CN110867918A - Battery control circuit suitable for two charging voltages and control method thereof - Google Patents
Battery control circuit suitable for two charging voltages and control method thereof Download PDFInfo
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- CN110867918A CN110867918A CN201911120099.8A CN201911120099A CN110867918A CN 110867918 A CN110867918 A CN 110867918A CN 201911120099 A CN201911120099 A CN 201911120099A CN 110867918 A CN110867918 A CN 110867918A
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Abstract
The invention provides a battery control circuit and a control method thereof suitable for two charging voltages, wherein a first battery and a second battery are connected in series; a first switch connected in series between the first battery and the second battery; the second switch is connected in parallel with the first battery and the two outer ends of the first switch; and the third switch is connected in parallel with the second battery and the two outer ends of the first switch. The battery control circuit can be suitable for the charging voltages of two different chargers, thereby increasing the condition that the rechargeable battery can be adapted to the charger and reducing the problem that the charger (such as a public charging pile) can not charge different batteries.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to a battery control circuit suitable for two charging voltages and a control method thereof.
Background
Conventional batteries, which are charged in only one voltage range, require a charger output voltage that is equal to the total voltage of the battery, i.e., V, as shown in FIG. 1B1+VB2And (4) adapting. When the output voltage of the charger is insufficient, the charger cannot be charged.
Through retrieval and discovery, patent document CN110347067A discloses a total voltage monitoring circuit of a battery management system, which comprises a control circuit, a total voltage acquisition circuit, a total voltage charge and discharge circuit and a total voltage calculation circuit, wherein the control circuit is connected with the total voltage acquisition circuit, the total voltage charge and discharge circuit and the total voltage calculation circuit, the total voltage acquisition circuit is connected with the total voltage charge and discharge circuit, the total voltage charge and discharge circuit is connected with the total voltage calculation circuit, the control circuit sends a first control signal to control the total voltage acquisition circuit to be connected to any total voltage in the battery management system and send the total voltage to the total voltage charge and discharge circuit for charging, when the voltage of the total voltage charge and discharge circuit is detected to reach a preset voltage, a second control signal is sent to control the total voltage calculation circuit to sample the voltage of the total voltage charge and discharge circuit to obtain a feedback voltage and send the feedback voltage to the control circuit, the control circuit receives the feedback voltage to obtain a, and sending a third control signal to control the total pressure charging and discharging circuit to discharge.
Disclosure of Invention
In view of the defects in the prior art, the present invention provides a battery control circuit and a control method thereof, which are suitable for two charging voltages.
The invention provides a battery control circuit suitable for two charging voltages, which comprises:
a first battery and a second battery connected in series;
a first switch connected in series between the first battery and the second battery;
the second switch is connected in parallel with the first battery and the two outer ends of the first switch;
and the third switch is connected in parallel with the second battery and the two outer ends of the first switch.
Preferably, at the time of charging:
the first switch is closed, and the second switch and the third switch are open; alternatively, the first and second electrodes may be,
the first switch is open and the second and third switches are closed.
Preferably, the first switch, the second switch and the third switch include: MOSFET, IGBT, relay or air switch.
Preferably, the positive electrode of the first battery is connected with the positive electrode of the charger and the positive electrode of the vehicle load, and the negative electrode of the second battery is connected with the negative electrode of the charger and the negative electrode of the vehicle load.
Preferably, the rated voltages of the first battery and the second battery are equal.
According to the battery control method suitable for two charging voltages provided by the invention, the battery control circuit suitable for two charging voltages is adopted to execute the following steps:
s1, checking the voltage of the first battery and the second battery, and judging whether the voltage difference between the first battery and the second battery is within a preset range;
s2, if the judgment result is negative, disconnecting the first switch, connecting the battery with higher voltage to the load on the whole vehicle side for discharging by controlling the second switch and the third switch, suspending the battery with lower voltage until the voltage difference reaches the preset range, and then executing S3;
if yes, go to S3 directly;
s3, when the voltage of the charger is larger than the rated voltage of a single battery and smaller than the total rated voltage of the first battery and the second battery, opening the first switch, closing the second switch and the third switch, and charging the first battery and the second battery in parallel;
and when the voltage of the charger is greater than the total rated voltage of the first battery and the second battery, closing the first switch, and opening the second switch and the third switch to charge the first battery and the second battery in series.
Preferably, the first switch, the second switch and the third switch include: MOSFET, IGBT, relay or air switch.
Preferably, the positive electrode of the first battery is connected with the positive electrode of the charger and the positive electrode of the vehicle load, and the negative electrode of the second battery is connected with the negative electrode of the charger and the negative electrode of the vehicle load.
Preferably, the rated voltages of the first battery and the second battery are equal.
Compared with the prior art, the invention has the following beneficial effects:
the battery control circuit can be suitable for the charging voltages of two different chargers, so that the condition that the rechargeable battery can be matched with the charger is increased, and the problem that the charger (such as a public charging pile) cannot charge different batteries is solved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a circuit diagram of a conventional charging circuit;
FIG. 2 is a circuit diagram of a charging circuit according to the present invention;
FIG. 3 is a schematic diagram of the present invention during buck charging;
FIG. 4 is an electrical schematic of an electric vehicle employing the present invention;
fig. 5 is a schematic diagram of electric discharge of an electric vehicle using the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 2, the present invention provides a battery control circuit adapted to two charging voltages, including:
a first battery B2 and a second battery B1 connected in series; a first switch K41 connected in series between the first battery B2 and the second battery B1; a second switch K42 connected in parallel to the two outer ends of the first battery B1 and the first switch K41; and a third switch K43 connected in parallel to the two outer ends of the second battery B1 and the first switch K41. The rated voltages of the first battery B2 and the second battery B1 are equal. These switches include: MOSFET, IGBT, relay or air switch.
During charging:
normal charging (charger voltage greater than total rated voltage): the first switch is closed and the second and third switches are open.
Step-down charging (charger voltage less than total rated voltage, but greater than rated voltage of single cell): as shown in fig. 3, the first switch is open and the second and third switches are closed.
According to the battery control method suitable for two charging voltages provided by the invention, the battery control circuit suitable for two charging voltages is adopted to execute the following steps:
s1, checking the voltage of the first battery and the second battery, and judging whether the voltage difference between the first battery and the second battery is within a preset range;
s2, if the judgment result is negative, disconnecting the first switch, connecting the battery with higher voltage to the load on the whole vehicle side for discharging by controlling the second switch and the third switch, suspending the battery with lower voltage until the voltage difference reaches the preset range, and then executing S3;
if yes, go to S3 directly;
s3, when the voltage of the charger is larger than the rated voltage of a single battery and smaller than the total rated voltage of the first battery and the second battery, opening the first switch, closing the second switch and the third switch, and charging the first battery and the second battery in parallel;
and when the voltage of the charger is greater than the total rated voltage of the first battery and the second battery, closing the first switch, and opening the second switch and the third switch to charge the first battery and the second battery in series.
In practical application, such as on an electric vehicle, the simplified high-voltage electrical schematic diagram is shown in fig. 4Shown in the figure. VB1Is not strictly equal to VB2. At this time, if the switches K42, K43, V are directly closedB1And VB2Will result in a large current being generated in the circuit. To avoid this, V can be checked before closing the switchB1And VB2The higher voltage part is firstly connected to the load of the whole vehicle for discharging until VB1And VB2When the differential pressure reaches a sufficiently small value, the vehicle load is disconnected again and then the connection of fig. 3 is returned to the step-down charging.
For example, when V is detectedB1>VB2And V isB1-VB2>A threshold value. On the basis of fig. 4, K42, K2, K1, and one or more load(s) on the vehicle side, such as K21, can be closed. The electrical schematic is now shown in figure 5. At this point, it is achieved that battery B1 discharges the entire vehicle load (thereby reducing the voltage), while B2 floats (the voltage remains unchanged). Up to VB1When the values are lowered to the appropriate values, K42, K2, K1 are opened, returning to FIG. 2.
Similarly, when V is detectedB2>VB1And V isB2-VB1>A threshold value. On the basis of fig. 4, K43, K2, K1, and one or more vehicle-side loads can be closed. At this point, it is achieved that battery B2 discharges the entire vehicle load (thereby reducing the voltage), while B1 floats (the voltage remains unchanged). Up to VB2When the values are lowered to the appropriate values, K42, K2, K1 are opened, returning to FIG. 2.
A typical applicable scenario of the circuit is that when the rated voltage of the electric vehicle is 700V, a charging pile with the voltage of more than 700V is generally used for charging. If the circuit that this patent used is equipped with, when meeting the stake of charging of 350V, still can carry out the benefit electric operation.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A battery control circuit adapted to accommodate two charging voltages, comprising:
a first battery and a second battery connected in series;
a first switch connected in series between the first battery and the second battery;
the second switch is connected in parallel with the first battery and the two outer ends of the first switch;
and the third switch is connected in parallel with the second battery and the two outer ends of the first switch.
2. The battery control circuit according to claim 1, wherein, during charging:
the first switch is closed, and the second switch and the third switch are open; alternatively, the first and second electrodes may be,
the first switch is open and the second and third switches are closed.
3. The battery control circuit of claim 1, wherein the first switch, the second switch, and the third switch comprise: MOSFET, IGBT, relay or air switch.
4. The battery control circuit adapted to two charging voltages of claim 1, wherein the positive electrode of the first battery is connected to the positive electrode of the charger and the positive electrode of the vehicle load, and the negative electrode of the second battery is connected to the negative electrode of the charger and the negative electrode of the vehicle-side load.
5. The battery control circuit according to claim 1, wherein the first battery and the second battery have the same rated voltage.
6. A battery control method adapted to two charging voltages, characterized in that, by using the battery control circuit adapted to two charging voltages of claim 1, the following steps are performed:
s1, checking the voltage of the first battery and the second battery, and judging whether the voltage difference between the first battery and the second battery is within a preset range;
s2, if the judgment result is negative, disconnecting the first switch, connecting the battery with higher voltage to the load on the whole vehicle side for discharging by controlling the second switch and the third switch, suspending the battery with lower voltage until the voltage difference reaches the preset range, and then executing S3;
if yes, go to S3 directly;
s3, when the voltage of the charger is larger than the rated voltage of the single battery and smaller than the total rated voltage of the first battery and the second battery, opening the first switch, closing the second switch and the third switch, and charging the first battery and the second battery in parallel;
and when the voltage of the charger is greater than the total rated voltage of the first battery and the second battery, closing the first switch, opening the second switch and the third switch, and charging the first battery and the second battery in series.
7. The battery control method according to claim 6, wherein the first switch, the second switch, and the third switch comprise: MOSFET, IGBT, relay or air switch.
8. The battery control method adapted to two charging voltages according to claim 6, wherein the positive electrode of the first battery is connected to the positive electrode of the charger and the positive electrode of the vehicle load, and the negative electrode of the second battery is connected to the negative electrode of the charger and the negative electrode of the vehicle-side load.
9. The battery control method adapted to two charging voltages according to claim 6, wherein the rated voltages of the first battery and the second battery are equal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911120099.8A CN110867918A (en) | 2019-11-15 | 2019-11-15 | Battery control circuit suitable for two charging voltages and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911120099.8A CN110867918A (en) | 2019-11-15 | 2019-11-15 | Battery control circuit suitable for two charging voltages and control method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208820A (en) * | 2010-03-29 | 2011-10-05 | 比亚迪股份有限公司 | Energy storage battery pack parallel-connection device and control method thereof |
| CN106655307A (en) * | 2015-11-03 | 2017-05-10 | 北京普莱德新能源电池科技有限公司 | Battery pack equalization circuit |
| CN110352543A (en) * | 2018-09-30 | 2019-10-18 | 深圳欣锐科技股份有限公司 | A kind of charging system and vehicle of vehicle |
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- 2019-11-15 CN CN201911120099.8A patent/CN110867918A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208820A (en) * | 2010-03-29 | 2011-10-05 | 比亚迪股份有限公司 | Energy storage battery pack parallel-connection device and control method thereof |
| CN106655307A (en) * | 2015-11-03 | 2017-05-10 | 北京普莱德新能源电池科技有限公司 | Battery pack equalization circuit |
| CN110352543A (en) * | 2018-09-30 | 2019-10-18 | 深圳欣锐科技股份有限公司 | A kind of charging system and vehicle of vehicle |
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Application publication date: 20200306 |