CN113614990A - 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
CN113614990A
CN113614990A CN202080022446.8A CN202080022446A CN113614990A CN 113614990 A CN113614990 A CN 113614990A CN 202080022446 A CN202080022446 A CN 202080022446A CN 113614990 A CN113614990 A CN 113614990A
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China
Prior art keywords
module
battery
surface portion
module frame
set forth
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Granted
Application number
CN202080022446.8A
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Chinese (zh)
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CN113614990B (en
Inventor
崔鍾华
成準烨
朴明基
郑志勳
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LG Energy Solution Ltd
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LG Energy Solution Ltd
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Priority claimed from PCT/KR2020/009062 external-priority patent/WO2021015461A1/en
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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • 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
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular 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
    • H01M50/218—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
    • H01M50/227—Organic material
    • 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
    • H01M50/231—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 having a layered structure
    • 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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

A battery module according to an embodiment of the present disclosure includes: a battery cell stack in which a plurality of battery cells are stacked; and a module frame accommodating the battery cell stack, wherein the module frame includes a first module frame having an open upper portion and a second module frame having an open lower portion, wherein the first module frame includes a first side surface portion, a second side surface portion, and a bottom portion for connecting the first side surface portion and the second side surface portion, wherein the second module frame includes a third side surface portion, a fourth side surface portion, and a top portion for connecting the third side surface portion and the fourth side surface portion, and wherein the first module frame and the second module frame surround the battery cell stack in a state in which the first side surface portion overlaps the third side surface portion and the second side surface portion overlaps the fourth side surface portion.

Description

Battery module and battery pack including the same
Technical Field
Cross Reference to Related Applications
This application claims the benefit of korean patent application No. 10-2019-.
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 capable of ensuring lateral rigidity without having to increase weight.
Background
The secondary battery is easily applied to various product groups and has electrical characteristics such as high energy density, and is commonly applied not only to portable devices but also to electric vehicles or hybrid electric vehicles driven by an electric drive source, energy storage systems, and the like. Such secondary batteries are receiving attention as a new environmentally friendly energy source for improving energy efficiency because they provide a major advantage of significantly reducing the use of fossil fuels and also generate no by-products at all from the use of energy.
Small-sized mobile devices use one to three battery cells per device, while medium-or large-sized devices such as vehicles require high power and large capacity. Therefore, a middle-or large-sized battery module having a plurality of battery cells electrically connected to each other is used.
The middle-or large-sized battery module is preferably manufactured to have as small a size and weight as possible. Therefore, a prismatic battery, a pouch-shaped battery, or the like, which can be stacked with high integration and has a small weight with respect to capacity, is generally used as a battery cell of the middle-or large-sized battery module. In addition, in order to protect the battery cell stack from external impact, heat, or vibration, the battery module may include a frame member, the front and rear surfaces of which are open to receive the battery cell stack in the internal space.
Fig. 1 is an exploded perspective view illustrating a conventional battery module having a cell frame.
Referring to fig. 1, the battery module may include: a battery cell stack 12 formed by stacking a plurality of battery cells 11; a cell frame 20 covering the battery cell stack 12, the front and rear surfaces of the cell frame 20 being open; and end plates 60 for covering the front and rear surfaces of the unit frame 20. In order to form such a battery module, it is necessary to perform horizontal assembly such that the battery cell stack 12 is inserted into the open front or rear surface of the unit frame 20 in the X-axis direction indicated by the arrow in fig. 1. However, in order to stably perform such horizontal assembly, a sufficient clearance (clearance) must be ensured between the cell stack 12 and the cell frame 20. Here, the clearance (clearance) refers to a clearance generated by press fitting or the like. When the clearance is small, damage may be caused to the components during horizontal assembly.
At this time, the height of the unit frames 20 should be designed to be large in consideration of the maximum height of the battery cell stack 12 and an assembly tolerance (tolerance) during insertion. Therefore, unnecessary wasted space may occur.
In addition, during the repeated charging and discharging of the plurality of battery cells 11, the internal electrolyte is decomposed to generate gas, so that a phenomenon of Swelling of the battery cells 11, that is, a Swelling (Swelling) phenomenon may occur. When the plurality of battery cells 11 stacked with high integration swell, the thickness of the cell frame 20 must be made thick to withstand the swelling. However, when the thickness of the cell frame 20 is increased, the thicknesses of the upper and lower surfaces, which are not related to the rigidity against the swelling phenomenon, are also increased, so that the weight of the battery module is unnecessarily increased.
Further, a heat conductive resin layer (not shown) may be formed between the battery cell stack 12 and the cell frame 20. The heat conductive resin layer may serve to transfer heat generated from the battery cell stack to the outside of the battery module and to fix the battery cell stack in the battery module. When the space in the battery module becomes large, the amount of the heat conductive resin layer used may increase more than necessary.
Disclosure of Invention
Technical problem
An object of the present disclosure is to provide a battery module, which improves space utilization, is capable of securing lateral rigidity without increasing weight, and minimizes the amount of a heat conductive resin layer used, 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 may be made within the scope of the technical idea included in the present disclosure.
Technical scheme
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; and a module frame accommodating the battery cell stack, wherein the module frame includes a first module frame having an open upper portion and a second module frame having an open lower portion, wherein the first module frame includes a first side surface portion, a second side surface portion, and a bottom portion for connecting the first side surface portion and the second side surface portion, wherein the second module frame includes a third side surface portion, a fourth side surface portion, and a top portion for connecting the third side surface portion and the fourth side surface portion, and wherein the first module frame and the second module frame surround the battery cell stack in a state in which the first side surface portion overlaps the third side surface portion and the second side surface portion overlaps the fourth side surface portion.
The first and second side surface portions of the first module frame extend up to an upper corner of the second module frame, and the third and fourth side surface portions of the second module frame extend up to a lower corner of the first module frame.
The plurality of battery cells may be stacked in an upright or inverted state so as to be parallel to the first, second, third, and fourth side surface portions.
The first side surface portion may be located between the third side surface portion and the battery cell stack, and the second side surface portion may be located between the fourth side surface portion and the battery cell stack.
An end of each of the third and fourth side surface portions may be weld-bonded to a lower corner portion of the first module frame, thereby forming a bonding portion.
At least one of the third and fourth side surface portions may include a bent portion extending longer than the first and second side surface portions and bent inward.
At least one of the third and fourth side surface portions may include a mounting portion extending longer than the first and second side surface portions and bent outward.
The mounting portion may be positioned adjacent to a lower corner of the first module frame.
One or more through holes may be formed in the mounting portion.
The battery module may further include an adhesive member located in at least one of between the first and third side surface portions and between the second and fourth side surface portions.
The battery module may further include a rigid member located in at least one of between the first and third side surface portions and between the second and fourth side surface portions.
The rigid member may include at least one of a plastic member and a metal plate material.
The first module frame may be a metal plate material in which the first side surface portion, the second side surface portion, and the bottom are integrated, and the second module frame may be a metal plate material in which the third side surface portion, the fourth side surface portion, and the top are integrated.
The battery module may further include a thermally conductive resin layer between the bottom and the battery cell stack.
Both side surfaces of the module frame may be thicker than the upper and lower surfaces.
Advantageous effects
According to the embodiments of the present disclosure, by arranging the module frames one above the other, not only the clearance between the battery cell stack and the frames is reduced and the space utilization can be improved, but also the lateral rigidity can be ensured without having to increase the weight.
Furthermore, the amount of heat conductive resin applied can be minimized while improving space utilization between the battery cell stack and the frame.
Drawings
Fig. 1 is an exploded perspective view illustrating a conventional battery module having a cell frame.
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 constituting the battery module of fig. 2 are coupled.
Fig. 4 is a sectional view taken along a cutting line a-a' of fig. 3.
Fig. 5 is a perspective view for explaining a welded joint between a first module frame and a second module frame.
Fig. 6 is a sectional view for explaining a battery module in which a first module frame and a second module frame are coupled by an adhesive member.
Fig. 7 and 8 are perspective views for explaining first and second module frames according to a modified embodiment of the present disclosure.
Fig. 9 and 10 are perspective views for explaining first and second module frames according to a modified embodiment of the present disclosure.
Fig. 11 is a sectional view of a battery module for illustrating a rigid member according to the present disclosure.
Detailed Description
Hereinafter, 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 them. The present disclosure may be modified in various different ways and is not limited to the embodiments set forth herein.
Parts irrelevant to the description will be omitted to clearly describe the present disclosure, and like reference numerals denote like elements throughout the application.
Further, in the drawings, the size and thickness of each element are arbitrarily shown for convenience of description, and the present disclosure is not necessarily limited to those shown 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 exaggerated for convenience of description.
In addition, it will be understood that when an element such as a layer, film, region or panel is referred to as being "on" or "over" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, it can be directly on the other element without intervening elements. Further, the words "on … …" or "above … …" mean disposed above or below the reference portion, and do not necessarily mean disposed at the upper end of the reference portion facing the opposite direction of gravity.
Further, throughout this application, when a part is referred to as "including" a certain component, it means that the part may further include other components, without excluding other components, unless otherwise specified.
Further, throughout the application, when referred to as "plane", it means when the target portion is viewed from the upper side, and when referred to as "profile", it means when the target portion is viewed from the side of the cross section cut perpendicularly.
Fig. 2 is an exploded perspective view illustrating a battery module 100 according to an embodiment of the present disclosure. Fig. 3 is a perspective view illustrating a state in which components constituting the battery module 100 of fig. 2 are coupled.
Referring to fig. 2 and 3, a battery module 100 according to an embodiment of the present disclosure includes: a battery cell stack 120 in which a plurality of battery cells 110 are stacked; and a module frame 200 accommodating the battery cell stack 120.
The module frame 200 includes a first module frame 300 having an open upper portion and a second module frame 400 having an open lower portion. Further, both the first and second module frames 300 and 400 are open at their front and rear surfaces, the end plates 150 are located in the open front and rear surfaces, and the bus bar frames 130 are located between the battery cell stack 120 and the end plates 150.
Specifically, the first module frame 300 includes a first side surface portion 311, a second side surface portion 312, and a bottom portion 330, wherein the first side surface portion 311 and the second side surface portion 312 are parallel to each other, and the bottom portion 330 connects the first side surface portion 311 and the second side surface portion 312. That is, the first module frame 300 has a plate-shaped structure bent to continuously surround the bottom surface and both side surfaces of the battery cell stack 120, and the first module frame 300 may be a metal plate material in which the first side surface portion 311, the second side surface portion 312, and the bottom portion 330 are integrated. Further, the first module frame 300 may be a U-shaped frame in which a sectional shape cut along the yz plane appears like a U-shape, but is not limited thereto.
The second module frame 400 includes a third side surface portion 411, a fourth side surface portion 412, and a top 430, wherein the third side surface portion 411 and the fourth side surface portion 412 are parallel to each other, and the top 430 connects the third side surface portion 411 and the fourth side surface portion 412. That is, the second module frame 400 has a plate-shaped structure bent to continuously surround the upper surface and both side surfaces of the battery cell stack 120, and the second module frame 400 may be a metal plate material in which the third side surface portion 411, the fourth side surface portion 412, and the top 430 are integrated. Further, the second module frame 400 may be a U-shaped frame in which a sectional shape cut along the yz plane appears like a U-shape, but is not limited thereto.
The first and second module frames 300 and 400 surround the top, bottom, and both side surfaces of the battery cell stack 120 in a state in which the first side surface portion 311 overlaps the third side surface portion 411 and the second side surface portion 312 overlaps the fourth side surface portion 412. This part will be described again below with reference to fig. 4.
Fig. 4 is a sectional view taken along a cutting line a-a' of fig. 3.
Referring to fig. 4, the battery cell stack 120 is received between the first and second module frames 300 and 400 in a state in which the first and second side surface portions 311 and 312 and 412 overlap.
Each of the plurality of battery cells 110 constituting the battery cell stack 120 is preferably stacked in an upright or inverted state so as to be parallel to the first and second side surface portions 311 and 312 of the first module frame 300 and the third and fourth side surface portions 411 and 412 of the second module frame 400.
At this time, when the charge/discharge process of the battery cell 110 is repeated, the internal electrolyte is decomposed to generate gas, and a Swelling (Swelling) phenomenon in which the external shape thereof swells may occur. In particular, considering the stacking direction of the battery cells 110, the expansion is mainly in the direction of the arrow in fig. 4 (Y-axis direction and the opposite direction thereto), and as the number of the battery cells 110 increases, the internal pressure increases due to the expansion phenomenon.
In order to withstand such a swelling phenomenon, the frame surrounding the battery cell stack must have rigidity above a prescribed level, and for this purpose, the thickness needs to be made thick to some extent. In the case of the conventional cell frame 20 shown in fig. 1, when the thickness is increased, the thicknesses of the upper and lower surfaces, which are not related to the swelling phenomenon, are also increased, and thus the weight of the battery module is unnecessarily increased.
Unlike the conventional single frame 20, the module frame in the present embodiment may be formed of the first and second module frames 300 and 400, i.e., two module frames 300 and 400, and the first side surface portion 311 overlaps the third side surface portion 411 and the second side surface portion 312 overlaps the fourth side surface portion 412, so that both side surfaces may form a thicker structure than the upper and lower surfaces. That is, both side surfaces of the module frame may be implemented to be thicker such that the swelling phenomenon of the battery cells 110 can be directly controlled, and at the same time, the upper and lower surfaces are implemented to be relatively thin, whereby the volume and weight of the battery module can be prevented from being unnecessarily increased.
In the case of a middle-or large-sized device, since a plurality of such battery modules are assembled and formed, unnecessary reduction in volume or weight of each battery module may have a significant effect on improvement in energy density as an energy storage device or increase in overall spatial efficiency.
On the other hand, referring back to fig. 4 together with fig. 2, the first module frame 300 has a structure in which a metal plate is bent, wherein lower corners 320 are formed between the first side surface portion 311 and the bottom portion 330 and between the second side surface portion 312 and the bottom portion 330, respectively. Similarly, the second module frame 400 also has a structure in which a metal plate material is bent, wherein upper corners 420 are formed between the third side surface portion 411 and the top 430 and between the fourth side surface portion 412 and the top 430, respectively.
In this case, the first and second side surface parts 311 and 312 of the first module frame 300 may extend up to the upper corner part 420 of the second module frame 400, and the third and fourth side surface parts 411 and 412 of the second module frame 400 may extend up to the lower corner part 320 of the first module frame 300.
When the swelling phenomenon occurs in the battery cell 110, the deformation force may be concentrated not only on the first to fourth side surface portions 311, 312, 411, and 412, but also on the corner portions, which may cause a problem of cracking at the corner portions.
Thus, the first and second side surface portions 311 and 312 of the first module frame 300 form a structure extending to the upper corner 420 of the second module frame 400, and the third and fourth side surface portions 411 and 412 of the second module frame 400 form a structure extending to the lower corner 320 of the first module frame 300, so that deformation forces applied to the corners can compensate for each other between the first and second module frames 300 and 400.
On the other hand, in the conventional cell frame 20 of fig. 1, the battery cell stack 12 is inserted horizontally in the X-axis direction indicated by the arrow. Just as the cell frames 20 should not be caught at the maximum height of the configuration of the battery cell stack 12 during horizontal insertion, assembly tolerances at the time of insertion must be taken into consideration, so that the height of the cell frames 20 must be designed with a margin.
In contrast, in the module frame 200 of fig. 2, the battery cell stack 12 can be assembled in the vertical direction (Z-axis and its opposite direction) via the opened upper portion of the first module frame 300 and the opened lower portion of the second module frame 400. Therefore, the height of the module frame 200 can be set lower, thereby constituting a more compact battery module. That is, since the clearance between the battery cell stack and the frame can be reduced to increase the space utilization, the capacity and output of the battery module 100 can be more improved.
On the other hand, referring back to fig. 4, the first side surface part 311 may be located between the third side surface part 411 and the cell stack 120, and the second side surface part 312 may be located between the fourth side surface part 412 and the cell stack 120.
In other words, the second module frame 400 may be formed to have a wider width than the first module frame 300 with respect to the Y-axis direction, so that the second module frame 400 may be located more outside with respect to the battery cell stack 120.
Of course, the first module frame 300 may be formed to have a wider width and thus be located more outside on the basis of the cell stack 120, or may be configured such that the first module frame 300 and the second module frame 400 are alternately positioned, but it is more preferable that the second module frame 400 covering the upper portion of the cell stack 120 is formed to have a wider width in consideration of the order or ease of the process, as shown in fig. 4.
Specifically, a heat conductive resin layer 331, which will be described later, is formed on the bottom portion 330 of the first module frame 300, and the battery cell stack 120 is disposed on the heat conductive resin layer 331. At this time, the first and second side surface portions 311 and 312 of the first module frame 300 may function as a kind of guide member in a process of applying a heat conductive resin to the bottom 330 to form the heat conductive resin layer 331 or disposing the battery cell stack 120 on the heat conductive resin layer 331.
Further, the battery cell stack 120 is disposed on the first module frame 300, and then the second module frame 400 is assembled in the vertical direction (the Z-axis direction and the opposite direction thereof), and thus the second module frame 400 has a width wider than the first frame 300 in the Y-axis direction, so that the third and fourth side surface portions 411 and 412 are inserted into the outsides of the first and second side surface portions 311 and 312, respectively, to be more easily assembled.
Fig. 5 is a perspective view for explaining the welded coupling between the first module frame and the second module frame, and other configurations are omitted for convenience of description, showing only the first module frame 300a and the second module frame 400 a.
Referring to fig. 5, the third and fourth side surface portions 411a and 412a of the second module frame 400a may be coupled by welding or the like in a state where the extended end portions thereof are in contact with the lower corner portion 320a of the first module frame 300 a. That is, each lower corner portion 320a of the first module frame 300a and the end portion of the third side surface portion 411a and the end portion of the fourth side surface portion 412a of the second module frame 400a corresponding thereto are joined by a method such as welding, so that the joint CP may be formed. In fig. 5, only a state where the fourth side surface portion 412a and the lower corner portion 320a are welded and joined to form the joint portion CP is shown in detail, but it is needless to say that the extended end portion of the third side surface portion 411a may also form the joint portion as described above.
Fig. 6 is a sectional view for explaining a battery module in which a first module frame and a second module frame are coupled via an adhesive member.
Referring to fig. 6, the battery module according to the present embodiment may further include an adhesive member 500 located in at least one of between the first and third side surface portions 311b and 411b and between the second and fourth side surface portions 312b and 412 b. The adhesive member 500 is used for fastening or bonding between the first module frame 300b and the second module frame 400b, and may include resin or an adhesive tape including an adhesive material.
Since the method of applying the adhesive member 500 is not limited, the second module frame 400b may be assembled after applying or adhering the adhesive member 500 to the outer surfaces of the first and second side surface portions 311b and 312b, and the second module frame 400b may be assembled after applying or adhering the adhesive member 500 to the inner surfaces of the third and fourth side surface portions 411b and 412 b.
The adhesion method in fig. 5 or 6 corresponds to an embodiment for bonding the first module frames 300a and 300b and the second module frames 400a and 400b, and in the present embodiment, methods such as bonding, screwing, and riveting may be applied in addition to the welding bonding or the adhesive member without limitation.
In addition, referring back to fig. 2, a heat conductive resin may be applied to the bottom 330 of the first module frame 300 to form a heat conductive resin layer 331.
In the cell frame 20 of fig. 1, since the heat conductive resin is injected through the injection port of the cell frame 20 after the battery cell stack 12 is inserted, there is a problem in that the heat conductive resin is injected more than necessary.
In the present embodiment, since the battery cell stack 120 is positioned after the thermal conductive resin is applied in advance, over-injection beyond necessity as in the conventional case can be prevented.
The heat conductive resin of the heat conductive resin layer 331 may include a heat conductive adhesive material, and in particular, may include at least one of a Silicone (Silicone) material, a Urethane (Urethane) material, and an Acrylic (Acrylic) material. The thermally conductive resin is liquid during application, but is cured after application, and thus may perform a function of fixing one or more battery cells 110 constituting the battery cell stack 120. In addition, it has excellent heat conductive characteristics, and is capable of rapidly transferring heat generated from the battery cells 110 to a heat sink (not shown) located under the battery module, thereby preventing the battery module from overheating.
Fig. 7 and 8 are perspective views for explaining the first and second module frames 300c and 400c according to a modified embodiment of the present disclosure, and other configurations are omitted for convenience of description, and only the first and second module frames 300c and 400c are shown.
Referring to fig. 7, at least one of the third and fourth side surface portions 411c and 412c may extend longer than the first and second side surface portions 311c and 312c, and the extended portion may be bent inward (B direction).
Fig. 8 is a view illustrating a state after the extended portion in fig. 7 is bent inward, and referring to fig. 8, the extended portions of the third and fourth side surface portions 411c and 412c are bent to form a bent portion 440.
By forming the bent portion 440, not only mechanical fastening between the first module frame 300c and the second module frame 400c may be performed, but also a deformation force applied to the lower corner portion 320c of the first module frame 300c due to the above expansion phenomenon may be further compensated by the bent portion 440.
In addition, although not specifically shown, welding may be further performed between the bottom portion 330c and the end of the bent portion 440.
Fig. 9 and 10 are perspective views for explaining the first and second module frames 300d and 400d according to a modified embodiment of the present disclosure, and other configurations are omitted for convenience of description, and only the first and second module frames 300d and 400d are shown.
Referring to fig. 9, at least one of the third and fourth side surface portions 411d and 412d may extend longer than the first and second side surface portions 311d and 312d, and the extended portion may be bent outward (C direction). In this case, one or more through holes 451 may be further formed in the extension portions of the third and fourth side surface portions 411d and 412 d.
Fig. 10 is a view illustrating a state after the extended portions in fig. 9 are bent outward, and referring to fig. 10, the extended portions of the third and fourth side surface portions 411d and 412d are bent to form the mounting portion 450.
In implementing a battery pack including a plurality of battery modules, means for fixing the battery modules to a pack frame (not shown) is necessary. This is because, when the battery pack is applied to a device described below, it is necessary to ensure safety against external vibration or impact.
According to the conventional case, the battery pack frame is fixed by forming separate fastening structures at the four side surface corners of the battery module, but in the present embodiment, the battery module may be fixed to the battery pack frame (not shown) by forming the mounting parts 450.
In particular, a plurality of through holes 451 are formed in the mounting part 450 of fig. 9 and 10, and bolts may be inserted through the through holes 451 to be fastened to a pack frame (not shown). The number of the through holes 451 is not particularly limited, but it is preferable that the number is two or more for firm fixation, as shown in fig. 10.
However, the through holes 451 in fig. 9 and 10 are examples for illustrating an example of a fixing method using the mounting part 450, and as a modification, a form in which the mounting part 450 is fixed to the battery pack frame by using an adhesive member or welding without these through holes may also be used.
The swelling of the battery cell stack can be easily controlled by the second module frame 400d formed with the mounting parts 450, and at the same time, the battery module can be fixed to the battery pack frame even though the fastening structure is not separately formed. Further, the mounting part 450 may apply various fixing and fastening structures, such as bolt fastening through a through hole, adhesion by an adhesive member, welding bonding, and the like.
Further, in order to control the expansion of the battery cell stack and reduce the deformation force at the corner portions, it is preferable that the third and fourth side surface portions 411d and 412d extend up to the lower corner portions 320d of the first module frame 300d, and the mounting portions 450 are positioned adjacent to the lower corner portions 320d, respectively.
Fig. 11 is a sectional view of the battery module for explaining the rigid member.
Referring to fig. 11, the battery module according to the present embodiment may further include a rigid member 600 located in at least one of between the first and third side surface portions 311e and 411e and between the second and fourth side surface portions 312e and 412 e.
The rigid member 600 may be provided at the above-described position to secure additional rigidity with respect to the swelling phenomenon in which the battery cells 110 constituting the battery cell stack 120 swell in the arrow direction (the Y-axis direction and the opposite direction thereto). For this purpose, the rigid member 600 preferably includes at least one of a plastic member and a metal plate material.
In addition to the above-described configuration in which the first to fourth side surface portions 311e, 312e, 411e, and 412e overlap, the rigid member 600 may be additionally inserted in consideration of the number or degree of expansion of the battery cells 110 constituting the battery cell stack 120. As in the present embodiment, the module frame formed of the two module frames 300e and 400e has a configuration that facilitates additional insertion of the stiffener 600.
On the other hand, although not specifically shown, the adhesive member in fig. 6 is further positioned between each of the first to fourth side surface portions 311e, 312e, 411e, and 412e and the rigid member 600, as necessary, to ensure adhesive force.
The above-described one or more Battery modules according to the present embodiment may be mounted together with various control and protection systems, such as a Battery Management System (BMS) and a cooling System, to form a Battery pack.
The battery module or the battery pack including the battery module may be applied to various devices. These devices may be applied to vehicles such as electric bicycles, electric vehicles, hybrid vehicles, etc., but the present disclosure is not limited thereto, and may be applied to various devices capable of using a secondary battery.
Although 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 idea of the present disclosure defined in the following claims also belong to the scope of the claims.
Description of reference numerals
100: battery module
110: battery unit
120: battery cell stack
300: first module frame
331: heat-conducting resin layer
400: a second module frame.

Claims (16)

1. A battery module, comprising:
a battery cell stack in which a plurality of battery cells are stacked; and
a module frame accommodating the battery cell stack,
wherein the module frame includes a first module frame having an open upper portion and a second module frame having an open lower portion,
wherein the first module frame includes a first side surface portion, a second side surface portion, and a bottom portion for connecting the first side surface portion and the second side surface portion,
wherein the second module frame includes a third side surface portion, a fourth side surface portion, and a top for connecting the third side surface portion and the fourth side surface portion, and
wherein the first and second module frames surround the battery cell stack in a state in which the first side surface portion overlaps the third side surface portion and the second side surface portion overlaps the fourth side surface portion.
2. The battery module as set forth in claim 1,
wherein the first and second side surface portions of the first module frame extend all the way to an upper corner portion of the second module frame, and
the third and fourth side surface portions of the second module frame extend up to a lower corner of the first module frame.
3. The battery module as set forth in claim 1,
wherein the plurality of battery cells are stacked in an upright or inverted state so as to be parallel to the first, second, third, and fourth side surface portions.
4. The battery module as set forth in claim 1,
wherein the first side surface portion is located between the third side surface portion and the battery cell stack, and
the second side surface portion is located between the fourth side surface portion and the battery cell stack.
5. The battery module as set forth in claim 4,
wherein an end of each of the third and fourth side surface portions is weld-bonded to a lower corner portion of the first module frame, thereby forming a bonding portion.
6. The battery module as set forth in claim 4,
wherein at least one of the third and fourth side surface portions includes a bent portion extending longer than the first and second side surface portions and bent inward.
7. The battery module as set forth in claim 4,
wherein at least one of the third and fourth side surface portions includes a mounting portion extending longer than the first and second side surface portions and bent outward.
8. The battery module as set forth in claim 7,
wherein the mounting portion is positioned adjacent to a lower corner of the first module frame.
9. The battery module as set forth in claim 7,
wherein one or more through holes are formed in the mounting portion.
10. The battery module as set forth in claim 1,
further comprising an adhesive member located in at least one of between the first and third side surface portions and between the second and fourth side surface portions.
11. The battery module as set forth in claim 1,
further comprising a rigid member located in at least one of between the first and third side surface portions and between the second and fourth side surface portions.
12. The battery module as set forth in claim 11,
wherein the rigid member comprises at least one of a plastic member and a metal plate material.
13. The battery module as set forth in claim 1,
wherein the first module frame is a metal plate material in which the first side surface portion, the second side surface portion and the bottom portion are integrated, and
the second module frame is a metal plate material in which the third side surface portion, the fourth side surface portion, and the top portion are integrated.
14. The battery module as set forth in claim 1,
further comprising a thermally conductive resin layer between the bottom and the battery cell stack.
15. The battery module as set forth in claim 1,
wherein both side surfaces of the module frame are thicker than the upper and lower surfaces.
16. A battery pack comprising one or more battery modules according to claim 1.
CN202080022446.8A 2019-07-19 2020-07-10 Battery module and battery pack including the same Active CN113614990B (en)

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