SE544853C2 - Cooling of a Battery Pack in a System Comprising a Tool, a Battery Pack and a Charger - Google Patents

Cooling of a Battery Pack in a System Comprising a Tool, a Battery Pack and a Charger

Info

Publication number
SE544853C2
SE544853C2 SE2150140A SE2150140A SE544853C2 SE 544853 C2 SE544853 C2 SE 544853C2 SE 2150140 A SE2150140 A SE 2150140A SE 2150140 A SE2150140 A SE 2150140A SE 544853 C2 SE544853 C2 SE 544853C2
Authority
SE
Sweden
Prior art keywords
battery pack
tool
battery
housing
opening
Prior art date
Application number
SE2150140A
Other languages
Swedish (sv)
Other versions
SE2150140A1 (en
Inventor
Anders Gidoff
Glenn Torsténi
Original Assignee
Husqvarna Ab
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
Application filed by Husqvarna Ab filed Critical Husqvarna Ab
Priority to SE2150140A priority Critical patent/SE544853C2/en
Priority to JP2023547771A priority patent/JP7646849B2/en
Priority to CN202280010469.6A priority patent/CN116802962A/en
Priority to PCT/SE2022/050114 priority patent/WO2022173347A1/en
Priority to AU2022219714A priority patent/AU2022219714A1/en
Priority to EP22753061.5A priority patent/EP4292192A4/en
Priority to US18/276,348 priority patent/US20240113351A1/en
Publication of SE2150140A1 publication Critical patent/SE2150140A1/en
Publication of SE544853C2 publication Critical patent/SE544853C2/en

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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H01M10/65—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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/70—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/731—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries characterised by the mechanical construction specially adapted for holding portable devices containing batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/70—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/751—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/10—Temperature sensitive devices
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Selective Calling Equipment (AREA)

Abstract

The present disclosure relates to a battery-operated system comprising a tool 1, a battery pack 3 configured to power the tool by being inserted in a tool socket 5 of the tool, and a charger 7, comprising a charger socket 9 for charging the battery pack 3. The battery pack 3 has a housing 11 and a cooling channel 13 extending from a first 15 to a second 17 opening in the housing. The tool 1 comprises a fan arrangement 19 for cooling the battery pack 3 during use by forcing air from the first 15 to the second 17 opening in the battery pack housing 11, and the charger 7 comprising a fan arrangement 21 for cooling the battery pack 3 during charging but instead forcing air from the second 17 to the first 15 opening in the battery pack housing 11. This means that a battery cell that may become the hottest during discharging is cooled at ambient temperature during charging meaning that full charging can be attained faster.

Description

Technical field The present disclosure relates to a battery-operated system comprising a tool, a battery pack configured to power said tool by being inserted in a tool socket of the tool, and a charger, comprising a charger socket for charging said battery pack.
Background Such battery-operated systems are widely used as an alternative to tools with combustion engines and tools connected to power outlets by means of a cord. Thereby, flexible, cordless use is provided without exhaust emissions. Several battery packs can be used to allow more or less continuous use of the tool, for instance. A battery pack can also be used in several different tools.
One problem associated with battery-operated systems of this kind is how to obtain efficient charging of discharged battery packs to, for instance, reduce the waiting time until the battery pack is fully charged or at least useable again.
Summary One object of the present disclosure is therefore to obtain more efficient charging of a battery pack in a battery-operated system. This object is achieved, in a system of the initially mentioned kind wherein the battery pack comprises a housing and a cooling channel extending from a first to a second opening in the housing. The tool com- prises a fan arrangement for cooling the battery pack, during use, by forcing air from the first to the second opening in the battery pack housing. The charger comprises a fan arrangement for cooling the battery pack during charging by forcing air from the second to the first opening in the battery pack housing.
This makes it possible to charge the battery pack at high power sooner after use. During use, the discharging of the battery pack makes it develop heat. This heat is cooled off by the fan arrangement in the tool. The cell closest to the air inlet in the battery pack receives the best cooling from the ambient air. Cells further downstream receive to some extent pre-heated air and are cooled less efficiently. The cell closest to the outlet will therefore likely reach the highest temperature. When the battery pack is moved to the charger, the hottest cell will limit the charging. Thanks to thereversing of the air flow in the charger compared to in the tool, the hotter cells now however are cooled more efficiently as they receive ambient rather than pre-heated air. Therefore, the hottest cells more quickly reach a temperature where more efficient charging can take place. Hence, charging at high power can commence more quickly leading to an overall more efficient recharging of the battery pack.
The battery pack may comprise a plurality of battery cells and temperature sensors may be provided both at the battery cell closest to the first opening and the battery cell closest to the second opening. Thereby, the temperature of the hottest battery cell may be determined both during charging and discharging.
The tool may comprise an implement motor and, if so, the fan arrangement may be driven by the implement motor and may in some cases even be attached to the implement motor shaft.
The present disclosure further considers a method for operating a battery-operated system having a tool, a battery pack configured to power the tool, and a charger, for charging the battery pack. The battery pack comprises a housing and a cooling channel extending from a first to a second opening in the housing. The disclosed method includes cooling the battery pack during use thereof by forcing air from the first to the second opening in the battery pack housing. During charging the battery pack is cooled by forcing air from the second to the first opening in the battery pack housing. This provides the above-mentioned advantages regardless of the location of the used fan arrangements. Brief description of the drawinqs Fig 1 illustrates schematically and in cross-section a battery pack for a battery- operated system. Fig 2A shows the battery pack when used in a battery-operated power cutter.
Fig 2B shows the battery pack inserted in a charger.
Detailed description The present disclosure relates generally to battery-operated systems where a battery pack is used intermittently in a tool and is then released from the tool to be recharged in a charger. A system of this kind may use a plurality of such battery packs that may be used to power tools of different kinds, power cutters being only one example. One example of a battery pack for a battery-operated system is illustrated schematically and in cross-section in fig The battery pack 3 comprises a housing 11 that encloses a plurality of battery cells 31, 33, 35 each functioning as an energy storing unit and which can be connected in parallel or in series using charging electronics (not shown) for charging and discharging. During charging and discharging of the battery cells 31, 33, 35 in the battery pack they develop heat, and their temperatures should be limited to improve efficiency and to avoid that electronics in the battery pack and the cells themselves are damaged due to excessive temperatures.
To this end, cooling features are provided in the battery pack 3. The housing 11 is provided with a first 15 and a second 17 opening, and there is formed a cooling channel 13 therebet\Neen such that air can travel from the first opening 15 to the second opening 17 or vice versa thereby passing and cooling the battery cells 31, 33, 35 if they are at a higher temperature than the ambient air. Air can be forced through this cooling channel 13 both during charging and discharging of the battery pack 3. Then, a fan arrangement 21, 19 in the charger 7 and in the tool 1, respectively, may be used to obtain the desired cooling flow passing the battery cells 31, 33, ln the present disclosure, the overall efficiency of the battery-operated system is improved by reversing the direction of the air flow during charging compared to the direction of the air flow during discharging. Fig 2A shows the battery pack 3 when used in a tool in the form of a battery-operated power cutter 1, inserted in a socket 5 thereof. The tool 1 comprises a fan arrangement 19 for cooling the battery pack 3 during use. The fan arrangement 19 of the power cutter cools the battery pack by forcing air through the cooling channel 13 thereof. Then, air is forced from the first opening 15 to the second opening 17 in the battery pack housing 11, i.e. from the right to the left in the drawing of fig 1, or in the direction of the indicated arrow. This means that the battery cell 35 to the right receives the most efficient cooling as it is hit by ambient temperature air (ambient with respect to the battery pack housing 11). The following cells 33, 31 receive increasingly hotter air as the air flow then has been heated by the cell or cells upstream. Therefore, when the power cutter 1 or other tool has been powered for some time the battery cell 31 to the left will be considerably hotter than the battery cell 35 to the right. When the battery pack 3 is moved to be inserted in a socket 9 of a charger 7 and charging is about to commence, a too hot battery cell may limit the possible charging, such that only a reduced charging is allowed or that charging must wait until a suitable battery cell temperature is reached. lt should be noted that the battery pack 3 of a power tool may have a capacity of 300Wh or more and deliver power to tools in the range 2-5kW. Thus, very high levels of power are handled. ln the present disclosure, the charger 7 also comprises a fan arrangement 21 for cooling the battery pack 3 during charging by forcing air through the cooling channel 13. Fig 2B shows the battery pack 3 inserted in the socket 9 of a charger 7. The direction of the cooling flow is however reversed, running from the second 17 to the first 15 opening in the battery pack housing 11, i.e. the direction opposite to the arrow of fig 1. This means that the hottest battery cell 31 will receive the coolest air at ambient temperature while the subsequent battery cells 33, 35 will receive successively hotter air, heated by the battery cell or cells 31, 33 upstream in the cooling flow. This however need not imply a problem as those battery cells 33, 35 are likely cooled from a lower initial temperature. Thereby, charging of the battery packcan commence sooner and/or can be carried out at a higher charging power.
Returning to fig 1, the battery pack may comprise a temperature sensor 43 at the battery cell 31 closest to the second opening in the housing 11 as well as one 45 at the battery cell 35 closest to the first opening 15. Thereby, it is possible both during charging and powering of the tool to determine the highest battery cell temperature using a control unit 41 which may be located in the battery pack and/or in the tool or charger.
The present disclosure is not restricted to the above examples and may be varied and altered in different ways within the scope of the appended claims. For instance, several other tools than circular power cutters can be considered, such as chain saws, leaf blowers, trimmers, etc.

Claims (6)

1. 1. A battery operated system comprising a tool (1), a battery pack (3) configured to power said tool by being inserted in a tool socket (5) of the tool, and a charger (7), comprising a charger socket (9) for charging said battery pack (3), characterised by: -the battery pack (3) comprising a housing (11) and a cooling channel (13) extending from a first (15) to a second (17) opening in the housing -the tool (1) comprising a fan arrangement (19) for cooling the battery pack (3) during use by forcing airfrom the first (15) to the second (17) opening in the battery pack housing (11), and -the charger (7) comprising a fan arrangement (21) for cooling the battery pack (3) during charging by forcing air from the second (17) to the first (15) opening in the battery pack housing (11).
2. Battery operated system according to claim 1, wherein the battery pack (3) comprises a plurality of battery cells (31, 33, 35) and temperature sensors (43, 45) are provided both at the battery cell (35) closest to the first opening (15) and the battery cell (31) closest to the second opening (17).
3. Battery operated system according to claim 1 or 2, wherein the tool comprises an implement motor and the fan arrangement (19) is driven by the implement motor.
4. Battery operated system according to claim 3, wherein the fan arrangement (19) is attached to the implement motor shaft.
5. Battery operated system according to any of the preceding claims, wherein the tool (1) is a power tool.
6. Method for operating a battery operated system comprising a tool (1 ), a battery pack (3) configured to power said tool by being inserted in a tool socket (5) of the tool, and a charger (7), comprising a charger socket (9) for charging said battery pack (3), wherein the battery pack (3) comprises a housing (11) and a cooling channel (13) extending from a first (15) to a second (17) opening in the housing, the method characterised by: cooling the battery pack (3) during use by forcing air from the first (15) to the second (17) opening in the battery pack housing (11), and - cooling the battery pack (3) during charging by forcing air from the second (17) to the first (15) opening in the battery pack housing (11).
SE2150140A 2021-02-09 2021-02-09 Cooling of a Battery Pack in a System Comprising a Tool, a Battery Pack and a Charger SE544853C2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
SE2150140A SE544853C2 (en) 2021-02-09 2021-02-09 Cooling of a Battery Pack in a System Comprising a Tool, a Battery Pack and a Charger
JP2023547771A JP7646849B2 (en) 2021-02-09 2022-02-02 Cooling a battery pack in a system including a tool, a battery pack, and a charger
CN202280010469.6A CN116802962A (en) 2021-02-09 2022-02-02 Cooling of battery packs in systems including tools, battery packs and chargers
PCT/SE2022/050114 WO2022173347A1 (en) 2021-02-09 2022-02-02 Cooling of a battery pack in a system comprising a tool, a battery pack and a charger
AU2022219714A AU2022219714A1 (en) 2021-02-09 2022-02-02 Cooling of a battery pack in a system comprising a tool, a battery pack and a charger
EP22753061.5A EP4292192A4 (en) 2021-02-09 2022-02-02 Cooling of a battery pack in a system comprising a tool, a battery pack and a charger
US18/276,348 US20240113351A1 (en) 2021-02-09 2022-02-02 Cooling of a battery pack in a system comprising a tool, a battery pack and a charger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2150140A SE544853C2 (en) 2021-02-09 2021-02-09 Cooling of a Battery Pack in a System Comprising a Tool, a Battery Pack and a Charger

Publications (2)

Publication Number Publication Date
SE2150140A1 SE2150140A1 (en) 2022-08-10
SE544853C2 true SE544853C2 (en) 2022-12-13

Family

ID=82838100

Family Applications (1)

Application Number Title Priority Date Filing Date
SE2150140A SE544853C2 (en) 2021-02-09 2021-02-09 Cooling of a Battery Pack in a System Comprising a Tool, a Battery Pack and a Charger

Country Status (7)

Country Link
US (1) US20240113351A1 (en)
EP (1) EP4292192A4 (en)
JP (1) JP7646849B2 (en)
CN (1) CN116802962A (en)
AU (1) AU2022219714A1 (en)
SE (1) SE544853C2 (en)
WO (1) WO2022173347A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE547978C2 (en) * 2022-12-13 2026-01-02 Husqvarna Ab Construction equipment with a control unit arranged to switch from using a first battery to using a second battery in response to battery temperature

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0940864A2 (en) * 1998-03-05 1999-09-08 Black & Decker Inc. Battery pack cooling system
US20160294203A1 (en) * 2015-03-30 2016-10-06 Chervon (Hk) Limited Charger, charging system and power tool with battery pack

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3805664B2 (en) * 2001-11-01 2006-08-02 株式会社マキタ Battery pack
EP1780865B1 (en) * 2005-10-31 2017-02-22 Black & Decker, Inc. Thermal management system for a battery pack
JP6948979B2 (en) * 2018-04-17 2021-10-13 ビークルエナジージャパン株式会社 Rechargeable battery pack

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0940864A2 (en) * 1998-03-05 1999-09-08 Black & Decker Inc. Battery pack cooling system
US20160294203A1 (en) * 2015-03-30 2016-10-06 Chervon (Hk) Limited Charger, charging system and power tool with battery pack

Also Published As

Publication number Publication date
WO2022173347A1 (en) 2022-08-18
US20240113351A1 (en) 2024-04-04
AU2022219714A1 (en) 2023-07-06
CN116802962A (en) 2023-09-22
EP4292192A4 (en) 2025-01-29
JP7646849B2 (en) 2025-03-17
EP4292192A1 (en) 2023-12-20
JP2024507116A (en) 2024-02-16
SE2150140A1 (en) 2022-08-10

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