Battery module with improved stacking structure and battery pack containing the battery module

Abstract

The present invention relates to a battery module prepared by an improved battery cell stacking method, and a battery pack including the battery module. By alternately stacking a second battery assembly and a first battery assembly, a plurality of battery cells are connected into a single layer, which can improve the space efficiency in the battery module and the battery pack.

Description

Technical Field

[0001] The present application claims priority based on Korean Patent Application No. 10-2020-0113871 filed on September 7, 2020, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a battery module prepared by using an improved battery unit lamination method, and a battery pack including the battery module. Background Art

[0003] Recently, secondary batteries that can be charged and discharged have been widely used as energy sources for wireless mobile devices. In addition, secondary batteries have attracted attention as power sources for electric vehicles (EVs) and hybrid electric vehicles (HEVs), which are solutions to air pollution caused by existing gasoline and diesel vehicles that use fossil fuels.

[0004] In small mobile devices, one or a few battery cells are used per device, whereas in medium-to-large devices such as automobiles, medium-to-large battery modules electrically connected to a plurality of battery cells are used due to the need for high power and large capacity.

[0005] Since the medium and large battery modules are preferably manufactured with the smallest possible size and weight, square batteries and pouch batteries that can be charged with high integration and have a small weight-to-capacity ratio are mainly used as battery cells of the medium and large battery modules. In particular, pouch batteries used as external components have received attention in recent years due to their advantages such as light weight and low manufacturing cost.

[0006] Furthermore, in order to provide the output and requirements required for a predetermined device required for a medium-sized battery module, a plurality of battery cells should be electrically connected in series and should be able to maintain a stable structure against external forces.

[0007] Figure 1 shows the structure of a conventional battery module, and Figure 2 is schematically shown in Figure 1 FIG. 1 is a diagram showing a structure in which battery cells are stacked in a partial area A of a battery module. Figure 1 and Figure 2 A conventional battery module 10 includes a battery stack produced by stacking n battery cells 12 in a housing 11. Several or tens of battery modules 10 are connected to form a battery pack.

[0008] On the other hand, the increase in the volume of the battery pack leads to an increase in the volume of the external device to which the battery pack is applied, causing design constraints. In particular, when the battery pack is used as a large-capacity secondary battery for driving a motor of an electric vacuum cleaner, an electric scooter, or an automobile (electric vehicle or hybrid vehicle), the volume of the battery pack needs to be minimized due to the narrow installation space of the battery pack. Summary of the invention

[0009] Technical issues

[0010] In order to solve the above-mentioned problems of the prior art, an object of the present invention is to provide a battery module using an improved battery cell stacking method capable of improving space utilization of the battery module and the battery pack, and a battery pack including the battery module.

[0011] Technical Solution

[0012] The present invention provides a battery module prepared by an improved battery cell stacking method. In one embodiment, the battery module according to the present invention includes: a tray in which a battery cell receiving portion is formed; and a first battery assembly accommodated in the battery cell receiving portion of the tray and obtained by electrically connecting and arranging a plurality of battery cells on a single layer; and a second battery assembly accommodated in the battery cell receiving portion of the tray and obtained by electrically connecting and arranging a plurality of battery cells on a single layer. At this time, the battery cell includes a battery body, a first electrode lead and a second electrode lead protruding in two directions around the battery body, and includes a first platform and a second platform, the first platform and the second platform are in areas where the first electrode lead and the second electrode lead are respectively connected to the battery body.

[0013] In a specific example, a plurality of first receiving grooves are formed on one surface of a first battery assembly, the plurality of first receiving grooves are formed in a space where a first electrode lead and a second electrode lead of battery cells adjacent to each other are connected, and a battery body of a battery cell of a second battery assembly is accommodated in each of the first receiving grooves of the first battery assembly, and the battery bodies of the battery cells included in each of the first battery assembly and the second battery assembly are arranged on the same layer. In addition, in a battery module according to the present invention, an insulating pad and a cooling pad may be arranged between the first battery assembly and the second battery assembly.

[0014] In one embodiment, in the battery module according to the present invention, a plurality of second receiving grooves are formed on one surface of the second battery assembly, and the plurality of second receiving grooves are formed in the space where the first electrode lead and the second electrode lead of the battery cells adjacent to each other are connected. At this time, the battery bodies of the battery cells of the first battery assembly are accommodated in the respective second receiving grooves of the second battery assembly.

[0015] In one embodiment, a length of the battery body in a region where the first electrode lead and the second electrode lead protrude is greater than a length of the battery body in a region where the first electrode lead and the second electrode lead do not protrude.

[0016] In another embodiment, one side surface of the battery cell may have a structure protruding in a region where the battery body is formed. In addition, the other side surface of the battery cell may have a flat structure.

[0017] In one embodiment, the battery module according to the present invention includes m first battery assemblies arranged on the same layer, where m is an integer greater than 2. At this time, the first receiving slot of the jth first battery assembly and the first receiving slot of the (j+1)th first battery assembly are arranged on the same axis, where j is an integer equal to or greater than 1 and equal to or less than (n-1).

[0018] In another embodiment, the battery module according to the present invention includes n second battery assemblies arranged on the same layer, where n is an integer greater than 2. In this case, the second receiving slot of the kth second battery assembly and the second receiving slot of the (k+1)th second battery assembly are arranged on the same axis, where k is an integer equal to or greater than 1 and equal to or less than (m-1).

[0019] In one embodiment, the insulating pad according to the present invention is arranged between the first battery assembly and the second battery assembly. In a specific example, the insulating pad is arranged on the area in contact with the first platform and the second platform of the battery cells included in the first battery assembly and the second battery assembly. Alternatively, the insulating pad is arranged on the area in contact with the first platform and the second platform and the first electrode lead and the second electrode lead.

[0020] In another embodiment, the cooling pad of the battery module according to the present invention is arranged between the first battery assembly and the second battery assembly. In a specific example, the cooling pad is arranged on an area in contact with the battery body of the battery cells included in the first battery assembly and the second battery assembly.

[0021] Furthermore, in the battery module according to the present invention, each of the first battery assembly and the second battery assembly has a structure in which a plurality of battery cells are electrically connected in series to each other.

[0022] In another example, in the battery module according to the present invention, the battery bodies of the battery cells included in the first battery assembly and the second battery assembly are arranged on the same layer. In addition, the first battery assembly and the second battery assembly are stacked in a plurality of layers.

[0023] In addition, the present invention provides a battery pack including the battery module.

[0024] Beneficial Effects

[0025] According to the battery module with improved battery cell stacking method and the battery pack including the battery module of the present invention, the space utilization of the battery module and the battery pack can be improved by alternately stacking the first battery assembly and the second battery assembly (in the first battery assembly and the second battery assembly, multiple battery cells are connected on a single layer). BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The structure of a conventional battery module is shown.

[0027] Figure 2 is schematically Figure 1 FIG. 4 is a diagram showing a structure in which battery cells are stacked in a partial area A of a battery module.

[0028] Figure 3 1 is a schematic diagram of a battery module according to an embodiment of the present invention and a cross-sectional view (AA') of the battery module.

[0029] Figure 4 is a diagram schematically showing a battery assembly of a battery module according to one embodiment of the present invention.

[0030] Figure 5 is a view showing a cross-sectional view of a battery module and a configuration of a battery cell according to another embodiment of the present invention.

[0031] 6A to 6F is a diagram illustrating an assembling process of a battery module according to another embodiment of the present invention.

[0032] Figure 7 is a diagram schematically showing a battery module provided with an insulating pad during assembly of a battery module according to still another embodiment of the present invention.

[0033] Figure 8 1 is a schematic diagram of a battery module according to another embodiment of the present invention and a cross-sectional view (AA′) of the battery module.

[0034] FIG. 9A to FIG. 9G is a diagram illustrating an assembling process of a battery module according to still another embodiment of the present invention.

[0035] Fig.10 is a schematic diagram of a battery module according to yet another embodiment of the present invention. DETAILED DESCRIPTION

[0036] Since the present invention allows various changes and numerous embodiments, specific embodiments will be shown in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific form disclosed, and it should be understood that all changes, equivalents and substitutes included in the spirit and scope of the present invention.

[0037] In the present application, it should be understood that terms such as "including" or "having" are intended to indicate features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, and they do not preclude the possibility of the presence or addition of one or more other features or quantities, steps, operations, components, parts, or combinations thereof. In addition, when a part such as a layer, a film, a region, a plate, etc. is referred to as being "on" another part, this includes not only the case where the part is "directly" "on" another part, but also the case where other parts are interposed between the two. On the other hand, when a part such as a layer, a film, a region, a plate, etc. is referred to as being "under" another part, this includes not only the case where the part is "directly" "under" another part, but also the case where other parts are interposed between the two. In addition, being set to "on" in the present application may include being set at the bottom and the top.

[0038] The present invention relates to a battery module prepared by an improved battery cell stacking method, and a battery pack including the battery module.

[0039] According to the battery module with improved battery cell stacking method and the battery pack including the battery module of the present invention, the space utilization of the battery module and the battery pack can be improved by alternately stacking the first battery assembly and the second battery assembly (in the first battery assembly and the second battery assembly, multiple battery cells are connected on a single layer).

[0040] Hereinafter, a battery module prepared by an improved battery cell lamination method according to the present invention and a battery pack including the battery module will be described in detail.

[0041] In one embodiment, a battery module according to the present invention includes: a tray in which a battery cell storage portion is formed; a first battery assembly, which is accommodated in the battery cell storage portion of the tray and is obtained by electrically connecting and arranging a plurality of battery cells on a single layer; and a second battery assembly, which is accommodated in the battery cell storage portion of the tray and is obtained by electrically connecting and arranging a plurality of battery cells on a single layer.

[0042] At this time, the battery cell includes a battery body, a first electrode lead and a second electrode lead protruding in two directions around the battery body, and includes a first platform and a second platform, and the first platform and the second platform are in the area where the first electrode lead and the second electrode lead are respectively connected to the battery body. The battery cell may have a structure in which the first platform and the second platform are formed relatively widely on both sides of the battery cell and the smaller parts of the first electrode lead and the second electrode lead are exposed by the first platform and the second platform, respectively. Specifically, the area of ​​each platform may be more than 5 times the area of ​​the exposed electrode lead. For example, the area of ​​each platform may correspond to 5 to 20 times, 7 to 15 times, or about 10 times the area of ​​the exposed electrode lead. The battery cell according to the present invention can minimize the exposure of the electrode lead with a risk of short circuit by forming a large area platform, and can ensure a buffer area when gas is generated in the battery body.

[0043] In one embodiment, in a battery module according to the present invention, a plurality of first receiving grooves are formed on one surface of a first battery assembly, and a plurality of first receiving grooves are formed in a space where first electrode leads and second electrode leads of battery cells adjacent to each other are connected. In addition, the battery bodies of the battery cells of the second battery assembly are accommodated in the respective first receiving grooves of the first battery assembly, and the battery bodies of the battery cells included in each of the first battery assembly and the second battery assembly are arranged on the same layer.

[0044] Furthermore, an insulating pad and a cooling pad may be disposed between the first battery assembly and the second battery assembly.

[0045] In a specific example, a battery module according to the present invention includes a first battery assembly and a second battery assembly (in the first battery assembly and the second battery assembly, a plurality of battery cells are connected on a single layer). Here, the second battery assembly is stacked on one surface of the first battery assembly. At this time, the battery cells constituting the first battery assembly and the battery cells constituting the second battery assembly are arranged alternately. This means that the battery bodies of the battery cells constituting the first battery assembly and the battery bodies of the battery cells constituting the second battery assembly are arranged alternately. Therefore, the battery bodies of the battery cells included in the first battery assembly and the second battery assembly can be arranged on the same layer, and the space utilization of the battery module can be improved by this battery module structure.

[0046] In the present invention, the tray is a housing for accommodating a battery cell and has a structure in which a battery cell receiving portion is formed inside. In one embodiment, the tray may be a housing with one side open, and may include a cover covering one surface of the housing. In addition, the tray may be made of a material commonly used for a tray for accommodating a battery cell, and the material may be an insulating material.

[0047] The first battery assembly and the second battery assembly are accommodated in the tray, in which a plurality of battery cells are electrically connected and arranged in a single layer. Here, rather than the conventional battery cell stack being accommodated in the tray, the battery assembly on a single layer is accommodated in the tray, so the tray preferably has an appropriate width and length.

[0048] In addition, if the battery cell is a secondary battery capable of charging and discharging, there is no particular limitation. In a specific example, the battery cell is a pouch-type unit battery, and an electrode assembly having a positive electrode / separator / negative electrode structure is embedded in the external material of the laminate sheet while being connected to an electrode lead formed on the outside of the external material. The electrode lead can be pulled to the outside of the sheet and can extend in the same or opposite directions to each other. In addition, in the present invention, in order to electrically connect a plurality of battery cells, it is preferred that a pair of electrode leads extend in opposite directions.

[0049] In the present invention, the battery cell includes a battery body, first and second electrode leads protruding in two directions around the battery body, and includes first and second platforms in areas where the first and second electrode leads are respectively connected to the battery body.

[0050] The battery body is an area including an electrode assembly having a positive electrode / separator / negative electrode structure, and the first platform and the second platform refer to areas where the first electrode lead and the second electrode lead are respectively connected to the battery body. Here, the platform refers to a space that does not include an electrode plate and an electrode assembly in the internal structure of a battery cell, and the electrode plate and the separator are stacked in the electrode assembly. That is, the first platform and the second platform may refer to areas where the first electrode lead and the second electrode lead are respectively connected to the battery body.

[0051] In one embodiment, a length of the battery body in a region where the first electrode lead and the second electrode lead protrude is greater than a length of the battery body in a region where the first electrode lead and the second electrode lead do not protrude.

[0052] In a specific example, in the battery cell, the width W of the battery body is greater than the length L of the battery body. That is, in the battery cell of the present invention, the distance between the first electrode lead and the second electrode lead is smaller than that in a conventional battery.

[0053] That is, when current flows from the first electrode lead to the second electrode lead, the distance the current flows through during the process of the current flowing from the first lead electrode to the second lead electrode is reduced. Therefore, the internal resistance of the battery cell can be reduced.

[0054] In another embodiment, the battery cell may have a structure protruding from an area where the battery body is formed. Specifically, one side surface of the battery cell has a structure protruding from an area where the battery body is formed, and the other side surface of the battery cell has a flat structure. Here, the flat structure means that the bottom of the battery cell is flat, and the bottom surfaces of the first and second electrode leads and the first and second platforms are located on the same line as the bottom surface of the battery body.

[0055] In particular, when the second battery assembly is stacked on top of the first battery assembly, the protruding areas of the battery cells are stacked to face each other. At this time, the protruding areas of the battery cells in the first battery assembly are arranged in the second receiving grooves of the second battery assembly, and the protruding areas of the battery cells in the second battery assembly are arranged in the first receiving grooves of the first battery assembly.

[0056] In addition, in the second battery assembly, the area opposite to the protruding area of ​​the battery cell has a flat structure. That is, the other side surface of the second battery assembly has a flat structure. Therefore, the battery module of the present invention can improve space utilization.

[0057] In addition, each of the first battery assembly and the second battery assembly may have a structure in which a plurality of battery cells are electrically connected in series, and each battery assembly may include a terminal for electrically connecting the first battery assembly with the second battery assembly or a terminal to be electrically connected to an external power source.

[0058] In one embodiment, the first battery assembly according to the present invention has a structure in which a plurality of battery cells are electrically connected and arranged on a single layer. The first battery assembly may include 2 to 30, 2 to 20, 2 to 15 or 2 to 10 battery cells. At this time, the battery cells included in the first battery assembly are electrically connected to adjacent battery cells. In a specific example, the first electrode of a battery cell is arranged to contact the second electrode of an adjacent battery cell so that the battery cells are electrically connected. For example, the first electrode of a battery cell may be connected to the second electrode of an adjacent battery cell by welding. Alternatively, the first electrode of a battery cell may be electrically connected to the second electrode of an adjacent battery cell by an adhesive member such as a tape.

[0059] In one embodiment, the first battery assembly includes a plurality of first receiving grooves, which are spaces where battery bodies of battery cells constituting the second battery assembly are disposed when the second battery assembly is stacked on the first battery assembly, and are spaces formed by electrically connecting adjacent battery cells.

[0060] In a specific example, the second electrode of the first arranged battery cell in the first battery assembly is arranged to contact the first electrode of the second arranged battery cell. At this time, one side surface of the battery body of the battery cell protrudes. Therefore, a groove is formed in an area where the battery body is not formed, that is, an area where the first electrode lead and the second electrode lead are formed and an area of ​​the first platform and the second platform. That is, a groove is formed between adjacent battery bodies in the first battery assembly. The second battery assembly also has such a structure. Here, in the first battery assembly, the groove becomes a first receiving groove, and in the second battery assembly, the groove becomes a second receiving groove.

[0061] In addition, when the second battery assembly is stacked on the upper surface of the first battery assembly, the battery body of the battery cell included in the second battery assembly is arranged on the first receiving groove, and the battery body of the battery cell included in the first battery assembly is arranged on the second receiving groove. In addition, when the second battery assembly is stacked on the upper surface of the first battery assembly, the battery body of the battery cell included in the first battery assembly and the battery body of the battery cell included in the second battery assembly are stacked to face each other. In addition, the second battery assembly may include 2 to 30, 2 to 20, 2 to 15 or 2 to 10 battery cells. In this case, the second battery assembly is stacked on one surface of the first battery assembly, and the battery body of the second battery assembly is accommodated in the first receiving groove of the first battery assembly. Here, the number of battery cells included in the second battery assembly may be 1 less than the number of battery cells included in the first battery assembly.

[0062] According to the present invention, space utilization can be improved by the structure of the battery module, and there is an advantage that a gap such as an air pocket can be ensured when gas is generated inside the battery cell of the battery assembly.

[0063] In one embodiment, the battery module according to the present invention includes an insulating pad and a cooling pad. Specifically, the insulating pad and the cooling pad are arranged between the first battery assembly and the second battery assembly. Specifically, the insulating pad and the cooling pad are arranged between the first receiving slot of the first battery assembly and the second receiving slot of the second battery assembly. Therefore, the insulating pad and the cooling pad are arranged between the first battery assembly and the second battery assembly, thereby directly cooling the battery cells.

[0064] The insulating pad is intended to prevent heat from being transferred between the battery cells of the first battery assembly and the second battery assembly, and may be a commonly used insulating pad. In addition, the cooling pad may be in the form of a tube containing insulating oil.

[0065] In a specific embodiment, in the first battery assembly, the first electrode lead of one battery cell is arranged to contact the second electrode lead of an adjacent battery cell. Thus, in the first battery assembly, adjacent battery cells are electrically connected to each other. In addition, on one surface of the first battery assembly, a first receiving groove may be formed in a space where the first electrode lead and the second electrode lead of the adjacent battery cells are connected.

[0066] In addition, the insulating pad can be arranged in the first receiving groove. In this case, the insulating pad can be arranged on the front surface of the first receiving groove, and can be arranged on the upper surfaces of the first platform and the second platform and the first electrode lead and the second electrode lead. In one embodiment, the insulating pad can be arranged in the first receiving groove and can be arranged on the upper surfaces of the first platform and the second platform.

[0067] The cooling pad may be disposed in the first receiving groove provided with the insulating pad, and the cooling pad may be disposed on the upper portion of the battery body of the battery cell included in the first battery assembly. Specifically, the cooling pad disposed on the upper surface of the battery body may directly cool the battery cell.

[0068] Next, after the insulating pad is provided on the upper surface of the battery body of the battery cell provided with the cooling pad, the second battery assembly can be stacked on the upper surface of the first battery assembly provided with the insulating pad and the cooling pad. In addition, the second battery assembly has a structure in which 7 battery cells are electrically connected and arranged on a single layer. In addition, as in the first battery assembly, in the second battery assembly, the first electrode lead of one battery cell is arranged to contact the second electrode lead of the battery cell adjacent thereto, so that the adjacent battery cells can be electrically connected. For example, the first battery assembly may include 8 battery cells, and the second battery assembly may include 7 battery cells. However, the present invention is not limited thereto.

[0069] Specifically, when the second battery assembly is stacked on top of the first battery assembly, the protruding areas of the battery cells are stacked to face each other. At this time, the protruding areas of the battery cells in the first battery assembly are arranged in the second receiving grooves of the second battery assembly, and the protruding areas of the battery cells in the second battery assembly are arranged in the first receiving grooves of the first battery assembly. By placing these first battery assemblies and second battery assemblies, the space utilization of the battery module can be improved.

[0070] In another example, the battery module according to the present invention includes m (m is an integer greater than 2) first battery assemblies arranged on the same layer, and includes n (n is an integer greater than 2) second battery assemblies arranged on the same layer. At this time, each first storage slot of the jth (j is an integer equal to or greater than 1 and equal to or less than n-1) first battery assembly and each first storage slot of the (j+1)th first battery assembly are arranged on the same axis. In addition, each second storage slot of the kth (k is an integer equal to or greater than 1 and equal to or less than m-1) second battery assembly and each second storage slot of the (k+1)th second battery assembly are arranged on the same axis. In addition, the number m of the first battery assemblies arranged on the same layer may be one of 2 to 10, 2 to 8, 2 to 6. For example, it may be 4. In addition, the number n of the second battery assemblies arranged on the same layer may be one of 2 to 10, 2 to 8, or 2 to 6. For example, it may be 4.

[0071] For example, the battery module according to the present invention includes four first battery assemblies arranged on the same layer. In this case, each first receiving slot of the first first battery assembly is arranged on the same axis as each first receiving slot of the second first battery assembly. In addition, the battery module according to the present invention includes four second battery assemblies arranged on the same layer. In this case, each second receiving slot of the first second battery assembly is arranged on the same axis as each second receiving slot of the second second battery assembly.

[0072] As described above, the battery body of the second battery assembly may be disposed on the first receiving groove of the first battery assembly, and the battery body of the first battery assembly may be disposed on the second receiving groove of the second battery assembly.

[0073] In yet another example, a battery module according to the present invention includes a first battery assembly and a second battery assembly. As described above, the battery bodies of the battery cells included in the first battery assembly and the second battery assembly are arranged on the same layer. Specifically, when the second battery assembly is stacked on the upper surface of the first battery assembly, the battery bodies of the battery cells included in the first battery assembly and the battery bodies of the battery cells included in the second battery assembly are stacked to face each other.

[0074] In addition, in the second battery assembly, an area opposite to the area where the battery cells protrude has a flat structure. That is, the other side surface of the second battery assembly has a flat structure.

[0075] In addition, the first battery assembly can be disposed again on the flat surface of the second battery assembly. That is, the first battery assembly and the second battery assembly are stacked in multiple layers.

[0076] According to the present invention, the space utilization rate can be improved by the structure of the battery module, and also there can be an advantage of ensuring a gap such as an air pocket when gas is generated inside the battery cell of the battery assembly.

[0077] In addition, the present invention provides a battery pack including the battery module.

[0078] Battery packs are applicable to various types of energy storage devices and power supplies. For example, energy storage devices are energy storage systems (ESS) that store a large amount of electrical energy. In addition, power supplies are applicable to power supplies for mobile devices such as automobiles. Automobiles refer to any type of vehicle that uses secondary batteries as its auxiliary power source or main power source. Specifically, automobiles include hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV) or pure electric vehicles (BEV, EV), etc.

[0079] Hereinafter, the present invention will be described in more detail by way of the accompanying drawings and examples. Since the inventive concept allows for various variations and numerous embodiments, specific embodiments will be shown in the accompanying drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, and all variations, equivalents and substitutes included in the spirit and scope of the present invention should be understood to be included.

[0080] (First embodiment)

[0081] Figure 3 is a schematic diagram of a battery module and a cross-sectional view (A-A') of the battery module according to an embodiment of the present invention, Figure 4 Schematically illustrates a battery assembly of a battery module according to an embodiment of the present invention. Figure 3 to Figure 4 A battery module of the present invention is described.

[0082] The battery module 100 according to the present invention includes: a tray 110 in which a battery cell storage portion is formed; a first battery assembly 130, which is accommodated in the battery cell storage portion of the tray 110 and is obtained by electrically connecting and arranging a plurality of battery cells 120 in a single layer; and a second battery assembly 140, which is accommodated in the battery cell storage portion of the tray 110 and is obtained by electrically connecting and arranging a plurality of battery cells 120 in a single layer.

[0083] At this time, the battery cell 120 includes a battery body 121, a first electrode lead 1221 and a second electrode lead 1222 protruding in two directions around the battery body 121, and includes a first platform 1211 and a second platform 1212 in areas where the first electrode lead 1211 and the second electrode lead 1211 are respectively connected to the battery body 121. In addition, a plurality of first receiving grooves 131 are formed on one surface of the first battery assembly 130, and the first receiving grooves 131 are formed in spaces where the first electrode leads 1221 and the second electrode leads 1222 of battery cells adjacent to each other are connected.

[0084] In addition, the battery body 121 of the battery cell 120 of the second battery assembly 140 is accommodated in each of the first receiving grooves 131 of the first battery assembly 130, and the battery body 121 of the battery cell 120 included in each of the first battery assembly 130 and the second battery assembly 140 is arranged on the same layer. In addition, the insulating pad 150 and the cooling pad 160 are arranged between the first battery assembly 130 and the second battery assembly 140.

[0085] Specifically, the battery module 100 according to the present invention includes a first battery assembly 130 and a second battery assembly 140 obtained by connecting a plurality of battery cells 120 on a single layer. In addition, the second battery assembly 140 is stacked on the upper surface of the first battery assembly 130. At this time, the battery cells 120 constituting the first battery assembly 130 and the battery cells 120 constituting the second battery assembly 140 are arranged alternately. This means that the battery bodies 121 of the battery cells 120 constituting the first battery assembly 130 and the battery bodies 121 of the battery cells 120 constituting the second battery assembly 140 are arranged alternately. As a result, the battery bodies 121 of the battery cells 120 included in the first battery assembly 130 and the second battery assembly 140 can be arranged on the same layer, and the space utilization of the battery module can be improved by the structure of the battery module 100.

[0086] The first battery assembly 130 according to the present invention has a structure in which eight battery cells 120 are electrically connected and arranged in a single layer. At this time, the battery cells 120 included in the first battery assembly 130 are electrically connected to adjacent battery cells 120. Specifically, the first electrode lead 1221 of one battery cell 120 is arranged to contact the second electrode lead 1222 of the adjacent battery cell 120, so that the adjacent battery cells 120 are electrically connected to each other. More specifically, the first electrode lead 1221 of one battery cell 120 is welded to the second electrode lead 1222 of the adjacent battery cell 120, thereby connecting to each other.

[0087] On the other hand, the first battery assembly 130 includes a plurality of first receiving grooves 131. The first receiving grooves 131 are spaces where the battery bodies 121 of the battery cells 120 constituting the second battery assembly 140 are arranged when the second battery assembly 140 is stacked on the first battery assembly, and are spaces formed by electrical connection of adjacent battery cells 120.

[0088] Specifically, the second electrode lead 1222 of the first arranged battery cell 120 in the first battery assembly 130 is arranged to contact the first electrode lead 1221 of the second arranged battery cell 120. At this time, one side surface of the battery body 121 of the battery cell 120 is protruding. As a result, a groove is formed in an area where the battery body 121 is not formed, that is, an area where the first electrode lead 1221 and the second electrode lead 1222 are formed and an area where the first platform 1211 and the second platform 1212 are formed. That is, a groove is formed between adjacent battery bodies 121 in the first battery assembly 130. The second battery assembly 140 also has such a structure. Here, in the first battery assembly 130, the groove becomes the first receiving groove 131, and in the second battery assembly 140, the groove becomes the second receiving groove 141.

[0089] Furthermore, when the second battery assembly 140 is stacked on the upper portion of the first battery assembly 130, the battery bodies 121 of the battery cells 120 included in the second battery assembly 140 are arranged in the first receiving grooves 131, and the battery bodies 121 of the battery cells 120 included in the first battery assembly 130 are arranged in the second receiving grooves 141. Furthermore, when the second battery assembly 140 is stacked on the upper portion of the first battery assembly 130, the battery bodies 121 of the battery cells 120 included in the first battery assembly 130 and the battery bodies 121 of the battery cells 120 included in the second battery assembly 140 are stacked to face each other.

[0090] According to the present invention, space utilization can be improved by the structure of the battery module 100. In addition, when gas is generated inside the battery cell 120 of the battery assembly 130 or 140, a gap such as an air pocket can be ensured.

[0091] The battery module 100 according to the present invention includes an insulating pad 150 and a cooling pad 160. Specifically, the insulating pad 150 and the cooling pad 160 are disposed between the first battery assembly 130 and the second battery assembly 140.

[0092] Specifically, the insulating pad 150 and the cooling pad 160 are disposed on the first receiving groove 131 of the first battery assembly 130 and the second receiving groove 141 of the second battery assembly 140. Therefore, the insulating pad 150 and the cooling pad 160 may be disposed between the first battery assembly 130 and the second battery assembly 140, thereby directly cooling the battery cells.

[0093] Through this structure, the heat generated in the battery cell 120 can be effectively released to the outside, and the life characteristics of the battery can be improved accordingly.

[0094] (Second embodiment)

[0095] Figure 5 1 is a diagram showing the configuration of a battery cell according to another embodiment of the present invention. Figure 5 A battery module of the present invention is described.

[0096] The battery module 200 according to the present invention includes: a tray 210 in which a battery cell storage portion is formed; a first battery assembly 230, which is accommodated in the battery cell storage portion of the tray 210 and is obtained by electrically connecting and arranging a plurality of battery cells 220 on a single layer; and a second battery assembly 240, which is accommodated in the battery cell storage portion of the tray 210 and is obtained by electrically connecting and arranging a plurality of battery cells 220 on a single layer.

[0097] At this time, the battery cell 220 includes a battery body 221, a first electrode lead 2221 and a second electrode lead 2222 protruding in two directions around the battery body 221, and includes a first platform 2211 and a second platform 2212 in areas where the first electrode lead 2221 and the second electrode lead 2222 are respectively connected to the battery body 221. The battery cell 220 may have a structure in which the first platform 2211 and the second platform 2212 are relatively widely formed on both sides of the battery cell 220 and smaller portions of the first electrode lead 2221 and the second electrode lead 2222 are respectively exposed by the first platform 2211 and the second platform 2212. The area of ​​each of the first platform 2211 and the second platform 2212 may correspond to about 10 times the area of ​​each of the exposed first and second electrode leads 2221 and 2222. In the battery cell 220, the exposure of the first electrode lead 2221 and the second electrode lead 2222 can be minimized by making the areas of the first electrode lead 2221 and the second electrode lead 2222 smaller than the areas of the first platform 2211 and the second platform 2212, thereby reducing the risk of short circuit in the battery cell 220. In addition, a buffer area when gas is generated in the battery body 211 can be ensured by making the areas of the first platform and the second platform larger.

[0098] A plurality of first receiving grooves 231 are formed on one surface of the first battery assembly 230 , and the first receiving grooves 231 are formed in spaces where the first electrode leads 2221 and the second electrode leads 2222 of battery cells adjacent to each other are connected.

[0099] In addition, the battery body 221 of the battery cell 220 of the second battery assembly 240 is accommodated in each first receiving groove 231 of the first battery assembly 230, and the battery body 221 of the battery cell 220 included in each of the first battery assembly 230 and the second battery assembly 240 is arranged on the same layer. In addition, the insulating pad 250 and the cooling pad 260 are arranged between the first battery assembly 230 and the second battery assembly 240.

[0100] In addition, in the battery cell 220, the length of the battery body 221 in the region where the first electrode lead 2221 and the second electrode lead 2222 protrude is greater than the length of the battery body 221 in the region where the first electrode lead 2221 and the second electrode lead 2221 do not protrude. That is, in the battery cell 220, the width W of the battery body 221 is greater than the length L of the battery body 221.

[0101] That is, when current flows from the first electrode lead 2221 to the second electrode lead 2222 of the battery cell 220, the distance along which the current flows decreases during the current flowing from the first electrode lead 2221 to the second electrode lead 2222. Therefore, the internal resistance of the battery cell 220 can be reduced.

[0102] In addition, the battery cell 220 has a structure protruding in the area where the battery body 221 is formed. Specifically, one side surface of the battery cell 220 has a structure protruding in the area where the battery body 221 is formed, and the other side surface of the battery cell 220 has a flat structure. Here, the flat structure means that the bottom of the battery cell 220 is flat, and the bottom surfaces of the first and second electrode leads 2221 and 2222 and the first and second platforms 2211 and 2212 are located on the same line as the bottom surface of the battery body 221.

[0103] In particular, when the second battery assembly 240 is stacked on top of the first battery assembly 230, the protruding areas of the battery cells 220 are stacked to face each other. At this time, the protruding areas of the first battery assembly 230 are arranged in the second receiving grooves 241 of the second battery assembly 240, and the protruding areas of the battery cells 220 in the second battery assembly 240 are arranged in the first receiving grooves 241 of the first battery assembly 230.

[0104] In addition, in the second battery assembly 240, the area opposite to the protruding area of ​​the battery unit 220 has a flat structure. That is, the other side surface of the second battery assembly 240 has a flat structure. Therefore, the battery module 200 of the present invention can improve space utilization.

[0105] On the other hand, each element regarding the battery module according to the present invention has been described above, and thus a detailed description of each element is omitted here.

[0106] (Third Embodiment)

[0107] 6A to 6F FIG. 1 is a diagram showing an assembly process of a battery module according to another embodiment of the present invention. 6A to 6F An assembling process of a battery module according to another embodiment of the present invention is described in detail.

[0108] First, the first battery assembly 330 is housed in a tray 310 formed with a battery cell storage portion. The first battery assembly 330 has a structure in which eight battery cells 320 are electrically connected and arranged in a single layer. At this time, the battery cells 320 included in the first battery assembly 330 are electrically connected to adjacent battery cells 320. Specifically, the first electrode lead 3221 of one battery cell 320 is arranged to contact the second electrode lead 3222 of the adjacent battery cell 320, so that the adjacent battery cells 320 can be electrically connected. In addition, a plurality of first storage grooves 331 ( Fig. 6A ), the first receiving groove 331 is formed in a space where the first electrode lead 3221 and the second electrode lead 3222 of the battery cells 320 adjacent to each other are connected.

[0109] Then, the insulating pad 350 is disposed on the first receiving groove 331. The insulating pad 350 is disposed on the front surface of the first receiving groove 341 and on the upper surfaces of the first platform 3211 and the second platform 3212 and the first electrode lead 3221 and the second electrode lead 3222 ( Figure 6B ).

[0110] The cooling pad 360 is disposed on the first receiving groove 341 provided with the insulating pad 350, and the cooling pad 360 is also disposed on the upper portion of the battery body 321 of the battery cell 320 included in the first battery assembly 330. In particular, the cooling pad 360 disposed on the upper surface of the battery body 321 can directly cool the battery cell 320 ( FIG. 6C to FIG. 6D ).

[0111] Thereafter, after the insulating pad 350 is disposed on the upper surface of the battery body 321 of the battery cell 320 provided with the cooling pad 360, the second battery assembly 340 is stacked on the upper surface of the first battery assembly 330 provided with the insulating pad 350 and the cooling pad 360. In addition, the second battery assembly 340 has a structure in which 7 battery cells 320 are electrically connected and arranged on a single layer. In the second battery assembly 340, the first electrode lead 3221 of one battery cell 320 is disposed to contact the second electrode lead 3222 of the battery cell 320 adjacent thereto, so that the adjacent battery cells 320 can be electrically connected, as in the first battery assembly 330. In addition, the drawings show that the first battery assembly 330 includes 8 battery cells 320 and the second battery assembly 340 includes 7 battery cells 320, but the present invention is not limited thereto.

[0112] Specifically, when the second battery assembly 340 is stacked on top of the first battery assembly 330, the protruding areas of the battery cells 320 are stacked to face each other. At this time, the protruding areas of the battery cells 320 in the first battery assembly 330 are arranged in the second receiving grooves 341 of the second battery assembly 340, and the protruding areas of the battery cells 320 in the second battery assembly 340 are arranged in the first receiving grooves 341 of the first battery assembly 330. By placing these first battery assemblies 330 and second battery assemblies 340, the space utilization rate of the battery module 300 can be improved ( FIG. 6E to FIG. 6F ).

[0113] Furthermore, the cooling pad 360 is arranged to be in contact with the battery body 321 of the battery cell 320 to directly cool the battery cell 320 .

[0114] On the other hand, each element regarding the battery module according to the present invention has been described above, and thus a detailed description of each element is omitted here.

[0115] (Fourth embodiment)

[0116] Figure 7 is a diagram schematically showing a battery module provided with an insulating pad during assembly of a battery module according to still another embodiment of the present invention.

[0117] refer to Figure 7 The battery module 400 according to the present invention accommodates the first battery assembly 430 in the tray 410 formed with the battery cell receiving portion. The first battery assembly 430 has a structure in which eight battery cells 420 are electrically connected and arranged on a single layer.

[0118] In addition, the insulating pad 450 is disposed on the first receiving groove 431 of the first battery assembly 430. The insulating pad 450 is disposed on the first receiving groove 431 and is disposed on the upper surfaces of the first platform 4211 and the second platform 4212. In addition, although not shown in the drawings, when the insulating pad 450 is disposed on the upper surface of the battery body 421 of the battery cell 420, the insulating pad may be disposed on the first platform and the second platform of the second battery assembly in the same manner.

[0119] Each element regarding the battery module according to the present invention has been described above, and thus a detailed description of each element is omitted here.

[0120] (Fifth Embodiment)

[0121] Figure 8 1 is a schematic diagram of a battery module according to another embodiment of the present invention and a cross-sectional view (AA') of the battery module.

[0122] refer to Figure 8 , a battery module 500 according to the present invention includes: a tray 510 in which a battery cell receiving portion is formed; a first battery assembly 530, which is accommodated in the battery cell receiving portion of the tray 510 and is obtained by electrically connecting and arranging a plurality of battery cells 520 on a single layer; and a second battery assembly 540, which is accommodated in the battery cell receiving portion of the tray 510 and is obtained by electrically connecting and arranging a plurality of battery cells 520 on a single layer.

[0123] At this time, the battery cell 520 includes a battery body 521, a first electrode lead 5221 and a second electrode lead 5222 protruding in two directions around the battery body 521, and includes a first platform 5211 and a second platform 5212 in areas where the first electrode lead 5221 and the second electrode lead 5221 are respectively connected to the battery body 521. In addition, a plurality of first receiving grooves 531 are formed on one surface of the first battery assembly 530, and the first receiving grooves 531 are formed in spaces where the first electrode leads 5221 and the second electrode leads 5222 of battery cells adjacent to each other are connected.

[0124] In addition, the battery body 521 of the battery cell 520 of the second battery assembly 540 is accommodated in each first receiving groove 531 of the first battery assembly 530, and the battery body 521 of the battery cell 120 included in each of the first battery assembly 530 and the second battery assembly 540 is arranged on the same layer. In addition, the insulating pad 550 and the cooling pad 560 are arranged between the first battery assembly 530 and the second battery assembly 540.

[0125] In particular, the battery module 500 according to the present invention includes m (m is an integer greater than or equal to 2) first battery assemblies 530 arranged on the same layer, and includes n (n is an integer greater than or equal to 2) second battery assemblies 540 arranged on the same layer. At this time, each first storage slot 531 of the j-th (j is an integer equal to or greater than 1 and equal to or less than n-1) first battery assembly 530 and each first storage slot 531 of the (j+1)-th first battery assembly 531 are arranged on the same axis. In addition, each second storage slot 541 of the k-th (k is an integer equal to or greater than 1 and equal to or less than m-1) second battery assembly 540 and each second storage slot 541 of the (k+1)-th second battery assembly 540 are arranged on the same axis.

[0126] Specifically, the battery module 500 according to the present invention includes four first battery assemblies 530 arranged on the same layer. At this time, each first receiving slot 531 of the first first battery assembly 530 is arranged on the same axis as each first receiving slot 531 of the second first battery assembly 530. In addition, the battery module 500 according to the present invention includes four second battery packs 540 arranged on the same layer. At this time, each second receiving slot 541 of the first second battery assembly 540 is arranged on the same axis as each second receiving slot 541 of the second second battery assembly 540.

[0127] Each element regarding the battery module according to the present invention has been described above, and thus a detailed description of each element is omitted here.

[0128] 9 is a diagram showing an assembly process of a battery module according to still another embodiment of the present invention. Hereinafter, an assembly process of a battery module according to still another embodiment of the present invention will be described in detail with reference to FIG.

[0129] First, the first battery assembly 530 is housed in a tray 510 formed with a battery cell receiving portion. The first battery assembly 530 has a structure in which eight battery cells 520 are electrically connected and arranged in a single layer. At this time, the battery cells 520 included in the first battery assembly 530 are electrically connected to adjacent battery cells 520. Specifically, the first electrode lead 5221 of one battery cell 520 is arranged to contact the second electrode lead 5222 of the adjacent battery cell 520, so that the adjacent battery cells 520 are electrically connected to each other. In addition, a plurality of first receiving grooves 531 ( Fig.9A ), the first receiving groove 531 is formed in a space where the first electrode lead 5221 and the second electrode lead 5222 of the battery cells 520 adjacent to each other are connected.

[0130] In addition, four first battery assemblies 530 are arranged on the same layer of the tray 510. At this time, the first receiving groove 531 formed on the first arranged first battery assembly 530 and the first receiving groove 531 formed on the second arranged first battery assembly 530 are arranged on the same axis ( Fig. 9B ).

[0131] Then, the insulating pad 550 is disposed on the first receiving groove 531. The insulating pad 550 is disposed on the front surface of the first receiving groove 531 and on the upper surfaces of the first platform 5211 and the second platform 5212 and the first electrode lead 5221 and the second electrode lead 5222 ( Fig. 9C ).

[0132] The cooling pad 560 is disposed on the first receiving groove 531 provided with the insulating pad 550, and the cooling pad 560 is also disposed on the upper portion of the battery body 521 of the battery cell 520 included in the first battery assembly 530. In particular, the cooling pad 560 disposed on the upper surface of the battery body 521 can directly cool the battery cell 520 ( FIG. 9D to FIG. 9E ).

[0133] Thereafter, after the insulating pad 550 is disposed on the upper surface of the battery body 521 of the battery cell 520 provided with the cooling pad 560, the second battery assembly 540 is stacked on the upper surface of the first battery assembly 530 provided with the insulating pad 550 and the cooling pad 560. In addition, the second battery assembly 540 has a structure in which 7 battery cells 520 are electrically connected and arranged on a single layer. In the second battery assembly 540, the first electrode lead 5221 of one battery cell 520 is disposed to contact the second electrode lead 5222 of the battery cell 520 adjacent thereto, so that the adjacent battery cells 520 can be electrically connected, as in the first battery assembly 530. In addition, the drawings show that the first battery assembly 530 includes 8 battery cells 520 and the second battery assembly 540 includes 7 battery cells 520, but the present invention is not limited thereto.

[0134] Specifically, when the second battery assembly 540 is stacked on top of the first battery assembly 530, the protruding areas of the battery cells 520 are stacked to face each other. At this time, the protruding areas of the battery cells 520 in the first battery assembly 530 are arranged in the second receiving grooves 541 of the second battery assembly 540, and the protruding areas of the battery cells 520 in the second battery assembly 540 are arranged in the first receiving grooves 541 of the first battery assembly 530. By placing these first battery assemblies 530 and second battery assemblies 540, the space utilization rate of the battery module 500 can be improved ( FIG. 9F to FIG. 9G ).

[0135] Furthermore, the cooling pad 560 is arranged to be in contact with the battery body 521 of the battery cell 520 to directly cool the battery cell 520 .

[0136] (Sixth Embodiment)

[0137] Fig.10 is a schematic diagram of a battery module according to yet another embodiment of the present invention.

[0138] refer to Fig.10 , a battery module 600 according to the present invention includes: a tray 610 in which a battery cell receiving portion is formed; a first battery assembly 630, which is accommodated in the battery cell receiving portion of the tray 610 and is obtained by electrically connecting and arranging a plurality of battery cells 620 on a single layer; and a second battery assembly 640, which is accommodated in the battery cell receiving portion of the tray 610 and is obtained by electrically connecting and arranging a plurality of battery cells 620 on a single layer.

[0139] At this time, the battery bodies 621 of the battery cells 620 included in the first battery assembly 630 and the second battery assembly 640 are arranged on the same layer. Specifically, when the second battery assembly 640 is stacked on the upper portion of the first battery assembly 630, the battery bodies 621 of the battery cells 620 included in the first battery assembly 630 and the battery bodies 621 of the battery cells 620 included in the second battery assembly 640 are stacked to face each other.

[0140] In addition, in the second battery assembly 640, an area opposite to the area where the battery unit 620 protrudes has a flat structure. That is, the other side surface of the second battery assembly 640 has a flat structure.

[0141] In addition, the first battery assembly 630 may be disposed again on the flat surface of the second battery assembly 640. That is, the first battery assembly 630 and the second battery assembly 640 are stacked in a plurality of layers.

[0142] According to the present invention, space utilization can be improved by the structure of the battery module 600. In addition, there is an advantage that a gap such as an air pocket can be ensured when gas is generated inside the battery cell 620 of the battery assembly 630 or 640.

[0143] Each element regarding the battery module according to the present invention has been described above, and thus a detailed description of each element is omitted here.

[0144] The present invention has been described in more detail above through the drawings and embodiments. Therefore, the embodiments described in the specification and the configurations described in the drawings are only the most preferred embodiments of the present invention and do not represent the entire technical concept of the present invention. It should be understood that various equivalents and modifications may be substituted for them when submitting this application.

[0145] [Explanation of Reference Numerals]

[0146] 100, 200, 300, 400, 500, 600: battery module

[0147] 110, 210, 310, 410, 510, 610: Pallet

[0148] 120, 220, 320, 420, 520, 620: Battery cells

[0149] 121, 221, 321, 421, 521, 621: Battery body

[0150] 1211, 2211, 3211, 4211, 5211: First platform

[0151] 1212, 2212, 3212, 4212, 5212: Second platform

[0152] 1221, 2221, 3221, 5221: first electrode lead

[0153] 1222, 2222, 3222, 5222: Second electrode lead

[0154] 130, 230, 330, 430, 530, 630: First battery assembly

[0155] 131, 231, 331, 431, 531: First storage slot

[0156] 140, 240, 340, 540, 640: Second battery assembly

[0157] 141, 241, 341, 541: Second storage slot

[0158] 150, 250, 350, 450, 550: Insulation pad

[0159] 160, 260, 360, 560: Cooling pad

Claims

1. A battery module, comprising: a tray having a battery unit storage portion formed therein; a first battery assembly which is accommodated in the battery cell receiving portion of the tray and is obtained by electrically connecting a plurality of battery cells and arranging them in a single layer; as well as a second battery assembly which is accommodated in the battery cell receiving portion of the tray and is obtained by electrically connecting a plurality of battery cells and arranging them in a single layer, The battery cell includes a battery body, a first electrode lead and a second electrode lead protruding in two directions around the battery body, and includes a first platform and a second platform, the first platform and the second platform are in areas where the first electrode lead and the second electrode lead are respectively connected to the battery body, A plurality of first receiving grooves are formed on one surface of the first battery assembly, and the plurality of first receiving grooves are formed in spaces where the first electrode leads and the second electrode leads of the battery cells adjacent to each other are connected. wherein the battery bodies of the battery cells of the second battery assembly are accommodated in the respective first receiving grooves of the first battery assembly, and the battery bodies of the battery cells included in each of the first battery assembly and the second battery assembly are arranged on the same layer, Wherein, an insulating pad and a cooling pad are arranged between the first battery assembly and the second battery assembly, The area of ​​each of the first platform and the second platform is 5 to 20 times the area of ​​the exposed first electrode lead and the exposed second electrode lead, wherein one side surface of the battery cell has a structure protruding in a region where the battery body is formed, and the other side surface of the battery cell has a flat structure, Wherein, the insulating pad is arranged between the first battery assembly and the second battery assembly, wherein the insulating pad is arranged on an area in contact with the first platform and the second platform of the battery cell included in the first battery assembly and the second battery assembly, or is arranged on an area in contact with the first platform and the second platform and the first electrode lead and the second electrode lead, and The cooling pad is disposed between the first battery assembly and the second battery assembly, and the cooling pad is disposed on an area in contact with battery bodies of battery cells included in the first battery assembly and the second battery assembly.

2. The battery module according to claim 1, wherein: A plurality of second receiving grooves are formed on one surface of the second battery assembly, the plurality of second receiving grooves being formed in spaces where the first electrode leads and the second electrode leads of battery cells adjacent to each other are connected, and Wherein, the battery body of the battery unit of the first battery assembly is accommodated in each of the second receiving grooves of the second battery assembly.

3. The battery module according to claim 1, wherein: A length of the battery main body in a region where the first electrode lead and the second electrode lead protrude is greater than a length of the battery main body in a region where the first electrode lead and the second electrode lead do not protrude.

4. The battery module according to claim 1, wherein: The battery module includes m first battery assemblies arranged on the same layer, Wherein, m is an integer greater than 2, The first receiving slot of the jth first battery assembly and the first receiving slot of the (j+1)th first battery assembly are arranged on the same axis, and Here, j is an integer equal to or greater than 1 and equal to or less than (n-1).

5. The battery module according to claim 1, wherein: The battery module includes n second battery assemblies arranged on the same layer, Where n is an integer greater than 2, The second receiving slot of the kth second battery assembly and the second receiving slot of the (k+1)th second battery assembly are arranged on the same axis, and Here, k is an integer equal to or greater than 1 and equal to or less than (m-1).

6. The battery module according to claim 1, wherein: Each of the first battery assembly and the second battery assembly has a structure in which a plurality of battery cells are electrically connected in series to each other.

7. The battery module according to claim 1, wherein: The battery bodies of the battery cells included in the first battery assembly and the second battery assembly are arranged on the same layer, and Wherein, the first battery assembly and the second battery assembly are stacked into multiple layers. A battery pack comprising the battery module according to claim 1 .

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