CN220797851U - Lithium battery float charging alarm control circuit - Google Patents
Lithium battery float charging alarm control circuit Download PDFInfo
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- CN220797851U CN220797851U CN202322503612.XU CN202322503612U CN220797851U CN 220797851 U CN220797851 U CN 220797851U CN 202322503612 U CN202322503612 U CN 202322503612U CN 220797851 U CN220797851 U CN 220797851U
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- electrically connected
- protection control
- mos tube
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 53
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000004146 energy storage Methods 0.000 claims description 4
- 206010063385 Intellectualisation Diseases 0.000 abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Abstract
The utility model discloses a lithium battery float charge alarm control circuit, which comprises: discharge protection control MOS transistor Q5, charge protection control MOS transistor Q6, triode Q3 and triode Q4; the grid electrode of the discharge protection control MOS tube Q5 is electrically connected with a discharge control end DSG of the battery pack BMS, the source electrode of the discharge protection control MOS tube Q5 is respectively and electrically connected with a cathode B-of the lithium battery cell and the base electrode of the triode Q3, and the drain electrode of the discharge protection control MOS tube Q5 is electrically connected with the drain electrode of the charge protection control MOS tube Q6; the grid electrode of the charging protection control MOS tube Q6 is electrically connected with a battery pack BMS charging control end CHG, the source electrode of the charging protection control MOS tube Q6 is respectively electrically connected with the negative electrode P-of the battery pack charging port and the emitter electrode of the triode Q3, and the drain electrode of the charging protection control MOS tube Q5 is electrically connected with the drain electrode of the discharging protection control MOS tube. The utility model can automatically output the charge state alarm, realize the intellectualization of the work of the electronic product, and has simple circuit, low power consumption and low cost.
Description
Technical Field
The utility model belongs to the technical field of lithium ion battery management systems, and particularly relates to a lithium battery floating charge alarm control circuit.
Background
The lithium ion battery pack is increasingly widely applied to daily electricity exchange, including electricity exchange application of electric bicycles and electric automobiles. The user puts into the low-power battery group and charges in the power conversion station, takes away full battery group in the power conversion station simultaneously and uses, and the low-power battery group can be replaced by the next user after charging, takes out the installation and use, reduces the waiting time of user's charging.
In management of lithium battery pack charging stations, the full charge state of a lithium battery is usually automatically powered off after overvoltage protection of the lithium battery, but a user cannot intuitively judge whether the current lithium battery is fully charged.
Disclosure of utility model
In order to solve the technical problems, the utility model provides a lithium battery floating charge alarm control circuit.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the utility model discloses a lithium battery float charge alarm control circuit, which comprises: discharge protection control MOS transistor Q5, charge protection control MOS transistor Q6, triode Q3 and triode Q4;
the grid electrode of the discharge protection control MOS tube Q5 is electrically connected with a discharge control end DSG of the battery pack BMS, the source electrode of the discharge protection control MOS tube Q5 is respectively and electrically connected with a cathode B-of the lithium battery cell and the base electrode of the triode Q3, and the drain electrode of the discharge protection control MOS tube Q5 is electrically connected with the drain electrode of the charge protection control MOS tube Q6;
the grid electrode of the charging protection control MOS tube Q6 is electrically connected with a battery pack BMS charging control end CHG, the source electrode of the charging protection control MOS tube Q6 is respectively electrically connected with the negative electrode P-of a battery pack charging port and the emitter electrode of the triode Q3, and the drain electrode of the charging protection control MOS tube Q6 is electrically connected with the drain electrode of the discharging protection control MOS tube Q5;
The base electrode of the triode Q3 is respectively and electrically connected with the cathode B-of the lithium battery cell and the source electrode of the discharge protection control MOS tube Q5, the emitter electrode of the triode Q3 is respectively and electrically connected with the cathode P-of the charging port of the battery pack and the source electrode of the charge protection control MOS tube Q6, and the collector electrode of the triode Q3 is electrically connected with the base electrode of the triode Q4;
the base of the triode Q4 is electrically connected with the collector of the triode Q3, the emitter of the triode Q is electrically connected with the power supply VDD, and the collector of the triode Q is electrically connected with the signal output end OUT.
On the basis of the technical scheme, the following improvement can be made:
Preferably, the base of the transistor Q3 is electrically connected to the negative electrode B of the lithium cell via at least one resistor.
Preferably, the collector of transistor Q3 is electrically connected to the base of transistor Q4 via at least one resistor.
Preferably, the collector of transistor Q4 is electrically connected to signal output OUT via at least one resistor.
As a preferred scheme, the lithium battery float charge alarm control circuit further comprises: the self-locking circuit, the self-locking circuit includes: reset switch SW1, transistor Q2, transistor Q7, MOS transistor Q8, and transistor Q9;
one end of the reset switch SW1 is grounded, and the other end of the reset switch SW1 is electrically connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 through a resistor R2 and the collector electrode of the triode Q1 through a resistor R3 respectively;
The base electrode of the triode Q1 is electrically connected with the collector electrode of the triode Q2 through a resistor R4, is grounded through a resistor R5, is electrically connected with the collector electrode of the triode Q9 and is electrically connected with the base electrode of the triode Q7, the collector electrode of the triode Q1 is electrically connected with the base electrode of the triode Q2 through a resistor R3, and the emitter electrode of the triode Q1 is respectively grounded and is electrically connected with the negative electrode B-of the lithium battery core;
The base electrode of the triode Q2 is electrically connected with the reset switch SW1, the emitter electrode of the triode Q2 is electrically connected with the base electrode of the triode Q2 through a resistor R2, and the collector electrode of the triode Q2 is electrically connected with the base electrode of the triode Q1 through a resistor R4;
The base electrode of the triode Q9 is respectively and electrically connected with the grid electrode of the charging protection control MOS tube Q6 and the charging control end CHG of the battery pack BMS, the collector electrode of the triode Q9 is electrically connected with the base electrode of the triode Q7, and the emitter electrode of the triode is grounded;
The base electrode of the triode Q7 is electrically connected with the collector electrode of the triode Q9, the collector electrodes of the triode Q7 are respectively electrically connected with the power supply VDD and the grid electrode of the MOS tube Q8, and the emitter electrode of the triode Q8 is grounded;
The grid electrode of the MOS transistor Q8 is electrically connected with the collector electrode of the triode Q7, the source electrode of the MOS transistor Q8 is electrically connected with the power supply VDD, and the drain electrode of the MOS transistor Q8 is respectively electrically connected with the base electrode of the triode Q4 and the collector electrode of the triode Q3.
Preferably, the emitter of transistor Q2 is electrically connected to power supply VDD via at least one resistor.
Preferably, the emitter of transistor Q2 is also grounded via at least one bypass capacitor.
Preferably, the base of the transistor Q1 is also grounded through at least one energy storage capacitor.
Preferably, the base electrode of the triode Q7 is electrically connected with the grid electrode of the MOS tube Q8 through at least one resistor.
Preferably, at least one resistor of the emitter of the triode Q1 is electrically connected with the negative electrode B-of the lithium battery cell.
The utility model discloses a lithium battery float charge alarm control circuit, which has the following beneficial effects:
Firstly, through the voltage difference between the negative electrode P-of the charging port of the lithium battery pack and the negative electrode B-of the lithium battery core after the lithium battery pack is fully charged for protection, the automatic triggering of the alarm signal is realized, and the fully charged alarm signal is output after the lithium battery pack is fully charged.
Secondly, the key reset signal is locked through the self-locking circuit, the function of clearing the alarm signal is realized, a user can intuitively know the charging state of the battery pack by looking at the alarm signal prompt, and the alarm signal can be cleared through the reset key.
Thirdly, the utility model can automatically output the charge state alarm, thereby realizing the intellectualization of the work of the electronic product, and has simple circuit, low power consumption and low cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a lithium battery float charge alarm control circuit according to an embodiment of the present utility model.
Detailed Description
Preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The expression "comprising" an element is an "open" expression which merely means that the corresponding component is present and should not be interpreted as excluding additional components.
In order to achieve the object of the present utility model, in some embodiments of the present utility model, as shown in fig. 1, a lithium battery float charge alarm control circuit includes: discharge protection control MOS transistor Q5, charge protection control MOS transistor Q6, triode Q3 and triode Q4.
The grid electrode of the discharge protection control MOS tube Q5 is electrically connected with a discharge control end DSG of the battery pack BMS, the source electrode of the discharge protection control MOS tube Q5 is electrically connected with a negative electrode B-of the lithium battery cell, and is electrically connected with the base electrode of the triode Q3 through a resistor R8, and the drain electrode of the discharge protection control MOS tube Q5 is electrically connected with the drain electrode of the charge protection control MOS tube Q6;
the grid electrode of the charging protection control MOS tube Q6 is electrically connected with a battery pack BMS charging control end CHG, the source electrode of the charging protection control MOS tube Q6 is respectively electrically connected with the negative electrode P-of a battery pack charging port and the emitter electrode of the triode Q3, and the drain electrode of the charging protection control MOS tube Q6 is electrically connected with the drain electrode of the discharging protection control MOS tube Q5;
The base electrode of the triode Q3 is respectively and electrically connected with the cathode B-of the lithium battery cell and the source electrode of the discharge protection control MOS tube Q5 through a resistor R8, the emitter electrode of the triode Q3 is respectively and electrically connected with the cathode P-of the charging port of the battery pack and the source electrode of the charge protection control MOS tube Q6, and the collector electrode of the triode Q3 is electrically connected with the base electrode of the triode Q4 through a resistor R7;
The base of the triode Q4 is electrically connected with the collector of the triode Q3, the emitter of the triode Q is electrically connected with the power supply 5VDD, and the collector of the triode Q is electrically connected with the signal output end OUT through a resistor R9.
The discharge protection control MOS tube Q5 is controlled to be conducted or cut off by a BMS end through a DSG signal; the charging protection control MOS transistor Q6 is controlled to be conducted or cut off by the BMS end through a CHG signal.
Further, on the basis of the above embodiment, the lithium battery float charge alarm control circuit further includes: the self-locking circuit, the self-locking circuit includes: reset switch SW1, transistor Q2, transistor Q7, MOS transistor Q8 and transistor Q9.
One end of the reset switch SW1 is grounded, and the other end of the reset switch SW1 is electrically connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 through a resistor R2 and the collector electrode of the triode Q1 through a resistor R3 respectively;
the base electrode of the triode Q1 is electrically connected with the collector electrode of the triode Q2 through a resistor R4, is grounded through a resistor R5, is electrically connected with the collector electrode of the triode Q9 and is electrically connected with the base electrode of the triode Q7, the collector electrode of the triode Q1 is electrically connected with the base electrode of the triode Q2 through a resistor R3, and the emitter electrode of the triode Q2 is respectively grounded and is electrically connected with the negative electrode B-of the lithium battery cell through a resistor R10; resistor R10 is a single point ground connection resistor, and a 0 ohm resistor can be used;
The base of the triode Q1 is also grounded through an energy storage capacitor C2. The energy storage capacitor C2 can increase trigger delay, so that the activation signal is more stable.
The base electrode of the triode Q2 is electrically connected with the reset switch SW1, the emitter electrode of the triode Q2 is electrically connected with the base electrode of the triode Q2 through a resistor R2, and the collector electrode of the triode Q2 is electrically connected with the base electrode of the triode Q1 through a resistor R4;
the emitter of the triode Q2 is also electrically connected with a power supply 5VDD through a resistor R1; further, the emitter thereof is grounded through a bypass capacitor C1. The resistor R1 is a current limiting resistor, and limits the base current flowing into the transistor Q1.
The base electrode of the triode Q9 is respectively and electrically connected with the grid electrode of the charging protection control MOS tube Q6 and the charging control end CHG of the battery pack BMS, the collector electrode of the triode Q9 is electrically connected with the base electrode of the triode Q7, and the emitter electrode of the triode is grounded.
The base electrode of the triode Q7 is electrically connected with the collector electrode of the triode Q9, the collector electrodes of the triode Q7 are respectively electrically connected with the power supply 5VDD and the grid electrode of the MOS tube Q8, and the emitter electrode of the triode Q is grounded;
The base electrode of the triode Q7 is electrically connected with the grid electrode of the MOS tube Q8 through a resistor R6.
The grid electrode of the MOS transistor Q8 is electrically connected with the collector electrode of the triode Q7, the source electrode of the MOS transistor Q8 is electrically connected with the power supply 5VDD, and the drain electrode of the MOS transistor Q8 is respectively electrically connected with the base electrode of the triode Q4 and the collector electrode of the triode Q3.
Clearing the output signal through a reset switch SW 1; transistor Q9 is a reset signal disable switch. The working flow of the utility model is as follows:
when the lithium battery is normally charged in the charging station, at the moment, DSG and CHG are both in high level, Q5 and Q6 are in an on state, the base electrode and the emitter electrode of the triode Q3 are in the same potential and are both in low level, the triode Q3 is in an off state, the triode Q4 is also in an off state, and the signal output end OUT is in an on-off state.
When the lithium battery is fully charged in the charging station, the BMS triggers the CHG to be a low level signal, the Q6 is closed to stop charging, at the moment, the voltage of the charger is higher than the total voltage of the battery cell due to the fact that the charger is connected, the P-voltage is lower than the B-point voltage, the base electrode of the triode Q3 is relatively high in level, the triode Q3 is in a conducting state, the base electrode of the triode Q4 is pulled down to be low level, the triode Q4 is also in a conducting state, and the signal output end OUT outputs a high level signal.
When the reset switch SW1 is pressed, the base of the triode Q2 is set to be low level, the triode Q2 is in a conducting state, the base of the triode Q1 is divided into high level through the resistor R1, the triode Q2, the resistor R4 and the resistor R5, the triode Q1 is also in a conducting state, and the base of the triode Q2 is divided into low level through the resistor R1, the resistor R2, the resistor R3 and the triode Q1 and then forms self locking relative to the emitting of the Q2.
At this time, even if the reset switch SW1 is released, the base of the resistor Q1 is still in a high-level state, the base of the resistor Q7 is also in a high-level state, the resistor Q7 is in a conductive state, the gate of the MOS transistor Q8 is pulled down to a low level through the transistor Q7, the MOS transistor QS is in a conductive state, the base of the transistor Q4 is pulled up to 5VDD through the MOS transistor Q8, the same potential as the emitter of the transistor Q4, the transistor Q4 is in a cut-off state, the signal output terminal OUT stops outputting a high-level signal, and the transistor Q4 is in an open-drain state.
When the lithium battery pack recovers from full charge, the BMS triggers the CHG to be a high level signal, the base electrode of the triode Q9 is also high level, the triode Q9 is in a conducting state, the base electrodes of the triode Q1 and the triode Q7 are both set to be low level, and the self-locking state and the reset signal are invalid.
The transistors Q1, Q3, Q7, and Q9 may be, but not limited to, NPN transistors, or N-channel MOSFETs. The transistors Q2 and Q4 may be, but not limited to, PNP, or P-channel MOSFETs.
It should be noted that the resistor R10 may be a 0R resistor, and a wire may be used to electrically connect the emitter of the transistor Q1 with the negative electrode B of the lithium battery cell.
According to the invention, after the lithium battery pack is fully charged, the full charge warning signal is output, the charging station management system can prompt that the battery pack is fully charged after receiving the warning signal, meanwhile, the charging station is controlled to avoid the need of carrying out power supplementing operation on the battery pack, and a user can intuitively know the charging state of the battery pack by checking the prompt.
In summary, the utility model discloses a lithium battery float charge alarm control circuit, which has the following beneficial effects:
Firstly, through the voltage difference between the negative electrode P-of the charging port of the lithium battery pack and the negative electrode B-of the lithium battery core after the lithium battery pack is fully charged for protection, the automatic triggering of the alarm signal is realized, and the fully charged alarm signal is output after the lithium battery pack is fully charged.
Secondly, the key reset signal is locked through the self-locking circuit, the function of clearing the alarm signal is realized, a user can intuitively know the charging state of the battery pack by looking at the alarm signal prompt, and the alarm signal can be cleared through the reset key.
Thirdly, the utility model can automatically output the charge state alarm, thereby realizing the intellectualization of the work of the electronic product, and has simple circuit, low power consumption and low cost.
While the basic principles and main features of the present utility model and advantages of the present utility model have been shown and described, it will be understood by those skilled in the art that the present utility model is not limited by the foregoing embodiments, which are described in the foregoing specification merely illustrate the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined in the appended claims and their equivalents.
Claims (10)
1. Lithium cell floats and fills charge alarm control circuit, its characterized in that includes: discharge protection control MOS transistor Q5, charge protection control MOS transistor Q6, triode Q3 and triode Q4;
The grid electrode of the discharge protection control MOS tube Q5 is electrically connected with a discharge control end DSG of the battery pack BMS, the source electrode of the discharge protection control MOS tube Q5 is respectively and electrically connected with a negative electrode B-of the lithium battery core and the base electrode of the triode Q3, and the drain electrode of the discharge protection control MOS tube Q5 is electrically connected with the drain electrode of the charge protection control MOS tube Q6;
The grid electrode of the charging protection control MOS tube Q6 is electrically connected with a battery pack BMS charging control end CHG, the source electrode of the charging protection control MOS tube Q6 is respectively electrically connected with the negative electrode P of a battery pack charging port and the emitter electrode of the triode Q3, and the drain electrode of the charging protection control MOS tube Q6 is electrically connected with the drain electrode of the discharging protection control MOS tube Q5;
The base electrode of the triode Q3 is respectively and electrically connected with the cathode B-of the lithium battery cell and the source electrode of the discharge protection control MOS tube Q5, the emitter electrode of the triode Q3 is respectively and electrically connected with the cathode P-of the charging port of the battery pack and the source electrode of the charge protection control MOS tube Q6, and the collector electrode of the triode Q3 is electrically connected with the base electrode of the triode Q4;
the base of the triode Q4 is electrically connected with the collector of the triode Q3, the emitter of the triode Q is electrically connected with the power supply VDD, and the collector of the triode Q is electrically connected with the signal output end OUT.
2. The lithium battery float charge alarm control circuit of claim 1, wherein the base of the triode Q3 is electrically connected to the negative electrode B "of the lithium battery cell through at least one resistor.
3. The lithium battery floating charge warning control circuit according to claim 1, wherein the collector of the triode Q3 is electrically connected with the base of the triode Q4 through at least one resistor.
4. The lithium battery float charge alarm control circuit of claim 1, wherein the collector of the triode Q4 is electrically connected to the signal output terminal OUT through at least one resistor.
5. The lithium battery float charge alarm control circuit of any of claims 1-4, further comprising: a self-locking circuit, the self-locking circuit comprising: reset switch SW1, transistor Q2, transistor Q7, MOS transistor Q8, and transistor Q9;
One end of the reset switch SW1 is grounded, and the other end of the reset switch SW1 is electrically connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 through a resistor R2 and the collector electrode of the triode Q1 through a resistor R3 respectively;
The base electrode of the triode Q1 is electrically connected with the collector electrode of the triode Q2 through a resistor R4, is grounded through a resistor R5, is electrically connected with the collector electrode of the triode Q9 and is electrically connected with the base electrode of the triode Q7, the collector electrode of the triode Q1 is electrically connected with the base electrode of the triode Q2 through a resistor R3, and the emitter electrode of the triode Q1 is respectively grounded and is electrically connected with the negative electrode B-of the lithium battery cell;
The base electrode of the triode Q2 is electrically connected with the reset switch SW1, the emitter electrode of the triode Q2 is electrically connected with the base electrode of the triode Q2 through a resistor R2, and the collector electrode of the triode Q2 is electrically connected with the base electrode of the triode Q1 through a resistor R4;
The base electrode of the triode Q9 is respectively and electrically connected with the grid electrode of the charging protection control MOS tube Q6 and the charging control end CHG of the battery pack BMS, the collector electrode of the triode Q9 is electrically connected with the base electrode of the triode Q7, and the emitter electrode of the triode is grounded;
the base electrode of the triode Q7 is electrically connected with the collector electrode of the triode Q9, the collector electrodes of the triode Q7 are respectively electrically connected with the power supply VDD and the grid electrode of the MOS tube Q8, and the emitter electrode of the triode Q8 is grounded;
The grid electrode of the MOS transistor Q8 is electrically connected with the collector electrode of the triode Q7, the source electrode of the MOS transistor Q8 is electrically connected with the power supply VDD, and the drain electrode of the MOS transistor Q8 is respectively electrically connected with the base electrode of the triode Q4 and the collector electrode of the triode Q3.
6. The lithium battery floating charge warning control circuit of claim 5, wherein the emitter of the triode Q2 is electrically connected to the power supply VDD through at least one resistor.
7. The lithium battery float charge alarm control circuit of claim 5, wherein the emitter of the transistor Q2 is further grounded through at least one bypass capacitor.
8. The lithium battery float charge alarm control circuit of claim 5, wherein the base of the triode Q1 is further grounded through at least one energy storage capacitor.
9. The lithium battery floating charge warning control circuit according to claim 5, wherein the base electrode of the triode Q7 is electrically connected with the grid electrode of the MOS tube Q8 through at least one resistor.
10. The lithium battery floating charge warning control circuit of claim 5, wherein the at least one resistor of the emitter of the triode Q1 is electrically connected with the negative electrode B-of the lithium battery cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322503612.XU CN220797851U (en) | 2023-09-15 | 2023-09-15 | Lithium battery float charging alarm control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322503612.XU CN220797851U (en) | 2023-09-15 | 2023-09-15 | Lithium battery float charging alarm control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220797851U true CN220797851U (en) | 2024-04-16 |
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ID=90633897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322503612.XU Active CN220797851U (en) | 2023-09-15 | 2023-09-15 | Lithium battery float charging alarm control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220797851U (en) |
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2023
- 2023-09-15 CN CN202322503612.XU patent/CN220797851U/en active Active
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