CN116264407A - Protection circuit of silicon-oxygen negative electrode battery and silicon-oxygen negative electrode battery - Google Patents

Protection circuit of silicon-oxygen negative electrode battery and silicon-oxygen negative electrode battery Download PDF

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Publication number
CN116264407A
CN116264407A CN202111530391.4A CN202111530391A CN116264407A CN 116264407 A CN116264407 A CN 116264407A CN 202111530391 A CN202111530391 A CN 202111530391A CN 116264407 A CN116264407 A CN 116264407A
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China
Prior art keywords
electrically connected
battery cell
circuit
battery
output
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CN202111530391.4A
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Chinese (zh)
Inventor
杨瑞福
杜思红
陈仁杰
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Beijing Xiaomi Mobile Software Co Ltd
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Beijing Xiaomi Mobile Software Co Ltd
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Priority to CN202111530391.4A priority Critical patent/CN116264407A/en
Publication of CN116264407A publication Critical patent/CN116264407A/en
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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
    • 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
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge 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
    • H02J7/00304—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
    • H02J7/00306—Overdischarge 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
    • H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting 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
    • 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
    • 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
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • 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
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Abstract

The application provides a protection circuit of a silicon-oxygen negative electrode battery and the silicon-oxygen negative electrode battery. The protection circuit comprises a boost circuit and a control end. The boost circuit is electrically connected with the battery core. The controller comprises a detection end and a control end. The detection end is electrically connected with the battery cell and is used for detecting the output voltage of the battery cell. The control end is electrically connected with the boost circuit. When the output voltage of the battery core is in a high-voltage discharge voltage range, the control end controls the booster circuit to be not operated, and when the output voltage of the battery core is in a low-voltage discharge voltage range lower than the high-voltage discharge voltage range, the control end controls the booster circuit to boost the output voltage of the battery core. The silicon-oxygen cathode battery comprises a battery core and a protection circuit. When the controller detects that the output voltage of the battery core is in the low-voltage discharge voltage range, the booster circuit is controlled to boost the output voltage of the battery core, so that the boosted output voltage can continue to supply power to a load, and the capacity loss of the battery is reduced.

Description

Protection circuit of silicon-oxygen negative electrode battery and silicon-oxygen negative electrode battery
Technical Field
The application relates to the field of batteries, in particular to a protection circuit of a silicon-oxygen negative electrode battery and the silicon-oxygen negative electrode battery.
Background
Currently, lithium batteries of electronic devices used include graphite negative electrode batteries and silicon-oxygen negative electrode batteries. The dischargeable capacity of the silicon-oxygen negative electrode battery is larger than that of the graphite negative electrode battery with the same battery volume, and therefore, the silicon-oxygen negative electrode battery is increasingly widely used. However, in the low voltage region, the capacity of the silicon-oxygen negative electrode battery that can be discharged is larger than the discharge capacity of the graphite negative electrode battery, and the discharge cut-off voltage of the silicon-oxygen negative electrode battery can reach 2.75V, but the shutdown voltage of the load may be higher than the discharge cut-off voltage of the silicon-oxygen negative electrode battery, for example, 3.3V. Therefore, when the voltage of the silicon-oxygen negative electrode battery is lower than the shutdown voltage of the load, the load cannot work normally, but the voltage of the silicon-oxygen negative electrode battery is not reduced to the discharge cut-off voltage of the silicon-oxygen negative electrode battery, so that the problem of large capacity loss of the silicon-oxygen negative electrode battery is caused.
Disclosure of Invention
The application provides a protection circuit and a silicon-oxygen negative electrode battery aiming at reducing capacity loss of the silicon-oxygen negative electrode battery.
The application provides a protection circuit of silica negative pole battery, silica negative pole battery includes the electric core, wherein protection circuit includes:
the booster circuit is electrically connected with the battery core; and
The controller comprises a detection end and a control end; the detection end is electrically connected with the battery cell and is used for detecting the output voltage of the battery cell; the control end is electrically connected with the boost circuit; and the control end controls the booster circuit to be not operated when the output voltage of the battery cell is in a high-voltage discharge voltage range, and controls the booster circuit to boost the output voltage of the battery cell when the output voltage of the battery cell is in a low-voltage discharge voltage range lower than the high-voltage discharge voltage range.
Optionally, the protection circuit further includes:
an overcurrent protection circuit;
the switch circuit is electrically connected between the overcurrent protection circuit and the battery cell;
the over-current protection circuit is used for controlling the switch circuit to be turned off when the battery cell is overcharged or overdischarged.
Optionally, the overcurrent protection circuit includes a battery detection pin and a power supply pin; the battery detection pin is electrically connected with the detection end; the power supply pin is electrically connected between the battery cell and the switch circuit; the controller detects the output voltage of the battery cell through the battery detection pin and the power supply pin.
Optionally, the over-current protection circuit includes a first protection chip and a first discharge capacitor; the battery detection pin and the power supply pin are arranged on the first protection chip; the first discharging capacitor is electrically connected between the battery cell and the power supply pin and is used for supplying power to the first protection chip; and
the overcurrent protection circuit comprises a second protection chip and a second discharge capacitor; the second protection chip comprises a first power supply pin which is electrically connected with the battery cell; the second discharging capacitor is electrically connected between the battery cell and the first power pin and is used for supplying power to the second protection chip.
Optionally, the protection circuit comprises an output end and a current backflow prevention circuit; the current backflow prevention circuit is electrically connected between the battery cell and the output end and is electrically connected with the boost circuit, and is used for preventing current from flowing from the output end to the battery cell when the output voltage of the battery cell is increased by the boost circuit, and communicating the battery cell with the output end when the output voltage of the battery cell is in a high-voltage discharge voltage range.
Optionally, the current backflow prevention circuit comprises a first switching tube and a second switching tube which are connected in series back to back, and the second switching tube is electrically connected between the first switching tube and the output end;
the boost circuit comprises a boost input end and a boost output end, wherein the boost input end is electrically connected between the battery cell and the first switch tube, the boost output end is electrically connected with the output end, and the boost circuit comprises an enabling pin and is electrically connected with the control end of the controller.
Optionally, the first switch tube includes a first PMOS tube, the second switch tube includes a second PMOS tube, a drain electrode of the first PMOS tube is electrically connected to the battery cell, and a source electrode of the first PMOS tube is electrically connected to a source electrode of the second PMOS tube; the drain electrode of the second PMOS tube is electrically connected with the output end; the grid electrode of the first PMOS tube and the grid electrode of the second PMOS tube are electrically connected with the control end of the controller.
Optionally, the current backflow prevention circuit comprises a first diode and a second diode; the anode of the first diode and the source electrode of the first PMOS tube, and the cathode of the first diode is electrically connected with the drain electrode of the first PMOS tube; the anode of the second diode is electrically connected with the source electrode of the second PMOS tube, and the cathode of the second diode is electrically connected with the drain electrode of the second PMOS tube.
Optionally, the overcurrent protection circuit includes a first protection chip and a second protection chip; the first protection chip comprises a first charging output pin, and the second protection chip comprises a second charging output pin;
the switching circuit comprises a third switching tube and a fourth switching tube; the first charging output pin is electrically connected with the control end of the third switching tube, and the second charging output pin is electrically connected with the control end of the fourth switching tube;
when the battery cell is overcharged, the first protection chip and the second protection chip control the third switching tube and the fourth switching tube to be turned off.
Optionally, the first protection chip includes a first discharge output pin, and the second protection chip includes a second discharge output pin;
the switching circuit comprises a fifth switching tube and a sixth switching tube; the first discharging output pin is electrically connected with the control end of the fifth switching tube, and the second discharging output pin is electrically connected with the control end of the sixth switching tube;
when the battery cell is overdischarged, the first protection chip and the second protection chip control the fifth switching tube and the sixth switching tube to be turned off.
The application also provides a silicon oxygen cathode battery, which comprises an electric core; and
The protection circuit is electrically connected between the positive electrode and the negative electrode of the battery cell.
The application provides a protection circuit of silica negative pole battery. The protection circuit comprises a boost circuit and a control end. The boost circuit is electrically connected with the battery core. The controller comprises a detection end and a control end. The detection end is electrically connected with the battery cell and is used for detecting the output voltage of the battery cell. The control end is electrically connected with the boost circuit. When the output voltage of the battery core is in a high-voltage discharge voltage range, the control end controls the booster circuit to be not operated, and when the output voltage of the battery core is in a low-voltage discharge voltage range lower than the high-voltage discharge voltage range, the control end controls the booster circuit to boost the output voltage of the battery core. When the controller detects that the output voltage of the battery core is in the low-voltage discharge voltage range, the booster circuit is controlled to boost the output voltage of the battery core, so that the boosted output voltage can continue to supply power to a load, and the capacity loss of the battery is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
FIG. 1 is a circuit block diagram of a silicon oxygen negative electrode battery of the present application;
FIG. 2 is a schematic diagram showing a comparison of the discharge condition of a silicon oxygen negative electrode battery and the discharge condition of a graphite negative electrode battery;
FIG. 3 is a functional block diagram of one embodiment of a protection circuit for the silicon-oxygen negative electrode battery shown in FIG. 1;
fig. 4 is a circuit diagram of a protection circuit of the silicon oxygen anode battery shown in fig. 3.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with some aspects of the present application as detailed in the accompanying claims.
The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The application provides a protection circuit of silica negative pole battery. The silicon-oxygen negative electrode battery comprises an electric core. The protection circuit comprises a boost circuit and a controller. The boost circuit is electrically connected with the battery core. The controller comprises a detection end and a control end. The detection end is electrically connected with the battery cell and is used for detecting the output voltage of the battery cell. The control end is electrically connected with the boost circuit. The controller controls the booster circuit to be not operated when the output voltage of the battery core is in a high-voltage discharge voltage range through the control end, and controls the booster circuit to boost the output voltage of the battery core when the output voltage of the battery core is in a low-voltage discharge voltage range lower than the high-voltage discharge voltage range. When the controller detects that the output voltage of the battery core is in the low-voltage discharge voltage range, the booster circuit is controlled to boost the output voltage of the battery core, so that the boosted output voltage can continue to supply power to a load, and the capacity loss of the battery is reduced.
The application also provides a silicon-oxygen cathode battery which comprises a battery core and a protection circuit. The protection circuit is electrically connected between the positive electrode and the negative electrode of the battery core.
Fig. 1 is a circuit block diagram of a silicon oxygen anode battery 1 provided in the present application. As shown in fig. 1, the silicon-oxygen anode battery 1 includes a cell 2 and a protection circuit 3. The protection circuit 3 is electrically connected between the positive electrode and the negative electrode of the battery cell 2. The protection circuit 3 is used for preventing the battery cell 2 from being overcharged, overdischarged, overcurrent and short-circuited, so as to prolong the service life of the battery cell 2.
Fig. 2 is a schematic diagram showing a comparison of the discharge condition of the silicon oxygen negative electrode battery 1 and the discharge condition of the graphite negative electrode battery provided by the application. As shown in fig. 2, the abscissa is the battery capacity Q in units of: mAH (milliamp hours). The ordinate is the battery discharge cutoff voltage U, in units of: v (volts). The discharge cut-off voltage of the graphite negative electrode battery is 3.0V, and the corresponding battery capacity is Q1. The silicon-oxygen negative electrode battery has a discharge cut-off voltage of 2.75V and a corresponding battery capacity of Q2. As can be seen from the figures, Q2> Q1, that is, the silicon oxygen negative electrode battery can consume more battery capacity at its corresponding discharge cutoff voltage than the graphite negative electrode battery can consume at its corresponding discharge cutoff voltage. Thus, compared with the scheme of the graphite negative electrode battery, the silicon-oxygen negative electrode battery has higher capacity utilization rate.
Fig. 3 is a schematic block diagram of one embodiment of the protection circuit 3 of the silicon oxygen anode battery 1 shown in fig. 1. As shown in fig. 3, the protection circuit 3 includes a booster circuit 4 and a controller 5. The booster circuit 4 is electrically connected with the battery core 2. The controller 5 comprises a detection end 6 and a control end 7. The detection end 6 is electrically connected with the battery cell 2 and is used for detecting the output voltage of the battery cell 2; and the control end 7 is electrically connected with the booster circuit 4; the control terminal 7 controls the booster circuit 4 to be inactive when the output voltage of the battery cell 2 is in the high-voltage discharge voltage range, and controls the booster circuit 4 to boost the output voltage of the battery cell 2 when the output voltage of the battery cell 2 is in the low-voltage discharge voltage range lower than the high-voltage discharge voltage range. In this embodiment, the controller 5 detects the output voltage of the battery cell 2 in real time through the detection terminal 6. When the output voltage of the cell 2 is detected to be in the high-voltage discharge voltage range (for example, 4.45V to 3.3V), the load connected to the silicon-oxygen anode battery 1 can be operated normally. At this time, in some embodiments, the controller 5 pulls down the voltage electrically connected to the control terminal 7 of the booster circuit 4, disabling the booster circuit 4. When the output voltage of the battery cell 2 is detected to be in a low voltage discharge voltage range (for example, 3.3V-2.75V), the controller 5 pulls up the voltage of the control terminal 7, so that the booster circuit 4 operates. The boost circuit 4 may boost the output voltage of the cell 2 to continue to power the load. Therefore, when the output voltage of the battery cell 2 is in a low-voltage discharge voltage range, the normal power supply requirement of a load can be continuously ensured, and the capacity loss of the battery cell 2 is reduced. In addition, in the present embodiment, the high voltage discharge voltage range and the low voltage discharge voltage range are both relatively speaking, and are not particularly defined. The high-voltage discharge voltage range refers to a voltage range allowing the battery cell 2 to discharge under normal conditions, and meets the normal work of a load. The low-voltage discharge voltage range is a voltage range which is larger than the discharge cut-off voltage of the battery cell 2 of the silicon-oxygen cathode battery 1 and smaller than the load shutdown voltage.
In some embodiments, the protection circuit 3 further comprises an over-current protection circuit 8 and a switching circuit 9. The switching circuit 9 is electrically connected between the overcurrent protection circuit 8 and the battery cell 2. The over-current protection circuit 8 is used for controlling the switch circuit 9 to be turned off when the battery cell 2 is overcharged or overdischarged. In this embodiment, the overcurrent protection circuit 8 is used to control the switch circuit 9 to be turned off when the battery cell 2 is overcharged or overdischarged, so that the battery cell 2 stops charging or discharging. The overcurrent protection circuit 8 has the function of protecting the battery cell 2, and prolongs the service life of the battery cell 2.
Fig. 4 is a circuit diagram of the protection circuit 3 of the silicon oxygen anode battery 1 shown in fig. 3. As shown in connection with fig. 3 and 4, in some embodiments, the over-current protection circuit 8 includes a battery detection pin BS and a power supply pin VSS; the battery detection pin BS is electrically connected with the detection end 6; the power supply pin VSS is electrically connected between the battery cell 2 and the switch circuit 9; the controller 5 detects the output voltage of the battery cell 2 via the battery detection pin BS and the power supply pin VSS. In this embodiment, the detection terminal 6 of the controller 5 is electrically connected to the battery cell 2 through the over-current protection circuit 8 to realize detection of the output voltage of the battery cell 2. Thus, compared with the technical scheme that the detection end 6 in the related art is electrically connected with the output end of the protection circuit 3, the output voltage of the battery cell 2 is detected through the switch circuit 9, the controller 5 in the embodiment of the application can avoid the line impedance of the switch circuit 9, so that the detection precision of the output voltage of the battery cell 2 is improved.
In some embodiments, the over-current protection circuit 8 includes a first protection chip IC1 and a first discharge capacitor C1. The battery detection pin BS and the power supply pin VSS are provided in the first protection chip IC1. The overcurrent protection circuit 8 can realize overcurrent protection on the battery cell 2 through the first protection chip IC1. The first protection chip IC1 is a first-level protection chip and is also an active component protection chip. Compared with the related art, the first protection chip IC1 of the present application is provided with the battery detection pin BS. The battery detection pin BS can be electrically connected to the negative electrode of the battery cell 2 through the power supply pin VSS, so that the situation that the detection end 6 of the controller 5 can detect the output voltage of the battery cell 2 through the switch circuit 9 is avoided, and the accuracy of detecting the output voltage of the battery cell 2 by the controller 5 is higher. The first discharging capacitor C1 is electrically connected between the battery cell 2 and the power pin VSS, and is configured to supply power to the first protection chip IC1, so as to ensure normal operation of the first protection chip IC1.
In some embodiments, the over-current protection circuit 8 includes a second protection chip IC2 and a second discharge capacitor C2; the second protection chip IC2 includes a first power pin VSS1 electrically connected to the electrical core 2. In this embodiment, the overcurrent protection circuit 8 also realizes the overcurrent protection of the battery cell 2 through the second protection chip IC2, so that the overcurrent protection effect of the battery cell 2 is better. The second protection chip IC2 is a secondary protection chip, and is also a passive component protection chip. The second discharging capacitor C2 is electrically connected between the battery cell 2 and the first power pin VSS1, and is configured to supply power to the second protection chip IC2, so as to ensure normal operation of the second protection chip IC 2.
In some embodiments, the first protection chip IC1 includes a first charge output pin COUT1, and the second protection chip IC2 includes a second charge output pin COUT2. The switching circuit 9 comprises a third switching tube G3 and a fourth switching tube G4; the first charging output pin COUT1 is electrically connected to the control end of the third switching tube D3, and the second charging output pin COUT2 is electrically connected to the control end of the fourth switching tube. When the battery cell is overcharged, the first protection chip IC1 and the second protection chip IC2 control the third switching tube G3 and the fourth switching tube G4 to be turned off. The overcurrent protection circuit 8 realizes overcurrent protection on the battery cell 2 through a protection chip. The first protection chip IC1 performs an operation earlier than the second protection chip IC 2. Specifically, when the battery core 2 is in an overcharged state, the first protection chip IC1 controls the third switching tube G3 to be turned off through the first charging output pin COUT1, and then the second protection chip IC2 controls the fourth switching tube G3 to be turned off through the second charging output pin COUT2. In this way, the battery cell 2 can be prevented from continuing to be in the charged state, so as to prevent the battery cell 2 from being damaged due to overcharging. In some embodiments, the third switching tube G3 and the fourth switching tube G4 are N-type MOS tubes.
In some embodiments, the first protection chip IC1 includes a first discharge output pin DOUT1, and the second protection chip IC2 includes a second discharge output pin DOUT2. The switching circuit 9 includes a fifth switching tube G5 and a sixth switching tube G6; the first discharging output pin DOUT1 is electrically connected to the control end of the fifth switching tube G5, and the second discharging output pin DOUT2 is electrically connected to the control end of the sixth switching tube G6. When the battery cell 2 is overdischarged, the first protection chip IC1 and the second protection chip IC2 control the fifth switching tube G5 and the sixth switching tube G6 to be turned off. In this embodiment, when the battery cell 2 is in the overdischarge state, the first protection chip IC1 controls the fifth switching tube G5 to be turned off through the first discharge output pin DOUT1, and then the second protection chip IC2 controls the sixth switching tube G6 to be turned off through the second discharge output pin DOUT2. In this way, the cell 2 can be prevented from continuing to be in the discharge state, so as to prevent the cell 2 from being damaged due to overdischarge. In some embodiments, the fifth switching tube G5 and the sixth switching tube G6 are N-type MOS tubes.
In some embodiments, the over-current protection circuit includes a first current limiting resistor R1 and a second current limiting resistor R4. The first protection chip IC1 includes a chip operating voltage pin VDD. The second protection chip IC2 includes a first chip operating voltage VDD1. The first current limiting resistor R1 is electrically connected between the battery cell 2 and the chip operating voltage pin VDD, and is used for limiting the current input from the battery cell 2 to the first protection chip IC1. The second current limiting resistor R4 is electrically connected to the battery cell 2 and the first chip operating voltage VDD1, and is used for limiting the current input from the battery cell 2 to the second protection chip IC 2.
In some embodiments, the overcurrent protection circuit further includes a first sense resistor R2 and a second sense resistor R3. The first protection chip IC1 includes a voltage pin V-. The second protection chip IC2 includes a first voltage pin V1-. The first sense resistor R2 is connected in series between the voltage pin V-and the output 12. The second sense resistor R3 is connected in series between the first voltage pin V1-and the switching circuit 9. Whether the output terminal 12 is connected to the charger or not can be detected by both the first detection resistor R2 and the second detection resistor R3.
In some embodiments, the protection circuit 3 includes an output 12 and a current-backflow prevention circuit 10; the current backflow preventing circuit 10 is electrically connected between the battery cell 2 and the output end 12 and is electrically connected with the boost circuit 4, and is used for preventing current from flowing from the output end 12 to the battery cell 2 when the output voltage of the battery cell 2 is increased by the boost circuit 4, and communicating the battery cell 2 with the output end 12 when the output voltage of the battery cell 2 is in a high-voltage discharge voltage range. The output 12 may include a positive output p+ and a negative output P-. When the voltage boosting circuit 4 boosts the output voltage of the battery cell 2 and outputs the boosted voltage to the positive electrode output terminal p+, the voltage of the positive electrode output terminal p+ is greater than the voltage of the battery cell 2, which causes a problem that the voltage of the positive electrode output terminal p+ flows backward to the battery cell 2. Therefore, the current backflow prevention circuit 10 is arranged between the battery cell 2 and the positive electrode output end P+ to prevent the current from flowing backward from the positive electrode output end P+ to the battery cell 2 when the voltage of the positive electrode output end P+ is larger than that of the battery cell 2, so that the battery cell 2 is protected from being damaged easily.
In some embodiments, the current-backflow prevention circuit 10 includes a first switching tube G1 and a second switching tube G2 connected in series back-to-back, the second switching tube G2 being electrically connected between the first switching tube G1 and the output terminal 12. When the boost circuit 4 boosts the output voltage of the battery cell 2 and outputs the boosted voltage to the positive output terminal p+ of the output terminal 12, both the first switching tube G1 and the second switching tube G2 are in an off state, and since the first switching tube G1 and the second switching tube G2 are connected back-to-back in series, both the current flowing from the battery cell 2 to the first switching tube G1 and the current flowing from the positive output terminal p+ to the second switching tube G2 are cut off. Therefore, when the voltage of the positive electrode output end P+ is larger than the voltage of the battery cell 2, the purpose of preventing current from flowing backwards from the positive electrode output end P+ to the battery cell 2 is achieved.
The boost circuit 4 includes a boost input terminal Vin and a boost output terminal Vout, the boost input terminal Vin is electrically connected between the battery cell 2 and the first switching tube G1, the boost output terminal Vout is electrically connected with the output terminal 12, the boost circuit 4 includes an enable pin EN, and is electrically connected with the control terminal 7 of the controller 5. The boosting input end Vin is electrically connected with the battery core 2 before the first switching tube G1, so that the output voltage of the battery core 2 is directly boosted by the boosting circuit 4, and the electric efficiency of the output voltage of the battery core 2 is improved. The booster circuit 4 boosts the output voltage of the battery core 2 and outputs the boosted voltage to the positive output end P+ of the output end 12 through the boosting output end Vout, so as to further supply power to the whole machine. In addition, the enable pin EN is electrically connected with the control end 7, so that the controller 5 is electrically connected with the boost circuit 4, and the controller 5 is further convenient to control the boost circuit 4 through the enable pin EN.
In some embodiments, the boost circuit 4 includes, but is not limited to including, a charge pump. The boost circuit 4 boosts the output voltage of the battery core 2 through the charge pump and outputs the boosted voltage to the positive electrode output end P+, and compared with a scheme adopting a boost circuit, the boost circuit has higher boost efficiency. In some embodiments, the electrical efficiency of the charge pump may reach over 95%. In some embodiments, the output voltage of the battery cell 2 can be raised by 1.5 times by the charge pump. In some embodiments, the charge pump includes two switches SC connected in parallel, two capacitors C, and an N-type MOS transistor Q1. Two capacitors C are connected in parallel with the two switches SC, respectively. The source electrode of the N-type MOS tube Q1 is electrically connected with one of the switches SC, and the drain electrode is electrically connected with the battery core 2.
In some embodiments, the first switch tube G1 includes a first PMOS tube, the second switch tube G2 includes a second PMOS tube, a drain electrode of the first PMOS tube is electrically connected to the battery core 2, and a source electrode of the first PMOS tube is electrically connected to a source electrode of the second PMOS tube; the drain electrode of the second PMOS tube is electrically connected with the output end 12; the grid electrode of the first PMOS tube and the grid electrode of the second PMOS tube are electrically connected with the control end 7 of the controller 5. The first switching tube G1 and the second switching tube G2 are P-type MOS tubes. According to the characteristics of the low-voltage conduction and the high-voltage cut-off of the P-type MOS tube, when the booster circuit 4 outputs high voltage, the first switching tube G1 and the second switching tube G2 are both disconnected, so that the purpose of preventing current from flowing backward from the positive electrode output end P+ of the output end 12 to the battery cell 2 can be realized. In addition, the controller 5 is electrically connected to the common gate of the first switching tube G1 and the second switching tube G2 through the control terminal 7 to control the on or off of the first switching tube G1 and the second switching tube G2.
In some embodiments, the current backflow prevention circuit 10 includes a first diode D1 and a second diode D2; the anode of the first diode D1 and the source electrode of the first PMOS tube, and the cathode of the first diode D1 is electrically connected with the drain electrode of the first PMOS tube; the positive pole of the second diode D2 is electrically connected with the source electrode of the second PMOS tube, and the negative pole of the second diode D2 is electrically connected with the drain electrode of the second PMOS tube. The first diode D1 and the second diode D2 are parasitic diodes, and are used for preventing the first PMOS transistor and the second PMOS transistor from being broken down when the instantaneous reverse large current is generated in the circuit, so as to protect the first PMOS transistor and the second PMOS transistor. According to the diode having unidirectional conductivity, the cathode of the first diode D1 is electrically connected to the battery cell 2, and the cathode of the second diode D2 is electrically connected to the positive output terminal p+. Thus, when the voltage of the positive electrode output end P+ is larger than the voltage of the battery cell 2, the voltage at the positive electrode output end P+ is prevented from flowing backwards to the battery cell 2.
In some embodiments, the protection circuit 3 includes a temperature detection circuit 11 electrically connected between the battery cell 2 and the controller 5 for detecting the temperature of the battery cell 2. When the battery cell 2 is in a discharging state or a charging state, the temperature detection circuit 11 can detect the temperature of the battery cell 2 in real time and feed back to the controller 5. If the temperature of the battery cell 2 is too high, the controller 5 blocks the battery cell 2 from continuing to discharge or charge. In some embodiments, the temperature detection circuit 11 includes a thermistor NTC.
In some embodiments, the protection circuit 3 includes a precision resistor RS connected in series between the power pin VSS and the switch circuit 9 for detecting the current of the battery cell 2.
The foregoing description is only a preferred embodiment of the present application, and is not intended to limit the invention to the particular embodiment disclosed, but is not intended to limit the invention to the particular embodiment disclosed, as any and all modifications, equivalent to the above-described embodiment, may be made by one skilled in the art without departing from the scope of the invention.

Claims (11)

1. A protection circuit for a silicon-oxygen negative electrode battery, the silicon-oxygen negative electrode battery comprising a cell, the protection circuit comprising:
the booster circuit is electrically connected with the battery core; and
The controller comprises a detection end and a control end; the detection end is electrically connected with the battery cell and is used for detecting the output voltage of the battery cell; the control end is electrically connected with the boost circuit; and the control end controls the booster circuit to be not operated when the output voltage of the battery cell is in a high-voltage discharge voltage range, and controls the booster circuit to boost the output voltage of the battery cell when the output voltage of the battery cell is in a low-voltage discharge voltage range lower than the high-voltage discharge voltage range.
2. The protection circuit of claim 1, further comprising:
an overcurrent protection circuit;
the switch circuit is electrically connected between the overcurrent protection circuit and the battery cell;
the over-current protection circuit is used for controlling the switch circuit to be turned off when the battery cell is overcharged or overdischarged.
3. The protection circuit of claim 2, wherein the over-current protection circuit comprises a battery sense pin and a power pin; the battery detection pin is electrically connected with the detection end; the power supply pin is electrically connected between the battery cell and the switch circuit; the controller detects the output voltage of the battery cell through the battery detection pin and the power supply pin.
4. The protection circuit of claim 3, wherein the over-current protection circuit comprises a first protection chip and a first discharge capacitor; the battery detection pin and the power supply pin are arranged on the first protection chip; the first discharging capacitor is electrically connected between the battery cell and the power supply pin and is used for supplying power to the first protection chip; and
the overcurrent protection circuit comprises a second protection chip and a second discharge capacitor; the second protection chip comprises a first power supply pin which is electrically connected with the battery cell; the second discharging capacitor is electrically connected between the battery cell and the first power pin and is used for supplying power to the second protection chip.
5. The protection circuit of claim 2, wherein the protection circuit comprises an output and a current-sink prevention circuit; the current backflow prevention circuit is electrically connected between the battery cell and the output end and is electrically connected with the boost circuit, and is used for preventing current from flowing from the output end to the battery cell when the output voltage of the battery cell is increased by the boost circuit, and communicating the battery cell with the output end when the output voltage of the battery cell is in a high-voltage discharge voltage range.
6. The protection circuit of claim 5, wherein the current-back prevention circuit comprises a first switching tube and a second switching tube connected in series back-to-back, the second switching tube being electrically connected between the first switching tube and the output terminal;
the boost circuit comprises a boost input end and a boost output end, wherein the boost input end is electrically connected between the battery cell and the first switch tube, the boost output end is electrically connected with the output end, and the boost circuit comprises an enabling pin and is electrically connected with the control end of the controller.
7. The protection circuit of claim 6, wherein the first switching tube comprises a first PMOS tube, the second switching tube comprises a second PMOS tube, a drain electrode of the first PMOS tube is electrically connected to the battery cell, and a source electrode of the first PMOS tube is electrically connected to a source electrode of the second PMOS tube; the drain electrode of the second PMOS tube is electrically connected with the output end; the grid electrode of the first PMOS tube and the grid electrode of the second PMOS tube are electrically connected with the control end of the controller.
8. The protection circuit of claim 7, wherein the anti-current-back-flow circuit comprises a first diode and a second diode; the anode of the first diode and the source electrode of the first PMOS tube, and the cathode of the first diode is electrically connected with the drain electrode of the first PMOS tube; the anode of the second diode is electrically connected with the source electrode of the second PMOS tube, and the cathode of the second diode is electrically connected with the drain electrode of the second PMOS tube.
9. The protection circuit of claim 2, wherein the over-current protection circuit comprises a first protection chip and a second protection chip; the first protection chip comprises a first charging output pin, and the second protection chip comprises a second charging output pin;
the switching circuit comprises a third switching tube and a fourth switching tube; the first charging output pin is electrically connected with the control end of the third switching tube, and the second charging output pin is electrically connected with the control end of the fourth switching tube;
when the battery cell is overcharged, the first protection chip and the second protection chip control the third switching tube and the fourth switching tube to be turned off.
10. The protection circuit of claim 9, wherein the first protection chip comprises a first discharge output pin and the second protection chip comprises a second discharge output pin;
the switching circuit comprises a fifth switching tube and a sixth switching tube; the first discharging output pin is electrically connected with the control end of the fifth switching tube, and the second discharging output pin is electrically connected with the control end of the sixth switching tube;
when the battery cell is overdischarged, the first protection chip and the second protection chip control the fifth switching tube and the sixth switching tube to be turned off.
11. A silicon oxygen cathode battery is characterized by comprising an electric core; and
A protection circuit according to any one of claims 1 to 10, electrically connected between the positive and negative poles of the cell.
CN202111530391.4A 2021-12-14 2021-12-14 Protection circuit of silicon-oxygen negative electrode battery and silicon-oxygen negative electrode battery Pending CN116264407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111530391.4A CN116264407A (en) 2021-12-14 2021-12-14 Protection circuit of silicon-oxygen negative electrode battery and silicon-oxygen negative electrode battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111530391.4A CN116264407A (en) 2021-12-14 2021-12-14 Protection circuit of silicon-oxygen negative electrode battery and silicon-oxygen negative electrode battery

Publications (1)

Publication Number Publication Date
CN116264407A true CN116264407A (en) 2023-06-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111530391.4A Pending CN116264407A (en) 2021-12-14 2021-12-14 Protection circuit of silicon-oxygen negative electrode battery and silicon-oxygen negative electrode battery

Country Status (1)

Country Link
CN (1) CN116264407A (en)

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