CN105826958B - Balancing device for battery protection system and battery protection system - Google Patents
Balancing device for battery protection system and battery protection system Download PDFInfo
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- CN105826958B CN105826958B CN201510011349.XA CN201510011349A CN105826958B CN 105826958 B CN105826958 B CN 105826958B CN 201510011349 A CN201510011349 A CN 201510011349A CN 105826958 B CN105826958 B CN 105826958B
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Abstract
In the balancing device for the battery protection system, when the switch unit comprises the triode, the output control end of the control module is disconnected with the output control end of the balancing chip, the output control end of the processing module is connected with the output control end of the balancing chip, the processing module controls the conduction and the disconnection of the triode through the control end of the switch unit according to an input control signal, and the grounding end is connected with the selection end of the processing module. When the switch unit comprises an MOS tube, the output control end of the control module is connected with the output control end of the balance chip, and the control module controls the MOS tube to be switched on and off through the control end of the switch unit according to an input control signal. Above-mentioned balancing unit, when the switch unit includes the triode, the electric current that flows into balanced chip can flow to the ground, and this makes balancing unit can work under timesharing sampling and real-time sampling, and balancing unit is applicable to the balanced mode of drive MOS pipe type and drive triode type. The invention also discloses a battery protection system.
Description
Technical Field
The invention relates to the technical field of battery protection, in particular to a balancing device for a battery protection system and the battery protection system.
Background
In the field of multi-battery protection, in order to prolong the service life of a battery pack and improve the utilization rate of battery capacity, a balancing device is often added into a battery protection system, so that the capacities of all battery cells of the whole battery pack are balanced and consistent as much as possible in the charging and discharging processes. At present, one of the methods for realizing balance is based on the principle that a high-voltage battery is discharged through a discharge loop, redundant electric quantity is lost in the form of heat energy, balance of each battery is realized, and the realization method is relatively simple.
Currently, such a balance scheme is classified into a driving MOS transistor type and a driving transistor type from a discharge control loop. The advantages of the balancing device of the driving MOS transistor type are: voltage driving is adopted during balanced starting, and driving current is not needed, so that chip sampling is not influenced, and the method is suitable for real-time sampling and time-sharing sampling and has a wide application range; the disadvantages are that: in the whole application scheme, compared with a triode, the MOS tube GS is easily damaged, so that a balance loop fails, and even a battery is damaged.
The advantages of a balancing device of the type driving a triode are: compared with an MOS tube, the stability is good, and the MOS tube is not easy to damage; the disadvantages are that: when the balancing device works, current flows into the chip, and the sampling of the chip is inaccurate after the current passes through the sampling resistor, so that the current cannot be used as real-time sampling and is limited in a time-sharing sampling scheme, namely, the current is sampled when the balance is not started, and the current is not sampled when the balance is started. The time-sharing sampling causes the battery balancing efficiency to be greatly reduced, and affects the balancing speed.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, the present invention is directed to a balancing apparatus for a battery protection system and a battery protection system.
A balancing device for a battery protection system comprises a balancing chip and a switch unit, wherein the balancing chip comprises a control module and a processing module, the switch unit comprises a triode or an MOS (metal oxide semiconductor) tube MB, and the processing module comprises a grounding end;
the input control end of the control module and the input control end of the processing module are both connected with the input control end of the balance chip, the first output end of the control module is connected with the first output end of the balance chip, the second output end of the control module is connected with the second output end of the balance chip, and the first output end and the second output end of the balance chip are respectively connected with two poles of a protected battery;
the output control end of the balance chip is connected with the control end of the switch unit, the first end of the switch unit is connected with the first output end of the balance chip, and the second end of the switch unit is connected with the second output end of the balance chip;
when the switch unit comprises the triode, the output control end of the control module is disconnected with the output control end of the balance chip, the output control end of the processing module is connected with the output control end of the balance chip, the processing module controls the conduction and the disconnection of the triode through the control end of the switch unit according to an input control signal, and the grounding end is connected with the selection end of the processing module;
when the switch unit comprises the MOS tube MB, the output control end of the control module is connected with the output control end of the balance chip, and the control module controls the MOS tube MB to be switched on and off through the control end of the switch unit according to the input control signal.
Above-mentioned balancing unit, when the switch unit includes the triode, the current that flows into balanced chip through the output control terminal of balanced chip can flow to the ground end through processing module's output control terminal and earthing terminal, and this makes balancing unit also can be applicable to real-time sampling under the condition that can be used for the timesharing sampling, therefore has improved battery balance efficiency, has guaranteed balanced speed. Furthermore, the balancing device is suitable for balancing modes of a driving MOS tube type and a driving triode type, and has a wider application range.
In one embodiment, the balance chip includes a first connection member and a second connection member;
the first connecting piece is positioned between the output control end of the control module and the output control end of the balance chip, and the second connecting piece is positioned between the selection end of the processing module and the grounding end;
when the switch unit comprises the triode, the first connecting piece disconnects the output control end of the control module from the output control end of the balance chip, and the second connecting piece disconnects the selection end from the grounding end;
when the switch unit comprises the MOS tube, the first connecting piece is connected with the output control end of the control module and the output control end of the balance chip, and the second connecting piece is connected with the selection end and the grounding end.
In one embodiment, the control module includes a MOS transistor M1 and a MOS transistor M2, a gate terminal of the MOS transistor M1 and a gate terminal of the MOS transistor M2 are both connected to an input control terminal of the control module, a drain terminal of the MOS transistor M1 and a drain terminal of the MOS transistor M2 are both connected to an output control terminal of the control module, a source terminal of the MOS transistor M1 is connected to a first output terminal of the control module, and a source terminal of the MOS transistor M2 is connected to a second output terminal of the control module.
In one embodiment, the processing module comprises MOS tubes M3, M4, M5, M6 and a constant current source Idd;
the gate end of the MOS transistor M3 is connected with the input control end of the processing module, the drain end of the MOS transistor M3 is connected with the output control end of the processing module, and the source end of the MOS transistor M3 is connected with the drain end of the MOS transistor M4;
the gate end of the MOS transistor M4 is connected with the selection end, and the source end of the MOS transistor M4 is connected with the grounding end;
the drain terminal of the MOS tube M5 is connected with the selection terminal, the source terminal of the MOS tube M5 and the source terminal of the MOS tube M6 are both connected with the power supply terminal of the processing module, the gate terminal of the MOS tube M5 and the gate terminal of the MOS tube M6 are both connected with one end of a constant current source Idd, and the drain terminal of the MOS tube M6 is connected with one end of the constant current source Idd;
the other end of the constant current source Idd is connected to the ground terminal.
In one embodiment, the balancing device further includes resistors Ra, R2 and R3, the transistor includes a MOS transistor MB, the first output terminal of the balancing chip is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the drain terminal of the MOS transistor MB;
the output control end of the balance chip is connected with the gate end of the MOS tube MB, the source end of the MOS tube MB is connected with one end of the resistor Ra, the other end of the resistor Ra is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the second output end of the balance chip.
In one embodiment, the balancing apparatus further includes resistors Ra, R2, R3 and Rb, the switching unit includes a transistor QB, the first output terminal of the balancing chip is connected to one terminal of the resistor R3, and the other terminal of the resistor R3 is connected to the emitter of the transistor QB;
the output control end of the balance chip is connected with the base of a triode QB through a resistor Rb, the collector of the triode QB is connected with one end of a resistor Ra, the other end of the resistor Ra is connected with one end of a resistor R2, and the other end of a resistor R2 is connected with the second output end of the balance chip.
In one embodiment, the balancing apparatus further includes an output module, an output control terminal of the control module is connected to the first input terminal of the output module, an output control terminal of the processing module is connected to the second input terminal of the output module, and an output control terminal of the output module is connected to the output control terminal of the balancing chip.
A battery protection system includes a plurality of balancing devices and a plurality of batteries. Each balancing device comprises a balancing chip and a switch unit, the balancing chip comprises a control module and a processing module, the switch unit comprises a triode or an MOS (metal oxide semiconductor) tube, and the processing module comprises a grounding end;
the input control end of the control module and the input control end of the processing module are both connected with the input control end of the balance chip, the first output end of the control module is connected with the first output end of the balance chip, the second output end of the control module is connected with the second output end of the balance chip, and the first output end and the second output end of the balance chip are respectively connected with two poles of at least one battery;
the output control end of the balance chip is connected with the control end of the switch unit, the first end of the switch unit is connected with the first output end of the balance chip, and the second end of the switch unit is connected with the second output end of the balance chip;
when the switch unit comprises the triode, the output control end of the control module is disconnected with the output control end of the balance chip, the output control end of the processing module is connected with the output control end of the balance chip, the processing module controls the conduction and the disconnection of the triode through the control end of the switch unit according to an input control signal, and the grounding end is connected with the selection end of the processing module;
when the switch unit comprises the MOS tube, the output control end of the control module is connected with the output control end of the balance chip, and the control module controls the conduction and the disconnection of the MOS tube through the control end of the switch unit according to the input control signal.
In one embodiment, the balance chip includes a first connection member and a second connection member;
the first connecting piece is positioned between the output control end of the control module and the output control end of the balance chip, and the second connecting piece is positioned between the selection end of the processing module and the grounding end;
when the switch unit comprises the triode, the first connecting piece disconnects the output control end of the control module from the output control end of the balance chip, and the second connecting piece disconnects the selection end from the grounding end;
when the switch unit comprises the MOS tube, the first connecting piece is connected with the output control end of the control module and the output control end of the balance chip, and the second connecting piece is connected with the selection end and the grounding end.
A balancing device for a battery protection system comprises a balancing chip and a switch unit, wherein the balancing chip comprises a control module and a processing module, the switch unit comprises a triode, and the processing module comprises a grounding terminal;
the input control end of the control module and the input control end of the processing module are both connected with the input control end of the balance chip, the first output end of the control module is connected with the first output end of the balance chip, the second output end of the control module is connected with the second output end of the balance chip, and the first output end and the second output end of the balance chip are respectively connected with two poles of a protected battery;
the base electrode and the emitting electrode of the triode are both connected with the first output end of the balance chip, and the collector electrode of the triode is connected with the second output end of the balance chip;
the output control end of the processing module is connected with the first output end of the balance chip, the processing module controls the on and off of the triode according to an input control signal, and the grounding end is connected with the selection end of the processing module.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a block diagram illustrating a balancing apparatus for a battery protection system according to a preferred embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a balancing apparatus for a battery protection system according to a preferred embodiment of the present invention;
FIG. 3 is another schematic circuit diagram of a balancing apparatus for a battery protection system according to a preferred embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a balancing apparatus for a battery protection system according to a preferred embodiment of the present invention;
FIG. 5 is another block diagram of a balancing apparatus for a battery protection system according to a preferred embodiment of the present invention; and
fig. 6 is a circuit diagram of a battery protection system according to a preferred embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1, a balancing apparatus 100 for a battery protection system according to a preferred embodiment of the present invention includes a balancing chip 102 and a switch unit 104. In the present embodiment, the balancing apparatus 100 has an independent balancing control terminal BALX.
The balance chip 102 includes a control module 51 and a processing module 52, the switch unit 104 includes a transistor or a MOS transistor, the processing module 52 includes a ground terminal GND and a POWER terminal POWER, and the POWER terminal POWER is used for connecting an internal POWER supply of the balance chip.
The input control terminal a1 of the control module 51 and the input control terminal C1 of the processing module 52 are both connected to the input control terminal 106 of the balancing chip 102, the first output terminal a2 of the control module 51 is connected to the first output terminal V1 of the balancing chip 102, the second output terminal A3 of the control module 51 is connected to the second output terminal V2 of the balancing chip 102, the first output terminal V1 and the second output terminal V2 of the balancing chip 102 are used to connect to two poles V (X +1) and VX of the protected battery BX, for example, the pole V (X +1) is a positive pole of the battery, and VX is a negative pole of the battery.
The output control terminal BALX of the balance chip 102 is connected to the control terminal D of the switch unit 104, the first terminal E1 of the switch unit 104 is connected to the first output terminal V1 of the balance chip 102, and the second terminal E2 of the switch unit 104 is connected to the second output terminal V2 of the balance chip 102.
When the switch unit 104 includes a triode (i.e., the balance device 100 is a triode-driving type balance device), the output control terminal a4 of the control module 51 is disconnected from the output control terminal BALX of the balance chip 102, the output control terminal C2 of the processing module 52 is connected to the output control terminal BALX of the balance chip 102, the processing module 52 controls the triode to be turned on and off through the control terminal D of the switch unit 104 according to the input control signal CTX _ N, and the ground terminal GND is connected to the selection terminal C3 of the processing module 52. The input control signal CTX _ N is, for example, a control signal amplified by an amplifier.
When the switch unit 104 includes a MOS transistor (i.e., the balance device 100 is a balance device of a driving MOS transistor type), the output control terminal a4 of the control module 51 is connected to the output control terminal BALX of the balance chip 102, and the control module 51 controls the MOS transistor to be turned on and off through the control terminal D of the switch unit 104 according to the input control signal CTX _ N.
Specifically, the balanced chip 102 includes a first connection F1 and a second connection F2. The first connection F1 is located between the output control terminal A4 of the control module 51 and the output control terminal BALX of the balance chip 102, and the second connection F2 is located between the selection terminal C3 of the processing module 52 and the ground terminal GND.
Hereinafter, a first case when the switching unit 104 includes a transistor and a second case when the switching unit 104 includes a MOS transistor will be described.
The first case when switching unit 104 comprises transistor QB:
in this case, referring to fig. 2, the first connection F1 disconnects the output control terminal a4 of the control module 51 from the output control terminal BALX of the balance chip 102, and the second connection F2 disconnects the select terminal C3 from the ground GND. For example, in one embodiment, the first connection F1 is a first fuse and the second connection F2 is a second fuse. When the connection is broken, both the first fuse F1 and the second fuse F2 are broken. At this time, the output control terminal a4 of the control module 51 is not associated with the output control terminal BALX of the balance chip 102, and the output of the output control terminal BALX of the balance chip 102 is controlled by the output result of the processing module 52.
It is understood that in other embodiments, the balancing apparatus 100 may also select other types of connectors as long as the connection and disconnection between the output control terminal a4 of the control module 51 and the output control terminal BALX of the balancing chip 102 and the connection and disconnection between the selection terminal C3 and the ground terminal GND can be realized.
Specifically, the control module 51 includes a MOS transistor M1 and a MOS transistor M2, a gate end of the MOS transistor M1 and a gate end of the MOS transistor M2 are both connected to the input control end a1 of the control module 51, a drain end of the MOS transistor M1 and a drain end of the MOS transistor M2 are both connected to the output control end a4 of the control module 51, a source end of the MOS transistor M1 is connected to the first output end a2 of the control module 51, and a source end of the MOS transistor M2 is connected to the second output end A3 of the control module 51.
The processing module 52 includes MOS transistors M3, M4, M5, M6, and a constant current source Idd.
The gate terminal of the MOS transistor M3 is connected to the input control terminal C1 of the processing module 52, the drain terminal of the MOS transistor M3 is connected to the output control terminal C2 of the processing module 52, and the source terminal of the MOS transistor M3 is connected to the drain terminal of the MOS transistor M4.
The gate terminal of the MOS transistor M4 is connected to the selection terminal C3, and the source terminal of the MOS transistor M4 is connected to the ground terminal GND.
The drain terminal of the MOS transistor M5 is connected to the selection terminal C3, the source terminal of the MOS transistor M5 and the source terminal of the MOS transistor M6 are both connected to the POWER supply terminal POWER of the processing module 52, the gate terminal of the MOS transistor M5 and the gate terminal of the MOS transistor M6 are both connected to one end of the constant current source Idd, and the drain terminal of the MOS transistor M6 is connected to one end of the constant current source Idd. The other end of the constant current source Idd is connected to the ground GND.
The balancing apparatus 100 further includes resistors Ra, R2, R3 and Rb, the switching unit 104 includes a transistor QB, the first output terminal V1 of the balancing chip 102 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to an emitter of the transistor QB.
The output control terminal BALX of the balance chip 102 is connected to the base of the transistor QB through the resistor Rb, the collector of the transistor QB is connected to one end of the resistor Ra, the other end of the resistor Ra is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the second output terminal V2 of the balance chip 102. And an emitting electrode and a collecting electrode of the triode QB are respectively connected with two electrodes of the protected battery BX.
The output of the balancing chip 102 is controlled to be of a triode type. During operation, CTX _ N is an internal balance initial control signal, the control module 51 is a CMOS output, the MOS transistor M1 is a PMOS transistor, and the MOS transistor M2 is an NMOS transistor. The output control terminal a4 of the control module 51 is connected to the output control terminal BALX of the balance chip 102. The first connector F1 opens. The output control end BALX of the balance chip 102 is directly connected with the drain end of the MOS tube M3, the drain end of the MOS tube M4 is connected with the source end of the MOS tube M3, the second connecting piece F2 connected with the gate end of the MOS tube M4 is disconnected, the MOS tube M4 is only connected with the drain end of the MOS tube M5 of a mirror image constant current source, and the constant current source Idd is a generated constant current source, so that the gate end of the MOS tube M4 becomes high level, and the MOS tube M4 is connected.
When the input control signal CTX _ N is at a low level (GND), the output of the control module 51 is at a high level V3, but the first connection F1 disconnects the output control terminal a4 of the cavity module 51 from the output control terminal BALX of the balance chip 102. The second connection F2 is turned off, the gate terminal of the MOS transistor M4 is at a high level, and the MOS transistor M4 is turned on. The input control signal CTX _ N is low level, the MOS transistor M3 is turned off, the output of the MOS transistor M3 is in high impedance state, that is, the output control terminal BALX of the balance chip 102 is in high impedance state, no current flows between the base and the emitter of the triode QB in the external balance loop of the balance chip 102, the triode QB cannot be turned on, and the balance loop is not turned on.
When the input control signal CTX _ N becomes the high level V3, the output of the control module 51 is the low level V2, but the first connection F1 disconnects the output control terminal a4 of the cavity module 102 from the output control terminal BALX of the balance chip 102. When the input control signal CTX _ N is at a high level, the MOS transistor M3 is controlled to be turned on, the second connection F2 is disconnected, so that the gate terminal of the MOS transistor M4 is pulled up to a high level POWER voltage by the mirror constant current source M5, and the MOS transistor M4 is turned on. The current Ibe between the base and the emitter of the transistor QB controlled by the output control terminal BALX of the balancing chip 102 flows into the ground through the ground terminal GND of the processing module 52 via the output control terminal BALX, the output control terminal C2 of the processing module 52, the MOS transistors M3 and M4. Meanwhile, the triode QB is conducted, and the external balance loop is opened.
Second case when the switching unit 104 includes the MOS transistor MB:
referring to fig. 3, in this case, the specific circuit configuration of the balancing apparatus 100 is substantially the same as that of the balancing apparatus 100 of the first case. Except that the switching unit 104 includes a MOS transistor MB, and the balancing apparatus 100 omits the resistor Rb. The output control terminal BALX of the balance chip 102 is directly connected to the gate terminal of the MOS transistor MB. The other end of the resistor R3 is connected with the drain terminal of the MOS transistor MB. The source end of the MOS transistor MB is connected to one end of the resistor Ra.
The first connection F1 connects the output control terminal a4 of the control module 51 and the output control terminal BALX of the balance chip 102, and the second connection F2 connects the selection terminal C3 and the ground GND. For example, in one embodiment, the first connection F1 is a first fuse and the second connection F2 is a second fuse. When connected, the first fuse F1 and the second fuse F2 are not repaired. At this time, the output of the output control terminal BALX of the balance chip 102 is directly driven by the control module 51, and the processing module 52 is controlled by the second fuse F2, so that the output of the processing module 52 is in a high impedance state, and does not affect the output of the balance chip 102.
The output control of the balance chip 102 is of the MOS transistor type. In operation, CTX _ N is an internal balance initial control signal, and the control module 51 is a CMOS output. The MOS transistor M1 is a PMOS transistor, and the MOS transistor M2 is an NMOS transistor. The output control terminal a4 of the control module 51 is directly connected to the output control terminal BALX of the balance chip 102 through the first connection F1, and is directly connected to the drain terminal of the MOS transistor M3. The drain terminal of the MOS transistor M4 is connected with the source terminal of the MOS transistor M3. The gate terminal of the MOS transistor M4 is connected to the ground terminal GND through the second connection member F2, and the gate terminal of the MOS transistor M4 is also connected to the drain terminal of the mirror constant current source M5. The constant current source Idd is a generated constant current source. The first connector F1 and the second connector F2 are not disconnected and remain connected. Therefore, when the input control signal CTX _ N is at the high level V3, the output control terminal a4 of the control module 51 to the output control terminal BALX of the balance chip 102 is at the low level V2, the second connection F2 controls the gate terminal of the MOS transistor M4 to be connected to the ground GND, and the MOS transistor M4 is turned off. The MOS transistor M3 outputs a high resistance state. Therefore, the output control terminal BALX of the balance chip 102 is controlled by the output control terminal a4 of the control module 51 to output a low level, the balance control NMOS transistor MB is not turned on, and the balance loop is not turned on.
When the input control signal CTX _ N changes to the low level GND, the output control terminal a4 of the control module 51 outputs to the output control terminal BALX of the balance chip 102 to change to the high level V3, and meanwhile, the second connection F2 controls the gate terminal of the MOS transistor M4 to be connected to the ground GND, the MOS transistor M4 is turned off, and the MOS transistor M3 outputs the high impedance state. The output control end BALX of the balance chip 102 is controlled by the control module 51 to output a high level V3, the external balance three-transistor NMOS transistor MB is turned on, and the balance loop is turned on.
In summary, when the switching unit 104 of the balancing apparatus 100 includes the transistor QB, the current Ibe flowing into the balancing chip 102 through the output control terminal BALX of the balancing chip 102 flows to the ground terminal through the output control terminal C2 of the processing module 52 and the ground terminal GND, so that the balancing apparatus 100 can be applied to real-time sampling even when the current Ibe can be used for time-sharing sampling, thereby improving the battery balancing efficiency and ensuring the balancing speed. Meanwhile, when the switching unit 104 includes a MOS transistor, the above balancing apparatus 100 can also perform a balancing function of the battery. Therefore, the balancing apparatus 100 is also applicable to a driving MOS transistor type balancing method, and has a wider application range.
Referring to fig. 4, a balancing apparatus 200 for a battery protection system according to a preferred embodiment of the present invention is provided. The balancing apparatus 200 is substantially the same as the balancing apparatus 100 of the above embodiment in the case where the switching unit includes the triode, except that the balancing chip 202 omits a separate balancing control terminal BALX. The processing module 52 controls the on and off of the transistor QC according to the input control signal CTX _ N.
Specifically, the base and the emitter of the transistor QC of the switching unit are both connected to the first output terminal V1 of the balance chip 202, and the collector of the transistor QC is connected to the second output terminal V2 of the balance chip 202.
The output control terminal C2 of the processing module 52 is connected to the first output terminal V1 of the balance chip 202.
In operation, when the input control signal CTX _ N changes to the high level V3, the output of the control module 51 is at the low level V2, but since the first connection F1 is disconnected, the output control terminal a4 of the control module 51 is not connected to the first output terminal V1 of the balance chip 202. When the input control signal CTX _ N is at a high level, the MOS transistor M3 is controlled to be turned on, the second connection F2 is disconnected, so that the gate terminal of the MOS transistor M4 is pulled up to a high level POWER voltage by the mirror constant current source M5, and the MOS transistor M4 is turned on. The current Ibe between the base and the emitter of the transistor QC controlled by the first output terminal V1 of the balancing chip 202 flows into the ground through the ground terminal GND of the processing module 52 via the first output terminal V1 of the balancing chip 202, the output control terminal C2 of the processing module 52, the MOS transistors M3 and M4. Meanwhile, the triode QC is conducted, and the external balance loop is started.
In summary, when the switch unit of the balancing apparatus 200 includes the transistor QC, the current Ibe flowing into the balancing chip 202 through the first output terminal V1 of the balancing chip 202 flows to the ground terminal through the output control terminal C2 of the processing module 52 and the ground terminal GND, so that the balancing apparatus can be applied to real-time sampling under the condition of time-sharing sampling, thereby improving the battery balancing efficiency and ensuring the balancing speed.
Referring to fig. 5, in one embodiment, the balancing apparatus 300 further includes an output module 53, the output control terminal a4 of the control module 51 is connected to the first input terminal G1 of the output module 53, the output control terminal C2 of the processing module 52 is connected to the second input terminal G2 of the output module 53, and the output control terminal G3 of the output module 53 is connected to the output control terminal BALX of the balancing chip. The output module 53 is a balanced output module, and can be directly connected to the control module 51 to be output by the control module 51, or connected to the processing module 52 to be output by the processing module 52. Also, it may be connected to multiple inverter outputs.
Referring to fig. 6, a battery protection system 400 according to a preferred embodiment of the present invention includes a plurality of balancing devices 402 and a plurality of batteries 404. The plurality of batteries 404 are connected in series. In the present embodiment, each balancing device 402 is a driving transistor type balancing device, i.e., the switching unit of each balancing device 402 includes a transistor Q1, Q2, Q3 or Q4.
In the balancing device 402, a first output terminal and a second output terminal of the balancing chip 406 are respectively connected to two poles of one battery 304, for example, the first output terminal of the balancing chip 406 is connected to a positive pole of the battery 404, and the second output terminal of the balancing chip 306 is connected to a negative pole of the battery 404. It is understood that in other embodiments, the first output terminal of the balancing chip may be connected to the positive electrode of a battery pack, and the second output terminal of the balancing chip may be connected to the negative electrode of the battery pack, where the battery pack includes 2 or more batteries connected in series.
Specifically, in the present embodiment, the number of the balancing devices 402 and the number of the batteries 404 are both 4. The input control signals are CT1_ N, CT2_ N, CT3_ N and CT4_ N, respectively. The input control terminals of the balance chip 406 are BAL1, BAL2, BAL3 and BAL4, respectively. It is understood that in other embodiments, the number of balancing devices 402 and batteries 404 may be other numbers, such as 2 or more.
Above-mentioned battery protection system 400, when the switch unit includes the triode, the electric current that flows into balanced chip through the output control terminal of balanced chip can flow to the ground end through the output control terminal and the earthing terminal of processing module, and this makes battery protection system also can be applicable to real-time sampling under the condition that can be used for the timesharing sampling, therefore has improved battery balance efficiency, has guaranteed balanced speed. Furthermore, the battery protection system is suitable for a balance mode of a driving MOS tube type and a driving triode type, and has a wider application range.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A balancing device for a battery protection system is characterized by comprising a balancing chip and a switch unit, wherein the balancing chip comprises a control module and a processing module, the switch unit comprises a triode or an MOS (metal oxide semiconductor) tube MB, and the processing module comprises a grounding end;
the input control end of the control module and the input control end of the processing module are both connected with the input control end of the balance chip, the first output end of the control module is connected with the first output end of the balance chip, the second output end of the control module is connected with the second output end of the balance chip, and the first output end and the second output end of the balance chip are respectively connected with two poles of a protected battery;
the output control end of the balance chip is connected with the control end of the switch unit, the first end of the switch unit is connected with the first output end of the balance chip, and the second end of the switch unit is connected with the second output end of the balance chip;
when the switch unit comprises the triode, the output control end of the control module is disconnected with the output control end of the balance chip, the output control end of the processing module is connected with the output control end of the balance chip, the processing module controls the conduction and the disconnection of the triode through the control end of the switch unit according to an input control signal, and the grounding end is connected with the selection end of the processing module;
when the switch unit comprises the MOS tube MB, the output control end of the control module is connected with the output control end of the balance chip, and the control module controls the MOS tube MB to be switched on and off through the control end of the switch unit according to the input control signal.
2. The balancing apparatus of claim 1, wherein the balancing chip includes a first connector and a second connector;
the first connecting piece is positioned between the output control end of the control module and the output control end of the balance chip, and the second connecting piece is positioned between the selection end of the processing module and the grounding end;
when the switch unit comprises the triode, the first connecting piece disconnects the output control end of the control module from the output control end of the balance chip, and the second connecting piece disconnects the selection end from the grounding end;
when the switch unit comprises the MOS tube, the first connecting piece is connected with the output control end of the control module and the output control end of the balance chip, and the second connecting piece is connected with the selection end and the grounding end.
3. The balancing apparatus of claim 1, wherein the control module comprises a MOS transistor M1 and a MOS transistor M2, the gate terminal of the MOS transistor M1 and the gate terminal of the MOS transistor M2 are both connected to the input control terminal of the control module, the drain terminal of the MOS transistor M1 and the drain terminal of the MOS transistor M2 are both connected to the output control terminal of the control module, the source terminal of the MOS transistor M1 is connected to the first output terminal of the control module, and the source terminal of the MOS transistor M2 is connected to the second output terminal of the control module.
4. The balancing apparatus of claim 2, wherein the processing module comprises MOS transistors M3, M4, M5, M6 and a constant current source Idd;
the gate end of the MOS transistor M3 is connected with the input control end of the processing module, the drain end of the MOS transistor M3 is connected with the output control end of the processing module, and the source end of the MOS transistor M3 is connected with the drain end of the MOS transistor M4;
the gate end of the MOS transistor M4 is connected with the selection end, and the source end of the MOS transistor M4 is connected with the grounding end;
the drain terminal of the MOS tube M5 is connected with the selection terminal, the source terminal of the MOS tube M5 and the source terminal of the MOS tube M6 are both connected with the power supply terminal of the processing module, the gate terminal of the MOS tube M5 and the gate terminal of the MOS tube M6 are both connected with one end of a constant current source Idd, and the drain terminal of the MOS tube M6 is connected with one end of the constant current source Idd;
the other end of the constant current source Idd is connected to the ground terminal.
5. The balancing apparatus of claim 3, further comprising resistors Ra, R2 and R3, wherein the switching unit comprises a MOS transistor MB, the first output terminal of the balancing chip is connected to one terminal of the resistor R3, and the other terminal of the resistor R3 is connected to the drain terminal of the MOS transistor MB;
the output control end of the balance chip is connected with the gate end of the MOS tube MB, the source end of the MOS tube MB is connected with one end of the resistor Ra, the other end of the resistor Ra is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the second output end of the balance chip.
6. The balancing apparatus of claim 3, further comprising resistors Ra, R2, R3 and Rb, wherein the transistor comprises a transistor QB, the first output terminal of the balancing chip is connected to one terminal of the resistor R3, and the other terminal of the resistor R3 is connected to the emitter of the transistor QB;
the output control end of the balance chip is connected with the base of a triode QB through a resistor Rb, the collector of the triode QB is connected with one end of a resistor Ra, the other end of the resistor Ra is connected with one end of a resistor R2, and the other end of a resistor R2 is connected with the second output end of the balance chip.
7. The balancing apparatus of claim 1, further comprising an output module, wherein the output control terminal of the control module is connected to the first input terminal of the output module, the output control terminal of the processing module is connected to the second input terminal of the output module, and the output control terminal of the output module is connected to the output control terminal of the balancing chip.
8. A battery protection system comprises a plurality of balancing devices and a plurality of batteries, and is characterized in that each balancing device comprises a balancing chip and a switch unit, the balancing chip comprises a control module and a processing module, the switch unit comprises a triode or an MOS (metal oxide semiconductor) transistor, and the processing module comprises a grounding end;
the input control end of the control module and the input control end of the processing module are both connected with the input control end of the balance chip, the first output end of the control module is connected with the first output end of the balance chip, the second output end of the control module is connected with the second output end of the balance chip, and the first output end and the second output end of the balance chip are respectively connected with two poles of at least one battery;
the output control end of the balance chip is connected with the control end of the switch unit, the first end of the switch unit is connected with the first output end of the balance chip, and the second end of the switch unit is connected with the second output end of the balance chip;
when the switch unit comprises the triode, the output control end of the control module is disconnected with the output control end of the balance chip, the output control end of the processing module is connected with the output control end of the balance chip, the processing module controls the conduction and the disconnection of the triode through the control end of the switch unit according to an input control signal, and the grounding end is connected with the selection end of the processing module;
when the switch unit comprises the MOS tube, the output control end of the control module is connected with the output control end of the balance chip, and the control module controls the conduction and the disconnection of the MOS tube through the control end of the switch unit according to the input control signal.
9. The battery protection system of claim 8, wherein the balancing chip comprises a first connector and a second connector;
the first connecting piece is positioned between the output control end of the control module and the output control end of the balance chip, and the second connecting piece is positioned between the selection end of the processing module and the grounding end;
when the switch unit comprises the triode, the first connecting piece disconnects the output control end of the control module from the output control end of the balance chip, and the second connecting piece disconnects the selection end from the grounding end;
when the switch unit comprises the MOS tube, the first connecting piece is connected with the output control end of the control module and the output control end of the balance chip, and the second connecting piece is connected with the selection end and the grounding end.
10. A balancing device for a battery protection system is characterized by comprising a balancing chip and a switch unit, wherein the balancing chip comprises a control module and a processing module, the switch unit comprises a triode, and the processing module comprises a grounding end;
the input control end of the control module and the input control end of the processing module are both connected with the input control end of the balance chip, the first output end of the control module is connected with the first output end of the balance chip, the second output end of the control module is connected with the second output end of the balance chip, and the first output end and the second output end of the balance chip are respectively connected with two poles of a protected battery;
the base electrode and the emitting electrode of the triode are both connected with the first output end of the balance chip, and the collector electrode of the triode is connected with the second output end of the balance chip;
the output control end of the processing module is connected with the first output end of the balance chip, the processing module controls the on and off of the triode according to an input control signal, and the grounding end is connected with the selection end of the processing module.
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| CN101752624B (en) * | 2010-01-13 | 2014-06-11 | 深圳市京泉华科技股份有限公司 | Equalizing charge method and equalizing charge device for battery |
| JP5823098B2 (en) * | 2010-05-27 | 2015-11-25 | ラピスセミコンダクタ株式会社 | Cell balance system |
| KR101478494B1 (en) * | 2011-03-18 | 2014-12-31 | 아사히 가세이 일렉트로닉스 가부시끼가이샤 | Circuit for balance-charging serial storage cells and method for balance-charging serial storage cells |
| CN103187743B (en) * | 2011-12-29 | 2015-05-13 | 比亚迪股份有限公司 | Battery protective chip cascade balance control device and battery protective chip |
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