CN102810882A - Circuit and method for measuring battery voltage - Google Patents
Circuit and method for measuring battery voltage Download PDFInfo
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- CN102810882A CN102810882A CN201110147429XA CN201110147429A CN102810882A CN 102810882 A CN102810882 A CN 102810882A CN 201110147429X A CN201110147429X A CN 201110147429XA CN 201110147429 A CN201110147429 A CN 201110147429A CN 102810882 A CN102810882 A CN 102810882A
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Abstract
The invention relates to a circuit and a method for measuring battery voltage. The method comprises the following steps: charging a battery by utilizing a charge power supply; stopping the charging; carrying out a plurality of times of pulse discharges on the battery through a control circuit; and utilizing the control circuit to record a stable voltage value at the time after stop of pulse discharge each time, thereby measuring the circuit of the battery voltage. The circuit for measuring battery voltage comprises a charge power supply coupled to the battery, a charge switch coupled between the battery and the charge power supply to conduct or close a charge current, a discharge resistor coupled to the battery to limit the magnitude of the discharge current, a discharge switch coupled between the discharge resistor and a ground terminal to conduct or close a discharge current, and the control circuit coupled to the charge power supply, the charge switch and the discharge switch to detect the battery voltage and command the charge switch and the discharge switch to act. The circuit provided by the invention can measure the true voltage of the battery accurately, and improve the endurance of the battery so as not to be affected by battery aging by using the true voltage as the evidence for the fact that whether the battery is charged fully or not.
Description
Technical field
The present invention relates to a kind of circuit and method that measures the real voltage of battery, so as to as the battery foundation of full charging whether, particularly a kind of circuit and method that measures cell voltage.
Background technology
In the highly developed modern times of science and technology, people highly depend on all kinds of portable electronic products, as: mobile phone, notebook computer, panel computer, PDA, mp3/mp4 player etc.In daily life, people almost need use above-mentioned article every day, to carry out big or small trival matters such as work, leisure or communication contact.So this electronic product has been necessity indispensable among the human lives.
For these portable electronic products can carried when going out and can successfully operate, rechargeable battery is the part of most critical.The endurance of battery is long more, and the frequency that the user charges is promptly low more, and then is beneficial to carrying of user.Be with, the quality of battery endurance determines the product city to account for one of key element of rate often.
In traditional rechargeable battery, like lithium battery or lead-acid battery etc., all be with the foundation of cell voltage as judgement battery capacity number, in charging process, also be whether to fill full foundation as battery with measured cell voltage.Therefore, the accuracy of cell voltage measurement is related to the length in battery endurance and life-span.
The input impedance of battery (Ri) is a key characteristic of battery, and the input impedance meeting increases with the service time of battery gradually, is the cell degradation that is commonly called as.The cell degradation degree is bigger, and then the battery endurance behind the full charging is just lower.In detail, input impedance is to be described below to the influencing factor of endurance.
Suppose that the charging current in the charging is Ic, this charging current can produce a voltage drop Vi in input impedance (Vi=Ic * Ri), wherein, Vi can be described as virtual voltage, in the presence of charging current Ic, by the measured cell voltage V of instrument
B=Vi+V
B(tr), wherein, V
B(tr) be the real voltage of battery.
If V to measure
BThe foundation of voltage full charging as whether, then the real voltage of battery is V behind the full charging
B(tr)=V
B-Vi.In other words, the real voltage of battery can be low than preset full charging pressure value, so battery full charging not in fact causes the reduction of its endurance.The above-mentioned main reason that is battery endurance deficiency, reaches cell degradation heals greatly as input impedance Ri, and endurance is then lower.Therefore, if can in charging process, measure the real voltage value (V of battery exactly
B(tr)), and as whether the foundation of full charging, promptly can not receive the influence of input impedance Ri, thereby fully fill battery full.
In addition; Except input impedance Ri; Actual equivalent input impedance is formed by capacitor C i and input impedance Ri connection in series-parallel, so can there be length in virtual voltage Vi when stopping to charge, and this equivalent input impedance is also because of cell degradation degree difference or the different differences to some extent of charge parameter.In order to measure real voltage, develop then and a kind of charge mode, its be take to charge-stop to charge-discharge-measure cell voltage after four steps stopping to discharge, in order to before beginning to detect cell voltage, utilizing discharge to eliminate virtual voltage Vi.Yet, owing to the variation of virtual voltage Vi, capacitor C i is difficult to estimate, so if continuous discharge time and the current value of desire utilization; Exactly virtual voltage Vi has just been put; And under the electric weight of not wasting battery itself, measuring the real voltage of battery, is quite difficult.
From the above, in the detection techniques of conventional battery voltage, still there are many difficulties and shortcoming, wait to overcome.
Summary of the invention
Technical problem underlying to be solved by this invention is; Overcome the above-mentioned defective that prior art exists; And a kind of circuit and method that measures cell voltage is provided, it can measure the real voltage of battery exactly, and as whether the foundation of full charging; So as to promoting the endurance of battery, and do not receive the influence of cell degradation.
The method that the present invention measures cell voltage is:
A kind of method that measures cell voltage is characterized in that, its step comprises: utilize a charge power supply that one battery is carried out a charging; Stop charging; By a control circuit this battery is carried out the several pulsed discharge; Utilize this control circuit write down each pulsed discharge after stopping as time stable voltage P (n); Whether the difference of relatively deserving time stable voltage P (n) and stable voltage P (n-1) last time by this control circuit is less than a default value; If less than this default value, then judge virtual voltage discharge off by this control circuit, and then definition to deserve time stable voltage P (n) be a battery real voltage, whether to fill full foundation as this cell voltage.
The method of aforesaid measurement cell voltage wherein writes down said step as time stable voltage P (n) and comprises: utilizes this control circuit continuous detection threshold after this subpulse discharge stops; By this control circuit relatively when the difference of the voltage V (n) that time detect and the voltage V (n-1) that last time detected whether less than one second default value; If less than this second default value, then definition is deserved the inferior voltage V (n) that detects for deserving time burning voltage P (n).
The method of aforesaid measurement cell voltage, the pulse discharge time first time in the pulsed discharge for several times wherein is according to the number adjustment of discharge times in the charging cycle each time, raises the efficiency so as to shortening the charging interval.
The method of aforesaid measurement cell voltage, wherein the record step of deserving time stable voltage P (n) is included in the back that stops to discharge and waits for that special time measures magnitude of voltage again.
The present invention in order to the circuit that measures cell voltage is:
A kind of in order to measure the circuit of cell voltage, it is characterized in that comprise: a charge power supply is coupled to this battery; One charge switch is coupled between this battery and this charge power supply, in order to conducting or charge closing electric current; One discharge resistance is coupled to this battery, in order to the size of restriction discharging current; One discharge switch is coupled between this discharge resistance and the earth terminal, in order to conducting or close discharging current; One control circuit is coupled to this charge power supply, this charge switch, and this discharge switch, in order to the detecting cell voltage and order this charge switch and this discharge switch moves.
Aforesaid in order to measure the circuit of cell voltage, wherein charge power supply be input as alternating current or direct current, be output as direct current.
Aforesaid in order to measure the circuit of cell voltage; Wherein charge power supply is output as and decides electric current output, decide voltage and exports or inner required power controlling factors (PFC); And be by the internal circuit control of this charge power supply or by this control circuit control; Or control jointly by internal circuit and this control circuit of this charge power supply, in order to the power supply of this charging current and control circuit to be provided.
The present invention in order to the circuit that measures cell voltage is:
A kind ofly it is characterized in that in order to measure the circuit of several cell voltages comprise: a battery pack is in series by these several batteries; Several multistage loop positive switch, an end is the positive pole that correspondence is coupled to these several batteries, the other end is to be coupled in one first end points CH+ mutually; Several multistage loop negative switch, an end is the negative pole that correspondence is coupled to these several batteries, the other end is to be coupled in one second end points CH-mutually; One charge power supply is coupled to this battery pack; One charge switch is coupled between the anodal end points VB+ of this rechargeable battery and this battery pack, in order to conducting or charge closing electric current; One discharge resistance is coupled to this first end points CH+, in order to the size of restriction discharging current; One discharge switch is coupled between this discharge resistance and the earth terminal, in order to conducting or close discharging current; One control circuit; Be coupled to this battery pack, this several multistage loop positive switch, this several multistage loop negative switch, this charge power supply, this charge switch and this discharge switch; Wherein this control circuit can be by the control of this several multistage loop positive switch and this several multistage loop negative switch after stopping to charge; Carry out the several pulsed discharge to each this battery, and measure the real voltage of each this battery, the foundation of full charging as whether.
Aforesaid in order to measure the circuit of cell voltage, wherein control circuit is by this first end points CH+ detecting voltage, and cuts the voltage drop of this several multistage loop positive switch and this several multistage loop negative switch, to obtain the real voltage of each this battery.
Aforesaid in order to measure the circuit of cell voltage, wherein when a multistage loop positive switch multistage loop negative switch corresponding with is unlatching, only discharge to a battery to correspondence.
The present invention in order to the circuit that measures cell voltage is:
But a kind ofly it is characterized in that in order to measure the circuit of several cell voltages and equilibrium charging comprise: a battery pack is in series by these several batteries; But the multistage loop positive switch of several two-way admittances, an end correspondence is coupled to the positive pole of these several batteries, and the other end is coupled in one first end points CH+; But the multistage loop negative switch of several two-way admittances, an end is coupled to the negative pole of these several batteries, and the other end is coupled in one second end points CH-; One charge power supply, this battery pack is coupled; One charge switch is coupled between this charge power supply and this first end points CH+, in order to conducting or charge closing electric current; One discharge resistance is coupled to this first end points CH+, in order to the size of restriction discharging current; One discharge switch is coupled between this discharge resistance and the earth terminal, in order to conducting or close discharging current; One control circuit, but but be coupled to multistage loop negative switch, this charge power supply, this charge switch, and this discharge switch of multistage loop positive switch, these several two-way admittances of this battery pack, these several two-way admittances; Wherein, under charged state, this control circuit is to be supplied power by this charge power supply, and under non-charged state, this control circuit is to be supplied power by this battery pack; Wherein, But but this control circuit is by the control to the multistage loop negative switch of the multistage loop positive switch of these several two-way admittances and these several two-way admittances; Can charge to this battery pack; Or a battery of this battery pack charged, when measuring voltage, then each this battery is carried out the several pulsed discharge, with measure the real voltage of each this battery.
Aforesaid circuit in order to the measurement cell voltage, but wherein the multistage loop positive switch of several two-way admittances comprises mechanical relay (relay) switch or a semiconductor switch.
Aforesaid circuit in order to the measurement cell voltage, but wherein the multistage loop negative switch of several two-way admittances comprises mechanical relay (relay) switch or a semiconductor switch.
Aforesaid in order to measuring the circuit of cell voltage, but wherein the multistage loop positive switch system of two-way admittance is in series by two P type MOSFET, but and multistage loop road and switch that should two-way admittance be to be in series by two N type MOSFET.
The present invention in order to the circuit that measures cell voltage is:
A kind of circuit in order to the subsystem battery voltage that measures the high-tension battery group is characterized in that, comprising: but the multistage loop positive switch of several two-way admittances, an end correspondence is coupled to the positive pole of these several batteries, and the other end is coupled in one first end points CH+; But the multistage loop negative switch of several two-way admittances, an end is coupled to the negative pole of these several batteries, and the other end is coupled in one second end points CH-; One equilibrium charging power supply, this subsystem battery pack that is coupled, it is independently to electrically isolate from a main charge power supply; One charge switch is coupled between this equilibrium charging power supply and this first end points CH+, in order to conducting or charge closing electric current; One discharge resistance is coupled to this first end points CH+, in order to the size of restriction discharging current; One discharge switch is coupled between this discharge resistance and the earth terminal, in order to conducting or close discharging current; One control circuit is supplied power by this equilibrium charging power supply, and this control circuit is to utilize an insulation interface to link up with the communication protocol and the governor circuit that configure, to form an independent subsystem.
Aforesaid circuit in order to the measurement cell voltage, but wherein the multistage loop positive switch of several two-way admittances comprises mechanical relay (relay) switch or a semiconductor switch.
Aforesaid circuit in order to the measurement cell voltage, but wherein the multistage loop negative switch of several two-way admittances comprises mechanical relay (relay) switch or a semiconductor switch.
Aforesaid in order to measuring the circuit of cell voltage, but wherein the multistage loop positive switch of two-way admittance is to be in series by two P type MOSFET, but and multistage loop road and switch that should two-way admittance be to be in series by two N type MOSFET.
The present invention is to obtain the real voltage of battery.In charging process; Be to take to charge-stop to charge-discharge-stop to discharge that to measure cell voltage be a charging cycle and the pattern of trickle charge in the back; In each charging cycle, the period that the back measures voltage of discharging of discharging-stop to be utilized the mode of (repeatedly) pulse (pulse) discharge continuously, after each pulse wave discharge stops, detecting cell voltage immediately; Voltage carries out next discharge pulse under voltage has stabilized postscript; And the steady voltage measured of more each pulse, Using such method can confirm whether the cell voltage of being measured is the battery real voltage after virtual voltage has been eliminated, whether fills full foundation as battery charge.
For the battery pack of many batteries of series connection, the present invention more utilizes multistage circuit switching device, to measure the real voltage of each single battery in the battery pack, as the foundation of full charging.
Such circuit and method can make the endurance of battery behind full charging increase, also can real once again full charging to aging battery, and the charge/discharge in the charging process can form the flow-disturbing effect of battery chemistries reaction, and the activation battery prolongs its useful life.
The invention has the beneficial effects as follows that it can measure the real voltage of battery exactly, and as whether the foundation of full charging, so as to promoting the endurance of battery, and do not receive the influence of cell degradation.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is the voltage pattern that shows the continuous impulse discharge mode;
Fig. 2 is the embodiment of the present invention in order to the circuit of measurement cell voltage;
Fig. 3 is the present invention in order to the embodiment of the cell voltage of measuring many series batteries;
Fig. 4 is but that the present invention is in order to measure the embodiment of several cell voltages and equilibrium charging;
Fig. 5 is that the present invention applies to the embodiment that battery pack is piled up;
But Fig. 6 is the multistage loop positive switch of the present invention's two-way admittance and the embodiment of negative switch.
Label declaration among the figure:
101 batteries
102 charge power supplies
103 charge switch SW1
104 discharge resistance Rd
105 discharge switch SW2
106 control circuits
201 battery pack
202 multistage loop positive switch SWn-1
203 multistage loop negative switch SWn 2
204 charge power supplies
205 charge switch SW1
206 discharge resistance Rd
207 discharge switch SW2
208 control circuits
301 battery pack
But the multistage loop positive switch SWn-1 of 302 two-way admittances
But the multistage loop negative switch SWn-2 of 303 two-way admittances
304 charge power supplies
305 charge switch SW1
306 discharge resistance Rd
307 discharge switch SW2
308 control circuits
401 subsystem battery pack
But the multistage loop positive switch SWn-1 of 402 two-way admittances
But the multistage loop negative switch SWn-2 of 403 two-way admittances
404 equilibrium charging power supplys
405 charge switch SW1
406 discharge resistance Rd
407 discharge switch SW2
408 control circuits
409 insulator interface
410 main control circuits
Embodiment
In general battery; Because the capacitance characteristic that virtual voltage Vi is constituted, inner stored electric weight is less, and the charge value that stores than battery itself is little a lot; So can be during battery discharge by virtual voltage discharge earlier, after the electric weight of treating virtual voltage has been put again by the stored corona discharge of battery itself.When discharge; Because the factor of output impedance, its voltage can descend, and voltage can go up stopping to discharge afterwards; The speed (slope) of ging up is also different because of battery condition; The voltage that must when the rise curve arrives the meadow, be measured is only the voltage of battery after discharge step, damages battery if the voltage of before the meadow, measuring, will cause over-charging of battery (over-charge) as the foundation of full charging.
Therefore; At the continuous discharge electric current of a setting with after discharge time; If battery still is in virtual voltage Vi discharge regime (that is Vi eliminates fully), the voltage that then battery stabilizes after the discharge can be than descending before the discharge; If the discharge of virtual voltage Vi after having eliminated, then the decline of discharge back magnitude of voltage is relatively low.The present invention is this specific character of utilizing battery, as judging whether the voltage of being measured is the real voltage of battery.
The present invention provides a kind of circuit and method that measures cell voltage, is to corresponding a kind of discharging current of design of each battery and continuous discharge time (pulsed discharge).After charging a period of time, stop charging and discharge immediately, stop discharge and detecting cell voltage after a bit of time of discharging; In the period that discharges into battery detecting; Be the pattern that adopts the continuous impulse discharge, for example, can wait for that when each pulsed discharge stops voltage is steady; Measuring voltage is then carried out pulsed discharge next time immediately after measuring voltage then.
In one embodiment of the invention; The voltage pattern of continuous impulse discharge mode can be as shown in Figure 1; It is after a specific discharge time, to stop discharge and full-time immediately (real time) detecting cell voltage; Cell voltage that will at every turn detect then and the preceding voltage of once measuring are done comparison, when the magnitude of voltage V (n) that detects for the n time and previous voltage V (n-1) difference during less than default value, just define the cell voltage that this Vn circulates down for this reason and stabilized; Write down this voltage and be defined as stable voltage P (1) back and carry out the next pulse discharge; Each pulse of continuous impulse discharge all can a corresponding stable voltage P (n), the stable voltage P (n) that at every turn measures can and stable voltage P (n-1) ratio of last circulation, when difference during less than set point; Just judge virtual voltage Vi this moment discharge off, then the stable voltage (n) of the P this moment battery real voltage after the charging cycle for this reason.
For the less battery of some capacity, the rapid speed that discharge back voltage stabilizes can be than oversimplifying to stopping to discharge the back cell voltage mode that measures, and the back of only need fixedly waiting for a period of time measures and gets final product.
If each continuous impulse discharge mode needs too many time pulsed discharge just can obtain the real voltage of battery; Then because too many time pulse meeting makes the charging interval lengthening; In order to improve this problem but hope that each charging cycle does not expend the real electric weight in the too many battery; Then can be designed to the blanking time of first impulse wave changeablely, second impulse wave then is fixing t1 later on.If pulse number is during greater than maximum set value; Next charging cycle then can increase a definite value with the t1 of first pulse; Just no longer increase reach the maximum of setting up to t1 after; If umber of pulse reduces t1 during less than minimum set point, little of after the minimum value of setting, no longer reducing, like this can more efficient amount arrive the real voltage of battery.
Fig. 2 is the present invention in order to an embodiment of the circuit that measures cell voltage, and it comprises: a battery 101, a charge power supply 102, a charge switch SW1 103, a discharge resistance Rd 104, a discharge switch SW2 105, an and control circuit 106.Wherein, The input of charge power supply 102 can be alternating current (AC) or direct current (DC), and output is direct current then, decides electric current to export, decide voltage output or inner required power controlling factors (PFC) etc. no matter be; All can control by the internal circuit of charge power supply 102; Or by 106 controls of the control circuit of outside, or both sides link up control, are responsible for providing the power supply of charging current and control circuit 106.Charge switch SW1 102 is coupled between battery 101 and the charge power supply 102, is responsible for conducting or charge closing electric current, is controlled by control circuit 106.Discharge resistance Rd 104 is connected on the discharge loop, and particularly, it is to be coupled between battery 101 and the discharge switch SW2 103, in order to the restriction discharging current.Discharge switch SW2 103 is coupled between discharge resistance 104 and the earth terminal, is responsible for conducting or closes discharging current.Control circuit 106 and all couplings mutually of said elements, it is in order to the detecting cell voltage, and the action of order charge switch SW1 102 and discharge switch SW2 103, is beneficial to carry out whole charging procedure.Control circuit 106 contains circuit of single-chip integrated, in order to direct measurement cell voltage; Order charge switch SW1 102 opens or closes the electric current of controlling charging or stopping to charge; Order discharge switch SW2 103 opens or closes the electric current of controlling discharge or stopping to discharge.After charging a period of time, control circuit 106 can be ordered it to stop charging and carried out a bit of time of discharge immediately, stops discharge and detecting cell voltage then.In addition, the time of continuous impulse discharge and voltage ratio etc. all can in build in the control circuit.
Utilize above-mentioned circuit and method for measurement can measure the real voltage of battery efficiently; And with this as the battery foundation of full charging whether; Just can with battery real fill full; Even in the aging battery,, also can promote endurance behind the full charging if charge with the measurement mode of this voltage.In addition; Discharging action in each charging cycle can produce the flow-disturbing effect in the chemical reaction of battery; The crystal of avoiding battery pole plates to hoard or will hoard on pole plate is eliminated gradually; The activation battery prolongs battery and reduces scrapping of battery useful life, and ball is protected and had greatest help over the ground.
In part embodiment; The present invention equally can utilize to charge-stop for the battery pack of many battery series connection and charge-discharge-charge mode of measurement cell voltage after stopping to discharge; The multistage circuit switching device of arranging in pairs or groups is carried out the method for above-mentioned continuous impulse discharge; Measure the real voltage of each single battery in the battery pack effectively, with as the battery foundation of full charging whether.
Fig. 3 is the present invention in order to the circuit embodiments of the cell voltage of measuring many series batteries, and it comprises: by the battery pack 201 of many batteries series connection, multistage loop positive switch SWn-1 202, multistage loop negative switch SWn-2 203, charge power supply 204, charge switch SW1 205, discharge resistance Rd 206, discharge switch SW2 207, and control circuit 208.Wherein, in battery pack 201, the positive pole of every battery all is coupled to a positive switch SWn-1 202, and negative pole then is to be coupled to a negative switch SWn-2 203.The other end of each positive switch SWn-1 202 all is coupled in together, that is is coupled in the first end points CH+.The other end of each negative switch SWn-2 also is to be coupled in together, that is is coupled in the second end points CH-.When one group of corresponding positive switch SWn-1 and negative switch SWn-2 conducting and other group switch when closing; Having only the loop of negative pole, negative switch SWn-2 and the second end points CH-of positive pole through the first end points CH+, positive switch SWn-1, a n battery, a n battery is conducting; In other words; Under these circumstances, n battery discharges over the ground only, and can not impact other batteries.In the present embodiment; The input of charge power supply 204 is alternating current (AC) or direct current (DC); Output be direct current then, no matter be to decide electric current output, decide that voltage is exported or inner required power controlling factors (PFC) etc., can be controlled or getting control circuit 208 by the outside controls by the internal circuit of charge power supply; Or both sides link up control, are responsible for providing the power supply of charging current and control circuit 208.In the present embodiment, charge switch SW1 205 is the anodal end points (VB+) that are serially connected in charge power supply 204 and battery pack 201, is responsible for conducting or charge closing electric current, and is controlled by control circuit 208.Discharge resistance Rd 206 is connected on the discharge loop, particularly, is to be coupled between the first end points CH+ and the discharge switch SW2 207, in order to the restriction discharging current, and by first end points CH+ execution discharge.Discharge switch SW2 207 is coupled between discharge resistance Rd 206 and the earth terminal, in order to conducting or close discharging current.Control circuit 208 is to be coupled to said elements, and in order to the detecting cell voltage, and each switch motion of order is to carry out charging procedure.
In the present embodiment; Control circuit 208 can be by the control of multistage loop positive switch SWn-1 202 and multistage loop negative switch SWn-2 203 after stopping to charge; Make the detecting mode of continuous impulse discharge to each single battery; Measure the real voltage of each battery, the foundation of full charging as whether.Wherein, control circuit 208 is that the voltage drop that cuts positive switch SWn-1 and negative switch SWn-2 again is n cell voltage by first end points CH+ detecting voltage.
Fig. 4 is an another embodiment of the present invention; But to be circuit by many series connected battery groups and equilibrium charging constitute for it, comprises: but but the negative switch SWn-2 303 of multistage loop positive switch SWn-1 302 two-way admittances of battery pack 301 two-way admittances of many battery series connection, charge power supply 304, charge switch SW1 305, discharge resistance Rd 306, discharge switch SW2 307, reach control circuit 308.Wherein, But the multistage loop positive switch SWn-1 302 and the negative switch SWn-2 303 of two-way admittance can be mechanical relay switch or semiconductor switch, and be as shown in Figure 6, but the multistage loop positive switch SWn-1 302 of two-way admittance is composed in series by two P type MOSFET; But the multistage loop negative switch SWn-2 303 of two-way admittance is composed in series by N type MOSFET; Whereby, can two-way admittance during by control circuit 308 order conductings, can two-wayly close when closing.In present embodiment; The input of charge power supply 304 can be alternating current (AC) or direct current (DC); Output is direct current then, no matter be to decide electric current to export, decide voltage output or inner required power controlling factors (PFC) etc., all can control by the internal circuit control of charge power supply or by the control circuit 308 of outside; Or both sides link up control, are responsible for providing the power supply of charging current and control circuit 308.Charge switch SW1 305 is serially connected between the anodal end points (VB+) of charge power supply 304 and battery pack 201, in order to conducting or charge closing electric current, and by control circuit 308 controls.Discharge resistance Rd 306 is connected on the discharge loop, in order to the restriction discharging current.Discharge switch SW2 307 is to be coupled between discharge resistance 306 and the earth terminal, in order to conducting or close discharging current.Control circuit 308 is to be coupled to said elements; Its power supply is by charge power supply 304 (the first end points CH+/second end points CH-) and the common supply of the power supply of battery (anodal end points VB+/negative pole end points VB-) own; The earth terminal of control circuit 308 is to be coupled to the second end points CH-under charged state; Under the state that battery is externally supplied power, the earth terminal of control circuit 308 then is to be connected to negative pole end points VB-, and it is convertible by external control; For example insert the action of AC power plug, or be powered trigger switch action of electrical equipment etc.In present embodiment; Switch SW 1=SW1-1=SWn-2=on during charging; Other switch is off; Then can whole string batteries charging be stopped the charging back and just can carry out the continuous impulse discharge, measure each single battery together with loop positive switch SWn-1302 and negative switch SWn-2 303 by control is many, be beneficial to measure the real voltage of battery.
In present embodiment; Fill full back as a cell voltage and just can select to carry out the equilibrium charging operation by switch; In other words; When wherein have a battery filled full after, promptly to the battery of full charging not by how selecting to carry out single charging, discharge, voltage metrology operation together with loop positive switch SWn-1 302 and negative switch SWn-2 303, and then positively fill full each single battery.
In present embodiment, when battery pack is externally supplied power, also can carry out the detecting voltage of single battery together with the control of loop positive switch SWn-1 302 and negative switch SWn-2 303 by how, carry out the calculating of battery low-voltage variation function and battery remaining amount.Can be with charging circuit and circuit integrated being in the same place of externally discharging by anodal end points VB+ with the common power-supplying circuit 308 of the first end points CH+.
Fig. 5 is that the present invention applies to the circuit that battery pack is piled up, and it comprises: but but the multistage loop negative switch SWn-2 403 of the multistage loop positive switch SWn-1402 two-way admittance of a sub-systems battery pack 401 two-way admittances in many of the high pressure polyphone battery pack, independently electrically isolate from equilibrium charging power supply 404, charge switch SW1 405, discharge resistance Rd 406, discharge switch SW2 407, the control circuit 408 of main charge power supply.Wherein, But the multistage loop positive switch SWn-1 402 of two-way admittance and negative switch SWn-2 403 can be mechanical relay switch or become conductor switch, and for example, positive switch SWn-1 402 is composed in series by two P type MOSFET; Negative switch SWn-2 403 is composed in series by N type MOSFET; Whereby, can two-way admittance during control circuit 408 order conductings, then can two-wayly close when closing.In present embodiment; The input that independently electrically isolates from the equilibrium charging power supply 404 of main charge power supply can be alternating current (AC) or direct current (DC); Output is direct current then, no matter be to decide electric current to export, decide voltage output or inner required power controlling factors (PFC) etc., all can control by the internal circuit control of individually balanced charge power supply 404 or by the control circuit 408 of outside; Or both sides link up control, in order to the power supply of equilibrium charging electric current and control circuit 408 to be provided.Wherein, this power supply only provides the power supply of equilibrium charging electric current and control circuit 408.In present embodiment, charge switch SW1 405 is serially connected between the equilibrium charging power supply 404 and the first end points CH+, in order to conducting or close the equilibrium charging electric current, and is by 408 controls of control circuit.Discharge resistance Rd 406 is connected on the discharge loop, in order to the restriction discharging current.Discharge switch SW2 407 is to be coupled between discharge resistance Rd 406 and the earth terminal, in order to conducting or close discharging current.Control circuit 408 is by 404 power supplies of equilibrium charging power supply, and its insulation interface 409 capable of using (for example photo-couple) is linked up with the communication protocol (protocol) and the main control circuit 410 that configure.
Can form an autonomous system by above-mentioned design; Independently the equilibrium charging power circuit can be linked up with main control circuit; The voltage that when main charging current stops, carrying out pulsed discharge measures; The notice main control circuit can charge to the lower battery of cell voltage under main charging current for charging synchronously after accomplishing, and quickens each battery and reaches the close purpose of voltage.Can detect of the calculating of the voltage of each battery during discharge at any time as the foundation and the battery remaining amount of low-voltage variation.
Foregoing circuit is for the battery pack that the high pressure demand is arranged (ex: the battery pack of electric motor car) can bring higher endurance and life-span, and then promote its surcharge.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (18)
1. a method that measures cell voltage is characterized in that, its step comprises:
Utilize a charge power supply that one battery is carried out a charging;
Stop charging;
By a control circuit this battery is carried out the several pulsed discharge;
Utilize this control circuit write down each pulsed discharge after stopping as time stable voltage P (n);
Whether the difference of relatively deserving time stable voltage P (n) and stable voltage P (n-1) last time by this control circuit is less than a default value;
If less than this default value, then judge virtual voltage discharge off by this control circuit, and then definition to deserve time stable voltage P (n) be a battery real voltage, whether to fill full foundation as this cell voltage.
2. the method for measurement cell voltage according to claim 1 is characterized in that, writes down said step as time stable voltage P (n) and comprises:
Utilize this control circuit at this continuous detection threshold in subpulse discharge stopping back;
By this control circuit relatively when the difference of the voltage V (n) that time detect and the voltage V (n-1) that last time detected whether less than one second default value;
If less than this second default value, then definition is deserved the inferior voltage V (n) that detects for deserving time burning voltage P (n).
3. the method for measurement cell voltage according to claim 1; It is characterized in that; The pulse discharge time first time in the said several pulsed discharge is the number adjustment according to discharge times in the charging cycle each time, raises the efficiency so as to shortening the charging interval.
4. the method for measurement cell voltage according to claim 1 is characterized in that, the step that said record deserves time stable voltage P (n) is included in the back that stops to discharge and waits for that special time measures magnitude of voltage again.
5. the circuit in order to the measurement cell voltage is characterized in that, comprising:
One charge power supply is coupled to this battery;
One charge switch is coupled between this battery and this charge power supply, in order to conducting or charge closing electric current;
One discharge resistance is coupled to this battery, in order to the size of restriction discharging current;
One discharge switch is coupled between this discharge resistance and the earth terminal, in order to conducting or close discharging current;
One control circuit is coupled to this charge power supply, this charge switch, and this discharge switch, in order to the detecting cell voltage and order this charge switch and this discharge switch moves.
6. according to claim 5ly it is characterized in that in order to measure the circuit of cell voltage, said charge power supply be input as alternating current or direct current, be output as direct current.
7. according to claim 6 in order to measure the circuit of cell voltage; It is characterized in that; Said charge power supply is output as decides electric current output, decide voltage and exports or inner required power controlling factors (PFC); And be by the internal circuit control of this charge power supply or by this control circuit control, or control jointly, in order to the power supply of this charging current and control circuit to be provided by internal circuit and this control circuit of this charge power supply.
8. one kind in order to measure the circuit of several cell voltages, it is characterized in that, comprising:
One battery pack is in series by these several batteries;
Several multistage loop positive switch, an end is the positive pole that correspondence is coupled to these several batteries, the other end is to be coupled in one first end points CH+ mutually;
Several multistage loop negative switch, an end is the negative pole that correspondence is coupled to these several batteries, the other end is to be coupled in one second end points CH mutually;
One charge power supply is coupled to this battery pack;
One charge switch is coupled between the anodal end points VB+ of this rechargeable battery and this battery pack, in order to conducting or charge closing electric current;
One discharge resistance is coupled to this first end points CH+, in order to the size of restriction discharging current;
One discharge switch is coupled between this discharge resistance and the earth terminal, in order to conducting or close discharging current;
One control circuit; Be coupled to this battery pack, this several multistage loop positive switch, this several multistage loop negative switch, this charge power supply, this charge switch and this discharge switch; Wherein this control circuit can be by the control of this several multistage loop positive switch and this several multistage loop negative switch after stopping to charge; Carry out the several pulsed discharge to each this battery, and measure the real voltage of each this battery, the foundation of full charging as whether.
9. according to claim 8 in order to measure the circuit of cell voltage; It is characterized in that; Said control circuit is by this first end points CH+ detecting voltage; And cut the voltage drop of this several multistage loop positive switch and this several multistage loop negative switch, to obtain the real voltage of each this battery.
10. the circuit in order to the measurement cell voltage according to claim 8 is characterized in that, when a multistage loop positive switch multistage loop negative switch corresponding with is unlatching, only discharges to the battery to correspondence.
But 11. one kind in order to measure the circuit of several cell voltages and equilibrium charging, it is characterized in that, comprising:
One battery pack is in series by these several batteries;
But the multistage loop positive switch of several two-way admittances, an end correspondence is coupled to the positive pole of these several batteries, and the other end is coupled in one first end points CH+;
But the multistage loop negative switch of several two-way admittances, an end is coupled to the negative pole of these several batteries, and the other end is coupled in one second end points CH-;
One charge power supply, this battery pack is coupled;
One charge switch is coupled between this charge power supply and this first end points CH+, in order to conducting or charge closing electric current;
One discharge resistance is coupled to this first end points CH+, in order to the size of restriction discharging current;
One discharge switch is coupled between this discharge resistance and the earth terminal, in order to conducting or close discharging current;
One control circuit, but but be coupled to multistage loop negative switch, this charge power supply, this charge switch, and this discharge switch of multistage loop positive switch, these several two-way admittances of this battery pack, these several two-way admittances;
Wherein, under charged state, this control circuit is to be supplied power by this charge power supply, and under non-charged state, this control circuit is to be supplied power by this battery pack;
Wherein, But but this control circuit is by the control to the multistage loop negative switch of the multistage loop positive switch of these several two-way admittances and these several two-way admittances; Can charge to this battery pack; Or a battery of this battery pack charged, when measuring voltage, then each this battery is carried out the several pulsed discharge, with measure the real voltage of each this battery.
12. according to claim 11 in order to measure the circuit of cell voltage, it is characterized in that, but the multistage loop positive switch of said several two-way admittances comprises mechanical relay (relay) switch or a semiconductor switch.
13. according to claim 11 in order to measure the circuit of cell voltage, it is characterized in that, but the multistage loop negative switch of said several two-way admittances comprises mechanical relay (relay) switch or a semiconductor switch.
14. it is according to claim 11 in order to measure the circuit of cell voltage; It is characterized in that; But the multistage loop positive switch of said two-way admittance system is in series by two P type MOSFET, but and multistage loop road and switch that should two-way admittance be to be in series by two N type MOSFET.
15. the circuit in order to a subsystem battery voltage of measurement high-tension battery group is characterized in that, comprising:
But the multistage loop positive switch of several two-way admittances, an end correspondence is coupled to the positive pole of these several batteries, and the other end is coupled in one first end points CH+;
But the multistage loop negative switch of several two-way admittances, an end is coupled to the negative pole of these several batteries, and the other end is coupled in one second end points CH-;
One equilibrium charging power supply, this subsystem battery pack that is coupled, it is independently to electrically isolate from a main charge power supply;
One charge switch is coupled between this equilibrium charging power supply and this first end points CH+, in order to conducting or charge closing electric current;
One discharge resistance is coupled to this first end points CH+, in order to the size of restriction discharging current;
One discharge switch is coupled between this discharge resistance and the earth terminal, in order to conducting or close discharging current;
One control circuit is supplied power by this equilibrium charging power supply, and this control circuit is to utilize an insulation interface to link up with the communication protocol and the governor circuit that configure, to form an independent subsystem.
16. according to claim 15 in order to measure the circuit of cell voltage, it is characterized in that, but the multistage loop positive switch of said several two-way admittances comprises mechanical relay (relay) switch or a semiconductor switch.
17. according to claim 15 in order to measure the circuit of cell voltage, it is characterized in that, but the multistage loop negative switch of said several two-way admittances comprises mechanical relay (relay) switch or a semiconductor switch.
18. it is according to claim 15 in order to measure the circuit of cell voltage; It is characterized in that; But the multistage loop positive switch of said two-way admittance is to be in series by two P type MOSFET, but and multistage loop road and switch that should two-way admittance be to be in series by two N type MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110147429XA CN102810882A (en) | 2011-06-02 | 2011-06-02 | Circuit and method for measuring battery voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110147429XA CN102810882A (en) | 2011-06-02 | 2011-06-02 | Circuit and method for measuring battery voltage |
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| CN102810882A true CN102810882A (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110147429XA Pending CN102810882A (en) | 2011-06-02 | 2011-06-02 | Circuit and method for measuring battery voltage |
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| CN103633705A (en) * | 2013-12-10 | 2014-03-12 | Tcl通讯（宁波）有限公司 | Terminal and method of precisely acquiring battery voltage by discharging during charging |
| CN106199440A (en) * | 2016-06-30 | 2016-12-07 | 深圳市科列技术股份有限公司 | A kind of battery management system and the voltage sampling circuit of use, method |
| CN111142031A (en) * | 2019-12-30 | 2020-05-12 | 深圳移航通信技术有限公司 | Battery capacity updating method and equipment |
| CN111527004A (en) * | 2018-11-27 | 2020-08-11 | 株式会社Lg化学 | Method for starting battery driving system and recognizing external system off state using the same |
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Application publication date: 20121205 |