CN202084968U - Precharge circuit of power battery - Google Patents

Precharge circuit of power battery Download PDF

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Publication number
CN202084968U
CN202084968U CN201120208969XU CN201120208969U CN202084968U CN 202084968 U CN202084968 U CN 202084968U CN 201120208969X U CN201120208969X U CN 201120208969XU CN 201120208969 U CN201120208969 U CN 201120208969U CN 202084968 U CN202084968 U CN 202084968U
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China
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described
pre
channels
voltage
connected
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CN201120208969XU
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Chinese (zh)
Inventor
魏学哲
陈金干
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上海恒动汽车电池有限公司
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Priority to CN201120208969XU priority Critical patent/CN202084968U/en
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Publication of CN202084968U publication Critical patent/CN202084968U/en

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Abstract

The utility model discloses a precharge circuit of a power battery, which comprises an optical coupler for isolating high voltage, an MOS tube with N channels, a high power precharge resistor, a first divider resistor, a second divider resistor, a zener diode, and a voltage stabilizing capacitor, wherein the MOS tube with the N channels is used for controlling switch on and switch off, the collector of the optical coupler is connected to the drain of the MOS tube with the N channels through the first divider resistor and the high power precharge resistor, the emitting electrode of the optical coupler is connected to the grid of the MOS tube with the N channels, the emitting electrode of the optical coupler is connected with the source electrode of the MOS tube with the N channels through the second divider resistor, and the zener diode and the voltage stabilizing capacitor that are in series connection are connected between the collector of the optical coupler and the source electrode of the MOS tube with the N channels. The circuit is used for replacing a precharge relay, can be integrated into a battery management controller, has a simple structure and high reliability, and greatly lowers the cost.

Description

A kind of power accumulator pre-charge circuit

Technical field

The utility model belongs to the auto electronic control technology field, relates to power accumulator management system mesohigh pre-charge circuit.

Background technology

There is a jumbo electric capacity used for electric vehicle power accumulator rear end, in use if direct closed both positive and negative polarity relay, then transient high-current can occur,, therefore before closing relay, need the big electric capacity in rear end is carried out precharge to the damage that impacts of the components and parts in battery and the circuit.Traditional method is to adopt relay series connection power resistor to realize precharge, because the power accumulator electric pressure is than higher, pre-charge-relay need be selected the withstand voltage higher and type that can bear instantaneous at least 3~5A rush of current, and the drawback of this method is relay cost height, it is limited additionally to take the open and close times of space certain on the car and relay mechanical contact.

Summary of the invention

Because the problems referred to above that prior art exists, the purpose of this utility model are to propose a kind of power accumulator pre-charge circuit, to solve the problems referred to above that prior art exists.

For achieving the above object, the utility model can be solved by the following technical programs:

A kind of power accumulator pre-charge circuit, comprise the optocoupler (U1) that is used for isolated high-voltage, the N-channel MOS pipe (Q1) of control conducting and shutoff, high-power pre-charge resistance (R3), first divider resistance (R2) and second divider resistance (R4), Zener diode (D1), and electric capacity of voltage regulation (C2), the collector electrode of described optocoupler (U1) is connected to the drain electrode of described N-channel MOS pipe (Q1) by first divider resistance (R2) and described high-power pre-charge resistance (R3), the emitter of described optocoupler (U1) is connected to the grid of described N-channel MOS pipe (Q1), and this emitter and connect the source electrode of described N-channel MOS pipe by described second divider resistance; Described Zener diode (D1) that is in parallel and electric capacity of voltage regulation (C2) are connected between the source electrode of the collector electrode of described optocoupler (U1) and N-channel MOS pipe (Q1).

Owing to adopt above technical scheme, power accumulator pre-charge circuit of the present utility model links to each other with a single-chip microcomputer and control circuit, can realize pre-charge process by control negative pole relay, anodal relay and precharge control circuit according to the instruction of single-chip microcomputer, whole pre-charge circuit can be integrated in the battery management controller, the components and parts cost is well below the cost of relay, and reliability height, outside line simply are easy to realize.

Description of drawings

Fig. 1 is a schematic diagram of the present utility model;

Wherein U1 is common optocoupler, and its No. 2 pin Control are connected to single chip machine controlling circuit, and R2 is that first divider resistance, R4 are second divider resistance, and C2 is an electric capacity of voltage regulation, and D1 is a Zener diode, and Q1 is the N-channel MOS pipe, and R3 is high-power pre-charge resistance.2 of A, C are connected to A, C 2 points among Fig. 2 among Fig. 1.

Fig. 2 is the schematic diagram of whole pre-charge system;

Wherein 1 is power accumulator, the 2nd, pre-charge circuit, its internal circuit as shown in Figure 1, S1 is anodal relay, and S2 is the negative pole relay, the 3rd, and single-chip microcomputer and control circuit, by commands for controlling both positive and negative polarity relay and pre-charge circuit, C1 is the big electric capacity of load end, the 4th, and voltage collection circuit is gathered battery terminal voltage U ABAnd capacitor C 1 terminal voltage U CD, be used for the auxiliary judgment of pre-charge process.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:

Shown in Fig. 1-2, a kind of power accumulator pre-charge circuit of the present utility model, comprise and isolate optocoupler U1, the first divider resistance R2, the second divider resistance R4, voltage stabilizing and protection component C2 and D1, N-channel MOS pipe and high-power pre-charge resistance R3, the collector electrode of optocoupler U1 is connected to the drain electrode of N-channel MOS pipe Q1 by the first divider resistance R2 and high-power pre-charge resistance R3, the emitter of optocoupler U1 is connected to the grid of N-channel MOS pipe Q1, and this emitter also connects the source electrode of N-channel MOS pipe by second divider resistance; Zener diode D1 that is in parallel and electric capacity of voltage regulation C2 are connected between the source electrode of the collector electrode of optocoupler U1 and N-channel MOS pipe Q1.The control pin of this pre-charge circuit is controlled by single-chip microcomputer and control circuit 3.

Before precharge began, anodal relay S1 and negative pole relay S1 were in off-state, and capacitor C 1 terminal voltage is zero, and optocoupler is in off state in the pre-charge circuit.Whole precharge process can be divided into following four steps:

1. closed negative pole relay S2.

This moment, capacitor C 1 terminal voltage was 0V, B, C, 3 equipotentials of D, U AB=U ACBecause optocoupler is in off-state, voltage U ACAll be added on divider resistance R2 and the Zener diode D1.This moment, the D1 both end voltage equaled its puncture voltage U Z, electric current I Z=(U AC-U Z)/R2.R2 and D1 choose suitable resistance and puncture voltage when the parameter type selecting, when making battery total voltage UAB be added in R2 and D1 to go up, diode D1, optocoupler U1B, capacitor C 2 can both operate as normal and not breakdown getting final product.This moment, the R4 both end voltage was zero, and the N-channel MOS pipe is in off-state, does not have electric current to flow through on the pre-charge resistance.

2. the optocoupler in the closed pre-charge circuit.

This moment, 3,4 pins of optocoupler U1B were equipotential, and the R4 both end voltage equals U Z, metal-oxide-semiconductor Q1 conducting, power accumulator 1 gives capacitor C 1 charging by the R3 in the precharge loop, Q1, causes U CDRise U gradually ACDescend gradually.Work as U ACDrop to the U that satisfies condition AC* R4/ (R2+R4)=U ZAfter, R4 both end voltage U R4Equal U AC* R4/ (R2+R4).Work as U R4Drop to unlatching threshold value U less than metal-oxide-semiconductor Q1 GS (th)After, metal-oxide-semiconductor turn-offs, U ACNo longer descend, at this moment U AC_minValue be:

U AC_min=U GS(th)×(R2+R4)/R4

Can choose suitable parameters by giving resistance R 2 and R4 and metal-oxide-semiconductor Q1, make U AC_minSatisfy the condition that precharge finishes.

3. closed anodal relay S1.

As battery terminal voltage U ABWith the capacitance terminal voltage U CDDifference U ACLess than safety value, think that then pre-charge process finishes, this moment can closed anodal relay S1.Because battery terminal voltage and capacitance terminal voltage phase difference are little, this moment, closed anodal relay S1 did not have very big electric current.

4. the optocoupler in the disconnection pre-charge circuit.

For the 1 both end voltage U of capacitor C under the initial condition C1Be not 0 situation, behind the closed negative pole relay S2, U AC=U AB-U C1, because UAC<U AB, circuit equally can operate as normal, therefore can carry out pre-charge process according to four above-mentioned steps equally.

Example

The physical circuit parameter of this example in the application of reality is as follows:

Power accumulator 1 terminal voltage U AB=360V; Capacitor C 1 is 5600uF; Pre-charge resistance R3 resistance is 100 ohm, and power is 150 watts; Divider resistance R2 resistance is 470k ohm, and withstand voltage is 500V; Divider resistance R4 resistance is 100k; Zener diode D1 puncture voltage U Z=15V; Electric capacity of voltage regulation C2 value is 100uF, and withstand voltage is 50V; The metal-oxide-semiconductor model is STB11NK50Z, its U GS (th)=3.75V, V DS (max)=500V;

Behind the closed negative pole relay of step (1) S2, U AC=360V, the D1 both end voltage is 15V, and the R4 both end voltage is 0, and metal-oxide-semiconductor Q1 is in off state.

Behind the optocoupler in the closed pre-charge circuit of step (2), the R4 both end voltage equals 15V at the beginning, metal-oxide-semiconductor Q1 conducting, and storage battery 1 charges to C1 by pre-charge resistance R3, and in beginning in a flash, charging current is 3.6A.Along with capacitor C 1 voltage raises gradually, charging current reduces gradually, U ACVoltage reduces gradually, works as U ACAfter=the 85.5V, the R4 both end voltage equals U AC* R4/ (R2+R4) works as U ACAfter reducing to 21.375V, the R4 both end voltage equals 3.75V, and after this metal-oxide-semiconductor Q1 turn-offs, U ACVoltage no longer descends.

After the closed anodal relay of step (3), U AC=0, carry out step (4) then, disconnect the optocoupler in the pre-charge circuit.So far pre-charge process finishes.

Above-mentioned embodiment is exemplary, is to be the restriction that this patent is comprised scope in order better to make those skilled in the art can understand this patent, can not to be interpreted as; So long as according to spirit that this patent discloses done anyly be equal to change or modify, all fall into the scope that this patent comprises.

Claims (1)

1. power accumulator pre-charge circuit, it is characterized in that: comprise the optocoupler (U1) that is used for isolated high-voltage, the N-channel MOS pipe (Q1) of control conducting and shutoff, high-power pre-charge resistance (R3), first divider resistance (R2) and second divider resistance (R4), Zener diode (D1), and electric capacity of voltage regulation (C2), the collector electrode of described optocoupler (U1) is connected to the drain electrode of described N-channel MOS pipe (Q1) by first divider resistance (R2) and described high-power pre-charge resistance (R3), the emitter of described optocoupler (U1) is connected to the grid of described N-channel MOS pipe (Q1), and this emitter and connect the source electrode of described N-channel MOS pipe by described second divider resistance; Described Zener diode (D1) that is in parallel and electric capacity of voltage regulation (C2) are connected between the source electrode of the collector electrode of described optocoupler (U1) and N-channel MOS pipe (Q1).
CN201120208969XU 2011-06-20 2011-06-20 Precharge circuit of power battery CN202084968U (en)

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Application Number Priority Date Filing Date Title
CN201120208969XU CN202084968U (en) 2011-06-20 2011-06-20 Precharge circuit of power battery

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103368221A (en) * 2012-03-28 2013-10-23 株式会社日立制作所 Battery system
CN103441540A (en) * 2013-08-12 2013-12-11 西安睿诺新能源有限公司 Vehicle-mounted storage battery set charger circuit based on chopped waves
CN104868516A (en) * 2014-12-19 2015-08-26 北汽福田汽车股份有限公司 Battery pre-charging protection method and device
CN105353319A (en) * 2015-11-27 2016-02-24 郑州日产汽车有限公司 Electric automobile pre-charging completion state detection apparatus based on passive isolation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103368221A (en) * 2012-03-28 2013-10-23 株式会社日立制作所 Battery system
CN103441540A (en) * 2013-08-12 2013-12-11 西安睿诺新能源有限公司 Vehicle-mounted storage battery set charger circuit based on chopped waves
CN103441540B (en) * 2013-08-12 2018-08-21 西安睿诺新能源有限公司 A kind of onboard power storage battery group charger circuit based on copped wave
CN104868516A (en) * 2014-12-19 2015-08-26 北汽福田汽车股份有限公司 Battery pre-charging protection method and device
CN104868516B (en) * 2014-12-19 2018-01-19 北汽福田汽车股份有限公司 A kind of battery pre-charging guard method and device
CN105353319A (en) * 2015-11-27 2016-02-24 郑州日产汽车有限公司 Electric automobile pre-charging completion state detection apparatus based on passive isolation
CN105353319B (en) * 2015-11-27 2018-06-15 郑州日产汽车有限公司 Electric vehicle pre-charging completion status detection device based on passive isolation

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C14 Grant of patent or utility model
GR01 Patent grant
ASS Succession or assignment of patent right

Owner name: SHANGHAI H + D EV BATTERY CO., LTD.

Free format text: FORMER OWNER: SHANGHAI H + D EV BATTERY CO.,LTD.

Effective date: 20150529

C41 Transfer of patent application or patent right or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 201804 JIADING, SHANGHAI TO: 201805 JIADING, SHANGHAI

TR01 Transfer of patent right

Effective date of registration: 20150529

Address after: 201805 Jiading District, Anting Town Park Road, No. 799, No.

Patentee after: SHANGHAI H&D EV BATTERY CO., LTD.

Address before: 201804 Shanghai Jiading District Huangdu Town Road No. 805 spring

Patentee before: Shanghai H & D Ev Battery Co.,Ltd.

PE01 Entry into force of the registration of the contract for pledge of patent right
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Precharge circuit of power battery

Effective date of registration: 20190318

Granted publication date: 20111221

Pledgee: Jiangxi State-owned Venture Capital Management Co., Ltd.

Pledgor: Shanghai H&D New Energy Co., Ltd.

Registration number: 2019360000012