CN212366054U - Battery parallel control device - Google Patents
Battery parallel control device Download PDFInfo
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- CN212366054U CN212366054U CN202021879157.3U CN202021879157U CN212366054U CN 212366054 U CN212366054 U CN 212366054U CN 202021879157 U CN202021879157 U CN 202021879157U CN 212366054 U CN212366054 U CN 212366054U
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- switch
- battery
- battery module
- voltage
- limiting resistor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model discloses a battery parallel control device, including a plurality of parallelly connected battery module of N, N-1 battery module establishes ties there is the equalizing device, the equalizing device includes first switch, current-limiting resistor, second switch, and first switch is parallelly connected with the second switch after establishing ties with current-limiting resistor, the utility model discloses simple structure when battery module starts, can detect the voltage of every module respectively, and every battery module is inside to have the control unit (BMS usually) of measuring voltage, then gives the processing unit contrast with data, and the contrast result voltage appears and is greater than the value X that sets up, then can control and issue and use balanced control strategy, through the equalizing device, makes voltage balance.
Description
Technical Field
The utility model discloses battery technical field, concretely relates to battery parallel control device.
Background
The battery modules may have unequal voltages in different battery modules for various reasons, and if the batteries with unequal voltages are directly connected together, a particularly large current (up to 200A or more) may be generated, which is very dangerous. Therefore, it is very important to obtain a battery parallel control device and a control method.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned at least one technical problem, the utility model provides a battery parallel control device, including a plurality of parallelly connected battery module of N, a plurality of battery module establish ties there is equalizing device N-1, equalizing device includes first switch, current-limiting resistor, second switch, and first switch is parallelly connected with the second switch after establishing ties with current-limiting resistor. N is an integer of 2 or more.
The battery module is internally provided with a control unit for detecting voltage, the control unit transmits the detected voltage data of the battery module to the processing unit, and the processing unit controls the first switch and the second switch to be switched on and off.
It should be noted that the instant current is u/R, and the magnitude of the current limiting resistor is selected according to the overcurrent capability of the protection devices such as the whole loop switch, the overcurrent capability of the contact, and the like. The current limiting resistor satisfies:
wherein U1 is the open circuit voltage of the cells in the battery module, ImaxIs the maximum current of the device.
A control method of a battery parallel control device comprises the following steps: the control unit of each battery module detects the voltage data of the battery module and transmits the voltage data to the processing unit; the processing unit compares the transmitted data with X, if the transmitted data is larger than X, unbalance occurs, and the processing unit controls the balancing device to work in a mode one; if the voltage is less than X, the battery is balanced, and the processing unit controls the balancing device to work in a mode two mode.
The working mode of the mode one is as follows: the balancing module closes the first switch and opens the second switch, so that the current passes through the current-limiting resistor and is limited within a safety range. And when the processing unit compares the data transmitted by the control unit with X and is smaller than X, all the equalizing devices turn on the second switches and then turn off the first switches to finish the parallel equalization of the batteries.
The working mode of the mode two is as follows: the equalization module directly closes the second switch and disconnects the first switch, equalization operation is not needed, the battery module is directly started, and starting time is greatly prolonged.
X is the difference between the voltage of the battery module regarded as standard and the voltage of the battery module, which is a battery module without a series balancing device. The value of X is U2 of 5-15 per mill, wherein U2 is the voltage of the battery module regarded as standard. Preferably, X is 5 ‰ U2, and the closer X is to 5 ‰ U2, the better the effect, but the more time is needed; the closer the value of X is to 15 per thousand U2, the less time is spent, but the effect is poor.
The utility model has the advantages of it is following: the utility model discloses simple structure, when battery module starts, can detect the voltage of every module respectively, every battery module is inside to have the control unit (BMS usually) of detection voltage, then compares data transfer processing unit, and the contrast result voltage appearing is greater than the setting value X, then can control and issue and use balanced control strategy, through balancing unit, makes voltage balance.
Drawings
FIG. 1 is a view of the structure of the present invention;
FIG. 2 is a flow chart of the control method of the present invention;
reference numerals: 1-a battery module; 2-equalizing means; s1 — a first switch; s2 — a second switch; r-current limiting resistor.
Detailed Description
In order to better understand the invention for those skilled in the art and to define the claimed scope more clearly, the invention will be described in detail below with respect to certain specific embodiments of the invention. It should be noted that the following description is only a few examples of the present invention, and the specific and direct descriptions of the related structures are only for the convenience of understanding the present invention, and the specific features do not naturally and directly limit the scope of the present invention.
Referring to the drawings, in one aspect, the utility model provides a battery parallel control device, including N parallelly connected battery module, N-1 battery module establishes ties there is equalizing device, equalizing device includes first switch, current limiting resistor, second switch, and first switch is parallelly connected with the second switch after establishing ties with current limiting resistor. N is an integer of 2 or more.
The battery module is internally provided with a control unit for detecting voltage, the control unit transmits the detected voltage data of the battery module to the processing unit, and the processing unit controls the first switch and the second switch to be switched on and off.
It should be noted that the instant current is u/R, and the magnitude of the current limiting resistor is selected according to the overcurrent capability of the protection devices such as the whole loop switch, the overcurrent capability of the contact, and the like. The current limiting resistor satisfies:
wherein U1 is the open circuit voltage of the cells in the battery module, ImaxIs the maximum current of the device.
The utility model provides a control method of battery parallel control device, including following step: receiving a starting signal; the control unit of each battery module detects the voltage data of the battery module and transmits the voltage data to the processing unit; the processing unit compares the transmitted data with X, if the transmitted data is larger than X, unbalance occurs, and the processing unit controls the balancing device to work in a mode one; if the voltage is less than X, the battery is balanced, and the processing unit controls the balancing device to work in a mode two mode.
The working mode of the mode one is as follows: the balancing module closes the first switch and opens the second switch, so that the current passes through the current-limiting resistor and is limited within a safety range. And when the processing unit compares the data transmitted by the control unit with X and is smaller than X, all the equalizing devices turn on the second switches and then turn off the first switches to finish the parallel equalization of the batteries.
The working mode of the mode two is as follows: the equalization module directly closes the second switch and disconnects the first switch, equalization operation is not needed, the battery module is directly started, and starting time is greatly prolonged.
X is the difference between the voltage of the battery module regarded as standard and the voltage of the battery module, which is a battery module without a series balancing device. The value of X is U2 of 5-15 per mill, wherein U2 is the voltage of the battery module regarded as standard. Preferably, X is 5 ‰ U2, and the closer X is to 5 ‰ U2, the better the effect, but the more time is needed; the closer the value of X is to 15 per thousand U2, the less time is spent, but the effect is poor.
The utility model has the advantages of it is following: the utility model discloses simple structure, when battery module starts, can detect the voltage of every module respectively, every battery module is inside to have the control unit of detection voltage, then gives the processing unit contrast with data, and voltage appears in the contrast result and is greater than the setting value X, then can control and issue and use balanced control strategy, through balancing unit, makes voltage balance.
The above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (4)
1. A battery parallel control device is characterized in that: the battery balancing device comprises N battery modules (1) connected in parallel, wherein the N-1 battery modules (1) are connected in series with a balancing device (2), the balancing device (2) comprises a first switch (S1), a current limiting resistor (R) and a second switch (S2), and the first switch (S1) is connected with the current limiting resistor (R) in series and then connected with the second switch (S2) in parallel.
2. The battery parallel control apparatus according to claim 1, characterized in that: the battery pack further comprises a processing unit, wherein the battery module (1) is internally provided with a control unit for detecting voltage, the control unit is used for transmitting the detected voltage data of the battery module (1) to the processing unit, and the processing unit is used for controlling the first switch (S1) and the second switch (S2) to be closed and opened.
3. The parallel battery control apparatus according to claim 1 or 2, characterized in that: the current limiting resistor (R) satisfies:
wherein U1 is the open circuit voltage of the cells in the battery module (1), ImaxIs the maximum current of the device.
4. The battery parallel control apparatus according to claim 1, characterized in that: and N is an integer greater than or equal to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021879157.3U CN212366054U (en) | 2020-09-01 | 2020-09-01 | Battery parallel control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021879157.3U CN212366054U (en) | 2020-09-01 | 2020-09-01 | Battery parallel control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212366054U true CN212366054U (en) | 2021-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021879157.3U Active CN212366054U (en) | 2020-09-01 | 2020-09-01 | Battery parallel control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212366054U (en) |
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2020
- 2020-09-01 CN CN202021879157.3U patent/CN212366054U/en active Active
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