CN113748564B - Battery module and battery pack including the same - Google Patents

Battery module and battery pack including the same Download PDF

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Publication number
CN113748564B
CN113748564B CN202080031684.5A CN202080031684A CN113748564B CN 113748564 B CN113748564 B CN 113748564B CN 202080031684 A CN202080031684 A CN 202080031684A CN 113748564 B CN113748564 B CN 113748564B
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CN
China
Prior art keywords
battery
module
cell stack
end plate
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202080031684.5A
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Chinese (zh)
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CN113748564A (en
Inventor
崔钟华
成准烨
朴明基
白承律
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LG Energy Solution Ltd
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LG Energy Solution Ltd
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Filing date
Publication date
Application filed by LG Energy Solution Ltd filed Critical LG Energy Solution Ltd
Priority claimed from PCT/KR2020/009089 external-priority patent/WO2021080124A1/en
Publication of CN113748564A publication Critical patent/CN113748564A/en
Application granted granted Critical
Publication of CN113748564B publication Critical patent/CN113748564B/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The battery module according to an embodiment of the present disclosure includes: a cell stack in which a plurality of battery cells are stacked; a module frame accommodating the battery cell stack and having an open top; an upper plate covering the cell stack at the open top of the module frame; a bus bar frame connected to the cell stack; and end plates located at opposite sides of the cell stack, wherein the module frame has a structure for opening the cell stack in a stacking direction of the cells contained in the cell stack, and the end plates cover the stacking surfaces of the cell stack at the open opposite sides of the module frame.

Description

Battery module and battery pack including the same
Technical Field
The present disclosure relates to a battery module and a battery pack including the same, and more particularly, to a battery module having a new structure for preventing swelling of battery cells and a battery pack including the same.
Background
A secondary battery that can be easily applied to various product groups and has electrical characteristics such as high energy density is widely applied not only to portable devices but also to electric vehicles or hybrid electric vehicles driven by an electric drive source, electric storage systems, and the like. Such secondary batteries are attracting attention as novel environmental energy sources for improving energy efficiency because they have a major advantage of significantly reducing fossil fuel use and do not generate byproducts from the energy use at all.
In small-sized mobile devices, one or more battery cells are used per device, whereas in medium-or large-sized devices such as vehicles, high output and large capacity are necessary. Accordingly, a middle-or large-sized battery pack electrically connected using a large number of battery cells.
Preferably, the middle-or large-sized battery module is manufactured to have as small a size and weight as possible. Therefore, a prismatic battery or a pouch-shaped battery, which can be stacked with high integration and has a small weight with respect to capacity, is generally used as the battery cell of the middle-or large-sized battery module. Meanwhile, in order to protect the battery stack from external impact, heat or vibration, the battery module may include a frame member whose front and rear surfaces are open so as to accommodate the battery cell stack in the inner space.
Fig. 1 is a perspective view illustrating a battery module of a unitary frame according to the related art.
Referring to fig. 1, the battery module may include: a cell stack 12 formed by stacking a plurality of cells 11; a unitary frame 20 having front and rear surfaces opened to cover the cell stack 12; and an end plate 60 covering the front and rear surfaces of the integrated frame 20. In order to form such a battery module, horizontal assembly is required such that the battery cell stack 12 is inserted into the open front or rear surface of the integral frame 20 in the X-axis direction shown by the arrow in fig. 1. However, in order to stably perform such horizontal assembly, a sufficient gap must be secured between the cell stack 12 and the integral frame 20. Herein, the void refers to a gap generated by press fitting or the like. When the clearance is small, damage to the components may result during horizontal assembly. Therefore, the height of the integral frame 20 should be designed to be greater in consideration of the maximum height of the battery cell stack 12 and the assembly clearance during insertion. Therefore, unnecessary space waste may occur.
In addition, in order to control the cell swelling, it is necessary to increase the thickness of the frame member, which causes a problem of deterioration in space utilization.
Disclosure of Invention
Technical problem
The present disclosure has been designed to solve the above problems, and an object of the present disclosure is to provide a battery module having a new structure for preventing cell swelling, and a battery pack including the same.
However, the problems to be solved by the embodiments of the present disclosure are not limited to the above-described problems, and various extensions can be made within the scope of the technical ideas included in the present disclosure.
Technical proposal
The battery module according to an embodiment of the present disclosure includes: a battery cell stack in which a plurality of battery cells are stacked, a module frame accommodating the battery cell stack and having an open upper portion, an upper plate covering the battery cell stack at the upper portion of the module frame, a bus bar frame connected to the battery cell stack, and end plates located at both sides of the battery cell stack, wherein the module frame has a structure for opening the battery cell stack in a stacking direction of the battery cells included in the battery cell stack, and wherein the end plates cover stacking surfaces of the battery cell stack at the open both sides of the module frame.
The module frame may include a bottom and two side surface portions facing each other, and the bus bar frame may be located between the side surface portions and the cell stack.
The end plate may be located in a direction perpendicular to a direction in which the electrode leads of the battery cells protrude.
The battery module may further include an insulating plate between the bus bar frame and the side surface portion of the module frame.
First hooks protruding downward may be formed at both sides of the upper plate.
The end plate may have a first stepped portion formed at an upper end portion, and the first hooking portion may be hooked to the first stepped portion.
Second hooks protruding upward are formed at both sides of the bottom of the module frame.
A second stepped portion may be formed at a lower end portion of the end plate, and the second hooking portion may be hooked to the second stepped portion.
The first and second steps may form a groove structure at each of the upper and lower end portions of the end plate.
The end plate may have module mounting portions formed on both outer edges of the first stepped portion.
A first cutout may be formed in the upper plate to correspond to the module mounting part, and the upper end portion of the module mounting part is opened by the first cutout.
A second cutout portion may be formed at a bottom of the module frame to correspond to the module mounting portion, and the lower end portion of the module mounting portion may be opened by the second cutout portion.
The battery module may include a compression pad between the end plate and the cell stack.
The battery module may include an insulating cover between the end plate and the cell stack.
A width of the insulating cover in the Z-axis direction may be greater than a width of the end plate in the Z-axis direction, a first step may be formed between an upper end portion of the insulating cover in the Z-axis direction and an upper end portion of the end plate, and the first hook may be hooked to the first step.
Second hooks protruding upward may be formed at both sides of the bottom of the module frame.
A second stepped portion may be formed between a lower end portion of the insulating cover in the Z-axis direction and a lower end portion of the end plate, and the second hook portion may be hooked to the second stepped portion.
The end plate may be formed of a metal material.
A battery pack according to another embodiment of the present disclosure includes the above-described battery module.
Advantageous effects
According to the embodiment, by implementing the battery module having the new structure, it is possible to improve the space utilization while effectively controlling the cell swelling.
Drawings
Fig. 1 is an exploded perspective view illustrating a battery module having a module frame according to the related art.
Fig. 2 is an exploded perspective view illustrating a battery module according to one embodiment of the present disclosure.
Fig. 3 is a perspective view illustrating a state in which components of the battery module of fig. 2 are coupled.
Fig. 4 is a perspective view illustrating one battery cell included in the battery cell stack of fig. 2.
Fig. 5 is an exploded perspective view of the module frame, upper plate, and end plate in the battery module of fig. 3, as viewed obliquely from the upper side.
Fig. 6 is an exploded perspective view of the module frame and the upper plate in the battery module of fig. 3, as seen obliquely from the lower side.
Fig. 7 is a perspective view illustrating a coupling relationship between an upper plate and an end plate in the battery module of fig. 3.
Fig. 8 is a perspective view illustrating a coupling relationship between a module frame and an end plate in the battery module of fig. 3.
Fig. 9 is an exploded perspective view illustrating a battery module according to another embodiment of the present disclosure.
Fig. 10 is a perspective view illustrating a coupling relationship between an upper plate and an end plate in the battery module of fig. 9.
Fig. 11 is a perspective view illustrating a coupling relationship between a module frame and an end plate in the battery module of fig. 9.
Detailed Description
Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the various embodiments. The present disclosure may be modified in various different ways and is not limited to the embodiments set forth herein.
Portions irrelevant to the specification will be omitted to clearly describe the present disclosure, and like reference numerals denote like elements throughout the specification.
Further, in the drawings, for convenience of description, the sizes and thicknesses of the respective elements are arbitrarily exemplified, and the present disclosure is not necessarily limited to what is illustrated in the drawings. In the drawings, the thickness of layers, regions, etc. are exaggerated for clarity. In the drawings, the thickness of some layers and regions are shown exaggerated for convenience of description.
In addition, it will be understood that when an element such as a layer, film, region or plate is referred to as being "on" or "over" another element, it can be directly on the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on" another element, it means that there are no other intervening elements present. Further, the term "upper" or "above" means disposed on or above the reference portion, and does not necessarily mean disposed on an upper end of the reference portion facing in the opposite direction of gravity.
Furthermore, throughout the specification, when a portion is referred to as "comprising" a certain component, this means that the portion may also include other components without excluding other components, unless otherwise specified.
Further, throughout the specification, when referred to as "plane", this means that the target portion is viewed from the top; and when referred to as a "cross section" this means that the target portion is viewed from one side of the vertically cut cross section.
Fig. 2 is an exploded perspective view illustrating a battery module according to an embodiment of the present disclosure. Fig. 3 is a perspective view illustrating a state in which components of the battery module of fig. 2 are coupled. Fig. 4 is a perspective view illustrating one battery cell included in the battery cell stack of fig. 2. Fig. 5 is an exploded perspective view of the module frame, upper plate, and end plate in the battery module of fig. 3, as viewed obliquely from the upper side. Fig. 6 is an exploded perspective view of the module frame and the upper plate in the battery module of fig. 3, as seen obliquely from the lower side.
Referring to fig. 2 and 3, the battery module 100 according to the present embodiment may include: a cell stack 120 in which a plurality of cells 110 are stacked; a module frame 300 that accommodates the battery cell stack 120; an upper plate 400 covering an open upper portion of the module frame 300; and an end plate 150 covering the front and rear surfaces of the module frame 300. The end plate 150 may be formed of a metal material such as aluminum. The end plate 150 may include a front surface plate covering one side of the module frame 300 and a rear surface plate covering the other side of the module frame 300.
The module frame 300 may be a U-shaped frame, and when the open both sides of the U-shaped frame are referred to as first and second sides, the module frame 300 is constructed in a plate-shaped structure bent to continuously surround the front, lower, and rear surfaces adjacent to each other among the remaining outer surfaces except the surfaces corresponding to the first and second sides of the battery cell stack 120. The upper surface corresponding to the lower surface of the module frame 300 is opened. In the present embodiment, the module frame 300 has a structure in which the cell stack 120 is opened along the stacking direction of the cells 110 included in the cell stack 120. At this time, the end plates 150 cover the stacking surfaces of the cell stacks 120 on the open both sides of the module frame 300.
The battery module 100 according to the present embodiment may further include a bus bar frame 130 between the side surface portion of the module frame 300 and the battery cell stack 120, and may further include an insulating plate 135 between the bus bar frame 130 and the side surface portion of the module frame 300. The insulating plate 135 has a function of allowing the electrode leads 111 and 112 and the bus bar 131 to be insulated from the module frame 300. The insulating plate 135 may be formed of a plastic injection molding material.
Referring to fig. 2, 5 and 6, the module frame 300 according to the present embodiment includes a bottom 300a and two side surface portions 300b facing each other. In addition, the battery module 100 according to the present embodiment further includes a heat conductive resin layer 310 formed by applying a heat conductive resin to the bottom 300a of the module frame 300 and curing the heat conductive resin before the battery cell stack 120 is mounted on the bottom 300a of the module frame 300.
The upper plate 400 according to the present embodiment includes first hooks 400h protruding downward from both sides of the upper plate. Both sides of the upper plate 400, on which the first hooks 400h are formed, correspond to both sides in the X-axis direction, which is the stacking direction of the cell stack 120. The module frame 300 according to the present embodiment further includes second hooks 300c formed on the first side and the second side of the module frame 300, respectively. The second hook 300c may be formed in a structure protruding upward from one end of the bottom 300a of the module frame 300. The first and second sides of the module frame 300 correspond to both sides in the X-axis direction, which is the stacking direction of the battery cell stack 120.
As shown in fig. 6, according to the present embodiment, a first notch portion AP1 is formed in an upper plate 400. The first notch portion AP1 may be formed adjacent to both end portions of the first hook portion 400h, and may be formed at four corners of the upper plate 400. According to the present embodiment, the second notch portion AP2 is formed in the bottom 300a of the module frame 300. The second notch portion AP2 may be formed adjacent to both end portions of the second hook portion 300c, and may be formed at four corners of the bottom 300a of the module frame 300.
The upper plate 400 has a single plate-shaped structure surrounding the remaining upper surfaces except the front, lower and rear surfaces surrounded by the module frame 300. The module frame 300 and the upper plate 400 may be coupled by welding or the like in a state in which the corresponding corner portions are in contact with each other to form a structure surrounding the battery cell stack 120. That is, the module frame 300 and the upper plate 400 may have coupling parts formed at corner parts corresponding to each other by a coupling method such as welding.
The cell stack 120 includes a plurality of cells 110 stacked in one direction, and the plurality of cells 110 may be stacked in the X-axis direction as shown in fig. 2. The battery cell 110 is preferably a pouch-type battery cell. For example, referring to fig. 4, the battery cell 110 according to the present embodiment has a structure in which two electrode leads 111 and 112 face each other and protrude from one end portion 114a and the other end portion 114b of the battery body 113. The battery cell 110 may be manufactured by: in a state in which an electrode assembly (not shown) is received in the battery case 114, both end portions 114a and 114b of the case 114 are engaged with side portions 114c connecting the both end portions. In other words, the battery cell 110 according to the present embodiment has a total of three sealing parts (114 sa, 114sb, 114 sc), wherein the sealing parts 114sa, 114sb, 114sc are formed to be sealed by a method such as thermal fusion, and the remaining other side part may be formed by the connection part 115. Between the two end portions 114a and 114b of the battery case 114 may be defined as a longitudinal direction of the battery cell 110, and between the side portion 114c and the connection portion 115 connecting the two end portions 114a and 114b of the battery case 114 may be defined as a width direction of the battery cell 110.
The connection part 115 is a region extending along one edge of the battery cell 110, and a protrusion 110p of the battery cell 110 may be formed at one end of the connection part 115. The protrusion 110p may be formed on at least one of the two end portions of the connection portion 115, and may protrude in a direction perpendicular to a direction in which the connection portion 115 extends. The protrusion 110p may be located between one of the sealing parts 114sa and 114sb of the both end parts 114a and 114b of the battery case 114 and the connection part 115.
The battery case 114 is generally formed of a stacked structure of a resin layer/a metal thin film layer/a resin layer. For example, in the case where the surface of the battery case is formed of an O (oriented) nylon layer, when a plurality of battery cells are stacked to form a middle-or large-sized battery module, the plurality of battery cells tend to slide while being easily subjected to external impacts. Therefore, in order to prevent these problems and maintain a stable stacked structure of the battery cells, an adhesive member (such as, for example, a tacky adhesive of a double-sided tape) or a chemical adhesive joined by a chemical reaction at the time of joining may be attached to the surface of the battery case to form the battery cell stack 120. In the present embodiment, the battery cell stack 120 may be stacked in the X-axis direction, housed in the module frame 300 in the Z-axis direction, and cooled by a cooling member adjacent to the battery module. In the comparative example thereof, there are cases where: the battery cells are formed as cartridge-type members, and the fixation between the battery cells is performed by assembling the battery module frame. In such a comparative example, since the cartridge-type member is present, the cooling function is difficult to perform or may be performed in the surface direction of the battery cells, but the cooling is not performed well in the height direction of the battery module.
Referring again to fig. 2 and 4, the end plate 150 may be located adjacent to the stacking surface of the battery cell stack in a direction perpendicular to the direction in which the electrode leads 111 and 112 of the battery cell 110 protrude.
Hereinafter, a structure for preventing cell swelling in the battery module according to the present embodiment will be described in detail with reference to fig. 7 and 8.
Fig. 7 is a perspective view illustrating a coupling relationship between an upper plate and an end plate in the battery module of fig. 3. Fig. 8 is a perspective view illustrating a coupling relationship between a module frame and an end plate in the battery module of fig. 3.
Referring to fig. 2, 3 and 7, a first stepped portion 160 is formed on an upper end portion of the end plate 150 included in the battery module according to the present embodiment. The first step 160 may be formed when the end plate 150 is machined and molded. As shown in fig. 7, an upper end portion of the end plate 150 where the first step 160 is formed has a structure slightly protruding in the Z-axis direction. In this case, the first hooking portion 400h of the upper plate 400 may be hooked to the first stepped portion 160. In a state where the first hook portion 400h is hooked to the first step portion 160, the upper plate 400 and the end plate 150 may be coupled to each other by welding.
The end plate 150 according to the present embodiment further includes module mounting parts 152 formed on both outer edges of the first stepped part 160. The module mounting part 152 may be a structure for constructing a battery pack by combining the battery module according to the present embodiment with a battery pack frame (not shown). For example, a mounting member (not shown) is inserted into the module mounting part 152 to connect a battery pack frame (not shown) to the battery module. At this time, the module mounting part 152 may correspond to the first cutout part AP1 of the upper plate 400 described in fig. 6, and an upper end portion of the module mounting part 152 may be opened through the first cutout part AP 1.
Referring to fig. 2, 3 and 8, a second stepped portion 170 is formed at a lower end portion of the end plate 150. The second step 170 may be formed when the end plate 150 is machined and molded. As shown in fig. 8, the lower end portion of the end plate 150 where the second step 170 is formed has a structure slightly protruding in the Z-axis direction. At this time, the second hook 300c of the bottom 300a of the module frame 300 may be hooked to the second step 170. In a state where the second hook portion 300c is hooked to the second stepped portion 170, the bottom 300a of the module frame 300 and the end plate 150 may be coupled to each other by welding.
The module mounting part 152 may correspond to the second cutout part AP2 of the bottom 300a of the module frame 300 described in fig. 6, and a lower end portion of the module mounting part 152 may be opened through the second cutout part AP 2.
According to the battery module structure according to the present embodiment described above, the end plate 150 is formed along the X-axis direction in which the swelling of the battery cells occurs by rotating the position of the module frame by 90 degrees in the conventional U-shaped frame module structure. Thus, the end plate 150 allows for direct control of cell swelling. The end plates 150 and 400 and the end plates 150 and the module frame 300 are fixed by the structures of the hooks 400h and 300c and the steps 160 and 170, and the fixing direction coincides with the X-axis direction in which the cell swelling occurs, thereby effectively controlling the problems caused by the cell swelling. In addition, it is not necessary to increase the thickness of the end plate 150 and the thickness of the bottom surface of the module frame to control the cell swelling, and thus the space utilization can be improved.
The first and second stepped portions 160 and 170 described with reference to fig. 7 and 8 may have grooves formed at upper and lower end portions of the end plate 150, respectively. Since the first and second hooks 400h and 300c are fixed to the first and second stepped portions 160 and 170 of the end plate 150, the upper plate 400 and the bottom 300a of the module frame 300 may be prevented from protruding from the outermost surface of the end plate 150. Further, the first and second stepped parts 160 and 170 may serve as guides when assembling the end plate 150 with the upper plate 400 and the bottom 300a of the module frame 300.
Referring again to fig. 2, the battery module 100 according to the present embodiment may further include a compression pad 119 positioned between the end plate 150 and the cell stack 120. Compression pad 119 is formed of an elastic member such as polyurethane foam, so that the problem of swelling of the battery cell can be further reduced. In addition, compression pad 119 maintains insulation between end plate 150 and cell stack 120.
Hereinafter, a modified embodiment of the present invention will be described with reference to fig. 9 to 11.
Fig. 9 is an exploded perspective view illustrating a battery module according to another embodiment of the present disclosure. Fig. 10 is a perspective view illustrating a coupling relationship between an upper plate and an end plate in the battery module of fig. 9. Fig. 11 is a perspective view illustrating a coupling relationship between a module frame and an end plate in the battery module of fig. 9.
Referring to fig. 9 and 10, the battery module according to the present embodiment further includes an insulating cover 140 between the end plate 150 and the cell stack 120. The insulating cover 140 may be formed of a plastic injection molding material. As shown in fig. 10, the width of the insulating cover 140 in the Z-axis direction is larger than the width of the end plate 150 in the Z-axis direction. The insulating cover 140 extends over an upper end surface of the end plate 150. At this time, a first step 160 is formed between an upper end portion of the insulating cover 140 in the Z-axis direction and an upper end portion of the end plate 150, and the first hook 400h of the upper plate 400 may be hooked to the first step 160. Specifically, the insulating cover 140 formed inside the end plate 150 recedes by the thickness of the end plate 150, and a step difference is formed by a portion of the insulating cover 140 protruding from the upper end surface of the end plate 150 in the Z-axis direction and the upper end surface of the end plate 150. In a state where the first hook 400h is locked to such a step difference, the upper plate 400 and the end plate 150 may be coupled to each other by welding.
Referring to fig. 9 and 11, the insulating cover 140 extends below the lower end portion of the end plate 150. At this time, a second stepped portion 170 is formed between a lower end portion of the insulating cover 140 in the Z-axis direction and a lower end portion of the end plate 150, and the second hook 300c of the bottom 300a of the module frame 300 may be hooked to the second stepped portion 170. Specifically, the insulating cover 140 formed inside the end plate 150 recedes by the thickness of the end plate 150, and a step difference is formed by a portion of the insulating cover 140 protruding from the lower end surface of the end plate 150 in the Z-axis direction and the lower end surface of the end plate 150. In a state where the second hook 300c is locked to such a step difference, the bottom 300a of the module frame 300 and the end plate 150 may be coupled to each other by welding.
Meanwhile, one or more battery modules according to one embodiment of the present disclosure may be packaged in a battery pack case to form a battery pack.
The above-described battery module and the battery pack including the same may be applied to various devices. These devices may be applied to vehicles such as electric bicycles, electric vehicles, hybrid vehicles, but the present disclosure is not limited thereto, but may be applied to various devices that may use a battery module and a battery pack including the battery module, which also falls within the scope of the present disclosure.
Although the preferred embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concepts of the present disclosure as defined in the appended claims also fall within the scope of the claims.
Description of the reference numerals
100: module frame
140: insulating cover
150: end plate
152: module mounting part
160: a first step part
170: a second step part
300: module frame
400: upper plate
400h: first hook part
300c: second hook part
Cross Reference to Related Applications
The present application claims the benefits of korean patent application 10-2019-013054 filed 24 in 2019 to the korean intellectual property office and korean patent application 10-2020-0082995 filed 6 in 2020 to the korean intellectual property office, the entire disclosures of which are incorporated herein by reference.

Claims (12)

1. A battery module, the battery module comprising:
a cell stack in which a plurality of battery cells are stacked;
a module frame accommodating the battery cell stack and having an open upper portion;
an upper plate covering the battery cell stack at the upper portion of the module frame;
a bus bar frame connected to the cell stack;
end plates located at both sides of the cell stack; and
an insulating cover between the end plates and the cell stack,
wherein the module frame has a structure opened at both sides for opening the battery cell stack in the stacking direction of the battery cells included in the battery cell stack,
wherein the end plates cover the stacking surfaces of the battery cell stacks at both sides of the opening of the module frame,
wherein first hooks protruding downward are formed at both sides of the upper plate,
wherein the end plate has a first stepped portion formed at an upper end portion, and the first hook portion is hooked to the first stepped portion,
wherein second hooks protruding upward are formed at both sides of the bottom of the module frame,
wherein a second stepped portion is formed at a lower end portion of the end plate, and the second hook portion is hooked to the second stepped portion,
wherein each of the upper end portion of the end plate on which the first step is formed and the lower end portion of the end plate on which the second step is formed has a structure protruding in a Z-axis direction perpendicular to one surface of the module frame on which the bottom of the cell stack is placed, and
wherein the end plate and the upper plate and the end plate and the module frame are fixed by the structures of the first hook portion and the first step portion and the structures of the second hook portion and the second step portion, and the fixing direction is identical to the direction in which the swelling of the battery cell occurs,
wherein a width of the insulating cover in the Z-axis direction is larger than a width of the end plate in the Z-axis direction, and the first step is formed between an upper end portion of the insulating cover in the Z-axis direction and an upper end portion of the end plate.
2. The battery module of claim 1, wherein,
the module frame comprises a bottom and two side surface portions facing each other, and
the bus bar frame is located between the side surface portion and the cell stack.
3. The battery module of claim 2, wherein,
the end plate is located at a position adjacent to the stacking surface of the battery cell stack in a direction perpendicular to the direction in which the electrode leads of the battery cells protrude.
4. The battery module of claim 2, further comprising:
an insulating plate located between the bus bar frame and a side surface portion of the module frame.
5. The battery module of claim 1, wherein,
the first and second steps form a groove structure at each of the upper and lower end portions of the end plate.
6. The battery module of claim 1, wherein,
the end plate has module mounting portions formed on both outer edges of the first stepped portion.
7. The battery module of claim 6, wherein,
a first cutout is formed in the upper plate to correspond to the module mounting part, and the upper end portion of the module mounting part is opened by the first cutout.
8. The battery module of claim 7, wherein,
a second cutout portion is formed at a bottom of the module frame to correspond to the module mounting portion, and the lower end portion of the module mounting portion is opened by the second cutout portion.
9. The battery module of claim 1, further comprising:
compression pads located between the end plates and the cell stacks.
10. The battery module of claim 1, wherein,
the second step is formed between a lower end portion of the insulating cover in the Z-axis direction and a lower end portion of the end plate.
11. The battery module of claim 1, wherein,
the end plate is formed of a metal material.
12. A battery pack comprising the battery module according to any one of claims 1 to 11.
CN202080031684.5A 2019-10-24 2020-07-10 Battery module and battery pack including the same Active CN113748564B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
KR10-2019-0133054 2019-10-24
KR20190133054 2019-10-24
KR10-2020-0082995 2020-07-06
KR1020200082995A KR102477607B1 (en) 2019-10-24 2020-07-06 Battery module and battery pack including the same
PCT/KR2020/009089 WO2021080124A1 (en) 2019-10-24 2020-07-10 Battery module and battery pack including same

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