Power supply modules having a uniform DC environment
First Claim
1. A method of mitigating battery characteristic divergence within a battery pack, the method comprising:
- selecting multiple batteries from among a quantity of available batteries based on their individual loaded output resistance and charge acceptance characteristics, each of the selected batteries having a positive terminal; and
connecting the selected batteries in parallel in a battery pack, wherein the positive terminal of each of the selected batteries is connected to a positive power terminal of the battery pack through a respective one of a set of conductive paths, each path having an identical electrical resistance and extending from the positive terminal of the battery pack to the positive terminal of the respective battery;
wherein both matching voltage levels at the positive terminal of each battery in the connected batteries and equal charge-transfer rates in each of the connected batteries are maintained while transferring charge to or from the connected batteries.
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Accused Products
Abstract
A battery pack connection scheme is shown that provides an synchronized DC environment for every cell in the pack, such that every cell in the same or similar voltage level in the pack sees exactly the same voltage and current environment. In some embodiments, a pack is provided having a positive load connection terminal and multiple batteries connected in parallel to the terminal. The connections are made via respective conductive paths each including a high-power DC precision cable segment, each of the conductive paths having a resistance suitable to allow an average charge acceptance rate of the battery pack to be greater than a one-hour, or “C1”, charge rate. The precision cable segments preferably have matching impedances, or have matching DC resistances.
63 Citations
13 Claims
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1. A method of mitigating battery characteristic divergence within a battery pack, the method comprising:
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selecting multiple batteries from among a quantity of available batteries based on their individual loaded output resistance and charge acceptance characteristics, each of the selected batteries having a positive terminal; and connecting the selected batteries in parallel in a battery pack, wherein the positive terminal of each of the selected batteries is connected to a positive power terminal of the battery pack through a respective one of a set of conductive paths, each path having an identical electrical resistance and extending from the positive terminal of the battery pack to the positive terminal of the respective battery; wherein both matching voltage levels at the positive terminal of each battery in the connected batteries and equal charge-transfer rates in each of the connected batteries are maintained while transferring charge to or from the connected batteries. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification