CN218241948U

CN218241948U - Battery system, electric equipment and energy storage system

Info

Publication number: CN218241948U
Application number: CN202222765541.6U
Authority: CN
Inventors: 陈文汉; 王少飞; 魏奕民
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2023-01-06
Anticipated expiration: 2032-10-20

Abstract

The battery system comprises a single battery, a Raman probe, a laser generator and a Raman spectrometer, wherein at least part of the Raman probe is arranged in the single battery; the laser generator is connected with the Raman probe and used for outputting laser; the Raman probe is used for outputting laser to the interior of the battery cell; the Raman spectrometer is connected with the Raman probe and is used for receiving Raman light which is input by the Raman probe and is formed by laser light after scattering. By adopting the technical scheme, the Raman probe is arranged in the battery monomer and is respectively connected with the laser generator and the Raman spectrometer, so that the microstructure of the internal substance of the battery monomer can be monitored in real time, and the charging and discharging conditions of the battery monomer can be monitored in real time.

Description

Battery system, electric equipment and energy storage system

Technical Field

The application belongs to the technical field of batteries, and more particularly relates to a battery system, electric equipment and an energy storage system.

Background

In the charging and discharging process of the battery, the microstructure of the internal substance of the battery changes, for example, the material composition, the form and the like of the substances such as the pole piece and the electrolyte in the battery change, and it can be understood that the change of the microstructure of the internal substance of the battery can reflect the charging and discharging capability of the battery, and when the change is abnormal, the abnormality and the failure of the substances such as the pole piece and the electrolyte in the battery can also be reflected. However, there is no device capable of monitoring the change of the microstructure of the battery in the related art, so that the battery cannot be maintained in time when the charging and discharging of the battery are abnormal.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, embodiments of the present application provide a battery system, an electric device, and an energy storage system, which aim to solve the technical problem in the related art that it is difficult to timely maintain a battery when the battery is abnormally charged or discharged.

In a first aspect, an embodiment of the present application provides a battery system, including:

a battery cell;

the Raman probe is at least partially arranged inside the battery cell;

the laser generator is connected with the Raman probe and used for outputting laser; the Raman probe is used for outputting laser to the interior of the battery cell;

and the Raman spectrometer is connected with the Raman probe and is used for receiving Raman light which is input by the Raman probe and is formed by laser light after scattering.

The battery system that this application embodiment provided, the free inside of battery is located to at least part of raman probe, in use, laser output to the free inside of battery behind the raman probe that laser generator sent, then form raman light through the free inside material scattering of battery, and in raman probe input to raman spectrometer, raman spectrometer handles this raman light, the analysis, in order to obtain the change of the free inside material's of battery micro-structure, so can carry out real-time supervision to the change of the micro-structure of the inside material of battery, with the charge-discharge condition of real-time supervision battery, be convenient for carry out timely maintenance work to the battery when the charging and discharging of battery appears unusually like this.

In some embodiments, the raman probe comprises:

the output optical fiber is connected with the laser generator;

the input optical fiber is connected with the Raman spectrometer;

the first protective sleeve is at least wrapped on the part, located inside the battery monomer, of the output optical fiber and the part, located inside the battery monomer, of the input optical fiber, and the first protective sleeve has electrolyte corrosion resistance.

Through adopting above-mentioned technical scheme, on the one hand, the first protective sheath of accessible carries out cladding, constraint effect to output fiber and input fiber, the use of the raman probe of being convenient for. On the other hand, the first protective sleeve can protect the output optical fiber and the input optical fiber and avoid the corrosion of the electrolyte on the output optical fiber and the input optical fiber.

In some embodiments, the number of input optical fibers is provided in plurality, and the plurality of input optical fibers are arranged around the outer circumference of the output optical fiber.

By adopting the technical scheme, the Raman light formed by scattering can be better scattered into the input optical fiber and then input into the Raman spectrometer through the input optical fiber, so that the utilization rate of laser can be improved, and the accuracy of the component change of the internal substances of the battery monomer obtained by analyzing and processing through the Raman spectrometer is improved.

In some embodiments, the raman probe further includes a second protective sheath, and the second protective sheath is disposed in the first protective sheath and covers at least a portion of the output optical fiber inside the battery cell.

Through adopting above-mentioned technical scheme to make and keep apart certain distance through the second protective sheath between output fiber and the input fiber, make the raman light that the scattering formed can scatter to input fiber better like this, and input to the raman spectrometer through input fiber.

In some embodiments, the wall thickness of the first protective sheath and/or the second protective sheath is in the range of 80 to 500 μm.

By adopting the technical scheme, on the one hand, the outer diameter of the Raman probe is not too large on the basis that the first protective sleeve has a better protective effect on the input optical fiber and the output optical fiber, so that the Raman probe is conveniently packaged in the battery cell, and on the other hand, the Raman light is conveniently input into the Raman spectrometer through the input optical fiber.

In some embodiments, the raman probe further comprises a filter connected to the first protective sheath and covering an end of the output fiber remote from the laser generator and an end of the input fiber remote from the raman spectrometer.

The non-Raman light in the single battery can be effectively filtered through the optical filter, so that the non-Raman light is prevented from being input into the Raman spectrometer through the input optical fiber, and the accuracy of the component change of the internal substances of the single battery, which is obtained through analysis and processing of the Raman spectrometer, is improved.

In some embodiments, the thickness of the optical filter is in a range of 100 to 1000 μm.

By adopting the technical scheme, the thickness of the optical filter is not too large, the problem of poor light signal output effect caused by the over-thick optical filter is avoided, the thickness of the optical filter is not too small, and the filtering of background light by the optical filter is facilitated.

In some embodiments, the Raman probe is in the shape of a shaft, and the diameter of the Raman probe ranges from 600 to 1200 μm.

Through adopting above-mentioned technical scheme for the raman probe has great diameter, so that the inside of raman probe can hold input fiber and output fiber of sufficient quantity, does benefit to the output of laser and the input work of raman light, and, makes the diameter of raman probe be unlikely to too big, and the encapsulation of raman probe in battery monomer inside of being convenient for reduces battery monomer's weeping risk.

In some embodiments, the number of the battery cells is multiple, the raman probes are arranged inside the multiple battery cells, and each raman probe is connected to the laser generator and the raman spectrometer.

Through adopting above-mentioned technical scheme to make a laser generator can shine laser to a plurality of battery monomers, a raman spectroscopy appearance can carry out real-time supervision to the micro-structure change of a plurality of battery monomer's inside material simultaneously, thereby carries out real-time supervision to the charge-discharge condition of a plurality of battery monomers.

In some embodiments, a battery cell includes a package member, an electrode assembly disposed within the package member, and an electrolyte disposed within the package member; the end face of the raman probe is facing the electrode assembly, and/or the end of the raman probe is immersed in the electrolyte.

By adopting the technical scheme, the Raman probe can irradiate the electrode assembly and/or the electrolyte, so that the real-time monitoring work of the microstructure of the electrode assembly and/or the electrolyte is realized.

In some embodiments, a plurality of raman probes are disposed inside the battery cell, an end face of at least one of the raman probes faces a pole piece of the electrode assembly, and an end of at least one of the raman probes is immersed in the electrolyte.

The second aspect of the embodiment of the present application provides an electric device, which includes a device body and a battery system, wherein a battery cell of the battery system is electrically connected to the device body and is used for supplying power to the device body.

By adopting the technical scheme, the Raman probe is arranged in the battery monomer and is respectively connected with the laser generator and the Raman spectrometer, so that the microstructure of the internal substance of the battery monomer can be monitored in real time, and the charging and discharging conditions of the battery monomer can be monitored in real time.

A third aspect of the embodiments of the present application provides an energy storage system, which includes a cabinet and a battery system, where the battery system is disposed in the cabinet.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic illustration of a vehicle provided in accordance with some embodiments of the present application;

fig. 2 is a schematic diagram of a battery provided in some embodiments of the present application;

fig. 3 is a schematic diagram of a battery system provided in some embodiments of the present application;

fig. 4 is a cross-sectional view of a raman probe provided in accordance with some embodiments of the present application from a first perspective;

fig. 5 is a partial cross-sectional view of a raman probe provided in accordance with some embodiments of the present application from a second perspective.

Wherein, in the figures, the respective reference numerals:

1000-a vehicle; 100-a battery system; 200-a controller; 300-a motor; 10-a battery; 11-a battery cell; 111-a package; 112-an electrode assembly; 12-a box body; 121-a first housing; 122-a second housing; 20-a raman probe; 21-an output fiber; 22-input fiber; 23-a first protective sheath; 24-a second protective sheath; 25-an optical filter; 30-a laser generator; 40-Raman spectrometer; 50-a computer; 60-a first optical fiber; 70-a second optical fiber; 80-third optical fiber.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the description of the present application, "a plurality" means two or more, and "two or more" includes two unless specifically defined otherwise. Accordingly, "multiple groups" means more than two groups, including two groups.

In the description of the present application, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, a and/or B, may mean: there are three cases of A, A and B, and B. In addition, in the present application, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship.

In the related art, during the charging and discharging processes of the battery, the microstructure of substances inside the battery may change, for example, the microstructure of substances such as a pole piece, a diaphragm, and an electrolyte inside the battery may change, where the change of the microstructure of the pole piece and the electrolyte specifically includes a change of a material composition and a form. For example, during the charging and discharging process of the battery, the stretching vibration frequency of the phosphorus-oxygen bond of the positive electrode plate changes, and for example, the stretching vibration frequency of the carbon-oxygen bond of the electrolyte also changes. It can be understood that the change of the microstructure of the internal substance of the battery can reflect the change of the charge and discharge capacity of the battery, and when the change is abnormal, the abnormal or failure of the pole piece, the diaphragm, the electrolyte and the like in the battery can also be reflected.

However, there is no device capable of monitoring the change of the microstructure of the internal material of the battery, so that the battery cannot be maintained in time when the charging and discharging of the battery are abnormal.

Based on the above considerations, in order to solve the above problems, the inventors have conducted an in-depth study, and designed a battery system, that is, the battery system mentioned in the embodiment of the present application, in which a raman probe is extended into a single battery cell, and the raman probe is connected to a laser generator and a raman spectrometer respectively, so that laser light emitted by the laser generator can be output to the inside of the single battery cell through the raman probe to irradiate internal substances of the single battery cell and be scattered under the action of the internal substances of the single battery cell to form raman light, and then the raman light is input into the raman spectrometer through the raman probe and is analyzed and processed by the raman spectrometer, so as to obtain changes in the microstructure of the internal substances of the single battery cell, thereby enabling real-time monitoring of changes in the microstructure of the internal substances of the battery cell, so as to implement real-time monitoring of charging and discharging conditions of the single battery cell, and thus solving a technical problem that real-time monitoring of the charging and discharging conditions of the single battery cell cannot be currently performed, thereby facilitating timely maintenance work of the single battery cell when the charging and discharging capabilities of the single battery are abnormal.

The battery system provided by the first aspect of the embodiments of the present application may be used for various energy storage systems that use a battery as power for power supply or use a battery as an energy storage element.

The energy storage system can be an energy storage container or an energy storage electric cabinet.

The powered device may be, but is not limited to, a cell phone, tablet, laptop, electric toy, electric tool, vehicle, ship, spacecraft, etc. The electric toy may include a stationary or mobile electric toy such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like. As shown in fig. 1 to 3, a battery system 100 is provided inside a vehicle 1000. The battery system 100 includes a battery 10, and the battery 10 may be disposed at the bottom or the head or the tail of the vehicle 1000. The battery 10 may be used for power supply of the vehicle 1000, and for example, the battery 10 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 10 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

In some embodiments of the present application, the battery 10 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1000.

As shown in fig. 2, the battery 10 includes a battery cell 11 and a case 12, and the battery cell 11 is disposed in the case 12. The case 12 has a space for accommodating the battery cell 11 therein, and the case 12 may have various structures. In some embodiments, the case 12 includes a first case 121 and a second case 122, and the first case 121 and the second case 122 cover each other and together define a space for accommodating the battery cell 11. The first housing 121 may be a hollow structure with an opening at one end, the second housing 122 is a plate-shaped structure, and the second housing 122 covers the opening side of the first housing 121, so that the first housing 121 and the second housing 122 jointly define a space for accommodating the battery cell 11; alternatively, each of the first case 121 and the second case 122 may be a hollow structure having an opening at one end, and as shown in fig. 2, the opening side of the first case 121 is covered with the opening side of the second case 122, so that the first case 121 and the second case 122 jointly define a space for accommodating the battery cell 11. In addition, the case 12 formed by the first casing 121 and the second casing 122 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 10, the number of the battery cells 11 may be one or multiple, and the plurality of battery cells 11 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to that the plurality of battery cells 11 are connected in series or in parallel. In some embodiments, as shown in fig. 2, a plurality of battery cells 11 may be directly connected in series, in parallel, or in series-parallel to form a whole, and then the whole formed by the plurality of battery cells 11 is accommodated in the box 12; of course, in other embodiments, the plurality of battery cells 11 may also be connected in series, in parallel, or in series-parallel to form a plurality of modules, and the outer peripheral side of each module is further provided with an end plate, a side plate, and other structures to form a battery module, that is, the plurality of battery cells 11 form a plurality of battery modules, and the plurality of battery modules are further connected in series, in parallel, or in series-parallel to form a whole and are accommodated in the box 12. In addition, the battery 10 may further include other structures, such as a bus member for electrically connecting the plurality of battery cells 11 and the plurality of battery modules.

Here, the battery cell 11 refers to a minimum unit that stores and outputs electric energy.

As shown in fig. 2 and 3, the battery cell 11 is a secondary battery that can be charged and discharged, and for example, the battery cell 11 may be a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery. The battery cell 11 may be a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the like, that is, the battery cell 11 may be a cylindrical battery, a pouch battery, a prismatic battery or other batteries.

As shown in fig. 3, the battery cell 11 includes a package member 111, an electrode assembly 112, an electrolyte, and other related components.

The package member 111 is a component for forming an internal environment of the battery cell 11, and the internal environment of the package member 111 is for accommodating the electrode assembly 112, the electrolyte, and other related components. When the battery cell 11 is a pouch battery, the package member 111 may be an aluminum plastic film, as shown in fig. 3; when the battery cell 11 is a prismatic battery or a cylindrical battery, the package member 111 may be a prismatic case or a cylindrical case.

The electrode assembly 112 is a part in which electrochemical reactions occur in the battery cell 11, and one or more electrode assemblies 112 may be disposed inside the package member 111 of the battery cell 11. The electrode assembly 112 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet with a separator interposed therebetween. The positive pole piece and the negative pole piece have active material parts which form a main body part of the electrode assembly, the positive pole piece and the negative pole piece do not have active material parts which form tabs respectively, the tab of the positive pole piece is a positive tab, the tab of the negative pole piece is a negative tab, and the positive tab and the negative tab can be located at one end of the main body part together or located at two ends of the main body part respectively. The tab is a current transmission end of the electrode assembly 112 for charging and discharging.

The electrolyte infiltrates the electrode assembly 112, and the positive and negative active materials react with the electrolyte during charging and discharging of the battery 10. For example, when the battery cell 11 is a lithium ion battery, during the charging process of the battery 10, the lithium ions of the positive electrode plate move to the negative electrode plate through the electrolyte and are embedded in the negative active material of the negative electrode plate, and during the discharging process of the battery 10, the lithium ions of the negative electrode plate move to the positive electrode plate through the electrolyte and are embedded in the positive active material of the positive electrode plate.

It should be added that, during the charging and discharging processes of the battery 10, the movement of the lithium ions and the lithium ions respectively react with the positive electrode sheet, the negative electrode sheet, the electrolyte, and the like, so that the microstructures of the positive electrode sheet, the negative electrode sheet, the separator, and the electrolyte may change, for example, the stretching vibration frequency of the phosphorus-oxygen bond of the positive electrode sheet may change, and the stretching vibration frequency of the carbon-oxygen bond of the electrolyte may also change. Wherein the change in the microstructure is monitored by raman scattering.

Referring to fig. 3, the battery system 100 according to the embodiment of the present disclosure includes a battery 10, a raman probe 20, a laser generator 30, and a raman spectrometer 40. The battery 10 includes a battery cell 11. At least a part of the raman probe 20 is provided inside the battery cell 11. The laser generator 30 is connected to the raman probe 20 and outputs laser light. The raman probe 20 is configured to output laser light output from the laser generator 30 to the inside of the battery cell 11, and the laser light is scattered by a substance inside the battery cell 11 to form raman light. The raman spectrometer 40 is connected to the raman probe 20 and is configured to receive raman light formed by laser light scattering input from the raman probe 20.

The raman effect, also called raman scattering, is a phenomenon in which a frequency of a light wave changes after being scattered. Specifically, when a laser beam with a certain frequency is irradiated onto an object to be irradiated, energy transfer occurs between molecules and photons in the object to be irradiated, the vibration state changes in different ways and degrees, and then light with different frequencies is scattered, the scattered light with different frequencies is referred to as raman light, and the change in frequency determines the characteristics of the object to be irradiated, so that the change in the material composition and the form of the object to be irradiated can be obtained, in other words, the characteristics of the object to be irradiated, including the change in the material composition and the form of the object to be irradiated, can be obtained by processing and analyzing the raman light. Based on this, when the laser irradiates internal substances such as the electrolyte, the pole piece, and the diaphragm of the single battery 11, the laser may be scattered to form raman light, and the raman light may reflect changes in the form of the material components of the internal substances of the single battery 11, for example, when the laser irradiates the positive pole piece, the raman light formed by scattering through the positive pole piece may reflect changes in the microstructure of the positive pole piece, such as changes in the tensile vibration frequency of the phosphorus-oxygen bond of the positive pole piece, and when the laser irradiates the electrolyte, the raman light formed by scattering through the electrolyte may reflect changes in the microstructure of the electrolyte, such as changes in the tensile vibration frequency of the carbon-oxygen bond. In addition, when the laser irradiates other internal substances of the battery cell 11 except the positive electrode plate and the electrolyte, the raman light formed by laser scattering can reflect the change of the microstructure of the other internal substances, which is not described herein again.

The laser generator 30 refers to a device capable of emitting laser light. The laser generator 30 is connected to the raman probe 20, so that laser light emitted from the laser generator 30 can be irradiated through the raman probe 20 to an environment where the raman probe 20 is located, for example, an electrolyte of the battery cell 11, an internal substance such as the electrode assembly 112, and the like.

The raman spectrometer 40 is a device that analyzes and processes raman light to study the composition of a substance. After the laser is input to the raman spectrometer 40 through the raman probe 20, the raman spectrometer 40 can analyze and process the raman light, so as to perform composition research on the internal substance of the battery cell 11 irradiated by the laser, thereby obtaining the material composition and the form change of the internal substance.

The raman probe 20 refers to a photoconductive medium capable of passing laser light and raman light. Optionally, the raman probe 20 is in an elongated shape, a portion of the raman probe 20 extends into the battery cell 11, another portion of the raman probe 20 is located outside the battery cell 11, specifically, an end portion of the raman probe 20 away from the laser generator 30 and the raman spectrometer 40 extends into the battery cell 11, and a portion of the raman probe 20 located outside the battery cell 11 is respectively connected to the laser generator 30 and the raman spectrometer 40, so that laser light emitted by the laser generator 30 can be output to the inside of the battery cell 11 through the raman probe 20, and raman light can be input into the raman spectrometer 40 through the raman probe 20. In addition, as shown in fig. 3, the entire structure of the raman probe 20 may be located inside the battery cell 11, rather than a part thereof being located inside the battery cell 11.

The laser generator 30 and the raman spectrometer 40 may both be connected to the raman probe 20 through a light guide medium such as an optical fiber, that is, both the laser generator 30 and the raman probe 20 and the raman spectrometer 40 and the raman probe 20 are indirectly connected, specifically, as shown in fig. 3, the laser generator 30 is connected to the first optical fiber 60, the raman spectrometer 40 is connected to the second optical fiber 70, one end of the raman probe 20 is connected to the coupler, and the first optical fiber 60 and the second optical fiber 70 are respectively connected to the coupler, so that laser emitted by the laser generator 30 may sequentially pass through the first optical fiber 60, the coupler and the raman probe 20 and be output to the inside of the cell 11, and raman light may sequentially pass through the raman probe 20, the coupler and the second optical fiber 70 and be input to the raman spectrometer 40. Wherein, the coupler can be directly arranged at one end of the raman probe 20 for connecting with the laser generator 30 and the raman spectrometer 40; of course, the raman probe 20 may also be connected to a third optical fiber 80, at least a portion of the third optical fiber 80 being located outside the battery cell 11, and a coupler being provided at an end of the third optical fiber 80 remote from the raman probe 20, so as to facilitate the coupling of the first optical fiber 60 and the second optical fiber 70 to the raman probe 20. In addition, the raman probe 20 may be directly connected to the laser generator 30 and the raman spectrometer 40 without providing the first, second, and third

optical fibers

60, 70, and 80.

By adopting the technical scheme, the battery system 100 provided by the embodiment of the application, in operation, the laser emitted by the laser generator 30 passes through the raman probe 20 and then is output to the inside of the single battery 11, then the raman light is formed by scattering the internal substances of the single battery 11, the raman light is input into the raman spectrometer 40 through the raman probe 20, the raman spectrometer 40 processes and analyzes the raman light to obtain the change of the microstructure of the internal substances of the single battery 11, so that the change of the microstructure of the internal substances of the battery 10 can be monitored in real time, and the charging and discharging conditions of the battery 10 can be monitored in real time, so that the battery 10 can be maintained in time when the charging and discharging of the battery 10 are abnormal, and the technical problem that the charging and discharging conditions of the single battery 11 cannot be monitored in real time at present is solved.

Optionally, after at least a portion of the raman probe 20 extends into the interior of the battery cell 11, the package member 111 of the battery cell 11 may package the raman probe 20 or the third optical fiber 80, so as to reduce a gap between the raman probe 20 and the package member 111 or between the third optical fiber 80 and the package member 111, and prevent the battery cell 11 from leaking. For example, as shown in fig. 3, the entire raman probe 20 is located inside the battery cell 11, and when the battery cell 11 is a pouch battery 10 and the package 111 is sealed, a gap between the third optical fiber 80 and the package 111 can be filled with a glue for sealing, so as to seal.

Optionally, as shown in fig. 3, the battery system 100 further includes a computer 50, and the computer 50 is electrically connected to the raman spectrometer 40, so that data obtained by analyzing and processing the raman spectrometer 40 can be simulated by the computer 50, which is convenient for a user to monitor the change of the microstructure of the internal substance of the battery cell 11 in real time, so as to detect the charging and discharging conditions of the battery cell 11 in real time.

In some embodiments, referring to fig. 3-5, the raman probe 20 includes an output fiber 21, an input fiber 22, and a first protective sheath 23. The output fiber 21 is connected to the laser generator 30 and the input fiber 22 is connected to the raman spectrometer 40. The first protective sheath 23 covers at least the portion of the output optical fiber 21 inside the battery cell 11 and the portion of the input optical fiber 22 inside the battery cell 11, and the first protective sheath 23 has electrolyte corrosion resistance.

The output optical fiber 21 and the input optical fiber 22 are in the form of cables.

It is understood that at least a portion of the output optical fiber 21 is located inside the battery cell 11, and specifically, the output optical fiber 21 is entirely located inside the battery cell 11, or an end of the output optical fiber 21 away from the laser generator 30 is located inside the battery cell 11 and another portion of the output optical fiber 21 is located outside the battery cell 11. At least a portion of the input optical fiber 22 is located inside the battery cell 11, specifically, the input optical fiber 22 is entirely located inside the battery cell 11, or an end of the input optical fiber 22 away from the raman spectrometer 40 is located inside the battery cell 11, and another portion of the input optical fiber 22 is located outside the battery cell 11. In this way, at least a part of the output fiber 21 and at least a part of the input fiber 22 are both located inside the battery cell 11, and in operation, the laser emitted by the laser generator 30 can irradiate the internal material of the battery cell 11 through the output fiber 21, and after the laser is scattered by the internal material of the battery cell 11 to form raman light, the raman light can be input into the raman spectrometer 40 through the input fiber 22.

Wherein, when the raman probe 20 is directly connected with the laser generator 30 and the raman spectrometer 40, the output optical fiber 21 is directly connected with the laser generator 30, and the input optical fiber 22 is directly connected with the raman spectrometer 40. When the raman probe 20 is connected to the laser generator 30 and the raman spectrometer 40 through the first optical fiber 60 and the second optical fiber 70, respectively, the output optical fiber 21 and the input optical fiber 22 are connected to the above-described coupler for coupling the first optical fiber 60 and the second optical fiber 70. When the raman probe 20 is further connected to the laser generator 30 and the raman spectrometer 40 through the third optical fiber 80, the output optical fiber 21 and the input optical fiber 22 are fused to the third optical fiber 80, and the end of the third optical fiber 80 away from the raman probe 20 is connected to the coupler.

As shown in fig. 4 and 5, the first protective sheath 23 covers only the portion of the output optical fiber 21 extending into the battery cell 11 and the portion of the input optical fiber 22 extending into the battery cell 11; the first protective sheath 23 may cover a portion of the output optical fiber 21 extending into the battery cell 11 and a portion of the output optical fiber extending outside the battery cell 11, and of course, the first protective sheath 23 may cover a portion of the input optical fiber 22 extending into the battery cell 11 and a portion of the input optical fiber extending outside the battery cell 11.

The first protective sheath 23 covers at least a portion of the output optical fiber 21 located inside the battery cell 11 and a portion of the input optical fiber 22 located inside the battery cell 11, and is used for protecting the output optical fiber 21 and the input optical fiber 22, specifically, the first protective sheath 23 covers an outer side surface of the output optical fiber 21 and the input optical fiber 22 as a whole, but does not completely cover an output end surface of the output optical fiber 21 and an input end surface of the input optical fiber 22, and the output optical fiber 21 and the input optical fiber 22 need to be capable of performing laser output operation and the input optical fiber 22 needs to be capable of performing raman light input operation.

First protective sheath 23 has an electrolyte corrosion resistance, meaning that first protective sheath 23 is not corroded by the electrolyte, that is, first protective sheath 23 can maintain its original state when it contacts the electrolyte. The first protective sheath 23 may be made of a material resistant to corrosion by an electrolyte, such as polytetrafluoroethylene, epoxy resin, polyamide, and butylene terephthalate.

By adopting the above technical solution, on one hand, at least the parts of the output optical fiber 21 and the input optical fiber 22 inside the battery cell 11 can be coated and bound by the first protective sheath 23, so that the raman probe 20 composed of the output optical fiber 21 and the input optical fiber 22 can be used as an integral structure, which is convenient for the raman probe 20 to use. On the other hand, the first protective sheath 23 can protect the portions of the output optical fiber 21 and the input optical fiber 22 inside the battery cell 11, and prevent the electrolyte from corroding the output optical fiber 21 and the input optical fiber 22, so that the normal operation of the output of the laser and the input of the raman light can be maintained.

In some embodiments, referring to fig. 4 and 5, the number of the input fibers 22 is set to be plural, and the plural input fibers 22 are arranged around the outer circumference of the output fiber 21.

As shown in fig. 4, the plurality of input fibers 22 are circumferentially distributed centering on the output fiber 21, and the plurality of input fibers 22 are arranged around the output fiber 21.

It can be understood that, after the laser is irradiated to the internal substance of the battery cell 11 through the output optical fiber 21, the laser is scattered all around, the raman light formed by scattering is distributed on the periphery of the output optical fiber 21, and the plurality of input optical fibers 22 are arranged around the periphery of the output optical fiber 21, so that the raman light formed by scattering can be better scattered into the input optical fibers 22 to be input into the raman spectrometer 40 through the input optical fibers 22, thereby improving the utilization rate of the laser and improving the accuracy of the component change of the internal substance of the battery cell 11 analyzed and processed by the raman spectrometer 40.

In some embodiments, referring to fig. 4 and 5, the raman probe 20 further includes a second protection sheath 24, and the second protection sheath 24 is disposed in the first protection sheath 23 and covers at least a portion of the output optical fiber 21 inside the battery cell 11.

The second protective sheath 24 covers the portion of the output optical fiber 21 inside the battery cell 11, or the second protective sheath 24 covers both the portion of the output optical fiber 21 inside the battery cell 11 and the portion of the output optical fiber 21 outside the battery cell 11.

As shown in FIG. 4, the second protective sheath 24 is in the form of a sleeve, the second protective sheath 24 having a wall thickness. The second protective sheath 24 is wrapped around the output optical fiber 21, which means that the second protective sheath 24 is wrapped around the outer periphery of the output optical fiber 21. Wherein the second protective sheath 24 is positioned between the output optical fiber 21 and the input optical fiber 22 such that the output optical fiber 21 and the input optical fiber 22 have a separation distance therebetween that is greater than or equal to a wall thickness of the second protective sheath 24.

By adopting the above technical solution, the output optical fiber 21 and the input optical fiber 22 are separated by a certain distance through the second protective sheath 24, so that the raman light formed by scattering can be better scattered to the input optical fiber 22 and input to the raman spectrometer 40 through the input optical fiber 22.

Alternatively, the second protective sheath 24 may be made of a material resistant to corrosion by the electrolyte, such as teflon, epoxy resin, polyamide, and butylene terephthalate, so that the second protective sheath 24 also has a property resistant to corrosion by the electrolyte, and can prevent the output optical fiber 21 from being corroded by the electrolyte as much as possible.

In some embodiments, referring to fig. 4 and 5, the wall thickness of the first protective sheath 23 is 80 to 500 μm, or the wall thickness of the second protective sheath 24 is 80 to 500 μm, or both the wall thicknesses of the first protective sheath 23 and the second protective sheath 24 are 80 to 500 μm.

The wall thickness of the first sheath 23 is as shown by the dimension L1 in FIGS. 4 and 5, and L1 may be 100 μm, 200 μm, 300 μm, 400 μm, or the like, as long as it can be in the range of 80 to 500. Mu.m.

The wall thickness of the second protective sheath 24 is as indicated by dimension L2 in FIGS. 4 and 5, and L2 may be selected from 100 μm, 200 μm, 300 μm, 400 μm, etc., as long as it can be in the range of 80 to 500 μm.

By adopting the above technical scheme, the wall thickness range of the first protection sleeve 23 is limited, the wall thickness of the first protection sleeve 23 is not too small, the protection of the output optical fiber 21 and the input optical fiber 22 can be effectively realized, the electrolyte is prevented from permeating into the output optical fiber 21 and the input optical fiber 22 as much as possible, meanwhile, the wall thickness of the first protection sleeve 23 is also not too large, the outer diameter of the whole raman probe 20 is prevented from being too large on the basis of realizing the protection of the output optical fiber 21 and the input optical fiber 22, and the problem that the battery cell 11 is difficult to package due to the fact that the outer diameter of the raman probe 20 is too large is further avoided. The wall thickness of the second protective sheath 24 is limited to provide a range of distances between the output fiber 21 and the input fiber 22 that facilitate scattering of the raman light into the input fiber 22 for input into the raman spectrometer 40 through the input fiber 22 to minimize the amount of energy incident on the output fiber 21.

Optionally, the wall thickness of the first protective sheath 23 ranges from 100 to 200 μm, or the wall thickness of the second protective sheath 24 ranges from 100 to 200 μm, or both the wall thicknesses of the first protective sheath 23 and the second protective sheath 24 range from 100 to 200 μm.

In some embodiments, referring to fig. 5, the raman probe 20 further comprises a filter 25, the filter 25 is connected to the first protective sheath 23 and covers an end of the output fiber 21 away from the laser generator 30 and an end of the input fiber 22 away from the raman spectrometer 40.

The filter 25 has a sheet structure, and the filter 25 can pass part of light and filter part of light. In this embodiment, the optical filter 25 can allow the laser and the raman light to pass through, and can filter out the background light, for example, filter out other stray light except the laser when the laser is output, and can filter out non-raman light when the raman light is input. The filter 25 may be made of calcium fluoride, silicon dioxide, silicon nitride, glass, quartz, or the like.

It is understood that the optical filter 25 is located at an end of the output optical fiber 21 away from the laser generator 30 and an end of the input optical fiber 22 away from the raman spectrometer 40, and the optical filter 25 is connected to the first protective sheath 23 and faces and covers the output end face of the output optical fiber 21 and the input end face of the input optical fiber 22.

By adopting the above technical scheme, after the laser generated by the laser generator 30 passes through the output optical fiber 21, the laser needs to pass through the optical filter 25 and irradiate the internal substance of the battery cell 11, the raman light formed by laser scattering needs to pass through the input optical fiber 22 after passing through the filtering effect of the optical filter 25 so as to be input into the raman spectrometer 40, and thus, the optical filter 25 can effectively filter the non-raman light in the battery cell 11, and further avoid the non-raman light from being input into the raman spectrometer 40 through the input optical fiber 22, which is helpful for improving the accuracy of the analysis and processing of the raman spectrometer 40 on the component change of the internal substance of the battery cell 11.

Optionally, the optical filter 25 has an electrolyte corrosion resistance, so that the optical filter 25 and the first protective sheath 23 can protect at least the input optical fiber 22 and the portion of the output optical fiber 21 inside the battery cell 11, thereby protecting at least the output optical fiber 21 and the portion of the input optical fiber 22 inside the battery cell 11 from corrosion of the output optical fiber 21 and the input optical fiber 22 by the electrolyte.

In some embodiments, referring to FIG. 5, the thickness of the filter 25 is in the range of 100 to 1000 μm.

The thickness of the filter 25 refers to a dimension of the filter 25 in a direction just opposite to the output optical fiber 21 and the input optical fiber 22, that is, a dimension in an axial direction of the output optical fiber 21 and the input optical fiber 22. Specifically, as shown by the dimension L3 in FIG. 5, L3 may be 200. Mu.m, 300. Mu.m, 400. Mu.m, 500. Mu.m, 600. Mu.m, or the like, and may be in the range of 100 to 1000. Mu.m.

By adopting the above technical scheme, the thickness of the optical filter 25 is not too large, the problem of poor light signal output effect caused by the excessively thick optical filter 25 is avoided, the thickness of the optical filter 25 is not too small, and the filtering of the background light by the optical filter 25 is facilitated.

Alternatively, the thickness of the filter 25 is in a range of 200 to 500 μm. The thickness of the filter 25 may be 300 μm, 350 μm, 400 μm, 450 μm, or the like, and may be in the range of 200 to 500. Mu.m.

In some embodiments, referring to fig. 4 and 5, the raman probe 20 is in a column shape, and it can also be understood that the raman probe 20 is in a line shape, and the diameter of the raman probe 20 ranges from 600 to 1200 μm.

The diameter of the Raman probe 20 is as shown by the dimension L4 in FIG. 5, and L4 may be 700 μm, 800 μm, 900 μm, 1000 μm, 1100 μm, or the like, as long as it is in the range of 600 to 1200 μm.

By adopting the above technical scheme, the raman probe 20 has a larger diameter, so that the raman probe 20 can accommodate a sufficient number of input optical fibers 22 and output optical fibers 21, which is beneficial to the output of laser and the input work of raman light, and the diameter of the raman probe 20 is not too large, which is convenient for the raman probe 20 to be packaged in the battery cell 11, and reduces the leakage risk of the battery cell 11.

Alternatively, the diameter of the Raman probe 20 is in a range of 800 to 900 μm.

In some embodiments, the number of the battery cells 11 is multiple, the raman probes 20 are disposed inside the plurality of battery cells 11, and each raman probe 20 is connected to the laser generator 30 and the raman spectrometer 40.

It is understood that the laser generator 30 is connected to a plurality of raman probes 20, the plurality of raman probes 20 are respectively extended into the plurality of cells 11, and each raman probe 20 is further connected to the raman spectrometer 40.

Wherein, a plurality of battery cells 11 can be connected in series, in parallel or in series-parallel to form a whole to be put into the case 12, thereby forming the battery 10. Or, the plurality of battery cells 11 are connected in series, in parallel, or in series-parallel to form a plurality of portions, and each portion forms a battery module by structures such as end plates, side plates, and the like, that is, the plurality of battery cells 11 form a plurality of battery modules, and the plurality of battery modules are connected in series, in parallel, or in series-parallel to form the battery 10.

Through adopting above-mentioned technical scheme, can be with laser emission to a plurality of raman probe 20 through a laser generator 30 to respectively with laser irradiation to a plurality of battery monomer 11 inside, laser forms raman light at the inside scattering of battery monomer 11, and input to raman spectrometer 40 through raman probe 20 that corresponds, so that a raman spectrometer 40 can carry out real-time supervision to the micro-structure change of the inside material of a plurality of battery monomer 11 simultaneously, thereby carry out real-time supervision to the charge-discharge condition of a plurality of battery monomer 11.

In some embodiments, referring to fig. 3, the battery cell 11 includes a package member 111, an electrode assembly 112, and an electrolyte, and the electrode assembly 112 and the electrolyte are packaged in the package member 111. The end face of the raman probe 20 is facing the electrode assembly 112, or the end of the raman probe 20 is immersed in the electrolyte, or the end face of the raman probe 20 is immersed in the electrolyte and facing the electrode assembly 112.

The end face of the raman probe 20 facing the electrode assembly 112 means that the end face of the raman probe 20 remote from the laser generator 30 and the raman spectrometer 40 is facing the electrode assembly 112. Specifically, the end face of the raman probe 20 may be directed to the surface of the outer peripheral side of the electrode assembly 112, which may be the surface of the positive electrode tab or the negative electrode tab; the Raman probe 20 can also extend between the positive pole piece and the negative pole piece and is just opposite to the surface of the positive pole piece or the negative pole piece; even when the positive electrode tab and the negative electrode tab of the electrode assembly 112 are stacked, the end face of the raman probe 20 may be directed to one end in the direction perpendicular to the stacking direction of the positive electrode tab and the negative electrode tab, and when the positive electrode tab and the negative electrode tab of the electrode assembly 112 are wound, the end face of the raman probe 20 may be directed to one end in the direction in which the central axes of the positive electrode tab and the negative electrode tab are located, and at this time, the end face of the raman probe 20 may be directed to the separator of the electrode assembly 112 at the same time. Thus, when the laser generator 30 emits laser light, the laser light irradiates the electrode assembly 112 through the raman probe 20, and after the raman light formed by scattering of the electrode assembly 112 is input into the raman spectrometer 40 through the raman probe 20, the raman spectrometer 40 may analyze and process the raman light to obtain changes in material composition and form of the electrode assembly 112, for example, changes in tensile vibration frequency of a phosphorus-oxygen bond of the positive electrode plate, so as to obtain charging and discharging conditions of the battery cell 11.

At least a portion of the raman probe 20 is immersed in the electrolyte, meaning that the raman probe 20 is entirely immersed in the electrolyte, as shown in fig. 3, or alternatively, an end of the raman probe 20 remote from the laser generator 30 and the raman spectrometer 40 is immersed in the electrolyte. Specifically, at least a part of the raman probe 20 may extend between the positive electrode plate and the negative electrode plate of the electrode assembly 112, and since the positive electrode plate and the negative electrode plate are immersed in the electrolyte, at least a part of the raman probe 20 may be immersed in the electrolyte; at least part of the raman probe 20 may also be located on a surface of the outer circumference side of the electrode assembly 112, in which case at least part of the raman probe 20 may be immersed in the electrolyte; in addition, when the positive electrode piece and the negative electrode piece of the electrode assembly 112 are stacked, at least a part of the raman probe 20 may be located at one end in a direction perpendicular to the stacking direction of the positive electrode piece and the negative electrode piece, and when the positive electrode piece and the negative electrode piece of the electrode assembly 112 are wound, at least a part of the raman probe 20 may also be located at one end in a direction in which central axes of the positive electrode piece and the negative electrode piece are located, so that at least a part of the raman probe 20 may also be immersed in the electrolyte; even when the positive electrode tab and the negative electrode tab of the electrode assembly 112 are wound, at least a portion of the raman probe 20 may protrude into the center of the electrode assembly 112. Thus, when the laser generator 30 emits laser light, the laser light is irradiated to the electrolyte through the raman probe 20, and after the raman light formed by scattering of the electrolyte is input to the raman spectrometer 40 through the raman probe 20, the raman spectrometer 40 may analyze and process the raman light to obtain changes in material composition and form of the electrolyte, for example, changes in tensile vibration frequency of a carbon-oxygen bond of the electrolyte, so as to obtain charging and discharging conditions of the battery cell 11.

By adopting the above technical scheme, the raman probe 20 can irradiate laser towards the electrode assembly 112 and/or the electrolyte, so that the charging and discharging conditions of the battery cell 11 can be obtained through the obtained changes of the component materials and the forms of the electrode assembly 112 and/or the electrolyte, and the real-time monitoring work of the battery cell 11 is realized.

Of course, in other embodiments, the raman probe 20 may also be used to irradiate a laser on a diaphragm or other component to enable real-time detection of the material composition of the diaphragm or other component.

In some embodiments, a plurality of raman probes 20 may be disposed inside one battery cell 11, wherein an end face of at least one raman probe 20 is opposite to a pole piece (which may be a positive pole piece and/or a negative pole piece) of the electrode assembly 112, and at least a portion of at least one raman probe 20 is immersed in the electrolyte.

The specific situation that the end face of the raman probe 20 is facing the pole piece of the electrode assembly 112, and the specific situation that at least a part of the raman probe 20 is immersed in the electrolyte can refer to the description in the above embodiments, and repeated description is not repeated here.

It is understood that the plurality of raman probes 20 in one cell 11 are connected to the laser generator 30 and the raman spectrometer 40, respectively, such that the laser generated by the laser generator 30 can be irradiated to the inside of the cell 11 through the plurality of raman probes 20. Specifically, a part of laser is irradiated to the pole piece of the electrode assembly 112 through at least one raman probe 20, and is scattered in the electrode assembly 112 to form raman light, and the raman light is input into the raman spectrometer 40 through the corresponding raman probe 20, so that the raman light is analyzed and processed by the raman spectrometer 40 to obtain the change of the material composition and the form of the pole piece of the electrode assembly 112, and thus the charging and discharging capacity of the battery cell 11 is obtained; the other part of the laser is irradiated into the electrolyte through at least one raman probe 20 and is scattered in the electrolyte to form raman light, and the raman light is input into the raman spectrometer 40 through the corresponding raman probe 20, so that the raman light is analyzed and processed by the raman spectrometer 40 to obtain the change of the material composition and the form of the pole piece of the electrolyte, and the charging and discharging capacity of the battery cell 11 is obtained.

By adopting the above technical scheme, the laser emitted by the laser generator 30 can irradiate the electrode assembly 112 and the electrolyte inside the battery cell 11 through the plurality of raman probes 20, and the formed raman light is input to the raman spectrometer 40, and then the change of the material composition of the electrode assembly 112 and the change of the material composition of the electrolyte can be obtained through analysis and processing, so that the charging and discharging condition of the battery cell 11 can be obtained through the change of the material composition and the form of the electrode assembly 112 and the electrolyte, and the accuracy of the obtained charging and discharging condition of the battery cell 11 can be improved.

The second aspect of the embodiment of the present application provides an electric device, which includes a device body and a battery system 100, wherein the battery cell 11, the laser generator 30 and the raman spectrometer 40 of the battery system 100 are all disposed on the device body, and the battery cell 11 of the battery system 100 is electrically connected to the device body and is used for supplying power to the device body. The battery system 100 provided in this embodiment is the same as the battery system 100 provided in the first aspect, and reference may be specifically made to the battery system 100 provided in the first aspect, which is not repeated herein. Similarly, the types of the electric devices can also refer to the relevant parts of the above embodiments, and are not described again here.

When the electric device is a vehicle 1000, as shown in fig. 1, the device body of the electric device includes the controller 200 and the motor 300.

By adopting the technical scheme, the Raman probe 20 is arranged in the single battery 11, and the Raman probe 20 is respectively connected with the laser generator 30 and the Raman spectrometer 40, so that the microstructure of the internal substances of the single battery 11 can be monitored in real time, and the charging and discharging conditions of the single battery 11 can be monitored in real time.

A third aspect of the embodiments of the present application provides an energy storage system, which includes a cabinet and a battery system 100, where the battery system 100 is disposed in the cabinet. The battery system 100 provided in this embodiment is the same as the battery system 100 provided in the first aspect, and reference may be specifically made to the battery system 100 provided in the first aspect, which is not repeated herein. Similarly, the type of the energy storage system can also refer to the relevant parts of the above embodiments, and will not be described again.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. A battery system, comprising:

a battery cell;

the Raman probe is at least partially arranged inside the battery cell;

the laser generator is connected to the Raman probe and is used for outputting laser; the Raman probe is used for outputting the laser to the interior of the battery cell;

and the Raman spectrometer is connected with the Raman probe and is used for receiving Raman light which is input by the Raman probe and is formed by the laser after scattering.

2. The battery system of claim 1, wherein the Raman probe comprises:

an output optical fiber connected to the laser generator;

the input optical fiber is connected with the Raman spectrometer;

the first protection sleeve at least wraps the part of the output optical fiber, which is positioned in the battery cell, and the part of the input optical fiber, which is positioned in the battery cell, and has electrolyte corrosion resistance.

3. The battery system according to claim 2, wherein the input optical fiber is provided in plural number, and the plural input optical fibers are arranged around an outer periphery of the output optical fiber.

4. The battery system of claim 2, wherein the raman probe further comprises a second protective sheath disposed within the first protective sheath and covering at least a portion of the output optical fiber within the cell.

5. The battery system of claim 4, wherein the wall thickness of the first protective sheath and/or the second protective sheath ranges from 80 to 500 μm.

6. The battery system of claim 2, wherein the raman probe further comprises a filter coupled to the first protective sheath and covering an end of the output fiber remote from the laser generator and an end of the input fiber remote from the raman spectrometer.

7. The battery system according to claim 6, wherein the thickness of the optical filter is in a range of 100 to 1000 μm.

8. The battery system according to any one of claims 1 to 7, wherein the Raman probe has a columnar shape, and the diameter of the Raman probe is in a range of 600 to 1200 μm.

9. The battery system according to any one of claims 1 to 7, wherein the number of the battery cells is plural, the Raman probe is disposed inside each of the plural battery cells, and each of the Raman probes is connected to the laser generator and the Raman spectrometer.

10. The battery system of any of claims 1-7, wherein the battery cell comprises a package, an electrode assembly disposed within the package, and an electrolyte disposed within the package; the end face of the raman probe is facing the electrode assembly, and/or at least a portion of the raman probe is immersed in the electrolyte.

11. The battery system of claim 10, wherein a plurality of the raman probes are disposed inside the battery cell, at least one end surface of the raman probe faces the pole piece of the electrode assembly, and at least a portion of at least one of the raman probes is immersed in the electrolyte.

12. An electric device, comprising a device body and a battery system according to any one of claims 1 to 11, wherein a battery cell of the battery system is electrically connected to the device body and is used for supplying power to the device body.

13. An energy storage system, comprising a cabinet and a battery system as claimed in any one of claims 1 to 11, the battery system being disposed in the cabinet.