CN116780739A

CN116780739A - Power supply system and working system

Info

Publication number: CN116780739A
Application number: CN202310264695.3A
Authority: CN
Inventors: 吕少锋; 毋宏兵; 焦石平; 范春奎
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2022-03-17
Filing date: 2023-03-17
Publication date: 2023-09-19

Abstract

The application relates to a power supply system comprising: a battery pack system comprising a battery pack including at least 4 battery packs for alternately powering a power tool system comprising a plurality of garden-type power tools; the energy storage type charging system comprises an electric quantity storage part and an output interface; the electric quantity storage part charges the battery pack through the output interface, and the electric capacity of the electric quantity storage part is not less than 5Kwh; the ratio of the capacitance of the electricity storage part to the total capacitance of the battery pack is not less than 0.83. The power supply system utilizes the energy storage type charging system to alternately charge a plurality of battery packs, and a small amount of battery packs are used for supplying power to the electric tool, so that the electric tool can work uninterruptedly, and the working requirement of one day is met.

Description

Power supply system and working system

Technical Field

The application relates to the field of garden operation, in particular to a power supply system and a working system.

Background

In some work scenarios, such as outdoor work scenarios, it is often necessary to work uninterrupted for a longer period of time using a power tool. To achieve uninterrupted operation of the power tool, the selection of the power source is a primary consideration. In general, a power tool using fuel as a power source (hereinafter referred to as a fuel power tool) can meet long-term uninterrupted operation requirements. However, the main problems of the fuel power tool are that the exhaust gas released by the fuel power tool pollutes the environment, and the noise generated when the fuel power tool works is loud, so that the noise pollution is formed to the surrounding environment.

The electric tool has the advantages of environmental protection and cleanness, and compared with a fuel oil power tool, the electric tool has relatively low noise. Accordingly, power tools are becoming increasingly popular with power tool users. However, the main problem of the electric tool is that the battery pack has low output power and low charging speed, so that the electric tool cannot work with high power, and the energy waiting time of the electric tool is long, which affects the working efficiency of the electric tool.

Disclosure of Invention

Based on the above, the application provides a power supply system and a working system.

In a first aspect, the application provides a power supply system, which is used for providing electric quantity required by work for a garden work team, alternately charging a plurality of battery packs by using an energy storage type charging system, and supplying power to an electric tool by using a small number of battery packs to realize uninterrupted work of the electric tool, so that the workload of trimming 10-20 groups of gardens in one day is satisfied; specifically, the power supply system comprises a battery pack group, wherein the battery pack group comprises a plurality of battery packs for alternately supplying power to a power tool system carried by a garden work team, the power tool system comprises a plurality of garden-type power tools, and the weight of a single battery pack is less than 10Kg; the energy storage type charging system comprises an electric quantity storage part and an output interface; the electric quantity storage part charges the battery pack through the output interface, and the electric capacity of the electric quantity storage part is not less than 5Kwh; the ratio of the capacitance of the electricity storage part to the total capacitance of the battery pack is not less than 0.83.

In one embodiment, the battery pack comprises a first type battery pack and/or a second type battery pack, wherein the capacitance of the first type battery pack is 0.5KWh-1KWh, and the capacitance of the second type battery pack is 0.2KWh-0.3KWh.

In one embodiment, the battery pack includes a first type of battery pack, the number of the first type of battery packs being 1-6.

In one embodiment, the battery pack includes a second type of battery pack, the number of second type of battery packs being 1-6.

In one embodiment, the first type of battery pack is a hand-held battery pack and the second type of battery pack is a backpack battery pack.

In one embodiment, the capacity of the electricity storage portion is not less than 10Kwh, and the ratio of the capacity of the electricity storage portion to the total capacity of the battery pack is not less than 1.67.

In one embodiment, the capacity of the electricity storage portion is not more than 42KWh, and the ratio of the capacity of the electricity storage portion to the total capacity of the battery pack is not more than 52.5.

In one embodiment, the capacity of the electricity storage portion is not more than 20KWh, and the ratio of the capacity of the electricity storage portion to the total capacity of the battery pack is not more than 25.

In one embodiment, the average charging power of the single output interface to the single battery pack is not smaller than the average discharging power of the single battery pack to the electric tool, the average charging power is required for an effective charging time of the electric quantity of the battery pack from the full electric state to the full electric state, and the average discharging power is required for an effective discharging time of the electric quantity of the battery pack from the full electric state to the full electric state.

In one embodiment, the energy density of the charge storage portion is greater than the energy density of the battery pack.

In one embodiment, a ratio of an energy density of the electricity storage portion to an energy density of the battery pack is not less than 1.5.

In one embodiment, a ratio of an energy density of the electricity storage portion to an energy density of the battery pack is not less than 1.8.

In one embodiment, the energy density of the battery pack is 100Wh/Kg or more.

In one embodiment, the energy density of the electricity storage portion is 150Wh/Kg or more.

In one embodiment, the battery cell of the electricity storage part is a lithium iron phosphate battery or a ternary lithium battery.

In one embodiment, the battery cells of the battery pack are soft pack cells.

In one embodiment, the rated power of the electric tool is greater than or equal to 1KW and less than or equal to 3KW.

In a second aspect, the present application provides a work system comprising: the power supply system and the electric tool system; the power tool system includes at least one or more of the following tools: grass cutters, hand propelled mowers, hedge trimmers, chain saws, blowers, leaf shreds, snowplows, riding mowers, and intelligent mowers.

Drawings

FIG. 1 is a schematic view of a scenario in which a commercial garden team is working out using a vehicle-carried power tool system;

FIG. 2 is a schematic diagram of a commercial garden work team transition;

fig. 3 is a schematic view of a scenario in which a first type of battery pack provided in an embodiment of the present application provides power for a wheeled electric tool;

fig. 4 is a schematic diagram of a scenario in which a second type of battery pack provided in an embodiment of the present application provides power for a handheld electric tool;

fig. 5 is a schematic view of a scenario in which a first type of battery pack provided in an embodiment of the present application provides power for a handheld electric tool;

FIG. 6 is a schematic view of another possible installation of a battery pack according to an embodiment of the present application;

Fig. 7 is a schematic structural diagram of a charging system according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a charging system according to another embodiment of the present application;

fig. 9 is a schematic structural diagram of a charging system according to another embodiment of the present application;

fig. 10 is a schematic structural diagram of a charging system according to another embodiment of the present application;

fig. 11 is a schematic structural diagram of a charging system according to another embodiment of the present application;

fig. 12 is a schematic structural diagram of a charging system according to another embodiment of the present application;

FIG. 13 is a schematic diagram of a power tool system according to an embodiment of the present application;

FIG. 14 is a schematic view of a power tool system according to another embodiment of the present application;

fig. 15 is a schematic structural diagram of a power tool system according to another embodiment of the present application.

Detailed Description

The following detailed description of the preferred embodiments of the present application is provided in connection with the accompanying drawings so that the advantages and features of the present application will be more readily understood by those skilled in the art, and thus the scope of the present application is more clearly defined, and the following embodiments may be appropriately combined with each other. Wherein like reference numerals and signs are used to refer to like or equivalent elements throughout the various embodiments of the drawings and description.

With the acceleration of the pace of life of people, various types of power tools (such as automated home appliances, garden repair tools, DIY tools, etc.) are becoming more popular worldwide. Depending on the power source, the power tools may be classified into fuel tools and electric tools. The fuel oil tool is a tool mainly powered by crude oil such as gasoline, diesel oil and the like. The fuel oil tool has the advantages of high power and high efficiency and can continuously work for a long time, so the fuel oil power tool is often applied to the field of high power tools, such as commercial garden tools.

Commercial garden-type tools are specialized power tools designed for garden workers or gardeners, often referred to as landscape curing equipment. Commercial gardening tools are usually operated on lawns, hedges, flowers and plants, trees, gardens, etc. The variety of commercial garden-type tools is numerous and may include, for example, one or more of the following: grass cutters, lawnmowers, pruners, chain saws, blowers, leaf shredders, snowplows, and the like.

The power of commercial garden-type tools is typically high, for example, garden blower power is typically 2300W and mower power is typically 2600W. Therefore, the fuel oil is used as a power source, so that the power requirement of the commercial garden tool can be met, and the commercial garden tool can be supported to work for a long time. However, the fuel tool causes environmental pollution when in use, and the fuel tool has high noise and causes noise pollution. Accordingly, alternatives to fuel powered tools have been sought.

Electric power is an environment-friendly and clean energy source, and can be converted from renewable energy sources, so electric tools using electric power as a power source are becoming popular. Typically, the power tool is powered by a dc power source, which may be a portable power source such as a battery pack, a charging cabinet, etc., or an ac power source, which may be mains power, which may be obtained through an ac outlet. Commercial garden tools are usually equipped for garden companies, and because the garden companies are difficult to obtain an alternating current power supply when going out, in the field of commercial garden tools, if an electric tool is used for replacing a traditional fuel tool, the problem that an energy source is difficult to obtain can be solved by adopting a direct current power supply for power supply. Preferably, the battery pack can be used for supplying power to the electric tool, so that the electric tool is convenient to carry about when a working team goes out.

For fuel oil garden tools, a common working scenario is that 2-3 people form a working team to work for one day outside. When the garden team goes out to work, vehicles are used for carrying various fuel tools required by work, such as a fuel mower, a fuel blower, a fuel pruner, a fuel grass trimmer and the like. After the garden work is completed, the garden team uses the vehicle to carry various fuel tools to transfer to the next place to continue working.

When the power tool is used instead of the fuel tool, the use scene of the power tool is similar to that of the fuel tool. Specifically, as shown in fig. 1 and 2, the work team uses vehicles to carry various garden power tools required for work, such as a wheeled power tool such as a push mower 201, a smart mower 202, and a hand-held power tool such as a mower 301, a pruner 302, a blower 303, and the like, while the work team also needs to carry a dc power source such as a battery pack 101, a charging device, and the like. Wherein the charging device may charge the battery pack 101. When the garden electric tool works, a working team firstly goes to the first garden and works by using various carried garden electric tools. For garden trimming work, mowing work is typically the longest time consuming, and although the lawn sizes are not uniform from household to household, mowing work takes 20-40 minutes on average. Thus, one worker immediately begins mowing with the mower per garden. During mowing, another worker can sequentially complete other types of work by using the handheld electric tool, such as the other worker can mow grass, prune, blow grass again, complete all work almost simultaneously, and then the work team is transferred to the second garden. This is cycled until one day of work is completed.

As a specific example, as shown in fig. 1, the charging device may be an energy storage charging system 400. The energy storage capacity of the energy storage charging system 400 is much greater than the energy storage capacity of a single battery pack. The gardens team can be full of energy storage charging system 400 at night to carry energy storage charging system 400 when going out the during daytime, so that during operation energy storage charging system 400 has electricity at any time, can in time supply electricity for electric tool.

In order to enable the electric tool to achieve the power of the fuel oil tool, the battery pack needs to meet the power requirement of the commercial garden tool, for example, the output power of the electric grass trimmer needs to be more than 1200W for a standard fuel oil type blower, the output power of the electric blower needs to be 1500W-3000W, and the power of the electric grass trimmer needs to be 2000W-3000W for a standard fuel oil type mower.

According to the battery pack provided by the application, the continuous discharge current of the single battery cells in the battery pack is not less than 20A in the discharge process. Typically, the voltage platform of the cell components in the battery pack is 60V, i.e., the nominal voltage of the battery pack is 60V. Therefore, when the discharging current of the single battery core is not less than 20A, the output power of the battery pack is not less than 1200W, and the power requirement of the commercial electric gardening tool can be met.

Optionally, the continuous discharge current of the single battery cell in the battery pack is not less than 40A. When the nominal voltage of the battery pack is 60V, the output power of the battery pack is not less than 2400W, and the power requirements of high-power electric tools such as an electric mower and an electric blower can be met.

Optionally, the continuous discharge current of the single battery cell in the battery pack is not less than 60A, 70A, 80A or 100A.

In other embodiments, the nominal voltage of the battery pack is not limited to 60V, for example, the nominal voltage of the battery pack may also be 20V, 36V, 48V, 96V, etc. Because the continuous discharge current of the single battery core in the battery pack is larger, the battery pack can still meet the requirement of the high-power electric tool even if the nominal voltage of the battery pack is lower. For example, when the nominal voltage of the battery pack is 20V, the output power of the battery pack is not less than 1200W because the continuous discharge current of the unit cells is not less than 60A. Therefore, the battery pack provided by the application can meet the high power requirement of the electric tool due to the fact that the discharging current of the single battery core is larger. Currently, the nominal voltage of the battery pack is typically 60V, and thus the present application is illustrated with respect to a 60V voltage platform battery pack.

Since users of commercial garden tools are operators of garden companies, the purpose of using commercial garden tools is to increase profits. Based on the common working scene of the commercial garden tool, the commercial garden tool has high requirements on output power and working efficiency. The power tool needs to perform a sufficient number of works in a unit time and needs to be able to work continuously during a working time of one day. Accordingly, there is a need for a continuous energy supply for commercial garden power tools.

Therefore, when the electric tool is used instead of the conventional fuel tool, there is also a need to consider improvement in the working efficiency of the electric tool. In addition to improving the working efficiency by using a high-power electric tool, on the other hand, it is also required to reduce the energy supply time of the electric tool, so that the electric tool does not need to wait for energy, i.e., the electric tool is continuously supplied with energy, to realize uninterrupted operation of the electric tool. Based on this, two ways can be used to provide energy supply for the electric tool, the first way of energy supply is: the working team carries all the energy required for working on the outside for one day; the second energy supply mode is as follows: the work team carries part of the energy and supplements electricity in the middle.

For the first energy supply mode, the following specific energy supply scheme can be proposed:

as a first example, a battery pack may be carried with sufficient power to support the power required for one day of operation, the battery pack having a capacity to support multiple power tools for one day of operation. In a typical use scenario, the battery pack first powers the mower, which may be an intelligent mower, a hand propelled mower, or the like. After the mowing operation is finished, the battery pack continues to supply power to the mowing machine so as to execute the mowing operation. After the grass cutting operation is finished, the battery pack supplies power to the pruning machine so as to execute the pruning operation. After the pruning work is finished, the battery pack supplies power to the blower so as to complete the blowing work.

As a second example, each power tool required for garden work may be configured with one battery pack sufficient to support one day of work, for example, a garden power tool system including a mower, a lawnmower, a pruner, and a blower may carry four battery packs, the energy of which may support the mower, the lawnmower, the pruner, and the blower, respectively, without requiring a change of power for one day of work.

As a third example, a plurality of battery packs sufficient to support one-day operation may be provided for the garden power tool system, wherein one part is a working battery pack and the other part is a backup battery pack. For example, the garden electric tool system includes a mower, a grass trimmer, a pruning machine and a blower, and then a working battery pack can be configured for each electric tool, and then a sufficient number of standby battery packs are configured for each electric tool. The total capacity of the working battery pack and the backup battery pack is sufficient to support uninterrupted operation of the corresponding power tool for one day outside.

For the second energy supply mode, a plurality of battery packs can be configured for the electric tool system according to different use scenes, and the plurality of battery packs are charged in a wheel flow mode for the electric tool system to use. The plurality of battery packs are divided into two groups, one group is a working battery pack and the other group is a standby battery pack. When the working battery pack is installed on the electric tool for discharging, the standby battery pack is charged, before the working battery pack is emptied, the standby battery pack is fully charged, then the standby battery pack is installed on the tool for supplying power to the tool, and the working battery pack is charged, so that the working battery pack is alternately circulated to realize uninterrupted power supply. For example, if the power tool system includes a mower, a pruner, and a blower, and the work team is two people (worker a and worker B), where worker a completes mowing work with the mower, worker B completes other work with the mower, pruner, and blower, two sets of battery packs may be configured for work of worker a, one set as a work battery pack, one set as a backup battery pack, two sets of battery packs configured for work of worker B, one set as a work battery pack, and one set as a backup battery pack. When the electric quantity of the working battery pack is exhausted, the standby battery pack is used for supplying power, and the working battery pack is charged, so that the two battery packs can supply power uninterruptedly in turn. In this example, four battery packs, two of which are working battery packs and two of which are backup battery packs, may be provided for the worker a and the worker B. As another example, when the charging speed of the battery packs is slow, six battery packs or more may be configured for the worker a and the worker B, with a part for supporting the work of the worker a and another part for supporting the work of the worker B.

Both of the above energy supply modes can realize uninterrupted operation of the electric tool system, but commercial garden tools are usually provided for garden companies, and the use cost is a factor that must be considered by the commercial tools due to the commercial nature thereof. Meanwhile, the convenience of operation is also one of the considerations, and if the battery pack is too large and heavy, the operation is inconvenient, and the working efficiency is also affected.

The first energy supply method requires a battery pack configuration that requires a sufficient capacity of the battery pack or a sufficient number of battery packs to support uninterrupted operation of the power tool on an outside day. In the prior art, the capacity of the single battery cells commonly seen in the market is generally smaller (generally less than 5 Ah). To increase the capacity of the battery pack, it is easily conceivable to increase the number of individual cells in the battery pack, which would undoubtedly increase the volume and weight of the battery pack, which would cause inconvenience in operation, for the first and second examples of the power supply modes shown, in which the weight and volume of the battery pack are too large, whether mounted on the electric tool or carried on the back of the user. While carrying a large number of battery packs in the third example results in a high cost of use of the power tool, and an excessive number of battery packs is inconvenient to carry.

The second energy supply mode is used for configuring a limited number of battery packs for the electric tool system according to the use scene of the commercial garden electric tool and the number of workers in a garden team, the battery packs can be charged and discharged in turn to supply power for the electric tool system, the use cost of the electric tool system is low, and the number of the battery packs is less and the electric tool system is convenient to carry.

Therefore, the second energy supply mode is preferable to supply power to the electric tool system, in combination with the use cost and the use convenience. This requires that the charge rate of the battery pack be sufficiently fast that the spare battery pack can be charged before or when the discharge of the battery pack on the power tool is completed.

Considering that if a user needs to use the electric tool for long-time work outdoors or in the occasion without a commercial power socket, once the electric quantity of the battery pack is used up, the work is forced to stop because the electric quantity cannot be timely supplemented. The embodiment of the application adopts a different problem solving idea, and the problem solving idea enables the electric tool to have the capability of continuously working for a long time (such as 1 day) by reasonably designing a set of working system and working method, and the user of the electric tool does not worry about the problem of insufficient electric quantity supply in the period. The problem solving thought is helpful for truly realizing the comprehensive conversion from the fuel power tool to the electric tool.

The application provides a power supply system, which comprises a battery pack system and an energy storage type charging system, wherein the energy storage type charging system is used for charging the battery pack system, and the battery pack system comprises at least two battery packs and is used for alternately supplying power to an electric tool system.

When the battery pack system comprises N standby battery packs, the total charging speed of the N standby battery packs is greater than or equal to the discharging speed of one working battery pack, namely N is greater than or equal to V, N is an integer greater than or equal to 1, V is the charging speed of the battery packs, and V is the discharging speed of the battery packs. The charge and discharge speed of the battery pack depends on the charge and discharge multiplying power of the battery pack, so that the formula can be converted into N.times.C charge and C discharge, wherein C charge is the charge multiplying power of the battery pack, and C discharge is the discharge multiplying power of the battery pack. When the number of the backup battery packs is 1 (i.e., n=1), that is, the electric power tool includes one working battery pack and one backup battery pack, the charging speed of the backup battery pack is required to be equal to or greater than the discharging speed of the working battery pack. When the number of the backup battery packs is plural (i.e., N > 1), it is required that the total charge speed of the plurality of backup battery packs is greater than the discharge speed of one working battery pack. For example, when N is 2, that is, the charging speed of two standby battery packs is greater than or equal to the discharging speed of one working battery pack, the electric tool needs to be configured with three battery packs to realize uninterrupted operation. When a battery pack is mounted on the electric tool, after the discharge of the battery pack is finished, a battery pack No. two is mounted on the tool and is charged, after the discharge of the battery pack No. two is finished, a battery pack No. three is mounted on the electric tool and is charged, at this time, the battery pack No. one and the battery pack No. two are both charged, before the discharge of the battery pack No. three is finished, the battery pack No. one is full, so that after the discharge of the battery pack No. three is finished, the battery pack No. one can be mounted on the electric tool, and the electric tool can work uninterruptedly. In order to reduce the use cost of the battery pack, and make the garden team go out and carry conveniently at the same time, preferably, the smaller the value of N is, the better the number of the carried standby battery packs is, which requires the charging rate of the battery pack to be equal to or greater than the discharging rate. It will be appreciated that the working battery pack and the backup battery pack mentioned in this example are the same specification battery packs, and when the battery packs are mounted on the electric tool for supporting the electric tool to work, the battery packs are the working battery packs, and the remaining battery packs are the backup battery packs.

According to the embodiment of the application, the maximum continuous charging multiplying power and/or the maximum continuous discharging multiplying power of the single battery core in the battery pack are designed to be not less than 3C, so that the charging speed/discharging speed of the battery pack is obviously improved. The maximum continuous charging rate refers to the maximum charging rate that the battery pack can always maintain in the continuous charging process from the empty state to the full state. The maximum sustained discharge rate refers to the maximum discharge rate that the battery pack can always maintain during sustained discharge from the full-charge state to the empty-charge state. That is, the battery pack can be charged at a charge rate of not less than 3C all the time in the continuous charging process, and the battery pack can be discharged at a discharge rate of not less than 3C all the time in the continuous discharging process. In the present application, the empty state of the battery pack refers to a state in which the SOC (state of charge) of the battery pack is 5% or less of the rated capacity of the battery pack, and the full state of the battery pack refers to a state in which the SOC of the battery pack is 95% or more of the rated capacity of the battery pack.

Specifically, the smaller the internal resistance of the single battery cell, the higher the charge/discharge rate of the single battery cell, so in order to improve the charge rate and/or discharge rate of the single battery cell, the single battery cell with small internal resistance can be customized. In addition, the single battery cell with small internal resistance can reduce the temperature rise of the battery pack in the charging and discharging processes. As one example, the rated voltage of the battery pack may be designed to be not less than 40V while the maximum sustained charge rate and the maximum sustained discharge rate of the battery pack are both designed to be not less than 4C. As another example, the maximum sustained charge rate and the maximum sustained discharge rate of the battery pack may also be configured to be both not less than 5C. The design mode can ensure that the battery pack can support high-power charging and high-power discharging. Therefore, by adopting the design, the battery pack can be charged and discharged quickly in the working process, so that the whole working system can work continuously with higher efficiency.

The battery pack provided by the application adopts the soft pack battery core, specifically can be a type-II battery core, and can meet the 10C charge and discharge requirements, so that the battery pack can be charged and discharged quickly in the working process, the energy density of the battery pack is more than or equal to 100Wh/Kg, and further, the energy density of the battery pack can be 130Wh/Kg.

As shown in fig. 3 and 4, the present application provides two types of battery packs, namely, a first type of battery pack 101 and a second type of battery pack 102, based on diversity of garden tool types and convenience of use. Wherein the capacity of the first type battery pack 101 is greater than the capacity of the second type battery pack 102. The first type battery pack 101 is used for supplying power to large-sized and high-power electric tools, such as a wheeled electric tool 200, including a hand mower 201, an intelligent mower 202, a riding mower 203 and the like, and the first type battery pack 101 can be directly installed on the wheeled electric tool 200 when in use, so that a user does not need to directly bear the weight of the battery pack. The second type battery pack 102 is used for supplying power to the hand-held electric tool 300, such as the grass trimmer 301, the pruning machine 302, the blower 303 and the like, the second type battery pack 102 can be directly mounted on the hand-held electric tool 300, and a worker does not need to supply power to the hand-held electric tool 300 through a cable when using the hand-held electric tool 300, so that the hand-held electric tool is more convenient to use. The garden team can be pre-installed with the second type battery pack 102 for each portable hand-held power tool 300 when going out, so that the hand-held power tool can be switched to another hand-held power tool without installing the battery pack, and the hand-held power tool can be directly used, thereby being more in line with the use habit of workers when using the traditional fuel tools. Illustratively, the hand-held electric tool 300 of the garden electric tool system comprises a grass trimmer 301, a pruning machine 302 and a blower 303, wherein before each garden team works, a second type of battery pack 102 can be arranged for each of the grass trimmer 301, the pruning machine 302 and the blower 303 in advance, and after the grass trimming work is finished, a worker can directly use the pruning machine 302 to carry out the pruning work without arranging the battery pack for the pruning machine 302; after the pruning work is finished, the blower 303 is directly used for blowing work, and a battery pack is not required to be arranged for the blower 303.

Of course, when the area of the working area is larger, the first type battery pack 101 may be used to supply power to the handheld electric tool 300, so as to prolong the working time of the handheld electric tool 300 and reduce the battery pack replacement frequency. As shown in fig. 5, in this embodiment, the battery pack system further includes a carrying device 103, the first type battery pack 101 is detachably mounted on the carrying device 103, the carrying device 103 further includes a power cord 104, one end of the power cord 104 is provided with a power interface 105, and the hand-held electric tool 300 is provided with a tool end interface that is matched with the power interface 105, and the first type battery pack 101 can be connected with the hand-held electric tool through the power cord 104 and the power interface 105 to supply power to the hand-held electric tool 300. Illustratively, the first type of battery pack 101 is first connected to the grass trimmer 301, and the staff member performs the grass trimming work using the grass trimmer 301. After the grass cutting work is completed, the grass cutting machine 301 is disconnected from the first-type battery pack 101, then the pruning machine 302 is connected to the first-type battery pack 101, and the pruning machine 302 starts to work. After the pruning work is completed, the pruner 302 is disconnected from the first-type battery pack 101, and the blower 303 is connected to the first-type battery pack 101, and the blower starts to work.

It should be noted that, the battery pack is not necessarily discharged continuously with a large current in the discharging process, and the discharging current of the battery pack can be set according to the requirement of the electric tool in actual operation. For example, the battery pack may be discharged with a large current when it is full, with a small current when it is discharged to a low voltage, or with a constant current at a certain current value. In addition, the electric tool does not work constantly with rated power in the operation process, and can correspondingly change according to working conditions, and in most gardening operations, the average output power of a plurality of electric tools is about 1800W, so that the average discharge current of the battery pack group is not less than 30A, and the average output power of the battery pack group is not less than 1800W, and the requirements of most gardening operations can be met.

The battery pack provided by the application has the advantages that the capacity of the battery pack is designed comprehensively from the aspects of the weight, endurance, power and user habit of the battery pack. Firstly, the weight of the battery pack cannot be excessively heavy, so that the use comfort is not affected when the battery pack is mounted on the electric tool or carried on the back of a user; secondly, the battery pack can be replaced with low frequency after being mounted on a high-power garden electric tool by continuous voyage; and the battery pack is mounted on the electric tool, so that the electric tool is convenient to use, and the use habit of workers when using the traditional fuel oil tool can be met. When the garden team uses the traditional fuel oil tools, all the carried fuel oil tools can be filled with source oil before going out, so that the garden team can be directly used every time the tools are switched, and the tools do not need to be loaded before being used.

The first type of battery pack of the present application may be mounted on a hand propelled mower, an intelligent mower, or a riding mower for powering the mower. Or the portable electric tool can be arranged on a carrying device, and a user can carry the portable electric tool on the back for use to supply power for the portable electric tool.

The embodiment of the application adopts a separated design for the battery pack and the back frame, namely, the back frame (the back frame can also be a part of the working system) is detachably connected with the battery pack. Taking fig. 5 as an example, the battery pack 101 and the back frame 103 may be separated from each other or may be assembled together. When it is desired to use the first type of battery pack 101 to power a certain hand-held power tool (e.g., the pruner 302, the mower 301, the blower 303, etc. in fig. 4), the battery pack 101 may be mounted to the back frame 103 and then electrically connected to the hand-held power tool through the interface 105 on the back frame 103. When it is desired to use the battery pack as a non-hand-held power tool, the battery pack is mounted to a battery pack mounting portion of the power tool, thereby supplying power to the non-hand-held power tool. The battery pack may be mounted to the mower in the manner shown in fig. 6 and then the worker may push the mower to perform the mowing operation. The battery pack and the back frame are separated, so that the battery pack can be installed on the electric tool to work, and the electric tool can be supplied with power through the back frame, and the use mode of the battery pack is more flexible.

In garden tool operations, such as mowers, chain saws, blowers and the like, a human body is required to carry tools and a battery pack for outdoor work, so that the volume and the weight of the battery pack are greatly limited, and a 10kg backpack type battery pack is the maximum weight born by a person in long-time operation; the capacity of the first type of battery pack can reach 1Kwh at maximum due to the influence of the volume and the weight of the battery pack. Because the first type battery pack is usually high-power electric power supply, if the duration is too short, the battery pack is frequently replaced, and the use experience is affected, therefore, the capacity of the first type battery pack is not less than 0.5Kwh, and at least the condition that a mower and a blower work continuously for 10 minutes at 3kw power can be satisfied.

The second type of battery pack 102 may be mounted directly on the hand-held power tool 300 such as a mower 301, a pruner 302, or a blower 303 for powering the hand-held power tool 300. The second type battery pack needs to be held in hand for work, and the weight of the second type battery pack is not more than 3kg, so that the maximum capacity of the second type battery pack can reach 0.4Kwh. Similar to the first type battery pack, the second type battery pack supplies power for the low-power electric tool, and the capacity of the second type battery pack is not less than 0.2Kwh, so that the second type battery pack can at least meet the requirement that a grass cutting machine, a pruning machine and the like continuously work for 10min with the power of 1.2 kw.

Therefore, the capacity design of the battery pack not only can support the high-power electric tool to work, but also enables staff to meet the use habit of the traditional fuel oil tool without switching energy sources when the handheld electric tool is replaced by designing a second type battery pack with smaller capacity for the handheld electric tool.

In the embodiment of the application, the energy storage type charging system stores electric energy (or electric quantity) therein. If the working system adopts the energy storage type charging system, the battery pack system alternately supplies power to the electric tool system, and the process of scheduling electric quantity between the energy storage type charging system and the electric tool system by taking the battery pack system as a medium can be understood. Because the electric quantity stored by the energy storage type charging system can be far greater than the electric quantity which can be contained by the battery pack system, the power supply requirement of the electric tool system in a longer time can be met by utilizing the energy storage type charging system to supply power to the electric tool system, and because the battery pack is not large in capacity requirement, when the battery pack is installed on the electric tool, the weight of the electric tool is not too heavy, and the long endurance time and the light weight of the electric tool system can be achieved through the matched power supply of the energy storage type charging system and the battery pack. The structure of the stored energy charging system is illustrated in more detail below in connection with fig. 7-12.

As shown in fig. 7, the energy storage charging system may include an electricity storage portion 41, a first power conversion portion 42, and an output interface 43.

The power storage section 41 may be used to store power. For example, the power storage portion 41 may store power using an energy storage component (or an energy storage medium). The energy storage component may include, for example, one or more of the following types of energy storage components: ternary lithium batteries, lead-acid batteries, super-capacitors, lithium iron phosphate batteries, and hydrogen fuel cells.

In some embodiments, the power storage 41 may include one or more battery cells. If the power storage unit 41 includes a plurality of cells, the plurality of cells may be connected in series, may be connected in parallel, or may have a part of the cells connected in series and a part of the cells connected in parallel.

The power storage section 41 may include a battery management system in addition to the battery cells to manage the battery cells. For example, the battery management system can detect the state of the battery cell and prevent the battery cell from being overcharged or overdischarged.

The electric quantity which can be accommodated by the electric quantity storage part 41 is not particularly limited in the embodiment of the application, and can be configured according to actual needs. For example, the electricity storage portion 41 may be configured such that the electricity of the electricity storage portion 41 can satisfy the electricity demand of the electric power tool system for one day of work outside. The embodiment of the present application can enable the power tool system to continuously operate for a long period of time, and if the power of the power storage portion 41 can meet the power requirement of the power tool system for one day when the power tool system is operated outside, the power tool system can continuously operate for one day. Thus, the user can use the electric power tool system for work for one day outside without fail, and after waiting for work, the electric power storage unit 41 can be charged with electric power at night.

The charge storage 41 may include a single cell. The charging rate and the discharging rate of the single battery cell can be determined according to the requirement of the charging and discharging speed of the charging system 4. The charge storage unit 41 requires relatively low real-time performance of charge and discharge with respect to the battery pack. Therefore, in some embodiments, the charge-discharge rate of the individual cells in the electricity storage portion 41 may be set lower, thereby reducing the cost of the cells.

In order to support the electric tool to work under high power, the battery core of the battery pack is preferably a battery core with small internal resistance so as to meet the requirement of higher charge-discharge multiplying power. Therefore, the charge-discharge rate of the single cells in the electricity storage portion 41 is set to be lower, for example, set to be smaller than the charge-discharge rate of the single cells in the battery pack, so that the two types of cells can be mutually matched for use, and the cell cost of the whole system is lower.

The rated voltage (or voltage plateau) of the electricity storage portion 41 may be set according to actual needs. For example, the rated voltage of the electricity storage portion 41 may be designed to be not less than 48V. Of course, the rated voltage of the electricity storage portion may be designed to be not less than 80V.

Because the electric quantity stored in the electric quantity storage part is far greater than the electric quantity stored in the battery pack, when the electric quantity storage part charges the battery pack with the power of 5KW, the discharging power of the electric quantity storage part is only 1C, and the capacity of the battery pack is far less than the capacity of the electric quantity storage part, and when the capacity of the battery pack is 500WH, the charging power of 5KW can support the battery pack to charge rapidly with the charging multiplying power of 10C. Therefore, even when the discharge rate of the charge storage portion is low, the battery pack can be supported for rapid charge at a high rate. And then the electric core type of electric quantity storage part can be different from the electric core of battery package electric core type difference, specifically, the electric core internal resistance of electric quantity storage part can be greater than battery package electric core internal resistance to can reduce the cost of electric quantity storage part.

The first power conversion portion 42 may be electrically connected to the power storage portion 41. For example, the first power conversion portion 42 may establish a power and communication control connection with the electricity storage portion 41 through the wire harness 3 as shown in fig. 7.

The first power conversion part 42 may be used to convert the amount of electricity stored in the electricity storage part 41 into a first charging power suitable for charging the battery pack. For example, the first power conversion part 42 may include a DC/DC converter that may convert the direct current power output from the charge storage part 41 into direct current power suitable for charging the battery pack. The first power conversion section 42 may include one DC/DC converter or a plurality of DC/DC converters. When the first power conversion section 42 includes a plurality of DC/DC converters, the plurality of DC/DC converters may be of an electrically isolated design or may be of an electrically non-isolated design.

The output interface 43 may be electrically connected with the first power conversion section 42. As shown in fig. 7, the output interface 43 may be electrically connected to the first power conversion portion 42 through the wire harness 4. The output interface 43 may output the first charging power to the outside to charge the battery pack.

The output interface 43 may charge one battery pack or may charge a plurality of battery packs at the same time. As mentioned previously, the battery packs in the battery pack system may include multiple sets of battery packs. Assuming that output interface 43 is capable of supporting simultaneous charging of N battery packs, in some embodiments, the number of N may be set to be no less than the number of battery packs contained per group of battery packs.

Output interface 43 may include one charging channel or may include multiple charging channels, each of which may be used to charge a battery pack. The charging path may charge the battery pack with direct current, and thus, the charging path may also be referred to as a direct current charging path.

The connection manner of the output interface 43 and the battery pack is not particularly limited in the embodiment of the present application. As one example, as shown in fig. 7, the output interface 43 may provide an external harness 5 (which may include harnesses 5-1 through 5-N) to the outside. The output interface 43 charges the battery pack through the external harness 5.

As another example, output interface 43 may be first electrically connected to one or more charging bins 46 (which may include charging bin 46-1 through charging bin 46-N) via wire harness 5. The number of charging bins 46 may be two, for example. The setting of storehouse that charges makes battery package can conveniently install charging system 4 and charge, and whole process safe and reliable. In addition, the design of the charging bin is also beneficial to saving the space occupied by the charging system 4.

A control module may be provided inside the output interface 43. The control module can be electrically connected with a power interface and a communication interface in the charging bin 46 through the wire harness 5, so that power and communication control is performed on the charging process of the battery pack. For example, the output interface 43 may be configured to communicate with the battery pack within the charging bin 46 via the control module one or more of the following: communication protocol interaction, charging process control, charging protection, etc.

A trigger interface may be provided within the charging cartridge 46. The triggering interface can be used for identifying whether the object placed in the charging bin is a battery pack or not, and triggering the charging system 4 to charge the battery pack when the object placed in the charging bin is confirmed to be the battery pack.

The charging bin 46 may provide wired charging of the battery pack. Alternatively, in some embodiments, the charging bin 46 may also wirelessly charge the battery pack. The wireless charging can reduce the number of wire harnesses in the charging system 4 and reduce the weight of the charging system 4, thereby making the connection of the battery pack and the charging bin 46 simpler.

In order to improve the charging speed of the battery pack, a single battery cell with larger charging multiplying power can be configured for the battery pack, so that the battery pack can be charged with large multiplying power. In the high-rate charging process, since the charging current of the battery pack is large, if the temperature of the battery pack during the charging process is not controlled, the temperature of the battery pack may be high. The higher temperature of the battery pack causes problems in both aspects. In the first aspect, during charging, if the temperature of the battery pack exceeds a preset temperature threshold, the charging system 4 may enter a charging protection state. Once in the charge-protected state, the charging process of the battery pack is forced to stop. In the second aspect, if the temperature of the battery pack is high after the end of the charge, the battery pack may need to wait for the temperature of the battery pack to drop before starting the discharging process of the battery pack. Both of these problems can cause a break in the operation of the work system.

To avoid the above problem, a temperature control function may be added to the charging bin 46, so that the charging bin 46 can control the temperature of the battery pack during the charging process. For example, heating means and/or heat dissipation means may be provided within the charging bin 46. The heating device and/or the heat dissipation device can dynamically control the ambient temperature of the battery pack in the charging and discharging process of the battery pack, ensure that the battery pack can be continuously charged, and also ensure that the battery pack can immediately start discharging the electric tool after the charging is finished.

With continued reference to fig. 7, in some embodiments, the charging system 4 may also include an input interface 44. The input interface 44 may be used to receive input power (i.e., power externally input to the charging system 4).

The source of the input power is not particularly limited in the embodiment of the application. The input interface 44 may be used to draw power from a dc power source and/or an ac power source. For example, input interface 44 may support receiving input power from one or more of a domestic and foreign utility outlet, a DC charging pole, an AC charging pole, a mobile power cart, and an energy storage cabinet (e.g., a large energy storage cabinet).

The input interface 44 may also include a communication control interface. The input interface 44 can carry out communication control and negotiation of a charging protocol with an external power supply through the communication control interface. For example, the communication control interface may support a variety of communication protocols such that the input interface 44 may draw power from different types of power sources or such that the input interface 44 is compatible with different types of power input modes. As one example, the input interface 44 may interface the dc charging stake or the ac charging stake, enable the stake to wake up, analyze the communication protocol, or the like, to smoothly direct the electrical energy of the charging stake to the electrical energy storage portion 41.

With continued reference to fig. 7, in some embodiments, the charging system 4 may also include a second power conversion section 45. The second power conversion section 45 may be electrically connected to the input interface 44. For example, the second power conversion portion 45 may be electrically connected to the input interface 44 through the wire harness 1 in fig. 7.

The second power conversion part 45 may convert the direct current power into a second charging power suitable for charging the charge storage part 41 to charge the charge storage part 41. For example, the second power conversion section 45 may include a DC/DC converter. The DC/DC converter can convert the DC power input from the input interface 44 into DC power having a suitable voltage, and the DC power obtained by the conversion can be used as the second charging power to charge the power storage unit 41. As another example, the second power converting part 45 may include an AC/DC converter. The AC/DC converter converts AC power input from the input interface 44 into DC power, and the DC power thus converted can be used as the second charging power to charge the power storage unit 41. Of course, the second power conversion section 45 may support conversion of both the direct current power and the alternating current power into the second charging power. For example, the second power converter 45 may include both a DC/DC converter and an AC/DC converter.

Currently, charging devices on the market generally require power to be taken from a mains socket. However, for safety, the power usage of the utility AC outlet is typically limited, thereby causing the charging device to fail to charge the battery pack with high power. The charging system 4 provided in the embodiment of the application uses the electricity storage portion 41 to supply electricity, and is not limited by a mains socket. Thus, in some embodiments, the charging power of the charging system 4 may be specifically tailored so that the average charging power (or maximum charging power) of the charging system 4 is greater than the utility outlet's limit on the power usage. In other words, the charging system 4 provided by the embodiment of the application can break the limitation of the commercial power on the charging power so as to support the high-rate charging of the battery pack. For example, in north america, the charging power of charging system 4 may be greater than 1.8KW, and in europe, the charging power of charging system 4 may be greater than 3.6KW.

In addition, the average charging power of the charging system 4 to the battery pack provided by the embodiment of the application is not smaller than the average discharging power of the battery pack to the electric tool. Specifically, the average charging power of the battery pack by the charging system 4 refers to the average charging power of the single battery pack by the single charging bin. The average charge power is the charge power input during the effective charge time when the electric quantity of the battery pack is charged from the empty state (for example, below 5% soc) to the full state (for example, above 95% soc), and the average discharge power is the discharge power output during the effective discharge time when the electric quantity of the battery pack is discharged from the full state (for example, above 95% soc) to the empty state (for example, below 5% soc). The effective charge time refers to the sum of the times when the battery pack is in a charged state during the process from an empty state to a full state, and the effective discharge time refers to the sum of the times when the battery pack is in a discharged state during the process from the full state to the empty state. For example, if the charging process of the battery pack from the empty state to the full state is for 1 hour, wherein the battery pack is charged for 20 minutes, the charge is charged to Q1, rest for 20 minutes, and the charge is recharged for 20 minutes, the charge is charged from Q1 to the full state Q2, the effective charging time of the battery pack is 40 minutes throughout the charging process. The average charging power of the battery pack from the empty state to the full state should be the average charging power of the battery pack over different charging periods. In another example, when the charging process of the battery pack is a continuous process, that is, when the battery pack is continuously charged to the full state without stopping after the empty state of the battery pack starts charging, the average charging power of the battery pack is the ratio of the charging power of the battery pack to the continuous charging time. Similarly, when the battery pack is discharged from the full state to the empty state for one hour, wherein the battery pack is discharged for 20 minutes, the electric quantity is discharged from Q2 to Q3, the rest is performed for 20 minutes, and the electric quantity is discharged from Q3 to the empty state, the effective discharge time of the battery pack is 40 minutes in the whole charging process. The average discharge power of the battery pack from the full-power state to the empty-power state is the average discharge power of the battery pack in different discharge periods. In another example, when the discharging process of the battery pack is a continuous process, that is, the battery pack is continuously discharged to the empty state after the battery pack starts to discharge from the full state without stopping, the average discharging power of the battery pack is the ratio of the discharging electric quantity of the battery pack to the continuous discharging time.

In another embodiment, the ratio of the average charge power of a single battery pack to the discharge rate of a single battery pack to a single power tool may be between 0.5 and 2. I.e. the ratio of the average charge power to the average discharge power may be 0.5, 0.8, 1 or 2. In this embodiment, when the ratio of the average charging power to the average discharging power is 0.5, three battery packs may be configured for one electric tool to achieve uninterrupted power supply, where one battery pack is used as a working battery pack, and the other two battery packs are used as backup battery packs. When the ratio of the average charge power to the average discharge power is 0.8, although the average charge power is slightly smaller than the average discharge power, since the user may not continuously use the electric power tool but intermittently use the electric power tool during the use of the electric power tool, the spare battery pack can be fully charged before the working battery pack is discharged even though the average charge power is slightly smaller than the average discharge power.

Preferably, the ratio of the average charging power to the average discharging power may be 1 to 2. Preferably, the ratio of the average charging power to the average discharging power may be 1 to 1.2. When the ratio of the average charge power to the average discharge power is greater than 1, the spare battery pack can be fully charged before the working battery pack is discharged even if the discharging process of the battery pack is continuous discharging.

As one example, the average charging power of the charging system 4 to the single battery pack may be set to not less than 2.4KW, and preferably, the average charging power of the charging system to the single battery pack may be set to not less than 3KW. For example, the average charging power of the charging system to the individual battery packs may be set to 3KW, 4KW, 5KW, or 6KW.

Further, since the average charging power of the battery pack is not less than the average discharging power, the effective charging time for charging the battery pack from the empty state to the full state is not longer than the effective discharging time required for discharging the battery pack from the full state to the empty state.

Further, the charging system 4 may support simultaneous charging of multiple battery packs. For example, the charging system 4 may support simultaneous charging of two battery packs, and the total charging power of the charging system 4 per unit time may reach more than 6KW.

The charge-discharge magnification of the battery pack may be set to not less than 3C, in which case, if the electric quantity of the battery pack is set to 0.6KWH and the battery pack is charged with 3KW of charging power, the battery pack may be rapidly charged within 20 minutes. Further, if the discharging speed of the electric tool is also set to 3KW, the battery pack can end the discharging for 20 minutes at the maximum. Therefore, by adopting the design, the charging speed and the discharging speed of the battery packs are equal, so that uninterrupted operation of the electric tool system can be realized by using two groups of battery packs.

Further, when the charge rate of the battery pack is set to not less than 4C, if the electric quantity of the battery pack is set to 0.6KWH and the battery pack is charged with a charge power of 3KW, the battery pack can be rapidly charged within 15 minutes. When the charge rate of the battery pack is set to not less than 5C, if the electric quantity of the battery pack is set to 0.6KWH and the battery pack is charged with a charge power of 3KW, the battery pack can be rapidly charged within 12 minutes.

The charging system 4 according to the embodiment of the present application may be designed as a portable charging system (or a mobile charging system). The user can carry the charging system 4 with him/her to charge the battery pack at any time and any place.

Referring to fig. 7 and 12, in some embodiments, the input interface 44 and the second power conversion portion 45 of fig. 7 may be integrated together to form the input interface and power conversion portion 44 as shown in fig. 12. Alternatively, in some embodiments, the output interface 43 and the first power conversion section 42 in fig. 7 may be integrated together to form the output interface and the power conversion module 43 as shown in fig. 12. Of course, in some embodiments, the input interface and power conversion portion 44, the power storage portion 41, the output interface and the power conversion module 43 in fig. 12 may be integrated.

The specific value of the amount of electricity that the electricity storage portion 41 can accommodate needs to be determined according to the application scenario. Taking the garden trimming scenario shown in fig. 1 and 2 as an example, in general, a gardener or garden company needs to trim 10-20 gardens on the outside day. Therefore, the amount of electricity required for trimming 10-20 gardens a day may be estimated first, and then the amount of electricity that the electricity storage portion 41 can store may be set to be greater than or equal to the estimated amount of electricity. As described above, the average time consumption of each garden is 20-40 minutes, and can be specifically changed according to the garden area and working condition, for example, in a light working condition, the garden area is smaller, a garden team can complete the pruning operation of one garden within 20 minutes, the rest and transition time is removed, and 20 gardens can be pruned each day; under heavy working conditions, the garden team can finish the pruning operation of one garden within 40 minutes, the rest halfway and transition time are removed, and 10 gardens can be pruned each day. Therefore, the electric quantity storage part needs to meet the working time of about 6 hours per day of the electric tools, and the electric quantity carried by the battery pack is removed because the average output power of a plurality of electric tools in the garden operation is about 1800W, and the electric quantity of the electric quantity storage part needs to be not less than 10Kwh.

In some embodiments, the amount of electricity that the electricity storage portion 41 can hold may also be smaller than the electricity consumption requirement of the electric tool system during one day of the external work, for example, the amount of electricity of the electricity storage portion 41 may be set to be capable of meeting the electricity consumption requirement during half a day of the external work, so that the user may utilize the lunch time to supplement the electricity to the electricity storage portion 41, and therefore, the amount of electricity of the electricity storage portion needs to be not smaller than 5Kwh. In other embodiments, the garden working condition is simple, and only 10-12 groups of gardens need to be trimmed every day, so that the electric quantity storage part 5Kwh can meet the working requirement of one day.

In some embodiments, the power that the power storage portion 41 can hold may be larger than the power consumption requirement of one day when working outside, so that the power storage portion 41 may be supplemented once every several days without supplementing the power storage portion 41 every day, for example, the power of the power storage portion may be 20kwh,30kwh, etc.

In some embodiments, considering that the electricity storage portion is typically replenished through a utility power socket, the charging device cannot charge the electricity storage portion with high power because the power of the utility power AC socket is typically limited. For example, the power consumption of the utility power socket in north america is generally limited to 1.8KW or less, the power consumption of the utility power socket in europe is generally limited to 3.6KW or less, the power storage unit is replenished with night time after the day of the garden team is finished, and the power storage unit can be charged for 10-12 hours per day on average, so that the power storage unit can be replenished with 18-21.6Kwh of power at most per night in north america, and the power storage unit needs to be charged together with the battery pack, and therefore, the capacity of the power storage unit should be not more than 20Kwh in view of economic cost, and the capacity of the power storage unit should be not more than 42Kwh in europe.

The energy density of the charge storage portion is greater than that of the battery pack so as to store more charge at the same weight. Specifically, the electric quantity storage part can adopt a lithium iron phosphate battery, and because the outdoor working environment is bad, the lithium iron phosphate battery is safer, is not easy to explode and fire, and has lower cost, the energy density of the 21700 type battery pack of the lithium iron phosphate battery system is more than or equal to 150Wh/Kg, the charging multiplying power and the discharging multiplying power of the battery are both 1C, the rated voltage is 48V, and the ratio of the energy density of the energy storage part to the energy density of the battery pack is not less than 1.5. In other embodiments, the energy storage portion may employ a 18650 type battery pack of a ternary lithium battery system having an energy density of 180Wh/Kg to 240Wh/Kg, and a ratio of the energy density of the energy storage portion to the energy density of the battery pack is not less than 1.8.

The following describes the configuration of the battery pack in each use scenario in detail in connection with a typical use scenario of a commercial garden tool.

For commercial garden-type tools, there are two typical usage scenarios. The first typical use scenario is for 1-2 workers to compose a team, working out for one day, to trim gardens for 10-20 households, or to service municipal or commercial gardens. After one provides garden trimming work, the whole team goes to another garden to continue work. Garden trimming work typically includes mowing, pruning, blowing grass, and the like. Correspondingly, as shown in fig. 13, the electric tools required for the electric tool system include a wheeled electric tool 200 and a handheld electric tool 300, wherein the wheeled electric tool 200 includes a push mower 201, and the handheld electric tool 300 includes a mower 301, a pruner 302, and a blower 303. Depending on the type of the power tool, the type of battery pack in the battery pack system 100 for supplying power thereto may be different, for example, the battery pack system 100 may be each composed of the first type battery pack 101, or the battery pack system 100 may be composed of the first type battery pack 101 and the second type battery pack 102, or the battery pack system 100 may be each composed of the second type battery pack 102. When the battery pack on the electric tool is exhausted, the energy storage charging system 400 or the electric vehicle can be used to charge the battery pack, so that the electric tool system can continuously supply energy.

For garden trimming work, mowing work is usually the longest, and for a 1000 square meter garden, the average time of mowing work is 20-30 minutes, and the total work time of other works is almost the same as that of mowing work. Thus, per garden, worker a will immediately begin mowing with the push mower. During mowing by worker a, worker B may perform other types of work in sequence, such as, worker B may mow, prune, and blow grass, and worker a and worker B may perform all work at about the same time.

For the first common use scenario of the commercial garden-type tools, the battery pack may be configured for the power tools required in the use scenario in a variety of ways, so that the energy of the battery pack can support uninterrupted operation of a plurality of power tools. Several typical battery pack configurations are listed below:

in a first manner, the battery pack system may be configured from a first type of battery pack. In this example, the capacity of the first type battery pack may be 11Ah, and the continuous charging rate of the first type battery pack may reach 6C, and the continuous discharging rate may also reach 4C, so that the charging speed of the first type battery pack is greater than or equal to the discharging speed. Because the working time of the hand-push mower is longest, in order not to interrupt mowing work, a first type battery pack can be independently configured for the hand-push mower to supply power for the hand-push mower, and the first type battery pack is arranged on the hand-push mower. Because the work of the grass trimmer, the pruning machine and the blower is completed in sequence, a shared first type battery pack can be configured for the grass trimmer, the pruning machine and the blower, and the first type battery pack can be a backpack type battery pack and can support the grass trimmer, the pruning machine and the blower to complete the pruning, the grass trimming and the grass blowing of a garden together. Typically, worker A mows with a lawnmower while worker B mows with a lawnmower. After the grass mowing is finished, the grass mowing machine is disconnected with the battery pack, then the pruning machine is connected with the battery pack, and the pruning machine starts to work. After the pruning work is completed, the connection between the pruning machine and the battery pack is released, the blower is connected with the battery pack, and the blower starts to work. If the electric tool system is to work uninterruptedly, the two electric tools working simultaneously can be respectively provided with a standby battery pack, when the electric quantity of the working battery pack is exhausted, the standby battery pack is used for supplying power to the system, and meanwhile, the working battery pack is charged. Since the charging speed of the first type battery pack is greater than the discharging speed, one spare first type battery pack can be provided for each of the electric tools that operate simultaneously. In summary, for the first typical application scenario, four first type battery packs may be configured for the power tool system, where two of the first type battery packs are working battery packs and two of the first type battery packs are backup battery packs.

In a second manner, the battery pack system may be configured from a first type of battery pack and a second type of battery pack having a capacity less than the capacity of the first type of battery pack. In this example, the capacity of the first type of battery pack may be 11Ah. The capacity of the second type of battery pack was 4Ah. The second type of battery pack has a charge rate of 12C and a discharge rate of 10C. Because the charge-discharge multiplying power is great, after the one-time charge-discharge cycle, the surface temperature of the battery pack exceeds the charge temperature protection threshold value of the battery pack, and the battery pack can be reused after waiting for cooling, so when the second type battery pack is adopted for supplying power to the electric tool, the number of the standby battery packs is required to be larger than that of the working battery packs. In this example, a first type of battery pack may power the walk behind mower, the first type of battery pack being mounted on the walk behind mower. The second type battery pack can supply power for handheld electric tools such as a grass trimmer, a pruning machine, a blower and the like, and is detachably arranged on the grass trimmer, the pruning machine and the blower. In order to improve the working efficiency, the electric tool system can realize uninterrupted work, and two first-class battery packs, one serving as a working battery pack and one serving as a standby battery pack, can be configured for the hand-push mower. When the electric quantity of the working battery pack is exhausted, the standby battery pack is arranged on the hand-push mower and is charged, and the first type battery pack is charged at a speed not less than the discharging speed, so that the working battery pack is fully charged before the standby battery pack is discharged. Since the second battery pack has a higher temperature rise after one charge-discharge cycle, the second battery pack needs to be used continuously after waiting for the temperature rise to decrease, and therefore, for an electric tool, N standby second battery packs need to be configured so that n×t is greater than T charge, where T is the discharge duration of a single second battery pack and T is the sum of the wait duration and the charge duration of a single second battery pack after one charge-discharge is completed. When the charging multiplying power of the second battery pack is 12C and the discharging multiplying power is 10C, at least two standby second battery packs are required to be configured to support the electric tool to discharge, and after the two battery packs are discharged, the surface temperature of the first discharged battery pack is reduced to normal temperature, so that the electric tool can work uninterruptedly. For example, for a power tool with a power of 2KW, three second type battery packs are required, one of which is used as a working battery pack and two of which are used as backup battery packs, and when the power of the working battery pack is exhausted, the working battery pack is waited for cooling, and the first backup battery pack is mounted on the power tool. And after the electric quantity of the first standby battery pack is exhausted, charging the first standby battery pack, and reducing the temperature of the working battery pack. The second standby battery pack is arranged on the electric tool to supply power for the tool, when the second standby battery pack supplies power, the working battery pack is charged, when the second standby battery pack is fully charged, the working battery pack can be put into use again, and the three battery packs can be charged and discharged in turn to support the electric tool to work uninterruptedly. Furthermore, in order to meet the use habit of the traditional fuel oil tool, a second type battery pack can be pre-installed for each handheld electric tool in the electric tool system, so that the battery packs are prevented from being replaced when the electric tools are replaced each time, and the switching frequency of the battery packs is reduced. In this example, for the grass trimmer, the pruning machine and the blower, a second type of battery pack may be installed in advance, and then two standby battery packs may be configured, so that uninterrupted operation of the grass trimmer, the pruning machine and the blower may be achieved. As another example, when the second type battery pack is configured for the hand-held electric tools, if the working time of each hand-held electric tool in a garden is not long, one second type battery pack may be configured for each hand-held electric tool.

In a third way, the battery pack systems may each be configured from a second type of battery pack. That is, the hand mower, the grass trimmer, the pruner and the blower may be provided with a plurality of second-type battery packs, which in turn supply power to the electric tool system so that the electric tool system works uninterruptedly. Similarly, in order to conform to the use habit of the traditional fuel oil tool, a second type battery pack can be pre-installed for each handheld electric tool in the electric tool system, so that the battery packs are prevented from being replaced every time the electric tool is replaced, and the switching frequency of the battery packs is reduced. In this example, a second type of battery pack may be previously installed for the mower, the pruner, and the blower, respectively. When the garden team works, as the working team comprises 2 persons and the 2 persons work simultaneously, two electric tools work at the same time, and in order to realize that the two electric tools can work uninterruptedly, two standby second-type battery packs can be configured for the two electric tools which work simultaneously besides the working battery packs arranged on the electric tools.

A second typical application scenario for commercial garden power tools is to make up a work team of 1-2 people working on the outside for a day to finish a garden for 10-20 households. The second exemplary use scenario differs from the first exemplary use scenario in that the type of power tool is not exactly the same. Specifically, as shown in fig. 14 and 15, in a second typical use scenario, mowing work is done by the intelligent mower 202 or the riding mower 203, the walk-behind mower 201 is repaired, and other work is done by the mower 301, the pruner 302, and the blower 303, i.e., the power tool system includes the intelligent mower 202, the walk-behind mower 201, the mower 301, the pruner 302, and the blower 303, or the power tool system includes the riding mower 203, the walk-behind mower 201, the mower 301, the pruner 302, and the blower 303. The work team may include 1 person or 2 persons.

As shown in fig. 14, when the power tool system includes the intelligent mower 202, the work team may include 1 person, and when the intelligent mower 202 mows, the worker a repairs by using the hand mower 201, and after the repair is completed, the worker a performs other works by using the mower 301, the pruner 302, and the blower 303. Or the work team may also include 2 people, and when the intelligent mower 202 mows, the worker A repairs by using the hand mower 201, and meanwhile, the worker B performs other works by using the mower 301, the pruner 302 and the blower 303, and the worker A can assist the worker B in working after finishing the repair.

As shown in fig. 15, when the power tool system includes the riding mower 203, the work team may include 1 person, in which case, the lawn of the garden is already repaired by other gardeners using the riding mower 203, and the current gardeners only need to repair and other non-mowing works, that is, the worker a performs repair using the hand mower 201, and after the repair is completed, the mower 301, the pruner 302 and the blower 303 are used for other works. Alternatively, as shown in fig. 15, when the power tool system includes the riding mower 203, the work team may also include 2 persons, in which case, the lawn of the garden also needs to be repaired by the current garden company, that is, the worker a mows with the riding mower 203, the worker B repairs with the hand mower 201, after the repair is finished, other works are performed with the mower 301, the pruner 302 and the blower 303, and the worker a can assist the worker B in performing other works after the mowing work is finished.

For a second typical application scenario, the battery pack may be configured in the following manner:

when the power tool system includes a smart mower and the work team includes 1 person, the battery pack systems may each be configured from a first type of battery pack. Because two electric tools work simultaneously at the same time, namely the intelligent mower and the worker A work, a first type battery pack can be configured for the intelligent mower, the first type battery pack is installed on the intelligent mower, and a second type battery pack is configured for the worker A work. Typically, a worker a installs a first type battery pack on a hand mower, releases the connection between the first type battery pack and the hand mower after the repair by the hand mower is completed, installs the first type battery pack on a back frame, carries the first type battery pack, connects the mower with the first type battery pack, and starts the mowing work. After the grass mowing is finished, the grass mowing machine is disconnected with the first type battery pack, then the pruning machine is connected with the first type battery pack, and the pruning machine starts to work. After the pruning work is completed, the connection between the pruning machine and the first type battery pack is released, the blower is connected with the first type battery pack, and the blower starts to work. In order to achieve uninterrupted power supply for the power tool system, a spare battery pack is also required to be configured for the power tool system. Because the charging speed of the first battery pack is greater than the discharging speed, a standby first battery pack can be respectively configured for the electric tools working at the same time, when the electric quantity of the working battery pack is exhausted, the standby battery pack is used for supplying power to the electric tool system, and meanwhile, the working battery pack is charged, and before or when the electric quantity of the standby battery pack is exhausted, the working battery pack is full and can be put into use. Thus, by configuring the power tool system in this example with four first-type battery packs, uninterrupted operation of the power tool system can be achieved.

When the power tool system includes a smart mower and the work team includes 1 person, the battery pack system may also be configured from a first type battery pack and a second type battery pack. The first type of battery pack is used for supplying power to the intelligent mower and the hand-push mower, and the second type of battery pack is used for supplying power to the handheld electric tool, such as a mower, a pruning machine and a blower. Similarly, to conform to the usage habits of conventional fuel tools, a second type of battery pack may be pre-installed for the mower, pruner, and blower, respectively. When a garden works, the intelligent mower works continuously, and the hand-push mower can work intermittently as a supplement, so that the intelligent mower can be provided with two first-type battery packs, one serving as a working battery pack and the other serving as a standby battery pack, so that the intelligent mower works continuously. A first type of battery pack is configured for a walk behind mower, and when the battery pack on the walk behind mower is depleted, the battery pack is charged and other work is performed with other hand-held tools while charging. Meanwhile, since each handheld tool is provided with one second battery pack in advance, and a worker only uses one handheld tool at the same time during working, two shared standby second battery packs can be configured for a plurality of handheld tools. In summary, the system may be configured with three first-type battery packs and five second-type battery packs. Typically, when the intelligent mower is in operation, worker A performs the repair using the hand mower. When the electric quantity of the battery pack on the hand-push mower is exhausted, the battery pack is charged, and when the battery pack is charged, a worker A installs the second battery pack on the pruning machine and performs pruning work. After pruning work is completed, the second type battery pack is installed on a grass mowing machine to perform grass mowing work. And when the electric quantity of the second battery pack is exhausted, charging the second battery pack, and installing the standby second battery pack on the grass cutting machine to continue working. When the standby second type battery pack is exhausted, the worker A can install the charged first type battery pack on the mower and continue mowing by using the hand-pushed mower. As another example, when the second type battery pack is configured for the hand-held electric tools, if the working time of each hand-held electric tool in a garden is not long, one second type battery pack may be configured for each hand-held electric tool.

When the power tool system includes a smart mower and the work team includes 2 people, the battery pack systems may each be configured from a first type of battery pack. At the same time, three electric tools work simultaneously, the intelligent mower automatically performs mowing work, the worker A performs repairing by using the hand-push mower, and the worker B performs other work by using the hand-held tool, such as mowing work by using a mower, pruning work by using a pruner, or blowing work by using a blower. The work of the intelligent mower, worker a and worker B, respectively, may be provided with a first type of battery pack, wherein worker a and worker B may employ a backpack type of battery pack. In order to realize uninterrupted power supply for the electric tool system, three standby battery packs are also needed to be provided for the system, and when the electric quantity of the working battery pack is exhausted, the standby battery packs are used for supplying power for the system, and meanwhile, the working battery packs are charged. Accordingly, six first-type battery packs may be provided for the power tool system.

When the power tool system includes a smart mower and the work team includes 2 people, the battery pack system may be configured from a first type battery pack and a second type battery pack. The first type of battery pack is used for supplying power to the intelligent mower and the hand-push mower, and the second type of battery pack is used for supplying power to the handheld electric tool, such as a mower, a pruning machine and a blower. Similarly, to conform to the usage habits of conventional fuel tools, a second type of battery pack may be pre-installed for the mower, pruner, and blower, respectively. When the intelligent mower automatically mows, the worker A repairs by using the hand-push mower, and the worker B performs other works by using the hand-held tool. A first battery pack group can be configured for the intelligent mower to operate uninterruptedly, a first battery pack group can be configured for the hand mower to operate uninterruptedly, and two standby second battery packs are configured for the pruning machine, the grass trimmer and the blower together to operate uninterruptedly. In this example, the battery pack system may include four first-type battery packs and five second-type battery packs, wherein two first-type battery packs and one second-type battery pack are grouped as a working battery pack.

As shown in fig. 5, when the power tool system includes a riding mower and the work team includes 1 person, the battery pack systems may each be configured from a second type of battery pack. In the working system, lawn trimming work is completed by other garden companies through riding type mowers, and the current garden companies only need to carry out lawn repairing and trimming and other non-mowing consolidated works. Similarly, to conform to the usage habits of conventional fuel tools, a second type of battery pack may be pre-installed for the mower, pruner, and blower, respectively. Because the work team is 1 person, only one electric tool is working at the same time. Typically, the worker a installs a second type battery pack on the hand mower, performs repair work by using the hand mower, charges the battery pack after the battery pack is exhausted, and installs a spare second type battery pack on the hand mower, preferably, the number of spare second type battery packs may be two. The power tool system is powered by a plurality of second type battery packs in alternating cycles to complete a garden trimming operation.

When the power tool system includes a riding mower and the work team includes 1 person, the battery pack system may be configured from a first type battery pack and a second type battery pack. Wherein the first type of battery pack is used to power riding mowers and hand propelled mowers and the second type of battery pack is used to power hand-held power tools such as lawnmowers, pruners and blowers. Similarly, a second type of battery pack may be previously installed for the mower, the pruner, and the blower, respectively. Since the working team is 1 person, only one kind of electric tool is working at the same time, the number of the first kind of battery packs may be one and the number of the second kind of battery packs may be five in this example. Typically, worker a would first install a first type of battery pack on the mower and use the mower for repair work. After the battery pack on the mower is exhausted, the battery pack is charged, then a worker A starts pruning by using the pruner, and after the battery pack of the second type on the pruner is exhausted, the pruner can be powered by the two standby battery packs in turn to finish pruning. Before or after pruning is finished, the first type battery pack is full, and the worker A can install the first type battery pack on the mower for repair work. In this manner, the power tool system can be operated without interruption by alternating use of a mower and other hand-held tool.

When the power tool system includes a riding mower and the work team is 2 people, the battery pack system may be configured from a first type battery pack and a second type battery pack. Wherein the first type of battery pack is used to power riding mowers and hand propelled mowers and the second type of battery pack is used to power hand-held power tools such as lawnmowers, pruners and blowers. Similarly, a second type of battery pack may be previously installed for the mower, the pruner, and the blower, respectively. The worker A mows by using the riding mower, the worker B repairs by using the hand mower, and the worker B can be assisted to work after the work of the worker A is finished. In the work system, a first battery pack can be configured for riding mowers and hand propelled mowers, and a second battery pack can be configured for standby mowers, pruners, and blowers. When the worker A mows by using the riding mower, the worker B can repair by using the hand-push mower, and after repair is finished, the worker B can perform other works by using the mower, the pruner and the blower. To achieve uninterrupted operation, the system requires 3 first type battery packs and two second type battery packs. Two of the first type of battery packs are used to power riding lawn mowers, one as a working battery pack and one as a backup battery pack. When worker a performs a mowing operation using the riding mower, worker B performs a repair using the push mower, and thus the third first type battery pack is used to power the push mower. And after the electric quantity of the battery pack on the hand-push mower is exhausted, the battery pack is charged. When the electric energy storage device is charged, the worker B can carry out pruning work by using the pruning machine, and after the electric quantity of the second-type battery pack on the pruning machine is exhausted, the two standby second-type battery packs are used for supplying power for the pruning machine in turn so as to complete the pruning work. Similarly, after the pruning work is completed, a grass cutting work is performed. When the standby second type battery pack is exhausted, the worker B can install the charged first type battery pack on the mower and continue mowing by using the hand mower. In this manner, the power tool system can be operated without interruption by alternating use of a mower and other hand-held tool.

As can be seen from the above typical application scenario, in order to realize uninterrupted operation of the electric tool system, in the garden operation, a plurality of battery packs are required to be carried for operation, the battery pack group of the battery pack system includes a working battery pack and a standby battery pack, the working battery pack and the standby battery pack work alternately, each battery pack needs to be charged and discharged repeatedly for a plurality of times, and the electric quantity of the electric quantity storage part needs to be large enough to meet the electric quantity circulation times of the battery pack system.

In a specific embodiment, the 2-person working group carries at most 6 battery packs, one of which is used for supplying power to the intelligent mower, one of which is used for supplying power to the manual mower used by the worker A, one of which is used for supplying power to the pruning machine, the grass trimmer and the blower used by the worker B, the intelligent mower, the worker A and the worker B work simultaneously, and the rest 3 battery packs are standby batteries for charge alternation; therefore, in a 1-2 person work team, the work requirement can be met by carrying 6 battery packs, and redundant battery packs are not necessary. In this embodiment, the battery pack is a first type battery pack, and as described above, the capacity of the first type battery pack is 1Kwh at maximum, and the capacity of the power storage unit is 5Kwh at minimum, so the capacity ratio of the power storage unit to the battery pack is not less than 0.83 in consideration of the limit.

Of course, in other cases, the capacity ratio of the electricity storage portion to the battery pack may be other values, specifically:

in one case, the battery pack group comprises 4 battery packs, the battery packs are second-type battery packs, the capacity of the second-type battery packs is 0.2Kwh, the capacity of the electric quantity storage part is 5Kwh, and the capacity ratio of the electric quantity storage part to the battery pack group is 6.25;

in one case, the battery pack includes 4 battery packs including 2 first-type battery packs and 2 second-type battery packs, the capacity of the first-type battery packs is 0.6Kwh, the capacity of the second-type battery packs is 0.2Kwh, the capacity of the electric quantity storage part is 7.2Kwh, and the capacity ratio of the electric quantity storage part to the battery pack is 4.5;

in one case, the battery pack group comprises 4 battery packs, the battery packs are second-type battery packs, the capacity of the second-type battery packs is 0.2Kwh, the capacity of the electric quantity storage part is 20Kwh, and the capacity ratio of the electric quantity storage part to the battery pack group is 25;

in one case, the battery pack group comprises 4 battery packs, the battery packs are second-class battery packs, the capacity of the battery packs is 0.2Kwh, the capacity of the electric quantity storage part is 42Kwh, and the capacity ratio of the electric quantity storage part to the battery pack group is 52.5;

in one case, the battery pack comprises 9 battery packs, an intelligent mower, a hand mower, a blower, a pruner, a grass trimmer and other tools for preassembling the battery packs, wherein 4 standby battery packs are required to be carried, and specifically, the battery pack comprises 4 first-class battery packs and 5 second-class battery packs, the capacity of the first-class battery packs is 0.5Kwh, the capacity of the second-class battery packs is 0.2Kwh, the capacity of an electric quantity storage part is 10Kwh, and the capacity ratio of the electric quantity storage part to the battery pack is 3.3;

In a specific embodiment, the battery pack group comprises 6 first-type battery packs, the capacity of the first-type battery packs is 1Kwh, the capacity of the electric quantity storage part is 10Kwh, and the capacity ratio of the electric quantity storage part to the battery pack group is 1.67;

the above is not an example, and the battery pack and the power storage unit can be properly configured according to different working conditions and requirements.

It should be noted that, although the above embodiment is described taking a battery pack with a nominal voltage of 60V as an example, when the nominal voltage of the battery pack is other voltage values, the relationship between the charging rate and the discharging rate of the battery pack can still enable the battery pack to satisfy the above uninterrupted recycling state, so as to reduce the use cost of the battery pack. For example, when the voltage of the battery pack is 20V, the output current of the battery pack is not less than 60A, so that the battery pack can satisfy the high power requirement of the electric tool. If the capacity of the battery pack is 11Ah and the discharge current is 60A, the discharge rate of the battery pack is about 6C. By configuring the output current of the electric quantity storage part, the charging multiplying power of the battery pack is not less than 6C, and when the charging multiplying power is not less than 6C, the temperature in the charging process of the battery pack is less than the temperature protection threshold of the battery pack, so that the battery pack can be immediately discharged after the charging is finished, and the battery pack can be immediately charged after the discharging is finished, and uninterrupted use of the battery pack is realized.

Generally, in order to enable gardeners to carry electric tools and reduce the number of battery packs carried during outgoing work and guarantee the endurance time of the electric tools, the industry is generally researched in order to improve the energy density of the battery packs, so that electric quantity is stored as much as possible under the condition that the weight of each battery pack is unchanged, and a small number of battery packs are carried during outgoing work of a work team, so that the electric tools can work uninterruptedly. Aiming at the improvement of energy density, all battery manufacturers start with the cell structure, and the cell size is increased by fine adjustment of the cell structure to achieve the effect of capacity expansion of electric quantity. However, as the size of the battery core increases, the quality of the battery core also increases, so that the adjustment of the battery core structure can only treat the symptoms but not the root cause, and the key is that the positive and negative electrode materials with high energy density can be found. Research on anode and cathode materials has reached the bottleneck stage at present, so the energy density of the battery cell has a limited range of improvement.

Aiming at the problem of continuous voyage of a garden electric tool system, the application provides another research direction, the charging rate of the battery pack is improved to improve the charging speed of the battery pack, so that the charging speed of the battery pack is close to the discharging speed, an energy storage type charging system is utilized to alternately charge a plurality of battery packs, the electric tool can work uninterruptedly by adopting a small amount of battery packs to supply power to the electric tool, for example, two first-class battery packs or three second-class battery packs can be used for supplying power uninterruptedly to the electric tool which is working, thereby enabling a working team to carry a small amount of battery packs to realize the uninterrupted work of the electric tool when working outdoors, improving the portability of the battery pack system and reducing the use cost of the battery pack system.

Yet another embodiment of the present application provides a work system including at least one garden-type power tool. Wherein the configuration of the power tool in the power tool system is as described above. The garden type electric tool comprises a main body, a motor output shaft and a working part. The motor is arranged in the main body and used for providing power. The motor output shaft is connected with the motor and used for rotating under the drive of the motor. The working part is coupled with the motor output shaft and is used for working under the drive of the motor output shaft. The power tool system further comprises a battery pack system, wherein the battery pack system comprises a plurality of battery packs, and the battery packs are detachably connected with the power tool and used for alternatively supplying power to the power tool system so that the power tool system can work uninterruptedly.

Further, the electric tool system comprises at least two of garden electric tools such as a blower, a grass trimmer, a grass mower, a pruning machine, a brush cutter and the like. Wherein, the output power of garden electric tool is more than or equal to 1200W. Preferably, the output power of the garden electric tool is 1600W or more. More preferably, the output power of the garden electric tool is 2000W or more.

In the present application, the number of battery packs in the battery pack system may be configured according to the number of electric tools that are simultaneously operated in the garden electric tool system, preferably, the number of battery packs may be configured to be not less than the number of battery packs required when the electric tool system is operated, and more preferably, the number of battery packs may be configured to be not less than twice the number of battery packs required when the electric tool system is operated. The number of battery packs required for operation of the power tool system is understood to be the maximum number of battery packs that need to be used at the same time when the power tool system is in operation.

Further, the power tool system includes a charging device for replenishing the battery pack system with electrical energy, and an electrical energy storage device. The electrical energy storage device is configured to removably provide electrical energy to the battery pack. The electrical energy storage device may be a mobile energy storage charging system, an electric vehicle, or the like. The gardens team can be full of the battery package that will carry in evening the preceding day of work of going out and utilize energy storage charging system to carry full battery package when going out the work the next day, in order to improve work efficiency.

Above-mentioned electric tool system through adopting aforesaid battery package to supply power for it, can realize incessantly working under the less circumstances of battery package quantity, has reduced battery package use cost, has improved electric tool's work efficiency to make gardens team conveniently carry battery package when going out the work.

Claims

1. A power supply system for providing power required for a garden work team, comprising:

a battery pack comprising a plurality of battery packs for alternately powering a power tool system carried by a garden work team, the power tool system comprising a plurality of garden-type power tools, a single battery pack weighing less than 10Kg;

the energy storage type charging system comprises an electric quantity storage part and an output interface; the electric quantity storage part charges the battery pack through the output interface, and the electric capacity of the electric quantity storage part is not less than 5Kwh;

the ratio of the capacitance of the electricity storage part to the total capacitance of the battery pack is not less than 0.83.

2. The power supply system according to claim 1, wherein the battery pack group includes a first type battery pack, and/or a second type battery pack, the first type battery pack having a capacity of 0.5KWh to 1KWh, and the second type battery pack having a capacity of 0.2KWh to 0.3KWh.

3. The power supply system of claim 2, wherein the battery pack comprises a first type of battery pack, the first type of battery pack being 1-6 in number.

4. The power supply system of claim 2, wherein the battery pack comprises a second type of battery pack, the number of second type of battery packs being 1-6.

5. The power supply system of claim 2, wherein the first type of battery pack is a hand-held battery pack and the second type of battery pack is a backpack type of battery pack.

6. The power supply system according to claim 1, wherein a capacitance of the electricity storage portion is not less than 10Kwh, and a ratio of the capacitance of the electricity storage portion to a total capacitance of the battery pack is not less than 1.67.

7. The power supply system according to claim 1, wherein a capacity of the electricity storage portion is not more than 42KWh, and a ratio of the capacity of the electricity storage portion to a total capacity of the battery pack is not more than 52.5.

8. The power supply system according to claim 7, wherein a capacity of the electricity storage portion is not more than 20KWh, and a ratio of the capacity of the electricity storage portion to a total capacity of the battery pack is not more than 25.

9. The power supply system according to claim 1, wherein an average charging power of the single output interface to the single battery pack is not less than an average discharging power of the single battery pack to the electric power tool, the average charging power being a charging power required for an effective charging time for charging an electric quantity of the battery pack from an empty state to a full state, the average discharging power being a discharging power required for an effective discharging time for discharging the electric quantity of the battery pack from the full state to the empty state.

10. The power supply system of claim 1, wherein an energy density of the charge storage portion is greater than an energy density of the battery pack.

11. The power supply system according to claim 10, wherein a ratio of an energy density of the electricity storage portion to an energy density of the battery pack is not less than 1.5.

12. The power supply system according to claim 11, wherein a ratio of an energy density of the electricity storage portion to an energy density of the battery pack is not less than 1.8.

13. The battery pack of claim 10, wherein the battery pack has an energy density of 100Wh/Kg or more.

14. The battery pack according to claim 10, wherein an energy density of the electricity storage portion is 150Wh/Kg or more.

15. The battery pack according to claim 10, wherein the battery cell of the electricity storage portion is a lithium iron phosphate battery or a ternary lithium battery.

16. The battery pack of claim 10, wherein the battery cells of the battery pack are soft pack cells.

17. The power supply system according to claim 1, wherein the rated power of the electric tool is 1KW or more and 3KW or less.

18. A work system, comprising:

the power supply system of any one of claims 1-17;

a power tool system; the power tool system includes one or more of the following tools: grass cutters, hand propelled mowers, hedge trimmers, chain saws, blowers, leaf shreds, snowplows, riding mowers, and intelligent mowers.