TW201306433A - Balance protection device for battery module connected in parallel - Google Patents

Abstract

A balance protection device for battery module connected in parallel, comprises a current-limiting resistor electrically connected to conductive wires for balancing battery module voltage, and an indication element connected across the current-limiting resistor used to indicate the voltage difference; a switching element connected in parallel with the two ends of the current-limiting resistor and used for controlling the conduct of battery module connected in parallel when the voltage of the battery module is balanced; and a fuse is mounted on the electrical connection lead for protecting the battery module when the transient excess current generated between battery modules. The safety problem of two sets of battery module with different voltages connected in parallel can be solved through a simple element to efficiently accomplish the balance protection of the battery modules connected in parallel.

Description

Battery module parallel balance protection device

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-role detection and protection, and to make more than one battery module in parallel and voltage balance work. .

In an era when information and speed are becoming more and more important, computers and networks have become indispensable products for everyday life and the economic industry. However, important electronic devices, such as computers or networks, are often urgent and sensitive. Even a one-second power interruption can interrupt the processing or transmission of data, resulting in unpredictable losses, so a high Reliable power requirements have emerged. In response to this demand, the demand for continuous power supply systems and external battery power supplies has increased dramatically.

However, as the load device evolves, the specification difference becomes larger and larger. When the load needs to be expanded, the original power capability may be insufficient, or the power system is designed to be modular as the reliability requirements become higher and higher. The need for parallel and redundant is also an inevitable trend.

In addition to the need to increase the module 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 has When the replacement or expansion occurs, how to prevent the battery module from being damaged due to excessive transient overcurrent, or the technology or product design derived from dangerous overheating due to overcurrent. It is a key system technology for future battery systems and power systems with scalability and safety.

In particular, in the operation of charging the original battery and the battery to be connected in parallel and then performing 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 cost of the device is high, and the user There are also doubts about misuse or carelessness that cause danger.

This is because two sets of battery modules of different voltages usually generate transient overcurrent when connected in parallel. If the connection devices of two sets of battery modules with different voltages 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 mode still cannot effectively solve the problem that two sets of battery modules of different voltages are connected in parallel, and thus the reliability of the parallel system cannot be ensured. Therefore, when the battery system is required to continuously extend the battery capacity, the power supply mode The parallel approach of the group is clearly subject to further review and a viable solution.

Therefore, in order to solve the above disadvantages, the object of the present invention is to provide a battery module parallel balance protection device, which achieves balanced protection of two different voltage battery modules 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 simple detecting elements and switches, to ensure the reliability of the parallel system, and to be 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 purpose, the present invention discloses a battery module parallel balance protection device, 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. Protecting the first battery module and the second battery module in a balanced manner, wherein the balance protection device includes: a current limiting resistor located on the electrical connecting wire for conducting and balancing the first battery module and the second battery module a voltage, and an indicating component is connected across the current limiting resistor to indicate a voltage difference between the first battery module and the second battery module; a switching element is connected in parallel across the current limiting resistor, the first battery When the voltage of the module is balanced with the second battery module, the parallel connection between the first battery module and the second battery module is controlled; and a fuse is located on the electrical connecting wire for protecting the first battery When the instantaneous overcurrent generated between the module and the second battery module is turned off, 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, a light emitting diode or two anti-parallel light emitting diodes, and can be used to display any component or device used in the current process.

The balance protection device further includes a second switching 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 is further disposed at an electrical connection between the positive electrode or the negative electrode in the first battery module or the second battery module.

The invention has the advantages that the components required for the parallel protection device of the battery module are simple, and the design is externally connected to the electrical connection between the battery modules, or modularly designed in the battery module. The electrode output is designed to withstand the component specifications according to the voltage of the battery module, and the balance protection when the battery modules are connected in parallel is efficiently achieved, and the two sets of battery modules of different voltages are not connected in parallel. Because transient overcurrent causes safety problems. In particular, in the case of a battery system that is required to extend the battery capacity, for example, in the case of an existing uninterruptible power system (UPS) device plus a battery module.

The detailed description of the present invention and the technical description of the present invention are further illustrated by the embodiments, but it should be understood that these embodiments are for illustrative purposes only and are not to be construed as limiting.

Please refer to FIG. 1 , which is a schematic diagram of a circuit of the present invention. The invention discloses a battery module parallel balance protection device 100, 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 (instructions The electrical connection wire 310 of the positive electrode is used as 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. Give the load. 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 and balancing the voltages of the first battery module 200 and the second battery module 300, and an indicating component 120 is connected thereto. The current limiting resistor 110 is used to indicate the voltage difference between the first battery module 200 and the second battery module 300; a switching element 130 is connected in parallel across the current limiting resistor 110, and the first battery module 200 and the first When the voltage of the battery module 300 is balanced, the parallel connection between the first battery module 200 and the second battery module 300 is controlled; and a fuse 140 is located on the electrical connection wire 310 for protecting the first When the instantaneous overcurrent generated between the battery module 200 and the second battery module 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. The anti-parallel LED group 124 (shown in Figure 5) can employ any of the elements or devices known for use in displaying current.

The switching element 130 is implemented as a rod or metal plate that can be used in a closed loop, 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 electrical connection wires of the positive electrode and the negative electrode of the first battery module 200 and the second battery module 300 are connected in parallel. Current will pass through 310 and 320. During this operation, due to the presence of the current limiting resistor 110, the indicating component 120 should exhibit 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 digit, or by a light emitting diode. The light of the body 123 is known to have a current flowing from the second battery module 300 to the first battery module 200. Or further, the two reverse parallel LED groups 124 display current flow between the first battery module 200 and the second battery module 300, thereby being between the first battery module 200 and the second battery module 300. When the voltages are different, it is clear that the current is flowing from one battery pack to the other.

When the voltages of the two battery modules are very similar, that is, when the voltage between the first battery module 200 and the second battery module 300 is balanced, the display values of the voltage meter 121 and the current meter 122 are extremely small, or The light-emitting diode 123 or the two anti-parallel light-emitting diode groups 124 will no longer illuminate. At this time, the switching element 130 can be turned on and off for mounting the parallel-applied extended battery pack-second battery module 300.

In practice, it may be that after the second and subsequent installations, the switching element 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 re-opening the switching element 130 can solve 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 , the balance protection device 100 further includes a second switching component 150 at one end of the current limiting resistor 110 for controlling the first parallel connection between the first battery module 200 and the second battery module 300. Conduct balance to achieve the purpose of another safety control. And the second switching element 150 is the same as the switching element 130, and can be implemented as a rod or a metal plate that can be used in the closing ring. Any known switch structure and method can be used, that is, any type can be cut off and connected or contacted. The switch structure is most suitable.

Referring to FIG. 7 , the balance protection device 100 can be further disposed in the battery module. The balance protection device 100 can be placed inside any battery module to prevent any possible occurrence of battery parallel connection. Unsafe overcurrent condition. For example, the first battery module 200 is a power source of the original power supply, and the second battery module 300 can be installed at the electrode outlet to install the balance protection device 100. Any user needs to expand the battery capacity. When the second battery module 300 is required to be connected in parallel, the safety can be increased according to the previous operation mode and any chance of overcurrent is avoided.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

100. . . Balance protection device

110. . . Current limiting resistor

120. . . Indicator component

121. . . Voltage meter

122. . . Current meter

123. . . Light-emitting diode

124. . . Light-emitting diode group

130. . . Switching element

140. . . fuse

150. . . Second switching element

200. . . First battery module

300. . . Second battery module

310, 320. . . Electrical connection wire

Figure 1 is a schematic diagram of the circuit of the present invention.

2 is a first schematic diagram 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.

4 is a third schematic diagram 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.

100. . . Balance protection device

110. . . Current limiting resistor

120. . . Indicator component

130. . . Switching element

140. . . fuse

200. . . First battery module

300. . . Second battery module

310, 320. . . Electrical connection wire

Claims (8)

A battery module parallel balance protection device 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 and protecting the first battery module And the second battery module, wherein the balance protection device comprises: a current limiting resistor located 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 switching element connected in parallel across the current limiting resistor, in the first battery module and the first When the voltage of the two battery modules is balanced, the parallel connection between the first battery module and the second battery module is controlled; and a fuse is located on the electrical connecting wire for protecting the first battery module When a transient overcurrent occurs between the second battery module and the second battery module, the electrical connection between the first battery module and the second battery module is cut off. The balance protection device of claim 1, wherein the indicator element is a voltage meter. The balance protection device of claim 1, wherein the indicator element is a current meter. The balance protection device of claim 1, wherein the indicator element is a light-emitting diode. The balance protection device of claim 1, wherein the indicator element is composed of two anti-parallel light-emitting diodes. The balance protection device of claim 1, wherein a second switching element is further disposed at one end of the current limiting resistor for controlling conduction balance between the first battery module and the second battery module. The balance protection device of claim 1, wherein the balance protection device is further disposed at an electrical connection between the positive electrode and the negative electrode in the first battery module. The balance protection device of claim 1, wherein the balance protection device is further disposed at an electrical connection between the positive electrode and the negative electrode of the second battery module.