CN109390983B - Battery pack and detection method for battery pack - Google Patents
Battery pack and detection method for battery pack Download PDFInfo
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- CN109390983B CN109390983B CN201710654063.2A CN201710654063A CN109390983B CN 109390983 B CN109390983 B CN 109390983B CN 201710654063 A CN201710654063 A CN 201710654063A CN 109390983 B CN109390983 B CN 109390983B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a battery pack and a detection method for the battery pack, wherein the battery pack comprises: more than one series units connected in series with each other; the voltage detection module is used for respectively detecting the voltages of the plurality of series units; and the controller is used for receiving the voltage detected by the voltage detection module, calculating a voltage difference value between the series units within preset time, and increasing the undervoltage threshold of the battery pack when the voltage difference value exceeds the preset difference value. The battery pack has the advantages that the risk of reverse charging when the battery pack supplies power to the electric tool is reduced, and the safety of the battery pack is improved.
Description
Technical Field
The invention relates to a battery pack and a detection method for the battery pack.
Background
The battery pack serving as a power source of the wireless electric tool is a main link for restricting the development of the wireless electric tool, the conventional battery pack only has an output voltage below 30V, and when the battery pack is used for driving a high-power electric tool, the problem of insufficient power and poor endurance is caused.
When the battery pack adaptive electric tool works under a heavy load working condition, when unbalance occurs in the battery core in the battery pack, the battery core with weak electric quantity in the battery pack is extremely easy to reversely charge, so that potential safety hazards are generated.
Disclosure of Invention
In order to achieve the above object, the present invention adopts the following technical solutions:
a battery pack, comprising: more than one series units connected in series with each other; the voltage detection module is used for respectively detecting the voltages of the plurality of series units; and the controller is used for receiving the voltage detected by the voltage detection module, calculating a voltage difference value between the series units within preset time, and increasing the undervoltage threshold of the battery pack when the voltage difference value exceeds the preset difference value.
Further, the controller calculates a voltage difference value between the series units for a preset time, the voltage difference value being a maximum value of the voltage difference values between the plurality of series units.
Further, the controller decreases the preset time when the voltage difference value exceeds a preset difference value.
Further, before the voltage difference value, the voltage of the series unit is compared with the undervoltage threshold value.
Further, the series unit includes two cells connected in parallel.
A detection method for a battery pack including one or more series units connected in series with each other, the method comprising: detecting the voltage of the series unit; calculating a voltage difference value of the series units within preset time; and when the voltage difference value exceeds a preset difference value, improving the undervoltage threshold value of the battery pack.
Further, the voltage difference value is a maximum voltage value among voltage difference values between the plurality of series units.
Further, the preset time is reduced when the voltage difference exceeds a preset difference.
Further, still include: and comparing the voltage value of the series unit with the undervoltage threshold value.
Further, still include: comparing the voltage value of the series unit with the undervoltage threshold value; and if the voltage difference value is larger than the undervoltage threshold value, calculating the voltage difference value of the series unit within preset time.
The battery pack has the advantages that the risk of reverse charging when the battery pack supplies power to the electric tool is reduced, and the safety of the battery pack is improved.
Drawings
FIG. 1 is a schematic block diagram of one embodiment of a battery pack;
FIG. 2 is a schematic block diagram of one embodiment of a battery pack for implementing a voltage detection portion;
FIG. 3 is a schematic diagram of the connection of a battery pack to a powered device;
fig. 4 is a schematic diagram of the connection of the detection module and the cell unit in the battery pack;
FIG. 5 is a flow diagram of a battery pack detection method of an embodiment;
FIG. 6 is a flow diagram of a battery pack detection method according to another embodiment;
fig. 7 is a flow chart of a battery pack detection method according to another embodiment.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Referring to fig. 1 to 3, the battery pack 100 mainly includes: the electric core group 11, the terminal module 12, the temperature module 13, the voltage detection module 14, the communication module 15 and the controller 16 for controlling them.
The electric core group 11 includes: more than one series unit 111. When the number of the series units 111 is more than or equal to 2, different series units 111 are connected in series, and the whole formed by the series units 111 is the electric core group 11.
A series unit 111 comprises: more than one cell. When the number of the battery cells in the same series unit 111 is greater than or equal to 2, different battery cells are connected in parallel to form a series unit 111. As an embodiment, as shown in fig. 2, one series unit 111 includes two cells connected in parallel.
The terminal module 12 is electrically connected to the electric core assembly 11 and the controller 16, and is provided with a positive terminal of the battery pack 100 and a negative terminal of the battery pack 100 for connecting with the outside to transmit electric energy or signals. When the battery pack 100 supplies power to the power consumption device 200, the terminal module 12 makes the cells in the cell pack 11 in a discharge state, and can also supply power to other modules and components inside the battery pack 100.
The temperature module 13 includes: a temperature measuring element 131 and a temperature signal module 132, wherein the temperature measuring element 131 is used for detecting the internal temperature of the battery pack 100. The temperature measuring element 131 is disposed inside the battery pack 100 at a position close to the battery cell, so that it can detect a change in the temperature of the battery cell. In particular, the temperature measuring element 131 can be a thermistor, such as an NTC thermistor.
The temperature signal module 132 is electrically connected to the temperature measuring element 131 and the controller 16, and can transmit the detection result of the temperature measuring element 131 to the controller 16 and be controlled by the controller 16. The temperature signal module 132 is provided with a temperature terminal T of the battery pack 100 for electrical connection with an external temperature terminal.
The voltage detection module 14 is used for detecting the voltage value of each series unit 111 in the electric core group 11, and the voltage detection module 14 is electrically connected with the electric core group 11 and the controller 16 respectively.
As one embodiment, the voltage detection module detects voltage values of every two series units respectively, that is, every two adjacent series units detect the overall voltage as an overall series unit, and the controller calculates the voltage value of the overall series unit according to the voltage signal of the overall series unit detected by the voltage detection module, so as to monitor the battery pack.
The voltage detection module 14 detects the voltage signal in the cell group 11 and transmits the voltage signal to the controller 16, and the controller 16 calculates the voltage value of each series unit 111 according to the voltage signal input by the voltage detection module 14, so as to monitor the voltage safety of the battery pack 100.
The battery pack 100 and the communication module 15 are used for exchanging data or signals and are electrically connected with the controller 16. The communication module 15 of the battery pack 100 can realize data transmission by adopting a hardware connection or a wireless connection. Since the battery pack 100 has high voltage and output power, the reliability and safety are required when it is connected to the electric device 200.
As shown in fig. 1 to 3, as one embodiment, the battery pack 100 and the electric device 200 are connected by hardware to transmit electric energy and data. The communication module 15 is provided with a communication terminal D. The communication terminal D can be physically connected to a corresponding terminal in the power tool when the battery pack 100 is assembled with the power tool.
The controller 16 is mainly used to implement functions such as logic operation and process control. It can control each subassembly and module in battery package 100, guarantees the safety when battery package 100 charges, discharges.
The voltage detection module 14 is mainly described below. The voltage detection module 14 is mainly used for respectively detecting voltage signals at the high-voltage ends of the series units 111. Specifically, the voltage detection module 14 includes a detection circuit 143, and one end of the detection circuit 143 is connected to the high-voltage end of the series unit 111, and the other end is connected to the controller 16.
To implement the detection for the plurality of series units 111, the voltage detection module 14 further includes a time sharing module 146. The time sharing module 146 is used to control the detection circuit 143, and at least can control the detection circuit 143 to switch off its two ends or switch on its two ends.
Referring to fig. 2, a plurality of detection circuits 143 are connected and then connected to the controller 16 through the same line. The plurality of detection circuits 143 connected together serve as one detection group 141, and the plurality of detection circuits 143 in one detection group 141 transmit the acquired voltage signals to the controller 16 through the same bus under the control of the same time sharing module 146. The time-sharing module 146 is electrically connected to the controller 16, and the controller 16 can control the time-sharing module 146 to indirectly control the time-sharing conduction of the plurality of detection circuits 143.
The cell group 11 generally includes a plurality of series-connected cells 111, and the voltage detection module 14 includes a plurality of detection circuits 143 for overall detection. The controller 16 receives voltage signals from the plurality of detection circuits 143 at the same time.
Further, the detecting circuit 143 includes a switching element 144, and the switching element 144 includes two connecting terminals and a control terminal (not shown), wherein the two connecting terminals are: to the detection terminal 144a of the series unit 111 and to an output terminal for connection to the controller 16. The control terminal receives the signal of the time-sharing module 146 and controls the connection or disconnection of the two connection terminals of the on-off element.
Referring to fig. 2, the switching elements 144 in the detection circuits 143 in the same detection group 141 are finally connected to the same place and then to the controller 16.
The detection circuit 143 further includes a voltage dividing resistor 145, and the voltage dividing resistor 145 may be connected to the output terminal 144b of the on-off element 144 as shown in fig. 2, or may be connected to the detection terminal 144a of the on-off element 144.
The control process of the controller 16 when the battery pack 100 supplies power to the electric device 200 is specifically described below with reference to fig. 1 and 2.
Referring to fig. 2, the cells in the cell group 11 continuously discharge outwards when the battery pack 100 discharges, and each series unit 111 may have a condition of uneven discharge, and in order to ensure the electrical safety during the discharging process of the battery pack 100 to avoid the cells from being over-discharged, an under-voltage threshold value for preventing the voltage from being over-discharged is stored in the controller 16.
Specifically, the voltage detection module 14 detects the voltage signal of each series unit 111, and the controller 16 receives the voltage signal of each series unit 111 detected by the voltage detection module 14, compares the voltage signal of each series unit 111 with the under-voltage threshold, and disconnects the electrical connection between the battery pack 100 and the electric device 200 when the voltage value of one of the series units 111 exceeds the under-voltage threshold.
In order to cut off the electrical connection between the battery pack 100 and the electric device 200, the terminal module 12 further includes a switch unit electrically connected to the controller 16, and when the voltage value of one of the series units 111 exceeds the voltage threshold, the controller 16 outputs a control signal for disconnecting the switch unit, so as to disconnect the battery pack 100 from the electric tool, and further prevent the battery pack 100 from discharging to the outside, thereby ensuring the power safety of the battery pack 100.
When the voltage value of the series unit 111 does not exceed the undervoltage threshold, the series unit 111 in the battery pack 100 includes at least two parallel battery cells, and when the two battery cells are unbalanced in discharge, because the battery cells are connected in parallel, when one of the battery cells is over-discharged, the voltage of the series unit 111 detected by the voltage detection module 14 is substantially kept unchanged in a short time. The battery pack 100 continues to discharge, so that the battery cells in the series unit 111 are damaged by hazards such as backflow, and the like, and the battery cells which are originally over-discharged are damaged.
Referring to fig. 4, the voltage detection module detects voltages of each two core units, and the controller 16 is further configured to calculate a voltage difference of the voltage signals of each series unit 111 two by two within a preset time, and if the voltage difference exceeds the preset difference, the controller 16 outputs a control signal for increasing the under-voltage threshold.
Referring to fig. 5, a discharging method for the battery pack 100 includes the steps of:
s401, detecting the voltage value Ui of each series unit 111;
s402, judging whether the voltage value Ui of each series unit 111 is larger than an undervoltage threshold value U1; if yes, go to step S403; otherwise, go to step S407;
s403, calculating a voltage difference value delta Ui between each series unit 111;
s404, comparing the voltage difference values to obtain a maximum voltage difference value delta Umax;
s405, judging whether the maximum voltage difference value is larger than a preset difference value, if so, continuing to execute S406; if not, returning to the step S402;
s406, increasing the undervoltage threshold value, and continuing to execute the step S402;
and S407, disconnecting the electrical connection between the battery pack and the electric tool.
Another discharging method for the battery pack 100 shown with reference to fig. 6 includes the steps of:
s501, detecting the voltage value Ui of each series unit 111;
s502, judging whether the voltage value Ui of each series unit 111 is larger than an undervoltage threshold value U1; if yes, go to step S503; otherwise go to step S508;
s503, calculating a voltage difference value delta Ui of the series unit 111 within preset time;
s504, comparing the voltage difference values to obtain a maximum voltage difference value delta Umax;
s505, judging whether the maximum voltage difference value delta Umax is larger than a preset difference value, if so, continuing to execute S506; if not, returning to S502;
s506, increasing the undervoltage threshold value, and continuing to execute the step S507;
s507, reducing the preset time, and continuing to execute the step S502;
s508, the electrical connection between the battery pack 100 and the power tool is disconnected.
The difference between this embodiment and the embodiment shown in fig. 5 is that a voltage difference value of the series unit 111 within a preset time is calculated, and when the maximum voltage difference value Δ Umax is greater than the preset difference value, the undervoltage threshold is increased and then the preset time is decreased, so that the detection of the overdischarge cell in the series unit 111 is further facilitated, and the frequency of cell damage is reduced.
Note that detecting the voltage value Ui of each series cell 111 in step S501 includes detecting and calculating the voltage value Ui of each series cell 111. It is possible to detect and calculate the voltage value Ui of each series unit 111 within a preset time.
Still another control method for a battery pack 100 shown with reference to fig. 7 includes the steps of:
s601, detecting a voltage value Ui of each series unit 111;
s602, judging whether the voltage value Ui of each series unit 111 is smaller than an undervoltage threshold value U1; if yes, go to step S503; otherwise go to step S607;
s603, calculating a voltage difference value delta Ui of the series unit 111 in preset time;
s604, comparing the voltage difference values to obtain a maximum voltage difference value delta Umax;
s605, judging whether the maximum voltage difference value delta Umax is larger than a preset difference value, if so, continuing to execute S606; if not, returning to the S602;
s606, increasing the undervoltage threshold value and reducing the preset time;
s607, the electrical connection between the battery pack 100 and the electric device 200 is disconnected.
The difference between this embodiment and the embodiment shown in fig. 6 is that in step S606, the under-voltage threshold is simultaneously increased, and the preset time is reduced. Therefore, the detection efficiency of detecting whether the battery core is over-discharged can be further improved, and the battery pack 100 is protected. Possibly, the preset time may be a filtering time.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (9)
1. A battery pack adapted for use with a cordless power tool, comprising:
more than one series units connected in series with each other; the series unit comprises two parallel battery cores;
the voltage detection module is used for respectively detecting the voltages of the plurality of series units;
controller of
And receiving the voltage detected by the voltage detection module, calculating a voltage difference value between every two series units in a preset time, and increasing the undervoltage threshold of the battery pack when the voltage difference value exceeds the preset difference value, wherein the preset time is filtering time.
2. The battery pack according to claim 1,
the controller calculates a voltage difference value between the series units within the preset time, the voltage difference value being a maximum value of voltage difference values between the plurality of series units.
3. The battery pack according to claim 2,
the controller reduces the preset time when the voltage difference exceeds the preset difference.
4. The battery pack according to claim 1,
the controller compares the voltage of the series units with the undervoltage threshold before calculating a voltage difference between the series units within the preset time.
5. A method of testing a battery pack adapted for use in a cordless power tool, the battery pack including one or more series units connected in series with each other, the series unit including two cells connected in parallel, the method comprising:
detecting a voltage of the series unit;
calculating a voltage difference value between every two series units within preset time;
and when the voltage difference value exceeds a preset difference value, improving the undervoltage threshold value of the battery pack, wherein the preset time is filtering time.
6. The detection method according to claim 5,
the voltage difference value is a maximum voltage value among voltage difference values between a plurality of the series units.
7. The detection method according to claim 5,
and reducing the preset time when the voltage difference value exceeds a preset difference value.
8. The detection method according to claim 5,
further comprising:
and comparing the voltage value of the series unit with the undervoltage threshold value.
9. The detection method according to claim 5,
further comprising:
comparing the voltage value of the series unit with the undervoltage threshold value;
and if the voltage difference value is larger than the undervoltage threshold value, calculating the voltage difference value of the series unit within preset time.
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| CN201710654063.2A CN109390983B (en) | 2017-08-03 | 2017-08-03 | Battery pack and detection method for battery pack |
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| CN201710654063.2A CN109390983B (en) | 2017-08-03 | 2017-08-03 | Battery pack and detection method for battery pack |
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| US6859014B2 (en) * | 2002-12-17 | 2005-02-22 | Motorola, Inc. | Method for rapid charge control in lithium batteries |
| CN100454711C (en) * | 2003-07-29 | 2009-01-21 | 华为技术有限公司 | Protecting method and apparatus for battery undervoltage |
| KR101016899B1 (en) * | 2008-06-03 | 2011-02-22 | 삼성에스디아이 주식회사 | Battery pack and method of charge thereof |
| FR2941102B1 (en) * | 2009-01-12 | 2016-04-15 | Valeo Equip Electr Moteur | METHOD FOR CONTROLLING AN ENERGY STORAGE UNIT IN A MICRO-HYBRID SYSTEM FOR A VEHICLE |
| CN102427258A (en) * | 2011-12-02 | 2012-04-25 | 苏州冠硕新能源有限公司 | Battery management system |
| JP6024596B2 (en) * | 2013-05-28 | 2016-11-16 | 株式会社デンソー | Drive element protection circuit and load drive device |
| CN104425852A (en) * | 2013-09-06 | 2015-03-18 | 苏州宝时得电动工具有限公司 | Control method, control assembly, battery system and electric tool |
| CN104135047B (en) * | 2014-07-16 | 2016-08-03 | 国家电网公司 | The active-passive of series-connected batteries works in coordination with mixed equilibrium circuit and equalization methods |
| CN104600801A (en) * | 2015-01-16 | 2015-05-06 | 荆延杰 | Charging and discharging balancing circuit and method of series battery pack |
| CN106299497A (en) * | 2015-06-02 | 2017-01-04 | 南京德朔实业有限公司 | Electric tool and the communicating control method of battery bag |
| CN107139747A (en) * | 2017-05-15 | 2017-09-08 | 南昌大学 | Electric automobile |
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Address after: 211106 No. 529, 159, Jiangjun Avenue, Jiangning District, Nanjing, Jiangsu Province Patentee after: Nanjing Quanfeng Technology Co.,Ltd. Address before: 211106, No. 159, general road, Jiangning economic and Technological Development Zone, Nanjing, Jiangsu Patentee before: NANJING CHERVON INDUSTRY Co.,Ltd. |