WO2013010319A1

WO2013010319A1 - Balance protection device for battery modules in parallel connection

Info

Publication number: WO2013010319A1
Application number: PCT/CN2011/077323
Authority: WO
Inventors: 张惇育; 张惇杰
Original assignee: 长园科技实业股份有限公司
Priority date: 2011-07-19
Filing date: 2011-07-19
Publication date: 2013-01-24

Abstract

A balance protection device for battery modules in parallel connection, comprising a current limiting resistor located on an electrically connected conducting wire and used for conducting and balancing the voltages of the battery modules; an indicating assembly bridged over the current limiting resistor and used for indicating voltage difference; a switch assembly connected in parallel with the two ends of the current limiting resistor and used for controlling the parallel conduction of the battery modules when the voltages of the battery modules are balanced; and a fuse located on the electrically connected conducting wire and used for protecting against instantaneous over current generated between the battery modules. The present invention efficiently achieves the balance protection of the battery modules in parallel connection via a simple assembly, and solves the safety problem caused when two battery modules with different voltages are connected in parallel.

Description

Balance protection device for battery modules in parallel

Technical field

The invention relates to a battery module parallel balance protection device, in particular to a balance protection device for all battery modules to have complete and independent self-character detection and protection, and to make more than one battery module connected in parallel and voltage balanced.

Background technique

In an age when information and speed are becoming more and more important, computers and networks have become indispensable products for everyday life and the economy. However, important electronic devices, whether computers or networks, are often urgent and sensitive. Even a one-second power outage can interrupt the processing or transmission of data, resulting in unpredictable losses, so a high reliability. The demand for power has come into being. In response to this demand, the demand for continuous power supply and external battery power supply has increased dramatically.

However, as the load device evolves, the specification difference becomes larger and larger. When the load needs to be augmented, the original power capability may be insufficient, or as the reliability requirements become higher, the power system is designed to be modular, with Parallel and redundant requirements are also inevitable trends.

In addition to the need to add modules to expand the capacity, on the other hand, when some of the battery components are damaged, they must be able to be replaced immediately to ensure the reliability of the system. Under the above requirements, when the battery is replaced When the expansion occurs, how to prevent the battery module from being damaged due to excessive transient overcurrent, or the dangerous overheating due to overcurrent, is the future of technology or product design. Whether the battery system and the power system have the key technologies of the system that are scalable and safe.

In particular, in the case of separately charging the original battery and the battery to be connected in parallel and then performing the parallel connection, the disadvantage of the prior art method is that the processing method is rather cumbersome, and an additional charger is required, so that the equipment cost is high, and the operation is high. There are also misconceptions that are misused or careless and cause danger.

This is because two sets of battery modules of different voltages usually generate transient overcurrent when connected in parallel. If two sets of battery modules with different voltages in parallel cannot provide a safe design, instantaneous overcurrent will cause safety problems. Moreover, the low voltage battery module will be quickly charged and may reduce the number of times the battery module is charged during the remaining years of use.

It can be seen from the above that the parallel connection method can not effectively solve the problem when two sets of battery modules of different voltages are connected in parallel, and thus the reliability of the parallel system cannot be ensured, so that the battery capacity is required to be extended according to the uninterrupted power requirement. When the battery system is in use, the parallel connection of the power modules is clearly pending further review and a viable solution is sought.

Summary of the invention

Therefore, in order to solve the above disadvantages, an object of the present invention is to provide a balanced protection device for battery modules in parallel, which achieves balanced protection of battery modules of two different voltages through simple detection components and switches.

Another object of the present invention is to achieve balanced protection of battery modules of two different voltages in a low-cost state through a simple detection component and a switch, thereby ensuring the reliability of the parallel system, and is suitable for expanding the capacity of the battery. This process can be used to increase safety and avoid any chance of overcurrent when the battery is connected in parallel.

In order to achieve the above object, the present invention discloses a balance protection device for parallel connection of a battery module, which is installed on an electrical connection wire of a positive electrode or a negative electrode connected in parallel between a first battery module and a second battery module for balance protection. The first battery module and the second battery module, wherein the balance protection device comprises: a current limiting resistor on the electrical connecting wire for conducting a voltage for balancing the first battery module and the second battery module, and an indicating component Connected to the current limiting resistor to indicate a voltage difference between the first battery module and the second battery module; a switch component is connected in parallel across the current limiting resistor, and voltages of the first battery module and the second battery module During balancing, the parallel conduction of the first battery module and the second battery module is controlled; and a fuse is located on the electrical connecting wire for protecting an instant generated between the first battery module and the second battery module When the current is current, the electrical connection between the first battery module and the second battery module is cut off.

Wherein, the indicating component is a voltage meter, a current meter, an LED or a combination of two anti-parallel LEDs, which can be used to display any component or device used in the current process.

The balance protection device further includes a second switch component at one end of the current limiting resistor for controlling the conduction balance of the first battery module and the second battery module.

Further, the balance protection device is further disposed at an electrical connection between the positive electrode or the negative electrode of the first battery module or the second battery module.

The invention has the advantages that the components required for the balance protection device of the battery module in parallel are simple, and are designed to be electrically connected to each other electrically connected between the battery modules, or modularly designed at the electrode output of the battery module. And in the design can be used according to the voltage of the battery module can withstand the group The specifications of the parts are effective to achieve the balance protection when the battery modules are connected in parallel. Solving the two sets of battery modules with different voltages does not cause safety problems due to transient overcurrent when connected in parallel. In particular, it is useful in the case of a battery system that requires extended battery capability, such as the addition of a battery module to an existing uninterruptible power system (UPS) device.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic circuit diagram of the present invention.

FIG. 2 is a schematic diagram 1 of a circuit according to an embodiment of the present invention.

FIG. 3 is a schematic diagram 2 of a circuit according to an embodiment of the present invention.

FIG. 4 is a schematic diagram 3 of a circuit according to an embodiment of the present invention.

FIG. 5 is a schematic diagram 4 of a circuit according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of another application according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of still another application of the embodiment of the present invention.

Symbol Description

100 balance protection device 110 current limiting resistor

120 indicator component 121 voltage gauge

122 Current Meter 123 Light Emitting Diode

124 LED Group 130 Switch Assembly

140 fuse 150 second switch assembly

200 first battery module 300 second battery module

310, 320: Electrical connection wire

DETAILED DESCRIPTION OF THE INVENTION The detailed description and the technical description of the present invention will be further described by the embodiments, but it should be understood that these embodiments are for illustrative purposes only and should not be construed as limit.

Please refer to FIG. 1 , which is a schematic circuit diagram of the present invention. The invention discloses a balance protection device 100 in parallel with a battery module, which is installed on an electrical connection wire 310 or 320 of a positive electrode or a negative electrode connected in parallel between a first battery module 200 and a second battery module 300. The electrical connection wire 310 is an embodiment) for balancing protection of the first battery module 200 and the second battery module 300. In the example, the first battery module 200 is used to supply power to a load (not shown), and can be connected in parallel with other battery modules (such as the second battery module 300) to charge each other or simultaneously to the load. And it should be noted that The implementation of this case is not limited to only two battery modules can be connected in parallel, and multiple battery modules can be connected in parallel at the same time.

The balancing protection device 100 includes: a current limiting resistor 110 on the electrical connecting wire 310 for conducting the voltages of the first battery module 200 and the second battery module 300, and an indicating component 120 spanning the limit The flow resistance 110 is used to indicate the voltage difference between the first battery module 200 and the second battery module 300. A switch component 130 is connected in parallel across the current limiting resistor 110, and the first battery module 200 and the second battery module 300 are The voltage balance is used to control the parallel connection between the first battery module 200 and the second battery module 300; and a fuse 140 is located on the electrical connection wire 310 for protecting the first battery module 200 and the second When the instantaneous overcurrent generated between the battery modules 300 exceeds the preset load of the fuse 140, the electrical connection between the first battery module 200 and the second battery module 300 is cut off.

The indicating component 120 can be a voltage meter 121 (shown in FIG. 2), a current meter 122 (shown in FIG. 3), a light emitting diode 123 (shown in FIG. 4), or two reversed. Parallel LED groups 124 (shown in Figure 5) can employ any of the components or devices known for use in displaying current.

The switch assembly 130 implements a rod or plate that can be used in a closed cycle, and any known switch structure and method can be employed, i.e., any type of switch structure that can be switched off and on or in contact is most suitable.

In practice, when the second battery module 300 is newly connected to the first battery module 200 for the first time, the first battery module 200 and the second battery module 300 are connected to the positive and negative electrical connection wires 310 and 320. There will be current through. During this operation, due to the presence of the current limiting resistor 110, the indicating component 120 should display a voltage difference, such as the voltage meter 121, the current meter 122 can display the voltage difference or current by a pointer or a digital, or by a light emitting diode. The light of 123 is known to have a current flowing from the second battery module 300 to the first battery module 200. Or further, the current flow direction between the first battery module 200 and the second battery module 300 is displayed by the two anti-parallel LED groups 124, whereby when the voltage between the first battery module 200 and the second battery module 300 is different, It is clear that current is flowing from one battery pack to another.

When the voltages of the two battery packs are very similar, that is, when the voltage between the first battery module 200 and the second battery module 300 reaches equilibrium, the display values of the voltage meter 121 and the current meter 122 may be extremely small, or may be illuminated. Diode 123 or two anti-parallel LED groups 124 will no longer illuminate State. At this time, the switch assembly 130 can be turned on and off to install the battery pack 300, which is extended and used in an extended manner.

In practice, it may be that after the second and subsequent installations, the switch assembly 130 may be forgotten to be turned on, and the fuse 140 located on the aforementioned electrical connecting wire 310 will be used to terminate the operation of the battery pack in parallel for protection. When a transient overcurrent occurs between the first battery module 200 and the second battery module 300, the electrical connection between the first battery module 200 and the second battery module 300 is cut off. In such a case, the user only needs to replace the fuse 140, and reopening the switch assembly 130 solves this problem. This device is necessary for safety considerations when connecting two battery packs that are potentially different in different voltages.

Referring to FIG. 6 again, the balance protection device 100 further defines a second switch component 150 at the end of the current limiting resistor 110 for controlling the actual conduction of the first battery module 200 and the second battery module 300. Balance, to achieve the purpose of another security control. And the second switch component 150 is the same as the switch component 130, and is implemented as a rod or a metal plate that can be used in a closed cycle. Any known switch structure and method can be used, that is, any type can be cut off and connected or The contact switch structure is most suitable.

Referring to FIG. 7 , the balance protection device 100 can be further implemented in the battery module. The balance protection device 100 can be placed inside any battery module to prevent any unsafeness that may occur during parallel connection of the battery. Over current condition. For example, the first battery module 200 is a power source of the original power supply, and the second battery module 300 of the external battery module can be installed at the electrode outlet to install the balance protection device 100. When any user wants to expand the battery capacity, that is, When the second battery module 300 is required to be connected in parallel, the safety can be increased and any chance of overcurrent can be avoided according to the previous operation mode.

The above is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, that is, the simple equivalent change and modification according to the scope of the present invention and the description of the invention should still be It is within the scope of the present invention.

Claims

Rights request

A balance protection device for parallel connection of a battery module, characterized in that it is installed on an electrical connection wire of a positive electrode or a negative electrode connected in parallel between a first battery module and a second battery module for balancing protection of the first a battery module and a second battery module, wherein the balance protection device comprises:

a current limiting resistor is disposed on the electrical connecting wire for conducting a voltage for balancing the first battery module and the second battery module, and an indicating component is connected across the current limiting resistor to indicate the first battery The voltage difference between the module and the second battery module;

a switch assembly, which is connected in parallel with the current limiting resistor, and controls parallel connection between the first battery module and the second battery module when the voltages of the first battery module and the second battery module are balanced; The fuse is located on the electrical connecting wire and is used to protect the electrical connection between the first battery module and the second battery module when the instantaneous overcurrent generated between the first battery module and the second battery module is protected.

2. A balance protection device according to claim 1 wherein the indicator assembly is a voltage gauge.

3. The balance protection device of claim 1 wherein the indicator assembly is a current meter.

The balance protection device according to claim 1, wherein the indicating component is a light emitting diode.

The balance protection device according to claim 1, wherein the indication component is composed of two anti-parallel light-emitting diodes.

The balance protection device according to claim 1, further comprising a second switch component at one end of the current limiting resistor for controlling the conduction balance of the first battery module and the second battery module.

The balance protection device according to claim 1, wherein the balance protection device is electrically connected to the positive electrode or the negative electrode of the first battery module.

The balance protection device according to claim 1, wherein the balance protection device is electrically connected to the positive electrode or the negative electrode of the second battery module.