CN206558637U

CN206558637U - A kind of lithium ion battery self discharge screening plant

Info

Publication number: CN206558637U
Application number: CN201720285884.9U
Authority: CN
Inventors: 梁煜潮; 肖超善; 吴瑕
Original assignee: Huaihua Shunda New Energy Automobile Technology Co Ltd
Current assignee: Huaihua Shunda New Energy Automobile Technology Co Ltd
Priority date: 2017-03-16
Filing date: 2017-03-16
Publication date: 2017-10-13
Anticipated expiration: 2027-03-16

Abstract

The utility model discloses a kind of lithium ion battery self discharge screening plant in self discharge triage techniques field, including balanced power supply, the positive pole of the balanced power supply is serially connected with equalizer switch by wire, the control end of the equalizer switch is uniform and be connected to a bit switch by wire, utilize the conductive and preferable mechanical strength of graphite ene coatings, improve circuit stability, switch contact is avoided to wear and tear and cause loose contact, electric voltage equalization is carried out before battery core high temperature ageing self discharge to be checked test, it is consistent the voltage before each battery core high temperature ageing to be checked, by K=(OCV₂‑OCV₁In)/T formula, voltage OCV before high temperature ageing₁Consistent numerical value is converted into, T is constant, only OCV₂For variable, you can with according to OCV₂Value judges the size of self discharge K values, and this method only need to examine once battery core voltage to be checked after self discharge test, greatly reduce detection operation amount and detection device cost, and error reduces.

Description

A kind of lithium ion battery self discharge screening plant

Technical field

The utility model is related to self discharge triage techniques field, specially a kind of lithium ion battery self discharge screening plant.

Background technology

Judge that the major parameter of the consistent sex differernce of battery core has capacity, voltage, internal resistance and self-discharge rate etc. at present, these parameters In be easier it is obtaining, relatively accurate be voltage and internal resistance measure, and internal resistance is due to instrument and the difference of testing staff, Its value can only make reference within the specific limits, so most producers are put in storage when self discharge is screened after mainly being produced by battery core A period of time is shelved, open-circuit voltage is tested before secondary partial volume Over-The-Counter with preliminary screening self discharge, and combine the number of secondary partial volume Electric discharge is selected from according to finishing screen, it is very long so to do the one side cycle, battery core is often had one month from producing to last shipment More than cycle, the occupancy to producer's fund and warehouse is larger, on the other hand, using secondary partial volume, even three times partial volumes this Also very big to artificial and equipment waste during the mode of kind, cell and former battery core can go out when no circumscribing discharge loop Existing terminal voltage reduction, the phenomenon of available power loss, referred to as self discharge.Due to the influence of raw material and manufacturing process, a small amount of lithium The self-discharge rate of ion battery core can reach several times of normal battery core, and these battery cores are used with other battery core connection in series-parallel, can serious shadow Ring the performance of whole group battery core, it is necessary to which the excessive battery core of self-discharge rate is picked out into degradation processing, it is contemplated that testing cost and Safety is general in actual batch production at present to detect battery core self-discharge performance, conventional detection side using detection voltage change Method is that battery core is discharged to after protection voltage, is put into hot environment and shelves 5-15 days, battery core is characterized by detecting battery core pressure drop Self discharge level.At present, lithium-ion electric core factory mainly has two kinds using the method for screening self discharge, first, high by detecting Voltage is designated as OCV before the voltage of each single battery core before and after warm aging, high temperature ageing₁, voltage is designated as OCV after high temperature ageing₂, it is high Warm ageing time is designated as T, assesses K values=(OCV of battery core self discharge size₂-OCV₁)/T, this method needs to compile battery core Number, before and after high temperature ageing by-all battery cores of detection voltage altogether twice, equipment cost and cost of labor input are big；Second, part Manufacturer directly omit battery core is encoded and high temperature ageing before voltage detecting, with the voltage OCV after high temperature ageing₂As certainly Voltage OCV after the basis for estimation of discharge magnitude, such as 45 DEG C of LiFePO4 battery core high temperature ten days₂It is determined as low pressure, OCV less than 2.8V₂ It is qualified to be determined as more than or equal to 2.8V, K values=(OCV₂-OCV₁There is OCV in)/T₁And OCV₂Two variables, this method ignores OCV₁ Influence, there is larger error, therefore, I proposes a kind of lithium ion battery self discharge screening plant.

Utility model content

The purpose of this utility model is to provide a kind of lithium ion battery self discharge screening plant, to solve above-mentioned background skill The existing detection method error proposed in art is big, the problem of process is cumbersome.

To achieve the above object, the utility model provides following technical scheme：A kind of lithium ion battery self discharge screening dress Put, including balanced power supply, the positive pole of the balanced power supply is serially connected with equalizer switch, the control end of the equalizer switch by wire Uniform and be connected to a bit switch by wire, the not moved end of described bit switch is serially connected with battery core to be checked, the battery core to be checked Negative pole is connected by wire with the negative pole of balanced power supply.

It is preferred that, the balanced power supply includes constant current charger and voltage-stabilized power supply.

It is preferred that, the contact surface of the equalizer switch and point bit switch is provided with graphite ene coatings.

Compared with prior art, the beneficial effects of the utility model are：Constant current charger is included and steady by balanced power supply Voltage source, allows balanced power supply to provide small multiplying power electric current and carries out filling for battery core to be checked from constant current charger and voltage-stabilized power supply Electricity, graphite ene coatings are provided with by the contact surface of equalizer switch and point bit switch, using the conductive of graphite ene coatings and preferably Mechanical strength, improve circuit stability, it is to avoid switch contact wear and tear and cause loose contact, in battery core high temperature ageing to be checked Electric voltage equalization is carried out before self discharge test, is consistent the voltage before each battery core high temperature ageing to be checked, by K=(OCV₂- OCV₁In)/T formula, voltage OCV before high temperature ageing₁Consistent numerical value is converted into, T is constant, only OCV₂For variable, you can with root According to OCV₂Value judges the size of self discharge K values, and this method only need to examine once battery core voltage to be checked after self discharge test, Detection operation amount and detection device cost are greatly reduced, error reduces.

Brief description of the drawings

Fig. 1 is the utility model circuit diagram.

In figure：1 balanced power supply, 2 equalizer switches, 3 bit switches, 4 battery cores to be checked.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belongs to the scope of the utility model protection.

Referring to Fig. 1, the utility model provides a kind of technical scheme：A kind of lithium ion battery self discharge screening plant, bag Balanced power supply 1 is included, the positive pole of the balanced power supply 1 is serially connected with equalizer switch 2, the control end of the equalizer switch 2 by wire Uniform and be connected to a bit switch 3 by wire, the not moved end of described bit switch 3 is serially connected with battery core 4 to be checked, the battery core to be checked 4 negative pole is connected by wire with the negative pole of balanced power supply 1.

Wherein, the balanced power supply 1 includes constant current charger and voltage-stabilized power supply, is made from constant current charger and voltage-stabilized power supply Balanced power supply 1 can provide the contact of the charging that small multiplying power electric current carries out battery core 4 to be checked, the equalizer switch 2 and point bit switch 3 Surface is provided with graphite ene coatings, using the conductive and preferable mechanical strength of graphite ene coatings, improves circuit stability, it is to avoid Switch contact weares and teares and causes loose contact.

Operation principle：Using existing discharge and recharge detecting box carrier, only increase balanced a power supply 1 and equalizer switch 2, After the electric discharge of battery core partial volume terminates, electric voltage equalization work step is entered, balanced electricity is parallel-connected to using the point bit switch 3 on detecting box On source 1, and controlled by an equalizer switch 2, balanced power supply 1 negative pole and point bit switch 3 between and receive inspection battery core 4, about After each electric voltage equalization of battery core 4 to be checked is consistent after ten minutes, you can lower cabinet is transferred to hot environment and carries out self discharge test, shelves one (general 5 days to 15 days) the detection voltage OCV of battery core 4 to be checked after the section time₂, due to by each battery core 4 to be checked of charged in parallel event OCV₁Equally, while T is constant, you can know K=(OCV₂-OCV₁)/T self discharge decision content.

While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, It is appreciated that these embodiments can be carried out in the case where not departing from principle of the present utility model and spirit a variety of changes, repaiies Change, replace and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.

Claims

1. a kind of lithium ion battery self discharge screening plant, including balanced power supply (1), it is characterised in that：The balanced power supply (1) Positive pole equalizer switch (2) is serially connected with by wire, the control end of the equalizer switch (2) is uniform and be connected to a position by wire Switch (3), the not moved end of described bit switch (3) is serially connected with battery core to be checked (4), and the negative pole of the battery core (4) to be checked is by leading Line is connected with the negative pole of balanced power supply (1).

2. a kind of lithium ion battery self discharge screening plant according to claim 1, it is characterised in that：The balanced power supply (1) constant current charger and voltage-stabilized power supply are included.

3. a kind of lithium ion battery self discharge screening plant according to claim 1, it is characterised in that：The equalizer switch (2) and point bit switch (3) contact surface be provided with graphite ene coatings.