A multi-plate cylindrical pole core, a multi-plate cylindrical battery core and a manufacturing method thereof

Abstract

The application provides a multi-pole piece cylindrical battery cell, which comprises a battery cell shell, a positive electrode top cover assembly, a negative electrode insulation assembly and a multi-pole piece cylindrical battery core; wherein the multi-pole piece cylindrical battery core is arranged in the battery cell shell; the negative electrode reel assembly of the multi-pole piece cylindrical battery core is arranged opposite to the negative electrode end of the battery cell shell; the negative electrode insulation assembly is arranged in the gap between the negative electrode reel assembly of the multi-pole piece cylindrical battery core and the negative electrode end of the battery cell shell; the positive electrode top cover assembly is connected to the positive electrode reel assembly of the multi-pole piece cylindrical battery core, and the positive electrode top cover assembly is partially connected to the positive electrode end of the battery cell shell. The multi-pole piece cylindrical battery core provided by the application replaces the traditional pole piece to transfer current through the pole lug, improves the overcurrent capacity, directly welds the welding disc with the top cover, reduces the roller groove space required for reserving the pole lug and fixing the battery cell, and improves the utilization rate of the internal space of the battery cell.

Description

Technical Field

[0001] This specification relates to the field of cylindrical battery technology, and more particularly to a multi-electrode cylindrical electrode core, a multi-electrode cylindrical cell, and a method for manufacturing the same. Background Technology

[0002] Currently, lithium-ion battery cells are broadly categorized structurally into prismatic cells, cylindrical cells, and pouch cells. Among these, cylindrical cells exhibit excellent mechanical properties, demonstrating the strongest resistance to deformation during charging and discharging compared to the other two forms. Furthermore, their size and specifications are relatively easy to standardize, facilitating the platformization of battery systems. Additionally, due to their low single-cell energy, the failure mode of cylindrical cells is easier to control in the event of an accident. However, precisely because of their low single-cell energy, a single battery system in an electric vehicle scenario requires a large number of cylindrical cells, increasing the complexity of the battery system and raising the cost of both the mechanical and management systems compared to other cell structures. Therefore, in recent years, major battery and vehicle manufacturers have shifted their focus to larger-capacity cylindrical cells. As cell capacity increases, the requirements for overcurrent capacity also increase. Existing manufacturing processes can no longer meet these requirements; therefore, the common approach is to flatten the wound core to form full tabs. However, the current technology has the problem that the shape of the flattened tabs is not well controlled, and the surface morphology is difficult to weld directly to the top cover. Therefore, it is usually necessary to weld the current collector to the top cover. The full tabs and the welded current collector make the processing technology complicated, and the available space in the battery cavity is relatively small, which leads to a decrease in battery energy density. Summary of the Invention

[0003] In view of this, the purpose of one or more embodiments of this specification is to provide a multi-electrode cylindrical core, a multi-electrode cylindrical cell and a manufacturing method to solve the problem that the available space in the battery cavity of a multi-tab battery is relatively small, which leads to a decrease in battery energy density.

[0004] Based on the above objectives, one or more embodiments of this specification provide a multi-pole cylindrical electrode core, the multi-pole cylindrical electrode core comprising: a positive electrode winding assembly, the positive electrode winding assembly comprising a plurality of positive electrode winding needles and a positive electrode welding disk, each of the positive electrode winding needles being disposed on the positive electrode welding disk, a first receiving space being provided between every two positive electrode winding needles, and each positive electrode winding needle having a positive electrode conductive surface and at least one positive electrode insulating surface;

[0005] A negative electrode winding assembly includes a plurality of negative electrode winding needles and a negative electrode bonding pad. The number of negative electrode winding needles is the same as the number of positive electrode winding needles. Each negative electrode winding needle is disposed on the negative electrode bonding pad and has a negative electrode conductive surface and at least one negative electrode insulating surface.

[0006] The positive electrode winding assembly is inserted into the negative electrode winding assembly so that a negative electrode winding needle is located within a first receiving space;

[0007] The negative conductive surface of each negative electrode coil is positioned opposite to the positive insulating surface of its adjacent positive electrode coil.

[0008] The positive conductive surface of each positive electrode coil is positioned opposite to the negative insulating surface of its adjacent negative electrode coil.

[0009] Optionally, a second receiving space is provided between the negative conductive surface of one of the negative electrode winding needles and its adjacent positive electrode winding needle; a third receiving space is provided between the positive conductive surface of one of the positive electrode winding needles and its adjacent negative electrode winding spool.

[0010] The multi-electrode cylindrical core further includes: a plurality of positive electrode assemblies, the number of which is the same as the number of positive electrode winding needles, the positive electrode assemblies being disposed within the third accommodating space, each positive electrode assembly having an uncoated positive electrode area, the uncoated positive electrode area being in contact with the positive conductive surface of one of the positive electrode winding needles and in contact with the negative insulating surface of one of the negative electrode winding needles;

[0011] Multiple negative electrode assemblies, the number of which is the same as the number of negative electrode winding needles, are disposed within the second receiving space. Each negative electrode assembly has an uncoated area, which is in contact with the negative conductive surface of one of the negative electrode winding needles and with the positive insulating surface of one of the positive electrode winding needles.

[0012] Optionally, the positive electrode assembly includes a positive electrode and a positive electrode separator, wherein the positive electrode and the positive electrode separator are arranged adjacent to each other.

[0013] The negative electrode assembly includes a negative electrode sheet and a negative electrode separator, which are arranged adjacent to each other.

[0014] This specification also provides one or more embodiments of a multi-pole cylindrical battery cell, the multi-pole cylindrical battery cell comprising: a cell shell, a positive electrode top cover assembly, a negative electrode insulation assembly, and the aforementioned multi-pole cylindrical electrode core; wherein...

[0015] The multi-pole cylindrical electrode core is disposed inside the cell housing;

[0016] The negative electrode winding assembly of the multi-electrode cylindrical electrode core is arranged opposite to the negative terminal of the cell shell;

[0017] The negative electrode insulation component is disposed in the gap between the negative electrode winding assembly of the multi-electrode cylindrical electrode core and the negative end of the cell shell.

[0018] The positive electrode top cover assembly is connected to the positive electrode reel assembly of the multi-electrode cylindrical electrode core, and the positive electrode top cover assembly is partially connected to the positive terminal of the cell casing.

[0019] Optionally, the multi-pole cylindrical cell further includes a sensor assembly, which is disposed on any one of the positive electrode winding needles.

[0020] This specification provides one or more embodiments of a method for manufacturing a multi-electrode cylindrical electrode core, the method comprising:

[0021] The positive electrode reel assembly and the negative electrode reel assembly are inserted together, wherein...

[0022] The positive electrode winding assembly includes a plurality of positive electrode winding needles and a positive electrode welding disk. Each of the positive electrode winding needles is disposed on the positive electrode welding disk. There is a first receiving space between every two positive electrode winding needles. Each positive electrode winding needle has a positive electrode conductive surface and at least one positive electrode insulating surface.

[0023] The negative electrode winding assembly includes a plurality of negative electrode winding needles and a negative electrode welding disk. The number of negative electrode winding needles is the same as the number of positive electrode winding needles. Each negative electrode winding needle is disposed on the negative electrode welding disk. Each negative electrode winding needle has a negative electrode conductive surface and at least one negative electrode insulating surface.

[0024] The positive electrode winding assembly is inserted into the negative electrode winding assembly so that a negative electrode winding needle is located within a first receiving space;

[0025] The negative conductive surface of each negative electrode coil is positioned opposite to the positive insulating surface of its adjacent positive electrode coil.

[0026] The positive conductive surface of each positive electrode coil is positioned opposite to the negative insulating surface of its adjacent negative electrode coil.

[0027] Optionally, before inserting the positive electrode reel assembly into the negative electrode reel assembly, the method for manufacturing the multi-electrode cylindrical electrode core further includes:

[0028] A positive electrode assembly is inserted into a third receiving space, so that each third receiving space contains a positive electrode assembly;

[0029] A negative electrode assembly is inserted into a second receiving space, such that each second receiving space contains one negative electrode assembly; wherein...

[0030] The uncoated area of ​​the positive electrode sheet is attached to the positive conductive surface, and the uncoated area of ​​the negative electrode sheet is attached to the negative conductive surface.

[0031] Optionally, the method for manufacturing the multi-pole cylindrical core further includes:

[0032] The positive electrode winding assembly and the negative electrode winding assembly are used as axes to wind the components, so that multiple positive electrode sheet assemblies and multiple negative electrode sheet assemblies surround the outside of the positive electrode winding assembly and the negative electrode winding assembly.

[0033] This specification also provides one or more embodiments of a method for manufacturing a multi-polar cylindrical battery cell, the method comprising:

[0034] The multi-pole cylindrical electrode core is fabricated using the above-described method.

[0035] Place the negative electrode insulation component inside the cell casing;

[0036] Insert the negative electrode of the multi-pole cylindrical electrode core inward into the cell casing;

[0037] Place the positive electrode top cover assembly on the outside of the positive electrode of the multi-electrode cylindrical electrode core;

[0038] The opening end of the battery cell casing is bent inward using a folding and sealing device to press down the positive electrode top cover assembly.

[0039] Optionally, after inserting the negative electrode of the multi-pole cylindrical electrode core inward into the cell housing, the method further includes:

[0040] The sensor assembly's wires are passed through the positive electrode top cover assembly and connected to an external control system.

[0041] This application has at least the following beneficial technical effects:

[0042] Based on the use of positive and negative electrode reels in the multi-electrode cylindrical cell of this application, multiple electrodes can be wound simultaneously. Each individual electrode can independently conduct current, and the current input and output are achieved through the reels, resulting in a large current-carrying area. Simultaneous winding of multiple electrodes improves winding efficiency. Furthermore, the welding pads of the positive and negative electrode reels can be directly welded to the top cover and housing, eliminating the need for welding current collectors and leaving space for electrode tabs, thus making the cell structure more compact. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in one or more embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1This is a schematic diagram of the structure of a multi-pole cylindrical battery cell provided in one or more embodiments of this specification;

[0045] Figure 2 A three-dimensional schematic diagram of a multi-pole cylindrical battery cell provided in one or more embodiments of this specification;

[0046] Figure 3 This is a schematic diagram of the positive electrode reel assembly structure provided in one or more embodiments of this specification;

[0047] Figure 4 for Figure 5 Enlarged view of the circled area;

[0048] Figure 5 A schematic diagram illustrating the connection between the positive electrode reel assembly and the negative electrode reel assembly provided in one or more embodiments of this specification;

[0049] Figure 6 A schematic cross-sectional view of the positive electrode assembly and negative electrode assembly after being connected according to one or more embodiments of this specification;

[0050] Figure 7 This is a schematic diagram of the winding step in the method for manufacturing a multi-pole cylindrical pole core provided in one or more embodiments of this specification.

[0051] The reference numerals in the attached figures are explained as follows:

[0052] 1-Cell casing; 2-Positive electrode top cover assembly; 21-Positive electrode top cover; 22-Positive electrode insulating component; 3-Negative electrode insulating assembly; 4-Multi-electrode cylindrical electrode core; 41-Positive electrode reel assembly; 411-Positive electrode winding needle; 4111-Positive electrode conductive surface; 4112-Positive electrode insulating surface; 412-Positive electrode welding pad; 42-Negative electrode reel assembly; 421-Negative electrode winding needle; 422-Negative electrode welding pad; 43-Positive electrode assembly; 431-Positive electrode sheet; 432-Positive electrode insulating sheet; 44-Negative electrode assembly; 441-Negative electrode sheet; 442-Negative electrode insulating sheet; 5-Sensor assembly; 6-External control system. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0054] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] Figure 1 This is a schematic diagram of the structure of a multi-pole cylindrical battery cell provided in one or more embodiments of this specification;

[0056] Figure 2 This is a three-dimensional schematic diagram of a multi-pole cylindrical battery cell provided in one or more embodiments of this specification.

[0057] Reference Figure 1 and 2 One embodiment of this application provides a multi-pole cylindrical battery cell, which includes: a battery cell housing 1, a positive electrode top cover assembly 2, a negative electrode insulation assembly 3, and a multi-pole cylindrical electrode core 4; wherein,

[0058] The multi-electrode cylindrical electrode core 4 is disposed inside the cell housing 1;

[0059] The negative electrode winding assembly 42 of the multi-electrode cylindrical electrode core 4 is arranged opposite to the negative terminal of the cell housing 1;

[0060] The negative electrode insulation component 3 is disposed in the gap between the negative electrode winding assembly 42 of the multi-electrode cylindrical electrode core 4 and the negative end of the cell shell 1.

[0061] The positive electrode top cover assembly 2 is connected to the positive electrode reel assembly 41 of the multi-electrode cylindrical electrode core 4, and part of the positive electrode top cover assembly 2 is connected to the positive terminal of the cell shell 1.

[0062] The multi-pole cylindrical electrode core 4 proposed in this application replaces the traditional electrode plates that transmit current through the electrode tabs. While improving the current carrying capacity, it can be directly welded to the top cover with a welding pad, reducing the roller groove space required for reserving electrode tabs and fixing the battery cell, and improving the utilization rate of the internal space of the battery cell.

[0063] In one embodiment, the positive electrode top cover assembly 2 includes a positive electrode top cover 21 and a positive electrode insulating member 22;

[0064] The positive electrode insulating component 22 is circumferentially sleeved on the positive electrode top cover 21. The positive electrode insulating component 22 is used to insulate between the cell outer shell 1 and the positive electrode top cover 21. The positive electrode top cover 21 is connected to the positive electrode reel assembly 41 of the multi-electrode cylindrical electrode core 4 and conducts current outward.

[0065] Figure 3 This is a schematic diagram of the positive electrode reel assembly structure provided in one or more embodiments of this specification;

[0066] Figure 4 for Figure 5 Enlarged view of the circled area;

[0067] Figure 5 A schematic diagram illustrating the connection between the positive electrode reel assembly and the negative electrode reel assembly provided in one or more embodiments of this specification;

[0068] Figure 6 This is a schematic cross-sectional view of the positive electrode assembly and negative electrode assembly after being connected, provided in one or more embodiments of this specification.

[0069] Reference Figure 3-6 In one embodiment, the multi-pole cylindrical core 4 includes: a positive electrode reel assembly 41 and a negative electrode reel assembly 42;

[0070] The positive electrode winding assembly 41 includes a plurality of positive electrode winding needles 411 and a positive electrode welding disk 412. Each positive electrode winding needle 411 is disposed on the positive electrode welding disk 412. There is a first receiving space between every two positive electrode winding needles 411. Each positive electrode winding needle 411 has a positive electrode conductive surface 4111 and at least one positive electrode insulating surface 4112.

[0071] The negative electrode winding assembly 42 includes a plurality of negative electrode winding needles 421 and a negative electrode bonding pad 422. The number of negative electrode winding needles 421 is the same as the number of positive electrode winding needles 411. Each negative electrode winding needle 421 is disposed on the negative electrode bonding pad 422. Each negative electrode winding needle 421 has a negative electrode conductive surface (not shown) and at least one negative electrode insulating surface (not shown).

[0072] The positive electrode winding assembly 41 is inserted into the negative electrode winding assembly 42 so that a negative electrode winding needle 421 is located in a first receiving space;

[0073] The negative conductive surface of each negative electrode winding needle 421 is arranged opposite to the positive insulating surface 4112 of its adjacent positive electrode winding needle.

[0074] The positive conductive surface 4111 of each positive electrode winding needle 411 is positioned opposite to the negative insulating surface of its adjacent negative electrode winding needle.

[0075] The use of positive electrode spool 41 and negative electrode spool 42 greatly increases the current-carrying area and allows for the simultaneous installation of multiple electrode plates, further increasing the battery capacity. Meanwhile, the positive electrode welding pad 412 and negative electrode welding pad 422 can be directly welded to the top cover and casing, eliminating the need for welding current collectors and leaving space for folding tabs, thus making the cell structure more compact.

[0076] Specifically, the negative electrode coil 421 and the positive electrode coil 411 have the same structure. The following detailed description uses the positive electrode coil 411 as an example. The positive electrode welding pad 412 is as follows... Figure 5 The shape shown can be any shape, such as cylindrical or frustum, when used in cylindrical batteries. Of course, it can also be a polyhedron when used in batteries of other shapes. In general, the positive electrode welding disk 412 is used to fix multiple positive electrode coils 411 and conduct current. As long as the above requirements are met, the material and shape can be set arbitrarily according to the requirements.

[0077] The positive electrode coil needle 411 is located on one side of the negative electrode welding pad 422, and its number can be adjusted according to the battery performance, preferably 2-8. For example... Figure 5 As shown, the conductive surface and the opposite surface of the positive electrode coil 411 are inclined slopes, and the end closer to the positive electrode welding pad is wider than the end farther from the welding pad, making the side surface appear as... Figure 5 The shape shown allows for a tighter contact between the positive and negative electrode coils during the insertion process, as the insertion depth increases.

[0078] For example:

[0079] When used in lithium-ion batteries, the positive electrode winding assembly 41 is made of aluminum, and the negative electrode winding needle is made of copper-aluminum composite. Alternatively, the negative electrode welding pad can be made of copper-aluminum composite material, with the side away from the negative electrode winding needle made of aluminum and the side closer to the negative electrode winding needle made of copper, and the negative electrode winding needle made of copper. Or, the negative electrode welding pad can be made of aluminum and the negative electrode winding needle can be made of copper.

[0080] When used in sodium-ion batteries, both the positive and negative electrodes are aluminum spools.

[0081] When used in solid-state batteries, the positive electrode separator and the negative electrode separator are solid electrolytes. Alternatively, the positive electrode separator and the positive electrode sheet can be combined into a single "sheet" through processes such as pressing or coating. The negative electrode can be a negative electrode sheet or a lithium foil.

[0082] In one embodiment, a second receiving space is provided between the negative conductive surface of a negative electrode winding needle 421 and its adjacent positive electrode winding needle 411; a third receiving space is provided between the positive conductive surface 4111 of a positive electrode winding needle 411 and its adjacent negative electrode winding spool.

[0083] The multi-electrode cylindrical core 4 further includes: multiple positive electrode assembly 43 and multiple negative electrode assembly 44;

[0084] The number of positive electrode assembly 43 is the same as the number of positive electrode winding needles 411. The positive electrode assembly 43 is disposed in the third receiving space. The positive electrode assembly 43 has a positive electrode uncoated area. The positive electrode uncoated area is in contact with the positive electrode conductive surface 4111 of a positive electrode winding needle 411 and in contact with the negative electrode insulating surface of a negative electrode winding needle 421.

[0085] The number of negative electrode assembly 44 is the same as the number of negative electrode winding needles 421. The negative electrode assembly 44 is disposed in the second receiving space. The negative electrode assembly 44 has an uncoated negative electrode area. The uncoated negative electrode area is in contact with the negative conductive surface of a negative electrode winding needle 421 and in contact with the positive insulating surface 4112 of a positive electrode winding needle 411.

[0086] Specifically, negative electrode winding needle 421 and positive electrode winding needle 411 are used to replace the traditional electrode tabs, so that multiple electrode pieces can be wound at the same time. Each individual electrode piece can conduct current independently, and the input and output of current are carried out by the winding shaft, so as to achieve a large current-carrying area and to wind multiple electrode pieces at the same time, thereby improving winding efficiency.

[0087] In one embodiment, reference is made to Figure 6 The positive electrode assembly 43 includes a positive electrode 431 and a positive electrode separator 432, which are arranged adjacent to each other.

[0088] The negative electrode assembly 44 includes a negative electrode 441 and a negative electrode separator 442, which are arranged adjacent to each other.

[0089] Specifically, the number of positive electrode assembly 43 and negative electrode assembly 44 is the same. The positive electrode assembly 43 and negative electrode assembly 44 are arranged alternately, and the specific positional relationship is as follows: positive electrode 431, positive electrode separator 432, negative electrode 441, and negative electrode separator 442 are arranged in sequence and wound around the outside of the positive electrode winding assembly 41 and the negative electrode winding assembly 42.

[0090] In one embodiment, the multi-pole cylindrical cell further includes a sensor assembly 5, which is disposed on any one of the positive electrode winding needles 411 and electrically connected to an external control system.

[0091] This application innovatively proposes a positive electrode reel and a negative electrode reel for the multi-electrode cylindrical battery cell. The multi-electrode is fixed by inserting the positive and negative electrode reels. The contact surfaces between the positive and negative electrode reels and the multi-electrode serve as current conduction surfaces, achieving a large current-carrying area. The multi-electrode is wound simultaneously, improving winding efficiency. The welding disk at the top of the reel can be directly used as a pole post to be welded to the top cover and the housing, making the battery cell structure more compact.

[0092] Sensor assembly 5 includes a pressure sensor and a temperature sensor, used to acquire temperature and pressure signals and send them to an external control system 6.

[0093] Figure 5 A schematic diagram illustrating the connection between the positive electrode reel assembly and the negative electrode reel assembly provided in one or more embodiments of this specification;

[0094] Figure 6 A schematic cross-sectional view of the positive electrode assembly and negative electrode assembly after being connected according to one or more embodiments of this specification;

[0095] Figure 7 This is a schematic diagram of the winding step in the method for manufacturing a multi-pole cylindrical pole core provided in one or more embodiments of this specification.

[0096] Another embodiment of this application provides a method for manufacturing a multi-electrode cylindrical electrode core 4, the method comprising:

[0097] The positive electrode winding assembly 41 and the negative electrode winding assembly 42 are inserted together, wherein...

[0098] The positive electrode winding assembly 41 includes a plurality of positive electrode winding needles 411 and a positive electrode welding disk 412. Each positive electrode winding needle 411 is disposed on the positive electrode welding disk 412. There is a first receiving space between every two positive electrode winding needles 411. Each positive electrode winding needle 411 has a positive electrode conductive surface 4111 and at least one positive electrode insulating surface 4112.

[0099] The negative electrode winding assembly 42 includes a plurality of negative electrode winding needles 421 and a negative electrode welding disk 422. The number of negative electrode winding needles 421 is the same as the number of positive electrode winding needles 411. Each negative electrode winding needle 421 is disposed on the negative electrode welding disk 422. The negative electrode winding needle 421 has a negative electrode conductive surface and at least one negative electrode insulating surface.

[0100] The positive electrode winding assembly 41 is inserted into the negative electrode winding assembly 42 so that a negative electrode winding needle 421 is located in a first receiving space;

[0101] The negative conductive surface of each negative electrode winding needle 421 is arranged opposite to the positive insulating surface 4112 of its adjacent positive electrode winding needle.

[0102] The positive conductive surface 4111 of each positive electrode winding needle 411 is positioned opposite to the negative insulating surface of its adjacent negative electrode winding needle.

[0103] In one embodiment, before inserting the positive electrode reel assembly 41 and the negative electrode reel assembly 42, the method for manufacturing the multi-electrode cylindrical electrode core 4 further includes:

[0104] A positive electrode assembly 43 is inserted into a third receiving space, so that each third receiving space has a positive electrode assembly 43;

[0105] A negative electrode assembly 44 is inserted into a second receiving space, such that each second receiving space contains a negative electrode assembly 44; wherein...

[0106] The uncoated area of ​​the positive electrode 431 is bonded to the positive conductive surface 4111, and the uncoated area of ​​the negative electrode 441 is bonded to the negative conductive surface.

[0107] In one embodiment, the method for fabricating the multi-pole cylindrical core 4 further includes:

[0108] The positive electrode winding assembly 41 and the negative electrode winding assembly 42 are used as axes for winding, so that multiple positive electrode sheet assemblies 43 and multiple negative electrode sheet assemblies 44 surround the outside of the positive electrode winding assembly 41 and the negative electrode winding assembly 42.

[0109] For example, refer to Figure 7 Rotate the positive electrode winding assembly 41 and the negative electrode winding assembly 42 so that a plurality of positive electrode sheet assemblies 43 and a plurality of negative electrode sheet assemblies 44 surround the outside of the positive electrode winding assembly 41 and the negative electrode winding assembly 42.

[0110] Another embodiment of this application provides a method for manufacturing a multi-polar cylindrical battery cell, the method comprising:

[0111] The multi-pole cylindrical core 4 is fabricated using the above-described method.

[0112] Place the negative electrode insulation component 3 into the cell casing 1;

[0113] Insert the negative electrode of the multi-pole cylindrical electrode core 4 into the cell casing 1;

[0114] Place the positive electrode top cover assembly 2 on the outside of the positive electrode of the multi-electrode cylindrical electrode core 4;

[0115] Use a folding and sealing device to bend the open end of the cell casing 1 inward to press down the positive electrode top cover assembly 2.

[0116] In one embodiment, the bottom of the battery cell housing 1 has a first through hole, and the positive electrode top cover assembly 2 has a second through hole;

[0117] The method for manufacturing multi-electrode cylindrical cells further includes:

[0118] Insert the negative electrode welding pad 422 of the multi-electrode cylindrical electrode core 4 into the first through hole, so that the outer surface of the negative electrode welding pad 422 is flush with the outer shell 1 of the cell, and seal the contact gap between the outer surface of the negative electrode welding pad 422 and the outer shell using laser welding.

[0119] The outer surface of the positive electrode welding pad 412 is passed through the second through hole, and the contact gap between the outer surface of the positive electrode welding pad 412 and the positive electrode top cover assembly 2 is sealed by laser welding.

[0120] In one embodiment, the sensor assembly 5 is pre-installed on the positive electrode winding needle 411 during the manufacturing of the positive electrode winding needle 411. In one embodiment, after inserting the negative electrode of the multi-electrode cylindrical electrode core 4 into the cell housing 1, the process further includes:

[0121] The wires of the sensor assembly 5 are passed through the positive electrode top cover assembly 2 and connected to the external control system 6.

[0122] The positive electrode insulator 22 has a through hole. After the negative electrode of the multi-electrode cylindrical core 4 is inserted into the battery cell housing 1, the wire of the sensor assembly 5 is passed through the through hole and connected to the external control system 6, and the through hole is sealed.

[0123] The cylindrical battery proposed in this embodiment has the following advantages:

[0124] (1) It innovatively proposed positive and negative electrode reels and used the positive and negative electrode reels to fix the multi-electrode plates by plugging them together;

[0125] (2) The contact surfaces between the positive and negative electrode reels and the electrode plates serve as current conduction surfaces, achieving a large current-carrying area;

[0126] (3) Wind the multi-pole sheets simultaneously to improve winding efficiency;

[0127] (4) The welding plate at the top of the reel can be directly used as a pole post to weld to the top cover and the shell, making the cell structure more compact;

[0128] (5) Built-in sensor enables fast and accurate battery detection.

[0129] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this specification as described above, which are not provided in detail for the sake of brevity.

[0130] Additionally, to simplify the description and discussion, and to avoid obscuring one or more embodiments of this specification, well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring one or more embodiments of this specification, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which one or more embodiments of this specification will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this disclosure, it will be apparent to those skilled in the art that one or more embodiments of this specification may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0131] Although this disclosure has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0132] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

Claims

1. A multi-plate cylindrical pole core, characterized by, The multi-pole piece cylindrical pole core (4) comprises: A positive pole winding shaft assembly (41) comprising a plurality of positive pole winding shafts (411) and a positive pole welding disc (412), each of the positive pole winding shafts (411) is arranged on the positive pole welding disc (412), and each two positive pole winding shafts (411) have a first accommodating space therebetween, each of the positive pole winding shafts (411) has a positive pole conductive surface (4111) and at least one positive pole insulating surface (4112); A negative pole winding shaft assembly (42) comprising a plurality of negative pole winding shafts (421) and a negative pole welding disc (422), the number of the negative pole winding shafts (421) is the same as that of the positive pole winding shafts (411), each of the negative pole winding shafts (421) is arranged on the negative pole welding disc (422), and the negative pole winding shaft (421) has a negative pole conductive surface and at least one negative pole insulating surface; wherein The positive pole winding shaft assembly (41) and the negative pole winding shaft assembly (42) are inserted to make one negative pole winding shaft (421) located in one first accommodating space; The negative pole conductive surface of each of the negative pole winding shafts (421) is oppositely arranged with the positive pole insulating surface (4112) of the adjacent positive pole winding shaft; The positive pole conductive surface (4111) of each of the positive pole winding shafts (411) is oppositely arranged with the negative pole insulating surface of the adjacent negative pole winding shaft; Wherein, the negative pole conductive surface of one of the negative pole winding shafts (421) and the adjacent positive pole winding shaft (411) have a second accommodating space; the positive pole conductive surface (4111) of one of the positive pole winding shafts (411) and the adjacent negative pole winding shaft have a third accommodating space; The multi-pole piece cylindrical pole core (4) further comprises: A plurality of positive pole piece assemblies (43) having the same number as that of the positive pole winding shafts (411), the positive pole piece assemblies (43) are arranged in the third accommodating space, and the positive pole piece assemblies (43) have a positive pole piece uncoated area which is in contact with the positive pole conductive surface (4111) of one of the positive pole winding shafts (411) and the negative pole insulating surface of one of the negative pole winding shafts (421); A plurality of negative pole piece assemblies (44) having the same number as that of the negative pole winding shafts (421), the negative pole piece assemblies (44) are arranged in the second accommodating space, and the negative pole piece assemblies (44) have a negative pole piece uncoated area which is in contact with the negative pole conductive surface of one of the negative pole winding shafts (421) and the positive pole insulating surface (4112) of one of the positive pole winding shafts (411).

2. The multi-pole piece cylindrical pole core of claim 1, wherein The positive pole piece assembly (43) comprises a positive pole piece (431) and a positive pole isolation piece (432), and the positive pole piece (431) and the positive pole isolation piece (432) are arranged adjacently. The negative sheet assembly (44) comprises a negative sheet (441) and a negative separator sheet (442), and the negative sheet (441) and the negative separator sheet (442) are arranged adjacently.

3. A multi-segment cylindrical cell, characterized by, The multi-sheet cylindrical battery cell comprises a battery cell shell (1), a positive top cover assembly (2), a negative insulation assembly (3), and the multi-sheet cylindrical battery core (4) according to any one of claims 1 to 2; wherein, The multi-sheet cylindrical battery core (4) is arranged in the battery cell shell (1); The negative reel assembly (42) of the multi-sheet cylindrical battery core (4) is arranged opposite to the negative end of the battery cell shell (1); The negative insulation assembly (3) is arranged in the gap between the negative reel assembly (42) of the multi-sheet cylindrical battery core (4) and the negative end of the battery cell shell (1); The positive top cover assembly (2) is connected to the positive reel assembly (41) of the multi-sheet cylindrical battery core (4), and the positive top cover assembly (2) is partially connected to the positive end of the battery cell shell (1).

4. The multi-segment cylindrical cell of claim 3, wherein, The multi-sheet cylindrical battery cell further comprises a sensor assembly (5) arranged on any one of the positive winding needles (411).

5. A method of making a multi-segment cylindrical core as claimed in any one of claims 1-2, characterized in that, The manufacturing method of the multi-sheet cylindrical battery core comprises: The positive reel assembly (41) and the negative reel assembly (42) are inserted, wherein, The positive reel assembly (41) comprises a plurality of positive winding needles (411) and a positive welding disc (412), each of the positive winding needles (411) is arranged on the positive welding disc (412), and each two positive winding needles (411) have a first accommodating space therebetween, each of the positive winding needles (411) has a positive conductive surface (4111) and at least one positive insulating surface (4112); The negative reel assembly (42) comprises a plurality of negative winding needles (421) and a negative welding disc (422), the number of the negative winding needles (421) is the same as that of the positive winding needles (411), each of the negative winding needles (421) is arranged on the negative welding disc (422), and the negative winding needle (421) has a negative conductive surface and at least one negative insulating surface; The positive reel assembly (41) and the negative reel assembly (42) are inserted so that one negative winding needle (421) is located in one first accommodating space; The negative conductive surface of each of the negative winding needles (421) is arranged opposite to the positive insulating surface (4112) of the adjacent positive winding needle; The positive conductive surface (4111) of each of the positive winding needles (411) is arranged opposite to the negative insulating surface of the adjacent negative winding needle.

6. The method of making a multi-plate cylindrical core of claim 5 wherein, Before the positive reel assembly (41) and the negative reel assembly (42) are inserted, the manufacturing method of the multi-sheet cylindrical battery core further comprises: One positive sheet assembly (43) is inserted into one third accommodating space so that each third accommodating space has one positive sheet assembly (43) therein; One negative sheet assembly (44) is inserted into one second accommodating space so that each second accommodating space has one negative sheet assembly (44) therein; wherein, The positive electrode sheet (431) uncoated area is attached to the positive electrode conductive surface (4111), and the negative electrode sheet (441) uncoated area is attached to the negative electrode conductive surface.

7. The method of making a multi-plate cylindrical core of claim 6 wherein, The method for manufacturing the multi-electrode sheet cylindrical core further comprises: Winding around the positive electrode spool assembly (41) and the negative electrode spool assembly (42) as the axis, so that multiple positive electrode sheet assemblies (43) and multiple negative electrode sheet assemblies (44) are wrapped outside the positive electrode spool assembly (41) and the negative electrode spool assembly (42).

8. A method of making a multi-pole cylindrical cell as claimed in any one of claims 3 to 4, wherein, The method for manufacturing the multi-electrode sheet cylindrical core comprises: Manufacturing the multi-electrode sheet cylindrical core (4) by using the method for manufacturing the multi-electrode sheet cylindrical core according to any one of claims 5 to 7; Placing the negative electrode insulation assembly (3) into the core shell (1); Inserting the negative electrode of the multi-electrode sheet cylindrical core (4) into the core shell (1) inwardly; Placing the positive electrode top cover assembly (2) outside the positive electrode of the multi-electrode sheet cylindrical core (4); Using a folding sealing device to fold the opening end of the core shell (1) inwardly, and press the positive electrode top cover assembly (2).

9. The method of claim 8, wherein the plurality of electrode plates are arranged in a circular pattern. The method for manufacturing the multi-electrode sheet cylindrical core (4) further comprises: Connecting the lead wire of the sensor assembly (5) to the external control system through the positive electrode top cover assembly (2). The method for manufacturing the multi-electrode sheet cylindrical core (4) further comprises: Connecting the lead wire of the sensor assembly (5) to the external control system through the positive electrode top cover assembly (2).

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