Power supply system and charging system

Abstract

The utility model provides a power supply system, a working system and a charging system. The power supply system comprises a battery pack system which comprises a plurality of groups of battery packs and is used for alternately supplying power to an electric tool system, and the electric tool system comprises one or more electric tools; the charging system is used for charging a battery pack in an idle state in the battery pack system in the working process of the electric tool system, and the charging speed of the charging system to the battery pack system is not smaller than the discharging speed of the battery pack system to the electric tool system. The power supply system provided by the utility model can realize uninterrupted work of the electric tool system.

Description

[0001] This application is a divisional application of the Chinese utility model patent application filed by the applicant on June 16, 2022, entitled "Power Supply System, Working System and Charging System", with application number 202290000505.6. Technical Field

[0002] This application relates to the field of power tools, and more specifically, to the design of a power supply system, a working system, and a charging system. Background Technology

[0003] In some work scenarios, such as outdoor work, it is often necessary to use power tools to work continuously for extended periods of time. Therefore, the selection of the power source is the primary consideration for enabling uninterrupted operation of power tools.

[0004] Generally speaking, fuel-powered tools (hereinafter referred to as fuel-powered tools, such as gasoline-powered tools) can meet the requirements of long-term uninterrupted work. However, the main problems with fuel-powered tools are that the exhaust fumes they release pollute the environment, and the noise they produce during operation also contributes to noise pollution of the surrounding environment.

[0005] Power tools offer advantages such as being environmentally friendly and clean, and they also produce relatively less noise compared to fuel-powered tools. Therefore, power tools are increasingly favored by power tool users. However, a major drawback of power tools is the relatively short battery life provided by their battery packs. This problem is particularly pronounced outdoors or in situations without access to AC outlets.

[0006] Therefore, in the field of power tools, especially in the commercial power tool sector where rated power requirements are high, fuel-powered tools remain the first choice for power tool users despite their obvious drawbacks. Summary of the Invention

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

[0008] In a first aspect, a power supply system is provided, comprising: a battery pack system including multiple battery packs for alternately powering an electric tool system, wherein the electric tool system includes multiple garden-type electric tools; a portable energy storage charging system, the charging system comprising: an input interface for receiving input power, wherein the input power is DC power or AC power; a power storage unit including one or more battery packs for charging the one or more battery packs using the DC power or AC power to store electrical energy; and a first power conversion unit electrically connected to the power storage unit for converting the electrical energy stored in the power storage unit into... The system is configured to: switch to a first charging power; have an output interface electrically connected to the first power conversion unit for outputting the first charging power; and have multiple charging compartments electrically connected to the output interface, wherein the charging compartments are used to hold the battery pack and charge the battery pack using the first charging power output from the output interface; wherein the multiple charging compartments are configured to charge idle battery packs in the battery pack system during the operation of the power tool system, such that at least one of the multiple battery packs is fully charged before one of the battery packs completely discharges from the power tool system.

[0009] Secondly, a power supply system is provided. The power supply system includes: a battery pack system comprising multiple battery packs for alternately supplying power to an electric tool system, wherein the electric tool system includes one or more electric tools; and a charging system for charging idle battery packs within the battery pack system during operation of the electric tool system, wherein the charging speed of the charging system on the battery pack system is not less than the discharging speed of the battery pack system on the electric tool system.

[0010] Thirdly, a power supply system is provided, comprising: an electric tool system including multiple high-power electric tools, wherein the high-power electric tools are electric tools with a rated power greater than or equal to 1KW and less than or equal to 3KW; a battery pack system, wherein the number of battery packs in the battery pack system is not less than twice the number of battery packs required when the electric tool system is working; and a portable charging system for charging the battery packs in the battery pack system that are in an idle state during the operation of the electric tool system, wherein the charging speed of the charging system for the battery packs is not less than the maximum discharge speed of the battery packs for the electric tool system.

[0011] Fourthly, a power supply system is provided, comprising: an electric tool system including multiple garden electric tools; a battery pack system including two sets 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 sets of battery packs, wherein the charging speed of the charging system for the set of battery packs is not less than the maximum discharge speed of the set of battery packs for the electric tool system.

[0012] Fifthly, a working system is provided, comprising: an electric tool system; and a power supply system as described in any one of the first to third aspects.

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

[0014] A seventh aspect provides a working method, comprising: during the operation of the power tool system, using multiple battery packs in a battery pack system to alternately supply power to the power tool system; using a charging system to charge the idle battery packs in the battery pack system, wherein 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 power tool system.

[0015] Eighthly, a method of operation is provided, 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.

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

[0017] The first aspect of this application provides a power supply system, comprising: a battery pack system including multiple battery packs for alternately powering an electric tool system, wherein the electric tool system includes multiple garden electric tools; and a portable energy storage charging system, the charging system comprising: a power storage unit including one or more battery cells for storing electrical energy; an input interface connected to the one or more battery cells for receiving input power to charge the battery cells, wherein the input power is DC power or AC power; and a first power conversion unit electrically connected to the power storage unit for converting the electrical energy stored in the power storage unit into power to output a first charging power. The output interface is electrically connected to the first power conversion unit and is used to output electrical energy at the first charging power. Multiple charging compartments are electrically connected to the output interface. Each charging compartment is used to hold the battery pack and to charge the battery pack using the electrical energy output from the output interface. The average charging power of a single charging compartment to a single battery pack is not less than the average discharging power of a single battery pack to the power tool. The average charging power is the charging power required to charge the battery pack from a fully charged state to a fully charged state within an effective charging time. The average discharging power is the discharging power required to discharge the battery pack from a fully charged state to a fully charged state within an effective discharging time.

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

[0019] In one embodiment, the average charging power required for the battery pack to charge from an empty state to a fully charged state during a continuous charging time is not less than the average discharging power required for the battery pack to discharge from a fully charged state to an empty state during a continuous discharging time.

[0020] In one embodiment, the continuous charging time required for the battery pack to charge from a depleted state to a fully charged state is no greater than the continuous discharging time required for the battery pack to discharge from a fully charged state to a depleted state.

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

[0022] In one embodiment, the internal resistance of the individual 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 case for the battery pack is configured such that the charging time of the battery pack is not more than 20 minutes.

[0023] Preferably, the internal resistance of the individual 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 4C, and the charging power of the charging compartment for 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 individual 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 5C, and the charging power of the charging compartment for the battery pack is configured such that the charging time of the battery pack is not greater than 12 minutes.

[0025] In one embodiment, the amount of electricity carried by a single battery pack is no more than one-eighth of the amount of electricity that the energy storage unit can hold.

[0026] In one embodiment, the energy storage unit can hold no less than 5 kWh of energy.

[0027] In one embodiment, the battery pack has a capacity of not less than 500Wh.

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

[0029] In one embodiment, the charging rate and discharging rate of the individual cells in the energy storage unit are lower than the charging rate and discharging rate of the individual cells in the battery pack, respectively.

[0030] In one embodiment, the charging rate and discharging rate of each individual cell in the energy storage unit are not greater than 1.5C.

[0031] In one embodiment, the maximum number of charge-discharge cycles of the battery pack is not less than 3,000; preferably, the maximum number of charge-discharge cycles of the battery pack is not less than 5,000.

[0032] In one embodiment, the charging compartment and / or the battery pack further includes a heating device and / or a heat dissipation device for temperature control of the battery pack, enabling the battery pack to be continuously charged and discharged.

[0033] In one embodiment, multiple charging compartments are configured to charge idle battery packs in the battery pack system during operation of the power tool system, such that at least one of the multiple battery packs is fully charged before one of the battery packs has completely discharged from the power tool system.

[0034] In one embodiment, the first power conversion unit is further configured to convert the electrical energy stored in the electrical energy storage unit into AC power; the output interface includes a first AC output interface for outputting the AC power to the outside.

[0035] In one embodiment, the charging system further includes a second power conversion unit electrically connected to the input interface, for converting the input power into a second charging power to charge the energy storage unit.

[0036] In one embodiment, the input interface is used to receive the input power from one or more of the following devices: AC power outlet, DC charging pile, AC charging pile, mobile power vehicle, and energy storage cabinet.

[0037] In one embodiment, the configuration of the power storage unit enables the DC charging pile and / or the AC charging pile to charge the power storage unit from an empty state to a fully charged state within one hour.

[0038] In one embodiment, a direct charging channel is provided between the input interface and the power storage unit, the direct charging channel being used to directly charge the power storage unit using the DC power when the input power is DC power.

[0039] In one embodiment, the charging system further includes: a second AC output interface for outputting AC power when the input power is AC power.

[0040] In one embodiment, the second AC output interface is used to charge the battery pack via a charger and / or a power adapter.

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

[0042] In one embodiment, the maximum charging power of the charging system is greater than the power limit of the mains socket.

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

[0044] In one embodiment, the rated power of the power tool is greater than or equal to 1KW and less than or equal to 3KW.

[0045] In one embodiment, the number of battery packs in the battery pack system is equal to twice the number of battery packs required for the power tool system to operate.

[0046] A second aspect of this application provides a power supply system, comprising: a battery pack system including multiple battery packs for alternately powering an electric tool system, wherein the electric tool system includes multiple garden electric tools; a portable energy storage charging system, the charging system comprising: a power storage unit including one or more battery cells for storing power; an input interface connected to the one or more battery cells, the input interface being used to receive input power for charging the battery cells, the input power being DC power or AC power; a first power conversion unit electrically connected to the power storage unit for converting the power stored in the power storage unit into power to output a first charging power; and an output interface. The first power conversion unit is electrically connected to the first charging power unit and is used to output electrical energy at the first charging power. Multiple charging compartments are electrically connected to the output interface. Each charging compartment is used to hold the battery pack and to charge the battery pack using the electrical energy output from the output interface. The ratio of the average charging power of a single charging compartment to the average discharging power of a single battery pack to the power tool is between 0.5 and 2. The average charging power is the charging power required to charge the battery pack from an empty state to a fully charged state within an effective charging time. The average discharging power is the discharging power required to discharge the battery pack from a fully charged state to an empty state within an effective discharging time.

[0047] A third aspect of this application provides a charging system comprising: a power storage unit including one or more battery cells for storing power; an input interface connected to the one or more battery cells for receiving input power to charge the battery cells, the input power being DC power or AC power; a first power conversion unit electrically connected to the power storage unit for converting the power stored in the power storage unit into power to output a first charging power; an output interface electrically connected to the first power conversion unit for outputting electrical energy at the first charging power; and at least one charging compartment electrically connected to the output interface for placing the battery pack and charging the battery pack using the electrical energy output from the output interface; wherein the average charging power of the charging compartment for the battery pack is not less than 2.4 kW.

[0048] In one embodiment, the charging compartment provides an average charging power of not less than 3 kW for a single battery pack.

[0049] A fourth aspect of this application provides a working system, including: 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 This is a schematic diagram of the structure of a charging system provided in another embodiment of this application.

[0063] Figure 12 This is a schematic diagram of the structure of a charging system provided in another embodiment of this application.

[0064] Figure 13 yes Figure 1 Another example diagram of the working system in the diagram. Detailed Implementation

[0065] Based on their power source, power tools can be divided into electric tools and fuel-powered tools. The advantage of fuel-powered tools is their ability to operate continuously at high power for extended periods. However, their disadvantages include environmental pollution and significant noise pollution. Therefore, people have been searching for alternatives to fuel-powered tools.

[0066] Electricity is an environmentally friendly and clean energy source. Therefore, power tools are becoming increasingly popular. However, a major problem with current power tools, especially high-power tools with a rated power (or operating power) of 1KW or higher, is insufficient power supply, making it impossible to support continuous operation for extended periods. For example, for power tools with a rated power of 1KW to 3KW, current battery packs can only support continuous operation for a few minutes at most. Once the battery pack is depleted, recharging it often takes several hours. This problem is commonly referred to as the "power tool anxiety" problem.

[0067] The following example, using garden tools, will provide a more detailed illustration of this issue.

[0068] Garden tools generally refer to equipment used for the maintenance of garden landscapes. These tools typically work on lawns, hedges, flowers, trees, or other garden structures. There are many types of garden tools, which may include one or more of the following: lawn mowers, lawn trimmers, hedge trimmers, chainsaws, blowers, leaf miners, snowplows, etc.

[0069] Garden tools can be divided into two types: household and commercial. Commercial garden tools are professional power tools designed for gardeners or gardening companies. Compared to household garden tools, commercial garden tools have higher requirements for work efficiency; therefore, the rated power (or maximum working power) of commercial garden tools is usually also higher.

[0070] For commercial gardening tools, a common use case is a team of 2-3 workers who work a day to mow the gardens of 10-20 families. Mowing is typically the most time-consuming part of gardening, and while lawn sizes vary, it averages 20-40 minutes. Therefore, upon arriving at a garden, worker A immediately begins mowing. While worker A mows, worker B performs other tasks, such as trimming, pruning, and blow-drying. Workers A and B complete their tasks roughly simultaneously. Thus, a team's work time at one garden is approximately 20-40 minutes (roughly equivalent to the time spent mowing). Once one garden is finished, the team moves on to another and repeats the process until all tasks for the day are completed.

[0071] Garden maintenance work inherently possesses green and environmentally friendly attributes, making power tools the ideal choice for gardeners and landscaping companies. However, as described above, commercial gardening tools require very high efficiency, and users typically expect their power sources to support uninterrupted work throughout the day. These requirements are difficult for current power tools to meet. Furthermore, considering that gardening work is usually done outdoors, where there are often no AC outlets, even when using power tools, it's impossible to recharge them promptly. For these reasons, current commercial gardening tools are primarily fuel-powered. While a small number of commercial gardening tools utilize power tools, these are generally used only as auxiliary tools.

[0072] The above example uses a gardening work scenario. In reality, many other work scenarios place high demands on the working time or efficiency of power tools. These include scenarios where cleaning tools are used to provide cleaning services to homes or companies, or where machining or assembly power tools are used for parts processing or equipment assembly. The main challenge in widely adopting power tools in these scenarios is how to increase their working time.

[0073] One possible solution to increase the working time of power tools is to equip them with high-capacity battery packs. However, despite the significant research and efforts made by battery pack developers in terms of capacity and performance, the performance of current high-capacity battery packs remains unsatisfactory, still failing to achieve a satisfactory level of working time for power tools.

[0074] The current large-capacity battery packs mainly have the following problems.

[0075] Firstly, in the power tool industry, the capacity of individual cells in large-capacity battery packs on the market is generally small (usually less than 5AH). To increase the capacity of the battery pack, manufacturers typically increase the number of individual cells. For example, common large-capacity battery packs on the market generally contain more than 30 individual cells. However, the weight of the battery pack generally needs to be maintained within a reasonable range, so the increase in the number of individual cells is limited. In other words, increasing the number of individual cells to improve the battery pack capacity is also limited. For example, currently mainstream large-capacity, multi-cell battery packs on the market can generally store no more than 300Wh of electricity, which is still far from sufficient for power tools, especially high-power power tools. As an example, for a power tool with a rated power of 3kW, 300Wh of electricity may be consumed in a few minutes, at most a dozen minutes.

[0076] Secondly, in the power tool industry, the charge / discharge rate performance of individual cells in large-capacity battery packs is generally low, and the number of charge / discharge cycles is generally short. For example, the charging rate of individual cells in commercially available large-capacity battery packs is typically around 0.3C, and the discharging rate is generally around 1C. The low charging rate leads to a longer charging time for the battery pack, while the low discharging rate limits the discharge power of the battery pack, resulting in low working efficiency of high-power power tools.

[0077] Thirdly, the maximum charge-discharge cycle life (or cycle life) of individual cells in large-capacity battery packs on the market is generally less than 1,000 times. The low number of charge-discharge cycles will result in a shorter battery pack life and the need for frequent replacement, which undoubtedly increases the cost of using power tools.

[0078] Fourthly, traditional high-capacity battery packs charge slowly. This slow charging speed is due to two main factors: firstly, the performance of individual battery cells is limited (e.g., the charging rate), and secondly, the charging power provided by the charging devices is relatively low. Currently, most charging devices on the market draw power from AC outlets. However, for safety reasons, the power output of AC outlets is usually limited. For example, in North America, AC outlets are generally limited to 1.8 kW, and in Europe, they are generally limited to 3.6 kW. Because of these power limitations, commercially available charging devices cannot provide high-power charging for battery packs. Once a high-capacity battery pack is depleted, it typically requires a long charging time (far exceeding the battery pack's maximum operating time).

[0079] Fifthly, if users need to work outdoors or in places without mains power outlets for extended periods, once the battery pack runs out, work will be forced to stop because it cannot be recharged in time. Of course, to ensure a longer power supply for the power tools, users can purchase many spare battery packs. However, a large number of battery packs are inconvenient to carry and impose a significant cost burden. Considering these two points, it is clear that this solution is not actually feasible.

[0080] In summary, traditional large-capacity battery packs, due to their low discharge power, slow charging speed, short lifespan, and inconvenient charging, prevent power tools from being widely used in scenarios requiring high rated power and long operating time. Precisely because of these reasons, in many power tool sectors, especially commercial power tools, despite their obvious shortcomings, fuel-powered tools remain the preferred choice for users, while power tools are typically used primarily as auxiliary tools.

[0081] It is widely believed that the anxiety about the use of power tools is an inherent drawback compared to fuel-powered tools, and unless there is a significant advancement in battery pack technology, this problem cannot be solved in the short term.

[0082] This application provides a different problem-solving approach. This approach, through the rational design of a working system and method, enables power tools to operate continuously for a relatively long period (e.g., one day), during which the user does not need to worry about insufficient power supply. This problem-solving approach facilitates the complete transformation of fuel-powered tools to power tools. The working system and method are described in detail below with reference to different embodiments.

[0083] Example 1: Working System

[0084] like Figure 1 As shown, the working system 1 provided in Embodiment 1 may include a power tool system 2, a battery pack system 3, and a charging system 4.

[0085] The power tool system 2 may include one or more power tools ( Figure 1 The diagram shows N power tools (where N is a positive integer not less than 1). For example, if the power tool system needs to perform a single task that can be completed by one type of power tool, then only one power tool needs to be configured for the user of work system 1. Conversely, if power tool system 2 needs to perform diverse tasks requiring the cooperation of multiple power tools, then multiple power tools can be configured for the user of work system 1.

[0086] Taking garden maintenance work as an example, as mentioned earlier, garden maintenance work usually includes tasks such as mowing, pruning, cutting grass, and blowing grass. Figure 2 An example of a power tool system 2 that can be configured for the user of work system 1 for garden maintenance work is shown. The power tool system 2 may include four power tools: a lawnmower 21, a pruning machine 22, a lawn trimmer 23, and a blower 24 (or a grass blower).

[0087] See again Figure 1 The types of power tools in power tool system 2 can be determined according to the work content of power tool system 2. Taking garden maintenance work as an example, the power tools in power tool system 2 can be garden-type power tools (sometimes also called garden power tools or electric garden tools). Garden-type power tools may include one or more of the following power tools: lawn mower, lawn trimmer, hedge trimmer, chainsaw, blower, leaf shredder, snowplow, etc.

[0088] Taking cleaning work in a home or office area as an example, the power tools in power tool system 2 can be several power cleaning tools. These power cleaning tools may include, for example, a vacuum cleaner, a floor scrubber, etc. Alternatively, taking machining or parts assembly work as an example, power tool system 2 may include power tools for machining or assembly, such as electric hammers and electric drills.

[0089] The power tools in power tool system 2 can be power tools with high rated power requirements. In this application embodiment, such power tools are referred to as high-power power tools. In conventional technology, high-power power tools are characterized by a longer recharging time required after their battery pack is depleted, but a shorter discharge time (or runtime) that the battery pack can provide to the power tool. In some embodiments, a high-power power tool can refer to a power tool with a rated power (or maximum operating power) greater than 1 kW. For example, a high-power power tool can refer to a power tool with a rated power between 1 kW and 3 kW.

[0090] See also Figure 1 To meet the power supply requirements of the power tool system 2, a battery pack system 3 is configured in the working system 1. The battery pack system 3 may include multiple battery packs ( Figure 1 M battery packs are shown (where M is a positive integer greater than 1). These multiple battery packs can be used to alternately power the power tool system 2.

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

[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] This application does not specifically limit the grouping method of multiple battery packs in its embodiments. As an example, multiple battery packs can be pre-divided into multiple groups, and during actual use, they can be alternately used to power the power tool system 2 according to the pre-divided groups. As another example, multiple battery packs may not be pre-grouped. For example, when the power tool system 2 needs to be used, the user can select some battery packs from the multiple battery packs to power the power tool system 2. At this time, the selected battery packs naturally form one group of battery packs. After the group of battery packs has discharged, the user of the power tool system 2 can select some battery packs from the remaining battery packs to power the power tool system 2. The battery packs selected by the user of the power tool system 2 again naturally form another group of battery packs. Of course, if the number of multiple battery packs is twice the number of battery packs required for the power tool system 2 to work, then when the user first randomly selects some battery packs from the multiple battery packs to power the power tool system 2, the multiple battery packs are naturally divided into two groups of battery packs.

[0096] Alternating (or rotating) power supply from multiple battery packs to the power tool system 2 refers to selecting one set of battery packs from the remaining charged battery packs after one set of battery packs has discharged completely to continue supplying power to the power tool system 2. Multiple battery packs can alternately supply power to the power tool system 2 in a specific order. For example, assuming multiple battery packs are divided into K groups, the alternating power supply from multiple battery packs to the power tool system 2 can be achieved as follows: Battery packs from group 1 to group K are used sequentially to supply power; after group K has finished supplying power, battery packs from group 1 to group K are used again sequentially to supply power.

[0097] It should be noted that, during the process of multiple battery packs alternately supplying power to the power tool system 2, this embodiment does not require one battery pack to be simultaneously replaced by another. In other words, the battery packs in the same group can be replaced at the same time or at different times, as long as the replacement of one battery pack by another is ultimately achieved.

[0098] For example, battery pack system 3 includes a first battery pack and a second battery pack. The first battery pack includes battery pack A and battery pack B, and the second battery pack includes battery pack C and battery pack D. Assume that power tool system 2 initially uses the first battery pack for power. However, due to differences in the discharge speeds of different power tools in power tool system 2, battery pack A discharges faster than battery pack B. After battery pack A has completely discharged, battery pack C from the second battery pack can replace battery pack A. Then, after battery pack B has completely discharged, battery pack D from the second battery pack can replace battery pack B. Through this battery pack replacement process, it can be seen that battery pack C and battery pack D do not simultaneously replace battery packs A and B. However, overall, it can still be understood that the second battery pack replaces the first battery pack, continuing to supply power to power tool system 2.

[0099] After the battery pack in battery pack system 3 finishes discharging, if it cannot be recharged in time, it will be unable to alternately supply power to power tool system 2. Therefore, please refer to [the relevant documentation]. Figure 1 To meet the power replenishment needs of the battery pack system 3, the working system 1 is also equipped with a charging system 4 (or charging device). The battery pack system 3 and the charging system 4 can be collectively referred to as the power supply system or power replenishment system of the power tool system 2.

[0100] The charging system 4 can be a generator or an energy storage charging system. The generator can be, for example, a solar-powered generator or a mechanical-powered generator. The energy storage charging system can store a certain amount of electricity internally and then use that electricity to charge external devices. Embodiment 3 below will provide a detailed example illustrating the structure of the energy storage charging system, while Embodiment 1 mainly introduces it from a functional perspective.

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

[0102] It should be noted that in some cases, some battery packs in the idle state may have sufficient charge and do not need to be charged. For example, when the power tool system 2 initially starts working, multiple battery packs may all be fully charged, and even if there are idle battery packs, they do not need to be charged. Therefore, this embodiment does not require the charging system 4 to charge all idle battery packs. If all idle battery packs are low on charge, the charging system 4 can charge all idle battery packs; if the idle battery packs include both low-charge and fully charged battery packs, the charging system 4 can charge only the low-charge battery packs.

[0103] As mentioned earlier, this application aims to enable the power tool system 2 to operate continuously for a relatively long period of time (such as a day). To achieve this, during the operation of the power tool system 2, the charging capacity of the charging system 4 to the battery pack system 3 must be no less than the discharging capacity of the battery pack system 3 to the power tool system 2. Alternatively, during the operation of the power tool system 2, the charging speed (or average charging speed) of the charging system 4 to the battery pack system 3 must be no 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 electricity input from the charging system 4 to the battery pack system 3 is not less than the amount of electricity output from the battery pack system 3 to the power tool system 2. This ensures that the battery pack system 3, as a whole, will not experience a power shortage due to the power consumption of the battery pack by the power tool system 2. In other words, during the operation of the power tool system 2, the charging of the battery pack system 3 by the charging system 4 ensures that the battery pack system 3, as a whole, is always in a charged state (or in a state capable of supplying power to the power tool system 2). For example, the charging of the battery pack system 3 by the charging system 4 ensures that at least one battery pack in the battery pack system 3 is always in a charged state during the operation of the power tool system 2.

[0105] It should be 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 rather charges the idle battery packs within the battery pack system 3. Therefore, the "charging capacity or charging speed of the charging system 4 for the battery pack system 3" mentioned earlier can be indirectly measured by the charging speed of the charging system 4 for the idle battery packs. For example, the faster the charging system 4 charges a single battery pack, and / or the more battery packs the charging system can charge simultaneously, the faster the charging system 4 charges the battery pack system 3.

[0106] Similarly, during the operation of the power tool system 2, the battery pack system 3 does not discharge to the power tool system 2 as a whole, but rather selects a group of battery packs from the battery pack system 3 to discharge to 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 earlier can be indirectly measured by the discharge speed of these selected battery packs used to discharge to the power tool system 2. For example, the more battery packs required for the power tool system 2 to operate, and / or the faster the discharge speed of a single battery pack during use, the faster the battery pack system 3 discharges to the power tool system 2.

[0107] It should also be noted that this application embodiment does not require that the charging speed of the charging system 4 to the battery pack system 3 be no less than the discharging speed of the battery pack system 3 to the power tool system 2 at all times. For example, in the initial stage of using the power tool system 2, all battery packs in the battery pack system 3 may be fully charged. In this case, this application embodiment does not require that the charging speed of the charging system 4 to the battery pack system 3 be no less than the discharging speed of the battery pack system 3 to the power tool system 2. Therefore, the requirement that the charging speed of the charging system 4 to the battery pack system 3 be no less than the discharging speed of the battery pack system 3 to the power tool system 2 mentioned in this application embodiment is from the perspective of the entire working process of the power tool system 2. For example, the average charging speed of the charging system 4 to the battery pack system 3 is no less than the average discharging speed of the battery pack system 3 to the power tool system 2, so as to ensure that the power of the battery pack system 3 does not drop to a level that cannot meet the power supply requirements of the power tool system 2.

[0108] There are several ways to ensure that 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. For example, one possible implementation is to configure the charging power of the charging system 4 so that the charging speed of the charging system 4 to any battery pack is not less than the discharging speed of that battery pack to the power tools in the power tool system 2. The discharging speed of the battery pack to the power tools can be the average discharging speed of the battery pack to the power tools, or it can be the maximum discharging speed of the battery pack to the power tools (the discharging speed of the battery pack at the maximum operating power of the power tools). In other words, the charging speed of the charging system 4 to the battery pack and the discharging speed of the battery pack to the power tools can be configured so that the full charging time of the battery pack is not less than the depletion time of the battery pack.

[0109] For example, battery pack system 3 includes two battery packs. During the initial operating phase of power tool system 2, both battery packs are fully charged. At this time, the first battery pack can be used to power power tool system 2. After the first battery pack has discharged completely, the second battery pack can replace the first battery pack, and charging system 4 can be used to charge the first battery pack when it is low on power. In this example, the charging speed of charging system 4 can be configured so that the charging speed of charging system 4 for any battery pack is not less than the discharging speed of that battery pack for the power tool. In this way, after the second battery pack has discharged completely, the first battery pack is fully charged and can continue to power power tool system 2.

[0110] Of course, the above-mentioned implementation method is just an example. This application embodiment does not require that the charging speed of the charging system 4 for a single battery pack must be greater than the discharging speed of that single 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 that battery pack for the power tool, as long as the number of battery packs and the number of charging interfaces or charging channels of the charging system 4 are reasonably set, uninterrupted power supply to the power tool system 2 can still be achieved.

[0111] Taking battery pack system 3, which includes three battery packs, as an example, assuming that all three battery packs are fully charged during the initial working phase of the power tool system 2, the first battery pack can be used to power the power tool system 2. After the first battery pack has discharged completely, the second battery pack can be used to replace the first battery pack to continue powering the power tool system 2, while the charging system 4 charges the first battery pack when it is low on power. After the second battery pack has discharged completely, the third battery pack can be used to replace the second battery pack to continue powering the power tool system 2, while the charging system 4 charges the second battery pack when it is low on power. In this example, it is not required that the charging system 4 has already fully charged the first battery pack when it starts charging the second battery pack. In fact, the charging system 4 can charge the first and second battery packs simultaneously, as long as the charging system 4 can fully charge the first battery pack when the third battery pack has discharged completely. Therefore, if the power tool system 2 is equipped with three battery packs and the charging system 4 can support the simultaneous charging of two battery packs, even if the charging speed of the charging system 4 for a single battery pack is set to half the discharge speed of that battery pack for the power tool, the power tool system 2 can still be continuously powered.

[0112] For ease of understanding, the following text will combine... Figures 2 to 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 3(Charging system 4 is not shown; it can be installed on the vehicle), and then drive to the second garden. In the second garden, multiple gardening power tools can be used to maintain it. The maintenance of the second garden can be similar to that of the first garden, and will not be described in detail here. The difference is that during the maintenance of the second garden, the power tool system 2 is powered by the second battery pack 33, 34.

[0118] After the first garden is finished but before the second garden is finished, the charging system 4 can be used to charge the first battery pack, ensuring it is fully charged before the second garden is completed. This allows the first battery pack to be reused for subsequent garden maintenance. Of course, this embodiment does not specify a particular start time for charging the first battery pack; it can be charged while the vehicle is in motion. Alternatively, charging can begin when the second garden is started.

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

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

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

[0122] When the number of battery packs in battery pack system 3 is twice the number of battery packs required for power tool system 2 to operate, assuming the time required for a single battery pack to charge from empty to fully charged is t1, the time required for a single battery pack to discharge from fully charged to empty is t2, and the travel time from one garden to another is t3, then the charging speed and discharging speed of charging system 4 for 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 one-hour drive, t3 can be set to 1 hour.

[0123] When the number of battery packs in battery pack system 3 is N times the number of battery packs required for power tool system 2 to operate (N > 2), assuming the time required for a single battery pack to charge from empty to fully charged is t1, the time required for a single battery pack to discharge from fully charged to empty is t2, and the time required to travel from one garden to another is t3, then the charging speed and discharging speed of charging system 4 for 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 one-hour drive, t3 can be set to 1 hour.

[0124] The preceding text, in conjunction with Embodiment 1, has provided an overall description of the working system and method provided in this application. As can be seen from the description of Embodiment 1, using the working system 1 requires configuring a suitable battery pack. One possible battery pack configuration is to select a commercially available high-capacity battery pack. However, as mentioned earlier, commercially available high-capacity battery packs have many shortcomings in terms of capacity, charge / discharge rate, and lifespan. While using such a battery pack might achieve uninterrupted power supply to the power tool system, it could lead to lower overall system efficiency and higher costs.

[0125] The battery pack provided in this application will be described in detail below with reference to Embodiment 2. It should be understood that Embodiment 2 and Embodiment 1 can be combined with each other. In other words, the battery pack mentioned in Embodiment 2 can be applied to any of the working systems or methods described in Embodiment 1.

[0126] Example 2: Battery Pack

[0127] As mentioned earlier, traditional high-capacity battery packs typically have a capacity of no more than 300Wh. However, 300Wh is relatively low, and the power will be quickly depleted by power tools, increasing the frequency of battery pack replacement. Frequent battery pack replacement wastes working time and affects work efficiency, and also leads to a shorter battery pack lifespan. To alleviate this problem, embodiments of this application provide battery packs with a capacity of not less than 500Wh (e.g., 600Wh).

[0128] Taking garden maintenance as an example, the maintenance time for one garden is generally 20-40 minutes. A battery pack with a capacity of at least 500Wh can basically ensure that the battery pack does not need to be replaced during the maintenance of one garden. In this way, the user can change the battery pack while traveling to another garden, so that the battery pack replacement will not affect work efficiency.

[0129] As mentioned earlier, traditional high-capacity battery packs typically contain more than 30 individual cells, which leads to excessive weight. This application's embodiment designs the number of cells in the battery pack to no more than 15, and the capacity of each individual cell is no less than 10AH, thus ensuring the battery pack's capacity while preventing excessive weight.

[0130] As an example, the battery pack capacity can be designed to be greater than 500Wh, and the number of cells in the battery pack can be controlled to within 15. This can avoid the battery pack being too heavy and, to some extent, avoid the need for frequent battery pack replacements due to insufficient capacity. Therefore, this design approach achieves a balance between weight and efficiency.

[0131] The rated voltage (or voltage plateau) of the battery pack can be designed based on the operating voltage (or voltage plateau) of the power tool. The rated voltage of the battery pack generally needs to match the operating voltage of the power tool. In some embodiments, the rated voltage of the battery pack can be designed to be relatively high, for example, not less than 40V. As a specific example, the rated voltage of the battery pack can be designed to be 60V. With a fixed discharge rate, designing a higher rated voltage for the battery pack can increase the discharge power of the battery pack, thereby enabling the power tool to operate at higher power.

[0132] The discharge power of the battery pack can be determined based on the requirements of the power tool. In some embodiments, the discharge power of the battery pack can be set to be no less than the maximum operating power of the power tool. As an example, the discharge power of the battery pack can be set to 3 kW.

[0133] As mentioned earlier, the charging rate of individual cells in large-capacity battery packs on the market is typically around 0.3C, and the discharging rate is generally around 1C. Such charging and discharging rates result in relatively slow charging and discharging speeds for the battery pack, thus affecting its operating efficiency.

[0134] This application designes the maximum continuous charging rate and / or maximum continuous discharging rate of individual cells within the battery pack to be no less than 3C, significantly improving the charging / discharging speed of the battery pack. The maximum continuous charging rate refers to the maximum charging rate that the battery pack can maintain throughout the continuous charging process from a fully charged state to a fully charged state. The maximum continuous discharging rate refers to the maximum discharging rate that the battery pack can maintain throughout the continuous discharging process from a fully charged state to a fully charged state. In other words, the battery pack can consistently charge at a rate of no less than 3C during continuous charging and discharge at a rate of no less than 3C during continuous discharging. In this application, the state of depletion of the battery pack refers to a state where the SOC (state of charge) is below 5% of the battery pack's rated capacity, and the state of full charge refers to a state where the SOC is above 95% of the battery pack's rated capacity.

[0135] Specifically, since a lower internal resistance in a single battery cell results in a higher charge / discharge rate, individual cells with low internal resistance can be customized to improve their charging and / or discharging rates. Furthermore, low-resistance cells reduce the temperature rise of the battery pack during charging and discharging. As an example, the rated voltage of the battery pack can be designed to be no less than 40V, while the maximum continuous charge rate and maximum continuous discharge rate can both be designed to be no less than 4C. As another example, the maximum continuous charge rate and maximum continuous discharge rate can both be configured to be no less than 5C. This design ensures that the battery pack can support high-power charging and high-power discharging. Therefore, with this design, the battery pack can charge and discharge quickly during operation, allowing the entire system to operate continuously with high efficiency.

[0136] Furthermore, the internal resistance configuration of the individual cells in the battery pack ensures that the maximum continuous charging rate of the battery pack is not less than the maximum continuous discharging rate, thus ensuring that the charging speed of the battery pack is not less than its discharging speed. In other words, in this application, the maximum continuous charging rate of the battery pack is not less than the maximum continuous discharging rate, and both the maximum continuous charging rate and the maximum continuous discharging rate are not less than 3C, making the charging and discharging capabilities of the battery pack significantly greater than those of commonly available battery packs on the market.

[0137] As mentioned earlier, the maximum charge-discharge cycle life of commercially available high-capacity battery packs is generally below 1000 cycles, with common high-capacity battery packs having a maximum charge-discharge cycle life of 300-500 cycles. A low charge-discharge cycle life results in a shorter battery pack lifespan, requiring frequent replacements, which undoubtedly increases the operating cost of the system. Taking garden maintenance work as an example, gardeners typically need to maintain 10-20 gardens per day. Assuming the gardener has two sets of replaceable battery packs and replaces the battery pack after each garden maintenance, each battery pack needs to be charged and discharged approximately 8 times per day. If a high-capacity battery pack with a maximum charge-discharge cycle life of 300-500 is used, a new battery pack will need to be purchased after a few months at most, which obviously leads to higher operating system costs.

[0138] To address the aforementioned issues, this application embodiment designs the maximum charge-discharge cycle life of a single cell in the battery pack to be no less than 3000 cycles, preferably no less than 5000 cycles, to ensure the battery pack's lifespan. Even if a battery pack needs to complete 8-10 charge-discharge cycles per day, 5000 charge-discharge cycles can still extend the battery pack's lifespan to two years, thereby reducing the overall operating system cost.

[0139] In addition, the maximum charge-discharge cycle count of a single cell in the battery pack is designed to be no less than 5,000 times. This design is particularly important for work scenarios that require a high number of charge-discharge cycles per day (such as landscapers who tend to 10-20 gardens a day). Such requirements are not usually present in ordinary work scenarios.

[0140] As mentioned in Embodiment 1, this application aims to enable power tool systems to operate continuously. To achieve this capability, this embodiment requires multiple battery packs to be charged and discharged alternately. During this alternating charging and discharging process, without temperature control (or management) of the battery packs, two problems may arise. First, in low-temperature working environments (such as outdoors), the battery packs may become too cold, preventing them from immediately initiating charging or discharging. Second, the temperature of the battery packs may rise during charging and discharging. If the battery pack temperature becomes too high, exceeding a preset temperature threshold, the charging system may need to wait for the battery pack temperature to drop before charging, causing an interruption in the charging process. If either of these problems occurs, the power tool system may be unable to operate continuously for a period of time, thereby reducing the performance of the operating system.

[0141] To address this issue, in some embodiments, a heating device and / or a cooling device can be configured for the battery pack. The heating device prevents the battery pack from becoming too cold, allowing it to begin charging or discharging immediately even in cold weather. The cooling device can mitigate overheating issues to some extent. Therefore, configuring a heating device and / or a cooling device for the battery pack can improve the uninterrupted operation performance of the power tool system to a certain degree.

[0142] Some power tools (such as handheld power tools) do not have a built-in battery pack mounting section. Power for these tools is achieved using a back frame (or carrying device), where the user carries the battery pack on their back to power the tool. Traditionally, the back frame and battery pack are integrated, which limits the use of the battery pack.

[0143] This application embodiment adopts a separate design for the battery pack and the back frame, that is, the back frame (which may also be part of the working system mentioned above) is detachably connected to the battery pack. Figure 5 For example, the battery pack 31 can be separated from or assembled with the back frame 5. When the battery pack 31 is needed for a handheld power tool (such as...), Figure 4 When powering a pruning machine 22, lawnmower 23, blower 24, etc., the battery pack 31 can be installed on the back frame 5, and then electrically connected to the handheld power tool through the interface 51 on the back frame 5. When the battery pack is needed for a non-handheld power tool, the battery pack is installed in the battery pack mounting part of the power tool to power it. Figure 4 and Figure 6 For example, you can first follow Figure 6 Install the battery pack onto the lawnmower as shown, and then the worker can proceed as follows: Figure 4 As shown, push the lawnmower to perform the mowing work.

[0144] The advantage of adopting a separate battery pack and back frame design is that the battery pack can be installed on the power tool for operation, or it can power the power tool through the back frame, thus making the use of the battery pack more flexible.

[0145] The preceding text, in conjunction with Embodiment 1, mainly described the charging system 4 provided in this application from a functional perspective. Below, in conjunction with Embodiment 3, taking the energy storage charging system 4 as an example, a more detailed explanation of the structure of the charging system 4 will be provided. It should be understood that Embodiment 3 can be combined with Embodiments 1 and 2. In other words, the charging system 4 mentioned in Embodiment 3 can be applied to any working system or method described in Embodiment 1, and can also be used in conjunction with any type of battery pack described in Embodiment 2.

[0146] Example 3: 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 to 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 energy storage unit 41 may include individual battery cells. The charging and discharging rates of these individual cells can be determined according to the charging and discharging speed requirements of the charging system 4. Compared to the battery pack, the energy storage unit 41 has relatively lower requirements for the real-time performance of charging and discharging. Therefore, in some embodiments, the charging and discharging rates of the individual battery cells in the energy storage unit 41 can be set lower, thereby reducing the cost of the battery cells.

[0157] As mentioned in Example 2, in order to support the operation of power tools at high power, the battery pack cells are preferably cells with low internal resistance to meet the requirements of higher charge and discharge rates. Therefore, by setting the charge and discharge rate of the individual cells in the energy storage unit 41 to a lower level, such as setting it to be lower than the charge and discharge rate of the individual cells in the battery pack, the two types of cells can be used in combination, thereby reducing the overall cell cost of the system.

[0158] As an example, the charging rate and / or discharging rate of a single battery cell in the energy storage unit 41 can be set to no greater than 1.5C. Preferably, the charging rate of a single battery cell in the energy storage unit 41 is no greater than 1C, and the discharging rate is no greater than 1.5C. For example, the charging rate of a single battery cell in the energy storage unit 41 can be set to 1C, and the discharging rate can be set to 1.5C. Then, the amount of energy that the energy storage unit 41 can store can be set to 5 kWh. In this way, a charging pile (such as an AC charging pile or a DC charging pile) can be used to charge the energy storage unit 41 at a power of 5 kW, so that the energy storage unit 41 can be fully charged 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 no less than 48V. Of course, the rated voltage of the power storage unit can also be designed to be no less than 80V.

[0160] Because the energy storage unit stores significantly more energy than the battery pack, when it charges the battery pack at 5kW, its discharge power is only 1C. Since the battery pack's capacity is much smaller than the storage unit's, a 5kW charging power can support a 10C charging rate for a 500Wh battery pack. Therefore, even with a lower discharge rate, the storage unit can still support high-rate fast charging of the battery pack. Furthermore, the storage unit's cells can be of a different type than those in the battery pack. Specifically, the storage unit's cells can have a higher internal resistance than the battery pack's cells, thus reducing the storage unit's cost.

[0161] The first power conversion unit 42 can be electrically connected to the energy storage unit 41. For example, the first power conversion unit 42 can be connected via, for example, Figure 7 The wiring harness 3 shown establishes a power and communication control connection with the power storage unit 41.

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

[0163] The output interface 43 can be electrically connected to the first power conversion unit 42. For example... Figure 7 As shown, the output interface 43 can be electrically connected to the first power conversion unit 42 via the wiring harness 4. This output interface 43 can output the aforementioned first charging power to charge the battery pack.

[0164] Output interface 43 can charge one battery pack or multiple battery packs simultaneously. As mentioned earlier, the battery pack system can include multiple battery pack groups. Assuming that output interface 43 can support simultaneous charging of N battery packs, in some embodiments, the number of N can be set to be no less than the number of battery packs contained in each battery pack group.

[0165] Output interface 43 may include one or more charging channels, each of which can be used to charge a battery pack. This charging channel can use direct current to charge the battery pack; therefore, it can also be referred to as a DC charging channel.

[0166] This application embodiment does not specifically limit the connection method between the output interface 43 and the battery pack. As an example, such as... Figure 7 As shown, the output interface 43 can provide an external wiring harness 5 (which may include wiring harnesses 5-1 to 5-N). The output interface 43 charges the battery pack through this external wiring harness 5.

[0167] As another example, the output interface 43 can be electrically connected to one or more charging compartments 46 (which may include charging compartments 46-1 to 46-N) via wiring harness 5. The number of charging compartments 46 can be, for example, two. The arrangement of the charging compartments allows the battery pack to be easily installed into the charging system 4 for charging, and the entire process is safe and reliable. Furthermore, the design of the charging compartments also helps to save space occupied by the charging system 4.

[0168] A control module can be installed inside the output interface 43. This control module can be electrically connected to the power interface and communication interface inside the charging compartment 46 via the wiring harness 5, thereby performing power and communication control on the charging process of the battery pack. For example, the output interface 43 can perform one or more of the following operations with the battery pack inside the charging compartment 46 through this control module: communication protocol interaction, charging process control, charging protection, etc.

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

[0170] The charging case 46 can charge the battery pack via wired connection. Alternatively, in some embodiments, the charging case 46 can also charge the battery pack wirelessly. Wireless charging can reduce the number of wires in the charging system 4 and lighten its weight, thereby simplifying the connection between the battery pack and the charging case 46.

[0171] Example 2 mentions that to improve the charging speed of the battery pack, individual battery cells with a high charging rate can be configured, enabling the battery pack to perform high-rate charging. During high-rate charging, due to the large charging current, if the battery pack's temperature is not controlled, it may become too high. A high battery pack temperature will cause two problems. First, if the battery pack temperature exceeds a preset temperature threshold during charging, the charging system 4 may enter a charging protection state. Once in this state, the charging process will be forced to stop. Second, if the battery pack temperature is still high after charging, the battery pack may need to cool down before the discharge process can begin. Both of these problems could potentially cause intermittent operation of the system.

[0172] To avoid the aforementioned problems, a temperature control function can be added to the charging compartment 46, enabling it to control the temperature of the battery pack during charging. For example, a heating device and / or a heat dissipation device can be installed inside the charging compartment 46. The heating device and / or heat dissipation device can dynamically control the ambient temperature of the battery pack during charging and discharging, ensuring continuous charging and allowing the battery pack to immediately discharge to the power tool after charging is complete.

[0173] See also Figure 7 In some embodiments, the charging system 4 may further 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] This application embodiment does not specifically limit the source of input power. Input interface 44 can be used to draw power from DC power and / or AC power. For example, input interface 44 can support receiving input power from one or more devices selected from domestic and international mains sockets, DC charging piles, AC charging piles, mobile power vehicles, and energy storage cabinets (such as large energy storage cabinets).

[0175] The input interface 44 may also include a communication control interface. Through this communication control interface, the input interface 44 can communicate with an external power source to control and negotiate charging protocols. For example, the communication control interface can support multiple communication protocols, enabling the input interface 44 to draw power from different types of power sources or to be compatible with different types of power input methods. As an example, the input interface 44 can perform one or more operations such as interface conversion, charging pile enable / wake-up, and communication protocol parsing for DC or AC charging piles, thereby smoothly guiding the electrical energy from the charging pile to the energy storage unit 41.

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

[0177] The second power conversion unit 45 can convert DC power into a second charging power suitable for charging the energy storage unit 41, thereby charging the energy storage unit 41. For example, the second power conversion unit 45 may include a DC / DC converter. Using this DC / DC converter, the DC power input from the input interface 44 can be converted into DC power with a suitable voltage, and the converted DC power can be used as the aforementioned second charging power to charge the energy storage unit 41. Alternatively, the second power conversion unit 45 may include an AC / DC converter. Using this AC / DC converter, the AC power input from the input interface 44 can be converted into DC power, and the converted DC power can be used as the aforementioned second charging power to charge the energy storage unit 41. Of course, the second power conversion unit 45 can simultaneously support the conversion of both DC power and AC power to the second charging power. For example, the second power conversion unit 45 may simultaneously include a DC / DC converter and an AC / DC converter.

[0178] See Figure 8 In some embodiments, a direct charging channel (i.e., charging port 44) can be provided between the input interface 44 and the power storage unit 41. Figure 8(The charging channel where wiring harness 1 is located). When the input power received by the input interface 44 is DC power, the DC power can be used to charge the energy storage unit 41 directly without going through the second power conversion unit. This DC power can be provided by a common DC power source (such as a battery) or by a DC charging station.

[0179] For example, some DC charging piles support direct charging modules. Therefore, when input interface 44 receives DC power input from such a DC charging pile, it can perform interface conversion, charging pile enable / wake-up, and communication protocol parsing operations to negotiate with the DC charging pile to use direct charging mode. After successful negotiation, input interface 44 can bypass... Figure 7 The second power conversion unit 45 shown directly leads the input power of the DC charging pile to the power storage unit 41, and directly charges the power storage unit 41.

[0180] The direct charging mode eliminates the need for external input power conversion, thereby improving the charging efficiency of the charging system 4.

[0181] like Figure 9 As shown, in some embodiments, the charging system 4 can support an AC inverter output mode. In this mode, the first power conversion unit 42 can convert the electrical energy stored in the energy storage unit 41 into AC power and provide the AC power to the outside through the first AC output interface 47 of the output interface 43. For example, the first power conversion unit 42 may include a DC / AC converter. When the charging system 4 enters the AC inverter output mode, the first power conversion unit 42 uses the DC / AC converter to invert the DC power stored in the energy storage unit 41 into one or more AC power streams (or AC electricity) and provide the one or more AC power streams to the outside through the first AC output interface 47.

[0182] The provision of the first AC output interface 47 enables the charging system 4 to be used as an emergency power supply, backup power supply, or uninterruptible power supply (UPS), thereby expanding the functionality of the charging system 4.

[0183] See Figure 10In 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 earlier, most charging devices on the market currently require power from AC outlets. However, for safety reasons, the power output of AC outlets is usually limited, preventing charging devices from charging battery packs at high power. The charging system 4 provided in this application embodiment utilizes the power storage unit 41 for power supply and is not limited by AC outlets. Therefore, in some embodiments, the charging power of the charging system 4 can be specially customized to make the average charging power (or maximum charging power) of the charging system 4 greater than the power output limit of the AC outlet. In other words, the charging system 4 provided in this application embodiment can break the AC power limitation on charging power to support high-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] Furthermore, the average charging power of the charging system 4 provided in this application embodiment to the battery pack is not less than the average discharging power of the battery pack to the power tool. Specifically, the average charging power of the charging system 4 to the battery pack refers to the average charging power of a single charging compartment to a single battery pack. The average charging power is the charging power input during the effective charging time when the battery pack's charge level increases from an empty state (e.g., below 5% SOC) to a fully charged state (e.g., above 95% SOC), and the average discharging power is the discharging power output during the effective discharging time when the battery pack's charge level decreases from a fully charged state (e.g., above 95% SOC) to an empty state (e.g., below 5% SOC). The effective charging time refers to the sum of the time the battery pack is in a charging state from an empty state to a fully charged state, and the effective discharging time refers to the sum of the time the battery pack is in a discharging state from a fully charged state to an empty state. For example, if the charging process of a battery pack from an empty state to a fully charged state takes 1 hour, including 20 minutes of charging (charging to Q1), 20 minutes of rest, and then another 20 minutes of charging to fully charge from Q1 to Q2, then the effective charging time of the battery pack during the entire charging process is 40 minutes. The average charging power of the battery pack from an empty state to a fully charged state should be the average of the average charging power of the battery pack during different charging periods. In another example, when the charging process of the battery pack is continuous, that is, after the battery pack starts charging from an empty state, it continuously charges to a fully charged state without interruption, then the average charging power of the battery pack is the ratio of the charged amount of the battery pack to the continuous charging time. Similarly, if the battery pack takes one hour to discharge from a fully charged state to an empty state, including 20 minutes of discharge (discharging from Q2 to Q3), 20 minutes of rest, and then another 20 minutes of discharge to fully discharge from Q3 to an empty state, then the effective discharge time of the battery pack during the entire charging process is 40 minutes. The average discharge power of the battery pack from a fully charged state to a fully discharged state is the average of the average discharge power of the battery pack during different discharge periods. In another example, when the discharge process of the battery pack is a continuous process, that is, the battery pack starts discharging from a fully charged state and discharges continuously to a fully discharged state without interruption, then the average discharge power of the battery pack is the ratio of the discharged capacity of the battery pack to the continuous discharge time.

[0188] In another embodiment, the ratio of the average charging power of a single charging compartment to the average discharge rate of a single battery pack to a single power tool can be between 0.5 and 2. That is, the ratio of average charging power to average discharge power can be 0.5, 0.8, 1, or 2. In this embodiment, when the ratio of average charging power to average discharge power is 0.5, three battery packs can be configured for one power tool to achieve uninterrupted power supply, with one battery pack serving as the working battery pack and the other two serving as backup battery packs. When the ratio of average charging power to average discharge power is 0.8, although the average charging power is slightly less than the average discharge power, since users may not use the power tool continuously but intermittently, even if the average charging power is slightly less than the average discharge power, the backup battery pack can still be fully charged before the working battery pack is depleted.

[0189] Preferably, the ratio of average charging power to average discharging power can be 1 to 2. More preferably, the ratio of average charging power to average discharging power can be 1 to 1.2. When the ratio of average charging power to average discharging power is greater than 1, even if the battery pack discharges continuously, the backup battery pack can still be fully charged before the working battery pack is depleted.

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

[0191] Furthermore, since the average charging power of the battery pack is not less than the average discharging power, the effective charging time for the battery pack to go from an empty state to a fully charged state is not greater than the effective discharging time required for the battery pack to go from a fully charged state to an empty state.

[0192] Furthermore, the charging system 4 can support simultaneous charging of multiple battery packs. For example, if the charging system 4 can support simultaneous charging of two battery packs, then the total charging power of the charging system 4 per unit time can reach more than 6KW.

[0193] Example 2 mentions that the charge / discharge rate of the battery pack can be set to no less than 3C. In this case, if the battery pack capacity is set to 0.6 kWh and charged with a 3 kW charging power, the battery pack can be fully charged in 20 minutes. Furthermore, if the power tool's discharge rate is also set to 3 kW, the battery pack can be fully discharged in as little as 20 minutes. Therefore, by adopting the above design, the charging and discharging rates of the battery pack are equal, thus enabling uninterrupted operation of the power tool system using two battery packs.

[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 4: A specific example of a working 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] In this working system, each battery pack in the battery pack system has a capacity of 0.6 kWh, a charging rate and a discharging rate of 5C, a rated voltage of 60V, and a maximum charge-discharge cycle count of no less than 5000 times.

[0202] The charging system 4 is a portable charging system that can be carried around. The energy storage unit 41 within the charging system 4 can hold 10 kWh of energy. 10 kWh of energy is generally sufficient to meet the power needs of maintaining 10-20 gardens per day. The energy storage unit 41 uses a lithium iron phosphate battery. This battery has a charge and discharge rate of 1C and a rated voltage of 48V.

[0203] The energy storage unit 41 can be charged using a DC charging station or an AC charging station. The charging station can provide 10KW of charging power, thereby enabling the energy storage unit 41 to be fully charged in 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 for a single battery pack is set to 3KW, which can quickly charge the battery pack to full charge in 12 minutes.

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

[0206] During the work process, battery packs 1 and 2 can be used to power the power tool system 2. After battery packs 1 and 2 are used up, battery packs 3 and 4 can be used to continue powering the power tool system 2. The discharged battery packs 3 and 4 should then be placed in charging compartments 46-1 and 46-2 respectively for charging. This process should be repeated alternately until the day's garden trimming work is completed.

[0207] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply system, characterized in that, include: The charging system includes: A power storage unit includes one or more battery cells for storing power. An input interface is connected to the one or more battery cells. The input interface is used to receive input power to charge the battery cells. The input power is either DC power or AC power. A first power conversion unit is electrically connected to the energy storage unit and is used to convert the energy stored in the energy storage unit into power to output a first charging power. An output interface is electrically connected to the first power conversion unit and is used to output electrical energy at the first charging power. The energy storage unit can hold no less than 5 kWh of electricity.

2. The power supply system according to claim 1, characterized in that, The power supply system also includes a battery pack system, which comprises multiple battery packs, and the electrical energy output from the output interface is used to charge the battery packs.

3. The power supply system according to claim 2, characterized in that, The charging system further includes at least one charging compartment, which is electrically connected to the output interface, and the charging compartment uses the electrical energy output from the output interface to charge the battery pack.

4. The power supply system according to claim 2, characterized in that, The charging rate of a single cell in the energy storage unit is less than the charging rate of a single cell in the battery pack, and / or the discharging rate of a single cell in the energy storage unit is less than the discharging rate of a single cell in the battery pack.

5. The power supply system according to claim 2, characterized in that, The amount of electricity carried by a single battery pack is no more than one-eighth of the amount of electricity that the energy storage unit can hold.

6. The power supply system according to claim 2, characterized in that, The battery pack has a capacity of not less than 500Wh.

7. The power supply system according to claim 2, characterized in that, The charging rate of a single cell in the energy storage unit is no greater than 1.5C, and / or the discharging rate of a single cell in the energy storage unit is no greater than 1.5C.

8. The power supply system according to claim 2, characterized in that, The charging rate of a single cell in the energy storage unit is no greater than 1C, and the discharging rate of a single cell in the energy storage unit is no greater than 1.5C.

9. The power supply system according to claim 1, characterized in that, The charging system also includes: The second power conversion unit is electrically connected to the input interface and is used to convert the input power into a second charging power to charge the energy storage unit.

10. A charging system, characterized in that, The charging system includes: A power storage unit includes one or more battery cells for storing power. An input interface is connected to the one or more battery cells. The input interface is used to receive input power to charge the battery cells. The input power is either DC power or AC power. A first power conversion unit is electrically connected to the energy storage unit and is used to convert the energy stored in the energy storage unit into power to output a first charging power. An output interface is electrically connected to the first power conversion unit and is used to output electrical energy at the first charging power. The energy storage unit can hold no less than 5 kWh of electricity.

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