CN213026298U - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
CN213026298U
CN213026298U CN202021799732.9U CN202021799732U CN213026298U CN 213026298 U CN213026298 U CN 213026298U CN 202021799732 U CN202021799732 U CN 202021799732U CN 213026298 U CN213026298 U CN 213026298U
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China
Prior art keywords
battery
case
battery pack
substrate
outer case
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CN202021799732.9U
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Chinese (zh)
Inventor
长滨达也
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Makita Corp
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Makita Corp
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    • 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
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/65—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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)
  • Secondary Cells (AREA)

Abstract

The utility model provides a can restrain the technique of the water in the shell of invasion group battery to the base plate contact. The battery pack includes: the shell body, accept in the battery unit casing of shell body, accept in the shell body and receive the base plate of keeping the shell body, the shell body possesses: an upper surface provided with a terminal opening portion for exposing the terminal; a bottom surface; a side surface extending upward from the bottom surface; a hook member disposed on the side surface; and a1 st opening disposed on the side surface, wherein the substrate is disposed at a position facing the side surface, the substrate is disposed below the hook member, and the 1 st opening is disposed below the substrate.

Description

Battery pack
Technical Field
The technology disclosed by the present specification relates to a battery pack.
Background
Patent document 1 discloses a battery pack. The battery pack of patent document 1 includes: the battery pack comprises an outer shell, a battery unit shell accommodated in the outer shell, and a substrate accommodated in the outer shell.
Patent document 1: japanese patent laid-open No. 2014-203703
There is a possibility that water enters into the outer case from a gap or the like of the outer case. If water remains in the battery pack and the water contacts the substrate, there is a possibility that the battery pack may not operate normally. Therefore, even if water is immersed into the housing, the water is prevented from contacting the substrate.
SUMMERY OF THE UTILITY MODEL
The present specification provides a technique capable of suppressing contact of water that has intruded into an outer case of a battery pack with a substrate.
The battery pack disclosed by the present specification includes: an outer housing; a hook member; and a substrate accommodated in the outer case and held by the outer case, the outer case including: an upper surface provided with a terminal opening portion for exposing the terminal; a bottom surface; a side surface extending upward from the bottom surface; and a1 st opening disposed on the side surface, the hook member being disposed on the side surface of the outer case, the substrate being disposed at a position facing the side surface, the substrate being disposed below the hook member, and the 1 st opening being disposed below the substrate.
In the battery pack described above, water that has intruded into the case is drained from the 1 st opening provided below the substrate. Therefore, even if water is immersed in the outer case, water does not remain in the vicinity of the substrate. Therefore, the water intruding into the outer case can be suppressed from contacting the substrate.
Another battery pack disclosed in the present specification includes: an outer housing; a battery cell; a battery cell case that is housed in the outer case and houses the battery cell; and a substrate accommodated in the outer case, the outer case including: an upper surface provided with a terminal opening portion for exposing the terminal; a bottom surface; and a side surface extending upward from the bottom surface, wherein the substrate is provided between the battery cell case and the side surface and is disposed in a direction orthogonal to the bottom surface, and an opening is provided in the outer case on a surface facing a lower surface of the substrate.
In the battery pack described above, water that has intruded into the case is drained from the opening facing the lower surface of the substrate. Therefore, even if water is immersed in the outer case, water does not remain in the vicinity of the substrate. Therefore, the water intruding into the outer case can be suppressed from contacting the substrate.
Another battery pack disclosed in the present specification includes: an outer housing; and a substrate held by the outer case, the outer case including: an upper surface provided with a terminal opening portion for exposing the terminal; a bottom surface; and a side surface extending upward from the bottom surface, wherein the substrate is provided at a position facing the side surface, and the side surface is provided with an opening.
In the battery pack described above, water that has intruded into the outer case is drained from the opening. Therefore, even if water is immersed in the outer case, water does not remain in the vicinity of the substrate. Therefore, the water intruding into the outer case can be suppressed from contacting the substrate.
Drawings
Fig. 1A is a perspective view of the battery pack 2 of embodiment 1 as viewed from the front right above.
Fig. 1B is a perspective view of the battery pack 2 of embodiment 1 as viewed from the front right below.
Fig. 1C is a perspective view of the battery pack 2 of embodiment 1 viewed from the upper right rear.
Fig. 2 is a bottom view of the battery pack 2 of embodiment 1 as viewed from below.
Fig. 3 is a right side view of the battery pack 2 of embodiment 1 as viewed from the right.
Fig. 4A is a bottom view of the upper case 14 of embodiment 1 as viewed from below.
Fig. 4B is a perspective view of the upper case 14 of embodiment 1 as viewed from the front left and lower.
Fig. 4C is a sectional view of the slide rail 20 of the upper housing 14 of embodiment 1 as viewed from the rear.
Fig. 5 is an enlarged view of a broken line V portion of fig. 4A.
Fig. 6 is a plan view of the lower case 15 of embodiment 1 as viewed from above.
Fig. 7 is an enlarged perspective view of a broken line VII portion of fig. 6 as viewed from right above and behind.
Fig. 8 is a perspective view of the lower case 15 of embodiment 1 as viewed from the upper left rear.
Fig. 9A is a perspective view of the battery module 10 of embodiment 1 as viewed from the front right above.
Fig. 9B is a perspective view of the battery module 10 of embodiment 1 viewed from the left rear upper side.
Fig. 10 is a sectional view taken along line X-X of fig. 9A.
Fig. 11A is a perspective view of the battery cell case 80 of embodiment 1 as viewed from the front right above.
Fig. 11B is a perspective view of right battery cell case 85 of embodiment 1 viewed from the upper left rear.
Fig. 11C is a plan view of the battery cell case 80 of embodiment 1 as viewed from above.
Fig. 12A is a plan view of a state in which the battery module 10 and the lower case 15 are fixed in embodiment 1.
Fig. 12B is a plan view of the battery pack 2 of embodiment 1 as viewed from the upper surface.
Fig. 13A is an enlarged view of a broken line XIII portion of fig. 12A.
Fig. 13B is a cross-sectional view taken along line XIIIB-XIIIB of fig. 13A.
Fig. 14 is a top sectional view of the battery pack 2 according to the present embodiment.
Fig. 15 is an enlarged view of a broken line XV portion of fig. 14.
Fig. 16 is a top sectional view of the battery pack 2 according to the present embodiment.
Fig. 17 is an enlarged view of a broken line XVII portion of fig. 16.
Fig. 18 is a sectional view of the battery pack 2 according to embodiment 1 as viewed from the right.
Fig. 19 is a sectional view of the battery pack 2 according to embodiment 1 as viewed from the right.
Fig. 20 is a sectional view of the battery pack 2 according to embodiment 1 as viewed from the rear.
Fig. 21 is a sectional view taken along line XXI-XXI in fig. 12A and 12B.
Fig. 22 is a cross-sectional view of the battery pack 2 according to embodiment 1 mounted on the charger 300 as viewed from the left.
Fig. 23 is a cross-sectional view of the battery pack 2 according to embodiment 1 attached to the charger 300 as viewed from the left.
Fig. 24A is a perspective view of the electric power tool 200 with the battery pack 2 according to embodiment 1 attached, as viewed from the front right above.
Fig. 24B is a sectional view of the electric power tool 200 with the battery pack 2 according to embodiment 1 attached from the rear.
Fig. 25A is a perspective view of the assembled battery 2 according to embodiment 1 mounted on the charger 300, as viewed from the left rear lower side.
Fig. 25B is a perspective view of the charger 300 viewed from the left rear lower side.
Fig. 26 is a perspective view of the battery pack 602 of embodiment 2 as viewed from the front right below.
Description of the reference numerals
A battery pack; a battery module; 12.. an outer housing; an upper housing; a front surface; a front side upper surface; 14b2.. a rear side upper surface; a lower housing; a front surface; a right side; a rear surface; a left side; a bottom surface; a corner portion; a flat portion; a projection; a recess; a step portion; a1 st upper extension plane; an inclined surface; 17c.. 2 nd upper extension plane; a screw; a hook portion; a sliding guide rail; a base; an upper extension; 1 st right extension portion; a 2 nd right extension; a recess; a terminal receiving portion; 22a to 22d. 23a to 23d.. the battery side recess; a hook component; an operating portion; a projection; a vent hole; a battery-side recess; a threaded hole; 30 a-30 e.. 1 st raised strip portion; a thick-walled portion; a thin wall portion; 34 a-34 f.. 2 nd ridge; a vent hole; 40 a-40 j. A vent hole; 41 a-41 j.. hole; a display portion; a remaining amount display unit; a button; lower end; lower end; a threaded hole; a front rib; a front rib; a trough portion; a front rib; a front rib; 56... front rib; a light-shielding wall portion; a flat portion; 58 a-58 d.. vent; 60 a-60 h.. side ribs; a threaded hole; 64 a-64 f.. 2 nd recess; 80.. a battery cell housing; a front portion; a rear portion; a thick-walled portion; an upper surface; a right side surface; the left side surface; a recess; an air vent; an air vent; 82.. a control substrate; a threaded boss; an LED substrate; an LED; a switch; a lower surface; 85.. a right battery cell housing; 86.. a left battery cell housing; 87a to 87j.. the battery cell holding section; 88... connecting; a central side holding portion; an end face side holding portion; 90 a-90 j.. battery cells; a metal portion; a lower end; 92 a-92 k. 93 a-93 c.. side; side surface; side surface; 94.. waterproof ring; an upper end; a lower end; a fastener; a terminal; a battery-side negative terminal; a battery-side positive terminal; 106a to 106d.. the battery side signal terminals; 110 a-110 e.. 1 st recess; a fixing portion; a screw; 116 a-116 e.. the projection; a signal line; a power tool; 202.. a terminal holding portion; 206 a-206 d.. the tool-side protrusions; a tool side negative terminal; a tool side positive terminal; 210a, 210c.. tool side signal terminals; a charger; sliding guide rails; a housing; a charger-side projection portion; a vent hole; a battery pack; 612.. an outer housing; 615.. a lower housing; 615e.. bottom surface; 619a, 619b.
Detailed Description
The battery pack disclosed by the present specification includes: an outer housing; a hook member; and a substrate accommodated in the outer case and held by the outer case, the outer case including: an upper surface provided with a terminal opening portion for exposing the terminal; a bottom surface; a side surface extending upward from the bottom surface; and a1 st opening disposed on the side surface, the hook member being disposed on the side surface of the outer case, the substrate being disposed at a position facing the side surface, the substrate being disposed below the hook member, and the 1 st opening being disposed below the substrate.
In one or more embodiments, the side surface may include an inclined portion inclined with respect to the bottom surface, and the 1 st opening may be provided in the inclined portion.
According to the above configuration, water entering the outer case from the hook member and the like can be drained from the 1 st opening of the inclined portion. Therefore, the contact of the substrate with the water entering the outer case can be further suppressed. In addition, the water that is not discharged from the 1 st opening can be guided to the bottom surface by the inclined portion.
In one or more embodiments, the battery pack may further include: a battery cell; and a battery unit case that is housed in the outer case and houses the battery unit. The battery unit may be disposed in parallel with the bottom surface of the outer case. The 1 st opening may be located above the lower end of the battery cell.
Water intruding into the outer case is easily retained on the bottom surface of the outer case. Therefore, it is preferable to dispose the substrate as upward as possible. According to the above configuration, the 1 st opening is provided above the lower end of the battery cell, and the substrate is provided above the 1 st opening. Therefore, the substrate can be arranged further upward than the case where the 1 st opening is provided lower than the lower end of the battery cell. Therefore, the contact of the substrate with the water entering the outer case can be further suppressed.
In one or more embodiments, a 2 nd opening may be provided in the upper surface of the outer case, and air may be communicated between the 1 st opening and the 2 nd opening.
According to the above configuration, for example, even in a state where the battery pack is attached to the charger, the 1 st opening can function as an intake hole or an exhaust hole.
In one or more embodiments, the side surface may be provided with a plurality of protruding portions that protrude toward the substrate side. The space between the substrate and the outer case may be divided into two or more spaces by the plurality of protruding portions, and the outer case may be provided with the 1 st openings corresponding to the two or more spaces, respectively.
In the case where there is a space in which the corresponding 1 st opening is not provided, among the two or more spaces, water is caused to remain in the space. In this case, the water remaining in the space may contact the substrate. According to the above configuration, water can be discharged from two or more spaces divided by the plurality of protruding portions, respectively. Therefore, the contact of water with the substrate can be suppressed.
Another battery pack disclosed in the present specification includes: an outer housing; a battery cell; a battery cell case that is housed in the outer case and houses the battery cell; and a substrate accommodated in the outer case, the outer case including: an upper surface provided with a terminal opening portion for exposing the terminal; a bottom surface; and a side surface extending upward from the bottom surface, wherein the substrate is provided between the battery cell case and the side surface and is disposed in a direction orthogonal to the bottom surface, and the outer case is provided with an opening on a surface facing a lower surface of the substrate.
In one or more embodiments, a surface of the outer case facing the lower surface of the substrate may be an inclined surface inclined with respect to the bottom surface.
According to the above configuration, the water that has entered the outer case and reached the inclined surface is guided along the inclined surface toward the bottom surface. This can prevent water from remaining in the vicinity of the substrate.
Another battery pack disclosed in the present specification includes: an outer housing; and a substrate held by the outer case, the outer case including: an upper surface provided with a terminal opening portion for exposing the terminal; a bottom surface; and a side surface extending upward from the bottom surface, wherein the substrate is provided at a position facing the side surface, and the side surface is provided with an opening.
In one or more embodiments, the substrate may be a substrate provided with an LED, a substrate provided with a switch, or a substrate provided with an LED and a switch.
In general, it is difficult to perform waterproof processing on a substrate provided with an LED or a switch. Therefore, it is necessary to suppress the contact of water with the substrate. According to the above configuration, even when a substrate that is difficult to be subjected to waterproofing is mounted, water can be prevented from contacting the substrate.
In one or more embodiments, the side surface may be provided with a plurality of protruding portions that protrude toward the substrate side. The space between the substrate and the outer case may be divided into two or more spaces by the plurality of protruding portions, and the outer case may be provided with openings corresponding to the two or more spaces.
In the case where there is a space in which no corresponding opening is provided, among the two or more spaces, water is caused to remain in the space. In this case, the water remaining in the space may contact the substrate. According to the above configuration, water is drained from two or more spaces divided by the plurality of protruding portions, respectively. Therefore, the contact of water with the substrate can be suppressed.
In one or more embodiments, the side surface may include an inclined portion inclined with respect to the bottom surface, and the opening may be provided in the inclined portion of the side surface.
According to the above configuration, water flowing along the side surface can be drained from the opening of the inclined portion. Therefore, the contact of the substrate with the water entering the outer case can be further suppressed. In addition, the water that is not discharged from the opening can be guided to the bottom surface by the inclined portion.
(embodiment 1)
The battery pack 2 of the embodiment will be described below with reference to the drawings. As shown in fig. 24A, the battery pack 2 is detachably attached to the electric power tool 200. In fig. 24A, the case where the electric power tool 200 is an electric driver is exemplified, but the electric power tool 200 may be, for example, an electric drill, an electric grinder, an electric circular saw, an electric chain saw, an electric reciprocating saw, an electric lawnmower, an electric lawn mower, an electric blower, or the like. When attached to the electric power tool 200, the battery pack 2 supplies electric power to the electric power tool 200. As shown in fig. 25, the battery pack 2 is detachably attached to the charger 300. When attached to charger 300, battery pack 2 is supplied with electric power from charger 300. In the following description, the direction in which the electric power tool 200 and the charger 300 are present when the battery pack 2 is attached to the electric power tool 200 and the charger 300 is referred to as an upper direction, and the opposite direction is referred to as a lower direction. In addition, the direction in which the battery pack 2 slides when attached to the electric power tool 200 or the charger 300 is referred to as the rear direction, and the direction in which the battery pack 2 slides when detached from the electric power tool 200 or the charger 300 is referred to as the front direction. That is, in the following description, the front-rear direction corresponds to a sliding direction in which the battery pack 2 slides with respect to the electric power tool 200 or the charger 300.
As shown in fig. 1 to 13B, the battery pack 2 includes: a battery module 10 (see fig. 9), and an outer case 12 (see fig. 1) that houses the battery module 10. The outer case 12 is formed in a substantially rectangular parallelepiped shape as a whole, and is divided into an upper case 14 and a lower case 15. As shown in fig. 2, the upper case 14 and the lower case 15 are fixed to each other by four screws 18.
(Structure of Upper case 14)
As shown in fig. 1A, the upper housing 14 is formed with a slide rail 20, a terminal receiving portion 22, a hook member 24, and a vent hole 26.
The slide rails 20 extend in the front-rear direction and are disposed at the left and right ends of the upper portion of the upper housing 14. As shown in fig. 1A, the slide rail 20 includes a base portion 20a, an upper extending portion 20b, a1 st right extending portion 20c, and a 2 nd right extending portion 20d. As shown in fig. 4C, the upward extending portion 20b extends upward from the left end of the base portion 20a. The 1 st right extending portion 20c extends rightward from the upper extending portion 20b. The lower end of the 1 st right extending portion 20c is located above the upper end of the base portion 20a. The right end of the 1 st right extending portion 20c is located leftward from the right end of the base portion 20a. The 2 nd right extending portion 20d extends rightward from the upper extending portion 20b. The right end of the 2 nd right extending portion 20d coincides with the right end of the 1 st right extending portion 20c in position in the left-right direction. As shown in fig. 1A, the 2 nd right extending portion 20d is connected with the base portion 20a. A plurality of recessed portions 20e aligned in the front-rear direction are provided at the 1 st right extending portion 20c and the 2 nd right extending portion 20d. When the battery pack 2 is attached to and detached from the electric power tool 200 and the charger 300, the slide rail 20 is slidably engaged with a slide rail (not shown) of the electric power tool 200 and a slide rail 302 (see fig. 25B) of the charger 300. Specifically, a slide rail (not shown) of the electric power tool 200 and a slide rail 302 of the charger 300 slide between the base 20a and the 1 st right extending portion 20c.
The terminal receiving portion 22 includes four terminal openings 22a to 22d provided in the front upper surface 14b1 of the upper case 14. The terminal openings 22a to 22d are disposed between the left and right slide rails 20, and receive the terminals 208a, 208B, 210a, and 210c (see fig. 24B) of the electric power tool 200 and the terminals (not shown) of the charger 300 when the battery pack 2 is mounted on the electric power tool 200 and the charger 300. The terminal openings 22a to 22d are formed from the right slide rail 20 toward the left slide rail 20, and the terminal opening 22a, the terminal opening 22b, the terminal opening 22c, and the terminal opening 22d are provided in this order. As shown in fig. 1C, 12B, and 24B, battery-side recessed portions 23a to 23d are provided so as to surround the terminal openings 22a to 22d. The terminal openings 22a to 22d and the battery-side recesses 23a to 23d have U-shapes in plan view of the battery pack 2. The battery-side depressed portions 23a to 23d are provided slightly below the front upper surface 14b1 of the outer case 12. That is, the front upper surface 14b1 and the battery-side concave portions 23a to 23d have a stepped shape.
The hook member 24 is disposed at the front upper portion of the upper case 14. The hook member 24 is a resin member, and includes an operation portion 24a and a projection portion 24b. The operating portion 24a is provided on the front surface 14a of the upper housing 14. The hook member 24 is held by the upper case 14 so as to be movable in the vertical direction. The hook member 24 is biased upward by a compression spring, not shown, and when the operation portion 24a and the projection portion 24b are pressed downward, the hook member 24 moves downward. When the battery pack 2 is attached to the electric power tool 200 or the charger 300, the protruding portion 24B engages with a housing (not shown) of the electric power tool 200 or a housing 304 (see fig. 25B) of the charger 300, and the battery pack 2 is fixed to the electric power tool 200 or the charger 300. When the battery pack 2 is removed from the power tool 200 or the charger 300, the user pushes the operating portion 24a downward, and the protruding portion 24b moves downward. In this state, by sliding the battery pack 2, the battery pack 2 can be removed from the electric power tool 200 and the charger 300. The operating portion 24a has a shape recessed inward. Therefore, when the user presses down the operation portion 24a with a finger placed on the operation portion 24a, the user can press down the operation portion 24a without slipping the finger.
The vent hole 26 is provided rearward of the slide rail 20. The vent hole 26 is provided at the rear of the rear upper surface 14b2 of the outer case 12. The rear upper surface 14b2 is located below the front upper surface 14b1 and above the base 20a of the slide rail 20. Battery-side recessed portions 27 are provided on right, left, and front portions of the vent hole 26. The battery-side depressed portion 27 is provided slightly below the rear upper surface 14b2. That is, the rear upper surface 14b2 and the battery-side depressed portion 27 have a stepped shape. The charger 300 is provided with a charger-side protrusion 306 having a shape corresponding to the battery-side recess 27 (see fig. 25B). Therefore, when the battery pack 2 is mounted on the charger 300, the charger-side protrusions 306 are inserted into the battery-side recesses 27.
As shown in fig. 4A, the upper case 14 is provided with four screw holes 28 and five 1 st protrusions 30a to 30e. The screws 18 are screwed into the four screw holes 28 (see fig. 2). As shown in fig. 4B, the 1 st protrusions 30a to 30e protrude downward (i.e., toward the battery cell case 80) from the upper surface of the upper case 14. As shown in fig. 4C, the 1 st protruding portion 30d is provided below the slide rail 20 (specifically, the base portion 20a), that is, inside the upper housing 14. The 1 st protrusions 30a to 30c, 30e are also provided below the slide rail 20. As shown in fig. 5, the 1 st projection 30 is composed of a thick portion 32a and a thin portion 32b. The thickness of the thick portion 32a in the left-right direction is larger than the thickness of the thin portion 32b in the left-right direction. In the 1 st protrusion 30, thick portions 32a and thin portions 32b are alternately formed. As shown in fig. 4A, the 1 st protrusions 30a to 30d are composed of four thick portions 32a and three thin portions 32b. The 1 st protruding portion 30e is composed of three thick portions 32a and two thin portions 32b. As shown in fig. 5, the longitudinal length L1 of the 1 st protrusions 30a to 30d is greater than the longitudinal length L2 of the 1 st protrusions 30e.
As shown in fig. 4A, the upper case 14 is provided with six 2 nd protrusions 34A to 34f for aligning the upper case 14 and the lower case 15.
(Structure of lower case 15)
As shown in fig. 1B and 8, the lower case 15 includes a front surface 15a, a right side surface 15B, a rear surface 15c, a left side surface 15d, and a bottom surface 15e. The front surface 15a is constituted by a1 st upwardly extending surface 17a extending perpendicularly to the bottom surface 15e, an inclined surface 17b inclined with respect to the bottom surface 15e, and a 2 nd upwardly extending surface 17c extending perpendicularly to the bottom surface 15e. As shown in fig. 13B, the inclined surface 17B is inclined such that the rear portion is inclined downward. As shown in fig. 1A, the lower case 15 is provided with a vent hole 40 and a display portion 42. The display portion 42 is provided on the front surface 15a of the lower case 15. The display unit 42 includes: a remaining charge amount display unit 42a for presenting the remaining charge amount of the battery pack 2 to the user, and a button 42b for switching on/off of the display of the remaining charge amount. As shown in fig. 1B, the inclined surface 17B of the lower case 15 is provided with vent holes 58a to 58d. Further, a hook portion 19 is provided on the bottom surface 15e of the lower case 15. The hook 19 is used when the battery pack 2 is removed from the power tool 200 or the charger 300. Specifically, the user pushes the operation portion 24a downward with the thumb in a state where the index finger or the middle finger is hooked on the hooking portion 19 (see fig. 1A).
As shown in fig. 3, the vent hole 40 is provided in the lower portion of the right side surface 15b of the lower case 15. The vent hole 40 is constituted by ten holes 40a to 40j. The ten holes 40a to 40j are arranged in upper and lower layers. Of the five holes 40a to 40e provided in the lower layer, the hole 40a provided on the rearmost side and the hole 40e provided on the foremost side have a length in the front-rear direction smaller than the length of the holes 40b to 44d in the front-rear direction. Further, of the five holes 40f to 44j provided in the upper layer, the hole 40f provided on the rearmost side and the hole 40j provided on the foremost side have a length in the front-rear direction smaller than the length of the holes 40g to 44i in the front-rear direction. As shown in fig. 8, a vent hole 41 similar to the vent hole 40 is also provided in the lower portion of the left side surface 15d of the lower case 15. The vent hole 41 is constituted by ten holes 41a to 41j.
As shown in fig. 6, the lower case 15 is provided with four screw holes 46, five front ribs 48, 50, 52, 54, 56, four vent holes 58a to 58d, eight side ribs 60a to 60h, four screw holes 62, and six 2 nd recessed portions 64a to 64f. The four screw holes 46 are provided at positions corresponding to the four screw holes 28 (see fig. 4A) of the upper case 14. The four screw holes 62 are screw holes for fixing the lower case 15 and the battery module 10. The 2 nd recessed portions 64A to 64f are provided at positions corresponding to the 2 nd ridge portions 34A to 34f (see fig. 4A) of the upper case 14, respectively. Bottom surface 15e of lower case 15 is formed of flat portion 16a, protruding portion 16b, recessed portion 16c, and stepped portion 16d. The projecting portion 16b projects upward from the flat portion 16a. As shown in fig. 18, the protruding portion 16b has a shape along the lower surface of the battery cell case 80 described later. As shown in fig. 6, the recessed portion 16c is provided at the corner 15f of the four corners of the bottom surface 15e of the lower case 15. As shown in fig. 19, the stepped portion 16d connects the flat portion 16a and the recessed portion 16c. The stepped portion 16d is lowered downward from the inside of the lower case 15 toward the outside. The thickness t1 of the lower case 15 of the flat portion 16a is the same as the thickness t1 of the lower case 15 of the recessed portion 16c.
As shown in fig. 7, the front ribs 48, 50, 52, 54, 56 are provided on the inclined surface 17b. The front ribs 48, 50, 52, 54, 56 extend upward from the inclined surface 17b and rearward from the front surface 15a of the lower case 15. The rear end of the front rib 48 is substantially aligned with the rear end of the inclined surface 17b, and the upper end of the front rib 48 is substantially aligned with the uppermost end of the inclined surface 17b. The upper surface of the front rib 48 is a flat surface. The rear end of the front rib 50 is substantially aligned with the rear end of the inclined surface 17b, and the upper end of the front rib 50 is located above the upper end of the remaining amount display portion 42a. The front rib 50 is provided with a groove 50a. An LED substrate 84 (see fig. 13A) described later passes through the groove 50a. The rear ends of the front ribs 52, 54 are located forward of the rear end of the inclined surface 17b. The upper ends of the front ribs 52 and 54 are located above the upper end of the remaining amount display portion 42a. The front rib 56 is constituted by a light shielding wall portion 56a and a flat portion 56b. The light shielding wall portion 56a has the same configuration as the front ribs 52, 54. The flat portion 56b has the same configuration as the front rib 48.
The space above the inclined surface 17b is partitioned into four spaces S1 to S4 by the front ribs 48, 50, 56. Specifically, the front rib 48 defines a1 st space S1, the front ribs 48 and 50 define a 2 nd space S2, the front ribs 50 and 56 define a 3 rd space S3, and the front rib 56 defines a 4 th space S4. The spaces S1 to S4 are provided with vent holes 58a to 58d, respectively. The vent holes 58a to 58d penetrate the lower case 15 in the vertical direction. Therefore, the water that has entered the inflow spaces S1 to S4 of the water in the outer case 12 is discharged from the vent holes 58a to 58d.
As shown in fig. 6, the side ribs 60a to 60d extend leftward from the right side surface 15b of the lower case 15. As shown in fig. 8, lower ends of the side ribs 60a to 60d extend upward from the bottom surface 15e of the lower case 15. The upper ends of the side ribs 60a to 60d are located slightly below the upper end of the lower case 15. The side ribs 60a to 60d are provided between the adjacent holes 40 in the front-rear direction. Specifically, the side rib 60a is provided between the holes 40a and 40f and the holes 40b and 40g, the side rib 60b is provided between the holes 40b and 40g and the holes 40c and 40h, the side rib 60c is provided between the holes 40c and 40h and the holes 40d and 40i, and the side rib 60d is provided between the holes 40d and 40i and the holes 40e and 40j. The side ribs 60e to 60h have the same structure as the side ribs 60e to 60h except that they extend rightward from the left side surface 15d of the lower case 15.
(Structure of Battery Module 10)
As shown in fig. 9A, the battery module 10 includes a battery cell case 80, a control board 82, and an LED board 84. The battery cell case 80 is made of an insulating material, for example, a resin material. As shown in fig. 11A, the battery cell case 80 is divided into a right battery cell case 85 and a left battery cell case 86. A vent hole 81a is provided in the front portion 80a of the battery cell case 80, and a vent hole 81b is provided in the rear portion 80b of the battery cell case 80. Thick portions 80c are provided at the corners of the four corners of the lower portion of the battery cell case 80. As shown in fig. 19, the thickness t11 of the thick portion 80c is larger than the thickness t12 of the battery cell holding portion 87 described later. As shown in fig. 11A, the upper surface 80d of the battery cell case 80 has a shape corresponding to a side surface in the longitudinal direction of a battery cell 90 (see fig. 10) described later. A recess 80g is provided in the upper surface 80d of the battery cell case 80 between two adjacent battery cells 90. Four screw bosses 83 used for connecting the control board 82 to the battery cell case 80 are provided on the upper surface 80d of the battery cell case 80. As shown in fig. 9B, projections 116a to 116c projecting upward from the upper surface 80d of the battery cell case 80 are provided on the upper portion of the left side surface 80f of the battery cell case 80. As shown in fig. 11C, the protruding portions 116a to 116C are disposed across two adjacent battery cells 90. The 1 st recessed portions 110a to 110c are provided in the protruding portions 116a to 116 c. The 1 st recessed portions 110a to 110c are provided at positions corresponding to the 1 st protruding portions 30a to 30c (see fig. 4A) of the upper case 14, respectively. As shown in fig. 9A, protruding portions 116d, 116e protruding upward from the upper surface 80d of the battery cell case 80 are provided on the upper portion of the right side surface 80e of the battery cell case 80. As shown in fig. 11C, the protruding portions 116d, 116e are disposed across two adjacent battery cells 90. The 1 st recessed portions 110d and 110e are provided in the protruding portions 116d and 116e. The 1 st recessed portions 110d, 110e are provided at positions corresponding to the 1 st protruding portions 30d, 30e (see fig. 4A) of the upper case 14, respectively. As shown in fig. 11C, when the battery module 10 is viewed in plan, the protruding portions 116a to 116e and the 1 st recessed portions 110a to 110e are provided outside the control board 82. The 1 st recessed portions 110a to 110e are provided between the two leg plates 92 described later. As shown in fig. 9A, the protruding portion 116d and the 1 st recessed portion 110d are provided between the leg plates 92c, 92d, and the protruding portion 116e and the 1 st recessed portion 110e are provided between the leg plates 92d, 92 e. As shown in fig. 9B, the protruding portion 116a and the 1 st recessed portion 110a are provided between the leg plates 92j, 92k, the protruding portion 116B and the 1 st recessed portion 110B are provided between the leg plates 92i, 92j, and the protruding portion 116c and the 1 st recessed portion 110c are provided between the leg plates 92h, 92 i.
As shown in fig. 11B, ten battery cell holders 87a to 87j are provided on the right battery cell case 85. The ten battery cell holding portions 87a to 87j are arranged in upper and lower stages. As shown in fig. 18, which is a cross-sectional view of the battery pack 2 at the center position in the left-right direction, the battery cell holding portions 87a to 87c have: and a center holding portion 89a for holding the center of the battery cell 90 described later. As shown in fig. 19, which is a cross-sectional view of the battery pack 2 at a position where the recessed portion 16c is provided on the right rear side of the lower case 15, the battery cell holding portions 87a to 87c include: and an end face side holding portion 89b for holding the right end face side in the longitudinal direction of the battery unit 90. Although not shown, the cell holding portions 87d and 87e also include a center-side holding portion and an end-face-side holding portion. As shown in fig. 11B, coupling portions 88 for coupling the right battery cell case 85 and the left battery cell case 86 are provided between the battery cell holding portions 87a, 87B, 87f, 87g and between the battery cell holding portions 87d, 87e, 87i, 87j. Although not shown, the left battery cell case 86 is provided with ten battery cell holding portions corresponding to the ten battery cell holding portions 87a to 87j of the right battery cell case 85 and two coupling portions corresponding to the two coupling portions 88 of the right battery cell case 85.
As shown in fig. 10, ten battery cells 90a to 90j are arranged in an upper and lower layer on the battery cell case 80. The battery cell 90 is a cylindrical secondary battery cell, for example, a lithium ion battery cell, having a positive electrode formed at one end and a negative electrode formed at the other end. In the present embodiment, the battery cell 90 is a 18650 type lithium ion battery cell, and has a rated voltage of 3.6[ V ]. The battery cells 90 are arranged such that the directions from the positive electrode to the negative electrode of the battery cells 90 adjacent to each other in the vertical direction are opposite to each other. Of the battery cells 90a to 90e in the lower layer, the rearmost battery cell 90a is disposed such that the right end surface side becomes a negative electrode and the left end surface side becomes a positive electrode. The battery cells 90b to 90e are arranged so that the right end face side becomes a positive electrode and the left end face side becomes a negative electrode. Among the upper battery cells 90f to 90j, the rearmost battery cell 90f is arranged such that the right end surface side thereof serves as a positive electrode and the left end surface side thereof serves as a negative electrode. The battery cells 90g to 90j are arranged such that the right end surface side becomes a negative electrode and the left end surface side becomes a positive electrode. The metal part 91 (see fig. 20, for example) constituting the positive electrode and the metal part constituting the negative electrode of each battery cell 90 are connected to the end face of the battery cell 90. One end of the battery unit 90 is connected to metal leg plates 92a to 92f provided on the right side surface 80e side of the battery unit case 80 via a metal portion (see fig. 9A), and the other end of the battery unit 90 is connected to metal leg plates 92g to 92k provided on the left side surface 80f side of the battery unit case 80 via a metal portion (see fig. 9B). As shown in fig. 20, a waterproof ring 95 is provided on the metal part 91 constituting the positive electrode of the battery unit 90. In fig. 9A and 9B, a circle portion in which a thick line is described on the surface of the lead plate 92 shows that a waterproof ring 95 is disposed inside the circle portion. Therefore, the positive electrode of the battery cell 90 is connected to the round portion of the lead plate 92 where the thick line is described.
As shown in fig. 9A, the plurality of leg plates 92a to 92f are arranged at intervals. Therefore, the plurality of pin plates 92a to 92f are insulated from each other. The leg plate 92a is connected only to the positive electrode of the battery unit 90 f. The leg plate 92f is connected only to the negative electrode of the battery cell 90j. The leg plate 92b connects the two battery cells 90a, 90b adjacent in the front-rear direction. The leg plates 92c to 92e connect two battery cells 90 adjacent in the oblique direction. Specifically, the leg plate 92c is connected to the negative electrode of the battery unit 90g and the positive electrode of the battery unit 90 c. The leg plate 92d is connected to the negative electrode of the battery unit 90h and the positive electrode of the battery unit 90 d. The leg plate 92e is connected to the negative electrode of the battery unit 90i and the positive electrode of the battery unit 90 e.
As shown in fig. 9B, the plurality of leg plates 92g to 92k are arranged at intervals. Therefore, the plurality of pin plates 92g to 92k are insulated from each other. The leg plates 92g to 92k connect the battery cells 90 adjacent in the vertical direction. Specifically, the pin plate 92g connects the negative electrode of the battery cell 90e and the positive electrode of the battery cell 90j. In addition, the pin plate 92h connects the negative electrode of the battery cell 90d and the positive electrode of the battery cell 90 i. In addition, the pin plate 92i connects the negative electrode of the battery cell 90c and the positive electrode of the battery cell 90 h. In addition, the pin plate 92j connects the negative electrode of the battery cell 90b and the positive electrode of the battery cell 90 g. In addition, pin plate 92k connects the positive electrode of battery cell 90a to the negative electrode of battery cell 90 f. According to the above-described structure, ten battery cells 90 are electrically connected in series. Therefore, the rated voltage of the battery pack 2 is 36[ V ]. Although not shown, insulating sheets are attached to the right side surface 80e and the left side surface 80f of the cell case 80.
According to the above configuration, the lead plates 92a and 92f connected to the control board 82 via power supply lines (not shown) can be connected to the upper battery cells 90f and 90j. A current larger than that of the other pin plates flows through the pin plates 92a and 92f connected to the control board 82. Therefore, the width of the toe plates 92a, 92f is desirably large. According to the above configuration, the width of the leg plates 92a and 92f can be sufficiently ensured. In addition, if at least one of the pin plates 92a and 92f connected to the control board 82 is connected to the lower battery cell, it is necessary to wire the power supply line from the lower portion of the battery cell case 60. In the lower portion of the battery cell case 60, the gap between the battery cell case 60 and the right side surface of the outer case 12 is small, and thus it is difficult to wire the power supply line. According to the above configuration, since both the lead plates 92a and 92f connected to the control board 82 are connected to the upper battery cells 90f and 90j, the power supply lines connecting the lead plates 92a and 92f and the control board 82 can be easily wired. Further, compared to the case where at least one of the lead plates 92a, 92f is connected to the battery cell 90 in the lower layer, the length of the current line connecting the lead plates 92a, 92f and the control board 82 can be shortened, and therefore, the resistance generated in the power supply line connecting the lead plates 92a, 92f and the control board 82 can be reduced.
As shown in fig. 10, in a state where ten battery cells 90a to 90j are held in the battery cell case 80, the battery cells 90f to 90j on the upper layer and the battery cells 90a to 90e on the lower layer are arranged at intervals in the vertical direction. Further, gaps are provided between the battery cells 90a, 90b, 90f, and 90g and the rear-side coupling portion 88, and between the battery cells 90d, 90e, 90i, and 90j and the front-side coupling portion 88. Therefore, air that has flowed into the battery cell case 80 through the vent hole 81a or the vent hole 81b of the battery cell case 80 can pass between the upper battery cells 90f to 90j and the lower battery cells 90a to 90e, between the battery cells 90a, 90b, 90f, and 90g and the rear-side coupling portion 88, and between the battery cells 90d, 90e, 90i, and 90j and the front-side coupling portion 88.
As shown in fig. 9A, the control board 82 is disposed above the cell case 80. The control board 82 is disposed along a plane orthogonal to the vertical direction. The control board 82 is fixed to the battery cell case 80 via fasteners 100.
A plurality of terminals 102 are provided on the upper surface of the control board 82. The plurality of terminals 102 are provided with a battery side negative terminal 104a used for discharging or charging, a battery side positive terminal 104b used for discharging or charging, and a plurality of battery side signal terminals 106a to 106d used for transmitting and receiving signals when the battery pack 2 is attached to the electric power tool 200 or the charger 300. The battery side negative electrode terminal 104a and the battery side positive electrode terminal 104b are provided further outward than the battery side signal terminals 106a to 106d in the left-right direction. The battery-side negative electrode terminal 104a is provided on the right side on the control substrate 82, and the battery-side positive electrode terminal 104b is provided on the left side on the control substrate 82. The battery- side signal terminals 106a and 106b are arranged in tandem. The battery- side signal terminals 106c and 106d are arranged in tandem. As shown in fig. 12B, the battery side negative electrode terminal 104a is disposed at a position corresponding to the terminal opening 22a, the battery side signal terminals 106a and 106B are disposed at a position corresponding to the terminal opening 22B, the battery side signal terminals 106c and 106d are disposed at a position corresponding to the terminal opening 22c, and the battery side positive electrode terminal 104B is disposed at a position corresponding to the terminal opening 22d of the upper case 14.
As shown in fig. 9A and 9B, four fixing portions 112 are provided in the battery cell case 80. Each fixing portion 112 is provided at a position corresponding to the screw hole 62 of the lower case 15. As shown in fig. 12A, the lower case 15 and the battery module 10 are fixed to each other by four screws 114.
As shown in fig. 9A, the LED board 84 is connected to the control board 82 via a signal line 120. The LED substrate 84 includes a switch 84b and four LEDs 84a. As shown in fig. 13A, in a state where the battery module 10 and the lower case 15 are fixed, the LED substrate 84 is disposed near the rear surface of the display portion 42 of the lower case 15. Specifically, the LED84a is disposed on the rear surface of the remaining amount display portion 42a, and the switch 84b is disposed on the rear surface of the button 42b. That is, the LED substrate 84 is opposed to the front surface 14a at the inner side of the lower case 15. The LED substrate 84 is inserted into the groove 50a of the front rib 50 of the lower case 15 and placed on the front ribs 48 and 56. Therefore, the LED substrate 84 is held by the lower case 15. Further, the front surface of the LED substrate 84 contacts the rear ends of the front ribs 52, 54 and the light shielding wall portion 56a of the front rib 56. The LED board 84 has vent holes 58a to 58d on a surface thereof facing the lower surface 84c.
Next, with reference to fig. 14 to 17, the engagement gap C1 between the 1 st protruding strip 30 of the upper case 14 and the 1 st recessed portion 110 of the battery module 10 and the engagement gap C2 between the 2 nd protruding strip 34 of the upper case 14 and the 2 nd recessed portion 64 of the lower case 15 will be described.
As shown in fig. 14, the 1 st protrusions 30a to 30e of the upper case 14 are respectively received in the 1 st recesses 110a to 110e of the battery module 10. As shown in fig. 15, an engagement gap C1 is provided between the 1 st protruding strip 30d and the 1 st recessed portion 110 d.
As shown in fig. 16, the 2 nd protrusions 34a to 34f of the upper case 14 are respectively accommodated in the 2 nd recesses 64a to 64f of the lower case 15. As shown in fig. 17, an engagement gap C2 is provided between the 2 nd protruding strip 34e and the 2 nd recessed portion 64 e. The engagement gap C2 is used to position the upper case 14 and the lower case 15. The engagement gap C1 of fig. 14 is used to suppress the misalignment between the upper case 14 and the battery cell case 80. The engagement gap C1 may be set to prevent contact between the upper case 14 and the control board 82 by suppressing misalignment between the upper case 14 and the battery cell case 80. Therefore, the engagement clearance C1 is larger than the engagement clearance C2. As shown in fig. 16, the 2 nd protrusions 34a to 34f and the 2 nd recesses 64a to 64f form a labyrinth structure. This can suppress entry of water into the outer case 12.
Next, referring to fig. 18 and 19, the case gaps C11 to C13 between the lower surface of the cell case 80 of the battery module 10 and the lower case 15 will be described. As described above, fig. 18 shows a cross-sectional view of the battery pack 2 at the center position in the left-right direction, and fig. 19 shows a cross-sectional view of the battery pack 2 at a position where the recessed portion 16c is provided on the right rear side of the lower case 15.
As shown in fig. 18, the lower surface of the battery cell case 80 does not contact the bottom surface 15e of the lower case 15. Specifically, a case gap C11 is provided between a center side holding portion 89a of the cell holding portions 87a to 87C and a protruding portion 16b protruding upward (i.e., inward) from the bottom surface 15e of the lower case 15. Further, a case clearance C12 is provided between the center side holding portion 89a and the flat portion 16a. The case clearance C12 is greater than the case clearance C11.
As shown in fig. 19, a case gap C13 is provided between the end face side holding portion 89b corresponding to the battery cell 90a disposed closest to the corner portion 15f of the lower case 15 and the recessed portion 16C. A step 16d is provided between a surface of the bottom surface 15e of the lower case 15 that faces the side surface 93a of the battery cell 90a and a surface of the battery cell 90b that faces the side surface 93b. In addition, no step portion 16d is provided between a surface of the bottom surface 15e of the lower case 15 that faces the side surface 93b of the battery cell 90b and a surface that faces the side surface 93c of the battery cell 90 c. Therefore, the case clearance C13 is greater than the case clearance C12.
Next, referring to fig. 20, a positional relationship between a battery cell 90c positioned at the center of the lower layer among the plurality of battery cells 90 and holes 40c and 40h provided on the right side of the battery cell 90c will be described. In fig. 20, the leg plate 92i is omitted for easy understanding.
As shown in fig. 20, holes 40c and 40h are provided in the right side surface 15b and at positions facing the end surfaces of the battery unit 90c in the longitudinal direction. In addition, no hole is provided in the right side surface 15b at a position facing the longitudinal end surface of the battery cell 90h located above the battery cell 90 c. The holes 40c and 40h partially face the end surfaces of the battery cell 90h in the longitudinal direction.
A metal portion 91 constituting the positive electrode of the battery unit 90c is provided on the end face on the right side of the battery unit 90 c. The lower end 43h of the hole 40h in the upper layer and the lower end 43c of the hole 40c in the lower layer are provided below the upper end 94a of the cell 90c and the longitudinal axis a1 of the cell 90 c. Lower end 43c of hole 40c in the lower layer is provided below lower end 91a of metal part 91 and lower end 94b of cell 90 c.
Next, the flow of air in the battery pack 2 will be described with reference to fig. 21. For example, assume a situation in which the battery pack 2 is attached to the electric power tool 200, the electric power tool 200 is used by a user, and the battery pack 2 is removed from the electric power tool 200. In this case, the battery pack 2 becomes high in temperature. In such a situation, the vent holes 40 and 41 provided in the lower portion of the lower case 15 shown in fig. 1A, 3, and 8 function as intake holes for introducing air from the outside to the inside of the battery pack 2. Specifically, the air around the battery pack 2 is heated, and the air around the battery pack 2 flows into the battery pack 2 through the vent holes 40 and 41. The air introduced into the battery pack 2 from the vent holes 40 flows into the space between the plurality of battery cells 90 and the lower case 15. As described above, the side ribs 60a to 60d are provided between the holes 40a to 40j. Therefore, as shown in fig. 20, the air introduced through the holes 40c, 40h flows into the space between the battery cells 90c, 90h and the right side surface 15b of the lower case 15. Similarly, air introduced through holes 40a, 40f flows into the space between battery cells 90b, 90g and right side surface 15b of lower case 15, air introduced through holes 40b, 40g flows into the space between battery cells 90b, 90g and right side surface 15b of lower case 15, air introduced through holes 40d, 40i flows into the space between battery cells 90d, 90i and right side surface 15b of lower case 15, and air introduced through holes 40e, 40j flows into the space between battery cells 90e, 90j and right side surface 15b of lower case 15. Therefore, the plurality of battery cells 90 are reliably cooled. The air that has flowed into the space between the plurality of battery cells 90 and the right side surface 15b of the lower case 15 cools the plurality of battery cells 90, and then flows out of the battery pack 2 through the terminal opening 22a of the terminal receiving portion 22 of the upper case 14 and the like. In this way, natural convection occurs in a situation where the battery pack 2 is at a high temperature. The air introduced into the battery pack 2 through the vent holes 41 also flows into the space between each battery cell 90 and the left side surface 15d of the lower case 15, and is used to cool the battery cells 90.
Next, the flow of air in the assembled battery 2 in the state where the assembled battery 2 is attached to the charger 300 will be described with reference to fig. 22 and 23. The charger 300 is provided with a blower fan (not shown) and is configured to suck air from the battery pack 2. In this state, the vent holes 40 (see fig. 1) and 58a to 58d (see fig. 6) of the battery pack 2 function as intake holes for introducing air from the outside of the battery pack 2 to the inside thereof, and the vent hole 26 (see fig. 1) of the battery pack 2 functions as an exhaust hole for exhausting air from the inside of the battery pack 2 to the charger 300.
As shown in fig. 22, when the blower fan of the charger 300 is driven, the air introduced into the battery pack 2 through the vent holes 58 (see fig. 1B) flows into the space between the front portion 80a of the battery cell case 80 and the front surface 15a of the lower case 15. An LED substrate 84 is provided between the front portion 80a of the battery unit case 80 and the front surface 15a of the lower case 15. The air flowing into the space between the front portion 80a of the battery cell case 80 and the front surface 15a of the lower case 15 passes between the front portion 80a of the battery cell case 80 and the LED substrate 84 and the vent holes 81a of the battery cell case 80 to flow into the battery cell case 80. The air introduced into the battery cell case 80 passes between the upper battery cells 90f to 90j and the lower battery cells 90a to 90e, between the battery cells 90a, 90b, 90f, and 90g and the rear-side coupling portion 88, and between the battery cells 90d, 90e, 90i, and 90j and the front-side coupling portion 88. The air passing through the battery cell case 80 cools the plurality of battery cells 90. The air that has cooled the plurality of battery cells 90 is introduced into the charger 300 through the vent holes 81B in the rear portion 80B of the battery cell case 80, the vent holes 26 in the upper case 14, and the vent holes 308 (see fig. 25B) of the charger 300 corresponding to the vent holes 26. As described above, in the state where the battery pack 2 is attached to the charger 300, the charger-side protrusions 306 of the charger 300 are inserted into the battery-side recesses 27 around the vent holes 26. Therefore, the amount of air sucked into the charger 300 from the gap between the battery pack 2 and the charger 300 can be reduced as compared with the case where the battery-side recess 27 is not provided around the vent hole 26. This can increase the amount of air flowing in the battery pack 2. Therefore, the battery cells 90 and the pin plates 92 in the battery pack 2 can be efficiently cooled.
As shown in fig. 23, the air introduced into the battery pack 2 through the vent holes 40 flows into a space between the plurality of battery cells 90 (more specifically, the foot plate 92) and the right side surface 15b of the lower case 15. The air flowing into the space between the battery cell 90 and the right side surface 15b of the lower case 15 flows forward above the plurality of side ribs 60a to 60d, and flows into the space between the front portion 80a of the battery cell case 80 and the front surface 15a of the lower case 15. The flow of air thereafter is the same as in the case of fig. 22. The air introduced through the ventilation holes 58 and 40 is used to cool the plurality of battery cells 90. In addition, in the present embodiment, since the vent hole 40 is provided in the lower portion of the lower case 15, the vent hole 40 is located at a position higher than the height of the charger 300 in a state where the battery pack 2 is mounted on the charger 300. Since dust and the like remain at a low position, dust and the like are less likely to be sucked in a state where the battery pack 2 is attached to the charger 300.
With reference to fig. 24B, an effect of the battery-side recessed portions 23a to 23d of the upper case 14 of the battery pack 2 will be described. Fig. 24B is a cross-sectional view of the battery pack 2 at the center in the front-rear direction of the battery-side signal terminal 106a (see fig. 12A) in a state where the battery pack 2 is attached to the electric power tool 200. As shown in fig. 24B, the terminal holding portion 202 of the electric power tool 200 is provided, and the terminal holding portion 202 is provided with tool-side protrusions 206a to 206d that protrude downward (i.e., toward the battery pack 2). The tool-side protrusions 206a are provided with tool-side negative terminals 208a corresponding to the battery-side negative terminals 104a, and the tool-side protrusions 206d are provided with tool-side positive terminals 208b corresponding to the battery-side positive terminals 104b. The tool-side protrusions 206b are provided with tool-side signal terminals 210a corresponding to the battery-side signal terminals 106 a. In the tool-side protrusions 206b, tool-side signal terminals (not shown) corresponding to the battery-side signal terminals 106b are provided in front of the tool-side signal terminals 210 a. The tool-side protrusions 206c are provided with tool-side signal terminals 210c corresponding to the battery-side signal terminals 106 c. Since the battery-side signal terminal 106d is a terminal used only when the battery pack 2 is attached to the charger 300, the tool-side signal terminal corresponding to the battery-side signal terminal 106d is not provided in front of the tool-side signal terminal 208c in the tool-side protrusion 206 c. When the battery pack 2 is mounted on the power tool 200, the tool-side protrusions 206a to 206d are inserted into the battery-side recesses 23a to 23d, respectively. With this configuration, the creepage distance between two terminals adjacent in the left-right direction among the plurality of terminals of the electric power tool 200 can be made longer as compared with the case where the tool-side protrusions 206a to 206d are not provided on the terminal holding portion 202 of the electric power tool 200. Specifically, the creepage distance can be increased by the height of the tool-side protrusions 206a to 206d. Therefore, it is possible to suppress short-circuiting of two terminals adjacent in the left-right direction among the plurality of terminals of the electric power tool 200.
In one or more embodiments, as shown in fig. 1 to 13B, the battery pack 2 includes: an outer housing 12; a hook member 24; and an LED substrate 84 housed in the outer case 12 and held by the outer case 12. The outer case 12 includes: an upper surface 14b provided with a terminal opening portion 22a for exposing the terminal portion 102; a bottom surface 15 e; front surfaces 14a and 15a extending upward from the bottom surface 15 e; and air holes 58a to 58d open and disposed on the front surface 15a. The hook member 24 is disposed on the front surface 14a of the outer case 12. The LED substrate 84 is disposed at a position facing the front surface 15a. The LED substrate 84 is disposed below the hook member 24, and the ventilation holes 58a to 58d are disposed below the LED substrate 84. According to the above configuration, water entering the outer case 12 is drained from the air vents 58 to 58d provided below the LED board 84. Therefore, even if water penetrates into the outer case 12, water does not remain near the LED substrate 84. Therefore, the water entering the outer case 12 can be prevented from contacting the LED substrate 84.
In one or more embodiments, as shown in fig. 1B, 13A, and 13B, the front surface 15a of the outer case 12 includes an inclined surface 17B inclined with respect to the bottom surface 15e, and the ventilation holes 58a to 58d are provided in the inclined surface 17B. According to the above configuration, water entering the outer case 12 from the hook member 24 and the like can be drained from the vent holes 58a to 58d of the inclined surface 17b. Therefore, the water entering the outer case 12 can be more suppressed from contacting the LED substrate 84. The inclined surface 17b can guide water that has not been discharged from the vent holes 58a to 58d to the bottom surface 15e.
In one or more embodiments, as shown in fig. 9A to 11B, the battery pack 2 further includes: a battery unit 90; and a battery cell case 80 that is housed in the outer case 12 and houses a battery cell 90. The battery cells 90a to 90e are provided in parallel with the bottom surface 15e of the outer case 12. Water that has intruded into outer housing 12 easily remains on bottom surface 15e of outer housing 12. Therefore, the LED substrate 84 is preferably disposed as upward as possible. According to the above configuration, the vent holes 58a to 58d are provided above the lower ends of the battery cells 90a to 90e, and the LED substrate 84 is provided above the vent holes 58a to 58d. Therefore, the LED substrate 84 can be arranged further upward, as compared with the case where the vent holes 58a to 58d are provided lower than the lower ends of the battery cells 90a to 90 e. Therefore, the contact of the LED substrate 84 with water entering the outer case 12 can be further suppressed.
In one or more embodiments, as shown in fig. 1, the upper surface 14b of the outer case 12 may be provided with vent holes 26, and air may be communicated between the vent holes 58a to 58d and the vent holes 26. According to the above configuration, for example, even in a state where the battery pack 2 is attached to the charger 300, the vent holes 58a to 58d can function as air intake holes or air exhaust holes.
In one or more embodiments, as shown in fig. 12 and 13, front ribs 48 to 56 protruding toward the LED substrate 84 are provided on the front surface 15a of the outer case 12, and the space between the LED substrate 84 and the outer case 12 is divided into four spaces S1 to S4 by the plurality of front ribs 48 to 56. The outer case 12 is provided with vent holes 58a to 58d corresponding to the four spaces S1 to S4, respectively. With the above configuration, water is discharged from the four spaces S1 to S4 divided by the front ribs 48 to 56, respectively. Therefore, the contact of the LED substrate 84 with water entering the outer case 12 can be further suppressed.
(corresponding relationship)
The LED substrate 84 is an example of a "substrate". The front surface 14a of the upper housing 14 and the front surface 15a of the lower housing 15 are an example of "sides". The vent holes 58a to 58d and the vent hole 26 are examples of the "1 st opening" and the "2 nd opening", respectively. The front ribs 48 to 56 are an example of "a plurality of projections".
In one or more embodiments, as shown in fig. 1 to 13B, the battery pack 2 may include: an outer housing 12; a battery unit 90; a battery cell case 80 that is housed in the outer case 12 and houses a battery cell 90; and an LED substrate 84 housed in the outer case 12. The outer case 12 includes: an upper surface 14b provided with a terminal opening portion 22a for exposing the terminal portion 102; a bottom surface 15 e; and a front surface 15a extending upward from the bottom surface 15e. The LED board 84 is provided between the battery cell case 80 and the front surface 15a, and is disposed in an orientation orthogonal to the bottom surface 15e. The outer case 12 is provided with vent holes 58a to 58d on a surface facing the lower surface 84c of the LED board 84. According to the above configuration, water that has intruded into the outer case 12 is drained from the vent holes 58a to 58d facing the lower surface 84c of the LED substrate 84. Therefore, even if water enters the outer case 12, water does not remain near the LED substrate 84. Therefore, the water entering the outer case 12 can be prevented from contacting the LED substrate 84.
In one or more embodiments, as shown in fig. 13B, the surface of the outer case 12 facing the lower surface 84c of the LED board 84 is an inclined surface 17B inclined with respect to the bottom surface 15e. According to the above configuration, the water that has entered the outer case 12 and reached the inclined surface 17b is guided toward the bottom surface 15e along the inclined surface 17b. This can prevent water from remaining in the vicinity of the LED substrate 84.
(corresponding relationship)
The LED substrate 84 is an example of a "substrate". The front surface 14a of the upper housing 14 and the front surface 15a of the lower housing 15 are an example of "sides". The vent holes 58a to 58d are examples of "openings".
In one or more embodiments, as shown in fig. 1 to 13B, the battery pack 2 includes: an outer housing 12; and an LED substrate 84 held by the outer case 12. The outer case 12 includes: an upper surface 14b provided with a terminal opening portion 22a for exposing the terminal portion 102; a bottom surface 15 e; and front surfaces 14a and 15a extending upward from the bottom surface 15e. The LED board 84 is provided at a position facing the front surface 15a, and the front surface 15a is provided with vent holes 58a to 58d. According to the above configuration, water that has intruded into the outer case 12 is drained from the vent holes 58a to 58d. Therefore, even if water enters the outer case 12, water does not remain near the LED substrate 84. Therefore, the water entering the outer case 12 can be prevented from contacting the LED substrate 84.
In one or more embodiments, as shown in fig. 12A and 13A, the front surface 15a of the outer case 12 is provided with a plurality of front ribs 48 to 56 protruding toward the LED substrate 84, and the space between the LED substrate 84 and the outer case 12 is divided into four spaces S1 to S4 by the plurality of front ribs 48 to 56. The outer case 12 is provided with vent holes 58a to 58d corresponding to the four spaces S1 to S4, respectively. With the above configuration, water is discharged from the four spaces S1 to S4 divided by the front ribs 48 to 56, respectively. Therefore, the contact of the LED substrate 84 with water entering the outer case 12 can be further suppressed.
In one or more embodiments, as shown in fig. 13B, the front surface 15a includes an inclined surface 17B inclined with respect to the bottom surface 15e. The vent holes 58a to 58d are provided in the inclined surface 17b of the front surface 15a. According to the above configuration, water flowing along the side surface of the 2 nd upward extending surface 17c of the front surface 15a can be drained from the vent holes 58a to 58d of the inclined surface 17b. Therefore, the contact of the LED substrate 84 with water entering the outer case 12 can be further suppressed. The inclined surface 17b can guide water that has not been discharged from the vent holes 58a to 58d to the bottom surface 15e.
(corresponding relationship)
The LED substrate 84 is an example of a "substrate". The vent holes 58a to 58d are examples of "openings". The front surface 14a of the upper housing 14 and the front surface 15a of the lower housing 15 are an example of "sides". The front ribs 48 to 56 are an example of "a plurality of projections".
(embodiment 2)
Referring to fig. 26, a battery pack 602 according to embodiment 2 will be described. For the battery pack 602 of embodiment 2, the configuration of the lower case 615 of the outer case 612 is different from the configuration of the lower case 15 of the outer case 12 of the battery pack 2 of embodiment 1. In the battery pack 602 of the present embodiment, the size and the like of the battery cells (not shown) housed in the outer case 612 are different from those of the battery cells 90 housed in the outer case 12 of embodiment 1. Specifically, the battery cell of the present example was a 21700-type lithium ion battery cell, and the rated voltage was 3.6[ V ]. Accordingly, the outer housing 612 is larger in size than the outer housing 12 of embodiment 1. In addition, ten battery cells are housed in the outer case 612, and the connection method of the battery cells is the same as that of the battery pack of embodiment 1. Therefore, the rated voltage of the battery pack 602 of the present embodiment is also 36[ V ].
As shown in fig. 26, two hook portions 619a, 619b aligned in the front-rear direction are provided on the bottom surface 615e of the lower case 615. With such a configuration, when the user removes the battery pack 2 from the electric power tool 200 or the charger 300, the user can use the hook 619 that is suitable for the length of the finger of the user, of the two hooks 619a and 619b. Therefore, the battery pack 2 can be easily removed from the power tool 200 and the charger 300.
Further features of the battery pack disclosed by the present specification are as follows.
(feature 1)
A battery pack that is slidably attached to an electric power tool, the battery pack comprising:
a1 st terminal;
a 2 nd terminal; and
an outer case for accommodating the 1 st terminal and the 2 nd terminal,
a1 st terminal opening provided at a position corresponding to the 1 st terminal and a 2 nd terminal opening provided at a position corresponding to the 2 nd terminal are provided on an upper surface of the outer case,
battery side recessed portions are provided between the 1 st terminal opening portion and the upper surface and between the 2 nd terminal opening portion and the upper surface.
(feature 2)
In the battery pack according to feature 1, the battery-side recess includes: a shape corresponding to the tool-side protrusion of the power tool.
(feature 3)
In the battery pack recited in feature 1 or 2, the above-mentioned 1 st terminal is a discharge terminal,
the 2 nd terminal is a signal terminal.
(feature 4)
A battery pack is provided with:
a1 st terminal;
a 2 nd terminal;
a 3 rd terminal;
a 4 th terminal; and
an outer case that houses the 1 st terminal, the 2 nd terminal, the 3 rd terminal, and the 4 th terminal,
the outer case includes: a pair of slide rails for sliding the power tool and receiving the power tool,
a1 st terminal opening provided at a position corresponding to a1 st terminal, a 2 nd terminal opening provided at a position corresponding to a 2 nd terminal, a 3 rd terminal opening provided at a position corresponding to a 3 rd terminal, and a 4 th terminal opening provided at a position corresponding to a 4 th terminal are provided on an upper surface of the outer case between the pair of slide rails,
the 1 st terminal opening, the 2 nd terminal opening, the 3 rd terminal opening and the 4 th terminal opening are formed by disposing the 1 st terminal opening, the 2 nd terminal opening, the 3 rd terminal opening and the 4 th terminal opening in this order from one of the pair of slide rails toward the other slide rail,
battery-side depressions are provided between the 1 st terminal opening and the upper surface, between the 2 nd terminal opening and the upper surface, between the 3 rd terminal opening and the upper surface, and between the 4 th terminal opening and the upper surface.
(feature 5)
In the battery pack according to feature 4, the battery-side recess includes: a shape corresponding to the tool-side protrusion of the electric power tool.
(feature 6)
In the battery pack according to feature 4 or 5, the above-mentioned 1 st terminal and 4 th terminal are discharge terminals,
the 2 nd and 3 rd terminals are signal terminals.
(feature 7)
In a battery pack which is attached to an external device so as to be slidable from front to rear,
is provided with an outer shell body,
the outer case includes:
a pair of slide rails for receiving the external device by sliding the external device;
a terminal opening portion provided between the pair of slide rails;
a surface located between the pair of slide rails and behind the terminal opening;
a vent hole; and
and a battery-side recess portion which is provided between the pair of slide rails and between the surface located rearward of the terminal opening portion and the vent hole.
(feature 8)
In the battery pack according to feature 7, the battery-side recess includes: a shape corresponding to the device-side protrusions of the external device.
While specific examples of the present invention have been described in detail, these are merely examples and do not limit the scope of the claims. The techniques recited in the claims include various modifications and changes to the specific examples illustrated above.
(modification 1)
The vent holes 58a to 58d may be provided in the 1 st upward extending surface 17a of the front surface 15a. In this case, the ventilation holes 58a to 58d may be parallel to the bottom surface 15e or may be inclined with respect to the bottom surface 15e.
(modification 2)
The vent holes 58a to 58d may not face the lower surface 84c of the LED substrate 84. In general, the vent holes 58a to 58d may be provided at positions that prevent water that has flowed into the outer case 12 from remaining in contact with the LED substrate 84.
(modification 3)
The substrate held by the battery cell case 80 may be a substrate provided with only a switch without an LED. In another modification, the substrate may be provided with only LEDs without switches.
(modification 4)
Outer housing 12 may not have a plurality of front ribs 48-56. In this modification, there may be one vent hole. In another modification, the vent holes corresponding to all of the spaces S1 to S4 may not be provided. For example, vent holes corresponding only to the spaces S1 and S4 may be provided.
(modification 5)
Front surface 15a may be formed only by an upwardly extending surface extending upward from bottom surface 15e. In another modification, the front surface 15a may be formed only by an inclined surface inclined with respect to the bottom surface 15e.
(modification 6)
The 1 st upper extension surface 17a and the 2 nd upper extension surface 17c of the front surface 15a may be connected by a surface parallel to the bottom surface 15e.
(modification 7)
The lower surface 84c of the LED substrate 84 may face the bottom surface 15e of the lower case 15.
The technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or the drawings can achieve a plurality of objects at the same time, and achieving one of the objects has its own technical effectiveness.

Claims (11)

1. A battery pack is characterized by comprising:
an outer housing;
a hook member; and
a substrate accommodated in the outer case and held by the outer case,
the outer case includes:
an upper surface provided with a terminal opening portion for exposing the terminal;
a bottom surface;
a side surface extending upward from the bottom surface; and
a1 st opening disposed at the side surface,
the hook member is disposed on the side surface of the outer case,
the substrate is disposed at a position opposite to the side surface,
the base plate is arranged below the hook member,
the 1 st opening is provided below the substrate.
2. The battery pack according to claim 1,
the side surface is provided with an inclined portion inclined with respect to the bottom surface,
the 1 st opening is provided to the inclined portion.
3. The battery pack according to claim 1 or 2,
the battery pack further includes:
a battery cell; and
a battery cell case that is housed in the outer case and houses the battery cell,
the battery cell is disposed in parallel with the bottom surface of the outer case,
the 1 st opening is located above a lower end of the battery cell.
4. The battery pack according to claim 1 or 2,
a 2 nd opening is provided on the upper surface of the outer case,
air is communicated between the 1 st opening and the 2 nd opening.
5. The battery pack according to claim 1 or 2,
a plurality of protruding parts protruding toward the substrate side are provided on the side surface,
dividing a space between the base plate and the outer case into two or more spaces by the plurality of protrusions,
the shell body is provided with the 1 st opening respectively corresponding to the more than two spaces.
6. A battery pack is characterized by comprising:
an outer housing;
a battery cell;
a battery unit case that is housed in the outer case and houses the battery unit; and
a substrate accommodated in the outer case,
the outer case includes:
an upper surface provided with a terminal opening portion for exposing the terminal;
a bottom surface; and
a side surface extending upward from the bottom surface,
the substrate is disposed between the battery cell case and the side surface and arranged in a direction orthogonal to the bottom surface,
the outer case has an opening on a surface facing the lower surface of the substrate.
7. The battery pack according to claim 6,
the surface of the outer case facing the lower surface of the substrate is an inclined surface inclined with respect to the bottom surface.
8. A battery pack is characterized by comprising:
an outer housing; and
a base plate held by the outer case,
the outer case includes:
an upper surface provided with a terminal opening portion for exposing the terminal;
a bottom surface; and
a side surface extending upward from the bottom surface,
the substrate is disposed at a position opposite to the side surface,
an opening is provided in the side surface.
9. The battery pack according to claim 8,
the substrate is a substrate provided with an LED, a substrate provided with a switch, or a substrate provided with an LED and a switch.
10. The battery pack according to claim 8 or 9,
a plurality of protruding parts protruding toward the substrate side are provided on the side surface,
dividing a space between the base plate and the outer case into two or more spaces by the plurality of protrusions,
the outer shell is provided with openings respectively corresponding to the more than two spaces.
11. The battery pack according to claim 8 or 9,
the side surface is provided with an inclined portion inclined with respect to the bottom surface,
the opening is provided to the inclined portion.
CN202021799732.9U 2019-09-30 2020-08-25 Battery pack Active CN213026298U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112582746A (en) * 2019-09-30 2021-03-30 株式会社牧田 Battery pack

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Publication number Priority date Publication date Assignee Title
JP2016018605A (en) * 2014-07-04 2016-02-01 株式会社マキタ Power supply device
JP2017168184A (en) 2014-08-07 2017-09-21 三洋電機株式会社 Power supply device
JP6404139B2 (en) 2015-02-13 2018-10-10 株式会社マキタ Battery pack
JP6594649B2 (en) 2015-04-24 2019-10-23 株式会社マキタ Battery pack
JP6821319B2 (en) 2016-04-05 2021-01-27 京セラインダストリアルツールズ株式会社 Charging system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112582746A (en) * 2019-09-30 2021-03-30 株式会社牧田 Battery pack
CN112582746B (en) * 2019-09-30 2024-08-13 株式会社牧田 Battery pack

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