CN201594570U

CN201594570U - Rechargeable battery equalization management system

Info

Publication number: CN201594570U
Application number: CN200920262960XU
Authority: CN
Inventors: 徐成宪; 石渊爱
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-11-18
Filing date: 2009-11-18
Publication date: 2010-09-29
Anticipated expiration: 2019-11-18

Abstract

The utility model provides a rechargeable battery equalization management system, which comprises a battery pack, a voltage acquisition module, an overvoltage operation module and an equalizing discharge module. The battery pack is formed by serially connecting a plurality of single batteries, the voltage acquisition module is used for acquiring voltage value of each single battery in the battery pack, the overvoltage operation module is used for respectively comparing the voltage value of each single battery outputted by the voltage acquisition module with preset overvoltage threshold value, when voltage value of a certain single battery exceeds the preset overvoltage threshold value, the overvoltage operation module outputs a driving signal corresponding to the single battery, the equalizing discharge module consists of a plurality of control units and is respectively connected with an anode and a cathode of each single battery, and when receiving the driving signal outputted by the overvoltage operation module, the driving signal drives the corresponding control unit to control the corresponding single battery thereof to discharge until voltage value of the single battery equals to the preset threshold value. The rechargeable battery equalization management system can prevent the batteries from expanding and exploding due to over-charging or losing efficacy due to over-discharging, thereby greatly increasing safety of the batteries and prolonging effective service life thereof.

Description

A kind of rechargeable battery balanced management system

Technical field

The utility model relates to the protective circuit of rechargeable battery, relates in particular to a kind of balanced management system that is used for power lithium-ion battery.

Background technology

The power recharge battery need be together in series some joint Li-Ion rechargeable batteries in use mostly, has reached the running that needed enough big voltage removes drive motor; Such as electric bicycle, electric automobile etc.; Because each monomer of lithium ion battery can not be in full accord on performance index, in use because the difference of capacity, self discharge between each monomer etc., after using a period of time, the retention of charge of battery pack obviously reduces, and has influenced it and has further promoted the use of; Therefore, when the series connection of more piece rechargeable battery was used, the quality of its performance not only depended on the quality quality of cell, also depends on the performance of battery pack integral body; There has been the multiple battery management system in the market; usually be referred to as BMS or baffle; but these BMS baffles do not have the ability of equalization substantially; even all do not have balanced this function; just play a monitoring, can't control effectively and manage the electrokinetic cell super-charge super-discharge to the battery pack internal state.

The utility model content

At above-mentioned the problems of the prior art, how safe and reliable the good battery pack of management when the purpose of this utility model is to provide the inner monomer electricity of a kind of better solution battery pack core consistency very poor make battery not occur overcharging and expand or blast.

For solving the problems of the technologies described above, the utility model provides a kind of rechargeable battery balanced management system, and it comprises the battery pack that is in series by the more piece cell, also comprises:

Voltage acquisition module is used for gathering the magnitude of voltage of the every joint cell of described battery pack;

The overvoltage computing module, be used for the magnitude of voltage of every joint cell of described voltage acquisition module output is compared with default overvoltage threshold respectively, when the magnitude of voltage of certain joint cell surpasses default overvoltage threshold, then export a drive signal corresponding to this joint cell to the balanced discharge module;

The balanced discharge module, form by several control units, link to each other with the both positive and negative polarity that respectively saves cell in the battery pack respectively, when receiving the drive signal of described overvoltage computing module output, this drive corresponding control unit is controlled the overvoltage threshold that its corresponding cell discharge equals to preset up to the magnitude of voltage of this joint cell.

Particularly, the control unit of described balanced discharge module is made of field effect transistor, and the source electrode of field effect transistor joins by a utmost point of a high-power resistance and a cell, and the drain electrode of field effect transistor another utmost point direct and this cell joins; The grid of field effect transistor links to each other with described overvoltage computing module by a resistance, is used to receive the drive signal of overvoltage computing module output.

This rechargeable battery balanced management system can also comprise: under-voltage computing module, be used for the magnitude of voltage of every joint cell of described voltage acquisition module output respectively with default under-voltage threshold, when the magnitude of voltage of certain joint cell is lower than default under-voltage threshold value, then export a drive signal corresponding to this joint cell; The undervoltage warning module is used for reporting to the police according to the drive signal of described under-voltage computing module output.

Particularly, described undervoltage warning module is made up of several LED lamps, a cell in the corresponding described battery pack of each LED lamp, and the LED lamp of the drive correspondence of described under-voltage computing module output is luminous under-voltage to show corresponding cell.

Because the utility model utilizes the balanced discharge module to help the cell discharge of charging overvoltage, makes battery not occur overcharging and expands or blast, the good battery pack of management that can be more safe and reliable.

Description of drawings

Accompanying drawing 1 is a kind of rechargeable battery balanced management system of the utility model structure chart in one embodiment;

Accompanying drawing 2 is a kind of rechargeable battery balanced management system of the utility model detailed circuit diagram in one embodiment.

Embodiment

How safe and reliable the purpose of this utility model be in order better to solve the inner monomer electricity of battery pack core consistency good battery of management very poor the time; Make battery expansion, blast not occur overcharging and cross and put inefficacy, thereby greatly strengthen the fail safe and the useful life of battery.

With reference to figure 1, a kind of rechargeable battery balanced management system of the present utility model, it is used for the balanced management to the battery pack 1 that is in series by the more piece cell, and this system comprises:

Voltage acquisition module 2 is used for gathering the magnitude of voltage of described battery pack 1 every joint cell; Its both positive and negative polarity that connects each cell in battery pack with detect the current magnitude of voltage of each cell, if will connect N cell, then have N+1 root lead to be connected to voltage acquisition module,

Overvoltage computing module 3, be used for the magnitude of voltage of every joint cell of described voltage acquisition module output is compared with default overvoltage threshold respectively, when the magnitude of voltage of certain joint cell surpasses default overvoltage threshold, then export a drive signal corresponding to this joint cell to the balanced discharge module;

Balanced discharge module 4, form by several control units, link to each other with the both positive and negative polarity that respectively saves cell in the battery pack respectively, when receiving the drive signal of described overvoltage computing module output, this drive corresponding control unit is controlled the overvoltage threshold that its corresponding cell discharge equals to preset up to the magnitude of voltage of this joint cell.Particularly, the control unit of balanced discharge module is realized that by field effect transistor the source electrode of field effect transistor joins by a utmost point of a high-power resistance and a cell, and drain electrode another utmost point direct and this cell joins; The grid of field effect transistor links to each other with described overvoltage computing module by a resistance, is used to receive the drive signal of overvoltage computing module output.

Characteristics of the present utility model are that the ability of equalization is big, and it is consistent with charging current to reach by-pass current.The low on-resistance characteristic of utilizing metal-oxide-semiconductor adds high-power resistance (its decision euqalizing current size) and realizes balanced shunting as the equalizer switch device.

This rechargeable battery balanced management system can also comprise: under-voltage computing module 5, be used for the magnitude of voltage of every joint cell of described voltage acquisition module output respectively with default under-voltage threshold, when the magnitude of voltage of certain joint cell is lower than default under-voltage threshold value, then export a drive signal corresponding to this joint cell; Undervoltage warning module 6 is used for reporting to the police according to the drive signal of described under-voltage computing module output.Particularly, the undervoltage warning module can be made up of several LED lamps, a cell in the corresponding described battery pack of each LED lamp, and the LED lamp of the drive correspondence of described under-voltage computing module output is luminous under-voltage to show corresponding cell.Can certainly realize undervoltage warning with other equipment with warning effect.

With reference to figure 2, the rechargeable battery set of forming with the lithium battery of four series connection is an example; Voltage acquisition module 2 is gathered voltage signal from battery pack, takes over and presses computing module 3 and under-voltage computing module 5, and overvoltage computing module 3 provides drive signal for the control unit 41 that is made of field effect transistor Q1, Q2, Q3, Q4 through resistance R 1, R2, R3, R4.Wherein control unit of R1, Q1 and R9 formation carries out equilibrium control to No. 1 battery, R2, Q2 and R10 constitute a control unit No. 2 batteries are carried out equilibrium control, R3, Q3 and R11 constitute a control unit No. 3 batteries are carried out equilibrium control, and R4, Q4 and R12 constitute a control unit No. 4 batteries are carried out equilibrium control; Wherein the S utmost point of metal-oxide-semiconductor Q1 connects the end of power resistor R9, "-" utmost point of No. 1 battery of another termination of R9 also is "+" utmost point of No. 2 batteries, the D utmost point of Q1 connects "+" utmost point of No. 1 battery, the S utmost point of metal-oxide-semiconductor Q2 connects the end of power resistor R10, "-" utmost point of No. 2 batteries of another termination of R10 also is "+" utmost point of No. 3 batteries, "-" utmost point that the D utmost point of Q2 connects No. 1 battery of battery also is "+" utmost point of No. 2 batteries, the S utmost point of metal-oxide-semiconductor Q3 connects the end of power resistor R11, "-" utmost point of No. 3 batteries of another termination battery of R11 also is "+" utmost point of No. 4 batteries, "-" utmost point that the D utmost point of Q3 connects No. 2 batteries of battery also is "+" utmost point of No. 3 batteries, the S utmost point of metal-oxide-semiconductor Q4 connects the end of power resistor R12, "-" utmost point that "-" utmost point of No. 4 batteries of another termination battery of R12, the D utmost point of Q4 connect No. 3 batteries of battery also is "+" utmost point of No. 4 batteries.

Described metal-oxide-semiconductor Q1, Q2, Q3, Q4 are respectively applied for on-off action, when its both end voltage surpasses certain magnitude of voltage in No. 1 cell charging process, when detecting, exports the overvoltage computing module G utmost point that a drive signal is given resistance R 1 and is sent to Q1, metal-oxide-semiconductor Q1 conducting short-circuit power resistance R 9 is used for No. 1 cell discharge, described power resistor R9, R10, R11, R12 play the effect of euqalizing current size adjustment, the more little euqalizing current of its resistance value is big more, resistance is big more, and euqalizing current is more little.The undervoltage warning module of being made up of LED1, LED2, LED3, LED4 61 is respectively applied for the indication of reporting to the police of batteries monomer battery when under-voltage; Such as when No. 1 cell is under-voltage, LED1 reports to the police luminous so.

Above-described the utility model execution mode does not constitute the qualification to the utility model protection range.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection range of the present utility model.

Claims

1. a rechargeable battery balanced management system comprises the battery pack that is in series by the more piece cell, it is characterized in that, also comprises:

2. rechargeable battery balanced management system as claimed in claim 1, it is characterized in that: the control unit of described balanced discharge module is made of field effect transistor, the source electrode of field effect transistor joins by a utmost point of a high-power resistance and a cell, and the drain electrode of field effect transistor another utmost point direct and this cell joins; The grid of field effect transistor links to each other with described overvoltage computing module by a resistance, is used to receive the drive signal of overvoltage computing module output.

3. rechargeable battery balanced management system as claimed in claim 2 is characterized in that: also comprise:

Under-voltage computing module, be used for the magnitude of voltage of every joint cell of described voltage acquisition module output respectively with default under-voltage threshold, when the magnitude of voltage of certain joint cell is lower than default under-voltage threshold value, then export a drive signal corresponding to this joint cell;

The undervoltage warning module is used for reporting to the police according to the drive signal of described under-voltage computing module output.

4. rechargeable battery balanced management system as claimed in claim 3, it is characterized in that: described undervoltage warning module is made up of several LED lamps, a cell in the corresponding described battery pack of each LED lamp, the LED lamp of the drive correspondence of described under-voltage computing module output is luminous under-voltage to show corresponding cell.