Battery box, maintenance switch and its plug

Abstract

The present invention relates to a battery box, a maintenance switch and its plug. The plug of the maintenance switch includes a main housing having a receiving cavity; a fuse element disposed in the receiving cavity; a plug contact member having a connection end connected to the fuse element and a plug end for connecting with a mating contact member; a sealing plate connected to the main housing, which is provided with an opening for the plug end of the plug contact member to extend out; a heat-conducting adhesive is filled between the cavity wall of the receiving cavity and the fuse element to transfer the heat of the fuse element to the main housing. The fuse element is the main heating element in the plug. By filling the heat-conducting adhesive between the fuse element and the cavity wall of the receiving cavity, the heat-conducting adhesive can timely transfer the heat generated by the fuse element itself and at the connection between the fuse element and the plug contact member to the main housing, and then use the main housing to exchange heat with the external environment, thereby avoiding the ablation and aging problems caused by heat accumulation when the fuse element conducts a large current, and improving the service life of the plug.

Description

Technical Field

[0001] The present invention relates to a battery box, a maintenance switch and its plug. Background Art

[0002] Currently, the voltage used in electric vehicles is generally high voltage not less than 300V. To avoid electric shock hazards caused by improper operation and damage to electrical components due to overload and short circuit, a manual maintenance switch needs to be installed on the main trunk line of the large current in the vehicle circuit. The manual maintenance switch plays a role in protecting the power supply in the electric vehicle circuit. In case of an emergency or when performing battery maintenance installation, the operator can timely disconnect the manual maintenance switch to cut off the current of the battery box. Considering the development trend of electric vehicle power sources towards miniaturization and high energy density, it is therefore required that power-related accessories such as maintenance switches develop towards compactness, convenience, and miniaturization.

[0003] The patent document with the authorization announcement number CN110223896B and the authorization announcement date of April 7, 2020 discloses a manual maintenance switch, which mainly includes a plug and a base. Among them, the plug includes an upper cover and a protective cover. The upper cover is a rectangular box body, which houses a fuse and a female terminal assembly electrically connected to the fuse. The protective cover is connected to the upper cover to press the fuse tightly in the upper cover. A sealing ring is embedded on the side of the upper cover facing the base. The base in the manual maintenance switch includes a base housing. A sealing gasket is arranged on the side of the base housing facing the plug. A male terminal assembly is also fixedly arranged in the base housing. When the plug is connected to the base, the male terminal assembly in the base can be inserted into the female terminal assembly of the plug to achieve electrical conduction between the plug and the base.

[0004] This kind of maintenance switch has a compact structure and occupies a small space, and can well meet the usage requirements of electric vehicle power sources. However, technicians have found that if this kind of maintenance switch often conducts large current during use, the maintenance switch will have problems such as aging or terminal ablation in a very short service life cycle, and cannot normally play the role of fuse protection, and needs to be replaced timely and frequently, resulting in an increase in the usage cost of the battery box. Summary of the Invention

[0005] The purpose of the present invention is to provide a plug of a maintenance switch to solve the problems that the existing maintenance switch ages, ablates and has a short service life when conducting large current;

[0006] Another purpose of the present invention is to provide a maintenance switch to solve the problems that the existing maintenance switch often ages, ablates and has a short service life;

[0007] Another object of the present invention is to provide a battery box to solve the problem that the service life of the maintenance switch of the existing battery box is short and it often needs to be replaced, resulting in high usage costs.

[0008] To achieve the above object, the following technical solution is adopted for the plug of the maintenance switch in the present invention:

[0009] The plug of the maintenance switch includes:

[0010] A main housing having a receiving cavity;

[0011] A fusing element disposed in the receiving cavity;

[0012] A plug contact having a connection end connected to the fusing element and a plug end for connecting to a mating contact;

[0013] A sealing plate connected to the main housing and provided with an opening through which the plug end of the plug contact extends;

[0014] Thermal conductive glue is filled between the cavity wall of the receiving cavity and the fusing element to transfer the heat of the fusing element to the main housing.

[0015] The beneficial effect is that when the fusing element conducts a large current in the plug, the fusing element itself and the contact position between the fusing element and the contact are severely heated, making the fusing element the main heating element in the plug. Thermal conductive glue is filled between the fusing element and the cavity wall of the receiving cavity, and the thermal conductive glue can timely transfer the heat generated by the fusing element itself and the connection between the fusing element and the plug contact to the main housing, and then use the main housing to exchange heat with the external environment, thus avoiding the ablation and aging problems caused by heat accumulation when the fusing element conducts a large current, and improving the service life of the plug.

[0016] Further, a glue injection port is provided on the main housing and / or the sealing plate for the thermal conductive glue to be injected between the fusing element and the cavity wall of the receiving cavity.

[0017] The beneficial effect is that by providing a glue injection port on the main housing and / or the sealing plate, the operator can inject the thermal conductive glue through the glue injection port after the components of the plug are assembled, that is, first assembly and then glue injection. The whole process is easy to control the glue injection amount, the operation is relatively simple, and the efficiency is relatively high.

[0018] Further, an observation window for observing the glue injection situation is provided on the main housing and / or the sealing plate.

[0019] The beneficial effect is that by providing an observation window, the operator can observe the position and shape of the thermal conductive glue during the glue injection process, more easily control the glue injection quality, and at the same time is beneficial to reducing the number of defective products caused by glue injection defects and improving the yield rate.

[0020] Furthermore, an observation window and a glue injection port are arranged on the sealing plate.

[0021] The beneficial effect is that the observation window and the glue injection port are both arranged on the sealing plate, so that the operator can inject glue from the sealing plate during glue injection and observe the thermal conductive glue from the sealing plate, which is convenient for operation.

[0022] Furthermore, heat dissipation ribs for increasing the heat exchange area of the main shell are arranged on the outer surface of the main shell.

[0023] The beneficial effect is that heat dissipation ribs are arranged on the main shell, which can increase the heat exchange area of the main shell, thereby improving the heat exchange efficiency of the main shell, so that the main shell can dissipate the heat transferred by the thermal conductive adhesive more quickly, thereby improving the heat dissipation capacity of the entire plug and avoiding the occurrence of problems such as ablation and aging caused by heat accumulation at the fuse.

[0024] Furthermore, the main shell is a rectangular box body with an opening on one side, the sealing plate is sealingly installed at the opening of the main shell body, and the heat dissipation ribs are arranged on each side of the rectangular box body.

[0025] Its beneficial effects are: the main shell is designed as a rectangular box with an opening on one side, which can form a closed space with the sealing plate to facilitate glue injection; at the same time, it can also increase the filling amount of thermal conductive glue, thereby improving the heat dissipation efficiency of the plug, and allowing the heat generated by the fuse itself and the connection between the fuse and the plug contact to be transferred to the outside in a timely manner.

[0026] Furthermore, a plurality of heat dissipation ribs are arranged on two opposite sides of the rectangular box body in the width direction. The plurality of heat dissipation ribs are spaced and arranged in parallel in the height direction of the rectangular box body and extend along the length direction of the rectangular box body.

[0027] Its beneficial effect is that the heat dissipation ribs on the two opposite sides in the width direction of the rectangular box body are designed to be arranged at intervals in the height direction and extend in the length direction, which can not only increase the heat exchange area of the main shell, but also form an operating part for people to hold to drive the plug to be plugged in and out, reducing the arrangement of the redundant structure of the main shell and making the main shell structure simpler.

[0028] Furthermore, the plug contact and the fuse are crimped and connected by the wiring bolts connected to the main shell, and the main shell and the sealing plate are fixedly connected by the plug bolts tightened on the main shell; the wiring bolts are connected at both ends of the main shell in the length direction, and the plug bolts are connected at both ends of the main shell in the width direction.

[0029] The beneficial effect is that the connection bolts and plug bolts are arranged in a dispersed manner, which can avoid the dense structure of concentrated screw holes in the main shell that affects heat dissipation, and can transfer heat to the outside through the thermal conductive adhesive in time, avoiding the burning and aging of the fuse and plug contact in a short time.

[0030] To achieve the above object, the maintenance switch in the present invention adopts the following technical solution:

[0031] The maintenance switch includes a plug and a base adapted to the plug;

[0032] The plug includes:

[0033] A main housing having a receiving cavity;

[0034] A fusing element disposed in the receiving cavity;

[0035] A plug contact having a connection end connected to the fusing element and a plug-in end for connecting to an adapted contact;

[0036] A sealing plate connected to the main housing and provided with an opening for the plug-in end of the plug contact to extend out;

[0037] Thermal conductive glue is filled between the cavity wall of the receiving cavity and the fusing element to transfer the heat of the fusing element to the main housing.

[0038] The beneficial effect is that when the fusing element conducts a large current in the plug, the fusing element itself and the contact position between the fusing element and the contact are severely heated, making the fusing element the main heating element in the plug. Thermal conductive glue is filled between the fusing element and the cavity wall of the receiving cavity, and the thermal conductive glue can timely transfer the heat generated by the fusing element itself and the connection part between the fusing element and the plug contact to the main housing, and then use the main housing to exchange heat with the external environment, thus avoiding the ablation and aging problems caused by heat accumulation when the fusing element conducts a large current, and improving the service life of the plug.

[0039] Further, a glue injection port is provided on the main housing and / or the sealing plate for the thermal conductive glue to be injected between the fusing element and the cavity wall of the receiving cavity.

[0040] The beneficial effect is that by providing a glue injection port on the main housing and / or the sealing plate, after the components of the plug are assembled, the operator can inject the thermal conductive glue through the glue injection port, that is, first assemble and then inject glue. The whole process is easy to control the amount of glue injection, the operation is relatively simple, and the efficiency is relatively high.

[0041] Further, an observation window for observing the glue injection situation is provided on the main housing and / or the sealing plate.

[0042] The beneficial effect is that by providing an observation window, the operator can observe the position and shape of the thermal conductive glue during the glue injection process, more easily control the glue injection quality, and at the same time is beneficial to reducing the number of defective products caused by glue injection defects and improving the yield rate.

[0043] Further, the observation window and the glue injection port are provided on the sealing plate.

[0044] Its beneficial effects are as follows: By arranging the observation window and the glue injection port on the sealing plate, operators can inject glue from the sealing plate and observe the thermal conductive glue from the sealing plate during glue injection, which is relatively convenient for operation.

[0045] Furthermore, heat dissipation ribs for increasing the heat exchange area of the main housing are arranged on the outer surface of the main housing.

[0046] Its beneficial effects are as follows: By arranging heat dissipation ribs on the main housing, the heat dissipation ribs can increase the heat exchange area of the main housing, thereby improving the heat exchange efficiency of the main housing, enabling the main housing to dissipate the heat transferred by the thermal conductive glue more quickly, thus enhancing the heat dissipation capacity of the entire plug and avoiding problems such as ablation and aging caused by heat accumulation at the fuse element.

[0047] Furthermore, the main housing is a rectangular box body with an opening on one side, the sealing plate is hermetically installed at the opening of the main housing, and the heat dissipation ribs are arranged on each side surface of the rectangular box body.

[0048] Its beneficial effects are as follows: Designing the main housing as a rectangular box body with an opening on one side can form a closed space with the sealing plate, facilitating glue injection; at the same time, it can also increase the filling amount of the thermal conductive glue, thereby improving the heat dissipation efficiency of the plug and enabling the heat generated by the fuse element itself and the connection between the fuse element and the plug contact to be transferred outward in a timely manner.

[0049] Furthermore, there are multiple heat dissipation ribs arranged on the two opposite side surfaces in the width direction of the rectangular box body. The multiple heat dissipation ribs are arranged in parallel at intervals in the height direction of the rectangular box body and extend along the length direction of the rectangular box body.

[0050] Its beneficial effects are as follows: Designing the heat dissipation ribs on the two opposite side surfaces in the width direction of the rectangular box body to be arranged at intervals in the height direction and extend in the length direction can not only increase the heat exchange area of the main housing but also form an operation part for people to hold to drive the plug to be inserted and removed, reducing the layout of redundant structures of the main housing and making the structure of the main housing simpler.

[0051] Furthermore, the plug contact and the fuse element are electrically connected by crimping with wiring bolts connected to the main housing, and the main housing and the sealing plate are fixedly connected by plug bolts screwed onto the main housing; the wiring bolts are connected to both ends in the length direction of the main housing, and the plug bolts are connected to both ends in the width direction of the main housing.

[0052] Its beneficial effects are as follows: By dispersedly arranging the wiring bolts and the plug bolts, it can avoid the dense structure where screw holes are concentratedly arranged in the main housing, which affects heat dissipation, enabling heat to be transferred outward through the thermal conductive glue in a timely manner and preventing the fuse element and the plug contact from being ablated and aged in a short time.

[0053] To achieve the above object, the battery box in the present invention adopts the following technical solution:

[0054] The battery box includes a box body, in which battery cells, a circuit conducting with the battery cells, and a maintenance switch connected to the circuit are arranged. The maintenance switch includes a plug and a base; the plug includes:

[0055] A main housing having a receiving cavity;

[0056] A fusing element arranged in the receiving cavity;

[0057] A plug contact having a connection end connected to the fusing element and a plug-in end for connecting to a mating contact;

[0058] A sealing plate connected to the main housing, on which an opening is provided for the plug-in end of the plug contact to extend out;

[0059] Thermal conductive glue is filled between the cavity wall of the receiving cavity and the fusing element to transfer the heat of the fusing element to the main housing.

[0060] Its beneficial effect is that when the fusing element conducts a large current in the plug, the fusing element itself and the contact position between the fusing element and the contact are severely heated, making the fusing element the main heating element in the plug. Thermal conductive glue is filled between the fusing element and the cavity wall of the receiving cavity. The thermal conductive glue can timely transfer the heat generated by the fusing element itself and the connection between the fusing element and the plug contact to the main housing, and then use the main housing to exchange heat with the external environment, thus avoiding the ablation and aging problems caused by heat accumulation when the fusing element conducts a large current, improving the service life of the plug, increasing the overall service time of the battery box, and being able to avoid the problem of high use cost of the battery box caused by frequent replacement of the maintenance switch.

[0061] Further, a glue injection port is provided on the main housing and / or the sealing plate for the thermal conductive glue to be injected between the fusing element and the cavity wall of the receiving cavity.

[0062] Its beneficial effect is that by providing a glue injection port on the main housing and / or the sealing plate, the operator can inject the thermal conductive glue through the glue injection port after the components of the plug are assembled, that is, first assembly and then glue injection are realized. The whole process is easy to control the glue injection amount, the operation is relatively simple, and the efficiency is relatively high.

[0063] Further, an observation window for observing the glue injection situation is provided on the main housing and / or the sealing plate.

[0064] Its beneficial effect is that by providing an observation window, the operator can observe the position and shape of the thermal conductive glue during the glue injection process, more easily control the glue injection quality, and at the same time is beneficial to reducing the number of defective products caused by glue injection defects and improving the yield rate.

[0065] Furthermore, an observation window and a glue injection port are arranged on the sealing plate.

[0066] The beneficial effect is that the observation window and the glue injection port are both arranged on the sealing plate, so that the operator can inject glue from the sealing plate during glue injection and observe the thermal conductive glue from the sealing plate, which is convenient for operation.

[0067] Furthermore, heat dissipation ribs for increasing the heat exchange area of the main shell are arranged on the outer surface of the main shell.

[0068] The beneficial effect is that heat dissipation ribs are arranged on the main shell, which can increase the heat exchange area of the main shell, thereby improving the heat exchange efficiency of the main shell, so that the main shell can dissipate the heat transferred by the thermal conductive adhesive more quickly, thereby improving the heat dissipation capacity of the entire plug and avoiding the occurrence of problems such as ablation and aging caused by heat accumulation at the fuse.

[0069] Furthermore, the main shell is a rectangular box body with an opening on one side, the sealing plate is sealingly installed at the opening of the main shell body, and the heat dissipation ribs are arranged on each side of the rectangular box body.

[0070] Its beneficial effects are: the main shell is designed as a rectangular box with an opening on one side, which can form a closed space with the sealing plate to facilitate glue injection; at the same time, it can also increase the filling amount of thermal conductive glue, thereby improving the heat dissipation efficiency of the plug, and allowing the heat generated by the fuse itself and the connection between the fuse and the plug contact to be transferred to the outside in a timely manner.

[0071] Furthermore, a plurality of heat dissipation ribs are arranged on two opposite sides of the rectangular box body in the width direction. The plurality of heat dissipation ribs are spaced and arranged in parallel in the height direction of the rectangular box body and extend along the length direction of the rectangular box body.

[0072] Its beneficial effect is that the heat dissipation ribs on the two opposite sides in the width direction of the rectangular box body are designed to be arranged at intervals in the height direction and extend in the length direction, which can not only increase the heat exchange area of the main shell, but also form an operating part for people to hold to drive the plug to be plugged in and out, reducing the arrangement of the redundant structure of the main shell and making the main shell structure simpler.

[0073] Furthermore, the plug contact and the fuse are crimped and connected by the wiring bolts connected to the main shell, and the main shell and the sealing plate are fixedly connected by the plug bolts tightened on the main shell; the wiring bolts are connected at both ends of the main shell in the length direction, and the plug bolts are connected at both ends of the main shell in the width direction.

[0074] The beneficial effect is that the connection bolts and plug bolts are arranged in a dispersed manner, which can avoid the dense structure of concentrated screw holes in the main shell that affects heat dissipation, and can transfer heat to the outside through the thermal conductive adhesive in time, avoiding the burning and aging of the fuse and plug contact in a short time. Brief Description of the Drawings

[0075] Figure 1 It is a schematic diagram of the appearance of Embodiment 1 of the maintenance switch in the present invention;

[0076] Figure 2 is Figure 1 a schematic diagram of the structure of each component of the maintenance switch in;

[0077] Figure 3 is Figure 1 a schematic diagram of the structure of the bottom of the plug in;

[0078] Figure 4 is Figure 1 a schematic diagram of the structure of each component of the plug in;

[0079] Figure 5 is Figure 2 a schematic diagram of the structure of the main housing in;

[0080] Figure 6 is Figure 1 a schematic diagram of the structure of the maintenance switch without the main housing installed;

[0081] Figure 7 is Figure 2 a schematic diagram of the structure of the sealing plate in;

[0082] Figure 8 It is a schematic diagram when the plug contact and the base contact of the maintenance switch in Embodiment 1 of the present invention are plugged together;

[0083] Figure 9 is Figure 1 a schematic diagram of the structure of each component of the base in;

[0084] Figure 10 It is a schematic diagram showing the bottom of the display plug in another embodiment of the maintenance switch of the present invention;

[0085] Figure 11 is Figure 10 a three-dimensional exploded view of the plug shown;

[0086] Figure 12 is Figure 11 a schematic diagram of the structure of the sealing plate in;

[0087] In the figure:

[0088] 10 - Plug; 11 - Main housing; 111 - First hollow cylinder; 112 - Second hollow cylinder; 113 - Through hole;

[0089] 114 - Accommodation cavity; 115 - Installation groove; 116 - Top surface rib; 117 - Vertical rib; 118 - Horizontal rib; 12 - Fuse;

[0090] 13 - Plug contact; 14 - Sealing plate; 141 - Large opening; 142 - Small opening; 143 - Rectangular groove; 144 - Contact mounting groove; 149 - Small round hole;

[0091] 145 - Through hole; 146 - Avoidance hole; 15 - Wiring bolt; 16 - Plug bolt; 17 - Sealing ring; 18 - First screw sleeve;

[0092] 19 - Second screw sleeve; 20 - Base; 21 - Base housing; 211 - First jack; 212 - Second jack; 22 - Base contact;

[0093] 23 - Cover plate; 24 - Sealing gasket; 25 - Base screw sleeve; 26 - Base bolt; 30 - Connecting bolt. Detailed implementation manners

[0094] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0095] Therefore, the detailed description of the embodiments of the present invention provided in the drawings below is not intended to limit the scope of the claimed present invention, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0096] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non - exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0097] The features and performances of the present invention will be further described in detail below in conjunction with the embodiments.

[0098] Embodiment 1 of the maintenance switch in the present invention: The maintenance switch is installed on the casing of the battery box. In case of emergency or when maintenance and installation of the battery box are required, the operator can manually disconnect the maintenance switch, thereby disconnecting the current in the battery box. As Figure 1 shown, the maintenance switch mainly includes two parts, namely a base 20 fixed to the casing of the battery box, and a plug 10 detachably connected to the base 20. Contact members are provided in both the base 20 and the plug 10. When the plug 10 is connected to the base 20, the corresponding contact members can conduct the circuit.

[0099] As Figure 2 , Figure 3 and Figure 4 shown, the plug 10 of the maintenance switch includes a main housing 11 as the outer shell part and a sealing plate 14. The sealing plate 14 is connected to the opening of the main housing 11. A fuse 12 as a fusing element is arranged in the space enclosed by the main housing 11 and the sealing plate 14, and plug contact members 13 are arranged at both ends in the length direction of the fuse 12.

[0100] As Figure 6 shown, the fuse 12 includes a fuse main body and fuse connection terminals arranged at both ends of the fuse main body. The connection ends of the plug contact members 13 are conductively connected to the connection terminals of the fuse 12. Thus, when the maintenance switch is in use, current passes through the fuse 12 between the two plug contact members 13. When a short-circuit current passes through the fuse 12, the fuse 12 will cut off the circuit to ensure electrical safety. When the fuse 12 is in use, there will be a problem that if a large current is conducted for a long time, the fuse 12 will be ablated and aged due to heat accumulation. Therefore, to avoid ablation and aging of the fuse 12 and the entire plug 10 due to heat accumulation, and to ensure that the fuse 12 can normally play the role of fusing protection, a thermal conductive adhesive is filled in the plug 10 of the present invention at the position of the fuse 12, which can quickly transfer the heat to the main housing 11, and then use the main housing 11 to exchange heat with the external environment.

[0101] Specifically, as Figure 5As shown, the shape of the main housing 11 is a rectangular box. An accommodation cavity 114 for accommodating a fuse 12 is preset in the rectangular box, and a hollow cylinder extending along the insertion direction is also arranged. The hollow cylinder includes a first hollow cylinder 111 and a second hollow cylinder 112. The radial dimension of the first hollow cylinder 111 is larger than that of the second hollow cylinder 112. The first hollow cylinder 111 is located at both ends of the main housing 11 in the length direction, and a first screw sleeve 18 is inserted therein. A tooth shape is provided on the outer peripheral surface of the first screw sleeve 18 to be relatively fixed to the first hollow cylinder 111 when inserted into the first hollow cylinder 111. The second hollow cylinder 112 is located at both ends of the main housing 11 in the width direction, and there are four of them. Two arranged at intervals in the width direction are a pair. A second screw sleeve 19 is inserted into the second hollow cylinder 112. A tooth shape is provided on the outer peripheral surface of the second screw sleeve 19 to be relatively fixed to the second hollow cylinder 112 when inserted into the second hollow cylinder 112.

[0102] Among them, a connection bolt 15 is configured in the plug 10. The connection bolt 15 corresponds to the first hollow cylinder 111. Avoidance openings for avoiding the connection bolt 15 are provided on both the plug contact 13 and the connection terminal of the fuse 12. Thus, when the connection bolt 15 is connected to the first screw sleeve 18 in the first hollow cylinder 111, the plug contact 13 is pressed against the connection terminal of the fuse 12, and the fuse 12 is also pressed against the main housing 11 by the connection bolt 15.

[0103] At the edge position of the main housing 11, six through holes 113 are provided, through which corresponding connection bolts 30 can pass, so that the connection bolts 30 are screwed with the base 20, thereby realizing the detachable connection between the main housing 11 and the base 20. An installation groove 115 is provided inside the closed curve surrounded by the six through holes 113. A sealing ring 17 is embedded in the installation groove 115. When the plug 10 is connected to the base 20, the sealing ring 17 can be deformed by being pressed, thereby ensuring the sealing performance of the connection.

[0104] Such as Figure 7 、 Figure 8 and Figure 9As shown in the figure, a rectangular groove 143 corresponding to the fuse body is provided on the sealing plate 14. When the sealing plate 14 is connected to the main housing 11, the lower half of the fuse body can sink into the rectangular groove 143 on the sealing plate 14. At both ends of the sealing plate 14 in the length direction, avoidance holes 146 for avoiding the bolt heads in the connection bolts 15 are provided. Between the two avoidance holes 146, a contact element installation groove 144 for installing the plug contact element 13 is also provided. The bottom of the contact element installation groove 144 is a large opening 141 for the insertion end of the plug contact element to extend out, so that when the plug is matched with the base, the plug contact element 13 can extend into the base 20 and be inserted and matched with the contact element in the base 20. At the edge position of the sealing plate 14, a through hole 146 corresponding to the position of the second hollow column 112 is provided for the plug bolt 16 to pass through. After the plug bolt 16 passes through the through hole 146, it is screwed with the second screw sleeve 19 in the second hollow column 112, thereby realizing the connection between the sealing plate 14 and the main housing 11.

[0105] Between the fuse body and the cavity wall of the accommodating cavity, heat-conducting glue for transferring the heat of the fuse body to the main housing is filled. The heat-conducting glue has a high heat conductivity and can timely transfer the heat at the fuse 12 to the main housing 11, thereby dissipating the heat of the fuse 12 and avoiding the occurrence of ablation and aging problems. A glue injection port and an observation window are provided on the sealing plate 14. The glue injection port allows the operator to inject the heat-conducting glue between the fuse body and the cavity wall of the accommodating cavity. When the operator performs the glue injection operation, the flow, curing and distribution of the heat-conducting glue in the main housing can be observed through the observation window. In combination with the structure of the sealing plate 14, at the bottom of the rectangular groove 143, four small openings 142 penetrating both sides of the bottom are provided. Some of the small openings 142 can be used as observation windows, and some of the small openings 142 are used as glue injection ports.

[0106] In other embodiments, the observation window can be provided on the main housing, the glue injection port can be provided on the sealing plate, or the observation window can be provided on the sealing plate and the glue injection port can be provided on the main housing. Or, as Figures 10 - 12 shown in another embodiment of the maintenance switch, four rectangular small openings 142 are arranged in a matrix at the middle position on the sealing plate 14. All four small openings 142 are used as observation windows. Small round holes 149 are also opened near the four corners of the sealing plate 14. The small round holes 149 are used as glue injection ports and can inject glue into the space surrounded by the sealing plate 14 and the main housing 11 relatively evenly.

[0107] It should be noted that when injecting the thermal conductive adhesive, the thermal conductive adhesive is in a fluid state. The operator injects the thermal conductive adhesive in batches, injecting a small amount of thermal conductive adhesive each time. After the thermal conductive adhesive cures, the thermal conductive adhesive is injected again, and this cycle continues until the injection operation is completed. The purpose of doing this is to control the amount of injected adhesive each time, so as to better control the position where the thermal conductive adhesive is distributed, and avoid the thermal conductive adhesive overflowing into the plug contact 13 during injection, which may affect the normal plugging and matching between the plug contact and the contact in the base. When filling the thermal conductive adhesive, when it is seen from the observation window that the thermal conductive adhesive is flush with or slightly covers the fuse, the injection of the thermal conductive adhesive can be stopped to avoid excessive injection of the thermal conductive adhesive and causing it to enter the plug contact.

[0108] Since the thermal conductive adhesive can transfer the heat generated by the fuse 12 during operation to the main housing 11, heat dissipation ribs are also correspondingly arranged on the main housing 11. Specifically, heat dissipation ribs are arranged on each side surface of the main housing 11. Among them, a plurality of closed-loop top surface ribs 116 are provided on the top surface, and sunken depressions are formed between the closed loops, thereby increasing the heat exchange area between the top surface of the main housing 11 and the air.

[0109] A plurality of vertical ribs 117 extending in the up and down direction are arranged on the two side surfaces of the main housing 11 opposite to each other in the length direction. Sunken depressions are formed between the vertical ribs 117, thereby increasing the heat exchange area between the side surface of the main housing 11 and the air and improving the heat dissipation efficiency.

[0110] A plurality of transverse ribs 118 extending in the length direction are arranged on the two side surfaces of the main housing 11 opposite to each other in the width direction. There are intervals between the transverse ribs. They are arranged side by side at intervals in the height direction of the main housing 11. At this time, the transverse ribs 118 can not only increase the heat exchange area of the main housing 11, but also form an operating part, enabling the operator to drive the plugging and unplugging of the plug and the base by holding the transverse ribs 118. In other embodiments, the transverse ribs can be arranged on the two side surfaces of the main housing opposite to each other in the length direction, and the vertical ribs can be arranged on the two side surfaces of the main housing opposite to each other in the width direction.

[0111] The base 20 includes a base housing 21. On the side of the base housing 21 facing the plug, a sealing gasket 24 is arranged, and a cover plate 23 is pressed on the sealing gasket 24. In the base housing 21, a base contact 22 is provided. The plugging end of the base contact 22 connected to the plug contact 13 is exposed from the base 20 and can achieve plugging and matching with the plug contact 13 when the plug 10 is connected to the base 20.

[0112] On the base housing 21, there are two types of jacks with different radial dimensions, namely the first jack 211 and the second jack 212. Inside both the first jack 211 and the second jack 212, there is a base screw sleeve 25. The outer peripheral surface of the base screw sleeve 25 has teeth and is relatively fixed to the two types of jacks after being inserted into the first jack 211 and the second jack 212. Among them, the position of the first jack 211 corresponds to the middle through hole 113 of the main housing 11 and is used for screwing with the connecting bolt 30 to realize the detachable connection between the plug 10 and the base 20. The second jack 212 is adapted to the base bolt 26 inside the base 20. The base bolt 26 is used to press the cover plate 23 against the gasket 24, and through holes for the connecting bolt 30 and the base bolt 26 to pass through are correspondingly provided on the cover plate 23.

[0113] The fuse element, as the main heating element in the plug, has thermal conductive glue filled between the fuse element and the cavity wall of the accommodating cavity. The thermal conductive glue can timely transfer the heat generated by the fuse element itself and at the connection between the fuse element and the plug contact to the main housing, and then utilize the heat exchange between the main housing and the external environment, thus avoiding the ablation and aging problems caused by heat accumulation when the fuse element conducts large current and improving the service life of the plug.

[0114] Certainly, the maintenance switch in the present invention is not limited to the technical solutions provided in the above embodiments, and the technical solutions provided in the following embodiments can also be adopted.

[0115] In Embodiment 2 of the maintenance switch in the present invention, the difference from the above embodiment is that in this embodiment, the plug of the maintenance switch includes a main housing in the shape of a rectangular box body. The main housing has an accommodating cavity for the fuse element. During assembly, the technician first injects the thermal conductive glue into the accommodating cavity of the main housing, and then fixes the fuse element on the main housing, and subsequently installs components such as contacts into the main housing. After the thermal conductive glue cures, it is located between the cavity wall of the accommodating cavity and the fuse element and can transfer the heat of the fuse element to the main housing. In this embodiment, the operation mode of injecting glue first and then assembling is adopted, and no glue injection port is provided on the main housing or the sealing plate. Although it is different from the method of assembling each component first and then injecting glue and the structures of the main housing and the sealing plate in Embodiment 1, it can also achieve the function of timely dissipating the heat of the fuse element.

[0116] In Embodiment 3 of the maintenance switch in the present invention, the difference from the above embodiment is that in this embodiment, an opening is provided on the sealing plate, and the opening is blocked with transparent glass or transparent acrylic material to make the observation window a closed structure, which is different from the solution in Embodiment 1 that uses the opening on the sealing plate as the observation window. In other embodiments, no observation window is provided on the main housing and / or the sealing plate. The operator needs to pre-calculate the amount of glue injection each time, and then quantitatively inject the thermal conductive glue, and strictly control the amount of glue injection to ensure the quality without observing the glue injection process.

[0117] Embodiment 4 of the maintenance switch in the present invention is different from the above embodiments in that in this embodiment, a fan can be installed above the main housing to increase the air circulation speed to carry away more heat, improve the heat exchange speed between the main housing and the external environment, and timely discharge the heat accumulated at the fuse element by increasing the temperature difference between the main housing and the fuse element, avoiding problems such as ablation and aging of the maintenance switch. Therefore, it is not limited to the solution of setting heat dissipation ribs on the main housing.

[0118] Embodiment 5 of the maintenance switch in the present invention is different from the above embodiments in that in this embodiment, the main housing of the plug is a square tube structure with openings at both ends. The fuse element and the plug contact are fixed in the inner cavity of the square tube structure. One end of the square tube structure faces the socket, and the opening at this end can also make the insertion end of the plug contact extend out to be inserted and matched with the mating contact in the base. The opening at the other end of the square tube structure can be sealed by injecting heat-conducting glue and relying on the curing of the heat-conducting glue. At this time, the inner cylindrical surface of the square tube structure and the fuse element are filled with heat-conducting glue, which can transfer heat to the square tube structure, and heat dissipation ribs are arranged on the outer peripheral surface of the square tube structure, which can accelerate the heat exchange speed between the square tube structure and the external environment. Therefore, it is not limited to using a rectangular box body with only one side open as the main housing.

[0119] Embodiment 6 of the maintenance switch in the present invention is different from the above embodiments in that in this embodiment, elastic claws are provided on the side of the sealing plate facing the main housing, and a card slot adapted to the elastic claws is provided at the corresponding position of the main housing. The sealing plate can be relatively fixed to the main housing by the engagement of the elastic claws and the card slot. At this time, only the wiring bolts need to be arranged in the main housing, and there is no need to arrange holes for the bolts to pass through to connect the main housing and the sealing plate.

[0120] Embodiment of the plug of the maintenance switch in the present invention: The structure of the plug of the maintenance switch in the present invention is the same as the structure of the plug in the above maintenance switch embodiments. Therefore, the embodiments of the plug of the maintenance switch will not be repeated.

[0121] Embodiment of the battery box in the present invention: The battery box is generally installed in an electric vehicle to supply power to the motor of the electric vehicle as a power source. The battery box includes a box body, in which battery cells, circuits electrically connected to the battery cells, and a maintenance switch connected to the circuit are arranged. These structures are the same as those of other existing battery boxes. The difference is that in the present invention, heat-conducting glue is provided in the plug of the maintenance switch, and the structure of the plug of the maintenance switch is the same as the structure of the plug in the above maintenance switch embodiments. Therefore, the embodiments of the battery box will not be repeated.

[0122] The specific embodiments described above further elaborate on the object of the invention, the technical solutions and the beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Repair switch plug, including: A main housing having a receiving cavity; A fuse is arranged in the accommodating cavity; A plug contact having a connection end connected to the fuse and a plug end for connecting to the matching contact; A sealing plate connected to the main housing, and provided with an opening for the plug end of the plug contact to extend out; It is characterized in that Thermally conductive glue is filled between the cavity wall of the accommodating cavity and the fuse to transfer the heat of the fuse to the main shell; the plug contact and the fuse are crimped and connected through the wiring bolts connected to the main shell, and the main shell and the sealing plate are fixedly connected by the plug bolts screwed on the main shell; the wiring bolts are connected at both ends of the main shell in the length direction, and the plug bolts are connected at both ends of the main shell in the width direction, and the wiring terminals of the plug contact and the fuse are provided with avoidance holes for avoiding the wiring bolts; the main shell and / or the sealing plate are provided with glue injection ports and observation windows, and the glue is injected in batches until the thermally conductive glue and the fuse are seen from the observation window to be flush with or slightly cover the fuse, and the glue injection is stopped.

2. The plug of the maintenance switch according to claim 1, characterized in that, The outer surface of the main shell is provided with heat dissipation ribs for increasing the heat exchange area of the main shell.

3. The plug of the maintenance switch according to claim 2, characterized in that, The main shell is a rectangular box body with an opening on one side. The sealing plate is sealed and installed at the opening of the main shell body. The heat dissipation ribs are arranged on each side of the rectangular box body.

4. The plug of the maintenance switch according to claim 3, characterized in that, A plurality of heat dissipation ribs are arranged on two opposite sides of the rectangular box body in the width direction. The plurality of heat dissipation ribs are spaced and arranged in parallel in the height direction of the rectangular box body and extend along the length direction of the rectangular box body.

5. Maintenance switch, including a plug and a base adapted to the plug, characterized in that, The plug is a plug of a maintenance switch according to any one of claims 1 to 4.

6. Battery box, comprising a box body, in which battery cells, a circuit electrically connected to the battery cells, and a maintenance switch connected to the circuit are arranged. The maintenance switch comprises a plug and a base, and is characterized in that, The plug is a plug of a maintenance switch according to any one of claims 1 to 4.

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