Battery pack for power tool and power tool

Abstract

The application discloses a battery pack for electric tools and an electric tool. The battery pack for electric tools comprises a shell assembly, a closed cavity is formed, a battery cell module is arranged in the closed cavity, and at least two switchable valve assemblies are arranged on the shell assembly and can be operated to allow gas exchange between the inside and outside of the closed cavity. The application can quickly dissipate heat in the battery pack, thereby improving the charging and discharging capacity of the battery pack and increasing the service life of the battery pack.

Description

Technical Field

[0001] This application relates to a power tool, specifically to a battery pack for an electric tool and an electric tool. Background Technology

[0002] Power tools play a vital role in daily life and production. They include, but are not limited to, electric drills, impact drills, impact wrenches, impact screwdrivers, angle grinders, and electric grinders. By changing different tool attachments, various tasks can be performed. Electric drills and impact drills can be equipped with drill bits of different diameters to drill holes in objects; impact wrenches are used to tighten bolts and nuts; impact screwdrivers are typically used to loosen or tighten screws; angle grinders can be used for grinding and cutting; and electric grinders, as high-speed rotating tools driven by electricity, are widely used in metal processing, wood carving, construction repair, and DIY crafts, achieving various processing tasks such as grinding, cutting, polishing, and carving by changing different grinding heads. Using power tools can improve work efficiency and reduce labor intensity.

[0003] Power tools typically use battery packs as a power source for ease of use and portability. Once the battery is depleted, it can be recharged for continued use. However, current technology uses a fully enclosed battery pack structure, which prevents heat from dissipating quickly. This prevents the temperature of the battery cells from effectively dropping to ambient temperature, thus shortening the battery pack's cycle life.

[0004] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0005] One objective of this application is to solve or at least alleviate some or all of the aforementioned problems.

[0006] To achieve this objective, the present invention adopts the following technical solution: A battery pack for power tools includes: a housing assembly forming a sealed cavity; a battery cell module disposed within the sealed cavity; the battery pack for power tools further includes: at least two switchable valve assemblies disposed on the housing assembly and operable to allow gas exchange between the inside and outside of the sealed cavity.

[0007] In some embodiments, a seal is also included, disposed between the valve assembly and the housing assembly, which seals off gas within the housing assembly from the sealed cavity when the valve assembly is not activated.

[0008] In some embodiments, the battery module includes a plurality of battery cells and a support component, the support component being configured to support at least the battery cells, a first airflow path being formed between the support component and the battery cells, and a second airflow path being formed between the support component and the housing component.

[0009] In some embodiments, the support component has a component opening, and the valve component is disposed at the component opening to connect to the first airflow path.

[0010] In some embodiments, the valve assembly includes a fixing member, a first elastic member, and a first movable member. The fixing member is fixed to the housing assembly. One end of the first elastic member abuts against the fixing member. The first movable member is disposed at the other end of the first elastic member. The first movable member can be operated to compress the first elastic member to connect the air in the sealed cavity with the outside.

[0011] In some embodiments, the housing assembly is provided with a first mounting hole through which the bottom end of the first movable member is exposed; when the first movable member is operatively compressed by the first elastic member, the first mounting hole serves as an airflow exchange hole to allow gas to flow between the inside and outside of the housing assembly.

[0012] In some embodiments, the housing assembly is provided with a second mounting hole and a third mounting hole; the valve assembly includes a first valve element and a second valve element; the first valve element is mounted in the second mounting hole; and the second valve element is mounted in the third mounting hole.

[0013] In some embodiments, a linkage is further included, which is connected between the first valve and the second valve; when the first valve is operated, the linkage drives the second valve to move so that the third mounting hole serves as the main airflow exchange hole to allow gas to flow inside and outside the housing assembly.

[0014] A battery pack includes: a housing assembly; a cell module disposed within the housing assembly; the battery pack further includes: at least two switchable valve assemblies disposed on the housing assembly and operable to allow gas exchange between the inside and outside of the housing assembly; wherein, when the battery pack is coupled to an electrical device, the valve assemblies are triggered by the electrical device to allow gas exchange between the inside and outside of the housing assembly.

[0015] In some embodiments, the valve assembly includes a fixing member, a first elastic member, and a first movable member. The fixing member is fixed to the housing assembly, one end of the first elastic member abuts against the fixing member, and the first movable member is disposed at the other end of the first elastic member. The first movable member can be operated to compress the first elastic member to communicate air inside the housing assembly with the outside.

[0016] In some embodiments, the housing assembly is provided with a first mounting hole through which the bottom end of the first movable member is exposed; when the first movable member is operatively compressed by the first elastic member, the first mounting hole serves as an airflow exchange hole to allow gas to flow between the inside and outside of the housing assembly.

[0017] In some embodiments, the battery module includes a plurality of battery cells and a support assembly, the support assembly being configured to support at least the battery cells, and the gap between the housing assembly and the support assembly being greater than or equal to 2 mm and less than or equal to 15 mm.

[0018] In some embodiments, at least two of the valve assemblies are disposed on the same surface of the housing assembly.

[0019] In some embodiments, at least two of the valve assemblies are disposed on different surfaces of the housing assembly.

[0020] A battery pack for power tools includes: a housing assembly; a cell module disposed within the housing assembly; the battery pack further includes: at least two switchable valve assemblies disposed on the housing assembly and operable to allow gas exchange between the inside and outside of the housing assembly; wherein the direction of airflow through the valve assemblies is changeable.

[0021] In some embodiments, the airflow direction through the valve assembly can be changed at a preset frequency.

[0022] In some embodiments, a commutator is also included, which is configured to change the direction of airflow through the valve assembly.

[0023] An electric tool includes: a tool body; a battery mounting section configured to mount a battery pack; the battery pack includes: a housing assembly; a cell module disposed within the housing assembly; the battery pack further includes: at least two switchable valve assemblies disposed on the housing assembly and operable to allow gas exchange between the inside and outside of the housing assembly; wherein the electric tool further includes: a pump system disposed on the tool body, capable of triggering the valve assemblies when the battery pack is coupled to the tool body.

[0024] In some embodiments, the valve assembly includes a fixing member, a first elastic member, and a first movable member. The fixing member is fixed to the housing assembly, one end of the first elastic member abuts against the fixing member, and the first movable member is disposed at the other end of the first elastic member. The first movable member can be operated to compress the first elastic member to communicate air inside the housing assembly with the outside.

[0025] In some embodiments, the housing assembly is provided with a first mounting hole through which the bottom end of the first movable member is exposed; when the first movable member is operatively compressed by the first elastic member, the first mounting hole serves as an airflow exchange hole to allow gas to flow between the inside and outside of the housing assembly.

[0026] In some embodiments, the pump system includes a pump trigger configured to trigger the first movable element when the battery pack is coupled to the tool body.

[0027] In some embodiments, the pump system further includes a commutator configured to change the direction of airflow through the valve assembly.

[0028] In some embodiments, the pump system further includes a gas drying device configured to dry the gas.

[0029] The advantages of this application are: This application provides a battery pack for power tools, in which the battery cell module is disposed within a housing assembly. At least two switchable valve assemblies are provided on the housing assembly. These valve assemblies are operable to allow gas exchange between the inside and outside of the sealed cavity of the housing assembly, and the direction of airflow through the valve assemblies can be changed. By providing the valve assemblies, when the battery pack needs cooling, the valve assemblies open, allowing outside gas to enter the sealed cavity for heat exchange and carrying heat out of the sealed cavity. This method effectively cools the battery cell module, allowing heat to dissipate rapidly from the battery pack, thereby improving the battery pack's charge / discharge capacity and extending its lifespan. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of one embodiment of this application; Figure 2 This is a schematic diagram of a battery pack in one embodiment of this application; Figure 3 This is a schematic diagram of the battery pack from another perspective in one embodiment of this application; Figure 4 This is a cross-sectional view of the battery pack in one embodiment of this application; Figure 5This is a schematic diagram of a battery pack housing assembly removed in one embodiment of this application; Figure 6 This is another cross-sectional view of the battery pack in one embodiment of this application; Figure 7 This is another cross-sectional view of the battery pack in one embodiment of this application; Figure 8 This is a schematic diagram of the first valve component and the second valve component in one embodiment of this application.

[0031] In the picture: 100. Battery pack; 1. Housing assembly; 11. Base; 12. Sleeve; 13. First mounting hole; 14. Second mounting hole; 15. Third mounting hole; 2. Cell module; 21. Cell; 22. Support assembly; 221. Fan cover; 222. Cell bracket; 222; 23. Assembly opening; 3. Valve assembly; 31. First movable part; 32. First elastic part; 33. Fixing part; 331. Screw; 34. First valve part; 341. Trigger; 342. Second elastic part; 35. Second valve part; 351. Second movable part; 352. Third elastic part; 4. Sealing part; 5. First airflow path; 6. Second airflow path; 7. Linkage part; 71. First linkage part; 72. Second linkage part; 200. Pump system; 210. Commutator; 220. Air pump; 221. Gas drying device. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 ​​that do not use 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.

[0037] 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.

[0038] 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.

[0039] Power tools typically integrate a motor, working attachments, and a control board containing electronic components into a single housing. The working attachments are used to perform the tasks. In practical applications, by changing different working attachments, power tools can function as lawnmowers, snowplows, tampers, water trucks, pressure washers, saws, etc., playing an important role in various fields such as horticulture, construction, agriculture, and daily life. Power tools can also be table saws, such as table saws, miter saws, circular saws, metal cutters, bakelite milling machines, edge trimmers, marble cutters, etc. Alternatively, power tools can be grinding tools, such as angle grinders, sanders, and electric grinders. Power tools can also be electric drills and impact drills, which can be equipped with drill bits of different diameters to drill holes in objects. Power tools can also be impact wrenches, used for tightening bolts and nuts, and impact screwdrivers are typically used to loosen or tighten screws.

[0040] The power tool is a type of power tool that operates using direct current (DC) or alternating current (AC). It is powered by a rechargeable battery pack. In this embodiment, the battery pack is a battery module, which, in conjunction with a corresponding power circuit, supplies power to the power tool. Those skilled in the art will understand that in other embodiments, the power tool can also be powered by other power supply devices. For example, the power supply can be an AC power line connected to the mains, or it can be other connecting cables that can be connected to a power supply device. The mains power or other power supply device, in conjunction with corresponding rectification, filtering, and voltage regulation circuits, provides power to the corresponding components of the power tool.

[0041] In this application, the electrical equipment may include the aforementioned power tools, or it may include a charging device for charging a battery pack, such as a charger.

[0042] In existing technologies, battery packs generate significant heat during charging and discharging, resulting in a short cycle life. To address this issue, improve the charging and discharging capabilities of the battery pack, and extend its lifespan, such as... Figures 1-8 As shown, this application provides a battery pack 100 for power tools. The battery pack 100 for power tools includes a housing assembly 1, a cell module 2, and at least two switchable valve assemblies 3.

[0043] The housing assembly 1 forms a sealed cavity, and the battery cell module 2 is disposed within the sealed cavity. A valve assembly 3, disposed on the housing assembly 1, is operable and allows gas exchange between the inside and outside of the sealed cavity. Two, three, four, etc., sets of valve assemblies 3 can be arranged on the housing assembly 1; the specific number is designed according to the specifications of the battery pack 100 and is not subject to further restrictions. It should be noted that the valve assembly 3 is operable to allow gas to enter and exit the housing assembly 1; that is, gas cannot enter or exit the housing assembly 1 through the valve assembly 3 unless triggered. In some embodiments, a pressure relief device is also provided on the housing assembly 1. When the battery pack 100 does not experience thermal runaway, the pressure relief device prevents gas exchange between the inside and outside of the pack. In the event of thermal runaway, the pressure relief device allows the high-temperature, high-pressure gas generated inside the pack to be quickly discharged from the housing assembly 1, preventing the battery pack 100 from exploding or experiencing other major safety accidents. In this application, apart from the aforementioned valve assembly 3, pressure relief device, or other similar operable components that can be opened under specific conditions, the housing assembly 1 has no other gaps or channels for gas or liquid exchange, thus the housing assembly 1 can form a sealed cavity. That is to say, the sealed cavity in this application can maintain a state of material isolation (such as gas, liquid, dust) from the external environment for a long time or under certain conditions.

[0044] By configuring valve assemblies 3, when the battery pack 100 needs cooling, at least two valve assemblies 3 open, allowing outside gas to enter the sealed cavity for heat exchange and carrying the heat out of the sealed cavity. This method effectively cools the cell module 2, allowing the heat in the battery pack 100 to dissipate quickly, thereby improving the charging and discharging capacity of the battery pack 100 and increasing its service life.

[0045] like Figure 6 and Figure 7 As shown, in some embodiments, the power tool battery pack 100 further includes a seal 4, which is disposed between the valve assembly 3 and the housing assembly 1. When the valve assembly 3 is not activated, the gas inside the housing assembly 1 is sealed and isolated within the sealed cavity. By providing the seal 4, the gap between the valve assembly 3 and the housing assembly 1 can be effectively sealed, thus maintaining the sealed cavity in a sealed state when the valve assembly 3 is not activated. This prevents external gas carrying impurities from entering the housing assembly 1 and affecting the battery cell module 2, and also ensures the stability of the gas environment within the sealed cavity. The seal 4 can be made of rubber or silicone. When the valve assembly 3 is not activated, the seal 4 is deformed by the pressure of the valve assembly 3, thereby achieving a sealing function.

[0046] like Figures 4 to 7As shown, in some embodiments, the battery module 2 includes multiple battery cells 21 and a support assembly 22. The support assembly 22 is configured to support at least one battery cell 21. A first airflow path 5 is formed between the support assembly 22 and the battery cell 21, and a second airflow path 6 is formed between the support assembly 22 and the housing assembly 1. The support assembly 22 includes a battery cell bracket 222 and a fan shroud 221. The battery cell bracket 222 is disposed at both ends of the battery cell 21 along the axial direction, and the fan shroud 221 is disposed between the two battery cell brackets 222. By setting the battery cell bracket 222, the battery cell 21 can be supported and positioned, facilitating the installation of the battery cell 21. By setting the fan shroud 221, the first airflow path 5 and the second airflow path 6 can be formed. When the valve assembly 3 is activated, external gas can enter through one of the first airflow path 5 and the second airflow path 6, and exit through the other of the first airflow path 5 and the second airflow path 6. By rationally planning the first airflow path 5 and the second airflow path 6, the cell 21 can fully exchange heat with the incoming external gas, ensuring sufficient cooling of the cell 21 and extending the service life of the battery pack 100.

[0047] like Figures 4 to 7 As shown, in some embodiments, the support component 22 has a component opening 23, and the valve component 3 is disposed at the component opening 23 to connect to the first airflow path 5. By opening the component opening 23, when the valve component 3 located at the component opening 23 is activated, the first airflow path 5 is connected to the outside through the component opening 23. The end of the support component 22 formed by the fan shroud 221 and the cell support 222 away from the component opening 23 is an open structure. When outside gas enters the support component 22 through the component opening 23, it flows along the first airflow path 5 until it enters the second airflow path 6 through the end away from the component opening 23. With the above arrangement, the valve component 3 located at the component opening 23 can effectively control the connection and closure of the first airflow path 5 with the outside. In order to ensure a seal between the valve component 3 and the support component 22, a sealing element 4 is also provided at the component opening 23 of the support component 22. When the valve component 3 located at the component opening 23 is not activated, the component opening 23 is in a closed state.

[0048] like Figure 6 and Figure 7As shown, in some embodiments, the valve assembly 3 includes a fixing member 33, a first elastic member 32, and a first movable member 31. The fixing member 33 is fixed to the housing assembly 1. One end of the first elastic member 32 abuts against the fixing member 33, and the first movable member 31 is disposed at the other end of the first elastic member 32. The first movable member 31 can be operated to compress the first elastic member 32 to connect the air in the sealed cavity to the outside. The housing assembly 1 includes a base 11 and a barrel 12 connected to the base 11. The fixing member 33 is installed on the barrel 12 by screws 331. When the valve assembly 3 is not triggered, the first elastic member 32 allows the first movable member 31 to fit against the seal 4. When the valve assembly 3 is triggered, the first movable member 31 moves toward the fixing member 33, thereby separating from the seal 4, allowing the sealed cavity to connect with the outside gas. At this time, the first elastic member 32 is compressed and is in a compressed energy storage state. When the force of operating the valve assembly 3 is removed, the first movable member 31 automatically resets under the action of the first elastic member 32. The first elastic element 32 can be a compression spring or a compression elastic sheet; no further restrictions are imposed here.

[0049] like Figure 3 and Figure 4 As shown, in some embodiments, the housing assembly 1 is provided with a first mounting hole 13, through which the bottom end of the first movable member 31 is exposed. When the first movable member 31 is operated to compress the first elastic member 32, the first mounting hole 13 acts as an air exchange hole, allowing gas to flow between the inside and outside of the housing assembly 1. By providing the first mounting hole 13, subsequent operation of the first movable member 31 is facilitated, thereby facilitating the control of the opening and closing of the valve assembly 3.

[0050] like Figure 8 As shown, in some embodiments, the housing assembly 1 is provided with a second mounting hole 14 and a third mounting hole 15. The valve assembly 3 includes a first valve element 34 and a second valve element 35. The first valve element 34 is mounted in the second mounting hole 14, and the second valve element 35 is mounted in the third mounting hole 15. Through the above arrangement, the first valve element 34 and the second valve element 35 achieve linkage control; when the first valve element 34 is triggered, the second valve element 35 is triggered to open.

[0051] like Figure 8As shown, in some embodiments, the power tool battery pack 100 further includes a linkage 7 connected between a first valve member 34 and a second valve member 35. When the first valve member 34 is operated, the linkage 7 drives the second valve member 35 to move, allowing gas to flow inside and outside the housing assembly 1 through the third mounting hole 15 as the main airflow exchange hole. The first valve member 34 includes a trigger member 341 and a second elastic member 342. The trigger member 341 is slidably disposed in the barrel 12, one end of the second elastic member 342 abuts against the barrel 12, and the other end of the second elastic member 342 abuts against the trigger member 341. The second valve member 35 includes a second movable member 351 and a third elastic member 352. One end of the third elastic member 352 is connected to the barrel 12, and the other end of the third elastic member 352 is connected to the second movable member 351. The linkage 7 includes a first linkage part 71 and a second linkage part 72. The first linkage part 71 is slidably disposed in the barrel 12, and the second linkage part 72 is rotatably disposed in the barrel 12 via a first pin. The first end of the second linkage part 72 is rotatably connected to the first linkage part 71 via a second pin. During the upward lifting of the trigger 341, the second elastic member 342 is compressed, the first linkage part 71 moves upward along with the first end of the second linkage part 72, and the second end of the second linkage part 72, away from the first end, moves downward, thereby pushing the second movable member 351 downward. The third elastic member 352 is stretched, causing the third mounting hole 15 to open, allowing gas to flow inside and outside the housing assembly 1. When the force lifting the trigger 341 is removed, the second elastic member 342 pushes the trigger 341 back to its original position, and the third elastic member 352 pulls the second movable member 351 upward to its original position. Using the above method, the second movable member 351 can only move and open after the trigger member 341 is activated, thus preventing the second movable member 351 from being accidentally touched and opened. In one embodiment, the second elastic member 342 can be a compression spring, and the third elastic member 352 can be a tension spring.

[0052] like Figures 1-8 As shown, this application also provides a battery pack 100, which includes a housing assembly 1, a cell module 2, and at least two switchable valve assemblies 3. The cell module 2 is disposed within the housing assembly 1. The at least two switchable valve assemblies 3 are disposed on the housing assembly 1 and are operable to allow gas exchange between the inside and outside of the housing assembly 1. When the battery pack 100 is coupled to an electrical device, the valve assemblies 3 are triggered by the electrical device to allow gas exchange between the inside and outside of the housing assembly 1.

[0053] With the above configuration, after the battery pack 100 is coupled to the electrical equipment, the valve assembly 3 is triggered, allowing external gas to enter the housing assembly 1 for heat exchange and carrying away the heat from the cell module 2. This effectively cools the cell module 2, allowing the heat in the battery pack 100 to dissipate quickly, thereby improving the charging and discharging capacity of the battery pack 100 and increasing its service life.

[0054] like Figures 5 to 7 As shown, in some embodiments, the battery module 2 includes multiple battery cells 21 and a support assembly 22. The gap L between the housing assembly 1 and the support assembly 22 is greater than or equal to 2 mm and less than or equal to 15 mm. The gap L between the housing assembly 1 and the support assembly 22 can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, etc., without further limitation. The gap between the housing assembly 1 and the support assembly 22 forms a second airflow path 6 between the housing assembly 1 and the support assembly 22. By ensuring that subsequent external gas enters through the first airflow path 5 and flows out through the second airflow path 6, effective cooling of the battery cell 21 can be guaranteed, and it can also avoid...

[0055] like Figure 6 As shown, in some embodiments, at least two valve assemblies 3 are disposed on the same surface of the housing assembly 1. By arranging the valve assemblies 3 on the same surface of the housing assembly 1, the volume of the battery pack 100 can be reduced, while facilitating the coupling of the battery pack 100 with electrical equipment.

[0056] In some embodiments, at least two valve assemblies 3 are disposed on different surfaces of the housing assembly 1. This arrangement allows external gas to enter through the first airflow path 5 and then exit through the second airflow path 6 via the valve assemblies 3 located on different surfaces, thus enabling a reasonable arrangement of the first airflow path 5 and the second airflow path 6.

[0057] like Figures 1-8 As shown, this application also provides a battery pack 100 for power tools, which includes a housing assembly 1, a cell module 2, and at least two switchable valve assemblies 3.

[0058] The battery cell module 2 is housed inside the housing assembly 1. The valve assembly 3 is mounted on the housing assembly 1 and is operable to allow gas exchange between the inside and outside of the housing assembly 1. The direction of the airflow through the valve assembly 3 is changeable.

[0059] By incorporating valve assembly 3, when the battery pack 100 requires cooling, valve assembly 3 opens, allowing outside air to enter the sealed cavity for heat exchange and carrying heat out of the sealed cavity. Furthermore, the cooling effect on the cell module 2 can be ensured by switching the airflow direction. Through these methods, the cell module 2 can be effectively cooled, allowing heat in the battery pack 100 to dissipate quickly, thereby improving the charging and discharging capacity of the battery pack 100 and extending its service life.

[0060] In some embodiments, the airflow direction through the valve assembly 3 can be changed at a preset frequency. By setting the switching frequency of the airflow direction, it is possible to switch between two ways: external gas enters the housing assembly 1 through the first airflow path 5 and enters the housing assembly 1 through the second airflow path 6, thereby enabling effective cooling of different parts of the battery cell module 2.

[0061] In some embodiments, the battery pack 100 further includes a commutator 210 configured to change the direction of airflow through the valve assembly 3. The airflow direction of the valve assembly 3 can be controlled by controlling the commutator.

[0062] like Figures 1-8 As shown, this application also provides an electric tool, including a tool body, a battery mounting section, a pump system 200, and a battery pack 100.

[0063] The battery mounting section is configured to mount a battery pack 100. The battery pack 100 includes a housing assembly 1, battery cell modules 2, and valve assemblies 3 with at least two shell switches. The battery cell modules 2 are disposed within the housing assembly 1, and the at least two operable valve assemblies 3 are disposed on the housing assembly 1, allowing gas exchange between the inside and outside of the housing assembly 1. A pump system 200 is disposed on the tool body and can trigger the valve assemblies 3 when the battery pack 100 is coupled to the tool body.

[0064] With the above settings, when the battery pack 100 is coupled to the power tool, the pump system 200 drives the gas circulation to quickly exchange heat with the cell module 2, thereby reducing the temperature of the cell module 2 and allowing the heat in the battery pack 100 to dissipate quickly, thereby improving the charging and discharging capability of the battery pack 100 and increasing the service life of the battery pack 100.

[0065] In some embodiments, the pump system 200 includes a pump trigger configured to actuate a first movable member 31 of the valve assembly 3 when the battery pack 100 is coupled to the tool body. The pump trigger can push the first movable member 31 upward, thereby connecting the assembly opening 23 with the first airflow path 5. Under the action of the pump system 200, external gas can smoothly enter the first airflow path 5 through the assembly opening 23 to force cooling of the battery cell module 2.

[0066] like Figure 1 As shown, in some embodiments, the pump system 200 further includes a commutator 210, which is configured to change the airflow direction through the valve assembly 3. By setting the commutator 210, the flow path of external gas can be controlled, thereby enabling sufficient cooling of the battery cell module 2 as needed and ensuring temperature uniformity in different parts of the battery cell module 2. The commutator 210 can be a three-position four-way solenoid directional valve, and by controlling the commutator 210, the airflow direction entering the housing assembly 1 can be controlled.

[0067] like Figure 1 As shown, in some embodiments, the pump system 200 further includes a gas drying device 221, which is configured to dry the gas. By setting the gas drying device 221, the gas entering the housing assembly 1 from the outside can be dried, thereby reducing the moisture content of the gas. When the gas enters the housing assembly 1 to cool the battery cell module 2, it can prevent short circuits in the battery cells 21 of the battery cell module 2. The gas drying device 221 can be made of materials such as silica gel, molecular sieve, activated alumina, calcium chloride, composite desiccant, and polypropylene fiber. By reasonably selecting the material of the gas drying device 221 and cooperating with appropriate maintenance measures, the performance and lifespan of the gas drying device 221 at the air inlet of the battery pack 100 can be effectively improved.

[0068] like Figure 1 As shown, in some embodiments, the pump system 200 further includes a fan 220, which is connected to the commutator 210 through a pipe. It can draw in outside gas through the gas drying device 221 and then into the commutator 210 and the battery pack 100, and then out through the commutator 210 and the fan 220 to achieve gas circulation.

[0069] 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 battery pack for power tools, characterized in that, include: The housing assembly (1) forms a sealed cavity; The battery cell module (2) is disposed in the sealed cavity; The power tool battery pack (100) also includes: At least two switchable valve assemblies (3) are disposed on the housing assembly (1) and operable to allow gas exchange between the inside and outside of the sealed cavity.

2. The battery pack for power tools according to claim 1, characterized in that, It also includes a seal (4) disposed between the valve assembly (3) and the housing assembly (1), which seals and isolates the gas in the housing assembly (1) from the sealed cavity when the valve assembly (3) is not activated.

3. The battery pack for power tools according to claim 1, characterized in that, The battery module (2) includes multiple battery cells (21) and a support component (22). The support component (22) is configured to support at least the battery cells (21). A first airflow path (5) is formed between the support component (22) and the battery cells (21). A second airflow path (6) is formed between the support component (22) and the housing component (1).

4. The battery pack for power tools according to claim 3, characterized in that, The support component (22) has a component opening (23), and the valve component (3) is disposed at the component opening (23) to connect to the first airflow path (5).

5. The battery pack for power tools according to any one of claims 1-4, characterized in that, The valve assembly (3) includes a fixing member (33), a first elastic member (32), and a first movable member (31). The fixing member (33) is fixed to the housing assembly (1). One end of the first elastic member (32) abuts against the fixing member (33). The first movable member (31) is disposed at the other end of the first elastic member (32). The first movable member (31) can be operated to squeeze the first elastic member (32) to connect the air in the sealed cavity with the outside.

6. The battery pack for power tools according to claim 5, characterized in that, The housing assembly (1) is provided with a first mounting hole (13), and the bottom end of the first movable member (31) is exposed through the first mounting hole (13); when the first movable member (31) is operated to compress the first elastic member (32), the first mounting hole (13) serves as an air exchange hole to allow gas to flow inside and outside the housing assembly (1).

7. The battery pack for power tools according to any one of claims 1-4, characterized in that, The housing assembly (1) is provided with a second mounting hole (14) and a third mounting hole (15); the valve assembly (3) includes a first valve component (34) and a second valve component (35); the first valve component (34) is installed in the second mounting hole (14); the second valve component (35) is installed in the third mounting hole (15).

8. The battery pack for power tools according to claim 7, characterized in that, It also includes a linkage (7) connected between the first valve (34) and the second valve (35); when the first valve (34) is operated, the linkage (7) drives the second valve (35) to move so that the third mounting hole (15) serves as the main airflow exchange hole to allow gas to flow inside and outside the housing assembly (1).

9. A battery pack, characterized in that, include: Housing assembly (1); The battery cell module (2) is disposed within the housing assembly (1); The battery pack (100) also includes: At least two switchable valve assemblies (3) are provided on the housing assembly (1) and are operable to allow gas exchange between the inside and outside of the housing assembly (1); In the case where the battery pack (100) is coupled to the electrical device, the valve assembly (3) is triggered by the electrical device to allow gas exchange inside and outside the housing assembly (1).

10. A battery pack for power tools, characterized in that, include: Housing assembly (1); The battery cell module (2) is disposed within the housing assembly (1); The power tool battery pack (100) also includes: At least two switchable valve assemblies (3) are provided on the housing assembly (1) and are operable to allow gas exchange between the inside and outside of the housing assembly (1); The direction of the airflow through the valve assembly (3) can be changed.

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