Battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery and electric equipment. Comprising a naked battery cell and a protective film for accommodating the naked battery cell, the naked battery cell comprises a pole piece, and a tab is arranged on the pole piece; the outer surface area, corresponding to the tab, of the protective film is an avoiding area, the outer surface area of the protective film is covered with a thickening layer, and the thickening layer is arranged to avoid the avoiding area; by using the outer surface area of the protective film corresponding to the tab as the avoiding area, when the outer surface area of the protective film is covered with the thickening layer, the thickening layer is arranged to avoid the avoiding area, so that the overall thickness of the battery covered with the thickening layer is more consistent, local tab overvoltage caused by uneven thickness of the battery is effectively prevented, and the reliability of the battery is improved. The overall energy density of the battery is effectively improved, and the cycle performance of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology

[0002] For handheld and wearable lithium-ion batteries, the design and manufacturing process faces the challenge of ensuring battery performance and energy density while guaranteeing battery safety under external forces such as drops. A common method is to apply hot melt adhesive tape to the outside of the battery. In traditional battery manufacturing methods, evenly distributed hot melt adhesive tape is often used.

[0003] Because the thickness of the battery core is inconsistent, uniformly setting the hot melt adhesive tape can easily lead to uneven thickness of the battery at positions such as the tabs compared to other positions, thus affecting the overall energy density of the battery. Furthermore, uneven thickness distribution can easily lead to local overvoltage of the battery electrodes, affecting the long-term cycle life of the battery.

[0004] Therefore, designing a battery and electrical device that can guarantee battery performance and energy density while maintaining safety is of paramount importance to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model embodiment is to provide a battery and electrical device that can ensure battery performance and energy density while maintaining safety, so as to solve the problem of local electrode overvoltage in the battery affecting the overall energy density and long-term cycle life of the battery in the prior art.

[0006] This utility model discloses a battery, which includes a bare cell and a protective film for accommodating the bare cell; the bare cell includes an electrode sheet with a tab on it; the outer surface area of ​​the protective film corresponding to the tab is a clearance area, and the outer surface area of ​​the protective film is covered with a thickening layer that avoids the clearance area.

[0007] Optionally, the thickening layer is a pressure-sensitive adhesive tape bonded to the outer surface of the protective film.

[0008] Optionally, the protective film is made of aluminum-plastic film.

[0009] Optionally, the adhesive force of the pressure-sensitive tape is greater than or equal to 0.25 N / mm.

[0010] Optionally, the outer surface of the tab is covered with an insulating layer, the insulating layer at least covering the portion of the tab connected to the electrode plate, and the clearance area also includes the outer surface area of ​​the protective film corresponding to the insulating layer.

[0011] Optionally, the width of the battery is less than or equal to 40 mm.

[0012] To address the problems existing in the prior art, this utility model also provides an electrical device, the solution of which is to use a battery as described in any of the above-mentioned embodiments.

[0013] To address the problems existing in the prior art, this utility model also provides an electrical device, wherein the device employs a battery as described in any of the above-mentioned embodiments, and the battery is bonded to the electrical device by the pressure-sensitive adhesive tape.

[0014] Compared with the prior art, the beneficial effects of the battery provided by this utility model embodiment are as follows: by using the outer surface area of ​​the protective film corresponding to the tab as the avoidance area, when the thickening layer is covered on the outer surface area of ​​the protective film, the thickening layer is set to avoid the avoidance area, which makes the overall thickness of the battery covered with the thickening layer more uniform, thereby effectively preventing local tab overvoltage caused by uneven thickness of the battery, and effectively improving the overall energy density of the battery and improving the cycle performance of the battery. Attached Figure Description

[0015] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0016] Figure 1 This is a three-dimensional schematic diagram of the battery provided in an embodiment of this utility model.

[0017] The labels for the attached figures are as follows:

[0018] 100. Bare battery cell; 200. Protective film; 300. Thickened layer; 210. Clearance area; 111. Tab; 112. Insulation layer. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] like Figure 1 As shown, this utility model provides a specific embodiment of a battery.

[0021] A type of battery, reference Figure 1 The battery includes a bare cell 100 and a protective film 200 that houses the bare cell 100. The bare cell 100 includes an electrode 110, on which a tab 111 is provided. The outer surface area of ​​the protective film 200 corresponding to the tab 111 is a clearance area 210. The outer surface area of ​​the protective film 200 is covered with a thickening layer 300, which is disposed away from the clearance area 210.

[0022] Specifically, refer to Figure 1The bare cell 100 is the core component of the battery. As the energy storage unit of the battery, it can store electrical energy for later use. When the battery is charging, the bare cell 100 converts electrical energy into chemical energy for storage. When energy needs to be released, the bare cell 100 converts the stored chemical energy into electrical energy to supply external devices. The safety and stability of the bare cell 100 directly affect the quality of the battery. The protective film 200 is wrapped around the bare cell 100 to protect it.

[0023] The thickened layer 300 is used to ensure the safety of the bare cell under external forces such as drops. The energy storage and release of the bare cell 100 depends on the electrode 110, which is responsible for electron flow and ion transfer. The electrode 110 is provided with tabs 111 to connect the internal and external circuits of the bare cell 100, so as to realize the energy transfer between the bare cell 100 and the external circuit. Since the tabs 111 themselves have a certain thickness, when the tabs 111 are placed on the electrode 110, the area on the outer surface of the protective film 200 corresponding to the position of the tabs 111 will protrude outward more. If the thickened layer 300 covers the entire outer surface of the protective film 200, the thickness of the entire battery will be uneven, which will affect the overall energy density of the battery. Moreover, the uneven battery thickness is prone to local overvoltage of the tabs 111, affecting the cycle life of the battery.

[0024] In this embodiment, the outer surface area of ​​the protective film 200 corresponding to the tab 111 is used as the avoidance area 210. When the thickening layer 300 is covered on the outer surface area of ​​the protective film 200, the thickening layer 300 is set to avoid the avoidance area 210, which can make the overall thickness of the battery covered with the thickening layer 300 more uniform, thereby effectively preventing local overvoltage of the tab 111 caused by uneven thickness of the battery, and effectively improving the overall energy density of the battery and improving the cycle performance of the battery.

[0025] In one embodiment, the thickening layer 300 is a pressure-sensitive adhesive tape bonded to the outer surface of the protective film 200. The pressure-sensitive adhesive tape can play a role in shock absorption and cushioning, so as to reduce the risk of battery damage when subjected to external impact or vibration, and improve the reliability and stability of the battery. In addition, the pressure-sensitive adhesive tape is self-adhesive and can easily adhere to the surface of the protective film 200 without the need for additional glue or tools, making the manufacturing process more efficient and convenient.

[0026] In one embodiment, the adhesive force of the pressure-sensitive tape is greater than or equal to 0.25 N / mm. Adhesive force has an important impact on stability. Excessive adhesive force will affect the heat dissipation of the entire battery, hindering the transfer and dissipation of heat and causing the battery to overheat. Insufficient adhesive force can easily lead to unstable connection, making it easy to fall off when subjected to external impact or vibration, thus affecting the protection effect.

[0027] In one embodiment, the protective film 200 is made of aluminum-plastic film. Aluminum-plastic film has good oxidation barrier properties, effectively preventing oxygen from the air from entering the battery cell, reducing oxidation and corrosion of internal metal components, and thus extending battery life. Furthermore, aluminum-plastic film also has good sealing properties, effectively preventing electrolyte leakage and avoiding short circuits or other safety issues. Additionally, aluminum-plastic film has certain insulation properties, isolating the positive and negative electrodes inside the battery cell to some extent, preventing short circuits and improving battery safety. Moreover, aluminum-plastic film is relatively lightweight, not adding excessive weight to the battery, which helps maintain a lightweight design. Finally, aluminum-plastic film has relatively low cost, which helps reduce battery production costs.

[0028] In one embodiment, the outer surface of the tab 111 is covered with an insulating layer 112, which at least covers the portion of the tab 111 connected to the electrode 110, and the clearance area 210 also includes the outer surface area of ​​the protective film 200 corresponding to the insulating layer 112.

[0029] Specifically, refer to Figure 1 Since the insulating layer 112 itself has a certain thickness, when the insulating layer 112 is placed on the area where the tab 111 is connected to the electrode 110, the outer surface area of ​​the protective film 200 corresponding to the insulating layer 112 will also protrude outward. Therefore, when the thickening layer 300 covers the outer surface area of ​​the protective film 200 corresponding to the insulating layer 112, the thickening layer 300 avoids the outer surface area of ​​the protective film 200 corresponding to the insulating layer 112, which makes the overall thickness of the battery covered with the thickening layer 300 more uniform.

[0030] In one embodiment, the width of the battery is less than or equal to 40mm. For narrow batteries, the design of their protection structure is more difficult. By setting the thickened layer 300 in the above manner, the protection of narrow batteries can be made simpler and more stable.

[0031] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. A battery, characterized in that, It includes a bare battery cell and a protective film that houses the bare battery cell; the bare battery cell includes an electrode sheet with a tab on it; the outer surface area of ​​the protective film corresponding to the tab is a clearance area, and the outer surface area of ​​the protective film is covered with a thickening layer that avoids the clearance area.

2. The battery according to claim 1, characterized in that, The thickening layer is a pressure-sensitive adhesive tape bonded to the outer surface of the protective film.

3. A battery according to claim 2, characterized in that, The protective film is made of aluminum-plastic film.

4. A battery according to claim 3, characterized in that, The adhesive force of the pressure-sensitive tape is greater than or equal to 0.25 N / mm.

5. A battery according to claim 1, characterized in that, The outer surface of the tab is covered with an insulating layer, which at least covers the portion of the tab connected to the electrode plate. The clearance area also includes the outer surface area of ​​the protective film corresponding to the insulating layer.

6. A battery according to claim 1, characterized in that, The width of the battery is less than or equal to 40 mm.

7. An electrical appliance, characterized in that, The battery described in any one of claims 1-6 is used.

8. An electrical appliance, characterized in that, The battery described in any one of claims 2-3 is used, and the battery is bonded to the electrical device by the pressure-sensitive adhesive tape.

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