A quick-change needle bed for a power battery

Abstract

The invention discloses a fast-changing needle bed for a power battery, which includes a power mechanism, a positive mechanism and a negative mechanism. The power mechanism includes a first linear motion component connected to the positive mechanism, a second linear motion component connected to the negative mechanism, and A positive electrode probe and a negative electrode probe are respectively provided on the negative electrode mechanism and the first linear motion assembly and the second linear motion assembly drive the positive electrode mechanism and the negative electrode mechanism to move toward each other. Since the distance between the positive probe on the positive mechanism and the positive pole of the power battery and the negative pole of the negative probe on the negative mechanism are equal to the negative pole of the power battery, and the speeds of the first linear motion component and the second linear motion component are equal, It can ensure that the positive electrode probe and the negative electrode probe contact the positive and negative electrodes of the power battery at the same time, so that the contact pressure between the positive electrode and the negative electrode of the power battery is consistent, so as to avoid the gas generated during the formation process from being completely discharged, which will affect the contact between the positive and negative electrodes, and cause power failure. The phenomenon of "lithium analysis" in the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a fast-changing needle bed for a power battery. Background technique [0002] In the lithium battery production process, the assembled lithium battery is usually further activated through the process of "formation-OVC measurement-capacity separation", where "formation" refers to giving a certain current to the lithium battery to make the positive and negative electrodes of the battery active The electrochemical process in which the substance is excited and finally makes the battery discharge capable. When the lithium battery is formed, since the potential on the negative electrode side of the lithium battery is zero, the solvent used in the electrolyte will undergo reduction and decomposition on the surface of the negative electrode to generate gas. ; "OVC measurement" refers to the measurement of the open circuit voltage of the lithium battery, that is, the...

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Problems solved by technology

[0003] In the existing related technology, the positive electrode probe and the negative electrode probe used in the chemical formation process are usually separately contacted with the lithium battery. Usually, the lithium battery first contacts the negative electrode probe, and then moves the positive electrode probe to the lithium battery. Charging, but because the positive electrode probe and the negative electrode probe do not contact the lithium battery synchronously, the contact pressure between the positive electrode and the negative electrode of the lithium battery is inconsistent. Because the formation charging is often accompanied by large current and high charging SOC (State of Charge, SOC for short, Refers to the available state of the remaining charge in the battery), so the rate of gas generation during the formation is faster. When the contact pressure between the positive electrode and the negative electrode of the lithium battery is inconsistent, the generated gas cannot be completely discharged and affects the contact between the positive and negative electrodes. It is easy to cause lithium The phenomenon of battery "lithium separation", lithium separation can easily cause the performance of lithium batteries to decline, the cycle life is greatly shortened, and it also limits the fast charging capacity of lithium batteries, and may even cause lithium batteries to burn, explode, etc.

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