CN113675907B - Electric energy meter capable of preventing battery passivation - Google Patents
Electric energy meter capable of preventing battery passivation Download PDFInfo
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- CN113675907B CN113675907B CN202110710749.5A CN202110710749A CN113675907B CN 113675907 B CN113675907 B CN 113675907B CN 202110710749 A CN202110710749 A CN 202110710749A CN 113675907 B CN113675907 B CN 113675907B
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- resistor
- lithium battery
- circuit board
- circuit
- passivation
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- 238000002161 passivation Methods 0.000 title claims abstract description 71
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 100
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 208000028659 discharge Diseases 0.000 claims description 38
- 239000003990 capacitor Substances 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 25
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to an electric energy meter capable of preventing battery passivation, which comprises a shell, a circuit board and a lithium battery, wherein the circuit board comprises a processor, an LVI detection circuit, a PWM pulse discharging circuit, a current detection circuit, a switching circuit and a memory chip, and the LVI detection circuit, the current detection circuit, the PWM pulse discharging circuit, the switching circuit and the memory chip are all connected with the processor; the invention has the advantages that: the LVI detection circuit is used for checking the power supply of the power grid, the processor controls the switching circuit to switch the power supply mode of the electric energy meter according to the signal of the LVI detection circuit, and can also switch the depassivation working mode of the lithium battery.
Description
Technical Field
The invention relates to an electric energy meter capable of preventing battery passivation.
Background
At present, the electric energy meter industry in China is in a substitution stage of an intelligent electric meter, along with the development of a Chinese intelligent power grid, the intelligent electric meter is developed to the present as an important component part of an electric consumption link of the intelligent power grid, and the intelligent electric meter has numerous advantages: the advantages of stability, precision, service life and the like are widely accepted in the industry, and technologies such as autonomous meter reading, automatic settlement, data encryption and the like are in the leading position in the world, and although the advantages are many, the development process of the intelligent electric meter is always accompanied with a great hidden trouble: that is, the problem of battery under-voltage causes clock problem, and the realization of accurate timing depends on uninterrupted operation of a special clock chip. Conventionally, through the access of external electric network, the smart electric meter can supply power for the clock chip, even if the smart electric meter has a power failure due to various reasons, the built-in lithium battery can also be seamlessly switched to provide continuous power for the clock chip, and the clock of the smart electric meter is kept correct.
The lithium battery has the advantages of higher energy mass ratio and energy volume ratio, low self-discharge rate, no memory effect, long service life and lower price, so the lithium battery becomes a power supply which is preferentially selected by various electrical equipment, and when the lithium battery is used with extremely small current or is stored for a period of time in a standing way, when a larger working current is suddenly required, the voltage of the battery drops considerably or even falls below the working voltage of the equipment, so that the battery cannot be used normally, the phenomenon is called voltage hysteresis phenomenon, which becomes an important factor for restricting the reliable use of the lithium battery, and the battery passivation is a large characteristic of the lithium battery and is the basis of the long service life of the battery; the advanced passivation film forming basis and the related electrochemical technology of passivation film removal need to be mastered, the internal reaction channel of the battery is blocked by serious passivation, even if materials remain, electricity cannot be discharged, the service life of the battery is finished in advance, the larger the discharging current of the battery is, the more obvious the voltage hysteresis is, the longer the battery is stored, particularly, the battery is stored at high temperature for a long time, the passivation protection layer is thickened, so that the voltage hysteresis of the battery is tighter, no specific treatment measures are taken for battery passivation by the intelligent electric energy meter in the market at present, and the service life of the clock in the electric energy meter is influenced.
Disclosure of Invention
The invention aims to provide the electric energy meter capable of preventing battery passivation, and the electric energy meter can be used for carrying out passivation treatment on a lithium battery in the electric energy meter so as to realize optimal service life matching of the lithium battery and the electric energy meter.
In order to solve the technical problems, the invention is realized by the following technical scheme: the utility model provides an electric energy meter capable of preventing battery passivation, includes casing, circuit board and the lithium cell of setting in the casing, the circuit board is installed in the casing, the circuit board includes the treater for detect the LVI detection circuitry who gathers electric wire netting supply voltage, be used for the PWM pulse discharge circuit to lithium cell discharge, be used for detecting the electric current detection circuitry who gathers lithium cell and remove discharging current when passivation, control switch network power supply and lithium cell power supply's switching circuit, and be used for the memory chip of taking notes lithium cell and remove passivation event, LVI detection circuitry, electric current detection circuitry, PWM pulse discharge circuit, switching circuit and memory chip all link to each other with the treater, electric current detection circuitry links to each other with PWM pulse discharge circuit, be connected with the temperature sensor who gathers the temperature in the casing on the treater, the treater receives temperature signal of temperature sensor and calculates the discharge current who obtains PWM pulse discharge circuit, and control PWM pulse discharge circuit carries out discharge treatment to lithium cell, electric current detection circuitry gathers discharging current and judges the passivation state of lithium cell passivation film and sends the signal to the treater, the treater receives the lithium cell and removes passivation signal to switch over lithium cell and remove passivation event, be equipped with RTC module and RTC module on the clock module, the module is equipped with the clock module and the module that the clock module links to each other.
Preferably, the PWM pulse discharging circuit includes a capacitor C1, a resistor R2, a resistor R3, and a high-speed MOS tube, where a gate of the high-speed MOS tube is connected to the processor through the resistor R1, a source of the high-speed MOS tube is grounded, the capacitor C1 is connected in parallel to two ends of the resistor R1, one end of the capacitor C1 is grounded through the resistor R2, and a drain of the high-speed MOS tube is connected to an anode of the lithium battery through the resistor R3;
the current detection circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, an operational amplifier op1, an operational amplifier op2 and an operational amplifier op3, wherein the forward input end of the operational amplifier op1 is connected with one end of the resistor R3, the forward input end of the operational amplifier op2 is connected with the other end of the resistor R3, the output end of the operational amplifier op1 is grounded through the resistor R8 and the resistor R10, the forward input end of the operational amplifier op3 is connected with one end connected with R10, the output end of the operational amplifier op2 is connected with the reverse input end of the operational amplifier op3 through the resistor R7, one end of the resistor R4 is connected with the output end of the operational amplifier op2, the other end of the resistor R4 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the output end of the operational amplifier op1, the reverse input end of the resistor R6 is connected with the output end of the resistor R9, and the output end of the operational amplifier op3 is connected with the other end of the resistor R9.
Preferably, the LVI detection circuit comprises a triode Q, a capacitor C2, a capacitor C3, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R15, wherein the base electrode of the triode Q is connected with one end of the capacitor C2, the other end of the capacitor C2 is connected with the output end of the power supply detection through the resistor R11, the output end of the power supply detection outputs LVI signals 1 to the processor through the resistor R15, one end of the capacitor C2 is grounded through the resistor R13, the other end of the capacitor C2 is grounded through the resistor R12, the emitter of the triode Q is grounded, the collector of the triode Q is connected with the processor, one end of the resistor R14 is connected with the collector of the triode Q, the LVI signals 2 are output to the processor, the other end of the resistor R14 is connected with the VCCPU, one end of the capacitor C3 is connected with the collector of the triode Q, and the other end of the capacitor C3 is grounded.
Preferably, the switching circuit comprises a diode D1 and a diode D2, the power grid is connected with the processor through the diode D1, and the anode of the lithium battery is connected with the processor through the diode D2.
Preferably, the housing includes an upper housing and a lower housing, the lithium battery is disposed on the upper housing or the lower housing or a circuit board disposed on the upper housing or the lower housing.
Preferably, the lithium battery is arranged on the circuit board, the circuit board is arranged on the upper shell, a cavity for accommodating the circuit board is arranged on the upper shell, an opening is formed in one end of the cavity, a sealing plate with a sealing opening is connected to the circuit board, the sealing plate is detachably arranged on the circuit board, and a through hole communicated with the lower shell is formed in the other end of the cavity.
Preferably, a fixing column for fixing the circuit board is arranged in the cavity, and the circuit board is detachably arranged on the fixing column through a first screw.
Preferably, the circuit board is provided with a connecting column for connecting the sealing plate, and the sealing plate is detachably arranged on the connecting column through a second screw.
Preferably, the sealing plate is provided with a connecting sleeve propped against the circuit board, and the first screw is arranged in the connecting sleeve.
Preferably, the temperature sensor is mounted on a circuit board or an upper or lower housing.
In summary, the invention has the advantages that: the LVI detection circuit is used for checking a power grid power supply, the processor controls the switching circuit to switch the power supply mode of the electric energy meter according to the signal of the LVI detection circuit, the passivation working mode of the lithium battery can also be switched, specifically, when the electric energy meter is powered by the power grid power supply, the passivation of the lithium battery can be realized in advance, the phenomenon that the lowest hysteresis voltage phenomenon occurs when the battery initially supplies power and causes abnormal power supply of the electric energy meter and internal clock errors occurs is avoided, when the electric energy meter is powered by the lithium battery, the passivation can be reasonably performed through a multi-frequency triggering mode, under the condition that the passivation is met, the consumption of capacity of the lithium battery due to the passivation is effectively reduced, the service life of the lithium battery is reasonably prolonged, the optimal service life matching of the lithium battery and the electric energy meter is realized, and secondly, the temperature information processor for acquiring the lithium battery in real time through the temperature sensor calculates the discharge current when the lithium battery is passivated according to the actual temperature information of the lithium battery, and the passivation layer grows faster due to the temperature characteristic of the lithium battery, so that a more compact crystal is formed. The internal resistance of the lithium battery is increased additionally, so that the processor can calculate the discharge current of the lithium battery during passivation according to different temperatures of the lithium battery, trigger the PWM pulse discharge circuit to perform discharge treatment on the lithium battery, and simultaneously, the current detection circuit can detect and collect the discharge current of the lithium battery during passivation in real time, the passivation state of the lithium battery is judged according to the magnitude of the discharge current, and the collected signal is returned to the processor, the processor receives the signal to enable the lithium battery to work in the critical state of passivation and passivation, on one hand, the occurrence of complete passivation of the lithium battery can be prevented, on the other hand, the passivation characteristic of the lithium battery is reasonably utilized, the service life of the lithium battery is furthest exerted, finally, the storage chip records the passivation event of the lithium battery, and the processor can adjust and optimize the passivation removal period according to the stored parameters, so that the passivation automatic management of the lithium battery is realized, and the analysis of subsequent management personnel is also facilitated.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of an electric energy meter capable of preventing battery passivation according to the present invention;
FIG. 2 is a schematic diagram of a circuit board according to the present invention;
FIG. 3 is a schematic circuit diagram of a circuit board according to the present invention;
fig. 4 is a schematic view of the connection of the sealing plate to the circuit board in the present invention.
Reference numerals:
1 casing, 2 lithium cell, 3 circuit boards, 4 treater, 5LVI detection circuit, 6PWM pulse discharge circuit, 7 electric current detection circuit, 8 switching circuit, 9 memory chip, 10 temperature sensor, 11RTC clock module, 12 measurement module, 13 upper casing, 14 lower casing, 15 cavitys, 16 shrouding, 17 fixed column, 18 first screw, 19 spliced pole, 20 second screw, 21 adapter sleeve, 22 electric wire netting power, 23 output, 24 converting circuit, 25 through-holes.
Detailed Description
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, an electric energy meter capable of preventing battery passivation comprises a shell 1, a circuit board 3 and a lithium battery 2 arranged in the shell, wherein the circuit board 3 is arranged in the shell, a converting circuit 24 connected with a power grid 22 is arranged on the circuit board 3, the converting circuit 24 converts 220V voltage of the power grid 22 into 5V voltage, the converting circuit 24 is in the prior art, the embodiment is not described in detail, the circuit board 3 comprises a processor 4, the processor 4 adopts an ARM processor 4 of home-made complex denier microelectronic FM33a048, an LVI detection circuit 5 for detecting voltage of the power grid 22, a PWM pulse discharging circuit 6 for discharging the lithium battery 2, a current detection circuit 7 for detecting discharging current when the lithium battery 2 is de-passivated, a switching circuit 8 for controlling and switching power grid 22 and lithium battery 2, the LVI detection circuit 5, the current detection circuit 7, the PWM pulse discharge circuit 6, the switching circuit 8 and the storage chip 9 are all connected with the processor 4, the current detection circuit 7 is connected with the PWM pulse discharge circuit 6, the processor 4 is connected with a temperature sensor 10 for collecting the temperature in the shell, the processor 4 receives the temperature signal of the temperature sensor 10 to calculate the discharge current of the PWM pulse discharge circuit 6, the PWM pulse discharge circuit 6 is controlled to perform discharge treatment on the lithium battery 2, the current detection circuit 7 collects the discharge current to judge the passivation state of the passivation film of the lithium battery 2 and sends signals to the processor 4, the processor 4 receives the signals of the LVI detection circuit 5 to switch the passivation working mode of the lithium battery 2, the depassivation working mode comprises depassivation of the lithium battery 2 when the electric energy meter is powered by the power grid power supply 22 and depassivation of the lithium battery 2 when the electric energy meter is powered by the lithium battery 2, wherein the circuit board 3 is provided with an RTC clock module 11 and a metering module 12, the RTC clock module 11 is RX-8025SA, and the RTC clock module 11 and the metering module 12 are both connected with the processor 4.
The power grid power supply 22 is checked through the LVI detection circuit 5, the processor 4 controls the switching circuit 8 to switch the power supply mode of the electric energy meter according to the signal of the LVI detection circuit 5, the passivation working mode of the lithium battery 2 can also be switched, specifically, when the electric energy meter is powered by the power grid power supply 22, the passivation of the lithium battery 2 can be realized in advance, the phenomenon that the electric energy meter is abnormally powered when the battery is initially powered is avoided, the phenomenon that the internal clock is wrong is caused, when the electric energy meter is powered by the lithium battery 2, the passivation can be reasonably performed through a multi-frequency triggering mode, under the condition that the passivation is satisfied, the consumption of capacity of the lithium battery 2 caused by the passivation is effectively reduced, the service life of the lithium battery 2 is reasonably prolonged, the optimal service life matching of the lithium battery 2 and the electric energy meter is realized, secondly, the temperature information processor 4 which collects the lithium battery 2 in real time through the temperature sensor 10 calculates the discharge current when the lithium battery 2 is passivated according to the actual temperature information of the lithium battery 2, and the more compact crystal is formed due to the temperature characteristics of the lithium battery 2, the temperature is high, the passivation layer grows faster. The internal resistance of the battery is increased additionally, so that the processor 4 can calculate the discharge current of the lithium battery 2 during passivation according to different temperatures of the lithium battery 2, trigger the PWM pulse discharge circuit 6 to perform discharge treatment on the lithium battery 2, and at the same time, the current detection circuit 7 can detect and collect the discharge current of the lithium battery 2 during passivation in real time, the passivation state of the lithium battery 2 is judged according to the magnitude of the discharge current, and the collected signal is returned to the processor 4, the processor 4 receives the signal and enables the lithium battery 2 to work in the critical state of passivation and passivation, on one hand, the occurrence of complete passivation of the lithium battery 2 can be prevented, on the other hand, the passivation characteristic of the lithium battery 2 is reasonably utilized, the service life of the lithium battery 2 is furthest exerted, finally, the passivation period of the lithium battery 2 is optimized through the record of the storage chip 9, the processor 4 can be adjusted according to the stored parameters, the passivation automatic management of the lithium battery 2 is realized, and the analysis of subsequent management personnel is facilitated.
The PWM pulse discharging circuit 6 comprises a capacitor C1, a resistor R2, a resistor R3 and a high-speed MOS tube, wherein the grid electrode of the high-speed MOS tube is connected with the processor 4 through the resistor R1, the source electrode of the high-speed MOS tube is grounded, the capacitor C1 is connected in parallel with the two ends of the resistor R1, one end of the capacitor C1 is grounded through the resistor R2, and the drain electrode of the high-speed MOS tube is connected with the positive electrode of the lithium battery 2 through the resistor R3; the current detection circuit 7 comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, an operational amplifier op1, an operational amplifier op2 and an operational amplifier op3, wherein the forward input end of the operational amplifier op1 is connected with one end of the resistor R3, the forward input end of the operational amplifier op2 is connected with the other end of the resistor R3, the output end 23 of the operational amplifier op1 is grounded through the resistor R8 and the resistor R10, the forward input end of the operational amplifier op3 is connected with one end connected with the resistor R10, the output end 23 of the operational amplifier op2 is connected with the reverse input end of the operational amplifier op3 through the resistor R7, one end of the resistor R4 is connected with the output end 23 of the operational amplifier op2, the other end of the resistor R4 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the output end 23 of the operational amplifier op1, the reverse input end of the resistor R9 is connected with the resistor R3, and the other end of the resistor R9 is connected with the output end of the operational amplifier op 3.
The LVI detection circuit 5 comprises a triode Q, a capacitor C2, a capacitor C3, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R15, wherein the base electrode of the triode Q is connected with one end of the capacitor C2, the other end of the capacitor C2 is connected with the output end 23 of a power grid power supply 22 through the resistor R11, the output end 23 of the power grid power supply 22 is connected with the output end 1 of the power grid through the resistor R15 to the processor 4, one end of the capacitor C2 is grounded through the resistor R13, the other end of the capacitor C2 is grounded through the resistor R12, the emitter of the triode Q is grounded, the collector of the triode Q is connected with the processor 4, one end of the resistor R14 is connected with the collector of the triode Q, the other end of the resistor R14 is connected with the VCCPU, one end of the capacitor C3 is connected with the collector of the triode Q, the other end of the capacitor C3 is grounded, the switching circuit 8 comprises a diode D1 and a diode D2, the power supply 22 is connected with the power grid 2 through the diode D4, and the power grid 2 is connected with the power grid 2 through the diode 4, and the power meter is fast switched to the power supply 4, and the power supply 4 is fast, and the power supply 4 is switched to the power meter is in a power supply mode, and the power supply 2 is fast switched to the power supply 2 is in a power supply mode, and the power supply mode is fast, and the power supply mode is realized.
The lithium battery 2 is arranged on the upper shell 13 or the lower shell 14 or the circuit board 3, the circuit board 3 is arranged on the upper shell 13 or the lower shell 14, the shell is arranged to be the upper shell 13 and the lower shell 14, the lithium battery 2 and the circuit board 3 are conveniently and fixedly arranged on the circuit board 3, the whole shell is conveniently produced, the subsequent circuit board 3 and the lithium battery 2 are conveniently replaced, the lithium battery 2 is arranged on the circuit board 3, the circuit board 3 is arranged on the upper shell 13, the upper shell 13 is provided with a cavity 15 for accommodating the circuit board 3, one end of the cavity 15 is provided with an opening, the circuit board 3 is connected with a sealing plate 16 with a sealing opening, the sealing plate 16 is detachably arranged on the circuit board 3, the other end of the cavity 15 is provided with a through hole 25 communicated with the lower shell 14, the lithium battery 2 is arranged on the circuit board 3, the lithium battery 2 and the PWM pulse discharging circuit 6 can be conveniently and integrally arranged, the wiring between the circuit board 3 and the lithium battery 2 is simplified, the electric energy meter is quickly replaced by arranging the cavity 15 on the upper shell 13, and the circuit board 3 is quickly replaced by arranging the cavity 15 in the cavity 13, and the circuit board can be quickly replaced by adopting the cavity 13 when the cavity 13 is replaced by adopting the cavity 13, and the cavity 13 is quickly replaced when the cavity is replaced by the cavity 13, and the cavity is quickly replaced by the cavity is replaced by the cavity 3, and the cavity is in the cavity 3, the cavity is normally when the cavity is replaced by the cavity 3.
The cavity 15 is internally provided with a fixing column 17 for fixing the circuit board 3, the circuit board 3 is detachably arranged on the fixing column 17 through a first screw 18, the fixing column 17 can play a certain role in supporting the circuit board 3, the installation stability of the circuit board 3 is ensured, the first screw 18 is convenient to install and detach, the circuit board 3 is provided with a connecting column 19 for connecting a sealing plate 16, the sealing plate 16 is detachably arranged on the connecting column 19 through a second screw 20, the sealing plate 16 can be quickly arranged on the circuit board 3, the sealing plate 16 with an opening is realized, the sealing plate 16 is detachably arranged on the connecting column 19 through the second screw 20, the second screw 20 is convenient to install and detach, the connection is reliable, the maintenance personnel can overhaul conveniently, the contact area between the connecting column 19 and the sealing plate 16 can be enlarged, the installation stability of the sealing plate 16 is ensured, the sealing plate 16 is provided with the connecting sleeve 21 propped against the circuit board 3, the first screw 18 is arranged in the connecting sleeve 21, the connecting sleeve 21 is arranged, when the sealing plate 16 is arranged on the connecting column 19, the limiting function of the first screw 18 can be realized through the connecting sleeve 21, shaking and separation of the first screw 18 after the installation are avoided, the fixed quality of the circuit board 3 is ensured, the temperature sensor 10 is arranged on the circuit board 3 or the upper shell 13 or the lower shell 14, the installation position of the temperature sensor 10 can be set according to electric energy meters of different types, and the accurate acquisition of temperature signals of the lithium battery 2 is ensured, so that the passivation removing quality of the lithium battery 2 is improved, the temperature sensor 10 in the embodiment is preferentially arranged on the circuit board 3, and the connecting structure of the temperature sensor 10 and the processor 4 is simplified.
The above embodiments are merely illustrative embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.
Claims (9)
1. The utility model provides an electric energy meter that can prevent battery passivation, includes casing and the lithium cell of setting in the casing, its characterized in that: the lithium battery passivation device comprises a shell, and is characterized by further comprising a circuit board, wherein the circuit board is arranged in the shell and comprises a processor, a LVI detection circuit used for detecting and collecting power supply voltage of a power grid, a PWM pulse discharge circuit used for discharging a lithium battery, a current detection circuit used for detecting and collecting discharge current when the lithium battery is in passivation, a switching circuit used for controlling and switching power supply of the power grid and power supply of the lithium battery, and a storage chip used for recording passivation events of the lithium battery, the LVI detection circuit, the current detection circuit, the PWM pulse discharge circuit, the switching circuit and the storage chip are all connected with the processor, the current detection circuit is connected with the PWM pulse discharge circuit, a temperature sensor used for collecting temperature in the shell is connected with the processor, the processor receives a temperature signal of the temperature sensor to calculate discharge current of the PWM pulse discharge circuit, controls the PWM pulse discharge circuit to perform discharge treatment on the lithium battery, the current detection circuit collects the discharge current to judge passivation state of a passivation film of the lithium battery and sends signals to the processor, the processor receives signals of the LVI detection circuit to switch passivation working modes of the lithium battery, the circuit board is provided with a clock and a measuring module are connected with the RTC module;
the PWM pulse discharging circuit comprises a capacitor C1, a resistor R2, a resistor R3 and a high-speed MOS tube, wherein the grid electrode of the high-speed MOS tube is connected with the processor through the resistor R1, the source electrode of the high-speed MOS tube is grounded, the capacitor C1 is connected in parallel with the two ends of the resistor R1, one end of the capacitor C1 is grounded through the resistor R2, and the drain electrode of the high-speed MOS tube is connected with the anode of the lithium battery through the resistor R3; the current detection circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, an operational amplifier op1, an operational amplifier op2 and an operational amplifier op3, wherein the forward input end of the operational amplifier op1 is connected with one end of the resistor R3, the forward input end of the operational amplifier op2 is connected with the other end of the resistor R3, the output end of the operational amplifier op1 is grounded through the resistor R8 and the resistor R10, the forward input end of the operational amplifier op3 is connected with one end connected with R10, the output end of the operational amplifier op2 is connected with the reverse input end of the operational amplifier op3 through the resistor R7, one end of the resistor R4 is connected with the output end of the operational amplifier op2, the other end of the resistor R4 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with the output end of the operational amplifier op1, the reverse input end of the resistor R6 is connected with the output end of the resistor R9, and the output end of the operational amplifier op3 is connected with the other end of the resistor R9.
2. An electric energy meter capable of preventing battery passivation according to claim 1, wherein: the LVI detection circuit comprises a triode Q, a capacitor C2, a capacitor C3, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R15, wherein the base electrode of the triode Q is connected with one end of the capacitor C2, the other end of the capacitor C2 is connected with the output end of the power supply detection through the resistor R11, the output end of the power supply detection is connected with the output end of the power supply detection through the resistor R15 to output LVI signals 1 to the processor, one end of the capacitor C2 is grounded through the resistor R13, the other end of the capacitor C2 is grounded through the resistor R12, the emitter of the triode Q is grounded, the collector of the triode Q is connected with the processor, one end of the resistor R14 is connected with the collector of the triode Q to output LVI signals 2 to the processor, the other end of the resistor R14 is connected with the VCCPU, one end of the capacitor C3 is connected with the collector of the triode Q, and the other end of the capacitor C3 is grounded.
3. An electric energy meter capable of preventing battery passivation according to claim 1, wherein: the switching circuit comprises a diode D1 and a diode D2, the power grid is connected with the processor through the diode D1, and the anode of the lithium battery is connected with the processor through the diode D2.
4. An electric energy meter capable of preventing battery passivation according to claim 1, wherein: the shell comprises an upper shell and a lower shell, the lithium battery is arranged on the upper shell or the lower shell or a circuit board, and the circuit board is arranged on the upper shell or the lower shell.
5. An electric energy meter capable of preventing battery passivation according to claim 4, wherein: the lithium battery is arranged on the circuit board, the circuit board is arranged on the upper shell, a cavity for accommodating the circuit board is arranged on the upper shell, an opening is formed in one end of the cavity, a sealing plate with a sealing opening is connected to the circuit board, the sealing plate is detachably arranged on the circuit board, and a through hole communicated with the lower shell is formed in the other end of the cavity.
6. An electric energy meter capable of preventing battery passivation according to claim 5, wherein: the cavity is internally provided with a fixing column for fixing the circuit board, and the circuit board is detachably arranged on the fixing column through a first screw.
7. An electric energy meter capable of preventing battery passivation according to claim 6, wherein: the circuit board is provided with a connecting column for connecting the sealing plate, and the sealing plate is detachably arranged on the connecting column through a second screw.
8. An electric energy meter capable of preventing battery passivation according to claim 7, wherein: and the sealing plate is provided with a connecting sleeve propped against the circuit board, and the first screw is arranged in the connecting sleeve.
9. An electric energy meter capable of preventing battery passivation according to claim 1, wherein: the temperature sensor is mounted on the circuit board or the upper or lower housing.
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| CN101277741A (en) * | 2005-10-06 | 2008-10-01 | 3M创新有限公司 | Powered air purifying respirator with battery passivation sensing/correction and method therefor |
| CN105140576A (en) * | 2015-07-22 | 2015-12-09 | 北京嘉捷恒信能源技术有限责任公司 | System and method for preventing lithium thionyl chloride battery from being passivated |
| CN111584959A (en) * | 2020-05-22 | 2020-08-25 | 广东电网有限责任公司 | Lithium battery passivation detection and activation circuit, method and device |
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2021
- 2021-06-25 CN CN202110710749.5A patent/CN113675907B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277741A (en) * | 2005-10-06 | 2008-10-01 | 3M创新有限公司 | Powered air purifying respirator with battery passivation sensing/correction and method therefor |
| CN105140576A (en) * | 2015-07-22 | 2015-12-09 | 北京嘉捷恒信能源技术有限责任公司 | System and method for preventing lithium thionyl chloride battery from being passivated |
| CN111584959A (en) * | 2020-05-22 | 2020-08-25 | 广东电网有限责任公司 | Lithium battery passivation detection and activation circuit, method and device |
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