Pole piece lithium supplementing device and battery production equipment

Abstract

The embodiment of the utility model discloses a pole piece lithium supplementing device and battery production equipment, and belongs to the technical field of battery production, the pole piece lithium supplementing device is used for supplementing lithium to a base material, the pole piece lithium supplementing device comprises a lithium supplementing part, and the lithium supplementing part is used for supplementing lithium to a lithium supplementing surface of the base material; the positioning piece is used for determining a lithium removal position, where lithium ions need to be removed, on the base material; the lithium supplementing piece and the positioning piece are located on the upstream of the lithium removing piece; and when the base material is conveyed according to the preset speed and the lithium removal position on the base material is driven to be conveyed according to the preset speed, the lithium removal part is started when the conveying time of the lithium removal position on the base material reaches the preset time. According to the method, continuous lithium supplement of the base material is realized, intermittent lithium supplement of the base material can be realized according to actual requirements, continuous lithium supplement and intermittent lithium supplement of the base material are compatible to the greatest extent, the application range of the base material is widened, and the method can be effectively suitable for various battery preparation processes such as winding and lamination.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a pole piece lithium replenishing device and battery production equipment. Background Art

[0002] During the initial charge and discharge process of a lithium-ion battery, a solid electrolyte will form on the surface of the negative electrode, consuming the active lithium ions in the battery and reducing the battery's coulombic efficiency and capacity. In addition, lithium-ion batteries will continue to consume active lithium during normal use, reducing the battery capacity and battery life.

[0003] Related technologies have developed lithium replenishment devices to replenish lithium ions consumed during the initial charge and discharge cycle of lithium-ion batteries, thereby increasing battery energy density. However, these devices are not well-suited for both continuous and intermittent lithium replenishment of the negative electrode. Utility Model Content

[0004] In view of the above problems, the present application provides a pole piece lithium replenishment device and battery production equipment, which can realize continuous lithium replenishment of the substrate while also realizing intermittent lithium replenishment of the substrate according to actual needs, and is compatible with continuous lithium replenishment and intermittent lithium replenishment of the substrate to the greatest extent, thereby improving the scope of application of the substrate and being effectively applicable to various battery preparation processes such as winding and lamination.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a pole piece lithium replenishing device for replenishing lithium to a substrate, the pole piece lithium replenishing device comprising a lithium replenishing component, the lithium replenishing component being used to replenish lithium to the lithium replenishing surface of the substrate; the positioning component being used to determine a lithium removal position on the substrate where lithium ions need to be removed; a lithium removal component, wherein along the transmission direction of the substrate, the lithium replenishing component and the positioning component are located upstream of the lithium removal component; wherein there is a preset distance between the positioning component and the lithium removal component for transmitting the substrate, and the substrate has a preset time for transmitting from the positioning component to the position of the lithium removal component at a preset speed; when the substrate is transmitted at a preset speed and drives the lithium removal position on the substrate to be transmitted at the preset speed, the lithium removal component is used to start when the transmission time of the lithium removal position on the substrate reaches the preset time.

[0007] In one feasible embodiment, the lithium removal member includes a first lithium removal member and a second lithium removal member; a channel for the substrate to pass through is formed between the first lithium removal member and the second lithium removal member, and when the substrate is located in the channel, the first lithium removal member and the second lithium removal member are respectively opposite to different surfaces of the substrate.

[0008] In one feasible embodiment, the positioning member includes a first positioning member and a second positioning member; a channel for the substrate to pass through is formed between the first positioning member and the second positioning member, and when the substrate is located in the channel, the first positioning member and the second positioning member are respectively opposite to different surfaces of the substrate.

[0009] In one feasible embodiment, the lithium replenishment component includes a lithium replenishment shell and a lithium replenishment source. The lithium replenishment shell has a lithium replenishment cavity. The lithium replenishment source is located in the lithium replenishment cavity. The lithium replenishment source is used to replenish lithium on the lithium replenishment surface of the substrate.

[0010] In one feasible embodiment, the number of the lithium replenishing sources includes multiple groups, and the multiple groups of lithium replenishing sources are located at different positions in the lithium replenishing chamber. Along the transmission direction of the substrate, the multiple groups of lithium replenishing sources are used to replenish lithium to the substrate in sequence.

[0011] In one feasible embodiment, each group of the lithium replenishing sources includes at least a first lithium replenishing source and a second lithium replenishing source; a channel for the substrate to pass through is formed between the first lithium replenishing source and the second lithium replenishing source, and when the substrate is located in the channel, the first lithium replenishing source and the second lithium replenishing source are respectively opposite to different surfaces of the substrate.

[0012] In one feasible embodiment, a power supply component is further included, which includes a first electrode and a second electrode, and the first electrode and the second electrode have opposite electrical properties; the first electrode is used to connect to the substrate, and the second electrode is connected to the lithium supplement component.

[0013] In one feasible embodiment, it further includes an impregnating member, which is located upstream of the lithium replenishing member along the transmission direction of the substrate; the electrode lithium replenishing device also includes a transmission member, which is located upstream of the impregnating member, and is used to transport the substrate to be replenished with lithium and drive the substrate to move along the transmission direction.

[0014] In a feasible embodiment, a cleaning member is further included, and the cleaning member is located downstream of the lithium replenishing member along the conveying direction of the substrate.

[0015] In a feasible embodiment, a drying component is further included, and the drying component is located downstream of the cleaning component along the conveying direction of the substrate.

[0016] In one possible implementation, the drying assembly includes a drying shell and a heating element, wherein the heating element is used to heat the cleaned substrate; and the drying shell is filled with an inert gas.

[0017] A second aspect of an embodiment of the present application provides a battery production device, including a pole piece lithium replenishing device.

[0018] An embodiment of the present application provides a pole piece lithium replenishment device and battery production equipment, including a positioning member and a lithium removal member. In this way, the positioning member can determine the lithium removal position on the substrate where lithium ions need to be removed according to actual needs, and the lithium removal member can remove the lithium ions plated on the lithium removal position during the lithium replenishment process. Therefore, while realizing continuous lithium replenishment of the substrate, the present application can also realize intermittent lithium replenishment of the substrate according to actual needs, and is compatible with continuous and intermittent lithium replenishment of the substrate to the greatest extent, thereby improving the scope of application of the substrate and being effectively applicable to various battery preparation processes such as winding and lamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of the electrode lithium replenishing device provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of the continuous lithium replenishment of the substrate provided in the embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the structure of the intermittent lithium replenishment of the substrate provided in the embodiment of the present application;

[0022] Figure 4 A schematic structural diagram of a lithium replenishing source and a first lithium replenishing position of a substrate provided in an embodiment of the present application;

[0023] Figure 5 This is a schematic structural diagram of the lithium replenishment source and the second lithium replenishment site of the substrate provided in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 100-Pole lithium replenishing device;

[0026] 110 - lithium replenishing component; 111 - lithium replenishing housing; 112 - lithium replenishing chamber;

[0027] 113 - lithium supplement source; 114 - wire; 115 - conductive support rod;

[0028] 116 - conductive back plate; 117 - insulating layer; 118 - lithium metal layer;

[0029] 120- positioning member; 121- first positioning member; 122- second positioning member;

[0030] 130 - lithium removal member; 131 - first lithium removal member; 132 - second lithium removal member;

[0031] 140-power supply; 141-power supply; 142-power supply circuit;

[0032] 150-wetted parts; 151-wetted shell; 160-electrolyte;

[0033] 170-transmission member; 171-transmission roller; 172-conductive roller;

[0034] 180-cleaning element; 181-cleaning housing; 182-cleaning fluid;

[0035] 190-drying assembly; 191-drying shell; 192-heating element;

[0036] 193-inert gas;

[0037] 200 - base material; 210 - first dressing surface; 220 - second dressing surface;

[0038] 230-first lithium replenishing surface; 240-second lithium replenishing surface; 250-substrate body;

[0039] 260-Metallic lithium deposited on a blank foil substrate. DETAILED DESCRIPTION

[0040] During the initial charge and discharge process of a lithium-ion battery, a solid electrolyte will form on the negative electrode surface, consuming the active lithium ions in the battery and reducing the battery's coulombic efficiency and capacity. In particular, silicon negative electrode batteries will experience 12%-30% irreversible lithium ion consumption in the first cycle, resulting in a significant decrease in the battery's reversible capacity. In addition, lithium-ion batteries will continue to consume active lithium during normal use, reducing battery capacity and battery life.

[0041] With the demand for higher energy density and longer cycle times (the number of times a battery can be charged and discharged), it is no longer possible to meet the demand for increased battery performance by simply replenishing the positive electrode with lithium. Therefore, it is urgent to develop negative electrode lithium replenishment equipment to replenish the lithium ions consumed during the initial charge and discharge process and the cycle, thereby improving battery performance such as energy density and cycle life.

[0042] In actual applications, for various battery preparation processes such as different winding and lamination processes, it is necessary not only to continuously replenish lithium to the negative electrode dressing area, but also to intermittently replenish lithium to the negative electrode dressing area.

[0043] It should be noted that intermittent lithium replenishment refers to a non-continuous lithium replenishment process, with intervals during the replenishment process. This is because these intervals require other processes such as tab preparation based on actual conditions. However, lithium replenishment devices in related technologies generally provide continuous lithium replenishment, which is not well compatible with both continuous and intermittent lithium replenishment of the negative electrode. They are also not well suited for various battery manufacturing processes such as winding and lamination, and therefore have a limited scope of application.

[0044] In response to the above technical problems, an embodiment of the present application provides a pole piece lithium replenishment device and battery production equipment, including a positioning part and a lithium removal part. In this way, the positioning part can determine the lithium removal position on the substrate where lithium ions need to be removed according to actual needs, and the lithium removal part can remove the lithium ions plated on the lithium removal position during the lithium replenishment process. Therefore, while realizing continuous lithium replenishment of the substrate, the present application can also realize intermittent lithium replenishment of the substrate according to actual needs, and is compatible with continuous and intermittent lithium replenishment of the substrate to the greatest extent, thereby improving the scope of application of the substrate and being effectively applicable to various battery preparation processes such as winding and lamination.

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] Reference Figure 1 As shown, an embodiment of the present application provides a pole piece lithium replenishing device 100 for replenishing lithium to a substrate 200 .

[0047] In the embodiment of the present application, the electrode lithium replenishing device 100 may include a lithium replenishing component 110 , and the lithium replenishing component 110 is used to replenish lithium to the lithium replenishing surface of the substrate 200 .

[0048] In the embodiment of the present application, the lithium replenishment principle of the lithium replenishment component 110 is: using an electrochemical lithium replenishment method. Specifically, in a lithium-ion battery, an electrochemical reaction process is generated after the positive and negative electrodes are energized. An electric field is formed between the electrode of the lithium replenishment component 110 and the electrode of the lithium replenishment surface of the substrate 200. Under the action of the battery, the lithium replenishment component 110 loses electrons and becomes lithium ions, and enters the electrolyte. Under the action of the electric field, the lithium ions move to the electrode surface of the lithium replenishment surface to obtain electrons to participate in the reduction reaction, forming an SEI film or embedding into the active material lattice of the electrode piece to form an embedded compound or reacting with the active material of the electrode piece to form a lithium alloy, thereby completing the lithium replenishment of the electrode piece.

[0049] The lithium replenishing source of the lithium replenishing element 110 is generally an oxide, such as lithium manganese oxide, lithium cobalt oxide, etc. This embodiment does not limit this.

[0050] In the embodiments of the present application, there is no limitation on the type of substrate 200. For example, the substrate 200 may be a positive electrode plate, and the electrode plate lithium replenishing device 100 is used to replenish lithium for the positive electrode plate; or the substrate 200 may be a negative electrode plate, and the electrode plate lithium replenishing device 100 is used to replenish lithium for the negative electrode plate.

[0051] In this embodiment, the lithium replenishing device 100 for replenishing lithium on a negative electrode is mainly used as an example for description. For example, the negative electrode can be a copper foil current collector.

[0052] It should be noted that, referring to Figure 2 and Figure 3 As shown, a substrate 200, such as a negative electrode sheet, includes a substrate body 250 and a first dressing surface 210 and a second dressing surface 220 located on opposite sides of the substrate body 250. During the preparation process of the negative electrode sheet, graphite slurry is coated on the first dressing surface 210 and the second dressing surface 220. It should be noted that the graphite slurry and the substrate body 250 have different colors.

[0053] In the embodiment of the present application, the continuous lithium replenishment of the substrate 200 refers to: Figure 2 As shown, the first dressing surface 210 has a first lithium replenishing surface 230, and the second dressing surface 220 has a second lithium replenishing surface 240. The first lithium replenishing surface 230 and the second lithium replenishing surface 240 are continuously replenished with lithium. Intermittent lithium replenishment of the substrate 200 refers to: Figure 3 As shown, part of the surface of the first lithium replenishing surface 230 is not replenished with lithium, and part of the surface of the second lithium replenishing surface 240 is not replenished with lithium.

[0054] For example, refer to Figure 3 As shown, A51 is the dressing length of the first dressing surface 210, A52 is the distance between the two first dressing surfaces 210, and A5 is the total length. B51 is the dressing length of the second dressing surface 220, B52 is the distance between the two second dressing surfaces 220, and B5 is the total length.

[0055] In order to achieve intermittent lithium replenishment of the substrate 200, in the embodiment of the present application, referring to Figure 1 As shown, the electrode lithium replenishing device 100 may include a positioning member 120 and a lithium removing member 130. Along the conveying direction of the substrate 200, the lithium replenishing member 110 and the positioning member 120 are located upstream of the lithium removing member 130.

[0056] In the embodiment of the present application, the transport direction of the substrate 200 can refer to Figure 1 Indicated by the arrow direction.

[0057] In the embodiment of the present application, the lithium replenishing member 110 and the positioning member 120 are located upstream of the lithium removing member 130. That is, the lithium removing member 130 is located at the end of the electrode lithium replenishing device 100. This is because if the lithium removing member 130 is arranged before the lithium replenishing member 110, the substrate 200 after lithium removal needs to be replenished with lithium again under the action of the lithium replenishing member 110, which is a cumbersome process and has low lithium replenishment and removal effects. If the lithium removing member 130 is arranged before the positioning member 120, the positioning member 120 cannot play a positioning role.

[0058] It should be noted that the positional relationship between the lithium replenishing member 110 and the positioning member 120 is not limited. For example, the lithium replenishing member 110 may be located closer to the lithium removing member 130, or the positioning member 120 may be located closer to the lithium removing member 130. In this embodiment, the lithium replenishing member 110 is located between the positioning member 120 and the lithium removing member 130.

[0059] In the embodiment of the present application, the positioning member 120 is used to determine the delithiation location on the substrate 200 where lithium ions need to be removed. The type of positioning member 120 is not limited. For example, in this embodiment, the positioning member 120 may be a sensor, such as a color sensor or a camera sensor. In this embodiment, the positioning member 120 is primarily described as a color sensor.

[0060] Color sensors operate based on the optical properties of color. They typically illuminate an object using a built-in light source, typically red, green, and blue LEDs. Objects of different colors reflect light of varying wavelengths, and the sensor's photodetectors, such as photodiodes or phototransistors, receive this reflected light. Different colors of light reflect off the surface in varying proportions, resulting in varying light intensities received by the detectors. After photoelectric conversion, the sensor's internal processing circuitry analyzes the electrical signal to determine the object's color.

[0061] Therefore, in this embodiment, since the colors of the graphite slurry and the substrate body 250 are different, positioning can be performed based on the two different colors. Specifically, positioning is performed on the substrate body 250 that does not require lithium supplementation. For example, the positioning point can refer to Figure 3 As shown in points A and B, points A and B are the delithiation positions, and the distance between points A and B is the delithiation length.

[0062] In the present embodiment, the type of lithium removal element 130 is not limited. For example, the lithium removal element 130 in this embodiment can be a laser generator, and the laser beam generated by the laser generator is transmitted to the removal area through an optical path system. This embodiment is not limited to this.

[0063] In an embodiment of the present application, the positioning member 120 and the lithium removal member 130 are electrically connected, wherein the method of the electrical connection is not limited. For example, when the positioning member 120 determines the lithium removal position and the lithium removal length, the corresponding signal is transmitted to the lithium removal member 130, and the lithium removal member 130 works and removes the lithium ions on the surface of the substrate body 250, thereby achieving surface cleaning of the substrate body 250.

[0064] The principle of cooperation between the positioning member 120 and the lithium removal member 130 provided in this application is as follows:

[0065] There is a preset distance between the positioning member 120 and the lithium removal member 130 for the substrate 200 to be transported, and there is a preset time for the substrate 200 to be transported from the positioning member 120 to the lithium removal member 130 at a preset speed.

[0066] It is understandable that the preset distance is a fixed value, the preset time is a fixed value, and the preset speed needs to be a uniform speed, so as to ensure that the lithium removal member 130 reaches the position on time according to the preset time.

[0067] It should be noted that there is no limitation on the values ​​of the preset distance and the preset time, and they can be set according to actual conditions.

[0068] In this way, when the substrate 200 is transported at a preset speed and drives the lithium removal positions (points A and B) on the substrate 200 to be transported at a preset speed, the lithium removal member 130 is activated when the transport time of the lithium removal positions on the substrate 200 reaches the preset time, thereby removing lithium ions on the surface of the substrate body 250 between points A and B.

[0069] It should be noted that the above-mentioned points A and B are just example points.

[0070] Therefore, the electrode lithium replenishment device provided in this application can not only realize continuous lithium replenishment of the substrate, but also realize intermittent lithium replenishment of the substrate according to actual needs, and is compatible with continuous and intermittent lithium replenishment of the substrate to the greatest extent, thereby improving the scope of application of the substrate and being effectively applicable to various battery preparation processes such as winding and lamination.

[0071] In one possible implementation, referring to Figure 1 As shown, the lithium removal member 130 may include a first lithium removal member 131 and a second lithium removal member 132. A channel is formed between the first lithium removal member 131 and the second lithium removal member 132 for the substrate 200 to pass through. When the substrate 200 is located in the channel, the first lithium removal member 131 and the second lithium removal member 132 are respectively opposite to different surfaces of the substrate 200.

[0072] It can be understood that the first lithium removing member 131 and the second lithium removing member 132 are of the same type.

[0073] It should be noted that the different surfaces of the substrate 200 are the first lithium replenishing surface 230 and the second lithium replenishing surface 240 of the substrate body 250. In this way, lithium removal is performed from the first lithium replenishing surface 230 and the second lithium replenishing surface 240 respectively, effectively improving the removal efficiency.

[0074] It should be noted that the positions of the first lithium removing member 131 and the second lithium removing member 132 are not limited.

[0075] Exemplarily, the first lithium removal member 131 and the second lithium removal member 132 may be opposite to different surfaces of the substrate 200. For example, the first lithium removal member 131 and the second lithium removal member 132 are located at the same position, and the first lithium removal member 131 and the second lithium removal member 132 simultaneously start removing from both sides of point A until they reach both sides of point B.

[0076] For example, the first lithium removal member 131 and the second lithium removal member 132 may not be aligned with different surfaces of the substrate 200. For example, the first lithium removal member 131 and the second lithium removal member 132 may be located at different positions, with the first lithium removal member 131 located at point A and the second lithium removal member 132 located at point B. The first lithium removal member 131 removes lithium from point A toward point B, while the second lithium removal member 132 removes lithium from point B toward point A. This is not limited in the present embodiment.

[0077] In one possible implementation, referring to Figure 1 As shown, the positioning member 120 may include a first positioning member 121 and a second positioning member 122, wherein a channel for the substrate 200 to pass through is formed between the first positioning member 121 and the second positioning member 122. When the substrate 200 is located in the channel, the first positioning member 121 and the second positioning member 122 are respectively opposite to different surfaces of the substrate 200.

[0078] It is understandable that the first positioning member 121 and the second positioning member 122 are of the same type. In this way, positioning is performed from the first lithium replenishing surface 230 and the second lithium replenishing surface 240 respectively, thereby improving the positioning effect.

[0079] It should be noted that the positions of the first positioning member 121 and the second positioning member 122 are not limited.

[0080] For example, the first positioning member 121 and the second positioning member 122 may face different surfaces of the substrate 200; or the first positioning member 121 and the second positioning member 122 may not face different surfaces of the substrate 200. This embodiment does not limit this.

[0081] In one possible implementation, referring to Figure 1As shown, the lithium replenishment component 110 may include a lithium replenishment housing 111 and a lithium replenishment source 113. The lithium replenishment housing 111 has a lithium replenishment chamber 112. The lithium replenishment source 113 is located in the lithium replenishment chamber 112 and is used to replenish lithium on the lithium replenishment surface of the substrate 200. The lithium replenishment source 113 may be an oxide, which is not limited in this embodiment. In this embodiment, the lithium replenishment chamber 112 contains an electrolyte 160 to facilitate the lithium replenishment process.

[0082] It should be noted that the electrolyte 160 is a carrier for ion transmission in the battery, generally composed of lithium salt and organic solvent. The electrolyte 160 plays the role of conducting ions between the positive and negative electrodes of the battery.

[0083] In the present application, refer to Figure 4 and Figure 5 As shown, the lithium replenishment source 113 may include a conductive backplate 116, an insulating layer 117, and a lithium metal layer 118, wherein the lithium metal layer 118 is located between the conductive backplate 116 and the insulating layer 117. Thus, the insulating layer 117 helps separate the lithium metal layer 118 from the substrate 200, thereby helping to prevent the lithium metal layer 118 and the substrate 200 from directly contacting each other and causing a short circuit, thereby improving battery safety. The lithium metal layer 118 is used to replenish lithium on the lithium replenishment surface of the substrate 200.

[0084] Conductive backplate 116 may be connected to a wire 114 for communicating with an external power source to energize substrate 200 and lithium replenishment source 113. Conductive support rods 115 may be connected to conductive backplate 116 for supporting wire 114, thereby improving the connection stability between wire 114 and conductive backplate 116.

[0085] In one possible implementation, referring to Figure 1 As shown, the number of lithium replenishing sources 113 can include multiple groups, and the multiple groups of lithium replenishing sources 113 are located at different positions in the lithium replenishing chamber 112. Along the transmission direction of the substrate 200, the multiple groups of lithium replenishing sources 113 are used to replenish lithium for the substrate 200 in sequence.

[0086] In the embodiment of the present application, there is no limitation on the number of lithium replenishing sources 113. For example, the number of lithium replenishing sources 113 can include two, three, or more groups. In this embodiment, two groups of lithium replenishing sources 113 are mainly used as an example for description.

[0087] In the embodiments of the present application, the specific locations of the two lithium replenishing sources 113 within the lithium replenishing chamber 112 are not limited. For example, the first lithium replenishing source 113 can be located on the left side of the lithium replenishing chamber 112, while the second lithium replenishing source 113 can be located on the right side of the lithium replenishing chamber 112. In this way, the first lithium replenishing source 113 can perform a primary lithium replenishment on the lithium replenishing surface of the substrate 200, while the second lithium replenishing source 113 can perform a secondary lithium replenishment on the lithium replenishing surface of the substrate 200, maximizing the lithium replenishment effect.

[0088] In one possible implementation, referring to Figure 1 As shown, each lithium replenishment source group 113 may include at least a first lithium replenishment source and a second lithium replenishment source. A channel is formed between the first lithium replenishment source and the second lithium replenishment source for the substrate 200 to pass through. When the substrate 200 is located in the channel, the first lithium replenishment source and the second lithium replenishment source are respectively opposite to different surfaces of the substrate 200.

[0089] It is understood that the first group of lithium replenishing sources includes the first lithium replenishing source and the second lithium replenishing source, and the second group of lithium replenishing sources includes the first lithium replenishing source and the second lithium replenishing source. In this way, the first lithium replenishing source and the second lithium replenishing source of the first group of lithium replenishing sources simultaneously replenish the lithium replenishing surface of the substrate 200 for the first time, and the first lithium replenishing source and the second lithium replenishing source of the second group of lithium replenishing sources replenish the lithium replenishing surface of the substrate 200 for the second time, thereby maximizing the lithium replenishing effect. For example, the metallic lithium 260 deposited on the empty foil substrate is as follows: Figure 4 and Figure 5 shown.

[0090] It should be noted that, in this embodiment, the number and arrangement of the lithium replenishing sources 113 include but are not limited to the above-mentioned methods, and can be specifically set according to actual conditions.

[0091] In one possible implementation, referring to Figure 1 As shown, a power supply 140 may also be included. Exemplarily, the power supply 140 may include a power supply 141 and a power supply circuit 142 .

[0092] The power supply 141 includes a first electrode and a second electrode. The electrical properties of the first electrode and the second electrode are opposite. For example, the first electrode may be a positive electrode and the second electrode may be a negative electrode, or vice versa. This embodiment does not limit this.

[0093] The first electrode is used to connect to the substrate 200, and the second electrode is connected to the lithium replenishment component 110, so that the electrode on the lithium replenishment surface of the substrate 200 and the electrode of the lithium replenishment component 110 are connected in series, thereby ensuring that an electric field is formed between the lithium replenishment component 110 and the substrate 200, thereby completing the lithium replenishment process.

[0094] In this embodiment, there is no limitation on the number of power supply members 140. For example, the number of power supply members 140 may include one, two or more. In this embodiment, two power supply members 140 are mainly used as an example for description. For example, refer to Figure 1 As shown, the two power supply components 140 can be connected to two groups of lithium replenishment sources 113 respectively, which helps to ensure continuous lithium replenishment and maximize the lithium replenishment efficiency.

[0095] In one possible implementation, referring to Figure 1 As shown, the substrate 200 may further include a wetting element 150, which is located upstream of the lithium replenishing element 110 along the transport direction of the substrate 200. Specifically, the wetting element 150 may include a wetting shell 151 filled with an electrolyte 160. This ensures that the lithium replenishing surface of the substrate 200 is fully wetted by the electrolyte 160 before lithium replenishment, thereby improving the lithium replenishment effect.

[0096] In the present application, refer to Figure 1 As shown, the electrode lithium replenishing device 100 may further include a transmission member 170 , which is located upstream of the immersion member 150 . The transmission member 170 is used to transmit the substrate 200 to be replenished with lithium and drive the substrate 200 to move along the transmission direction.

[0097] Among them, the transmission member 170 may include multiple transmission rollers 171 and conductive rollers 172. The transmission rollers 171 help provide driving force for the transmission of the substrate 200, thereby ensuring the normal transmission of the substrate 200. The conductive rollers 172 can ensure good conductivity during the lithium replenishment process and provide a current path for the substrate 200 during the electrochemical lithium replenishment process.

[0098] For example, there is no limitation on the number, location and arrangement of the conveying rollers 171 and the conductive rollers 172 , and they can be arranged according to actual needs.

[0099] In one possible implementation, referring to Figure 1 As shown, a cleaning element 180 may also be included. The cleaning element 180 is located downstream of the lithium replenishing element 110 along the conveying direction of the substrate 200. Specifically, the cleaning element 180 may include a cleaning housing 181 filled with a cleaning fluid 182. This facilitates removal of residual electrolyte 160 from the surface of the lithium replenished substrate 200 during the lithium replenishment process.

[0100] In one possible implementation, referring to Figure 1As shown, a drying assembly 190 may also be included. The drying assembly 190 is located downstream of the cleaning unit 180 along the conveying direction of the substrate 200. Specifically, the drying assembly 190 may include a drying housing 191 and a heating unit 192. The heating unit 192 is used to heat the cleaned substrate 200 to ensure that the substrate 200 is dry and clean.

[0101] For example, the heating element 192 may be a heating wire disposed on the inner wall of the drying housing 191, although this embodiment is not limited thereto. Furthermore, the drying housing 191 may be filled with an inert gas 193, such as nitrogen. This allows the lithium plated on the surface of the bare substrate 200 to react and generate inert Li3N, thereby ensuring safety during the Li3N removal process by the lithium removal element 130.

[0102] An embodiment of the present application provides a battery production device, including a pole piece lithium replenishing device.

[0103] It can be understood that the electrode lithium replenishing device is one of the devices in the battery production equipment. For example, in battery production, the battery production equipment can also include at least a liquid injection device, a cutting device, a battery drying device and other devices.

[0104] Since the battery production equipment in this embodiment includes the electrode lithium replenishing device described in any of the above embodiments, the structure and beneficial effects of the battery production equipment including the electrode lithium replenishing device will not be further described in this embodiment.

[0105] Therefore, the embodiment of the present application provides a pole piece lithium replenishment device and battery production equipment, including a positioning part and a lithium removal part. In this way, the positioning part can determine the lithium removal position on the substrate where lithium ions need to be removed according to actual needs, and the lithium removal part can remove the lithium ions plated on the lithium removal position during the lithium replenishment process. Therefore, while realizing continuous lithium replenishment of the substrate, the present application can also realize intermittent lithium replenishment of the substrate according to actual needs, and is compatible with continuous and intermittent lithium replenishment of the substrate to the greatest extent, thereby improving the scope of application of the substrate and being effectively applicable to various battery preparation processes such as winding and lamination.

[0106] It should be noted that, in the description of the embodiments of this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0107] In the description of the embodiments of the present application, the term "and / or" merely represents a type of association relationship describing associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" represents any combination of at least two of any one or more of a plurality of items. For example, at least one of A, B, and C may represent any one or more elements selected from a set including A, B, and C.

[0108] In the description of the embodiments of the present application, the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like indicate positions or location relationships based on the positions or location relationships shown in the accompanying drawings. These terms are intended only to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present application. Furthermore, the term "plurality" means two or more, unless otherwise specifically specified.

[0109] In the description of the embodiments of the present application, the terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pole piece lithium replenishing device, characterized in that: Used to replenish lithium for the substrate, the electrode lithium replenishing device includes: A lithium replenishing member (110), wherein the lithium replenishing member (110) is used to replenish lithium on the lithium replenishing surface of the substrate (200); A positioning member (120), wherein the positioning member (120) is used to determine a delithiation position on the substrate (200) where lithium ions need to be removed; A lithium removal member (130), wherein the lithium replenishing member (110) and the positioning member (120) are located upstream of the lithium removal member (130) along the transport direction of the substrate (200); The positioning member (120) is electrically connected to the lithium removal member (130), and the positioning member (120) sends the determined lithium removal position to the lithium removal member (130); There is a preset distance between the positioning member (120) and the lithium removal member (130) for the substrate (200) to be transported, and the substrate (200) has a preset time to be transported from the positioning member (120) to the position of the lithium removal member (130) at a preset speed; When the substrate (200) is transported at a preset speed and drives the lithium removal position on the substrate (200) to be transported at the preset speed, the lithium removal member (130) is used to start when the transport time of the lithium removal position on the substrate (200) reaches the preset time.

2. The electrode lithium replenishing device according to claim 1, characterized in that: The lithium removal member (130) includes a first lithium removal member (131) and a second lithium removal member (132); A channel for the substrate (200) to pass through is formed between the first lithium removal member (131) and the second lithium removal member (132). When the substrate (200) is located in the channel, the first lithium removal member (131) and the second lithium removal member (132) are respectively opposite to different surfaces of the substrate (200).

3. The electrode lithium replenishing device according to claim 2, characterized in that: The positioning member (120) includes a first positioning member (121) and a second positioning member (122); A channel for the substrate (200) to pass through is formed between the first positioning member (121) and the second positioning member (122); when the substrate (200) is located in the channel, the first positioning member (121) and the second positioning member (122) are respectively opposite to different surfaces of the substrate (200).

4. The electrode lithium replenishing device according to any one of claims 1 to 3, characterized in that: The lithium replenishment component (110) comprises a lithium replenishment housing (111) and a lithium replenishment source (113); the lithium replenishment housing (111) has a lithium replenishment cavity (112); the lithium replenishment source (113) is located in the lithium replenishment cavity (112); and the lithium replenishment source (113) is used to replenish lithium on the lithium replenishment surface of the substrate (200).

5. The electrode lithium replenishing device according to claim 4, characterized in that: The lithium replenishing sources (113) include a plurality of groups, and the plurality of groups of lithium replenishing sources (113) are located at different positions in the lithium replenishing chamber (112). Along the transmission direction of the substrate (200), the plurality of groups of lithium replenishing sources (113) are used to replenish lithium to the substrate (200) in sequence.

6. The electrode lithium replenishing device according to claim 5, characterized in that: Each group of lithium replenishing sources (113) includes at least a first lithium replenishing source and a second lithium replenishing source; A channel for the substrate (200) to pass through is formed between the first lithium replenishing source and the second lithium replenishing source. When the substrate (200) is located in the channel, the first lithium replenishing source and the second lithium replenishing source are respectively opposite to different surfaces of the substrate (200).

7. The electrode lithium replenishing device according to any one of claims 1 to 3, characterized in that: Also included is a power supply member (140), the power supply member (140) including a first electrode and a second electrode, the first electrode and the second electrode having opposite electrical properties; The first electrode is used to connect to the substrate (200), and the second electrode is connected to the lithium supplement component (110).

8. The electrode lithium replenishing device according to any one of claims 1 to 3, characterized in that: It also includes an impregnation member (150), which is located upstream of the lithium replenishing member (110) along the transmission direction of the substrate (200); The electrode lithium replenishment device further comprises a transmission component (170), the transmission component (170) being located upstream of the impregnation component (150), the transmission component (170) being used to transmit the substrate (200) to be replenished with lithium and driving the substrate (200) to move along the transmission direction.

9. The electrode lithium replenishing device according to any one of claims 1 to 3, characterized in that: It also includes a cleaning component (180), which is located downstream of the lithium replenishing component (110) along the transmission direction of the substrate (200).

10. The electrode lithium replenishing device according to claim 9, characterized in that: It also includes a drying component (190), which is located downstream of the cleaning component (180) along the conveying direction of the substrate (200).

11. The electrode lithium replenishing device according to claim 10, characterized in that: The drying assembly (190) comprises a drying shell (191) and a heating element (192), wherein the heating element (192) is used to heat the cleaned substrate (200); The drying shell (191) is filled with inert gas (193).

12. A battery production device comprising the electrode lithium replenishing device according to any one of claims 1 to 11.

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