CN114421554A - Lithium battery power supply system - Google Patents

Lithium battery power supply system Download PDF

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Publication number
CN114421554A
CN114421554A CN202111626155.2A CN202111626155A CN114421554A CN 114421554 A CN114421554 A CN 114421554A CN 202111626155 A CN202111626155 A CN 202111626155A CN 114421554 A CN114421554 A CN 114421554A
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CN
China
Prior art keywords
unit
lithium battery
supply system
power supply
current detection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111626155.2A
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Chinese (zh)
Inventor
施敏捷
姚帅
杨宝顺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Jk Energy Ltd
Original Assignee
Suzhou Jk Energy Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Jk Energy Ltd filed Critical Suzhou Jk Energy Ltd
Priority to CN202111626155.2A priority Critical patent/CN114421554A/en
Publication of CN114421554A publication Critical patent/CN114421554A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Protection Of Static Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application relates to the field of battery protection, concretely relates to lithium battery power supply system, include: the control module comprises a CPU unit, a current detection unit, a driving unit and a reset unit, wherein the current detection unit, the driving unit and the reset unit are respectively connected with the CPU unit; the current detection unit is connected with the current detection resistor and is used for detecting the current flowing through the current detection resistor; the driving unit is connected with the power assembly and used for controlling the power assembly to be opened and closed according to the current flowing through the current detection resistor; under the condition that the power assembly is disconnected due to overcurrent, the reset unit is used for periodically controlling the driving unit to close the power assembly through the CPU unit, and if the overcurrent does not appear in the power resistor, the lithium battery power supply system is reset. After the power assembly is disconnected due to overcurrent, the reset unit periodically controls the driving unit to close the power assembly through the CPU, and when the current detection unit does not detect that the overcurrent phenomenon occurs in the lithium battery power supply system, the lithium battery power supply system is reset.

Description

Lithium battery power supply system
Technical Field
The application relates to the field of battery protection, in particular to a lithium battery power supply system.
Background
The serious consequences of lithium batteries due to safety problems are generally caused by short circuits, and the heat generated by the short circuits causes the temperature to rise rapidly enough to melt general metals before the short circuits are broken, so that a fire is more likely to occur, and the property and life safety are threatened.
At present, the lithium battery short-circuit protection adopts a mode that a power loop is connected in series with a fuse, although the purpose of short-circuit protection can be achieved, the cost is high, in addition, the reaction time of the fuse is slow, and the short-circuit current generated before protection can damage the lithium battery. Once the fuse is disconnected, the fuse has the characteristic of being unrecoverable, and unpacking maintenance is required after protection, so that the cost is high.
Disclosure of Invention
Therefore, the present application is to solve the technical problem that the short-circuit protection cannot be automatically recovered in the lithium battery power supply system, so as to provide a lithium battery power supply system, which includes a lithium battery, a current detection resistor, a power module and a load unit connected in series, and further includes:
the control module comprises a CPU unit, a current detection unit, a driving unit and a reset unit, wherein the current detection unit, the driving unit and the reset unit are respectively connected with the CPU unit;
the current detection unit is connected with the current detection resistor and is used for detecting the current flowing through the current detection resistor; the driving unit is connected with the power assembly and used for controlling the power assembly to be opened and closed according to the current flowing through the current detection resistor;
and under the condition that the power assembly is disconnected due to overcurrent, the reset unit is used for periodically controlling the driving unit to close the power assembly through the CPU unit, and if the overcurrent does not appear in the power resistor, the lithium battery power supply system is reset.
Optionally, the reset unit comprises a reset capacitor for periodically closing the power component by controlling the CPU unit driving unit.
Optionally, the driving unit includes an on output terminal and an off output terminal, and the on output terminal and the off output terminal are respectively connected to the driving unit to control the turning off of the power component.
Optionally, the power component comprises a field effect transistor or an insulated gate bipolar transistor.
Optionally, the control module comprises a first setting unit for setting a current threshold.
Optionally, the control module comprises a second setting unit for setting a voltage threshold.
Optionally, the control module comprises an LTC7003 chip.
This application technical scheme has following advantage:
the application provides a lithium battery power supply system, whether appear overflowing among the current detection unit detection lithium battery power supply system, after the phenomenon that appears overflowing, the CPU unit in time controls drive unit disconnection power component to block lithium battery power supply system and continue output current, prevent to take place danger. After the power assembly is disconnected due to overcurrent, the reset unit periodically controls the driving unit to close the power assembly through the CPU, and when the current detection unit does not detect that the overcurrent phenomenon occurs in the lithium battery power supply system, the lithium battery power supply system is reset.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a lithium battery protection system according to embodiment 1 of the present application;
fig. 2 is a schematic diagram of an internal structure of a control module in embodiment 1 of the present application;
fig. 3 is a schematic structural diagram of an LTC7003 chip in embodiment 1 of the present application.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
The fuse can be connected in series in the lithium battery power supply system, and when a short circuit occurs, short-circuit protection is triggered to disconnect the fuse. However, after the fuse is disconnected, the lithium battery power supply system has the characteristic of being unrecoverable, manual unpacking maintenance is needed, and the cost is high.
Example 1
The present embodiment provides a lithium battery power supply system, as shown in fig. 1, including a lithium battery 102, a current detection resistor 103, a power component 104, and a load unit 105, which are connected in series, wherein the lithium battery 102, the current detection resistor 103, the power component 104, and the load unit 105 may be connected in series in sequence. The lithium battery power supply system may further include a control module 101. As shown in fig. 2, the control module 101 includes a CPU unit 1011, a current detection unit 1012, a reset unit 1013, and a drive unit 1014, and the current detection unit 1012, the reset unit 1013, and the drive unit 1014 are connected to the CPU unit 1011, respectively.
The current detection unit 1012 is connected to the current detection resistor 103 to detect a current flowing through the current detection resistor 103; the driving unit 1014 is connected to the power module 104, and is configured to control the power module 104 to open or close according to the detected current flowing through the current detecting resistor 103. For example, when the current detection unit 1012 detects that the current flowing through the current detection resistor 103 is the first current a, and the first current a is greater than the current threshold, the CPU 1011 controls the driving unit 1014 to turn off the power module 104, so as to block the lithium battery power supply system and prevent an accident. For another example, when the current detecting unit 1012 detects that the current flowing through the current detecting resistor 103 is the second current b, and the second current b is smaller than the current threshold, the CPU unit 1011 continues to control the driving unit 1014 to close the power module 104.
When the lithium battery power supply system is short-circuited and overcurrent occurs, the CPU unit 1011 controls the driving unit 1014 to turn off the power assembly 104. The reset unit 1013 periodically controls the driving unit 1014 to close the power components through the CPU unit 1011, and resets the lithium battery power supply system if the current detected by the current detection unit 1012 is less than the current threshold, which indicates that the lithium battery power supply system is not in an overcurrent condition.
In summary, the current detection unit 1012 detects whether an overcurrent occurs in the lithium battery power supply system, and after the overcurrent occurs, the CPU 1011 controls the driving unit 1014 to disconnect the power module 104 in time, so as to block the lithium battery power supply system from continuously outputting current, thereby preventing danger. After the power assembly 104 is disconnected due to overcurrent, the reset unit 1013 controls the driving unit 1014 to close the power assembly 104 periodically through the CPU unit, and resets the lithium battery power supply system when the current detection unit 1012 does not detect that the overcurrent phenomenon occurs in the lithium battery power supply system.
In one or more embodiments, the reset unit 1013 includes a reset capacitor (not shown), and the reset capacitor can periodically control the driving unit 1014 to close the power assembly 104 through the CPU unit 1011 to further detect whether the over-current phenomenon continues to exist in the lithium battery power supply system. It should be noted that the cycle refers to that the power module 104 under the attempt is closed every preset time by setting the preset time, and if no overcurrent occurs in the lithium battery power supply system, the lithium battery power supply system is reset; and if the lithium battery power supply system is found to be in overcurrent continuously, the power assembly 104 is controlled to be disconnected continuously. The preset time may be 1 minute, 3 minutes, 7 minutes, etc., and may be appropriately selected by those skilled in the art according to actual situations, which are not limited herein.
In one or more embodiments, the driving unit 1014 includes an on output and an off output, the power component 104 includes a field effect transistor (MOS transistor) or an Insulated Gate Bipolar Transistor (IGBT), and the on output and the off output of the driving unit 1014 are respectively connected with the field effect transistor or the insulated gate bipolar transistor to open/close the field effect transistor or the insulated gate bipolar transistor. For example, the turn-on output terminal and the turn-off output terminal of the driving unit 1014 are respectively connected to the gates of the fets to open/close the fets by driving the gates of the fets.
In one or more embodiments, as shown in fig. 2, a first setting unit 1015 and a second setting unit 1016 are further included, the first setting unit 1015 is used for setting the current threshold, and the second setting unit 1016 is used for setting the voltage threshold. The current detected by the current detection unit 1012 is compared with a current threshold to determine whether the power component 104 needs to be turned off; the voltage threshold is used to compare with the operating voltage of the control module 101 to determine whether the power component 104 needs to be turned off.
In one or more embodiments, the current detection unit 1012 includes a current positive input terminal and a current negative input terminal, which are respectively connected to two ends of the current detection resistor 103. The current flowing through the current detection resistor 103 causes a voltage drop across the current detection resistor 103, and the current flowing through the current detection resistor 103 is determined by the voltage drop across the current detection resistor 103.
In one or more embodiments, the control module comprises an LTC7003 chip. As shown in fig. 3, the first terminal 201 and the second terminal 202 of the LTC7003 chip are power input pins, which are respectively connected to a power supply (not shown), so as to ensure that the voltage of the LTC7003 chip is in an operating voltage range; the third end 203 of the LTC7003 chip is an overcurrent fault state feedback pin, and when the overcurrent phenomenon of the lithium battery power supply system is detected, the overcurrent state is fed back and output; the fourth terminal 204 and the fifth terminal 205 of the LTC7003 chip are automatic reset pins connected to a reset capacitor, so as to form the reset unit. The sixth end 206 and the twelfth end 212 of the LTC7003 chip are setting pins for setting a voltage threshold and a current threshold, respectively, which are the first setting unit and the second setting unit; the seventh end 207 and the eighth end 208 of the LTC7003 chip are resistance input pins, that is, the current detection unit 1012 includes a current positive input end and a current negative input end, and is connected to the current detection resistor 103; the ninth terminal 209 and the tenth terminal 210 of the LTC7003 chip are control output terminals, i.e., the on output terminal and the off output terminal of the driving unit 1014, and are connected to the power module 104; the tenth end of the LTC7003 chip is a differential output end, which is a voltage differential signal output end at two ends of the current detection resistor 103.
An LTC7003 chip is used as a control module, and a pure hardware lithium battery output short circuit protection function can be realized by matching an external power component 104 and a current detection resistor 103; the defects of high cost, low reliability and unrecoverability of the traditional fuse scheme are overcome. The lithium battery power supply system has the advantages of simplicity, low cost, quick short circuit reaction, high reliability, automatic recovery and no need of maintenance, and is very suitable for the application of lithium battery short circuit protection.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of this invention are intended to be covered by the scope of the invention as expressed herein.

Claims (7)

1. The utility model provides a lithium battery power supply system, includes lithium cell, current detection resistance, power module and the load unit of establishing ties, its characterized in that still includes:
the control module comprises a CPU unit, a current detection unit, a driving unit and a reset unit, wherein the current detection unit, the driving unit and the reset unit are respectively connected with the CPU unit;
the current detection unit is connected with the current detection resistor and is used for detecting the current flowing through the current detection resistor; the driving unit is connected with the power assembly and used for controlling the power assembly to be opened and closed according to the current flowing through the current detection resistor;
and under the condition that the power assembly is disconnected due to overcurrent, the reset unit is used for periodically controlling the driving unit to close the power assembly through the CPU unit, and if the overcurrent does not appear in the power resistor, the lithium battery power supply system is reset.
2. The lithium battery power supply system of claim 1, wherein the reset unit includes a reset capacitor for periodically closing the power assembly by controlling the CPU unit drive unit.
3. The lithium battery power supply system of claim 1, wherein the driving unit includes an on output and an off output, the on and off outputs being respectively connected to the driving unit to control the turning off of the power assembly.
4. The lithium battery power supply system of claim 3, wherein the power component comprises a field effect transistor or an insulated gate bipolar transistor.
5. The lithium battery power supply system of claim 1, wherein the control module includes a first setting unit for setting a current threshold.
6. The lithium battery power supply system of claim 1, wherein the control module includes a second setting unit for setting a voltage threshold.
7. The lithium battery power supply system of any one of claims 1-6, wherein the control module comprises an LTC7003 chip.
CN202111626155.2A 2021-12-28 2021-12-28 Lithium battery power supply system Pending CN114421554A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111626155.2A CN114421554A (en) 2021-12-28 2021-12-28 Lithium battery power supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111626155.2A CN114421554A (en) 2021-12-28 2021-12-28 Lithium battery power supply system

Publications (1)

Publication Number Publication Date
CN114421554A true CN114421554A (en) 2022-04-29

Family

ID=81269362

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111626155.2A Pending CN114421554A (en) 2021-12-28 2021-12-28 Lithium battery power supply system

Country Status (1)

Country Link
CN (1) CN114421554A (en)

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Address after: 215129 West of Building 28, No. 2, Mount Taishan Road, Suzhou High tech Zone, Suzhou, Jiangsu Province

Applicant after: Suzhou Jingkong Energy Technology Co.,Ltd.

Address before: 215129 West, building 28, Hefeng Industrial Park, No.2, Taishan Road, high tech Zone, Suzhou City, Jiangsu Province

Applicant before: SUZHOU JK ENERGY Ltd.

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