Cylindrical battery module

Abstract

The utility model discloses a cylindrical battery module relates to the technical field of battery module, including a plurality of cylindrical batteries, along its axial direction direction connects in proper order in series, a plurality of conductive connecting piece are set between two cylindrical batteries of adjacent, form a battery stack, a cylindrical shell, and the battery stack is contained in the cylindrical shell, two end covers are sealed connection through insulating sealing washer and the both ends of cylindrical shell respectively, axial pre -compression spring sets up in one end of battery stack, is used for to whole battery stack applies axial pressure force. The utility model discloses a cylindrical battery module adopts cylindrical shell and integrates a plurality of cylindrical batteries in the inside, can be as a kind of standardization high-voltage battery stick product, and it is convenient to carry and use and downstream product integrated design. The internal resistance of cylindrical battery module is low, and the series connection mode of direct contact of conductive connecting piece, significantly reduces the connection internal resistance and heating, supports greater current discharge.

Description

Technical Field

[0001] This utility model relates to the technical field of fiber optic drones, specifically to fiber optic drones powered by hydrogen fuel cells. Background Technology

[0002] Cylindrical lithium-ion batteries (such as 18650, 21700, 32650, etc.) are widely used due to their high energy density, mature technology and low cost. Traditionally, when combining multiple cylindrical batteries into a high-voltage module, the usual method is to first connect several batteries in parallel to form a group, and then connect multiple parallel groups in series (i.e., parallel first and then series).

[0003] For example, Chinese utility model patent CN215816263U discloses a parallel and series structure for a cylindrical battery module that can be quickly assembled and disassembled, consisting of a plastic frame, metal conductive sheets, and a battery. The battery pack consists of a connecting frame and a battery. A single battery assembly is formed by welding a metal conductive sheet, a plastic frame, and a battery together. Several single battery assemblies are mounted on the battery connecting frame to form a parallel battery module. Several parallel battery modules are connected in series to form a battery module with multiple series and parallel structures. This method requires a large amount of nickel strip for spot welding, which is complex and results in high internal resistance at the connection points. It also generates significant heat during high-current discharge, affecting performance and safety. Furthermore, traditional battery packs are mostly rectangular, resulting in low space utilization and making them difficult to adapt to equipment requiring circular or long rod-shaped installation spaces.

[0004] Therefore, there is an urgent need for a cylindrical battery integration solution with excellent high-current discharge performance, extremely high space utilization, and easy mobility. Summary of the Invention

[0005] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a cylindrical battery module. This cylindrical battery module, through innovative integrated mechanical and electrical design, achieves extremely high space utilization, excellent high-current discharge performance, and good thermal management.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A cylindrical battery module, comprising: Multiple cylindrical batteries are connected in series along their axial direction, and the multiple cylindrical batteries are multiple cylindrical power lithium-ion batteries of the same model. Multiple conductive connecting pieces are disposed between two adjacent cylindrical batteries for series connection between the multiple cylindrical batteries to form a battery stack; A cylindrical housing, within which the battery stack is housed; Two end caps, including a positive end cap and a negative end cap, are respectively sealed to both ends of the cylindrical outer shell by insulating sealing rings and electrically insulated from the cylindrical outer shell, and at least one of the end caps is provided with an output electrode; An axial preload spring is disposed at one end of the battery stack and is used to apply an axial clamping force to the entire battery stack.

[0007] Preferably, the conductive connecting piece is an elastic metal sheet with a central through hole, and its cross-section is one of butterfly, wave, or spiral shape, which can generate radial elastic deformation when subjected to axial pressure.

[0008] Preferably, the axial preload spring is a helical compression spring, a butterfly spring, or an elastic rubber column.

[0009] Preferably, it also includes a BMS for managing the entire battery module. The BMS is disposed inside a cylindrical housing, with its power input terminal connected to the total positive and total negative terminals of the battery stack, and its power output terminal connected to the output electrode on the end cover.

[0010] Preferably, it also includes a temperature sensor disposed inside the cylindrical housing and connected to the BMS.

[0011] Preferably, the cylindrical outer shell is made of aluminum alloy, the inner diameter of the cylindrical outer shell is larger than the outer diameter of the battery stack, and a thermally conductive insulating material is filled between the cylindrical outer shell and the battery stack.

[0012] Preferably, the circuit board of the BMS is circular, and its shape is adapted to the inner diameter of the cylindrical shell.

[0013] Compared with related technologies, the cylindrical battery module provided by this utility model has the following advantages: 1. The cylindrical battery module of this utility model integrates multiple cylindrical batteries inside a cylindrical shell, and can be used as a standardized high-voltage "battery stick" product, which is convenient to carry and use and to integrate with downstream products.

[0014] 2. The cylindrical battery module of this utility model has low internal resistance. The series connection method with direct contact of conductive connecting pieces can realize the series connection of multiple cylindrical batteries without welding, which significantly reduces the connection internal resistance and heat generation, supports larger current discharge, and simplifies the entire battery assembly process, thereby reducing the cost of battery assembly.

[0015] 3. The axial preload spring and conductive connecting piece enable the entire battery module to effectively resist vibration and impact, providing continuous axial clamping force for the entire battery stack, and ensuring that all electrical connection points maintain stable and reliable low-resistance contact under vibration and impact environments.

[0016] 4. Thermally conductive insulating material is filled between the cylindrical outer shell and the battery stack, which efficiently conducts the heat generated by the battery stack during operation to the cylindrical outer shell and dissipates it to the outside, reducing the risk of battery thermal runaway and improving battery safety. Attached Figure Description

[0017] Figure 1 A 3D view of a cylindrical battery module; Figure 2 This is a partial exploded view of a cylindrical battery module. Figure 3 A schematic diagram of the structure in which an insulating film is wrapped around the bottom of the battery stack.

[0018] Reference numerals: 1. Cylindrical battery; 2. Conductive connecting piece; 3. Battery stack; 4. Cylindrical outer shell; 5. End cap; 6. Axial preload spring; 7. BMS; 8. Insulating sealing ring; 9. Insulating film. Detailed Implementation

[0019] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that these preferred embodiments can be readily implemented by those skilled in the art. However, in describing the operating principles of the preferred embodiments of the present invention, detailed descriptions of known functions and configurations incorporated herein will be omitted where such descriptions may obscure the subject matter of the invention.

[0020] Furthermore, throughout the accompanying drawings, the same reference numerals will be used to refer to parts that perform similar functions or operations. Throughout the specification, where a part is referred to as being connected to another part, a part can be directly connected to the other part, and a part can also be indirectly connected to the other part via another part. Moreover, including an element does not mean excluding other elements, but rather means that such elements may be included unless otherwise specified.

[0021] Furthermore, descriptions that embody elements by limiting or adding them can be applied to all inventions unless otherwise specified, and do not limit any particular invention.

[0022] Furthermore, in the specification of this utility model and the claims of this application, unless otherwise stated, the singular form is intended to include the plural form.

[0023] Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0024] Reference Figures 1 to 3 The cylindrical battery module of this utility model includes: multiple cylindrical batteries 1, multiple conductive connecting pieces 2, a cylindrical shell 4, two end caps 5, and an axial preload spring 6.

[0025] The multiple cylindrical batteries 1 are all cylindrical power lithium batteries of the same model, including one of 10440, 14500, 16340, 18650, 21700, 26650, and 32650. The multiple cylindrical batteries 1 are arranged sequentially along their axial direction, and a conductive connecting piece 2 is provided between two adjacent cylindrical batteries 1 for series connection between the multiple cylindrical batteries 1. The conductive connecting piece 2 between the cylindrical batteries 1 realizes the physical contact and electrical series connection of "positive electrode - conductive connecting piece - negative electrode", forming a battery stack 3.

[0026] The cylindrical outer casing 4 is a hollow cylinder with openings at both ends, used to house and protect the battery stack. The cylindrical outer casing 4 is preferably made of aluminum alloy, which combines structural strength, lightweight, and excellent thermal conductivity.

[0027] The two end caps 5 include a positive end cap 5 and a negative end cap 5, which are respectively sealed to both ends of the cylindrical outer shell 4 by insulating sealing rings 8 and achieve electrical insulation isolation. At least one end cap 5 is provided with an output electrode. A sealed and insulating cavity for accommodating the battery stack 3 is formed between the cylindrical outer shell 4 and the two end caps 5.

[0028] An axial preload spring 6 is disposed at one end of the battery stack 3. The axial preload spring 6 has elastic force. After the cylindrical battery module 1 is packaged, the axial preload spring 6 is compressed, providing continuous axial clamping force to the entire battery stack 3. This ensures that all electrical connection points maintain stable and reliable low-resistance contact under vibration and shock environments, which is crucial for achieving good electrical performance. Since this structure is not the inventive point of this application and is a conventional technical means known to those skilled in the art, it will not be described in detail here.

[0029] In this embodiment, the conductive connecting piece 2 is an elastic metal sheet with a central through hole. Its cross-section is one of butterfly, wave, or spiral shape, preferably a disc or wave elastic metal sheet. It can generate radial elastic deformation when axially compressed, generating radial tension to ensure large-area, low-resistance contact with the battery electrode surface.

[0030] In this embodiment, the axial preload spring 6 is one of a helical compression spring, a butterfly spring, or an elastic rubber column, preferably a helical compression spring. The negative terminal of the battery stack 3 faces downward and contacts the helical compression spring inside the end cover 5.

[0031] In this embodiment, a BMS7 for managing the entire battery module is also included. The BMS7's circuit board is a circular PCB designed to fit the inner diameter of the cylindrical housing 4. The BMS7 is disposed inside the cylindrical housing 4, close to the inside of one of the end caps 5 or the end of the battery stack 3. Its power input terminal is connected to the total positive and negative terminals of the battery stack 3 via sampling lines, and its power output terminal is connected to the output electrodes on the end cap 5. The output electrodes include a positive output terminal and a negative output terminal. The BMS7 draws the controlled power from the positive and negative output terminals. The BMS7 has overcharge, over-discharge, overcurrent, short circuit, and temperature protection functions, and can be optionally equipped with a passive equalization function.

[0032] In this embodiment, the inner diameter of the cylindrical outer shell 4 is larger than the outer diameter of the battery stack 3, and there is a gap between the cylindrical outer shell 4 and the battery stack 3. The gap is filled with a thermally conductive and insulating material, such as thermally conductive silicone. This efficiently conducts the heat generated by the battery stack 3 during operation to the cylindrical outer shell 4 and dissipates it to the outside. Since this structure is not the inventive point of this application and is a conventional technical means known to those skilled in the art, it will not be described in detail here.

[0033] In this embodiment, a temperature sensor (not shown in the figure) is installed inside the cylindrical outer shell 4. The temperature sensor is connected to the BMS7 to realize temperature monitoring of the battery stack 3.

[0034] In this embodiment, an insulating film 9 is wrapped around the outside of the battery stack 3.

[0035] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cylindrical battery module, characterized in that, include: Multiple cylindrical batteries (1) are connected in series along their axial direction; Multiple conductive connecting pieces (2) are disposed between two adjacent cylindrical batteries (1) for series connection between the multiple cylindrical batteries (1) to form a battery stack (3); A cylindrical housing (4) is provided, and the battery stack (3) is housed within the cylindrical housing (4); Two end caps (5) are respectively sealed to both ends of the cylindrical shell (4) by insulating sealing rings (8) and electrically insulated from the cylindrical shell (4), and at least one end cap (5) is provided with an output electrode; An axial preload spring (6) is disposed at one end of the battery stack (3) for applying axial clamping force to the entire battery stack (3).

2. The cylindrical battery module according to claim 1, characterized in that: The conductive connecting piece (2) is an elastic metal piece with a central through hole. Its cross-section is one of butterfly, wave or spiral shape, and it can generate radial elastic deformation when subjected to axial pressure.

3. The cylindrical battery module according to claim 1, characterized in that: The axial preload spring (6) is a helical compression spring, a butterfly spring, or an elastic rubber column.

4. The cylindrical battery module according to claim 1, characterized in that: It also includes a BMS (7) for managing the entire battery module. The BMS (7) is located inside the cylindrical housing (4). Its power input terminal is connected to the total positive and total negative terminals of the battery stack (3), and its power output terminal is connected to the output electrode on the end cover (5).

5. The cylindrical battery module according to claim 4, characterized in that: It also includes a temperature sensor, which is disposed inside the cylindrical housing (4) and connected to the BMS (7).

6. The cylindrical battery module according to claim 1, characterized in that: The cylindrical outer shell (4) is made of aluminum alloy, and the inner diameter of the cylindrical outer shell (4) is larger than the outer diameter of the battery stack (3). The cylindrical outer shell (4) and the battery stack (3) are filled with thermally conductive insulating material.

7. The cylindrical battery module according to claim 4, characterized in that: The circuit board of the BMS (7) is circular, and its shape is adapted to the inner diameter of the cylindrical shell (4).

Images