CN117199480A - Battery monomer processing method - Google Patents
Battery monomer processing method Download PDFInfo
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- CN117199480A CN117199480A CN202310964639.0A CN202310964639A CN117199480A CN 117199480 A CN117199480 A CN 117199480A CN 202310964639 A CN202310964639 A CN 202310964639A CN 117199480 A CN117199480 A CN 117199480A
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Abstract
The invention relates to the technical field of batteries and discloses a battery monomer processing method, which comprises the steps of welding a positive lug and a positive cover plate of a pole core assembly, and welding a negative lug and a negative cover plate of the pole core assembly to obtain a first assembly; coating an insulating film on the first component; filling the first component coated with the insulating film into a containing space formed by covering the first metal shell and the second metal shell to obtain a second component; shaping the second assembly through a shaping die to enable the first metal shell and the second metal shell to be mutually attached, and enabling the positive electrode cover plate and the negative electrode cover plate to be mutually attached to the first metal shell and the second metal shell; sealing and welding the shaped second assembly to seal the accommodating space; and carrying out post-treatment on the sealed second assembly to obtain the battery monomer. The battery monomer processing method provided by the invention has the advantages that the assembly damage is avoided, the assembly difficulty is reduced, the operation flow is simplified, and the processing efficiency is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery monomer processing method.
Background
In the production of batteries, the battery cells are the smallest unit of the battery system, also called the cell. The plurality of battery cells form a module, and the plurality of modules form a battery system. The technological process of the battery cell comprises 3 stages of pole piece preparation, battery cell assembly and formation detection.
In the existing processing technological process of the hard shell battery cell, a series of processes such as welding the shell, the positive and negative lugs with the positive and negative cover plates respectively, welding spot rubberizing, lug folding and cover plate pressing, cap pre-spot welding, positive and negative terminal cap sealing welding and the like are needed to be carried out during the assembly of the battery cell. Wherein the casing is a process of putting the bare cell wrapped by the insulating film into the cavity of the casing from the casing mouth end. The prior art needs to suck the shell opening of the shell when the shell is sleeved, and the bare cell slowly enters the cavity of the shell from the shell opening through multiple pushing operations. The shell mode has a plurality of problems, firstly, the shell burr is required to reach zero tolerance degree, so that the shell manufacturing cost is increased; secondly, the shell opening is easy to damage the bare cell and the processing efficiency is low when the battery is pushed for many times; in addition, the shell opening may be deformed when the shell opening is sucked, so that the welding fit of the shell cover is difficult, and the welding failure rate is increased; finally, the relative position of the bare cell and the cover plate can be determined by the shell mode after the shell is completed, so that an operation space is reserved to execute the actions of the tab folding and the cover plate when the shell cover is welded, and the assembly difficulty and the complexity of an operation flow are increased.
Therefore, there is a need for a battery cell processing method that can simplify the operation flow and improve the processing efficiency.
Disclosure of Invention
Based on the foregoing, it is necessary to provide a battery cell processing method to solve the problems of inconvenient casing, complex operation procedure and low processing efficiency in the battery cell processing process.
The invention provides a battery monomer processing method, which comprises the following steps:
preparing a pole core assembly, a positive pole cover plate, a negative pole cover plate, a first metal shell and a second metal shell, wherein the first end of the pole core assembly is a positive pole lug, and the second end of the pole core assembly is a negative pole lug;
welding the positive electrode lug and the positive electrode cover plate, and welding the negative electrode lug and the negative electrode cover plate to obtain a first component;
coating an insulating film on the first component;
loading the first component coated with the insulating film into a containing space formed by covering the first metal shell and the second metal shell to obtain a second component; the accommodating space is provided with a first opening and a second opening which are oppositely arranged; the positive electrode cover plate is arranged in the first opening, and the negative electrode cover plate is arranged in the second opening;
shaping the second assembly through a shaping die to enable the first metal shell and the second metal shell to be mutually attached, wherein the positive electrode cover plate is mutually attached to the first metal shell and the second metal shell, and the negative electrode cover plate is mutually attached to the first metal shell and the second metal shell;
sealing and welding the shaped second assembly to seal the accommodating space;
and carrying out post-treatment on the second assembly after sealing to obtain the battery monomer.
According to the battery monomer processing method, the first assembly is obtained by welding the lug and the cover plate of the pole core assembly, the first assembly is placed into the cavity of the two parts of metal shells in the open state, and the two parts of metal shells are covered to form the accommodating space so as to obtain the second assembly. On one hand, the invention has no special requirement on the shell opening when manufacturing the metal shell, can manufacture a thinner metal shell on the basis of ensuring the rigidity and the structural strength of the shell, saves manpower and material resources, reduces the manufacturing cost and the manufacturing difficulty of the metal shell, and is beneficial to improving the heat dissipation performance of the battery. On the other hand, the first component is directly put into the two-part metal shell in the open state when the shell is sleeved, and the assembly position of the pole core component and the cover plate can be directly determined, so that the operations of folding the pole lugs and the cover plate are omitted, the assembly difficulty is reduced, and the operation flow is simplified. In addition, unlike the casing with multiple pushing modes, the invention can avoid assembly damage and improve product quality and processing efficiency. Finally, the battery monomer processing method of the invention enables the bonding between the metal shell and the cover plate to be more compact by shaping the second component, and then performs seal welding treatment to seal the accommodating space, thereby ensuring the sealing effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for processing battery cells according to an embodiment of the invention;
FIG. 2 is a schematic diagram illustrating a cover tab welding process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a metal casing cover of a battery cell processing method according to an embodiment of the invention;
FIG. 4 is a schematic diagram illustrating a shaping process of a battery cell according to an embodiment of the invention;
FIG. 5 is a schematic view of a first seal weld of a method of manufacturing a battery cell according to an embodiment of the invention;
fig. 6 is a schematic view of a second seal weld of a method for manufacturing a battery cell according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In a first aspect, as shown in fig. 1, a method for processing a battery cell is provided, including the following steps S10-S70.
S10, preparing a pole core component, a positive electrode cover plate, a negative electrode cover plate, a first metal shell and a second metal shell, wherein the first end of the pole core component is a positive electrode lug, and the second end of the pole core component is a negative electrode lug.
The battery cell comprises a pole core component, electrolyte, two cover plates and two metal shells, wherein the pole core component is a bare cell formed by pole pieces, and the two cover plates and the two metal shells can enclose a containing space for containing the pole core component and the electrolyte. The two cover plates are respectively an anode cover plate and a cathode cover plate, the two metal shells are respectively a first metal shell and a second metal shell with cavities, and the anode lug and the cathode lug are protruding parts at two ends of the pole core assembly. The battery cell realizes charge and discharge through a pole core assembly, the pole core assembly comprises a plurality of layers of positive plates, negative plates and diaphragms, and the positive plates, the diaphragms, the negative plates and the diaphragms … … are manufactured into a battery pole core in sequence from top to bottom. The battery can be divided into a single pole core battery and a multi-pole core battery according to the number of the pole cores of the battery, wherein a pole core assembly of the single pole core battery refers to a single pole core, and a pole core assembly of the multi-pole core battery refers to a combined pole core formed by a plurality of pole cores. The battery has a positive electrode and a negative electrode, and tabs are metal conductors led out from the positive electrode and the negative electrode and serve as contact points for charging and discharging. The first end of the pole core assembly refers to the positive pole, the second end refers to the negative pole, and the first end can be the left end or the right end. For each pole piece, each positive pole piece is reserved with a positive pole piece lug, each negative pole piece is reserved with a negative pole piece lug, the pole core component comprises a plurality of layers of positive pole pieces and negative pole pieces, the plurality of layers of positive pole piece lugs are pre-welded together to form the positive pole lug of the pole core component, and the plurality of layers of negative pole piece lugs are pre-welded together to form the negative pole lug of the pole core component.
And S20, welding the positive electrode lug and the positive electrode cover plate, and welding the negative electrode lug and the negative electrode cover plate to obtain a first component.
The first component is a pole core cover plate component consisting of a pole core component, a positive pole cover plate and a negative pole cover plate. In this embodiment, the connection between the positive electrode tab and the positive electrode cover plate and the connection between the negative electrode tab and the negative electrode cover plate may be realized by welding, and the welding manner may be laser welding or ultrasonic welding. During welding, the positive electrode lug and the positive electrode cover plate can be welded firstly, the negative electrode lug and the negative electrode cover plate can be welded firstly, and the positive electrode lug and the positive electrode cover plate, and the negative electrode lug and the negative electrode cover plate can be welded simultaneously.
S30, coating an insulating film on the first component.
It is understood that the electrode core assembly of the battery cell needs to be coated with an insulating film on the outer side of the electrode core assembly before being mounted in the metal housing, for achieving insulation between the electrode core assembly and the battery housing. The insulating film is a film which is obtained by preforming an insulating material and is matched with the outline of the pole core assembly, and the insulating material of the insulating film can be polypropylene (PP) or polyethylene terephthalate (PET). Meanwhile, as the metal shell has an inner angle during molding, the insulating film is coated on the pole core component, so that mechanical damage caused by extrusion, shaking or friction between the pole core component and the inner angle of the metal shell can be avoided, and the battery performance and safety are protected.
S40, the first assembly coated with the insulating film is placed in a containing space formed by covering the first metal shell and the second metal shell, and a second assembly is obtained; the accommodating space is provided with a first opening and a second opening which are oppositely arranged; the positive electrode cover plate is installed in the first opening, and the negative electrode cover plate is installed in the second opening.
The second component is a pole core cover plate component and a pole core cover plate shell component formed by the first metal shell and the second metal shell. The battery cells may be classified into hard case battery cells and soft case battery cells according to the packaging form. The hard shell battery cell adopts a metal shell as a shell, such as a steel shell or an aluminum shell, and the soft shell battery cell adopts an aluminum plastic film as a shell. The battery cell of the embodiment is a square hard-shell battery cell or a cylindrical hard-shell battery cell, wherein two cover plates and two metal shells can form a cuboid-like or cylinder-like cavity for accommodating the pole core assembly and the electrolyte. In this embodiment, the metal housing is divided into a first metal housing and a second metal housing, where the first metal housing and the second metal housing are both open grooves for forming a specific-shaped accommodating space by covering. When the battery cell is a square hard-shell battery cell, the cross sections of the first metal shell and the second metal shell in the thickness direction are semi-rectangular grooves; when the battery cell is a cylindrical hard-shell battery cell, the cross sections of the first metal shell and the second metal shell in the thickness direction are semicircular grooves.
In this embodiment, the pole core cover plate assembly coated with the insulating film is placed in the first metal shell, and then the second metal shell is covered on the first metal shell, so that the pole core assembly is located in the accommodating space formed by covering the first metal shell and the second metal shell, and the pole core cover plate shell assembly is obtained. In addition, since the positive electrode cover plate and the negative electrode cover plate have been welded on the electrode core assembly, the accommodation space formed by the first metal case and the second metal case has a first opening and a second opening which are oppositely disposed, so that the positive electrode cover plate is installed in the first opening and the negative electrode cover plate is installed in the second opening.
S50, shaping treatment is carried out on the second assembly through a shaping die, so that the first metal shell and the second metal shell are mutually attached, the positive electrode cover plate is mutually attached to the first metal shell and the second metal shell, and the negative electrode cover plate is mutually attached to the first metal shell and the second metal shell.
It will be appreciated that the first and second metal housings include a main cavity, which is an intermediate recess for receiving the pole piece assembly and electrolyte, and a welded skirt surrounding the main cavity, which is an extension surrounding the main cavity. And as welding joint parts between the first metal shell and the second metal shell, between the first metal shell and the positive electrode cover plate and between the first metal shell and the negative electrode cover plate and between the second metal shell and the positive electrode cover plate and between the second metal shell and the negative electrode cover plate, welding skirt edges are further provided with welding skirt edge grooves matched with the positive electrode cover plate and the negative electrode cover plate. The positive electrode cover plate has opposite front and back surfaces in the thickness direction, and the negative electrode cover plate has opposite front and back surfaces in the thickness direction, and the front surface may refer to an upper half part or a lower half part. When the first metal shell and the second metal shell are covered, welding skirt edges of the first metal shell and the second metal shell are mutually covered, and welding skirt edge grooves of the first metal shell and the second metal shell can cover the front face and the back face of the positive electrode cover plate and the negative electrode cover plate. Because there may be a gap or a mismatch in shape, it is necessary to shape the two metal cases of the pole core cover plate case assembly through the shaping mold so that the welded skirts of the first metal case and the second metal case are bonded to each other, the welded skirts of the first metal case and the second metal case are bonded to the front and back surfaces of the positive electrode cover plate, and the welded skirts of the first metal case and the second metal case are bonded to the front and back surfaces of the negative electrode cover plate.
And S60, performing sealing welding on the shaped second assembly so as to seal the accommodating space.
Understandably, the shaped pole piece cover plate housing assembly has a flat surface, and a good sealing effect can be achieved by welding. The sealing welding mode can adopt one of resistance welding, electron beam welding, electromagnetic pulse welding and laser welding. Welding operation is carried out on the welding skirt edge of the shaped pole core cover plate shell assembly, so that a sealed accommodating space is formed by connecting the first metal shell with the second metal shell, the first metal shell with the anode cover plate and the cathode cover plate and the second metal shell with the anode cover plate and the cathode cover plate into a whole through welding seams.
And S70, carrying out post-treatment on the second assembly after sealing to obtain a battery cell.
The post-treatment includes air tightness detection, baking, liquid injection, formation and capacity separation. In this embodiment, the sealed pole core cover plate housing assembly is sequentially subjected to air tightness detection, baking, liquid injection, formation and capacity division to obtain a battery cell.
According to the embodiment, the first assembly is obtained by welding the lug and the cover plate of the pole core assembly, the first assembly is placed into the cavity of the two-part metal shell in the open state, and the two-part metal shell is covered to form the accommodating space so as to obtain the second assembly. On the one hand, the embodiment adopts the metal shell with the open cavity, has no special requirement on the shell opening when manufacturing the metal shell, can manufacture a thinner metal shell on the basis of ensuring the rigidity and the structural strength of the shell, saves manpower and material resources, reduces the manufacturing cost and the manufacturing difficulty of the metal shell, and is beneficial to improving the heat dissipation performance of the battery. On the other hand, in the embodiment, when the casing is in the open state, the first component is directly put into the two-part metal casing, and the assembling position of the pole core component and the cover plate can be directly determined, so that the operations of folding the pole lugs and the cover plate are omitted, the assembling difficulty is reduced, and the operation flow is simplified. In addition, unlike the casing with multiple pushing modes, the invention can avoid assembly damage and improve product quality and processing efficiency. Finally, the battery monomer processing method of the embodiment enables the metal shell and the cover plate to be attached tightly by shaping the second component, and then sealing welding treatment is carried out to seal the accommodating space, so that the sealing effect is ensured. The battery monomer processing method of the embodiment can realize the assembly of a thicker pole core assembly and a thinner metal shell, is favorable for improving the assembly ratio, can also realize the negative pressure sealing of the battery monomer, ensures that pole pieces in the battery monomer are in good contact, and improves the stability of the battery so as to ensure the service life of the battery.
In an embodiment, in step S20, the welding the positive tab and the positive cover plate, and the welding the negative tab and the negative cover plate, includes:
s201, welding the positive electrode lug and an inner leading-out piece of a positive electrode cover plate according to preset welding parameters to form a positive electrode welding seam;
s202, welding the negative electrode lug and the inner leading-out sheet of the negative electrode cover plate according to preset welding parameters to form a negative electrode welding seam;
s203, rubberizing the positive electrode welding seam and the negative electrode welding seam.
The preset welding parameters are control parameters which are preset and used for welding between the positive electrode lug and the positive electrode cover plate and between the negative electrode lug and the negative electrode cover plate, and comprise a welding starting point position parameter, a welding direction parameter and a welding length parameter. The positive electrode cover plate and the negative electrode cover plate are respectively provided with an inner lead-out sheet, and the positive electrode lug and the positive electrode cover plate can be welded together through the inner lead-out sheets, and the negative electrode lug and the negative electrode cover plate can be welded together.
In this embodiment, as shown in fig. 2, the left end of the pole core assembly 100 is a positive pole ear 101, the right end of the pole core assembly 100 is a negative pole ear 102, and the positive pole ear 101 and the inner lead-out piece of the positive pole cover plate 201 are welded according to preset welding parameters to form a positive pole welding seam 203; and welding the negative electrode lug 102 and the inner lead-out sheet of the negative electrode cover plate 202 according to preset welding parameters to form a negative electrode welding seam 204. After the welding is finished, the surfaces of the positive electrode welding line 203 and the negative electrode welding line 204 are subjected to rubberizing treatment, so that burrs on the welding lines can be prevented from splashing or welding slag can be prevented from falling off to damage the electrode core assembly.
According to the embodiment, the inner leading-out sheet of the positive electrode cover plate is connected with the positive electrode lug through the positive electrode welding seam, the inner leading-out sheet of the negative electrode cover plate is connected with the negative electrode lug through the negative electrode welding seam, so that the welding position can be accurately positioned, and the welding precision is ensured. In addition, the positive electrode welding seam and the negative electrode welding seam are subjected to rubberizing treatment, so that damage to the pole core assembly can be effectively avoided.
In one embodiment, in step S40, the loading the first component coated with the insulating film into the accommodating space formed by covering the first metal casing and the second metal casing includes:
s401, after the first metal shell is covered on the front surface of the first assembly, the first assembly covered with the first metal shell is turned over, and the second metal shell is covered on the back surface of the first assembly, so that the first metal shell and the second metal shell are covered to form the accommodating space.
The first component is a pole core cover plate component consisting of a pole core component, a positive pole cover plate and a negative pole cover plate, wherein the pole core component is provided with a front surface and a back surface which are opposite in the thickness direction, and the front surface of the pole core component can refer to an upper half part or a lower half part. In this embodiment, as shown in fig. 3, the left end of the electrode core assembly is connected to the negative electrode cover plate 202, the right end of the electrode core assembly is connected to the positive electrode cover plate 201, and the surface of the electrode core assembly is covered with the insulating film 300. Designating the upper half of the pole core assembly as the front face, the lower half of the pole core assembly as the back face, covering the first metal housing 401 when the front face of the pole core assembly with the insulating film 300 wrapped on the surface faces upward, then turning over the pole core assembly with the insulating film 300 wrapped on the surface and the first metal housing 401, and covering the second metal housing 402 when the back face of the pole core assembly with the insulating film 300 wrapped on the surface faces upward. After the first metal casing 401 and the second metal casing 402 are covered, a receiving space for receiving the electrode core assembly, the positive electrode cover plate 201 and the negative electrode cover plate 202, the surfaces of which are wrapped with the insulating film 300, is formed.
According to the embodiment, the pole core cover plate assembly is placed into the two-part metal shell in the open state, the two-part metal shell is covered to form the accommodating space to obtain the pole core cover plate shell assembly, the casing is not required to be pushed for many times, damage is avoided, the operation flow is simplified, and the processing efficiency is improved.
In one embodiment, in step S50, the shaping the second component by using a shaping mold includes:
s501, loading the second component into the shaping mold;
s502, carrying out press fit shaping on the first metal shell and the second metal shell through the shaping die, so that the welding skirt edge of the first metal shell and the welding skirt edge of the second metal shell, the positive electrode cover plate and the edge shell of the first opening and the negative electrode cover plate and the edge shell of the second opening are mutually attached.
The second component is a pole core cover plate component and a pole core cover plate shell component formed by the first metal shell and the second metal shell. The shaping mould is a hollow mould which is prefabricated according to standard size and is matched with the outline of the pole core cover plate shell assembly, and the shaping mould comprises two openable and closable parts and is used for loading the pole core cover plate shell assembly which needs shaping. In this embodiment, as shown in fig. 4, the pole core cover plate housing assembly is loaded into the shaping mold 500 for press-fit shaping, and the shaped pole core cover plate housing assembly is obtained by attaching proper matching between the positive pole cover plate 201 and the edge housing of the first opening formed by the welding skirt groove of the first metal housing 401 and the welding skirt groove of the second metal housing 402, between the negative pole cover plate and the edge housing of the second opening formed by the welding skirt groove of the first metal housing 401 and the welding skirt groove of the second metal housing 402, and between the welding skirt grooves of the first metal housing 401 and the second metal housing 402.
According to the embodiment, the pole core cover plate shell assembly is pressed and shaped through the standard shaping die, so that gaps between the two metal shells and the two cover plates are reduced, and the adaptation degree between the metal shells and the cover plates is ensured.
In an embodiment, in step S60, the sealing welding is performed on the shaped second component to seal the accommodating space, and the method further includes:
s601, performing seal welding on the front surface of the second assembly according to a first preset seal welding parameter to form a first seal welding seam surrounding the accommodating space so as to seal assembly gaps among a welding skirt of the first metal shell, a welding skirt of the second metal shell, the front surface of the positive electrode cover plate, the first metal shell corresponding to the first opening, and the front surface of the negative electrode cover plate, and the first metal shell corresponding to the second opening;
s602, performing seal welding on the back surface of the pole core cover plate shell assembly according to a second preset seal welding parameter, and forming a second seal welding seam at a position corresponding to the positive pole cover plate and the negative pole cover plate so as to seal assembly gaps between the back surface of the positive pole cover plate and the second metal shell corresponding to the first opening and between the back surface of the negative pole cover plate and the second metal shell corresponding to the second opening.
The first preset sealing parameters are understandably preset control parameters for circumferential welding on the front side of the pole core cover plate housing assembly. The second preset seal welding parameters are preset control parameters for welding on the reverse side of the pole core cover plate shell assembly. The second component is a pole core cover plate component, a first metal shell and a pole core cover plate shell component formed by the second metal shell, the pole core cover plate component is provided with a front surface and a back surface which are opposite in the thickness direction, and the front surface of the pole core cover plate component can refer to an upper half part or a lower half part. The outermost layer of the pole core cover plate shell assembly is an outer surface formed by encircling the first metal shell, the second metal shell, the positive electrode cover plate and the negative electrode cover plate, and the front surface and the back surface of the pole core cover plate shell assembly refer to one of the outer surface of the first metal shell and the outer surface of the second metal shell. When the outer surface of the first metal shell is the front surface of the pole core cover plate shell assembly, the outer surface of the second metal shell is the back surface of the pole core cover plate shell assembly; when the outer surface of the second metal shell is the front surface of the pole core cover plate shell assembly, the outer surface of the first metal shell is the back surface of the pole core cover plate shell assembly.
In this embodiment, as shown in fig. 5 and 6, the front surface of the pole core cover plate housing assembly is the outer surface of the first metal housing 401, and the back surface of the pole core cover plate housing assembly is the outer surface of the second metal housing 402. And performing primary seal welding on the outer surface of the welding skirt of the first metal shell 401 according to a first preset seal welding parameter to form a first seal welding seam 601 surrounding the accommodating space, so that assembly gaps between the welding skirt of the first metal shell 401 and the welding skirt of the second metal shell 402, between the welding skirt groove of the first metal shell 401 and the positive electrode cover plate 201 and between the welding skirt groove of the first metal shell 401 and the negative electrode cover plate 202 are attached, and connection sealing is realized through the first seal welding seam 601. At this time, the welded skirt of the second metal case 402 on the opposite side of the terminal cover case assembly is already connected to the welded skirt of the first metal case 401, but the welded skirt groove of the second metal case 402 is not connected to the positive electrode cover 201 and the negative electrode cover 202. And performing secondary seal welding on the outer surface of the welding skirt of the second metal shell 402 according to a second preset seal welding parameter, and forming a second seal welding seam 602 at a position corresponding to the positive electrode cover plate 201 and the negative electrode cover plate 202, so that the assembly gaps between the welding skirt groove of the second metal shell 402 and the positive electrode cover plate 201 and between the welding skirt groove of the second metal shell 402 and the negative electrode cover plate 202 are attached, and connection sealing is realized through the second seal welding seam 602.
The first sealing welding seams 601 are four welding seams which encircle the accommodating space and are connected end to end, wherein the upper and lower two first sealing welding seams 601 are used for realizing connection between the welding skirt of the first metal shell 401 and the welding skirt of the second metal shell 402, the left first sealing welding seam 601 is used for realizing connection between the welding skirt groove of the first metal shell 401 and the positive electrode cover plate 201, and the right first sealing welding seam 601 is used for realizing connection between the welding skirt groove of the first metal shell 401 and the negative electrode cover plate 202. The second seal welds 602 are two sets of "two-to-one" welds distributed along the weld skirt groove of the second metal shell 402, with the two transverse welds in each set being parallel to each other and perpendicular to the vertical welds. The vertical welding seams in the group of second sealing welding seams 602 located at the left side are distributed along the length direction of the positive electrode cover plate and used for realizing connection between the welding skirt groove of the second metal shell 402 and the positive electrode cover plate 201, and the horizontal welding seams are distributed along the width direction of the positive electrode cover plate and used for enhancing connection between the welding skirt groove of the second metal shell 402 and the positive electrode cover plate 201. The vertical welds in the set of second seal welds 602 on the right side are distributed along the length direction of the anode cover plate for achieving connection between the welded skirt groove of the second metal shell 402 and the anode cover plate 202, and the horizontal welds are distributed along the width direction of the anode cover plate for enhancing connection between the welded skirt groove of the second metal shell 402 and the anode cover plate 202.
In the embodiment, the front surface of the pole core cover plate shell assembly is subjected to primary sealing welding, the back surface of the pole core cover plate shell assembly is subjected to secondary sealing welding, and a sealed accommodating space is formed among the first metal shell, the second metal shell, the positive electrode cover plate and the negative electrode cover plate through the complementary action of the secondary sealing welding, so that the sealing effect is ensured, and meanwhile, the welding processing efficiency is improved.
In one embodiment, in step S10, the preparing a pole core assembly includes:
s101, preparing electrode materials on a pole core preparation line to obtain a positive pole piece and a negative pole piece;
s102, assembling the multi-layer positive plate, the multi-layer negative plate and the diaphragm according to a preset assembly mode to obtain a pole core assembly; the positive lug of the pole core component is formed by pre-welding the lugs of the positive pole pieces in multiple layers, and the negative lug of the pole core component is formed by pre-welding the lugs of the negative pole pieces in multiple layers.
The electrode material comprises a positive electrode material and a negative electrode material, and the positive electrode plate and the negative electrode plate are obtained by mixing, coating, baking, rolling and other procedures on a pole core preparation line. The preset assembly mode is a preset process for assembling the positive plate, the negative plate and the diaphragm, and can be a winding mode or a lamination mode. Each positive plate is reserved with a positive plate lug, each negative plate is reserved with a negative plate lug, the pole core assembly comprises a plurality of layers of positive plates and negative plates, the plurality of layers of positive plates and lugs are welded together to form the positive lug of the pole core assembly, and the plurality of layers of negative plates and lugs are welded together to form the negative lug of the pole core assembly. When the uneven areas exist on the surfaces of the positive electrode lug and the negative electrode lug formed by pre-welding, the positive electrode lug and the negative electrode lug need to be subjected to leveling treatment. In addition, when the reserved parts of the lugs of the positive plate and the negative plate are too many, the positive lug and the negative lug formed by pre-welding are required to be cut, the redundant reserved parts of the lugs are removed, and the proper operation space is ensured when the welding operation is carried out on the positive lug and the negative lug subsequently.
In the embodiment, the multi-layer pole piece is assembled to obtain the pole core assembly, and the positive pole lug and the negative pole lug are formed through pre-welding, so that the subsequent welding operation of the pole lug is facilitated.
In one embodiment, the preset assembly mode comprises winding assembly and lamination assembly; in step S102, namely, assembling the multi-layer positive plate, the multi-layer negative plate and the separator according to a preset assembly mode to obtain a pole core assembly, including:
s1021, when the preset assembly mode is winding assembly, winding and cold-pressing the multi-layer positive plate, the multi-layer negative plate and the diaphragms to obtain a winding electrode core assembly;
and S1022, when the preset assembly mode is lamination assembly, lamination and hot-pressing treatment are carried out on the multi-layer positive plate, the multi-layer negative plate and the diaphragm, so as to obtain the lamination pole core assembly.
Understandably, the process of assembling the positive and negative electrode sheets with the separator to form the electrode core assembly includes a winding process and a lamination process. The winding is a production process for winding the positive plate, the negative plate and the diaphragm with matched sizes after slitting into a pole core, and the lamination is a production process for alternately stacking the positive plate, the diaphragm and the negative plate together to form the pole core. For the hard-shell battery, a cylindrical hard-shell battery and a square hard-shell battery are classified according to the shape, wherein the square hard-shell battery can adopt a lamination process or a winding process, and the cylindrical battery can only adopt the winding process. The pole pieces assembled together are compacted, so that the positive and negative pole materials on the pole pieces can be uniformly distributed, the pole pieces are attached together, and the compacting method comprises cold pressing and hot pressing. When the multi-layer positive plate, the multi-layer negative plate and the multi-layer separator are assembled by winding, cold pressing treatment is selected to obtain a winding pole core assembly; when the multi-layer positive plate, the multi-layer negative plate and the diaphragm are assembled by adopting lamination, hot pressing treatment is selected, and the laminated pole core assembly is obtained.
According to the embodiment, different compaction methods are adopted for different pole piece assembly modes, so that the pole pieces in the pole core assembly are more tightly attached, and the assembly among the pole core assembly, the metal shell and the cover plate is facilitated.
In an embodiment, in step S10, the preparing the first metal shell and the second metal shell includes:
s103, stamping the metal sheet according to preset stamping parameters to obtain the first metal shell with the first cavity and the second metal shell with the second cavity matched with the first cavity; when the first metal shell and the second metal shell are covered, the first cavity and the second cavity are communicated and enclose the accommodating space.
It is understood that the metal shell is formed by stamping a metal sheet, and the preset stamping parameters are preset operating parameters of stamping the metal sheet, including stamping depth, stamping angle, and the like. The first metal shell and the second metal shell comprise a main cavity body and a welding skirt edge surrounding the main cavity body, the main cavity body is an intermediate groove for accommodating the pole core assembly and electrolyte, the welding skirt edge is an extension part surrounding the main cavity body, and the welding skirt edge further comprises a welding skirt edge groove matched with the positive electrode cover plate and the negative electrode cover plate.
In the embodiment, the pole core assembly, the positive electrode cover plate and the negative electrode cover plate are provided with opposite front surfaces and opposite back surfaces in the thickness direction, and the metal plate is stamped according to preset stamping parameters, so that a cavity groove for accommodating the front surfaces of the pole core assembly and a welding skirt groove for accommodating the front surfaces of the positive electrode cover plate and the negative electrode cover plate are formed by the metal plate, and a first metal shell is obtained; stamping the metal plate according to preset stamping parameters, so that the metal plate forms a cavity groove for accommodating the back surface of the pole core assembly and a welding skirt groove for accommodating the back surfaces of the positive electrode cover plate and the negative electrode cover plate, and a second metal shell is obtained.
The embodiment has no special requirement on the shell opening of the metal shell, and the manufacturing cost and the manufacturing difficulty of the metal shell are reduced by one-step forming of stamping the metal plate; meanwhile, the assembling position of the pole core assembly and the cover plate can be directly determined through the grooves of the metal shell, and the assembling difficulty is reduced.
In an embodiment, in step S70, the post-processing the sealed second assembly to obtain a battery cell includes:
and S701, sequentially performing air tightness detection, baking, liquid injection, formation and capacity division on the second assembly after sealing to obtain a battery monomer.
Understandably, weld tightness detection needs to be performed on the accommodating space before electrolyte is injected into the accommodating space, so that leakage of the electrolyte due to loose sealing is avoided. After the air tightness detection is passed, the pole core cover plate shell assembly is required to be baked, so that the accommodating space is in a dry state, and the influence of moisture on the electrolyte is avoided. The electrolyte is an important component of the battery, is considered as blood of the battery cell, and the process of injecting the electrolyte into the accommodating space through the reserved injection hole is called injection. The formation treatment is to test the pole core cover plate shell assembly after the first liquid injection through formation reaction equipment, so that the electrolyte infiltrates into the pole piece and participates in chemical reaction, and the conversion of chemical energy and electric energy is realized.
The embodiment ensures the stability of the battery cell through a series of detection and operation of the pole core cover plate shell assembly.
In one embodiment, the positive electrode cover plate or the negative electrode cover plate is provided with a liquid injection hole; in step S701, the injecting the sealed second assembly includes:
s7011, injecting electrolyte into the accommodating space of the baked second assembly through the liquid injection hole, and performing temporary sealing treatment on the liquid injection hole;
the forming of the sealed second component includes:
s7012, performing a permanent sealing process on the liquid injection hole after performing a chemical process on the second component after the temporary sealing process.
The injection is divided into a primary injection and a secondary injection, wherein the primary injection is the primary injection, and the secondary injection is the process of supplementing the electrolyte after formation. The liquid injection hole can be arranged on the positive electrode cover plate and the negative electrode cover plate, and is used for enabling electrolyte to enter the accommodating space of the electrode core cover plate shell assembly. After one-time liquid injection, the liquid injection hole is subjected to temporary sealing treatment, and the temporary sealing treatment can be used for blocking the liquid injection hole by adopting a rubber nail. After formation detection, if secondary liquid injection is not needed, the liquid injection hole is directly subjected to permanent sealing treatment; if the secondary liquid injection is needed, the liquid injection hole is subjected to permanent sealing treatment after the secondary liquid injection, and the permanent sealing treatment can be sealed by adopting a welded metal sheet.
In the embodiment, temporary sealing treatment is adopted for the liquid injection hole after one-time liquid injection, so that electrolyte is prevented from leaking, meanwhile, the electrolyte is convenient to add, permanent sealing treatment is adopted for the liquid injection hole after formation detection, the electrolyte is prevented from leaking, and the stability of the battery is ensured.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. A method of processing a battery cell, comprising:
preparing a pole core assembly, a positive pole cover plate, a negative pole cover plate, a first metal shell and a second metal shell, wherein the first end of the pole core assembly is a positive pole lug, and the second end of the pole core assembly is a negative pole lug;
welding the positive electrode lug and the positive electrode cover plate, and welding the negative electrode lug and the negative electrode cover plate to obtain a first component;
coating an insulating film on the first component;
loading the first component coated with the insulating film into a containing space formed by covering the first metal shell and the second metal shell to obtain a second component; the accommodating space is provided with a first opening and a second opening which are oppositely arranged; the positive electrode cover plate is arranged in the first opening, and the negative electrode cover plate is arranged in the second opening;
shaping the second assembly through a shaping die to enable the first metal shell and the second metal shell to be mutually attached, wherein the positive electrode cover plate is mutually attached to the first metal shell and the second metal shell, and the negative electrode cover plate is mutually attached to the first metal shell and the second metal shell;
sealing and welding the shaped second assembly to seal the accommodating space;
and carrying out post-treatment on the second assembly after sealing to obtain the battery monomer.
2. The method of processing a battery cell of claim 1, wherein the welding the positive tab and the positive cap plate and the welding the negative tab and the negative cap plate comprises:
welding the positive electrode lug and the inner leading-out piece of the positive electrode cover plate according to preset welding parameters to form a positive electrode welding seam;
welding the negative electrode lug and the inner leading-out sheet of the negative electrode cover plate according to preset welding parameters to form a negative electrode welding seam;
and carrying out rubberizing treatment on the anode welding seam and the cathode welding seam.
3. The battery cell processing method according to claim 1, wherein the loading of the first member covered with the insulating film into a receiving space formed by the covering of the first metal case and the second metal case comprises:
after the first metal shell is covered on the front surface of the first component, the first component covered with the first metal shell is turned over, and the second metal shell is covered on the back surface of the first component, so that the first metal shell and the second metal shell are covered to form the accommodating space.
4. The battery cell processing method according to claim 1, wherein the shaping of the second component by the shaping die includes:
loading the second component into the shaping mold;
and the shaping die is used for carrying out press fit shaping on the first metal shell and the second metal shell, so that the welding skirt edge of the first metal shell and the welding skirt edge of the second metal shell, the positive electrode cover plate and the edge shell of the first opening and the negative electrode cover plate and the edge shell of the second opening are mutually attached.
5. The method of claim 1, wherein said sealing the shaped second assembly to seal the receiving space comprises:
sealing and welding the front surface of the second assembly according to a first preset sealing and welding parameter to form a first sealing and welding seam surrounding the accommodating space so as to seal assembly gaps among the welding skirt edge of the first metal shell, the welding skirt edge of the second metal shell, the front surface of the positive electrode cover plate, the first metal shell corresponding to the first opening, the front surface of the negative electrode cover plate and the first metal shell corresponding to the second opening;
and performing seal welding on the back surface of the pole core cover plate shell assembly according to a second preset seal welding parameter, and forming a second seal welding seam at the position corresponding to the positive pole cover plate and the negative pole cover plate so as to seal assembly gaps between the back surface of the positive pole cover plate and the second metal shell corresponding to the first opening and between the back surface of the negative pole cover plate and the second metal shell corresponding to the second opening.
6. The method of claim 1, wherein preparing the electrode core assembly comprises:
preparing electrode materials on a pole core preparation line to obtain a positive pole piece and a negative pole piece;
assembling the multi-layer positive plate, the multi-layer negative plate and the diaphragms according to a preset assembly mode to obtain a pole core assembly; the positive lug of the pole core component is formed by pre-welding the lugs of the positive pole pieces in multiple layers, and the negative lug of the pole core component is formed by pre-welding the lugs of the negative pole pieces in multiple layers.
7. The battery cell processing method of claim 6, wherein the pre-set assembly mode comprises winding assembly and lamination assembly;
the multi-layer positive plate, the multi-layer negative plate and the diaphragm are assembled according to a preset assembly mode to obtain a pole core assembly, and the pole core assembly comprises:
when the preset assembly mode is winding assembly, winding and cold pressing are carried out on the multi-layer positive plate, the multi-layer negative plate and the multi-layer diaphragm to obtain a winding pole core assembly;
and when the preset assembly mode is lamination assembly, lamination and hot pressing treatment are carried out on the multi-layer positive plate, the multi-layer negative plate and the diaphragm to obtain a lamination pole core assembly.
8. The method of claim 1, wherein preparing the first metal case and the second metal case comprises:
stamping a metal plate according to preset stamping parameters to obtain the first metal shell with a first cavity and the second metal shell with a second cavity matched with the first cavity; when the first metal shell and the second metal shell are covered, the first cavity and the second cavity are communicated and enclose the accommodating space.
9. The method for processing a battery cell according to claim 1, wherein the post-processing the sealed second assembly to obtain the battery cell comprises:
and sequentially performing air tightness detection, baking, liquid injection, formation and capacity division on the sealed second assembly to obtain a battery monomer.
10. The battery cell processing method according to claim 9, wherein a liquid injection hole is provided in the positive electrode cover plate or the negative electrode cover plate;
the injecting the liquid into the second assembly after sealing comprises the following steps:
injecting electrolyte into the accommodating space of the baked second assembly through the liquid injection hole, and performing temporary sealing treatment on the liquid injection hole;
the forming of the sealed second component includes:
and after performing formation treatment on the second assembly subjected to the temporary sealing treatment, performing permanent sealing treatment on the liquid injection hole.
Priority Applications (1)
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|---|---|---|---|
| CN202310964639.0A CN117199480A (en) | 2023-08-01 | 2023-08-01 | Battery monomer processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310964639.0A CN117199480A (en) | 2023-08-01 | 2023-08-01 | Battery monomer processing method |
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| CN117199480A true CN117199480A (en) | 2023-12-08 |
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| CN202310964639.0A Pending CN117199480A (en) | 2023-08-01 | 2023-08-01 | Battery monomer processing method |
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