Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein, about 2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 6, about 30 wt %?Z?about 50 wt %, and about 0.01?(Y/Z)?about 0.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein, about 2 wt %?(X+Y)?about 11 wt %, about 1?(X/Y)?about 6, about 40 wt %?Z?about 50 wt %, and about 0.01<(Y/Z)?about 0.3; wherein the trinitrile compound comprises at least one selected from the group consisting of 1,3,5-pentanetricarbonitrile; 1,2,3-propanetrinitrile, 1,3,6-hexanetricarbonitrile; 1,2,6-hexanetricarbonitrile, 1,2,3-tris(2-cyanoethoxy)propane; 1,2,4-tris(2-cyanoethoxy)butane, 1,1,1-tris(cyanoethoxymethylene)ethane, 1,1,1-tris(cyanoethoxymethylene)propane, 3-methyl-1,3,5-tris(cyanoethoxy)pentane, 1,2,7-tris(cyanoethoxy)heptane, 1,2,6-tris(cyanoethoxy)hexane, and 1,2,5-tris(cyanoethoxy)pentane.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein about 2.2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 6, 1 wt %<Y<5 wt %, about 30 wt %?Z?about 50 wt %, and about 0.02<(Y/Z)?about 0.3.

Abstract: A battery cell, including a first electrode plate, a second electrode plate, a separator, and a first electrode tab. The separator is disposed between the first electrode plate and the second electrode plate. The first electrode plate, the second electrode plate, and the separator are wound along a length direction of the first electrode plate. The first electrode tab is located at an end in a width direction of the first electrode plate. In the length direction of the first electrode plate, the first electrode plate includes a first edge, and a first notch is disposed at the first edge.

Abstract: A battery including a housing, an electrode assembly, and tabs. The housing includes a first end wall, a second end wall, and a connecting wall portion. Both the first end wall and the second end wall are L-shaped and spaced apart in a thickness direction of the battery. The connecting wall portion extends from an edge of the first end wall toward the second end wall and encloses an L-shaped accommodating cavity, where the first end wall is provided as one end of the accommodating cavity, and the second end wall is provided as another end of the accommodating cavity.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein, about 2.2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 2.3, about 5 wt %?Z?about 50 wt %, 1 wt %<Y<5 wt %, and about 0.02?(Y/Z)?about 0.3; wherein the dinitrile compound is one or more compounds selected from butanedinitrile, adiponitrile, 1,4-dicyano-2-butene, and ethylene glycol bis(2-cyanoethyl) ether; and the trinitrile compound is one or more compounds selected from 1,3,6-hexanetricarbonitrile, 1,2,6-hexanetricarbonitrile and 1,2,3-tris(2-cyanoethoxy)propane.

Abstract: An electrode assembly formed by winding a stack. The stack includes a first conductive layer, a second conductive layer, and a first layer disposed therebetween. The stack further includes a first surface, a first end portion, and a second end portion located opposite to the first end portion. A stacking direction of the stack is a first direction. Viewed along the first direction, the first surface has, in a second direction perpendicular to the first direction, a first region located on one side of the first end portion and a second region located on the other side of the first end portion. In a winding direction of the stack, the first region is closer to the first end portion than the second region.

Abstract: An electrochemical apparatus including a housing, an electrode assembly provided in the housing, and a first conductive plate. The electrode assembly includes a first electrode plate including a first area and a second area stacked in a first direction. A first electrode tab and a second electrode tab are respectively connected to the first area and the second area. The first conductive plate is electrically connected to the first electrode tab and the second electrode tab. The first electrode tab includes a first connection area including a first end connected to the first area and a second connection area. The first direction has a first side from the second area to the first area and a second side from the first area to the second area. The first connection area extends from the first end to the first side and is provided obliquely relative to the first direction.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein, about 2.2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 2.3, about 5 wt %?Z?about 50 wt %, 1 wt %<Y<5 wt %, and about 0.02<(Y/Z)?about 0.3; wherein the trinitrile compound comprises at least one selected from the group consisting of 1,3,5-pentanetricarbonitrile; 1,2,3-propanetrinitrile, 1,3,6-hexanetricarbonitrile; 1,2,6-hexanetricarbonitrile, 1,2,3-tris(2-cyanoethoxy)propane; 1,2,4-tris(2-cyanoethoxy)butane, 1,1,1-tris(cyanoethoxymethylene)ethane, 1,1,1-tris(cyanoethoxymethylene)propane, 3-methyl-1,3,5-tris(cyanoethoxy)pentane, 1,2,7-tris(cyanoethoxy)heptane, 1,2,6-tris(cyanoethoxy)hexane, and 1,2,5-tris(cyanoethoxy)pentane.

Abstract: An electrode assembly includes a stacked portion and a second layer. The stacked portion includes a first layer disposed between a first conductive layer and a second conductive layer. The stacked portion is a wound structure including a first surface and a first end portion. The second layer is connected to the first surface. When viewed in the first direction, the first surface has a first region located on a first side of the first end portion and a second region located on a second side of the first end portion. In a second direction perpendicular to the first direction, the first side and the second side are located on two opposite sides of the first end portion. When viewed in a winding direction of the stacked portion, the second region is closer to the first end portion than the first region.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein about 2.2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 6, 1 wt %?Y<5 wt %, about 5 wt %?Z?about 50 wt %, and about 0.02<(Y/Z)?about 0.3. The electrolyte further includes at least one selected from the group consisting of a cyclic carbonate ester having a carbon-carbon double bond, a fluorinated chain carbonate ester, a fluorinated cyclic carbonate ester, and a compound having a sulfur-oxygen double bond.

Abstract: A negative electrode including a negative electrode active material layer and an additive. The additive includes a metal sulfide. The additive is distributed in the negative electrode active material layer, and/or distributed on the surface of the negative electrode active material layer. The negative electrode effectively improves the performance of the lithium ion battery, and greatly improves the capacity and cycle performance of the lithium ion battery.

Abstract: A battery includes a housing; an insulation member; and a first active substance layer and a second active substance layer having opposite polarities. The housing includes a first wall body, a second wall body, and a third wall body, forming an accommodation cavity. The first wall body is a conductive wall body and disposed opposite to the third wall body. The insulation member, the first active substance layer, and the second active substance layer are accommodated in the accommodating cavity. The second active substance layer is disposed on a surface of the first wall body that faces the third wall body. The first active substance layer is disposed between the second active substance layer disposed on the surface of the first wall body and the third wall body. The insulation member is disposed between the first active substance layer and the second active substance layer.

Abstract: A battery including a first conductive part, an electrode assembly, a second conductive part, and a first layer. The first conductive part includes a cover part and a concave part connected to the cover part. The concave part includes a first wall and a first side wall connected to the first wall. The electrode assembly is electrically connected to the first conductive part and the second conductive part, and is configured inside the concave part. Viewed in a first direction, the second conductive part and the electrode assembly partly overlap, the second conductive part is located in the first conductive part, the second conductive part includes a first surface and a second surface, and the second surface faces away from the first conductive part. The first layer includes a part located between the first conductive part and the second conductive part; and an insulating material.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein, about 2.2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 2.3, about 5 wt %?Z?about 50 wt %, 1 wt %<Y<5 wt %, and about 0.02?(Y/Z)?about 0.3; wherein the dinitrile compound is one or more compounds selected from butanedinitrile, adiponitrile, 1,4-dicyano-2-butene, and ethylene glycol bis(2-cyanoethyl) ether; and the trinitrile compound is one or more compounds selected from 1,3,6-hexanetricarbonitrile, 1,2,6-hexanetricarbonitrile and 1,2,3-tris(2-cyanoethoxy)propane.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z; where about 2 wt %?(X+Y)?about 11 wt %, about 0.1?(X/Y)?about 8, and about 0.01?(Y/Z)?about 0.3. The dinitrile compound comprises a compound of Formula (5): N—R2—(O—R3)n—O—R4—CN (5). The electrolyte is capable of effectively inhibiting the increase in DC internal resistance of an electrochemical device so that the electrochemical device has excellent cycle and storage performance.

Abstract: An electrochemical device, including an electrode and an electrolyte. The electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z. Wherein about 2 wt %?(X+Y)? about 11 wt %, about 0.1?(X/Y)? about 8. The electrode including a coating, which including a single-sided sub-coating and a double-sided coating, the electrode with the single-sided sub-coating has an electrode compaction density D1, and the electrode with the double-sided coating has an electrode compaction density D2, where about 0.8?D1/D2? about 1.2. The electrolyte and D1/D2 of the electrodes has a significant effect on the cycle performance of the electrochemical device.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein, about 2.2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 2.3, about 5 wt %?Z?about 50 wt %, 1 wt %<Y<5 wt %, and about 0.02<(Y/Z)?about 0.3; wherein the trinitrile compound comprises at least one selected from the group consisting of 1,3,5-pentanetricarbonitrile; 1,2,3-propanetrinitrile, 1,3,6-hexanetricarbonitrile; 1,2,6-hexanetricarbonitrile, 1,2,3-tris(2-cyanoethoxy)propane; 1,2,4-tris(2-cyanoethoxy)butane, 1,1,1-tris(cyanoethoxymethylene)ethane, 1,1,1-tris(cyanoethoxymethylene)propane, 3-methyl-1,3,5-tris(cyanoethoxy)pentane, 1,2,7-tris(cyanoethoxy)heptane, 1,2,6-tris(cyanoethoxy)hexane, and 1,2,5-tris(cyanoethoxy)pentane.

Abstract: An electrolyte including a dinitrile compound, a trinitrile compound, and propyl propionate. Based on the total weight of the electrolyte, the weight percentage of the dinitrile compound is X, the weight percentage of the trinitrile compound is Y, and the weight percentage of the propyl propionate is Z, wherein, about 2.2 wt %?(X+Y)?about 8 wt %, about 0.1?(X/Y)?about 2.3, about 5 wt %?Z?about 50 wt %, 1 wt %<Y<5 wt %, and about 0.02?(Y/Z)?about 0.3; wherein wherein the dinitrile compound is one or more compounds selected from the group consisting of butanedinitrile, adiponitrile, and 1,4-dicyano-2-butene; and the trinitrile compound is one or more compounds selected from the group consisting of 1,3,6-hexanetricarbonitrile, 1,2,6-hexanetricarbonitrile and 1,2,3-tris(2-cyanoethoxy)propane.

Abstract: A battery including a first conductor and a first conductive material layer. The first conductor includes a first surface and a second surface. The first surface and the second surface are two opposite surfaces of the first conductor. The first conductive material layer is disposed on the first surface. The first conductive material layer includes a first recess. The first conductor further includes a first region and a second region. A first preset spacing exists between the first region and the second region. The first region is exposed from the first recess. The second region is provided without the first conductive material layer. The battery further includes a first conductive plate. In the second region, the first conductor is connected to the first conductive plate.