CN220510090U - Energy storage device - Google Patents

Abstract

The utility model discloses energy storage equipment. The energy storage device includes: each battery cluster comprises a plurality of battery modules, each battery module comprises a plurality of battery cells, and the battery cells are electrically connected with each other through a plurality of electric connecting sheets; the optical fiber temperature measuring system comprises a temperature measuring host, an optical fiber splice box, a beam splitting box and optical fiber temperature sensing pieces, wherein the optical fiber temperature sensing pieces are arranged on each measured object, and the measured objects comprise electric connecting pieces and/or battery monomers; each battery cluster is provided with at least one light splitting box which is connected with an optical fiber temperature sensing piece; the optical fiber splice box is connected with the light splitting boxes on all the battery clusters; the temperature measuring host is connected with the optical fiber splice box, and is used for transmitting detection light to enter the optical fiber temperature sensing piece through the optical fiber splice box and the light splitting box, receiving optical signals of the optical fiber temperature sensing piece which are returned through the light splitting box and the optical fiber splice box in sequence, and processing the optical signals to obtain the temperature of a measured object. The energy storage device can reduce the temperature measurement cost.

Description

Energy storage device

Technical Field

The utility model relates to the technical field of energy storage, in particular to energy storage equipment.

Background

In the related art, the energy storage system generally uses a thermocouple to be installed on the direct current main loop to collect the temperature of the current core, for example, the thermocouple for collecting the temperature of the current core is installed on a bar, and the thermocouple for collecting the temperature of the high-voltage box is installed on the total positive total negative copper bar.

However, the thermocouple is used for temperature acquisition, and only the temperature of the installation position of the thermocouple can be acquired, so that the temperature is acquired for point type temperature, and the thermocouple cannot be arranged too much from the aspect of product cost, so that the initial starting point of the thermal runaway cannot be detected possibly until the thermal runaway spreads to the battery core with the temperature acquisition point, the best opportunity is missed, and the early warning of the thermal runaway position cannot be performed in advance.

Disclosure of Invention

The embodiment of the utility model provides energy storage equipment to solve at least one technical problem.

An energy storage device of an embodiment of the present utility model includes:

each battery cluster comprises a plurality of battery modules, each battery module comprises a plurality of battery cells, and the battery cells are electrically connected with each other through a plurality of electric connecting sheets;

the optical fiber temperature measurement system comprises a temperature measurement host, an optical fiber splice box, a light splitting box and optical fiber temperature sensing pieces, wherein the optical fiber temperature sensing pieces are arranged on each measured object, and the measured objects comprise the electric connection pieces and/or the battery monomers;

at least one light splitting box is arranged on each battery cluster and connected with the optical fiber temperature sensing piece;

the optical fiber splice boxes are connected with all the light splitting boxes on the battery clusters;

the temperature measuring host is connected with the optical fiber splice box, and is used for transmitting detection light to enter the optical fiber temperature sensing piece through the optical fiber splice box and the light splitting box in sequence, receiving optical signals of the optical fiber temperature sensing piece returned through the light splitting box and the optical fiber splice box in sequence, and processing the optical signals to obtain the temperature of the measured object.

In the energy storage equipment, the optical fiber temperature measuring system acquires the temperature of the measured objects by receiving the returned optical signals of the optical fiber temperature sensing pieces, so that the temperature of each measured object can be measured, compared with the case that a thermocouple is arranged on each measured object, the cost can be reduced, and when the temperature of the measured object is abnormal, the abnormal temperature point can be rapidly positioned through the position of the optical fiber temperature sensing piece.

In some embodiments, the optical fiber temperature sensing element comprises a temperature sensing optical fiber, the plurality of electric connection sheets are electrically connected with the plurality of battery cells and form a loop, and the temperature sensing optical fiber is arranged on the plurality of electric connection sheets along the loop.

Therefore, the temperature sensing optical fiber can be utilized to continuously measure the temperature along a loop formed by electrically connecting a plurality of battery cells along a plurality of electric connection sheets, and the distributed temperature measurement is realized.

In some embodiments, the fiber optic temperature sensing element includes a plurality of fiber optic gratings, each of the fiber optic gratings being disposed on a corresponding one of the objects under test.

Thus, the temperature of the object to be measured can be detected by the fiber grating.

In some embodiments, the optical fiber temperature sensing element comprises a plurality of temperature sensing optical fibers, and the tail end of each temperature sensing optical fiber is arranged on a corresponding measured object.

Thus, the temperature of the object to be measured can be detected by using a plurality of temperature sensing optical fibers, and the temperature is measured in a point type.

In some embodiments, the energy storage device includes an upper computer, where the upper computer is in communication connection with the temperature measurement host and the server, and the upper computer is configured to obtain the temperature of the measured object, and send the temperature of the measured object to the server so that the server displays the temperature of the measured object.

Therefore, a user can monitor the energy storage device at the server side conveniently.

In certain embodiments, the energy storage device comprises a central control convergence cabinet, and the optical fiber splice box, the temperature measuring host and the upper computer are installed in the central control convergence cabinet.

Therefore, the optical fiber splice box, the temperature measuring host and the upper computer can be protected without adding additional protection components.

In some embodiments, the energy storage device includes an alarm system, where the alarm system is in communication connection with the temperature measurement host, and the alarm system is configured to obtain a temperature of the measured object, and send alarm information when the temperature of the measured object is greater than a preset temperature.

In this way, an alarm can be given locally at the energy storage device.

In some embodiments, the energy storage device includes a fire protection system, the fire protection system is in communication connection with the temperature measurement host, the fire protection system includes a plurality of fire protection nozzles, each fire protection nozzle is set corresponding to at least one battery module, the fire protection system is used for obtaining the temperature of the measured object, and under the condition that the temperature of the measured object is greater than a preset temperature, the fire protection operation is performed by the fire protection nozzle corresponding to the battery module for controlling the temperature of the measured object to be greater than the preset temperature.

Thus, the safety of the energy storage device can be improved.

In certain embodiments, the battery cell includes an explosion-proof valve, and the fiber optic temperature sensing element is spaced above the explosion-proof valve.

Therefore, the optical fiber temperature measurement system can detect whether the explosion-proof valve erupts or not, and the safety of the energy storage equipment is improved.

In certain embodiments, the battery cluster includes a high voltage cassette within which the light splitting cassette is mounted.

Thus, the light splitting box can be protected without adding an additional protecting component.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained from the structures shown in these drawings without the need for inventive effort to a person skilled in the art.

FIG. 1 is a block diagram of an energy storage device according to an embodiment of the present utility model;

FIG. 2 is a block diagram of a battery cluster according to an embodiment of the present utility model;

fig. 3 is a structural view of a battery module according to an embodiment of the present utility model;

fig. 4 to 5 are partial structure views of a battery module according to an embodiment of the present utility model.

Reference numerals illustrate:

the system comprises energy storage equipment 100, a battery cluster 12, an optical fiber temperature measuring system 14, a battery module 16, a battery cell 18, an electric connection sheet 20, a temperature measuring host 22, an optical fiber splice box 24, a light splitting box 26, an optical fiber temperature sensing piece 28, a container 30, a total positive electrode 31, a high-voltage box 32, a total negative electrode 33, an upper computer 34, an alarm system 36, a fire protection system 38, an explosion-proof valve 40, a loop 41, a temperature sensing optical fiber 42, an optical fiber access point 43, an optical fiber grating 44 and a server 200.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present utility model and are not to be construed as limiting the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. Either mechanically or electrically. 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 present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.

Referring to fig. 1 to 3, an energy storage device 100 according to an embodiment of the present utility model includes a plurality of battery clusters 12 and an optical fiber temperature measurement system 14. Each battery cluster 12 includes a plurality of battery modules 16, each battery module 16 includes a plurality of battery cells 18, and the plurality of battery cells 18 are electrically connected to each other by a plurality of electrical connection tabs 20.

The optical fiber temperature measuring system 14 comprises a temperature measuring host 22, an optical fiber splice box 24, a beam splitting box 26 and an optical fiber temperature sensing piece 28, wherein the optical fiber temperature sensing piece 28 is arranged on each measured object, and the measured objects comprise an electric connecting sheet 20 and/or a battery cell 18. Each battery cluster 12 is provided with a light splitting box 26, and the light splitting boxes 26 are connected with optical fiber temperature sensing elements 28. The fiber optic closure 24 connects the splice cassettes 26 on all of the battery clusters 12. The temperature measuring host 22 is connected with the optical fiber splice box 24, the temperature measuring host 22 is used for transmitting detection light to enter the optical fiber temperature sensing piece 28 through the optical fiber splice box 24 and the light splitting box 26 in sequence, receiving optical signals of the optical fiber temperature sensing piece 28 which are returned through the light splitting box 26 and the optical fiber splice box 24 in sequence, and processing the optical signals to obtain the temperature of a measured object.

In the above energy storage device 100, the optical fiber temperature measurement system 14 obtains the temperature of the measured objects through the optical signal returned by the optical fiber temperature sensing element 28, so as to measure the temperature of each measured object, which can reduce the cost compared with the case that a thermocouple is installed on each measured object, and can rapidly locate the abnormal temperature point through the position of the optical fiber temperature sensing element 28 when the temperature of the measured object is abnormal.

Further, when the optical fiber temperature sensing member 28 detects the temperature of the battery cell 18, the battery management module (BMS, battery Management System) of the battery module 16 can omit the temperature collection point of the battery management unit board (BMU, battery Management Unit), thereby reducing the BMS cost.

In particular, the energy storage device 100 may include a container 30, and the plurality of battery clusters 12 and the fiber optic thermometry system 14 may be disposed within the container 30. Each battery cluster 12 may also include a cluster frame on which a plurality of battery modules 16 are mounted, for example, a plurality of battery modules 16 are mounted in a row-column arrangement. The plurality of battery modules 16 are electrically connected in series, parallel, or series-parallel to form a battery system having a total positive electrode 31 and a total negative electrode 33.

Each cluster frame is also provided with a high-voltage box 32, the high-voltage box 32 is connected with a total positive electrode 31 and a total negative electrode 33 of the battery system, and the high-voltage box 32 can collect information of the battery cells 18, including but not limited to information of voltage, electric quantity and the like of the battery cells 18. The high voltage box 32 may be connected to an external device to control the battery cluster 12 to discharge or charge the outside.

The battery module 16 may include a housing in which a plurality of battery cells 18 are located, and the plurality of battery cells 18 may be electrically connected in series, parallel, or both by a plurality of electrical connection tabs 20. In fig. 3, a plurality of battery cells 18 are connected in series by a plurality of electrical connection tabs 20. The electrical connection pads 20 may be aluminum tabs.

The optical fiber temperature sensing elements 28 are arranged on each object to be measured, the temperature of the object to be measured can influence the detection light of the optical fiber temperature sensing elements 28, and the temperature measuring host 22 can obtain the temperature of the object to be measured according to the returned optical signals of the optical fiber temperature sensing elements 28. The specific principle of temperature detection using the optical fiber may be referred to the following description, and will not be described in detail herein.

In one embodiment, the object to be measured includes the electric connection piece 20 and the battery cells 18, and the optical fiber temperature sensing piece 28 is disposed on each electric connection piece 20 and each battery cell 18, so that the temperature of each electric connection piece 20 and each battery cell 18 can be measured separately. In one embodiment, the object to be measured includes electrical connection pads 20, and a fiber optic temperature sensing element 28 is disposed on each electrical connection pad 20 to enable individual temperature measurements of each electrical connection pad 20. In one embodiment, the object to be measured includes battery cells 18, and an optical fiber temperature sensing element 28 is disposed on each battery cell 18, so that each battery cell 18 can be individually measured.

The temperature measurement host 22 may include a light emitter and a light receiver, where the light emitter is configured to emit detection light (e.g., laser light), and referring to fig. 1 to 3, the optical fiber splice box 24 may divide the detection light of one optical path into detection lights of N optical paths, where N is the number of battery clusters 12, and the N detection lights may be respectively transmitted to the light splitting boxes 26 of the N battery clusters 12 through optical fibers.

In one embodiment, one light splitting box 26 is mounted on one battery cluster 12, and one light splitting box 26 can split the detection light of one light path into M detection lights of light paths, where M is the number of battery modules 16. The detection light can reach the optical fiber temperature sensing member 28 on each battery module 16. Thus, the detection light of one optical path can be divided into detection light of m×n optical paths by the optical fiber splicing box 24 and the spectroscopic box 26.

It is to be understood that the number of the light splitting cartridges 26 mounted on the battery cluster 12 is not limited to one, but may be plural (two or more), and may be configured according to the number of light splitting ports of each light splitting cartridge 26 and the number of the battery modules 16, which is not particularly limited herein.

The optical fiber temperature measurement system 14 of the present utility model can realize the temperature measurement from the module level to the cluster level and then to the container 30 level, specifically, in the module level temperature measurement, the temperature distribution of all the objects to be measured of each battery module 16 can be determined by returning the optical signal of the optical fiber temperature sensing element 28, in the cluster level temperature measurement, the temperature distribution of all the battery modules 16 of each battery cluster 12 can be obtained by the temperature data of the module level temperature measurement, and in the container 30 level temperature measurement, the temperature distribution of all the battery clusters 12 can be obtained by the temperature data of the cluster level temperature measurement. Compared with the method of using thermocouples to measure the temperature of each measured object, the optical fiber temperature measuring system 14 measures the temperature of the measured object by using the optical fiber temperature sensing piece 28, so that the cost can be reduced, when the temperature of the measured object is abnormal, the position of the optical fiber temperature sensing piece 28 can rapidly locate the abnormal point of the temperature, and early warning can be performed later.

In some embodiments, the energy storage device 100 includes a host computer 34, where the host computer 34 is communicatively connected to the temperature measurement host 22 and the server 200, and the host computer 34 is configured to obtain the temperature of the measured object and send the temperature of the measured object to the server 200 so that the server 200 displays the temperature of the measured object.

In this way, the user can monitor the energy storage device 100 at the server 200.

Specifically, the server 200 may perform wired or wireless communication connection with the upper computers 34 of the multiple energy storage devices 100, obtain temperatures of the measured objects uploaded by the upper computers 34 of the multiple energy storage devices 100, and the temperatures of the measured objects may be displayed on a display screen of the server 200, where each energy storage device 100 has a device ID, and a user switches the device IDs of the different energy storage devices 100 through an input component (such as a keyboard, a mouse, a touch screen, etc.) of the server 200 to monitor the temperatures of the measured objects of the respective energy storage devices 100. When the temperature of the measured object is abnormal, the server 200 can perform alarm prompt to quickly remind the user of which energy storage device 100 the measured object has abnormal temperature.

The host computer 34 includes, but is not limited to, a personal computer, tablet computer, cell phone, etc. Further, the host computer 34 may also be integrated with an energy management system (EMS, energy Management System). The energy management system can monitor, power control and energy management the energy storage device 100, realize centralized monitoring of a battery management system and an energy storage converter (PCS, power Conversion System) of the energy storage device 100, unify operation, maintenance and overhaul management, realize rapid elimination of faults, relieve power grid pressure at the time of load peaks, reduce power grid operation cost and improve economic benefit.

In certain embodiments, the energy storage device 100 comprises a central control closet within which the fiber optic splice closure 24, the temperature measurement host 22, and the host computer 34 are mounted.

In this way, the optical fiber splice closure 24, the temperature measuring host 22 and the host computer 34 can be protected without adding additional protection components.

Specifically, all of the battery clusters 12 of the energy storage device 100 are electrically connected to a central control bus, which in one embodiment may be a dc bus, which may bus each of the battery clusters 12 in parallel and output.

The optical fiber splice box 24, the temperature measuring host 22 and the upper computer 34 are arranged in the central control convergence cabinet, and the central control convergence cabinet can protect the optical fiber splice box 24, the temperature measuring host 22 and the upper computer 34 without adding additional protection components, so that the cost is reduced.

In some embodiments, the energy storage device 100 includes an alarm system 36, where the alarm system 36 is communicatively connected to the temperature measurement host 22, and the alarm system 36 is configured to obtain a temperature of the measured object, and send out alarm information when the temperature of the measured object is greater than a preset temperature.

In this manner, an alarm may be raised locally on the energy storage device 100.

Specifically, the alarm system 36 may include a warning light and a speaker. The alarm information may include sound information and light information, for example, when the temperature of the measured object is greater than the preset temperature, the alarm system 36 may control the alarm lamp to emit light with a certain color or flash with a certain frequency, and may also control the speaker to play voice with abnormal temperature.

Further, in the present embodiment, the alarm system 36 is further connected to the host computer 34 in a communication manner, and the host computer 34 can obtain the alarm information and upload the alarm information to the server 200, so that the server 200 can alarm. The preset temperature may be specifically defined according to actual requirements, and is not specifically defined herein. When the measured object includes the electric connection sheet 20 and the battery cell 18, the preset temperature includes a first preset temperature and a second preset temperature, when the temperature of the electric connection sheet 20 is greater than the first preset temperature, the alarm system 36 sends out alarm information, and when the temperature of the battery cell 18 is greater than the second preset temperature, the alarm system 36 sends out alarm information. The first preset temperature and the second preset temperature may be the same or different, and are not particularly limited herein. Alternatively, the alarm information due to the abnormal temperature of the electrical connection sheet 20 is different from the alarm information due to the abnormal temperature of the battery cell 18.

In some embodiments, the energy storage device 100 includes a fire protection system 38, the fire protection system 38 is communicatively connected to the temperature measurement host 22, the fire protection system 38 includes a plurality of fire protection nozzles, each fire protection nozzle is disposed corresponding to at least one battery module 16, the fire protection system 38 is configured to obtain a temperature of a measured object, and in a case that the temperature of the measured object is greater than a preset temperature, the fire protection system 38 is configured to control the fire protection nozzle corresponding to the battery module 16 whose temperature of the measured object is greater than the preset temperature to perform a fire protection operation.

In this manner, the safety of the energy storage device 100 may be improved.

Specifically, in one embodiment, each fire-fighting nozzle is disposed corresponding to one battery module 16, specifically, for one battery cluster 12, a×b battery modules 16 are arranged along a row B column, for each column of battery modules 16, a fire-fighting nozzles may be disposed, and each fire-fighting nozzle is disposed beside a corresponding one of the battery modules 16.

In one embodiment, each fire-fighting nozzle may be disposed corresponding to two battery modules 16, specifically, for one battery cluster 12, a×b battery modules 16 are arranged along a row B, and a row a of fire-fighting nozzles may be disposed between two adjacent rows of battery modules 16, and each fire-fighting nozzle is disposed between two adjacent battery modules 16.

It will be appreciated that in other embodiments, the number of the fire fighting nozzles and the battery modules 16 is not limited to the two embodiments, but may be other corresponding relationships, and is not specifically limited herein.

In the case that the temperature of the measured object is greater than the preset temperature, the fire control system 38 may control the fire control nozzle corresponding to the battery module 16 having the temperature of the measured object greater than the preset temperature to perform fire control operations including, but not limited to, spraying gas, liquid, powder, etc. to the battery module 16 having the thermal runaway.

In some embodiments, the battery cell 18 includes an explosion-proof valve 40, and the fiber optic temperature sensing element 28 is spaced above the explosion-proof valve 40.

In this manner, the fiber optic thermometry system 14 may detect whether the explosion proof valve 40 is erupting.

Specifically, the optical fiber temperature sensing member 28 may be installed above the explosion-proof valve 40 by a bracket to be spaced apart from the explosion-proof valve 40 by a certain distance. The thermometric host 22 is used to process the light signal to detect whether the explosion proof valve 40 is erupting. The outer layer temperature resistant temperature of the optical fiber temperature sensing element 28 is higher than the temperature of the substance ejected by the explosion-proof valve 40, so that even when the explosion-proof valve 40 is ejected, the ejected substance does not damage the optical fiber temperature sensing element 28. When the explosion-proof valve 40 is sprayed, the temperature of the sprayed substance is high, and the optical fiber temperature sensing element 28 can detect the temperature change. If the temperature measurement host 22 processes the returned optical signal of the optical fiber temperature sensing element 28, and the temperature of the optical fiber temperature sensing element 28 at the explosion-proof valve 40 is obtained to be greater than the first set threshold, the temperature measurement host 22 determines that the explosion-proof valve 40 is erupting. If the temperature measurement host 22 processes the optical signal returned by the optical fiber temperature sensing element 28, and the temperature of the optical fiber temperature sensing element 28 at the explosion-proof valve 40 is less than the second set threshold value, the temperature measurement host 22 determines that the explosion-proof valve 40 is not erupted. The second set threshold may be less than or equal to the first set threshold.

Upon determining that the explosion proof valve 40 is erupting, the alarm system 36 may issue an alarm message to alert the user.

In some embodiments, referring to fig. 3, the optical fiber temperature sensing element 28 includes a temperature sensing optical fiber 42, and the plurality of electrical connection pads 20 are electrically connected to the plurality of battery cells 18 and form a loop 41, and the temperature sensing optical fiber 42 is disposed on the plurality of electrical connection pads 20 along the loop 41.

In this way, the temperature sensing optical fiber 42 can be utilized to electrically connect the loops 41 formed by the plurality of battery cells 18 along the plurality of electrical connection sheets 20 for continuous temperature measurement, which is a distributed temperature measurement.

Specifically, the temperature sensing optical fiber 42 may be a distributed temperature sensing optical fiber 42, the plurality of electric connection pieces 20 are electrically connected with the plurality of battery cells 18 and are formed with a loop 41, the distributed temperature sensing optical fiber 42 may be arranged on the plurality of electric connection pieces 20 along the loop 41, the battery module 16 is provided with an optical fiber access point 43, the temperature sensing optical fiber 42 is distributed temperature measurement, and the measured object includes the electric connection pieces 20 and the battery cells 18, that is, the temperature along the line of the temperature sensing optical fiber 42, including the temperatures of all the electric connection pieces 20 and all the battery cells 18, can be detected by the temperature sensing optical fiber 42. In the distributed temperature sensing optical fiber 42 sensing technology, the temperature change is accurately measured by utilizing the sensitivity characteristic of the Raman scattered light signal in the optical fiber to the temperature. Each point on the temperature sensitive fiber 42 can sense and transmit a temperature signal. When a strong pulse laser signal is transmitted in the optical fiber, each point on the optical fiber can generate weak scattering on the laser signal, the signal intensity of scattered light has a certain function relation with the temperature at the point, and the temperature of each point can be obtained by detecting the intensity of the scattered light of each point and calculating the temperature of the point, so that the temperature field distribution on the whole optical fiber can be obtained.

As the light pulses travel along the optical fiber, various types of radiation scatter are generated, mainly Rayleigh (Rayleigh) scatter, brillouin (Brillouin) scatter, and Raman (Raman) scatter. The rayleigh scattered light is not fixedly related to the temperature change, and the temperature distribution cannot be calculated by the reflected light characteristic. Raman scattered light is sensitive to temperature changes and brillouin scattered light is sensitive to both temperature and strain. Because the brillouin scattering and the Rayleigh scattering have similar characteristics, the characteristic similarity is high in frequency spectrum, the brillouin scattering is difficult to separate through a filter, and meanwhile, the brillouin scattering is sensitive to stress and strain, so that the temperature sensing can be realized by using Raman scattering.

Among raman scattered light, the shorter wavelength is called anti-stokes light, and the longer wavelength is called stokes light, and the anti-stokes light and stokes light are symmetrically distributed on a spectrogram. The temperature sensitivity of anti-stokes light is much higher than stokes light intensity.

Theoretical studies have shown that the ratio of the intensity of anti-stokes light to stokes light is:

where λas and λs are the wavelengths of anti-stokes light and stokes light, respectively, both of which are related to the center wavelength of the incident laser light and the optical characteristics of the fiber material, and when the fiber temperature measurement system 14 determines, both are constants, h is the planck constant, c is the speed of light in vacuum, Δν is the raman shift, k is the boltzmann constant, and T is the temperature.

From the formula (1), it can be known that the light intensity ratio of anti-stokes light to stokes light is in a functional relation with the temperature of the point, and the corresponding temperature value of each point can be obtained by calculating the light intensity ratio of anti-stokes light to stokes light of each point, so as to realize real-time temperature monitoring of the measured object.

The laser pulse is transmitted from the optical transmitter of the temperature measuring host 22 along the optical fiber at time t1, reaches the temperature measuring point with the distance L, and then is reflected into the light returning receiver (such as a photoelectric detector) at time t2, and then there are:

where n is the refractive index of the fiber core. By detecting the time when the pulse signal returns to the light receiver, the position information of the temperature measuring point in the optical fiber can be obtained, and the accurate positioning of the measured object with abnormal temperature can be realized.

In one embodiment, the temperature measurement host 22 further includes a signal processing module, where the optical transmitter can emit detection light according to a certain sampling frequency, the optical receiver receives the returned optical signal and converts the optical signal into an electrical signal, and the signal processing module can process the electrical signal output by the optical receiver, for example, the signal processing module can condition, perform analog-digital conversion and digital signal processing on the signal output by the optical receiver, obtain the temperature field distribution along the temperature sensing optical fiber 42 in real time, and simultaneously implement distance positioning by using an optical time domain reflection technology, so that the fault point can be quickly and accurately positioned when the battery cell 18 fails. The sampling frequency may be set by the user or may be a default sampling frequency for the fiber optic thermometry system 14.

In one embodiment, the fiber optic thermometry system 14 may be calibrated. Specifically, when the energy storage device 100 is installed on the site, and the optical fiber temperature measurement system 14 determines that the distance between the optical transmitter and the measured object (e.g., the electrical connection piece 20, the explosion-proof valve 40, the battery cell 18, etc.) is obtained by measurement, and is a known amount (hereinafter referred to as a known distance), for example, the distance is equal to the length of the laid optical fiber. The measured object, such as the temperature of the first electric connection piece 20, may be artificially abnormal, the light emitter emits detection light into the temperature sensing optical fiber 42, and receives the optical signal returned by the temperature sensing optical fiber 42, the signal processing module processes the optical signal to obtain the position of the temperature abnormal point-the first connection piece, the distance between the position and the light emitter is calculated by using the optical time domain reflection technology (hereinafter referred to as calculated distance), the distance between the first electric connection piece 20 and the light emitter is known, the calculated distance is compared with the known distance, and if the deviation between the calculated distance and the known distance is within the expected range, the calculated distance does not need to be corrected. If the deviation between the calculated distance and the known distance is out of the expected range, correcting the calculated distance to enable the deviation between the calculated distance and the known distance to be in the expected range, and further improving the positioning accuracy of the temperature abnormal point.

In some embodiments, referring to fig. 4, the fiber optic temperature sensing element 28 includes a plurality of fiber optic gratings 44, each fiber optic grating 44 being disposed on a corresponding one of the objects under test.

In this way, the temperature of the object to be measured can be detected by the fiber grating 44.

Specifically, the fiber grating 44 may be coupled to the spectroscopy box 26 by an optical fiber. The light emitter may include a broadband light source, the thermometry host 22 includes a fiber bragg grating 44 demodulator, the fiber bragg grating 44 may connect the fiber bragg grating 44 demodulator and the broadband light source through the light splitting box 26 and the fiber optic splice box 24, the broadband light source emits detection light, and the fiber bragg grating 44 demodulator may determine the wavelength of the independent reflected light. Once the fiber grating 44 is subjected to the influence of temperature change, the grating pitch will change, the wavelength of the reflected light will also change, and different wavelengths will be reflected, and the wavelength of the reflected light is related to the temperature change, and the temperature change can be obtained by measuring the change of the wavelength, so as to obtain the temperature of the measured object (such as the electric connection piece 20, the battery cell 18, etc.). In one example, the fiber grating 44 may be a fiber Bragg grating 44.

In some embodiments, referring to fig. 5, the optical fiber temperature sensing element 28 includes a plurality of temperature sensing optical fibers 42, and an end of each of the temperature sensing optical fibers 42 is disposed on a corresponding one of the objects under test.

In this way, the temperature of the object to be measured can be detected by the plurality of temperature sensing optical fibers 42 as a point temperature measurement.

Specifically, the end of each temperature sensing optical fiber 42 can be used as a temperature probe, and the temperature probe is arranged on a corresponding measured object for point type temperature measurement. The detection light emitted by the light emitter can be emitted to the object to be detected (such as the electric connection sheet 20) through the tail end of the temperature sensing optical fiber 42, the object to be detected reflects the detection light to form scattered light, the scattered light enters the temperature sensing optical fiber 42 to return in the original path and is received by the light receiver, the light receiver converts the returned light signal into an electric signal, and the signal processing module processes the returned electric signal to obtain the temperature of the object to be detected.

In certain embodiments, the battery cluster 12 includes a high voltage cassette 32, and the light splitting cassette 26 is mounted within the high voltage cassette 32.

In this way, the light splitting box 26 can be protected without adding additional protection components.

Specifically, all the battery modules 16 of one battery cluster 12 are electrically connected in series, parallel, or series-parallel to form a battery module 16 system. The battery module 16 system has a total module positive electrode and a total module negative electrode, the high voltage box 32 can connect the total module positive electrode and the total module negative electrode, the high voltage box 32 is also provided with two connection ends, and the two connection ends can connect with external devices to discharge the external devices by using the battery module 16 or charge the battery module 16.

The light splitting box 26 is arranged in the high-voltage box 32, the high-voltage box 32 can protect the light splitting box 26, and additional protection components are needed to be added, so that the cost is reduced.

In summary, the energy storage device 100 of the present utility model has at least the following technical effects:

1. the optical fiber temperature measuring system 14 can realize temperature measurement of a continuous area, and the optical fibers are distributed according to a current loop, so that the temperature of the continuous area of the loop can be measured;

2. the energy storage device 100 can remove the temperature acquisition point of the primary plate BMU of the BMS, so that the BMS cost is reduced;

3. the optical fiber temperature sensing element 28 can be used as a medium for temperature measurement and transmission at the same time;

4. the optical fiber has the advantages of electromagnetic interference resistance, corrosion resistance, good insulating property and flexible installation mode;

5. the fiber optic thermometry system 14 may be in communication with a fire protection and alarm system 36;

6. the upper computer 34 can remotely transmit data, remotely view and control;

7. the temperature measuring host 22 can perform data analysis, accurately locate fault points for investigation and early warning in advance.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An energy storage device, comprising:

each battery cluster comprises a plurality of battery modules, each battery module comprises a plurality of battery cells, and the battery cells are electrically connected with each other through a plurality of electric connecting sheets;

the optical fiber temperature measurement system comprises a temperature measurement host, an optical fiber splice box, a light splitting box and optical fiber temperature sensing pieces, wherein the optical fiber temperature sensing pieces are arranged on each measured object, and the measured objects comprise the electric connection pieces and/or the battery monomers;

at least one light splitting box is arranged on each battery cluster and connected with the optical fiber temperature sensing piece;

the optical fiber splice boxes are connected with all the light splitting boxes on the battery clusters;

the temperature measuring host is connected with the optical fiber splice box, and is used for transmitting detection light to enter the optical fiber temperature sensing piece through the optical fiber splice box and the light splitting box in sequence, receiving optical signals of the optical fiber temperature sensing piece returned through the light splitting box and the optical fiber splice box in sequence, and processing the optical signals to obtain the temperature of the measured object.

2. The energy storage device of claim 1, wherein the optical fiber temperature sensing element comprises a temperature sensing optical fiber, the plurality of electrical connection pads electrically connect the plurality of battery cells and form a loop, the temperature sensing optical fiber being disposed on the plurality of electrical connection pads along the loop.

3. The energy storage device of claim 1, wherein the fiber optic temperature sensing element comprises a plurality of fiber optic gratings, each fiber optic grating disposed on a corresponding one of the objects under test.

4. The energy storage device of claim 1, wherein the optical fiber temperature sensing element comprises a plurality of temperature sensing optical fibers, each of which has a distal end disposed on a corresponding one of the objects under test.

5. The energy storage device of claim 1, wherein the energy storage device comprises an upper computer, the upper computer is in communication connection with the temperature measuring host and the server, the upper computer is configured to obtain the temperature of the measured object, and send the temperature of the measured object to the server so that the server displays the temperature of the measured object.

6. The energy storage device of claim 5, wherein the energy storage device comprises a central control convergence cabinet, and the fiber optic splice closure, the temperature measurement host and the host computer are mounted within the central control convergence cabinet.

7. The energy storage device of claim 1, wherein the energy storage device comprises an alarm system, the alarm system is in communication connection with the temperature measurement host, the alarm system is configured to obtain the temperature of the measured object, and send out alarm information when the temperature of the measured object is greater than a preset temperature.

8. The energy storage device of claim 1, wherein the energy storage device comprises a fire protection system in communication connection with the temperature measurement host, the fire protection system comprises a plurality of fire protection spray heads, each fire protection spray head is arranged corresponding to at least one battery module, the fire protection system is used for acquiring the temperature of the measured object, and under the condition that the temperature of the measured object is greater than a preset temperature, the fire protection spray heads corresponding to the battery modules for controlling the temperature of the measured object to be greater than the preset temperature execute fire protection operation.

9. The energy storage device of claim 1, wherein the battery cell includes an explosion-proof valve, and the fiber optic temperature sensing element is spaced above the explosion-proof valve.

10. The energy storage device of claim 1, wherein said battery cluster comprises a high voltage cassette, said light splitting cassette being mounted within said high voltage cassette.