A switch structure for a charging gun, the charging gun and a charging device

Abstract

The application discloses a switch structure for a charging gun, a charging gun and a charging device, which comprise a terminal fixing device, at least one charging terminal, at least one adapter terminal, at least one power supply terminal and a push rod; the terminal fixing device is axially provided with at least two cavities; the charging terminal is at least partially arranged in the cavities; one end of the adapter terminal is electrically connected with the charging terminal, and the other end is provided with a first contact point; one end of the power supply terminal is provided with a second contact point, and the other end is electrically connected with a cable of the charging gun; the push rod is at least partially arranged in the cavities and is translated in the axial direction in the cavities; the push rod is arranged to control the adapter terminal to be translated in the axial direction, so that the first contact point is in contact with or separated from the second contact point. According to the switch structure for the charging gun, when the charging gun does not charge a new energy automobile, the charging terminal of the charging gun is not electrified, and electric shock of personnel is prevented.

Description

Technical Field

[0001] This invention relates to the field of charging equipment technology for new energy vehicles, and more specifically, to a switch structure for a charging gun, a charging gun, and a charging device. Background Technology

[0002] With the introduction of national energy conservation and emission reduction policies and the continuous advancement of science and technology, new energy electric vehicles have become widespread. Therefore, safety is the most important factor for charging guns used to charge new energy vehicles. Currently, charging guns are generally set to high current and high power, making electrical safety particularly important for users and manufacturers. How to improve the switching structure for charging guns so that the charging gun head is not energized in the non-working state, and even if the charging terminal of the charging gun head is accidentally touched, it will not cause electric shock, while also being waterproof, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0003] The purpose of this invention is to provide a new technical solution for a switch structure for a charging gun. According to a first aspect of the invention, a switch structure for a charging gun is provided, comprising a terminal fixing device, wherein the terminal fixing device has at least two cavities axially disposed;

[0004] At least one charging terminal, said charging terminal being at least partially disposed within the cavity;

[0005] At least one adapter terminal, one end of which is electrically connected to the charging terminal, and the other end of which is provided with a first contact;

[0006] At least one power terminal, one end of which is provided with a second contact and the other end is electrically connected to the cable of the charging gun;

[0007] A push rod, at least partially disposed within the cavity and arranged axially within the cavity;

[0008] The push rod is configured to control the adapter terminal to translate along the axial direction, so that the first contact and the second contact come into contact or separate.

[0009] Optionally, the contact resistance after the first contact and the second contact come into contact is less than 9mΩ.

[0010] Optionally, the switch structure further includes a telescopic member, one end of which is connected to the charging terminal and the other end of which is connected to the adapter terminal.

[0011] Optionally, the telescopic member is configured as a tension spring-shaped conductive wire, which applies a force away from the power supply terminal to the adapter terminal.

[0012] Optionally, the telescopic member is configured as a relative sliding device, which includes a fixed part and a sliding part. The fixed part is disposed at one end of the charging terminal adjacent to the adapter terminal, and the sliding part is disposed at one end of the adapter terminal adjacent to the charging terminal. The sliding part slides relative to the fixed part and is in contact with it.

[0013] Optionally, the contact resistance after the fixed part comes into contact with the sliding part is less than 9mΩ.

[0014] Optionally, the switch structure further includes a reset element configured to provide a force to the adapter terminal away from the power supply terminal, thereby causing the first contact to separate from the second contact.

[0015] Optionally, the spring constant of the reset member is from 0.6 N / mm to 7.4 N / mm.

[0016] Optionally, the reset element is a compression elastic element, which is insulatedly connected between the adapter terminal and the power terminal.

[0017] Optionally, the reset element is a tensile elastic element, which is insulated and fixedly connected between the adapter terminal and the terminal fixing device, and / or the tensile elastic element is constructed as a tensile spring-shaped wire, one end of which is connected to the charging terminal and the other end of which is connected to the adapter terminal.

[0018] Optionally, the terminal fixing device is further provided with a sealing cover on the side near the adapter terminal. The sealing cover is fixed to the terminal fixing device and is sealed to the terminal fixing device. A first through hole is provided on the sealing cover at a position corresponding to the charging terminal. A sealing ring is provided in the first through hole, and the sealing ring seals the charging terminal with the side wall of the first through hole.

[0019] Optionally, a second through hole is provided on the sealing cover at a position corresponding to the push rod, and a sealing sleeve is also provided for sealing the second through hole, the central part of the sealing sleeve moving with the push rod.

[0020] Optionally, the switch structure further includes a push bracket slidably connected to the sealing cover. The push bracket is used to install the adapter terminal. The push rod pushes the sealing sleeve, causing the push bracket to translate axially. The push bracket is provided with at least one first fixing part, and each first fixing part abuts against the side surface of the adapter terminal opposite to the first contact.

[0021] Optionally, the adapter terminal includes a charging terminal connector and a power terminal connector, which are bent and connected in an L-shape. The charging terminal connector is electrically connected to the corresponding charging terminal, and the power terminal connector has a first contact on the side facing the power terminal. The first contact is opposite to the second contact.

[0022] Optionally, the power terminal connector is elastic, and when the first contact contacts the second contact, the pressure applied by the power terminal connector to the second contact is 5N-95N.

[0023] Optionally, the switch structure further includes a power terminal fixing device, the power terminal fixing device having at least one second fixing part, each of the second fixing parts abutting against the surface of the power terminal opposite to the second contact.

[0024] Optionally, the power terminal includes an adapter terminal connector and a cable connector, which are bent and connected in an L-shape. The adapter terminal connector has a second contact on the side facing the adapter terminal, and the second contact is opposite to the first contact. The cable connector is connected to the cable of the charging gun through a channel provided on the power terminal fixing device.

[0025] Optionally, the adapter terminal connector is elastic, and when the first contact and the second contact are in contact, the pressure applied by the adapter terminal connector to the first contact is 5N-95N.

[0026] Optionally, the power terminal is further provided with an elastic piece, one end of which is connected to the end of the adapter terminal connector, and the other end abuts against the second fixing part.

[0027] Optionally, the charging terminal includes a positive terminal and a negative terminal, and the positive terminal and the negative terminal are electrically connected to the corresponding adapter terminal through the telescopic member.

[0028] Optionally, the charging terminal includes a signal line terminal and a PE line terminal; the signal line terminal and the PE line terminal are electrically connected to the corresponding adapter terminal through the telescopic member.

[0029] Optionally, the shortest distance between the first contact and the second contact is less than or equal to the distance by which the push rod moves the adapter terminal.

[0030] According to a second aspect of the present invention, a charging gun is provided, comprising a switch structure for the charging gun as described above and a housing, wherein the terminal fixing device, the power terminal fixing device and the cable are fixed within the housing.

[0031] According to a third aspect of the present invention, a charging device is provided, characterized in that it includes a charging gun as described above and a charging socket that mates with the charging gun, wherein a push rod is provided in the charging socket, and when the charging gun mates with the charging socket, the push rod abuts against the push rod and pushes the push rod to translate axially, thereby causing the first contact point to contact the second contact point.

[0032] According to the switch structure for a charging gun disclosed herein, the following effects are achieved:

[0033] 1. The present invention provides a switch structure for a charging gun, which ensures that the charging terminal of the charging gun is not energized when the charging gun head is not charging a new energy vehicle, thereby preventing electric shock to personnel.

[0034] 2. In the prior art, the charging gun uses a circuit board to control the charging terminal of the charging gun to be de-energized. With the switching structure for the charging gun of the present invention, there is no need to use a circuit board, thus reducing production costs.

[0035] 3. The switch structure for a charging gun of the present invention prevents water from entering the charging gun when there is a small amount of water at the end of the charging gun, thus preventing water from affecting the normal use of the charging gun and avoiding short circuits, personal injury, and fire accidents caused by water accumulation.

[0036] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0038] Figure 1 This is an exploded view of the switch structure for a charging gun according to the present invention;

[0039] Figure 2 This is a schematic diagram of the adapter terminal and power terminal in this invention;

[0040] Figure 3 This is a perspective view of the switch structure for a charging gun according to the present invention;

[0041] Figure 4 This is a side view of the switch structure for a charging gun according to the present invention;

[0042] Figure 5This is a schematic diagram of the sealing sleeve of the present invention;

[0043] Figure 6 This is a longitudinal cross-sectional view of the sealing sleeve of the present invention;

[0044] The diagram is marked as follows:

[0045] 100 - Terminal fixing device; 101 - Charging terminal; 102 - Adapter terminal; 103 - Second through hole; 104 - Power terminal; 105 - First contact; 106 - Second contact; 107 - Push rod; 108 - Fixing part; 109 - Sliding part; 110 - Reset part; 111 - Sealing cover; 112 - First through hole; 113 - Sealing sleeve; 114 - Sealing sleeve clamping ring; 115 - Cylinder; 116 - Annular sealing ring; 117 - Sealing extension part; 118 - Push bracket; 119 - First fixing part; 120 - Charging terminal connector; 121 - Power terminal connector; 122 - Power terminal fixing device; 123 - Second fixing part; 124 - Adapter terminal connector; 125 - Cable connector; 126 - Sliding limit part; 127 - Sliding groove; 128 - Elastic sheet. Detailed Implementation

[0046] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0047] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0048] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0049] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0050] This disclosure provides a switch structure for a charging gun, such as... Figures 1 to 6 As shown, including,

[0051] Terminal fixing device 100, wherein the terminal fixing device 100 is provided with at least two cavities in the axial direction;

[0052] At least one charging terminal 101 is at least partially disposed within the cavity;

[0053] At least one adapter terminal 102, one end of which is electrically connected to the charging terminal 101, and the other end is provided with a first contact 105;

[0054] At least one power terminal 104, one end of which is provided with a second contact 106, and the other end is electrically connected to the cable of the charging gun;

[0055] A push rod 107 is at least partially disposed within the cavity and translates axially within the cavity.

[0056] The push rod 107 is configured to control the adapter terminal 102 to translate along the axial direction, so that the first contact 105 and the second contact 106 come into contact or separate.

[0057] In specific implementation, such as Figure 1 , Figure 3 , Figure 4 As shown, by separating the adapter terminal 102 from the power terminal 104, it can be ensured that the charging terminal side is not energized when not in operation, which can prevent electric shock and avoid injury or death. At the same time, in the prior art, the charging gun uses a circuit board to control the charging terminal 101 to be de-energized. With the switch structure for the charging gun of the present invention, there is no need to use a circuit board, which reduces production costs. Furthermore, by setting the push rod 107, when the charging gun is charging a new energy vehicle, the push rod 107 can be pushed towards the power terminal 104 so that the first contact 105 and the second contact 106 can make contact and achieve electrical conduction. During the process of the charging gun separating from the new energy vehicle, the push rod 107 is driven to move away from the power terminal 104. The push rod 107 drives the adapter terminal 102 to move so that the first contact 105 and the second contact 106 can separate. This ensures that the charging terminal 101 of the charging gun is not energized after the charging gun is separated from the new energy vehicle. Through the mechanical structure, the charging terminal 101 is not energized when it is not working. Compared with using a circuit board to control the charging terminal 101 to be de-energized, it saves costs and is more practical.

[0058] In practical applications, the axially arranged cavities of the terminal fixing device 100 are all cavities with openings at both ends. At least a portion of each charging terminal 101 passes through the corresponding cavity, and the end of the charging terminal 101 near the adapter terminal 102 protrudes from the side of the terminal fixing device 100 near the adapter terminal 102.

[0059] The present invention discloses a switch structure for a charging gun, wherein the contact resistance between the first contact 105 and the second contact 106 is less than 9mΩ.

[0060] Under normal circumstances, a large current needs to be conducted. If the contact resistance between the first contact 105 and the second contact 106 is greater than 9mΩ, a large temperature rise will occur at the contact point, and the temperature will continue to rise over time. Due to the temperature rise, the mechanical deformation of the adapter terminal 102 and the power terminal 104 will be asynchronous, generating internal stress. In severe cases, this can cause a loose connection between the first contact 105 and the second contact 106, or the first contact 105 and the second contact 106 may melt and become inseparable, making it impossible to achieve the desired contact or separation between the first contact 105 and the second contact 106. Furthermore, a loose connection could damage the power supply of the new energy vehicle, or the inability to separate could cause the charging terminal 101 to become energized, potentially causing injury or death due to contact issues. Therefore, the inventors have set the contact resistance after the first contact 105 and the second contact 106 make contact to be less than 9mΩ.

[0061] To verify the effect of the contact resistance between the first contact 105 and the second contact 106 on their temperature rise and conductivity, the inventors selected the same first contact 105 and a second contact 106 with different contact resistances, and conducted tests on conductivity and temperature rise.

[0062] The conductivity test involves bringing the first contact 105 and the second contact 106 into contact, applying current, and then measuring the conductivity at the corresponding contact point. In this embodiment, a conductivity greater than 99% is considered an ideal value.

[0063] The temperature rise test involves applying the same current to the connection structure formed by the first contact 105 and the second contact 106 in a closed environment, and measuring the temperature at the same location of the second contact 106 before and after the temperature stabilizes, then taking the absolute value of the difference. In this embodiment, a temperature rise greater than 50K is considered unacceptable.

[0064] Table 1 shows the effect of different contact resistances between the first and second contacts on conductivity and temperature rise.

[0065]

[0066] As shown in Table 1, when the contact resistance between the first contact 105 and the second contact 106 is greater than 9 mΩ, the temperature rise at the contact point exceeds 50 K. Simultaneously, the conductivity at the contact point is less than 99%, which does not meet the standard requirements. Therefore, the inventors set the contact resistance after the first contact 105 and the second contact 106 make contact to be less than 9 mΩ.

[0067] The present invention discloses a switch structure for a charging gun, the switch structure further comprising a telescopic member, one end of which is connected to the charging terminal 101 and the other end of which is connected to the adapter terminal 102.

[0068] Furthermore, the telescopic member is constructed as a tension spring-shaped conductive wire, which applies a force away from the power supply terminal 104 to the adapter terminal 102.

[0069] Furthermore, the telescopic member is constructed as a relative sliding device, which includes a fixed part 108 and a sliding part 109. The fixed part 108 is disposed at one end of the charging terminal 101 adjacent to the adapter terminal 102, and the sliding part 109 is disposed at one end of the adapter terminal 102 adjacent to the charging terminal 101. The sliding part 109 slides relative to the fixed part 108 and is in contact with it.

[0070] In specific implementation, by setting up a telescopic component, during the reciprocating motion of the push rod 107, the charging terminal 101 and the adapter terminal 102 are kept together as the adapter terminal 102 moves closer to or further away from the power terminal 104. This ensures that the charging terminal 101 and the adapter terminal 102 are kept together when the first contact 105 and the second contact 106 are in contact, thus ensuring circuit continuity.

[0071] In specific implementation, the telescopic component can be configured as a tension spring-shaped conductive wire, or as a relative sliding device. The relative sliding device includes a fixed part 108 and a sliding part 109. Through the elastic force of the tension spring-shaped conductive wire, the adapter terminal 102 can undergo displacement changes between the adapter terminal 102 and the charging terminal 101 during the movement of the adapter terminal 102 toward the power terminal 104, and the two do not separate to ensure electrical conduction. By setting the relative sliding device, through the sliding and non-separating cooperation between the fixed part 108 and the sliding part 109, it is possible to maintain electrical conduction even when the adapter terminal 102 and the charging terminal 101 undergo displacement changes during the movement of the adapter terminal 102 toward the power terminal 104.

[0072] Furthermore, the contact resistance between the fixed part 108 and the sliding part 109 is less than 9mΩ.

[0073] Under normal circumstances, a large current needs to be conducted. If the contact resistance between the fixed part 108 and the sliding part 109 is greater than 9mΩ, a large temperature rise will occur at the contact point, and the temperature will increase over time. Due to the temperature rise, the mechanical deformation of the fixed part 108 and the sliding part 109 will be asynchronous, generating internal stress. In severe cases, the fixed part 108 and the sliding part 109 may not be able to slide relative to each other, resulting in a loose connection or inability to separate the first contact 105 and the second contact 106. This may prevent the first contact 105 and the second contact 106 from making contact or separation as set, or even damage to the power supply of the new energy vehicle due to a loose connection. Furthermore, the inability to separate the two could cause the charging terminal 101 to become energized, resulting in electric shock injuries or fatalities. Therefore, the inventors have set the contact resistance after the fixed part 108 and the sliding part 109 come into contact to be less than 9mΩ.

[0074] To verify the effect of the contact resistance between the fixed part 108 and the sliding part 109 on their temperature rise and conductivity, the inventors selected the same fixed part 108 and sliding parts 109 with different contact resistances, and conducted tests on conductivity and temperature rise.

[0075] The conductivity test involves contacting the fixed part 108 with the sliding part 109, applying electricity, and then measuring the conductivity at the corresponding connection point. In this embodiment, a conductivity greater than 99% is considered ideal.

[0076] The temperature rise test involves passing the same current through the connection structure formed by the fixed part 108 and the sliding part 109 in a closed environment, measuring the temperature at the same position of the sliding part 109 before and after the temperature stabilizes, and taking the absolute value of the difference. In this embodiment, a temperature rise greater than 50K is considered unacceptable.

[0077] Table 2 shows the effect of different contact resistances between the fixed part 108 and the sliding part 109 on conductivity and temperature rise.

[0078]

[0079] As shown in Table 2, when the contact resistance between the fixed part 108 and the sliding part 109 is greater than 9 mΩ, the temperature rise at the contact point between the fixed part 108 and the sliding part 109 exceeds 50 K. Simultaneously, the conductivity at the contact point between the fixed part 108 and the sliding part 109 is less than 99%, which does not meet the standard requirements. Therefore, the inventors set the contact resistance after the fixed part 108 and the sliding part 109 come into contact to be less than 9 mΩ.

[0080] The present disclosure discloses a switch structure for a charging gun, the switch structure further comprising a reset member 110, the reset member 110 being configured to provide a force to the adapter terminal 102 in a direction away from the power terminal 104, thereby causing the first contact 105 to separate from the second contact 106.

[0081] In specific implementation, by setting a reset component 110, it can be ensured that the first contact 105 and the second contact 106 are separated when the charging gun is not in operation. Without applying external force to the push rod 107, the first contact 105 and the second contact 106 are always in a separated state, so that the charging terminal 101 is not energized, thus avoiding electric shock accidents.

[0082] Furthermore, the elastic modulus of the reset member 110 is from 0.6 N / mm to 7.4 N / mm.

[0083] In practical implementation, the elastic coefficient of the reset component determines whether the reset component can make or break the first contact 105 and the second contact 106 according to the settings. If the elastic coefficient is too large, the charging gun using this switch structure will not be able to cooperate with the charging receiver of the new energy vehicle it is used with, resulting in the inability to charge the new energy vehicle. Or, even if the charging gun using this switch structure can cooperate with the charging receiver of the new energy vehicle, the first contact 105 may not be able to make contact with the second contact 106 due to the excessive elastic coefficient of the reset component 110. If the elastic coefficient is too small, the reset component 110 will not be able to drive the adapter terminal 102 to move, and the separation of the first contact 105 and the second contact 106 will not be achieved. This will cause one end of the charging terminal 101 of the charging gun to become energized. At this time, the charging gun head may be energized, which may cause electric shock injury or death.

[0084] To test the effect of the elastic coefficient of the reset component 110 on whether the first contact 105 and the second contact 106 separate or make contact, the inventors conducted relevant tests. The test method involved selecting reset components 110 with different elastic coefficients, while keeping all other components in the charging gun identical. The test was conducted to see if the charging gun with this switch structure could be plugged into the charging receiver of the new energy vehicle. If it could not be plugged in, it was considered unqualified. Furthermore, even if it could be plugged in, after the current was turned on, the first contact 105 and the second contact 106 could not connect, preventing current conduction inside the charging gun and thus preventing charging of the new energy vehicle. This situation was also considered unqualified. For charging guns that could be plugged into and charged the new energy vehicle, after the charging gun was separated from the new energy vehicle, a test pen was used to check whether the charging terminal 101 of the charging gun was energized. If it was energized, it was considered unqualified. The results are shown in Table 3.

[0085] Table 3 shows the effect of the spring coefficient of the reset element on whether the first contact and the second contact separate or make contact.

[0086] As can be seen from Table 3, when the elastic modulus of the reset component is greater than 7.4 N / mm, there are cases where the charging gun cannot be matched with the charging receiver of the new energy vehicle, and even if the two can be matched, there are cases where the new energy vehicle cannot be charged. Therefore, the test result is unqualified in this case. When the elastic modulus of the reset component is less than 0.6 N / mm, there are cases where the charging terminal 101 of the charging gun is energized after the charging gun is separated from the charging receiver of the new energy vehicle. Therefore, the test result is also unqualified in this case. Therefore, the inventors chose the elastic modulus of the reset component to be between 0.6 N / mm and 7.4 N / mm.

[0087] Furthermore, the reset member 110 is a compression elastic member, which is insulatedly connected between the adapter terminal 102 and the power terminal 104.

[0088] In a specific implementation, by placing a compression elastic element between the adapter terminal 102 and the power terminal 104, during the process of the push rod 107 pushing the adapter terminal 102 toward the power terminal, the compression elastic element deforms due to compression. After the charging gun is separated from the electrical equipment (e.g., a new energy vehicle), during the process of the compression elastic element returning to its original state, a force away from the power terminal 104 is applied to the adapter terminal 102, so that the first contact 105 and the second contact 106 are separated.

[0089] In specific implementation, the two ends of the compression elastic member can be fixed to one side of the adapter terminal 101 and the other side of the power terminal 104, respectively. Alternatively, one end of the compression elastic member can be fixedly connected to the adapter terminal 101 or the power terminal 104, and the other end can abut against the opposite side. Or, a groove can be provided on one side of the adapter terminal 101 and the other side of the power terminal 104, and the two ends of the compression elastic member can abut against the groove. All of these methods can achieve the function of separating the first contact 105 and the second contact 106. As for which method the inventor uses, it is not limited here.

[0090] Furthermore, the reset member 110 is a tensile elastic member, which is insulated and fixedly connected between the adapter terminal 102 and the terminal fixing device 100, and / or, the tensile elastic member is constructed as a tensile spring-shaped wire, one end of which is connected to the charging terminal 101 and the other end is connected to the adapter terminal 102.

[0091] In a specific implementation, the reset member 110 can also be set as a tensile elastic member. By fixing the tensile elastic member between the terminal fixing device 100 and the adapter terminal 102, the tensile elastic member undergoes tensile deformation during the process of the push rod 107 pushing the adapter terminal 102 toward the power terminal 104. After the charging gun is separated from the electrical equipment (e.g., a new energy vehicle), the tensile elastic member returns to its original state, and a force away from the power terminal 104 is applied to the adapter terminal 102 so that the first contact 105 and the second contact 106 are separated, thereby ensuring that the charging terminal 101 is not energized when the charging gun is in a non-working state.

[0092] Furthermore, the terminal fixing device 100 is provided with a sealing cover 111 on the side near the adapter terminal 102. The sealing cover 111 is fixed on the terminal fixing device 100 and is sealed to the terminal fixing device 100. A first through hole 112 is provided on the sealing cover 111 at a position corresponding to the charging terminal 101. A sealing ring is provided in the first through hole 112, and the sealing ring seals the charging terminal 101 with the side wall of the first through hole 112.

[0093] Furthermore, such as Figure 1 , Figure 5 , Figure 6 As shown, a second through hole 103 is provided on the sealing cover 111 at a position corresponding to the push rod 107. The second through hole 103 is also provided with a sealing sleeve 113 to seal the second through hole 103. The central part of the sealing sleeve 113 moves with the push rod.

[0094] In a specific implementation, the switch structure is further provided with a sealing sleeve clamping ring 114. The sealing sleeve 113 includes a cylindrical body 115 and an annular sealing ring 116 fitted onto the cylindrical body 115. The inner wall of the annular sealing ring 116 is connected to the opening edge of the cylindrical body 115 through a sealing extension 117, which covers part of the cylindrical body 115. The sealing sleeve clamping ring 114 fixes the two side walls of the annular sealing ring 116 between the sealing cover 111 and the sealing sleeve clamping ring 114. The sealing sleeve 113 fits onto one end of the push rod 107 that is exposed on the outside of the sealing cover 111.

[0095] In a specific implementation, a sealing ring is provided between the charging terminal 101 and the side wall of the first through hole 112. Due to the setting of the sealing ring and the sealed connection between the sealing cover 111 and the terminal fixing device 100, the charging terminals 101 are mutually insulated. Therefore, by setting the sealing cover 111, the structural stability of the charging gun can be further increased and the service life of the charging gun can be extended.

[0096] In specific implementation, by providing a sealing sleeve 113 on the outside and / or inside the second through hole 103 through which the push rod 107 passes, and a sealing sleeve clamping ring 114 integral with the sealing sleeve 113, the second through hole 103 can be sealed. In this case, if water enters on the side of the charging gun connected to external electrical equipment (e.g., a new energy vehicle), the water will not enter between the sealing cover 111 and the power terminal 104 due to the obstruction of the sealing sleeve 113, thus avoiding personal injury and property damage caused by circuit breakage during the charging of new energy vehicles.

[0097] In practical applications, this switch structure is installed in a charging gun. A sealed housing is provided on the outside of the charging gun, exposing the side of the switch structure connected to the external electrical equipment (i.e., the end of the charging terminal 101 connected to the external electrical equipment). The housing completely seals and encloses the terminal fixing device 100, the adapter terminal 102, the power terminal 104, and the portion of the cable connected to the power terminal 104. By providing a sealing sleeve 113 and a sealing cover 111, water or debris can be prevented from entering the charging gun cavity through the second through hole 103 through which the push rod 107 passes.

[0098] In specific implementation, the sealing sleeve 113 can be made of elastic silicone. The material of the sealing sleeve 113 is not limited here, as long as the purpose of the present invention is achieved.

[0099] This disclosure discloses a switch structure for a charging gun, the switch structure further including a push bracket 118 slidably connected to the sealing cover 111, the push bracket 118 being used to mount the adapter terminal 102, the push rod 107 pushing the sealing sleeve 113, causing the push bracket 118 to translate axially; the push bracket 118 is provided with at least one first fixing part 119, each first fixing part 119 abutting against the side surface of the adapter terminal 109 opposite to the first contact 105.

[0100] In practice, by setting a push bracket 118 and a first fixing part 119 on the push bracket 118, multiple adapter terminals 102 can be firmly fixed on the push bracket 118. This allows multiple adapter terminals 102 to be moved at the same displacement when the push bracket 118 is pushed by a push rod 107, simplifying the production process and reducing the size of the charging gun.

[0101] In specific implementation, a sliding limiting part 126 can be provided in the axial direction of the push bracket 118, and a sliding groove 127 can be provided in the axial direction of the sealing cover 111 of the terminal fixing device 100. The sliding limiting part 126 slides in the sliding groove 127 to prevent the push bracket 118 from shifting, thus ensuring the connection between the first contact 105 and the second contact 106.

[0102] In specific implementation, when the reset member 110 is a telescopic elastic member, the reset member 110 can be set between the push bracket 118 and the terminal fixing device 100. The push rod 107 pushes the push bracket 118 to drive the first contact 105 and the second contact 106 on the adapter terminal 102 to make contact and connect, thereby playing the role of electrical connection.

[0103] Furthermore, such as Figure 2 As shown, the adapter terminal 102 includes a charging terminal connector 120 and a power terminal connector 121. The charging terminal connector 120 and the power terminal connector 121 are bent and connected in an L-shape. The charging terminal connector 120 is electrically connected to the corresponding charging terminal 101. The power terminal connector 121 is provided with a first contact 105 on the side facing the power terminal 104. The first contact 105 is disposed opposite to the second contact 106.

[0104] In specific implementation, the shape of the adapter terminal 102 is not particularly limited. It is sufficient that the adapter terminal 102 can be fixedly mounted on the push bracket 118 to achieve contact connection between the first contact 105 and the second contact 106. In actual production, the specific shape of the adapter terminal 102 can be set according to actual needs.

[0105] Furthermore, the power terminal connector 120 is elastic, and when the first contact 105 contacts the second contact 106, the pressure applied by the power terminal connector 121 to the second contact 106 is 5N-95N.

[0106] In practice, the flexible design of the power terminal connector 120 can prevent the first contact 105 and the second contact 106 from being loosely connected, thus preventing damage to new energy vehicles.

[0107] The power terminal connector 120 is used in a charging gun. The power terminal connector 120 is elastic, which increases the stability of the connection between the first contact 105 and the second contact 106, preventing loose connections between them. Based on experimental results, the inventors set the pressure applied to the second contact 106 by the power terminal connector 121 to be between 5N and 95N.

[0108] To test the effect of the pressure applied by the power terminal connector 121 to the second contact 106 on conductivity, the inventors selected 10 pairs of identical power terminal connectors 121 with different pressures applied to the second contact 106. The conductivity and temperature rise at the contact point between the first contact 105 and the second contact 106 were then tested. In this embodiment, a conductivity greater than 99% and a temperature rise less than 50K are considered ideal. The test results are shown in Table 4.

[0109] The conductivity test involves energizing the power terminal connector 121 with the second contact 106 and then detecting the conductivity at the point where the first contact 105 and the second contact 106 meet. In this embodiment, a conductivity greater than 99% is considered ideal.

[0110] The temperature rise test involves connecting the first contact 105 and the second contact 106 with the same current, and measuring the temperature at the contact point before power-on and after temperature stabilization in a closed environment. The absolute value of the difference is then taken. In this embodiment, a temperature rise greater than 50K is considered unacceptable.

[0111] Table 4 shows the effect of applying different pressures to the second contact 106 via the power terminal connector 121 on conductivity and temperature rise.

[0112]

[0113] Table 4 shows that when the pressure is less than 5N, it is impossible to simultaneously satisfy the requirements of conductivity greater than 99% and temperature rise less than 50K. Therefore, the experimental values ​​obtained when the pressure is less than 5N do not meet the actual needs. When the pressure is greater than or equal to 5N, the conductivity is good, and the temperature rise is also less than 50K. However, when the pressure is greater than 95N, the conductivity increase is not significant, the temperature rise tends to stabilize, and processing becomes difficult. Therefore, the inventors believe that the preferred pressure is 5N-95N. Similarly, Table 4 shows that the conductivity is better when the pressure is greater than or equal to 20N, while the conductivity increase is not significant when the pressure is greater than 86N. Therefore, the inventors further prefer a pressure of 20N-86N.

[0114] The present disclosure discloses a switch structure for a charging gun, the switch structure further comprising a power terminal fixing device 122, the power terminal fixing device 122 being provided with at least one second fixing part 123, each of the second fixing parts 123 being used to abut against the side surface of the power terminal 104 opposite to the second contact 106.

[0115] In practice, by setting the power terminal fixing device 122 and the second fixing part 123, the power terminal 104 can be firmly fixed to the power terminal fixing device 122, preventing the power terminal 104 from shifting, avoiding the situation of loose connection between the first contact 105 and the second contact 106, and extending the service life of the charging gun.

[0116] Furthermore, such as Figure 2As shown, the power terminal 104 includes an adapter terminal connector 124 and a cable connector 125. The adapter terminal connector 124 and the cable connector 125 are bent and connected in an L-shape. The adapter terminal connector 124 is provided with a second contact 106 on the side facing the adapter terminal 102. The second contact 106 is disposed opposite to the first contact 105. The cable connector 125 is connected to the cable of the charging gun through a channel provided on the power terminal fixing device 122.

[0117] In specific implementation, the shape of the power terminal 104 is not particularly limited. It is sufficient that the power terminal 104 can be fixedly mounted on the power terminal fixing device 122 to achieve the contact connection between the first contact 105 and the second contact 106. In actual production, the specific shape of the power terminal 104 can be set according to actual needs.

[0118] In a specific implementation, when the reset member 110 is a compression elastic member, the reset member 110 can be set between the push bracket 118 and the power terminal fixing device 122. The push rod 107 pushes the push bracket 118 to drive the first contact 105 on the adapter terminal 102 to contact and connect with the second contact 106 on the power terminal 104 on the power terminal fixing device 122, thereby achieving the function of electrical connection.

[0119] Furthermore, the adapter terminal connector 124 is elastic, and when the first contact 105 contacts the second contact 106, the pressure applied by the adapter terminal connector 124 to the first contact 105 is 5N-95N.

[0120] In practice, the flexible design of the adapter terminal connector 124 can prevent the first contact 105 from being loosely connected to the second contact 106, thus avoiding any harm to the new energy vehicle.

[0121] To test the effect of the pressure applied by the adapter terminal connector 124 to the first contact 105 on conductivity, the inventors selected 10 pairs of identically shaped adapter terminal connectors 124 with different pressures applied to the first contact 105, and tested the conductivity and temperature rise at the contact point between the first contact 105 and the second contact 106. In this embodiment, a conductivity greater than 99% and a temperature rise less than 50K are considered ideal values. The test results are shown in Table 5.

[0122] The conductivity test involves energizing the adapter terminal connector 124 after it comes into contact with the first contact 105, and then measuring the conductivity at the point where the first contact 105 and the second contact 106 meet. In this embodiment, a conductivity greater than 99% is considered ideal.

[0123] The temperature rise test involves connecting the first contact 105 and the second contact 106 with the same current, and measuring the temperature at the connection point before power-on and after temperature stabilization in a closed environment. The absolute value of the difference is then taken. In this embodiment, a temperature rise greater than 50K is considered unacceptable.

[0124] Table 5 shows the effect of applying different pressures to the first contact 105 on the conductivity of the adapter terminal connector 124.

[0125]

[0126] Table 5 shows that when the pressure is less than 5 N, it is impossible to simultaneously satisfy the requirements of conductivity greater than 99% and temperature rise less than 50 K. Therefore, the experimental values ​​obtained when the pressure is less than 5 N do not meet the actual needs. When the pressure is greater than or equal to 5 N, the conductivity is good, and the temperature rise is also less than 50 K. When the pressure is greater than 95 N, the conductivity is also excellent. However, when the pressure is greater than 95 N, the increase in conductivity is not significant, the temperature rise tends to stabilize, and processing becomes difficult. Therefore, the inventors believe that the preferred pressure is 5 N-95 N. Similarly, Table 5 shows that the conductivity is better when the pressure is greater than or equal to 20 N, while the increase in conductivity is not significant when the pressure is greater than 86 N. Therefore, the inventors further prefer a pressure of 20 N-86 N.

[0127] Furthermore, such as Figure 2 As shown, the power terminal 104 is also provided with an elastic piece 128, one end of which is connected to the end of the adapter terminal connector 124, and the other end abuts against the second fixing part 123.

[0128] In practical implementation, by setting the elastic sheet 128, the interaction force between the first contact 105 and the second contact 109 can be increased when they are connected, so as to avoid the first contact 105 and the second contact 106 from disconnecting and causing a loose connection, thus avoiding property damage caused by damage to electrical equipment.

[0129] Furthermore, the charging terminal 101 includes a positive terminal and a negative terminal, and the positive terminal and the negative terminal are electrically connected to the corresponding adapter terminal 102 through the telescopic member.

[0130] Furthermore, the charging terminal 101 includes a signal line terminal and a PE line terminal, and the signal line terminal and the PE line terminal are electrically connected to the corresponding adapter terminal 102 through the telescopic member.

[0131] In practice, there is no limit to the number of charging terminals 101. Depending on the specific requirements, there can be multiple charging terminals.

[0132] The present invention discloses a switch structure for a charging gun, wherein the shortest distance between the first contact 105 and the second contact 106 is less than or equal to the distance by which the push rod 107 pushes the adapter terminal 102 to move.

[0133] In specific implementation, the distance between the first contact 105 and the second contact 106 can be less than the distance by which the push rod 107 pushes the adapter terminal 102 to move, which can prevent the first contact 105 and the second contact 106 from having a loose connection and increase the stability of the connection between the first contact 105 and the second contact 106.

[0134] In specific implementation, the displacement of the push rod 107 pushing the adapter terminal 102 to move is 3.6mm, and the minimum distance between the first contact 105 and the second contact 106 is 2.6mm. At this time, since the distance between the first contact 105 and the second contact 106 is less than the distance of the push rod 107 pushing the adapter terminal 102 to move, the interference fit between the first contact 105 and the second contact 106 can make the connection between the two tighter and ensure the stability of the electrical connection between the first contact 105 and the second contact 106.

[0135] In practice, the portion of the distance by which the push rod 107 moves the adapter terminal 102 that is greater than the distance between the first contact 105 and the second contact 106 can be offset by the reset member 110.

[0136] For example, if the distance between the first contact 105 and the second contact 106 is less than the distance that the push rod 107 can push the adapter terminal 102 to move, the connection between the first contact 105 and the second contact 106 can be achieved by providing a compression elastic element between the adapter terminal 102 and the power electronics 104 and by the deformation of the compression elastic element.

[0137] For example, the distance between the first contact 105 and the second contact 106 is equal to the distance the push rod 107 pushes the adapter terminal 102 to move. The connection between the first contact 105 and the second contact 106 can be achieved by providing a tension elastic member between the charging terminal 101 and the adapter terminal 104. In this case, the distance between the first contact 105 and the second contact 106 can also be set to be less than the distance the push rod 107 pushes the adapter terminal 102 to move. In this case, the connection between the first contact 105 and the second contact 106 can also be achieved by the elastic setting of the power terminal connector 120 and / or the adapter terminal connector 124.

[0138] In actual production, as long as the first contact 105 and the second contact 106 can make contact, the method used is not limited here.

[0139] Furthermore, the outer periphery of the switch structure is provided with an injection molded part, which insulates and seals the terminal fixing device 100, the adapter terminal 102, the power terminal 104 and part of the cable connected to the power terminal 104, and exposes one end of the opening of the cavity structure.

[0140] In practice, by setting injection-molded parts, the charging gun can be fixed, protected, and insulated to a certain extent, thus extending its service life and preventing the user's life from being endangered due to damage to the charging gun body.

[0141] A charging gun includes a switch structure for charging gun and a housing as described in any of the above embodiments, wherein the terminal fixing device, the power terminal fixing device and the cable are fixed inside the housing.

[0142] A charging device includes a charging gun as described in any of the above embodiments, and a charging socket that mates with the charging gun. The charging socket is provided with a push rod. When the charging gun mates with the charging socket, the push rod abuts against the push rod 107 and pushes the push rod 107 to translate axially, thereby causing the first contact 105 to contact the second contact 106.

[0143] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A switch structure for a charging gun, characterized by, The utility model relates to a terminal fixing device, a charging terminal, an adapter terminal, a power supply terminal, a push rod and a sealing cover. The terminal fixing device is provided with at least two cavities arranged axially. The charging terminal is arranged at least partially in the cavities. One end of the adapter terminal is electrically connected with the charging terminal, and the other end is provided with a first contact. One end of the power supply terminal is provided with a second contact, and the other end is electrically connected with the cable of the charging gun. The push rod is arranged at least partially in the cavities and arranged in the axial direction in the cavities. The push rod is arranged to control the adapter terminal to translate in the axial direction, so that the first contact is in contact with or separated from the second contact. The terminal fixing device is further provided with a sealing cover on the side close to the adapter terminal, the sealing cover is fixed on the terminal fixing device and is in sealing connection with the terminal fixing device, a first through hole is arranged on the sealing cover at the position corresponding to the charging terminal, a sealing ring is arranged in the first through hole, and the sealing ring seals between the charging terminal and the side wall of the first through hole. A second through hole is arranged on the sealing cover at the position corresponding to the push rod, and a sealing sleeve sealing the second through hole is further arranged, and the center part of the sealing sleeve follows the push rod to translate. The sealing sleeve further comprises a cylinder and a ring-shaped sealing ring sleeved on the cylinder, the inner wall of the ring-shaped sealing ring is connected with the opening edge of the cylinder through a sealing extension part, and the sealing extension part covers part of the cylinder.

2. The switch structure for a charging gun according to claim 1, characterized by, The first contact and the second contact have a contact resistance less than 9 mΩ.

3. The switch structure for a charging gun according to claim 1, characterized by, The switch structure further comprises a telescopic member, one end of the telescopic member is connected with the charging terminal, and the other end is connected with the adapter terminal.

4. The switch structure for a charging gun according to claim 3, characterized by, The telescopic member is configured as a tensile spring-shaped conductive wire, and the tensile spring-shaped conductive wire applies a force away from the power supply terminal to the adapter terminal.

5. The switch structure for a charging gun according to claim 3, characterized by, The telescopic member is configured as a relative sliding device, the relative sliding device comprises a fixed part and a sliding part, the fixed part is arranged at one end of the charging terminal adjacent to the adapter terminal, the sliding part is arranged at one end of the adapter terminal adjacent to the charging terminal, and the sliding part slides relative to the fixed part and is in contact connection.

6. The switch structure for a charging gun according to claim 5, characterized in that, The fixed part and the sliding part have a contact resistance less than 9 mΩ.

7. The switch structure for a charging gun according to claim 1, characterized by, The switch structure further comprises a reset member, the reset member is arranged to provide a force away from the power supply terminal to the adapter terminal, so that the first contact is separated from the second contact.

8. The switch structure for a charging gun according to claim 7, characterized in that, The elastic coefficient of the reset member is 0.6 N / mm to 7.4 N / mm.

9. The switch structure for a charging gun according to claim 7, characterized by, The reset member is a compression elastic member, and the compression elastic member is in insulating connection between the adapter terminal and the power supply terminal.

10. The switch structure for a charging gun according to claim 7, characterized by, The reset member is a tensile elastic member, which is fixedly connected between the adapter terminal and the terminal fixing device in an insulated manner, and / or the tensile elastic member is configured as a tensile spring-shaped wire, one end of which is connected to the charging terminal and the other end of which is connected to the adapter terminal.

11. The switch structure for a charging gun according to claim 1, characterized by, The switch structure further comprises a pushing bracket in sliding connection with the sealing cover, the pushing bracket being used for mounting the adapter terminal, the push rod pushing the sealing sleeve to drive the pushing bracket to translate along the axial direction; the pushing bracket is provided with at least one first fixing portion, each first fixing portion abutting against a side surface of the adapter terminal opposite to the first contact.

12. The switch structure for a charging gun according to claim 1, characterized by, The adapter terminal comprises a charging terminal connecting piece and a power terminal connecting piece, the charging terminal connecting piece and the power terminal connecting piece being connected in an L shape by bending, the charging terminal connecting piece being electrically connected to the corresponding charging terminal, and the power terminal connecting piece being provided with the first contact on a side of the power terminal, the first contact being oppositely arranged with the second contact.

13. The switch structure for a charging gun according to claim 12, characterized in that, The power terminal connecting piece is elastic, and when the first contact is in contact with the second contact, the power terminal connecting piece applies a pressure of 5N-95N to the second contact.

14. The switch structure for a charging gun according to claim 1, characterized by, The switch structure further comprises a power terminal fixing device, the power terminal fixing device being provided with at least one second fixing portion, each second fixing portion abutting against a side surface of the power terminal opposite to the second contact.

15. The switch structure for a charging gun according to claim 14, characterized in that, The power terminal comprises an adapter terminal connecting piece and a cable connecting piece, the adapter terminal connecting piece and the cable connecting piece being connected in an L shape by bending, the adapter terminal connecting piece being provided with the second contact on a side of the adapter terminal, the second contact being oppositely arranged with the first contact; and the cable connecting piece is connected to the cable of the charging gun through a channel provided on the power terminal fixing device.

16. The switch structure for a charging gun according to claim 15, characterized in that, The adapter terminal connecting piece is elastic, and when the first contact is in contact with the second contact, the adapter terminal connecting piece applies a pressure of 5N-95N to the first contact.

17. The switch structure for a charging gun according to claim 15, characterized by, The power terminal is further provided with an elastic sheet, one end of the elastic sheet being connected to an end of the adapter terminal connecting piece, and the other end of the elastic sheet abutting against the second fixing portion.

18. The switch structure for a charging gun according to claim 3, characterized by, The charging terminal comprises a positive terminal and a negative terminal, the positive terminal and the negative terminal being electrically connected to the corresponding adapter terminal through the telescopic member.

19. The switch structure for a charging gun according to claim 3, characterized by, The charging terminal comprises a signal line terminal and a PE line terminal, the signal line terminal and the PE line terminal being electrically connected to the corresponding adapter terminal through the telescopic member.

20. The switch structure for a charging gun according to any one of claims 1-19, characterized in that, The shortest distance between the first contact and the second contact is less than or equal to the distance by which the push rod drives the adapter terminal to move.

21. A charging gun, characterized in that The switch structure for the charging gun according to any one of claims 1-19 and a shell are provided, the terminal fixing device, the power terminal fixing device and the cable being fixed in the shell.

22. A charging device, characterized by The charging gun of claim 21, and a charging socket matched with the charging gun, wherein an ejection rod is arranged in the charging socket, and when the charging gun is matched with the charging socket, the ejection rod abuts against the push rod and pushes the push rod to translate along the axial direction, so as to drive the first contact to contact the second contact.

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