CN114844175A - Multi-battery management chip system - Google Patents
Multi-battery management chip system Download PDFInfo
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- CN114844175A CN114844175A CN202210646498.3A CN202210646498A CN114844175A CN 114844175 A CN114844175 A CN 114844175A CN 202210646498 A CN202210646498 A CN 202210646498A CN 114844175 A CN114844175 A CN 114844175A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/14—Preventing excessive discharging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a multi-battery management chip system, which belongs to the field of battery protection and comprises a delay circuit, a logic circuit module, an OSC module, an overcharge/overdischarge signal processing module, a disconnection signal processing module, a CO drive module, a DO drive module, a load/charger detection module, a charging overcurrent/discharging overcurrent detection module, a charging overtemperature/discharging overtemperature detection module, a discharging overcurrent external delay module, a battery voltage detection module and a battery disconnection detection module; the system comprises an OSC module, an overcharge/overdischarge signal processing module, a disconnection signal processing module, a CO drive, a DO drive, a load/charger detection module, a charging overcurrent/discharging overcurrent detection module, a charging overtemperature/discharging overtemperature detection module and a discharging overcurrent external delay module, wherein the OSC module, the overcharge/overdischarge signal processing module, the disconnection signal processing module, the CO drive, the DO drive, the load/charger detection module, the charging overcurrent/discharging overcurrent detection module, the charging overtemperature/discharging overtemperature detection module and the discharging overcurrent external delay module are all connected with a delay circuit and a logic circuit module; the battery voltage detection module and the battery disconnection detection module are respectively connected with the overcharge overdischarge signal processing module and the disconnection signal processing module.
Description
Technical Field
The invention relates to the technical field of battery protection, in particular to a multi-battery management chip system.
Background
The energy crisis is getting more serious, and batteries become one of the most promising alternative energy sources for hybrid electric vehicles and electric vehicles. At present, the battery management system has wide application, is easy to manage and control the internal data state of the battery, and the technology related to the battery management in the prior art has the following defects:
(1) when the chip designs the battery voltage detection, the traditional battery voltage detection adopts a resistance voltage division sampling principle, and the sampling precision is not high;
(2) when the lithium battery is charged or discharged in a working state, the battery pack can generate heat, and when the heat of the battery is too high, the safety problem can occur, and the service life of the battery can be influenced when the lithium battery works at a high temperature for a long time;
(3) charging overcurrent or discharging overcurrent easily reduces the life of the battery.
Disclosure of Invention
The present invention is directed to a multi-battery management chip system to solve the problems of the background art.
In order to solve the above technical problem, the present invention provides a multi-battery management chip system, including:
the OSC module, the overcharge/overdischarge signal processing module, the disconnection signal processing module, the CO drive, the DO drive, the load/charger detection module, the charging overcurrent/discharging overcurrent detection module, the charging overtemperature/discharging overtemperature detection module and the discharging overcurrent external delay module are all connected with the delay circuit and the logic circuit module;
the battery voltage detection module and the battery disconnection detection module are respectively connected with the overcharge overdischarge signal processing module and the disconnection signal processing module;
the battery voltage detection module and the battery disconnection detection module are respectively connected with VD1 ports to VD5 ports; the CO drive and the DO drive are respectively connected with a CO port and a DO port; the load/charger detection module is connected with a VM port; the charging overcurrent/discharging overcurrent detection module is connected with the VINI port; the charging over-temperature/discharging over-temperature detection module is connected with the RTD port and the RTC port; the discharging overcurrent external delay module is connected with the TOC port.
In one embodiment, the battery voltage detection module includes a capacitor V _ CAP, a switch S10-S17, capacitors C11-C14, and a comparator CMP;
two ends of the capacitor V _ CAP are respectively connected with a switch S13 and a switch S14, one end of a capacitor C11 is connected with the switch S13, and the other end is connected with a capacitor C13 and a switch S17 in series and is connected with a reference voltage VREF; one end of the capacitor C12 is connected with the switch S14, the other end is connected with the capacitor C14 in series, and the starting S16 is grounded;
the positive input terminal of the comparator CMP is connected between the capacitor C12 and the capacitor C14, and the negative input terminal is connected between the capacitor C11 and the capacitor C13;
the capacitor C13 and the switch S17 are grounded through the start S10, the positive input terminal of the comparator CMP is grounded through the switch S11, and the negative input terminal of the comparator CMP is grounded through the switch S12.
In one embodiment, the battery disconnection detection module comprises five comparators, and positive input ends of the five comparators are respectively connected with a VD1 port, a VD2 port, a VD3 port, a VD4 port and a VD5 port; the negative input end is respectively connected with GND, VD1 port, VD2 port, VD3 port and VD4 port; the output ends of the five comparators are all connected to the disconnection signal processing module.
In one embodiment, the charging/discharging overtemperature detection module comprises switches S21-S23, resistors R1-R4, a switch SC1, a switch SD1, a switch SC2, a switch SD2, an external resistor and a comparator;
the switch S21 is sequentially connected in series with the resistor R4, the resistor R3, the resistor R2 and the resistor R1 and then grounded;
the external resistor comprises an RTC resistor, an RTD resistor and an NTC resistor, the switch SC1 is connected with the RTC resistor in series and then grounded through the NTC resistor, and the switch SD1 is connected with the RTD resistor in series and then grounded through the NTC resistor;
the positive input end of the comparator is connected between the resistor R3 and the resistor R2 through the switch S22, and the positive input end is connected between the resistor R2 and the resistor R1 through the switch S23; the negative input of the comparator is connected between the switch SC1 and the RTC resistor through the switch SD2, while the negative input is connected between the switch SD1 and the RTD resistor through the switch SC 2.
In one embodiment, the CO driver includes a PMOS drive output, an NMOS drive output, and an inverter; the inverter is connected with the input end of the PMOS drive output port, and the PMOS drive output port and the NMOS drive output port are respectively connected with the CO port through a switch.
In one embodiment, the multiple battery management chip system further comprises a 5V internal power supply and a 12V internal power supply; the 5V internal power supply is simultaneously connected with the battery voltage detection module, the OSC module, the delay circuit and logic circuit module and the 12V internal power supply; the 12V internal power supply is simultaneously connected to the 5V internal power supply and the CO and DO drivers.
The invention provides a multi-battery management chip system, which comprises a delay circuit, a logic circuit module, an OSC module, an overcharge/overdischarge signal processing module, a disconnection signal processing module, a CO drive, a DO drive, a load/charger detection module, a charging overcurrent/discharging overcurrent detection module, a charging overtemperature/discharging overtemperature detection module, a discharging overcurrent external delay module, a battery voltage detection module and a battery disconnection detection module, wherein the delay circuit, the logic circuit module, the OSC module, the overcharge/overdischarge signal processing module, the disconnection signal processing module, the CO drive, the DO drive, the load/charger detection module, the charging overcurrent/discharging overcurrent detection module, the charging overtemperature detection module, the discharging overcurrent external delay module, the battery voltage detection module and the battery disconnection detection module are arranged in a serial communication way; the system comprises an OSC module, an overcharge/overdischarge signal processing module, a disconnection signal processing module, a CO drive, a DO drive, a load/charger detection module, a charging overcurrent/discharging overcurrent detection module, a charging overtemperature/discharging overtemperature detection module and a discharging overcurrent external delay module, wherein the OSC module, the overcharge/overdischarge signal processing module, the disconnection signal processing module, the CO drive, the DO drive, the load/charger detection module, the charging overcurrent/discharging overcurrent detection module, the charging overtemperature/discharging overtemperature detection module and the discharging overcurrent external delay module are all connected with a delay circuit and a logic circuit module; the battery voltage detection module and the battery disconnection detection module are respectively connected with the overcharge overdischarge signal processing module and the disconnection signal processing module. According to the invention, through a battery voltage detection technology, the detection precision of a product is improved, and the power consumption of a chip is reduced; the charging over-temperature/discharging over-temperature detection module can detect the environmental temperature change of the battery in real time; the CO driving has 2 driving modes, so that the compatibility and the wide application of the chip are improved; the chip is designed with various battery protection detection functions, so that the safety of the battery is better protected, and the service life of the battery is prolonged.
Drawings
FIG. 1 is a system architecture diagram of a multi-battery management chip according to the present invention;
FIG. 2 is a schematic diagram of a battery voltage detection module;
FIG. 3 is a schematic diagram of a battery disconnection detection module;
FIG. 4 is a schematic structural diagram of a charging over-temperature/discharging over-temperature detection module;
fig. 5 is a charge over-temperature/discharge over-temperature detection waveform diagram;
FIG. 6 is a schematic diagram of a CO driving configuration;
FIG. 7 is a schematic diagram of a charge-discharge gate-in-gate NMOS charge-NMOS discharge system;
FIG. 8 is a schematic diagram of a charge-discharge cross-port and NMOS charge-NMOS discharge system;
FIG. 9 is a schematic diagram of a PMOS charge NMOS discharge system with different charge/discharge ports.
Detailed Description
A multi-battery management chip system according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The invention provides a multi-battery management chip system, the architecture of which is shown in figure 1, and the system comprises a delay circuit and logic circuit module, an OSC module, an overcharge/overdischarge signal processing module, a disconnection signal processing module, a CO drive, a DO drive, a load/charger detection module, a charging overcurrent/discharging overcurrent detection module, a charging overtemperature/discharging overtemperature detection module, a discharging overcurrent external delay module, a battery voltage detection module and a battery disconnection detection module; the system comprises an OSC module, an overcharge/overdischarge signal processing module, a disconnection signal processing module, a CO drive, a DO drive, a load/charger detection module, a charging overcurrent/discharging overcurrent detection module, a charging overtemperature/discharging overtemperature detection module and a discharging overcurrent external delay module, wherein the OSC module, the overcharge/overdischarge signal processing module, the disconnection signal processing module, the CO drive, the DO drive, the load/charger detection module, the charging overcurrent/discharging overcurrent detection module, the charging overtemperature/discharging overtemperature detection module and the discharging overcurrent external delay module are all connected with a delay circuit and a logic circuit module; the battery voltage detection module and the battery disconnection detection module are respectively connected with the overcharge overdischarge signal processing module and the disconnection signal processing module; the battery voltage detection module and the battery disconnection detection module are respectively connected with VD1 ports to VD5 ports; the CO drive and the DO drive are respectively connected with a CO port and a DO port; the load/charger detection module is connected with a VM port; the charging overcurrent/discharging overcurrent detection module is connected with the VINI port; the charging over-temperature/discharging over-temperature detection module is connected with the RTD port and the RTC port; the discharging overcurrent external delay module is connected with the TOC port. The multi-battery management chip system also comprises a 5V internal power supply and a 12V internal power supply; the 5V internal power supply is simultaneously connected with the battery voltage detection module, the OSC module, the delay circuit and logic circuit module and the 12V internal power supply; the 12V internal power supply is simultaneously connected to the 5V internal power supply and the CO and DO drivers.
As shown in fig. 2, the battery voltage detection module includes a capacitor V _ CAP, a switch S10 to a switch S17, capacitors C11 to C14, and a comparator CMP; two ends of the capacitor V _ CAP are respectively connected with a switch S13 and a switch S14, one end of a capacitor C11 is connected with the switch S13, and the other end is connected with a capacitor C13 and a switch S17 in series and is connected with a reference voltage VREF; one end of the capacitor C12 is connected with the switch S14, the other end is connected with the capacitor C14 in series, and the starting S16 is grounded; the positive input terminal of the comparator CMP is connected between the capacitor C12 and the capacitor C14, and the negative input terminal is connected between the capacitor C11 and the capacitor C13; the capacitor C13 and the switch S17 are grounded through the start S10, the positive input terminal of the comparator CMP is grounded through the switch S11, and the negative input terminal of the comparator CMP is grounded through the switch S12. The detection principle is as follows:
first, the capacitance and capacitance reactance formula needs to be known
The capacitive reactance is inversely proportional to the capacitance, and the larger the capacitance is, the smaller the capacitive reactance is; defining the known quantity: c11 ═ C12, C13 ═ C14, n ═ C11 ═ C13, that is, Xc11 ═ Xc12, Xc13 ═ Xc14, Xc11 ═ Xc12 ═ n ═ Xc13 ═ n ═ Xc14, GND is the reference point, and is equal to 0V.
In the initial state, C11 ═ C12 ═ S13 and VD1, S14 and GND are connected, switches S10, S11 and S12 are all closed, S15, S16 and S17 are all opened, the time delay is about 10us, the switches S10, S11 and S12 are opened by control signals, and S15, S16 and S17 are closed at the same time, so that 2 alternating current discharge paths are generated:
passage 1: from VD1 → S13 → V11 → S15 → V12 → C12 → C14 → GND, the voltage at the positive input terminal V + of the comparator CMP is obtained by dividing the voltage by the series capacitor (see the above capacitive reactance formula):
passage 2: from VREF → C13 → C11 → V11 → S13 → VD1, it is known that the V-upper voltage is obtained by dividing the voltage by the series capacitor:
according to operational amplifier, V + -V-is obtained:
since GND is 0V, VREF minus GND takes VREF directly, substituting a design definition known quantity yields:
when n is equal to 2, the total content of the N,
thus, the voltage between VD1-GND can be obtained;
and the sampling is sequentially and alternately carried out, so that the voltage of each battery can be accurately sampled, and the overcharge and overdischarge detection protection is tested.
The battery disconnection detection module samples the voltage of each battery through the operational amplifier, obtains a battery disconnection signal through the operational amplifier after a certain battery is abnormally disconnected, and generates a disconnection protection action, and the structure of the battery disconnection detection module is shown in fig. 3, and the battery disconnection detection module comprises five comparators, wherein positive input ends of the five comparators are respectively connected with a VD1 port, a VD2 port, a VD3 port, a VD4 port and a VD5 port; the negative input end is respectively connected with GND, VD1 port, VD2 port, VD3 port and VD4 port; the output ends of the five comparators are all connected to the disconnection signal processing module.
The charging over-temperature/discharging over-temperature detection module comprises switches S21-S23, resistors R1-R4, a switch SC1, a switch SD1, a switch SC2, a switch SD2, an external resistor and a comparator; the switch S21 is sequentially connected in series with the resistor R4, the resistor R3, the resistor R2 and the resistor R1 and then grounded; the external resistor comprises an RTC resistor, an RTD resistor and an NTC resistor, the NTC resistor is arranged on the battery pack and used for detecting the ambient temperature of the battery pack in real time, and the NTC resistor characteristic is increased along with the temperature; the switch SC1 is connected with the RTC resistor in series and then is grounded through the NTC resistor, and the switch SD1 is connected with the RTD resistor in series and then is grounded through the NTC resistor; the positive input end of the comparator is connected between the resistor R3 and the resistor R2 through the switch S22, and the positive input end is connected between the resistor R2 and the resistor R1 through the switch S23; the negative input of the comparator is connected between the switch SC1 and the RTC resistor through the switch SD2, while the negative input is connected between the switch SD1 and the RTD resistor through the switch SC 2. The working principle of the charging over-temperature/discharging over-temperature detection module is as follows:
the switch S21 is closed, the switches S23 and S22 are alternately opened, the positive input end V + of the comparator is sampled to the voltage division values of the resistors R1, R2, R3 and R4, the voltage V + is obtained by referring to a waveform diagram shown in FIG. 5, the switch S23 is opened to be an over-temperature protection voltage, and the switch S22 is opened to be an over-temperature protection release voltage;
the switch SC1 is closed to form a path of SC1 → RTC resistor → NTC resistor → GND, at the moment, the negative input end V-of the comparator is equal to the resistor divided voltage VA, V + and V-are compared, when the temperature rises, the NTC becomes smaller, the V- (VA) is reduced, when V- < V +, the comparator generates a charging over-temperature signal, the charging over-temperature signal is latched and transmitted to the logic circuit through the charging over-temperature detection, the CO drive is closed, and the charging loop is closed;
then the switch SC1 is switched off, the charging over-temperature signal is latched until the sampling in the next period is carried out again, the charging over-temperature protection is quitted, the latching is detected through the charging over-temperature, the latching is transmitted to a logic circuit, the CO driving is opened, and the charging loop is opened;
the switch SD1 is closed to form a path of SD1 → RTD resistance → NTC resistance → GND, the negative input end V-of the comparator is equal to resistance voltage division VA, V + and V-are compared, when the temperature rises, NTC becomes small, V- (VA) is reduced, when V- < V +, the comparator generates a discharge over-temperature signal, the discharge over-temperature signal is latched through discharge over-temperature detection and transmitted to the logic circuit, DO drive is closed, and a discharge loop is closed;
then the switch SD1 is turned off, the discharge over-temperature signal is latched until the next cycle for resampling, such as V- > V + sampled in the next cycle, the discharge over-temperature protection is quitted, the latch is detected through the discharge over-temperature and transmitted to the logic circuit, the DO drive is turned on, and the discharge loop is opened.
The CO driving of the chip design can drive the PMOS transistor or drive the NMOS transistor by gating, so that the application compatibility of the chip can be wider by combining with customer requirements, and as shown in fig. 6, the CO driving scheme includes a PMOS driving output port, an NMOS driving output port and an inverter; the inverter is connected with the input end of the PMOS drive output port, and the PMOS drive output port and the NMOS drive output port are respectively connected with the CO port through a switch. In connection with fig. 6, the path S1 or S2 is selected, i.e., whether the port defines the CO output port to drive either the PMOS drive output or the NMOS drive output.
The application diagrams of the multi-battery management chip system provided by the invention are shown in fig. 7-9, which only list 16-pin packaging, PACK + and PACK-are load wiring ports, and CH + and CH-are charger wiring ports. FIG. 7 shows a charge-discharge common-port NMOS charge-discharge system structure; FIG. 8 shows a charge-discharge differential, NMOS charge + NMOS discharge system structure; FIG. 9 shows a charge-discharge cross-port, PMOS charge + NMOS discharge system structure.
1) The battery pack is charged in an initial state, the cell voltage of the battery pack rises, and after a set overcharge voltage is exceeded, the battery pack is charged by: the battery voltage detection module → the overcharge signal processing module → the time delay circuit and the logic circuit → CO drive → the external charging MOS is closed, and the overcharge protection is generated;
overcharge protection release conditions: when the battery voltage is lower than the overcharge release voltage, the circuit can exit the overcharge protection state;
2) if charging is overcurrent, charging overcurrent protection is generated, through: the method comprises the following steps that (1) a VINI port → a charging overcurrent detection module → a time delay circuit and a logic circuit → CO drive → an external charging MOS is closed, meanwhile, a charger detection module of a VM port works to detect whether a charger exists, and if the charger exists, the external charging MOS is kept closed;
3) after the battery pack is fully charged, the battery pack enters a working state, after the battery pack is loaded, the voltage of the battery is gradually reduced, and when the voltage of the battery is lower than the overdischarge voltage, the battery pack is charged by: the battery voltage detection module → the over-discharge signal processing module → the time delay circuit and logic circuit → DO drive → the external discharge MOS is closed, and the over-discharge protection is generated;
overdischarge protection release condition: after the battery voltage is higher than the overdischarge release voltage, the circuit can exit the overdischarge protection state;
5) if discharge overcurrent occurs, discharge overcurrent protection is generated, through: the method comprises the following steps that (1) the VINI port → a discharging overcurrent detection module → a discharging overcurrent external delay control module → a delay circuit and a logic circuit → DO drive → the external discharging MOS is closed, meanwhile, a load detection module of the VM port works to detect whether a load exists, and if the load exists, the external discharging MOS is kept closed;
6) if the over-temperature protection occurs, the over-temperature protection is generated,
over-temperature protection of discharge is generated by: the discharge over-temperature detection module → the time delay circuit and the logic circuit → DO drive → turn off the external discharge MOS;
generating charging over-temperature protection by: the charging over-temperature detection module → the time delay circuit and the logic circuit → CO drive → the external charging MOS is closed.
The method adopts the MOM-CAP switched capacitor sampling technology, can accurately sample the voltage of each battery to obtain accurate overcharge and overdischarge detection voltage signals, and utilizes the periodic detection technology to reduce the loss, save the cost and improve the competitiveness of the product; by designing the battery disconnection detection, when any battery on the battery pack is abnormally disconnected, the chip battery disconnection detection system samples the disconnection abnormality, a system loop can be closed, the battery can be better protected, and the service life is prolonged; the external discharge overcurrent delay control controls the length of discharge overcurrent delay protection time through the size of an external capacitor, and better protection response can be realized according to requirements in application; the charge over-temperature and discharge over-temperature detection module utilizes the negative temperature characteristic of the NTC resistor, sets a required temperature protection point by adjusting the external RTD resistor and the external RTC resistor, has flexible design of the over-temperature protection point, and can design different over-temperature protection according to application requirements; when the charging overcurrent/discharging overcurrent detection module charges or discharges the battery, the required charging current and discharging overcurrent can be obtained by arranging the external Rsense resistor, so that the battery is better protected; by designing the load/charger detection module, when the chip is overdischarged or discharged and overcurrent occurs, whether a load exists or not can be detected, if the load exists, the DO port is enabled to be always at a low potential, the discharging loop is closed, the circuit enters a low power consumption state, the battery can be prevented from being overdischarged, and the service life of the battery can be prolonged; when overcharge or overcurrent occurs, whether a charger exists or not is detected, if the charger exists, the CO port is always in a low level, and a charging loop is closed, so that the over-high voltage of the battery can be prevented, and the safety and the service life of the battery are improved; CO driving and DO driving, namely controlling GATE of an external MOS tube, thereby realizing a charging and discharging loop of the battery; wherein the CO drive sets 2 output modes: one is to drive the external PMOS tube, and the other is to drive the external NMOS tube, so that the design greatly improves the compatibility of the chip.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (6)
1. A multi-cell battery management chip system, comprising:
the OSC module, the overcharge/overdischarge signal processing module, the disconnection signal processing module, the CO drive, the DO drive, the load/charger detection module, the charging overcurrent/discharging overcurrent detection module, the charging overtemperature/discharging overtemperature detection module and the discharging overcurrent external delay module are all connected with the delay circuit and the logic circuit module;
the battery voltage detection module and the battery disconnection detection module are respectively connected with the overcharge overdischarge signal processing module and the disconnection signal processing module;
the battery voltage detection module and the battery disconnection detection module are respectively connected with VD1 ports to VD5 ports; the CO drive and the DO drive are respectively connected with a CO port and a DO port; the load/charger detection module is connected with a VM port; the charging overcurrent/discharging overcurrent detection module is connected with the VINI port; the charging over-temperature/discharging over-temperature detection module is connected with the RTD port and the RTC port; the discharging overcurrent external delay module is connected with the TOC port.
2. The multi-battery management chip system of claim 1, wherein the battery voltage detection module comprises a capacitor V _ CAP, a switch S10-a switch S17, a capacitor C11-C14 and a comparator CMP;
two ends of the capacitor V _ CAP are respectively connected with a switch S13 and a switch S14, one end of a capacitor C11 is connected with the switch S13, and the other end is connected with a capacitor C13 and a switch S17 in series and is connected with a reference voltage VREF; one end of the capacitor C12 is connected with the switch S14, the other end is connected with the capacitor C14 in series, and the starting S16 is grounded;
the positive input terminal of the comparator CMP is connected between the capacitor C12 and the capacitor C14, and the negative input terminal is connected between the capacitor C11 and the capacitor C13;
the capacitor C13 and the switch S17 are grounded through the start S10, the positive input terminal of the comparator CMP is grounded through the switch S11, and the negative input terminal of the comparator CMP is grounded through the switch S12.
3. The multi-battery management chip system of claim 1, wherein the battery disconnection detecting module comprises five comparators, positive input terminals of the five comparators are respectively connected with the VD1 port, the VD2 port, the VD3 port, the VD4 port and the VD5 port; the negative input end is respectively connected with GND, VD1 port, VD2 port, VD3 port and VD4 port; the output ends of the five comparators are all connected to the disconnection signal processing module.
4. The multi-battery management chip system of claim 1, wherein the charging over-temperature/discharging over-temperature detection module comprises switches S21-S23, resistors R1-R4, switch SC1, switch SD1, switch SC2, switch SD2, an external resistor and a comparator;
the switch S21 is sequentially connected in series with the resistor R4, the resistor R3, the resistor R2 and the resistor R1 and then grounded;
the external resistor comprises an RTC resistor, an RTD resistor and an NTC resistor, the switch SC1 is connected with the RTC resistor in series and then grounded through the NTC resistor, and the switch SD1 is connected with the RTD resistor in series and then grounded through the NTC resistor;
the positive input end of the comparator is connected between the resistor R3 and the resistor R2 through the switch S22, and the positive input end is connected between the resistor R2 and the resistor R1 through the switch S23; the negative input of the comparator is connected between the switch SC1 and the RTC resistor through the switch SD2, while the negative input is connected between the switch SD1 and the RTD resistor through the switch SC 2.
5. The multi-battery management chip system of claim 1, wherein the CO driver comprises a PMOS drive output, an NMOS drive output, and an inverter; the inverter is connected with the input end of the PMOS drive output port, and the PMOS drive output port and the NMOS drive output port are respectively connected with the CO port through a switch.
6. The battery management system-on-chip of claim 1, wherein the battery management system-on-chip further comprises a 5V internal power supply and a 12V internal power supply; the 5V internal power supply is simultaneously connected with the battery voltage detection module, the OSC module, the delay circuit and logic circuit module and the 12V internal power supply; the 12V internal power supply is simultaneously connected to the 5V internal power supply and the CO and DO drivers.
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