CN116995623A - HV-EFUSE system of battery pack - Google Patents

HV-EFUSE system of battery pack Download PDF

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Publication number
CN116995623A
CN116995623A CN202310919884.XA CN202310919884A CN116995623A CN 116995623 A CN116995623 A CN 116995623A CN 202310919884 A CN202310919884 A CN 202310919884A CN 116995623 A CN116995623 A CN 116995623A
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CN
China
Prior art keywords
pole
efuse
resistor
switching tube
battery pack
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Granted
Application number
CN202310919884.XA
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Chinese (zh)
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CN116995623B (en
Inventor
刘方
张衡
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Suzhou Bovo Innovation Energy Technology Co ltd
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Suzhou Bovo Innovation Energy Technology Co ltd
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Priority to CN202310919884.XA priority Critical patent/CN116995623B/en
Priority claimed from CN202310919884.XA external-priority patent/CN116995623B/en
Publication of CN116995623A publication Critical patent/CN116995623A/en
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Publication of CN116995623B publication Critical patent/CN116995623B/en
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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
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a HV-EFUSE system of a battery pack, which is correspondingly connected with the battery pack, wherein the battery pack comprises: the battery pack, positive input/output end, negative input/output end, thermistor, precharge resistor, first switch tube and second switch tube, the anodal one end that links to each other with precharge resistor of battery pack, precharge resistor's the other end links to each other with the third pole of first switch tube, thermistor's one end links to each other with positive input/output end, thermistor's the other end links to each other with the third pole of second switch tube, wherein, HV-EFUSE system includes: the two current acquisition units are used for acquiring current between the positive input/output end and the positive electrode of the battery pack; and the N EFUSE units are used for controlling the positive input/output terminal to stop charging or discharging when the current is larger than a preset value. The invention can control the charge and discharge of the battery pack and realize the safe turn-off of the battery pack loop.

Description

HV-EFUSE system of battery pack
Technical Field
The invention relates to the technical field of semiconductor electronic power distribution, in particular to an HV-EFUSE (HV electronic fuse, HV series battery fuse) system of a battery pack.
Background
In the current society, various new energy technologies are growing increasingly, and new energy automobiles are developing particularly rapidly, wherein the technical field of lithium batteries in the new energy automobiles is particularly important. However, as the lithium battery is widely used in various industries, the safety problem of the lithium battery becomes a primary problem, and many new safety problems are caused by the changeable environments of different fields, among the various safety problems of the lithium battery, the frequency of occurrence of short circuit is the highest due to the overcurrent of the battery, and the influence is the most serious.
Disclosure of Invention
The invention aims to provide an HV-EFUSE system of a battery pack.
The technical solution for realizing the purpose of the invention is as follows:
an HV-EFUSE system of a battery pack, the HV-EFUSE system being correspondingly coupled to the battery pack, the battery pack comprising: the battery pack, positive input/output end, negative input/output end, thermistor, precharge resistor, first switch tube and second switch tube, the anodal with precharge resistor's one end links to each other, precharge resistor's the other end with first switch tube's third pole links to each other, thermistor's one end with positive input/output end links to each other, thermistor's the other end with second switch tube's third pole links to each other, wherein, HV-EFUSE system includes: two current collection units, wherein a first current collection unit is arranged between the positive electrode of the battery pack and the positive input/output end and is used for collecting a first current between the positive input/output end and the positive electrode of the battery pack, and a second current collection unit is arranged between the negative electrode of the battery pack and the negative input/output end and is used for collecting a second current between the negative input/output end and the negative electrode of the battery pack; and N EFUSE units, wherein the first to i EFUSE units are arranged between the positive electrode of the battery pack and the positive input/output end and are used for controlling the positive input/output end to stop charging and/or discharging when the first current is larger than a first preset value, the i+1 to N EFUSE units are arranged between the negative electrode of the battery pack and the negative input/output end and are used for controlling the negative input/output end to stop charging or discharging when the second current is larger than a second preset value, wherein N is an integer larger than or equal to 2, and i is an integer larger than or equal to 1 and smaller than N.
In one embodiment of the present invention, the EFUSE unit comprises: the first input pin and the second input pin of the photoelectric coupler are respectively connected with the controller; one end of the first capacitor is connected with a first power pin of the photoelectric coupler, and the other end of the first capacitor is connected with a second power pin of the photoelectric coupler; one end of the second capacitor is connected with one end of the first capacitor, and the other end of the second capacitor is connected with the other end of the first capacitor; the positive electrode of the voltage source is connected with one end of the second capacitor, and the negative electrode of the voltage source is connected with the other end of the second capacitor; one end of the first resistor is connected with an output pin of the photoelectric coupler; one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected with the negative electrode of the voltage source; and the first pole of the third switching tube is connected with the other end of the first resistor, and the second pole of the third switching tube is connected with the other end of the second resistor.
In one embodiment of the present invention, the current acquisition unit includes: sampling a resistor; an isolation amplifier; one end of the third resistor is connected with one end of the sampling resistor, and the other end of the third resistor is connected with the first input end of the isolation amplifier; one end of the fourth resistor is connected with the other end of the sampling resistor, and the other end of the fourth resistor is connected with the second input end of the isolation amplifier; the first capacitor is connected with the other end of the third resistor, and the other end of the first capacitor is connected with the first grounding end of the isolation amplifier and one end of the third resistor respectively; one end of the second capacitor is connected with the other end of the third resistor, and the other end of the second capacitor is connected with the other end of the fourth resistor; one end of the third capacitor is connected with the first grounding end of the isolation amplifier, and the other end of the third capacitor is connected with the other end of the fourth resistor; one end of the fourth capacitor is connected with the first power supply end of the isolation amplifier, and the other end of the fourth capacitor is grounded; one end of the fifth resistor is connected with the first output end of the isolation amplifier, and the other end of the fifth resistor is connected with the controller; one end of the sixth resistor is connected with the second output end of the isolation amplifier, and the other end of the sixth resistor is connected with the controller; one end of the fifth capacitor is connected with the other end of the fifth resistor, and the other end of the fifth capacitor is connected with the other end of the sixth resistor; and one end of the sixth capacitor is connected with the second power supply end of the isolation amplifier, and the other end of the sixth capacitor is grounded.
In one embodiment of the present invention, N is equal to 4, i is equal to 2, wherein a third pole of the third switching tube in the first EFUSE unit is connected to the positive pole of the battery pack, and a second pole of the third switching tube in the first EFUSE unit is connected to the second pole of the first switching tube; one end of a sampling resistor in a first current acquisition unit is connected with a second pole of the third switching tube in the first EFUSE unit; the second pole of the third switching tube in the second EFUSE unit is connected with the other end of the sampling resistor in the first current acquisition unit, and the third pole of the third switching tube in the second EFUSE unit is connected with the positive input/output end; a third pole of the third switch tube in a third EFUSE unit is connected with the negative pole of the battery pack; one end of a sampling resistor in a second current acquisition unit is connected with a second pole of the third switching tube in a third EFUSE unit; and a second pole of the third switching tube in the fourth EFUSE unit is respectively connected with the other end of the sampling resistor in the second current acquisition unit and the second pole of the second switching tube, and a third pole of the third switching tube in the fourth EFUSE unit is connected with a negative input/output end.
In another embodiment of the present invention, N is equal to 2, i is equal to 1, wherein a third pole of the third switching tube in the first EFUSE unit is connected to the positive pole of the battery pack, and a second pole of the third switching tube in the first EFUSE unit is connected to the second pole of the first switching tube; one end of a sampling resistor in a first current acquisition unit is connected with a second pole of the third switching tube in the first EFUSE unit, and the other end of the sampling resistor in the first current acquisition unit is connected with the positive input/output end; one end of a sampling resistor in the second current acquisition unit is connected with the negative electrode of the battery pack; and a second pole of the third switching tube in the second EFUSE unit is respectively connected with the other end of the sampling resistor in the second current acquisition unit and the second pole of the second switching tube, and a third pole of the third switching tube in the second EFUSE unit is connected with a negative input/output end.
In yet another embodiment of the present invention, N is equal to 3,i and 1, wherein the third pole of said third switching tube in the first of said EFUSE units is connected to the positive pole of said battery pack and the second pole of said third switching tube in the first of said EFUSE units is connected to the second pole of said first switching tube; one end of a sampling resistor in a first current acquisition unit is connected with a second pole of the third switching tube in the first EFUSE unit, and the other end of the sampling resistor in the first current acquisition unit is connected with the positive input/output end; a third pole of the third switch tube in the second EFUSE unit is connected with the negative pole of the battery pack; one end of a sampling resistor in a second current acquisition unit is connected with a second pole of the third switching tube in a third EFUSE unit; and a second pole of the third switching tube in the third EFUSE unit is respectively connected with the other end of the sampling resistor in the second current acquisition unit and the second pole of the second switching tube, and a third pole of the third switching tube in the third EFUSE unit is connected with a negative input/output end.
In one embodiment of the present invention, freewheeling diodes are disposed inside the first, second and third switching tubes.
Compared with the prior art, the invention has the remarkable advantages that:
the invention can control the charge and discharge of the battery pack and realize the safe turn-off of the battery pack loop.
Drawings
FIG. 1 is a schematic diagram of an HV-EFUSE system for a battery pack according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an EFUSE unit according to one embodiment of the invention;
FIG. 3 is a schematic diagram of a current collection unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the HV-EFUSE system of a battery pack according to one embodiment of the invention;
FIG. 5 is a schematic diagram of an HV-EFUSE system for a battery pack according to another embodiment of the invention;
fig. 6 is a schematic structural view of an HV-EFUSE system of a battery pack according to still another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
FIG. 1 is a flow chart of a SLAM method in a dynamic environment according to an embodiment of the present invention.
As shown in fig. 1, in the HV-EFUSE system of the battery pack according to the embodiment of the present invention, the HV-EFUSE system is correspondingly connected to the battery pack, and the battery pack includes: the battery PACK Vcc, positive input/output end PACK+, negative input/output end PACK-, thermistor PTC, precharge resistor Rc, first switch tube Q1 and second switch tube Q2, the positive pole of battery PACK Vcc links to each other with precharge resistor Rc's one end, precharge resistor Rc's the other end links to each other with first switch tube Q1's third pole, thermistor Rptc's one end links to each other with positive input/output end PACK+, thermistor Rptc's the other end links to each other with second switch tube's third pole, wherein, HV-EFUSE system includes: two current collection units 100, wherein the first current collection unit 100 is arranged between the positive pole of the battery PACK Vcc and the positive input/output end PACK+ for collecting a first current between the positive input/output end PACK+ and the positive pole of the battery PACK Vcc, and the second current collection unit 100 is arranged between the negative pole of the battery PACK Vcc and the negative input/output end PACK for collecting a second current between the negative input/output end PACK-and the negative pole of the battery PACK Vcc; and N EFUSE units 200, wherein the first to i-th EFUSE units 200 are disposed between the positive electrode of the battery Vcc and the positive input/output terminal pack+ for controlling the positive input/output terminal pack+ to stop charging or discharging when the first current is greater than a first preset value, and the i+1-th EFUSE units 200 are disposed between the negative electrode of the battery Vcc and the negative input/output terminal PACK-for controlling the negative input/output terminal PACK-to stop charging or discharging when the second current is greater than a second preset value, wherein N is an integer greater than or equal to 2, and i is an integer greater than or equal to 1 and less than N.
In one embodiment of the present invention, as shown in FIG. 2, EFUSE unit 200 may comprise: the photoelectric coupler U1, the first capacitor C1, the second capacitor C2, the voltage source V1, the first resistor R1, the second resistor R2 and the third switching tube Q3.
The first input pin and the second input pin of the photoelectric coupler U1 are respectively connected with the controller; one end of the first capacitor C1 is connected with a first power pin of the photoelectric coupler U1, and the other end of the first capacitor C1 is connected with a second power pin of the photoelectric coupler U1; one end of the second capacitor C2 is connected with one end of the first capacitor C1, and the other end of the second capacitor C2 is connected with the other end of the first capacitor C1; the positive electrode of the voltage source V1 is connected with one end of the second capacitor C2, and the negative electrode of the voltage source V1 is connected with the other end of the second capacitor C2; one end of the first resistor R1 is connected with an output pin of the photoelectric coupler U1; one end of the second resistor R2 is connected with the other end of the first resistor R1, and the other end of the second resistor R2 is connected with the negative electrode of the voltage source V1; the first pole of the third switching tube Q3 is connected with the other end of the first resistor R1, and the second pole of the third switching tube Q3 is connected with the other end of the second resistor R2.
In one embodiment of the present invention, as shown in fig. 3, the current collection unit 100 may include: sampling resistor Rs, isolation amplifier Q4, third resistor R3, fourth resistor R4, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, fifth resistor R5, sixth resistor R6, seventh capacitor C7 and eighth capacitor C8.
One end of the third resistor R3 is connected with one end of the sampling resistor R, and the other end of the third resistor R3 is connected with the first input end of the isolation amplifier Q4; one end of a fourth resistor R4 is connected with the other end of the sampling resistor Rs, and the other end of the fourth resistor R4 is connected with the second input end of the isolation amplifier Q4; the third capacitor C3 is connected with the other end of the third resistor R3, and the other end of the third capacitor C3 is respectively connected with the first grounding end of the isolation amplifier Q4 and one end of the third resistor R3; one end of the fourth capacitor C4 is connected with the other end of the third resistor R3, and the other end of the fourth capacitor C4 is connected with the other end of the fourth resistor R4; one end of a fifth capacitor C5 is connected with the first grounding end of the isolation amplifier Q4, and the other end of the fifth capacitor C5 is connected with the other end of the fourth resistor R4; one end of a sixth capacitor C6 is connected with the first power supply end of the isolation amplifier Q4, and the other end of the sixth capacitor C6 is grounded; one end of a fifth resistor R5 is connected with the first output end of the isolation amplifier Q4, and the other end of the fifth resistor R5 is connected with the controller; one end of a sixth resistor R6 is connected with the second output end of the isolation amplifier Q4, and the other end of the sixth resistor R6 is connected with the controller; one end of the seventh capacitor C7 is connected with the other end of the fifth resistor R5, and the other end of the fifth capacitor C7 is connected with the other end of the sixth resistor R6; one end of the eighth capacitor C8 is connected to the second power supply end of the isolation amplifier Q4, and the other end of the eighth capacitor C8 is grounded.
In one embodiment of the present invention, as shown in fig. 1 and 2, the first, second and third switching transistors Q1, Q2 and Q3 may each be provided with a freewheel diode inside.
Wherein, as a possible implementation manner, the third switching tube Q3 may be an IGBT (Insulated Gate Bipolar Transistor, source-gate bipolar transistor), and the first pole of the IGBT may be a base, the second pole of the IGBT may be an emitter, and the third pole of the IGBT may be a collector; as another possible implementation, the third switching transistor Q3 may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-Oxide semiconductor field effect transistor), and the first pole of the MOSFET may be the drain, the second pole of the MOSFET may be the gate, and the third pole of the MOSFET may be the source.
In one embodiment of the present invention, as shown in fig. 4, N may be equal to 2 and i may be equal to 1, where the third pole of the third switching tube Q3 in the first EFUSE unit 200 is connected to the positive pole of the battery Vcc, and the second pole of the third switching tube Q3 in the first EFUSE unit 200 is connected to the second pole of the first switching tube Q1; one end of a sampling resistor Rs in the first current acquisition unit 100 is connected with a second pole of a third switching tube Q3 in the first EFUSE unit 200, and the other end of the sampling resistor Rs in the first current acquisition unit 100 is connected with a positive input/output end PACK+; one end of a sampling resistor Rs in the second current acquisition unit 100 is connected with the negative electrode of the battery pack Vcc; the second pole of the third switching tube Q3 in the second EFUSE unit 200 is connected to the other end of the sampling resistor Rs in the second current collecting unit 100 and the second pole of the second switching tube Q3, respectively, and the third pole of the third switching tube Q3 in the second EFUSE unit 200 is connected to the negative input/output terminal PACK-.
Specifically, as shown in fig. 2, 3 and 4, during discharging of the battery PACK, when the trigger signal is input to the input terminal of the photo coupler U1 in the first EFUSE unit 200, the output pin of the photo coupler U1 in the first EFUSE unit 200 outputs a high level to the first pole of the corresponding third switching tube Q3, at this time, the third switching tube Q3 in the first EFUSE unit 200 is turned on, and similarly, the trigger signal may be input to the input terminal of the photo coupler U1 in the second EFUSE unit 200, at this time, the positive pole of the battery Vcc is turned on with the positive input/output terminal pack+, the negative pole of the battery Vcc is turned on with the negative input/output terminal PACK, and the battery Vcc and the positive input/output terminal pack+ form a discharging circuit with the load and the negative input/output terminal PACK connected with the positive input/output terminal pack+ and the negative input/output terminal PACK respectively. In the discharging process of the battery PACK, if the first current is greater than the first preset value, it indicates that the first current between the positive electrode of the battery PACK Vcc and the positive input/output end pack+ is too large, at this time, the photocoupler U1 in the first EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3, so as to control the corresponding third switching tube Q3 to be turned off, i.e., to control the connection between the positive electrode of the battery PACK Vcc and the positive input/output end pack+ to be disconnected, thereby effectively preventing the risk of circuit burnout caused by the too large first current. Similarly, if the second current is greater than the second preset value, it indicates that the second current between the negative electrode of the battery Vcc and the negative input/output terminal PACK-is too large, and at this time, the photocoupler U1 in the second EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3, so as to control the corresponding third switching tube Q3 to be turned off, i.e., to control the connection between the negative electrode of the battery Vcc and the negative input/output terminal PACK-to be disconnected, thereby effectively preventing the risk of circuit burnout caused by the too large second current.
In another embodiment of the present invention, as shown in fig. 5, N may be equal to 3,i and equal to 1, wherein the third pole of the third switching tube Q3 in the first EFUSE unit 200 is connected to the positive pole of the battery Vcc, and the second pole of the third switching tube Q3 in the first EFUSE unit 200 is connected to the second pole of the first switching tube Q1; one end of a sampling resistor Rs in the first current acquisition unit 100 is connected with a second pole of a third switching tube Q3 in the first EFUSE unit 200, and the other end of the sampling resistor Rs in the first current acquisition unit 100 is connected with a positive input/output end PACK+; a third pole of the third switch tube Q3 in the second EFUSE unit 200 is connected with the negative pole of the battery pack Vcc; one end of a sampling resistor Rs in the second current acquisition unit 100 is connected with a second pole of a third switching tube Q3 in the third EFUSE unit 200; the second pole of the third switching tube Q3 in the third EFUSE unit 200 is connected to the other end of the sampling resistor Rs in the second current collecting unit 100 and the second pole of the second switching tube Q3, and the third pole of the third switching tube Q3 in the third EFUSE unit 200 is connected to the negative input/output terminal PACK-.
Specifically, as shown in fig. 2, 3 and 5, during the discharging process of the battery PACK, when the trigger signal is input to the input terminal of the photo coupler U1 in the first EFUSE unit 200, the output pin of the photo coupler U1 in the first EFUSE unit 200 outputs a high level to the first pole of the corresponding third switch tube Q3, at this time, the third switch tube Q3 in the first EFUSE unit 200 is turned on, and similarly, the trigger signal may be input to the input terminal of the photo coupler U1 in the third EFUSE unit 200, wherein, since the third switch tube Q3 in the third EFUSE unit 200 has a freewheeling diode, no control is needed, at this time, the negative pole of the battery Vcc is turned on with the negative input/output terminal PACK-, and the battery Vcc, the positive input/output terminal pack+ and the load connected with the positive input/output terminal pack+ and the negative input/output terminal PACK respectively form a discharging loop. In the discharging process of the battery PACK, if the first current is greater than the first preset value, it indicates that the first current between the positive electrode of the battery PACK Vcc and the positive input/output end pack+ is too large, at this time, the photocoupler U1 in the first EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3, so as to control the corresponding third switching tube Q3 to be turned off, i.e., to control the connection between the positive electrode of the battery PACK Vcc and the positive input/output end pack+ to be disconnected, thereby effectively preventing the risk of circuit burnout caused by the too large first current. Similarly, if the second current is greater than the second preset value, it indicates that the first current between the negative electrode of the battery Vcc and the negative input/output terminal PACK-is too large, and at this time, the photocoupler U1 in the third EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3, so as to control the corresponding third switching tube Q3 to be turned off, i.e., to control the connection between the negative electrode of the battery Vcc and the negative input/output terminal PACK-to be disconnected, thereby effectively preventing the risk of circuit burnout caused by the too large second current.
Further, as shown in fig. 2, 3 and 5, during the charging process of the battery PACK, when the trigger signal is input to the input terminal of the photo coupler U1 in the second EFUSE unit 200, the output pin of the photo coupler U1 in the second EFUSE unit 200 outputs a high level to the first pole of the corresponding third switching tube Q3, at this time, the third switching tube Q3 in the second EFUSE unit 200 is turned on, wherein, because of the freewheeling diodes in the third switching tube Q3 in the first EFUSE unit 200 and the third switching tube Q3 in the third EFUSE unit 200, no control is needed, at this time, the positive pole of the battery Vcc is turned on with the positive input/output terminal pack+, the negative pole of the battery Vcc is turned on with the negative input/output terminal PACK-, and the battery Vcc, the positive input/output terminal pack+ and the negative input/output terminal PACK-respectively form a charging loop. In the charging process of the battery PACK, if the first current is greater than the first preset value or the second current is greater than the second preset value, it indicates that the first current between the positive electrode of the battery Vcc and the positive input/output terminal pack+ is too large or the second current between the negative electrode of the battery Vcc and the negative input/output terminal PACK-is too large, at this time, the photo coupler U1 in the second EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3 to control the corresponding third switching tube Q3 to be turned off, i.e., to control the disconnection between the negative electrode of the battery Vcc and the negative input/output terminal PACK-so as to effectively prevent the risk of circuit burnout caused by the excessively large first current or the second current.
In still another embodiment of the present invention, as shown in fig. 6, N may be equal to 4, i is equal to 2, wherein the third pole of the third switching tube Q3 in the first EFUSE unit 200 is connected to the positive pole of the battery Vcc, and the second pole of the third switching tube Q3 in the first EFUSE unit 200 is connected to the second pole of the first switching tube Q31; one end of a sampling resistor Rs in the first current acquisition unit 100 is connected with a second pole of a third switching tube Q3 in the first EFUSE unit 200; the second pole of the third switching tube Q3 in the second EFUSE unit 200 is connected with the other end of the sampling resistor Rs in the first current acquisition unit 100, and the third pole of the third switching tube Q3 in the second EFUSE unit 200 is connected with the positive input/output end PACK+; a third pole of a third switch tube Q3 in the third EFUSE unit 200 is connected with a negative pole of the battery pack Vcc; one end of a sampling resistor Rs in the second current acquisition unit 100 is connected with a second pole of a third switching tube Q3 in the third EFUSE unit 200; the second pole of the third switching tube Q3 in the fourth EFUSE unit 200 is connected to the other end of the sampling resistor Rs in the second current collecting unit 1002 and the second pole of the second switching tube Q2, respectively, and the third pole of the third switching tube Q3 in the fourth EFUSE unit 200 is connected to the negative input/output terminal PACK-.
Specifically, as shown in fig. 2, 3 and 6, during discharging of the battery PACK, when the trigger signal is input to the input terminal of the photo coupler U1 in the first EFUSE unit 200, the output pin of the photo coupler U1 in the first EFUSE unit 200 outputs a high level to the first pole of the corresponding third switch tube Q3, at this time, the third switch tube Q3 in the first EFUSE unit 200 is turned on, and similarly, the trigger signal may be input to the input terminal of the photo coupler U1 in the fourth EFUSE unit 200, wherein, since the freewheel diode exists in the third switch tube Q3 in the second EFUSE unit 200 and the third switch tube Q3 in the third EFUSE unit 200, no control is needed, at this time, the positive pole of the battery set Vcc is turned on with the positive input/output terminal pack+, the negative pole of the battery set Vcc is turned on with the negative input/output terminal PACK-, and the positive input/output terminal pack+, and the negative input/output terminal pack+ are respectively connected with the positive input/output terminal PACK and the negative input/output terminal PACK. In the discharging process of the battery PACK, if the first current is greater than the first preset value, it indicates that the first current between the positive electrode of the battery PACK Vcc and the positive input/output end pack+ is too large, at this time, the photocoupler U1 in the first EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3, so as to control the corresponding third switching tube Q3 to be turned off, i.e., to control the connection between the positive electrode of the battery PACK Vcc and the positive input/output end pack+ to be disconnected, thereby effectively preventing the risk of circuit burnout caused by the too large first current. Similarly, if the second current is greater than the second preset value, it indicates that the second current between the negative electrode of the battery Vcc and the negative input/output terminal PACK-is too large, and at this time, the photocoupler U1 in the fourth EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3, so as to control the corresponding third switching tube Q3 to be turned off, i.e., to control the connection between the negative electrode of the battery Vcc and the negative input/output terminal PACK-to be disconnected, thereby effectively preventing the risk of circuit burnout caused by the too large second current.
Further, as shown in fig. 2, 3 and 6, during the charging process of the battery PACK, when the trigger signal is input to the input terminal of the photo coupler U1 in the second EFUSE unit 200, the output pin of the photo coupler U1 in the second EFUSE unit 200 outputs a high level to the first pole of the corresponding third switch tube Q3, at this time, the third switch tube Q3 in the second EFUSE unit 200 is turned on, and similarly, the trigger signal may be input to the input terminal of the photo coupler U1 in the third EFUSE unit 200, wherein, because of the freewheeling diode present in the third switch tube Q3 in the first EFUSE unit 200 and the third switch tube Q3 in the fourth EFUSE unit 200, no control is needed, at this time, the positive pole of the battery set Vcc is turned on with the positive input/output terminal pack+, the negative pole of the battery set Vcc is turned on with the negative input/output terminal PACK, and the positive input/output terminal pack+ is turned on with the negative input/output terminal PACK, respectively, and the positive input/output terminal PACK is connected with the negative input/output terminal PACK. In the charging process of the battery PACK, if the first current is greater than the first preset value, it indicates that the first current between the positive electrode of the battery PACK Vcc and the positive input/output end pack+ is too large, at this time, the photo coupler U1 in the second EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3, so as to control the corresponding third switching tube Q3 to be turned off, i.e., to control the connection between the positive electrode of the battery PACK Vcc and the positive input/output end pack+ to be disconnected, thereby effectively preventing the risk of circuit burnout caused by the too large first current. Similarly, if the second current is greater than the second preset value, it indicates that the first current between the negative electrode of the battery Vcc and the negative input/output terminal PACK-is too large, and at this time, the photocoupler U1 in the third EFUSE unit 200 may be controlled to output a low level to the first electrode of the corresponding third switching tube Q3, so as to control the corresponding third switching tube Q3 to be turned off, i.e., to control the connection between the negative electrode of the battery Vcc and the negative input/output terminal PACK-to be disconnected, thereby effectively preventing the risk of circuit burnout caused by the too large second current.
According to the HV-EFUSE system of the battery pack, the current value between the positive electrode input end and the negative electrode input end of the battery pack is collected through the current collection unit, the collected current value is compared with the preset value, and the battery pack is controlled to charge or discharge when the current value is larger than the preset value through the EFUSE unit, so that the charge and discharge of the battery pack can be controlled, and the safety shutdown of a battery pack loop can be realized.
The foregoing examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the foregoing examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made therein and are intended to be equivalent substitutes within the scope of the present invention.

Claims (7)

1. A HV-EFUSE system of a battery pack, where the HV-EFUSE system is correspondingly connected to the battery pack, the battery pack comprising: the battery pack, positive input/output end, negative input/output end, thermistor, precharge resistor, first switch tube and second switch tube, the anodal with precharge resistor's one end links to each other, precharge resistor's the other end with first switch tube's third pole links to each other, thermistor's one end with positive input/output end links to each other, thermistor's the other end with second switch tube's third pole links to each other, wherein, HV-EFUSE system includes:
two current collection units, wherein a first current collection unit is arranged between the positive electrode of the battery pack and the positive input/output end and is used for collecting a first current between the positive input/output end and the positive electrode of the battery pack, and a second current collection unit is arranged between the negative electrode of the battery pack and the negative input/output end and is used for collecting a second current between the negative input/output end and the negative electrode of the battery pack;
and N EFUSE units, wherein the first to i EFUSE units are arranged between the positive electrode of the battery pack and the positive input/output end and are used for controlling the positive input/output end to stop charging or discharging when the first current is larger than a first preset value, the i+1 to N EFUSE units are arranged between the negative electrode of the battery pack and the negative input/output end and are used for controlling the negative input/output end to stop charging or discharging when the second current is larger than a second preset value, wherein N is an integer larger than or equal to 2, and i is an integer larger than or equal to 1 and smaller than N.
2. The HV-EFUSE system of a battery pack according to claim 1, wherein the EFUSE unit includes:
the first input pin and the second input pin of the photoelectric coupler are respectively connected with the controller;
one end of the first capacitor is connected with a first power pin of the photoelectric coupler, and the other end of the first capacitor is connected with a second power pin of the photoelectric coupler;
one end of the second capacitor is connected with one end of the first capacitor, and the other end of the second capacitor is connected with the other end of the first capacitor;
the positive electrode of the voltage source is connected with one end of the second capacitor, and the negative electrode of the voltage source is connected with the other end of the second capacitor;
one end of the first resistor is connected with an output pin of the photoelectric coupler;
one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected with the negative electrode of the voltage source;
and the first pole of the third switching tube is connected with the other end of the first resistor, and the second pole of the third switching tube is connected with the other end of the second resistor.
3. The HV-EFUSE system of a battery pack according to claim 1, wherein the current collection unit includes:
sampling a resistor;
an isolation amplifier;
one end of the third resistor is connected with one end of the sampling resistor, and the other end of the third resistor is connected with the first input end of the isolation amplifier;
one end of the fourth resistor is connected with the other end of the sampling resistor, and the other end of the fourth resistor is connected with the second input end of the isolation amplifier;
the third capacitor is connected with the other end of the third resistor, and the other end of the third capacitor is respectively connected with the first grounding end of the isolation amplifier and one end of the third resistor;
one end of the fourth capacitor is connected with the other end of the third resistor, and the other end of the fourth capacitor is connected with the other end of the fourth resistor;
one end of the fifth capacitor is connected with the first grounding end of the isolation amplifier, and the other end of the fifth capacitor is connected with the other end of the fourth resistor;
one end of the sixth capacitor is connected with the first power supply end of the isolation amplifier, and the other end of the sixth capacitor is grounded;
one end of the fifth resistor is connected with the first output end of the isolation amplifier, and the other end of the fifth resistor is connected with the controller;
one end of the sixth resistor is connected with the second output end of the isolation amplifier, and the other end of the sixth resistor is connected with the controller;
one end of the seventh capacitor is connected with the other end of the fifth resistor, and the other end of the seventh capacitor is connected with the other end of the sixth resistor;
and one end of the eighth capacitor is connected with the second power supply end of the isolation amplifier, and the other end of the eighth capacitor is grounded.
4. The HV-EFUSE system of a battery pack according to claim 1, wherein N is equal to 4, i is equal to 2, wherein,
a third pole of the third switching tube in the first EFUSE unit is connected with the positive pole of the battery pack, and a second pole of the third switching tube in the first EFUSE unit is connected with a second pole of the first switching tube;
one end of a sampling resistor in a first current acquisition unit is connected with a second pole of the third switching tube in the first EFUSE unit;
the second pole of the third switching tube in the second EFUSE unit is connected with the other end of the sampling resistor in the first current acquisition unit, and the third pole of the third switching tube in the second EFUSE unit is connected with the positive input/output end;
a third pole of the third switch tube in a third EFUSE unit is connected with the negative pole of the battery pack;
one end of a sampling resistor in a second current acquisition unit is connected with a second pole of the third switching tube in a third EFUSE unit;
and a second pole of the third switching tube in the fourth EFUSE unit is respectively connected with the other end of the sampling resistor in the second current acquisition unit and the second pole of the second switching tube, and a third pole of the third switching tube in the fourth EFUSE unit is connected with a negative input/output end.
5. The HV-EFUSE system of a battery pack according to claim 1, wherein N is equal to 2, i is equal to 1, wherein,
a third pole of the third switching tube in the first EFUSE unit is connected with the positive pole of the battery pack, and a second pole of the third switching tube in the first EFUSE unit is connected with a second pole of the first switching tube;
one end of a sampling resistor in a first current acquisition unit is connected with a second pole of the third switching tube in the first EFUSE unit, and the other end of the sampling resistor in the first current acquisition unit is connected with the positive input/output end;
one end of a sampling resistor in the second current acquisition unit is connected with the negative electrode of the battery pack;
and a second pole of the third switching tube in the second EFUSE unit is respectively connected with the other end of the sampling resistor in the second current acquisition unit and the second pole of the second switching tube, and a third pole of the third switching tube in the second EFUSE unit is connected with a negative input/output end.
6. The HV-EFUSE system of the battery pack of claim 1, wherein N is equal to 3,i equal to 1, wherein,
a third pole of the third switching tube in the first EFUSE unit is connected with the positive pole of the battery pack, and a second pole of the third switching tube in the first EFUSE unit is connected with a second pole of the first switching tube;
one end of a sampling resistor in a first current acquisition unit is connected with a second pole of the third switching tube in the first EFUSE unit, and the other end of the sampling resistor in the first current acquisition unit is connected with the positive input/output end;
a third pole of the third switch tube in the second EFUSE unit is connected with the negative pole of the battery pack;
one end of a sampling resistor in a second current acquisition unit is connected with a second pole of the third switching tube in a third EFUSE unit;
and a second pole of the third switching tube in the third EFUSE unit is respectively connected with the other end of the sampling resistor in the second current acquisition unit and the second pole of the second switching tube, and a third pole of the third switching tube in the third EFUSE unit is connected with a negative input/output end.
7. The HV-EFUSE system of a battery pack according to claim 1, characterized in that,
and freewheeling diodes are arranged in the first switching tube, the second switching tube and the third switching tube.
CN202310919884.XA 2023-07-25 HV-EFUSE system of battery pack Active CN116995623B (en)

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JP2000223164A (en) * 1999-01-29 2000-08-11 Ntt Docomo Inc Battery pack, and method and device for diagnosing capacity deterioration of same battery pack
KR100873016B1 (en) * 2007-06-26 2008-12-09 천창열 Battery management system for multi cell battery pack
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