Prior art — US Patent 11923498

The most relevant prior art for US patent 11923498, "Lithium-ion battery having desirable safety performance," is identified by examining the patent's own citations. According to 35 U.S.C. § 102, prior art must generally predate the invention's effective filing date. The priority date for US11923498 is listed as January 17, 2014.

The patent itself identifies two key prior art references in its background section:

Chinese patent publication CN 202495523U
- Publication/Filing Date: February 27, 2012 (filing date)
- Brief Description: This patent discloses a lithium-ion battery that defines a recess on a positive plate and/or the negative plate to receive a lead therein to reduce the battery's thickness.
- Potential Anticipated Claims: This reference potentially anticipates elements of claim 1 relating to a positive electrode active material layer with a first recess accommodating a positive lead, and a negative electrode active material layer with a second recess accommodating a negative lead. The patent explicitly states that CN 202495523U reduces battery thickness by using recesses for leads. However, US11923498 differentiates itself by addressing the safety and performance issues (e.g., internal short circuit, lithium precipitation, unstable bonding, high internal resistance, and capacity issues) that arise from this prior art structure, particularly when the recess is at one end of the plate and when using expansive active materials like silicon. US11923498 introduces insulating glue layers and specific placement of the recesses to mitigate these problems.
Chinese patent publication CN 201087907Y
- Publication/Filing Date: March 23, 2007 (filing date)
- Brief Description: Similar to CN 202495523U, this patent also discloses a lithium-ion battery with a recess on a positive plate and/or negative plate to receive a lead.
- Potential Anticipated Claims: This reference also potentially anticipates elements of claim 1 concerning the use of recesses in electrode active material layers to accommodate leads. Like the previous Chinese patent, the distinguishing features of US11923498 would be the insulating glue layers and the strategic placement of the recesses to enhance safety and performance, which CN 201087907Y does not describe as solving.

The present patent (US11923498) aims to improve upon these prior art solutions by introducing specific features, such as insulating glue layers on the positive lead and on the positive film corresponding to the negative lead, and by positioning the recesses in the middle portion of the plates, especially when using expansive negative active materials like silicon. These additions are designed to address the safety and performance deficiencies identified in the background of US11923498 regarding earlier recess-based designs.