Power supply system and charging system

Abstract

The utility model provides a power supply system and a charging system. The power supply system comprises a battery pack system which comprises a plurality of groups of battery packs for alternately supplying power to an electric tool system, and the electric tool system comprises one or more electric tools; the charging system comprises an electric quantity storage part which comprises one or more battery cells and is used for storing electric quantity; the input interface is connected with the one or more battery cells and receives input power so as to charge the battery cells, and the input power is direct-current power or alternating-current power; the first power conversion part is electrically connected with the electric quantity storage part and is used for performing power conversion on the electric quantity stored by the electric quantity storage part and outputting first charging power; the output interface is electrically connected with the first power conversion part and outputs electric energy with the first charging power to charge the battery pack; the electric quantity carried by the single battery pack is not larger than one eighth of the electric quantity capable of being contained by the electric quantity storage part. The power supply system provided by the utility model can realize uninterrupted work of the electric tool system.

Description

[0001] The present application is a divisional application of the Chinese Utility Model Patent Application No. CN202290000505.6, filed on June 16, 2022, entitled “Power Supply System, Working System and Charging System”, which is in the name of the applicant. TECHNICAL FIELD

[0002] The present application is in the field of electric power tools, and more specifically, in the field of a power supply system, a working system and a charging system. BACKGROUND

[0003] In some working scenarios, such as outdoor working scenarios, it is often necessary to use power tools to work for a long time without interruption. To achieve uninterrupted work of power tools, the choice of power source is the primary consideration.

[0004] Generally speaking, power tools using fuel as a power source (hereinafter referred to as fuel power tools, such as gasoline power tools) can meet the requirement of long-time uninterrupted work. However, the main problem of fuel power tools is that the exhaust gas released by them pollutes the environment, and the noise generated during the work of fuel power tools is relatively large, which will form noise pollution to the surrounding environment.

[0005] Electric power tools have the advantages of environmental protection and cleanliness, and compared with fuel power tools, electric power tools also generate relatively less noise. Therefore, electric power tools are increasingly favored by users of power tools. However, the main problem of electric power tools is that the battery pack can provide a relatively short endurance. This problem is particularly prominent in outdoor or scenarios without a city power socket.

[0006] Therefore, in the field of power tools, especially in the field of commercial power tools with high rated power requirements, although fuel power tools have obvious defects, they are still the first choice of users of power tools. SUMMARY

[0007] In view of this, the present application provides a power supply system, a working system and a charging system, which can solve the problem of power supply of electric power tool system to a certain extent and expand the application occasions of electric power tools.

[0008] In a first aspect, a power supply system is provided, comprising: a battery pack system comprising a plurality of battery packs for alternately supplying power to a power tool system, wherein the power tool system comprises a plurality of garden power tools; a portable energy storage charging system, comprising: an input interface configured to receive input power, the input power being direct current power or alternating current power; an energy storage unit comprising one or more battery packs, configured to charge the one or more battery packs using the direct current power or the alternating current power to store energy; a first power conversion unit electrically connected to the energy storage unit, configured to convert the energy stored in the energy storage unit into first charging power; an output interface electrically connected to the first power conversion unit, configured to output the first charging power; a plurality of charging bays electrically connected to the output interface, the charging bays being configured to place the battery packs and charge the battery packs using the first charging power output by the output interface; wherein the plurality of charging bays are configured to charge the battery packs in an idle state in the battery pack system during operation of the power tool system, so that at least one of the plurality of battery packs is charged to a full charge state before a battery pack in the plurality of battery packs is fully discharged by the power tool system.

[0009] In a second aspect, a power supply system is provided. The power supply system comprises: a battery pack system comprising a plurality of battery packs for alternately supplying power to a power tool system, wherein the power tool system comprises one or more power tools; and a charging system configured to charge the battery packs in an idle state in the battery pack system during operation of the power tool system, and the charging speed of the charging system for the battery pack system is not less than the discharging speed of the battery pack system for the power tool system.

[0010] In a third aspect, a power supply system is provided, comprising: a power tool system comprising a plurality of high-power power tools, the high-power power tools being power tools with a rated power greater than or equal to 1 KW and less than or equal to 3 KW; a battery pack system, the number of battery packs in the battery pack system being not less than twice the number of battery packs required for operation of the power tool system; and a portable charging system configured to charge the battery packs in an idle state in the battery pack system during operation of the power tool system, and the charging speed of the charging system for the battery packs is not less than the maximum discharging speed of the battery packs for the power tool system.

[0011] In a fourth aspect, a power supply system is provided, comprising: an electric tool system comprising a plurality of garden electric tools; a battery pack system comprising two groups of battery packs for alternately supplying power to the electric tool system; and a portable charging system capable of simultaneously charging one of the two groups of battery packs, and the charging speed of the charging system for the one group of battery packs is not less than the maximum discharging speed of the one group of battery packs to the electric tool system.

[0012] In a fifth aspect, a working system is provided, comprising: an electric tool system; and the power supply system according to any one of the first aspect to the third aspect.

[0013] In a sixth aspect, a charging system is provided, which is a portable charging system suitable for charging a battery pack of a high-power electric tool, the high-power electric tool being an electric tool with a rated power greater than or equal to 1 KW and less than or equal to 3 KW, the charging system comprising: an electric quantity storage unit for storing an electric quantity; a first power conversion unit electrically connected to the electric quantity storage unit, for converting the electric quantity stored in the electric quantity storage unit into a first charging power; and an output interface electrically connected to the first power conversion unit, for outputting the first charging power to charge the battery pack, and the configuration of the charging power of the output interface is such that the charging speed of the output interface to the battery pack is not less than the discharging speed of the battery pack to the high-power electric tool.

[0014] In a seventh aspect, a working method is provided, comprising: during the working of the electric tool system, alternately supplying power to the electric tool system by using a plurality of groups of battery packs in a battery pack system; and charging the battery packs in the battery pack system in an idle state by using a charging system, and the charging speed of the charging system to the battery pack system is not less than the discharging speed of the battery pack system to the electric tool system.

[0015] In an eighth aspect, a working method is provided, comprising: using a plurality of garden electric tools to trim a first garden, wherein during the trimming of the first garden, the plurality of garden electric tools are powered by a first group of battery packs; after the trimming of the first garden is completed, using a plurality of garden electric tools to trim a second garden, wherein during the trimming of the second garden, the plurality of garden electric tools are powered by a second group of battery packs; and charging the first group of battery packs by using a charging system, so that before the trimming of the second garden is completed, the first group of battery packs is charged to a full power state.

[0016] The present application provides a power supply system, a working system and a charging system.

[0017] The first aspect of the present application provides a power supply system, comprising: a battery pack system comprising a plurality of battery packs for alternately supplying power to an electric tool system, wherein the electric tool system comprises a plurality of electric garden tools; a portable energy storage charging system, comprising: an energy storage unit comprising one or more battery cells for storing energy; an input interface connected to the one or more battery cells, the input interface being configured to receive input power to charge the battery cells, the input power being direct current or alternating current; a first power conversion unit electrically connected to the energy storage unit, configured to convert the energy stored in the energy storage unit into a first charging power; an output interface electrically connected to the first power conversion unit, configured to output electrical energy at the first charging power; a plurality of charging bays electrically connected to the output interface, the charging bays being configured to place the battery packs and charge the battery packs using the electrical energy output by the output interface; wherein the average charging power of a single charging bay to a single battery pack is not less than the average discharging power of a single battery pack to the electric tool, the average charging power being the average of the charging power required for the energy of the battery pack to be charged from an empty state to a full state within the effective charging time, and the average discharging power being the average of the discharging power required for the energy of the battery pack to be discharged from a full state to an empty state within the effective discharging time.

[0018] In one embodiment, the maximum continuous charging power of the charging bay to the battery pack is not less than 2.4KW; preferably, the maximum continuous charging power of the charging bay to the battery pack is not less than 3KW.

[0019] In one embodiment, the average charging power required for the battery pack to be charged from an empty state to a full state within the continuous charging time is not less than the average discharging power required for the battery pack to be discharged from a full state to an empty state within the continuous discharging time.

[0020] In one embodiment, the continuous charging time required for the battery pack to be charged from an empty state to a full state is not greater than the continuous discharging time required for the battery pack to be discharged from a full state to an empty state.

[0021] In one embodiment, the internal resistance of the battery cells of the battery pack is configured such that the maximum continuous charging rate of the battery pack is not less than the maximum continuous discharging rate of the battery pack.

[0022] In one embodiment, the internal resistance of the battery cells of the battery pack is configured such that the maximum continuous charging rate and / or the maximum continuous discharging rate of the battery pack is not less than 3C, and the charging power of the charging bay to the battery pack is configured such that the charging time of the battery pack is not greater than 20 minutes.

[0023] Preferably, the internal resistance of the single battery cell of the battery pack is configured such that the maximum continuous charging rate and / or the maximum continuous discharging rate of the battery pack is not less than 4C, and the charging power of the charging cabin to the battery pack is configured such that the charging time of the battery pack is not more than 15 minutes.

[0024] Preferably, the internal resistance of the single battery cell of the battery pack is configured such that the maximum continuous charging rate and / or the maximum continuous discharging rate of the battery pack is not less than 5C, and the charging power of the charging cabin to the battery pack is configured such that the charging time of the battery pack is not more than 12 minutes.

[0025] In one embodiment, the amount of electricity carried by a single battery pack is not more than one eighth of the amount of electricity that the electricity storage unit can accommodate.

[0026] In one embodiment, the amount of electricity that the electricity storage unit can accommodate is not less than 5KWH.

[0027] In one embodiment, the capacity of the battery pack is not less than 500WH.

[0028] In one embodiment, the capacity of the single battery cell in the battery pack is not less than 10AH, and the number of single battery cells in the battery pack is not more than 15.

[0029] In one embodiment, the charging rate and discharging rate of the single battery cell in the electricity storage unit are respectively less than the charging rate and discharging rate of the single battery cell in the battery pack.

[0030] In one embodiment, the charging rate and discharging rate of the single battery cell in the electricity storage unit are both not more than 1.5C.

[0031] In one embodiment, the maximum number of charge-discharge cycles of the battery pack is not less than 3000 times; preferably, the maximum number of charge-discharge cycles of the battery pack is not less than 5000 times.

[0032] In one embodiment, the charging cabin and / or the battery pack further comprises a heating device and / or a heat dissipation device for temperature control of the battery pack, so that the battery pack can be continuously charged and discharged.

[0033] In one embodiment, a plurality of charging cabins are configured to charge the battery pack in the idle state in the battery pack system during the operation of the power tool system, so that at least one of the plurality of battery packs is charged to a full state before the battery pack in the plurality of battery packs is discharged by the power tool system.

[0034] In an embodiment, the first power conversion unit is further configured to convert the power stored in the power storage unit into alternating current power; and the output interface comprises a first alternating current output interface configured to output the alternating current power.

[0035] In an embodiment, the charging system further comprises a second power conversion unit electrically connected to the input interface and configured to convert the input power into a second charging power to charge the power storage unit.

[0036] In an embodiment, the input interface is configured to receive the input power from one or more of the following devices: a power socket, a direct current charging pile, an alternating current charging pile, a mobile power supply vehicle, and an energy storage cabinet.

[0037] In an embodiment, the power storage unit is configured to enable the direct current charging pile and / or the alternating current charging pile to charge the power storage unit from an empty state to a full state within one hour.

[0038] In an embodiment, a direct charging channel is provided between the input interface and the power storage unit, and the direct charging channel is configured to directly charge the power storage unit with direct current power when the input power is direct current power.

[0039] In an embodiment, the charging system further comprises a second alternating current output interface configured to output the alternating current power when the input power is alternating current power.

[0040] In an embodiment, the second alternating current output interface is configured to charge the battery pack through a charger and / or a power bank.

[0041] In an embodiment, the first power conversion unit is further configured to convert the power stored in the battery pack into a third charging power to charge the power storage unit.

[0042] In an embodiment, the maximum charging power of the charging system is greater than the limit of the power socket on the power consumption.

[0043] In an embodiment, the power supply system further comprises a back frame detachably connected to the battery pack.

[0044] In an embodiment, the electric tool has a rated power greater than or equal to 1 KW and less than or equal to 3 KW.

[0045] In an embodiment, the number of battery packs in the battery pack system is equal to twice the number of battery packs required for the electric tool system to work.

[0046] The second aspect of the present application provides a power supply system, comprising: a battery pack system comprising a plurality of battery packs for alternately supplying power to an electric tool system, wherein the electric tool system comprises a plurality of garden electric tools; a portable energy storage charging system, comprising: an energy storage unit comprising one or more battery cells for storing energy; an input interface connected to the one or more battery cells, the input interface being configured to receive input power to charge the battery cells, the input power being direct current power or alternating current power; a first power conversion unit electrically connected to the energy storage unit, configured to convert the energy stored in the energy storage unit into first charging power; an output interface electrically connected to the first power conversion unit, configured to output electrical energy in the form of the first charging power; a plurality of charging compartments electrically connected to the output interface, the charging compartments being configured to place the battery packs and charge the battery packs using the electrical energy output by the output interface; wherein the ratio of the average charging power of a single charging compartment to a single battery pack to the average discharging power of a single battery pack to the electric tool is between 0.5 and 2, the average charging power being the average of the charging power required for the battery pack to charge from an empty state to a full state within the effective charging time, and the average discharging power being the average of the discharging power required for the battery pack to discharge from a full state to an empty state within the effective discharging time.

[0047] The third aspect of the present application provides a charging system, comprising: an energy storage unit comprising one or more battery cells for storing energy; an input interface connected to the one or more battery cells, the input interface being configured to receive input power to charge the battery cells, the input power being direct current power or alternating current power; a first power conversion unit electrically connected to the energy storage unit, configured to convert the energy stored in the energy storage unit into first charging power; an output interface electrically connected to the first power conversion unit, configured to output electrical energy in the form of the first charging power; at least one charging compartment electrically connected to the output interface, the charging compartment being configured to place the battery pack and charge the battery pack using the electrical energy output by the output interface; wherein the average charging power of the charging compartment to the battery pack is not less than 2.4KW.

[0048] In one embodiment, the average charging power of the charging compartment to a single battery pack is not less than 3KW.

[0049] The fourth aspect of the present application provides a working system, comprising: an electric tool system and the aforementioned power supply system.

[0050] A fifth aspect of this application provides a method of operation comprising: using multiple gardening power tools to trim a first garden, wherein during the trimming of the first garden, the multiple gardening power tools are powered by a first battery pack; after trimming the first garden, using the multiple gardening power tools to trim a second garden, wherein during the trimming of the second garden, the multiple gardening power tools are powered by a second battery pack; and using a charging system to charge the first battery pack such that the first battery pack is fully charged before the second garden is trimmed, wherein the maximum continuous charging power of the charging system to the battery pack is not less than the maximum continuous discharge power of the battery pack to the power tools.

[0051] In one embodiment, the charging system is an energy storage charging system, and the stored electricity in the charging system is sufficient to support the multiple garden power tools in completing the maintenance of 10 to 20 gardens. Attached Figure Description

[0052] Figure 1 A schematic diagram of the working system provided in the embodiments of this application.

[0053] Figure 2 for Figure 1 Example diagram of the working system.

[0054] Figure 3 yes Figure 2 Example diagram of application scenarios for the working system.

[0055] Figure 4 yes Figure 2 An example diagram illustrating the working method of the system.

[0056] Figure 5 This is a schematic diagram of a possible installation method for the battery pack provided in an embodiment of this application.

[0057] Figure 6 This is a schematic diagram of another possible installation method of the battery pack provided in the embodiments of this application.

[0058] Figure 7 This is a schematic diagram of the structure of a charging system provided in an embodiment of this application.

[0059] Figure 8 This is a schematic diagram of the structure of a charging system provided in another embodiment of this application.

[0060] Figure 9 This is a schematic diagram of the structure of a charging system provided in another embodiment of this application.

[0061] Figure 10 This is a schematic diagram of the structure of a charging system provided in another embodiment of this application.

[0062] Figure 11 is a structural schematic diagram of a charging system provided by another embodiment of the present application.

[0063] Figure 12 is a structural schematic diagram of a charging system provided by another embodiment of the present application.

[0064] Figure 13 is Figure 1 is another example diagram of a working system in DETAILED DESCRIPTION

[0065] According to different power sources, power tools can be divided into electric power tools and fuel power tools. The fuel power tools have the advantages of being able to work for a long time at a large power without interruption, and the disadvantages of polluting the environment and making a large noise when working, which will form noise pollution to the surrounding environment. Therefore, people have been looking for alternatives to fuel power tools.

[0066] Electricity is an environmentally friendly and clean energy. Therefore, electric power tools are increasingly favored by people. However, the main problem of the current electric power tools, especially the high-power electric power tools with a rated power (or working power) of more than 1KW, is insufficient power supply, which cannot support the electric power tools to work continuously for a long time. Taking the electric power tools with a rated power of 1KW to 3KW as an example, the current battery pack can at most support the electric power tools of this type to work continuously for a few minutes. Once the battery pack is depleted, the charging of the battery pack often takes several hours. The above problem is usually referred to as the power anxiety problem of electric power tools.

[0067] The problem will be illustrated in more detail below taking garden tools as an example.

[0068] Garden tools usually refer to maintenance equipment for garden landscapes. The garden tools usually take lawns, hedges, flowers, trees or gardens as work objects. There are many types of garden tools, for example, one or more of the following tools can be included: a grass trimmer, a lawn mower, a hedge trimmer, a chain saw, a blower, a leaf shredder, a snow blower, etc.

[0069] Garden tools can be divided into household and commercial. Commercial garden tools are professional power tools designed for garden workers or garden companies. Compared with household garden tools, commercial garden tools have higher requirements for work efficiency, and therefore, the rated power (or maximum working power) of commercial garden tools is usually also relatively high.

[0070] For commercial garden tools, a common use scenario is that 2-3 workers form a team and work outside for a day to trim gardens for 10-20 families. For garden trimming work, mowing work usually takes the longest time, although the lawn size of different families is not consistent, the average time of mowing work is about 20-40 minutes. Therefore, every time the team arrives at a garden, worker A will immediately start mowing the lawn with a mower. During the mowing of worker A, worker B will complete other types of work in turn, such as worker B will first rake grass, then trim branches, and then blow grass. Worker A and worker B complete all work at about the same time. Therefore, the working time of a team at a garden is about 20-40 minutes (generally corresponding to the time of mowing work). Once the garden is trimmed, the team will go to another garden and repeat the above work process until all today's work tasks are completed.

[0071] Garden maintenance work itself has the attribute of green environmental protection, so for garden workers or garden companies, electric tools are the most ideal choice. However, as can be seen from the above description, commercial garden tools have very high requirements for the working efficiency of power tools, and the user usually hopes that the power source of the power tool can support uninterrupted work for a day. The above requirements are very difficult to meet for the current electric tools. Further, considering that garden work is usually carried out outdoors, and there is usually no power socket outdoors, leading to the fact that even if an electric tool is used, it cannot be charged in time. For the above reasons, the current commercial garden tools are mainly fuel-powered tools. Although a small number of commercial garden tools also use electric tools, the electric tools are generally only used as auxiliary tools.

[0072] The above description takes the garden work scene as an example, in fact, there are many work scenes that have high requirements for the working time or working efficiency of power tools, such as the work scene of using cleaning tools to provide cleaning services for each family or company, or the work scene of using mechanical processing or assembly power tools to process parts or assemble equipment, etc. In order to widely use electric tools in the above scenes, the main problem is how to improve the working time of electric tools.

[0073] In order to improve the working time of electric tools, one possible solution is to configure a large-capacity battery pack for the electric tool. However, although battery pack manufacturers have made a lot of research and efforts in the capacity and performance of battery packs, the performance of the current large-capacity battery packs is still not satisfactory, and the working time of the electric tool cannot be improved to a satisfactory degree.

[0074] The current large-capacity battery pack mainly has the following problems.

[0075] In the first aspect, in the field of power tools, the capacity of the single battery cell in the large-capacity battery pack on the market is generally small (generally less than 5AH). In order to increase the capacity of the battery pack, the common practice of the battery pack manufacturer is to increase the number of single battery cells in the battery pack. For example, the number of single battery cells in the large-capacity battery pack commonly seen on the market is generally more than 30. However, the weight of the battery pack generally needs to be maintained within a reasonable range, so the increase in the number of single battery cells is limited, that is, the capacity of the battery pack is limited by increasing the number of single battery cells. For example, the mainstream large-capacity multi-cell battery pack on the market can store an electric quantity of generally not more than 300WH, which is still far from enough for power tools, especially high-power power tools. As an example, for a power tool with a rated power of 3kw, 300WH of electric quantity may be consumed in a few minutes, at most a few dozen minutes.

[0076] In the second aspect, in the field of power tools, the charge-discharge rate performance of the single battery cell in the large-capacity battery pack is generally low, and the charge-discharge cycle number is generally short. For example, the charge rate of the single battery cell of the large-capacity battery pack on the market is generally about 0.3C, and the discharge rate is generally about 1C. The low charge rate leads to a long charging time of the battery pack, and the low discharge rate limits the discharge power of the battery pack, thereby leading to low working efficiency of high-power power tools.

[0077] In the third aspect, the maximum charge-discharge cycle number (or cycle life) of the single battery cell in the large-capacity battery pack on the market is generally within 1000 times, and the low charge-discharge cycle number leads to a short service life of the battery pack, which needs to be replaced frequently, which undoubtedly increases the use cost of the power tool.

[0078] In the fourth aspect, the charging speed of the traditional large-capacity battery pack is slow. The reason why the charging speed of the battery pack is slow is that on the one hand, the performance of the single battery cell itself (such as the charge rate) is poor, and on the other hand, the charging device of the battery pack can provide low charging power. The charging device on the market generally needs to take power from the power socket. However, considering the safety reasons, the power consumption of the power socket is generally limited. For example, the power consumption of the power socket in North America is generally limited to within 1.8KW, and the power consumption of the power socket in Europe is generally limited to within 3.6KW. Due to the limitation of the power of the power socket, the charging device on the market cannot charge the battery pack at high power. Once the electric quantity of the large-capacity battery pack is consumed, the battery pack generally needs to be charged for a long time (much longer than the endurance time provided by the battery pack).

[0079] Fifthly, if the user needs to use the power tool for a long time in the outdoor or the place without the city power socket, once the battery pack is out of power, the work will be forced to stop due to the inability to supplement the power in time. Of course, in order to meet the power supply of the power tool for a long time, the user can purchase many spare battery packs. However, a large number of battery packs are inconvenient to carry on the one hand, and will bring huge cost pressure on the other hand. Considering the above two points, it can be seen that this solution is actually not feasible.

[0080] As can be seen from the above, due to the small discharge power, slow charging speed, short service life, and inconvenient charging of the traditional large-capacity battery pack, the power tool cannot be widely used in the scene with high requirements for rated power and working time. It is also because of the above reasons that in many power tool fields, especially in the field of commercial power tools, although the fuel power tool has obvious defects, it is still the first choice of the user, and the electric power tool is usually used as an auxiliary tool.

[0081] It is generally believed that the power anxiety problem of the electric power tool is the natural defect of the electric power tool compared with the fuel power tool, and the above problem cannot be solved in the short term unless the battery pack technology has made a great leap.

[0082] The embodiments of the present application provide a different problem solving idea, which makes the electric power tool have the ability to work continuously 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 power tool does not need to worry about the problem of insufficient power supply in this period of time. The problem solving idea helps to truly realize the overall conversion of the fuel power tool to the electric power tool. The working system and the working method will be described in detail below in combination with different embodiments.

[0083] Example One: Work System

[0084] As shown in Figure 1 , the working system 1 provided by the embodiment one can include an electric power tool system 2, a battery pack system 3, and a charging system 4.

[0085] The electric power tool system 2 can include one or more electric power tools (1, 2, …, N). Figure 1 N electric power tools are shown, and N is a positive integer not less than 1. For example, if the working content required to be executed by the electric power tool system is single, and can be completed by one type of electric power tool, at this time, only one electric power tool can be configured for the user of the working system 1. For another example, if the working content required to be executed by the electric power tool system 2 is diverse, and needs to be completed by multiple electric power tools in cooperation, in this case, multiple electric power tools can be configured for the user of the working system 1.

[0086] For example, the garden maintenance work can include mowing, pruning, edging, blowing, and the like. Figure 2 An example of the power tool system 2 that can be configured for a user of the work system 1 for garden maintenance work is shown. The power tool system 2 can include four power tools, namely a mower 21, a trimmer 22, an edger 23, and a blower 24.

[0087] Referring back to Figure 1 , the types of the power tools in the power tool system 2 can be determined according to the work content of the power tool system 2. For example, the power tools in the power tool system 2 can be garden tools (sometimes also referred to as garden power tools or electric garden tools). The garden tools can include one or more of the following: an edger, a mower, a trimmer, a chainsaw, a blower, a leaf mulcher, a snow blower, and the like.

[0088] For example, the power tools in the power tool system 2 can be a plurality of electric cleaning tools. The electric cleaning tools can include a vacuum cleaner, a floor washing machine, and the like. Alternatively, for example, the power tools in the power tool system 2 can include a plurality of electric machining or assembly tools, such as an electric hammer, an electric drill, and the like.

[0089] The power tools in the power tool system 2 can be power tools with high power requirements. In the present application, such power tools are referred to as high-power power tools. In the prior art, the high-power power tools are characterized by a long recharging time after the battery pack is depleted, but a short discharge time (or endurance time) provided by the battery pack to the power tools. In some embodiments, the high-power power tools can refer to power tools with a rated power (or maximum working power) greater than 1 KW. For example, the high-power power tools can refer to power tools with a rated power of 1 KW to 3 KW.

[0090] Continuing to refer to Figure 1 , in order to meet the power supply requirements of the power tool system 2, the work system 1 is configured with a battery pack system 3. The battery pack system 3 can include a plurality of battery packs (4) Figure 1 M battery packs are shown, where M is a positive integer greater than 1. The plurality of battery packs can be used to supply power to the power tool system 2 alternately.

[0091] The number of battery packs in the battery pack system 3 can be configured to be no less than twice the number of battery packs required for the power tool system 2 to work. The number of battery packs required for the power tool system 2 to work can be understood as the maximum number of battery packs that the power tool system 2 needs to use at the same time when working.

[0092] Taking garden maintenance work as an example, such as Figure 2 As shown, power tool system 2 may include a lawnmower 21, a pruning machine 22, a mower 23, and a blower 24. At each garden, worker A uses lawnmower 21 to mow the lawn. While worker A is mowing, worker B will sequentially perform mowing, pruning, and blowering (worker A's work can also be replaced by an automatic lawnmower). For this type of work, lawnmower 21 itself requires a battery pack for power. Since the pruning machine 22, mower 23, and blower 24 operate sequentially, they can share a single battery pack. Therefore, in this example, the power tool system 2 requires a maximum of two battery packs to operate. Thus, battery pack system 3 may include four battery packs, such as... Figure 2 Battery packs 31, 32, 33 and 34 are shown.

[0093] Of course, the above is just one example of the configuration of the battery packs in the battery pack system 3. This application's embodiments are not limited to this, as long as the battery packs in the battery pack system 3 can meet the alternating power supply needs of the power tool system 2. For example, in some embodiments, the number of battery packs in the battery pack system 3 can be set to more than twice the number of battery packs required when all the power tools in the power tool system 2 are working simultaneously, regardless of the working sequence of the power tools. Still using... Figure 2 For example, since the lawnmower 21, pruning machine 22, mower 23, and blower 24 each require a battery pack to operate, a total of four battery packs are needed when these four power tools are working. Therefore, the number of battery packs in the battery pack system 3 can be configured to be 8. However, this method of determining the number of battery packs may result in some redundant battery packs. Therefore, preferably, the number of battery packs in the battery pack system 3 can be set to twice the number of battery packs required when the power tool system 2 is working. This configuration of the number of battery packs allows multiple battery packs to alternately power the power tool system 2 with a minimum number of battery packs, thereby reducing the cost of the battery pack system 3.

[0094] As mentioned earlier, the multiple battery packs within the battery pack system 3 can be used to alternately power the power tool system 2. In practice, these multiple battery packs can be divided into multiple groups. The number of battery packs in each group can be equal to the number of battery packs required for the power tool system 2 to operate. Then, these multiple groups of battery packs can be used to alternately power the power tool system 2.

[0095] The grouping manner of the plurality of battery packs is not limited in the embodiments of the present application. As an example, the plurality of battery packs can be divided into groups in advance, and in actual use, the groups are alternately used to supply power to the power tool system 2. As another example, the plurality of battery packs can not be grouped in advance. For example, when the power tool system 2 needs to be used, the user can select some battery packs from the plurality of battery packs to supply power to the power tool system 2, and the selected battery packs naturally form a group of battery packs. When the group of battery packs is discharged, the user of the power tool system 2 can select some battery packs from the remaining battery packs to supply power to the power tool system 2, and the selected battery packs naturally form another group of battery packs. Of course, if the number of the plurality of battery packs is twice the number of battery packs required for the power tool system 2 to work, when the user randomly selects some battery packs from the plurality of battery packs to supply power to the power tool system 2 for the first time, the plurality of battery packs are naturally divided into two groups of battery packs.

[0096] The plurality of battery packs alternately (or in turn) supplying power to the power tool system 2 means that after a group of battery packs is discharged, a group of battery packs is selected from the remaining battery packs in the charged state to continue supplying power to the power tool system 2. The plurality of groups of battery packs can alternately supply power to the power tool system 2 in a certain order. For example, assuming that the plurality of battery packs are divided into K groups, the plurality of battery packs can be alternately used to supply power to the power tool system 2 in the following manner: the first group to the Kth group of battery packs are used in turn to supply power, and after the Kth group of battery packs is used to supply power, the first group to the Kth group of battery packs are used in turn to supply power.

[0097] It should be noted that in the process of the plurality of groups of battery packs alternately supplying power to the power tool system 2, the embodiments of the present application do not require that a group of battery packs is replaced by another group of battery packs at the same time. In other words, the time when the battery packs in the same group are replaced can be the same or different, as long as the replacement of a group of battery packs by another group of battery packs is finally achieved.

[0098] For example, the battery pack system 3 includes a first group of battery packs and a second group of battery packs, wherein the first group of battery packs includes battery pack A and battery pack B, and the second group of battery packs includes battery pack C and battery pack D. It is assumed that the power tool system 2 is powered by the first group of battery packs first, but due to the difference in discharge speed of different power tools in the power tool system 2, battery pack A discharges faster and battery pack B discharges slower. When battery pack A is discharged, battery pack C in the second group of battery packs can be used to replace battery pack A first. Then, when battery pack B is discharged, battery pack D in the second group of battery packs can be used to replace battery pack B. Through the above replacement process of the battery packs, it can be seen that battery pack C and battery pack D do not replace battery pack A and battery pack B at the same time, but as a whole, it can still be understood that the second group of battery packs replaces the first group of battery packs and continues to power the power tool system 2.

[0099] After the battery packs in the battery pack system 3 are discharged, if the power cannot be replenished in time, the power tool system 2 cannot be powered alternately. Therefore, referring back to Figure 1 , in order to meet the power replenishment needs of the battery pack system 3, the working system 1 is also configured with a charging system 4 (or charging device). The battery pack system 3 and the charging system 4 together can be referred to as a power supply system or a power replenishment system of the power tool system 2.

[0100] The charging system 4 can be a generator or a storage type charging system. The generator can be a generator using solar energy or a generator using mechanical energy. The storage type charging system can store a certain amount of electricity in its internal storage, and then use the electricity to charge external devices. Embodiment three below will illustrate the structure of the storage type charging system in detail, and embodiment one mainly introduces it from the functional level.

[0101] During the operation of the power tool system 2, the power tool system 2 will occupy a group of battery packs in the battery pack system 3, and the battery packs not occupied by the power tool system 2 are referred to as battery packs in an idle state. The charging system 4 can charge the battery packs in the idle state.

[0102] It is noted that in some cases, some of the battery packs in the idle state can have sufficient power and do not need to be charged. For example, when the power tool system 2 is initially operated, the multiple sets of battery packs can all be in a full power state, and even if there are battery packs in the idle state, they do not need to be charged. Therefore, the embodiments of the present application do not require the charging system 4 to charge all the battery packs in the idle state. If all the battery packs in the idle state are insufficient, the charging system 4 can charge all the battery packs in the idle state; if the battery packs in the idle state include both insufficient battery packs and battery packs in the full power state, the charging system 4 can only charge the insufficient battery packs.

[0103] It is mentioned above that the embodiments of the present application hope that the power tool system 2 has the ability to continuously operate for a long period of time (such as a day). To achieve this, the charging capability of the charging system 4 to the battery pack system 3 during the operation of the power tool system 2 is not less than the discharging capability of the battery pack system 3 to the power tool system 2. Alternatively, the charging speed (or average charging speed) of the charging system 4 to the battery pack system 3 during the operation of the power tool system 2 is not less than the discharging speed (average discharging speed) of the battery pack system 3 to the power tool system 2.

[0104] During the operation of the power tool system 2, since the charging speed of the charging system 4 to the battery pack system 3 is not less than the discharging speed of the battery pack system 3 to the power tool system 2, the amount of power input by the charging system 4 to the battery pack system 3 is not less than the amount of power output by the battery pack system 3 to the power tool system 2, so that the battery pack system 3 as a whole can be guaranteed not to be in a situation of insufficient power due to the consumption of power by the power tool system 2. In other words, during the operation of the power tool system 2, the charging of the charging system 4 to the battery pack system 3 ensures that the battery pack system 3 as a whole is always in a powered state (or a state capable of supplying power to the power tool system 2). For example, the charging of the charging system 4 to the battery pack system 3 ensures that at least one set of battery packs in the battery pack system 3 is always in a powered state during the operation of the power tool system 2.

[0105] It is noted that during the operation of the power tool system 2, the charging system 4 does not directly charge the entire battery pack system 3, but charges the battery packs in the idle state in the battery pack system 3. Therefore, the "charging capability or charging speed of the charging system 4 to the battery pack system 3" mentioned above can be indirectly measured by the charging speed of the charging system 4 to the battery packs in the idle state. For example, if the charging speed of the charging system 4 to a single battery pack is faster, and / or the number of battery packs that can be simultaneously charged by the charging system is larger, it means that the charging speed of the charging system 4 to the battery pack system 3 is faster.

[0106] Similarly, during the operation of the power tool system 2, the battery pack system 3 does not discharge the power tool system 2 as a whole, but a group of battery packs from the battery pack system 3 is selected to discharge the power tool system 2. Therefore, the discharge capacity or discharge speed of the battery pack system 3 to the power tool system 2 mentioned above can be indirectly measured by the discharge speed of the battery packs selected to discharge the power tool system 2. For example, the more the number of battery packs required by the power tool system 2 during operation, and / or the faster the discharge speed of a single battery pack during use, the faster the discharge speed of the battery pack system 3 to the power tool system 2.

[0107] It should also be noted that the embodiment of the present application does not require the charging speed of the charging system 4 to the battery pack system 3 to be less than the discharge speed of the battery pack system 3 to the power tool system 2 at all times. For example, during the initial stage of using the power tool system 2, all battery packs in the battery pack system 3 can be in a fully charged state, and in this case, the embodiment of the present application does not require the charging speed of the charging system 4 to the battery pack system 3 to be less than the discharge speed of the battery pack system 3 to the power tool system 2. Therefore, the charging speed of the charging system 4 to the battery pack system 3 mentioned in the embodiment of the present application is considered from the entire operation of the power tool system 2, for example, the average charging speed of the charging system 4 to the battery pack system 3 is not less than the average discharge speed of the battery pack system 3 to the power tool system 2, to ensure that the power of the battery pack system 3 will not be reduced to a power level that cannot meet the power supply requirements of the power tool system 2.

[0108] There are many ways to achieve the charging speed of the charging system 4 to the battery pack system 3 not less than the discharge speed of the battery pack system 3 to the power tool system 2. For example, as one possible implementation, the charging power of the charging system 4 can be configured so that the charging speed of the charging system 4 to any battery pack is not less than the discharge speed of the battery pack to the power tool in the power tool system 2. The discharge speed of the battery pack to the power tool can be the average discharge speed of the battery pack to the power tool, or the maximum discharge speed of the battery pack to the power tool (the discharge speed of the battery pack at the maximum working power of the power tool). In other words, the charging speed of the charging system 4 to the battery pack and the discharge speed of the battery pack to the power tool can be configured so that the full charging time of the battery pack is not less than the empty charging time of the battery pack.

[0109] For example, the battery pack system 3 includes two groups of battery packs, and both groups of battery packs are in full charge at the initial working stage of the power tool system 2. At this time, the first group of battery packs can be used to supply power to the power tool system 2. After the first group of battery packs is discharged, the second group of battery packs can be used to replace the first group of battery packs, and the charging system 4 can be used to charge the first group of battery packs with insufficient power. In this example, the charging speed of the charging system 4 can be configured such that the charging speed of the charging system 4 for any battery pack is not less than the discharging speed of the battery pack for the power tool. In this way, after the second group of battery packs is discharged, the first group of battery packs has been fully charged, and the power tool system 2 can continue to be powered.

[0110] Of course, the above-mentioned implementation is an example, and the embodiments of the present application do not require that the charging speed of the charging system 4 for a single battery pack be greater than the discharging speed of the battery pack for the power tool. In some cases, even if the charging speed of the charging system 4 for a single battery pack is less than the discharging speed of the battery pack for the power tool, as long as the number of groups of battery packs and the number of charging interfaces or charging channels of the charging system 4 are reasonably set, uninterrupted power supply of the power tool system 2 can still be achieved.

[0111] For example, the battery pack system 3 includes three groups of battery packs, and all three groups of battery packs are in full charge at the initial working stage of the power tool system. The first group of battery packs can be used to supply power to the power tool system 2. After the first group of battery packs is discharged, the second group of battery packs can be used to replace the first group of battery packs to continue to supply power to the power tool system 2, and the charging system 4 can be used to charge the first group of battery packs with insufficient power. After the second group of battery packs is discharged, the third group of battery packs can be used to replace the second group of battery packs to continue to supply power to the power tool system 2, and the charging system 4 can be used to charge the second group of battery packs with insufficient power. In this example, the charging system 4 does not require that the first group of battery packs be fully charged when the charging system 4 starts to charge the second group of battery packs. In fact, the charging system 4 can simultaneously charge the first group of battery packs and the second group of battery packs, as long as the charging system 4 can fully charge the first group of battery packs when the third group of battery packs is discharged. As can be seen, if three groups of battery packs are configured for the power tool system 2, and the charging system 4 can support simultaneous charging of two groups of battery packs, even if the charging speed of the charging system 4 for a single battery pack is set to half of the discharging speed of the battery pack for the power tool, uninterrupted power supply of the power tool system 2 can still be achieved.

[0112] For ease of understanding, the following describes the embodiments of the present application in conjunction with Figures 2-4Taking garden maintenance as an example, the working method of the above-mentioned work system will be illustrated. It should be understood that this working method can be implemented by users of garden power tools. These users could be, for example, gardeners or gardening companies.

[0113] First, in order to successfully complete the garden maintenance work, a suitable power tool system can be configured according to the work content of the garden maintenance work. Figure 2 An example of a power tool system 2 that may be used for garden maintenance is given. The power tool system 2 may include four garden power tools: a lawnmower 21, a pruning machine 22, a lawn trimmer 23, and a hair dryer 24.

[0114] Next, a battery pack system 3 and a charging system 4 can be configured according to the number of garden power tools in power tool system 2 and the working sequence of each power tool. For example... Figure 2 As shown, for the power tool system 2 consisting of lawnmower 21, pruning machine 22, mower 23, and blower 24, four battery packs 31, 32, 33, and 34 can be configured in the battery pack system 3. These four battery packs can be divided into two groups of two battery packs each. After configuring all the components of the working system, the system can be used to begin operation.

[0115] like Figure 3 As shown, the user of working system 2 can first come to the first garden and use multiple gardening power tools to tidy it up. During the tidying process, the first battery pack can be used for power supply.

[0116] by Figure 4 For example, upon arriving at the first garden, worker A can install battery pack 31 on lawnmower 21 and manually push the lawnmower 21 to mow the grass (of course, if a smart lawnmower is used, it can perform worker A's work). Worker B uses a backpack frame to carry battery pack 32 on their back and uses it to power the lawn mower 23, pruning machine 22, and blower 24 in sequence, thus completing the mowing, pruning, and blowering work in sequence. Generally, the time spent mowing is roughly equivalent to the total time spent on mowing, pruning, and blowering. For a garden of about 1000 square meters, it can be completed in about 20-40 minutes.

[0117] After the First Garden was renovated, see Figure 3 Users of working system 1 can move to the second garden. For example, users can retract the various components of the working system back into the vehicle. Figure 3The charging system 4 (not shown, which can be installed on the vehicle) is started, and the vehicle is driven to the second garden. In the second garden, the multiple garden electric tools can be used to continue to trim the second garden. The second garden can be trimmed in a similar manner to the first garden, which will not be described again, and the difference between the two is that the electric tool system 2 is powered by the second set of battery packs 33, 34 during the trimming of the second garden.

[0118] After the first garden is trimmed and before the second garden is trimmed, the first set of battery packs can be charged by the charging system 4, so that the first set of battery packs is charged to a full state before the second garden is trimmed. In this way, the first set of battery packs can be used again for subsequent garden trimming work. Of course, the application embodiment does not specifically limit the charging start time of the first set of battery packs, and the first set of battery packs can be charged during the vehicle driving process. Alternatively, the charging of the first set of battery packs can be started when the second garden is started to be trimmed.

[0119] Taking the garden trimming work as an example, from the perspective of a single battery pack, the charging speed and discharging speed of the battery pack system 3 by the charging system 4 mentioned in the foregoing can be defined in one or more of the following ways:

[0120] When the number of battery packs in the battery pack system 3 is twice the number of battery packs required for the operation of the electric tool system 2, assuming that the time required for a single battery pack to charge from an empty state to a full state is t1, and the time required for a single battery pack to discharge from a full state to an empty state is t2, the charging speed and discharging speed of the battery pack system 3 by the charging system 4 satisfy: t1≤t2;

[0121] When the number of battery packs in the battery pack system 3 is N times (N>2) the number of battery packs required for the operation of the electric tool system 2, assuming that the time required for a single battery pack to charge from an empty state to a full state is t1, and the time required for a single battery pack to discharge from a full state to an empty state is t2, the charging speed and discharging speed of the battery pack system 3 by the charging system 4 satisfy: t1≤t2×N;

[0122] When the number of battery packs in the battery pack system 3 is twice the number of battery packs required for the electric tool system 2 to work, assuming that the time required for a single battery pack to be charged from an empty state to a full state is t1, the time required for a single battery pack to be discharged from a full state to an empty state is t2, and the time required for a trip from one garden to another is t3, the charging speed and discharging speed of the charging system 4 to the battery pack system 3 satisfy: t1≤t2+t3. t3 can be set according to actual conditions, for example, if one garden is usually close to another, t3 can be set to 0; if one garden is usually far from another, such as an average of one hour's drive, t3 can be set to one hour.

[0123] When the number of battery packs in the battery pack system 3 is N times (N>2) the number of battery packs required for the electric tool system 2 to work, assuming that the time required for a single battery pack to be charged from an empty state to a full state is t1, the time required for a single battery pack to be discharged from a full state to an empty state is t2, and the time required for a trip from one garden to another is t3, the charging speed and discharging speed of the charging system 4 to the battery pack system 3 satisfy: t1≤t2×N+t3. t3 can be set according to actual conditions, for example, if one garden is usually close to another, t3 can be set to 0; if one garden is usually far from another, such as an average of one hour's drive, t3 can be set to one hour.

[0124] The foregoing describes the working system and the working method provided by the present application in conjunction with Embodiment One. As can be seen from the description of Embodiment One, to use the working system 1, a suitable battery pack needs to be configured for the working system. One possible battery pack configuration is to select a large-capacity battery pack already on the market. However, as described above, the large-capacity battery pack on the market has many defects in terms of capacity, charging and discharging rate, service life, etc. Selecting such a battery pack may enable uninterrupted power supply of the electric tool system, but may result in low working efficiency and high cost of the entire working system.

[0125] The battery pack provided by the present application will be described in detail in conjunction with Embodiment Two. It should be understood that Embodiment Two and Embodiment One can be combined with each other. In other words, the battery pack mentioned in Embodiment Two can be applied to any working system or working method described in Embodiment One.

[0126] Example Two: Battery Pack

[0127] As mentioned above, the capacity of a conventional large-capacity battery pack is generally no more than 300WH. However, 300WH is relatively low, and the power is quickly consumed by the power tool, which increases the frequency of replacing the battery pack. The high frequency of replacing the battery pack not only wastes working time and affects work efficiency, but also shortens the service life of the battery pack. In order to alleviate this problem, the embodiments of the present application provide a battery pack with a capacity of no less than 500WH (such as 600WH).

[0128] Taking garden trimming work as an example, generally speaking, the trimming time of a garden is 20-40 minutes, and a battery pack with a capacity of no less than 500WH can basically ensure that the battery pack does not need to be replaced during the trimming of a garden. In this way, the user can replace the battery pack on the way to another garden, so that the replacement of the battery pack does not affect the work efficiency.

[0129] As mentioned above, the number of single cells in a conventional large-capacity battery pack is generally more than 30, which can cause the weight of the battery pack to be too heavy. The embodiments of the present application design the number of cells in the battery pack to be no more than 15, and the capacity of the single cells in the battery pack is no less than 10AH, so that the weight of the battery pack is not too heavy on the premise of ensuring the capacity of the battery pack.

[0130] As an example, the capacity of the battery pack can be designed to be greater than 500WH, and the number of cells in the battery pack is controlled to be no more than 15, which can not only avoid the weight of the battery pack being too heavy, but also to a certain extent avoid the need to frequently replace the battery pack due to the small capacity of the battery pack. As can be seen, this design of the battery pack can balance the weight and work efficiency of the battery pack.

[0131] The rated voltage (or voltage platform) of the battery pack can be designed according to the working voltage (or voltage platform) of the power tool. The rated voltage of the battery pack generally needs to match the working voltage of the power tool. In some embodiments, the rated voltage of the battery pack can be designed to be higher, for example, no less than 40V. As a specific example, the rated voltage of the battery pack can be designed to be 60V. Under the condition of a certain discharge rate, designing the rated voltage of the battery pack to be higher can improve the discharge power of the battery pack, so as to support the power tool to work at a larger power.

[0132] The discharge power of the battery pack can be determined according to the needs of the power tool. In some embodiments, the discharge power of the battery pack can be set to be no less than the maximum working power of the power tool. As an example, the discharge power of the battery pack can be set to be 3KW.

[0133] As mentioned above, the charging rate of the single battery cell in the large-capacity battery pack on the market is usually about 0.3C, and the discharging rate is usually about 1C. Such charging and discharging rates will result in slow charging and discharging speeds of the battery pack, thereby affecting the working efficiency.

[0134] In the embodiments of the present application, the maximum continuous charging rate and / or the maximum continuous discharging rate of the single battery cell in the battery pack are designed to be no less than 3C, so as to significantly improve the charging speed and the discharging speed of the battery pack. 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 continuous discharging rate refers to the maximum discharging rate that the battery pack can always maintain in the continuous discharging process from the full state to the empty state. That is, the battery pack can always be charged at a charging rate of no less than 3C in the continuous charging process, and the battery pack can always be discharged at a discharging rate of no less than 3C 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 less than 5% 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 more than 95% of the rated capacity of the battery pack.

[0135] Specifically, since the smaller the internal resistance of the single battery cell is, the higher the charging and discharging rate of the single battery cell is, in order to improve the charging rate and / or the discharging rate of the single battery cell, a 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 process. As an example, the rated voltage of the battery pack can be designed to be no less than 40V, and the maximum continuous charging rate and the maximum continuous discharging rate of the battery pack are both designed to be no less than 4C. As another example, the maximum continuous charging rate and the maximum continuous discharging rate of the battery pack can also be configured to be both no less than 5C. Such a design can ensure that the battery pack can support high-power charging and high-power discharging. Therefore, by using this design, the battery pack can be fast charged and fast discharged during operation, so that the entire working system can work uninterruptedly at a high efficiency.

[0136] Further, the configuration of the internal resistance of the single battery cell of the battery pack makes the maximum continuous charging rate of the battery pack no less than the maximum continuous discharging rate of the battery pack, so that the charging speed of the battery pack is no less than the discharging speed of the battery pack. That is, in the present application, the maximum continuous charging rate of the battery pack is no less than the maximum continuous discharging rate, and both the maximum continuous charging rate and the maximum continuous discharging rate of the battery pack are no less than 3C, so that the charging capacity and the discharging capacity of the battery pack are much greater than those of the common battery pack on the market.

[0137] As mentioned above, the maximum number of charge-discharge cycles of the large-capacity battery pack on the market is generally less than 1000, and the maximum number of charge-discharge cycles of the common large-capacity battery pack is between 300 and 500. The low number of charge-discharge cycles will result in a short service life of the battery pack, and the battery pack needs to be replaced frequently, which undoubtedly increases the use cost of the working system. Taking the garden trimming work as an example, generally speaking, a gardener needs to complete the trimming of 10-20 gardens in a day. Assuming that the gardener prepares two groups of replaceable battery packs, and replaces the battery pack after trimming each garden, then in a day, a battery pack needs to be charged and discharged about 8 times. If a large-capacity battery pack with a maximum number of charge-discharge cycles between 300 and 500 is used, a new battery pack needs to be purchased after a few months at most, which will obviously result in a high cost of the working system.

[0138] In order to solve the above problems, the maximum number of charge-discharge cycles of the single battery cell in the battery pack is designed to be not less than 3000 in the embodiments of the present application, preferably, the maximum number of charge-discharge cycles of the single battery cell is not less than 5000, so as to ensure the service life of the battery pack. Even if a battery pack needs to complete 8-10 charge-discharge cycles a day, 5000 charge-discharge cycles can make the service life of the battery pack reach two years, thereby reducing the cost of the entire working system.

[0139] In addition, the maximum number of charge-discharge cycles of the single battery cell in the battery pack is designed to be not less than 5000, which is of particular importance to the working scene that needs a high number of charge-discharge of the battery pack in a day (such as the scene that a gardener trims 10-20 gardens a day), and there is usually no such demand in ordinary working scenes.

[0140] It is mentioned in embodiment one that the present application aims to enable the electric tool system to have the ability of uninterrupted work. In order to enable the electric tool system to have this ability, the embodiments of the present application require multiple groups of battery packs to be charged and discharged alternately. During the process of charging and discharging the multiple groups of battery packs alternately, if the battery pack is not temperature controlled (or temperature managed), two problems may occur. First, in a low-temperature working scene (such as outdoors), the battery pack may be too cold, resulting in that the battery pack cannot start charging or discharging immediately. Second, the temperature of the battery pack will rise during the charging and discharging process of the battery pack. If the temperature of the battery pack is too high and exceeds the preset temperature threshold, the charging system may need to wait for the temperature of the battery pack to drop before charging the battery pack, resulting in the interruption of the charging process of the battery pack. If the above two problems occur, it may result in that the electric tool system cannot work uninterruptedly for a period of time, thereby reducing the performance of the working system.

[0141] To solve this problem, in some embodiments, a heating device and / or a heat dissipation device can be configured for the battery pack. The heating device can avoid the battery pack temperature being too low, so that the battery pack can start charging or discharging immediately even in cold weather. The heat dissipation device can avoid the battery pack from being too hot to some extent. Therefore, configuring the heating device and / or the heat dissipation device for the battery pack can improve the uninterrupted working performance of the power tool system to some extent.

[0142] Some power tools (such as handheld power tools) do not have a mounting portion for the battery pack. The power supply of such power tools can be achieved by using a back frame (or called a carrying device), that is, the user can carry the battery pack by using the back frame, thereby supplying power to the power tool. The conventional back frame and the battery pack are designed in one body, which limits the use of the battery pack.

[0143] The embodiments of the present application adopt a separate design for the battery pack and the back frame, that is, the back frame (which can also belong to the working system mentioned in the foregoing) and the battery pack are detachably connected. Figure 5 For example, the battery pack 31 can be separated from the back frame 5 or assembled together. When it is needed to supply power to a handheld power tool (such as a trimmer 22, a grass trimmer 23, a blower 24, etc. in Figure 4 , by using the battery pack 31, the battery pack 31 can be mounted to the back frame 5, and then electrically connected to the handheld power tool through the interface 51 on the back frame 5. When it is needed to supply power to a non-handheld power tool by using the battery pack, the battery pack is mounted to the battery pack mounting portion of the non-handheld power tool, thereby supplying power to the non-handheld power tool. For example, Figure 4 and Figure 6 , the battery pack can be mounted to the grass trimmer in the manner shown in Figure 6 , and then the worker can push the grass trimmer to perform the grass cutting work in the manner shown in Figure 4 .

[0144] The advantage of the separate design of the battery pack and the back frame is that the battery pack can be mounted to the power tool to work, or can supply power to the power tool through the back frame, thereby making the use of the battery pack more flexible.

[0145] The foregoing describes the charging system 4 provided by the present application from the functional point of view in combination with the first embodiment. In the following, the structure of the charging system 4 is described in more detail by taking the energy storage type charging system 4 as an example in combination with the third embodiment. It should be understood that the third embodiment and the first and second embodiments can be combined with each other, in other words, the charging system 4 mentioned in the third embodiment can be applied to any working system or working method described in the first embodiment, and can also be used in cooperation with any type of battery pack described in the second embodiment.

[0146] Example Three: Energy Storage Charging System

[0147] Energy storage charging systems internally store electrical energy (or electrical quantity). If a working system uses an energy storage charging system, the process of the battery pack system alternately supplying power to the power tool system can be understood as a process of power dispatching between the energy storage charging system and the power tool system, with the battery pack system acting as a medium. Since the energy storage charging system can store far more power than the battery pack system can hold, using it to power the power tool system can meet its power needs for a longer period. Furthermore, because the battery pack's capacity requirements are relatively small, its installation on the power tool does not make it too heavy. Through the coordinated power supply of the energy storage charging system and the battery pack, a balance between long battery life and lightweight operation becomes possible for the power tool system. The following section will combine... Figures 7-12 The structure of the energy storage charging system will be illustrated in more detail with examples.

[0148] like Figure 7 As shown, the energy storage charging system may include an energy storage unit 41, a first power conversion unit 42, and an output interface 43.

[0149] The energy storage unit 41 can be used to store electrical energy. For example, the energy storage unit 41 can use an energy storage component (or energy storage medium) to store energy. The energy storage component may include one or more of the following types of energy storage components: ternary lithium battery, lead-acid battery, supercapacitor, lithium iron phosphate battery, and hydrogen fuel cell.

[0150] In some embodiments, the power storage unit 41 may include one or more battery cells. If the power storage unit 41 includes multiple battery cells, the multiple battery cells may be connected in series, connected in parallel, or some of the battery cells may be connected in series and some of the battery cells may be connected in parallel.

[0151] In addition to the battery cells, the energy storage unit 41 may also include a battery management system for managing the battery cells. For example, the battery management system can detect the status of the battery cells and prevent overcharging or over-discharging.

[0152] This application embodiment does not specifically limit the amount of electricity that the power storage unit 41 can hold, and can be configured according to actual needs. For example, the power storage unit 41 can be configured so that its power can meet the power needs of the power tool system for a whole day of work. As mentioned above, this application embodiment enables the power tool system to work continuously for a relatively long period of time. If the power storage unit 41 can meet the power needs of the power tool system for a whole day of work, then the power tool system has the ability to work continuously throughout the day. In this way, the user can confidently use the power tool system to work all day, and then replenish the power storage unit 41 in the evening after work.

[0153] The specific amount of electricity that the power storage unit 41 can hold depends on the application scenario. Figure 2 and Figure 3 Taking the garden maintenance scenario shown as an example, generally speaking, a gardener or landscaping company needs to maintain 10-20 gardens per day. Therefore, the electricity required to maintain 10-20 gardens per day can be estimated first, and then the electricity storage unit 41 can be set to be greater than or equal to the estimated electricity. Generally, setting the electricity storage unit 41 to hold no less than 5 kWh is sufficient to meet the electricity requirements for maintaining 10-20 gardens. In some embodiments, the electricity storage unit 41 can be set to hold 10 kWh, 20 kWh, or 30 kWh or more.

[0154] A single battery pack carries less than one-eighth of the total power required by a landscaping team for a full day of work, meaning it carries less than one-eighth of the power stored in the energy storage unit. Since the energy storage charging system can meet the total power requirements of a commercial garden for a full day, and can fast charge the battery packs at a rate of at least 3C, a small number of small-capacity battery packs can provide uninterrupted power to the power tool system, reducing its operating costs. Furthermore, the small-capacity battery packs also reduce the weight of the power tool system.

[0155] In some embodiments, the amount of electricity that the power storage unit 41 can hold may be less than the power demand of the power tool system for a day's work. For example, the power storage unit 41 can be set to meet the power demand for half a day's work, so that the user can recharge the power storage unit 41 during lunch break. Alternatively, the amount of electricity that the power storage unit 41 can hold may be greater than the power demand for a day's work, so that the power storage unit 41 can be recharged every few days instead of every day.

[0156] The power storage unit 41 can include single cells. The charge and discharge rates of the single cells in the power storage unit 41 can be set according to the requirements of the charge and discharge speed of the charging system 4. The power storage unit 41 has relatively low requirements for the real-time performance of the charge and discharge compared to the battery pack. Therefore, in some embodiments, the charge and discharge rates of the single cells in the power storage unit 41 can be set to be relatively low, thereby reducing the cost of the cells.

[0157] It is mentioned in Embodiment Two that, in order to support the power tool to work at high power, the cells in the battery pack are preferably cells with small internal resistance to meet the higher charge and discharge rate requirements. Therefore, setting the charge and discharge rates of the single cells in the power storage unit 41 to be relatively low, such as less than the charge and discharge rates of the single cells in the battery pack, can make the two types of cells work together, thereby reducing the cost of the cells of the entire system.

[0158] As an example, the charge and / or discharge rates of the single cells in the power storage unit 41 can be set to be not greater than 1.5C, and preferably, the charge rate of the single cells in the power storage unit 41 is not greater than 1C and the discharge rate is not greater than 1.5C. For example, the charge rate of the single cells in the power storage unit 41 can be set to 1C and the discharge rate can be set to 1.5C. Then, the power storage unit 41 can store an amount of electricity of 5KWH. In this way, a charging pile (such as an alternating current charging pile or a direct current charging pile) can be used to charge the power storage unit 41 at a power of 5KW to charge the power storage unit 41 from an empty state to a full state within one hour.

[0159] The rated voltage (or voltage platform) of the power storage unit 41 can be set according to actual needs. For example, the rated voltage of the power storage unit 41 can be designed to be not less than 48V. Of course, the rated voltage of the power storage unit can also be designed to be not less than 80V.

[0160] Since the power storage unit stores a much larger amount of electricity than the battery pack, when the power storage unit charges the battery pack at a power of 5KW, the discharge power of the power storage unit is only 1C, and the capacity of the battery pack is much smaller than the capacity of the power storage unit, when the capacity of the battery pack is 500WH, the charging power of 5KW can support the battery pack to be quickly charged at a charge rate of 10C. Therefore, even if the discharge rate of the power storage unit is low, it can still support the battery pack to be quickly charged at a high rate. Further, the cell type of the power storage unit can be different from the cell type of the battery pack, specifically, the internal resistance of the cell of the power storage unit can be greater than the internal resistance of the cell of the battery pack, thereby reducing the cost of the power storage unit.

[0161] The first power conversion unit 42 can be electrically connected to the power storage unit 41. For example, the first power conversion unit 42 can be connected to the power storage unit 41 through a DC / DC converter, an AC / DC converter, a DC / AC converter, or the like.Figure 7 The wire harness 3 is shown to be in power and communication control connection with the power storage 41.

[0162] The first power conversion 42 can be configured to convert the power stored in the power storage 41 into a first charging power suitable for charging the battery pack. For example, the first power conversion 42 can include a DC / DC converter that can convert the direct current power output by the power storage 41 into a direct current power suitable for charging the battery pack. The first power conversion 42 can include one DC / DC converter or multiple DC / DC converters. When the first power conversion 42 includes multiple DC / DC converters, the multiple DC / DC converters can be designed to be electrically isolated or electrically non-isolated.

[0163] The output interface 43 can be electrically connected with the first power conversion 42. As shown, Figure 7 The output interface 43 can be electrically connected with the first power conversion 42 through the wire harness 4. The output interface 43 can output the first charging power to the outside to charge the battery pack.

[0164] The output interface 43 can charge one battery pack or multiple battery packs at the same time. As mentioned above, the battery pack system can include multiple groups of battery packs. Assuming that the output interface 43 can support N battery packs to be charged at the same time, in some embodiments, the number N can be set to be no less than the number of battery packs included in each group of battery packs.

[0165] The output interface 43 can include one charging channel or multiple charging channels, where each charging channel can be configured to charge one battery pack. The charging channel can use direct current to charge the battery pack, and thus the charging channel can also be referred to as a direct current charging channel.

[0166] The embodiments of the present application do not make specific limitations on the connection mode of the output interface 43 and the battery pack. As an example, Figure 7 As shown, the output interface 43 can provide external wire harnesses 5 (which can include wire harnesses 5-1 to 5-N) to the outside. The output interface 43 charges the battery pack through the external wire harnesses 5.

[0167] As another example, the output interface 43 can first be electrically connected with one or more charging bays 46 (which can include charging bays 46-1 to 46-N) through the wire harness 5. The number of charging bays 46 can be two, for example. The charging bays are designed to allow the battery pack to be conveniently installed in the charging system 4 for charging, and the whole process is safe and reliable. In addition, the design of the charging bays is also conducive to saving the space occupied by the charging system 4.

[0168] The output interface 43 can be internally provided with a control module. The control module can be electrically connected with the power interface and the communication interface in the charging bin 46 through the wire harness 5, so as to control the power and communication of the charging process of the battery pack. For example, the output interface 43 can interact with the battery pack in the charging bin 46 through the control module in one or more of the following operations: communication protocol interaction, charging process control, charging protection, etc.

[0169] The triggering interface can be provided in the charging bin 46. The triggering interface can be used to identify whether the object placed in the charging bin is a battery pack, and trigger the charging system 4 to charge the battery pack when it is confirmed that the object placed in the charging bin is a battery pack.

[0170] The charging bin 46 can charge the battery pack in a wired manner. Alternatively, in some embodiments, the charging bin 46 can also charge the battery pack in a wireless manner. Wireless charging can reduce the number of wire harnesses in the charging system 4 and reduce the weight of the charging system 4, so that the connection mode of the battery pack and the charging bin 46 is simpler.

[0171] Embodiment two mentions that in order to improve the charging speed of the battery pack, a single cell with a large charging rate can be configured for the battery pack, so that the battery pack can be charged at a large rate. During the large-rate charging process, if the temperature of the battery pack during the charging process is not controlled, the temperature of the battery pack may be high. The high temperature of the battery pack can cause two problems. First, during the charging process, if the temperature of the battery pack exceeds the preset temperature threshold, the charging system 4 can enter a charging protection state. Once the charging protection state is entered, the charging process of the battery pack will be forced to stop. Second, if the temperature of the battery pack is high after the charging is completed, the battery pack can need to wait for the temperature of the battery pack to drop before starting the discharging process of the battery pack. The above two problems can cause the work of the work system to be interrupted.

[0172] In order to avoid the above problems, the charging bin 46 can be provided with a temperature control function, so that the charging bin 46 can control the temperature of the battery pack during the charging process. For example, a heating device and / or a heat dissipation device can be provided in the charging bin 46. The heating device and / or the heat dissipation device can dynamically control the ambient temperature of the battery pack during the charging and discharging process of the battery pack, so as to ensure that the battery pack can be continuously charged, and also ensure that the battery pack can immediately start discharging to the electric tool after the charging is completed.

[0173] Continuing to refer to Figure 7 In some embodiments, the charging system 4 can also include an input interface 44. The input interface 44 can be used to receive input power (i.e., power input to the charging system 4 from the outside).

[0174] The embodiments of the present application do not make specific limitations on the source of the input power. The input interface 44 can be used to receive input power from a direct current power supply and / or an alternating current power supply. For example, the input interface 44 can support receiving input power from one or more of the following devices: a domestic or foreign mains socket, a direct current charging pile, an alternating current charging pile, a mobile power supply vehicle, and an energy storage cabinet (e.g., a large energy storage cabinet).

[0175] The input interface 44 can also include a communication control interface. Through the communication control interface, the input interface 44 can perform communication control and charging protocol negotiation with an external power supply. For example, the communication control interface can support multiple communication protocols, so that the input interface 44 can receive power from different types of power supplies, or so that the input interface 44 can be compatible with different types of power supply input methods. As an example, the input interface 44 can perform one or more of the following operations on a direct current charging pile or an alternating current charging pile: interface conversion, charging pile enable wake-up, communication protocol analysis, etc., so as to successfully guide the electrical energy of the charging pile to the power storage unit 41.

[0176] Continuing to refer to Figure 7 In some embodiments, the charging system 4 can also include a second power conversion unit 45. The second power conversion unit 45 can be electrically connected to the input interface 44. For example, the second power conversion unit 45 can be electrically connected to the input interface 44 through the wiring harness 1 in Figure 7 In some embodiments, the second power conversion unit 45 can be electrically connected to the input interface 44 through the wiring harness 1 in

[0177] The second power conversion unit 45 can convert direct current power into second charging power suitable for charging the power storage unit 41, to charge the power storage unit 41. For example, the second power conversion unit 45 can include a DC / DC converter. Using the DC / DC converter, the direct current power input by the input interface 44 can be converted into direct current power with a suitable voltage, and the converted direct current power can be used as the above-mentioned second charging power to charge the power storage unit 41. As another example, the second power conversion unit 45 can include an AC / DC converter. Using the AC / DC converter, the alternating current power input by the input interface 44 can be converted into direct current power, and the converted direct current power can be used as the above-mentioned second charging power to charge the power storage unit 41. Of course, the second power conversion unit 45 can simultaneously support conversion of direct current power and alternating current power into second charging power. For example, the second power conversion unit 45 can simultaneously include a DC / DC converter and an AC / DC converter.

[0178] Referring to Figure 8 In some embodiments, a direct charging channel (i.e., a direct charging path) can be provided between the input interface 44 and the power storage unit 41. Figure 8The charging channel in which the wire harness 1 is located). When the input interface 44 receives input power in the form of direct current, the second power conversion unit can be bypassed, and the direct current can be used to charge the power storage unit 41 directly. The direct current can be provided by a common direct current power source (such as a battery) or a direct current charging pile.

[0179] For example, some direct current charging piles support a direct charging module. Therefore, when the input interface 44 receives direct current input from such a direct current charging pile, the input interface 44 can perform interface conversion, charging pile enable wake-up, communication protocol analysis, and the like with the direct current charging pile, and negotiate with the direct current charging pile to use the direct charging mode for charging. After successful negotiation, the input interface 44 can bypass the second power conversion unit 45 and directly lead the input power from the direct current charging pile to the power storage unit 41 to charge the power storage unit 41 directly. Figure 7

[0180] By using the direct charging mode, the external input power does not need to be converted, and the charging efficiency of the charging system 4 can be improved.

[0181] As shown in FIG. 4, in some embodiments, the charging system 4 can support an AC inversion output mode. In this mode, the first power conversion unit 42 can convert the power stored in the power storage unit 41 into alternating current power and provide the alternating current power to the outside through the first alternating current output interface 47 of the output interface 43. For example, the first power conversion unit 42 can include a DC / AC converter. When the charging system 4 enters the AC inversion output mode, the first power conversion unit 42 can use the DC / AC converter to invert the direct current power stored in the power storage unit 41 into one or more alternating current powers (or AC powers) and provide the one or more alternating current powers to the outside through the first alternating current output interface 47. Figure 9 The first alternating current output interface 47 is configured to enable the charging system 4 to be used as an emergency power supply, a backup power supply, or an uninterruptible power supply (UPS), thereby expanding the functions of the charging system 4.

[0182]

[0183] Referring to FIG. 4, the charging system 4 can support an AC inversion output mode. In this mode, the first power conversion unit 42 can convert the power stored in the power storage unit 41 into alternating current power and provide the alternating current power to the outside through the first alternating current output interface 47 of the output interface 43. For example, the first power conversion unit 42 can include a DC / AC converter. When the charging system 4 enters the AC inversion output mode, the first power conversion unit 42 can use the DC / AC converter to invert the direct current power stored in the power storage unit 41 into one or more alternating current powers (or AC powers) and provide the one or more alternating current powers to the outside through the first alternating current output interface 47. Figure 10 ​​In some embodiments, the output interface 43 may further include a second AC output interface 48. The second AC output interface 48 can be used to output AC power when the input power of the input interface 44 is AC power. For example, when AC power is input through the input interface 44 (such as AC power provided by mains power or an AC charging pile), the charging system 4 can be set to AC output mode. In this AC output mode, the AC power received by the input interface 44 will be directly led to the second AC output interface 48 of the output interface 43, and the second AC output interface 48 will provide the AC power to the outside.

[0184] In some embodiments, the second AC output interface 48 can be used to charge the battery pack via a charger or a power adapter. For example, when the charging compartment of the charging system 4 is insufficient, the charger of the battery pack can be connected through the second AC output interface 48 to charge the battery pack, thereby enabling the charging system 4 to support the simultaneous charging of more battery packs. Furthermore, this embodiment requires the battery pack to be able to interface not only with the output interface 43 but also with a charger or power adapter, thus expanding the types of interfaces supported by the battery pack.

[0185] See Figure 11 In some embodiments, the charging system 4 may support a reverse charging mode for the battery pack (see [link]). Figure 11 (The direction indicated by the dashed arrow in the diagram). In other words, the charging device 4 can use the battery pack's charge to reverse charge the energy storage unit 4. For example, the first power conversion unit 42 can convert the charge stored in the battery pack into a third charging power suitable for charging the energy storage unit 41. Then, the first power conversion unit 42 can use this third charging power to charge the energy storage unit 41. As mentioned above, the first power conversion unit 42 may include a DC / DC converter. This DC / DC converter can convert the DC power output by the first power conversion unit 42 into DC power suitable for charging the battery pack. In order for the charging system 4 to support the battery pack reverse charging mode, the DC / DC converter in the first power conversion unit 42 can be selected as a bidirectional DC / DC converter, so that the DC / DC converter can not only convert the DC power output by the first power conversion unit 42 into DC power suitable for charging the battery pack, but also convert the DC power output by the battery pack into DC power suitable for charging the first power conversion unit 42.

[0186] As mentioned above, the charging devices in the market generally need to take power from the power socket. However, for safety, the power consumption of the AC socket is usually limited, which results in that the charging device cannot charge the battery pack at a high power. The charging system 4 provided by the embodiments of the present application uses the power storage unit 41 for power supply and is not limited by the power socket. Therefore, in some embodiments, the charging power of the charging system 4 can be specially customized and developed, so that the average charging power (or the maximum charging power) of the charging system 4 is greater than the limit of the power consumption of the power socket. In other words, the charging system 4 provided by the embodiments of the present application can break the limit of the charging power of the power supply to support the large-rate charging of the battery pack. For example, in North America, the charging power of the charging system 4 can be greater than 1.8KW, and in Europe, the charging power of the charging system 4 can be greater than 3.6KW.

[0187] Also, the average charging power of the battery pack by the charging system 4 is not less than the average discharging power of the battery pack to the power tool. Specifically, the average charging power of the battery pack by the charging system 4 refers to the average charging power of a single charging bin to a single battery pack. The average charging power is the average of the charging power input during the effective charging time of the battery pack from the empty state (e.g., below 5% SOC) to the full state (e.g., above 95% SOC), and the average discharging power is the average of the discharging power output during the effective discharging time of the battery pack from the full state (e.g., above 95% SOC) to the empty state (e.g., below 5% SOC). The effective charging time refers to the sum of the time during which the battery pack is in the charging state from the empty state to the full state, and the effective discharging time refers to the sum of the time during which the battery pack is in the discharging state 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 lasts for 1 hour, and the battery pack is charged for 20 minutes, the charge is Q1, rests for 20 minutes, and then is charged for another 20 minutes, the charge is from Q1 to the full state Q2, then during the entire charging process, the effective charging time of the battery pack is 40 minutes. The average charging power of the battery pack from the empty state to the full state should be the average of the average charging power of the battery pack at different charging times. In another example, when the charging process of the battery pack is a continuous process, i.e., the battery pack is continuously charged from the empty state to the full state without pausing, then the average charging power of the battery pack is the ratio of the charging capacity of the battery pack to the continuous charging time. Similarly, when the battery pack discharges from the full state to the empty state for 1 hour, and the battery pack discharges for 20 minutes, the charge is from Q2 to Q3, rests for 20 minutes, and then discharges for another 20 minutes, the charge is from Q3 to the empty state, then during the entire charging process, the effective discharging time of the battery pack is 40 minutes. The average discharging power of the battery pack from the full state to the empty state is the average of the average discharging power of the battery pack at different discharging times. In another example, when the discharging process of the battery pack is a continuous process, i.e., the battery pack is continuously discharged from the full state to the empty state without pausing, then the average discharging power of the battery pack is the ratio of the discharging capacity of the battery pack to the continuous discharging time.

[0188] In another embodiment, the ratio of the average charging power of the single charging bay to the single battery pack to the discharging rate of the single battery pack to the single power tool can be between 0.5 and 2. That is, the ratio of the average charging power to the average discharging power can 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 can be configured for one power tool to achieve uninterrupted power supply, wherein one battery pack is used as a working battery pack and the other two battery packs are used as standby battery packs. When the ratio of the average charging power to the average discharging power is 0.8, although the average charging power is slightly less than the average discharging power, since the user may not use the power tool continuously but intermittently during use, the standby battery pack can still be fully charged before the working battery pack is empty.

[0189] Preferably, the ratio of the average charging power to the average discharging power can be 1 to 2. Preferably, the ratio of the average charging power to the average discharging power can be 1 to 1.2. When the ratio of the average charging power to the average discharging power is greater than 1, even if the discharging process of the battery pack is continuous discharging, the standby battery pack can still be fully charged before the working battery pack is empty.

[0190] As an example, the average charging power of the charging system 4 to the single battery pack can be set to be no less than 2.4KW, and preferably, the average charging power of the charging system to the single battery pack can be set to be no less than 3KW. For example, the average charging power of the charging system to the single battery pack can be set to be 3KW, 4KW, 5KW or 6KW.

[0191] Further, since the average charging power of the battery pack is not less than the average discharging power, the effective charging time of the battery pack from empty to full is not greater than the effective discharging time of the battery pack from full to empty.

[0192] Further, the charging system 4 can support simultaneous charging of multiple battery packs. For example, the charging system 4 can support simultaneous charging of two battery packs, and the total charging power of the charging system 4 in a unit of time can reach more than 6KW.

[0193] Embodiment two mentions that the charging and discharging rate of the battery pack can be set to be no less than 3C. In this case, if the capacity of the battery pack is set to be 0.6KWH and the charging power of 3KW is used to charge the battery pack, the battery pack can be quickly charged to full in 20 minutes. Further, if the discharging speed of the power tool is also set to be 3KW, the battery pack can be discharged in the fastest 20 minutes. As can be seen, by using the above design, the charging speed and the discharging speed of the battery pack are equal, so that two sets of battery packs can achieve uninterrupted work of the power tool system.

[0194] Furthermore, when the battery pack's charging rate is set to no less than 4C, if the battery pack's capacity is set to 0.6 kWh and a charging power of 3 kW is used, the battery pack can be fully charged in 15 minutes. When the battery pack's charging rate is set to no less than 5C, if the battery pack's capacity is set to 0.6 kWh and a charging power of 3 kW is used, the battery pack can be fully charged in 12 minutes.

[0195] The charging system 4 mentioned in the embodiments of this application can be designed as a portable charging system (or a mobile charging system). Users can carry the charging system 4 with them and charge the battery pack anytime and anywhere.

[0196] See Figure 7 and Figure 12 In some embodiments, it can be Figure 7 The input interface 44 and the second power conversion unit 45 are integrated together to form a shape like Figure 12 The input interface and power conversion unit 44 are shown. Alternatively, in some embodiments, the input interface and power conversion unit 44 can be... Figure 7 The output interface 43 and the first power conversion unit 42 are integrated together to form a shape like Figure 12 The output interface and power conversion module 43 are shown. Of course, in some embodiments, the output interface and power conversion module 43 may also be shown. Figure 12 The input interface and power conversion unit 44, the power storage unit 41, and the output interface and power conversion module 43 are all integrated together.

[0197] It should be noted that the above example mainly illustrates the wired communication between the various components in the charging system 4 via a wiring harness, but the embodiments of this application are not limited to this. The various components in the charging system 4 and the communication between the various components and the battery pack can also be wireless.

[0198] The preceding sections, with reference to Embodiments 1 to 3, have described in detail the working system and its various components according to embodiments of this application. For ease of understanding, a specific example of the working system is given below with reference to Embodiment 4.

[0199] Example Four: One Specific Example of a Work System

[0200] like Figure 13 As shown, the charging system 4 in the working system is an energy storage charging system. The battery pack system in the working system includes four battery packs: battery pack 1, battery pack 2, battery pack 3, and battery pack 4. Battery packs 1 and 2 form one set of battery packs, and battery packs 3 and 4 form another set of battery packs. In this working system, the power tool system 2 includes multiple garden-type power tools, which require two battery packs for power during operation.

[0201] The battery pack system in the working system, the power of each battery pack is 0.6 KWH, the charging rate and the discharge rate are both 5C, the rated voltage is 60V and the maximum charge-discharge cycle is not less than 5000 times.

[0202] The charging system 4 is a portable charging system that can be carried around. The power storage part 41 in the charging system 4 can accommodate 10 KWH of power. The 10 KWH of power can basically meet the power demand of 10-20 gardens in a day. The power storage part 41 selects a lithium iron phosphate battery. The charging rate and the discharge rate of the battery are both 1C, and the rated voltage is 48V.

[0203] The power storage part 41 can be charged by a direct current charging pile or an alternating current charging pile. The charging pile can provide a charging power of 10KW, so as to realize fast charging of the power storage part 41 to a full power state within one hour.

[0204] The charging system 4 includes two DC charging compartments, namely charging compartment 46-1 and charging compartment 46-2. The charging power of a single DC charging compartment to a single battery pack is set to 3KW, so as to fast charge the battery pack to a full power state within 12 minutes.

[0205] The maximum working power of the garden electric tools is set to 3KW. Therefore, the garden electric tools can empty the power of the battery pack in the fastest 12 minutes. Since the charging time of a single battery pack is equal to the shortest discharge time of a single battery pack, the uninterrupted charging and discharging process of the entire working system can be ensured.

[0206] In the working project, the battery pack 1 and the battery pack 2 can be used to power the electric tool system 2 first. After the battery pack 1 and the battery pack 2 are used up, the battery pack 3 and the battery pack 4 can be used to continue to power the electric tool system 2, and the discharged battery pack 3 and the battery pack 4 are respectively put into the charging compartment 46-1 and the charging compartment 46-2 for charging. The above-mentioned alternating process is carried out until the garden maintenance work of a day is completed.

[0207] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A power supply system characterized by comprising: The power supply system comprises: a battery pack system comprising a plurality of battery packs for alternately supplying power to a power tool system, wherein the power tool system comprises one or more power tools; a charging system comprising: an electricity storage portion comprising one or more battery cells for storing electricity; an input interface connected to the one or more battery cells, the input interface being configured to receive input power for charging the battery cells, the input power being direct current power or alternating current power; a first power conversion portion electrically connected to the electricity storage portion, the first power conversion portion being configured to perform power conversion on the electricity stored in the electricity storage portion to output first charging power; an output interface electrically connected to the first power conversion portion, the output interface being configured to output electrical energy in the form of the first charging power to charge the battery packs; a single battery pack carries no more than one-eighth of the electricity that the electricity storage portion can accommodate.

2. The power supply system of claim 1, wherein: the electricity storage portion can accommodate no less than 5 KWH of electricity.

3. The power supply system of claim 1, wherein: the electricity storage portion can accommodate no less than 10 KWH, 20 KWH, or 30 KWH or more of electricity.

4. The power supply system of claim 1, wherein: the capacity of the battery pack is no less than 500 WH.

5. The power supply system of claim 1, wherein: the capacity of a single battery cell in the battery pack is no less than 10 AH, and the number of single battery cells in the battery pack is no more than 15.

6. The power supply system of claim 1, wherein: the charging rate of a single battery cell in the electricity storage portion is less than the charging rate of a single battery cell in the battery pack; and / or, the discharging rate of a single battery cell in the electricity storage portion is less than the discharging rate of a single battery cell in the battery pack.

7. The power supply system of claim 1, wherein: the charging rate of a single battery cell in the electricity storage portion is no more than 1.5C; and / or, the discharging rate of a single battery cell in the electricity storage portion is no more than 1.5C.

8. The power supply system of claim 1, wherein: the internal resistance of a single battery cell in the battery pack is configured such that the maximum continuous charging rate and / or the maximum continuous discharging rate of the battery pack is no less than 3C.

9. The power supply system of claim 1, wherein: the charging system comprises a plurality of charging bays electrically connected to the output interface, the charging bays being configured to hold the battery packs and charge the battery packs using the electrical energy output by the output interface.

10. A charging system characterized by comprising: The charging system for charging battery packs comprises: an electricity storage portion comprising one or more battery cells for storing electricity; an input interface connected to the one or more battery cells, the input interface being configured to receive input power for charging the battery cells, the input power being direct current power or alternating current power; a first power conversion portion electrically connected to the electricity storage portion, the first power conversion portion being configured to perform power conversion on the electricity stored in the electricity storage portion to output first charging power; An output interface is electrically connected with the first power conversion unit, and is configured to output electric energy at the first charging power to charge the battery pack. The electric quantity carried by a single battery pack is not greater than one eighth of the electric quantity that can be accommodated by the electric quantity storage unit.

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