Fuse and battery pack

Abstract

The utility model provides a fuse and a battery pack, and the fuse comprises an electric conductor and a housing. The inner cavity of the shell is filled with an arc extinguishing medium; the two ends of the conductor penetrate through the shell and are in sealed connection with the shell, and the part, located in the inner cavity, of the conductor is provided with a fusing structure. According to the fuse provided by the utility model, the shell is arranged to cover and seal the fusing structure of the conductor, so that the fusing structure can be isolated from the outside of the shell, and the normal work of the fusing structure can be ensured when the fuse is used in oil; after the shell is filled with the arc extinguishing medium, arc extinguishing can be rapidly carried out when the fusing structure is fused to generate an electric arc, and electrical equipment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, and particularly relates to a fuse. The utility model also relates to a battery pack having the above-mentioned fuse. Background Art

[0002] With the continuous improvement of new energy technology, the output power and charging power of battery packs are constantly increasing. For battery packs, better heat dissipation of the internal battery cells is required. Currently, for battery packs, there are mainly forms such as air cooling, liquid cooling, and direct cooling to cool the battery packs. However, some battery packs are in harsh working conditions and have higher requirements for the short-time output capacity improvement of the battery. Using traditional battery pack cooling forms will not be able to meet the requirements of cooling and heat dissipation of the battery cells. Therefore, a method of using oil cooling to cool the battery cells of the battery pack has emerged.

[0003] The high-voltage control circuit of the battery pack includes a relay, a current sensor, a pre-charge resistor, a fuse, etc. Among them, the relay, current sensor, pre-charge resistor, etc. can all work in the oil. However, due to its special structural form, when the oil enters the fuse, it will affect the breaking capacity of the fuse, resulting in the fuse being unable to be used in the oil environment. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide a fuse so that the fuse can be used in an oil environment.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A fuse includes a conductor and a housing;

[0007] The inner cavity of the housing is filled with an arc extinguishing medium; both ends of the conductor penetrate the housing and are hermetically connected to the housing, and a fusing structure is provided on the part of the conductor located in the inner cavity.

[0008] Further, the housing includes a main body part and two sealing parts;

[0009] Both ends of the main body part are open, and the two sealing parts are respectively hermetically connected to the two open ends of the main body part, and the conductor penetrates the sealing part.

[0010] Further, a sealing ring is provided between the conductor and the sealing part.

[0011] Further, the fuse includes a limiting member, and the limiting member is sleeved on the conductor and fastened on the sealing part to form a common extrusion of the sealing part on the sealing ring.

[0012] Further, a connection ring is formed by the convexity on the side of the sealing part facing away from the main body part, and the sealing ring is assembled within the connection ring; the limiting member has a pressing end, and the pressing end is inserted into the connection ring and presses the sealing ring.

[0013] Further, a plurality of limiting parts are provided on the outer peripheral wall of the limiting member, and each of the limiting parts abuts against the outer peripheral wall of the connection ring to limit the connection ring.

[0014] Further, a clamping block is provided on the sealing part, and a clamping hole is provided on the limiting member. After the clamping block is inserted into the clamping hole, the limiting member is in a fastened state and presses the sealing ring.

[0015] Further, a structural groove is recessed and formed on the outer peripheral wall of the sealing ring.

[0016] Further, shoulders are respectively provided on the middle part of the conductor and face towards the two sealing parts; the two sealing parts abut against the shoulders to limit and clamp the conductor.

[0017] Further, a hem is provided on the sealing part facing the main body part, and the hem is fixedly connected to the outer side wall of the main body part.

[0018] Further, the fusing structure includes a plurality of mutually separated sheet bodies, and a plurality of structural holes are provided on the sheet bodies to form a narrow-diameter structure of the sheet bodies.

[0019] Compared with the prior art, the present utility model has the following advantages:

[0020] For the fuse according to the present utility model, by arranging a housing to cover and seal the fusing structure of the conductor, the fusing structure can be isolated from the outside of the housing, so that the normal operation of the fusing structure can be ensured even when the fuse is used in oil; after the arc extinguishing medium is filled in the housing, when an arc is generated due to the fusing of the fusing structure, the arc can be quickly extinguished to protect the electrical equipment.

[0021] Secondly, by setting the outer shell in the form of a splicing of a main body part and a sealing part, the fuse can be more easily installed. By arranging a sealing ring, the sealing performance between the conductor and the sealing part can be improved, and external oil is not likely to enter the housing. The limiting member and the sealing part jointly squeeze the sealing ring, which can improve the sealing performance between the conductor and the sealing part. By arranging a connection ring, the sealing ring is assembled in the connection ring, and the pressing end of the limiting member presses the sealing ring, which can increase the contact area between the sealing ring and the conductor and enhance the sealing performance. The limiting parts can abut against the connection ring, making the limiting member not prone to shaking after installation. The arrangement of the clamping block and the clamping hole can realize the fastening of the limiting member, and the installation is convenient and simple.

[0022] Furthermore, providing a structural groove on the sealing ring can reduce the contact area with the sealing portion, improving the sealing effect. Providing a shoulder on the conductor can limit the position when the two sealing portions jointly clamp the conductor. Providing a hem on the sealing portion can facilitate the connection and assembly of the sealing portion and the main body portion. Setting the fusing structure as a plurality of separated sheet bodies and providing structural holes on the sheet bodies can endow the fusing structure with better breaking ability.

[0023] Another object of the present invention is to provide a battery pack, which is provided with the fuse as described above.

[0024] For the battery pack of the present invention, by providing the fuse as described above, the fuse can be arranged in the oil without affecting its use. Furthermore, all high-voltage circuit control electrical components can be placed in the oil for heat dissipation, and small-size selection can be carried out, which is beneficial to reducing the production cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 is a schematic structural view of the fuse according to Embodiment 1 of the present invention;

[0027] Figure 2 is a top view of the fuse according to Embodiment 1 of the present invention;

[0028] Figure 3 is Figure 2 a cross-sectional view taken along the A-A direction in

[0029] Figure 4 is Figure 3 a partial enlarged view of part B in

[0030] Figure 5 is a schematic structural view of the sealing portion according to Embodiment 1 of the present invention;

[0031] Figure 6 is a schematic structural view of the limiting member according to Embodiment 1 of the present invention;

[0032] Figure 7 is a schematic structural view of the sealing ring according to Embodiment 1 of the present invention;

[0033] Figure 8 is a schematic structural view of the conductor according to Embodiment 1 of the present invention.

[0034] Description of the reference numerals:

[0035] 1. Conductor;

[0036] 101. Fusing structure; 1011. Sheet body; 1012. Structural hole; 102. Shoulder

[0037] 2. Housing

[0038] 201. Main body part; 202. Sealing part; 2021. Connecting ring; 2022. Clamping block; 2023. Flanging; 2024. Receiving groove

[0039] 3. Sealing ring

[0040] 301. Structural groove

[0041] 4. Limiting part

[0042] 401. Pressing end; 402. Limiting portion; 403. Clamping hole; 404. Flange Detailed implementation manner

[0043] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other

[0044] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance

[0045] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connecting member" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with the specific circumstances

[0046] The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments

[0047] Embodiment 1

[0048] This embodiment relates to a fuse, so that the fuse can be used in a circuit in an oil environment

[0049] In terms of the overall structure, a fuse according to this embodiment includes a conductor and a housing.

[0050] The inner cavity of the housing is filled with an arc extinguishing medium. Both ends of the conductor penetrate through the housing and are hermetically connected to the housing. The part of the conductor located in the inner cavity is provided with a fusing structure.

[0051] With the above settings, for the fuse of this embodiment, by arranging the housing to cover and seal the fusing structure of the conductor, the fusing structure can be isolated from the external environment of the housing, so that the fuse can ensure the normal operation of the fusing structure when used in oil, without affecting the breaking function of the fuse. After the fusing structure fuses, there is a potential difference between the two ends. Under the action of the potential difference, a high-temperature and high-pressure arc will be generated. After the inner cavity of the housing is filled with an arc extinguishing medium, when the fusing structure fuses to generate an arc, the arc can be quickly extinguished to protect electrical equipment.

[0052] Based on the above overall introduction, referring to Figures 1 to 3 As shown, specifically, both ends of the conductor 1 are used to access the circuit to form a closed loop. The two ends of the conductor 1 passing through the housing 2 can facilitate the electrical connection. The conductor 1 of this application is in a "one" shape, and the two ends of solid metal and the fusing structure 101 in the middle are connected by welding, so that the fusing position of the fuse is controlled at the fusing structure 101. The oil environment where the fuse is located is usually an insulating oil environment, and the specific components can be mineral oil, silicone oil, natural ester, hydrofluoroether, etc. It not only needs to have good insulation ability, but also needs to be non-flammable and have a relatively high flash point.

[0053] Among them, the housing 2 includes a main body part 201 and two sealing parts 202. The two ends of the main body part 201 are open, and the two sealing parts 202 are respectively hermetically connected to the two open ends of the main body part 201, and the conductor 1 penetrates through the sealing part 202. Setting the housing 2 as a structure in which the main body part 201 and the two sealing parts 202 are connected can facilitate the installation of the conductor 1 into the housing 2. For the specific structure of the main body part 201, in this embodiment, the main body part 201 is in a circular tube shape, and the two sealing parts 202 are adapted to the shape of the main body part 201 and cover the two open ends of the main body part 201. Of course, the main body part 201 can also be in the form of a square tube or other tubes. Correspondingly, only the sealing part 202 needs to be in a shape that can be adapted and connected, and the specific shape can be selected according to actual needs.

[0054] During specific installation, the sealing part 202 and the conductor 1 can be first connected in place, and then the main body part 201 and the sealing part 202 are connected. The connection method between the main body part 201 and the sealing part 202 can be bonding or welding with glue, and it is necessary to ensure the sealing relationship between the main body part 201 and the sealing part 202, so that the external oil does not enter the housing 2 from the joint of the sealing part 202 and the main body part 201. In this embodiment, the sealing part 202 is bonded to the main body part 201.

[0055] Specifically, a hem 2023 is provided on the sealing part 202 facing the main body part 201, and the hem 2023 is fixedly connected to the outer side wall of the main body part 201. With such a setting, when the sealing part 202 and the main body part 201 are assembled, the main body part 201 can be inserted into the sealing part 202, and the hem 2023 of the sealing part 202 will be placed on the outer peripheral wall of the main body part 201, which is convenient for the connection operation between the sealing part 202 and the main body part 201.

[0056] For the specific sealing connection form between the conductor 1 and the sealing part 202, refer to Figure 3 and Figure 4 As shown, a sealing ring 3 is provided between the conductor 1 and the sealing part 202 in this embodiment. The sealing ring 3 is made of an elastic material and can fill the gap between the conductor 1 and the sealing part 202. The inner ring of the sealing ring 3 is in interference fit with the conductor 1, so that the sealing ring 3 is tightly connected to the conductor 1 without gaps. The outer ring of the sealing ring 3 abuts against the sealing part 202 to achieve sealing at the outer ring. The material of the sealing ring 3 needs to be selected according to the external oil fluid to prevent the sealing ring 3 from being corroded or deteriorated by the oil fluid in the external environment and ensure the normal sealing function of the sealing ring 3.

[0057] Based on the purpose of improving the sealing effect of the sealing ring 3, refer to Figure 1 and Figure 4 As shown, the fuse of this embodiment includes a limiting member 4. The limiting member 4 is sleeved on the conductor 1 and fastened to the sealing part 202 to jointly squeeze the sealing ring 3 with the sealing part 202. The limiting member 4 is sleeved on the conductor 1, and the limiting member 4 can be pressed against the sealing ring 3 by sliding, which is relatively convenient for installation. After the limiting member 4 is fastened to the sealing part 202, the sealing ring 3 can be pressed tightly. In this way, not only can the sealing ring 3 not be easily displaced during the use of the fuse, but also after the sealing ring 3 is squeezed, it will deform, and the deformed part will increase the pressure of the sealing ring 3 on the conductor 1 and the sealing part 202, making the contact between the sealing ring 3 and the conductor 1 and the sealing part 202 closer and not easily causing gaps for the oil fluid to enter.

[0058] As a further optimization of the structure of the sealing part 202, refer to Figures 3 to 5As shown, on the side facing away from the main body portion 201 of the sealing portion 202 of this embodiment, a connecting ring 2021 is formed in a convex shape, and the sealing ring 3 is assembled within the connecting ring 2021. The limiting member 4 has a pressing end 401, and the pressing end 401 is inserted into the connecting ring 2021 and presses the sealing ring 3. The connecting ring 2021 itself has a cavity, and due to one end being open, it forms a groove-like structure. The conductor 1 passes through the bottom of the groove-like structure, and an annular space for accommodating the sealing ring 3 is formed between the inner wall of the connecting ring 2021. The shape of the pressing end 401 of the limiting member 4 is adapted to the shape of the annular space formed between the conductor 1 and the connecting ring 2021, so that the pressing end 401 of the limiting member 4 can be inserted into the annular space to squeeze the sealing ring 3. After the sealing ring 3 is jointly squeezed by the pressing end 401 of the limiting member 4 and the sealing portion 202, it will deform and press against the sealing portion 202 and the conductor 1, achieving an improvement in the sealing effect.

[0059] Among them, referring to Figure 4 and Figure 6 As shown, the self-shape of the connecting ring 2021 is a rectangular tube, with one end integrally formed with the sealing portion 202 and the other end extending to form an opening, providing an installation space for the sealing ring 3 and the limiting member 4. It should be noted that the specific cross-sectional shape of the connecting ring 2021 can also be circular or other shapes, mainly determined according to the cross-sectional shape of the conductor 1, with the aim of making the materials of each part of the sealing ring 3 uniform and being conducive to improving the sealing effect.

[0060] In order to improve the installation stability of the limiting member 4, a plurality of limiting portions 402 are provided on the outer peripheral wall of the limiting member 4 of this embodiment, and each limiting portion 402 abuts against the outer peripheral wall of the connecting ring 2021 to limit the connecting ring 2021. When the limiting member 4 is installed on the sealing portion 202, the limiting portion 402 can play a guiding role in the sliding direction of the limiting member 4, making it convenient for the limiting member 4 to be installed; at the same time, after the limiting member 4 is fastened, the limiting portion 402 contacts the connecting ring 2021, which can play a role in stabilizing the connection between the limiting member 4 and the sealing portion 202, making the installation of the limiting member 4 on the sealing portion 202 more firm.

[0061] Specifically, in this embodiment, one end of the limiting member 4 facing away from the sealing portion 202 is bent outward to be provided with a flange 404, and a limiting portion 402 is formed on the outer edge of the flange 404, and the limiting portion 402 is arranged in parallel with the connecting ring 2021. The flange 404 can play a positioning function when the limiting member 4 is installed on the sealing portion 202, that is, when the connecting ring 2021 abuts against the flange 404, the limiting member 4 is installed in place. The limiting portion 402 is a rectangular plate extending towards the main body portion 201, and another one is provided around each of the four sides of the limiting member 4, respectively abutting against the four circumferential outer walls of the connecting ring 2021, having better stability. It can be understood that the limiting portion 402 can also be other shapes, as long as it can abut against the outer side wall of the connecting ring 2021, and there are no other limiting conditions.

[0062] For the specific fastening form of the limiting member 4 and the sealing portion 202, refer to Figures 4 to 6 As described above, the sealing portion 202 is provided with a clamping block 2022, and the limiting member 4 is provided with a clamping hole 403. When the clamping block 2022 is inserted into the clamping hole 403, the limiting member 4 is in a fastened state and presses the sealing ring 3. In this embodiment, the clamping hole 403 is provided on two opposite limiting portions 402, which can connect the sealing portion 202 well from both sides. The fastening structure of the clamping block 2022 and the clamping hole 403 enables the limiting member 4 to be installed more conveniently when connected to the sealing portion 202. Of course, it is also possible to use a bolt connection or bonding form between the limiting member 4 and the sealing portion 202, which does not affect the use function of the limiting member 4.

[0063] Specifically, the top of the clamping block 2022 is provided with a guiding inclined surface, so that when the limiting portion 402 is inserted into the connecting ring 2021, the guiding inclined surface can lift the limiting portion 402, so that the clamping block 2022 can enter the clamping hole 403 after passing through the limiting portion 402, realizing the quick connection between the limiting member 4 and the connecting ring 2021.

[0064] As an optimization of the structure of the sealing ring 3, refer to Figure 3 、 Figure 4 and Figure 7 As shown, a structural groove 301 is recessed and formed on the outer peripheral wall of the sealing ring 3. After the circumferential side wall of the sealing ring 3 is provided with the structural groove 301, two rectangular edges will be formed. The two edges are provided with a triangular cross-section, which can make the contact points between the sealing ring 3 and the connecting ring 2021 become two circles, realizing the effect of double-layer sealing. In order to improve the sealing effect of the sealing ring 3, glue can also be applied around the sealing ring 3 for further sealing guarantee.

[0065] In order to make the position of the conductor 1 in the housing 2 more firm, refer to Figure 3 、 Figure 4 and Figure 8 , shoulders 102 are respectively provided on the middle part of the conductor 1 facing the two sealing portions 202. The width of the middle part of the conductor 1 is greater than the width of the two ends to form shoulders 102. The two sealing portions 202 abut against the shoulders 102 to constitute the limiting clamping of the conductor 1. The sealing portion 202 is provided with a receiving groove 2024, and the receiving groove 2024 can receive the shoulders 102 of the conductor 1, and the bottom of the groove is used to abut against the shoulders 102. By clamping the conductor 1 by the two sealing portions 202, the conductor 1 can be prevented from being misaligned in the housing 2, and at the same time, it can also play a role in limiting when the main body portion 201 and the sealing portion 202 are connected. The fusing structure 101 is arranged between the two shoulders 102 to ensure that the fusing structure 101 is completely inside the housing 2 and ensure that the function of the fuse is not restricted.

[0066] Specifically, regarding the specific setting form of the fusing structure 101, refer to Figure 3 and Figure 8 As shown, the fusing structure 101 of this embodiment includes a plurality of mutually separated sheet bodies 1011, and a plurality of structural holes 1012 are provided on the sheet bodies 1011 to form a narrow-diameter structure of the sheet bodies 1011. Setting the fusing structure 101 as a plurality of mutually separated sheet bodies 1011 can enhance the fusing ability of the fusing structure 101. Because the smaller the cross-sectional area of the conductor, the greater the resistance, and the correspondingly higher the generated heat, it is easier to fuse the sheet bodies 1011. Similarly, setting round holes on the sheet bodies 1011 is also to reduce the cross-sectional area of the conductor and improve the fusing ability. When the multi-layer sheet body 1011 structure fuses, several short arcs that are easy to extinguish will be formed at the narrow fusing part. The existence of these short arcs helps to cut off the circuit faster, thereby improving the breaking current ability of the fuse.

[0067] In the fuse of this embodiment, by setting parts such as the sealing ring 3 and the limiting part 4, the sealing effect of the housing 2 on the conductor 1 is improved, so that the fusing structure 101 is completely isolated from the external environment of the housing 2. The fuse can be used in an oil environment, increasing the application conditions of the fuse, which is beneficial to the popularization and application of the fuse.

[0068] Embodiment 2

[0069] This embodiment designs a battery pack, and the fuse in the embodiment is provided in the battery pack.

[0070] In the battery pack of this embodiment, by setting the fuse as described above, the fuse can be set in the oil without affecting its use. Also, since electrical components such as relays, current sensors, and pre-charge resistors can be used in an oil environment themselves, all high-voltage circuit control electrical components can be placed in the oil for heat dissipation, improving the thermal management ability of the battery pack. With the improvement of the heat dissipation effect of the electrical components, correspondingly, small-size selection of the electrical components can be carried out, which is beneficial to reducing the production cost of the battery pack.

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fuse, characterized in that, include: Conductors and housings; The inner cavity of the shell is filled with arc extinguishing medium; both ends of the conductor pass through the shell and are sealed with the shell, and the portion of the conductor located in the inner cavity is provided with a fuse structure.

2. The fuse according to claim 1, characterized in that: The housing comprises a main body and two sealing parts; The main body has openings at both ends, the two sealing parts are respectively sealed and connected to the two open ends of the main body, and the conductor passes through the sealing parts.

3. The fuse according to claim 2, characterized in that: A sealing ring is provided between the conductor and the sealing portion.

4. The fuse according to claim 3, characterized in that: The fuse includes a limiting member, which is sleeved on the conductor and fastened to the sealing portion to form a common extrusion of the sealing ring with the sealing portion.

5. The fuse according to claim 4, characterized in that: The sealing portion is protruded on one side away from the main body to form a connecting ring, and the sealing ring is assembled in the connecting ring; the limiting member has a clamping end, and the clamping end is inserted in the connecting ring and clamps the sealing ring.

6. The fuse according to claim 5, characterized in that: The outer peripheral wall of the limiting member is provided with a plurality of limiting portions, each of which abuts against the outer peripheral wall of the connecting ring to limit the connecting ring; and / or, The sealing portion is provided with a clamping block, and the limiting member is provided with a clamping hole. When the clamping block is inserted into the clamping hole, the limiting member is in a tightened state to press the sealing ring.

7. The fuse according to claim 3, characterized in that: The outer peripheral wall of the sealing ring is concavely formed with a structural groove.

8. The fuse according to claim 2, characterized in that: The middle of the conductor is provided with shoulders respectively facing the two sealing parts; the two sealing parts abut against the shoulders to form a limiting clamping of the conductor; and / or, The sealing portion is provided with a folded edge toward the main body portion, and the folded edge is fixedly connected to the outer side wall of the main body portion.

9. The fuse according to any one of claims 1 to 8, characterized in that: The fuse structure includes a plurality of sheets separated from each other, and a plurality of structural holes are arranged on the sheets to form a narrow diameter structure of the sheets.

10. A battery pack, characterized in that: The battery pack is provided with the fuse according to any one of claims 1 to 9.

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