Battery monomer, battery pack and power utilization device

Abstract

The utility model provides a single battery, a battery pack and an electric device. The single battery comprises a cover plate, a negative pole and a protective sleeve, the negative pole is provided with an end part penetrating through the cover plate, and the protective sleeve is sleeved on the end part and is attached to the cover plate to form a seal between the cover plate and the negative pole. According to the single battery disclosed by the utility model, the protective sleeve is sleeved at the end part of the negative pole and is attached to the cover plate, so that a gap between the negative pole and the cover plate can be sealed, and external water vapor cannot be condensed between the negative pole and the cover plate to generate a water film, so that the single battery can be sealed without external sealing protection; good corrosion resistance can also be achieved, and the use safety of the battery monomer is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a single battery cell. This utility model also relates to a battery pack equipped with the aforementioned battery cell, and an electrical device equipped with the aforementioned battery pack. Background Technology

[0002] Traditional battery packs are sealed by bolting together an upper and lower casing to prevent moisture from affecting the individual cells inside the pack, especially in rainy or damp environments. However, with the rapid development of new energy sources, the demand for lithium-ion batteries is increasing daily. To meet market demands, enhance competitiveness, and reduce production costs, reducing production costs has become a crucial aspect of research and development. One cost-reducing battery pack design is the absence of a top casing, which significantly lowers costs.

[0003] A single battery cell consists of electrode arrays, a casing, and a cover. The casing is divided into a neutral casing and a charged casing. Compared to the charged casing, the neutral casing mainly improves the safety of the cell and module manufacturing process, and also reduces the risk of thermal runaway caused by arcing due to short circuits during the use of the entire battery pack. However, using a neutral casing in a battery pack without a top casing can lead to corrosion and leakage problems. This is mainly because moisture in the air can create a micro-short circuit between the negative terminal and the cover, resulting in poor side voltage. When the voltage reaches the corrosion potential of the cover, it corrodes, causing leakage from the battery cell and affecting its safety. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery cell to improve the safety of battery cell use.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A battery cell includes a cover plate, a negative terminal post, and a protective sleeve;

[0007] The negative electrode post has an end that passes through the cover plate, and the protective sleeve is fitted onto the end and fits against the cover plate to form a seal between the cover plate and the negative electrode post.

[0008] Furthermore, the protective sleeve has a guiding slope on the side away from the cover plate, and the distance between the guiding slope and the cover plate gradually decreases in the direction away from the negative electrode post.

[0009] Furthermore, the angle between the guide slope and the cover plate is 30 degrees to 60 degrees.

[0010] Furthermore, the outer ring of the protective sleeve extends in a direction away from the negative electrode post to form an extension portion, which fits against the cover plate.

[0011] Furthermore, the protective sleeve is tightened onto the negative terminal post due to its own deformation.

[0012] Furthermore, the protective sleeve is made of polyimide.

[0013] Furthermore, the cover plate includes a main body plate and an insulating patch;

[0014] The insulating patch is attached to one side of the cover plate and contacts the protective sleeve.

[0015] Furthermore, the thickness of the protective sleeve in the direction of extension of the negative electrode post is 1.1 mm to 1.5 mm.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] The battery cell described in this utility model, by fitting a protective sleeve over the end of the negative terminal, which fits snugly against the cover plate, seals the gap between the negative terminal and the cover plate. This prevents external moisture from condensing and forming a water film between the negative terminal and the cover plate, giving the battery cell good corrosion resistance even without external sealing protection, thus improving the safety of the battery cell. Furthermore, the installation of the protective sleeve is relatively simple. In practical applications, only modifications to a conventional battery cell production line are required. The modification cost for adding the protective sleeve installation step is low, installation is convenient, and it does not affect the original production line's cycle time.

[0018] By setting a guide slope on the protective sleeve, condensation can be guided and dispersed when it occurs between the negative terminal and the cover plate, preventing condensation from accumulating and lingering for a long time, thus reducing the risk of short circuit between the negative terminal and the cover plate.

[0019] Setting the angle between the guide slope and the cover plate to 30 degrees to 60 degrees can give the guide slope a better water-repellent effect.

[0020] The outward extension of the outer ring of the protective sleeve increases the contact area between the protective sleeve and the cover plate, improves the sealing between the protective sleeve and the cover plate, and makes it more difficult for external moisture to enter the gap between the negative electrode post and the cover plate.

[0021] The protective sleeve is secured to the negative terminal by its own deformation, which allows for a relatively firm installation without the need for other fixing structures. It is also more convenient to install and easier to modify the processes of existing production lines.

[0022] The protective sleeve is made of polyimide. Polyimide has good high temperature resistance, up to 400℃, and can withstand high temperatures without aging or deformation during the charging and discharging of the battery cells and the subsequent high temperatures generated during busbar welding, resulting in a long service life. At the same time, polyimide also has a certain degree of elasticity and good toughness, which makes it easy to assemble with the negative terminal post and also allows for a smaller assembly gap required for the protective sleeve, resulting in a tighter fit with the terminal post.

[0023] By setting insulating patches on the main body plate, the cover plate can be insulated and protected, preventing short circuits between the cover plate and external circuits. It also provides protection, making it less likely for external objects to scratch the main body plate. At the same time, the insulating patches and the cover plate have more sufficient contact with the protective sleeve, which can improve the sealing effect.

[0024] The thickness of the protective sleeve in the direction of the negative electrode post is set to 1.1 mm to 1.5 mm. This ensures that the protective sleeve can seal the gap between the negative electrode post and the cover plate, while also allowing for end allowance of the negative electrode post to facilitate the subsequent stacking and assembly of battery cells.

[0025] Another objective of this invention is to provide a battery pack, wherein the battery pack is equipped with the battery cells as described above.

[0026] The battery pack described in this utility model, by setting the aforementioned battery cells, can achieve good corrosion resistance even when using a shell-less structure, thereby improving the safety of the battery pack and also helping to control the cost of the battery pack.

[0027] Another objective of this invention is to provide an electrical device equipped with a battery pack as described above.

[0028] The electrical device described in this utility model can achieve better electrical safety performance by setting the above-mentioned battery pack; the absence of an upper shell for the battery pack can also reduce the overall weight of the electrical device and reduce the cost of using the battery pack. Attached Figure Description

[0029] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of the battery cell described in Embodiment 1 of this utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the protective sleeve described in Embodiment 1 of this utility model;

[0032] Figure 3 for Figure 2 Cross-sectional view at point AA.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Cover plate;

[0035] 101. Main body plate; 102. Insulating patch;

[0036] 2. Negative terminal;

[0037] 3. Protective cover;

[0038] 301. Guiding slope; 302. Extension section;

[0039] 4. Shell. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0043] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] Example 1

[0045] This embodiment relates to a battery cell to improve the safety of battery cell use.

[0046] In terms of overall structure, the battery cell in this embodiment includes a cover plate, a negative terminal post, and a protective sleeve.

[0047] The negative terminal has an end that passes through the cover plate. A protective sleeve is fitted onto the end and fits against the cover plate, forming a seal between the cover plate and the negative terminal.

[0048] As described above, in this embodiment, the battery cell, by fitting a protective sleeve over the end of the negative terminal, and with the sleeve fitting snugly against the cover plate, seals the gap between the negative terminal and the cover plate, preventing external moisture from condensing and forming a water film between them. Even without external sealing protection, the battery cell maintains good corrosion resistance when exposed to external moisture, improving its safety. Furthermore, installing the protective sleeve is relatively simple. In practical applications, only modifications to a conventional battery cell production line are required. The modification cost for adding the protective sleeve is low, installation is convenient, and it does not affect the existing production line's cycle time.

[0049] Based on the above overview, refer to Figure 1 As shown, specifically, this embodiment takes a battery cell with terminals on both sides as an example. A cover plate 1 is mounted on the battery cell's housing 4. The negative terminal 2 passes through the cover plate 1 from the inside, forming a protruding connection end for connecting to the circuit. The negative terminal 2 is a cuboid, and a protective sleeve 3 is tightly fitted along the outer circumference of the negative terminal 2 and abuts against the cover plate 1, sealing the gap between the negative terminal 2 and the cover plate 1. Of course, the battery cell can also have terminals on the same side without affecting the protective effect of the protective sleeve 3 on the gap between the negative terminal 2 and the cover plate 1.

[0050] Secondly, in order to reduce the accumulation of condensation on the battery cells between the cover plate 1 and the negative electrode post 2, refer to Figures 1 to 3 As shown, the protective sleeve 3 has a guiding slope 301 on the side away from the cover plate 1, and the distance between the guiding slope 301 and the cover plate 1 gradually decreases along the direction away from the negative electrode post 2. The guiding slope 301 on the protective sleeve 3 can guide and disperse condensation when it occurs between the negative electrode post 2 and the cover plate 1, preventing condensation from accumulating and remaining for a long time, thus reducing the risk of short circuit between the negative electrode post 2 and the cover plate 1. It should be noted that the guiding slope 301 can be either a plane or a curved surface; that is, the guiding slope 301 can be convex or concave. However, the effect of dispersing condensation is not as good as that of a planar guiding slope 301. Therefore, this embodiment uses a planar guiding slope 301.

[0051] Specifically, regarding the angle setting of the guide slope 301, the included angle between the guide slope 301 and the cover plate 1 is 30 degrees to 60 degrees. Because the protective sleeve 3 is attached to the cover plate 1, its bottom surface is flat. Figure 3The angle b between the guide slope 301 and the bottom surface of the protective sleeve 3 is equal to the angle between the guide slope 301 and the cover plate 1. When b is between 30 and 60 degrees, the guide slope 301 has a good water-repellent effect. If b is less than 30 degrees or greater than 60 degrees, the water-repellent effect of the guide slope 301 will be poor. Preferably, in this embodiment, the angle between the guide slope 301 and the cover plate 1 is 45 degrees.

[0052] Meanwhile, to ensure full contact between the protective sleeve 3 and the cover plate 1, the outer ring of the protective sleeve 3 extends away from the negative electrode post 2 to form an extension portion 302, which fits snugly against the cover plate 1. The outwardly extending extension portion 302 on the outer ring of the protective sleeve 3 increases the contact area between the protective sleeve 3 and the cover plate 1, improving the sealing between them and making it more difficult for external moisture to enter the gap between the negative electrode post 2 and the cover plate 1. Regarding the size of the extension portion 302, it is sufficient that its edge does not extend beyond the edge of the cover plate 1 after the protective sleeve 3 is installed. There are no restrictions on the cross-sectional shape of the extension portion 302, as long as it fits tightly against the cover plate 1. In this embodiment, the cross-section of the extension portion 302 is rectangular.

[0053] Furthermore, to simplify the installation method of the protective sleeve 3, in this embodiment, the protective sleeve 3 is tightened onto the negative terminal 2 due to its own deformation. The protective sleeve 3's self-deformation tightens it onto the negative terminal 2, allowing for a more secure installation without the need for other fixing structures. This also makes installation more convenient and facilitates process modification on existing production lines. Alternatively, adhesive can be applied to the protective sleeve 3 to bond it to the cover plate 1 and / or the negative terminal 2; the connection is equally secure, but installation is less convenient.

[0054] Regarding the specific material selection for the protective sleeve 3, in this embodiment, the protective sleeve 3 is made of polyimide. Polyimide is used because it has good high-temperature resistance, reaching up to 400℃. It can withstand high temperatures during the charging and discharging of the battery cells, as well as the high temperatures generated during subsequent busbar welding, without aging or deformation, resulting in a long service life. Simultaneously, polyimide also has a certain degree of elasticity and good toughness, facilitating assembly with the negative electrode post 2 and allowing for a smaller assembly gap and a tighter fit with the electrode post. It should be noted that the protective sleeve 3 can also be made of other materials, but the selected material must meet the requirements of high-temperature resistance and elasticity to effectively protect the battery cells.

[0055] Furthermore, to further improve the safety of the battery cells, the cover plate 1 includes a main plate 101 and an insulating patch 102. The insulating patch 102 is attached to one side of the cover plate 1 and contacts the protective sleeve 3. By providing the insulating patch 102 on the main plate 101, the cover plate 1 can be insulated and protected, preventing short circuits between the cover plate and external circuits. It also provides protection, making it less likely for external objects to scratch the main plate 101. Similarly, the contact between the insulating patch 102 and the cover plate 1 and the protective sleeve 3 is sufficient, which improves the sealing effect.

[0056] In addition, to ensure proper installation of the battery cells, the thickness 'a' of the protective sleeve 3 in the extension direction of the negative terminal post 2 is 1.1 mm to 1.5 mm. For some types of battery cells, the negative terminal post 2 needs to be snapped into the corresponding structural component during assembly. Therefore, setting the thickness of the protective sleeve 3 in the extension direction of the negative terminal post 2 to 1.1 mm to 1.5 mm ensures both the sealing effect of the protective sleeve 3 on the gap between the negative terminal post 2 and the cover plate 1, and also allows for end allowance of the negative terminal post 2 to snap into the corresponding mounting structure, facilitating the subsequent stacking and assembly of battery cells.

[0057] In this embodiment, the battery cell, by fitting a protective sleeve 3 over the end of the negative terminal 2, and having the protective sleeve 3 adhere to the cover plate 1, seals the gap between the negative terminal 2 and the cover plate 1. This prevents external moisture from condensing between the negative terminal 2 and the cover plate 1, thus preventing the battery cell from forming a water film. This allows the battery cell to have good corrosion resistance even without external sealing protection, improving its safety. Furthermore, the guide slope 301 on the protective sleeve 3 guides and disperses condensation when it occurs between the negative terminal 2 and the cover plate 1, preventing condensation from accumulating and remaining for extended periods, further reducing the risk of short circuits between the negative terminal 2 and the cover plate 1.

[0058] Example 2

[0059] This embodiment relates to a battery pack, which includes the battery cells of Embodiment 1.

[0060] The battery pack in this embodiment adopts a shell-less structure to reduce the production cost of the battery pack. The battery cells inside the battery pack are in direct contact with the external environment. By using the battery cells of Embodiment 1, the battery cells can have good corrosion resistance even without external sealing protection, which can improve the safety of the battery pack and also help control the cost of the battery pack.

[0061] Example 3

[0062] This embodiment relates to an electrical device, which is equipped with the battery pack of Embodiment 2.

[0063] The electrical device in this embodiment, by incorporating the battery pack of Embodiment 2, not only reduces the overall weight of the electrical device and the cost of using the battery pack, but also provides better electrical safety performance.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cell, characterized in that, include: Cover plate, negative terminal post, and protective sleeve; The negative electrode post has an end that passes through the cover plate, and the protective sleeve is fitted onto the end and fits against the cover plate to form a seal between the cover plate and the negative electrode post.

2. The battery cell according to claim 1, characterized in that: The protective sleeve has a guiding slope on the side away from the cover plate, and the distance between the guiding slope and the cover plate gradually decreases in the direction away from the negative electrode post.

3. The battery cell according to claim 2, characterized in that: The angle between the guide ramp and the cover plate is 30 degrees to 60 degrees.

4. The battery cell according to claim 2, characterized in that: The outer ring of the protective sleeve extends away from the negative electrode post to form an extension portion, which fits into the cover plate.

5. The battery cell according to claim 1, characterized in that: The protective sleeve is tightened onto the negative terminal due to its own deformation.

6. The battery cell according to claim 1, characterized in that: The protective sleeve is made of polyimide.

7. The battery cell according to claim 1, characterized in that: The cover plate includes a main plate and an insulating patch; The insulating patch is attached to one side of the cover plate and contacts the protective sleeve.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The thickness of the protective sleeve in the direction of extension of the negative electrode post is 1.1 mm to 1.5 mm.

9. A battery pack, characterized in that: The battery pack is equipped with battery cells as described in any one of claims 1 to 8.

10. An electrical device, characterized in that: The electrical device is equipped with the battery pack as described in claim 9.

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