Laser die cutting method, device and computer storage medium for battery electrode sheet

Abstract

The application discloses a kind of laser die cutting method, device and computer storage medium of battery pole piece, the method includes: the target light source for pole piece die cutting is pumped, and initial laser is obtained;According to the laser receiving condition of preset gain device, the initial laser is spectrally resolved, and after the laser is spectrally resolved, gain is obtained by gain device, and gain laser is obtained;The pulse width compression is carried out to gain laser, and after the laser is compressed, battery pole piece is carried out laser die cutting based on compressed laser.It can be seen that, by the initial laser is spectrally resolved, gain and pulse width compression are carried out to obtain compressed laser, and the pole piece is carried out laser die cutting, not only can reduce the impact influence and thermal influence caused to pole piece when die cutting, but also can reduce the molten slag splashing and the uneven situation of cut occurs, to improve the reliability and accuracy of pole piece laser die cutting, to improve pole piece effective material area, improve battery performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery preparation, and in particular to a laser die-cutting method and device for battery pole pieces and a computer storage medium. BACKGROUND

[0002] A power battery, as a power source for the new energy vehicle industry, has always been valued by battery manufacturers in terms of preparation process. For the traditional die-cutting process of a battery pole piece, a mechanical cutting method is often used. However, in the process of mechanically cutting the battery pole piece, burrs and impurities are prone to occur on the pole piece, which seriously damages the performance of the battery. Therefore, battery manufacturers gradually replace mechanical cutting with laser cutting. However, it is found through practice that the existing laser cutting method is prone to cause uneven cutting edges, molten slag splashing, and a large heat-affected zone, which results in a low capacity of the pole piece and even causes a short circuit of the battery, and thus it is difficult to improve the performance of the battery. Therefore, it is particularly important to propose a new method for laser die-cutting of a battery pole piece. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a laser die-cutting method, device, and computer storage medium for a battery pole piece, which can not only reduce the impact and heat effects on the pole piece during die-cutting, but also reduce the occurrence of molten slag splashing and uneven cutting edges, thereby improving the reliability and accuracy of laser die-cutting of the pole piece, and improving the effective material area of the pole piece and the performance of the battery.

[0004] To solve the above technical problems, the present application discloses, in a first aspect, a laser die-cutting method for a battery pole piece, which comprises:

[0005] Pumping a target light source used for die-cutting of the pole piece to obtain an initial laser corresponding to the target light source; the pulse frequency of the initial laser is greater than or equal to a preset pulse frequency threshold, and / or the pulse width of the initial laser is less than or equal to a preset pulse width threshold;

[0006] According to a preset laser receiving condition of a gain device, performing light splitting on the initial laser to obtain split laser, and performing gain operation on the split laser by the gain device to obtain gain laser;

[0007] Performing pulse width compression on the gain laser to obtain compressed laser, and performing laser die-cutting operation on the battery pole piece based on the compressed laser.

[0008] As an optional implementation, in the first aspect of the present application, the step of performing light splitting on the initial laser to obtain split laser according to a preset laser receiving condition of a gain device comprises:

[0009] determine a die-cut interface parameter of the battery pole piece, and determine a grating parameter of each of the light-splitting gratings and a lens parameter of each of the first lenses according to the preset gain device laser receiving condition and the die-cut interface parameter; the grating parameter of each of the light-splitting gratifiers includes at least one of a slit width parameter, a slit pitch parameter, a slit number parameter, a position parameter and a surface inclination angle parameter of the light-splitting grating, and the lens parameter of each of the first lenses includes a position parameter and / or a surface inclination angle parameter of the first lens;

[0010] perform light splitting operation on the initial laser according to the grating parameters of all the light-splitting gratings and the lens parameters of all the first lenses to obtain a light-splitting laser.

[0011] As an optional implementation, in the first aspect of the present application, the determination of the die-cut interface parameter of the battery pole piece includes:

[0012] determine a material parameter of the battery pole piece, and determine a material attribute parameter of the battery pole piece according to the material parameter; the material attribute parameter of the battery pole piece includes a material heat transfer efficiency parameter and / or a material gasification temperature parameter of the battery pole piece;

[0013] determine a processing requirement parameter of the battery pole piece, and determine a die-cut interface parameter of the battery pole piece according to the material attribute parameter and the processing requirement parameter; the processing requirement parameter of the battery pole piece includes at least one of a shape requirement parameter, a wiring requirement parameter and a flatness requirement parameter of the battery pole piece, and the die-cut interface parameter of the battery pole piece includes at least one of a die-cut depth parameter, a die-cut inclination angle parameter, a die-cut area parameter, a die-cut time length parameter, a die-cut temperature parameter and a die-cut efficiency parameter of the battery pole piece.

[0014] As an optional implementation, in the first aspect of the present application, the gain operation on the light-splitting laser by the gain device to obtain a gain laser includes:

[0015] according to a preset laser modulation parameter, add a target field corresponding to the laser modulation parameter to a gain medium in the gain device to obtain an added gain medium, and perform population inversion operation on the light-splitting laser by the added gain medium to obtain a population inversion laser; the laser modulation parameter includes a laser modulation type parameter and / or a laser modulation amplitude parameter, and the target field includes at least one of an electric field, a magnetic field and an acoustic wave field;

[0016] perform photon confinement operation on the population inversion laser by a resonant cavity in the gain device to obtain a gain laser.

[0017] As an optional implementation, in the first aspect of the present application, the spectrally split post-laser light comprises a plurality of target laser lights, each of which has a corresponding phase parameter and / or frequency parameter, and the gain post-laser light comprises all the target laser lights after being amplified by the gain device;

[0018] The pulse width compression operation on the gain post-laser light comprises:

[0019] The grating parameters of each target grating and the lens parameters of each second lens in the preset pulse compression device are determined; the grating parameters of each target grating include at least one of the slit width parameter, the slit pitch parameter, the slit number parameter, the position parameter, the face tilt angle parameter and the polarity parameter of the target grating, and the lens parameters of each second lens include the position parameter and / or the face tilt angle parameter of the second lens.

[0020] According to the grating parameters of all the target gratings and the lens parameters of all the second lenses, the pulse width compression operation is performed on all the target laser lights after being amplified by the gain device to obtain all the target laser lights after being compressed as the compressed post-laser light; the phase parameters of all the target laser lights after being compressed match.

[0021] As an optional implementation, in the first aspect of the present application, the determination of the grating parameters of each target grating and the lens parameters of each second lens in the preset pulse compression device comprises:

[0022] According to the die-cut interface parameters of the battery electrode piece determined in advance, the peak power demand parameters corresponding to the gain post-laser light are determined, and according to the peak power demand parameters, the pulse compression demand parameters corresponding to the preset pulse compression device are determined.

[0023] According to the pulse compression demand parameters, the grating parameters of each target grating and the lens parameters of each second lens in the pulse compression device are determined.

[0024] As an optional implementation, in the first aspect of the present application, the target light source is determined by the following way:

[0025] The type parameter of the preset gain device and the wavelength parameter of a plurality of pending light sources are determined;

[0026] According to the type parameter of the gain device and the wavelength parameter of each pending light source, the light absorption degree of the gain device to each pending light source is determined.

[0027] According to the light absorption degree of each of the to-be-determined light sources, a to-be-determined light source with a light absorption degree greater than or equal to a preset light absorption degree threshold is determined from all the to-be-determined light sources as a target light source for the tab die-cutting.

[0028] The second aspect of the present application discloses a laser die-cutting device for a battery tab, comprising:

[0029] a pump module for performing a pumping operation on the target light source for the tab die-cutting to obtain an initial laser corresponding to the target light source; the initial laser has a pulse frequency greater than or equal to a preset pulse frequency threshold, and / or the initial laser has a pulse width less than or equal to a preset pulse width threshold;

[0030] a first laser processing module for performing a light splitting operation on the initial laser according to a preset laser receiving condition of a gain device to obtain split light, and performing a gain operation on the split light by the gain device to obtain gain light;

[0031] a second laser processing module for performing a pulse width compression operation on the gain light to obtain compressed light;

[0032] a die-cutting module for performing a laser die-cutting operation on the battery tab based on the compressed light.

[0033] As an optional implementation, in the second aspect of the present application, the first laser processing module performs a light splitting operation on the initial laser according to a preset laser receiving condition of a gain device to obtain split light in a manner that specifically comprises:

[0034] determining a die-cutting interface parameter of the battery tab, and determining a grating parameter of each light splitting grating for light splitting and a lens parameter of each first lens for reflection according to the laser receiving condition of the gain device and the die-cutting interface parameter; the grating parameter of each light splitting grating comprises at least one of a slit width parameter, a slit pitch parameter, a slit number parameter, a position parameter, and a face inclination angle parameter of the light splitting grating, and the lens parameter of each first lens comprises a position parameter and / or a face inclination angle parameter of the first lens;

[0035] performing a light splitting operation on the initial laser according to the grating parameters of all the light splitting gratings and the lens parameters of all the first lenses to obtain split light.

[0036] As an optional implementation, in the second aspect of the present application, the first laser processing module determines the die-cutting interface parameter of the battery tab in a manner that specifically comprises:

[0037] determining a material parameter of the battery pole piece, and determining a material attribute parameter of the battery pole piece according to the material parameter; the material attribute parameter of the battery pole piece includes a material heat transfer efficiency parameter and / or a material gasification temperature parameter of the battery pole piece;

[0038] determining a processing requirement parameter of the battery pole piece, and determining a die-cutting interface parameter of the battery pole piece according to the material attribute parameter and the processing requirement parameter; the processing requirement parameter of the battery pole piece includes at least one of a shape requirement parameter, a wiring requirement parameter and a flatness requirement parameter of the battery pole piece, and the die-cutting interface parameter of the battery pole piece includes at least one of a die-cutting depth parameter, a die-cutting inclination angle parameter, a die-cutting area parameter, a die-cutting time length parameter, a die-cutting temperature parameter and a die-cutting efficiency parameter of the battery pole piece.

[0039] As an optional implementation form, in the second aspect, the first laser processing module performs gain operation on the split laser by the gain device to obtain the gain laser.

[0040] According to a preset laser modulation parameter, a target field corresponding to the laser modulation parameter is added to a gain medium in the gain device to obtain an added gain medium, and the split laser is subjected to population inversion operation by the added gain medium to obtain a population inversion laser; the laser modulation parameter includes a laser modulation type parameter and / or a laser modulation amplitude parameter, and the target field includes at least one of an electric field, a magnetic field and an acoustic wave field.

[0041] The population inversion laser is subjected to photon confinement operation by a resonant cavity in the gain device to obtain the gain laser.

[0042] As an optional implementation form, in the second aspect, the split laser includes a plurality of target lasers, each of the target lasers has a corresponding phase parameter and / or a frequency parameter, and the gain laser includes all the target lasers after gain operation by the gain device.

[0043] The second laser processing module performs pulse width compression operation on the gain laser to obtain the compressed laser.

[0044] determining a grating parameter of each target grating in a preset pulse compression device and a lens parameter of each second lens; the grating parameter of each target grating includes at least one of a slit width parameter, a slit spacing parameter, a slit number parameter, a position parameter, a face inclination angle parameter and a polarity parameter of the target grating, and the lens parameter of each second lens includes a position parameter and / or a face inclination angle parameter of the second lens.

[0045] According to the grating parameters of all the target gratings and the lens parameters of all the second lenses, pulse width compression operations are performed on all the target lasers after gain, so as to obtain compressed target lasers as compressed lasers; the phase parameters of the compressed target lasers match.

[0046] As an optional implementation, in the second aspect of the present application, the manner in which the second laser processing module determines the grating parameters of each target grating and the lens parameters of each second lens in the preset pulse compression device is specifically as follows:

[0047] According to the die-cut interface parameters of the battery pole piece determined in advance, the peak power requirement parameters corresponding to the laser after gain are determined, and according to the peak power requirement parameters, the pulse compression requirement parameters corresponding to the preset pulse compression device are determined;

[0048] According to the pulse compression requirement parameters, the grating parameters of each target grating and the lens parameters of each second lens in the pulse compression device are determined.

[0049] As an optional implementation, in the second aspect of the present application, the target light source is determined by the following manner:

[0050] The type parameter of the preset gain device and the wavelength parameter of a plurality of pending light sources are determined;

[0051] According to the type parameter of the gain device and the wavelength parameter of each of the pending light sources, the light absorption degree of each of the pending light sources by the gain device is determined;

[0052] According to the light absorption degree of each of the pending light sources by the gain device, the pending light source with a light absorption degree greater than or equal to a preset light absorption threshold is determined from all the pending light sources as a target light source for pole piece die cutting.

[0053] The third aspect of the present application discloses another laser die cutting device for a battery pole piece, which comprises:

[0054] A memory storing executable program codes;

[0055] A processor coupled with the memory;

[0056] The processor invokes the executable program codes stored in the memory to execute the laser die cutting method for a battery pole piece disclosed in the first aspect of the present application.

[0057] The fourth aspect of the present application discloses a computer storage medium, the computer storage medium stores computer instructions, when the computer instructions are called, the computer instructions are used to execute the laser die cutting method of the battery pole piece disclosed in the first aspect of the present application.

[0058] Compared with the prior art, the embodiment of the present application has the following beneficial effects:

[0059] In the embodiment of the present application, the target light source for pole piece die cutting is pumped to obtain initial laser; the initial laser is split according to the preset laser receiving condition of the gain device to obtain split laser, and the split laser is subjected to gain through the gain device to obtain gain laser; the gain laser is subjected to pulse width compression to obtain compressed laser, and the battery pole piece is subjected to laser die cutting based on the compressed laser. It can be seen that, by implementing the present application, the pole piece is subjected to laser die cutting after the initial laser is split, gain and pulse width compression to obtain the compressed laser, which not only can reduce the impact and thermal effects on the pole piece during die cutting, but also can reduce the molten slag splashing and uneven cutting, thereby improving the reliability and accuracy of the laser die cutting of the pole piece to improve the effective material area of the pole piece and improve the battery performance. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0061] Figure 1 is a flowchart of a laser die cutting method of a battery pole piece disclosed by the embodiment of the present application;

[0062] Figure 2 is a flowchart of another laser die cutting method of a battery pole piece disclosed by the embodiment of the present application;

[0063] Figure 3 is a structural schematic diagram of a laser die cutting device of a battery pole piece disclosed by the embodiment of the present application;

[0064] Figure 4 is a structural schematic diagram of another laser die cutting device of a battery pole piece disclosed by the embodiment of the present application;

[0065] Figure 5 is a laser generation schematic diagram for battery pole piece die cutting disclosed by the embodiment of the present application;

[0066] Figure 6 is an effect schematic diagram of laser die cutting disclosed by the embodiment of the present application. DETAILED DESCRIPTION

[0067] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiment of the present application will be described clearly and completely in the following combined with the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, not all. Based on the embodiment in the present application, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the present application.

[0068] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish different objects, not to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or end including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or end.

[0069] In this paper, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0070] The present application discloses a kind of laser die cutting method, device and computer storage medium of battery pole piece, not only can reduce the impact influence and thermal influence caused to pole piece when die cutting, also can reduce the molten slag splashing and the situation of uneven cut, to improve the reliability and accuracy of pole piece laser die cutting, to improve pole piece effective material area, improve battery performance.

[0071] Embodiment one

[0072] Please refer to Figure 1 , Figure 1 It is a flowchart of the laser die cutting method of the battery pole piece disclosed in the embodiment of the present application. Among them, Figure 1The described laser die-cutting method of the battery pole piece can be applied to laser die-cutting of various types of battery pole pieces, such as manganese-zinc batteries, lithium-ion batteries, nickel-cadmium batteries, etc., and the embodiments of the present application are not limited. Optionally, the method can be implemented by a laser die-cutting control system, which can be integrated in a laser die-cutting control device, or a local server or cloud server for processing the laser die-cutting process of the battery pole piece, and the embodiments of the present application are not limited. As shown in Figure 1 The laser die-cutting method of the battery pole piece can include the following operations:

[0073] 101, pump the target light source for pole piece die-cutting to obtain initial laser corresponding to the target light source.

[0074] In the embodiments of the present application, optionally, the target light source can be a green light source, a yellow light source, and a blue light source, etc., which can be determined based on the gain medium laser receiving conditions in the preset gain device. Further optionally, the pulse frequency of the obtained initial laser is greater than or equal to a preset pulse frequency threshold, and / or the pulse width of the initial laser is less than or equal to a preset pulse width threshold, wherein the pulse frequency threshold can be 1MHz, and the pulse width threshold can be 350fs. For example, a green light source with a wavelength of 517±5nm can be pumped to generate femtosecond laser pulses with a pulse frequency of 1MHz and a pulse width of 300fs.

[0075] Further, as an optional embodiment, the target light source is determined by the following method:

[0076] Determine the type parameter of the preset gain device and the wavelength parameter of the plurality of undetermined light sources;

[0077] According to the type parameter of the gain device and the wavelength parameter of each undetermined light source, determine the light absorption of the gain device to each undetermined light source;

[0078] According to the light absorption of the gain device to each undetermined light source, determine the undetermined light source with light absorption greater than or equal to a preset light absorption threshold from all undetermined light sources as the target light source for pole piece die-cutting.

[0079] In this optional embodiment, generally, the determination of the pumped light source is limited by the light source absorption characteristics of the gain medium in the preset gain device, such as only absorbing light sources with a specific wavelength, so that it is necessary to determine the undetermined light source with a certain light absorption as the target light source for pumping and subsequent gain.

[0080] 102, according to the laser receiving conditions of the preset gain device, perform light splitting operation on the initial laser to obtain split laser, and perform gain operation on the split laser through the gain device to obtain gain laser.

[0081] In the embodiment of the present application, the initial laser can be split by a pulse stretching device, wherein the corresponding grating and lens are integrated in the pulse stretching device; in addition, the gain device for gain is integrated with the corresponding gain medium and resonant cavity (such as Figure 5 , Figure 5 is a schematic diagram of laser generation for battery pole piece die cutting disclosed by the embodiment of the present application). Specifically, the split laser includes multiple target lasers, and each target laser has corresponding phase parameters and / or frequency parameters, such as a low-frequency laser with different phase parameters and a high-frequency laser, wherein splitting the initial laser can achieve the effects of widening the pulse width of the initial laser and reducing the peak power. Specifically, the gain laser includes all target lasers after gain by the gain device.

[0082] 103, performing a pulse width compression operation on the gain laser to obtain a compressed laser, and performing a laser die cutting operation on the battery pole piece based on the compressed laser.

[0083] In the embodiment of the present application, as shown in Figure 5 , the gain laser can be pulse width compressed by a pulse width compression device, wherein the pulse width compression device is also integrated with the corresponding grating and lens to eliminate the phase difference between all target lasers after gain and improve the peak power of the overall laser.

[0084] It should be noted that, as shown in Figure 6 , Figure 6 is an effect diagram of laser die cutting disclosed by the embodiment of the present application. In the current laser die cutting process, the laser is usually microsecond or nanosecond, but the pulse width of the current microsecond and nanosecond laser is wide, which causes uneven cutting, spatter of slag, and large heat-affected zone (as shown in the left part of Figure 6 ), thereby reducing the capacity that the positive and negative pole pieces can play and causing the risk of battery short circuit in the later assembly manufacturing process. Therefore, the embodiment of the present application adopts femtosecond die cutting process, and the ultrafast laser pulse frequency can significantly improve the laser energy to achieve the precision of local processing and reduce the occurrence of fusion, slag, and heat-affected zone (as shown in the right part of Figure 6 ), which can better improve the consistency of the pole piece in the future pole piece manufacturing process, and has an important role in reducing the battery internal resistance, ensuring the effective capacity, and reducing the risk of short circuit.

[0085] It can be seen that by implementing the embodiment of the present application, the initial laser is split, gain and pulse width compression are performed to obtain compressed laser, and the pole piece is laser die-cut, which can not only reduce the impact and thermal influence on the pole piece during die-cutting, but also reduce the molten slag splashing and uneven cutting, thereby improving the reliability and accuracy of laser die-cutting of the pole piece, and improving the effective material area of the pole piece and the battery performance.

[0086] In an optional embodiment, the step 102 of splitting the initial laser according to the preset laser receiving condition of the gain device to obtain split laser includes:

[0087] The die-cut interface parameters of the battery pole piece are determined, and the grating parameters of each split grating for splitting and the lens parameters of each first lens for reflecting are determined according to the preset laser receiving condition of the gain device and the die-cut interface parameters;

[0088] The initial laser is split according to the grating parameters of all split gratings and the lens parameters of all first lenses to obtain split laser.

[0089] In this optional embodiment, as shown in Figure 5 The splitting operation is performed through the half-reflection lens, the grating of the pulse stretching device and the lens, which can cause the high-frequency and low-frequency lasers to have a phase difference or different optical paths, widen the initial laser pulse width, and then disperse the total energy of the initial laser, thereby avoiding the laser exceeding the laser energy threshold that the gain medium can receive from damaging the gain medium. Optionally, the grating parameters of each split grating include at least one of the slit width parameter, the slit spacing parameter, the slit number parameter, the position parameter and the face inclination angle parameter of the split grating. Further optionally, the lens parameters of each first lens include the position parameter and / or the face inclination angle parameter of the first lens.

[0090] Further, in addition to the preset laser receiving condition of the gain device and the die-cut interface parameters, the wavelength parameters of the initial laser can be further combined to determine the grating parameters of each split grating for splitting and the lens parameters of each first lens for reflecting.

[0091] It can be seen that the optional embodiment can determine the grating parameters of the split grating and the lens parameters of the first lens based on the die-cut interface parameters of the battery pole piece and the laser receiving condition of the gain device, so that the initial laser is split by the split grating and the first lens, which is conducive to improving the reliability and accuracy of the splitting operation of the initial laser, thereby reducing the damage of the split laser to the gain device, thereby protecting the gain device and improving the reliability and accuracy of subsequent laser die-cutting of the battery pole piece.

[0092] In another optional embodiment, the determining the die-cut interface parameter of the battery tab in the above step comprises:

[0093] determining a material parameter of the battery tab, and determining a material attribute parameter of the battery tab according to the material parameter;

[0094] determining a processing requirement parameter of the battery tab, and determining the die-cut interface parameter of the battery tab according to the material attribute parameter and the processing requirement parameter.

[0095] In this optional embodiment, the subsequent adjustment of the frequency and energy of the initial laser (corresponding to the subsequent light splitting operation and gain operation) is realized by the material parameter and the processing requirement parameter of the battery tab, so as to realize the die-cutting operation of the battery tab. Optionally, the material attribute parameter of the battery tab includes at least one of a material heat transfer efficiency parameter and / or a material gasification temperature parameter of the battery tab. Further optionally, the processing requirement parameter of the battery tab includes at least one of a shape requirement parameter, a wiring requirement parameter, and a flatness requirement parameter of the battery tab, and the die-cut interface parameter of the battery tab includes at least one of a die-cut depth parameter, a die-cut inclination angle parameter, a die-cut area parameter, a die-cut time length parameter, a die-cut temperature parameter, and a die-cut efficiency parameter of the battery tab.

[0096] As can be seen, the optional embodiment can determine the die-cut interface parameter of the battery tab based on the material parameter and the processing requirement parameter of the battery tab, so as to realize the subsequent light splitting and gain operation of the initial laser based on the die-cut interface parameter of the battery tab. In this way, the determination reliability and accuracy of the die-cut interface parameter of the battery tab can be improved, and then the reliability and accuracy of the subsequent light splitting and gain operation of the initial laser can be improved, so that the die-cutting reliability and accuracy of the battery tab can be improved while the battery tab is protected from being damaged.

[0097] Embodiment Two

[0098] Please refer to Figure 2 , Figure 2 is a flowchart of a battery tab laser die-cutting method disclosed by an embodiment of the present application. Wherein, Figure 2 The battery tab laser die-cutting method described can be applied to laser die-cutting of various types of battery tabs, such as manganese-zinc batteries, lithium-ion batteries, nickel-cadmium batteries, etc., and the present application embodiment is not limited. Optionally, the method can be realized by a laser die-cutting control system, which can be integrated in a laser die-cutting control device, or can be a local server or a cloud server for processing the laser die-cutting process of the battery tab, etc., and the present application embodiment is not limited. As shown in Figure 2 The battery tab laser die-cutting method can include the following operations:

[0099] 201, pump the target light source for the pole piece die cutting to obtain the initial laser corresponding to the target light source.

[0100] 202, according to the preset gain device laser receiving condition, the initial laser is split to obtain the split laser.

[0101] 203, according to the preset laser modulation parameter, the target field corresponding to the laser modulation parameter is added to the gain medium in the gain device to obtain the added gain medium, and the split laser is subjected to the particle number inversion operation through the added gain medium to obtain the particle number inversion laser.

[0102] In the embodiment of the application, the laser with reduced peak power (split laser) is input into the gain system, and the split laser is subjected to particle number inversion in the resonant device, such as titanium-doped sapphire gain medium, to increase the laser energy. Optionally, the laser modulation parameter includes at least one of laser modulation type parameter and / or laser modulation amplitude parameter, and the target field includes at least one of electric field, magnetic field and acoustic wave field. Specifically, the pulse width and power of the laser are adjusted by the active Q-switching mode, wherein the active Q-switching mode includes acousto-optic Q-switching, electro-optic Q-switching and magneto-optic Q-switching, etc. Taking the electro-optic Q-switching as an example, the Q value can be controlled by applying an electric field on the gain medium by using the photoelectric effect of the crystal, so as to achieve the adjustment effect of the split laser.

[0103] 204, the photon of the particle number inversion laser is constrained by the resonant cavity in the gain device to obtain the gain laser.

[0104] In the embodiment of the application, the resonant cavity in the gain device can constrain the photon direction of the particle number inversion laser to form a stable and high-energy femtosecond laser beam.

[0105] 205, the gain laser is subjected to pulse width compression operation to obtain the compressed laser, and the battery pole piece is subjected to laser die cutting operation based on the compressed laser.

[0106] In the embodiment of the application, for other descriptions of steps 201, 202 and 205, please refer to the detailed description of steps 101-103 in embodiment one, and the embodiment of the application will not be described again.

[0107] It can be seen that by implementing the embodiment of the application, the split laser can be modulated by the preset laser modulation parameter to obtain the particle number inversion laser, and then the photon of the particle number inversion laser is constrained by the resonant cavity, so that the high-energy and stable gain laser can be accurately formed, and then the subsequent accurate pulse width compression of the gain laser is facilitated, so that the die cutting process of the battery pole piece can be smoothly carried out.

[0108] In an optional embodiment, the pulse width compression operation on the gain laser in step 205 above to obtain the compressed laser includes:

[0109] determining grating parameters of each target grating in the preset pulse compression device and lens parameters of each second lens;

[0110] performing pulse width compression operation on all target gain lasers according to the grating parameters of all target gratings and the lens parameters of all second lenses to obtain all target compressed lasers as compressed lasers.

[0111] In this optional embodiment, as shown in Figure 5 the long pulse laser with greater energy (gain laser) is input into the pulse width compression system to improve the peak power of the input laser. Optionally, the grating parameters of each target grating include at least one of the slit width parameter, the slit spacing parameter, the slit number parameter, the position parameter, the face tilt angle parameter, and the polarity parameter of the target grating, and the lens parameters of each second lens include the position parameter and / or the face tilt angle parameter of the second lens. When the grating parameters of each target grating include the polarity parameter of the target grating and the number of all target gratings is two, the polarities of the two target gratings are opposite to eliminate the optical path difference / phase difference between the low-frequency pulse and the high-frequency pulse, thereby achieving the effect of improving the peak power of the laser. Specifically, the phase parameters of all target compressed lasers match, i.e., there is no phase difference or a small phase difference between all target compressed lasers.

[0112] It can be seen that this optional embodiment can determine the grating parameters of the target grating and the lens parameters of the second lens, and perform pulse width compression on the gain laser to obtain high-energy and stable compressed laser. This is beneficial to improve the reliability and accuracy of the obtained compressed laser, and further beneficial to improve the reliability and accuracy of the subsequent battery electrode sheet die cutting operation, thereby obtaining a battery electrode sheet with less damage, a flat and effective material area, and improved battery performance.

[0113] In another optional embodiment, the determination of the grating parameters of each target grating in the preset pulse compression device and the lens parameters of each second lens in the above step includes:

[0114] determining the peak power requirement parameter corresponding to the gain laser according to the die cutting interface parameters of the battery electrode sheet, and determining the pulse compression requirement parameter corresponding to the preset pulse compression device according to the peak power requirement parameter;

[0115] According to the pulse compression requirement parameters, the grating parameters of each target grating in the pulse compression device and the lens parameters of each second lens are determined.

[0116] In the optional embodiment, at least one of the die cutting depth parameters, the die cutting inclination angle parameters, the die cutting area parameters, the die cutting time length parameters, the die cutting temperature parameters and the die cutting efficiency parameters of the required battery pole piece are used to determine the corresponding peak power requirement of the gain laser after pulse width compression, and then the pulse compression requirement parameters required by the pulse compression device are determined based on the peak power requirement, so as to configure the target grating and the second lens in the pulse compression device.

[0117] It can be seen that the optional embodiment can realize the configuration of the target grating and the second lens in the pulse compression device based on the die cutting interface parameters of the battery pole piece, so as to facilitate the subsequent reliable and accurate pulse width compression operation of the gain laser, thereby realizing the reliable and accurate cutting of the battery pole piece under the condition of ensuring the die cutting safety of the battery pole piece, and meeting the subsequent packaging requirements of the battery.

[0118] Embodiment three

[0119] Please refer to Figure 3 , Figure 3 is a structural schematic diagram of a battery pole piece laser die cutting device disclosed by the embodiment of the present application. As shown in Figure 3 , the battery pole piece laser die cutting device can include:

[0120] The pump module 301 is used for pumping operation on a target light source for pole piece die cutting, to obtain initial laser corresponding to the target light source.

[0121] The first laser processing module 302 is used for splitting operation on the initial laser according to preset laser receiving conditions of the gain device, to obtain split laser, and gain operation on the split laser through the gain device, to obtain gain laser.

[0122] The second laser processing module 303 is used for pulse width compression operation on the gain laser, to obtain compressed laser.

[0123] The die cutting module 304 is used for laser die cutting operation on the battery pole piece based on the compressed laser.

[0124] In the embodiment of the present application, the pulse frequency of the initial laser is greater than or equal to a preset pulse frequency threshold, and / or the pulse width of the initial laser is less than or equal to a preset pulse width threshold; the split laser includes multiple target lasers, each target laser has corresponding phase parameters and / or frequency parameters, and the gain laser includes all target lasers after gain operation through the gain device.

[0125] Further, as an optional implementation, the target light source is determined by the following manner:

[0126] determining the type parameter of the preset gain device and the wavelength parameter of the plurality of undetermined light sources;

[0127] determining the light absorption degree of the gain device to each undetermined light source according to the type parameter of the gain device and the wavelength parameter of each undetermined light source;

[0128] determining the undetermined light source with the light absorption degree greater than or equal to a preset light absorption degree threshold from all the undetermined light sources as the target light source for the pole piece die-cutting according to the light absorption degree of the gain device to each undetermined light source.

[0129] It can be seen that the implementation Figure 3 The described laser die-cutting device for battery pole pieces can obtain compressed laser after splitting, gain and pulse width compression of the initial laser, and then perform laser die-cutting on the pole pieces, which not only can reduce the impact and thermal effects on the pole pieces during die-cutting, but also can reduce the molten slag splashing and uneven cutting, thereby improving the reliability and accuracy of the laser die-cutting on the pole pieces, and improving the effective material area of the pole pieces and the battery performance.

[0130] In an optional embodiment, the first laser processing module 302 splits the initial laser to obtain the split laser according to the preset laser receiving condition of the gain device in the following manner:

[0131] determining the die-cutting interface parameter of the battery pole piece, and determining the grating parameter of each split grating for splitting and the lens parameter of each first lens for reflecting according to the laser receiving condition of the preset gain device and the die-cutting interface parameter;

[0132] splitting the initial laser according to the grating parameter of all the split gratings and the lens parameter of all the first lenses to obtain the split laser.

[0133] In this optional embodiment, the grating parameter of each split grating includes at least one of the slit width parameter, the slit pitch parameter, the slit number parameter, the position parameter and the face inclination angle parameter of the split grating, and the lens parameter of each first lens includes the position parameter and / or the face inclination angle parameter of the first lens.

[0134] It can be seen that the implementation Figure 3The laser cutting device for the battery pole piece described can determine the grating parameters of the light splitting grating and the lens parameters of the first lens based on the cutting interface parameters of the battery pole piece and the laser receiving conditions of the gain device, so that the initial laser is split by the light splitting grating and the first lens. In this way, it is beneficial to improve the reliability and accuracy of the initial laser splitting operation, thereby reducing the damage to the gain device caused by the split laser, thereby protecting the gain device and improving the reliability and accuracy of subsequent laser cutting of the battery pole piece.

[0135] In another optional embodiment, the first laser processing module 302 determines the cutting interface parameters of the battery pole piece in the following manner:

[0136] Determine the material parameters of the battery pole piece, and determine the material attribute parameters of the battery pole piece according to the material parameters;

[0137] Determine the processing requirement parameters of the battery pole piece, and determine the cutting interface parameters of the battery pole piece according to the material attribute parameters and the processing requirement parameters.

[0138] In this optional embodiment, the material attribute parameters of the battery pole piece include the material heat transfer efficiency parameters and / or material vaporization temperature parameters of the battery pole piece; the processing requirement parameters of the battery pole piece include at least one of the shape requirement parameters, the wiring requirement parameters, and the flatness requirement parameters of the battery pole piece; and the cutting interface parameters of the battery pole piece include at least one of the cutting depth parameters, the cutting inclination angle parameters, the cutting area parameters, the cutting time parameters, the cutting temperature parameters, and the cutting efficiency parameters of the battery pole piece.

[0139] It can be seen that the implementation Figure 3 The laser cutting device for the battery pole piece described can determine the cutting interface parameters of the battery pole piece based on the material parameters and the processing requirement parameters of the battery pole piece, so as to realize subsequent splitting and gain operations of the initial laser based on the cutting interface parameters of the battery pole piece. In this way, the determination reliability and accuracy of the cutting interface parameters of the battery pole piece can be improved, thereby improving the reliability and accuracy of subsequent splitting and gain operations of the initial laser, so as to protect the battery pole piece from damage while improving the cutting reliability and accuracy of the battery pole piece.

[0140] In yet another optional embodiment, the first laser processing module 302 performs gain operation on the split laser by the gain device in the following manner:

[0141] According to the preset laser modulation parameters, the target field corresponding to the laser modulation parameters is added to the gain medium in the gain device to obtain an added gain medium, and the particle number inversion operation is performed on the split laser by the added gain medium to obtain a particle number inversion laser.

[0142] The gain laser is obtained by photon confinement operation of the population-inverted laser through the resonant cavity in the gain device.

[0143] In the optional embodiment, the laser modulation parameter includes a laser modulation type parameter and / or a laser modulation amplitude parameter, and the target field includes at least one of an electric field, a magnetic field, and an acoustic wave field.

[0144] It can be seen that the implementation Figure 3 The described laser cutting device for battery pole piece can modulate the split laser through the preset laser modulation parameter to obtain the population-inverted laser, and then perform photon confinement on the population-inverted laser through the resonant cavity. In this way, the gain laser with high energy and stability can be accurately formed, and the subsequent precise pulse width compression of the gain laser can be facilitated, so that the laser cutting process of the battery pole piece can be smoothly performed.

[0145] In yet another optional embodiment, the second laser processing module 303 performs pulse width compression operation on the gain laser to obtain the compressed laser in the following manner:

[0146] The grating parameters of each target grating and the lens parameters of each second lens in the preset pulse compression device are determined;

[0147] The gain laser is compressed in pulse width according to the grating parameters of all target gratings and the lens parameters of all second lenses to obtain all target lasers compressed in pulse width as the compressed laser.

[0148] In the optional embodiment, the grating parameters of each target grating include at least one of a slit width parameter, a slit pitch parameter, a slit number parameter, a position parameter, a face tilt angle parameter, and a polarity parameter of the target grating, and the lens parameters of each second lens include a position parameter and / or a face tilt angle parameter of the second lens; the phase parameters of all target lasers compressed in pulse width are matched.

[0149] It can be seen that the implementation Figure 3 The described laser cutting device for battery pole piece can perform pulse width compression on the gain laser by determining the grating parameters of the target grating and the lens parameters of the second lens to obtain the compressed laser with high energy and stability. In this way, the reliability and accuracy of the obtained compressed laser can be improved, and the reliability and accuracy of the subsequent cutting operation of the battery pole piece can be improved, so that the battery pole piece with less damage, smooth incision, and larger effective material area can be obtained to improve the performance of the battery.

[0150] In yet another optional embodiment, the second laser processing module 303 determines the manner of presetting the grating parameters of each target grating in the pulse compression device and the lens parameters of each second lens as follows:

[0151] According to the predetermined die-cut interface parameters of the battery pole piece, the peak power requirement parameters corresponding to the gain laser are determined, and according to the peak power requirement parameters, the pulse compression requirement parameters corresponding to the preset pulse compression device are determined.

[0152] According to the pulse compression requirement parameters, the grating parameters of each target grating in the pulse compression device and the lens parameters of each second lens are determined.

[0153] It can be seen that the implementation Figure 3 The laser die-cutting device for battery pole pieces described can configure the target gratings and the second lenses in the pulse compression device based on the die-cut interface parameters of the battery pole pieces, so as to facilitate subsequent reliable and accurate pulse width compression operations on the gain laser, thereby realizing reliable and accurate cutting of the battery pole pieces while ensuring the safety of the die-cutting of the battery pole pieces, to meet the subsequent packaging requirements of the battery.

[0154] Embodiment Four

[0155] Please refer to Figure 4 , Figure 4 is another structural schematic diagram of a laser die-cutting device for battery pole pieces disclosed by the embodiments of the present application. As Figure 4 shown, the laser die-cutting device for battery pole pieces can include:

[0156] a memory 401 storing executable program codes;

[0157] a processor 402 coupled with the memory 401;

[0158] The processor 402 invokes the executable program codes stored in the memory 401 to execute the steps in the laser die-cutting method for battery pole pieces described in the first embodiment of the present application or the second embodiment of the present application.

[0159] Embodiment Five

[0160] The embodiments of the present application disclose a computer storage medium storing computer instructions, which, when invoked, are used to execute the steps in the laser die-cutting method for battery pole pieces described in the first embodiment of the present application or the second embodiment of the present application.

[0161] Embodiment Six

[0162] The embodiment of the present application discloses a computer program product, which comprises a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute the steps in the laser die-cutting method of the battery pole piece described in embodiment one or embodiment two.

[0163] The device embodiments described above are only schematic, wherein the modules described as separate components can or can not be physically separated, and the components displayed as modules can or can not be physical modules, i.e., can be located in one place or distributed on multiple network modules. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement it without creative labor.

[0164] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software and the necessary general hardware platform, and of course, it can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of software products, and the computer software product can be stored in a computer readable storage medium, including a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magnetic disk storage, a magnetic tape storage, or any other computer readable medium that can be used to carry or store data.

[0165] Finally, it should be noted that: the battery pole piece laser die cutting method, device and computer storage medium disclosed by the embodiment of the application disclosed only as the preferred embodiment of the application, only for the description of the technical solutions of the application, not to limit; although the application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand; the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A laser die-cutting method for battery electrodes, characterized in that, The method includes: A pumping operation is performed on the target light source used for electrode die cutting to obtain an initial laser corresponding to the target light source; the pulse frequency of the initial laser is greater than or equal to a preset pulse frequency threshold, and / or the pulse width of the initial laser is less than or equal to a preset pulse width threshold. The die-cutting interface parameters of the battery electrode are determined, and based on the preset laser receiving conditions of the gain device and the die-cutting interface parameters, the grating parameters of each beam-splitting grating used for beam splitting and the lens parameters of each first lens used for reflection are determined; the grating parameters of each beam-splitting grating include at least one of the slit width parameter, slit spacing parameter, slit number parameter, position parameter, and surface tilt angle parameter of the beam-splitting grating, and the lens parameters of each first lens include the position parameter and / or surface tilt angle parameter of the first lens; Based on the grating parameters of all the aforementioned beam-splitting gratings and the lens parameters of all the first lenses, the initial laser is split to obtain the split laser. The laser beam after splitting is amplified by the gain device to obtain the amplified laser beam. The pulse width of the laser after gain is compressed to obtain a compressed laser, and the battery electrode is laser-cut based on the compressed laser. The determination of the die-cutting interface parameters of the battery electrode includes: The material parameters of the battery electrode are determined, and the material property parameters of the battery electrode are determined based on the material parameters; the material property parameters of the battery electrode include the material heat transfer efficiency parameter and / or the material vaporization temperature parameter of the battery electrode. The processing requirements parameters of the battery electrode are determined, and the die-cutting interface parameters of the battery electrode are determined based on the material property parameters and the processing requirements parameters. The processing requirements parameters of the battery electrode include at least one of the shape requirements parameters, wiring requirements parameters, and flatness requirements parameters of the battery electrode. The die-cutting interface parameters of the battery electrode include at least one of the die-cutting depth parameters, die-cutting tilt angle parameters, die-cutting area parameters, die-cutting time parameters, die-cutting temperature parameters, and die-cutting efficiency parameters of the battery electrode.

2. The laser die-cutting method for battery electrodes according to claim 1, characterized in that, The step of performing a gain operation on the split laser beam using the gain device to obtain a gain-enhanced laser beam includes: According to the preset laser modulation parameters, the target field corresponding to the laser modulation parameters is added to the gain medium in the gain device to obtain the added gain medium. Then, through the added gain medium, the population inversion operation is performed on the split laser to obtain the population inverted laser. The laser modulation parameters include laser modulation type parameters and / or laser modulation amplitude parameters. The target field includes at least one of electric field, magnetic field and acoustic field. The population-inverted laser is subjected to photon confinement through the resonant cavity in the gain device to obtain the enhanced laser.

3. The laser die-cutting method for battery electrodes according to claim 2, characterized in that, The split laser includes multiple target lasers, each of which has a corresponding phase parameter and / or frequency parameter. The amplified laser includes all the target lasers after being amplified by the amplification device. The step of performing pulse width compression on the enhanced laser to obtain compressed laser includes: The grating parameters of each target grating and the lens parameters of each second lens in the preset pulse compression device are determined; the grating parameters of each target grating include at least one of the slit width parameter, slit spacing parameter, slit number parameter, position parameter, surface tilt angle parameter and polarity parameter of the target grating; the lens parameters of each second lens include the position parameter and / or surface tilt angle parameter of the second lens. Based on the grating parameters of all the target gratings and the lens parameters of all the second lenses, a pulse width compression operation is performed on all the target lasers after gaining, resulting in all the target lasers after compression, which are used as compressed lasers; the phase parameters of all the target lasers after compression are matched.

4. The laser die-cutting method for battery electrodes according to claim 3, characterized in that, The determination of the grating parameters of each target grating and the lens parameters of each second lens in the preset pulse compression device includes: Based on the pre-determined die-cutting interface parameters of the battery electrode, the peak power requirement parameters corresponding to the laser after gain are determined, and based on the peak power requirement parameters, the pulse compression requirement parameters corresponding to the preset pulse compression device are determined. Based on the pulse compression requirement parameters, the grating parameters of each target grating and the lens parameters of each second lens in the pulse compression device are determined.

5. The laser die-cutting method for battery electrodes according to claim 3 or 4, characterized in that, The target light source was determined in the following way: Determine the type parameters of the preset gain device and the wavelength parameters of multiple light sources to be determined; Based on the type parameters of the gain device and the wavelength parameters of each light source to be determined, the light absorption of the gain device for each light source to be determined is determined; Based on the light absorption of each of the light sources to be determined by the gain device, the light sources to be determined that have a light absorption greater than or equal to a preset light absorption threshold are determined from all the light sources to be determined, and are used as the target light sources for electrode die-cutting.

6. A laser die-cutting device for battery electrodes, characterized in that, The apparatus is used to perform the laser die-cutting method for battery electrodes as described in any one of claims 1-5, and the apparatus comprises: A pump module is used to pump a target light source for electrode die-cutting to obtain an initial laser corresponding to the target light source; the pulse frequency of the initial laser is greater than or equal to a preset pulse frequency threshold, and / or the pulse width of the initial laser is less than or equal to a preset pulse width threshold. The first laser processing module is used to perform a beam splitting operation on the initial laser according to the preset laser receiving conditions of the gain device to obtain a beam splitting laser, and to perform an gain operation on the beam splitting laser through the gain device to obtain a gain-up laser. The second laser processing module is used to perform pulse width compression on the enhanced laser to obtain compressed laser. The die-cutting module is used to perform laser die-cutting operation on the battery electrode based on the compressed laser.

7. A laser die-cutting device for battery electrodes, characterized in that, The device includes: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the laser die-cutting method for battery electrodes as described in any one of claims 1-5.

8. A computer storage medium, characterized in that, The computer storage medium stores computer instructions, which, when invoked, are used to execute the laser die-cutting method for battery electrodes as described in any one of claims 1-5.

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