CN-122003764-A - Battery module and battery pack including the same

Abstract

A battery module according to an embodiment of the present invention includes a battery cell stack having a plurality of battery cells laminated therein, a module case having the battery cell stack received therein and having an opening formed on one surface thereof, and a battery cell diagnosis assembly mounted on the module case to be located in the opening, wherein the battery cell diagnosis assembly may be coupled to the module case such that at least a portion of the battery cell diagnosis assembly may be movable.

Inventors

• GONG CHENGZHEN

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260508

Application Date

20250723

Priority Date

20240902

Claims (20)

1. 1. A battery module, the battery module comprising: A battery cell laminate having a plurality of battery cells laminated therein; A module case in which the battery cell stack is accommodated and an opening is formed on one surface, and A battery cell diagnosis assembly mounted on the module case so as to be located in the opening portion, Wherein the battery cell diagnostic assembly is coupled to the module housing such that at least a portion of the battery cell diagnostic assembly is movable.
2. 2. The battery module according to claim 1, Wherein the battery cell diagnostic assembly is coupled to the module housing in a manner that is movable in at least one direction.
3. 3. The battery module according to claim 2, Wherein the cell diagnosis assembly is coupled to the module case so as to be movable in at least one of a width direction of the opening portion and a height direction of the module case, and The opening portion has a width in the same direction as that in which expansion occurs in the battery cell.
4. 4. The battery module according to claim 2, Wherein the cell diagnosis assembly is movably coupled with the module case at a portion adjacent to one side edge of the opening in the width direction of the opening, and is fixedly coupled with the module case at a portion adjacent to the other side edge of the opening in the width direction of the opening.
5. 5. The battery module according to claim 2, Wherein the module case includes a first coupling hole formed in a portion adjacent to one side edge of the opening portion in the width direction of the opening portion and a second coupling hole formed in a portion adjacent to the other side edge of the opening portion in the width direction of the opening portion, The cell diagnosis assembly includes first and second coupling parts coupled with the first and second coupling holes, respectively, and The first coupling hole is in the form of a slot.
6. 6. The battery module according to claim 5, Wherein the first coupling hole and the second coupling hole are located in a central region of the module case in a length direction thereof on one surface of the module case where the opening is formed.
7. 7. The battery module according to claim 5, Wherein the first coupling portion is coupled to the first coupling hole in a movable manner along an extending direction of the first coupling hole, and The second coupling portion is fixedly coupled to the second coupling hole.
8. 8. The battery module according to claim 7, Wherein the first coupling hole is formed to extend in the width direction, and The second coupling part is fixedly coupled to the second coupling hole by a heat fusing method.
9. 9. The battery module according to claim 5, Wherein the first coupling portion includes: a first body part having a cylindrical shape, which extends in a height direction of the battery cell diagnosis assembly and is inserted into the first coupling hole, and A first head portion formed at an upper portion of the first body portion to be in contact with the first body portion, Wherein the first coupling hole has an extension length longer than a diameter of the first body portion.
10. 10. The battery module according to claim 1, Wherein, the cell diagnosis assembly includes: A printed circuit board; A lower case on which the printed circuit board is mounted, and An upper cover configured to cover at least a portion of the printed circuit board.
11. 11. The battery module according to claim 10, Wherein the lower housing is coupled to at least one of the module housing and the upper cover by a snap fit.
12. 12. The battery module according to claim 10, Wherein the lower housing includes a hooking member that is hooked with at least one of the module housing and the upper cover.
13. 13. The battery module according to claim 12, Wherein the upper cover is coupled to the lower housing in a spaced apart manner from the hooking member.
14. 14. The battery module according to claim 13, Wherein the upper cover is coupled to the lower case such that a surface facing the printed circuit board is spaced apart from an uppermost end of the hooking member.
15. 15. The battery module according to claim 12, Wherein the plurality of hook members are provided, and the plurality of hook members are provided along the periphery of the lower case.
16. 16. The battery module according to claim 15, Wherein a part of the plurality of the hook members is formed on both sides in the length direction of the lower case, and Other portions of the plurality of hook members are formed on both sides in the width direction of the lower case.
17. 17. The battery module according to claim 10, Wherein the printed circuit board is configured to diagnose at least one of a voltage and a temperature of the battery cells.
18. 18. The battery module according to claim 3, Wherein the plurality of battery cells are stacked in the width direction.
19. 19. The battery module according to claim 1, Wherein the module case is formed with vent holes through which gas and flame generated inside the battery module are discharged.
20. 20. A battery pack, the battery pack comprising: The battery module according to any one of claims 1 to 19, and And a battery pack case in which the battery module is enclosed.

Description

Battery module and battery pack including the same Technical Field Cross Reference to Related Applications The present application claims priority and benefit from korean patent application No. 10-2024-018820, filed on month 2 of 2024, and korean patent application No. 10-2025-0090055, filed on month 7 of 2025, the disclosures of which are incorporated herein by reference in their entireties. The present disclosure relates to a battery module and a battery pack including the same, and more particularly, to a battery module and a battery pack including the same that minimize deformation of a battery cell diagnosis assembly. Background In modern society, since portable devices such as mobile phones, notebook computers, camcorders and digital cameras, and Energy Storage Systems (ESS) have been used daily, development of technologies in the fields related thereto has been activated. In addition, the chargeable/dischargeable secondary battery is used as a power source for Electric Vehicles (EVs), hybrid Electric Vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), etc., in an attempt to solve air pollution, etc., caused by existing gasoline vehicles using fossil fuel. Accordingly, the demand for development of secondary batteries is increasing. The secondary batteries commercialized at present include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, lithium secondary batteries, and the like. Among these batteries, lithium secondary batteries have been attracting attention because of their advantages of free charge and discharge, very low self-discharge rate, and high energy density. Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as a positive electrode active material and a negative electrode active material, respectively. A lithium secondary battery includes an electrode assembly in which a separator is disposed between positive and negative electrode plates coated with positive and negative electrode active materials, and a case, i.e., a battery case, which seals and accommodates the electrode assembly and an electrolyte. Generally, lithium secondary batteries can be classified into can-type secondary batteries, in which an electrode assembly is contained in a metal can, and pouch-type secondary batteries, in which an electrode assembly is contained in a pouch made of an aluminum laminate sheet, depending on the shape of a case. In the case of a secondary battery for a small-sized device, two to three battery cells are provided, but in the case of a secondary battery for a middle-and large-sized device, a battery module or a battery pack in which a plurality of battery cells are electrically connected is used. In such a battery module, a plurality of battery cells are connected in series or parallel with each other to form a unit assembly, thereby improving capacity and output. One or more battery modules may be mounted together with various control and protection systems such as a BMS (battery management system), a BDU (battery disconnect unit), and a cooling system to form a battery pack. The battery pack may include a battery module as its subordinate concept, and the battery module may include a battery cell as its subordinate concept. Further, the number of battery cells included in the battery module or the number of battery modules included in the battery pack may be variously determined according to the output or capacity of the battery pack required for the electric vehicle or the Energy Storage System (ESS). Meanwhile, as the secondary battery is repeatedly charged and discharged, a swelling phenomenon of the battery cells may occur. The swelling phenomenon is a phenomenon in which the volume of an active material coated on the positive and negative electrodes increases to swell the battery cells upon repeated charge and discharge. Swelling initially occurs in each battery cell contained in the battery module and ultimately affects the entire battery module. The battery module may include a plurality of battery cells, a module frame housing the battery cells, a battery cell diagnostic assembly mounted on the module frame, and the like. The module frame and the battery cell diagnostic assembly mounted on the module frame may deform together when expansion occurs in the battery cells housed in the module frame. There is a problem in that the battery cell diagnosis assembly is deformed and damaged due to the expansion of the battery cell such that the printed circuit board included in the battery cell diagnosis assembly cannot perform its original functions (e.g., diagnosing the voltage and temperature of the battery cell). Accordingly, there is a need for a structure that can minimize deformation of a cell diagnostic assembly mounted to a module case even if an expansion phenomenon occurs in a battery cell and the module case is deformed. Disclosure of Invention Technical problem It is an object of the present disclosure to provid