CN204758792U - Rechargeable battery security detection circuitry and charger - Google Patents
Rechargeable battery security detection circuitry and charger Download PDFInfo
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- CN204758792U CN204758792U CN201520276551.0U CN201520276551U CN204758792U CN 204758792 U CN204758792 U CN 204758792U CN 201520276551 U CN201520276551 U CN 201520276551U CN 204758792 U CN204758792 U CN 204758792U
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Abstract
The utility model provides a rechargeable battery security detection circuitry, including charging current sampling unit, integral unit and comparing element, charging current sampling unit, integral unit and comparing element connect in proper order, through sampling charging current signal, obtain to charge a coulomb signal to charge the sampling with coulomb signal and default and carry out the comparison, determine the battery and whether break down, and send the failure diagnosis signal when exceeding the default, prevent and continue to charge to the battery. The utility model provides a charger that has rechargeable battery security detection circuitry. The utility model discloses not only reliable and simple has avoided dangerous emergences such as explosion, the effectual security that has improved in the battery use moreover.
Description
Technical field
The utility model relates to a kind of rechargeable battery security testing circuit and has rechargeable battery security testing circuit charger.
Background technology
Rechargeable battery is after repeatedly Reusability, often damage because inside battery is aging, if continue charging to aging battery, blast, spontaneous combustion, the danger such as on fire may be caused, therefore be necessary in the routine use of battery, detect aging or fail battery in time, and forbid its charging, thus improve the security of battery use.
Application number is the utility model patent of 201410063213.9, provide a kind of appraisal procedure of Li-ion batteries piles health status, define SOH=Ccal/Cexp, wherein Cexp=(SOCchgf-SOCchg0) XCr, wherein Cr is the nominal capacity of battery, SOCchgf is charge value when being full of, and is generally 1 that is 100%; SOCchg0 is the charge value started when charging, such as x%.Namely Ccal is filled with electricity when starting to charge to full charge cut-off.Above-mentioned definition is known, and it needs battery to be charged to full charge cut-off state (cell voltage reaches VreatedXN and I<=0.1C) for battery security assessment.For some bad battery, because its internal diaphragm has existed local micropuncture, there is local interior's short circuit phenomenon, how long then no matter fill, cell voltage is all less than VreatedXN or I>=0.1C, if like this according to documents work, there will be and charge to battery explosion and all do not wait until the SOH value calculating characterizing battery health status, namely documents embodiment is in order to calculate SOH value, and often filled by battery quick-fried, therefore this method has certain danger.
Utility model content
The utility model overcomes above-mentioned shortcoming, provides a kind of simple, safe and reliable rechargeable battery security testing circuit and has rechargeable battery security testing circuit charger.
The technical scheme in the invention for solving the technical problem is: a kind of rechargeable battery security testing circuit, comprises
Charge current sample unit, for sampling to charging current, obtains sampling charging current signal;
Integral unit, for the sampling charging current signal that will obtain to duration of charging integration, obtains sampling charging coulomb signal;
Comparing unit, for described sampling charging coulomb signal and preset value being compared, if exceed described preset value, then sending breakdown judge signal, otherwise not sending signal or send analysis signal;
Described charge current sample unit, integral unit and comparing unit are linked in sequence.
Described charge current sample unit comprises sampling resistor, operational amplifier and PMOS, described sampling resistor is connected on battery to be charged institute in the loop, one end of described sampling resistor connects an input end of described operational amplifier, the other end is connected to another input end of described operational amplifier through another resistance, and be connected to the source electrode of described PMOS simultaneously, the grid of described PMOS connects the output terminal of described operational amplifier, drain as the output terminal of described charge current sample unit, export sampling charging current signal, and connect the input end of described integral unit.
Described integral unit comprise an electric capacity, one with the switch of described Capacitance parallel connection and a phase inverter, the input end of described phase inverter connects and receives startup charging signals, output terminal is connected with the control end of described switch, described electric capacity one end ground connection, the other end is as the input end of described integral unit, be connected with the output terminal of described charge current sample unit, and simultaneously as the output terminal of described integral unit, be connected with the input end of described comparing unit.
Described comparing unit is the comparer be made up of another operational amplifier, an input end of described comparer is as the input end of comparing unit, be connected with the output terminal of described integration current, another input end connects described preset value signal, and output terminal is then as the output terminal of described comparing unit.
Described charge current sample unit comprises sampling resistor and analog to digital converter, described sampling resistor is connected on battery to be charged institute in the loop, described analog to digital converter is used for flowing through the sampling charging current signal of described sampling resistor, is converted to the digital signal characterizing sampling charging current; Described integral unit adopts wave digital lowpass filter, for described characterize the digital signal of sampling charging current realize storage effect, described comparing unit adopts digital comparator.
There is a charger for rechargeable battery security testing circuit, comprise and charging circuit, also comprise the charge current sample unit, integral unit and the comparing unit that are linked in sequence,
Described charge current sample unit, for sampling to charging current, obtains sampling charging current signal;
Described integral unit, for the sampling charging current signal that will obtain to duration of charging integration, obtains sampling charging coulomb signal;
Described comparing unit, for described sampling charging coulomb signal and preset value being compared, if exceed described preset value, then sending breakdown judge signal, otherwise not sending signal or send analysis signal;
Described charge current sample unit comprises sampling resistor, described sampling resistor is connected on input end or the output terminal of described charging current, the output terminal of described comparing unit connects and controls described charging circuit, when described comparing unit sends breakdown judge signal, described charging circuit stops exporting charging current to battery to be charged.
Described preset value is nA/K, and wherein n is coefficient, the nominal capacity of value to be 2.5 ~ 3.5, A be battery, and K is charging current signal and the sampling ratio of sampling charging current signal.
The utility model is by sampling charging current signal, obtain charging coulomb signal, and described sampling charging coulomb signal and preset value are compared, judge whether battery breaks down, and judge when exceeding preset value to break down, the concurrent judgement signal that is out of order, stop and continue charging to battery, the utility model is not only simple, and avoids the generation of the danger such as blast, effectively raises the security in battery use procedure.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the charger in the utility model with rechargeable battery security testing circuit;
Fig. 2 is in a kind of preferred embodiment, the circuit theory diagrams of charge current sample unit;
Fig. 3 is in a kind of preferred embodiment, the circuit theory diagrams of integral unit and comparing unit;
Fig. 4 is the theory diagram of another preferred embodiment.
Embodiment
First, definition charging current signal is charging coulomb signal to the integration in duration of charging, i.e. charging charge amount, unit is coulomb, and charging current signal of sampling is charging coulomb signal to the integration in duration of charging, charging charge amount of namely sampling, and fixed proportion is become with charging charge amount, for reducing power consumption, sample rate current generally occupies very little ratio being sampled in electric current.
Find through lot of experiments: suppose that battery nominal capacity is A, sampling is than being K, i.e. charging current signal/sampling charging current signal is K/1, the charging charge amount of sampling is B, then B>nA/K can as the standard of failure judgement battery, wherein n is coefficient, and value is 2.5 ~ 3.5, and preferred values is 3.To be new battery (should be normal battery) be discharged to from full power state (namely cannot be filled with current status) quantity of electric charge that electroless state (namely cannot output current state) can discharge to general nominal capacity.Therefore, principle of the present utility model adopts battery charge to the integration of time, obtains charging coulomb to judge whether battery damages, judge that the higher limit of battery failures is 3A/K.
Based on above-mentioned theory, in conjunction with embodiment below, the utility model content is described in detail.
The utility model provides a kind of charger with rechargeable battery security testing circuit, as shown in fig. 1, for the described theory diagram with the charger of rechargeable battery security testing circuit, comprise the charging circuit for charging to battery BAT, also comprise the charge current sample unit, integral unit and the comparing unit that are linked in sequence, in order to simplified characterization, in figure, eliminate the some other incoherent circuit unit in charger.
Described charge current sample unit, for sampling to charging current, obtains sampling charging current signal Ics; Sampling resistor (not indicating in figure) is in series with at the input end of described charging circuit or output terminal, namely can sample and be flowed into electric current or the electric current that flows out to battery BAT of sampling charging circuit of charging circuit by power end VCHG, for the situation that there is not additional system power consumption, the electric current being flowed into charging current by VCHG is equal with the electric current that charging circuit flows out to battery BAT; There is the situation of additional system power consumption, the electric current flowed into by VCHG may be greater than the electric current that charging circuit flows out to BAT, to this situation, sampling charging circuit should be adopted to flow out the mode of electric current to BAT, be arranged on by described sampling resistor the output terminal that charging circuit charges to battery BAT.
Described integral unit, for the sampling charging current signal that will obtain to duration of charging integration, obtains sampling charging coulomb signal Ccs;
Described comparing unit, for described sampling charging coulomb signal and preset value being compared, if exceed described preset value, then sending breakdown judge signal, otherwise not sending signal or send analysis signal; Wherein, described preset value is nA/K, and wherein n is coefficient, and value is 2.5 ~ 3.5, the nominal capacity of preferred values to be 3, A be battery, and K is charging current signal and the sampling ratio of sampling charging current signal, and such as oversampling ratio is 1000:1.Namely, when charging current is 1A, the electric current sampled is 1mA.
The output terminal of described comparing unit connects and controls described charging circuit, and when described comparing unit sends breakdown judge signal stop, described charging circuit stops exporting charging current to battery to be charged, stops and continues charging to battery.Described charging circuit is prior art, and the breakdown judge signal by receiving, controlling described charging circuit stops charging, is also that those skilled in the art utilize the technological means known to realize, therefore repeats no more its particular circuit configurations.
In a kind of preferred embodiment, described in there is rechargeable battery security testing circuit charger adopt mimic channel to realize technique scheme.
As shown in Figure 2, for the circuit theory diagrams of the charge current sample unit of charger in Fig. 1, comprise sampling resistor Rs, operational amplifier OP1 and PMOS MPS1, described sampling resistor Rs is connected on the output terminal of charging current, namely battery BAT institute to be charged in the loop, one end of described sampling resistor Rs connects an input end of described operational amplifier OP1, the other end is connected to another input end of described operational amplifier OP1 through another resistance R2, and be connected to the source electrode of described PMOS MPS1 simultaneously, the grid of described PMOS MPS1 connects the output terminal of described operational amplifier OP1, drain as the output terminal of described charge current sample unit, export sampling charging current signal Ics, and connect the input end of described integral unit.By two input ends by described operational amplifier OP1, namely B point voltage is adjusted to equal with A point voltage, because the other end (i.e. N point) of resistance Rs and the other end (i.e. N point) of resistance R2 link together, so the voltage drop on resistance Rs equals the voltage drop on resistance R2, therefore: V_Rs=V_R2, wherein V_Rs is the voltage drop on resistance Rs; V_R2 is the voltage drop on resistance R2.According to Ohm law: V_Rs=I_Rs*R_Rs, V_R2=I_R2*R_R2. wherein I_Rs are the electric current of Rs, and R_Rs is the resistance value of resistance Rs, and I_R2 is the current value of resistance R2, and R_R2 is the resistance value of resistance R2.Visible: I_R2=I_Rs* (R_Rs/R_R2).If design Rs/R2=1/1000000, namely sample than K=1000000, then I_R2=I_R2/1000000, in addition, according to Kirchhoff's law, the drain current of PMOS MPS1 equals the electric current of resistance R2.
As shown in Figure 3, for the circuit theory diagrams of integral unit in Fig. 1 and comparing unit, described integral unit comprises an electric capacity C1, a K switch 1 in parallel with described electric capacity C1 and a phase inverter inva, the input end of described phase inverter inva connects and receives a startup charging signals start, the output terminal of described phase inverter inva is connected with the control end of described K switch 1, described electric capacity C1 one end ground connection, the other end is as the input end of described integral unit, be connected with the output terminal of described charge current sample unit, receive sampling charging current signal Ics, and simultaneously as the output terminal of described integral unit, be connected with the input end of described comparing unit, export sampling charging coulomb signal Ccs.
Described comparing unit is the comparer com1 be made up of another operational amplifier, the input end of described comparer com1 is as the input end of comparing unit, be connected with the output terminal of described integration current, receive described sampling charging coulomb signal Ccs, another input end connects described preset value signal Vc, and output terminal is then as the output terminal of described comparing unit.
(charger, charger input power VCHG is not such as inserted without electricity when charger does not charge, or when being forbidden charging by control), starting charging signals start is low level, now the output signal of phase inverter inva is high level, gauge tap K1 conducting, is shorted to ground level by described electric capacity C1.When starting charging signals start and becoming high level, gauge tap K1 disconnects, and the charging current signal Ics that now samples charges to electric capacity C1.If charging coulomb signal Ccs exceedes preset value, then export breakdown judge signal stop and forbid that charging circuit charges to battery BAT, thus avoid the generation of the danger such as battery explosion.
According to B>3A/K, as being the battery of 10mA.H for nominal capacity, the charging coulomb higher limit set in the present embodiment is 10mA.H*3=30mA.H, if when current sample ratio is 1:1000000 (i.e. K=1000000), the charging charge amount upper limit of then sampling should be set to 30mA.H/1000000., and the coulomb compare threshold of described comparing unit setting is U_VC*C_C1, wherein U_VC is the magnitude of voltage of reference voltage VC (being connected to the negative input end of comparer), and C_C1 is the capacitance of electric capacity C1.In order to meet the utility model principle U_VC*C_C1=30mA.H/1000000, therefore can be designed as U_VC=3V, C_C1=36 microfarad.
In another kind of preferred embodiment, described in there is rechargeable battery security testing circuit charger adopt digital circuit technique scheme.
As shown in Figure 4, be the theory diagram of another preferred embodiment described.
Described charge current sample unit comprises sampling resistor and (does not indicate in figure, identical with a upper embodiment principle) and analog to digital converter, described sampling resistor is connected on battery BAT to be charged institute in the loop, described analog to digital converter is used for flowing through the sampling charging current signal of described sampling resistor, is converted to the digital signal characterizing sampling charging current signal Ics; Described integral unit adopts wave digital lowpass filter, for realizing the storage effect to the duration of charging to the described digital signal characterizing sampling charging current, and obtain the digital signal of sampling charging coulomb signal Ccs, described comparing unit adopts digital comparator, the sampling of digital form charging coulomb signal Ccs and preset value are compared, if exceed described preset value, then output signal failure is judged signal stop, control charging circuit and stop charging.
The utility model additionally provides a kind of rechargeable battery security testing circuit, comprise the charge current sample unit, integral unit and the comparing unit that are linked in sequence, in part in dotted line frame as shown in Figure 1, described charge current sample unit, for sampling to charging current, obtain sampling charging current signal; Described integral unit, for the sampling charging current signal that will obtain to duration of charging integration, obtains sampling charging coulomb signal; Described comparing unit, for described sampling charging coulomb signal and preset value being compared, if exceed described preset value, then sending breakdown judge signal, otherwise not sending signal or send analysis signal;
Above to rechargeable battery security testing circuit provided by the utility model and have rechargeable battery security testing circuit charger.Be described in detail, apply specific case herein and set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (7)
1. a rechargeable battery security testing circuit, is characterized in that: comprise
Charge current sample unit, for sampling to charging current, obtains sampling charging current signal;
Integral unit, for the sampling charging current signal that will obtain to duration of charging integration, obtains sampling charging coulomb signal;
Comparing unit, for described sampling charging coulomb signal and preset value being compared, if exceed described preset value, then sending breakdown judge signal, otherwise not sending signal or send analysis signal;
Described charge current sample unit, integral unit and comparing unit are linked in sequence.
2. rechargeable battery security testing circuit according to claim 1, it is characterized in that: described preset value is nA/K, wherein n is coefficient, and value is 2.5 ~ 3.5, A is the nominal capacity of battery, and K is charging current signal and the sampling ratio of sampling charging current signal.
3. rechargeable battery security testing circuit according to claim 1 and 2, it is characterized in that: described charge current sample unit comprises sampling resistor, operational amplifier and PMOS, described sampling resistor is connected on battery to be charged institute in the loop, one end of described sampling resistor connects an input end of described operational amplifier, the other end is connected to another input end of described operational amplifier through another resistance, and be connected to the source electrode of described PMOS simultaneously, the grid of described PMOS connects the output terminal of described operational amplifier, drain as the output terminal of described charge current sample unit, export sampling charging current signal, and connect the input end of described integral unit.
4. rechargeable battery security testing circuit according to claim 1 and 2, it is characterized in that: described integral unit comprise an electric capacity, one with the switch of described Capacitance parallel connection and a phase inverter, the input end of described phase inverter connects and receives startup charging signals, output terminal is connected with the control end of described switch, described electric capacity one end ground connection, the other end is as the input end of described integral unit, be connected with the output terminal of described charge current sample unit, and simultaneously as the output terminal of described integral unit, be connected with the input end of described comparing unit.
5. rechargeable battery security testing circuit according to claim 1 and 2, it is characterized in that: described comparing unit is the comparer be made up of another operational amplifier, an input end of described comparer is as the input end of comparing unit, be connected with the output terminal of described integration current, another input end connects described preset value signal, and output terminal is then as the output terminal of described comparing unit.
6. rechargeable battery security testing circuit according to claim 1 and 2, it is characterized in that: described charge current sample unit comprises sampling resistor and analog to digital converter, described sampling resistor is connected on battery to be charged institute in the loop, described analog to digital converter is used for flowing through the sampling charging current signal of described sampling resistor, is converted to the digital signal characterizing sampling charging current; Described integral unit adopts wave digital lowpass filter, for described characterize the digital signal of sampling charging current realize storage effect, described comparing unit adopts digital comparator.
7. one kind has the charger of rechargeable battery security testing circuit, comprise charging circuit, it is characterized in that: it has rechargeable battery security testing circuit as described in claim 1, comprise the charge current sample unit be linked in sequence, integral unit and comparing unit, described charge current sample unit comprises sampling resistor, described sampling resistor is connected on input end or the output terminal of described charging current, the output terminal of described comparing unit connects and controls described charging circuit, when described comparing unit sends breakdown judge signal, described charging circuit stops exporting charging current to battery to be charged.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023028934A1 (en) * | 2021-09-02 | 2023-03-09 | 宁德时代新能源科技股份有限公司 | Fault detection method and apparatus, battery management system, and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023028934A1 (en) * | 2021-09-02 | 2023-03-09 | 宁德时代新能源科技股份有限公司 | Fault detection method and apparatus, battery management system, and storage medium |
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Address after: A 530 Taihu international science and Technology Park building 214135 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: A 530 Taihu international science and Technology Park building 214135 Qingyuan Road in Jiangsu province Wuxi City District 10 layer Patentee before: Wuxi Vimicro Co., Ltd. |