Battery pressurizing device, battery production system, and battery pressurizing method

Abstract

Some embodiments of the present application provide a battery pressurizing device, a battery production system, and a battery pressurizing method. In the battery pressurizing device, a bearing device comprises a plurality of pressurizing members arranged at intervals; battery cells are placed between adjacent pressurizing members, and the pressurizing members apply pressure to the battery cells; a pressure-sensitive coating is provided on the surface of each pressurizing member facing the corresponding battery cell; and a detection mechanism is configured to generate, on the basis of the change of the state of the pressure-sensitive coating, information of pressure applied to the pressure-sensitive coating. The pressure-sensitive coating is provided on the surface of each pressurizing member facing the corresponding battery cell, the detection mechanism can generate, on the basis of the change of the state of the pressure-sensitive coating, the information of pressure applied to the pressure-sensitive coating, and information of pressure applied by the battery pressurizing device to the battery cells can be learnt, thereby facilitating adjustment of pressure exerted on the battery cells. Therefore, the risk of damage to battery cells due to excessive pressure from pressurizing members can be reduced, and poor formation caused by obstructed gas discharge due to insufficient pressure from the pressurizing members can be minimized, thereby improving the formation quality of the battery cells.

Description

Battery pressurizing device, battery production system and battery pressurizing method

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410657829.2, filed on May 24, 2024, entitled “Battery pressurizing device, battery production system and battery pressurizing method”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery detection, and in particular to a battery pressurizing device, a battery production system and a battery pressurizing method. BACKGROUND

[0004] Batteries have high specific energy and high power density, and are widely used in electronic devices and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools, etc.

[0005] Formation as a process for activating a battery has a very important influence on the performance of the battery, and how to monitor the formation of the battery and improve the formation quality is increasingly concerned by those skilled in the art.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a battery pressurizing device, a battery production system and a battery pressurizing method, which is beneficial to improve the formation quality of the battery monomer.

[0008] In a first aspect, some embodiments of the present application provide a battery pressurizing device, which comprises a supporting device, a pressure-sensitive coating and a detection mechanism, the supporting device comprises a plurality of pressure pieces arranged at intervals, adjacent pressure pieces are used to place a battery monomer, and the pressure pieces are used to press the battery monomer; the pressure-sensitive coating is arranged on the surface of the pressure piece facing the battery monomer; and the detection mechanism is configured to generate pressure information received by the pressure-sensitive coating according to the state change of the pressure-sensitive coating.

[0009] In the above structure, since the surface of the pressure piece facing the battery monomer is provided with the pressure-sensitive coating, and the detection mechanism can generate the pressure information received by the pressure-sensitive coating according to the state change of the pressure-sensitive coating, the pressure information applied by the battery pressurizing device to the battery monomer can be successfully obtained, which is convenient for adjusting the pressure received by the battery monomer, so that the pressure received by the battery monomer is within a reasonable range, which not only can reduce the possibility of damaging the battery monomer due to excessive pressure applied by the pressure piece, but also can reduce the formation failure caused by poor exhaust due to insufficient pressure applied by the pressure piece, and is beneficial to improve the formation quality of the battery monomer.

[0010] According to the battery pressurizing device provided by some embodiments of the present application, the thickness of the pressure-sensitive coating is A, 0.5mm≤A≤4mm; optionally, 1mm≤A≤2mm, so that the pressure-sensitive coating can have a more significant state change for different pressure intensity, and is not prone to material waste due to excessive thickness.

[0011] According to the battery pressurizing device provided by some embodiments of the present application, the detection mechanism comprises a light-emitting unit, a pattern acquisition unit and a processing unit, the light-emitting unit is used for emitting light to the supporting device; the pattern acquisition unit is used for acquiring the image of the pressure-sensitive coating; the processing unit is in communication connection with the pattern acquisition unit, and the processing unit is used for converting the light intensity information of the image into pressure intensity information, so that the detection mechanism can generate the pressure intensity information received by the pressure-sensitive coating according to the change of the light intensity information.

[0012] According to the battery pressurizing device provided by some embodiments of the present application, the light-emitting unit comprises an ultraviolet lamp or a laser lamp, so that the light emitted by the light-emitting unit can be used as excitation light, and the pressure-sensitive coating can better reflect the light emitted by the light-emitting unit outward, which is beneficial to improve the accuracy of the pressure intensity information obtained by the detection mechanism.

[0013] According to the battery pressurizing device provided by some embodiments of the present application, the angle between the direction of the light-emitting end of the light-emitting unit and the spacing direction of the pressurizing pieces is C, 20°≤C≤90°, so that the light emitted by the light-emitting unit can well cover the entire supporting device, and the light emitted by the light-emitting unit can irradiate the plurality of pressurizing pieces in the supporting device.

[0014] According to the battery pressurizing device provided by some embodiments of the present application, the angle between the direction of the acquisition end of the pattern acquisition unit and the spacing direction of the pressurizing pieces is D, 20°≤D≤90°, so that the acquisition end of the pattern acquisition unit can well receive the light reflected by the entire supporting device, and the light reflected by the plurality of pressurizing pieces in the supporting device can be acquired by the pattern acquisition unit.

[0015] According to the battery pressurizing device provided by some embodiments of the present application, the light-emitting uniformity of the light-emitting unit is greater than 85%, so that the light emitted by the light-emitting unit is relatively uniform, and the intensity is consistent, which is beneficial to make the intensity of the light received by the pressure-sensitive coating on the plurality of pressurizing pieces in the supporting device more consistent, and is beneficial to improve the accuracy of the pressure intensity information measured by the detection mechanism.

[0016] According to the battery pressing device provided by some embodiments of the present application, the pressing member is provided with a pressing surface for pressing the battery monomer, and the pressing surface is configured as an arc surface protruding towards the space between the pressing members. By configuring the pressing surface as an arc surface protruding towards the space between the pressing members, the middle part of the large surface of the battery monomer can be pressed by the middle part of the pressing surface when the pressing member is pressed against the battery monomer, while the edge part of the large surface of the battery monomer is not pressed by the pressing surface, so that the motor assembly inside the battery monomer can be better pressed, and the shell of the battery monomer can bear less pressure from the pressing member.

[0017] According to the battery pressing device provided by some embodiments of the present application, the pressing member is configured to press the battery monomer by swelling.

[0018] According to the battery pressing device provided by some embodiments of the present application, the pressing member includes a capsule, and a cavity is formed in the capsule. The cavity is configured to communicate with a fluid delivery mechanism, and the fluid delivery mechanism is configured to deliver fluid to the cavity. The capsule is configured to press the battery monomer.

[0019] In the above structure, the fluid delivery mechanism can fill the cavity with fluid to realize the swelling deformation of the capsule by the pressure of the fluid, and then press the battery monomer by the capsule. By adjusting the fluid input by the fluid delivery mechanism, the pressure applied by the capsule to the battery monomer can be effectively controlled, thereby improving the reliability of the pressure.

[0020] According to the battery pressing device provided by some embodiments of the present application, the pressing member further includes an interface connected to the cavity, and a valve body connected to the interface and configured to be connected to the fluid delivery mechanism. By providing the interface on the capsule and installing the valve body, the amount of fluid medium filled in the cavity can be adjusted to change the volume of the capsule.

[0021] According to the battery pressing device provided by some embodiments of the present application, the pressing member includes a capsule and an inflatable body. The capsule is provided with a cavity, and the inflatable body is accommodated in the cavity. The inflatable body is configured to swell under a preset condition, and the capsule is configured to press the battery monomer. By controlling the swelling amount of the inflatable body, the pressure applied by the capsule to the battery monomer can be effectively controlled, thereby improving the reliability of the pressure.

[0022] According to the battery pressing device provided by some embodiments of the present application, the melting point of the capsule is T, and T≥80℃, so that the capsule can well resist the temperature rise of the battery monomer caused by charging and discharging, and the service life of the pressing member can be prolonged.

[0023] According to the battery pressing device provided by some embodiments of the present application, the Young's modulus of the capsule is B, and B≥12MPa, so that the texture of the capsule is not too soft, and the capsule can meet the requirement of elastic deformation, thereby facilitating the application of sufficient pressure to the battery monomer.

[0024] According to the battery pressing device provided by some embodiments of the present application, the projection of the battery cell is located in the projection range of the capsule along the interval direction of the pressing member, so that the battery cell is not easy to contact other components in the pressing member in the state of being clamped by the capsule, which is beneficial to reduce the possibility of the battery cell being damaged by collision.

[0025] According to the battery pressing device provided by some embodiments of the present application, the support device further comprises a bracket, and the pressing member further comprises a partition plate provided with an opening penetrating through along the thickness direction of the partition plate, and the capsule is connected to the opening and connected to the bracket through the partition plate. By opening the opening penetrating through along the thickness direction of the partition plate and arranging the capsule in the opening, the capsule can apply pressure to the battery cells located on both sides of the partition plate when the capsule expands in the opening.

[0026] In the second aspect, some embodiments of the present application provide a battery production system, which comprises the battery pressing device provided by any of the technical solutions.

[0027] In the third aspect, some embodiments of the present application provide a battery pressing method, which comprises:

[0028] providing a support device, the support device comprising a plurality of pressing members arranged at intervals;

[0029] providing a pressure-sensitive coating arranged on the surface of the pressing member for facing the battery cell;

[0030] providing a detection mechanism;

[0031] placing the battery cell in the gap between the pressing members;

[0032] applying pressure to the battery cell by the pressing member;

[0033] generating pressure information of the pressure-sensitive coating by the detection mechanism according to the state change of the pressure-sensitive coating.

[0034] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0035] Some embodiments of the present application provide a battery pressurizing device, which comprises a supporting device, a pressure-sensitive coating and a detection mechanism, the supporting device comprises a plurality of pressure pieces arranged at intervals, the adjacent pressure pieces are used for placing battery monomers, and the pressure pieces are used for pressing the battery monomers; the pressure-sensitive coating is arranged on the surface of the pressure pieces facing the battery monomers; and the detection mechanism is configured to generate pressure information of the pressure-sensitive coating according to the state change of the pressure-sensitive coating. In the above structure, since the surface of the pressure pieces facing the battery monomers is provided with the pressure-sensitive coating, and the detection mechanism can generate the pressure information of the pressure-sensitive coating according to the state change of the pressure-sensitive coating, the pressure information applied to the battery monomers by the battery pressurizing device can be successfully obtained, the pressure applied to the battery monomers is adjusted, the pressure applied to the battery monomers is in a reasonable range, the possibility of damaging the battery monomers due to excessive pressure applied by the pressure pieces is reduced, and the poor formation caused by poor exhaust due to insufficient pressure applied by the pressure pieces is reduced, which is beneficial to improve the formation quality of the battery monomers.

[0036] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in different figures represent the same or similar components.

[0038] FIG. 1 is a front view of a battery pressurizing device provided by some embodiments of the present application in a state of clamping a battery monomer;

[0039] FIG. 2 is a top view of a battery pressurizing device provided by some embodiments of the present application in a state of clamping a battery monomer;

[0040] FIG. 3 is a structural schematic view of a pressure piece in a battery pressurizing device provided by some embodiments of the present application;

[0041] FIG. 4 is a structural schematic view of the inside of a pressure piece in a battery pressurizing device provided by some embodiments of the present application;

[0042] FIG. 5 is a structural schematic view of the inside of a pressure piece in a battery pressurizing device provided by some embodiments of the present application;

[0043] FIG. 6 is a flow chart of a battery pressurizing method provided by some embodiments of the present application.

[0044] In the drawings: 1, supporting device; 11, pressure piece; 111, pressure-sensitive coating; 112, abutting surface; 113, capsule; 114, cavity; 115, interface; 116, inflatable body; 117, partition; 1171, opening; 12, bracket; 2, light-emitting unit; 3, pattern acquisition unit; 10, battery cell. DETAILED DESCRIPTION

[0045] The embodiments of the technical solutions of the present application will be described in detail below with reference to the 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.

[0046] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0047] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0048] In addition, the technical terms "first", "second", and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0049] 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 internal communication of two elements or the 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.

[0050] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, a first feature is "on", "above", or "under" a second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact with an intermediate medium. Moreover, the first feature "over", "above", and "on" the second feature can mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below", and "under" the second feature can mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0051] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields.

[0052] The battery mentioned in the embodiments of the present application includes one or more battery modules, and the battery module refers to a single physical module including one or more battery monomers to provide higher voltage and capacity.

[0053] The battery monomer can be a secondary battery monomer, which refers to a battery monomer that can be activated by charging after discharging to continue to use.

[0054] The battery monomer can be an ion battery monomer, including but not limited to lithium ion battery monomer, sodium ion battery monomer, sodium lithium ion battery monomer, magnesium ion battery monomer, calcium ion battery monomer.

[0055] The battery monomer generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charging and discharging process of the battery monomer, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode.

[0056] In some embodiments, the electrode assembly further includes a separator, which is arranged between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0057] In some embodiments, the battery monomer further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application does not have specific limitations on the type of electrolyte, which can be selected according to the needs. The electrolyte can be liquid, gel or solid.

[0058] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0059] In some embodiments, the battery cell can include a casing. The casing is used to encapsulate components such as the electrode assembly and electrolyte. The casing can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc.

[0060] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shapes of battery cells, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0061] The production process of the battery cell generally includes stirring, coating, rolling, slitting, assembling, and formation, etc. The formation process is a very important process, which has a crucial influence on the cycle performance of the battery cell. The formation of the battery cell can refer to the first charge-discharge process of the battery cell after the battery cell is injected with liquid. Exemplarily, in a lithium ion battery cell, the formation can activate the active material in the battery cell, activate the lithium ion battery, at the same time, the lithium salt and the electrolyte have a side reaction, and a solid electrolyte interface (SEI) film is generated on the negative side of the battery cell. The layer film can prevent the further occurrence of the side reaction, thereby reducing the loss of active lithium in the battery cell. The quality of the SEI film has a great influence on the cycle life, the initial capacity loss, the rate performance, etc. of the battery cell.

[0062] During the formation, gas is generated inside the battery cell. If the gas cannot be discharged, it will cause problems such as interface lithium precipitation of the lithium ion battery cell. In addition, the gas will also cause the battery cell to swell and deform, resulting in the size specification of the battery cell not meeting the standard.

[0063] Therefore, in the formation process, it is usually necessary to press the battery cell to accelerate the discharge of the gas, reduce the gas remaining inside the battery cell, and reduce the deformation of the battery cell, thereby improving the appearance yield of the battery cell.

[0064] In some pressing devices, a pressing plate is usually used to press a row of battery cells from one side to press the battery cells. However, during the process of applying pressure from the pressing plate to the battery cell, it is difficult to know the pressure condition of the battery cell, and the force of the pressing plate on the battery cell is prone to be too large or too small, which is not conducive to improving the formation quality of the battery cell.

[0065] In order to improve the formation quality of the battery monomer, the battery pressurizing device provided in the embodiment itself comprises a supporting device, a pressure-sensitive coating and a detection mechanism. The supporting device comprises a plurality of pressure pieces arranged at intervals, and the battery monomer is placed between adjacent pressure pieces. The pressure pieces are used to press the battery monomer. The pressure-sensitive coating is arranged on the surface of the pressure piece facing the battery monomer. The detection mechanism is configured to generate pressure information of the pressure-sensitive coating according to the state change of the pressure-sensitive coating. In the above structure, since the surface of the pressure piece facing the battery monomer is provided with the pressure-sensitive coating, and the detection mechanism can generate the pressure information of the pressure-sensitive coating according to the state change of the pressure-sensitive coating, the pressure information applied to the battery monomer by the battery pressurizing device can be successfully obtained, the pressure applied to the battery monomer can be adjusted, the pressure applied to the battery monomer is in a reasonable range, which not only can reduce the possibility of damaging the battery monomer due to excessive pressure applied by the pressure piece, but also can reduce the formation failure caused by poor exhaust due to insufficient pressure applied by the pressure piece, and is conducive to improving the formation quality of the battery monomer.

[0066] The battery pressurizing device disclosed in the embodiment of the present application can be applied to the formation process of the battery, and can also be applied to other processes of the battery. For example, the battery pressurizing device of the embodiment of the present application can also be used in the liquid injection process. Specifically, in the liquid injection process, the electrolyte is injected into the inside of the battery monomer at a high pressure and a high speed, so that the internal pressure of the battery monomer is increased. The battery pressurizing device of the embodiment of the present application can press the battery monomer from the outside to offset the internal pressure of the battery monomer and reduce the deformation of the battery monomer.

[0067] Of course, the battery pressurizing device of the embodiment of the present application can be used to press the battery monomer, and can also be used to press other pressure pieces in the battery production process.

[0068] The technical solutions of the battery pressurizing device and the battery production system provided by the embodiment of the present application will be further described below.

[0069] Some embodiments of the present application provide a battery pressurizing device, as shown in FIG. 1 and FIG. 2, which comprises a supporting device 1, a pressure-sensitive coating 111 and a detection mechanism. The supporting device 1 comprises a plurality of pressure pieces 11 arranged at intervals, and the battery monomer 10 is placed between adjacent pressure pieces 11. The pressure pieces 11 are used to press the battery monomer 10. The pressure-sensitive coating 111 is arranged on the surface of the pressure piece 11 facing the battery monomer 10. The detection mechanism is configured to generate pressure information of the pressure-sensitive coating 111 according to the state change of the pressure-sensitive coating 111.

[0070] The support device 1 can be a device for carrying the battery monomer 10, and a plurality of battery monomers 10 are carried in and pressed in the support device 1. The pressing member 11 can be a member in the support device 1 for applying pressure to the battery monomer 10. The pressing members 11 are arranged at intervals, and the interval between two adjacent pressing members 11 is used to place the battery monomer 10, and the two adjacent pressing members 11 can press the battery monomer 10 located therebetween to apply pressure.

[0071] Exemplarily, the two adjacent pressing members 11 can occupy the interval therebetween, so that the battery monomer 10 located in the interval can be pressed by the pressing members.

[0072] The pressure-sensitive coating 111 can be a layered structure formed by pressure-sensitive paint. The pressure-sensitive paint can refer to paint that has different state changes under different pressures. Exemplarily, the pressure-sensitive paint can reflect light after being irradiated by light of a certain wavelength, and the pressure-sensitive paint can have different states under different pressures, so that the detection mechanism can obtain the pressure it receives through the state change of the pressure-sensitive paint.

[0073] By arranging the pressure-sensitive coating 111 on the surface of the pressing member 11 facing the battery monomer 10, the pressure-sensitive coating 111 can have different states according to the different pressures received during the pressing process of the pressing member 11 on the battery monomer 10.

[0074] The detection mechanism can be a mechanism for detecting the pressure received by the pressure-sensitive coating 111. By configuring the detection mechanism to be able to generate pressure information received by the pressure-sensitive coating 111 according to the state change of the pressure-sensitive coating 111, the detection mechanism can obtain the pressure received by the pressure-sensitive coating 111 according to the state change of the pressure-sensitive coating 111.

[0075] Exemplarily, the state change of the pressure-sensitive paint caused by different pressures received can be the change of the ratio of the reflected light intensity to the incident light intensity, so that the detection mechanism can further obtain the pressure received by the pressure-sensitive coating 111 by measuring the ratio of the reflected light intensity to the incident light intensity of the pressure-sensitive coating 111 through the optical device.

[0076] In some embodiments, the pressure-sensitive paint can be polycarbonate pressure-sensitive paint, can also be metal polymer pressure-sensitive paint, and can also be silicone rubber pressure-sensitive paint. Those skilled in the art can select the type of pressure-sensitive paint according to the actual situation.

[0077] In some embodiments, the thickness of the pressure-sensitive coating 111 is set to A, 0.5mm≤A≤4mm; optionally, 1mm≤A≤2mm.

[0078] By setting the thickness A of the pressure-sensitive coating 111 in the range of 0.5mm≤A≤4mm, the pressure-sensitive coating 111 can have a more significant state change under different pressure, and the pressure-sensitive coating 111 is less likely to cause material waste due to excessive thickness.

[0079] In some embodiments, by setting the thickness A of the pressure-sensitive coating 111 in the range of 1mm≤A≤2mm, the pressure-sensitive coating 111 can have a more significant state change under different pressure, and the pressure-sensitive coating 111 is less likely to cause material waste due to excessive thickness. For example, the thickness A of the pressure-sensitive coating 111 can be set to 1mm, 1.5mm or 2mm, so that the pressure-sensitive coating 111 can have a more significant state change under different pressure, and the pressure-sensitive coating 111 is less likely to cause material waste due to excessive thickness.

[0080] In some embodiments, the detection mechanism includes a light-emitting unit 2, a pattern acquisition unit 3 and a processing unit. The light-emitting unit 2 is used to emit light to the support device 1, the pattern acquisition unit 3 is used to acquire the image of the pressure-sensitive coating 111, and the processing unit is in communication connection with the pattern acquisition unit 3. The processing unit is used to convert the light intensity information of the image into pressure information.

[0081] The state change of the pressure-sensitive coating 111 caused by different pressures is the change of the ratio of the reflected light intensity to the incident light intensity, so that the detection mechanism can easily obtain the pressure information of the pressure-sensitive coating 111 through the measurement of the optical device.

[0082] The light-emitting unit 2 can be an optical device for emitting light outward. The light-emitting unit 2 emits light to the support device 1, so that the pressure-sensitive coating 111 on the pressure piece 11 can receive and reflect the light emitted by the light-emitting unit 2. The light reflected by the pressure-sensitive coating 111 has sufficient intensity to be acquired by the pattern acquisition unit 3, which is conducive to improving the accuracy of the measurement results of the detection mechanism.

[0083] For example, the light-emitting unit 2 can include a lampshade and a light-emitting diode. The light-emitting diode is arranged in the lampshade, and the opening 1171 of the lampshade faces the support device 1, which is used to supplement light to the pressure-sensitive coating 111. In some embodiments, the light-emitting unit 2 can be provided in multiple to enable the pressure-sensitive coating 111 to obtain light with sufficient intensity.

[0084] The pattern acquisition unit 3 can be an optical device for acquiring the image of the pressure-sensitive coating 111. The image of the pressure-sensitive coating 111 is acquired by the pattern acquisition unit 3, so that the intensity of the light emitted by the light-emitting unit 2 and reflected by the pressure-sensitive coating 111 can be obtained through the image acquired by the pattern acquisition unit 3.

[0085] Exemplarily, the graphic acquisition unit 3 can be a charge coupled device (CCD) graphic acquisition unit 3. The CCD graphic acquisition unit 3 has the advantages of high sensitivity, strong light resistance, and small distortion, and is beneficial to improve the quality of the image of the pressure-sensitive coating 111 obtained by the graphic acquisition unit 3 and the accuracy of the pressure information of the pressure-sensitive coating 111 obtained by the processing unit.

[0086] The pixel value range of the graphic acquisition unit 3 can be set to 30 million to 60 million, so that the image obtained by the graphic acquisition unit 3 has high definition. In some embodiments, the pixel value of the graphic acquisition unit 3 can be set to 40 million, 50 million or 60 million, and those skilled in the art can set the pixel value of the graphic acquisition unit 3 according to the actual situation. Exemplarily, the pixel value range of the graphic acquisition unit 3 can be set to 40 million to 50 million, which not only makes the image obtained by the graphic acquisition unit 3 have high definition, but also reduces the cost increase caused by using too high pixel value of the graphic acquisition unit 3.

[0087] The processing unit can be an industrial control computer, which can perform numerical calculation, logical calculation, and also has storage memory function. The processing unit can store and run the corresponding identification program of the ratio of the light intensity of the reflected light and the incident light and the pressure information to process the image collected by the graphic acquisition unit 3, so as to obtain the pressure information of the pressure-sensitive coating 111.

[0088] By communicating the processing unit with the graphic acquisition unit 3, the image of the pressure-sensitive coating 111 collected by the graphic acquisition unit 3 can be transmitted to the processing unit, so that the processing unit can process the image of the pressure-sensitive coating 111 collected by the graphic acquisition unit 3 in time.

[0089] Exemplarily, the communication connection between the processing unit and the graphic acquisition unit 3 can be wireless communication, or the processing unit and the graphic acquisition unit 3 can be connected by a data line to communicate with each other.

[0090] In some embodiments, the light-emitting unit 2 includes an ultraviolet lamp or a laser lamp.

[0091] The ultraviolet lamp can refer to a lamp capable of emitting ultraviolet light outward. The laser lamp can refer to a lamp capable of emitting laser light outward. By including an ultraviolet lamp or a laser lamp in the light-emitting unit 2, the light emitted by the light-emitting unit 2 can be used as excitation light, so that the pressure-sensitive coating 111 can better reflect the light emitted by the light-emitting unit 2 outward, which is beneficial to improve the accuracy of the pressure information obtained by the detection mechanism.

[0092] In some embodiments, the angle between the direction of the emitting end of the light emitting unit 2 and the direction of the spacing of the pressing member 11 is C, and 20°≤C≤90°.

[0093] The direction of the emitting end of the light emitting unit 2 can refer to the direction of the light emitted by the light emitting unit 2. By setting the range of the angle C between the direction of the emitting end of the light emitting unit 2 and the direction of the spacing of the pressing member 11 to be 20°≤C≤90°, the light emitted by the light emitting unit 2 can well cover the entire supporting device 1, and the plurality of pressing members 11 in the supporting device 1 can all be irradiated by the light emitted by the light emitting unit 2.

[0094] In some embodiments, 25°≤C≤90°. Exemplarily, the angle C between the direction of the emitting end of the light emitting unit 2 and the direction of the spacing of the pressing member 11 can be 30°, 45°, or 60°, not only making the light emitted by the light emitting unit 2 be able to well cover the entire supporting device 1, and the plurality of pressing members 11 in the supporting device 1 can all be irradiated by the light emitted by the light emitting unit 2, but also making the light emitting unit 2 be located at the oblique side of the supporting device 1, and not easily affecting the loading or unloading of the battery monomer 10.

[0095] In some embodiments, the angle between the direction of the collecting end of the pattern collecting unit 3 and the direction of the spacing of the pressing member 11 is D, and 20°≤D≤90°.

[0096] By setting the range of the angle D between the direction of the collecting end of the pattern collecting unit 3 and the direction of the spacing of the pressing member 11 to be 20°≤D≤90°, the collecting end of the pattern collecting unit 3 can well receive the light reflected by the entire supporting device 1, and the light reflected by the plurality of pressing members 11 in the supporting device 1 can all be collected by the pattern collecting unit 3.

[0097] In some embodiments, 25°≤D≤90°. Exemplarily, the angle C between the direction of the collecting end of the pattern collecting unit 3 and the direction of the spacing of the pressing member 11 can be 30°, 45°, or 60°, not only making the collecting end of the pattern collecting unit 3 be able to well receive the light reflected by the entire supporting device 1, and the light reflected by the plurality of pressing members 11 in the supporting device 1 can all be collected by the pattern collecting unit 3, but also making the pattern collecting unit 3 be located at the oblique side of the supporting device 1, and not easily affecting the loading or unloading of the battery monomer 10.

[0098] Exemplarily, the direction of the spacing of the pressing member 11 can be arranged along the horizontal direction, so that the supporting device is horizontally arranged, which is conducive to improving the convenience of the arrangement of the battery pressing device.

[0099] In some embodiments, the light emitting uniformity of the light emitting unit 2 is greater than 85%.

[0100] By setting the light-emitting uniformity of the light-emitting unit 2 to be greater than 85%, the light emitted by the light-emitting unit 2 is more uniform in intensity, which is conducive to making the intensity of the light obtained by the pressure-sensitive coating 111 on the plurality of pressure members 11 in the supporting device 1 more uniform, and is conducive to improving the accuracy of the pressure information measured by the detection mechanism.

[0101] The light-emitting uniformity of the light-emitting unit 2 is greater than 90%. For example, the light-emitting uniformity of the light-emitting unit 2 can be 95%, 97%, or 98%, which makes the light emitted by the light-emitting unit 2 more uniform in intensity, which is conducive to making the intensity of the light obtained by the pressure-sensitive coating 111 on the plurality of pressure members 11 in the supporting device 1 more uniform, and is conducive to improving the accuracy of the pressure information measured by the detection mechanism.

[0102] For example, the light-emitting uniformity of the light-emitting unit 2 can be determined according to the national standard GB / T 3095.3-2012 for the light emitted by the light-emitting unit 2, and the specific determination method can refer to the national standard GB / T 3095.3-2012, which will not be described here.

[0103] In some embodiments, with continued reference to FIG. 3, the pressure member 11 is provided with an abutting surface 112 for abutting the battery monomer 10, and the abutting surface 112 is configured as an arc surface convex to the space between the pressure members 11.

[0104] The abutting surface 112 can refer to a surface in the pressure member 11 for contacting and abutting the battery monomer 10, which is arranged towards the battery monomer 10. By configuring the abutting surface 112 as an arc surface convex to the space between the pressure members 11, the middle part of the large surface of the battery monomer 10 can be abutted by the middle part of the abutting surface 112 when the pressure member 11 is abutted to the battery monomer 10, while the edge part of the large surface of the battery monomer 10 is not abutted by the abutting surface 112, so that the motor assembly inside the battery monomer 10 can be better extruded while the shell of the battery monomer 10 can bear less action of the pressure member 11.

[0105] For example, the shortest distance E between the contact position of the abutting surface 112 and the edge of the large surface of the battery monomer 10 is less than or equal to 1 cm, so that the motor assembly inside the battery monomer 10 can be better extruded while the shell of the battery monomer 10 can bear less action of the pressure member 11.

[0106] In some embodiments, the pressure member 11 is configured to apply pressure to the battery monomer 10 by expansion.

[0107] The pressurizing member 11 is configured to pressurize the battery cell 10 by expansion can mean that the pressurizing member 11 is capable of pressurizing the battery cell 10 located between two adjacent pressurizing members 11 by expansion in a manner of occupying the space between the two adjacent pressurizing members 11.

[0108] In some embodiments, with continued reference to FIG. 4, the pressurizing member 11 includes a bladder 113, and the bladder 113 has a cavity 114 formed inside the bladder 113, the cavity 114 being configured to communicate with a fluid delivery mechanism, the fluid delivery mechanism being configured to deliver fluid to the cavity 114; the bladder 113 being configured to pressurize the battery cell 10.

[0109] The cavity 114 is configured to contain fluid. The fluid can mean a medium in a fluid state at room temperature, such as a gaseous medium or a liquid medium. Exemplarily, the gaseous medium can be a medium in a gaseous state at room temperature, such as air, inert gas, nitrogen, etc., and in this case the bladder 113 can be an air bladder. Exemplarily, the liquid medium can be a medium in a liquid state at room temperature, such as water, oil, etc., and in this case the bladder 113 can be a liquid bladder.

[0110] When it is necessary to pressurize the battery cell 10, the pressurizing member 11 can be connected to the fluid delivery mechanism. The fluid delivery mechanism can be directly connected to the bladder 113 to communicate with the cavity 114; alternatively, the fluid delivery mechanism can be indirectly connected to the bladder 113 through other components to communicate with the cavity 114 through the components.

[0111] The cavities 114 of the plurality of pressurizing members 11 can communicate with the same fluid delivery mechanism, or can communicate with different fluid delivery mechanisms.

[0112] The fluid delivery mechanism can only input fluid into the cavity 114. Alternatively, the fluid delivery mechanism can both input fluid into the cavity 114 and extract fluid from the cavity 114.

[0113] The pressurizing member 11 can include one bladder 113, or can include a plurality of bladders 113. In some examples, the pressurizing member 11 includes one bladder 113, and the bladder 113 can pressurize the battery cell 10 located on both sides of the bladder 113. The bladder 113 can be integrally formed, or can be assembled by a plurality of components.

[0114] The fluid delivery mechanism can fill fluid into the cavity 114 to achieve deformation of the bladder 113 by the pressure of the fluid, and then pressurize the battery cell 10 by the bladder 113. By adjusting the amount of fluid filled, the deformation of the bladder 113 can be changed, in other words, by adjusting the fluid input by the fluid delivery mechanism, the pressure applied by the bladder 113 to the battery cell 10 can be effectively controlled, thereby improving the reliability of the pressure.

[0115] The fluid pressurization method is simple, easy to operate and low in cost. In addition, the fluid pressurization involves less equipment, which can reduce the floor area and save the layout space of the plant.

[0116] In some embodiments, the fluid delivery mechanism includes a pipe connected to the fluid source.

[0117] In some embodiments, the capsule 113 can be a flexible container. The capsule 113 can be a structure that is entirely flexible or a structure that is partially flexible.

[0118] Exemplarily, the capsule 113 is used to press the part of the battery cell 10 that is flexible. When the battery cell 10 is charged or discharged, the volume of the battery cell 10 will expand and contract. The flexible part of the capsule 113 can be elastically deformed to adapt to the shape of the battery cell 10, so as to maintain the pressing of the capsule 113 on the surface of the battery cell 10, improve the uniformity of the force applied to the battery cell 10, and reduce the generation of dead angles.

[0119] In some embodiments, with reference to FIG. 3, the pressurizing member 11 further includes an interface 115 connected to the cavity 114, and the pressurizing member 11 further includes a valve body connected to the interface 115, which is used to be connected to the fluid delivery mechanism.

[0120] The interface 115 can be a structure arranged on the capsule 113 and connected to the cavity 114, which is used to be connected to the fluid delivery mechanism, so that the fluid delivery mechanism can pass the fluid into or out of the cavity 114 through the interface 115.

[0121] Optionally, the capsule 113 can be provided with a plurality of interfaces 115, which can quickly fill or discharge the fluid in the cavity 114, so as to improve the change rate of the volume of the capsule 113.

[0122] When the battery pressurization device is used, the battery cell 10 is first inserted between two adjacent capsules 113 in the case that the amount of fluid filled in the cavity 114 is small, and then the fluid is filled into the cavity 114 through the valve body and the interface 115, so that the volume of the capsule 113 is expanded and increased, and the pressure on the battery cell 10 is realized. After the treatment of the battery cell 10 is completed, the fluid in the cavity 114 can be discharged through the valve body and the interface 115, the volume of the capsule 113 is contracted and reduced, the pressing of the capsule 113 on the battery cell 10 is released, and then the battery cell 10 is taken out from between the two adjacent capsules 113.

[0123] The volume of the capsule 113 can be adjusted by setting the interface 115 and installing the valve body to adjust the amount of fluid medium filled in the cavity 114. In this way, when the battery pressurizing device is used, the interface 115 and the valve body can be used to fill the cavity 114 with fluid medium only when the battery cell 10 needs to be extruded, and the cavity 114 can be kept empty or filled with a small amount of fluid medium when the battery cell 10 is loaded and unloaded, so as to facilitate the extraction and placement of the battery cell 10. In addition, the amount of fluid filled in the cavity 114 can also be adjusted by the interface 115 and the valve body, so as to adjust the extrusion force of the capsule 113 on the battery cell 10, and reduce the appearance defects of the battery cell 10 caused by excessive force, such as the depression of the shell of the battery cell 10, or the lithium precipitation caused by insufficient force.

[0124] Since the capsule 113 can adaptively deform according to the surface shape of the battery cell 10, and the amount of fluid filled in the cavity 114 can also be adjusted by the interface 115 and the valve body, the compatibility of the battery pressurizing device with the thickness, shape and tolerance of the battery cell 10 can be improved, and the uniformity of the force applied to the battery cell 10 can be improved.

[0125] In some embodiments, the valve body can be a gas valve which can be inflated or deflated. In other embodiments, the valve body can be a liquid valve which can be filled with liquid or drained of liquid.

[0126] In some embodiments, with continued reference to FIG. 5, the pressurizing member 11 includes a capsule 113 and an inflatable body 116, the capsule 113 has a cavity 114 inside, and the inflatable body 116 is accommodated in the cavity 114; the inflatable body 116 is configured to expand under a preset condition, and the capsule 113 is used to extrude the battery cell 10.

[0127] For example, the preset condition can be different according to different design requirements. For example, the preset condition can depend on the material of the inflatable body 116.

[0128] For example, the preset condition can include at least one of temperature, voltage, light or water.

[0129] The embodiments of the present application can realize the expansion and deformation of the capsule 113 through the expansion of the inflatable body 116, and then press the battery cell 10 with the capsule 113. By controlling the expansion amount of the inflatable body 116, the pressure applied to the battery cell 10 by the capsule 113 can be effectively controlled, thereby improving the reliability of the pressure.

[0130] In some embodiments, the inflatable body 116 is configured to expand under the application of voltage or under heating.

[0131] The expandable body 116 can expand only when a voltage is applied, can expand only when heated, and can expand when both a voltage is applied and heated.

[0132] The energization and heating are easy to implement and control, which helps to simplify the structure of the battery pressurizing device.

[0133] In some embodiments, the expandable body 116 includes a charged deformation material. When charged, the charged deformation material expands; when discharged, the charged deformation material recovers or shrinks.

[0134] In some embodiments, the expandable body 116 includes at least one of a piezoelectric ceramic and a phase change material.

[0135] The piezoelectric ceramic can deform in response to an electrical signal. By applying a voltage to the piezoelectric ceramic, the piezoelectric ceramic can be expanded, and in turn, the capsule 113 can be expanded. After being discharged, the piezoelectric ceramic can recover to its original state.

[0136] When a material undergoes a phase change, its volume generally also changes. By changing the temperature, the phase change material can be controlled to undergo a phase change, thereby achieving the expansion and contraction of the capsule 113.

[0137] In some embodiments, the melting point of the capsule 113 is T, and T≥80℃.

[0138] By setting the range of the melting point T of the capsule 113 to T≥80℃, the capsule 113 has good resistance to the temperature rise of the battery cell 10 caused by charging and discharging, which is conducive to prolonging the service life of the pressurizing member 11.

[0139] In some embodiments, the Young's modulus of the capsule 113 is B, and B≥12MPa.

[0140] By setting the range of the Young's modulus B of the capsule 113 to B≥12MPa, the texture of the capsule 113 is not too soft, so that the capsule 113 can meet the requirement of elastic deformation, and it is convenient to apply sufficient pressure to the battery cell 10.

[0141] Exemplarily, the capsule 113 can be made of ethylene propylene diene rubber.

[0142] In some embodiments, in the spacing direction of the pressurizing member 11, the projection of the battery cell 10 is located within the projection range of the capsule 113.

[0143] By setting the projection of the battery cell 10 in the spacing direction of the pressurizing member 11 to be located within the projection range of the capsule 113 in the spacing direction of the pressurizing member 11, the battery cell 10 in the state of being clamped by the capsule 113 is not easy to contact other components in the pressurizing member 11, which is conducive to reducing the possibility of the battery cell 10 being damaged by knocking.

[0144] In some embodiments, the supporting device 1 further comprises a support 12, and the pressurizing member 11 further comprises a partition plate 117, the partition plate 117 is provided with an opening 1171 penetrating along the thickness direction of the partition plate 117, and the bladder 113 is connected to the opening 1171 and connected to the support 12 through the partition plate 117.

[0145] The support 12 can be a frame structure in the supporting device 1, and the plurality of pressurizing members 11 are connected to the support 12 to form an integral structure. Exemplarily, the support 12 can be made of metal or made of high-temperature-resistant engineering plastic, so that the support 12 has good rigidity and can provide stable support for the pressurizing member 11.

[0146] The partition plate 117 can be a component for fixing the bladder 113 in the pressurizing member 11, and the bladder 113 is connected to the support 12 through the partition plate 117. The opening 1171 can be a structure provided on the partition plate 117, which is used to set the bladder 113. Exemplarily, the opening 1171 can be machined on the partition plate 117 in a material-removing manner such as milling, or can be integrally formed with the partition plate 117 in a stamping manner. By opening the opening 1171 penetrating along the thickness direction of the partition plate 117, and setting the bladder 113 in the opening 1171, the bladder 113 can exert pressure on the battery monomer 10 located on both sides of the partition plate 117 when the bladder 113 expands in the opening 1171.

[0147] The embodiments of the present application further provide a battery production system, which comprises the battery pressurizing device provided by any one of the foregoing embodiments.

[0148] In some embodiments, the battery production system further comprises a fluid conveying mechanism connected to the bladder 113 and used for conveying fluid into the cavity 114 of the bladder 113.

[0149] Optionally, the fluid conveying mechanism comprises a gas conveying device.

[0150] In some embodiments, the battery production system further comprises a processing device used for performing specific processing on the battery monomer 10. For example, in some examples, the processing device can be a negative pressure device used for extracting gas inside the battery monomer 10 in the process of forming the battery monomer 10. In other examples, the processing device can be a liquid injection device used for injecting electrolyte into the inside of the battery monomer 10.

[0151] Some embodiments of the present application provide a battery pressurizing method, as shown in FIG. 6, which comprises the following steps:

[0152] S1, providing a supporting device 1, the supporting device 1 comprises a plurality of spaced pressurizing members 11.

[0153] Through the above step S1, the gap for placing the battery monomer 10 can be formed between the adjacent two pressing members 11 in the supporting device 1.

[0154] S2, provide a pressure sensitive coating 111, the pressure sensitive coating 111 is arranged on the surface of the pressing member 11 for facing the battery monomer 10.

[0155] Through the above step S2, the pressure sensitive coating 111 can be formed on the surface of the pressing member 11 for facing the battery monomer 10, so that the pressure sensitive coating 111 will have different states according to the different pressure intensity on the surface of the pressing member 11 in the process of pressing the battery monomer 10.

[0156] S3, provide a detection mechanism.

[0157] Through the above step S3, the pressure intensity information of the pressure sensitive coating 111 can be detected by the detection mechanism.

[0158] S4, the battery monomer 10 is placed in the gap between the pressing members 11.

[0159] Through the above step S4, the battery monomer 10 is placed in the gap formed between the adjacent two pressing members 11.

[0160] S5, the pressing member presses the battery monomer 10.

[0161] Through the above step S5, the adjacent two pressing members 11 extrude the battery monomer 10, so that the battery monomer 10 is pressed.

[0162] S6, the detection mechanism generates the pressure intensity information of the pressure sensitive coating 111 according to the state change of the pressure sensitive coating 111.

[0163] In the above step S6, the detection mechanism can generate the pressure intensity information of the pressure sensitive coating 111 according to the state change of the pressure sensitive coating 111, so that the pressure intensity information applied by the battery pressing device to the battery monomer 10 can be obtained smoothly.

[0164] Through the above method, the pressure intensity information applied by the battery pressing device to the battery monomer 10 can be obtained smoothly, which is convenient for adjusting the pressure intensity suffered by the battery monomer 10, so that the pressure intensity suffered by the battery monomer 10 is in a reasonable range, which not only can reduce the possibility of damaging the battery monomer 10 due to excessive pressure of the pressing member 11, but also can reduce the poor formation caused by poor exhaust due to insufficient pressure of the pressing member 11, which is beneficial to improve the formation quality of the battery monomer 10.

[0165] Some embodiments of the application provide a battery pressurizing device, which comprises a supporting device 1, a pressure-sensitive coating 111 and a detection mechanism, the detection mechanism comprising a light-emitting unit 2, a pattern acquisition unit 3 and a processing unit, the supporting device 1 comprising a plurality of pressure pieces 11 arranged at intervals, adjacent pressure pieces 11 being used to clamp and pressurize a battery monomer 10, the pressure-sensitive coating 111 being arranged on the surface of the pressure piece 11 facing the battery monomer 10, the light-emitting unit 2 being capable of emitting light to the supporting device 1, and the processing unit in communication connection with the pattern acquisition unit 3 being capable of converting the light intensity information of the image of the pressure-sensitive coating 111 acquired by the pattern acquisition unit 3 into pressure information. In the above structure, since the surface of the pressure piece 11 facing the battery monomer 10 is provided with the pressure-sensitive coating 111, and the detection mechanism is capable of generating the pressure information received by the pressure-sensitive coating 111 according to the state change of the pressure-sensitive coating 111, the pressure information applied to the battery monomer 10 by the battery pressurizing device can be successfully obtained, which facilitates the adjustment of the pressure received by the battery monomer 10, so that the pressure received by the battery monomer 10 is within a reasonable range, which not only can reduce the possibility of damaging the battery monomer 10 due to excessive pressure applied by the pressure piece 11, but also can reduce the formation failure caused by poor exhaust due to insufficient pressure applied by the pressure piece 11, and is conducive to improving the formation quality of the battery monomer 10.

[0166] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the 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 to 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 application, and they should be covered in the scope of the claims and the specification of the application. In particular, as long as there is no structural conflict, each technical feature mentioned in the embodiments can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pressurizing device, comprising: a supporting device comprising a plurality of pressurizing members arranged at intervals, and a battery cell being placed between adjacent pressurizing members, the pressurizing members being configured to pressurize the battery cell; a pressure-sensitive coating arranged on a surface of the pressurizing members facing the battery cell; a detection mechanism configured to generate pressure information of the pressure-sensitive coating according to a state change of the pressure-sensitive coating.

2. The battery pressurizing device according to claim 1, wherein The thickness of the pressure-sensitive coating is A, 0.5mm≤A≤4mm; optionally, 1mm≤A≤2mm.

3. The battery pressurizing device according to claim 1 or 2, wherein The detection mechanism comprises: a light-emitting unit configured to emit light to the supporting device; a pattern acquisition unit configured to acquire an image of the pressure-sensitive coating; a processing unit in communication with the pattern acquisition unit, the processing unit being configured to convert light intensity information of the image into pressure information.

4. The battery pressurizing device according to claim 3, wherein The light-emitting unit comprises an ultraviolet lamp or a laser lamp.

5. The battery pressurizing device according to claim 3 or 4, wherein The angle between the direction of the light-emitting end of the light-emitting unit and the interval direction of the pressurizing members is C, 20°≤C≤90°.

6. The battery pressurization device of any one of claims 3 to 5, wherein, The angle between the direction of the acquisition end of the pattern acquisition unit and the interval direction of the pressurizing members is D, 20°≤D≤90°.

7. The battery pressurizing device according to any one of claims 3 to 5, wherein The light-emitting uniformity of the light-emitting unit is greater than 85%.

8. The battery pressurization device of any one of claims 3 to 5, wherein, The pressurizing member is provided with a bearing surface configured to bear against the battery cell, the bearing surface being configured as a convex arc surface facing the interval between the pressurizing members.

9. The battery pressurization device of any one of claims 1 to 8, wherein, The pressurizing member is configured to pressurize the battery cell by swelling.

10. The battery pressurization device of claim 9, wherein, The pressurizing member comprises a capsule, the capsule being internally formed with a cavity, the cavity being configured to communicate with a fluid delivery mechanism, the fluid delivery mechanism being configured to deliver fluid to the cavity; the capsule being configured to extrude the battery cell.

11. The battery pressurization device of claim 10, wherein, The pressurizing member further comprises an interface communicating with the cavity, and a valve body connected to the interface, the valve body being configured to connect with the fluid delivery mechanism.

12. The battery pressurization device of any one of claims 1 to 11, wherein, The pressurizing member comprises a capsule and an expandable body, the capsule being internally formed with a cavity, the expandable body being accommodated in the cavity; the expandable body being configured to swell under a preset condition, and the capsule being configured to extrude the battery cell.

13. The battery pressurization device of any one of claims 10 to 12, wherein, The melting point of the capsule is T, T≥80℃.

14. The battery pressurization device of any one of claims 10 to 12, wherein, The Young's modulus of the capsule is B, B≥12MPa.

15. The battery pressurization device of any one of claims 10 to 12, wherein, In the interval direction of the pressurizing member, the projection of the battery cell is located within the projection range of the capsule.

16. The battery pressurization device of any one of claims 10 to 12, wherein, The supporting device further comprises a support, and the pressurizing member further comprises a partition plate, the partition plate being provided with an opening penetrating through the thickness direction of the partition plate, the capsule being connected to the opening and connected to the support through the partition plate. 17.A battery production system comprising the battery pressurizing device according to any one of claims 1 to 16. 18.A battery pressurizing method, comprising: providing a supporting device comprising a plurality of pressurizing members arranged at intervals; providing a pressure-sensitive coating arranged on a surface of the pressurizing members facing a battery cell; providing a detection mechanism; placing a battery cell in the gap between the pressurizing members; the pressurizing members pressurizing the battery cell; the detection mechanism generating pressure information of the pressure-sensitive coating according to a state change of the pressure-sensitive coating.

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