CN102130471A - Combination of electric power tool and battery pack - Google Patents
Combination of electric power tool and battery pack Download PDFInfo
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- CN102130471A CN102130471A CN2010100033789A CN201010003378A CN102130471A CN 102130471 A CN102130471 A CN 102130471A CN 2010100033789 A CN2010100033789 A CN 2010100033789A CN 201010003378 A CN201010003378 A CN 201010003378A CN 102130471 A CN102130471 A CN 102130471A
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- power brick
- signal
- checkout gear
- electric tool
- temperature
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Abstract
The invention discloses a combination of an electric power tool and a battery pack, which comprises an electric power tool and a battery pack, wherein the battery pack comprises a first detection device and a second detection device; the electric power tool is internally provided with a control device, the first detection device and the second detection device are respectively used for detecting voltage of a single battery in the battery pack and temperature of the battery pack, the signal of the first detection device is primarily processed in the battery pack and then transmitted to the control device in the electric power tool through one conductive terminal; the signal of the second detection device is not pressed in the battery pack and directly transmitted to the control device in the electric power tool through another conductive terminal; and the control device is used for realizing over-discharge protection on the battery pack according to the signals of the first detection device and the second detection device. According to the design, the structure of the battery pack can be simplified and the design cost of the battery pack is lowered.
Description
Technical field
The present invention relates to the combination of a kind of electric tool and power brick.
Background technology
In recent years, along with the development of battery material technology, the capacity of battery is significantly promoted, and its range of application also extends to some powerful power category electric devices from some low power electrical type electric devices, as electric tool etc.Like this, adopted the electric tool of high-multiplying-power battery can break away from cable constraint and can be at any time, use everywhere.For increasing operation rate, what these batteries adopted usually is rechargeable battery, as NI-G (Nickel-cadmium, NiCd) battery, ni-mh (Nickel-Metal Hydride, NiMH) battery, lithium ion (Lithium-ion, L-ion) battery etc.
The battery of the above-mentioned type is with wireless class electric device cooperating the time, be to be in a discharge condition, during battery discharge, when voltage drops to the minimum operational voltage value (final voltage) that battery should not continue to discharge again, also continuing discharge just may cause inner pressure of battery to raise, the invertibity of positive and negative electrode active material is damaged, thereby can make the capacity of battery produce obviously minimizing.Therefore, when these wireless class electric devices designs, all can consider to adopt combining power brick being carried out putting protection of hardware or hardware and software, but itself designing requirement and design and manufacturing cost are all very high usually.
Described a kind of rechargeable battery unit among US 7270910 B2, can be connected to, provide electric energy this device by battery-driven electric device.In battery unit, be provided with testing circuit and control circuit, testing circuit is used to detect the discharging current of battery unit and the temperature of power brick, checkout gear sends detected electric current or temperature signal to control device, control device is controlled power brick providing the electric device electric energy according to these two electric signals.In this scheme, both comprised checkout gear in the power brick, comprise control device simultaneously, the wiring board that promptly is arranged in the power brick not only has measuring ability, have the function that discharge is controlled to power brick simultaneously, thus the project organization complexity of power brick, the design cost height of power brick.
The combination of a kind of electric tool and power brick has been described among CN 100340045 C, wherein power brick has a checkout gear, this checkout gear is used to detect at least one running parameter of power brick, as discharging current, power brick temperature, cell voltage etc., electric tool has a control device, and this control device is according to the discharge of the detection signal control power brick of being exported by the checkout gear of power brick.In this scheme, the control device that has the checkout gear of measuring ability and have a controlled function is arranged at respectively in power brick and the electric tool, the checkout gear that only has measuring ability in the power brick, all be arranged on scheme in the power brick compared to checkout gear and control device, the design of this scheme power brick is obviously simplified, and the design cost of power brick decreases.But in this scheme, the detected signal of all checkout gears all needs to carry out preliminary treatment in power brick, and then flow to control device by a unified signal port, increased the signal processing design of detection signal in power brick thus, the project organization of power brick is comparatively complicated, and design cost is also higher.
In such scheme, the project organization of power brick is all comparatively complicated, design cost is also corresponding higher, and in the production marketing process, project organization complexity, the design cost height of power brick be generally two power brick of an electric tool configuration, if will inevitably increase overall cost, therefore need a kind of project organization simpler, the power brick that cost is cheaper.
Summary of the invention
The invention provides the combination of a kind of electric tool and power brick, the project organization of power brick is further simplified, and design cost further reduces.
For achieving the above object, technical scheme of the present invention is:
The combination of a kind of electric tool and power brick comprises:
Power brick, it comprises:
Housing,
Some batteries are housed in the described housing,
First checkout gear electrically connects with described battery, and be used to detect the voltage of single battery, and correspondingly generate status signal,
Second checkout gear is arranged in the described housing, is used to detect the temperature of described power brick, and correspondingly generates temperature signal,
Some first conducting terminals are arranged on the described housing,
Electric tool, it comprises:
Casing,
Motor is arranged in the described casing,
Control device is used to receive described status signal and temperature signal, and according to described state or temperature signal, controls the running of described motor,
Some second conducting terminals electrically connect with described control device, are arranged on the described casing,
Wherein, described some first conducting terminals comprise first state indication terminal that electrically connects with described first checkout gear and first temperature indication terminal that electrically connects with described second checkout gear, and described some second conducting terminals comprise second state indication terminal that electrically connects with described first state indication terminal and second temperature indication terminal that electrically connects with described first temperature indication terminal.
Preferably, when described power brick temperature was higher than preset temperature value, described control device cut off the electric current that described power brick flows to described motor.Preferably, described preset temperature value is 65 ℃.
Preferably, described status signal comprises state normal signal or abnormal state signal, when described control device receives the abnormal state signal, cuts off the electric current that described power brick flows to described motor.
Preferably, when the voltage of any batteries was lower than the predeterminated voltage value in the described power brick, described first checkout gear generated the abnormal state signal.Preferably, the predeterminated voltage value is 80% of a single battery rated voltage.
Preferably, described first checkout gear comprises processor.Preferably, described control device comprises switching transistor, when described control device is controlled described switching transistor and disconnected, cuts off the electric current that described power brick flows to described motor.
Compared with prior art; in power brick and electric tool, be equipped with Electronic Control Unit among the present invention; can be used for monitoring the power brick state respectively and power brick is carried out protection control; and the checkout gear branch in the power brick is arranged; the detection signal of part checkout gear carries out preliminary treatment in power brick; the detection signal of part checkout gear is not done any processing in power brick; detect all schemes of preliminary treatment in power brick with respect to all; this designing requirement further is simplified comparatively speaking, and cost also correspondingly reduces simultaneously.
Description of drawings
The invention will be further described below in conjunction with drawings and embodiments.
Fig. 1 is that power brick is plugged into the circuit block diagram of working behind the electric tool in the specific embodiment of the invention.
Fig. 2 is the workflow block diagram of power brick in the specific embodiment of the invention.
Fig. 3 is the workflow block diagram that electric tool realized putting protection in the specific embodiment of the invention to power brick.
Embodiment
The present invention is intended to disclose a kind of new power brick and crosses the protected mode of putting; cooperating by wireless electric device and power brick common and to avoid power brick to cross putting, below is that example describes embodiment in conjunction with Fig. 1 to Fig. 3 with lithium ion battery bag and cordless power tool.Need to prove, the lithium ion battery bag is a preferred embodiment, except that the lithium ion battery bag, also can be ni-mh (Ni-MH) or NI-G (Ni-Cd) power brick, here said lithium ion battery is that negative material is the general name of the rechargeable battery of elemental lithium simultaneously, and according to the difference of positive electrode, it can constitute many systems, as " lithium manganese " battery, " lithium iron " battery etc.
Fig. 1 is the schematic block circuit diagram that power brick 10 is plugged into electric tool 20 back work.Those of ordinary skill in the art is understandable to be, all be provided with printed circuit board (PCB) in power brick 10, the electric tool 20, and the Electronic Control Unit of being made up of plurality of electronic elements shown in the figure is arranged on the related circuit plate, and by the circuit on the circuit board these electronic devices and components is electrically connected mutually.
As shown in Figure 1, power brick 10 includes battery pack 11, first checkout gear 12, second checkout gear 13 and the plurality of conductive terminals.
In the present embodiment, battery pack 11 is made up of the lithium ion battery 11 of five joint series connection, and wherein the rated voltage of every batteries is 3.6 volts (V).Certainly, in other embodiments, according to different operating mode demands, the also visual concrete condition of cell types, joint number and set-up mode and difference.As battery pack 11 can be that 3.2 volts lithium Fe battery is formed by ten joint rated voltages, and this ten batteries divides two to arrange and be set up in parallel, and every row is in series by five batteries.In addition, because the characteristic difference of battery, its corresponding discharge voltage lower limit V1, discharge temp upper limit T1 can be corresponding different.
In the present embodiment, second checkout gear 13 is a thermistor, it is adhered to the surface of battery, preferred embodiment, second checkout gear 13 is set at the highest zone of temperature in the battery pack 11, can guarantee that like this all batteries can not be damaged because of excess temperature, and, the zone that second checkout gear 13 is provided with preferably completely cuts off with outer gas stream, and the temperature value that so can guarantee to detect battery pack 11 is more accurate.By this set, when the temperature of battery changed, the resistance of second checkout gear 13 is also corresponding to change, and by conducting terminal this variations in temperature is passed to electric tool 20.
In the present embodiment, the conducting terminal of power brick 10 comprises first positive terminal (B+) 15 and first negative terminal (B-) 19 with the corresponding electric connection of positive and negative electrode of battery pack 11, first power supply terminal (Vcc) 16 that is connected with the respective input mouth of power brick first checkout gear 12, be connected first state indication terminal (BH) 17 that is used for exporting expression power brick operating state index signal with the corresponding output end mouth of power brick first checkout gear 12, and indicate terminal (NTC) 18 with first temperature that second checkout gear 13 electrically connects.
As shown in Figure 1, electric tool 20 comprises motor 21, motor control unit 22, DC power supply modular converter (DC-DC) 24, motor control switch 201, trigger 202 and plurality of conductive terminals.
Wherein, the conducting terminal of electric tool 20 comprises second positive terminal (B+) 25 that electrically contacts with first positive terminal (B+) 15 of power brick 10, first negative terminal (B-), 19 electrical second negative terminals (B-) 29 that contact with power brick 10, first power supply terminal (Vcc), the 16 electrical second source terminals (Vcc) 26 that contact with power brick 10, indicate terminal (BH) 27 with second state that first state indication terminal (BH) 17 of power brick 10 electrically contacts, and indicate terminal (NTC) 18 electrical second temperature indication terminals (NTC) 28 that contact with first temperature of power brick 10.
In the present embodiment, motor control unit 22 is connected with second state indication terminal (BH) 27 and second temperature indication terminal (NTC) 28, is used to control the running of motor 21.The logical circuit that motor control unit 22 can be made up of the components and parts of realizing each corresponding function also can be the microprocessor of the program of being integrated with, instruction.In the present embodiment, motor control unit 22 is a logical circuit.Motor control unit 22 obtains the status signal of first checkout gear, 12 detected power brick 10 by second state indication terminal 27, first state indication terminal 17, and obtains the temperature signal of second checkout gear, 13 detected power brick 10 by second state indication terminal 28, first state indication terminal 18.Motor control unit 22 is by the running of the power brick status signal that receives and temperature signal control motor 21.
In the present embodiment, DC power supply modular converter 24 is DC-DC modular converters, low pressure and galvanic current source that the motor control unit 22 that is used for being converted to first checkout gear 12 for power brick 10, electric tool 20 from the high pressure of battery pack 11 and unsettled DC power supply uses.This DC power supply modular converter 24 is arranged between second positive terminal 25 and second negative terminal 29, and between second positive terminal 25 and DC power supply modular converter 24, be provided with a trigger 202, but these trigger 202 staff are arranged on operatively on the electric tool 20.After power brick 10 and electric tool 20 were pegged graft, pressed trigger 202, power transfer module 24 can be formed electrical loop with battery pack 11.Power transfer module 24 obtains high pressure and unsettled DC power supply through trigger 202, second positive terminal 25 and first positive terminal 15 from battery pack 11, after power transfer module 24 conversions, become low pressure galvanic current source, this low pressure galvanic current source provides electric power for motor control assembly 22 through the electric connection of electric tool 20 inside, electric power is provided for first checkout gear 12 in the power brick 10 through the second source terminal 26 and first power supply terminal 16 simultaneously.This in the present embodiment, though provide electric power by battery pack for the electronic devices and components in power brick and the electric tool, but power brick need be plugged into electric tool and start working (trigger 202 closes) after, this electric power just can be supplied.That is to say, power brick is under storage (not pegging graft) or standby (trigger 202 is not closed) state, electronic devices and components in power brick and the electric tool can not obtain supply of electric power, thereby effectively avoid the electronic devices and components in power brick and the electric tool unnecessarily to consume electric power.
Also be provided with a motor control switch 201 in the electric tool 20, the setting of connecting with motor 21 of this motor control switch 201, and electrically connect with motor control unit 22.Motor control unit 22 is optionally controlled opening or turn-offing of motor control switch 201 according to the state of battery pack 11.Equally, motor control switch 201 also can adopt semiconductor switch well-known to those skilled in the art, as adopt MOSFET (Metallic Oxide Semiconductor Field Effecttransistor, the mos field effect transistor metal-oxide semiconductor (MOS)), can control the operation of motor 21 so effectively by the characteristic of MOSFET high frequency break-make.
Describe in detail below in conjunction with Fig. 2 and Fig. 3, electric tool is put the protection process with realizing the mistake of power brick in discharge process cooperating of power brick.
When power brick 10 be plugged on the electric tool 20 and closed trigger 202 after, the electric current of battery pack 11 is delivered to trigger 202 through first, second positive terminal (B+), pass to dc constant voltage power supply 24 through trigger 202 again, dc constant voltage power supply 24 is started working subsequently.The power supply of battery pack 11 is given first checkout gear 12 in the power brick 10 by second source terminal 26, first power supply terminal 16 with current delivery successively after dc constant voltage power supply 24 conversion, circuit through electric tool 20 inside passes to motor control unit 22 simultaneously, thereby first checkout gear 12 and motor control unit 22 are started working.
As shown in Figure 2, first checkout gear 12 is started working after (step 401), detects and obtain the magnitude of voltage Vc (step 402) of every batteries in the battery pack 10.Subsequently, first checkout gear 12 judges further whether the voltage Vc of battery is in the normal range (NR) under the discharge condition.At first, judge that whether cell voltage Vc is smaller or equal to discharge voltage lower limit V1 (step 405).Because the consistency of each battery may not be fine in the battery pack 11, so each cell voltage Vc may not be identical, therefore in the present embodiment, for guaranteeing reliability, get wherein minimum magnitude of voltage and compare, can guarantee that so all batteries can not produce the situation of putting.Generally speaking, V 1 is set to be lower than 80% of single battery rated voltage, in the present embodiment, because what adopt is the battery of lithium manganese characteristic, discharge voltage lower limit V1 gets and is lower than 80% of lithium-manganese cell rated voltage 3.6V, promptly is lower than 2.88V, and preferably getting V1 is 2.5 volts (V).When judging Vc≤2.5V, show that power brick had reached the state of putting, at this moment, set BH port is a low level (step 411), promptly to output to the signal of first state indication terminal (BH) 17 be low level signal to first checkout gear 12, and the operating state of expression current battery bag is in unusually; When judging Vc＞2.5V, showing that power brick is also crossed puts, so, set BH port is a high level signal (step 407), promptly to output to the signal of first state indication terminal (BH) 17 be high level signal to first checkout gear 12, the operating state of expression current battery bag is in normally, then, returns the cycle criterion that step 405 is carried out single battery voltage.Need to prove that also can represent that the power brick operating state is unusual with high level signal, low level signal represents that the power brick operating state is normal.
As shown in Figure 3, motor control unit 22 is started working after (step 501), detect BH port signal (step 502), promptly obtain the condition indicative signal of the power brick 10 of first checkout gear, 12 outputs by second state indication terminal (BH) 27, first state indication terminal (BH) 17.Change next step immediately over to, judge that the BH signal is high level signal or low level signal (step 503).If judge it is low level signal, then go to step 507 and disconnect discharge loop, promptly motor control unit 22 control motor control switch 201 are in off-state, and motor 21 quits work.When judging that the BH port signal is high level signal; motor control unit 22 just further detects battery temperature Tb (step 504); and whether the working temperature of judging battery pack 11 is too high; generally speaking; temperature in the power brick discharge process reaches 65 ℃ and thinks that promptly battery temperature is too high, needs protection, for making full use of the energy of battery; in the present embodiment, be limited to 75 ℃ on the power brick working temperature.Motor control unit 22 according to 75 ℃ of temperature of judging power brick 10 setting whether greater than 75 ℃ (step 505).When judging Tb＞75 ℃, show that battery pack 11 working temperatures are too high, then go to step 507 and disconnect discharge loop, promptly motor control unit 22 control motor control switch 201 are in off-state, and motor 21 quits work; When judging Tb≤75 ℃, show that battery pack 11 working temperatures are in normal range (NR), then go to step 506 and connect discharge loop, be that motor control unit 22 control motor control switch 201 are in closure state, thereby, motor 21 begins to run well, the work-based logic of motor control unit 22 goes to step 502 simultaneously, the condition indicative signal and the temperature indication signal of beginning cycle detection power brick, in case the abnormal conditions of above-mentioned any state or temperature occur, promptly be in off-state, thereby control motor 21 quits work by motor control assembly 22 control motor control switch 201.
Among the present invention, power brick 10 detects voltage and temperature by two checkout gears respectively, be the complexity of avoiding being connected with electric tool 20, the detection signal of first checkout gear 12 passes to electric tool 20 after preliminary signal processing is carried out in power brick 10 inside; And the signal of second checkout gear 13 is considered and is simplified the power brick structure, reduces the power brick cost, does not do any processing in power brick 10, directly signal is passed to electric tool 20.Electric tool 20 is carried out control corresponding according to the signal of this first checkout gear 12 and second checkout gear 13.By this set, both can effectively protect battery, reduced simultaneously power brick and design and manufacturing cost.
Claims (8)
1. the combination of electric tool and power brick comprises:
Power brick, it comprises:
Housing,
Some batteries are housed in the described housing,
First checkout gear electrically connects with described battery, and be used to detect the voltage of single battery, and correspondingly generate status signal,
Second checkout gear is arranged in the described housing, is used to detect the temperature of described power brick, and correspondingly generates temperature signal,
Some first conducting terminals are arranged on the described housing,
Electric tool, it comprises:
Casing,
Motor is arranged in the described casing,
Control device is used to receive described status signal and temperature signal, and according to described state or temperature signal, controls the running of described motor,
Some second conducting terminals electrically connect with described control device, are arranged on the described casing,
It is characterized in that: described some first conducting terminals comprise first state indication terminal that electrically connects with described first checkout gear and first temperature indication terminal that electrically connects with described second checkout gear, and described some second conducting terminals comprise second state indication terminal that electrically connects with described first state indication terminal and second temperature indication terminal that electrically connects with described first temperature indication terminal.
2. the combination of electric tool according to claim 1 and power brick is characterized in that: when described power brick temperature was higher than preset temperature value, described control device cut off the electric current that described power brick flows to described motor.
3. the combination of electric tool according to claim 2 and power brick is characterized in that: described preset temperature value is 65 ℃.
4. the combination of electric tool according to claim 1 and power brick, it is characterized in that: described status signal comprises state normal signal or abnormal state signal, when described control device receives the abnormal state signal, cut off the electric current that described power brick flows to described motor.
5. the combination of electric tool according to claim 4 and power brick is characterized in that: when the voltage of any batteries was lower than the predeterminated voltage value in the described power brick, described first checkout gear generated the abnormal state signal.
6. the combination of electric tool according to claim 5 and power brick is characterized in that: the predeterminated voltage value is 80% of a single battery rated voltage.
7. the combination of electric tool according to claim 6 and power brick is characterized in that: described first checkout gear comprises processor.
8. according to the combination of claim 3 or 7 described electric tools and power brick, it is characterized in that: described control device comprises switching transistor, when described control device is controlled described switching transistor and disconnected, cuts off the electric current that described power brick flows to described motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100033789A CN102130471A (en) | 2010-01-16 | 2010-01-16 | Combination of electric power tool and battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100033789A CN102130471A (en) | 2010-01-16 | 2010-01-16 | Combination of electric power tool and battery pack |
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| CN102130471A true CN102130471A (en) | 2011-07-20 |
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| CN2010100033789A Pending CN102130471A (en) | 2010-01-16 | 2010-01-16 | Combination of electric power tool and battery pack |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108400629A (en) * | 2014-05-18 | 2018-08-14 | 百得有限公司 | Battery pack |
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| JPH1138104A (en) * | 1997-07-15 | 1999-02-12 | Mitsubishi Electric Corp | Residual capacity detecting device for battery |
| CN101051757A (en) * | 2006-02-27 | 2007-10-10 | 松下电工株式会社 | Charging apparatus |
| CN201266847Y (en) * | 2008-09-01 | 2009-07-01 | 苏州宝时得电动工具有限公司 | Battery bag and combination of battery bag and electrical device |
| CN201609889U (en) * | 2010-01-16 | 2010-10-20 | 苏州宝时得电动工具有限公司 | Combination of electric tool and battery pack |
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2010
- 2010-01-16 CN CN2010100033789A patent/CN102130471A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1138104A (en) * | 1997-07-15 | 1999-02-12 | Mitsubishi Electric Corp | Residual capacity detecting device for battery |
| CN101051757A (en) * | 2006-02-27 | 2007-10-10 | 松下电工株式会社 | Charging apparatus |
| CN201266847Y (en) * | 2008-09-01 | 2009-07-01 | 苏州宝时得电动工具有限公司 | Battery bag and combination of battery bag and electrical device |
| CN201609889U (en) * | 2010-01-16 | 2010-10-20 | 苏州宝时得电动工具有限公司 | Combination of electric tool and battery pack |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108400629A (en) * | 2014-05-18 | 2018-08-14 | 百得有限公司 | Battery pack |
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Application publication date: 20110720 |