CN113997811A - Charger of power battery and charging method thereof - Google Patents
Charger of power battery and charging method thereof Download PDFInfo
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- CN113997811A CN113997811A CN202111121174.XA CN202111121174A CN113997811A CN 113997811 A CN113997811 A CN 113997811A CN 202111121174 A CN202111121174 A CN 202111121174A CN 113997811 A CN113997811 A CN 113997811A
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- charging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a charger for a power battery, which comprises a charging unit, a central processing unit and a power supply conversion unit for supplying power to the charging unit, wherein the central processing unit controls the power supply conversion unit to output current to supply power to the charging unit, and the central processing unit controls the current output by the power supply conversion unit to comprise first fast charging current at intervals. The charger for the power battery is beneficial to the service life of the power battery, and is low in cost and safe.
Description
Technical Field
The invention relates to the field of charging of power batteries.
Background
The power battery that present electric motor car used is at the in-process that charges, in order to reduce the charger cost, use the undercurrent to charge to power battery usually, however the undercurrent charges one side and charges the face speed too slowly, on the other hand also does not benefit to power battery's life, for improving the speed of charging and improving power battery's life, can use continuous heavy current to charge to power battery, the charger that nevertheless uses continuous heavy current needs to use powerful power converter, the power of transformer need reach hundred watts usually, even higher, this will cause power battery's charger manufacturing cost to increase greatly, surpass the receiving range in market completely, high-power charger is when heavy current continuous charging in addition, easily give out heat and produce high temperature, produce the potential safety hazard.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a charger for a power battery, including a charging unit, a central processing unit, and a power conversion unit for supplying power to the charging unit, wherein the central processing unit controls the power conversion unit to output current to supply power to the charging unit, and is characterized in that the central processing unit controls the current output by the power conversion unit to include first fast charging currents at intervals.
Further, the central processing unit controls the power conversion unit to output 0 current or small current between the first fast charging currents of the interval.
Further, the duration of the pulse train of the first fast charging current of the interval is less than the duration of the pulse train of the 0 current or the pulse train of the small current.
Further, the ratio of the duration of the pulse train of the first fast charging current to the duration of the pulse train of less than 0 or the pulse train of the small current is in the range of 1:4 to 1: 5.
Further, when the rated capacity of the power battery is C ampere, the magnitude of the first fast charging current at the interval is more than 0.2C ampere and less than 1.5C ampere.
Further, the central processing unit controls the power conversion unit to stop outputting the first fast charging current at the interval, and outputs a second slow charging current, wherein the second slow charging current is smaller than the first fast charging current.
Further, the second slow charging current is a continuous second slow charging current or an interval second slow charging current.
Further, the magnitude of the second slow charging current is larger than 0.015C ampere and smaller than 0.2C ampere.
Further, the power conversion unit comprises a DC-DC transformer, and the power of the DC-DC transformer is more than 100W.
Further, the power of the DC-DC transformer is greater than 144W.
Further, the central processing unit controls the primary of the DC-DC transformer of the power conversion unit by pulse width modulation.
Further, the charging device further comprises a current detection circuit for detecting the charging current of the charging unit or/and a voltage detection circuit for detecting the charging voltage of the charging unit, and the central processing unit controls the power supply conversion unit according to the charging current detected by the current detection circuit and/or the charging voltage detected by the voltage detection circuit.
The invention also discloses a charging method of the charger for the power battery.
The charger for the power battery is beneficial to the service life of the power battery, and is low in cost and safe.
Drawings
FIG. 1 shows a block circuit diagram of the charger of the present invention;
fig. 2 shows a schematic circuit diagram of the charger of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in fig. 1, a schematic diagram of a charger according to the present invention, taking a lead-acid storage battery 100 as an example, a charger 1 for charging a power battery 100 includes a central processing unit 2, a charging unit 3, and a power conversion unit 4, where the power conversion unit 4 is electrically connected to the charging unit 3 for supplying power to the charging unit 3, the central processing unit 2 is electrically connected to the charging unit 3 for detecting a charging current and a charging voltage of the charging unit 3, the central processing unit 2 is electrically connected to the power conversion unit 4 for controlling the power conversion unit 4 to output a required charging current, and the charging unit 3 is electrically connected to the power battery 100 for charging the power battery 100. The central processing unit 2 can control the power conversion unit 4 to output the required current, and when the charging unit 3 needs to charge the power battery 100 with the interval large current, the central processing unit 2 can control the power conversion unit 4 to output the interval large current, namely the first quick charging current; when the central processing unit 2 detects that the charging unit 3 needs to be charged with continuous or intermittent small current, that is, the charging is performed with second slow charging current, the central processing unit 2 controls the power conversion unit 4 to output the second slow charging current, and the second slow charging current is smaller than the first fast charging current; the charger 1 can control the power conversion unit 4 to output the required current magnitude and current output form, especially to provide the large current of the output interval, so that the service life of the power battery is prolonged, and the cost of the power conversion unit 4 is reduced. For example, the power lead-acid storage battery 100 is used for providing power for an electric bicycle, in order to improve the charging effect, when the rated capacity of the power battery is C ampere, the magnitude of the first alternate fast charging current is preferably greater than 0.2C ampere and less than 1.5C ampere, for example, the power lead-acid storage battery with the model number of 48V12AH is the battery with the minimum capacity in the current electric vehicle market, the magnitude of the first fast charging current is 2.4A-18A, the power of a charging transformer is 144W-1080W, preferably 4A-18A, and the power of the charging transformer is 240W-1080W; for a power lead-acid storage battery with the model number of 48V20AH, the size of the first quick charging current is 4A-30A, and the power of the charging transformer is 240W-1800W; as the capacity and voltage of the power battery increase, the power of the charger increases accordingly. The power conversion unit 4 is controlled to output the first fast charging current at intervals for charging, so that the service life of the power battery is prolonged, and the cost of the power conversion unit 4 is reduced. The central processing unit can also control the power supply conversion unit to output the first fast charging current at intervals according to requirements, and only outputs the first fast charging current at intervals to charge the power battery.
As shown in fig. 2, the charger 1 of the present invention further includes a current detection circuit 5 for detecting the charging current of the charging unit 3 or/and a voltage detection circuit 6 for detecting the charging voltage of the charging unit 3, and the central processing unit 2 controls the power conversion unit to output the required charging current through the charging current detected by the current detection circuit and/or through the charging voltage detected by the voltage detection circuit. The power conversion unit 4 includes a DC-DC transformer 7, the DC-DC transformer 7 includes a primary side and a secondary side, and the controlling of the first fast charging current of the output interval of the DC-DC transformer 7 of the power conversion unit 4 by the central processing unit 2 may be realized by controlling the primary side of the transformer 7 of the power conversion unit through pulse width modulation. The power supply L, N is connected to the lightning protection, EMI and PFC for rectification, and drives the MOS tube through CPU pulse control, and the output of the transformer is rectified and the current or/and voltage is detected to realize the closed-loop control of the pulse current and the voltage. Outputting a first fast charging current positive pulse according to a periodic proportion of a process requirement by controlling a transformer, such as: the pulse train of the first fast charging current and 0 or the pulse train of the first fast charging current and the small current, namely the alternate first fast charging current, preferably the pulse train duration of the first fast charging current is less than the pulse train duration of 0 or the pulse train duration of the small current, and particularly the ratio of the pulse train duration of the first fast charging current to the pulse train duration of less than 0 or the pulse train duration of the small current is between 1:4 and 1:5, so that the charger cost is reduced, and the power battery can be repaired. When the power battery needs to be charged continuously with a small current or charged at intervals with a small current, the central processing unit 2 can switch the control mode to control the DC-DC transformer to output a proper small current for charging. The charger of the present invention can output any required charging mode, such as a three-stage charging mode, such as intermittent large current, constant voltage current, trickle small current charging, continuous or intermittent current charging at constant voltage current and trickle small current, and other charging modes.
The high-power charger realizes the interval rapid charging of the large current of the power battery, reduces the volume of the transformer and the power of related power devices, reduces the cost of the charger, realizes the rapid charging effect with low cost and high performance, prolongs the service life of the battery, and realizes the repair of the power battery. The power of the transformer for the high-power charger is more than 100W, preferably more than 144W, so that the aim of the invention can be better realized.
The charger of the invention does not need to acquire the related information of the power battery, is particularly suitable for a portable high-power charger carried by a user, can reduce the manufacturing cost of the charger, can also quickly charge the power battery, can also prolong the service life of the power battery, remove vulcanization, increase the single use time of the power battery, and realizes the effective integration of the cost of the charger and the charging effect.
The invention relates to a charging method of a charger, which comprises the following steps: starting charging; the central processing unit controls the power supply conversion unit to output a first quick charging current at intervals; and the central processing unit controls the power supply conversion unit to output a second slow charging current, wherein the second slow charging current is smaller than the first fast charging current. The central processing unit controls the output current of the power conversion unit, preferably controls the output current of the power conversion unit according to the charging current and/or the charging voltage of the charging unit, and particularly controls a second slow charging current, wherein the second slow charging current can be continuous or intermittent, and the intermittent second slow charging current can prolong the service life of the battery and prolong the single use time of the power battery. The first quick charging current is output at intervals, namely, the service life of the battery can be prolonged, the battery can be repaired, the cost of the charger can be reduced at intervals of large current, and the trickle charging can be realized by the second current, namely, the small current. Of course, the central processing unit may also control the power conversion unit to output the first fast charging current at intervals as required, and only output the first fast charging current at intervals to charge the power battery.
In addition, the power battery 2 of the high-power charger of the invention is a lead-acid storage battery, and can also be other secondary batteries, such as: lead-carbon batteries, lithium ion batteries, nickel-zinc batteries, and the like, and are used for power batteries which supply power to electric bicycles, electric vehicles, and the like and need a high-power charger to charge.
In addition, compared with the existing quick charging current charger, the charger of the invention has the advantages of low cost of the transformer, reduced use of parts such as a power tube, a radiator and the like, convenient control, quicker response, higher efficiency and easier realization of interval quick charging current by directly controlling the transformer, and is also beneficial to prolonging the service life of a battery and improving the safety of large-current charging of a high-power charger. The charger for the power battery is beneficial to the service life of the power battery, and is low in cost and safe.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (18)
1. The charger for the power battery comprises a charging unit, a central processing unit and a power conversion unit, wherein the power conversion unit is used for supplying power to the charging unit, the central processing unit controls the power conversion unit to output current to the charging unit for supplying power, and the charger is characterized in that the central processing unit controls the current output by the power conversion unit to comprise first fast charging current at intervals.
2. The power battery charger according to claim 1, wherein the cpu controls the power conversion unit to output 0 current or a small current between the first fast charging currents in the interval.
3. A charger for a power cell according to claim 2, wherein the duration of said alternate first fast charge current pulse train is less than the duration of a 0 current pulse train or a low current pulse train.
4. A charger for a power cell according to claim 3, wherein the ratio of the duration of the pulse train of the first fast charging current to the duration of the pulse train of less than 0 or the pulse train of the low current is in the range of 1:4 to 1: 5.
5. A charger for power batteries according to any one of claims 1 to 4, wherein the magnitude of said spaced first fast charging currents is greater than 0.2C ampere and less than 1.5C ampere when the rated capacity of the power battery is C ampere.
6. The charger according to claim 5, wherein said CPU controls said power conversion unit to stop outputting a first fast charging current at said interval and output a second slow charging current, said second slow charging current being smaller than said first fast charging current.
7. The power battery charger of claim 6, wherein the second slow charge current is a continuous second slow charge current or an intermittent second slow charge current.
8. The power cell charger of claim 7, wherein the second slow charge current is greater than 0.015C amps and less than 0.2C amps.
9. A charger for power batteries according to any one of claims 1 to 4, characterized in that said power conversion unit comprises a DC-DC transformer, said DC-DC transformer having a power of more than 100W.
10. A charger for power cells according to claim 9, wherein said DC-DC transformer has a power of more than 144W.
11. The power battery charger of claim 9, wherein said cpu controls the primary of the DC-DC transformer of said power conversion unit by pwm.
12. The power battery charger according to any one of claims 1-4, further comprising a current detection circuit for detecting a charging current of said charging unit and/or a voltage detection circuit for detecting a charging voltage of said charging unit, wherein said central processing unit controls said power conversion unit according to the charging current detected by said current detection circuit and/or the charging voltage detected by said voltage detection circuit.
13. A charging method of a charger for a power battery, the charger including a charging unit, a central processing unit, a power conversion unit for supplying power to the charging unit, a current detection circuit for detecting a charging current of the charging unit or/and a voltage detection circuit for detecting a charging voltage of the charging unit, the method comprising the steps of: starting charging; and the central processing unit controls the power supply conversion unit to output a first quick charging current at intervals according to the charging current or/and the charging voltage of the charging unit.
14. The method of claim 13, wherein the cpu controls the power conversion unit to stop outputting a first fast charging current according to the charging current or/and the charging voltage of the charging unit, and then outputs a second slow charging current, wherein the second slow charging current is smaller than the first fast charging current.
15. The method of charging a charger for a power battery of claim 14, wherein said second slow charging current is a continuous second slow charging current or an intermittent second slow charging current.
16. A method of charging a charger for a power battery according to any one of claims 13 to 15, wherein said power conversion unit comprises a DC-DC transformer, said DC-DC transformer comprising a primary, said central processing unit controlling said power conversion unit to modulate said primary of said DC-DC transformer, said DC-DC transformer having a power of more than 100W.
17. A method of charging a charger for a power cell according to any one of claims 13 to 15, wherein the magnitude of the first alternate fast charging current is greater than 0.2 and less than 1.5C amps when the rated capacity of the power cell is C amps.
18. A charging method of a charger for power battery as claimed in any one of claims 13-15, wherein said central processing unit controls said power conversion unit to output 0 current or small current between said spaced first fast charging currents, and the pulse train duration of said spaced first fast charging currents is less than the pulse train duration of 0 current or small current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111121174.XA CN113997811A (en) | 2021-09-24 | 2021-09-24 | Charger of power battery and charging method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111121174.XA CN113997811A (en) | 2021-09-24 | 2021-09-24 | Charger of power battery and charging method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113997811A true CN113997811A (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111121174.XA Withdrawn CN113997811A (en) | 2021-09-24 | 2021-09-24 | Charger of power battery and charging method thereof |
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| CN (1) | CN113997811A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115995801A (en) * | 2023-02-09 | 2023-04-21 | 上海拿森汽车电子有限公司 | Power supply device and system for vehicle body stabilization system and vehicle |
-
2021
- 2021-09-24 CN CN202111121174.XA patent/CN113997811A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115995801A (en) * | 2023-02-09 | 2023-04-21 | 上海拿森汽车电子有限公司 | Power supply device and system for vehicle body stabilization system and vehicle |
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Application publication date: 20220201 |