CN219779800U - Lithium battery charge and discharge information acquisition control circuit - Google Patents
Lithium battery charge and discharge information acquisition control circuit Download PDFInfo
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- CN219779800U CN219779800U CN202320286408.4U CN202320286408U CN219779800U CN 219779800 U CN219779800 U CN 219779800U CN 202320286408 U CN202320286408 U CN 202320286408U CN 219779800 U CN219779800 U CN 219779800U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 292
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 292
- 238000002955 isolation Methods 0.000 claims abstract description 31
- 238000007599 discharging Methods 0.000 claims description 42
- 238000010586 diagram Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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Abstract
The utility model discloses a lithium battery charge and discharge information acquisition control circuit which comprises a first lithium battery information acquisition circuit, a second lithium battery information acquisition circuit, a signal isolation circuit, a controller and a communication circuit, wherein the charge and discharge information of a first lithium battery pack is acquired through the first lithium battery information acquisition circuit; the second lithium battery information acquisition circuit acquires charge and discharge information of the second lithium battery pack; the signal isolation circuit isolates and outputs signals of the second lithium battery information acquisition circuit; the controller acquires charge and discharge information of the first lithium battery pack and the second lithium battery pack through the first lithium battery information acquisition circuit and the signal isolation circuit; and the communication circuit transmits charge and discharge information of the first lithium battery pack and the second lithium battery pack to the outside. The information of the lithium battery packs can be acquired by adopting the two battery information acquisition circuits and the signal isolation circuit, and the information of the plurality of groups of lithium battery packs connected in series can be acquired and output to external equipment for display through a communication interface.
Description
Technical Field
The utility model relates to the technical field of lithium battery protection circuits, in particular to a lithium battery charge and discharge information acquisition control circuit.
Background
In recent years, secondary batteries such as lithium (Li) ion batteries have been widely used. After the lithium battery pack is discharged for one time, the lithium battery pack can be charged continuously in a charging mode, so that repeated recycling is realized. In the use process of the lithium battery pack, the state of the lithium battery pack is generally required to be collected so as to realize overcurrent and overvoltage protection of the lithium battery pack, and state information of the lithium battery pack is output to external display equipment to carry out information on the information of the lithium battery pack.
In the prior art, a single charge-discharge management chip is generally used for realizing the collection of information of the lithium battery pack, the voltage range of the lithium battery pack collected by the single charge-discharge management chip is limited, and when a plurality of groups of lithium battery packs are connected in series, the collection of the information of the lithium battery pack at a high voltage end cannot be performed.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present utility model is to provide a lithium battery charge and discharge information acquisition control circuit.
In order to achieve the above object, an embodiment of the present utility model provides a lithium battery charge and discharge information acquisition control circuit, including:
the first lithium battery information acquisition circuit is connected with the first lithium battery pack to acquire charge and discharge information of the first lithium battery pack;
the second lithium battery information acquisition circuit is connected with the second lithium battery pack to acquire charge and discharge information of the second lithium battery pack; the positive end of the first lithium battery pack is connected with the negative end of the second lithium battery pack in series;
the signal isolation circuit is connected with the second lithium battery information acquisition circuit to isolate and output signals of the second lithium battery information acquisition circuit;
the controller is respectively connected with the first lithium battery information acquisition circuit and the signal isolation circuit to acquire charge and discharge information of the first lithium battery pack and the second lithium battery pack through the first lithium battery information acquisition circuit and the signal isolation circuit;
and the communication circuit is connected with the controller to externally transmit the charge and discharge information of the first lithium battery pack and the second lithium battery pack.
Further, according to an embodiment of the present utility model, the lithium battery charge and discharge information acquisition control circuit further includes:
and the LED display circuit is connected with the controller to display charge and discharge information of the first lithium battery pack and the second lithium battery pack under the control of the controller.
Further, according to an embodiment of the present utility model, the LED display circuit includes:
the LED1, the negative pole of the said LED1 is connected with reference ground, the positive pole of the said LED is connected with control end of the said controller through the first resistance A1; the light emitting diode LED1 and the first resistor A1 are respectively provided with a plurality of light emitting diodes.
Further, according to an embodiment of the present utility model, the first lithium battery information acquisition circuit includes:
the lithium battery protection chip is respectively connected with each lithium battery of the first lithium battery pack to obtain charging and discharging information of each lithium battery;
and the charge-discharge switch circuit is connected with the charge-discharge control end of the first lithium battery protection chip so as to control the charge-discharge of the lithium battery pack under the action of the first lithium battery protection chip.
Further, according to an embodiment of the present utility model, the charge-discharge switching circuit includes:
the discharging control end of the discharging switch circuit is connected with the discharging control end of the first lithium battery protection chip, and the discharging switch circuit is also connected with the negative end of the first lithium battery pack so as to control the discharging of the first lithium battery pack and the second lithium battery pack;
and the charging control end of the charging switch circuit is connected with the charging control end of the first lithium battery protection chip, and the charging switch circuit is also connected with the discharging switch circuit so as to control the charging of the first lithium battery pack and the second lithium battery pack.
Further, according to an embodiment of the present utility model, the discharge switching circuit includes:
the source electrode of the first MOS tube M1 is connected with the negative end of the first lithium battery pack, and the drain electrode of the first MOS tube M1 is connected with the charging switch circuit;
the discharging switch driving circuit comprises a first diode D18, a first triode QT26 and a second triode QT29, wherein the anode of the first diode D18 is connected with a discharging control signal end of the first lithium battery protection chip, the cathode of the first diode D18 is connected with the grid electrode of the first MOS tube M1 through a second resistor RM2, the emitter of the first triode QT26 is connected with the cathode of the first diode D18, the collector of the first triode QT26 is connected with the source of the first MOS tube M1 through a third resistor R33, the base of the first triode QT26 is connected with the emitter of the second triode QT29, the collector of the first triode QT26 is connected with the source of the first MOS tube M1, the base of the first triode QT26 is connected with the anode of the first diode D18, and the base of the first triode QT26 is also connected with the source of the first MOS tube M1 through a fourth resistor M9.
Further, according to an embodiment of the present utility model, the discharge switching circuit includes:
the source electrode of the second MOS tube M2 is connected with the negative end of the charging and discharging interface, and the drain electrode of the second MOS tube M2 is connected with the drain electrode of the first MOS tube M1;
the charging switch driving circuit comprises a second diode D17, a third triode QT27 and a fourth triode QT30, wherein the anode of the second diode D17 is connected with a charging control signal end of the first lithium battery protection chip, the cathode of the second diode D17 is connected with the grid electrode of the second MOS tube M2 through a fifth resistor RM1, the emitter of the third triode QT27 is connected with the cathode of the second diode D17, the collector of the third triode QT27 is connected with the source electrode of the second MOS tube M2 through a sixth resistor R32, the base of the third triode QT27 is connected with the emitter of the fourth triode QT30, the collector of the fourth triode QT30 is connected with the source electrode of the second MOS tube M2, the base of the fourth triode QT30 is connected with the anode of the second diode D17, and the base of the fourth triode QT30 is also connected with the source electrode of the second MOS tube M2 through a sixth resistor M8.
Further, according to an embodiment of the present utility model, the discharge switching circuit further includes: the anode of the second diode D17 is connected with the charging control signal end of the first lithium battery protection chip through the fifth triode QT23 and the third diode D15; the cathode of the third diode D15 is connected with the anode of the second diode D17, the anode of the third diode D15 is connected with the collector of the fifth triode QT23, the emitter of the fifth triode QT23 is connected with the charging control signal end of the first lithium battery protection chip through an eighth resistor RA29, the base of the fifth triode QT23 is connected with the reference ground through a ninth resistor RF3, and the base of the fifth triode QT23 is also connected with the collector of the fifth triode QT23 through a tenth resistor RE 14.
Further, according to an embodiment of the present utility model, the second lithium battery information acquisition circuit includes:
the second lithium battery protection chip is respectively connected with each lithium battery of the second lithium battery pack to acquire charging and discharging information of each lithium battery, and the second lithium battery protection chip also transmits the charging and discharging information of each lithium battery to the controller through the signal isolation circuit and controls the first lithium battery protection chip to conduct charging and discharging control on the lithium battery pack through the controller.
Further, according to an embodiment of the present utility model, the signal isolation circuit includes:
the first signal input and output end of the signal isolator is connected with the communication interface of the second lithium battery protection chip, the second signal input and output end of the signal isolator is connected with the first communication interface of the controller, and the second communication interface of the controller is connected with the first lithium battery protection chip.
The lithium battery charge and discharge information acquisition control circuit provided by the embodiment of the utility model is connected with the first lithium battery pack through the first lithium battery information acquisition circuit so as to acquire charge and discharge information of the first lithium battery pack; the second lithium battery information acquisition circuit is connected with the second lithium battery pack to acquire charge and discharge information of the second lithium battery pack; the positive end of the first lithium battery pack is connected with the negative end of the second lithium battery pack in series; the signal isolation circuit is connected with the second lithium battery information acquisition circuit to isolate and output signals of the second lithium battery information acquisition circuit; the controller is respectively connected with the first lithium battery information acquisition circuit and the signal isolation circuit to acquire charge and discharge information of the first lithium battery pack and the second lithium battery pack through the first lithium battery information acquisition circuit and the signal isolation circuit; and the communication circuit is connected with the controller to externally transmit the charge and discharge information of the first lithium battery pack and the second lithium battery pack. Therefore, the information of the lithium battery packs is acquired by adopting the two battery information acquisition circuits and the signal isolation circuit, and the information of the plurality of groups of lithium battery packs connected in series can be acquired and output to external equipment for display through the communication interface.
Drawings
Fig. 1 is a block diagram of a lithium battery charge and discharge information acquisition control circuit according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a first lithium battery information acquisition circuit according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a charge-discharge switch circuit according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a second lithium battery information acquisition circuit according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a signal isolation circuit according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of a circuit structure of a controller according to an embodiment of the present utility model;
FIG. 7 is a schematic diagram of a key and LED circuit structure according to an embodiment of the present utility model;
fig. 8 is a schematic diagram of a 485 communication circuit according to an embodiment of the utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to enable those skilled in the art to better understand the present utility model, the following description will make clear and complete descriptions of the technical solutions according to the embodiments of the present utility model with reference to the accompanying drawings. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, an embodiment of the present utility model provides a lithium battery charging and discharging information acquisition control circuit, including: the system comprises a first lithium battery information acquisition circuit, a second lithium battery information acquisition circuit, a signal isolation circuit, a controller and a communication circuit, wherein the first lithium battery information acquisition circuit is connected with a first lithium battery pack to acquire charge and discharge information of the first lithium battery pack; specifically, as shown in fig. 2 and 3, the first lithium battery information acquisition circuit includes: the lithium battery protection device comprises a first lithium battery protection chip U8 and a charge-discharge switch circuit, wherein the first lithium battery protection chip U8 is respectively connected with each lithium battery of the first lithium battery pack to acquire charge-discharge information of each lithium battery; the voltage detection terminals VC 0-VC 10 of the first lithium battery protection chip U8 are respectively connected with each lithium battery in the first lithium battery pack so as to detect the voltage of charging and discharging each lithium battery and realize overcharge and over-charge detection, protection control and information acquisition of the lithium battery pack.
The charging and discharging switch circuit is connected with the charging and discharging control end of the first lithium battery protection chip U8 so as to control charging and discharging of the lithium battery pack under the action of the first lithium battery protection chip U8. The first lithium battery protection chip U8 performs full electric voltage detection on the first lithium battery pack, and can acquire the charge and discharge states of each lithium battery, and when one lithium battery is overcharged or overdischarged, a control signal is output to the charge and discharge switch circuit through the charge control terminal CHGM or the discharge control terminal GSGDM so as to perform charge and discharge on-off control on the charge and discharge switch circuit.
The second lithium battery information acquisition circuit is connected with the second lithium battery pack to acquire charge and discharge information of the second lithium battery pack; the positive end of the first lithium battery pack is connected with the negative end of the second lithium battery pack in series; as shown in fig. 1, the first lithium battery pack and the second lithium battery pack are connected in series with each other. The battery pack is powered externally, the voltage information of each lithium battery in the low voltage section of the first lithium battery information acquisition circuit is obtained, and the voltage information of each lithium battery in the high voltage section of the second lithium battery information acquisition circuit is obtained. As shown in fig. 4, the second lithium battery information acquisition circuit includes: the second lithium battery protection chip U3, the second lithium battery protection chip U3 is respectively connected with each lithium battery of the second lithium battery pack to obtain charging and discharging information of each lithium battery, the voltage detection ends VC 0-VC 10 of the second lithium battery protection chip U3 are respectively connected with each lithium battery, and the voltage detection of charging and discharging of each lithium battery in the second lithium battery pack is used for realizing overcharge and over-charge detection, protection control and information acquisition of the lithium battery pack.
The second lithium battery protection chip U3 also transmits charge and discharge information of each lithium battery to the controller U4A through the signal isolation circuit, and controls the first lithium battery protection chip U8 to perform charge and discharge control on the lithium battery pack through the controller U4A. The signal isolation circuit is connected with the second lithium battery information acquisition circuit to isolate and output signals of the second lithium battery information acquisition circuit; because the first lithium battery protection chip and the second lithium battery protection chip U3 are respectively in different voltage potentials, the first lithium battery protection chip U8 and the controller U4A are in the same level point position, data can be directly transmitted to the controller U4A, the second lithium battery protection chip U3 is in a high point position, the data cannot be directly output to the controller U4A, and isolation output is required through the isolation circuit. The controller U4A is respectively connected with the first lithium battery information acquisition circuit and the signal isolation circuit to acquire charge and discharge information of the first lithium battery pack and the second lithium battery pack through the first lithium battery information acquisition circuit and the signal isolation circuit; as shown in fig. 5 and 6, the signal isolation circuit includes: the signal isolator U6, the first signal input/output end of signal isolator U6 with communication interface (SDAS, SDLS) of second lithium cell protection chip U3 is connected, the second signal input/output end of signal isolator U6 with the first communication interface (SDAISO, SDLISO) of controller U4A, the second communication interface (SDAM, SDLM) of controller with first lithium cell protection chip U8 is connected, like this, controller U4A can respectively with first lithium cell protection chip U8 and second lithium cell protection chip U3 carry out data communication, thereby can acquire the charge-discharge information of first lithium cell group and second lithium cell group.
And the communication circuit is connected with the controller to externally transmit the charge and discharge information of the first lithium battery pack and the second lithium battery pack. As shown in fig. 8, the communication circuit may include a 485 communication circuit. In addition, the communication circuit may also be a CAN circuit, so that the controller may receive a 485 protocol signal or a CAN protocol signal. For example, the data is transmitted to the peripheral device through 485 protocol signals or CAN protocol signals, and the electric quantity and charge and discharge information of the lithium battery pack are displayed through the peripheral device.
The lithium battery charge and discharge information acquisition control circuit provided by the embodiment of the utility model is connected with the first lithium battery pack through the first lithium battery information acquisition circuit so as to acquire charge and discharge information of the first lithium battery pack; the second lithium battery information acquisition circuit is connected with the second lithium battery pack to acquire charge and discharge information of the second lithium battery pack; the positive end of the first lithium battery pack is connected with the negative end of the second lithium battery pack in series; the signal isolation circuit is connected with the second lithium battery information acquisition circuit to isolate and output signals of the second lithium battery information acquisition circuit; the controller is respectively connected with the first lithium battery information acquisition circuit and the signal isolation circuit to acquire charge and discharge information of the first lithium battery pack and the second lithium battery pack through the first lithium battery information acquisition circuit and the signal isolation circuit; and the communication circuit is connected with the controller to externally transmit the charge and discharge information of the first lithium battery pack and the second lithium battery pack. Therefore, the information of the lithium battery packs is acquired by adopting the two battery information acquisition circuits and the signal isolation circuit, and the information of the plurality of groups of lithium battery packs connected in series can be acquired and output to external equipment for display through the communication interface.
Referring to fig. 1 and 7, the lithium battery charge and discharge information acquisition control circuit further includes: and the LED display circuit is connected with the controller to display charge and discharge information of the first lithium battery pack and the second lithium battery pack under the control of the controller. The electric quantity and charge and discharge information of the first lithium battery pack and the second lithium battery pack can be output to peripheral equipment through the controller U4A and the communication circuit, and besides the display of the electric quantity and charge and discharge information of the lithium battery packs, the display of the electric quantity information can also be performed through the LED display circuit. As shown in fig. 7, the LED display circuit includes: the LED1, the negative pole of the said LED1 is connected with reference ground, the positive pole of the said LED is connected with control end of the said controller through the first resistance A1; the light emitting diode LED1 and the first resistor A1 are respectively provided with a plurality of light emitting diodes. Each of the light emitting diodes (LED 1 to LED 5) may be turned on or off under the control of the controller U4A, and the electric quantity information may be displayed. For example, when all lamps are on, the first lithium battery pack and the second lithium battery pack are indicated to be in a full-power state, and when all lamps are off, the first lithium battery pack and the second lithium battery pack are indicated to be in a no-power state.
Referring to fig. 3, the charge-discharge switching circuit includes: the discharging control end of the discharging switch circuit is connected with the discharging control end of the first lithium battery protection chip U8, and the discharging switch circuit is also connected with the negative end of the first lithium battery pack so as to control the discharging of the first lithium battery pack and the second lithium battery pack.
Specifically, as shown in fig. 3, the discharge switching circuit includes: the lithium battery pack comprises a first MOS tube M1 and a discharge switch driving circuit, wherein a source electrode of the first MOS tube M1 is connected with a negative end of the first lithium battery pack, and a drain electrode of the first MOS tube M1 is connected with the charge switch circuit; the first MOS tube M1 is provided with a plurality of MOS tubes (M1, M4, M6, M8, M10 and M12) which are connected in parallel. This increases the amount of current in the discharge loop. The grids of the MOS tubes (M1, M4, M6, M8, M10 and M12) are respectively connected with the discharge control signal end of the first lithium battery protection chip U8 so as to be conducted or cut off under the action of the discharge control signal, so that the discharge of the first lithium battery pack and the second lithium battery pack is controlled. More specifically, as shown in fig. 3, the discharge switch driving circuit includes a first diode D18, a first triode QT26, and a second triode QT29, wherein an anode of the first diode D18 is connected to a discharge control signal terminal of the first lithium battery protection chip, a cathode of the first diode D18 is connected to a gate of the first MOS transistor M1 through a second resistor RM2, an emitter of the first triode QT26 is connected to a cathode of the first diode D18, a collector of the first triode QT26 is connected to a source of the first MOS transistor M1 through a third resistor R33, a base of the first triode QT26 is connected to an emitter of the second triode QT29, a collector of the first triode QT26 is connected to a source of the first MOS transistor M1, a base of the first triode QT26 is connected to an anode of the first diode D18, and a base of the first triode QT26 is further connected to the source of the first MOS transistor M1 through a fourth resistor M9. The working process is that the first lithium battery protection chip U8 can output a discharge control signal through a discharge control terminal DGDM, when the discharge control signal DGDM is high-level voltage, the high level is output to the grid electrodes of the MOS tubes (M1, M4, M6, M8, M10 and M12) through a first diode D18, and the grid electrodes of the MOS tubes (M1, M4, M6, M8, M10 and M12) can be conducted. At this time, the lithium battery pack discharges outside through the MOS transistors (M1, M4, M6, M8, M10 and M12) and the charging switch circuit; in contrast, when the discharge control signal DGDM is low-level voltage, the low level can enable the gates of the MOS transistors (M1, M4, M6, M8, M10, M12) to be turned off, and at this time, the MOS transistors (M1, M4, M6, M8, M10, M12) are rapidly discharged through the first triode QT26 and the second triode QT29, so that the MOS transistors (M1, M4, M6, M8, M10, M12) can be rapidly turned off, and the lithium battery pack stops discharging.
Referring to fig. 2 and 3, the charging control end of the charging switch circuit is connected with the charging control end of the first lithium battery protection chip, and the charging switch circuit is further connected with the discharging switch circuit to control the charging of the first lithium battery pack and the second lithium battery pack. Specifically, as shown in fig. 3, the discharge switching circuit includes: the charging device comprises a first MOS tube M1, a charging switch driving circuit and a second MOS tube M2, wherein a source electrode of the first MOS tube M2 is connected with a drain electrode of a charging and discharging interface, and a drain electrode of the first MOS tube M1 is connected with a drain electrode of the charging and discharging interface; the second MOS tube M2 is provided with a plurality of MOS tubes (M2, M3, M7, M9, M11 and M13) which are connected in parallel. This increases the amount of current in the charging loop. The grids of the MOS tubes (M2, M3, M7, M9, M11 and M13) are respectively connected with the charging control signal end of the first lithium battery protection chip U8 so as to be conducted or cut off under the action of the charging control signal, so that the charging of the first lithium battery pack and the second lithium battery pack is controlled. More specifically, as shown in fig. 3, the charging switch driving circuit includes a second diode D17, a third triode QT27, and a fourth triode QT30, where an anode of the second diode D17 is connected to a charging control signal terminal of the first lithium battery protection chip, a cathode of the second diode D17 is connected to a gate of the second MOS transistor M2 through a fifth resistor RM1, an emitter of the third triode QT27 is connected to a cathode of the second diode D17, a collector of the third triode QT27 is connected to a source of the second MOS transistor M2 through a sixth resistor R32, a base of the third triode QT27 is connected to an emitter of the fourth triode QT30, a collector of the fourth triode QT30 is connected to a source of the second MOS transistor M2, a base of the fourth triode QT30 is connected to an anode of the second MOS transistor D17, and a base of the fourth triode QT30 is also connected to a source of the second MOS transistor M2 through a sixth resistor R32. The working process is that the first lithium battery protection chip U8 can output a charging control signal through the charging control terminal CHGM2, when the charging control signal CHGM2 is in a high level voltage, the high level is output to the grid electrodes of the MOS tubes (M2, M3, M7, M9, M11 and M13) through the second diode D17, so that the grid electrodes of the MOS tubes (M2, M3, M7, M9, M11 and M13) are conducted. At this time, the external input power supply charges the lithium battery pack through the MOS transistors (M2, M3, M7, M9, M11 and M13) and the discharge switch circuit; in contrast, when the charge control signal CHGM2 is a low level voltage, the low level may enable the gates of the MOS transistors (M2, M3, M7, M9, M11, M13) to be turned off, and the MOS transistors (M2, M3, M7, M9, M11, M13) rapidly discharge through the third transistor QT27 and the fourth transistor QT30, so that the MOS transistors (M2, M3, M7, M9, M11, M13) may be rapidly turned off, and the charging power supply stops charging the lithium battery pack.
Referring to fig. 3, in another embodiment of the present utility model, the discharge switching circuit further includes: the anode of the second diode D17 is connected with the charging control signal end of the first lithium battery protection chip through the fifth triode QT23 and the third diode D15; the cathode of the third diode D15 is connected with the anode of the second diode D17, the anode of the third diode D15 is connected with the collector of the fifth triode QT23, the emitter of the fifth triode QT23 is connected with the charging control signal end of the first lithium battery protection chip through an eighth resistor RA29, the base of the fifth triode QT23 is connected with the reference ground through a ninth resistor RF3, and the base of the fifth triode QT23 is also connected with the collector of the fifth triode QT23 through a tenth resistor RE 14. The working process of the lithium battery protection chip U8 is that the first lithium battery protection chip U8 can output a charging control signal through a charging control terminal CHGM, when the charging control signal CHGM is in high-level voltage, the high level enables a fifth triode QT23 to be conducted, and the fifth triode QT is output to the grid of the MOS tube (M2, M3, M7, M9, M11, M13) through a second diode D17, so that the grid of the MOS tube (M2, M3, M7, M9, M11, M13) is conducted. At this time, the external input power supply charges the lithium battery pack through the MOS transistors (M2, M3, M7, M9, M11 and M13) and the discharge switch circuit; in contrast, when the charge control signal CHGM2 is a low level voltage, the low level may enable the gates of the MOS transistors (M2, M3, M7, M9, M11, M13) to be turned off, and the MOS transistors (M2, M3, M7, M9, M11, M13) rapidly discharge through the third transistor QT27 and the fourth transistor QT30, so that the MOS transistors (M2, M3, M7, M9, M11, M13) may be rapidly turned off, and the charging power supply stops charging the lithium battery pack.
Although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that the present utility model may be modified or equivalents substituted for some of the features thereof. All equivalent structures made by the content of the specification and the drawings of the utility model are directly or indirectly applied to other related technical fields, and are also within the scope of the utility model.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model.
Claims (10)
1. The utility model provides a lithium cell charge and discharge information acquisition control circuit which characterized in that includes:
the first lithium battery information acquisition circuit is connected with the first lithium battery pack to acquire charge and discharge information of the first lithium battery pack;
the second lithium battery information acquisition circuit is connected with the second lithium battery pack to acquire charge and discharge information of the second lithium battery pack; the positive end of the first lithium battery pack is connected with the negative end of the second lithium battery pack in series;
the signal isolation circuit is connected with the second lithium battery information acquisition circuit to isolate and output signals of the second lithium battery information acquisition circuit;
the controller is respectively connected with the first lithium battery information acquisition circuit and the signal isolation circuit to acquire charge and discharge information of the first lithium battery pack and the second lithium battery pack through the first lithium battery information acquisition circuit and the signal isolation circuit;
and the communication circuit is connected with the controller to externally transmit the charge and discharge information of the first lithium battery pack and the second lithium battery pack.
2. The lithium battery charge and discharge information acquisition control circuit according to claim 1, further comprising:
and the LED display circuit is connected with the controller to display charge and discharge information of the first lithium battery pack and the second lithium battery pack under the control of the controller.
3. The lithium battery charge and discharge information acquisition control circuit according to claim 2, wherein the LED display circuit comprises:
the LED (LED 1) is characterized in that the cathode of the LED (LED 1) is connected with the reference ground, and the anode of the LED is connected with the control end of the controller through a first resistor (A1); the light emitting diode (LED 1) and the first resistor (A1) are respectively provided with a plurality of light emitting diodes.
4. The lithium battery charge and discharge information acquisition control circuit according to claim 1, wherein the first lithium battery information acquisition circuit comprises:
the lithium battery protection chip is respectively connected with each lithium battery of the first lithium battery pack to obtain charging and discharging information of each lithium battery;
and the charge-discharge switch circuit is connected with the charge-discharge control end of the first lithium battery protection chip so as to control the charge-discharge of the lithium battery pack under the action of the first lithium battery protection chip.
5. The lithium battery charge and discharge information acquisition control circuit according to claim 4, wherein the charge and discharge switching circuit comprises:
the discharging control end of the discharging switch circuit is connected with the discharging control end of the first lithium battery protection chip, and the discharging switch circuit is also connected with the negative end of the first lithium battery pack so as to control the discharging of the first lithium battery pack and the second lithium battery pack;
and the charging control end of the charging switch circuit is connected with the charging control end of the first lithium battery protection chip, and the charging switch circuit is also connected with the discharging switch circuit so as to control the charging of the first lithium battery pack and the second lithium battery pack.
6. The lithium battery charge and discharge information acquisition control circuit according to claim 5, wherein the discharge switching circuit comprises:
the source electrode of the first MOS tube (M1) is connected with the negative end of the first lithium battery pack, and the drain electrode of the first MOS tube (M1) is connected with the charging switch circuit;
the discharging switch driving circuit comprises a first diode (D18), a first triode (QT 26) and a second triode (QT 29), wherein the anode of the first diode (D18) is connected with a discharging control signal end of a first lithium battery protection chip, the cathode of the first diode (D18) is connected with the grid of a first MOS (M1) through a second resistor (RM 2), the emitter of the first triode (QT 26) is connected with the cathode of the first diode (D18), the collector of the first triode (QT 26) is connected with the source of the first MOS (M1) through a third resistor (R33), the base of the first triode (QT 26) is connected with the emitter of the second MOS (QT 29), the collector of the first triode (QT 26) is connected with the source of the first MOS (M1), and the collector of the first triode (QT 26) is connected with the source of the first MOS (M1) through the third resistor (R33).
7. The lithium battery charge-discharge information acquisition control circuit of claim 6, wherein the discharge switching circuit comprises:
the source electrode of the second MOS tube (M2) is connected with the negative end of the charging and discharging interface, and the drain electrode of the second MOS tube (M2) is connected with the drain electrode of the first MOS tube (M1);
the charging switch driving circuit comprises a second diode (D17), a third triode (QT 27) and a fourth triode (QT 30), wherein the anode of the second diode (D17) is connected with a charging control signal end of the first lithium battery protection chip, the cathode of the second diode (D17) is connected with the grid of the second MOS tube (M2) through a fifth resistor (RM 1), the emitter of the third triode (QT 27) is connected with the cathode of the second diode (D17), the collector of the third triode (QT 27) is connected with the source of the second MOS tube (M2) through a sixth resistor (R32), the base of the third triode (QT 27) is connected with the emitter of the fourth triode (QT 30), the collector of the fourth triode (QT 30) is connected with the source of the second MOS tube (M2), and the collector of the fourth triode (QT 30) is connected with the source of the fourth MOS tube (M2) through a third resistor (R32).
8. The lithium battery charge-discharge information acquisition control circuit of claim 7, wherein the discharge switching circuit further comprises: a fifth triode (QT 23) and a third diode (D15), wherein the anode of the second diode (D17) is connected with the charging control signal end of the first lithium battery protection chip through the fifth triode (QT 23) and the third diode (D15); the cathode of the third diode (D15) is connected with the anode of the second diode (D17), the anode of the third diode (D15) is connected with the collector of the fifth triode (QT 23), the emitter of the fifth triode (QT 23) is connected with the charging control signal end of the first lithium battery protection chip through an eighth resistor (RA 29), the base of the fifth triode (QT 23) is connected with the reference ground through a ninth resistor (RF 3), and the base of the fifth triode (QT 23) is also connected with the collector of the fifth triode (QT 23) through a tenth resistor (RE 14).
9. The lithium battery charge and discharge information acquisition control circuit according to claim 4, wherein the second lithium battery information acquisition circuit comprises:
the second lithium battery protection chip is respectively connected with each lithium battery of the second lithium battery pack to acquire charging and discharging information of each lithium battery, and the second lithium battery protection chip also transmits the charging and discharging information of each lithium battery to the controller through the signal isolation circuit and controls the first lithium battery protection chip to conduct charging and discharging control on the lithium battery pack through the controller.
10. The lithium battery charge and discharge information acquisition control circuit according to claim 9, wherein the signal isolation circuit comprises:
the first signal input and output end of the signal isolator is connected with the communication interface of the second lithium battery protection chip, the second signal input and output end of the signal isolator is connected with the first communication interface of the controller, and the second communication interface of the controller is connected with the first lithium battery protection chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320286408.4U CN219779800U (en) | 2023-02-10 | 2023-02-10 | Lithium battery charge and discharge information acquisition control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320286408.4U CN219779800U (en) | 2023-02-10 | 2023-02-10 | Lithium battery charge and discharge information acquisition control circuit |
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