CN2888660Y

CN2888660Y - Battery charge balancing device

Info

Publication number: CN2888660Y
Application number: CNU2006200537830U
Authority: CN
Inventors: 周海
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-01-09
Filing date: 2006-01-09
Publication date: 2007-04-11
Anticipated expiration: 2016-01-09

Abstract

The utility model discloses a battery charging balancer, which is a shunt device parallel to rechargeable battery, comprises battery charging balancing circuit and shell enclosing the circuit; said battery charging balancing circuit comprises shunt element and switch module, said packaging shell includes heat sink, said flaky heating resistor is fixed close to heat sink. Charging balancing circuit of the utility model is connected with single battery of battery pack in parallel, switch module is set to be connected when the battery reaches limit voltage, shunt element is used for shunt, so as to reduce charging current of the battery at question, after shunting, during normal charging of adjacent batteries, low current is provided to continue to charge, after charging adjustment for several times, charging balance of battery pack may be realized completely; flaky ceramic power resistance is used as shunt resistance to overcome problems generated by using common cylindrical resistance, such as centralized heating, impossible heat elimination, distortion of plastic shell due to superheat.

Description

The battery charge balancer

Technical field

The utility model relates to the ancillary technique that charges the battery, and particularly relates to a kind of battery charge balancer that is used for series battery.

Background technology

In the middle of the polyphone battery pack, because production technology all exists bigger difference at aspects such as capacity, internal resistances.If the capacity of certain single battery or internal resistance are too high when charging normal, the voltage of this batteries (problem battery) just the overtension phenomenon will inevitably occur so, thereby arrive deboost (weighing apparatus is pressed) in advance than adjacent cell, if do not limited this moment, voltage will continue to rise.Overtension can produce corresponding different damage to dissimilar rechargeable batteries.As, to lead-acid battery, overtension will cause a large amount of gassings of battery and dehydration (electrolyte solution loss).Through going round and beginning again, the vicious circle charging will appear in the problem battery, thereby because of dehydration too much causes damaging in advance, cause adjacent cell also because of overcharging phenomenons such as causing thermal runaway, dehydration then, make it thorough damage.

Summary of the invention

The purpose of this utility model is exactly in order to overcome the above problems, provide a kind of when being used to prevent series battery charge single battery overcharge or owe to fill, suppresses the battery charge balancer that the vicious circle of problem battery is charged and dispelled the heat good;

For achieving the above object, the utility model has adopted following technical scheme: a kind of battery charge balancer is to be used for the part flow arrangement in parallel with rechargeable battery, comprises battery charge balancing circuitry and the housing that this circuit is encapsulated; Described battery charge balancing circuitry comprises vent diverter and switch module, and described vent diverter adopts the sheet heating resistor, and described switch module is open-minded when shunt voltage surpasses set point, in described vent diverter place in circuit; Draw from encapsulating in the housing respectively at described battery charge balancing circuitry the two poles of the earth in parallel with rechargeable battery; Described encapsulating housing comprises fin, and described sheet heating resistor is close to fin and is fixed.

Preferably, described fin is promptly as the part shell of described encapsulating housing, and described sheet heating resistor adopts flaky pottery resistance.

Preferably, other elements in the described battery charge balancing circuitry except that the sheet heating resistor all are installed on the circuit board, and circuit structure is more compact like this, are convenient to encapsulation.

Adopt such scheme, the utility model beneficial technical effects is:

Charge balancing circuit of the present utility model is by on the single battery that is connected in parallel on battery pack, setting makes switch module conducting when battery reaches deboost, and utilize vent diverter to shunt, can reduce the charging current of this problem battery, and the continuation of also giving with less electric current when adjacent cell charges normal after shunting charging, after charging is adjusted for several times, can realize the charging balance of battery pack fully.

The ceramic power resistor that battery charge balancer of the present utility model passes through to use sheet is as shunt resistance, and the heating that has overcome the generation of employing plain cylindrical form resistance is concentrated, heat can't get rid of and cause plastic casing because of overheated problem of being out of shape.

The utility model adopts heat dissipation metal plate and sheet shunt resistance to be close to, and can make the heat of the shunt resistance generation of pottery conduct to the metallic plate heat radiation fast, has enlarged area of dissipation, avoids causing the plastic casing distortion because of local overheating.

Balancer of the present utility model is widely used in the charging balanced protection of all kinds of polyphone lead-acid battery groups, is specially adapted to the supporting use of lead-acid battery group, also is fit to the use of installing additional in maintenance market.Dispose the normal operating period that can prolong battery behind this circuit greatly.And circuit of the present utility model and balancer are simple in structure, and volume is little, the precision height, and cost is low, and is easy for installation.

Description of drawings

Also in conjunction with the accompanying drawings the utility model is described in further detail below by specific embodiment.

Fig. 1 is the external structure schematic diagram of a kind of battery charge balancer of the present utility model.

Fig. 2 is the side structure schematic diagram of battery charge balancer reserve part shell among Fig. 1.

Fig. 3 is a kind of battery charge balancing circuitry schematic diagram.

Embodiment

Embodiment one, a kind of battery charge balancer as shown in Figure 1 and Figure 2, comprise housing and battery charge balancing circuitry.This battery charge balancing circuitry comprises vent diverter 21 and switch module 22, and its vent diverter 21 adopts the flaky pottery power resistor, and switch module 22 is installed on the circuit board, and the entire circuit structure is more compact like this, is convenient to encapsulation.Described switch module is open-minded when shunt voltage surpasses set point, in described vent diverter place in circuit.

The battery charge balancing circuitry is used for the two poles of the earth in parallel with rechargeable battery and draws from encapsulating housing respectively; A sidewall of encapsulating housing is made of metal fin 11, and remainder is the plastic packaging shell.It is fixing that flaky pottery power resistor 21 is close to fin 11, to reach better heat radiating effect.Circuit board 22 is fixed in the encapsulating housing.Because metal fin 11 parts as housing own, one side is close to pellet resistance 21, and another side is exposed to the balancer outside, is beneficial to heat radiation.This balancer adopts plastic package process to make aluminium sheet, circuit module, sheet shunt resistance form an integral body, thus good heat dissipation effect, good looking appearance, easy for installation.

For better understanding the utility model, provide a kind of battery charge balancing circuitry of the present utility model that can be used for below.Mandatory declaration be that following circuit only for realizing a kind of possibility of this patent, does not constitute any restriction to the utility model encapsulating structure.Those skilled in the art can carry out various variations and not exceed protection range of the present utility model by the concrete structure to this circuit in the scope of existing knowledge.

As shown in Figure 3, comprise resistance R 4 and the switch module that is used as vent diverter.Described switch module comprises the cascade switching circuit that is made of triode Q1, Q2; The voltage setting circuit that constitutes by current-limiting resistance R1, R2, W1 and voltage stabilizing didoe AZ1 series connection; And capacitor C 1.Wherein resistance W1 is an adjustable slide rheostat.

The switch terminals of triode Q2 is as the switch terminals series resistance R4 of switching circuit, the conducting of triode Q2 with whether in the place in circuit rechargeable battery is shunted by controlling resistance R4, the state of Q2 is by its higher level's switching tube Q1 control, and the control end of Q1 inserts in the voltage setting circuit as the control end of switching circuit.Here the purpose that adopts the two-stage switch controlled is in order to improve the accuracy of circuit control, also can only use a switching tube or a plurality of cascade switching tube to control in principle, but the single-stage control precision is not high enough, and progression too much can cause the circuit complexity, increase cost, and to not significantly effect of control precision.

Voltage setting circuit external charge battery in parallel is made of R2, the W1, AZ1 and the R1 that connect successively, and the control end of Q1 is connected between W1 and the AZ1.When charging voltage was higher than the reverse breakdown voltage of AZ1, AZ1 was open-minded, and the control end of Q1 promptly has electric current to flow through, and along with the Control current of the rising Q1 of shunt voltage constantly strengthens, when reaching certain intensity, Q1 is promptly open-minded.The relation of the rising of shunt voltage and Q1 base current is determined by the resistance of current-limiting resistance, therefore, can change the shunting magnitude of voltage of this battery charge balancing circuitry by adjustment slide rheostat W1.Certainly, if only need to determine unique shunting magnitude of voltage, also can replace slide rheostat W1 with conventional, electric-resistance.In addition, for fear of unexpected reverse current occurring, return diode D3 identical of AZ1 series connection with the shunt voltage direction.

In order to improve the stability of circuit, also increase is provided with a capacitor C 1 external charge battery in parallel.

During work, with the single battery in the rechargeable battery set of being parallel to of this circuit, the both positive and negative polarity of noting making battery is the negative positive pole of corresponding voltage stabilizing didoe respectively.In the present embodiment, the deboost of rechargeable battery is 14.6V, and the puncture voltage of voltage stabilizing didoe AZ1 is 13V, when voltage is lower than 13V, and this not conducting of balancing circuitry, thus realize zero-power.By adjusting the resistance of W1, Q2 begins conducting when making shunt voltage be 14.6V, thus electric current shunt by the R4 bypass, to reduce the charging current of this problem battery.The continuation of also giving with less electric current when shunting back adjacent cell charges normal is charged, and can realize the charging balance of battery pack after charging is adjusted for several times fully.

Claims

1, a kind of battery charge balancer is to be used for the part flow arrangement in parallel with rechargeable battery, it is characterized in that: comprise battery charge balancing circuitry and the housing that this circuit is encapsulated; Described battery charge balancing circuitry comprises vent diverter and switch module, and described vent diverter adopts the sheet heating resistor, and described switch module is open-minded when shunt voltage surpasses set point, in described vent diverter place in circuit; Draw from encapsulating in the housing respectively at described battery charge balancing circuitry the two poles of the earth in parallel with rechargeable battery; Described encapsulating housing comprises fin, and described sheet heating resistor is close to fin and is fixed.

2, battery charge balancer according to claim 1 is characterized in that: described fin is as the part shell of described encapsulating housing, and described sheet heating resistor adopts flaky pottery resistance.

3, battery charge balancer according to claim 2 is characterized in that: other elements in the described battery charge balancing circuitry except that the sheet heating resistor all are installed on the circuit board, and described circuit board is fixed in the described encapsulating housing.