CN102621494B - Zenith tracking device, protective device and electric battery - Google Patents
Zenith tracking device, protective device and electric battery Download PDFInfo
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- CN102621494B CN102621494B CN201210012213.7A CN201210012213A CN102621494B CN 102621494 B CN102621494 B CN 102621494B CN 201210012213 A CN201210012213 A CN 201210012213A CN 102621494 B CN102621494 B CN 102621494B
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- 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
Abstract
The invention provides a kind of Zenith tracking device, protective device and electric battery, wherein be judged to be continuously with the cycle of every 250m second resistance (the resistance Ra1 of charge path comprising secondary cell (1), Ra2, Rb1, Rb2 and Rc1, Rc2) voltage drop produced in is carried out detecting at interior cell voltage and the voltage ratio protection circuit (5) that detects detects the also high number of times of the assigned voltage (4.3V) of the overvoltage condition of secondary cell, more than second number (2 times) being less than the number of times detecting cell voltage in during 1.5 seconds till being detected voltage by protection circuit (5), that detects secondary cell (1) crosses battery status.Thus, when the charging current of secondary cell increases, can prevent detecting the superpotential protection circuit higher than the superpotential being undertaken detecting by software control and first the overvoltage condition of secondary cell be detected.
Description
Technical field
The present invention relates to the superpotential Zenith tracking device of detection secondary cell, possess the protective device of this Zenith tracking device and possess the electric battery of this protective device.
Background technology
In the charging process of secondary cell taking lithium ion battery as representative; the so-called constant current/constant voltage charging modes of main employing; that is: constant-current charge is carried out with rated current; after terminal voltage (hereinafter referred to as cell voltage) reaches and is set the also low assigned voltage of the maximum voltage (for preventing the protection voltage of overcharge) of allowing than secondary cell, charge with constant-voltage charge.When cell voltage exceedes maximum voltage, life-span (degree of deterioration) and the charge and discharge capacitance of battery can be damaged, causing the worry of catching fire in addition, therefore controlling in charging process as making cell voltage not exceed maximum voltage.
When preventing the superpotential of secondary cell, in order to expect reliability, mostly carry out two ore control by hardware based protection circuit and the control circuit being undertaken controlling by software.Such as, Patent Document 1 discloses a kind of battery pack, comprising: protection circuit, it becomes when the state higher than maximum setting voltage is longer than minimum setup time at cell voltage and detects that secondary cell is in maximum overcharge condition; And control circuit, it becomes the state also higher than the setting voltage lower than maximum setting voltage is longer than setting-up time at cell voltage and is judged to be that secondary cell is in overcharge condition.
But, in charging process, because detected as cell voltage after the clean voltage being in voltage drop and the secondary cell produced in the parts such as the wiring in charge path, on-off element is added, the clean charging voltage be applied in after therefore deducting described voltage drop in constant-voltage charge is on the secondary battery changed to little/large according to the large/little of charging current.
On the other hand, Patent Document 2 discloses following technology: detect and counteract cell voltage after the voltage drop produced in charge path because of charging current to carry out constant-voltage charge by bucking voltage, thus the clean charging voltage that applies on the secondary battery can be made constant.By this technology is applicable to above-mentioned control circuit, carry out superpotential judgement based on the cell voltage having deducted the voltage drop produced in charge path, thus correctly can judge whether secondary cell is in overcharge condition.
[prior art document]
[patent documentation]
[patent documentation 1] Japanese Unexamined Patent Publication 2004-127532 publication
[patent documentation 2] Japanese Unexamined Patent Publication 7-95733 publication
But; above-mentioned protection circuit is normally come to be realize by general IC; the technology of patent documentation 2 is adopted to be to deduct the interior voltage drop produced of charge path; therefore when charging voltage increases to more than the degree of imagination; there is following problem: before being judged to be overvoltage condition by control circuit, can first detect maximum overcharge condition by protection circuit.
Summary of the invention
The present invention puts in view of the above problems and carries out; its object is to: a kind of Zenith tracking device, protective device and electric battery are provided; wherein when the charging current of secondary cell increases, can prevent from detecting the overvoltage condition that Billy's software control and the also high superpotential protection circuit (hereinafter also referred to testing circuit) of the superpotential that is detected first detect secondary cell.
The Zenith tracking device that the present invention relates to, comprise: testing circuit, it, when the cell voltage of secondary cell of the voltage drop comprising charge path continue for more than the stipulated time higher than the state of assigned voltage, detects that described secondary cell is in the overvoltage condition of regulation, and control circuit, it detects described cell voltage and charging current to calculate the bucking voltage of offsetting described voltage drop according to time series, voltage after being added with the cell voltage detected by the bucking voltage calculated is above higher than the first voltage regulation number continuously, detect that described secondary cell is in the first overvoltage condition of regulation, wherein said first voltage is lower than described assigned voltage, the feature of this Zenith tracking device is, described control circuit has: detection unit, whether its judgement is higher than described assigned voltage to the voltage after described battery voltage detection according to time series, and count section, to this detection unit, it is judged to be that high number of times counts, when the number of times of this count section continuous counter be second number fewer than the number of times detecting described cell voltage within the described stipulated time above, detect that described secondary cell is in the second overvoltage condition.
In the present invention, the voltage ratio testing circuit that detects being judged to continuously to detect the cell voltage comprising the voltage drop produced in the charge path of secondary cell according to time series detects the also high number of times of the assigned voltage of the overvoltage condition of regulation, for than detect in the stipulated time till the overvoltage condition being detected regulation by testing circuit second time few number of the number of times of cell voltage above, control circuit detects the second overvoltage condition of secondary cell.
Thus, because voltage is higher than assigned voltage when being added the charging of the secondary cell of voltage drop, even if so when the probability of the overvoltage condition being detected regulation by testing circuit after the stipulated time is high, detected the second overvoltage condition by control circuit detect the overvoltage condition of regulation at testing circuit before.
The Zenith tracking device that the present invention relates to, comprise: testing circuit, it, when the cell voltage of secondary cell of the voltage drop comprising charge path continue for more than the stipulated time higher than the state of assigned voltage, detects that described secondary cell is in the overvoltage condition of regulation, and control circuit, it detects described cell voltage and charging current to calculate the bucking voltage of offsetting described voltage drop according to time series, voltage after being added with the cell voltage detected by the bucking voltage calculated is above higher than the first voltage regulation number continuously, detect that described secondary cell is in the first overvoltage condition of regulation, wherein said first voltage is lower than described assigned voltage, the feature of this Zenith tracking device is, described control circuit has: detection unit, it judges that whether the size of described bucking voltage is also larger than setting, wherein this setting is less than the difference of described assigned voltage and the first voltage, and count section, to this detection unit, it is judged to be that large number of times counts, when the number of times that this count section counts continuously be second number also fewer than the number of times detecting described cell voltage within the described stipulated time above, detect that described secondary cell is in the second overvoltage condition.
In the present invention, be judged to be the number of times that the size of the bucking voltage of offsetting the voltage drop produced in the charge path of secondary cell is higher than the setting of the assigned voltage of overvoltage condition and the difference of the first voltage that are less than testing circuit and control circuit each Autonomous test secondary cell continuously, for second number also fewer than the number of times detecting cell voltage in the stipulated time till the overvoltage condition being detected regulation by testing circuit above when, control circuit detects the overvoltage condition of secondary cell.
Thus, because the size of the voltage drop of charge path is larger than setting, even if so be in be difficult to before testing circuit, be detected the situation of voltage status by control circuit time, control circuit also can be made to detect the second overvoltage condition before testing circuit detects the overvoltage condition of regulation.
The feature of the Zenith tracking device that the present invention relates to is, described first number is than detecting described cell voltage often within the described stipulated time.
In the present invention, first number counted till control circuit detects the first overvoltage condition is more than the number of times detecting cell voltage in the stipulated time required till the overvoltage condition of testing circuit detection regulation.
Thus, the overvoltage condition of the higher regulation of the deteriorated and damaged possibility of secondary cell of sening as an envoy to earlier can be detected by testing circuit.
The Zenith tracking device that the present invention relates to, comprise: testing circuit, it, when the cell voltage of secondary cell of the voltage drop comprising charge path continue for more than the stipulated time higher than the state of assigned voltage, detects that described secondary cell is in the overvoltage condition of regulation, and control circuit, it detects described cell voltage and charging current to calculate the bucking voltage of offsetting described voltage drop, voltage after the bucking voltage calculated is added with the cell voltage detected continuously higher than the first voltage very first time more than, detect that described secondary cell is in the first overvoltage condition of regulation, wherein said first voltage is lower than described assigned voltage, the feature of this Zenith tracking device is, described control circuit has: detection unit, whether the voltage after its judgement detects described cell voltage is higher than described assigned voltage, and timing unit, it carries out timing when this detection unit is judged to be high, when the time that this timing unit carries out timing is continuously more than second time shorter than the described stipulated time, detects that described secondary cell is in the second overvoltage condition.
In the present invention, the voltage ratio testing circuit that detects being judged to continuously to detect the cell voltage comprising the voltage drop produced in the charge path of secondary cell detects the assigned voltage of the overvoltage condition of the regulation also high time, for than more than short the second time stipulated time till the overvoltage condition being detected regulation by testing circuit, control circuit detects the second overvoltage condition of secondary cell.
Thus, because voltage is higher than assigned voltage when being added the charging of the secondary cell of voltage drop, even if so when the probability of the overvoltage condition being detected regulation by testing circuit after the stipulated time is high, detect the overvoltage condition of regulation at testing circuit before, the second overvoltage condition can be detected by control circuit.
The Zenith tracking device that the present invention relates to, comprise: testing circuit, it, when the cell voltage of secondary cell of the voltage drop comprising charge path continue for more than the stipulated time higher than the state of assigned voltage, detects that described secondary cell is in the overvoltage condition of regulation, and control circuit, it detects described cell voltage and charging current to calculate the bucking voltage of offsetting described voltage drop, voltage after the bucking voltage calculated is added with detected cell voltage continuously higher than the first voltage very first time more than, detect that described secondary cell is in the first overvoltage condition of regulation, wherein said first voltage is lower than described assigned voltage, the feature of this Zenith tracking device is, described control circuit has: detection unit, it judges that whether the size of described bucking voltage is also larger than setting, wherein this setting is less than the difference of described assigned voltage and the first voltage, and timing unit, it carries out timing when this detection unit is judged to be high, when the time that this timing unit carries out timing is continuously more than second time shorter than the described stipulated time, detects that described secondary cell is in the second overvoltage condition.
In the present invention, be judged to be the time that the size of the bucking voltage of offsetting the voltage drop produced in the charge path of secondary cell is higher than the setting of the assigned voltage of overvoltage condition and the difference of the first voltage that are less than testing circuit and control circuit each Autonomous test secondary cell continuously, for more than second time also shorter than the stipulated time till the overvoltage condition being detected regulation by testing circuit when, control circuit detects the overvoltage condition of secondary cell.
Thus, because the size of the voltage drop of charge path is larger than setting, even if so be in be difficult to before testing circuit, detect the situation of overvoltage condition by control circuit time, control circuit also can be made to detect the second overvoltage condition before testing circuit detects the overvoltage condition of regulation.
The Zenith tracking device that the present invention relates to, is characterized in that, the described very first time is longer than the described stipulated time.
In the present invention, the very first time of timing till control circuit detects the first overvoltage condition is longer than the stipulated time required till the overvoltage condition detecting regulation at testing circuit.
Thus, can earlier detect by testing circuit the overvoltage condition making secondary cell deterioration and the higher regulation of damaged possibility.
The protective device that the present invention relates to, is characterized in that comprising: above-mentioned Zenith tracking device; And cutting portion, any one of its testing circuit possessed at this Zenith tracking device and control circuit detects that described secondary cell cuts off the charge path of described secondary cell when being in overvoltage condition.
In the present invention, when any one of the testing circuit of Zenith tracking device and control circuit detects the overvoltage condition of secondary cell, cutting portion cuts off the charge path to secondary cell.
Thus, the secondary cell be connected with protective device can be prevented to be subject to the injury such as deterioration, breakage because sinking into overvoltage condition in charging process.
The protective device that the present invention relates to; it is characterized in that; the mode that described cutting portion has to connect is installed on cut-out element and the on-off element of the non-reset type in described charge path; the cut-out element of described non-reset type detects described secondary cell irreversibly to cut off described charge path when being in overvoltage condition at described testing circuit, at described control circuit, described on-off element detects that described secondary cell switches to cut-off from conducting when being in overvoltage condition.
In the present invention, when the testing circuit of Zenith tracking device detects the overvoltage condition of secondary cell, on-off element, irreversibly to cut off charge path, is switched to cut-off from conducting when control circuit detects the overvoltage condition of secondary cell by the cut-out element of non-reset type.
Thus, when under the situation of the overvoltage condition that should do not specified by testing circuit detection, charging current increases, can cutoff switch element before the cut-out element severs charge path by non-reset type.
The electric battery that the present invention relates to, is characterized in that comprising: above-mentioned protective device; With the secondary cell that can not be subject to the damage of overvoltage condition by the protection of this protective device.
In the present invention, protective device protection secondary cell can not be subject to the infringement of overvoltage condition.
Thus, when the charging current of secondary cell increases, can prevent detecting the superpotential testing circuit higher than the superpotential judged by software control and first electric battery is applicable to the protective device that the overvoltage condition of secondary cell detects.
Invention effect
According to the present invention, be judged to detect the cell voltage comprising voltage drop and the voltage detected higher than assigned voltage number of times or be judged to be the size of bucking voltage than the number of times being less than assigned voltage and the setting of the difference of the first voltage is larger, in during more less than the number of times detecting cell voltage at the appointed time (or, be judged to continuously to detect the cell voltage comprising voltage drop and the voltage detected higher than time of assigned voltage, or be judged to be the time that the size of bucking voltage is larger than the setting of the difference being less than assigned voltage and the first voltage continuously, in during more less than the stipulated time), detect the overvoltage condition of secondary cell.
Thus, because voltage ratio assigned voltage is high when being added the charging of the secondary cell of voltage drop, even if so when detected after the stipulated time by testing circuit superpotential probability high, or because the size of charge path voltage drop is larger than setting, so when being difficult to detection the first overvoltage condition by control circuit before being in testing circuit, before also can detecting the overvoltage condition of regulation at testing circuit by control circuit, the second overvoltage condition is detected.
Therefore, when the charging current of secondary cell increases, can prevent detecting the superpotential testing circuit higher than the superpotential being undertaken detecting by software control and first the overvoltage condition of secondary cell be detected.
Accompanying drawing explanation
Fig. 1 is the block diagram of the configuration example representing the electric battery that embodiments of the present invention 1 relate to.
Fig. 2 is the key diagram that the CPU that represents that embodiments of the present invention 1 relate to and protection circuit are detected the condition of voltage status.
Fig. 3 represents the process flow diagram being detected the processing sequence of the CPU of voltage status when offsetting cell voltage and being higher than 4.2V (the first voltage).
Fig. 4 represents that cell voltage is detected the process flow diagram of the processing sequence of the CPU of voltage status time higher than 4.3V (assigned voltage).
Fig. 5 represents that detecting mark ~ the three based on first detects the process flow diagram that mark makes the processing sequence of the CPU of cutting portion action.
Fig. 6 is the key diagram that the CPU that represents that embodiments of the present invention 2 relate to and protection circuit are detected the condition of voltage status.
Fig. 7 represents that the size of bucking voltage is higher than the process flow diagram of processing sequence of CPU being detected voltage status when setting.
Fig. 8 is the block diagram of the configuration example representing the electric battery that variation relates to.
Symbol description:
10 electric battery
1 secondary cell
1a, 1b, 1c battery unit
3 cutting portions
30 non-reset cut off element (the cut-out element of non-reset type)
35,36MOSFET (on-off element)
4 current sense resistors
5 protection circuits (testing circuit)
6AFE
7 control parts
70CPU
Embodiment
Referring to representing that the accompanying drawing of embodiments of the present invention describes in detail the present invention.
Embodiment 1
Fig. 1 is the block diagram of the configuration example representing the electric battery that embodiments of the present invention 1 relate to.In figure, 10 is electric battery, and electric battery 10 comprises: the temperature sensor 2 of the secondary cell 1 battery unit 1a, 1b, 1c of being made up of lithium ion battery are formed by connecting according to this sequential series and the temperature that detects this secondary cell 1.The positive terminal of battery unit 1a and the negative terminal of battery unit 1c are equivalent to positive terminal and the negative terminal of secondary cell 1 respectively.
Battery unit 1a, 1b, 1c each on be connected in series with resistance Ra1, Ra2, Rb1, Rb2 and Rc1, the Rc2 of the resistance that the wiring that is equivalent to discharge and recharge path produces equivalently.
In addition, secondary cell 1 also can be other the battery such as Ni-MH battery, nickel-cadmium battery.Further, the number forming the battery unit of secondary cell 1 is not limited to 3, it also can be 1, more than 2 or 4.
The positive terminal of secondary cell 1 via cut off this secondary cell 1 charging and discharging currents cutting portion 3 and be connected with just (+) terminal 911.The negative terminal of second electrode 1 is connected with negative (-) terminal 92 via the current sense resistor 4 of the charging and discharging currents for detecting this secondary cell 1.Electric battery 10 is arranged on the electrical equipments (not shown) such as personal computer (PC), portable terminal in the mode that can freely load and unload via just (+) terminal 91 and negative (-) terminal 92.Further, be equivalent to discharge and recharge path (hereinafter also referred to charge path) from just (+) terminal 91 via cutting portion 3, secondary cell 1 and current sense resistor 4 to the path of negative (-) terminal 92.
Cutting portion 3 has the series circuit MOSFET (on-off element) 35 and 36 of the N channel-type that discharge current and the charging current of secondary cell 1 turn on/off respectively and the non-reset that is in series provided with fuse 31,31 between two terminals being cut off to element 30, this series circuit be connected secondary cell 1 positive terminal and just between (+) terminal 91.Also MOSFET35,36 and adopt other on-off elements such as transistor can be replaced.When common discharge and recharge, provide the connection signal of H (height) level from AFE6 described later to MOSFET35 and 36 respective grids.The parallel circuit of heating resistor 32,32 is installed between the another terminal cutting off element 30 at the tie point of fuse 31,31 and non-reset.
Cutting portion 3 also has: drain electrode is connected to the N channel-type MOSFET33 on the another terminal of non-reset cut-out element 30; That be connected to the grid of this MOSFET33 with lead-out terminal or (OR) circuit 34.The source electrode of MOSFET33 is connected to the negative terminal of secondary cell 1.When or the lead-out terminal of circuit 34 is H (height) level, conducting between the drain electrode of MOSFET33 and source electrode, apply the voltage of secondary cell 1 and/or the voltage from outside via fuse 31,31 to heating resistor 32,32, fuse to make fuse 31,31.Thus, discharge and recharge path is irreversibly cut off.Cut off in non-reset the parts cutting off discharge and recharge path in element 30 and be not defined in fuse 31,31.
Be connected at battery unit 1a, 1b, 1c two ends separately: detect each battery unit overvoltage condition and to or circuit 34 input terminal of the protection circuit (testing circuit) 5 of detection signal is provided; And switch the voltage of battery unit 1a, 1b, 1c and the simulation front end circuit (AnalogueFrontEnd provided to the control part 7 be made up of microcomputer.Hereinafter referred to as AFE) on the input terminal of 6.Other input terminals of AFE6 are connected to the two ends of current sense resistor 4.At this, in battery unit 1a, 1b and 1c of being provided to protection circuit 5 and AFE6 voltage separately, comprise the voltage drop produced in resistance Ra1, Ra2, Rb1, Rb2 and Rc1, Rc2.The resistance value of these elements is known, for each in resistance Ra1, Ra2, Rb1, Rb2 and Rc1, Rc2, stores the additive operation value of resistance value in ROM71.
Protection circuit 5 possesses the comparer and timer (all not shown) that compare the respective voltage of battery unit 1a, 1b, 1c and reference voltage respectively.In the present embodiment, reference voltage is 4.3V (assigned voltage), but is not defined in this.Each comparer exports the signal that the timing of timer is started when the voltage ratio 4.3V of battery unit 1a, 1b, 1c of comprising voltage drop is high.And when the time of each timer institute timing is such as more than 1.5 seconds, the overvoltage condition of secondary cell 1 is detected, to or an input terminal of circuit 34 detection signal of overvoltage condition is provided.Thus, the fuse 31,31 of cutting portion 3 is fused, and the discharge and recharge path of secondary cell 1 is cut off.
AFE6 has not shown comparer, when detecting the excess current of secondary cell 1 according to the both end voltage of current sense resistor 4 and the comparative result of reference voltage, the pick-off signal of L (low) level is provided, to cut off charging and discharging currents to MOSFET35,36.Even if AFE6 also provides pick-off signal to MOSFET35,36 when providing the detection signal of overvoltage condition from I/O port 73.
Control part 7 has CPU70, CPU70 and carry out bus connection mutually with lower component, these parts respectively: the ROM71 of the information such as storage program, store the information temporarily produced RAM72, the detection signal of overvoltage condition outputted to or Department of Communication Force 76 that the I/O port 73 of another input terminal of circuit 34 and AFE6, the A/D transducer 74 analog voltage being transformed to digital voltage, the timer 75 and being used for that carried out to timing the time communicate with the electrical equipment of outside.
The voltage provide arbitrary voltage of each battery unit 1a, 1b, 1c of providing from AFE6 to A/D transducer 74, providing from temperature sensor 2, the both end voltage of current sense resistor 4, these analog voltages are transformed to digital voltage by A/D transducer 74.
Department of Communication Force 76 is connected to serial data (SDA) terminal 93 and serial clock (SCL) terminal 94, serial data (SDA) terminal 93 for outside electrical equipment between transceiving data, serial clock (SCL) terminal 94 is for receive clock.
The formation after secondary cell 1 and temperature sensor 2 is removed in the formation of above-mentioned electric battery; be equivalent to the overvoltage protection that the present invention relates to, the formation removed from this overvoltage protection after cutting portion 3 is equivalent to the Zenith tracking device that the present invention relates to.Further, control part 7 and AFE6 are equivalent to control circuit.
And then CPU70, according to the control program be pre-stored within ROM71, performs the process such as computing and input and output.Such as, CPU70 is taken into the voltage of current sense resistor 4 according to time series via A/D transducer 74, add up, with the residual capacity of accumulative secondary cell 1, and generate the data of residual capacity to the charging and discharging currents conversed according to be taken into voltage.The data of the residual capacity generated are sent to external electrical equipment via Department of Communication Force 76.The voltage of temperature sensor 2 is also such as taken into according to time series with the cycle of 250m second via A/D transducer 74 by CPU70, and detects battery temperature based on be taken into voltage.
In addition, CPU70 to detect the voltage of battery unit 1a, 1b, 1c of being supplied to A/D transducer 74 from AFE6 with the cycle of 250m second according to time series, detect the overvoltage condition of secondary cell 1 based on the ceiling voltage in detected voltage.The sense cycle of voltage is not restricted to 250m second.As mentioned above, the voltage drop produced in discharge and recharge path is comprised in detected voltage.
The resistance value of the wiring in the discharge and recharge path that CPU70 stores based on the charging current detected according to time series by current sense resistor 4 and ROM71, calculate the bucking voltage of offsetting above-mentioned voltage drop, by being added with battery unit 1a, 1b, 1c voltage separately by calculated bucking voltage, thus battery unit 1a, 1b, 1c clean voltage separately (hereinafter also referred to counteracting cell voltage) can be inferred.In the present embodiment, CPU70 based on comprise voltage drop battery unit 1a, 1b, 1c voltage separately (hereinafter referred to as cell voltage) and battery unit 1a, 1b, 1c clean voltage separately of inferring detect the overvoltage condition of secondary cell 1, to arrange the different detection mark according to detected condition.
Then, CPU70 according to set detection mark, from I/O port 73 to or circuit 34 or AFE6 the detection signal of overvoltage condition is provided.Thus, when detection signal is supplied to or circuit 34, the fuse 31,31 of cutting portion 3 is fused, and the discharge and recharge path of secondary cell 1 is cut off.Further, when detection signal is supplied to AFE6, provide pick-off signal to MOSFET35,36, the discharge and recharge path of secondary cell 1 is cut off.In this situation, the MOSFET36 of charging also only can be made to end and to cut off charging current, prevent superpotential and overcharge.
Fig. 2 is the key diagram that the CPU70 that represents that embodiment of the present invention 1 relates to and protection circuit 5 are detected the condition of voltage status.In figure, transverse axis represents superpotential determination time (second) or judges number of times, and the longitudinal axis represents cell voltage (V) or offsets cell voltage (V).The superpotential of being undertaken by CPU70 judges to carry out second according to every 250m, and the determination time of 0.5 shown in transverse axis second, 1.5 seconds and 5 seconds corresponds respectively to the judgement number of times of 2 times, 6 times and 20 times, is equivalent to first number and second number for 20 times and 2 times respectively.Further, 4.3V and 4.2V shown in the longitudinal axis is equivalent to assigned voltage and the first voltage respectively.Wherein, the value of first number, second number, assigned voltage and the first voltage is not defined in above-mentioned value.
In fig. 2, the region being endowed the title of mark and the title of protection circuit 5 is the region that CPU70 and protection circuit 5 detect the overvoltage condition of secondary cell 1 respectively.When CPU70 detects overvoltage condition, the mark being given to the title in this region is set.The region being detected voltage status based on cell voltage (or offsetting cell voltage) to be endowed the region of title without the mode of parantheses (or band parantheses).Wherein, be the example being detected the region of overvoltage condition when cell voltage CPU70 and protection circuit 5 judged is scaled and offsets cell voltage with the region of being with the mode of parantheses to be designated as " (second detect mark) " and " (protection circuit) " respectively, represent these regions with the oblique line of upper right or bottom right.
As mentioned above, protection circuit 5 detects the overvoltage condition of secondary cell 1 when cell voltage continue for more than 1.5 seconds higher than the state of 4.3V.Such as, if the additive value of the resistance value of the resistance be connected in series respectively with battery unit 1a, 1b, 1c equivalently (such as resistance Ra1 and Ra2) is 0.035 ohm and flows through the charging current of 2A, then the voltage produced in these resistance reduces to 0.07V.Therefore, protection circuit 5 is detected voltage status when offsetting the state of cell voltage higher than 4.23V (=4.3V-0.07V) and continue for more than 1.5 seconds equivalently.
When charging current is larger than 2A, certainly more decline to the side that voltage is low than 4.23V with the lower limit in the region shown in the thick oblique line of bottom right in fig. 2.Like this, because the charging current of secondary cell 1 increases from 0, then expand downwards with the region shown in the thick oblique line of bottom right, be therefore scaled and offset cell voltage and the voltage lower than 4.2V is easy within 5 seconds, enter the region represented with oblique line.That is, before the first detection mark is set by CPU70, detect that the possibility of the overvoltage condition of secondary cell 1 improves by protection circuit 5.
In present embodiment 1, detect the overvoltage condition of secondary cell 1 at protection circuit 5 before, CPU70 just can be detected voltage status.
Below, utilize process flow diagram to be detected voltage status to CPU70 and arrange the first ~ three detect mark situation be described.CPU70 is when being judged to be that offsetting cell voltage continue for more than 20 times higher than 4.2V, first detection mark is set, detect the overvoltage condition of secondary cell, and the detection signal of overvoltage condition is provided to AFE6 via I/O port 73, make MOSFET35,36 cut-offs thus.
Fig. 3 represents at counteracting cell voltage higher than the process flow diagram being detected the processing sequence of the CPU70 of voltage status 4.2V (the first voltage).The process of Fig. 3 starts with the cycle of 250m second, but be not limited to this.Accumulative and equalization is carried out in the not shown process that charging current in figure and cell voltage are all such as performed with the cycle of 10m second by CPU70 to be derived.
When starting the process shown in Fig. 3, the resistance (resistance value of resistance Ra1, Ra2, Rb1, Rb2 or Rc1, Rc2) that CPU70 calculates the charge path that the electric current of the sign-inverted of charging current and ROM71 are stored is long-pending, to ask for the bucking voltage (S10) of offsetting the voltage drop produced in charge path.Therefore, bucking voltage is calculated as negative value.Then, cell voltage is added with bucking voltage by CPU70, offsets cell voltage (S11), judge the counteracting cell voltage whether high than 4.2V, i.e. the first voltage (S12) of trying to achieve to ask for.
When offsetting cell voltage and being high unlike 4.2V (the first voltage) (S12: no), by be used as counter first, CPU70 judges that number of times resets (S13), further removing first detects mark (S14), terminates the process of Fig. 3.Like this, the counter and mark that adopt in the process of Fig. 3 is removed in during counteracting cell voltage is lower than 4.2V.At counteracting cell voltage higher than (S12: yes) when 4.2V, CPU70 determines whether that detecting mark by first is set to 1 (S15).
Detect (S15: yes) mark is set to 1 when first, CPU70 directly terminates the process of Fig. 3.(S015: no) mark is not set to 1 is detected when first, CPU70, after judging that number of times only increases by 1 (S16) by first, judges that first judges that whether number of times is as more than more than 20 times, namely first time number (S17).
When first judges number of times less than 20 times (S17: no), process is moved to step S14 to carry out the removing of the first detection mark by CPU70.Judge that number of times is as (S17: yes) when more than 20 times when first, by first, CPU70 judges that number of times resets (S18), and then in order to represent that overvoltage condition that secondary cell 1 detected detects mark by first and is set to 1 (S19), then terminate the process of Fig. 3.
Return Fig. 2, CPU70 arranges the 3rd and detects mark when being judged to offset cell voltage for continuous more than 20 times higher than the overvoltage condition detecting secondary cell 1 when 4.25V, via I/O port 73 to or circuit 34 detection signal of overvoltage condition is provided, the fuse 31,31 that non-reset can be made thus to cut off element 30 fuses.Represent and to compare with the process flow diagram shown in Fig. 3 when offsetting the process flow diagram of processing sequence of cell voltage higher than the CPU70 being detected voltage status when 4.25V, difference is: the voltage judged in step S21 is different; And the title of counter adopted in set mark and process is different, other are same process, therefore omit its diagram and explanation.
But, because compared with arranging the situation of the first detection mark, arrange the 3rd when offsetting cell voltage and becoming higher and detect mark, so when the overvoltage condition that the first detection mark is set up being detected, as long as MOSFET35,36 is reliably ended, so the 3rd detection mark would not be set up.That is, the 3rd mark is detected in order to detected when MOSFET35,36 cut-off can not be made.
Then, detect mark to second to be described.CPU70 is when being judged to be cell voltage higher than 4.3V continuous more than 2 times, second detection mark is set, to detect the overvoltage condition of secondary cell 1, be supplied to or circuit 34 by the detection signal of overvoltage condition via I/O port 73, the fuse 31,31 making non-reset cut off element 30 thus fuses.At this; the voltage that CPU70 is set to superpotential determinating reference is identical 4.3V with the reference voltage that the comparer of protection circuit 5 compares; with the judgement number of times than the superpotential determination time of protection circuit 5, i.e. 1.5 seconds short 0.5 second correspondence, CPU70 is detected voltage status.That is, protection circuit 5 plays the effect of fail safe (failsafe) used MOSFET35,36 is not normally ended when being provided with the second detection mark.
Fig. 4 represents at cell voltage higher than the process flow diagram being detected the processing sequence of the CPU70 of voltage status 4.3V (assigned voltage).Although start the process of Fig. 4 with the cycle of 250m second, be not limited to this.
When the process starting Fig. 4, CPU70 judges cell voltage whether high than 4.3V, i.e. assigned voltage (S21), when not higher than (S21: no) when 4.3V, judge that number of times resets (S22) using use as counter second, remove second further and detect mark (S23) and terminate the process of Fig. 4.
At cell voltage higher than (S21: yes) when 4.3V, CPU70 judges whether the second detection mark is set to 1 (S24).Detect (S24: yes) mark is set to 1 when second, CPU70 directly terminates the process of Fig. 3.Detect (S24: no) mark is not set to 1 when second, CPU70 judges that by second number of times judges that second judges that whether number of times is as more than more than 2 times, namely second time number (S26) after only increasing by 1 (S25).
When discontented 2 times (S26: no), CPU70 detects the removing of mark in order to ensure second and process is moved to step S23.Judge that number of times is as (S26: yes) when more than 2 times when second, by second, CPU70 judges that number of times resets (S27), and then in order to represent that the overvoltage condition that detects secondary cell 1 detects mark by second and is set to 1 (S28), terminate the process of Fig. 4.
Below, detect the process that mark cuts off discharge and recharge path be described according to whether being provided with the first detection mark ~ three.
Fig. 5 is the process flow diagram of the processing sequence representing CPU70 cutting portion 3 being worked based on the first detection mark ~ the three detection mark.Although start the process of Fig. 5 with the cycle of 250m second, be not limited to this.
When the process starting Fig. 5, CPU70 determines whether that detecting mark by first is set to 1 (S31), when being set up (S31: yes), provides pick-off signal via I/O port 73 and AFE6 to MOSFET35,36.Thus, the MOSFET35 of cutting portion 3,36, i.e. on-off element cut-off (S32) are made.Detect (S31: no) mark is not set to 1 when first, CPU70 determines whether that detecting mark by second is set to 1 (S33).
Detect (S33: yes) mark is set to 1 when second, process is moved to step S32 to make on-off element end by CPU70.Detect (S33: no) mark is not set to 1 when second, CPU70 provides Continuity signal via I/O port 73 and AFE6 to MOSFET35,36, thus, makes the switching elements conductive (S34) of cutting portion 3.When finishing the process of step S32 or S34, CPU70 determines whether that detecting mark by the 3rd is set to 1 (S35).
Detect (S35: no) mark is not set to 1 when the 3rd, CPU70 directly terminates the process of Fig. 5.Detect (S35: yes) mark is set to 1 when the 3rd, CPU70 via I/O port 73 to or circuit 34 signal of H (height) level is provided after terminate the process of Fig. 5.Thus, MOSFET33 conducting, the fuse 31,31 that non-reset cuts off element 30 fuses (S36).
As mentioned above; according to the present embodiment 1; be judged to be that every 250m detects the cell voltage comprising the voltage drop produced in the charge path of secondary cell second and the voltage ratio protection circuit detected is detected the also high number of times of the assigned voltage (4.3V) of voltage status continuously; when detecting in during than 1.5 to detecting overvoltage condition by protection circuit second more than also few second number (2 times) of the number of times of cell voltage, CPU detects the overvoltage condition of secondary cell.
Thus; because voltage when being added the charging of the secondary cell after voltage drop is higher than assigned voltage; even if so when detecting that the probability of overvoltage condition was high by protection circuit after 1.5 seconds, before protection circuit is detected voltage status, first use CPU to be detected voltage status.
Therefore, when the charging current of secondary cell increases, can prevent from detecting the overvoltage condition that the superpotential protection circuit higher than the superpotential detected by software control first detects secondary cell.
Further, the number of times (6 times) of detection cell voltage is many in during first number (20 times) counted before CPU is detected voltage status was than 1.5 seconds required being detected voltage status to protection circuit.
Thereby, it is possible to earlier detect the higher overvoltage condition of the deteriorated and damaged possibility of secondary cell of sening as an envoy to by protection circuit.
Further, when any one of the protection circuit of Zenith tracking device and CPU detects the overvoltage condition of secondary cell, cutting portion cuts off the charge path to secondary cell.
Thereby, it is possible to prevent the secondary cell be connected with protective device to be subject to the destruction such as deterioration, breakage because of sinking into overvoltage condition in charging.
And then; when the protection circuit of Zenith tracking device detects overvoltage condition; non-reset cuts off the fuse of element irreversibly to cut off charge path; when CPU detects overvoltage condition, on-off element (MOSFET) is switched to cut-off from conducting.
Thus, when charging current increases under the situation that should not be detected voltage status by protection circuit, before the cut-out element severs charge path by non-reset type, on-off element can be made to end.
In addition, protective device protection secondary cell can not be subject to the infringement of overvoltage condition.
Thus, when the charging current of secondary cell increases, first can be used for electric battery to the protective device that the overvoltage condition of secondary cell detects by preventing detecting the superpotential protection circuit higher than the superpotential determined by software.
Embodiment 2
Embodiment 1, when detecting the overvoltage condition of secondary cell 1 based on cell voltage, was detected voltage status by CPU70 and arranges the second detection mark before protection circuit 5 is detected voltage status.On the other hand; embodiment 2 compares at the assigned voltage compared relative to protection circuit 5 and cell voltage and CPU710 and counteracting cell voltage for the difference of the first voltage of judgement; more cannot ignore in the size of bucking voltage; when then charging current just becomes larger, CPU70 first arranges the second detection mark than protection circuit 5.
Fig. 6 is the key diagram that the CPU70 that represents that embodiment of the present invention 2 relates to and protection circuit 5 are detected the condition of voltage status.This expression of transverse axis superpotential determination time (second) or judgement number of times in figure, the longitudinal axis represents cell voltage (V) or offsets cell voltage (V).When determination time longer than 5 seconds and offset cell voltage higher than 4.23V, be endowed the region of the title of mark and the title of protection circuit 5, be designated as without the meaning pointed by the region of the title of parantheses (band parantheses) and the region that represents with the thick oblique line of bottom right identical with the situation of Fig. 2.
Further, when offsetting cell voltage higher than 4.23V, different from the example shown in Fig. 2, even if detect the situation of the overvoltage condition of secondary cell 1 at protection circuit 5 under, the second detection mark also can not be set.Therefore; be scaled and offset the voltage lower than 4.2V after cell voltage when rising to more than 4.23V and enter into the region represented with the thick oblique line of bottom right within 5 seconds, before the first detection mark is set by CPU70, is detected the overvoltage condition of secondary cell 1 by protection circuit 5.
Therefore; in present embodiment 2; charging current than 2A the large and lower voltage limit being detected the overvoltage condition of secondary cell 1 by protection circuit 5 be scaled offset cell voltage after will lower than (when the region represented with the oblique line of upper right in Fig. 6 be expanded in the region that such as protection circuit 5 is detected voltage status to) when 4.23V; before protection circuit 5 is detected voltage status, CPU70 can arrange the second detection mark.In other words; when the size of bucking voltage offsetting the voltage drop that wiring produces is greater than 0.07V (=the 4.3V-4.23V) less than the difference of assigned voltage (4.3V) and the first voltage (4.2V), CPU70 first detects the overvoltage condition of secondary cell 1 than protection circuit 5.
Specifically, be judged to be that number of times that the size of bucking voltage is larger than 0.07V is when with that is corresponding to 1.5 seconds shorter 0.5 second more than 2 times of the superpotential determination time than protection circuit 5, arranges the second detection mark continuously.In figure 6, the region being provided with the second detection mark is represented with the thin oblique line of bottom right.Wherein, CPU70 arranges the region of the second detection mark; after all be the region detecting the overvoltage condition of secondary cell 1 with protection circuit 5 describing afterwards of carrying out contrasting, second to detect mark itself be set up when the charging current that the size of bucking voltage is larger than 0.07V flows through more than 0.5 second.Thus, MOSFET35,36 cut-offs are temporarily made as a kind of overcurrent protection.
Further, the critical value of above-mentioned 4.23V is not limited to this, can suitably setting in the scope of assigned voltage (4.3V) and the first voltage (4.2V).When being below 4.2V by this critical value setting; when such as charging current becomes more than 0.286A (=0.1V/0.035 ohm) in the scope not arranging the second detection mark, there is the region that protection circuit 5 was detected voltage status all the time before CPU70.
Fig. 7 represents the process flow diagram being detected the processing sequence of the PCU70 of voltage status when the size of bucking voltage is also large than setting.Although start the process of Fig. 3 with the cycle of 250m second, be not limited to this.
When the process starting Fig. 7, CPU70 calculates and makes the resistance of the charge path stored in the electric current after the sign-inverted of charging current and ROM71 long-pending, in the hope of taking the negative bucking voltage (S40) in offsetting the voltage drop produced in charge path.Then, CPU70 judges the absolute value whether large than 0.07V (S41) of size, the i.e. bucking voltage of bucking voltage.
When the absolute value of bucking voltage is large unlike 0.07V (S41: no), process enters step S42, and when larger than 0.07V (S41: yes), process enters step S44.At this, identical with the process of step S22 to the S28 shown in Fig. 4 from the process of step S42 to S48, therefore omit the description.
In addition, give same mark for the place corresponding with embodiment 1, and description is omitted.
As mentioned above according to the present embodiment 2; in the size being judged to offset the bucking voltage of voltage drop produced in the charge path of secondary cell continuously than the assigned voltage (4.3V) of the overvoltage condition of protection circuit and CPU each Autonomous test secondary cell and the also high number of times of the difference (0.1V) of the first voltage (4.2V); when detecting in during than 1.5 seconds till detecting overvoltage condition by protection circuit more than also few second number (2 times) of the number of times of cell voltage, detect the overvoltage condition of secondary cell.
Thus; because the size of the voltage drop of charge path is larger than setting; even if so be in be difficult to before protection circuit, be detected the situation of voltage status by CPU time, CPU also can be made to detect overvoltage condition before protection circuit is detected voltage status.
Have again, in embodiment 1 and 2, although when offsetting situation that cell voltage and cell voltage be all greater than setting higher than the situation of assigned voltage and the size of bucking voltage and continue for more than the judgement number of times of regulation, the detection mark of regulation is set, but also the detection mark of regulation can be set when above-mentioned each situation continue for more than the time corresponding with judging number of times.Specifically, such as, in the step S25 shown in the process flow diagram of Fig. 4, S26, due to make second judge number of times increase after result as more than second number, thus regard as judgement and continue for the stipulated time more than, the second detection mark is set.
Further, in embodiment 1 and 2, among what the software performed by hardware and the CPU70 of control circuit realized formed, the step S21 shown in Fig. 4, Fig. 7, S41 be equivalent to the software of detection unit, and step S25, S45 are equivalent to the software of count section or timing unit.
And then; in embodiment 1 and 2; be illustrated being connected in series resistance, the i.e. situation of resistance Ra1, Ra2, Rb1, Rb2 and Rc1, Rc2 that the wiring that is equivalent to discharge and recharge path produces in battery unit 1a, 1b and 1c equivalently; but when the mode of the impact according to the voltage drop that can not be subject to based on these resistance can connect protection circuit 5 and AFE6 and battery unit 1a, 1b and 1c, do not worry that protection circuit 5 can detect the overvoltage condition of secondary cell 1 before CPU70.
Such as, Fig. 8 is the block diagram of the configuration example representing the electric battery that variation relates to.In fig. 8 because the resistance value of resistance Ra2, Rb1, Rb2 and Rc1 is compared can ignore with the resistance value of resistance Ra1, Rc2, so omit diagram.Further, protection circuit 5 and AFE6 input terminal separately is directly connected with battery unit 1a, 1b and 1c.Other circuit is identical with the situation of Fig. 1.In the electric battery shown in Fig. 8, because do not comprise the voltage drop produced in charge path because of charging current in the voltage of protection circuit 5 and CPU70 each self-monitoring battery unit 1a, 1b and 1c, so above-mentioned counteracting cell voltage is equal with cell voltage.Therefore, the region that protection circuit 5 detects the overvoltage condition of secondary cell 1 in fig. 2 can't relate to the region shown in the oblique line of bottom right in Fig. 2, in the testing process of the overvoltage condition of secondary cell 1, can not be subject to the impact of the size of charging current.
Embodiment disclosed in the present application all just illustrates in all respects, and should not be regarded as limited content.Scope of the present invention is not above-mentioned implication, but is represented by the technical scheme scope of claims, means all changes comprised with in the implication of the scope equalization of technical scheme and scope.
Claims (11)
1. a Zenith tracking device, comprise: testing circuit, it, when the cell voltage of secondary cell of the voltage drop comprising charge path continue for more than the stipulated time higher than the state of assigned voltage, detects that described secondary cell is in the overvoltage condition of regulation; And
Control circuit, it detects described cell voltage and charging current to calculate the bucking voltage of offsetting described voltage drop according to time series, voltage after being added with the cell voltage detected by the bucking voltage calculated is above higher than the first voltage regulation number continuously, detect that described secondary cell is in the first overvoltage condition of regulation, wherein said first voltage is lower than described assigned voltage
The feature of described Zenith tracking device is,
Described control circuit has:
Detection unit, it judges that whether the voltage obtained described battery voltage detection according to time series is higher than described assigned voltage; With
Count section, to this detection unit, it is judged to be that high number of times counts,
When the number of times of this count section continuous counter be second number fewer than the number of times detecting described cell voltage within the described stipulated time above, detect that described secondary cell is in the second overvoltage condition.
2. Zenith tracking device according to claim 1, is characterized in that,
Described first number is than detecting described cell voltage often within the described stipulated time.
3. a Zenith tracking device, comprise: testing circuit, it, when the cell voltage of secondary cell of the voltage drop comprising charge path continue for more than the stipulated time higher than the state of assigned voltage, detects that described secondary cell is in the overvoltage condition of regulation; And
Control circuit, it detects described cell voltage and charging current to calculate the bucking voltage of offsetting described voltage drop according to time series, voltage after being added with the cell voltage detected by the bucking voltage calculated is above higher than the first voltage regulation number continuously, detect that described secondary cell is in the first overvoltage condition of regulation, wherein said first voltage is lower than described assigned voltage
The feature of described Zenith tracking device is,
Described control circuit has:
Detection unit, it judges that whether the size of described bucking voltage is also larger than setting, and wherein this setting is less than the difference of described assigned voltage and the first voltage; With
Count section, to this detection unit, it is judged to be that large number of times counts,
When the number of times that this count section counts continuously be second number also fewer than the number of times detecting described cell voltage within the described stipulated time above, detect that described secondary cell is in the second overvoltage condition.
4. Zenith tracking device according to claim 3, is characterized in that,
Described first number is than detecting described cell voltage often within the described stipulated time.
5. a Zenith tracking device, comprise: testing circuit, it, when the cell voltage of secondary cell of the voltage drop comprising charge path continue for more than the stipulated time higher than the state of assigned voltage, detects that described secondary cell is in the overvoltage condition of regulation; And
Control circuit, it detects described cell voltage and charging current to calculate the bucking voltage of offsetting described voltage drop, voltage after the bucking voltage calculated is added with the cell voltage detected continuously higher than the first voltage very first time more than, detect that described secondary cell is in the first overvoltage condition of regulation, wherein said first voltage is lower than described assigned voltage
The feature of described Zenith tracking device is,
Described control circuit has:
Detection unit, it judges that whether the described cell voltage detected is higher than described assigned voltage; With
Timing unit, it carries out timing when this detection unit is judged to be high,
When the time that this timing unit carries out timing is continuously more than second time shorter than the described stipulated time, detect that described secondary cell is in the second overvoltage condition.
6. Zenith tracking device according to claim 5, is characterized in that,
The described very first time is longer than the described stipulated time.
7. a Zenith tracking device, comprise: testing circuit, it, when the cell voltage of secondary cell of the voltage drop comprising charge path continue for more than the stipulated time higher than the state of assigned voltage, detects that described secondary cell is in the overvoltage condition of regulation; And
Control circuit, it detects described cell voltage and charging current to calculate the bucking voltage of offsetting described voltage drop, voltage after the bucking voltage calculated is added with the cell voltage detected continuously higher than the first voltage very first time more than, detect that described secondary cell is in the first overvoltage condition, wherein said first voltage is lower than described assigned voltage
The feature of described Zenith tracking device is,
Described control circuit has:
Detection unit, it judges that whether the size of described bucking voltage is also larger than setting, and wherein this setting is less than the difference of described assigned voltage and the first voltage; With
Timing unit, it carries out timing when this detection unit is judged to be large,
When the time that this timing unit carries out timing is continuously more than second time shorter than the described stipulated time, detect that described secondary cell is in the second overvoltage condition.
8. Zenith tracking device according to claim 7, is characterized in that,
The described very first time is longer than the described stipulated time.
9. a protective device, is characterized in that, comprising:
Zenith tracking device according to any one of claim 1 to 8; With
Cutting portion, any one of its testing circuit possessed at this Zenith tracking device and control circuit detects that described secondary cell cuts off the charge path of described secondary cell when being in overvoltage condition.
10. protective device according to claim 9, is characterized in that,
The mode that described cutting portion has to connect inserts cut-out element and the on-off element of the non-reset type be installed in described charge path,
The cut-out element of described non-reset type detects described secondary cell irreversibly to cut off described charge path when being in overvoltage condition at described testing circuit,
At described control circuit, described on-off element detects that described secondary cell switches to cut-off from conducting when being in overvoltage condition.
11. 1 kinds of electric battery, is characterized in that, comprising:
Protective device described in claim 9 or 10; With
The secondary cell preventing from being in overvoltage condition protected by this protective device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011013127A JP2012157128A (en) | 2011-01-25 | 2011-01-25 | Overvoltage detection device, protection device and battery pack |
| JP2011-013127 | 2011-06-10 |
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| Publication Number | Publication Date |
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| CN102621494A CN102621494A (en) | 2012-08-01 |
| CN102621494B true CN102621494B (en) | 2015-12-09 |
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| CN103490390B (en) * | 2013-09-26 | 2016-04-13 | 深圳市沛城电子科技有限公司 | There is battery management system and the method for double protection functions |
| JP6414211B2 (en) * | 2014-05-30 | 2018-10-31 | 富士電機株式会社 | Charger |
| CN104393574B (en) * | 2014-10-28 | 2018-11-27 | 芜湖天元汽车电子有限公司 | A kind of lithium battery protection board electric leakage flow control circuit |
| CN104459556B (en) * | 2014-12-03 | 2017-08-01 | 重庆长安汽车股份有限公司 | Battery system method for diagnosing faults and device |
| CN105406527A (en) * | 2015-11-20 | 2016-03-16 | 芜湖锐芯电子科技有限公司 | Overvoltage protection module of lithium ion battery pack |
| JP6691665B2 (en) * | 2016-08-05 | 2020-05-13 | 株式会社Ｇｓユアサ | Power storage device, power storage device control method, vehicle |
| US10148101B2 (en) * | 2016-08-12 | 2018-12-04 | Mediatek Inc. | Battery charging system and battery charging protection control method |
| KR102433146B1 (en) * | 2017-09-28 | 2022-08-17 | 주식회사 엘지에너지솔루션 | Method for preventing swelling of battery cell and battery pack using the same |
| JP7236860B2 (en) * | 2018-03-26 | 2023-03-10 | 日立Astemo株式会社 | voltage detector |
| CN112003236B (en) * | 2020-08-28 | 2022-09-23 | 杭州海兴电力科技股份有限公司 | Overvoltage and overcurrent protection system for electric energy meter |
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