A battery electrolyte leakage detection system

Abstract

The utility model discloses a battery electrolyte leakage detection system, lithium battery package side wall board is equipped with detector mounting plate. The base plate of integrated detector is fixed with detector mounting plate. The base plate is connected with the protection cylinder, and the protection cylinder has the protection end plate with the end plate air hole at the other end. The detector circuit board is arranged in the protection cylinder, and the carbonic acid ester gas sensor, VOC gas sensor, pressure sensor, humidity sensor and buzzer are respectively installed on the detector circuit board. Adopt integrated detector, integrate multiple types sensor, multiple parameter detection, through detecting the change of carbonic acid ester gas, VOC gas, pressure and humidity parameter, according to the response type and response degree of sensor, comprehensive judgment, achieve quick response, all -round detection lithium battery electrolyte leakage situation. When the failure of a certain sensor, the rest sensor still works normally, can better ensure accuracy, avoid the leakage or misjudgment.

Description

Technical Field

[0001] This utility model relates to a lithium battery leakage detection system. Background Technology

[0002] The basic working principle of lithium batteries is based on the movement of lithium ions between the positive and negative electrodes to achieve charging and discharging. Compared with traditional batteries, lithium batteries have advantages such as high energy density, high operating voltage, small size, light weight, low self-discharge, no memory effect, long cycle life, and fast charging. Furthermore, because they do not contain heavy metals such as lead and cadmium, and are pollution-free and free of toxic materials, lithium batteries are considered a green new energy product. Lithium batteries are currently widely used in new energy vehicles, 3C products, electric bicycles, power tools, and energy storage power stations. The electrolyte in lithium batteries is a volatile organic liquid containing toxic and harmful substances such as propylene glycol, and is highly corrosive. If the electrolyte leaks, it can cause irritation and damage to the human body. If not detected and dealt with promptly, when the electrolyte enters water sources and soil, it will pollute the environment, affect the ecological balance, and pose potential harm to human and animal health.

[0003] In existing technologies, the detection of electrolyte leakage in lithium batteries is mostly done using test strips, VOC detection, or pressure detection. The main disadvantages of test strip detection are: (1) Low sensitivity. Test strip leakage detection usually relies on the sensitivity of the test strip to specific substances, such as the acidity or alkalinity of the electrolyte. If the sensitivity of the test strip is not high, it may lead to inaccurate detection results or missed detection. (2) Reliance on manual judgment. After the test strip detects leakage, it is usually necessary to manually observe the color change or other reactions of the test strip to determine whether leakage exists. This manual judgment may be affected by subjective factors, leading to inconsistent results. (3) Limitations on the storage and use conditions of the test strip. The storage and use conditions of the test strip have a great impact on its performance. If the test strip is not stored properly or is contaminated during use, it may lead to inaccurate detection results. (4) Limited applicability of the test strip. Test strip leakage detection is usually applicable to certain specific liquids or chemicals. For other types of liquids or chemicals, the test strip may not provide accurate detection results. Among them, VOC gas detectors have poor reliability in detecting battery electrolyte leaks and generally suffer from the following defects: they are greatly affected by ambient gases, are easily interfered with, and produce false alarms. The main disadvantages of pressure detection are: (1) Highly affected by temperature. The pressure inside the tested container is greatly affected by temperature. When it is necessary to accurately measure the leak rate, temperature compensation or control must be performed on the measurement results, otherwise the measurement results may be inaccurate. (2) Dependent on pressure. Pressure leak detectors need to apply a certain pressure to detect leaks in the system. If the system cannot withstand the required pressure, or the pressure is too high, it may cause damage to the system or the leak may not be detected. (3) Surface detection only. Pressure leak detectors can usually only detect leaks on the surface of the system. They may not be able to effectively detect leaks hidden inside or in complex structures. (4) Detection limitations. Certain types of leaks (such as micro-cracks or slow leaks) may be difficult to detect by pressure leak detectors because they do not cause significant pressure changes. (5) System complexity. Some pressure testing methods, such as the vacuum pressure method, have relatively complex leak detection systems. They require the design of a vacuum sealing chamber based on the volume and shape of the product being tested, and the assurance that there are no leaks at the inflation pipe interfaces or the adoption of special structural designs during the leak detection process.

[0004] On the other hand, most systems currently on the market for detecting lithium battery electrolyte leaks use different types of single-function detectors. Single-function detectors are prone to malfunction, false alarms, and missed alarms, making it difficult to detect electrolyte leaks in a timely manner. Moreover, lithium battery electrolyte leaks often produce different characteristic phenomena, and these single-function detectors cannot respond quickly enough, so the reliability of lithium battery electrolyte leak detection is unsatisfactory. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a battery electrolyte leakage detection system that integrates multiple sensors to achieve multi-parameter detection, thereby improving detection accuracy and avoiding missed or false detections.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A battery electrolyte leakage detection system includes a lithium battery pack with sidewalls serving as a housing assembly. A detector mounting plate is mounted on one of the sidewalls. The detection system further includes an integrated detector located inside the lithium battery pack and fixedly mounted on the detector mounting plate. The integrated detector includes a base plate fixed to the detector mounting plate. A protective cylinder is connected to the base plate, with one end fixed to the base plate via a second connecting plate and the other end having a protective end plate. The protective end plate has several end plate vents. A detector circuit board is disposed inside the protective cylinder. A carbonate gas sensor, a VOC gas sensor, a pressure sensor, a humidity sensor, and a buzzer are respectively mounted on the detector circuit board.

[0008] As a further improvement to this detection system, the protective cylinder has several ventilation holes on its wall.

[0009] As a further improvement to this detection system, a first connecting plate is fixedly connected to the side of the substrate. The first connecting plate has bolt holes, and the substrate is fixed to the detector mounting plate by connecting bolts passing through the bolt holes.

[0010] As a further improvement to this detection system, the second connecting plate is provided with bolt holes, and the protective cylinder is fixed to the base plate by connecting bolts passing through the bolt holes.

[0011] As a further improvement to this detection system, an indicator light is also installed on the detector circuit board; correspondingly, an indicator light hole is also provided on the protective end plate; the indicator light protrudes from the indicator light hole.

[0012] As a further improvement to this detection system, the detection system also includes a control host and a terminal monitoring platform; the control host is located outside the lithium battery pack and is connected to the integrated detector via a wiring harness to achieve wired communication; the control host and the terminal monitoring platform are wirelessly connected.

[0013] The positive effects of this utility model are as follows:

[0014] (1) An integrated detector is adopted, which integrates multiple types of sensors and multiple parameters. By detecting changes in parameters such as carbonate gases, VOC gases, pressure and humidity, the detector makes a comprehensive judgment based on the response type and response degree of the sensors, so as to achieve rapid response and comprehensive detection of lithium battery electrolyte leakage. When one sensor fails, the other sensors continue to work normally, which can better ensure accuracy and avoid missed or false detections.

[0015] (2) The detector is installed inside the battery pack and can detect the situation inside the battery pack in real time. Through different sensors, it can detect in a targeted manner and make a comprehensive judgment on the leakage of electrolyte in the battery.

[0016] (3) The detector and the control host use wired communication, which can better prevent signal interference and output the detector's data and status in real time and accurately. The control host and the terminal monitoring platform use wireless communication, which is convenient to use, reduces the complexity of the wiring harness, and further improves the convenience and safety of use by monitoring the working status of the control host in real time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the appearance of the lithium battery pack in an embodiment of this utility model.

[0018] Figure 2 This is a front structural diagram of the integrated detector in an embodiment of this utility model.

[0019] Figure 3 This is a side view of the integrated detector in an embodiment of the present invention, omitting the first connecting plate.

[0020] Figure 4 This is a schematic diagram of the internal structure of the integrated detector in an embodiment of this utility model. To show the internal structure of the integrated detector, the protective cylinder and the protective end plate are omitted in this figure.

[0021] Figure label:

[0022] 1. Detector mounting plate; 2. First socket; 3. Second socket; 4. Base plate; 5. First connecting plate; 6. Protective end plate; 6-1. Vent area of ​​end plate; 6-2. Indicator light hole; 7. Second connecting plate; 8. Protective cylinder; 8-1. Vent hole of cylinder; 9. Detector circuit board; 10. Carbonate gas sensor; 11. VOC gas sensor; 12. Pressure sensor; 13. Humidity sensor; 14. Buzzer; 15. Indicator light. Detailed Implementation

[0023] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0024] An embodiment of this utility model's battery electrolyte leakage detection system includes a lithium battery pack. The lithium battery pack is located inside the lithium battery compartment and is used to house the lithium batteries. For example... Figure 1 As shown, the lithium battery pack has a side wall panel as a housing assembly, one of which is equipped with a detector mounting plate 1, and the side wall panel is also equipped with a first socket 2 and a second socket 3.

[0025] This embodiment also includes an integrated detector fixedly installed inside the detector mounting plate 1 (inside the lithium battery pack). For example... Figure 2 and Figure 3 The integrated detector includes a base plate 4 whose inner side is fixed to the detector mounting plate 1. Specifically, four first connecting plates 5 are evenly distributed around the side of the base plate 4. Each first connecting plate 5 has bolt holes, through which connecting bolts pass to fix the base plate 4 to the detector mounting plate 1. A BMS circuit board is also mounted on the inner side of the detector mounting plate 1. The integrated detector and the BMS circuit board are connected to the first socket 2 and the second socket 3 respectively via signal lines.

[0026] A protective cylinder 8 is provided on the outer side of the base plate 4. The inner end of the protective cylinder 8 is fixed to the base plate 4 by a second connecting plate 7, and the outer end has a protective end plate 6. The protective end plate 6 has an end plate vent area 6-1, and the end plate vent area 6-1 has a plurality of end plate vent holes. Specifically, the second connecting plate 7 has bolt holes, and the protective cylinder 8 is fixed to the base plate 4 by connecting bolts passing through the bolt holes.

[0027] Furthermore, the protective cylinder 8 has several ventilation holes 8-1 on its cylinder wall.

[0028] A detector circuit board 9 is disposed inside the protective cylinder 8. The detector circuit board 9 is generally fixed to the outside of the base plate 4 and covered by the protective cylinder 8. Figure 4 The detector circuit board 9 is equipped with a carbonate gas sensor 10, a VOC gas sensor 11, a pressure sensor 12, a humidity sensor 13, and a buzzer 14.

[0029] Furthermore, an indicator light 15 is also installed on the detector circuit board 9, and correspondingly, an indicator light hole 6-2 is provided on the protective end plate 6. The indicator light 15 protrudes from the indicator light hole 6-2. Since the integrated detector is located inside the lithium battery pack, the indicator light 15 is only visible during maintenance.

[0030] This embodiment further includes a control host and a terminal monitoring platform. The control host is located outside the lithium battery pack and is connected to the integrated detector via a wiring harness to achieve wired communication. The control host and the terminal monitoring platform are wirelessly connected, and the terminal monitoring platform monitors the status of the control host in real time via wireless communication.

[0031] A signal processor is also installed on the detector circuit board 9. The wiring harness is used to transmit the data collected by the integrated detector and processed by the signal processor to the control host via wired communication. The detector circuit board 9 is also connected to a power module located inside the protective cylinder 8. The power module is externally powered and is responsible for providing the necessary power for the operation of the detector.

[0032] The signal processor and communication module together form the control module. The control module is responsible for data processing and storage, signal reception and transmission, execution of control commands, and communication and collaboration with other system components. The signal processor receives the raw signals acquired by the integrated detector and performs amplification, filtering, and digitization processing for subsequent data analysis and application. The signal processor includes components such as an analog-to-digital converter (ADC) and a microprocessor. The communication module is responsible for sending the collected and processed data to an external control host.

[0033] During use, various sensors are in real-time monitoring mode. Thresholds are set according to the environmental conditions inside the battery pack. The built-in algorithm of the control module can distinguish between normal state and battery leakage state through the detection values ​​of each sensor. When the concentration values ​​of carbonate gas, VOC gas, pressure inside the battery pack, and humidity inside the battery pack exceed the set thresholds, it indicates that the lithium battery electrolyte has leaked, and then an alarm signal is output, which realizes audible and visual alarm through buzzer 14 and indicator light 15.

[0034] The integrated detector in this embodiment is located inside the lithium battery pack. The front panel area of ​​the lithium battery pack has a pre-reserved mounting position for the detector in the initial structural design. This area maintains a safe distance (≥25mm) from the cell modules to avoid affecting the cell heat dissipation path (air duct design) and electrical connections (busbar layout). Therefore, the installation of the integrated detector will not affect the normal operation of the lithium battery pack.

[0035] The substrate 4 of this utility model is fixed on the detector mounting plate 1. Although the carbonate gas sensor 10, VOC gas sensor 11, pressure sensor 12 and humidity sensor 13 are wrapped by other structures, this utility model can perform effective detection based on the following principle.

[0036] First, the high-pressure gases (VOCs, H2, CO, CO2, carbonates, etc.) generated by thermal runaway are rapidly ejected through the cell's explosion-proof valve, creating a convection effect within the battery pack and allowing them to diffuse uniformly throughout the entire space within milliseconds. Second, the densely distributed vents on the detector surface of this invention (including the end plate vent area 6-1 and the cylinder vent 8-1) form a highly efficient gas exchange interface with the sensor array. Based on Fick's diffusion law, gas molecules can quickly contact the sensor driven by concentration gradients, achieving full-space monitoring without relying on a multi-point layout.

[0037] Secondly, the target gas molecule size ranges from 0.289 nm (H2) to 0.7 nm (VOC), while the diameter of industrially processed vent holes (typically in the millimeter range, such as around 2 mm) is much larger than the target gas molecule size. According to the kinetic theory of gases, when the pore size is much larger than the mean free path of molecules (the mean free path of air molecules at room temperature is about 68 nm), the gas is in a viscous flow state when passing through the vent hole. At this time, gas molecules collide frequently, exhibiting "viscosity" like a liquid, and can pass through the vent hole smoothly and continuously with almost no obstruction from collisions with the pore wall, making the gas permeability close to 100%. This ensures that the detector can quickly and accurately sense changes in gas concentration within the battery pack.

[0038] It should be noted that, as will be apparent to those skilled in the art, this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. The scope of this utility model is defined by the claims rather than the foregoing description.

Claims

1. A battery electrolyte leakage detection system, comprising a lithium battery pack having a sidewall panel as a housing assembly, wherein a detector mounting plate (1) is mounted on one sidewall panel, characterized in that: The detection system also includes an integrated detector located inside the lithium battery pack and fixedly mounted on the detector mounting plate (1); the integrated detector includes a base plate (4) fixed to the detector mounting plate (1); the base plate (4) is connected to a protective cylinder (8), one end of which is fixed to the base plate (4) via a second connecting plate (7), and the other end has a protective end plate (6); the protective end plate (6) has several end plate ventilation holes; a detector circuit board (9) is provided inside the protective cylinder (8); a carbonate gas sensor (10), a VOC gas sensor (11), a pressure sensor (12), a humidity sensor (13), and a buzzer (14) are respectively mounted on the detector circuit board (9).

2. The battery electrolyte leakage detection system as described in claim 1, characterized in that: The protective cylinder (8) has several ventilation holes (8-1) on its cylinder wall.

3. The battery electrolyte leakage detection system as described in claim 1, characterized in that: The substrate (4) is fixedly connected to a first connecting plate (5) on its side. The first connecting plate (5) has bolt holes. The substrate (4) is fixed to the detector mounting plate (1) by connecting bolts passing through the bolt holes.

4. The battery electrolyte leakage detection system as described in claim 1, characterized in that: The second connecting plate (7) has bolt holes, and the protective cylinder (8) is fixed to the base plate (4) by connecting bolts passing through the bolt holes.

5. The battery electrolyte leakage detection system as described in claim 1, characterized in that: An indicator light (15) is also installed on the detector circuit board (9); correspondingly, an indicator light hole (6-2) is also provided on the protective end plate (6); the indicator light (15) protrudes from the indicator light hole (6-2).

6. The battery electrolyte leakage detection system as described in any one of claims 1 to 5, characterized in that: The detection system also includes a control host and a terminal monitoring platform; the control host is located outside the lithium battery pack and is connected to the integrated detector via a wiring harness to achieve wired communication; the control host and the terminal monitoring platform are wirelessly connected.

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