CN103311899A - Self-protection method and circuit for power lithium-ion battery pack - Google Patents
Self-protection method and circuit for power lithium-ion battery pack Download PDFInfo
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Abstract
The invention relates to a self-protection method and circuit for a power lithium-ion battery pack. The self-protection method includes independently judging the operating state of a single cell, allowing the single cell to charge and discharge with the battery pack under no protection, allowing the single cell to quit charging and discharging of the battery pack under protection, and allowing the battery pack to continue charging and discharging after current is bypassed. The self-protection circuit comprises a functional module, a booster module, a reference voltage module, a voltage comparison module, a temperature protection module and a battery pack charge module, wherein the voltage comparison module and the temperature protection module control the on and off states of two power field-effect transistor pairs of the functional module so as to enable the single cell to engage with or quit charging and discharging of the battery pack. The self-protection method and circuit is applicable to self-protection of power lithium-ion battery packs, and has the advantages that the requirement for uniformity of single cells is lowered, reversible capacity of the battery packs is increased and the lifetimes of the battery packs are prolonged.
Description
Technical field
The present invention relates to a kind of self-protection method and circuit that improves dynamical lithium-ion battery packs active volume and life-span, it is characterized in that single battery by automatic participation or withdraw from battery pack discharge and recharge to carry out self-shield.
Background technology
At present, the lithium ion battery group is being applied to electric tool, electric motor car etc. gradually, and this power battery pack is in series by the polylith single battery.But because the single battery manufacturing process is unstable, the single battery capacity has difference, and the single battery of capacity minimum has limited actual capacity and the life-span of battery pack when discharging and recharging.At first, in the charge and discharge process, electrode material is because of repeatedly excessive expansion and dwindling of super-charge super-discharge, thereby loosening even come off quickly, reduced the reversible capacity of electro-chemical activity and battery, and the little easier cumulative capacity loss of battery of capacity.Secondly, when a batteries capacity exhausted, battery pack was just stopped using, and had reduced the actual serviceability of battery pack.Again, after single battery had discharged, the reversible lithium ion of negative pole all took off embedding, continued discharge and caused then in the electrolyte that lithium ion embeds positive electrode or separates out on the positive electrode surface, and this moment, lithium salts and SEI film began to decompose.Especially later stage carrier depletion, cell resistance increases greatly, and voltage is rapidly accumulation on this batteries, and electrolyte begins to decompose, and simultaneous temperature also raises, and makes single battery face the danger of inflatable blast.In addition, when charging and discharging the TV university electric current by battery pack, lithium ion is the intercalation electrode material in time, separates out at the electrode material interface, and forms dendrite, has reduced battery capacity, and short circuit risk is arranged.Electrolyte gasification under the high temperature also can make single battery face the danger of inflatable blast.Therefore need the protection of battery pack protective circuit.
The Wu Fen of Hubei University Of Technology Master's thesis in 2012 discloses:
Present protective circuit generally comprises a protection IC and two power field effect pipes.Wherein protect IC in order to detect battery status, when the abnormal situation, cut off the battery charging and discharging loop with the protection battery by turn-offing corresponding power field effect pipe.
Jiang Xinhua of the Chinese Academy of Sciences Master's thesis in 2005 discloses:
Protective circuit will realize 5 functions: overcharge, overdischarge, excess current control, short-circuit protection and over-temperature protection.Wherein, over-charge protective is that cell voltage enters overvoltage protection when surpassing upper voltage limit, cuts off the battery charge circuit with the safety of safeguards system.Cross prevention is when battery is in under-voltage condition, by under-voltage signal of voltage detection module output, turn-offs the discharge loop of battery with the safety of safeguards system.
Patent 201010613992.7 discloses:
Present battery set charge/discharge result shows, the single battery of lithium ion battery group can circulate 3000 times, but battery pack can only circulate 500 times, and lack of uniformity is to reduce the principal element of battery life.Conventional method is to form battery pack by the close cell of strict selection capacity.
The shortcoming of existing battery protecting circuit is: the one, and the active volume of battery pack depends on the single battery of capacity minimum; the detection of battery pack is that single battery is detected; but; control to battery pack is by total current is controlled; voltage overcharges or mistake is put in case certain single battery occurs; just cut off the current circuit of whole battery pack; thereby can not continue to discharge and recharge to other single batteries of battery pack; the capacity of battery pack can not take full advantage of, and has reduced the actual active volume of battery pack.The 2nd, the life-span of battery pack is depended on the single battery of capacity minimum, and the single battery of capacity minimum is large owing to discharging and recharging the degree of depth, and volume lowering speed is fast, prescribes a time limit under available when this single battery volume lowering, and battery pack just can not continue to use.
Summary of the invention
Technical problem to be solved by this invention is to overcome existing protective circuit for lithium ion power battery single battery can not withdraw the deficiency of carrying out self-shield from battery set charge/discharge; the implementation method and the circuit that continue the single battery self-protection function under the charge status in battery pack are provided; reduce battery pack to the conforming requirement of single battery, increased active volume and the life-span of battery pack.
The present invention addresses the above problem the technical scheme of taking:
A kind of dynamical lithium-ion battery packs self-protection method the steps include:
When (1) battery pack begins to discharge and recharge, in the certain hour, start module and make all single batteries start the non-protected mode of pressure, transfer afterwards the self-shield pattern to.
(2) boost module carries out the DC/DC conversion to single battery, and the high level of stable output is powered to reference voltage module and voltage comparison module;
The bound of reference voltage module output battery normal working voltage:
Voltage comparison module is compared with the bound reference voltage to cell voltage, the output logic level, and then the control functional module is carried out self-shield to single battery.
When (3) functional module was received the normal logic level of voltage, single battery participated in discharging and recharging of battery pack; When receiving the logic level of voltage abnormality, then single battery withdraws from discharging and recharging of battery pack, and electric current is bypassed, and battery pack continues to discharge and recharge.
Described startup module is made of photoelectrical coupler and time control circuit, and in the certain hour of being determined by time control circuit, the output of photoelectrical coupler is forced the logic level of each single battery of control, forces non-protected mode thereby enter.
Described functional module, at least by power field effect pipe of single battery difference series and parallel connections, the break-make of power field effect pipe is controlled by logic level, two loops the on off operating mode of power field effect pipe be opposite, thereby the control single battery participates in or deviates from discharging and recharging of battery pack.
Each single battery has comprised the circuit of functional module, boost module, reference voltage module, voltage comparison module and startup module at least.
A kind of battery pack self-protection circuit who realizes this self-protection method is characterized in that also being provided with single battery temperature protection module, batteries charging module; Functional module links to each other with boost module; boost module links to each other with the reference voltage module; the reference voltage module links to each other with voltage comparison module; voltage comparison module, startup module link to each other with functional module with single battery temperature protection module simultaneously, and the batteries charging module links to each other with battery anode with the drain electrode of battery pack negative pole series connection power field effect pipe.
Described functional module comprises single battery V1, power field effect pipe Q11, power field effect pipe Q12, resistance R 1; Single battery V1 positive pole is connected to resistance R 1, the drain electrode of another termination power field effect pipe Q12 of resistance R 1, the source electrode of power field effect pipe Q12 connects the drain electrode of power field effect pipe Q11, it is anodal that the drain electrode of power field effect pipe Q11 connects next batteries, the source electrode order batteries V1 negative pole of power field effect pipe Q11.
Described boost module comprises DC/DC converter U2, capacitor C 21, electrochemical capacitor C22, C23, resistance R 21, R22, R23, R24, inductance L 2, diode D2; The model of DC/DC converter U2 is MC34063, the pin 1 of U2 connects inductance L 2 and diode D2 is anodal, the other end of inductance L 2 links to each other with pin 7, pin 2 and pin 4 simultaneously order batteries negative poles, pin 3 connects capacitor C 21, capacitor C 21 order batteries negative poles, pin 5 connecting resistance R21 and resistance R 22, the other end order batteries negative pole of resistance R 21, another termination diode cathode of resistance R 22, pin 6 connects anode, pin 7 connecting resistance R23, the other end of resistance R 23 links to each other with single battery is anodal, pin 8 connecting resistance R24, and the other end of resistance R 24 links to each other with pin 7, the anodal order batteries of electrochemical capacitor C22 is anodal, negative pole order batteries negative pole, the positive pole of electrochemical capacitor C23 connects diode D2 negative pole, negative pole order batteries negative pole.
The DC/DC transducer can be changed to other models.
Described reference voltage module comprises voltage stabilizing a reference source U31, U32, resistance R 311, R312, R313, R321, R322, R323, electrochemical capacitor C31, C32; The model of voltage stabilizing a reference source is TL431, high level connecting resistance R311 and the R321 of boost module output, the other end connecting resistance R312 of resistance R 311, voltage stabilizing a reference source U31 anode, electrochemical capacitor C31 positive pole, resistance R 312 another termination voltage stabilizing a reference source U31 are with reference to the utmost point and resistance R 313, resistance R 313, voltage stabilizing a reference source U31 negative electrode, simultaneously order of electrochemical capacitor C31 negative pole batteries negative pole.The other end connecting resistance R322 of resistance R 321, voltage stabilizing a reference source U32 anode, electrochemical capacitor C32 positive pole, resistance R 322 another termination voltage stabilizing a reference source U32 are with reference to the utmost point and resistance R 323, resistance R 323, voltage stabilizing a reference source U32 negative electrode, simultaneously order of electrochemical capacitor C32 negative pole batteries negative pole.
Described voltage comparison module comprises integrated operational amplifier U41, two integrated NAND gate U42, resistance R 41, R42, R43, R44, R45; The model of integrated operational amplifier U41 is LM358, the pin 1 of integrated operational amplifier U41 connects first input and the resistance R 41 of first NAND gate U42A, another termination pin 3 of resistance R 41, pin 2 connects pin 5, it is anodal that pin 3 meets electrochemical capacitor C31, it is upper voltage limit benchmark output, pin 4 order batteries negative poles, pin 5 connecting resistance R42 and resistance R 43, the other end of resistance R 42 and resistance R 43 connects respectively pin 7 and single battery is anodal, and it is anodal that pin 6 meets electrochemical capacitor C32, i.e. lower voltage limit benchmark output, pin 7 connects second input of first NAND gate U42A, and pin 8 connects boost module output diode D2 negative pole; Two inputs of second NAND gate of output termination of first NAND gate U42A and resistance R 44, the grid of another termination series connection power field effect pipe Q12 of resistance R 44, the output connecting resistance R45 of second NAND gate, the grid of another termination power field effect pipe Q11 in parallel of resistance R 45.
Described startup module comprises the connection in series-parallel of each photoelectrical coupler input, 555 timers, switch J5, reed switch relay K5, electrochemical capacitor C51, capacitor C 52, resistance R 51, R52; Per 10 photoelectrical coupler inputs series connection, each series load is in parallel, the negative pole of photoelectrical coupler connection in series-parallel load connects battery cathode, the positive pole of connection in series-parallel load meets reed switch relay K5, the pin 3 of another termination 555 timers of K5, the boost level of minor details battery connects the switch of switch J5 and reed switch relay K5, the other end of the switch of switch J5 and reed switch relay K5 connects the pin 8 of 555 timers and the positive pole of electrochemical capacitor C51 simultaneously, the pin 4 of 555 timers connects the negative pole of electrochemical capacitor C51, the negative pole connecting resistance R51 of electrochemical capacitor C51, another termination battery cathode of resistance R 51, the pin 2 connecting resistance R52 of 555 timers, another termination battery cathode of resistance R 52, the pin 5 of 555 timers connects capacitor C 52, another termination battery cathode of capacitor C 52, the pin 1 of 555 timers connects battery cathode, and each photoelectric coupler output end only connects collector and emitter.
Described single battery temperature protection module comprises cryogenic temperature switch J61, high-temperature temperature switch J62, heating plate resistance R 61, resistance R 62; In normal temperature range, the two all is open-circuit condition, the drain electrode of series connection power field effect pipe Q11 connects heating plate resistance R 6, another termination cryogenic temperature switch J61 of heating plate resistance R 6, the other end order batteries of cryogenic temperature switch J61 is anodal, high-temperature temperature switch J62, the diode cathode of a termination boost module output, other end connecting resistance R62, another termination power field effect pipe Q12 in parallel grid of resistance R 62.
Described batteries charging module comprises bridge rectifier D 71, voltage stabilizing didoe D72, electrochemical capacitor C71, C73, capacitor C 72, C74, resistance R 71, R72, R74, potentiometer R73, triode Q71, Q72, Q73, Q74, adjustable reference source U7; The two ends of alternating current connect respectively pin 2 and the pin 3 of bridge rectifier D 71, the pin 1 of bridge rectifier D 71 meets electrochemical capacitor C71, the positive pole of C73 and capacitor C 72, C74, and resistance R 71, voltage stabilizing didoe D75 and battery anode, the pin 4 of another termination bridge rectifier D 71 of the negative pole of electrochemical capacitor C71 and capacitor C 72, the other end connecting resistance R72 of resistance R 71 and triode Q73 base stage, resistance R 72 connects the negative pole of electrochemical capacitor C71, the series connection power field effect pipe source electrode of another termination battery pack negative pole of the negative pole of electrochemical capacitor C73 and capacitor C 74. voltage stabilizing didoe D75 connects triode Q71 collector electrode, triode Q71 base stage connecting resistance R74, the negative pole of another termination electrochemical capacitor C73 of resistance R 74, triode Q71 emitter connects triode Q72 base stage, triode Q72 collector electrode connects the negative pole of electrochemical capacitor C73, triode Q72 emitter connects triode Q73 collector electrode and triode Q74 collector electrode, triode Q73 base stage connects the anode of adjustable reference source U7, the model of adjustable reference source U7 is TL431, triode Q73 emitter connects triode Q74 base stage, triode Q74 base stage meets the reference utmost point and the potentiometer R73 of adjustable reference source U7, the negative electrode of another termination adjustable reference source U7 of potentiometer R73 and the negative pole of electrochemical capacitor C71.
The invention has the beneficial effects as follows: battery pack reduces the requirement of single battery Capacity uniformity; The active volume of battery pack no longer is subject to the single battery of capacity minimum, and each single battery can discharge and recharge more fully; The life-span of battery pack also no longer is subject to the single battery of capacity minimum, and the single battery of capacity minimum can isolate from battery pack by the form of current bypass and carry out self-shield, thereby reduces capacity attenuation speed.
Description of drawings
Fig. 1 is battery pack self-protection circuit schematic diagram
Fig. 2 is the example circuit diagram of battery pack self-protection circuit single battery part
Fig. 3 is that the battery pack self-protection circuit starts the module instance circuit diagram
Fig. 4 is battery pack self-protection circuit batteries charging module instance circuit diagram
Embodiment
When battery begins to discharge and recharge, the switch J5 that starts as shown in Figure 3 module is closed, the pin 3 output high level of 555 timers, and electric current is through reed switch relay K5, the relay closes self-locking, circuit by the connection in series-parallel combination of each photoelectrical coupler input, makes the output conducting of each photoelectrical coupler subsequently, and making logic level is low level, the conducting of series connection power field effect pipe, power field effect pipe cut-off in parallel, each single battery enter forces non-protected mode, and timer begins regularly simultaneously; Behind the certain hour, pin 3 output low levels of 555 timers, electric current no longer flows through reed switch relay and photoelectrical coupler, and reed switch relay disconnects, and the non-protected mode of the pressure of photoelectrical coupler is cancelled, and makes each single battery change the self-shield pattern over to.
Battery plus-negative plate to the boost module power supply, is the 12V high level of the DC/DC transducer of MC34063 and the boost module stable output that peripheral element consists of by model directly, and the electric current bottoming that wherein drives the boost module that starts module is not less than 100mA.The reference voltage module changes the voltage of boost module, obtains the bound benchmark of battery protection voltage, the upper limit benchmark of U31 anode output battery protection voltage, the lower limit benchmark of U32 anode output battery protection voltage.
When cell voltage is higher than upper limit reference voltage, operational amplifier U41A output output low level, operational amplifier U41B output output high level is behind NAND gate operational amplifier U42A, obtain high level, make power field effect pipe Q12 in parallel conducting, behind NAND gate operational amplifier U42B, obtain low level, make series connection power field effect pipe Q11 cut-off, so single battery isolates from battery pack, stop to discharge and recharge, charging and discharging currents is bypassed; When cell voltage is lower than the lower limit reference voltage, operational amplifier U41A output output high level, operational amplifier U41B output output low level is behind NAND gate operational amplifier U42A, obtain high level, make power field effect pipe Q12 in parallel conducting, behind NAND gate operational amplifier U42B, obtain low level, make series connection power field effect pipe Q11 cut-off, so single battery isolates from battery pack, stop to discharge and recharge, charging and discharging currents is bypassed; When cell voltage is lower than upper limit reference voltage and is higher than the lower limit reference voltage, the battery normal operation, operational amplifier U41A output and operational amplifier U41B output are exported high level simultaneously, behind NAND gate operational amplifier U42A, obtain low level, make power field effect pipe Q12 cut-off in parallel, behind NAND gate operational amplifier U42B, obtain high level, make series connection power field effect pipe Q11 conducting, so single battery participates in discharging and recharging of battery pack.
When battery temperature was lower than the lowest temperature of cryogenic temperature switch J61 setting, cryogenic temperature switch J61 was closed, and the battery of normal operation heats heating plate resistance, and battery temperature is raise; When battery temperature is higher than the temperature upper limit of high-temperature temperature switch J62 setting; high-temperature temperature switch J62 is closed; the grid input high level of power field effect pipe Q12 in parallel; power field effect pipe Q12 in parallel conducting, the power field effect pipe Q11 that connects simultaneously cut-off is so single battery isolates from battery pack; stop to discharge and recharge; single battery is protected, and charging and discharging currents is bypassed, and other single batteries work on.
During charging, as shown in Figure 4, after 1 pair of alternating current of bridge rectifier D carries out rectification, obtain unsettled direct current, after electrochemical capacitor C71 and capacitor C 72 filtering, obtain metastable direct current, 72 pairs of metastable dc voltages of resistance R 71 and resistance R carry out dividing potential drop, and dividing potential drop is powered to TL431, obtains stable reference voltage.When the pressure drop of current flowing resistance R73 generation surpasses reference voltage, the TL431 conducting, voltage on the triode Q73 base stage descends rapidly, and then the resistance between the raising collector and emitter, significantly reduce so flow into the electric current of the base stage of triode Q74, triode Q74 resistance is raise, thereby suppressed the raising of electric current, through three negative feedbacks, charging current is highly stable.During charging; along with each single battery by overvoltage self-protection; the voltage of battery pack is that ladder descends; when the lower voltage of battery pack during to the dividing potential drop of bypass resistance, think that batteries charging finishes, this moment, this dividing potential drop can not conducting voltage stabilizing didoe D72; so no current flows through in the positive-negative-positive triode; triode Q72 cut-off, charge circuit disconnects, and charging stops.
Claims (9)
1. a dynamical lithium-ion battery packs self-protection method the steps include:
When (1) battery pack begins to discharge and recharge, in the certain hour, start module and make all single batteries start the non-protected mode of pressure, transfer afterwards the self-shield pattern to.
(2) boost module carries out the DC/DC conversion to single battery, and the high level of stable output is powered to reference voltage module and voltage comparison module;
The bound of reference voltage module output battery normal working voltage;
Voltage comparison module is compared with the bound reference voltage to cell voltage, the output logic level, and then the control functional module is carried out self-shield to single battery.
When (3) functional module was received the normal logic level of voltage, single battery participated in discharging and recharging of battery pack; When receiving the logic level of voltage abnormality, then single battery withdraws from discharging and recharging of battery pack, and electric current is bypassed, and battery pack continues to discharge and recharge.
2. dynamical lithium-ion battery packs self-protection method according to claim 1; it is characterized in that: the startup module described in the step (1) is made of photoelectrical coupler and time control circuit; in the certain hour of being determined by time control circuit; the output of photoelectrical coupler is forced the logic level of each single battery of control, forces non-protected mode thereby enter.
3. dynamical lithium-ion battery packs self-protection method according to claim 1; it is characterized in that: the functional module described in the step (3); at least by power field effect pipe of single battery difference series and parallel connections; the break-make of power field effect pipe is controlled by logic level, and the on off operating mode of two power field effect pipes is opposite.
4. dynamical lithium-ion battery packs self-protection method according to claim 1, it is characterized in that: each single battery has comprised the circuit of functional module, boost module, reference voltage module, voltage comparison module and startup module at least.
5. battery pack self-protection circuit who realizes self-protection method claimed in claim 1; it is characterized by and also be provided with temperature protection module, charging module: functional module links to each other with boost module; boost module links to each other with the reference voltage module; the reference voltage module links to each other with voltage comparison module; voltage comparison module, startup module link to each other with functional module with the temperature protection module simultaneously, and charging module links to each other with battery anode with the source electrode of battery pack negative pole series connection power field effect pipe.
6. self-protection circuit according to claim 5, it is characterized by: described functional module comprises single battery V1, power field effect pipe Q11, power field effect pipe Q12, resistance R 1; Single battery V1 positive pole is connected to resistance R 1, the drain electrode of another termination power field effect pipe Q12 of resistance R 1, the source electrode of power field effect pipe Q12 connects the drain electrode of power field effect pipe Q11, it is anodal that the drain electrode of power field effect pipe Q11 connects next batteries, the source electrode order batteries V1 negative pole of power field effect pipe 011.
7. self-protection circuit according to claim 5, it is characterized by: described startup module comprises the connection in series-parallel of each photoelectrical coupler input, 555 timers, switch J5, reed switch relay K5, electrochemical capacitor C51, capacitor C 52, resistance R 51, R52; Per 10 photoelectrical coupler inputs series connection, each series load is in parallel, the negative pole of photoelectrical coupler connection in series-parallel load connects battery cathode, the positive pole of connection in series-parallel load meets reed switch relay K5, the pin 3 of another termination 555 timers of K5, the boost level of minor details battery connects the switch of switch J5 and reed switch relay K5, the other end of the switch of switch J5 and reed switch relay K5 connects the pin 8 of 555 timers and the positive pole of electrochemical capacitor C51 simultaneously, the pin 4 of 555 timers connects the negative pole of electrochemical capacitor C51, the negative pole connecting resistance R51 of electrochemical capacitor C51, another termination battery cathode of resistance R 51, the pin 2 connecting resistance R52 of 555 timers, another termination battery cathode of resistance R 52, the pin 5 of 555 timers connects capacitor C 52, another termination battery cathode of capacitor C 52, the pin 1 of 555 timers connects battery cathode, and the output of each photoelectrical coupler only connects collector and emitter.
8. self-protection circuit according to claim 5, it is characterized by: described temperature protection module comprises cryogenic temperature switch J61, high-temperature temperature switch J62, heating plate resistance R 61, resistance R 62; In normal temperature range, the two all is open-circuit condition, the drain electrode of series connection power field effect pipe Q11 connects heating plate resistance R 6, another termination cryogenic temperature switch J61 of heating plate resistance R 6, the other end order batteries of cryogenic temperature switch J61 is anodal, high-temperature temperature switch J62, the diode cathode of a termination boost module output, other end connecting resistance R62, another termination power field effect pipe Q12 in parallel grid of resistance R 62.
9. self-protection circuit according to claim 5, it is characterized by: described charging module comprises bridge rectifier D 71, voltage stabilizing didoe D72, electrochemical capacitor C71, C73, capacitor C 72, C74, resistance R 71, R72, R74, potentiometer R73, triode Q71, Q72, Q73, Q74, adjustable reference source U7; The two ends of alternating current connect respectively pin 2 and the pin 3 of bridge rectifier D 71, the pin 1 of bridge rectifier D 71 meets electrochemical capacitor C71, the positive pole of C73 and capacitor C 72, C74, and resistance R 71, voltage stabilizing didoe D75 and battery anode, the pin 4 of another termination bridge rectifier D 71 of the negative pole of electrochemical capacitor C71 and capacitor C 72, the other end connecting resistance R72 of resistance R 71 and triode Q73 base stage, resistance R 72 connects the negative pole of electrochemical capacitor C71, the series connection power field effect pipe source electrode of another termination battery pack negative pole of the negative pole of electrochemical capacitor C73 and capacitor C 74, voltage stabilizing didoe D75 connects triode Q71 collector electrode, triode Q71 base stage connecting resistance R74, the negative pole of another termination electrochemical capacitor C73 of resistance R 74, triode Q71 emitter connects triode Q72 base stage, triode Q72 collector electrode connects the negative pole of electrochemical capacitor C73, triode Q72 emitter connects triode Q73 collector electrode and triode Q74 collector electrode, triode Q73 base stage connects the anode of adjustable reference source U7, the model of adjustable reference source U7 is TL431, triode Q73 emitter connects triode Q74 base stage, triode Q74 base stage meets the reference utmost point and the potentiometer R73 of adjustable reference source U7, the negative electrode of another termination adjustable reference source U7 of potentiometer R73 and the negative pole of electrochemical capacitor C71.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103587428A (en) * | 2013-11-15 | 2014-02-19 | 安徽江淮汽车股份有限公司 | Safety protection control device and method |
| US9592744B2 (en) | 2013-12-06 | 2017-03-14 | SZ DJI Technology Co., Ltd | Battery and unmanned aerial vehicle with the battery |
| CN107919699A (en) * | 2017-11-23 | 2018-04-17 | 深圳市沃特玛电池有限公司 | Electric automobile and its battery pack |
| CN110021976A (en) * | 2019-03-18 | 2019-07-16 | 深圳市稳先微电子有限公司 | A kind of overcharged voltage protection detection circuit and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103587428A (en) * | 2013-11-15 | 2014-02-19 | 安徽江淮汽车股份有限公司 | Safety protection control device and method |
| CN103587428B (en) * | 2013-11-15 | 2016-05-18 | 安徽江淮汽车股份有限公司 | Security protection control device and method |
| US9592744B2 (en) | 2013-12-06 | 2017-03-14 | SZ DJI Technology Co., Ltd | Battery and unmanned aerial vehicle with the battery |
| US10525832B2 (en) | 2013-12-06 | 2020-01-07 | SZ DJI Technology Co., Ltd. | Battery and unmanned aerial vehicle with the battery |
| US10625613B2 (en) | 2013-12-06 | 2020-04-21 | SZ DJI Technology Co., Ltd. | Battery and unmanned aerial vehicle with the battery |
| US10906427B2 (en) | 2013-12-06 | 2021-02-02 | SZ DJI Technology Co., Ltd. | Battery and unmanned aerial vehicle with the battery |
| US11607972B2 (en) | 2013-12-06 | 2023-03-21 | SZ DJI Technology Co., Ltd. | Battery and unmanned aerial vehicle with battery indicator and venting opening |
| CN107919699A (en) * | 2017-11-23 | 2018-04-17 | 深圳市沃特玛电池有限公司 | Electric automobile and its battery pack |
| CN110021976A (en) * | 2019-03-18 | 2019-07-16 | 深圳市稳先微电子有限公司 | A kind of overcharged voltage protection detection circuit and system |
| CN110021976B (en) * | 2019-03-18 | 2023-10-20 | 西安稳先半导体科技有限责任公司 | Overcharge voltage protection detection circuit and system |
| CN117559611A (en) * | 2024-01-10 | 2024-02-13 | 江西朴拙医疗设备有限公司 | Eye electro-stimulation treatment device |
| CN117559611B (en) * | 2024-01-10 | 2024-03-22 | 江西朴拙医疗设备有限公司 | Eye electro-stimulation treatment device |
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