CN109669144A - The method of secondary cell state detector and detection secondary cell state - Google Patents
The method of secondary cell state detector and detection secondary cell state Download PDFInfo
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- 238000000034 method Methods 0.000 title abstract description 12
- 238000001514 detection method Methods 0.000 title description 38
- 239000003990 capacitor Substances 0.000 abstract description 52
- 210000004027 cell Anatomy 0.000 description 173
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
提供一种二次电池状态检测器和检测二次电池状态的方法，其能够使用检测二次电池状态的差分放大电路检测二次电池的电压。第一电容器(C1)保持第一状态下的二次电池(Ce1至Ce3)的电压。由第一电容器保持的二次电池的电压和第二状态下的二次电池的电压输入到差分放大电路(16)。μCOM(19)基于从差分放大电路(16)输出的第一状态下的二次电池的电压与第二状态下的二次电池的电压之间的差分电压检测电池状态。转换开关(SW1)和开关单元(12)将差分放大电路(16)的输入从第一和第二状态下的二次电池的电压切换为二次电池的电压和基准电压(Vref)。μCOM基于从差分放大电路输出的二次电池的电压与基准电压(Vref)之间的差分电压检测二次电池的电压。
Provided are a secondary battery state detector and a method of detecting the state of the secondary battery that can detect the voltage of the secondary battery using a differential amplifier circuit that detects the state of the secondary battery. The first capacitor (C1) holds the voltage of the secondary batteries (Ce1 to Ce3) in the first state. The voltage of the secondary battery held by the first capacitor and the voltage of the secondary battery in the second state are input to a differential amplifier circuit (16). The μCOM (19) detects the battery state based on the differential voltage between the voltage of the secondary battery in the first state and the voltage of the secondary battery in the second state output from the differential amplifier circuit (16). A changeover switch (SW1) and a switch unit (12) switch the input of the differential amplifier circuit (16) from the voltage of the secondary battery in the first and second states to the voltage of the secondary battery and the reference voltage (Vref). The μCOM detects the voltage of the secondary battery based on the differential voltage between the voltage of the secondary battery output from the differential amplifier circuit and the reference voltage (Vref).
Description
Technical field
The present invention relates to a kind of secondary cell state detectors and a kind of method for detecting secondary cell state.
Background technique
As the power supply of motor, secondary cell as such as lithium ion chargeable battery or rechargeable Ni-H 2 battery is pacified
On the various vehicles as such as electric vehicle (EV) or hybrid vehicle (HEV).In EV or HEV, dozens of or
Hundreds of secondary cells are connected in series, and detect the both end voltage of each secondary cell.The both end voltage of secondary cell is to sentence
Break fully charged or over-discharge important detected value.Accordingly, there exist following problems: if broken down in detection circuit,
And even if a secondary cell in multiple secondary cells cannot be detected, all charge and discharges are electrically operated must also to be stopped.
In addition, as the method for indicating the internal resistance of the index of degradation of secondary cell is calculated, such as propose patent
Method described in document 1.In the secondary cell state detector described in patent document 1, keep in the capacitor respectively
The cell voltage of discharge condition and electric discharge halted state, and determined between the cell voltage kept using differential amplifier circuit
Then differential voltage determines internal resistance (=secondary cell state) according to the differential voltage.However, in traditional secondary cell state
In detector, when detection circuit failure, no detection circuit not can determine that the both end voltage of secondary cell then.
List of documents
Patent document
Patent document 1:JP 2014-219311A
Summary of the invention
Technical problem
The present invention is invented in view of background above, and the object of the present invention is to provide a kind of secondary cell state detectors
With a kind of method for detecting secondary cell state, the differential amplifier circuit of detection secondary cell state is able to use to detect two
The both end voltage of primary cell.
Issue-resolution
According to an aspect of the present invention, a kind of condition tester for battery is provided, comprising:
Capacitor, the capacitor are used to keep the both end voltage of the secondary cell under first state；
Differential amplifier circuit, under the both end voltage and the second state of the secondary cell kept by the capacitor
The both end voltage of the secondary cell is input into the differential amplifier circuit；And
State detecting section, the state detecting section are used for the both end voltage based on the secondary cell under the first state
Differential electrical between the both end voltage of the secondary cell under second state, being exported from the differential amplifier circuit
Pressure detects the battery status of the secondary cell,
The condition tester for battery further include:
Switching part, the switching part are used for the input of the differential amplifier circuit from the first state and second shape
The both end voltage of the secondary cell under state is switched to the both end voltage and reference voltage of the secondary cell；And
First voltage test section, the first voltage test section are used for based on exporting from the differential amplifier circuit, described
Differential voltage between the both end voltage of secondary cell and the reference voltage detects the both end voltage of the secondary cell.
Preferably, the reference voltage is the constant voltage exported from constant voltage source.
Preferably, the first voltage test section adjusts the constant voltage exported from the constant voltage source, so that
The differential voltage within a predetermined range, and detects institute based on the differential voltage after the adjusting of the constant voltage
State the both end voltage of secondary cell.
Preferably, multiple secondary cells are set,
The condition tester for battery further include:
Second voltage test section, the second voltage test section are used to detect each secondary electricity in the multiple secondary cell
The both end voltage in pond；And
Failure detecting section, the failure detecting section is for searching the failure due to the second voltage test section and cannot be detected
The secondary cell of survey,
Wherein, the reference voltage is by the both end voltage of the secondary cell of second voltage test section detection.
Preferably, when with multiple secondary cells, and the both ends of each secondary cell in the multiple secondary cell
Voltage can by the second voltage test section detect when, the first voltage test section by differential voltage within a predetermined range
The both end voltage of secondary cell be set as the reference voltage.
According to another aspect of the present invention, a kind of method detecting battery status is provided, comprising the following steps:
The both end voltage of the secondary cell under first state is kept using capacitor；
By the both end voltage of the secondary cell kept by the capacitor and in the second condition described secondary
The both end voltage of battery is input to differential amplifier circuit；And
Both end voltage based on the secondary cell under the first state with it is described secondary under second state
Differential voltage between the both end voltage of battery detects battery status, and the differential voltage is exported from the differential amplifier circuit,
The method also includes:
By the input of the differential amplifier circuit from the secondary cell under the first state and second state
Both end voltage be switched to the both end voltage and reference voltage of the secondary cell；And
Differential voltage between both end voltage and the reference voltage based on the secondary cell detects the secondary electricity
The both end voltage in pond, the differential voltage are exported from the differential amplifier circuit.
The effect of invention
It is able to detect secondary according to the above by using the differential amplifier circuit for detecting secondary cell state
The both end voltage of battery.
Detailed description of the invention
Fig. 1 is the circuit diagram for showing the secondary cell state detector of first embodiment according to the present invention；
Fig. 2 is shown using as the secondary battery ends of the μ COM of the component of the secondary cell state detector of Fig. 1
The flow chart of the detection processing step of voltage；
Fig. 3 is the circuit diagram for showing the secondary cell state detector of second embodiment according to the present invention；And
Fig. 4 is shown using as the secondary battery ends of the μ COM of the component of the secondary cell state detector of Fig. 3
The flow chart of the detection processing step of voltage.
List of reference signs
1 test circuit for cell status
16 differential amplifier circuits
18CVS (second voltage test section, failure detecting section)
19 μ COM (state detecting section, first voltage test section)
C1 first capacitor device (capacitor)
Ce1-Ce3 secondary cell
Vm differential voltage
Specific embodiment
(first embodiment)
Secondary cell state detector according to first embodiment is described hereinafter with reference to Fig. 1.The secondary electricity of the embodiment
Pond state detector 1 is for example mounted on electric vehicle, and detects the state of multiple secondary cell Ce1 to Ce3 respectively, described
Multiple secondary cell Ce1 to Ce3 constitute shown in FIG. 1 and including the assembled battery 2 in electric vehicle.Secondary cell Ce1
It is serially connected to Ce3.
As shown in Figure 1, the secondary cell state detector 1 of the embodiment includes: first and second capacitor C1, C2；Base
Reference voltage source 8；Change-over switch SW1 and switch unit 12；Charge and discharge portion 13；Voltage detection department 14；A/D converter 15；Difference is put
Big circuit 16；A/D converter 17；CVS18 and microcomputer (hereinafter referred to as μ COM) 19.
First and second capacitor C1, C2 are for being maintained under two states (for example, charged state and discharge condition)
Secondary cell Ce1 to Ce3 both end voltage capacitor.In addition, first capacitor device C1 and the second capacitor C2 are for dividing
It Bao Chi not the both end voltage of secondary cell Ce1 to Ce3 and the capacitor of reference voltage Vref.The electricity of first capacitor device C1 and second
Container C2 is connected to by the switch unit 12 being hereinafter described and is selected from multiple secondary cell Ce1 to Ce3 and reference voltage source 8
One of.
In addition, an electrode of first capacitor device C1 be connected to it is defeated as two of the differential amplifier circuit 16 being hereinafter described
One in entering input+input.An electrode of second capacitor C2 is connected to as the differential amplifier circuit being hereinafter described
Another input in two of 16 inputs-input.
Reference voltage source 8 is for example made of constant voltage source, and outputting reference voltage Vref.By the way, in the implementation
In example, use the adjustable well known constant voltage source of reference voltage Vref (=constant voltage) as reference voltage source 8.
Change-over switch SW1 is made of the switch for switching c terminal between a terminal and b terminal.A terminal is connected to
An electrode of first capacitor device C1 and differential amplifier circuit 16+input.B terminal is connected to an electricity of the second capacitor C2
Pole and differential amplifier circuit 16-input.C terminal is connected to the e+ terminal for the change-over switch SW+ being hereinafter described.Change-over switch
SW1 selection one of first capacitor device C1 and the second capacitor C2 and the e+ terminal for being connected to change-over switch SW+.
Switch unit 12 is made of two change-over switches SW+, SW-.Change-over switch SW+ by for make e+ terminal a+, b+,
The switch switched between c+, d+ terminal is constituted.A+ is respectively connected to the anode of secondary cell Ce1 to Ce3 to c+ terminal.D+ terminal
It is connected to the anode of reference voltage source 8.Change-over switch SW+ is selected in multiple secondary cell Ce1 to Ce3 and reference voltage source 8
The anode of one, and the anode is connected to by an electrode of change-over switch SW1 capacitor C1, C2 selected.
Change-over switch SW- is made of the switch for switching e- terminal between a-, b-, c-, d- terminal.A- is to the end c-
Son is respectively connected to the cathode of secondary cell Ce1 to Ce3.D- terminal is connected to the cathode of reference voltage source 8.Change-over switch SW-
The cathode of one of multiple secondary cell Ce1 to Ce3 and reference voltage source 8 is selected, and the cathode is connected to capacitor
Another electrode of C1, C2.
Voltage detection department 14 is the circuit for detecting the both end voltage of assembled battery 2.A/D converter 15 will be examined by voltage
The both end voltage for the assembled battery 2 that survey portion 14 is detected is converted to digital value and provides the digital value to μ COM19.
Charge and discharge portion 13 is connected to the two poles of the earth of assembled battery 2, and is set as in the secondary cell for constituting assembled battery 2
Apply scheduled charging current Ic and discharge current Id during the charging and discharging of Ce1 to Ce3.Charge and discharge portion 13 is connected to hereinafter
The μ COM19 of description, and correspond to the control signal from μ COM19, by apply charging current Ic to secondary cell Ce1 extremely
Ce3 charging, and discharged by applying discharge current Id secondary cell Ce1 to Ce3.
Differential amplifier circuit 16 is the well known differential amplifier circuit by the differential voltage output between+input and-input.
The differential voltage Vm exported by differential amplifier circuit 16 is converted to digital value by A/D converter 17, and providing to μ COM19 should
Digital value.
CVS18 as second voltage test section is sensed by the detection electricity of the both end voltage of secondary cell Ce1 to Ce3
Road is constituted, and the CVS18 will test result and sequentially be output to μ COM19.
μ COM19 is made of the well known microcomputer with CPU, ROM, RAM etc..μ COM19 is used as state detecting section, and
And by the control of the on-off of change-over switch SW1 and switch unit 12 and by control charge and discharge portion 13, and execute secondary cell
The detection processing of the internal resistance of Ce1 to Ce3.
In the detection processing of internal resistance, in the first state, the e+ terminal of change-over switch SW+ is connected to the end a+ by μ COM19
The e- terminal of change-over switch SW- is connected to a- terminal, and the c terminal of change-over switch SW1 is connected to a terminal by son.From
And μ COM19 makes the both end voltage of first capacitor device C1 holding secondary cell Ce1 in the first state.Then, in the second shape
Under state, μ COM19 makes the c terminal of change-over switch SW1 be connected to b terminal.To which, μ COM19 makes in the second condition second
The both end voltage of capacitor C2 holding secondary cell Ce1.Then, make the secondary cell Ce1's under first state and the second state
Input that both end voltage is separately input to differential amplifier circuit 16+input and-.
Herein, first state and the second state indicate the different state of the electric current for flowing through secondary cell Ce1 to Ce3.At this
In embodiment, first state is the state of charging current Ic flowing, and the second state is the state of discharge current Id flowing.μ
COM19 controls charge and discharge portion 13 based on the detection voltage from voltage detection department 14, and applies to secondary cell Ce1 to Ce3
Charging current Ic and discharge current Id.
In addition, μ COM19 obtains differential voltage Vm in the detection processing of internal resistance, the internal resistance of secondary cell Ce1 is detected, and
And detect the state of secondary cell Ce1.When being described in detail, in this embodiment, with following formula (1) expression in charging shape
The voltage Vc1 at the both ends secondary cell Ce1 under state.
Vc1=Ve1+r1*Ic (1)
Wherein, Ve1 is the electromotive force of secondary cell Ce1, and r1 is the internal resistance of secondary cell Ce1.
In contrast, the voltage Vd1 at the both ends secondary cell Ce1 with following formula (2) expression in the discharged condition.
Vd1=Ve1-r1*Id (2)
Therefore, the differential voltage Vm exported from differential amplifier circuit 16 corresponds to Vc1-Vd1=r1* (Ic+Id).If filled
Electric current Ic and discharge current Id are previously known, then can determine internal resistance r1 according to differential voltage Vm.Analogously it is possible to determine two
Internal resistance r2, r3 of primary cell Ce2, Ce3.
In addition, the on/off of μ COM19 control change-over switch SW1 and switch unit 12, and execute secondary cell Ce1 extremely
The detection processing of the both end voltage of Ce3.The inspection of the both end voltage of secondary cell can be executed in the failure for detecting CVS18
Survey processing.Alternatively, the detection processing can be executed in order to detect the failure of CVS18.
In the detection processing of the both end voltage of secondary cell, μ COM19 controls charge and discharge portion 13 first to be stopped charging or puts
Electricity.By the way, it does not need to stop charging current or discharge current, that is, do not need for charging current or discharge current to be zeroed.Charging
Electric current or discharge current are necessarily zero, as long as the voltage drop that internal resistance r1 is generated into r3 is acceptable.Then, μ
The e+ terminal of change-over switch SW+ is connected to a+ terminal by COM19, and the e- terminal of change-over switch SW- is connected to a- terminal, and
The c terminal of change-over switch SW1 is connected to a terminal.To which μ COM19 makes first capacitor device C1 keep secondary cell Ce1 two
The voltage at end.
Then, the e+ terminal of change-over switch SW+ is connected to d+ terminal by μ COM19, and the e- terminal of change-over switch SW- is connected
It is connected to d- terminal, and the c terminal of change-over switch SW1 is connected to b terminal.To which μ COM19 protects the second capacitor C2
Hold reference voltage Vref.Then, the voltage at the both ends secondary cell Ce1 and reference voltage Vref are input to differential amplification electricity respectively
Road 16+input and-input.
In addition, μ COM19 obtains differential voltage Vm at this time, and detect the both end voltage of secondary cell Ce1.When detailed
When illustrating, with the differential voltage Vm of following formula (3) expression at this time.
Vm=(Vc1-Vref) * Av (3)
Wherein, Av is the gain of differential amplifier circuit 16.
Therefore, because known gain Av and reference voltage Vref, so μ COM19 can determine two according to differential voltage Vm
The voltage Vc1 at the both ends primary cell Ce1.Similarly, voltage Vc2, Vc3 of secondary cell Ce2, Ce3 be can determine.
Then, the secondary cell using secondary cell state detector 1 that the flow chart description of reference Fig. 2 is substantially described
Both end voltage detection processing process details.μ COM19 first connects the both ends of secondary cell Cen and first capacitor device C1
Meet (step S1).
Then, μ COM19 waits the predetermined time, so that the both end voltage of first capacitor device C1 becomes equal to secondary cell Cen
Then reference voltage source 8 is connect (step S2) with the second capacitor C2 by the both end voltage Vcn of (n is initially set 1).To,
The both end voltage of secondary cell Cen and reference voltage Vref are input to differential amplifier circuit 16 respectively+input and-input.
Then, μ COM19 obtains the differential voltage Vm of differential amplifier circuit 16, and judges whether Vm is greater than first threshold
Vthmax (step S3).As differential voltage Vm > first threshold Vthmax (being "Yes" in step S3), because having voltage Vcn
It may may be saturated a possibility that such much larger than the output of reference voltage Vref and A/D converter 17, so μ COM19 makes
Reference voltage Vref increases predetermined amount (step S8), is then return to step S1.
On the contrary, when differential voltage Vm is equal to or less than first threshold Vthmax (in step S3 be "No"), then μ COM19
Judge whether Vm is less than second threshold Vthmin (step S4).As differential voltage Vref < second threshold Vthmin (in step S4
For "Yes"), μ COM19 judges voltage Vcn much smaller than reference voltage Vref and low precision, and μ COM19 subtracts reference voltage Vref
Small predetermined amount (step S9), and return to step S1.
It (is "No" and step in step S3 as second threshold Vthmin≤differential voltage Vm≤first threshold Vthmax
It is "No" in S4), μ COM19 calculates voltage Vcn (step S5) according to differential voltage Vm.Then, μ COM19 is incremented by n (step S6),
And judge whether n=3 (step S7).As n ≠ 3 (being "No" in step S7), μ COM19 judgement does not detect composition assembling electricity
All secondary cell Ce1 in pond 2 to the both ends Ce3 voltage Vc1 to Vc3, and return to step S1.
On the contrary, μ COM19 judgement, which has detected, constitutes all secondary of assembled battery 2 as n=3 (being "Yes" in step S7)
Battery Ce1 and is ended processing to the voltage Vc1 to Vc3 at the both ends Ce3.
It, can be by difference by using change-over switch SW1 and switch unit 12 as switch portion according to above-mentioned first embodiment
The input of amplifying circuit 16 is switched to secondary from the both end voltage of the secondary cell Ce1 to Ce3 under first state and the second state
The both end voltage and reference voltage Vref of battery Ce1 to Ce3.Then, μ COM19 is based on exported from differential amplifier circuit 16
Internal resistance (the shape of differential voltage Vm detection battery between the both end voltage of the secondary cell Ce1 to Ce3 of one state and the second state
State).
In addition, the differential voltage between both end voltage of the μ COM19 based on secondary cell Ce1 to Ce3 and reference voltage Vref
The both end voltage of Vm detection secondary cell Ce1 to Ce3.To use the difference of the internal resistance for detecting secondary cell Ce1 to Ce3
Divide amplifying circuit 16, is able to detect the both end voltage of secondary cell Ce1 to Ce3.Therefore, if CVS18 failure, because can
The both end voltage of secondary cell Ce1 to Ce3 is detected, so the charging and discharging of stopping secondary cell Ce1 to Ce3 are not needed, and
And vehicle can continue to travel.
In addition, by comparing CVS18 detection secondary cell Ce1 to Ce3 both end voltage with use differential amplifier circuit
The both end voltage of the secondary cell Ce1 to Ce3 of 16 detections, is able to carry out the fault diagnosis of CVS18 and condition tester for battery 1.
In addition, reference voltage Vref is the constant voltage exported from constant voltage source according to above-mentioned first embodiment.From
And the detection accuracy of the both end voltage of secondary cell Ce1 to Ce3 can be further increased.
In addition, as shown in step S3, S4 and S9, μ COM19 adjusts defeated from reference voltage source 8 according to above-mentioned first embodiment
Reference voltage Vref out, so that differential voltage Vm is within a predetermined range (that is, first threshold Vthmax > Vm > second threshold
Vthmin).Then, the both end voltage of differential voltage Vm detection secondary cell Ce1 to Ce3 of the μ COM19 based on adjusting.To prevent
The only output saturation or too small of A/D converter 17, and the both end voltage of secondary cell Ce1 to Ce3 can be further increased
Detection accuracy.
By the way, according to above-mentioned first embodiment, assembled battery 2 is made of three secondary cell Ce1 to Ce3.However, this
It invents without being limited thereto.One or three or more secondary cell can be set.
In addition, in the above-described first embodiment, being provided with two capacitors C1 and C2.However, the invention is not limited thereto.It can
The both end voltage that a capacitor is used to keep the secondary cell Ce1 to Ce3 under first state is arranged, and under the second state
The both end voltage of secondary cell Ce1 to Ce3 can be directly inputted to differential amplifier circuit 16.
In addition, the switch portion being made of change-over switch SW1 and switch unit 12 as implemented in the first embodiment is one
Example.Switch portion can be switched to secondary electricity from the both end voltage of the secondary cell Ce1 to Ce3 under first state and the second state
The both end voltage and reference voltage Vref of pond Ce1 to Ce3.
In addition, in the above-described first embodiment, μ COM19 adjusts the reference voltage Vref exported from reference voltage source 8, make
Obtain differential voltage Vm within a predetermined range (that is, first threshold Vthmax > Vm > second threshold Vthmin).However, the present invention is unlimited
In this.The adjusting of reference voltage Vref is not necessary.
In addition, in the above-described first embodiment, by controlling charge and discharge portion 13, secondary cell Ce1 to Ce3 using μ COM19
In first state (state of charging current Ic flowing) and the second state (state of discharge current Id flowing).However, this hair
It is bright without being limited thereto.Can be used with vehicle load driving it is associated charging and discharging electric current variation.That is, being charged and discharged
State before the variation of electric current can be first state, and being charged and discharged the state after the variation of electric current can be the
Two-state.
(second embodiment)
Then, secondary cell state detector 1 according to the second embodiment will be described with reference to Fig. 3.In Fig. 3, and
The similar component of component of the secondary cell state detector 1 of the Fig. 1 described in the first embodiment will be with identical with reference to mark
Note expression, and by description is omitted.
As shown in figure 3, the secondary cell state detector 1 of second embodiment includes: first capacitor device C1 and the second capacitor
Device C2；Change-over switch SW1 and switch unit 12；Charge and discharge portion 13；Voltage detection department 14；A/D converter 15；Differential amplifier circuit
16；A/D converter 17；CVS18 and μ COM19.In a second embodiment, it is not provided with reference voltage source 8.
Because first capacitor device C1 and the second capacitor C2 and change-over switch SW1 are similar to above-mentioned first embodiment,
So herein by description is omitted.Switch unit 12 is made of two change-over switches SW+, SW-.Change-over switch SW+ by with
It is constituted in the switch for switching e+ terminal between a+, b+, c+ terminal.A+ terminal to c+ terminal is respectively connected to secondary cell
The anode of Ce1 to Ce3.Change-over switch SW+ selects the anode of a secondary cell of multiple secondary cell Ce1 into Ce3, and
The anode is connected to by an electrode of change-over switch SW1 capacitor C1, C2 selected.
Change-over switch SW- is made of the switch for switching e- terminal between a-, b-, c- terminal.A- is to c- terminal
It is respectively connected to the cathode of secondary cell Ce1 to Ce3.Change-over switch SW- selects one into Ce3 of multiple secondary cell Ce1
The cathode of secondary cell, and the cathode is connected to another electrode of capacitor C1, C2.
CVS18 as second voltage test section be sensed by secondary cell Ce1 to the both ends Ce3 voltage detection electricity
Road is constituted, and the CVS18 will test result and sequentially be output to μ COM19.There are following situations: due to such as internal switch event
Barrier etc., CVS18 cannot detect the both end voltage of all secondary cell Ce1 to Ce3.CVS18 includes for example well known open circuit detection
Circuit, and can determine some secondary cell Ce1 to Ce3 that cannot be detected due to its own failure.Then, CVS18
Result is fed to μ COM19.
Similar to first embodiment, μ COM19 is executed at the detection of the detection processing of internal resistance and the both end voltage of secondary cell
Reason.Because the detection processing of internal resistance is similar to first embodiment, herein by description is omitted.
In the detection processing of the both end voltage of secondary cell, instead of reference voltage Vref, μ COM19 will be detected by CVS18
The both end voltage of secondary cell Ce1 to Ce3 be input to differential amplifier circuit 16 as reference voltage Vref.Now, will illustrate
The case where both end voltage of secondary cell Ce1 cannot be detected using CVS18 and be able to detect the both end voltage of secondary cell Ce2.μ
The e+ terminal of change-over switch SW+ is connected to a+ terminal by COM19, and the e- terminal of change-over switch SW- is connected to a- terminal, and
The c terminal of change-over switch SW1 is connected to a terminal.To which μ COM19 makes first capacitor device C1 keep secondary cell Ce1's
Both end voltage.
Then, the e+ terminal of change-over switch SW+ is connected to b+ terminal by μ COM19, and the e- terminal of change-over switch SW- is connected
It is connected to b- terminal, and the c terminal of change-over switch SW1 is connected to b terminal.To which μ COM19 protects the second capacitor C2
Hold the both end voltage of secondary cell Ce2.Then, the both end voltage of secondary cell Ce1, Ce2 are input to differential amplification electricity respectively
Road 16+input and-input.
In addition, μ COM19 obtains differential voltage Vm at this time to detect the both end voltage of secondary cell Ce1.Work as detailed description
When, with the differential voltage Vm of following formula (4) expression at this time.
Vm=(Vc1-Vc2) * Av (4)
Wherein Av is the gain of differential amplifier circuit 16.
Therefore, because known gain Av and voltage Vc2, so μ COM19 can determine secondary cell according to differential voltage Vm
The both end voltage Vc1 of Ce1.
Then, the secondary cell using secondary cell state detector 1 that the flow chart description of reference Fig. 4 is substantially described
Both end voltage detection processing process details.
By the way, the secondary cell of the voltage that cannot detect battery both ends by secondary cell Ce1 into Ce3 is described as two
Primary cell Cex, and the secondary cell of the voltage for being able to detect battery both ends by secondary cell Ce1 into Ce3 is referred to as secondary
Battery Ceo.
Firstly, a secondary cell Cex is connect by μ COM19 with first capacitor device C1, and first capacitor device C1 is protected
Hold the both end voltage (step S11) of secondary cell Cex.Then, μ COM19 is by a secondary cell Ceo and the second capacitor C2
Connection, and the second capacitor C2 is made to keep the both end voltage (step S11) of secondary cell Ceo.Thus respectively will be secondary
Input that the both end voltage of battery Cex, CEo are input to differential amplifier circuit 16+input and-.
Then, μ COM19 obtains the differential voltage Vm of differential amplifier circuit 16, and whether within a predetermined range to judge Vm,
That is, whether differential voltage Vm is equal to or more than second threshold Vthmin and is equal to or less than first threshold Vthmax (step
S12).If second threshold Vthmin≤differential voltage Vm≤first threshold Vthmax (being "Yes" in step S12), μ COM19
The both end voltage (step S13) of secondary cell Cex is determined according to differential voltage Vm.
Then, if μ COM19 determined the both end voltage (being "Yes" in step S14) of all secondary cell Cex,
Processing terminate.If μ COM19 does not determine the both end voltage (being "No" in step S14) of all secondary cell Cex, will not sentence
Fixed secondary cell Cex is connected to first capacitor device C1, and secondary cell Ceo is connected to the second capacitor C2 (step
S15), it then the processing returns to step S12.
In addition, if being unsatisfactory for second threshold Vthmin≤differential voltage Vm≤first threshold Vthmax and (being in step S12
"No"), then μ COM19 judges whether to have switched all secondary cell Ceo (step S16).(it is in step S16 if do not switched
"No"), then μ COM19 switches secondary cell Ceo to be input to differential amplifier circuit 16 (step S17), and then processing returns to arrive step
Rapid S12.To if there is multiple secondary cell Ceo, then when the both end voltage of secondary cell Ceo is relative to secondary cell Cex mistake
When big or too small, the secondary cell Ceo of differential amplifier circuit 16 to be input to can be switched.
In addition, if switching (being "Yes" in step S16), μ COM19 judges whether differential voltage Vm is greater than first threshold
Vthmax (step S18).If Vm > Vthmax (being "Yes" in step S18), μ COM19 judges the both ends of secondary cell Cex
Voltage is greater than the both end voltage of all secondary cell Ceo, and certain exceptions has occurred, and execute scheduled abnormality processing
(step S19) is then ended processing.
In addition, if Vm≤Vthmax (being "No" in step S18), μ COM19 judge the both ends electricity of secondary cell Cex
Pressure is less than the both end voltage of all secondary cell Ceo, and judges whether to have been carried out the step S21 (step being hereinafter described
S20).If being not carried out (being "No" in step S20), μ COM19 exchanges first capacitor device C1 and the second capacitor C2 (step
S21).That is, in step s 12, secondary cell Cex is connect by μ COM19 with the second capacitor C2, and by secondary cell Ceo with
The C1 connection of first capacitor device.To, the both end voltage of secondary cell Ceo be input to differential amplifier circuit 16+input, secondary electricity
The both end voltage of pond Cex be input to differential amplifier circuit 16-input.Then μ COM19 returns to step S12, and switches two
Primary cell Ceo is to be input to+input, until second threshold Vthmin≤differential voltage Vm≤first threshold Vthmax.
According to above-mentioned second embodiment, as reference voltage, input is electric by the both ends of the CVS18 secondary cell Ceo detected
Pressure.To not need the reference voltage source 8 that setting shows reference voltage, and can other than secondary cell Ce1 to Ce3
Cost of implementation reduces.
In addition, according to above-mentioned second embodiment, when having multiple secondary cell Ceo by CVS18 detection voltage, μ
COM19 can make the secondary cell Ceo of its differential voltage Vm within a predetermined range as reference voltage.Thus, it is possible to further
Improve the detection accuracy of the both end voltage of secondary cell Ce1 to Ce3.
By the way, according to above embodiments, when differential voltage Vm outside the predetermined range when, switch secondary cell Ceo.So
And the invention is not limited thereto.Switching is not necessary.
By the way, the present invention is not limited to the above embodiments.That is, the present invention can be the case where not departing from the scope of the present invention
It is lower by various modifications and implementation.
Claims (6)
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| JP2017199071A JP6640169B2 (en) | 2017-10-13 | 2017-10-13 | Secondary battery state detection device and secondary battery state detection method |
| JP2017-199071 | 2017-10-13 |
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Also Published As
| Publication number | Publication date |
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| JP2019074348A (en) | 2019-05-16 |
| CN109669144B (en) | 2023-05-16 |
| JP6640169B2 (en) | 2020-02-05 |
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