Valve-regulated lead-acid storage battery gassing abnormity detection system and detection method

Abstract

The invention discloses a valve-regulated lead-acid storage battery gassing anomaly detection system and method, the system comprises a valve-regulated lead-acid storage battery pack, a plurality of gas overflow valves, a plurality of gassing detection modules and a processor, the valve-regulated lead-acid storage battery pack comprises a plurality of valve-regulated lead-acid storage battery bodies connected in series; the air overflow valve is arranged on the valve-regulated lead-acid storage battery body; the gassing detection modules cover the overflow valve, and the processor is electrically connected with the gassing detection modules; the gas overflow valve is used for discharging gassed gas generated by the valve-regulated lead-acid storage battery body; the gassing detection module is used for detecting a gassing component signal and a gassing concentration signal of gassing, processing the signals and determining the density of the separated gas of the valve-regulated lead-acid storage battery body; and the processor receives the separated-out gas density of each valve-regulated lead-acid storage battery body sent by each gassing detection module, and determines the valve-regulated lead-acid storage battery body with abnormal gassing. By utilizing the system, the quality of the valve-regulated lead-acid storage battery body is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of valve-regulated lead-acid batteries, and in particular to a valve-regulated lead-acid battery gas evolution anomaly detection system and a detection method. Background Art

[0002] Due to the inconsistency of the manufacturing process and materials of the valve-regulated lead-acid battery, the valve opening pressure of the overflow valve is not completely consistent during the actual use of the valve-regulated lead-acid battery, which makes the exhaust time and exhaust volume of the valve-regulated lead-acid battery inconsistent, resulting in inconsistent degradation rates of each valve-regulated lead-acid battery, resulting in inconsistent overall state of the valve-regulated lead-acid battery group, which is an important reason why the valve-regulated lead-acid battery group cannot reach the project operation period. Therefore, it is a key technology to ensure the safe and stable operation of the valve-regulated lead-acid battery group to discover individual abnormal exhaust valve-regulated lead-acid batteries in the valve-regulated lead-acid battery group as soon as possible and replace the abnormal valve-regulated lead-acid batteries in time.

[0003] In order to ensure the overall degradation rate of valve-regulated lead-acid battery packs and realize safe and stable operation of valve-regulated lead-acid battery packs, there is an urgent need for a method that can perform abnormal detection on the gas evolution discharged by each valve-regulated lead-acid battery in the valve-regulated lead-acid battery pack, so as to quickly discover valve-regulated lead-acid batteries with abnormal gas evolution and avoid valve-regulated lead-acid battery failure caused by deterioration of the valve-regulated lead-acid battery pack. Summary of the invention

[0004] The present invention provides a valve-regulated lead-acid battery gas evolution abnormality detection system and detection method, so as to quickly identify valve-regulated lead-acid batteries with gas evolution abnormalities, avoid valve-regulated lead-acid battery failures caused by valve-regulated lead-acid battery group deterioration, ensure the safe and stable operation of the valve-regulated lead-acid battery group, and increase the service life of the valve-regulated lead-acid battery group.

[0005] In a first aspect, the present invention provides a valve-regulated lead-acid battery gas evolution abnormality detection system, comprising a valve-regulated lead-acid battery pack, a plurality of overflow valves, a plurality of gas evolution detection modules and a processor, wherein the valve-regulated lead-acid battery pack comprises a plurality of valve-regulated lead-acid battery bodies connected in series; the number of the valve-regulated lead-acid battery bodies is the same as the number of the overflow valves and the number of the gas evolution detection modules;

[0006] The overflow valve is arranged on the valve-regulated lead-acid battery body; the gas analysis detection module covers the overflow valve, and the processor is electrically connected to each gas analysis detection module;

[0007] The overflow valve is used to discharge the gas generated by the valve-regulated lead-acid battery body to the gas evolution detection module; the gas evolution detection module is used to detect the gas evolution component signal and the gas evolution concentration signal of the gas evolution, and perform signal processing on the gas evolution component signal and the gas evolution concentration signal to determine the density of the gas evolution of the valve-regulated lead-acid battery body; the processor is used to receive the gas evolution density of the valve-regulated lead-acid battery body sent by each gas evolution detection module, and determine the valve-regulated lead-acid battery body with abnormal gas evolution according to the gas evolution density of each valve-regulated lead-acid battery body.

[0008] Optionally, the gas analysis detection module includes a gas analysis collection box, a gas sensor, an air inlet and an air outlet, the gas analysis collection box contains a cavity, and the cavity is used to cover the overflow valve; the air inlet is arranged on a side of the gas analysis collection box close to the cavity, the air outlet is arranged on a side of the gas analysis collection box away from the cavity, and the gas sensor is arranged inside the gas analysis collection box and is located on the path where the gas analysis gas flows;

[0009] The air inlet is used to allow the gas discharged from the overflow valve to enter the gas collection box, and the air outlet is used to discharge the gas from the gas collection box; the gas sensor is used to detect the gas composition signal and gas concentration signal of the gas, and send the gas composition signal and gas concentration signal to the processor.

[0010] Optionally, the gas analysis detection module further includes a signal conversion unit and a signal processing unit; the signal conversion unit is electrically connected to the gas sensor, the signal conversion unit is electrically connected to the signal processing unit, and each signal processing unit is electrically connected to the processor;

[0011] The signal conversion unit is used to convert the gas composition signal and the gas concentration signal into a digital signal and send it to the signal processing unit; the signal processing unit is used to receive the digital signal and determine the density of the gas evolution of the valve-regulated lead-acid battery body according to the digital signal.

[0012] Optionally, the gas analysis detection module further includes a filtering and amplifying unit;

[0013] The filtering and amplifying unit is electrically connected between the signal conversion unit and the gas sensor, and is used to filter and amplify the gas component signal and the gas concentration signal, so that the amplified gas component signal and the gas concentration signal are sent to the signal conversion unit.

[0014] Optionally, the number of the exhaust holes is greater than or equal to 2; the gas analysis detection module further includes a sensor sealing cover;

[0015] The sensor sealing cover is located on the side of the overflow gas collection box away from the cavity, and the exhaust holes are evenly distributed between the peripheral area of ​​the overflow gas collection box and the sensor sealing cover;

[0016] The sensor sealing cover is detachably connected to the overflow gas collection box.

[0017] Optionally, the gas analysis detection module further includes a collection box sealing ring;

[0018] The collection box sealing ring is located between the overflow collection box and the valve-regulated lead-acid battery body, and is used to ensure that the overflow collection box fits tightly against the valve-regulated lead-acid battery body to completely cover the overflow valve.

[0019] Optionally, the system further includes a display module;

[0020] The display module is electrically connected to the processor; the processor is also used to control the display module to display the density of the gas evolution of each valve-regulated lead-acid battery body after receiving the density of the gas evolution of each valve-regulated lead-acid battery body.

[0021] Optionally, the system further includes an alarm module;

[0022] The alarm module is electrically connected to the processor; the processor is also used to control the alarm module to alarm after determining that the valve-regulated lead-acid battery body with abnormal gas evolution is found.

[0023] In a second aspect, the present invention provides a method for detecting abnormal gas evolution of a valve-regulated lead-acid battery, which is characterized in that it is executed based on the above-mentioned valve-regulated lead-acid battery abnormal gas evolution detection system, and comprises:

[0024] Receiving the density of the gas evolution of the valve-regulated lead-acid battery body sent by each gas evolution detection module;

[0025] According to the density of the gas evolution of each valve-regulated lead-acid battery body, the valve-regulated lead-acid battery body with abnormal gas evolution is determined.

[0026] Optionally, according to the density of the gas evolution of each valve-regulated lead-acid battery body, determining the valve-regulated lead-acid battery body with abnormal gas evolution includes:

[0027] According to the density of the gas evolution of each valve-regulated lead-acid battery body, the average gas evolution density, the maximum gas evolution density and the minimum gas evolution density of each valve-regulated lead-acid battery body are determined;

[0028] Determining a first difference between the maximum evolution gas density and the average evolution gas density, and a second difference between the average evolution gas density and the minimum evolution gas density based on the average evolution gas density, the maximum evolution gas density and the minimum evolution gas density;

[0029] When the first difference is greater than a preset gas evolution density limit, determining that the gas evolution of the valve-regulated lead-acid battery body corresponding to the maximum gas evolution density is abnormal;

[0030] When the second difference is greater than a preset gas evolution density limit, it is determined that the gas evolution of the valve-regulated lead-acid battery body corresponding to the minimum gas evolution density is abnormal.

[0031] The technical solution of the present invention is to set a gas evolution detection module and cover the gas evolution detection module above the overflow valve, so that the gas evolved by the valve-regulated lead-acid battery body can be quickly discharged to the gas evolution detection module when it is discharged through the overflow valve. The gas evolution detection module will detect the gas evolution component signal and the gas evolution concentration signal of the gas evolution, and perform signal processing on the detected gas evolution component signal and the gas evolution concentration signal to determine the density of the evolved gas of the valve-regulated lead-acid battery body; the determined evolved gas density of each valve-regulated lead-acid battery body will be sent to the processor, and after the processor receives the evolved gas density of each valve-regulated lead-acid battery body, it will analyze and process the evolved gas density of each determined valve-regulated lead-acid battery body, and finally determine the valve-regulated lead-acid battery body with abnormal gas evolution. By using the above system, valve-regulated lead-acid batteries with abnormal gas evolution are quickly identified, thus avoiding valve-regulated lead-acid battery failure due to deterioration of the valve-regulated lead-acid battery pack, ensuring the safe and stable operation of the valve-regulated lead-acid battery pack, and improving the quality and service life of the valve-regulated lead-acid battery pack.

[0032] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of the structure of a valve-regulated lead-acid battery gas evolution anomaly detection system provided by an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the structure of a valve-regulated lead-acid battery pack provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the structure of a valve-regulated lead-acid battery body provided by an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of the structure of a gas analysis detection module provided by an embodiment of the present invention;

[0038] Figure 5 A top view of a gas analysis detection module provided in an embodiment of the present invention;

[0039] Figure 6 A side view of a gas analysis detection module provided by an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of the physical structure of a gas analysis detection module provided in an embodiment of the present invention;

[0041] Figure 8 A structural schematic diagram of the connection relationship of a valve-regulated lead-acid battery gas evolution abnormality detection system provided in an embodiment of the present invention;

[0042] Fig. 9 A schematic diagram of the structure of a second valve-regulated lead-acid battery gas evolution anomaly detection system provided in an embodiment of the present invention;

[0043] Fig.10 A flow chart of a method for detecting abnormal gas evolution in a valve-regulated lead-acid battery provided by an embodiment of the present invention;

[0044] Fig.11 A flow chart of a second method for detecting abnormal gas evolution in a valve-regulated lead-acid battery provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] In one embodiment, Figure 1 A schematic diagram of a valve-regulated lead-acid battery gas evolution anomaly detection system provided by an embodiment of the present invention is provided. Figure 2A schematic diagram of the structure of a valve-regulated lead-acid battery pack provided in an embodiment of the present invention, Figure 3 The present invention provides a schematic diagram of the structure of a valve-regulated lead-acid battery body. This embodiment can be used to detect the gas evolution of the valve-regulated lead-acid battery body to quickly determine the situation of the valve-regulated lead-acid battery body with abnormal gas evolution, such as Figures 1 to 3 As shown, the system includes: a valve-regulated lead-acid battery pack 1, a plurality of overflow valves 2, a plurality of gas evolution detection modules 3 and a processor 4, wherein the valve-regulated lead-acid battery pack 1 includes a plurality of valve-regulated lead-acid battery bodies 11 connected in series; the number of valve-regulated lead-acid battery bodies 11 is the same as the number of overflow valves 2 and the number of gas evolution detection modules 3; the overflow valves 2 are arranged on the valve-regulated lead-acid battery bodies 11; the gas evolution detection modules 3 are covered on the overflow valves 2, and the processor 4 is electrically connected to each gas evolution detection module 3; the overflow valves 2 are used to The gas generated by the main body 11 is discharged to the gas evolution detection module 3; the gas evolution detection module 3 is used to detect the gas evolution component signal and the gas evolution concentration signal of the gas evolution, and perform signal processing on the gas evolution component signal and the gas evolution concentration signal to determine the density of the gas evolution of the valve-regulated lead-acid battery main body 11; the processor 4 is used to receive the gas evolution density of each valve-regulated lead-acid battery main body 11 sent by each gas evolution detection module 3, and determine the valve-regulated lead-acid battery main body 11 with abnormal gas evolution according to the gas evolution density of each valve-regulated lead-acid battery main body 11.

[0048] Among them, the valve regulated lead acid battery (VRLA) is a sealed lead acid battery, which controls the discharge of internal gas through a pressure release valve, namely, a relief valve 2, so as to achieve sealing. The valve regulated lead acid battery 1 includes a plurality of valve regulated lead acid battery bodies 11 connected in series, and the valve regulated lead acid battery bodies 11 are all single cells. The relief valve 2 is also called a safety valve, and its main function is to automatically open and release gas when the gas pressure inside the valve regulated lead acid battery body 11 exceeds a certain value, and then automatically close to prevent air from entering the valve regulated lead acid battery body 11. This design ensures the sealing of the valve regulated lead acid battery body 11, prevents acid leakage, and prevents moisture and impurities in the external air from entering the battery, thereby protecting the performance and life of the valve regulated lead acid battery body 11. The gas evolution detection module 3 is used to detect and process the signal of the gas evolution generated by the valve regulated lead acid battery body 11 to determine the density of the gas evolution of the valve regulated lead acid battery body 11. Typically, each valve-regulated lead-acid battery body 11 is provided with a relief valve 2 and a gas evolution detection module 3 provided on the relief valve 2. The processor 4 is the core control unit of the detection system, and is used to receive the density of the evolved gas of the valve-regulated lead-acid battery body 11 sent by the gas evolution detection module 3, and to determine the valve-regulated lead-acid battery body 11 with abnormal gas evolution according to the evolved gas density.

[0049] Before introducing the technical solution of the present embodiment, the background technology of the valve-regulated lead-acid battery pack 1 is briefly described first. Normally, the valve-regulated lead-acid battery body 11 is widely used as a backup power supply for the secondary DC power supply system of a substation because of its high safety and high stability. Because the voltage of the secondary DC power supply system of a substation is generally divided into two types, 110V or 220V, and the large-capacity valve-regulated lead-acid battery body 11 adopts a monomer structure, the rated voltage of a single battery is only 2V. Therefore, when the valve-regulated lead-acid battery body 11 is used as a backup power supply for the secondary DC power supply system of a substation, 54 single cells or 108 single cells are generally connected in series to form a group for use. For reference, Figure 2 As shown, B1, B2, ..., Bn represent the valve-regulated lead-acid battery bodies 11 connected in series, and the positive and negative electrodes of the valve-regulated lead-acid battery group 1 connected in series are respectively connected to the DC bus. The DC bus is connected to the AC power through the AC / DC charger.

[0050] When the secondary DC power supply system of the substation is in operation, the 220V AC mains electricity supplies power to the DC bus through the AC / DC charger, and provides a small floating charge current or a large equalizing charge current to the valve-regulated lead-acid battery group 1, thereby maintaining the voltage stability of the valve-regulated lead-acid battery group 1 to achieve the backup capacity of the valve-regulated lead-acid battery group 1. When the valve-regulated lead-acid battery group 1 is in the process of high-current equalizing charging, a series of chemical reactions will occur in the active substances inside the valve-regulated lead-acid battery body 11, and the externally provided electrical energy will be stored in the form of chemical energy. The chemical equation of this process is: 2PbSO4+2H2O=Pb+PbO2+2H2SO4. It can be seen that sulfuric acid, water and lead compounds participate in chemical reactions during the charging and discharging process of the valve-regulated lead-acid battery group 1. When the VRLA battery pack 1 is overcharged or subjected to long-term overvoltage floating charge or high-current equalization charge, the VRLA battery body 11 will experience deterioration reaction of water electrolysis due to insufficient active substances. The chemical equation of this process is 2H2O=2O2↑+2H2↑.

[0051] refer to Figure 3 When the above-mentioned electrolysis of water is relatively light, the gas pressure inside the valve-regulated lead-acid battery body 11 is relatively small, and the overflow valve 2 will not open, causing the hydroxyl ions produced by the above-mentioned chemical reaction to be unable to be discharged and stored in the electrolyte, waiting for the valve-regulated lead-acid battery body 11 to be charged and then undergo a reversible reaction to return to the state of water. When the valve-regulated lead-acid battery body 11 is seriously overcharged, the gas pressure generated inside the valve-regulated lead-acid battery body 11 is greater than the control threshold of the overflow valve 2, and the internal gas can be discharged to the outside through the overflow valve 2, thereby preventing the valve-regulated lead-acid battery body 11 from expanding due to abnormal internal pressure. Therefore, the overflow valve 2 is an important structure to ensure the normal internal pressure of the valve-regulated lead-acid battery body 11, and the quality of the valve-regulated lead-acid battery body 11 can be determined based on the gas discharged by the overflow valve 2, i.e., the gas evolution.

[0052] In this regard, in order to determine the gas evolution of each valve-regulated lead-acid battery body 11 in the valve-regulated lead-acid battery pack 1, the present embodiment is provided with a gas evolution detection module 3 on each overflow valve 2, and the gas evolution detection module 3 completely covers the overflow valve 2. After the active substance in the valve-regulated lead-acid battery body 11 undergoes a chemical reaction to generate gas evolution, the gas evolution will be discharged through the overflow valve 2, and the discharged gas evolution will enter the gas evolution detection module 3. After the gas evolution detection module 3 detects the gas evolution, the gas evolution component signal and the gas evolution concentration signal of the gas evolution will be detected, wherein the gas evolution component signal may include sulfuric acid, water and lead compounds, and the gas evolution concentration signal is the percentage of the gas evolution component in the air. After each gassing detection module 3 detects the gassing component signal and gassing concentration signal of the corresponding valve-regulated lead-acid battery body 11, it will perform signal processing on the detected gassing component signal and gassing concentration signal, convert the gassing component signal and gassing concentration signal into digital signals, process the converted digital signals, determine the density of the gas evolution of the valve-regulated lead-acid battery body 11, and send the density of the gas evolution of the valve-regulated lead-acid battery body 11 to the processor 4. After receiving the density of the gas evolution of each valve-regulated lead-acid battery body 11 sent by each gassing detection module 3, the processor 4 will calculate and process the density of the gas evolution of each valve-regulated lead-acid battery body 11 according to the density of the gas evolution of each valve-regulated lead-acid battery body 11, and finally determine the valve-regulated lead-acid battery body 11 with abnormal gas evolution.

[0053] The technical solution of the embodiment of the present invention is to set a gas evolution detection module and cover the gas evolution detection module above the overflow valve, so that the gas evolved by the valve-regulated lead-acid battery body can be quickly discharged to the gas evolution detection module when it is discharged through the overflow valve. The gas evolution detection module will detect the gas evolution component signal and the gas evolution concentration signal of the gas evolution, and perform signal processing on the detected gas evolution component signal and the gas evolution concentration signal to determine the density of the evolved gas of the valve-regulated lead-acid battery body; the determined evolved gas density of each valve-regulated lead-acid battery body will be sent to the processor, and after the processor receives the evolved gas density of each valve-regulated lead-acid battery body, it will analyze and process the evolved gas density of each determined valve-regulated lead-acid battery body, and finally determine the valve-regulated lead-acid battery body with abnormal gas evolution. By using the above system, valve-regulated lead-acid batteries with abnormal gas evolution are quickly identified, thus avoiding valve-regulated lead-acid battery failure due to deterioration of the valve-regulated lead-acid battery pack, ensuring the safe and stable operation of the valve-regulated lead-acid battery pack, and improving the quality and service life of the valve-regulated lead-acid battery pack.

[0054] In another specific embodiment, optionally, Figure 4 A schematic diagram of the structure of a gas analysis detection module provided by an embodiment of the present invention, Figure 5 A top view of a gas analysis detection module provided in an embodiment of the present invention, Figure 6 A side view of a gas analysis detection module provided by an embodiment of the present invention, Figure 7 A schematic diagram of the physical structure of a gas analysis detection module provided in an embodiment of the present invention, referring to Figures 4 to 7 As shown, the gas analysis detection module 3 includes a gas analysis collection box 31, a gas sensor 32, an air inlet 33 and an exhaust hole 34. The gas analysis collection box 31 contains a cavity 311, and the cavity 311 is used to cover the overflow valve 2; the air inlet 33 is arranged on the side of the gas analysis collection box 31 close to the cavity 311, and the exhaust hole 34 is arranged on the side of the gas analysis collection box 31 away from the cavity 311. The gas sensor 32 is arranged inside the gas analysis collection box 31 and is located on the flow path of the gas analysis; the air inlet 33 is used to allow the gas discharged from the overflow valve 2 to enter the gas analysis collection box 31, and the exhaust hole 34 is used to discharge the gas from the gas analysis collection box 31; the gas sensor 32 is used to detect the gas analysis component signal and the gas analysis concentration signal of the gas analysis, and send the gas analysis component signal and the gas analysis concentration signal to the processor 4.

[0055] Among them, the gas collection box 31 is used to ensure that the gas is passed through and discharged. A cavity 311 is provided in the gas collection box 31, and the cavity 311 is used to cover the overflow valve 2, that is, the overflow valve 2 is located in the cavity 311. The gas sensor 32 is arranged inside the gas collection box 31, and is located on the gas flow path of the gas, that is, the gas sensor 32 is located between the air inlet 33 and the exhaust hole 34, so as to ensure that the gas sensor 32 can detect the gas composition signal and gas concentration signal of the gas after the gas enters the gas collection box 31 from the air inlet 33, and send the detected gas composition signal and gas concentration signal to the processor 4. The air inlet 33 is used to allow the gas discharged from the overflow valve 2 to enter the gas collection box 31, and the exhaust hole 34 is used to discharge the gas from the gas collection box 31. In this embodiment, in order to ensure that the gas can be discharged quickly, the number of the air inlet holes 33 and the air exhaust holes 34 can be set to 4, and the four air inlet holes 33 are evenly and symmetrically distributed on the four surfaces of the inner wall of the overflow gas collection box 31, and the four air exhaust holes 34 are evenly and symmetrically distributed on the upper surface of the overflow gas collection box 31. Figure 5 shown.

[0056] Specifically, after the cavity 311 is covered on the overflow valve 2, when the valve-regulated lead-acid battery body 11 generates gas, the gas will enter the gas inlet 33 of the gas detection module 3 through the overflow valve 2, and be discharged through the exhaust hole 34. At this time, the gas sensor 32 located on the gas flow path will detect the gas component signal and gas concentration signal of the gas flowing through, and send the detected gas component signal and gas concentration signal to the processor 4.

[0057] In another specific embodiment, optionally, Figure 8 A schematic diagram of the connection relationship of a valve-regulated lead-acid battery gas evolution abnormality detection system provided in an embodiment of the present invention, with reference to Figure 4 and Figure 8 As shown, the gas evolution detection module 3 also includes a signal conversion unit 35 and a signal processing unit 36; the signal conversion unit 35 is electrically connected to the gas sensor 32, the signal conversion unit 35 is electrically connected to the signal processing unit 36, and each signal processing unit 36 ​​is electrically connected to the processor 4; the signal conversion unit 35 is used to convert the gas evolution component signal and the gas evolution concentration signal into a digital signal and send it to the signal processing unit 36; the signal processing unit 36 ​​is used to receive the digital signal and determine the density of the evolved gas of the valve-regulated lead-acid battery body 11 according to the digital signal.

[0058] Among them, the signal conversion unit 35 is mainly responsible for converting a signal in one form into another form. In the present embodiment, the signal conversion unit 35 is used to convert the analog signals of the gasification component signal and the gasification concentration signal into digital signals for calculation by the signal processing unit 36. The signal processing unit 36 ​​processes and calculates the acquired signal to obtain a preset calculation result. In the present embodiment, the signal processing unit 36 ​​is used to process and calculate the digital signal representing the gasification component signal and the gasification concentration signal according to the digital signal converted by the signal conversion unit 35, and finally obtain the gas density of each valve-regulated lead-acid battery body 11. The process of the signal processing unit 36 ​​processing the digital signal can be determined by a specific logic algorithm according to the actual situation, which is not limited here.

[0059] In another specific embodiment, optionally, continue to refer to Figure 8 The gas analysis detection module 3 also includes a filtering and amplifying unit 39; the filtering and amplifying unit 39 is electrically connected between the signal conversion unit 35 and the gas sensor 32, and is used to filter and amplify the gas analysis component signal and the gas analysis concentration signal, so that the amplified gas analysis component signal and the gas analysis concentration signal are sent to the signal conversion unit 35.

[0060] Among them, the filtering and amplifying unit 39 includes a filtering subunit and an amplifying subunit. After receiving the gas evolution component signal and the gas evolution concentration signal, the filtering subunit in the filtering and amplifying unit 39 will filter the gas evolution component signal and the gas evolution concentration signal. After filtering, the amplifying subunit will amplify the gas evolution component signal and the gas evolution concentration signal so that the amplified signal is sent to the signal conversion unit 35.

[0061] Optional, continue to refer to Figure 4 and Figure 5 , the number of exhaust holes 34 is greater than or equal to 2; the gas analysis detection module 3 also includes a sensor sealing cover 37; the sensor sealing cover 37 is located on the side of the overflow collection box 31 away from the cavity 311, and the exhaust holes 34 are evenly distributed between the peripheral area of ​​the overflow collection box 31 and the sensor sealing cover 37; the sensor sealing cover 37 is detachably connected to the overflow collection box 31.

[0062] The sensor sealing cover 37 is used to protect the gas sensor 32, the signal conversion module 35, the signal processing module 36 and the filter amplifier unit 39 from dirt and plays a certain protective role. In addition, the sensor sealing cover 37 and the overflow gas collection box 31 are detachably connected, and the specific connection method may include but is not limited to connection through a hinge, which is used to facilitate the replacement of the gas sensor 32, the signal conversion module 35, the signal processing module 36 and the filter amplifier unit 39, which is simple and quick. In addition, in order to ensure that the position of the exhaust hole 34 is not occupied, when setting the exhaust hole 34, refer to Figure 5 As shown, the exhaust holes 34 can be evenly distributed between the peripheral area of ​​the overflow gas collection box 31 and the sensor sealing cover 37 to ensure normal exhaust of the gas.

[0063] Optional, continue to refer to Figure 4 The gas analysis detection module 3 also includes a collection box sealing ring 38; the collection box sealing ring 38 is located between the overflow collection box 31 and the valve-regulated lead-acid battery body 11, and is used to ensure that the overflow collection box 31 is tightly fitted with the valve-regulated lead-acid battery body 11 to completely cover the overflow valve 2.

[0064] Among them, the collection box sealing ring 38 is arranged between the valve-regulated lead-acid battery body 11 and the overflow collection box 31, which is used to completely seal the overflow valve 2 so that all the gas passing through the overflow valve 2 is discharged to the gas analysis detection module 3, and not discharged from other parts, thereby ensuring the accuracy of the detection.

[0065] Optional, Fig. 9 The schematic diagram of the structure of the second valve-regulated lead-acid battery gas evolution abnormality detection system provided in the embodiment of the present invention is shown in FIG. Fig. 9 As shown, the system also includes a display module 5; the display module 5 is electrically connected to the processor 4; the processor 4 is also used to control the display module 5 to display the density of the gas evolution of each valve-regulated lead-acid battery body 11 after receiving the density of the gas evolution of each valve-regulated lead-acid battery body 11.

[0066] Optional, continue to refer to Fig. 9 The system further comprises an alarm module 6; the alarm module 6 is electrically connected to the processor 4; the processor 4 is also used to control the alarm module 6 to sound an alarm after determining that the valve-regulated lead-acid battery body 11 has abnormal gas evolution.

[0067] Among them, the display module 6 is used to display the density of the gas evolution of each valve-controlled lead-acid battery body 11 after the processor 4 receives the density of the gas evolution of each valve-controlled lead-acid battery body 11, so that the staff can check the gas evolution of each valve-controlled lead-acid battery body 11 in time, and the display module 6 may include but is not limited to display screens or projectors and other devices that can be used for display. The alarm module 6 is used to alarm after the processor 4 determines that the valve-controlled lead-acid battery body 11 with abnormal gas evolution has occurred, so as to promptly notify the staff that the valve-controlled lead-acid battery body 11 has abnormal gas evolution, so as to facilitate the staff to perform timely maintenance. At the same time, the position of the valve-controlled lead-acid battery body 11 with abnormal gas evolution can be specifically determined by the content displayed by the display module 6. The alarm sound of the alarm module 6 may include but is not limited to "di di di", "da da da" and other sounds that can be clearly heard by the staff.

[0068] Based on the same inventive concept, Fig.10 A flow chart of a method for detecting abnormal gas evolution of a valve-regulated lead-acid battery provided in an embodiment of the present invention. The detection method is executed based on the above-mentioned valve-regulated lead-acid battery gas evolution abnormality detection system. Fig.10 As shown, the method includes:

[0069] S110, receiving the density of gas evolution of each valve-regulated lead-acid battery body sent by each gas evolution detection module.

[0070] S120, determining a valve-regulated lead-acid battery body with abnormal gas evolution according to the density of gas evolution of each valve-regulated lead-acid battery body.

[0071] Specifically, after receiving the gas evolution density of each valve-regulated lead-acid battery body sent by each gas evolution detection module, the gas evolution density of each valve-regulated lead-acid battery body will be calculated and processed according to the gas evolution density of each valve-regulated lead-acid battery body, and finally the valve-regulated lead-acid battery body with abnormal gas evolution can be determined.

[0072] The technical solution of the embodiment of the present invention receives the density of the gas evolution of each valve-regulated lead-acid battery body sent by each gas evolution detection module; according to the density of the gas evolution of each valve-regulated lead-acid battery body, the valve-regulated lead-acid battery body with abnormal gas evolution is determined. By using the above method, the valve-regulated lead-acid battery with abnormal gas evolution is quickly determined, and the valve-regulated lead-acid battery failure caused by the deterioration of the valve-regulated lead-acid battery group is avoided, the safe and stable operation of the valve-regulated lead-acid battery group is guaranteed, and the quality and service life of the valve-regulated lead-acid battery group are improved.

[0073] In another specific embodiment, Fig.11 The flowchart of the second method for detecting abnormal gas evolution of a valve-regulated lead-acid battery provided by the embodiment of the present invention is shown in FIG. Fig.11As shown, the detection method includes:

[0074] S210, receiving the density of gas evolution of each valve-regulated lead-acid battery body sent by each gas evolution detection module.

[0075] S220. Determine the average gas evolution density, the maximum gas evolution density and the minimum gas evolution density of each valve-regulated lead-acid battery body according to the gas evolution density of each valve-regulated lead-acid battery body.

[0076] Specifically, after determining the gas evolution density of each valve-regulated lead-acid battery body, the gas evolution density of each valve-regulated lead-acid battery body is accumulated and divided by the number of valve-regulated lead-acid battery bodies, and the average gas evolution density of each valve-regulated lead-acid battery body can be calculated, that is, is the average evolution gas density, ρ k is the gas evolution density of each valve-regulated lead-acid battery body, and n is the number of valve-regulated lead-acid battery bodies. In addition, it is also necessary to determine the maximum gas evolution density and the minimum gas evolution density among the gas evolution densities of each valve-regulated lead-acid battery body, that is, Max(ρ1, ρ2, ..., ρ k ) and Min(ρ1, ρ2, ..., ρ k ), among which, ρ1, ρ2,...,ρ k is the density of the evolved gas corresponding to each valve-regulated lead-acid battery body.

[0077] S230: Determine a first difference between the maximum deposition gas density and the average deposition gas density, and a second difference between the average deposition gas density and the minimum deposition gas density according to the average deposition gas density, the maximum deposition gas density and the minimum deposition gas density.

[0078] Specifically, after determining the average gas evolution density, the maximum gas evolution density, and the minimum gas evolution density of each valve-regulated battery body, it is necessary to determine the valve-regulated lead-acid battery body with abnormal gas evolution. In this embodiment, according to the average gas evolution density and the maximum gas evolution density, the maximum gas evolution density and the average gas evolution density are calculated by difference, so as to obtain a first difference between the maximum gas evolution density and the average gas evolution density. According to the average gas evolution density and the minimum gas evolution density, the average gas evolution density and the minimum gas evolution density are calculated by difference, so as to obtain a second difference between the average gas evolution density and the minimum gas evolution density.

[0079] S240: When the first difference is greater than a preset gas evolution density limit, determine that the gas evolution of the valve-regulated lead-acid battery body corresponding to the maximum gas evolution density is abnormal.

[0080] Specifically, when the first difference is greater than the preset gas evolution density limit, it indicates that the difference between the gas evolution density of the valve-regulated lead-acid battery body with the largest gas evolution amount and the average gas evolution density exceeds the set limit value, and the gas evolution amount of the valve-regulated lead-acid battery body corresponding to the maximum gas evolution density is too high, then it can be determined that the gas evolution of the valve-regulated lead-acid battery body corresponding to the maximum gas evolution density is abnormal. Among them, the preset gas evolution density limit can be determined according to the actual situation, and is not limited here. For example, the preset gas evolution density limit is

[0081] S250: When the second difference is greater than a preset gas evolution density limit, determine that the gas evolution of the valve-regulated lead-acid battery body corresponding to the minimum gas evolution density is abnormal.

[0082] Specifically, when the second difference is greater than the preset gas evolution density limit, it indicates that the difference between the average gas evolution density and the gas evolution density of the valve-regulated lead-acid battery body with the smallest gas evolution amount exceeds the set limit value, and the gas evolution amount of the valve-regulated lead-acid battery body corresponding to the smallest gas evolution density is too low, and it can be determined that the gas evolution of the valve-regulated lead-acid battery body corresponding to the smallest gas evolution density is abnormal. Exemplarily, the preset gas evolution density limit is

[0083] The technical solution of the embodiment of the present invention quickly identifies valve-regulated lead-acid batteries with abnormal gas evolution, avoids valve-regulated lead-acid battery failure caused by deterioration of the valve-regulated lead-acid battery pack, ensures the safe and stable operation of the valve-regulated lead-acid battery pack, and improves the quality and service life of the valve-regulated lead-acid battery pack.

[0084] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0085] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve-regulated lead-acid battery gas evolution abnormality detection system, characterized in that: It comprises a valve-regulated lead-acid battery pack, a plurality of overflow valves, a plurality of gas evolution detection modules and a processor, wherein the valve-regulated lead-acid battery pack comprises a plurality of valve-regulated lead-acid battery bodies connected in series; the number of the valve-regulated lead-acid battery bodies is the same as the number of the overflow valves and the number of the gas evolution detection modules; The overflow valve is arranged on the valve-regulated lead-acid battery body; the gas analysis detection module is covered on the overflow valve, and the processor is electrically connected to each of the gas analysis detection modules; The overflow valve is used to discharge the gas generated by the valve-regulated lead-acid battery body to the gas evolution detection module; the gas evolution detection module is used to detect the gas evolution component signal and the gas evolution concentration signal of the gas evolution, and perform signal processing on the gas evolution component signal and the gas evolution concentration signal to determine the density of the gas evolution of the valve-regulated lead-acid battery body; the processor is used to receive the gas evolution density of each valve-regulated lead-acid battery body sent by each gas evolution detection module, and determine the valve-regulated lead-acid battery body with abnormal gas evolution according to the gas evolution density of each valve-regulated lead-acid battery body.

2. The detection system according to claim 1, characterized in that: The gas analysis detection module includes a gas analysis collection box, a gas sensor, an air inlet and an air outlet. The gas analysis collection box contains a cavity, and the cavity is used to cover the overflow valve; the air inlet is arranged on a side of the gas analysis collection box close to the cavity, and the air outlet is arranged on a side of the gas analysis collection box away from the cavity. The gas sensor is arranged inside the gas analysis collection box and is located on the flow path of the gas analysis gas; The air inlet is used to allow the gas discharged from the overflow valve to enter the gas collection box, and the air outlet is used to discharge the gas from the gas collection box; the gas sensor is used to detect the gas composition signal and the gas concentration signal of the gas, and send the gas composition signal and the gas concentration signal to the processor.

3. The detection system according to claim 2, characterized in that: The gas analysis detection module further includes a signal conversion unit and a signal processing unit; the signal conversion unit is electrically connected to the gas sensor, the signal conversion unit is electrically connected to the signal processing unit, and each of the signal processing units is electrically connected to the processor; The signal conversion unit is used to convert the gas composition signal and the gas concentration signal into digital signals and send them to the signal processing unit; the signal processing unit is used to receive the digital signals and determine the density of the gas evolution of the valve-regulated lead-acid battery body based on the digital signals.

4. The detection system according to claim 3, characterized in that: The gas analysis detection module also includes a filtering and amplifying unit; The filtering and amplifying unit is electrically connected between the signal conversion unit and the gas sensor, and is used to filter and amplify the gas component signal and the gas concentration signal, so that the amplified gas component signal and the gas concentration signal are sent to the signal conversion unit.

5. The detection system according to claim 2, characterized in that: The number of the exhaust holes is greater than or equal to 2; the gas analysis detection module also includes a sensor sealing cover; The sensor sealing cover is located on a side of the gas overflow collection box away from the cavity, and the exhaust holes are evenly distributed between the peripheral area of ​​the gas overflow collection box and the sensor sealing cover; The sensor sealing cover is detachably connected to the overflow gas collection box.

6. The detection system according to claim 2, characterized in that: The gas analysis detection module also includes a collection box sealing ring; The collection box sealing ring is located between the overflow collection box and the valve-regulated lead-acid battery body, and is used to ensure that the overflow collection box is tightly fitted to the valve-regulated lead-acid battery body to completely cover the overflow valve.

7. The detection system according to claim 1, characterized in that: Also includes a display module; The display module is electrically connected to the processor; the processor is also used to control the display module to display the density of the gas evolution of each valve-regulated lead-acid battery body after receiving the density of the gas evolution of each valve-regulated lead-acid battery body.

8. The detection system according to claim 1, characterized in that: Also includes an alarm module; The alarm module is electrically connected to the processor; the processor is also used to control the alarm module to alarm after determining that the valve-regulated lead-acid battery body has abnormal gas evolution.

9. A method for detecting abnormal gas evolution of a valve-regulated lead-acid battery, characterized in that: The method is implemented based on the valve-regulated lead-acid battery gas evolution abnormality detection system according to any one of claims 1 to 8, comprising: Receiving the density of the gas evolution of each valve-regulated lead-acid battery body sent by each gas evolution detection module; According to the density of the gas evolution of each of the valve-regulated lead-acid battery bodies, the valve-regulated lead-acid battery body with abnormal gas evolution is determined.

10. The detection method according to claim 9, characterized in that: According to the density of the gas evolution of each valve-regulated lead-acid battery body, the valve-regulated lead-acid battery body with abnormal gas evolution is determined, comprising: Determine the average gas density, the maximum gas density and the minimum gas density of each valve-regulated lead-acid battery body according to the gas density of each valve-regulated lead-acid battery body; Determining, based on the average deposited gas density, the maximum deposited gas density, and the minimum deposited gas density, a first difference between the maximum deposited gas density and the average deposited gas density, and a second difference between the average deposited gas density and the minimum deposited gas density; When the first difference is greater than a preset gas evolution density limit, determining that the gas evolution of the valve-regulated lead-acid battery body corresponding to the maximum gas evolution density is abnormal; When the second difference is greater than a preset gas evolution density limit, it is determined that the gas evolution of the valve-regulated lead-acid battery body corresponding to the minimum gas evolution density is abnormal.

Images