Lossless Charger

• US 20130033225A1
• Filed: 05/10/2011
• Published: 02/07/2013
• Est. Priority Date: 05/18/2010
• Status: Active Grant

• Current Assignee: Baichou Yu
• Original Assignee: Baichou Yu
• Inventors: Yu, Baichou
• Granted Patent: US 9,219,373 B2
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B60L 50/66 Arrangements of batteries
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/19 Switching between serial connection and parallel connection of battery modules
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/0069 Charging or discharging for charge maintenance, battery initiation or rejuvenation
• CPC Class Codes: H02J 7/007184 in response to battery voltage gradient
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A lithium ion power battery lossless charger adopts a charging method of overall serial constant-current and monomer parallel constant-voltage to realize lossless charging on lithium ion power batteries. Lossless includes two implications: one is that charging efficiency is close to 100%, and charging power is basically lossless; and the other one is that charging and discharging are completely based on the characteristic curve of the battery, and the battery per se is completely free of damages in charging and discharging processes. The lossless charger spares a battery management system, all functions of a battery system, a charging system, a discharging system and a maintenance management system are realized only by a simple circuit, and no overcharge, overheating, over discharge, over current or short circuit occurs. The terminal voltages of all monomer batteries are completely equal when charging is finished, and no equalized charging is required. Meanwhile, there aren'"'"'t any complex control chips or software which are easy to be interfered, the charger is safe, reliable, simple and practical, and the cost, volume, weight and power consumption of the charge are all one tenth of those of the traditional charger.

Claims

1. A lithium ion power battery lossless charger, not adopting the PWM control technology and high-frequency power conversion, characterized in that:

the whole machine comprises a charging circuit (1), a discharging circuit (2) and a battery control level (3) via cascading.

2. The lithium ion power battery lossless charger according to claim 1, characterized in that:

the charging circuit (1) comprises a fifth MOS tube (Q5), etc., the grid electrode of the fifth MOS tube (Q5) is connected with the positive electrode of a third driving voltage (V3), the source electrode is connected with the negative electrode of the third driving voltage (V3), the drain electrode is connected with a charging source (V1) via a first resistor (R1), and the negative. electrode of the charging source (V1) is grounded.

3. The lithium ion power battery lossless charger according to claim 1, characterized in that:

the discharging circuit (2) comprises a sixth MOS tube (Q6), etc., the grid electrode of the sixth. MOS tube (Q6) is connected with the negative electrode of a second driving voltage (V2) via a first switch (S1), the source electrode is connected with the positive electrode of the second driving voltage (V2), and the drain electrode is grounded via a fourth resistor (R4);

the positive electrode of a first switch (S1) control side is connected with the positive electrode of the second driving voltage (V2) via a sixth resistor (R6), and the negative electrode is serially connected with a corresponding switch in the battery control level via a second switch (S2); and

the positive electrode of the second switch (S2) control side is connected with the positive electrode of a fourth Zener diode (D4), the negative electrode is grounded via a seventh resistor (R7), and the negative electrode of the fourth Zener diode (D4) is connected with the source electrode of the sixth MOS tube (Q6).

4. The lithium ion power battery lossless charger according to claim 1, characterized in that:

the battery control lever ST1 comprises one lithium ion power battery as well as one parallel voltage-stabilizing circuit Va and one switching circuit SW connected with the lithium ion power battery in parallel, the collecting electrodes of a first and second triodes (Q1, Q2) in the parallel voltage-stabilizing circuit Va and the positive electrode of a second Zener diode (D1) are connected with the positive electrode of a battery E1, one end of a second resistor (R2) and the emitting electrode of the second triode (Q2) are connected with the negative electrode of the battery E1, the other end of the second resistor (R2) is connected with the negative electrode of the second Zener diode (D1) and the base electrode of the first triode (Q1), and the emitting electrode of the first triode (Q1) is connected with the base electrode of the second triode (Q2); and

a third switch (S3) in the switching circuit SW is serially connected with corresponding switches in the previous and next battery control levels, the positive electrode of a third switch (S3) control side is connected with the positive electrode of a third Zener diode (D3), the negative electrode is connected with the negative electrode of the battery at the same level via the sixth resistor (R6), and the negative electrode of the third Zener diode (D3) is connected with the positive electrode of the battery at the same level.

5. The lithium ion power battery lossless charger according to claim 4, characterized in that:

the battery control level can be successively cascaded, the positive electrode of the battery at the first level is connected with the source electrode of the fifth MOS tube (Q5) in the charging circuit, the negative electrode is connected with the positive electrode of the battery in the next battery control level, the positive electrode of the battery at the second battery control level is connected with the negative electrode at the previous battery control level, the negative electrode is connected with the positive electrode of the next battery control level, and the negative electrode of the battery in the last level is grounded, the battery control level can be cascaded via 1-N levels in this cascading method.