Impact absorbing member for a conformal wearable battery
A battery system that is formed from a plurality of battery cells arranged on a flexible printed circuit card, where the flexible printed circuit card is folded along an axis forming an upper and lower portion of the flexible circuit card. A visco-elastic shock-absorbing member installed between the upper and lower portion of the flexible circuit card. Each battery cell may also have a visco-elastic shock-absorbing member that is attached individually to each battery cell of the plurality of battery cells.
1. A conformal wearable battery comprising:
a plurality of non-cylindrical shaped polymer battery cells; and
a flexible printed circuit board (PCB) comprising:
a plurality of physical connection sections disposed in a grid like pattern, wherein each of the plurality of battery cells is physically affixed to the flexible PCB at a corresponding physical connection section of the plurality of physical connection sections; and
a bend axis that facilitates folding of the flexible PCB to form an upper portion of the flexible PCB and a lower portion of the flexible PCB;
a visco-elastic central shock-absorbing member positioned between the upper portion and the lower portion of the flexible PCB preventing the upper portion from contacting the lower portion, wherein the central shock-absorbing member electrically insulates the upper portion from the lower portion; and
a flexible housing that includes an internal cavity that receives the plurality of battery cells, the flexible PCB, and the central shock-absorbing member.
2. The conformal wearable battery of claim 1 , further comprising:
a plurality of visco-elastic battery cell shock-absorbing members, each battery cell shock-absorbing member of the plurality of battery cell shock-absorbing members being individually attached to an outward facing surface of each battery cell, wherein each battery cell shock-absorbing member has an opening that is substantially aligned with a center of a pouch cell portion of each battery cell.
3. The conformal wearable battery of claim 2 , wherein the opening has an area that is within a range of 30 percent and 70 percent of an area of a front surface of the battery cell shock-absorbing member, wherein the area of the front surface is defined as the area of the front surface that is free of the opening.
4. The conformal wearable battery of claim 2 , wherein at least one battery cell shock-absorbing member of the plurality of battery cell shock-absorbing members contacts an interior surface of the housing.
5. The conformal wearable battery of claim 2 , wherein a thickness of the central shock-absorbing member is substantially the same as a thickness of one of the plurality of battery cell shock-absorbing members.
6. The conformal wearable battery of claim 2 , wherein a thickness of the central shock-absorbing member is within a range of 1.2 and 1.4 times a thickness of one of the plurality of battery cell shock-absorbing members.
7. The conformal wearable battery of claim 1 , wherein the central shock-absorbing member is continuous and extends at least 90 percent of a width of the upper portion of the flexible PCB.
8. The conformal wearable battery of claim 1 , wherein a thickness of the central shock-absorbing member is within a range of 2 percent and 5 percent of a thickness of the conformal wearable battery, wherein the thickness of the conformal wearable battery is a distance from an outermost outward facing surface of an upper housing member to an outermost outward facing surface of a lower housing member.
9. The conformal wearable battery of claim 2 , wherein the central shock-absorbing member is the same material as a battery cell shock-absorbing member of the plurality of battery cell shock-absorbing members, and wherein the central shock-absorbing member comprises polyurethane.
10. A conformal wearable battery comprising:
a plurality of battery cells; and
a flexible printed circuit board (PCB) comprising:
a plurality of physical connection sections, wherein each of the plurality of battery cells is physically affixed to the flexible PCB at a corresponding physical connection section of the plurality of physical connection sections;
a bend axis that facilitates folding of the flexible PCB to form an upper portion of the flexible PCB and a lower portion of the flexible PCB;
a plurality of battery cell shock-attenuating members, each battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members being individually attached to an outward facing surface of each battery cell, wherein each battery cell shock-attenuating member is a foam member and has an opening that extends through the battery cell shock-attenuating member; and
a housing that includes an upper housing member, a lower housing member, and an internal cavity, wherein the internal cavity that receives the plurality of battery cells, the flexible PCB, and the plurality of battery cell shock-attenuating members,
wherein a first battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members contacts an interior surface of the lower housing member and a second battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members contacts an interior surface of the upper housing member.
11. The conformal wearable battery of claim 10 , wherein when a battery cell of the plurality of battery cells increases in volume, one of a battery cell shock-attenuating member of the plurality of shock-attenuating members is compressed.
12. The conformal wearable battery of claim 10 , wherein a thickness of a battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members is within a range of 4 percent and 12 percent of a thickness of a battery cell of the plurality of battery cells.
13. The conformal wearable battery of claim 10 , wherein the opening of the plurality of battery cell shock-attenuating members has an oval shape.
14. The conformal wearable battery of claim 10 , further comprising:
a central shock-attenuating member, the central shock-attenuating member positioned between the upper portion and the lower portion of the flexible PCB preventing the upper portion from contacting the lower portion, wherein the central shock-attenuating member electrically insulates the upper portion from the lower portion.
15. The conformal wearable battery of claim 14 , wherein a thickness of the central shock-attenuating member is substantially the same as a thickness of a battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members.
16. A system comprising:
a plurality of battery cells; and
a flexible printed circuit board (PCB) comprising:
a plurality of physical connection sections, wherein each of the plurality of battery cells is physically affixed to the flexible PCB at a corresponding physical connection section of the plurality of physical connection sections;
a bend axis that facilitates folding of the flexible PCB to form an upper portion of the flexible PCB and a lower portion of the flexible PCB;
a central shock-attenuating member formed from a polymeric foam material, the central shock-attenuating member positioned between the upper portion and the lower portion preventing the upper portion of the flexible PCB from contacting the lower portion of the flexible PCB;
a plurality of battery cell shock-attenuating members formed from a polymeric foam material, each battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members being individually attached to an outward facing surface of each battery cell of the plurality of battery cells; and
a housing that includes an internal cavity, wherein the internal cavity receives the plurality of battery cells, the flexible PCB, the central shock-attenuating member, and the plurality of battery cell shock-attenuating members, wherein a battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members contacts an interior surface of the housing.
17. The system of claim 16 , wherein when a battery cell of the plurality of battery cells increases in volume, one of a battery cell shock-attenuating member of the plurality of shock-attenuating members or the central shock-attenuating member is compressed.
18. The system of claim 16 , wherein when a battery cell of the plurality of battery cells increases in volume, the battery cell that increases in volume expands into a cavity formed by an opening in each battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members.
19. The system of claim 16 , wherein a thickness of a battery cell shock-attenuating member of the plurality of battery cell shock-attenuating members is within a range of 4 percent and 12 percent of a thickness of a battery cell of the plurality of battery cells.
20. The system of claim 16 , wherein the central shock-attenuating member contacts both inward facing surfaces of the upper portion and the lower portion of the flexible PCB.