CA2148127C - Battery pack and method of forming same - Google Patents
Battery pack and method of forming sameInfo
- Publication number
- CA2148127C CA2148127C CA002148127A CA2148127A CA2148127C CA 2148127 C CA2148127 C CA 2148127C CA 002148127 A CA002148127 A CA 002148127A CA 2148127 A CA2148127 A CA 2148127A CA 2148127 C CA2148127 C CA 2148127C
- Authority
- CA
- Canada
- Prior art keywords
- outer casing
- casing
- battery pack
- cell
- bonding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
-
- 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
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/302—Particular design of joint configurations the area to be joined comprising melt initiators
- B29C66/3022—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined
- B29C66/30223—Particular design of joint configurations the area to be joined comprising melt initiators said melt initiators being integral with at least one of the parts to be joined said melt initiators being rib-like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7146—Battery-cases
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
A battery pack containing a battery of cells includes an outer casing (402) adapted to receive a battery of cells (404); a bonding surface (410) positioned along the outer casing (402); an inner casing (408) adapted to encapsulate the battery of cells (404) and having a surface for bonding to the bonding surface of the outer casing (402); and a bond provided at the bonding surface to bond the inner casing (408) to the outer casing (402). Also, a method for forming a battery pack comprises steps of positioning a battery of cells within a bonding surface of an outer casing of the battery pack; encapsulating the battery of cells with an inner casing, the inner casing having a surface corresponding to the bonding surface of the outer casing; and bonding the corresponding surface of the inner casing to the bonding surface of the outer casing. The battery pack and method for forming the battery pack reduce the weight and complexity in manufacturing.
Description
BATTERY PACK AND METHOD OF FORMING SAME
Field of the Invention This invention relates generally to battery cell packs, and more specifically to battery pack construction.
1 0 Background Battery packs for portable devices such as two-way radios typically comprise a number of cells having contacts welded together all within a housing. The individual cells are interconnected using sheet metal tabs which are spot welded to the cell terminals. Usually, the interconnected cells are then spot welded to a flex circuit and subsequently inserted into a battery housing. This method of manufacture is wrought with inefficient assembly procedures and unnecessary parts and labor resulting in excessive manufacturing expense and compromised reliability.
Consumer loaded batteries for consumer electronics such as cameras, radios, CD players, etc., typically have spring loaded contacts on one end and metal contacts coupled to the opposite end of the primary cells. Consumer loaded battery packs do not require the extra circuitry typically found in battery packs. Battery packs for portable radios will usually include resistors, thermistors, diodes and other components that enable the battery packs to be rechargeable and/or intrinsically safe. Thus, consumer loaded battery compartments may only have stamped metal on the housing and electrical loss between battery cells and circuitry is of little concern in these applications.
Other battery packs, which are either consumer loaded or loaded and sealed by the manufacturer typically comprise a 2 7 ~
-number of cells that are shrink wrapped together or packaged in a plastic housing. Again, many of these cells are t,vpically coupled together electronically by welding steel tabs to unlike terminals (positive and negative) on separate cells. S~bse~uently, the welded cells are shrink wrapped together and inserted into a housing. Again, this assembly procedure is inefficient, resulting in excessive labor and manufacturing costs.
The drive to reduce weight in el~:tronic consumer products is now impacting battery pack assembly as much as the drive to increase the ease of assembly or manlJf~turability of battery packs. Therefore, the ability to inleg.ale features in less components and parts is critical in reducing the number of assembling steps. Therefore, a need exists for a battery pack that provides the convenience of consumer loaded batter,v packs, provides for a reduction in weight, and allows for greater efficiency and re-llJced cost in assembly and manufacture.
Rrief Descr~plion of the Dr~win~s FIG. 1 is a perspective view of a battery pack.
FIG. 2 is a perspective view of a batter,v pack according to a first embodiment of the present invention.
FIG. 3 is a perspective view of a batter,v pack according to a second embodiment of the presehl invention.
FIG. 4 is a perspective view of a batter,v pack accor~ g to a third embodiment of the present invention.
FIG. 5 is an exploded view of wall 310 taken at lines 5-5 in FIG.4.
FIG. 6 is an exploded view of a first e,nlJod;."ent of an attachment mechanism according to the present invention.
FIG. 7 is an exploded view of a second embodiment of an attachment mechanism according to the present invention.
FIG. 8 is an exploded view of a third embodiment of an attachment mechanism according to the present invention.
FIG. 9 is a perspective view of a batter,v pack according to a fourth embodiment of the present invention.
FIG. 10 is an exploded view of an alignment mechanism according to the present invention.
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7 ~ 7 -;
FIG. 11 is a cross-sectional view of the baKery pack taken at lines 11-11 of FIG. 9.
FIG. 12 is an alternate embodiment of the cross-sectional view of FIG. 1 1.
petailed DescriDtion of the Preferred Fmbodiment A battery pack comprises a first housing member having an integrated latch feature, a header frame detachably mounted to the first housing member, a plurality of cells for insertion into the 10 header frame and first housing member, circuitry on the header for coupling the plurality of cells and providing charger and power contacts, and a second housing member being substantially laminar and being adhesively attached to said first housing member.
Referring to FIG. 1, there is shown a perspective view of a battery pack 10 discussed in US Patent No. 5,180,644 entitled Weldless Battery Pack, issued on January 19, 1993 to Mark S. Bresin, assigned to the present assignee. The battery pack 10 comprises a housing having a top portion 2 and a bottom portion 4. The housing portions are preferably constructed to snap together. Alternatively! the housing portions could be ultrasonically welded together. The top housing member 2 also includes a latch feature 3 that mates with a recessed area 5 in the bottom portion 4 to allow the detachable coupling of the battery pack 10 to a radio (not shown). Within the housing portions 2 and 4, lies a header frame 1 1 (for holding cells 12) being detachably mounted into at least one of the housing portions.
Referring to FIG. 2, there is shown a perspective view of a 30 battery pack 100 in accordance with the present invention. The battery pack 100 preferably comprises a first housing member 104 having a latch feature 103 incorporated or integrated into the first housing member 104. Next, a header frame 111 is mounted into the first housing member 104. The header frame is 35 preferably snapped into the first housing member via the groove 150 in the header and the mating railing 152 within the housing member 104. Alternatively, the header frame t 11 could be WO 95/08848 2 1 ~ 812 ~ PCT/I~S94/08475 integrated as part of the first housing member 104 as well.
Another option is to ultrasonically weld the header frame 111 to the first housing member 104. Battery cells 112 having positive and negative terminals 114 and 113 respectively are then oriented and inserted into the header frame 111. Circuitry means preferably including resistors (not shown), po!yswitches (30), and thermistors (40) are mounted on the header frame 111 to provide charging and power contacts and the appr~p~riate circuitry for safely charging rechargeable battery packs 8S iS known in the art.
1 0 Alternatively, the circuitry means could comprise a flex circuit having some of the components such as the resistors, polyswitches and thermistors, which further interconnects the cells. Finally, a second housing member 102 is preferably adhesively attached to the first housing member. In order to maximize the reduction in weight, the second housing member 102 is preferably a laminar piece of plastic such as polycarbonate having adhesive on itls interior surface for adhering to the first housing member 104. Alternatively, the second housing member 102 could be ultrasonically welded to the first housing member 104. Additionally, the second housing member 102 could serve as a label for the battery 100.
Referring to FIG. 3, there is shown an alternative battery pack 200 in accordance with the present invention. The pack 200 comprises a first housing 202 preferably having snap features 204 integrally formed in the first housing. A plurality of cells 206, pre~erably pre-packaged into a cell pack is placed and retained within the snap features 204. The cell pack also preferably includes a flex circuit 212 providing further interconnection between cells, contacts and other required components such as resistors and thermistors (not shown). Finally a second housing member 220 is placed on top of the cell pack 206 and snaps to the first housing member 202. The Second housing member preferably has openings 214 for retention by the snap features 204. Additionally, openings 216 are formed in the second housing member allowing for contact points when contacts shown on the flex 212 are inserted within the openings 216. Likewise, the first housing member 202 has openings 205 allowing for the 5 ~ ~ 4 ~ ~ 2 7 insertion of contact points shown on the flex 212. Optionally further integrity can be provided to the battery pack 200 by using double sided adhesive (208) (such as tape) between the inner potion of the first housing and the bottom of the cell package 206 and using double sided adhesive (207) between the inner portion of the second housing 220 and the top of the cell package 210.
Referring to FIG. 4, a third embodiment of a battery pack according to the present invention is shown. The battery pack generally includes a base portion or outer casing 302 adapted to hold a battery of cells 304. It will be understood that battery 304 will include any flex strips or circuitry described in earlier embodiment. In order to maintain battery 304 within the outer casing 302, one or more layers of adhesive material 306 could be used. For exa",pl~ adhesive 306 could be a glue or some form of double sided tape. An adhesive layer 306 could be used to attach the battery 304 to the outer case 302. Also, another adhesive layer 306 could be employed on top of the battery to attach an inner casing 308 to maintain battery 304 within outer casing 302.
Generally outer casing 308 is adapted to fit over a wall 310 generally extends around the periphery of outer casing 302.
Wall 310, abutment 311 and any adhesive 306 which may be used prevents battery 304 from shifting within outer casing 302.
Inner casing 308 is co""~osed of a molded thermoformed plastic material or some other suitable ll,ate,ial. r,e~er~l)ly, inner casing 308 includes a label integrally formed in the thermoformed pl~stic Wall 310 prefe,ably includes an energy di,ector 312 (shown in detail in the cross section of FIG. 5 taken at lines 5-S of FIG. 4). Energy director 310 is employed in an ultrasonic bonding technique. In particular a shoulder portion 314 of outer casing 308 can be ultrasonically bonded to energy director 312. The ultrasonic bonding can be provided along the entire wall 310 or at selected portions as needed. Any ultrasonic bonding mechanism which is well known in the art could be used.
Also an attachment mechanism includes a plurality of tab portions 316 positioned around the base of wall 310 to attach inner casing 308 to outer casing 302. Corresponding receiving W 0 95t08848 812 ~ PCT~US94tO847S
portions 318 along a foot 320 are included in outer casing 308. A
variety of embodiments for latch 316/receiving portion 320 are described in detail in reference to FlGs. 6-8. Finally, an adhesive material can be positioned around foot 310 to attach inner casing 308 to outer casing 302. Any one or any combination of the adhesive bonding, ultrasonic bonding and lat~rhg can be used.
Referring to FIG. 6, an exploded view o~f a first embodiment of an attachment mechanism is shown. The-attachment mechanism includes a tab 322 which is generally inserted into a dimple 324. The attachment mechanism of FIG. 6 could be used, for example, to maintain the position of inner casing 308 relative to outer casing 302 when ultrasonic bonding.
Referring to ~IG. 7, an exploded view of a second embodiment of an attachment mechanism is shown. The attachment mechanism includes a tab portion 326 adapted to retain a notch 328 of outer casing 308. The attachment mechanism of FIG. 6 could also be used to maintain the position of inner casing 308 relative to outer casing 302 when ultrasonic bonding.
Finally, referring to FIG. 8, an exploded view of a third embodiment of an attachment mechanism is shown. The attachment mechanism includes a latch 330 adapted to positively engage a hole 332 positioned within the foot 318 of the outer casing 308. In particular, latch 330 includes two portions which can be compressed to engage hole 330. However, it will be understood that other types of latching mechanisms commonly known within the art could be used to positively engage the upper casing.
Turning now to FIG. 9, a perspective view of a battery pack according to a fourth embodiment of the battery pack is shown.
The battery pack generally includes an outer casing 402 adapted to hold a battery of cells 404. In order to maintain battery 404 within the outer casing 402, an adhesive material 406 could be used on either side of the battery. For example, adhesive 406 could be a glue or some form of double sided tape. Finally, an inner casing 408 is included to maintain battery 404 within outer casing 402.
7 ~ 7 '....
Unlike the embodiment of FIG. 4, the embodiment of FIG. 9 does not include a wall 310 to retain the battery from shifting within the outer casing and to provide an energy director to enable ultrasonic binding to the shoulder of the outer casing.
5 Rather, an energy director 410 is provided along the surface of outer casing 402 to provide ultra sonic bonding to foot 412 of outer casing 408. The ultrasonic bonding can be provided along the entire energy director 410 or at selected portions.
Outer casing 402 can optionally include an alignment tab 1 0 414 to enable proper positioning of inner casing 408 relative to outer casing 402 during ullrasonic bonding. The alignment mechanism is shown in detail in FIG.10. Foot 412 includes a notch 415 adapted to receive a tab 414. Flnally, positioning guides 416 can also be selectively positioned to aid the 15 manufacture of the battery. The alignment mechanisms 416 are shown in detail in the cross sections of FlGs.11 and 12 taken at lines 11-11 of FIG. 9 .
Turning now to FIG.11, a cross sectional view taken at lines B-B of FIG. 9 shows the alignment of the inner casing 408 20 with outer casing 402 and the ulll~sonic bonding at energy di~ector 410. In particular, positioning guide 416 provides a re~erence point for inner casing 408. Additionally, an embankment 418 can be inclu~ed to prevent the movement of foot 412 of inner casing 408 during ultrasonic bonding. That is, 25 bec~se the energy director is positioned along an inclined portion of outer casing 402, foot 412, which is norrnally horizontal, is forced into an inclined position during the ultrasonic bonding.
Accwdingly, e"lbankl"ent 418 prevents the movement of foot 412 away from positioning guide 416. Although foot 412 is shown 30 positioned at a particular location along the outer casing 402, it will be understood that energy director 410 be positioned at any location along wall 410.
Tuming to FIG. 12, an alternate embodiment incorporates a leveling surface 420 including the energy director 410. Leveling 35 surface 420 prevents foot 412 from being forced to an inclined position during ultrasonic bonding.
L~
21~8127 _ 8 In summary, the present invention reduces the complexity for manufacturing and the weight of the completed battery. In particular, a combination of ultrasonic bonding and adhesive bonding can reduce the weight and complexity of the device. A
5 wall can contain the battery. An energy director positioned at the top of the wall to contain the cells of a battery can provide a region for ultrasonic bonding. An inner case can be positioned over the wall to seal the battery. A shoulder of the inner casing can be ultrasonically bonded to the energy director at the top of 10 the wall. Alternatively, the wall can be replaced with an energy director positioned on the outer casing wherein a foot of the inner casing is ultrasonically bonded to the energy director.
Accordingly, the present invention reduces complexity and cost compared to prior art devices.
Field of the Invention This invention relates generally to battery cell packs, and more specifically to battery pack construction.
1 0 Background Battery packs for portable devices such as two-way radios typically comprise a number of cells having contacts welded together all within a housing. The individual cells are interconnected using sheet metal tabs which are spot welded to the cell terminals. Usually, the interconnected cells are then spot welded to a flex circuit and subsequently inserted into a battery housing. This method of manufacture is wrought with inefficient assembly procedures and unnecessary parts and labor resulting in excessive manufacturing expense and compromised reliability.
Consumer loaded batteries for consumer electronics such as cameras, radios, CD players, etc., typically have spring loaded contacts on one end and metal contacts coupled to the opposite end of the primary cells. Consumer loaded battery packs do not require the extra circuitry typically found in battery packs. Battery packs for portable radios will usually include resistors, thermistors, diodes and other components that enable the battery packs to be rechargeable and/or intrinsically safe. Thus, consumer loaded battery compartments may only have stamped metal on the housing and electrical loss between battery cells and circuitry is of little concern in these applications.
Other battery packs, which are either consumer loaded or loaded and sealed by the manufacturer typically comprise a 2 7 ~
-number of cells that are shrink wrapped together or packaged in a plastic housing. Again, many of these cells are t,vpically coupled together electronically by welding steel tabs to unlike terminals (positive and negative) on separate cells. S~bse~uently, the welded cells are shrink wrapped together and inserted into a housing. Again, this assembly procedure is inefficient, resulting in excessive labor and manufacturing costs.
The drive to reduce weight in el~:tronic consumer products is now impacting battery pack assembly as much as the drive to increase the ease of assembly or manlJf~turability of battery packs. Therefore, the ability to inleg.ale features in less components and parts is critical in reducing the number of assembling steps. Therefore, a need exists for a battery pack that provides the convenience of consumer loaded batter,v packs, provides for a reduction in weight, and allows for greater efficiency and re-llJced cost in assembly and manufacture.
Rrief Descr~plion of the Dr~win~s FIG. 1 is a perspective view of a battery pack.
FIG. 2 is a perspective view of a batter,v pack according to a first embodiment of the present invention.
FIG. 3 is a perspective view of a batter,v pack according to a second embodiment of the presehl invention.
FIG. 4 is a perspective view of a batter,v pack accor~ g to a third embodiment of the present invention.
FIG. 5 is an exploded view of wall 310 taken at lines 5-5 in FIG.4.
FIG. 6 is an exploded view of a first e,nlJod;."ent of an attachment mechanism according to the present invention.
FIG. 7 is an exploded view of a second embodiment of an attachment mechanism according to the present invention.
FIG. 8 is an exploded view of a third embodiment of an attachment mechanism according to the present invention.
FIG. 9 is a perspective view of a batter,v pack according to a fourth embodiment of the present invention.
FIG. 10 is an exploded view of an alignment mechanism according to the present invention.
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7 ~ 7 -;
FIG. 11 is a cross-sectional view of the baKery pack taken at lines 11-11 of FIG. 9.
FIG. 12 is an alternate embodiment of the cross-sectional view of FIG. 1 1.
petailed DescriDtion of the Preferred Fmbodiment A battery pack comprises a first housing member having an integrated latch feature, a header frame detachably mounted to the first housing member, a plurality of cells for insertion into the 10 header frame and first housing member, circuitry on the header for coupling the plurality of cells and providing charger and power contacts, and a second housing member being substantially laminar and being adhesively attached to said first housing member.
Referring to FIG. 1, there is shown a perspective view of a battery pack 10 discussed in US Patent No. 5,180,644 entitled Weldless Battery Pack, issued on January 19, 1993 to Mark S. Bresin, assigned to the present assignee. The battery pack 10 comprises a housing having a top portion 2 and a bottom portion 4. The housing portions are preferably constructed to snap together. Alternatively! the housing portions could be ultrasonically welded together. The top housing member 2 also includes a latch feature 3 that mates with a recessed area 5 in the bottom portion 4 to allow the detachable coupling of the battery pack 10 to a radio (not shown). Within the housing portions 2 and 4, lies a header frame 1 1 (for holding cells 12) being detachably mounted into at least one of the housing portions.
Referring to FIG. 2, there is shown a perspective view of a 30 battery pack 100 in accordance with the present invention. The battery pack 100 preferably comprises a first housing member 104 having a latch feature 103 incorporated or integrated into the first housing member 104. Next, a header frame 111 is mounted into the first housing member 104. The header frame is 35 preferably snapped into the first housing member via the groove 150 in the header and the mating railing 152 within the housing member 104. Alternatively, the header frame t 11 could be WO 95/08848 2 1 ~ 812 ~ PCT/I~S94/08475 integrated as part of the first housing member 104 as well.
Another option is to ultrasonically weld the header frame 111 to the first housing member 104. Battery cells 112 having positive and negative terminals 114 and 113 respectively are then oriented and inserted into the header frame 111. Circuitry means preferably including resistors (not shown), po!yswitches (30), and thermistors (40) are mounted on the header frame 111 to provide charging and power contacts and the appr~p~riate circuitry for safely charging rechargeable battery packs 8S iS known in the art.
1 0 Alternatively, the circuitry means could comprise a flex circuit having some of the components such as the resistors, polyswitches and thermistors, which further interconnects the cells. Finally, a second housing member 102 is preferably adhesively attached to the first housing member. In order to maximize the reduction in weight, the second housing member 102 is preferably a laminar piece of plastic such as polycarbonate having adhesive on itls interior surface for adhering to the first housing member 104. Alternatively, the second housing member 102 could be ultrasonically welded to the first housing member 104. Additionally, the second housing member 102 could serve as a label for the battery 100.
Referring to FIG. 3, there is shown an alternative battery pack 200 in accordance with the present invention. The pack 200 comprises a first housing 202 preferably having snap features 204 integrally formed in the first housing. A plurality of cells 206, pre~erably pre-packaged into a cell pack is placed and retained within the snap features 204. The cell pack also preferably includes a flex circuit 212 providing further interconnection between cells, contacts and other required components such as resistors and thermistors (not shown). Finally a second housing member 220 is placed on top of the cell pack 206 and snaps to the first housing member 202. The Second housing member preferably has openings 214 for retention by the snap features 204. Additionally, openings 216 are formed in the second housing member allowing for contact points when contacts shown on the flex 212 are inserted within the openings 216. Likewise, the first housing member 202 has openings 205 allowing for the 5 ~ ~ 4 ~ ~ 2 7 insertion of contact points shown on the flex 212. Optionally further integrity can be provided to the battery pack 200 by using double sided adhesive (208) (such as tape) between the inner potion of the first housing and the bottom of the cell package 206 and using double sided adhesive (207) between the inner portion of the second housing 220 and the top of the cell package 210.
Referring to FIG. 4, a third embodiment of a battery pack according to the present invention is shown. The battery pack generally includes a base portion or outer casing 302 adapted to hold a battery of cells 304. It will be understood that battery 304 will include any flex strips or circuitry described in earlier embodiment. In order to maintain battery 304 within the outer casing 302, one or more layers of adhesive material 306 could be used. For exa",pl~ adhesive 306 could be a glue or some form of double sided tape. An adhesive layer 306 could be used to attach the battery 304 to the outer case 302. Also, another adhesive layer 306 could be employed on top of the battery to attach an inner casing 308 to maintain battery 304 within outer casing 302.
Generally outer casing 308 is adapted to fit over a wall 310 generally extends around the periphery of outer casing 302.
Wall 310, abutment 311 and any adhesive 306 which may be used prevents battery 304 from shifting within outer casing 302.
Inner casing 308 is co""~osed of a molded thermoformed plastic material or some other suitable ll,ate,ial. r,e~er~l)ly, inner casing 308 includes a label integrally formed in the thermoformed pl~stic Wall 310 prefe,ably includes an energy di,ector 312 (shown in detail in the cross section of FIG. 5 taken at lines 5-S of FIG. 4). Energy director 310 is employed in an ultrasonic bonding technique. In particular a shoulder portion 314 of outer casing 308 can be ultrasonically bonded to energy director 312. The ultrasonic bonding can be provided along the entire wall 310 or at selected portions as needed. Any ultrasonic bonding mechanism which is well known in the art could be used.
Also an attachment mechanism includes a plurality of tab portions 316 positioned around the base of wall 310 to attach inner casing 308 to outer casing 302. Corresponding receiving W 0 95t08848 812 ~ PCT~US94tO847S
portions 318 along a foot 320 are included in outer casing 308. A
variety of embodiments for latch 316/receiving portion 320 are described in detail in reference to FlGs. 6-8. Finally, an adhesive material can be positioned around foot 310 to attach inner casing 308 to outer casing 302. Any one or any combination of the adhesive bonding, ultrasonic bonding and lat~rhg can be used.
Referring to FIG. 6, an exploded view o~f a first embodiment of an attachment mechanism is shown. The-attachment mechanism includes a tab 322 which is generally inserted into a dimple 324. The attachment mechanism of FIG. 6 could be used, for example, to maintain the position of inner casing 308 relative to outer casing 302 when ultrasonic bonding.
Referring to ~IG. 7, an exploded view of a second embodiment of an attachment mechanism is shown. The attachment mechanism includes a tab portion 326 adapted to retain a notch 328 of outer casing 308. The attachment mechanism of FIG. 6 could also be used to maintain the position of inner casing 308 relative to outer casing 302 when ultrasonic bonding.
Finally, referring to FIG. 8, an exploded view of a third embodiment of an attachment mechanism is shown. The attachment mechanism includes a latch 330 adapted to positively engage a hole 332 positioned within the foot 318 of the outer casing 308. In particular, latch 330 includes two portions which can be compressed to engage hole 330. However, it will be understood that other types of latching mechanisms commonly known within the art could be used to positively engage the upper casing.
Turning now to FIG. 9, a perspective view of a battery pack according to a fourth embodiment of the battery pack is shown.
The battery pack generally includes an outer casing 402 adapted to hold a battery of cells 404. In order to maintain battery 404 within the outer casing 402, an adhesive material 406 could be used on either side of the battery. For example, adhesive 406 could be a glue or some form of double sided tape. Finally, an inner casing 408 is included to maintain battery 404 within outer casing 402.
7 ~ 7 '....
Unlike the embodiment of FIG. 4, the embodiment of FIG. 9 does not include a wall 310 to retain the battery from shifting within the outer casing and to provide an energy director to enable ultrasonic binding to the shoulder of the outer casing.
5 Rather, an energy director 410 is provided along the surface of outer casing 402 to provide ultra sonic bonding to foot 412 of outer casing 408. The ultrasonic bonding can be provided along the entire energy director 410 or at selected portions.
Outer casing 402 can optionally include an alignment tab 1 0 414 to enable proper positioning of inner casing 408 relative to outer casing 402 during ullrasonic bonding. The alignment mechanism is shown in detail in FIG.10. Foot 412 includes a notch 415 adapted to receive a tab 414. Flnally, positioning guides 416 can also be selectively positioned to aid the 15 manufacture of the battery. The alignment mechanisms 416 are shown in detail in the cross sections of FlGs.11 and 12 taken at lines 11-11 of FIG. 9 .
Turning now to FIG.11, a cross sectional view taken at lines B-B of FIG. 9 shows the alignment of the inner casing 408 20 with outer casing 402 and the ulll~sonic bonding at energy di~ector 410. In particular, positioning guide 416 provides a re~erence point for inner casing 408. Additionally, an embankment 418 can be inclu~ed to prevent the movement of foot 412 of inner casing 408 during ultrasonic bonding. That is, 25 bec~se the energy director is positioned along an inclined portion of outer casing 402, foot 412, which is norrnally horizontal, is forced into an inclined position during the ultrasonic bonding.
Accwdingly, e"lbankl"ent 418 prevents the movement of foot 412 away from positioning guide 416. Although foot 412 is shown 30 positioned at a particular location along the outer casing 402, it will be understood that energy director 410 be positioned at any location along wall 410.
Tuming to FIG. 12, an alternate embodiment incorporates a leveling surface 420 including the energy director 410. Leveling 35 surface 420 prevents foot 412 from being forced to an inclined position during ultrasonic bonding.
L~
21~8127 _ 8 In summary, the present invention reduces the complexity for manufacturing and the weight of the completed battery. In particular, a combination of ultrasonic bonding and adhesive bonding can reduce the weight and complexity of the device. A
5 wall can contain the battery. An energy director positioned at the top of the wall to contain the cells of a battery can provide a region for ultrasonic bonding. An inner case can be positioned over the wall to seal the battery. A shoulder of the inner casing can be ultrasonically bonded to the energy director at the top of 10 the wall. Alternatively, the wall can be replaced with an energy director positioned on the outer casing wherein a foot of the inner casing is ultrasonically bonded to the energy director.
Accordingly, the present invention reduces complexity and cost compared to prior art devices.
Claims (10)
1. A battery pack containing at least one cell, comprising:
an outer casing adapted to receive said at least one cell said outer casing having an inner surface;
a bonding surface located on said inner surface of said outer casing;
an inner casing adapted to encapsulate said at least one cell within said outer casing and having a surface for bonding to said bonding surface of said outer casing; and a bond provided at said bonding surface to attach said inner casing to said outer casing within said outer casing.
an outer casing adapted to receive said at least one cell said outer casing having an inner surface;
a bonding surface located on said inner surface of said outer casing;
an inner casing adapted to encapsulate said at least one cell within said outer casing and having a surface for bonding to said bonding surface of said outer casing; and a bond provided at said bonding surface to attach said inner casing to said outer casing within said outer casing.
2. The battery pack of Claim 1 wherein said inner casing is molded thermoformed plastic having a shoulder portion and a foot portion, said bond being provided at said foot portion.
3. The battery pack of Claim 1 wherein said bonding surface includes an energy director for ultrasonic bonding to said inner casing.
4. The battery pack of Claim 1 wherein said bonding surface located on said inner surface of said outer casing includes a wall adapted to contain said battery.
5. A battery pack containing at least one cell, comprising:
an outer casing having an inner surface and a wall projecting from said inner surface and adapted to receive said at least one cell;
a bonding surface located on said outer casing; and an inner casing adapted to cover said wall and at least one cell, wherein said inner casing is bonded to said bonding surface of said outer casing.
an outer casing having an inner surface and a wall projecting from said inner surface and adapted to receive said at least one cell;
a bonding surface located on said outer casing; and an inner casing adapted to cover said wall and at least one cell, wherein said inner casing is bonded to said bonding surface of said outer casing.
6. The battery pack of Claim 5 wherein said bonding surface includes an energy director for ultrasonic bonding to said inner casing.
7. A battery pack containing at least one cell, comprising:
an outer casing adapted to receive said at least one cell;
an energy director positioned along an inner surface of said outer casing; and an inner casing adapted to encapsulate said at least one cell within said outer casing; said inner casing having a foot portion positioned over said energy director, said foot portion being ultrasonically bonded to said energy director.
an outer casing adapted to receive said at least one cell;
an energy director positioned along an inner surface of said outer casing; and an inner casing adapted to encapsulate said at least one cell within said outer casing; said inner casing having a foot portion positioned over said energy director, said foot portion being ultrasonically bonded to said energy director.
8. A method for forming a battery pack comprising the steps of:
forming a bonding surface along an inner surface of an outer casing:
positioning at least one cell within said bonding surface of said outer casing of the battery pack;
encapsulating the at least one cell within said outer casing with an inner casing, the inner casing having a bonding surface corresponding to the bonding surface of the outer casing; and bonding the corresponding bonding surface of the inner casing to the bonding surface of the outer casing.
forming a bonding surface along an inner surface of an outer casing:
positioning at least one cell within said bonding surface of said outer casing of the battery pack;
encapsulating the at least one cell within said outer casing with an inner casing, the inner casing having a bonding surface corresponding to the bonding surface of the outer casing; and bonding the corresponding bonding surface of the inner casing to the bonding surface of the outer casing.
9. The battery pack according to Claim 8 wherein said step of bonding the corresponding bonding surface of the inner casing to the bonding surface of the outer casing includes providing an ultrasonic bond at a foot of the inner casing to an energy director positioned on the outer casing.
10. A battery pack containing at least one cell, comprising:
an outer casing having a wall projecting from an inner surface thereof and adapted to receive said at least one cell;
an energy director positioned along an inner surface of said outer casing adjacent said wall; and an inner casing formed of a thermoformed plastic substantially conforming to the shape of said wall and adapted to encapsulate said at least one cell within said outer casing; said inner casing having a foot portion positioned over said energy director, said foot portion being ultrasonically bonded to said energy director.
an outer casing having a wall projecting from an inner surface thereof and adapted to receive said at least one cell;
an energy director positioned along an inner surface of said outer casing adjacent said wall; and an inner casing formed of a thermoformed plastic substantially conforming to the shape of said wall and adapted to encapsulate said at least one cell within said outer casing; said inner casing having a foot portion positioned over said energy director, said foot portion being ultrasonically bonded to said energy director.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12377593A | 1993-09-20 | 1993-09-20 | |
| US08/123,775 | 1993-09-20 | ||
| PCT/US1994/008475 WO1995008848A1 (en) | 1993-09-20 | 1994-07-25 | Battery pack and method of forming same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2148127A1 CA2148127A1 (en) | 1995-03-30 |
| CA2148127C true CA2148127C (en) | 1999-05-11 |
Family
ID=22410814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002148127A Expired - Fee Related CA2148127C (en) | 1993-09-20 | 1994-07-25 | Battery pack and method of forming same |
Country Status (22)
| Country | Link |
|---|---|
| JP (1) | JPH08504053A (en) |
| KR (1) | KR0148202B1 (en) |
| CN (1) | CN1053997C (en) |
| BE (1) | BE1008690A5 (en) |
| BR (1) | BR9405605A (en) |
| CA (1) | CA2148127C (en) |
| DE (2) | DE4497133C2 (en) |
| DK (1) | DK55695A (en) |
| ES (1) | ES2115512B1 (en) |
| FI (1) | FI952469A (en) |
| FR (1) | FR2710456B1 (en) |
| GB (1) | GB2288057B (en) |
| HK (1) | HK1005760A1 (en) |
| HU (1) | HUT76813A (en) |
| IT (1) | IT1272812B (en) |
| LU (1) | LU88616A1 (en) |
| NL (1) | NL9420010A (en) |
| NO (1) | NO951560L (en) |
| PL (1) | PL175456B1 (en) |
| SE (1) | SE9501861L (en) |
| TW (1) | TW477469U (en) |
| WO (1) | WO1995008848A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3014293B2 (en) * | 1995-04-18 | 2000-02-28 | インターナショナル・ビジネス・マシーンズ・コーポレイション | Battery pack |
| US5534366A (en) * | 1995-11-22 | 1996-07-09 | Motorola, Inc. | Modular battery pack |
| GB2309819B (en) * | 1996-01-31 | 1998-06-17 | Nokia Mobile Phones Ltd | Radio telephone battery pack |
| DE19715545B4 (en) * | 1997-04-15 | 2010-07-01 | Sennheiser Electronic Gmbh & Co. Kg | Battery compartment, microphone and electronic device |
| WO2000016416A1 (en) * | 1998-09-11 | 2000-03-23 | Matsushita Electric Industrial Co., Ltd. | Battery pack |
| JP4214450B2 (en) * | 2002-06-03 | 2009-01-28 | 日本電気株式会社 | module |
| TWI398978B (en) * | 2010-06-25 | 2013-06-11 | Simplo Technology Co Ltd | Method for manufacturing battery case |
| CN102569910B (en) * | 2012-02-29 | 2015-07-08 | 艾诺斯(江苏)华达电源***有限公司 | Self-locking footing of fork truck storage battery |
| KR102028168B1 (en) * | 2012-08-20 | 2019-10-02 | 삼성에스디아이 주식회사 | Battery pack having external member |
| JP6328503B2 (en) * | 2014-07-04 | 2018-05-23 | 株式会社マキタ | Power supply |
| US9893329B2 (en) * | 2014-07-04 | 2018-02-13 | Makita Corporation | Electronic power supply device |
| KR102471092B1 (en) * | 2019-07-18 | 2022-11-24 | 주식회사 엘지에너지솔루션 | Battery module, method of manufacturing the same and battery pack |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5786265U (en) * | 1980-11-14 | 1982-05-27 | ||
| US5015546A (en) * | 1989-06-12 | 1991-05-14 | Grid Systems Corporation | Battery compartment |
| JPH03145195A (en) * | 1989-10-31 | 1991-06-20 | Toshiba Corp | Portable type electronic equipment |
| US5096788A (en) * | 1990-10-05 | 1992-03-17 | Motorola, Inc. | Weldless battery pack |
| US5104754A (en) * | 1990-10-05 | 1992-04-14 | Motorola, Inc. | Weldless battery pack |
| US5149603A (en) * | 1990-12-27 | 1992-09-22 | Pacesetter Infusion, Lts. | Battery pack for medical instruments |
| US5180644A (en) * | 1992-03-09 | 1993-01-19 | Motorola, Inc. | Weldless battery pack |
| US5298347A (en) * | 1992-09-14 | 1994-03-29 | Motorola, Inc. | Battery pack |
| US5326651A (en) * | 1992-11-03 | 1994-07-05 | Motorola, Inc. | Weldless battery pack with wiping contacts |
| US5302110A (en) * | 1993-03-19 | 1994-04-12 | Motorola, Inc. | Unitized battery package |
-
1994
- 1994-07-25 KR KR1019950702047A patent/KR0148202B1/en not_active IP Right Cessation
- 1994-07-25 DE DE4497133A patent/DE4497133C2/en not_active Expired - Fee Related
- 1994-07-25 JP JP7509749A patent/JPH08504053A/en active Pending
- 1994-07-25 CN CN94190700A patent/CN1053997C/en not_active Expired - Fee Related
- 1994-07-25 DE DE4497133T patent/DE4497133T1/en active Pending
- 1994-07-25 BR BR9405605-6A patent/BR9405605A/en not_active IP Right Cessation
- 1994-07-25 HU HU9501472A patent/HUT76813A/en unknown
- 1994-07-25 WO PCT/US1994/008475 patent/WO1995008848A1/en not_active IP Right Cessation
- 1994-07-25 CA CA002148127A patent/CA2148127C/en not_active Expired - Fee Related
- 1994-07-25 PL PL94308996A patent/PL175456B1/en unknown
- 1994-07-25 NL NL9420010A patent/NL9420010A/en not_active Application Discontinuation
- 1994-07-25 ES ES09550019A patent/ES2115512B1/en not_active Expired - Fee Related
- 1994-07-25 GB GB9509719A patent/GB2288057B/en not_active Expired - Fee Related
- 1994-08-25 FR FR9410293A patent/FR2710456B1/en not_active Expired - Fee Related
- 1994-09-19 IT ITRM940592A patent/IT1272812B/en active IP Right Grant
- 1994-09-20 BE BE9400846A patent/BE1008690A5/en not_active IP Right Cessation
-
1995
- 1995-01-10 TW TW089212558U patent/TW477469U/en not_active IP Right Cessation
- 1995-04-25 NO NO951560A patent/NO951560L/en unknown
- 1995-05-16 DK DK055695A patent/DK55695A/en not_active Application Discontinuation
- 1995-05-19 LU LU88616A patent/LU88616A1/en unknown
- 1995-05-19 FI FI952469A patent/FI952469A/en unknown
- 1995-05-19 SE SE9501861A patent/SE9501861L/en not_active Application Discontinuation
-
1998
- 1998-06-04 HK HK98104876A patent/HK1005760A1/en not_active IP Right Cessation
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| EEER | Examination request | ||
| MKLA | Lapsed |