Power supply system, operation 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

Technical Field

[0001] The present application relates to the field of electric tools, and more specifically, to a power supply system, a working system and a charging system. Background Art

[0002] In some work scenarios, such as outdoor work scenarios, power tools are often required to work continuously for a long time. In order to achieve uninterrupted operation of power tools, the selection of power source is the primary consideration.

[0003] Generally speaking, power tools that use fuel as a power source (hereinafter referred to as fuel-powered tools, such as gasoline-powered tools) can meet the requirements of long-term uninterrupted work. However, the main problem with fuel-powered tools is that the exhaust gas they release will pollute the environment, and the noise of fuel-powered tools during operation is relatively loud, which will cause noise pollution to the surrounding environment.

[0004] Electric tools are environmentally friendly and clean, and they also produce relatively less noise than fuel-powered tools. Therefore, electric tools are increasingly favored by power tool users. However, the main problem with electric tools is that the battery pack can only provide a short battery life. This problem is particularly prominent outdoors or in scenes where there is no mains socket.

[0005] Therefore, in the field of power tools, especially in the field of commercial power tools with higher rated power requirements, despite the obvious defects of fuel-powered tools, they are still the first choice of power tool users. Summary of the invention

[0006] In view of this, the present application provides a power supply system, a working system and a charging system, which can solve the power supply problem of the power tool system to a certain extent and expand the application occasions of the power tool.

[0007] In a first aspect, a power supply system is provided, comprising: a battery pack system, comprising a plurality of battery packs, for alternately supplying power to an electric tool system, wherein the electric tool system comprises a plurality of garden-type electric tools; a portable energy storage charging system, wherein the charging system comprises: an input interface, for receiving input power, wherein the input power is DC power or AC power; an electric power storage unit, comprising one or more battery packs, for charging the one or more battery packs with the DC power or AC power to store electric power; a first power conversion unit, electrically connected to the electric power storage unit, for converting the electric power stored in the electric power storage unit into electric power; and a power conversion unit, wherein the power conversion unit is electrically connected to the electric power storage unit, and wherein the power conversion unit is electrically connected to the electric power storage unit. Change to a first charging power; an output interface, electrically connected to the first power conversion unit, for outputting the first charging power; a plurality of charging compartments, electrically connected to the output interface, the charging compartments being used to place the battery packs, and using the first charging power output by the output interface to charge the battery packs; wherein the plurality of charging compartments are configured to charge the battery packs in an idle state in the battery pack system during the operation of the power tool system, so that before one group of battery packs in the plurality of battery packs is completely discharged to the power tool system, at least one group of battery packs in the plurality of battery packs is charged to a fully charged state.

[0008] In a second aspect, a power supply system is provided. The power supply system comprises: a battery pack system, comprising a plurality of battery packs, for alternately supplying power to an electric tool system, wherein the electric tool system comprises one or more electric tools; and a charging system, for charging an idle battery pack in the battery pack system during operation of the electric tool system, wherein the charging speed of the charging system for the battery pack system is not less than the discharging speed of the battery pack system for the electric tool system.

[0009] According to a third aspect, a power supply system is provided, comprising: an electric tool system, comprising a plurality of high-power electric tools, wherein the high-power electric tools are electric tools with a rated power greater than or equal to 1 kW and less than or equal to 3 kW; 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 for the operation of the electric tool system; and a portable charging system, for charging an idle battery pack in the battery pack system during the operation of the electric tool system, wherein the charging speed of the battery pack by the charging system is not less than the maximum discharge speed of the battery pack to the electric tool system.

[0010] In a fourth aspect, a power supply system is provided, comprising: an electric tool system, comprising a plurality of garden-type electric tools; a battery pack system, comprising two groups of battery packs, for alternately powering the electric tool system; and a portable charging system, capable of simultaneously charging one group of the two groups of battery packs, and a charging speed of the charging system for the one group of battery packs is not less than a maximum discharge speed of the one group of battery packs for the electric tool system.

[0011] In a fifth aspect, 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.

[0012] In a sixth aspect, a charging system is provided, wherein the charging system is a portable charging system suitable for charging a battery pack of a high-power electric tool, wherein the high-power electric tool is an electric tool with a rated power greater than or equal to 1 kW and less than or equal to 3 kW, and the charging system comprises: 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; an output interface electrically connected to the first power conversion unit, for outputting the first charging power to charge the battery pack, and the charging power of the output interface is configured so that the charging speed of the output interface to the battery pack is not less than the discharge speed of the battery pack to the high-power electric tool.

[0013] In the seventh aspect, a working method is provided, comprising: during the operation of the electric tool system, using multiple battery packs in a battery pack system to alternately power the electric tool system; using a charging system to charge the battery packs in an idle state in the battery pack system, and the charging speed of the charging system to the battery pack system is not less than the discharge speed of the battery pack system to the electric tool system.

[0014] In an eighth aspect, a working method is provided, comprising: using a plurality of garden-type power tools to trim a first garden, wherein during the process of trimming the first garden, the plurality of garden-type power tools are powered by a first battery pack; after trimming the first garden, using a plurality of garden-type power tools to trim a second garden, wherein during the process of trimming the second garden, the plurality of garden-type power tools are powered by a second battery pack; and charging the first battery pack using a charging system so that before trimming the second garden, the first battery pack is charged to a fully charged state.

[0015] The present application provides a power supply system, a working system and a charging system.

[0016] The first aspect of the present application provides a power supply system, comprising: a battery pack system, comprising a plurality of battery packs, for alternately powering an electric tool system, wherein the electric tool system comprises a plurality of garden-type electric tools; a portable energy storage charging system, wherein the charging system comprises: a power storage unit, comprising one or more battery cells, wherein the battery cells are used to store power; an input interface, connected to the one or more battery cells, wherein the input interface is used to receive input power to charge the battery cells, wherein the input power is DC power or AC power; a first power conversion unit, electrically connected to the power storage unit, and used to perform power conversion on the power stored in the power storage unit to output a first charging power; an output interface; and A port is electrically connected to the first power conversion unit and is used to output electric energy at the first charging power; a plurality of charging compartments are electrically connected to the output interface, the charging compartments are used to place the battery packs, and use the electric energy output by the output interface to charge the battery packs; wherein, 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 average value of the charging power required during the effective charging time for charging the battery pack from an empty state to a fully charged state, and the average discharging power is the average value of the discharging power required during the effective discharging time for discharging the battery pack from a fully charged state to an empty state.

[0017] In one embodiment, the maximum continuous charging power of the charging bin for the battery pack is not less than 2.4KW; preferably, the maximum continuous charging power of the charging bin for the battery pack is not less than 3KW.

[0018] In one embodiment, the average charging power required to charge the battery pack from an empty state to a fully charged state within the continuous charging time is not less than the average discharging power required to discharge the battery pack from a fully charged state to an empty state within the continuous discharging time.

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

[0020] In one embodiment, the internal resistance of the single cells of the battery pack is configured so that the maximum continuous charge rate of the battery pack is not less than the maximum continuous discharge rate of the battery pack.

[0021] In one embodiment, the internal resistance of the single cells of the battery pack is configured so that the maximum continuous charge rate and / or the maximum continuous discharge rate of the battery pack is not less than 3C, and the charging power of the charging compartment to the battery pack is configured so that the charging time of the battery pack is not more than 20 minutes;

[0022] Preferably, the internal resistance of the single cells of the battery pack is configured so that the maximum continuous charge rate and / or the maximum continuous discharge rate of the battery pack is not less than 4C, and the charging power of the charging compartment to the battery pack is configured so that the charging time of the battery pack is not more than 15 minutes;

[0023] Preferably, the internal resistance of the single cells of the battery pack is configured so that the maximum continuous charging rate and / or the maximum continuous discharge rate of the battery pack is not less than 5C, and the charging power of the battery pack by the charging bin is configured so that the charging time of the battery pack is not more than 12 minutes.

[0024] 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 electricity storage unit can accommodate.

[0025] In one embodiment, the power storage unit can accommodate a power of no less than 5 KWH.

[0026] In one embodiment, the capacity of the battery pack is not less than 500WH.

[0027] In one embodiment, the capacity of the single cells in the battery pack is not less than 10AH, and the number of the single cells in the battery pack is not more than 15.

[0028] In one embodiment, the charge rate and discharge rate of the single cells in the power storage unit are respectively smaller than the charge rate and discharge rate of the single cells in the battery pack.

[0029] In one embodiment, the charge rate and discharge rate of the single battery cells in the power storage unit are both no greater than 1.5C.

[0030] In one embodiment, the maximum charge and discharge cycle number of the battery pack is not less than 3000 times; preferably, the maximum charge and discharge cycle number of the battery pack is not less than 5000 times.

[0031] In one embodiment, the charging compartment and / or the battery pack further includes a heating device and / or a heat dissipation device for controlling the temperature of the battery pack so that the battery pack can be continuously charged and discharged.

[0032] In one embodiment, multiple charging bays are configured to charge idle battery packs in the battery pack system during operation of the power tool system, so that at least one group of the multiple battery packs is charged to a fully charged state before one group of battery packs completely discharges the power tool system.

[0033] In one embodiment, the first power conversion unit is further used to convert the power stored in the power storage unit into AC power; the output interface includes a first AC output interface for outputting the AC power to the outside.

[0034] In one embodiment, the charging system further includes: a second power conversion unit, electrically connected to the input interface, and configured to convert the input power into a second charging power to charge the power storage unit.

[0035] In one embodiment, the input interface is used to receive the input power from one or more of the following devices: a mains socket, a DC charging pile, an AC charging pile, a mobile power supply vehicle, and an energy storage cabinet.

[0036] 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.

[0037] In one embodiment, a direct charging channel is provided between the input interface and the power storage unit, and the direct charging channel is used to directly charge the power storage unit with the DC power when the input power is DC power.

[0038] In one embodiment, the charging system further includes: a second AC output interface, configured to output the AC power externally when the input power is AC power.

[0039] In one embodiment, the second AC output interface is used to charge the battery pack via a charger and / or a charger.

[0040] In one embodiment, the first power conversion unit is further used to convert the power stored in the battery pack into a third charging power to charge the power storage unit.

[0041] In one embodiment, the maximum charging power of the charging system is greater than the power limit of the mains socket.

[0042] In one embodiment, the power supply system further includes: a back frame detachably connected to the battery pack.

[0043] In one embodiment, the rated power of the electric tool is greater than or equal to 1 KW and less than or equal to 3 KW.

[0044] In one embodiment, the number of battery packs in the battery pack system is equal to twice the number of battery packs required for use when the power tool system is operating.

[0045] The second aspect of the present application provides a power supply system, including: 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, wherein the charging system includes: a power storage unit, including one or more battery cells, wherein the battery cells are used to store power; an input interface, connected to the one or more battery cells, wherein the input interface is used to receive input power to charge the battery cells, wherein the input power is DC power or AC power; a first power conversion unit, electrically connected to the power storage unit, and used to perform power conversion on the power stored in the power storage unit to output a first charging power; an output interface, connected to the The first power conversion unit is electrically connected and is used to output electric energy at the first charging power; a plurality of charging compartments are electrically connected to the output interface, and the charging compartments are used to place the battery packs and charge the battery packs with the electric energy output by the output interface; wherein the ratio of the average charging power of a single charging compartment to a single battery pack to the average discharging power of a single battery pack to the power tool is between 0.5 and 2, the average charging power is the average value of the charging power required within the effective charging time for charging the battery pack from an empty state to a fully charged state, and the average discharging power is the average value of the discharging power required within the effective discharging time for discharging the battery pack from a fully charged state to an empty state.

[0046] The third aspect of the present application provides a charging system, which includes: a power storage unit, including one or more battery cells, and the battery cells are used to store power; an input interface, connected to the one or more battery cells, and the input interface is used to receive input power to charge the battery cells, and the input power is DC power or AC power; a first power conversion unit, electrically connected to the power storage unit, and used to convert the power stored in the power storage unit to output a first charging power; an output interface, electrically connected to the first power conversion unit, and used to output electric energy at the first charging power; at least one charging compartment, electrically connected to the output interface, and the charging compartment is used to place the battery pack and use the electric energy output by the output interface to charge the battery pack; wherein the average charging power of the charging compartment to the battery pack is not less than 2.4KW.

[0047] In one embodiment, the average charging power of the charging compartment for a single battery pack is not less than 3KW.

[0048] A fourth aspect of the present application provides a working system, comprising: an electric tool system and the aforementioned power supply system.

[0049] The fifth aspect of the present application provides a working method, including: using multiple garden-type power tools to trim a first garden, wherein during the process of trimming the first garden, the multiple garden-type power tools are powered by a first group of battery packs; after trimming the first garden, using multiple garden-type power tools to trim a second garden, wherein during the process of trimming the second garden, the multiple garden-type power tools are powered by a second group of battery packs; using a charging system to charge the first group of battery packs, so that before trimming the second garden, the first group of battery packs is charged to a fully charged state, 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 tool.

[0050] In one embodiment, the charging system is an energy storage charging system, and the amount of electricity stored in the charging system can support the plurality of gardening power tools to trim 10 to 20 gardens. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the structure of the working system provided in the embodiment of the present application.

[0052] Figure 2 for Figure 1 An example diagram of a working system in .

[0053] Figure 3 yes Figure 2 Example diagram of application scenarios of the working system in .

[0054] Figure 4 yes Figure 2 An example diagram of the working method of the working system in .

[0055] Figure 5 It is a schematic diagram of a possible installation method of the battery pack provided in an embodiment of the present application.

[0056] Figure 6 It is a schematic diagram of another possible installation method of the battery pack provided in an embodiment of the present application.

[0057] Figure 7 It is a structural schematic diagram of a charging system provided in one embodiment of the present application.

[0058] Figure 8 It is a structural schematic diagram of a charging system provided in another embodiment of the present application.

[0059] Fig. 9 It is a structural schematic diagram of a charging system provided in yet another embodiment of the present application.

[0060] Fig.10 It is a structural schematic diagram of a charging system provided in yet another embodiment of the present application.

[0061] Fig.11 It is a structural schematic diagram of a charging system provided in yet another embodiment of the present application.

[0062] Fig.12 It is a structural schematic diagram of a charging system provided in yet another embodiment of the present application.

[0063] Fig.13 yes Figure 1 Another example diagram of a working system in . DETAILED DESCRIPTION

[0064] According to the different power sources, power tools can be divided into electric tools and fuel-powered tools. The advantage of fuel-powered tools is that they can work continuously for a long time with greater power. The disadvantage is that they pollute the environment and make a lot of noise when working, which will cause noise pollution to the surrounding environment. Therefore, people have been looking for alternatives to fuel-powered tools.

[0065] Electricity is an environmentally friendly and clean energy source. Therefore, power tools are becoming more and more popular. However, the main problem with current power tools, especially high-power power tools with a rated power (or working power) of more than 1KW, is insufficient power supply, which cannot support the power tools to work continuously for a long time. Taking power tools with a rated power of 1KW to 3KW as an example, the current battery pack can only support this type of power tool to work continuously for a few minutes at most. Once the battery pack is exhausted, it often takes several hours to charge the battery pack. The above problem is usually referred to as the power anxiety problem of power tools.

[0066] The following uses gardening tools as an example to illustrate this issue in more detail.

[0067] Garden tools usually refer to equipment used to maintain garden landscapes. Garden tools usually work on lawns, hedges, flowers, trees or gardens. There are many types of garden tools, for example, they can include one or more of the following tools: lawn mowers, lawn mowers, hedge trimmers, chain saws, hair dryers, leaf shredders, snow blowers, etc.

[0068] Garden tools can be divided into two types: home and commercial. Commercial garden tools are professional power tools designed for gardeners or garden companies. Compared with home 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 higher.

[0069] For commercial gardening tools, a common usage scenario is that 2-3 workers form a team and work outside for a day to trim the gardens of 10-20 families. For garden trimming work, mowing the lawn usually takes the longest time. Although the size of lawns in different families is not the same, the average time for mowing the lawn is about 20-40 minutes. Therefore, every time a garden is reached, worker A will immediately start mowing the lawn with a lawn mower. While worker A is mowing the lawn, worker B will complete other types of work in sequence, such as worker B will first mow the grass, then prune the branches, and then blow the grass. Workers A and B complete all the work at almost the same time. Therefore, a team works in a garden for about 20-40 minutes (roughly the same time as mowing the lawn). Once a garden is trimmed, the team will go to another garden and repeat the above work process until all the work tasks for the day are completed.

[0070] Garden maintenance work itself has the attribute of green and environmental protection. Therefore, for garden workers or garden companies, electric tools are the most ideal choice. However, it can be seen from the above description that commercial garden tools have very high requirements for the working efficiency of power tools, and users usually hope that the power source of power tools can support uninterrupted work outside for a day. The above requirements are very difficult to meet for current electric tools. Furthermore, considering that garden work is usually carried out outdoors, and there are often no AC power sockets outdoors, even if electric tools are used, they cannot be recharged in time. For the above reasons, current commercial garden tools are mainly fuel-powered tools. Although a small number of commercial garden tools also use electric tools, these electric tools are generally only used as auxiliary work tools.

[0071] The above uses the gardening work scenario as an example. In fact, there are many other work scenarios that have high requirements for the working time or working efficiency of power tools, such as using cleaning tools to provide cleaning services for various families or companies, or using machining or assembly power tools to process parts or assemble equipment. If power tools are to be widely used in the above scenarios, the main problem is how to increase the working time of power tools.

[0072] In order to increase the working time of power tools, one possible solution is to equip the power tools with large-capacity battery packs. However, although battery pack developers have made a lot of research and efforts in terms of battery pack capacity and performance, the performance of current large-capacity battery packs is still unsatisfactory and still cannot make the working time of power tools reach a satisfactory level.

[0073] The current large-capacity battery packs mainly have the following problems.

[0074] First, in the field of power tools, the capacity of the single cells in the large-capacity battery packs on the market is generally small (generally less than 5AH). In order to increase the capacity of the battery pack, the common practice of battery pack manufacturers is to increase the number of single cells in the battery pack. For example, the number of single cells in the common large-capacity battery packs on the market is generally more than 30. However, the weight of the battery pack generally needs to be maintained within a reasonable range, so the increase in the number of single cells is limited, that is, the increase in the capacity of the battery pack by increasing the number of single cells is limited. For example, the current mainstream large-capacity, multi-cell battery packs on the market can generally store no more than 300WH of electricity, which is still far from enough for power tools, especially high-power power tools. As an example, for a power tool with a rated power of 3kw, 300WH of electricity may be consumed in a few minutes, at most ten minutes.

[0075] Secondly, in the field of power tools, the charge and discharge rate performance of the single cells in large-capacity battery packs is generally low, and the number of charge and discharge cycles is generally short. For example, the charge rate of the single cells in large-capacity battery packs on the market is usually around 0.3C, and the discharge rate is generally around 1C. The lower charge rate results in a longer charging time for the battery pack, while the lower discharge rate results in limited discharge power of the battery pack, which in turn leads to low working efficiency of high-power power tools.

[0076] Thirdly, the maximum number of charge and discharge cycles (or cycle life) of single cells in large-capacity battery packs on the market is generally less than 1,000 times. A lower number of charge and discharge cycles will result in a shorter battery pack life, requiring frequent replacement, which undoubtedly increases the cost of using power tools.

[0077] Fourthly, traditional large-capacity battery packs charge slowly. The reason why the battery pack charges slowly is that, on the one hand, it is limited by the poor performance of the single cell itself (such as the charging rate), and on the other hand, it is limited by the low charging power that the charging device of the battery pack can provide. Currently, charging devices on the market generally need to draw power from a mains socket. However, for safety reasons, the power that a mains socket can provide is usually limited. For example, the power of mains sockets in North America is generally limited to 1.8KW, and the power of mains sockets in Europe is generally limited to 3.6KW. Due to the limited power of the mains socket, charging devices on the market cannot charge the battery pack at high power. Once the power of a large-capacity battery pack is exhausted, it is usually necessary to charge the battery pack for a long time (much longer than the battery life that the battery pack can provide).

[0078] Fifthly, if the user needs to use the power tool for a long time outdoors or in places without a mains socket, once the battery pack runs out of power, the work will be forced to stop because the power cannot be replenished in time. Of course, in order to meet the power supply of the power tool for a longer period of time, the user can buy many spare battery packs. However, a large number of battery packs is not convenient to carry on the one hand, and on the other hand it will bring huge cost pressure. Considering the above two points, it can be seen that this solution is not actually feasible.

[0079] In summary, traditional large-capacity battery packs cannot be widely used in power tools that require high rated power and working time due to low discharge power, slow charging speed, short life, and inconvenient charging. It is precisely because of the above reasons that in many power tool fields, especially commercial power tool fields, although fuel-powered tools have obvious defects, they are still the first choice of users, and electric tools are usually used as auxiliary working tools at most.

[0080] It is generally believed that the power anxiety problem of power tools is a natural defect of power tools compared with fuel-powered tools. Unless the battery pack technology develops by leaps and bounds, the above problem cannot be solved in the short term.

[0081] The embodiment of the present application provides a different problem-solving approach, which enables the power tool to work continuously for a long period of time (such as 1 day) by reasonably designing a set of working systems and working methods. During this period of time, the user of the power tool does not have to worry about the problem of insufficient power supply. This problem-solving approach helps to truly realize the comprehensive transformation of fuel-powered tools to electric tools. The working system and the working method are described in detail below in combination with different embodiments.

[0082] Example 1: Working system

[0083] like Figure 1 As shown, the working system 1 provided in the first embodiment may include an electric tool system 2 , a battery pack system 3 and a charging system 4 .

[0084] The power tool system 2 may include one or more power tools ( Figure 1 N power tools are shown, where N is a positive integer not less than 1). For example, if the work content that the power tool system needs to perform is single and can be completed by one type of power tool, then only one power tool can be configured for the user of the work system 1. For another example, if the work content that the power tool system 2 needs to perform is diverse and requires multiple power tools to cooperate with each other to complete, in this case, multiple power tools can be configured for the user of the work system 1.

[0085] Taking garden maintenance work as an example, as mentioned above, garden maintenance work usually includes mowing, pruning, trimming the grass and blowing the grass. Figure 2 An example of a power tool system 2 that can be configured for a user of the work system 1 for garden pruning work is shown. The power tool system 2 may include four power tools, namely a lawn mower 21, a pruner 22, a grass trimmer 23 and a hair dryer 24 (or a grass blower).

[0086] See again Figure 1 The type of electric tools in the electric tool system 2 can be determined according to the work content of the electric tool system 2. Taking garden trimming work as an example, the electric tools in the electric tool system 2 can be garden-type electric tools (sometimes also referred to as garden-type electric tools or electric garden tools). Garden-type electric tools can include, for example, one or more of the following electric tools: lawn mowers, lawn mowers, hedge trimmers, chain saws, hair dryers, leaf shredders, snow blowers, etc.

[0087] Taking cleaning work in a home or office area as an example, the power tools in the power tool system 2 may be several power cleaning tools. The power cleaning tools may include, for example, vacuum cleaners, floor scrubbers, etc. Alternatively, taking mechanical processing or parts assembly work as an example, the power tool system 2 may include power tools for mechanical processing or assembly such as electric hammers and electric drills.

[0088] The power tools in the power tool system 2 may be power tools with higher rated power requirements. In the embodiment of the present application, such power tools are referred to as high-power power tools. In conventional technology, the characteristics of high-power power tools are: the battery pack of such power tools requires a long time to be recharged after being exhausted, but the discharge time (or battery life) that the battery pack can provide to the power tool is short. In some embodiments, a high-power power tool may refer to a power tool with a rated power (or maximum operating power) greater than 1KW. For example, a high-power power tool may refer to a power tool with a rated power of 1KW to 3KW.

[0089] Continue to see Figure 1 In order to meet the power supply requirements of the electric 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. The multiple battery packs can be used to alternately power the electric tool system 2 .

[0090] The number of battery packs in the battery pack system 3 can be configured to be no less than twice the number of battery packs required for the operation of the power tool system 2. The number of battery packs required for the operation of the power tool system 2 can be understood as the maximum number of battery packs that the power tool system 2 needs to use at the same time when it is working.

[0091] Take garden maintenance work as an example. Figure 2 As shown, the power tool system 2 may include a lawn mower 21, a pruner 22, a grass trimmer 23 and a blower 24. Every time he arrives at a garden, worker A will use the lawn mower 21 to mow the grass. While worker A is mowing the grass, worker B will complete the tasks of mowing, pruning, blowing the grass, etc. in sequence (worker A's work can also be replaced by an automatic lawn mower). For this type of work, the lawn mower 21 itself needs to be powered by a battery pack. Since the work of the pruner 22, the grass trimmer 23 and the blower 24 is completed in sequence, they can share a battery pack. It can be seen that in this example, the number of battery packs required for the power tool system 2 to work is at most 2. Therefore, the battery pack system 3 may include 4 battery packs, such as Figure 2 The battery packs 31 , 32 , 33 and 34 are shown.

[0092] Of course, the above is only an example of the configuration of the battery packs in the battery pack system 3, and the embodiments of the present application are not limited thereto, as long as the battery packs in the battery pack system 3 can meet the alternating power supply of the power tool system 2. For example, in some embodiments, the number of battery packs in the battery pack system 3 can also be set to more than twice the number of battery packs required when all power tools in the power tool system 2 work simultaneously, regardless of the working order of the power tools. Figure 2 For example, since the lawn mower 21, the pruner 22, the grass trimmer 23 and the hair dryer 24 all require a battery pack to supply power when working, a total of four battery packs are required to supply power to the four power tools when working. Therefore, the number of battery packs in the battery pack system 3 can be configured to 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 for the power tool system 2 to work. This method of configuring the number of battery packs can achieve alternating power supply of multiple battery packs to the power tool system 2 with a minimum number of battery packs, thereby reducing the cost of the battery pack system 3.

[0093] As mentioned above, the multiple battery packs in the battery pack system 3 can be used to alternately power the power tool system 2. In specific implementation, the multiple battery packs can be divided into multiple groups of battery packs. The number of battery packs contained in each group of battery packs can be equal to the number of battery packs required for the power tool system 2 to work. Then, the multiple groups of battery packs can be used to alternately power the power tool system 2.

[0094] The embodiment of the present application does not specifically limit the grouping method of multiple battery packs. As an example, multiple battery packs can be divided into multiple groups in advance, and when actually used, the power tool system 2 is powered alternately according to the pre-divided groups. As another example, multiple battery packs may not be grouped in advance. For example, when the power tool system 2 needs to be used for work, 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 a group of battery packs. After the group of battery packs is discharged, the user of the power tool system 2 can select some battery packs from the remaining battery packs to power the power tool system 2, and the part of the battery packs selected again by the user of the power tool system 2 naturally forms another group of battery packs. Of course, if the number of the multiple battery packs is twice the number of battery packs required for the power tool system 2 to work, the user will naturally divide the multiple battery packs into two groups of battery packs when randomly selecting some battery packs from the multiple battery packs to power the power tool system 2 for the first time.

[0095] Multiple battery packs alternately (or in turns) power the power tool system 2 means that after one battery pack is completely discharged, a battery pack is selected from the remaining battery packs in a charged state to continue to power the power tool system 2. Multiple battery packs can alternately power the power tool system 2 in a certain order. For example, assuming that multiple battery packs are divided into K groups, multiple battery packs alternately powering the power tool system 2 can be implemented in the following manner: use the first to Kth battery packs in sequence to supply power, and after the Kth battery pack has finished supplying power, use the first to Kth battery packs in sequence again to supply power.

[0096] It should be noted that, in the process of multiple battery packs alternately supplying power to the power tool system 2, the embodiment of the present application does not require that one battery pack be replaced by another battery pack at the same time. In other words, the time when the battery packs in the same group are replaced can be the same or different, as long as one battery pack is eventually replaced by another battery pack.

[0097] For example, the battery pack system 3 includes a first group of battery packs and a second group of battery packs, wherein the first group of battery packs includes battery pack A and battery pack B, and the second group of battery packs includes battery pack C and battery pack D. Assume that the power tool system 2 is first powered by the first group of battery packs, but due to certain differences in the discharge speeds of different power tools in the power tool system 2, battery pack A discharges faster and battery pack B discharges slower. After battery pack A is fully discharged, battery pack A can be replaced with battery pack C in the second group of battery packs. Then, after battery pack B is fully discharged, battery pack B can be replaced with battery pack D in the second group of battery packs. It can be seen from the above battery pack replacement process that battery pack C and battery pack D do not replace battery pack A and battery pack B at the same time, but from the overall point of view, it can still be understood that the second group of battery packs replaces the first group of battery packs and continues to power the power tool system 2.

[0098] After the battery pack in the battery pack system 3 is discharged, if it cannot be recharged in time, it cannot alternately supply power to the electric tool system 2. Figure 1 In order to meet the power replenishment demand 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 electric tool system 2.

[0099] The charging system 4 can be a generator or an energy storage charging system. The generator can be, for example, a generator using solar energy or a generator using mechanical energy. The energy storage charging system can store a certain amount of electricity inside it, and then use the electricity to charge external devices. The following embodiment 3 will give a detailed example of the structure of the energy storage charging system, and the first embodiment will mainly introduce it from the functional level.

[0100] During the operation of the power tool system 2, the power tool system 2 will occupy a group of battery packs in the battery pack system 3, and the battery packs not occupied by the power tool system 2 are called idle battery packs. The charging system 4 can charge the idle battery packs.

[0101] It should be noted that, in some cases, some of the battery packs in the idle state may have sufficient power and do not need to be charged. For example, when the power tool system 2 is initially working, multiple battery packs may all be fully charged, and even if there are battery packs in the idle state, they do not need to be charged. Therefore, the embodiment of the present application does not require the charging system 4 to charge all battery packs in the idle state. If all battery packs in the idle state are low on power, the charging system 4 can charge all battery packs in the idle state; if the battery packs in the idle state include both low-power battery packs and fully-charged battery packs, the charging system 4 can only charge the low-power battery packs.

[0102] As mentioned above, the embodiment of the present application hopes that the electric tool system 2 has the ability to work continuously for a long period of time (such as a day). To achieve this, during the operation of the electric tool system 2, the charging capacity of the charging system 4 to the battery pack system 3 must not be less than the discharge capacity of the battery pack system 3 to the electric tool system 2. Alternatively, during the operation of the electric tool system 2, the charging speed (or average charging speed) of the charging system 4 to the battery pack system 3 must not be less than the discharge speed (average discharge speed) of the battery pack system 3 to the electric tool system 2.

[0103] During the operation of the electric 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 electric tool system 2, the amount of electricity input by the charging system 4 to the battery pack system 3 is not less than the amount of electricity output by the battery pack system 3 to the electric tool system 2, thereby ensuring that the battery pack system 3 as a whole will not be in short supply due to the power consumption of the battery pack by the electric tool system 2. In other words, during the operation of the electric tool system 2, the charging system 4 charges the battery pack system 3 so 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 electric tool system 2). For example, the charging system 4 charges the battery pack system 3 so that during the operation of the electric tool system 2, at least one group of battery packs in the battery pack system 3 is always in a charged state.

[0104] 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 charges the battery packs in the battery pack system 3 that are in an idle state. Therefore, the "charging capacity or charging speed of the charging system 4 for the battery pack system 3" mentioned above can be indirectly measured by the charging speed of the charging system 4 for the battery packs in an idle state. For example, if the charging system 4 charges a single battery pack faster, and / or the charging system can charge more battery packs at the same time, it means that the charging system 4 charges the battery pack system 3 faster.

[0105] Similarly, during the operation of the electric tool system 2, the battery pack system 3 does not discharge the electric tool system 2 as a whole, but selects a group of battery packs from the battery pack system 3 to discharge the electric tool system 2. Therefore, the "discharge capacity or discharge speed of the battery pack system 3 to the electric tool system 2" mentioned above can be indirectly measured by the discharge speed of these selected battery packs used to discharge the electric tool system 2. For example, the more battery packs are required for the operation of the electric tool system 2, and / or the faster the discharge speed of a single battery pack during use, the faster the discharge speed of the battery pack system 3 to the electric tool system 2.

[0106] It should also be noted that the embodiment of the present application does not require that the charging speed of the charging system 4 to the battery pack system 3 must not be 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 in a fully charged state. In this case, the embodiment of the present application does not require that the charging speed of the charging system 4 to the battery pack system 3 must not be less than the discharging speed of the battery pack system 3 to the power tool system 2. Therefore, the charging speed of the charging system 4 to the battery pack system 3 mentioned in the embodiment of the present application must not be less than the discharging speed of the battery pack system 3 to the power tool system 2 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 must not be 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 will not drop to a level that cannot meet the power supply requirements of the power tool system 2.

[0107] There are many ways to achieve 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, as a possible implementation, the charging power of the charging system 4 can be configured so that the charging speed of the charging system 4 to any battery pack is not less than the discharging speed of the battery pack to the power tool in the power tool system 2. The discharging speed of the battery pack to the power tool can be the average discharging speed of the battery pack to the power tool, or it can be the maximum discharging speed of the battery pack to the power tool (the discharging speed of the battery pack at the maximum working power of the power tool). In other words, the charging speed of the charging system 4 to the battery pack and the discharging speed of the battery pack to the power tool can be configured so that the full charging time of the battery pack is not less than the emptying time of the battery pack.

[0108] For example, the battery pack system 3 includes two groups of battery packs. During the initial working stage of the power tool system 2, both groups of battery packs are fully charged. At this time, the first group of battery packs can be used to power the power tool system 2. After the first group of battery packs is discharged, the second group of battery packs can be used to replace the first group of battery packs, and the charging system 4 can be used to charge the first group of battery packs that are low on power. In this example, the charging speed of the charging system 4 can be configured so that the charging speed of the charging system 4 for any battery pack is not less than the discharge speed of the battery pack for the power tool. In this way, after the second group of battery packs is discharged, the first group of battery packs has been fully charged and can continue to power the power tool system 2.

[0109] Of course, the implementation method mentioned above is an example, and the embodiment of the present application does not require that the charging speed of the charging system 4 for a single battery pack must be greater than the discharge speed of the single battery pack for the power tool. In some cases, even if the charging system 4 charges a single battery pack at a speed lower than the discharge speed of the battery pack for the power tool, as long as the number of battery pack groups and the number of charging interfaces or charging channels of the charging system 4 are reasonably set, the uninterrupted power supply of the power tool system 2 can still be achieved.

[0110] Take the battery pack system 3 including three groups of battery packs as an example. Assuming that in the initial working stage of the electric tool system, all three groups of battery packs are in a fully charged state, the first group of battery packs can be used to power the electric tool system 2 first. After the first group of battery packs is discharged, the second group of battery packs can be used to replace the first group of battery packs to continue to power the electric tool system 2, and the charging system 4 can be used to charge the first group of battery packs that are insufficient in power. After the second group of battery packs is discharged, the third group of battery packs can be used to replace the second group of battery packs to continue to power the electric tool system 2, and the charging system 4 can be used to charge the second group of battery packs that are insufficient in power. When the charging system 4 starts to charge the second group of battery packs, this example does not require that the charging system 4 has already charged the first group of battery packs to a fully charged state. In fact, the charging system 4 can charge the first group of battery packs and the second group of battery packs at the same time, as long as the charging system 4 can charge the first group of battery packs to a fully charged state when the third group of battery packs is discharged. It can be seen from this that if three battery packs are configured for the power tool system 2, and the charging system 4 can support 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 the battery pack for the power tool, continuous power supply to the power tool system 2 can still be achieved.

[0111] For ease of understanding, the following Figures 2 to 4, taking garden pruning work as an example, the working method of the above working system is illustrated. It should be understood that the working method can be implemented by a user of a gardening power tool. The user of the gardening power tool can be, for example, a gardener or a gardening company.

[0112] First of all, in order to successfully complete the gardening work, a suitable power tool system can be configured according to the work content of the gardening work. Figure 2 An example of an electric tool system 2 that may be used for gardening work is given. The electric tool system 2 may include four gardening electric tools, namely a lawn mower 21 , a pruning machine 22 , a grass trimmer 23 and a hair dryer 24 .

[0113] Next, a battery pack system 3 and a charging system 4 may be configured according to the number of garden-type electric tools in the electric tool system 2 and the working order of each electric tool. Figure 2 As shown, for the electric tool system 2 formed by the lawn mower 21, the pruner 22, the grass trimmer 23 and the hair dryer 24, four battery packs 31, 32, 33, 34 can be configured in the battery pack system 3, and the four battery packs can be divided into two groups, each with two battery packs. After configuring the various components in the working system, you can start working with the working system.

[0114] like Figure 3 As shown, first, the user of the working system 2 can first come to the first garden and use a plurality of gardening electric tools to trim the first garden. In the process of trimming the first garden, the first battery pack can be used to supply power.

[0115] by Figure 4 For example, after arriving at the first garden, worker A can install the battery pack 31 on the lawn mower 21 and push the lawn mower 21 to mow the grass (of course, if an intelligent lawn mower is used, the work of worker A can be completed by the intelligent lawn mower). Worker B uses a backpack to carry the battery pack 32 on his back, and uses the battery pack 32 to power the lawn mower 23, the pruning machine 22 and the hair dryer 24 in turn, thereby completing the mowing, pruning and blowing work in turn. In general, the time spent on mowing is roughly equivalent to the total time spent on mowing, pruning and blowing. For a garden of about 1,000 square meters, it can basically be trimmed within 20-40 minutes.

[0116] After the first garden was renovated, see Figure 3 , the user of the working system 1 can move to the second garden. For example, the user can retract the various components in the working system onto the vehicle ( Figure 3The charging system 4 is not shown in the figure, and the charging system 4 can be installed on the vehicle), and the vehicle drives to the second garden. In the second garden, multiple gardening power tools can be used to trim the second garden. The trimming method of the second garden can be similar to the trimming method of the first garden, which will not be repeated here. The difference between the two is that during the trimming of the second garden, the power tool system 2 is powered by the second battery pack 33, 34.

[0117] After the first garden is finished and before the second garden is finished, the charging system 4 can be used to charge the first battery pack, so that the first battery pack is fully charged before the second garden is finished. In this way, the first battery pack can be used again for subsequent garden pruning work. Of course, the embodiment of the present application does not specifically limit the charging start time of the first battery pack, and the first battery pack can be charged during the driving of the vehicle. Alternatively, the charging of the first battery pack can also be started when the second garden is started.

[0118] Taking garden pruning as an example, from the perspective of a single battery pack, the charging speed and discharging speed of the battery pack system 3 by the charging system 4 mentioned above can be defined in one or more of the following ways:

[0119] When the number of battery packs in the battery pack system 3 is twice the number of battery packs required for the power tool system 2 to work, assuming that the time required for a single battery pack to be charged from an empty state to a fully charged state is t1, and the time required for a single battery pack to be discharged from a fully charged state to an empty state is t2, then the charging speed and discharging speed of the charging system 4 for the battery pack system 3 satisfy: t1≤t2;

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

[0121] When the number of battery packs in the battery pack system 3 is twice the number of battery packs required for the power tool system 2 to work, assuming that the time required for a single battery pack to be charged from an empty state to a fully charged state is t1, the time required for a single battery pack to be discharged from a fully charged state to an empty state is t2, and the time required to travel from one garden to another is t3, then the charging speed and discharging speed of the battery pack system 3 by the charging system 4 satisfy: t1≤t2+t3. t3 can be set according to actual conditions. For example, if one garden is usually close to another garden, t3 can be set to 0; if one garden is usually far away from another garden, such as an average one-hour drive, t3 can be set to 1 hour.

[0122] When the number of battery packs in the battery pack system 3 is N times the number of battery packs required for the power tool system 2 to work (N>2), assuming that the time required for a single battery pack to charge from an empty state to a fully charged state is t1, the time required for a single battery pack to discharge from a fully charged state to an empty state is t2, and the time required to travel from one garden to another is t3, then the charging speed and discharging speed of the battery pack system 3 by the charging system 4 satisfy: t1≤t2×N+t3. t3 can be set according to actual conditions. For example, if one garden is usually close to another garden, t3 can be set to 0; if one garden is usually far away from another garden, such as an average of one hour's drive, t3 can be set to 1 hour.

[0123] The foregoing describes the working system and working method provided by the present application as a whole in conjunction with Embodiment 1. It can be seen from the description of Embodiment 1 that to use the working system 1, it is necessary to configure a suitable battery pack for the working system. One possible way to configure the battery pack is to select a large-capacity battery pack already available on the market. However, as mentioned above, large-capacity battery packs on the market have many defects in terms of capacity, charge and discharge rate, and service life. The use of such battery packs may achieve uninterrupted power supply to the power tool system, but may result in lower working efficiency and higher costs for the entire working system.

[0124] The battery pack provided by the present application is described in detail below in conjunction with Example 2. It should be understood that Example 2 and Example 1 can be combined with each other. In other words, the battery pack mentioned in Example 2 can be applied to any working system or working method described in Example 1.

[0125] Embodiment 2: Battery pack

[0126] As mentioned above, the capacity of a traditional large-capacity battery pack generally does not exceed 300WH. However, 300WH of power is relatively low, and the power will soon be exhausted by the power tool, which will increase the replacement frequency of the battery pack. The high replacement frequency of the battery pack will, on the one hand, waste working time and affect work efficiency, and on the other hand, it will also shorten the service life of the battery pack. In order to alleviate this problem, an embodiment of the present application provides a battery pack with a capacity of not less than 500WH (such as 600WH).

[0127] Take garden pruning as an example. Generally speaking, the pruning time of a garden is 20 to 40 minutes. A battery pack with a capacity of not less than 500WH can basically ensure that the battery pack does not need to be replaced during the pruning process. In this way, the user can replace the battery pack on the way to another garden, so that the replacement of the battery pack will not affect the work efficiency.

[0128] As mentioned above, the number of single cells in a traditional large-capacity battery pack is generally more than 30, which will cause the weight of the battery pack to be too heavy. In the embodiment of the present application, the number of cells in the battery pack is designed to be no more than 15, and the capacity of the single cells in the battery pack is no less than 10AH, so that the weight of the battery pack can be kept from being too heavy while ensuring the capacity of the battery pack.

[0129] As an example, the capacity of the battery pack can be designed to be greater than 500WH, and the number of cells in the battery pack can be controlled within 15. This can not only avoid the battery pack being too heavy, but also to some extent avoid the need to frequently replace the battery pack due to the small capacity of the battery pack. It can be seen that this design method of the battery pack can achieve a balance between the weight and work efficiency of the battery pack.

[0130] The rated voltage (or voltage platform) of the battery pack can be designed according to the operating voltage (or voltage platform) 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 higher, for example, not less than 40V. As a specific example, the rated voltage of the battery pack can be designed to be 60V. Under the condition of a certain discharge rate, designing the rated voltage of the battery pack to be higher can increase the discharge power of the battery pack, thereby supporting the power tool to operate at a higher power.

[0131] The discharge power of the battery pack can be determined according to 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 3KW.

[0132] As mentioned above, the charging rate of the single cell of the large-capacity battery pack on the market is usually around 0.3C, and the discharge rate is generally around 1C. Such a charge and discharge rate will result in a relatively slow charging and discharging speed of the battery pack, thus affecting work efficiency.

[0133] The embodiment of the present application designs the maximum continuous charge rate and / or the maximum continuous discharge rate of the single cell in the battery pack to be no less than 3C, so as to significantly improve the charging speed / discharging speed of the battery pack. Among them, the maximum continuous charge rate refers to the maximum charge rate that the battery pack can always maintain during the continuous charging process from the empty state to the fully charged state. The maximum continuous discharge rate refers to the maximum discharge rate that the battery pack can always maintain during the continuous discharge process from the fully charged state to the empty state. That is, the battery pack can always be charged at a charge rate of no less than 3C during the continuous charging process, and the battery pack can always be discharged at a discharge rate of no less than 3C during the continuous discharge process. In this application, the empty state of the battery pack refers to the state where the SOC (state of charge) of the battery pack is less than 5% of the rated capacity of the battery pack, and the fully charged state of the battery pack refers to the state where the SOC of the battery pack is more than 95% of the rated capacity of the battery pack.

[0134] Specifically, since the smaller the internal resistance of a single cell, the higher the charge and discharge rate of the single cell, in order to increase the charge rate and / or discharge rate of the single cell, a single cell with a small internal resistance can be customized. In addition, a single cell with a small internal resistance will reduce the temperature rise of the battery pack during the charging and discharging process. As an example, the rated voltage of the battery pack can be designed to be no less than 40V, and the maximum continuous charge rate and the maximum continuous discharge rate of the battery pack can be designed to be no less than 4C. As another example, the maximum continuous charge rate and the maximum continuous discharge rate of the battery pack can also be configured to be no less than 5C. This design method can ensure that the battery pack can support high-power charging and high-power discharging. Therefore, with this design, the battery pack can be charged and discharged quickly during operation, so that the entire working system can work uninterruptedly with higher efficiency.

[0135] Furthermore, the configuration of the internal resistance of the single cells of the battery pack makes the maximum continuous charge rate of the battery pack not less than the maximum continuous discharge rate of the battery pack, so that the charging speed of the battery pack is not less than the discharge speed of the battery pack. That is, in the present application, the maximum continuous charge rate of the battery pack is not less than the maximum continuous discharge rate, and the maximum continuous charge rate and the maximum continuous discharge rate of the battery pack are not less than 3C, so that the charging capacity and discharge capacity of the battery pack are much greater than the common battery packs on the market.

[0136] As mentioned above, the maximum charge and discharge cycles of large-capacity battery packs on the market are generally within 1,000 times, and the maximum charge and discharge cycles of common large-capacity battery packs are between 300 and 500 times. A low number of charge and discharge cycles will result in a shorter life of the battery pack, which needs to be replaced frequently, which undoubtedly increases the cost of using the working system. Taking garden trimming work as an example, generally speaking, gardeners need to complete the trimming of 10-20 gardens in one day. Assuming that the gardener has prepared two sets of replaceable battery packs and replaces the battery pack after trimming each garden, a battery pack will be charged and discharged about 8 times in one day. If a large-capacity battery pack with a maximum charge and discharge cycle of 300-500 is used, a new battery pack will need to be purchased after a few months at most, which will obviously lead to a higher cost of the working system.

[0137] In order to solve the above problems, the embodiment of the present application designs the maximum charge and discharge cycle number of the single cell in the battery pack to be no less than 3000 times, preferably, the maximum charge and discharge cycle number of the single cell is no less than 5000 times, so as to ensure the service life of the battery pack. Even if a battery pack needs to complete 8-10 charge and discharge cycles a day, 5000 charge and discharge cycles can make the service life of the battery pack reach two years, thereby reducing the cost of the entire working system.

[0138] In addition, the maximum number of charge and discharge cycles of the single cells in the battery pack is designed to be no less than 5,000 times. This design is particularly important for work scenarios where the battery pack needs to be charged and discharged a high number of times in a day (such as gardeners trimming 10-20 gardens a day). There is usually no such requirement in ordinary work scenarios.

[0139] As mentioned in the first embodiment, the present application aims to enable the electric tool system to have the ability to work uninterruptedly. In order for the electric tool system to have this capability, the embodiment of the present application requires that multiple groups of battery packs be charged and discharged alternately. During the process of alternating charging and discharging of multiple groups of battery packs, if the battery packs are not temperature-controlled (or temperature-managed), two problems may arise. First, in a working scenario with a lower temperature (such as outdoors), the battery pack may be too cold, resulting in the battery pack being unable to start charging or discharging immediately. Second, during the charging and discharging process of the battery pack, the temperature of the battery pack will rise. If the temperature of the battery pack is too high and exceeds the preset temperature threshold, the charging system may need to wait until the temperature of the battery pack drops before charging the battery pack, resulting in the interruption of the charging process of the battery pack. If the above two problems occur, it may cause the electric tool system to be unable to work uninterruptedly for a period of time, thereby reducing the performance of the working system.

[0140] In order to solve this problem, in some embodiments, a heating device and / or a heat dissipation device can be configured for the battery pack. The heating device can prevent the battery pack temperature from being too low, so that the battery pack can start charging or discharging immediately even in cold weather. The heat dissipation device can avoid the problem of overheating of the battery pack to a certain extent. It can be seen that configuring a heating device and / or a heat dissipation device for the battery pack can improve the uninterrupted working performance of the power tool system to a certain extent.

[0141] Some power tools (such as handheld power tools) do not have a battery pack installation part. The power supply of such power tools can be realized by using a back frame (or a backpack device), that is, the user can use the back frame to carry the battery pack to power the power tool. The traditional back frame and the battery pack are designed as one piece, which will limit the use of the battery pack.

[0142] The embodiment of the present application 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 the back frame 5, or assembled together. Figure 4 When the battery pack is used to power a handheld power tool (such as a pruning machine 22, a grass trimmer 23, a hair dryer 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 used to power a non-handheld power tool, the battery pack is installed on the battery pack installation part of the power tool to power the non-handheld power tool. Figure 4 and Figure 6 For example, you can first follow Figure 6 Install the battery pack to the mower as shown, and then the worker can follow Figure 4 The lawn mower is pushed to perform mowing work in the manner shown.

[0143] The advantage of using a design where the battery pack and back frame are separated is that the battery pack can be installed on the power tool for operation, and can also be powered by the back frame, making the use of the battery pack more flexible.

[0144] The above text, in combination with the first embodiment, mainly describes the charging system 4 provided by the present application from the perspective of function. The following text, in combination with the third embodiment, takes the energy storage charging system 4 as an example to illustrate the structure of the charging system 4 in more detail. It should be understood that the third embodiment can be combined with the first and second embodiments. In other words, the charging system 4 mentioned in the third embodiment can be applied to any working system or working method described in the first embodiment, and can also be used in conjunction with any type of battery pack described in the second embodiment.

[0145] Example 3: Energy storage charging system

[0146] The energy storage charging system stores electrical energy (or electricity) internally. If the working system adopts 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 dispatching electricity between the energy storage charging system and the power tool system with the battery pack system as the medium. Since the amount of electricity stored in the energy storage charging system can be much larger than the amount of electricity that the battery pack system can accommodate, using the energy storage charging system to power the power tool system can meet the power supply needs of the power tool system for a longer period of time. Moreover, since the battery pack does not require much capacity, when the battery pack is installed on the power tool, it will not make the weight of the power tool too heavy. By combining the energy storage charging system and the battery pack to supply power, it is possible to achieve a balance between long battery life and light weight for the power tool system. The following is combined with Figures 7 to 12 , the structure of the energy storage charging system is illustrated in more detail.

[0147] like Figure 7 As shown, the energy storage charging system may include a power storage unit 41 , a first power conversion unit 42 and an output interface 43 .

[0148] The power storage unit 41 can be used to store power. For example, the power storage unit 41 can use an energy storage component (or energy storage medium) to store energy. The energy storage component can include, for example, one or more of the following types of energy storage components: a ternary lithium battery, a lead-acid battery, a supercapacitor, a lithium iron phosphate battery, and a hydrogen fuel cell.

[0149] 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 or in parallel, or some of the battery cells may be connected in series and some of the battery cells may be connected in parallel.

[0150] In addition to the battery cells, the power storage unit 41 may also include a battery management system to manage the battery cells. For example, the battery management system may detect the state of the battery cells to prevent the battery cells from being overcharged or over-discharged.

[0151] The embodiment of the present application does not specifically limit the amount of electricity that the power storage unit 41 can hold, and it can be configured according to actual needs. For example, the power storage unit 41 can be configured so that the amount of electricity in the power storage unit 41 can meet the power demand of the power tool system for one day of working outside. As mentioned above, the embodiment of the present application enables the power tool system to have the ability to work continuously for a long period of time. If the amount of electricity in the power storage unit 41 can meet the power demand of the power tool system for one day of working outside, then the power tool system has the ability to work continuously for one day. In this way, the user can safely use the power tool system to work outside for a day, and after work, he can use the evening time to replenish the power storage unit 41.

[0152] The specific value of the amount of electricity that the electricity storage unit 41 can hold depends on the application scenario. Figure 2 and Figure 3 Taking the garden trimming scene shown as an example, generally speaking, a gardener or garden company needs to trim 10-20 gardens a day. Therefore, the amount of electricity required to trim 10-20 gardens a day can be estimated first, and then the amount of electricity that can be stored in the electricity storage unit 41 is set to be greater than or equal to the estimated amount of electricity. Generally speaking, the amount of electricity that can be stored in the electricity storage unit 41 is set to not less than 5KWH, which can basically meet the amount of electricity required to trim 10-20 gardens. In some embodiments, the amount of electricity that can be stored in the electricity storage unit 41 can be set to 10KWH, 20KWH or 30KWH or more.

[0153] The power carried by a single battery pack is less than one eighth of the total power required by the garden team for a whole day of work, that is, the power carried by a single battery pack is less than one eighth of the power stored in the power storage unit. Since the power stored in the energy storage charging system can meet the total power demand of a commercial garden for a whole day, and the energy storage charging system can fast charge the battery pack at a charging rate of not less than 3C, a small-capacity battery pack or a small number of battery packs can continuously power the power tool system, reducing the cost of using the power tool system. At the same time, installing a small-capacity battery pack on the power tool can reduce the weight of the power tool system.

[0154] In some embodiments, the amount of electricity that the power storage unit 41 can hold can also be less than the power demand of the power tool system for one day of working outside. For example, the amount of electricity in the power storage unit 41 can be set to meet the power demand of half a day of working outside. In this way, the user can use the lunch time to recharge the power storage unit 41. Alternatively, the amount of electricity that the power storage unit 41 can hold can also be greater than the power demand of one day of working outside, so that the power storage unit 41 can be recharged every few days, without having to recharge the power storage unit 41 every day.

[0155] The power storage unit 41 may include a single cell. The charge rate and discharge rate of the single cell may be determined according to the charge and discharge speed requirements of the charging system 4. Compared with the battery pack, the power storage unit 41 has relatively low requirements for the real-time performance of charging and discharging. Therefore, in some embodiments, the charge and discharge rate of the single cell in the power storage unit 41 may be set lower, thereby reducing the cost of the cell.

[0156] As mentioned in the second embodiment, in order to support the electric tool to work at high power, the battery pack preferably has a small internal resistance to meet the higher charge and discharge rate requirements. Therefore, setting the charge and discharge rate of the single battery cell in the power storage unit 41 lower, such as setting it to be lower than the charge and discharge rate of the single battery cell in the battery pack, can make the two types of battery cells cooperate with each other, so as to make the battery cell cost of the whole system lower.

[0157] As an example, the charge rate and / or discharge rate of the single cell in the power storage unit 41 can be set to no more than 1.5C. Preferably, the charge rate of the single cell in the power storage unit 41 is no more than 1C, and the discharge rate is no more than 1.5C. For example, the charge rate of the single cell in the power storage unit 41 can be set to 1C, and the discharge rate can be set to 1.5C. Then, the amount of electricity that the power storage unit 41 can store can be set to 5KWH. In this way, a charging pile (such as an AC charging pile or a DC charging pile) can be used to charge the power storage unit 41 at a power of 5KW, so as to charge the power storage unit 41 from an empty state to a fully charged state within one hour.

[0158] 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.

[0159] Since the amount of electricity stored in the power storage unit is much greater than the amount of electricity stored in the battery pack, when the power storage unit charges the battery pack at a power of 5KW, the discharge power of the power storage unit is only 1C, and the capacity of the battery pack is much smaller than the capacity of the power storage unit. When the capacity of the battery pack is 500WH, the charging power of 5KW can support the battery pack to be quickly charged at a charging rate of 10C. Therefore, even if the discharge rate of the power storage unit is low, it can still support the battery pack to be quickly charged at a high rate. Furthermore, the cell type of the power storage unit can be different from the cell type of the battery pack. Specifically, the internal resistance of the cell of the power storage unit can be greater than the internal resistance of the cell of the battery pack, thereby reducing the cost of the power storage unit.

[0160] The first power conversion unit 42 may be electrically connected to the power storage unit 41. For example, the first power conversion unit 42 may be electrically connected to the power storage unit 41. Figure 7 The wiring harness 3 shown establishes power and communication control connection with the power storage unit 41 .

[0161] The first power conversion unit 42 can be used to convert the power stored in the power 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, which can convert the DC power output by the power 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 adopt an electrically isolated design or an electrically non-isolated design.

[0162] The output interface 43 may be electrically connected to the first power conversion unit 42. Figure 7 As shown, the output interface 43 can be electrically connected to the first power conversion unit 42 through the wiring harness 4. The output interface 43 can output the first charging power to the outside to charge the battery pack.

[0163] The output interface 43 can charge one battery pack or multiple battery packs at the same time. As mentioned above, the battery packs in the battery pack system can include multiple groups of battery packs. Assuming that the output interface 43 can support charging of N battery packs at the same time, in some embodiments, the number N can be set to be not less than the number of battery packs contained in each group of battery packs.

[0164] The output interface 43 may include one charging channel or multiple charging channels, wherein each charging channel may be used to charge a battery pack. The charging channel may charge the battery pack using direct current, and therefore, the charging channel may also be referred to as a direct current charging channel.

[0165] The embodiment of the present application does not specifically limit the connection method between the output interface 43 and the battery pack. As an example, Figure 7 As shown, the output interface 43 can provide an external wiring harness 5 (which can include wiring harnesses 5 - 1 to 5 -N) to the outside. The output interface 43 charges the battery pack through the external wiring harness 5 .

[0166] 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) through a wiring harness 5. The number of charging compartments 46 can be, for example, two. The setting of the charging compartment enables the battery pack to be easily installed in the charging system 4 for charging, and the whole process is safe and reliable. In addition, the design of the charging compartment is also conducive to saving the space occupied by the charging system 4.

[0167] A control module may be provided inside the output interface 43. The control module may be electrically connected to the power interface and the communication interface in the charging compartment 46 via the wiring harness 5, so as to perform power and communication control on the charging process of the battery pack. For example, the output interface 43 may perform one or more of the following operations with the battery pack in the charging compartment 46 via the control module: communication protocol interaction, charging process control, charging protection, etc.

[0168] A trigger interface may be provided in the charging compartment 46. The trigger interface may 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, trigger the charging system 4 to charge the battery pack.

[0169] The charging compartment 46 can charge the battery pack by wire. Alternatively, in some embodiments, the charging compartment 46 can also charge the battery pack wirelessly. Wireless charging can reduce the number of wires in the charging system 4 and reduce the weight of the charging system 4, thereby making the connection between the battery pack and the charging compartment 46 simpler.

[0170] Embodiment 2 mentions that in order to improve the charging speed of the battery pack, the battery pack can be configured with a single cell with a larger charging rate, so that the battery pack can be charged at a high rate. During the high-rate charging process, since the charging current of the battery pack is large, if the temperature of the battery pack during the charging process is not controlled, the temperature of the battery pack may be high. The high temperature of the battery pack will cause two problems. On the one hand, during the charging process, if the temperature of the battery pack exceeds the preset temperature threshold, the charging system 4 may enter the charging protection state. Once the charging protection state is entered, the charging process of the battery pack will be forced to stop. On the other hand, if the temperature of the battery pack is high after charging is completed, the battery pack may need to wait until the temperature of the battery pack drops before starting the discharge process of the battery pack. Both of the above problems may cause interruptions in the operation of the working system.

[0171] In order to avoid the above problems, a temperature control function can be added to the charging compartment 46 so that the charging compartment 46 can control the temperature of the battery pack during the charging process. For example, a heating device and / or a heat dissipation device can be provided in the charging compartment 46. The heating device and / or the heat dissipation device can dynamically control the ambient temperature of the battery pack during the charging and discharging process of the battery pack, ensuring that the battery pack can be charged continuously and that the battery pack can immediately start discharging the power tool after charging is completed.

[0172] Continue to see Figure 7 In some embodiments, the charging system 4 may further include an input interface 44. The input interface 44 may be used to receive input power (ie, power input to the charging system 4 from the outside).

[0173] The embodiment of the present application does not specifically limit the source of the input power. The input interface 44 can be used to draw power from a DC power supply and / or an AC power supply. For example, the input interface 44 can support receiving input power from one or more devices including domestic and foreign mains sockets, DC charging piles, AC charging piles, mobile power carts, and energy storage cabinets (such as large energy storage cabinets).

[0174] The input interface 44 may also include a communication control interface. The input interface 44 can perform communication control and charging protocol negotiation with an external power source through the communication control interface. For example, the communication control interface can support multiple communication protocols, so that the input interface 44 can draw power from different types of power sources, or make the input interface 44 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 analysis on a DC charging pile or an AC charging pile, so as to smoothly guide the electric energy of the charging pile to the power storage unit 41.

[0175] Continue to see 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 may be connected to the input interface 44. Figure 7 The wiring harness 1 in is electrically connected to the input interface 44 .

[0176] The second power conversion unit 45 can convert the DC power into a second charging power suitable for charging the power storage unit 41, so as to charge the power storage unit 41. For example, the second power conversion unit 45 may include a DC / DC converter. The DC / DC converter can be used to convert the DC power input by the input interface 44 into a DC power with a suitable voltage, and the DC power obtained after the conversion can be used as the above-mentioned second charging power to charge the power storage unit 41. For another example, the second power conversion unit 45 may include an AC / DC converter. The AC / DC converter can be used to convert the AC power input by the input interface 44 into a DC power, and the DC power obtained after the conversion can be used as the above-mentioned second charging power to charge the power storage unit 41. Of course, the second power conversion unit 45 can simultaneously support the conversion of DC power and AC power to the second charging power. For example, the second power converter 45 can include a DC / DC converter and an AC / DC converter at the same time.

[0177] See also Figure 8 In some embodiments, a direct charging channel (i.e. Figure 8When the input power received by the input interface 44 is DC power, the power storage unit 41 can be charged directly with DC power without passing through the second power conversion unit. The DC power can be provided by a common DC power source (such as a battery) or by a DC charging pile.

[0178] For example, some DC charging piles support direct charging modules. Therefore, when the input interface 44 receives the DC power input by such a DC charging pile, the input interface 44 can perform operations such as interface conversion, charging pile enable wake-up, and communication protocol analysis with the DC charging pile, and negotiate with the DC charging pile to use the direct charging mode for charging. After the negotiation is successful, the input interface 44 can cross the Figure 7 The second power conversion unit 45 shown in the figure leads the input power of the DC charging pile directly to the power storage unit 41 to directly charge the power storage unit 41 .

[0179] By adopting the direct charging mode, there is no need to convert the external input power, which can improve the charging efficiency of the charging system 4.

[0180] like Fig. 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 power stored in the power 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 can use the DC / AC converter to invert the DC power stored in the power storage unit 41 into one or more AC power (or AC electricity), and provide the one or more AC power to the outside through the first AC output interface 47.

[0181] The provision of the first AC output interface 47 enables the charging system 4 to be used as an emergency power supply, a backup power supply or an uninterruptible power supply (UPS), thereby expanding the function of the charging system 4 .

[0182] See also Fig.10In some embodiments, the output interface 43 may further include a second AC output interface 48. The second AC output interface 48 may be used to output the AC power to the outside when the input power of the input interface 44 is AC power. For example, when the external input through the input interface 44 is AC power (such as the input power provided by the mains or AC charging pile is AC power), 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.

[0183] In some embodiments, the second AC output interface 48 can be used to charge the battery pack through a charger or a charger. 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, so that the battery pack can be charged by the charger, so that the charging system 4 can support more battery packs to be charged at the same time. In addition, this embodiment requires that the battery pack can not only be connected to the output interface 43, but also to the charger or a charger, thereby expanding the interface types supported by the battery pack.

[0184] See also Fig.11 In some embodiments, the charging system 4 can support a battery pack reverse charging mode (see Fig.11 ). In other words, the charging device 4 can use the power of the battery pack to reversely charge the power storage unit 4. For example, the first power conversion unit 42 can convert the power stored in the battery pack into a third charging power suitable for charging the power storage unit 41. Then, the first power conversion unit 42 can use the third charging power to charge the power storage unit 41. As mentioned above, the first power conversion unit 42 may include a DC / DC converter. The DC / DC converter can convert the DC power output by the first power conversion unit 42 into a DC power suitable for charging the battery pack. In order to enable the charging system 4 to support the reverse charging mode of the battery pack, the DC / DC converter in the first power conversion unit 42 can select 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 a DC power suitable for charging the battery pack, but also convert the DC power output by the battery pack into a DC power suitable for charging the first power conversion unit 42.

[0185] As mentioned above, the charging devices currently on the market generally need to draw power from the mains socket. However, for safety reasons, the power consumption of the mains AC socket is usually limited, which makes it impossible for the charging device to charge the battery pack at high power. The charging system 4 provided in the embodiment of the present application is powered by the power storage unit 41 and is not limited by the mains socket. Therefore, in some embodiments, the charging power of the charging system 4 can be specially customized and developed so that the average charging power (or maximum charging power) of the charging system 4 is greater than the power consumption limit of the mains socket. In other words, the charging system 4 provided in the embodiment of the present application can break the mains power limit 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.

[0186] Moreover, the average charging power of the charging system 4 provided in the embodiment of the present application for the battery pack is not less than the average discharging power of the battery pack for the power tool. Specifically, the average charging power of the charging system 4 for the battery pack refers to the average charging power of a single charging compartment for a single battery pack. Among them, the average charging power is the average value of the charging power input during the effective charging time when the battery pack is charged 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 average value of the discharge power output during the effective discharging time when the battery pack is discharged 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 that the battery pack is in the charging state during the process from the empty state to the fully charged state, and the effective discharging time refers to the sum of the time that the battery pack is in the discharging state during the process from the fully charged state to the empty state. For example, if the charging process of the battery pack from an empty state to a fully charged state takes 1 hour, wherein the battery pack is charged for 20 minutes, the power is charged to Q1, rests for 20 minutes, and then charges for 20 minutes, and the power is charged from Q1 to the fully charged state Q2, then during the entire charging process, the effective charging time of the battery pack is 40 minutes. The average charging power of the battery pack from an empty state to a fully charged state should be the average of the average charging power of the battery pack in different charging time periods. In another example, when the charging process of the battery pack is a continuous process, that is, after the battery pack starts charging from an empty state, it is continuously charged to a fully charged state without pausing, then the average charging power of the battery pack is the ratio of the charging power of the battery pack to the continuous charging time. Similarly, when the battery pack is discharged from a fully charged state to an empty state for one hour, wherein the battery pack is discharged for 20 minutes, the power is discharged from Q2 to Q3, rests for 20 minutes, and then discharged for 20 minutes, the power is discharged from Q3 to an empty state, then during the entire charging process, the effective discharge time of the battery pack is 40 minutes. The average discharge power of the battery pack from a fully charged state to an empty state is the average of the average discharge power of the battery pack in different discharge periods. In another example, when the discharge process of the battery pack is a continuous process, that is, the battery pack starts to discharge from a fully charged state and then discharges continuously to an empty state without a pause, the average discharge power of the battery pack is the ratio of the discharge power of the battery pack to the continuous discharge time.

[0187] In another embodiment, the ratio of the average charging power of a single charging compartment to a single battery pack to the discharge rate of a single battery pack to a single power tool may be between 0.5 and 2. That is, the ratio of the average charging power to the average discharge power may be 0.5, 0.8, 1 or 2. In this embodiment, when the ratio of the average charging power to the average discharge power is 0.5, three battery packs may be configured for a power tool to achieve uninterrupted power supply, wherein one battery pack is used as a working battery pack and the other two battery packs are used as backup battery packs. When the ratio of the average charging power to the average discharge power is 0.8, although the average charging power is slightly smaller than the average discharge power, since the user may not use the power tool continuously but intermittently, even if the average charging power is slightly smaller than the average discharge power, the backup battery pack can still be fully charged before the working battery pack is emptied.

[0188] Preferably, the ratio of the average charging power to the average discharging power may be 1 to 2. Preferably, the ratio of the average charging power to the average discharging power may be 1 to 1.2. When the ratio of the average charging power to the average discharging power is greater than 1, even if the discharge process of the battery pack is continuous discharge, the backup battery pack can still be fully charged before the working battery pack is empty.

[0189] As an example, the average charging power of the charging system 4 for a single battery pack can be set to not less than 2.4KW. Preferably, the average charging power of the charging system for a single battery pack can be set to not 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.

[0190] Furthermore, since the average charging power of the battery pack is not less than the average discharging power, the effective charging time for charging the battery pack from an empty state to a fully charged state is not greater than the effective discharging time required for discharging the battery pack from a fully charged state to an empty state.

[0191] Furthermore, the charging system 4 can support the simultaneous charging of multiple battery packs. For example, the charging system 4 can support the simultaneous charging of two battery packs, and the total charging power of the charging system 4 per unit time can reach more than 6KW.

[0192] Embodiment 2 mentions that the charge and discharge rate of the battery pack can be set to no less than 3C. In this case, if the power of the battery pack is set to 0.6KWH and the battery pack is charged with a charging power of 3KW, the battery pack can be quickly fully charged within 20 minutes. Furthermore, if the discharge speed of the power tool is also set to 3KW, the battery pack can be discharged in as fast as 20 minutes. It can be seen that by adopting the above design, the charging speed and discharge speed of the battery pack are equal, so that uninterrupted operation of the power tool system can be achieved using two sets of battery packs.

[0193] Furthermore, when the charging rate of the battery pack is set to no less than 4C, if the power of the battery pack is set to 0.6KWH and the battery pack is charged with a charging power of 3KW, the battery pack can be quickly fully charged within 15 minutes. When the charging rate of the battery pack is set to no less than 5C, if the power of the battery pack is set to 0.6KWH and the battery pack is charged with a charging power of 3KW, the battery pack can be quickly fully charged within 12 minutes.

[0194] The charging system 4 mentioned in the embodiment of the present application can be designed as a portable charging system (or mobile charging system). The user can carry the charging system 4 with him / her and charge the battery pack anytime and anywhere.

[0195] See also Figure 7 and Fig.12 In some embodiments, Figure 7 The input interface 44 and the second power conversion unit 45 are integrated together to form a Fig.12 Alternatively, in some embodiments, the input interface and power conversion unit 44 may be Figure 7 The output interface 43 and the first power conversion unit 42 are integrated together to form a Fig.12 The output interface and power conversion module 43 shown in FIG. Of course, in some embodiments, Fig.12 The input interface and power conversion unit 44, the power storage unit 41, the output interface and the power conversion module 43 are all integrated together.

[0196] It should be noted that the foregoing mainly uses the example of wired communication between various components in the charging system 4 through a wiring harness, but the embodiments of the present application are not limited to this. Wireless communication can also be carried out between various components in the charging system 4 and between various components and the battery pack.

[0197] The above text describes in detail the working system and its components of the embodiment of the present application in combination with Embodiments 1 to 3. For ease of understanding, a specific example of the working system is given below in combination with Embodiment 4.

[0198] Embodiment 4: A specific example of a working system

[0199] like Fig.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, namely battery pack 1, battery pack 2, battery pack 3 and battery pack 4. Battery packs 1 and 2 form one group of battery packs, and battery packs 3 and 4 form another group of battery packs. In the working system, the power tool system 2 includes a plurality of garden power tools, and the plurality of garden power tools need to be powered by two battery packs when working.

[0200] In this working system, the capacity of each battery pack in the battery pack system is 0.6KWH, ​​the charging rate and discharge rate are both 5C, the rated voltage is 60V, and the maximum charge and discharge cycle number is not less than 5000 times.

[0201] The charging system 4 is a portable charging system that can be carried around. The power storage unit 41 in the charging system 4 can hold 10KWH of power. 10KWH of power can basically meet the power demand of 10-20 gardens in one day. The power storage unit 41 uses a lithium iron phosphate battery. The charging rate and discharge rate of the battery are both 1C, and the rated voltage is 48V.

[0202] The power storage unit 41 can be charged by a DC charging pile or an AC charging pile. The charging pile can provide a charging power of 10KW, so that the power storage unit 41 can be quickly charged to a full power state within one hour.

[0203] The charging system 4 includes two DC charging bays, namely, charging bay 46-1 and charging bay 46-2. The charging power of a single DC charging bay for a single battery pack is set to 3KW, so that the battery pack can be quickly charged to a full power state in 12 minutes.

[0204] The maximum operating power of garden power tools is set to 3KW. Therefore, the battery pack of the garden power tool can be discharged in as fast 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.

[0205] During the working process, the battery pack 1 and the battery pack 2 can be used to power the electric tool system 2. After the battery pack 1 and the battery pack 2 are used up, the battery pack 3 and the battery pack 4 can be used to continue to power the electric tool system 2, and the discharged battery pack 3 and the battery pack 4 can be respectively placed in the charging compartment 46-1 and the charging compartment 46-2 for charging. The above method is alternated until a day's gardening work is completed.

[0206] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power supply system, characterized in that: include: A battery pack system, comprising a plurality of battery packs, for alternately supplying power to an electric tool system, wherein the electric tool system comprises a plurality of garden-type electric tools; A portable energy storage charging system, the charging system comprising: An electric power storage unit, comprising one or more electric cells, wherein the electric cells are used to store electric power; An input interface, 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 DC power or AC power; a first power conversion unit, electrically connected to the power storage unit, and configured to perform power conversion on the power stored in the power storage unit to output a first charging power; an output interface, electrically connected to the first power conversion unit, and configured to output electric energy at the first charging power; A plurality of charging compartments, electrically connected to the output interface, the charging compartments being used to place the battery packs and to charge the battery packs using the electrical energy output by the output interface; Among them, the average charging power of a single charging compartment for a single battery pack is not less than the average discharging power of a single battery pack for the power tool, the average charging power is the charging power required within the effective charging time for charging the battery pack from an empty state to a fully charged state, and the average discharging power is the discharging power required within the effective discharging time for discharging the battery pack from a fully charged state to an empty state.

2. The power supply system according to claim 1, characterized in that: The average charging power of a single charging compartment for a single battery pack is not less than 2.4KW.

3. The power supply system according to claim 1, characterized in that: The average charging power of a single charging compartment for a single battery pack is not less than 3KW.

4. The power supply system according to claim 1, characterized in that: The effective charging time required for charging the battery pack from an empty state to a fully charged state is not greater than the effective discharging time required for discharging the battery pack from a fully charged state to an empty state.

5. The power supply system according to claim 1, characterized in that: The internal resistance of the single cells of the battery pack is configured so that the maximum continuous charge rate of the battery pack is not less than the maximum continuous discharge rate of the battery pack.

6. The power supply system according to claim 5, characterized in that: The configuration of the internal resistance of the single cells of the battery pack makes the maximum continuous charging rate and / or the maximum continuous discharge rate of the battery pack not less than 3C, and the configuration of the charging power of the battery pack by the charging bin makes the charging time of the battery pack not more than 20 minutes.

7. The power supply system according to claim 5, characterized in that: The configuration of the internal resistance of the single cells of the battery pack makes the maximum continuous charging rate and / or the maximum continuous discharge rate of the battery pack not less than 4C, and the configuration of the charging power of the battery pack by the charging bin makes the charging time of the battery pack not more than 15 minutes.

8. The power supply system according to claim 5, characterized in that: The configuration of the internal resistance of the single cells of the battery pack makes the maximum continuous charging rate and / or the maximum continuous discharge rate of the battery pack not less than 5C, and the configuration of the charging power of the battery pack by the charging bin makes the charging time of the battery pack not more than 12 minutes.

9. The power supply system according to claim 1 or 6, 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 electricity storage unit can accommodate.

10. The power supply system according to claim 9, characterized in that: The power storage unit can accommodate an amount of power not less than 5 KWH.

11. The power supply system according to claim 9, characterized in that: The capacity of the battery pack is not less than 500WH.

12. The power supply system according to claim 9, characterized in that: The capacity of the single cells in the battery pack is not less than 10AH, and the number of the single cells in the battery pack is not more than 15.

13. The power supply system according to claim 9, characterized in that: The charge rate and discharge rate of the single cells in the power storage unit are respectively smaller than the charge rate and discharge rate of the single cells in the battery pack.

14. The power supply system according to claim 13, characterized in that: The charging rate and discharging rate of the single battery cells in the power storage unit are both no greater than 1.5C.

15. The power supply system according to claim 9, characterized in that: The maximum charge and discharge cycle number of the battery pack is not less than 3000 times.

16. The power supply system according to claim 9, characterized in that: The maximum charge and discharge cycle number of the battery pack is not less than 5000 times.

17. The power supply system according to claim 1, characterized in that: The charging system further comprises: 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 power storage unit.

18. The power supply system according to claim 17, characterized in that: The input interface is used to receive the input power from one or more of the following devices: a mains socket, a DC charging pile, an AC charging pile, a mobile power supply vehicle, and an energy storage cabinet.

19. The power supply system according to claim 18, characterized in that: 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.

20. The power supply system according to claim 1, characterized in that: A direct charging channel is provided between the input interface and the power storage unit, and the direct charging channel is used to directly charge the power storage unit with the direct current power when the input power is direct current power.

21. The power supply system according to claim 1, characterized in that: The first power conversion unit is further used to convert the power stored in the battery pack into a third charging power to charge the power storage unit.

22. The power supply system according to claim 1, characterized in that: The rated power of the electric tool is greater than or equal to 1KW and less than or equal to 3KW.

23. A charging system, characterized in that: The charging system comprises: An electric power storage unit, comprising one or more electric cells, wherein the electric cells are used to store electric power; An input interface, 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 DC power or AC power; a first power conversion unit, electrically connected to the power storage unit, and configured to perform power conversion on the power stored in the power storage unit to output a first charging power; an output interface, electrically connected to the first power conversion unit, and configured to output electric energy at the first charging power; at least one charging compartment, electrically connected to the output interface, the charging compartment being used to place the battery pack and to charge the battery pack using the electrical energy output by the output interface; Among them, the average charging power of the charging compartment to the battery pack is not less than 2.4KW.

24. A working system, characterized in that: include: Power tool systems; A power supply system as claimed in any one of claims 1 to 22.

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