Scald-proof fuse and battery pack using same

Abstract

The utility model relates to an anti-scald fuse and a battery pack using the same, and belongs to the field of storage batteries. Comprising a shell and a metal wire arranged in the shell, supporting structures are arranged on sealing plugs on the shell or at the two ends of the shell, the supporting structures support the shell wall away from an external plane structure, and a constant heat insulation space in the installation state is formed. The supporting structure adopts various structures such as sawteeth, salient points and a ring body, and is mainly used for lifting a heating part of the fuse to be suspended, so that a high-temperature area is not in contact with a battery shell, and a heat insulation gap is formed. The sawtooth structure disclosed by the utility model is beneficial to circumferential flow of air flow in the heat insulation space, so that the heat insulation and heat dissipation effects are further optimized, and the effect of protecting the battery pack shell is achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery protection technology for two-wheeled vehicles, and in particular to an anti-scalding fuse and a battery pack using the fuse. Background Technology

[0002] When using lead-acid batteries, electric two-wheelers typically use multiple lead-acid batteries connected in series. To ensure the safe operation of the vehicle's circuitry, a fuse needs to be connected in series between the batteries. The fuse will quickly melt and break in the event of a short circuit and loss of control, thus protecting the circuitry and preventing the vehicle from burning out.

[0003] In the structure of an electric vehicle, the fuse is connected in series within the battery pack, typically positioned at the top. The battery pack casing is made of ABS material, which has a heat distortion temperature of 80 degrees Celsius. When the vehicle is running, a large current flows through the fuse, causing it to continuously heat up. When the heat reaches a certain level, it can damage the battery pack casing, posing a significant safety hazard. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a reasonably structured anti-scalding fuse and a battery pack using the fuse, which raises the heating part of the fuse to a suspended position so as not to contact the battery pack casing, thereby achieving the purpose of protecting the battery pack casing.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A heat-resistant fuse includes a fuse body and a support structure disposed on the fuse body. The support structure separates the shell wall of the fuse body from the external planar structure to form a constant heat-insulating space in the installed state.

[0007] As a further improvement to the above technical solution:

[0008] The fuse body includes a housing, a metal wire built into the housing, and sealing plugs located at both ends of the housing; a support structure is symmetrically formed on the housing or the sealing plugs.

[0009] The support structure on the outer shell consists of several support points arranged in a circle.

[0010] The sealing plug includes:

[0011] An embedded segment is nested and installed within the end of the housing.

[0012] The top cover is coaxially arranged with the embedded section.

[0013] A support portion is disposed on the top cover, the outer diameter of the support portion being larger than the outer diameter of the outer shell; the support portion is in contact with the external planar structure.

[0014] The support part is in point contact with the external planar structure; the support part adopts any one of saw teeth, protrusions or cone tips, and the support part is circumferentially formed on the circumference of the top cover.

[0015] The support part is in line contact with the external planar structure. The support part adopts a gear tooth or ring body and is coaxially arranged on the outer wall of the top cover.

[0016] The heat deformation temperature of the sealing plug is greater than that of the outer shell.

[0017] The wire is connected in series to the wire harness, with a positive terminal and a negative terminal connected to each end of the wire harness; the wire harness passes through the sealing plug and is connected to the metal wire.

[0018] A battery pack using an anti-scalding fuse includes several batteries connected in series. At least one connection line between adjacent batteries is connected to an anti-scalding fuse, and a heat insulation space is always maintained between the casing of the anti-scalding fuse and the battery casing.

[0019] As a further improvement to the above technical solution:

[0020] The heat-insulating space between the housing of the heat-resistant fuse and the battery housing allows for circumferential airflow.

[0021] The beneficial effects of this utility model are as follows:

[0022] This application features a compact structure, minimal alteration to the original structure, and minimal impact on the overall battery pack, while exhibiting significant heat insulation and anti-scalding effects. The key technical point lies in raising the heating part of the fuse to a suspended position, preventing the high-temperature area from contacting the battery casing and thus protecting the battery casing.

[0023] This application changes the traditional fuse to a dumbbell shape, creating a gap between the fuse housing and the battery pack housing. This gap can effectively reduce the probability of the metal wire overheating and burning the battery pack housing.

[0024] Furthermore, the serrated support of this application can reduce the contact area with the housing, thereby further reducing heat transfer between the housing and the housing.

[0025] Another advantage of the serrated structure is that, compared to a solid plate as a sealing plug top cover structure, the gaps between the serrations allow airflow or heat to pass through. This allows the insulation space to not only provide insulation but also allow airflow carrying heat to pass through the gaps between the serrations, forming a four-way breathable insulation space, which further helps to reduce heat accumulation.

[0026] Because the structure of the sealing plug tends to be circular or polygonal, it may shift as the vehicle moves during driving. This easy-to-roll structure also helps to reduce local heat accumulation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the anti-scalding fuse of this utility model installed on a battery pack.

[0028] Figure 2 This is a schematic diagram of the connection wire with anti-scalding fuse of this utility model.

[0029] Figure 3 This is an exploded view of the anti-scalding fuse of this utility model.

[0030] Figure 4 This is a schematic diagram showing the location of the heat insulation space formed in this utility model.

[0031] Figure 5 This is a schematic diagram of the tooth support structure of this utility model.

[0032] Figure 6 This is a schematic diagram of the ring support structure of this utility model.

[0033] Figure 7 This is a schematic diagram of the sawtooth support structure of this utility model.

[0034] Figure 8 This is a schematic diagram of the cone tip support structure of this utility model.

[0035] Figure 9 This is a schematic diagram of the convex support structure of this utility model.

[0036] The components include: 1. outer casing; 2. metal wire; 3. sealing plug; 4. heat insulation space; 5. wiring harness; 6. battery; and 7. connecting wire.

[0037] 301. Embedded section; 302. Top cover; 303. Support section;

[0038] 501, positive extreme; 502, negative extreme. Detailed Implementation

[0039] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0040] Example 1:

[0041] Existing fuses often generate excessive heat during use, potentially damaging the ABS plastic casing of the battery pack. This application addresses this overheating issue by proposing a fuse that prevents burns to the battery pack casing. Support structures are incorporated at both ends of a conventional fuse, giving the fuse body a dumbbell shape. When this anti-scalding fuse is applied to a lead-acid battery pack, and the fuse body is threaded into the wiring harness 5 between the batteries 6, the fuse body rests on the batteries 6. The fuse casing 1 is lifted by the support structure, creating a heat-insulating space between the casing 1 and the battery pack casing. This reduces the heat transferred to the battery pack casing. When the fuse heats up, the gap prevents direct heat transfer to the battery pack casing, thus protecting the battery pack casing.

[0042] Adjacent batteries 6 are connected by connecting wires 7, with a heat-resistant fuse connected in series on at least one of the connecting wires 7. In this embodiment, a single heat-resistant fuse is sufficient to meet the protection requirements for a battery pack.

[0043] As a further limitation of this embodiment, such as Figure 2 and Figure 3 As shown, a connecting wire 7 with a fuse includes a wire harness 5, a positive terminal 501 and a negative terminal 502 located on both sides of the wire harness 5, and a heat-resistant fuse located in the middle of the wire harness 5.

[0044] Positive terminal 501 and negative terminal 502 are made of copper alloy and their main function is to connect to the 6-terminal of the battery via fixing bolts. Wiring harness 5 serves to connect the battery and transmit current; as a preferred specification, the wire diameter (unit: mm) is... 2 = Maximum current limit for the whole vehicle / 10.

[0045] The outer shell 1 of the anti-scalding fuse is made of transparent PC material, which has high temperature resistance and its heat distortion temperature is generally above 120℃. At the same time, because the outer shell 1 is transparent, when the fuse blows, the fuse status can be seen directly through the outer shell 1.

[0046] Metal wire 2 is made of alloy material, using lead-tin alloy, and its specification (unit: A) = maximum current limit of the whole vehicle / 0.8.

[0047] Example 2:

[0048] As an optimized solution of Embodiment 1, this embodiment sets the support structure at both ends of the outer casing 1. Support points are added to the outer walls at both ends of the outer casing 1. The support points can be subsequently bonded and installed, or they can be protrusions integrally formed during the manufacturing of the outer casing 1. In order to minimize the heat energy transferred to the battery pack casing, the structure of the support points is set as conical, that is, the part closer to the outer casing 1 is larger in size and the end away from the outer casing 1 is smaller in size, so as to achieve the purpose of support while reducing the heat that can be transferred.

[0049] The support points are arranged in a circular array on the outer wall of the outer shell 1, so that even if the outer shell 1 rolls, it will always be supported by the support points to form a heat-insulating space.

[0050] Example 3:

[0051] As an alternative to Embodiment 2, the difference between this embodiment and Embodiment 2 is that the support structure is changed to a support portion 303 provided on the sealing plug 3.

[0052] Each end of the outer casing 1 is provided with a sealing plug 3. Each sealing plug 3 includes an insert section 301 extending into the outer casing 1 and a top cover 302 protruding outside the outer casing 1. The sealing plug 3 is made of BMC material, with a deformation temperature of up to 150°C, which is higher than the deformation temperature of the outer casing 1, thus providing protection. The support part 303 is provided on the outer circumferential surface of the top cover 302.

[0053] When the fuse is placed on the battery, the entire outer casing 1 does not contact the battery pack casing; only the support portion 303 contacts the battery pack casing. The advantage of this arrangement, compared to Embodiment 2, is that less heat is transferred. First, the heat generated by the metal wire 2 is mainly concentrated on the outer casing 1. For the outer casing 1 to transfer heat to the battery pack, it needs to pass through the sealing plug 3. Since the sealing plug 3 is not in direct contact with the metal wire 2, some heat is already isolated in the air during heat transfer. Therefore, the battery pack casing receives less heat than in Embodiment 2 due to the further transfer via the sealing plug 3. Thus, placing the support portion on the sealing plug 3 is the preferred solution.

[0054] Based on Embodiment 2, the following embodiments of this application propose specific shapes for the support structure. The contact between the support structure and the battery pack housing can be surface contact, line contact, or point contact.

[0055] Example 4:

[0056] Surface contact can be achieved by adding sealing plugs 3 to the coplanar surface of the perforated plate on the top cover 302. The perforations and insulation space meet the requirement of circumferential airflow. However, surface contact can conduct the most heat. Therefore, surface contact is a theoretically feasible solution, but its application in practice is unlikely.

[0057] Example 5:

[0058] When there is line contact between the support structure and the battery pack housing, the structures that can be used include gear teeth and rings with chamfered sides.

[0059] like Figure 5As shown, the gear tooth structure is similar to that of a mechanical gear, arranged in a circular array around the outer wall of the top cover 302 of the sealing plug 3. The tip of the gear tooth makes line contact with the battery pack casing, and the heat energy transferred is less than that transferred through surface contact.

[0060] like Figure 6 As shown, the ring structure is a ring-shaped component coaxially fitted onto the top cover 302. The two sides of the ring-shaped component are chamfered, making the outer edge of the ring-shaped component very narrow, so as to achieve line contact with the battery pack housing.

[0061] Example 6:

[0062] When there is point contact between the support structure and the battery pack casing, the structures that can be used include serrations, protrusions, and cone tips.

[0063] like Figure 7 As shown, the serrated structure is mostly produced by one-piece injection molding, resulting in a top cover 302 with multiple serrations. The tips of the serrations can make point contact with the battery pack casing. In Example 5, the tooth tip size is made smaller, which can also be used as a point contact serration.

[0064] like Figure 8 As shown, the cone tip structure is a further improvement on the serrated structure, that is, the tip of the serration is made sharper, but the tip may scratch the battery pack casing, thus posing a safety hazard.

[0065] like Figure 9 As shown, the raised dot structure can be formed on the top cover 302 using methods such as drip molding or one-piece molding. However, the raised dot structure requires higher precision and is more difficult to mold.

[0066] Considering factors such as manufacturing process, cost, and heat transfer efficiency, in practice, the preferred solution is to form serrations around the top cover 302. These serrations act as a support structure, lifting the outer casing 1 and creating a heat-insulating space between it and the battery pack casing. This embodiment provides a set of preferred heat-insulating gap data, such as... Figure 4 As shown, a 2mm gap width can be used. The gap between adjacent serrations allows for circumferential airflow in the insulation space, further optimizing the heat dissipation and insulation effect.

[0067] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A heat-resistant fuse, characterized in that: It includes the fuse body and the support structure provided on the fuse body. The support structure separates the shell wall of the fuse body from the external plane structure to form a constant heat insulation space in the installation state (4).

2. The anti-scalding fuse as described in claim 1, characterized in that: The fuse body includes a housing (1), a metal wire (2) built into the housing (1), and sealing plugs (3) located at both ends of the housing (1); the support structure is symmetrically formed on the housing (1) or the sealing plugs (3).

3. The anti-scalding fuse as described in claim 2, characterized in that: The support structure on the outer shell (1) consists of several circumferentially arranged support points.

4. The anti-scalding fuse as described in claim 2, characterized in that: The sealing plug (3) includes: An embedded section (301) is nested and installed within the end of the outer casing (1). The top cover (302) is coaxially arranged with the embedded section (301). A support part (303) is disposed on the top cover (302), the outer diameter of the support part (303) is larger than the outer diameter of the outer shell (1); the support part (303) is in contact with the external planar structure.

5. The anti-scalding fuse as described in claim 4, characterized in that: The support part (303) is in point contact with the external planar structure; the support part (303) adopts any one of saw teeth, protrusions or cone tips, and the support part (303) is circumferentially formed on the circumference of the top cover (302).

6. The anti-scalding fuse as described in claim 4, characterized in that: The support part (303) is in line contact with the external planar structure. The support part (303) adopts a gear tooth or ring body. The support part (303) is coaxially arranged on the outer wall of the top cover (302).

7. The anti-scalding fuse as described in claim 2, characterized in that: The heat deformation temperature of the sealing plug (3) is greater than that of the outer shell (1).

8. The anti-scalding fuse as described in claim 2, characterized in that: The wire harness (5) is connected in series with a positive terminal (501) and a negative terminal (502) at both ends; the wire harness (5) passes through the sealing plug (3) and is connected to the metal wire (2).

9. A battery pack, employing the anti-scalding fuse as described in claim 2, characterized in that: It includes several batteries (6) connected in series. At least one connecting wire (7) between adjacent batteries (6) is connected to an anti-heat fuse. The heat insulation space (4) is always left between the outer shell (1) of the anti-heat fuse and the battery shell.

10. The battery pack as claimed in claim 9, characterized in that: The heat insulation space (4) between the outer casing (1) of the heat-resistant fuse and the battery casing allows airflow to circumferentially.

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