EP-4742340-A1 - BATTERY AND BATTERY PACK INCLUDING THE SAME

EP4742340A1EP 4742340 A1EP4742340 A1EP 4742340A1EP-4742340-A1

Abstract

A battery includes a case (100), an electrode assembly (200) inside the case, the electrode assembly including electrodes parallel to each other in a first direction, a tab (301) member including electrode tabs extending from the electrodes in a one-to-one manner, the electrode tabs including first electrode tabs, a cap assembly facing the electrode assembly, the cap assembly including a terminal (420), and a current collector assembly (500) between the electrode assembly and the cap assembly, the current collector assembly including a current collector (510) connected to the terminal and a current collector plate (520) connected to the tab member, and the current collector plate including a slit (S11,S12) through which the first electrode tabs pass.

Inventors

JUNG, YEON HO
LIM, HYUN YOUNG

Assignees

SAMSUNG SDI CO., LTD.

Dates

Publication Date: 20260513
Application Date: 20250828

Claims (15)

A battery, comprising: a case; an electrode assembly inside the case, the electrode assembly including electrodes parallel to each other in a first direction; a tab member including electrode tabs extending from the electrodes in a one-to-one manner, the electrode tabs including first electrode tabs; a cap assembly facing the electrode assembly, the cap assembly including a terminal; and a current collector assembly between the electrode assembly and the cap assembly, the current collector assembly including a current collector connected to the terminal and a current collector plate connected to the tab member, and the current collector plate including a slit through which the first electrode tabs pass.
The battery of claim 1, wherein the first electrode tabs pass through the slit and are joined to one surface of the current collector plate.
The battery of claim 2, wherein the electrode tabs further include second electrode tabs that do not pass through the slit, the second electrode tabs being joined to another surface of the current collector plate.
The battery of claim 2 or claim 3, wherein the slit extends in a second direction intersecting the first direction.
The battery of claim 4, wherein the first electrode tabs pass through the slit and are joined to the one surface of the current collector plate at opposite sides of the slit in the first direction.
The battery of claim 5, wherein the slit is located at a center of the current collector plate in the first direction.
The battery of any one of claims 4 to 6, wherein a width (W) of the slit satisfies Equation 1, t × n ≤ W ≤ t × n + 2.0 mm , wherein t represents a thickness of one of the first electrode tabs and n represents a number of the first electrode tabs.
A battery, comprising: a case; an electrode assembly inside the case, the electrode assembly including positive electrodes and negative electrodes alternating in a first direction; a positive electrode tab member including positive electrode tabs extending from the positive electrodes in a one-to-one manner; a negative electrode tab member spaced apart from the positive electrode tab member in a second direction intersecting the first direction, the negative electrode tab member including negative electrode tabs extending from the negative electrodes in a one-to-one manner; a cap assembly facing the electrode assembly, the cap assembly including a positive electrode terminal and a negative electrode terminal; a positive electrode current collector assembly between the electrode assembly and the cap assembly, the positive electrode current collector assembly including a positive electrode current collector connected to the positive electrode terminal and a positive electrode current collector plate connected to the positive electrode tab member, and the positive electrode current collector plate including a first slit through which first positive electrode tabs, which are portions of the positive electrode tabs, pass; and a negative electrode current collector assembly between the electrode assembly and the cap assembly, the negative electrode current collector assembly including a negative electrode current collector connected to the negative electrode terminal and a negative electrode current collector plate connected to the negative electrode tab member, and the negative electrode current collector plate including a second slit through which first negative electrode tabs, which are portions of the negative electrode tabs, pass.
The battery of claim 8, wherein: the first positive electrode tabs pass through the first slit and are joined to one surface of the positive electrode current collector plate, the first negative electrode tabs pass through the second slit and are joined to one surface of the negative electrode current collector plate, second positive electrode tabs, which are remaining electrode tabs that do not pass through the first slit among the positive electrode tabs, are joined to another surface of the positive electrode current collector plate, and second negative electrode tabs, which are remaining electrode tabs that do not pass through the second slit among the negative electrode tabs, are joined to another surface of the negative electrode current collector plate.
The battery of claim 9, wherein each of the first slit and the second slit extends in the second direction.
The battery of claim 10, wherein: the first positive electrode tabs pass through the first slit and are joined to the one surface of the positive electrode current collector plate at opposite sides of the first slit in the first direction, and the first negative electrode tabs pass through the second slit and are joined to the one surface of the negative electrode current collector plate at opposite sides of the second slit in the first direction.
The battery of claim 11, wherein: the first slit is located at a center of the positive electrode current collector plate in the first direction, and the second slit is located at a center of the negative electrode current collector plate in the first direction.
The battery of claim 11 or claim 12, wherein: a width (W1) of the first slit satisfies Equation 2, a width (W2) of the second slit satisfies Equation 3, t 1 × n 1 ≤ W 1 ≤ t 1 × n 1 + 1.2 to 2.0 mm , t 2 × n 2 ≤ W 2 ≤ t 2 × n 2 + 1.2 to 2.0 mm , t1 represents a thickness of one of the first positive electrode tabs, n1 represents a number of the first positive electrode tabs, t2 represents a thickness of one of the first negative electrode tabs, and n2 represents a number of the first negative electrode tabs.
The battery of claim 13, wherein the width of the first slit is equal to or greater than the width of the second slit.
A battery pack, comprising: a housing; and a plurality of batteries inside the housing, each of the batteries being in accordance with any one of the preceding claims.

Description

BACKGROUND 1. Field The present disclosure relates to a battery and a battery pack including the same. 2. Description of the Related Art Unlike a primary battery that cannot be recharged, a secondary battery is a battery that can be recharged and discharged. A low-capacity secondary battery may be used for portable small-sized electronic devices, such as smartphones, feature phones, notebook computers, digital cameras, and camcorders, and a high-capacity secondary battery is widely used as a power source for driving a motor and a power storage battery in hybrid vehicles or electric vehicles. Such a secondary battery may include electrodes having a positive electrode and/or a negative electrode, an electrode assembly having the electrodes, a case that accommodates the electrode assembly, electrode terminals connected to the electrode assembly, and the like. As technology advances, secondary batteries with high capacity are required. Accordingly, a plurality of secondary batteries may be electrically connected and used. For example, the secondary battery may be applied to an electronic device in the form of a battery module including a plurality of secondary batteries, and/or a battery pack including a plurality of secondary battery modules. According to an embodiment, the secondary battery pack is also configured by a plurality of secondary batteries. In this case, the electronic device is an electronic device that requires high power and/or high capacity and includes, for example, an electric vehicle or the like. A secondary battery may include an electrode assembly in which a positive electrode, a separator, and a negative electrode are alternately arranged. The electrode assembly may be accommodated inside a case. A plurality of positive and negative electrodes (hereinafter referred to as "electrodes") constituting the electrode assembly may be electrically connected to the outside through positive and negative electrode tabs (hereinafter referred to as "electrode tabs"), respectively. That is, a plurality of positive electrode tabs and a plurality of negative electrode tabs may be electrically connected to a positive electrode terminal and a negative electrode terminal (hereinafter referred to as "electrode terminals"), which are installed on a cap plate, respectively. To establish an electrical connection between the plurality of electrode tabs and the electrode terminal, a connection assembly including one or more connection members may be disposed between the plurality of electrode tabs and the electrode terminal. The connection assembly may electrically connect the plurality of electrode tabs to the electrode terminal by joining one portion thereof to the plurality of electrode tabs and another portion thereof to the electrode terminal. In the connection assembly, the connection member joined to the plurality of electrode tabs and the connection member joined to the electrode terminal may be different parts of a single structure or separate structures that are coupled together. Such a connection assembly can be referred to as a current collector assembly that performs the function of gathering current supplied from the plurality of electrode tabs and transmitting the current to the electrode terminal. The shape and configuration of the current collector assembly can be implemented in various ways depending on the type, internal structure, specifications, and the like of a secondary battery. The above-described information disclosed in the background technology of the present disclosure is merely intended to improve understanding of the background of the present disclosure and thus may include information that does not form the related art. SUMMARY According to an aspect of the present disclosure, there is provided a battery including a case, an electrode assembly disposed inside the case and including a plurality of electrodes disposed parallel to each other in a first direction, a tab member including a plurality of electrode tabs extending from the plurality of electrodes in a one-to-one manner, a cap assembly disposed to face the electrode assembly and including a terminal, and a current collector assembly disposed between the electrode assembly and the cap assembly, and including a current collector connected to the terminal and a current collector plate connected to the tab member, wherein the current collector plate includes a slit through which first electrode tabs, which are portions of the plurality of electrode tabs, pass. According to an aspect of the embodiment, the first electrode tabs may pass through the slit and may be joined to one surface of the current collector plate. In addition, second electrode tabs, which are the remaining electrode tabs that do not pass through the slit among the plurality of electrode tabs, may be joined to the other surface of the current collector plate. In addition, the slit may be formed in a second direction intersecting the first direction. In addition