KR-102962331-B1 - Energy storage cell

KR102962331B1KR 102962331 B1KR102962331 B1KR 102962331B1KR-102962331-B1

Abstract

An energy storage cell (100) comprises an electrode-separator assembly (104) having a sequence of anode/separator/cathode. The electrode-separator assembly (104) is in the form of a hollow cylindrical roll having two terminal end faces and a wound outer edge between them. The energy storage cell comprises a housing, which surrounds a hollow cylindrical internal space. Within the internal space of the housing, the electrode-separator assembly (104) is formed as an axially aligned roll. To define the internal space, the housing comprises a first ring-shaped end member (1010) having an outer diameter and an inner diameter, a second ring-shaped end member (1020) having an outer diameter and an inner diameter, and a first tubular housing part (1030) having two terminal circular openings, wherein the diameter of the first tubular housing part (1030) is matched to the outer diameter of the first ring-shaped end member (1010) and the second ring-shaped end member (1020), and a second tubular housing part (1040) having two terminal circular openings, wherein the diameter of the second tubular housing part (1040) is matched to the outer diameter of the first ring-shaped end member (1010) and the second ring-shaped end member (1020). Contact of the ribbon-shaped electrodes of the electrode-separator assembly is made through the longitudinal edges of the electrodes protruding from the terminal end surfaces of the hollow cylindrical roll. The energy storage cell has a contact member that is at least partially metal and preferably welded to one of the longitudinal edges in direct contact with the longitudinal edge. First and second annular end members (1010, 1020) function as the contact member. The second tubular housing portion (1040) of the housing forms a channel (1500) that is open on both sides and extends axially through the energy storage cell.

Inventors

피틀릭, 에드워드
엔슬링, 데이비드

Assignees

바르타 마이크로바테리 게엠베하

Dates

Publication Date: 20260508
Application Date: 20210914
Priority Date: 20200922

Claims (15)

An energy storage cell (100) designed as a cylindrical cell having an outer diameter of at least 30 mm, having the following features a. An energy storage cell has an electrode-separator assembly (104) having a sequence of anode/separator/cathode, and b. The electrode-separator assembly (104) is in the form of a hollow cylindrical winding having two terminal end faces and a winding shell between them, and c. The energy storage cell is equipped with a housing, and d. This housing surrounds a hollow cylindrical internal space, and e. Within this internal space of the housing, an electrode-separator assembly (104) formed as a roll is aligned axially, and f. To partition the internal space, the housing - A first ring-shaped finishing member (1010) having an outer diameter and an inner diameter, and - A second ring-shaped finishing member (1020) having an outer diameter and an inner diameter, and - A first tubular housing part (1030) having two terminal circular openings, wherein the diameter of the first tubular housing part (1030) is matched to the outer diameter of the first ring-shaped end member (1010) and the second ring-shaped end member (1020), and - A second tubular housing part (1040) having two terminal circular openings, wherein the diameter of the second tubular housing part (1040) is matched to the inner diameter of the first ring-shaped end member (1010) and the second ring-shaped end member (1020), and g. The anode of the electrode-separator assembly is ribbon-shaped and has a ribbon-shaped anode current collector (115) having a first longitudinal edge (115a) and a second longitudinal edge, and h. The anode current collector (115) comprises a strip-shaped main region on which a layer of cathode material (155) is supported, and a free edge strip (117) that extends along a first longitudinal edge (115a) without the electrode material (155) being covered. i. The cathode of the electrode-separator assembly is ribbon-shaped and has a ribbon-shaped cathode current collector (125) having a first longitudinal edge (125a) and a second longitudinal edge, and j. A cathode current collector (125) comprises a strip-shaped main region on which a layer of a positive electrode material (123) is supported, and a free edge strip (121) that extends along a first longitudinal edge (125a) without the electrode material (123) being covered. k. An anode and a cathode are formed and/or arranged relative to each other within an electrode-separator assembly (104) such that a first longitudinal edge (115a) of the anode current collector (115) protrudes from one of the terminal end faces and a first longitudinal edge (125a) of the cathode current collector (125) protrudes from the other of the terminal end faces, l. An energy storage cell has a contact member that is at least partially metal and is welded to one of the first longitudinal edges (115a, 125a) in direct contact with the longitudinal edge. Having features, and the following additional features m. The first or second ring-shaped end members (1010, 1020) function as contact members, and n. The second tubular housing portion (1040) has features such that both sides are open and form a channel (1500) that extends axially through an energy storage cell, The above contact member further performs the function of transmitting current, and The first or second ring-shaped end member occupies at least 70% of the end surface, and An energy storage cell in which the contact member has a thickness of 150 μm to 350 μm.
In paragraph 1, The following additional features: a. A channel (1500) with both ends open is set up for temperature control of an energy storage cell. Energy storage cell having specific features.
In paragraph 1, The following additional features: a. A channel (1500) with both ends open is provided for the flow of a temperature-controlled medium, gas, or liquid. Energy storage cell having specific features.
In paragraph 1, The following additional features: a. A metal rod or tube is inserted into a channel (1500) that is open at both ends as a temperature control medium. Energy storage cell having specific features.
In paragraph 1, The following additional features: a. The energy storage cell (100) is a cylindrical cell Energy storage cell having specific features.
In paragraph 1, The following additional features: a. A cylindrical energy storage cell (100) having an outer diameter of at least 32 mm Energy storage cell having specific features.
In paragraph 1, The following additional features: a. The energy storage cell (100) is a lithium-ion battery Energy storage cell having specific features.
The apparatus comprises at least two energy storage cells (100) according to any one of claims 1 to 7, and means for temperature-controlling the energy storage cells through channels (1500) of the energy storage cells that are open on both sides. A battery in which each of the above at least two energy storage cells (100) includes a first or second ring-shaped closing member (1010, 1020) that performs the function of collecting and transmitting current.
In paragraph 8, The following additional features: a. Energy storage cells (100) of a battery are interconnected and arranged within battery modules (500) that form a battery. A battery with specific features.
In paragraph 8, The following additional features: A temperature control device for energy storage cells has means for introducing a temperature control medium into channels (1500) that are open on both sides of the energy storage cells. A battery with specific features.
In paragraph 8, The following additional features: a. A temperature control device for energy storage cells is equipped with a gas temperature control medium and a means for driving air flow, and b. A temperature control device for energy storage cells is provided with means for inducing a gas temperature control medium and air flow to pass through a channel (1500) that is open on both sides of the energy storage cells. A battery having at least one of the features.
In paragraph 8, The following additional features: a. A temperature control device of an energy storage cell is equipped with a pumping means for transporting a liquid temperature control medium, and b. A temperature control device for an energy storage cell has means for guiding a liquid temperature control medium into channels (1500) that are open on both sides of the energy storage cells. A battery having at least one of the features.
In paragraph 8, The following additional features: a. A metal rod or tube is inserted as a temperature control medium into channels (1500) with both sides of the energy storage cells open, and b. A metal rod or tube joined to a cooling and/or heating medium A battery having the following features.
A method for manufacturing an energy storage cell according to any one of claims 1 to 7, Next steps: a. A step of providing an electrode-separator assembly (104) in the form of a hollow cylindrical roll having at least an anode/separator/cathode sequence and two terminal end faces and a roll outer edge between them, wherein the electrodes each include a current collector (115, 125) having a first longitudinal edge (115a, 125a) and a second longitudinal edge, wherein one of the longitudinal edges (115a, 125a) protrudes from one of the terminal end faces and the other of the longitudinal edges protrudes from the other of the terminal end faces; and b. Components of the housing, i.e. - A first ring-shaped finishing member (1010) having an outer diameter and an inner diameter, and - A second ring-shaped finishing member (1020) having an outer diameter and an inner diameter, and - A first tubular housing part (1030) having two terminal circular openings, wherein the diameter of the first tubular housing part (1030) is matched to the outer diameter of the first ring-shaped end member (1010) and the second ring-shaped end member (1020), and - A second tubular housing part (1040) having two terminal circular openings, wherein the diameter of the second tubular housing part (1040) is matched to the inner diameter of the first ring-shaped end member (1010) and the second ring-shaped end member (1020), the second tubular housing part (1040). The steps provided, and c. A step of placing the electrode-separator assembly (104) inside the housing and assembling the housing, and d. A step of electrically contacting the electrode-separator assembly with the annular end member of the housing by welding, and e. steps for closing and/or sealing the housing, and At least one of the first or second ring-shaped end members (1010, 1020) performs the function of collecting and transmitting current, and The first or second ring-shaped end member occupies at least 70% of the end surface, and A method for manufacturing an energy storage cell in which the contact member has a thickness of 150 μm to 350 μm.
A method for manufacturing an energy storage cell according to any one of claims 1 to 7, Next steps: a. Components of the housing, i.e. - A first ring-shaped finishing member (1010) having an outer diameter and an inner diameter, and - A second ring-shaped finishing member (1020) having an outer diameter and an inner diameter, and - A first tubular housing part (1030) having two terminal circular openings, wherein the diameter of the first tubular housing part (1030) is matched to the outer diameter of the first ring-shaped end member (1010) and the second ring-shaped end member (1020), and - A second tubular housing part (1040) having two terminal circular openings, wherein the diameter of the second tubular housing part is matched to the inner diameter of the first ring-shaped end member (1010) and the second ring-shaped end member (1020) The steps provided, and b. A step of manufacturing an electrode-separator assembly (104) having a hollow cylindrical roll shape having at least an anode/separator/cathode sequence, two terminal end faces, and a roll outer edge located between them, wherein the electrodes each comprise a current collector (115, 125) having a first longitudinal edge (115a, 125a) and a second longitudinal edge, wherein one of the longitudinal edges (115a, 125a) protrudes from one of the terminal end faces and the other of the longitudinal edges protrudes from the other of the terminal end faces, and - Here, the step of manufacturing the electrode-separator assembly (104), wherein the electrode-separator assembly is formed into a hollow cylindrical roll shape by winding the electrodes and the separator onto a second tubular housing part (1040), and c. Steps for assembling the housing and, d. A step of electrically contacting the electrode-separator assembly with the annular finishing members of the housing by welding, and e. steps for closing and/or sealing the housing, and At least one of the first or second ring-shaped end members above functions to collect and transmit current, and The first or second ring-shaped end member occupies at least 70% of the end surface, and A method for manufacturing an energy storage cell in which the contact member has a thickness of 150 μm to 350 μm.

Description

Energy storage cell The present invention relates to an energy storage cell having an electrode-separator assembly in the form of a hollow cylindrical winding, a battery having a plurality of such energy storage cells, and a method for manufacturing such energy storage cells. Electrochemical cells can convert stored chemical energy into electrical energy through redox reactions. They typically feature a negative electrode and a positive electrode separated by a separator. During discharge, electrons are released from the negative electrode as a result of the oxidation process. This results in a current that can be drawn from an external electrical consumer, where the electrochemical cell functions as an energy supplier. Simultaneously, an ion flow corresponding to the electrode reaction occurs within the cell. These ions penetrate the separator, which is made possible by an ion-transfer electrolyte. If the discharge is reversible—that is, if the conversion of chemical energy into electrical energy occurring during discharge can be reversed so that the battery can be recharged—it is referred to as a secondary battery. Naming the negative electrode as the anode and the positive electrode as the cathode, as is commonly done for secondary batteries, refers to the discharge function of the electrochemical battery. Secondary lithium-ion batteries are used in many applications today because they can provide high current and have a relatively high energy density. They are based on the use of lithium, which can move in the form of ions between electrodes within the battery. The negative and positive electrodes of lithium-ion batteries are generally composed of so-called composite electrodes, which include electrochemically inactive components along with electrochemically active components. In principle, any material capable of absorbing and emitting lithium ions can be used as the electrochemical active component (active material) of secondary lithium-ion batteries. Graphite-based particles, particularly graphitic carbon, are often used for the anode. Other non-graphitic carbon materials capable of lithium intercalating can also be used. Additionally, metallic and semi-metallic materials capable of alloying with lithium can be used. For example, elements such as tin, aluminum, antimony, and silicon can form an intermetallic phase with lithium. For instance, lithium cobalt oxide ( LiCoO2 ), lithium manganese oxide ( LiMn2O4 ), lithium iron phosphate ( LiFePO4 ), or their derivatives can be used as the active material for the cathode. The electrochemical active material is generally incorporated into the electrode in the form of particles. Composite electrodes composed of electrochemically inactive components generally feature flat and/or strip-shaped current collectors, which are typically, for example, metallic foil, and function as carriers for each active material. The current collector of the negative electrode (anode current collector) is composed of, for example, copper or nickel, and the current collector of the positive electrode (cathode current collector) is composed of, for example, aluminum. Additionally, the electrodes may include an electrode binder (such as polyvinylidene fluoride (PVDF) or other polymers such as carboxymethyl cellulose), conductivity-enhancing additives, and other additives composed of electrochemically inactive components. The electrode binder ensures the mechanical stability of the electrode and the attachment of the active material to the current collector. As an electrolyte, lithium-ion batteries generally contain a solution of a lithium salt, such as lithium hexafluorophosphate ( LiPF6 ), in an organic solvent (e.g., ether or ester of carbonate). In the manufacture of lithium-ion batteries, composite electrodes are combined with one or more separators to form an assembly. To this end, the electrodes and separators are generally joined under pressure, if necessary, by stacking and bonding. Then, the basic function of the battery can be established by immersing the assembly in an electrolyte. In many embodiments, the assembly is composed of or manufactured as a winding. Generally, it has a sequence of anode/separator/cathode. The assembly is often composed of a so-called bi-cell having a possible sequence of cathode/separator/anode/separator/cathode or anode/separator/cathode/separator/anode. For applications in the automotive sector and other applications with high energy requirements, such as electric bicycles or tools, the highest possible energy density is required while simultaneously being able to load high currents during discharge and charging. Batteries for the aforementioned applications are often designed as cylindrical round cells with a form factor of, for example, 21 x 79 (diameter x height, mm), and this type of battery always features a roll-shaped assembly. Modern lithium-ion batteries with this form factor have already achieved energy densities of up to 270 Wh/kg.