CN105553034A - Lithium battery charging system capable of adjusting battery performance consistency at same batch - Google Patents

Abstract

The invention relates to a lithium battery charging system capable of adjusting the performance of batteries of the same batch to be consistent, and belongs to the technical field of battery cell manufacturing. The system includes two parallel and spaced conveying rollers for conveying battery core groups, a first charging mechanism and a second charging mechanism that are successively straddled on the conveying rollers; the first and second charging mechanisms both contain The frame on the conveying roller table, the probe installed on the top of the frame, the lifting assembly arranged under the frame and corresponding to the position of the probe; the lifting assembly is located between the two conveying roller tables; one end of the lifting assembly is set There is a stopper, when the battery pack is blocked by the stopper and lifted by the lifting component, the probes and the tabs of the battery pack are pressed one by one, and the probes on the first charging mechanism are connected in series and then Connect one charger in series; connect the second probe in parallel, and connect another charger in parallel. The invention allows the battery pack to automatically fill up the under-full voltage to ensure the consistency of product parameters.

Description

Lithium battery charging system that can adjust the battery performance of the same batch

technical field

The invention relates to a lithium battery charging system, which belongs to the technical field of battery cell manufacturing.

Background technique

Currently, in the production process of lithium-ion batteries as a new energy source, the battery formation process is indispensable. The battery formation process can improve the comprehensive performance of the battery, such as charge and discharge performance and self-discharge, and has a significant impact on the finished product pass rate and performance of the factory battery. Due to the differences in parameter values in terms of voltage, internal resistance, capacity, etc. between batteries of the same type, same specification, and the same model, that is, there are inconsistencies in battery performance. This makes the performance index of the power lithium battery pack often not reach the original level of the single battery when it is used, and the service life is shortened several times or even ten times, which seriously affects its application in production and life. The charging process in the battery formation process has an important impact on the consistency of battery performance. Therefore, changing the existing lithium battery charging method to improve the consistency of the power lithium battery pack will contribute to the service life of the power lithium battery pack and enable it to exert its maximum performance.

According to the applicant's knowledge, most of the existing domestic enterprises use the charging method of single cells, and the consistency of the batteries obtained is poor.

Contents of the invention

The technical problem solved by the invention is to propose a battery charging system and its working method which can adjust the performance of batteries of the same batch to be consistent.

In order to solve the above technical problems, the technical solution proposed by the present invention is: the system includes two parallel and spaced conveying rollers for conveying battery packs, the first charging mechanism and the Two charging mechanisms; the first and second charging mechanisms all contain a frame straddling the conveying roller table, a probe mounted on the top of the frame, arranged below the frame and connected to the probe The lifting assembly corresponding to the position of the needle assembly; the lifting assembly is located between the two conveying rollers; one end of the lifting assembly is provided with a stopper, when the battery pack is blocked by the stopper and When being lifted by the lifting component, the probes are pressed against the tabs of the cell pack one by one, the probes on the first charging mechanism are connected in series, and then a series charger is connected ; The probes on the second charging mechanism are connected in parallel, and then a parallel charger is connected.

The further improvement of the present invention is that: the probe is installed on the output end of the cylinder, and the cylinder is installed on the top of the frame; the working method includes: when the lifting assembly lifts the battery pack, The probe presses the tab tightly under the push of the air cylinder.

A further improvement of the present invention is that: the cylinder, the lifting assembly, the stopper, the series charger and the parallel charger are all controlled by a host computer.

The further improvement of the present invention is that: the system also includes a tooling box for clamping the electric core, the tooling box is surrounded by two opposite side panels and two opposite end panels, and the tooling box also has a Bottom plate, 10 battery cells can be loaded into the tooling box and clamped.

The beneficial effects brought by the invention are: adopting the charging method provided by the invention can make the battery pack automatically fill up the sub-full voltage and ensure the consistency of product parameters. The implementation system is simple in structure, fast and stable in charging and fully automatic.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

The labels in the figure are as follows: 1 series charging mechanism, 2 parallel charging mechanism, 3 conveying roller table, 1-1 frame, 1-2 probe assembly, 1-3 probe, 1-4 cylinder, 1-5 stopper , 1-6 battery pack, 1-7 lifting components.

detailed description

Example

The lithium battery charging system of this embodiment includes two parallel and spaced conveying rollers 3 for conveying battery cells, and there are two charging mechanisms in sequence on the conveying rollers 3: a series charging mechanism 1 and a parallel charging mechanism 2 Both the series charging mechanism 1 and the parallel charging mechanism 2 include: a frame 1-1 straddling the conveying roller table 3, a probe assembly 1-2 installed on the top of the frame 1-1, and a probe assembly 1-2 arranged on the frame 1- Lifting assembly 1-7 below 1 and corresponding to the position of probe assembly 1-2; the gap between the two conveyor rollers 3 can accommodate lifting assembly 1-7; probe assembly 1-2 includes probe 1-3 and the cylinder 1-4 that drives the probe 1-3 to reciprocate vertically; one end of the lifting assembly 1-7 is provided with a stopper 1-5, which stops when the battery pack 1-6 is blocked by the stopper 1-5 On the lifting component 1-2, and the position can make the probes 1-3 correspond to the tabs of the battery cells one by one. After the lifting component 1-7 lifts the battery pack 1-6, the probes 1-3 3 Press the tabs under the push of the cylinder 1-4; the probes on the series charging mechanism 1 are connected in series, and then a series charger is connected; the probes on the parallel charging mechanism 2 are connected in parallel, and then a parallel charger is connected. charger.

In this embodiment, the probe assembly 1-2, the lifting assembly 1-7, the stopper 1-5, the series charger and the parallel charger are all controlled by a host computer, thereby realizing automatic control.

This embodiment also includes a tooling box for clamping the electric core. The tooling box is surrounded by two opposite side panels and two opposite end panels. The tooling box also has a bottom plate. Core and clamp.

The specific charging method of the above system includes the following steps:

(a) Clamp 10 batteries with tooling;

(b) Put 12 groups of clamped cell groups on the conveying roller table 3;

(c) When the battery pack 1-6 reaches the top of the lifting assembly 1-7 of the series charging mechanism 1, the host computer drives the stopper 1-5, and the stopper 1-5 stretches out, and the battery pack 1-6 Block above the lifting assembly 1-7, and then the upper computer drives the lifting assembly 1-7 to lift the cell pack 1-6 away from the conveying roller table 3, preventing the pressure of the probe from damaging the conveying roller table 3, and at the same time the upper position The machine drives the probe assembly 1-2 to press down, so that the probe 1-3 presses the tab of the battery cell;

(d) The host computer drives the series charger to start charging the battery pack 1-6 with a constant current;

(e) When the voltage of any cell in the cell group 1-6 reaches 3.75V, or when the overall voltage reaches 428 to 438V, switch to constant voltage charging, the charging voltage is 428 to 438V, and the cut-off current is 1A;

(f) After the previous step is completed, the upper computer first disconnects the series charger, then drives the probe assembly 1-2 to lift back to its position, the lifting mechanism 1-7 drops back to its position, the stopper 1-5 drops back to its position, and the battery pack 1-6 returns to the conveying roller table 3 again and is sent to the parallel charging mechanism;

(g) When the battery pack 1-6 reaches the top of the lifting assembly 1-7 of the parallel charging mechanism 2, the host computer drives the stopper 1-5, and the stopper 1-5 stretches out, and the battery pack 1-6 Block above the lifting assembly 1-7, then the host computer drives the lifting assembly 1-7 to lift the cell pack 1-6 away from the conveying roller table 3, and at the same time the host computer drives the probe assembly 1-2 to press down, so that the probe Needle 1-3 presses the tabs of the battery cell; then stand still for about 20 minutes, let the battery pack 1-6 perform the first no-load self-charging;

(h) The host computer starts the parallel charger, and applies a current of 20A to the battery pack 1-6 for constant current charging;

(i) When the voltage of any cell in the cell group 1-6 in the previous step reaches 3.75V; switch to constant voltage charging, the charging voltage is 3.75V, and the cut-off current is 1A;

(j) After the above steps are completed, the host computer is disconnected and connected to the charger in parallel, so that the batteries 1-6 can be self-charged. When the current on the connection line between the batteries is 0, the charging is completed.

(k) After the above steps are completed, the host computer is disconnected and connected to the charger in parallel to allow the battery pack 1-6 to self-charge. When the current on the connection line between the batteries is 0, the charging is completed.

(l) After the above steps are completed, the upper computer drives the probe assembly 1-2 to lift back to its position, the lifting mechanism 1-7 drops back to its position, the stopper 1-5 drops back to its position, and the battery pack 1-6 returns to the conveying position again On the roller table 3, it is sent to the follow-up station.

In this embodiment, a clamping tool box with 10 batteries is used. In order to simplify the operation, at least 10 batteries are charged at a time. At the same time, because the same batch of battery cells adopting the charging method of the present invention has very good consistency, each group of battery cells should include as many battery cells as possible. However, considering the manufacturing cost of the mechanical structure itself and the power of the charger, generally choose 150 or less. The grouping mode of 120 pieces adopted in this implementation makes the cost of mechanical manufacturing lower, the power of the charger is also lower, and reduces potential safety hazards and maintenance costs.

The present invention is not limited to the specific technical solutions described in the above embodiments, and all technical solutions formed by equivalent replacement are within the scope of protection required by the present invention.

Claims (1)

1. a method of work for lithium battery charging system, is characterized in that, this system comprises for carrying the rollgang of battery core group, front and back to be located at the first charging mechanism on described rollgang and the second charging mechanism successively; Described first and second charging mechanisms all containing the frame be located on described rollgang, be installed on described frame top probe, be arranged at lift assemblies below described frame and corresponding with described probe location; One end of described lift assemblies is provided with stopper, when described battery core group to be stopped by described stopper and by described lift assemblies lifting time, the lug one_to_one corresponding of described probe and described battery core group compresses, and connects a serial connection charge device after the probe on described first charging mechanism connects in a series arrangement again; Probe on described second charging mechanism connects with parallel way, then connects a parallel charger;

Described method of work comprises the steps:

A 10 battery cores clamp with frock by ();

B battery core group after 12 groups of clampings is put rollgang by ();

C () is when battery core group arrives the top of the lift assemblies of serial connection charge mechanism, host computer drives stopper, stopper stretches out, battery core group is blocked in above lift assemblies, then host computer drives lift assemblies that battery core group is lifted disengaging rollgang, the pressure damage rollgang preventing probe from pressing down, host computer drives probe assembly to press down simultaneously, makes probe compress the lug of battery core;

D () host computer drives serial connection charge device to start to carry out constant current charge to battery core group;

E () when the voltage of battery core arbitrary in battery core group reaches 3.75V, or when global voltage reaches 428-438V, switches to constant voltage charge, charging voltage 428-438V, cut-off current is 1A;

F () upper step completes after, host computer is open circuit serial connection charge device first, and then drive probe assembly to promote return, lifting mechanism decline return, stopper decline return, battery core group is got back on rollgang again, is sent to place of charged in parallel mechanism;

G () is when battery core group arrives the top of the lift assemblies of charged in parallel mechanism, host computer drives stopper, stopper stretches out, battery core group is blocked in above lift assemblies, then host computer drives lift assemblies that battery core group is lifted disengaging rollgang, host computer drives probe assembly to press down simultaneously, makes probe compress the lug of battery core; Then static 20 minutes, battery core group is allowed to carry out first time non-loaded self-charging;

H () host computer starts parallel charger, carry out constant current charge to the electric current of battery core group in addition 20A;

(i) when in the battery core group in upper step, the voltage of arbitrary battery core reaches 3.75V; Switch to constant voltage charge, charging voltage is 3.75V, and cut-off current is 1A;

J () completes step after, host computer open circuit parallel charger, allows battery core group carry out self-charging, when electric current is 0 on the connection line when between battery core, namely completes charging.