8 results about "Retention capacity" patented technology

The application belongs to the technical field of batteries, and particularly relates to a positive pole piece and a battery. The positive pole piece comprises a substrate, a first coating layer and a second coating layer. The first coating layer is arranged on one side surface of the substrate, and the second coating layer is arranged on the surface of the first coating layer away from the substrate. The positive pole piece satisfies the following relationship: A = beta1*H1*R(H1+H2) / (beta1*H1+beta2*H2), 6 < A < 17.5. The positive pole piece provided by the embodiment of the application quantitatively restricts the thickness of the first coating layer, the porosity of the first coating layer, the resistance of the first coating layer, the thickness of the second coating layer and the porosity of the second coating layer through a formula, controls the value of A in the above range, can simultaneously restrict mechanical safety and electrolyte retention capacity, can not only ensure the passing of the needle test, but also can improve the liquid retention amount of the battery cell, thereby improving the cycle performance of the battery cell, and enabling the battery cell to have a smaller energy density loss.

The utility model provides a soft package battery shell, a battery and a battery pack, the soft package battery shell comprises a first shell, the first shell is a semi-closed shell with an opening, the first shell is provided with a first accommodating cavity used for accommodating a battery cell, the first shell is provided with a plurality of side surfaces surrounding the opening, and the first accommodating cavity is provided with a second accommodating cavity used for accommodating the battery cell; at least one side face protrudes in the direction away from the first containing cavity to form an expansion groove. According to the utility model, the expansion slot is formed on the side surface in a protruding manner, the soft package battery can generate thermal expansion in the charging and discharging process, and the expansion slot can form an effective buffer area on the side surface when the battery is subjected to heat expansion, so that the phenomenon that the battery shell on the side surface is torn and damaged due to thickness expansion during battery circulation is improved; meanwhile, the expansion slot is formed in the side surface and can increase the storage capacity of electrolyte of the battery shell, so that the liquid retention capacity of the soft package battery is improved, the later cycle performance of the soft package battery can be improved, and the quality of the soft package battery is improved.

The utility model provides a battery pole piece and a battery, the battery pole piece comprises a current collector and a coating, the coating is arranged on the surface of at least one side of the current collector in the thickness direction, the coating is provided with a plurality of first groove structures and a plurality of second groove structures, the plurality of first groove structures are arranged at intervals along the length direction of the current collector, and the plurality of second groove structures are arranged at intervals along the length direction of the current collector. At least part of the second groove structures are arranged between the two adjacent first groove structures, and the thickness of the first groove structures is larger than that of the second groove structures. According to the battery pole piece disclosed by the invention, the first groove structure and the second groove structure are arranged on the coating arranged on the current collector, and the first groove structure and the second groove structure which are different in thickness are matched to accommodate the electrolyte, so that the infiltration and liquid retention capabilities of the battery pole piece are improved; therefore, the problem that the use performance and the service life of the battery are affected due to poor wettability and poor liquid retention capacity of the battery pole piece in the prior art is solved.

The invention relates to the technical field of batteries, and particularly discloses a diaphragm structure which has a first direction, a second direction and a third direction which are perpendicular to one another, the diaphragm structure is provided with an embossed area and a non-embossed area, and the non-embossed area surrounds the embossed area; in the third direction, the embossing area is provided with a plurality of embossments, and the plurality of embossments are arranged at intervals in the first direction and the second direction; in the second direction, the distance between every two adjacent knurls is L3, and the distance between every two adjacent knurls in the first direction is L4; the L3 and the L4 meet the condition that L3 is equal to L4. The invention also provides a battery cell and a battery. The knurling is arranged in the knurling area of the diaphragm structure to replace the knurling of the pole piece, so that the damage to the coating material of the pole piece can be avoided, and the knurling is arranged in the diaphragm structure to form a distance in the battery cell, so that the pores in the battery cell are improved, and the liquid retention capacity and the infiltration capacity are improved.

The invention relates to a lithium ion battery storage life acceleration test method, which comprises the following steps: S1, carrying out capacity calibration on batteries in the same batch, and recording the initial capacity; s2, charging to a target SOC, storing for 30 days at a set temperature, and measuring the voltage and internal resistance before storage; s3, standing for 5 hours after storage, measuring voltage and internal resistance after storage, and testing retention capacity and recovery capacity; and S4, circularly executing the steps S2-S3 until the recovery capacity is less than or equal to 80% of the initial capacity. Through the multi-SOC / temperature cycle storage test, the voltage drop, the internal resistance growth rate and the capacity recovery rate are quantified, and the test period is greatly shortened.

The invention belongs to the technical field of batteries, and particularly relates to a positive pole piece and a battery. The positive pole piece comprises a base material, a first coating and a second coating, the first coating is arranged on the surface of one side of the base material, and the second coating is arranged on the surface, away from the base material, of the first coating; the positive pole piece meets the following relational expression: A = beta1 * H1 * R (H1 + H2) / (beta1 * H1 + beta2 * H2), wherein 6 < A < 17.5; according to the positive pole piece provided by the embodiment of the invention, the thickness of the first coating, the porosity of the first coating, the resistance of the first coating, the thickness of the second coating and the porosity of the second coating are quantitatively restrained through a formula, and the numerical value of A is controlled within the range, so that the mechanical safety and the electrolyte retention capability can be restrained at the same time; and the passing of the acupuncture test can be ensured, and the liquid retention capacity of the battery cell can be improved, so that the cycle performance of the battery cell is improved, and the battery cell has relatively small energy density loss.

This application discloses a battery comprising a cell and a liquid storage device. The cell has corresponding first and second surfaces. The liquid storage device is configured to store a portion of the battery's electrolyte and includes a first liquid storage portion disposed on the second surface. The cell has a positive tab and a negative tab, which are disposed on the first surface, or the positive and negative tabs are located on adjacent sides of the cell, with one of them disposed on the first surface. This not only increases the battery's liquid retention capacity without reducing its energy density, but also facilitates the battery's ability to feed back to the cell during the later stages of long-cycle operation, improving the battery's cycle performance and preventing performance degradation caused by residual electrolyte accumulating at the bottom of the battery casing.

The utility model belongs to the technical field of batteries, and particularly relates to a pole piece, a battery cell and a secondary battery. Wherein the pole piece comprises a current collector and an active material layer connected to at least one side surface of the current collector; at least one avoiding groove is formed in the active material layer; the avoiding grooves respectively penetrate through the active material layer and the current collector; when the pole piece is in a winding state, the current collector is provided with at least one corner section and at least one straight section which are alternately arranged; and the avoiding grooves are formed in the corner sections. According to the utility model, the problem of low electrolyte retention capacity can be solved, and the cycle performance of the battery is improved.