CN219419088U - Electrode lithium supplementing device and battery production system - Google Patents
Electrode lithium supplementing device and battery production system Download PDFInfo
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- CN219419088U CN219419088U CN202320385698.8U CN202320385698U CN219419088U CN 219419088 U CN219419088 U CN 219419088U CN 202320385698 U CN202320385698 U CN 202320385698U CN 219419088 U CN219419088 U CN 219419088U
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Abstract
The utility model provides an electrode lithium supplementing device and a battery production system, and relates to the technical field of batteries. The electrode lithium supplementing device comprises a rolling mechanism, a pole piece conveying mechanism, a lithium film conveying mechanism and a heat insulation film unreeling mechanism; the rolling mechanism comprises two compression rollers which are oppositely arranged, and a lithium supplementing gap is reserved between the two compression rollers; the pole piece conveying mechanism is used for driving the pole piece to pass through the lithium supplementing gap; the lithium film conveying mechanism is used for driving the lithium film to pass through the lithium supplementing gap, and the sum of the thicknesses of the pole piece and the lithium film is larger than the width of the lithium supplementing gap; the heat-insulating film unreeling mechanism is arranged at the reeling end of the pole piece conveying mechanism and is used for guiding in the heat-insulating film so that the heat-insulating film and the lithium supplementing electrode are covered. The utility model can solve the problems of poor controllability of the reaction rate and potential safety hazard caused by reaction heat generation in the anode pre-lithiation technology, can effectively control the lithiation reaction rate of metal lithium and an electrode, and eliminates the damage problem in the electrode lithium supplementing process and the potential safety hazard caused by the lithiation reaction heat generation.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to an electrode lithium supplementing device and a battery production system.
Background
Along with popularization of consumer electronic products, development of the field of power batteries and iteration of power grid energy storage, people put higher requirements on the energy density and cycle life of lithium ion batteries, and application of high-capacity alloy type cathodes is an important direction for improving the energy density of batteries. However, the formation of a solid electrolyte film (SEI film) on the surface of a negative electrode and the occurrence of side reactions in a lithium ion battery during the first-cycle charging process cause irreversible consumption of active lithium in the battery, and the pre-lithiation technology is widely considered as an effective scheme for compensating for the loss of active lithium in the electrode to improve the energy density and cycle life of the battery.
Currently, the anode prelithiation technology is to press metal lithium onto the surface of the anode by means of a rolling process for lithium supplementation. However, the reaction rate is high and a large amount of heat is generated in the process of pressing and supplementing lithium between the metal lithium and the alloy type negative electrode, the controllability of the lithiation reaction rate is poor finally, the electrode surface is blackened and other damage problems are caused by the rapid lithiation reaction, and certain potential safety hazards exist in the lithium supplementing production process.
Disclosure of Invention
The utility model aims to overcome the defects of poor reaction rate controllability and potential safety hazard caused by reaction heat production in the anode pre-lithiation technology in the prior art, thereby providing an electrode lithium supplementing device and a battery production system.
In order to solve the problems, the utility model provides an electrode lithium supplementing device, which comprises a rolling mechanism, a pole piece conveying mechanism, a lithium film conveying mechanism and a heat insulation film unreeling mechanism; the rolling mechanism comprises two compression rollers which are oppositely arranged, and a lithium supplementing gap is reserved between the two compression rollers; the pole piece conveying mechanism is used for driving the pole piece to be subjected to lithium supplement to pass through the lithium supplement gap; the lithium film conveying mechanism is used for driving the lithium film to pass through the lithium supplementing gap, and the sum of the thicknesses of the pole piece and the lithium film is larger than the width of the lithium supplementing gap; the heat-insulating film unreeling mechanism is arranged at the reeling end of the pole piece conveying mechanism and is used for guiding in the heat-insulating film so that the heat-insulating film and the lithium supplementing electrode are covered.
Optionally, the lithium ion battery comprises a heat insulation film guiding mechanism, wherein the heat insulation film guiding mechanism is used for guiding out the heat insulation film so as to separate the heat insulation film from the lithium ion battery electrode.
Optionally, the heat-insulating film guiding mechanism comprises a first roller for unreeling the lithium-supplementing electrode pole roll covered with the heat-insulating film, a second roller for reeling the lithium-supplementing electrode and a third roller for reeling the heat-insulating film.
Optionally, the pole piece conveying mechanism comprises a pole piece unreeling roller and a pole piece reeling roller which are arranged in parallel with the press roller, and the pole piece unreeling roller and the pole piece reeling roller are respectively arranged at two sides of the rolling mechanism.
Optionally, the electrode lithium supplementing device is provided with a heat insulation film guiding-out stage, in the heat insulation film guiding-out stage, the first roller is a pole piece unreeling roller, the second roller is a pole piece winding roller, and the two compression rollers are movably arranged so that a lithium supplementing gap is adjustable.
Optionally, a third roller is disposed between the lithium film conveying mechanism and the pole piece conveying mechanism.
Optionally, the lithium film conveying mechanism comprises a lithium film unreeling roller and a lithium film reeling roller which are arranged in parallel with the press roller, and the lithium film unreeling roller and the lithium film reeling roller are respectively arranged at two sides of the rolling mechanism.
Optionally, the lithium film conveying mechanism is provided with a group; or the lithium film conveying mechanisms are provided with two groups, the two groups of lithium film conveying mechanisms are respectively arranged on two sides of the pole piece, and the sum of the thicknesses of the pole piece and the two lithium films is larger than the width of the lithium supplementing gap.
Optionally, the heat-insulating film unreeling mechanism comprises a heat-insulating film unreeling roller which is arranged in parallel with the press roller, and the heat-insulating film unreeling roller is arranged between the pole piece conveying mechanism and the lithium film conveying mechanism.
Optionally, the pole piece comprises a current collector and an electrode dressing arranged on the surface of the current collector.
Optionally, the lithium film comprises a base film and a metal lithium layer arranged on the base film, and the metal lithium layer and the electrode dressing of the pole piece are oppositely arranged.
In another aspect, the utility model provides a battery production system, which comprises the electrode lithium supplementing device according to any one of the technical schemes.
The utility model has the following advantages:
1. according to the technical scheme, the pole piece is conveyed through the pole piece conveying mechanism, so that the pole piece passes through a lithium supplementing gap between the two compression rollers, meanwhile, the lithium film is conveyed through the lithium film conveying mechanism, so that the lithium film passes through the lithium supplementing gap, and as the sum of the thicknesses of the pole piece and the lithium film is larger than the width of the lithium supplementing gap, under the pressure action of the compression rollers, metal lithium in the lithium film is stripped and covered on the pole piece, and a lithium supplementing electrode is obtained; due to the fact that the heat-insulating film unreeling mechanism is arranged, the heat-insulating film unreeling mechanism is arranged at the reeling end of the pole piece conveying mechanism, the heat-insulating film unreeling mechanism can unreel the heat-insulating film, and under the reeling effect of the pole piece conveying mechanism, the heat-insulating film and the lithium-supplementing electrode are rolled simultaneously, and the lithium-supplementing electrode coil covered with the heat-insulating film is obtained. Through in the winding process of the lithium supplementing electrode, the heat insulation film is arranged on the surface of the lithium supplementing electrode and wound into the electrode roll, and under the normal temperature condition, the lithium metal in the electrode roll and the surface of the electrode undergo lithiation reaction, the heat insulation film absorbs the superfluous heat released in the lithiation reaction process, the lithiation reaction rate of the lithium metal and the electrode is effectively controlled, and the damage problem in the lithium supplementing process of the electrode and the potential safety hazard problem caused by heat generation of the lithiation reaction are eliminated.
2. Through setting up thermal-insulated membrane derivation mechanism, place the moisturizing lithium electrode pole book that covers the thermal-insulated membrane on first roller, unreel by first roller, with moisturizing lithium electrode and thermal-insulated membrane separation, wherein moisturizing lithium electrode passes through the second roller rolling, and the thermal-insulated membrane passes through the third roller rolling, has realized that the moisturizing lithium electrode pole book that covers the thermal-insulated membrane is rewound to export the thermal-insulated membrane in the rewinding process, thereby obtain moisturizing lithium electrode pole book.
3. In the heat-insulating film export stage, the pole piece unreeling roller is used as a first roller, and the pole piece reeling roller is used as a second roller, so that the structure is simplified, the compactness of the structure is improved, and the occupied space is reduced.
4. The lithium film conveying mechanisms are arranged in two groups, and the two groups of lithium film conveying mechanisms are respectively arranged on two sides of the pole piece and can supplement lithium to the two sides of the pole piece.
5. The third roller is arranged between the lithium film conveying mechanism and the pole piece conveying mechanism, and the heat insulation film unreeling roller is arranged between the pole piece conveying mechanism and the lithium film conveying mechanism, so that the structure of the electrode lithium supplementing device is compact, and the occupied space is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of an electrode lithium supplementing device in a lithium supplementing stage;
fig. 2 shows a schematic structural diagram of the electrode lithium supplementing device provided by the utility model in a heat insulation film export stage;
fig. 3 shows a schematic structure of a lithium film in the electrode lithium supplementing device provided by the utility model;
fig. 4 is a cross-sectional view showing a lithium-compensating electrode structure obtained after a heat-insulating film is introduced by using the electrode lithium-compensating device provided by the embodiment of the utility model;
fig. 5 shows a process flow chart of lithium supplementing an electrode by using the electrode lithium supplementing device provided by the embodiment of the utility model.
Reference numerals illustrate:
1. a rolling mechanism; 11. a press roller; 2. a pole piece conveying mechanism; 21. a pole piece unreeling roller; 22. a pole piece wind-up roll; 3. a lithium film delivery mechanism; 31. a lithium film unreeling roller; 32. lithium film wind-up roll; 4. a heat insulation film unreeling mechanism; 41. an unreeling roller of the heat insulation film; 5. a heat insulating film guiding mechanism; 51. a first roller; 52. a second roller; 53. a third roller; l, lithium film; l1, a base film; l2, a metallic lithium layer; E. a pole piece; e1, a current collector; e2, electrode dressing; s, a heat insulation film.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
For the purpose of illustrating the concepts of the utility model, the drawings and detailed description are to be regarded as illustrative in nature and not as restrictive.
Example 1
An electrode lithium supplementing device, referring to fig. 1, comprises a rolling mechanism 1, a pole piece conveying mechanism 2, a lithium film conveying mechanism 3 and a heat insulation film unreeling mechanism 4; the rolling mechanism 1 comprises two compression rollers 11 which are oppositely arranged, and a lithium supplementing gap is reserved between the two compression rollers 11; the pole piece conveying mechanism 2 is used for driving a pole piece E to be subjected to lithium supplement to pass through the lithium supplement gap; the lithium film conveying mechanism 3 is used for driving the lithium film L to pass through the lithium supplementing gap, and the sum of the thicknesses of the pole piece E and the lithium film L is larger than the width of the lithium supplementing gap; the heat-insulating film unreeling mechanism 4 is arranged at the reeling end of the pole piece conveying mechanism 2 and is used for guiding the heat-insulating film S in, so that the heat-insulating film S and the lithium supplementing electrode are covered.
According to the technical scheme, the pole piece E is conveyed through the pole piece conveying mechanism 2, so that the pole piece E passes through a lithium supplementing gap between the two press rolls 11, meanwhile, the lithium film L is conveyed through the lithium film conveying mechanism 3, so that the lithium film L passes through the lithium supplementing gap, and as the sum of the thicknesses of the pole piece E and the lithium film L is larger than the width of the lithium supplementing gap, under the pressure of the press rolls 11, metal lithium in the lithium film L is stripped and covered on the pole piece E, and a lithium supplementing electrode is obtained; due to the arrangement of the heat-insulating film unreeling mechanism 4, and the heat-insulating film unreeling mechanism 4 is arranged at the reeling end of the pole piece conveying mechanism 2, the heat-insulating film unreeling mechanism 4 can unreel the heat-insulating film S, and under the reeling effect of the pole piece conveying mechanism 2, the heat-insulating film S and the lithium-supplementing electrode are simultaneously reeled to obtain the lithium-supplementing electrode covered with the heat-insulating film S, as shown in fig. 4. Through placing the heat insulation film S on the surface of the lithium supplementing electrode in the winding process of the lithium supplementing electrode and winding the heat insulation film S into the electrode roll, under the normal temperature condition, the metal lithium in the electrode roll and the surface of the electrode undergo lithiation reaction, and the heat insulation film S absorbs the superfluous heat released in the lithiation reaction process, so that the lithiation reaction rate of the metal lithium and the electrode is effectively controlled, and the damage problem in the lithium supplementing process of the electrode and the potential safety hazard problem caused by heat generation of the lithiation reaction are eliminated.
Alternatively, referring to fig. 2, the electrode lithium supplementing device includes a heat insulating film guiding mechanism 5, and the heat insulating film guiding mechanism 5 is used for guiding out the heat insulating film S, so that the heat insulating film S and the lithium supplementing electrode are separated.
The heat-insulating film discharging mechanism 5 includes a first roller 51 for unreeling the lithium-compensating electrode roll covered with the heat-insulating film S, a second roller 52 for reeling the lithium-compensating electrode, and a third roller 53 for reeling the heat-insulating film S.
Specifically, the first roller 51 unwinds, the third roller 53 winds the heat-insulating film S, separates and guides the heat-insulating film S from the lithium-compensating electrode, and the third roller 53 reversely winds the lithium-compensating electrode, i.e., winds down, thereby obtaining a lithium-compensating electrode roll. By providing the heat insulating film lead-out mechanism 5, the efficiency of lead-out of the heat insulating film S can be improved, and the working efficiency of lithium supplementing of the electrode can be improved.
Optionally, the pole piece conveying mechanism 2 comprises a pole piece unreeling roller 21 and a pole piece reeling roller 22 which are arranged in parallel with the press roller 11, and the pole piece unreeling roller 21 and the pole piece reeling roller 22 are respectively arranged at two sides of the press mechanism 1. Specifically, the pole piece unreeling roller 21, the pole piece reeling roller 22 and the compression roller 11 are arranged in parallel. The electrode pole piece E is released by the pole piece unreeling roller 21, passes through the lithium supplementing gap and is pulled and reeled by the pole piece reeling roller 22.
Optionally, the electrode lithium supplementing device is provided with a lithium supplementing stage and a heat insulation film guiding-out stage, and in the lithium supplementing stage, the pole piece E is unreeled by the pole piece unreeling roller 21, and is reeled by the pole piece reeling roller 22 after passing through a lithium supplementing gap for supplementing lithium; in the heat-insulating film S export stage, the first roller 51 is a pole piece unreeling roller 21, the second roller 52 is a pole piece reeling roller 22, and the two press rollers 11 are movably arranged so that the lithium supplementing gap is adjustable. By the arrangement, the pole piece unreeling roller 21 and the pole piece reeling roller 22 can be reused, so that the structure is simplified, the compactness of the structure is improved, and the occupied space is reduced. Specifically, since the thickness of the lithium-compensating electrode is greater than the width of the lithium-compensating gap, the gap between the two press rolls 11 needs to be increased, i.e., the width of the lithium-compensating gap is adjusted to allow the lithium-compensating electrode to pass through when the heat-insulating film S is led out.
Optionally, a third roller 53 is provided between the lithium film delivery mechanism 3 and the pole piece delivery mechanism 2. The arrangement is favorable for further improving the compactness of the structure of the electrode lithium supplementing device and reducing the occupied space.
Alternatively, the lithium film conveying mechanism 3 includes a lithium film unreeling roller 31 and a lithium film reeling roller 32 which are arranged parallel to the press roller 11, and the lithium film unreeling roller 31 and the lithium film reeling roller 32 are respectively arranged at two sides of the rolling mechanism 1. Specifically, the lithium film unreeling roller 31, the lithium film reeling roller 32 and the press roller 11 are arranged in parallel. The lithium film L is released by the lithium film unreeling roller 31, passes through the lithium supplementing gap, and is pulled and reeled by the lithium film reeling roller 32.
Optionally, the lithium film conveying mechanism 3 is provided with a group, and the lithium film conveying mechanism 3 is arranged on one side of the conveying mechanism, so that lithium can be supplemented to one side of the polar plate E.
Optionally, the pole piece E includes a current collector E1 and an electrode dressing E2 disposed on a surface of the current collector E1.
Alternatively, referring to fig. 3, the lithium film L includes a base film L1 and a metallic lithium layer L2 provided on the base film L1, the metallic lithium layer L2 and an electrode dressing E2 of the electrode sheet E being disposed opposite to each other. The lithium film L moves under the traction action of the lithium film wind-up roller 32, and the pole piece E moves in the same direction under the action of the pole piece wind-up roller 22, and as the metal lithium layer L2 of the lithium film L and the electrode dressing E2 of the pole piece E are oppositely arranged, the metal lithium on the lithium film L is peeled off from the base film L1 under the pressure action of the rolling mechanism 1 and is covered on the pole piece E, namely, the electrode dressing E2.
Alternatively, in this embodiment, referring to fig. 1, the lithium film conveying mechanisms 3 are provided with two groups, and the two groups of lithium film conveying mechanisms 3 are respectively provided at two sides of the pole piece E, where the sum of the thicknesses of the pole piece E and the two lithium films L is greater than the width of the lithium supplementing gap. This makes it possible to double-sided lithium supplement to the electrode sheet E.
Alternatively, the heat-insulating film unreeling mechanism 4 comprises a heat-insulating film unreeling roller 41 arranged in parallel with the press roller 11, and the heat-insulating film unreeling roller 41 is arranged between the pole piece conveying mechanism 2 and the lithium film conveying mechanism 3. The arrangement is beneficial to the compact structure of the electrode lithium supplementing device and reduces the occupied space.
And the lithium supplementing electrode is obtained after the lithium supplementing of the pole piece E, the heat insulation film is discharged by the heat insulation film unreeling roller 41, the other end of the heat insulation film S is pulled by the pole piece reeling roller 22 and is reeled together with the lithium supplementing electrode, and the lithium supplementing electrode pole roll covered with the heat insulation film S is obtained. After the lithium-supplementing electrode roll covered with the heat-insulating film S is subjected to high-temperature baking treatment, the heat-insulating film S in the lithium-supplementing electrode roll covered with the heat-insulating film S is pulled and wound by the third roller 53, the heat-insulating film S is led out, and the lithium-supplementing electrode is rewound by the pole piece unreeling roller 21, so that the lithium-supplementing electrode roll is obtained.
Example 2
A battery production system comprising the electrode lithium supplementing device described in example 1.
Example 3
An electrode lithium supplementing method using the electrode lithium supplementing device provided in example 1.
Specifically, referring to fig. 5, the electrode lithium supplementing method includes introduction of a heat insulating film S, standing at normal temperature, baking at high temperature, and removal of the heat insulating film S.
Optionally, the heat insulation film S introduction includes the steps of:
the pole piece E to be subjected to lithium supplementation and the lithium film L jointly penetrate through a lithium supplementation gap of the rolling mechanism 1, and the pole piece E to be subjected to lithium supplementation is opposite to a metal lithium layer L2 of the lithium film L;
drawing a pole piece E to be subjected to lithium supplementation and a lithium film L to move in the same direction, and rolling by a rolling mechanism 1 to enable metal lithium in the lithium film L to be covered on the pole piece E to be subjected to lithium supplementation, so as to obtain a lithium supplementation electrode;
and (3) simultaneously winding the heat insulation film S and the lithium supplementing electrode to obtain the lithium supplementing electrode coil covered with the heat insulation film S.
In the normal temperature standing step, under the normal temperature condition, the lithium metal in the lithium supplementing electrode coil and the electrode surface generate lithiation reaction, the heat insulation film S absorbs the redundant heat released in the lithiation reaction process, the lithiation reaction rate of the lithium metal and the electrode is effectively controlled, and the damage problem in the lithium supplementing process of the electrode is eliminated.
Optionally, the high-temperature baking includes placing the lithium-supplementing electrode coil covered with the heat-insulating film S in an oven for vacuum high-temperature baking. Under the high temperature condition, the lithiation reaction rate of the metal lithium and the electrode is improved, and the working efficiency of the electrode lithium supplementing process is further improved.
Optionally, the heat insulation film S is led out by traction, and the lithium-supplementing electrode coil is obtained by rewinding.
Specifically, when the pole piece E supplements lithium, under the action of the traction force of the pole piece winding roller 22, the pole piece E of the pole piece E unreeling mechanism and the lithium film L jointly pass through a lithium supplementing gap of the rolling mechanism 1, the pole piece E to be supplemented with lithium is opposite to a metal lithium layer L2 of the lithium film L, and as the width of the lithium supplementing gap is smaller than the sum of the thickness of the pole piece E and the thickness of the lithium film L, under the action of the pressure of the rolling mechanism 1, the metal lithium in the lithium film L is stripped from the base film L1 and covered on the pole piece E to obtain the lithium supplementing electrode. And rolling under the action of the traction force of the pole piece rolling roller 22, covering the heat insulation film S on the surface of the lithium supplementing electrode in the rolling process to obtain a lithium supplementing electrode roll covered with the heat insulation film S, and placing the lithium supplementing electrode roll covered with the heat insulation film S in an oven for vacuum high-temperature baking. And finally, winding, pulling, guiding and winding the heat insulation film S through a heat insulation film guiding mechanism 5, and rewinding the lithium supplementing electrode through a pole piece E unreeling mechanism to obtain a lithium supplementing electrode pole roll.
Optionally, in the high temperature baking step, different temperatures are baked for different durations. Optionally, the high temperature baking includes five stages, respectively: a first stage, wherein the baking time is 3 hours at the temperature higher than 100 ℃; a second stage, wherein the baking time is 3 hours in the temperature range of 80-100 ℃; the third stage, baking time is 4 hours in the temperature range of 60-80 ℃; a fourth stage, wherein the baking time is 6 hours in the temperature range of 40-60 ℃; and a fifth stage, wherein the baking time is 8 hours in the temperature range of 25-40 ℃.
And placing a temperature measuring probe of a temperature monitor in the lithium-supplementing electrode coil, and monitoring and recording the real-time temperature of the lithium-supplementing electrode coil covered with the heat insulation film S under the vacuum normal-temperature standing condition in the oven, so as to qualitatively analyze the reaction degree of the lithium-supplementing electrode in the vacuum normal-temperature standing process. And recording and comparing through digital photos, and qualitatively analyzing the lithium supplementing effect and the lithium supplementing degree of the electrode. Taking the simulated battery prepared by the lithium-supplementing electrode sheet E after vacuum normal temperature standing for electrochemical test, and performing electrochemical performance test within the voltage range of 0.05-1.5V: the first three rounds of charge and discharge at 0.1C rate followed by 0.5C rate evaluate the electrochemical performance of the lithium-compensating electrode. After the lithium is supplemented to the electrode by the electrode lithium supplementing method provided by the embodiment, the first-circle charging specific capacity is 623mAh/g, the first-circle discharging specific capacity is 556mAh/g, the first-circle coulomb efficiency is 89%, and the 200-circle capacity retention rate reaches 90%.
The lithium supplementing electrode obtained by the electrode lithium supplementing method provided by the embodiment can effectively control the reaction rate of metal lithium and an alloy type negative electrode lithium supplementing process, effectively absorb the excessive heat released in the lithiation reaction process, and eliminate the damage problem in the electrode lithium supplementing process and the potential safety hazard problem caused by heat generation of the lithiation reaction.
Example 4
The difference between the electrode lithium supplementing method and the embodiment 3 is that the high-temperature baking step comprises two stages, specifically, a first stage, wherein the baking time is 18 hours in the temperature range of 40-60 ℃; and in the second stage, the baking time is 6 hours at the temperature of 25-40 ℃.
Electrochemical performance test was performed on the lithium-compensating electrode in the same manner as in example 3. After the lithium is supplemented to the electrode by the electrode lithium supplementing method provided by the embodiment, the first-circle charging specific capacity is 630mAh/g, the first-circle discharging specific capacity is 586mAh/g, the first-circle coulomb efficiency is 93%, and the 200-circle capacity retention rate is 97%. The lithium supplementing method for the electrode can effectively balance the relation between the lithium supplementing efficiency of the alloy type negative electrode and the performance loss of the electrode after lithium supplementation, specifically, the lithium supplementing method for the electrode has the advantages that the lithium supplementing method for the electrode can be used for obtaining longer cycle life after being baked at the high temperature for the same time as that of the embodiment 3, or the lithium supplementing method for the electrode can be used for achieving the same cycle life as that of the embodiment 3, the high-temperature baking time is shorter, and the lithium supplementing efficiency of the electrode is higher.
According to the above description, the present patent application has the following advantages:
1. the heat insulation film S is arranged on the surface of the lithium-supplementing electrode in the winding process of the lithium-supplementing electrode and wound into the electrode roll, the metal lithium in the electrode roll of the lithium-supplementing electrode and the surface of the electrode undergo lithiation reaction, the heat insulation film S absorbs excessive heat released in the lithiation reaction process, the lithiation reaction rate of the metal lithium and the electrode is effectively controlled, and the damage problem in the lithium-supplementing process of the electrode and the potential safety hazard problem caused by heat generation of the lithiation reaction are eliminated;
2. by arranging the heat-insulating film guiding-out mechanism 5, placing the lithium-supplementing electrode coil covered with the heat-insulating film S on the first roller 51, unreeling the first roller 51, separating the lithium-supplementing electrode from the heat-insulating film S, wherein the lithium-supplementing electrode is reeled in by the second roller 52, and the heat-insulating film S is reeled in by the third roller 53, so that the rewinding of the lithium-supplementing electrode coil covered with the heat-insulating film S is realized, and the heat-insulating film S is guided out in the rewinding process, thereby obtaining the lithium-supplementing electrode coil;
3. the lithium film conveying mechanisms 3 are provided with two groups, and the two groups of lithium film conveying mechanisms 3 are respectively arranged on two sides of the pole piece E, so that double-sided lithium supplementing can be carried out on the pole piece E;
4. the pole piece unreeling roller 21 is used as a first roller 51, and the pole piece reeling roller 22 is used as a second roller 52, so that the structure is simplified, the compactness of the structure is improved, and the occupied space is reduced;
5. the method of leading in the heat insulation film S, standing at normal temperature, baking at high temperature and leading out the heat insulation film S is adopted for lithium supplementing, so that the relationship between the lithium supplementing efficiency of the alloy type negative electrode and the performance loss of the electrode after lithium supplementing can be effectively balanced.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (10)
1. An electrode lithium supplementing device, comprising:
the rolling mechanism comprises two oppositely arranged press rolls, a lithium supplementing gap is reserved between the two press rolls,
the pole piece conveying mechanism is used for driving the pole piece to be subjected to lithium supplement to pass through the lithium supplement gap;
the lithium film conveying mechanism is used for driving a lithium film to pass through the lithium supplementing gap, and the sum of the thicknesses of the pole piece and the lithium film is larger than the width of the lithium supplementing gap;
and the heat insulation film unreeling mechanism is arranged at the reeling end of the pole piece conveying mechanism and used for guiding in the heat insulation film so as to cover the heat insulation film and the lithium supplementing electrode.
2. The electrode lithium supplementing device according to claim 1, comprising a heat insulating film discharging mechanism for discharging the heat insulating film so as to separate the heat insulating film from the lithium supplementing electrode.
3. The electrode lithium supplementing device according to claim 2, wherein the heat insulating film discharging mechanism includes a first roller for unreeling the lithium supplementing electrode roll covered with the heat insulating film, a second roller for reeling the lithium supplementing electrode, and a third roller for reeling the heat insulating film.
4. The electrode lithium supplementing device according to claim 3, wherein the pole piece conveying mechanism comprises a pole piece unreeling roller and a pole piece reeling roller which are arranged in parallel with the press roller, and the pole piece unreeling roller and the pole piece reeling roller are respectively arranged on two sides of the rolling mechanism.
5. The electrode lithium supplementing device according to claim 4, wherein the electrode lithium supplementing device has a heat insulating film leading-out stage in which the first roller is the pole piece unreeling roller and the second roller is the pole piece winding roller, and the two pressing rollers are movably arranged so that the lithium supplementing gap is adjustable.
6. The electrode lithium supplementing device according to any one of claims 1 to 5, wherein the lithium film conveying mechanism comprises a lithium film unreeling roller and a lithium film reeling roller which are arranged in parallel with the press roller, and the lithium film unreeling roller and the lithium film reeling roller are respectively arranged on two sides of the rolling mechanism.
7. The electrode lithium supplementing device according to any one of claims 1 to 5, wherein the lithium film transporting mechanism is provided with a group; or the lithium film conveying mechanisms are provided with two groups, the two groups of lithium film conveying mechanisms are respectively arranged on two sides of the pole piece, and the sum of the thicknesses of the pole piece and the two lithium films is larger than the width of the lithium supplementing gap.
8. The electrode lithium supplementing device according to claim 7, wherein the heat-insulating film unreeling mechanism comprises a heat-insulating film unreeling roller which is arranged in parallel with the press roller, and the heat-insulating film unreeling roller is arranged between the pole piece conveying mechanism and the lithium film conveying mechanism.
9. The electrode lithium supplementing device according to any one of claims 1 to 5, wherein the pole piece comprises a current collector and an electrode dressing arranged on the surface of the current collector, the lithium film comprises a base film and a metal lithium layer arranged on the base film, and the metal lithium layer and the electrode dressing of the pole piece are oppositely arranged.
10. A battery production system comprising the electrode lithium supplementing device according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320385698.8U CN219419088U (en) | 2023-03-03 | 2023-03-03 | Electrode lithium supplementing device and battery production system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320385698.8U CN219419088U (en) | 2023-03-03 | 2023-03-03 | Electrode lithium supplementing device and battery production system |
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| Publication Number | Publication Date |
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| CN219419088U true CN219419088U (en) | 2023-07-25 |
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| CN202320385698.8U Active CN219419088U (en) | 2023-03-03 | 2023-03-03 | Electrode lithium supplementing device and battery production system |
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| Country | Link |
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| CN (1) | CN219419088U (en) |
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