CN116826219A

CN116826219A - Battery, power utilization device and method for assembling battery

Info

Publication number: CN116826219A
Application number: CN202311084897.6A
Authority: CN
Inventors: 吴凯; 张继君; 朱翠翠; 王少飞; 魏奕民
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-08-28
Filing date: 2023-08-28
Publication date: 2023-09-29

Abstract

The application discloses a battery, an electric device and an assembling method of the battery. The battery comprises a shell, a battery monomer group and an optical fiber temperature measuring assembly. The battery monomer group is arranged in the shell and comprises a top, a peripheral side and a bottom, wherein the top and the bottom are arranged in opposite directions, and the peripheral side is connected between the top and the bottom; the optical fiber temperature measuring assembly is arranged inside the shell and comprises at least one optical fiber, the at least one optical fiber is provided with a plurality of temperature measuring sampling points, the plurality of temperature measuring sampling points comprise at least one first temperature measuring sampling point and at least one second temperature measuring sampling point, the at least one temperature measuring sampling point is arranged at least one of the top and the bottom, the at least one second temperature measuring sampling point is arranged at the periphery to form a three-dimensional temperature measuring lattice, and the optical fiber temperature measuring assembly is used for carrying out temperature sampling on different positions of the battery monomer group. By the mode, the temperature of different positions on the battery monomer group can be obtained, and the accuracy and reliability of battery temperature measurement are improved.

Description

Battery, power utilization device and method for assembling battery

Technical Field

The application relates to the technical field of batteries, in particular to a battery, an electric device and an assembling method of the battery.

Background

With the development of battery technology, batteries with battery cell packs are applied to more and more fields, and gradually replace the traditional petrochemical energy sources in the field of automobile power. The battery cell stack may store chemical energy and controllably convert the chemical energy into electrical energy. In the recyclable battery cell group, the active material can be activated by means of charging after discharging to continue use.

However, in the actual charge and discharge process of the battery, the complete conversion of chemical energy and electric energy cannot be realized, and part of the chemical energy and electric energy is converted into heat energy, so that the temperature of the battery monomer group can be changed in the use process. In order to avoid accidents caused by abnormal temperature changes of the battery, a temperature measuring chip is arranged in the battery to monitor the temperature of the battery. Because the cost of the temperature measuring chip is high, the number of the temperature measuring chips arranged in the battery is generally small, so that the overall temperature of the battery is difficult to monitor effectively.

Disclosure of Invention

In view of the above problems, the application provides a battery, an electric device and a method for assembling the battery, which can acquire temperatures of different positions on a battery monomer group, thereby forming a three-dimensional temperature measurement lattice and improving the accuracy and reliability of battery temperature measurement.

In a first aspect, the application provides a battery comprising a housing, a battery cell stack, and an optical fiber temperature measurement assembly. The battery monomer group is arranged in the shell and comprises a top, a peripheral side and a bottom, wherein the top and the bottom are arranged in opposite directions, and the peripheral side is connected between the top and the bottom; the optical fiber temperature measuring assembly is arranged inside the shell and comprises at least one optical fiber, the at least one optical fiber is provided with a plurality of temperature measuring sampling points, the plurality of temperature measuring sampling points comprise at least one first temperature measuring sampling point and at least one second temperature measuring sampling point, the at least one temperature measuring sampling point is arranged at least one of the top and the bottom, the at least one second temperature measuring sampling point is arranged at the periphery to form a three-dimensional temperature measuring lattice, and the optical fiber temperature measuring assembly is used for carrying out temperature sampling on different positions of the battery monomer group.

Through the mode, a plurality of temperature measurement sampling points are arranged on the periphery of the battery unit group by utilizing at least one optical fiber, so that a three-dimensional temperature measurement lattice capable of sampling the temperature of different positions of the periphery of the battery unit group is formed, the temperature of different surfaces of the periphery of the battery unit group can be detected, the accuracy of battery temperature measurement is improved, and the temperature detection result is more comprehensive and reliable. Meanwhile, the temperature abnormality can be found from different positions, the position of the temperature abnormality can be conveniently determined, and the follow-up early warning and other operations can be conveniently carried out. Further, compared with a temperature measuring chip, the property of the temperature measuring component based on the optical fiber is more stable, and the probability of false alarm, missing alarm, failure and the like of the temperature measuring component is reduced.

In some embodiments, the battery cell stack includes at least two battery cells arranged side-by-side; the battery cell is provided with two polar posts with opposite polarities; the two polar posts are positioned at the top, and at least one first temperature measurement sampling point is arranged at the top; or one of the two polar posts is arranged at the top, the other polar post is arranged at the bottom, and the top and the bottom are respectively provided with a first temperature measurement sampling point.

By the method, the surface where the polar column which is easy to heat on the battery monomer is located can be subjected to temperature detection, so that the temperature can be detected more quickly and effectively.

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

Through the method, the first temperature measurement sampling point can be arranged on the bar, so that the temperature of the pole close to the bar is indirectly detected, and the accuracy and the efficiency of detecting the temperature of the easy-to-heat-generation area are improved.

In some embodiments, each of the tabs is provided with at least one first thermometry sampling point.

By the method, temperature detection can be performed on each tab, the missing of the tabs with abnormal heating conditions is avoided, and accuracy and comprehensiveness in detecting the temperature of the easily-heated area are improved.

In some embodiments, a plurality of first temperature measurement sampling points are disposed on at least one of the barks, and the plurality of first temperature measurement sampling points on the same barks are disposed at intervals along the extending direction of the corresponding barks.

By the method, accuracy and comprehensiveness of detecting the temperature of the easily-heated area are improved.

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

By the method, the temperature difference of different first temperature measurement sampling points can be reasonably controlled, and the phenomenon that measured data are identical or not comprehensive enough due to the fact that the distance between the two first temperature measurement points is too close is avoided.

In some embodiments, at least one first temperature measurement sampling point is disposed on a side of the corresponding tab facing away from the pole and in an area corresponding to a position of the pole.

The temperature of the pole is easy to rise in the charge-discharge process, and the first temperature measurement sampling point can be closer to the pole by the method, so that the pole covered by the tab can be detected more effectively and accurately in a shorter time.

In some embodiments, the tabs are provided with a first temperature measurement sampling point corresponding to the region corresponding to the position of each pole.

By the method, the pole in the battery can be detected more comprehensively, and the pole with abnormal heating is prevented from being missed.

In some embodiments, the number of the at least one second temperature measurement sampling points is a plurality, and the plurality of second temperature measurement sampling points are arranged at intervals on the periphery.

By the method, the temperatures of different positions on the periphery of the battery cell group can be effectively detected.

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

By the method, the second temperature measurement sampling points are arranged on the first side surface with the larger periphery of the battery unit group in an array mode, so that the temperatures of the points on the first side surface are detected more comprehensively.

In some embodiments, the first side has a length direction and a width direction, the second temperature measurement sampling points on the same first side are divided into a plurality of groups, each group of second temperature measurement sampling points is arranged on the corresponding first side at intervals along the length direction, and the plurality of groups of second temperature measurement sampling points are arranged at intervals along the width direction so as to be arranged in an array; and the distance between two adjacent second temperature measurement sampling points in each group of second temperature measurement sampling points is larger than 60mm.

In some embodiments, at least another portion of the second temperature measurement sampling points are disposed in an array on at least one of the two second sides.

By the method, the second temperature measurement sampling points are arranged on the second side face of the smaller battery cell group on the periphery side in an array mode, so that the temperatures of the points on the second side face are detected more comprehensively.

In some embodiments, each thermometry sampling point is set as a segment on a respective optical fiber; the section length of each temperature measurement sampling point is 5-15 mm.

By the method, the cost of setting the temperature measuring sampling point and the accuracy of detecting the temperature of the temperature measuring sampling point can be controlled by controlling the length of the section, so that the sensitivity of the temperature measuring sampling point is improved, and the cost of the optical fiber temperature measuring assembly is reduced.

In some embodiments, the fiber optic temperature measurement assembly further comprises a fiber optic connector coupled to the at least one optical fiber; the optical fiber connector is arranged on the shell in a penetrating way; the optical fiber connector is used for being coupled with external equipment so as to input detection light input by the external equipment to at least one optical fiber and output feedback light to the external equipment.

By the method, the detection light can be input into the optical fiber, the temperature is detected by the optical fiber temperature measuring component, and the data measured by the temperature measuring sampling point is output to the outside of the battery.

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

By the method, the optical fiber is protected by coating the bending buffer layer outside the optical fiber, so that the probability of fiber breakage caused by bending stress on the optical fiber is reduced, and the influence of stress breakage on the temperature detection effect is avoided.

In some embodiments, the bend buffer layer comprises a polyimide film; and/or at least one optical fiber is fixed on the periphery of the battery cell group or the shell through a fixing adhesive.

By the method, a good optical fiber fixing effect can be achieved by using the fixing glue with low cost, and the strength of the optical fiber and the stability of the temperature measuring sampling point are improved.

In some embodiments, 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 disposed at the periphery of the battery cell group, and the plurality of second optical fibers are connected with the first optical fiber at intervals along the extending direction of the first optical fiber and are optically coupled with the first optical fiber respectively; the first optical fibers are used for respectively inputting the incident light of the light source into the plurality of second optical fibers and converging and outputting the emergent light of the plurality of second optical fibers.

According to the method, the first optical fibers are utilized to introduce the incident light of the light source into the plurality of second optical fibers, the emergent light of the plurality of second optical fibers is output, and the plurality of second optical fibers are utilized to detect the temperature of the periphery of the battery monomer group, so that the temperature detection range is enlarged, the temperature detection comprehensiveness is improved, and the temperature of a plurality of positions of the battery can be monitored more accurately.

In a second aspect, the present application provides an electrical device comprising a battery as defined in any one of the preceding claims.

In some embodiments, the power device includes a light source coupled to at least one optical fiber for inputting detection light to the at least one optical fiber and a demodulation module; the demodulation module is coupled with at least one optical fiber, and is used for receiving feedback light output by the at least one optical fiber and demodulating the feedback light so as to obtain a temperature measurement signal corresponding to each temperature measurement sampling point.

By the method, the temperature measurement signal of each sampling point can be effectively obtained, and the temperature of each sampling point can be conveniently obtained.

In some embodiments, the power device further includes a processor coupled to the demodulation module for receiving the temperature measurement signal and obtaining the temperature collected at each temperature measurement sampling point according to the temperature measurement signal.

By the method, the temperature of each temperature measurement sampling point can be obtained by using the temperature measurement signal.

In some embodiments, the processor is configured to generate a thermal map of the temperature distribution of the battery based on the location of each temperature-sensing sampling point on the battery and the corresponding temperature.

By the method, the temperature distribution of the battery can be intuitively presented.

In some embodiments, the processor is configured to determine whether an abnormality occurs in the battery according to temperatures acquired by the plurality of temperature measurement sampling points, and if the abnormality occurs, execute a corresponding early warning measure.

By the method, the condition of the battery can be judged according to the temperature, and early warning is carried out when abnormality occurs, so that the stability of the battery is improved.

In a third aspect, the present application provides a method of assembling a battery, comprising: providing a battery cell group and a shell; the optical fiber temperature measuring assembly is assembled on the periphery of the battery monomer group, the optical fiber temperature measuring assembly comprises at least one optical fiber, and the at least one optical fiber is provided with a plurality of temperature measuring sampling points, so that the plurality of temperature measuring sampling points are arranged on the periphery of the battery monomer group at intervals to form a three-dimensional temperature measuring lattice, and the three-dimensional temperature measuring lattice is further used for carrying out temperature sampling on different positions of the battery monomer group; after the battery monomer is assembled and the optical fiber temperature measuring assembly is assembled, the battery monomer group is assembled in the shell.

In some embodiments, at least one optical fiber is bonded to the outer perimeter of the battery cell stack by a thermally conductive adhesive.

Through the mode, the better optical fiber fixing effect is realized by utilizing the heat conducting adhesive, so that the optical fiber and the battery monomer group are relatively fixed, and the strength of the optical fiber temperature measuring assembly and the stability of the temperature measuring sampling point are improved.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic structural view of a vehicle according to one or more embodiments;

fig. 2 is an exploded view of a battery according to one or more embodiments;

Fig. 3 is an exploded view of a battery cell according to one or more embodiments;

FIG. 4 is a schematic diagram of a structure of two battery cells and an optical fiber temperature measurement assembly in accordance with one or more embodiments;

FIG. 5 is a schematic diagram of a battery cell stack and an optical fiber temperature measurement assembly according to one or more embodiments;

FIG. 6 is a schematic diagram of a structure of an electrical device according to one or more embodiments;

fig. 7 is a flow diagram of a method of assembling a battery in accordance with one or more embodiments.

Reference numerals in the specific embodiments are as follows:

1000a of a vehicle;

a 100a battery; 200a controllers; 300a motor;

10a housing; 11a first part; 12a second part; 13a accommodating space;

1, a battery cell; 1b an electric device;

a 21 end plate; 22 housings; 221 open end; 23 electrode assembly; 23a pole ear; 26 pole; 4, a battery monomer group; 41 top; 42 weeks side; 421 first side; 422 a second side; 43 bottom; 5 a light source; 6 an optical fiber modem; 61 a demodulation module; 62 a modulation module; a processor; 8, an optical fiber temperature measuring assembly; 81 temperature measurement sampling points; 811 a first temperature measurement sampling point; 812 second temperature measurement sampling point; 82 fiber optic connectors; 83 optical fibers; 83a first optical fiber; 83b a second optical fiber; 9 bar.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

However, in the actual charge and discharge process of the battery, the complete conversion of chemical energy and electric energy cannot be realized, and part of the chemical energy and electric energy is converted into heat energy, so that the temperature of the battery cell stack is changed in the using process. Uncontrollable abnormal changes in the temperature of the battery may also be referred to as thermal runaway, where dangerous accidents such as self-explosion, spontaneous combustion, etc., may occur. In order to effectively monitor the temperature of the battery and avoid the occurrence of such accidents, a temperature measuring chip is currently arranged in the battery to detect the temperature of the battery cell group.

However, the inventors have noted that the number of temperature sensing chips provided on the battery cell stack is generally small due to the high cost of the temperature sensing chips, and thus the battery cells cannot be effectively monitored at a plurality of locations. On the other hand, the stability of the temperature measuring chip has certain defects, and false alarm phenomenon can occur after a period of use.

In order to improve the effect of monitoring the temperature of the battery everywhere, an optical fiber temperature measuring assembly can be arranged in the shell to measure the temperature. The optical fiber temperature measuring assembly comprises at least one optical fiber, a plurality of temperature measuring sampling points can be arranged on the at least one optical fiber, and the plurality of temperature measuring sampling points are arranged on the periphery of the battery monomer group at intervals to form a three-dimensional temperature measuring lattice, so that the optical fiber temperature measuring assembly can be used for temperature sampling of different positions of the battery monomer group.

Based on the above considerations, the present application provides a battery and an electrical device. The optical fiber temperature measuring assembly is arranged in the shell of the battery, so that a three-dimensional temperature measuring lattice is formed at the periphery of the battery unit group by utilizing a plurality of temperature measuring sampling points on the optical fiber, and temperature sampling is carried out on different positions of the battery unit group. Therefore, the temperature information of temperature detection in the battery is more diversified, and the accuracy and the reliability of temperature measurement are improved.

The battery and the power utilization device disclosed by the embodiment of the application can be used for a power utilization device using the battery as a power supply or various energy storage systems using the battery as an energy storage element. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000 a.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to one or more embodiments. The vehicle 1000a may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle. The battery 100a is provided inside the vehicle 1000a, and the battery 100a may be provided at the bottom or the head or the tail of the vehicle 1000 a. The battery 100a may be used for power supply of the vehicle 1000a, for example, the battery 100a may be used as an operating power source of the vehicle 1000 a. The vehicle 1000a may also include a controller 200a and a motor 300a, the controller 200a being configured to control the battery 100a to power the motor 300a, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000 a.

In some embodiments of the application, battery 100a may not only serve as an operating power source for vehicle 1000a, but also as a driving power source for vehicle 1000a, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000 a.

In some embodiments, battery 100a may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

The battery 100a according to the embodiment of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

In the embodiment of the present application, the battery cell 1 may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material by charging after discharging the battery cell and continue to use. Each battery cell 1 may also be a primary battery.

The battery cell 1 includes, but is not limited to, a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, and the like. The battery cell 1 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

In some embodiments, the battery 100a may include a battery cell group, and when there are a plurality of battery cells 1, the plurality of battery cells 1 are arranged and fixed to form one battery cell group.

In some embodiments, referring to fig. 2, the battery 100a may be a battery pack, which includes a housing 10a and a battery cell 1, where the battery cell 1 or the battery cell group 4 is accommodated in an accommodating space 13a formed inside the housing 10 a.

In some embodiments, the housing 10a may be part of the chassis structure of the vehicle 1000 a. For example, a portion of the housing 10a may become at least a portion of the floor of the vehicle 1000a, or a portion of the housing 10a may become at least a portion of the cross and side members of the vehicle 1000 a.

Referring to fig. 2, fig. 2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments. The battery 100a includes a case 10a and a battery cell 1, and the battery cell 1 is accommodated in the case 10 a. The housing 10a is used to provide the accommodating space 13a for the battery cell 1, and the housing 10a may have various structures. In some embodiments, the housing 10a may include a first portion 11a and a second portion 12a, the first portion 11a and the second portion 12a being mutually covered, the first portion 11a and the second portion 12a together defining a receiving space 13a for receiving the battery cell 1. The second portion 12a may be a hollow structure with one end opened, the first portion 11a may be a plate-shaped structure, and the first portion 11a covers the opening side of the second portion 12a, so that the first portion 11a and the second portion 12a together define the accommodating space 13a; the first portion 11a and the second portion 12a may be hollow structures each having an opening at one side, and the opening side of the first portion 11a is covered with the opening side of the second portion 12 a. Of course, the housing 10a formed by the first portion 11a and the second portion 12a may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 100a, the plurality of battery cells 1 may be connected in series, parallel or a series-parallel connection between the plurality of battery cells 1, and the series-parallel connection refers to both of the plurality of battery cells 1. The plurality of battery cells 1 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 1 is accommodated in the shell 10 a; of course, the battery 100a may also be a form that a plurality of battery cells 1 are connected in series or parallel or in series-parallel to form a battery cell group 4, and then the plurality of battery cell groups 4 are connected in series or parallel or in series-parallel to form a whole and are accommodated in the housing 10 a. The battery 100a may further include other structures, for example, the battery 100a may further include a tab for making electrical connection between the plurality of battery cells 1.

Wherein each battery cell 1 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 1 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

Referring to fig. 3, fig. 3 is a schematic diagram illustrating an exploded structure of a battery cell according to one or more embodiments. Fig. 3 is a schematic exploded view of a battery cell 1 according to some embodiments of the present application. The battery cell 1 refers to the smallest unit constituting the battery. As shown in fig. 3, the battery cell 1 includes an end plate 21, a case 22, an electrode assembly 23, and other functional components.

The end plate 21 refers to a member that is covered on the open end of the case 22 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end plate 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end plate 21 may be made of a material having a certain hardness and strength (such as an aluminum alloy), so that the end plate 21 is not easy to deform when being extruded and collided, so that the battery cell 1 can have a higher structural strength, and the safety performance can be improved. The end plate 21 may be provided with functional components such as electrode terminals 21 a. The electrode terminals 21a may be used to be electrically connected with the electrode assembly 23 for outputting or inputting electric power of the battery cell 1. In some embodiments, an explosion-proof valve for releasing the internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold value may be further provided on the end plate 21. The material of the end plate 21 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application. In some embodiments, insulation may also be provided on the inside of the end plate 21, which may be used to isolate electrical connection components within the housing 22 from the end plate 21 to reduce the risk of short circuits. By way of example, the insulation may be plastic, rubber, or the like.

The case 22 is an assembly for cooperating with the end plate 21 to form an internal environment of the battery cell 1, wherein the formed internal environment may be used to accommodate the electrode assembly 23, the electrolyte, and other components. The case 22 and the end plate 21 may be separate members, and an opening may be provided in the case 22, and the interior of the battery cell 1 may be formed by covering the opening with the end plate 21 at the opening. It is also possible to integrate the end plate 21 and the housing 22, but specifically, the end plate 21 and the housing 22 may form a common connection surface before other components are put into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end plate 21 is then covered with the housing 22. The housing 22 may be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc.

Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiment of the present application.

The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 1. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode sheets having the active material constitute the main body portion of the electrode assembly 23, and the portions of the positive and negative electrode sheets having no active material constitute the tab 23a, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. During charge and discharge of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 23a is connected to the electrode terminal to form a current loop.

Referring to fig. 2-5, fig. 4 is a schematic structural diagram of two battery cells and an optical fiber temperature measurement assembly according to one or more embodiments, according to some embodiments of the present application. Fig. 5 is a schematic diagram of a battery cell stack and an optical fiber temperature measurement assembly according to one or more embodiments. The application provides a battery 100a, wherein the battery 100a comprises a shell 10a, a battery cell group 4 and an optical fiber temperature measuring assembly 8. The battery cell 1 is disposed inside the case 10 a; the optical fiber temperature measuring assembly 8 is arranged inside the shell 10a and comprises at least one optical fiber 83, the at least one optical fiber 83 is provided with a plurality of temperature measuring sampling points 81, the plurality of temperature measuring sampling points 81 are arranged on the periphery of the battery unit group 4 at intervals to form a three-dimensional temperature measuring lattice, and the optical fiber temperature measuring assembly 8 is used for carrying out temperature sampling on different positions of the battery unit group 4.

Optionally, the number of the optical fibers 83 may be one, one optical fiber 83 may be wound around the periphery of the battery monomer unit 4, and may be specifically fixed by using a heat-conducting adhesive, and a specific winding manner may be determined according to an actual temperature measurement requirement, and examples of the location where the temperature measurement sampling point 81 is set in this embodiment are also provided below. Alternatively, the number of the optical fibers 83 may be multiple, and the multiple optical fibers 83 may be integrated, that is, the multiple optical fibers 83 (may be considered as a branch) may be disposed on the outer periphery of the battery unit group 4, and finally, the optical fibers may be converged onto another independent optical fiber 83 (may be considered as a main path), and for example, an optical fiber coupler may be used for the convergence of the specific converging optical fibers. The integrated optical fiber 83 may finally have an interface for optically coupling to the outside for receiving a light source or outputting light.

The optical fiber temperature measuring device 8 is a device that obtains temperature sensing information by modulating the Bragg wavelength of the optical fiber 83 with the ambient temperature, and is capable of detecting the ambient temperature from the change of the optical signal in the optical fiber 83. The temperature measurement sampling points 81 may be grating structures arranged in the optical fiber 83 at intervals along the extending direction of the optical fiber 83, so that the optical signal input into the optical fiber 83 can sequentially pass through each temperature measurement sampling point 81 along the optical fiber 83, and thus the temperatures of different positions of the battery unit 4 can be detected at each temperature measurement sampling point 81.

The plurality of temperature measurement sampling points 81 arranged on the periphery of the battery cell group 4 are not arranged on the same plane, so that the plurality of temperature measurement sampling points 81 can form a three-dimensional temperature measurement lattice. Compared with a temperature sensor on a plane, the three-dimensional temperature measurement lattice comprising a plurality of temperature measurement sampling points 81 has relatively diversified temperature measurement positions, and the arrangement in a three-dimensional space can also promote the difference of the detection range of each temperature measurement sampling point 81; meanwhile, as the arrangement cost of the temperature measurement sampling points 81 is lower than that of a common temperature sensor, the three-dimensional temperature measurement lattice and the temperature measurement sampling points 81 with a large number can be utilized to detect the temperature in a large range, and the accuracy and the reliability of temperature measurement are improved.

The judgment basis of the temperature measurement sampling points 81 on different planes can be as follows: the center points of the temperature measurement sampling points 81 are connected with each other, and whether the temperature measurement sampling points 81 are arranged on the same plane is judged by forming a plurality of line segments through the connection. The outer periphery of the battery unit 4 may refer to a space between the outer surface of the battery unit 4 and the inner wall of the housing 10a, and the optical fiber 83 may be disposed in the space, for example, wound around the outer surface of the battery unit 4, so that the temperature measuring and sampling point 81 may detect the temperature of a certain area in the space.

Alternatively, the detection object of the temperature measurement sampling point 81 may be the temperature of the gas near the temperature measurement sampling point 81 and/or the temperature of the battery cell group 4 to which the temperature measurement sampling point 81 is close, and the temperature measurement range thereof is a three-dimensional space region centered on the center point of the temperature measurement sampling point 81.

Optionally, the plurality of temperature measurement sampling points 81 are all disposed on the optical fiber 83, so that the space occupied by the first temperature measurement sampling point 811 is smaller than that of the past temperature measurement chip, and the cost is lower, and meanwhile, the optical fiber 83 has a certain flexibility, so that the layout position is more flexible, thereby being beneficial to the targeted layout in the battery 100 a.

Alternatively, the length of the section occupied by the thermometric sampling points 81 on the optical fiber 83 may be 5mm to 15mm. Specifically, this value may take 10mm.

Through utilizing at least one optic fibre 83 to set up a plurality of temperature measurement sampling points 81 at the group battery 4 periphery to constitute the three-dimensional temperature measurement lattice that can carry out temperature sampling to the different positions of group battery 4, can monitor the temperature in the battery 100a comparatively comprehensively, be favorable to promoting battery 100a temperature measurement's accuracy. Further, the property of the optical fiber temperature measuring component 8 is more stable than that of the temperature measuring chip, the cost for setting one temperature measuring sampling point 81 is lower than that for setting one temperature measuring chip, the cost for monitoring the temperature of the battery 100a is reduced, the probability of false alarm, missing alarm, failure and the like of the temperature measuring component is also reduced, and the reliability of temperature measurement is improved.

According to some embodiments of the present application, referring to fig. 2, the battery cell group 4 includes a top 41, a peripheral side 42, and a bottom 43, the top 41 and the bottom 43 being disposed opposite to each other, the peripheral side 42 being connected between the top 41 and the bottom 43. The plurality of temperature measurement sampling points 81 includes 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 being disposed at least one of the top 41 and the bottom 43, the at least one second temperature measurement sampling point 812 being disposed at the peripheral side 42.

Three different names of the top 41, the peripheral side 42 and the bottom 43 may be taken for distinguishing between different positions of the outer periphery of the battery cell stack 4. The top 41 and the bottom 43 may be named with reference to the actual mounting direction of the battery cell stack 4 inside the case 10a, the top 41 and the bottom 43 are opposite ends in the vertical direction, the top 41 is above and the bottom 43 is below, and the peripheral side 42 is a generic term for other surfaces connecting the two ends of the top 41 and the bottom 43. The first temperature measurement sampling point 811 can detect the temperature of at least one of the top 41 and the bottom 43, and the second temperature measurement sampling point 812 can detect the temperature of the peripheral side 42, so that a three-dimensional temperature measurement lattice that detects the temperature near the outer periphery of the battery cell group 4 can be formed.

For example, the top 41 may be provided with at least one optical fiber 83, the at least one optical fiber 83 having a first temperature measurement sampling point 811, respectively. The peripheral side 42 may also be provided with at least one optical fiber 83, and the at least one optical fiber 83 has a second temperature measurement sampling point 812, respectively. Of course, the bottom 43 may also be provided with at least one optical fiber 83. The optical fibers 83 disposed on the top 41, the peripheral side 42 and the bottom 43 may be integrated into an additional optical fiber 83 (the optical fiber coupler may be used for the optical fiber temperature measuring component 8, that is, the optical fiber coupler may be included), so as to implement light source input and disperse the light into the optical fibers 83, or the light output by the optical fibers 83 may be converged onto the additional optical fiber 83.

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

In some embodiments, referring to fig. 6, the at least one optical fiber 83 includes a first optical fiber 83a and a plurality of second optical fibers 83b, the plurality of second optical fibers 83b are disposed at the outer circumference of the battery cell group 4, and the plurality of second optical fibers 83b are connected to the first optical fiber 83a at intervals along the extending direction of the first optical fiber 83a and are optically coupled to the first optical fibers 83a, respectively. The first optical fibers 83a are configured to input the incident light of the light source 5 to the plurality of second optical fibers 83b, and to collect and output the outgoing light of the plurality of second optical fibers 83 b.

The first optical fibers 83a can be used for introducing the incident light of the light source 5 into the plurality of second optical fibers 83b and outputting the emergent light of the plurality of second optical fibers 83b, so that the temperature of the periphery of the battery monomer group 4 can be detected by utilizing the plurality of second optical fibers 83b, the temperature detection range is enlarged, the temperature detection comprehensiveness is improved, and the temperature of a plurality of positions in the battery 100a can be monitored more accurately.

Through setting up first temperature measurement sampling point 811 at top 41 and/or bottom 43, set up second temperature measurement sampling point 812 at week side 42, can detect the temperature of the different sides of battery unit group 4 periphery for there is a plurality of temperature measurement sampling points 81 for the data that temperature detection obtained is more comprehensive, and then can reduce the condition that leads to because of temperature sensor quantity is too few, temperature data singleness misdetection, missed detection.

In some embodiments, referring to fig. 4, the battery cell stack 4 includes at least two battery cells 1, with at least two battery cells 1 disposed side-by-side. The battery cell 1 is provided with two poles 26 of opposite polarity. Both poles 26 are located at the top 41, and at least one first temperature measurement sampling point 811 is disposed at the top 41. Alternatively, one of the two poles 26 is disposed at the top 41, the other is disposed at the bottom 43, and the top 41 and the bottom 43 are respectively provided with a first temperature measurement sampling point 811.

The battery cell 1 is the minimum unit for energy storage and output, and chemical reaction can occur in the battery cell 1, so that the purpose of finishing the mutual conversion of electric energy and chemical energy in the battery cell 1 and then outputting and storing energy is achieved. The plurality of battery cells 1 are connected in series, parallel or series-parallel to form a battery cell group 4, so that the capacity of the battery 100a can be improved. The post 26 may be disposed on the housing 22 and/or the end plate 21 of the battery cell 1 and exposed inside the case 10a through the top 41 and/or the bottom 43 of the battery cell stack 4. One end of the pole 26 is connected with the electrode assembly 23 and/or electrolyte in the battery cell 1, and the other end is connected with a conductor outside the battery cell 1, so that the circuit in the battery cell 1 is connected with an external circuit, and a circuit for transmitting current can be formed. 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 generate heat when current passes through.

By arranging the first temperature measurement sampling points 811 for the top 41 and/or the bottom 43 provided with the polar posts 26, the top 41 and/or the bottom 43 where the polar posts 26 which are easy to heat on the battery cell 1 are located can be subjected to temperature detection, and the temperature near the polar posts 26 can be detected more quickly and effectively, so that the sensitivity and the accuracy of temperature detection are improved.

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

When the number of the battery cells 1 is two or more, the tabs 9 may be used to connect the poles 26 of the two battery cells 1, and the tabs 9 are conductors having a certain heat conduction capability, and may generate heat when a current is passed. According to different polarities, the polar posts 26 comprise positive polar posts and negative polar posts, and when the positive polar posts and the negative polar posts of different battery cells 1 are connected by using the tabs 9, at least two battery cells 1 are connected in parallel. When the positive electrode column of one battery cell 1 is connected with the negative electrode column of the other battery cell 1, at least two battery cells 1 are connected in series.

In order to improve the connection tightness, short circuit or disconnection at the connection position between the pole 26 and the tab 9 is avoided, and the tab 9 can be mutually fixed with the pole 26 through welding, so that part of the surface area of the pole 26 is covered by the tab 9 when the pole 26 is connected with the tab 9, and the first temperature measurement sampling point 811 is not convenient to be directly arranged on the pole 26. Therefore, the first temperature measurement sampling point 811 may be provided on the bar 9, so that the temperature near the pole 26 that is liable to generate heat is also indirectly detected while the temperature of the bar 9 is detected.

Through set up first temperature measurement sampling point 811 on the tab 9 of electric connection utmost point post 26 to utilize the heat transfer ability of tab 9 to carry out temperature detection to the utmost point post 26 that is connected with tab 9 indirectly, can detect the temperature to the utmost point post 26 that connects tab 9, promoted the accuracy of detecting the easy heating area temperature in the battery 100 a.

In some embodiments, each of the tabs 9 is provided with at least one first thermometric sampling point 811. Each tab 9 is connected with at least two polar posts 26, and through setting up at least one first temperature measurement sampling point 811 on each tab 9, can all carry out temperature detection to each tab 9, and then avoid the circumstances of generating heat to appear unusual polar post 26 and tab 9 by the omission, promoted the accuracy and the comprehensiveness of detecting easy heating area temperature.

In some embodiments, a plurality of first temperature measurement sampling points 811 are disposed on at least one of the patches 9, and a plurality of first temperature measurement sampling points 811 on the same patch 9 are disposed at intervals along the extending direction of the corresponding patch 9.

The space occupied when the existing temperature measuring chip is arranged is large, the space on the tab 9 is limited, a plurality of temperature measuring chips are inconvenient to arrange, and the cost for arranging the plurality of temperature measuring chips is high. The optical fiber temperature measuring assembly 8 only needs to arrange the optical fibers 83 on the patch 9, which occupies a smaller space and has lower cost, so that the plurality of first temperature measuring sampling points 811 are arranged at intervals along the extending direction of the patch 9 without barriers.

The extending direction of the strip 9 is the direction of the connecting line between at least two polar posts 26 connected with the strip 9, and when a plurality of first temperature measurement sampling points 811 are arranged at intervals along the extending direction of the strip 9, the first temperature measurement sampling points 811 can detect the temperatures of a plurality of areas on the strip 9, so that the temperature detection range is enlarged, and the accuracy and the comprehensiveness of detecting the temperatures of the easy-to-heat areas are improved.

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 60mm to 400mm.

Specifically, when the interval 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, so that the detection results of the two temperature measurement sampling points 81 converge, which may cause waste of the temperature measurement sampling points 81. When the interval 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, so that the temperature between the two temperature measurement sampling points 81 cannot be detected well, the probability of missed detection and false detection is improved, and the accuracy and the comprehensiveness of temperature detection are not facilitated. The distance between the 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, and the distance can be set according to the distance between the poles 26 of the two battery cells 1 connected by the tabs 9 and the detection range of the first temperature measurement sampling points 811, so that the distance between the two adjacent first temperature measurement sampling points 811 can be controlled within a reasonable range.

Alternatively, the interval between two adjacent first temperature measurement sampling points 811 may be 63.3mm.

Alternatively, the spacing between two adjacent first temperature measurement sampling points 811 may be 72.3mm.

Optionally, the distance between the first temperature measurement sampling point 811 near the front end and/or the tail end of the patch 9 and the front end and/or the tail end of the patch 9 is 0 mm-20 mm.

By controlling the distance between two adjacent first temperature measurement sampling points 811, the superposition condition of the detection areas of the adjacent first temperature measurement sampling points 811 can be reduced, and the difference of the temperature measurement objects of different first temperature measurement sampling points 811 can be further controlled, so that the condition that the measured data of the adjacent first temperature measurement sampling points 811 are converged is reduced, and the waste of the first temperature measurement sampling points 811 is avoided.

In some embodiments, referring to fig. 4, at least one first temperature measurement sampling point 811 is disposed on a side of the corresponding tab 9 facing away from the pole 26 and in an area corresponding to the position of the pole 26.

Alternatively, in the case where the specifications of the battery cells 1 are uniform and the first temperature measurement sampling points 811 need to be provided for each of the poles 26, the interval between the adjacent two first temperature measurement sampling points 811 may be the dimension of the battery cell 1 in the extending direction of the tab 9, so that the first temperature measurement sampling points 811 can detect the temperature of the poles 26.

The side of the tab 9 close to the pole 26 needs to be connected with the pole 26, so that it is inconvenient to directly set a first temperature measurement sampling point 811 on this side or the pole 26, and a side surface of the tab 9 facing away from the pole 26 is exposed in the housing 10a, and by setting the first temperature measurement sampling point 811 on the surface corresponding to the pole 26, more effective and accurate temperature detection can be performed on the pole 26 covered by the tab 9.

In some embodiments, the bar 9 is provided with a first temperature measurement sampling point 811 corresponding to the region corresponding to the position of each pole 26. Through setting up first temperature measurement sampling point 811 to the position of every utmost point post 26 on the bar 9, can carry out temperature detection to every utmost point post 26 that is connected with bar 9 in the battery 100a, and then can avoid appearing the utmost point post 26 that the unusual condition of generating heat by the leak detection, the false detection, promote temperature detection's comprehensiveness.

In some embodiments, referring to fig. 5, the number of the at least one second temperature measurement sampling points 812 is plural, and the plurality of second temperature measurement sampling points 812 are disposed at intervals on the peripheral side 42. By arranging the plurality of second temperature measurement sampling points 812 at intervals on the peripheral side 42, an array of distributed second temperature measurement sampling points 812 can be formed on the peripheral side 42, and further, the temperatures of different positions on the peripheral side 42 of the battery cell group 4 can be effectively detected.

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 to each other, and the two second side surfaces 422 are disposed opposite to each other and are connected to the two first side surfaces 421, respectively. The area of the first side 421 is larger than the area of the second side 422. At least a portion of the second temperature measurement sampling points 812 are disposed on at least one of the two first sides 421 in an array manner.

The peripheral side 42 of the battery cell group 4 has at least four surfaces, including two first side surfaces 421 having a larger area and two second side surfaces 422 having a smaller area, and the two first side surfaces 421 are respectively connected to the two second side surfaces 422. At least one of the two first sides 421 is provided with second temperature-measuring sampling points 812 in an array manner, so as to detect the temperatures of multiple points on the first sides 421. The array means that the center point of the second temperature measurement sampling point 812 forms a lattice on the surface, so that the second temperature measurement sampling point 812 can detect a wide range of temperatures on the surface.

Through with second temperature measurement sampling point 812 with the array mode setting at the great first side 421 of battery monomer group 4 week side 42 to make the temperature detection scope increase, promote the sensitivity to the temperature detection of different positions on first side 421, can more comprehensively and accurately detect the temperature of each point on first side 421.

In some embodiments, the first side 421 has a length direction and a width direction, the second temperature measurement sampling points 812 located on the same first side 421 are divided into a plurality of groups, each group of second temperature measurement sampling points 812 is disposed on the corresponding first side 421 at intervals along the length direction, and the plurality of groups of second temperature measurement sampling points 812 are arranged at intervals along the width direction so as to be arranged in an array.

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

The distance between two adjacent second temperature measurement sampling points 812 in each group of second temperature measurement sampling points 812 is greater than 60mm, so that the convergence of temperature detection results caused by the coincidence of detection ranges of the two temperature measurement sampling points 81 can be avoided as much as possible, and the waste of the temperature measurement sampling points 81 is reduced.

By the method, the first side 421 with larger periphery 42 of the battery unit 4 is arranged in an array manner, so that the temperature detection range is enlarged, the sensitivity of temperature detection at different positions on the first side 421 is improved, and the temperature of each point on the first side 421 can be detected more comprehensively and accurately.

In some embodiments, referring to fig. 5, at least another portion of the second temperature measurement sampling points 812 are disposed in an array on at least one of the two second sides 422. By disposing the second temperature measurement sampling points 812 in an array manner on at least one second side 422 of the battery cell group 4, which is smaller in the peripheral side 42, the temperature detection range can be enlarged, thereby detecting the temperature of the peripheral side 42 of the battery cell group 4 more comprehensively and accurately.

In some embodiments, each thermometric sampling point 81 is provided as a section on a respective optical fiber 83, for example a length of optical fiber 83 provided with a grating.

The section length of each temperature measurement sampling point 81 is 5-15 mm. The section length of the temperature measurement sampling point 81 is too short, so that the accuracy of temperature detection is difficult to maintain, and the industrial processing and production are not facilitated. If the section length of the temperature measurement sampling point 81 is too long, the sensitivity is stabilized and the processing is easy, but unnecessary material consumption is caused. The section length of the temperature measurement sampling point 81 is controlled to be 5-15 mm, so that the production cost is saved, and the sensitivity and the accuracy are ensured.

Alternatively, the section length of each temperature measurement sampling point 81 may be 10mm.

The section length of the temperature measurement sampling point 81 is controlled to be 5-15 mm, so that the cost of setting the temperature measurement sampling point 81 and the accuracy of detecting the temperature of the temperature measurement sampling point 81 can be controlled by controlling the section length, and the cost of the optical fiber temperature measuring assembly 8 can be reduced as much as possible while the sensitivity of the temperature measurement sampling point 81 is improved.

In some embodiments, referring to fig. 6, fig. 6 is a schematic structural diagram of an electrical device according to one or more embodiments. The fiber optic thermometry assembly 8 further includes a fiber optic connector 82, the fiber optic connector 82 being coupled to at least one optical fiber 83. The optical fiber connector 82 is disposed through the housing 10a, and the optical fiber connector 82 is used for coupling with an external device, so as to input the detection light input by the external device to the at least one optical fiber 83 and output the feedback light to the external device.

The external device at least comprises a light source 5 for inputting detection light to the optical fiber 83 and a demodulation module 61 for converting feedback light output by the optical fiber 83, wherein one end of the optical fiber connector 82 arranged outside the shell 10a is coupled with the external device, and one end of the optical fiber connector 82 arranged inside the shell 10a is coupled with at least one optical fiber 83 of the optical fiber temperature measuring assembly 8.

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

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 covered with a bending buffer layer.

The bending buffer layer is coated on the surface of the optical fiber 83, and has a certain bending resistance and stretching resistance, so that the probability that the optical fiber 83 is reduced in signal transmission capacity or broken due to stress is reduced.

Alternatively, the bending buffer layer may have a certain shock absorbing and buffering capacity, so as to reduce the probability of breakage or the like of the optical fiber 83 during vibration.

Optionally, a bend buffer layer is disposed at least at the bend of the optical fiber 83 to reduce the risk of breakage of the optical fiber 83 at the bend due to bending stress.

Through the buffer layer of buckling at optic fibre 83 periphery cladding, can utilize the buffer layer protection of buckling around locating the optic fibre 83 of battery monomer group 4 periphery, promote the intensity of optic fibre temperature measurement subassembly 8, and then can promote and detect the stability based on optic fibre 83 to the temperature.

By coating the bending buffer layer outside the optical fiber 83, the optical fiber 83 can be protected, and the influence of stress fracture of the optical fiber 83 on the temperature detection effect can be avoided.

In some embodiments, the bend buffer layer comprises a polyimide film.

The polyimide film has excellent thermal stability, chemical corrosion resistance and mechanical property, and has higher bending strength, smaller creep amount and higher tensile strength, thereby playing a certain role in protecting the optical fiber 83.

Alternatively, the optical fiber 83 is fixed to the outer circumference of the battery cell group 4 or the case 10a by a fixing adhesive. At least one optical fiber 83 of the optical fiber temperature measuring assembly 8 can be fixed on the periphery of the battery unit group 4 or the inner wall of the shell 10a through fixing glue, so that the optical fiber temperature measuring assembly 8 and the battery 100a are relatively fixed, the moving amplitude of the optical fiber 83 in the interior of the shell 10a is reduced, and the stability of the optical fiber 83 is improved. Meanwhile, the optical fiber 83 and the battery 100a are relatively fixed, so that a certain effect can be achieved on keeping the distance between the temperature measuring sampling point 81 and the battery monomer set 4, and the data measured by the temperature measuring sampling point 81 are more stable and accurate.

Alternatively, the fixing adhesive may be glue or tape, such as uv light curing adhesive (uv light curing adhesive) or fixing tape dedicated to the optical fiber 83.

Optionally, the fixing glue may be a heat-conducting glue, so that the temperature of the battery unit group 4 can be conducted onto the optical fiber 83 by utilizing the heat-conducting effect while the optical fiber 83 and the battery 100a are relatively fixed, and then the temperature measuring and sampling point 81 can effectively detect the temperature of the battery unit group 4.

Alternatively, the optical fiber 83 may be fixed by a fixing member such as a fiber buckle provided inside the housing 10 a.

The optical fiber 83 and the battery 100a are relatively fixed through the fixing adhesive, so that a good fixing effect can be realized by using the fixing adhesive with low cost, and the stability of the optical fiber temperature measuring assembly 8 is improved.

In a second aspect, referring to fig. 6, the present application provides an electrical device 1b comprising a battery 100a as described in any of the above. By means of the arrangement, distributed and multi-point arrangement can be carried out in the battery 100a by utilizing the optical fiber temperature measuring assembly 8, accurate and comprehensive monitoring of the temperature in the battery 100a is achieved, and therefore stability and reliability of the power utilization device 1b are improved.

In some embodiments, the power consumption device 1b includes a light source 5 and a demodulation module 61, where the light source 5 is coupled to at least one optical fiber 83 for inputting detection light to 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 the feedback light outputted from 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.

The light source 5 is a signal source necessary for detecting the temperature by the optical fiber temperature measuring device 8, and is used for inputting an optical signal to the optical fiber 83. The light source 5 may be a stable light source, a white light source, or a visible light source, and the light emitting device used may be a light emitting diode, a laser diode, a halogen tungsten lamp, or a laser. Demodulation refers to the process of converting the optical signal transmitted through the optical fiber 83 with a digital signal. The demodulation module 61 can be coupled to the at least one optical fiber 83 by using a receiving end to receive the feedback light outputted by the at least one optical fiber 83, so as to convert the feedback light from an optical signal to a digital signal, and obtain a temperature measurement signal.

Alternatively, the demodulation module 61 may be specifically disposed in the optical fiber modem 6, and the optical fiber modem 6 may further include the modulation module 62. The modulation module 62 is configured to modulate light emitted from the light source 5 with a digital signal, and input the modulated light signal into the at least one optical fiber 83 by using a transmitting end coupled to the at least one optical fiber 83.

By providing the demodulation module 61 and the light source 5, the light source 5 can be used to input the optical signal to 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, and the temperature of each temperature measurement sampling point 81 can be conveniently obtained.

In some embodiments, referring to fig. 6, the power consumption device 1b further includes a processor 7, where the processor 7 is coupled to the demodulation module 61, and is configured to receive the temperature measurement signal, and obtain the temperature collected by each temperature measurement sampling point 81 according to the temperature measurement signal.

The demodulation module 61 is coupled to the processor 7, so that the temperature measurement signal obtained after demodulating the feedback light is input to the processor 7, and the processor 7 can obtain the gas temperature measured by each temperature measurement sampling point 81 by using different characteristics of the received temperature measurement signal. For example, the processor 7 determines from the time difference of the received temperature measurement signals which temperature measurement sampling points 81 the temperature measurement signals are respectively measured, thereby associating the temperature of the gas with the position in the battery 100 a.

Optionally, the processor 7 may control the light source 5 to input the detection light into the optical fiber 83, and control the demodulation module 61 to demodulate the output feedback light, so as to obtain a real-time temperature measurement signal, thereby implementing real-time monitoring of the temperature in the battery 100 a. The processor 7 may acquire a plurality of temperature measurement signals of the same temperature measurement sampling point 81, so as to obtain a trend of temperature variation around the temperature measurement sampling point 81.

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

In some embodiments, processor 7 is configured to generate a thermal map of the temperature distribution of battery 100a based on the location of each thermometry sampling point 81 on battery 100a and the corresponding temperature.

The temperature distribution heat map is rendered by the processor 7 using the temperature measurement signal and the position map of the temperature measurement sampling point 81 in the battery 100a, and the temperature of each place where the temperature measurement sampling point 81 is provided in the battery 100a can be identified in the temperature distribution heat map. The actual position of each temperature measurement sampling point 81 in the battery 100a needs to be included in the figure, and the preset temperature measured by each temperature measurement sampling point 81.

Alternatively, the processor 7 may update the temperature distribution heat map in real time by using the temperatures measured at different times at the temperature measurement sampling point 81, so as to grasp the change situation of the temperature in the battery 100a in time.

Alternatively, the temperature distribution heat map may be displayed by a display device connected to the processor 7, so that the user can grasp the temperature condition in the battery 100a by viewing the temperature distribution heat map through the display device.

Alternatively, the temperature distribution heat map may be rendered by the processor 7 on the basis of the structure diagram of the battery 100a using the temperature conditions at the respective temperature-measuring sampling points 81. The structure of battery 100a may be a three-dimensional model of battery 100 a.

Optionally, the temperature distribution heat map may further include information such as a time when the temperature measurement signal is acquired, a trend of temperature change of the temperature measurement sampling point 81, a charge/discharge state of the battery 100a, and/or a thermal runaway condition calculated from the temperature.

By generating the temperature distribution heat map by the processor 7, the temperature distribution of the battery 100a can be intuitively presented in the temperature distribution heat map, facilitating monitoring of the temperature inside the battery 100a and determining whether thermal runaway of the battery 100a occurs according to the temperature and the trend of change in temperature.

In some embodiments, the processor 7 is configured to determine whether the battery 100a is abnormal according to the temperatures acquired by the plurality of temperature measurement sampling points 81, and if so, execute corresponding early warning measures.

The processor 7 calculates the temperatures measured by the plurality of temperature measurement sampling points 81 according to a preset algorithm, so as to determine whether a region in which the temperature is abnormally changed exists in the battery 100a, and further determine whether an abnormality occurs in the position in the battery 100 a. The early warning measures may be that the processor 7 displays information that the battery 100a is abnormal in the temperature distribution map, and/or the processor 7 sends a message that the battery 100a is abnormal to the outside of the battery 100 a. The preset algorithm may be to judge whether the temperature and the change trend of the temperature meet the standard according to the measured temperature and the position of the measured temperature.

Optionally, the processor 7 may indicate the region of the abnormal temperature and/or the basis for determining the abnormal temperature in the battery 100a in the temperature distribution map, so as to perform maintenance on the abnormal position of the battery 100 a.

By judging whether the battery 100a is abnormal or not and executing corresponding early warning measures when the battery 100a is abnormal, the condition of the battery 100a can be judged according to the temperature, and early warning can be performed in time when the battery 100a is abnormal, so that the stability of the battery 100a is improved.

By the method, the condition of the battery 100a can be judged according to the temperature, and early warning is carried out when abnormality occurs, so that the stability of the battery 100a is improved.

According to some embodiments of the application, as shown in fig. 7, fig. 7 is a flow diagram of a method of assembling a battery according to one or more embodiments. The assembly method described in the embodiment of the assembly method of the battery 100a of the present application includes:

s100: a battery cell stack 4 and a case 10a are provided.

S200: the optical fiber temperature measuring assembly 8 is assembled on the periphery of the battery monomer set 4, the optical fiber temperature measuring assembly 8 comprises at least one optical fiber 83, the at least one optical fiber 83 is provided with a plurality of temperature measuring sampling points 81, the plurality of temperature measuring sampling points 81 are arranged on the periphery of the battery monomer set 4 at intervals to form a three-dimensional temperature measuring lattice, and then the three-dimensional temperature measuring lattice is used for carrying out temperature sampling on different positions of the battery monomer set 4.

In some embodiments, the at least one optical fiber 83 may be adhered to the outer periphery of the battery cell group 4 by a heat conductive adhesive, so as to achieve the relative fixation of the at least one optical fiber 83 and the battery cell group 4. The heat conductive adhesive can relatively fix the optical fiber 83 and the battery cell group 4, and simultaneously, the temperature of the battery cell group 4 can be conducted to the optical fiber 83 by utilizing the heat conductive effect. The heat-conducting adhesive can relatively fix the optical fiber temperature measuring assembly 8 and the battery cell group 4, so that the distance between the temperature measuring sampling point 81 and the battery cell group 4 is controlled, and the temperature data measured by the temperature measuring sampling point 81 is more stable and accurate.

S300: after the battery cell stack 4 is assembled with the optical fiber temperature measuring assembly 8, the battery cell stack 4 is assembled within the housing 10 a.

For details not mentioned in the embodiments of the method for manufacturing a housing assembly according to the present application, reference may also be made to the descriptions related to the foregoing embodiments of the battery cells, which are not repeated herein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising:

a housing;

the battery unit group comprises a top, a peripheral side and a bottom, wherein the top and the bottom are oppositely arranged, the peripheral side is connected between the top and the bottom, and the battery unit group is arranged in the shell;

the optical fiber temperature measuring assembly is arranged inside the shell and comprises at least one optical fiber, the at least one optical fiber is provided with a plurality of temperature measuring sampling points, the plurality of temperature measuring sampling points comprise at least one first temperature measuring sampling point and at least one second temperature measuring sampling point, the at least one temperature measuring sampling point is arranged at least one of the top and the bottom, and the at least one second temperature measuring sampling point is arranged at the periphery to form a three-dimensional temperature measuring lattice and is used for carrying out temperature sampling on different positions of the battery unit group.

2. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the battery monomer group comprises at least two battery monomers, and the at least two battery monomers are arranged side by side; the battery cell is provided with two polar posts with opposite polarities;

the two polar posts are positioned at the top, and the at least one first temperature measurement sampling point is arranged at the top; or one of the two polar posts is arranged at the top, the other polar post is arranged at the bottom, and the top and the bottom are respectively provided with the first temperature measurement sampling points.

3. The battery of claim 2, wherein the battery is provided with a plurality of electrodes,

any two adjacent battery monomer's utmost point post respectively through the bar piece electricity connection, at least one first temperature measurement sampling point set up in the bar piece.

4. The battery of claim 3, wherein the battery is provided with a battery cell,

each of the tabs is provided with at least one first temperature measurement sampling point.

5. The battery of claim 4, wherein the battery is provided with a plurality of electrodes,

at least one of the tabs is provided with a plurality of first temperature measurement sampling points, and the plurality of first temperature measurement sampling points on the same tab are arranged at intervals along the extending direction of the corresponding tab.

6. The battery of claim 5, wherein the battery is configured to provide the battery with a battery cell,

the distance between any two adjacent first temperature measurement sampling points on the same bar sheet is greater than or equal to 60-400 mm.

7. The battery of claim 4, wherein the battery is provided with a plurality of electrodes,

at least one first temperature measurement sampling point is arranged at one side of the corresponding tab, which is away from the pole, and is positioned in an area corresponding to the position of the pole.

8. The battery of claim 7, wherein the battery is configured to provide the battery with a battery cell,

and the first temperature measurement sampling points are correspondingly arranged in the areas corresponding to the positions of the polar posts of the tabs.

9. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the number of the at least one second temperature measurement sampling points is multiple, and the plurality of the second temperature measurement sampling points are arranged on the periphery at intervals.

10. The battery of claim 6, wherein the battery is configured to provide the battery with a battery cell,

the periphery side comprises two first side surfaces and two second side surfaces, the two first side surfaces are oppositely arranged, and the two second side surfaces are oppositely arranged and are respectively connected with the two first side surfaces; the area of the first side surface is larger than that of the second side surface; at least part of the second temperature measurement sampling points are arranged on at least one of the two first side surfaces in an array mode.

11. The battery of claim 10, wherein the battery is configured to provide the battery with a plurality of cells,

the first side surface is provided with a length direction and a width direction, the second temperature measurement sampling points positioned on the same first side surface are divided into a plurality of groups, each group of second temperature measurement sampling points is arranged on the corresponding first side surface at intervals along the length direction, and the plurality of groups of second temperature measurement sampling points are arranged at intervals along the width direction so as to be arrayed; and the distance between two adjacent second temperature measurement sampling points in each group of second temperature measurement sampling points is larger than 60mm.

12. The battery of claim 10, wherein the battery is configured to provide the battery with a plurality of cells,

at least another part of the second temperature measurement sampling points are arranged on at least one of the two second side surfaces in an array mode.

13. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

each temperature measuring sampling point is set as a section on the corresponding optical fiber; the section length of each temperature measurement sampling point is 5 mm-15 mm.

14. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the optical fiber temperature measuring assembly further comprises an optical fiber connector, wherein the optical fiber connector is coupled with the at least one optical fiber; the optical fiber connector is arranged on the shell in a penetrating way; the optical fiber connector is used for being coupled with external equipment so as to input detection light input by the external equipment to the at least one optical fiber and output feedback light to the external equipment.

15. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the at least one optical fiber is wound on the periphery of the battery monomer group, and each optical fiber is coated with a bending buffer layer.

16. The battery of claim 15, wherein the battery is configured to provide the battery with a plurality of cells,

the bending buffer layer comprises a polyimide film; and/or the at least one optical fiber is fixed on the periphery of the battery cell group or the shell through a fixing adhesive.

17. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the at least one optical fiber comprises a first optical fiber and a plurality of second optical fibers, the second optical fibers are arranged on the periphery of the battery monomer group, the second optical fibers are connected with the first optical fiber at intervals along the extending direction of the first optical fiber, and are respectively optically coupled with the first optical fiber; the first optical fibers are used for respectively inputting the incident light of the light source into the plurality of second optical fibers and converging and outputting the emergent light of the plurality of second optical fibers.

18. An electrical device comprising a battery as claimed in any one of claims 1 to 17.

19. An electrical device according to claim 18, wherein,

the power utilization device comprises a light source and a demodulation module, wherein the light source is coupled with the at least one optical fiber and is used for inputting detection light to the at least one optical fiber; the demodulation module is coupled with the at least one optical fiber, and is used for receiving feedback light output by the at least one optical fiber and demodulating the feedback light to obtain a temperature measurement signal corresponding to each temperature measurement sampling point.

20. An electrical device according to claim 19, wherein,

The power utilization device further comprises a processor, wherein the processor is coupled with the demodulation module and is used for receiving the temperature measurement signals and obtaining the temperature acquired by each temperature measurement sampling point according to the temperature measurement signals.

21. An electrical device according to claim 20, wherein,

the processor is used for generating 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.

22. An electrical device according to claim 21, wherein,

and the processor is used for judging whether the battery is abnormal or not according to the temperatures acquired by the temperature measuring sampling points, and executing corresponding early warning measures if the battery is abnormal.

23. A method of assembling a battery, comprising:

providing a battery cell group and a shell;

the optical fiber temperature measuring assembly is assembled on the periphery of the battery monomer group, the optical fiber temperature measuring assembly comprises at least one optical fiber, and the at least one optical fiber is provided with a plurality of temperature measuring sampling points, so that the plurality of temperature measuring sampling points are arranged on the periphery of the battery monomer group at intervals to form a three-dimensional temperature measuring lattice, and the three-dimensional temperature measuring lattice is further used for carrying out temperature sampling on different positions of the battery monomer group;

And after the battery cell is assembled and assembled with the optical fiber temperature measuring assembly, assembling the battery cell group in the shell.

24. The method of claim 23, wherein the step of determining the position of the probe is performed,

the assembling of the optical fiber temperature measuring assembly on the periphery of the battery cell group comprises the following steps:

and bonding the at least one optical fiber to the periphery of the battery cell group through heat-conducting glue.