Battery pack

Abstract

According to an exemplary embodiment, a battery pack is provided, the battery pack including: a base plate; a first battery cell assembly disposed on a mounting surface of the base plate; a second battery cell assembly; and a cross beam interposed between the first battery cell assembly and the second battery cell assembly, wherein first and second sides of the cross beam are oblique to the mounting surface of the base plate, the first side of the cross beam facing the first battery cell assembly, and the second side of the cross beam facing the second battery cell assembly.

Description

[Technical Field]

[0001] The present invention relates to a battery pack. This application claims the benefit of Korean Application No. 10-2023-0088283, filed on July 7, 2023, which is incorporated herein by reference in its entirety. [Background technology]

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for a variety of wireless devices, such as handsets, laptops, and wireless vacuum cleaners. In recent years, improvements in energy density and economies of scale have dramatically reduced the manufacturing cost per unit capacity of secondary batteries. As the driving range of battery electric vehicles (BEVs) has increased to the same level as fuel-powered vehicles, the primary use of secondary batteries has shifted from mobile devices to mobility.

[0003] To meet the rapidly expanding demand for secondary batteries for mobility, cell manufacturers are enduring huge capital expenditures. Secondary batteries that are more efficient in the secondary battery manufacturing process and easier to assemble can increase the production capacity per production line. As a result, various research efforts are being conducted to improve the efficiency of secondary battery manufacturing processes and the ease of assembly of battery packs. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the technical idea of ​​the present invention is to provide a battery pack with improved productivity. [Means for solving the problem]

[0005] According to an exemplary embodiment of the present invention to solve the above-mentioned problems, there is provided a battery pack including: a base plate; a first battery cell assembly disposed on a mounting surface of the base plate, the first battery cell assembly including a plurality of first battery cells and a first side beam coupled to the plurality of first battery cells; a second battery cell assembly disposed on the mounting surface of the base plate, the second battery cell assembly including a plurality of second battery cells and a second side beam coupled to the plurality of second battery cells; and a cross beam interposed between the first battery cell assembly and the second battery cell assembly, wherein a first side and a second side of the cross beam are oblique to the mounting surface of the base plate, and the first side of the cross beam faces the first battery cell assembly and the second side of the cross beam faces the second battery cell assembly.

[0006] The first side beam includes a first inclined surface facing the first side surface of the cross beam, and the second side beam includes a second inclined surface facing the first side surface of the cross beam.

[0007] The first side beam is parallel to the mounting surface of the base plate and includes a first horizontal surface connected to the first inclined surface, and the second side beam is parallel to the mounting surface of the base plate and includes a second horizontal surface connected to the second inclined surface.

[0008] The first side beam is perpendicular to the mounting surface of the base plate and includes a first vertical surface connected to the first horizontal surface, and the second side beam is perpendicular to the mounting surface of the base plate and includes a second vertical surface connected to the second horizontal surface.

[0009] The first and second horizontal surfaces overlap with the upper surface of the cross beam, the upper surface of the cross beam is connected to the first and second side surfaces, and the first and second vertical surfaces face each other.

[0010] The cross beam includes a lower surface that contacts the mounting surface of the base plate, and the first and second side surfaces of the cross beam are each connected to the lower surface of the cross beam.

[0011] The length of the upper surface of the cross beam in the first direction is different from the length of the lower surface of the cross beam in the first direction, and the first direction is parallel to the mounting surface of the base plate.

[0012] The length of the upper surface of the cross beam in the first direction is shorter than the length of the lower surface of the cross beam in the first direction.

[0013] The first side surface and the second side surface are spaced apart from each other in a first direction parallel to the mounting surface of the base plate, and the first battery cells are arranged along the first direction.

[0014] The cross-section of the cross beam is trapezoidal.

[0015] To solve the above-mentioned problems, an exemplary embodiment of the present invention provides a battery pack including a base plate, a plurality of battery cell assemblies arranged on a mounting surface of the base plate, each of the plurality of battery cell assemblies including a plurality of first battery cells, a first side beam, and a second side beam, and a cross beam interposed between the plurality of battery cell assemblies, each of the cross beams having a trapezoidal cross section.

[0016] Each of the cross beams includes a lower surface that contacts the mounting surface of the base plate, and each of the first and second sides of the cross beams is oblique to the mounting surface of the base plate and is connected to the lower surface of the cross beam.

[0017] The length of the upper surface of the cross beam in a first direction is different from the length of the lower surface of the cross beam in the first direction, and the first direction is parallel to the mounting surface of the base plate.

[0018] The length of the upper surface of the cross beam in the first direction is shorter than the length of the lower surface of the cross beam in the first direction. [Effects of the Invention]

[0019] A battery pack according to an exemplary embodiment of the present invention includes a cross beam disposed on a housing and including an inclined surface, and a battery cell assembly including side beams having a shape complementary to the cross beam, thereby improving the assemblability of the battery cell assembly and allowing the battery cell assembly to be easily disassembled even when swelling occurs in a battery cell.

[0020] The effects that can be obtained from the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood from the following description by a person having ordinary skill in the art to which the exemplary embodiments of the present disclosure belong. In other words, unintended effects accompanying the implementation of the exemplary embodiments of the present disclosure can also be derived from the exemplary embodiments of the present disclosure by a person having ordinary skill in the art. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a top view of a battery pack according to an exemplary embodiment. [Figure 2]1A is a cross-sectional view taken along section line 1I-1I' of FIG. 1 according to an exemplary embodiment. [Figure 3] FIG. 1 is a top view of a battery pack according to an exemplary embodiment. [Figure 4] 3A is a cross-sectional view taken along section line 3I-3I' of FIG. 3 according to an exemplary embodiment. [Figure 5] FIG. 1 is a top view of a battery pack according to an exemplary embodiment. [Figure 6] 5A is a cross-sectional view taken along section line 5I-5I' of FIG. 5 according to an exemplary embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that an inventor can appropriately define the concepts of terms to best describe his or her own invention.

[0023] Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and there may be various equivalents and modifications that can replace them at the time of this application.

[0024] Furthermore, in the description of the present invention, if it is determined that a detailed description of related publicly known structures or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0025] Since the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown in a schematic manner for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0026] (First embodiment) 1 is a top view of a battery pack 100 according to an exemplary embodiment. In FIG. 1, the lead plate 140 is omitted.

[0027] FIG. 2 is a cross-sectional view taken along the line 1I-1I' in FIG.

[0028] Referring to FIGS. 1 and 2, a battery pack 100 may include a housing 110, a plurality of battery cell assemblies 120, a center beam 131, cross beams 133, and lead plates 140.

[0029] The housing 110 may provide a space for mounting a plurality of battery cell assemblies 120. The housing 110 may include a base plate 111 and side walls 112, 113, 114, and 115.

[0030] Two directions substantially parallel to the mounting surface 111U of the base plate 111 are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surface 111U of the base plate 111 is defined as the Z direction. The X direction, Y direction, and Z direction may be substantially perpendicular to each other. Unless otherwise specified, the definitions of the directions are the same for the following drawings.

[0031] The base plate may include multiple plates friction stir welded together. The base plate may include multiple cooling channels, multiple cavities, and ribs. Each of the cooling channels, multiple cavities, and ribs may extend in the X direction. The cooling channels may provide paths for a cooling fluid to flow. The cooling channels may be spaced apart in the Y direction. The cooling channels may be arranged along the Y direction. The multiple cavities are empty spaces formed inside the base plate 111. The formation of the cavities may reduce the mass of the base plate 111, thereby improving the energy density of the battery pack 100. The ribs may define the multiple cooling channels and the multiple cavities. The ribs may surround the multiple cooling channels and the multiple cavities. The ribs may maintain the multiple cooling channels and the multiple cavities airtight.

[0032] The side walls 112, 113, 114, 115 may be coupled to the base plate 111. The side walls 112, 113, 114, 115 may be coupled to the base plate 111 by, for example, friction stir welding.

[0033] The sidewalls 112, 113 may be substantially perpendicular to the X direction. The sidewalls 112, 113 may be spaced apart from each other in the X direction. The sidewalls 114, 115 may be substantially perpendicular to the Y direction. The sidewalls 114, 115 may be spaced apart from each other in the Y direction.

[0034] The plurality of battery cell assemblies 120 may be disposed on a base plate 111 of the housing 110. The base plate 111 may support the plurality of battery cell assemblies 120. The side walls 112, 113, 114, and 115 may horizontally surround the plurality of battery cell assemblies 120. The side walls 112, 113, 114, and 115 may protect the plurality of battery cell assemblies 120.

[0035] In one example, the battery pack 100 may be of a moduleless type, and each of the plurality of battery cell assemblies 120 may not include a module frame. In another example, the battery pack 100 may be of a modular type, and each of the plurality of battery cell assemblies 120 may include a module frame.

[0036] Each of the plurality of battery cell assemblies 120 may include a plurality of battery cells 121 and side beams 125A and 125B. The side beams 125A and 125B may be coupled to the battery cells 121.

[0037] The plurality of battery cells 121 are basic units of a lithium ion battery, i.e., a secondary battery. Each of the plurality of battery cells 121 includes an electrode assembly, an electrolyte, a case, and an electrode lead. Each of the plurality of battery cells 121 may be any one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of a cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of a prismatic battery cell is housed in a prismatic metal can. The electrode assembly of a pouch-type battery cell is housed in a pouch case including an aluminum laminate sheet.

[0038] The electrode assembly may include a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. The electrode assembly may be either a jelly roll type or a stack type. A jelly roll type electrode assembly may include a rolled structure of a positive electrode, a negative electrode, and a separator interposed therebetween. A stack type electrode assembly may include a plurality of sequentially stacked positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed therebetween.

[0039] The electrode lead may be connected to one of the positive electrode tabs of the plurality of positive electrodes and the negative electrode tabs of the plurality of negative electrodes. The electrode lead may be welded to one of the positive electrode tabs and the negative electrode tabs. The electrode lead may be an external connection terminal for each of the plurality of battery cells 121.

[0040] The plurality of battery cells 121 may be connected in series to form a plurality of banks. Each of the plurality of banks may include one or more battery cells 121 connected in parallel. Each of the plurality of banks may include one or more battery cells connected in parallel. The number of series-connected banks and the number of parallel-connected battery cells may be determined depending on the magnitude of voltage and current to be output from the stack of the plurality of battery cell assemblies 120.

[0041] Each of the plurality of battery cells may further include a lead cover assembly. The lead cover assembly may include a lead cover frame and an integrated circuit. The lead cover frame may include an insulating material such as plastic. The lead cover frame may cover the electrode leads of the plurality of battery cells 121. In this way, the lead cover frame may prevent undesired short circuits between the electrode leads of the plurality of battery cells 121 and external elements.

[0042] The plurality of battery cells 121 may be arranged in the Y direction, so that electrode leads of the plurality of battery cells 121 may be aligned. Separators may be interposed between the plurality of battery cells 121. The separators may be PU (Poly Urethane) pads for preventing swelling of the plurality of battery cells 121, or separators for thermally isolating the plurality of battery cells 121.

[0043] The side beams 125A, 125B may be spaced apart from each other with the plurality of battery cells 121 therebetween. The side beams 125A, 125B may be spaced apart in the Y direction. The plurality of battery cells 121 may be interposed between the side beams 125A, 125B. The side beams 125A, 125B may be fixed to the plurality of battery cells 121 by, but are not limited to, an adhesive.

[0044] Each of the side beams 125A, 125B may include a bonding surface 125CS and an assembly surface 125AS. The bonding surface 125CS and the assembly surface 125AS may be opposite to each other. The bonding surface 125CS may face the inside of the battery cell assembly 120, and the assembly surface 125AS may face the outside of the battery cell assembly 120.

[0045] The coupling surfaces 125CS of the side beams 125A and 125B may face the plurality of battery cells 121. The coupling surfaces 125CS of the side beams 125A and 125B may come into contact with any one of the plurality of battery cells 121.

[0046] The assembly surface 125AS of each of the side beams 125A, 125B can face a corresponding one of the cross beams 133. The assembly surface 125AS of each of the side beams 125A of the plurality of battery cells 121 can face the assembly surface 125AS of the side beam 125B of an adjacent one of the plurality of battery cells 121.

[0047] The assembly surface 125AS of each of the side beams 125A, 125B may include an inclined surface 125S, a horizontal surface 125H, and a vertical surface 125V. The inclined surface 125S may be oblique to the mounting surface 111U of the base plate 111. The horizontal surface 125H may be substantially parallel to the mounting surface 111U of the base plate 111. The horizontal surface 125H may be coupled to the inclined surface 125S. The vertical surface 125V may be substantially perpendicular to the mounting surface 111U of the base plate 111. The vertical surface 125V may be coupled to the horizontal surface 125H of the base plate 111.

[0048] The inclined surface 125S can face the side surface 113S1 or the side surface 113S2 of the corresponding one of the cross beams 133. The horizontal surface 125H can face the top surface 133U of the corresponding one of the cross beams 133. The vertical surface 125V of the side beam 125A of each of the plurality of battery cells 121 can face the vertical surface 125V of the side beam 125B of an adjacent one of the plurality of battery cells 121.

[0049] The inclined surface 125S can be in contact with the side surface 113S1 or the side surface 113S2 of the corresponding one of the cross beams 133. The horizontal surface 125H can be in contact with the top surface 133U of the corresponding one of the cross beams 133. The vertical surface 125V of the side beam 125A of each of the plurality of battery cells 121 can be in contact with the vertical surface 125V of the side beam 125B of an adjacent one of the plurality of battery cells 121.

[0050] The plurality of battery cell assemblies 120 may be arranged in the X direction and the Y direction. In FIG. 1 , the number of the plurality of battery cell assemblies 120 arranged in the X direction is three, and the number of the plurality of battery cell assemblies 120 arranged in the Y direction is two. Therefore, such an arrangement of the plurality of battery cell assemblies 120 can be said to be a 3*2 arrangement. Based on what is described herein, a person of ordinary skill in the art can easily arrive at an arrangement of M*N battery cell assemblies 120 (where M and N are each an integer of two or more).

[0051] The center beam 131 may be disposed on the base plate 111. The center beam 131 may extend in the X direction. The center beam 131 may be coupled to the base plate 111. The center beam 131 may be welded to the base plate 111. Alternatively, the center beam may be integrally formed with the base plate by an extrusion process, in which case the center beam may be included in the base plate.

[0052] The center beam 131 may be interposed between the plurality of battery cell assemblies 120. The center beam 131 may separate the plurality of battery cell assemblies 120 in the Y direction. The plurality of battery cell assemblies 120 may be spaced apart in the Y direction with the center beam 131 therebetween.

[0053] The cross beam 133 may be disposed on the base plate 111. The cross beam 133 may extend in the Y direction. The cross beam 133 may be coupled to the base plate 111. The cross beam 133 may be welded to the base plate 111.

[0054] The cross beams 133 may be interposed between the plurality of battery cell assemblies 120, may separate the plurality of battery cell assemblies 120 from the electrical component mounting region EMR, or may be interposed between the sidewall 115 and the plurality of battery cell assemblies 120. The cross beams 133 may separate the plurality of battery cell assemblies 120 in the X direction. The plurality of battery cell assemblies 120 may be spaced apart in the X direction with the cross beams 133 interposed therebetween.

[0055] Each of the cross beams 133 may include side surfaces 133S1 and 133S2, a lower surface 133L, and an upper surface 133U. The lower surface 133L may be in contact with the mounting surface 111U of the base plate 111. The side surfaces 133S1 and 133S2 may be connected to the lower surface 133L. The upper surface 133U may be spaced apart from the lower surface 133L in the Z direction. The upper surface 133U may be connected to the side surfaces 133S1 and 133S2.

[0056] The cross-sectional shape of each of the cross beams 133 may be trapezoidal. The lower surface 133L and the upper surface 133U may be substantially parallel to the mounting surface 111U of the base plate 111. The side surfaces 133S1 and 133S2 may be oblique to the mounting surface 111U of the base plate 111. The length of the upper surface 133U in the X direction may be different from the length of the lower surface 133L in the X direction. The length of the upper surface 133U in the X direction may be even shorter than the length of the lower surface 133L in the X direction.

[0057] According to an exemplary embodiment, the side beams 125A, 125B may have a shape complementary to the cross beam 133. According to an exemplary embodiment, the side beams 125A, 125B may be coupled to the cross beam 133. In this way, the side beams 125A, 125B and the cross beam 133 may form a cross beam assembly that isolates adjacent battery cell assemblies 120.

[0058] According to the exemplary embodiment, the inclination of each of the side surfaces 133S1 and 133S2 of the cross beam 133 and the inclined surfaces 125S of the side beams 125A and 125B can improve the ease of assembly of the battery cell assembly 120. According to the exemplary embodiment, the inclination of each of the side surfaces 133S1 and 133S2 of the cross beam 133 and the inclined surfaces 125S of the side beams 125A and 125B can facilitate disassembly of the battery cell assembly 120 from the battery pack 100 even when swelling occurs in the battery cells 121 during use of the battery pack 100.

[0059] 1 is a non-limiting example and does not limit the technical concept of the present invention in any way. Based on what is described herein, a person skilled in the art can easily arrive at a battery pack including a variety of arrangements and numbers of center beams, cross beams, and battery cell assemblies.

[0060] The lead plate 140 may be coupled to the side walls 112, 113, 114, and 115. The lead plate 140 may cover elements mounted inside the battery pack 100, such as the battery cell assembly 120 and electrical components. The lead plate 140 may be fixed to the side walls 112, 113, 114, and 115 by mechanical coupling means, such as fasteners.

[0061] The battery pack 100 may further include exhaust devices. The exhaust devices may be coupled to, for example, the sidewalls 112. The sidewalls 112 may include exhaust holes, and the exhaust devices may be coupled to the exhaust holes of the sidewalls 112. Each of the exhaust devices may include a spring type or a rupture disk. Each of the exhaust devices may be configured to exhaust gas inside the battery pack 100 when the pressure inside the battery pack 100 exceeds a threshold value.

[0062] The exhaust device may be configured to slow down thermal propagation by releasing high-temperature gases inside the battery pack 100 to the outside when at least one of the plurality of battery cell assemblies 120 is in a thermal runway state.

[0063] Here, thermal runaway of the battery cell assemblies 120 is a state in which a temperature change in the battery cell assemblies 120 further accelerates the temperature change, which is an uncontrollable positive feedback. The battery cell assemblies 120 in a thermal runaway state exhibit a rapid temperature rise and emit a large amount of high-pressure gas and combustion debris.

[0064] The battery pack 100 may further include electrical components. The electrical components may be mounted on an electrical component mounting region EMR of the housing 110. The electrical components may include any electronic elements necessary to operate the battery pack.

[0065] The electrical components may include, for example, a BMS (Battery Management System). The BMS may be configured to monitor, balance, and control the battery pack. Monitoring the battery pack 100 may include measuring the voltage and current of specific nodes within the multiple battery cell assemblies 120 and measuring the temperature at a set position within the battery pack 100. The battery pack 100 may include measuring instruments for measuring the voltage, current, and temperature described above.

[0066] Balancing the battery pack 100 is an operation to reduce the deviation between the multiple battery cell assemblies 120. Controlling the battery pack 100 includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack 100 can operate under optimal conditions, thereby preventing a shortening of the lifespan of each of the multiple battery cell assemblies 120.

[0067] The electrical components may further include a cooling device, a power relay assembly (PRA), a safety plug, etc. The cooling device may include a cooling fan. The cooling fan circulates air inside the battery pack 100 to prevent overheating of each of the plurality of battery cell assemblies 120. The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA can protect the plurality of battery cell assemblies 120 and the external load (e.g., a vehicle motor) by cutting off the power supply to the external load (e.g., a vehicle motor) in the event of an abnormal voltage such as a voltage surge.

[0068] The battery pack 100 may further include a plurality of bus bars configured to electrically connect the plurality of battery cell assemblies 120. The plurality of battery cell assemblies 120 may be connected in series by the plurality of bus bars. This allows the battery pack 100 to be configured to output a high voltage to an external load (e.g., a vehicle motor).

[0069] (Second embodiment) 3 is a top view of the battery pack 101 according to an exemplary embodiment. In FIG. 3, the lead plate 140 is omitted.

[0070] FIG. 4 is a cross-sectional view taken along section line 3I-3I' in FIG.

[0071] Referring to FIGS. 3 and 4, the battery pack 101 may include a housing 110, a plurality of battery cell assemblies 120, a center beam 131, a cross beam 133, cross beams 134 and 135, and a lead plate 140.

[0072] The housing 110, the plurality of battery cell assemblies 120, the center beam 131, the cross beam 133, and the lead plate 140 are substantially the same as those described with reference to Figures 1 and 2, so a duplicate description thereof will be omitted.

[0073] The cross beams 134, 135 can be spaced apart with the cross beam 133 therebetween. The cross beam 133 can be interposed between the cross beams 134, 135. The cross beam 134 can be adjacent to the side wall 114. The cross beam 135 can be adjacent to the side wall 115. The cross beam 135 can be in contact with the side wall 115.

[0074] According to an exemplary embodiment, cross beam 134 may include only one inclined surface 134S, and cross beam 135 may include only one inclined surface 135S. The X-direction length of each of cross beams 134, 135 may be different from the X-direction length of each of cross beams 133. The X-direction length of each of cross beams 134, 135 may be even shorter than the X-direction length of each of cross beams 133.

[0075] According to an exemplary embodiment, cross beam 135 may be coupled to side beam 125A, and cross beam 134 may be coupled to side beam 125B, thereby reducing the overall length of battery pack 101 and improving the energy density of battery pack 101.

[0076] (Third embodiment) 5 is a top view of the battery pack 102 according to an exemplary embodiment. In FIG. 5, the lead plate 140 is omitted.

[0077] FIG. 6 is a cross-sectional view taken along section line 5I-5I' of FIG.

[0078] Referring to FIGS. 5 and 6, the battery pack 102 may include a housing 110, a plurality of battery cell assemblies 120, a center beam 131, cross beams 133, and lead plates 140.

[0079] The housing 110, the plurality of battery cell assemblies 120, the center beam 131, the cross beam 133, and the lead plate 140 are substantially the same as those described with reference to Figures 1 and 2, so a duplicate description thereof will be omitted.

[0080] The cross beams 133 may be interposed only between the plurality of battery cell assemblies 120. Thus, the number of cross beams 133 may be smaller than the number of cross beams 133. For example, if the battery pack includes 2N (N is an integer greater than or equal to 2) battery cell assemblies 120, the battery pack may include 2N-2 cross beams 133. Thus, the overall length and mass of the battery pack 102 may be reduced, and the energy density of the battery pack 102 may be improved.

[0081] The present invention has been described in more detail above through the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore, there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0082] 1I-1I' cutting line 3I-3I' cutting line 5I-5I' cutting line 100 battery packs 101 Battery Pack 102 Battery Pack 110 Housing 111 Base Plate 111U mounting surface 112, 113, 114, 115 side wall 112, 113 side wall 112 Side wall 113 Side wall 113S1 Side 113S2 side 114, 115 side wall 114 Side wall 115 Side wall 120 Battery Cell Assembly 121 battery cells 125A, 125B side beam 125A Side Beam 125AS assembly surface 125B side beam 125CS bonding surface 125H Horizontal surface 125S Slope 125V vertical surface 131 Center beam 133 Cross Beam 133L bottom surface 133S1, 133S2 side 133S1 Side 133S2 side 133U top 134, 135 Cross beam 134 Cross Beam 135 Cross Beam 140 Reed Plate EMR implementation area

Claims

1. Base plate, a first battery cell assembly disposed on the mounting surface of the base plate, the first battery cell assembly including a plurality of first battery cells and a first side beam coupled to the plurality of first battery cells; a second battery cell assembly disposed on the mounting surface of the base plate, the second battery cell assembly including a plurality of second battery cells and a second side beam coupled to the plurality of second battery cells; and a cross beam interposed between the first battery cell assembly and the second battery cell assembly; Including, a first side and a second side of the cross beam that are oblique to the mounting surface of the base plate, the first side of the cross beam facing the first battery cell assembly, and the second side of the cross beam facing the second battery cell assembly.

2. the first side beam includes a first inclined surface facing the first side surface of the cross beam; The battery pack according to claim 1 , wherein the second side beam includes a second inclined surface facing the first side surface of the cross beam.

3. the first side beam is parallel to the mounting surface of the base plate and includes a first horizontal surface connected to the first inclined surface; The battery pack according to claim 2 , wherein the second side beam includes a second horizontal surface that is parallel to the mounting surface of the base plate and is connected to the second inclined surface.

4. the first side beam is perpendicular to the mounting surface of the base plate and includes a first vertical surface connected to the first horizontal surface; The battery pack according to claim 3 , wherein the second side beam includes a second vertical surface that is perpendicular to the mounting surface of the base plate and connected to the second horizontal surface.

5. The first horizontal plane and the second horizontal plane each overlap an upper surface of the cross beam, and the upper surface of the cross beam is connected to the first side surface and the second side surface; The battery pack according to claim 4 , wherein the first vertical surface and the second vertical surface face each other.

6. the cross beam includes a lower surface that contacts the mounting surface of the base plate; The battery pack according to claim 5 , wherein each of the first side and the second side of the cross beam is coupled to the lower surface of the cross beam.

7. a length in a first direction of the upper surface of the cross beam is different from a length in the first direction of the lower surface of the cross beam; The battery pack according to claim 6 , wherein the first direction is parallel to the mounting surface of the base plate.

8. The battery pack of claim 7 , wherein a length of the upper surface of the cross beam in the first direction is shorter than a length of the lower surface of the cross beam in the first direction.

9. the first side surface and the second side surface are spaced apart from each other in a first direction parallel to the mounting surface of the base plate; The battery pack according to claim 1 , wherein the plurality of first battery cells are arranged along the first direction.

10. The battery pack according to claim 1 , wherein the cross beam has a trapezoidal cross-sectional shape.

11. Base plate, a plurality of battery cell assemblies disposed on the mounting surface of the base plate, each of the plurality of battery cell assemblies including a plurality of first battery cells, a first side beam, and a second side beam; and a cross beam interposed between the plurality of battery cell assemblies; Including, The cross-sectional shape of each of the cross beams is trapezoidal.

12. each of the cross beams including a lower surface that contacts the mounting surface of the base plate; The battery pack of claim 11 , wherein each of the first and second sides of the cross beams is oblique to the mounting surface of the base plate and is coupled to the lower surface of the cross beam.

13. a length in a first direction of an upper surface of the cross beam is different from a length in the first direction of the lower surface of the cross beam; The battery pack according to claim 12 , wherein the first direction is parallel to the mounting surface of the base plate.

14. The battery pack of claim 13 , wherein a length of the upper surface of the cross beam in the first direction is shorter than a length of the lower surface of the cross beam in the first direction.

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