Cylindrical secondary battery
The cylindrical secondary battery design with a conductive plate rivet head and integrated venting mechanism addresses the complexity and cost issues of existing lithium-ion batteries, enhancing production efficiency and safety while maintaining high energy output.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- NORTHVOLT AB
- Filing Date
- 2022-02-04
- Publication Date
- 2026-06-16
AI Technical Summary
The production of rechargeable lithium-ion batteries is hindered by complex vent mechanisms and the need for multiple components, which increases production time and cost while compromising safety and energy output.
A cylindrical secondary battery design featuring a conductive sheet with a protruding portion without electrode coating, a conductive plate with a rivet head forming part or all of the terminal, and a venting mechanism integrated into the rivet head, allowing for a direct current path and reduced component count.
This design reduces production time and cost, enhances energy output, and ensures safe operation by integrating a venting mechanism without additional components, providing a quick and reliable assembly method.
Smart Images
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Abstract
Description
Technical Field
[0001] The present disclosure relates to cylindrical secondary batteries and methods for assembling them.
Background Art
[0002] The transition from fossil fuels to renewable energy is gaining significant momentum. One of the most important factors is the development of better and cheaper rechargeable batteries. Currently, lithium-ion batteries are becoming increasingly popular. They represent a type of rechargeable battery in which lithium ions move from the negative electrode to the positive electrode during discharge and move in the reverse direction during charging.
[0003] As the demand for rechargeable batteries increases, the production speed is increasingly attracting attention so that production companies can meet the demand. To achieve effective production of rechargeable batteries, the steps of the manufacturing process can be optimized.
[0004] Another aspect to consider is that the use of rechargeable batteries must be safe. Therefore, rechargeable batteries have at least one vent for releasing gas when the pressure inside the battery rises above an acceptable level. Vents are often complex mechanisms.
[0005] A rechargeable battery, or in other words a secondary battery, comprises one or more secondary cells.
Summary of the Invention
[0006] In view of the above, an object of the present disclosure is to provide an improved cylindrical secondary battery for rechargeable batteries.
[0007] This object is achieved by devices and methods as defined in the appended claims.
[0008] The present disclosure provides a cylindrical secondary battery, the cylindrical secondary battery comprising -A cylindrical can having a first can end, - Terminals and, -A first conductive sheet having a first electrode coating, wound to form a jelly roll placed inside a can, wherein the first conductive sheet includes a portion without the first electrode coating that protrudes above the first end of the jelly roll. - An electrode that is conductive, positioned on the first end side of the jelly roll, and in direct contact with at least a portion of the portion of the first conductive sheet that lacks the first electrode coating. Lead Board and It is equipped with.
[0009] electrode Lead The plate has a projection that extends through an opening in the can. The opening is located in the first can end side. The projection has a rivet head located on the outside of the can, and the rivet head forms at least a portion of the terminal.
[0010] This results in the electrode acting as a current collector for the portion without the first electrode coating. Lead The plate forms a single piece with at least a portion of the terminals. This means that the number of components in the cylindrical secondary battery can be reduced, which reduces both cost and production time. Also, the current from the portion without the first electrode coating has a direct, uninterrupted path to the terminals. This can increase the energy output of the secondary battery.
[0011] In some embodiments, the rivet head forms the entire terminal. This allows for a further reduction in the number of parts by forming the entire terminal of the secondary battery on the rivet head.
[0012] According to some embodiments, the diameter of the rivet head is greater than the diameter of the can opening, and the area of the rivet head is less than 50% of the total area of the first can end side. The diameter is greater than the opening so that the rivet head cannot enter the opening and fasten there. Also, the diameter of the rivet head is greater than the opening so that it seals the opening. The area of the rivet head is less than 50% of the total area of the first can end side so that the area of the first can end side is sufficiently large for external loads, such as a busbar used to connect secondary batteries.
[0013] According to some embodiments, a cylindrical secondary battery comprises an insulating layer placed between the can and the terminals so that the can is insulated from the terminals. Depending on the design of the can, this may be necessary to ensure that current from the terminals does not pass through the can.
[0014] According to some embodiments, the cylindrical secondary battery has an insulating layer and a sealing portion which are electrodes. Lead The plate and the can are insulated together, and the can and the electrode are insulated. Lead It includes a sealing portion positioned between the plate and the other. Depending on the design of the can, this may be an electrode. Lead This may be necessary to ensure that the current from the plate does not pass through the can.
[0015] According to some embodiments, a cylindrical secondary battery comprises a second conductive sheet having a second electrode coating and a separator sheet. The first conductive sheet, the separator sheet, and the second conductive sheet are wound together to form a jelly roll. This forms a tabless cylindrical secondary battery. In contrast, in many solutions, tabs are connected to the jelly roll and welded to the underside of the cap.
[0016] In some embodiments, the rivet head is equipped with a venting mechanism. By adding a venting function to the rivet head, the number of components required for a secondary battery is further reduced.
[0017] According to some embodiments, the venting mechanism includes a thin-walled portion of a material in the rivet head that is configured to rupture when the internal pressure in the can exceeds a predetermined level.
[0018] According to some embodiments, the venting mechanism includes at least one notch in the rivet head configured to rupture when the internal pressure in the can exceeds a predetermined level.
[0019] Therefore, there are several ways to achieve a venting mechanism within the rivet head.
[0020] This disclosure provides a method for assembling a cylindrical secondary battery. The jelly roll of the cylindrical secondary battery has a hollow cylindrical shape such that there is a hole between the first end of the jelly roll and the second end of the jelly roll. Electrode Lead The protruding part of the plate is an electrode. Lead It is positioned in the center of the board. Assembling a cylindrical secondary battery is - The electrode extends through the opening inside the can. Lead Arranging the boards, -At least a portion of the portion of the first conductive sheet that does not have the first electrode coating is an electrode Lead The jelly rolls are placed inside the can so that they are in direct contact with the board, - Inserting at least a portion of the mandrel into the hole of the jelly roll from the second end side of the jelly roll, and the mandrel having a mandrel end, - The protruding portion is deformed between the mandrel end and the pressing portion, and as a result, the pressing mechanism is pressed onto the protruding portion from the side opposite to the side into which the mandrel is inserted, so as to form a rivet head. It is equipped with.
[0021] In this assembly method, holes passing through the jelly roll are used to access the electrodes from the inside of the secondary battery using a mandrel. LeadIt is used for riveting the protruding part of the plate. This is a quick and reliable method for forming at least a part of the terminal from the rivet head. It also does not require any complex tools.
[0022] According to some embodiments, the electrode Lead The protruding part of the plate comprises a hollow cylindrical protrusion that is closed at the end and should extend through the opening in the can before assembling the cylindrical secondary battery. The mandrel has a diameter that fits into the hollow cylindrical protrusion. Inserting at least a part of the mandrel from the second end side of the jelly roll into the hole of the jelly roll comprises inserting the mandrel into the hollow cylindrical protrusion until it is inserted by a predetermined length leaving a gap between the mandrel end and the closed end of the hollow cylindrical protrusion. This is for the electrode Lead In the case where the protruding part of the plate is hollow. This is optional and is in the case where there is a venting mechanism on the rivet head.
[0023] According to some embodiments, the mandrel has a ledge arranged at a predetermined distance from the mandrel end such that when the mandrel is inserted into the hole of the jelly roll, the mandrel ledge abuts against the electrode Lead plate when the mandrel is inserted into the hollow cylindrical protrusion by a predetermined length, thereby preventing further insertion of the mandrel. By having the ledge at a predetermined distance, the mandrel is prevented from being inserted excessively into the hollow cylindrical protrusion of the electrode Lead plate. This can also be done in other ways, for example, using a control system for moving the mandrel. Either can of course also be used.
[0024] The present disclosure provides a cylindrical secondary battery, which comprises - a cylindrical can having a first can end side, - a terminal, -A first conductive sheet having a first electrode coating, wound to form a jelly roll placed inside a can, wherein the first conductive sheet includes a portion without the first electrode coating that protrudes above the first end of the jelly roll. - An electrode that is conductive, positioned on the first end side of the jelly roll, and in direct contact with at least a portion of the portion of the first conductive sheet that lacks the first electrode coating. Lead Board and It is equipped with electrodes. Lead The plate has a hollow projection that protrudes through an opening inside the can, such that a portion of the projection is exposed to the outside of the can. The portion of the projection exposed to the outside of the can may be equipped with a venting mechanism.
[0025] This results in the electrode acting as a current collector for the portion without the first electrode coating. Lead The plate forms a single piece with the venting mechanism. This means that the number of parts in the cylindrical secondary battery can be reduced, which reduces both cost and production time.
[0026] In some embodiments, a portion of the protrusion exposed on the outside of the can comprises at least a portion of the terminal. By adding terminal functionality to a portion of the protrusion exposed on the outside of the can, the number of components required for the secondary battery is further reduced. In addition, the current from the portion without the first electrode coating has a direct, uninterrupted path to the terminal. This can increase the energy output of the secondary battery.
[0027] According to some embodiments, the venting mechanism comprises a thin-walled section of material configured to rupture when the internal pressure inside the can exceeds a predetermined level.
[0028] According to some embodiments, the venting mechanism comprises at least one notch configured to rupture when the internal pressure inside the can exceeds a predetermined level.
[0029] Therefore, there are several ways to achieve a venting mechanism in a portion of the protrusion exposed on the outside of the can.
[0030] According to some embodiments, a cylindrical secondary battery comprises a second conductive sheet having a second electrode coating and a separator sheet. The first conductive sheet, the separator sheet, and the second conductive sheet are wound together to form a jelly roll. Thus, a tablet cylindrical secondary battery is formed.
[0031] This disclosure provides a method for assembling a cylindrical secondary battery. The jelly roll of the cylindrical secondary battery has a hollow cylindrical shape such that there is a hole between the first end of the jelly roll and the second end of the jelly roll. Electrode Lead The protruding part of the plate is an electrode. Lead It has a hollow cylindrical projection positioned in the center of the plate, which extends through the opening in the can before assembling the cylindrical secondary battery, and is closed at the end. The end has a venting mechanism. Assembling the cylindrical secondary battery is - The electrode extends through the opening inside the can. Lead Arranging the boards, -At least a portion of the portion of the first conductive sheet that does not have the first electrode coating is an electrode Lead The jelly rolls are placed inside the can so that they are in direct contact with the board, - Inserting at least a portion of the mandrel into the hole of the jelly roll from the second end side of the jelly roll, the mandrel having a diameter such that it fits into the hollow cylindrical projection and has a mandrel end, and the mandrel is inserted into the hollow cylindrical projection by a predetermined length, leaving a gap between the mandrel end and the closed end of the hollow cylindrical projection. - The hollow cylindrical projection is deformed between the mandrel end and the pressing portion, and as a result, the pressing mechanism is pressed onto the closed end of the hollow cylindrical projection from the side opposite to the side into which the mandrel is inserted, so as to form a rivet head. It is equipped with.
[0032] In this assembly method, holes passing through the jelly roll are used to access the electrodes from the inside of the secondary battery using a mandrel. Lead It is used to rivet protrusions on plates. This is a quick and reliable method for forming rivet heads with a bent mechanism. It also requires no complex tools.
[0033] According to some embodiments, when the mandrel is inserted into the hole of the jelly roll, the mandrel ledge becomes an electrode when the mandrel is inserted into the hollow cylindrical projection by a predetermined length. Lead It includes a ledge positioned at a predetermined distance from the mandrel end so as to abut the plate and thereby prevent further insertion of the mandrel.
[0034] By having a ledge at a predetermined distance, the mandrel is an electrode. Lead This prevents excessive insertion into the hollow cylindrical projection of the plate. This can also be done in other ways, for example, by using a control system for moving the mandrel. Both cans can, of course, be used.
[0035] Here, different embodiments are described as examples with reference to the attached drawings. [Brief explanation of the drawing]
[0036] [Figure 1] This is a cross-sectional view of an example cylindrical secondary battery where the rivet head forms part of the terminal. [Figure 2] An example of Figure 1 without a cross-sectional view is shown. [Figure 3] An example from Figure 1 is shown from the side. [Figure 4] An enlarged view of the example in Figure 1 is shown. [Figure 5] This diagram shows a cross-sectional view of a typical cylindrical secondary battery where the rivet head forms the entire terminal. [Figure 6] An example of Figure 5 without a cross-sectional view is shown. [Figure 7] An example from Figure 5 is shown from the side. [Figure 8a] Examples of different possible venting mechanisms as viewed from above are shown. [Figure 8b] Examples of different possible venting mechanisms as viewed from above are shown. [Figure 8c] Examples of different possible venting mechanisms as viewed from above are shown. [Figure 8d] Examples of different possible venting mechanisms as viewed from above are shown. [Figure 8e] Examples of different possible venting mechanisms as viewed from above are shown. [Figure 8f] Examples of different possible venting mechanisms as viewed from above are shown. [Figure 9a] This example shows the steps of how a mandrel is used to form a rivet head. [Figure 9b] This example shows the steps of how a mandrel is used to form a rivet head. [Figure 9c] This example shows the steps of how a mandrel is used to form a rivet head. [Modes for carrying out the invention]
[0037] This disclosure is not limited to the embodiments disclosed and may be modified and amended within the scope of the claims.
[0038] Herein, aspects of the present disclosure will be described with reference to the accompanying drawings. The devices and methods disclosed herein can, however, be implemented in many different forms and should not be construed as being limited to the forms described herein.
[0039] The technical terms used herein are intended solely to describe specific aspects of the present application and are not intended to limit the invention. The singular forms "a," "an," and "the" are intended to include the plural form unless otherwise specified by the context.
[0040] The term "terminal" refers to a part of a secondary battery that is to be connected to an external load.
[0041] Alternative terms for the term "can" are "case" and "housing case."
[0042] Alternative terms for "conductive sheet" are "conductive substrate" and "current collector."
[0043] Figures 1-4 show examples of cylindrical secondary batteries 1 in which the rivet head 6b forms part of the terminal 3. Figures 5-7 show examples of cylindrical secondary batteries 1 in which the rivet head 6b forms the entire terminal 3.
[0044] This disclosure provides a cylindrical secondary battery 1 comprising a cylindrical can 2 having a first can end side 2a. The cylindrical can 2 thus forms the housing of the cylindrical secondary battery 1. The cylindrical secondary battery 1 comprises terminals 3 and a first conductive sheet 4 having a first electrode coating, wound to form a jelly roll 5 disposed in the can 2. The first conductive sheet 4 has a portion 4a without the first electrode coating that protrudes onto the first end side 5a of the jelly roll 5. In other words, the first conductive sheet 4 has a portion without the first electrode coating, and when wound onto the jelly roll 5, the portion without the first electrode coating is positioned on the first end side 5a of the jelly roll 5. Thus, the first conductive sheet 4 is exposed on the first end side of the jelly roll 5.
[0045] In some embodiments, a cylindrical secondary battery may comprise a first conductive sheet 4, a second conductive sheet 9 having a second electrode coating, and a separator sheet 10. The first conductive sheet 4, the separator sheet 10, and the second conductive sheet are then wound to form a jelly roll 5. In this example, the cylindrical secondary battery 1 forms a tablet battery. Alternatively, there may be two separator sheets 10 such that the first conductive sheet 4, the first separator sheet 10, the second conductive sheet 9, and the second separator sheet 10 are wound to form a jelly roll 5. For example, if a solid electrolyte is used in the cylindrical secondary battery 1, there may be no separator sheet.
[0046] The cylindrical secondary battery 1 is conductive and has electrodes positioned on the first end side 5a of the jelly roll 5 that are in direct contact with at least a portion of the portion 4a of the first conductive sheet 4 that lacks the first electrode coating. Lead It includes a plate 6. Electrode Lead Plate 6 is for collecting current from the portion 4a of the first conductive sheet 4 that does not have the first electrode coating. Lead The plate 6 comprises any of aluminum, stainless steel, aluminum alloys, and any combination thereof, composed of at least one of copper (Cu), manganese (Mn), silicon (Si), magnesium (Mg), and zinc (Zn). Electrode Lead The plate has a thickness of, for example, 0.1 mm to 2.0 mm, preferably 0.3 mm to 1 mm.
[0047] electrode Lead The plate 6 has a projection 6a that extends through the opening 2c in the can 2. The opening 2c is located in the first can end side 2a. The area of the opening 2c is, for example, 0.4% to 10% of the area of the first can end side 2a. The area of the opening 2c is, for example, 0.5% to 5% of the area of the first can end side 2a. The projection 6a has a rivet head 6b located on the outside of the can 2, and the rivet head 6b forms at least a part of the terminal 3. This makes the electrode, which is the current collector of the portion 4a without the first electrode coating, an electrode. LeadThe plate 6 forms a single piece with at least a portion of the terminal 3. This means that the number of parts in the cylindrical secondary battery 1 can be reduced, which reduces both cost and production time. Also, the current from the portion 4a without the first electrode coating has a direct, uninterrupted path to the terminal 3. This can increase the energy output of the secondary battery 1. Electrode Lead The protruding portion 6a of the plate 6 is an electrode Lead The plate 6 may have a different thickness from the rest of the plate.
[0048] When the rivet head 6b forms at least a portion of the terminal 3, the portion of the terminal without the rivet head is cut out so that the upper part of the rivet head 6b is at the same height as the upper surface of the terminal 3. This is shown in Figures 1, 3, 4 and 9a-c.
[0049] As an alternative, electrodes Lead Plate 6 has a hollow projection 6a that protrudes through an opening 2c in can 2 such that a portion of the projection 6a is exposed to the outside of can 2. The portion of the projection 6a exposed to the outside of can 2 is equipped with a vent mechanism 11. This provides an electrode that is a current collector for the portion 4a without the first electrode coating. Lead The plate 6 forms a single piece with the venting mechanism 11. This means that the number of parts in the cylindrical secondary battery 1 can be reduced, which reduces both cost and production time.
[0050] The cylindrical secondary battery 1 of the present disclosure is compatible with a cylindrical secondary battery comprising a cylindrical can 2 having a first can end side 2a, terminals 3, and a first conductive sheet 4 having a first electrode coating wound to form a jelly roll 5 disposed inside the can 2, wherein the first conductive sheet 4 has a portion 4a without the first electrode coating that protrudes onto the first end side 5a of the jelly roll 5, and an electrode that is conductive, disposed on the first end side 5a of the jelly roll 5, and in direct contact with at least a portion of the portion 4a without the first electrode coating of the first conductive sheet 4. LeadIt comprises a plate 6. Regarding other parts of the cylindrical secondary battery 1, such as the second can end side 2b, there are many methods for designing them that are known to those skilled in the art and are not presented here. Note that the second can end side 2b is not shown in the figure.
[0051] electrode Lead The plate 6 naturally forms at least a portion of the terminal 3 and may also be equipped with the venting mechanism 11. Therefore, if the rivet head 6b forms at least a portion of the terminal 3, the rivet head 6b may also be equipped with the venting mechanism 11. Adding a venting function to the rivet head 6b further reduces the number of components required for the secondary battery 1. In this case, the projection 6a equipped with the rivet head 6b is hollow so that gas can access the vent in the rivet head 6b.
[0052] If a portion of the protrusion 6a exposed on the outside of the can 2 is equipped with a venting mechanism 11, then a portion of the protrusion 6a exposed on the outside of the can 2 may be equipped with at least a portion of a terminal 3. By adding the function of a terminal 3 to a portion of the protrusion 6a, the number of components required for the secondary battery 1 is further reduced. In addition, the current from the portion 4a without the first electrode coating has a direct, uninterrupted path to the terminal 3. This can increase the energy output of the secondary battery 1.
[0053] In all exemplary embodiments, the vent mechanism 11 or pressure relief structure can be implemented in several ways. Preferably, the vent mechanism 11 can be formed as a non-re-closing pressure relief structure having a weakened portion or rupture indicator designed to cease functioning at a predetermined differential pressure. According to some embodiments, the vent mechanism 11 comprises a thin-walled portion 11a of material configured to rupture when the internal pressure in the can 2 exceeds a predetermined level. According to some embodiments, the vent mechanism 11 comprises at least one notch 11b configured to rupture when the internal pressure in the can 2 exceeds a predetermined level. Thus, there are several ways to achieve the vent mechanism 11 in the can 2 and in a portion of the protrusion 6a exposed to the outside of the rivet head 6b. Figure 8a shows an exemplary cylindrical secondary battery 1 from above, in which the rivet head 6b comprises a vent mechanism 11 in the form of a thin-walled portion 11a of material. Figures 8b-8f show examples from above in which the rivet head 6b comprises a vent mechanism 11 in the form of a notch 11b. The figure shows different examples of patterns for the notch 11b. The depth of the notch is determined according to the desired burst pressure. The desired burst pressure depends on the material used in the secondary battery.
[0054] As can be seen in Figures 8b to 8f, Figure 8b shows a cross-shaped cut, Figure 8c shows a linear cut, Figure 8d shows a circular cut, Figure 8e shows a horseshoe-shaped cut, and Figure 8d shows a cut with two semicircular shapes.
[0055] In some embodiments, the rivet head 6b forms the entire terminal 3. This allows for a further reduction in the number of parts by having the rivet head 6b form the entire terminal 3 of the secondary battery 1. Again, Figures 5-7 show different diagrams of an exemplary cylindrical secondary battery 1 in which the rivet head 6b forms the entire terminal 3.
[0056] Whether the rivet head 6b forms part of the terminal 3 or the entire terminal 3, the diameter of the rivet head is greater than the diameter of the can opening, and the area of the rivet head is less than 50% of the total area of the first can end. The diameter is greater than the opening so that the rivet head cannot enter the opening. In other words, the rivet head 6b is larger than the opening 2c in the can 2. Also, the total area of the upper surface of the rivet head 6b is less than 50% of the total area of the first can end 2a.
[0057] According to some embodiments, the cylindrical secondary battery 1 includes an insulating layer 7 placed between the can 2 and the terminals 3 so that the can 2 is insulated from the terminals 3. Depending on the design of the can 2, this may be necessary to ensure that current from the terminals 3 does not pass through the can 2.
[0058] The insulating layer 7 comprises, for example, any of the following, and any combination thereof: glass fiber reinforced polycarbonate (PC+GF), polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), polyphenylene ether (PPE), and polyethylene terephthalate (PET).
[0059] According to some embodiments, the cylindrical secondary battery 1 has an insulating layer 7 and a sealing portion 8 which are electrodes. Lead The plate and the can 2 are insulated together, and the can 2 and the electrode are insulated. Lead It includes a sealing portion 8 positioned between the plate and the can 2. Depending on the design of the can 2, this is an electrode Lead This may be necessary to ensure that the current from the board does not pass through can 2.
[0060] The sealing portion 8 is, for example, a gasket made of a resin such as polypropylene (PP), polybutylene terephthalate (PBT), perfluoroalkoxyalkane (PFA), polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), or a combination thereof, or an O-ring made of rubber such as styrene-butadiene rubber (SBR), ethylene propylene diene monomer rubber (EPDM), silicone elastomer, fluorocarbon rubber (FKM), or a combination thereof.
[0061] Depending on the design of the sealing portion 8, the electrodes Lead It should be noted that an internal insulator may be required between the plate 6 and the can 2. An example of such an internal insulator is shown in Figures 1, 3, 4, 5, 7, and 9a-9c in the form of a plate with openings for the sealing portion 8 and the protrusion 6a. The material of such an internal insulator may be any or any combination of polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), polyphenylene ether (PPE), polycarbonate (PC), and polyethylene terephthalate (PET).
[0062] Figures 9a-9c show example steps of how the mandrel 12 is used to form the rivet head 6b. In the illustrated example, the projection 6a is hollow, but the same method can be used for projections with a solid structure. For the method described below, the jelly roll 5 of the cylindrical secondary battery 1 has a hollow cylindrical shape with a hole between the first end side 5a of the jelly roll 5 and the second end side of the jelly roll 5. Also, electrodes Lead The protruding portion 6a of the plate is an electrode. Lead It is positioned in the center of the board.
[0063] If there is no vent in the rivet head 6b, the present disclosure provides a method for assembling a cylindrical secondary battery 1, the method is - The electrode extends through the opening 2c in the can 2, so that the protrusion 6a extends through the opening 2c in the can 2. LeadArranging the boards, -At least a portion of the portion 4a of the first conductive sheet 4 that does not have the first electrode coating is an electrode Lead Place the jelly roll 5 inside can 2 so that it is in direct contact with the board, - Inserting at least a portion of the mandrel 12 into the hole of the jelly roll 5 from the second end side of the jelly roll 5, and the mandrel 12 having a mandrel end 12a, - The protruding portion 6a is deformed between the mandrel end 12a and the pressing portion, and as a result, the pressing mechanism 13 is pressed onto the protruding portion 6a from the side opposite to the side into which the mandrel 12 is inserted, so that the rivet head 6b is formed. It is equipped with.
[0064] Figure 9a illustrates the case where the mandrel 12 is placed in the jelly roll 5 and the pressing mechanism 13 is on top of the cylindrical battery 1. In Figure 9b, the mandrel 12 and the pressing mechanism 13 are pressed together to form the rivet head 6b. In Figure 9c, it can be seen that the rivet head 6b fills the notch of the terminal, so that the top of the rivet head 6b is at the same height as the top surface of the terminal.
[0065] In addition to the opening 2c, the first can end side 2a can be closed, and therefore electrodes can enter from the opposite end of the can 2, i.e., the second can end side 2b. Lead By inserting the plate, the electrode extends so that the protrusion 6a extends through the opening 2c in the can 2. Lead Note that plates may be placed. If the first can end side 2a is not attached to the rest of can 2 before assembly, electrodes LeadThe plate may be positioned such that the projection 6a extends through the opening 2c of the can 2 before the first can end side 2a is placed in the rest of the can 2. The same applies to the jelly roll 5, which is inserted from the second can end side 2b if the first can end is closed except for the hole. If the jelly roll 5 is not attached to the rest of the can 2 before assembly, it may also be placed in the can 2 before the first can end side 2a is placed in the rest of the can 2. In this case, the jelly roll 5 is placed in the electrode Lead The plate may be placed inside can 2 before it is placed inside can 2. Also, in such a case, the electrodes Lead The plate may be placed on the portion 4a of the first conductive sheet 4 that does not have the first electrode coating, before the first can end side 2a is placed on the rest of the can 2.
[0066] In this assembly method, the holes passing through the jelly roll 5 are used to access the electrodes from the inside of the secondary battery 1 using the mandrel 12. Lead It is used to rivet the protruding portion 6a of the plate. This is a quick and reliable method for forming the rivet head 6b, and thus at least a portion of the terminal 3. It also requires no complex tools.
[0067] When the protruding portion 6a is hollow, the electrode Lead The plate projection 6a comprises a hollow cylindrical projection 6a that is closed at the end and extends through the opening 2c in the can 2 before assembling the cylindrical secondary battery 1. The mandrel 12 then has a diameter that fits into the hollow cylindrical projection 6a. Inserting at least a portion of the mandrel 12 into the hole of the jelly roll 5 from the second end side of the jelly roll 5 comprises inserting the mandrel 12 into the hollow cylindrical projection 6a by a predetermined length, leaving a gap between the mandrel end 12a and the closed end of the hollow cylindrical projection 6a. This is the electrode Lead This is for cases where the protruding portion 6a of the plate is hollow. This is optional, but it is for cases where there is a venting mechanism 11 on the rivet head 6b.
[0068] According to some embodiments, when the mandrel 12 is inserted into the hole of the jelly roll 5, the mandrel ledge 12b becomes an electrode when the mandrel 12 is inserted into the hollow cylindrical projection 6a by a predetermined length. Lead The mandrel 12 is provided with a ledge 12b positioned at a predetermined distance from the mandrel end 12a so as to contact the plate and thereby prevent further insertion of the mandrel 12. By having the ledge at a predetermined distance, the mandrel 12 is positioned so as to be an electrode. Lead This prevents the plate from being excessively inserted into the hollow cylindrical projection 6a. This can also be done in other ways, for example, by using a control system for moving the mandrel 12. Both cans can, of course, be used.
[0069] The ledge also has the function of pressing the sealing portion 8 discussed above. Pressing the sealing portion 8 improves the sealing function of the sealing portion 8.
[0070] When the end of the protrusion 6a is equipped with a venting mechanism 11, the assembly method is the same as when the protrusion 6a is hollow: The jelly roll 5 of the cylindrical secondary battery 1 has a hollow cylindrical shape with a hole between the first end 5a of the jelly roll 5 and the second end of the jelly roll 5. Electrode Lead The protruding portion 6a of the plate is an electrode. Lead It is provided with a hollow cylindrical projection 6a that is located in the center of the plate and extends through the opening 2c in the can 2 before assembling the cylindrical secondary battery 1, and is closed at the end. The end is provided with a venting mechanism 11. Assembling the cylindrical secondary battery 1 is - The electrode extends through the opening 2c in the can 2, so that the protrusion 6a extends through the opening 2c in the can 2. Lead Arranging the boards, -At least a portion of the portion 4a of the first conductive sheet 4 that does not have the first electrode coating is an electrode Lead Place the jelly roll 5 inside can 2 so that it is in direct contact with the board, - Inserting at least a portion of the mandrel 12 into the hole of the jelly roll 5 from the second end side of the jelly roll 5, the mandrel 12 having a diameter such that it fits into the hollow cylindrical projection 6a and has a mandrel end 12a, and the mandrel 12 is inserted into the hollow cylindrical projection 6a by a predetermined length, leaving a gap between the mandrel end 12a and the closed end of the hollow cylindrical projection 6a. The hollow cylindrical projection 6a is deformed between the mandrel end 12a and the pressing portion, and as a result, the pressing mechanism 13 is pressed onto the closed end of the hollow cylindrical projection 6a from the side opposite to the side into which the mandrel 12 is inserted, so as to form the rivet head 6b. It is equipped with.
[0071] In this assembly method, the holes passing through the jelly roll 5 are used to access the electrodes from the inside of the secondary battery 1 using the mandrel 12. Lead It is used to rivet the protruding portion 6a of the plate. This is a quick and reliable method for forming a rivet head 6b with a bent mechanism 11. It also does not require any complex tools.
[0072] According to some embodiments, when the mandrel 12 is inserted into the hole of the jelly roll 5, the mandrel ledge 12b becomes an electrode when the mandrel 12 is inserted into the hollow cylindrical projection 6a by a predetermined length. Lead The structure includes a ledge 12b positioned at a predetermined distance from the mandrel end 12a so as to contact the plate and thereby prevent further insertion of the mandrel 12.
[0073] By having a ledge at a predetermined distance, the mandrel 12 is an electrode. Lead This prevents the plate from being excessively inserted into the hollow cylindrical projection 6a. This can also be done in other ways, for example, by using a control system for moving the mandrel 12. Both cans can, of course, be used.
[0074] [Reference List] 1. Cylindrical rechargeable battery 2. Cylindrical can a. First can end side b. The second end of the can (not shown in the diagram) c.Opening 3. Terminals 4. First conductive sheet a. Area without the first electrode coating 5. Jelly Roll a. First end side 6. Electrode Lead board a.Protrusion b. Rivet head 7. Insulating layer 8. Sealing section 9. Second conductive sheet 10. Separator sheet 11. Vent mechanism a. Thin-walled section b. Cut 12. Mandrel a. End b.ledge 13. Pressing mechanism The following is a direct reproduction of the claims as originally filed. [C1] A cylindrical secondary battery (1), -A cylindrical can (2) having a first can end side (2a), - Terminal (3), -A first conductive sheet (4) having a first electrode coating is wound to form a jelly roll (5) placed inside the can (2), wherein the first conductive sheet (4) has a portion (4a) without the first electrode coating that protrudes onto the first end side (5a) of the jelly roll (5), - An electrode that is conductive, positioned on the first end side (5a) of the jelly roll (5), and in direct contact with at least a portion of the portion (4a) of the first conductive sheet (4) that lacks the first electrode coating. Lead plate (6) and The electrode Lead plate(6) comprises a projection (6a) extending through an opening (2c) in the can (2), the opening (2c) being located in the first can end side (2a), the projection (6a) comprising a rivet head (6b) located on the outside of the can (2), and the rivet head (6b) forming at least a part of the terminal (3), characterized in that a cylindrical secondary battery (1). [C2] The rivet head (6b) forms the entire terminal (3) of the cylindrical secondary battery (1) as described in C1. [C3] The cylindrical secondary battery (1) according to C1 or C2, wherein the diameter of the rivet head (6b) is greater than the diameter of the opening (2c) of the can (2), and the area of the rivet head (6b) is less than 50% of the total area of the first can end side (2a). [C4] - An insulating layer (7) is placed between the can (2) and the terminal (3) so that the can (2) is insulated from the terminal (3). A cylindrical secondary battery (1) as described in any one of C1 to C3, comprising the following: [C5] - The insulating layer (7) and the sealing portion (8) are the electrodes Lead plate The can (2) and the electrode are insulated from each other. Lead plate The sealing portion (8) is positioned between the two. A cylindrical secondary battery (1) as described in C4, comprising the above. [C6] - A second conductive sheet (9) having a second electrode coating, - Separator sheet (10) and A cylindrical secondary battery (1) according to any one of C1 to C5, comprising the first conductive sheet (4), the separator sheet (10), and the second conductive sheet being wound to form the jelly roll (5). [C7] The rivet head (6b) is a cylindrical secondary battery (1) according to any one of C1 to C6, which is equipped with a venting mechanism (11). [C8] The cylindrical secondary battery (1) according to C7, wherein the venting mechanism (11) comprises a thin-walled portion (11a) of a material configured to rupture when the internal pressure in the can (2) exceeds a predetermined level, within the rivet head (6b). [C9] The cylindrical secondary battery (1) according to C7, wherein the venting mechanism (11) comprises at least one notch (11b) in the rivet head (6b) configured to rupture when the internal pressure in the can (2) exceeds a predetermined level. [C10] A method for assembling the cylindrical secondary battery (1) described in any one of C1 to C5, wherein the jelly roll (5) of the cylindrical secondary battery (1) has a hollow cylindrical shape such that there is a hole between the first end side (5a) of the jelly roll (5) and the second end side of the jelly roll (5), and the electrodes Lead plate The aforementioned protrusion (6a) is the electrode On the lead plate It is positioned in the center, and assembling the cylindrical secondary battery (1) is - The electrode extends through the opening (2c) in the can (2) such that the protrusion (6a) extends through the opening (2c) in the can (2) Lead plate To arrange, -At least a portion of the portion (4a) of the first conductive sheet (4) that does not have the first electrode coating is the electrode Lead plate The jelly roll (5) is placed inside the can (2) so as to be in direct contact with it, - Inserting at least a portion of the mandrel (12) into the hole of the jelly roll (5) from the second end side of the jelly roll (5), and the mandrel (12) having a mandrel end (12a), - The protruding portion (6a) is deformed between the mandrel end (12a) and the pressing portion, and as a result, the pressing mechanism (13) is pressed onto the protruding portion (6a) from the side opposite to the side into which the mandrel (12) is inserted, so as to form the rivet head (6b). A method that includes [a certain feature]. [C11] The electrode Lead plateThe method according to any one of C10 and C6-8, wherein the projection (6a) comprises a hollow cylindrical projection (6a) that is closed at an end and extends through the opening (2c) in the can (2) before assembling the cylindrical secondary battery (1), the mandrel (12) has a diameter such that it fits into the hollow cylindrical projection (6a), and inserting at least a portion of the mandrel (12) into the hole of the jelly roll (5) from the second end side of the jelly roll (5) comprises inserting the mandrel (12) until it is inserted into the hollow cylindrical projection (6a) by a predetermined length, leaving a gap between the mandrel end (12a) and the closed end of the hollow cylindrical projection (6a). [C12] When the mandrel (12) is inserted into the hole of the jelly roll (5), the mandrel ledge (12b) is inserted into the hollow cylindrical projection (6a) by the predetermined length, and the electrode Lead plate The method according to C10 or 11, comprising a ledge (12b) positioned at a predetermined distance from the mandrel end (12a) so as to abut against the mandrel (12) and thereby prevent further insertion of the mandrel (12). [C13] A cylindrical secondary battery (1), -A cylindrical can (2) having a first can end side (2a), - Terminal (3), -A first conductive sheet (4) having a first electrode coating is wound to form a jelly roll (5) placed inside the can (2), wherein the first conductive sheet (4) has a portion (4a) without the first electrode coating that protrudes onto the first end side (5a) of the jelly roll (5), - An electrode that is conductive, positioned on the first end side (5a) of the jelly roll (5), and in direct contact with at least a portion of the portion of the first conductive sheet (4) that lacks the first electrode coating. Lead plate (6) and The electrode Lead plate(6) is a cylindrical secondary battery (1) comprising a hollow projection (6a) that protrudes through an opening (2c) in the can (2) such that a part of the projection (6a) is exposed to the outside of the can (2), and the part of the projection (6a) exposed to the outside of the can (2) is provided with a vent mechanism (11). [C14] A cylindrical secondary battery (1) according to C13, wherein a portion of the protrusion (6a) exposed on the outside of the can (2) comprises at least a portion of the terminal (3). [C15] The cylindrical secondary battery (1) according to C13 or 14, wherein the venting mechanism (11) comprises a thin-walled portion (11a) of a material configured to rupture when the internal pressure in the can (2) exceeds a predetermined level. [C16] The cylindrical secondary battery (1) according to C13 or 14, wherein the venting mechanism (11) comprises at least one notch (11b) configured to rupture when the internal pressure in the can (2) exceeds a predetermined level. [C17] - A second conductive sheet (9) having a second electrode coating, - Separator sheet (10) and A cylindrical secondary battery (1) according to any one of C13 to C16, comprising the first conductive sheet (4), the separator sheet (10), and the second conductive sheet (9) being wound to form the jelly roll (5). [C18] A method for assembling the cylindrical secondary battery (1) described in any one of C13 to C17, wherein the jelly roll (5) of the cylindrical secondary battery (1) has a hollow cylindrical shape such that there is a hole between the first end side (5a) of the jelly roll (5) and the second end side of the jelly roll (5), and the electrodes Lead plate The aforementioned protrusion (6a) is the electrode On the lead plateIt is provided with a hollow cylindrical projection (6a) that is closed at the end and is located in the center and extends through the opening (2c) in the can (2) before the cylindrical secondary battery (1) is assembled, the end side is provided with the vent mechanism (11), and the assembly of the cylindrical secondary battery (1) is - The electrode extends through the opening (2c) in the can (2) such that the protrusion (6a) extends through the opening (2c) in the can (2) Lead plate To arrange, -At least a portion of the portion (4a) of the first conductive sheet (4) that does not have the first electrode coating is the electrode Lead plate The jelly roll (5) is placed inside the can (2) so as to be in direct contact with it, - Inserting at least a portion of the mandrel (12) into the hole of the jelly roll (5) from the second end side of the jelly roll (5), the mandrel (12) having a diameter such that it fits into the hollow cylindrical projection (6a) and has a mandrel end (12a), and the mandrel (12) is inserted into the hollow cylindrical projection (6a) by a predetermined length, leaving a gap between the mandrel end (12a) and the closed end of the hollow cylindrical projection (6a), The hollow cylindrical projection (6a) is deformed between the mandrel end (12a) and the pressing portion, and as a result, the pressing mechanism (13) is pressed onto the closed end of the hollow cylindrical projection (6a) from the side opposite to the side into which the mandrel (12) is inserted, so as to form the rivet head (6b). A method that includes [a certain feature]. [C19] When the mandrel (12) is inserted into the hole of the jelly roll (5), the mandrel ledge (12b) is inserted into the hollow cylindrical projection (6a) by the predetermined length, and the electrode Lead plate The method according to C18, comprising a ledge (12b) positioned at a predetermined distance from the mandrel end (12a) so as to abut against the mandrel (12) and thereby prevent further insertion of the mandrel (12).
Claims
1. A cylindrical secondary battery, - A cylindrical can having a first can end, - Terminal and, - A first conductive sheet having a first electrode coating, wound to form a jelly roll disposed in the cylindrical can, wherein the first conductive sheet includes a portion without the first electrode coating that protrudes above the first end of the jelly roll. - An electrode lead plate that is conductive, positioned on the first end side of the jelly roll, and in direct contact with at least a portion of the portion of the first conductive sheet that lacks the first electrode coating. A cylindrical secondary battery comprising, wherein the electrode lead plate has a projection extending through an opening in the cylindrical can, the opening is located in the first can end side, the projection has a rivet head located on the outside of the cylindrical can, and the rivet head forms part of the terminal.
2. The cylindrical secondary battery according to claim 1, wherein the diameter of the rivet head is larger than the diameter of the opening of the cylindrical can, and the area of the rivet head is less than 50% of the total area on the first can end side.
3. - An insulating layer is placed between the cylindrical can and the terminal so that the cylindrical can is insulated from the terminal. A cylindrical secondary battery according to claim 1, comprising the following:
4. - The sealing portion is positioned between the cylindrical can and the electrode lead plate so that the insulating layer and the sealing portion insulate both the electrode lead plate and the cylindrical can. A cylindrical secondary battery according to claim 3, comprising the following:
5. - A second conductive sheet having a second electrode coating, - Separator sheet and The cylindrical secondary battery according to claim 1, comprising the first conductive sheet, the separator sheet, and the second conductive sheet being wound to form the jelly roll.
6. The cylindrical secondary battery according to claim 1, wherein the rivet head is equipped with a venting mechanism.
7. The cylindrical secondary battery according to claim 6, wherein the venting mechanism includes a thin-walled portion of a material configured to rupture when the internal pressure in the cylindrical can exceeds a predetermined level within the rivet head.
8. The cylindrical secondary battery according to claim 6, wherein the venting mechanism comprises at least one notch in the rivet head configured to rupture when the internal pressure in the cylindrical can exceeds a predetermined level.
9. A method for assembling the cylindrical secondary battery according to claim 1, wherein the jelly roll of the cylindrical secondary battery has a hollow cylindrical shape such that there is a hole between the first end of the jelly roll and the second end of the jelly roll, the protrusion of the electrode lead plate is positioned at the center on the electrode lead plate, and assembling the cylindrical secondary battery is - The electrode lead plate is positioned such that the protruding portion extends through the opening in the cylindrical can, - Arrange the jelly roll in the cylindrical can such that at least a portion of the first conductive sheet without the first electrode coating is in direct contact with the electrode lead plate, - Inserting at least a portion of the mandrel into the hole of the jelly roll from the second end side of the jelly roll, and the mandrel having a mandrel end, - The protruding portion is deformed between the mandrel end and the pressing portion, and thereby the pressing mechanism is pressed onto the protruding portion from the side opposite to the side into which the mandrel is inserted, so as to form the rivet head. A method that includes [a certain feature].
10. The method according to claim 9, wherein the projection of the electrode lead plate has a hollow cylindrical projection that is closed at the end and extends through the opening in the cylindrical can before assembling the cylindrical secondary battery, the mandrel has a diameter such that it fits into the hollow cylindrical projection, and inserting at least a portion of the mandrel into the hole of the jelly roll from the second end side of the jelly roll comprises inserting the mandrel until it is inserted into the hollow cylindrical projection by a predetermined length, leaving a gap between the end of the mandrel and the closed end of the hollow cylindrical projection.
11. The method according to claim 9, wherein the mandrel comprises a ledge positioned at a predetermined distance from the mandrel end such that when the mandrel is inserted into the hole of the jelly roll, the mandrel ledge contacts the electrode lead plate when the mandrel has been inserted into the hollow cylindrical projection by a predetermined length, thereby preventing the mandrel from being inserted any further.
12. A cylindrical secondary battery, - A cylindrical can having a first can end, - Terminal and, - A first conductive sheet having a first electrode coating, wound to form a jelly roll disposed in the cylindrical can, wherein the first conductive sheet includes a portion without the first electrode coating that protrudes above the first end of the jelly roll. - An electrode lead plate that is conductive, positioned on the first end side of the jelly roll, and in direct contact with at least a portion of the portion of the first conductive sheet that lacks the first electrode coating. A cylindrical secondary battery comprising, wherein the electrode lead plate has a hollow protrusion that protrudes through an opening in the cylindrical can such that a portion of the protrusion is exposed to the outside of the cylindrical can, and the portion of the protrusion exposed to the outside of the cylindrical can is provided with a venting mechanism.
13. The cylindrical secondary battery according to claim 12, wherein a portion of the protrusion exposed on the outside of the cylindrical can comprises a portion of the terminal.
14. The cylindrical secondary battery according to claim 12, wherein the venting mechanism comprises a thin-walled portion of a material configured to rupture when the internal pressure in the cylindrical can exceeds a predetermined level.
15. The cylindrical secondary battery according to claim 12, wherein the venting mechanism comprises at least one notch configured to rupture when the internal pressure in the cylindrical can exceeds a predetermined level.
16. - A second conductive sheet having a second electrode coating, - Separator sheet and The cylindrical secondary battery according to claim 12, comprising the first conductive sheet, the separator sheet, and the second conductive sheet being wound to form the jelly roll.
17. A method for assembling the cylindrical secondary battery according to claim 12, wherein the jelly roll of the cylindrical secondary battery has a hollow cylindrical shape such that there is a hole between the first end side of the jelly roll and the second end side of the jelly roll, the projection of the electrode lead plate is located in the center of the electrode lead plate and has a hollow cylindrical projection that is closed at the end side and extends through the opening in the cylindrical can before assembling the cylindrical secondary battery, the end side has the vent mechanism, and assembling the cylindrical secondary battery is - The electrode lead plate is positioned such that the protruding portion extends through the opening in the cylindrical can, - Arrange the jelly roll in the cylindrical can such that at least a portion of the first conductive sheet without the first electrode coating is in direct contact with the electrode lead plate, - Inserting at least a portion of the mandrel into the hole of the jelly roll from the second end side of the jelly roll, the mandrel having a diameter such that it fits into the hollow cylindrical projection and has a mandrel end, and the mandrel is inserted into the hollow cylindrical projection by a predetermined length, leaving a gap between the mandrel end and the closed end of the hollow cylindrical projection. The hollow cylindrical projection is deformed between the mandrel end and the pressing portion, and as a result, the pressing mechanism is pressed onto the closed end of the hollow cylindrical projection from the side opposite to the side into which the mandrel is inserted, so as to form a rivet head. A method that includes [a certain feature].
18. The method according to claim 17, wherein the mandrel comprises a ledge positioned at a predetermined distance from the mandrel end such that when the mandrel is inserted into the hole of the jelly roll, the mandrel ledge contacts the electrode lead plate when the mandrel has been inserted into the hollow cylindrical projection by a predetermined length, thereby preventing the mandrel from being inserted any further.