A battery pack case and a battery pack

Abstract

The utility model provides a kind of battery pack box and battery pack, battery pack box includes bottom frame, fixed bottom plate of bottom frame, the side plate being set in the both sides of bottom frame, the pair of end plate being set in the both ends of bottom frame, and the external protective cover covering whole;End plate is welded and fixed on bottom frame and / or bottom plate, and bottom frame and bottom plate are enclosed to form module containing cavity to contain electric core, and the whole frame structure design simplifies assembly process, unifies bearing structure and function space, realizes function integration and space optimization;End plate adopts hollow tubular structure, realizes the unification of lightweight and high structural stiffness. The electrical module installation area isolated from module containing cavity is formed on one side of box through end plate, optimizes space utilization while fundamentally eliminates electromagnetic interference between high-low voltage circuit and potential safety risk, realizes high degree of modularization and safety design.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack housing and a battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle and energy storage industries, increasingly stringent requirements have been placed on the energy density, safety, reliability, and production efficiency of power battery packs. Traditional battery pack enclosures mostly adopt sheet metal welding structures, which have problems such as overall bulkiness, low structural efficiency, and insufficient internal space utilization. In order to fix the cell modules, a large number of auxiliary structures such as crossbeams and longitudinal beams are often required in the enclosure, which not only increases weight and cost, but also complicates the assembly process and makes it difficult to ensure product consistency. Utility Model Content

[0003] This utility model provides a battery pack housing and a battery pack to solve technical problems such as bulky battery pack structure, low space utilization, and complex and inconsistent assembly process.

[0004] The present invention provides a battery pack housing, including a bottom frame, a bottom plate fixed to the bottom frame, side plates disposed on both sides of the bottom frame, and a pair of end plates disposed at both ends of the bottom frame.

[0005] The end plate is a hollow tubular structure, which is fixed to the bottom frame and / or the bottom plate. The bottom frame, the bottom plate and the end plate together form a module receiving cavity for accommodating the battery cell.

[0006] The enclosure has an electrical module mounting area formed by the end plate, which is isolated from the module receiving cavity.

[0007] In one embodiment of the present invention, the upper surface of the base plate is provided with a mounting groove for accommodating the heating element.

[0008] In one embodiment of the present invention, the depth of the mounting groove is configured to be deeper than the diameter or thickness of the heating element, and the heating element does not protrude from the upper surface of the base plate after being accommodated.

[0009] In one embodiment of the present invention, the mounting slot includes at least one set, and the heating element in each set of the mounting slot is independently wired.

[0010] In one embodiment of the present invention, the tubular structure of the end plate is further provided with a reinforcing structure.

[0011] In one embodiment of this utility model, the end plate is formed by splicing and welding multiple hollow tubes.

[0012] In one embodiment of the present invention, an insulating layer is provided on the inner sidewall of the end plate, and the insulating layer is configured such that it can completely cover the surface of the battery cell after the battery cell is installed.

[0013] In one embodiment of the present invention, a front panel is provided at the end of the electrical module mounting area, and the front panel has functional interface holes corresponding to the functional interfaces of the electrical module.

[0014] In one embodiment of the present invention, an external protective cover is further included, which covers and seals the module receiving cavity and the electrical module mounting area. The external protective cover is fixedly connected to the bottom frame and the front panel by bolts.

[0015] This utility model also provides a battery pack, including a battery pack housing as described in any of the above embodiments, and at least one cell module disposed in the module receiving cavity.

[0016] The beneficial effects of this utility model are as follows: The battery pack box and battery pack proposed in this utility model form an integral skeleton by welding hollow tubular end plates to the bottom frame, which achieves the unity of lightweight box, high structural rigidity and high space utilization, laying the foundation for improving the energy density of the battery pack. This structural design transforms the complex box assembly into clear assembly installation steps, optimizes the production process, significantly improves the consistency and reliability of the product, and reduces manufacturing costs.

[0017] By setting a depth-optimized mounting slot on the base plate, the space layout is optimized in conjunction with the end plate. The mounting slot adopts a zoned independent wiring strategy, which realizes refined and uniform thermal management, effectively avoids the risk of damage to the heating element, compensates for edge heat loss, and improves low-temperature performance and safety.

[0018] By using an insulation layer covering structure design, the structural stiffness and vibration modes of the battery module in the Z direction are enhanced while meeting strict electrical insulation requirements, thus extending the battery pack life.

[0019] By setting up an independent electrical module installation area and physically isolating it from the module housing cavity, strict separation of high and low voltage circuits is achieved, eliminating electromagnetic interference and potential short-circuit risks, thus constituting a system-level safety design.

[0020] The modular and platform-based design gives the enclosure a high degree of scalability and flexibility, and greatly improves the maintainability of the product. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic diagram of the internal structure of a battery pack according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the battery pack housing provided in one embodiment of the present invention;

[0025] Figure 3 This is a partial structural diagram of the battery pack housing provided in one embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the mounting groove of the base plate provided in one embodiment of the present invention.

[0027] The attached figures are labeled as follows:

[0028] 100. Bottom frame; 200. Base plate; 210. Mounting slot; 300. Side plate; 400. End plate; 500. External protective cover; 600. Module receiving cavity; 700. Electrical module installation area; 710. Front panel; 800. Insulation layer; 900. Battery cell module. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0032] With the rapid development of the new energy vehicle industry, higher requirements have been placed on the energy density, safety, and production efficiency of power battery packs. Traditional battery packs suffer from problems such as bulky structure, low space utilization, and complex assembly processes, necessitating a new type of enclosure solution to systematically address these issues.

[0033] Please see Figures 1 to 4 This utility model provides a battery pack housing, mainly including a bottom frame 100, a base plate 200 fixed to the bottom frame 100, side plates 300 disposed on both sides of the bottom frame 100, a pair of end plates 400 disposed at both ends of the bottom frame 100, and an external protective cover 500 covering the entire structure. The pair of end plates 400 are directly welded and fixed to the bottom frame 100 and / or the base plate 200, forming a module housing cavity 600 for accommodating battery cells together with the bottom frame 100 and the base plate 200. This pre-connected integral skeleton structure design simplifies the assembly process, integrates the load-bearing structure and functional space, eliminates the redundant beam structure in traditional designs, and achieves functional integration and space optimization. The end plates 400 adopt a hollow tubular structure, achieving a balance between lightweight and high structural rigidity. An electrical module mounting area 700, isolated from the module receiving cavity 600, is formed on one side of the enclosure via an end plate 400. The independently set electrical module mounting area 700 and the module receiving cavity 600 are physically strictly isolated, which fundamentally eliminates electromagnetic interference and potential safety risks between high and low voltage circuits, and achieves a high degree of modularity and safety design.

[0034] Please see Figures 1 to 4In the battery pack housing of this utility model, the end plate 400 integrates functions such as load-bearing, forming, and support, serving as a core basic component and reconstructing the assembly process and system functional layout. The structural design of the end plate 400 achieves a balance between lightweight design and high structural rigidity, as well as functional integration and space optimization. The overall frame is pre-manufactured and precision-calibrated as an independent sub-assembly; subsequent components are installed based on this frame, streamlining the assembly process, improving product consistency, and avoiding the cumbersome process of fixing individual components, resulting in more efficient and reliable assembly. The excellent performance of the housing frame and the modular partitioning design within the housing also effectively enhance the safety and reliability of the battery pack. Through integrated structural design and multi-functional integration and optimization, synergistic progress has been achieved in lightweighting, structural strength, production and assembly efficiency, safety, and thermal management performance.

[0035] Please see Figures 1 to 4 In one optional embodiment, the upper surface of the base plate 200 is precision-machined with a plurality of mounting grooves 210. These mounting grooves 210 are specifically designed to accommodate strip-shaped heating elements, such as metal heating wires or silicone heating sheets. Specifically, the depth of the mounting grooves 210 is configured to be deeper than the diameter or thickness of the heating element itself, so that the heating element does not protrude from the upper surface of the base plate 200 after being accommodated. This ensures that after the heating element is embedded in the mounting groove 210, its top can be completely located within the groove. This effectively avoids the risk of short circuits or failures caused by pressure damage or scratches to the heating element due to the installation of epoxy boards or battery cells during subsequent assembly, thereby improving the reliability and safety of the system. By embedding the heating element within a precision mounting slot on the base plate, the traditional independent heating film's fixing structure and installation steps are eliminated. The heating element, thermally conductive adhesive, and the epoxy board covering it together form a highly integrated planar thermal management module with the base plate. While providing efficient and uniform heating, its own thickness is minimized, occupying almost no additional Z-axis space. The integrated skeleton design with the end plate and bottom frame optimizes the spatial layout of the battery pack housing to the extreme. Under the same external dimensions, it can provide more effective space for the cells, directly improving the system energy density of the battery pack. At the same time, the significant reduction in the number of parts and the high integration of assembly steps also significantly simplify the final assembly process, reduce manufacturing costs, and improve production efficiency and product consistency.

[0036] Please see Figures 1 to 4In one optional embodiment, the mounting slots 210 include at least one set, and the heating elements within each set of mounting slots 210 are independently wired. Specifically, for example, for large battery packs, multiple sets of mounting slots 210 on the base plate 200 can be planned as multiple independent wiring areas, thereby realizing a zoned and independently controlled heating strategy. This design allows the battery management system (BMS) to perform differentiated temperature management on modules in different areas of the battery pack, effectively improving the end temperature difference problem caused by excessively long heating wires. At the same time, shorter independent heating circuits also reduce the installation difficulty caused by accumulated manufacturing tolerances, improving production yield and thermal management accuracy.

[0037] Please see Figures 1 to 4 In an optional embodiment, to further optimize the thermal management system and ensure its long-term reliability, after the heating element is placed in the mounting slot 210, an epoxy board is placed on top of it. The size of the epoxy board matches the base plate 200, completely covering the mounting slot 210 and the heating element. The epoxy board is bonded and fixed to the base plate 200 and the heating element in the slot by a high thermal conductivity structural adhesive layer coated on the lower surface. Utilizing the excellent electrical insulation properties of the epoxy board itself, the completely covered structure provides comprehensive insulation protection for the heating element below, completely eliminating the risk of short circuits caused by possible contact between the metal casing of the heating element and the battery cell or housing, greatly improving system safety. The high thermal conductivity structural adhesive layer fills all microscopic air gaps between the heating element and the epoxy board, as well as within the mounting slot 210, forming an efficient heat conduction path from the heating element to the epoxy board, significantly reducing interface thermal resistance and improving thermal response speed and heating efficiency. The design of the epoxy board also provides a flat, robust, and insulated mounting surface for the battery cell above, ensuring the stability and consistency of the battery cell stack.

[0038] Please see Figures 1 to 4In one optional embodiment, to address the technical challenge of uneven internal temperature distribution within the battery pack due to edge heat loss in low-temperature environments (e.g., high temperature at the center and low temperature around the perimeter), the extension path of the mounting groove 210 can be designed as an asymmetrical serpentine path. Specifically, in the "cold zones" near the side walls of the housing and the bottom frame 100, where heat dissipation is easier and temperatures are lower, the wiring density of the serpentine path is designed to be relatively higher, for example, with a longer heating wire length per unit area; while in the "hot zone" at the center of the battery pack, the wiring density is relatively lower. This carefully planned, variable-density asymmetrical wiring pattern based on thermal field simulation allows the heating element to release more heat in the cold zones to compensate for faster heat loss in those areas, resulting in a more uniform heat flow distribution to the entire bottom surface of the module. This effectively reduces the temperature difference within the module, improves the consistency and effectiveness of low-temperature heating performance, and avoids the negative impact of localized overcooling or overheating on the healthy lifespan of the battery cells. Understandably, depending on the specific thermal requirements of different customers or different application conditions, the mounting slot 210 can also be designed with different shapes and structures to accommodate heating elements of different power, which is highly flexible. The same cabinet platform can be quickly adapted to different thermal management power requirements by changing the base plate 200 components, and has good platform expansion capabilities.

[0039] Please see Figures 1 to 4 In one optional embodiment, the end plate 400 includes a first end plate and a second end plate. The first end plate is fixed to the end of the bottom frame 100 to optimize space utilization. The second end plate is arranged opposite to the first end plate. The position of the second end plate is designed in conjunction with the module structure and the box size. The second end plate forms mutually isolated module receiving cavities 600 and electrical module mounting areas 700 within the box, ensuring safe isolation while reducing the occupation of redundant structures in the internal space of the battery pack. The end plate 400 adopts a hollow tubular structure, effectively achieving overall lightweighting of the battery pack. The tubular structure is preferably a metal square tube with a rectangular or square cross-section. Its specific parameters such as tube wall thickness and cross-sectional dimensions can be optimized and selected through computer-aided engineering (CAE) simulation analysis according to the overall structural strength requirements. By adopting a hollow tubular structure, while ensuring the bending and torsional section modulus, the amount of material used is greatly reduced, fundamentally achieving lightweighting. As the main load-bearing skeleton, it transforms the box into a spatial frame structure, making the mechanical model more efficient and significantly improving the overall stiffness and modal characteristics. By utilizing the end plate 400 of the enclosure as both a load-bearing component and the module cavity wall, redundant structures such as reinforcing beams and side beams that are independent of the module in traditional designs are eliminated, greatly improving the space utilization rate inside the enclosure and laying the foundation for increasing the energy density of the battery pack. This simplifies the structure while achieving better functionality.

[0040] Please see Figures 1 to 4In an optional embodiment, to further improve the bending and compressive strength of the housing under specific working conditions, a reinforcing structure can be added inside the tubular structure of the end plate 400. Specifically, for example, longitudinal or cross-welded ribs, i.e., reinforcing ribs, can be provided on the inner wall of the tube, or lightweight foam metal materials can be filled inside the tube. This internal reinforcement can cope with the huge thrust generated by the cyclic expansion of the battery cell, thereby ensuring a safety margin for the structure while achieving extreme lightweighting.

[0041] Please see Figures 1 to 4 In one optional embodiment, each end plate 400 can be spliced ​​and welded from multiple hollow tubes. Specifically, depending on the length of the battery pack, the end plate 400 on one side can be made of a single square tube or multiple hollow tubes spliced ​​and welded together by welding. The specific number of splices, welding methods, and corresponding internal reinforcement schemes are all ultimately determined based on the evaluation results of the overall mechanical performance in the CAE simulation report. Scientific design is carried out based on simulation to ensure the overall structural strength and rigidity.

[0042] Please see Figures 1 to 4 In one optional embodiment, an insulating layer 800 is provided on the inner wall of the module receiving cavity 600, i.e., the inner wall surface of the end plate 400 facing the battery cell. The insulating layer 800 may be made of, for example, epoxy resin board or similar high-performance insulating material. The insulating layer 800 is configured to completely cover the surface of the battery cell after it is installed. After the battery cell is installed in the module receiving cavity 600, the insulating layer 800 provides the necessary electrical isolation between the battery cell and the metal structure of the housing, meeting stringent safety requirements. It is understood that side plates 300 are used for support and protection on both sides of the module. The side plates 300 may be sheet metal welded to the end plate 400, ensuring structural strength and stability while achieving a lightweight design. An insulating layer 800 is also provided between the side plates 300 and the battery cell to ensure insulation between them and the battery cell, improving safety. Furthermore, an insulating layer 800 is also provided at the top edge of the cell, which avoids the busbar installation area and covers the top corner and part of the top surface of the cell. Together with the side insulating layers 800, it forms an L-shaped encapsulation structure for the entire cell, forming an insulating frame that binds the cell. The insulating layer 800 is bonded to the sides and top surface of the cell with high-strength structural adhesive, connecting the cell to the robust overall frame as a mechanical whole. This greatly enhances the structural rigidity of the entire battery module in the direction perpendicular to the base plate 200 (Z direction), significantly improves the vibration modes of the battery pack, effectively suppresses the axial expansion of the cell during charging and discharging, and solves the problems of lifespan degradation and safety hazards caused by cell shaking and expansion. It achieves the integration of insulation and structural reinforcement functions.

[0043] Please see Figures 1 to 4In one optional embodiment, a front panel 710 is encapsulated at the end of the electrical module mounting area 700. This front panel 710 serves as the interface for connecting and interacting with external devices, and it has several functional interface holes corresponding to the functional interfaces of the internal electrical modules. These interface holes include, for example, charging holes for connecting a DC charging gun, low-voltage communication interface holes for vehicle communication control, and status indicator holes for displaying system status. Integrating various interfaces into the front panel 710 facilitates user operation and connection, and improves the overall aesthetics of the product.

[0044] Please see Figures 1 to 4 In one optional embodiment, the front panel 710 is connected to the bottom frame 100, serving as a reference component for the electrical module sub-assembly. Together with electrical interface components, it forms a complete, independently testable electrical functional module. The modular design allows for comprehensive functional testing of the module before it is installed in the enclosure, greatly facilitating troubleshooting and rework during production, significantly improving production yield and efficiency. Simultaneously, the separate connection of the front panel 710 facilitates system sealing and reliability, optimizes assembly processes, and allows for quick modular replacement of the front panel 710 during subsequent maintenance without requiring extensive disassembly of the enclosure's interior or other components.

[0045] Please see Figures 1 to 4 In one optional embodiment, the enclosure is ultimately sealed by a large external protective cover 500. After all internal modules and electrical components are installed, the external protective cover 500 covers and seals the module receiving cavity 600 and the electrical module mounting area 700. This external protective cover 500 is typically formed by stamping metal sheet, and its shape is adapted to the overall frame. It covers the bottom frame 100 and the front panel 710, and is fixedly connected to the bottom frame 100 and the front panel 710 by bolts or other detachable fasteners. This detachable connection facilitates later maintenance and repair of the battery pack. Simultaneously, its complete outer shell constitutes the final physical and environmental protection barrier for the battery pack, providing a level of protection guarantee.

[0046] Please see Figures 1 to 4 This utility model also provides a battery pack, which includes the battery pack housing described in any of the above embodiments, and at least one cell module 900 disposed within the module receiving cavity 600. The cell module 900 is composed of multiple cells connected in series and parallel. Through the excellent mechanical, thermal management, and safety performance design of the battery pack housing, the energy density, safety, and service life of the battery pack are improved.

[0047] Please see Figures 1 to 4In one optional embodiment, the overall frame structure design of the enclosure has a high degree of platform scalability. Specifically, by flexibly adjusting the number and spacing of the end plates 400 welded to the bottom frame 100 and the base plate 200, the enclosure structure can be expanded to accommodate different numbers and sizes of battery cell modules 900, as well as schemes containing multiple battery cell modules 900 arranged in parallel. For example, two or more end plates 400 can be welded to the base plate 200, thereby dividing the module housing cavity 600 into two or more independent sub-cavities. Each sub-cavity can accommodate a complete battery cell module 900. Expansion gaps can be left between each module as thermal isolation and expansion buffers. Additional insulating partitions can also be added in these gaps to achieve a higher level of electrical isolation and thermal runaway protection.

[0048] In summary, the battery box and battery pack of this utility model achieve a unified balance of lightweight, high rigidity, and high space utilization through an integral frame formed by welding a hollow tubular end plate 400 and a bottom frame 100. Simultaneously, the bottom plate 200 integrates a mounting groove 210 and houses heating elements. The integrated frame and modular assembly process optimize the production process, significantly improving product consistency and reliability. Through integrated, refined, and functionally unified design, uniform thermal management and enhanced safety are achieved, comprehensively ensuring the high safety and long lifespan of the battery pack. The modular design offers high scalability and flexibility, allowing for the development of models with different capacities and power ratings, and significantly improving product maintainability. The close synergy and mutual enhancement of various technical features achieve a balance between lightweight and high strength while effectively improving the battery's energy density and safety performance.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0050] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0051] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0052] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0053] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0054] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0055] The above description of the embodiments shown in this utility model (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the utility model.

[0056] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0057] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A battery pack case characterized by, The battery pack case comprises a bottom frame, a bottom plate fixed to the bottom frame, side plates arranged on both sides of the bottom frame, and a pair of end plates arranged at both ends of the bottom frame; The end plate is a hollow tubular structure fixed to the bottom frame and / or the bottom plate, and the bottom frame, the bottom plate and the end plate together form a module accommodating cavity for accommodating the battery cell; One end of the case is formed with an electrical module mounting area isolated from the module accommodating cavity by the end plate.

2. The battery pack enclosure of claim 1, wherein, The upper surface of the bottom plate is provided with a mounting groove for accommodating the heating element.

3. The battery pack enclosure of claim 2, wherein, The mounting groove is configured to have a depth greater than the diameter or thickness of the heating element, and the heating element does not protrude from the upper surface of the bottom plate after being accommodated.

4. The battery pack enclosure of claim 3, wherein, The mounting groove includes at least one group, and the heating elements in each group are independently wired.

5. The battery pack enclosure of claim 1, wherein, The tubular structure of the end plate is further provided with a reinforcing structure.

6. The battery pack enclosure of claim 1, wherein, The end plate is made of a plurality of hollow pipes spliced and welded.

7. The battery pack enclosure of claim 1, wherein, The inner side wall of the end plate is provided with an insulation layer, which is configured to completely cover the surface of the battery cell after the battery cell is installed.

8. The battery pack enclosure of claim 1, wherein, The end of the electrical module mounting area is provided with a front panel, and the front panel is provided with a functional interface hole corresponding to the functional interface of the electrical module.

9. The battery pack enclosure of claim 1, wherein, Further comprising an external protective cover covering and sealing the module accommodating cavity and the electrical module mounting area, and the external protective cover is fixedly connected with the bottom frame and the front panel by bolts.

10. A battery pack, characterized by, The battery pack case comprises a bottom frame, a bottom plate fixed to the bottom frame, side plates arranged on both sides of the bottom frame, and a pair of end plates arranged at both ends of the bottom frame;

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