CN116154728A - Battery protection controller and battery protection circuit - Google Patents
Battery protection controller and battery protection circuit Download PDFInfo
- Publication number
- CN116154728A CN116154728A CN202111385770.9A CN202111385770A CN116154728A CN 116154728 A CN116154728 A CN 116154728A CN 202111385770 A CN202111385770 A CN 202111385770A CN 116154728 A CN116154728 A CN 116154728A
- Authority
- CN
- China
- Prior art keywords
- battery
- protection
- signal
- turn
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 127
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000005856 abnormality Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 13
- 230000002159 abnormal effect Effects 0.000 description 11
- 238000007599 discharging Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- 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
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a battery protection controller and a battery protection circuit, which are used for controlling the conduction state of a plurality of groups of switching tubes connected in series between a battery and a charge-discharge port so as to realize charge-discharge protection of the battery, and comprise the following components: a protection circuit for generating a protection signal according to a battery voltage and an operating current of the battery; and the heartbeat detection circuit is used for synchronously generating a first turn-off trigger signal and a second turn-off trigger signal when receiving the protection signal, wherein the protection signal, the first turn-off trigger signal and the second turn-off trigger signal are all used for realizing bidirectional turn-off control of a plurality of groups of switch tubes. The invention can preferentially ensure the separation of the battery when the controller fails, and can realize the mutual correlation between the two output control ports of the controller, thereby ensuring that when the switching tube at one output control port has a problem, the switching tube at the other output port can still ensure the separation of the battery, further protecting the battery and improving the safety and reliability of the battery protection circuit.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery protection controller and a battery protection circuit.
Background
Batteries such as lithium batteries have been widely used in products such as portable electronic devices and electric vehicles. The battery repeatedly undergoes a charge-discharge process during a life period, and in a charge state, current is supplied from an external current to the battery, and in a discharge state, current is supplied from the battery to an external load. The battery protection circuit provides bidirectional protection for the battery in the charge and discharge process, such as overvoltage protection, undervoltage protection, overcurrent protection, short-circuit protection and the like, so as to prevent the service life and performance of the battery from being damaged by abnormal conditions in the charge and discharge process.
Fig. 1 shows a schematic diagram of a battery protection circuit according to the prior art. The battery protection circuit 100 includes switching transistors M1, M2 connected in series between a negative electrode B-and a negative charge-discharge terminal P-of the battery 101, and a battery protection controller (simply referred to as a controller or a controller chip) 110 that controls the on state of the switching transistors M1, M2. Further, the battery protection circuit 100 further includes a resistor R1 and a capacitor C1 connected in series between the positive and negative electrodes (b+, B-) of the battery 101 for generating a supply voltage Vdd required for the battery protection controller 110 to operate normally according to the battery voltage of the battery 101. The positive electrode b+ of the battery 101 is connected to the positive charge/discharge terminal p+.
In the normal charge state of the battery 101, both the switching transistors M1, M2 are in the on state. If an abnormality is detected during the charging process, the switching tube M2 is turned off to terminate the charging process. In the normal discharge state of the battery 101, both the switching transistors M1, M2 are in the on state. If an abnormality is detected during the discharging process, the switching tube M1 is turned off to terminate the charging process. In the battery protection circuit 100, two switching tubes M1 and M2 are used to realize charge and discharge protection of the battery 101, wherein the substrate of the switching tube M1 is biased to the negative end of the battery, and the substrate of the switching tube M2 is biased to the negative end of an external power supply. When one of the charging process and the discharging process of the battery is abnormal, the battery protection controller 110 only controls one switching tube to be turned off, and the parasitic diode of the switching tube does not influence the normal operation of the other process in the charging process and the discharging process, so that the safety performance of the whole battery protection circuit is easily influenced when the switching tube is abnormal, and the reliability is low.
Therefore, in view of battery safety, it is desired to further improve the reliability of the battery protection circuit.
Disclosure of Invention
In order to solve the technical problems, the invention provides a battery protection controller and a battery protection circuit, wherein a heartbeat detection circuit is arranged in the battery protection controller, so that when a controller chip fails, the battery can be preferentially ensured to be separated, and meanwhile, the mutual correlation between two output control ports of the controller can be realized, and when a switching tube at one output control port is in a problem, the switching tube at the other output port can still ensure the separation of the battery, thereby improving the safety and reliability of the battery protection circuit.
According to a first aspect of the present disclosure, there is provided a battery protection controller comprising: the battery protection controller is used for controlling the conduction states of a plurality of groups of switching tubes connected in series between the battery and the charging and discharging ports so as to realize charging and discharging protection of the battery, and comprises:
a protection circuit for generating a protection signal according to a battery voltage and an operating current of the battery;
a heartbeat detection circuit for synchronously generating a first turn-off trigger signal and a second turn-off trigger signal when the protection signal is received,
the protection signal, the first turn-off trigger signal and the second turn-off trigger signal are all used for realizing bidirectional turn-off control of the plurality of groups of switch tubes.
Optionally, the heartbeat detection circuit is further configured to detect a state parameter of a specific pulse signal, and generate the first shutdown trigger signal and the second shutdown trigger signal synchronously when detecting that the state parameter of the specific pulse signal is abnormal, where the specific pulse signal is used to characterize the working state of the battery protection controller.
Optionally, the battery protection controller further includes:
the first control signal generating circuit is used for outputting a first turn-off control signal at a first output end of the battery protection controller to realize bidirectional turn-off control of a first group of switch tubes in the plurality of groups of switch tubes when receiving any one of the protection signal and the first turn-off trigger signal;
and the second control signal generating circuit is used for outputting a second turn-off control signal at the second output end of the battery protection controller to realize bidirectional turn-off control of a second group of switch tubes in the plurality of groups of switch tubes when receiving any one of the protection signal and the second turn-off trigger signal.
Optionally, the protection circuit includes:
a first protection unit for generating a first protection signal according to a battery voltage and an operating current of the battery;
and the second protection unit is used for generating a second protection signal according to the battery voltage and the working current of the battery.
Optionally, the heartbeat detection circuit includes:
the first heartbeat detection unit is connected with the first protection unit and is used for generating a first turn-off trigger signal when receiving the first protection signal;
a second heartbeat detection unit connected with the second protection unit and used for generating a second turn-off trigger signal when receiving the second protection signal,
the first heartbeat detection unit and the second heartbeat detection unit are respectively provided with a reset detection mechanism, and are mutually associated based on the reset detection mechanisms;
when any one of the first heartbeat detection unit and the second heartbeat detection unit receives a protection signal to generate a corresponding turn-off trigger signal, the other one of the first heartbeat detection unit and the second heartbeat detection unit synchronously generates the corresponding turn-off trigger signal based on the reset detection mechanism.
Optionally, the first heartbeat detection unit and the second heartbeat detection unit are both integrated in the battery protection controller and are respectively located in different voltage areas of the battery protection controller.
Optionally, the first protection unit is configured to implement at least one of charge overvoltage detection, charge overcurrent detection, discharge undervoltage detection, discharge overcurrent detection, and discharge short circuit detection for the battery;
the second protection unit is used for realizing at least one of charge overvoltage detection, charge overcurrent detection, discharge undervoltage detection, discharge overcurrent detection and discharge short circuit detection of the battery.
Optionally, the first protection signal and the second protection signal each include at least one of a charge inhibit signal and a discharge inhibit signal.
According to a second aspect of the present disclosure, there is provided a battery protection circuit comprising: a plurality of groups of switching tubes connected in series between a battery and a charge-discharge port of the battery; and
the battery protection controller is connected with the plurality of groups of switch tubes and is used for controlling the conduction states of the plurality of groups of switch tubes according to the battery voltage and the working current of the battery so as to realize the charge and discharge protection of the battery.
Optionally, the plurality of groups of switching tubes include: the first switching tube, the second switching tube, the third switching tube and the fourth switching tube;
the first switching tube and the second switching tube are connected with the common drain electrode, and the grid electrode of the first switching tube and the grid electrode of the second switching tube are connected with the first output end of the battery protection controller;
the third switching tube and the fourth switching tube are connected with the common drain electrode, and the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are connected with the second output end of the battery protection controller.
The beneficial effects of the invention at least comprise:
the battery protection controller (simply referred to as a controller in this document) of the embodiment of the invention realizes the on-off control of the connection path between the battery and the charge and discharge ports thereof by controlling the on-state of the plurality of groups of switching tubes, and the heartbeat detection circuit in the controller can realize the mutual correlation between the two output ends of the controller, so that when a problem occurs in one group of switching tubes at one output end of one controller, the connection path between the battery and the charge and discharge ports thereof can still be disconnected by one group of switching tubes at the other output end of the controller, and the battery is ensured to be separated. Meanwhile, each group of switch tubes at each output end of the controller can realize bidirectional turn-off, so that the battery is further protected, and the safety and reliability of a battery protection circuit are improved.
In a further embodiment, the heartbeat detection circuit can monitor the working state of the controller, and when the controller fails, the connection path between the battery and the charge and discharge port of the controller is disconnected, so that the battery is preferentially ensured to be separated, and the safety and reliability of the battery protection circuit are further improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
Fig. 1 is a schematic diagram showing a structure of a conventional battery protection circuit;
fig. 2 is a schematic diagram showing the structure of another conventional battery protection circuit;
fig. 3 is a schematic diagram showing the structure of a battery protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic view showing an internal structure of the battery protection controller of fig. 3.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
As shown in fig. 2, which is a schematic diagram of a battery protection circuit in the prior art, the battery protection circuit 200 improves the safety of the battery protection circuit 200 by controlling the conductive states of the 4 switching transistors M1, M2, M3, and M4 by using two battery protection controllers 210 and 220, respectively, but this increases the occupied area of the battery protection circuit 200, resulting in an increase in the manufacturing cost of the battery protection circuit 200. And as shown in fig. 2, the two battery protection controllers 210 and 220 in the battery protection circuit 200 have no signal communication with each other, and operate independently of each other, and the reliability is still low.
The battery protection circuit 300 provided by the present invention is shown in fig. 3, wherein the battery 301 has a first output terminal, a second output terminal, a first charge-discharge terminal p+ and a second charge-discharge terminal P-. The first output of the battery 301 may be the positive electrode b+ of the battery and the second output of the battery 301 may be the negative electrode B-of the battery. In this embodiment, the first charge and discharge end p+ of the battery 301 is directly connected to the positive electrode b+ of the battery, and the second charge and discharge end P-of the battery 301 is connected to the negative electrode B-of the battery through multiple groups of switching tubes. Optionally, some batteries 301 also have an NTC terminal (as the case may be, some batteries are not), the NTC terminal of the battery 301 being for connection with an NTC terminal of an external device.
The battery protection circuit 300 specifically includes: battery protection controller 310, and a plurality of groups of switching tubes connected to the output terminal of battery protection controller 310. Wherein, a plurality of groups of switching tubes are connected in series between an output end, e.g., B-, of the battery 301 and a charge-discharge port, e.g., P-, of the battery 301, and the plurality of groups of switching tubes are connected in series with each other. The battery protection controller 310 is configured to control the on states of the plurality of groups of switching tubes according to the battery voltage and the working current of the battery 301, so as to realize the connection and disconnection control of the battery 301 in the power utilization system or the charging system, and realize the charge and discharge protection of the battery 301.
In some embodiments, battery protection controller 310 may be fabricated as a control chip. At this time, the battery protection controller 310 has a power supply terminal V DD Ground end V SS The sampling terminal CS, the first output terminal DO, the second output terminal CO and the charge and discharge detection terminal VM. Wherein, the power supply end V DD Is connected to the positive electrode b+ of the battery 301 through a first resistor R31, and is connected to the negative electrode B-of the battery 301 through a capacitor C31. Ground end V SS Is connected to the negative electrode B of the battery 301. Ground end V SS Is connected to the negative electrode B of the battery 301. The sampling end CS is formed by adopting a resistor R SNS Is connected to the negative electrode B of the battery 301. The first output terminal DO and the first switch tubes of the multiple groupsThe group switch tubes are connected. The second output ends CO are respectively connected with a second group of switch tubes in the plurality of groups of switch tubes. The charge/discharge detection terminal VM is connected to the second charge/discharge terminal P of the battery 301 through the second resistor R32.
Each of the plurality of sets of switching transistors includes a pair of common drain connected transistors of the same type. In this embodiment, a first group of switching tubes of the multiple groups of switching tubes includes a first switching tube M1 and a second switching tube M2. The first switching tube M1 and the second switching tube M2 are connected at the common drain, and the gate of the first switching tube M1 and the gate of the second switching tube M2 are both connected with the first output terminal DO of the battery protection controller 310 to receive the first control signal Vgs1. The second group of switching tubes of the plurality of groups of switching tubes comprises a third switching tube M3 and a fourth switching tube M4. The third switching tube M3 and the fourth switching tube M4 are connected at the common drain, and the gate of the third switching tube M3 and the gate of the fourth switching tube M4 are both connected with the second output terminal CO of the battery protection controller 310 to receive the second control signal Vgs2. Alternatively, the first switching tube M1, the second switching tube M2, the third switching tube M3 and the fourth switching tube M4 are, for example, NMOS transistors, and it should be noted that, according to the level states of the first control signal Vgs1 and the second control signal Vgs2, the first control signal Vgs1 in the high level state is referred to as a first on control signal, the second control signal Vgs2 in the high level state is referred to as a second on control signal, the first control signal Vgs1 in the low level state is referred to as a first off control signal, the second control signal Vgs2 in the low level state is referred to as a second off control signal, which corresponds to a scheme of using an NMOS transistor as a switching tube.
In the present embodiment, when a load is connected between the first charge-discharge terminal p+ and the second charge-discharge terminal P-of the battery 301, the battery 301 discharges and supplies current to the load. And when the charger is connected between the first charge-discharge terminal p+ and the second charge-discharge terminal P-of the battery 301, the battery 301 is charged. When the battery 301 is normally discharged or charged, the battery protection controller 310 outputs a turn-on control signal through the first output terminal DO and the second output terminal CO to control the plurality of groups of switching tubes to be turned on simultaneously, so that a current loop is formed between the battery and the load or the charging device; when the battery 301 is abnormally discharged or the discharge abnormality triggers the protection, the battery protection controller 310 controls the plurality of groups of switching tubes to be simultaneously turned off by synchronously outputting the turn-off control signals through the first output end DO and the second output end CO, and cuts off the charge-discharge loop of the battery 301 to realize the charge-discharge protection of the battery 301.
Fig. 4 shows a schematic diagram of the internal structure of a battery protection controller according to an embodiment of the present invention, and as shown in fig. 4, a battery protection controller 310 according to the present embodiment includes a protection circuit 311 and a heartbeat detection circuit 312. The protection circuit 311 is used for generating a protection signal according to the battery voltage and the operating current of the battery 301. The heartbeat detection circuit 312 is connected to the protection circuit 311 for generating the first turn-off trigger signal and the second turn-off trigger signal synchronously when the protection signal is received. The protection signal, the first turn-off trigger signal and the second turn-off trigger signal are all used for realizing bidirectional turn-off control of the plurality of groups of switch tubes.
Further, the battery protection controller 310 further includes: a first control signal generation circuit 313 and a second control signal generation circuit 314. The first control signal generating circuit 313 is configured to output a first shutdown control signal at the first output terminal DO of the battery protection controller 310 to implement bidirectional shutdown control for a first group of switching tubes (including the first switching tube M1 and the second switching tube M2) among the plurality of groups of switching tubes when receiving any one of the protection signal and the first shutdown trigger signal. The second control signal generating circuit 314 is configured to output a second turn-off control signal at the second output terminal CO of the battery protection controller 310 to implement bidirectional turn-off control for a second group of switching tubes (including the third switching tube M3 and the fourth switching tube M4) among the plurality of groups of switching tubes when receiving any one of the protection signal and the second turn-off trigger signal.
In this embodiment, the first shutdown trigger signal and the protection signal may be used as enable signals to trigger the first control signal generating circuit 313 to output the first shutdown control signal with a low level, and at the same time, the first control signal generating circuit 313 may be triggered to output the first shutdown control signal with a low level by directly cutting off the driving power of the first control signal generating circuit 313, so as to reduce the circuit power consumption. Similarly, the second turn-off trigger signal and the protection signal may be used as enable signals to trigger the second control signal generating circuit 314 to output the first turn-off control signal with a low level, and at the same time, may also trigger the second control signal generating circuit 314 to output the second turn-off control signal with a low level by directly cutting off the driving power of the second control signal generating circuit 314, so as to reduce the power consumption of the circuit.
The protection circuit 311 is internally provided with a comparator, and by comparing the parameters of current, voltage, temperature and the like of the battery 301 obtained by sampling with corresponding thresholds, charge and discharge detection including charge overvoltage detection, charge overcurrent detection, discharge undervoltage detection, discharge overcurrent detection, discharge short circuit detection, overtemperature detection and the like of the battery 301 can be realized, and further, the protection circuit 311 generates corresponding protection signals when confirming that the battery 301 has charge and discharge abnormality according to the comparison result, and triggers and turns off a plurality of groups of switching tubes in the battery protection circuit 300 to realize charge and discharge protection of the battery 301.
In this embodiment, the protection circuit 311 includes: a first protection unit 3111 and a second protection unit 3112. The first protection unit 3111 is for generating a first protection signal according to a battery voltage and an operating current of the battery 301; the second protection unit 3112 is for generating a second protection signal according to a battery voltage and an operating current of the battery 301. Wherein the first protection unit 3111 is configured to implement at least one of charge overvoltage detection, charge overcurrent detection, discharge undervoltage detection, discharge overcurrent detection, and discharge short circuit detection for the battery 301; the second protection unit 3112 is for implementing at least one of charge overvoltage detection, charge overcurrent detection, discharge undervoltage detection, discharge overcurrent detection, and discharge short circuit detection for the battery 301. And the first protection signal and the second protection signal each include at least one of a charge inhibit signal and a discharge inhibit signal.
Alternatively, the charge and discharge detection items of the battery 301 that can be achieved by each of the first protection unit 3111 and the second protection unit 3112 may be the same or different. And when the charge and discharge detection items of the battery 301 that can be achieved by the first protection unit 3111 and the second protection unit 3112 are the same, it is preferable to configure the first protection unit 3111 and the second protection unit 3112 to be capable of achieving all the charge and discharge detection items of the battery 301, so that the capability of the battery protection circuit 300 to cope with abnormal conditions can be improved by repeated detection of the results of the two sets of protection units, for example, detection of a detection item can still be achieved when the detection circuit of a certain detection item is abnormal or damaged, reliability and safety of battery protection are improved, and two protection signals that can be generated by the two protection units at this time achieve bidirectional turn-off of multiple sets of switching tubes simultaneously. However, when the charge and discharge detection items of the battery 301 that can be achieved by the first protection unit 3111 and the second protection unit 3112 are different, it is preferable to configure the first protection unit 3111 and the second protection unit 3112 to cooperate with each other to achieve the whole charge and discharge detection items of the battery 301, so that the number of required components can be saved, and the cost can be reduced.
Further, the heartbeat detection circuit 312 is further configured to detect a state parameter (such as a frequency, a high-low level voltage, an interrupt time, etc.) of the specific pulse signal in the battery protection controller 310, and generate the first shutdown trigger signal and the second shutdown trigger signal synchronously when detecting that the state parameter of the specific pulse signal is abnormal. Wherein the specific pulse signal is used to characterize the operation state of the battery protection controller 310. That is, the present invention can also realize the detection of the self state of the battery protection controller 310 based on the heartbeat detection circuit 312, so that when the battery protection controller 310 fails, the switch-off of the plurality of groups of switch tubes in the battery protection circuit 300 can be controlled, the detachment of the battery 301 is preferentially ensured, the charge and discharge protection of the battery is realized, and the reliability and the safety of the battery protection circuit are further improved.
In this embodiment, the heartbeat detection circuit 312 includes: the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 connected are associated. The first heartbeat detection unit 3121 is connected to the first protection unit 3111 for generating a first off trigger signal upon receipt of the first protection signal. The second heartbeat detection unit 3122 is connected to the second protection unit 3112 for generating a second off trigger when the second protection signal is received. Wherein, the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 are both provided with a reset detection mechanism, and are associated with each other based on the reset detection mechanism. When any one of the first and second heartbeat detection units 3121 and 3122 receives the protection signal to generate a corresponding turn-off trigger signal, the other one of the first and second heartbeat detection units 3121 and 3122 also synchronously generates a corresponding turn-off trigger signal based on the reset detection mechanism.
For example, the reset detection mechanisms in the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 may be configured to count based on the heartbeat signal (a specific pulse signal generated inside the battery protection controller 310, and may characterize that the battery protection controller 310 is malfunctioning at this time when the pulse signal is abnormal), where it may be set that the off trigger signal is not generated only when the count values of the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 are in a preset range (for example, greater than a and less than b, where a and b are both positive integers); when the count values of the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 are within a preset range (for example, greater than a and less than b, where a and b are both positive integers), the off trigger signal is not generated. Further, when the first and second heartbeat detection units 3121 and 3122 do not receive the protection signal and the heartbeat signal is normal, the first and second heartbeat detection units 3121 transmit the reset signal Rst1 to the second heartbeat detection unit 3122 every predetermined time to reset the second heartbeat detection unit 3122, and the second heartbeat detection unit 3122 transmit the reset signal Rst2 to the first heartbeat detection unit 3122 every predetermined time to reset the first heartbeat detection unit 3121 such that the count values when the first and second heartbeat detection units 3121 and 3122 are reset are within the preset range. When the first heartbeat detecting unit 3121 and the second heartbeat detecting unit 3122 receive the protection signal or the heartbeat signal is abnormal, the heartbeat detecting functions of the first heartbeat detecting unit 3121 and the second heartbeat detecting unit 3122 are turned off, that is, the first heartbeat detecting unit 3121 and the second heartbeat detecting unit 3122 are not reset, and further, the first heartbeat detecting unit 3121 and the second heartbeat detecting unit 3122 are automatically reset when each count to a certain value greater than the count value b, and at this time, the count value when reset is greater than the count value b and is out of the preset range, so the first heartbeat detecting unit 3121 and the second heartbeat detecting unit 3122 generate corresponding turn-off trigger signals to trigger to turn off the plurality of groups of switch tubes. Or when the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 receive other reset signals so that the count value when reset is smaller than the count value a and is out of the preset range, the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 each generate a corresponding turn-off trigger signal to trigger the turn-off of the plurality of groups of switching tubes. Of course, it is understood that the above configuration of the reset mechanism in the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 is merely exemplary, and that other conventional configuration methods may be employed in other embodiments of the present invention as long as the same objects as described above are achieved.
In a preferred embodiment of the present invention, the first heartbeat detection unit 3121 and the second heartbeat detection unit 3122 are both integrated within the battery protection controller 310 and are respectively located within different voltage regions of the battery protection controller 310, for example, respectively located at two corners of the controller chip. Thus, when the battery protection controller 310 chip is damaged and part of the internal structure is destroyed, a heartbeat detection unit can still work normally to provide charge and discharge protection for the battery 301.
It can be understood that in this embodiment, since two switching tubes (such as the first switching tube M1 and the second switching tube M2, or the third switching tube M3 and the fourth switching tube M4) in each of the plurality of groups of switching tubes are connected with a common drain and receive the same control signal, when the battery 301 triggers protection, each of the plurality of groups of switching tubes can realize a bidirectional turn-off function (in which parasitic diodes of the two switching tubes in each group of switching tubes are connected in reverse series) under the control of the turn-off control signal output by the battery protection controller 310, so that a charging loop and a discharging loop of the battery 301 can be simultaneously disconnected, and safety and reliability of the battery in case of abnormal charging and discharging are improved. In addition, in the embodiment of the present invention, one battery protection controller 310 is used to control two groups of switching tubes connected with common drains, so that not only the occupation area and the manufacturing cost of the battery protection circuit 300 are reduced, but also the multiple groups of switching tubes can be simultaneously turned off based on the turn-off control signals synchronously output by the battery protection controller 310 at the first output terminal DO and the second output terminal CO, that is, the first switching tube M1 to the fourth switching tube M4 are controlled to be simultaneously turned off, so that even if one output terminal of the battery protection controller 310 outputs an abnormality or a part of switching tubes in the multiple groups of switching tubes work abnormally, the charging circuit and the discharging circuit of the battery 301 can be disconnected when the charging and discharging of the battery 301 are abnormal, so as to realize the charging and discharging protection of the battery 301, and further improve the safety and reliability. It should be noted that the embodiment of the present invention is only exemplified by two groups of switching tubes, but in other embodiments of the present invention, more than 2 output ports of the battery protection controller 310 and more than 2 groups of switching tubes may be provided, which is not limited to this.
In summary, the battery protection controller according to the embodiment of the present invention controls the on states of the plurality of groups of switching tubes to realize the on-off control of the connection paths between the battery and the charge/discharge ports thereof, and the heartbeat detection circuit in the controller can realize the correlation between the two output ends of the controller, so that when a problem occurs in one group of switching tubes at one output end of one controller, the connection paths between the battery and the charge/discharge ports thereof can still be disconnected by the other group of switching tubes at the other output end of the controller, thereby ensuring the disconnection of the battery. Meanwhile, each group of switch tubes at each output end of the controller can realize bidirectional turn-off, so that the battery is further protected, and the safety and reliability of a battery protection circuit are improved.
In a further embodiment, the heartbeat detection circuit can monitor the working state of the controller, and when the controller fails, the connection path between the battery and the charge and discharge port of the controller is disconnected, so that the battery is preferentially ensured to be separated, and the safety and reliability of the battery protection circuit are further improved.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. A battery protection controller for controlling the conductive states of a plurality of groups of switching tubes connected in series between a battery and a charge-discharge port to realize charge-discharge protection of the battery, wherein the battery protection controller comprises:
a protection circuit for generating a protection signal according to a battery voltage and an operating current of the battery;
a heartbeat detection circuit for synchronously generating a first turn-off trigger signal and a second turn-off trigger signal when the protection signal is received,
the protection signal, the first turn-off trigger signal and the second turn-off trigger signal are all used for realizing bidirectional turn-off control of the plurality of groups of switch tubes.
2. The battery protection controller of claim 1, wherein the heartbeat detection circuit is further configured to detect a state parameter of a specific pulse signal, and generate the first shutdown trigger signal and the second shutdown trigger signal synchronously when an abnormality in the state parameter of the specific pulse signal is detected, where the specific pulse signal is used to characterize an operating state of the battery protection controller.
3. The battery protection controller of claim 1, wherein the battery protection controller further comprises:
the first control signal generating circuit is used for outputting a first turn-off control signal at a first output end of the battery protection controller to realize bidirectional turn-off control of a first group of switch tubes in the plurality of groups of switch tubes when receiving any one of the protection signal and the first turn-off trigger signal;
and the second control signal generating circuit is used for outputting a second turn-off control signal at the second output end of the battery protection controller to realize bidirectional turn-off control of a second group of switch tubes in the plurality of groups of switch tubes when receiving any one of the protection signal and the second turn-off trigger signal.
4. The battery protection controller of claim 1, wherein the protection circuit comprises:
a first protection unit for generating a first protection signal according to a battery voltage and an operating current of the battery;
and the second protection unit is used for generating a second protection signal according to the battery voltage and the working current of the battery.
5. The battery protection controller of claim 4 wherein the heartbeat detection circuit comprises:
the first heartbeat detection unit is connected with the first protection unit and is used for generating a first turn-off trigger signal when receiving the first protection signal;
a second heartbeat detection unit connected with the second protection unit and used for generating a second turn-off trigger signal when receiving the second protection signal,
the first heartbeat detection unit and the second heartbeat detection unit are respectively provided with a reset detection mechanism, and are mutually associated based on the reset detection mechanisms;
when any one of the first heartbeat detection unit and the second heartbeat detection unit receives a protection signal to generate a corresponding turn-off trigger signal, the other one of the first heartbeat detection unit and the second heartbeat detection unit synchronously generates the corresponding turn-off trigger signal based on the reset detection mechanism.
6. The battery protection controller of claim 5 wherein the first and second heartbeat detection units are each integrated within the battery protection controller and are each located within a different voltage region of the battery protection controller.
7. The battery protection controller according to claim 4, wherein the first protection unit is configured to implement at least one of charge overvoltage detection, charge overcurrent detection, discharge undervoltage detection, discharge overcurrent detection, and discharge short circuit detection for the battery;
the second protection unit is used for realizing at least one of charge overvoltage detection, charge overcurrent detection, discharge undervoltage detection, discharge overcurrent detection and discharge short circuit detection of the battery.
8. The battery protection controller of claim 4 wherein the first protection signal and the second protection signal each comprise at least one of a charge inhibit signal and a discharge inhibit signal.
9. A battery protection circuit, comprising:
a plurality of groups of switching tubes connected in series between a battery and a charge-discharge port of the battery; and
the battery protection controller according to any one of claims 1 to 8, wherein the battery protection controller is connected to the plurality of groups of switching tubes and is configured to control the conducting states of the plurality of groups of switching tubes according to the battery voltage and the operating current of the battery, so as to implement charge-discharge protection of the battery.
10. The battery protection circuit of claim 9 wherein the plurality of sets of switching tubes comprise: the first switching tube, the second switching tube, the third switching tube and the fourth switching tube;
the first switching tube and the second switching tube are connected with the common drain electrode, and the grid electrode of the first switching tube and the grid electrode of the second switching tube are connected with the first output end of the battery protection controller;
the third switching tube and the fourth switching tube are connected with the common drain electrode, and the grid electrode of the third switching tube and the grid electrode of the fourth switching tube are connected with the second output end of the battery protection controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111385770.9A CN116154728A (en) | 2021-11-22 | 2021-11-22 | Battery protection controller and battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111385770.9A CN116154728A (en) | 2021-11-22 | 2021-11-22 | Battery protection controller and battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116154728A true CN116154728A (en) | 2023-05-23 |
Family
ID=86358718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111385770.9A Pending CN116154728A (en) | 2021-11-22 | 2021-11-22 | Battery protection controller and battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116154728A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070108754A (en) * | 2006-05-08 | 2007-11-13 | 삼성에스디아이 주식회사 | Battery pack |
| US20130106355A1 (en) * | 2011-10-27 | 2013-05-02 | Bong-Young KIM | Battery pack and method of controlling the same |
| JP2014050235A (en) * | 2012-08-31 | 2014-03-17 | Hitachi Maxell Ltd | Secondary battery pack having charge/discharge protective function |
| JP2017208880A (en) * | 2016-05-16 | 2017-11-24 | 株式会社デンソー | Battery pack monitoring system |
| CN110048476A (en) * | 2019-04-02 | 2019-07-23 | 深圳市稳先微电子有限公司 | A kind of battery protection driving circuit and battery protection drive system |
| CN110148986A (en) * | 2019-06-03 | 2019-08-20 | 长沙优力电驱动系统有限公司 | Battery core charge and discharge control module and battery core protective device |
| US20200220347A1 (en) * | 2017-09-23 | 2020-07-09 | Huawei Technologies Co., Ltd. | Power protection apparatus and terminal using apparatus |
| CN112994177A (en) * | 2021-04-12 | 2021-06-18 | 泰克曼(南京)电子有限公司 | Battery module with dual protection capability and electric breathing equipment |
-
2021
- 2021-11-22 CN CN202111385770.9A patent/CN116154728A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070108754A (en) * | 2006-05-08 | 2007-11-13 | 삼성에스디아이 주식회사 | Battery pack |
| US20130106355A1 (en) * | 2011-10-27 | 2013-05-02 | Bong-Young KIM | Battery pack and method of controlling the same |
| JP2014050235A (en) * | 2012-08-31 | 2014-03-17 | Hitachi Maxell Ltd | Secondary battery pack having charge/discharge protective function |
| JP2017208880A (en) * | 2016-05-16 | 2017-11-24 | 株式会社デンソー | Battery pack monitoring system |
| US20200220347A1 (en) * | 2017-09-23 | 2020-07-09 | Huawei Technologies Co., Ltd. | Power protection apparatus and terminal using apparatus |
| CN110048476A (en) * | 2019-04-02 | 2019-07-23 | 深圳市稳先微电子有限公司 | A kind of battery protection driving circuit and battery protection drive system |
| CN110148986A (en) * | 2019-06-03 | 2019-08-20 | 长沙优力电驱动系统有限公司 | Battery core charge and discharge control module and battery core protective device |
| CN112994177A (en) * | 2021-04-12 | 2021-06-18 | 泰克曼(南京)电子有限公司 | Battery module with dual protection capability and electric breathing equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3211752B1 (en) | Battery pack | |
| KR20080060177A (en) | Battery state monitoring circuit and battery device | |
| EP3537564A1 (en) | Circuits, systems, and methods for protecting batteries | |
| CN112583079A (en) | Battery protection circuit and device | |
| CN105958442A (en) | Overheat protection method and circuit and mobile terminal | |
| CN110783997A (en) | Battery protection circuit and battery discharging device | |
| KR102586102B1 (en) | Battery protection circuit and battery pack including same | |
| EP3817232B1 (en) | Nmos switch driving circuit and power supply device | |
| CN116154728A (en) | Battery protection controller and battery protection circuit | |
| TW202101854A (en) | Power control circuit and power control method | |
| CN110063028B (en) | Communication system of battery pack and battery pack including the same | |
| CN114172258A (en) | Switching circuit with automatic battery selection function and power supply device thereof | |
| JPH10150721A (en) | Protective circuit for secondary battery | |
| CN110871688A (en) | Motor controller, motor driving system and new energy automobile | |
| CN210433405U (en) | Machine working circuit and dust collector comprising same | |
| CN219960138U (en) | Battery management system and electronic equipment | |
| CN215452523U (en) | Battery pack protection circuit | |
| CN210629090U (en) | Battery protection circuit | |
| CN211377645U (en) | Electronic device for rechargeable battery | |
| CN116505474B (en) | Battery protection circuit and electronic device | |
| CN211918391U (en) | Motor controller, motor driving system and new energy automobile | |
| CN211655761U (en) | Battery protection circuit and battery discharging device | |
| CN112311023B (en) | Power control circuit and power control method | |
| CN210837547U (en) | Mechanical switch circuit structure | |
| CN113937748A (en) | Direct current power supply equipment and direct current distribution box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |