CN2582184Y - Energy balance device applied to series connection of large-capacity lithium battery packs - Google Patents

Abstract

The utility model relates to an energy balancing device for series connection large capacity lithium cell group, it mainly constitutes large capacity lithium cell group through the mode of establishing ties, and even be equipped with an energy balancing device between two lithium cells of establishing ties, and this energy balancing device can gain the voltage of two lithium cells and compare its quasi-position, when the voltage of spying two lithium cells has the height difference, pass through this energy balancing device in step promptly, it is lower to deliver to voltage with the electric quantity of the higher lithium cell of voltage, make the electric quantity of two lithium cells balanced, and reach energy evenly distributed's state.

Description

Energy balance device applied to series connection of large-capacity lithium battery packs

technical field

The utility model relates to an energy balance device used in series connection of large-capacity lithium battery packs, especially refers to the formation of large-capacity lithium battery packs through series connection, and the use of an energy balance device connected between two series-connected lithium batteries to make the The power balance and energy distribution of the two lithium batteries are even.

Background technique

The evolution of batteries, from traditional lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries to the most commonly used lithium-ion batteries (hereinafter referred to as lithium batteries) with the best effects in all parties, because lithium ions in lithium batteries have high energy Electrical activity, so charging can be completed in a short time. In addition to better charging efficiency, it also has the advantages of small size and large capacity; however, lithium batteries are not without disadvantages, because lithium ions in lithium batteries have high energy Electrical activity, so the packaging material and composition technology of the device shell are also particularly particular. In addition, special attention must be paid to the temperature rise effect during charging and to avoid damage to the lithium battery caused by excessive discharge. Due to the above characteristics, the lithium battery The maximum capacity of the lithium battery is limited. As far as the current manufacturing technology is concerned, it can only produce a lithium battery with a maximum of 20-30 Ah (Ah). The use of large power (such as electric locomotives or electric vehicles) cannot meet its needs. However, to increase the overall loading capacity and energy output of the battery, as far as the electrical principle is concerned, it can be achieved by connecting several lithium batteries in series. , but after several lithium batteries are connected in series, because the unit price of each lithium battery is high, and individual performance is different, after charging and discharging for many times, individual lithium batteries will have different attenuation or aging problems, causing each The charging and discharging performance of a lithium battery will have a great difference. When several lithium batteries are connected in series, when any lithium battery reaches its set high voltage protection point when charging, the charging system will order its protection circuit to It stops charging, so that the overall series-connected lithium battery cannot continue to charge and reaches the best saturation state, resulting in a decrease in its capacity. On the contrary, when the series-connected lithium battery is discharged, the lithium battery with a lower capacity in the lithium battery will reach the low voltage earlier. The critical point is cut off by the protection circuit to stop discharging, so the power of the lithium battery connected in series is cut off early, and its usable capacity is reduced.

Utility model content

The main purpose of the present utility model is to provide an energy equalization device applied to series connection of large-capacity lithium battery packs, wherein the lithium batteries can form a large-capacity lithium battery pack for use by connecting several lithium batteries in series, and can be used in series connection The energy balance device connected between the two lithium batteries can balance the power of each lithium battery and achieve the performance of uniform energy distribution, so that the electrical characteristics of each lithium battery can be kept the same regardless of charging or discharging. , with better performance.

The secondary purpose of the present utility model is to provide an energy equalization device applied to series connection of large-capacity lithium battery packs. When a plurality of lithium batteries are connected in series, the overall voltage stability and power output can be effectively improved, which can drive electric vehicles or electric vehicles. Such as high-power equipment, so that the amount can be used more efficiently, and the objects used are more diverse.

Another object of the present utility model is to provide an energy equalization device applied to a large-capacity lithium battery pack in series, wherein a protection circuit is connected next to the energy equalization device, so that the protection circuit can protect the lithium battery from abnormal voltage during charging and discharging. Or give a warning when the warning temperature is exceeded, and at the same time notify the connected charging or discharging device to process, or even stop its work, to achieve the best protection effect.

Another purpose of the present utility model is to provide an energy equalization device applied to a large-capacity lithium battery pack in series, wherein the energy equalization device and the protection circuit do not need an external power supply, as long as there is a voltage difference between the lithium batteries , and it will operate when there is an abnormal phenomenon, so it can play a role regardless of charging, discharging or when the device is standing still, and has full-time use performance.

An energy equalizing device applied to a large-capacity lithium battery pack in series, which is mainly provided with an energy equalizing device between two lithium batteries connected in series, and the energy equalizing device can obtain the voltage of the two lithium batteries and compare their levels, when When it is detected that there is a voltage difference between the two lithium batteries, it will pass through the energy equalization device synchronously to transfer the power of the lithium battery with the higher voltage to the lower voltage, so that the power of the two lithium batteries is balanced and the energy is uniform. the state of the distribution.

Description of drawings

Fig. 1 is a schematic block diagram of the utility model.

Fig. 2 is a circuit connection block diagram of a preferred embodiment of the present invention.

Fig. 3 is a schematic diagram of connection and function of the energy equalization device of the present invention. Description of figure number

A, B, C: Lithium battery 111: Energy balance device

11: Control unit 12: First distributor

13: Second distributor 2, 2a: Protection circuit

3, 3a: Input and output ports 4: Charging equipment

5: Discharging equipment SL: Warning signal

Detailed ways

Please refer to Fig. 1 first, the utility model is an energy equalization device applied to a large-capacity lithium battery pack in series, which is mainly provided with an energy equalization device 1 between two lithium batteries A and B connected in series, and the energy The equalizing device 1 can obtain the voltages of the two lithium batteries A and B and compare their levels. When detecting that there is a difference in the voltage level of the two lithium batteries A and B, it will pass through the energy equalizing device 1 synchronously to compare the voltages. The power of the lithium battery (A or B) of the higher one is sent to the lithium battery (B or A) with a lower voltage, so that the power of the two lithium batteries (A, B) is balanced and the energy is evenly distributed; and, the A protection circuit 2 is connected next to the energy balance device 1, so that the protection circuit 2 can detect the voltage level and temperature change of the lithium battery A and B, and when the voltage level of the lithium battery (A or B) is found to be charged or discharged Abnormal (such as too high or too low) or exceeding the warning temperature, the protection circuit 2 can send out a warning signal SL, and at the same time notify the connected charging device 4 or discharging device 5 through the input and output port 3 to deal with it, or even stop it. Work, and then protect the lithium batteries A, B and the charging and discharging equipment 4, 5 connected thereto.

Please refer to Fig. 2, which is a circuit connection block diagram of a preferred embodiment of the present utility model. The utility model can provide a plurality of lithium batteries connected in series according to requirements. In this illustration, three lithium batteries A, B, C is described as an example, it can be seen that an energy balance device 1, 1a is connected between two lithium batteries A, B and or B, C connected in series, and the energy balance device 1, 1a can detect the two batteries A, B or The voltage level difference between B and C is compared at the same time through the energy balance device and sent to the same level according to the voltage level, so that the electric power among lithium batteries A, B, and C is balanced, and the energy is evenly distributed; and, Wherein the energy balance device 1, 1a is connected with a protection circuit 2, 2a, so that the protection circuit 2, 2a can detect the voltage level and temperature change of the lithium batteries A, B, C, when any lithium battery A is found , B or C when charging and discharging, the voltage level is abnormal (such as too high or too low) or exceeds the warning temperature, the protection circuit 2, 2a can issue a warning signal, and at the same time notify the The connected charging or discharging equipment 4,5 is processed, and even its work is stopped, and then the lithium batteries A, B, C and the charging and discharging equipment 4,5 connected thereto are protected.

Please refer to FIG. 3 for a schematic diagram of the connection and function of the energy equalization device of the present invention, wherein the energy equalization device 1 is composed of a control unit 11 and first and second distribution circuits 12, 13, and the control unit 11 and the two Lithium batteries A and B are connected in parallel, and the voltage levels of the two lithium batteries A and B are obtained through detection, and after comparison by their internal circuits, the control unit 11 sends a signal to select and activate the first or second distributor 12 or 13 conduction; the first and second distributors 12 or 13 are connected in parallel with the lithium batteries A and B respectively, and have the characteristics of mutual exclusion and linkage; for example, when the control unit 11 compares the two lithium batteries There is a difference between the high and low voltage levels of A and B, and a signal will be output to notify the first (or second) distributor 12 or 13 to activate conduction, and make the second or first distributor 13 or 12, since the first or second distributor 12 or 13 is connected in parallel with lithium batteries A and B, the lithium battery A or B with higher voltage will pass through the first or second distributor 12 or 13 The power is sent to the lithium battery B or A with a lower voltage to achieve a state of balanced power distribution and energy distribution.

Claims (4)

1, a kind of balancing energy device of the high-capacity lithium battery group that is applied to connect, it is characterized in that: mainly between two lithium batteries of series connection, be provided with a balancing energy device, and this balancing energy device can be obtained the voltage of two lithium batteries and compare its accurate position, when the voltage that detects two lithium batteries has vertical parallax, promptly synchronously by this balancing energy device, carry toward voltage the electric weight of the lithium battery of voltage the higher person lower, make the electric weight equilibrium of two lithium batteries, and reach the state that energy even distributes.

2, the balancing energy device of the high-capacity lithium battery group that is applied to connect as claimed in claim 1, it is characterized in that: this lithium battery can be adopted most lithium batteries and connect in regular turn, to form a jumbo lithium battery group, and be arranged with the balancing energy device between two lithium batteries of this series connection, whereby with electric weight equilibrium that reaches this lithium battery and the state that energy even distributes.

3, the balancing energy device of the high-capacity lithium battery group that is applied to connect as claimed in claim 1 or 2, it is characterized in that: this balancing energy device, comprise by control unit and first, second distributor circuit and formed, and this control unit is in parallel with two lithium batteries, and by obtain the voltage quasi position of two lithium batteries with detecting, through its internal circuit relatively after, send signal by control unit and select and activate the first or second distributor conducting; This first, second distributor is in parallel with this lithium battery respectively and continues, therebetween and the characteristic of tool mutual exclusion interlock; For example when this control unit when the voltage quasi position tool of two lithium batteries relatively has high low level difference, promptly can export a signalisation first or second distributor and activate conducting, and second or first distributor is ended, because this is first or second in parallel with lithium battery, the higher lithium battery of this voltage promptly can be carried electric weight toward the low lithium battery of voltage through this first or second distributor whereby, and reaches the state of electric weight equiblibrium mass distribution and energy even distribution.

4, the balancing energy device of the high-capacity lithium battery group that is applied to connect as claimed in claim 1 or 2; it is characterized in that: the other protective circuit that connects of this balancing energy device; make this protective circuit be detected the voltage quasi position and the variations in temperature of lithium battery; the height of voltage is unusual or surpass the warning temperature when finding that lithium battery is in charge and discharge; this protective circuit signal that all can give a warning; notify the charge or discharge equipment of this connection to handle simultaneously; even by its work, and then the charge and discharge equipment of protecting lithium battery to be connected with it.

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