Press-fit correction device and battery manufacturing apparatus

Abstract

A press-fit correction device and a battery manufacturing apparatus. The press-fit correction device is used for correcting a casing (11) when an end cover (12) of a battery cell (100) is pressed into the casing (11). The casing (11) comprises two first side walls (111) arranged opposite each other in a first direction (X) and two second side walls (112) arranged opposite each other in a second direction (Y), with the second direction (Y) being perpendicular to the first direction (X), and the area of each first side wall (111) being greater than the area of each second side wall (112). The press-fit correction device (200) comprises two correction modules (21) and a driving mechanism (22), wherein the two correction modules (21) are arranged opposite each other in the first direction (X), and the two correction modules (21) are configured to act on the two first side walls (111); and the driving mechanism (22) is used for driving the two correction modules (21) to move close to or away from each other in the first direction (X), such that each correction module (21) corrects the corresponding first side wall (111), thereby improving the yield of press-fit products.

Description

Press-fit correction device and battery manufacturing equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application CN202322005418.9, filed on July 28, 2023, entitled “Press-fit correction device and battery manufacturing equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of battery manufacturing, and in particular to a press-fit correction device and battery manufacturing equipment. Background Art

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

[0005] During the battery manufacturing process, the battery yield rate is an issue that cannot be ignored. Therefore, how to improve the battery yield rate is a technical problem that needs to be solved urgently in battery technology.

[0006] Summary of the Invention

[0007] The present application provides a press-fit correction device and battery manufacturing equipment, which can improve the product yield.

[0008] This application is achieved through the following technical solutions:

[0009] In a first aspect, embodiments of the present application provide a press-fit correction device for correcting a battery cell housing when the end cap is pressed into the housing. The housing includes two first side walls arranged opposite each other along a first direction and two second side walls arranged opposite each other along a second direction, the second direction being perpendicular to the first direction, and the area of ​​the first side walls being greater than the area of ​​the second side walls. The press-fit correction device includes two correction modules and a drive mechanism, the two correction modules being arranged opposite each other along the first direction, the two correction modules being configured to act on the two first side walls; the drive mechanism being configured to drive the two correction modules toward or away from each other along the first direction, so that each correction module corrects the corresponding first side wall.

[0010] According to the press-fit correction device of the embodiment of the present application, two correction modules are applied to the two first side walls of the shell with a larger area, so that the first side walls are corrected when the end cover is pressed into the shell, and the first side walls are constrained to deform in a direction away from the interior of the shell, so that the shell and the end cover are reliably connected, thereby improving the yield rate of the press-fitted products.

[0011] According to some embodiments of the present application, each correction module includes a base and a correction block disposed on the base. Along the first direction, the correction block protrudes from the base, and the correction block is used to contact the first side wall.

[0012] In the above scheme, the base is used to provide a positioning basis for the correction block. The correction block protrudes from the base and may not contact the shell. The correction block may be arranged near the opening of the shell to reduce the interference between the base and other components, making it easier for the end cover to be pressed into the shell.

[0013] According to some embodiments of the present application, along the first direction, the orthographic projection of the correction block on the first side wall covers the first side wall in the second direction.

[0014] In the above solution, the correction block has a larger size in the second direction and can cover the first side wall in the second direction, so as to have a better restraining effect on the first side wall in the second direction.

[0015] According to some embodiments of the present application, the correction block is in the shape of a cuboid, and the length direction of the correction block is parallel to the second direction.

[0016] In the above scheme, the correction block is a rectangular parallelepiped, and the length direction of the correction block is parallel to the second direction. On the one hand, it enables the correction block to have a larger contact area with the first side wall, so that the correction block has a better restraining effect on the first side wall. On the other hand, it is easy to process and manufacture.

[0017] According to some embodiments of the present application, the calibration block is detachably connected to the base.

[0018] In the above solution, the calibration block is detachably connected to the base to facilitate replacement or adaptation to battery cells of different specifications.

[0019] According to some embodiments of the present application, there are multiple correction blocks, and the multiple correction blocks are arranged at intervals along the second direction.

[0020] In the above solution, the plurality of correction blocks are spaced apart along the second direction, so that the correction module has a plurality of contact positions with the first side wall in the second direction, thereby having a better restraining effect on the first side wall.

[0021] According to some embodiments of the present application, the base includes a plurality of protrusions, and each correction block is disposed on one protrusion.

[0022] In the above solution, the base includes a plurality of protrusions, each of which corresponds to a correction block, so as to facilitate the installation and positioning of the plurality of correction blocks and reduce the weight of the base.

[0023] According to some embodiments of the present application, each correction block is detachably connected to the corresponding protrusion.

[0024] In the above solution, each correction block is detachably connected to the corresponding protrusion to facilitate replacement of the correction block.

[0025] According to some embodiments of the present application, the multiple correction blocks include two end correction blocks and at least one middle correction block, the two end correction blocks are respectively arranged at the two ends of the base along the second direction, and along the second direction, at least one middle correction block is located between the two end correction blocks.

[0026] In the above solution, the two end correction blocks and the at least one middle correction block can respectively correspond to the end and the middle of the first side wall in the second direction, so as to have a better restraining effect on different parts of the first side wall.

[0027] According to some embodiments of the present application, along the first direction, projections of multiple correction blocks of two correction modules overlap with each other.

[0028] In the above solution, when viewed along the first direction, the multiple correction blocks of the two correction modules overlap with each other, which facilitates processing and manufacturing, and the forces acting on the housing from the two correction modules are balanced.

[0029] According to some embodiments of the present application, the base is made of metal; and / or the correction block is made of polyoxymethylene.

[0030] In the above solution, the base is made of metal, which has high strength; the correction block is made of polyformaldehyde, which has the characteristics of high hardness, high toughness, and smooth surface, reducing damage to the shell.

[0031] In a second aspect, an embodiment of the present application further provides a battery manufacturing device, which includes a press-fit correction device as provided in any of the above embodiments.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0034] FIG1 is an exploded view of a battery cell provided in some embodiments of the present application;

[0035] FIG2 is a schematic structural diagram of a press-fit correction device provided in some embodiments of the present application;

[0036] FIG3 is a schematic structural diagram of a press-fit correction device provided in other embodiments of the present application;

[0037] FIG4 is a perspective view of a partial structure of a press-fit correction device provided in some embodiments of the present application;

[0038] FIG5 is a schematic diagram of the coordination between the correction module and the housing provided in some embodiments of the present application;

[0039] FIG6 is a schematic diagram of the coordination between the correction module and the housing provided in other embodiments of the present application.

[0040] In the drawings, the drawings are not drawn to scale.

[0041] Marking instructions: 100-battery cell; 11-shell; 111-first side wall; 112-second side wall; 12-end cover; 13-electrode assembly; 14-electrode terminal; 200-press-fit correction device; 21-correction module; 211-base; 2111-protrusion; 212-correction block; 2121-end correction block; 2122-middle correction block; 22-driving mechanism; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0044] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0046] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0047] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0049] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0050] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0051] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0052] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0053] The battery cells may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0054] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0055] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0056] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0057] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0058] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0059] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0060] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0061] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0062] As an example, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0063] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0064] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0065] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0066] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0067] In some embodiments, the electrode assembly is a laminate structure.

[0068] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0069] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0070] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal may be provided on an end cap or on the housing.

[0071] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0072] The development of battery technology must take into account multiple design factors at the same time, such as performance parameters such as energy density, discharge capacity, charge and discharge rate, and also the battery yield.

[0073] During the manufacturing process of the battery, after the electrode assembly is placed in the shell, the end cover closes the opening of the shell. During the assembly process of the end cover and the shell, the end cover is pressed into the opening of the shell. The shell includes a bottom wall and a side wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall, and the other end of the side wall forms an opening. Taking the square shell battery cell as an example, the shell includes two first side walls arranged opposite to each other along a first direction and two second side walls arranged opposite to each other along a second direction, and the area of ​​the first side wall is larger than the area of ​​the second side wall. Since the first side wall has a larger area and a larger size in the second direction, when the end cover is pressed into the shell, the first side wall is easily deformed under the extrusion force of the end cover. For example, the first side wall is easy to bulge toward the outside of the shell, causing the connection between the end cover and the shell to fail, resulting in a low yield rate of the product.

[0074] In view of this, in order to solve the problem that the end cover is pressed into the shell, causing the shell to deform, and thus affecting the yield rate of the product, an embodiment of the present application provides a technical solution. The press-fit correction device includes two correction modules and a driving mechanism. The driving mechanism is used to drive the two correction modules to move closer to or away from each other along a first direction. The correction module is used to act on the first side wall to constrain the side wall of the shell with a larger area when the end cover is pressed into the shell, thereby reducing the risk of deformation of the shell and improving the yield rate of the press-fitted product.

[0075] The above-mentioned press-fit correction device is used to correct the first side wall of the shell with a larger area through two correction modules. When the end cover is pressed into the shell, the correction module acts on the first side wall. The correction module can constrain the first side wall to constrain the first side wall from deforming toward the outside of the shell, thereby reducing the probability of deformation of the first side wall, so that the product after the end cover and the shell are assembled has a higher yield rate.

[0076] Please refer to Figure 1, which is an exploded view of a battery cell provided in some embodiments of the present application. As shown in Figure 1, battery cell 100 includes a housing 11, an end cap 12, an electrode assembly 13, and other functional components. Housing 11 has an opening, and end cap 12 closes the opening, isolating the internal environment of battery cell 100 from the external environment.

[0077] The housing 11 is a component used to cooperate with the end cap 12 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 13, electrolyte, and other components. The housing 11 and the end cap 12 can be independent components. The housing 11 can be of various shapes and sizes. Specifically, the shape of the housing 11 can be determined according to the specific shape and size of the electrode assembly 13. The housing 11 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0078] The end cap 12 refers to a component that covers the opening of the shell 11 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 12 can be adapted to the shape of the shell 11 to match the shell 11. Optionally, the end cap 12 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 12 is not easily deformed when squeezed or collided, so that the battery cell 100 can have higher structural strength and improved reliability. Functional components such as electrode terminals 14 can be provided on the end cap 12. The electrode terminal 14 can be used to electrically connect to the electrode assembly 13 for outputting or inputting electrical energy from the battery cell 100. The material of the end cap 12 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 12. The insulating structure can be used to isolate the electrical connection components in the shell 11 from the end cap 12 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0079] The electrode assembly 13 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 13 may be contained in the housing 11. The electrode assembly 13 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The separator is used to separate the positive and negative electrode sheets to avoid internal short circuits between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 13, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals 14 to form a current loop.

[0080] Please refer to Figures 2 to 6. Figure 2 is a schematic structural diagram of a press-fit correction device provided in some embodiments of the present application. Figure 3 is a schematic structural diagram of a press-fit correction device provided in other embodiments of the present application. Figure 4 is a stereoscopic diagram of a partial structure of a press-fit correction device provided in some embodiments of the present application. Figure 5 is a schematic diagram of the coordination of a correction module and a shell provided in some embodiments of the present application. Figure 6 is a schematic diagram of the coordination of a correction module and a shell provided in other embodiments of the present application. According to some embodiments of the present application, an embodiment of the present application provides a press-fit correction device 200 for calibrating the shell 11 when the end cap 12 of the battery cell 100 is pressed into the shell 11. The shell 11 includes two first side walls 111 arranged opposite to each other along a first direction X and two second side walls 112 arranged opposite to each other along a second direction Y. The second direction Y is perpendicular to the first direction X. The area of ​​the first side wall 111 is larger than the area of ​​the second side wall 112. The press-fitting correction device 200 includes two correction modules 21 and a driving mechanism 22. The two correction modules 21 are arranged opposite to each other along the first direction X. The two correction modules 21 are used to act on the two first side walls 111; the driving mechanism 22 is used to drive the two correction modules 21 to move closer to or away from each other along the first direction X, so that each correction module 21 corrects the corresponding first side wall 111.

[0081] In the figure, the direction indicated by the letter X is the first direction, the direction indicated by the letter Y is the second direction Y, and the direction indicated by the letter Z is the third direction. The third direction Z may be the direction in which the end cap 12 is pressed into the housing 11. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first direction X may be the length direction of the battery cell 100, the second direction Y may be the thickness direction of the battery cell 100, and the third direction Z may be the height direction of the battery cell 100.

[0082] The dimension of the first side wall 111 in the Z direction is the same as the dimension of the second side wall 112 in the third direction Z. The dimension of the first side wall 111 in the second direction Y may be greater than the dimension of the second side wall 112 in the first direction X. When the end cap 12 is pressed into the opening of the housing 11, the first side wall 111 is easily deformed in the second direction Y under the action of the end cap 12. The correction module 21 acts on the first side wall 111, constraining it and reducing the probability of deformation of the first side wall 111.

[0083] The two correction modules 21 are disposed opposite to each other along the first direction X, and a clamping space is formed between the two correction modules 21 . The housing 11 can be accommodated in the clamping space.

[0084] The drive mechanism 22 is a mechanism that drives the two calibration modules 21 toward or away from each other. The drive mechanism 22 can be a linear drive mechanism, such as a pneumatic cylinder, an oil cylinder, or an electric push rod. Alternatively, the drive mechanism 22 can include a motor and a transmission assembly, with the motor driving the transmission assembly to move the two calibration modules 21 toward or away from each other.

[0085] In some embodiments, the number of driving mechanisms 22 can be one or two. When there is one driving mechanism 22, the driving mechanism 22 drives the two correction modules 21 to move toward or away from each other along the first direction X. When there are two driving mechanisms 22, the two driving mechanisms 22 respectively drive the two correction modules 21 to move toward or away from each other along the first direction X.

[0086] Optionally, as shown in Figures 2 and 3, when there are two driving mechanisms 22, each driving mechanism 22 is connected to a correction module 21, and the driving mechanism 22 is used to drive the corresponding correction module 21 to move toward or away from another correction module 21.

[0087] When the shell 11 is loaded onto the press-fitting station, there is a large gap between the two correction modules 21. The shell 11 is placed in the clamping space between the two correction modules 21. The driving mechanism 22 drives the two correction modules 21 closer to each other so that the two correction modules 21 contact the two first side walls 111 respectively.

[0088] According to the press-fit correction device 200 of the embodiment of the present application, two correction modules 21 act on the two first side walls 111 with a larger area of ​​the shell 11, so that when the end cover 12 is pressed into the shell 11, the first side wall 111 is corrected, and the first side wall 111 is constrained to deform in a direction away from the interior of the shell 11, so that the shell 11 and the end cover 12 are reliably connected, thereby improving the yield rate of the press-fitted product.

[0089] 5 and 6 , according to some embodiments of the present application, each correction module 21 includes a base 211 and a correction block 212 disposed on the base 211 . Along the first direction X, the correction block 212 protrudes from the base 211 , and the correction block 212 is used to contact the first side wall 111 .

[0090] The base 211 serves as a positioning basis for the calibration block 212 . The base 211 may be located on a side of the calibration block 212 away from the first side wall 111 . The volume of the base 211 may be larger than that of the calibration block 212 .

[0091] The base 211 and the calibration block 212 can be separated to facilitate processing and manufacturing. The calibration block 212 can be connected to the base 211 in a variety of ways, for example, the calibration block 212 can be connected to the base 211 by snap connection, riveting connection, threaded connection, hot melt connection, welding connection, etc.

[0092] The correction block 212 protrudes from the base 211 along the first direction X, and the base 211 may have a first surface facing the first side wall 111, and the correction block 212 is protruded from the first surface. When the correction block 212 contacts the first side wall 111, the base 211 does not contact the first side wall 111. For example, when the correction module 21 is arranged at a position close to the opening of the shell 11, a part of the base 211 can be arranged at a position away from the shell 11, and the correction block 212 can contact the position close to the opening of the first side wall 111. Since the base 211 does not contact the first side wall 111, the interference between the base 211 and other components (such as press-fit components, end cover 12, etc.) can be reduced when the end cover 12 is assembled with the shell 11.

[0093] In the above scheme, the base 211 is used to provide a positioning basis for the correction block 212. The correction block 212 protrudes from the base 211. The base 211 may not contact the shell 11. The correction block 212 may be arranged near the opening of the shell 11 to reduce the interference between the base 211 and other components, so as to facilitate the end cover 12 to be pressed into the shell 11.

[0094] 2 and 5 , according to some embodiments of the present application, along the first direction X, the orthographic projection of the correction block 212 on the first sidewall 111 covers the first sidewall 111 along the second direction Y.

[0095] The orthographic projection of the correction block 212 on the first side wall 111 along the first direction X refers to the projection of the correction block 212 on the first side wall 111 when viewed along the first direction X.

[0096] The orthographic projection of the correction block 212 on the first side wall 111 covers the first side wall 111 in the second direction Y, which means that the size of the correction block 212 in the second direction Y can be equal to or larger than the size of the first side wall 111 in the second direction Y.

[0097] In the above solution, the correction block 212 has a larger size in the second direction Y and can cover the first side wall 111 in the second direction Y, so as to have a better restraining effect on the first side wall 111 in the second direction Y.

[0098] 2 and 5 , according to some embodiments of the present application, the calibration block 212 is in the shape of a cuboid, and the length direction of the calibration block 212 is parallel to the second direction Y.

[0099] The correction block 212 is a rectangular parallelepiped, the length direction of the correction block 212 is parallel to the second direction Y, and the width direction of the correction block 212 can be parallel to the third direction Z, so that the larger surface of the correction block 212 is set toward the first side wall 111, so that the correction block 212 has a larger contact area with the first side wall 111.

[0100] In the above scheme, the correction block 212 is a rectangular parallelepiped, and the length direction of the correction block 212 is parallel to the second direction Y. On the one hand, this enables the correction block 212 to have a larger contact area with the first side wall 111, so that the correction block 212 has a better restraining effect on the first side wall 111. On the other hand, it is easy to process and manufacture.

[0101] According to some embodiments of the present application, the calibration block 212 is detachably connected to the base 211 .

[0102] The connection method between the correction block 212 and the base 211 can be that the correction block 212 and the base 211 are threadedly connected, or the correction block 212 and the base 211 are snap-connected. For example, the correction block 212 is provided with a protrusion, and the base 211 is provided with a recessed portion corresponding to the protrusion, and the protrusion is embedded in the recessed portion.

[0103] Optionally, the correction block 212 is provided with a first mounting hole, the base 211 is provided with a second mounting hole, and the base 211 and the correction block 212 are threadedly connected via a screw member passing through the second mounting hole and the first mounting hole.

[0104] In the above solution, the calibration block 212 is detachably connected to the base 211 to facilitate replacement or adaption to battery cells 100 of different specifications.

[0105] 3 , 4 and 6 , according to some embodiments of the present application, there are multiple correction blocks 212 , and the multiple correction blocks 212 are arranged at intervals along the second direction Y.

[0106] The plurality of correction blocks 212 are spaced apart along the second direction Y. When viewed along the first direction X, the orthographic projections of the plurality of correction blocks 212 on the first side wall 111 cover the first side wall 111 in the second direction Y. In other words, the coverage of the plurality of correction blocks 212 in the second direction Y is greater than or equal to the size of the first side wall 111 in the second direction Y.

[0107] The multiple correction blocks 212 are arranged at intervals along the second direction Y. The multiple correction blocks 212 can be arranged at equal intervals along the second direction Y, or can be arranged at unequal intervals along the second direction Y.

[0108] The sizes of the plurality of correction blocks 212 may be equal or different along the second direction Y. In some embodiments, the sizes of the plurality of correction blocks 212 along the second direction Y are equal to facilitate manufacturing.

[0109] In the above solution, the plurality of correction blocks 212 are spaced apart along the second direction Y, so that the correction module 21 has a plurality of contact positions with the first side wall 111 in the second direction Y, thereby having a better restraining effect on the first side wall 111 .

[0110] 3 and 6 , according to some embodiments of the present application, the base 211 includes a plurality of protrusions 2111 , and each correction block 212 is disposed on one protrusion 2111 .

[0111] The protrusion 2111 is the basis for setting the correction block 212. Each correction block 212 is correspondingly arranged with a protrusion 2111, so that multiple protrusions 2111 can be arranged at intervals along the second direction Y.

[0112] A plurality of protrusions 2111 are located on a side of the base 211 facing the first side wall 111 to facilitate installation of the correction block 212 so that the correction block 212 can contact the first side wall 111 while the base 211 does not contact the first side wall 111 .

[0113] The plurality of protrusions 2111 may be arranged at equal intervals along the second direction Y to facilitate processing and manufacturing.

[0114] In the above solution, the base 211 includes a plurality of protrusions 2111 , and each protrusion 2111 corresponds to a correction block 212 , so as to facilitate the installation and positioning of the plurality of correction blocks 212 and reduce the weight of the base 211 .

[0115] According to some embodiments of the present application, each correction block 212 is detachably connected to the corresponding protrusion 2111 .

[0116] Each correction block 212 can be connected to the corresponding protrusion 2111 in various ways. For example, the correction block 212 is threadedly connected to the base 211, or the correction block 212 is snap-connected to the base 211. For example, the correction block 212 is provided with a protrusion 2111, and the base 211 is provided with a recessed portion corresponding to the protrusion 2111, and the protrusion 2111 is embedded in the recessed portion.

[0117] Optionally, the correction block 212 is provided with a first mounting hole, and the protrusion 2111 is provided with a second mounting hole corresponding to the first mounting hole. The second mounting hole is a through hole passing through the base 211 along the first direction X. The protrusion 2111 and the correction block 212 are threadedly connected by a threaded part (such as a bolt) passing through the second mounting hole and the first mounting hole.

[0118] In the above solution, each correction block 212 is detachably connected to the corresponding protrusion 2111 to facilitate replacement of the correction block 212 .

[0119] Please refer to Figure 6. According to some embodiments of the present application, multiple correction blocks 212 include two end correction blocks 2121 and at least one middle correction block 2122. The two end correction blocks 2121 are respectively arranged at the two ends of the base 211 along the second direction Y. Along the second direction Y, at least one middle correction block 2122 is located between the two end correction blocks 2121.

[0120] The two end correction blocks 2121 are respectively disposed at the two ends of the base 211 along the second direction Y. When viewed along the first direction X, the orthographic projections of the two end correction blocks 2121 on the first side wall 111 overlap with the two end edges of the first side wall 111 along the second direction Y, so that the two end correction blocks 2121 can correspond to the two ends of the first side wall 111 along the second direction Y. That is, along the second direction Y, one of the end correction blocks 2121 can extend beyond the corresponding end edge of the first side wall 111 in the second direction Y, or the end correction block 2121 can be flush with the corresponding end edge of the first side wall 111 in the second direction Y, so that the end correction block 2121 has a larger contact area with the corresponding end of the first side wall 111 in the second direction Y, thereby achieving a better restraining effect on the end of the first side wall 111.

[0121] The number of the middle correction blocks 2122 may be one, two, three or more. Optionally, as shown in FIG6 , the number of the middle correction blocks 2122 is three.

[0122] In some embodiments, the size of each correction block 212 in the second direction Y may be smaller than the size in the third direction Z. That is, each correction block 212 may be a rectangular parallelepiped, with the length of the correction block 212 parallel to the third direction Z and the width of the correction block 212 parallel to the second direction Y.

[0123] The surface of the correction block 212 that contacts the first side wall 111 may be a plane, so that the correction block 212 may have a larger contact area with the first side wall 111 .

[0124] In the above solution, the two end correction blocks 2121 and at least one middle correction block 2122 can respectively correspond to the end and middle of the first side wall 111 in the second direction Y, so as to have a better restraining effect on different parts of the first side wall 111.

[0125] According to some embodiments of the present application, along the first direction X, the projections of the multiple correction blocks 212 of the two correction modules 21 overlap with each other.

[0126] Along the first direction X, the projections of the multiple correction blocks 212 of the two correction modules 21 overlap with each other, which means that the multiple correction blocks 212 of the two correction modules 21 may completely overlap or partially overlap.

[0127] For example, the two correction modules 21 have the same structure and are symmetrically arranged about the perpendicular bisector of the line connecting the two correction modules 21. For another example, the two correction modules 21 have different structures and the multiple correction blocks 212 on the two correction modules 21 are staggered.

[0128] In the above solution, when viewed along the first direction X, the multiple correction blocks 212 of the two correction modules 21 overlap with each other, which facilitates processing and manufacturing, and the forces exerted on the housing 11 by the two correction modules 21 are balanced.

[0129] In other embodiments, the projections of the multiple correction blocks 212 of the two correction modules 21 are separated along the first direction X. That is, when viewed along the first direction X, the multiple correction blocks 212 of the two correction modules 21 do not overlap.

[0130] According to some embodiments of the present application, the base 211 is made of metal; and / or the calibration block 212 is made of polyoxymethylene.

[0131] The base 211 is made of metal, which has high strength. The base 211 may be made of, but is not limited to, stainless steel, aluminum, aluminum alloy, etc.

[0132] Polyoxymethylene (POM), also known as acetal resin, polyoxymethylene, or polyacetal, is a thermoplastic crystalline polymer known as "super steel" or "skinny steel." Acetal resin is a strong, rigid thermoplastic with excellent fatigue resistance and thermal stability. It also has a low coefficient of friction and excellent heat resistance. Polyoxymethylene offers high hardness, toughness, and a smooth surface, reducing damage to the housing 11.

[0133] According to some embodiments of the present application, embodiments of the present application further provide a battery manufacturing device, which includes the press-fit correction device 200 provided in any of the above embodiments.

[0134] The battery manufacturing equipment further includes a device for pressing the end cover 12 , which is used to press the end cover 12 into the opening of the shell 11 at a pressing station to close the opening.

[0135] The press-fitting calibration device 200 is installed at the press-fitting station. After the housing 11 is loaded onto the press-fitting station, the two calibration modules 21, driven by the drive mechanism 22, respectively contact the two first side walls 111. The press-fitting device for the end cap 12 presses the end cap 12 into the opening of the housing 11. During the press-fitting process, the calibration modules 21 act on the first side walls 111 to constrain deformation of the first side walls 111 away from the interior of the housing 11. This ensures a secure connection between the end cap 12 and the housing 11, improving the yield rate of the press-fitted product.

[0136] According to some embodiments of the present application, referring to Figures 1 to 6 , embodiments of the present application provide a press-fit correction device 200 for correcting the housing 11 when the end cap 12 of a battery cell 100 is pressed into the housing 11. The press-fit correction device 200 includes two correction modules 21 and a drive mechanism 22 , which are arranged opposite each other along a first direction X. The two correction modules 21 are configured to act on two first side walls 111. The drive mechanism 22 is configured to drive the two correction modules 21 toward or away from each other along the first direction X, so that each correction module 21 corrects the corresponding first side wall 111. Each correction module 21 includes a base 211 and a correction block 212 disposed on the base 211. The correction block 212 protrudes from the base 211 along the first direction X and is configured to contact the first side wall 111. Along the first direction X, the orthographic projection of the correction block 212 on the first side wall 111 covers the first side wall 111 in a second direction Y.

[0137] In some embodiments, each correction module 21 includes a correction block 212 . The correction block 212 is a rectangular parallelepiped, and the length direction of the correction block 212 is parallel to the second direction Y.

[0138] In some embodiments, each correction module 21 includes a plurality of correction blocks 212 , and the plurality of correction blocks 212 are spaced apart along the second direction Y. Along the first direction X, the projections of the plurality of correction blocks 212 of the two correction modules 21 overlap with each other.

[0139] In the above embodiment, the calibration block 212 is detachably connected to the base 211 to facilitate replacement of the calibration block 212 .

[0140] The above-mentioned press-fit correction device 200 is used to correct the first side wall 111 with a larger area of ​​the shell 11 through two correction modules 21. When the end cover 12 is pressed into the shell 11, the correction module 21 acts on the first side wall 111. The correction module 21 can constrain the first side wall 111 to constrain the first side wall 111 from deforming toward the outside of the shell 11, thereby reducing the probability of deformation of the first side wall 111, so that the product after the end cover 12 and the shell 11 are assembled has a higher yield rate.

[0141] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A press-fit correction device, used to correct the shell when the end cover of the battery cell is pressed into the shell, the shell comprises two first side walls arranged opposite to each other along a first direction and two second side walls arranged opposite to each other along a second direction, the second direction is perpendicular to the first direction, the area of ​​the first side wall is greater than the area of ​​the second side wall, the press-fit correction device comprises: Two correction modules are arranged opposite to each other along the first direction, and the two correction modules are used to act on the two first side walls; The driving mechanism is used to drive the two correction modules to move closer to or farther from each other along the first direction, so that each correction module corrects the corresponding first side wall.

2. The press-fit correction device according to claim 1, wherein: Each of the correction modules includes a base and a correction block disposed on the base. Along the first direction, the correction block protrudes from the base, and the correction block is used to contact the first side wall.

3. The press-fit correction device according to claim 2, wherein: Along the first direction, the orthographic projection of the correction block on the first side wall covers the first side wall in the second direction.

4. The press-fit correction device according to claim 3, wherein: The correction block is in the shape of a cuboid, and a length direction of the correction block is parallel to the second direction.

5. The press-fit correction device according to claim 4, wherein: The correction block is detachably connected to the base.

6. The press-fit correction device according to claim 2, wherein: There are multiple correction blocks, and the multiple correction blocks are arranged at intervals along the second direction.

7. The press-fit correction device according to claim 6, wherein: The base includes a plurality of protrusions, and each of the correction blocks is arranged on one of the protrusions.

8. The press-fit correction device according to claim 7, wherein: Each of the correction blocks is detachably connected to the corresponding protrusion.

9. The press-fit correction device according to any one of claims 6 to 8, wherein: The multiple correction blocks include two end correction blocks and at least one middle correction block. The two end correction blocks are respectively arranged at two ends of the base along the second direction. Along the second direction, the at least one middle correction block is located between the two end correction blocks.

10. The press-fit correction device according to any one of claims 6 to 9, wherein: Along the first direction, projections of the multiple correction blocks of the two correction modules overlap with each other.

11. The press-fit correction device according to any one of claims 2 to 10, wherein: The base is made of metal; and / or The material of the calibration block is polyoxymethylene.

12. A battery manufacturing device, comprising the press-fit correction device according to any one of claims 1 to 11.

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