Energy storage system

Abstract

The invention provides an energy storage system, and the system comprises an inversion device which comprises a housing and an inverter disposed in the housing; the at least one first battery pack is configured to be detachably mounted on the shell; the at least one second battery pack is configured to be detachably mounted on the shell; the inverter is configured to receive and generate an alternating current power output from the first battery pack and / or the second battery pack; wherein the second battery pack is different from the first battery pack; when the first battery pack and the second battery pack are both installed on the shell, the second battery pack is suitable for charging the first battery pack through the inverter device. The technical scheme is suitable for combining and configuring battery packs with different specifications.

Description

Technical Field

[0001] The present invention relates to an energy storage system. Background Art

[0002] With the rapid development of new energy, the demand for energy storage systems is increasing day by day. Traditional energy storage systems usually adopt a battery configuration with a fixed capacity and a single specification, which has the problem of insufficient flexibility and cannot flexibly adjust the battery capacity or output voltage according to the actual power consumption requirements, making it difficult to adapt to diverse application scenarios.

[0003] US20160099575A1 patent discloses a portable power system, the core of which is to achieve compatible power supply for corded and cordless devices through a detachable battery pack, support AC / DC hybrid input, can combine the battery pack and an external power supply to increase the output power, and has functions such as charge management and status monitoring, solving the problems of poor compatibility and limited power of traditional power systems, and is applicable to various scenarios such as tools and household appliances.

[0004] However, this portable power system only supports the use of battery packs with a single nominal voltage and cannot adapt to battery packs of different voltage levels, resulting in the inability to adapt to electric tools of different voltage levels during use. Users need to carry multiple batteries or conversion devices additionally, increasing the usage cost and operation complexity.

[0005] In addition, this portable power system can only rely on an external AC power supply for charging and cannot achieve energy transfer between battery packs when there is no external power supply. For example, when the low-voltage battery pack has insufficient power, the high-voltage battery pack cannot be used as a backup power supply to charge it. Summary of the Invention

[0006] The present invention aims to solve the above technical problems and provides an energy storage system that is modular and suitable for combining and configuring battery packs of different specifications for use.

[0007] An energy storage system provided by the present invention is characterized by comprising:

[0008] An inverter device, which includes a housing and an inverter located in the housing;

[0009] At least one first battery pack, which is detachably installed on the housing;

[0010] At least one second battery pack, which is detachably installed on the housing;

[0011] The inverter is configured to receive DC power from the first battery pack and / or the second battery pack and output AC power; wherein,

[0012] The second battery pack is different from the first battery pack;

[0013] When both the first battery pack and the second battery pack are installed in the housing, the second battery pack is adapted to charge the first battery pack through the inverter device.

[0014] Further, the second battery pack is detachably installed at the bottom of the housing, and the inverter device is stacked on the second battery pack.

[0015] Further, there are a plurality of the second battery packs, and the plurality of second battery packs are stacked on each other and remain connected in parallel.

[0016] Further, either the first battery pack or the second battery pack that is disassembled and separated from the housing is adapted to supply power to a first DC power-consuming device or a second DC power-consuming device correspondingly, wherein the first DC power-consuming device is different from the second DC power-consuming device.

[0017] Further, the second battery pack has a higher nominal voltage than the first battery pack.

[0018] Further, the second battery pack has a higher nominal battery capacity than the first battery pack.

[0019] Further, the inverter device includes a charging circuit located in the housing. When the controller detects that a first power parameter of the first battery pack is lower than a first preset threshold and a second power parameter of the second battery pack is higher than a second preset threshold, the controller controls the charging circuit to be turned on, and the second battery pack charges the first battery pack through the charging circuit.

[0020] Further, the first power parameter is voltage or remaining power; and / or, the second power parameter is voltage or remaining power.

[0021] Further, the charging circuit includes a bidirectional DC / DC converter and a switch. The bidirectional DC / DC converter and the switch are arranged between the first battery pack and the second battery pack. Under the condition that the switch is closed, the second battery pack is adapted to charge the first battery pack through the bidirectional DC / DC converter.

[0022] Further, the bidirectional DC / DC converter and a bidirectional DC / AC converter are combined to form a bidirectional inverter. The first battery pack or the second battery pack is connected to the bidirectional DC / AC converter through the bidirectional DC / DC converter, and the other is directly connected to the bidirectional DC / AC converter.

[0023] Further, when the inverter device is connected to an external AC power supply, the AC power received by the charging interface is rectified by the bidirectional DC / AC converter into DC power, which preferentially supplies the first battery pack for charging 200. After the first battery pack is fully charged, the power supply switches to charge the second battery pack.

[0024] Further, the inverter output power generated by the power output of a single second battery pack to the inverter device is equivalent to the inverter output power generated by the power output of multiple first battery packs to the inverter device.

[0025] Another energy storage system provided by the present invention is characterized by comprising:

[0026] An inverter device, including a housing and an inverter within the housing;

[0027] At least one first battery pack and at least one third battery pack, which are respectively detachably mounted on the housing, and the first battery pack and the third battery pack are low-voltage battery packs with different nominal voltages;

[0028] At least one second battery pack, which is detachably mounted on the housing, and the second battery pack is a high-nominal-voltage battery pack;

[0029] The second battery pack is adapted to charge the first battery pack and / or the third battery pack through the inverter device.

[0030] Further, the inverter is configured to selectively receive DC electrical energy from the first battery pack, the second battery pack, and the third battery pack, either singly or simultaneously selecting multiple battery packs, and output AC electrical energy through inverter conversion.

[0031] Further, the nominal voltages of the first battery pack and the third battery pack are less than 40V; the nominal voltage of the second battery pack is above 40V.

[0032] Further, after any one of the first battery pack, the second battery pack, and the third battery pack is detached from the housing, it is adapted to be used as a power source alone to supply power to a first DC electrical device, a second DC electrical device, or a third DC electrical device respectively;

[0033] Wherein, the first, second, and third DC electrical devices are different types of electrical loads.

[0034] Further, the housing of the inverter device is provided with support feet, and the third battery pack is mounted on the mounting part between the support feet and does not exceed the bottom surface of the support feet after installation.

[0035] Further, when the inverter device simultaneously receives and installs the first battery pack, the second battery pack, and the third battery pack;

[0036] When performing inverse AC power output, it is preferred to receive the DC power of the second battery pack for inverse AC power output.

[0037] When connecting to an external AC power supply, it is preferred to charge the first battery pack first to quickly fully charge the first battery pack with a relatively low nominal voltage to meet user needs, and then charge the third battery pack, and finally charge the second battery pack.

[0038] Among them, the nominal voltage U2 of the second battery pack > the nominal voltage U3 of the third battery pack > the nominal voltage U1 of the first battery pack.

[0039] Another energy storage system provided by the present invention is characterized in that it includes:

[0040] An inversion device, which includes a housing and an inverter located in the housing, and the inverter at least includes a bidirectional DC / DC converter and a bidirectional DC / AC converter;

[0041] At least one first battery pack, which is detachably installed on the housing and is connected to the bidirectional DC / AC converter after being boosted by the bidirectional DC / DC converter;

[0042] At least one second battery pack, which is detachably installed on the housing and is directly connected to the bidirectional DC / AC converter;

[0043] When the voltage of the second battery pack is lower than the cut-off voltage, the inversion device switches to be powered by the first battery pack.

[0044] Further, when the inversion device is connected to an external AC power supply, it preferentially charges the first battery pack, and switches to charge the second battery pack after the charging is completed.

[0045] The beneficial technical effects of the present invention compared with the prior art are as follows:

[0046] In the energy storage system provided by the present invention, when both the first battery pack and the second battery pack are installed on the housing, the second battery pack is suitable for charging the first battery pack through the inversion device, so that when the user goes out for work, two different types of battery packs can be carried, and one of the battery packs is used as a backup power supply. When the battery pack that needs to be used has insufficient power, the backup power supply can be installed on the inversion device to charge the battery pack that has insufficient power and needs to be used. Description of the Drawings

[0047] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0048] Figure 1 : Structural schematic diagram of Specific Embodiment 1 of the energy storage system structure of the present invention;

[0049] Figure 2 : Cross-sectional view of the structure of Specific Embodiment 1 of the energy storage system structure of the invention Figure 1 ;

[0050] Figure 3 : Structural schematic diagram of the second battery pack in Specific Embodiment 1 of the energy storage system structure of the invention;

[0051] Figure 4 : Cross-sectional view of the structure of Specific Embodiment 1 of the energy storage system structure of the invention Figure 2 ;

[0052] Figure 5 : Structural schematic diagram of Specific Embodiment 2 of the energy storage system structure of the present invention;

[0053] Figure 6 : Structural schematic diagram of the inverter device in Specific Embodiment 2 of the energy storage system structure of the present invention;

[0054] Figure 1a : Structural schematic diagram of Specific Embodiment 1a of the energy storage system structure of the present invention;

[0055] Figure 2a : Structural schematic diagram of Specific Embodiment 2a of the energy storage system structure of the present invention;

[0056] Figure 1b : Structural schematic diagram of Specific Embodiment 1b of the energy storage system structure of the present invention;

[0057] Figure 2b : Structural schematic diagram of Specific Embodiment 2b of the energy storage system structure of the present invention;

[0058] Figure 7 : Discharge schematic block diagram of Specific Embodiment 1 of the charge and discharge of the energy storage system of the present invention;

[0059] Figure 8 : Charge schematic block of Specific Embodiment 1 of the charge and discharge of the energy storage system of the present invention Figure 1 ;

[0060] Figure 9 : Charge schematic block of Specific Embodiment 1 of the charge and discharge of the energy storage system of the present invention Figure 2 ;

[0061] Figure 10 : Schematic block diagram of discharging in Specific Embodiment 2 of the charging and discharging of the energy storage system of the present invention;

[0062] Figure 11 : Schematic block diagram of charging in Specific Embodiment 2 of the charging and discharging of the energy storage system of the present invention Figure 1 ;

[0063] Figure 12 : Schematic block diagram of charging in Specific Embodiment 2 of the charging and discharging of the energy storage system of the present invention Figure 2 ;

[0064] Figure 13 : Schematic block diagram of discharging in Specific Embodiment 3 of the charging and discharging of the energy storage system of the present invention;

[0065] Figure 14 : Schematic block diagram of charging in Specific Embodiment 3 of the charging and discharging of the energy storage system of the present invention Figure 1 ;

[0066] Figure 15 : Schematic block diagram of charging in Specific Embodiment 3 of the charging and discharging of the energy storage system of the present invention Figure 2 ;

[0067] Figure 16 : Schematic block diagram of Specific Embodiment 4 of the charging and discharging of the energy storage system of the present invention;

[0068] Figure 17 : Schematic block diagram of charging in Specific Embodiment 4 of the charging and discharging of the energy storage system of the present invention Figure 1 ;

[0069] Figure 18 : Schematic block diagram of charging in Specific Embodiment 4 of the charging and discharging of the energy storage system of the present invention Figure 2 ;

[0070] Figure 19 : Schematic block diagram of Specific Embodiment 5 of the charging and discharging of the energy storage system of the present invention;

[0071] Figure 20 : Schematic block diagram of charging in Specific Embodiment 5 of the charging and discharging of the energy storage system of the present invention Figure 1 ;

[0072] Figure 21 : Schematic block diagram of charging in Specific Embodiment 5 of the charging and discharging of the energy storage system of the present invention Figure 2 ;

[0073] Figure 22 : Schematic block diagram of discharging in Specific Embodiment 6 of the charging and discharging of the energy storage system of the present invention;

[0074] Figure 23 : Schematic block diagram of charging in Specific Embodiment 7 of the charging and discharging of the energy storage system of the present invention Figure 1 ;

[0075] Figure 24 : Schematic diagram of charging in the 8th specific embodiment of charging and discharging of the energy storage system of the present invention Figure 2 ;

[0076] Figure 25 : Schematic diagram of the principle of Embodiment 1 of the home energy storage system of the present invention;

[0077] Figure 26 : Schematic diagram of the application of Embodiment 1 of the outdoor energy storage of the present invention;

[0078] Figure 27 : Schematic diagram of Working Mode 1 of Embodiment 1 of the outdoor energy storage system of the present invention;

[0079] Figure 28 : Schematic diagram of Working Mode 2 of Embodiment 1 of the outdoor energy storage system of the present invention;

[0080] Figure 29 : Schematic diagram of Working Mode 3 of Embodiment 1 of the outdoor energy storage system of the present invention;

[0081] Figure 30 : Schematic diagram of the principle of Embodiment 2 of the home energy storage system of the present invention;

[0082] Figure 31 : Schematic diagram of Working Mode 1 of Embodiment 2 of the outdoor energy storage system of the present invention;

[0083] Figure 32 : Schematic diagram of the home energy storage system corresponding to Working Mode 1 of Embodiment 2 of the outdoor energy storage system of the present invention;

[0084] Figure 33 : Schematic diagram of Working Mode 2 of Embodiment 2 of the outdoor energy storage system of the present invention;

[0085] Figure 34 : Schematic diagram of the home energy storage system corresponding to Working Mode 2 of Embodiment 2 of the outdoor energy storage system of the present invention;

[0086] Figure 35 : Schematic diagram of Working Mode 3 of Embodiment 2 of the outdoor energy storage system of the present invention;

[0087] Figure 36 : Schematic diagram of the home energy storage system corresponding to Working Mode 3 of Embodiment 2 of the outdoor energy storage system of the present invention. Detailed implementation manners

[0088] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0089]

Energy storage system structure

[0090] Embodiment 1

[0091] Referring to Figure 1 and Figure 2 shown, an energy storage system includes:

[0092] An inverter device 100, which includes a housing 10 and an inverter 11 located within the housing 10;

[0093] At least one first battery pack 200, which is configured to be detachably mounted to the housing 10;

[0094] At least one second battery pack 300, one of which is configured to be detachably mounted to the housing 10, and the remaining second battery packs 300 can be arranged in a stacked manner with the second battery pack 300 mounted to the housing 10;

[0095] The inverter 11 is configured to receive and generate an AC power output from the first battery pack 200 and / or the second battery pack 300; wherein,

[0096] The second battery pack 300 is different from the first battery pack 200;

[0097] When both the first battery pack 200 and the second battery pack 300 are mounted to the housing 10, the second battery pack 300 is adapted to charge the first battery pack 200 through the inverter device 100.

[0098] Of course, the inverter device 100 also has a charging interface and a discharging interface suitable for user contact and use. The charging interface includes an AC charging port for connecting and receiving external AC power and a solar charging interface. The discharging interface includes an AC discharging port 14 and a DC discharging port. The AC discharging port 14 outputs the AC power inverted and output by the inverter 11.

[0099] In addition, an installation portion 12 for detachably mounting and connecting the first battery pack 200 is further provided on the housing 10 of the inverter device 100. The installation portion 12 includes a latch connection portion and an electrical connection terminal. When the first battery pack 200 is inserted into the installation portion 12, a latch connection is formed with the first battery pack 200 through the latch connection portion. At the same time, the discharging terminal of the first battery pack 200 forms an electrical connection and cooperation with the corresponding electrical connection terminal. Of course, regarding the latch connection portion, an unlocking button is further provided on the first battery pack 200. When it is necessary to disassemble the first battery pack 200, the unlocking button is operated and pressed, and the first battery pack 200 is unlocked from the latch connection portion, and the user can disassemble and pull out the first battery pack 200 from the installation portion 12.

[0100] In addition, the second battery pack 300 is configured to be detachably mounted to the housing 10. Specifically, in the present Embodiment 1, the second battery pack 300 is detachably mounted at the bottom of the housing 10. In short, the second battery pack 300 serves as a base, and the inverter device 100 is stacked on top of the second battery pack 300.

[0101] More specifically, as shown in Figure 3 , the second battery pack 300 has an unlocking button 30, a latch 31, a positioning groove 32, and an electrical connection interface 33, such as a male plug. Operating the unlocking button 30, for example, pressing the unlocking button 30 can actuate the latch 31;

[0102] Correspondingly, as shown in Figure 4 , the inverter device 100 has a latch slot corresponding to the latch 31, a positioning foot corresponding to the positioning groove 32, and a power receiving interface corresponding to the electrical connection interface 33, such as a female socket corresponding to the male plug. Through the male-female plug-in configuration corresponding to the male plug and the female socket, the electrical connection between the second battery pack 300 and the inverter device 100 is achieved.

[0103] It is also worth mentioning that there are multiple second battery packs 300. The multiple second battery packs 300 are stacked on top of each other and remain connected in parallel. At this time, the second battery pack 300 is also provided with a parallel interface 34. They are electrically connected to each other through the electrical connection interface 33 of one second battery pack 300 and the parallel interface 34 of another second battery pack 300 to achieve parallel connection between them.

[0104] At this time, the inverter device 100 can perform inverter AC output either through the first battery pack 200 mounted to the housing 10 or through the second battery pack 300 mounted to the housing 10. The various output methods of the inverter device 100 will be described in detail below.

[0105] Any one of the first battery pack 200 or the second battery pack 300 that is detached from the housing 10 is suitable for supplying power to the first DC electrical device or the second DC electrical device, where the first DC electrical device is different from the second DC electrical device.

[0106] Specifically, the first battery pack 200 is a low nominal voltage battery pack, and its low nominal voltage is less than 40V, such as 12V, 18V, 20V, 24V, or 36V; it can be matched with DC electrical devices with a low nominal voltage, such as DC power tools, for DC power output operations, especially electric drills, screwdrivers, garden blowers, chain saws, etc.

[0107] The second battery pack 300 is a high nominal voltage battery pack, with a high nominal voltage above 40V, preferably 40V to 80V, such as 40V, 54V, 60V, 72V, and / or 80V; it can match DC electrical equipment with a high nominal voltage, such as DC power tools for DC power output operations, especially ice chippers, riding lawn mowers, electric bicycles, etc.

[0108] Furthermore, more preferably, the second battery pack 300 has a higher nominal battery capacity than the first battery pack 200. In this case, the second battery pack 300 can have the same nominal voltage as the first battery pack 200, or the nominal voltage of the second battery pack 300 is higher than that of the first battery pack 200, or even the nominal voltage of the second battery pack 300 is lower than that of the first battery pack 200. At this time, the second battery pack 300 is suitable for boosting through a DC / DC conversion module to charge the first battery pack 200.

[0109] Embodiment 2

[0110] Referring to Figure 5 and Figure 6 As shown, in addition to the first battery pack 200, a third battery pack 400 is also provided on the inverter device 100, and the second battery pack 300 continues to be connected to the inverter device 100 in the manner of Embodiment 1.

[0111] Specifically, the third battery pack 400 is different from the first battery pack 200, especially having different voltage parameters. However, it is worth mentioning that both the third battery pack 400 and the first battery pack 200 are preferably set as low nominal voltage battery packs, with a low nominal voltage less than 40V, such as 12V, 18V, 20V, 24V, or 36V. For example, the third battery pack 400 is 18V and the first battery pack 200 is 12V; the third battery pack 400 is 24V and the first battery pack 200 is 12V or 18V; the third battery pack 400 is 36V and the first battery pack 200 is 12V or 18V or 24V.

[0112] Furthermore, more preferably, the second battery pack 300 has a higher nominal battery capacity than the first battery pack 200 and the third battery pack 400, and the second battery pack 300 can charge the first battery pack 200 and the third battery pack 400.

[0113] At this time, preferably, the first battery pack 200 and the third battery pack 400 have different nominal voltages, and the second battery pack 300 may have the same nominal voltage as the first battery pack 200 or the third battery pack 400, or the nominal voltage of the second battery pack 300 may be higher than that of the first battery pack 200 or the third battery pack 400, or even the nominal voltage of the second battery pack 300 may be lower than that of the first battery pack 200 or the third battery pack 400. At this time, the second battery pack 300 is suitable for boosting through the DC / DC conversion module to charge the first battery pack 200 or the third battery pack 400. Regarding the structural design, continue to refer to Figure 6 As shown, the housing 10 of the inverter device 100 is provided with two support feet (10a, 10b). An installation part suitable for installing and connecting the third battery pack 400 is arranged between the support feet (10a, 10b), and the third battery pack 400 can be detachably installed on this installation part. The surface of the third battery pack 400 installed on the installation part does not exceed the bottommost surface of the support feet (10a, 10b).

[0114] At this time, the second battery pack 300 can charge both the first battery pack 200 and the third battery pack 400. The charging control method will be described in detail below.

[0115] Embodiment 1a

[0116] Refer to Figure 1a As shown, the structure and principle of this embodiment are basically similar to those of the above-mentioned Embodiment 1. The difference is that this embodiment further includes a fourth battery pack 500 with a relatively large nominal capacity. At this time, the nominal capacity of the fourth battery pack 500 is greater than that of the second battery pack 300, and the nominal capacity of the second battery pack 300 is greater than that of the first battery pack 200.

[0117] Preferably, the fourth battery pack 500 has the same nominal voltage as the second battery pack 300. Of course, the fourth battery pack 500 and the second battery pack 300 may also have different nominal voltages. At this time, the fourth battery pack 500 and / or the second battery pack 300 has its corresponding DC / DC conversion module.

[0118] Embodiment 2a

[0119] Refer to Figure 2a As shown, the structure and principle of this embodiment are basically similar to those of the above-mentioned Embodiment 2. The difference is that this embodiment further includes a fourth battery pack 500 with a relatively large nominal capacity. At this time, the nominal capacity of the fourth battery pack 500 is greater than that of the second battery pack 300, and the nominal capacity of the second battery pack 300 is greater than that of the first battery pack 200 or the third battery pack 400.

[0120] More preferably, the fourth battery pack 500 has the same nominal voltage as the second battery pack 300. Of course, the fourth battery pack 500 and the second battery pack 300 may also have different nominal voltages. In this case, the fourth battery pack 500 and / or the second battery pack 300 has a corresponding DC / DC conversion module.

[0121] Embodiment 1b

[0122] Refer to Figure 1b As shown, the structure and principle of this embodiment are basically similar to those of the above-mentioned Embodiment 1a. The difference lies in that: the energy storage system further includes a second inverter device 600. The above-mentioned fourth battery pack 500 is stacked and installed above the second inverter device 600. More preferably, the second inverter device 600 is provided with rollers to facilitate movement.

[0123] The above-mentioned fourth battery pack 500 stacked and installed above the second inverter device 600 can form a household energy storage system, which will be described in detail below.

[0124] The above-mentioned first battery pack 200 combined with the inverter device 100, and the second battery pack 200 can be stacked above the fourth battery pack 500 and form a parallel connection therewith, so as to expand the capacity of the household energy storage system composed of the fourth battery pack 500 and the second inverter device 600.

[0125] Embodiment 2b

[0126] Refer to Figure 2b As shown, the structure and principle of this embodiment are basically similar to those of the above-mentioned Embodiment 2a. The difference lies in that: the energy storage system further includes a second inverter device 600. The above-mentioned fourth battery pack 500 is stacked and installed above the second inverter device 600. More preferably, the second inverter device 600 is provided with rollers to facilitate movement.

[0127] The above-mentioned fourth battery pack 500 stacked and installed above the second inverter device 600 can form a household energy storage system, which will be described in detail below.

[0128] The above-mentioned first battery pack 200 combined with the inverter device 100, and the second battery pack 200 and the third battery pack 400 can be stacked above the fourth battery pack 500 and form a parallel connection therewith, so as to expand the capacity of the household energy storage system composed of the fourth battery pack 500 and the second inverter device 600.

[0129]

Charging and discharging of the energy storage system

[0130] Embodiment 1

[0131] Refer to Figure 7As shown, the inverter device 100 includes a bidirectional inverter. After being boosted by a bidirectional DC / DC converter, multiple first battery packs 200 are output-connected to a bidirectional DC / AC converter. The bidirectional DC / DC converter and the bidirectional DC / AC converter are combined to form a bidirectional inverter;

[0132] The second battery pack 300 is directly connected to the bidirectional DC / AC converter.

[0133] Regarding the inverter output of the inverter device 100

[0134] When the inverter device 100 performs inverter AC output, it can either receive the DC power of multiple first battery packs 200. After the DC power of multiple first battery packs 200 is boosted by the bidirectional DC / DC converter, it is output-connected to the bidirectional DC / AC converter for inverter AC power output, or it can receive the DC power of the second battery pack 300. The DC power of the second battery pack 300 is directly output to the bidirectional DC / AC converter for inverter AC power output. Here, it should be noted that there can be multiple second battery packs 300, such as multiple stacked second battery packs 300 proposed in the above [energy storage system structure] being connected in parallel with each other.

[0135] When the inverter device 100 receives both the first battery pack 200 and the second battery pack 300 installed at the same time, the inverter device 100 preferably selects to receive the DC power of the second battery pack 300 for inverter AC power output. When there are multiple second battery packs 300 connected in parallel, and only when all multiple second battery packs 300 output to their cut-off voltages, the inverter device 100 starts to receive the DC power of multiple first battery packs 200. At this time, the DC power of multiple first battery packs 200 is boosted by the bidirectional DC / DC converter and then output-connected to the bidirectional DC / AC converter for inverter AC power output.

[0136] Here, it should be noted that:

[0137] The inverter output power generated by the power output of a single second battery pack 300 to the inverter device 100 is equivalent to the inverter output power generated by the power output of multiple first battery packs 200 to the inverter device 100.

[0138] Regarding the charging of the inverter device 100

[0139] Charging method 1: The inverter device 100 is connected to an external AC power supply

[0140] Refer to Figure 8As shown, when the inverter device 100 is connected to an external AC power supply, the AC power of the external AC power supply is converted and rectified into DC power through a bidirectional DC / AC converter. The DC power can either be used to charge the first battery pack 200 after being stepped down by a bidirectional DC / DC converter, or directly charge the second battery pack 300.

[0141] When the inverter device 100 receives both the first battery pack 200 and the second battery pack 300 installed simultaneously, the inverter device 100 preferably chooses to charge the first battery pack 200 to quickly fully charge the first battery pack 200 with a lower nominal voltage to meet user usage, and then charges the second battery pack 300. At this time, switches controlled by the controller should be provided on the branches of both the first battery pack 200 and the second battery pack 300, which are not shown in the figure. When there are multiple second battery packs 300 connected in parallel, multiple second battery packs 300 can be charged; of course, it is also possible to choose to charge the first battery pack 200 and the second battery pack 300 alternately.

[0142] Charging method 2: The inverter device 100 is not connected to an external AC power supply

[0143] Refer to Figure 9 As shown, when the inverter device 100 is not connected to an external AC power supply, and at the same time, the inverter device 100 receives both the first battery pack 200 and the second battery pack 300 installed. When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the first battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the first battery pack 200 through the charging circuit.

[0144] The charging circuit includes a bidirectional DC / DC converter and a first switch. The bidirectional DC / DC converter and the first switch are arranged between the first battery pack 200 and the second battery pack 300. Under the condition that the first switch is closed, the second battery pack 300 is adapted to charge the first battery pack 200 after being stepped down by the bidirectional DC / DC converter.

[0145] Among them, the first power parameter is voltage or remaining battery capacity; and / or, the second power parameter is voltage or remaining battery capacity.

[0146] More preferably, the second battery pack 300 can simultaneously meet the maximum charging power of multiple first battery packs 200.

[0147] Embodiment 2

[0148] Refer to Figure 10As shown, the inverter device 100 includes a bidirectional inverter. Multiple first battery packs 200 are respectively connected to a bidirectional DC / AC converter after being boosted by corresponding bidirectional DC / DC converters one by one. The combination of the bidirectional DC / DC converter and the bidirectional DC / AC converter forms a bidirectional inverter;

[0149] The second battery pack 300 is directly connected to the bidirectional DC / AC converter.

[0150] Regarding the inverter output of the inverter device 100

[0151] When the inverter device 100 performs an inverter AC output, it can either receive the DC power of multiple first battery packs 200. The DC power of the multiple first battery packs 200 is boosted by the corresponding bidirectional DC / DC converters and then output to the bidirectional DC / AC converter for inverter AC power output. Or it can receive the DC power of the second battery pack 300. The DC power of the second battery pack 300 is directly output to the bidirectional DC / AC converter for inverter AC power output. Here, it should be noted that there can be multiple second battery packs 300, such as the multiple stacked second battery packs 300 proposed in the above [Energy Storage System Structure] being connected in parallel with each other.

[0152] When the inverter device 100 receives both the first battery pack 200 and the second battery pack 300 installed at the same time, the inverter device 100 preferably selects to receive the DC power of the second battery pack 300 for inverter AC power output. When there are multiple second battery packs 300 connected in parallel, only when all the multiple second battery packs 300 output to their cut-off voltages, the inverter device 100 starts to receive the DC power of the multiple first battery packs 200. At this time, the DC power of the multiple first battery packs 200 is boosted by the corresponding bidirectional DC / DC converters and then output to the bidirectional DC / AC converter for inverter AC power output.

[0153] Here, it should be noted that:

[0154] The inverter output power generated by the power output of a single second battery pack 300 to the inverter device 100 is equivalent to the inverter output power generated by the power output of multiple first battery packs 200 to the inverter device 100.

[0155] Regarding the charging of the inverter device 100

[0156] Charging method 1: The inverter device 100 is connected to an external AC power supply

[0157] Refer to Figure 11As shown, when the inverter device 100 is connected to an external AC power supply, the AC power of the external AC power supply is converted and rectified into DC power by the bidirectional DC / AC converter. The DC power can either be used to charge the first battery pack 200 after being stepped down by the bidirectional DC / DC converter, or directly charge the second battery pack 300.

[0158] When the inverter device 100 simultaneously receives the installation of the first battery pack 200 and the second battery pack 300, the inverter device 100 preferably chooses to charge the first battery pack 200 to quickly fully charge the first battery pack 200 with a lower nominal voltage to meet user needs, and then charges the second battery pack 300. At this time, switches controlled by the controller should be provided on the branches of both the first battery pack 200 and the second battery pack 300, which are not shown in the figure. When there are multiple second battery packs 300 connected in parallel, multiple second battery packs 300 can be charged; of course, it is also possible to choose to charge the first battery pack 200 and the second battery pack 300 alternately.

[0159] Charging method 2: The inverter device 100 is not connected to an external AC power supply

[0160] Refer to Figure 12 As shown, when the inverter device 100 is not connected to an external AC power supply, and at the same time, the inverter device 100 simultaneously receives the installation of the first battery pack 200 and the second battery pack 300. When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the first battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the first battery pack 200 through the charging circuit.

[0161] The charging circuit includes a bidirectional DC / DC converter and a first switch. The bidirectional DC / DC converter and the first switch are arranged between the first battery pack 200 and the second battery pack 300. Under the condition that the first switch is closed, the second battery pack 300 is adapted to charge the first battery pack 200 after being stepped down by the bidirectional DC / DC converter.

[0162] Wherein, the first power parameter is voltage or remaining battery capacity; and / or, the second power parameter is voltage or remaining battery capacity.

[0163] At this time, it should be noted that: the above-mentioned first switch is arranged between each second battery pack 300 and each first battery pack 200. And preferably, the second battery pack 300 can simultaneously meet the maximum charging power of multiple first battery packs 200.

[0164] Embodiment 3

[0165] Refer to Figure 13As shown, the inverter device 100 includes a bidirectional inverter, and a plurality of first battery packs 200 are directly connected to the bidirectional DC / AC converter respectively;

[0166] The second battery pack 300 is output-connected to the bidirectional DC / AC converter after being stepped down by the corresponding bidirectional DC / DC converter, and the bidirectional DC / DC converter and the bidirectional DC / AC converter are combined to form a bidirectional inverter.

[0167] Regarding the inverter output of the inverter device 100

[0168] When the inverter device 100 performs an inverter AC output, it can either receive the DC power of a plurality of first battery packs 200, and the DC power output of the plurality of first battery packs 200 is connected to the bidirectional DC / AC converter for inverter AC power output, or receive the DC power of the second battery pack 300. The DC power of the second battery pack 300 is stepped down by the bidirectional DC / DC converter and then output to the bidirectional DC / AC converter for inverter AC power output. Here, it should be noted that there can be multiple second battery packs 300, such as the multiple stacked second battery packs 300 proposed in the above [energy storage system structure] are connected in parallel with each other.

[0169] When the inverter device 100 receives both the first battery pack 200 and the second battery pack 300 installed at the same time, the inverter device 100 preferably selects to receive the DC power of the second battery pack 300 for inverter AC power output. When there are multiple second battery packs 300 connected in parallel, and only when all the multiple second battery packs 300 output to their cut-off voltages, the inverter device 100 starts to receive the DC power of the plurality of first battery packs 200. At this time, the DC power of the plurality of first battery packs 200 is directly output-connected to the bidirectional DC / AC converter for inverter AC power output.

[0170] Here, it should be noted that:

[0171] The inverter output power generated by the power output of a single second battery pack 300 to the inverter device 100 is equivalent to the inverter output power generated by the power output of a plurality of first battery packs 200 to the inverter device 100.

[0172] Regarding the charging of the inverter device 100

[0173] Charging method 1: The inverter device 100 is connected to an external AC power supply

[0174] Refer to Figure 14As shown, when the inverter device 100 is connected to an external AC power supply, the AC power of the external AC power supply is converted and rectified into DC power by the bidirectional DC / AC converter. The DC power can either be boosted by the bidirectional DC / DC converter and then used to charge the second battery pack 300, or directly charge the first battery pack 200.

[0175] When the inverter device 100 receives both the first battery pack 200 and the second battery pack 300 installed simultaneously, the inverter device 100 preferably chooses to charge the first battery pack 200 first to quickly fully charge the first battery pack 200 with a lower nominal voltage to meet user needs, and then charges the second battery pack 300. At this time, switches controlled by the controller should be provided on the branches of both the first battery pack 200 and the second battery pack 300, which are not shown in the figure. When there are multiple second battery packs 300 connected in parallel, multiple second battery packs 300 can be charged; of course, it is also possible to choose to charge the first battery pack 200 and the second battery pack 300 alternately.

[0176] Charging method 2: The inverter device 100 is not connected to an external AC power supply

[0177] Refer to Figure 15 As shown, when the inverter device 100 is not connected to an external AC power supply, and at the same time, the inverter device 100 receives both the first battery pack 200 and the second battery pack 300 installed. When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the first battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the first battery pack 200 through the charging circuit.

[0178] The charging circuit includes a bidirectional DC / DC converter and a first switch. The bidirectional DC / DC converter and the first switch are arranged between the first battery pack 200 and the second battery pack 300. Under the condition that the first switch is closed, the second battery pack 300 is suitable for charging the first battery pack 200 after stepping down through the bidirectional DC / DC converter.

[0179] Among them, the first power parameter is voltage or remaining power; and / or, the second power parameter is voltage or remaining power.

[0180] At this time, it should be noted that: the above-mentioned first switch is arranged between each second battery pack 300 and each first battery pack 200. And preferably, the second battery pack 300 can simultaneously meet the maximum charging power of multiple first battery packs 200.

[0181] Embodiment 4

[0182] Refer to Figure 16As shown, the inverter device 100 includes a unidirectional inverter. After being boosted by a unidirectional DC / DC converter, multiple first battery packs 200 are output-connected to a unidirectional DC / AC converter. The combination of the unidirectional DC / DC converter and the unidirectional DC / AC converter forms a unidirectional inverter;

[0183] The second battery pack 300 is directly connected to the unidirectional DC / AC converter;

[0184] Meanwhile, a charging bypass is configured. Multiple first battery packs 200 and the second battery pack 300 are respectively connected to the charging bypass through charging branches, and switches are provided on the charging branches.

[0185] Regarding the inverter output of the inverter device 100

[0186] When the inverter device 100 performs inverter AC output, it can either receive the DC power of multiple first battery packs 200. After the DC power of multiple first battery packs 200 is boosted by the unidirectional DC / DC converter, it is output-connected to the unidirectional DC / AC converter for inverter AC power output, or receive the DC power of the second battery pack 300. The DC power of the second battery pack 300 is directly output to the unidirectional DC / AC converter for inverter AC power output. Here, it should be noted that there can be multiple second battery packs 300, such as the multiple stacked second battery packs 300 proposed in the above [Energy Storage System Structure] are connected in parallel with each other.

[0187] When the inverter device 100 simultaneously receives the installation of the first battery pack 200 and the second battery pack 300, the inverter device 100 preferably selects to receive the DC power of the second battery pack 300 for inverter AC power output. When there are multiple second battery packs 300 connected in parallel, only when all multiple second battery packs 300 output to their cut-off voltages, the inverter device 100 starts to receive the DC power of multiple first battery packs 200. At this time, the DC power of multiple first battery packs 200 is boosted by the unidirectional DC / DC converter and then output-connected to the unidirectional DC / AC converter for inverter AC power output.

[0188] Here, it should be noted that:

[0189] The inverter output power generated by the power output of a single second battery pack 300 to the inverter device 100 is equivalent to the inverter output power generated by the power output of multiple first battery packs 200 to the inverter device 100.

[0190] Regarding the charging of the inverter device 100

[0191] Charging method 1: The inverter device 100 is connected to an external AC power source

[0192] Refer to Figure 17As shown, when the inverter device 100 is connected to an external AC power supply, the AC power of the external AC power supply is converted into DC power through a charging bypass rectification, and the DC power is used to charge the first battery pack 200 and the second battery pack 300 through corresponding charging branches respectively.

[0193] When the inverter device 100 simultaneously receives and installs the first battery pack 200 and the second battery pack 300, the inverter device 100 preferably chooses to charge the first battery pack 200 to quickly fill up the first battery pack 200 with a lower nominal voltage to meet user needs, and then charges the second battery pack 300. At this time, switches controlled by the controller should be provided on the branches of both the first battery pack 200 and the second battery pack 300. When there are multiple second battery packs 300 connected in parallel, multiple second battery packs 300 can be charged; of course, it is also possible to choose to charge the first battery pack 200 and the second battery pack 300 alternately.

[0194] Charging method 2: The inverter device 100 is not connected to an external AC power supply

[0195] Refer to Figure 18 As shown, when the inverter device 100 is not connected to an external AC power supply, and at the same time, the inverter device 100 simultaneously receives and installs the first battery pack 200 and the second battery pack 300. When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging bypass between the first battery pack 200 and the second battery pack 300 to open, and the second battery pack 300 charges the first battery pack 200 through the charging bypass.

[0196] Wherein, the first power parameter is voltage or remaining battery capacity; and / or, the second power parameter is voltage or remaining battery capacity.

[0197] More preferably, the second battery pack 300 can simultaneously meet the maximum charging power of multiple first battery packs 200.

[0198] Embodiment 5

[0199] Refer to Figure 19 As shown, the principle of this Embodiment 5 is basically the same as that of the above Embodiment 4, except that the charging bypass is provided with a first charging bypass and a second charging bypass.

[0200] Since the first battery pack 200 is different from the second battery pack 300. For example, as described above, the first battery pack 200 is a low nominal voltage battery pack, and its low nominal voltage is less than 40V, such as 12V, 18V, 20V, 24V or 36V; it can match DC electrical equipment with a low nominal voltage, such as DC power tools for DC power output operations, especially electric drills, screwdrivers, garden blowers, chain saws, etc.

[0201] The second battery pack 300 is a high nominal voltage battery pack, and its high nominal voltage is above 40V, preferably 40V to 80V, such as 40V, 54V, 60V, 72V and / or 80V; it can match DC electrical equipment with a high nominal voltage, such as DC power tools for DC power output operations, especially ice chippers, riding lawn mowers, electric bicycles, etc.

[0202] As a result, the charging voltages of the first battery pack 200 and the second battery pack 300 are inconsistent. Therefore, for the convenience of charging management of the first battery pack 200 and the second battery pack 300, a first charging bypass and a second charging bypass are respectively set to be correspondingly adapted to them.

[0203] Regarding the charging of the inverter device 100

[0204] Charging method 1: The inverter device 100 is connected to an external AC power supply

[0205] Refer to Figure 20 As shown, when the inverter device 100 is connected to an external AC power supply, the AC power of the external AC power supply is converted and rectified into DC power through the first charging bypass, and the DC power respectively charges the first battery pack 200 and the second battery pack 300 through the corresponding charging branches.

[0206] When the inverter device 100 receives both the first battery pack 200 and the second battery pack 300 installed at the same time, the inverter device 100 preferably chooses to charge the first battery pack 200 to quickly fill the first battery pack 200 with a lower nominal voltage to meet the user's needs, and then charges the second battery pack 300. At this time, switches controlled by a controller should be provided on the branches of both the first battery pack 200 and the second battery pack 300. When there are multiple second battery packs 300 connected in parallel, multiple second battery packs 300 can be charged; of course, it is also possible to choose to charge the first battery pack 200 and the second battery pack 300 alternately.

[0207] Charging method 2: The inverter device 100 is not connected to an external AC power supply

[0208] The second battery pack 300 is connected to the first charging bypass through the switch S3.

[0209] Refer to Figure 21As shown, when the inverter device 100 is not connected to an external AC power supply, at the same time, the inverter device 100 receives the first battery pack 200 and the second battery pack 300 installed. When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the switches S3 and S1 between the first battery pack 200 and the second battery pack 300 to close, and S2 to open, and the first charging bypass is turned on. The second battery pack 300 charges the first battery pack 200 through the first charging bypass.

[0210] Among them, the first power parameter is voltage or remaining power; and / or, the second power parameter is voltage or remaining power.

[0211] The second battery pack 300 is preferably capable of simultaneously meeting the maximum charging power of multiple first battery packs 200.

[0212] Embodiment 6

[0213] Refer to Figure 22 As shown, different from the above embodiment, in this embodiment, it further includes at least one third battery pack 400. As described above, the third battery pack 400 is different from the first battery pack 200, especially having different voltage parameters. However, it is worth mentioning that both the third battery pack 400 and the first battery pack 200 are preferably set as low nominal voltage battery packs, and their low nominal voltage is less than 40V, such as 12V, 18V, 20V, 24V or 36V. For example, the third battery pack 400 is 18V and the first battery pack 200 is 12V; the third battery pack 400 is 24V and the first battery pack 200 is 12V or 18V; the third battery pack 400 is 36V and the first battery pack 200 is 12V or 18V or 24V.

[0214] At this time, multiple first battery packs 200 are boosted and connected to the bidirectional DC / AC converter through the first bidirectional DC / DC converter, at least one third battery pack 400 is boosted and connected to the bidirectional DC / AC converter through the second bidirectional DC / DC converter, and the second battery pack 300 is directly connected to the bidirectional DC / AC converter.

[0215] In this specific embodiment 6, the nominal voltage U2 of the second battery pack 300 > the nominal voltage U3 of the third battery pack 400 > the nominal voltage U1 of the first battery pack 200.

[0216] When the inverter device 100 simultaneously receives the first battery pack 200, the second battery pack 300, and the third battery pack 400 and outputs inverted AC power, it is preferable to select the DC power of the second battery pack 300 for inverted AC power output. When there are multiple second battery packs 300 connected in parallel, only when all the multiple second battery packs 300 output to their cut-off voltages, the inverter device 100 starts to receive the DC power of the multiple first battery packs 200 and / or the multiple third battery packs 400. At this time, the DC power of the multiple first battery packs 200 is directly output and connected to the bidirectional DC / AC converter for inverted AC power output.

[0217] Regarding the charging of the inverter device 100

[0218] Charging method 1: The inverter device 100 is connected to an external AC power supply

[0219] Refer to Figure 22 As shown, when the inverter device 100 is connected to an external AC power supply, the AC power of the external AC power supply is converted and rectified into DC power by the bidirectional DC / AC converter. The DC power can either be stepped down by the first bidirectional DC / DC converter and then used to charge the first battery pack 200, and / or stepped down by the second bidirectional DC / DC converter and then used to charge the third battery pack 400, or directly charge the second battery pack 300.

[0220] When the inverter device 100 simultaneously receives the first battery pack 200, the second battery pack 300, and the third battery pack 400, the inverter device 100 preferably chooses to charge the first battery pack 200 to quickly fully charge the first battery pack 200 with a lower nominal voltage to meet user needs, and then charges the third battery pack 400, and finally charges the second battery pack 300. At this time, switches controlled by the controller should be provided on the branches of the first battery pack 200, the second battery pack 300, and the third battery pack 400, which are not shown in the figure. When there are multiple second battery packs 300 connected in parallel, multiple second battery packs 300 can be charged.

[0221] Charging method 2: The inverter device 100 is not connected to an external AC power supply

[0222] Continue to refer to Figure 22 As shown, when the inverter device 100 is not connected to an external AC power supply, at the same time, the inverter device 100 simultaneously receives the first battery pack 200, the second battery pack 300, and the third battery pack 400,

[0223] When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the first battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the first battery pack 200 through the charging circuit.

[0224] Similarly, when the controller detects that the first power parameter of the third battery pack 400 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the third battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the third battery pack 400 through the charging circuit.

[0225] When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold, and at the same time the first power parameter of the third battery pack 400 is lower than the first preset threshold, and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the second battery pack 300 to preferentially charge the first battery pack 200. After the charging is completed, it then charges the third battery pack 400; more preferably, the second battery pack 300 can simultaneously meet the maximum charging power of multiple first battery packs 200 and multiple third battery packs 400 and charge them simultaneously.

[0226] Wherein, the first power parameter is voltage or remaining battery capacity; and / or, the second power parameter is voltage or remaining battery capacity.

[0227] Embodiment 7

[0228] Refer to Figure 23 As shown, in Embodiment 7, the principle is basically similar to that of the above Embodiment 6. The difference lies in that the inverter device 100 includes a bidirectional inverter. Multiple first battery packs 200 and third battery packs 400 are respectively connected to the bidirectional DC / AC converter after being boosted by the bidirectional DC / DC converters corresponding to them one by one. The combination of the bidirectional DC / DC converter and the bidirectional DC / AC converter forms a bidirectional inverter;

[0229] The second battery pack 300 is directly connected to the bidirectional DC / AC converter.

[0230] Regarding the inverter output of the inverter device 100

[0231] When the inverter device 100 performs an inverter AC output, it can either receive the DC power of multiple first battery packs 200 and at least one third battery pack 400. After the DC power of the first battery pack 200 and the third battery pack 400 is boosted by the corresponding bidirectional DC / DC converter, it is output and connected to the bidirectional DC / AC converter for inverter AC power output. Or it can receive the DC power of the second battery pack 300, and the DC power of the second battery pack 300 is directly output to the bidirectional DC / AC converter for inverter AC power output. Here, it should be noted that there can be multiple second battery packs 300, such as the multiple stacked second battery packs 300 proposed in the above [energy storage system structure] are connected in parallel with each other.

[0232] When the inverter device 100 simultaneously receives the installation of the first battery pack 200, the second battery pack 300, and the third battery pack 400, the inverter device 100 preferably selects to receive the DC power of the second battery pack 300 for inverter AC power output. When there are multiple second battery packs 300 connected in parallel, only when all the multiple second battery packs 300 output to their cut-off voltages, the inverter device 100 will start to receive the DC power of the multiple first battery packs 200 and the third battery pack 400. At this time, the DC power of the multiple first battery packs 200 is boosted by the corresponding bidirectional DC / DC converter and then output and connected to the bidirectional DC / AC converter for inverter AC power output.

[0233] Regarding the charging of the inverter device 100

[0234] Charging method 1: The inverter device 100 is connected to an external AC power supply

[0235] Continue to refer to Figure 23 As shown, when the inverter device 100 is connected to an external AC power supply, the AC power of the external AC power supply is converted and rectified into DC power by the bidirectional DC / AC converter. The DC power can either be stepped down by the bidirectional DC / DC converter and then used to charge the first battery pack 200 and the third battery pack 400, or directly charge the second battery pack 300.

[0236] When the inverter device 100 simultaneously receives the installation of the first battery pack 200, the second battery pack 300, and the third battery pack 400, the inverter device 100 preferably selects to charge the first battery pack 200 or the third battery pack 400 to quickly fill up the first battery pack 200 or the third battery pack 400 with a lower nominal voltage to meet user needs, and then charge the second battery pack 300. At this time, switches controlled by the controller should be provided on the branches of the first battery pack 200 and the second battery pack 300, which are not shown in the figure.

[0237] Charging method 2: The inverter device 100 is not connected to an external AC power supply

[0238] Refer to Figure 23 As shown, when the inverter device 100 is not connected to an external AC power supply, at the same time, the inverter device 100 receives the first battery pack 200, the second battery pack 300, and the third battery pack 400. When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the first battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the first battery pack 200 through the charging circuit.

[0239] Similarly, when the controller detects that the first power parameter of the third battery pack 400 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the third battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the third battery pack 400 through the charging circuit.

[0240] When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold, and at the same time the first power parameter of the third battery pack 400 is lower than the first preset threshold, and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the second battery pack 300 to preferentially charge the first battery pack 200. After the charging is completed, it then charges the third battery pack 400; more preferably, the second battery pack 300 can simultaneously meet the maximum charging power of multiple first battery packs 200 and multiple third battery packs 400 and charge them simultaneously.

[0241] Embodiment 8

[0242] Refer to Figure 24 as shown The inverter device 100 includes a bidirectional inverter, and multiple first battery packs 200 are directly connected to the bidirectional DC / AC converter respectively;

[0243] The second battery pack 300 is connected to the bidirectional DC / AC converter after being stepped down by the corresponding first bidirectional DC / DC converter, and the third battery pack 400 is connected to the bidirectional DC / AC converter after being stepped down by the corresponding second bidirectional DC / DC converter. The bidirectional DC / DC converter and the bidirectional DC / AC converter form a bidirectional inverter in combination.

[0244] Regarding the inverter output of the inverter device 100

[0245] When the inverter device 100 performs an inverse AC output, it can either receive the DC power of multiple first battery packs 200 and third battery packs 400. The DC power outputs of the first battery packs 200 and third battery packs 400 are connected to a bidirectional DC / AC converter for inverse AC power output. Or it can receive the DC power of the second battery pack 300. The DC power of the second battery pack 300 is stepped down by a bidirectional DC / DC converter and then output to a bidirectional DC / AC converter for inverse AC power output. Here, it should be noted that there can be multiple second battery packs 300. For example, the multiple stacked second battery packs 300 proposed in the above [energy storage system structure] are connected in parallel with each other.

[0246] When the inverter device 100 simultaneously receives the installation of the first battery pack 200, the second battery pack 300, and the third battery pack 400, the inverter device 100 preferably selects to receive the DC power of the second battery pack 300 for inverse AC power output. When there are multiple second battery packs 300 connected in parallel, and only when all the multiple second battery packs 300 output to their cut-off voltages, the inverter device 100 will start to receive the DC power of the first battery pack 200 and the third battery pack 400.

[0247] Regarding the charging of the inverter device 100

[0248] Charging method 1: The inverter device 100 is connected to an external AC power supply

[0249] Refer to Figure 24 As shown, when the inverter device 100 is connected to an external AC power supply, the AC power of the external AC power supply is converted and rectified into DC power by a bidirectional DC / AC converter. The DC power can either be boosted by a bidirectional DC / DC converter and then used to charge the second battery pack 300 or the third battery pack 400, or directly charge the first battery pack 200.

[0250] When the inverter device 100 simultaneously receives the installation of the first battery pack 200, the second battery pack 300, and the third battery pack 400, the inverter device 100 preferably selects to charge the first battery pack 200 and / or the third battery pack 400 to quickly fill up the first battery pack 200 and / or the third battery pack 400 with a lower nominal voltage to meet user needs, and then charge the second battery pack 300. At this time, switches controlled by a controller should be provided on the branches of the first battery pack 200 and the second battery pack 300, which are not shown in the figure. When there are multiple second battery packs 300 connected in parallel, all the multiple second battery packs 300 can be charged; of course, it is also possible to select to charge the first battery pack 200 and the second battery pack 300 alternately.

[0251] Charging method 2: The inverter device 100 is not connected to an external AC power supply

[0252] Reference Figure 15 As shown, when the inverter device 100 is not connected to an external AC power supply, at the same time, the inverter device 100 receives the first battery pack 200, the second battery pack 300, and the third battery pack 400. When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the first battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the first battery pack 200 through the charging circuit.

[0253] Similarly, when the controller detects that the first power parameter of the third battery pack 400 is lower than the first preset threshold and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the charging circuit between the third battery pack 200 and the second battery pack 300 to be turned on, and the second battery pack 300 charges the third battery pack 400 through the charging circuit.

[0254] When the controller detects that the first power parameter of the first battery pack 200 is lower than the first preset threshold, and at the same time the first power parameter of the third battery pack 400 is lower than the first preset threshold, and the second power parameter of the second battery pack 300 is higher than the second preset threshold, the controller controls the second battery pack 300 to preferentially charge the first battery pack 200. After the charging is completed, it then charges the third battery pack 400; more preferably, the second battery pack 300 can simultaneously meet the maximum charging power of multiple first battery packs 200 and multiple third battery packs 400 and charge them simultaneously.

[0255]

Operating Mode of Energy Storage System

[0256] Embodiment 1

[0257] Reference Figure 25 As shown, the energy storage system described above can be applied to a household to form a household energy storage system, which can receive direct current from a solar panel for solar charging and storage.

[0258] Working mode of the household energy storage system:

[0259] Mode 1: Photovoltaic provides energy storage and surplus power is fed into the grid. When sunlight is sufficient, part of the electric energy generated by the solar cell array is used to meet household electricity demand, and the other part is stored in the battery pack of the energy storage system. If there is still surplus electric energy, it is transmitted to the public grid through a grid-connected inverter.

[0260] Mode 2: Photovoltaics provides energy storage and user power consumption. In this case, the electric energy generated by the solar cell array first meets the household power consumption demand, and the excess electric energy is stored in the battery pack of the energy storage system. If the battery pack of the energy storage system is also full, the excess electric energy can be transmitted to the public power grid.

[0261] Mode 3: Photovoltaics only provides partial energy storage. In this mode, the electric energy generated by the solar cell array is mainly used to meet the household power consumption demand and stored in the battery pack of the energy storage system, without transmitting electric energy to the public power grid.

[0262] In any of the above modes, the user can also separate one or more of the first battery pack 200, the second battery pack 300, and the third battery pack 400 from the energy storage system to meet the use of portable electric tools in the user's home, such as, for example, pruning machines, lawn mowers, garden blowers, electric chain saws, lawn mowers, snow blowers, electric drills, screwdrivers, grinders, etc.

[0263] Specifically, as Figure 26 shown, the user separates the first battery pack 200 from the energy storage system for use by electrical equipment of the first voltage series, especially cordless electric tools coupled to the first voltage series, such as Figure 26 the electric drills, pruning machines, electric chain saws, lawn mowers, etc. listed in; the user can also separate the third battery pack 400 from the energy storage system for use by electrical equipment of the second voltage series, especially cordless electric tools coupled to the second voltage series, such as the circular saws, lawn mowers, garden blowers, etc. listed in the figure. In addition, the user separates the second battery pack 300 from the energy storage system for use by electrical equipment of the third voltage series, especially cordless electric tools coupled to the third voltage series, such as the riding lawn mowers, riding tools, snow blowers, especially the two-step snow blower, etc. listed in the figure. In addition, the energy storage system itself can also supply AC electrical equipment for use.

[0264] Outdoor energy storage system working modes:

[0265] Mode 1: Referring to Figure 27 shown, the user carries the inverter device 100, and the first battery pack 200 and the third battery pack 400 to go out for work. The user separates the first battery pack 200 from the energy storage system for use by electrical equipment of the first voltage series, especially cordless electric tools coupled to the first voltage series. The user can also separate the third battery pack 400 from the energy storage system for use by electrical equipment of the second voltage series, especially cordless electric tools coupled to the second voltage series. In addition, the energy storage system itself can also supply AC electrical equipment for use.

[0266] Mode 2: Referring to Figure 28As shown, the user carries the inverter device 100, the first battery pack 200 and the third battery pack 400, and a second battery pack 300 to work outdoors. The user separates the first battery pack 200 from the energy storage system to supply power-consuming devices of the first voltage series for use, especially cordless electric tools coupled to the first voltage series. The user can also separate the third battery pack 400 from the energy storage system to supply power-consuming devices of the second voltage series for use, especially cordless electric tools coupled to the second voltage series. The user separates the second battery pack 300 from the energy storage system to supply power-consuming devices of the third voltage series for use, especially cordless electric tools coupled to the third voltage series, such as the ride-on mower, riding tool, snow blower, especially the two-stage snow blower, etc. listed in the figure. In addition, the energy storage system itself can also supply AC power-consuming devices for use.

[0267] When the second battery pack 300 is connected to the inverter device 100, it can also use the second battery pack 300 to charge the first battery pack 200 and the third battery pack 400.

[0268] Mode three: Refer to Figure 29 As shown, the user carries the inverter device 100, the first battery pack 200 and the third battery pack 400, and multiple second battery packs 300 to work outdoors. The user separates the first battery pack 200 from the energy storage system to supply power-consuming devices of the first voltage series for use, especially cordless electric tools coupled to the first voltage series. The user can also separate the third battery pack 400 from the energy storage system to supply power-consuming devices of the second voltage series for use, especially cordless electric tools coupled to the second voltage series. The user separates the second battery pack 300 from the energy storage system to supply power-consuming devices of the third voltage series for use, especially cordless electric tools coupled to the third voltage series, such as the ride-on mower, riding tool, snow blower, especially the two-stage snow blower, etc. listed in the figure. In addition, the energy storage system itself can also supply AC power-consuming devices for use.

[0269] When the second battery pack 300 is connected to the inverter device 100, it can also use the second battery pack 300 to charge the first battery pack 200 and the third battery pack 400.

[0270] Embodiment 2

[0271] Refer to Figure 30 As shown, the energy storage system described above can be applied to a household to form a household energy storage system, which can receive DC power from a solar panel for solar charging and storage.

[0272] Embodiment 2 is basically similar to Embodiment 1 in structure and principle, but the difference is that in Embodiment 2, the solar energy and the mains power are connected through the second inverter device 600.

[0273] Working mode of the household energy storage system:

[0274] Mode 1: Photovoltaic provides energy storage and surplus power grid connection. When sunlight is sufficient, part of the electric energy generated by the solar cell array is used to meet the household electricity demand, and the other part is stored in the battery pack of the energy storage system. If there is still surplus electric energy, it is transmitted to the public power grid through the grid-connected inverter.

[0275] Mode 2: Photovoltaic provides energy storage and user electricity consumption. In this case, the electric energy generated by the solar cell array first meets the household electricity demand, and the surplus electric energy is stored in the battery pack of the energy storage system. If the battery pack of the energy storage system is also full, the surplus electric energy can be transmitted to the public power grid.

[0276] Mode 3: Photovoltaic only provides partial energy storage. In this mode, the electric energy generated by the solar cell array is mainly used to meet the household electricity demand and stored in the battery pack of the energy storage system, without transmitting electric energy to the public power grid.

[0277] In any of the above modes, the user can also separate one or more of the first battery pack 200, the second battery pack 300, and the third battery pack 400 from the energy storage system to meet the use of portable power tools in the user's home, such as pruning machines, lawn mowers, garden blowers, electric chain saws, lawn mowers, snow blowers, electric drills, screwdrivers, grinders, etc. At this time, the user can also separate one or more of the first battery pack 200, the second battery pack 300, and the third battery pack 400 from the energy storage system, which Household energy storage system has no impact. The home energy storage system continues to operate through the fourth battery pack 500. The fourth battery pack 500 is generally a large-capacity battery pack, such as a battery pack with a nominal capacity of 5 kWh, which is generally fixed indoors at home and not carried out.

[0278] Outdoor energy storage system working mode:

[0279] Mode 1: As shown in Figure 31 When the user goes out to work with the inverter device 100, the first battery pack 200, and the third battery pack 400, the user separates the first battery pack 200 from the energy storage system for use by electrical equipment in the first voltage series, especially cordless power tools coupled to the first voltage series. The user can also separate the third battery pack 400 from the energy storage system for use by electrical equipment in the second voltage series, especially cordless power tools coupled to the second voltage series. In addition, the energy storage system itself can also supply AC electrical equipment for use.

[0280] At this time, the working state of the home energy storage system is as Figure 32 shown.

[0281] Mode 2: As shown in Figure 33 the figure, the user carries the inverter device 100, the first battery pack 200 and the third battery pack 400, and one second battery pack 300 to work outdoors. The user separates the first battery pack 200 from the energy storage system to supply electrical equipment of the first voltage series for use, especially cordless electric tools coupled to the first voltage series. The user can also separate the third battery pack 400 from the energy storage system to supply electrical equipment of the second voltage series for use, especially cordless electric tools coupled to the second voltage series. The user separates the second battery pack 300 from the energy storage system to supply electrical equipment of the third voltage series for use, especially cordless electric tools coupled to the third voltage series, such as the ride-on mower, riding tool, snow blower especially the two-stage snow blower listed in the figure. In addition, the energy storage system itself can also supply AC electrical equipment for use.

[0282] When the second battery pack 300 is connected to the inverter device 100, it can also use the second battery pack 300 to charge the first battery pack 200 and the third battery pack 400.

[0283] At this time, the working state of the home energy storage system is as Figure 34 shown.

[0284] Mode 3: As shown in Figure 35 the figure, the user carries the inverter device 100, the first battery pack 200 and the third battery pack 400, and multiple second battery packs 300 to work outdoors. The user separates the first battery pack 200 from the energy storage system to supply electrical equipment of the first voltage series for use, especially cordless electric tools coupled to the first voltage series. The user can also separate the third battery pack 400 from the energy storage system to supply electrical equipment of the second voltage series for use, especially cordless electric tools coupled to the second voltage series. The user separates the second battery pack 300 from the energy storage system to supply electrical equipment of the third voltage series for use, especially cordless electric tools coupled to the third voltage series, such as the ride-on mower, riding tool, snow blower especially the two-stage snow blower listed in the figure. In addition, the energy storage system itself can also supply AC electrical equipment for use.

[0285] When the second battery pack 300 is connected to the inverter device 100, it can also use the second battery pack 300 to charge the first battery pack 200 and the third battery pack 400.

[0286] At this time, the working state of the home energy storage system is as Figure 36 shown.

[0287] In this embodiment, those skilled in the art will understand that in Working mode of the outdoor energy storage system In the formula, when the user carries the inverter device 100, the first battery pack 200 and the third battery pack 400, and multiple second battery packs 300 to work outdoors, the home energy storage system will still maintain an effective working state.

[0288] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy storage system, characterized in that, Comprising: An inverter device (100), which includes a housing (10) and an inverter (11) located within the housing (10); At least one first battery pack (200), which is detachably mounted to the housing (10); At least one second battery pack (300), which is detachably mounted to the housing (10); The inverter (11) is configured to receive DC power from the first battery pack (200) and / or the second battery pack (300) and output AC power; wherein, The second battery pack (300) is different from the first battery pack (200); When both the first battery pack (200) and the second battery pack (300) are mounted to the housing (10), the second battery pack (300) is adapted to charge the first battery pack (200) through the inverter device (100).

2. The energy storage system according to claim 1, wherein: The second battery pack (300) is detachably mounted at the bottom of the housing (10), and the inverter device (100) is stacked on top of the second battery pack (300).

3. The energy storage system according to claim 2, wherein: There are multiple second battery packs (300), and the multiple second battery packs (300) are stacked on top of each other and remain connected in parallel.

4. The energy storage system according to claim 1, wherein: Any one of the first battery pack (200) or the second battery pack (300) that is detached from the housing (10) is adapted to supply power to a first DC electrical device or a second DC electrical device correspondingly, wherein the first DC electrical device is different from the second DC electrical device.

5. The energy storage system according to claim 4, wherein: The second battery pack (300) has a higher nominal voltage than the first battery pack (200).

6. The energy storage system according to claim 4 or 5, wherein: The second battery pack (300) has a higher nominal battery capacity than the first battery pack (200).

7. The energy storage system according to claim 1, wherein: The inverter device (100) includes a charging circuit located within the housing (10). When the controller detects that a first electrical parameter of the first battery pack (200) is lower than a first preset threshold and a second electrical parameter of the second battery pack (300) is higher than a second preset threshold, the controller controls the charging circuit to turn on, and the second battery pack (300) charges the first battery pack (200) through the charging circuit.

8. The energy storage system according to claim 7, wherein: The first electrical parameter is voltage or remaining charge; and / or, the second electrical parameter is voltage or remaining charge.

9. The energy storage system according to claim 7, wherein: The charging circuit includes a bidirectional DC / DC converter and a switch. The bidirectional DC / DC converter and the switch are disposed between the first battery pack and the second battery pack. Under the condition that the switch is closed, the second battery pack is adapted to charge the first battery pack through the bidirectional DC / DC converter.

10. The energy storage system according to claim 9, wherein: The bidirectional DC / DC converter and a bidirectional DC / AC converter are combined to form a bidirectional inverter. The first battery pack (200) or the second battery pack (300) is connected to the bidirectional DC / AC converter through the bidirectional DC / DC converter, and the other is directly connected to the bidirectional DC / AC converter.

11. The energy storage system according to claim 7, wherein: When the inverter device (100) is connected to an external AC power supply, the AC power received by the charging interface is rectified and converted into DC power through the bidirectional DC / AC converter. This DC power preferentially supplies power to charge the first battery pack (200), and after the first battery pack (200) is fully charged, it switches to supply power to charge the second battery pack (300).

12. The energy storage system according to claim 1, wherein: The inverter output power generated by the power output of a single second battery pack (300) to the inverter device (100) is equivalent to the inverter output power generated by the power output of multiple first battery packs (200) to the inverter device (100).

13. An energy storage system, characterized in that, Comprising: An inverter device (100), including a housing (10) and an inverter (11) inside the housing (10); At least one first battery pack (200) and at least one third battery pack (400), which are respectively detachably mounted on the housing (10). The first battery pack (200) and the third battery pack (400) are low-voltage battery packs with different nominal voltages; At least one second battery pack (300), which is detachably mounted on the housing (10). The second battery pack (300) is a high-nominal-voltage battery pack; The second battery pack (300) is adapted to charge the first battery pack (200) and / or the third battery pack (400) through the inverter device (100).

14. The energy storage system according to claim 13, wherein: The inverter (11) is configured to selectively receive DC electrical energy from the first battery pack (200), the second battery pack (300), and the third battery pack (400), either singly or simultaneously select multiple battery packs, and output AC electrical energy through an inverter conversion.

15. The energy storage system according to claim 13 or 14, wherein: The nominal voltages of the first battery pack (200) and the third battery pack (400) are less than 40V; the nominal voltage of the second battery pack (300) is above 40V.

16. The energy storage system according to claim 15, wherein: After any one of the first battery pack (200), the second battery pack (300), and the third battery pack (400) is disassembled and separated from the housing (10), it is suitable to be used as a power supply alone to supply power to the first DC electrical device, the second DC electrical device, or the third DC electrical device respectively; Wherein, the first, second, and third DC electrical devices are different types of electrical loads.

17. The energy storage system according to claim 13, wherein: The housing (10) of the inverter device (100) is provided with support feet (10a, 10b), and the third battery pack (400) is installed on the installation part between the support feet and does not exceed the bottom surface of the support feet after installation.

18. The energy storage system according to claim 13, wherein: When the inverter device (100) simultaneously receives and installs the first battery pack (200), the second battery pack (300), and the third battery pack (400); When inverting and outputting AC power, it preferentially selects to receive the DC power of the second battery pack (300) for inverting and outputting AC power; When connecting to an external AC power supply, it preferentially selects to charge the first battery pack (200) to quickly fully charge the first battery pack (200) with a lower nominal voltage to meet user needs, and then charges the third battery pack (400), and finally charges the second battery pack (300), Wherein, the nominal voltage U2 of the second battery pack (300) > the nominal voltage U3 of the third battery pack (400) > the nominal voltage U1 of the first battery pack (200).

19. A energy storage system, characterized in that, Comprising: An inverter device (100), which includes a housing (10) and an inverter (11) located inside the housing (10), and the inverter (11) at least includes a bidirectional DC / DC converter and a bidirectional DC / AC converter; At least one first battery pack (200), which is detachably installed on the housing (10) and is connected to the bidirectional DC / AC converter after being boosted by the bidirectional DC / DC converter; At least one second battery pack (300), which is detachably installed on the housing (10) and is directly connected to the bidirectional DC / AC converter; When the voltage of the second battery pack (300) is lower than the cut-off voltage, the inverter device (100) switches to be powered by the first battery pack (200).

20. The energy storage system according to claim 19, wherein: When the inverter device (100) is connected to an external AC power supply, it preferentially charges the first battery pack (200), and after the charging is completed, it switches to charge the second battery pack (300).

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