CN211480911U - Battery pack protection circuit and battery pack - Google Patents
Battery pack protection circuit and battery pack Download PDFInfo
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- CN211480911U CN211480911U CN201921981679.1U CN201921981679U CN211480911U CN 211480911 U CN211480911 U CN 211480911U CN 201921981679 U CN201921981679 U CN 201921981679U CN 211480911 U CN211480911 U CN 211480911U
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Abstract
The utility model relates to a battery package protection circuit and battery package, including power port, monitoring module, switch module and signal port. The positive pole of the power supply port is connected with the positive pole of the battery pack, the negative pole of the power supply port is connected with the negative pole of the battery pack, and the power supply port is used for connecting external equipment; the monitoring module is connected with the battery pack and used for detecting the voltage of the battery pack and outputting a corresponding abnormal signal according to the voltage; the switch module is disconnected under the action of the abnormal signal and generates an abnormal state signal, so that the external equipment stops operating the battery pack after detecting the abnormal state signal through the signal port. By adopting the switch units connected in series, when one of the switch units is short-circuited, the short-circuited switch unit can be regarded as a lead, so that one or more switch units are short-circuited, and the normal working state of the switch module cannot be influenced. Furthermore, the battery pack protection circuit can be ensured to work normally, and the phenomenon of protection failure is avoided.
Description
Technical Field
The utility model relates to a battery package field especially relates to battery package protection circuit.
Background
With the development of new energy technologies, lithium batteries are widely used in electric vehicles, energy storage systems, electric tools, and the like. To improve energy storage, several cells are grouped together to form a battery pack. If a certain component in the battery pack is abnormal, the protection of the battery pack can be disabled, and further the problems of liquid leakage, fire, explosion and the like of the battery pack are caused, so that huge potential safety hazards are brought to human bodies and properties.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a battery pack protection circuit for solving the problem of failure of battery pack protection caused by abnormality of elements in the battery pack.
A battery pack protection circuit for abnormal protection of a battery pack in a charging and discharging process, comprising:
the positive electrode of the power port is connected with the positive electrode of the battery pack, the negative electrode of the power port is connected with the negative electrode of the battery pack, and the power port is used for connecting external equipment;
the monitoring module is used for monitoring the voltage of the battery pack and outputting an abnormal signal according to the voltage of the battery pack;
the switch module comprises at least two switch units, the at least two switch units are connected in series, and the control end of each switch unit is respectively connected with the monitoring module;
the signal port is connected with the switch module and is used for accessing the external equipment;
the switch module is used for being switched off under the action of the abnormal signal, and the switch module generates an abnormal state signal so that the external equipment stops operating the battery pack after detecting the abnormal state signal through the signal port.
In one embodiment, the switch module comprises a first switch unit and a second switch unit;
the first end of the first switch unit is a control end and is connected with the monitoring module, the second end of the first switch unit is connected with the second end of the second switch unit, and the third end of the first switch unit is connected with the signal port;
the first end of the second switch unit is a control end and is connected with the monitoring module, the second end of the second switch unit is connected with the second end of the first switch unit, and the third end of the second switch unit is grounded.
In one embodiment, when the first switch unit is short-circuited, the second switch unit receives the abnormal signal and is turned off under the action of the abnormal signal, and the second switch unit generates an abnormal state signal, so that the external device stops operating the battery pack after detecting the abnormal state signal; or
When the second switch unit is short-circuited, the first switch unit receives the abnormal signal and is switched off under the action of the abnormal signal, and the first switch unit generates an abnormal state signal, so that the external equipment stops operating the battery pack after detecting the abnormal state signal.
In one embodiment, the monitoring module comprises a first monitoring unit and a second monitoring unit;
the first monitoring unit is used for monitoring the voltage of the battery pack and outputting a first abnormal signal according to the voltage of the battery pack;
the second monitoring unit is used for monitoring the voltage of the battery pack and outputting a second abnormal signal according to the voltage of the battery pack;
the output end of the first monitoring unit is connected with the first end of the first switch unit and the first end of the second switch unit, the output end of the second monitoring unit is connected with the first end of the first switch unit and the first end of the second switch unit, the first switch unit and the second switch unit are used for being disconnected under the action of the first abnormal signal or the second abnormal signal to generate an abnormal state signal, and the external equipment stops operating the battery pack after detecting the abnormal state signal.
In one embodiment, the first switching unit comprises a transistor Q1, and the second switching unit comprises a transistor Q2;
the control terminal of the transistor Q1 is connected to the logic unit, the control terminal of the transistor Q2 is connected to the logic unit, the first pole of the transistor Q1 is connected to the second pole of the transistor Q2, and the second pole of the transistor Q1 is connected to the signal port; the first pole of the transistor Q2 is connected to ground.
In one embodiment, the monitoring device further comprises a filtering module, one end of the filtering module is connected with the battery pack, and the other end of the filtering module is respectively connected with the first monitoring unit and the second monitoring unit.
In one embodiment, the filtering module includes a plurality of RC filtering units, one end of each RC filtering unit is respectively and correspondingly connected to a single battery in the battery pack, and the other end of each RC filtering unit is respectively and correspondingly connected to the input end of the first monitoring unit and the input end of the second monitoring unit.
In one embodiment, the intelligent temperature control device further comprises a temperature detection module, wherein one end of the temperature detection module is connected with the switch module, and the other end of the temperature detection module is connected with the signal port.
In one embodiment, the temperature detecting module includes a thermistor NTC, one end of which is connected to the second pole of the transistor Q1, and the other end of which is connected to the signal port.
In one embodiment, the temperature detection module further comprises a voltage stabilization module, one end of the voltage stabilization module is connected with the temperature detection module and the signal port, and the other end of the voltage stabilization module is grounded.
In one embodiment, the voltage stabilizing module comprises a voltage stabilizing diode ZD, an anode of the voltage stabilizing diode ZD is connected to one end of the thermistor NTC and the signal port, and a cathode of the voltage stabilizing diode ZD is grounded.
A battery pack comprises the battery pack protection circuit.
According to the battery pack and the battery pack protection circuit, the switch units are connected in series, when one switch unit is short-circuited, the short-circuited switch unit can be regarded as a lead, so that one or more switch units are short-circuited, and the normal working state of the switch module cannot be influenced. Furthermore, the battery pack protection circuit can be ensured to work normally, and the phenomenon of protection failure is avoided.
Drawings
Fig. 1 is a block diagram of a battery pack protection circuit according to an embodiment of the present application;
fig. 2 is a block diagram of a battery pack protection circuit according to another embodiment of the present application;
fig. 3 is a schematic diagram of a battery pack protection circuit according to an embodiment of the present application.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, an embodiment of the present application provides a battery pack protection circuit, which includes a power port, a monitoring module 100, and a switch module 200.
The power port includes a positive a1 and a negative a 2. The positive electrode a1 is connected to the positive electrode of the battery pack, the negative electrode a2 is connected to the negative electrode of the battery pack, and the power port is used for connecting an external device.
The monitoring module 100 is configured to monitor a voltage of the battery pack and output an abnormal signal according to the voltage of the battery pack. The battery pack comprises a plurality of single batteries connected in series, and the voltage of the battery pack can be the whole pack voltage of all the single batteries connected in series or the voltage of each single battery. The monitoring module 100 detects the voltage of each single battery as an example. The monitoring module 100 is provided with a first threshold voltage and a second threshold voltage, and the first threshold voltage is greater than the second threshold voltage. When the monitoring module 100 monitors that the voltage of one of the single batteries is greater than the first threshold voltage, it is determined that the battery pack is overcharged. When the monitoring module 100 monitors that the voltage of one of the single batteries is smaller than the second threshold voltage, it is determined that the battery pack is overdischarged. When the battery pack is overcharged or overdischarged, the monitoring module 100 outputs an abnormal signal. When the monitoring module 100 monitors that the voltage of each single battery is greater than the second threshold voltage and less than the first threshold voltage, it is determined that the battery pack is in a normal state, and the monitoring module 100 may output a normal signal to the outside.
The switch module 200 includes at least two switch units, and at least two switch units are connected in series, and the control end of each switch unit is connected to the monitoring module. The signal port A3 is connected with the switch module and is used for accessing external equipment. The switch module 200 is configured to be turned off by the abnormal signal, and the switch module 200 generates the abnormal state signal, so that the external device stops operating the battery pack after detecting the abnormal state signal through the signal port a 3. When the external device is a charger, the charger stops charging the battery pack after receiving the abnormal signal. When the external equipment is the electrical appliance, the electrical appliance prohibits the battery pack from discharging after receiving the abnormal signal.
In this embodiment, the switch module 200 includes at least two switch units connected in series, and a control terminal of each switch unit is connected to the monitoring module 100. When one of the switch units is short-circuited, the short-circuited switch unit can be regarded as a conducting wire, so that one or more switch units are short-circuited, and the normal working state of the switch module cannot be influenced. And then, can guarantee that battery package protection circuit normally works. The phenomenon of protection failure is avoided.
In the battery pack protection circuit provided in the above embodiment, the switch module 200 includes a plurality of switch units connected in series, when one of the switch units is short-circuited, the short-circuited switch unit can be regarded as a conducting wire, and the rest of the switch units can operate normally without affecting the function of the switch module 200. Therefore, the switch units connected in series can prevent the situation of protection failure, and the use safety of the battery pack is improved.
In one embodiment, please continue to refer to fig. 1, the switch module 200 includes two switch units, which are a first switch unit 210 and a second switch unit 220, respectively. A first end, that is, a control end, of the first switching unit 210 is connected to the monitoring module 100, a second end of the first switching unit 210 is connected to a second end of the second switching unit 220, and a third end of the first switching unit 210 is connected to the signal port a 3. A first end, that is, a control end, of the second switching unit 220 is connected to the monitoring module 100, a second end of the second switching unit 220 is connected to a second end of the first switching unit 210, and a third end of the second switching unit 220 is grounded.
Further, when the first switching unit 210 is short-circuited, the first switching unit 210 may be regarded as a wire, and thus the second terminal of the first switching unit 220 is connected to the signal port a 3. The second switching unit 220 receives the abnormal signal output by the monitoring module 100 and is turned off by the abnormal signal. The second switching unit 220 generates an abnormal state signal to stop the operation of the battery pack after the external device detects the abnormal state signal. Or, when the second switching unit 220 is short-circuited, the second switching unit 220 is regarded as a conductive line, and the second terminal of the first switching unit 210 is grounded. The first switching unit 210 receives the abnormal signal and is turned off by the abnormal signal, and the first switching unit 210 generates the abnormal state signal, so that the external device stops the operation of the battery pack after detecting the abnormal state signal.
The embodiment adopts two switch units connected in series, can prevent the failure of the protection circuit when one of the switch units is short-circuited, and adopts the two switch units connected in series to reduce the number of components in the protection circuit, thereby having simple circuit structure and low cost.
Referring to fig. 2, in one embodiment, the monitoring module 100 includes a first monitoring unit 110 and a second monitoring unit 120. The first monitor cell 210 and the second monitor cell 220 are each provided with a first threshold voltage and a second threshold voltage. The first monitoring unit 110 is configured to monitor a voltage of the battery pack, compare the voltage of the battery pack with a first threshold voltage and a second threshold voltage, and output a first abnormal signal according to the voltage of the battery pack. The second monitoring unit 120 is configured to monitor the voltage of the battery pack, compare the voltage of the battery pack with a first threshold voltage and a second threshold voltage, and output a second abnormal signal according to the voltage of the battery pack. An output terminal of the first monitoring unit 110 is connected to a first terminal of the first switching unit 210 and a first terminal of the second switching unit 220. An output terminal of the second monitoring unit 120 is connected to a first terminal of the first switching unit 210 and a first terminal of the second switching unit 220. The first switch unit 210 and the second switch unit 220 are configured to be turned off by the first abnormal signal or the second abnormal signal, and the signal port a3 generates an abnormal state signal, so that the external device stops operating the battery pack after detecting the abnormal state signal.
In this embodiment, the first monitoring unit 110 and the second monitoring unit 120 may use the same chip. When the first monitoring unit 110 fails, the second monitoring unit 120 can still operate normally, or when the second monitoring unit 120 fails, the first monitoring unit 110 can still operate normally. Of course, different kinds of chips may be used, for example, the first monitoring unit 110 may be a high-function chip to detect whether the battery pack is overcharged or overdischarged and has a disconnection problem, and the second monitoring unit 120 may be a low-function chip to detect whether the battery pack is overcharged or overcharged. The common chip is the first monitoring unit 110, and when the first monitoring unit 110 fails, the spare second monitoring unit 120 can be used. Since the second monitoring module 200 has fewer functions, the cost is low, and the cost of the protection circuit can be further reduced.
Since the first monitoring unit 110 and the second monitoring unit 120 can independently monitor the voltage of the battery pack, when one of the control units is abnormal, the other control unit can still continue to work, so that the working state of the whole protection circuit is not affected.
Further, in one embodiment, please continue to refer to fig. 2, the monitoring module 100 may further include a logic unit 130. The logic unit 130 receives the output signals of the first monitoring unit 110 and the second monitoring unit 120 and then controls the first switch unit 210 and the second switch unit 220 to be turned on or off. Specifically, the logic unit 130 includes a first input terminal connected to the first monitoring unit 110, a second input terminal connected to the second monitoring unit 120, and an output terminal connected to the first terminal of the first switching unit 210 and the first terminal of the second switching unit 220. The first and second monitoring units 110 and 120 transmit a first abnormal signal, a second abnormal signal, or a normal signal to the logic unit 130 according to the battery pack voltage. When the logic unit 130 receives the first abnormal signal or the second abnormal signal, the first switching unit 210 and the second switching unit 220 may be controlled to be turned off, so that the external device stops operating the battery pack after detecting the abnormal state signal generated by the switching module 200.
In one embodiment, referring to fig. 3, the first switch unit 210 includes a transistor Q1, and the second switch unit 220 includes a transistor Q2. The transistor is adopted as a switch, so that automatic control is facilitated, and the transistor is small in size, so that the circuit size can be reduced.
Further, the control terminal of the transistor Q1 is connected to the logic unit 130, the first pole of the transistor Q1 is connected to the second pole of the transistor Q2, and the second pole of the transistor Q1 is connected to the signal port A3. The control terminal of the transistor Q2 is connected to the logic unit 130, and the first pole of the transistor Q2 is connected to ground.
In this embodiment, the transistors Q1 and Q2 are both N-channel transistors, the control terminal is the gate of the transistor, i.e. the control terminal of the first switch unit 210, the first electrode is the source of the transistor, and the second electrode is the drain of the transistor. The abnormal signals output by the first monitoring unit 110 and the second monitoring unit 120 are high level signals, and the high level signals turn on the transistors Q1 and Q2, so that the external device does not operate the battery pack. When one of the transistors is shorted, the shorted transistor can be viewed as a wire, thereby not affecting the normal operation of the other transistor. Therefore, the battery pack protection circuit cannot be disabled no matter any one of the switching devices is short-circuited by adopting the switching devices connected in series.
Further, a resistor R1 is further included between the output terminal of the first monitoring unit 110 and the control terminal of the transistor Q1, a resistor R2 is further included between the output terminal of the second monitoring unit 120 and the control terminal of the transistor Q2, and the resistor R1 and the resistor R2 are used for voltage division. In the embodiment, the double-control module is adopted to control the switch module, so that when one of the resistors is in an open-circuit state, the other resistor can still work, and when the resistor is in a short-circuit state, the short-circuit resistor can be regarded as a lead, so that the effect of the protection circuit is not influenced.
In one embodiment, the battery pack protection circuit further includes a filter module, one end of the filter module is connected to the battery pack, and the other end of the filter module is connected to the first monitoring unit 110 and the second monitoring unit 120.
Specifically, referring to fig. 2, the filtering module includes a plurality of RC filtering units 400, each RC filtering unit includes a resistor and a capacitor, wherein one end of the resistor is connected to the positive electrode of the battery, the other end of the resistor is respectively connected to one end of the capacitor, the input end of the first monitoring unit 110 and the input end of the second monitoring unit 120, the other end of the capacitor is connected to the negative electrode of the battery pack, and the RC filtering unit 400 is configured to filter the interference noise at the battery end. In this embodiment, the first monitoring unit 110 and the second monitoring unit 120 may share the filtering module, so as to reduce the number of components in the circuit and reduce the size of the circuit.
In one embodiment, the battery pack protection circuit further comprises a temperature detection module, wherein one end of the temperature detection module is connected with the switch module, and the other end of the temperature detection module is connected with the signal port A3. Specifically, in this embodiment, the temperature detecting module is a thermistor NTC. The thermistor NTC has one end connected to the second pole of the transistor Q1 and the other end connected to the signal port A3. When the charger charges the battery pack, the charger can detect the resistance value of the thermistor through the signal port A3, and then detect the temperature of the battery pack. If the temperature of the battery pack is abnormal, the charger stops charging the battery pack. In this embodiment, the signal port a3 can not only output the overcharge state signal of the battery pack, but also output the temperature signal, thereby realizing the port multiplexing, reducing the number of ports, and simplifying the circuit structure.
In one embodiment, the battery pack protection circuit further comprises a voltage stabilizing module, one end of the voltage stabilizing module is connected with the temperature detection module and the signal port A3, and the other end of the voltage stabilizing module is grounded. Specifically, the voltage stabilizing module in this embodiment may be a zener diode ZD. The zener diode ZD is connected in parallel with the capacitor C1 to protect the circuit and also to filter out interference noise.
Another embodiment of the present application provides a battery pack including the aforementioned battery pack protection circuit.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (13)
1. A battery pack protection circuit for abnormal protection of a battery pack in a charging and discharging process, comprising:
the positive electrode of the power port is connected with the positive electrode of the battery pack, the negative electrode of the power port is connected with the negative electrode of the battery pack, and the power port is used for connecting external equipment;
the monitoring module is used for monitoring the voltage of the battery pack and outputting an abnormal signal according to the voltage of the battery pack;
the switch module comprises at least two switch units, the at least two switch units are connected in series, and the control end of each switch unit is respectively connected with the monitoring module;
the signal port is connected with the switch module and is used for accessing the external equipment;
the switch module is used for being switched off under the action of the abnormal signal, and the switch module generates an abnormal state signal so that the external equipment stops operating the battery pack after detecting the abnormal state signal through the signal port.
2. The battery pack protection circuit of claim 1, wherein the switch module comprises a first switch unit and a second switch unit;
the first end of the first switch unit is a control end and is connected with the monitoring module, the second end of the first switch unit is connected with the second end of the second switch unit, and the third end of the first switch unit is connected with the signal port;
the first end of the second switch unit is a control end and is connected with the monitoring module, the second end of the second switch unit is connected with the second end of the first switch unit, and the third end of the second switch unit is grounded.
3. The battery pack protection circuit according to claim 2, wherein when the first switching unit is short-circuited, the second switching unit receives the abnormal signal and is turned off by the abnormal signal, and the second switching unit generates an abnormal state signal so that the external device stops operating the battery pack after detecting the abnormal state signal; or
When the second switch unit is short-circuited, the first switch unit receives the abnormal signal and is switched off under the action of the abnormal signal, and the first switch unit generates an abnormal state signal, so that the external equipment stops operating the battery pack after detecting the abnormal state signal.
4. The battery pack protection circuit of claim 3, wherein the monitoring module comprises a first monitoring unit and a second monitoring unit;
the first monitoring unit is used for monitoring the voltage of the battery pack and outputting a first abnormal signal according to the voltage of the battery pack;
the second monitoring unit is used for monitoring the voltage of the battery pack and outputting a second abnormal signal according to the voltage of the battery pack;
the output end of the first monitoring unit is connected with the first end of the first switch unit and the first end of the second switch unit, the output end of the second monitoring unit is connected with the first end of the first switch unit and the first end of the second switch unit, the first switch unit and the second switch unit are used for being disconnected under the action of the first abnormal signal or the second abnormal signal to generate an abnormal state signal, and the external equipment stops operating the battery pack after detecting the abnormal state signal.
5. The battery pack protection circuit according to claim 4, wherein the monitoring module further comprises a logic unit, and the logic unit receives the output signals of the first monitoring unit and the second monitoring unit and controls the first switch unit and the second switch unit to be switched on or off;
when the first monitoring unit fails, the second monitoring unit outputs a second abnormal signal to the logic unit according to the voltage of the battery pack, and when the second monitoring unit fails, the first monitoring unit outputs a first abnormal signal to the logic unit according to the voltage of the battery pack;
the logic unit controls the first switch unit and the second switch unit to be switched off according to the first abnormal signal and/or the second abnormal signal, and the first switch unit and/or the second switch unit generates an abnormal state signal so that the external device detects the abnormal state signal and stops operating the battery pack.
6. The battery pack protection circuit of claim 5, wherein the first switching unit comprises a transistor Q1, and the second switching unit comprises a transistor Q2;
the control terminal of the transistor Q1 is connected to the logic unit, the control terminal of the transistor Q2 is connected to the logic unit, the first pole of the transistor Q1 is connected to the second pole of the transistor Q2, and the second pole of the transistor Q1 is connected to the signal port; the first pole of the transistor Q2 is connected to ground.
7. The battery pack protection circuit according to claim 6, further comprising a filter module, wherein one end of the filter module is connected to the battery pack, and the other end of the filter module is connected to the first monitoring unit and the second monitoring unit, respectively.
8. The battery pack protection circuit according to claim 7, wherein the filtering module includes a plurality of RC filtering units, one end of each RC filtering unit is respectively and correspondingly connected to a single battery in the battery pack, and the other end of each RC filtering unit is respectively and correspondingly connected to the input end of the first monitoring unit and the input end of the second monitoring unit.
9. The battery pack protection circuit of claim 8, further comprising a temperature detection module, wherein one end of the temperature detection module is connected to the switch module, and the other end of the temperature detection module is connected to the signal port.
10. The battery pack protection circuit of claim 9, wherein the temperature detection module comprises a thermistor NTC having one end connected to the second pole of the transistor Q1 and the other end connected to the signal port.
11. The battery pack protection circuit according to claim 10, further comprising a voltage stabilization module, wherein one end of the voltage stabilization module is connected to the temperature detection module and the signal port, and the other end of the voltage stabilization module is grounded.
12. The battery pack protection circuit according to claim 11, wherein the voltage stabilizing module comprises a voltage stabilizing diode ZD, an anode of the voltage stabilizing diode ZD is connected to one end of the thermistor NTC and the signal port, and a cathode of the voltage stabilizing diode ZD is grounded.
13. A battery pack comprising the battery pack protection circuit according to any one of claims 1 to 12.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822240073 | 2018-12-28 | ||
| CN2018222400734 | 2018-12-28 |
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| CN211480911U true CN211480911U (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921981679.1U Active CN211480911U (en) | 2018-12-28 | 2019-11-15 | Battery pack protection circuit and battery pack |
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| CN (1) | CN211480911U (en) |
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Effective date of registration: 20200910 Address after: 215123 Jiangsu Province, Suzhou City Industrial Park East Road, No. 18 Patentee after: Positec Power Tools (Suzhou) Co.,Ltd. Address before: 215123 Jiangsu Province, Suzhou City Industrial Park East Road, No. 18 Patentee before: Bao Shi De Technology (China) Co.,Ltd. |