Electric tool system

Abstract

The utility model discloses an electric tool system. The electric tool system comprises an electric tool; the first battery pack comprises a first shell and a second shell, and the first shell comprises a first tool interface which is detachably coupled with the electric tool; the first terminal assembly is configured to be electrically connected with a terminal assembly of the electric tool; the first battery unit comprises a first positive plate containing a first positive active material and a second positive active material; the second battery pack comprises a second shell, and the second shell comprises a second tool interface which is detachably coupled with the electric tool; the second terminal assembly is configured to be electrically connected with a terminal assembly of the electric tool; the second battery unit comprises a second positive plate; the first positive electrode active material is a lithium manganese iron phosphate material, and the potential of the second positive electrode active material is higher than that of the first positive electrode active material.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and more specifically to a power tool system. Background Technology

[0002] Thanks to advancements in related technologies, after the stages of manual, fuel-powered, and AC-powered power, the power tool industry as a whole is now dominated by lithium-ion batteries. Various power tools, including handheld power tools, benchtop tools, and outdoor power equipment such as lawnmowers, can be powered by lithium-ion batteries. The charging and discharging of lithium-ion batteries is achieved through the extraction and insertion of lithium ions within the crystal lattice. Specifically, during charging, lithium ions are extracted from the positive electrode material's crystal lattice, pass through the electrolyte and separator, and insert into the negative electrode material's crystal lattice. Simultaneously, electrons travel from the external circuit to the negative electrode. Conversely, during discharging, lithium ions are extracted from the negative electrode material's crystal lattice, pass through the electrolyte and separator, and insert into the positive electrode material's crystal lattice, while electrons leave the negative electrode from the external circuit. The performance of lithium-ion batteries is significantly influenced by the positive and negative electrode materials, especially the positive electrode material.

[0003] This section provides background information related to this application, which is not necessarily prior art. Utility Model Content

[0004] One object of this application is to solve or at least alleviate some or all of the aforementioned problems. To this end, this application provides an electric tool system.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A battery cell for powering power tools includes: a negative electrode; a positive electrode, including a first positive electrode active material and a second positive electrode active material, wherein the first positive electrode active material is lithium manganese iron phosphate; a separator disposed between the positive electrode and the negative electrode; the battery cell further includes an electrode component disposed along one edge of the positive electrode, wherein the length of the electrode component is greater than or equal to one-third of the length of the edge.

[0007] In some embodiments, the battery cell is a pouch cell.

[0008] In some embodiments, the battery cell is a cylindrical cell.

[0009] In some embodiments, the rated capacity of the battery cell is greater than or equal to 1.5 Ah.

[0010] In some embodiments, the rated capacity of the battery cell is greater than or equal to 2Ah and less than or equal to 200Ah.

[0011] In some embodiments, the nominal voltage of the battery cell is greater than or equal to 3.5V and less than or equal to 4.5V.

[0012] In some embodiments, the potential of the second positive electrode active material is higher than that of the first positive electrode active material.

[0013] In some embodiments, the second positive electrode active material includes at least one of NCA, NCM, NCMA, and LMO materials.

[0014] In some embodiments, one or more battery cells are electrically connected to form a battery pack, which is used at least to power power tools.

[0015] In some embodiments, the first positive electrode active material includes nano-lithium manganese iron phosphate particles, and the first positive electrode active material and the second positive electrode active material are mixed and stirred together to manufacture a positive electrode sheet.

[0016] A battery pack for powering a power tool includes: a housing including a tool interface configured to be detachably coupled to the power tool; a terminal assembly configured to be electrically connected to the terminal assembly of the power tool; and a battery cell including a positive electrode plate comprising a first positive electrode active material and a second positive electrode active material; the first positive electrode active material being lithium manganese iron phosphate; the energy density of the battery pack being greater than or equal to 50 Wh / kg; and the capacity decay of the battery pack being less than or equal to 15% after 1,000 charge-discharge cycles at room temperature; a charge-discharge cycle is defined as the process of discharging from the full-charge voltage of the battery pack to the cutoff voltage of the battery pack, and charging from the cutoff voltage to the full-charge voltage.

[0017] In some embodiments, the potential of the second positive electrode active material is higher than that of the first positive electrode active material.

[0018] In some embodiments, the second positive electrode active material includes at least one of NCA, NCM, NCMA, and LMO materials.

[0019] In some embodiments, the battery pack has a charging rate of less than or equal to 3C and a discharging rate of less than or equal to 10C during charge-discharge cycles.

[0020] In some embodiments, the average charging current of the battery pack during charge-discharge cycles is less than or equal to 60A, and the average discharging current is less than or equal to 120A.

[0021] In some embodiments, the thickness of the housing is less than or equal to 2 mm.

[0022] In some embodiments, the distance between two battery cells within the battery pack is less than or equal to 1 mm.

[0023] In some embodiments, the battery cell is a pouch cell or a cylindrical cell.

[0024] In some embodiments, the rated capacity of the battery pack is greater than or equal to 1.5 Ah.

[0025] In some embodiments, the rated capacity of the battery pack is greater than or equal to 2Ah and less than or equal to 200Ah.

[0026] In some embodiments, the nominal voltage of the battery pack is greater than or equal to 10.8V and less than or equal to 120V.

[0027] In some embodiments, the volume of the battery pack is less than or equal to 100L.

[0028] In some embodiments, the battery pack does not have independent overcharge protection hardware.

[0029] In some embodiments, no heat insulation material is provided inside the battery pack.

[0030] An electric tool includes: a housing including a battery pack receiving section; a terminal assembly including a positive terminal, a negative terminal, and a communication terminal disposed in the battery pack receiving section and configured to be electrically connected to a first battery pack and / or a second battery pack; the first battery pack includes a first battery cell including a first positive electrode, the second battery pack includes a second battery cell including a second positive electrode; a controller configured to control the electric tool; the first positive electrode includes at least two positive electrode active materials, and the second positive electrode includes only one positive electrode active material; the controller acquires communication data through the communication terminal, identifies whether the battery pack electrically connected to the terminal assembly is the first battery pack or the second battery pack, and switches a temperature control strategy based on the identification result.

[0031] In some embodiments, the temperature control strategy includes an over-temperature protection threshold and an over-temperature duration.

[0032] In some embodiments, the first positive electrode sheet includes a first positive electrode active material and a second positive electrode active material, wherein the first positive electrode active material is lithium manganese iron phosphate.

[0033] In some embodiments, the potential of the second positive electrode active material is higher than that of the first positive electrode active material.

[0034] In some embodiments, the second positive electrode active material includes at least one of NCA, NCM, NCMA, and LMO materials.

[0035] In some embodiments, the second positive electrode sheet comprises only the second positive electrode active material.

[0036] In some embodiments, the over-temperature protection threshold in the temperature control strategy used by the controller when it identifies that the terminal assembly is electrically connected to the first battery pack is greater than the over-temperature protection threshold in the temperature control strategy used when it identifies that the terminal assembly is electrically connected to the second battery pack.

[0037] In some embodiments, the duration of overheating in the temperature control strategy used by the controller when it identifies that the terminal assembly is electrically connected to the first battery pack is greater than the duration of overheating in the temperature control strategy used when it identifies that the terminal assembly is electrically connected to the second battery pack.

[0038] A power tool system includes: a power tool, comprising: a housing including a battery pack receiving portion; a terminal assembly disposed in the battery pack receiving portion; a controller configured to control the power tool; a first battery pack, comprising: a first housing including a first tool interface configured to be detachably coupled to the battery pack receiving portion; a first terminal assembly configured to be electrically connected to a terminal assembly of the power tool; a first battery cell including a first positive electrode plate, the first positive electrode plate including a first positive electrode active material and a second positive electrode active material; a second battery pack, comprising: a second housing including a second tool interface configured to be detachably coupled to the battery pack receiving portion; a second terminal assembly configured to be electrically connected to the terminal assembly of the power tool; a second battery cell including a second positive electrode plate; wherein the first positive electrode active material is lithium manganese iron phosphate material, and the potential of the second positive electrode active material is higher than the potential of the first positive electrode active material.

[0039] In some embodiments, the second positive electrode sheet comprises only the second positive electrode active material.

[0040] In some embodiments, the second positive electrode comprises only lithium manganese iron phosphate material.

[0041] In some embodiments, the first tool interface is the same as the second tool interface.

[0042] In some embodiments, the controller of the power tool is configured with different temperature control strategies corresponding to the first battery pack and the second battery pack, respectively.

[0043] A lithium manganese iron phosphate composite cathode material includes a first cathode active material and a second cathode active material. The first cathode active material includes nano-sized lithium manganese iron phosphate particles. The potential of the second cathode active material is higher than that of the first cathode active material, and the proportion of the first cathode active material is greater than or equal to 20% and less than or equal to 80%.

[0044] In some embodiments, the second positive electrode active material is at least one of NCA, NCM, NCMA, and LMO materials.

[0045] In some embodiments, the ratio of manganese to iron in the nano-lithium manganese iron phosphate particles of the first positive electrode active material is greater than or equal to 3:7 and less than or equal to 7:3.

[0046] In some embodiments, the first positive electrode active material and the second positive electrode active material are mixed by a stirring process to realize a lithium manganese iron phosphate composite positive electrode material.

[0047] In some embodiments, lithium manganese iron phosphate cathode material is used to manufacture the cathode sheet of a battery cell in a battery pack for power tools.

[0048] In some embodiments, the potential of the first positive electrode active material is greater than or equal to 3.5V and less than or equal to 4.2V; the potential of the second positive electrode active material is greater than or equal to 3.6V and less than or equal to 4.5V.

[0049] In some embodiments, the potential of the lithium manganese iron phosphate composite cathode material is greater than or equal to 3.5V and less than or equal to 4.5V.

[0050] The technical effects of this application include at least providing a power tool system with high compatibility, good safety and excellent performance. Attached Figure Description

[0051] Figure 1 This is a schematic diagram illustrating a scenario of a power tool and a battery pack for powering the power tool, as shown in one embodiment of this application.

[0052] Figure 2 This is a perspective view of a power tool and a battery pack for powering the power tool, as shown in one embodiment of this application.

[0053] Figure 3 This is a perspective view of a power tool system illustrated in one embodiment of this application;

[0054] Figure 4 This is a perspective view of a battery pack shown in one embodiment of this application;

[0055] Figure 5 yes Figure 4 The diagram shows an exploded view of the battery pack, including the housing, tool interface, terminal assembly, and battery cells.

[0056] Figure 6 This is a perspective view of a portion of the battery pack structure shown in another embodiment of this application;

[0057] Figure 7 This is an electrical control schematic diagram of a power tool system shown in one embodiment of this application;

[0058] Figure 8 This is a schematic diagram of the electrical control principle of a power tool shown in one embodiment of this application;

[0059] Figure 9 This is a schematic diagram of the structure of a battery cell for powering power tools, as shown in one embodiment of this application;

[0060] Figure 10 This is a schematic diagram of the structure of the electrode components of a battery cell in a related art, as shown in one embodiment of this application;

[0061] Figure 11 yes Figure 9 The diagram shows the structure of the electrode components in the battery cell.

[0062] Figure 12A This is a schematic diagram showing the specific capacity of the positive electrode sheet of a battery cell made of lithium manganese iron phosphate material with different manganese iron ratios as a function of charge-discharge cycles, according to one embodiment of this application.

[0063] Figure 12B This is a schematic diagram of the charge-discharge curves of the positive electrode sheet of a battery cell made of lithium manganese iron phosphate material at different manganese iron ratios, as shown in one embodiment of this application.

[0064] Figure 13A This is a schematic diagram illustrating the capacity decay of a battery pack with a battery cell cathode sheet made of composite cathode material and single cathode material as a function of charge-discharge cycles, as shown in one embodiment of this application.

[0065] Figure 13B This is a schematic diagram of the 5C discharge curve at 25°C of a battery pack with a battery cell cathode sheet made of composite cathode material and single cathode material, as shown in one embodiment of this application.

[0066] Attached image caption:

[0067] 100. Battery pack for powering power tools; 200. Power tool; 10. Battery cell; 100a. First battery pack; 100b. Second battery pack; 11. Positive electrode; 12. Negative electrode; 13. Separator; 14. Electrolyte; 15. Electrode component; 16. Housing; 110. Housing; 111. Tool interface; 120. Terminal assembly; 210. Housing; 211. Battery pack receiving section; 220. Terminal assembly; 230. Controller. Detailed Implementation

[0068] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0069] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0070] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0071] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0072] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0073] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0074] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0075] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. When using the unit "controller," "processor," "central processing unit," "CPU," or "MCU" to perform a specific function, unless otherwise stated, these functions may be performed by a single or multiple of the aforementioned units.

[0076] In this application, the terms "device," "module," or "unit" are used to describe devices that can be implemented in hardware or software to perform a specific function.

[0077] In this application, the terms “calculation,” “judgment,” “control,” “determine,” “identify,” etc., refer to the operation and process of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0078] Thanks to technological advancements, the promotion of environmental protection concepts, and policy support, the power tool industry has continued to expand. After experiencing manual, fuel-powered, and AC-powered stages, the entire sector is now showing a trend towards lithium-ion battery technology and intelligent operation. Various power tools, including handheld power tools, benchtop tools, and outdoor power equipment such as lawnmowers and snowplows, can now be powered by lithium batteries.

[0079] Lithium-ion batteries are a type of relatively ideal reversible battery. Their charging and discharging process is achieved through the extraction and insertion of lithium ions into the crystal lattices of the positive and negative electrode materials. Specifically, during charging, lithium ions are extracted from the crystal lattice of the positive electrode material, pass through the electrolyte and separator between the positive and negative electrode plates, and insert into the crystal lattice of the negative electrode material. At the same time, electrons also reach the negative electrode from the external circuit. Conversely, during discharging, lithium ions are extracted from the crystal lattice of the negative electrode material, pass through the electrolyte and separator, and insert into the crystal lattice of the positive electrode material. Electrons leave the negative electrode from the external circuit.

[0080] The negative electrode material of lithium batteries generally uses carbon materials such as graphite, and in some cases, other non-carbon materials are also used. The choice of positive electrode material is relatively diverse. Typically, positive and negative electrode materials also include binders and conductive agents. After mixing, the positive and negative electrode materials are coated onto aluminum foil and copper foil respectively, and then dried and rolled to form positive and negative electrode sheets. The positive electrode sheets, separator, and negative electrode sheets are then wound or folded to form a single battery cell. The performance of lithium batteries is significantly affected by their positive and negative electrode materials, especially the positive electrode material. Of course, the above is only a simple explanation of the relevant principles of lithium batteries; in practice, much more complex technologies are involved.

[0081] Currently, the mainstream cathode material for lithium batteries used in power tools is "ternary lithium," namely NCM (lithium nickel cobalt manganese oxide) or NCA (lithium nickel cobalt aluminum oxide), which are polymers of multiple elements such as nickel, cobalt, and manganese. One advantage of ternary polymer lithium batteries is that lithium batteries with cathode sheets made from this material generally have higher energy density, storing more energy in the same volume / weight. However, they also have some significant disadvantages, including relatively poor safety and environmental friendliness, and a relatively short lifespan. Therefore, this application aims to improve the cathode material for lithium batteries used in power tools to meet the needs of the power tool industry, as detailed below.

[0082] First, a lithium manganese iron phosphate composite cathode material is introduced. This cathode material includes at least a first cathode active material and a second cathode active material. The first cathode active material comprises nano-sized lithium manganese iron phosphate particles, while the second cathode active material is a material with a higher potential than the first cathode active material. The proportion of the first cathode active material in the composite cathode material is greater than or equal to 20% and less than or equal to 80%. The potential of the cathode active material characterizes its ability to provide a potential and is positively correlated with the free enthalpy of lithium-ion exchange reaction under that material. In some embodiments, the potential of the cathode active material can be its lithium-reactive potential. In some embodiments, the potential of the cathode active material can be the full-charge voltage or charging termination voltage of a single-cell battery cell using only this material to make the cathode sheet. In some embodiments, the potential of the first cathode active material is greater than or equal to 3.5V and less than or equal to 4.2V, and the potential of the second cathode active material is greater than or equal to 3.6V and less than or equal to 4.5V. In some embodiments, the potential of the composite cathode material is greater than or equal to 3.5V and less than or equal to 4.5V. In some cases, the lithium battery industry also classifies cell material systems based on the positive electrode active material. The aforementioned second positive electrode active material belongs to the "high" potential material system.

[0083] In some embodiments, the second positive electrode active material can be an NCM (lithium nickel cobalt manganese oxide) material or an NCA (lithium nickel cobalt aluminum oxide) material, i.e., a ternary material; in some embodiments, the second positive electrode active material can be an NCMA (lithium nickel cobalt manganese aluminum oxide) material, i.e., a quaternary material; in some embodiments, the second positive electrode active material can also be a unary material such as an LMO (lithium manganese oxide) material. In some embodiments, the second positive electrode active material can be a mixture of multiple positive electrode active materials with a higher potential than the first positive electrode active material, for example, it can be multiple of the above-mentioned NCA, NCM, NCMA, and LMO materials.

[0084] In the above-described embodiments, the first positive electrode active material, namely lithium manganese iron phosphate, has the advantages of high safety, long service life, and no heavy metal content, but its energy density is relatively low. The second positive electrode active material, with a higher potential than lithium manganese iron phosphate, generally has high energy density but low safety / service life. This composite positive electrode material achieves a balance between high energy density and high safety / service life by mixing the two positive electrode active materials, adjusting the ratio of the first and second positive electrode active materials to comprehensively meet the performance requirements of lithium batteries for power tools.

[0085] In some embodiments, the proportion of the first positive electrode active material in the composite positive electrode material is greater than or equal to 20% and less than or equal to 80%. Alternatively, the ratio of the proportion of the first positive electrode active material to the proportion of the second positive electrode active material in the composite positive electrode material is greater than or equal to 2:8 and less than or equal to 8:2. Preferably, the proportion of the first positive electrode active material in the composite positive electrode material is greater than or equal to 40% and less than or equal to 80%. Alternatively, the ratio of the proportion of the first positive electrode active material to the proportion of the second positive electrode active material in the composite positive electrode material is greater than or equal to 4:6 and less than or equal to 8:2. Further, the proportion of the first positive electrode active material in the composite positive electrode material is greater than or equal to 40% and less than or equal to 60%. Alternatively, the ratio of the proportion of the first positive electrode active material to the proportion of the second positive electrode active material in the composite positive electrode material is greater than or equal to 4:6 and less than or equal to 6:4.

[0086] In some embodiments, the first and second positive electrode active materials are mixed and stirred to form the lithium manganese iron phosphate composite positive electrode material. In some embodiments, a conventional stirring process can be used to mix single-crystal ternary materials and nano-sized lithium manganese iron phosphate materials, with the nano-sized lithium manganese iron phosphate particles filling the spaces between the ternary material particles. In some embodiments, a conventional stirring process can be used to mix single-crystal ternary materials, nano-sized lithium manganese iron phosphate materials, and lithium manganese oxide materials. Medium-sized ternary material particles can fill the spaces between large-sized lithium manganese oxide particles, while small-sized nano-sized lithium manganese iron phosphate particles can fill the spaces between medium-sized ternary material particles, thereby achieving a simple and easy way to improve the volumetric energy density and compaction density of the composite positive electrode material.

[0087] Regarding the first positive electrode active material, namely lithium manganese iron phosphate (LFP), it should be noted that LFP is a relatively stable electrochemical material, and some power tool battery packs also use a single LFP material to make the positive electrode of the battery cell. To meet the high power requirements of most power tools, and considering that lithium manganese phosphate and lithium iron phosphate have similar olivine crystal structures and can easily achieve solid solutions with a wide range of proportions, this application optimizes the LFP material by doping it with Mn to leverage the synergistic effect of Mn and Fe, resulting in an LMFP material that balances high stability and high energy density.

[0088] Specifically, if the Mn content in the LMFP material is too low, the material potential increase will be small, and the energy density cannot be significantly improved. If the Mn content in the LMFP material is too high, it is easy to promote the Jan Taylor effect, leading to lattice distortion. Mn may precipitate and react with the electrolyte, thereby affecting the material stability. In addition, another factor restricts the Mn to Fe ratio in the LMFP material, as referenced... Figure 12A and Figure 12B When LMFP material is used as the positive electrode of a battery cell, the discharge curve of the cell exhibits a flat voltage plateau. This plateau affects the cell's SOC (State of Charge) identification and interferes with related control. Therefore, it is necessary to select a suitable Mn / Fe ratio to keep the above-mentioned effects within a controllable range. In some embodiments, the manganese-iron ratio in the LMFP material is greater than or equal to 3:7 and less than or equal to 7:3. Preferably, the manganese-iron ratio in the LMFP material is greater than or equal to 5:5 and less than or equal to 6:4. In a preferred embodiment, the manganese-iron ratio in the LMFP material is 6:4.

[0089] To clarify the concept of this application, Table 1 is used as a reference to explain and compare the energy density, cycle life, high and low temperature performance of LFP materials, LMFP materials, and ternary materials. Although the values ​​in Table 1 are only used for illustrative purposes, the relationship between the parameter values ​​of the materials is certain.

[0090]

[0091] Table 1

[0092] In the above embodiments, for the mixing of the second positive electrode active material with the first positive electrode active material, while leveraging the energy density advantage of the second positive electrode active material, the first positive electrode active material is used to mitigate its poor safety and stability issues, and improve its service life. For the mixing of the first positive electrode active material with the second positive electrode active material, while leveraging the safety and service life advantages of the first positive electrode active material, the second positive electrode active material is used to improve its energy density, lithium-ion diffusion rate, conductivity, compaction density, and low-temperature performance.

[0093] Following the preceding text, this application focuses on an improved cathode material solution for battery packs used in lithium-ion electric tools. However, the aforementioned lithium manganese iron phosphate composite cathode material can also be applied to battery cells or battery packs for other applications. It is itself a cathode material with excellent overall performance and may also produce improvement effects in other scenarios. Returning to the scenario primarily described in this application—the electric tool 200 and the battery cell 10 and battery pack 100 used to power the electric tool 200—further explanations will be provided regarding the battery cell 10, battery pack 100, and the electric tool 200 using the aforementioned lithium manganese iron phosphate composite cathode material.

[0094] refer to Figure 1 The power tool 200 described in this application may include various different types of power tools 200, such as Figure 1The illustrated power tools 200 include a ride-on lawnmower 200a, a drill 200b, a chainsaw 200c, a lawn mower 200d, a blower 200e, and an all-terrain vehicle 200f. The battery unit 10 and battery pack 100, described later, power the power tools 200. In some embodiments, the power tools 200 can be handheld tools such as circular saws, reciprocating saws, drills, and screwdrivers. In some embodiments, the power tools 200 can be table saws such as table saws and miter saws. In some embodiments, the power tools 200 can be outdoor power equipment such as lawnmowers and snowplows. In some embodiments, the power tools 200 can be robotic tools such as lawnmower robots and snowplow robots. In some embodiments, the power tools 200 can be push-type tools such as push lawnmowers and push snowplows. In some embodiments, the power tools 200 can be vehicles such as multi-purpose all-terrain vehicles (UTVs / farm vehicles), all-terrain vehicles (ATVs / ATVs), and golf carts. In some embodiments, the power tool 200 can be an outdoor wheeled tool or an outdoor electric vehicle, etc. In some embodiments, the power tool 200 can be a decorating tool such as an angle grinder or impact wrench used in construction projects, etc. In some embodiments, the power tool 200 can be a gardening tool such as a pruning machine or lawnmower used in landscaping and horticulture, etc. In some embodiments, the power tool 200 can be a cleaning tool such as a hair dryer or a washer. In some embodiments, the power tool 200 can be a cutting tool such as a chainsaw or a jigsaw. In some embodiments, the power tool 200 can be a drilling tool such as an electric drill, a hammer drill, or a screwdriver. In some embodiments, the power tool 200 can be a grinding tool such as an angle grinder or a sander. Alternatively, the power tool 200 can also be other tools, such as a lamp or a fan. It is understood that some electrical devices not shown above may also be included in the scope of the power tool 200 described in this application.

[0095] The aforementioned power tool 200 is powered by a battery pack 100 and has a battery pack receiving section 211 that can be installed and removed from the battery pack 100. The specific structure and location of the battery pack receiving section 211 may vary between different power tools 200. The battery pack receiving section 211 is generally located in the housing 210 of the power tool 200 and may be closed, semi-closed, or exposed.

[0096] refer to Figures 2 to 8The power tool 200, in addition to a housing 210 and a battery pack receiving section 211 disposed in the housing 210, also includes a terminal assembly 220 disposed in the battery pack receiving section 211 and a controller 230 disposed within the housing 210. The terminal assembly 220 of the power tool 200 can interface with the terminal assembly 120 of the battery pack 100 via a male-female interface or similar method. Both terminal assemblies can include positive and negative terminals for transmitting electrical energy, and communication terminals for transmitting communication data. The controller 230 can run relevant control programs to control the execution of various functions of the power tool 200. Commonly, the power tool 200 also includes functional components such as blades, grinding discs, and drill bits that perform actual work. In some embodiments, it also includes transmission components such as gears and shafts; in some embodiments, it also includes a motor for driving the aforementioned functional components or other components.

[0097] refer to Figures 2 to 11 This application provides a battery unit 10 for powering the power tool 200 described above. The battery unit 10 can be a core component of the battery pack 100. In some embodiments, the battery unit 10 is a single battery cell. One or more single battery cells can be electrically connected in series and / or parallel to form a battery pack 100 for powering the power tool 200.

[0098] The battery cell 10 includes a positive electrode 11, a negative electrode 12, and a separator 13. The positive electrode 11 is coated with a positive electrode material, the negative electrode 12 is coated with a negative electrode material, and the separator 13 is disposed between the positive electrode 11 and the negative electrode 12. An electrolyte 14 is filled between the positive and negative electrode 11 and 12, allowing lithium ions to transfer between the positive and negative electrode materials through the separator 13 in the electrolyte 14. The battery cell 10 also has a housing 16. In some embodiments, the positive electrode 11, separator 13, and negative electrode 12 are wound to form the battery cell 10, which can be a cylindrical cell or a wound cell. In some embodiments, the battery cell 10 is a pouch cell, and the positive electrode 11, separator 13, and negative electrode 12 can be folded to form the battery cell 10. In some embodiments, the battery cell 10 can also be a prismatic cell. In some embodiments, the negative electrode material is graphite. In some embodiments, the electrolyte 14 is one or more of organic solutes, solid electrolytes, lithium salt liquid electrolytes, and polymer electrolytes.

[0099] In this embodiment, the positive electrode 11 includes a first positive electrode active material and a second positive electrode active material, that is, the positive electrode 11 is made of a composite positive electrode material, wherein the first positive electrode active material is lithium manganese iron phosphate. Simultaneously, the battery cell 10 also includes an electrode component 15, which is disposed along one side edge of the positive electrode 11 and has a length greater than or equal to one-third of the edge length. Preferably, the length of the electrode component 15 is greater than or equal to two-thirds of the edge length of the positive electrode 11. Specifically, the electrode component 15 is used to achieve current extraction and is sometimes referred to as a tab; the positive electrode 11 generally has a main rectangular plane, and the electrode component 15 can be disposed on one side edge corresponding to the long side of the rectangular plane of the positive electrode 11, so that the current reaches the electrode component 15 along a shorter path, or the electrode component 15 can also be adaptively disposed on any edge of the positive electrode 11. Similarly, an electrode component 15 can also be disposed on one side edge of the negative electrode 12, and its length is also greater than or equal to one-third of the edge length of the negative electrode 12. Figure 9 As shown, the number of electrode components 15 can be one or more. These one or more electrode components 15 can be continuously arranged along the entire length of one side edge of the positive electrode sheet 11. For example, multiple electrode components 15 can be spaced apart along the long edge of the positive electrode sheet 11. The length of each electrode component 15 is its total length along the edge of the positive electrode sheet 11, and in the case of multiple electrode components 15, it is the sum of the lengths of each electrode component 15 along that edge direction. In the above embodiment, the positive electrode sheet 11 of the battery cell 10 is first realized using a positive electrode material achieved by combining the first and second positive electrode active materials. This improves upon the weakness of insufficient energy density while maintaining the original advantages of safety and stability of lithium manganese iron phosphate material. Furthermore, the arrangement of electrode components 15 with a length exceeding one-third of the edge length of the positive electrode sheet 11 significantly reduces electrical contact loss from the cell to the external circuit, further optimizing the output performance of the battery cell 10 and compensating for related deficiencies.

[0100] In some embodiments, the second positive electrode active material has a higher potential than the first positive electrode active material, i.e., an LMFP material. Using a single second positive electrode active material to manufacture the positive electrode sheet 11 will result in a battery cell 10 with high energy density, low safety, and short lifespan. In some embodiments, the second positive electrode active material includes, but is not limited to, NCA, NCM, NCMA, and LMO materials, and may be one or more of these. In some embodiments, the first positive electrode active material is nano-lithium manganese iron phosphate particles, which can be mixed and stirred with the second positive electrode active material to manufacture the positive electrode sheet 11 of the battery cell 10.

[0101] In some embodiments, the battery cell 10, which uses a composite positive electrode material composed of the first and second positive electrode active materials, is adapted to the design requirements of powering the various power tools 200 described above, and has a rated capacity greater than or equal to 1.5 Ah. Preferably, the rated capacity of the battery cell 10 is greater than or equal to 2 Ah and less than or equal to 200 Ah. In some embodiments, the nominal voltage of the battery cell 10 used to power the power tool 200 is greater than or equal to 3.5V and less than or equal to 4.5V. Preferably, the nominal voltage of the battery cell 10 is greater than or equal to 3.6V and less than or equal to 4.5V. In some embodiments, the continuous discharge current of the battery cell 10 used to power the power tool 200 is greater than or equal to 1A and less than or equal to 200A, wherein the continuous discharge current is a non-instantaneous current. Alternatively, preferably, the average discharge current of the battery cell 10 is greater than or equal to 2A and less than or equal to 50A.

[0102] Following on from the previous text, see reference. Figures 4 to 6This application provides a battery pack 100 for powering the aforementioned power tool 200. The battery pack 100 may include a housing 110 and a tool interface 111 disposed on the housing 110, and also includes a terminal assembly 120. The tool interface 111 is coupled to the battery pack receiving portion 211 on the housing 210 of the power tool 200 to achieve a detachable connection between the two. The terminal assembly 120 of the battery pack 100 is configured to be electrically connected to the terminal assembly 220 of the power tool 200 for power and data transmission. The battery pack 100 for powering the power tool 200 also includes battery cells 10, which may be cylindrical cells, pouch cells, or prismatic cells. The number of battery cells 10 may be one or more, and they may be connected in series and / or in parallel. They may be housed within the housing 110 of the battery pack 100. As described above, the battery cell 10 may be composed of a positive electrode 11, a negative electrode 12, a separator 13, an electrolyte 14, and a casing 16. In some cases, the all-tab battery cell also includes an electrode component 15. The positive electrode 11 includes first and second positive electrode active materials, and the first positive electrode active material is lithium manganese iron phosphate. In this embodiment, using the above-mentioned composite positive electrode material, the energy density of the battery pack 100 used to power the power tool 200 is greater than or equal to 50 Wh / kg, and the capacity decay after 1000 charge-discharge cycles at room temperature is less than or equal to 15%. Optionally, in some embodiments, the energy density of the battery pack 100 used to power the power tool 200 is greater than or equal to 100 Wh / kg. Preferably, in some embodiments, the energy density of the battery pack 100 used to power the power tool 200 is greater than or equal to 200 Wh / kg, and the capacity decay after 1000 charge-discharge cycles at room temperature is less than or equal to 10%. In some embodiments, the energy density of the battery pack 100 used to power the power tool 200 is greater than or equal to 220Wh / kg.

[0103] The battery pack 100 is subjected to charge-discharge cycles at room temperature to assess its capacity decay. This environment generally refers to room temperature (23±2℃) and relative humidity (55±20%). A charge-discharge cycle is defined as the battery pack 100 discharging from full voltage to cutoff voltage and then charging from cutoff voltage to full voltage. The full voltage of the battery pack 100 is generally defined as its charging termination voltage, at which point the battery pack SOC reaches its "maximum value". The cutoff voltage of the battery pack 100 is generally defined as its discharging termination voltage, at which point the battery pack SOC can approach its "minimum value". In other words, the above charge-discharge cycle is 100% DoD. In some embodiments, during the above-mentioned charge-discharge cycle, the charging rate of the battery pack 100 can be less than or equal to 3C, and the discharging rate can be less than or equal to 10C. That is, the capacity decay of the battery pack 100 containing the positive electrode sheet 11 made of composite positive electrode material for powering the power tool 200 after performing thousands of charge-discharge cycles of 3C charging and 10C discharging is less than or equal to 15%. In other words, in the scenario of performing a charging rate of less than 3C and a discharging rate of greater than 10C, the number of charge-discharge cycles that the battery pack 100 for the power tool 200 can undergo to decrease its capacity by 15% exceeds thousands of cycles. However, in the conventional charge-discharge scenario, the capacity decay of the battery pack 100 for the power tool 200 after thousands of charge-discharge cycles is much less than 15%, and the number of charge-discharge cycles that the capacity can undergo to decrease its capacity by 15% far exceeds thousands of cycles.

[0104] In some embodiments, the second positive electrode active material has a higher potential than the first positive electrode active material, i.e., an LMFP material. Using a single second positive electrode active material to manufacture the positive electrode sheet 11 will result in a battery cell 10 with high energy density, low safety, and short lifespan. In some embodiments, the second positive electrode active material includes, but is not limited to, NCA, NCM, NCMA, and LMO materials, and may be one or more of these. In some embodiments, the first positive electrode active material is nano-lithium manganese iron phosphate particles, which can be mixed and stirred with the second positive electrode active material to manufacture the positive electrode sheet 11 of the battery cell 10.

[0105] In some embodiments, the battery pack 100, which uses a composite positive electrode material composed of the first and second positive electrode active materials as the positive electrode sheet 11, is adapted to the design requirements of powering the various power tools 200 described above. During charge-discharge cycles, the average charging current is less than or equal to 3C, and the average discharging current is less than or equal to 10C. Preferably, the average charging current of the battery pack 100 during charge-discharge cycles is less than or equal to 2C, and the average discharging current is less than or equal to 5C. In some embodiments, the rated capacity of the battery pack 100 for powering the power tool 200 is greater than or equal to 1.5Ah. Preferably, the rated capacity of the battery pack 100 is greater than or equal to 2.0Ah and less than or equal to 200Ah. In some embodiments, the nominal voltage of the battery pack 100 for powering the power tool 200 is greater than or equal to 10.8V and less than or equal to 120V. More preferably, the nominal voltage of the battery pack 100 is greater than or equal to 10.8V and less than or equal to 80V. Preferably, the nominal voltage of the battery pack 100 is greater than or equal to 18V and less than or equal to 56V.

[0106] In some embodiments, the battery pack 100, which uses a composite positive electrode material composed of the first and second positive electrode active materials described above, is adapted to the design requirements of powering the various power tools 200 described above. Its volume is less than or equal to 100L, and / or its weight is less than or equal to 100kg. The volume of the battery pack 100 can be considered as a right parallelepiped calculated in terms of length, width, and height. Optionally, the volume of the battery pack 100 is less than or equal to 40L; more preferably, the volume of the battery pack 100 is less than or equal to 4.8L. Preferably, the volume of the battery pack 100 is less than or equal to 1.2L, and / or its weight is less than or equal to 2.8kg. In some embodiments, the thickness of the housing 110 of the battery pack 100 powering the power tool 200 is less than or equal to 2.0mm. The thickness of the housing 110 of the battery pack 100 can be the average thickness or the maximum thickness of the housing 110. Preferably, the thickness of the housing 110 of the battery pack 100 is less than or equal to 1.5mm. In some embodiments, the distance between two battery cells 10 in the battery pack 100 used to power the power tool 200 is less than or equal to 1.5 mm, wherein the distance between the two battery cells 10 can be the minimum distance between the housings of the two battery cells 10. Preferably, the distance between the two battery cells 10 in the battery pack 100 is less than or equal to 1.0 mm. The above embodiments can further optimize the energy density, compact structure, and portability of the battery pack 100 for the power tool 200.

[0107] In some embodiments, the battery pack 100, which uses a composite positive electrode material composed of the first and second positive electrode active materials as the positive electrode sheet 11, can effectively leverage the high safety and high stability advantages of lithium manganese iron phosphate material, eliminating the need for heat insulation materials and / or independent overcharge protection hardware. In related technologies, considering the poor safety of ternary materials such as NCM, to mitigate thermal runaway and heat propagation, the battery pack 100 for power tools 200 typically incorporates heat insulation materials such as flame-retardant foam, mica sheets, and aerogel felt, arranged between battery cells 10 for heat insulation and flame retardancy. Furthermore, to prevent combustion and explosion caused by overcharging, the battery pack 100 for power tools 200 generally includes independent overcharge protection hardware, such as an independent overcharge fuse, in addition to setting a control program to limit overcharging at the software level. This hardware will forcibly terminate charging of the battery pack 100 when the voltage exceeds the upper limit. In the above-described implementation, due to the addition of lithium manganese iron phosphate material in the composite cathode material, the probability of thermal runaway and thermal propagation in the battery pack 100 is significantly reduced. Not setting up heat insulation material and / or independent overcharge protection hardware is more conducive to optimizing the cost, structure, and performance of the battery pack 100.

[0108] Regarding the performance of the various embodiments of the battery cell 10 and battery pack 100 for powering the power tool 200 described above, it should also be noted that... Figure 13A , Figure 13B For example, under the same conditions, the rate discharge curve of the positive electrode sheet made of composite positive electrode material containing the first and second positive electrode active materials is better than that of the positive electrode sheet made of single lithium manganese phosphate / lithium iron phosphate / lithium manganese iron phosphate in the battery pack or battery cell for power tools; the capacity decay curve of the positive electrode sheet made of composite positive electrode material is better than that of the positive electrode sheet made of ternary or quaternary materials; the battery pack or battery cell made of composite positive electrode material successfully passed the overcharge test, the 150°C hot box test (heated to the test temperature at a rate of +5°C / min and then left to stand for 30min) and the nail penetration test (a 5mm±1mm steel nail is driven into the cell at 20mm / s) when the positive electrode sheet made of ternary or quaternary materials is used, while the battery pack or battery cell catches fire in the overcharge test, the 140°C hot box test and the nail penetration test.

[0109] Following on from the previous text, considering the compatibility issues between the power tool 200 and different battery packs 100, refer to... Figures 1 to 3 This application also proposes a power tool 200 and a power tool system. The power tool system includes a power tool 200 and a first battery pack 100a and a second battery pack 100b. The power tool 200 is adapted to the first battery pack 100a and / or the second battery pack 100b to meet the iterative and compatible use of two types of battery packs: one using ternary materials to manufacture the positive electrode 11 and the other using composite positive electrode materials to manufacture the positive electrode 11.

[0110] The aforementioned power tool 200 can be any type of power tool 200 described above, including a housing 210, a battery pack receiving section 211 disposed in the housing 210, and a terminal assembly 220 disposed in the battery pack receiving section 211. The battery pack receiving section 211 can be coupled to the tool interface of the first battery pack 100a and / or the second battery pack 100b, and the terminal assembly 220 of the power tool 200 can also be electrically connected to the terminal assembly 120 of the first battery pack 100a and / or the second battery pack 100b. The first battery pack 100a includes a first housing 110 and a first tool interface 111 on the first housing 110 that can be coupled to a battery pack receiving portion 211 on the housing 210 of the power tool 200. It also includes a first terminal assembly 120 that can be electrically connected to a terminal assembly 220 of the power tool 200, and one or more first battery cells 10 housed within the first housing 110. Each first battery cell 10 includes a first positive electrode 11, which comprises at least two positive electrode active materials. The second battery pack 100b includes a second housing 110 and a second tool interface 111 on the second housing 110 that can be coupled to a battery pack receiving portion 211 on the housing 210 of the power tool 200. It also includes a second terminal assembly 120 that can be electrically connected to the terminal assembly 220 of the power tool 200, and one or more second battery cells 10 housed within the second housing 110. Each second battery cell 10 includes a second positive electrode 11, which comprises only a single positive electrode active material. In some embodiments, the difference between the first battery pack 100 and the second battery pack 100 may only be in the battery cells 10, and they may appear identical or similar from the outside. In some embodiments, the power tool 200 is powered by only a single battery pack 100, that is, the power tool 200 is powered by either the first battery pack 100a or the second battery pack 100b. In some embodiments, the power tool 200 may also be powered by both the first battery pack 100a and the second battery pack 100b simultaneously, and its battery pack receiving part 211 may couple both battery packs simultaneously, and its terminal assembly 220 may also include terminals capable of mating with the terminal assemblies of both battery packs.

[0111] In this embodiment, the power tool 200 is also equipped with a controller 230. The controller 230 can acquire communication data from the battery pack 100 through a communication terminal, thereby identifying the battery pack 100 currently electrically connected to the terminal assembly 220 of the power tool 200, and switching the corresponding temperature control strategy based on the identification result for more accurate battery thermal management. Specifically, when an electrical connection with the first battery pack 100a is identified, the controller 230 of the power tool 200 can execute a first temperature control strategy, while when an electrical connection with the second battery pack 100b is identified, the controller 230 of the power tool 200 can execute a second temperature control strategy. In some embodiments, the communication data exchanged between the battery pack 100 and the power tool 200 through the terminal assembly 220 carries information such as the version and model of the battery pack 100 and its electrical parameters. In some embodiments, the temperature control strategy to be executed by the controller 230 of the power tool 200 includes an over-temperature protection threshold and an over-temperature duration. The over-temperature protection threshold and / or over-temperature duration in the first and second temperature control strategies are different. The temperature protection threshold is used to compare with the sampled temperature at the temperature measurement point inside the battery pack 100 to determine whether the electrically connected battery pack 100 is currently overheated. The duration of overheating is used to determine the timing for terminating charging and discharging. For example, the controller 230 can terminate the charging and discharging of the electrically connected battery pack 100 after tolerating the duration of overheating from the sampled temperature exceeding the overheat protection threshold.

[0112] In some embodiments, the first positive electrode 11 of the first battery pack 100a is coated with a composite positive electrode material containing first and second positive electrode active materials, wherein the first positive electrode active material is lithium manganese iron phosphate. In some embodiments, the second positive electrode active material is a material with a higher potential than the first positive electrode active material, specifically including but not limited to one or more of NCA, NCM, NCMA and LMO materials.

[0113] In some embodiments, the second positive electrode 11 of the second battery pack 100b may be made of only the first positive electrode active material, i.e., only lithium manganese iron phosphate material; or, the second positive electrode 11 may be made of only the second positive electrode active material, such as ternary materials such as NCA material and NCM material.

[0114] In some embodiments, when the first positive electrode 11 reuses an LMFP material and a second positive electrode active material with a potential higher than that of the LMFP material, while the second positive electrode 11 uses only a single second positive electrode active material, the over-temperature protection threshold in the first temperature control strategy executed by the controller 230 when it identifies a current electrical connection to the first battery pack 100a is greater than the over-temperature protection threshold in the second temperature control strategy executed when it identifies a current electrical connection to the second battery pack 100b; and / or, the over-temperature duration in the first temperature control strategy is greater than the over-temperature duration in the second temperature control strategy. Understandably, the temperature control strategy executed by the power tool 200 controller 230 can be more complex and varied. However, generally speaking, adapting to the characteristic differences between the first and second positive electrode sheets 11 or the first and second battery packs 100a and 100b caused by the aforementioned first and second positive electrode active materials, the first temperature control strategy executed by the power tool 200 controller 230 when it identifies the current electrical connection to the first battery pack 100a can be more tolerant of related abnormal conditions than the second temperature control strategy executed when it identifies the current electrical connection to the second battery pack 100b.

[0115] It should be noted that the various implementation methods and their specific embodiments described above can be combined with each other to comprehensively optimize the battery positive electrode / composite positive electrode material, battery cell, battery pack, power tool or power tool system in this application, provided that the characteristics do not conflict.

[0116] The technical effects of this application include at least providing a battery cell, battery pack, and related power tools and power tool systems that have better overall performance, taking into account energy density, safety, stability, and adaptability to the power supply needs of power tools.

[0117] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A power tool system, comprising: Power tools, including: The casing, including the battery pack receiver; A terminal assembly is disposed in the battery pack receiving section; Controller, configured to control the power tool; The first battery pack includes: A first housing includes a first tool interface configured to be detachably coupled to the battery pack receiving section; A first terminal assembly is configured to be electrically connected to the terminal assembly of the power tool; The first battery cell includes a first positive electrode sheet, wherein the first positive electrode sheet includes a first positive electrode active material and a second positive electrode active material; The second battery pack includes: The second housing includes a second tool interface configured to be detachably coupled to the battery pack receiving section; The second terminal assembly is configured to be electrically connected to the terminal assembly of the power tool; The second battery cell includes a second positive electrode plate; The first positive electrode active material is lithium manganese iron phosphate, and the potential of the second positive electrode active material is higher than that of the first positive electrode active material.

2. The power tool system according to claim 1, characterized in that, The second positive electrode sheet includes only the second positive electrode active material.

3. The power tool system according to claim 1, characterized in that, The second positive electrode consists only of lithium manganese iron phosphate material.

4. The power tool system according to claim 1, characterized in that, The first tool interface is the same as the second tool interface.

5. The power tool system according to claim 1, characterized in that, The second positive electrode active material includes at least one of NCA, NCM, NCMA, and LMO materials.

6. The power tool system according to claim 1, characterized in that, The first positive electrode active material includes nano-lithium manganese iron phosphate particles, and the first positive electrode active material and the second positive electrode active material are stirred and mixed to manufacture the first positive electrode sheet.

7. The power tool system according to claim 1, characterized in that, The proportion of the first positive electrode active material in the first positive electrode sheet is greater than or equal to 20% and less than or equal to 80%; the ratio of manganese to iron in the nano-lithium manganese iron phosphate particles of the first positive electrode active material is greater than or equal to 3:7 and less than or equal to 7:

3.

8. The power tool system according to claim 1, characterized in that, The rated capacity of the first battery pack is greater than or equal to 1.5Ah; and / or the nominal voltage of the first battery pack is greater than or equal to 10.8V and less than or equal to 120V.

9. The power tool system according to claim 1, characterized in that, The first battery cell is a pouch cell or a cylindrical cell.

10. The power tool system according to claim 1, characterized in that, The controller of the power tool is equipped with different temperature control strategies corresponding to the first battery pack and the second battery pack, respectively.

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