CN216121851U - Three-wire system charging structure of two strings of batteries - Google Patents
Three-wire system charging structure of two strings of batteries Download PDFInfo
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- CN216121851U CN216121851U CN202122128856.5U CN202122128856U CN216121851U CN 216121851 U CN216121851 U CN 216121851U CN 202122128856 U CN202122128856 U CN 202122128856U CN 216121851 U CN216121851 U CN 216121851U
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Abstract
The utility model relates to a three-wire system charging structure of two strings of batteries, which comprises an electricity meter, two strings of batteries and a charger, wherein the electricity meter is connected with the two strings of batteries; the two strings of batteries comprise a first string of batteries and a second string of batteries, the middle stage of the two strings of batteries after being connected in series is connected with a first charging circuit, the positive end and the negative end of the two strings of batteries are respectively connected with a second charging circuit and a third charging circuit, and the first charging circuit, the second charging circuit and the third charging circuit are all connected with the output end of the charger; and the electricity meter is respectively connected with the charger and the two strings of batteries and is used for detecting the cell voltages of the two strings of batteries and feeding back the cell voltages to the charger. The utility model solves the problem of weak conventional balancing capability, ensures complete balancing of the battery when fully charged and has no interference of balanced temperature rise. The utility model can be widely applied in the technical field of batteries.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a three-wire charging structure of two strings of batteries.
Background
At present, the voltage balance of two strings of batteries adopts discharge balance, because the balance current is small, the balance capability is weaker, especially under the condition that the charging time of the FFC is short, the charging is finished, but the voltage difference of two battery cores is not balanced to an ideal value; and the devices in the equalization loop generate heat during discharge equalization, which affects temperature detection.
It is urgently needed to provide a charging structure capable of solving the problems of weak discharging balance capability and balanced heating.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a three-wire charging structure for two strings of batteries, which solves the problem of weak conventional equalization capability, ensures complete equalization of the batteries during full charge, and has no interference of equalization temperature rise.
In order to achieve the purpose, the utility model adopts the following technical scheme: a three-wire system charging structure of two strings of batteries comprises an electricity meter, two strings of batteries and a charger; the two strings of batteries comprise a first string of batteries and a second string of batteries, the middle stage of the two strings of batteries after being connected in series is connected with a first charging circuit, the positive end and the negative end of the two strings of batteries are respectively connected with a second charging circuit and a third charging circuit, and the first charging circuit, the second charging circuit and the third charging circuit are all connected with the output end of the charger; and the electricity meter is respectively connected with the charger and the two strings of batteries and is used for detecting the cell voltages of the two strings of batteries and feeding back the cell voltages to the charger.
Furthermore, the output end of the charger is provided with a positive electrode pin PACK +, a negative electrode pin PACK-and an intermediate level pin PACKM.
Further, the input of first charging line with the pin PACKM end connection of charger output end, the second charging line with the pin PACK + end connection of charger output end, the third charging line with the pin PACK-end connection of charger output end.
Further, the three-wire charging structure further comprises a charging protection module; the charging protection module is arranged on the second charging circuit and the third charging circuit, and the controlled end of the charging protection module is connected with the fuel gauge.
Further, the charging protection module is composed of a first group of MOS transistors and a second group of MOS transistors.
Further, the first group of MOS transistors is connected to the second charging line, and is respectively connected to the first serial battery and a pin PACK + terminal of the charger, so as to protect a positive terminal of the battery; the second group of MOS tubes are connected to the third charging line, are respectively connected with the second string of batteries and a pin PACK-end of the charger, and are used for protecting a negative end of the battery; the controlled ends of the first group of MOS tubes and the second group of MOS tubes are connected with the electricity meter, and the work state of each group of MOS tubes is controlled by the electricity meter.
Furthermore, the first group of MOS tubes adopt high-voltage MOS tubes.
Further, the electricity meter and the charger are connected through a data line SDA and a clock line SCL.
Further, the electricity meter is respectively connected with the positive end and the negative end of the two strings of batteries and the intermediate level of the two strings of batteries, and is used for detecting the cell voltages of the two strings of batteries.
Further, the electricity meter adopts a GAUGE IC with a protection function.
Due to the adoption of the technical scheme, the utility model has the following advantages:
1. the utility model is provided with the electricity meter which feeds back the detected cell voltages of the two strings of batteries to the charger, and the charger charges and adjusts the two strings of batteries according to the received two cell voltages, thereby realizing stronger battery voltage balancing capability and ensuring the complete voltage balance after the batteries are charged.
2. The electricity meter is used for respectively collecting the voltages of the positive end and the negative end of the two strings of batteries and the voltage between the two strings of batteries so as to effectively ensure that the voltage difference of the batteries is always kept within a specification value from the beginning to the end of charging.
3. The utility model is not provided with an additional equalizing circuit, realizes circuit equalization through the electricity meter and the charging protection module, and only the charging loop generates heat, thereby avoiding the problem of abnormal temperature detection caused by the heating of the additional equalizing circuit in the prior art.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the utility model, are within the scope of the utility model.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the present invention provides a three-wire charging structure of two strings of batteries, which includes an electricity meter, two strings of batteries, and a charger. Wherein:
the output of charger is provided with three PIN PIN: a positive electrode pin PACK +, a negative electrode pin PACK-and an intermediate stage pin PACKM; the three pins are respectively and correspondingly arranged with the anode, the cathode and the three charging ports of the middle stage of the charger.
The two strings of batteries comprise a first string of batteries CELL1 and a second string of batteries CELL2, the middle stage of the two strings of batteries after being connected in series is connected with a first charging circuit, the positive end and the negative end of the two strings of batteries are respectively connected with a second charging circuit and a third charging circuit, and the first charging circuit, the second charging circuit and the third charging circuit are all connected with the output end of the charger; the method specifically comprises the following steps:
the input end of the first charging line is connected with a pin PACKM end of the output end of the charger; the second charging circuit is connected with a pin PACK + end of the output end of the charger, and the third charging circuit is connected with a pin PACK-end of the output end of the charger; two charging loops are formed between the two battery cells to charge the two battery cells simultaneously;
and the electricity meter is respectively connected with the charger and the two strings of batteries and is used for detecting the cell voltages of the two strings of batteries and feeding back the cell voltages to the charger in real time, and the charger dynamically adjusts the charging current of the corresponding cell according to the fed-back voltage so that the voltage difference of the two cells can be kept within a preset specification value from the beginning to the end of charging.
In a preferred embodiment, the three-wire charging structure further comprises a charging protection module. The charging protection module is arranged on the second charging circuit and the third charging circuit, and the controlled end of the charging protection module is connected with the electric quantity meter and used for charging protection of the two strings of batteries.
Preferably, the charging protection module is composed of a first group of MOS transistors and a second group of MOS transistors. The first group of MOS tubes are connected to a second charging line, are respectively connected with the first string of batteries and a pin PACK + end of the charger and are used for protecting the positive end of the batteries; and the second group of MOS tubes are connected on a third charging line, are respectively connected with the second string of batteries and the pin PACK-end of the charger, and are used for protecting the negative end of the battery. The controlled ends of the first group of MOS tubes and the second group of MOS tubes are connected with an electricity meter, and the work state of each group of MOS tubes is controlled by the electricity meter. When the charging protection module is used, the positive end voltage, the withstand voltage, the cell voltage and the charging voltage of the battery are superposed, and after a voltage difference is generated, the charging protection module starts charging.
In this embodiment, preferably, the first group of MOS transistors uses high-voltage MOS transistors, and the second group of MOS transistors uses conventional MOS transistors. Wherein the high voltage is 20-30V, and the conventional voltage is 8-12V.
In a preferred embodiment, the electricity meter and the charger are connected through a data line SDA and a clock line SCL; the electricity meter transmits the detected cell voltage data of the two strings of batteries to the charger through the data line SDA and the clock line SCL.
In a preferred embodiment, the electricity meter is respectively connected with the positive end and the negative end of the two strings of batteries and the intermediate stage of the two strings of batteries, and is used for detecting the cell voltages of the two strings of batteries so as to keep the two cell voltages synchronous.
In the above embodiments, the electricity meter is preferably a GAUGE IC with a protection function.
When the utility model is used, two groups of MOS1 and MOS2 are controlled by a GAUGE IC, the charging protection is respectively carried out on CELL1 and CELL2, and MOS2 is kept normally open during discharging and is protected by MOS 1. During charging, the output end is respectively connected with the CHARGE IC by three PIN (PACK +/PACK-/PACKM) for charging. Only two interfaces PACK +/PACK-are used for discharging. The method specifically comprises the following steps:
after charging is started, the electricity meter transmits the detected cell voltage to the charger in real time; when the voltages of the two battery cells are inconsistent, the charger respectively adjusts the charging currents of the two battery cells: (1) if the charging current is the upper limit current, reducing the current with higher cell voltage for charging; (2) if the charging current is smaller, the current with lower cell voltage is increased for charging, if the current after the increase is calculated to exceed the charging upper limit current, the charging current with lower cell voltage is increased to the upper limit current, and meanwhile, the charging current with higher cell voltage is reduced, and if the charging current does not exceed the upper limit current, only the charging current with lower cell voltage is increased to a calculated value; so as to adjust and keep the voltages of the two cells synchronous.
When CELL1 has charging overcurrent, GAUGE IC turns off MOS1 to protect CELL1, and also turns off MOS2 to prevent CELL2 from being damaged due to abnormal charger; similarly, when CELL2 has charging overcurrent, it also turns off MOS2 and MOS 1.
When CELL1 appears overcharging, GAUGE IC turns off MOS1 to protect CELL1, meanwhile, if CELL2 does not reach overcharging, MOS2 is continuously turned on, CELL2 is continuously charged to the same voltage as CELL1 or charged to cut-off condition; similarly, when CELL2 is overcharged, the protection principle is the same.
During discharging, discharging is carried out through PACK +/PACK-, and the PACKM is not connected to a discharging loop.
During discharging, the MOS2 is kept in a normally open state, the MOS1 is used as a conventional protection, and when over-discharging, discharging overcurrent and short-circuiting occur, the GAUGE IC turns off the MOS1 for protection.
Permanent failure: when the MOS1 is detected to be damaged (when the charging and discharging protection is triggered, the system can still detect the corresponding charging and discharging current, the MOS is considered to be damaged, and the protection is invalid), the GAUGE IC will permanently close the MOS2, and the battery can not be charged and discharged.
In conclusion, the utility model solves the problems of weak discharge balance capability and balanced heating. The utility model adopts a three-wire balance charging structure, on one hand, the requirement of quick charging of two strings can be met, on the other hand, the problem of weak conventional balancing capability is solved, the complete balancing of the battery during full charging is ensured, and no balancing temperature rise interference exists.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. A three-wire system charging structure of two strings of batteries is characterized by comprising an electricity meter, two strings of batteries and a charger;
the two strings of batteries comprise a first string of batteries and a second string of batteries, the middle stage of the two strings of batteries after being connected in series is connected with a first charging circuit, the positive end and the negative end of the two strings of batteries are respectively connected with a second charging circuit and a third charging circuit, and the first charging circuit, the second charging circuit and the third charging circuit are all connected with the output end of the charger;
and the electricity meter is respectively connected with the charger and the two strings of batteries and is used for detecting the cell voltages of the two strings of batteries and feeding back the cell voltages to the charger.
2. The three-wire charging configuration as claimed in claim 1, wherein the output of the charger is provided with a positive pin PACK +, a negative pin PACK-, and an intermediate pin PACKM.
3. The three-wire charging structure of claim 2, wherein the input of the first charging line is connected to pin PACKM of the charger output, the second charging line is connected to pin PACK + of the charger output, and the third charging line is connected to pin PACK-of the charger output.
4. The three-wire charging structure according to claim 1, further comprising a charge protection module; the charging protection module is arranged on the second charging circuit and the third charging circuit, and the controlled end of the charging protection module is connected with the fuel gauge.
5. The three-wire charging structure according to claim 4, wherein the charging protection module is composed of a first group of MOS transistors and a second group of MOS transistors.
6. The three-wire charging structure according to claim 5, wherein the first set of MOS transistors are connected to the second charging line, and are respectively connected to the first string of batteries and the pin PACK + terminal of the charger, for protecting the positive terminal of the batteries; the second group of MOS tubes are connected to the third charging line, are respectively connected with the second string of batteries and a pin PACK-end of the charger, and are used for protecting a negative end of the battery; the controlled ends of the first group of MOS tubes and the second group of MOS tubes are connected with the electricity meter, and the work state of each group of MOS tubes is controlled by the electricity meter.
7. The three-wire charging structure as claimed in claim 5 or 6, wherein the first group of MOS transistors is a high voltage MOS transistor.
8. The three-wire charging arrangement according to claim 1, wherein the electricity meter and the charger are connected by a data line SDA and a clock line SCL.
9. The three-wire charging structure of claim 1, wherein the electricity meter is connected to the positive and negative terminals of the two strings of batteries and the middle stage of the two strings of batteries, respectively, for detecting cell voltages of the two strings of batteries.
10. The three wire charging structure of claim 1, wherein the electricity meter employs a GAUGE IC with a protection function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122128856.5U CN216121851U (en) | 2021-09-01 | 2021-09-01 | Three-wire system charging structure of two strings of batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122128856.5U CN216121851U (en) | 2021-09-01 | 2021-09-01 | Three-wire system charging structure of two strings of batteries |
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| Publication Number | Publication Date |
|---|---|
| CN216121851U true CN216121851U (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122128856.5U Active CN216121851U (en) | 2021-09-01 | 2021-09-01 | Three-wire system charging structure of two strings of batteries |
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| CN (1) | CN216121851U (en) |
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- 2021-09-01 CN CN202122128856.5U patent/CN216121851U/en active Active
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