CN207021730U - A kind of electric tool - Google Patents
A kind of electric tool Download PDFInfo
- Publication number
- CN207021730U CN207021730U CN201720859505.2U CN201720859505U CN207021730U CN 207021730 U CN207021730 U CN 207021730U CN 201720859505 U CN201720859505 U CN 201720859505U CN 207021730 U CN207021730 U CN 207021730U
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- battery pack
- microswitch
- battery
- control unit
- electric tool
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Abstract
A kind of electric tool, include battery pack assembly and control unit, it is characterised in that：Battery pack assembly includes the battery pack of voltage identical first and the second battery pack, has normally closed first microswitch between the first battery pack and the positive pole of the second battery pack, there is normally closed second microswitch between the first battery pack and the negative pole of the second battery pack；Control unit includes the first terminal, Second terminal, third terminal and forth terminal, also includes the driving part for making the first microswitch and the second microswitch while opening；Control unit output end is powered with the first battery pack and the second battery pack first voltage in parallel obtained or the second voltage obtained of being connected with the first battery pack and the second battery pack to electric tool.The utility model has the advantage of：Control unit itself completes the connection in series-parallel of battery pack, reduces circuit volume, reduces circuit self-heating rate and fault rate；Two normally closed microswitches are set in battery pack assembly, effectively suppresses two Battery pack ports and forms pressure difference, lithium battery is protected and increases the service life.
Description
Technical field
A kind of electric tool is the utility model is related to, more particularly to a kind of electronic work of achievable twin voltage platform conversion
Tool.
Background technology
In the prior art, conventional batteries bag is typically deposited in the form of certain nominal voltage used in cordless power tool
Common battery is surrounded by two kinds of voltage platforms of 18V and 36V.Generally, the electric tool and fill that 18V battery bag can only be with 18V
Electrical equipment, and 36V battery bag can only match somebody with somebody 36V electric tool and charger, because the battery bag of two kinds of voltage is not general so that
In actual use battery bag and the species of charger increase, resource utilization it is not high, also the purchase cost of user can be made substantially to increase
Add.
Then, in order to effectively simplify the species of battery bag and charger, the using flexible of electric tool and portable is improved
Property, how to provide a kind of battery bag of achievable dual output turns into the new direction of electric tool designer research.
At present, the Chinese invention patent application of existing Application No. 201580011830.7《The improvement of compact power》Just
A kind of technical scheme of achievable dual output battery bag is proposed, the technical scheme uses two groups in battery bag
18V battery packs E1 ', E2 ', two kinds of output electricity of 36V and 18V are realized by this two groups of 18V battery packs E1 ', E2 ' connection in series-parallel respectively
Pressure.The realization principle of above-mentioned patent can specifically correspond to circuit theory diagrams as shown in Figure 8, Figure 9, wherein, when two groups of 18V electricity
When 36V output voltages are realized in pond group series connection, K1 ' closures, K2 ' and K3 ' disconnect, referring to Fig. 8；As two groups of 18V battery packs E1 ', E2 '
When 18V output voltages are realized in parallel connection, K1 ' disconnects, K2 ' and K3 ' closures, referring to Fig. 9；During specific implementation, in foregoing circuit
K1 ', K2 ' and K3 ' they are to use switch with mechanical contact or electronic non-contact switch nothing but, according to the realization principle of the patent, these
Switching requirements are both needed to bear the lasting through-flow of dozens of Ann, so peace up to a hundred pulse through-current capability (such as motor load, start or
When generation is short-circuit), it is seen then that either series connection or parallel connection, volume is at least needed using the physical circuit of above-mentioned art solutions
The through-flow control point of high current at outer increase by three so that the switching control of circuit realiration is complicated, cost is high, and so designs
Circuit often volume is larger, circuit self-heating rate and fault rate are high.
In addition, a great potential safety hazard also be present using the technical scheme of above-mentioned patent, due to user's normal use
In battery bag repeated charge, the battery core consumable stood plus protection board existing for internal battery pack from power consumption and for a long time
Electricity so that it is poor that two battery packs in battery bag can produce certain port voltage, when port voltage difference is larger, referring to Fig. 6
(wherein, Va and Vb is the port voltage for representing two battery packs respectively, and I is the current waveform figure after two battery pack parallel connections),
Because the internal resistance of lithium battery is small (being usually milliohm level), two battery packs moment in parallel can be produced into very big mutual charging current
(the high battery pack of port voltage charges to the low battery pack of port voltage), then tends to big multiplying power charging, and electric current becomes with pressure difference
It is small and diminish, until two port voltages are essentially equal.This big multiplying power charging can cause lithium cell charging excessive velocities, not only
So that the service life of lithium battery greatly shortens, and the use to electric tool brings certain potential safety hazard.
Therefore, the technology contents disclosed in above-mentioned patent have been merely given as the electric tool of an achievable dual output
The conceptual solution of power supply, its circuit theory are not appropriate for practical operation and implementation, a variety of as described above ask also be present
Topic, up for making further improve and perfect.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of circuit switching for above-mentioned state of the art
Control is simple, battery is long and safer reliable electric tool.
Technical scheme is used by the utility model solves above-mentioned technical problem：A kind of electric tool, includes battery
Pack assembly and can with the battery pack assembly match somebody with somebody merges to electric tool offer voltage control unit, it is characterised in that：Institute
State battery pack assembly and include the battery pack of voltage identical first and the second battery pack, first battery anode and the second electricity
Electrically connected between the group positive pole of pond and be provided with normally closed first microswitch, first battery electrode and the second battery electrode
Between electrically connect and be provided with normally closed second microswitch；Correspondingly, the control unit includes input and output end, institute
State control unit input include be connected respectively first battery anode, the second battery anode, first electricity
The first terminal, Second terminal, third terminal and the forth terminal of pond group negative pole and the second battery electrode, the control unit it is defeated
Enter end and also include the driving part for causing the first microswitch and the second microswitch while opening；The control unit it is defeated
Go out end with first battery pack and the second battery pack first voltage in parallel obtained or with first battery pack and second
The second voltage that battery pack series connection obtains is powered to the electric tool.
Preferably, first battery pack and the second battery pack include multiple element cells being serially connected respectively,
The voltage of first battery pack and the second battery pack can be selected according to the real work voltage of electric tool, by least
Two or more element cell series connection obtain.
In order to further increase operating voltage, expand the application of electric tool, as further preferred, the battery
Pack assembly can also include three or more than three voltage identical battery packs, in the situation of three or more than three battery packs
Under, the output end of the control unit is still with described three or more than the three battery packs first voltage in parallel obtained or institute
State three or the series connection of more than three battery packs obtain second voltages and powered to the electric tool, now, three or three with
Than two battery pack series connection acquisition second voltages of second voltage of upper battery pack series connection are big, for electric tool in larger work
Make the application scenario of voltage.
Preferably, first microswitch and the second microswitch are separate single connection plane switch, correspondingly, institute
State driving part and include the first actuator and the second actuator, first actuator is matched somebody with somebody with first microswitch and merged
It is open mode to keep first microswitch, second actuator and second microswitch with merge keep this second
Microswitch is open mode.First microswitch and the second microswitch are set independently of each other, can improve the reliable of circuit
Property, the first microswitch is only opened simultaneously and the second microswitch just can guarantee that the normal work of circuit, effectively avoids grasping by mistake
Make and disturb.
In order to facilitate control, and ensure that the first microswitch and the second microswitch remain synchronous open mode, make
To be another preferred, first microswitch and the second microswitch can be the ganged switch mutually to link, correspondingly, described
Driving part includes the 3rd actuator, and the 3rd actuator matches somebody with somebody to merge with the ganged switch keeps the ganged switch to beat
Open state.
Compared with prior art, the utility model has the advantage of：The series-parallel circuit conversion of two battery packs is placed on
To being completed in the control unit of electric tool output services voltage, control unit itself completes the serial or parallel connection of battery pack, this
Kind serial or parallel connection converting circuit structure is more simple, does not increase new switching point or contact point, can reduce circuit volume,
Reduce circuit self-heating rate and fault rate；In addition, two normally closed microswitches are set in battery pack assembly, when battery package
Part is under off working state, can effectively be suppressed two Battery pack ports and be formed pressure difference, so as to ensure two Battery pack port voltages
It is close or equal, avoid port differential pressure from increasing and cause very big mutual charging current, make so as to reach protection lithium battery and extend
With the purpose in life-span；After battery pack assembly inserts control unit, the actuator structure designed on control unit can push up in advance
The microswitch being opened on battery pack assembly, ensure battery bag normal work.
Brief description of the drawings
Fig. 1 is the battery pack parallel circuit structure schematic diagram of the utility model embodiment.
Fig. 2 is the battery pack series circuit configuration schematic diagram of the utility model embodiment.
Fig. 3 is the microswitch fit structure schematic diagram of the utility model embodiment.
Fig. 4 is the microswitch socket structure schematic diagram of the utility model embodiment.
Fig. 5 is the microswitch plug construction schematic diagram of the utility model embodiment.
Fig. 6 is one of two groups of current waveform figures having after the battery pack parallel connection of port differential pressure (port differential pressure is larger).
Fig. 7 is two groups of two (port differential pressure are smaller) with the current waveform figure after the battery pack parallel connection of port differential pressure.
Fig. 8 is the circuit diagram that double cell group of the prior art series connection obtains 36V output voltages.
Fig. 9 is the double cell group of the prior art circuit diagram in parallel for obtaining 18V output voltages.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in Fig. 1~Fig. 5, the electric tool of the present embodiment includes battery pack assembly 1 and control unit 2, wherein, electricity
Pond pack assembly 1 can realize charging/discharging function, and the battery pack assembly 1 includes the electricity of voltage identical the first battery pack E1 and second
Pond group E2, the first battery pack E1 and the second battery pack E2 is the 18V electricity formed by multiple battery cells in series in the present embodiment
Pond group, electrically connected between the first battery anode e11 and the second battery anode e21 and be provided with normally closed first microswitch
K1, electrically connected between the first battery electrode e12 and the second battery electrode e22 and be provided with normally closed second microswitch K2.
The control unit 2 of the present embodiment can match somebody with somebody to merge to electric tool with battery pack assembly 1 provides voltage, control unit 2
Include input and output end, the input of control unit 2, which includes, is connected respectively the first battery anode e11,
Two battery anode e21, the first battery electrode e12 and the second battery electrode e22 the first terminal P1, Second terminal P2,
Third terminal P3 and forth terminal P4, the input of control unit 2 also includes so that the first microswitch K1 and the second fine motion
Switch the driving part that K2 is opened simultaneously.
In the present embodiment, the first microswitch K1 and the second microswitch K2 are separate single connection plane switch, and first is micro-
Dynamic switch K1 is arranged between the first battery anode e11 and the second battery anode e21, and the second microswitch K2 is arranged at the
Between one battery electrode e12 and the second battery electrode e22, correspondingly, driving part includes the first actuator 21 and
Two actuators 22, the first actuator 21 are arranged between the first terminal P1 and Second terminal P2, and the second actuator 22 is arranged at
Between three terminals Ps 3 and forth terminal P4, referring to Fig. 3~Fig. 5, the first actuator 21 coordinates with the first microswitch K1 to be kept
First microswitch K1 is open mode, and the second actuator 22 and the second microswitch K2, which coordinate, can keep second fine motion to open
Pass K2 is open mode, after control unit 2 inserts battery pack assembly 1, the first microswitch K1 and the second microswitch K2 quilts
Open simultaneously；First microswitch K1 and the second microswitch K2 are set independently of each other, can improve the reliability of circuit, only
Open the first microswitch K1 and the second microswitch K2 simultaneously and just can guarantee that the normal work of circuit, effectively avoid maloperation with
Interference.
In order to ensure that the first microswitch K1 and the second microswitch K2 remains synchronous open mode, and convenient control
System and operation, the first microswitch K1 and the second microswitch K2 can also be the ganged switch mutually to link, correspondingly, driving
Part includes the 3rd actuator that can open ganged switch, after control unit 2 inserts battery pack assembly 1, the 3rd actuator
Open ganged switch so that the first microswitch K1 and the second microswitch K2 are simultaneously switched off, and ensure the behaviour of two microswitches
Make synchronism.
The present embodiment battery pack assembly 1 is externally having four pole pieces 11, i.e. the first battery anode e11, the second battery pack just
Pole e21, the first battery electrode e12 and the second battery electrode e22, the input of control unit 2 also have four pole pieces 23, i.e.,
The first terminal P1, Second terminal P2, third terminal P3 and forth terminal P4, all pole pieces use handware, can carry big electricity
Stream；The the first microswitch K1 and the second microswitch K2 of the present embodiment battery pack assembly 1 are in depressible salient point, referring to Fig. 4,
First actuator 21 of control unit 2 and the second actuator are in two projections, referring to Fig. 5, when control unit 2 inserts battery package
In part 1, projection pressure salient point, the first microswitch K1 and the second microswitch K2 are converted to open mode from closure state；Control
The output end of part 2 processed is with the first battery pack E1 and the second battery pack E2 first voltages (18V) in parallel obtained or with first
The second voltage (36V) that battery pack E1 and the second battery pack E2 series connection obtains is powered to electric tool；
Serial-parallel conversion circuit is placed directly in control unit 2 by the present embodiment, and the inside of battery pack assembly 1 is complicated without setting
Switching circuit, when the operating voltage of electric tool is 18V (first voltage), now, the control unit 2 matched with electric tool
Using change-over circuit as shown in Figure 1, the first terminal P1, Second terminal P2, third terminal P3 and the forth terminal of control unit 2
P4 is connected respectively the first battery anode e11, the second battery anode e21, the first battery electrode e12 and the second battery
Group negative pole e22, also, the first terminal P1 and Second terminal P2 of control unit 2 are electrically connected as output end first voltage just
Pole, third terminal P3 and forth terminal P4 electrically connect the negative pole as output end first voltage；
When the operating voltage of electric tool is 36V (second voltage), now, the control unit 2 matched with electric tool
Using change-over circuit as shown in Figure 2, the first terminal P1, Second terminal P2, third terminal P3 and the forth terminal of control unit 2
P4 is connected respectively the first battery anode e11, the second battery anode e21, the first battery electrode e12 and the second battery
Group negative pole e22, also, positive poles of the first terminal P1 of control unit 2 as output end second voltage, the 3rd of control unit 2 the
Negative pole of the terminals P 3 as output end second voltage, Second terminal P2 and forth terminal P4 are joined directly together；Can also be by control unit
Positive poles of the Second terminal P2 of part 2 as output end second voltage, negative poles of the forth terminal P4 as output end second voltage, the
One terminal P1 and third terminal P3 is joined directly together (omission circuit structure), can equally obtain 36V output voltage.
In actual applications, the first battery pack E1 and the second battery pack E2 voltage can be according to the actual works of electric tool
Selected as voltage；The battery pack assembly 1 of the present embodiment provides two outputs using two battery packs by series-parallel system
The mode of voltage, in order to further expand the diversity of output voltage, battery pack assembly 1 can also include three or more than three
Voltage identical battery pack, in the case of three or more than three battery packs, the output end of control unit still with three or
More than three battery packs first voltage in parallel obtained either three or more than three battery packs series connection obtain second voltages to
Electric tool is powered, such as, battery pack assembly 1 uses three 18V battery packs, when three battery bag parallel connections, can obtain 18V's
Output voltage, when three battery bags are connected, then 54V output voltage can be obtained, to meet more than 36V more high current electricians
The requirement of instrument, the series-parallel transition circuit inside control unit is identical with the general principle of the present embodiment, does not make herein
Repeat.
Fig. 6 and Fig. 7 is the current waveform figure after two battery pack parallel connections under different port differential pressure conditions, can be seen
Arrive, in the case that port differential pressure is larger (Va=21V, Vb=12V), two battery pack moments in parallel can produce very big
Mutual charging current I, electric current diminish and diminished with pressure difference, until two port voltages are essentially equal, such case current fluctuation compared with
Greatly, lithium cell charging can be caused too fast, substantially reduces lithium battery service life；And (the Va=in the case of port differential pressure is less
19.1V, Vb=18V), two battery pack immediate currents in parallel are smaller, in the equal process of the port voltage of two battery packs
In, current fluctuation is small, and the infringement to lithium battery is also small；
The present embodiment sets microswitch in battery pack assembly 1 so that when battery bag is stood, the positive pole of two Battery pack groups
Between automatic short circuit can be distinguished between negative pole, it is ensured that the voltage of two Battery packs continue it is equal, will not be because of the formation pressure such as consumable
Difference；Meanwhile complete the series-parallel conversion of battery pack in itself by control unit, this serial or parallel connection conversion, do not increase new
Switching point or contact point, also without new control unit is increased, in the absence of circuit switching control complexity, cost height and circuit itself
The problems such as heat generation rate is high.
Claims (5)
1. a kind of electric tool, include battery pack assembly and can be with the battery pack assembly with merging to electric tool offer
The control unit of voltage, it is characterised in that：The battery pack assembly includes the battery pack of voltage identical first and the second battery
Group, electrically connected between first battery anode and the second battery anode and be provided with normally closed first microswitch, it is described
Electrically connected between first battery electrode and the second battery electrode and be provided with normally closed second microswitch；Correspondingly, it is described
Control unit includes input and output end, and the input of the control unit, which includes, is connected respectively first electricity
Pond group positive pole, the second battery anode, the first terminal of the first battery electrode and the second battery electrode, Second terminal,
Three terminals and forth terminal, the input of the control unit also include so that the first microswitch and the second microswitch simultaneously
The driving part of opening；The output end of the control unit with first battery pack and the second battery pack it is in parallel obtain first
Voltage or the second voltage obtained of being connected with first battery pack and the second battery pack are powered to the electric tool.
2. electric tool according to claim 1, it is characterised in that：First battery pack and the second battery pack are wrapped respectively
Include multiple element cells being serially connected.
3. electric tool according to claim 1, it is characterised in that：The battery pack assembly include three or three with
Upper voltage identical battery pack, the output end of the control unit with described three or more than three battery packs it is in parallel obtain the
Either described three or the series connection of more than three battery packs obtain second voltages and powered to the electric tool one voltage.
4. electric tool according to claim 1, it is characterised in that：First microswitch and the second microswitch are
Separate single connection plane switch, correspondingly, the driving part include the first actuator and the second actuator, and described first drives
Moving part and first microswitch are open mode with holding first microswitch is merged, second actuator and described
It is open mode that second microswitch keeps second microswitch with merging.
5. electric tool according to claim 1, it is characterised in that：First microswitch and the second microswitch are
The ganged switch mutually to link, correspondingly, the driving part include the 3rd actuator, the 3rd actuator with it is described double
It is open mode that connection switch keeps the ganged switch with merging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720859505.2U CN207021730U (en) | 2017-07-14 | 2017-07-14 | A kind of electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720859505.2U CN207021730U (en) | 2017-07-14 | 2017-07-14 | A kind of electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207021730U true CN207021730U (en) | 2018-02-16 |
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ID=61484337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720859505.2U Active CN207021730U (en) | 2017-07-14 | 2017-07-14 | A kind of electric tool |
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| CN (1) | CN207021730U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107302248A (en) * | 2017-07-14 | 2017-10-27 | 宁波锂想电子有限公司 | A kind of electric tool |
| US11289924B2 (en) | 2019-08-09 | 2022-03-29 | Techtronic Cordless Gp | Battery pack including a high- and low-current discharge terminals |
| US11424504B2 (en) | 2019-08-09 | 2022-08-23 | Techtronic Cordless Gp | Battery pack support portion configured to accommodate multiple different device interfaces |
-
2017
- 2017-07-14 CN CN201720859505.2U patent/CN207021730U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107302248A (en) * | 2017-07-14 | 2017-10-27 | 宁波锂想电子有限公司 | A kind of electric tool |
| CN107302248B (en) * | 2017-07-14 | 2024-01-19 | 宁波锂想电子有限公司 | Electric tool |
| US11289924B2 (en) | 2019-08-09 | 2022-03-29 | Techtronic Cordless Gp | Battery pack including a high- and low-current discharge terminals |
| US11424504B2 (en) | 2019-08-09 | 2022-08-23 | Techtronic Cordless Gp | Battery pack support portion configured to accommodate multiple different device interfaces |
| US11881733B2 (en) | 2019-08-09 | 2024-01-23 | Techtronic Cordless Gp | Battery pack including a high- and low-current discharge terminals |
| US11916245B2 (en) | 2019-08-09 | 2024-02-27 | Techtronic Cordless Gp | Battery pack support portion configured to accommodate multiple different device interfaces |
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