CN202975278U

CN202975278U - Storage battery voltage detection device

Info

Publication number: CN202975278U
Application number: CN 201220585357
Authority: CN
Inventors: 杨永平; 杨春稳; 李志雨; 魏圆圆
Original assignee: TANGSHAN KAILUAN HUAMING ELECTRICAL APPLIANCE CO Ltd
Current assignee: TANGSHAN KAILUAN HUAMING ELECTRICAL APPLIANCE CO Ltd
Priority date: 2012-11-08
Filing date: 2012-11-08
Publication date: 2013-06-05
Anticipated expiration: 2022-11-08

Abstract

A storage battery voltage detection device belongs to the technical field of voltage detecting instruments and is used for real-time detection of lithium battery pack's charge-discharge battery cell voltage. The technical scheme is as follows: the detection device comprises a voltage detection chip, external balanced circuits, an input voltage protection circuit and a magnetic isolator. A plurality of input ports of the voltage detection chip form a plurality of data channels through peripheral circuits respectively. Two adjacent data channels form a detection loop for acquiring battery cell voltage. Each detection loop is connected to an external balanced circuit. The input voltage protection circuit is connected with one input port of the voltage detection chip. Two output ports of the voltage detection chip are connected to a singlechip through the magnetic isolator. According to the utility model, terminal voltage, charge-discharge current and voltage of multiple cells in the lithium battery pack can be acquired at real time, and acquired data reaches up to 12-bit precision. The storage battery voltage detection device provided by the utility model operates reliably, has strong antijamming capability, and can be used to effectively protect the measurement chip and prevent cells from overcharge or overdischarge.

Description

A kind of accumulator battery voltage pick-up unit

Technical field

The utility model relates to a kind of lithium battery group and discharges and recharges the monomer battery voltage real-time detection apparatus, belongs to the voltage testing instrument technical field.

Background technology

Lithium battery is main power source or the standby power supply of a lot of equipment, if will cause inside battery generation chemical side reactions to over-charge of lithium battery electricity, overdischarge, this subsidiary reaction meeting has a strong impact on performance and the serviceable life of battery, the safety problem such as even will set off an explosion, therefore need one to be used for the charge and discharge state of battery is carried out the effectively device of detection in real work, prevent from battery self is caused damage.Discharged in series is accumulator using method commonly used; because the overall performance of series battery depends on the poorest cell of electric battery performance; the voltage status of only having cell in real-time detection series battery; just can accomplish cell is effectively protected; and extending its serviceable life, the voltage that therefore accurately detects each batteries is very important.

Serial lithium battery group voltage detection method mainly contains resistance sampling method and two kinds of methods of differential amplifier detection method at present.These two kinds of methods all can cause unbalanced between each batteries, finally affect the life-span of electric battery.

The utility model content

Technical problem to be solved in the utility model is to provide a kind of accumulator battery voltage pick-up unit, and this device can accurately gather each cell charging/discharging voltage in series-connected batteries, detects.

The technical scheme that solves the problems of the technologies described above is:

a kind of accumulator battery voltage pick-up unit, its formation comprises voltage checking chip U1, outer balancing circuitry, input voltage protection circuit, magnetic isolator U2, a plurality of input ports of voltage checking chip U1 form a plurality of data channel by peripheral circuit respectively, the adjacent two data passage forms a detection loop that gathers monomer battery voltage, outer balancing circuitry of detection loop connection that the adjacent two data passage forms, input voltage protection circuit is connected with the input port of voltage checking chip U1, two output ports of voltage checking chip U1 are connected with the input end of clock mouth with the data-in port of single-chip microcomputer by magnetic isolator U2.

above-mentioned accumulator battery voltage pick-up unit, the outer balancing circuitry structure that described a plurality of data channel connects is identical, one of them outer balancing circuitry is by field effect transistor T1, LED 1, resistance R 22, R23, R24 forms, after 1 series connection of resistance R 23 and LED and resistance R 22 and being connected between the drain electrode and data passage of voltage checking chip U1 of field effect transistor T1, the source electrode of field effect transistor T1 is connected with adjacent data channel, resistance R 24 is connected on battery CELL detected between the grid of field effect transistor and source electrode and is connected between two data passages.

Above-mentioned accumulator battery voltage pick-up unit; described input voltage protection circuit is comprised of diode D4, voltage stabilizing diode VD5, capacitor C 13, resistance R 17, R18, R19; the positive pole of diode D4 connects the data passage of voltage checking chip U1 by resistance R 17; the negative pole of diode D4 is by electric capacity 13 ground connection; be connected on the negative pole of voltage stabilizing diode VD5 after resistance R 18, R19 series connection, the plus earth of voltage stabilizing diode VD5.

Above-mentioned accumulator battery voltage pick-up unit, the SCLL port of described voltage checking chip U1 and SDAL port connect SCL2 port and the SDA2 port of magnetic isolator U2, and the SCL1 port of magnetic isolator U2 is connected with the SDA port with the SCL port of single-chip microcomputer with the SDA1 port.

The beneficial effects of the utility model are:

1. the utility model is in the charging and discharging lithium battery process, can Real-time Collection lithium battery group in nearly terminal voltage, charging and discharging currents and the voltage of 12 batteries, and image data prevents that up to 12 precision battery from overcharging or the overdischarge phenomenon;

2. the utility model utilizes the magnetic isolator, has effectively suppressed on-the-spot interference, has realized the coupling of level and the isolation of power supply;

3. external balance circuit connecting inner cell switch of the present utility model protection chip effectively.

Description of drawings

Fig. 1 is electric functional-block diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model;

Fig. 3 is an outer balancing circuitry schematic diagram of the present utility model.

In figure, mark is as follows: voltage checking chip U1, magnetic isolator U2, field effect transistor T1, diode D1-D4, LED 1, voltage stabilizing diode VD1-VD5, resistance R 1-R24, capacitor C 0-C20, outer balancing circuitry W1-W12.

Embodiment

The utility model adopts voltage checking chip U1 in conjunction with single-chip microcomputer, cell voltage to be detected.There are a plurality of peripheral circuits to connect electric capacity, resistance at voltage checking chip U1, a peripheral circuit output connects the voltage data of single-chip microcomputer the corresponding interface storage of collected, the data channel that all the other peripheral circuits form is connected to cell through identical external balance circuit respectively again, carries out multichannel voltage collection and balanced discharge.Two output ports of voltage checking chip U1 are connected with the input end of clock mouth with the data-in port of single-chip microcomputer by magnetic isolator U2.

Show in figure; an embodiment of the present utility model adopts the MAX11068 chip as voltage checking chip U1; 13 input port P0 of MAX11068 chip-P12 connects peripheral circuit and forms 13 data passage E1-E13; difference connecting resistance R1-R13, capacitor C 0-C12; resistance plays dividing potential drop, metering function, prevent the internal switch plumber as the time to bear voltage too large, the protection chip; electric capacity plays the inside and outside switch tube voltage effect of balance, guarantees accurate image data.

Show in figure, 13 data passages of MAX11068 chip, one group of 12 of composition in twos detect the loop, can detect 12 batteries, form one as E13, E12 and detect the loop, E12, E11 form one and detect the loop, E11, E10 form one and detect the loop ..., E2, E1 form one and detect the loop.12 are detected the loop and meet respectively 12 outer balancing circuitry W1-W12, and their structure is identical.Balancing circuitry W12 is example in addition, it is comprised of field effect transistor T1, LED 1, resistance R 22, R23, R24, after 1 series connection of resistance R 23 and LED and resistance R 22 and being connected between the drain electrode and data passage of voltage checking chip U1 of field effect transistor T1, the source electrode of field effect transistor T1 is connected with adjacent data channel, resistance R 24 is connected between the grid and source electrode of field effect transistor, and detected battery CELL is connected between data channel E2, E1.Wherein field effect transistor T1 plays on-off action, makes R22 have electric current to pass through, and electric weight is bled off by resistance R 22.Light emitting diode LED1 plays indicative function, and resistance R 23 is divider resistance, and R24 is the protective resistance of field effect transistor T1.

Show in figure; input voltage protection circuit is comprised of diode D4, voltage stabilizing diode VD5, capacitor C 13, resistance R 17, R18, R19; the positive pole of diode D4 connects the data passage of voltage checking chip U1 by resistance R 17; the negative pole of diode D4 is by electric capacity 13 ground connection; be connected on the negative pole of voltage stabilizing diode VD5 after resistance R 18, R19 series connection, the plus earth of voltage stabilizing diode VD5.Wherein capacitor C 13 is decoupling capacitor, and diode D4 prevents that capacitor C 13 discharges from causing that electric current is reverse, and resistance R 17, R18, R19 are divider resistance.

Show in figure, with 15 pin SCLL of MAX11068 chip with are connected pin SDAL and are connected after magnetic isolator U2 isolation with the SDA pin with the SCL of single-chip microcomputer C8051F340, the model of magnetic isolator U2 is ADuM1250.SCL and SDA are respectively clock line and data line, and the data that are collected are reached single-chip microcomputer and storage.

6 to 12 pins in the MAX11068 chip, 17 pins, 19 to 21 pins are vacant.The chip 2 pin CP+ HV of place are connected with the 38 pin HV of place, and the chip 37 pin C12 SHDN of place are connected with the 18 pin SHDN of place.

After the peripheral circuit of MAX11068 chip was connected, the MAX11068 chip was given after electricity by this chip of software initialization, and can Real-time Collection respective battery voltage and reach single-chip microcomputer by software control.The MAX11068 chip adopts the rescan framework gather battery data and they are carried out error correction.The phase one of scanning is data acquisition, and the voltage of all 12 batteries is sampled; Subordinate phase is error correction, and copped wave is carried out in input to ADC, eliminates error.

The MAX11068 chip that the utility model adopts is a able to programme, high integration, high pressure, 12 passages, battery detection intelligent data acquisition interface, can carry out charge and discharge balancing detection, cell safety protection, battery failures diagnosis etc.Highly integrated battery detector combines simple and direct state machine and High Speed I 2C bus, supports the communication of SMBus serial link.

The MAX11068 chip has greatly been simplified the design of multiple batteries group, guarantees to meet simultaneously the AEC-Q100 standard in wider operating temperature range, keeps height reliability.The MAX11068 chip adopts the two-phase scanning technique, obtain battery measurement data and round-off error, this technology can be measured cell voltage simultaneously, completes the voltage measurement samples of whole 120 batteries in 10 μ s, even also can guarantee excellent precision in noisy electromagnetic system.

Claims

1. accumulator battery voltage pick-up unit, it is characterized in that: its formation comprises voltage checking chip U1, outer balancing circuitry, input voltage protection circuit, magnetic isolator U2, a plurality of input ports of voltage checking chip U1 form a plurality of data channel by peripheral circuit respectively, the adjacent two data passage forms a detection loop that gathers monomer battery voltage, outer balancing circuitry of detection loop connection that the adjacent two data passage forms, input voltage protection circuit is connected with the input port of voltage checking chip U1, two output ports of voltage checking chip U1 are connected with the input end of clock mouth with the data-in port of single-chip microcomputer by magnetic isolator U2.

2. accumulator battery voltage pick-up unit according to claim 1, it is characterized in that: the outer balancing circuitry structure that described a plurality of data channel connect is identical, one of them outer balancing circuitry is by field effect transistor T1, LED 1, resistance R 22, R23, R24 forms, after 1 series connection of resistance R 23 and LED and resistance R 22 and being connected between the drain electrode and data passage of voltage checking chip U1 of field effect transistor T1, the source electrode of field effect transistor T1 is connected with adjacent data channel, resistance R 24 is connected between the grid and source electrode of field effect transistor, detected battery CELL is connected between two data passages.

3. accumulator battery voltage pick-up unit according to claim 2; it is characterized in that: described input voltage protection circuit is comprised of diode D4, voltage stabilizing diode VD5, capacitor C 13, resistance R 17, R18, R19; the positive pole of diode D4 connects the data passage of voltage checking chip U1 by resistance R 17; the negative pole of diode D4 is by electric capacity 13 ground connection; be connected on the negative pole of voltage stabilizing diode VD5 after resistance R 18, R19 series connection, the plus earth of voltage stabilizing diode VD5.

4. accumulator battery voltage pick-up unit according to claim 3, it is characterized in that: the SCLL port of described voltage checking chip U1 and SDAL port connect SCL2 port and the SDA2 port of magnetic isolator U2, and the SCL1 port of magnetic isolator U2 is connected with the SDA port with the SCL port of single-chip microcomputer with the SDA1 port.