Energy storage module distributed optical fiber temperature measuring device and method

Abstract

The invention discloses an energy storage module distributed optical fiber temperature measuring device, which comprises a control circuit, a laser, a detector, a wavelength division multiplexer and an energy storage module cover plate, and is characterized in that the energy storage module cover plate comprises a temperature sensing optical fiber; wherein the control circuit is respectively connected with the laser and the detector, the laser and the detector are both connected with the wavelength division multiplexer, and the wavelength division multiplexer is connected with the energy storage module cover plate; and when the energy storage module cover plate covers the energy storage case, the temperature sensing optical fiber is in contact with a battery cell temperature measuring point. The invention further provides a corresponding temperature measuring method. According to the scheme, the problem of temperature full-coverage monitoring of the sensing optical fiber applied to the new energy storage module can be solved, and the system is low in cost, high in precision, small in deviation, low in failure rate and convenient to maintain.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber temperature sensing, and in particular relates to a distributed optical fiber temperature measurement device and method for an energy storage module. Background Art

[0002] Safety issues are one of the main obstacles to the large-scale application of energy storage modules. As the energy density of energy storage modules continues to increase, improving their safety becomes increasingly urgent. Thermal runaway is a key safety issue for energy storage modules. Thermal runaway is often caused by the module's heat generation rate being much higher than its heat dissipation rate, resulting in a large amount of heat accumulation that is not dissipated in a timely manner. With the widespread application of new energy storage modules in a wide range of fields, including renewable energy power generation, grid-side, industrial and commercial user-side, power ancillary services, microgrids, photovoltaic charging stations, energy internet, smart energy, data centers, energy-saving retrofits, and shore power retrofits, as well as the gradual expansion of energy storage power station container power stations to megawatts, tens of megawatts, and even hundreds of megawatts, the temperature monitoring subsystem of the energy storage module has become a vital component of the energy storage system.

[0003] Timely understanding of the thermal status of energy storage modules helps the BCMS (Battery Cluster Management Unit) make rapid thermal management decisions. Currently, energy storage module temperature measurement primarily relies on thermocouples fixed to the aluminum bars of the battery cells. This approach presents safety risks. The temperature probes on each aluminum bar are connected to their wires, posing a risk of diverting primary current to the secondary. Furthermore, the temperature wires connecting the aluminum bars are bundled together. As the wires age and become damaged, the battery cells may become indirectly connected. Summary of the Invention

[0004] The purpose of the present invention is to provide a distributed optical fiber temperature measurement device and method for an energy storage module to solve the safety hazards existing in the temperature measurement technology of the energy storage module.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] As a first aspect of the present application, a distributed optical fiber temperature measurement device for an energy storage module is proposed, comprising: a control circuit, a laser, a detector, a wavelength division multiplexer, and an energy storage module cover plate, wherein the energy storage module cover plate contains a temperature-sensitive optical fiber; wherein the control circuit is connected to the laser and the detector, respectively, the laser and the detector are both connected to the wavelength division multiplexer, and the wavelength division multiplexer is connected to the energy storage module cover plate; the energy storage module cover plate covers the energy storage chassis, and the temperature-sensitive optical fiber contacts the temperature measurement point of the battery cell;

[0007] The control circuit controls the laser to emit excitation light, which enters the energy storage module cover after passing through the wavelength division multiplexer. The excitation light generates scattered light carrying temperature information in the temperature-sensitive optical fiber of the energy storage module cover; the backscattered light returns to the wavelength division multiplexer through the energy storage module cover along the original path, and the two beams of signal light separated from the wavelength division multiplexer are converted into electrical signals by the detector; the control circuit receives the electrical signal and demodulates the temperature information.

[0008] According to some embodiments, the wavelength division multiplexer includes a wavelength division multiplexer excitation light input port, a wavelength division multiplexer excitation light output port and two wavelength division multiplexer signal light output ports, wherein the laser is connected to the wavelength division multiplexer excitation light input port, the detector is connected to the two wavelength division multiplexer signal light output ports, and the energy storage module cover is connected to the wavelength division multiplexer excitation light output port.

[0009] According to some embodiments, the size of the energy storage module cover has an adjustable function, which is adjusted according to the actual size of the battery core aluminum bar, so that the energy storage module cover containing the temperature-sensitive optical fiber fits tightly with the battery core aluminum bar.

[0010] According to some embodiments, the energy storage module cover can be installed and removed as a whole.

[0011] As a second aspect of the present application, a method for measuring temperature using the distributed optical fiber temperature measurement device according to any one of claims 1 to 4 is proposed, comprising:

[0012] Step 1: The control circuit controls the laser to emit an excitation pulse laser;

[0013] Step 2: The wavelength division multiplexer receives the excitation light from the laser and transmits it to the energy storage module cover;

[0014] Step 3: The excitation light generates scattered light carrying temperature information in the temperature-sensitive optical fiber of the energy storage module cover;

[0015] Step 4: The backscattered light returns to the wavelength division multiplexer via the energy storage module cover plate containing the temperature-sensitive optical fiber;

[0016] Step 5: The scattered light is separated into two signal beams after passing through the wavelength division multiplexer and transmitted to the detector. The detector converts the two signal beams into electrical signals and sends them to the control circuit;

[0017] Step 6: The control circuit receives the electrical signal and demodulates the temperature information.

[0018] Compared with existing technologies, the present invention offers the following advantages: By employing the aforementioned solution, using an energy storage module cover plate incorporating temperature-sensing optical fibers, the entire mesh is bonded to the aluminum bars of the battery cells during installation, enabling more accurate temperature measurement. Because the temperature-sensing optical fibers are meshed and their relative positions are fixed, a single calibration is sufficient, eliminating the need for subsequent re-calibration during installation. This temperature measurement solution also offers advantages such as interference resistance, passive operation, and the ability to avoid short circuits. This provides new insights into comprehensive temperature monitoring of energy storage modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the distributed temperature measurement system provided by an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of each port of the wavelength division multiplexer;

[0021] Figure 3 This is a flow chart of the temperature measurement method of the distributed optical fiber temperature measurement device provided in the embodiment of the present application.

[0022] Among them: 1-control circuit, 2-laser, 3-detector, 4-wavelength division multiplexer, 4.1-wavelength division multiplexer excitation light input port, 4.2\4.3-wavelength division multiplexer signal light output port, 4.4-wavelength division multiplexer excitation light output port, 5-energy storage module cover. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0024] The temperature monitoring subsystem of the energy storage module is a crucial component of the energy storage system. Current temperature measurement for energy storage modules primarily relies on thermocouples fixed to the aluminum bars of the battery cells, posing a safety hazard. This application proposes a technical solution for energy storage module temperature measurement based on distributed optical fiber temperature measurement. This solution cleverly integrates the temperature measurement optical cable with the energy storage module cover, allowing the cover to automatically contact the battery cell's temperature measurement points while being placed on the energy storage chassis.

[0025] like Figure 1 As shown, an embodiment of the present application provides a distributed optical fiber temperature measurement device for an energy storage module, including a control circuit 1, a laser 2, a detector 3, a wavelength division multiplexer 4 and an energy storage module cover 5 containing a temperature-sensitive optical fiber, wherein the control circuit 1 is connected to the laser 2 and the detector 3, the laser 2 and the detector 3 are both connected to the wavelength division multiplexer 4, and the energy storage module cover 5 containing the temperature-sensitive optical fiber is connected to the wavelength division multiplexer 4; the control circuit 1 synchronously controls the laser 2 to emit light and the detector 3 to receive light, and demodulates the signal; the laser 2 generates a pulsed laser as an excitation source, the detector 3 converts the optical signal into an electrical signal, the wavelength division multiplexer 4 receives the excitation light from the laser 2 and transmits it to the energy storage module cover 5, and the temperature-sensitive optical fiber in the energy storage module cover 5 is responsible for generating temperature-sensitive quantities.

[0026] Figure 1 Control circuit 1 controls laser 2 to emit excitation light. This excitation light passes through wavelength division multiplexer 4 and enters energy storage module cover 5. The excitation light generates scattered light carrying temperature information in the temperature-sensitive optical fiber of energy storage module cover 5. The backscattered light returns to wavelength division multiplexer 4 along the same path through energy storage module cover 5. The two signal beams separated by wavelength division multiplexer 4 are converted into electrical signals by detector 3. Control circuit 1 receives the electrical signals and demodulates them to obtain temperature information. This temperature information corresponds to the aluminum bar of the battery cell, thus specifically reflecting the actual temperature of each battery cell.

[0027] In this embodiment, the energy storage module cover plate, which incorporates temperature-sensing optical fibers, is fitted with a mesh that aligns seamlessly with the aluminum bars of the battery cells during installation, resulting in more accurate temperature measurement. Because the temperature-sensing optical fibers are meshed and their relative positions are fixed, a single calibration is sufficient, eliminating the need for repeated calibration during subsequent installations. This temperature measurement solution also offers advantages such as interference resistance, passive operation, and the ability to avoid short circuits.

[0028] In some embodiments, a wavelength division multiplexer couples multiple signals of different wavelengths onto a single optical fiber for simultaneous transmission. The main purpose of a wavelength division multiplexer is to increase the available bandwidth of an optical fiber. It can be used to expand the capacity without laying more optical fibers. It is a major component for capacity expansion in modern optical fiber communications. The structure of the wavelength division multiplexer 4 is shown in FIG. Figure 2 As shown, it includes a wavelength division multiplexer excitation light input port 4.1, two wavelength division multiplexer signal light output ports 4.2 and 4.3, and a wavelength division multiplexer excitation light output port 4.4. The laser 2 is connected to the wavelength division multiplexer excitation light input port 4.1; the wavelength division multiplexer divides the detection signal into lights of different wavelengths and outputs them from ports 4.2 and 4.3 respectively; the detector 3 is connected to the two wavelength division multiplexer signal light output ports 4.2 and 4.3; and the energy storage module cover 5 containing the temperature-sensitive optical fiber is connected to the wavelength division multiplexer excitation light output port 4.4.

[0029] In a preferred embodiment, the size of the energy storage module cover 5 containing the temperature-sensitive optical fiber has an adjustment function, which can be adjusted according to the actual size of the battery core aluminum bar, so that the energy storage module cover 5 containing the temperature-sensitive optical fiber can fit more closely with the battery core aluminum bar to improve the temperature measurement accuracy.

[0030] In a preferred embodiment, the energy storage module cover 5 including the temperature-sensitive optical fiber can be installed and disassembled on the entire surface. In this way, when the battery core aluminum bar is maintained, the module cover can be removed and the entire surface can be disassembled and installed at one time, making its installation and maintenance simple and easy, greatly improving work efficiency.

[0031] The present invention also provides a method for measuring temperature using the above-mentioned distributed optical fiber temperature measuring device, comprising the following steps:

[0032] S1: Control circuit 1 controls laser 2 to emit excitation pulse laser;

[0033] S2: The wavelength division multiplexer 4 receives the excitation light from the laser 2 and transmits it to the energy storage module cover 5;

[0034] S3: The excitation light generates scattered light carrying temperature information in the temperature-sensitive optical fiber of the energy storage module cover 5;

[0035] S4: The backscattered light returns to the wavelength division multiplexer 4 via the energy storage module cover 5 containing the temperature-sensitive optical fiber;

[0036] S5: The scattered light is separated into two signal beams after passing through the wavelength division multiplexer 4 and transmitted to the detector 3. The detector 3 converts the two signal beams into electrical signals and sends them to the control circuit 1.

[0037] S6: The control circuit 1 receives the electrical signal and demodulates the temperature information.

[0038] The above embodiments are only for illustrating the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention.

Claims

1. A distributed optical fiber temperature measurement device for an energy storage module, characterized in that: include: A control circuit (1), a laser (2), a detector (3), a wavelength division multiplexer (4) and an energy storage module cover plate (5), wherein the energy storage module cover plate (5) comprises a temperature-sensitive optical fiber; wherein the control circuit (1) is connected to the laser (2) and the detector (3), respectively; the laser (2) and the detector (3) are both connected to the wavelength division multiplexer (4), and the wavelength division multiplexer (4) is connected to the energy storage module cover plate (5); the energy storage module cover plate (5) is covered on the energy storage chassis, and the temperature-sensitive optical fiber contacts the temperature measurement point of the battery core; The control circuit (1) controls the laser (2) to emit excitation light, and the excitation light enters the energy storage module cover (5) after passing through the wavelength division multiplexer (4). The excitation light generates scattered light carrying temperature information in the temperature-sensitive optical fiber of the energy storage module cover (5); the backscattered light returns to the wavelength division multiplexer (4) along the original path through the energy storage module cover (5); the two signal lights separated from the wavelength division multiplexer (4) are converted into electrical signals by the detector (3); and the control circuit (1) demodulates the temperature information after receiving the electrical signals.

2. The device according to claim 1, wherein: The wavelength division multiplexer (4) comprises a wavelength division multiplexer excitation light input port (4.1), a wavelength division multiplexer excitation light output port (4.4), and two wavelength division multiplexer signal light output ports (4.2; 4.3), wherein the laser (2) is connected to the wavelength division multiplexer excitation light input port, the detector (3) is connected to the two wavelength division multiplexer signal light output ports (4.2; 4.3), and the energy storage module cover (5) is connected to the wavelength division multiplexer excitation light output port (4.4).

3. The device according to claim 1, wherein: The size of the energy storage module cover plate (5) has an adjustable function and is adjusted according to the actual size of the battery core aluminum bar, so that the energy storage module cover plate containing the temperature-sensitive optical fiber fits tightly with the battery core aluminum bar.

4. The device according to claim 1, wherein: The energy storage module cover plate (5) can be installed and disassembled as a whole.

5. A method for measuring temperature using the distributed optical fiber temperature measuring device according to any one of claims 1 to 4, characterized in that: include: Step 1: The control circuit (1) controls the laser (2) to emit an excitation pulse laser; Step 2: The wavelength division multiplexer (4) receives the excitation light from the laser (2) and transmits it to the energy storage module cover (5); Step 3: The excitation light generates scattered light carrying temperature information in the temperature-sensitive optical fiber of the energy storage module cover (5); Step 4: The backscattered light returns to the wavelength division multiplexer (4) via the energy storage module cover (5) containing the temperature-sensitive optical fiber; Step 5: The scattered light is separated into two signal beams after passing through the wavelength division multiplexer (4) and transmitted to the detector (3). The detector (3) converts the two signal beams into electrical signals and sends them to the control circuit (1); Step 6: The control circuit (1) receives the electrical signal and demodulates the temperature information.

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