Lithium battery, battery box and vehicle

Abstract

The invention relates to a lithium battery, a battery box and a vehicle, and belongs to the technical field of batteries, and the lithium battery comprises a plurality of battery cells which are connected in series through an intermediate tab; each battery cell is packaged in different sealed compartments by the packaging shell, each compartment is filled with electrolyte, each compartment is provided with an opening, a positive lug column and a negative lug column which are spaced are arranged on the packaging shell, a positive lug of the battery cell at the head end in the plurality of battery cells connected in series is electrically connected with the positive lug column, and a negative lug of the battery cell at the tail end in series is electrically connected with the negative lug column. The negative tab of the battery cell at the tail end in the plurality of battery cells connected in series is electrically connected with the negative tab column; and each pressure balancer is connected with the corresponding opening. According to the lithium battery disclosed by the invention, the pressure balancer can discharge the generated gas out of the lithium battery, so that the swelling of the lithium battery is relieved, and the compactness of the structures of the positive plate and the negative plate of the lithium battery is prevented from being influenced.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, in particular to a lithium battery, a battery box and a vehicle. Background technique [0002] The voltage of a battery is determined by the potential difference between its positive and negative plates. The characteristic platform voltage of a lithium-ion battery is usually only a few volts, and higher voltages can only be provided by connecting multiple batteries in series. For example, in some large and medium-sized energy storage systems, several monomers are connected in series and parallel to form a module, and then several modules are connected in series to form a battery pack. The production of battery packs (or PACKs) in this way requires a large amount of consumables for electrical connection, fixing, insulation, heat conduction, etc. between cells, which increases the weight and volume of the battery system and reduces the energy density of the system. During the c...

AI Technical Summary

Problems solved by technology

The production of battery packs (or PACKs) in this way requires a large amount of consumables for electrical connection, fixing, insulation, heat conduction, etc. between cells, which increases the weight and volume of the battery system and reduces the energy density of the system.

During the charging process of the lithium battery, part of the electrolyte will undergo a reduction reaction on the surface of the negative plate and be decomposed to produce gas, which will cause the battery to swell. reduction of

At present, the maintainability of lithium batteries is poor. In addition to some application-side protection against overcharge, overdischarge, overload, and overtemperature, it is basically impossible to perform necessary maintenance interventions inside the battery, which makes the battery performance deteriorate faster, thus driving up application costs

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