CN212012158U

CN212012158U - Active equalization circuit of rechargeable battery pack

Info

Publication number: CN212012158U
Application number: CN201922161759.9U
Authority: CN
Inventors: 韩冰; 付志永
Original assignee: Shenzhen Jingwei Network Technology Co ltd
Current assignee: Shenzhen Jingwei Network Technology Co ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-11-24
Anticipated expiration: 2029-12-03

Abstract

The utility model discloses a rechargeable battery pack active equalization circuit, which relates to the technical field of battery equalization circuits, and comprises a battery pack, a controller, an external terminal and a switch matrix, wherein the battery pack is formed by connecting N rechargeable batteries in series, the switch matrix is formed by a plurality of groups of switch tubes, and the controller, the external terminal and the battery pack are electrically connected with the switch matrix, the utility model uses two switch matrices, thereby selecting any battery from the battery pack as output and any battery as input, realizing the equalization from the single battery to the single battery, adopting an isolation type buck-boost power converter, the core device of which is a transformer, realizing the isolation of input and output, the input and output are floating, and further allowing the charging and discharging between the single batteries with large mode-sharing voltage difference, thereby realizing large balance current and complex charge-discharge curve.

Description

Active equalization circuit of rechargeable battery pack

Technical Field

The utility model belongs to the technical field of the battery equalizer circuit, specifically be a rechargeable battery group initiative equalizer circuit.

Background

The battery equalization mainly comprises a passive equalization mode and an active equalization mode, wherein the passive equalization mode is that a resistor controlled by a switch is connected in parallel outside each single battery, a system can control whether the resistor is connected with the single battery in parallel, when the resistor is connected with the single battery in parallel, the electric quantity of the single battery is consumed, the electric quantity is converted into heat energy to be dissipated, the voltage of the single battery is reduced, the system always selects the battery with the highest voltage and the highest electric quantity to perform passive equalization until the voltage and the electric quantity of all the batteries are close to each other, and the solution of the passive equalization technology to the wooden barrel short plate is to shorten a long plate, but the passive equalization technology can also play a role in restraining the continuous expansion of battery difference;

the active equalization technology is characterized in that energy in the battery with the highest electric quantity is taken out and injected into the battery with the lowest electric quantity through a specific circuit, so that the advantages of taking the advantages of the advantages and making up the disadvantages are achieved, and compared with passive equalization, the active equalization technology has obvious advantages; energy cannot be wasted, heat cannot be generated, the electric quantity of a system is determined by the average value of the single batteries rather than the worst battery, the factors for actively balancing and widely using are limited, the circuit is complex, the cost is high, and the existing scheme has defects;

the existing active equalization circuit generally divides an active battery string group into a plurality of groups, and only performs active equalization in the group; the existing active equalization circuit realizes the energy flow from a single battery to a battery pack: after the energy of the single battery with the highest electric quantity is taken out, the whole battery pack is charged, or the whole battery pack charges the battery with the lowest electric quantity; the current balancing current of the existing active balancing circuit is usually small due to the limitation of a special chip.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rechargeable battery group initiative equalizer circuit to solve the problem that proposes among the above-mentioned background art.

The utility model adopts the technical scheme as follows:

the utility model provides a chargeable call group initiative equalizer circuit, includes group battery, controller, external terminal and switch matrix, the group battery is established ties by N section chargeable call and is constituteed, the switch matrix comprises multiunit switch tube, controller, external terminal and group battery all with switch matrix electric connection.

Preferably, the controller output adopts MCU or FPGA.

Preferably, one of the switching tubes is electrically connected to a series connection point between two adjacent rechargeable batteries.

The active equalization circuit of the rechargeable battery pack comprises two switch matrix circuits and the battery pack, wherein the two switch matrix circuits are respectively an input switch matrix and an output switch matrix, the battery pack is formed by connecting N battery monomers in series, and the input switch matrix and the output switch matrix are both electrically connected with the battery pack.

Preferably, the active equalization circuit of the rechargeable battery pack further comprises an equalization controller and an isolated boost-buck power converter, wherein an output end of the equalization controller is electrically connected with an input switch matrix, an output switch matrix and an input end of the isolated boost-buck power converter respectively, an output end of the isolated boost-buck power converter is electrically connected with an input end of the input switch matrix, and an input end of the isolated boost-buck power converter is electrically connected with an output end of the output switch matrix.

Preferably, the balance controller comprises a microcontroller, a single chip microcomputer and a programmable logic device.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

the utility model discloses two switch matrixes have been used to thereby can select arbitrary battery as the output from the group battery, arbitrary battery is as the input, monomer battery to monomer battery's equilibrium has been realized, isolated form buck-boost power converter has been adopted, its core device is the transformer, realize input-output's isolation, input-output is unsteady, and then allow to charge and discharge between the very big monomer battery of mode voltage difference altogether, thereby realize very big balanced current and complicated charge-discharge curve.

Drawings

Fig. 1 is a switch matrix unit circuit of the present invention;

fig. 2 shows the active equalization principle of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Example 1

Referring to fig. 1, the active equalization circuit of the rechargeable battery pack comprises the battery pack, a controller, an external terminal and a switch matrix, wherein the battery pack is formed by connecting N rechargeable batteries in series, the switch matrix is formed by a plurality of groups of switch tubes, and the controller, the external terminal and the battery pack are electrically connected with the switch matrix.

The controller adopts MCU or FPGA.

One switching tube is electrically connected with the series connection point between two adjacent rechargeable batteries.

The N single rechargeable batteries are respectively B1-Bn, connection point taps between every two batteries in series connection are respectively S1-Sn, a plurality of switching tubes are respectively Q1-Q24, the path number of control signals of the controller is respectively CTRL _ 01-CTRL _12, when a switching device selected by the controller for communication with a superior controller through a serial interface is an MOSFET, due to the existence of a diode, two MOSFETs are required to be connected in series in a reverse direction (Q1 and Q2, Q3 and Q4, Q5 and Q6 and the like), the Q1 and Q2 are used as advantages, when the CTRL01 is invalid, the Q1 and the Q2 are both turned off, current cannot flow in two directions, and the Q1-Q24 are controlled by the controller to form a switching matrix network which has the functions as follows: in the single rechargeable batteries of B1-Bn, one battery is selected to be connected to the external output interfaces BAT _ N and BAT _ P, for example, when the control signals CTRL _05 and CTRL _08 are effective and the rest control signals are ineffective, Q9, Q10, Q15 and Q16 are conducted, and the rest switching tubes are all turned off. Q9 and Q10 are conducted, and the anode of B3 is connected to an external output interface BAT _ P through a tap S3; q15 and Q16 are conducted, and the negative electrode of B3 is connected to an external output interface BAT _ N through a tap S3.

Example 2

Referring to fig. 2, the active equalization circuit for the rechargeable battery pack comprises two switch matrix circuits and a battery pack, wherein the two switch matrix circuits are an input switch matrix and an output switch matrix respectively, the battery pack is formed by connecting N battery monomers in series, and the input switch matrix and the output switch matrix are both electrically connected with the battery pack.

The output end of the equalization controller is electrically connected with the input switch matrix, the output switch matrix and the input end of the isolated buck-boost power converter respectively, the output end of the isolated buck-boost power converter is electrically connected with the input end of the input switch matrix, and the input end of the isolated buck-boost power converter is electrically connected with the output end of the output switch matrix.

The balance controller comprises a microcontroller, a singlechip and a programmable logic device.

In combination with the embodiment 1-embodiment 2, when the circuit performs active equalization, the controller scans the single batteries through the monitoring circuit, finds the single battery with the highest voltage and the single battery with the lowest voltage in the battery pack, and equalizes the two single batteries; the output switch matrix is controlled through the control signal, and the single battery with the highest voltage is connected to output ends BAT _ P and BAT _ N of the output switch matrix, which are input ends of the isolated boost-buck power converter; the output switch matrix is controlled through the control signal, and the single battery with the lowest voltage is connected to output ends BAT _ P and BAT _ N of the input switch matrix, which are also output ends of the isolated boost-buck power converter; and then the controller completes the balance of the high-voltage battery to the low-voltage battery according to the voltages of the two balanced batteries and the preset balance current and working curve.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. An active equalization circuit for a rechargeable battery pack, comprising: the battery pack is formed by connecting N battery monomers in series, and the input switch matrix and the output switch matrix are both electrically connected with the battery pack;

the output end of the balanced controller is electrically connected with the input switch matrix, the output switch matrix and the input end of the isolated buck-boost power converter respectively, the output end of the isolated buck-boost power converter is electrically connected with the input end of the input switch matrix, and the input end of the isolated buck-boost power converter is electrically connected with the output end of the output switch matrix.