Battery internal parameter monitoring device and battery

Abstract

The application discloses a kind of battery internal parameter monitoring device and battery, it is related to battery technical field, the device includes: sensing module, set in battery interior, for real-time acquisition battery internal battery parameter, and output sensing signal of characterizing battery parameter;Corrosion-resistant signal line is connected with sensing module, and it is extended to the outside of battery by passing through battery cover plate, for transmission sensing signal;Sealing structure is arranged between corrosion-resistant signal line and battery cover plate, for realizing the sealing between corrosion-resistant signal line and battery cover plate.The application is by setting sealing structure on battery cover plate, and make corrosion-resistant signal line pass through sealing structure and lead to the outside of battery, and then make corrosion-resistant signal line real-time transmission battery internal parameter collected by sensing module to the outside of battery, real-time monitoring and management to the internal state of battery are realized, improve the safety and reliability of battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery internal parameter monitoring device and a battery. Background Technology

[0002] With the development of new energy technologies, lithium-ion batteries, lead-acid batteries, and other types of batteries are widely used in electric vehicles, energy storage power stations, portable electronic devices, and many other fields. The safety, reliability, and real-time monitoring of battery operating status have become crucial factors in ensuring stable system operation. Especially in high-power applications such as electric vehicles and energy storage systems, abnormal changes in key parameters such as internal battery temperature, pressure, and gas concentration can easily trigger safety accidents such as thermal runaway, bulging, and leakage.

[0003] Currently, existing technologies for monitoring battery operating status mainly rely on external sensors or estimations based on external parameters such as voltage and current collected from the battery pack. This approach cannot directly and accurately reflect the true physical and chemical state inside the battery, and its early warning capability for internal anomalies is limited. Furthermore, some solutions attempt to place sensors inside the battery; however, due to the complex internal environment and the presence of corrosive electrolytes, sensor signal lines are susceptible to corrosion or poor sealing, leading to electrolyte leakage and the entry of external impurities, thus affecting battery safety and lifespan.

[0004] Therefore, there is an urgent need for a device and its implementation method that can achieve real-time and accurate monitoring of battery internal parameters while ensuring sealing and corrosion resistance, so as to improve battery safety management, extend battery life, and provide basic data support for intelligent battery management.

[0005] The information disclosed in this background section is included only to enhance the understanding of the context of this disclosure, and therefore may contain information that does not constitute relevant technology currently known to those skilled in the art. Utility Model Content

[0006] This application provides a battery internal parameter monitoring device and a battery to solve the problem that the prior art cannot accurately monitor key internal parameters of the battery.

[0007] The technical solution adopted in this application is as follows:

[0008] In a first aspect, this application provides a battery internal parameter monitoring device, comprising:

[0009] The sensing module, located inside the battery, is used to collect battery parameters inside the battery in real time and output sensing signals that characterize the battery parameters.

[0010] A corrosion-resistant signal line connects to the sensing module and extends through the battery cover to the outside of the battery to transmit sensing signals.

[0011] A sealing structure is installed between the corrosion-resistant signal line and the battery cover to achieve a seal between the corrosion-resistant signal line and the battery cover.

[0012] This application achieves real-time and accurate monitoring of internal battery parameters while ensuring battery sealing and corrosion resistance by setting a sensing module inside the battery and using corrosion-resistant signal lines and a sealed structure.

[0013] In conjunction with the first aspect, in one alternative implementation, the sealing structure includes:

[0014] The insert includes a lower section extending to the inside of the battery cover and an upper section extending to the outside of the battery cover. Both the upper and lower sections are provided with axially penetrating channels for corrosion-resistant signal lines to pass through.

[0015] The connecting sleeve is sealed and installed on the battery cover plate, and is fitted onto the upper and lower sections.

[0016] This application, by setting a combination structure of insert and connecting sleeve in the sealed structure, enables corrosion-resistant signal lines to pass through the battery cover more stably and reliably, while effectively enhancing sealing performance and corrosion resistance. This achieves efficient transmission of internal battery parameter signals, further ensuring the overall sealing and safety of the battery, helping to extend battery life and improve the accuracy of monitoring data.

[0017] In conjunction with the first aspect, in one optional implementation, a first protrusion is formed on the side wall of the upper section in a radial direction, and a second protrusion is formed on the side wall of the lower section in a radial direction, with the two ends of the connecting sleeve abutting against the first protrusion and the second protrusion, respectively.

[0018] This application achieves axial positioning and secure installation of the connecting sleeve by providing a first protrusion and a second protrusion on the upper and lower side walls of the insert, respectively, and by having both ends of the connecting sleeve abut against these two protrusions. This structure effectively prevents axial displacement of the sealing structure due to external forces or thermal expansion and contraction, further improving the sealing reliability and structural stability of the signal line exit point. This enables continuous and reliable monitoring of the battery's internal parameters, enhancing the device's safety and durability.

[0019] In conjunction with the first aspect, in one alternative implementation, the battery cover has a connection hole for the insert to pass through, and the sealing structure further includes:

[0020] The adapter extends from the inside of the battery cover through the connection hole to the outside of the battery cover, and the adapter has a through channel that allows for unobstructed vertical movement.

[0021] A pressure plate is positioned above the adapter and covers the through channel. The pressure plate has mounting holes for inserting the connecting sleeve.

[0022] The threaded sleeve mates with the adapter's threads. The bottom of the threaded sleeve abuts against the battery cover, and the top of the threaded sleeve presses against the pressure plate to press the pressure plate firmly onto the adapter.

[0023] This application achieves reliable sealing and stable installation of the signal line exit point by setting an adapter with a through channel on the battery cover and fixing it with a pressure plate and a threaded sleeve, which effectively improves the sealing performance and structural strength, and ensures the safety and reliability of the battery in complex environments.

[0024] In conjunction with the first aspect, in one alternative implementation, the sealing structure further includes:

[0025] An insulating protective sleeve is fitted onto the end of the upper section away from the lower section to achieve insulation and protection. The insulating protective sleeve has an axially penetrating channel that matches the outer diameter of the corrosion-resistant signal line. The corrosion-resistant signal line passes through the channel and extends to the outside of the battery.

[0026] A sealing compound is placed between the adapter and the battery cover to achieve a sealed fit between the two.

[0027] This application achieves insulation protection for the signal line exiting the battery and effective sealing between the adapter and the battery cover by setting an insulating protective sleeve and a sealing colloid between the adapter and the battery cover, thereby improving the overall sealing performance and safety of the battery.

[0028] In conjunction with the first aspect, in one alternative implementation, the ferrule is a ceramic ferrule with a diameter ranging from 0.5 to 2 mm.

[0029] This application achieves good high-temperature resistance and insulation performance of the signal line by using ceramic ferrules with a diameter of 0.5 to 2 mm, thereby improving the safety and reliability of the structure.

[0030] In conjunction with the first aspect, in one alternative implementation, the corrosion-resistant signal line includes at least one optical fiber.

[0031] This application improves the electromagnetic interference resistance and data transmission efficiency during signal transmission by selecting at least one optical fiber as a corrosion-resistant signal line.

[0032] In conjunction with the first aspect, in one alternative implementation, the sensing module includes:

[0033] A temperature sensor, located on the surface of the battery core, includes multiple fiber gratings with different center wavelengths, used to output temperature sensing signals characterizing multiple locations inside the battery.

[0034] And / or, strain sensors, including pre-stretched fiber Bragg gratings, are disposed in the central region of the battery core and the side R-corner region of the battery core, for outputting sensing signals characterizing strain changes at multiple locations inside the battery.

[0035] This application achieves precise distributed monitoring of temperature and strain at multiple locations inside the battery by setting multiple fiber Bragg grating temperature sensors and / or pre-stretched fiber Bragg grating strain sensors with different center wavelengths in the sensing module, thereby improving battery safety and operational status perception capabilities.

[0036] In conjunction with the first aspect, in one alternative implementation, the sensing module further includes:

[0037] A temperature compensation sensor, positioned adjacent to the strain sensor, includes an unstretched fiber Bragg grating to eliminate the effects of temperature interference on the strain sensor.

[0038] This application improves the accuracy and reliability of strain measurement by setting a temperature compensation sensor close to the strain sensor in the sensing module and using a fiber optic grating without pre-stretching.

[0039] Secondly, this application also provides a battery. The battery includes a battery casing and a battery internal parameter monitoring device as described in the first aspect or any optional implementation of the first aspect, wherein the battery casing includes a battery cover.

[0040] This application integrates a battery internal parameter monitoring device into the battery, enabling real-time and accurate monitoring of key parameters such as battery internal temperature and pressure. This helps to promptly detect abnormal conditions during battery operation and improves the safety and reliability of battery operation.

[0041] For more detailed information on battery implementation, please refer to the description of any of the implementation methods in the first aspect above.

[0042] Based on the implementation methods provided in the above aspects, this application can be further combined to provide more implementation methods.

[0043] Other advantages, objectives and features of this application will be partly apparent from the description below, and partly understood by those skilled in the art through study and practice of this application. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below only show some embodiments of this application. For those skilled in the art, other implementation methods can be derived from the structures shown in these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of a battery internal parameter monitoring device provided in an embodiment of this application;

[0046] Figure 2 This is a schematic diagram of a sealing structure provided in an embodiment of this application;

[0047] Figure 3 This is an exploded structural diagram of a sealing structure provided in an embodiment of this application. Detailed Implementation

[0048] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0049] The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. In this application, "at least one" means one or more, and "more than one" means two or more. The terms "first," "second," and other ordinal terms used in this application may be used to describe various constituent elements, but these constituent elements are not limited by these terms. The purpose of using these terms is solely to distinguish one constituent element from others and should not be construed as indicating or implying relative importance. For example, without departing from the scope of this application, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element.

[0050] Each circuit or other component may be described or referred to as "for" performing one or more tasks. In this context, "for" is used to imply a structure by indicating that the circuit / component includes a structure (e.g., a circuit system) that performs one or more tasks during operation. Therefore, even when the specified circuit / component is currently inoperable (e.g., not turned on), it can still be referred to as "for performing that task." Circuits / components used with the term "for" include hardware, such as circuits that perform operations.

[0051] Before introducing the embodiments of this application, the background technology involved in this application will be introduced first.

[0052] With the continuous advancement of the new energy industry, various types of batteries, such as lithium-ion batteries and lead-acid batteries, have been widely used in electric vehicles, energy storage systems, and various portable electronic products. The safety, reliability, and real-time monitoring of battery operating status have become crucial for ensuring the stability and safety of application systems. Especially in high-power scenarios such as electric vehicles and large-scale energy storage, abnormal changes in critical parameters such as internal battery temperature, pressure, and gas concentration can easily lead to safety hazards such as thermal runaway, expansion, or leakage.

[0053] Currently, most mainstream technologies indirectly assess battery operating status by using external sensors or collecting parameters such as external voltage and current of the battery pack. These methods cannot directly and accurately reflect the actual physical and chemical changes inside the battery, and their ability to quickly warn of internal anomalies is weak. While some existing solutions attempt to integrate sensors directly into the battery, the complex internal environment and corrosive electrolyte make sensor leads susceptible to corrosion or sealing failure, leading to electrolyte leakage, impurity intrusion, and ultimately affecting battery safety and lifespan.

[0054] Therefore, there is an urgent need to develop a battery internal parameter monitoring solution that combines sealing and corrosion resistance to achieve real-time and accurate detection of key internal parameters, thereby improving battery safety management and intelligence, and extending battery life.

[0055] In summary, existing technologies have limitations in enabling real-time and accurate monitoring of critical parameters inside the battery (such as temperature, pressure, and gas concentration), and sensor placement can easily lead to reduced battery sealing and safety.

[0056] To address the aforementioned issues, this application provides a battery internal parameter monitoring device and a battery, which can solve the problem that condensation easily occurs inside the battery pack in existing solutions, leading to safety hazards such as corrosion of electrical components and electrical short circuits.

[0057] refer to Figure 1 , Figure 1 A schematic diagram of the structure of a battery internal parameter monitoring device provided in an embodiment of this application is shown.

[0058] like Figure 1As shown, the battery internal parameter monitoring device includes a sensing module 101 disposed inside the battery, a corrosion-resistant signal line 102, and a sealing structure 103 disposed between the corrosion-resistant signal line 102 and the battery cover. The sensing module 101 is used to collect battery parameters inside the battery in real time and output sensing signals characterizing these parameters. The corrosion-resistant signal line 102 is connected to the sensing module 101 and extends through the sealing structure 103 to the outside of the battery, transmitting the sensing signals output by the sensing module 101 to a processing module outside the battery. The sealing structure 103 is used to seal the corrosion-resistant signal line 102 between it and the battery cover. For example, a temperature sensor is installed on the lithium battery cover, and its signal line is led out to the outside of the battery through the sealing structure. To prevent battery leakage, the signal line is sealed through the sealing structure as it passes through the battery cover, thus transmitting the internal temperature of the battery while ensuring that the battery does not leak or allow air to enter.

[0059] refer to Figure 2-3 , Figure 2 This illustration shows a structural schematic diagram of a sealing structure 103 provided in an embodiment of this application. Figure 3 An exploded view of a sealing structure 103 provided in an embodiment of this application is shown.

[0060] In some embodiments, the sealing structure 103 includes a core 201 and a connecting sleeve 202. The core 201 is divided into two cylindrical sections, upper and lower, with the lower section 2012 extending into the battery cover and the upper section 2011 extending out of the battery cover, their axial ends meeting. The core 201 has an axial through hole 2013 inside for the corrosion-resistant signal line 102 to pass through. The connecting sleeve 202 is sealed to the battery cover and can be a cylindrical sleeve with an inner cavity 2021 to tightly wrap the outer surfaces of the upper section 2011 and the lower section 2012 of the core 201. This design effectively prevents liquid or gas leakage from the battery while ensuring the corrosion-resistant signal line 102 can be smoothly led out.

[0061] In some embodiments, the upper section 2011 of the insert 201 protrudes outward to form a first protrusion 20110, and the lower section 2012 also protrudes outward to form a second protrusion 20120. The two ends of the connecting sleeve 202 abut against the first and second protrusions 20120, respectively. In this way, the connecting sleeve 202 can be more securely fixed between the upper and lower sections of the insert 201, preventing the sealing structure 103 from loosening or shifting.

[0062] For example, when installing temperature sensor leads on the cover of a lithium battery, in order to improve the stability of the sealing structure 103, the upper and lower ends of the insert 201 are made into raised "steps". The two ends of the connecting sleeve 202 are stuck between these two steps. In this way, even if the corrosion-resistant signal line 102 is pulled by external force or the battery is vibrated, the sealing structure 103 will not loosen, thereby ensuring the battery's sealing and safety.

[0063] In some embodiments, to achieve a secure connection and reliable seal between the insert 201 and the battery cover, a connection hole for the insert 201 to pass through is provided on the battery cover. The sealing structure 103 includes an adapter 203, a pressure plate 204, and a threaded sleeve 205. The adapter 203 passes through the connection hole from the inside of the battery cover and extends to the outside, including a cylindrical adapter body 2031 and an annular adapter edge 2032 extending radially outward from the bottom edge of the adapter body 2031. The adapter edge 2032 is located below the battery cover and abuts against the battery cover. The adapter body 2031 has a through channel that allows for easy passage of components such as the corrosion-resistant signal line 102. The pressure plate 204... The plate is circular, with a radial dimension matching the outer diameter of the adapter body 2031. It is positioned above the adapter 203 and covers the through channel. The pressure plate 204 has mounting holes 2041 for inserting the connecting sleeve 202. The threaded sleeve 205 is threaded into the adapter 203, with its bottom abutting against the battery cover, thus clamping the battery cover with the adapter edge 2032. This fixes the sealing structure 103 to the battery cover. The top edge of the threaded sleeve 205 extends radially inward to form an annular inner flange 2051, which can be used to press the pressure plate 204. By tightening the threaded sleeve 205, the pressure plate 204 can be firmly pressed onto the adapter 203, thereby achieving the fastening and sealing of the insert 201 structure. This not only improves the reliability and sealing of the connection but also facilitates assembly and subsequent maintenance, effectively preventing internal battery leakage and ensuring the safe operation of the battery system.

[0064] For example, in a battery temperature acquisition device, the temperature signal line needs to be sealed and led out of the battery. During installation, first, the adapter 203 is passed through the connecting hole on the battery cover. Then, the pressure plate 204 is placed above the adapter 203, aligning the mounting hole 2041 of the pressure plate 204 and inserting the connecting sleeve 202. Finally, the threaded sleeve 205 is tightened onto the adapter 203, so that the bottom of the threaded sleeve 205 abuts against the cover and the top presses the pressure plate 204 onto the adapter 203. This ensures the sealing and secure connection of the ferrule 201 and the signal line, while facilitating subsequent disassembly and maintenance, significantly improving the reliability and safety of the structure.

[0065] In some embodiments, to further enhance the safety and reliability of the sealing structure 103, the sealing structure 103 may further include an insulating protective sleeve 206 and a sealing compound. The insulating protective sleeve 206 is installed at the end of the upper section 2011 of the insert 201 away from the lower section 2012. It may be a tapered plastic sleeve with an axial channel 2061 inside that matches the outer diameter of the corrosion-resistant signal line 102. That is, the top of the tapered plastic sleeve has a wire hole for the corrosion-resistant signal line 102 to pass through, allowing the corrosion-resistant signal line 102 to pass through and be effectively covered, achieving insulation and external physical protection for the corrosion-resistant signal line 102. The sealing compound is filled between the adapter 203 and the battery cover to enhance sealing performance, prevent leakage of electrolyte or other media, and further improve the sealing and safety of the entire structure.

[0066] For example, in battery temperature acquisition applications, signal lines need to be stably led out from inside the battery over a long period. To prevent damage to the signal lines from the external environment, an insulating protective sleeve 206 is added to the outer end of the upper section 2011 of the connector 201. The signal lines are led out through small holes in the protective sleeve, which not only prevents short circuits but also avoids pulling damage. At the same time, sealant is applied or filled at the mounting interface between the sealing structure 103 and the cover plate to ensure that there is no leakage even in high temperature and high humidity environments, effectively improving the safety and durability of the battery system.

[0067] In some embodiments, the ferrule 201 is made of ceramic material and its diameter ranges from 0.5 to 2 mm. This means that the ferrule 201 not only has good insulation properties and advantages such as high temperature resistance and corrosion resistance, but also allows for the selection of appropriate sizes according to different application requirements. For example, in the sealing connection of precision electronic devices, a ceramic ferrule 201 with a diameter of 0.8 mm can be selected to achieve a compact layout and excellent electrical isolation effect, thereby improving the safety and stability of the overall system.

[0068] In some embodiments, the corrosion-resistant signal line 102 can be not only a traditional metal conductor, but may also include at least one optical fiber. This design leverages the excellent corrosion resistance and electromagnetic interference immunity of optical fiber itself, thereby improving the reliability of signal transmission. For example, in industrial automation equipment operating in highly corrosive environments, using a corrosion-resistant signal line 102 containing optical fiber can ensure the long-term stability and security of data transmission, effectively avoiding signal attenuation or failures caused by metal corrosion.

[0069] It should be noted that the number of ferrules 201 can be one or more, which is consistent with the number of corrosion-resistant signal lines 102. For example, when the corrosion-resistant signal lines 102 include two optical fibers, the sealing structure 103 includes two ceramic ferrules 201.

[0070] In some embodiments, the sensing module 101 may include a temperature sensor and / or a strain sensor. For example, the temperature sensor is disposed on the surface of the battery core and integrates multiple fiber Bragg gratings with different center wavelengths. These fiber Bragg gratings can sense and output temperature signals from multiple locations inside the battery, enabling precise monitoring of the battery's operating status. Simultaneously, the sensing module 101 may also include a strain sensor installed in the central region and the side R-corner region of the battery core. This strain sensor is composed of pre-stretched fiber Bragg gratings and is used to output strain change signals from different regions inside the battery in real time. For instance, during battery charging and discharging, the sensing module 101 can simultaneously acquire temperature and strain change information from multiple points on the battery, providing data support for battery safety management and performance optimization.

[0071] It should be noted that the temperature sensor is placed on the surface of the battery core because the surface area is most susceptible to the influence of the external environment and operating conditions, and can reflect the overall temperature changes of the battery in a timely manner; while the strain sensor is installed in the central area and the side R-corner area of ​​the battery core because these parts are most prone to stress concentration and deformation during charging and discharging, which can effectively monitor the internal structural safety status of the battery, thereby achieving accurate monitoring and early warning of battery operating safety.

[0072] In some embodiments, the sensing module 101 further includes a temperature compensation sensor disposed adjacent to the strain sensor and employing an unstretched fiber Bragg grating structure. The function of this temperature compensation sensor is to eliminate measurement errors caused by changes in ambient temperature during actual operation of the strain sensor. For example, when the ambient temperature of the battery's operating environment rises, a conventional strain sensor will not only sense mechanical strain but also be affected by thermal expansion, leading to errors. However, by using it in conjunction with the temperature compensation sensor, the interference of temperature changes on strain measurement can be effectively distinguished and offset, thereby obtaining more accurate strain data and improving the reliability and accuracy of the system.

[0073] It should be noted that the strain sensor uses a pre-stretched fiber Bragg grating to enable it to sensitively sense and measure minute external strain changes, thereby improving the accuracy of the strain response. On the other hand, the temperature compensation sensor uses an unstretched fiber Bragg grating to avoid responding to mechanical strain and to be sensitive only to changes in ambient temperature. This effectively separates and compensates for temperature and strain signals, improving the accuracy and reliability of the measurement.

[0074] Based on the same technical concept, this application also provides a battery, which includes a battery casing and the battery internal parameter monitoring device in any of the above embodiments, wherein the battery casing includes a battery cover. By integrating the battery internal parameter monitoring device within the battery casing, key parameters such as internal strain and temperature of the battery can be monitored in real time during operation. For example, during charging and discharging, stress changes may occur due to thermal expansion and contraction or internal chemical reactions. The aforementioned monitoring device can detect abnormalities in a timely manner, helping to improve battery safety and lifespan. The design of the battery cover also facilitates the placement and maintenance of sensors, thereby achieving efficient and accurate monitoring of the battery's internal state.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application and in its specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0076] It should be noted that, unless otherwise specified, the term "connected" or "linked" in this application includes not only directly connecting two entities, but also indirectly connecting them through other entities that have beneficial improvement effects.

[0077] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many forms under the guidance of this application without departing from the spirit and scope of protection of the claims. All equivalent transformations made under the inventive concept of this application using the content of this application's specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery internal parameter monitoring device, characterized in that, include: The sensing module, located inside the battery, is used to collect battery parameters inside the battery in real time and output sensing signals that characterize the battery parameters. A corrosion-resistant signal line is connected to the sensing module and extends through the battery cover to the outside of the battery to transmit the sensing signal. A sealing structure is provided between the corrosion-resistant signal line and the battery cover to achieve a seal between the corrosion-resistant signal line and the battery cover.

2. The battery internal parameter monitoring device according to claim 1, characterized in that, The sealing structure includes: The insert includes a lower section extending to the inside of the battery cover and an upper section extending to the outside of the battery cover, both the upper and lower sections having axially penetrating channels for the corrosion-resistant signal lines to pass through. A connecting sleeve is sealed and installed on the battery cover plate and fitted over the upper and lower sections.

3. The battery internal parameter monitoring device according to claim 2, characterized in that, A first protrusion is formed on the side wall of the upper section in the radial direction, and a second protrusion is formed on the side wall of the lower section in the radial direction. The two ends of the connecting sleeve abut against the first protrusion and the second protrusion, respectively.

4. The battery internal parameter monitoring device according to claim 3, characterized in that, The battery cover has a connection hole for the insert to pass through, and the sealing structure further includes: An adapter extends from the inside of the battery cover through the connection hole to the outside of the battery cover, and the adapter has a through channel that allows for unobstructed vertical movement. A pressure plate is disposed above the adapter and covers the through channel, and the pressure plate has mounting holes for inserting the connecting sleeve; A threaded sleeve is threadedly engaged with the adapter. The bottom of the threaded sleeve abuts against the battery cover, and the top of the threaded sleeve presses against the pressure plate to press the pressure plate tightly onto the adapter.

5. The battery internal parameter monitoring device according to claim 4, characterized in that, The sealing structure further includes: An insulating protective sleeve is fitted onto the end of the upper section away from the lower section to achieve insulation and protection. The insulating protective sleeve has an axially penetrating channel that matches the outer diameter of the corrosion-resistant signal line. The corrosion-resistant signal line passes through the channel and extends to the outside of the battery. A sealing colloid is disposed between the adapter and the battery cover to achieve a sealed fit between the two.

6. The battery internal parameter monitoring device according to claim 2, characterized in that, The insert is a ceramic insert, and the diameter of the insert ranges from 0.5 to 2 mm.

7. The battery internal parameter monitoring device according to claim 1, characterized in that, The corrosion-resistant signal line includes at least one optical fiber.

8. The battery internal parameter monitoring device according to claim 1, characterized in that, The sensing module includes: A temperature sensor, located on the surface of the battery core, includes multiple fiber gratings with different center wavelengths, used to output temperature sensing signals characterizing multiple locations inside the battery. And / or, strain sensors, disposed in the central region of the battery core and the side R-corner region of the battery core, including a pre-stretched fiber optic grating, are used to output sensing signals characterizing strain changes at multiple locations inside the battery.

9. The battery internal parameter monitoring device according to claim 8, characterized in that, The sensing module also includes: A temperature compensation sensor, disposed adjacent to the strain sensor, includes an unstretched fiber Bragg grating for eliminating the influence of temperature interference on the strain sensor.

10. A battery, characterized in that, include: A battery casing, the battery casing including a battery cover plate; The battery internal parameter monitoring device as described in any one of claims 1-9.

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