Middle-fixed cylindrical battery module and battery pack

Abstract

The utility model discloses a middle-fixed cylindrical battery module and a battery pack. The middle-fixed cylindrical battery module comprises two end brackets and a plurality of cylindrical battery cells, the two end supports are arranged in a spaced mode, fixing seats are arranged on the end supports, fixing holes are formed in the fixing seats, the fixing seats are located in the middle positions of the end supports in the height direction, and all the cylindrical battery cells are arranged between the two end supports. The fixing seat is arranged in the middle of the end support in the height direction, so that the fixing point of the battery module and the shell is located in the middle of the battery module in the height direction and is in the same plane with the gravity center of the battery module, when the battery pack is strongly vibrated, the shearing force borne by the fixing point is small, and the durability of the fixing point is good.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a cylindrical battery module and a battery pack with a fixed center. Background Art

[0002] As the market's requirements for battery energy density and power density become increasingly higher, a large battery module usually requires hundreds of single cells connected in series and parallel. This puts forward requirements for the efficiency and stability of the process assembly. The design of the module structure requires not only simple assembly, but also a strong structure. In the application process, the battery pack is subjected to strong vibration conditions, and the reliability of the connection of each battery module needs to be guaranteed.

[0003] However, the existing cylindrical battery module is provided with a connecting ear at the bottom of the end plate, and a fastener is used to pass through the connecting ear to connect to the battery pack shell. The battery module has a certain height. If the connecting ear is set at the bottom of the battery module, the fixing point at the bottom will be subjected to a large shear force, and the connecting piece and the connecting ear are easily deformed by the force, resulting in poor stability of the connection structure between the battery module and the shell, which may not only affect product performance, but also increase the investment in subsequent maintenance.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The utility model provides a cylindrical battery module and a battery pack with a fixed center.

[0006] The utility model adopts the following technical solutions:

[0007] The first object of the present application is to provide a cylindrical battery module with a fixed center, comprising:

[0008] Two end brackets, the two end brackets are arranged at intervals, a fixing seat is arranged on the end bracket, the fixing seat has a fixing hole, and the fixing seat is located in the middle position of the end bracket along the height direction;

[0009] A plurality of cylindrical battery cells are provided, each of the cylindrical battery cells is arranged between the two end brackets.

[0010] Optionally, a plurality of fixing seats are arranged on the end bracket, and the fixing seats are arranged in sequence and spaced apart along the length direction of the end bracket.

[0011] Optionally, the fixing seat and the end bracket are fixed by fasteners;

[0012] Alternatively, the fixing seat and the end bracket are an integral part.

[0013] Optionally, the fixing seat and the end bracket are an integral part formed by injection molding.

[0014] Optionally, the fixing seat is a metal piece.

[0015] Optionally, the fixing seat includes a connecting piece portion and an outer extending piece portion vertically connected to the connecting piece portion, and the connecting piece portion is connected to the end bracket;

[0016] The outer extending piece protrudes from the end bracket.

[0017] Optionally, the end bracket has a bracket main board and an annular rib located on the bracket main board;

[0018] The annular rib is circumferentially arranged around the connecting piece portion, and the annular rib is connected to the connecting piece portion.

[0019] Optionally, the thickness of the connecting sheet portion is greater than the thickness of the outer extending sheet portion.

[0020] Optionally, an insulating plate is included, the insulating plate is attached to the end bracket, the insulating plate has an avoidance groove, and the fixing seat passes through the avoidance groove.

[0021] The second object of the present application is to provide a battery pack, comprising:

[0022] A housing having a cavity and a fixed fitting portion;

[0023] Several of the above-mentioned intermediate fixed cylindrical battery modules are located in the cavity, and the fixing base of the cylindrical battery module is fixed to the fixing matching part by fasteners.

[0024] By adopting the above technical solution, the utility model has the following beneficial effects:

[0025] The present application arranges the fixing seat at the middle position of the end bracket in the height direction, so that the fixing point of the battery module and the shell is located in the middle position of the height direction of the battery module and is in the same plane as the center of gravity of the battery module. When the battery pack is subjected to strong vibration, the shear force on the fixing point is small and the durability of the fixing point is good.

[0026] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are part of this application and are used to provide a further understanding of the utility model. The schematic embodiments of the utility model and their descriptions are used to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 A schematic diagram of the top view of the structure of a cylindrical battery module with a middle fixed therein provided in an embodiment of the present application is shown;

[0029] Figure 2 A schematic diagram of the exploded structure of a cylindrical battery module with a middle fixed therein provided in an embodiment of the present application is shown;

[0030] Figure 3 A schematic diagram of the structure of a cylindrical battery module with a middle fixed therein provided in an embodiment of the present application after removing the insulating plate is shown;

[0031] Figure 4 for Figure 3 A partial enlarged view of

[0032] Figure 5 A schematic structural diagram of a fixing base of a cylindrical battery module fixed in the middle provided in an embodiment of the present application is shown.

[0033] In the figure: an end bracket 1, a bracket main board 11, an annular rib 12, a cylindrical battery cell 2, a fixing seat 3, a fixing hole 31, a connecting piece 32, an outer extending piece 33, an insulating plate 4, and an avoidance groove 41.

[0034] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0036] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component 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 invention.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] See also Figures 1 to 5 As shown, an embodiment of the present application provides a cylindrical battery module with a middle fixation, including two end brackets 1 and a plurality of cylindrical battery cells 2. The two end brackets 1 are arranged at intervals, and a fixing seat 3 is arranged on the end bracket 1. The fixing seat 3 has a fixing hole 31, and the fixing seat 3 is located in the middle position of the end bracket 1 along the height direction. Each of the cylindrical battery cells 2 is arranged between the two end brackets 1. The present application arranges the fixing seat in the middle position of the end bracket along the height direction, so that the fixing point of the battery module and the shell is located in the middle position of the height direction of the battery module, and is in the same plane as the center of gravity of the battery module. When the battery pack is subjected to strong vibration, the shear force on the fixing point is small, and the durability of the fixing point is good.

[0039] In a possible implementation, a plurality of fixing seats 3 are provided on the end bracket 1, and each of the fixing seats 3 is arranged in sequence and spaced apart along the length direction of the end bracket 1, and these fixing seats 3 can be fixed to the shell of the battery pack by fasteners. Multiple fixing seats fix the battery module at the same time, which significantly enhances the assembly structural strength of the battery module. When the battery pack is subjected to external impact, multiple fixing seats 3 can jointly bear the impact force, so that each fixing seat 3 is not subjected to too much force, thereby extending the service life of the fixing seat.

[0040] In a possible implementation, the fixing seat 3 and the end bracket 1 are fixed by fasteners. Exemplarily, the fixing seat 3 can be connected to the end bracket 1 by any one or more of rivet fixing, bolt fixing and adhesive fixing. The fixing seat 3 and the end bracket 1 can also be an integral piece. For example, the fixing seat 3 can also be an integrally molded piece formed by injection molding with the same material as the end bracket 1. The fixing seat 3 can also be a single piece, and the plastic can be injected into the mold by a high-pressure injection molding machine, and tightly attached to the surface of the fixing seat 3 coated with special ink. After a certain pressure and temperature treatment, the plastic and the fixing seat 3 are tightly combined into one, and finally an integrated plastic composite is formed.

[0041] Preferably, the fixing seat 3 and the end bracket 1 are an integral part formed by injection molding. Injection molding not only makes the structure more stable, but also eliminates the need for additional connection operations.

[0042] In a possible implementation, the fixing seat 3 is a metal part. The fixing seat 3 needs to be connected to the battery pack shell, and the fixing seat 3 needs to withstand a large force when the battery pack is vibrated. Therefore, the fixing seat 3 is more durable if it is made of metal. A high-pressure injection molding machine can be used to inject plastic into the mold and closely adhere to the surface of the metal fixing seat 3 coated with special ink. After a certain pressure and temperature treatment, the plastic and the metal fixing seat 3 are tightly combined into one, and finally an integrated plastic-metal composite is formed.

[0043] In one possible embodiment, Figure 5 As shown, the fixing seat 3 includes a connecting piece 32 and an outer extending piece 33 vertically connected to the connecting piece 32, the connecting piece 32 is connected to the end bracket 1, and the outer extending piece 33 protrudes from the end bracket 1. The sheet-shaped connecting piece 32 is provided, and the connecting piece 32 can be pre-embedded in the end bracket 1 through an injection molding process, and the connecting piece 32 is exposed to the end bracket 1 and can be perpendicular to the extending piece. The connecting piece is used to connect and fix with the shell of the battery pack through a fastener.

[0044] In one possible embodiment, Figure 4 As shown, the end bracket 1 has a bracket main board 11 and an annular rib 12 located on the bracket main board 11, the annular rib 12 is circumferentially arranged around the connecting piece 32, and the annular rib 12 is connected to the connecting piece 32. The annular rib 12 wraps around the connecting piece 32, and the thickness of the annular rib 12 is relatively thick. The connecting piece 32 is connected to the annular rib 12, and the connection stability is better.

[0045] In one possible embodiment, Figure 5 As shown, the thickness of the connecting piece 32 is greater than the thickness of the outer extension piece 33. It should be noted that the thickness of the connecting piece 32 mentioned in the application can be understood as parallel to the thickness direction of the extension piece. Increasing the thickness of the connecting piece 32 can increase the contact area between the connecting piece 32 and the plastic end, thereby enhancing the connection structure strength between the connecting piece 32 and the plastic end plate.

[0046] In one possible embodiment, Figure 2 As shown, the cylindrical battery module fixed in the middle also includes an insulating plate 4, which is attached to the end bracket 1, and has an escape groove 41, through which the fixing seat 3 passes. The escape hole escapes the extension piece, so that the extension piece protrudes from the insulating plate 4, which is convenient for connection with the shell of the battery pack.

[0047] Embodiment 2

[0048] Embodiment 2 of the present application also provides a battery pack, including a shell and several intermediate fixed cylindrical battery modules as described in the above embodiment 1. The shell has a cavity and a fixed fitting portion, the intermediate fixed cylindrical battery module is located in the cavity, and the fixing seat 3 of the cylindrical battery cell 2 module is fixed to the fixed fitting portion by a fastener. The position of the fixed fitting portion corresponds to the setting of the fixing seat 3. When the battery module is placed on the bottom wall of the shell, the position of the battery module is adjusted so that the fixing seat on the battery module extends to the fixed fitting portion, which can facilitate the connection between the fixing fitting portion and the fixing seat by fasteners. The fixed fitting portion can be a sheet metal part arranged on the inner wall of the shell, the sheet metal part can be fitted with the fixing seat, and the fastener can be a bolt, which passes through the sheet metal part and the fixing seat to connect and fix the two.

[0049] The battery pack provided in this embodiment uses the middle-fixed cylindrical battery module in Embodiment 1. When the middle-fixed cylindrical battery module is assembled into the battery pack, the fixing point is located in the middle position of the height direction of the battery module when the battery module is fixed to the shell. When the battery pack is subjected to strong vibration, the shear force on the fixing point is small, and the durability of the fixing point is strong, thereby ensuring that the performance of the battery pack is not affected in different usage environments and reducing the investment in subsequent maintenance.

[0050] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A cylindrical battery module with a fixed center, characterized in that: include: Two end brackets, the two end brackets are arranged at intervals, a fixing seat is arranged on the end bracket, the fixing seat has a fixing hole, and the fixing seat is located in the middle position of the end bracket along the height direction; A plurality of cylindrical battery cells are provided, each of the cylindrical battery cells is arranged between the two end brackets.

2. The cylindrical battery module with middle fixation according to claim 1, characterized in that: A plurality of fixing seats are arranged on the end bracket, and the fixing seats are arranged in sequence and at intervals along the length direction of the end bracket.

3. The cylindrical battery module with center fixation according to claim 1, characterized in that: The fixing seat and the end bracket are fixed by fasteners; Alternatively, the fixing seat and the end bracket are an integral part.

4. The cylindrical battery module with center fixation according to claim 1, characterized in that: The fixing seat and the end bracket are an integral part formed by injection molding.

5. The cylindrical battery module with center fixation according to claim 1, characterized in that: The fixing seat is a metal piece.

6. The cylindrical battery module with center fixation according to claim 1, characterized in that: The fixing seat comprises a connecting piece portion and an outer extending piece portion vertically connected to the connecting piece portion, and the connecting piece portion is connected to the end bracket; The outer extending piece protrudes from the end bracket.

7. The cylindrical battery module with center fixation according to claim 6, characterized in that: The end bracket comprises a bracket main plate and an annular rib located on the bracket main plate; The annular rib is circumferentially arranged around the connecting piece portion, and the annular rib is connected to the connecting piece portion.

8. The cylindrical battery module with center fixation according to claim 6, characterized in that: The thickness of the connecting piece portion is greater than the thickness of the outer extending piece portion.

9. The cylindrical battery module with center fixation according to any one of claims 1 to 8, characterized in that: It comprises an insulating plate, the insulating plate is attached to the end bracket, the insulating plate has an avoidance groove, and the fixing seat passes through the avoidance groove.

10. A battery pack, characterized in that: include: A housing having a cavity and a fixed fitting portion; A plurality of cylindrical battery modules with intermediate fixation as described in any one of claims 1 to 9, wherein the cylindrical battery module with intermediate fixation is located in the cavity, and the fixing seat of the cylindrical battery module is fixed to the fixing fitting portion by fasteners.

Images