Electric energy storage device and electric tool system

Patent metadata

Field	Value
Publication number	US-12095108-B2
Application number	US-202117344934-A
Country	US
Kind code	B2
Filing date	Jun 10, 2021
Priority date	Dec 20, 2018
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

An electric energy storage device, comprising N energy units with a same rated voltage and provided with a socket, wherein the N energy units are equally divided into M energy modules. Each energy module comprises K energy units, wherein M≥2 and K≥2, and can be switched between parallel and series connection states. The disclosure also provides an electric tool system, wherein the electric tools with different rated voltages have different plugs, and the electric energy storage device outputs different voltages after connecting with the socket. The electric energy storage device with multiple output voltages can be suitable for electric energy storage devices with different rated voltages, and reduces the cost.

First claim

What is claimed is:

1. An electric energy storage device, comprising N energy units with a same rated voltage, wherein the N energy units are equally divided into M energy modules, and each energy module includes K energy units, wherein M≥2 and K≥2, the K energy units in each energy module is capable of being switched to connect to each other in series or in parallel;
and a socket;
wherein, the rated voltage of each energy unit is nV, the N energy units of the electric energy storage device have four connection states:
wherein, K energy units in the energy module are connected in parallel, and M energy modules are connected in parallel, and an output voltage of the electric energy storage device is nV, or K energy units in the energy module are connected in series, and M energy modules are connected in series and the output voltage is N*nV, or K energy units in the energy module are connected in series, and the M energy modules are connected in parallel and the output voltage is K*nV, or K energy units in the energy module are connected in parallel, and M energy modules are connected in series and the output voltage is M*nV,
which means these four connection states provide at least three output voltages.

2. The electric energy storage device according to claim 1 , wherein
the socket includes an in—module control unit corresponding to the energy module, and
the in—module control unit includes a plurality of parallel switches connecting the K energy units in parallel connection and one or a plurality of series switches connecting the K energy units in series connection corresponding to each of the energy modules,
when the plurality of the parallel switches is switched on and the one or the plurality of the series switches is switched off, the K energy units are connected in parallel; and
when the plurality of the parallel switches is switched off and the one or the plurality of the series switches is switched on, the K energy units are connected in series.

3. The electric energy storage device according to claim 2 , wherein
the in—module control unit includes 2*(K−1) parallel switches, and
the parallel switches are respectively connected to electrodes with a same polarity of the K energy units in pairs; and
the in—module control unit includes (K−1) series switches, and
the series switches are respectively connected to electrodes with different polarities of the K energy unit in pairs.

4. The electric energy storage device according to claim 2 , wherein
the parallel switches are normally closed switches, the series switch(es) is a normally open switch, and the K energy units in the energy module are connected in parallel in an initial state; or
the parallel switches are normally open switch, the series switch(es) is a normally closed switch, and the K energy units in the energy module are connected in series in an initial state.

5. The electric energy storage device according to claim 2 , wherein
the socket further comprises an inter—module control unit,
the inter—module control unit comprises a parallel switch connecting M of the energy modules in parallel and a series switch connecting M of the energy modules in series;
when the parallel switch of the inter—module control unit switches on and the series switch of the inter—module control unit switches off, the M energy modules are connected in parallel; and
when the parallel switch of the inter—module control unit is switched off and the series switch is switched on, the M energy modules are connected in series.

6. The electric energy storage device according to claim 5 , wherein
the socket further comprises two voltage output terminals.

7. The electrical energy storage device according to claim 1 , wherein
each of the energy units is provided with a positive electrode and a negative electrode,
the socket includes eight electrode terminals set independently; and
the eight electrode terminals include four positive terminals connected to positive electrodes of the four energy units and four negative terminals connected to negative electrodes of the four energy units.

8. The electric energy storage device of claim 1 , wherein
a number of output voltage of the electric energy storage device is equal to the number of factors of N.

9. The electrical energy storage device according to claim 8 , wherein
when N≥8, the energy units can be equally divided into multi—level modules,
each level of energy modules includes 2 or 3 secondary modules, and energy modules with the lowest level includes 2 or 3 energy units.

10. An electric tool system, comprising an electric tool and an electrical energy storage device, wherein
the electrical energy storage device comprises N energy units with a same rated voltage, the N energy units are equally divided into M energy modules, and each of the energy modules includes K energy units, wherein M≥2 and K≥2; the K energy units in each energy module is capable of being switched to connect to each other in series or in parallel;
the electrical energy storage device further comprises a socket; and
the electric tool is provided with a plug that matches with the socket;
wherein, the rated voltage of each energy unit is nV, the N energy units of the electric energy storage device have four connection states:
wherein, K energy units in the energy module are connected in parallel, and M energy modules are connected in parallel, and an output voltage of the electric energy storage device is nV, or K energy units in the energy module are connected in series, and M energy modules are connected in series and the output voltage is N*nV, or K energy units in the energy module are connected in series, and the M energy modules are connected in parallel and the output voltage is K*nV, or K energy units in the energy module are connected in parallel, and M energy modules are connected in series and the output voltage is M*nV,
which means these four connection states provide at least three output voltages.

11. The electric tool system according to claim 10 , wherein
the socket includes an in—module control unit corresponding to each of the energy modules, and
the in—module control unit includes a plurality of parallel switches connecting the K energy units in parallel connection and one or a plurality of series switches connecting the K energy units in series connection;
when the plurality of the parallel switches is switched on and the one or the plurality of the series switches is switched off, the K energy units are connected in parallel; and
when the plurality of the parallel switches is switched off and the one or the plurality of the series switches is switched on, the K energy units are connected in series.

12. The electric tool system according to claim 11 , wherein
the plug is provided with an internal switching part;
the internal switching part cooperates with the in—module control unit, and simultaneously switches the parallel connection state and the series connection state of the in—module control unit, which makes the K energy units in the energy module switch from parallel connection to series connection or from series connection to parallel connection.

13. The electric tool system according to claim 12 , wherein
the internal switching part includes an insulating part and a conductive part, wherein
one kind of the parallel switch and the series switch of the in—module control unit is initially closed and disconnected by the insulating part, and the other one is initially opened and connected by the conductive part.

14. The electric tool system according to claim 11 , wherein
the socket further comprises an inte

Assignees

• Globe Jiangsu Co Ltd

Inventors

• Liu Chuanjun
• Guo Xinzhong
• Yan An

Classifications

• H02J7/855

  with circuits adapted for supplying loads from the battery · CPC title

• H02J7/575 Primary

  Parallel/serial switching of connection of batteries to charge or load circuit · CPC title

• H02J7/751

  concerning the insertion or the connection of the batteries · CPC title

• H01M50/50

  Current conducting connections for cells or batteries · CPC title

• H01R13/113

  co-operating with pins or blades having a rectangular transverse section · CPC title