Battery, electric device, and battery assembly method

Abstract

The present application discloses a battery, an electric device, and a battery assembly method. The battery comprises a housing, a battery cell group, and an optical fiber temperature measurement assembly. The battery cell group is arranged inside the housing, and comprises a top, a peripheral side and a bottom; the top and the bottom are arranged opposite to each other, and the peripheral side is connected between the top and the bottom; the optical fiber temperature measurement assembly is arranged inside the housing, and comprises at least one optical fiber; the at least one optical fiber is provided with a plurality of temperature measurement sampling points, and the plurality of temperature measurement sampling points include at least one first temperature measurement sampling point and at least one second temperature measurement sampling point; at least one temperature measurement sampling point is arranged on at least one of the top and the bottom, and at least one second temperature measurement sampling point is arranged on the peripheral side to form a three-dimensional temperature measurement dot-matrix; and the optical fiber temperature measurement assembly is used for carrying out temperature sampling on different positions of the battery cell group. By means of the mode, the temperatures of different positions on the battery cell group can be acquired, thereby improving the accuracy and reliability of battery temperature measurement.

Description

Battery, electric device, and battery assembly method

Technical field

[0001] The present application relates to the field of battery technology, and in particular to a battery, an electrical device, and a battery assembly method. [Background Technology]

[0002] With the advancement of battery technology, batteries containing cell packs are finding applications in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Cell packs store chemical energy and controllably convert it into electrical energy. In recyclable cell packs, after discharge, the active materials can be activated by recharging for continued use.

[0003] However, during the actual battery charge and discharge process, chemical energy isn't fully converted into electrical energy; rather, some of it is converted into heat. Consequently, the temperature of the battery pack fluctuates during use. To prevent accidents caused by abnormal battery temperature fluctuations, temperature-measuring chips are currently installed in batteries to monitor the battery's temperature. However, due to the high cost of temperature-measuring chips, the number of these chips installed in a battery is typically small, making it difficult to effectively and comprehensively monitor the temperature of the entire battery.

[0004] [Summary of the invention]

[0005] In view of the above problems, the present application provides a battery, an electrical device and a battery assembly method, which can obtain the temperature of different positions on the battery cell group, thereby forming a three-dimensional temperature measurement point array to improve the accuracy and reliability of battery temperature measurement.

[0006] In a first aspect, the present application provides a battery comprising a housing, a battery cell group, and an optical fiber temperature measurement assembly. The battery cell group is disposed within the housing and comprises a top, a peripheral side, and a bottom, the top and bottom being disposed opposite each other, and the peripheral side being connected between the top and bottom. The optical fiber temperature measurement assembly is disposed within the housing and comprises at least one optical fiber, the at least one optical fiber having multiple temperature measurement sampling points, the multiple temperature measurement sampling points comprising at least one first temperature measurement sampling point and at least one second temperature measurement sampling point, the at least one temperature measurement sampling point being disposed at at least one of the top and bottom, and the at least one second temperature measurement sampling point being disposed at the peripheral side to form a three-dimensional temperature measurement point array, the optical fiber temperature measurement assembly being used to sample temperatures at different locations of the battery cell group.

[0007] Through the above method, by using at least one optical fiber to set up multiple temperature measurement sampling points on the periphery of the battery cell group, a three-dimensional temperature measurement point array is formed that can sample the temperature at different positions on the periphery of the battery cell group. The temperature of different surfaces on the periphery of the battery cell group can be detected, which is conducive to improving the accuracy of battery temperature measurement and making the temperature detection results more comprehensive and reliable. At the same time, temperature anomalies can be detected from different positions, which is convenient for determining the location of the temperature anomaly and facilitating subsequent early warning operations. Furthermore, the properties of the optical fiber-based temperature measurement component are more stable than those of the temperature measurement chip, reducing the probability of false alarms, missed alarms, and failures of the temperature measurement component.

[0008] In some embodiments, the battery cell group includes at least two battery cells, and the at least two battery cells are arranged side by side; the battery cell is provided with two poles with opposite polarities; both poles are located at the top, and at least one first temperature measurement sampling point is provided at the top; or, one of the two poles is provided at the top, and the other is provided at the bottom, and the top and bottom are respectively provided with first temperature measurement sampling points.

[0009] By using the above method, the temperature of the surface of the battery cell where the pole that is prone to heat is located can be detected, thereby detecting the temperature more quickly and effectively.

[0010] In some embodiments, the poles of any two adjacent battery cells are electrically connected through a bar, and at least one first temperature measurement sampling point is set on the bar.

[0011] Through the above method, the first temperature measurement sampling point can be set on the bar, thereby indirectly detecting the temperature of the pole close to the bar, thereby improving the accuracy and efficiency of detecting the temperature of the heat-prone area.

[0012] In some embodiments, each bar is provided with at least one first temperature measurement sampling point.

[0013] Through the above method, the temperature of each chip can be detected, avoiding missing chips with abnormal heating conditions, and improving the accuracy and comprehensiveness of detecting the temperature of areas prone to heating.

[0014] In some embodiments, a plurality of first temperature measurement sampling points are provided on at least one bar, and the plurality of first temperature measurement sampling points on the same bar are spaced apart along the extension direction of the corresponding bar.

[0015] Through the above method, the accuracy and comprehensiveness of detecting the temperature of the heat-prone area are improved.

[0016] In some embodiments, the distance between any two adjacent first temperature measurement sampling points on the same sheet is greater than or equal to 60 mm to 400 mm.

[0017] By using the above method, the temperature difference between different first temperature measurement sampling points can be reasonably controlled, thereby avoiding the convergence or incompleteness of measured data caused by the close distance between two first temperature measurement points.

[0018] In some embodiments, at least one first temperature measurement sampling point is set on a side of the corresponding bar away from the pole and is located in an area corresponding to the position of the pole.

[0019] Since the temperature of the pole is very easy to increase during the charging and discharging process, through the above method, the first temperature measurement sampling point can be closer to the pole, thereby enabling more effective and accurate temperature detection of the pole covered by the sheet in a shorter time.

[0020] In some embodiments, a first temperature measurement sampling point is set in an area corresponding to the position of each pole.

[0021] The above method can be used to conduct a more comprehensive inspection of the battery poles, thereby avoiding missing inspection of abnormally hot poles.

[0022] In some embodiments, the number of the at least one second temperature measurement sampling point is multiple, and the multiple second temperature measurement sampling points are arranged at intervals on the circumference.

[0023] The above method can effectively detect the temperatures at different locations around the battery cell group.

[0024] In some embodiments, the peripheral side includes two first side surfaces and two second side surfaces, the two first side surfaces are arranged opposite to each other, and the two second side surfaces are arranged opposite to each other and are respectively connected to the two first side surfaces; the area of ​​the first side surface is larger than the area of ​​the second side surface; at least part of the second temperature measurement sampling points are arranged in an array manner on at least one of the two first side surfaces.

[0025] By using the above method, the second temperature measurement sampling points are arranged in an array on the first side surface which is larger around the battery cell group, so as to more comprehensively detect the temperature of each point on the first side surface.

[0026] In some embodiments, the first side has a length direction and a width direction, and the second temperature measurement sampling points located on the same first side are divided into multiple groups. Each group of second temperature measurement sampling points is arranged at intervals along the length direction on the corresponding first side, and multiple groups of second temperature measurement sampling points are arranged at intervals along the width direction to form an array arrangement; wherein, the spacing between two adjacent second temperature measurement sampling points in each group of second temperature measurement sampling points is greater than 60 mm.

[0027] By using the above method, the second temperature measurement sampling points are arranged in an array on the first side surface which is larger around the battery cell group, so as to more comprehensively detect the temperature of each point on the first side surface.

[0028] In some embodiments, at least another portion of the second temperature measurement sampling points are arranged in an array on at least one of the two second side surfaces.

[0029] By using the above method, the second temperature measurement sampling points are arranged in an array on the smaller second side surface around the battery cell group, so as to more comprehensively detect the temperature of each point on the second side surface.

[0030] In some embodiments, each temperature measurement sampling point is set as a segment on the corresponding optical fiber; the segment length of each temperature measurement sampling point is 5 to 15 mm.

[0031] Through the above method, the cost of setting the temperature measurement sampling point and the accuracy of the temperature detection at the temperature measurement sampling point can be controlled by controlling the section length, thereby improving the sensitivity of the temperature measurement sampling point and reducing the cost of the optical fiber temperature measurement component.

[0032] In some embodiments, the optical fiber temperature measurement component also includes an optical fiber connector, which is coupled to at least one optical fiber; the optical fiber connector is passed through the shell; the optical fiber connector is used to couple an external device to input the detection light input by the external device to at least one optical fiber and output feedback light to the external device.

[0033] Through the above method, detection light can be input into the optical fiber, and then the temperature can be detected using the optical fiber temperature measurement component, and the data measured at the temperature measurement sampling point can be output outside the battery.

[0034] In some embodiments, at least one optical fiber is wound around the periphery of the battery cell group, and each optical fiber is coated with a bending buffer layer.

[0035] By using the above method, a bending buffer layer is coated on the outside of the optical fiber to protect the optical fiber, reduce the probability of optical fiber breakage caused by bending stress on the optical fiber, and avoid the stress breakage affecting the temperature detection effect.

[0036] In some embodiments, the bending buffer layer includes a polyimide film; and / or the at least one optical fiber is fixed to the periphery of the battery cell group or the housing by a fixing glue.

[0037] Through the above method, a lower-cost fixing glue can be used to achieve a better optical fiber fixing effect, thereby improving the strength of the optical fiber and the stability of the temperature measurement sampling point.

[0038] In some embodiments, at least one optical fiber includes a first optical fiber and multiple second optical fibers, the multiple second optical fibers are arranged on the periphery of the battery cell group, the multiple second optical fibers are connected to the first optical fiber at intervals along the extension direction of the first optical fiber, and are respectively optically coupled with the first optical fiber; the first optical fiber is used to input the incident light of the light source into the multiple second optical fibers respectively, and to converge and output the output light of the multiple second optical fibers.

[0039] Through the above method, the first optical fiber is used to transmit the incident light of the light source into multiple second optical fibers, and the outgoing light of the multiple second optical fibers is output. The multiple second optical fibers are used to detect the temperature of the periphery of the battery cell group, thereby expanding the range of temperature detection and improving the comprehensiveness of temperature detection, which is conducive to more accurate monitoring of the temperature of multiple positions of the battery.

[0040] In a second aspect, the present application provides an electrical device comprising a battery as described in any one of the above items.

[0041] In some embodiments, the electrical device includes a light source and a demodulation module. The light source is coupled to at least one optical fiber and is used to input detection light into the at least one optical fiber. The demodulation module is coupled to at least one optical fiber and is used to receive feedback light output by the at least one optical fiber and demodulate the feedback light to obtain a temperature measurement signal corresponding to each temperature measurement sampling point.

[0042] By using the above method, the temperature measurement signal of each sampling point can be effectively obtained, thereby facilitating the acquisition of the temperature of each sampling point.

[0043] In some embodiments, the electrical device further includes a processor coupled to the demodulation module, configured to receive a temperature measurement signal and obtain the temperature collected at each temperature measurement sampling point according to the temperature measurement signal.

[0044] Through the above method, the temperature of each temperature measurement sampling point can be obtained using the temperature measurement signal.

[0045] In some embodiments, the processor is configured to generate a temperature distribution heat map of the battery according to the position of each temperature measurement sampling point on the battery and the corresponding temperature.

[0046] Through the above method, the temperature distribution of the battery can be presented intuitively.

[0047] In some embodiments, the processor is configured to determine whether an abnormality occurs in the battery based on the temperatures collected at multiple temperature measurement sampling points, and to execute corresponding early warning measures if an abnormality occurs.

[0048] Through the above method, the battery condition can be judged according to the temperature, and an early warning can be issued when an abnormality occurs, thereby improving the stability of the battery.

[0049] On the third aspect, the present application provides a battery assembly method, comprising: providing a battery cell group and a shell; assembling an optical fiber temperature measurement component on the periphery of the battery cell group, the optical fiber temperature measurement component comprising at least one optical fiber, the at least one optical fiber having a plurality of temperature measurement sampling points, so that the plurality of temperature measurement sampling points are arranged at intervals on the periphery of the battery cell group to form a three-dimensional temperature measurement point array, which is then used to perform temperature sampling at different positions of the battery cell group; after the optical fiber temperature measurement component is assembled on the battery cell group, the battery cell group is assembled in the shell.

[0050] In some embodiments, at least one optical fiber is bonded to the periphery of the battery cell group by thermally conductive adhesive.

[0051] Through the above method, the thermal conductive adhesive is used to achieve a better optical fiber fixing effect, so that the optical fiber and the battery cell group are relatively fixed, thereby improving the strength of the optical fiber temperature measurement component and the stability of the temperature measurement sampling point.

[0052] 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

[0053] 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:

[0054] FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0055] FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0056] FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0057] FIG4 is a schematic structural diagram of two battery cells and an optical fiber temperature measurement assembly according to one or more embodiments;

[0058] FIG5 is a schematic structural diagram of a battery cell group and an optical fiber temperature measurement assembly according to one or more embodiments;

[0059] FIG6 is a schematic structural diagram of an electric device according to one or more embodiments;

[0060] FIG. 7 is a schematic flow chart of a method for assembling a battery according to one or more embodiments.

[0061] The accompanying drawings in the specific implementation manner are as follows:

[0062] 1000a vehicles;

[0063] 100a battery; 200a controller; 300a motor;

[0064] 10a housing; 11a first portion; 12a second portion; 13a accommodation space;

[0065] 1 battery cell; 1b power-consuming device;

[0066] 21 end plate; 22 housing; 221 open end; 23 electrode assembly; 23a pole ear; 26 pole column; 4 battery cell group; 41 top; 42 side; 421 first side; 422 second side; 43 bottom; 5 light source; 6 fiber optic modem; 61 demodulation module; 62 modulation module; 7 processor; 8 fiber optic temperature measurement assembly; 81 temperature measurement sampling point; 811 first temperature measurement sampling point; 812 second temperature measurement sampling point; 82 fiber optic connector; 83 optical fiber; 83a first optical fiber; 83b second optical fiber; 9 fiber optic chip. [Specific implementation method]

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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).

[0073] 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.

[0074] 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.

[0075] With the advancement of battery technology, batteries containing cell packs are finding applications in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Cell packs store chemical energy and controllably convert it into electrical energy. In recyclable cell packs, after discharge, the active materials can be activated by recharging for continued use.

[0076] However, during the actual charge and discharge process of a battery, chemical energy cannot be fully converted into electrical energy. A portion of this energy is converted into heat, causing the temperature of the battery pack to fluctuate during use. Uncontrolled and abnormal changes in battery temperature are also known as thermal runaway. When thermal runaway occurs, the battery may experience dangerous accidents such as spontaneous explosion and combustion. To effectively monitor battery temperature and prevent such accidents, a temperature measurement chip is currently installed in the battery to detect the temperature of the battery pack.

[0077] However, the inventors noted that due to the high cost of temperature measurement chips, the number of these chips installed on a battery pack is generally small, making it difficult to effectively monitor multiple battery locations. Furthermore, the stability of the temperature measurement chips is also limited, resulting in false alarms after a period of use.

[0078] To improve the effectiveness of temperature monitoring at various locations within the battery, a fiber optic temperature measurement assembly can be installed inside the housing to perform temperature measurement. This assembly includes at least one optical fiber, on which multiple temperature measurement sampling points can be set. These sampling points are spaced around the periphery of the battery pack to form a three-dimensional temperature measurement array, enabling temperature sampling at different locations within the battery pack.

[0079] Based on the above considerations, the present application provides a battery and an electrical device. By installing an optical fiber temperature measurement assembly within the battery housing, multiple temperature measurement sampling points on the optical fiber form a three-dimensional temperature measurement array around the periphery of the battery cell group, allowing temperature sampling at different locations within the battery cell group. This provides more diverse temperature information for temperature detection within the battery, improving the accuracy and reliability of temperature measurement.

[0080] The battery and the electrical device disclosed in the embodiments of the present application can be used in electrical devices that use the battery as a power source or various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy 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 the spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0081] 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.

[0082] Please refer to Figure 1, which is a schematic structural diagram of a vehicle according to one or more embodiments. 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 the vehicle 1000a. The battery 100a can be provided at the bottom, head or tail of the vehicle 1000a. The battery 100a can be used to power the vehicle 1000a. For example, the battery 100a can serve as an operating power source for the vehicle 1000a. The vehicle 1000a may also include a controller 200a and a motor 300a. The controller 200a is used to control the battery 100a to power the motor 300a, for example, for starting, navigating and driving the vehicle 1000a.

[0083] 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.

[0084] In some embodiments, the battery 100a may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0085] 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.

[0086] In the embodiment of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after discharge and continue to be used. Each battery cell 1 may also be a primary battery.

[0087] 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.

[0088] In some embodiments, the battery 100 a may include a battery cell group. When there are multiple battery cells 1 , the multiple battery cells 1 are arranged and fixed to form a battery cell group.

[0089] In some embodiments, referring to FIG. 2 , the battery 100 a may be a battery pack, which includes a housing 10 a and a battery cell 1 . The battery cell 1 or the battery cell group 4 is accommodated in an accommodation space 13 a formed inside the housing 10 a .

[0090] 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.

[0091] Please refer to Figure 2, which is a schematic diagram of the exploded structure of a battery according to one or more embodiments. Battery 100a includes a housing 10a and a battery cell 1, with the battery cell 1 being housed within the housing 10a. The housing 10a is configured to provide a storage space 13a for the battery cell 1, and the housing 10a can have a variety of structures. In some embodiments, the housing 10a can include a first portion 11a and a second portion 12a, which overlap with each other and together define a storage space 13a for accommodating the battery cell 1. The second portion 12a can be a hollow structure with one end open, and the first portion 11a can be a plate-like structure, with the first portion 11a overlapping the open side of the second portion 12a, so that the first portion 11a and the second portion 12a together define the storage space 13a. Alternatively, the first portion 11a and the second portion 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 portion 11a and the second portion 12a can be in various shapes, such as a cylinder, a cuboid, etc.

[0092] In the battery 100a, there may be multiple battery cells 1, and the multiple battery cells 1 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 1. The multiple battery cells 1 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell group 4 may be contained within the housing 10a. Of course, the battery 100a may also be a battery cell group 4 formed by first connecting multiple battery cells 1 in series, in parallel, or in a hybrid connection, and then the multiple battery cell groups 4 may be connected in series, in parallel, or in a hybrid connection to form an entire battery cell group 4 contained within the housing 10a. The battery 100a may also include other structures, for example, the battery 100a may also include tabs, which are used to achieve electrical connection between the multiple battery cells 1.

[0093] Each battery cell 1 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 1 can be cylindrical, flat, rectangular, or in other shapes.

[0094] Please refer to Figure 3, which is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments. Figure 3 is a schematic diagram of the exploded structure of a battery cell 1 provided in some embodiments of the present application. A battery cell 1 is the smallest unit that makes up a battery. As shown in Figure 3, a battery cell 1 includes an end plate 21, a housing 22, an electrode assembly 23, and other functional components.

[0095] The end plate 21 refers to a component that covers the open end of the outer shell 22 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end plate 21 can be adapted to the shape of the outer shell 22 to match the outer shell 22. Optionally, the end plate 21 can be made of a material with a certain hardness and strength (such as an aluminum alloy). In this way, the end plate 21 is less likely to deform when squeezed or collided, allowing the battery cell 1 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 21a can be provided on the end plate 21. The electrode terminal 21a can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy into or out of the battery cell 1. In some embodiments, the end plate 21 can also be provided with an explosion-proof valve for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The material of the end plate 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application are not particularly limited in this regard. In some embodiments, an insulating member may be provided inside the end plate 21 to isolate the electrical connection components in the housing 22 from the end plate 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0096] The outer shell 22 is a component used to cooperate with the end plate 21 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The outer shell 22 and the end plate 21 can be independent components, and an opening can be provided on the outer shell 22, and the internal environment of the battery cell 1 is formed by covering the opening with the end plate 21. Without limitation, the end plate 21 and the outer shell 22 can also be integrated. Specifically, the end plate 21 and the outer shell 22 can form a common connection surface before other components are inserted into the shell. When the interior of the outer shell 22 needs to be encapsulated, the end plate 21 is covered with the outer shell 22. The outer shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc.

[0097] Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the application does not impose any special restrictions on this.

[0098] The electrode assembly 23 is a component in the battery cell 1 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive and negative electrode active materials react with the electrolyte, and the tabs 23a connect the electrode terminals to form a current loop.

[0099] According to some embodiments of the present application, referring to Figures 2 to 5, Figure 4 is a schematic diagram of the structure of two battery cells and an optical fiber temperature measurement assembly according to one or more embodiments. Figure 5 is a schematic diagram of the structure of a battery cell group and an optical fiber temperature measurement assembly according to one or more embodiments. The present application provides a battery 100a, which includes a shell 10a, a battery cell group 4, and an optical fiber temperature measurement assembly 8. The battery cell 1 is arranged inside the shell 10a; the optical fiber temperature measurement assembly 8 is arranged inside the shell 10a and includes at least one optical fiber 83, and the at least one optical fiber 83 has a plurality of temperature measurement sampling points 81. The plurality of temperature measurement sampling points 81 are arranged at intervals on the periphery of the battery cell group 4 to form a three-dimensional temperature measurement point array. The optical fiber temperature measurement assembly 8 is used to perform temperature sampling on different positions of the battery cell group 4.

[0100] Optionally, the number of optical fibers 83 can be one, and one optical fiber 83 can be wound around the periphery of the battery cell group 4, and can be fixed specifically by thermally conductive adhesive. The specific winding method can be determined based on the actual temperature measurement requirements. The following also provides an example of the location of the temperature measurement sampling point 81 in this embodiment. Optionally, the number of optical fibers 83 can also be multiple, and multiple optical fibers 83 can be combined into one, that is, multiple optical fibers 83 (which can be considered as branches) can be laid out around the periphery of the battery cell group 4, and finally converged onto another independent optical fiber 83 (which can be considered as a main road). The specific convergence of optical fibers can be achieved, for example, using an optical fiber coupler. The combined optical fiber 83 can eventually have an interface for optical coupling with the outside world, for receiving a light source or outputting light.

[0101] The optical fiber temperature measurement assembly 8 utilizes ambient temperature to modulate the Bragg wavelength of the optical fiber 83 to acquire temperature sensing information, thereby detecting the ambient temperature based on changes in the optical signal in the optical fiber 83. The temperature measurement sampling points 81 may be grating structures spaced along the extension direction of the optical fiber 83. This allows the optical signal input into the optical fiber 83 to sequentially pass through each temperature measurement sampling point 81 along the optical fiber 83, thereby detecting the temperature at different locations of the battery cell group 4 at each temperature measurement sampling point 81.

[0102] The multiple temperature measurement sampling points 81 disposed around the periphery of the battery cell group 4 are not arranged in the same plane, thereby forming a three-dimensional temperature measurement array. Compared to temperature sensors on a plane, this three-dimensional array of temperature measurement sampling points 81 offers a greater diversity of temperature measurement locations. Furthermore, their arrangement in three dimensions also enhances the diversity of the detection ranges of each temperature measurement sampling point 81. Furthermore, because the cost of deploying the temperature measurement sampling points 81 is lower than that of conventional temperature sensors, the three-dimensional array and its large number of temperature measurement sampling points 81 can detect temperatures over a wider range, thereby improving the accuracy and reliability of temperature measurements.

[0103] The determination that the temperature measurement sampling points 81 are not located on the same plane can be based on connecting the center points of these temperature measurement sampling points 81 to form multiple line segments to determine whether these temperature measurement sampling points 81 are located on the same plane. The outer periphery of the battery cell group 4 can refer to the space between the outer surface of the battery cell group 4 and the inner wall of the housing 10a. The optical fiber 83 can be arranged in this space, for example, wrapped around the outer surface of the battery cell group 4, so that the temperature measurement sampling points 81 can detect the temperature of a specific area within this space.

[0104] Optionally, the detection object of the temperature measurement sampling point 81 can be the temperature of the gas near the temperature measurement sampling point 81 and / or the temperature of the battery cell group 4 close to the temperature measurement sampling point 81, and its temperature measurement range is a three-dimensional space area centered on the center point of the temperature measurement sampling point 81.

[0105] Optionally, multiple temperature measurement sampling points 81 are set on the optical fiber 83, so the space occupied by setting the first temperature measurement sampling point 811 is smaller than that of the previous temperature measurement chip, and the cost is also lower. At the same time, since the optical fiber 83 has a certain flexibility, its layout position is also more flexible, which is conducive to targeted layout in the battery 100a.

[0106] Optionally, the length of the section occupied by the temperature measurement sampling point 81 on the optical fiber 83 may be 5 mm to 15 mm. Specifically, this value may be 10 mm.

[0107] By using at least one optical fiber 83 to set up multiple temperature measurement sampling points 81 around the periphery of the battery cell group 4, a three-dimensional temperature measurement array is formed that can sample the temperature at different locations of the battery cell group 4. This allows for more comprehensive monitoring of the temperature within the battery 100a, which helps improve the accuracy of temperature measurement of the battery 100a. Furthermore, the optical fiber temperature measurement assembly 8 is more stable than a temperature measurement chip, and the cost of setting up a temperature measurement sampling point 81 is lower than that of setting up a temperature measurement chip. This not only reduces the cost of monitoring the temperature of the battery 100a, but also reduces the probability of false alarms, missed alarms, and failure of the temperature measurement assembly, thereby improving the reliability of temperature measurement.

[0108] According to some embodiments of the present application, referring to FIG. 2 , a battery cell group 4 includes a top 41, a peripheral side 42, and a bottom 43. The top 41 and the bottom 43 are disposed opposite each other, and the peripheral side 42 is connected between the top 41 and the bottom 43. A plurality of temperature measurement sampling points 81 include at least one first temperature measurement sampling point 811 and at least one second temperature measurement sampling point 812. The at least one temperature measurement sampling point 81 is disposed at at least one of the top 41 and the bottom 43, and the at least one second temperature measurement sampling point 812 is disposed at the peripheral side 42.

[0109] Three different names, top 41, side 42, and bottom 43, can be used to distinguish different locations on the periphery of the battery cell pack 4. The top 41 and bottom 43 can be named based on the actual installation orientation of the battery cell pack 4 within the housing 10a. Top 41 and bottom 43 are two vertically opposite ends, with the top 41 at the top and the bottom 43 at the bottom. Side 42 is a general term for the other surfaces connecting the top 41 and bottom 43. The first temperature measurement sampling point 811 can detect the temperature of at least one of the top 41 and bottom 43, and the second temperature measurement sampling point 812 can detect the temperature of the side 42, thereby forming a three-dimensional temperature measurement point array that detects the temperature near the periphery of the battery cell pack 4.

[0110] For example, at least one optical fiber 83 may be provided on the top 41, and each of the at least one optical fiber 83 has a first temperature measurement sampling point 811. At least one optical fiber 83 may also be provided on the peripheral side 42, and each of the at least one optical fiber 83 has a second temperature measurement sampling point 812. Of course, at least one optical fiber 83 may also be provided on the bottom 43. The optical fibers 83 respectively provided on the top 41, the peripheral side 42, and the bottom 43 may be combined into an additional optical fiber 83 (through an optical fiber coupler, that is, the optical fiber temperature measurement component 8 may include an optical fiber coupler), thereby realizing the light source input and dispersing it onto each optical fiber 83, or the light output from each optical fiber 83 may be converged onto the additional optical fiber 83.

[0111] For example, the additional optical fiber 83 may be referred to as a first optical fiber, and the optical fibers 83 disposed at the top 41 , the circumferential side 42 , and / or the bottom 43 may be referred to as second optical fibers.

[0112] In some embodiments, referring to FIG6 , at least one optical fiber 83 includes a first optical fiber 83a and multiple second optical fibers 83b. The multiple second optical fibers 83b are disposed around the periphery of the battery cell group 4. The multiple second optical fibers 83b are spaced apart and connected to the first optical fiber 83a along the extension direction of the first optical fiber 83a, and are optically coupled to the first optical fiber 83a. The first optical fiber 83a is used to input the incident light from the light source 5 into the multiple second optical fibers 83b, and to converge and output the light emitted by the multiple second optical fibers 83b.

[0113] The incident light from the light source 5 can be transmitted to the multiple second optical fibers 83b through the first optical fiber 83a, and the outgoing light from the multiple second optical fibers 83b can be output. The multiple second optical fibers 83b can be used to detect the temperature of the periphery of the battery cell group 4, thereby expanding the range of temperature detection and improving the comprehensiveness of temperature detection, which is conducive to more accurate monitoring of the temperature of multiple locations in the battery 100a.

[0114] By setting a first temperature measurement sampling point 811 at the top 41 and / or bottom 43 and a second temperature measurement sampling point 812 at the peripheral side 42, the temperature of different sides of the periphery of the battery cell group 4 can be detected. Due to the presence of multiple temperature measurement sampling points 81, the data obtained by temperature detection is more comprehensive, thereby reducing false detection and missed detection caused by too few temperature sensors and single temperature data.

[0115] In some embodiments, referring to FIG4 , a battery cell group 4 includes at least two battery cells 1, arranged side by side. Each battery cell 1 is provided with two terminals 26 of opposite polarity. Both terminals 26 are located at the top 41, and at least one first temperature measurement sampling point 811 is provided at the top 41. Alternatively, one of the two terminals 26 is located at the top 41, and the other is located at the bottom 43, with first temperature measurement sampling points 811 provided at each of the top 41 and the bottom 43.

[0116] The battery cell 1 is the smallest unit for energy storage and output. Chemical reactions can occur in the battery cell 1, thereby achieving the purpose of completing the mutual conversion between electrical energy and chemical energy in the battery cell 1, and then outputting and storing energy. Multiple battery cells 1 are connected in series, parallel or mixed to form a battery cell group 4, which can increase the capacity of the battery 100a. The pole 26 can be set on the outer shell 22 and / or end plate 21 of the battery cell 1, and exposed to the inside of the shell 10a through the top 41 and / or bottom 43 of the battery cell group 4. One end of the pole 26 is connected to the electrode assembly 23 and / or electrolyte in the battery cell 1, and the other end is connected to the conductor outside the battery cell 1, thereby connecting the internal circuit of the battery cell 1 with the external circuit, thereby forming a loop for transmitting current. Since the pole 26 of the battery cell 1 needs to connect the internal circuit of the battery cell 1 with the external circuit, the pole 26 is prone to heat when current passes through.

[0117] By setting a first temperature measurement sampling point 811 at the top 41 and / or bottom 43 where the pole 26 is provided, the temperature of the top 41 and / or bottom 43 where the pole 26 that is prone to heat up on the battery cell 1 is located can be detected, and the temperature near the pole 26 can be detected more quickly and effectively, thereby improving the sensitivity and accuracy of temperature detection.

[0118] In some embodiments, referring to FIG. 4 , the poles 26 of any two adjacent battery cells 1 are electrically connected via the tabs 9 , and at least one first temperature measurement sampling point 811 is disposed on the tabs 9 .

[0119] When there are two or more battery cells 1, a tab 9 can be used to connect the poles 26 of two battery cells 1. The tab 9 is a conductor with a certain degree of thermal conductivity and may generate heat when current passes through it. Depending on the polarity, the poles 26 include positive poles and negative poles. When the tab 9 is used to connect the positive poles of different battery cells 1 to the positive poles and the negative poles to the negative poles, at least two battery cells 1 are connected in parallel. When the positive pole of one battery cell 1 is connected to the negative pole of another battery cell 1, at least two battery cells 1 are connected in series.

[0120] In order to improve the tightness of the connection and avoid short circuits or open circuits at the connection between the pole 26 and the tab 9, the tab 9 can be fixed to the pole 26 by welding. Therefore, when the pole 26 is connected to the tab 9, part of the surface area of ​​the pole 26 is covered by the tab 9, which makes it inconvenient to directly set the first temperature measurement sampling point 811 on the pole 26. Therefore, the first temperature measurement sampling point 811 can be set on the tab 9, so that while detecting the temperature of the tab 9, it can also indirectly detect the temperature near the pole 26, which is prone to heat.

[0121] By setting a first temperature measurement sampling point 811 on the tab 9 electrically connected to the pole 26, the heat transfer ability of the tab 9 is utilized to indirectly detect the temperature of the pole 26 connected to the tab 9. The temperature of the pole 26 connected to the tab 9 can be detected, thereby improving the accuracy of detecting the temperature of the heat-prone area in the battery 100a.

[0122] In some embodiments, each bar 9 is provided with at least one first temperature measurement sampling point 811. Each bar 9 is connected to at least two poles 26. By providing at least one first temperature measurement sampling point 811 on each bar 9, the temperature of each bar 9 can be detected, thereby avoiding missing detection of poles 26 and bars 9 with abnormal heating conditions, thereby improving the accuracy and comprehensiveness of detecting the temperature of areas prone to heating.

[0123] In some embodiments, a plurality of first temperature measurement sampling points 811 are provided on at least one bar 9 , and the plurality of first temperature measurement sampling points 811 on the same bar 9 are spaced apart along the extension direction of the corresponding bar 9 .

[0124] Existing temperature measurement chips occupy a large space when installed, and the space on the bar 9 is limited, making it inconvenient to install multiple temperature measurement chips, and the cost of installing multiple temperature measurement chips is also high. Since the optical fiber temperature measurement assembly 8 only needs to install optical fiber 83 on the bar 9, it occupies less space and is also low in cost. Therefore, there is no problem in setting multiple first temperature measurement sampling points 811 at intervals along the extension direction of the bar 9.

[0125] The extension direction of the bar 9 is the direction of the line connecting at least two poles 26 connected to the bar 9. When multiple first temperature measurement sampling points 811 are set at intervals along the extension direction of the bar 9, the first temperature measurement sampling points 811 can detect the temperature of multiple areas on the bar 9, thereby expanding the range of temperature detection and improving the accuracy and comprehensiveness of detecting the temperature of areas prone to heat.

[0126] In some embodiments, the distance between any two adjacent first temperature measurement sampling points 811 on the same bar 9 is greater than or equal to 60 mm to 400 mm.

[0127] Specifically, when the distance between the two temperature measurement sampling points 81 is too small, the detection ranges of the two temperature measurement sampling points 81 may overlap to a certain extent, resulting in the convergence of the detection results of the two, which will cause the temperature measurement sampling points 81 to be wasted. When the distance between the two temperature measurement sampling points 81 is too large, the interval between the detection ranges of the two temperature measurement sampling points 81 is too large, resulting in the temperature between the two temperature measurement sampling points 81 not being well detected, increasing the probability of missed detection and false detection, which is not conducive to the accuracy and comprehensiveness of temperature detection. The distance between two adjacent first temperature measurement sampling points 811 is the distance between the center points of the two adjacent first temperature measurement sampling points 811. This distance can be set according to the distance between the poles 26 of the two battery cells 1 connected by the bar 9 and the detection range of the first temperature measurement sampling point 811, so that the distance between the two adjacent first temperature measurement sampling points 811 can be controlled within a reasonable range.

[0128] Optionally, the distance between two adjacent first temperature measurement sampling points 811 can be 63.3 mm.

[0129] Optionally, the distance between two adjacent first temperature measurement sampling points 811 can be 72.3 mm.

[0130] Optionally, the distance between the first temperature measurement sampling point 811 close to the front end and / or the rear end of the bar sheet 9 and the front end and / or the rear end of the bar sheet 9 is 0 mm to 20 mm.

[0131] By controlling the distance between two adjacent first temperature measurement sampling points 811, the overlap of the detection areas of adjacent first temperature measurement sampling points 811 can be reduced, and the difference in the temperature measurement objects of different first temperature measurement sampling points 811 can be controlled to reduce the convergence of the measured data of adjacent first temperature measurement sampling points 811, thereby avoiding the waste of the first temperature measurement sampling points 811.

[0132] In some embodiments, referring to FIG. 4 , at least one first temperature measurement sampling point 811 is disposed on a side of the corresponding bar 9 away from the pole 26 and located in an area corresponding to the position of the pole 26 .

[0133] Optionally, when the specifications of the battery cells 1 are uniform and a first temperature measurement sampling point 811 needs to be set for each pole 26, the spacing between two adjacent first temperature measurement sampling points 811 can be the size of the battery cell 1 in the extension direction of the bar 9, so that the first temperature measurement sampling point 811 can detect the temperature of the pole 26.

[0134] The side of the bar 9 close to the pole 26 needs to be connected to the pole 26, so it is not convenient to set the first temperature measurement sampling point 811 directly on this side or on the pole 26, and the surface of the bar 9 facing away from the pole 26 is exposed in the shell 10a. By setting the first temperature measurement sampling point 811 in the area corresponding to the pole 26 on this surface, more effective and accurate temperature detection can be performed on the pole 26 covered by the bar 9.

[0135] In some embodiments, the tab 9 is provided with a first temperature measurement sampling point 811 in an area corresponding to the position of each pole 26. By providing a first temperature measurement sampling point 811 for each pole 26 on the tab 9, the temperature of each pole 26 connected to the tab 9 in the battery 100a can be detected, thereby preventing poles 26 with abnormal heating from being missed or misdetected, thereby improving the comprehensiveness of temperature detection.

[0136] In some embodiments, referring to FIG. 5 , the at least one second temperature measurement sampling point 812 is provided in a plurality, and the plurality of second temperature measurement sampling points 812 are spaced apart around the periphery 42. By distributing the plurality of second temperature measurement sampling points 812 spaced apart around the periphery 42, a distributed array of second temperature measurement sampling points 812 can be formed around the periphery 42, thereby effectively detecting the temperature at different locations around the periphery 42 of the battery cell group 4.

[0137] In some embodiments, the peripheral side 42 includes two first side surfaces 421 and two second side surfaces 422. The two first side surfaces 421 are disposed opposite each other, and the two second side surfaces 422 are disposed opposite each other and are respectively connected to the two first side surfaces 421. The area of ​​the first side surface 421 is larger than the area of ​​the second side surface 422. At least some of the second temperature measurement sampling points 812 are disposed in an array on at least one of the two first side surfaces 421.

[0138] The peripheral side 42 of the battery cell group 4 has at least four sides, including two larger first side surfaces 421 and two smaller second side surfaces 422. The two first side surfaces 421 are connected to the two second side surfaces 422, respectively. At least one of the two first side surfaces 421 is provided with second temperature measurement sampling points 812 in an array, thereby detecting the temperature of multiple points on the first side surface 421. The array arrangement means that the center points of the second temperature measurement sampling points 812 form a dot matrix on the surface, allowing the second temperature measurement sampling points 812 to detect the temperature over a wide range of the surface.

[0139] By arranging the second temperature measurement sampling points 812 in an array on the larger first side surface 421 of the four peripheral sides 42 of the battery cell group, the temperature detection range is increased, and the sensitivity of temperature detection at different positions on the first side surface 421 is improved, so that the temperature of each point on the first side surface 421 can be detected more comprehensively and accurately.

[0140] In some embodiments, the first side surface 421 has a length direction and a width direction, and the second temperature measurement sampling points 812 located on the same first side surface 421 are divided into multiple groups. Each group of second temperature measurement sampling points 812 is arranged at intervals along the length direction on the corresponding first side surface 421, and multiple groups of second temperature measurement sampling points 812 are arranged at intervals along the width direction to form an array arrangement.

[0141] The length direction and the width direction of the first side surface 421 are two directions perpendicular to each other, and the multiple second temperature measurement sampling points 812 arranged at intervals along the length direction are also arranged at intervals in the width direction, so that the second temperature measurement sampling points 812 are arranged in an array with a certain regularity on the first side surface 421.

[0142] Among them, the distance between two adjacent second temperature measurement sampling points 812 in each group of second temperature measurement sampling points 812 is greater than 60 mm, so as to avoid the convergence of temperature detection results caused by the overlap of the detection ranges of the two temperature measurement sampling points 81 and reduce the waste of temperature measurement sampling points 81.

[0143] By using the above method, the temperature detection range is increased by arranging the temperature sensors in an array on the larger first side surface 421 of the four peripheral sides 42 of the battery cell group, thereby improving the sensitivity of temperature detection at different positions on the first side surface 421 and enabling more comprehensive and accurate detection of the temperature of each point on the first side surface 421.

[0144] In some embodiments, referring to FIG5 , at least another portion of the second temperature measurement sampling points 812 are arranged in an array on at least one of the two second side surfaces 422. By arranging the second temperature measurement sampling points 812 in an array on at least one of the smaller second side surfaces 422 of the four peripheral sides 42 of the battery cell group, the temperature detection range can be expanded, thereby more comprehensively and accurately detecting the temperature of the four peripheral sides 42 of the battery cell group.

[0145] In some embodiments, each temperature measurement sampling point 81 is set as a section on the corresponding optical fiber 83, for example, a section of optical fiber 83 provided with a grating.

[0146] The segment length of each temperature measurement sampling point 81 is 5 to 15 mm. If the segment length of the temperature measurement sampling point 81 is too short, it is difficult to maintain the accuracy of temperature detection and is not conducive to industrial processing. If the segment length of the temperature measurement sampling point 81 is too long, although the sensitivity is stabilized and processing is easy, it will cause unnecessary material consumption. Controlling the segment length of the temperature measurement sampling point 81 between 5 and 15 mm can save production costs while ensuring sensitivity and accuracy.

[0147] Optionally, the segment length of each temperature measurement sampling point 81 can be 10 mm.

[0148] By controlling the segment length of the temperature measurement sampling point 81 between 5 and 15 mm, the cost of setting up the temperature measurement sampling point 81 and the accuracy of the temperature detection of the temperature measurement sampling point 81 can be controlled by controlling the segment length, thereby improving the sensitivity of the temperature measurement sampling point 81 while minimizing the cost of the optical fiber temperature measurement component 8.

[0149] In some embodiments, referring to FIG. 6 , FIG. 6 is a schematic diagram illustrating the structure of an electrical device according to one or more embodiments. The optical fiber temperature measurement assembly 8 further includes an optical fiber connector 82 , which is coupled to at least one optical fiber 83 . The optical fiber connector 82 extends through the housing 10a and is used to couple to an external device, thereby inputting detection light from the external device into the at least one optical fiber 83 and outputting feedback light to the external device.

[0150] The external device includes at least a light source 5 for inputting detection light into the optical fiber 83 and a demodulation module 61 for converting the feedback light output by the optical fiber 83. The optical fiber connector 82 is arranged at one end outside the shell 10a to couple with the external device, and is arranged at one end inside the shell 10a to couple with at least one optical fiber 83 of the optical fiber temperature measurement component 8.

[0151] By providing the optical fiber connector 82 , detection light can be introduced into the optical fiber 83 for detection, and the data measured by the temperature measurement sampling point 81 can be output to the outside of the housing 10 a of the battery 100 a in the form of feedback light.

[0152] In some embodiments, at least one optical fiber 83 is wound around the periphery of the battery cell group 4 , and each optical fiber 83 is coated with a bending buffer layer.

[0153] The bending buffer layer is coated on the surface of the optical fiber 83. The bending buffer layer has certain bending resistance and tensile strength, thereby reducing the probability of problems such as reduced signal transmission capability or breakage of the optical fiber 83 due to stress.

[0154] Optionally, the bending buffer layer may have a certain shock-absorbing and buffering capability, thereby reducing the probability of the optical fiber 83 being broken during vibration.

[0155] Optionally, a bending buffer layer is provided at least at the bending portion of the optical fiber 83 to reduce the risk of the optical fiber 83 being broken at the bending portion due to bending stress.

[0156] By coating the outer periphery of the optical fiber 83 with a bending buffer layer, the bending buffer layer can be used to protect the optical fiber 83 wound around the outer periphery of the battery cell group 4, thereby improving the strength of the optical fiber temperature measurement component 8 and further improving the stability of temperature detection based on the optical fiber 83.

[0157] By coating the optical fiber 83 with a bending buffer layer, the optical fiber 83 can be protected to prevent the optical fiber 83 from being broken due to stress and affecting the temperature detection effect.

[0158] In some embodiments, the bend buffer layer includes a polyimide film.

[0159] The polyimide film has excellent thermal stability, chemical corrosion resistance and mechanical properties. It has high bending strength, small creep and high tensile strength, and thus can provide a certain degree of protection for the optical fiber 83 .

[0160] Optionally, the optical fiber 83 is fixed to the outer periphery of the battery cell group 4 or to the housing 10a using adhesive. At least one optical fiber 83 of the optical fiber temperature measurement assembly 8 can be fixed to the outer periphery of the battery cell group 4 or to the inner wall of the housing 10a using adhesive, thereby fixing the optical fiber temperature measurement assembly 8 relative to the battery 100a, reducing the range of movement of the optical fiber 83 within the housing 10a and improving the stability of the optical fiber 83. Furthermore, fixing the optical fiber 83 relative to the battery 100a also helps maintain the distance between the temperature measurement sampling point 81 and the battery cell group 4, thereby making the data measured by the temperature measurement sampling point 81 more stable and accurate.

[0161] Optionally, the fixing glue may be glue or tape, such as light-cured UV glue (ultraviolet light-cured glue) or a fixing tape dedicated to the optical fiber 83 .

[0162] Optionally, the fixing glue can be a thermal conductive glue, so that while the optical fiber 83 and the battery 100a are relatively fixed, the temperature of the battery cell group 4 can be transferred to the optical fiber 83 by utilizing the thermal conductive effect, thereby enabling the temperature measurement sampling point 81 to effectively detect the temperature of the battery cell group 4.

[0163] Optionally, the optical fiber 83 may also be fixed by a fixing member such as an optical fiber clip provided inside the housing 10a.

[0164] The optical fiber 83 and the battery 100 a are relatively fixed by fixing glue, and a better fixing effect can be achieved by using the fixing glue with lower cost, thereby improving the stability of the optical fiber temperature measurement component 8.

[0165] Secondly, referring to FIG6 , the present application provides an electrical device 1b comprising a battery 100a as described above. With this arrangement, optical fiber temperature measurement components 8 can be deployed in a distributed, multi-point manner within battery 100a to achieve relatively accurate and comprehensive monitoring of the temperature within battery 100a, thereby improving the stability and reliability of the electrical device 1b.

[0166] In some embodiments, the electrical device 1b includes a light source 5 and a demodulation module 61. The light source 5 is coupled to at least one optical fiber 83 and is configured to input detection light into the at least one optical fiber 83. The demodulation module 61 is coupled to the at least one optical fiber 83 and is configured to receive feedback light output by the at least one optical fiber 83 and demodulate the feedback light to obtain a temperature measurement signal corresponding to each temperature measurement sampling point 81.

[0167] Light source 5 is used to input optical signals into optical fiber 83 and is an indispensable signal source for temperature detection using optical fiber temperature measurement assembly 8. Light source 5 can be a stable light source, a white light source, or a visible light source. The light-emitting device used can be a light-emitting diode, a laser diode, a halogen lamp, or a laser. Demodulation refers to the process of converting the optical signal transmitted in optical fiber 83 into a digital signal. The demodulation module 61 can be coupled to at least one optical fiber 83 via a receiving end to receive feedback light output by at least one optical fiber 83, thereby converting the feedback light from an optical signal into a digital signal to obtain a temperature measurement signal.

[0168] Optionally, the demodulation module 61 can be specifically provided in the optical fiber modem 6, and the optical fiber modem 6 can further include a modulation module 62. The modulation module 62 is configured to modulate the light emitted by the light source 5 using a digital signal, and input the modulated optical signal into the at least one optical fiber 83 using a transmitting end coupled to the at least one optical fiber 83.

[0169] By setting up the demodulation module 61 and the light source 5, the light source 5 can be used to input an optical signal into the optical fiber 83, and the demodulation module 61 can be used to demodulate the optical signal into a digital signal, so that the temperature measurement signal corresponding to the temperature of each temperature measurement sampling point 81 can be effectively obtained, thereby facilitating the acquisition of the temperature of each temperature measurement sampling point 81.

[0170] In some embodiments, referring to FIG. 6 , the electrical device 1 b further includes a processor 7 coupled to the demodulation module 61 for receiving a temperature measurement signal and obtaining the temperature collected by each temperature measurement sampling point 81 according to the temperature measurement signal.

[0171] The demodulation module 61 is coupled to the processor 7, thereby inputting the temperature measurement signal obtained after demodulating the feedback light into the processor 7. The processor 7 can use the different characteristics of the received temperature measurement signal to obtain the gas temperature measured by each temperature measurement sampling point 81. For example, the processor 7 determines which temperature measurement sampling point 81 measured the temperature measurement signal based on the time difference between receiving the temperature measurement signal, thereby correlating the gas temperature with the location in the battery 100a.

[0172] Optionally, the processor 7 can control the light source 5 to input detection light into the optical fiber 83 and control the demodulation module 61 to demodulate the output feedback light, thereby obtaining a real-time temperature measurement signal, thereby achieving real-time monitoring of the temperature within the battery 100a. The processor 7 can obtain multiple temperature measurement signals from the same temperature measurement sampling point 81, thereby determining the temperature change trend near the temperature measurement sampling point 81.

[0173] By providing a processor 7 coupled to the demodulation module 61 , the temperature measured at each temperature measurement sampling point 81 can be effectively calculated using the temperature measurement signal.

[0174] In some embodiments, the processor 7 is configured to generate a temperature distribution heat map of the battery 100 a according to the position of each temperature measurement sampling point 81 on the battery 100 a and the corresponding temperature.

[0175] The temperature distribution heat map is generated by processor 7 using the temperature measurement signals and a map of the locations of the temperature measurement sampling points 81 in battery 100 a. The temperature distribution heat map can be used to mark the temperatures at each location in battery 100 a where the temperature measurement sampling points 81 are located. The map must include the actual location of each temperature measurement sampling point 81 in battery 100 a and the preset temperature measured by each temperature measurement sampling point 81.

[0176] Optionally, the processor 7 may use the temperatures measured at different times by the temperature measurement sampling point 81 to update the temperature distribution heat map in real time, so as to timely grasp the temperature changes in the battery 100a.

[0177] Optionally, the temperature distribution heat map may be displayed by a display device connected to the processor 7 , so that a user can view the temperature distribution heat map through the display device and thereby understand the temperature conditions inside the battery 100 a .

[0178] Optionally, the temperature distribution heat map can be rendered by the processor 7 based on the structural diagram of the battery 100a using the temperature conditions at each temperature measurement sampling point 81. The structural diagram of the battery 100a can also be a three-dimensional model of the battery 100a.

[0179] Optionally, the temperature distribution heat map may also include information such as the time when the temperature measurement signal is obtained, the temperature change trend of the temperature measurement sampling point 81, the charge and discharge status of the battery 100a and / or the thermal runaway situation calculated based on the temperature.

[0180] By using the processor 7 to generate a temperature distribution heat map, the temperature distribution of the battery 100a can be intuitively presented in the temperature distribution heat map, which is convenient for monitoring the temperature inside the battery 100a and determining whether the battery 100a has thermal runaway based on the temperature and temperature change trend.

[0181] In some embodiments, the processor 7 is configured to determine whether an abnormality occurs in the battery 100 a based on the temperatures collected by the multiple temperature measurement sampling points 81 , and to execute corresponding early warning measures if an abnormality occurs.

[0182] Processor 7 uses the temperatures measured at multiple temperature sampling points 81 according to a preset algorithm to perform calculations to determine whether there are areas within battery 100a experiencing abnormal temperature changes, and further, to determine whether an abnormality has occurred at any location within battery 100a. Early warning measures may include processor 7 displaying information indicating an abnormality within battery 100a on a temperature distribution diagram, and / or processor 7 transmitting a message indicating an abnormality within battery 100a to a device external to battery 100a. The preset algorithm may determine whether the temperature and its changing trend meet standards based on the measured temperature and the location where the temperature was measured.

[0183] Optionally, the processor 7 may indicate the area with abnormal temperature in the battery 100 a and / or the basis for determining the abnormal temperature on the temperature distribution diagram, so as to facilitate inspection and repair of the abnormal location of the battery 100 a.

[0184] By determining whether the battery 100a is abnormal and executing corresponding warning measures when an abnormality occurs, the condition of the battery 100a can be determined according to the temperature, and a timely warning can be issued when an abnormality occurs, thereby improving the stability of the battery 100a.

[0185] Through the above method, the condition of the battery 100 a can be judged according to the temperature, and an early warning can be issued when an abnormality occurs, thereby improving the stability of the battery 100 a.

[0186] According to some embodiments of the present application, as shown in FIG7 , FIG7 is a flow chart of a battery assembly method according to one or more embodiments. The assembly method of the battery 100a of the present application described in the embodiment of the assembly method includes:

[0187] S100: Provide a battery cell group 4 and a housing 10a.

[0188] S200: Assemble the optical fiber temperature measurement assembly 8 on the periphery of the battery cell group 4. The optical fiber temperature measurement assembly 8 includes at least one optical fiber 83. The at least one optical fiber 83 has multiple temperature measurement sampling points 81, so that the multiple temperature measurement sampling points 81 are arranged at intervals on the periphery of the battery cell group 4 to form a three-dimensional temperature measurement point array, which is then used to perform temperature sampling at different positions of the battery cell group 4.

[0189] In some embodiments, at least one optical fiber 83 can be bonded to the periphery of the battery cell group 4 using thermally conductive adhesive, thereby achieving relative fixation between the at least one optical fiber 83 and the battery cell group 4. The thermally conductive adhesive not only secures the optical fiber 83 to the battery cell group 4 but also transmits the temperature of the battery cell group 4 to the optical fiber 83 through its heat conduction effect. The thermally conductive adhesive can relatively fix the optical fiber temperature measurement assembly 8 to the battery cell group 4, thereby controlling the distance between the temperature measurement sampling point 81 and the battery cell group 4, thereby ensuring more stable and accurate temperature data measured by the temperature measurement sampling point 81.

[0190] S300: After the optical fiber temperature measurement assembly 8 is assembled to the battery cell group 4, the battery cell group 4 is assembled into the housing 10a.

[0191] For matters not mentioned in the embodiment of the manufacturing method of the shell assembly of the present application, reference may be made to the relevant description of the above-mentioned battery cell embodiment, which will not be repeated here.

[0192] 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 group, comprising a top, a peripheral side and a bottom, wherein the top and the bottom are arranged opposite to each other, the peripheral side is connected between the top and the bottom, and the battery cell group is arranged inside the housing; An optical fiber temperature measurement component is arranged inside the shell, and the optical fiber temperature measurement component includes at least one optical fiber, and the at least one optical fiber has multiple temperature measurement sampling points. The multiple temperature measurement sampling points include at least one first temperature measurement sampling point and at least one second temperature measurement sampling point. The at least one temperature measurement sampling point is arranged at at least one of the top and the bottom, and the at least one second temperature measurement sampling point is arranged on the peripheral side to form a three-dimensional temperature measurement point array for temperature sampling at different positions of the battery cell group.

2. The battery according to claim 1, characterized in that The battery cell group comprises at least two battery cells, and the at least two battery cells are arranged side by side; the battery cells are provided with two poles with opposite polarities; The two poles are both located at the top, and the at least one first temperature measurement sampling point is set at the top; or, one of the two poles is set at the top and the other is set at the bottom, and the top and the bottom are respectively provided with the first temperature measurement sampling point.

3. The battery according to claim 2, characterized in that: The poles of any two adjacent battery cells are electrically connected through a bar sheet, and at least one of the first temperature measurement sampling points is set on the bar sheet.

4. The battery according to claim 3, characterized in that Each of the bars is provided with at least one of the first temperature measurement sampling points.

5. The battery according to claim 4, characterized in that A plurality of the first temperature measurement sampling points are arranged on at least one of the bar sheets, and the plurality of the first temperature measurement sampling points located on the same bar sheet are arranged at intervals along the extension direction of the corresponding bar sheet.

6. The battery according to claim 5, characterized in that The distance between any two adjacent first temperature measurement sampling points on the same bar is greater than or equal to 60 mm to 400 mm.

7. The battery according to claim 4, characterized in that At least one of the first temperature measurement sampling points is arranged on a side of the corresponding bar away from the pole and located in an area corresponding to the position of the pole.

8. The battery according to claim 7, characterized in that The bar sheet is provided with a first temperature measurement sampling point in an area corresponding to the position of each pole.

9. The battery according to claim 1, characterized in that The number of the at least one second temperature measurement sampling point is multiple, and the multiple second temperature measurement sampling points are arranged at intervals on the peripheral side.

10. The battery according to claim 6, characterized in that The peripheral side includes two first side surfaces and two second side surfaces, the two first side surfaces are arranged opposite to each other, and the two second side surfaces are arranged opposite to each other and are respectively connected to the two first side surfaces; the area of ​​the first side surface is larger than the area of ​​the second side surface; at least part of the second temperature measurement sampling points are arranged in an array manner on at least one of the two first side surfaces.

11. The battery according to claim 10, characterized in that The first side surface has a length direction and a width direction. The second temperature measurement sampling points located on the same first side surface are divided into multiple groups. Each group of the second temperature measurement sampling points is arranged at intervals on the corresponding first side surface along the length direction, and multiple groups of the second temperature measurement sampling points are arranged at intervals along the width direction to form an array arrangement; wherein the distance between two adjacent second temperature measurement sampling points in each group of the second temperature measurement sampling points is greater than 60 mm.

12. The battery according to claim 10, characterized in that At least another part of the second temperature measurement sampling points is arranged in an array on at least one of the two second side surfaces.

13. The battery according to claim 1, characterized in that Each of the temperature measurement sampling points is set as a corresponding section on the optical fiber; the section length of each of the temperature measurement sampling points is 5 mm to 15 mm.

14. The battery according to claim 1, characterized in that The optical fiber temperature measurement component also includes an optical fiber connector, which is coupled to the at least one optical fiber; the optical fiber connector is passed through the shell; the optical fiber connector is used to couple an external device to input the detection light input by the external device to the at least one optical fiber and output feedback light to the external device.

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

16. The battery according to claim 15, characterized in that The bending buffer layer includes a polyimide film; and / or the at least one optical fiber is fixed to the outer periphery of the battery cell group or to the shell by a fixing glue.

17. The battery according to claim 1, characterized in that The at least one optical fiber includes a first optical fiber and a plurality of second optical fibers, the plurality of second optical fibers are arranged on the periphery of the battery cell group, the plurality of second optical fibers are connected to the first optical fiber at intervals along the extension direction of the first optical fiber, and are optically coupled with the first optical fiber respectively; the first optical fiber is used to input the incident light of the light source into the plurality of second optical fibers respectively, and to converge and output the output light of the plurality of second optical fibers.

18. An electrical device, characterized in that: Comprising a battery as described in any one of claims 1-17.

19. The electrical device according to claim 18, characterized in that: The electrical device includes a light source and a demodulation module. The light source is coupled to the at least one optical fiber and is used to input detection light to the at least one optical fiber. The demodulation module is coupled to the at least one optical fiber and is used to receive feedback light output by the at least one optical fiber and demodulate the feedback light to obtain a temperature measurement signal corresponding to each temperature measurement sampling point.

20. The electrical device according to claim 19, characterized in that: The electrical device further includes a processor, which is coupled to the demodulation module and is configured to receive the temperature measurement signal and obtain the temperature collected at each temperature measurement sampling point according to the temperature measurement signal.

21. The electrical device according to claim 20, characterized in that: The processor is used to generate a temperature distribution heat map of the battery according to the position and corresponding temperature of each temperature measurement sampling point on the battery.

22. The electrical device according to claim 21, characterized in that: The processor is used to determine whether the battery is abnormal based on the temperatures collected by the multiple temperature measurement sampling points, and if an abnormality occurs, execute corresponding early warning measures.

23. A method for assembling a battery, characterized in that: include: Providing a battery cell group and a housing; Assembling an optical fiber temperature measurement assembly on the periphery of the battery cell group, the optical fiber temperature measurement assembly comprising at least one optical fiber, the at least one optical fiber having a plurality of temperature measurement sampling points, so that the plurality of temperature measurement sampling points are arranged at intervals on the periphery of the battery cell group to form a three-dimensional temperature measurement point matrix, and then used to perform temperature sampling on different positions of the battery cell group; After the battery cell group is assembled with the optical fiber temperature measurement assembly, the battery cell group is assembled in the housing.

24. The method according to claim 23, characterized in that The step of assembling the optical fiber temperature measurement assembly on the periphery of the battery monomer group comprises: The at least one optical fiber is bonded to the outer periphery of the battery cell group by means of heat-conductive adhesive.

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