CN219419088U - Electrode lithium supplementing device and battery production system - Google Patents

Abstract

The utility model provides an electrode lithium replenishment device and a battery production system, which relate to the technical field of batteries. The electrode lithium replenishing device includes a rolling mechanism, a pole piece conveying mechanism, a lithium film conveying mechanism and a thermal insulation film unwinding mechanism; the rolling mechanism includes two oppositely arranged pressure rollers, and a lithium supplement gap is left between the two pressure rollers; the pole piece conveying mechanism is used to drive the pole piece through the lithium supplement gap; together. The utility model can solve the problems of poor controllability of the reaction rate and potential safety hazards caused by reaction heat generation in the negative electrode pre-lithiation technology, can effectively control the lithiation reaction rate of metal lithium and the electrode, and eliminate the damage problem in the process of electrode lithium supplementation and the safety hazard caused by the heat generation of the lithiation reaction.

Description

An electrode lithium replenishment device and battery production system

technical field

The utility model relates to the technical field of batteries, in particular to an electrode lithium replenishment device and a battery production system.

Background technique

With the popularization of consumer electronic products, the development of the power battery field, and the iteration of grid energy storage, people put forward higher requirements for the energy density and cycle life of lithium-ion batteries. The application of high-capacity alloy-type negative electrodes is an important direction to improve the energy density of batteries. However, the formation of a solid electrolyte film (SEI film) on the surface of the negative electrode and the occurrence of side reactions during the first charge cycle of lithium-ion batteries cause the irreversible consumption of active lithium in the battery. Pre-lithiation technology is generally considered to be an effective solution to compensate for the loss of active lithium in the electrode and improve the energy density and cycle life of the battery.

At present, the negative electrode pre-lithiation technology usually uses a rolling process to press metal lithium onto the surface of the negative electrode for lithium supplementation. However, the reaction rate of metal lithium and the alloy-type negative electrode is fast during the process of pressing and replenishing lithium, and a large amount of heat is generated, which ultimately shows poor controllability of the lithiation reaction rate, rapid lithiation reaction leads to damage such as blackening of the electrode surface, and there are certain safety hazards in the production process of lithium supplementation.

Utility model content

The technical problem to be solved by the utility model is to overcome the disadvantages of poor controllability of the reaction rate and potential safety hazards caused by reaction heat generation in the negative electrode pre-lithiation technology in the prior art, so as to provide an electrode lithium replenishing device and a battery production system.

In order to solve the above problems, the utility model provides an electrode lithium replenishing device on the one hand, including a rolling mechanism, a pole piece conveying mechanism, a lithium film conveying mechanism, and a heat-insulating film unwinding mechanism; the rolling mechanism includes two oppositely arranged pressure rollers, and a lithium replenishing gap is left between the two pressure rollers; the pole piece conveying mechanism is used to drive the pole piece to be replenished through the lithium replenishing gap; , used to introduce the heat insulation film, so that the heat insulation film and the lithium supplementary electrode are laminated.

Optionally, a thermal insulation film derivation mechanism is included, and the thermal insulation film derivation mechanism is used for deriving the thermal insulation film to separate the thermal insulation film from the lithium supplementary electrode.

Optionally, the heat insulating film lead-out mechanism includes a first roll for unwinding the lithium supplementary electrode roll coated with a heat insulating film, a second roll for winding the lithium supplementary electrode, and a third roll for winding the heat insulating film.

Optionally, the pole piece conveying mechanism includes a pole piece unwinding roller and a pole piece winding roller arranged parallel to the pressure roller, and the pole piece unwinding roller and pole piece winding roller are respectively arranged on both sides of the rolling mechanism.

Optionally, the electrode lithium replenishing device has a thermal insulation film derivation stage. In the thermal insulation film derivation stage, the first roller is the pole piece unwinding roller, the second roller is the pole piece winding roller, and the two pressure rollers can be set movably so that the lithium supplement gap can be adjusted.

Optionally, the third roller is arranged between the lithium film conveying mechanism and the pole piece conveying mechanism.

Optionally, the lithium film conveying mechanism includes a lithium film unwinding roller and a lithium film winding roller arranged in parallel with the pressure roller, and the lithium film unwinding roller and lithium film winding roller are respectively arranged on both sides of the rolling mechanism.

Optionally, there is one set of lithium membrane transport mechanisms; or two sets of lithium membrane transport mechanisms, the two sets of lithium membrane transport mechanisms are respectively arranged on both sides of the pole piece, and the sum of the thicknesses of the pole piece and the two lithium films is greater than the width of the lithium supplement gap.

Optionally, the thermal insulation film unwinding mechanism includes a thermal insulation film unwinding roller arranged parallel to the pressure roller, and the thermal insulation film unwinding roller is arranged between the pole piece conveying mechanism and the lithium film conveying mechanism.

Optionally, the pole piece includes a current collector and an electrode coating provided on the surface of the current collector.

Optionally, the lithium film includes a base film and a lithium metal layer disposed on the base film, and the lithium metal layer is disposed opposite to the electrode coating of the pole piece.

Another aspect of the utility model provides a battery production system, including the electrode lithium replenishing device described in any one of the above technical solutions.

The utility model has the following advantages:

1. Utilize the technical scheme of the present utility model, convey the pole piece through the pole piece conveying mechanism, make the pole piece pass through the lithium replenishing gap between the two pressure rollers, at the same time, transport the lithium film through the lithium film conveying mechanism, make the lithium film pass through the lithium replenishing gap, because the sum of the thickness of the pole piece and the lithium film is greater than the width of the lithium replenishing gap, therefore, under the pressure of the pressing roller, the metal lithium in the lithium film is peeled off and laminated on the pole piece to obtain a lithium replenishing electrode; At the winding end, the thermal insulation film unwinding mechanism can unwind the thermal insulation film. Under the winding action of the pole sheet conveying mechanism, the thermal insulation film and the lithium-replenishing electrode are rewound at the same time, and the lithium-replenishing electrode coil covered with the thermal insulation film is obtained. During the winding process of the lithium-replenishing electrode, the heat-insulating film is placed on the surface of the lithium-replenishing electrode and wound into the pole roll. Under normal temperature conditions, the metal lithium in the lithium-replenishing electrode roll and the electrode surface undergo a lithiation reaction. The heat-insulating film absorbs the excess heat released during the lithiation reaction, effectively controls the lithiation reaction rate between the metal lithium and the electrode, and eliminates the damage caused by the lithium-replenishing process of the electrode and the potential safety hazards caused by the heat generated by the lithiation reaction.

2. By setting the thermal insulation film export mechanism, the lithium supplementary electrode roll covered with the thermal insulation film is placed on the first roller, and the lithium supplementary electrode is separated from the thermal insulation film by unwinding from the first roller. The lithium supplementary electrode is rewound by the second roller, and the thermal insulation film is rewound by the third roller, so that the rewinding of the lithium supplementary electrode coil covered with the thermal insulation film is realized, and the thermal insulation film is exported during the rewinding process, thereby obtaining the lithium supplementary electrode coil.

3. In the lead-out stage of the heat insulation film, the pole piece unwinding roller is used as the first roller, and the pole piece winding roller is used as the second roller, which is conducive to simplifying the structure, improving the compactness of the structure, and reducing the occupied space.

4. There are two sets of lithium film conveying mechanisms, which are respectively set on both sides of the pole piece, which can replenish lithium on both sides of the pole piece.

5. The third roller is set between the lithium film conveying mechanism and the pole piece conveying mechanism, and the thermal insulation film unwinding roller is set between the pole piece conveying mechanism and the lithium film conveying mechanism, which is conducive to making the structure of the electrode lithium supplementing device compact and reduces the occupied space.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are some implementations of the utility model. For those of ordinary skill in the art, other accompanying drawings can also be obtained according to these drawings without paying creative work.

Fig. 1 shows the structural representation of the electrode lithium replenishment device provided by the utility model in the lithium replenishment stage;

Fig. 2 shows the structural schematic diagram of the electrode lithium supplementing device provided by the utility model in the derivation stage of the heat insulation film;

Fig. 3 shows the schematic structural view of the lithium film in the electrode lithium replenishing device provided by the utility model;

Fig. 4 shows the cross-sectional view of the lithium supplementary electrode structure obtained by introducing the heat insulating film into the electrode lithium supplementary device provided by the embodiment of the present invention;

Fig. 5 shows a process flow chart of using the electrode lithium replenishment device provided by the embodiment of the present invention to replenish lithium to the electrode.

Explanation of reference signs:

1. Rolling mechanism; 11. Pressure roller; 2. Pole piece conveying mechanism; 21. Pole piece unwinding roller; 22. Pole piece rewinding roller; 3. Lithium film conveying mechanism; 31. Lithium film unwinding roller; 32. Lithium film rewinding roller; Metal lithium layer; E, pole piece; E1, current collector; E2, electrode dressing; S, heat insulation film.

Detailed ways

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and so on is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, or it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

In order to facilitate the introduction of the technical solution of the utility model, it will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the embodiments should not be regarded as limitations on the utility model.

Example 1

An electrode lithium replenishing device, referring to FIG. 1 , includes a rolling mechanism 1, a pole piece conveying mechanism 2, a lithium film conveying mechanism 3, and a thermal insulation film unwinding mechanism 4; the rolling mechanism 1 includes two oppositely arranged pressure rollers 11, and a lithium replenishment gap is left between the two pressure rollers 11; the pole piece conveying mechanism 2 is used to drive the pole piece E to be supplemented with lithium to pass through the lithium replenishment gap; the lithium film conveying mechanism 3 is used to drive the lithium film L through the lithium replenishment gap, and the sum of the thicknesses of the pole piece E and the lithium film L is greater than the width of the lithium replenishment gap; the heat insulation film unwinding mechanism 4 It is installed at the winding end of the pole piece conveying mechanism 2, and is used to introduce the heat insulation film S, so that the heat insulation film S and the lithium supplementary electrode are laminated.

Utilizing the technical solution of the present utility model, the pole piece E is transported through the pole piece conveying mechanism 2, so that the pole piece E passes through the lithium replenishing gap between the two pressure rollers 11, and at the same time, the lithium film L is conveyed through the lithium film conveying mechanism 3, so that the lithium film L passes through the lithium replenishing gap. Since the sum of the thicknesses of the pole piece E and the lithium film L is greater than the width of the lithium replenishing gap, under the pressure of the pressure roller 11, the metal lithium in the lithium film L is peeled off and laminated on the pole piece E to obtain a lithium replenishing electrode; The hot film unwinding mechanism 4 is arranged at the winding end of the pole piece conveying mechanism 2, and the heat insulating film unwinding mechanism 4 can unwind the heat insulating film S. Under the winding effect of the pole piece conveying mechanism 2, the heat insulating film S and the lithium supplementary electrode are simultaneously rewound, and the lithium supplementary electrode covered with the heat insulating film S is obtained, as shown in FIG. 4 . By placing the thermal insulation film S on the surface of the lithium supplementary electrode during the winding process of the lithium supplementary electrode and winding it into the pole coil, under normal temperature conditions, the metal lithium in the lithium supplementary electrode coil and the electrode surface undergoes a lithiation reaction, and the thermal insulation film S absorbs the excess heat released during the lithiation reaction, effectively controls the lithiation reaction rate of the metal lithium and the electrode, and eliminates the damage during the lithium supplementation process of the electrode and the potential safety hazards caused by the heat generated by the lithiation reaction.

Optionally, referring to FIG. 2 , the electrode lithium supplementing device includes a thermal insulation film derivation mechanism 5 for deriving the thermal insulation film S to separate the thermal insulation film S from the lithium supplementary electrode.

The heat insulating film lead-out mechanism 5 includes a first roller 51 for unwinding a lithium supplementary electrode roll covered with a heat insulating film S, a second roller 52 for winding a lithium supplementary electrode, and a third roller 53 for winding the heat insulating film S.

Specifically, the first roll 51 is unwound, the third roll 53 winds the heat insulating film S, separates the heat insulating film S from the lithium-replenishing electrode and leads it out, and the third roll 53 reversely winds the lithium-replenishing electrode, that is, rewinding, so as to obtain a lithium-replenishing electrode roll. By providing the thermal insulation film derivation mechanism 5, the efficiency of derivation of the thermal insulation film S can be improved, and the working efficiency of electrode lithium supplementation can be improved.

Optionally, the pole piece conveying mechanism 2 includes a pole piece unwinding roller 21 and a pole piece winding roller 22 arranged in parallel with the pressure roller 11, and the pole piece unwinding roller 21 and the pole piece winding roller 22 are arranged on both sides of the rolling mechanism 1 respectively. Specifically, the pole piece unwinding roller 21 , the pole piece winding roller 22 and the pressure roller 11 are arranged in parallel. The electrode pole piece E is released by the pole piece unwinding roller 21 , the pole piece E passes through the lithium filling gap, and is pulled and wound by the pole piece winding roller 22 .

Optionally, the electrode lithium replenishment device has a lithium replenishment stage and a thermal insulation film derivation stage. In the lithium replenishment stage, the pole piece unwinding roller 21 unwinds the pole piece E, and the pole piece E is rewound by the pole piece winding roller 22 after passing through the lithium supplementation gap for lithium supplementation; in the derivation stage of the heat insulation film S, the first roller 51 is the pole piece unwinding roller 21, and the second roller 52 is the pole piece winding roller 22. With this arrangement, the pole piece unwinding roller 21 and the pole piece winding roller 22 can be reused, which is beneficial to simplify the structure, improve the compactness of the structure, and reduce the occupied space. Specifically, since the thickness of the lithium-replenishing electrode is greater than the width of the lithium-replenishing gap, it is necessary to increase the gap between the two pressure rollers 11 when the heat insulation film S is derived, that is, to adjust the width of the lithium-replenishing gap for the lithium-replenishing electrode to pass through.

Optionally, the third roller 53 is arranged between the lithium film conveying mechanism 3 and the pole piece conveying mechanism 2 . Such setting is beneficial to further improve the compactness of the structure of the electrode lithium replenishment device and reduce the occupied space.

Optionally, the lithium film conveying mechanism 3 includes a lithium film unwinding roller 31 and a lithium film winding roller 32 arranged in parallel with the pressure roller 11 , and the lithium film unwinding roller 31 and lithium film winding roller 32 are respectively arranged on both sides of the rolling mechanism 1 . Specifically, the lithium film unwinding roller 31 , the lithium film winding roller 32 and the pressing roller 11 are arranged in parallel. The lithium film L is released by the lithium film unwinding roller 31 , the lithium film L passes through the lithium filling gap, and is drawn and wound by the lithium film winding roller 32 .

Optionally, there is a set of lithium membrane conveying mechanism 3, and the lithium membrane conveying mechanism 3 is arranged on one side of the conveying mechanism, which can replenish lithium on one side of the pole piece E.

Optionally, the pole piece E includes a current collector E1 and an electrode coating E2 provided on the surface of the current collector E1.

Optionally, referring to FIG. 3 , the lithium film L includes a base film L1 and a metal lithium layer L2 disposed on the base film L1 , and the metal lithium layer L2 is opposite to the electrode coating E2 of the pole piece E. The lithium film L moves under the traction of the lithium film winding roller 32, and the pole piece E moves in the same direction under the action of the pole piece winding roller 22. Since the metal lithium layer L2 of the lithium film L and the electrode coating E2 of the pole piece E are arranged oppositely, under the pressure of the rolling mechanism 1, the metal lithium on the lithium film L is peeled off from the base film L1 and coated on the pole piece E, that is, coated on the electrode coating E2.

Optionally, in this embodiment, referring to FIG. 1 , there are two sets of lithium film transport mechanisms 3, and the two sets of lithium film transport mechanisms 3 are respectively arranged on both sides of the pole piece E, and the sum of the thicknesses of the pole piece E and the two lithium films L is greater than the width of the lithium replenishment gap. In this way, double-sided lithium supplementation can be performed on the pole piece E.

Optionally, the thermal insulation film unwinding mechanism 4 includes a thermal insulation film unwinding roller 41 arranged parallel to the pressure roller 11 , and the thermal insulation film unwinding roller 41 is arranged between the pole piece conveying mechanism 2 and the lithium film conveying mechanism 3 . Such setting is beneficial to make the structure of the electrode lithium replenishing device compact and reduce the occupied space.

After the pole piece E is supplemented with lithium, a lithium supplementary electrode is obtained. The thermal insulation film unwinding roller 41 releases the thermal insulation film S, and the other end of the thermal insulation film S is pulled by the pole piece winding roller 22, and is wound together with the lithium supplementary electrode to obtain a lithium supplementary electrode coil covered with the thermal insulation film S. After the lithium-replenishing electrode roll covered with the heat-insulating film S is subjected to high-temperature baking treatment, the heat-insulating film S in the lithium-replenishing electrode roll coated with the heat-insulating film S is drawn and wound by the third roller 53, and the heat-insulating film S is drawn out, and the lithium-replenishing electrode is rewound by the pole piece unwinding roller 21 to obtain a lithium-replenishing electrode roll.

Example 2

A battery production system, comprising the electrode lithium replenishment device described in Embodiment 1.

Example 3

A method for replenishing lithium on an electrode, utilizing the device for replenishing lithium on an electrode provided in Example 1.

Specifically, referring to FIG. 5 , the lithium supplementation method for the electrode includes introducing the heat insulating film S, standing at room temperature, baking at high temperature, and deriving the heat insulating film S.

Optionally, the introduction of heat insulation film S includes the following steps:

The pole piece E to be supplemented with lithium and the lithium film L pass through the lithium supplementation gap of the rolling mechanism 1, and the pole piece E to be supplemented with lithium is opposite to the metal lithium layer L2 of the lithium film L;

Pulling the pole piece E to be supplemented with lithium and the lithium film L to move in the same direction, the rolling mechanism 1 rolls, so that the metal lithium in the lithium film L is laminated on the pole piece E to be supplemented with lithium, and a lithium supplementary electrode is obtained;

The thermal insulation film S and the lithium-replenishing electrode are rolled simultaneously to obtain the lithium-replenishing electrode pole roll covered with the thermal insulation film S.

In the step of standing at room temperature, under normal temperature conditions, the metal lithium in the lithium-supplementing electrode roll and the electrode surface undergo a lithiation reaction, and the thermal insulation film S absorbs the excess heat released during the lithiation reaction, effectively controlling the lithium metal and the electrode The lithiation reaction rate eliminates the problem of damage to the electrode during lithium supplementation.

Optionally, the high-temperature baking includes placing the lithium-supplementing electrode roll coated with the heat-insulating film S in an oven for vacuum-baking at high temperature. Under high temperature conditions, the reaction rate of metal lithium and electrode lithiation is increased, thereby improving the working efficiency of the electrode lithium supplementation process.

Optionally, the derivation of the thermal insulation film S includes pulling out the thermal insulation film S, and rewinding to obtain the lithium supplementary electrode pole roll.

Specifically, when the pole piece E is supplemented with lithium, under the traction force of the pole piece winding roller 22, the pole piece E of the pole piece E unwinding mechanism and the lithium film L pass through the lithium filling gap of the rolling mechanism 1 together, and the pole piece E to be replenished with lithium is opposite to the metal lithium layer L2 of the lithium film L. Since the width of the lithium filling gap is smaller than the sum of the thickness of the pole piece E and the thickness of the lithium film L, under the pressure of the rolling mechanism 1, the metal lithium in the lithium film L is peeled off from the base film L1 and laminated on the pole piece E Obtain a lithium-supplementing electrode. Under the action of the traction force of the pole piece winding roller 22, the heat insulation film S is coated on the surface of the lithium supplementary electrode during the winding process to obtain a lithium supplementary electrode coil covered with the heat insulation film S, and the lithium supplementary electrode coil covered with the heat insulation film S is placed in an oven for vacuum baking at high temperature. Finally, the thermal insulation film S is wound, drawn, and rolled up by the thermal insulation film deriving mechanism 5, and the lithium supplementary electrode is rewound by the pole piece E unwinding mechanism to obtain the lithium supplementary electrode roll.

Optionally, in the high-temperature baking step, different temperatures are used for different durations of baking. Optionally, high-temperature baking includes five stages, which are: the first stage, at a temperature higher than 100°C, the baking time is 3 hours; the second stage, at a temperature range of 80-100°C, the baking time is 3 hours; the third stage, at a temperature range of 60-80°C, the baking time is 4 hours; the fourth stage, at a temperature range of 40-60°C, the baking time is 6 hours; .

Place the temperature measuring probe of the temperature monitor inside the lithium-replenishing electrode coil, monitor and record the real-time temperature of the lithium-replenishing electrode coil covered with heat-insulating film S under the condition of standing in vacuum at room temperature in the oven, and use it to qualitatively analyze the reaction degree of the lithium-replenishing electrode during vacuum standing at room temperature. Through digital photo recording and comparison, qualitative analysis of lithium supplementation effect and lithium supplementation degree of the electrode. Electrochemical tests were performed on the simulated battery prepared by the lithium-replenishing electrode sheet E after standing in vacuum at room temperature, and the electrochemical performance test was carried out in the voltage range of 0.05-1.5V: the first three cycles were charged and discharged at a rate of 0.1C, and then the electrochemical performance of the lithium-replenishing electrode was evaluated at a rate of 0.5C. After supplementing the electrode with lithium by the electrode lithium supplementing method provided in this example, the first cycle charge specific capacity is 623mAh/g, the first cycle discharge specific capacity is 556mAh/g, the first cycle coulombic efficiency is 89%, and the 200 cycle capacity retention rate reaches 90%.

The lithium-replenishing electrode obtained by using the electrode lithium-replenishing method provided in this example can effectively control the reaction rate of metal lithium and the alloy-type negative electrode during the lithium-replenishing process, effectively absorb the excess heat released during the lithiation reaction, and eliminate the damage problem during the electrode lithium repletion process and the potential safety hazard caused by the heat generation of the lithiation reaction.

Example 4

A method for replenishing lithium on an electrode, the difference from Example 3 is that the high-temperature baking step includes two stages, specifically, in the first stage, the baking time is 18 hours in the temperature range of 40-60°C; in the second stage, the baking time is 6 hours in the temperature range of 25-40°C.

The same method as in Example 3 was used to test the electrochemical performance of the lithium-supplemented electrode. After supplementing the electrode with lithium by the electrode lithium supplementing method provided in this example, the first cycle charge specific capacity is 630mAh/g, the first cycle discharge specific capacity is 586mAh/g, the first cycle coulombic efficiency is 93%, and the 200 cycle capacity retention rate reaches 97%. The electrode lithium supplement method provided in this example can effectively balance the relationship between the lithium supplement efficiency of the alloy-type negative electrode and the electrode performance loss after lithium supplementation. Specifically, a longer cycle life can be obtained at the same high-temperature baking time as in Example 3, or, the same cycle life can be achieved as in Example 3, and the high-temperature baking time is shorter, and the lithium supplement efficiency of the electrode is higher.

According to the above description, the patent application has the following advantages:

1. During the winding process of the lithium-replenishing electrode, the thermal insulation film S is placed on the surface of the lithium-replenishing electrode and wound into the pole coil. The metal lithium in the lithium-replenishing electrode coil and the electrode surface undergo a lithiation reaction, and the heat-insulating film S absorbs the excess heat released during the lithiation reaction, effectively controlling the lithiation reaction rate between the metal lithium and the electrode, and eliminating the potential safety hazards caused by damage during the lithium supplementation process of the electrode and the heat generated by the lithiation reaction;

2. By setting the thermal insulation film deriving mechanism 5, the lithium supplementary electrode roll covered with the thermal insulation film S is placed on the first roll 51, unrolled by the first roll 51, and the lithium supplementary electrode is separated from the thermal insulation film S, wherein the lithium supplementary electrode is wound up by the second roll 52, and the thermal insulation film S is wound up by the third roll 53, realizing the rewinding of the lithium supplementary electrode roll coated with the thermal insulation film S, and exporting the thermal insulation film S during the rewinding process, thereby obtaining a lithium supplementary electrode coil;

3. There are two sets of lithium film conveying mechanisms 3, and the two sets of lithium film conveying mechanisms 3 are respectively arranged on both sides of the pole piece E, which can replenish lithium on both sides of the pole piece E;

4. Use the pole piece unwinding roller 21 as the first roller 51 and the pole piece winding roller 22 as the second roller 52, which is beneficial to simplify the structure, improve the compactness of the structure, and reduce the occupied space;

5. The method of introducing heat-insulating film S, standing at room temperature, baking at high temperature, and deriving heat-insulating film S for lithium supplementation can effectively balance the relationship between the lithium-supplementation efficiency of the alloy-type negative electrode and the electrode performance loss after lithium supplementation.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

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.