WO2024083143A1 - 电池包及电动工具系统 - Google Patents

电池包及电动工具系统 Download PDF

Info

Publication number
WO2024083143A1
WO2024083143A1 PCT/CN2023/125159 CN2023125159W WO2024083143A1 WO 2024083143 A1 WO2024083143 A1 WO 2024083143A1 CN 2023125159 W CN2023125159 W CN 2023125159W WO 2024083143 A1 WO2024083143 A1 WO 2024083143A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat
heat absorber
battery cell
battery pack
shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/125159
Other languages
English (en)
French (fr)
Inventor
杨德中
李达
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Chervon Industry Co Ltd
Original Assignee
Nanjing Chervon Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN202322437140.2U external-priority patent/CN221687602U/zh
Application filed by Nanjing Chervon Industry Co Ltd filed Critical Nanjing Chervon Industry Co Ltd
Priority to EP23879131.3A priority Critical patent/EP4576329A4/en
Publication of WO2024083143A1 publication Critical patent/WO2024083143A1/zh
Priority to US19/087,781 priority patent/US20250219191A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/623—Portable devices, e.g. mobile telephones, cameras or pacemakers
    • H01M10/6235—Power tools
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/643—Cylindrical cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6562—Gases with free flow by convection only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to a heat dissipation structure, for example, to a battery pack and an electric tool system.
  • An electric tool in the related technology is a tool that uses electricity as a power source and can output linear motion or rotational motion.
  • electric tools such as sanders, impact drills, electric wrenches, lawn mowers, etc. Different types of electric tools are widely used in different usage scenarios and have a wide range of uses.
  • the controller is an indispensable part of power tools. With the diversification of power tool functions, the power density of the controller is getting higher and higher. However, the compactness and lightness of power tools lead to a decrease in the heat dissipation rate of the controller and an increase in the temperature rise, which causes the power tool to shut down due to over-temperature protection.
  • One object of the present application is to solve or at least alleviate part or all of the above problems.
  • the first object of the present application is to provide a battery pack and a power tool system to improve the heat dissipation efficiency of the power tool.
  • the present application provides a battery pack suitable for an electric tool, comprising: a shell; a battery cell assembly, which is arranged in the shell, and the battery cell assembly includes at least one battery cell unit; a heat absorber, which is in thermal contact with at least part of the battery cell unit, and the heat absorber is configured to absorb heat generated by the battery cell assembly during charging and discharging; wherein the heat absorber includes a hydrogel.
  • the battery cell assembly includes at least two battery cell units; and the heat absorber is at least partially disposed between the at least two battery cell units.
  • multiple battery cell units are arranged in multiple rows and columns; the heat absorber includes at least one heat absorber, which is a sheet structure made of hydrogel, and the heat absorber is arranged between two adjacent rows or two adjacent columns of battery cell units.
  • the heat absorber is disposed between the battery cell assembly and the housing.
  • the heat absorber is disposed on at least a portion of the outer surface of the battery cell unit.
  • the heat absorber at least covers the main heating area of the battery cell unit, and the main heating area is an area extending from the middle position of the outer surface of the battery cell unit to the positive end of the battery cell unit by a set value.
  • the battery cell unit is a cylindrical battery cell.
  • the ratio of the volume of the heat absorber after complete water loss to the volume of the heat absorber after water replenishment is greater than or equal to 1 and less than or equal to 2.
  • the thickness of the heat absorber is greater than or equal to 0.5 mm and less than or equal to 2 mm.
  • the housing is formed with a vent, and at least a portion of the heat dissipation airflow entering the housing from the vent contacts the heat absorber.
  • the battery pack is configured to power a power tool; the power tool includes a handheld power tool, a bench tool, or a wheeled power tool.
  • the total energy of the battery pack is greater than or equal to 0.1 kW ⁇ h.
  • the sweating temperature of the heat absorber is lower than the over-temperature protection temperature of the battery pack.
  • a ratio of the volume of the heat absorber to the discharge power of the battery pack is 25 mm 3 /W to 122 mm 3 /W.
  • the temperature of the battery cell assembly is reduced by 12% to 24%.
  • An electric tool system comprises: a housing; a printed circuit board assembly arranged in the housing; and a heat absorber arranged in the housing; wherein the heat absorber comprises hydrogel.
  • the heat sink is in thermal contact with at least a portion of the printed circuit board assembly.
  • a heat dissipation structure is applied to an electric tool system, and comprises: a shell; a heat absorber, at least partly arranged in the shell; a moisture absorption device, at least arranged to transfer moisture to the heat absorber; and the heat absorber comprises a hydrogel.
  • the shell is a thermally conductive silicone shell, a polyethylene terephthalate (PET) shell, a polyurethane (PU) shell or an aluminum shell.
  • PET polyethylene terephthalate
  • PU polyurethane
  • the power tool system includes a handheld power tool, a garden power tool, a charger, and a battery pack.
  • FIG1 is a structural perspective view of an electric tool provided in an embodiment of the present application.
  • FIG2 is a structural perspective view of a charging assembly provided in an embodiment of the present application.
  • FIG3 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application.
  • FIG4 is an exploded view of a battery pack provided in an embodiment of the present application.
  • FIG5 is another exploded view of a battery pack provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of the structure of a group of heat absorbers in a battery pack provided in an embodiment of the present application.
  • FIG7 is a schematic structural diagram of a battery cell assembly and a heat absorber of a battery pack provided in an embodiment of the present application;
  • FIG8 is a schematic diagram of a heat absorber covering the main heating area of the battery cell unit in FIG7 ;
  • FIG9 is another schematic diagram of the structure of the battery cell assembly and the heat absorber of the battery pack provided in an embodiment of the present application.
  • FIG10 is a schematic diagram of a heat absorber provided in an embodiment of the present application.
  • FIG11 is a schematic diagram of a structure of a capillary moisture absorption device provided in an embodiment of the present application.
  • FIG. 12 is a schematic diagram of another structure of a capillary hygroscopic device provided in an embodiment of the present application.
  • the term "and/or” is a description of the association relationship between related objects, indicating that three relationships can exist.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this application generally indicates that the related objects before and after are in an "and/or” relationship.
  • connection may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation.
  • direct connection refers to the connection of two parts or components without the need for an intermediate component
  • indirect connection refers to the connection of two parts or components to at least one intermediate component respectively, and the connection of the two parts or components is achieved through the intermediate component.
  • connection and “coupling” are not limited to physical or mechanical connection or coupling, and may include electrical connection or coupling.
  • relative terms e.g., "about,” “approximately,” “substantially,” etc.
  • the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. Relative terms may refer to plus or minus 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.
  • substantially may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).
  • the function performed by a component can be performed by one component, multiple components, one part, or multiple parts.
  • the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.
  • controller In this application, the terms “controller”, “processor”, “central processing unit”, “CPU”, and “MCU” are interchangeable. When a unit “controller”, “processor”, “central processing unit”, “CPU”, or “MCU” is used to perform a specific function, unless otherwise specified, these functions can be performed by a single unit or multiple units.
  • the terms “device”, “module” or “unit” may be implemented in the form of hardware or software to achieve specific functions.
  • the terms “calculate”, “judge”, “control”, “determine”, “identify”, etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).
  • FIG1 is a structural perspective view of the electric tool provided by the present application.
  • the electric tool 10 may be an electric drill, which can at least provide torque to assist the screw to be driven into the workpiece, and can also provide impact force to perform impact operations, so as to meet the requirements of the present invention.
  • the technical solution in this application can be applied to handheld power tools such as electric drills, electric wrenches, electric screwdrivers, electric hammer drills, electric circular saws, sanders, bench-type power tools such as table saws, outdoor tools such as lawn mowers, electric shears, pruning machines, electric saws, and manned lawn mowers, snow blowers, all-terrain vehicles, electric motorcycles, and other wheeled power tools.
  • the following embodiments are some of the embodiments in this application, but not all of them.
  • the power tool 10 includes a tool body 200 and a battery pack 100 configured to provide power to the tool body 200.
  • the battery pack 100 uses a heat absorber 130 containing hydrogel to absorb the heat generated by the battery pack 100 during discharge to achieve heat dissipation of the battery pack 100, as shown in FIG4.
  • the battery pack 100 is detachably connected to the tool body 200 to provide power to the power tool 10.
  • the battery pack 100 is disposed in the tool body 200 to provide power to the power tool 10.
  • the charging assembly 20 includes a battery pack 100 and a charger 300 configured to charge the battery pack 100.
  • the battery pack 100 uses a heat absorber 130 containing hydrogel to absorb the heat generated by the battery pack 100 during the charging process to achieve heat dissipation of the battery pack 100.
  • the battery pack 100 is a rechargeable lithium chemical battery, such as a lithium-ion battery.
  • the battery pack 100 can be a cylindrical lithium battery or a soft pack battery.
  • the rechargeable battery pack 100 can also be configured as other lithium chemical batteries with lithium as the matrix, or rechargeable batteries with other chemical matrices such as nickel-cadmium and nickel-metal hydride.
  • the battery pack 100 can be, but is not limited to, square, cylindrical, tower-shaped or other shapes.
  • the battery pack 100 can also be a lithium iron phosphate battery.
  • the battery pack 100 includes a shell 110, a battery cell assembly 120 and a heat absorber 130.
  • the shell 110 forms a accommodating cavity, and the battery cell assembly 120 and the heat absorber 130 are both arranged in the accommodating cavity.
  • the shell 110 includes an upper shell 111 and a lower shell 112, the upper shell 111 has an upper shell cavity opening downward, and the lower shell 112 has a lower shell cavity opening upward, the upper shell 111 and the lower shell 112 can be buckled together, and the upper shell cavity and the lower shell cavity can form a complete accommodating cavity.
  • the shell 110 can also be formed by splicing a left shell and a right shell. The shell 110 with a split design is easy to assemble and easy to process and manufacture.
  • the battery cell assembly 120 includes at least one battery cell 121, and the battery cell 121 can be charged and discharged.
  • the battery cell assembly 120 includes one battery cell 121 or multiple battery cells 121, and the number of battery cells 121 depends on the different rated nominal values of the battery pack 100. Battery packs 100 with different nominal values can be realized by connecting multiple rechargeable battery cells 121 in series.
  • the heat absorber 130 is in thermal contact with at least part of the battery cell assembly 120. In some embodiments, the heat absorber 130 is in thermal contact with at least part of the battery cell unit 121 to absorb the heat generated by the battery cell assembly 120 during the charging and discharging process of the battery pack 100. In some embodiments, the heat absorber 130 includes a hydrogel 133.
  • the hydrogel 133 is a gel with water as a dispersion medium, and a portion of the water-soluble polymer having a network cross-linked structure is introduced into the hydrogel. The hydrophilic residues are divided into hydrophobic groups and hydrophilic residues.
  • a vent is formed on the housing 110, and at least part of the heat dissipation airflow entering the housing 110 from the vent contacts the heat absorber 130 to improve the heat dissipation effect and enable the hydrogel 133 as the heat absorber 130 to absorb moisture from the air.
  • the thermal contact between the heat absorber 130 and the battery cell unit 121 can be understood as the heat absorber 130 directly contacts the surface of the battery cell unit 121 to achieve heat conduction, or it can be understood as the heat absorber 130 is not in direct contact with the surface of the battery cell unit 121, but is indirectly heat-conducted through a heat-conducting material.
  • the above-mentioned heat-conducting material can be a heat conductor or air.
  • the heat absorber 130 includes a hydrogel 133, which can be understood as the heat absorber 130 being a single heat-absorbing structure made of only the hydrogel 133, or it can be understood as the heat absorber 130 being a mixed heat-absorbing structure made of the hydrogel 133 and other heat-absorbing materials.
  • the battery pack 100 in the present application adopts the hydrogel 133 as the main component of the heat absorber 130.
  • the hydrogel 133 can absorb the heat generated by the battery cell assembly 120 during the charging and discharging process, and dissipate the heat by volatilizing water.
  • the hydrogel 133 will not undergo phase change during the heat absorption process, but only shrink in volume.
  • the hydrogel 133 can absorb moisture from the air, and the volume of the hydrogel 133 after absorbing water increases. In this way, repeated water loss and water absorption realize repeated heat absorption and recycling.
  • the hydrogel 133 will not leak or lose materials when absorbing heat, thereby improving the user experience and the reliability of the battery pack 100.
  • the sweating temperature of the heat absorber 130 is lower than the over-temperature protection value of the battery pack 100, so that before the over-temperature protection of the battery pack 100 occurs, the heat generated by the battery cell assembly 120 during the charging and discharging process of the battery pack 100 absorbed by the heat absorber 130 has caused the temperature of the heat absorber 130 to rise to the sweating temperature. After the heat absorber 130 rises to the sweating temperature, the heat absorber 130 begins to evaporate water to dissipate heat from the battery pack 100, so that the temperature of the battery pack 100 begins to drop, thereby preventing the battery pack 100 from rising to the over-temperature protection value and causing an overheating power-off operation.
  • the sweating temperature when the temperature of at least a part of the heat absorber 130 is greater than 40° C., sweating begins and heat is dissipated by evaporating water, that is, the sweating temperature is set to 40° C. In other embodiments, the sweating temperature can also be set to other temperatures, such as 45° C., 50° C., etc.
  • the ratio of the sweating volume of the heat absorber 130 to the capacity of the battery pack 100 is greater than or equal to 315 mm 3 /Ah and less than or equal to 630 mm 3 /Ah. In some embodiments, the ratio of the sweating volume of the heat absorber 130 to the capacity of the battery pack 100 may be 320 mm 3 /Ah, 400 mm 3 /Ah, 500 mm 3 /Ah, or 630 mm 3 /Ah.
  • the ratio of the volume of the heat absorber 130 to the discharge power of the battery pack 100 is greater than Equal to 25 mm 3 /W and less than or equal to 122 mm 3 /W. In some embodiments, the ratio of the volume of the heat absorber 130 to the discharge power of the battery pack 100 may be 30 mm 3 /W, 60 mm 3 /W, 100 mm 3 /W or 120 mm 3 /W.
  • the temperature drop value of the heat absorber 130 is 5.5° C.-10.7° C.
  • the temperature rise reduction percentage is 12%-24%.
  • the temperature of the battery cell assembly 120 decreases by 12% to 24%.
  • the temperature rate of the battery cell assembly 120 is 0.3°C/s-0.9°C/s.
  • the heat generation power of the battery cell flows in two paths: Path 1 is the heat absorbed by the battery cell itself, and Path 2 is the heat transfer to the components in the battery pack 100 and the external environment.
  • the battery cell assembly 120 includes a plurality of battery cell units 121, the battery cell units 121 are cylindrical lithium-ion batteries, and the plurality of battery cell units 121 are arranged in multiple rows and columns, so that the battery cell assembly 120 is in a cubic shape as a whole, and there are gaps between adjacent battery cell units 121.
  • the heat absorber 130 includes at least one heat absorbing sheet, which is a sheet structure made of hydrogel 133, and the heat absorbing sheet has a certain flexibility, and it can be deformed at the setting position.
  • the flexible heat absorbing sheet can be arranged between two adjacent rows of battery cell units 121, or between two adjacent columns of battery cell units 121, or placed on the outer end surface of the battery cell assembly 120.
  • the number of heat absorbing sheets is multiple, some of the multiple heat absorbing sheets can be placed between two adjacent rows or columns of battery cell units 121, or can be placed between the battery cell assembly 120 and the housing 110, so as to improve the heat absorption efficiency and the cooling effect on the battery cell assembly 120.
  • the heat absorbing sheet is a corrugated sheet, and the battery cell unit 121 is placed in the pit of the corrugated sheet. In this way, the contact area between the heat absorbing sheet and the battery cell unit 121 can be increased, thereby improving the heat absorption efficiency.
  • the heat absorbing sheet can also be in the shape of a flat plate, or in the shape of a support plate as shown in Figures 5 and 6.
  • the heat absorbing body 130 in the shape of a support plate includes a plate-like main body 131 and a filling tip 132 protruding from the plate-like main body 131.
  • the filling tip 132 can be arranged on one end surface of the plate-like main body 131, or on two opposite end surfaces of the plate-like main body 131.
  • the surface between the two filling tips 132 is a concave arc surface, and the cylindrical battery cell unit 121 can be placed between the two filling tips 132.
  • the filling tip 132 can be inserted into the gap formed between adjacent battery cell units 121, so as to improve the heat absorption efficiency while improving the support effect on the battery cell unit 121.
  • the battery cell assembly 120 includes a plurality of battery cell units 121, the battery cell units 121 are cylindrical lithium-ion battery cells, and the plurality of battery cell units 121 are stacked and arranged in a frustum shape, and two adjacent battery cell units 121 in the same row are adjacent to each other in the adjacent row.
  • the opposite battery cell unit 121 is arranged in a triangle.
  • the heat absorber 130 includes at least one heat absorbing sleeve, which is a ring-shaped structure made of hydrogel 133 and is sleeved on the battery cell unit 121.
  • the number of heat absorbing sleeves can be the same as the number of battery cell units 121, or different.
  • One battery cell unit 121 can be sleeved with one heat absorbing sleeve or multiple heat absorbing sleeves, and the number of heat absorbing sleeves can be selected according to actual needs.
  • a heat absorption sleeve in order to take into account both the heat absorption effect and the use cost, can be selected to cover at least the main heating area of the battery cell unit 121, wherein the main heating area is defined as an area extending from the middle position of the outer surface of the battery cell unit 121 to the positive end of the battery cell unit 121 to a set value.
  • the length of the battery cell 121 is about 65 mm, the diameter is about 18 mm, and the area where the temperature of the battery cell 121 rises fastest during charging and discharging is located in the middle of the outer surface of the battery cell 121 and 5 mm away from the positive end.
  • the area defined by the middle position A (about 32.5 mm) in the longitudinal direction of the battery cell 121 and extending 5 mm toward the positive end to the position B (about 37.5 mm) is the area where the temperature of the battery cell 121 rises most easily and quickly to the limit protection temperature. Therefore, in some embodiments, this area is selected as the main heating area of the battery cell 121, and the heat absorber 130 is mounted on this area.
  • the heat absorber 130 can also be mounted on the area defined by the position C (about 43.3 mm) extending from the middle position A (about 32.5 mm) in the longitudinal direction of the battery cell 121 to the positive end, which is two-thirds of the length of the entire battery cell 121 in the longitudinal direction, or the area defined by the position D (about 48.75 mm) extending from the middle position A (about 32.5 mm) in the longitudinal direction of the battery cell 121 to the positive end, which is three-quarters of the length of the entire battery cell 121 in the longitudinal direction.
  • these positions are selected as the main heating areas of the battery cell 121.
  • the ratio of the area of the main heating area to the area of the columnar surface of the battery cell 121 is 1:13-1:4.
  • the battery cell assembly 120 when the battery pack 100 is a soft pack battery, the battery cell assembly 120 includes a plurality of battery cell units 121, and the battery cell units 121 are sheet-shaped battery cells, and the plurality of battery cell units 121 are stacked. After the plurality of battery cell units 121 are stacked, the plurality of battery cell units 121 are integrally coated with a sealant, and after the sealant is fixed, a sealant layer 160 is formed that coats the entire battery cell assembly 120, and a sheet-shaped heat absorber 130 is attached to the sealant layer 160. In some embodiments, there are a plurality of heat absorbers 130, and they are attached to different sides of the sealant layer 160. In some specific embodiments, a heat insulating layer 170 is provided between two adjacent layers of battery cell units 121.
  • the ratio of the volume of the heat absorber 130 completely dehydrated to the volume of the heat absorber 130 after replenishing water is greater than or equal to 1 and less than or equal to 2.
  • the heat absorber is completely dehydrated by using a high temperature baking method. After the heat absorber 130 is left at room temperature for 24 hours, it is baked at a high temperature of 45°C (high temperature drying oven) for 8 hours. At this time, the heat absorber 130 is considered to be completely dehydrated.
  • the thickness of the heat absorber 130 is about 100 mm.
  • the density of the heat absorber 130 is 1.23 g/cm 3 .
  • the saturated water absorption of the heat absorber 130 is 35%.
  • the thermal conductivity of the heat absorber 130 is 0.5 W/m ⁇ K.
  • the total energy of the battery pack 100 is greater than or equal to 0.1 kW ⁇ h and less than or equal to 2 kW ⁇ h. In some embodiments, the total energy of the battery pack 100 is greater than or equal to 0.2 kW ⁇ h and less than or equal to 1 kW ⁇ h. In some embodiments, the total energy of the battery pack 100 is equal to 0.5 kW ⁇ h, 1 kW ⁇ h, 1.5 kW ⁇ h, or 2 kW ⁇ h.
  • the battery pack 100 also includes a first limit frame 140 and a second limit frame 150.
  • the first limit frame 140 and the second limit frame 150 are arranged in the accommodating cavity of the shell 110, and are distributed at both ends of the battery cell units 121 and the battery cell assembly 120 formed thereby. They are arranged in a plane extending vertically in the longitudinal direction of the multiple battery cell units 121.
  • the first limit frame 140 and the second limit frame 150 are used to support the multiple battery cell units 121 and the battery cell assembly 120 formed thereby, and fix the structure by mechanical means such as screws and clips to form the battery cell assembly 120 into a compact structure.
  • the first limit frame 140 and the second limit frame 150 can be made of heat-conducting materials, such as metal aluminum, silicon carbide, etc.
  • the first limit frame 140 and the second limit frame 150 are fixed together by mechanical means such as screws to encapsulate the battery cell assembly 120.
  • the first limit frame 140 and the second limit frame 150 are in full contact with the heat absorber 130, and can well conduct the heat generated by the battery cell unit 121 to achieve a good heat dissipation effect.
  • the battery pack 100 also includes electronic devices configured to perform internal and external control and protection measures, battery pack terminals connected to an external charger or power tool 10, and a cell unit connection mechanism.
  • the internal configurations such as the electronic devices configured to perform internal and external control and protection measures, the battery pack terminals connected to an external charger or power tool 10, and the cell unit connection mechanism are all common configurations, and therefore will not be described in detail in this specification and the drawings.
  • the present application also provides an electric tool 10, which includes a housing 110, a printed circuit board assembly and a heat absorber 130.
  • the printed circuit board assembly is arranged in the housing 110, and the heat absorber 130 is in thermal contact with at least part of the printed circuit board assembly to absorb the heat generated by the printed circuit board assembly.
  • the heat absorber 130 includes a hydrogel 133.
  • the electric tool 10 makes the heat absorber 130 in thermal contact with the printed circuit board assembly, and the hydrogel 133 included in the heat absorber 130 can absorb the heat generated during the operation of the printed circuit board assembly, and evaporates the water after reaching the sweating temperature, thereby achieving heat dissipation of the printed circuit board assembly, and the heat dissipation efficiency is high and the heat dissipation effect is good.
  • the printed circuit board assembly includes a printed circuit board and a heat conductor, and the heat conductor is disposed between the printed circuit board and the heat absorber 130.
  • the printed circuit board emits more heat due to the increase in power density, and the heat can be quickly transferred to the heat absorber 130 through the heat conductor, so that it is absorbed by the heat absorber 130.
  • the heat absorber 130 containing the hydrogel 133 has a good heat dissipation effect.
  • the thermal conductor is a layered structure, and the thermal conductor includes at least one of a thermal conductive silicone layer, a PET layer, a PU layer and an aluminum layer, wherein PET is commonly known as polyester resin; PU is also known as polyurethane, and its full name is polyurethane.
  • the thermal conductor is a single-layer structure, and the thermal conductor can be any one of a thermal conductive silicone layer, a PET layer, a PU layer and an aluminum layer; in another specific embodiment, the thermal conductor is a multi-layer structure, and the materials of adjacent layers can be the same or different, and each layer can be a thermal conductive silicone layer, a PET layer, a PU layer or an aluminum layer.
  • the thickness of the heat absorber 130 is greater than or equal to 0.2 mm and less than or equal to 3 mm. In some embodiments, the thickness of the heat absorber 130 can also be 0.6 mm, 1 mm, 1.5 mm, 2 mm or 3 mm.
  • the heat absorber 130 has a contact surface 135 and a sweating surface 134.
  • the contact surface 135 is in thermal contact with the heat conductor.
  • the sweating surface 134 sweats to dissipate heat when the temperature rises to the first target temperature, and absorbs moisture in the environment when the temperature drops to the second target temperature.
  • the second target temperature is lower than the first target temperature.
  • the first target temperature is the sweating temperature of the heat absorber 130.
  • the sweating temperature is set to 40°C. Of course, in other embodiments, the sweating temperature can also be set to other temperatures, such as 45°C, 50°C, and higher temperatures.
  • the second target temperature is the moisture absorption temperature of the heat absorber 130. In one embodiment, the moisture absorption temperature is set to 30°C, or 25 degrees, etc.
  • the setting of the first target temperature and the second target temperature in this application should be set based on the actual parameters of the battery pack 100 and the heat absorber 130.
  • the heat absorber 130 further has a shell structure, and the shell structure at least partially covers the sweating surface 134.
  • the housing 110 is formed with a vent, and at least part of the heat dissipation airflow entering the housing 110 from the vent contacts the heat absorber 130.
  • the vent and the heat absorber 130 are arranged opposite to each other, that is, in the vertical plane, the projection of the vent at least partially overlaps with the projection of the heat absorber 130.
  • the vent is a regular hole such as a rectangular hole or a circular hole, and can also be a special-shaped hole with higher aesthetics.
  • heat absorbers 130 there are two heat absorbers 130, one of which is in thermal contact with the printed circuit board assembly, and the other is in thermal contact with the motor of the power tool 10.
  • the motor will also generate a lot of heat during operation.
  • the temperature of the motor housing is high and the heat dissipation efficiency to the external environment is low.
  • the present application can absorb the heat dissipated by the motor, strengthen the heat dissipation of the motor, and thus avoid the overheating protection phenomenon of the motor.
  • the number of the heat absorbers 130 may be multiple, such as three, four, etc.
  • the heat absorber 130 may also be in thermal contact with other heat-generating components in the power tool 10 .
  • the power tool 10 further includes a heat absorber water replenishment structure, which is configured to provide water to the heat absorber 130.
  • the heat absorber 130 will inevitably lose water during the alternating process of sweating and absorbing moisture.
  • the power tool 10 further includes a heat absorber water replenishment structure, which can provide water to the heat absorber 130.
  • the heat absorber water replenishment structure is a water bag filled with water, and the water bag is connected to the heat absorber 130; in some embodiments, the heat absorber water replenishment structure is a moisture absorption device, and the moisture absorption device is at least configured to transfer moisture to the heat absorber 130, such as a capillary moisture absorption device, a two-way condensation control fiber layer, and a water collection structure disposed on the housing 110, and the water collection structure is a conical through hole.
  • the moisture absorbed by the moisture absorption device is water droplets condensed on the inner wall surface of the housing 110 from the moisture volatilized by the heat absorber 130.
  • the capillary hygroscopic device includes at least one capillary 180, one end of the capillary 180 is connected to the hydrogel 133, and the other end is placed on the inner wall surface of the shell 110, so that water condensed on the inner wall surface of the shell 110 can be input into the hydrogel 133 through the capillary 180.
  • the capillary hygroscopic device includes a plurality of capillaries 180 , which are independent of each other, one end of each capillary 180 is connected to the hydrogel 133 , and the other end is placed on the inner wall surface of the shell 110 .
  • the capillary moisture absorption device includes a plurality of capillaries 180, which are interconnected to form a tree-like structure, including a main capillary and a plurality of branch capillaries, one end of the main capillary is connected to the hydrogel 133, one end of the plurality of branch capillaries is connected to the other end of the main capillary, and the other end of the plurality of branch capillaries is connected to the hydrogel 133.
  • the moisture absorption and release process of the two-way condensation control fiber is opposite to that of the hydrogel 133.
  • the two-way condensation control fiber layer can absorb moisture when the hydrogel 133 evaporates, and can release moisture when the hydrogel 133 regenerates and absorbs water.
  • the hydrogel 133 begins to evaporate, the humidity around it increases, and the two-way condensation control fiber begins to absorb moisture; when the hydrogel 133 needs to regenerate and absorb water, the two-way condensation control fiber can release the moisture, always maintain a constant humidity in the environment, and accelerate the regeneration and absorption time of the hydrogel 133.
  • the size of the through-hole gradually decreases in the direction from the inner side of the shell 110 to the shell 110, thereby forming a tapered small hole.
  • the liquid on the surface of the shell 110 is discharged to the outside of the shell 110 and evaporated by utilizing the capillary action caused by the gradual reduction of the aperture.
  • This arrangement has two advantages: first, it reduces the impact of droplets in the battery pack 100 on the safety of the battery pack 100; second, the secondary evaporation of droplets on the outside can further enhance the heat dissipation effect.
  • there are multiple through-holes and the multiple through-holes are spaced apart on the shell 110. The provision of multiple through-holes is conducive to further improving the moisture absorption efficiency.
  • the present application also provides an electric tool 10, which includes a housing 110, a printed circuit
  • the printed circuit board assembly and the heat absorber 130 are arranged in the housing 110.
  • the heat absorber 130 includes a hydrogel 133.
  • the housing 110 includes a grip portion, and the heat absorber 130 is at least partially arranged in the grip portion.
  • the power tool 10 arranges the heat absorber 130 in the grip portion, and the hydrogel 133 included in the heat absorber 130 can absorb the heat at the grip portion, thereby reducing the temperature of the grip portion and improving the user's grip experience.
  • the thickness of the heat absorber 130 is greater than or equal to 0.2 mm and less than or equal to 3 mm. In a specific embodiment, the thickness of the heat absorber 130 is 0.6 mm; in a specific embodiment, the thickness of the heat absorber 130 is 1 mm; in a specific embodiment, the thickness of the heat absorber 130 is 2 mm; in a specific embodiment, the thickness of the heat absorber 130 is 3 mm.
  • the heat absorber 130 is disposed inside the housing 110. Placing the heat absorber 130 inside the housing 110 not only makes the heat absorber 130 closer to the heat source, absorbs heat faster, and is beautiful and not easy to fall off.
  • the housing 110 is formed with a vent, and at least part of the heat dissipation airflow entering the housing 110 from the vent is in thermal contact with the heat absorber 130.
  • the vent and the heat absorber 130 are arranged opposite to each other, that is, in a vertical plane, the projection of the vent at least partially overlaps with the projection of the heat absorber 130.
  • the vent is a regular hole such as a rectangular hole or a circular hole, and can also be a special-shaped hole with higher aesthetics.
  • the shape of the heat absorber 130 is adapted to the shape of at least part of the grip portion. That is, the heat absorber 130 has a shape similar to the grip portion, so that the heat absorber 130 can fit on the grip portion more perfectly, so that the temperature of each part of the grip portion is balanced, which is conducive to improving the user's grip experience.
  • the present application also provides a charging device, which is optionally a charger 300 for charging the battery pack 100, or an external charging device.
  • the charging device includes a housing 110, a printed circuit board assembly, and a heat absorber 130, wherein the printed circuit board assembly is disposed in the housing 110, and the heat absorber 130 is disposed in the housing 110, and the heat absorber 130 includes a hydrogel 133.
  • the power tool 10 is provided with the heat absorber 130 in the charging device, and the hydrogel 133 included in the heat absorber 130 can quickly absorb the heat generated by the charging device during the charging process, thereby reducing the temperature in the charging device and preventing the charging device from overheating.
  • the heat absorber 130 is in thermal contact with at least part of the printed circuit board assembly.
  • the charging device makes the heat absorber 130 in thermal contact with the printed circuit board assembly, and the hydrogel 133 included in the heat absorber 130 can absorb the heat generated during the operation of the printed circuit board assembly, and evaporate the water after reaching the sweating temperature, thereby achieving heat dissipation of the printed circuit board assembly, and the heat dissipation efficiency is high and the heat dissipation effect is good.
  • the printed circuit board assembly includes a printed circuit board and a heat conductor, and the heat conductor is disposed between the printed circuit board and the heat absorber 130.
  • the printed circuit board emits more heat due to the increase in power density, and the heat can be quickly transferred to the heat absorber 130 through the heat conductor and absorbed by the heat absorber 130.
  • the heat absorber 130 containing the hydrogel 133 has a good heat dissipation effect.
  • the charging device further includes a rectifier, and the heat absorber 130 is at least partially in thermal contact with the rectifier.
  • the charging device makes the heat absorber 130 in thermal contact with the rectifier, and the hydrogel 133 included in the heat absorber 130 can absorb the heat generated during the operation of the rectifier, and evaporate the water after reaching the sweating temperature, thereby achieving heat dissipation of the rectifier, and the heat dissipation efficiency is high and the heat dissipation effect is good.
  • the heat conductor is a layered structure, and the heat conductor includes at least one of a heat-conducting silicone layer, a PET layer, a PU layer, and an aluminum layer.
  • PET is commonly known as polyester resin
  • PU is also known as polyurethane, and its full name is polyurethane.
  • the thermal conductor is a single-layer structure, and the thermal conductor can be a thermal conductive silicone layer, a PET layer, a PU layer or an aluminum layer; in another specific embodiment, the thermal conductor is a multi-layer structure, and the materials of adjacent layers can be the same or different, and each layer can be a thermal conductive silicone layer, a PET layer, a PU layer or an aluminum layer.
  • the thickness of the heat absorber 130 is greater than or equal to 0.2 mm and less than or equal to 3 mm. In a specific embodiment, the thickness of the heat absorber 130 is 0.6 mm; in a specific embodiment, the thickness of the heat absorber 130 is 1 mm; in a specific embodiment, the thickness of the heat absorber 130 is 2 mm; in a specific embodiment, the thickness of the heat absorber 130 is 3 mm.
  • the charging device further includes a cooling fan, and the cooling airflow generated by the cooling fan at least partially passes through the heat absorber 130.
  • the cooling fan can speed up the flow of gas in the charging device, and the cooling effect of the heat absorber 130 can be improved by providing the cooling fan.
  • the present application also provides a heat dissipation structure, which is applied to an electric tool system.
  • the heat dissipation structure includes a shell 110 and a heat absorber 130.
  • the heat absorber 130 is arranged in the shell 110.
  • the heat absorber 130 includes a contact surface 135 and a sweating surface 134.
  • the heat absorber 130 includes a hydrogel 133.
  • the sweating surface 134 can be selectively sealed by the shell 110.
  • the housing 110 is a thermally conductive silicone shell, a PET shell, a PU shell or an aluminum shell.
  • the power tool 10 includes a handheld power tool 10 , a garden power tool 10 , a charger 300 , and a battery pack 100 .
  • the housing 110 has a selectively openable cover.
  • the present application also provides a heat dissipation structure, which is applied to an electric tool system.
  • the heat dissipation structure includes a shell 110, a heat absorber 130 and a moisture absorption device.
  • the heat absorber 130 is at least partially arranged in the shell 110.
  • the moisture absorption device is at least arranged to transfer moisture to the heat absorber 130.
  • the heat absorber 130 includes a hydrogel 133.
  • the desiccant device includes a capillary desiccant device, which includes at least one capillary 180, one end of the capillary 180 is connected to the hydrogel 133, and the other end is placed on the inner wall surface of the shell 110, so that water condensed on the inner wall surface of the shell 110 can be input into the hydrogel 133 through the capillary 180.
  • the capillary hygroscopic device includes a plurality of capillaries 180, the plurality of capillaries 180 are independent of each other, one end of each capillary 180 is connected to the hydrogel 133, and the other end is placed on the inner wall surface of the housing 110.
  • the capillary hygroscopic device includes a plurality of capillaries 180, the plurality of capillaries 180 are interconnected to form a tree structure, including a main capillary and a plurality of branch capillaries, one end of the main capillary is connected to the hydrogel 133, one end of the plurality of branch capillaries is connected to the other end of the main capillary, and the other end of the plurality of branch capillaries is connected to the hydrogel 133.
  • the desiccant device includes a plurality of through holes formed on the shell 110, and the size of the through holes gradually decreases in the direction from the inner side of the shell 110 to the shell 110.
  • the liquid on the surface of the shell 110 is discharged to the outside of the shell 110 and evaporated.
  • This arrangement has two advantages: first, it reduces the impact of droplets in the battery pack 100 on the safety of the battery pack 100; second, the secondary evaporation of droplets on the outside can further enhance the heat dissipation effect.
  • there are multiple through holes and the multiple through holes are spaced apart on the shell 110. The provision of multiple through holes is conducive to further improving the desiccant efficiency.
  • the moisture absorbing device includes a two-way condensation control fiber layer, which can absorb moisture when the hydrogel 133 evaporates, and can release moisture when the hydrogel 133 regenerates and absorbs water.
  • the moisture absorption and release process of the two-way condensation control fiber is opposite to that of the hydrogel 133.
  • the hydrogel 133 begins to evaporate, the humidity around it increases, and the two-way condensation control fiber begins to absorb moisture; when the hydrogel 133 needs to regenerate and absorb water, the two-way condensation control fiber can release the moisture, always maintain a constant humidity in the environment, and accelerate the regeneration and absorption time of the hydrogel 133.
  • the housing 110 is a thermally conductive silicone shell, a PET shell, a PU shell or an aluminum shell.
  • the power tool system includes a handheld power tool 10 , a garden power tool 10 , a charger 300 , and a battery pack 100 .
  • the housing 110 has a selectively openable cover.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Computer Hardware Design (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Abstract

一种电动工具、充电装置、电池包及散热结构。该电动工具(10)包括壳体(110)、印刷电路板组件和吸热体(130)，印刷电路板组件设置于壳体(110)内，吸热体(130)与至少部分印刷电路板组件热接触，设置为吸收印刷电路板组件产生的热量，吸热体(130)包括水凝胶(133)。

Description

电池包及电动工具系统
本申请要求在2022年10月21日提交中国专利局、申请号为202211294707.9、在2023年08月31日提交中国专利局、申请号为202311123845.5以及在2023年09月07日提交中国专利局、申请号为202322437140.2的中国专利申请的优先权，以上申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及一种散热结构，例如涉及一种电池包以及电动工具系统。
背景技术
相关技术中的电动工具是一种以电能为动力源且能够输出直线运动或者旋转运动的工具，电动工具的种类很多，例如砂光机、冲击钻、电扳手、割草机等，不同种类的电动工具被广泛应用于不同的使用场景，使用范围很广。
控制器是电动工具不可或缺的部件。随着电动工具功能的多样化，控制器的功率密度越来越高，而电动工具的紧凑化以及轻量化导致控制器散热速率下降，温升速度加快，从而使得电动工具因过温保护发生停机现象。
本部分提供了与本申请相关的背景信息，这些背景信息不一定是现有技术。
发明内容
本申请的一个目的是解决或至少减轻上述问题的一部分或者全部。为此，本申请的第一个目的在于提供了一种电池包及电动工具系统，以提高电动工具的散热效率。
本申请提供了一种适用于电动工具的电池包，包括：壳体；电芯组件，设置在壳体内，电芯组件包括至少一个电芯单元；吸热体，吸热体与电芯单元的至少部分热接触，吸热体被配置为吸收电芯组件在充放电过程中产生的热量；其中，吸热体包括水凝胶。
在一些实施例中，电芯组件包括至少两个电芯单元；吸热体至少部分设置在至少两个电芯单元之间。
在一些实施例中，多个电芯单元呈多行多列排布；吸热体包括至少一个吸热片，吸热片为由水凝胶制成的片状结构，吸热片设置在相邻两行或者相邻两列的电芯单元之间。
在一些实施例中，吸热体设置在电芯组件和壳体之间。
在一些实施例中，吸热体套设在电芯单元的外表面的至少一部分。
在一些实施例中，吸热体至少覆盖电芯单元的主要发热区域，主要发热区域为由电芯单元的外表面中间位置向电芯单元的正极端延伸设定值的区域。
在一些实施例中，电芯单元为柱状电芯。
在一些实施例中，吸热体彻底失水后的体积与吸热体补水后的体积的比值大于等于1且小于等于2。
在一些实施例中，吸热体的厚度大于等于0.5mm且小于等于2mm。
在一些实施例中，壳体形成有通风口，从通风口进入壳体内的散热气流的至少部分与吸热体接触。
在一些实施例中，电池包设置为为电动工具供电；电动工具包括手持式电动工具、台型工具或轮式电动工具。
在一些实施例中，电池包的总能量大于或等于0.1kW·h。
在一些实施例中，吸热体的发汗温度低于电池包的过温保护温度。
在一些实施例中，吸热体的体积与电池包的放电功率的比值为25mm3/W至122mm3/W。
在一些实施例中，其中，在吸热体的发汗面积与电芯组件的产热功率大于等于1.4cm2/W且小于等于3.5cm2/W的情况下，电芯组件的温度降低12％至24％。
一种电动工具系统，包括：壳体；印刷电路板组件，设置于壳体内；吸热体，设置于壳体；其中，吸热体包括水凝胶。
在一些实施例中，吸热体与至少部分印刷电路板组件热接触。
一种散热结构，应用于电动工具系统，散热结构包括：壳体；吸热体，至少部分设置在壳体内；吸湿装置，至少设置为传输水分至吸热体；吸热体包括水凝胶。
在一些实施例中，壳体为导热硅胶壳、聚对苯二甲酸乙二醇酯(Polyethylene Terephthalate，PET)壳、聚氨酯(Polyurethane，PU)壳或者铝壳。
在一些实施例中，电动工具系统包括手持式电动工具、花园电动工具、充电器、电池包。
附图说明
图1是本申请实施例提供的电动工具的结构立体图；
图2是本申请实施例提供的充电组合的结构立体图；
图3是本申请实施例提供的电池包的结构示意图；
图4是本申请实施例提供的电池包的一种爆炸图；
图5是本申请实施例提供的电池包的另一种爆炸图；
图6是本申请实施例提供的电池包中一组吸热体的结构示意图；
图7是本申请实施例提供的电池包的电芯组件以及吸热体的一种结构示意图；
图8是图7中吸热体覆盖电芯单元主要发热区域的示意图；
图9是本申请实施例提供的电池包的电芯组件与吸热体的另一种结构示意图；
图10是本申请实施例提供的吸热体的示意图；
图11是本申请实施例提供的毛细吸湿装置的一种结构的示意图；
图12是本申请实施例提供的毛细吸湿装置的另一种结构的示意图。
具体实施方式
在详细解释本申请的任何实施方式之前，应当理解，本申请不限于其应用到以下描述中阐述的或以上附图中所示的结构细节和组件布置。
在本申请中，术语“包括”、“包含”、“具有”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
在本申请中，术语“和/或”，是一种描述关联对象的关联关系，表示可以存在三种关系。例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“和/或”的关系。
本申请中，术语“连接”、“结合”、“耦合”、“安装”可以是直接连接、结合、耦合或安装，也可以是间接连接、结合、耦合或安装。其中，进行举例示范，直接连接指的是两个零件或组件之间不需设置中间件而连接在一起，间接连接指的是两个零件或组件分别与至少一个中间件连接，这两个零件或组件通过中间件实现连接。此外，“连接”和“耦合”不限于物理或机械连接或 耦合，并且可以包括电连接或耦合。
在本申请中，本领域普通技术人员将理解，结合数量或条件使用的相对术语(例如，“约”，“大约”，“基本”等)为包括所述值并且具有上下文所指示的含义。例如，该相对术语至少包括与特定值的测量相关的误差程度，与特定值相关的由制造，组装，使用造成的公差等。这种术语也应被视为公开了由两个端点的绝对值限定的范围。相对术语可指代所指示的值的一定百分比(例如1％，5％，10％或更多)的加或减。未采用相对术语的数值，也应该被揭示为具有公差的特定值。此外，“基本”在表达相对的角度位置关系时(例如，基本平行，基本垂直)，可指代在所指示的角度的基础上加或减一定度数(例如1度，5度，10度或更多)。
在本申请中，本领域普通技术人员将理解，由组件执行的功能可以为由一个组件，多个组件，一个零件，或多个零件执行。同样的，由零件执行的功能也可以由一个零件，一个组件，或多个零件组合来执行。
在本申请中，术语“上”、“下”、“左”、“右”、“前”、“后”等方位词是以附图所示的方位和位置关系来进行描述的，不应理解为对本申请实施例的限定。此外，在上下文中，还需要理解的是，当提到一个元件连接在另一个元件“上”或者“下”时，其不仅能够直接连接在另一个元件“上”或者“下”，也可以通过中间元件间接连接在另一个元件“上”或者“下”。还应当理解的，上侧、下侧、左侧、右侧、前侧、后侧等方位词不仅代表正方位，也可以理解为侧方位。例如，下方可以包括正下方、左下方、右下方、前下方以及后下方等。
在本申请中，术语“控制器”、“处理器”、“中央处理器”、“CPU”、“MCU”可以互换。在使用单元“控制器”、“处理器”、“中央处理器”、“CPU”、或“MCU”来执行特定功能，除非另有说明，否则这些功能则可以由单个上述单元或多个上述单元来执行。
在本申请中，术语“装置”、“模块”或“单元”为了实现特定的功能，它们可以通过硬件或软件的形式来实现。
在本申请中，术语“计算”、“判断”、“控制”、“确定”、“识别”等指的是计算机系统或类似电子计算设备(例如，控制器，处理器等)的操作和过程。
以下结合附图和具体实施例对本申请作介绍。
图1是本申请提供的电动工具的结构立体图，该电动工具10可以为一种电钻，至少能提供扭力辅助螺钉打入工件，并且可以提供冲击力冲击作业，以满 足用户不同的使用需求。实际上本申请中的技术方案可适用于电钻、电动扳手、电动螺丝批、电锤钻、电圆锯、砂光机等手持式电动工具，台锯等台型电动工具、打草机、电剪刀、修枝机、电锯等户外工具、以及载人式割草机、扫雪机、全地形车、电动摩托车等轮式电动工具。以下的实施例是本申请中的部分实施例，而不是全部的实施例。
电动工具10包括工具主体200和设置为给工具主体200提供电能的电池包100。在一些实施例中，电池包100采用包含水凝胶的吸热体130以吸收电池包100在放电过程中产生的热量，以实现电池包100的散热，如图4所示。在一些实施例中，电池包100可拆卸地连接至工具主体200以为电动工具10提供电能。在一些实施例中，电池包100设置在工具主体200内以为电动工具10提供电能。
图2是本申请提供的充电组合的结构立体图。充电组合20包括电池包100和设置为给电池包100充电的充电器300。在一些实施例中，电池包100采用包含水凝胶的吸热体130以吸收电池包100在充电过程中产生的热量，以实现电池包100的散热。
在一些实施例中，电池包100为可充电的锂化学电池，如锂离子电池，根据电动工具10使用场合的不同，电池包100可以为圆柱形锂电池或者软包电池。可充电的电池包100也可以配置为其他以锂为基质的锂化学电池，或者镍镉、镍氢之类的其他化学基质的可充电电池。电池包100可以是但不限于方形、筒形、塔形或其他形状等。电池包100还可以是磷酸铁锂电池。
如图3至图5所示，电池包100包括壳体110、电芯组件120和吸热体130。壳体110形成容纳腔，电芯组件120和吸热体130均设置在容纳腔内。在一些实施例中，壳体110包括上壳体111和下壳体112，上壳体111具有开口向下的上壳腔，下壳体112具有开口向上的下壳腔，上壳体111和下壳体112能够扣装在一起，上壳腔和下壳腔能够形成完整的容纳腔。在一些实施例中，壳体110也可以由左壳体和右壳体拼接形成。分体设计的壳体110易于组装，且易于加工制造。
电芯组件120包括至少一个电芯单元121，电芯单元121可进行充放电。电芯组件120包括一个电芯单元121或者包括多个电芯单元121，电芯单元121的数量取决于电池包100的不同额定标称值。不同标称值的电池包100可通过串联多个可充电的电芯单元121来实现。
吸热体130与电芯组件120的至少部分热接触。在一些实施例中，吸热体130与至少部分的电芯单元121热接触，以吸收电池包100在充放电过程中电芯组件120产生的热量。在一些实施例中，吸热体130包括水凝胶133。水凝胶133是以水为分散介质的凝胶，其具有网状交联结构的水溶性高分子中引入一部 分疏水基团和亲水残基，亲水残基与水分子结合，将水分子连接在网状内部，而疏水残基是遇水膨胀的交联聚合物。在一些实施例中，壳体110上形成有通风口，从通风口进入壳体110内的散热气流的至少部分与吸热体130接触，以提高散热效果，以及使作为吸热体130的水凝胶133能够从空气中吸收水分。
吸热体130和电芯单元121的热接触可以理解为吸热体130与电芯单元121的表面直接接触从而实现热传导，也可以理解为吸热体130与电芯单元121的表面不直接接触，而是通过热传导材料从而实现间接的热传导。上述的热传导材料可以是导热件，也可以是空气。吸热体130包括水凝胶133，可以理解为吸热体130是仅采用水凝胶133制成的单体吸热结构，也可以理解为吸热体130是由水凝胶133和其他吸热材料制成的混合吸热结构。
因电芯组件120内阻的存在，电动工具10在大电流放电时电芯组件120会产生大量的热量，仅靠自然气流散热无法满足电池包100的放电需求，若散热不及时，电池包100内因热量积聚会产生高温，从而对电池包100的寿命和安全性产生严重影响，本申请中的电池包100通过采用水凝胶133作为吸热体130的主要成分，利用水凝胶133能够吸收电芯组件120在充放电过程中产生的热量，并通过挥发水分进行散热。且水凝胶133在吸热过程中不会发生相变，仅体积缩小，而在电池包100不工作时水凝胶133又能够从空气中吸收水分，吸水后的水凝胶133体积增大，如此反复失水和吸水实现了反复吸热和循环使用。相较于发生相变的散热材料，水凝胶133在吸热时不会出现材料漏液以及材料流失的现象，从而提高了用户的使用体验以及电池包100的使用可靠性。
吸热体130的发汗温度低于电池包100的过温保护值，使得在电池包100发生过温保护前，吸热体130吸收的电池包100在充放电过程中电芯组件120产生的热量已经导致吸热体130温度上升至发汗温度，待吸热体130上升至发汗温度后，吸热体130开始进行水分挥发以对电池包100散热，从而使得电池包100的温度开始下降，从而避免电池包100上升至过热保护值而发生过热断电操作。
在一些实施例中，吸热体130的至少部分区域的温度大于40℃时开始发汗，并通过挥发水分进行散热，即发汗温度设置为40℃。在其他的实施例中，发汗温度还可以设置为其他温度，例如45℃、50℃等。
在一些实施例中，吸热体130的发汗体积与电池包100的容量的比值为大于等于315mm3/Ah且小于等于630mm3/Ah。在一些实施例中，吸热体130的发汗体积与电池包100的容量的比值可以为320mm3/Ah、400mm3/Ah、500mm3/Ah或者630mm3/Ah。
在一些实施例中，吸热体130的体积与电池包100的放电功率的比值大于 等于25mm3/W且小于等于122mm3/W。在一些实施例中，吸热体130的体积与电池包100的放电功率的比值可以为30mm3/W、60mm3/W、100mm3/W或者120mm3/W。
在吸热体130的发汗面积与产热功率满足上述条件时：吸热体130的温降值为5.5℃-10.7℃，温升降低百分比为12％-24％。
在一些实施例中，吸热体130的发汗面积与电芯组件120的产热功率大于等于1.4cm2/W且小于等于3.5cm2/W时，电芯组件120的温度降低12％至24％。电芯组件120的温度速率为0.3℃/s-0.9℃/s。
上述产热功率的定义为：电池包100不同放电倍率所对应的电芯产热功率，q＝I×I×R，I＝Q/T×C，其中，C：电芯放电倍率，Q：电池包容量，T1是小时。电芯产热功率流向有两条路径：路径1为电芯本身吸收热量，路径2为热量传递至电池包100内组件和外界环境。
如图4和图5所示，在一些实施例中，电芯组件120包括多个电芯单元121，电芯单元121为圆柱型锂离子电芯，多个电芯单元121呈多行多列排布，从而使电芯组件120整体呈立方体状，相邻电芯单元121之间具有间隙。吸热体130包括至少一个吸热片，吸热片为由水凝胶133制成的片状结构，吸热片具有一定的柔性，其能够在设置位置发生变形。当吸热片的数量为一个时，该具有柔性的吸热片能够设置在相邻两行电芯单元121之间，或者设置在相邻两列电芯单元121之间，或者置于电芯组件120的外端面上。当吸热片的数量为多个时，多个吸热片中的部分可以置于相邻两行或者两列电芯单元121之间，也可以置于电芯组件120和壳体110之间，以提高吸热效率和对电芯组件120的降温效果。
在一些实施例中，吸热片为波纹片，电芯单元121置于波纹片的凹坑内。如此可增大吸热片与电芯单元121的接触面积，从而提高吸热效率。在一些实施例中，吸热片也可以为平板状，或者为如图5和图6中所示的托板状，呈托板状的吸热体130包括板状主体131以及凸设在板状主体131上的填充尖部132，填充尖部132可以设置板状主体131的一个端面上，也可以设置在板状主体131相对的两个端面上。两个填充尖部132之间的表面为内凹的弧面，呈圆柱状的电芯单元121能够置于两个填充尖部132之间，填充尖部132能够插入相邻电芯单元121之间形成的间隙内，以在提高吸热效率的同时提高对电芯单元121的支撑效果。
除了图4和图5中所示结构外，在一些实施例中，也可以如图7所示，电芯组件120包括多个电芯单元121，电芯单元121为圆柱锂离子电芯，多个电芯单元121堆叠设置并呈锥台状，同一行中相邻的两个电芯单元121与相邻行中 正对的一个电芯单元121呈三角形排布。吸热体130包括至少一个吸热套，吸热套为由水凝胶133制成的环状结构，吸热套套设在电芯单元121上。吸热套的数量与电芯单元121的数量可以相同，也可以不同，一个电芯单元121上可以套设一个吸热套，也可以套设多个吸热套，吸热套的个数可以根据实际需要选择。
在一些实施例中，为了兼顾吸热效果和使用成本，可以选择利用吸热套至少覆盖电芯单元121的主要发热区域，其中，主要发热区域被定义在由电芯单元121的外表面中间位置向电芯单元121的正极端延伸设定值的区域。
在一些实施例中，如图8所示，电芯单元121的长度约为65mm，直径约为18mm，而电芯单元121在充放电时温升最快的区域位于电芯单元121的外表面中间且偏向正极端5mm的区域。也就是说，从电芯单元121的纵长方向的中间位置A(约32.5mm的位置)，向正极端延伸5mm到位置B(约37.5mm的位置)所定义的区域，为电芯单元121的温度上升最容易也是最快地达到极限保护温度的区域，因此，在一些实施例中，该区域被选为电芯单元121的主要发热区域，吸热体130套装在该区域上。
为达到更理想的散热效果，在一些实施例中，吸热体130还可以套装在从电芯单元121的纵长方向的中间位置A(约32.5mm的位置)，向正极端延伸更多的距离到达整个电芯单元121的纵长方向长度三分之二的位置C(约43.3mm的位置)所定义的区域，或者是从电芯单元121的纵长方向的中间位置A(约32.5mm的位置)，向正极端延伸更多的距离到达整个电芯单元121的纵长方向长度四分之三的位置D(约48.75mm的位置)所定义的区域，此时，这些位置被选为电芯单元121的主要发热区域。也就是说，主要发热区域的面积与电芯单元121的柱状面的面积的比值为1:13-1:4。
除了如图4、图5和图7中所示结构外，在一些实施例中，也可以如图9所示，当电池包100为软包电池时，电芯组件120包括多个电芯单元121，电芯单元121为片状电芯，多个电芯单元121层叠设置。多个电芯单元121完成层叠设置后，利用密封胶将多个电芯单元121整体包覆，待密封胶固定后形成将整个电芯组件120包覆的密封胶层160，并将呈片状的吸热体130贴附在密封胶层160上。在一些实施例中，吸热体130为多个，且贴附在密封胶层160的不同侧面上。在一些具体的实施例中，相邻两层电芯单元121之间设置有隔热层170。
在一些实施例中，吸热体130彻底失水的体积与吸热体130补水后的体积的比值为大于等于1且小于等于2。采用高温烘烤法使得吸热体彻底失水。将吸热体130在常温下静置24h后，再高温45℃烘烤(高温干燥箱)8小时，认为此时的吸热体130为彻底失水的状态。在一些实施例中，吸热体130的厚度为大 于等于0.5mm且小于等于2mm。在一些实施例中，吸热体130的密度为1.23g/cm3。在一些实施例中，吸热体130的饱和吸水量为35％。在一些实施例中，吸热体130的导热系数为0.5W/m·K。
在一些实施例中，电池包100的总能量大于或等于0.1kW·h且小于等于2kW·h。在一些实施例中，电池包100的总能量大于或等于0.2kW·h且小于等于1kW·h。在一些实施例中，电池包100的总能量等于0.5kW·h、1kW·h、1.5kW·h或者2kW·h。
继续参照图4和图5所示，电池包100还包括第一限位架140和第二限位架150，第一限位架140和第二限位架150设置在壳体110的容纳腔内，且分布在电芯单元121及其所形成的电芯组件120的两端部，在多个电芯单元121的纵长方向垂直延伸的平面内设置，第一限位架140和第二限位架150用以支撑多个电芯单元121及其所形成的电芯组件120，并通过螺钉、卡扣等机械方式固定结构，将电芯组件120形成一个紧凑的结构。
在一些实施例中，第一限位架140和第二限位架150可以由导热材料制成，如金属铝、碳化硅等，第一限位架140和第二限位架150通过螺钉等机械方式配合固定，将电芯组件120进行封装，第一限位架140和第二限位架150与吸热体130充分接触，可以很好的将电芯单元121产生的热传导出去，达到良好的散热效果。
此外，电池包100还包括设置为执行内外部控制和保护措施的电子器件、与外部充电器或电动工具10连接的电池包端子、以及电芯单元连接机构。执行内外部控制和保护措施的电子器件、与外部充电器或电动工具10连接的电池包端子、以及电芯单元连接机构等内部配置均为通用配置，因此在本说明书及附图中将不再赘述。
本申请还提供了一种电动工具10，该电动工具10包括壳体110、印刷电路板组件和吸热体130，印刷电路板组件设置于壳体110内，吸热体130与至少部分印刷电路板组件热接触，以吸收印刷电路板组件产生的热量，吸热体130包括水凝胶133。该电动工具10通过将吸热体130与印刷电路板组件热接触，吸热体130包括的水凝胶133能够将印刷电路板组件工作过程中产生的热量吸收，并在达到发汗温度后挥发水分，从而实现对印刷电路板组件的散热，且散热效率高，散热效果好。
在一些实施例中，印刷电路板组件包括印刷电路板和导热体，导热体设置于印刷电路板和吸热体130之间。印刷电路板因功率密度的提高散发出更多的热量，热量通过导热体能够快速传递至吸热体130上，从而被吸热体130吸收，包含有水凝胶133的吸热体130的散热效果好。
在一些实施例中，导热体为层状结构，导热体包括导热硅胶层、PET层、PU层和铝层中的至少一层，其中，PET，俗称涤纶树脂；PU，又称聚氨酯，全名为聚氨基甲酸酯。
在一些实施例中，导热体为单层结构，导热体可以为导热硅胶层、PET层、PU层以及铝层中的任何一种；在另一个具体地实施例中，导热体为多层结构，相邻层材质可以相同，也可以不同，每层均可为导热硅胶层、PET层、PU层或者铝层。
在一些实施例中，吸热体130的厚度大于等于0.2mm且小于等于3mm。在一些实施例中，吸热体130的厚度还可以为0.6mm、1mm、1.5mm、2mm或者3mm。
如图10所示，吸热体130具有接触面135和发汗面134，接触面135与导热体热接触，发汗面134在温度升高至第一目标温度时进行发汗散热，且在温度降低至第二目标温度时吸收环境中的水分。其中，第二目标温度低于第一目标温度。第一目标温度即为吸热体130的发汗温度，在一些实施例中，发汗温度设置为40℃。当然，在其他的实施例中，发汗温度还可以设置为其他温度，例如45℃、50℃以及更高的温度等。第二目标温度即为吸热体130的吸湿温度，在一个实施例中，吸湿温度设置为30℃、或者25度等。本申请中的第一目标温度和第二目标温度的设置应基于电池包100以及吸热体130的实际参数进行设置。
在一些实施例中，吸热体130还具有外壳结构，外壳结构至少部分覆盖发汗面134。为了进一步提高散热效率，在一些实施例中，壳体110形成有通风口，从通风口进入壳体110内的散热气流的至少部分与吸热体130接触。在一些具体的实施例中，通风口和吸热体130正对设置，即在竖直面内，通风口的投影与吸热体130的投影至少部分重叠。在一个具体的实施例中，通风口为矩形孔、圆孔等规则孔，也可以为美观度更高的异形孔。
吸热体130的数量为两个，其中一个吸热体130与印刷电路板组件热接触，另一个吸热体130与电动工具10的电机热接触。电机在工作过程中也会产生很多的热量，例如对于内转子电机来说，电机壳的温度较高且向外界环境散热效率低，而对于外转子电机来说，由于转速低，定子发热源在内部，散热困难，本申请通过在电机上设置吸热体130，能够对电机散热的热量进行吸热，强化电机散热，从而避免电机发生过热保护现象。
在其他的实施例中，吸热体130的数量还可以设置为多个，例如三个、四个等，吸热体130除了设置在印刷电路板组件和电机上外，还可以与电动工具10中的其他发热部件进行热接触。
电动工具10还包括吸热体补水结构，吸热体补水结构被设置为向吸热体130提供水分。吸热体130在发汗和吸湿交替进行过程中，不可避免地会产生水分损失，为了避免水分损失导致吸热体130的吸热效率大大折扣，该电动工具10还包括吸热体补水结构，该吸热体补水结构能够向吸热体130提供水分。
在一些实施例中，吸热体补水结构为盛有水的水囊，水囊与吸热体130连通；在一些实施例中，吸热体补水结构为吸湿装置，吸湿装置至少设置为传输水分至吸热体130，例如毛细吸湿装置、双向凝露控制纤维层以及设置在壳体110上的集水结构，集水结构为呈锥状的通孔。吸湿装置吸取的水分为吸热体130挥发出的水分在壳体110内壁面上凝结的水滴。
关于毛细吸湿装置，毛细吸湿装置包括至少一根毛细管180，毛细管180的一端与水凝胶133连接，另一端置于壳体110的内壁面处，使得冷凝在壳体110的内壁面上的水能够通过毛细管180输入水凝胶133内。
在一个实施例中，如图11所示，毛细吸湿装置包括多根毛细管180，多根毛细管180相互独立，每根毛细管180的一端均与水凝胶133连接，另一端均置于壳体110的内壁面处。
在另一个实施例中，如图12所示，毛细吸湿装置包括多根毛细管180，多根毛细管180相互连通呈树状结构，其包括主毛细管和多根分毛细管，主毛细管的一端与水凝胶133连接，多根分毛细管的一端均与主毛细管的另一端连通，多根分毛细管的另一端与水凝胶133连接。
关于双向凝露控制纤维层，例如湿度冷凝控制纤维(Humidity Condensation Control Fiber，HCCF)双向凝露控制纤维，双向凝露控制纤维的吸湿和放湿过程与水凝胶133相反，双向凝露控制纤维层能够在水凝胶133蒸发时吸收水分，并能够在水凝胶133再生吸水时释放水分。也就是说，当水凝胶133开始蒸发时，其周围湿度增加，双向凝露控制纤维开始吸收水分；当水凝胶133需要再生吸水时，双向凝露控制纤维可以将水分释放出来，始终维持环境恒定湿度，加快水凝胶133再生吸水时间。
关于呈锥状的通孔，通孔的尺寸在壳体110的内侧指向壳体110的方向上逐渐减小，从而形成为渐缩式小孔。利用孔径逐渐缩小产生的毛细作用，将壳体110表面液体排放至壳体110外侧蒸发掉。如此设置有两个好处：第一、减小电池包100内液滴对电池包100安全性产生影响；第二、液滴在外侧二次蒸发可以进一步提升散热效果。在一些实施例中，通孔的数量为多个，多个通孔在壳体110上间隔设置，设置多个通孔利于进一步提高吸湿效率。
本申请还提供了一种电动工具10，该电动工具10包括壳体110、印刷电路 板组件和吸热体130，印刷电路板组件设置于壳体110内，吸热体130包括水凝胶133，壳体110包括握持部，吸热体130至少部分设置于握持部。该电动工具10通过将吸热体130设置握持部，吸热体130包括的水凝胶133能够将握持部处的热量吸收，从而使得握持部的温度下降，提高用户的握持体验。
在一些实施例中，吸热体130的厚度大于等于0.2mm且小于等于3mm。在一个具体地实施例中，吸热体130的厚度为0.6mm；在一个具体地实施例中，吸热体130的厚度为1mm；在一个具体地实施例中，吸热体130的厚度为2mm；在一个具体地实施例中，吸热体130的厚度为3mm。
在一个实施例中，吸热体130设置于壳体110内侧。将吸热体130设置在壳体110内侧不仅使得吸热体130距离热源距离更近，吸热热量的速度更快，并且美观，不易脱离。
在一个实施例中，壳体110形成有通风口，从通风口进入壳体110内的散热气流的至少部分与吸热体130热接触。在一些具体的实施例中，通风口和吸热体130正对设置，即在竖直面内，通风口的投影与吸热体130的投影至少部分重叠。在一个具体的实施例中，通风口为矩形孔、圆孔等规则孔，也可以为美观度更高的异形孔。
在一个实施例中，吸热体130的形状与握持部至少部分的形状适配。即吸热体130具有与握持部相似的形状，使得吸热体130能够较为完美地贴合在握持部上，使得握持部每处的温度均衡，利于提高用户的握持体验。
本申请还提供了一种充电装置，可选地，充电装置为给电池包100充电的充电器300，或者外部充电器件。充电装置包括壳体110、印刷电路板组件和吸热体130，印刷电路板组件设置于壳体110内，吸热体130设置于壳体110，吸热体130包括水凝胶133。该电动工具10通过将吸热体130设置于充电装置，吸热体130包括的水凝胶133能够将充电装置在充电过程中产生的热量快速吸收，从而使得充电装置内温度下降，避免充电装置发生过热现象。
在一些实施例中，吸热体130与至少部分印刷电路板组件热接触。该充电装置通过将吸热体130与印刷电路板组件热接触，吸热体130包括的水凝胶133能够将印刷电路板组件工作过程中产生的热量吸收，并在达到发汗温度后挥发水分，从而实现对印刷电路板组件的散热，且散热效率高，散热效果好。
在一些实施例中，印刷电路板组件包括印刷电路板和导热体，导热体设置于印刷电路板和吸热体130之间。印刷电路板因功率密度的提高散发出更多的热量，通过导热体热量能够快速传递至吸热体130上并被吸热体130吸收，包含有水凝胶133的吸热体130的散热效果好。
在一些实施例中，充电装置还包括整流器，吸热体130至少部分与整流器热接触。该充电装置通过将吸热体130与整流器热接触，吸热体130包括的水凝胶133能够将整流器工作过程中产生的热量吸收，并在达到发汗温度后挥发水分，从而实现对整流器的散热，且散热效率高，散热效果好。
在一些实施例中，导热体为层状结构，导热体包括导热硅胶层、PET层、PU层和铝层中的至少一层。其中，PET，俗称涤纶树脂，PU，又称聚氨酯，全名为聚氨基甲酸酯。
在一个具体地实施例中，导热体为单层结构，导热体可以为导热硅胶层、PET层、PU层或者铝层；在另一个具体地实施例中，导热体为多层结构，相邻层材质可以相同，也可以不同，每层均可为导热硅胶层、PET层、PU层或者铝层。
在一些实施例中，吸热体130的厚度大于等于0.2mm且小于等于3mm。在一个具体地实施例中，吸热体130的厚度为0.6mm；在一个具体地实施例中，吸热体130的厚度为1mm；在一个具体地实施例中，吸热体130的厚度为2mm；在一个具体地实施例中，吸热体130的厚度为3mm。
在一些实施例中，充电装置还包括散热风扇，散热风扇产生的散热气流至少部分经过吸热体130。散热风扇工作能够加快气体在充电装置内的流动速度，通过设置散热风扇能够提高吸热体130的散热效果。
本申请还提供了一种散热结构，该散热结构应用于电动工具系统，散热结构包括壳体110和吸热体130，吸热体130设置在壳体110内，吸热体130包括接触面135和发汗面134，吸热体130包括水凝胶133，发汗面134由壳体110可选择性的密封。
在一些实施例中，壳体110为导热硅胶壳、PET壳、PU壳或者铝壳。
在一些实施例中，电动工具10包括手持式电动工具10、花园电动工具10、充电器300、电池包100。
在一些实施例中，壳体110具有可选择性打开的盖体。
本申请还提供了一种散热结构，该散热结构应用于电动工具系统，散热结构包括壳体110、吸热体130和吸湿装置，吸热体130至少部分设置在壳体110内，吸湿装置至少设置为传输水分至吸热体130，吸热体130包括水凝胶133。
在一些实施例中，吸湿装置包括毛细吸湿装置，毛细吸湿装置包括至少一根毛细管180，毛细管180的一端与水凝胶133连接，另一端置于壳体110的内壁面处，使得冷凝在壳体110的内壁面上的水能够通过毛细管180输入水凝胶133内。
在一个实施例中，毛细吸湿装置包括多根毛细管180，多根毛细管180相互独立，每根毛细管180的一端均与水凝胶133连接，另一端均置于壳体110的内壁面处。在另一个实施例中，毛细吸湿装置包括多根毛细管180，多根毛细管180相互连通呈树状结构，其包括主毛细管和多根分毛细管，主毛细管的一端与水凝胶133连接，多根分毛细管的一端均与主毛细管的另一端连通，多根分毛细管的另一端与水凝胶133连接。
在一些实施例中，吸湿装置包括形成在壳体110上的多个通孔，通孔的尺寸在壳体110的内侧指向壳体110的方向上逐渐减小。利用孔径逐渐缩小的毛细作用，将壳体110表面液体排放至壳体110外侧蒸发掉。如此设置有两个好处：第一、减小电池包100内液滴对电池包100安全性产生影响；第二、液滴在外侧二次蒸发可以进一步提升散热效果。在一些实施例中，通孔的数量为多个，多个通孔在壳体110上间隔设置，设置多个通孔利于进一步提高吸湿效率。
在一些实施例中，吸湿装置包括双向凝露控制纤维层，双向凝露控制纤维层能够在水凝胶133蒸发时吸收水分，并能够在水凝胶133再生吸水时释放水分。双向凝露控制纤维的吸湿和放湿过程与水凝胶133相反，当水凝胶133开始蒸发时，其周围湿度增加，双向凝露控制纤维开始吸收水分；当水凝胶133需要再生吸水时，双向凝露控制纤维可以将水分释放出来，始终维持环境恒定湿度，加快水凝胶133再生吸水时间。
在一些实施例中，壳体110为导热硅胶壳、PET壳、PU壳或者铝壳。
在一些实施例中，电动工具系统包括手持式电动工具10、花园电动工具10、充电器300、电池包100。
在一些实施例中，壳体110具有可选择性打开的盖体。
以上显示和描述了本申请的基本原理、主要特征和优点。本行业的技术人员应该了解，上述实施例不以任何形式限制本申请，凡采用等同替换或等效变换的方式所获得的技术方案，均落在本申请的保护范围内。

Claims (20)

  1. 一种适用于电动工具的电池包，包括：
    壳体；
    电芯组件，设置在所述壳体内，所述电芯组件包括至少一个电芯单元；
    吸热体，所述吸热体与所述电芯单元的至少部分热接触，所述吸热体被配置为吸收所述电芯组件在充放电过程中产生的热量；
    其中，所述吸热体包括水凝胶。
  2. 根据权利要求1所述的电池包，其中，所述电芯组件包括至少两个所述电芯单元；所述吸热体至少部分设置在至少两个所述电芯单元之间。
  3. 根据权利要求2所述的电池包，其中，多个所述电芯单元呈多行多列排布；所述吸热体包括至少一个吸热片，所述吸热片为由所述水凝胶制成的片状结构，所述吸热片设置在相邻两行或者相邻两列的所述电芯单元之间。
  4. 根据权利要求1所述的电池包，其中，所述吸热体设置在所述电芯组件和所述壳体之间。
  5. 根据权利要求1所述的电池包，其中，所述吸热体套设在所述电芯单元的外表面的至少一部分。
  6. 根据权利要求5所述的电池包，其中，所述吸热体至少覆盖所述电芯单元的主要发热区域，所述主要发热区域为由所述电芯单元的外表面中间位置向所述电芯单元的正极端延伸设定值的区域。
  7. 根据权利要求6所述的电池包，其中，所述电芯单元为柱状电芯。
  8. 根据权利要求1所述的电池包，其中，所述吸热体彻底失水后的体积与所述吸热体补水后的体积的比值大于等于1且小于等于2。
  9. 根据权利要求1所述的电池包，其中，所述吸热体的厚度大于等于0.5mm且小于等于2mm。
  10. 根据权利要求1所述的电池包，其中，所述壳体形成有通风口，从所述通风口进入所述壳体内的散热气流的至少部分与所述吸热体接触。
  11. 根据权利要求1所述的电池包，其中，所述电池包设置为为电动工具供电；所述电动工具包括手持式电动工具、台型工具或轮式电动工具。
  12. 根据权利要求1所述的电池包，其中，所述电池包的总能量大于或等于0.1kW·h。
  13. 根据权利要求1所述的电池包，其中，所述吸热体的发汗温度低于所述电池包的过温保护温度。
  14. 根据权利要求1所述的电池包，其中，所述吸热体的体积与所述电池包的放电功率的比值为25mm3/W至122mm3/W。
  15. 根据权利要求1所述的电池包，其中，在所述吸热体的发汗面积与所述电芯组件的产热功率大于等于1.4cm2/W且小于等于3.5cm2/W的情况下，所述电芯组件的温度降低12％至24％。
  16. 一种电动工具系统，包括：
    壳体；
    印刷电路板组件，设置于所述壳体内；
    吸热体，设置于所述壳体；
    其中，所述吸热体包括水凝胶。
  17. 根据权利要求16所述的电动工具系统，其中，所述吸热体与至少部分所述印刷电路板组件热接触。
  18. 一种散热结构，应用于电动工具系统，所述散热结构包括：
    壳体；
    吸热体，至少部分设置在所述壳体内；
    吸湿装置，设置为传输水分至所述吸热体；
    所述吸热体包括水凝胶。
  19. 根据权利要求18所述的散热结构，其中，所述壳体为导热硅胶壳、聚对苯二甲酸乙二醇酯PET壳、聚氨酯PU壳或者铝壳。
  20. 根据权利要求18所述的散热结构，其中，所述电动工具系统包括手持式电动工具、花园电动工具、充电器、电池包。
PCT/CN2023/125159 2022-10-21 2023-10-18 电池包及电动工具系统 Ceased WO2024083143A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP23879131.3A EP4576329A4 (en) 2022-10-21 2023-10-18 BATTERY PACK AND POWER TOOL SYSTEM
US19/087,781 US20250219191A1 (en) 2022-10-21 2025-03-24 Battery pack and power tool system

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN202211294707.9 2022-10-21
CN202211294707 2022-10-21
CN202311123845.5 2023-08-31
CN202311123845 2023-08-31
CN202322437140.2U CN221687602U (zh) 2022-10-21 2023-09-07 电池包及电动工具
CN202322437140.2 2023-09-07

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US19/087,781 Continuation US20250219191A1 (en) 2022-10-21 2025-03-24 Battery pack and power tool system

Publications (1)

Publication Number Publication Date
WO2024083143A1 true WO2024083143A1 (zh) 2024-04-25

Family

ID=90736985

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/125159 Ceased WO2024083143A1 (zh) 2022-10-21 2023-10-18 电池包及电动工具系统

Country Status (3)

Country Link
US (1) US20250219191A1 (zh)
EP (1) EP4576329A4 (zh)
WO (1) WO2024083143A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118659084A (zh) * 2024-08-19 2024-09-17 涿州市柯林电子产品有限公司 一种新型电池包及其制造方法
CN119057839A (zh) * 2024-11-01 2024-12-03 卧龙电气驱动集团股份有限公司 驱动装置、驱控方法以及机器人

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150101786A1 (en) * 2013-10-10 2015-04-16 Helamia LLC Cooling Gel Pad
CN106257739A (zh) * 2015-12-18 2016-12-28 上海卡耐新能源有限公司 一种蓄电池模块及其制作方法
CN106953137A (zh) * 2017-04-12 2017-07-14 厦门金龙联合汽车工业有限公司 一种利用水凝胶增强电池模组散热的方法
CN114744331A (zh) * 2022-04-08 2022-07-12 香港科技大学 一种用于锂离子电池的复合散热薄膜及其制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7270910B2 (en) * 2003-10-03 2007-09-18 Black & Decker Inc. Thermal management systems for battery packs
WO2015079840A1 (ja) * 2013-11-26 2015-06-04 日立工機株式会社 電池パック及び電動工具及び充電器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150101786A1 (en) * 2013-10-10 2015-04-16 Helamia LLC Cooling Gel Pad
CN106257739A (zh) * 2015-12-18 2016-12-28 上海卡耐新能源有限公司 一种蓄电池模块及其制作方法
CN106953137A (zh) * 2017-04-12 2017-07-14 厦门金龙联合汽车工业有限公司 一种利用水凝胶增强电池模组散热的方法
CN114744331A (zh) * 2022-04-08 2022-07-12 香港科技大学 一种用于锂离子电池的复合散热薄膜及其制备方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4576329A4

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118659084A (zh) * 2024-08-19 2024-09-17 涿州市柯林电子产品有限公司 一种新型电池包及其制造方法
CN118659084B (zh) * 2024-08-19 2025-02-28 涿州市柯林电子产品有限公司 一种新型电池包及其制造方法
CN119057839A (zh) * 2024-11-01 2024-12-03 卧龙电气驱动集团股份有限公司 驱动装置、驱控方法以及机器人

Also Published As

Publication number Publication date
US20250219191A1 (en) 2025-07-03
EP4576329A1 (en) 2025-06-25
EP4576329A4 (en) 2025-11-19

Similar Documents

Publication Publication Date Title
US20250219191A1 (en) Battery pack and power tool system
EP2438640B1 (en) Lithium ion battery pack having passive cooling
CN100495808C (zh) 二次电池模件
CN104241730B (zh) 具有散热系统的电池包
JP3764332B2 (ja) 電池パック
US20070292751A1 (en) Battery Apparatus with Heat Absorbing Body
CN209804849U (zh) 一种基于相变材料的双电池组散热装置
CN108777336B (zh) 锂电池包热管理系统
CN2927335Y (zh) 具有吸热体的电池装置
CN115036610A (zh) 用于电池的冷却方法和冷却系统
WO2018094904A1 (zh) 带吸热套的电池组和具有该电池组的动力电池
CN207320173U (zh) 一种带有均热功能的方形电池
KR100658626B1 (ko) 이차 전지 모듈
CN221687602U (zh) 电池包及电动工具
CN205811009U (zh) 一种动力电池系统
CN107157404A (zh) 吸尘器的电池包及吸尘器
CN206180061U (zh) 一种电池模组结构
CN215451594U (zh) 一种电池模组和两轮车
CN220209077U (zh) 一种电池散热装置
CN221304788U (zh) 二次电池
CN209329094U (zh) 一种电池散热组件及锂电池
CN116169392B (zh) 电池包及电动工具
WO2023093543A1 (zh) 电池包及电动工具
CN217589100U (zh) 一种电池模组
US20240304887A1 (en) Thermal management of a battery module and of a battery pack

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23879131

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023879131

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2023879131

Country of ref document: EP

Effective date: 20250318

NENP Non-entry into the national phase

Ref country code: DE

WWP Wipo information: published in national office

Ref document number: 2023879131

Country of ref document: EP