CN219321383U - Integrated cell prelithiation device - Google Patents

Abstract

The utility model discloses an integrated cell prelithiation device. The integrated cell prelithiation device comprises: the lithium pre-processing box comprises a box body, a lug fixing element, a busbar, a liquid injection port, a liquid discharge port and an environment control port, wherein the lug fixing element is connected with the busbar; the lithium source half electrode and the negative electrode of the integrated battery core are clamped and fixed through the lug fixing element; and the positive electrode of the power supply is connected with the negative electrode of the integrated battery cell through the busbar, and the negative electrode of the power supply is connected with the lithium source half electrode. The device is simple and easy to operate, and can be used for batch prelithiation of integrated cells; compared with the traditional pre-lithiation device, the device adopts an electrochemical pre-lithiation method, has better consistency and uniformity of the pre-lithiation of the cathode, has low requirement on lithium sources, has low cost and is convenient for large-scale application and popularization.

Description

Integrated cell prelithiation device

Technical Field

The utility model relates to the technical field of battery manufacturing, in particular to an integrated battery core prelithiation device.

Background

Lithium batteries are widely used in the fields of aerospace, computers, mobile communication equipment, robots, electric automobiles and the like due to the advantages of high energy density, long cycle life and wide applicable temperature range. Along with the development of society and the progress of science and technology, the requirements on the energy density and the cycle life of a lithium battery are higher and higher, but the lithium ion battery which takes graphite simply as a negative electrode at present is difficult to meet the expectations of society, so that the development of novel positive and negative electrode materials with higher specific capacity is required. For the cathode material, the pre-lithiation work can effectively improve the specific energy of the battery and prolong the service life of the battery. Lithium metal has a high specific capacity (3860 mAh/g, 10 times that of graphite negative electrode) and a lowest redox potential (-3.04V VS standard hydrogen potential). The metal lithium is adopted to perform pre-lithiation treatment on the negative electrode of the traditional lithium ion battery, so that on one hand, the first coulomb efficiency of the battery can be improved, the specific energy of the battery can be increased, and on the other hand, the cycle life of the battery can be effectively prolonged, so that the lithium ion battery has wider application field.

Currently, there are mainly several methods of lithium powder prelithiation, lithium film prelithiation and electrochemical prelithiation. Pre-lithiation with lithium powder has some unavoidable drawbacks, such as: the lithium powder has the advantages of introduction of invalid components due to the addition of a passivation layer, difficult dispersion, high space occupation (the particle size is more than 40 mu m), extremely high cost and the like. However, the pre-lithiation of the lithium film is limited by the thickness of the lithium layer, and the lithium supplementing amount cannot be accurately controlled for different battery cells. The conventional electrochemical prelithiation only aims at a single pole piece to carry out prelithiation, has low efficiency, and cannot be suitable for batch prelithiation and large-scale application.

In view of the above, the utility model provides an integrated cell prelithiation device which can be used for batch prelithiation of integrated cells, and has better consistency and uniformity of anode prelithiation, higher efficiency and convenient large-scale application and popularization compared with the traditional prelithiation device.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provides a novel integrated cell prelithiation device which is simple and reliable to operate.

The aim of the utility model can be achieved by the following technical scheme.

An integrated cell prelithiation device, comprising: the lithium pre-treatment working box comprises a box body, a lug fixing element, a negative electrode busbar, a lithium source busbar and an environment control port; the negative electrode of the integrated battery cell is communicated with the negative electrode busbar after being fixed by the lug fixing element; the electrode lug of the lithium source half electrode is communicated with the lithium source busbar after being fixed by the electrode lug fixing element; and the anode of the power supply is connected with the anode of the integrated battery cell through an anode bus bar, and the anode of the power supply is connected with a lithium source half electrode through a lithium source bus bar.

The device is particularly suitable for the prelithiation of laminated battery cores and winding type rectangular battery cores, and can realize the prelithiation of a plurality of integrated battery cores at the same time, the number of the integrated battery cores depends on the size of the prelithiation work box, the prelithiation work box has low cost, and if the place of a battery manufacturer is enough, the prelithiation work box can be quite large.

Optionally, the pre-lithiation working chamber further comprises a liquid injection port, a liquid discharge port and a liquid level sensor for injecting and discharging electrolyte.

Optionally, the integrated cell prelithiation device further comprises an environmental control device for controlling the environmental atmosphere in the prelithiation process tank.

Optionally, the environment control device is a vacuumizing device or a gas replacement device, and provides a vacuum environment or an inert gas environment for the box body; the inert gas atmosphere is preferably an argon atmosphere.

Optionally, the integrated cell prelithiation device further comprises a liquid storage device, wherein the liquid storage device is used for providing electrolyte for the prelithiation working box.

Optionally, the integrated cell prelithiation device further comprises a control system for controlling at least one of a power supply voltage, a current, a prelithiation time, a prelithiation process tank liquid level, an environmental control device, and an environmental parameter within the prelithiation process tank.

Alternatively, the lithium source half-electrode is composed of metallic lithium and a current collector, and the metallic lithium is preferably 99% or more in purity.

Optionally, the pre-lithiation working box is a sealed box body with an openable or detachable surface.

Optionally, the tab fixing element is at least one of a clip, a claw, a clamping jaw, and a fixing plate.

Optionally, the tab fixing element is automatically controlled, and can be opened and closed under control of an electric signal after detecting that the integrated battery core is in place, so that the integrated battery core is released or clamped.

The technical scheme of the utility model has at least one of the following advantages:

1. the integrated battery cores can be prelithiated at the same time, so that the production efficiency is high and the cost is low;

2. the integrated battery core pre-lithiated by the device can be directly taken out and packaged into a battery after simple treatment, and the technical process is simple.

Drawings

Fig. 1 is a schematic diagram of an integrated cell prelithiation apparatus in accordance with the present utility model.

Fig. 2 is a schematic view of the prelithiation work box of fig. 1.

Description of the figure:

10 prelithiation working case 11, case 12 tab fixing element 13 pole

14 negative electrode busbar 15 lithium source busbar 16 liquid injection port 17 liquid discharge port

18 liquid level sensor 19 environmental control port 20 integrated cell 21 negative electrode tab

22 positive electrode tab 30 lithium source half electrode 40 power supply 41 power supply positive electrode

42 power supply negative electrode 50 environment control device 60 liquid storage device 61 liquid injection pump

70 control system 71 control screen

Detailed Description

The following describes specific embodiments of the present utility model. It is to be understood that other various embodiments can be devised and modifications to the embodiments by those skilled in the art based on the teachings of this disclosure without departing from the scope or spirit of this utility model. The following detailed description is, therefore, not to be taken in a limiting sense.

Fig. 1 shows a schematic diagram of an integrated cell prelithiation device according to an embodiment of the present utility model, and fig. 2 is a schematic diagram of an integrated cell prelithiation device in which a prelithiation work box is implemented.

Referring to fig. 1 and 2, the integrated cell prelithiation device includes:

an integrated cell 20, wherein the integrated cell 20 includes a negative electrode tab 21 and a positive electrode tab 22;

a lithium source half-electrode 30, the lithium source half-electrode 30 being composed of metallic lithium and a current collector;

a pre-lithiation work box 10, wherein the pre-lithiation work box 10 comprises a box body 11, a tab fixing element 12, a tab 13, a negative electrode busbar 14, a lithium source busbar 15, a liquid injection port 16, a liquid discharge port 17, a liquid level sensor 18 and an environment control port 19; the box 11 is a sealable box; the liquid injection port 16 is used for injecting electrolyte into the pre-lithiation working tank 10; the liquid outlet 17 is used for discharging the waste electrolyte from the tank body after the pre-lithiation is completed; the tab fixing elements 12 are plural, one part is used for fixing the tabs of the integrated battery cell 20, and the other part (at least one) is used for fixing the tabs of the lithium source half-electrode 30; the tab fixing element 12 for fixing the lithium source half electrode 30 is communicated with the lithium source bus bar 15 through the corresponding electrode post 13, and the tab fixing element 12 for fixing the negative electrode tab 21 on the integrated battery cell 20 is communicated with the negative electrode bus bar 14 through the corresponding electrode post 13;

a power supply 40 having a power supply positive electrode 41 and a power supply negative electrode 42; the positive electrode 41 of the power supply is communicated with the negative electrode bus bar 14 through a wire, and the negative electrode 42 of the power supply is communicated with the lithium source bus bar 15 through a wire;

environmental control device 50, in this embodiment, the environmental control device 50 is a vacuum device, and is connected to the environmental control port 19 on the pre-lithiated working tank 10, where the environmental control device 50 can place the pre-lithiated working tank 10 in a vacuum state, and preferably the vacuum degree is less than 100Pa; in other certain embodiments, the environmental control device 50 may also be a gas displacement device that maintains the pre-lithiated working chamber 10 in an inert gas environment by displacing the gas within the pre-lithiated working chamber 10;

the liquid storage device 60 is used for storing electrolyte, the liquid storage device 60 is connected with the liquid injection port 16 on the pre-lithiation working box 10 through the liquid injection pump 61, and the liquid injection pump 61 works to pump the electrolyte in the liquid storage device 60 into the pre-lithiation working box 10;

the control system 70, wherein the control system 70 is used for controlling relevant parameters of each link, the control system 70 further comprises a control screen 71, and relevant parameters to be controlled, the pre-lithiation time and the like can be input and set through the control screen 71.

When the lithium pre-forming working tank 10 is confirmed to be free of electrolyte during specific working (if the electrolyte exists, the electrolyte is firstly emptied through the liquid outlet 17), and the lithium pre-forming working tank 10 is opened first; fixing the current collector of the lithium source half electrode 30 to the tab fixing member 12 corresponding to the lithium source bus bar 15; sequentially fixing the negative electrode lugs 21 of the integrated battery cells 20 to be pre-lithiated on the lug fixing elements 12 corresponding to the negative electrode buses 14, so as to ensure that the heights of the negative electrode lugs 21 of the integrated battery cells 20 are relatively consistent; the pre-lithiation working chamber 10 is closed, the environment control device 50 maintains a set working environment in the pre-lithiation working chamber 10, and electrolyte is pumped into the pre-lithiation working chamber 10 by the liquid injection pump 61 until the set value is reached (typically, the electrolyte level reaches the position of the negative electrode tab 21 of the integrated cell 20). After the relevant prelithiation parameters are set on the control screen 71, the control system 70 controls the power supply 40 to start, and prelithiation of the multiple groups of integrated cells 20 is started. After the pre-lithiation is finished, discharging the electrolyte in the pre-lithiation working box 10 through the liquid outlet 17, opening the box body 11, taking out the integrated battery core 20 which is subjected to the pre-lithiation in the pre-lithiation working box 10, and assembling the battery after relevant process treatment.

Although the present utility model has been disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.

Claims (10)

1. An integrated cell prelithiation device, comprising:

the lithium pre-treatment working box comprises a box body, a lug fixing element, a negative electrode busbar, a lithium source busbar and an environment control port;

the negative electrode of the integrated battery cell is communicated with the negative electrode busbar after being fixed by the lug fixing element;

the electrode lug of the lithium source half electrode is communicated with the lithium source busbar after being fixed by the electrode lug fixing element;

and the anode of the power supply is connected with the anode of the integrated battery cell through an anode bus bar, and the anode of the power supply is connected with a lithium source half electrode through a lithium source bus bar.

2. The integrated cell prelithiation device of claim 1, wherein the prelithiation process tank further comprises a fill port, a drain port, and a level sensor.

3. The integrated-cell prelithiation device of claim 1, further comprising an environmental control means for controlling an environmental atmosphere within the prelithiation process chamber.

4. The integrated-cell prelithiation device of claim 3, wherein the environmental control device is a vacuum device or a gas displacement device that provides a vacuum environment or an inert gas environment to the housing.

5. The integrated cell prelithiation device of claim 1, further comprising a reservoir for providing electrolyte to the prelithiation process tank.

6. The integrated-cell prelithiation device of claim 1, further comprising a control system for controlling at least one of a supply voltage, a current, a prelithiation time, a prelithiation process tank level, an environmental control device, and an prelithiation process tank environmental parameter.

7. The integrated cell prelithiation device of claim 1, wherein the lithium source half electrode is comprised of metallic lithium and a current collector.

8. The integrated cell prelithiation device of claim 1, wherein the prelithiation process tank is a sealed tank that is openable and closable or removable on one side.

9. The integrated cell prelithiation device of claim 1, wherein the tab fixation element is at least one of a clip, a claw, a jaw, a fixation plate.

10. The integrated cell prelithiation device of claim 1, wherein the integrated cell comprises a laminated cell, a coiled rectangular cell.

Images