CN118713242B - Lithium battery control circuit and camera battery compartment - Google Patents
Lithium battery control circuit and camera battery compartment Download PDFInfo
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- CN118713242B CN118713242B CN202410738017.0A CN202410738017A CN118713242B CN 118713242 B CN118713242 B CN 118713242B CN 202410738017 A CN202410738017 A CN 202410738017A CN 118713242 B CN118713242 B CN 118713242B
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 33
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000007599 discharging Methods 0.000 claims abstract description 65
- 238000001514 detection method Methods 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000008878 coupling Effects 0.000 claims description 17
- 238000010168 coupling process Methods 0.000 claims description 17
- 238000005859 coupling reaction Methods 0.000 claims description 17
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005669 field effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/271—Lids or covers for the racks or secondary casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
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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
- H02J7/00302—Overcharge protection
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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
- H02J7/00306—Overdischarge protection
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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
- H02J7/0031—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
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application relates to a lithium battery control circuit and a camera battery bin, wherein the control circuit comprises a first protection unit and a second protection unit, a positive power input port of the first protection unit is electrically connected with a positive port, a positive power input port of the second protection unit and a positive electrode of a first battery cell unit, a secondary input port of the first protection unit is electrically connected with a secondary input port of the second protection unit and a negative electrode of the first battery cell unit, a negative power input port of the first protection unit is electrically connected with a negative electrode of the second battery cell unit, the first protection unit is electrically connected with a first charging switch and a first discharging switch, the negative electrode of the second battery cell unit is also electrically connected with a second discharging switch through a first charging switch and a first discharging switch, the second protection unit is electrically connected with the second charging switch and the second discharging switch, one end of the second charging switch, which is electrically connected with the second discharging switch, is not connected with the negative port, and an output protection circuit is arranged between the positive port and the negative port.
Description
Technical Field
The application relates to the technical field of lithium batteries, in particular to a lithium battery control circuit and a camera battery compartment.
Background
In the field of new energy batteries, a plurality of batteries are often connected in parallel to form corresponding battery core units, and then the battery core units are connected in series to form corresponding battery packs, so that the power supply requirements of large capacity and large current are met.
In the prior art, for the battery pack formed by connecting the battery cells in series, all the single battery cells and the whole battery pack are protected by arranging corresponding control circuits, for example, by monitoring the voltage and the current when all the single battery cells are charged and discharged, when overcharge or overdischarge occurs, the corresponding circuits are disconnected to stop the battery pack from continuing to charge or overdischarge, but in the related art, the protection of the battery pack connected in parallel has the defect that the protection of the battery pack cannot be maintained all the time, namely, when the corresponding protection circuit fails or is disconnected from the battery pack, the battery pack is not protected, so that the battery pack is damaged and the risk of battery explosion exists.
Aiming at the problems that the battery pack in the related art can not always maintain the protected state and is easy to damage the battery pack, a better technical scheme is not provided.
Disclosure of Invention
The application provides a lithium battery control circuit and a camera battery compartment, which at least solve the problems that a battery pack in the related art cannot always maintain a protected state and is easy to damage.
In a first aspect, the application provides a lithium battery control circuit, comprising a first protection unit and a second protection unit, wherein a positive power input port of the first protection unit is respectively and electrically connected with a positive port, a positive power input port of the second protection unit and a positive electrode of a first battery cell unit, a secondary input port of the first protection unit is respectively and electrically connected with a secondary input port of the second protection unit and an electrical connection point of the first battery cell unit and the second battery cell unit, a negative power input port of the first protection unit is electrically connected with a negative electrode of the second battery cell unit, a first charging switch and a first discharging switch which are electrically connected in series are controlled by the first protection unit, the negative electrode of the second battery cell unit is also electrically connected with a second discharge switch through the first charge switch and the first discharge switch, the second protection unit is used for controlling the second charge switch and the second discharge switch which are electrically connected in series, one end of the second charge switch, which is away from the second discharge switch and is electrically connected with a negative end opening, is electrically connected with an output protection circuit in a coupling manner, wherein the first protection unit is used for controlling the first charge switch and/or the first discharge switch to be turned on and off so as to protect the charge and discharge of a battery pack, and the battery pack is formed by connecting the first battery cell unit and the second battery cell unit in series; the second protection unit is used for controlling the on-off of the second charging switch and/or the second discharging switch, the battery pack protection circuit comprises a first protection unit, a second protection unit, an output protection circuit and a control unit, wherein the first protection unit and the second protection unit are arranged to protect the battery pack, the first protection unit and the second protection unit are also arranged to at least one of maintain protection of the battery pack, and the output protection circuit is used for controlling the positive electrode of the first battery cell unit to be disconnected from the positive port when the output of the battery pack is abnormal.
In some embodiments, the first protection unit includes a first control unit and a first RC filter circuit, the first port of the first control unit is electrically connected to the positive power input port of the first protection unit through one path of the first RC filter circuit, the second port of the first control unit is electrically connected to the secondary input port of the first protection unit through one path of the first RC filter circuit, the third port of the first control unit interfaces with the negative power input port of the first protection unit, the charge-discharge detection port of the first control unit is electrically connected to the input port of the first discharge switch through a first coupling resistor connected in series, the discharge control port of the first control unit is electrically connected to the controlled end of the first discharge switch through a second coupling resistor connected in series, the charge control port of the first control unit is electrically connected to the controlled end of the first charge switch, the first discharge switch and the output end of the first charge switch are electrically connected, and the charge control port of the first control unit is electrically connected to the negative power input port of the first protection unit through a third coupling resistor, the first charge control port of the first control unit is electrically connected to the first charge switch through a fourth coupling resistor,
The first control unit is used for determining whether the battery pack is normally charged or discharged by detecting voltages of the first cell unit and the second cell unit and detecting voltages between a negative power input port and a load detection port of the first cell unit and the second cell unit, wherein the voltages of the first cell unit and the second cell unit are determined by detecting voltages of a positive power input port, a secondary input port and a negative power input port of the first control unit;
The first control unit is further used for controlling the first discharging switch to be opened when the battery pack is determined to be over-discharged, and is further used for controlling the first charging switch to be opened when the battery pack is determined to be over-charged, and controlling the first discharging switch to be opened when at least one of the first battery cell unit and the first battery cell unit is detected to be opened.
In some embodiments, the first control unit includes a battery protection chip of the CM1022-CA type, and/or the first RC filter circuit includes an L-shaped RC filter circuit composed of a first resistor and a first capacitor.
In some embodiments, the first protection unit further comprises a temperature protection circuit, the temperature protection circuit comprises a second resistor and a first temperature sensor which are connected in series, an electric connection point of the second resistor and the first temperature sensor is electrically connected with a temperature protection detection port of the first control unit, one end of the second resistor, which is away from being electrically connected with the first temperature sensor, is electrically connected with a temperature protection reference port of the first control unit, one end of the first temperature sensor, which is away from being electrically connected with the second resistor, is electrically connected with a negative power supply input port of the first control unit, wherein the first temperature sensor is used for detecting the temperature of the battery pack during charging and discharging and generating a corresponding first voltage signal, and the first control unit is used for controlling the first charging switch and the first discharging switch to be disconnected when the first voltage signal received by the temperature protection reference port is larger than a preset temperature protection reference voltage.
In some of these embodiments, the second protection unit includes a second control unit and a second RC filter circuit, the first port of the second control unit is electrically connected with the positive power input port of the second protection unit through one path of the second RC filter circuit, the second port of the second control unit is electrically connected with the secondary input port of the second protection unit through one path of the second RC filter circuit, the third port of the second control unit interfaces with the negative power input port of the second protection unit, the discharge control port of the second control unit is electrically connected with the controlled end of the second discharge switch, the charging control port of the second control unit is electrically connected with the controlled end of the second charging switch, the second discharging switch is electrically connected with the output end of the second charging switch, the overcharge and discharge detection port of the second control unit is also electrically connected with the input end of the second charging switch through a fifth coupling resistor in series, wherein the second control unit is used for detecting the voltage of the first battery cell unit and the second battery cell unit, and detecting a voltage between a negative power input port and an overcharge and discharge detection port thereof to determine whether the battery pack is normally charged and discharged, wherein the voltages of the first and second cell units are determined by detecting the voltages of the positive, secondary and negative power input ports of the second control unit; the second control unit is further used for controlling the second discharging switch to be opened when the over-discharge of the battery pack is determined, the second control unit is further used for controlling the second charging switch to be disconnected when the battery pack is determined to be overcharged.
In some embodiments, the second control unit includes a SIT8252C model battery protection chip, and/or the second RC filter circuit includes an L-type RC filter circuit composed of a second resistor and a second capacitor.
In some embodiments, the electrical connection point between the input end of the second charging switch and the negative end is further electrically connected to a second temperature sensor, the other end of the second temperature sensor is electrically connected to an external power utilization end, the second temperature sensor is used for detecting the temperature of the battery pack during charging and discharging and transmitting a detected temperature signal to the external power utilization end, so that the external power utilization end controls the second control unit to perform charging and discharging control according to the received temperature signal, the output protection circuit comprises a fuse, a third capacitor and a fourth capacitor, the fuse is connected in series between the positive electrode of the first battery cell unit and the positive end, one end of the third capacitor is electrically connected with the fuse and the positive end, the other end of the third capacitor is electrically connected with the fourth capacitor, and the end of the fourth capacitor, which is electrically connected with the negative end of the third capacitor in a deviating manner, is electrically connected with the negative end.
In some embodiments, the first charge switch, the first discharge switch, the second charge switch, and the second discharge switch each comprise a switch tube, the switch tube comprises a control end, an input end, and an output end, the control end corresponding to the first charge switch is connected to the controlled end of the first discharge switch, the input end corresponding to the first discharge switch is connected to the input end of the first discharge switch, the output end corresponding to the first discharge switch is connected to the output end of the first discharge switch, the control end corresponding to the first charge switch is connected to the controlled end of the first charge switch, the input end corresponding to the first charge switch is connected to the input end of the first charge switch, the output end corresponding to the first charge switch is connected to the output end of the first charge switch, the control end corresponding to the second discharge switch is connected to the controlled end of the second discharge switch, the input end corresponding to the second discharge switch is connected to the input end of the second discharge switch, the control end corresponding to the second discharge switch is connected to the controlled end of the second charge switch, the control end corresponding to the second charge switch is connected to the output end of the second charge switch, the output end corresponding to the second charge switch is connected to the output end of the first charge switch, the output end corresponding to the output end of the first charge switch is connected to the output end of the first charge switch, and the output end corresponding to the output end of the charge switch is connected to the output end of the charge switch, the first discharging switch is turned off, when the input end and the output end of the switching tube corresponding to the first charging switch are turned off, the first charging switch is turned off, when the input end and the output end of the switching tube corresponding to the second discharging switch are turned off, the second discharging switch is turned off, and when the input end and the output end of the switching tube corresponding to the second charging switch are turned off, the second charging switch is turned off.
In some embodiments, a first disconnecting switch is arranged between the negative power supply input port of the first protection unit and the second discharging switch, and a second disconnecting switch is arranged between the negative power supply input port of the second protection unit and the negative terminal, wherein when the first disconnecting switch is closed, the first protection unit is disconnected from the battery pack, when the second disconnecting switch is closed, the second protection unit is disconnected from the battery pack, and when one of the first protection unit and the second protection unit is disconnected from the battery pack, the other one of the first protection unit and the second protection unit maintains protection of the battery pack
The application provides a battery compartment of a power camera, which comprises a compartment box, a control board arranged in the compartment box, a battery pack arranged in the compartment box and a cover plate covered on the compartment box, wherein the battery pack is also electrically connected with the control board, and a control circuit for controlling the charge and discharge of the battery pack is arranged on the control board, and the control circuit is the lithium battery control circuit of the first aspect.
Compared with the related art, the embodiment provides a lithium battery control circuit and a camera battery compartment, the lithium battery control circuit comprises a first protection unit and a second protection unit, the positive power input port of the first protection unit is respectively and electrically connected with the positive port, the positive power input port of the second protection unit and the positive electrode of the first battery cell unit, the secondary input port of the first protection unit is respectively and electrically connected with the secondary input port of the second protection unit and the electrical connection point of the first battery cell unit and the second battery cell unit, the negative power input port of the first protection unit is electrically connected with the negative electrode of the second battery cell unit, the first protection unit controls a first charging switch and a first discharging switch which are electrically connected in series, the negative electrode of the second battery cell unit is also electrically connected with a second discharge switch through the first charge switch and the first discharge switch, the second protection unit is used for controlling the second charge switch and the second discharge switch which are electrically connected in series, one end of the second charge switch, which is away from the second discharge switch and is electrically connected with a negative end opening, is electrically connected with an output protection circuit in a coupling manner, wherein the first protection unit is used for controlling the first charge switch and/or the first discharge switch to be turned on and off so as to protect the charge and discharge of a battery pack, and the battery pack is formed by connecting the first battery cell unit and the second battery cell unit in series; the second protection unit is used for controlling the on-off of the second charging switch and/or the second discharging switch, the battery pack protection circuit comprises a first protection unit, a second protection unit, an output protection circuit and a control circuit, wherein the first protection unit is used for protecting the battery pack, the second protection unit is used for protecting the battery pack, the first protection unit and the second protection unit are also arranged to at least one of the battery pack and maintain to protect the battery pack, the output protection circuit is used for controlling the positive electrode of the first battery cell unit to be disconnected from the positive port when the output of the battery pack is abnormal, and the two protection units are used for protecting the battery pack, so that at least one protection unit maintains to protect the battery pack.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a block diagram of a control circuit of a lithium battery according to an embodiment of the present application;
Fig. 2 is a topology structure diagram of a lithium battery control circuit according to an embodiment of the present application;
Fig. 3 is a block diagram of a control circuit for a lithium battery according to a preferred embodiment of the present application;
Fig. 4 is a block diagram showing a control circuit for a lithium battery according to still another preferred embodiment of the present application;
FIG. 5 is a topology diagram of a preferred embodiment lithium battery control circuit of the present application;
fig. 6 is a perspective view of a battery compartment of a camera according to an embodiment of the present application;
Fig. 7 is an exploded view of fig. 6.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The lithium battery control circuit of the present application will be described below by way of specific embodiments with reference to the accompanying drawings in the embodiments of the present application.
Fig. 1 is a block diagram of a control circuit of a lithium battery according to an embodiment of the present application. As shown in fig. 1, the embodiment of the present application provides a lithium battery control circuit for controlling a battery pack formed by connecting a first battery cell 001 in series with a second battery cell 002, which comprises a first protection unit 100 and a second protection unit 200, wherein a positive power input port 101 of the first protection unit 100 is electrically connected with a positive port p+ and a positive power input port 201 of the second protection unit 200 and a positive electrode of the first battery cell 001, a secondary input port 102 of the first protection unit 100 is electrically connected with a secondary input port 202 of the second protection unit 200 and an electrical connection point (respectively corresponding to a negative electrode of the first battery cell 001 and a positive electrode of the second battery cell 002) of the first battery cell 002, a negative power input port 103 of the first protection unit 100 is electrically connected with a negative electrode of the second battery cell 002, a first charge switch 300 and a first discharge switch 400 which are electrically connected in series are also electrically connected with each other through the first charge switch 300 and the first discharge switch 400, a negative electrode of the second battery cell 100 is electrically connected with a negative electrode of the second battery cell 002, a negative electrode of the second battery cell 002 is electrically connected with a negative electrode of the second battery cell 002 (respectively corresponding to a negative electrode of the first battery cell 001 and a positive electrode of the second battery cell 002), a negative electrode of the second battery cell 002 is electrically connected with a negative electrode of the second battery cell 002, a positive electrode of the first charge switch 500 is electrically connected with a negative electrode of the second battery cell 002, a positive electrode of the first battery cell 500 is electrically connected with a negative electrode of the positive electrode 500 through the first charge switch 300 is electrically connected with a negative electrode of the first charge switch 500,
The first protection unit 100 is configured to control on/off of the first charging switch 300 and/or the first discharging switch 400 to protect charge and discharge of a battery pack, where the battery pack is formed by connecting a first battery cell unit 001 and a second battery cell unit 001 in series;
The second protection unit 200 is used for controlling the on-off of the second charging switch 600 and/or the second discharging switch 500 to protect the charging and discharging of the battery pack;
The first protection unit 100 and the second protection unit 200 are further provided such that at least one of them maintains protection of the battery pack;
The output protection circuit 700 is configured to control the positive electrode of the first cell unit 001 to be disconnected from the positive port p+ when the output of the battery pack is abnormal.
In this embodiment, during normal charge and discharge of the battery pack, the first protection unit 100 and the second protection unit 200 are operated at the same time, the first protection unit 100 continuously detects the voltages of the first cell unit 001 and the second cell unit 002 while detecting the voltages of the load detection port to control the charge and discharge, when the voltages of the first cell unit 001 and the second cell unit 002 are both greater than the over-discharge protection voltage and less than the over-charge protection voltage, the first charge switch 300 and the first discharge switch 400 are both enabled to be in the closed on state when the voltages of the load detection port are both greater than the charge protection voltage and the over-charge detection delay time, or when the voltages of the first cell unit 001 and the second cell unit 002 are both greater than the charge over-discharge protection voltage and the over-charge protection delay time, the first charge switch 300 is turned off to control the battery pack to stop charging, when the voltages of any one of the first cell unit 001 and the second cell unit 002 are both greater than the charge over-discharge protection voltage and the over-charge protection delay time is exceeded, the first charge switch 300 is turned off when the voltages of any one of the first cell unit 001 and the second cell unit 002 are both greater than the charge over-charge protection voltage and the over-charge protection time is exceeded, the voltage of any one of the first cell unit 002 is detected over-charge protection time is exceeded, the over-charge protection time is exceeded by the over-charge detection delay time, and the voltage is exceeded by the charge protection time is exceeded by the over-charge detection time, and the voltage is exceeded by the charge protection time is detected, when the voltages of the first and second battery cells 001 and 002 are both greater than the overdischarge detection voltage and less than the overcharge detection voltage, and the voltages of the overcharge and discharge detection ports are greater than the charge and overcurrent detection voltage and less than the discharge and overcurrent detection voltage, the second charge switch 600 and the second discharge switch 500 are both enabled to be in a closed conduction state, and the battery pack can be normally charged and discharged, it is understood that when one of the first and second protection units 100 and 200 is in an isolated state from the battery pack, or one of the protection units is in a process of continuously detecting the voltages corresponding to the battery pack, errors occur in the detected voltages and/or voltage differences and the situation that the charge and discharge cannot be accurately controlled to stop, the other protection unit is used for charge and discharge protection, so that the battery pack is always in a protected state, and the battery pack is prevented from being damaged.
In this embodiment, an output protection circuit is disposed between the positive port p+ and the negative port P-, and when the output of the battery is abnormal (e.g., an overcurrent caused by a short circuit, an overvoltage charge and discharge of the battery) and the charging or the discharge cannot be stopped without being controlled, the positive electrode (corresponding to the positive electrode of the first cell unit 001) of the battery is disconnected from the positive port p+ by the output protection circuit 700, so as to stop the charging or the discharge of the battery and further protect the battery.
The lithium battery control circuit adopts at least one of the first protection unit 100 and the second protection unit 200 to maintain the protection of the battery pack, controls the on-off of the first charging switch 400 and/or the first discharging switch 300 through the first protection unit 100, controls the on-off of the second charging switch 600 and/or the second discharging switch 500 through the second protection unit 200 to protect the charge and discharge of the battery pack, and also adopts two protection units to protect the battery pack when the output of the battery pack is abnormal by arranging the output protection circuit 700 so as to control the positive electrode and the positive port of the first battery cell 001 to be disconnected, thereby ensuring that at least one protection unit maintains the protection of the battery pack.
Fig. 2 is a topology diagram of a lithium battery control circuit according to an embodiment of the present application, referring to fig. 1 to 2, in some embodiments, a first protection unit 100 includes a first control unit 11 and a first RC filter circuit 12, a first port (referring to a VC1 pin of U1 in fig. 2) of the first control unit 11 is electrically connected to a positive power input port 101 (which may refer to b+ in fig. 2) of the first protection unit 100 through a first RC filter circuit 12 (referring to an L-shaped RC filter circuit composed of a resistor R1 and a capacitor C1 in fig. 2), a second port (referring to a VC2 pin of U1 in fig. 2) of the first control unit 11 is electrically connected to a secondary input port 102 (which may refer to BM in fig. 2) of the first protection unit 11 through a first RC filter circuit 12 (referring to a L-shaped RC filter circuit composed of a resistor R2 and a capacitor C2 in fig. 2), the third port (refer to the VSS pin of U1 in fig. 2) of the first control unit 11 is abutted against the negative power input port 103 (refer to the B-pin of fig. 2) of the first protection unit 100, the charge-discharge detection port (refer to the VIN pin of U1 in fig. 2) of the first control unit 11 is electrically connected to the input terminal (refer to the S-terminal of Q1 in fig. 2) of the first discharge switch 400 through the series first coupling resistor R3, the discharge control port (refer to the D0 pin of U1 in fig. 2) of the first control unit 11 is electrically connected to the controlled terminal (refer to the G-terminal of Q1 in fig. 2) of the first discharge switch 400 through the series second coupling resistor R4, the charge control port (refer to the CO pin of U1 in fig. 2) of the first control unit 11 is electrically connected to the controlled end (refer to the G end of Q2 in fig. 2) of the first charge switch 300, the first discharge switch 400 and the output end (refer to the D ends of Q1 and Q2 in fig. 2) of the first charge switch 300 are electrically connected, and are electrically connected to the negative power supply input port 103 (refer to the B-pin in fig. 2) of the first protection unit 100 through the third coupling resistor R5, the load detection port (refer to the VM pin of U1 in fig. 2) of the first control unit 11 is also electrically connected to the electrical connection point of the first charge switch 300 and the second discharge switch 500 through the fourth coupling resistor R6 in series,
A first control unit 11 for determining whether the battery pack is normally charged or discharged by detecting voltages of the first and second battery cells 001 and 002, and detecting voltages between the negative power input port 103 and the load detection port (refer to the VM pin of U1 in fig. 2) thereof, wherein the voltages of the first and second battery cells 001 and 002 are determined by detecting voltages of the positive power input port 101, the secondary input port 102 and the negative power input port 103 of the first control unit 11;
The first control unit 11 is further configured to control the first discharge switch 400 to be turned off when it is determined that the battery pack is overdischarged, and is further configured to control the first charge switch 300 to be turned off when it is determined that the battery pack is overcharged, and the first control unit 11 controls the first discharge switch 400 to be turned off with the first charge switch 300 when it is detected that at least one of the first battery cell 001 and the first battery cell 002 is turned off.
It is to be understood that, in the present embodiment, the overcharge includes an overcharge state and a charge overcurrent state, the overdischarge includes an overdischarge state and a discharge overcurrent state, the overcharge state is determined by detecting the magnitudes of the voltages of the first and second battery cells 001 and 002 and the overcharge protection voltage, the overdischarge state is determined by detecting the magnitudes of the voltages of the first and second battery cells 001 and 002 and the overdischarge protection voltage, the charge overcurrent state is determined by detecting the magnitudes of the voltages between the negative power supply input port 103 and the load detection port (refer to the VM pin of U1 in fig. 2) and the charge overcurrent protection voltage, and the discharge overcurrent state is determined by detecting the magnitudes of the voltages between the negative power supply input port 103 and the load detection port (refer to the VM pin of U1 in fig. 2).
In some alternative embodiments, the first control unit 11 includes, but is not limited to, a battery protection chip U1 of CM1022-CA type, and the first RC filter circuit 12 includes an L-type RC filter circuit composed of a first resistor (refer to R1 and R2 in FIG. 2) and a first capacitor (refer to C1 and C2 in FIG. 2).
In this embodiment, the first control unit 11 cooperates with the corresponding first RC filter circuit 12 to continuously perform voltage detection on the first battery cell unit 001 and the second battery cell unit 002, and referring to fig. 3, the battery protection chip U1 corresponding to the first control unit 11 performs voltage detection on the first battery cell unit 001 through the pin VC1 and the pin VC2, performs voltage detection on the second battery cell unit 002 through the pin VC2 and the pin VSS, and detects the voltage between the negative power input port 103 and the load detection port through the pin VM and the pin VSS.
Fig. 3 is a block diagram of a lithium battery control circuit according to a preferred embodiment of the present application, in order to ensure that the battery pack is not damaged by too high or too low a temperature during the charge and discharge of the battery pack, referring to fig. 2 to 3, the first protection unit 100 further includes a temperature protection circuit 13, in some alternative embodiments, the temperature protection circuit 13 includes a second resistor R9 and a first temperature sensor NTC connected in series, an electrical connection point of the second resistor R9 and the first temperature sensor NTC is electrically connected to a temperature protection detection port (refer to an RTS pin of U1 in fig. 2) of the first control unit 11, an end of the second resistor R9 electrically connected to the first temperature sensor NTC is electrically connected to a temperature protection reference port (refer to an RTV pin of U1 in fig. 2) of the first control unit 11, an end of the first temperature sensor NTC electrically connected to an end electrically connected to the second resistor R9 is electrically connected to a negative power supply input port (refer to B-) of the first control unit 11, wherein,
The first temperature sensor NTC is used for detecting the temperature of the battery pack during charging and discharging and generating a corresponding first voltage signal;
The first control unit 11 is configured to control the first charge switch 300 and the first discharge switch 400 to be turned off when the first voltage signal received by the temperature protection reference port (refer to the RTV pin of U1 in fig. 2) is greater than a preset temperature protection reference voltage.
To further protect the battery pack from charge and discharge, referring to fig. 1 to 2, in some embodiments, the second protection unit 200 includes a second control unit 21 and a second RC filter circuit 22, a first port (refer to the VDD pin of U2 in fig. 2) of the second control unit 21 is electrically connected to the positive power supply input port 201 (refer to the L-type RC filter circuit formed by the resistor R7 and the capacitor C3 in fig. 2) of the second protection unit 200 through a second RC filter circuit 22 (refer to the b+ in fig. 2), a second port (refer to the BI pin of U2 in fig. 2) of the second control unit 21 is electrically connected to the secondary input port 202 (refer to the L-type RC filter circuit formed by the resistor R8 and the capacitor C4 in fig. 2) of the second protection unit 200 through a second RC filter circuit 22 (refer to the B-pin of U2 in fig. 2), a third port (refer to the B-pin of U2 in fig. 2) of the second control unit 21 is electrically connected to the power supply input port 203 of the second protection unit 200, a second port (refer to the Q pin of U2 in fig. 2) of the second control unit 21 is electrically connected to the charge port 500 of the charge switch (refer to the Q2) of the Q2 in fig. 2) of the second control unit 2 through a second RC filter circuit 22 (refer to the BI pin of U4 in fig. 2) and a second RC filter circuit of C2, a Q pin of Q2 is electrically connected to the Q pin 500 in fig. 2 of Q2 to the charge switch (refer to the Q2) of Q2 in fig. 2) of the charge switch 500, the overcharge-discharge detection port (refer to the CS pin of U2 in fig. 2) of the second control unit 21 is also electrically connected to the input terminal (refer to the S terminal of Q4 in fig. 2) of the second charge switch 600 through a fifth coupling resistor R10 connected in series, wherein,
A second control unit 21 for determining whether the battery pack is normally charged or discharged by detecting voltages of the first and second battery cells 001 and 002, and detecting voltages between the negative power input port 203 and the overcharge-discharge detection port (refer to the CS pin of U2 in fig. 2), wherein the voltages of the first and second battery cells 001 and 002 are determined by detecting voltages of the positive power input port 201, the secondary input port 202, and the negative power input port 203 of the second control unit 21;
The second control unit 21 is further configured to control the second discharging switch 500 to be turned off when it is determined that the battery pack is overdischarged, and the second control unit 21 is further configured to control the second charging switch 600 to be turned off when it is determined that the battery pack is overcharged.
It will be appreciated that in the present embodiment, the overcharge includes an overcharge state and a charge overcurrent state, the overdischarge includes an overdischarge state and a discharge overcurrent state, the overcharge state is determined by detecting the magnitudes of the voltages of the first and second battery cells 001 and 002 and the overcharge detection voltage, the overdischarge state is determined by detecting the magnitudes of the voltages of the first and second battery cells 001 and 002 and the overdischarge detection voltage, the charge overcurrent state is determined by detecting the magnitudes of the voltages between the negative power supply input port 203 and the overcharge detection port and the charge overcurrent detection voltage, and the discharge overcurrent state is determined by detecting the magnitudes of the voltages between the negative power supply input port 203 and the overcharge detection port and the discharge overcurrent detection voltage.
In some alternative embodiments, the second control unit 21 includes, but is not limited to, a SIT8252C type battery protection chip, and the second RC filter circuit 22 includes an L type RC filter circuit composed of a second resistor (refer to R7 and R8 in fig. 2) and a second capacitor (refer to C3 and C4 in fig. 2).
In this embodiment, the second control unit 21 cooperates with the corresponding second RC filter circuit 33 to continuously detect voltages of the first and second battery cells 001 and 002, and referring to fig. 3, the battery protection chip U2 corresponding to the second control unit 21 detects voltages of the first battery cell 001 through the pin VDD and the pin BI, detects voltages of the second battery cell 002 through the pin BI and the pin B-, and detects voltages between the negative power input port 203 and the overcharge-discharge detection port through the pin CS and the pin B-.
To achieve temperature protection of the battery pack, in some embodiments, referring to fig. 2, an electrical connection point between an input end (referring to an S end of Q4 in fig. 2) of the second charging switch 600 and the negative end P-is further electrically connected to a second temperature sensor RT, and the other end of the second temperature sensor RT is electrically connected to an external power end (referring to a network reference T in fig. 2), where the second temperature sensor RT is configured to detect a temperature of the battery pack during charging and discharging, and transmit a detected temperature signal to the external power end, so that the external power end controls the second control unit 21 to perform charging and discharging control according to the received temperature signal.
To achieve protection of the battery pack in the event of output abnormality, referring to fig. 2, in some embodiments, the output protection circuit 700 includes a fuse F1, a third capacitor C5 and a fourth capacitor C6, where the fuse F1 is connected in series between the positive electrode of the first cell 001 and the positive port p+, one end of the third capacitor C5 is electrically connected to the fuse F1 and the positive port p+, the other end is electrically connected to the fourth capacitor C6, and the end of the fourth capacitor C6, which is electrically connected to the negative port p— away from the end electrically connected to the third capacitor C5.
It can be understood that an output protection circuit is disposed between the positive port p+ and the negative port P-of the battery pack, when the output of the battery pack is abnormal (for example, the battery pack is overcurrent due to a short circuit, and the battery pack is overcharged or discharged) and cannot be charged or discharged without being controlled to stop, the fuse F1 is fused, so that the positive electrode (corresponding to the positive electrode of the first battery cell 001) of the battery pack is disconnected from the positive port p+, and the battery pack is further stopped from being charged or discharged, thereby further protecting the battery pack.
In order to enable the on-off of the first charge switch 300, the first discharge switch 400, the second charge switch 600 and the second discharge switch 500, referring to fig. 2, in some embodiments, the first charge switch 300, the first discharge switch 400, the second charge switch 600 and the second discharge switch 500 each include a switch tube (refer to Q1, Q2, Q3 and Q4 in fig. 2), the switch tube includes a control terminal (G terminal), an input terminal (S terminal) and an output terminal (D), the control terminal (G terminal) of the first discharge switch 300 is abutted to the controlled terminal of the first discharge switch 300, the input terminal (S terminal) of the first discharge switch 300 is abutted to the input terminal of the first discharge switch 300, the output terminal (D terminal of the Q1) of the first discharge switch 300 is abutted to the output terminal of the first discharge switch 300, the control terminal (G terminal) of the first charge switch 400 is abutted to the controlled terminal of the first charge switch 400, the input terminal (S terminal) of the second charge switch 400 is abutted to the second charge switch 400, the output terminal (S terminal of the second charge switch 500) is abutted to the second charge switch 500 is abutted to the controlled terminal of the second charge switch 400, the output terminal of the second charge switch 400 is abutted to the second charge switch 500, the corresponding input end (S end of Q4) of the second charging switch 600 is abutted against the input end of the second charging switch 600, and the corresponding output end (D end of Q4) of the second charging switch 600 is abutted against the output end of the second charging switch 600,
And the switching tube (refer to Q1, Q2, Q3 and Q4 in fig. 2) is used for controlling the on-off of the input end and the output end according to the enabling signals received by the control end.
When the input end and the output end of the switching tube Q1 corresponding to the first discharging switch 400 are disconnected, the first discharging switch 400 is disconnected, when the input end and the output end of the switching tube Q2 corresponding to the first charging switch 300 are disconnected, the first charging switch 300 is disconnected, when the input end and the output end of the switching tube Q3 corresponding to the second discharging switch 500 are disconnected, the second discharging switch 500 is disconnected, and when the input end and the output end of the switching tube Q4 corresponding to the second charging switch 600 are disconnected, the second charging switch 600 is disconnected.
It should be noted that, the switching transistor in the embodiment of the present application includes, but is not limited to, a triode, a MOS transistor, and a field effect transistor. Moreover, according to the disclosure, those skilled in the art will readily recognize that the switching tube disclosed in the present application is modified into the first charging switch 300, the first discharging switch 400, the second charging switch 600 and the second discharging switch 500 according to the specific type of the switching tube, so that the switching tube may be an NPN-type or a PNP-type triode, an N-channel or a P-channel switching MOS tube, or an N-type or a P-type field effect transistor, and the switching tube is not limited in embodiments of the present application, and in some alternative embodiments, the switching tube is preferably a PAN 2060P-type MOS tube.
Fig. 4 is a block diagram illustrating a structure of a lithium battery control circuit according to still another preferred embodiment of the present application, fig. 5 is a topology diagram illustrating a lithium battery control circuit according to a preferred embodiment of the present application, and in order to isolate one of the first protection unit 100 and the second protection unit 200 from the battery pack, referring to fig. 4 and 5, in some embodiments, a first open switch K1 is provided between the negative power input port 103 of the first protection unit 100 and the second discharge switch 500, and a second open switch K2 is provided between the negative power input port 203 and the negative terminal P-of the second protection unit 200, wherein,
When the first cut-off switch K1 is closed, the first protection unit 100 is disconnected from the battery pack;
when the second disconnection switch K2 is closed, the second protection unit 200 is disconnected from the battery pack;
When one of the first protection unit 100 and the second protection unit 200 is disconnected from the battery pack, the other one of the first protection unit 100 and the second protection unit 200 maintains protection of the battery pack.
Fig. 6 is a three-dimensional structure diagram of a camera battery compartment according to an embodiment of the present application, fig. 7 is an exploded schematic diagram of fig. 6, and referring to fig. 6 and 7, an embodiment of the present application further provides a camera battery compartment, which includes a compartment 01, a control board 02 disposed in the compartment 01, a battery pack 03 disposed in the compartment 01, and a cover board 04 covering the compartment 01, where the battery pack 03 is further electrically connected to the control board 02, and a control circuit for controlling charging and discharging of the battery pack is disposed on the control board 02, and the control circuit includes a lithium battery control circuit according to any one of the foregoing embodiments.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include others that are expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
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| CN206250757U (en) * | 2016-12-06 | 2017-06-13 | 珠海市古鑫电子科技有限公司 | Lithium battery explosive-proof protector circuit |
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| CA2602930C (en) * | 2006-09-19 | 2013-08-06 | Hitachi Koki Co., Ltd. | Adaptor, assembly of battery pack and adaptor, and electric tool with the same |
| EP2079142B1 (en) * | 2008-01-10 | 2010-09-29 | Research In Motion Limited | Rechargeable battery pack with a thermal protection circuit |
| CN112311030B (en) * | 2019-07-30 | 2022-06-21 | 凹凸电子（武汉）有限公司 | Battery protection system, battery pack, and battery pack protection method |
| CN115065127A (en) * | 2022-07-21 | 2022-09-16 | 维沃移动通信有限公司 | Overvoltage protection circuit, charging method and device, electronic equipment and storage medium |
| CN117060531B (en) * | 2023-08-14 | 2024-03-08 | 东莞航电新能源科技有限公司 | Mutual charge prevention control circuit and lithium battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206250757U (en) * | 2016-12-06 | 2017-06-13 | 珠海市古鑫电子科技有限公司 | Lithium battery explosive-proof protector circuit |
| CN221009809U (en) * | 2023-09-01 | 2024-05-24 | 欣旺达电子股份有限公司 | Battery protection circuit and battery |
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