Pole piece stress adjustment device

Abstract

The utility model discloses a kind of pole piece stress adjusting devices, comprising: at least two electrically conductive contact components, it is configured to be able to from the opposite sides of pole piece contact and hold pole piece oppositely;Pulse generating mechanism, with at least two electrically conductive contact components electrically connected;When pole piece is held by at least two electrically conductive contact components, pulse current is generated, the pulse current flows through at least two electrically conductive contact components and the pole piece held by them, forms closed pulse current loop.The current path of this kind of through type of the utility model makes that the electric plasticity effect generated by pulse current can act on the entire volume inside pole piece, increase the action area of pulse current, realize from material inside, fundamentally adjust stress.Different from annealing and other overall heat treatment process, pulse current acting time is extremely short, energy is concentrated, and production efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of battery electrode production technology, and in particular to an electrode stress adjustment device. Background Technology

[0002] Cycle life of power batteries is one of the key bottlenecks restricting their large-scale commercial application. Numerous studies have shown that the loss of active materials and active lithium are the two main causes of irreversible capacity decay in lithium-ion batteries. The loss of active materials mainly manifests as the breakage and pulverization of electrode particles during cycling, as well as the peeling of active material from the current collector. Behind these physical failure modes lies the cyclic internal stress (i.e., cycle stress) caused by the repeated insertion and extraction of lithium ions during charging and discharging. This stress leads to microcracks and structural damage in the electrode material, and continuously consumes active lithium to repair the solid-liquid interface film, ultimately causing a continuous decline in battery capacity.

[0003] To address these issues, existing technologies primarily intervene at two levels. First, at the electrode manufacturing process level, for example, annealing after rolling can eliminate work-hardening stress in the current collector, aiming to alleviate expansion stress during battery charging. However, this method prolongs the production cycle, reduces efficiency, and the high-temperature annealing process may adversely affect the structure and performance of the coated active materials. Second, at the battery system integration level, for example, by adding cushioning foam or mechanical expansion force regulating devices within the battery pack. While this method can effectively absorb the overall volume expansion of the battery and reduce stress on the battery pack frame, the external cushioning device cannot effectively conduct and counteract the micro-stress generated inside the electrode due to the tight constraint of the rigid outer shell within the individual cell, thus only addressing the symptoms, not the root cause.

[0004] Therefore, there is an urgent need in the field for a new device that can directly act on the electrode itself, regulate its internal stress from the source, and not affect production efficiency and material properties. Utility Model Content

[0005] This invention proposes an electrode stress adjustment device to solve the above-mentioned problems.

[0006] In a first aspect, embodiments of this utility model disclose an electrode stress adjustment device, comprising:

[0007] At least two conductive contact components are configured to contact and clamp the electrode from opposite sides of the electrode.

[0008] A pulse generating mechanism is electrically connected to at least two conductive contact components; wherein the pulse generating mechanism is configured to generate a pulse current when the electrode is clamped by the at least two conductive contact components, the pulse current flowing through the at least two conductive contact components and the electrode they clamp to form a closed pulse current loop.

[0009] By employing the above technical solution, the electrode stress adjustment device provided in this embodiment clamps and contacts the electrode through at least two opposing conductive contact components. This through-type current path allows the electroplastic effect generated by the pulse current to act throughout the entire volume of the electrode, increasing the effective area of ​​the pulse current and fundamentally adjusting the stress from within the material. Unlike overall heat treatment processes such as annealing, the pulse current has an extremely short duration and concentrated energy, greatly improving production efficiency.

[0010] According to another specific embodiment of the present invention, the conductive contact component includes a first clamping component and a second clamping component. The first clamping component is located below the electrode sheet, and the second clamping component is located above the electrode sheet. The positions of the first clamping component and the second clamping component correspond to form a space for clamping the electrode sheet.

[0011] According to another specific embodiment of the present invention, the first clamping assembly includes:

[0012] The first conductive shaft is configured to be electrically connected to the pulse generating mechanism, serving as the input or output shaft of the pulse current;

[0013] The first conductive bearing roller is rotatably sleeved on the outer periphery of the first conductive shaft, and the outer circumferential surface of the first conductive bearing roller is used to contact and transmit the electrode sheet;

[0014] The first roller support frame includes a base and two first connecting plates fixed on the base and arranged opposite each other. The two first connecting plates define an installation space for the first conductive bearing roller. The two ends of the first conductive shaft are respectively fixed to the first connecting plates, and the first roller support frame is insulated from the first conductive shaft and / or the first conductive bearing roller.

[0015] According to another specific embodiment of the present invention, at least one first connecting plate has a mounting hole for the first conductive shaft to pass through to the outside of the mounting space; the first clamping assembly further includes: a first insulating bushing, coaxially disposed in the annular gap between the outer periphery of the first conductive shaft and the mounting hole, for insulating the first conductive shaft from the first roller support frame; and / or at least one stop bearing, sleeved on the outer periphery of the first conductive shaft and located between the first conductive bearing roller and the first connecting plate, for limiting the axial displacement of the first conductive bearing roller relative to the first conductive shaft.

[0016] According to another specific embodiment of the present invention, the second clamping assembly includes:

[0017] The second conductive shaft is configured to be electrically connected to the pulse generating mechanism, serving as the input or output shaft of the pulse current;

[0018] The second conductive bearing roller is rotatably sleeved on the outer circumference of the second conductive shaft, and the outer circumferential surface of the second conductive bearing roller is used to contact and transmit the electrode sheet;

[0019] The second roller support frame includes an upper seat and two second connecting plates fixed on the upper seat and arranged opposite each other. The two second connecting plates define the installation space of the second conductive bearing roller. The two ends of the second conductive shaft are respectively fixed to the second connecting plates. The second roller support frame is insulated from the second conductive shaft and / or the second conductive bearing roller.

[0020] According to another specific embodiment of the present invention, at least one second connecting plate has a mounting hole for the second conductive shaft to pass through to the outside of the mounting space;

[0021] The second clamping assembly further includes: a second insulating bushing, coaxially disposed within the annular gap between the outer periphery of the second conductive shaft and the mounting hole, for insulating the second conductive shaft from the second roller support frame; and / or at least two stop bearings, sleeved on the outer periphery of the second conductive shaft and located between the second conductive bearing roller and the second connecting plate, for limiting the axial displacement of the second conductive bearing roller relative to the second conductive shaft.

[0022] According to another specific embodiment of the present invention, it further includes a driving mechanism, which is configured to drive the first clamping component and the second clamping component to generate relative movement, so as to adjust the magnitude of the clamping force of the first clamping component and / or the second clamping component on the electrode sheet.

[0023] According to another specific embodiment of the present invention, a spring is also included, which is fixed to the top surface of the upper seat. The pressure of the second conductive bearing roller on the electrode is adjusted by changing the deformation of the spring.

[0024] According to another specific embodiment of the present invention, it further includes: a sliding frame, which is slidably connected to the upper seat, the sliding frame and the top surface of the upper seat defining the installation space of the spring, and the end of the spring away from the top surface of the upper seat is fixed to the sliding frame.

[0025] According to another specific embodiment of the present invention, it further includes: two limiting shafts, which are respectively fixed on opposite sides of the upper seat and arranged parallel to the second conductive shaft; the sliding frame is provided with strip grooves corresponding to the positions of the two limiting shafts, and the two limiting shafts are respectively located in the strip grooves. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the electrode stress adjustment device in the embodiment of this utility model;

[0027] Figure 2 This is a top view schematic diagram of the electrode stress adjustment device in the embodiment of this utility model;

[0028] Figure 3 This is a three-dimensional structural diagram of the electrode stress adjustment device in the embodiment of this utility model;

[0029] Figure 4 This is a three-dimensional structural diagram of the first clamping component in an embodiment of the present utility model;

[0030] Figure 5 This is a two-dimensional structural diagram of the first clamping component in an embodiment of the present utility model;

[0031] Figure 6 This is a three-dimensional structural diagram of the second clamping component in an embodiment of the present utility model;

[0032] Figure 7 This is a two-dimensional structural diagram of the second clamping component in an embodiment of the present invention.

[0033] Figure Labels

[0034] Pulse generating mechanism 1; wire 11; conductive contact component 2; first clamping assembly 21; first conductive shaft 211; first conductive bearing roller 212; first roller support frame 213; base 2131; first connecting plate 2132; first insulating bushing 214; first stop bearing 215; second clamping assembly 22; second conductive shaft 221; first conductive bearing roller 222; first roller support frame 223; upper seat 2231; second connecting plate 2232; first insulating bushing 224; first stop bearing 225; electrode 3; spring 4; sliding frame 5; strip groove 51; strip groove 51; limiting shaft 6; pressure roller 7. Detailed Implementation

[0035] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0036] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0040] Firstly, reference Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of this utility model discloses an electrode stress adjustment device, comprising: a pulse generating mechanism 1 and at least two conductive contact components 2, which are configured to contact and clamp the electrode 3 from opposite sides; the pulse generating mechanism 1 is electrically connected to the at least two conductive contact components 2; the pulse generating mechanism 1 is configured to generate a pulse current when the electrode 3 is clamped by the at least two conductive contact components 2. Figure 2 The dashed line in the middle indicates the pulse current flowing through the electrode 3. This pulse current flows through at least two conductive contact parts 2 and the electrode 3 they hold, forming a closed pulse current loop.

[0041] In the manner described above, the electrode stress adjustment device provided in this embodiment clamps and contacts the electrode 3 through at least two conductive contact components 2 facing each other. This through-type current path allows the electroplastic effect generated by the pulse current to act on the entire volume of the electrode 3, increasing the effective area of ​​the pulse current and realizing stress adjustment from the inside of the material.

[0042] By applying a certain clamping force through opposing contact, the current circuit is highly controllable, preventing safety issues such as short circuits or discharge interruptions that may be caused by the loosening or detachment of electrode 3. At the instant that a high-energy pulse current passes through, the material may undergo slight instantaneous deformation due to thermal and electro-shrinkage effects. The clamping force can constrain this deformation, preventing electrode 3 from wrinkling, bending, or shifting, thus avoiding the introduction of new physical damage.

[0043] Unlike overall heat treatment processes such as annealing, pulsed current has an extremely short duration and concentrated energy, enabling stress regulation without significantly increasing the overall temperature of electrode 3, thus better preserving the original chemical and physical properties of the electrode. In this embodiment, the pulsed current acts only on the metal current collector portion of electrode 3, not on the coating portion. Current always tends to flow along the path of least resistance (highest conductivity), and the conductivity of the metal current collector (copper / aluminum) is much higher than that of the coating; therefore, the effect of the pulsed current on the coating is negligible.

[0044] Furthermore, this device can be integrated into the rolling process (such as as a stand-alone station) as an independent station in the electrode manufacturing process. Figure 3 In this process, after rolling the electrode sheet with pressure rollers while simultaneously adjusting the stress online, and slitting, the electrode sheet 3 is processed online. The entire process is extremely short (pulse discharge is typically in the millisecond or microsecond range), hardly increasing the production cycle time, significantly outperforming the time-consuming annealing process, and greatly improving production efficiency. Furthermore, the electrode stress adjustment device provided in this embodiment does not require adding any additional buffer or adjustment mechanisms inside the battery pack or cell, and does not alter the existing cell structure design and packaging process. It effectively solves the industry problem of the inability to release internal stress of the electrode sheet 3 under the constraint of the cell casing, making it easy to promote and apply.

[0045] In the above embodiment, the conductive contact component 2 includes a first clamping component 21 and a second clamping component 22. The first clamping component 21 is located below the electrode 3, and the second clamping component 22 is located above the electrode 3. The positions of the first clamping component 21 and the second clamping component 22 correspond to form a space for clamping the electrode 3.

[0046] Through the above-described method, the top-to-bottom opposing design of the first clamping assembly 21 and the second clamping assembly 22 forms a stable clamping space, ensuring that the electrode 3 is uniformly clamped during transmission and processing, and that current can flow synchronously from both sides, thus improving the uniformity and consistency of stress adjustment. This layout also facilitates integration into continuous production lines and supports dynamic processing of the electrode.

[0047] In the above embodiments, such as Figure 4 , Figure 5As shown, the first clamping assembly 21 includes: a first conductive shaft 211, a first conductive bearing roller 212, and a first roller support frame 213. The first conductive shaft 211 is configured to be electrically connected to the pulse generating mechanism 1, serving as an input shaft or output shaft for the pulse current. The first conductive bearing roller 212 is rotatably sleeved on the outer circumference of the first conductive shaft 211, and the outer circumferential surface of the first conductive bearing roller 212 is used to contact and transmit the electrode 3. The first roller support frame 213 includes a base 2131 and two first connecting plates 2132 fixed on the base 2131 and arranged opposite to each other. The two first connecting plates 2132 define the installation space of the first conductive bearing roller 212. The two ends of the first conductive shaft 211 are respectively fixed to the first connecting plates 2132, and the first roller support frame 213 is insulated from the first conductive shaft 211 and / or the first conductive bearing roller 212.

[0048] In this manner, the first conductive shaft 211 serves as the core for current conduction, ensuring efficient input of pulsed current to or output from the electrode 3. The rotatable design of the first conductive bearing roller 212 reduces frictional resistance with the electrode 3, allowing the electrode 3 to be processed during continuous transmission, balancing efficiency and contact quality. The first roller support frame 213 provides rigid support through the base 2131 and the first connecting plate 2132, and its insulation design prevents current bypass, improving safety and current utilization efficiency. The overall structure is compact and easy to install and maintain.

[0049] In the above embodiments, at least one first connecting plate 2132 has a mounting hole through which the first conductive shaft 211 passes to the outside of the mounting space; the first clamping assembly 21 further includes: a first insulating bushing 214, which is coaxially disposed in the annular gap between the outer periphery of the first conductive shaft 211 and the mounting hole, for insulating the first conductive shaft 211 from the first roller support frame 213.

[0050] In this manner, the first insulating bushing 214 effectively isolates the electrical connection between the first conductive shaft 211 and the first roller support frame 213, preventing short circuits or leakage caused by insulation failure, and enhancing the reliability and operational safety of the device. At the same time, the bushing structure simplifies the assembly process and improves the accuracy and stability of assembly.

[0051] In some implementations, such as Figure 5 As shown, the first clamping assembly 21 also includes at least one stop bearing 215, which is sleeved on the outer periphery of the first conductive shaft 211 and located between the first conductive bearing roller 212 and the first connecting plate 2132, for limiting the axial displacement of the first conductive bearing roller 212 relative to the first conductive shaft 211.

[0052] In this manner, the first stop bearing 215 constrains the axial movement of the first conductive bearing roller 212, ensuring that the roller remains stable under high-speed rotation or load changes, and avoiding poor contact or scratches on the electrode 3 caused by axial movement. This improves clamping accuracy and the continuity of current conduction, and extends the service life of the component. In this embodiment, the first stop bearing 215 is provided on both sides of the first conductive bearing roller 212.

[0053] In the above embodiments, such as Figure 6 , Figure 7 As shown, the second clamping assembly 22 includes: a second conductive shaft 221, a second conductive bearing roller 222, and a second roller support frame 223. The second conductive shaft 221 is configured to be electrically connected to the pulse generating mechanism 1, serving as an input shaft or output shaft for the pulse current. The second conductive bearing roller 222 is rotatably sleeved on the outer circumference of the second conductive shaft 221, and the outer circumferential surface of the second conductive bearing roller 222 is used to contact and transmit the electrode 3. The second roller support frame 223 includes an upper seat 2231 and two second connecting plates 2232 fixed on the upper seat 2231 and arranged opposite to each other. The two second connecting plates 2232 define the installation space of the second conductive bearing roller 222. The two ends of the second conductive shaft 221 are respectively fixed to the second connecting plates 2232. The second roller support frame 223 is insulated from the second conductive shaft 221 and / or the second conductive bearing roller 222.

[0054] In this manner, the second clamping assembly 22 and the first clamping assembly 21 are symmetrically designed (excluding the spring 4, sliding frame 5, and limiting shaft 6), forming a coordinated clamping system. The second conductive shaft 221, as part of the current loop, ensures the pulse current flows completely through the electrode 3. The rotational characteristics of the second conductive bearing roller 222 reduce the transmission resistance of the electrode 3, while the upper seat 2231 of the second roller support frame 223 and the second connecting plate 2232 provide stable support, and the insulation design reduces the risk of current leakage. This structure optimizes the uniformity of stress adjustment and adapts to the needs of high-speed production lines.

[0055] In the above embodiments, when the first conductive shaft 211 serves as the input shaft of the pulse current, the second conductive shaft 221 serves as the output shaft of the pulse current, or when the first conductive shaft 211 serves as the output shaft of the pulse current, the second conductive shaft 221 serves as the input shaft of the pulse current. This utility model embodiment does not limit this.

[0056] In the above embodiments, both the first conductive bearing roller 212 and the second conductive bearing roller 222 are combinations of bearings and rollers. The inner ring of the bearing is fixed to the corresponding conductive shaft, and the roller is sleeved on the outer ring of the bearing. In some embodiments, the electrical connection between the conductive shaft and the roller and the rolling contact electrode 3 are not limited to the structure of a conductive bearing; this embodiment does not impose such limitations.

[0057] In the above embodiments, at least one second connecting plate 2232 has a mounting hole for the second conductive shaft 221 to pass through to the outside of the mounting space; the second clamping assembly 22 further includes: a second insulating bushing 224, coaxially disposed in the annular gap between the outer periphery of the second conductive shaft 221 and the mounting hole, for insulating the second conductive shaft 221 from the second roller support frame 223; and / or at least two stop bearings 225, sleeved on the outer periphery of the second conductive shaft 221 and located between the second conductive bearing roller 222 and the second connecting plate 2232, for limiting the axial displacement of the second conductive bearing roller 222 relative to the second conductive shaft 221.

[0058] In this manner, the second insulating bushing 224 ensures electrical isolation between the second conductive shaft 221 and the second roller support frame 223, improving overall insulation performance. The stop bearing 225 effectively controls the axial degree of freedom of the second conductive bearing roller 222, preventing it from shifting during operation and ensuring the stability of the contact surface of the electrode 3, thereby improving processing quality and device durability. The combined use of these components enhances the flexibility of modular design.

[0059] In the above embodiments, a driving mechanism is also included, which is configured to drive the first clamping component 21 and the second clamping component 22 to generate relative movement, so as to adjust the magnitude of the clamping force of the first clamping component 21 and / or the second clamping component 22 on the electrode 3.

[0060] In this manner, the drive mechanism allows for precise control of the clamping force, adapting to electrode sheets 3 of different thicknesses or materials, ensuring contact with the electrode sheet 3 without causing mechanical damage. This adjustability enhances the versatility and processing accuracy of the device, making it suitable for diverse production environments.

[0061] In some embodiments, the drive mechanism is configured to prevent relative movement between the first clamping assembly 21 and the second clamping assembly 22, but the clamping force of the first clamping assembly 21 and / or the second clamping assembly 22 on the electrode 3 can still be adjusted. The electrode stress adjustment device may also include a spring 4 fixed to the top surface of the upper seat 2231, and the pressure of the second conductive bearing roller 222 on the electrode 3 can be adjusted by changing the deformation of the spring 4.

[0062] In this way, spring 4 can automatically compensate for thickness fluctuations or surface unevenness of electrode 3, ensuring uniform pressure distribution. This passive adjustment mechanism simplifies drive requirements, reduces costs, and avoids deformation or damage to electrode 3 caused by overpressure, thereby improving processing consistency and reliability.

[0063] In the above embodiments, continue to refer to Figure 6 , Figure 7 The electrode stress adjustment device also includes a sliding frame 5, which is slidably connected to the upper seat 2231. The sliding frame 5 and the top surface of the upper seat 2231 define the installation space for the spring 4. The end of the spring 4 away from the top surface of the upper seat 2231 is fixed to the sliding frame 5. In this way, the sliding frame 5 serves as a support and adjustment carrier for the spring 4, facilitating preload adjustment and maintenance. Its sliding design allows for smooth vertical movement, ensuring sensitive clamping force response and optimizing the real-time contact of the electrode 3.

[0064] In the above embodiment, the electrode stress adjustment device further includes: two limiting shafts 6, respectively fixed on opposite sides of the upper seat 2231 and arranged parallel to the second conductive shaft 221; and strip grooves 51 are respectively provided on the sliding frame 5 corresponding to the positions of the two limiting shafts 6, with the two limiting shafts 6 located within the strip grooves 51. In this manner, the limiting shafts 6 and the strip grooves 51 constitute a guiding mechanism, constraining the movement trajectory of the sliding frame 5, preventing its rotation or lateral displacement, ensuring that the clamping force acts perpendicularly on the surface of the electrode 3, and improving the stability and accuracy of the clamping.

[0065] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A device for adjusting electrode stress, characterized in that, include: At least two conductive contact components are configured to contact and clamp the electrode from opposite sides of the electrode. A pulse generating mechanism is electrically connected to at least two of the aforementioned conductive contact components; wherein, The pulse generating mechanism is configured to generate a pulse current when the electrode is held by at least two of the conductive contact members. The pulse current flows through the at least two conductive contact members and the electrode they hold, forming a closed pulse current loop.

2. The electrode stress adjustment device according to claim 1, characterized in that, The conductive contact component includes a first clamping assembly and a second clamping assembly. The first clamping assembly is located below the electrode, and the second clamping assembly is located above the electrode. The positions of the first clamping assembly and the second clamping assembly correspond to form a space for clamping the electrode.

3. The electrode stress adjustment device according to claim 2, characterized in that, The first clamping component includes: The first conductive shaft is configured to be electrically connected to the pulse generating mechanism, serving as the input or output shaft of the pulse current; A first conductive bearing roller is rotatably sleeved on the outer periphery of the first conductive shaft, and the outer circumferential surface of the first conductive bearing roller is used to contact and transmit the electrode sheet; The first roller support frame includes a base and two first connecting plates fixed on the base and arranged opposite each other. The two first connecting plates define an installation space for the first conductive bearing roller. The two ends of the first conductive shaft are respectively fixed to the first connecting plates, and the first roller support frame is insulated from the first conductive shaft and / or the first conductive bearing roller.

4. The electrode stress adjustment device according to claim 3, characterized in that, At least one of the first connecting plates has a mounting hole through which the first conductive shaft extends to the outside of the mounting space; The first clamping component further includes: The first insulating bushing is coaxially disposed in the annular gap between the outer periphery of the first conductive shaft and the mounting hole, and is used to insulate the first conductive shaft from the first roller support frame. And / or at least one stop bearing, sleeved on the outer periphery of the first conductive shaft and located between the first conductive bearing roller and the first connecting plate, for limiting the axial displacement of the first conductive bearing roller relative to the first conductive shaft.

5. The electrode stress adjustment device according to claim 3, characterized in that, The second clamping assembly includes: The second conductive shaft is configured to be electrically connected to the pulse generating mechanism, serving as the input or output shaft of the pulse current; The second conductive bearing roller is rotatably sleeved on the outer periphery of the second conductive shaft, and the outer circumferential surface of the second conductive bearing roller is used to contact and transmit the electrode sheet; The second roller support frame includes an upper seat and two second connecting plates fixed to the upper seat and arranged opposite each other. The two second connecting plates define an installation space for the second conductive bearing roller. The two ends of the second conductive shaft are respectively fixed to the second connecting plates. The second roller support frame is insulated from the second conductive shaft and / or the second conductive bearing roller.

6. The electrode stress adjustment device according to claim 5, characterized in that, At least one of the second connecting plates has a mounting hole through which the second conductive shaft extends to the outside of the mounting space; The second clamping assembly further includes: The second insulating bushing is coaxially disposed in the annular gap between the outer periphery of the second conductive shaft and the mounting hole, and is used to insulate the second conductive shaft from the second roller support frame. And / or at least two stop bearings, sleeved on the outer periphery of the second conductive shaft and located between the second conductive bearing roller and the second connecting plate, are used to limit the axial displacement of the second conductive bearing roller relative to the second conductive shaft.

7. The electrode stress adjustment device according to any one of claims 2 to 6, characterized in that, It also includes a drive mechanism configured to drive the first clamping assembly and the second clamping assembly to generate relative movement, so as to adjust the magnitude of the clamping force of the first clamping assembly and / or the second clamping assembly on the electrode.

8. The electrode stress adjustment device according to claim 6, characterized in that, It also includes a spring, fixed to the top surface of the upper seat, and the pressure of the second conductive bearing roller on the electrode is adjusted by changing the deformation of the spring.

9. The electrode stress adjustment device according to claim 8, characterized in that, Also includes: A sliding frame is slidably connected to the upper seat. The sliding frame and the top surface of the upper seat define the installation space for the spring. One end of the spring away from the top surface of the upper seat is fixed to the sliding frame.

10. The electrode stress adjustment device according to claim 9, characterized in that, Also includes: Two limiting shafts are fixed to opposite sides of the upper seat and are arranged parallel to the second conductive shaft. The sliding frame has strip grooves corresponding to the positions of the two limiting shafts, and the two limiting shafts are located in the strip grooves.

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