CN205610244U - Be used for battery management system balanced device and switch network circuit thereof - Google Patents

Abstract

The utility model relates to a be used for battery management system balanced device and switch network circuit thereof, switch over network circuit include with treat balanced group battery in every treats that the balanced change over switch of the corresponding initiative of balanced battery monomer is right, the balanced change over switch of every initiative is to including MOSFET pipe and the 2nd MOSFET pipe, on the drain electrode of MOSFET pipe was connected to the battery electrode, on the drain electrode of the 2nd MOSFET pipe was connected to public balanced generating line, the balanced change over switch of initiative that the drain electrode of MOSFET pipe was connected to on the monomer negative pole of strange digital circuit pond was right, and the drain electrode D of its the 2nd MOSFET pipe just is connected to on the balanced generating line negative pole, the balanced change over switch of initiative that the drain electrode of MOSFET pipe was connected to on the monomer negative pole of even digital circuit pond is right, and the drain electrode D of its the 2nd MOSFET pipe just is connected to on the balanced generating line positive pole. The utility model discloses outside increase not under the condition of device, general MOSFET switch circuit's realization mode has been simplified by a wide margin to can adopt general MOSFET change over switch to replace expensively and heavy solid -state switch or relay.

Description

A kind of for battery management system equalizer and handover network circuit thereof

Technical field

This utility model relates to battery management system, particularly to one for battery management system equalizer and Handover network circuit.

Background technology

The novel batteries such as lithium ion battery are when being used in series, after the discordance between battery cell can cause in groups Set of cells active volume diminish, when charging, the higher battery cell of voltage can cause charging process the most eventually Only, charging capacity diminishes；During electric discharge, the battery cell of low voltage can guiding discharge process terminate in advance, Discharge capacity reduces；In order to improve battery with two side terminals, current relatively effective method is to enter battery cell Row equilibrium, discharges monomer high for voltage, is charged the monomer that voltage is low, and Fig. 1 is the most feasible One of equalization scheme.

Battery equalization system is mainly made up of two parts: handover network circuit (abbreviation handover network) and equilibrium are filled Discharge module (abbreviation charge-discharge modules), during work, CPU controls handover network will need the battery list of equilibrium Body is switched to equalize on bus (BUS+, BUS-) balance charge/discharge module by equilibrium bus to this battery cell It is charged or discharges, to realize equalization function.Wherein in handover network circuit such as Fig. 2 in dashed box shown in, figure Middle BT1～BT12 is 12 joint battery to be balanced monomers, SW0～SW12 is switching switch, its work process As follows: assuming that first segment battery to be balanced monomer BT1 needs equilibrium, control SW0 and SW1 is closed by CPU Closing, SW2～12 disconnects, and now BT1 battery cell is just linked into equilibrium bus positive pole BUS+ and negative pole BUS- On, the balance charge/discharge module connected with Jun Heng bus just can be charged equilibrium to this monomer or electric discharge is equal Weighing apparatus.

In above-mentioned balancing control circuit, it is relatively costly that SW0～SW12 switching switchs, and general selection machinery continues Electrical equipment or semiconductor solid-state relay realize, especially in the occasion that euqalizing current is bigger, and the cost of switching switch Becoming geometrical progression to rise with electric current with voltage, additionally mechanical relay has bulky shortcoming, is unfavorable for that product is little Type.

On the other hand, in current battery management system, in addition to battery balanced function, just also has a critical function Being battery cell voltage acquisition function, voltage acquisition function can be realized by ripe special integrated acquisition chip, The MAX17830 of LTC6803, the MAXIM company of the BQ76PL536 of such as American TI Company, LINEAR company, The operation principle of the most special integrated voltage chips BQ76PL536, its exemplary operation circuit is as shown in Figure 3.

In Fig. 3, BQ76PL536 is except completing the voltage acquisition function of 6 batteries monomer CELL1～CELL6 Outward, it is also possible to realizing the passive type equalization discharge of 6 joint battery to be balanced monomers, balanced operation process is as follows: set CELL3 needs to carry out equalization discharge, and BQ76PL536 will control CB3 pin, and (MOSFET drives pin, quilt Dynamic balanced drive interface pin) output high level relative to BAT2, this high level will open MOSFET The unnecessary electric energy of pipe Q4, CELL3 will be consumed by power resistor RBAL4 resistance and MOSFET pipe Q4 short circuit Falling, it is achieved that discharge type passively equalizes, the Balance route the most exportable high level of pin CB1～CB6 of this chip drives Dynamic corresponding MOSFET conducting, thus the discharge type realizing each battery cell passively equalizes.But scheme cannot Realize rechargeable active equalization.

Utility model content

The purpose of this utility model is to provide one for battery management system equalizer and to switch net circuit, Rechargeable active equalization can be realized, and the general MOSFET switching switch of low can be used.

To this end, the utility model proposes includes balance charge/discharge module for battery management system equalizer, cuts Switching network circuit and handover network control circuit；Described balance charge/discharge module includes equalizing bus positive pole and equilibrium Bus negative pole；Described handover network circuit on one side is connected with described balance charge/discharge module, and the other end is with to be equalized Set of cells is connected；Described handover network control circuit is connected with handover network circuit, for controlling handover network Switching action；Described handover network circuit includes that battery to be balanced monomer each with battery to be balanced group is corresponding Active equalization switching switch right, each active equalization switching switch to include the oneth MOSFET pipe and second MOSFET manages, and the drain electrode of a described MOSFET pipe is connected on battery electrode, the 2nd MOSFET The drain electrode of pipe is connected on public equilibrium bus, and the drain electrode of a MOSFET pipe is connected to odd number battery cell Active equalization switching switch on negative pole is right, and the drain electrode of its 2nd MOSFET pipe connects to equalize bus and bears Extremely go up；The active equalization switching switch that the drain electrode of the oneth MOSFET pipe is connected on even number battery cell negative pole Right, the drain electrode of its 2nd MOSFET pipe connects to equalize on bus positive pole.

Preferably, of the present utility model can also have the feature that for battery management system equalizer

Also including that solid-state relay switchs, its one end is connected to battery to be balanced group positive pole, and the other end is connected to all Weighing apparatus bus negative pole；Also include external control circuit, individually control the turn-on and turn-off of described solid-state relay switch.

Described switching net control circuit includes the electricity that battery to be balanced monomer can realize passive type equalization discharge Pond monomer voltage acquisition chip, and peripheral circuit.

Described chip is one of following: BQ76PL536, LTC6803, MAX17830.

Each active equalization switching switch to the pole that controls be connected respectively to a MOSFET of described chip and drive Dynamic pin.

The source electrode of the oneth MOSFET pipe and the 2nd MOSFET pipe links together, and grid links together, Arranging a resistance between source electrode and grid, this resistance adjusts MOSFET pipe and the 2nd MOSFET Impedance between grid and the source electrode of pipe, makes to obtain stable level between grid and source electrode.

In described voltage acquisition chip, the conductor length of voltage acquisition line is less than simple passive type equalization discharge time institute The conductor length used, or the conductor cross-section used when sectional area of wire is more than simple passive type equalization discharge.

Described MOSFET is AO4892, and described solid-state relay is AQV252G.

Battery to be balanced amount of monomer included in described battery to be balanced group is 6 or 12.

This utility model also proposes a kind of handover network circuit for battery management system equalizer, including with treat The active equalization switching switch that in balancing battery group, each battery to be balanced monomer is corresponding is right, each active equalization Switching switchs including a MOSFET pipe and the 2nd MOSFET pipe, a described MOSFET pipe Drain electrode is connected on battery electrode, and the drain electrode of the 2nd MOSFET pipe is connected on public equilibrium bus, and first The active equalization switching switch that the drain electrode of MOSFET pipe is connected on odd number battery cell negative pole is right, and it is second years old The drain electrode of MOSFET pipe connects to equalize on bus negative pole；The drain electrode of the oneth MOSFET pipe is connected to idol Active equalization switching switch on number battery cell negative pole is right, and the drain electrode of its 2nd MOSFET pipe connects to On equilibrium bus positive pole.

The utility model has the advantage of, by the ingehious design to switch mosfet pipe circuit, do not increasing In the case of adding additional devices, significantly simplify the implementation of general MOSFET switching on-off circuit, from And used general MOSFET switching switch to replace costly and heavy solid-state switch or relay.

This utility model utilizes common passive balanced drive drives active equalization switching switch, it is adaptable to institute There is the battery voltage acquisition chip with passive balanced drive interface, technically have universality.

Accompanying drawing explanation

Fig. 1 is battery management system equalizer block diagram.

Fig. 2 is battery management system equalizer handover network circuit diagram figure.

Fig. 3 is the exemplary operation circuit diagram of special integrated voltage chips BQ76PL536.

Fig. 4 is this utility model embodiment circuit theory diagrams.

Fig. 5 is this utility model embodiment dashed rectangle enlarged schematic partial view.

Detailed description of the invention

Embodiment one

The present embodiment is by circuit design cleverly, it is possible to uses the chips such as BQ76PL536 to realize active equalization and cuts Changing the control of switch, its principle is as shown in Figure 4.

In Fig. 4, dotted line frame internal circuit is different from Fig. 3, add here 6 couples of MOSFET (respectively Q01A, Q01B～Q06A, Q06B), a solid-state relay switch K7, increase part as shown in Figure 5.Fig. 4, All BUS+ signals in Fig. 5 are received and are received balance charge/discharge module BUS+ port together, and all BUS believe Number receive and to receive balance charge/discharge module BUS port together.

As shown in Figure 4, all equalizer switches are formed (switch mosfet by two N-channel MOS FET It is right to manage, active equalization switching switch to), referred to as A pipe (MOSFET pipe) and B pipe (the 2nd MOSFET Pipe), the source S of A pipe and B pipe links together, and grid G links together, in source S and grid G Between a resistance is set, this resistance adjust G and S of A pipe and B pipe impedance, make between G and S Obtain stable level.The drain D of A pipe is connected on battery electrode, and the drain D of B pipe is connected to public On equilibrium bus, if the negative pole of the odd number monomer such as the drain D of the A pipe of equalizer switch and 1#, 3#, 5# is even Connect, then the drain D of the B pipe of this equalizer switch connects to equalize on bus negative pole BUS, if equilibrium is opened The negative pole of the even number monomers such as drain D and 2#, 4#, the 6# of the A pipe closed is connected, then the B of this equalizer switch The drain D of pipe connects to equalize on bus positive pole BUS+.

Its work process is as follows: setting CELL3 equally needs equilibrium, BQ76PL536 chip controls CB3 and CB4 Output high level, remaining CB port is off-state；After CB3 exports high level, Q03A and Q03B Can turn on, the negative pole of CELL3 is connected to BUS network by MOSFET；After CB4 output high level, Q04A and Q04B can turn on, and the positive pole of CELL3 is connected to BUS+ network by MOSFET；Now Start balance charge/discharge module by BUS+ and BUS port CELL3 battery cell be charged or discharge Equilibrium, the balance control method of CELL1～CELL5 is similar, CELL6 monomer balancing procedure topmost Different from other monomers, except needs BQ76PL536 chip controls CB6 output high level drive Q06A and Outside Q06B conducting, in addition it is also necessary to external control circuit individually controls relay K 7 and turns on, mono-to realize CELL6 Body is linked into the purpose in BUS+ and BUS discharge and recharge network, it is achieved charge and discharge balancing.

The present embodiment utilizes the inherent function interface of special integrated voltage chips, by chip integrated to specialized voltages The transformation of peripheral circuit, it is achieved that use 6 to the general MOSFET of low cost (respectively Q01A, Q01B, ～Q06A, Q06B) (generally mechanical relay or semiconductor solid-state continues to substitute 6 high cost switching switches Electrical equipment).Generally, what six groups of MOSFET switchings the most altogether switched is very difficult to drive, and the present embodiment utilizes The existing passive balanced drive interface of BQ76PL536 chip, in the case of not increasing additional devices, greatly Width simplifies the implementation of general MOSFET switching on-off circuit.

Be advantageously implemented miniaturization and the low cost of equalizer by foregoing circuit, above-mentioned MOSFET can select The AQV252G of PANASONIC can be selected with the AO4892 of AOS company, solid-state relay K7.

The circuit newly increased when carrying out charge and discharge balancing, due to active equalization electric current more original passively equalize electricity Stream big (active equalization 1～2A, passive equilibrium generally about 100mA), euqalizing current is at voltage acquisition line On pressure drop will be a greater impact to voltage acquisition precision, can use shortening conductor length or improve sectional area of wire Method reduce line impedance, flow through the battery voltage acquisition error caused to reduce due to euqalizing current.

Special integrated voltage acquisition chip BQ76PL536 in Fig. 4, could alternatively be other similar chips, Such as the LTC6803 of LINEAR company, the MAX17830 of MAXIM company；After changing chip, circuit is opened up Flutter and battery strings number meeting respective change, as 6 strings become 12 strings.

The foregoing is only embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model, Every equivalent device utilizing this utility model description and accompanying drawing content to be made or equivalent method conversion, or directly Or indirectly it is used in other relevant technical fields, the most in like manner it is included in scope of patent protection of the present utility model.

Claims (10)

1. for a battery management system equalizer, including balance charge/discharge module, handover network circuit and handover network control circuit；Described balance charge/discharge module includes equalizing bus positive pole and equilibrium bus negative pole；Described handover network circuit on one side is connected with described balance charge/discharge module, and the other end is connected with battery to be balanced group；Described handover network control circuit is connected with handover network circuit, for controlling the switching action of handover network；It is characterized in that: described handover network circuit include battery to be balanced monomer each with battery to be balanced group corresponding active equalization switching switch right, each active equalization switching switch is to including a MOSFET pipe and the 2nd MOSFET pipe, the drain electrode of a described MOSFET pipe is connected on battery electrode, the drain electrode of the 2nd MOSFET pipe is connected on public equilibrium bus, the active equalization switching switch that the drain electrode of the oneth MOSFET pipe is connected on odd number battery cell negative pole is right, and the drain electrode of its 2nd MOSFET pipe connects to equalize on bus negative pole；The active equalization switching switch that the drain electrode of the oneth MOSFET pipe is connected on even number battery cell negative pole is right, and the drain electrode of its 2nd MOSFET pipe connects to equalize on bus positive pole.

2. as claimed in claim 1 for battery management system equalizer, it is characterised in that: also including that solid-state relay switchs, its one end is connected to battery to be balanced group positive pole, and the other end is connected to equalize bus negative pole；Also include external control circuit, individually control the turn-on and turn-off of described solid-state relay switch.

3. as claimed in claim 1 for battery management system equalizer, it is characterised in that: described switching net control circuit includes the battery cell voltage acquisition chip that battery to be balanced monomer can realize passive type equalization discharge, and peripheral circuit.

4. as claimed in claim 3 for battery management system equalizer, it is characterised in that: described chip is one of following: BQ76PL536, LTC6803, MAX17830.

5. as claimed in claim 4 for battery management system equalizer, it is characterised in that: each active equalization switching switch to the pole that controls be connected respectively to a MOSFET of described chip and drive pin.

6. as claimed in claim 1 for battery management system equalizer, it is characterized in that: the source electrode of a MOSFET pipe and the 2nd MOSFET pipe links together, grid links together, one resistance is set between source electrode and grid, this resistance adjusts the impedance between a MOSFET pipe and grid and the source electrode of the 2nd MOSFET pipe, makes to obtain stable level between grid and source electrode.

7. as claimed in claim 5 for battery management system equalizer, it is characterized in that: the conductor length that in described voltage acquisition chip, the conductor length of voltage acquisition line is used when being less than simple passive type equalization discharge, or the conductor cross-section used when sectional area of wire is more than simple passive type equalization discharge.

8. as claimed in claim 2 for battery management system equalizer, it is characterized in that: described MOSFET is AO4892, described solid-state relay is AQV252G.

9. as claimed in claim 1 for battery management system equalizer, it is characterized in that: battery to be balanced amount of monomer included in described battery to be balanced group is 6 or 12.

10. the handover network circuit for battery management system equalizer, it is characterized in that: include battery to be balanced monomer each with battery to be balanced group corresponding active equalization switching switch right, each active equalization switching switch is to including a MOSFET pipe and the 2nd MOSFET pipe, the drain electrode of a described MOSFET pipe is connected on battery electrode, the drain electrode of the 2nd MOSFET pipe is connected on public equilibrium bus, the active equalization switching switch that the drain electrode of the oneth MOSFET pipe is connected on odd number battery cell negative pole is right, the drain electrode of its 2nd MOSFET pipe connects to equalize on bus negative pole；The active equalization switching switch that the drain electrode of the oneth MOSFET pipe is connected on even number battery cell negative pole is right, and the drain electrode of its 2nd MOSFET pipe connects to equalize on bus positive pole.