Power battery

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By setting a protective frame at the connection between the battery casing and the cover plate, covering it with an insulating coating and overlapping it with the battery casing, the problem of the insulating coating falling off is solved, and the insulation effect and safety of the power battery are improved.

CN223843067UActive Publication Date: 2026-01-27CALB GROUP CO LTD

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Patent Information

Application Number: CN202520161364.1
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2025-01-23
Publication Date: 2026-01-27
Estimated Expiration: 2035-01-23

AI Technical Summary

Technical Problem

In existing technologies, the insulating coating at the connection between the battery casing and the cover plate is prone to peeling off, leading to battery insulation failure, which poses a significant risk, especially during vibration.

Method used

A protective frame is provided at the connection between the battery casing and the cover plate, covering the outer surface of the insulating coating and overlapping with the insulating coating of the battery casing to form a complete insulating cover. The protective frame extends to the upper surface of the battery cover plate.

Benefits of technology

This effectively prevents the insulating coating from peeling off at the connection points, improves the insulation effect on the outside of the battery, and ensures the stability and safety of the overall insulation.

✦ Generated by Eureka AI based on patent content.

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Figure CN223843067U_ABST

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Abstract

According to the power battery provided by the utility model, the outer surface of the battery shell is subjected to insulation treatment through the insulating coating, meanwhile, the protective frame covers the outer surface of the insulating coating on the connecting position and is overlapped with part of the insulating coating of the battery shell, and the protective frame extends to the upper surface of the battery cover plate from the connecting position. The surface of a bonding wire between a battery cover plate and a battery shell is rough, an insulating coating is not easy to uniformly coat the surface, and the bonding wire of the battery cover plate is a failure risk point in the vibration process of a power battery and is subjected to large vibration impact, so that the insulating coating at the bonding wire is easy to fall off, and the insulating coating at the battery shell is driven to fall off; and the battery insulation failure risk is caused. By arranging the protective frame, the insulating coating at the welding wire can be well protected, the insulating coating is prevented from falling off, meanwhile, the protective frame and the insulating coating at the battery shell are partially overlapped, the coating effect of the insulating coating is guaranteed, and finally the insulating effect of the power battery is improved.

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Description

Technical Field

[0001] This utility model belongs to the field of battery insulation technology, and specifically relates to a power battery. Background Technology

[0002] With the development of new energy power equipment (such as new energy vehicles and robots), the operating voltage and energy density have increased significantly. As the main power source, the safety and service life of batteries are greatly affected by the insulation, thus placing higher demands on battery insulation solutions.

[0003] The external structure of a battery mainly includes the battery casing and battery cover, which protect internal components such as electrode assemblies. Since the battery casing is mostly made of metal, insulation is required on the outside of the casing to prevent leakage. Currently, one method is to cover the outer surface of the battery casing with an insulating film. However, applying the insulating film to the battery surface requires repeated flipping, which is cumbersome. Another method is to spray an insulating liquid onto the outer surface of the battery casing, which forms an insulating layer after curing. However, due to manufacturing limitations, especially at the edges or corners between the battery casing and battery cover, the sprayed insulating liquid is not always able to completely cover these areas, or it may peel off during use, ultimately failing to achieve insulation in these locations.

[0004] Therefore, how to overcome the above-mentioned technical defects is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a power battery that can effectively improve the insulation effect on the outside of the power battery.

[0006] To solve the above-mentioned technical problems, this utility model provides a power battery, including a battery housing and a battery cover plate connected to the open end of the battery housing. The battery cover plate and the battery housing are welded together to form a connection position. An insulating coating is provided on the outer surface of the battery housing, and the insulating coating on the battery housing extends to the connection position.

[0007] It also includes a protective frame that covers the outer surface of the insulating coating on the connection position and overlaps with a portion of the insulating coating on the battery housing. The protective frame extends from the connection position to the upper surface of the battery cover.

[0008] This utility model provides a power battery, the advantages of which are:

[0009] The weld line surface at the connection between the battery cover and the battery casing is relatively rough, making it difficult to evenly coat the insulating coating. Furthermore, the battery cover weld line is a potential failure point during battery vibration, experiencing significant impact that can cause the insulating coating at the weld line to detach, subsequently causing the insulating coating on the battery casing to peel off, leading to battery insulation failure. By installing a protective frame, the insulating coating at the weld line can be effectively protected, further preventing detachment. Simultaneously, the partial overlap between the protective frame and the insulating coating on the battery casing ensures effective coating coverage, ultimately improving the insulation of the battery's exterior and achieving overall protection. Attached Figure Description

[0010] 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 based on the provided drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of a power battery provided in an embodiment of the present utility model;

[0012] Figure 2 A schematic diagram of the structure of the protective frame provided in this embodiment of the utility model;

[0013] Figure 3 This is a schematic diagram of the structure of the insulating top plate provided in an embodiment of the present utility model.

[0014] In the image above:

[0015] 110 - Battery casing; 120 - Battery cover; 130 - Explosion-proof valve;

[0016] 210 - Insulating coating; 220 - Protective frame; 230 - Insulating top plate. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] The core of this invention is to provide a power battery that can prevent the insulating coating from peeling off and ensure the coating effect.

[0019] To enable those skilled in the art to better understand the technical solutions provided by this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] For details, please refer to Figures 1-3 The present invention provides a power battery, comprising: a battery casing 110 and a battery cover 120. The battery casing 110 and the battery cover 120 are made of materials including but not limited to aluminum, copper, nickel, or metal alloys, specifically aluminum alloy, copper alloy, carbon steel, or stainless steel.

[0021] The battery cover 120 is connected to the open end of the battery housing 110, and the battery cover 120 and the battery housing 110 are welded together to form a connection position.

[0022] Because the connection between the battery cover 120 and the battery housing 110 is achieved by welding, the weld seam is uneven and cannot achieve a completely smooth transition, causing the insulating coating 210 sprayed at this location to easily peel off. To address this, this solution provides an insulating coating 210 on the outer surface of the battery housing 110. The insulating coating 210 can be formed by spraying or coating an insulating liquid using spraying equipment, covering the outer surface of the battery housing 110 and ensuring that the insulating coating 210 completely covers the sprayed area on the outer surface of the battery housing 110. The edge of the insulating coating 210 on the battery housing 110 can extend to the connection point between the battery housing 110 and the battery cover 120, overlapping with the battery cover 120. It should be noted that the insulating coating 210 can partially or completely cover the connection point. The insulating coating 210 includes, but is not limited to, polyethylene coatings, polyurethane coatings, epoxy resin coatings, potassium silicate coatings, and siloxane coatings.

[0023] For key areas where the insulating coating 210 is prone to peeling off, namely the connection point between the battery casing 110 and the battery cover 120, a protective frame 220 is provided to cover the outer surface of the insulating coating 210 at the connection point, overlapping with a portion of the insulating coating 210 of the battery casing 110. The protective frame 220 extends from the connection point to the upper surface of the battery cover 120, thereby ensuring that the entire outer side of the power battery is completely covered by insulating material. The protective frame 220 is made of insulating material. Specifically, the material of the insulating top plate 230 includes, but is not limited to, silicone, PET, PBS, or PI. Therefore, the insulating coating 210, the protective frame 220, and the insulating top plate 230 made of any insulating material with insulating properties are all within the scope of protection of this application and will not be elaborated upon here.

[0024] In the actual power battery manufacturing process, the battery cell assembly is first placed in the receiving cavity of the battery housing 110, and the components of the battery cell assembly are connected to the battery cover plate 120. Then, the battery housing 110 and the battery cover plate 120 are connected by welding process to facilitate welding together. The weld is the connection position. The assembled battery housing 110 and battery cover plate 120 are sprayed to form an insulating coating 210. The spraying area is distributed on the outer surface of the battery housing 110 and the edge of the battery cover plate 120 near the connection of the battery housing 110.

[0025] The power battery provided by this solution insulates the outer surface of the battery casing 110 with an insulating coating 210. At the same time, a protective frame 220 covers the outer surface of the insulating coating 210 at the connection position and overlaps with part of the insulating coating 210 of the battery casing 110. The protective frame 220 extends from the connection position to the upper surface of the battery cover 120, thereby completely covering the outer side of the entire power battery with insulating material. This prevents the insulating coating 210 from falling off at the connection position between the battery casing 110 and the battery cover 120, ensuring the coating effect of the insulating coating and ultimately effectively improving the insulation effect of the outer side of the power battery.

[0026] In a specific embodiment, the protective frame 220 can be designed to be relatively thin, with a thickness of 1.5mm-2.5mm. Specifically, the thickness of the protective frame 220 can be 1.5mm, 1.6mm, 1.7mm, 2.0mm, 2.2mm, or 2.5mm. The total length of the protective frame 220 is 2mm-30mm, specifically, the total length can be 2mm, 3mm, 4mm, 8mm, 10mm, 12mm, 15mm, or 20mm.

[0027] The protective frame 220 has a dimension of 0.2mm-25mm along the direction perpendicular to the end face of the battery cover 120. Specifically, the dimension of the protective frame 220 along the direction perpendicular to the end face of the battery cover 120 can be 0.2mm, 0.5mm, 1mm, 8mm, 15mm, 20mm, or 25mm. The size of the protective frame 220 should be adaptively selected according to the actual size of the power battery. It is important to note that the protective frame 220 must be of an appropriate size. If the size is too small, the protective frame 220 is prone to detachment, further exposing the insulating coating 210 at the welding line. If the size is too large, the overlap between the protective frame 220 and the insulating coating 210 will be large, resulting in poor surface flatness of the battery casing 110 and affecting the overall heat dissipation effect of the battery cover 120.

[0028] Based on the above specific embodiments, the overlap size of the insulating coating 210 on the protective frame 220 and the battery casing 110 is 0.3mm-20mm. Specifically, this overlap size can be 0.3mm, 0.4mm, 0.8mm, 5mm, 11mm, or 20mm. This arrangement is to avoid interference when the battery pack is stacked over a large area, and also to prevent the protective frame 220 from forming an overlapping area at the corner of the battery casing 110 and the battery cover 120.

[0029] Meanwhile, along the extension direction of the insulating coating 210, the overlap between the protective frame 220 and the battery cover 120 is 0.1mm-20mm. Specifically, this overlap can be 0.1mm, 0.2mm, 0.5mm, 7mm, 10mm, 15mm, or 20mm. If the overlap is too small, the protective frame is prone to detachment, leading to insulation failure at the casing welding lines and posing a risk to battery insulation safety. If the overlap is too large, the metal top cover of the battery cannot dissipate heat quickly, causing heat to accumulate in the battery cells and potentially leading to thermal runaway.

[0030] In order to achieve better connection between the insulating coating 210 extending to the battery cover 120 and the insulating coating 210 at the welding line, the insulating coating 210 extends to the battery cover 120, and the protective frame 220 overlaps with the insulating coating disposed on the battery cover 120.

[0031] Specifically, the protective frame 220 has an L-shaped cross-section, forming an annular ring around the power battery. The two ends of the protective frame 220 overlap with the insulating coating 210 of the battery cover 120 and the battery housing 110, respectively, to achieve full coverage of the weld seam and prevent the insulating coating 210 at the weld seam between the battery cover 120 and the battery housing 110 from falling off.

[0032] This solution also includes an insulating top plate 230, which is disposed on the upper surface of the protective frame 220 to further limit the protective frame 220 and prevent the connection between the protective frame 220 and the insulating coating 210 from failing and falling off.

[0033] Specifically, the insulating top plate 230 is glued to the upper surface of the protective frame 220.

[0034] In a specific embodiment, the battery casing 110 is rectangular in shape, with an open top surface on which a battery cover 120 is mounted. The other five surfaces of the battery casing 110 are coated areas, and an insulating coating 210 is provided in the coated areas.

[0035] For the aforementioned rectangular battery casing 110, there are no blank areas for spraying on the outer surface of the battery casing 110. Especially at the edges, after the battery cover plate 120 is welded to the top surface of the battery casing 110, the four sides and bottom surface of the battery casing 110 are fully sprayed.

[0036] In a specific embodiment, such as Figure 1 and Figure 3 As shown, the battery housing 110 has an opening at one end and an internal cavity for accommodating the battery cell assembly. The battery cover 120 has electrode mounting holes for mounting the two electrode terminals of the battery cell assembly, and an explosion-proof valve 130 is provided on the battery cover 120. After being connected to the battery cell assembly, the battery cover 120 is attached to the open end of the battery housing 110.

[0037] Correspondingly, the insulating top plate 230 has electrode clearance holes at positions corresponding to the electrode mounting holes of the battery cover 120, allowing the electrode terminals to extend easily. Simultaneously, the insulating top plate 230 has explosion-proof valve clearance holes at positions corresponding to the explosion-proof valve 130 of the battery cover 120, thus exposing the explosion-proof valve 130.

[0038] Since the insulating top plate 230 may have assembly deviations during installation, based on the above specific embodiment, an insulating coating 210, a protective frame 220, and an insulating top plate 230 can be sequentially provided on the battery housing 110. By installing the insulating top plate 230 on the upper surface of the protective frame 220, that is, pressing the insulating top plate 230 on top of the protective frame 220, and connecting the two ends of the protective frame 220 to the battery cover 120 and the insulating coating 210 of the battery housing 110 respectively, the problem of increased product assembly difficulty caused by the assembly deviation and misalignment of the insulating top plate 230 is solved.

[0039] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0040] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0042] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A power battery, characterized in that, The battery housing includes a battery casing (110) and a battery cover plate (120) connected to the open end of the battery casing (110). The battery cover plate (120) and the battery casing (110) are welded together to form a connection position. An insulating coating (210) is provided on the outer surface of the battery casing (110), and the insulating coating (210) provided on the battery casing (110) extends to the connection position. It also includes a protective frame (220) that covers the outer surface of the insulating coating (210) on the connection position and overlaps with a portion of the insulating coating (210) of the battery housing (110). The protective frame (220) extends from the connection position to the upper surface of the battery cover (120).

2. The power battery according to claim 1, characterized in that, Along the direction perpendicular to the end face of the battery cover (120), the size of the protective frame (220) is 0.2mm-25mm.

3. The power battery according to claim 2, characterized in that, The overlap dimension of the insulating coating (210) on the protective frame (220) and the battery casing (110) is 0.3mm-20mm.

4. The power battery according to claim 1, characterized in that, Along the extending direction of the insulating coating (210), the overlap between the protective frame (220) and the battery cover (120) is 0.1mm-20mm.

5. The power battery according to claim 1, characterized in that, The insulating coating (210) extends onto the battery cover (120), and the protective frame (220) overlaps with the insulating coating (210) disposed on the battery cover (120).

6. The power battery according to any one of claims 1-5, characterized in that, It also includes an insulating top plate (230), which is disposed on the upper surface of the protective frame (220).

7. The power battery according to claim 6, characterized in that, The insulating top plate (230) and the protective frame (220) are bonded together.

8. The power battery according to claim 6, characterized in that, The battery cover (120) is provided with electrode mounting holes for mounting two electrode terminals of the battery cell assembly; And / or, an explosion-proof valve (130) is provided on the battery cover (120).

9. The power battery according to claim 8, characterized in that, The insulating top plate (230) has electrode clearance holes at corresponding positions to the battery cover plate (120).

10. The power battery according to claim 1, characterized in that, The battery casing (110) is rectangular in shape. The top surface of the battery casing (110) is an open end, and the other five surfaces are coating areas. The insulating coating (210) is provided in the coating areas.

11. The power battery according to claim 1, characterized in that, The thickness of the protective frame (220) is 1.5mm-2.5mm, and / or the total length of the protective frame (220) is 2mm-30mm.