CN220086979U - Driving circuit with constant charging current and lithium battery assembly thereof - Google Patents
Driving circuit with constant charging current and lithium battery assembly thereof Download PDFInfo
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- CN220086979U CN220086979U CN202321249186.5U CN202321249186U CN220086979U CN 220086979 U CN220086979 U CN 220086979U CN 202321249186 U CN202321249186 U CN 202321249186U CN 220086979 U CN220086979 U CN 220086979U
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- 238000007600 charging Methods 0.000 title claims abstract description 50
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 32
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 31
- 238000004146 energy storage Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model belongs to the technical field of electronic circuits, and relates to a constant charging current driving circuit and a lithium battery component thereof, wherein the constant charging current driving circuit comprises: the battery charger comprises a first interface, a voltage stabilizing circuit, a voltage dividing circuit, an operational amplifier circuit, a switch circuit and a second interface, wherein the first interface is used for being connected with an output interface of the charger, the voltage stabilizing circuit is connected with the first interface, the voltage dividing circuit is connected with the voltage stabilizing circuit, the operational amplifier circuit is connected with the voltage dividing circuit, the switch circuit is connected with the operational amplifier circuit, the second interface is connected with the switch circuit, and the second interface is also used for being connected with an energy storage battery. The lithium battery charger has the advantages that the lithium battery can be suitable for chargers with different charging capacities, no matter what charging current the charger can provide, the current output by the charger to the lithium battery can be always in a set value, and the current cannot change along with the change of the current output by the charger.
Description
Technical Field
The utility model belongs to the technical field of electronic circuits, and relates to a driving circuit with constant charging current and a lithium battery component thereof.
Background
At present, when the lithium battery is charged, the charging time is prolonged when the lithium battery is charged by using less than the rated maximum chargeable current due to the inconsistent rated maximum chargeable current allowed by the chargeable batteries with different capacities; charging with a current exceeding the rated maximum chargeable current may lead to a shortened battery life and may even cause a series of battery safety problems such as battery swelling, explosion, etc. Thus, in theory, the maximum rated charge current given to the different batteries has the best charge efficiency.
The first solution for common charging of lithium batteries at present is to set a fixed charging current by a charger, and the second solution is to adjust the charging current at the charger end by identifying the battery end device based on a certain vendor custom protocol. The drawbacks of the first solution are: the battery charger is matched with the battery charger with different charging specifications, so that the number of the required battery chargers is large, the space is occupied, the resource is wasted, the battery charger is inconvenient to carry, and a user needs to find the corresponding battery charger to have optimal charging efficiency and ensure charging safety during charging; the drawbacks of the second solution are: the protocol can only define and set several fixed charging currents in advance, and can only be applied to products with set currents not higher than the rated charging current of the product, so that the method has no optimal charging efficiency.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, and provides a driving circuit with constant charging current and a lithium battery component thereof, which can realize that a charger can charge lithium batteries with different capacity specifications.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a drive circuit with constant charging current, comprising: the battery charger comprises a first interface, a voltage stabilizing circuit, a voltage dividing circuit, an operational amplifier circuit, a switch circuit and a second interface, wherein the first interface is used for being connected with an output interface of the charger, the voltage stabilizing circuit is connected with the first interface, the voltage dividing circuit is connected with the voltage stabilizing circuit, the operational amplifier circuit is connected with the voltage dividing circuit, the switch circuit is connected with the operational amplifier circuit, the second interface is connected with the switch circuit, and the second interface is also used for being connected with an energy storage battery.
Further, the voltage stabilizing circuit includes: the first end of the first resistor is connected with the positive electrode connecting end of the first interface, the second end of the first resistor is connected with the output end of the voltage stabilizing element, and the input end of the voltage stabilizing element is connected with the negative electrode connecting end of the first interface.
Further, the voltage dividing circuit includes: the first end of the second resistor is connected to the first end of the first resistor and the voltage stabilizing element, the second end of the second resistor is connected with the first end of the fourth resistor, the connection end of the second resistor and the fourth resistor is connected with the operational amplifier circuit, the second end of the fourth resistor is connected with the negative electrode connection end of the first interface, the first end of the third resistor is connected with the connection end of the second resistor and the fourth resistor, and the second end of the third resistor is connected to the negative electrode connection end of the first interface and the second end of the fourth resistor.
Further, the operational amplifier circuit includes: the negative electrode connecting end of the operational amplifier is connected with the connecting end of the second resistor and the fourth resistor, the positive electrode connecting end of the operational amplifier is connected with the negative electrode connecting end of the second interface, and the output end of the operational amplifier is connected with the switch circuit.
Further, the switching circuit includes: the MOS tube and the sixth resistor, the grid electrode of the MOS tube is connected with the output end of the operational amplifier, the source electrode of the MOS tube is connected with the positive electrode connecting end of the first interface, the drain electrode of the MOS tube is connected with the positive electrode connecting end of the second interface, the first end of the sixth resistor is connected with the source electrode of the MOS tube, and the second end of the sixth resistor is connected with the grid electrode of the MOS tube.
Further, a fifth resistor is well connected between the negative electrode connecting end of the first interface and the negative electrode connecting end of the second interface.
The present utility model also provides a lithium battery module including: the lithium battery and install in the drive plate on the lithium battery, a constant drive circuit of charging current on the drive plate.
The utility model has the beneficial effects that:
the lithium battery can be suitable for chargers with different charging capacities through the arrangement of the driving circuit, the voltage stabilizing circuit, the voltage dividing circuit, the operational amplifier circuit and the switching circuit, no matter how much charging current can be provided by the charger, the current output to the lithium battery by the charger can be always in a set value, the current cannot change along with the change of the current output by the charger, and when the lithium battery is charged, a user only needs to select the charger with the largest charging capacity, the charger is used for charging the lithium battery with different capacity specifications, the problem that the chargers with different charging specifications are matched with the charger to avoid products of the batteries with different capacity specifications, and the number of the chargers is multiple and the carrying is inconvenient is caused.
Drawings
Fig. 1 is a schematic diagram of the principles of the present utility model.
Description of the embodiments
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a driving circuit for constant charging current includes: the battery charger comprises a first interface, a voltage stabilizing circuit, a voltage dividing circuit, an operational amplifier circuit, a switch circuit and a second interface, wherein the first interface is used for being connected with an output interface of the charger, the voltage stabilizing circuit is connected with the first interface, the voltage dividing circuit is connected with the voltage stabilizing circuit, the operational amplifier circuit is connected with the voltage dividing circuit, the switch circuit is connected with the operational amplifier circuit, the second interface is connected with the switch circuit, and the second interface is also used for being connected with an energy storage battery.
The lithium battery charger comprises a driving circuit, a voltage stabilizing circuit, a voltage dividing circuit, an operational amplifier circuit and a switching circuit, wherein the driving circuit is composed of the voltage stabilizing circuit, the voltage dividing circuit, the operational amplifier circuit and the switching circuit, so that the lithium battery can be suitable for chargers with different charging capacities, the charging current of the lithium battery can not be influenced no matter what the charger can provide with the largest charging current, and when the lithium battery is charged, a user only needs to select the charger with the largest charging capacity, so that the charging requirements of all products can be met most efficiently and safely.
In one embodiment, the voltage stabilizing circuit includes: the first resistor R1 and the voltage stabilizing element U2, the first end of the first resistor R1 is connected with the positive electrode connecting end CHG+ of the first interface J1, the second end of the first resistor R1 is connected with the output end of the voltage stabilizing element U1, and the input end of the voltage stabilizing element U1 is connected with the negative electrode connecting end of the first interface J1. In this embodiment, the voltage stabilizing element U2 is of a model TL431.
In one embodiment, the voltage dividing circuit includes: the first end of the second resistor R2 is connected between the first resistor R1 and the voltage stabilizing element U1, the second end of the second resistor R2 is connected with the first end of the fourth resistor R4, the connection end of the second resistor R2 and the fourth resistor R4 is connected with the operational amplifier circuit, the second end of the fourth resistor R4 is connected with the negative electrode connection end of the first interface J1, the first end of the third resistor R3 is connected with the connection end of the second resistor R2 and the fourth resistor R4, and the second end of the third resistor R3 is connected between the negative electrode connection end of the first interface J1 and the second end of the fourth resistor R4. The voltage dividing circuit is arranged to provide a tiny reference voltage Vref for the driving circuit, so that the reference voltage Vref does not change along with the current change of the input and output voltage, and the set current is ensured not to exceed the maximum current range provided by the charger.
In one embodiment, the operational amplifier circuit includes: the negative electrode connecting end of the operational amplifier U1 is connected with the connecting end of the second resistor R2 and the fourth resistor R4, the positive electrode connecting end of the operational amplifier U1 is connected with the negative electrode connecting end of the second interface J1, the output end of the operational amplifier U1 is connected with the switching circuit, the No. 2 connecting end of the operational amplifier U1 is further connected with the negative electrode connecting end CHG-of the first interface, the No. 5 connecting end of the operational amplifier U1 is connected with the positive electrode connecting end CHG+ of the first interface J1, a filter capacitor C2 is further connected between the No. 2 connecting end and the positive electrode connecting end CHG+ of the operational amplifier U1, and the other end of the filter capacitor C2 is grounded. The negative electrode connection end of the operational amplifier U1 is the third connection end of the operational amplifier U1, the positive electrode connection end of the operational amplifier U1 is the 5 connection end of the operational amplifier U1, and the output end of the operational amplifier U1 is the 1 connection end of the operational amplifier U1. In this embodiment, the model of the operational amplifier U1 is TLV333.
In one embodiment, a switching circuit includes: MOS pipe Q1 and sixth resistance R6, MOS pipe Q1's grid is connected operational amplifier U1's output, MOS pipe Q1's source connection first interface J1's anodal link chG+, MOS pipe Q1's drain electrode is connected second interface J2's anodal link BAT+, the source electrode of MOS pipe Q1 is connected to sixth resistance R6's first end, the second end of sixth resistance R6 is connected MOS pipe Q1's grid. In this embodiment, the type of the MOS transistor Q1 is JMTJ3401A.
In one embodiment, a fifth resistor R5 is well connected between the negative electrode connection end of the first interface J1 and the negative electrode connection end of the second interface J2, specifically, a first end of the fifth resistor R5 is connected to the positive electrode connection end of the operational amplifier U1, and a second end of the fifth resistor R5 is connected to the second end of the fourth resistor R4. Through setting to fifth resistance R5 for the user can set up the numerical value of fifth resistance R5 in advance as required, and define the charging current size according to the reference voltage that sets for each product can be pointed out the best charging current size of adjusting, guarantees any charger that is higher than product rated current, all makes the lithium cell can have best charging efficiency, promotes the security performance of lithium cell at the charging process, avoids the current of charger input to be greater than the rated charging current of lithium cell and leads to the emergence that battery life shortens.
The present utility model also provides a lithium battery module including: the lithium battery and install in the drive plate on the lithium battery, a constant drive circuit of charging current on the drive plate.
Working principle: taking 3.7V lithium ion battery charging as an example, when the output end (usually 4.2V) of the charger is connected, the circuit supplies power to the voltage stabilizing element U2 through the first resistor 4 at first, so that the voltage passing through the voltage stabilizing circuit can provide stable 2.5V voltage, then the voltage is divided by the second resistor R2, the third resistor R3 and the fourth resistor R4 to provide constant reference voltage Vref for the negative electrode connecting end of the operational amplifier U1, the charger provides working voltage for the operational amplifier U1 through the filter capacitor C2, in the initial state of charging, the voltage of the negative electrode connecting end of the operational amplifier U1 is higher than the voltage of the positive electrode connecting end, at the moment, the output end of the operational amplifier U1 is at a low level, the MOS tube Q1 is completely conducted, current flows from the positive end CHG+ of the charger to the positive electrode connecting end BAT+ of the battery through the MOS tube Q1, and then flows from the negative electrode connecting end of the battery, the fifth resistor R5 is returned to the charger negative electrode connection end CHG-to form a charging loop, when the current i is increased to i=Vref/R5, the level between the positive electrode connection end and the negative electrode connection end of the operational amplifier U1 is equal, at the moment, the output end of the operational amplifier U1 automatically raises the output level, the MOS tube Q1 works in a constant current area (the impedance is increased), the limiting current is further increased, the final charging current reaches a balanced stable state at the i=Vref/R5 position, when the output current of the charger is lower than the set Vref/R5 (such as trickle charging step or constant voltage charging step), the output end of the operational amplifier U1 is kept at a low level because the voltage of the positive electrode connection end of the operational amplifier U1 is lower than the voltage of the negative electrode connection end, the MOS tube Q1 is completely conducted, at the moment, the charging loop follows the conventional charging process, the circuit control does not affect the charging process.
The above-described embodiments are only one of the preferred embodiments of the present utility model, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model should be included in the scope of the present utility model.
Claims (7)
1. A drive circuit for constant charging current, comprising: the battery charger comprises a first interface, a voltage stabilizing circuit, a voltage dividing circuit, an operational amplifier circuit, a switch circuit and a second interface, wherein the first interface is used for being connected with an output interface of the charger, the voltage stabilizing circuit is connected with the first interface, the voltage dividing circuit is connected with the voltage stabilizing circuit, the operational amplifier circuit is connected with the voltage dividing circuit, the switch circuit is connected with the operational amplifier circuit, the second interface is connected with the switch circuit, and the second interface is also used for being connected with an energy storage battery.
2. The constant charging current driving circuit according to claim 1, wherein the voltage stabilizing circuit comprises: the first end of the first resistor is connected with the positive electrode connecting end of the first interface, the second end of the first resistor is connected with the output end of the voltage stabilizing element, and the input end of the voltage stabilizing element is connected with the negative electrode connecting end of the first interface.
3. A constant charge current driving circuit according to claim 2, wherein said voltage dividing circuit comprises: the first end of the second resistor is connected to the first end of the first resistor and the voltage stabilizing element, the second end of the second resistor is connected with the first end of the fourth resistor, the connection end of the second resistor and the fourth resistor is connected with the operational amplifier circuit, the second end of the fourth resistor is connected with the negative electrode connection end of the first interface, the first end of the third resistor is connected with the connection end of the second resistor and the fourth resistor, and the second end of the third resistor is connected to the negative electrode connection end of the first interface and the second end of the fourth resistor.
4. A constant charge current driving circuit according to claim 3, wherein said operational amplifier circuit comprises: the negative electrode connecting end of the operational amplifier is connected with the connecting end of the second resistor and the fourth resistor, the positive electrode connecting end of the operational amplifier is connected with the negative electrode connecting end of the second interface, and the output end of the operational amplifier is connected with the switch circuit.
5. The constant charge current driving circuit according to claim 4, wherein the switching circuit comprises: the MOS tube and the sixth resistor, the grid electrode of the MOS tube is connected with the output end of the operational amplifier, the source electrode of the MOS tube is connected with the positive electrode connecting end of the first interface, the drain electrode of the MOS tube is connected with the positive electrode connecting end of the second interface, the first end of the sixth resistor is connected with the source electrode of the MOS tube, and the second end of the sixth resistor is connected with the grid electrode of the MOS tube.
6. The constant charge current driving circuit according to claim 4, wherein a fifth resistor is connected between the negative electrode connection terminal of the first interface and the negative electrode connection terminal of the second interface.
7. A lithium battery assembly comprising: a lithium battery and a driving board mounted on the lithium battery, wherein the driving board is provided with the driving circuit with constant charging current as claimed in any one of claims 1-6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222879003 | 2022-10-31 | ||
| CN202222879003X | 2022-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220086979U true CN220086979U (en) | 2023-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321249186.5U Active CN220086979U (en) | 2022-10-31 | 2023-05-23 | Driving circuit with constant charging current and lithium battery assembly thereof |
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| Country | Link |
|---|---|
| CN (1) | CN220086979U (en) |
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2023
- 2023-05-23 CN CN202321249186.5U patent/CN220086979U/en active Active
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Address after: Building 2, Cuiheng International Science and Technology Innovation Center, No. 21 Beichen Road, Cuiheng New District, Zhongshan City, Guangdong Province, 528400, 604 Patentee after: Aolei Technology Group Co.,Ltd. Address before: 518000 A2 fifth floor, Fuhai information port, Qiaotou community, Fuhai street, Shenzhen, Guangdong, Baoan District Patentee before: Shenzhen Olight E-Commerce Technology Co.,Ltd. |