Battery pack and electric device with same

Abstract

The utility model relates to battery technology field provides a kind of battery pack and the electric equipment with it.The battery pack includes box, multiple battery modules, fixing band and multiple end plates.The box is equipped with accommodating space.Each battery module includes multiple batteries, each battery has thickness direction and width direction, multiple batteries are stacked along thickness direction, multiple battery modules are arranged along width direction, to be arranged into cuboid shape, and be located in accommodating space.Fixing band surrounds the outer periphery of multiple battery modules, to fix multiple battery modules together to form battery module assembly.Multiple end plates are spaced apart and surrounded by fixing band, to be fixed to the outer periphery of multiple battery modules.Battery is stacked into battery module first, then arranged to form battery module assembly, and by multiple end plates and fixing band located at its outer periphery are jointly constrained, not only can improve the structural rigidity of battery module assembly, also help to improve the energy density of whole battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular, to a battery pack and an electrical device having the same. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage systems, and other fields, batteries have been widely used due to their advantages such as high energy density and long cycle life. As the core energy supply unit, the structural design of the battery pack directly affects the performance, safety, and space utilization of the entire electrical equipment. For example, to improve the energy density of the battery pack, it is necessary to arrange as many batteries as possible within a limited enclosure space.

[0003] In the field of marine power supply, to effectively improve the ship's endurance, it is necessary to arrange more battery modules and increase battery energy density within limited cabin space. In addition, the continuous vibration and impact conditions during navigation also place more stringent requirements on the overall structural rigidity of the battery pack.

[0004] However, the traditional battery module layout has inherent defects such as low space utilization, insufficient structural rigidity and loose overall structure, which not only makes it inconvenient to transport and install, but also makes it difficult to achieve the optimal spatial layout while ensuring structural strength requirements. Utility Model Content

[0005] In view of this, the present invention provides a battery pack and an electrical device having the same, which aims to improve the overall structural rigidity of the battery module while taking into account the energy density of the battery pack.

[0006] In a first aspect, the battery pack provided by this utility model includes a housing, multiple battery modules, fixing straps, and multiple end plates. The housing has a receiving space. Each battery module includes multiple batteries, each battery having a thickness direction and a width direction. The multiple batteries are stacked along the thickness direction, and the multiple battery modules are arranged along the width direction to form a cuboid shape and placed within the receiving space. The fixing straps surround the outer periphery of the multiple battery modules to fix them together to form a battery module assembly. The multiple end plates are spaced apart and surrounded by the fixing straps to fix them to the outer periphery of the multiple battery modules.

[0007] Secondly, the electrical equipment provided by this utility model includes the battery pack of the first aspect.

[0008] The beneficial effects of the battery pack provided in the above embodiments of this utility model are as follows: The batteries are first stacked into battery modules, and then arranged to form a battery module assembly. The assembly is constrained by multiple end plates and fixing straps located on its outer periphery. This not only improves the structural rigidity of the battery module assembly, enabling it to effectively resist vibration and impact and expansion stress during battery charging and discharging, but also maximizes the use of the housing space, which helps to improve the energy density of the entire battery pack. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0010] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0011] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0012] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0013] Figure 1 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0014] Figure 2 yes Figure 1 A schematic diagram of the battery pack structure.

[0015] Figure 3 yes Figure 2 An exploded view of the battery pack.

[0016] Figure 4 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0017] Figure 5 yes Figure 1 An exploded view of a portion of the battery pack.

[0018] Figure 6 yes Figure 4 A magnified view of a portion of the image.

[0019] Figure 7 yes Figure 2 A schematic diagram of a portion of the battery pack.

[0020] Figure 8 yes Figure 4 Side view of the battery pack.

[0021] Explanation of reference numerals in the attached drawings: Battery pack - 100; Battery - 10; Battery module - 11; Battery module assembly - 12; Fixing strap - 20; Metal fixing strap - 21; Plastic fixing strap - 22; Housing - 30; Accommodation space - 31; Bottom beam - 32; Second positioning hole - 321; End plate - 40; Arc part - 41; Rivet - 42; Lifting point - 43; Positioning component - 44; First positioning hole - 45; Mounting hole - 46; Heat insulation component - 51; Connector - 60; Connection hole - 61; Busbar - 70; Terminal - 80; Support - 90; Electrical equipment - 200. Detailed Implementation

[0022] The embodiments of the present invention will now be described by way of example with reference to the accompanying drawings. It should be understood that there are many ways to implement the present invention, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of the present invention.

[0023] <Example Electrical Equipment> refer to Figure 1 This utility model provides an electrical device 200, which includes a battery pack 100.

[0024] For example, electrical equipment 200 may be, but is not limited to, ships, vehicles, aircraft, household appliances, and industrial equipment. For instance, ships may be container ships, inland waterway transport vessels, sightseeing boats, yachts, etc.

[0025] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0026] In a non-restrictive example, refer to Figure 1 The electrical equipment 200 can power the sightseeing boat 200, and the battery pack 100 can be used as a power source for the sightseeing boat 200.

[0027] <Example Battery Pack> refer to Figure 2 and Figure 3 A battery pack 100 is shown. The battery pack 100 includes a plurality of batteries 10, which store chemical energy and controllably convert chemical energy into electrical energy. In recyclable batteries, the active materials can be activated by charging after discharge for continued use.

[0028] It is understood that in this embodiment of the present invention, battery 10 refers to an energy storage device that can be repeatedly charged and discharged. Battery 10 can be a lithium-ion battery, sodium-ion battery, nickel-metal hydride battery, etc.

[0029] It is understood that this utility model does not impose any particular limitation on the shape of the battery 10; the battery 10 can be cylindrical, flat, cuboid, or other shapes. (Reference) Figure 3 In the current embodiment, the battery 10 is a square battery 10. It can be understood that in other examples of this utility model, the battery 10 can also be implemented as a cylindrical battery 10 and a pouch battery 10.

[0030] Combination Figure 3 and Figure 4 Multiple batteries 10 can be combined in series and / or parallel to form a battery module 11. In the current embodiment, the battery pack 100 includes multiple battery modules 11, each battery 10 having a thickness direction and a width direction. The multiple batteries 10 are stacked along the thickness direction, and the multiple battery modules 11 are arranged along the width direction to form a cuboid shape. The multiple battery modules 11 form a battery module assembly 12.

[0031] refer to Figure 4 The battery pack 100 also includes a plurality of end plates 40, which are disposed along the thickness direction at at least one end of the battery module 11 to counteract and constrain the expansion force generated by the battery 10 during cyclic use, thereby preventing the battery module 11 from increasing in size due to internal stress and ensuring its long-term structural stability.

[0032] It is understood that the material of the end plate 40 is not particularly limited in this embodiment of the present invention. For example, the end plate 40 can be a metal material such as aluminum or steel, or a non-metallic composite material such as engineering plastics, fiberglass, or carbon fiber.

[0033] It is understood that the present invention does not impose any particular restrictions on the structure of the end plate 40. For example, the end plate 40 can be a flat plate structure with a thickness of 2-25mm. This range of values ​​can balance structural strength and energy density. Specifically, it can ensure that the end plate 40 has sufficient structural strength while avoiding excessive thickness of the end plate 40, which would reduce the energy density of the battery module 11.

[0034] It is understood that the present invention does not impose any particular restrictions on the processing method of the end plate 40. For example, the end plate 40 can be made of aluminum alloy sheet by extrusion and / or machine tool processing.

[0035] It should be noted that in the accompanying drawings of this utility model, arrows Z+ and Z- can be used to indicate opposite sides in the up-down direction; arrows X+ and X- can be used to indicate opposite sides in the thickness direction; arrows Y+ and Y- can be used to indicate opposite sides in the width direction, and the thickness direction, width direction and up-down direction are perpendicular to each other.

[0036] refer to Figure 3The battery pack 100 also includes a housing 30, within which a receiving space 31 is provided, and the battery module assembly 12 is disposed within the receiving space 31. Exemplarily, the housing 30 may include an outer shell and a bracket. The outer shell includes a main body and a top cover, with the top cover disposed on the upper side of the main body and sealed to it. The bracket is used to support, fix, and mount the battery module and other components. As an example, the bracket may be made of high-strength steel and fixed to the inner wall of the outer shell by welding or bolting, providing a stable mounting base for the battery module and other components, ensuring that they do not shift under adverse conditions such as vibration or impact.

[0037] The battery pack 100 also includes a battery management system (BMS) and an electrical connection system (e.g., high-voltage connectors and low-voltage connectors), which are also housed in the housing space 31.

[0038] The battery management system (BMS) is used to monitor and manage the operating status of battery 10, such as voltage, current, and temperature. When the BMS detects an abnormal operating status of battery 10, it will execute corresponding protection measures according to the set protection strategy. For example, when the temperature of battery 10 is too high, the BMS will reduce the charging or discharging rate to ensure that the temperature of battery 10 is maintained within a safe range.

[0039] The battery management system also includes a signal acquisition component for acquiring the voltage and temperature signals of each battery cell and transmitting the data to the battery management system, providing real-time data for battery status monitoring and safety protection. For example, the signal acquisition component can be a flexible printed circuit (FPC), a printed circuit board (PCB), or a flexible flat cable (FCC).

[0040] High-voltage connectors are responsible for transmitting high-voltage, high-current main energy paths, collecting electrical energy after batteries are connected in series and parallel, and providing electrical connections between the battery pack and external high-voltage systems. Low-voltage connectors are used to transmit low-voltage, low-current signals and control commands, mainly connecting the slave control units of the battery management system to various sensors, and transmitting key monitoring data such as battery voltage and temperature to the main controller of the battery management system in real time.

[0041] Components such as the battery management system and electrical connection system also need to be fixed inside the housing 30 by brackets. This places high demands on the internal space layout of the battery pack 100: it is necessary to make the most efficient use of the housing 30's space 31 while ensuring the normal operation of each component, so as to improve the overall energy density of the battery pack 100.

[0042] In view of this, refer to Figures 2 to 4 The battery pack 100 provided in this embodiment of the present invention also includes a fixing strap 20 and a plurality of end plates 40. The fixing strap 20 surrounds the outer periphery of the plurality of battery modules 11 to fix the plurality of battery modules 11 together to form a battery module assembly 12. The plurality of end plates 40 are spaced apart and surrounded by the fixing strap 20 to fix them to the outer periphery of the plurality of battery modules 11.

[0043] The batteries 10 are first stacked into battery modules 11, and then arranged to form a battery module assembly 12, which is constrained by multiple end plates 40 and fixing straps 20 located on its outer periphery. This not only improves the structural rigidity of the battery module assembly 12, enabling it to effectively resist vibration and impact and expansion stress during the charging and discharging process of the batteries 10, but also maximizes the use of the housing space 31 of the box 30, which helps to improve the energy density of the entire battery pack 100.

[0044] refer to Figure 4 Each battery module 11 has end plates 40 on both sides in the thickness direction. Fixing straps 20 are located on the outer sides of the battery modules 11 in the thickness direction and on the outer sides of the end plates 40 in the width direction. According to the battery pack 100 in this embodiment, when the fixing straps 20 apply a tightening force, it is first transmitted to the end plates 40, and then transmitted by the end plates 40 along the thickness direction to the battery modules 11. This force transmission path avoids the concentrated stress of the fixing straps 20 acting directly on the battery modules 11, thereby reducing the risk of damage to the batteries 10 due to mechanical compression deformation. It also ensures that the battery modules 11 maintain a stable pre-tightened state under charge / discharge cycles and vibration conditions, improving the overall structural safety and service life of the battery pack 100.

[0045] refer to Figure 4 and Figure 6 Each end plate 40 has an arc portion 41 on the side closest to the adjacent end plate 40 in the width direction. When a battery module 11 experiences thermal runaway, the resulting high temperature is rapidly conducted to the end plates 40 located on both sides of it in the thickness direction, causing their temperature to exceed the safety threshold in a very short time. To solve the above problem, the battery pack 100 provided by this utility model has two adjacent end plates 40 in the width direction contacting each other through two arc portions 41. This effectively reduces the contact area between the two adjacent end plates 40, thereby suppressing heat conduction between the two end plates 40. Even if a battery module 11 experiences thermal runaway and its adjacent end plates 40 experience a rapid temperature increase, this method of reducing the contact area between the two end plates 40 can effectively suppress the diffusion rate of high temperature through the end plates 40 to the adjacent battery module 11, thereby suppressing heat spread and improving the overall safety of the battery pack 100.

[0046] Continue to refer to Figure 4 and Figure 6 The battery pack 100 also includes a heat insulation element 51 disposed between two adjacent end plates 40 in the width direction. The heat insulation element 51 absorbs and blocks heat between the two adjacent end plates 40, thereby further blocking the heat conduction path between them. In this way, even if an end plate 40 heats up due to thermal runaway of one battery module 11, the heat insulation element 51 can effectively delay or prevent heat transfer to the adjacent end plate 40, thus preventing heat spread to the adjacent battery module 11. Furthermore, the heat insulation element 51 can also absorb and buffer the minor deformation stress generated by the end plates 40 and battery modules 11 during charge-discharge cycles or vibrations to a certain extent, thereby improving structural reliability.

[0047] It is understood that the heat insulation component 51 can be implemented in various ways, and this utility model does not impose any particular restrictions on it. For example, the material of the heat insulation component 51 can be one of gel, silicone, or epoxy resin.

[0048] refer to Figures 4 to 6 The battery pack 100 also includes a connector 60 extending along the width direction, which is fixedly connected to two adjacent end plates 40 in the width direction. By fixing the connector 60 to the end plates 40, a lateral connection is established between the multiple end plates 40, thereby restricting the rotation or lateral displacement of each end plate 40 in a plane perpendicular to the vertical direction. When the battery module assembly 12 is subjected to external vibration, impact, or internal expansion force, the stability of the end plates 40 can be significantly enhanced, thereby ensuring the stability and reliability of the battery pack 100 under complex operating conditions.

[0049] refer to Figure 4 The battery pack 100 of this invention comprises multiple fixing straps 20, spaced apart along the vertical direction, with each strap surrounding the outer periphery of multiple battery modules 11. This distributed arrangement of multiple fixing straps 20 along the vertical direction decomposes the fastening force into multiple application points, thereby forming a uniform and stable fastening force throughout the entire height of the battery module assembly 12. Compared to a single fixing strap, this design effectively avoids the problem of localized pressure on the battery module 11 or insufficient binding force in the middle section due to stress concentration. This not only enhances the structural integrity of the battery pack 100 in the face of vibration and impact, but also better suppresses the expansion that the battery 10 may experience during cyclic use, thus comprehensively improving the long-term mechanical stability and operational safety of the battery module assembly 12.

[0050] It is understood that the material of the fixing strap 20 can be varied, and this utility model does not impose any particular limitation on it. As an example, the material of the fixing strap 20 can be a metal, such as aluminum or steel. As another example, the material of the fixing strap 20 can also be a plastic, such as polyethylene terephthalate (PET). In other examples, the material of the fixing strap 20 can also be a composite material, such as a high-strength fiber material.

[0051] Furthermore, the materials of the multiple fixing straps 20 can be the same or different.

[0052] As one possible implementation, refer to Figure 4 The plurality of fixing straps 20 includes two fixing straps 20 spaced apart in the vertical direction. The two fixing straps 20 include a metal fixing strap 21 and a plastic fixing strap 22.

[0053] Due to differences in material properties, the metal fixing strap 21 and the plastic fixing strap 22 will be installed using different methods. The metal fixing strap 21, due to its high rigidity and resistance to bending, needs to be pre-processed into a specific shape and installed by fitting it from top to bottom on the battery module 11. The elastic plastic strap, on the other hand, allows it to be directly wrapped around the battery pack on-site before the two ends are joined and secured.

[0054] As one possible implementation, continue to refer to Figure 4 The metal fixing strap 21 is located above the plastic fixing strap 22. The battery pack 100 provided by this utility model arranges the metal fixing strap 21 above the plastic fixing strap 22, so that the metal fixing strap 21 can be installed in place with a shorter path during installation, reducing the risk of interference or jamming with the end plate 40, thereby reducing assembly difficulty and operation time, and improving production efficiency and assembly reliability.

[0055] refer to Figure 8 In the vertical direction, the dimension of the end plate 40 is D1 mm, and the minimum distance from the metal fixing strip 21 to the end plate 40 is D2 mm, where 0.03 ≤ D2 mm / D1 mm ≤ 0.14. For example, D2 mm / D1 mm can be 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, or 0.14.

[0056] When the ratio of the minimum distance of the metal fixing band 21 to the end plate 40 in the vertical direction to the dimension of the end plate 40 in the vertical direction is less than 0.03, the fastening force generated by the metal fixing band 21 is close to the upper part of the end plate 40. This will cause the fixing band 20 to constrain the multiple battery modules 11 unevenly, and the battery module assembly 12 is prone to shaking when subjected to vibration and impact.

[0057] When the ratio of the minimum distance of the metal fixing strap 21 in the vertical direction to the end plate 40 to the dimension of the end plate 40 in the vertical direction is greater than 0.14, the installation path of the metal fixing strap 21 in the vertical direction is too long, which will increase the risk of the metal fixing strap 21 getting stuck, thereby increasing the installation difficulty.

[0058] The battery pack 100 provided by this utility model limits the ratio of the minimum distance of the metal fixing strap 21 to the end plate 40 in the vertical direction to the dimension of the end plate 40 in the vertical direction within the above-mentioned numerical range. This allows the fixing strap 20 to apply a uniform preload to multiple battery modules 11, ensuring the overall constraint effect of the multiple fixing straps 20 on the battery module assembly 12. It also shortens the installation path of the metal fixing strap 21, thereby reducing the risk of jamming and reducing the installation difficulty of the metal fixing strap 21.

[0059] Continue to refer to Figure 8 In the vertical direction, the minimum distance between the plastic fixing strap 22 and the metal fixing strap 21 is D3 mm, where 0.4 ≤ D3 mm / D1 mm ≤ 0.65. For example, D3 mm / D1 mm can be 0.40, 0.42, 0.44, 0.46, 0.48, 0.5, 0.52, 0.55, 0.57, 0.6, 0.62, or 0.65.

[0060] When the ratio of the minimum distance between the plastic fixing strip 22 and the metal fixing strip 21 in the vertical direction to the dimension of the end plate 40 in the vertical direction is less than 0.4, the distance between the plastic fixing strip 22 and the metal fixing strip 21 is small. As a result, the uniform preload applied by the two fixing strips 20 to the multiple battery modules 11 is too concentrated in the vertical direction, which is not conducive to the constraint effect on the battery module assembly 12.

[0061] When the ratio of the minimum distance between the plastic fixing band 22 and the metal fixing band 21 in the vertical direction to the dimension of the end plate 40 in the vertical direction is greater than 0.65, the metal fixing band 21 is closer to the upper part of the end plate 40, while the plastic fixing band 22 is closer to the lower part of the end plate 40. As a result, the constraint of the two fixing bands 20 on the middle part of the end plate 40 is too dispersed, and the battery module assembly 12 is prone to shaking when subjected to vibration and impact.

[0062] The battery pack 100 provided by this utility model, by limiting the ratio of the minimum distance of the plastic fixing strap 22 to the metal fixing strap 21 in the vertical direction to the size of the end plate 40 in the vertical direction within the above-mentioned numerical range, can avoid the two fixing straps 20 applying too concentrated or too dispersed uniform pre-tightening force to multiple battery modules 11 in the vertical direction, thereby ensuring the overall constraint effect of multiple fixing straps 20 on the battery module assembly 12.

[0063] As one possible implementation, the dimension of the end plate 40 in the vertical direction is D1 mm, where 140 mm ≤ D1 mm ≤ 170 mm. For example, D1 mm can be 140 mm, 142 mm, 145 mm, 148 mm, 150 mm, 152 mm, 155 mm, 158 mm, 160 mm, 162 mm, 165 mm, or 170 mm.

[0064] When the dimension of the end plate 40 in the vertical direction is less than 140mm, the installation space of the two fixing straps 20 is restricted. This will cause the uniform preload applied by the two fixing straps 20 to the multiple battery modules 11 to be too concentrated in the vertical direction, which is not conducive to the constraint effect on the battery module assembly 12.

[0065] When the dimension of the end plate 40 in the vertical direction is greater than 170mm, the end plate 40 will occupy more of the housing space 31 of the box 30, which is not conducive to the space utilization and energy density of the entire battery pack 100.

[0066] The battery pack 100 provided by this utility model, by limiting the size of the end plate 40 in the vertical direction to the above-mentioned numerical range, can provide sufficient installation space for the two fixing straps 20, ensuring that the pre-tightening force applied by the multiple fixing straps 20 to the multiple battery modules 11 in the vertical direction is relatively uniform, and will not occupy too much of the housing space 31 of the box 30, thereby ensuring the space utilization and energy density of the battery pack 100.

[0067] As one possible implementation, the minimum distance between the metal fixing strip 21 and the end plate 40 is D2 mm, where 5 mm ≤ D2 mm ≤ 20 mm. For example, D2 mm can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 14 mm, 16 mm, 18 mm, or 20 mm.

[0068] When the minimum distance from the metal fixing band 21 to the end plate 40 in the vertical direction is less than 5mm, the fastening force generated by the metal fixing band 21 is close to the upper part of the end plate 40. This will cause the fixing band 20 to constrain the multiple battery modules 11 unevenly, and the battery module assembly 12 will easily shake when subjected to vibration and impact.

[0069] When the minimum distance from the metal fixing strap 21 to the end plate 40 in the vertical direction is greater than 20mm, the installation path of the metal fixing strap 21 in the vertical direction is too long, which will increase the risk of the metal fixing strap 21 getting stuck, thereby increasing the difficulty of installation.

[0070] The battery pack 100 provided by this utility model limits the minimum distance of the metal fixing strap 21 along the vertical direction to the end plate 40 within the above-mentioned numerical range. This allows the fixing strap 20 to apply a uniform preload to the multiple battery modules 11, ensuring the overall constraint effect of the multiple fixing straps 20 on the battery module assembly 12. It also shortens the installation path of the metal fixing strap 21, thereby reducing the risk of jamming and reducing the installation difficulty of the metal fixing strap 21.

[0071] As one possible implementation, the minimum distance between the plastic fixing strap 22 and the metal fixing strap 21 in the vertical direction is D3 mm, where 65 mm ≤ D3 mm ≤ 95 mm. For example, D3 mm can be 65 mm, 68 mm, 70 mm, 72 mm, 75 mm, 78 mm, 80 mm, 82 mm, 85 mm, 88 mm, 90 mm, or 95 mm.

[0072] When the minimum distance between the plastic fixing strap 22 and the metal fixing strap 21 in the vertical direction is less than 65mm, the uniform preload applied by the two fixing straps 20 to the multiple battery modules 11 is too concentrated in the vertical direction, which is not conducive to the constraint effect on the battery module assembly 12.

[0073] When the minimum distance between the plastic fixing band 22 and the metal fixing band 21 in the vertical direction is greater than 95mm, the metal fixing band 21 is closer to the upper part of the end plate 40, while the plastic fixing band 22 is closer to the lower part of the end plate 40. As a result, the constraint of the two fixing bands 20 on the middle part of the end plate 40 is too dispersed, and the battery module assembly 12 is prone to shaking when subjected to vibration and impact.

[0074] The battery pack 100 provided by this utility model can avoid the two fixing straps 20 applying too concentrated or too dispersed uniform pre-tightening force to multiple battery modules 11 in the vertical direction by limiting the minimum distance of the plastic fixing strap 22 to the metal fixing strap 21 in the vertical direction within the above-mentioned numerical range, thereby ensuring the overall constraint effect of the multiple fixing straps 20 on the battery module assembly 12.

[0075] refer to Figure 8The metal fixing band 21 is fixed to the end plate 40 by rivets 42. Riveting the metal fixing band 21 to multiple end plates 40 can further enhance the constraint of the fixing band 20 on multiple battery modules 11. In this way, when the battery module assembly 12 is subjected to vibration, impact or internal expansion force, the riveting connection can effectively suppress the relative displacement between the end plate 40 and the metal fixing band 21, thereby improving the deformation resistance and stability of the entire battery module assembly 12 and providing a reliable guarantee for the safe operation of the battery pack 100.

[0076] Continue to refer to Figure 8 The end plate 40 has multiple lifting points 43 on the side opposite to the multiple battery modules 11. By setting the lifting points 43 on the end plate 40, a reliable force-bearing position can be provided for the installation process of the battery module assembly 12, ensuring the safety and stability of the lifting process.

[0077] refer to Figure 4 and Figure 5 The battery pack 100 also includes two bottom beams 32 spaced apart along the thickness direction, with multiple battery modules 11 located between the two bottom beams 32, and multiple end plates 40 fixed above the two bottom beams 32. The two bottom beams 32 can constrain the displacement of the multiple battery modules 11 in the thickness direction, thereby preventing the battery module assembly 12 from shaking when subjected to vibration and impact. In addition, the implementation of fixing the multiple end plates 40 above the two bottom beams 32 can maximize the utilization of the housing space 31 of the housing 30, which helps to improve the energy density of the entire battery pack 100.

[0078] refer to Figure 5 and Figure 6 The battery pack 100 also includes a positioning element 44. Each end plate 40 has a first positioning hole 45 extending vertically, and each bottom beam 32 has a second positioning hole 321. The positioning element 44 passes through the first positioning hole 45 and the second positioning hole 321 to fix the end plate 40 to the bottom beam 32. This ensures the rigidity of the connection between the end plate 40 and the bottom beam 32 and the stability of the overall structure, making it resistant to vibration and impact.

[0079] It is understood that there are many ways to implement the positioning element 44, and this utility model does not impose any particular limitation on it. As an example, the positioning element 44 can be a positioning pin or a bolt.

[0080] refer to Figure 6 The connector 60 is provided with a connecting hole 61. The positioning member 44 passes through the connecting hole 61 and the first positioning hole 45 in sequence, fixing the connector 60 to the upper side of the end plate 40. While fixing the end plate 40 to the bottom beam 32, the positioning member 44 can also fix the connector 60 to the end plate 40. This method reduces the number of parts and costs, simplifies the installation process, and thus improves installation efficiency.

[0081] refer to Figure 7 The battery pack 100 also includes a busbar 70 and terminals 80. The busbar 70 is connected to the battery module assembly 12 and the terminals 80, which are connected to external devices to enable the input and output of electrical energy.

[0082] It is understood that this utility model does not impose any particular restrictions on the materials of the busbar 70 and the terminal 80. As an example, the materials of the busbar 70 and the terminal 80 can be one of conductive materials such as aluminum and copper.

[0083] Continue to refer to Figure 7 The battery pack 100 also includes a support 90, and an end plate 40 including an upwardly opening mounting hole 46. The lower end of the support 90 is fixed to the end plate 40, and its upper end supports the connection between the busbar 70 and the terminal 80. Since the end plate 40 is located between the battery module 11 and the terminal 80, the mounting hole 46 constructed using the end plate 40 not only provides support for the support 90, but also reduces the number of components and lowers costs.

[0084] As an example, see reference Figure 8 The end plate 40 may include two substrates 47 spaced apart along the thickness direction and a reinforcing plate 48 connecting the two substrates 47. Mounting holes 46 are formed between the substrates 47 and the reinforcing plate 48. Furthermore, when the reinforcing plate 48 is more evenly distributed between the two substrates 47, the end plate 40 can form multiple mounting holes 46. This implementation not only reduces the weight of the end plate 40 but also provides flexibility for the installation of the support 90.

[0085] It should be understood that the term "comprising" and its variations used in this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0086] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first positioning hole and the second positioning hole), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0087] The scope of protection of this utility model is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, The battery pack (100) includes: The box (30) has a housing space (31) inside; Multiple battery modules (11), each battery module (11) includes multiple batteries (10), each battery (10) has a thickness direction and a width direction, the multiple batteries (10) are stacked along the thickness direction, and the multiple battery modules (11) are arranged along the width direction to be arranged into a cuboid shape and disposed in the receiving space (31); A fixing strap (20) surrounds the outer periphery of the plurality of battery modules (11) to secure the plurality of battery modules (11) together to form a battery module assembly (12); and Multiple end plates (40) are spaced apart and surrounded by the fixing strap (20) to fix them to the outer periphery of the multiple battery modules (11).

2. The battery pack (100) according to claim 1, characterized in that, Each battery module (11) has end plates (40) on both sides in the thickness direction, and the fixing strap (20) is located on the outside of the plurality of battery modules (11) in the thickness direction and on the outside of the plurality of end plates (40) in the width direction.

3. The battery pack (100) according to claim 2, characterized in that, Each end plate (40) has an arc portion (41) on the side of the end plate (40) in the width direction near the adjacent end plate (40).

4. The battery pack (100) according to claim 2, characterized in that, It also includes a heat insulation element (51) disposed between two adjacent end plates (40) in the width direction.

5. The battery pack (100) according to claim 2, characterized in that, It also includes a connector (60) extending along the width direction, the connector (60) being fixedly connected to two adjacent end plates (40) in the width direction.

6. The battery pack (100) according to claim 2, characterized in that, The number of fixing strips (20) is multiple, and the multiple fixing strips (20) are spaced apart in the vertical direction. Each fixing strip (20) surrounds the outer periphery of the multiple battery modules (11), and the vertical direction, the thickness direction and the width direction are perpendicular to each other.

7. The battery pack (100) according to claim 6, characterized in that, The fixing strap (20) includes a metal fixing strap (21) and a plastic fixing strap (22).

8. The battery pack (100) according to claim 7, characterized in that, The metal fixing strap (21) is located above the plastic fixing strap (22).

9. The battery pack (100) according to claim 8, characterized in that, In the vertical direction, the size of the end plate (40) is D1 mm, the minimum distance from the metal fixing band (21) to the end plate (40) is D2 mm, and 0.03≤D2 mm / D1 mm≤0.14; the minimum distance from the plastic fixing band (22) to the metal fixing band (21) is D3 mm, and 0.4≤D3 mm / D1 mm≤0.

65.

10. The battery pack (100) according to claim 9, characterized in that, In the vertical direction, the size of the end plate (40) is D1 mm, 140 mm ≤ D1 mm ≤ 170 mm, and / or; the minimum distance from the metal fixing band (21) to the end plate (40) is D2 mm, 5 mm ≤ D2 mm ≤ 20 mm, and / or; the minimum distance from the plastic fixing band (22) to the metal fixing band (21) is D3 mm, 65 mm ≤ D3 mm ≤ 95 mm.

11. The battery pack (100) according to claim 8, characterized in that, The metal fixing band (21) is fixed to the end plate (40) by rivets (42).

12. The battery pack (100) according to claim 2, characterized in that, The end plate (40) has multiple lifting points (43) on the side opposite to the multiple battery modules (11).

13. The battery pack (100) according to claim 2, characterized in that, The housing (30) includes two bottom beams (32) spaced apart along the thickness direction, the plurality of battery modules (11) are located between the two bottom beams (32), and the plurality of end plates (40) are fixed above the two bottom beams (32).

14. The battery pack (100) according to claim 13, characterized in that, It also includes a positioning element (44), each end plate (40) is provided with a first positioning hole (45) that runs through the vertical direction, and each bottom beam (32) is provided with a second positioning hole (321). The positioning element (44) passes through the first positioning hole (45) and the second positioning hole (321) to fix the end plate (40) to the bottom beam (32). The vertical direction, the thickness direction and the width direction are perpendicular to each other.

15. The battery pack (100) according to claim 14, characterized in that, It also includes a connector (60) extending along the width direction, the connector (60) having a connection hole (61), the positioning member (44) passing through the connection hole (61) and the first positioning hole (45) in sequence, fixing the connector (60) to the upper side of the end plate (40).

16. The battery pack (100) according to claim 2, characterized in that, It also includes a busbar (70), terminals (80) and a support (90). The busbar (70) is connected to the plurality of battery modules (11) and the terminals (80). The terminals (80) are used to connect to external devices. The end plate (40) includes an upward-facing mounting hole (46). The lower end of the support (90) is fixed to the end plate (40), and its upper end supports the connection between the busbar (70) and the terminals (80).

17. An electrical appliance (200), characterized in that, Includes the battery pack (100) according to any one of claims 1 to 16.

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