Battery pack assembly and manufacturing method of battery pack

Abstract

The invention provides a battery pack assembly and a manufacturing method of a battery pack, and relates to the technical field of batteries, the battery pack assembly comprises a box body, a fixed bending plate and a plurality of battery cells, the box body is provided with a bottom plate and a surrounding plate surrounding the periphery of the bottom plate, and the bottom plate and the surrounding plate form a first concave cavity; the fixed bent plate comprises a fixed part and a first bent part, the first bent part is connected to the top end of the fixed part, an included angle is formed between the first bent part and the fixed part, and the fixed part is fixed in the first concave cavity and is parallel to the length direction of the bottom plate to form a plurality of containing longitudinal cavities; two fixed bent plates which are arranged in a back-to-back manner are arranged between every two adjacent accommodating longitudinal cavities; the battery cell is accommodated in the accommodating longitudinal cavity, and the first bending part extends towards the direction of the battery cell, so that the battery cell is clamped in the accommodating longitudinal cavity. When the battery cells are sequentially arranged and accommodated in the accommodating longitudinal cavities, the battery cells can be fixed in the accommodating longitudinal cavities by the first bending plates on the fixed bending plates, so that the space in the box body is saved, the energy density is improved, and the weight of the whole battery pack is also reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack assembly and a method for manufacturing a battery pack. Background Art

[0002] With the technological development of the new energy industry, the development of electric vehicles has received more and more attention. As the power source of electric vehicles, battery packs are constantly evolving from traditional module solutions to large module solutions, and even to non-module CTP (Cell to Pack) solutions. The current mainstream CTP solution is to stack the battery cells outside the box first, clamp them to the designed size with a fixture, and then place the grouped battery cells in the box and fix them by gluing and other methods. As a result, there is no need to set up a shell to package the battery cells to form a battery module. On the premise that the safety of the battery cells is guaranteed, CTP technology reduces internal cables and structural parts, thereby improving the volume energy density and weight energy density of the entire battery pack.

[0003] However, the existing CTP solution has high requirements for fixtures and equipment. As the battery pack sizes of different projects vary, fixtures and other equipment cannot be universal, resulting in increased costs, and the integration efficiency of battery packs needs to be improved.

[0004] Therefore, there is an urgent need to provide a battery pack assembly or a method for manufacturing a battery pack that can save manufacturing costs and improve the integration efficiency of the battery pack. Summary of the invention

[0005] The present application provides a battery pack assembly and a method for manufacturing a battery pack, which can eliminate the cross beams and longitudinal beams in a traditional CTP battery pack, making the battery module arrangement more compact, thereby solving the problems of high cost and low integration efficiency and improving the energy density of the battery pack.

[0006] In the first aspect, the present application provides a battery pack assembly, including: a box body, the box body having a bottom plate and a surrounding plate surrounded by the bottom plate, the bottom plate and the surrounding plate constitute a first concave cavity; a fixed bending plate, the fixed bending plate is arranged in the first concave cavity and is arranged parallel to the length direction of the bottom plate to form a plurality of accommodating longitudinal cavities, the fixed bending plate includes a fixed portion and a first bending portion, the first bending portion is connected to the top end of the fixed portion, the first bending portion and the fixed portion form an angle, and two adjacent accommodating longitudinal cavities are provided with two back-to-back fixed bending plates; a plurality of battery cells, the battery cells are arranged in sequence and accommodated in the accommodating longitudinal cavities, the first bending portion extends toward the direction of the battery cells to clamp the battery cells in the accommodating longitudinal cavities.

[0007] Through the above scheme, the box body is composed of a bottom plate and a surrounding plate enclosed around the bottom plate to form a first concave cavity. The fixed bending plate is fixed in the first concave cavity through the design of its fixed part and the first bending part to form a plurality of accommodating longitudinal cavities, in which the battery cells are arranged and accommodated in sequence. In this design, the fixed part of the fixed bending plate plays the role of separating the battery cell groups, which is equivalent to the function of the longitudinal beam, and the first bending part can fix the plurality of battery cells in the accommodating longitudinal cavity. Therefore, it is not necessary to pack the plurality of battery cells into battery cell groups and other fixing and connecting methods. All battery cells can be fixed in the accommodating longitudinal cavity by the first bending plate. Therefore, there is no need to design additional longitudinal beams and cross beams for the box body. Since the thickness of the fixed bending plate is thinner than that of the traditional longitudinal beams and cross beams, this design not only saves space in the box body, improves energy density, but also reduces the weight of the entire battery pack. At the same time, the arrangement between the battery cells is more compact, making the overall structure of the battery pack more stable. Furthermore, by adopting the design of the fixed bending plate, individual battery cells can be placed into the box body one by one during the installation process. This means that there is no need to use complicated stacking and lifting equipment during the production process, which not only saves manufacturing costs but also significantly improves production efficiency.

[0008] In a possible design, the fixing portion includes a partition portion and a second bent portion, the second bent portion is connected to the bottom end of the partition portion, and the second bent portion extends toward the direction of the battery cell; the first bent portion, the partition portion and the second bent portion constitute a second concave cavity, and when the battery cell is accommodated in the accommodating longitudinal cavity, part of the battery cell is stuck in the second concave cavity.

[0009] Through the above scheme, the design of the second bending portion and the second cavity enables the fixing portion to be more firmly fixed on the bottom plate, and the battery cell is also more firmly fixed in the accommodating longitudinal cavity. Part of the structure of the battery cell is stuck in the second cavity, which can effectively prevent the displacement and vibration of the battery cell during use, thereby significantly improving the overall stability and reliability of the battery pack. In addition, the design achieves the fixation and separation of the battery cell through the ingenious structure of the bending plate without the need for additional complex structural parts or adhesives. This not only simplifies the structure of the battery pack, but also reduces the manufacturing cost and process complexity. The way the battery cell is fixed in the second cavity increases the protection of the battery cell to a certain extent and reduces the risk of damage caused by collision or impact. At the same time, this fixing method makes the disassembly and replacement of the battery cell more convenient, significantly improving the maintainability of the battery pack.

[0010] In a possible design, the fixed bending plate further includes a third bending portion, which is connected to the first bending portion and forms an angle with the first bending portion.

[0011] Through the above scheme, during the assembly of the battery cell, the third bent portion can be used as a fulcrum to facilitate the breaking of the fixed bent plate, thereby facilitating the assembly of the battery cell into the accommodating longitudinal cavity. The design of the third bent portion provides convenience for the assembly of the battery cell. During the assembly process, the operator can use the third bent portion as a fulcrum to easily break the fixed bent plate apart, thereby more conveniently placing the battery cell into the accommodating longitudinal cavity. This greatly simplifies the assembly process and improves production efficiency. When the battery cell needs to be replaced or maintained, the third bent portion can also be used as a fulcrum to facilitate the operator to quickly disassemble and reassemble the battery cell. This design not only improves the maintainability of the battery pack, but also reduces maintenance costs.

[0012] In a possible design, a buffer structure is further provided between the partition portion and the battery cell, and the buffer structure is fixed on the partition portion.

[0013] Through the above solution, the buffer structure can effectively absorb and disperse the vibration and impact force of the battery cell during use, reduce the displacement or damage of the battery cell caused by external forces, and thus improve the stability and reliability of the battery cell. The buffer structure can reduce the stress caused by expansion or contraction of the battery cell during the charge and discharge cycle, reduce fatigue and damage to the internal structure of the battery cell, and thus extend the service life of the battery cell.

[0014] In a possible design, a pressing block structure is also included, which includes an insertion portion and a pressing shoulder portion. The pressing shoulder portion is perpendicular to the insertion portion, and the insertion portion is inserted between two fixed bending plates between two adjacent accommodating longitudinal cavities. The pressing shoulder portion extends toward the direction of the battery cell and its two ends are respectively against the third bending portion.

[0015] Through the above scheme, the insertion part of the block structure is inserted between two adjacent fixed bending plates, forming an integrated structure with the fixed bending plates, thereby enhancing the structural strength of the entire battery pack. At the same time, the cooperation between the shoulder and the third bending part further improves the stability of the overall structure and reduces the risk of structural deformation caused by external forces. The design of the block structure makes the battery cells more compactly arranged in the accommodating longitudinal cavity and reduces the gaps between the battery cells. This compact layout not only improves the volume energy density of the battery pack, but also further optimizes the space utilization, so that the battery pack can accommodate more battery cells, thereby improving the overall performance. The design of the block structure makes the assembly and disassembly of the battery cells more convenient. During assembly, the insertion part can be quickly inserted between the fixed bending plates, and the shoulder can be directly pressed on the upper surface of the battery cell and against the third bending part, without the need for complex fixing tools or adhesives. During disassembly, the battery cell can be easily removed by simply lifting the block structure, which greatly simplifies the operation process, improves production efficiency, and reduces manufacturing costs. The matching design of the block structure and the third bending part is not only suitable for battery cells of different sizes, but can also be adjusted and optimized according to specific needs. This design enhances the versatility and adaptability of battery pack components, enabling them to better meet diverse needs.

[0016] In a possible design, the end of the insertion portion is configured as a chamfered structure; and the length of the insertion portion is less than or equal to the height of the battery cell.

[0017] Through the above scheme, the chamfered structure at the end of the insertion part can effectively reduce the friction and resistance between the insertion part and the fixed bending plate during the assembly process, making it easier for the insertion part to be inserted between two adjacent fixed bending plates. This design significantly improves the assembly efficiency and reduces the risk of jamming or damage that may occur during the assembly process. The chamfered structure provides a guiding slope for the insertion part, which can ensure that the insertion part accurately enters the predetermined position during assembly and avoids structural deformation or damage caused by improper assembly. This not only improves the assembly accuracy, but also enhances the overall reliability of the battery pack. The length of the insertion part determines the insertion depth. The deeper the insertion, the more stable the assembly. However, the shorter the length of the insertion part, the lighter the overall weight and the overall weight of the battery pack. Therefore, the length of the insertion part is designed to be less than or equal to the height of the battery cell, so that the block structure will not exceed the height range of the battery cell after assembly. This design further optimizes the internal space layout of the battery pack, avoids unnecessary space occupation, and thus improves the volume energy density of the battery pack.

[0018] In a possible design, the extension distance of the first bent portion toward the battery core is a first distance, the distance between the two fixed bent plates between two adjacent accommodating longitudinal cavities is a second distance, and the second distance is greater than the first distance.

[0019] According to the above scheme, during the battery assembly process, the first bending part needs to be opened clockwise or counterclockwise, and the connection between the first bending part and the fixed part is used as the axis. In order for the first bending part to be opened smoothly, sufficient avoidance space is required. Therefore, the second distance (the distance between two adjacent fixed bending plates) is set to be greater than the first distance (the extension distance of the first bending part toward the battery cell) during design.

[0020] In a possible design, a protective sheet is further included, and two sides of the battery cell facing the fixed bending plate are respectively the first side surface and the second side surface of the battery cell, and the protective sheet is fixed to the first side surface and the second side surface of the battery cell.

[0021] Through the above scheme, the protective sheet is fixed on the first side and the second side of the battery cell, which can effectively prevent the blue film of the battery cell from being damaged and avoid internal short circuits caused by damage to the blue film. This design can also prevent the battery cell from being mechanically damaged during assembly, use or maintenance, such as scratches, collisions or extrusion. These protective measures help to extend the service life of the battery cell and improve its reliability. In addition, the protective sheet can prevent direct contact between the battery cell and the fixed bending plate or other metal parts, thereby reducing the risk of short circuit. The protective sheet can also buffer the stress of the battery cell when it is impacted to a certain extent, reduce damage to the internal structure caused by external force, and further improve the safety of the battery pack. Since the protective sheet corresponds to a single battery cell one by one, that is, the first side and the second side of each battery cell are correspondingly provided with a protective sheet, this makes directional maintenance of a single battery cell possible, thereby improving the maintainability of the battery pack.

[0022] In one possible design, the protective sheet includes a protective main plate and a first isolation plate. The protective main plate is attached to the first side or the second side of the battery cell. The first isolation plate is connected to the top of the protective main plate. The first isolation plate includes a first protective sheet that is attached to a portion of the upper surface of the battery cell.

[0023] Through the above solution, the protective main body plate is attached to the side of the battery cell to provide side protection; the first isolation plate is attached to part of the upper surface of the battery cell to further protect the top of the battery cell. This design can effectively prevent the battery cell from mechanical damage during assembly, use or maintenance, such as scratches, collisions or extrusion, and avoid internal short circuits caused by damage to the blue film.

[0024] In a possible design, the first isolation plate also includes a second protective sheet and a third protective sheet, the second protective sheet is connected to the first protective sheet, the third protective sheet is connected to the second protective sheet, and the first protective sheet, the second protective sheet and the third protective sheet form a third concave cavity; the bottom end of the protective main body plate is also connected to a second isolation plate, and the second isolation plate extends toward the direction of the battery cell.

[0025] Through the above scheme, when the battery cell is assembled in the accommodating longitudinal cavity, the first bent portion extends toward the direction of the battery cell, and the battery cell is clamped in the accommodating longitudinal cavity. Due to the third concave cavity formed by the first protective sheet, the second protective sheet and the third protective sheet, the first bent portion is located in the third concave cavity, thereby providing better protection and isolation. This not only increases the creepage distance, but also avoids short circuits between the battery cell assembly (such as the bar sheet area) and the fixed bending plate. In addition, the second isolation plate extends toward the direction of the battery cell, which can provide protection under the battery cell to prevent the battery cell from mechanical damage (such as scratches, collisions or extrusion).

[0026] In the second aspect, the present application provides a method for manufacturing a battery pack, comprising the steps of: providing a box body, the box body having a bottom plate and a surrounding plate surrounding the bottom plate, the bottom plate and the surrounding plate forming a first concave cavity; providing a fixed bending plate, the fixed bending plate comprising a fixed portion and a first bending portion, the first bending portion being connected to the top end of the fixed portion, and the first bending portion and the fixed portion forming an angle; fixing the fixed portion in the first concave cavity, and arranging it parallel to the length direction of the bottom plate to form a plurality of accommodating longitudinal cavities, with two fixed bending plates between two adjacent accommodating longitudinal cavities; by bending the first bending portion in a clockwise or counterclockwise direction, and placing a plurality of battery cells in the accommodating longitudinal cavities in sequence.

[0027] The beneficial effects of the manufacturing methods provided in the above-mentioned second aspect and each possible design of the above-mentioned second aspect can be referred to the beneficial effects brought about by the above-mentioned first aspect and each possible implementation method of the first aspect, and will not be repeated here.

[0028] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of a battery pack assembly provided in accordance with an embodiment of the present application.

[0031] Figure 2 for Figure 1 Magnified view of area A in the middle.

[0032] Figure 3 A schematic diagram of a structure in which a protective sheet is provided on a single battery cell provided in an embodiment of the present application.

[0033] Figure 4 A schematic diagram of a compression block structure provided in one embodiment of the present application.

[0034] Figure 5 A schematic diagram of installing a battery cell into a longitudinal cavity according to an embodiment of the present application.

[0035] Figure 6 This is a schematic diagram of installing a pressing block structure after a battery cell is installed into a longitudinal cavity according to an embodiment of the present application.

[0036] Figure 7 A schematic diagram of the installed pressing block structure of the battery pack provided in one embodiment of the present application.

[0037] Figure 8 for Figure 7 Schematic diagram of the structure along the section line CC1.

[0038] Fig. 9 for Figure 8 Magnified view of area B in the middle.

[0039] Description of reference numerals:

[0040] 100, box body; 101, bottom plate; 102, enclosure; 103, plastic end plate; 110, fixed bending plate; 111, partition part; 112, second bending part; 113, first bending part; 114, third bending part; 120, pressing block structure; 121, insertion part; 122, shoulder pressing part; 130, accommodating longitudinal cavity; 200, battery cell; 210, protective sheet; 211, protective main body plate; 212, first protective sheet; 213, second protective sheet; 214, second isolation plate; 220, bar plate area; 300, buffer structure; area A; section line CC1; area B; first distance L1; second distance L2. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0043] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0045] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0047] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0048] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier, such as a fixed connection through screws, bolts or other barrier; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0049] CTP (Cell to Pack) is a battery integration technology, mainly used in the field of new energy vehicles. Its core is to skip the module link in the traditional battery pack and directly integrate the battery cell into the battery pack.

[0050] In the CTP solution of related technologies, the fixation method of the battery cell usually relies on structural adhesive or complex mechanical fixing structure, which makes the design and use of the fixture complicated and costly. The battery pack sizes of different projects are different, resulting in the inability to use the fixture universally, which increases equipment investment and maintenance costs.

[0051] In view of this, the embodiments of the present application provide a battery pack assembly and a method for manufacturing a battery pack. There is no need to design cross beams and longitudinal beams in the box body. The box body is fixed to the bottom plate by a fixed bending plate to form a longitudinal cavity. When the battery cells are arranged in sequence and accommodated in the longitudinal cavity, they can be fixed in the longitudinal cavity by the first bending plate on the fixed bending plate. Therefore, there is no need to use complex stacking and lifting equipment during the production process, and the space in the box body is saved, the energy density is improved, and the weight of the entire battery pack is reduced, which not only saves manufacturing costs, but also significantly improves production efficiency.

[0052] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0053] Figure 1 A schematic diagram of a battery pack assembly provided for this embodiment. Figure 2 for Figure 1 Enlarged view of area A in the middle. Please refer to Figure 1 This embodiment provides a battery pack assembly, including a box body 100, a fixed bending plate 110 and a plurality of battery cells 200.

[0054] The box body 100 comprises a bottom plate 101 and a surrounding plate 102 surrounding the bottom plate 101 , and the bottom plate 101 and the surrounding plate 102 form a first concave cavity.

[0055] The fixed bending plate 110 is arranged in the first concave cavity and is arranged parallel to the length direction of the bottom plate 101 to form a plurality of accommodating longitudinal cavities 130. The fixed bending plate 110 includes a fixed portion and a first bending portion 113. The first bending portion 113 is connected to the top end of the fixed portion. The first bending portion 113 forms an angle with the fixed portion. There are two back-to-back fixed bending plates 110 between two adjacent accommodating longitudinal cavities 130.

[0056] It can be understood that two opposite fixed bending plates 110 form a longitudinal accommodating cavity 130. Then, two adjacent longitudinal accommodating cavities 130 are provided with two fixed bending plates 110 disposed in opposite directions.

[0057] The battery cells 200 are arranged in sequence and accommodated in the accommodating longitudinal cavity 130 . The first bent portion 113 extends toward the battery cells 200 to clamp the battery cells 200 in the accommodating longitudinal cavity 130 .

[0058] The first bending portion 113 in this embodiment is a whole piece. Therefore, the first bending portion 113 is bent relative to the fixing portion toward the battery cell 200 , so that the battery cell 200 can be stably confined in the accommodating longitudinal cavity 130 .

[0059] In some embodiments, the first bending portion 113 is in the shape of a plurality of discrete pieces that are independently bent toward the corresponding battery cells 200, and the plurality of discrete pieces are arranged intermittently, for example, in the shape of a fish bone, and a plurality of sheet units are distributed on both sides of the fixing portion, and the overall arrangement is similar to the ribs of a fish bone. Each discrete piece clamps the corresponding battery cell 200 in the accommodating longitudinal cavity 130. While ensuring the limited capacity of the battery cell 200, the weight of the entire battery pack can also be reduced.

[0060] The material of the fixed bending plate 110 can be an extruded profile made of aluminum alloy, high-strength steel or carbon fiber composite material.

[0061] The thickness of the fixed bending plate 110 is 1 mm-10 mm, which can greatly reduce the space occupancy rate inside the battery pack.

[0062] Through the above scheme, the first concave cavity in the box body 100 is only composed of the bottom plate 101 and the surrounding plate 102 enclosed around the bottom plate 101, and the overall structure is simple and light. The fixed bending plate 110 is fixed in the first concave cavity through the design of its fixed part and the first bending part 113, forming a plurality of accommodating longitudinal cavities 130, and the battery cells 200 are arranged and accommodated in sequence. In this design, the fixed part of the fixed bending plate 110 plays the role of separating the battery cell 200 groups, which is equivalent to the function of the longitudinal beam, and the first bending part 113 can fix the plurality of battery cells 200 in the accommodating longitudinal cavity 130, so there is no need to pack the plurality of battery cells 200 into a battery cell 200 group or other fixing and connecting methods, and all battery cells 200 can be fixed in the accommodating longitudinal cavity 130 by the first bending plate. Therefore, there is no need to design additional longitudinal beams and cross beams for the box body 100. Since the thickness of the fixed bending plate 110 is thinner than the traditional longitudinal beam and cross beam, this design not only saves space in the box 100, improves energy density, but also reduces the weight of the entire battery pack. At the same time, the arrangement of the battery cells 200 is more compact, making the overall structure of the battery pack more stable.

[0063] Furthermore, by adopting the design of fixing the bending plate 110, during the installation process, individual battery cells 200 can be placed into the box 100 one by one. This means that there is no need to use complex stacking and lifting equipment during the production process, which not only saves manufacturing costs but also significantly improves production efficiency.

[0064] In this embodiment, the battery pack assembly also includes a plastic end plate 103, which is arranged at both ends of the fixed bending plate 110 to prevent the large surface of the battery cell 200 from directly contacting and rubbing with the enclosure 102 at both ends of the bottom plate 101, thereby damaging the blue film of the battery cell 200 and causing a short circuit.

[0065] Please continue to refer to Figure 2 The fixing portion includes a partition portion 111 and a second bent portion 112, the second bent portion 112 is connected to the bottom end of the partition portion 111, and the second bent portion 112 extends toward the battery cell 200. The first bent portion 113, the partition portion 111, and the second bent portion 112 form a second concave cavity, and when the battery cell 200 is accommodated in the accommodating longitudinal cavity 130, part of the battery cell 200 is stuck in the second concave cavity.

[0066] In this embodiment, the first bending portion 113 and the partition portion 111 are perpendicular to each other, the partition portion 111 and the second bending portion 112 are perpendicular to each other, and the first bending portion 113 and the second bending portion 112 in the second cavity are parallel to each other.

[0067] Through the above scheme, the design of the second bending portion 112 and the second cavity enables the fixing portion to be more firmly fixed on the bottom plate 101, and the battery cell 200 is also more firmly fixed in the accommodating longitudinal cavity 130. Part of the structure of the battery cell 200 is stuck in the second cavity, which can effectively prevent the displacement and vibration of the battery cell 200 during use, thereby significantly improving the overall stability and reliability of the battery pack. In addition, the design achieves the fixation and separation of the battery cell 200 through the ingenious structure of the bending plate without the need for additional complex structural parts or adhesives. This not only simplifies the structure of the battery pack, but also reduces the manufacturing cost and process complexity. The fixing method of the battery cell 200 being stuck in the second cavity increases the protection of the battery cell 200 to a certain extent and reduces the risk of damage caused by collision or impact. At the same time, this fixing method makes the disassembly and replacement of the battery cell 200 more convenient, significantly improving the maintainability of the battery pack.

[0068] In some embodiments, the fixed bending plate 110 further includes a third bending portion 114 , which is connected to the first bending portion 113 and forms an angle with the first bending portion 113 .

[0069] In this embodiment, the third bending portion 114 and the first bending portion 113 are perpendicular to each other. When the pressing block structure 120 is inserted into the first gap, both ends of the pressing shoulder portion 122 abut against the third bending portion 114 to improve the fixing effect of the pressing block structure 120 .

[0070] Through the above scheme, during the assembly process of the battery cell 200, the third bending portion 114 can be used as a fulcrum to facilitate the breaking apart of the fixed bending plate 110, thereby facilitating the assembly of the battery cell 200 into the accommodating longitudinal cavity 130. The design of the third bending portion 114 provides convenience for the assembly of the battery cell 200. During the assembly process, the operator can use the third bending portion 114 as a fulcrum to easily break apart the fixed bending plate 110, thereby more conveniently placing the battery cell 200 into the accommodating longitudinal cavity 130. This greatly simplifies the assembly process and improves production efficiency. When the battery cell 200 needs to be replaced or maintained, the third bending portion 114 can also be used as a fulcrum to facilitate the operator to quickly disassemble and reassemble the battery cell 200. This design not only improves the maintainability of the battery pack, but also reduces maintenance costs.

[0071] Figure 4 A schematic diagram of a pressing block structure 120 provided in this embodiment. Figure 5 This is a schematic diagram of the battery cell 200 provided in this embodiment being installed into the accommodating longitudinal cavity 130 . Figure 6 This is a schematic diagram of installing the pressing block structure 120 after the battery cell 200 provided in this embodiment is installed into the accommodating longitudinal cavity 130. Please refer to Figures 4 to 6 In this embodiment, the battery pack assembly also includes a pressing block structure 120, which includes an insertion portion 121 and a shoulder portion 122. The shoulder portion 122 is perpendicular to the insertion portion 121. There is a first gap between two adjacent longitudinal accommodating cavities 130 or between the enclosure 102 on both sides of the bottom plate 101 and the adjacent fixed bending plate 110. The insertion portion 121 is inserted into the first gap, and the shoulder portion 122 extends toward the direction of the battery cell 200 and its two ends are respectively against the third bending portion 114.

[0072] It is understandable that the structure of the pressing block structure 120 can be divided into two types, one is a pressing plate structure located between the box body 100 and the fixed bending plate 110, and the pressing shoulder 122 in this pressing block structure 120 has only one side. The other is a pressing plate structure located between two fixed bending plates 110, and the pressing shoulder 122 of this pressing block structure 120 is located on both sides of the insertion part 121, and can apply pressure to the battery cells 200 on both sides.

[0073] Through the above scheme, the insertion portion 121 of the block structure 120 is inserted between two adjacent fixed bending plates 110, forming an integrated structure with the fixed bending plates 110, thereby enhancing the structural strength of the entire battery pack. At the same time, the cooperation between the shoulder portion 122 and the third bending portion 114 further improves the stability of the overall structure and reduces the risk of structural deformation caused by external forces. The design of the block structure 120 makes the battery cells 200 more compactly arranged in the accommodating longitudinal cavity 130, reducing the gaps between the battery cells 200. This compact layout not only improves the volume energy density of the battery pack, but also further optimizes the space utilization, allowing the battery pack to accommodate more battery cells 200, thereby improving the overall performance. The design of the block structure 120 makes the assembly and disassembly of the battery cells 200 more convenient. During assembly, the insertion portion 121 can be quickly inserted between the fixed bending plates 110, and the shoulder portion 122 can be directly pressed on the upper surface of the battery cell 200 and against the third bending portion 114, without the need for complex fixing tools or adhesives. During disassembly, the battery cell 200 can be easily removed by simply lifting the pressing block structure 120, which greatly simplifies the operation process, improves production efficiency, and reduces manufacturing costs. The matching design of the pressing block structure 120 and the third bending portion 114 is not only suitable for battery cells 200 of different sizes, but can also be adjusted and optimized according to specific needs. This design enhances the versatility and adaptability of the battery pack assembly, enabling it to better meet diverse needs.

[0074] In this embodiment, the end of the insertion portion 121 is set as a chamfered structure, which can effectively reduce the friction and resistance between the insertion portion 121 and the fixed bending plate 110 during the assembly process, making it easier for the insertion portion 121 to be inserted between two adjacent fixed bending plates 110. This design significantly improves the assembly efficiency and reduces the risk of jamming or damage that may occur during the assembly process. The chamfered structure provides a guiding slope for the insertion portion 121, which can ensure that the insertion portion 121 accurately enters the predetermined position during assembly, avoiding structural deformation or damage caused by improper assembly. This not only improves the accuracy of assembly, but also enhances the overall reliability of the battery pack.

[0075] In this embodiment, the length of the insertion portion 121 is less than or equal to the height of the battery cell 200. The length of the insertion portion 121 determines the depth of insertion. The deeper the insertion, the more stable the assembly. However, a shorter length of the insertion portion 121 can reduce the overall weight and reduce the overall weight of the battery pack. Therefore, the length of the insertion portion 121 is designed to be less than or equal to the height of the battery cell 200, so that the pressing block structure 120 will not exceed the height range of the battery cell 200 after assembly. This design further optimizes the internal space layout of the battery pack, avoids unnecessary space occupation, and thus improves the volume energy density of the battery pack.

[0076] Figure 7This is a schematic diagram of the battery pack pressing structure 120 provided in this embodiment after installation. Figure 8 for Figure 7 Schematic diagram of the structure along the section line CC1. Fig. 9 for Figure 8 Enlarged view of area B in the middle. Please refer to Figures 7 to 9 In this embodiment, the extension distance of the first bent portion 113 toward the battery cell 200 is a first distance L1, and there is a first gap between two adjacent longitudinal accommodating cavities 130 or between the enclosures 102 on both sides of the bottom plate 101 and the adjacent fixed bent plates 110. The size of the first gap is a second distance L2, and the second distance L2 is greater than the first distance L1.

[0077] According to the above scheme, during the assembly process of the battery cell 200, the first bending portion 113 needs to be opened clockwise or counterclockwise, and the connection between the first bending portion 113 and the fixed portion is used as the axis. In order for the first bending portion 113 to be opened smoothly, sufficient avoidance space is required. Therefore, the second distance L2 (the distance between two adjacent fixed bending plates 110) is set to be greater than the first distance L1 (the extension distance of the first bending portion 113 toward the battery cell 200) during design.

[0078] Please refer to Figure 2 and Figure 8 In this embodiment, a buffer structure 300 is further provided between the partition portion 111 and the battery cell 200 , and the buffer structure 300 is fixed on the partition portion 111 .

[0079] The buffer structure 300 can effectively absorb and disperse the vibration and impact force to which the battery cell 200 is subjected during use, reduce the displacement or damage of the battery cell 200 caused by external forces, and thus improve the stability and reliability of the battery cell 200. The buffer structure 300 can reduce the stress generated by the expansion or contraction of the battery cell 200 during the charge and discharge cycle, reduce the fatigue and damage of the internal structure of the battery cell 200, and thus extend the service life of the battery cell 200.

[0080] In this embodiment, the buffer structure 300 may be made of a material having excellent buffering, shock resistance, heat insulation, moisture resistance and other properties, for example, buffer foam, and is fixed to the inner surface of the partition part 111 by gluing.

[0081] The buffer structure 300 can not only protect the battery cell 200 , but also has the important function of absorbing the dimensional tolerance of the first gap when the insertion portion 121 is inserted into the first gap, thereby ensuring that the pressing block structure 120 or the battery cell 200 can be smoothly inserted into the box.

[0082] Figure 3A schematic diagram of a structure in which a protective sheet 210 is provided on a single battery cell 200 provided in this embodiment. In this embodiment, the battery pack assembly further includes a protective sheet 210, and the two sides of the battery cell 200 facing the fixed bending plate 110 are respectively the first side surface and the second side surface of the battery cell 200, and the protective sheet 210 is fixed to the first side surface and the second side surface of the battery cell 200.

[0083] Through the above scheme, the protective sheet 210 is fixed on the first side and the second side of the battery cell 200, which can effectively prevent the blue film of the battery cell 200 from being damaged and avoid internal short circuit caused by damage to the blue film. This design can also prevent the battery cell 200 from being mechanically damaged during assembly, use or maintenance, such as scratches, collisions or extrusion. These protective measures help to extend the service life of the battery cell 200 and improve its reliability. In addition, the protective sheet 210 can prevent direct contact between the battery cell 200 and the fixed bending plate 110 or other metal parts, thereby reducing the risk of short circuit. The protective sheet 210 can also buffer the stress of the battery cell 200 when it is impacted to a certain extent, reduce the damage to the internal structure caused by external force, and further improve the safety of the battery pack. Since the protective sheet 210 corresponds to a single battery cell 200 one by one, that is, the first side and the second side of each battery cell 200 are correspondingly provided with a protective sheet 210, this makes it possible to perform directional maintenance of a single battery cell 200, thereby improving the maintainability of the battery pack.

[0084] In this embodiment, the protective sheet 210 includes a protective main plate 211 and a first isolation plate. The protective main plate 211 is attached to the first side or the second side of the battery cell 200. The first isolation plate is connected to the top of the protective main plate 211. The first isolation plate includes a first protective sheet 212 that is attached to a portion of the upper surface of the battery cell 200.

[0085] Through the above solution, the protective main body plate 211 is attached to the side of the battery cell 200 to provide side protection. The first isolation plate is attached to a portion of the upper surface of the battery cell 200 to further protect the top of the battery cell 200. This design can effectively prevent the battery cell 200 from mechanical damage, such as scratches, collisions or extrusion, during assembly, use or maintenance, and avoid internal short circuits caused by damage to the blue film.

[0086] In some embodiments, the first isolation plate also includes a second protection sheet 213 and a third protection sheet (not shown), the second protection sheet 213 is connected to the first protection sheet 212, the third protection sheet is connected to the second protection sheet 213, and the first protection sheet 212, the second protection sheet 213 and the third protection sheet form a third concave cavity (not shown); the bottom end of the protective main body plate 211 is also connected to a second isolation plate 214, and the second isolation plate 214 extends toward the direction of the battery cell 200.

[0087] When the battery cell 200 is assembled in the accommodating longitudinal cavity 130, the first bending portion 113 extends toward the battery cell 200, and the battery cell 200 is stuck in the accommodating longitudinal cavity 130. Since the first protective sheet 212, the second protective sheet 213 and the third protective sheet jointly form the third concave cavity, the first bending portion 113 is located in the third concave cavity, thereby playing a better protective and isolating role. This not only increases the creepage distance, but also avoids the short circuit between the battery cell 200 assembly and the fixed bending plate 110. For example, after the battery cell 200 is loaded into the accommodating longitudinal cavity 130, a bar is also arranged above the battery cell. Therefore, the bar area 220, the second protective sheet 213 or the third concave cavity can better avoid the short circuit between the bar area 220 and the fixed bending plate 110. In addition, the second isolation plate 214 extends toward the battery cell 200, which can provide protection under the battery cell 200 to prevent the battery cell 200 from being mechanically damaged (such as scratches, collisions or extrusion).

[0088] Based on the above embodiments, the present application also provides a method for manufacturing a battery pack, including:

[0089] Step 1, providing a box body 100, wherein the box body 100 comprises a bottom plate 101 and a surrounding plate 102 surrounding the bottom plate 101, wherein the bottom plate 101 and the surrounding plate 102 form a first concave cavity.

[0090] Step 2, providing a fixed bending plate 110, the fixed bending plate 110 includes a fixed portion and a first bending portion 113, the first bending portion 113 is connected to the top end of the fixed portion, and the first bending portion 113 forms an angle with the fixed portion.

[0091] Step 3, fix the fixing part in the first concave cavity and set it parallel to the length direction of the bottom plate 101 to form a plurality of accommodating longitudinal cavities 130, and there are two fixed bending plates 110 between two adjacent accommodating longitudinal cavities 130.

[0092] Step 4: bend the first bent portion 113 in a clockwise or counterclockwise direction, and place a plurality of battery cells 200 into the accommodating longitudinal cavity 130 in sequence.

[0093] Since the structure and beneficial effects of the above-mentioned battery pack assembly have been described in detail in the previous embodiments, the present application will not repeat them here.

[0094] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack assembly, characterized in that: include: A box body, the box body having a bottom plate and a surrounding plate surrounding the bottom plate, the bottom plate and the surrounding plate forming a first concave cavity; A fixed bending plate, the fixed bending plate is arranged in the first concave cavity and is arranged parallel to the length direction of the bottom plate to form a plurality of accommodating longitudinal cavities, the fixed bending plate comprises a fixed portion and a first bending portion, the first bending portion is connected to the top end of the fixed portion, the first bending portion and the fixed portion form an angle, and two adjacent accommodating longitudinal cavities are provided with two back-to-back fixed bending plates; A plurality of battery cells are arranged in sequence and accommodated in the longitudinal accommodation cavity, and the first bent portion extends toward the battery cells to clamp the battery cells in the longitudinal accommodation cavity.

2. The battery pack assembly according to claim 1, characterized in that: The fixing portion includes a partition portion and a second bent portion, wherein the second bent portion is connected to the bottom end of the partition portion and extends toward the direction of the battery cell; the first bent portion, the partition portion and the second bent portion constitute a second concave cavity, and when the battery cell is accommodated in the accommodating longitudinal cavity, part of the battery cell is stuck in the second concave cavity.

3. The battery pack assembly according to claim 2, characterized in that: The fixed bending plate further includes a third bending portion, which is connected to the first bending portion and forms an angle with the first bending portion.

4. The battery pack assembly according to claim 3, characterized in that: A buffer structure is further provided between the partition part and the battery core, and the buffer structure is fixed on the partition part.

5. The battery pack assembly according to any one of claim 4, characterized in that: It also includes a pressing block structure, which includes an insertion portion and a shoulder portion, the shoulder portion is perpendicular to the insertion portion, and a first gap is provided between two adjacent longitudinal accommodating cavities or between the enclosures on both sides of the bottom plate and the adjacent fixed bending plates, the insertion portion is inserted into the first gap, the shoulder portion extends toward the direction of the battery cell and both ends are respectively abutted against the third bending portion.

6. The battery pack assembly according to claim 5, characterized in that: The end of the insertion portion is configured as a chamfered structure; the length of the insertion portion is less than or equal to the height of the battery core.

7. The battery pack assembly according to claim 5, characterized in that: An extension distance of the first bent portion toward the battery core is a first distance, a size of the first gap is a second distance, and the second distance is greater than the first distance.

8. The battery pack assembly according to any one of claims 1 to 5, characterized in that: It also includes a protective sheet, and the two sides of the battery core facing the fixed bending plate are respectively the first side surface and the second side surface of the battery core, and the protective sheet is fixed to the first side surface and the second side surface of the battery core.

9. The battery pack assembly according to claim 8, characterized in that: The protective sheet includes a protective main plate and a first isolation plate, the protective main plate is attached to the first side or the second side of the battery cell, the first isolation plate is connected to the top of the protective main plate, and the first isolation plate includes a first protective sheet that is attached to a portion of the upper surface of the battery cell.

10. The battery pack assembly according to claim 9, characterized in that: The first isolation plate further includes a second protection sheet and a third protection sheet, the second protection sheet is connected to the first protection sheet, the third protection sheet is connected to the second protection sheet, and the first protection sheet, the second protection sheet and the third protection sheet form a third concave cavity; The bottom end of the protective main body plate is also connected to a second isolation plate, and the second isolation plate extends toward the battery core.

11. A method for manufacturing a battery pack, characterized in that: Includes steps: Providing a box body, the box body having a bottom plate and a surrounding plate surrounding the bottom plate, the bottom plate and the surrounding plate forming a first concave cavity; Providing a fixed bending plate, the fixed bending plate comprising a fixed portion and a first bending portion, the first bending portion being connected to a top end of the fixed portion, and the first bending portion and the fixed portion forming an angle; The fixing part is fixed in the first concave cavity and arranged parallel to the length direction of the bottom plate to form a plurality of accommodating longitudinal cavities, and two of the fixing bent plates are arranged between two adjacent accommodating longitudinal cavities; The first bending portion is opened in a clockwise or counterclockwise direction, and a plurality of battery cells are placed into the accommodating longitudinal cavity in sequence.

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