Battery terminals for a lithium ion battery module
A lithium ion (Li-ion) battery module includes a module terminal configured to electrically couple the Li-ion battery module to an electrical connector of an external load. The module terminal includes a conductive component and a sealing shim secured to the conductive component, the sealing shim being formed from a polymeric material. The Li-ion battery module includes a housing containing a plurality of Li-ion battery cells and having an opening through which the conductive component of the module terminal at least partially protrudes. The sealing shim of the module terminal is directly secured to the housing and forms a seal isolating an interior of the housing from the external environment.
1. A lithium ion (Li-ion) battery module, comprising:
a module terminal configured to electrically couple the Li-ion battery module to an electrical connector of an external load, wherein the module terminal includes a conductive component and a sealing shim secured to the conductive component, the sealing shim being formed from a polymeric material, wherein the module terminal includes a first conductive component and a second conductive component secured to one another, and wherein the conductive component of the module terminal is a portion of the first conductive component;
a housing containing a plurality of Li-ion battery cells and having an opening through which the conductive component of the module terminal at least partially protrudes, wherein the first conductive component is a terminal post assembly and the second conductive component is a terminal bus bar configured to electrically couple to the plurality of Li-ion battery cells, and wherein the terminal post assembly includes a terminal base, a terminal post extending from the terminal base as the portion of the first conductive component, and a protruding portion extending from the terminal base in an opposite direction from the terminal post and in electrical contact with the terminal bus bar; and
wherein the sealing shim of the module terminal is directly secured to the housing by a laser weld surrounding the opening and forms a seal isolating an interior of the housing from the external environment, and wherein the terminal base includes a shelf portion extending radially beyond the protruding portion, and the sealing shim is compressed between the shelf portion and a flat region of the terminal bus bar; and
wherein a portion of the housing having the opening is transparent to a laser used to form the laser weld.
2. The Li-ion battery module of claim 1 , wherein the sealing shim is not directly secured to the flat region of the terminal bus bar.
3. The Li-ion battery module of claim 1 , wherein the sealing shim extends radially beyond the shelf portion of the terminal post assembly, and the sealing shim is positioned between the flat region of the terminal bus bar and an interior surface of the housing to form the seal such that there is no direct connection between a periphery of the shelf portion and a periphery of the opening in the housing.
4. The Li-ion battery module of claim 3 , wherein the sealing shim is directly secured to the interior surface of the housing by a through weld.
5. The Li-ion battery module of claim 1 , wherein the housing includes a first housing portion holding the plurality of Li-ion battery cells in a fixed position and a second housing portion secured to the first housing portion, and wherein the sealing shim is directly secured to an interior surface of the second housing portion.