CN2867684Y - Secondary battery protection device capable of maintaining power supply - Google Patents

Abstract

A secondary battery protection device capable of maintaining power supply mainly comprises a main battery, two power output lines, a low voltage cut-off device and an auxiliary battery; the main battery and the auxiliary battery are in a circuit form of parallel power supply through two power output lines, and a low-voltage cut-off device is particularly arranged between the main battery and one of the power output lines; therefore, when the voltage value of the output end of the main battery is lower than the cut-off actuating voltage of the low voltage cut-off device, the main battery can be cut off from the power output line by the low voltage cut-off device to stop supplying power, and the auxiliary battery can still maintain power output to the two power output lines and the load.

Description

Secondary battery protection device capable of maintaining power supply

technical field

The utility model is a secondary battery protection device capable of maintaining power supply, in particular, an auxiliary battery is added to a circuit with a main battery, and low-voltage cut-off protection is only performed on the main battery, while the auxiliary battery is A circuit device that remains powered at all times.

Background technique

Secondary batteries are currently widely used in various products due to their rechargeable characteristics. However, secondary batteries are expensive and have discharge limitations, which are their disadvantages; when secondary batteries are used in traditional cars or For electric vehicles, the discharge operation range of the battery is relatively wide. If there is continuous high-current discharge or deep discharge in use, it will cause serious damage to the service life of the battery; for example: if a lithium battery is used as a secondary battery for vehicles At this time, due to the high cost of lithium batteries, battery damage will cause great economic losses to users;

Therefore, Japan's Sanyo Electric promptly proposed the application No. 83106489 patent case, which carries out voltage detection and comparison for the terminal voltage of the battery. Power-off processing to protect secondary batteries such as expensive lithium batteries from damage;

It is worth noting that if the secondary battery is used in a vehicle, there are usually many electronic systems in today's vehicles. When the power supply of the battery is completely cut off, the electronic system of the vehicle will also be completely inoperable. For example: the fault self-detection of the car system, vehicle activation ignition system, in-vehicle telephone system, warning lights, power windows, GPS, etc. are all completely inoperable; and usually in the event of a vehicle failure, the aforementioned electronic systems are necessary to maintain their operation;

Therefore, the inventor tried his best to think that if the main battery can still provide another maintenance power when the main battery is cut off for protection due to abnormal conditions, so that the electronic system in the car can still maintain operation, the aforementioned problems will definitely be solved.

Utility model content

The main purpose of this utility model is to provide a secondary battery protection device that can maintain power supply. Through the technology provided by this utility model, when the vehicle load is abnormal or the battery is over-powered (deep discharge), the main battery will When the terminal voltage of the main battery decreases and the terminal voltage of the main battery drops to the cut-off voltage, the low-voltage cut-off device will be activated to cut off the power supply connection between the main battery and the power output line; thereby, the main battery can be prevented from being continuously deeply discharged. The irreversible damage is caused, and the high-cost main battery is preserved, while the electronic equipment and other loads in the car can continue to be powered by the low-cost auxiliary battery.

In order to achieve the purpose of the above-mentioned utility model, the adopted technical solution is as follows: a secondary battery protection device capable of maintaining power supply, which mainly includes: a main battery, which can supply power to loads, as the main power supply source; two power output lines , is electrically connected with the main battery output terminal, so that the main battery can output power from the two power output lines; a low voltage cut-off device, the two terminals are respectively electrically connected with a power output line and the main battery, and the low voltage cut-off The device and the main battery are in the form of a series circuit; the two output terminals of an auxiliary battery are electrically connected to the two power output lines, so that the main battery and the auxiliary battery can be connected in parallel to supply power through the two power output lines; Therefore, when the voltage at the output terminal of the main battery is lower than the cut-off operating voltage of the low-voltage cut-off device, the main battery can be cut off by the low-voltage cut-off device to stop supplying power, while the auxiliary battery can still maintain power output to the second power output line and the load .

The main battery may consist of a lithium secondary battery, and the auxiliary battery may consist of a lead-acid battery.

The low-voltage cut-off device can be formed by integrating diodes.

The beneficial effects of the utility model are: the utility model provides a secondary battery protection device capable of maintaining power supply, through the technology provided by the utility model, when the vehicle load is abnormal or the battery is over-powered (deep discharge), and As a result, the terminal voltage of the main battery decreases, and when the terminal voltage of the main battery drops to the cut-off voltage, the low-voltage cut-off device will be activated to cut off the power supply connection between the main battery and the power output line; therefore, it can prevent the main battery from being continuously damaged The irreversible damage caused by discharge saves the high-cost main battery, while the electronic equipment and other loads in the car can achieve the effect of continuous power supply through the low-cost auxiliary battery.

Description of drawings

Fig. 1 is a schematic diagram of a battery power supply circuit of the present invention.

Fig. 2 is a schematic diagram of the low-voltage cut-off device of the present utility model actuating to cut off the main battery power supply state.

Explanation of main component symbols

10 main battery 201 and 202 power output lines

30 low voltage cut-off device 40 auxiliary battery

50 load

Detailed ways

Regarding the technology, means and effects adopted by the utility model to achieve the above-mentioned purpose, a preferred feasible embodiment is described in detail in conjunction with the drawings as follows; first of all, please refer to Fig. 1 and Fig. 2, the utility model The secondary battery protection device that can maintain power supply provided by the embodiment is mainly composed of a main battery 10, two power output lines 20, a low voltage cut-off device 30 and an auxiliary battery 40; wherein:

The main battery 10 is used as the main power supply source for supplying power to the load 50; it can be made of a secondary battery with a higher power capacity, for example, it can be made of a lithium battery with a higher cost;

The two power output lines 201 and 202 are respectively electrically connected to the output end of the main battery 10 and the load 50, so that the main battery 10 can output power to the load 50 from the two power output lines 201 and 202;

The low voltage cut-off device 30, its two ends are respectively electrically connected with a power output line 201 and the main battery 10, and the low voltage cut-off device 30 and the main battery 10 are connected in series; the low voltage cut-off device The cut-off voltage of 30 can be selected according to the actual demand of the main battery 10; in practice, the low-voltage cut-off device 30 can be formed by integrating a diode, for example: if the working voltage of the diode is more than twelve volts, and the cut-off voltage is nine volts Below, it is suitable for the use of the main battery 10 system with a terminal voltage of twelve volts;

The auxiliary battery 40 can be made of a relatively cheap small-capacity secondary battery, for example, can be made of a lead-acid battery with a lower cost; the two output terminals of the auxiliary battery 40 are electrically connected to the two power output lines 201 and 202 respectively , and make the main battery 10 and the auxiliary battery 40 be in parallel power supply circuit type, therefore, when the main battery 10 is protected by the low voltage cut-off device 30 to cut off the power supply to the two power output lines 201 and 202 for some reason, the auxiliary battery 40 is still Can maintain power output to two power output lines 201 and 202;

The above is the connection relationship position of each main component and circuit of the present utility model, hereby its use state is described in detail as follows:

Please refer back to Fig. 1 and shown in Fig. 2, if the technology provided by the utility model is applied to a vehicle with a power demand of twelve volts, then the main battery 10 and the auxiliary battery 40 can be selected as batteries with an output voltage of twelve volts ; and this low-voltage cut-off device 30 can select the operating voltage to be more than twelve volts, and the cut-off operating voltage is lower than nine volts, that is, when the main battery 10 terminal voltage is twelve volts, the low-voltage cut-off device 30 can operate normally , when the terminal voltage of the main battery 10 is lower than nine volts, the low voltage stopper 30 is cut off to cut off the power supply connection between the main battery 10 and the two power output lines 201 and 202;

In this way, when the vehicle load 50 has abnormal conditions or excessive power supply (deep discharge), which causes the terminal voltage of the main battery 10 to drop, and when the terminal voltage of the main battery 10 drops to the cut-off voltage of nine volts, the low voltage cut-off device 30 will be prompted to operate. to cut off the power supply connection between the main battery 10 and the two power output lines 201 and 202; at this time, the auxiliary battery 40 can still maintain the power supply output to the two power output lines 201 and 202, and the electronic system in the vehicle and other loads 50 It is necessary to operate normally through the power of the auxiliary battery 40;

There may be many reasons why the terminal voltage value of the main battery 10 drops abnormally to the cut-off voltage. After the cut-off protection of the low-voltage cut-off device 30, the main battery 10 can be prevented from being continuously deeply discharged to cause irreversible battery damage, and the manufacturing cost can be saved. The higher main battery 10; the auxiliary battery 40 in this case, the low-voltage cut-off device 30 is not set on purpose, so that the auxiliary battery 40 can still continue to supply power to the electronic equipment in the car.

Claims (3)

1. apparatus for protection of secondary battery that can maintain power supply is characterized in that it mainly comprises:

One main battery can be powered and be given load, as main supply of electric power source;

Two electric power output lines are done electrically to connect with the main battery output, make the main battery can be from two electric power output line output powers;

One low-voltage is by device, and two ends electrically connect with an electric power output line and main battery respectively, and makes low-voltage end device and main battery is the series circuit kenel;

One boosting battery, its two output are done electrically to connect with two electric power output lines respectively, make main battery and boosting battery can be the circuit kenel of parallel operation by two electric power output lines; By this, in the main battery output end voltage be lower than low-voltage by device when the start voltage, main battery can be cut off by device by low-voltage and stop power supply, boosting battery then still can be kept electric power and export two electric power output line and loads to.

2. the apparatus for protection of secondary battery that maintains power supply according to claim 1 is characterized in that: main battery can be made of lithium secondary battery, and boosting battery then is made of lead-acid battery.

3. the apparatus for protection of secondary battery that maintains power supply according to claim 1 is characterized in that: low-voltage can constitute by the long-pending diode of receiving by device.

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