Battery pack monitoring system, vehicle and installation method of battery pack monitoring system

Abstract

The invention relates to the technical field of vehicles, and discloses a battery pack monitoring system, a vehicle and an installation method of the battery pack monitoring system.The vehicle comprises a battery pack and a battery pack bottom plate, the battery pack is arranged on the battery pack bottom plate, and the battery pack monitoring system comprises a signal processing assembly and at least one temperature monitoring assembly; the at least one temperature monitoring assembly is arranged on the battery pack and / or a battery pack bottom plate, and the signal processing assembly is arranged in the vehicle; the signal processing assembly is connected with the at least one temperature monitoring assembly and is used for processing and displaying the received signal; the temperature monitoring assembly comprises an optical fiber, a connecting piece and a first protection piece, the optical fiber is connected with the signal processing assembly through the connecting piece, at least one grating is arranged in the optical fiber, and the connecting piece is sleeved with the first protection piece. According to the battery pack monitoring system provided by the invention, the temperature change condition of the battery pack bottom plate can be monitored in real time, a driver is reminded in time, and potential safety risks are prevented.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a battery pack monitoring system, a vehicle, and an installation method of the battery pack monitoring system. Background Art

[0002] Amidst the rapid development of the new energy industry, new energy vehicles are gaining increasing attention and recognition. As a core component of electric vehicles, the safety of the power battery pack has become crucial. This is especially true during the operation of new energy vehicles, where the power battery pack can generate significant heat during charging and discharging. Excessive temperatures can lead to thermal runaway, potentially causing fire or explosion.

[0003] Therefore, how to monitor the temperature changes of the power battery pack in real time is an urgent problem that needs to be solved. Summary of the Invention

[0004] In view of this, the present application provides a battery pack monitoring system, a vehicle, and an installation method of the battery pack monitoring system, which can monitor the temperature changes of the battery pack bottom plate in real time and promptly remind the driver, thereby effectively preventing potential safety risks.

[0005] Specifically, this application includes the following technical solutions:

[0006] In a first aspect, the present application provides a battery pack monitoring system, which is applied to a vehicle. The vehicle includes a battery pack and a battery pack base plate, wherein the battery pack is disposed on the battery pack base plate. The battery pack monitoring system includes a signal processing component and at least one temperature monitoring component, wherein the at least one temperature monitoring component is disposed on the battery pack and / or the battery pack base plate, and the signal processing component is disposed in the vehicle.

[0007] The signal processing component is connected to the at least one temperature monitoring component and is used to process and display the received signal;

[0008] The temperature monitoring component includes an optical fiber, a connector and a first protective component. The optical fiber is connected to the signal processing component through the connector, and at least one grating is provided in the optical fiber. The first protective component is sleeved on the connector.

[0009] In one embodiment of the present application, the first protective member has heat insulation performance, and the thermal conductivity of the first protective member is smaller than the thermal conductivity of the optical fiber.

[0010] In one embodiment of the present application, the first protective member is a glass fiber sleeve.

[0011] In one embodiment of the present application, the optical fiber is any one of quartz optical fiber, crystal-derived optical fiber, and photonic crystal optical fiber.

[0012] In one embodiment of the present application, the temperature monitoring assembly further includes a second protective member, which is sleeved on the optical fiber, wherein the second protective member is any one of a rubber sleeve, a metal tube and a metal braided mesh.

[0013] In one embodiment of the present application, there are multiple temperature monitoring components, and the multiple temperature monitoring components are respectively connected to the signal processing components, wherein multiple gratings are arranged at intervals in the optical fiber of each temperature monitoring component, and the optical fibers in the multiple temperature monitoring components are interwoven into a mesh on the battery pack and / or the battery pack bottom plate.

[0014] In one embodiment of the present application, the plurality of temperature monitoring assemblies include a plurality of first temperature monitoring components, and the plurality of first temperature monitoring components are disposed on an outer side wall of the battery pack;

[0015] The plurality of temperature monitoring assemblies further include a plurality of second temperature monitoring components, and the plurality of second temperature monitoring components are arranged on the battery pack bottom plate.

[0016] In one embodiment of the present application, the battery pack includes at least two battery groups, each of the battery groups includes a plurality of battery cells, the number of the first temperature monitoring components is the same as the number of the battery groups, and the optical fiber in each of the first temperature monitoring components includes a plurality of gratings, and the number of the gratings in each of the optical fibers is the same as the number of the battery cells in each of the battery groups.

[0017] In one embodiment of the present application, the signal processing component includes a fiber concentrator, a demodulator, and a first optical splitter, and the fiber concentrator is connected to the demodulator;

[0018] Each of the first temperature monitoring components is connected to the fiber collector via the first optical splitter; and / or,

[0019] The signal processing component further includes a second optical splitter, and each of the second temperature monitoring components is connected to the fiber collector via the second optical splitter.

[0020] A second aspect of the present application provides a vehicle, which includes the above-mentioned battery pack monitoring system.

[0021] A third aspect of the present application provides an installation method using the above-mentioned battery pack monitoring system, the installation method comprising:

[0022] For each of the temperature monitoring components, the optical fiber is fixedly connected to the outer wall of the battery pack or the bottom plate of the battery pack using an adhesive to fix all the temperature monitoring components;

[0023] Use tape to wrap the connectors of all the temperature monitoring components and connect them to the fiber outlet holes of the battery pack bottom plate;

[0024] The fiber outlet hole is sealed with a sealing member, and the battery pack bottom plate is fixed with a fixing member;

[0025] All the connectors are connected to the signal processing component using a welding machine.

[0026] In one embodiment of the present application, the signal processing component includes a splitter, a fiber concentrator, a demodulator, and a processor; characterized in that the step of connecting all the connectors to the signal processing component using a fusion splicer includes:

[0027] All the connectors are connected to different optical splitters in groups of two or four, and each optical splitter is connected to the demodulator through the same fiber collector;

[0028] The demodulator is then connected to the processor.

[0029] The beneficial effects of the technical solutions provided by the embodiments of the present application include at least:

[0030] In the battery pack monitoring system provided by the embodiment of the present application, a temperature monitoring component is provided on the battery pack and / or battery pack bottom plate in the vehicle, and the temperature monitoring component includes an optical fiber, and at least one grating is provided inside the optical fiber. The grating in the optical fiber is a periodic refractive index distribution structure that can reflect light of a specific wavelength. When the temperature of the battery pack and / or the battery pack bottom plate changes, under the influence of thermal expansion effect and thermo-optical effect, the grating period and the optical fiber refractive index will change. The working effect of the two causes the Bragg wavelength to drift linearly with temperature. The temperature monitoring component is connected to the signal processing component, and the signal processing component can process the received signal, for example, convert the wavelength drift into a specific strain value, and output the result (for example, to a display screen) for the driver's reference. It can timely monitor the temperature of the battery pack and / or the battery pack bottom plate, and promptly remind the driver, thereby effectively preventing potential safety risks. In addition, the optical fiber needs to be connected to the signal processing component through a connector (such as a connector). The connector (such as a pigtail) itself is fragile and can be easily broken by bending or stretching due to external force. The protective part has high strength and rigidity, which can wrap the connector and limit its excessive bending, avoiding damage or breakage of the optical fiber due to mechanical stress, and extending the service life of the battery pack monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A schematic diagram of the structure of a temperature monitoring assembly provided in an embodiment of the present application is shown;

[0033] Figure 2 A module diagram of a battery pack monitoring system provided in an embodiment of the present application is shown;

[0034] Figure 3 A diagram showing the positional relationship between the first protective member and the connecting member provided in an embodiment of the present application is shown;

[0035] Figure 4 A schematic diagram showing the structure of a first temperature monitoring component provided in an embodiment of the present application when it is disposed on a battery pack;

[0036] Figure 5 A schematic diagram of the structure of the second temperature monitoring component provided in an embodiment of the present application when it is arranged on the bottom plate of the battery pack is shown.

[0037] Reference numerals:

[0038] 1. Signal processing component; 11. Fiber collector; 12. Demodulator; 13. First optical splitter; 14. Second optical splitter;

[0039] 2. Temperature monitoring component; 21. Optical fiber; 211. Grating; 22. Connector; 23. First protective member; 24. Second protective member; 25. First temperature monitoring member; 26. Second temperature monitoring member. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In order to make the technical solutions and advantages of the present application clearer, the battery pack monitoring system, vehicle and battery pack monitoring system installation method, etc. will be described in detail below in conjunction with the drawings.

[0041] Amidst the rapid development of the new energy industry, new energy vehicles are gaining increasing attention and recognition. As a core component of electric vehicles, the safety of the power battery pack has become crucial. This is especially true during the operation of new energy vehicles, where the power battery pack can generate significant heat during charging and discharging. Excessive temperatures can lead to thermal runaway, potentially causing fire or explosion.

[0042] In this regard, the present application provides a battery pack monitoring system for use in vehicles, such as Figure 1 、 Figure 2 and Figure 3 As shown, the vehicle includes a battery pack and a battery pack base plate, the battery pack is arranged on the battery pack base plate, the battery pack monitoring system includes a signal processing component 1 and at least one temperature monitoring component 2, at least one temperature monitoring component 2 is arranged on the battery pack and / or the battery pack base plate, and the signal processing component 1 is arranged in the vehicle; the signal processing component 1 is connected to at least one temperature monitoring component 2, and is used to process and display the received signal; the temperature monitoring component 2 includes an optical fiber 21, a connector 22 and a first protective component 23, the optical fiber 21 is connected to the signal processing component 1 through the connector 22, and at least one grating 211 is arranged in the optical fiber 21, and the first protective component 23 is sleeved on the connector 22.

[0043] In the battery pack monitoring system provided by the embodiment of the present application, a temperature monitoring component 2 is provided on the battery pack and / or the battery pack bottom plate in the vehicle, and the temperature monitoring component 2 includes an optical fiber 21, and at least one grating 211 is provided inside the optical fiber 21. The grating 211 in the optical fiber 21 is a periodic refractive index distribution structure that can reflect light of a specific wavelength. When the temperature of the battery pack and / or the battery pack bottom plate changes, under the influence of thermal expansion effect and thermo-optical effect, the period of the grating 211 and the refractive index of the optical fiber 21 will change. The working effect of the two causes the Bragg wavelength to drift linearly with temperature. The temperature monitoring component 2 is connected to the signal processing component 1, and the signal processing component 1 can process the received signal, such as converting the wavelength drift into a specific strain value, and output the result (for example, projecting it to a display screen) for the driver's reference, so as to timely monitor the temperature of the battery pack and / or the battery pack bottom plate, and promptly remind the driver, thereby effectively preventing potential safety risks. In addition, optical fiber 21 needs to be connected to signal processing assembly 1 via connector 22 (e.g., a connector). Connector 22 (e.g., a pigtail) is inherently fragile and easily broken by bending or stretching. The protective member, with its high strength and rigidity, wraps around connector 22 and limits excessive bending, preventing damage or breakage of optical fiber 21 due to mechanical stress and extending the service life of the battery pack monitoring system.

[0044] In some embodiments, the connector 22 may include a switching portion and a pigtail, wherein the optical fiber 21, the switching portion, and the pigtail are sequentially connected, and the pigtail is connected to the signal processing component 1. The switching portion can achieve a reliable connection between the optical fiber 21 and the pigtail and ensure efficient coupling of the optical signal, and can be, for example, a fiber optic connector, a coupler, etc. When the switching portion is a fiber optic connector, it can achieve quick plugging and unplugging of the optical fiber 21 and the pigtail, facilitating system installation, commissioning, and maintenance (such as replacing the pigtail or equipment).

[0045] Pigtails can be used as extension cables to transmit optical signals from the adapter to remote devices, adapting to complex cabling requirements. Additionally, in wavelength division multiplexing systems, pigtails can adapt to specific wavelengths of optical signals, ensuring that the signal matches the device's spectral range.

[0046] In some embodiments, the first protective member 23 may be sleeved on the pigtail.

[0047] In one embodiment of the present application, the first protective member 23 has heat insulation performance, and the thermal conductivity of the first protective member 23 is less than or equal to the thermal conductivity of the optical fiber 21 .

[0048] The battery pack may generate localized high temperatures during operation due to overcharging, short circuiting, or high-load operation. The fiber pigtail itself is relatively fragile and cannot withstand high temperatures. Therefore, under the influence of high temperatures, the stability of the fiber pigtail signal transmission function may be affected, thereby affecting the overall monitoring accuracy.

[0049] Therefore, in the battery pack monitoring system provided in the embodiment of the present application, the first protective member 23 can also have heat insulation properties. While being resistant to high temperatures, it can isolate heat from the outside to prevent heat from affecting the pigtail, thereby ensuring the continuous and reliable operation of the temperature monitoring component 2 and ensuring monitoring accuracy.

[0050] In one embodiment of the present application, the first protective member 23 is a glass fiber sleeve. The glass fiber sleeve has good high temperature resistance and can withstand high temperatures, thereby protecting the pigtail from damage in a high temperature environment and ensuring the normal operation of the temperature monitoring assembly 2.

[0051] Furthermore, the battery pack may contain electrolyte leaks or volatile chemicals. Glass fiber has good corrosion resistance to most acids, bases, and organic solvents, protecting the pigtail from corrosion and extending the service life of the temperature monitoring assembly 2. Furthermore, the glass fiber casing is lightweight and flexible, making it easy to cut and bend, reducing installation difficulty and cost.

[0052] Optionally, the glass fiber sleeve may have a length of 100-500 mm and an outer diameter of 1.5 mm.

[0053] In one embodiment of the present application, the optical fiber 21 is any one of a quartz optical fiber 21 , a crystal-derived optical fiber 21 , and a photonic crystal optical fiber 21 .

[0054] In the battery pack monitoring system provided in the embodiment of the present application, the optical fiber 21 can adopt a high-temperature resistant optical fiber 21, such as quartz optical fiber 21, crystal-derived optical fiber 21, etc. When the lithium-ion battery is overcharged, short-circuited or charged and discharged at a high rate, the local temperature may soar to above 200°C, and even cause thermal runaway (the temperature can reach 600-1000°C). High-temperature resistant optical fiber 21 (such as quartz optical fiber 21) can work stably for a long time at 200-500°C, and withstand higher temperatures in the short term, avoiding carbonization of the optical fiber 21 due to high temperature or signal interruption, ensuring that the temperature changes can be continuously monitored in the early stage of battery thermal runaway, buying time for safety warnings.

[0055] Furthermore, the battery pack continuously generates heat during long-term cycling (e.g., at 25-60°C during normal operation). Conventional optical fiber 21 can easily soften and become brittle due to long-term heat exposure, leading to breakage. High-temperature-resistant optical fiber 21 can withstand thermal aging through hundreds of charge and discharge cycles, maintaining the long-term effectiveness of the monitoring system.

[0056] It should be noted that the rear end of the pigtail may also be provided with a jumper head, a dust cap and other components, which are conventional settings in the field and will not be described in detail here.

[0057] In one embodiment of the present application, the temperature monitoring assembly 2 may further include a second protective member 24 , which is sleeved on the optical fiber 21 , wherein the second protective member 24 is any one of a rubber sleeve, a metal tube, and a metal braided mesh.

[0058] In the battery pack monitoring assembly provided in the embodiments of the present application, the metal second protective member 24 has high rigidity and strength, effectively resisting external impact forces such as stretching, compression, and bending of the optical fiber 21. This prevents damage to the optical fiber 21 due to external forces during operation, improves the durability and reliability of the optical fiber 21 strain sensor, and enables it to adapt to various complex operating environments.

[0059] Furthermore, the metal second protective member 24 facilitates positioning and securing the temperature monitoring assembly 2 during installation. For example, by securing the second protective member 24, the temperature monitoring assembly 2 can be accurately installed, ensuring that it is in the appropriate measurement position and is less likely to shift during long-term use, thereby ensuring accurate and consistent measurements.

[0060] In one embodiment of the present application, there are multiple temperature monitoring components 2, and the multiple temperature monitoring components 2 are respectively connected to the signal processing component 1, wherein multiple gratings 211 are arranged at intervals in the optical fiber 21 in each temperature monitoring component 2, and the optical fibers 21 in the multiple temperature monitoring components 2 are interwoven into a mesh on the battery pack and / or the battery pack bottom plate.

[0061] In some embodiments, multiple gratings 211 may be spaced apart within the optical fiber 21, providing multiple monitoring points, enabling simultaneous temperature monitoring of multiple locations on the battery pack and / or battery pack base. For example, the gratings 211 are 3 to 5 mm long, enabling multiple monitoring points to be set up on the same optical fiber 21, thereby achieving simultaneous detection at multiple points without interfering with each other.

[0062] It should be noted that the number of gratings 211 can be selected and adjusted according to the number of monitoring points required on the battery pack and / or the number of monitoring points required on the bottom plate of the battery pack.

[0063] In the battery monitoring system provided in the embodiments of the present application, multiple temperature monitoring components are provided to provide the battery management system with rich and accurate strain data. Based on this data, the battery management system can more accurately assess the temperature change state of the battery pack and / or the battery pack base plate, and then adjust the power supply state of the battery pack. For example, when the temperature of the battery pack and / or the battery pack base plate is high, the battery management system can automatically cut off the power supply to the battery pack in the high temperature area while alerting the user.

[0064] Furthermore, multiple temperature monitoring components can continuously and stably monitor temperature changes in the battery pack and / or the battery pack baseplate under these complex operating conditions, ensuring safe and reliable battery operation in various environments. Furthermore, multiple temperature monitoring components 2 are interwoven into a mesh on the battery pack and / or the battery pack baseplate, i.e., the monitoring points on each optical fiber 21 are located at different positions. This allows for monitoring and feedback on temperature changes at different locations, enabling rapid location determination. This helps accurately determine the point of failure, facilitates subsequent maintenance and repair work, and improves troubleshooting efficiency.

[0065] In one embodiment of the present application, the multiple temperature monitoring assemblies 2 include multiple first temperature monitoring components 25, which are disposed on the outer wall of the battery pack; and multiple second temperature monitoring components 26, which are disposed on the bottom plate of the battery pack. Specifically, the multiple first temperature monitoring components 25 can monitor the temperature changes of the battery pack, while the multiple second temperature monitoring components 26 can monitor the temperature changes of the bottom plate of the battery pack.

[0066] In one embodiment of the present application, a battery pack includes at least two battery groups, each of which includes multiple battery cells. The number of first temperature monitoring components 25 is the same as the number of battery groups, and the optical fiber 21 in each first temperature monitoring component 25 includes multiple gratings 211. The number of gratings 211 in each optical fiber 21 is the same as the number of battery cells in each battery group. That is, each battery group in the battery pack is provided with a first temperature monitoring component 25, and the number of gratings 211 provided in the optical fiber 21 of the first temperature monitoring component 25 is equal to the number of battery cells in each battery group. In other words, a corresponding temperature monitoring point is provided for each battery cell, so that the temperature of all battery cells in the battery pack can be monitored.

[0067] For example, the battery pack contains 112 cells, which are divided into battery groups, and each battery group consists of 32, 32, 24, and 24 batteries respectively.

[0068] In one embodiment, if Figure 4 As shown, four first temperature monitoring elements 25 can be provided, and each first temperature monitoring element 25 can have 28 gratings 211, i.e., 28 temperature monitoring points. Specifically, the optical fiber 21 of each first temperature monitoring element 25 can be divided into a first portion and a second portion. The first portion is provided with 20 gratings 211, and the second portion is provided with 8 gratings 211. The first portion can be integral or formed by fusion-coupling an array of 16 gratings 211 and an array of 4 gratings 211.

[0069] In some embodiments, the number of first temperature monitoring components 25 may be twice the number of battery packs, wherein half of the first temperature monitoring components 25 monitor the temperature of the battery tabs, and the other half of the first temperature monitoring components 25 monitor the temperature of the battery sides.

[0070] In some embodiments, as Figure 5 As shown, the number of second temperature monitoring components 26 can be four, the number of gratings 211 in the optical fiber 21 in each second temperature monitoring component 26 is five, and the four second temperature monitoring components 26 can be arranged in sequence at intervals, that is, the temperature at 20 positions on the bottom plate of the battery pack can be monitored.

[0071] In one embodiment of the present application, the signal processing component 1 includes a fiber collector 11, a demodulator 12 and a first splitter 13, and the fiber collector 11 is connected to the demodulator 12; each first temperature monitoring component 25 is connected to the fiber collector 11 through the first splitter 13; and / or, the signal processing component 1 also includes a second splitter 14, and each second temperature monitoring component 26 is connected to the fiber collector 11 through the second splitter 14.

[0072] In the battery pack monitoring assembly provided in this embodiment, multiple first temperature monitoring components 25 are connected to the fiber collector 11 via the same first optical splitter 13, which in turn is connected to the demodulator 12 via the fiber collector 11. This configuration reduces the number of interfaces on the fiber collector 11 and simplifies wiring. The principles for the second optical splitter 14 are similar and will not be elaborated on here.

[0073] In some embodiments, the number of first spectrometers 13 can be two, two first temperature detection components are connected to one first spectrometer 13, and the other two first temperature monitoring components 25 are connected to another first spectrometer 13. The two first spectrometers 13 are connected to the fiber collector 11, and the fiber collector 11 is connected to the demodulator 12.

[0074] In addition, the optical fibers 21 in different temperature monitoring components 2 can transmit signals of different wavelengths. After multiple temperature monitoring components 2 pass through the same first optical splitter 13, they can be connected to the fiber collector 11 through the same optical fiber 21 (such as a pigtail). That is, the same optical fiber 21 can transmit multiple optical signals of different wavelengths, and each wavelength can correspond to the signal of a temperature monitoring component 2. In this way, one optical fiber 21 can carry the data of multiple temperature monitoring components 2, greatly increasing the transmission capacity and meeting the signal transmission requirements of multiple sensors in large-scale temperature monitoring. Moreover, this arrangement effectively improves the utilization rate of the optical fiber 21 and reduces the number of optical fibers 21 used. In practical applications, the cost of laying the optical fiber 21 can be reduced. In addition, the optical signals of each wavelength are independent of each other, and the signal interference between different monitoring components is small. In practical applications, the influence of external factors on the monitoring component signals can be effectively reduced, the reliability of transmission can be improved, and the accuracy and stability of strain monitoring data can be ensured.

[0075] It should be noted that, depending on the number of points that need to be monitored on the battery pack and / or the battery pack bottom plate, the number of temperature monitoring components 2, the number of first spectrometers 13, the number of second spectrometers 14, and the number of gratings 211 in the optical fiber 21 can be selected and adjusted.

[0076] In some embodiments, the signal processing component 1 also includes a processor, which is connected to the demodulator 12. A display screen can be provided inside the vehicle, which is electrically connected to the processor. The demodulator 12 can present the monitoring data on the display screen through the processor, or the user can send a control signal to the processor by clicking on the display screen, and the processor selects to observe the temperature parameters of different positions of the battery pack and / or the battery pack bottom plate according to the control signal.

[0077] Optionally, the spectral range of demodulator 12 is 1530nm-1564nm, and the wavelength spacing of each measurement point (grating 211) is 1.8nm. The distance between the measurement points can be selected and adjusted according to the size of the battery cell. The wavelength tolerance of grating 211 is ±0.2nm, and the grating length is less than 5nm.

[0078] Optionally, the optical fiber 21 may be an acrylic-coated single-mode optical fiber with a diameter of 9 μm and a cladding diameter of 125 μm.

[0079] The present application also provides a vehicle, which includes the above-mentioned battery pack monitoring system.

[0080] In the vehicle provided by the embodiment of the present application, a temperature monitoring component 2 is provided on the battery pack and / or the battery pack bottom plate in the vehicle, and the temperature monitoring component 2 includes an optical fiber 21, and at least one grating 211 is provided inside the optical fiber 21. The grating 211 in the optical fiber 21 is a periodic refractive index distribution structure that can reflect light of a specific wavelength. When the temperature of the battery pack and / or the battery pack bottom plate changes, under the influence of the thermal expansion effect and the thermo-optical effect, the period of the grating 211 and the refractive index of the optical fiber 21 will change. The working effect of the two causes the Bragg wavelength to drift linearly with temperature. The temperature monitoring component 2 is connected to the signal processing component 1, and the signal processing component 1 can process the received signal, such as converting the wavelength drift into a specific strain value, and output the result (for example, to a display screen) for the driver's reference, so as to timely monitor the temperature of the battery pack and / or the battery pack bottom plate, and promptly remind the driver, thereby effectively preventing potential safety risks. In addition, optical fiber 21 needs to be connected to signal processing assembly 1 via connector 22 (e.g., a connector). Connector 22 (e.g., a pigtail) is inherently fragile and easily broken by bending or stretching. The protective member, with its high strength and rigidity, wraps around connector 22 and limits excessive bending, preventing damage or breakage of optical fiber 21 due to mechanical stress and extending the service life of the battery pack monitoring system.

[0081] The present application also provides a method for installing a battery pack monitoring system, the method comprising:

[0082] For each temperature monitoring component 2, use an adhesive to fix the optical fiber 21 to the outer wall of the battery pack or the battery pack bottom plate 100 to fix all the temperature monitoring components 2; use tape to wrap the connectors 22 of all the strain monitoring components 2 and connect them to the fiber outlet holes of the battery pack bottom plate 100; use a sealant to seal the fiber outlet holes and use a fixing member to fix the battery pack bottom plate 100; use a fusion splicer to connect all the connectors 22 to the signal processing component 1.

[0083] It should be noted that the length of optical fiber 21 may vary for each temperature monitoring assembly 2 due to the different monitoring locations. Therefore, after securing the temperature monitoring assembly 2, the optical fiber 21 needs to be cut at the "melting point." Different temperature monitoring assemblies 2 require different lengths of optical fiber 21, and therefore different melting points. As long as there is no redundancy in the cut optical fiber 21, it can be easily connected to the signal processing assembly 1.

[0084] Optionally, the adhesive may be a component with adhesive function such as foam glue.

[0085] Optionally, the step of connecting the optical fiber 21 to the outer side wall of the battery pack or the battery pack bottom plate 100 using an adhesive may include:

[0086] A portion of the temperature monitoring component 2 is fixed to the outer wall of the battery pack using foam glue, specifically, the position where the grating 211 is set in the optical fiber 21 is fixed to the outer wall of the battery pack, and glue is applied between the optical fiber 21 and the outer wall of the battery pack; another portion of the temperature monitoring component 2 is fixed to the battery pack bottom plate 100 using foam glue, specifically, the position where the grating 211 is set in the optical fiber 21 is fixed to the outer wall of the battery pack bottom plate 100, and glue is applied between the optical fiber 21 and the battery pack bottom plate 100.

[0087] Optionally, the sealing member may be a sealant.

[0088] Optionally, the fixing member may be a bolt, a screw, or the like.

[0089] In some embodiments, the signal processing component 1 may include a splitter 13, a fiber collector 11, a demodulator 12, and a processor; characterized in that the steps of connecting all the connectors 22 to the signal processing component 1 using a fusion splicer include:

[0090] All the connectors 22 are connected to different optical splitters 13 in groups of two or four, and each optical splitter 13 is connected to the demodulator 12 through the same fiber collector 11;

[0091] The demodulator 12 is then connected to the processor.

[0092] It should be noted that the temperature monitoring assembly 2 may include a first temperature monitoring component 25 and a second temperature monitoring component 26. The connectors 22 on each of the two first temperature monitoring components 25 are connected to the fiber collector 11 via the first optical splitter 13. The connectors 22 on each of the four second temperature monitoring components 26 are connected to the fiber collector 11 via the second optical splitter 14.

[0093] It should be noted that, in some embodiments, the signal processing component 1 may include a display, which is connected to the processor. Different measuring points can be selected through the display to observe temperature changes at different locations, and reminder and alarm functions can also be added as needed.

[0094] For example, when the temperature of a certain measuring point is greater than a preset value, the processor sends an alarm signal to the display to display an alarm message on the display (in the form of text, screen color change, etc.).

[0095] In some embodiments, the packaging and testing method of the battery pack strain monitoring system is as follows:

[0096] Produce the temperature monitoring component 2 according to the production plan, wipe the connecting part 22 (such as pigtail) of the grating 211 array dust-free with an alcohol cotton cloth, and then insert it into the first protective part 23 (such as a PVC tube) until the position marked on the optical fiber 21 is flush with the tube mouth of the first protective part 23, and then use an adhesive to fix the optical fiber 21, the first protective part 23 and the battery pack or the battery pack bottom plate 100.

[0097] Place the coupled temperature monitoring component 2 in a constant temperature water bath and perform calibration according to the operating manual of the standard strain gauge. At the same time, set the strain program to be tested according to the operating specifications of the constant temperature water bath: the grating of the temperature monitoring component 2 is set at a reference wavelength of 0με, a uniform coefficient is used to detect the strain curve from 0με to 10με, and calibrate 10με.

[0098] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.

[0099] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only.

[0100] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery pack monitoring system, applied to a vehicle, the vehicle comprising a battery pack and a battery pack base plate, the battery pack being arranged on the battery pack base plate, characterized in that: The battery pack monitoring system comprises a signal processing component (1) and at least one temperature monitoring component (2), wherein the at least one temperature monitoring component (2) is arranged on the battery pack and / or the battery pack bottom plate, and the signal processing component (1) is arranged in the vehicle; The signal processing component (1) is connected to the at least one temperature monitoring component (2) and is used to process and display the received signal; The temperature monitoring component (2) comprises an optical fiber (21), a connector (22) and a first protective component (23); the optical fiber (21) is connected to the signal processing component (1) via the connector (22); at least one grating (211) is provided in the optical fiber (21); and the first protective component (23) is sleeved on the connector (22).

2. The battery pack monitoring system according to claim 1, characterized in that: The first protective member (23) has heat insulation performance, and the thermal conductivity of the first protective member (23) is smaller than the thermal conductivity of the optical fiber (21).

3. The battery pack monitoring system according to claim 2, characterized in that: The first protective member (23) is a glass fiber sleeve.

4. The battery pack monitoring system according to claim 1, characterized in that: The optical fiber (21) is any one of a quartz optical fiber (21), a crystal-derived optical fiber (21), and a photonic crystal optical fiber (21).

5. The battery pack monitoring system according to claim 1, characterized in that: The temperature monitoring component (2) further comprises a second protective member (24), which is sleeved on the optical fiber (21), wherein the second protective member (24) is any one of a rubber sleeve, a metal tube and a metal braided mesh.

6. The battery pack monitoring system according to claim 1, characterized in that: There are multiple temperature monitoring components (2), and the multiple temperature monitoring components (2) are respectively connected to the signal processing component (1), wherein multiple gratings (211) are arranged at intervals in the optical fiber (21) in each temperature monitoring component (2), and the optical fibers (21) in the multiple temperature monitoring components (2) are interwoven into a mesh on the battery pack and / or the battery pack bottom plate.

7. The battery pack monitoring system according to claim 6, characterized in that: The plurality of temperature monitoring components (2) include a plurality of first temperature monitoring components (25), and the plurality of first temperature monitoring components (25) are arranged on the outer side wall of the battery pack; The plurality of temperature monitoring assemblies (2) further include a plurality of second temperature monitoring components (26), and the plurality of second temperature monitoring components (26) are arranged on the battery pack bottom plate.

8. The battery pack monitoring system according to claim 7, wherein the battery pack comprises at least two battery groups, each of which comprises a plurality of battery cells, The number of the first temperature monitoring components (25) is the same as the number of battery packs, and the optical fiber (21) in each of the first temperature monitoring components (25) includes a plurality of gratings (211), and the number of the gratings (211) in each of the optical fibers (21) is the same as the number of the battery cells in each of the battery packs.

9. The battery pack monitoring system according to claim 8, characterized in that: The signal processing component (1) comprises a fiber collector (11), a demodulator (12) and a first optical splitter (13), wherein the fiber collector (11) is connected to the demodulator (12); Each of the first temperature monitoring components (25) is connected to the fiber collector (11) via the first optical splitter (13); and / or, The signal processing component (1) further comprises a second optical splitter (14), and each of the second temperature monitoring components (26) is connected to the fiber collector (11) via the second optical splitter (14).

10. A vehicle, characterized in that: The vehicle includes the battery pack monitoring system according to any one of claims 1 to 9.

11. A method for installing the battery pack monitoring system according to any one of claims 1 to 9, characterized in that: The installation method includes: For each of the temperature monitoring components (2), the optical fiber (21) is fixedly connected to the outer wall of the battery pack or the battery pack bottom plate (100) using an adhesive to fix all of the temperature monitoring components (2); Using adhesive tape to wrap the connectors (22) of all the temperature monitoring components (2), and connect them to the fiber outlet holes of the battery pack bottom plate (100); The fiber outlet hole is sealed using a sealing member, and the battery pack bottom plate (100) is fixed using a fixing member; All the connecting parts (22) are connected to the signal processing component (1) using a welding machine.

12. The method for installing a battery pack monitoring system according to claim 11, wherein the signal processing component (1) comprises an optical splitter, a fiber concentrator (11), a demodulator (12) and a processor; characterized in that: The steps of connecting all the connectors (22) to the signal processing component (1) using a welding machine include: All the connecting members (22) are connected to different optical splitters in groups of two or four, and each optical splitter is connected to the demodulator (12) through the same fiber collector (11); The demodulator (12) is then connected to the processor.

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