Fixture, isostatic pressing apparatus, and battery production device

Abstract

The present application relates to the field of batteries, and provides a fixture, an isostatic pressing apparatus, and a battery production device. The fixture comprises at least two clamping plates and a pressure assembly. The clamping plates are stacked in a first direction, and a packaged electrode assembly is located between any two adjacent clamping plates. The pressure assembly is configured to apply pressure to the clamping plates in the first direction, so that any two adjacent clamping plates move close to each other. Each clamping plate comprises a support layer and a flexible layer stacked in the first direction, the flexible layer is located on at least one side of the support layer close to the packaged electrode assembly, and the hardness of the flexible layer is less than the hardness of the support layer. During isostatic pressing, a pressurizing medium pushes the clamping plates to apply pressure to the packaged electrode assembly to achieve densification processing. The support layer has relatively high hardness, enabling the clamping plate to possess certain hardness to apply pressure to the packaged electrode assembly; the packaged electrode assembly is in contact with the flexible layer, and the flexible layer has relatively low hardness, thereby reducing the possibility of damage to the packaged electrode assembly.

Description

Clamp, isostatic pressing device and battery production equipment

[0001] Cross-reference to related applications

[0002] This application is based on Chinese Patent Application No. 202422172726.5 entitled "Clamp, isostatic pressing device and battery production equipment" filed on September 5, 2024, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of battery technology, and in particular to a clamp, an isostatic pressing device and a battery production equipment. BACKGROUND

[0004] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0005] Solid-state batteries are a type of battery that uses solid electrodes and solid electrolytes. Isostatic pressing technology is one of the key technologies for preparing solid-state batteries. Isostatic pressing technology refers to the process of improving the performance and stability of solid-state batteries by applying static pressure. Typically, the electrode assembly is compacted under high pressure with uniform force. However, during the isostatic pressing process, the electrode assembly can be damaged.

[0006] SUMMARY

[0007] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a clamp, an isostatic pressing device and a battery production equipment, which reduces the possibility of damaging the electrode assembly.

[0008] Embodiments of the first aspect of the present application provide a clamp for clamping a packaged electrode assembly, the clamp comprising: at least two clamping plates stacked along a first direction, the first direction intersecting a surface of the clamping plate, the packaged electrode assembly being located between any two adjacent clamping plates; a pressure assembly configured to apply pressure to the clamping plates along the first direction to cause any two adjacent clamping plates to move closer to each other; wherein the clamping plate comprises a support layer and a flexible layer stacked along the first direction, the flexible layer being located on at least one side of the support layer closer to the packaged electrode assembly, the hardness of the flexible layer being less than the hardness of the support layer.

[0009] In the technical scheme of the embodiment of the present application, the clamping plate is used to clamp the packaged electrode assembly first, then the pressure assembly is controlled to exert pressure on the clamping plate, so that the clamping plate clamps the packaged electrode assembly, that is, the clamp provides pre-tightening force to the packaged electrode assembly, and then the clamp and the packaged electrode assembly are placed in the isostatic pressing cavity for isostatic pressing. In the process of isostatic pressing, the pressurizing medium pushes the clamping plates to move closer to each other, so that the clamping plates exert pressure on the packaged electrode assembly, and the densification treatment of the electrode assembly is realized. The hardness of the support layer is relatively large, so that the clamping plate has a certain hardness and can exert pressure on the packaged electrode assembly. The packaged electrode assembly is in contact with the flexible layer, and the hardness of the flexible layer is relatively small, which can reduce the possibility of the packaged electrode assembly being damaged.

[0010] In some embodiments, the material of the support layer includes one of aluminum, stainless steel and polytetrafluoroethylene, and / or the material of the flexible layer includes one of silica gel, rubber, polyethylene and polypropylene. Aluminum, stainless steel and polytetrafluoroethylene are relatively common materials with high hardness, and silica gel, rubber, polyethylene and polypropylene are relatively common materials with low hardness. Selecting the above materials as the materials of the support layer and the flexible layer respectively can reduce the cost.

[0011] In some embodiments, the clamp further includes a guide rod extending in the first direction, the guide rod penetrating through the clamping plate. The guide rod penetrating through the clamping plate is configured to control the movement of the clamping plate in the first direction.

[0012] In some embodiments, the pressure assembly includes a pressure plate located on at least one side of the clamping plate in the first direction, the guide rod penetrating through the pressure plate; a first elastic member located between the pressure plate and the clamping plate, the opposite ends of the first elastic member in the first direction being in abutment with the pressure plate and the clamping plate respectively; and an adjusting member located on the side of the pressure plate away from the clamping plate, the adjusting member being configured to adjust the distance between the pressure plate and the clamping plate in the first direction. When the clamp clamps packaged electrode assemblies of different models, the pre-tightening force provided by the clamp to the packaged electrode assemblies may not be the same. In the embodiment of the present application, the distance between the pressure plate and the clamping plate in the first direction can be adjusted by the adjusting member, so that the compression amount of the first elastic member changes, thereby changing the elastic force provided by the first elastic member to the clamping plate, and the pre-tightening force of the clamping plate to the packaged electrode assembly is adjusted.

[0013] In some embodiments, the pressure assembly further comprises: a baffle plate between the pressure plate and the adjusting member, the guide rod penetrating the baffle plate; a sliding rod extending in the first direction, one end of the sliding rod being in contact with the pressure plate, the other end of the sliding rod penetrating the baffle plate; a second elastic member between the pressure plate and the baffle plate, opposite ends of the second elastic member in the first direction being in contact with the pressure plate and the baffle plate respectively; wherein the adjusting member is slidably connected with the other end of the sliding rod, and the sliding direction of the adjusting member is the same as the first direction. The adjusting member slides on the sliding rod in the first direction, adjusts the distance between the pressure plate and the baffle plate, changes the compression amount of the second elastic member, changes the elastic force of the second elastic member on the pressure plate, changes the elastic force of the first elastic member on the pressure plate, changes the elastic force provided by the first elastic member on the clamping plate, and adjusts the pre-tightening force of the clamping plate on the packaged electrode assembly. The pre-tightening force of the clamping plate on the packaged electrode assembly is changed by multi-stage elastic force transmission, and the elastic force can be more uniformly transmitted to the next stage in the process of each stage of elastic force transmission, so that the pre-tightening force of the clamping plate on the packaged electrode assembly is more uniform.

[0014] In some embodiments, the pressure plate comprises: a first sub-pressure plate on one side of the clamping plate in the first direction, the guide rod penetrating the first sub-pressure plate; a second sub-pressure plate attached to the side of the first sub-pressure plate away from the clamping plate; wherein one end of the sliding rod is connected with the second sub-pressure plate. When the adjusting member slides on the sliding rod, assuming that the adjusting member moves towards the pressure plate, the adjusting member pushes the baffle plate to move towards the pressure plate, so that the distance between the pressure plate and the baffle plate decreases, the compression amount of the second elastic member changes, the elastic force of the second elastic member on the second sub-pressure plate increases, the second sub-pressure plate transmits the elastic force to the first sub-pressure plate, so that the elastic force of the first sub-pressure plate on the first elastic member increases, the elastic force provided by the first elastic member on the clamping plate increases, and the pressure of the clamping plate on the packaged electrode assembly increases. In the process of transmitting the elastic force from the second sub-pressure plate to the first sub-pressure plate, the entire surface of the second sub-pressure plate pushes the first sub-pressure plate, that is, the stress area of the first sub-pressure plate increases, so that the elastic force received by the first sub-pressure plate is more uniform, and the elastic force transmitted by the first sub-pressure plate to the clamping plate through the first elastic member is also more uniform, thereby making the pre-tightening force of the clamping plate on the packaged electrode assembly more uniform.

[0015] In some embodiments, the pressure assembly further comprises: a first limiting member connected with the guide rod, and the surface of the first sub-pressure plate away from the clamping plate is in contact with the first limiting member. The first elastic member pushes the first sub-pressure plate to move away from the clamping plate, and when the first sub-pressure plate moves to be in contact with the first limiting member, the first limiting member can limit the first sub-pressure plate from continuing to move, so that the first elastic member is always in a compressed state, and the clamping plate can continuously provide the pre-tightening force to the packaged electrode assembly.

[0016] In some embodiments, the pressure assembly further comprises a second limiting member connected to the guide rod, and the surface of the baffle plate away from the pressure plate abuts against the second limiting member. The second elastic member pushes the baffle plate to move away from the pressure plate, and when the baffle plate moves to abut against the second limiting member, the second limiting member can limit the baffle plate from continuing to move, so that the second elastic member is always in a compressed state, and the second elastic member can sequentially transmit elastic force to the clamping plate.

[0017] In some embodiments, the sliding rod has an external thread, and the adjusting member is threadedly connected to the sliding rod. The adjusting member is threadedly connected to the sliding rod, the distance between the baffle plate and the second sub-pressure plate is adjusted by screwing the adjusting member, which is more convenient, and can achieve stepless adjustment of the distance between the baffle plate and the second sub-pressure plate, that is, stepless adjustment of the pre-tightening force of the clamping plate on the packaged electrode assembly.

[0018] In some embodiments, the pressure assembly further comprises a gasket between the clamping plate and the first elastic member, and / or a gasket between the pressure plate and the first elastic member; wherein the guide rod penetrates the gasket. The two ends of the first elastic member abut against the pressure plate and the clamping plate, respectively, and the gasket is arranged between the clamping plate and the first elastic member and / or between the pressure plate and the first elastic member, which can reduce the extrusion of the first elastic member on the pressure plate and / or the clamping plate, and reduce the possibility of damage to the pressure plate and / or the clamping plate.

[0019] In some embodiments, the clamp comprises a plurality of guide rods, and the plurality of guide rods are arranged in a circumferential interval around the side edge of the clamping plate. The plurality of guide rods are arranged in a circumferential interval around the side edge of the clamping plate, which reduces the side bending of the clamping plate when moving along the guide rod, and the clamping plate moves more stably, and the pre-tightening force provided by the clamping plate on the packaged electrode assembly is more uniform.

[0020] In some embodiments, the clamp further comprises a base, the base and the pressure assembly are located on opposite sides of the clamping plate in the first direction, one end of the guide rod is connected to the base, and the other end of the guide rod is connected to the pressure assembly. The base provides support for the guide rod, so that the entire clamp is more stable.

[0021] In some embodiments, the clamp further comprises a pressure sensor connected to the base, and the clamping plate is in abutment with the pressure sensor. The force is reciprocal, and in the embodiments of the present application, the clamping plate provides pressure (i.e. pre-tightening force) to the packaged electrode assembly, and the packaged electrode assembly also provides pressure to the clamping plate, and the pressure on the two sides of the clamping plate is equal. Since the clamping plate is in abutment with the pressure sensor, the pressure detected by the pressure sensor can represent the pre-tightening force of the clamping plate to the packaged electrode assembly. The pressure sensor can be provided to monitor the pre-tightening force of the clamping plate to the packaged electrode assembly in real time, and when the pre-tightening force of the clamping plate to the packaged electrode assembly reaches a preset value, the clamping plate can be controlled to no longer increase the pre-tightening force applied to the packaged electrode assembly. Meanwhile, the pressure sensor is detachably connected to the base, and when hydrostatic pressing is performed, the pressure sensor can be detached to avoid damage to the pressure sensor during hydrostatic pressing.

[0022] In some embodiments, the side surface of the clamping plate facing the base has a transmission block, and the transmission block is in abutment with the pressure sensor. The transmission block in abutment with the pressure sensor can reduce the possibility of damage to the clamping plate caused by excessive pressure between the pressure sensor and the clamping plate.

[0023] The embodiments of the second aspect of the present application provide a hydrostatic pressing device, which comprises the clamp in the above embodiments.

[0024] The embodiments of the third aspect of the present application provide a battery production equipment, which comprises the hydrostatic pressing device in the above embodiments, and the hydrostatic pressing device is used for hydrostatic pressing treatment of the packaged electrode assembly.

[0025] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and to be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0026] In the drawings, the same reference signs will be used throughout the several views and identical or similar components or elements will be provided with the same reference signs, unless otherwise specified. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be considered as limiting the scope of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below, and obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any creative labor.

[0027] FIG. 1 is an exploded structural schematic view of a solid-state battery according to some embodiments of the present application;

[0028] Fig. 2 is a schematic diagram of a structure of an electrode assembly according to some embodiments of the present application;

[0029] Fig. 3 is a schematic diagram of a structure of a packaged electrode assembly according to some embodiments of the present application;

[0030] Fig. 4 is a schematic diagram of a structure of a clamp according to some embodiments of the present application;

[0031] Fig. 5 is a front view of a clamp according to some embodiments of the present application;

[0032] Fig. 6 is a schematic diagram of a cross section of a clamping plate cooperating with a packaged electrode assembly according to some embodiments of the present application;

[0033] Fig. 7 is a schematic diagram of a cross section of a clamping plate cooperating with a packaged electrode assembly according to some embodiments of the present application;

[0034] Fig. 8 is a schematic diagram of a structure of a part of a clamp according to some embodiments of the present application;

[0035] Fig. 9 is an exploded schematic diagram of a part of a clamp according to some embodiments of the present application. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0039] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" only describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0041] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0045] In the related art, in order to improve the densification performance of the solid-state battery, the solid-state battery is subjected to isostatic pressing. Specifically, after the electrode assembly of the solid-state battery is prepared, the electrode assembly can be subjected to isostatic pressing, and the electrode assembly is placed in an isostatic pressing environment to pressurize the electrode assembly. The pressure in the isostatic pressing environment is large, which is easy to crush the electrode assembly.

[0046] Based on the above considerations, in order to improve the problem that the electrode assembly is crushed during the isostatic pressing process, the embodiments of the present application improve a clamp for clamping the packaged electrode assembly, the clamp comprising at least two clamping plates and a pressure assembly. The at least two clamping plates are stacked along a first direction intersecting the surface of the clamping plate, and the packaged electrode assembly is located between any two adjacent clamping plates. The pressure assembly is configured to apply pressure to the clamping plate along the first direction to make any two adjacent clamping plates close to each other. The clamping plate comprises a support layer and a flexible layer stacked along the first direction, the flexible layer is located on at least one side of the support layer close to the packaged electrode assembly, and the hardness of the flexible layer is less than that of the support layer. First, use the clamping plate to clamp the packaged electrode assembly, then control the pressure assembly to apply pressure to the clamping plate, so that the clamping plate clamps the packaged electrode assembly, that is, the clamp provides a pre-tightening force to the packaged electrode assembly, and then places the clamp and the packaged electrode assembly in the isostatic pressing cavity for isostatic pressing. During isostatic pressing, the pressurizing medium pushes the clamping plates to close to each other, so that the clamping plates apply pressure to the packaged electrode assembly to achieve densification of the electrode assembly. The hardness of the support layer is large, so that the clamping plate has a certain hardness and can apply pressure to the packaged electrode assembly. The packaged electrode assembly is in contact with the flexible layer, and the hardness of the flexible layer is small, which can reduce the possibility of the packaged electrode assembly being crushed.

[0047] The solid-state battery and the electrode assembly disclosed by the embodiments of the present application can be used in, but are not limited to, electric devices such as vehicles, ships or aircraft. The power supply system of the electric device can be composed of the battery monomer and the battery disclosed by the present application.

[0048] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0049] Please refer to FIG. 1, which is an exploded structural schematic diagram of a solid-state battery provided by some embodiments of the present application. The solid-state battery 300 comprises a box body 60 and a battery monomer 70, and the battery monomer 70 is contained in the box body 60. The box body 60 is used to provide a containing space for the battery monomer 70, and the box body 60 can adopt various structures. In some embodiments, the box body 60 can comprise a first part 61 and a second part 62, the first part 61 and the second part 62 are overlapped with each other, and the first part 61 and the second part 62 jointly define a containing space for containing the battery monomer 70.

[0050] In the solid-state battery 300, the battery cell 70 can be multiple, and the multiple battery cells 70 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 70 are connected in series and in parallel. The multiple battery cells 70 can be directly connected in series or in parallel or in a mixed manner, and then the multiple battery cells 70 are accommodated in the box 60 as a whole. Of course, the solid-state battery 300 can also be in the form of a battery module in which the multiple battery cells 70 are connected in series or in parallel or in a mixed manner, and then the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the box 60. The solid-state battery 300 can also include other structures, for example, the solid-state battery 300 can also include a current collecting component for realizing electrical connection between the multiple battery cells 70.

[0051] The battery cell refers to the smallest unit of the battery, and the battery cell includes an end cover, a shell, an electrode assembly, and other functional components. The electrode assembly is a component in which an electrochemical reaction occurs in the battery cell. The shell can contain one or more electrode assemblies.

[0052] As shown in FIG. 2, which is a structural schematic diagram of an electrode assembly according to some embodiments of the present application. The electrode assembly 80 can include a positive electrode sheet, a negative electrode sheet, and a solid electrolyte located between the positive electrode sheet and the negative electrode sheet, for forming an ion channel between the positive electrode sheet and the negative electrode sheet, to ensure the transmission and reaction of positive and negative ions. The material of the solid electrolyte can include oxide, phosphate, silicate, nitride, or sulfide, etc. The positive electrode sheet, the negative electrode sheet, and the solid electrolyte sandwiched between the positive electrode sheet and the negative electrode sheet are wound or stacked to form the electrode assembly. The electrode assembly shown in FIG. 2 is formed by stacking the positive electrode sheet, the negative electrode sheet, and the solid electrolyte. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body part 81 of the electrode assembly, and a portion without active material constituting a tab 82. The tab 82 can be located at one end of the main body part or at both ends of the main body part 81. The shape of the electrode assembly 80 can be a cuboid, a cylinder, or the like.

[0053] FIG. 3 is a structural schematic diagram of a packaged electrode assembly according to some embodiments of the present application. In combination with FIG. 2 and FIG. 3, the surface of the electrode assembly 80 is coated with a packaging film 90 to form a packaged electrode assembly 200.

[0054] Exemplarily, the packaging film 90 can be one of an aluminum-plastic film, a polyethylene film, and a polypropylene film. The thickness of the packaging film 90 is greater than or equal to 50 micrometers (μm) and less than or equal to 500 μm, and exemplarily, the thickness of the packaging film 90 is 300 μm.

[0055] An embodiment of the present application provides a clamp, and FIG. 4 is a structural schematic diagram of a clamp according to some embodiments of the present application.

[0056] FIG. 5 is a front view of the clamp according to some embodiments of the present application. In order to show the positional relationship between the clamp 100 and the encapsulated electrode assembly 200, the encapsulated electrode assembly 200 is also shown in FIG. 5. Referring to FIGS. 4 and 5, the clamp 100 is used to clamp the encapsulated electrode assembly 200, and the clamp 100 includes at least two clamping plates 10 and a pressure assembly 20. The at least two clamping plates 10 are stacked along a first direction X, the first direction X intersects the surface of the clamping plate 10, and the encapsulated electrode assembly 200 is located between any two adjacent clamping plates 10. The pressure assembly 20 is configured to apply pressure to the clamping plates 10 along the first direction X so that any two adjacent clamping plates 10 are close to each other.

[0057] FIG. 6 is a cross-sectional view of the clamping plate cooperating with the encapsulated electrode assembly according to some embodiments of the present application. FIG. 7 is a cross-sectional view of the clamping plate cooperating with the encapsulated electrode assembly according to some other embodiments of the present application. Referring to FIGS. 6 and 7, the clamping plate 10 includes a support layer 11 and a flexible layer 12 stacked along the first direction X, the flexible layer 12 is located on at least one side of the support layer 11 close to the encapsulated electrode assembly 200, and the hardness of the flexible layer 12 is less than the hardness of the support layer 11.

[0058] The encapsulation film 90 wraps the electrode assembly 80 to form the encapsulated electrode assembly 200. During the isostatic pressing process, the encapsulation film 90 can isolate the electrode assembly 80 from the external environment, reduce the possibility of external impurities contacting the electrode assembly 80, and reduce the possibility of the electrode assembly 80 being contaminated. Referring to FIG. 3, the encapsulation film 90 has a punched region 91 and an encapsulation region 92, the encapsulation region 92 surrounds the punched region 91, and the electrode assembly 80 is located in the punched region 91.

[0059] Exemplarily, the method for obtaining the encapsulated electrode assembly 200 by the encapsulation film 90 and the electrode assembly 80 can include the following steps.

[0060] Step one, obtaining an untreated encapsulation film. The untreated encapsulation film is a flat film, and the untreated encapsulation film can be divided into a first sub-portion and a second sub-portion adjacent to each other.

[0061] Step two, punching on the first sub-portion to form the punched region 91. The first sub-portion outside the periphery of the punched region 91 is an edge region, and the punched region 91 is recessed compared to the edge region to accommodate the electrode assembly 80. The edge region can be arranged around the punched region 91, and the edge region includes a first edge region, a second edge region, a third edge region, and a fourth edge region connected in sequence, wherein the second edge region is adjacent to the second sub-portion, and the fourth edge region is located on the side of the punched region away from the second sub-portion. A conventional punching machine can be used to punch the first sub-portion. The size of the punched region 91 is related to the size of the electrode assembly 80 to be encapsulated.

[0062] Step three, placing the electrode assembly 80 in the punched region 91.

[0063] Step four, fold the second sub-portion onto the first sub-portion to cover the entire electrode assembly 80 and the edge sealing area. The second sub-portion and the first edge sealing area, the second edge sealing area, the third edge sealing area are sealed, and a gap is left between the remaining fourth edge sealing area and the second sub-portion to form the air extraction opening.

[0064] Step five, use a vacuum packaging machine to extract air from the inside of the packaging film 90 through the air extraction opening, so that a negative pressure is formed in the pit area 91, and the inside of the packaging film 90 has a certain degree of vacuum.

[0065] Step six, seal the remaining fourth edge sealing area and the second sub-portion to seal the air extraction opening. In some embodiments, any one of heat sealing, ultrasonic welding or laser welding can be used to seal the remaining fourth edge sealing area and the second sub-portion.

[0066] In some embodiments of the present application, referring to FIG. 6, the clamp 100 can include two clamping plates 10, and the packaged electrode assembly 200 is located between the two clamping plates 10, at this time, one side of the support layer 11 along the first direction X has a flexible layer 12.

[0067] In other embodiments of the present application, referring to FIG. 7, the clamp 100 can include a larger number of clamping plates 10, and the packaged electrode assembly 200 is located between any two adjacent clamping plates 10, that is, one clamp 100 can clamp multiple packaged electrode assemblies 200. Among them, for the two clamping plates 10 located at the ends of the plurality of clamping plates 10, one side of the support layer 11 along the first direction X has a flexible layer 12; for the clamping plates 10 located in the middle of the plurality of clamping plates 10, the opposite sides of the support layer 11 along the first direction X both have a flexible layer 12.

[0068] In embodiments of the present application, the first direction X is perpendicular to the surface of the clamping plate 10. Alternatively, the first direction X has a component perpendicular to the surface of the clamping plate 10, for example, the first direction X has an angle between 80° and 90° with the surface of the clamping plate 10.

[0069] In embodiments of the present application, the pressure assembly 20 applies pressure to the clamping plate 10 along the first direction X, so that any two adjacent clamping plates 10 are close to each other, and the clamping plate 10 applies pressure to the packaged electrode assembly 200, that is, the clamping plate 10 applies a pre-tightening force to the packaged electrode assembly 200.

[0070] In embodiments of the present application, the Brinell hardness of the support layer 11 is greater than or equal to 50 HB and less than or equal to 200 HB, and the Brinell hardness of the support layer 11 can be measured according to GB / T231.1-2018.

[0071] The Shore hardness of the flexible layer 12 is greater than or equal to 10HA and less than or equal to 90HA, and the Shore hardness of the flexible layer 12 can be measured by a Shore hardness tester.

[0072] In the embodiments of the present application, the clamping plate 10 is first used to clamp the packaged electrode assembly 200, and then the pressure assembly 20 is controlled to apply pressure to the clamping plate 10, so that the clamping plate 10 clamps the packaged electrode assembly 200, that is, the clamp 100 provides a pre-tightening force to the packaged electrode assembly 200, and then the clamp 100 and the packaged electrode assembly 200 are placed in an isostatic pressing cavity for isostatic pressing. During isostatic pressing, the pressurizing medium pushes the clamping plates 10 to move closer to each other, so that the clamping plates 10 apply pressure to the packaged electrode assembly 200, achieving densification treatment of the electrode assembly. The hardness of the support layer 11 is relatively large, so that the clamping plate 10 has a certain hardness and can apply pressure to the packaged electrode assembly 200. The packaged electrode assembly 200 is in contact with the flexible layer 12, and the hardness of the flexible layer 12 is relatively small, which can reduce the possibility of the packaged electrode assembly 200 being damaged.

[0073] At the same time, during isostatic pressing, the clamping plate 10 has a pre-tightening force to the packaged electrode assembly 200, which reduces the movement of the packaged electrode assembly 200 and improves the stability of the packaged electrode assembly 200. At the same time, the clamping plate 10 clamps the packaging film on the surface of the packaged electrode assembly 200, so that even if the packaging film deforms, the clamping plate 10 can reduce the transmission of the deformation of the packaging film to the electrode assembly, reduce the influence of the deformation of the packaging film on the electrode assembly, improve the stability of the electrode assembly, and the densification effect of the electrode assembly is better.

[0074] In the related art, the packaged electrode assembly is generally directly placed in an isostatic pressing cavity for isostatic pressing treatment. In the current electrode assembly, the anode tab exceeds the cathode tab in the width direction and the length direction to a certain extent, so as to avoid too many lithium ions, which are active material of the cathode tab, from being discharged during charging and being unable to completely insert into the active material of the anode tab, thereby causing lithium precipitation on the surface of the anode tab and bringing safety risks. The area where the anode tab exceeds the cathode tab in the width direction and the length direction is referred to as Overhang. During the densification treatment of the electrode assembly, the tab and the anode tab at the Overhang are prone to be broken, causing damage to the electrode assembly. In the clamp 100 provided in the embodiments of the present application, the clamping plate 10 is used to pressurize the packaged electrode assembly 200, and during subsequent isostatic pressing, the clamping plate 10 mainly applies pressure to the middle part of the packaged electrode assembly 200. The pressure of the clamping plate 10 on the edge of the electrode assembly and the tab is relatively small, which can reduce the possibility of damage to the anode tab and the tab and reduce the possibility of damage to the packaged electrode assembly 200.

[0075] According to some embodiments of the present application, the material of the support layer 11 comprises one of aluminum, stainless steel and polytetrafluoroethylene, and / or the material of the flexible layer 12 comprises one of silica gel, rubber, polyethylene and polypropylene.

[0076] In embodiments of the present application, the materials of the support layer 11 and the flexible layer 12 can be: the material of the support layer 11 comprises one of aluminum, stainless steel and polytetrafluoroethylene, and the hardness of the flexible layer 12 is lower than that of the support layer 11; the material of the flexible layer 12 comprises one of silica gel, rubber, polyethylene and polypropylene, and the hardness of the support layer 11 is higher than that of the flexible layer 12; or the material of the support layer 11 comprises one of aluminum, stainless steel and polytetrafluoroethylene, and the material of the flexible layer 12 comprises one of silica gel, rubber, polyethylene and polypropylene.

[0077] Exemplarily, the material of the support layer 11 comprises stainless steel, and the material of the flexible layer 12 comprises silica gel.

[0078] In embodiments of the present application, the support layer 11 and the flexible layer 12 can be bonded together.

[0079] Aluminum, stainless steel and polytetrafluoroethylene are relatively common materials with high hardness, and silica gel, rubber, polyethylene and polypropylene are relatively common materials with low hardness. Selecting the above materials as the materials of the support layer 11 and the flexible layer 12 can reduce the cost.

[0080] According to some embodiments of the present application, referring to FIG. 4 and FIG. 5, the clamp 100 further comprises a guide rod 30, the guide rod 30 extends along the first direction X, and the guide rod 30 penetrates the clamping plate 10.

[0081] In embodiments of the present application, the clamp 100 can comprise one guide rod 30; or the clamp 100 can comprise two guide rods 30; or the clamp 100 can comprise a larger number of guide rods 30.

[0082] In embodiments of the present application, the clamping plate 10 has a through hole for the guide rod 30 to penetrate, and the size of the through hole is larger than the size of the guide rod 30, so that the clamping plate 10 can be more easily moved along the guide rod 30. For example, the through hole on the clamping plate 10 is a circular hole, and the guide rod 30 is a cylindrical rod, and the diameter of the cylindrical rod is larger than the diameter of the through hole.

[0083] In embodiments of the present application, the guide rod 30 penetrates the clamping plate 10 to control the movement of the clamping plate 10 along the first direction X.

[0084] According to some embodiments of the present application, referring to FIG. 4 and FIG. 5, the pressure assembly 20 comprises a pressure plate 21, a first elastic member 22 and an adjusting member 23. The pressure plate 21 is located at least one side of the clamping plate 10 along the first direction X, and the guide rod 30 penetrates the pressure plate 21; the first elastic member 22 is located between the pressure plate 21 and the clamping plate 10, and the opposite ends of the first elastic member 22 along the first direction X are respectively abutted against the pressure plate 21 and the clamping plate 10; the adjusting member 23 is located at the side of the pressure plate 21 away from the clamping plate 10, and the adjusting member 23 is configured to adjust the distance between the pressure plate 21 and the clamping plate 10 along the first direction X.

[0085] In some embodiments of the present application, the shape of the pressure plate 21 can be consistent with the shape of the clamping plate 10, for example, the clamping plate 10 is a rectangular plate, and the pressure plate 21 is also a rectangular plate; or the clamping plate 10 is a circular plate, and the pressure plate 21 is also a circular plate.

[0086] In some embodiments of the present application, the shape of the pressure plate 21 can be inconsistent with the shape of the clamping plate 10, for example, the clamping plate 10 is a rectangular plate, and the pressure plate 21 is a circular plate; or the clamping plate 10 is a circular plate, and the pressure plate 21 is a rectangular plate.

[0087] In embodiments of the present application, the pressure plate 21 can be located at one side of the clamping plate 10 along the first direction X, or the pressure plate 21 can be located at opposite sides of the clamping plate 10 along the first direction X.

[0088] In embodiments of the present application, the guide rod 30 penetrates the pressure plate 21, so that the pressure plate 21 can also move along the first direction X.

[0089] In some embodiments of the present application, the first elastic member 22 can be a spring, and the spring is sleeved on the guide rod 30.

[0090] In other embodiments of the present application, the first elastic member 22 can be a torsion spring or a spring sheet, and the two spring arms of the torsion spring or the spring sheet are respectively abutted against the pressure plate 21 and the clamping plate 10.

[0091] In embodiments of the present application, the opposite ends of the first elastic member 22 along the first direction X are respectively abutted against the pressure plate 21 and the clamping plate 10, the first elastic member 22 provides a spring force to the pressure plate 21 along the first direction X away from the first elastic member 22, and at the same time, the first elastic member 22 provides a spring force to the clamping plate 10 along the first direction X away from the first elastic member 22.

[0092] In the embodiment of the present application, the adjusting piece 23 is located on the side of the pressure plate 21 away from the clamping plate 10, thereby blocking the movement of the pressure plate 21 away from the clamping plate 10, so that the first elastic piece 22 is always in a compressed state and can always provide the clamping plate 10 with elastic force, thereby enabling the clamping plate 10 to provide the packaged electrode assembly 200 with pre-tightening force.

[0093] When the clamp 100 clamps packaged electrode assemblies 200 of different models, the pre-tightening force provided by the clamp 100 to the packaged electrode assemblies 200 can not be the same. In the embodiment of the present application, the distance between the pressure plate 21 and the clamping plate 10 along the first direction X can be adjusted by the adjusting piece 23, so that the compression amount of the first elastic piece 22 changes, thereby changing the elastic force provided by the first elastic piece 22 to the clamping plate 10 and adjusting the pre-tightening force of the clamping plate 10 to the packaged electrode assembly 200.

[0094] For example, when the adjusting piece 23 adjusts the distance between the pressure plate 21 and the clamping plate 10 to decrease, the compression amount of the first elastic piece 22 increases, the elastic force provided by the first elastic piece 22 to the clamping plate 10 increases, and the pre-tightening force provided by the clamping plate 10 to the packaged electrode assembly 200 increases. When the adjusting piece 23 adjusts the distance between the pressure plate 21 and the clamping plate 10 to increase, the compression amount of the first elastic piece 22 decreases, the elastic force provided by the first elastic piece 22 to the clamping plate 10 decreases, and the pre-tightening force provided by the clamping plate 10 to the packaged electrode assembly 200 decreases.

[0095] In the process of isostatic pressing of the packaged electrode assembly 200 by the clamp 100, the thickness of the packaged electrode assembly 200 decreases, thereby increasing the distance between the clamping plate 10 and the pressure plate 21. In the related art, the pre-tightening force provided to the packaged electrode assembly 200 can not be provided in the subsequent process of isostatic pressing. In the embodiment of the present application, the clamping plate 10 provides the packaged electrode assembly 200 with pre-tightening force by the elastic force provided by the first elastic piece 22. Even if the thickness of the packaged electrode assembly 200 decreases to increase the distance between the clamping plate 10 and the pressure plate 21, as long as the first elastic piece 22 is in a compressed state, the clamp 100 can still provide the packaged electrode assembly 200 with pre-tightening force in the process of isostatic pressing, thereby improving the stability of the packaged electrode assembly 200, reducing the influence of deformation of the packaging film on the electrode assembly, and improving the stability of the electrode assembly.

[0096] In the embodiment of the present application, when the packaged electrode assembly 200 is taken out and put in, the adjusting piece 23 is used to reduce the elastic force provided by the first elastic piece 22 to the clamping plate 10, thereby facilitating the adjustment of the distance between two adjacent clamping plates 10 and the taking out and putting in of the packaged electrode assembly 200.

[0097] According to some embodiments of the present application, FIG. 8 is a structural schematic diagram of the clamp part according to some embodiments of the present application. Referring to FIGS. 5 and 8, the pressure assembly 20 further comprises a baffle 24, a slide rod 25 and a second elastic member 26. The baffle 24 is located between the pressure plate 21 and the adjusting member 23, and the guide rod 30 penetrates the baffle 24; the slide rod 25 extends along the first direction X, one end of the slide rod 25 is in contact with the pressure plate 21, and the other end of the slide rod 25 penetrates the baffle 24; the second elastic member 26 is located between the pressure plate 21 and the baffle 24, and opposite ends of the second elastic member 26 along the first direction X are respectively in abutment with the pressure plate 21 and the baffle 24. The adjusting member 23 is slidably connected with the other end of the slide rod 25, and the sliding direction of the adjusting member 23 is the same as the first direction X.

[0098] In embodiments of the present application, the shape of the baffle 24 can be the same as or different from that of the pressure plate 21.

[0099] In embodiments of the present application, the other end of the slide rod 25 penetrates the baffle 24, so that the baffle 24 can also move along the first direction X.

[0100] In some embodiments of the present application, the second elastic member 26 can be the same as or different from the first elastic member 22, for example, the second elastic member 26 can be a spring, and the spring is sleeved on the slide rod 25.

[0101] In embodiments of the present application, opposite ends of the second elastic member 26 along the first direction X are respectively in abutment with the pressure plate 21 and the baffle 24, the second elastic member 26 provides a spring force to the pressure plate 21 away from the second elastic member 26 along the first direction X, so that the pressure plate 21 can provide a spring force to the first elastic member 22, and the first elastic member 22 is in a compressed state. At the same time, the second elastic member 26 provides a spring force to the baffle 24 away from the second elastic member 26 along the first direction X.

[0102] In embodiments of the present application, the adjusting member 23 is slidably connected with the other end of the slide rod 25, and when the adjusting member 23 is connected with the slide rod 25, it blocks the baffle 24 from moving to the side away from the pressure plate 21, so that the second elastic member 26 is always in a compressed state, and the second elastic member 26 can always provide a spring force to the pressure plate 21, so that the pressure plate 21 can provide a spring force to the first elastic member 22, and the first elastic member 22 is in a compressed state, and the first elastic member 22 can push the clamping plate 10 to provide a pre-tightening force to the packaged electrode assembly 200.

[0103] In the embodiment of the present application, the adjusting member 23 slides on the slide rod 25 along the first direction X to adjust the distance between the pressure plate 21 and the baffle 24, so that the compression amount of the second elastic member 26 changes, the elastic force of the second elastic member 26 on the pressure plate 21 changes, the elastic force of the pressure plate 21 on the first elastic member 22 changes, the elastic force provided by the first elastic member 22 on the clamping plate 10 changes, and the pre-tightening force of the clamping plate 10 on the packaged electrode assembly 200 changes. The pre-tightening force of the clamping plate 10 on the packaged electrode assembly 200 is changed through multi-stage elastic force transmission, and the elastic force can be more evenly transmitted to the next stage in the process of each stage of elastic force transmission, so that the pre-tightening force of the clamping plate 10 on the packaged electrode assembly 200 is more uniform.

[0104] According to some embodiments of the present application, referring to FIG. 5, the pressure plate 21 includes a first sub-pressure plate 211 and a second sub-pressure plate 212, the first sub-pressure plate 211 is located on one side of the clamping plate 10 along the first direction X, and the guide rod 30 penetrates through the first sub-pressure plate 211. In combination with FIG. 5 and FIG. 8, the second sub-pressure plate 212 is attached to the side of the first sub-pressure plate 211 away from the clamping plate 10. Wherein, one end of the slide rod 25 is connected with the second sub-pressure plate 212.

[0105] In the embodiment of the present application, the guide rod 30 penetrates through the first sub-pressure plate 211, and the guide rod 30 is generally located in the edge side area of the first sub-pressure plate 211, and the second sub-pressure plate 212 can be attached to the middle area of the first sub-pressure plate 211.

[0106] In the embodiment of the present application, when the adjusting member 23 slides on the slide rod 25, assuming that the adjusting member 23 moves towards the pressure plate 21, the adjusting member 23 pushes the baffle 24 to move towards the pressure plate 21, so that the distance between the pressure plate 21 and the baffle 24 decreases, the compression amount of the second elastic member 26 changes, the elastic force of the second elastic member 26 on the second sub-pressure plate 212 increases, the second sub-pressure plate 212 transmits the elastic force to the first sub-pressure plate 211, so that the elastic force of the first sub-pressure plate 211 on the first elastic member 22 increases, the elastic force provided by the first elastic member 22 on the clamping plate 10 increases, and the pressure of the clamping plate 10 on the packaged electrode assembly 200 increases. In the process of transmitting the elastic force from the second sub-pressure plate 212 to the first sub-pressure plate 211, the entire surface of the second sub-pressure plate 212 pushes the first sub-pressure plate 211, that is, the stress area of the first sub-pressure plate 211 increases, so that the elastic force received by the first sub-pressure plate 211 is more uniform, and the elastic force transmitted by the first sub-pressure plate 211 to the clamping plate 10 through the first elastic member 22 is also more uniform, thereby making the pre-tightening force of the clamping plate 10 on the packaged electrode assembly 200 more uniform.

[0107] According to some embodiments of the present application, referring to FIGS. 4 and 5, the pressure assembly 20 further comprises a first limiting member 27, which is connected with the guide rod 30, and the surface of the first sub-pressure plate 211 away from the clamping plate 10 abuts against the first limiting member 27.

[0108] In the embodiments of the present application, the first elastic member 22 pushes the first sub-pressure plate 211 to move away from the clamping plate 10, and when the first sub-pressure plate 211 moves to abut against the first limiting member 27, the first limiting member 27 can limit the first sub-pressure plate 211 from continuing to move, so that the first elastic member 22 is always in a compressed state, and the clamping plate 10 can continuously provide a pre-tightening force to the packaged electrode assembly 200.

[0109] In the embodiments of the present application, the first limiting member 27 is detachably connected with the guide rod 30. For example, the guide rod 30 has external threads, and the first limiting member 27 is a bolt which is threadedly connected with the guide rod 30. Alternatively, the guide rod 30 has limiting holes arranged along the first direction X, the first limiting member 27 is sleeved on the guide rod 30, and a limiting rod is inserted into the corresponding limiting hole. When the first sub-pressure plate 211 abuts against the first limiting member 27, the limiting rod and the first sub-pressure plate 211 resist the first limiting member 27 from both sides, thereby fixing the first limiting member 27.

[0110] According to some embodiments of the present application, referring to FIGS. 4 and 5, the pressure assembly 20 further comprises a second limiting member 28, which is connected with the guide rod 30, and the surface of the baffle 24 away from the pressure plate 21 abuts against the second limiting member 28.

[0111] In the embodiments of the present application, the second elastic member 26 pushes the baffle 24 to move away from the pressure plate 21, and when the baffle 24 moves to abut against the second limiting member 28, the second limiting member 28 can limit the baffle 24 from continuing to move, so that the second elastic member 26 is always in a compressed state, and the second elastic member 26 can sequentially transmit elastic force to the clamping plate 10.

[0112] In the embodiments of the present application, the second limiting member 28 is detachably connected with the guide rod 30. For example, the guide rod 30 has external threads, and the second limiting member 28 is a bolt which is threadedly connected with the guide rod 30. Alternatively, the guide rod 30 has limiting holes arranged along the first direction X, the second limiting member 28 is sleeved on the guide rod 30, and a limiting rod is inserted into the corresponding limiting hole. When the baffle 24 abuts against the second limiting member 28, the limiting rod and the baffle 24 resist the second limiting member 28 from both sides, thereby fixing the second limiting member 28.

[0113] According to some embodiments of the present application, the slide rod 25 has external threads, and the adjusting member 23 is threadedly connected with the slide rod 25.

[0114] Exemplarily, the adjusting member 23 can be a bolt; or the adjusting member 23 can be another internally threaded component.

[0115] In the embodiment of the present application, the adjusting member 23 is threadedly connected with the slide rod 25, and the distance between the baffle 24 and the second sub-pressure plate 212 is adjusted by screwing the adjusting member 23, which is more convenient, and at the same time, stepless adjustment of the distance between the baffle 24 and the second sub-pressure plate 212 can be realized, that is, stepless adjustment of the pre-tightening force of the clamping plate 10 on the packaged electrode assembly 200 can be realized.

[0116] According to some embodiments of the present application, referring to FIGS. 4, 5 and 8, the pressure assembly 20 further comprises a gasket 29, which is located between the clamping plate 10 and the first elastic member 22, and / or the gasket 29 is located between the pressure plate 21 and the first elastic member 22. The guide rod 30 penetrates the gasket 29.

[0117] In the embodiment of the present application, the pressure assembly 20 can comprise a plurality of gaskets 29, wherein a part of the gaskets 29 are located between the clamping plate 10 and the first elastic member 22, and another part of the gaskets 29 are located between the pressure plate 21 and the first elastic member 22. Or all the gaskets 29 are located between the clamping plate 10 and the first elastic member 22. Or all the gaskets 29 are located between the pressure plate 21 and the first elastic member 22.

[0118] In the embodiment of the present application, the two ends of the first elastic member 22 are respectively abutted against the pressure plate 21 and the clamping plate 10, and the gasket 29 is arranged between the clamping plate 10 and the first elastic member 22 and / or between the pressure plate 21 and the first elastic member 22, which can reduce the extrusion of the first elastic member 22 on the pressure plate 21 and / or the clamping plate 10, and reduce the possibility of damage of the pressure plate 21 and / or the clamping plate 10.

[0119] According to some embodiments of the present application, the clamp 100 comprises a plurality of guide rods 30, and the plurality of guide rods 30 are arranged in a circumferential interval around the side edge of the clamping plate 10.

[0120] Exemplarily, the clamping plate 10 is a rectangular plate, and the clamp 100 comprises four guide rods 30, and the four guide rods 30 are respectively located at the four corners of the rectangular plate.

[0121] In other implementations, the clamping plate 10 is a circular plate, and the plurality of guide rods 30 are arranged around the circular plate.

[0122] In the embodiment of the present application, the plurality of guide rods 30 are arranged in a circumferential interval around the side edge of the clamping plate 10, which reduces the side bending of the clamping plate 10 when the clamping plate 10 moves along the guide rod 30, the clamping plate 10 moves more stably, and the pre-tightening force provided by the clamping plate 10 on the packaged electrode assembly 200 is more uniform.

[0123] According to some embodiments of the present application, referring to FIG. 4 and FIG. 5, the clamp 100 further comprises a base 40, the base 40 and the pressure assembly 20 are located on opposite sides of the clamping plate 10 along the first direction X, one end of the guide rod 30 is connected with the base 40, and the other end of the guide rod 30 is connected with the pressure assembly 20.

[0124] In the embodiments of the present application, one end of the guide rod 30 is connected with the pressure assembly 20, and the other end of the guide rod 30 is connected with the base 40.

[0125] In the embodiments of the present application, the base 40 is provided to support the guide rod 30, so that the entire clamp 100 is more stable.

[0126] Referring to FIG. 5, along the first direction X, the clamping plates 10 located at both ends of the plurality of clamping plates 10 are thicker.

[0127] According to some embodiments of the present application, referring to FIG. 5, the clamp 100 further comprises a pressure sensor 50, the pressure sensor 50 is connected with the base 40, and the clamping plate 10 abuts against the pressure sensor 50.

[0128] It should be noted that in FIG. 5, in order to clearly show the pressure sensor 50, the clamping plate 10 does not abut against the pressure sensor 50. In actual use, the clamping plate 10 abuts against the pressure sensor 50.

[0129] The force is mutual, in the embodiments of the present application, the clamping plate 10 provides pressure (i.e. pre-tightening force) to the packaged electrode assembly 200, and the packaged electrode assembly 200 also provides pressure to the clamping plate 10, and the pressure received by the opposite sides of the clamping plate 10 is equal. Since the clamping plate 10 abuts against the pressure sensor 50, the pressure detected by the pressure sensor 50 can be regarded as the pre-tightening force of the clamping plate 10 to the packaged electrode assembly 200. The pressure sensor 50 can be provided to monitor the pre-tightening force of the clamping plate 10 to the packaged electrode assembly 200 in real time, when the pre-tightening force of the clamping plate 10 to the packaged electrode assembly 200 reaches a preset value, the clamping plate 10 can be controlled to no longer increase the pre-tightening force applied to the packaged electrode assembly 200. At the same time, the pressure sensor 50 is detachably connected with the base 40, and when isostatic pressing is performed, the pressure sensor 50 can be detached to avoid damage to the pressure sensor 50 during isostatic pressing.

[0130] At the same time, for the same model of packaged electrode assembly 200, the pre-tightening force of the clamping plate 10 to the packaged electrode assembly 200 can be made to reach the same preset value through the pressure sensor 50, and after subsequent isostatic pressing, the densification effect of the packaged electrode assembly 200 is more uniform, and the uniformity of the battery is better.

[0131] FIG. 9 is an exploded schematic view of part of the clamp in an embodiment of the present application. Referring to FIG. 9, the base 40 can be a base plate. The middle of the base has a mounting hole 41 with internal threads, and the housing of the pressure sensor 50 can have external threads. The pressure sensor 50 is screwed into the mounting hole 41, so that the pressure sensor 50 is detachably connected to the base 40.

[0132] In other implementations, the pressure sensor 50 can be bonded or clamped to the base 40.

[0133] In an embodiment of the present application, the pre-tightening force is greater than or equal to 100 kiloNewtons (KN) and less than or equal to 6000 KN, which is equivalent to a surface pressure of the packaged electrode assembly 200 greater than or equal to 3 megapascals (MPa) and less than or equal to 220 MPa. Exemplarily, the pre-tightening force is 300 KN, and the surface pressure is 100 MPa.

[0134] The pre-tightening force and the surface pressure are related by the equation P = F / S, where P is the surface pressure of the packaged electrode assembly, F is the pre-tightening force, and S is the contact area of the packaged electrode assembly with the clamp.

[0135] According to some embodiments of the present application, referring to FIGS. 4 and 9, the side surface of the clamping plate 10 facing the base 40 has a transmission block 13 that abuts the pressure sensor 50.

[0136] Exemplarily, the transmission block 13 is located on the clamping plate 10 closest to the base 40.

[0137] In an embodiment of the present application, providing the transmission block 13 that abuts the pressure sensor 50 can reduce the likelihood of damage to the clamping plate 10 caused by excessive pressure between the pressure sensor 50 and the clamping plate 10.

[0138] After the packaged electrode assembly 200 is subjected to isostatic pressing, the clamp 100 and the packaged electrode assembly 200 are removed from the isostatic pressing device, the packaged electrode assembly 200 is removed from the clamp 100, and the clamp 100 is cleaned for subsequent use.

[0139] Exemplarily, the cleaning of the clamp 100 uses one or more of a combination of anhydrous ethanol soaking, ultrasonic cleaning, and high-speed centrifugation.

[0140] The pressurizing medium of the isostatic pressing can be oil or water. The temperature of the isostatic pressing is greater than or equal to 0 degrees Celsius (°C) and less than or equal to 500 °C. The pressure of the isostatic pressing is greater than or equal to 100 MPa and less than or equal to 2000 MPa. The time of the isostatic pressing is greater than or equal to 1 minute (min) and less than or equal to 90 min. Exemplarily, the pressurizing medium of the isostatic pressing is oil, the temperature of the isostatic pressing is 200 °C, the pressure of the isostatic pressing is 800 MPa, and the time of the isostatic pressing is 30 min.

[0141] After the encapsulated electrode assembly 200 is clamped by the clamp 100 provided in the embodiment of the present application and is subjected to isostatic pressing, the encapsulated film of the encapsulated electrode assembly 200 is removed to obtain an electrode assembly, the density of the electrode assembly is greater than or equal to 90%, and the flatness of the electrode assembly is less than or equal to 0.1 mm.

[0142] The density of the electrode assembly can be calculated by the following formula:

[0143] Wherein, τ is the density; m is the mass of the electrode assembly; V is the apparent volume of the electrode assembly; and ρ is the true density of the electrode assembly, which can be measured by a conventional true density instrument.

[0144] The flatness of the electrode assembly refers to the distance deviation between the surface of the electrode assembly and a reference plane. The flatness of the electrode assembly can be measured by a flat crystal interference method, a watch measurement method, a liquid plane method, a light beam plane method, or a laser flatness measuring instrument.

[0145] The embodiment of the present application provides an isostatic pressing device, which comprises the clamp 100 according to any one of the above embodiments.

[0146] The embodiment of the present application provides a battery production equipment, which comprises the isostatic pressing device according to any one of the above embodiments, and the isostatic pressing device is used for isostatic pressing treatment of the encapsulated electrode assembly 200.

[0147] The embodiment of the present application provides a clamp 100 for clamping an encapsulated electrode assembly 200, which comprises a plurality of clamping plates 10, a pressure assembly 20, a plurality of guide rods 30, a base 40, and a pressure sensor 50. The clamping plates 10 are stacked along a first direction X, the first direction X is perpendicular to the surface of the clamping plate 10, and the encapsulated electrode assembly 200 is located between any two adjacent clamping plates 10. The guide rods 30 penetrate through the clamping plates 10, and the plurality of guide rods 30 are arranged in a circumferential interval around the side edges of the clamping plates 10. The base 40 and the pressure assembly 20 are located on opposite sides of the clamping plates 10 along the first direction X. The pressure sensor 50 is detachably connected to the base 40. One end of the guide rod 30 is connected to the pressure assembly 20, and the other end of the guide rod 30 is connected to the base 40. The side of the clamping plate 10 facing the base 40 is connected to a transmission block 13, and the transmission block 13 abuts against the pressure sensor 50. The pressure assembly 20 is configured to apply pressure to the clamping plates 10 along the first direction X, so that any two adjacent clamping plates 10 are close to each other.

[0148] The pressure assembly 20 comprises a pressure plate 21, a first elastic member 22, an adjusting member 23, a baffle plate 24, a sliding rod 25, a second elastic member 26, a first limiting member 27, a second limiting member 28, and a gasket 29.

[0149] The pressure plate 21 comprises a first sub-pressure plate 211 and a second sub-pressure plate 212. The first sub-pressure plate 211 is located at one side of the clamping plate 10 along the first direction X, and the guide rod 30 penetrates the first sub-pressure plate 211. The second sub-pressure plate 212 is attached to the side of the first sub-pressure plate 211 away from the clamping plate 10.

[0150] The baffle plate 24 is located at the side of the second sub-pressure plate 212 away from the first sub-pressure plate 211, the guide rod 30 penetrates the baffle plate 24, the slide rod 25 extends along the first direction X, one end of the slide rod 25 is connected to the second sub-pressure plate 212, the other end of the slide rod 25 penetrates the baffle plate 24, the adjusting piece 23 is located at the side of the baffle plate 24 away from the second sub-pressure plate 212, the slide rod 25 has an external thread, and the adjusting piece 23 is threadedly connected to the slide rod 25.

[0151] The first elastic piece 22 and the second elastic piece 26 are both springs, the first elastic piece 22 is sleeved on the guide rod 30, and the second elastic piece 26 is sleeved on the slide rod 25. The guide rod 30 penetrates the first limiting piece 27, the second limiting piece 28 and the gasket 29, the first limiting piece 27 is located between the first sub-pressure plate 211 and the baffle plate 24, the second limiting piece 28 is located at the side of the baffle plate 24 away from the second sub-pressure plate 212, part of the gasket 29 is located between the first sub-pressure plate 211 and the first elastic piece 22, and the other part of the gasket 29 is located between the clamping plate 10 and the first elastic piece 22.

[0152] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A clamp (100) for clamping a packaged electrode assembly (200), the clamp (100) comprising: at least two clamping plates (10) stacked along a first direction intersecting a surface of the clamping plates (10), the packaged electrode assembly (200) being located between any two adjacent clamping plates (10) ; a pressure assembly (20) configured to apply pressure to the clamping plates (10) along the first direction to cause any two adjacent clamping plates (10) to approach each other; wherein the clamping plate (10) comprises a support layer (11) and a flexible layer (12) stacked along the first direction, the flexible layer (12) being located on at least one side of the support layer (11) close to the packaged electrode assembly (200), the flexible layer (12) having a hardness less than that of the support layer (11).

2. The clamp of claim 1, wherein, The material of the support layer (11) comprises one of aluminum, stainless steel and polytetrafluoroethylene, and / or the material of the flexible layer (12) comprises one of silica gel, rubber, polyethylene and polypropylene.

3. The clamp of claim 1 or 2, wherein, The clamp (100) further comprises: a guide rod (30) extending along the first direction, the guide rod (30) penetrating through the clamping plates (10).

4. The clamp of claim 3, wherein, The pressure assembly (20) comprises: a pressure plate (21) located on at least one side of the clamping plates (10) along the first direction, the guide rod (30) penetrating through the pressure plate (21) ; a first elastic member (22) located between the pressure plate (21) and the clamping plates (10), opposite ends of the first elastic member (22) along the first direction abutting against the pressure plate (21) and the clamping plates (10) respectively; an adjusting member (23) located on a side of the pressure plate (21) away from the clamping plates (10), the adjusting member (23) being configured to adjust a distance between the pressure plate (21) and the clamping plates (10) along the first direction.

5. The clamp of claim 4, wherein, The pressure assembly (20) further comprises: a baffle (24) located between the pressure plate (21) and the adjusting member (23), the guide rod (30) penetrating through the baffle (24) ; a slide rod (25) extending along the first direction, one end of the slide rod (25) being in contact with the pressure plate (21), the other end of the slide rod (25) penetrating through the baffle (24) ; a second elastic member (26) located between the pressure plate (21) and the baffle (24), opposite ends of the second elastic member (26) along the first direction abutting against the pressure plate (21) and the baffle (24) respectively; wherein the adjusting member (23) is slidably connected with the other end of the slide rod (25), a sliding direction of the adjusting member (23) being the same as the first direction.

6. The clamp of claim 5, wherein, The pressure plate (21) comprises: a first sub-pressure plate (211) located on one side of the clamping plates (10) along the first direction, the guide rod (30) penetrating through the first sub-pressure plate (211) ; A second sub-pressure plate (212) is attached to the side of the first sub-pressure plate (211) away from the clamping plate (10); One end of the slide rod (25) is connected to the second sub-pressure plate (212).

7. The clamp of claim 6, wherein, The pressure assembly (20) further comprises: A first limiting member (27) is connected to the guide rod (30), and the surface of the first sub-pressure plate (211) away from the clamping plate (10) abuts against the first limiting member (27).

8. The clamp of claim 6 or 7, wherein, The pressure assembly (20) further comprises: A second limiting member (28) is connected to the guide rod (30), and the surface of the baffle (24) away from the pressure plate (21) abuts against the second limiting member (28).

9. The clamp of any one of claims 5-8, wherein, The slide rod (25) has external threads, and the adjusting member (23) is threadedly connected to the slide rod (25).

10. The clamp of any one of claims 4 to 9, wherein, The pressure assembly (20) further comprises: A gasket (29) is located between the clamping plate (10) and the first elastic member (22), and / or the gasket (29) is located between the pressure plate (21) and the first elastic member (22); The guide rod (30) penetrates the gasket (29).

11. The clamp of any one of claims 3-10, wherein, The clamp (100) comprises a plurality of guide rods (30) that are circumferentially spaced around the side edges of the clamping plate (10).

12. The clamp of any one of claims 3-11, wherein, The clamp (100) further comprises: A base (40) and the pressure assembly (20) are located on opposite sides of the clamping plate (10) in the first direction, one end of the guide rod (30) is connected to the base (40), and the other end of the guide rod (30) is connected to the pressure assembly (20).

13. The clamp of claim 12, wherein, The clamp (100) further comprises: A pressure sensor (50) is connected to the base (40), and the clamping plate (10) abuts against the pressure sensor (50).

14. The clamp of claim 13, wherein, The side surface of the clamping plate (10) facing the base (40) has a transmission block (13) that abuts against the pressure sensor (50).

15. An isostatic pressing device comprising the clamp (100) according to any one of claims 1 to 14.

16. A battery production apparatus comprising the isostatic pressing device according to claim 15, wherein the isostatic pressing device is used for isostatic pressing treatment of a packaged electrode assembly (200).

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