IP Library › Granted Patent US 9,450,216
Granted Patent B2
US 9,450,216 · App. 13/586,139 · Granted Sep 20, 2016

Intrinsically safe battery pack

Inventor: William B. Kiger (Hoschton, GA)
Assignee: MOTOROLA SOLUTIONS, INC.
H01M2/0413H01M2/1016H01M2/1094H01M10/425Y10T29/49108
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 9,450,216
App. No.
13/586,139
Granted
Sep 20, 2016
Kind
B2
Abstract

An intrinsically safe battery pack assembly ( 200 ) is formed by disposing electrical components ( 208 ) on a single side of a printed circuit board (PCB) ( 210 ) and coating the component side of the PCB with a low pressure molded encapsulation ( 220 ). The bottom surface of the PCB provides interface contacts for a charger and radio. The LPM encapsulation is formed over the top side of the PCB to cover the electrical components at a predetermined height set to be at the height of the tallest component. The top surface of the PCB having the electrical components and LPM encapsulation ( 220 ) is oriented to face the plurality of battery cells within the battery pack ( 200 ).

Claims (45)

1. A battery pack, comprising:

a plurality of battery cells;

a printed circuit board (PCB) having top and bottom surfaces;

electrical components disposed on the top surface of the PCB;

a plurality of charger interface contacts and radio interface contacts disposed on the bottom surface of the PCB;

a low pressure mold (LPM) encapsulation formed only over the top side of the PCB, the LPM encapsulation covering the electrical components at a predetermined height that covers the tallest electrical component;

the top surface of the PCB having the electrical components and LPM encapsulation being oriented to face the plurality of battery cells within the battery pack;

spacers coupled to the cell stack; and

wherein the PCB surface covered with the LPM encapsulation is seated upon the spacers.

2. The battery pack of claim 1 , further comprising:

an insulator disposed between the LPM and the plurality of battery cells.

3. The battery pack of claim 1 , wherein the PCB comprises components disposed upon a single surface, the single surface being the top surface.

4. The battery pack of claim 1 , further comprising components disposed upon both bottom and top surfaces of the PCB.

5. The battery pack of claim 1 , wherein the LPM encapsulation is injection molded over the top surface of the PCB.

6. The battery pack of claim 1 , wherein the LPM encapsulation is formed of a polyamide material.

7. The battery pack of claim 1 , wherein PCB and the LPM encapsulation have apertures formed there through to provide a pass through for mating the electrical components to the plurality of battery cells.

8. The battery pack of claim 1 , wherein the battery pack is formed without a flex, a flex connector, a flex insulator, and a PCB insulator.

9. The battery pack of claim 1 , wherein the battery pack provides ATEX compliance with public safety communication products.

10. A battery pack, comprising:

a battery cell;

a printed circuit board (PCB) having top and bottom surfaces;

electrical components disposed on the top surface of the PCB;

interface contacts disposed on the bottom surface of the PCB, the interface contacts electrically coupling to the electrical components and the battery cell;

a low pressure mold (LPM) encapsulation formed only over the top side of the PCB, the LPM encapsulation covering the electrical components at a predetermined height that covers the tallest electrical component;

the top surface of the PCB having the electrical components disposed thereon and LPM encapsulation being oriented to the battery cell;

spacers coupled to the cell stack; and

wherein the PCB surface coated with the LPM encapsulation is seated upon the spacers.

11. The battery pack of claim 10 , further comprising:

an insulator coupled between the LPM encapsulation and the battery cell.

12. The battery pack of claim 11 , wherein the insulator is adhesively coupled between the LPM encapsulation and the battery cell.

13. The battery pack of claim 10 , wherein the interface contacts comprise:

radio and charger interface contacts disposed on the bottom surface of the PCB.

14. The battery pack of claim 10 , wherein the battery pack operates with ATEX compliant communication products.

15. The battery pack of claim 10 , wherein the LPM encapsulation is either a polyamide material or a polyolefin material.

16. A method for forming a battery pack, the method comprising:

disposing a plurality of electrical components on a top side of a printed circuit board (PCB), thereby forming a component side;

coating only the component side of the PCB with a low pressure molded (LPM) encapsulation, the LPM encapsulation covering the electrical components at a predetermined height that covers the tallest electrical component on the PCB;

providing a cell stack having at least one battery cell; and

orienting and coupling the top surface of the PCB having the plurality of electrical components and the LPM encapsulation to face cell stack;

coupling spacers to the cell stack; and

seating the PCB surface coated with the LPM encapsulation upon the spacers.

17. The method of claim 16 , further comprising disposing charger interface contacts and radio interface contacts on a bottom side of the PCB.

18. The method of claim 16 , further comprising coupling the LPM encapsulation to the cell stack using an adhesive spacer.

19. The method of claim 16 , wherein LPM is coated to the PCB using injection molding.

20. The method of claim 16 , wherein the battery pack is formed without a flex, a flex connector, a flex insulator, and a PCB insulator.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 15, 2012
From: KIGER, WILLIAM B.
To: MOTOROLA SOLUTIONS, INC.
Reel/Frame 028790/0359 →
Continuity (1)
Related Publication 20140050945A1 · Feb 20, 2014