Integrated battery pack with lead frame connection
An integrated battery package, that contains semiconductor chips, for example to control and regulate battery charging and to monitor the package operation, uses a single lead frame to interconnect several internal chips, to internally connect said control chips to the battery and to connect the whole package assembly externally. The invention eliminates the need for any additional connecting mechanism. The invention uses established production processes. A molding process, similar to plastic chip encapsulation, encloses the battery controlling chips and forms at the same time the body of the battery package. An additional cover, sealed to said body, closes the battery package.
1. A process to form an integrated battery package, comprising:
providing one or more battery cells inside the package, one or more semiconductor chips to control the battery operation, a single lead frame, mechanically carrying and electrically connecting to said semiconductor chips, connecting to said battery cells inside the package and providing the connectors to the package outside, a plastic mold, encapsulating said semiconductor chips and the inner area of said lead frame and said plastic mold forming, at the same time, the supporting structure of said integrated battery package;
forming some of the leads of said lead frame into a form to build the battery contacts
forming some of the leads of said lead frame into a form to build the external contacts of said battery package;
mounting said semiconductor chips to said lead frame;
connecting said semiconductor chips to said lead frame;
molding a plastic material around said semiconductor chips and the inner area of said lead frame; and
forming, through the mechanical design of the mold, the supporting structure of said integrated battery package.
2. The process of claim 1 wherein some of the leads of said lead frame are preformed during said lead frame's production process.
3. The process of claim 1 wherein some of the leads of said lead frame are preformed in a separate bending process, but before the various chips are mounted.
4. The process of claim 1 wherein some of the leads of said lead frame are formed in a separate bending process, after the various chips are mounted and the after said molding process, encapsulating said semiconductor chips and said inner area of said lead frame.
5. The process of claim 1 wherein said lead frame is made with metal stamping.
6. The process of claim 1 wherein the lead frame is made with metal etching.
7. The process of claim 1 wherein said leads preformed into a position matching the battery contacts are welded to said battery.
8. The process of claim 1 wherein said leads preformed into a position matching the battery contacts are fixed to said battery with conductive adhesive material.
9. The process of claim 1 wherein additional passive components are mounted to said lead frame and are electrically connected to said semiconductor chip through said lead frame.
10. The process of claim 1 wherein one or more additional case elements form the top cover of the case of said battery package and enclose all internal components and connections, including the semiconductor to battery connection, only leaving the essential external connections being exposed outside said case.
11. The process of claim 10 wherein said additional case elements forming the top cover of the case of said battery package are fixed and sealed to said bottom part of the case of said battery package with a sealing adhesive.