Cylindrical battery cell shell and cylindrical battery cell

Abstract

This utility model provides a cylindrical battery cell housing, comprising: a housing body, wherein the housing body has multiple receiving slots for accommodating bare battery cells; the receiving slots are spaced apart, and the terminals of the bare battery cells in the receiving slots are electrically connected. By providing multiple receiving slots in the housing body for accommodating bare battery cells, an integrated design of multiple battery cells can be achieved, improving space utilization and making the overall structure more compact. The gaps between the receiving slots effectively prevent heat accumulation between the battery cells, improve heat dissipation, and ensure more reliable temperature control of the battery cells during operation. The electrical connection between the terminals of the bare battery cells in adjacent receiving slots simplifies the electrical connection structure, reduces the use of connecting components, lowers production costs, and improves connection reliability.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery manufacturing technology, and in particular to a cylindrical cell housing and a cylindrical cell. Background Technology

[0002] In the field of power and energy storage batteries, cylindrical batteries have seen significant development due to their advantages such as high single-cell energy density, high production efficiency, and good safety performance. Whether steel-cased or aluminum-cased, cylindrical batteries offer simple casing molding processes, high mechanical strength, and relatively low manufacturing costs, making them the most suitable structural form for mass production. Especially in rapidly developing application areas such as new energy vehicles and portable energy storage devices, cylindrical batteries have shown promising application prospects. However, the current application model for cylindrical batteries mainly involves producing individual cells and then connecting them in series or parallel to form modules or packs for different scenarios. This production method has several problems: First, the individual cell casings are molded independently. As the number of charge-discharge cycles increases, the core expansion can easily lead to insufficient casing strength, resulting in leakage risks. This not only affects the battery's lifespan but may also pose serious safety hazards. Second, producing individual cells separately and then assembling them into modules / packs not only increases assembly processes and labor costs but also results in low overall integration rates, affecting production efficiency and hindering the compact and lightweight design of battery packs. These issues have, to some extent, constrained the further development and large-scale application of cylindrical batteries. Utility Model Content

[0003] The purpose of this invention is to address the leakage problem caused by insufficient mechanical strength of the battery casing after long-term battery cell operation, while also improving the integration rate.

[0004] In a first aspect, this utility model provides a cylindrical battery cell housing, comprising: a housing body, wherein the housing body is provided with a plurality of receiving slots for accommodating bare battery cells; and the receiving slots are spaced apart.

[0005] Furthermore, the shell body is a one-piece molded structure.

[0006] Furthermore, the housing body includes a base plate, and the receiving groove is placed on a first surface of the base plate.

[0007] Furthermore, the base plate is also provided with a plurality of first explosion-proof valves, which are placed on the second surface of the base plate in the receiving groove, and the second surface is disposed opposite to the first surface.

[0008] Furthermore, the receiving groove forms an opening at the top of the base plate.

[0009] A second aspect of this utility model provides a cylindrical battery cell, which adopts a cylindrical battery cell housing as described in any of the preceding claims, and further includes a plurality of bare battery cells, wherein the bare battery cells are respectively disposed in the receiving groove.

[0010] Furthermore, the terminals of the bare cells in adjacent receiving slots are connected in series, in parallel, or in a series-parallel connection via connecting tabs.

[0011] Furthermore, the bare battery cell includes:

[0012] Core;

[0013] Liquid injection hole assembly provided on the winding core;

[0014] The pole is disposed on the core and passes through the injection hole assembly.

[0015] Furthermore, the injection hole assembly includes a sealing cap and an injection hole disposed on the sealing cap, the sealing cap being connected to and sealing one end of the winding core;

[0016] The injection hole penetrates the sealing cap, forming a channel connecting the inside of the core, for injecting electrolyte into the core;

[0017] The sealing cap forms a sealed connection with the inner wall edge of the receiving groove, and the bare battery cell is fixed in the receiving groove by the sealing cap.

[0018] Furthermore, the bare battery cell also includes a second explosion-proof valve, which is disposed on the sealing cover.

[0019] Compared to existing technologies, this invention offers at least the following advantages: By providing multiple accommodating slots within the housing body to hold bare battery cells, an integrated design of multiple cells can be achieved, improving space utilization and resulting in a more compact overall structure. Gaps between the accommodating slots effectively prevent heat accumulation between the cells, improving heat dissipation and ensuring more reliable temperature control during operation. Electrical connections are used between the terminals of the bare cells in adjacent accommodating slots, simplifying the electrical connection structure, reducing the number of connecting components, lowering production costs, and improving connection reliability. The overall structural design is reasonable, ensuring effective connection between the cells while facilitating assembly and maintenance, thus improving the product's practicality and maintainability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained as provided without creative effort.

[0021] Figure 1 This is a schematic diagram of the cylindrical battery cell housing in one embodiment of the present invention;

[0022] Figure 2 This is a bottom view of the cylindrical battery cell housing in one embodiment of the present invention;

[0023] Figure 3 This is an exploded view of a cylindrical battery cell in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the cylindrical battery cell in one embodiment of the present invention.

[0025] Among them, 1-shell body, 11-opening, 12-gap, 13-base plate, 14-first explosion-proof valve, 2-bare battery cell, 21-second explosion-proof valve, 22-liquid injection hole assembly, 23-winding core, 24-positive terminal, 25-negative terminal. Detailed Implementation

[0026] The following is a more detailed description of a cylindrical battery cell housing and a cylindrical battery cell according to the present invention, with reference to the schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and is not intended to limit the present invention.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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.

[0028] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer as will be explained below. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0029] Example 1

[0030] In this embodiment, please refer to Figure 1 and Figure 2 A cylindrical battery cell housing is provided, comprising: a housing body 1, wherein the housing body 1 is provided with a plurality of receiving slots for accommodating bare battery cells 2; the receiving slots are spaced apart by a gap 12, and the terminals of the bare battery cells 2 in adjacent receiving slots are electrically connected.

[0031] Specifically, the housing body 1 refers to the main body of the entire casing, which forms an integral structural framework. Multiple independent cavities or spaces are designed within the housing; these accommodating slots are used to individually house and protect the individual bare battery cells 2. The gap 12 refers to the distance or interval between the various accommodating slots. This design ensures that each battery cell has sufficient space to prevent them from contacting each other or being subjected to unnecessary pressure. Electrical connection means that the bare battery cells 2 in two adjacent accommodating slots are electrically connected through their terminals (positive and negative). This connection method facilitates the series or parallel combination of battery packs, thereby improving the overall voltage or capacity output.

[0032] Furthermore, the shell body 1 is a one-piece molded structure.

[0033] Because there are no seams or connection points, the unibody structure is more robust under external forces, providing better protection for the internal battery cells. Unibody molding also ensures better casing sealing, preventing damage to the internal battery cells from external environments such as moisture and dust. The unibody molding process typically simplifies production processes, improves efficiency, and reduces costs. Furthermore, unibody molding allows for more precise control over product size and shape, ensuring that the position and size of each receiving slot meet design requirements.

[0034] Furthermore, the housing body 1 includes a base plate 13, and the receiving groove is placed on a first surface of the base plate 13.

[0035] Specifically, the bottom of the housing body 1 is provided with a base plate 13, which is part of the housing and is used to support and fix the receiving slot. Since the receiving slot is located on the base plate 13, a fixing structure can be designed on the base plate 13, making the installation and replacement of the battery cell more convenient. The base plate 13 can provide stable support for the battery cell, reduce the movement of the battery cell within the housing, and thus improve the stability of the overall structure. As a heat dissipation surface, it helps the battery cell to dissipate heat better, especially when the heat generated by the battery cell during operation needs to be effectively dissipated. It also increases the protection of the bottom of the housing, preventing the battery cell from being impacted or damaged from the bottom.

[0036] Furthermore, the base plate 13 is also provided with a plurality of first explosion-proof valves 14, which are placed on the second surface of the base plate in the receiving groove, and the second surface is disposed opposite to the first surface.

[0037] Furthermore, the base plate 13 is also provided with a plurality of first explosion-proof valves 14, which are placed on the second surface of the base plate 13 within the receiving slot. Specifically, the first explosion-proof valves 14 and the receiving slots are in a one-to-one correspondence on the base plate 13, with each receiving slot having a first explosion-proof valve 14 in its bottom area. The base plate 13 has a first surface and a second surface, wherein the first surface faces the interior of the receiving slot and is used to support the bare battery cell, while the second surface is located on the outside of the base plate 13. The first explosion-proof valves 14 are disposed on the second surface of the base plate 13 and communicate with the interior space of the corresponding receiving slot through a pre-reserved through hole on the base plate 13. This design allows the pressure to be transmitted to the first explosion-proof valves 14 on the second surface of the base plate 13 when an abnormal situation occurs in the bare battery cell within the receiving slot, causing an increase in internal pressure. When the pressure exceeds a preset threshold, the first explosion-proof valves 14 will open, releasing the abnormal pressure in time and preventing the battery cell from exploding. Meanwhile, since the first explosion-proof valve 14 is located on the outside of the base plate 13, it will not occupy the internal space of the accommodating slot, which is conducive to improving space utilization and facilitating the inspection and maintenance of the explosion-proof valve.

[0038] When the internal pressure of the battery cell abnormally increases due to overcharging, over-discharging, external short circuits, or other reasons, the first explosion-proof valve 14 automatically opens to release the internal pressure, thereby preventing the battery cell casing from exploding due to excessive pressure. By releasing pressure, the first explosion-proof valve 14 helps protect the internal chemicals and structure of the battery cell from damage, thus extending the battery cell's lifespan to some extent. In the event of a battery cell failure, the first explosion-proof valve 14 can significantly reduce the safety risks to the surrounding environment and personnel.

[0039] The first explosion-proof valve 14 is placed on the base plate 13 so that it will not interfere with other components of the battery cell housing (such as poles, connectors, etc.), thus ensuring the compactness of the design and the integrity of the function.

[0040] Furthermore, the receiving groove forms an opening 11 at its top end away from the bottom plate 13.

[0041] For details, please refer to Figure 1 Each receiving slot has an open top, not a closed one, designed to facilitate the insertion and removal of bare cells 2 (i.e., cells without external packaging or casing). Bare cells 2 typically refer to the electrode and electrolyte portions of the cell, which need to be safely stored within a certain space.

[0042] Example 2

[0043] This embodiment provides a cylindrical battery cell; please refer to [reference needed]. Figure 2 and Figure 3 The battery cell housing is as described in any of the above embodiments, and also includes a plurality of bare battery cells 2, which are respectively disposed in the receiving groove.

[0044] This embodiment provides a complete solution for cylindrical battery cells, which includes not only a housing for accommodating and protecting the bare cell 2, but also the bare cell 2 actually stored inside the housing. This design allows for efficient electrical connection of the cells inside the housing, while also facilitating maintenance and replacement. This structure enables optimized layout of the battery pack, improving its overall performance and reliability. Each bare cell 2 is placed in a corresponding receiving slot within the housing body 1. Each receiving slot is specifically designed to accommodate one bare cell 2, ensuring stable and safe storage of the cell inside the housing.

[0045] Furthermore, the terminals of the bare battery cells 2 in the receiving slot are connected in series, in parallel, or in a series-parallel connection via connecting pieces.

[0046] For details, please refer to Figure 3 The bare cell 2 has a positive terminal 24 and a negative terminal 25, and the terminals of the cell are connected by a connecting piece.

[0047] In this context, series connection refers to connecting the positive terminal of one battery cell to the negative terminal of another, forming a continuous current path and thus increasing the overall voltage. The total voltage of a series-connected battery pack is the sum of the voltages of its individual cells, while the capacity remains constant.

[0048] Parallel connection refers to connecting the positive terminals of battery cells to each other and the negative terminals to each other. This increases the overall current output capability while maintaining a constant voltage. The total capacity of a battery pack connected in parallel is the sum of the capacities of the individual cells, while the voltage remains constant.

[0049] Series-parallel connection is a more complex connection method that combines the characteristics of series and parallel connections. In this configuration, some cells are connected in series to increase the voltage, and then these series-connected cell groups are connected in parallel to increase the current output. Series-parallel connection can simultaneously increase the voltage and capacity of the battery pack.

[0050] In the cylindrical cell housing design, the terminals between bare cells 2 can be connected in series, parallel, or series-parallel configurations using connecting tabs to achieve different electrical performance requirements. This design provides flexibility, allowing the electrical characteristics of the battery pack to be configured according to specific application needs.

[0051] Furthermore, the bare battery cell 2 includes:

[0052] Core 23;

[0053] Liquid injection hole assembly 22 is provided on the core 23;

[0054] The pole is disposed on the core 23 and passes through the injection hole assembly 22.

[0055] The core 23 is the core component of the bare cell 2, typically composed of positive electrode material, negative electrode material, and a separator wound together. The core 23 is crucial for energy storage, storing and releasing electrical energy through electrochemical reactions. The electrolyte injection port assembly 22, located on the core 23, is used to inject electrolyte during cell manufacturing. The electrolyte is a vital component inside the cell, providing the medium for ion transport, allowing current to flow between the positive and negative electrodes. The design of the electrolyte injection port assembly 22 ensures uniform distribution of the electrolyte throughout the core 23. The terminals are the two end structures of the cell, used for electrical connections between the cell and other cells or external circuits. Each bare cell 2 has at least one positive terminal and one negative terminal, connected to the positive and negative electrodes of the cell, respectively. The design of the terminals must consider both the reliability of the electrical connections and the mechanical stability.

[0056] Furthermore, the injection hole assembly 22 includes a sealing cap and an injection hole disposed on the sealing cap, the sealing cap being connected to and sealing one end of the core 23;

[0057] The injection hole penetrates the sealing cap, forming a channel connecting the inside of the core 23, for injecting electrolyte into the core 23;

[0058] The sealing cap forms a sealed connection with the inner wall edge of the receiving groove, and the bare battery cell 2 is fixed in the receiving groove by the sealing cap.

[0059] Specifically, the electrolyte injection port assembly 22 is a key sealing structure in battery assembly, its core consisting of a sealing cap and an injection port penetrating the cap. The sealing cap forms a permanent sealed connection with the end of the bare cell (electrode assembly) through laser welding or elastic interference fit, achieving a sealed working environment for the electrolyte. The precisely drilled columnar injection port on the sealing cap serves as a directional flow channel, its diameter optimized by fluid dynamics, enabling efficient electrolyte injection in vacuum-assisted injection processes. The edge of the sealing cap has an annular sealing flange or rubber ring groove, which forms a secondary sealing interface with the stepped inner wall of the battery casing receiving groove using ultrasonic welding or hot melt adhesive bonding technology. Through mechanical restraint, the bare cell is stably constrained within the casing, while simultaneously constructing multiple leak-proof barriers.

[0060] Furthermore, the bare battery cell 2 also includes a second explosion-proof valve 21, which is disposed on the sealing cover.

[0061] The second explosion-proof valve 21 is typically installed on the side or top of the battery cell. It automatically releases pressure when the internal pressure of the battery cell abnormally increases, preventing the cell from exploding due to overpressure. This design enhances the safety of the battery cell under abnormal conditions. When the internal pressure of the battery cell rises to a certain level due to overheating, overcharging, short circuit, or other reasons, the explosion-proof valve is activated. Once the preset pressure threshold is reached, the explosion-proof valve automatically opens, releasing the internal pressure of the battery cell, thereby preventing the battery cell casing from rupturing or exploding. By releasing pressure, the explosion-proof valve protects the battery cell and its surrounding environment from damage, while also protecting the safety of the user.

[0062] In summary, the integrated shell structure enhances overall strength and stability, the first explosion-proof valve on the base plate improves safety, and the open design at the top of the receiving slot facilitates installation and maintenance. The terminals of the bare cells achieve flexible electrical connections through connecting pieces, improving the electrical performance of the battery pack. The second explosion-proof valve built into the bare cells further enhances safety protection, and the sealing design of the liquid injection hole assembly ensures the stability and leak-proof performance of the cells within the receiving slot, thereby improving the overall reliability, safety, and lifespan of the battery pack.

[0063] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A cylindrical cell casing, characterized by, include: The housing body has multiple receiving slots for accommodating bare battery cells; the receiving slots are spaced apart. The housing body includes a base plate, and the receiving groove is placed on a first surface of the base plate; the receiving groove forms an opening away from the top of the base plate.

2. The cylindrical cell case according to claim 1, wherein, The shell body is a one-piece molded structure.

3. The cylindrical cell case according to claim 2, wherein The base plate is also provided with a plurality of first explosion-proof valves, which are placed on the second surface of the base plate in the receiving groove, and the second surface is disposed opposite to the first surface.

4. A cylindrical cell characterized by, The cylindrical battery cell housing as described in any one of claims 1-3 further includes a plurality of bare battery cells, each of which is disposed in a receiving groove.

5. The cylindrical cell of claim 4, wherein, The terminals of the bare cells in the receiving slot are connected in series, in parallel, or in a series-parallel connection via connecting pieces.

6. The cylindrical cell of claim 5, wherein, The bare battery cell includes: Core; Liquid injection hole assembly provided on the winding core; The pole is disposed on the core and passes through the injection hole assembly.

7. The cylindrical cell of claim 6, wherein, The injection hole assembly includes a sealing cap and an injection hole disposed on the sealing cap, the sealing cap being connected to and sealing one end of the core; The electrolyte is injected through the sealing cap to form a channel connecting the inside of the core, for injecting electrolyte into the core; The sealing cap forms a sealed connection with the inner wall edge of the receiving groove, and the bare battery cell is fixed in the receiving groove by the sealing cap.

8. The cylindrical cell of claim 7, wherein, The bare battery cell also includes a second explosion-proof valve, which is disposed on the sealing cover.

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