GB2587703A - Power tool system incorporating a power tool and a battery pack platform for use to supply power to operate a power tool TO - Google Patents

Power tool system incorporating a power tool and a battery pack platform for use to supply power to operate a power tool TO Download PDF

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Publication number
GB2587703A
GB2587703A GB2012281.8A GB202012281A GB2587703A GB 2587703 A GB2587703 A GB 2587703A GB 202012281 A GB202012281 A GB 202012281A GB 2587703 A GB2587703 A GB 2587703A
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United Kingdom
Prior art keywords
battery pack
power tool
power
electrical connection
voltage
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Granted
Application number
GB2012281.8A
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GB2587703B (en
GB202012281D0 (en
Inventor
Bakker Rients
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7RDD Ltd
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7RDD Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • 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
    • 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
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • 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

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

Abstract

A power tool 16 and a battery pack 26 which are selectively couplable with one another. Both the battery pack and the power tool having electrical connection means 6, 8 (e.g. terminals) provided in a form which prevents the power tool from attempting to draw voltage from the battery pack if its voltage requirement is greater than the voltage supply capability of the battery pack, thereby avoiding the risk of the battery pack overheating. The battery pack may comprise one or more groups of cells (Figures 3a, 3b), wherein the cells of each group are connected in series and the electrical connection means of the battery pack are arranged so that the connected power tool receives a first or second voltage, depending on the configuration of its electrical connection means. The terminals of the battery pack may differ depending on whether it has one or two groups of cells (Figures 3a, 3b).

Description

Power Tool System incorporating a Power Tool and a. Battery Pack Platform for Use to supply Power to operate a Power Tool The invention to which this application relates is a power tool system which includes a power tool which is provided with a portion, such as for example a drill bit, which, when power is supplied to the power tool, is driven to perform a working operation on a workpiece. The invention is particularly directed towards the type of power tool which receives power from a battery pack which, typically, is mounted to the power tool via mechanical engagement means and electrical connection means so as to allow power to pass from the battery pack to the power tool to operate the same.
Typically, the battery pack is provided to be releasable from the power tool when the battery pack is required to be charged and, in order to do so, the battery pack is then connected to a charger component which in turn, is connected to a mains power supply via which power is provided to charge the power cells in the battery pack.
It is well-known to provide power tools which receive power from a battery pack which are located thereon and, conventionally, the power capacity of the battery pack which is connected to a particular power tool is provided so as to match the power requirements of the particular power tool. For example, certain power tools which perform relatively light work, will only require a smaller level of power to be supplied from the battery pack while power tools which undertake heavier work may require a greater level of power to be supplied thereto in order to allow the work function to be performed. Thus, it is not unusual for a person who has a number of power tools, to have a number of different battery packs, with said battery packs being selectively used with particular power tools.
Furthermore, it is known that different power tool manufacturers will have different configurations of mechanical and/or electrical connections between the respective battery packs and their power tools. Thus, while one type of battery pack may be useable selectively with any power tools made by the same manufacturer and which require the same level of power, it is unusual for a battery pack provided for use with power tools from a particular manufa.cturer to be able to be used with power tools from another manufacturer.
More recently, it has become known for manufacturers to provide a battery pack for use with their power tools and which is useable with power tools winch require different levels of power so that, for example, the same battery pack may selectively provide 'n' Volts to one power tool and '2 n' Volts to another power tool.
The ability to provide different power levels from the same battery pack, thereby reduces the need for the user to have different battery packs for different power supply requirements. This can be achieved, typically, in one of two ways.
Typically, those manufacturers who wish their new battery packs to be useable with previous power tools, commonly referred to as legacy power tools, typically provide a battery pack which has the ability for the electrical connection between groups of power cells in the battery pack to be altered, and the alteration of the connection between the groups of power cells is achieved as a result of mechanical interaction between the power tool and the battery pack, when the battery pack is connected to a particular power tool. For example, a power tool which requires a lower voltage supply from the battery pack, will have a first mechanical configuration which causes the movement of an electrical connection on the battery pack so as to only connect one group of power cells, and a power tool which requires a higher lever of voltage in order for the same to operate, will have a mechanical configuration such that when the same is engaged with the battery pack, the mechanical configuration changes the electrical connection on the battery pack so as to cause the connection of both groups of power cells in the battery pack and thereby allow a higher voltage to be supplied to that power tool. This system has the advantage in that it allows the battery pack to be used with previously manufactured power tools from that manufacturer and therefore avoids rendering the previously manufactured power tools obsolete. However, it does have the disadvantage that the need to allow alteration of the connections on the battery pack via mechanical configuration of the same, makes the manufacture of the battery pack relatively expensive.
An alternative option is to provide the battery pack in a form which is conunon to all power tools of a m2mufacturer such that no alteration of the configuration of the battery pack is required to be performed and, instead, the particular voltage which is supplied to the power tool connected to the battery pack at that time is determined by the configuration of the electrical connection means provided in the power tool itself Thus, the power tool can be connected in the same mechanical configuration to the battery pack, regardless of the particular power level which is required to be drawn from the battery pack to operate that power tool. 't he Applicant, in their patents G11325131178 and GB2552868 define such a system.
However, there is a potential problem in the provision of certain systems as if there is a mismatch between the rated voltage required by the power tool and the voltage which is to be provided by the battery pack then there can be a situation in which electrical connection between the power tool and the battery pack can create heat and potential fire risk when, for example, a power tool which requires a higher voltage is connected to a battery pack which can only supply a lower voltage. In this situation the power tool will attempt to draw power from the battery pack rapidly and so create the heat and risk of fire. 't his therefore means that the battery pack should not be made available for use with the power tool or the manufacturer should not suggest that the battery pack and power tool combination can be achieved.
It is an aim of the present invention to be able to prevent the risk of the rated voltage mismatch between the power tool and the battery pack connected thereto from causing the risk of fire and/or generation of heat from occulting while still allowing the possibility of the battery pack and power tool system to be provided which can provide different voltage requirements to be achievable.
In a first aspect of the invention, there is provided a power tool and at least one battery pack which are selectively connectable, said battery pack including power cells located therein and said power tool mechanically engageable with the battery pack to allow the battery pack to be secured with and carried by the power tool during use and the provision of power from the battery pack to the power tool and wherein the power tool is provided with electrical connection means and the battery pack is provided with electrical connection means such that when the same are electrically connected, power is provided from the battery pack to the power tool and wherein the electrical connection means on the power tool are provided in a form such that it is not possible for a power tool with a voltage requirement greater than the voltage supply capability of the battery pa.ck to be electrically connected to the battery pack in a manner which would cause the power tool to attempt to draw a voltage from the battery pack at the required voltage level of the power tool.
In one embodiment, the battery pack can be provided to include at least one group of power cells and in another embodiment, the battery pack can be provided to include at least two groups of power cells.
Typically, when the battery pack is provided to include only one group of power cells, then the electrical connection means of the battery pack are provided in a form so as to allow the cells in that group to be only connected in series and provide voltage at a lower level.
Typically, when the battery pack includes two groups of power cells then each of the cells in a group are connected in series and the electrical connection means of the battery pack are provided in a format so as to allow the power tool connected therewith to receive power at a first voltage n NP and a second voltage '2n V' dependent upon the configuration of the electrical connection means of the power tool.
Typically, the number of electrical connection terminals of the power tool remain the same regardless of the particular voltage which is required to operate that power tool.
Typically, the electrical connection terminals of the battery pack, differ between a battery pack which is provided with one group of power cells and a battery pack which is provided with two groups of power cells and, in one embodiment, the battery pa.ck with two groups of power cells, includes two additional terminals.
In one embodiment, the connection between the terminals of the electrical connection means of the power tool, determine which of the voltages of 'n' or '2 nAT' is received from the battery pack which includes the two groups of power cells, when the battery pack is connected to the power tool.
Typically, the configuration of the electrical connection means of the terminals in the power tool, is predefined and predetermined at the time of manufacture and requires no user intervention at the time of connection between the battery pack and the power tool in order to provide the appropriate voltage for the power tool operation.
S
In a further aspect of the invention there is provided a battery pack and power tool system which allows power tools and systems to be provided with the same number of electrical terminals, regardless of the particular voltage level which is required to operate the power tool, whilst the provision of selective termthal configurations on the battery pack with regard to the capability of that battery pack to provide different voltage levels, ensures that the possibility of electrical connection of a power tool which, to operate correctly, requires a. voltage to be supplied from the battery pack which is at a. higher level than the battery pack is capable of providing to the power tool, is prevented.
Thus, m accordance with the invention, there is provided a battery pack and power tool system which allows power tools in the system to be provided with the same number of electrical terminals, regardless of the particular voltage level which is required to operate the power tool whilst the provision of selective terminal configurations on the battery pack with regard to the capability of that battery pack to provide different voltage levels, ensures that the possibility of a power tool which requires a higher voltage level to be supplied from the battery pack being connected to a battery pack which is incapable or providing the higher voltage, is prevented due to the particular configuration of the electrical termthals of the battery pack preventing the connection.
Specific embodiments of the invention are now described with reference to the accompanying drawings wherein: Figures 1a and b illustrate the terminals which are provided on the battery pack which includes two groups of power cells and one group of power cells respectively; Figures 2a and b illustrate the electrical terminals which are provided on the power tool ni accordance with one embodiment of the invention; Figures 3a-e illustrate acceptable connection configurations between power tools and battery packs in accordance with the invention; and Figures 4a and b illustrate the electrical connection configuration which is prevented from occurnn. g in accordance with the Mvention.
As already stated, the invention is directed towards allowing one of two voltage levels to be provided to power tools from the same battery pack so that a power tool which requires a. particular one of the two voltages can be supplied with that voltage and another power tool which requires the other of the said two voltages can be provided with that said voltage when connected to the battery pack if the battery pack has the capability to do so. At this same time, the invention is directed towards ensuring that there is no possibility of a power tool which requires a higher voltage level attempting to draw power from a battery pack which is not capable of safely providing the higher voltage level.
Thus, there is provided a battery pack and power tool platform in accordance with the invention in which the terminal interfaces of the power tools can connect with the power cells, such as lithium cells, provided in the battery pack, in series or in parallel, depending on the required voltage level of the power tool. However, the problem created if there is a battery pack platform which includes a single group of power cells which cannot be selectively connected in both series and parallel by terminal interfaces of power tools is a particular problem in terms of safety of operation of the battery pack so that, for example, when power tools included in the platform only function when the product terminal interface connects with two power cell groups of the battery pack in series, a single power cell group battery pack cannot be allowed to connect with those power tools which need two power cell groups to be present in the battery pack so that they can be connected in series.
In accordance with the invention, when a battery pack with only a single group of power cells is provided it has two less terminals at the battery pack interface than the interface for a battery pa.ck which has two groups of power cells and because these two electrical terminals are not provided on the interface of the battery pack with the single group of power cells the battery pack calmot be electrically connected with those power tools which need the two groups of power cells connected in series to provide a sufficient voltage level and hence the risk situation is avoided.
Figure Ia illustrates the terminal arrangement for a terminal interface 4 for a battery pack interface which has two groups of power cells therein and in Figure lb the battery pack terminals for an interface for a battery pack which has one group or string of the power cells in accordance with the invention is shown.
In Figures la and 3a, then Al is a negative terminal of the string or group 1 of power cells M. series, A2 is a negative terminal of the string or group 2 of power cells in series, '11 is a temperature terminal, ID is the identification terminal for the power tool connected to the battery pack at that time, B1 is a positive termthal of string or group 1 of the power cells and B2 is the positive terminal for the string or group 2 of power cells.
In Figures lb and 3b it will be seen that the battery pack with only one string or group 1 of power cells has only the terminals Al, 1, ID and 131 at the interface 6.
In Figure 2a, the terminal configuration of the interface 8 for a power tool which requires power to be provided from the two groups 1,2 of power cells in the battery pack in series is shown and in Figure 2b the terminal configuration of the interface 10 for a power tool which requires power to be provided from the two groups 1,2 of power cells in the battery pack in parallel is shown. It will be seen that both power tool interfaces 8,10 have the same terminals and it is the connection of the same within the power tools within the power tool which is altered as will be explained subsequently.
It is therefore possible in accordance with the invention for a battery pack with two strings (Jr groups 1,2 of power cells to be connected to power tools which require a voltage supply at one of two voltage levels but it is only possible for the battery pack with one group or string power cells to be connected to the power tool which requires power at the lower voltage level.
This is illustrated with regard to Figures 3c-e and Figures 4a-b. Figures 3c-d illustrate a battery pack 12 which has two strings or groups 1,2 of power cells. In Figure 3c it is shown that the motor 14 for the power tool 16 is rated for using the two groups or strings 1,2 of power cells of the battery pack in series and the termMals Al and B2 of the interface 8 are connected by the connection path 18 within the power tool to achieve this.
In Figures 3d and e the motor 20 for the power tool 16 is rated for using the two groups or strings -1,2 of power cells of the battery pack 12 in parallel as shown in Figure 3d or a single string or group 1 of power cells of a battery pack 26 with a
S
terminal interface 6 as shown in Figure 3e and the terminals Al and A2 and B1 and B2 of the interface 10 are respectively electrically connected by connection paths 22,24 within the power tool to achieve this as connection can still be achieved between the terminals Al of interfaces 6,10 and B1 of interfaces 6,10, with Al and B1 of interface 6 connecting with the only group or string 1 of power cells in the battery pack 26.
In accordance with the invention, in the circumstances where the power tool 16 with the motor 14 with the requirement for two groups or strings of power cells of a battery pack to be provided in series to supply a higher voltage, is attempted to be used with the battery pack 26 with only one group or string of power cells 1 then electrical connection of the terminal interface of the power tool 8 with the battery pack terminal interfa.ce 6 cannot be achieved as the terminal 132 of the power tool interface 8 ha.s no matching terminal on the battery pack terminal interface 6 and so no electrical connection between the battery pack and power tool arrangement shown in I;igure 4b can be achieved.
This invention therefore ensures that only safe electrical connections can be achieved between power tools and battery packs which may be provided as part of a same general platform when a battery pack and power tool using the same mechanical connection platform are selected incorrectly by user to be mechanically connected together.

Claims (11)

  1. Claims 1. A power tool and at least one battery pack which are selectively connectable, said battery pack including power cells located therein and said power tool mechanically engageable with the battery pack to allow the battery pack to be secured with an carried by the power tool during use and the provision of power from the battery pack to the power tool and wherein the power tool is provided with electrical connection means and the battery pack is provided with electrical connection means such that when the same are electrically connected, power is provided from the battery pack to the power tool and wherein the electrical connection means and the power tool arc provided in a form such that it is not possible for a power tool with a voltage reqmr. ement greater than the voltage supply capability of the battery pack to be electrically connected to the battery pack in a manner which would cause the power tool to attempt to draw a voltage from the battery pack at the required voltage level of the power tool.
  2. 2. Apparatus according to claim 1 wherein the battery pack is provided to include at least one group of power cells.
  3. 3. Apparatus according to clam'. 2 wherein the electrical connection means of the battery pack are provided in a form so as to allow the cells in that group to only be connected in series and provide voltage at a lower level.
  4. 4. Apparatus according to claim I wherein the battery pack is provided to include at least two groups of power cells.
  5. 5. Apparatus according to claim 4 wherein each of the power cells in a group are connected in series and the electrical connection means of the battery pack are provided in a format so as to allow the power tool connected therewith to receive power at a first voltage (nr or a second voltage (211\) dependent upon the configuration of the electrical connection means of the power tool which is connected with the battery pack.
  6. 6. Apparatus according to any of the preceding claims wherein a number of electrical connection terminals of the power tool are the same regardless of the particular voltage level which is required to operate that power tool.
  7. 7. Apparatus according to any of the preceding claims wherein the electrical connection terminals of the battery pack with one group of power cells differ to those of the battery pack with two groups of power cells.
  8. 8. Apparatus according to claim 7 wherein the battery pack with two groups of power cells includes two additional terminals.
  9. 9. Apparatus according to any of the preceding claims wherein the connection between the terminals of the electrical connection means of the power tool determine which of the voltages of n)\/ or (2n) V is received from the battery pack which includes two groups of power cells when the battery pack is connected to the power tool.
  10. 10. Apparatus according to any of the preceding chinas wherein the configuration of the electrical connection means of the terminals in the power tool is predefined and predetermined at the time of manufacture of the power tool and requires no subsequent user intervention at the time of connection between the battery pack and the power tool in order to provide appropriate voltage level for the power tool operation.
  11. 11. A battery pack and power tool system which allows power tools and systems to be provided with the same number of electrical terminals, regardless of the particular voltage level which is required to operate the power tool, whilst the provision of selective terminal configurations on the battery pack with regard to the capability of that battery pack to provide different voltage levels, ensures that the possibility of electrical connection of a power tool which, to operate correctly, requires a voltage to be supplied from the battery pa.ck which is at a higher level than the battery pack is capable of providing to the power tool, is prevented.
GB2012281.8A 2019-08-09 2020-08-06 Power tool system incorporating a power tool and a battery pack platform for use to supply power to operate a power tool Active GB2587703B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB1911425.5A GB201911425D0 (en) 2019-08-09 2019-08-09 Power tool system incorporating a power tool and a battery pack platform for use to supply power to operate a power tool

Publications (3)

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GB202012281D0 GB202012281D0 (en) 2020-09-23
GB2587703A true GB2587703A (en) 2021-04-07
GB2587703B GB2587703B (en) 2023-04-05

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GBGB1911425.5A Ceased GB201911425D0 (en) 2019-08-09 2019-08-09 Power tool system incorporating a power tool and a battery pack platform for use to supply power to operate a power tool
GB2012281.8A Active GB2587703B (en) 2019-08-09 2020-08-06 Power tool system incorporating a power tool and a battery pack platform for use to supply power to operate a power tool

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GBGB1911425.5A Ceased GB201911425D0 (en) 2019-08-09 2019-08-09 Power tool system incorporating a power tool and a battery pack platform for use to supply power to operate a power tool

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CN (1) CN212033120U (en)
DE (1) DE202019105709U1 (en)
GB (2) GB201911425D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2607720A (en) * 2021-05-05 2022-12-14 7Rdd Ltd Power tools and battery packs system

Citations (2)

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Publication number Priority date Publication date Assignee Title
WO2014148452A1 (en) * 2013-03-21 2014-09-25 日立工機株式会社 Battery pack and electrical device
WO2019031272A1 (en) * 2017-08-09 2019-02-14 工機ホールディングス株式会社 Electric device system, electric device, and power supply device

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Publication number Priority date Publication date Assignee Title
JP4234875B2 (en) * 2000-02-18 2009-03-04 日立工機株式会社 DC power supply
JP2007144813A (en) * 2005-11-28 2007-06-14 Nidec Shibaura Corp Mold for producing power tool
JP5491925B2 (en) * 2010-03-26 2014-05-14 パナソニック株式会社 Electric tool
JP5616104B2 (en) * 2010-04-12 2014-10-29 株式会社マキタ Power tools powered by battery packs and their adapters

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014148452A1 (en) * 2013-03-21 2014-09-25 日立工機株式会社 Battery pack and electrical device
WO2019031272A1 (en) * 2017-08-09 2019-02-14 工機ホールディングス株式会社 Electric device system, electric device, and power supply device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2607720A (en) * 2021-05-05 2022-12-14 7Rdd Ltd Power tools and battery packs system

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CN212033120U (en) 2020-11-27
GB201911425D0 (en) 2019-09-25
GB2587703B (en) 2023-04-05
DE202019105709U1 (en) 2020-01-07
GB202012281D0 (en) 2020-09-23

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