CN113067381A - Multi-lithium battery protection system - Google Patents
Multi-lithium battery protection system Download PDFInfo
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- CN113067381A CN113067381A CN202110328255.0A CN202110328255A CN113067381A CN 113067381 A CN113067381 A CN 113067381A CN 202110328255 A CN202110328255 A CN 202110328255A CN 113067381 A CN113067381 A CN 113067381A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 134
- 238000001514 detection method Methods 0.000 claims abstract description 149
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 126
- 238000004891 communication Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000733 Li alloy Inorganic materials 0.000 description 1
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- 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
- H02J7/00308—Overvoltage 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
- H02J7/00309—Overheat or overtemperature 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a multi-section lithium battery protection system, which comprises N sections of lithium batteries, a temperature acquisition module, a control module and a detection module, wherein each section of lithium battery and each control module are correspondingly connected with each temperature acquisition module one by one, the control module is connected with the N sections of lithium batteries and the temperature acquisition module, the detection module comprises an overvoltage detection unit, an over-temperature detection unit and an over-current detection unit which are provided with N input ports, the control module comprises N main control chips connected with two ends of each section of lithium battery, each main control chip is respectively connected with the input ports corresponding to the overvoltage detection unit, the over-temperature detection unit and the over-current detection unit, N is an integer more than or equal to 3, the control module is used for carrying out real-time signal collection on the lithium batteries and outputting corresponding electric signals to the detection module, the detection module receives and processes the electric signals, the working stability of the lithium battery in the charge and discharge circuit can be effectively improved.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a protection system for multiple lithium batteries.
Background
The lithium battery has the advantages of small volume, high energy density, no memory effect, high voltage, low self-discharge rate and the like, and can be applied to a plurality of electronic devices, such as mobile phones, electric vehicles, Bluetooth devices and the like, and the lithium battery is used as a main power supply.
The management system and the protection device of the lithium ion battery on the market generally have two modes, one mode is a digital battery management system based on battery management chips produced by companies such as TI and Mellin, although the digital battery management system has strong functions, the technology is complex, the price is high, and the wide application in practice is restricted. The other type is a lithium ion battery protection plate based on a battery protection chip, and has a basic function. However, no system has protection on the battery such as voltage, current and over-temperature, which causes the battery to generate over-temperature, over-current and over-voltage problems.
Disclosure of Invention
In view of this, the present invention provides a protection system for multiple lithium batteries with overvoltage protection, overcurrent protection, and over-temperature protection, so as to solve the above technical problems, and the protection system is specifically implemented by using the following technical solutions.
The invention provides a multi-lithium battery protection system which comprises N lithium batteries, temperature acquisition modules, a control module and a detection module, wherein each lithium battery and each control module are correspondingly connected with each temperature acquisition module one by one, the control module is connected with the N lithium batteries and the temperature acquisition modules, the detection module comprises an overvoltage detection unit with N input ports, an over-temperature detection unit with N input ports and an over-current detection unit with N input ports, the control module comprises N main control chips connected to two ends of each lithium battery, each main control chip is respectively connected with the overvoltage detection unit, the over-temperature detection unit and the input ports corresponding to the over-current detection unit, N is an integer greater than or equal to 3, and each lithium battery is connected in series;
the control module is used for right the lithium cell carries out real-time signal collection and output corresponding signal of telecommunication extremely detection module, detection module is used for receiving the signal of telecommunication is handled, real-time signal includes temperature acquisition module is used for gathering the real-time temperature of lithium cell control module collects the voltage signal or the current signal of lithium cell.
As a further improvement of the above technical solution, when N is 3, the N lithium batteries include a first lithium battery, a second lithium battery and a third lithium battery connected in series, the control module includes a first main control chip, a second main control chip and a third main control chip connected in parallel, and the temperature acquisition module includes a first temperature acquisition circuit, a second temperature acquisition circuit and a third temperature acquisition circuit connected in parallel;
the first lithium battery and the first main control chip are connected with the first temperature acquisition circuit, the first lithium battery is connected with the input end of the first main control chip and the grounding end of the first main control chip, a first input port of the overvoltage detection unit is connected with a first output port of the first main control chip, a first input port of the over-temperature detection unit is connected with a second output port of the first main control chip, and a first input port of the over-current detection unit is connected with a third output port of the first main control chip;
the second lithium battery and the second main control chip are connected with the second temperature acquisition circuit, the second lithium battery is connected with the input end of the second main control chip and the grounding end of the second main control chip, a second input port of the overvoltage detection unit is connected with a first output port of the second main control chip, a second input port of the over-temperature detection unit is connected with a second output port of the second main control chip, and a second input port of the over-current detection unit is connected with a third output port of the second main control chip;
the third lithium battery, the third main control chip and the third temperature acquisition circuit are connected, the third lithium battery is connected with the input end of the third main control chip and the output end of the third main control chip, a third input port of the overvoltage detection unit is connected with a first output port of the third main control chip, a third input port of the over-temperature detection unit is connected with a second output port of the third main control chip, and a third input port of the over-current detection unit is connected with a third output port of the third main control chip.
As a further improvement of the above technical solution, the first temperature acquisition circuit includes a first thermocouple, a first resistor, a first triode, a first diode, and a second resistor, the first thermocouple is connected to the first lithium battery and the first resistor, the first resistor is connected to the base of the first triode, the collector of the first triode is connected to the cathode of the first diode, the emitter of the first triode is grounded, and the anode of the first triode is connected to the second resistor;
the second temperature acquisition circuit comprises a second thermocouple, a third resistor, a second triode, a second diode and a fourth resistor, the second thermocouple is connected with the second lithium battery and the third resistor, the third resistor is connected with the base electrode of the second triode, the collector electrode of the second triode is connected with the cathode of the second diode, the emitter electrode of the second triode is grounded, and the anode of the second triode is connected with the fourth resistor;
the third temperature acquisition circuit comprises a third thermocouple, a fifth resistor, a third triode, a third diode and a sixth resistor, the third thermocouple is connected with a third lithium battery and the fifth resistor, the fifth resistor is connected with the base of a third triode, the collector of the third triode is connected with the cathode of the third diode, the emitter of the third triode is grounded, and the anode of the third triode is connected with the sixth resistor.
As a further improvement of the above technical solution, the overvoltage detection unit includes a first voltage detection circuit, a second voltage detection circuit, and a third voltage detection circuit, and the first voltage detection circuit, the second voltage detection circuit, and the third voltage detection circuit are correspondingly connected to each input port of the overvoltage detection unit;
the first voltage detection circuit comprises a seventh resistor, a first switching tube, a fourth diode, a fifth diode, a fourth triode and an eighth resistor, wherein the seventh resistor is connected with the grid electrode of the first switching tube, the source electrode of the first switching tube is connected with the anode of the fourth diode, the cathode of the fourth diode and the cathode of the fifth diode are connected with the base electrode of the fourth triode, the emitter electrode of the fourth triode is connected with the anode of the fifth diode, and the collector electrode of the fourth triode is connected with the eighth resistor;
the second voltage detection circuit comprises a ninth resistor, a second switching tube, a sixth diode, a seventh diode, a fifth triode and a tenth resistor, wherein the ninth resistor is connected with the grid electrode of the second switching tube, the source electrode of the second switching tube is connected with the anode of the sixth diode, the cathode of the sixth diode and the cathode of the seventh diode are connected with the base electrode of the fifth triode, the emitter electrode of the fifth triode is connected with the anode of the seventh diode, and the collector electrode of the fifth triode is connected with the tenth resistor;
the third voltage detection circuit comprises an eleventh resistor, a third switching tube, an eighth diode, a ninth diode, a sixth triode and a twelfth resistor, wherein the eleventh resistor is connected with the grid electrode of the third switching tube, the source electrode of the third switching tube is connected with the anode of the eighth diode, the cathode of the eighth diode and the cathode of the ninth diode are connected with the base electrode of the sixth triode, the emitter electrode of the sixth triode is connected with the anode of the ninth diode, and the collector electrode of the sixth triode is connected with the twelfth resistor.
As a further improvement of the above technical solution, the first switching tube, the second switching tube and the third switching tube are MOS tubes, and the fourth triode, the fifth triode and the sixth triode are amplifying triodes.
As a further improvement of the above technical solution, the multiple lithium battery protection system further includes:
the three communication buses are respectively connected with the overvoltage detection circuit, the over-temperature protection circuit and the overcurrent protection circuit and are used for transmitting the real-time signals;
and the display module is connected with the three communication buses and is used for displaying the real-time signals.
As a further improvement of the above technical solution, the display module includes:
the judging unit is connected with the communication bus and used for judging whether the real-time signal exceeds a preset threshold value and generating a detection result;
and the adjusting unit is connected with the judging unit and used for adjusting the circuit where the lithium battery is located according to the detection result.
The invention provides a protection system for a plurality of lithium batteries, which has the following beneficial effects:
(1) through connecting lithium cell and temperature acquisition module, control module, can detect the temperature of lithium cell in real time, be connected control module with excessive pressure detecting element, excess temperature detecting element and overcurrent detecting element respectively, can effectively protect lithium cell or the circuit condition that lithium cell is located.
(2) The overvoltage detection unit, the overcurrent detection unit and the overtemperature detection unit are connected to the output end of each main control chip, the number of output ports of the overvoltage detection unit, the overcurrent detection unit and the overtemperature detection unit can be set according to the number of the lithium batteries, circuit design is simplified, and applicability is high.
(3) By adopting an integrated system of overvoltage protection, overcurrent protection and overtemperature protection, the working stability of the lithium battery in the charge-discharge circuit can be effectively improved, and meanwhile, the lithium battery charging and discharging system is low in cost and easy to popularize on a large scale.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a block diagram of a protection system for multiple lithium batteries according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a protection system for multiple lithium batteries according to an embodiment of the present invention;
FIG. 3 is a block diagram of a display module according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a temperature acquisition module according to an embodiment of the present invention;
fig. 5 is a circuit diagram of an over-voltage detection unit according to an embodiment of the present invention.
Description of the main element symbols:
100-a multi-lithium battery protection system; 110-a lithium battery; 120-temperature acquisition module; 130-a control module; 140-a detection module; 150-an over-temperature detection unit; 160-overvoltage detection unit; 170-over-current detection unit; 180-a first section of lithium battery; 181-second section of lithium battery; 182-third lithium battery; 183-first master control chip; 184-a second master control chip; 185-a third main control chip; 193-first temperature acquisition circuitry; 194-a second temperature acquisition circuit; 195-a third temperature acquisition circuit; 196-a first voltage detection circuit; 197-a second voltage detection circuit; 198-a third voltage detection circuit; 200-a multi-lithium battery protection system; 210-a communication bus; 220-a display module; 230-a judging unit; 240-adjustment unit.
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 or similar 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.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; 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.
Referring to fig. 1 and 2, the present invention provides a multi-lithium battery protection system 100, including N lithium batteries 110, a temperature acquisition module 120, a control module 130, and a detection module 140, wherein each lithium battery 110, each control module 130, and each temperature acquisition module 120 are connected in a one-to-one correspondence, the control module 130 is connected to the N lithium batteries 110, and the temperature acquisition module 120, the detection module 140 includes an overvoltage detection unit 160 with N input ports, an over-temperature detection unit 150 with N input ports, and an over-current detection unit 170 with N input ports, the control module 130 includes N main control chips connected to two ends of each lithium battery 110, each main control chip is respectively connected to the input ports corresponding to the overvoltage detection unit 160, the over-temperature detection unit 150, and the over-current detection unit 170, where N is an integer greater than or equal to 3, each of the lithium batteries 110 is connected in series;
the control module 130 is configured to collect real-time signals of the lithium battery 110 and output corresponding electrical signals to the detection module 140, the detection module 140 is configured to receive the electrical signals for processing, the real-time signals include a temperature acquisition module 120 configured to acquire real-time temperatures of the lithium battery 110, and the control module 130 collects voltage signals or current signals of the lithium battery 110.
In this embodiment, the lithium battery is a battery using a non-aqueous electrolyte solution and using lithium metal or a lithium alloy as a positive-negative electrode material, and the lithium battery generally has two shapes: cylindrical and square, the inside of the battery adopts a spiral winding structure, and the battery is formed by spacing a very fine and high-permeability polyethylene film isolating material between the positive electrode and the negative electrode. The positive electrode comprises a current collector consisting of lithium cobaltate (or lithium nickel cobalt manganese oxide, lithium manganate, lithium iron phosphate and the like) and an aluminum foil. The negative electrode is composed of a current collector composed of a graphitized carbon material and a copper foil, and an organic electrolyte solution is filled in the battery. In addition, a safety valve and a PTC element (partially cylindrical) are provided to protect the battery from damage in case of abnormal state and output short circuit. The voltage of a single lithium battery is 3.7V (3.2V for the positive electrode of lithium iron phosphate), the battery capacity cannot be infinite, and the single lithium battery is often subjected to series and parallel connection to meet the requirements of different occasions. The temperature acquisition module can be that temperature sensor is connected with every section lithium cell, a temperature condition for gather the lithium cell in real time and insert the circuit, control module is connected to temperature detection module and lithium cell, control module promptly, temperature acquisition module and lithium cell one-to-one set up, control module is control chip such as MCU, overvoltage detecting element, the input port quantity of excess temperature detecting element and overcurrent detecting element is the same with the quantity of the lithium cell of inserting, and overvoltage detecting element, the quantity of excess temperature detecting element and overcurrent detecting element is one respectively, carry out the excessive pressure to every section lithium cell on the circuit, excess temperature and overcurrent real-time detection and provide the protection, the circuit design has been simplified, the job stabilization nature of multisection lithium cell circuit has been improved.
It should be noted that the reasons for generating the overcurrent include an overload current and a short-circuit current, and the overload current means that the electric circuit is overloaded due to the overload of the connected electric equipment or the overload of the supplied equipment, such as the overload of the mechanical load of the connected motor. The short-circuit current means that when the loop insulation is damaged due to various reasons including overload, conductors with unequal potentials are conducted through fault points with negligible impedance, all the short-circuit loop paths are metal paths, the short-circuit current value can reach hundreds to thousands of times of the current-carrying capacity of the loop conductors, and abnormal high temperature or huge mechanical stress can be generated to cause various disasters. Sudden changes in the state of the electrical circuit and the state of the electromagnetic in the power system are the root cause of the generation of overvoltages. The overvoltage is divided into two categories, external overvoltage and internal overvoltage. The premise of determining the insulation matching of the power system is to study the causes of various overvoltage in the power system and take measures to limit the causes.
When N is 3, the N lithium batteries 110 include a first lithium battery 180, a second lithium battery 181 and a third lithium battery 182 which are connected in series, the control module 130 includes a first main control chip 183, a second main control chip 184 and a third main control chip 185 which are connected in parallel, and the temperature acquisition module 120 includes a first temperature acquisition circuit 193, a second temperature acquisition circuit 194 and a third temperature acquisition circuit 195 which are connected in parallel;
the first lithium battery 180 and the first main control chip 183 are connected to the first temperature acquisition circuit 193, the first lithium battery 180 is connected to an input end of the first main control chip 183 and a ground end of the first main control chip 183, a first input port of the overvoltage detection unit 160 is connected to a first output port of the first main control chip 183, a first input port of the over-temperature detection unit 150 is connected to a second output port of the first main control chip 183, and a first input port of the over-current detection unit 170 is connected to a third output port of the first main control chip 183;
the second lithium battery 181 and the second main control chip 184 are connected to the second temperature acquisition circuit 194, the second lithium battery 181 is connected to an input end of the second main control chip 184 and a ground end of the second main control chip 184, a second input port of the overvoltage detection unit 160 is connected to a first output port of the second main control chip 184, a second input port of the over-temperature detection unit 150 is connected to a second output port of the second main control chip 184, and a second input port of the over-current detection unit 170 is connected to a third output port of the second main control chip 184;
the third lithium battery 182 and the third main control chip 185 are connected to the third temperature acquisition circuit, the third lithium battery is connected to the input terminal of the third main control chip and the output terminal of the third main control chip 185, the third input port of the overvoltage detection unit 160 is connected to the first output port of the third main control chip 185, the third input port of the over-temperature detection unit 150 is connected to the second output port of the third main control chip 185, and the third input port of the over-current detection unit 170 is connected to the third output port of the third main control chip 185.
It should be understood that, control module is through carrying out real-time signal collection and output corresponding signal of telecommunication to detection module to the lithium cell, detection module receives the signal of telecommunication and handles, this real-time signal includes the real-time temperature that the lithium cell was gathered to the temperature acquisition module, when judging the real-time temperature on the circuit and surpassing the preset temperature, control module collects the voltage or the current signal of lithium cell, protect through the voltage or the electric current in overtemperature detection unit, overcurrent detection unit and the excessive pressure detecting element circuit, for example, divide voltage or reposition of redundant personnel, can realize the normal charge or the discharge process of lithium cell.
Referring to fig. 4, optionally, the first temperature acquisition circuit 193 includes a first thermocouple, a first resistor R1, a first transistor B1, a first diode D1 and a second resistor R2, the first thermocouple is connected to the first lithium battery K1 and the first resistor, the first resistor is connected to the base of the first triode, the collector of the first triode is connected to the cathode of the first diode, the emitter of the first triode is grounded, and the anode of the first triode is connected to the second resistor;
the second temperature acquisition circuit 194 comprises a second thermocouple, a third resistor R3, a second triode B2, a second diode D2 and a fourth resistor R4, the second thermocouple is connected with the second lithium battery and the third resistor, the third resistor is connected with the base of the second triode, the collector of the second triode is connected with the cathode of the second diode, the emitter of the second triode is grounded, and the anode of the second triode is connected with the fourth resistor;
the third temperature collecting circuit 195 includes a third thermocouple, a fifth resistor R5, a third triode B3, a third diode D3 and a sixth resistor R6, the third thermocouple with the third lithium battery the fifth resistor is connected, the fifth resistor is connected with the base of the third triode, the collector of the third triode is connected with the cathode of the third diode, the emitter of the third triode is grounded, and the anode of the third triode is connected with the sixth resistor.
In this embodiment, the thermocouple is a commonly used measuring element in the temperature measuring meter, directly measures the temperature, converts the temperature signal into a thermal electromotive force signal, and converts the thermal electromotive force signal into the temperature of the measured medium through the electric meter. The thermocouples are physically connected with the corresponding lithium batteries and used for detecting the temperature of the batteries in real time and outputting detection current. Each resistor is a voltage stabilizing resistor, and the triode is used for amplifying output current so as to improve the detection accuracy of each lithium battery.
Optionally, referring to fig. 5, the overvoltage detection unit 160 includes a first voltage detection circuit 196, a second voltage detection circuit 197, and a third voltage detection circuit 198, where the first voltage detection circuit 196, the second voltage detection circuit 197, and the third voltage detection circuit 198 are correspondingly connected to each input port of the overvoltage detection unit 190;
the first voltage detection circuit 196 includes a seventh resistor R7, a first switch transistor M1, a fourth diode D4, a fifth diode D5, a fourth triode B4 and an eighth resistor R8, the seventh resistor is connected to a gate of the first switch transistor, a source of the first switch transistor is connected to an anode of the fourth diode, a cathode of the fourth diode and a cathode of the fifth diode are connected to a base of the fourth triode, an emitter of the fourth triode is connected to an anode of the fifth diode, and a collector of the fourth triode is connected to the eighth resistor;
the second voltage detection circuit 197 includes a ninth resistor R9, a second switch transistor M2, a sixth diode D6, a seventh diode D7, a fifth transistor B5 and a tenth resistor R10, wherein the ninth resistor is connected to the gate of the second switch transistor, the source of the second switch transistor is connected to the anode of the sixth diode, the cathode of the sixth diode and the cathode of the seventh diode are connected to the base of the fifth transistor, the emitter of the fifth transistor is connected to the anode of the seventh diode, and the collector of the fifth transistor is connected to the tenth resistor;
the third voltage detection circuit 198 includes an eleventh resistor R11, a third switching tube M3, an eighth diode D8, a ninth diode R9, a sixth triode B6 and a twelfth resistor R12, the eleventh resistor is connected to the gate of the third switching tube, the source of the third switching tube is connected to the anode of the eighth diode, the cathode of the eighth diode and the cathode of the ninth diode are connected to the base of the sixth triode, the emitter of the sixth triode is connected to the anode of the ninth diode, and the collector of the sixth triode is connected to the twelfth resistor.
In this embodiment, the first voltage detection circuit, the second voltage detection circuit and the third voltage detection circuit have the same circuit structure diagram, each voltage detection circuit is composed of two voltage stabilization resistors, and the principles of the overvoltage detection circuit, the overcurrent detection circuit and the overtemperature detection circuit are the same. The first switching tube, the second switching tube and the third switching tube are MOS tubes, and the fourth triode, the fifth triode and the sixth triode are amplifying triodes, so that overvoltage detection and protection of the circuit are realized.
Optionally, referring to fig. 2 and fig. 3, the multiple lithium battery protection system 200 further includes:
three communication buses 210 respectively connected to the overvoltage detection circuit, the over-temperature protection circuit and the overcurrent protection circuit, for transmitting the real-time signal;
and a display module 220 connected to the three communication buses and configured to display the real-time signal.
In this embodiment, the display module 220 includes a determining module 230 and an adjusting module 240, the determining module is connected to the communication bus and configured to determine whether the real-time signal exceeds a preset threshold and generate a detection result, and the adjusting module is connected to the determining unit and configured to adjust a circuit where the lithium battery is located according to the detection result. The display module can be a display screen, and the communication bus can be an RS485 bus. When the real-time signal is judged to exceed the preset threshold value, a detection result is generated, and the adjusting unit adjusts a circuit where the lithium battery is located according to the detection result, such as the adjustment of input voltage or the adjustment of output current is needed when overvoltage and overcurrent occur. To improve the operational stability of the circuit.
According to the protection system for the multiple lithium batteries, the lithium batteries are connected with the temperature acquisition module and the control module, so that the temperature of the lithium batteries can be detected in real time, and the control module is respectively connected with the overvoltage detection unit, the over-temperature detection unit and the over-current detection unit, so that the lithium batteries or circuits where the lithium batteries are located can be effectively protected under abnormal conditions. The overvoltage detection unit, the overcurrent detection unit and the overtemperature detection unit are connected to the output end of each main control chip, the number of output ports of the overvoltage detection unit, the overcurrent detection unit and the overtemperature detection unit can be set according to the number of the lithium batteries, circuit design is simplified, and applicability is high. By adopting an integrated system of overvoltage protection, overcurrent protection and overtemperature protection, the working stability of the lithium battery in the charge-discharge circuit can be effectively improved, and meanwhile, the lithium battery charging and discharging system is low in cost and easy to popularize on a large scale.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. A multi-lithium battery protection system is characterized by comprising N lithium batteries, temperature acquisition modules, control modules and detection modules, wherein each lithium battery and each control module are correspondingly connected with each temperature acquisition module one by one, the control modules are connected with the N lithium batteries and the temperature acquisition modules, each detection module comprises an overvoltage detection unit with N input ports, an over-temperature detection unit with N input ports and an overcurrent detection unit with N input ports, each control module comprises N main control chips connected to two ends of each lithium battery, each main control chip is respectively connected with the overvoltage detection unit, the over-temperature detection unit and the input ports corresponding to the overcurrent detection units, N is an integer greater than or equal to 3, and each lithium battery is connected in series;
the control module is used for right the lithium cell carries out real-time signal collection and output corresponding signal of telecommunication extremely detection module, detection module is used for receiving the signal of telecommunication is handled, real-time signal includes temperature acquisition module is used for gathering the real-time temperature of lithium cell control module collects the voltage signal or the current signal of lithium cell.
2. The protection system for multiple lithium batteries according to claim 1, wherein when N is 3, the N lithium batteries include a first lithium battery, a second lithium battery and a third lithium battery connected in series, the control module includes a first main control chip, a second main control chip and a third main control chip connected in parallel, and the temperature acquisition module includes a first temperature acquisition circuit, a second temperature acquisition circuit and a third temperature acquisition circuit connected in parallel;
the first lithium battery and the first main control chip are connected with the first temperature acquisition circuit, the first lithium battery is connected with the input end of the first main control chip and the grounding end of the first main control chip, a first input port of the overvoltage detection unit is connected with a first output port of the first main control chip, a first input port of the over-temperature detection unit is connected with a second output port of the first main control chip, and a first input port of the over-current detection unit is connected with a third output port of the first main control chip;
the second lithium battery and the second main control chip are connected with the second temperature acquisition circuit, the second lithium battery is connected with the input end of the second main control chip and the grounding end of the second main control chip, a second input port of the overvoltage detection unit is connected with a first output port of the second main control chip, a second input port of the over-temperature detection unit is connected with a second output port of the second main control chip, and a second input port of the over-current detection unit is connected with a third output port of the second main control chip;
the third lithium battery, the third main control chip and the third temperature acquisition circuit are connected, the third lithium battery is connected with the input end of the third main control chip and the output end of the third main control chip, a third input port of the overvoltage detection unit is connected with a first output port of the third main control chip, a third input port of the over-temperature detection unit is connected with a second output port of the third main control chip, and a third input port of the over-current detection unit is connected with a third output port of the third main control chip.
3. The protection system for multiple lithium batteries according to claim 2, wherein said first temperature acquisition circuit comprises a first thermocouple, a first resistor, a first triode, a first diode and a second resistor, said first thermocouple is connected to said first lithium battery and said first resistor, said first resistor is connected to the base of said first triode, the collector of said first triode is connected to the cathode of said first diode, the emitter of said first triode is grounded, and the anode of said first triode is connected to said second resistor;
the second temperature acquisition circuit comprises a second thermocouple, a third resistor, a second triode, a second diode and a fourth resistor, the second thermocouple is connected with the second lithium battery and the third resistor, the third resistor is connected with the base electrode of the second triode, the collector electrode of the second triode is connected with the cathode of the second diode, the emitter electrode of the second triode is grounded, and the anode of the second triode is connected with the fourth resistor;
the third temperature acquisition circuit comprises a third thermocouple, a fifth resistor, a third triode, a third diode and a sixth resistor, the third thermocouple is connected with a third lithium battery and the fifth resistor, the fifth resistor is connected with the base of a third triode, the collector of the third triode is connected with the cathode of the third diode, the emitter of the third triode is grounded, and the anode of the third triode is connected with the sixth resistor.
4. The protection system for multiple lithium batteries according to claim 2, wherein the overvoltage detection unit comprises a first voltage detection circuit, a second voltage detection circuit and a third voltage detection circuit, and the first voltage detection circuit, the second voltage detection circuit and the third voltage detection circuit are correspondingly connected to each input port of the overvoltage detection unit;
the first voltage detection circuit comprises a seventh resistor, a first switching tube, a fourth diode, a fifth diode, a fourth triode and an eighth resistor, wherein the seventh resistor is connected with the grid electrode of the first switching tube, the source electrode of the first switching tube is connected with the anode of the fourth diode, the cathode of the fourth diode and the cathode of the fifth diode are connected with the base electrode of the fourth triode, the emitter electrode of the fourth triode is connected with the anode of the fifth diode, and the collector electrode of the fourth triode is connected with the eighth resistor;
the second voltage detection circuit comprises a ninth resistor, a second switching tube, a sixth diode, a seventh diode, a fifth triode and a tenth resistor, wherein the ninth resistor is connected with the grid electrode of the second switching tube, the source electrode of the second switching tube is connected with the anode of the sixth diode, the cathode of the sixth diode and the cathode of the seventh diode are connected with the base electrode of the fifth triode, the emitter electrode of the fifth triode is connected with the anode of the seventh diode, and the collector electrode of the fifth triode is connected with the tenth resistor;
the third voltage detection circuit comprises an eleventh resistor, a third switching tube, an eighth diode, a ninth diode, a sixth triode and a twelfth resistor, wherein the eleventh resistor is connected with the grid electrode of the third switching tube, the source electrode of the third switching tube is connected with the anode of the eighth diode, the cathode of the eighth diode and the cathode of the ninth diode are connected with the base electrode of the sixth triode, the emitter electrode of the sixth triode is connected with the anode of the ninth diode, and the collector electrode of the sixth triode is connected with the twelfth resistor.
5. The protection system for multiple lithium batteries according to claim 4, wherein said first switching tube, said second switching tube and said third switching tube are MOS tubes, and said fourth transistor, said fifth transistor and said sixth transistor are amplifying transistors.
6. The system for protecting a plurality of lithium batteries according to claim 2, further comprising:
the three communication buses are respectively connected with the overvoltage detection circuit, the over-temperature protection circuit and the overcurrent protection circuit and are used for transmitting the real-time signals;
and the display module is connected with the three communication buses and is used for displaying the real-time signals.
7. The system for protecting multiple lithium batteries according to claim 6, wherein said display module comprises:
the judging unit is connected with the communication bus and used for judging whether the real-time signal exceeds a preset threshold value and generating a detection result;
and the adjusting unit is connected with the judging unit and used for adjusting the circuit where the lithium battery is located according to the detection result.
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