Provided herein are electrochemical cells and/or electrode stacks comprising an interlayer disposed proximate to the negative electrode current collector and/or a metal negative electrode, wherein the interlayer is disposed between and in contact with a negative electrode current collector and a solid-state electrolyte separator or between and in contact with a metal negative electrode and a solid-state electrolyte separator.

A secondary battery includes: a cylindrical can; an electrode assembly in the cylindrical can with an electrolyte, the electrode assembly including a cathode and an anode; a cap assembly coupled to a top of the cylindrical can; and a plate-shaped upper insulating plate between the electrode assembly and the cap assembly. The upper insulating plate includes: a main layer having a plurality of pores extending between an upper surface and a lower surface thereof; and an auxiliary layer adhered to at least one surface of the main layer and partially melted by the electrolyte.

A cap assembly for a battery, comprising: a connector, the connector comprising a central part, a peripheral part, and a transition part between the former two parts, wherein a current interrupt device is disposed on the central part; a pressure relief piece and electrically connected to the connector via the current interrupt device; and an internal insulating washer, wherein an insulating coating is applied to the peripheral part and transition part of the connector. The insulating coating can prevent reconnection of the connector to the pressure relief piece in the case of an external short circuit and improve the short circuit safety of the battery. The present disclosure further includes a method for making a connector for the cap assembly and to a battery comprising the cap assembly.

A cap assembly for a battery, comprising: a connector, the connector comprising a central part, a peripheral part, and a transition part between the former two parts, wherein a current interrupt device is disposed on the central part; a pressure relief piece and electrically connected to the connector via the current interrupt device; and an internal insulating washer, wherein an insulating coating is applied to the peripheral part and transition part of the connector. The insulating coating can prevent reconnection of the connector to the pressure relief piece in the case of an external short circuit and improve the short circuit safety of the battery. The present disclosure further includes a method for making a connector for the cap assembly and to a battery comprising the cap assembly.

A composite electrode plate of increased robustness and with better electrical properties for incorporation in a battery cell includes a composite current collector, a positive active material layer, a negative active material layer, a first isolation layer, and a second isolation layer. The composite current collector is disposed between the positive active material layer and the negative active material layer. The first isolation layer connects to a surface of the positive active material layer away from the composite current collector. The second isolation layer connects to a surface of the negative active material layer away from the composite current collector.

A partition plate for use in an electrochemical device, an electrochemical device, and an electronic device are disclosed. The partition plate for use in an electrochemical device is ion-insulative and includes an intermediate layer and a sealing layer. The sealing layer is located on an upper surface and a lower surface of the intermediate layer. A material of the intermediate layer includes at least one of a carbon material, a first polymer material, or a metal material. A material of the sealing layer includes a second polymer material. A temperature at which the sealing layer starts to soften is at least 10° C. lower than a temperature at which the intermediate layer starts to soften. Three layers of superimposed composite films ensure ion insulation and sealing reliability.

Methods, apparatus, systems, and articles of manufacture to increase stacking pressure in battery cells are disclosed. A disclosed battery includes an anode layer and a cathode layer stacked with the anode layer. The disclosed battery further includes a tension bearing structure to extend through at least one of the anode layer or the cathode layer.

An electrochemical device includes a first electrode assembly, a second electrode assembly, and a packaging shell. The first electrode assembly and the second electrode assembly B are each located in a separate cavity in the packaging shell. Two opposite-polarity tabs of the first electrode assembly and the second electrode assembly are connected in the packaging shell. The connected two opposite-polarity tabs comprise a first tab extending out of the packaging shell. Such design of extending the tabs and the design of ion insulation between the hermetic cavities improve the charge and discharge performance and the product quality of the electrochemical device.

An electrochemical device includes a first electrode assembly, a second electrode assembly, and a packaging shell. The first electrode assembly and the second electrode assembly B are each located in a separate cavity in the packaging shell. Two opposite-polarity tabs of the first electrode assembly and the second electrode assembly are connected in the packaging shell. The connected two opposite-polarity tabs comprise a first tab extending out of the packaging shell. Such design of extending the tabs and the design of ion insulation between the hermetic cavities improve the charge and discharge performance and the product quality of the electrochemical device.

The disclosed technology relates to a battery utilizing a dampening layer to prevent a failure of the battery. The battery includes an enclosure, a set of electrodes enclosed within the enclosure, and a dampening layer disposed within the set of electrodes. The dampening layer partitions the set of electrodes into a first subset of electrodes and a second subset of electrodes. The dampening layer is configured to absorb a mechanical impact on the enclosure to prevent a failure of at least one of the first subset of electrodes and the second subset of electrodes. The dampening layer may be formed at least one of a polymer, metal, and ceramic.