CN219420346U - Weak current on-off circuit of battery and lithium battery - Google Patents
Weak current on-off circuit of battery and lithium battery Download PDFInfo
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- CN219420346U CN219420346U CN202320589527.7U CN202320589527U CN219420346U CN 219420346 U CN219420346 U CN 219420346U CN 202320589527 U CN202320589527 U CN 202320589527U CN 219420346 U CN219420346 U CN 219420346U
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- 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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Abstract
The application provides a weak current switching circuit of a battery and a lithium battery. The weak current switch circuit of the battery comprises a first resistor, a second resistor and a first capacitor, wherein the first end of the first resistor is used for being connected with a reference power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded through the first capacitor, the first end of the second resistor is used for being connected with a switch detection end of the battery protector, the second end of the second resistor is used for corresponding to a discharging negative electrode of the battery, and when the second end of the second resistor is short-circuited or disconnected with the discharging negative electrode of the battery, the battery protector starts or stops outputting the battery. When the second end of the second resistor is short-circuited with the discharging cathode of the battery, the voltage acquired by the switch detection end of the battery protector is reduced, so that the second end of the second resistor is used as a weak current switch to control the battery to be powered off, and the power on/off of the battery is realized through weak current signals, so that the overall power consumption is effectively reduced.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a weak current on-off circuit of a battery and a lithium battery.
Background
Among general lithium battery protection schemes, hardware protection schemes are particularly suitable for being turned on or off only by manually switching on or off, for example, chinese patent application CN 200480002061.6. At present, the BMS protection board commonly used in the market is used for controlling the output of a discharge port in a switching mode whether in a hardware scheme or a software scheme, and particularly in the hardware scheme design, under the condition of shutdown, an internal chip is not completely powered down and is in a standby mode with power consumption.
However, if the battery is not shut down in time after being started in the transportation process, a certain safety risk exists when the battery is stored for a long time, and if the battery is in a state of being stored for a long time and not charged, the battery is dead due to power consumption of the protection plate.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides a battery weak current on-off circuit and a lithium battery which can effectively reduce power consumption.
The aim of the utility model is realized by the following technical scheme:
a battery weak current startup and shutdown circuit, comprising: the battery protector comprises a first resistor, a second resistor and a first capacitor, wherein the first end of the first resistor is used for being connected with a reference power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded through the first capacitor, the first end of the second resistor is used for being connected with a switch detection end of the battery protector, and the second end of the second resistor is used for corresponding to a battery discharging negative electrode, so that when the second end of the second resistor is in short circuit or disconnection with the battery discharging negative electrode, the battery protector starts or shuts down the output of the battery.
In one embodiment, at least one of the first resistor and the second resistor is a variable resistor.
In one embodiment, the weak current on-off circuit of the battery further comprises a third resistor, wherein the second end of the first resistor is connected with the first end of the third resistor, and the second end of the third resistor is connected with the switch detection end of the battery protector.
In one embodiment, the third resistor is a variable resistor.
In one embodiment, the weak current power on/off circuit of the battery further comprises a second capacitor, and the second end of the third resistor is grounded through the second capacitor.
In one embodiment, the weak current on-off circuit of the battery further comprises a protection diode, the second end of the second resistor is connected with the positive electrode of the protection diode, and the negative electrode of the protection diode corresponds to the discharge negative electrode of the battery.
In one embodiment, the weak current on-off circuit of the battery further comprises a protection voltage stabilizing tube, wherein the negative electrode of the protection diode is connected with the positive electrode of the protection voltage stabilizing tube, and the negative electrode of the protection voltage stabilizing tube is grounded.
In one embodiment, the weak current on-off circuit of the battery further comprises a third capacitor, and the negative electrode of the protection diode is grounded through the third capacitor.
In one embodiment, the third capacitor is a variable capacitor.
A lithium battery comprises the weak current power on/off circuit of any embodiment.
Compared with the prior art, the utility model has at least the following advantages:
when the second end of the second resistor is short-circuited with the discharge cathode of the battery, the voltage acquired by the switch detection end of the battery protector is reduced, so that the second end of the second resistor is used as a weak current switch to control the battery to be powered off; when the second end of the second resistor is disconnected with the discharging cathode of the battery, the voltage acquired by the switch detection end of the battery protector is unchanged, namely, the voltage is still high, so that the second end of the second resistor is used as a weak current switch to control the battery to start, the starting and the stopping of the battery are realized through weak current signals, and the overall power consumption is effectively reduced.
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 weak current power on/off circuit of a battery in an embodiment.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
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. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The utility model relates to a weak current on-off circuit of a battery. In one embodiment, the weak current switching circuit of the battery comprises a first resistor, a second resistor and a first capacitor, wherein a first end of the first resistor is used for being connected with a reference power supply, a second end of the first resistor is connected with a first end of the second resistor, a second end of the second resistor is grounded through the first capacitor, a first end of the second resistor is used for being connected with a switch detection end of the battery protector, and a second end of the second resistor is used for corresponding to a battery discharging negative electrode, so that the battery protector starts or stops the output of the battery when the second end of the second resistor is short-circuited or disconnected with the battery discharging negative electrode. When the second end of the second resistor is short-circuited with the discharge cathode of the battery, the voltage acquired by the switch detection end of the battery protector is reduced, so that the second end of the second resistor is used as a weak current switch to control the battery to be powered off; when the second end of the second resistor is disconnected with the discharging cathode of the battery, the voltage acquired by the switch detection end of the battery protector is unchanged, namely, the voltage is still high, so that the second end of the second resistor is used as a weak current switch to control the battery to start, the starting and the stopping of the battery are realized through weak current signals, and the overall power consumption is effectively reduced.
Fig. 1 is a circuit diagram of a weak current power on/off circuit of a battery according to an embodiment of the utility model.
The battery weak current power on/off circuit 10 of an embodiment includes a first resistor R1, a second resistor R2, and a first capacitor C1. The first end of the first resistor R1 is connected to the reference power VCC, the second end of the first resistor R1 is connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded through the first capacitor C1. The first end of the second resistor R2 is used for being connected with a switch detection end SW_ON of the battery protector, and the second end of the second resistor R2 is used for being corresponding to a battery discharging negative electrode, so that when the second end of the second resistor R2 is short-circuited or disconnected with the battery discharging negative electrode, the battery protector starts or stops the output of the battery.
In this embodiment, when the second end of the second resistor R2 is shorted to the battery discharge cathode, the voltage collected by the switch detection end sw_on of the battery protector is reduced, so that the second end of the second resistor R2 is used as a weak current switch to control the battery to be turned off; when the second end of the second resistor R2 is disconnected from the discharging cathode of the battery, the voltage acquired by the switch detection end SW_ON of the battery protector is unchanged, namely, is still high, so that the second end of the second resistor R2 is used as a weak current switch to control the starting of the battery, the starting and the stopping of the battery are realized through weak current signals, and the overall power consumption is effectively reduced. In addition, the reference power supply VCC of the battery protector is used as a standard power supply for detecting the identification signal, so that the battery can be effectively ensured to be in a normal working state, and the overall safety performance of the battery is improved. Wherein, the battery protector is a BMS battery management chip.
In one embodiment, at least one of the first resistor R1 and the second resistor R2 is a variable resistor. In this embodiment, the first resistor R1 and the second resistor R2 form a voltage dividing circuit, that is, the first resistor R1 and the second resistor R2 divide the output voltage of the reference power VCC, the first resistor R1 pulls up the voltage of the reference power VCC, and the voltage ON the second resistor R2 is used as the sampling voltage of the switch detection terminal sw_on of the battery protector, so as to regulate and control the ON-off state of the battery. And the resistance of at least one of the first resistor R1 and the second resistor R2 is variable, so that the resistance ratio between the first resistor R1 and the second resistor R2 is adjustable, and the sampling voltage of the switch detection end sw_on of the battery protector is variable, so as to meet the sampling threshold of the battery protector, and facilitate weak-current switch control ON the ON-off of the battery.
In one embodiment, referring to fig. 1, the battery weak current power ON/off circuit 10 further includes a third resistor R3, wherein a second end of the first resistor R1 is connected to a first end of the third resistor R3, and a second end of the third resistor R3 is connected to a switch detection end sw_on of the battery protector. In this embodiment, the third resistor R3 is connected to the first resistor R1, specifically, the third resistor R3 is connected in series to the switch detection end sw_on of the battery protector, and the third resistor R3 limits the current ON the switch detection end sw_on of the battery protector, so as to avoid the condition that the current ON the switch detection end sw_on of the battery protector is too large, and ensure that the ON-off state of the battery is accurately sampled. In another embodiment, the third resistor R3 is a variable resistor, and by adjusting the resistance value of the third resistor R3, the current ON the switch detection terminal sw_on of the battery protector is conveniently adjusted, and the battery protector can be prevented from being damaged when the detected voltage can be sampled.
Further, the battery weak current on-off circuit 10 further includes a second capacitor C2, and the second end of the third resistor R3 is grounded through the second capacitor C2. In this embodiment, the second capacitor C2 is connected to the third resistor R3, specifically, the second capacitor C2 is connected in parallel to the switch detection terminal sw_on of the battery protector, and the second capacitor C2 performs filtering processing ON the electrical signal flowing through the third resistor R3, so that the voltage sampled by the switch detection terminal sw_on of the battery protector is more accurate. In addition, the second capacitor C2 plays a role in preventing abrupt level change ON the switch detection terminal sw_on of the battery protector, that is, avoiding abrupt level change caused by static electricity ON the switch detection terminal sw_on of the battery protector.
In one embodiment, referring to fig. 1, the battery weak current startup and shutdown circuit 10 further includes a protection diode D1, the second end of the second resistor R2 is connected to the positive electrode of the protection diode D1, and the negative electrode of the protection diode D1 corresponds to the discharge negative electrode of the battery. In this embodiment, the protection diode D1 is connected to the second resistor R2, specifically, the protection diode D1 is connected in series with the second resistor R2, the protection diode D1 unidirectional guides the current received on the battery discharging cathode, and the protection diode D1 has a protection function on the external high voltage connected to the battery discharging cathode, so that voltage impact on the battery protector is avoided, and normal operation of the battery protector is ensured.
Further, the battery weak current on-off circuit 10 further includes a protection voltage stabilizing tube DZ1, a cathode of the protection diode D1 is connected with an anode of the protection voltage stabilizing tube DZ1, and a cathode of the protection voltage stabilizing tube DZ1 is grounded. In this embodiment, the protection voltage stabilizing tube DZ1 is connected with the protection diode D1, specifically, the protection voltage stabilizing tube DZ1 is connected in parallel to the negative electrode of the protection diode D1, and the protection voltage stabilizing tube DZ1 stabilizes the voltage ON the negative electrode of the protection diode D1, so that the voltage ON the second end of the second resistor R2 is stable, and the voltage ON the switch detection end sw_on of the battery protector is above a specified voltage, so that the switch detection end sw_on of the battery protector can collect the voltage.
Still further, the battery weak current on-off circuit 10 further includes a third capacitor C3, and the negative electrode of the protection diode D1 is grounded through the third capacitor C3. In this embodiment, the third capacitor C3 is connected to the protection diode D1, specifically, the third capacitor C3 is connected in parallel to the negative electrode of the protection diode D1, and the third capacitor C3 performs filtering processing on the current on the second resistor R2, so that an electrical signal generated by shorting or disconnecting the second end of the second resistor R2 with the discharge negative electrode of the battery is more stable. In another embodiment, the third capacitor C3 is a variable capacitor, so as to facilitate filtering the weak current switch control signal on the second resistor R2 with different frequencies by adjusting the capacitance value of the third capacitor C3.
In one embodiment, the application further provides a lithium battery, which comprises the weak current power on/off circuit of the battery in any embodiment. In this embodiment, the weak current switching circuit of the battery includes a first resistor, a second resistor and a first capacitor, where a first end of the first resistor is connected to a reference power supply, a second end of the first resistor is connected to a first end of the second resistor, a second end of the second resistor is grounded through the first capacitor, a first end of the second resistor is connected to a switch detection end of the battery protector, and a second end of the second resistor is corresponding to a battery discharge cathode, so that the battery protector starts or closes an output of the battery when the second end of the second resistor is shorted to or disconnected from the battery discharge cathode. When the second end of the second resistor is short-circuited with the discharge cathode of the battery, the voltage acquired by the switch detection end of the battery protector is reduced, so that the second end of the second resistor is used as a weak current switch to control the battery to be powered off; when the second end of the second resistor is disconnected with the discharging cathode of the battery, the voltage acquired by the switch detection end of the battery protector is unchanged, namely, the voltage is still high, so that the second end of the second resistor is used as a weak current switch to control the starting of the battery, the starting and the stopping of the battery are realized through weak current signals, and the overall power consumption of the battery is effectively reduced.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A weak current on-off circuit for a battery, comprising: the battery protector comprises a first resistor, a second resistor and a first capacitor, wherein the first end of the first resistor is used for being connected with a reference power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded through the first capacitor, the first end of the second resistor is used for being connected with a switch detection end of the battery protector, and the second end of the second resistor is used for corresponding to a battery discharging negative electrode, so that when the second end of the second resistor is in short circuit or disconnection with the battery discharging negative electrode, the battery protector starts or shuts down the output of the battery.
2. The battery weak current power on-off circuit of claim 1, wherein at least one of the first resistor and the second resistor is a variable resistor.
3. The battery weak current power on-off circuit of claim 1, further comprising a third resistor, wherein a second end of the first resistor is connected to a first end of the third resistor, and wherein a second end of the third resistor is connected to a switch detection end of the battery protector.
4. The battery weak current power on-off circuit of claim 3, wherein the third resistor is a variable resistor.
5. The battery light-current power on-off circuit of claim 3, further comprising a second capacitor, wherein the second end of the third resistor is grounded through the second capacitor.
6. The battery weak current power on-off circuit of claim 1, further comprising a protection diode, wherein the second end of the second resistor is connected to the positive electrode of the protection diode, and wherein the negative electrode of the protection diode corresponds to the battery discharge negative electrode.
7. The battery weak current startup and shutdown circuit according to claim 6, further comprising a protection voltage stabilizing tube, wherein a negative electrode of the protection diode is connected with a positive electrode of the protection voltage stabilizing tube, and a negative electrode of the protection voltage stabilizing tube is grounded.
8. The battery weak current power on-off circuit of claim 6, further comprising a third capacitor, wherein the negative electrode of the protection diode is grounded through the third capacitor.
9. The battery weak current power on-off circuit of claim 8, wherein the third capacitance is a variable capacitance.
10. A lithium battery comprising the battery weak current power on-off circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320589527.7U CN219420346U (en) | 2023-03-22 | 2023-03-22 | Weak current on-off circuit of battery and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320589527.7U CN219420346U (en) | 2023-03-22 | 2023-03-22 | Weak current on-off circuit of battery and lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219420346U true CN219420346U (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320589527.7U Active CN219420346U (en) | 2023-03-22 | 2023-03-22 | Weak current on-off circuit of battery and lithium battery |
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| Country | Link |
|---|---|
| CN (1) | CN219420346U (en) |
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- 2023-03-22 CN CN202320589527.7U patent/CN219420346U/en active Active
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