Battery pack

Abstract

Exemplary embodiments provide a battery pack. The battery pack includes: a base plate; a first battery cell assembly and a second battery cell assembly on the mounting surface of the base plate; and a cross beam located between the first battery cell assembly and the second battery cell assembly, in which a first side surface and a second side surface of the cross beam are inclined with respect to the mounting surface of the bottom plate, the first side surface of the cross beam facing the first battery cell assembly, and the second side surface of the cross beam facing the second battery cell assembly.

Description

Technical Field

[0001] The present disclosure relates to a battery pack. This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0088283 filed on Jul. 7, 2023, the entire contents of which are incorporated herein by reference. Background Art

[0002] Unlike primary batteries, secondary batteries can be charged and discharged many times. Secondary batteries have been widely used as energy sources for various types of wireless devices such as mobile phones, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has been significantly reduced due to increased energy density and economies of scale, and the cruising range of battery electric vehicles (BEVs) has increased to the same level as that of fuel vehicles, the main use of secondary batteries has shifted from mobile devices to vehicles (mobility).

[0003] In order to meet the rapidly expanding demand for secondary batteries for automobiles, battery cell manufacturers are paying huge capital expenditures. Secondary batteries manufactured by efficient secondary battery manufacturing processes and assembled in a conventional manner can help increase the production capacity of each production line. Therefore, various studies are being conducted to improve the process efficiency of secondary battery manufacturing and the assemblability of battery packs. Summary of the invention

[0004] Technical issues

[0005] The present disclosure is directed to providing a battery pack having improved productivity.

[0006] Technical Solution

[0007] An exemplary embodiment of the present disclosure provides a battery pack. The battery pack includes: a bottom plate; a first battery cell assembly, which is disposed on a mounting surface of the bottom plate and includes a plurality of first battery cells and a first side beam combined with the plurality of first battery cells; a second battery cell assembly, which is disposed on the mounting surface of the bottom plate and includes a plurality of second battery cells and a second side beam combined with the plurality of second battery cells; and a cross beam, which is located between the first battery cell assembly and the second battery cell assembly, wherein a first side surface and a second side surface of the cross beam are inclined relative to the mounting surface of the bottom plate, the first side surface of the cross beam faces the first battery cell assembly, and the first side surface of the cross beam faces the second battery cell assembly.

[0008] The first side beam may include a first inclined surface facing the first side of the cross beam; and the second side beam may include a second inclined surface facing the second side of the cross beam.

[0009] The first side beam may include a first horizontal surface perpendicular to the mounting surface of the bottom plate and connected to the first inclined surface, and the second side beam may include a second horizontal surface parallel to the mounting surface of the bottom plate and connected to the second inclined surface.

[0010] The first side beam may include a first vertical surface perpendicular to the mounting surface of the floor and connected to the first horizontal surface, and the second side beam may include a second vertical surface parallel to the mounting surface of the floor and connected to the second horizontal surface.

[0011] Each of the first horizontal surface and the second horizontal surface may overlap with the mounting surface of the beam, and the upper surface of the beam may be connected with the first side surface and the second surface, and the first vertical surface and the second vertical surface may face each other.

[0012] The beam may include a lower surface that contacts the mounting surface of the base plate, and each of the first side surface and the second side surface of the beam may be connected to the lower surface of the beam.

[0013] A length of an upper surface of the beam in the first direction may be different from a length of a lower surface of the beam in the first direction, and the first direction may be parallel to a mounting surface of the base plate.

[0014] A length of an upper surface of the beam in the first direction may be smaller than a length of a lower surface of the beam in the first direction.

[0015] The first and second side surfaces may be spaced apart from each other in a first direction parallel to a mounting surface of the bottom plate, and a plurality of first battery cells may be arranged along the first direction.

[0016] The cross section of the beam may be trapezoidal.

[0017] An exemplary embodiment of the present disclosure provides a battery pack. The battery pack includes: a bottom plate; a plurality of battery cell assemblies located on a mounting surface of the bottom plate and each including a plurality of first battery cells and a first side beam and a second side beam; and a cross beam located between the plurality of battery cell assemblies, wherein each cross beam may have a trapezoidal cross section.

[0018] Each beam may include a lower surface contacting the mounting surface of the base plate, and the first side surface and the second side surface of each beam are each inclined relative to the mounting surface of the base plate and connected to the lower surface of the beam.

[0019] A length of an upper surface of each beam in the first direction may be different from a length of a lower surface of the beam in the first direction, and the first direction may be parallel to a mounting surface of the base plate.

[0020] A length of an upper surface of each beam in the first direction may be smaller than a length of a lower surface of the beam in the first direction.

[0021] Beneficial Effects

[0022] The battery pack according to the exemplary embodiment of the present disclosure includes a cross beam provided in a housing and having an inclined surface and a battery cell assembly including a side beam having a shape complementary to the cross beam. Therefore, the assemblability of the battery cell assembly can be improved and it can be easily disassembled even when the battery cell is swollen.

[0023] The effects that can be achieved by the exemplary embodiments of the present disclosure are not limited to the above effects, and those skilled in the art to which the exemplary embodiments of the present disclosure belong will clearly derive and understand other effects not described herein based on the following description. That is, those skilled in the art can derive the unexpected effects achieved when implementing the exemplary embodiments of the present disclosure based on the exemplary embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a top view of a battery pack according to an exemplary embodiment.

[0025] Figure 2 According to an exemplary embodiment, Figure 1 A cross-sectional view taken along line II-II′.

[0026] Figure 3 is a top view of a battery pack according to an exemplary embodiment.

[0027] Figure 4 According to an exemplary embodiment, Figure 3 A cross-sectional view taken along line 3I-3I′.

[0028] Figure 5 is a top view of a battery pack according to an exemplary embodiment.

[0029] Figure 6 According to an exemplary embodiment, Figure 5 A cross-sectional view taken along line 5I-5I'. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present disclosure, the terms or expressions used in the present specification and claims should not be interpreted as limited to the terms or expressions generally understood or defined in a commonly used dictionary, but should be understood according to the meanings and concepts corresponding to the present disclosure based on the principle that the inventor of the present application can appropriately define the terms or expressions to best interpret the present disclosure.

[0031] Therefore, the embodiments described herein and the configurations shown in the accompanying drawings are merely examples of the present disclosure and do not reflect all technical concepts of the present disclosure. Therefore, it should be understood that various equivalents and modifications have been made to replace the configurations on the filing date of the present application.

[0032] When it is determined that well-known configurations or functions related to describing the present disclosure would obscure the subject matter of the present disclosure due to unnecessary details, such configurations or functions are not described in detail.

[0033] Since the embodiments of the present disclosure are provided to more fully explain the present disclosure to those skilled in the art, the shapes, sizes, etc. of the components shown in the drawings may be magnified, omitted, or schematically illustrated for the sake of clarity. Therefore, it should not be understood that the sizes or ratios of the components fully reflect their actual sizes or ratios.

[0034] (First embodiment)

[0035] Figure 1 is a top view of a battery pack 100 according to an exemplary embodiment. Figure 1 , the cover plate 140 is omitted.

[0036] Figure 2 It is along Figure 1 A cross-sectional view taken along line 1I-1I′.

[0037] Reference Figure 1 and Figure 2 The battery pack 100 may include a housing 110 , a plurality of battery cell assemblies 120 , a middle beam 131 , a cross beam 133 , and a cover plate 140 .

[0038] The case 110 may provide a space for mounting a plurality of battery cell assemblies 120 therein. The case 110 may include a bottom plate 111 and side walls 112 , 113 , 114 , and 115 .

[0039] Two directions substantially parallel to the mounting surface 111U of the base plate 111 are defined as an X-axis direction and a Y-axis direction, and a direction substantially perpendicular to the mounting surface 111U of the base plate 111 is defined as a Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction may be substantially perpendicular to each other. Unless otherwise specified, the definition of directions will apply to the following drawings.

[0040] The bottom plate 111 may include a plurality of plates that are friction stir welded to each other. The bottom plate 111 may include a plurality of cooling channels, a plurality of cavities, and ribs. Each of the cooling channels, cavities, and ribs may extend in the X-axis direction. The cooling channels may provide a path for the flow of a cooling fluid. The cooling channels may be spaced apart from each other in the Y-axis direction. The cooling channels may be arranged along the Y-axis direction. The plurality of cavities are empty internal spaces of the bottom plate 111. By forming a plurality of cavities, the mass of the bottom plate 111 may be reduced, and therefore, the energy density of the battery pack 100 is improved. The ribs may define a plurality of cooling channels and a plurality of cavities. The ribs may surround a plurality of cooling channels and a plurality of cavities. The airtightness of the plurality of cooling channels and the plurality of cavities may be maintained by the ribs.

[0041] The side walls 112, 113, 114, and 115 may be combined with the bottom plate 111. The side walls 112, 113, 114, and 115 may be combined with the bottom plate 111 by, for example, friction stir welding.

[0042] The side walls 112 and 113 may be substantially perpendicular to the X-axis direction. The side walls 112 and 113 may be spaced apart from each other in the X-axis direction. The side walls 114 and 115 may be substantially perpendicular to the Y-axis direction. The side walls 114 and 115 may be spaced apart from each other in the Y-axis direction.

[0043] A plurality of battery cell assemblies 120 may be located on a bottom plate 111 of the housing 110. The bottom plate 111 may support the plurality of battery cell assemblies 120. 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.

[0044] For example, the battery pack 100 may be a module-less battery pack, and each of the plurality of battery cell assemblies 120 may not include a module frame. As another example, the battery pack 100 may be a module-type battery pack, and each of the plurality of battery cell assemblies 120 may not include a module frame.

[0045] 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 combined with the battery cells 121.

[0046] A plurality of battery cells 121 are basic units of lithium-ion batteries (i.e., secondary batteries). Each of the plurality of battery cells 121 includes an electrode assembly, an electrolyte, a housing, and an electrode lead. Each of the plurality of battery cells 121 may be one of a cylindrical battery cell, a square battery cell, and a soft-pack battery cell. The electrode assembly of the cylindrical battery cell is built into a cylindrical metal hard shell. The electrode assembly of the square battery cell is built into a square metal hard shell. The electrode assembly of the soft-pack battery cell is built into a soft-pack housing including an aluminum laminate sheet.

[0047] The electrode assembly may include a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The electrode assembly may be a wound electrode assembly or a stacked electrode assembly. The wound electrode assembly may include a structure in which the positive electrode, the negative electrode, and a separator interposed therebetween are wound together. The stacked electrode assembly may include a plurality of positive electrodes, a plurality of negative electrodes, and a plurality of separators interposed therebetween stacked in sequence.

[0048] The electrode lead may be combined with 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 tab and the negative electrode tab. The electrode lead may be an external connection terminal of each of the plurality of battery cells 121.

[0049] The plurality of battery cells 121 form a plurality of groups connected in series to each other. Each of the plurality of groups may include one or more battery cells 121 connected in parallel. Each of the plurality of groups may include one or more battery cells connected in parallel. The number of groups connected in series and the number of battery cells connected in parallel may be determined according to the voltage and current to be output from the stack of the plurality of battery cell assemblies 120.

[0050] Each of the plurality of battery cells 121 may further include a lead cover assembly. The lead cover assembly may include a lead cover frame and an integrated circuit. For example, 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. Therefore, the lead cover frame may prevent an undesired short circuit between the electrode leads of the plurality of battery cells 121 and external elements.

[0051] The plurality of battery cells 121 may be arranged along the Y-axis direction. Therefore, the electrode leads of the plurality of battery cells 121 may be aligned. A separator may be interposed between the plurality of battery cells 121. The separator may be a polyurethane pad for preventing expansion of the plurality of battery cells 121 or a separator for thermally isolating the battery cells 121.

[0052] The side beams 125A and 125B may be spaced apart from each other, and a plurality of battery cells 121 may be interposed between the side beams 125A and 125B. The side beams 125A and 125B may be spaced apart from each other in the Y-axis direction. A plurality of battery cells 121 may be interposed between the side beams 125A and 125B. The side beams 125A and 125B may be fixed to the plurality of battery cells 121 by an adhesive, but the embodiment is not limited thereto.

[0053] Each of the side beams 125A and 125B may include a coupling surface 125CS and an assembly surface 125AS. The coupling surface 125CS and the assembly surface 125AS may be opposite to each other. The coupling 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.

[0054] The coupling surface 125CS of each of the side beams 125A and 125B may face the plurality of battery cells 121. The coupling surface 125CS of each of the side beams 125A and 125B may contact one of the plurality of battery cells 121.

[0055] The mounting surface 125AS of each of the side beams 125A and 125B may face a corresponding one of the cross beams 133. The mounting surface 125AS of the side beam 125A of each of the plurality of battery cells 121 may face the mounting surface 125AS of the side beam 125B of an adjacent battery cell 121 among the plurality of battery cells 121.

[0056] The mounting surface 125AS of each of the side beams 125A and 125B may include an inclined surface 125S, a horizontal surface 125H, and a vertical surface 125V. The inclined surface 125S may be inclined relative to the mounting surface 111U of the bottom plate 111. The horizontal surface 125H may be substantially parallel to the mounting surface 111U of the bottom plate 111. The horizontal surface 125H may be connected to the inclined surface 125S. The vertical surface 125V may be substantially perpendicular to the mounting surface 111U of the bottom plate 111. The vertical surface 125V may be connected to the horizontal surface 125H of the bottom plate 111.

[0057] The inclined surface 125S may face the side surface 133S1 or the side surface 133S2 of a corresponding one of the cross beams 133. The horizontal surface 125H may face the upper 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 may face the vertical surface 125V of the side beam 125B of the adjacent battery cell 121 among the plurality of battery cells 121.

[0058] The inclined surface 125S may contact the side surface 133S1 or the side surface 133S2 of a corresponding one of the cross beams 133. The horizontal surface 125H may contact the upper 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 may contact the vertical surface 125V of the side beam 125B of the adjacent battery cell 121 among the plurality of battery cells 121.

[0059] The plurality of battery cell assemblies 120 may be arranged along the X-axis direction and the Y-axis direction. Figure 1 , the number of battery cell assemblies 120 arranged along the X-axis direction is three, and the number of battery cell assemblies 120 arranged along the Y-axis direction is two. Therefore, the array of multiple battery cell assemblies 120 can be a 3×2 array. Based on the above description, a person skilled in the art will be able to easily derive multiple battery cell assemblies 120 arranged in an M×N array (here, M and N are integers greater than 2, respectively).

[0060] The middle beam 131 may be located on the bottom plate 111. The middle beam 131 may extend in the X-axis direction. The middle beam 131 may be combined with the bottom plate 111. The middle beam 131 may be welded to the bottom plate 111. Alternatively, the middle beam 131 may be integrally formed with the bottom plate 111 by an extrusion molding process, and in this case may be included in the bottom plate 111.

[0061] The middle beam 131 may be interposed between the plurality of battery cell assemblies 120. The middle beam 131 may space the plurality of battery cell assemblies 120 in the Y-axis direction. The plurality of battery cell assemblies 120 may be spaced apart from each other in the Y-axis direction with the middle beam 131 interposed therebetween.

[0062] The cross beam 133 may be located on the bottom plate 111. The cross beam 133 may extend in the Y-axis direction. The cross beam 133 may be combined with the bottom plate 111. The cross beam 133 may be welded to the bottom plate 111.

[0063] The crossbeam 133 may be interposed between the plurality of battery cell assemblies 120 to separate the electronic component mounting region EMR from the plurality of battery cell assemblies 120, or may be interposed between the sidewall 115 and the plurality of battery cell assemblies 120. The crossbeam 133 may separate the plurality of battery cell assemblies 120 in the X-axis direction. The plurality of battery cell assemblies 120 may be spaced apart from each other in the X-axis direction with the crossbeam 133 interposed therebetween.

[0064] Each beam 133 may include side surfaces 133S1 and 133S2, a lower surface 133L, and an upper surface 133U. The lower surface 133L may contact the mounting surface 111U of the bottom 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-axis direction. The upper surface 133U may be connected to the side surfaces 133S1 and 133S2.

[0065] The cross section of the crossbeam 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 inclined relative to the mounting surface 111U of the base plate 111. The length of the upper surface 133U in the X-axis direction may be different from the length of the lower surface 133L in the X-axis direction. The length of the upper surface 133U in the X-axis direction may be less than the length of the lower surface 133L in the X-axis direction.

[0066] According to an exemplary embodiment, the side beams 125A and 125B may have a shape complementary to that of the cross beam 133. According to an exemplary embodiment, the side beams 125A and 125B may be combined with the cross beam 133. Therefore, the side beams 125A and 125B and the cross beam 133 may form a cross beam assembly for spacing adjacent battery cell assemblies 120 apart.

[0067] According to an exemplary embodiment, due to the inclination of the side surfaces 133S1 and 133S2 of each cross member 133 and the inclined surfaces 125S of the side members 125A and 125B, the assemblability of the battery cell assembly 120 can be improved. According to an exemplary embodiment, even when the battery cell 121 is expanded due to the use of the battery pack 100, due to the inclination of the side surfaces 133S1 and 133S2 of each cross member 133 and the inclined surfaces 125S2 of the side members 125A and 125B, the battery cell assembly 120 can be easily detached from the battery pack 100.

[0068] Figure 1 The arrangement of the middle beam 131, the cross beam 133 and the plurality of battery cell assemblies 120 shown in the figure is a non-limiting example and should not be understood as limiting the technical concept of the present disclosure in any sense. According to the above description, a person skilled in the art will easily derive a battery pack including various numbers and arrangements of middle beams, cross beams and battery cell assemblies.

[0069] The cover plate 140 may be combined with the side walls 112, 113, 114, and 115. The cover plate 140 may cover elements inside the battery pack 100, such as the battery cell assembly 120 and electronic components. The cover plate 140 may be fixed to the side walls 112, 113, 114, and 115 by a mechanical coupling means such as a fastening member.

[0070] The battery pack 100 may further include a vent. For example, the vent may be combined with the side wall 112. The side wall 112 may include a vent hole, and the vent may be combined with the vent hole of the side wall 112. Each vent may include a spring type or a rupture disk. Each vent may be configured to discharge gas from the interior of the battery pack 100 when the internal pressure of the battery pack 100 exceeds a threshold value.

[0071] The exhaust device may be configured to delay heat propagation by exhausting high-temperature gas from the inside of the battery pack 100 to the outside when at least one of the plurality of battery cell assemblies 120 is in a thermal runaway state.

[0072] Here, the thermal runaway state of the plurality of battery cell assemblies 120 is a state in which the temperature change of the plurality of battery cell assemblies 120 accelerates the temperature change, that is, a runaway positive feedback. The temperature of the plurality of battery cell assemblies 120 in the thermal runaway state rises rapidly, and a large amount of high-pressure gas and burning fragments are discharged.

[0073] The battery pack 100 may further include electronic components. The electronic components may be located on the electronic component mounting region EMR of the housing 110. The electronic components may include electronic devices required to drive the battery pack 100.

[0074] For example, the electronic components may include a battery management system (BMS). The BMS may be configured to monitor, balance, and control the battery pack 100. Monitoring of the battery pack 100 may include measuring voltages and currents of certain nodes within the plurality of battery cell assemblies 120 and measuring temperatures of set locations in the battery pack 100. The battery pack 100 may include measuring voltages, currents, and temperatures as described above.

[0075] The balancing of the battery pack 100 is an operation to reduce the deviation between the plurality of battery cell assemblies 120. The control of the battery pack 100 includes preventing overcharge, overdischarge and overcurrent. Through monitoring, balancing and control, the battery pack 100 can operate under optimal conditions, thereby preventing the life of each of the plurality of battery cell assemblies 120 from being shortened.

[0076] The electronic components may also include: a cooling device, a power relay assembly (PRA), a safety plug, etc. The cooling device may include a cooling fan. The cooling fan may circulate air in the battery pack 100 to prevent overheating of each of the multiple 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 motor of a vehicle). When an abnormal voltage such as a voltage surge occurs, the PRA may cut off power to an external load (e.g., a motor of a vehicle) to protect the multiple battery cell assemblies 120 and the external load (e.g., a motor of a vehicle).

[0077] The battery pack 100 may further include a plurality of bus bars configured to be electrically connected to the plurality of battery cell assemblies 120. The plurality of battery cell assemblies 120 may be connected in series through the plurality of bus bars. Therefore, the battery pack 100 may be configured to output high voltage to an external load (eg, a motor of a vehicle).

[0078] (Second embodiment)

[0079] Figure 3 is a top view of a battery pack 101 according to an exemplary embodiment. Figure 3 , the cover plate 140 is omitted.

[0080] Figure 4 It is along Figure 3 A cross-sectional view taken along line 3I-3I'.

[0081] Figure 3 and Figure 4 The battery pack 101 includes a housing 110 , a plurality of battery cell assemblies 120 , a middle beam 131 , a cross beam 133 , cross beams 134 and 135 , and a cover plate 140 .

[0082] The housing 110, the plurality of battery cell assemblies 120, the middle beam 131, the cross beam 133 and the cover plate 140 are similar to those described above. Figure 1 and Figure 2 The contents of the description are substantially the same, and therefore, redundant descriptions thereof are omitted here.

[0083] Beams 134 and 135 may be spaced apart from each other, with beam 133 interposed between beams 134 and 135. Beam 133 may be interposed between beams 134 and 135. Beam 134 may be adjacent to sidewall 114. Beam 135 may be adjacent to sidewall 115. Beam 135 may contact sidewall 115.

[0084] According to an exemplary embodiment, the beam 134 may include only one inclined surface 134S, and the beam 135 may include only one inclined surface 135S. The length of each of the beams 134 and 135 in the X-axis direction may be different from the length of the beam 133 in the X-axis direction. The length of each of the beams 134 and 135 in the X-axis direction may be less than the length of the beam 133 in the X-axis direction.

[0085] According to an exemplary embodiment, the cross member 135 may be combined with the side member 125A, and the cross member 134 may be combined with the side member 125B. Therefore, the overall length of the battery pack 101 may be reduced, and the energy density of the battery pack 101 may be improved.

[0086] (Third Embodiment)

[0087] Figure 5is a top view of a battery pack 102 according to an exemplary embodiment. Figure 5 , the cover plate 140 is omitted.

[0088] Figure 6 It is along Figure 5 A cross-sectional view taken along line 5I-5I'.

[0089] Reference Figure 5 and Figure 6 The battery pack 102 may include a housing 110 , a plurality of battery cell assemblies 120 , a middle beam 131 , a cross beam 133 , and a cover plate 140 .

[0090] The housing 110, the plurality of battery cell assemblies 120, the middle beam 131, the cross beam 133 and the cover plate 140 are similar to those described above. Figure 1 and Figure 2 The contents of the description are substantially the same, and therefore, redundant descriptions thereof are omitted here.

[0091] The cross beam 133 may be inserted only between the plurality of battery cell assemblies 120. Therefore, the number of the cross beams 133 may be less than the number of the battery cell assemblies 120. For example, when the battery pack 102 includes 2N battery cell assemblies 120 (N is an integer greater than or equal to 2), the battery pack 102 may include (2N-2) cross beams 133. Therefore, 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.

[0092] The present disclosure has been described in detail above with reference to the accompanying drawings, embodiments, etc. However, the configurations shown in the drawings or embodiments described in the present disclosure are only embodiments of the present disclosure and do not reflect all technical concepts of the present disclosure, and therefore, it should be understood that various equivalents and modifications have been made to replace the configurations on the filing date of the present application.

Claims

1. A battery pack comprising: Base plate; a first battery cell assembly, the first battery cell assembly being located on the mounting surface of the bottom plate, the first battery cell assembly comprising a plurality of first battery cells and a first side beam combined with the plurality of first battery cells; a second battery cell assembly, the second battery cell assembly being located on the mounting surface of the bottom plate, the second battery cell assembly comprising a plurality of second battery cells and a second side beam combined with the plurality of second battery cells; as well as a crossbeam, the crossbeam being located between the first battery cell assembly and the second battery cell assembly, The first side surface and the second side surface of the cross beam are inclined relative to the mounting surface of the bottom plate, the first side surface of the cross beam faces the first battery cell assembly, and the second side surface of the cross beam faces the second battery cell assembly.

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

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

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

5. The battery pack according to claim 4, wherein: Each of the first horizontal surface and the second horizontal surface overlaps with a mounting surface of the beam, and an upper surface of the beam is connected with the first side surface and the second surface, and The first vertical surface and the second vertical surface face each other.

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

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

8. The battery pack according to claim 7, wherein: A length of the upper surface of the beam in the first direction is smaller than a length of the lower surface of the beam in the first direction.

9. The battery pack according to claim 1, wherein: 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 plurality of first battery cells are arranged along the first direction.

10. The battery pack according to claim 1, wherein: The cross section of the cross beam is trapezoidal.

11. A battery pack comprising: Base plate; a plurality of battery cell assemblies on the mounting surface of the bottom plate, wherein each of the plurality of battery cell assemblies includes a plurality of first battery cells and a first side beam and a second side beam; and A crossbeam, wherein the crossbeam is located between the plurality of battery cell assemblies, Wherein, the cross section of each of the cross beams is trapezoidal.

12. The battery pack according to claim 11, wherein: Each of the beams includes a lower surface that contacts the mounting surface of the base plate, and The first side surface and the second side surface of each of the cross beams are respectively inclined relative to the mounting surface of the base plate and connected to the lower surface of the cross beam.

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

14. The battery pack according to claim 13, wherein: The length of the upper surface of each beam in the first direction is smaller than the length of the lower surface of the beam in the first direction.

Images