Bus bar to sensor wire attachment using a blind rivet
Systems and methods that provide an improved mechanism for attaching a sensor wire to a bus bar in a battery module are disclosed. A battery module according to the present disclosure may include a bus bar comprising a rivet hole and a plurality of battery cells electrically coupled to the bus bar. The battery module may also include a sensor wire comprising a terminal end, as well as a blind rivet passing through the rivet hole of the bus bar and coupling the bus bar to the terminal end of the sensor wire. Attaching the sensor wire to the bus bar with a blind rivet may provide one or more of the following mechanical advantages: fast assembly, robustness for low power applications, elimination of the need to wait for an adhesive to cure, and elimination of the need for double-sided access of the bus bar.
1. A battery module comprising:
a bus bar comprising a rivet hole;
at least two battery cells electrically coupled to the bus bar;
a sensor wire comprising a terminal end;
a blind rivet passing through the rivet hole and coupling the bus bar to the terminal end of the sensor wire, wherein the blind rivet comprises a rivet head adjacent to the terminal end of the sensor wire and a mandrel head adjacent to the bus bar; and
an adhesive applied over the rivet head or the mandrel head.
2. The battery module of claim 1 , wherein:
the terminal end of the sensor wire comprises a ring terminal; and
the blind rivet passes through the ring terminal.
3. The battery module of claim 2 , wherein the blind rivet provides a compression force to the bus bar and the ring terminal, thereby forming an electrically conductive bond.
4. The battery module of claim 1 , wherein:
the terminal end of the sensor wire forms a loop; and
the blind rivet passes through the loop.
5. The battery module of claim 4 , wherein the blind rivet provides a compression force to the bus bar and the loop, thereby forming an electrically conductive bond.
6. The battery module of claim 1 , wherein:
the blind rivet comprises a mandrel head, a rivet shaft, and a rivet head;
the rivet shaft passes through the bus bar; and
the terminal end is adjacent to the rivet head.
7. The battery module of claim 1 , wherein the adhesive is applied over the rivet head.
8. The battery module of claim 1 , wherein the adhesive is applied the mandrel head.
9. The battery module of claim 1 , wherein the sensor wire comprises a voltage sense wire.
10. The battery module of claim 1 , further comprising an additional bus bar, wherein:
a first terminal of a battery cell of the at least two battery cells is electrically coupled to the bus bar; and
a second terminal of the battery cell is electrically coupled to the additional bus bar.
11. The battery module of claim 10 , wherein the additional bus bar is coupled to an additional sensor wire with an additional blind rivet.
12. The battery module of claim 11 , further comprising a voltage sensing module coupled to the sensor wire and the additional sensor wire, wherein the voltage sensing module monitors voltage using the sensor wire and the additional sensor wire.
13. The battery module of claim 1 , wherein the at least two battery cells are electrically connected in parallel.
14. The battery module of claim 1 , wherein:
the at least two battery cells are electrically coupled to the bus bar along a length-wise dimension of the bus bar; and
the rivet hole is located along the length-wise dimension of the bus bar.
15. The battery module of claim 1 , wherein the blind rivet extends beyond the bus bar and the ring terminal by an amount in the range of 1 to 5 millimeters.
16. A method of manufacturing a battery monitoring system, comprising:
providing a bus bar comprising a rivet hole;
providing a at least two battery cells;
coupling the at least two battery cells to the bus bar;
providing a sensor wire comprising a terminal end;
providing a blind rivet;
passing the blind rivet through the terminal end of the sensor wire and the rivet hole;
activating the blind rivet to couple the terminal end of the sensor wire to the bus bar, wherein the activated blind rivet comprises a rivet head adjacent to the terminal end of the sensor wire and a mandrel head adjacent to the bus bar; and
applying an adhesive over the rivet head or the mandrel head.
17. The method of claim 16 , wherein the terminal end of the sensor wire comprises one of a ring terminal and a loop of wire.
18. The method of claim 16 , further comprising applying an adhesive over the rivet head and the mandrel head.
19. The method of claim 16 , further comprising coupling the sensor wire to a battery monitoring system.
20. The method of claim 16 , wherein the sensor wire comprises a voltage sense wire.