Battery, electrical apparatus and auxiliary device

Abstract

Disclosed in the present application are a battery, an electrical apparatus and an auxiliary device, wherein the battery comprises a casing, a battery cell and an optical fiber sensing assembly. The battery cell is accommodated in the casing, and the optical fiber sensing assembly comprises an interface end and an optical fiber coupled with the interface end. The interface end is relatively fixed to the casing, is exposed to the outside and is used for receiving an incident optical signal emitted by an external light source and transmitting the incident optical signal into the optical fiber. The optical fiber is arranged in the casing and located outside the battery cell, and is used for measuring at least one of pressure, temperature and gas in the casing and strain of the battery cell, so as to obtain a detection optical signal. The interface end is further used for being coupled with an external demodulation device, so as to send the detection optical signal fed back by the optical fiber to the external demodulation device, such that the external demodulation device is used for demodulating the detection optical signal to obtain detection information of the optical fiber. In this way, the state in the casing can be detected, thus helping to reduce manufacturing costs of batteries.

Description

Batteries, electrical devices and auxiliary equipment

Technical field

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

[0002] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0003] During the production, transportation, and use of batteries, there is a risk of battery failure. It is necessary to install a sensor component inside the battery to detect battery failures. In existing batteries, the cost of installing a sensor component to detect battery failures is high and needs to be reduced.

[0004] [Summary of the invention]

[0005] In view of the above problems, the present application provides a battery, an electrical device and an auxiliary equipment that can detect the status inside the shell, which is conducive to reducing the manufacturing cost of the battery.

[0006] In a first aspect, the present application provides a battery comprising a housing, a battery cell, and a fiber optic sensing assembly. The battery cell is housed within the housing. The fiber optic sensing assembly comprises an interface end and an optical fiber coupled to the interface end. The interface end is fixed relative to the housing and exposed to the outside world, and is configured to receive an incident light signal emitted by an external light source and transmit the incident light signal to the optical fiber. The optical fiber is disposed within the housing and outside the battery cell, and is configured to detect at least one of the pressure, temperature, and gas within the housing, as well as the strain of the battery cell, to obtain a detection light signal. The interface end is further configured to couple to an external demodulation device to transmit the detection light signal fed back by the optical fiber to the external demodulation device, so that the external demodulation device can demodulate the detection light signal to obtain detection information from the optical fiber. The optical fiber comprises an optical fiber body and a grating disposed on the optical fiber body. The grating is configured to modulate the incident light signal input to the optical fiber body, causing the optical fiber body to generate a detection light signal. The grating is a reflective grating. The interface end has an interface, which is coupled to one end of the optical fiber body. The optical fiber body is configured to receive an incident light signal through an interface and to transmit a detection light signal to an external demodulation device through the interface. Alternatively, the grating is a transmission grating. The interface end has two interfaces, each coupled to the two ends of the optical fiber body. The optical fiber body receives an incident light signal through one of the two interfaces and transmits a detection light signal to an external demodulation device through the other of the two interfaces.

[0007] This approach facilitates detection of the internal state of the housing, thereby monitoring the impact of battery cells on the internal state of the housing. When a battery cell adversely affects the internal state of the housing, timely warnings can be issued and countermeasures can be taken, thereby reducing the risk of battery failure. The fiber optic sensing assembly does not need to demodulate the detection light signal, which helps reduce battery manufacturing costs, reduces the space occupied by the fiber optic sensing assembly within the battery, and improves the battery's energy density.

[0008] The grating has good stability on the optical fiber body. By setting the grating to modulate the incident light signal input to the optical fiber body, it is beneficial to the miniaturization of the optical fiber sensing component and facilitates the installation of the optical fiber sensing component.

[0009] If the grating is a reflection grating, the incident and detection light signals propagate through the fiber, forming a loop that originates from the interface and returns to the interface. This configuration helps save fiber usage. Alternatively, if the grating is a transmission grating, the incident and detection light signals propagate through the fiber, forming a path that originates from one interface and returns to the other. This configuration increases the flexibility of the connection structure between the fiber and external components, facilitating structural layout.

[0010] The optical fiber has a first detection optical fiber segment and a second detection optical fiber segment spaced apart along the extension direction of the optical fiber. The first detection optical fiber segment is used to detect the temperature inside the shell. The second detection optical fiber segment is used to detect the strain of the battery cell. The optical fiber also has a third detection optical fiber segment and a fourth detection optical fiber segment spaced apart along the extension direction of the optical fiber, the third detection optical fiber segment is used to detect the gas inside the shell, and the fourth detection optical fiber segment is used to detect the pressure inside the shell, so that the detection information of the optical fiber can be processed using a decoupling algorithm; wherein, the first detection optical fiber segment is located upstream of the second detection optical fiber segment in the transmission direction of the incident light signal; the second detection optical fiber segment is tightly attached to and fixed to the surface of the battery cell, and the first detection optical fiber segment is spaced apart from the surface of the battery cell.

[0011] Through the above method, it is convenient to perform multi-point detection inside the shell, which is beneficial to obtain more comprehensive status information inside the shell with a smaller number of optical fibers, and is beneficial to reducing the number of optical fibers arranged in the shell and the space occupied, and facilitating the assembly of optical fibers.

[0012] The optical fiber includes at least two sub-fibers fused together front and back, each sub-fiber being used to detect at least one of the pressure, temperature, and gas inside the housing, and the strain of the battery cells. At least two of the sub-fibers have different diameters. The sub-fibers with different diameters have different sensitivities to the pressure, temperature, and gas inside the housing, and the strain of the battery cells. This allows the optical fiber's responses to the pressure, temperature, and gas inside the housing, and the strain of the battery cells to be differentiated, and the pressure, temperature, and gas inside the housing, or the strain of the battery cells, to be calculated using a decoupling algorithm.

[0013] This approach facilitates obtaining more comprehensive status information about the interior of the housing using a smaller number of optical fibers, reduces the number of optical fibers arranged within the housing and the space they occupy, and facilitates assembly of the optical fibers within the housing. This approach also facilitates distinguishing the optical fiber's response to pressure, temperature, and gas or battery cell strain within the housing, reducing interference between the optical fiber's response to pressure, temperature, and gas or battery cell strain within the housing.

[0014] In some embodiments, the first detection fiber segment is located upstream of the second detection fiber segment in the transmission direction of the incident light signal. The second detection fiber segment is closely attached to and fixed to the surface of the battery cell, and the first detection fiber segment is spaced apart from the surface of the battery cell.

[0015] Through the above method, the second detection optical fiber segment can be made more sensitive to the strain generated by the battery cell, which is conducive to timely detecting the changes in the strain of the battery cell and improving the accuracy of the second detection optical fiber segment in detecting the strain of the battery cell. At the same time, it can reduce the interference of the strain of the battery cell on the first detection optical fiber segment in detecting the temperature inside the shell, which is conducive to improving the accuracy of the first detection optical fiber segment in detecting the temperature inside the shell.

[0016] In some embodiments, the optical fiber has a first detection fiber segment and a second detection fiber segment spaced apart along the extension direction of the optical fiber, wherein the first detection fiber segment is disposed outside the battery cell and / or the second detection fiber segment is disposed inside the battery cell.

[0017] The above-mentioned method is helpful to timely detect the changes inside the battery cell, and when adverse changes occur inside the battery cell, it can be discovered and countermeasures can be taken in time.

[0018] In some embodiments, an optical fiber includes a fiber body and a resonant cavity. One end of the fiber body is coupled to the interface end, and the resonant cavity is disposed at the other end of the fiber body. The resonant cavity includes a resonant cavity communicating with the interior of the housing and a reflective membrane disposed within the resonant cavity. The reflective membrane is coated with a sensitive material. The reflective membrane is configured to reflect an incident light signal. The sensitive material coating is configured to modulate the incident light signal by causing the reflective membrane to change in response to a predetermined gas or pressure.

[0019] Through the above method, the optical fiber can be made more sensitive to changes in gas or pressure in the shell, can detect changes in gas or pressure in the shell in a timely manner, and improve the accuracy of optical fiber detection of changes in gas or pressure in the shell.

[0020] In some embodiments, the sensitive material coating comprises palladium, and the sensitive material coating is configured to cause the reflective film to change in response to the concentration of hydrogen gas, so as to modulate the incident light signal.

[0021] By adopting the above method, the optical fiber can be made more sensitive to the change of hydrogen in the shell, and the change of hydrogen concentration in the shell can be detected in time, thereby improving the accuracy of the optical fiber in detecting the change of hydrogen concentration in the shell.

[0022] In some embodiments, the optical fiber includes an optical fiber body and at least one sensitive material coating, wherein the at least one sensitive material coating is respectively coated on the outer circumference of the optical fiber body and is used to change the incident light signal in response to a preset gas to modulate the incident light signal.

[0023] In the above manner, the incident light signal is modulated to obtain a detection light signal carrying detection information reflecting the gas type and concentration, thereby increasing the diversity of detection methods and thus improving detection reliability.

[0024] In some embodiments, the number of optical fibers is at least two, and the at least two optical fibers are arranged side by side, wherein one optical fiber is used to detect the temperature inside the housing, and the other optical fiber is used to detect the strain of the battery cell.

[0025] The above method is conducive to obtaining more comprehensive status information inside the shell and reducing the mutual interference between the strain detection results and the temperature detection results.

[0026] In some embodiments, the optical fiber for detecting the strain of the battery cell is closely attached to and fixed on the surface of the battery cell, and the optical fiber for detecting the temperature inside the housing is spaced apart from the surface of the battery cell.

[0027] Through the above method, the optical fiber used to detect the strain of the battery cell can be made more sensitive to the strain generated by the battery cell, which is conducive to timely detection of changes in the strain of the battery cell. At the same time, it can reduce the interference of the strain of the battery cell on the optical fiber used to detect the temperature inside the shell when detecting the temperature inside the shell, which is conducive to improving the accuracy of the optical fiber used to detect the temperature inside the shell when detecting the temperature inside the shell.

[0028] In some embodiments, the optical fiber includes two fiber cores respectively extending along the extension direction of the optical fiber, and the optical fiber is used to detect at least one of the temperature inside the shell and the strain of the battery cell based on one of the two fiber cores, and to detect at least the other of the temperature inside the shell and the strain of the battery cell based on the other of the two fiber cores.

[0029] In the above manner, by setting two fiber cores to respectively detect the temperature inside the shell and the strain of the battery cell, it is beneficial to obtain more comprehensive status information inside the shell.

[0030] In a second aspect, the present application provides an electrical device comprising the above-mentioned battery.

[0031] In some embodiments, the power-consuming device includes a charging interface portion, the charging interface portion being provided with a charging interface coupled to a battery cell. The charging interface portion includes a docking terminal coupled to the interface terminal, and the charging interface portion is configured to dock with a power supply interface portion of an external device, such that the external device inputs an incident light signal to the interface terminal via the docking terminal, and receives a detection light signal outputted via the interface terminal via the docking terminal.

[0032] Through the above method, the external device can charge the battery cell while obtaining detection information reflecting the status inside the shell through the optical fiber sensing component, which is conducive to taking timely response measures when the status inside the shell is poor, thereby improving the working stability of the battery.

[0033] In some embodiments, the electrical device also includes a processor, which is coupled to a demodulation device. The processor is used to obtain detection information of the optical fiber and, based on the detection information of the optical fiber, derive at least one of the pressure value, temperature value and gas concentration inside the shell and the strain value of the battery cell.

[0034] Through the above method, the processor can process the detection information reflecting the pressure, temperature and gas inside the shell and at least one of the strain of the battery cell, and calculate the pressure value, temperature value and gas concentration inside the shell and at least one of the strain value of the battery cell, thereby improving the accuracy of the detection results.

[0035] In a third aspect, the present application provides an auxiliary device for coupling with the aforementioned battery. The auxiliary device includes a light source and a demodulation device. The light source is configured to input an incident optical signal to an interface end. The demodulation device is configured to receive a detection optical signal transmitted from the interface end and demodulate the detection optical signal to obtain optical fiber detection information.

[0036] In the above manner, the auxiliary device can detect multiple batteries, thereby allowing the battery to not have the demodulation function of the detection light signal, which is beneficial to reducing the manufacturing cost of the battery and improving the energy density of the battery.

[0037] In some embodiments, the auxiliary device is a charging device used to charge the battery. Through the above approach, the charging device can simultaneously charge the battery cells while acquiring detection information reflecting the internal state of the housing through the optical fiber sensing assembly. This facilitates timely response measures when the internal state of the housing is adverse, thereby reducing the risk of the charging process.

[0038] Alternatively, the auxiliary equipment is maintenance equipment, which is used to inspect the battery.

[0039] Through the above method, the maintenance equipment can obtain detection information reflecting the status inside the shell through the optical fiber sensing component, which is convenient for the maintenance equipment to be used to inspect the battery, and is conducive to taking timely response measures when the status inside the shell is poor, thereby reducing the risk of the charging process.

[0040] In some embodiments, the auxiliary device also includes a processor, which is coupled to the demodulation device. The processor is used to obtain detection information of the optical fiber and, based on the detection information of the optical fiber, correspondingly derive at least one of the pressure value, temperature value and gas concentration inside the shell and the strain value of the battery cell.

[0041] 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

[0042] 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:

[0043] FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0044] FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0045] FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0046] FIG4 is a schematic diagram of a working state of an optical fiber sensing assembly according to one or more embodiments;

[0047] FIG5 is a schematic diagram of another working state of the optical fiber sensing assembly according to one or more embodiments;

[0048] FIG6 is a schematic diagram of a resonant cavity modulating an incident light signal according to one or more embodiments;

[0049] FIG7 is another schematic diagram of a resonant cavity modulating an incident light signal according to one or more embodiments;

[0050] FIG8 is another schematic diagram of a resonant cavity modulating an incident light signal according to one or more embodiments;

[0051] FIG9 is a schematic structural diagram of an optical fiber according to one or more embodiments;

[0052] FIG10 is another schematic structural diagram of an optical fiber according to one or more embodiments;

[0053] FIG11 is another schematic structural diagram of an optical fiber according to one or more embodiments;

[0054] FIG12 is a schematic diagram illustrating a coupling structure of an auxiliary device and a battery according to one or more embodiments.

[0055] The reference numerals in the specific embodiments are as follows: 1000a vehicle; 100a battery; 200a controller; 300a motor; 400a charging interface; 401a charging interface; 402a docking end; 10a housing; 11a first portion; 12a second portion; 1 battery cell; 100 housing; 110 receiving shell; 112 opening; 120 end cap; 121 electrode column; 200 electrode assembly; 201 tab; 300 optical fiber sensing assembly; 310 interface end; 311 interface; 320 optical fiber; 321 optical fiber body; 322 grating; 325 first detection optical fiber segment; 326 second detection optical fiber segment; 327 resonant cavity; 328 resonant cavity; 329 reflective film; 3291 first reflective sub-film; 3292 second reflective sub-film; 330 sensitive material coating; 331 fiber core; 332 sub-optical fiber; 501 power supply interface; 600 processor; 700 auxiliary equipment; 701 light source; 702 demodulation equipment. [Specific implementation method]

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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).

[0062] 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.

[0063] 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.

[0064] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0065] During the production, transportation, and use of batteries, there is a risk of battery failure. It is necessary to install a sensor component inside the battery to detect battery failures. In existing batteries, the cost of installing a sensor component to detect battery failures is high and needs to be reduced.

[0066] Promptly issuing warnings and taking countermeasures when a battery cell adversely affects the internal state of the housing can reduce the risks caused by battery problems. To facilitate detection of the internal state of the housing, an optical fiber can be placed inside the housing and outside the battery cell. The optical fiber can detect at least one of the pressure, temperature, and gas inside the housing, as well as the strain of the battery cell, thereby monitoring the impact of the battery cell on the internal state of the housing. This also helps reduce the overall volume and space occupied by the optical fiber sensing assembly, providing more space to accommodate the battery cell, improving space utilization, and thus increasing the volumetric energy density of the battery, making the battery structure more compact. By sending the detection light signal fed back by the optical fiber to an external demodulation device and using the external demodulation device to demodulate the detection light signal, the battery does not need to have the demodulation function of the detection light signal, which helps reduce the manufacturing cost of the battery.

[0067] Based on the above considerations, the present application provides a battery, an electrical device, and an auxiliary device. The battery includes a housing, a battery cell, and a fiber optic sensing assembly. The battery cell is housed within the housing. The fiber optic sensing assembly includes an interface end and an optical fiber coupled to the interface end. The interface end is fixed relative to the housing and exposed to the outside world, and is configured to receive an incident light signal emitted by an external light source and transmit the incident light signal to the optical fiber. The optical fiber is disposed within the housing and outside the battery cell, and is configured to detect at least one of the pressure, temperature, and gas within the housing, as well as the strain of the battery cell, to obtain a detection light signal. The interface end is further configured to couple to an external demodulation device to transmit the detection light signal fed back by the optical fiber to the external demodulation device, so that the external demodulation device can demodulate the detection light signal to obtain detection information from the optical fiber. The optical fiber includes a fiber body and a grating disposed on the fiber body. The grating is configured to modulate the incident light signal input to the fiber body, causing the fiber body to generate a detection light signal. The grating is a reflective grating. The interface end has a connector, which is coupled to one end of the fiber body. The optical fiber body is used to receive an incident light signal through an interface and also to transmit a detection light signal to an external demodulation device through the interface. Alternatively, the grating is a transmission grating. The interface end has two interfaces, each coupled to the two ends of the optical fiber body. The optical fiber body receives an incident light signal through one of the two interfaces and also transmits a detection light signal to an external demodulation device through the other of the two interfaces. This reduces the space occupied by the optical fiber sensing assembly, which helps increase the volumetric energy density of the battery. Furthermore, using an external demodulation device to demodulate the detection light signal helps reduce the manufacturing cost of the battery.

[0068] The batteries, electrical devices, and auxiliary equipment disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery cars, electric cars, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] In some embodiments, the battery 100a may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0073] 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.

[0074] In the embodiment of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell 1 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.

[0075] 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.

[0076] In some embodiments, the battery 100 a may be a battery module. When there are multiple battery cells 1 , the multiple battery cells 1 are arranged and fixed to form a battery module.

[0077] 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 a battery module is housed in the housing 10 a .

[0078] 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.

[0079] Referring to Figures 2 and 3 , battery 100a includes a housing 10a and a battery cell 1, which is housed within the housing 10a. The housing 10a provides a space for the battery cell 1 and can have various structures. In some embodiments, the housing 10a can include a first portion 11a and a second portion 12a, which overlap each other and together define a space for accommodating the battery cell 1. The second portion 12a can be a hollow structure with one end open. The first portion 11a can be a plate-like structure, with the first portion 11a overlapping the open side of the second portion 12a, so that the first and second portions 11a and 12a together define the space. Alternatively, the first and second portions 11a and 12a can each be a hollow structure 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 and second portions 11a and 12a can have various shapes, such as a cylinder or a rectangular parallelepiped.

[0080] In battery 100a, there may be multiple battery cells 1, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 1. Multiple battery cells 1 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure of the multiple battery cells 1 is housed within the housing 10a. Alternatively, battery 100a may comprise a battery module formed by first connecting multiple battery cells 1 in series, in parallel, or in a hybrid configuration, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid configuration to form a single structure housed within the housing 10a. Battery 100a may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 1.

[0081] Referring to Figure 3 , a battery cell 1 is the smallest unit of a battery. In this embodiment, a cylindrical battery cell is used as an example. As shown in Figure 3 , the battery cell 1 includes a housing 100 , an electrode assembly 200 , and other functional components.

[0082] In some embodiments, the housing 100 is used to encapsulate the electrode assembly 200 and the electrolyte and other components. The housing 100 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0083] The outer shell 100 may include an end cover 120 and a containment shell 110. The end cover 120 refers to a component that covers the opening of the containment shell 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cover 120 can be adapted to the shape of the containment shell 110 to match the containment shell 110. Optionally, the end cover 120 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cover 120 is not easily strained when squeezed and collided, so that the battery cell 1 can have a higher structural strength and improved safety performance. Functional components such as electrode columns 121 can be provided on the end cover 120. The electrode column 121 can be used to electrically connect to the electrode assembly 200 for outputting or inputting electrical energy of the battery cell 1. In some embodiments, the end cover 120 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The end cap 120 can also be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component can be disposed inside the end cap 120 to isolate the electrical connection components within the housing 110 from the end cap 120 to reduce the risk of short circuits. Exemplary materials include plastic, rubber, etc.

[0084] The containment shell 110 is a component used to cooperate with the end cap 120 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 200, electrolyte, and other components. The containment shell 110 and the end cap 120 can be independent components. An opening 112 can be provided in the containment shell 110, and the end cap 120 is closed at the opening 112 to form the internal environment of the battery cell 1. Alternatively, the end cap 120 and the containment shell 110 can be integrated. Specifically, the end cap 120 and the containment shell 110 can form a common connection surface before other components are inserted into the shell. When the interior of the containment shell 110 needs to be encapsulated, the end cap 120 is closed over the containment shell 110. The containment shell 110 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the containment shell 110 can be determined based on the specific shape and size of the electrode assembly 200. The material of the housing 110 can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0085] The electrode assembly 200 is a component where electrochemical reactions occur in the battery cell 1. One or more electrode assemblies 200 may be contained in the housing 110.

[0086] In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 1, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0087] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0088] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0089] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0090] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0091] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0092] As an example, the negative electrode current collector may be a metal foil, a metal foam, a carbon foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. may be used. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0093] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0094] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0095] As an example, the negative electrode active material may adopt the negative electrode active material for battery cell 1 that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0096] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0097] In some embodiments, the electrode assembly 200 further includes a separator disposed between the positive electrode and the negative electrode.

[0098] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0099] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0100] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0101] In some embodiments, the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0102] The liquid electrolyte includes an electrolyte salt and a solvent.

[0103] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0104] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0105] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0106] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0107] As an example, the polymer solid electrolyte may be polyether, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, etc. As an example, the polymer solid electrolyte may be polyethylene oxide.

[0108] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0109] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0110] In some embodiments, the electrode assembly 200 is a wound structure in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0111] In some embodiments, the electrode assembly 200 is provided with tabs 201 that conduct current from the electrode assembly 200. Tabs include positive and negative tabs. The positive and negative tabs can be located together at one end of the main body or separately at opposite ends of the main body. During the charge and discharge process of the battery 100a, the positive and negative active materials react with the electrolyte, and the tabs 201 connect to the electrode columns 121 to form a current loop.

[0112] According to some embodiments of the present application, as shown in Figures 1, 2, and 4, a battery 100a described in the battery embodiment of the present application includes a housing 10a, a battery cell 1, and a fiber optic sensing assembly 300. The battery cell 1 is housed within the housing 10a. The fiber optic sensing assembly 300 includes an interface end 310 and an optical fiber 320 coupled to the interface end 310. The interface end 310 is fixed relative to the housing 10a and exposed to the outside world, and is configured to receive an incident light signal emitted by an external light source 701 and transmit the incident light signal to the optical fiber 320. The optical fiber 320 is disposed within the housing 10a and outside the battery cell 1, and is configured to detect at least one of the pressure, temperature, and gas within the housing 10a, as well as the strain of the battery cell 1, to obtain a detection light signal. The interface end 310 is also configured to couple to an external demodulation device 702 to transmit the detection light signal fed back from the optical fiber 320 to the external demodulation device 702, so that the external demodulation device 702 can demodulate the detection light signal to obtain detection information from the optical fiber 320.

[0113] During the use of the battery 100a, the interior of the housing 10a is often in a dynamic state of change. For example, the battery cell 1 may expand in volume, the temperature and pressure inside the housing 10a may change, or gas may be generated inside the housing 10a. The pressure inside the housing 10a may increase due to the generation of gas and the increase in temperature. The optical fiber sensing assembly 300 can be used to obtain status information inside the housing 10a, such as sampling the gas, temperature, strain, or pressure inside the housing 10a, to improve the effectiveness of managing the operating status of the battery 100a.

[0114] The incident light signal can propagate through the optical fiber 320 along the extension direction of the optical fiber 320. During the propagation of the incident light signal, the optical fiber 320 can modulate the incident light signal so that the incident light signal is converted into a detection light signal carrying detection information. The detection information can be used to reflect at least one of the pressure, temperature, and gas inside the shell 10a and the strain of the battery cell 1. For example, the optical fiber 320 can modulate the incident light signal based on the temperature and strain inside the shell 10a so that the incident light signal is converted into a detection light signal carrying temperature and strain detection information. For another example, the optical fiber 320 can modulate the incident light signal based on the gas and pressure inside the shell 10a so that the incident light signal is converted into a detection light signal carrying gas and pressure detection information.

[0115] After the incident light signal is converted into a detection light signal carrying the detection information, the detection light signal can be sent to the external demodulation device 702. The external demodulation device 702 can demodulate the detection light signal to convert the detection light signal into an electrical signal carrying the detection information, thereby facilitating the acquisition and utilization of the detection information.

[0116] By arranging the interface end 310 to be fixed relative to the housing 10a and exposed to the outside world, the incident light signal is stably transmitted from the external light source 701 to the interface end 310, and the interface end 310 is stably connected to the external demodulation device 702. By arranging the optical fiber 320 inside the housing 10a and outside the battery cell 1, the internal state of the housing 10a can be detected, thereby monitoring the impact of the battery cell 1 on the internal state of the housing 10a. If the battery cell 1 has an adverse effect on the internal state of the housing 10a, a timely warning can be issued and countermeasures can be taken, thereby reducing the risk of defects caused by battery 100a.

[0117] The optical fiber sensing assembly 300 may not have the demodulation function of the detection light signal, which is beneficial to reducing the manufacturing cost of the battery 100a, reducing the space occupied by the optical fiber sensing assembly 300 in the battery 100a, and improving the energy density of the battery 100a.

[0118] As shown in FIG4 , the optical fiber 320 includes an optical fiber body 321 and a grating 322 disposed on the optical fiber body 321 . The grating 322 is used to modulate the incident light signal input to the optical fiber body 321 so that the optical fiber body 321 generates a detection light signal.

[0119] The optical fiber 320 grating 322 is a diffraction grating formed by periodically modulating the refractive index of the core 331 of the optical fiber 320 in an axial direction. The provision of the grating 322 on the optical fiber 320 makes the optical fiber 320 more sensitive to changes in the internal state of the housing 10a, thereby enabling the optical fiber 320 to detect at least one of the pressure, temperature, and gas inside the housing 10a, as well as the strain of the battery cell 1. For example, the grating 322 may include a Bragg grating 322.

[0120] The optical fiber body 321 has good compatibility with the grating 322. By providing the grating 322 to modulate the incident light signal input to the optical fiber body 321, it is beneficial to miniaturize the optical fiber sensing assembly 300 and facilitate the installation of the optical fiber sensing assembly 300.

[0121] According to some embodiments of the present application, as shown in FIG4 , grating 322 is optionally a reflective grating. Interface end 310 includes an interface 311 coupled to one end of optical fiber body 321. Optical fiber body 321 is configured to receive an incident optical signal through interface 311 and to transmit a detected optical signal to an external demodulation device 702 through interface 311.

[0122] The reflective grating modulates the incident light signal based on the state inside the housing 10a, converting it into a detection light signal. The resulting detection light signal propagates along the optical fiber 320 in a direction opposite to that of the incident light signal. As a result, the incident light signal and the detection light signal propagate within the optical fiber 320, forming a loop that originates from and returns to the interface 311. This arrangement helps conserve the use of optical fiber 320.

[0123] According to some embodiments of the present application, as shown in FIG5 , the grating 322 is optionally a transmission grating. The interface end 310 has two interfaces 311, each of which is coupled to the ends of the optical fiber body 321. The optical fiber body 321 receives an incident optical signal through one of the two interfaces 311 and transmits a detected optical signal to an external demodulation device 702 through the other of the two interfaces 311.

[0124] The transmission grating modulates the incident light signal based on the state inside housing 10a, converting it into a detection light signal. The resulting detection light signal travels along optical fiber 320 in the same direction as the incident light signal. Consequently, the incident and detection light signals propagate within optical fiber 320, forming a path that originates from one port 311 and returns to the other. This arrangement increases the flexibility of the connection structure between optical fiber 320 and external components, facilitating structural layout.

[0125] According to some embodiments of the present application, as shown in Figures 4 and 5 , the optical fiber 320 optionally includes a first detection optical fiber segment 325 and a second detection optical fiber segment 326 spaced apart along the extension direction of the optical fiber 320. The first detection optical fiber segment 325 is used to detect the temperature inside the housing 10a. The second detection optical fiber segment 326 is used to detect the strain of the battery cell 1.

[0126] By setting the first detection optical fiber segment 325 and the second detection optical fiber segment 326 to respectively detect the temperature inside the shell 10a and the strain of the battery cell 1, it is beneficial to obtain more comprehensive status information inside the shell 10a with a smaller number of optical fibers 320, which is beneficial to reducing the number of optical fibers 320 arranged in the shell 10a and the space occupied, and facilitating the assembly of the optical fibers 320.

[0127] Optionally, the optical fiber 320 may further include a third detection optical fiber segment and a fourth detection optical fiber segment spaced apart along the extension direction of the optical fiber 320 , wherein the third detection optical fiber segment is used to detect gas inside the housing 10a and the fourth detection optical fiber segment is used to detect pressure inside the housing 10a.

[0128] According to some embodiments of the present application, optionally, as shown in FIG2 , the first detection fiber segment 325 is located upstream of the second detection fiber segment 326 in the transmission direction of the incident light signal. The second detection fiber segment 326 is closely attached to and fixed to the surface of the battery cell 1, and the first detection fiber segment 325 is spaced apart from the surface of the battery cell 1.

[0129] By positioning the second detection fiber segment 326 in close contact with and fixed to the surface of the battery cell 1, the second detection fiber segment 326 is more sensitive to the strain generated by the battery cell 1, facilitating timely detection of changes in the strain of the battery cell 1 and improving the accuracy of the second detection fiber segment 326 in detecting the strain of the battery cell 1. By positioning the first detection fiber segment 325 at a distance from the surface of the battery cell 1, the interference of the strain of the battery cell 1 on the temperature within the housing 10a detected by the first detection fiber segment 325 is reduced, thereby improving the accuracy of the first detection fiber segment 325 in detecting the temperature within the housing 10a. Furthermore, the temperature within the housing 10a significantly interferes with the detection results of the optical fiber 320 used to detect the strain of the battery cell 1, while the strain of the battery cell 1 has less interference with the detection results of the optical fiber 320 used to detect the temperature within the housing 10a. A decoupling algorithm can be used to process the detection information of the first and second detection fiber segments 325 and 326, thereby reducing the interference of the temperature within the housing 10a on the strain detection results.

[0130] Furthermore, the temperature inside the shell 10a will cause significant interference to the detection results of the second detection optical fiber segment 326, while the strain of the battery cell 1 will have less interference to the detection results of the first detection optical fiber segment 325. The decoupling algorithm can be used to process the detection information of the two optical fibers 320, thereby reducing the interference of the temperature inside the shell 10a on the detection results of the second detection optical fiber segment 326.

[0131] According to some embodiments of the present application, the optical fiber 320 optionally includes a first detection optical fiber segment 325 and a second detection optical fiber segment 326 spaced apart along the extension direction of the optical fiber 320. The first detection optical fiber segment 325 is disposed outside the battery cell 1, and / or the second detection optical fiber segment 326 is disposed inside the battery cell 1.

[0132] Optical fiber 320 can be inserted into battery cell 1, allowing the outside world to inspect the interior of battery cell 1 through optical fiber 320. By placing second detection optical fiber segment 326 inside battery cell 1, changes within battery cell 1 can be detected promptly, allowing for timely detection and countermeasures when adverse changes occur within battery cell 1.

[0133] According to some embodiments of the present application, as shown in FIG6 , an optical fiber 320 optionally includes an optical fiber body 321 and a resonant cavity 327. One end of the optical fiber body 321 is coupled to the interface end 310, and the resonant cavity 327 is disposed at the other end of the optical fiber body 321. The resonant cavity 327 includes a resonant cavity 328 that communicates with the interior of the housing 10a, and a reflective film 329 disposed within the resonant cavity 328. The reflective film 329 is provided with a sensitive material coating 330. The reflective film 329 is configured to reflect an incident light signal. The sensitive material coating 330 is configured to cause the reflective film 329 to change in response to a preset gas or pressure, thereby modulating the incident light signal. For example, the resonant cavity 328 includes an FP cavity.

[0134] For example, the reflective film 329 can be spaced apart from the other end of the optical fiber body 321. An incident light signal can be emitted from the other end of the optical fiber body 321 and impinge upon the reflective film 329. After reflection from the reflective film 329, the incident light signal is converted into a detection light signal, which can then enter the optical fiber 320 from the other end of the optical fiber body 321. When the sensitive material coating 330 deforms in response to a preset gas or pressure, the distance between the reflective film 329 and the other end of the optical fiber body 321 changes. Based on this, the reflective film 329 can modulate the incident light signal, causing the detection light signal to carry detection information reflecting the gas or pressure.

[0135] Such a configuration can make the optical fiber 320 more sensitive to changes in gas or pressure in the shell 10a, can detect changes in gas or pressure in the shell 10a in a timely manner, and improve the accuracy of the optical fiber 320 in detecting changes in gas or pressure in the shell 10a.

[0136] In some embodiments, as shown in FIG7 , the reflective film 329 includes a first reflective sub-film 3291 and a second reflective sub-film 3292. The first reflective sub-film 3291 is connected to the other end of the optical fiber body 321, and the second reflective sub-film 3292 can be spaced apart from the other end of the optical fiber body 321, thereby forming an FP cavity between the first reflective sub-film 3291 and the second reflective sub-film 3292. A sensitive material coating 330 can be disposed on the second reflective sub-film 3292. When the sensitive material coating 330 deforms in response to a preset gas or pressure, the distance between the second reflective sub-film 3292 and the first reflective sub-film 3291 changes. Based on this, the reflective film 329 can modulate the incident light signal, so that the detection light signal carries detection information reflecting the gas or pressure.

[0137] In some embodiments, as shown in FIG8 , a reflective film 329 is disposed at the other end of the optical fiber body 321. The refractive index of the reflective film 329 changes due to the gas or pressure, thereby modulating the incident light signal so that the detection light signal carries detection information reflecting the gas pressure.

[0138] According to some embodiments of the present application, the sensitive material coating 330 may optionally include palladium, and the sensitive material coating 330 is configured to change the reflective film 329 in response to the concentration of hydrogen gas to modulate the incident light signal. For example, the sensitive material coating 330 may include a palladium alloy.

[0139] Such a configuration can make the optical fiber 320 more sensitive to changes in hydrogen in the housing 10a and can promptly detect changes in hydrogen concentration in the housing 10a, thereby improving the accuracy of the optical fiber 320 in detecting changes in hydrogen concentration in the housing 10a.

[0140] During the production, transportation, and use of battery 100a, there is a risk of thermal runaway. Thermal runaway of battery 100a refers to the release of large amounts of heat energy from battery 100a through combustion, explosion, or other means. Before or in the initial stages of thermal runaway, hydrogen gas inside battery cell 1 may be released to the outside of battery cell 1 within housing 10a. By providing a sensitive material coating 330 that changes reflective film 329 in response to hydrogen concentration, the hydrogen concentration within housing 10a is detected. When the hydrogen concentration rises, an early warning of the risk of thermal runaway can be issued. This facilitates timely countermeasures before or in the initial stages of thermal runaway, thereby reducing the probability of thermal runaway and the hazards caused by it. For example, measures such as power outage and injection of flame retardant can be used to reduce the probability of thermal runaway and the hazards caused by it.

[0141] According to some embodiments of the present application, optionally, as shown in Figure 5, the optical fiber 320 includes an optical fiber body 321 and at least one sensitive material coating 330, and the at least one sensitive material coating 330 is respectively coated on the outer periphery of the optical fiber body 321, and is used to change the incident light signal in response to a preset gas to modulate the incident light signal.

[0142] Each sensitive material coating 330 can respond to a corresponding preset gas, thereby modulating the incident light signal to produce a detection light signal that carries detection information reflecting the gas type and concentration. Specifically, the optical fiber body 321 is provided with a grating 322, and the sensitive material coating 330 can be coated around the periphery of the grating 322. The sensitive material coating 330 can deform in response to the corresponding preset gas, causing the optical performance parameters of the grating 322 to change accordingly, thereby achieving modulation of the incident light signal. For example, the preset gas is hydrogen, carbon monoxide, etc.

[0143] According to some embodiments of the present application, optionally, the number of optical fibers 320 is at least two, and at least two optical fibers 320 are arranged side by side, wherein one optical fiber 320 is used to detect the temperature inside the shell 10a, and the other optical fiber 320 is used to detect the strain of the battery cell 1.

[0144] By providing at least two optical fibers 320 to respectively detect the temperature inside the housing 10a and the strain of the battery cells 1, more comprehensive information about the internal state of the housing 10a is obtained, and interference between strain and temperature detection results is reduced. Placing at least two optical fibers 320 side by side facilitates the arrangement of the optical fibers 320 within the housing 10a and facilitates assembly of the optical fibers 320.

[0145] Furthermore, one of the optical fibers 320 may be provided with a sensitive material for detecting the temperature inside the shell 10a or the strain of the battery cell 1, and the other optical fiber 320 may not be provided with a sensitive material. The detection information of the two optical fibers 320 may be processed using a decoupling algorithm, thereby reducing the interference of the temperature inside the shell 10a on the strain detection results, or reducing the interference of the strain of the battery cell 1 on the temperature detection results.

[0146] According to some embodiments of the present application, optionally, the optical fiber 320 for detecting the strain of the battery cell 1 is closely attached to and fixed on the surface of the battery cell 1 , and the optical fiber 320 for detecting the temperature inside the housing 10a is spaced apart from the surface of the battery cell 1 .

[0147] By positioning the optical fiber 320 for detecting the strain of the battery cell 1 in close contact with and fixed to the surface of the battery cell 1, the optical fiber 320 for detecting the strain of the battery cell 1 can be made more sensitive to the strain generated by the battery cell 1, thereby facilitating timely detection of changes in the strain of the battery cell 1 and improving the accuracy of the optical fiber 320 for detecting the strain of the battery cell 1. By positioning the optical fiber 320 for detecting the temperature inside the housing 10a at a distance from the surface of the battery cell 1, interference caused by the strain of the battery cell 1 on the temperature inside the housing 10a detected by the optical fiber 320 for detecting the temperature inside the housing 10a can be reduced, thereby improving the accuracy of the optical fiber 320 for detecting the temperature inside the housing 10a.

[0148] Furthermore, the temperature inside the shell 10a will cause significant interference to the detection results of the optical fiber 320 used to detect the strain of the battery cell 1, while the strain of the battery cell 1 will have less interference with the detection results of the optical fiber 320 used to detect the temperature inside the shell 10a. The decoupling algorithm can be used to process the detection information of the two optical fibers 320, thereby reducing the interference of the temperature inside the shell 10a on the strain detection results.

[0149] According to some embodiments of the present application, optionally, as shown in Figures 2 and 9, the optical fiber 320 includes two fiber cores 331 respectively extending along the extension direction of the optical fiber 320, and the optical fiber 320 is used to detect at least one of the temperature inside the shell 10a and the strain of the battery cell 1 based on one of the two fiber cores 331, and to detect at least the other of the temperature inside the shell 10a and the strain of the battery cell 1 based on the other of the two fiber cores 331.

[0150] By providing two fiber cores 331 to respectively detect the temperature inside the housing 10a and the strain of the battery cell 1, it is advantageous to obtain more comprehensive status information inside the housing 10a. By configuring the optical fiber 320 to include two fiber cores 331 extending along the extension direction of the optical fiber 320, it is convenient to arrange the optical fiber 320 within the housing 10a and facilitate the assembly of the optical fiber 320.

[0151] According to some embodiments of the present application, optionally, as shown in Figures 2 and 10, the optical fiber 320 includes at least two sub-optical fibers 332 fused front and back, and each sub-optical fiber 332 is used to detect at least one of the pressure, temperature and gas inside the shell 10a and the strain of the battery cell 1.

[0152] Different sub-optical fibers 332 can be configured to have different sensitivities to the pressure, temperature, and gas inside the housing 10a, as well as the strain of the battery cell 1. Thus, at least two sub-optical fibers 332 spliced ​​front to back can be used to detect at least two of the following: the pressure, temperature, and gas inside the housing 10a, and the strain of the battery cell 1. For example, the optical fiber 320 includes two sub-optical fibers 332 spliced ​​front to back, and the two sub-optical fibers 332 can be used to detect the pressure and temperature inside the housing 10a, respectively. For another example, the optical fiber 320 includes four sub-optical fibers 332 spliced ​​front to back, and the four sub-optical fibers 332 can be used to detect the pressure, temperature, and gas inside the housing 10a, as well as the strain of the battery cell 1, respectively.

[0153] For example, different sub-optical fibers 332 may be provided with different Bragg gratings 322 , so that different sub-optical fibers 332 have different sensitivities to the pressure, temperature, and gas inside the housing 10 a and the strain of the battery cell 1 .

[0154] Such a configuration is conducive to obtaining more comprehensive status information inside the housing 10a with a smaller number of optical fibers 320, which is conducive to reducing the number of optical fibers 320 arranged in the housing 10a and the space occupied, and facilitating the assembly of the optical fibers 320 in the housing 10a.

[0155] According to some embodiments of the present application, optionally, as shown in FIG. 2 and FIG. 10 , at least two of the sub-optical fibers 332 have different diameters.

[0156] Different sub-optical fibers 332 can be set to have different sensitivities to the pressure, temperature and gas inside the shell 10a and the strain of the battery cell 1. By setting the diameters of the sub-optical fibers 332 to be different, it is helpful to distinguish the responses of the optical fiber 320 to the pressure, temperature and gas inside the shell 10a or the strain of the battery cell 1, and to facilitate the use of a decoupling algorithm to calculate the pressure, temperature and gas inside the shell 10a or the strain of the battery cell 1, thereby reducing the interference between the responses of the optical fiber 320 to the pressure, temperature and gas inside the shell 10a or the strain of the battery cell 1.

[0157] Optionally, as shown in FIG2 and FIG11 , at least two sub-optical fibers 332 have the same diameter but are staggered and fused. This arrangement is advantageous for distinguishing the response of the optical fiber 320 to the pressure, temperature and gas inside the housing 10a or the strain of the battery cell 1.

[0158] According to some embodiments of the present application, as shown in Figures 3 to 10 , a battery 100a optionally includes a housing 10a, a battery cell 1, and a fiber optic sensing assembly 300. The battery cell 1 is housed within the housing 10a. The fiber optic sensing assembly 300 includes an interface end 310 and an optical fiber 320 coupled to the interface end 310. The interface end 310 is fixed relative to the housing 10a and exposed to the outside world, and is configured to receive an incident light signal emitted by an external light source 701 and transmit the incident light signal to the optical fiber 320. The optical fiber 320 is disposed within the housing 10a and outside the battery cell 1, and is configured to detect at least one of the pressure, temperature, and gas within the housing 10a, as well as the strain of the battery cell 1, to obtain a detection light signal. The interface end 310 is also configured to couple to an external demodulation device 702 to transmit the detection light signal fed back by the optical fiber 320 to the external demodulation device 702, so that the external demodulation device 702 can demodulate the detection light signal to obtain detection information from the optical fiber 320. The optical fiber 320 includes a fiber body 321 and a grating 322 disposed on the fiber body 321. The grating 322 is used to modulate the incident light signal input to the fiber body 321, causing the fiber body 321 to generate a detection light signal. The grating 322 is a reflection grating. The interface end 310 has an interface 311 coupled to one end of the fiber body 321. The fiber body 321 is used to receive the incident light signal through the interface 311 and also to transmit the detection light signal to an external demodulation device 702 through the interface 311. Alternatively, the grating 322 is a transmission grating. The interface end 310 has two interfaces 311, one coupled to each end of the fiber body 321. The fiber body 321 receives the incident light signal through one of the two interfaces 311 and also transmits the detection light signal to the external demodulation device 702 through the other of the two interfaces 311. The optical fiber 320 includes a first detection fiber segment 325 and a second detection fiber segment 326 spaced apart along the extension direction of the optical fiber 320. The first detection fiber segment 325 is used to detect the temperature inside the housing 10a. The second detection fiber segment 326 is used to detect strain in the battery cell 1. The first detection fiber segment 325 is located upstream of the second detection fiber segment 326 in the transmission direction of the incident light signal. The second detection fiber segment 326 is closely attached to and fixed to the surface of the battery cell 1, with the first detection fiber segment 325 spaced apart from the surface of the battery cell 1. The optical fiber 320 includes a first detection fiber segment 325 and a second detection fiber segment 326 spaced apart along the extension direction of the optical fiber 320. The first detection fiber segment 325 is disposed outside the battery cell 1, and / or the second detection fiber segment 326 is disposed inside the battery cell 1. The optical fiber 320 includes an optical fiber body 321 and a resonant cavity 327. One end of the optical fiber body 321 is coupled to the interface end 310, and the resonant cavity 327 is disposed at the other end of the optical fiber body 321.The resonant cavity 327 has a resonant cavity 328 connected to the interior of the housing 10a and a reflective film 329 disposed within the resonant cavity 328. A sensitive material coating 330 is disposed on the reflective film 329. The reflective film 329 is configured to reflect an incident light signal. The sensitive material coating 330 is configured to cause the reflective film 329 to change in response to a preset gas or pressure, thereby modulating the incident light signal. The sensitive material coating 330 includes palladium and is configured to cause the reflective film 329 to change in response to the concentration of hydrogen, thereby modulating the incident light signal. The optical fiber 320 includes an optical fiber body 321 and at least one sensitive material coating 330. The at least one sensitive material coating 330 is respectively coated on the outer periphery of the optical fiber body 321 and is configured to cause the incident light signal to change in response to a preset gas, thereby modulating the incident light signal. There are at least two optical fibers 320, arranged side by side. One optical fiber 320 is used to detect the temperature inside the housing 10a, and the other optical fiber 320 is used to detect the strain of the battery cell 1. The optical fiber 320 for detecting the strain of the battery cell 1 is closely attached to and fixed to the surface of the battery cell 1, while the optical fiber 320 for detecting the temperature inside the housing 10a is spaced apart from the surface of the battery cell 1. The optical fiber 320 includes two fiber cores 331 extending along the extension direction of the optical fiber 320. The optical fiber 320 is used to detect at least one of the temperature inside the housing 10a and the strain of the battery cell 1 based on one of the two fiber cores 331, and to detect at least the other of the temperature inside the housing 10a and the strain of the battery cell 1 based on the other of the two fiber cores 331. The optical fiber 320 includes at least two sub-optical fibers 332 fused together. Each sub-optical fiber 332 is used to detect at least one of the pressure, temperature, and gas inside the housing 10a, and the strain of the battery cell 1. At least two of the sub-optical fibers 332 have different diameters.

[0159] According to some embodiments of the present application, as shown in FIG1 , an electrical device includes the aforementioned battery 100a. With this configuration, the operating state of the electrical device can be reasonably adjusted based on the detected operating state of the battery 100a, such that the operating state of the electrical device matches the operating state of the battery 100a, thereby improving the operating stability of the electrical device.

[0160] According to some embodiments of the present application, optionally, as shown in Figures 1, 2, and 4, the power-consuming device includes a charging interface portion 400a, which is provided with a charging interface 401a, and the charging interface 401a is coupled to the battery cell 1. The charging interface portion 400a includes a docking terminal 402a, which is coupled to the interface terminal 310. The charging interface portion 400a is used to dock with the power supply interface portion 501 of an external device, so that the external device can input an incident light signal to the interface terminal 310 through the docking terminal 402a, and receive a detection light signal outputted via the interface terminal 310 through the docking terminal 402a.

[0161] The power supply interface 501 is used to output electrical energy. External devices can charge the battery cell 1 through the power supply interface 501 and the charging interface 400a. Specifically, the charging interface 401a can be connected to both an external device and a battery cell 1, allowing the external device to charge the battery cell 1. By simultaneously providing the docking terminal 402a and the interface terminal 310 on the charging interface 400a, the external device can simultaneously charge the battery cell 1 and obtain detection information reflecting the internal status of the housing 10a through the optical fiber sensor assembly 300. This facilitates timely response when the internal status of the housing 10a is adversely affected, thereby improving the operating stability of the battery 10a.

[0162] According to some embodiments of the present application, optionally, as shown in Figures 1, 2 and 4, the electrical device also includes a processor 600, which is coupled to a demodulation device 702. The processor 600 is used to obtain detection information of the optical fiber 320, and based on the detection information of the optical fiber 320, correspondingly derive at least one of the pressure value, temperature value and gas concentration inside the shell 10a and the strain value of the battery cell 1.

[0163] Processor 600 may be an integrated circuit chip with signal processing capabilities. Processor 600 may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. A general-purpose processor may be a microprocessor or any conventional processor. For example, processor 600 is an MCU.

[0164] By coupling processor 600 to demodulation device 702, processor 600 can process detection information reflecting at least one of the pressure, temperature, and gas concentration within housing 10a, and the strain of battery cell 1, and calculate at least one of the pressure, temperature, and gas concentration within housing 10a, and the strain of battery cell 1, thereby improving the accuracy of the detection results. Furthermore, the responses of optical fiber 320 to the pressure, temperature, and gas concentration within housing 10a, and the strain of battery cell 1, can be superimposed. When the detection optical signal reflects at least two of the pressure, temperature, and gas concentration within housing 10a, and the strain of battery cell 1, processor 600 can utilize a decoupling algorithm to process the detection information.

[0165] According to some embodiments of the present application, as shown in Figures 4 and 12 , an auxiliary device 700 is coupled to the battery 100a. The auxiliary device 700 includes a light source 701 and a demodulator 702. The light source 701 is configured to input an incident optical signal to the interface 310. The demodulator 702 is configured to receive a detection optical signal transmitted from the interface 310 and demodulate the detection optical signal to obtain detection information from the optical fiber 320.

[0166] The demodulation device 702 can convert the detection optical signal carrying the detection information into an electrical signal carrying the detection information, thereby facilitating the identification and utilization of the detection information. Compared to the optical fiber sensing assembly 300, the auxiliary device 700 is more expensive. By coupling the auxiliary device 700 with the battery 100a, the auxiliary device 700 can detect multiple batteries 100a, thereby eliminating the need for the battery 100a to demodulate the detection optical signal. This helps reduce the manufacturing cost of the battery 100a and improves its energy density.

[0167] According to some embodiments of the present application, optionally, the auxiliary device 700 is a charging device, and the charging device is used to charge the battery 100a.

[0168] With this arrangement, the charging device can charge the battery cell 1 while acquiring detection information reflecting the internal state of the shell 10a through the optical fiber sensing assembly 300, which is conducive to taking timely countermeasures when the internal state of the shell 10a is poor, thereby reducing the risk of the charging process.

[0169] Alternatively, the auxiliary device 700 is a maintenance device, which is used to inspect the battery 100a.

[0170] With this arrangement, the maintenance equipment can obtain detection information reflecting the internal status of the shell 10a through the optical fiber sensing component 300, which is convenient for the maintenance equipment to be used to inspect the battery 100a, and is conducive to taking timely countermeasures when the internal status of the shell 10a is poor, thereby reducing the risk of the charging process.

[0171] According to some embodiments of the present application, optionally, as shown in Figures 2, 4 and 12, the auxiliary device 700 also includes a processor 600, which is coupled to the demodulation device 702. The processor 600 is used to obtain detection information of the optical fiber 320, and based on the detection information of the optical fiber 320, correspondingly derive at least one of the pressure value, temperature value and gas concentration inside the shell 10a and the strain value of the battery cell 1.

[0172] By coupling processor 600 to demodulation device 702, processor 600 can process detection information reflecting at least one of the pressure, temperature, and gas concentration within housing 10a, and the strain of battery cell 1, and calculate at least one of the pressure, temperature, and gas concentration within housing 10a, and the strain of battery cell 1, thereby improving the accuracy of the detection results. Furthermore, the responses of optical fiber 320 to the pressure, temperature, and gas concentration within housing 10a, and the strain of battery cell 1, can be superimposed. When the detection optical signal reflects at least two of the pressure, temperature, and gas concentration within housing 10a, and the strain of battery cell 1, processor 600 can utilize a decoupling algorithm to process the detection information.

[0173] Optionally, the processor 600 may control the demodulation device 702 to acquire the detection light signal and demodulate the detection light signal. The processor 600 may also control the light source 701 to emit the incident light signal.

[0174] To sum up, the embodiments of the present application can detect the state inside the shell 10a, thereby monitoring the impact of the battery cell 1 on the internal state of the shell 10a. When the battery cell 1 has an adverse effect on the internal state of the shell 10a, it can promptly issue an early warning and take countermeasures, thereby reducing the risks caused by adverse problems of the battery 100a.

[0175] 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: case; A battery cell, contained in the housing; An optical fiber sensing assembly, the optical fiber sensing assembly comprising an interface end and an optical fiber coupled to the interface end; The interface end is relatively fixed to the shell and exposed to the outside, and is used to receive an incident light signal emitted by an external light source and transmit the incident light signal to the optical fiber; the optical fiber is arranged inside the shell and outside the battery cell, and is used to detect at least one of the pressure, temperature and gas inside the shell and the strain of the battery cell to obtain a detection light signal; the interface end is also used to couple with an external demodulation device to send the detection light signal fed back by the optical fiber to the external demodulation device, so that the external demodulation device is used to demodulate the detection light signal to obtain the detection information of the optical fiber; The optical fiber comprises an optical fiber body and a grating arranged on the optical fiber body, wherein the grating is used to modulate an incident light signal input to the optical fiber body so that the optical fiber body generates the detection light signal; The grating is a reflection grating; the interface end has an interface, and the interface is coupled to one end of the optical fiber body; the optical fiber body is used to receive the incident light signal through the interface, and is also used to send the detection light signal to the external demodulation device through the interface; or, the grating is a transmission grating; the interface end has two interfaces, and the two interfaces are respectively coupled to the two ends of the optical fiber body; the optical fiber body receives the incident light signal through one of the two interfaces, and is also used to send the detection light signal to the external demodulation device through the other of the two interfaces; The optical fiber has a first detection optical fiber segment and a second detection optical fiber segment arranged at intervals along the extension direction of the optical fiber, the first detection optical fiber segment is used to detect the temperature inside the shell, and the second detection optical fiber segment is used to detect the strain of the battery cell, and the optical fiber also has a third detection optical fiber segment and a fourth detection optical fiber segment arranged at intervals along the extension direction of the optical fiber, the third detection optical fiber segment is used to detect the gas inside the shell, and the fourth detection optical fiber segment is used to detect the pressure inside the shell, so that the detection information of the optical fiber can be processed by using a decoupling algorithm; wherein the first detection optical fiber segment is located upstream of the second detection optical fiber segment in the transmission direction of the incident light signal; the second detection optical fiber segment is closely attached to and fixed to the surface of the battery cell, and the first detection optical fiber segment is spaced apart from the surface of the battery cell; The optical fiber includes at least two sub-optical fibers fused together front and back, each of the sub-optical fibers is used to detect the pressure, temperature and gas inside the shell and the strain of the battery cell; at least two of the sub-optical fibers have different diameters; the sub-optical fibers with different diameters have different sensitivities to the pressure, temperature, gas inside the shell and the strain of the battery cell, so that the responses of the optical fiber to the pressure, temperature and gas inside the shell and the strain of the battery cell can be distinguished, and then the pressure, temperature and gas inside the shell or the strain of the battery cell can be calculated using a decoupling algorithm.

2. The battery according to claim 1, characterized in that The optical fiber has a first detection optical fiber segment and a second detection optical fiber segment arranged at intervals along the extension direction of the optical fiber; wherein the first detection optical fiber segment is arranged outside the battery cell; and / or the second detection optical fiber segment is arranged inside the battery cell.

3. The battery according to claim 1, characterized in that The optical fiber includes an optical fiber body and a resonant cavity, one end of the optical fiber body is coupled to the interface end, and the resonant cavity is arranged at the other end of the optical fiber body; the resonant cavity has a resonant cavity connected to the interior of the shell and a reflective film arranged in the resonant cavity, and a sensitive material coating is arranged on the reflective film; the reflective film is used to reflect the incident light signal; the sensitive material coating is used to change the reflective film in response to a preset gas or pressure, so as to modulate the incident light signal.

4. The battery according to claim 3, characterized in that The sensitive material coating includes palladium, and the sensitive material coating is used to cause the reflective film to change in response to the concentration of hydrogen gas, so as to modulate the incident light signal.

5. The battery according to claim 1, characterized in that The optical fiber includes an optical fiber body and at least one sensitive material coating, wherein the at least one sensitive material coating is respectively coated on the outer circumference of the optical fiber body and is used to change the incident light signal in response to a preset gas so as to modulate the incident light signal.

6. The battery according to claim 1, characterized in that The number of the optical fibers is at least two, and at least two of the optical fibers are arranged side by side, wherein one of the optical fibers is used to detect the temperature inside the shell, and the other optical fiber is used to detect the strain of the battery cell.

7. The battery according to claim 6, characterized in that The optical fiber for detecting the strain of the battery cell is closely attached to and fixed on the surface of the battery cell, and the optical fiber for detecting the temperature inside the housing is spaced apart from the surface of the battery cell.

8. The battery according to claim 1, characterized in that The optical fiber includes two fiber cores respectively extending along the extension direction of the optical fiber, and the optical fiber is used to detect at least one of the temperature inside the shell and the strain of the battery cell based on one of the two fiber cores, and to detect at least the other of the temperature inside the shell and the strain of the battery cell based on the other of the two fiber cores.

9. An electrical device, characterized in that: Comprising the battery according to any one of claims 1 to 8.

10. The electrical device according to claim 9, characterized in that: The electrical device includes a charging interface portion, which is provided with a charging interface, and the charging interface is coupled to the battery cell; the charging interface portion includes a docking end, and the docking end and the interface end are coupled, and the charging interface portion is used to dock with the power supply interface portion of an external device, so that the external device is used to input the incident light signal to the interface end through the docking end, and receive the detection light signal output through the interface end through the docking end.

11. The electrical device according to claim 10, characterized in that: The electrical device also includes a processor, which is coupled to the demodulation device and is used to obtain detection information of the optical fiber and, based on the detection information of the optical fiber, correspondingly derive at least one of the pressure value, temperature value and gas concentration inside the shell and the strain value of the battery cell.

12. An auxiliary device, characterized in that: The auxiliary device is used to couple with the battery as described in any one of claims 1-11; the auxiliary device includes a light source and a demodulation device; the light source is used to input the incident light signal to the interface end; the demodulation device is used to receive the detection light signal sent by the interface end, and to demodulate the detection light signal to obtain the detection information of the optical fiber.

13. The auxiliary device according to claim 12, characterized in that The auxiliary device is a charging device, and the charging device is used to charge the battery; or the auxiliary device is a maintenance device, and the maintenance device is used to inspect the battery.

14. The auxiliary device according to claim 13, characterized in that The auxiliary device also includes a processor, which is coupled to the demodulation device and is used to obtain detection information of the optical fiber and, based on the detection information of the optical fiber, correspondingly derive at least one of the pressure value, temperature value and gas concentration inside the shell and the strain value of the battery cell.

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