CN112713347A - Battery pack system, electric tool and battery pack system expansion method - Google Patents
Battery pack system, electric tool and battery pack system expansion method Download PDFInfo
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- CN112713347A CN112713347A CN202011546656.5A CN202011546656A CN112713347A CN 112713347 A CN112713347 A CN 112713347A CN 202011546656 A CN202011546656 A CN 202011546656A CN 112713347 A CN112713347 A CN 112713347A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention provides a battery pack system, an electric tool and a battery pack system capacity expansion method. The battery pack system includes: the first battery cell group is formed by connecting a plurality of same first battery cell units in series; the second battery cell group is formed by connecting a plurality of same second battery cell units in series, the number of the first battery cell units is the same as that of the second battery cell units, and each second battery cell unit in the second battery cell group is connected with the corresponding first battery cell unit in the first battery cell group in parallel one by one; one end of the connecting wire is connected with the first electric core group, and the other end of the connecting wire is connected with the second electric core group so as to connect the first electric core group and the second electric core group in parallel; and the battery management system is connected with the first electric core group so as to simultaneously manage and control the power supply output of the first electric core group and the second electric core group. Compared with the prior art, the battery pack system prolongs the service life.
Description
Technical Field
The invention relates to a battery pack system, an electric tool and a battery pack system capacity expansion method, and belongs to the field of battery management.
Background
Direct current electric tool, for example intelligent lawn mower, often because its battery capacity is less, leads to mowing the time weak point, and the area of mowing is little, and the number of times of recharging stake is many in the unit interval, leads to recharging the track on the circuit and seal heavier.
In view of the above, there is a need for an improved power tool to solve the above problems.
Disclosure of Invention
The invention aims to provide a battery pack system, an electric tool and a battery pack system expansion method, which can improve the service time and the service efficiency.
To achieve the above object, the present invention provides a battery pack system including:
the first battery cell group is formed by connecting a plurality of same first battery cell units in series;
the second battery cell group is formed by connecting a plurality of same second battery cell units in series, the number of the first battery cell units is the same as that of the second battery cell units, and each second battery cell unit in the second battery cell group is connected with the corresponding first battery cell unit in the first battery cell group in parallel one by one;
one end of the connecting wire is connected with the first electric core group, and the other end of the connecting wire is connected with the second electric core group so as to connect the first electric core group and the second electric core group in parallel; and
and the battery management system is connected with the first cell group so as to simultaneously manage and control the power supply output of the first cell group and the second cell group.
As a further improvement of the present invention, the battery pack system further includes a first circuit board electrically connected to the first cell group and a second circuit board electrically connected to the second cell group, and the battery management system is integrated on the first circuit board.
As a further improvement of the present invention, a soldering point is disposed on the first circuit board, and one end of the connecting wire is soldered and fixed to the soldering point on the first circuit board.
As a further improvement of the present invention, a first docking device is integrated on the first circuit board, a second docking device is disposed at one end of the connecting line, and the first docking device and the second docking device are plugged into each other to electrically connect the connecting line and the first electric core set.
As a further improvement of the present invention, a connecting device is integrated on the second circuit board, and the other end of the connecting wire is electrically connected to the connecting device.
As a further improvement of the present invention, an insertion device is disposed at the other end of the connecting line, and the insertion device is inserted and fixed with the connecting device to electrically connect the connecting line and the second electric core set.
As a further improvement of the present invention, the connecting device and the plugging device are both electric connectors, each electric connector includes an insulating body and a conductive terminal fixed in the insulating body, and the other end of the connecting wire is fixed with the conductive terminal of the plugging device.
As a further improvement of the present invention, a charging/discharging interface and a communication interface are further integrated on the first circuit board.
As a further improvement of the invention, the constant voltage values of the first electric core group and the second electric core group are both 22.2V.
As a further improvement of the present invention, the battery management system is used for monitoring the states of each cell unit of the first cell group and the second cell group, including temperature, overcharge voltage and overdischarge voltage.
In order to achieve the above object, the present invention further provides an electric tool including a motor, an actuator driven by the motor, and a battery pack system electrically connected to the motor, the battery pack system including:
the first battery cell group is formed by connecting a plurality of same first battery cell units in series;
the second battery cell group is formed by connecting a plurality of same second battery cell units in series, the number of the first battery cell units is the same as that of the second battery cell units, and each second battery cell unit in the second battery cell group is connected with the corresponding first battery cell unit in the first battery cell group in parallel one by one;
one end of the connecting wire is connected with the first electric core group, and the other end of the connecting wire is connected with the second electric core group so as to connect the first electric core group and the second electric core group in parallel; and
and the battery management system is connected with the first cell group so as to simultaneously manage and control the power supply output of the first cell group and the second cell group.
As a further improvement of the present invention, the battery pack system further includes a first circuit board electrically connected to the first cell group and a second circuit board electrically connected to the second cell group, and the battery management system is integrated on the first circuit board.
As a further improvement of the present invention, a soldering point is disposed on the first circuit board, and one end of the connecting wire is soldered and fixed to the soldering point on the first circuit board.
As a further improvement of the present invention, a first docking device is integrated on the first circuit board, a second docking device is disposed at one end of the connecting line, and the first docking device and the second docking device are plugged into each other to electrically connect the connecting line and the first electric core set.
As a further improvement of the present invention, a connecting device is integrated on the second circuit board, and the other end of the connecting wire is electrically connected to the connecting device.
As a further improvement of the present invention, an insertion device is disposed at the other end of the connecting line, and the insertion device is inserted and fixed with the connecting device to electrically connect the connecting line and the second electric core set.
As a further improvement of the present invention, the connecting device and the plugging device are both electric connectors, each electric connector includes an insulating body and a conductive terminal fixed in the insulating body, and the other end of the connecting wire is fixed with the conductive terminal of the plugging device.
As a further improvement of the present invention, a charging/discharging interface and a communication interface are further integrated on the first circuit board.
As a further improvement of the invention, the constant voltage values of the first electric core group and the second electric core group are both 22.2V.
As a further improvement of the present invention, the battery management system is used for monitoring the states of each cell unit of the first cell group and the second cell group, including temperature, overcharge voltage and overdischarge voltage.
As a further development of the invention, the actuator is a cutting blade adapted for use in a lawn mower.
In order to achieve the above object, the present invention further provides a battery pack system capacity expansion method, including the following steps:
providing a first battery cell group, wherein the first battery cell group is formed by connecting a plurality of same first battery cell units in series, and the first battery cell group is electrically connected with a battery management system;
providing a second battery cell group, wherein the second battery cell group is formed by connecting a plurality of identical second battery cell units in series, and the number of the second battery cell units is the same as that of the first battery cell units;
each second battery cell unit in the second battery cell group is connected with the corresponding first battery cell unit in the first battery cell group in parallel one by utilizing a connecting wire;
the cell units at the head end and the tail end in the first cell group and the second cell group are electrically connected by using a connecting wire, so that the first cell group and the second cell group are connected in parallel;
and the battery management system simultaneously manages and controls the power supply output of the first cell group and the second cell group.
The invention has the beneficial effects that: the battery pack system of the invention utilizes one battery management system to simultaneously manage the first electric core group and the second electric core group, thereby realizing the capacity expansion of the battery pack system and prolonging the service time of the battery pack system.
Drawings
Fig. 1 is a schematic block diagram of a battery pack system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a battery pack system according to an embodiment of the invention.
Fig. 3 is a partially exploded view of the connection device and the plug device of fig. 2.
Fig. 4 is a further exploded view of the connection device and plug device of fig. 3.
Fig. 5 is a schematic block diagram of a battery pack system applied to a plurality of electric core packs.
Fig. 6 is a schematic block diagram of a power tool according to an embodiment of the present invention.
Fig. 7a and 7b are schematic views of a smart mower according to an embodiment of the present invention.
Fig. 8 is a flowchart illustrating a capacity expansion method of a battery pack system according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a battery pack system according to another embodiment of the present invention.
Fig. 10 is an exploded view of fig. 9.
Fig. 11 is another angular schematic of fig. 10.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the present invention discloses a battery pack system 100, which includes a first electric core pack 10, a second electric core pack 20, a connecting wire 30 electrically connecting the first electric core pack 10 and the second electric core pack 20, and a Battery Management System (BMS) connected to the first electric core pack 10. In this embodiment, the Battery Management System (BMS) can simultaneously manage and control the power outputs of the first pack 10 and the second pack 20, thereby achieving the purpose of simultaneously controlling the two packs using one Battery Management System (BMS).
The first battery cell group 10 is formed by connecting a plurality of identical first battery cell units 11 in series, that is, the positive and negative electrodes of the plurality of first battery cell units 11 in the first battery cell group 10 are connected end to form a series connection; the second battery cell group 20 is also formed by serially connecting a plurality of identical second battery cell units 21, that is, the positive and negative electrodes of the plurality of second battery cell units 21 in the second battery cell group 20 are connected end to form a serial connection. It should be noted that: the number of the first cell units 11 in the first cell group 10 is the same as that of the second cell units 21 in the second cell group 20, and is 6, that is, the first cell group 10 is identical to the second cell group 20.
One end of the connecting wire 30 is connected to the first electric core group 10, and the other end is connected to the second electric core group 20, so as to realize the parallel connection between the first electric core group 10 and the second electric core group 20, that is, the electric core units at the head and the tail of the first electric core group 10 and the second electric core group 20 are electrically connected through the connecting wire 30, so as to connect the first electric core group 10 and the second electric core group 20 in parallel. In this embodiment, the fixed voltage values of the first electric core assembly 10 and the second electric core assembly 20 are both 22.2V, but not limited thereto.
In order to more effectively and evenly use the electric energy of the first cell group 10 and the second cell group 20, each second cell unit 21 in the second cell group 20 is connected with the corresponding first cell unit 11 in the first cell group 10 in parallel, so that the potential difference between the cell units in the same position can be better eliminated, the electric power can be more uniformly used, and the cell units are not thick and thin.
The battery pack system 100 further includes a first circuit board 12 electrically connected to the first cell group 10 and a second circuit board 22 electrically connected to the second cell group 20, the Battery Management System (BMS) is integrated on the first circuit board 12, and the second circuit board 22 does not have the integrated Battery Management System (BMS). The first circuit board 12 is provided with soldering points (e.g., B0-B6 in fig. 2), and one end of the connecting wire 30 is fixed to the soldering points on the first circuit board 12 by soldering, so as to electrically connect the connecting wire 30 to the first circuit board 12.
The second circuit board 22 is integrated with a connecting device 23, and the other end of the connecting wire 30 is electrically connected to the connecting device 23. Preferably, the other end of the connection line 30 is provided with an insertion device 31, and the insertion device 31 is inserted and fixed with the connection device 23 to electrically connect the connection line 30 and the second cell group 20. In this embodiment, the connecting device 23 and the plugging device 31 are both electric connectors, each electric connector includes an insulating body and a conductive terminal fixed in the insulating body, and the other end of the connecting wire 30 is fixed to the conductive terminal of the plugging device 31. With such an arrangement, the electrical contact between the connecting device 23 and the plugging device 31 can be utilized to electrically connect the connecting wire 30 and the second circuit board 22, and thus, the electrical connection between the first circuit board 12 and the second circuit board 22 can be realized.
As shown in fig. 3 and 4, the connecting device 23 includes a first insulating body 231 and a first conductive terminal 232 fixed in the first insulating body 231, a mating space 233 is formed in the first insulating body 231, and the first conductive terminal 232 is received in the first insulating body 231 and is partially exposed to the mating space 233. The plug device 31 includes a second insulating body 311 and a second conductive terminal 312 fixed in the second insulating body 311, wherein an accommodating space 313 for accommodating the second conductive terminal 312 is formed in the second insulating body 311, and the second conductive terminal 312 is entirely accommodated in the accommodating space 313.
When the connecting device 23 and the plugging device 31 are plugged and fixed, because the connecting device 23 is integrated on the second circuit board 22, the plugging device 31 is directly inserted into the docking space 233 of the connecting device 23, so that the first conductive terminal 232 extends into the accommodating space 313 to electrically contact with the second conductive terminal 312, at this time, the electrical conduction between the connecting device 23 and the plugging device 31 is realized, and then the electrical conduction between the connecting wire 30 and the second circuit board 22 is also realized. In this way, the Battery Management System (BMS) integrated on the first circuit board 12 can be used to simultaneously manage and control the power output of the first cell group 10 and the second cell group 20. Of course, the Battery Management System (BMS) is also used to monitor the state of each cell unit of the first and second cell packs 10 and 20, including temperature, overcharge voltage, overdischarge voltage, and the like.
The first circuit board 12 is further integrated with a transmission device 40, the transmission device 40 is provided with a charge-discharge interface and a communication interface, and the charge-discharge interface and the communication interface are both used for being connected with external equipment so as to realize a charge-discharge function and a communication function. It should be noted that: the specific structure of the transmission device 40 can be designed according to the prior art, and is not limited herein; the external device may be any type of power tool, such as a power mower, and is not limited herein.
As shown in fig. 6, the present invention further provides an electric tool 200, wherein the electric tool 200 includes a motor 201, an actuator 202 driven by the motor 201, and a battery pack system 203, and the battery pack system 203 is electrically connected to the motor 201. Specifically, the motor 201 can drive the executing component 202 to complete the work, and the battery pack system 203 can provide power for the motor 201, so that the service time can be greatly prolonged. The specific structure and the corresponding working principle of the battery pack system 203 are the same as those of the battery pack system 100 shown in fig. 1 to 4, and the detailed contents may refer to the foregoing description of the characters related to fig. 1 to 4, and are not repeated herein.
Preferably, the actuating member 202 is a cutting blade suitable for a lawn mower, that is, the electric tool 200 is an electric lawn mower, and the first electric core set 10 and the second electric core set 20 are directly fixed in the electric lawn mower 200, and cannot be detached independently because the first electric core set 10 and the second electric core set 20 have no outer casing. When the electric mower 200 operates, the first cell group 10 and the second cell group 20 operate in parallel to share one Battery Management System (BMS).
Fig. 7a and 7b are schematic views of an intelligent lawn mower 300 according to an embodiment of the present invention. The intelligent mower 300 comprises a housing 301, a travelling wheel 302 mounted at the bottom of the housing 301 for supporting the whole intelligent mower 300 and driving the whole intelligent mower 300 to travel, a motor 303 accommodated in the housing 301, and a cutting blade 304 exposed outside the bottom of the housing 301, wherein the cutting blade 304 is connected to a motor shaft of the motor 303, so that when the motor 303 rotates, the cutting blade 304 can be driven to rotate by the motor shaft to realize a cutting function. The battery pack system 305 is also accommodated in the housing 301, and the battery pack system 305 has the same structure and working principle as the battery pack system 100, and is used for providing power for the motor 303, so as to ensure that the motor 303 has sufficient power to rotate, and then drive the cutting blade 304 to continuously perform a cutting action.
After the battery pack system 305 is applied to the intelligent mower 300, not only is the electric energy expansion realized, the service life of single charging is prolonged (namely, the endurance mileage is prolonged), but also the service life of the battery pack system 305 is prolonged, higher voltage can be obtained, and then smaller current and sufficient output power are obtained, and the working requirement is met.
As shown in fig. 8, a method for expanding a battery pack system according to an embodiment of the present invention mainly includes the following steps:
providing a first battery cell group 10, wherein the first battery cell group 10 is formed by connecting a plurality of identical first battery cell units 11 in series, and electrically connecting the first battery cell group 10 with a Battery Management System (BMS);
providing a second battery cell group 20, wherein the second battery cell group 20 is formed by connecting a plurality of identical second battery cell units 21 in series, and the number of the second battery cell units 21 is the same as that of the first battery cell units 11;
each second cell unit 21 in the second cell group 20 is connected with the corresponding first cell unit 11 in the first cell group 10 in parallel one by using the connecting wire 30;
the cell units at the head and tail ends in the first cell group 10 and the second cell group 20 are electrically connected by using the connecting wire 30, so that the first cell group 10 and the second cell group 20 are connected in parallel;
a Battery Management System (BMS) simultaneously manages and controls the power output of the first and second pack 10 and 20.
As shown in fig. 5, when n groups of electric cores are provided, the battery pack system 100 can simultaneously manage and control the n groups of electric cores by using one Battery Management System (BMS), so that the capacity of the battery pack system 100 is further improved, and the use requirement of the high-power electric tool can be further satisfied.
It should be noted that: no matter how much n is equal, the Battery Management System (BMS) is connected to the first cell group 10 only, and all the cell groups except the first cell group 10 are connected in parallel through the connecting wire 30, and at the same time, a plurality of cell units with the same sequencing position in different cell groups are connected in parallel, that is, in fig. 5, the second cell unit 21 arranged at the first in the second cell group 20 is connected in parallel with the cell unit arranged at the first in the nth cell group, the second cell unit 21 arranged at the second in the second cell group 20 is connected in parallel with the cell unit arranged at the second in the nth cell group, and so on, so that the potential difference between the cell units with the same position can be better eliminated, the electric power can be used more uniformly, and the cell groups cannot be thick and thin.
In the above embodiment, the connection wires 30 are fixed to the first circuit board 12 by soldering, but in other embodiments, the connection wires 30 can be electrically connected to the first circuit board 12 by inserting two connectors into each other, similar to the connection between the connection wires 30 and the second circuit board 22.
For example, as shown in fig. 9 to 11, a second embodiment of the battery pack system is illustrated. In this embodiment, the structure of the battery pack system 100' is substantially the same as that of the battery pack system 100 in the first embodiment, and the difference is mainly that: the connecting wires 30 are soldered to the first circuit board 12 in the first embodiment, and the connecting wires 30 'and the first circuit board 12' are connected to each other by two connectors. Specifically, a first docking device 13 is integrated on the first circuit board 12 ', a second docking device 32 is disposed at one end of the connection line 30 ', and the first docking device 13 and the second docking device 32 are plugged into each other, so as to electrically connect the connection line 30 ' and the first electric core assembly 10.
In this embodiment, the first docking device 13 and the second docking device 32 are both electrical connectors, the electrical connectors include an insulative housing and conductive terminals fixed in the insulative housing, and one end of the connection wire 30' is fixed to the conductive terminals of the second docking device 32. Thus, the first docking device 13 and the second docking device 32 can be electrically connected to each other to electrically connect the connection wires 30 'and the first circuit board 12'. Of course, the specific structure of the first docking device 13 and the second docking device 32 may be designed according to actual needs, or directly adopt the existing technical solution, and is not limited herein.
Of course, in other embodiments, the connection line 30' and the second circuit board 22 may also be fixed by soldering, and is not limited herein.
In summary, the battery pack system 100 of the present invention uses one Battery Management System (BMS) to simultaneously manage the first electric core pack 10 and the second electric core pack 20, so that not only the capacity expansion of the battery pack system 100 is realized, the service life of a single charge is prolonged, but also the service life of the battery pack is prolonged.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (22)
1. A battery pack system, comprising:
the first battery cell group is formed by connecting a plurality of same first battery cell units in series;
the second battery cell group is formed by connecting a plurality of same second battery cell units in series, the number of the first battery cell units is the same as that of the second battery cell units, and each second battery cell unit in the second battery cell group is connected with the corresponding first battery cell unit in the first battery cell group in parallel one by one;
one end of the connecting wire is connected with the first electric core group, and the other end of the connecting wire is connected with the second electric core group so as to connect the first electric core group and the second electric core group in parallel; and
and the battery management system is connected with the first cell group so as to simultaneously manage and control the power supply output of the first cell group and the second cell group.
2. The battery pack system of claim 1, wherein: the battery pack system further comprises a first circuit board electrically communicated with the first electric core group and a second circuit board electrically communicated with the second electric core group, and the battery management system is integrated on the first circuit board.
3. The battery pack system according to claim 2, wherein: and a welding point is arranged on the first circuit board, and one end of the connecting wire is fixedly welded with the welding point on the first circuit board.
4. The battery pack system according to claim 2, wherein: the first circuit board is integrated with a first butt joint device, one end of the connecting wire is provided with a second butt joint device, and the first butt joint device and the second butt joint device are mutually spliced so as to realize the electric conduction of the connecting wire and the first electric core group.
5. The battery pack system according to claim 3 or 4, wherein: the second circuit board is integrated with a connecting device, and the other end of the connecting wire is electrically connected with the connecting device.
6. The battery pack system of claim 5, wherein: the other end of the connecting wire is provided with an inserting device, and the inserting device is fixedly inserted with the connecting device so as to realize the electrical conduction of the connecting wire and the second cell group.
7. The battery pack system of claim 6, wherein: the connecting device and the plug-in device are both electric connectors, each electric connector comprises an insulating body and a conductive terminal fixed in the insulating body, and the other end of the connecting wire is fixed with the conductive terminal of the plug-in device.
8. The battery pack system according to claim 2, wherein: and the first circuit board is also integrated with a charging and discharging interface and a communication interface.
9. The battery pack system of claim 1, wherein: the frequency constant voltage values of the first electric core group and the second electric core group are both 22.2V.
10. The battery pack system of claim 1, wherein: the battery management system is used for monitoring the states of each battery cell unit of the first battery cell group and the second battery cell group, wherein the states include temperature, overcharge voltage and overdischarge voltage.
11. An electric power tool including a motor and an actuator driven by the motor, characterized in that: still include the battery package system, the battery package system with the motor constitutes the electricity and is connected, the battery package system includes:
the first battery cell group is formed by connecting a plurality of same first battery cell units in series;
the second battery cell group is formed by connecting a plurality of same second battery cell units in series, the number of the first battery cell units is the same as that of the second battery cell units, and each second battery cell unit in the second battery cell group is connected with the corresponding first battery cell unit in the first battery cell group in parallel one by one;
one end of the connecting wire is connected with the first electric core group, and the other end of the connecting wire is connected with the second electric core group so as to connect the first electric core group and the second electric core group in parallel; and
and the battery management system is connected with the first cell group so as to simultaneously manage and control the power supply output of the first cell group and the second cell group.
12. The power tool of claim 11, wherein: the battery pack system further comprises a first circuit board electrically communicated with the first electric core group and a second circuit board electrically communicated with the second electric core group, and the battery management system is integrated on the first circuit board.
13. The power tool of claim 12, wherein: and a welding point is arranged on the first circuit board, and one end of the connecting wire is fixedly welded with the welding point on the first circuit board.
14. The power tool of claim 12, wherein: the first circuit board is integrated with a first butt joint device, one end of the connecting wire is provided with a second butt joint device, and the first butt joint device and the second butt joint device are mutually spliced so as to realize the electric conduction of the connecting wire and the first electric core group.
15. The power tool according to claim 13 or 14, characterized in that: the second circuit board is integrated with a connecting device, and the other end of the connecting wire is electrically connected with the connecting device.
16. The power tool of claim 15, wherein: the other end of the connecting wire is provided with an inserting device, and the inserting device is fixedly inserted with the connecting device so as to realize the electrical conduction of the connecting wire and the second cell group.
17. The power tool of claim 16, wherein: the connecting device and the plug-in device are both electric connectors, each electric connector comprises an insulating body and a conductive terminal fixed in the insulating body, and the other end of the connecting wire is fixed with the conductive terminal of the plug-in device.
18. The power tool of claim 12, wherein: and the first circuit board is also integrated with a charging and discharging interface and a communication interface.
19. The power tool of claim 11, wherein: the frequency constant voltage values of the first electric core group and the second electric core group are both 22.2V.
20. The power tool of claim 11, wherein: the battery management system is used for monitoring the states of each battery cell unit of the first battery cell group and the second battery cell group, wherein the states include temperature, overcharge voltage and overdischarge voltage.
21. The power tool of claim 11, wherein: the actuator is a cutting blade adapted for use with a lawn mower.
22. A capacity expansion method of a battery pack system is characterized by comprising the following steps:
providing a first battery cell group, wherein the first battery cell group is formed by connecting a plurality of same first battery cell units in series, and the first battery cell group is electrically connected with a battery management system;
providing a second battery cell group, wherein the second battery cell group is formed by connecting a plurality of identical second battery cell units in series, and the number of the second battery cell units is the same as that of the first battery cell units;
each second battery cell unit in the second battery cell group is connected with the corresponding first battery cell unit in the first battery cell group in parallel one by utilizing a connecting wire;
the cell units at the head end and the tail end in the first cell group and the second cell group are electrically connected by using a connecting wire, so that the first cell group and the second cell group are connected in parallel;
and the battery management system simultaneously manages and controls the power supply output of the first cell group and the second cell group.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011546656.5A CN112713347A (en) | 2020-12-24 | 2020-12-24 | Battery pack system, electric tool and battery pack system expansion method |
| EP21803192.0A EP4149237A4 (en) | 2020-05-14 | 2021-03-31 | A robotic mower with collision and detection assemblies |
| US17/218,193 US20210352842A1 (en) | 2020-05-14 | 2021-03-31 | Robotic Mower with Collision and Detection Assemblies |
| PCT/CN2021/084567 WO2021227691A1 (en) | 2020-05-14 | 2021-03-31 | A robotic mower with collision and detection assemblies |
| EP21166309.1A EP3909411A3 (en) | 2020-05-14 | 2021-03-31 | A robotic mower with collision and detection assemblies |
| CN202180029832.4A CN115666221A (en) | 2020-05-14 | 2021-03-31 | Grass cutter |
| US17/973,538 US20230051150A1 (en) | 2020-05-14 | 2022-10-26 | Robotic Mower with Collision and Detection Assemblies |
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| CN202011546656.5A CN112713347A (en) | 2020-12-24 | 2020-12-24 | Battery pack system, electric tool and battery pack system expansion method |
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| CN112713347A true CN112713347A (en) | 2021-04-27 |
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| CN206595315U (en) * | 2017-01-20 | 2017-10-27 | 江西优特汽车技术有限公司 | A kind of battery bag connects protection system |
| CN208986128U (en) * | 2018-09-20 | 2019-06-14 | 东莞市云帆电子科技有限公司 | A kind of split type multimode lithium battery mould group |
| CN111987249A (en) * | 2019-05-23 | 2020-11-24 | 南京德朔实业有限公司 | Battery pack and electric tool |
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| CN103262331A (en) * | 2010-10-19 | 2013-08-21 | Alte动力科技股份有限公司 | Battery management system utilizing stackable batteries |
| CN206595315U (en) * | 2017-01-20 | 2017-10-27 | 江西优特汽车技术有限公司 | A kind of battery bag connects protection system |
| CN208986128U (en) * | 2018-09-20 | 2019-06-14 | 东莞市云帆电子科技有限公司 | A kind of split type multimode lithium battery mould group |
| CN111987249A (en) * | 2019-05-23 | 2020-11-24 | 南京德朔实业有限公司 | Battery pack and electric tool |
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Application publication date: 20210427 |