group of second gas detection positions 312 near the bottom 43, the extension length D2 of the optical fiber segment between each two adjacent second gas detection positions 312 is a second extension length D4; the first extension length D3 is less than the second extension length D4.

[0153] Specifically, the second gas detection locations 312 may be a segment disposed on an optical fiber. When discussing the extended length D2 of the optical fiber segment between two adjacent second gas detection locations 312, the two adjacent second gas detection locations 312 may be two adjacent second gas detection locations 312 on the same optical fiber 83. The extended length of the optical fiber segment may be the length of the optical fiber 83 between the end of the preceding second gas detection location 312 and the beginning of the following second gas detection location 312, thereby ensuring that the density of the first gas detection locations 311 on the optical fiber 83 is greater than the density of the second gas detection locations 312.

[0154] Through the above method, the second gas detection positions 312 near the top 41 of the explosion-proof valve 24 are more densely distributed than the second gas detection positions 312 near the bottom 43, which can improve the sensitivity of detecting gas near the explosion-proof valve 24 while reducing the cost of deploying the second gas detection positions 312.

[0155] According to some embodiments of the present application, referring to FIG. 3 , the battery cell 1 may have an assembly connection position 25 , and the plurality of gas detection positions 31 include at least one fourth gas detection position 31 , and the at least one fourth gas detection position 31 is arranged corresponding to the assembly connection position 25 .

[0156] The assembly connection locations 25 can be locations on the battery cell 1 where the various components are connected to form a whole, such as the seam between the end plate 21 of the battery cell 1 and the open end 221 of the outer casing 22. However, the sealing at these assembly connection locations 25 is weaker than at other integral parts, and gas within the battery cell 1 may escape into the accommodation space 13a through these assembly connection locations 25. The fourth gas detection location 31 is positioned adjacent to or opposite the assembly connection location 25, enabling it to respond to gas leaks through the assembly connection location 25.

[0157] By setting the fourth gas detection position 31 corresponding to the assembly connection position 25, it can correspond to the gas near the assembly connection position 25 where the battery cell 1 is prone to gas leakage, so that a quick response can be made when gas escapes through the assembly connection position 25, thereby improving the comprehensiveness of gas detection.

[0158] According to some embodiments of the present application, the assembly connection location 25 includes a weld or an assembly gap.

[0159] A weld seam can be a location on a battery cell 1 that is welded together to form a whole, such as the welds on the outer casing 22 formed by welding multiple pieces of material. An assembly gap can be the assembly point between different components of a battery cell 1. The sealing of joints like weld seams and assembly gaps is difficult to ensure, especially when the internal environment of a battery cell 1 is corrosive or undergoes pressure or temperature fluctuations. The stability of the materials at these joints may decrease, making it more likely that gases within the battery cell 1 will escape through these joints. Therefore, gases near weld seams or assembly gaps are also important targets for inspection and should not be ignored.

[0160] By arranging the fourth gas detection position 31 at the weld or assembly gap, a quick response can be given to the gas escaping through the weld or assembly gap, thereby improving the comprehensiveness of gas detection.

[0161] According to some embodiments of the present application, referring to Figure 3, the battery cell 1 may include a shell 22 having an open end 221, an end plate 21 and an electrode assembly 23, the electrode assembly 23 is arranged inside the shell 22 through the open end 221, the end plate 21 is arranged at the open end 221 and is assembled and connected to the shell 22, and an assembly connection position 25 is provided between the end plate 21 and the shell 22.

[0162] The housing 22 is used to cooperate with the end plate 21 to form an internal environment of the battery cell 1, which is used to accommodate the electrode assembly 23, electrolyte and other components. The end plate 21 covers the open end 221 to form the internal environment of the battery cell 1.

[0163] Optionally, the end plate 21 and the shell 22 may also be integrated. Specifically, the end plate 21 and the shell 22 may form a common connection surface before other components are inserted into the shell. When the interior of the shell 22 needs to be encapsulated, the end plate 21 covers the shell 22.

[0164] By setting a fourth gas detection position 31 for the assembly connection position 25 between the end plate 21 and the outer shell 22, it is possible to quickly respond to gas leaking through the assembly connection position 25 between the end plate 21 and the outer shell 22 of the battery cell 1, thereby reducing the probability of gas escaping from the battery cell 1 being missed.

[0165] According to some embodiments of the present application, referring to FIG3 , a battery cell 1 is provided with an injection hole 27 for injecting electrolyte into the interior of the battery cell 1. The plurality of gas detection locations 31 include at least one fifth gas detection location 31 , which is disposed corresponding to the injection hole 27 .

[0166] The electrolyte is one of the media for the battery 100a reaction to occur in the battery cell 1. The injection hole 27 for injecting the electrolyte can connect the environment inside and outside the battery cell 1. Therefore, the gas in the battery cell 1 may also escape into the accommodation space 13a through the injection hole 27.

[0167] By providing the fifth gas detection position 31 corresponding to the liquid injection hole 27 , the fifth gas detection position 31 can be used to quickly respond to gas leaking through the liquid injection hole 27 , thereby reducing the probability of missing detection of gas escaping from the battery cell 1 .

[0168] According to some embodiments of the present application, referring to FIG. 5 , the peripheral side 42 includes two first side surfaces 421 and two second side surfaces 422. The two first side surfaces 421 are disposed opposite each other, and the two second side surfaces 422 are disposed opposite each other and respectively connected to the two first side surfaces 421. The area of ​​the first side surface 421 is larger than the area of ​​the second side surface 422. At least some of the second gas detection locations 312 are disposed in an array on at least one of the two first side surfaces 421; and / or at least some of the second gas detection locations 312 are disposed in an array on at least one of the two second side surfaces 422.

[0169] The peripheral side 42 of the battery cell group 4 has at least four surfaces, including a first side surface 421 with a larger area and a second side surface 422 with a smaller area. The two first side surfaces 421 are respectively connected to the two second side surfaces 422. At least one of these four surfaces is provided with second gas detection locations 312 in an array, thereby detecting gas near the surface provided with the second gas detection locations 312.

[0170] By setting a second gas detection position 312 on at least one of the first side surface 421 and the second side surface 422 of the peripheral side 42, a quick response to nearby gas is achieved, and the second gas detection positions 312 are arranged in an array manner, which can improve the comprehensiveness of gas detection near the first side surface 421 and / or the second side surface 422.

[0171] According to some embodiments of the present application, at least one optical fiber 83 is wound around the periphery of the battery cell group 4 , and the periphery of the optical fiber 83 is coated with a bending buffer layer.

[0172] The bending buffer layer is coated on the surface of the optical fiber 83. The bending buffer layer has certain bending resistance and tensile strength, thereby reducing the probability of problems such as reduced signal transmission capability or breakage of the optical fiber 83 due to stress.

[0173] Optionally, the bending buffer layer may have a certain shock-absorbing and buffering capability, thereby reducing the probability of the optical fiber 83 being broken during vibration.

[0174] By coating the outer periphery of the optical fiber 83 with a bending buffer layer, the bending buffer layer can be used to protect the optical fiber 83 wound around the outer periphery of the battery cell group 4, thereby improving the strength of the optical fiber gas detection assembly 3 and further improving the stability of gas detection.

[0175] According to some embodiments of the present application, the bending buffer layer may include a polyimide film. The polyimide film has excellent thermal stability, chemical corrosion resistance, and mechanical properties, and has high bending strength, small creep, and high tensile strength, thereby protecting the optical fiber 83.

[0176] At least one optical fiber 83 of the fiber optic gas detection assembly 3 can be fixed to the outer periphery of the battery cell group 4 or to the housing 10a using adhesive. For example, the optical fiber 83 can be attached to the surface of the housing 10a near the storage space 13a using adhesive. This fixes the fiber optic gas detection assembly 3 relative to the battery 100a, reducing the range of movement of the optical fiber 83 within the storage space 13a and improving the stability of the optical fiber 83. Furthermore, fixing the optical fiber 83 relative to the battery 100a also helps maintain the distance between the gas detection position 31 and the battery cell group 4, thereby making the data measured in the gas detection area more stable and accurate.

[0177] Optionally, the fixing glue may be glue or tape, such as light-cured UV glue (ultraviolet light-cured glue) or a fixing tape dedicated to the optical fiber 83 .

[0178] Optionally, the optical fiber 83 may also be fixed by a fixing member such as an optical fiber clip provided in the accommodating space 13a.

[0179] The optical fiber 83 and the battery 100 a are relatively fixed by using fixing glue, which can achieve a better fixing effect by using the fixing glue with lower cost, thereby improving the stability of the optical fiber gas detection component 3.

[0180] According to some embodiments of the present application, palladium or palladium alloy sensitive materials may be coated on the optical fiber 83 at multiple locations spaced apart from each other to form multiple gas detection locations 31 on the optical fiber 83 for detecting the concentration of hydrogen.

[0181] Palladium or palladium alloy sensitive materials can specifically absorb hydrogen. Therefore, the changes in the electrical properties of palladium or palladium alloy sensitive materials after hydrogen absorption can be used to selectively detect hydrogen. Specifically, the detection results can include the presence and concentration of hydrogen in the atmosphere.

[0182] Optionally, when the optical fiber 83 is coated with a bending buffer layer, the position on the optical fiber 83 where the palladium or palladium alloy sensitive material is coated is not provided with a bending buffer layer, or the gas can pass through the bending buffer layer coated at that position and contact the palladium or palladium alloy sensitive material, thereby making the contact between the palladium or palladium alloy sensitive material and the gas unaffected, thereby achieving the purpose of specific detection of hydrogen while protecting the optical fiber 83.

[0183] Optionally, gas-sensitive materials for specific detection of other gases may be coated on the optical fiber 83 at multiple, spaced locations. The gas-sensitive materials may be inorganic gas-sensitive materials, organic gas-sensitive materials, or organic / inorganic composite gas-sensitive materials. Inorganic gas-sensitive materials may include metal oxide materials such as tin oxide and zinc oxide; organic gas-sensitive materials may include conductive polymers such as polyaniline, polythiophene, polypyrrole, and their derivatives; and organic / inorganic gas-sensitive materials may include phthalocyanine-based materials, polyaniline-based materials, and polymer conductive filler composite materials.

[0184] By forming a plurality of gas detection locations 31 using palladium or palladium alloy sensitive materials provided on the optical fiber 83 , the characteristics of the palladium or palladium alloy sensitive materials can be utilized to specifically detect the hydrogen concentration nearby.

[0185] According to some embodiments of the present application, referring to FIG. 6 , FIG. 6 is a schematic diagram of the structure of an electrical device according to one or more embodiments. Battery 100a includes a light source 5 and a demodulation module 61 , which are disposed on housing 10a . Light source 5 is coupled to at least one optical fiber 83 , configured to input detection light into at least one optical fiber 83 . Demodulation module 61 is coupled to at least one optical fiber 83 , configured to receive feedback light outputted by at least one optical fiber 83 and demodulate the feedback light to obtain a concentration measurement signal corresponding to each gas detection location 31 .

[0186] The light source 5 is used to input an optical signal into the optical fiber 83 and is an indispensable signal source for detecting gas using the optical fiber gas detection assembly 3. The light source 5 can be a stable light source, a white light source, or a visible light source, and the light-emitting device used can be a light-emitting diode, a laser diode, a halogen lamp, or a laser. Demodulation refers to the process of converting the optical signal transmitted in the optical fiber 83 into a digital signal. The demodulation module 61 can be coupled to at least one optical fiber 83 using a receiving end to receive feedback light output by at least one optical fiber 83, thereby converting the feedback light from an optical signal to a digital signal to obtain a concentration measurement signal.

[0187] Optionally, the demodulation module 61 can be specifically provided in the optical fiber modem 6, and the optical fiber modem 6 can further include a modulation module 62. The modulation module 62 is configured to modulate the light emitted by the light source 5 using a digital signal, and input the modulated optical signal into the at least one optical fiber 83 using a transmitting end coupled to the at least one optical fiber 83.

[0188] By setting up the demodulation module 61 and the light source 5, the light source 5 can be used to input an optical signal into the optical fiber 83, and the demodulation module 61 can be used to demodulate the optical signal into a digital signal, so that the concentration measurement signal of the gas corresponding to each gas detection position 31 can be effectively obtained, thereby facilitating the acquisition of the gas concentration of each gas detection position 31.

[0189] According to some embodiments of the present application, referring to FIG. 6 , the battery 100 a further includes a processor 7 , which is coupled to the demodulation module 61 and configured to receive a concentration measurement signal and obtain the gas concentration measured at each gas detection position 31 based on the concentration measurement signal.

[0190] The demodulation module 61 is coupled to the processor 7, thereby inputting the concentration measurement signal obtained after demodulating the feedback light into the processor 7. The processor 7 can use the different characteristics of the received concentration measurement signal to determine the gas concentration measured at each gas detection position 31. For example, the processor 7 determines which gas detection position 31 measured the concentration measurement signal based on the time difference between receiving the concentration measurement signal, thereby corresponding the gas concentration to the position in the battery 100a.

[0191] Optionally, the processor 7 can control the light source 5 to input detection light into the optical fiber 83 and control the demodulation module 61 to demodulate the output feedback light, thereby obtaining a real-time concentration measurement signal, thereby enabling real-time monitoring of the gas concentration within the battery 100a. The processor 7 can obtain multiple concentration measurement signals for the same gas detection location 31, thereby determining the changing trend of the gas concentration near the gas detection location 31.

[0192] By providing a processor 7 coupled to the demodulation module 61 , the concentration measurement signal can be effectively used to calculate the gas concentration measured at each gas detection position 31 .

[0193] According to some embodiments of the present application, the processor 7 is configured to generate a gas concentration distribution map of the battery 100 a according to the position of each gas detection position 31 in the accommodating space 13 a and the corresponding gas concentration.

[0194] The gas concentration distribution map is generated by processor 7 using the concentration measurement signals and a map of the locations of the gas detection locations 31 in battery 100 a. The map can be used to identify the gas concentrations at each location in battery 100 a where a gas detection location 31 is located. The map must include the actual location of each gas detection location 31 in battery 100 a and the concentration of the preset gas measured at each gas detection location 31.

[0195] Optionally, the processor 7 may use the gas concentrations measured at different times at the gas detection position 31 to update the gas concentration distribution map in real time, so as to timely grasp the changes in the gas in the battery 100a.

[0196] Optionally, the gas concentration distribution graph may be displayed by a display device connected to the processor 7 , so that a user can view the gas concentration distribution graph through the display device to understand the concentration of a preset gas in the battery 100 a .

[0197] Optionally, the gas concentration distribution diagram can be rendered by the processor 7 based on the structural diagram of the battery 100a using the gas concentration conditions at each gas detection position 31. The structural diagram of the battery 100a can also be a three-dimensional model of the battery 100a.

[0198] Optionally, the gas concentration distribution diagram may also include information such as the type of preset gas, the time when the concentration measurement signal is obtained, the gas concentration change trend at the gas detection position 31, the charge and discharge status of the battery 100a and / or the thermal runaway condition calculated based on the gas concentration.

[0199] By using the processor 7 to generate a gas concentration distribution map, the gas concentration distribution of the battery 100a can be intuitively presented in the gas concentration distribution map, which is convenient for monitoring the gas concentration in the battery 100a and determining whether the battery 100a has thermal runaway according to the change in gas concentration.

[0200] According to some embodiments of the present application, the processor 7 is configured to determine whether an abnormality occurs in the battery 100 a based on the gas concentrations measured at the multiple gas detection positions 31 , and to execute corresponding early warning measures if an abnormality occurs.

[0201] Processor 7 uses a preset algorithm to calculate the gas concentrations measured at multiple gas detection locations 31 to determine whether there are areas within battery 100a experiencing abnormal changes in gas concentration, and further, to determine whether an abnormality has occurred at any location within battery 100a. Early warning measures may include processor 7 displaying information about an abnormality within battery 100a on a gas concentration distribution map and / or processor 7 sending a notification indicating an abnormality within battery 100a to a device external to battery 100a. The preset algorithm may determine whether gas composition, gas concentration, and gas concentration change trends meet standards.

[0202] Optionally, the processor 7 may indicate the area with abnormal gas concentration in the battery 100a and / or the basis for determining the abnormal gas concentration on the gas concentration distribution diagram, so as to facilitate inspection and repair of the abnormal location of the battery 100a.

[0203] By determining whether battery 100a has an abnormality and executing corresponding warning measures when an abnormality occurs, the condition of battery 100a can be determined based on gas concentration, and a timely warning can be issued when an abnormality occurs, thereby improving the stability of battery 100a.

[0204] According to some embodiments of the present application, the light source 5 and the demodulation module 61 are arranged on the same circuit board, the circuit board is arranged in the housing 10a, and is located outside the housing 10a; the optical fiber gas detection assembly 3 also includes a transmission connector 32, which is coupled to at least one optical fiber 83; the transmission connector 32 is passed through the housing 10a, the light source 5 and the demodulation module 61 are coupled to the transmission connector 32, the light source 5 inputs detection light to at least one optical fiber through the transmission connector 32, and the demodulation module 61 receives feedback light through the transmission connector 32.

[0205] The circuit board can be a circuit board of the fiber optic modem 6, so that the fiber optic modem 6 can be used to input optical signals to the optical fiber 83 and output digital signals to the processor 7. The light source 5 and the demodulation module 61 can be coupled to the transmission connector 32 using an optical fiber jumper 84.

[0206] By utilizing the light source 5 and the demodulation module 61 on the same circuit board to input light into and receive light from the optical fiber 83 , the gas detection position 31 on the optical fiber 83 can detect gas.

[0207] According to some embodiments of the present application, referring to FIG6 , an electrical device 1b is provided, comprising the aforementioned battery 100a. With this arrangement, fiber optic gas detection assemblies 3 can be deployed in a distributed, multi-point manner within battery 100a, enabling relatively accurate and comprehensive monitoring of the gas within battery 100a, thereby improving the stability and reliability of the electrical device 1b.

[0208] According to some embodiments of the present application, the electrical device 1b includes a light source 5 and a demodulation module 61, the light source 5 is coupled to at least one optical fiber 83, and is used to input detection light into at least one optical fiber 83; the demodulation module 61 is coupled to at least one optical fiber 83, and is used to receive feedback light output by at least one optical fiber 83, and demodulate the feedback light to obtain a concentration measurement signal corresponding to each gas detection position 31.

[0209] By setting a light source 5 and a demodulation module 61 in the electrical device 1b, the light source 5 can be used to input an optical signal into the optical fiber 83, and the demodulation module 61 can be used to demodulate the optical signal into a digital signal, so that the concentration measurement signal of the gas corresponding to each gas detection position 31 can be effectively obtained, thereby facilitating the acquisition of the gas concentration of each gas detection position 31.

[0210] According to some embodiments of the present application, the electrical device 1b further includes a processor 7, which is coupled to the demodulation module 61 and configured to receive the concentration measurement signal and obtain the gas concentration measured at each gas detection location 31 based on the concentration measurement signal. By providing the processor 7 coupled to the demodulation module 61, the concentration measurement signal can be effectively used to calculate the gas concentration measured at each gas detection location 31.

[0211] According to some embodiments of the present application, processor 7 is configured to generate a gas concentration distribution map for battery 100a based on the location of each gas detection location 31 on battery 100a and the corresponding gas concentration. By using processor 7 to generate the gas concentration distribution map, the gas concentration distribution of battery 100a can be intuitively presented on the gas concentration distribution map, facilitating monitoring of the gas concentration within battery 100a and determining whether thermal runaway has occurred in battery 100a based on changes in the gas concentration.

[0212] According to some embodiments of the present application, processor 7 is configured to determine whether battery 100a has an abnormality based on the gas concentrations measured at multiple gas detection locations 31, and to execute corresponding early warning measures if an abnormality occurs. By determining whether battery 100a has an abnormality and executing corresponding early warning measures when an abnormality occurs, the condition of battery 100a can be determined based on gas concentrations, and timely early warnings can be issued when an abnormality occurs, thereby improving the stability of battery 100a.

[0213] In summary, the embodiments of the present application can achieve the goal of detecting the preset gas in the accommodating space 13a by arranging the optical fiber gas detection assembly 3 in the accommodating space 13a in the shell 10a of the battery 100a, and arranging multiple gas detection positions 31 on at least one optical fiber 83 at intervals on the periphery of the battery cell group 4. Compared with setting up multiple independent gas sensors, it can save costs; at the same time, at least four gas detection positions 31 are not in the same plane, so the distributed setting of the gas detection positions 31 can be realized, the gas detection range can be expanded, the probability of misdetection and missed detection due to too few gas sensors can be reduced, and the accuracy and comprehensiveness of gas detection can be improved.

[0214] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: A housing having a receiving space; A battery cell group, comprising a top, a peripheral side and a bottom, wherein the top and the bottom are arranged opposite to each other, the peripheral side is connected between the top and the bottom, and the battery cell group is arranged in the accommodation space; An optical fiber gas detection component is arranged in the accommodating space, and the optical fiber gas detection component includes at least one optical fiber, and the at least one optical fiber has multiple gas detection positions, and the multiple gas detection positions include at least one first gas detection position and at least one second gas detection position, and the at least one first gas detection position is arranged corresponding to at least one of the top and the bottom, and the at least one second gas detection position is arranged corresponding to the peripheral side; the gas detection position is used to detect a preset gas in the accommodating space; at least four of the gas detection positions are not in the same plane.

2. The battery according to claim 1, characterized in that The battery cell group includes at least one battery cell, and each of the battery cells is provided with an explosion-proof valve for internal pressure relief in an area corresponding to the top, and the explosion-proof valve is used to spray gas above the top during operation; the at least one first gas detection position is arranged opposite to the top and is located above the top.

3. The battery according to claim 2, characterized in that The number of the at least one first gas detection position is greater than or equal to the number of the at least one battery cell.

4. The battery according to claim 2, characterized in that Each of the first gas detection positions is arranged opposite to the top and is located above the explosion-proof valve of one of the battery cells.

5. The battery according to claim 2, characterized in that The number of the at least one battery cell is multiple, the number of the at least one first gas detection position is multiple, each of the first gas detection positions is arranged opposite to the top and is located above the middle area of ​​the explosion-proof valve of each two adjacent battery cells.

6. The battery according to claim 2, characterized in that There are multiple battery cells, and the multiple battery cells are arranged along a preset arrangement direction. There are multiple first gas detection positions, and the multiple first gas detection positions are arranged at intervals along the preset arrangement direction.

7. The battery according to claim 2, characterized in that: The number of the at least one first gas detection position is multiple, and the number of the at least one second gas detection position is multiple; the extension length of the optical fiber segment between each two adjacent first gas detection positions is smaller than the extension length of the optical fiber segment between each two adjacent second gas detection positions.

8. The battery according to claim 2, characterized in that A ratio of the number of the at least one first gas detection position to the area of ​​the top portion is greater than a ratio of the number of the at least one second gas detection position to the area of ​​the peripheral side.

9. The battery according to claim 8, characterized in that The multiple gas detection positions also include at least one third gas detection position arranged at the bottom; the ratio of the number of the at least one third gas detection position to the area of ​​the bottom is smaller than the ratio of the number of the at least one second gas detection position to the area of ​​the peripheral side.

10. The battery according to claim 2, characterized in that The number of the at least one second gas detection position is multiple and divided into at least two groups, and the second gas detection positions of each group are arranged at intervals along the circumference of the battery cell group; at least two groups of the second gas detection positions are arranged at intervals along the direction from the top to the bottom; at least two groups of the second gas detection positions are arranged at intervals along the direction from the top to the bottom; In the embodiment, the number of the second gas detection positions in a group close to the top is greater than the number of the second gas detection positions in a group close to the bottom.

11. The battery according to claim 10, characterized in that In a group of the second gas detection positions close to the top, the extension length of the optical fiber section between each two adjacent second gas detection positions is a first extension length; In a group of the second gas detection positions close to the bottom, the extension length of the optical fiber section between each two adjacent second gas detection positions is a second extension length; The first extension length is less than the second extension length.

12. The battery according to claim 2, characterized in that The battery cell has an assembly connection position, and the plurality of gas detection positions include at least one fourth gas detection position, and the at least one fourth gas detection position is arranged corresponding to the assembly connection position.

13. The battery according to claim 12, characterized in that The assembly connection position includes a weld or an assembly gap.

14. The battery according to claim 12, characterized in that The battery cell includes a shell with an open end, an end plate and an electrode assembly, wherein the electrode assembly is arranged inside the shell through the open end, the end plate is arranged at the open end and is assembled and connected to the shell, and the assembly connection position is provided between the end plate and the shell.

15. The battery according to claim 2, characterized in that The battery cell is provided with a liquid injection hole, and the liquid injection hole is used to inject electrolyte into the interior of the battery cell; the multiple gas detection positions include at least one fifth gas detection position; and the at least one fifth gas detection position is arranged corresponding to the liquid injection hole.

16. The battery according to claim 2, characterized in that The peripheral side includes two first side surfaces and two second side surfaces, the two first side surfaces are arranged opposite to each other, and the two second side surfaces are arranged opposite to each other and are respectively connected to the two first side surfaces; the area of ​​the first side surface is greater than the area of ​​the second side surface; At least some of the second gas detection positions are arranged in an array on at least one of the two first side surfaces; and / or at least some of the second gas detection positions are arranged in an array on at least one of the two second side surfaces.

17. The battery according to claim 1, characterized in that The at least one optical fiber is wound around the outer periphery of the battery cell group, and the outer periphery of the optical fiber is coated with a bending buffer layer.

18. The battery according to claim 17, characterized in that The bending buffer layer includes a polyimide film; and / or the at least one optical fiber is fixed to the outer periphery of the battery cell group or to the surface of the shell close to the accommodating space by fixing glue.

19. The battery according to claim 1, characterized in that The optical fiber is coated with palladium or palladium alloy sensitive materials at multiple positions spaced apart from each other, so as to form multiple gas detection positions for detecting the concentration of hydrogen on the optical fiber.

20. The battery according to claim 1, characterized in that The battery includes a light source and a demodulation module, which are arranged on the shell. The light source is coupled to the at least one optical fiber and is used to input detection light to the at least one optical fiber; the demodulation module is coupled to the at least one optical fiber and is used to receive feedback light output by the at least one optical fiber and demodulate the feedback light to obtain a concentration measurement signal corresponding to each of the gas detection positions.

21. The battery according to claim 20, characterized in that The battery further includes a processor, which is coupled to the demodulation module and is configured to receive the concentration measurement signal and obtain the gas concentration measured at each gas detection position according to the concentration measurement signal.

22. The battery according to claim 21, characterized in that The processor is used to generate a gas concentration distribution map of the battery according to the position of each gas detection position in the accommodation space and the corresponding gas concentration.

23. The battery according to claim 21, characterized in that The processor is used to determine whether an abnormality occurs in the battery according to the gas concentrations measured at the multiple gas detection positions, and if an abnormality occurs, execute corresponding early warning measures.

24. The battery according to claim 20, characterized in that The light source and the demodulation module are arranged on the same circuit board, and the circuit board is arranged in the shell and is located outside the shell; the optical fiber gas detection component also includes a transmission connector, and the transmission connector is coupled to the at least one optical fiber; the transmission connector is passed through the shell; the light source and the demodulation module are coupled to the transmission connector, the light source inputs detection light to the at least one optical fiber through the transmission connector, and the demodulation module receives feedback light through the transmission connector.

25. An electrical device, characterized in that: Comprising a battery as described in any one of claims 1-19.

26. The electrical device according to claim 25, characterized in that: The electrical device includes a light source and a demodulation module. The light source is coupled to the at least one optical fiber and is used to input detection light to the at least one optical fiber. The demodulation module is coupled to the at least one optical fiber and is used to receive feedback light output by the at least one optical fiber and demodulate the feedback light to obtain a concentration measurement signal corresponding to each gas detection position.

27. The electrical device according to claim 26, characterized in that: The electrical device further includes a processor, which is coupled to the demodulation module and is configured to receive the concentration measurement signal and obtain the gas concentration measured at each gas detection position according to the concentration measurement signal.

28. The electrical device according to claim 27, characterized in that: The processor is used for generating a gas concentration distribution map of the battery according to the position of each gas detection position on the battery and the corresponding gas concentration.

29. The electrical device according to claim 27, characterized in that: The processor is used to determine whether an abnormality occurs in the battery according to the gas concentrations measured at the multiple gas detection positions, and if an abnormality occurs, execute corresponding early warning measures.

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