AU2012200285B2 - Battery protection system and battery system thereof - Google Patents
Battery protection system and battery system thereof Download PDFInfo
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- AU2012200285B2 AU2012200285B2 AU2012200285A AU2012200285A AU2012200285B2 AU 2012200285 B2 AU2012200285 B2 AU 2012200285B2 AU 2012200285 A AU2012200285 A AU 2012200285A AU 2012200285 A AU2012200285 A AU 2012200285A AU 2012200285 B2 AU2012200285 B2 AU 2012200285B2
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- battery
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- electrode switch
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Abstract
A battery protection system and a battery system thereof are disclosed. The battery protection system is electrically connected to a first battery module via a battery loop for protecting the first battery module. A voltage monitoring circuit of the battery protection system is located in the battery loop for detecting a voltage signal. When the voltage monitoring circuit detects the voltage signal, a negative electrode switch element is controlled to be conductive. A current detection circuit is located in the battery loop for detecting a current signal. A comparator is used for determining whether the current detection circuit detects the current signal. When the current detection circuit detects the current signal, the comparator controls a positive electrode switch element to be conductive. If the voltage signal is over a voltage setting value, the voltage monitoring circuit controls the negative electrode switch element to cut off the battery loop. - - - - - - - - - - - - ~ I It a In
Description
1 PATENTS ACT 1990 Section 29 Standard Patent Applicants and Inventors: luan Jou YANG 1OF., No. 34, Sec. 2, Heping E. Rd Da-an District Taipei City 106 Taiwan R.O.C. AND Ming Tsung HSU 1OF., No. 34, Sec. 2, Heping E. Rd Da-an District Taipei City 106 Taiwan R.O.C. Title of Invention: BATTERY PROTECTION SYSTEM AND BATTERY SYSTEM THEREOF The applicant applies for the grant of a patent for the invention described in the accompanying complete patent specification: The following is a full description of the invention including the best method of performing the invention, known to us: descPA207512ama060ct15 2 BATTERY PROTECTION SYSTEM AND BATTERY SYSTEM THEREOF FIELD OF INVENTION [0001] The present invention relates to a battery protection system and a battery system thereof and, more particularly, relates to a battery protection system and a battery system thereof that perform controlling according to magnitude of charging voltage. BACKGROUND [0002] In technology development today, any mobile electronic apparatus, e.g. a laptop computer or mobile electronic devices like a mobile phone, includes a battery module. The battery module may use one or more rechargeable lithium batteries as power supply source. On the other hand, in order to increase battery power supply magnitude, it is also possible to connect different battery modules in parallel. [0003] First, please refer to Fig. 1, which illustrates a structure diagram of a conventional battery system in the prior art. [0004] The conventional battery system 90 of the prior art includes a battery module 91 and an unidirectional conductive element 92. The battery module 91 may supply power to a load (not shown in the drawing) or be connected to another battery system 90 in parallel. The unidirectional conductive element 92 is electrically connected with the descPA207512ama060ct15 3 battery module 91. The unidirectional conductive element 92 may be a diode or a switch module for protecting the battery module 91 to ensure current flow of the battery module 91 as unidirectional input. In the prior art, although the unidirectional conductive element 92 may guarantee the current flow direction of the battery module 91, however, if charging current has larger flow size, current that flows through the unidirectional conductive element 92 causes high temperature. Such high temperature may cause damage of the battery system 90 or the load that installs the battery system 90. On the other hand, when different battery systems 90 are connected in parallel, voltage difference among different battery systems 90 may be too large. That would also cause too large voltage and consequently damage the battery system 90. [0005] Therefore, there is a need to create a new battery protection system and its associated battery system to solve the problems of the prior art. SUMMARY OF INVENTION [0006] An objective of the present invention is to provide a battery protection system that performs controlling according to magnitude of charging voltage. Accordingly the invention provides in a first aspect, a battery protection system electrically connected to a first battery module via descPA207512ama060ct15 4 a battery loop for protecting the first battery module, the battery protection system comprising: a voltage monitoring circuit located in the battery loop for detecting whether there is a voltage signal; a negative electrode switch element located in the battery loop and electrically connected to the voltage monitoring circuit, the negative electrode switch element being controlled to be conductive when the voltage monitoring circuit detects the voltage signal; a current detection circuit located in the battery loop for detecting a current signal; a comparator electrically connected to the current detection circuit for determining whether the current detection circuit detects the current signal; and a positive electrode switch element located in the battery loop and electrically connected to the comparator, the comparator controlling the positive electrode switch element to be conductive when the current detection circuit detects the current signal, wherein the voltage monitoring circuit controls the negative electrode switch element to cut off the battery loop when the voltage signal is over a voltage setting value; wherein when the current detection circuit does not detect the current signal, the comparator controls the positive electrode switch element to be turned off. descPA207512ama06Oct15 5 [0007] Another objective of the present invention is to provide a battery system that has such battery protection system. Accordingly, the invention provides in another aspect, a battery system, comprising: a first battery module; and a battery protection system electrically connected to the first battery module via a battery loop for protecting the first battery module, the battery protection system comprising: a voltage monitoring circuit located in the battery loop for detecting whether there is a voltage signal; a negative electrode switch element located in the battery loop and electrically connected to the voltage monitoring circuit, the voltage monitoring circuit controlling the negative electrode switch element to be conductive when the voltage monitoring circuit detects the voltage signal; a current detection circuit located in the battery loop for detecting a current signal; a comparator electrically connected to the current detection circuit for determining whether the current detection circuit detects the current signal; and a positive electrode switch element located in the battery loop and electrically connected to the comparator, the comparator controlling the positive electrode switch element to be conductive when the current detection circuit detects the current signal, wherein the voltage descPA207512ama06Oct15 6 monitoring circuit controlling the negative electrode switch element to cut off the battery loop when the voltage signal is larger than a voltage setting value; wherein when the current detection circuit does not detect the current signal, the comparator controls the positive electrode switch element to be turned off. [0008] To achieve the above mentioned purposes, a battery protection system of the present invention is electrically connected to a first battery module via a battery loop to protect the first battery module. The battery protection system includes a voltage monitoring circuit, a negative electrode switch element, a current detection circuit, a comparator and a positive electrode switch element. The voltage monitoring circuit is located in the battery loop for detecting whether there is a voltage signal. The negative electrode switch element is located in the battery loop and electrically connected to the voltage monitoring circuit. When the voltage monitoring circuit detects the voltage signal, the negative electrode switch element is controlled to be conductive. The current detection circuit is located in the battery loop for detecting a current signal. The comparator is electrically connected to the current detection circuit for determining whether the detection circuit detects the current signal. The positive electrode switch element is located in the battery loop and electrically connected to the comparator. When the current detection circuit detects the current signal, the comparator controls the positive electrode switch descPA207512ama06Oct15 7 element to be conductive. In addition, if the voltage signal is over a voltage setting value, the voltage monitoring circuit controls the negative electrode switch element to cut off the battery loop. [0009] The battery system includes a first battery module and a battery protection system. The battery protection system is electrically connected to the first battery module via a battery loop to protect the first battery module. The battery protection system includes a voltage monitoring circuit, a negative electrode switch element, a current detection circuit, a comparator and a positive electrode switch element. The voltage monitoring circuit is located in the battery loop for detecting whether there is a voltage signal. The negative electrode switch element is located in the battery loop and electrically connected to the voltage monitoring circuit. When the voltage monitoring circuit detects the voltage signal, the negative electrode switch element is controlled to be conductive. The current detection circuit is located in the battery loop for detecting a current signal. The comparator is electrically connected to the current detection circuit to determine whether the current detection circuit detects a current signal. The positive electrode switch element is located in the battery and electrically connected to the comparator. When the current detection circuit detects the current signal, the comparator controls the positive electrode switch element to be conductive. In addition, if the voltage signal is over a voltage setting value, the voltage monitoring circuit descPA207512ama06Oct15 8 controls the negative electrode switch element to cut off the battery loop. [0010] With such novel structures, the present invention brings unexpected technical result and solves problems of conventional art. BRIEF DESCRIPTION OF DRAWINGS [0011] The present invention is illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar elements and in which: [0012] Fig. 1 is a structure diagram of a conventional battery system in the prior art; [0013] Fig. 2A is a structure diagram illustrating battery systems connected in parallel in one embodiment of the present invention; [0014] Fig. 2B is a structure diagram illustrating a battery protection system in one embodiment of the present invention; [0015] Fig. 3A is a current to time coordinate diagram illustrating discharging example for battery modules connected in parallel according to the present invention; [0016] Fig. 3B is a voltage to time coordinate diagram illustrating end of discharging example of battery modules connected in parallel according to the present invention; and [0017] Fig. 4 illustrates a battery system electrically connected to a charging device in one embodiment of the present invention. descPA207512ama06Oct15 9 PREFERRED EMBODIMENTS [0018] These and other objects and advantages of the present invention will become apparent from the following description of the accompanying drawings, which disclose several embodiments of the present invention. It is to be understood that the drawings are to be used for purposes of illustration only, and not as a definition of the invention. [0019] First, please refer to Fig. 2A and Fig. 2B, which are structure diagram illustrating a battery system and a battery protection system of the present invention. Specifically, Fig. 2A is a structure diagram illustrating battery systems being connected in parallel in one embodiment of the present invention. Fig. 2B is a structure diagram illustrating a battery protection system in one embodiment of the present invention. [0020] The battery system 1 supplies power to a load (not shown in the drawing) and may be connected to another battery system 2 in parallel for charging each other or simultaneously supplying power to the load. It is to be noted that the present invention is not limited to connect only two battery systems in parallel. More than two battery systems may also be connected in parallel according to different requirements. The battery system 1 includes a battery protection system 10 and a descPA207512ama06Oct15 10 first battery module 11, which are electrically connected via a battery loop C. The first battery module 11 may be a single lithium-ion battery unit or multiple lithium-ion battery units connected in series, but the present invention is not limited to such configurations. The first battery module 11 supplies a power to the load via the battery loop C or is connected in parallel to a second battery module 12 of the battery system 2 via the battery loop C. [0021] The battery protection system 10 is a hardware structure for protecting the first battery module 11. The battery protection system 10 includes a voltage monitoring circuit 21, a current detection circuit 22, a comparator 30, a reference circuit 211, a negative electrode switch element 41, and a positive electrode switch element 42, which are electrically connected to each other via the battery loop C. The following disclosure explains operation of each element in the battery protection system 10 with the embodiment in which the first battery module 11 and the second battery module 12 are connected in parallel. However, it is to be noted that the battery protection system 10 of the present invention is not limited to only function in the case with two battery modules connected in parallel. [0022] The voltage monitoring circuit 21 of the battery protection system 10 is located in the battery loop C and implemented by a simple hardware circuit, though the present invention is not limited to such descPA207512ama06Oct15 11 configuration. The voltage monitoring circuit 21 is used for detecting whether there is a voltage signal occurred on the battery loop C. [0023] The negative electrode switch element 41 is located in the battery loop C and electrically connected to the voltage monitoring circuit 21. The negative electrode switch element 41 may be a recoverable switch element, e.g. a MOS (metal-oxide-semiconductor) transistor, but the present invention is not limited to such configuration. When the first battery module 11 is connected in parallel with the second battery module 12 via the battery loop C, the voltage monitoring circuit 21 detects a voltage signal occurred on the battery loop C. Then the voltage monitoring circuit 21 controls the negative electrode switch element 41 to be conductive. [0024] The current detection circuit 22 is located in the battery loop C and implemented by a simple hardware circuit, but the present invention is not limited to such configuration. When the first battery module 11 and the second battery module 12 are connected in parallel, the current detection circuit 22 simultaneously detects a current signal on the battery loop C. [0025] The comparator 30 is implemented by a simple hardware circuit but the present invention is not limited to such configuration. The comparator 30 is electrically connected to the current detection circuit 22 for determining whether the current detection circuit 22 detects the descPA207512ama06Oct15 12 current signal on the battery loop C and further determines the size of the current signal. [0026] The positive electrode switch element 42 is located in the battery loop C and electrically connected to the comparator 30. Similar to the negative electrode switch element 41, the positive electrode switch element 42 may be a recoverable switch element, e.g. a MOS (metal oxide-semiconductor) transistor but the present invention is not limited to such configuration. When the current detection circuit 22 detects the current signal, the comparator controls the positive electrode switch element 42 to be conductive. With such design, the negative electrode switch element 41 and the positive electrode switch element 42 are turned conductive at the same time so that the loop between the first battery module 11 and the second battery module 12 is conductive and current signal can be transmitted normally. [0027] The battery protection system 10 further includes a reference circuit 211 and the reference circuit 211 is electrically connected with the voltage monitoring circuit 21. The reference circuit 211 is implemented by a simple hardware circuit and the voltage monitoring circuit 21 is set with a voltage setting value by the reference circuit 211. When the voltage monitoring circuit 21 detects the voltage signal, the voltage monitoring circuit 21 further compares magnitudes of the voltage signal with the voltage setting value. When the voltage signal descPA207512ama06Oct15 13 is larger than the voltage setting value, which may mean that the voltage difference between the first battery module 11 and the second battery module 12 is too high, keeping the loop conductive may cause a too high temperature of the loop and may thus damage the first battery module 11 or the second battery module 12. Therefore, when such case happens, the voltage monitoring circuit 21 turns off the negative electrode switch element 41 to cut off the battery loop C so that the current signal cannot be transmitted normally. Then, when the current detection circuit 22 does not detect the current signal, the comparator 30 controls the positive electrode switch element 42 to be turned off. As such, the current transmission on the battery loop C is cut off for protecting the first battery module 11. [0028] It is to be noted that the voltage monitoring circuit 21 is not limited to be set a voltage setting value with a hardware reference circuit 211. The voltage setting value may also be stored in modules like a database to be accessed by the voltage monitoring circuit 21, but the present invention is not limited to such configuration, either. [0029] Next, please refer to Fig. 3A and Fig. 3B at the same. Fig. 3A and Fig. 3B are characteristic diagrams measured in a real application with battery modules of the present invention. Fig. 3A illustrates a current to time coordinate diagram for discharging battery modules being connected in parallel of the present invention. Fig. 3B illustrates descPA207512ama06Oct15 14 a voltage to time coordinate diagram when discharging is finished for battery modules connected in parallel of the present invention. [0030] It is to be noted Fig. 3A and Fig. 3B are only examples illustrating the case when the first battery module 11 has 50% battery power and the second battery module 12 has 100% battery power but the present invention is not limited to such configuration. When the first battery module 11 and the second battery module 12 are connected in parallel and have voltage difference to each other, the second battery module 12 charges the first battery module 11 when they are not electrically connected to a load at preliminary stage. As illustrated in Fig. 3A in such case, the current of the second battery module 12 falls down and the current of the first battery module 11 arises gradually. When the load is connected for discharging, the second battery module 12 has a larger discharging current than the first battery module 11 because the second battery module 12 has a higher voltage. But, meanwhile, the voltage of the second battery module 12 drops faster, and consequently, the voltage of the second battery module 12 in the latter discharging stage is smaller than the voltage of the first battery module 11. Consequently, the discharging current value of the second battery module 12 decreases relatively while the discharging current value of the first battery module 11 increases relatively. descPA207512ama06Oct15 15 [0031] Finally, as illustrated in Fig. 3B, in the last stage of discharging, the voltage difference between the first battery module 11 and the second battery module 12 is not large. Thus, the discharging of the first battery module 11 is getting closer to that of the second battery module 12 gradually and then cut off equivalently. [0032] It is to be noted that the battery protection system 10 is not limited for protecting battery modules connected in parallel. Next, please refer to Fig. 4, which is a diagram illustrating electrical connection between a battery system and a charging device in one embodiment of the present invention. [0033] When the battery system 1 is electrically connected to a charging device 50, the charging device 50 is electrically connected to the battery module 11 via the battery loop C for charging the first battery module 11. While the charging device 50 performs charging, the battery protection system 10 detects the voltage on the battery loop C for protecting the first battery module 11. To simplify description and because operation of the battery protection system 10 has been explained in above implementation disclosure, it is not repeated here again. [0034] With the system as described above, no matter how large the current signal on the battery loop C is, the current signal does not flow descPA207512ama06Oct15 16 through the battery system 1. As such, the temperature does not rise continuously and thus, the first battery module 11 is protected. Meanwhile, the battery systems connected in parallel may charge to each other and equivalently discharge when a load is connected under such design. [0035] It is noted that the above-mentioned embodiments are only for illustration. It is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents. Therefore, it will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. [0036] Throughout the specification and claims the use of the term "comprise" and its derivatives is intended to have an inclusive rather than an exclusive meaning unless the context determines otherwise. descPA207512ama06Oct15
Claims (10)
1. A battery protection system electrically connected to a first battery module via a battery loop for protecting the first battery module, the battery protection system comprising: a voltage monitoring circuit located in the battery loop for detecting whether there is a voltage signal; a negative electrode switch element located in the battery loop and electrically connected to the voltage monitoring circuit, the negative electrode switch element being controlled to be conductive when the voltage monitoring circuit detects the voltage signal; a current detection circuit located in the battery loop for detecting a current signal; a comparator electrically connected to the current detection circuit for determining whether the current detection circuit detects the current signal; and a positive electrode switch element located in the battery loop and electrically connected to the comparator, the comparator controlling the positive electrode switch element to be conductive when the current detection circuit detects the current signal, wherein the voltage monitoring circuit controls the negative electrode switch element to cut off the battery loop when the voltage signal is over a voltage setting value; wherein when the current detection circuit claimsPA207512ama06Oct15 18 does not detect the current signal, the comparator controls the positive electrode switch element to be turned off.
2. The battery protection system as claimed in claim 1, further comprising a reference circuit, wherein the voltage monitoring circuit sets the voltage setting value by the reference circuit.
3. The battery protection system as claimed in claim 1, wherein the negative electrode switch element is a recoverable switch element.
4. The battery protection system as claimed in claim 1, wherein the positive electrode switch element is a recoverable switch element.
5. A battery system, comprising: a first battery module; and a battery protection system electrically connected to the first battery module via a battery loop for protecting the first battery module, the battery protection system comprising: a voltage monitoring circuit located in the battery loop for detecting whether there is a voltage signal; a negative electrode switch element located in the battery loop and electrically connected to the voltage monitoring circuit, the voltage monitoring circuit controlling the negative electrode switch element to be conductive when the voltage monitoring circuit detects the voltage signal; a current detection circuit located in the battery loop for detecting a current signal; claimsPA207512ama06Oct15 19 a comparator electrically connected to the current detection circuit for determining whether the current detection circuit detects the current signal; and a positive electrode switch element located in the battery loop and electrically connected to the comparator, the comparator controlling the positive electrode switch element to be conductive when the current detection circuit detects the current signal, wherein the voltage monitoring circuit controlling the negative electrode switch element to cut off the battery loop when the voltage signal is larger than a voltage setting value; wherein when the current detection circuit does not detect the current signal, the comparator controls the positive electrode switch element to be turned off.
6. The battery system as claimed in claim 5, wherein the battery protection system further comprises a reference circuit, and the comparator sets the voltage setting value with the reference circuit.
7. The battery system as claimed in claim 5, wherein the negative electrode switch element is a recoverable switch element.
8. The battery system as claimed in claim 5, wherein the positive electrode switch element is a recoverable switch element. claimsPA207512ama06Oct15 20
9. The battery system as claimed in claim 5, wherein the first battery module is connected to a second battery module in parallel via the battery loop.
10. The battery system as claimed in claim 5, wherein the first battery module is electrically connected to a charging device via the battery loop. claimsPA207512ama06Oct15
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100201318U TWM407536U (en) | 2011-01-20 | 2011-01-20 | Battery protection system and its battery system |
| TW100201318 | 2011-01-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2012200285A1 AU2012200285A1 (en) | 2012-08-09 |
| AU2012200285B2 true AU2012200285B2 (en) | 2015-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2012200285A Ceased AU2012200285B2 (en) | 2011-01-20 | 2012-01-18 | Battery protection system and battery system thereof |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU2012200285B2 (en) |
| TW (1) | TWM407536U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050275373A1 (en) * | 2004-06-09 | 2005-12-15 | Guang Huang T | Multiple cell battery charger configured with a parallel topology |
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2011
- 2011-01-20 TW TW100201318U patent/TWM407536U/en not_active IP Right Cessation
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2012
- 2012-01-18 AU AU2012200285A patent/AU2012200285B2/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050275373A1 (en) * | 2004-06-09 | 2005-12-15 | Guang Huang T | Multiple cell battery charger configured with a parallel topology |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM407536U (en) | 2011-07-11 |
| AU2012200285A1 (en) | 2012-08-09 |
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| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |