CN114050434A

CN114050434A - Switch structure for charging gun, charging gun and charging device

Info

Publication number: CN114050434A
Application number: CN202111429999.8A
Authority: CN
Inventors: 王超; 麻祥录
Original assignee: Changchun Jetty Automotive Parts Co Ltd
Current assignee: Changchun Jetty Automotive Parts Co Ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-02-15
Also published as: WO2023093611A1

Abstract

The invention discloses a switch structure for a charging gun, the charging gun and a charging device, comprising a terminal fixing device, at least one charging terminal, at least one switching terminal, at least one power supply terminal and a push rod, wherein the terminal fixing device is connected with the charging terminal through the switching terminal; the terminal fixing device is axially provided with at least two cavities; the charging terminal is at least partially disposed within the cavity; one end of the switching terminal is electrically connected with the charging terminal, and the other end of the switching terminal is provided with a first contact; one end of the power supply terminal is provided with a second contact, and the other end of the power supply terminal is electrically connected with a cable of the charging gun; the push rod is at least partially arranged in the cavity and translates in the axial direction in the cavity; the push rod is used for controlling the switching terminal to translate along the axial direction, so that the first contact is contacted with or separated from the second contact. According to the utility model discloses a switch structure for rifle charges, when the rifle that charges is not for new energy automobile charges, realize that the rifle that charges terminal is uncharged, prevents that personnel from electrocuteeing.

Description

Switch structure for charging gun, charging gun and charging device

Technical Field

The invention relates to the technical field of new energy vehicle charging equipment, in particular to a switch structure for a charging gun, the charging gun and a charging device.

Background

With the release of the national energy saving and emission reduction policy and the increasing progress of the technology, new energy charging vehicles have been popularized, so, for the charging gun for charging new energy vehicles, safety is the most important factor, at present, the charging gun is generally set to be high-current and high-power, and the power utilization safety is particularly important for users and manufacturers, how to improve a switch structure for the charging gun, in a non-working state, the charging gun head is not charged, even if the charging gun head contacts a charging terminal of the charging gun head through misoperation, electric shock cannot be caused, and meanwhile, a waterproof effect is achieved, so that how to avoid the charging terminal of the charging gun head from being charged is avoided, and meanwhile, the switch structure for the charging gun with the waterproof function becomes a technical problem which needs to be solved urgently in the field.

Disclosure of Invention

The invention aims to provide a novel technical scheme of a switch structure for a charging gun.

According to a first aspect of the present invention, there is provided a switch structure for a charging gun, comprising,

the terminal fixing device is axially provided with at least two cavities;

at least one charging terminal at least partially disposed within the cavity;

the switching terminal is electrically connected with the charging terminal at one end and provided with a first contact at the other end;

at least one power terminal, wherein one end of the power terminal is provided with a second contact, and the other end of the power terminal is electrically connected with a cable of the charging gun;

a push rod at least partially disposed within the cavity and disposed along an axial direction within the cavity;

the push rod is used for controlling the switching terminal to translate along the axial direction, so that the first contact is contacted with or separated from the second contact.

Optionally, a contact resistance of the first contact after contacting the second contact is less than 9m Ω.

Optionally, the switch structure further includes an expansion piece, one end of the expansion piece is connected to the charging terminal, and the other end of the expansion piece is connected to the transfer terminal.

Optionally, the telescoping member is configured as an extension spring-like conductive wire that applies a force to the adaptor terminal away from the power supply terminal.

Alternatively, the expansion member is configured as a relative sliding device including a fixing portion provided at an end of the charging terminal adjacent to the adapter terminal and a sliding portion provided at an end of the adapter terminal adjacent to the charging terminal, the sliding portion being slidably and contactingly connected with the fixing portion.

Optionally, a contact resistance of the fixed portion after contact with the sliding portion is less than 9m Ω.

Optionally, the switch structure further comprises a reset element configured to provide a force to the transfer terminal in a direction away from the power terminal, so as to separate the first contact from the second contact.

Optionally, the elastic coefficient of the resetting piece is 0.6N/mm to 7.4N/mm.

Optionally, the reset element is a compression elastic element, and the compression elastic element is connected between the switching terminal and the power supply terminal in an insulating manner.

Optionally, the reset element is a tensile elastic element fixedly connected between the adaptor terminal and the terminal fixing device in an insulating manner, and/or the tensile elastic element is configured as a tensile spring-shaped wire, one end of the tensile spring-shaped wire is connected with the charging terminal, and the other end of the tensile spring-shaped wire is connected with the adaptor terminal.

Optionally, a sealing cover is further disposed on the terminal fixing device on a side close to the adaptor terminal, and the sealing cover is fixed on the terminal fixing device and is connected to the terminal fixing device in a sealing manner; the position that corresponds with the terminal that charges on the sealed lid sets up first through-hole, set up the sealing washer in the first through-hole, the sealing washer makes charge the terminal with it is sealed between the first through-hole lateral wall.

Optionally, a second through hole is formed in the position, corresponding to the push rod, of the seal cover body, a seal sleeve for sealing the second through hole is further arranged in the second through hole, and the center portion of the seal sleeve translates along with the push rod.

Optionally, the switch structure further includes a pushing bracket slidably connected to the sealing cover body, the pushing bracket is used for mounting the switching terminal, and the push rod pushes the sealing sleeve to drive the pushing bracket to translate along an axial direction; the pushing support is correspondingly provided with at least one first fixing part, and each first fixing part is abutted to one side surface of the switching terminal, which is back to the first contact.

Optionally, the adapter terminal includes a charging terminal connector and a power terminal connector, the charging terminal connector and the power terminal connector are bent and connected into an L shape, the charging terminal connector is electrically connected to the corresponding charging terminal, the power terminal connector is provided with the first contact toward one side of the power terminal, and the first contact is opposite to the second contact.

Optionally, the power terminal connector has elasticity, and when the first contact contacts with the second contact, the power terminal connector applies a pressure to the second contact of 5N-95N.

Optionally, the switch structure further includes a power terminal fixing device, the power terminal fixing device is provided with at least one second fixing portion, and each second fixing portion abuts against a side surface of the power terminal opposite to the second contact.

Optionally, the power terminal includes a switching terminal connector and a cable connector, the switching terminal connector and the cable connector are bent and connected to form an L shape, the second contact is disposed on one side of the switching terminal connector facing the switching terminal, and the second contact is disposed opposite to the first contact; the cable connecting piece is connected with a cable of the charging gun through a channel arranged on the power terminal fixing device.

Optionally, the through terminal connector has elasticity, and when the first contact contacts with the second contact, the through terminal connector applies a pressure to the first contact of 5N-95N.

Optionally, the power terminal is further provided with an elastic piece, one end of the elastic piece is connected with the end of the adapter terminal connecting piece, and the other end of the elastic piece is abutted to the second fixing portion.

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 adaptor terminal through the expansion piece.

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 with the corresponding switching terminal through the telescopic piece.

Optionally, the shortest distance between the first contact and the second contact is less than or equal to the distance that the push rod pushes the transfer terminal to move.

According to a second aspect of the present invention, there is provided a charging gun comprising the switch structure for a charging gun as described above and a housing in which the terminal fixture, the power terminal fixture and the cable are fixed.

According to a third aspect of the present invention, a charging device is provided, which includes the charging gun as described above, and a charging socket mated with the charging gun, wherein an ejector rod is disposed in the charging socket, and when the charging gun is mated with the charging socket, the ejector rod abuts against the push rod and pushes the push rod to translate along an axial direction, so as to drive the first contact to contact with the second contact.

According to this switch structure for rifle that charges of this disclosure, have following effect:

1. according to the switch structure for the charging gun, when the gun head of the charging gun is not used for charging a new energy automobile, the charging terminal of the charging gun is not electrified, and people are prevented from getting an electric shock.

2. In the charging gun in the prior art, the charging terminal of the charging gun is controlled to be uncharged by using the circuit board, and the circuit board is not needed by the switch structure for the charging gun, so that the production cost is reduced.

3. According to the switch structure for the charging gun, when a small amount of accumulated water is arranged at the end part of the charging gun, the accumulated water is prevented from entering the charging gun, so that the normal use of the charging gun is influenced, and short circuit, casualties and combustion accidents caused by the accumulated water are avoided.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is an exploded view of a switch structure for a charging gun according to the present invention;

FIG. 2 is a schematic diagram of a relay terminal and power supply terminal of the present invention;

fig. 3 is a perspective view of a switch structure for a charging gun according to the present invention;

FIG. 4 is a side view of the switch structure for the charging gun of the present invention;

figure 5 is a schematic view of the structure of the sealing sleeve of the invention;

figure 6 is a longitudinal section of the sealing sleeve of the invention;

the figures are labeled as follows:

100-terminal fixture; 101-a charging terminal; 102-a transfer terminal; 103-a second via; 104-a power supply terminal; 105-a first contact; 106-a second contact; 107-push rod; 108-a fixed part; 109-a sliding part; 110-a reset member; 111-a sealing cover body; 112-a first via; 113-sealing sleeve; 114-a sealing compression ring; 115-cylinder; 116-annular seal ring; 117-sealing the extension; 118-a push stent; 119-a first fixation part; 120-a charging terminal connection; 121-power terminal connections; 122-power terminal fixture; 123-a second fixed part; 124-transition terminal connections; 125-cable connection; 126-a slide stop; 127-a sliding groove; 128-elastic sheet.

Detailed Description

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

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

A switch structure for a charging gun of the present disclosure, as shown in fig. 1 to 6, includes,

the terminal fixing device 100, wherein at least two cavities are axially arranged on the terminal fixing device 100;

at least one charging terminal 101, the charging terminal 101 at least partially disposed within the cavity;

at least one transfer terminal 102, wherein one end of the transfer terminal 102 is electrically connected with the charging terminal 101, and the other end is provided with a first contact 105;

at least one power terminal 104, wherein one end of the power terminal 104 is provided with a second contact 106, and the other end is electrically connected with a cable of the charging gun;

a push rod 107, the push rod 107 being at least partially disposed within the cavity and translating within the cavity in an axial direction;

the push rod 107 is configured to control the transfer terminal 102 to translate along the axial direction, so that the first contact 105 is in contact with or separated from the second contact 106.

In specific implementation, as shown in fig. 1, 3, and 4, by separating the adapting terminal 102 from the power terminal 104, it is ensured that one side of the charging terminal is not charged in a non-working state, so as to prevent people from getting an electric shock and avoid casualties; meanwhile, the charging terminal 101 is controlled to be uncharged by using the circuit board in the charging gun in the prior art, and the circuit board is not needed by the switch structure for the charging gun, so that the production cost is reduced. And through setting up push rod 107, can be when the rifle that charges for new energy automobile, promote push rod 107 to move towards power supply terminal 104, so that first contact 105 and second contact 106 contact realize the electric conduction, and the in-process of rifle and new energy automobile separation of charging, drive push rod 107 towards the direction motion of keeping away from power supply terminal 104, push rod 107 drives switching terminal 102 motion, so that first contact 105 and second contact 106 separation, realize after rifle and new energy automobile separation of charging, the charging terminal 101 of rifle that charges is uncharged, through mechanical structure, it is uncharged when unoperated state to realize charging terminal 101, it is uncharged to compare in use circuit board control charging terminal 101, and the cost is saved, and the practicality is stronger.

In practical applications, the cavities axially disposed in the terminal fixing device 100 are cavities with openings at both ends, at least a portion of each charging terminal 101 penetrates through the corresponding cavity, and one end of the charging terminal 101 close to the adapting terminal 102 protrudes out of one side of the terminal fixing device 100 close to the adapting terminal 102.

In the switch structure for the charging gun, the contact resistance of the first contact 105 and the second contact 106 is less than 9m omega.

A large current is generally required to be conducted, and if the contact resistance between the first contact 105 and the second contact 106 is greater than 9m Ω, a large temperature rise occurs at the contact position, and as the temperature increases, the temperature of the adaptor terminal 102 and the power terminal 104 will increase, and the mechanical deformation will not be synchronous due to the temperature rise, and will generate internal stress, which will cause the first contact 105 and the second contact 106 to be connected in a virtual manner in severe cases, or the first contact 105 and the second contact 106 can not be separated due to melting of the two contacts, and the first contact 105 and the second contact 106 can not be contacted or separated according to the setting, or the first contact 105 and the second contact 106 are melted to cause the two contacts to be inseparable, even the new energy vehicle power supply is damaged due to the virtual connection, even the two contacts are inseparable, so that one side of the charging terminal 101 is electrified, and casualties are caused due to the contacts. Therefore, the inventors set the contact resistance after the first contact 105 and the second contact 106 are contacted to be less than 9m Ω.

In order to verify the influence of the contact resistance between the first contact 105 and the second contact 106 on the temperature rise and the conductivity of the two contacts, the inventor selects the same first contact 105 and the second contact 106 with different contact resistances and tests the conductivity and the temperature rise.

The conductivity test is to contact the first contact 105 with the second contact 106, and then detect the conductivity at the corresponding contact after applying power, in this embodiment, the conductivity is greater than 99% as an ideal value.

The temperature rise test is to apply the same current to the connection structure formed by the first contact 105 and the second contact 106, detect the temperature of the same position of the second contact 106 before power-on and after temperature stabilization in a closed environment, and take the absolute value by taking the difference. In this example, a temperature rise greater than 50K is considered unacceptable.

TABLE 1 Effect of different contact resistances between the first and second contacts on conductivity and temperature rise

As can be seen from table 1, when the contact resistance between the first contact 105 and the second contact 106 is greater than 9m Ω, the temperature rise at the contact between the first contact 105 and the second contact 106 exceeds 50K, and meanwhile, the conductivity at the contact between the first contact 105 and the second contact 106 is less than 99%, which is not in compliance with the standard requirement. Therefore, the inventors set the contact resistance after the first contact 105 is brought into contact with the second contact 106 to be less than 9m Ω.

The switch structure for the charging gun further comprises an extensible piece, one end of the extensible piece is connected with the charging terminal 101, and the other end of the extensible piece is connected with the switching terminal 102.

Further, the telescoping member is configured as an extension spring-like conductive wire that applies a force to the relay terminal 102 away from the power terminal 104.

Further, the expansion piece is configured as a relative sliding device including a fixing portion 108 and a sliding portion 109, the fixing portion 108 is disposed at an end of the charging terminal 101 adjacent to the adaptor terminal 102, the sliding portion 109 is disposed at an end of the adaptor terminal 102 adjacent to the charging terminal 101, and the sliding portion 109 is slidably and contactingly connected with the fixing portion 108.

During specific implementation, by arranging the telescopic piece, in the reciprocating motion process of the push rod 107, the switching terminal 102 is ensured not to be separated from the charging terminal 101 in the process of being close to the power supply terminal 101 or being far away from the power supply terminal 101, and the charging terminal 101 is ensured not to be separated from the switching terminal 102 when the first contact 105 is contacted with the second contact 106, so that the circuit is ensured to be conducted.

In a specific implementation, the telescopic element may be configured as an extension spring-shaped conductive wire, or as a relative sliding device, the relative sliding device includes a fixing portion 108 and a sliding portion 109, and displacement change may occur between the adaptor terminal 102 and the charging terminal 101 during the process of the adaptor terminal 102 moving towards the power terminal 104 by the elastic force of the extension spring-shaped conductive wire, and the two are not separated to ensure electrical conduction; by providing the relative sliding device, the fixed portion 108 and the sliding portion 109 are slidably and non-separately engaged, so that the adaptor terminal 102 can be electrically conducted even when the adaptor terminal 102 and the charging terminal 101 are displaced and changed in the process of moving toward the power terminal 104.

Further, the contact resistance of the fixed portion 108 after contacting the sliding portion 109 is less than 9m Ω.

Generally, a larger current needs to be conducted, if the contact resistance between the fixing portion 108 and the sliding portion 109 is greater than 9m Ω, a larger temperature rise occurs at the contact position, and the temperature is higher and higher along with the increase of time, so that the fixing portion 108 and the sliding portion 109 may generate an internal stress due to asynchronous mechanical deformation caused by the temperature rise, and in a serious case, the fixing portion 108 and the sliding portion 109 may not realize relative sliding, which causes a virtual connection or an inseparability between the first contact 105 and the second contact 106, and the first contact 105 and the second contact 106 may not be connected or separated according to the setting, or the first contact 105 and the second contact 106 may be connected in a virtual manner, or even a new energy vehicle power source may be damaged due to the virtual connection, or even the two may not be separated, so that one side of the charging terminal 101 is electrified, and a person may be injured and killed due to electric shock. Therefore, the inventors set the contact resistance of the fixed part 108 after contact with the sliding part 109 to be less than 9m Ω.

In order to verify the influence of the contact resistance between the fixed part 108 and the sliding part 109 on the temperature rise and the conductivity of the two parts, the inventor selected the same fixed part 108 and the sliding part 109 with different contact resistances, and performed the conductivity and temperature rise test.

The conductivity test is performed by contacting the fixed part 108 with the sliding part 109, and then detecting the conductivity of the corresponding connection part after applying electricity, and in this embodiment, the conductivity is greater than 99% as an ideal value.

The temperature rise test is to apply the same current to the connection structure formed by the fixed part 108 and the sliding part 109, detect the temperature of the same position of the sliding part 109 before applying the current and after stabilizing the temperature in a closed environment, and take the absolute value of the difference. In this example, a temperature rise greater than 50K is considered unacceptable.

TABLE 2 influence of different contact resistances between the fixed part 108 and the sliding part 109 on the conductivity and temperature rise

As can be seen from table 2, when the contact resistance between the fixed part 108 and the sliding part 109 is greater than 9m Ω, the temperature rise at the contact part of the fixed part 108 and the sliding part 109 exceeds 50K, and the conductivity at the contact part of the fixed part 108 and the sliding part 109 is less than 99%, which does not meet the standard requirement. Therefore, the inventors set the contact resistance after the fixed portion 108 comes into contact with the sliding portion 109 to be less than 9m Ω.

A switch arrangement for a charging gun according to the present disclosure, further comprising a reset element 110, said reset element 110 being arranged to provide a force to said transfer terminal 102 in a direction away from said power terminal 101, thereby causing said first contact 105 to separate from said second contact 106.

During the concrete implementation, through setting up piece 110 that resets, can guarantee to charge the rifle under the circumstances of non-operating condition, realize first contact 105 with second contact 106 separation, under the circumstances that does not exert external force to push rod 107, first contact 105 with second contact 106 is in the separation state always for charging terminal 101 is not electrified, avoids taking place personnel's electric shock accident.

Further, the elastic coefficient of the reset element 110 is 0.6N/mm to 7.4N/mm.

In specific implementation, the elastic coefficient of the reset piece determines whether the reset piece can contact or separate the first contact 105 and the second contact 106 according to the setting. The charging gun with the switch structure cannot be matched with a charging receiving end of a new energy automobile used in a matched manner due to the fact that the elastic coefficient is too large, so that the new energy automobile cannot be charged, or even if the charging gun with the switch structure is matched with the charging receiving end of the new energy automobile, the first contact 105 cannot be contacted with the second contact 106 due to the fact that the elastic coefficient of the reset piece 110 is too large; the elastic coefficient is too small, the reset piece 110 cannot drive the switching terminal 102 to move, the first contact 105 cannot be separated from the second contact 106, one end of the charging terminal 101 of the charging gun is electrified, and at the moment, the electric shock injury of people is possibly caused due to the electrification of the charging gun head.

In order to test the influence of the elastic coefficient of the reset piece 110 on whether the first contact 105 is separated from or contacted with the second contact 106, the inventor performs related tests, the test method is to select the reset piece 110 with different elastic coefficients, other parts in the charging gun are the same, and the charging gun provided with the switch structure is tested to test whether the charging gun can be in plug fit with the charging receiving end of the new energy automobile, if the charging gun can not be in plug fit, the charging gun is unqualified, and meanwhile, even if the plug fit can be realized, after the current is switched on, because the first contact 105 can not be connected with the second contact 106, the current conduction in the charging gun can not be realized, the new energy automobile can not be charged, and the situation is also considered to be unqualified; in the charging gun which can be in plug fit with the new energy automobile and can charge the new energy automobile, after the charging gun is separated from the new energy automobile, a test pencil is used for testing whether a charging terminal 101 of the charging gun is electrified or not, and if the charging gun is electrified, the charging gun is unqualified; the results are shown in Table 3.

TABLE 3 influence of the spring constant of the restoring member on whether the first and second contacts are separated or contacted

As can be seen from table 3, when the elastic coefficient of the reset piece is greater than 7.4N/mm, there are cases where the charging gun cannot be fitted with the charging receiving end of the new energy vehicle, and even if the two can be fitted, there is a case where the new energy vehicle cannot be charged, so the experimental result is not qualified at this time; when the elastic coefficient of the reset piece is smaller than 0.6N/mm, the situation that the charging terminal 101 of the charging gun is electrified after the charging gun is separated from the charging receiving end of the new energy automobile exists, so that the experimental result is also unqualified at the moment; therefore, the inventor selects the elastic coefficient of the reset piece to be 0.6N/mm to 7.4N/mm.

Further, the reset element 110 is a compression elastic element, and the compression elastic element is connected between the adapting terminal 102 and the power terminal 104 in an insulating manner.

In specific implementation, by arranging the compression elastic element between the adaptor terminal 102 and the power terminal 104, in the process that the push rod 107 pushes the adaptor terminal 102 to move towards the power terminal, the compression elastic element is deformed due to being compressed, and after the charging gun is separated from the electric equipment (for example, a new energy automobile), in the process that the compression elastic element is restored to the original state, a force far away from the power terminal 104 is applied to the adaptor terminal 102, so that the first contact 105 is separated from the second contact 106.

In specific implementation, two ends of the elastic compression element may be respectively fixed on one side of the adaptor terminal 101 and one side of the power terminal 104, or one end of the elastic compression element is fixedly connected to the adaptor terminal 101 or the power terminal 104, and the other end of the elastic compression element abuts against the opposite side, or a groove is formed on one side of the adaptor terminal 101 and one side of the power terminal 104, and two ends of the elastic compression element abut against the groove, so that the effect of the elastic compression element separating the first contact 105 from the second contact 106 can be achieved.

Further, the reset member 110 is a tensile elastic member fixedly connected between the adaptor terminal 102 and the terminal fixing device 100 in an insulating manner, and/or the tensile elastic member is configured as a tensile spring-shaped wire having one end connected to the charging terminal 101 and the other end connected to the adaptor terminal 102.

In specific implementation, the reset element 110 may also be a tensile elastic element, the tensile elastic element is fixedly disposed between the terminal fixing device 100 and the adaptor terminal 102, the tensile elastic element is subjected to tensile deformation in a process that the push rod 107 pushes the adaptor terminal 102 to move towards the power terminal 101, and after the charging gun is separated from an electric device (e.g., a new energy vehicle), in a process that the tensile elastic element is restored to an original state, a force away from the power terminal 104 is applied to the adaptor terminal 102, so that the first contact 105 is separated from the second contact 106, thereby ensuring that the charging terminal 101 is not charged when the charging gun is in a non-operating state.

Furthermore, the terminal fixing device 100 is further provided with a sealing cover 111 on a side close to the adaptor terminal 102, and the sealing cover 111 is fixed on the terminal fixing device 100 and is connected with the terminal fixing device 100 in a sealing manner; a first through hole 112 is formed in the sealing cover 111 at a position corresponding to the charging terminal 101, and a sealing ring is disposed in the first through hole 112, and seals between the charging terminal 101 and a sidewall of the first through hole 112.

Further, as shown in fig. 1, 5, and 6, a second through hole 103 is provided at a position on the sealing cover 111 corresponding to the push rod 107, a sealing sleeve 113 for sealing the second through hole 103 is further provided at the second through hole 103, and a central portion of the sealing sleeve 113 translates along with the push rod.

In specific implementation, the switch structure is further provided with a sealing sleeve compression ring 114, the sealing sleeve 113 comprises a cylinder body 115 and an annular sealing ring 116 sleeved on the cylinder body 115, the inner wall of the annular sealing ring 116 is connected with the edge of the opening of the cylinder body 115 through a sealing extension portion 117, and the sealing extension portion 117 covers a part of the cylinder body 115; the sealing sleeve compression ring 114 fixes two side walls of the annular sealing ring 116 between the sealing cover body 111 and the sealing sleeve compression ring 114; the sealing sleeve 113 is sleeved on one end of the push rod 107 exposed outside the sealing cover body 111.

In specific implementation, a sealing ring is disposed between the charging terminal 101 and the sidewall of the first through hole 112, and the charging terminals 101 are insulated from each other due to the arrangement of the sealing ring and the sealing connection between the sealing cover 111 and the terminal fixing device 100, so that the structural stability of the charging gun can be further increased by disposing the sealing cover 111, and the service life of the charging gun can be prolonged.

During the concrete implementation, through the outside and/or the inside seal cover 113 that sets up at the second through-hole 103 that supplies the push rod 107 to wear to and seal cover clamp ring 114 integrative with seal cover 113, can realize the sealed setting to second through-hole 103, at this moment, if there is water to get into in the one side that the rifle and the outside consumer (for example, new energy automobile) of charging are connected, because the blockking of seal cover 113, can not make water get into between sealed lid 111 and the power terminal 104, avoid being at the in-process of charging for new energy automobile, cause casualties and loss of property because of opening a circuit.

In a specific application, the switch structure is installed in a charging gun, and a sealing housing is disposed outside the charging gun, and the sealing housing integrally and hermetically encloses the terminal fixing device 100, the adaptor terminal 102, the power terminal 104 and a part of the cable connected to the power terminal 104 in a manner that one side of the switch structure connected to the external electric device (i.e., one end of the charging terminal 101 connected to the external electric device) is exposed. At this time, by arranging the sealing sleeve 113 and the sealing cover 111, water or impurities can be prevented from entering the cavity of the charging gun through the second through hole 103 formed by the push rod 107.

In specific implementation, the sealing sleeve 113 may be made of elastic silica gel, and the material of the sealing sleeve 113 is not limited herein, and only needs to wait for achieving the purpose of the present invention.

The switch structure for the charging gun further comprises a pushing support 118 connected with the sealing cover body 111 in a sliding mode, the pushing support 118 is used for mounting the switching terminal 102, the push rod 107 pushes the sealing sleeve 113 to drive the pushing support 118 to translate along the axial direction; the pushing bracket 118 is correspondingly provided with at least one first fixing portion 119, and each first fixing portion 119 abuts against a side surface of the adapting terminal 109 opposite to the first contact 105.

In specific implementation, the pushing bracket 118 and the first fixing portion 119 disposed on the pushing bracket 118 are used to firmly fix the plurality of adapter terminals 102 on the pushing bracket 118, so that the plurality of adapter terminals 102 are driven to generate the same displacement in the process of pushing the pushing bracket 118 by using one push rod 107, thereby simplifying the production process and reducing the volume of the charging gun.

In a specific implementation, the axial direction of the push bracket 118 may be provided with a sliding limiting portion 126, the axial edge of the sealing cover 111 of the terminal fixing device 100 is provided with a sliding groove 127 in a matching manner, and the sliding limiting portion 126 slides in the sliding groove 127 to prevent the push bracket 118 from shifting, so as to ensure the connection between the first contact 105 and the second contact 106.

In specific implementation, when the reset element 110 is a flexible elastic element, the reset element 110 may be disposed between the pushing bracket 118 and the terminal fixing device 100, and the pushing bracket 118 is pushed by the push rod 107 to drive the first contact 105 and the second contact 106 on the adapting terminal 102 to be in contact connection, so as to achieve the function of electrical connection.

Further, as shown in fig. 2, the adaptor 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 to form 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 the first contact 105 on a side facing the power terminal 104, and the first contact 105 is disposed opposite to the second contact 106.

In specific implementation, the shape of the adapting terminal 102 is not particularly limited, and only the adapting terminal 102 can be fixedly disposed on the pushing bracket 118 to realize the contact connection between the first contact 105 and the second contact 106, and in actual production, the specific shape of the adapting terminal 102 can be set according to actual needs.

Further, the power terminal connector 120 has elasticity, and when the first contact 105 is in contact with the second contact 106, the power terminal connector 121 applies a pressure of 5N to 95N to the second contact 106.

In specific implementation, the power terminal connecting part 120 is provided with elasticity, so that the first contact 105 and the second contact 106 can be prevented from being connected in a virtual mode, and damage to the new energy automobile can be avoided.

The power terminal connector 120 is applied to a charging gun, and the power terminal connector 120 has elasticity to increase stability of connection between the first contact 105 and the second contact 106. Avoiding a virtual connection of the first contact 105 with the second contact 106. The inventors set the pressing force applied to the second contact 106 by the power terminal connector 121 to 5N-95N according to the experimental results.

In order to test the influence of the pressure applied to the second contact 106 by the power terminal connector 121 on the conductivity, the inventor selects 10 pairs of the power terminal connectors 121 with the same shape to apply different pressures to the second contact 106 to test the conductivity and temperature rise of the contact position between the first contact 105 and the second contact 106, and in this embodiment, the conductivity is greater than 99% and the temperature rise is less than 50K as the ideal value. The test results are shown in table 4.

In the conductivity test, the power terminal connector 121 is brought into contact with the second contact 106, and then, current is applied to detect the conductivity of the contact portion between the first contact 105 and the second contact 106, and in this embodiment, the conductivity is preferably greater than 99%.

The temperature rise test is to conduct the same current after the first contact 105 and the second contact 106 are contacted, detect the temperature of the contact position of the first contact 105 and the second contact 106 before the electrification and after the temperature is stabilized in a closed environment, and perform the difference to obtain the absolute value. In this example, a temperature rise greater than 50K is considered unacceptable.

TABLE 4 influence of different pressures exerted by the power terminal connection 121 on the second contact 106 on the conductivity and temperature rise

As can be seen from Table 4, when the pressure is less than 5N, the conductivity is not more than 99% and the temperature rise is less than 50K, so that when the pressure is less than 5N, the experimental value can not meet the actual requirement. When the pressure is more than or equal to 5N, the conductivity is better, and the temperature rise value is less than 50K, but when the pressure is more than 95N, the conductivity is also excellent. However, when the pressure is more than 95N, the increase in conductivity is insignificant, the decrease in temperature rise tends to be smooth, and the processing is difficult, so the inventors consider that the preferred pressure is 5N to 95N. Similarly, as is clear from table 4, the conductive effect is better when the pressure is 20N or more, and the conductivity does not increase significantly when the pressure is 86N or more, and therefore, the pressure of 20N to 86N is further preferable by the inventors.

The switch structure for the charging gun further comprises a power terminal fixing device 122, the power terminal fixing device 122 is provided with at least one second fixing portion 123, and each second fixing portion 123 is used for abutting against one side surface of the power terminal 104, which is opposite to the second contact 106.

In specific implementation, the power terminal fixing device 122 and the second fixing portion 123 are arranged, so that the power terminal 104 can be firmly fixed on the power terminal fixing device 122, the power terminal 104 is prevented from shifting, the condition of virtual connection between the power terminal 104 and the first contact 105 and the second contact 106 is avoided, and the service life of the charging gun is prolonged.

Further, as shown in fig. 2, the power terminal 104 includes a switching terminal connector 124 and a cable connector 125, the switching terminal connector 124 and the cable connector 125 are bent and connected into an L shape, the switching terminal connector 124 is provided with a second contact 106 facing the switching terminal 102, and the second contact 106 is opposite to the first contact 105; the cable connector 125 is connected to the cable of the charging gun through a passage provided on the power terminal fixture 122.

In a specific implementation, the shape of the power terminal 104 is not particularly limited, and only the power terminal 104 can be fixedly disposed on the power terminal fixing device 122 to achieve the contact connection between the first contact 105 and the second contact 106, and in an actual production, the specific shape of the power terminal 104 can be set according to actual needs.

In specific implementation, when the reset element 110 is a compression elastic element, the reset element 110 may be disposed between the pushing bracket 118 and the power terminal fixing device 122, and the pushing rod 107 pushes the pushing bracket 118 to drive the first contact 105 on the adapting terminal 102 to contact and connect with the second contact 106 of the power terminal 104 on the power terminal fixing device 122, so as to perform an electrical connection function.

Further, the through terminal connector 124 has elasticity, and when the first contact 105 is in contact with the second contact 106, the through terminal connector 124 applies a pressure to the first contact 105 of 5N to 95N.

During the specific implementation, through the elastic setting of switching terminal connecting piece 124, can prevent first contact 105 and second contact 106 virtual connection, avoid producing harm to new energy automobile.

In order to test the influence of the pressure applied by the transit terminal connector 124 to the first contact 105 on the conductivity, the inventor selects 10 different pressures to be applied to the first contact 105 by the transit terminal connector 124 with the same shape to test the conductivity and the temperature rise of the contact between the first contact 105 and the second contact 106, and in this embodiment, the conductivity is greater than 99% and the temperature rise is less than 50K, which is a desirable value. The test results are shown in table 5.

In the conductivity test, the relay terminal connector 124 is brought into contact with the first contact 105, and then, a current is applied to detect the conductivity of the contact portion between the first contact 105 and the second contact 106, and in this embodiment, the conductivity is preferably greater than 99%.

The temperature rise test is to conduct the same current after the first contact 105 and the second contact 106 are contacted, detect the temperature at the joint of the first contact 105 and the second contact 106 before the electrification and after the temperature is stabilized in a closed environment, and perform the difference to obtain the absolute value. In this example, a temperature rise greater than 50K is considered unacceptable.

TABLE 5 influence of varying pressure applied by the transfer terminal connection 124 to the first contact 105 on conductivity

As can be seen from Table 5, when the pressure is less than 5N, the conductivity is not more than 99% and the temperature rise is less than 50K, so that when the pressure is less than 5N, the experimental value can not meet the actual requirement. When the pressure is greater than or equal to 5N, the conductivity is better, and the temperature rise value is less than 50K, and when the pressure is greater than 95N, the conductivity is excellent. However, when the pressure is more than 95N, the increase in conductivity is insignificant, the decrease in temperature rise tends to be smooth, and the processing is difficult, so the inventors consider that the preferred pressure is 5N to 95N. Similarly, as is clear from table 5, the conductive effect is better when the pressure is 20N or more, and the conductivity does not increase significantly when the pressure is 86N or more, and therefore, the pressure of 20N to 86N is further preferable by the inventors.

As shown in fig. 2, the power supply terminal 104 further includes an elastic piece 128, one end of the elastic piece 128 is connected to an end of the adaptor terminal connector 124, and the other end is abutted against the second fixing portion 123.

During the concrete implementation, through the setting of flexure strip 128, can increase mutual effort when first contact 105 is connected with second contact 109, avoid first contact 105 and second contact 106 disconnection, appear virtual connecing, avoid because of the consumer damages, cause loss of property.

Further, 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 adaptor terminal 102 through the expansion piece.

Further, 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 adaptor terminal 102 through the expansion member.

In specific implementation, the number of the charging terminals 101 is not limited, and a plurality of charging terminals may be provided according to specific requirements.

In the switch structure for the charging gun, the shortest distance between the first contact 105 and the second contact 106 is less than or equal to the distance that the push rod 107 pushes the transfer terminal 102 to move.

In specific implementation, the distance between the first contact 105 and the second contact 106 may be smaller than the distance that the push rod 107 pushes the adaptor terminal 102 to move, so as to prevent a virtual connection between the first contact 105 and the second contact 106, and increase the stability of the connection between the first contact 105 and the second contact 106.

During specific implementation, the displacement of the push rod 107 pushing the adapting terminal 102 to move is 3.6mm, the minimum distance between the first contact 105 and the second contact 106 is 2.6mm, and at this time, because the distance between the first contact 105 and the second contact 106 is smaller than the distance of the push rod 107 pushing the adapting terminal 102 to move, the interference fit between the first contact 105 and the second contact 106 can be realized, so that the connection between the first contact 105 and the second contact 106 is tighter, and the stability of the electrical connection between the first contact 105 and the second contact 106 is ensured.

In specific implementation, a portion of the push rod 107 pushing the adaptor terminal 102 to move by a distance greater than the distance between the first contact 105 and the second contact 106 can be offset by the reset element 110.

For example, the distance between the first contact 105 and the second contact 106 is smaller than the distance that the push rod 107 pushes the adaptor terminal 102 to move, a compression elastic member may be disposed between the adaptor terminal 102 and the power supply electronics 104, and the connection between the first contact 105 and the second contact 106 may be achieved by deformation of the compression elastic member.

For example, the distance between the first contact 105 and the second contact 106 is equal to the distance that the push rod 107 pushes the adaptor terminal 102 to move, the connection between the first contact 105 and the second contact 106 can be realized by disposing a tensile elastic member between the charging terminal 101 and the adaptor terminal 104, the distance between the first contact 105 and the second contact 106 can also be set to be smaller than the distance that the push rod 107 pushes the adaptor terminal 102 to move, and the connection between the first contact 105 and the second contact 106 can also be realized by the elastic arrangement of the power terminal connector 120 and/or the adaptor terminal connector 124.

In actual production, the first contact 105 and the second contact 106 may be in contact with each other, and the manner of the contact is not limited herein.

Furthermore, an injection molding piece is arranged on the periphery of the switch structure, and the injection molding piece is used for insulating, sealing and wrapping the terminal fixing device 100, the switching terminal 102, the power terminal 104 and a part of cable connected with the power terminal 104, and exposing one open end of the cavity structure.

During concrete implementation, through setting up the injection molding, can play certain fixed guard action and insulating effect to the rifle that charges, the life of rifle that charges is prolonged, prevents to charge the rifle because of the rifle body is damaged, causes harm to user's life.

A charging gun comprising the switch structure for a charging gun and a housing according to any one of the above embodiments, the terminal fixture, the power terminal fixture, and the cable being fixed within the housing.

A charging device comprises the charging gun of any one of the above embodiments, and a charging socket matched with the charging gun, wherein an ejector rod is arranged in the charging socket, and when the charging gun is matched with the charging socket, the ejector rod is abutted to the push rod 107 and pushes the push rod 107 to translate along the axial direction, so that the first contact 105 is driven to be in contact with the second contact 106.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may 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, comprising,

the terminal fixing device is axially provided with at least two cavities;

at least one charging terminal at least partially disposed within the cavity;

2. The switch structure for a charging gun according to claim 1, characterized in that a contact resistance after the first contact contacts with the second contact is less than 9m Ω.

3. The switch structure for a charging gun according to claim 1, further comprising an expansion member having one end connected to the charging terminal and the other end connected to the transfer terminal.

4. The switch structure for a charging gun of claim 3, wherein the telescoping member is configured as an extension spring-like conductive wire that applies a force to the adaptor terminal away from the power supply terminal.

5. The switch structure for a charging gun according to claim 3, wherein the telescopic member is configured as a relative sliding device including a fixing portion provided at an end of the charging terminal adjacent to the adaptor terminal and a sliding portion provided at an end of the adaptor terminal adjacent to the charging terminal, the sliding portion being slidably and contactingly connected with the fixing portion.

6. The switch structure for the charging gun according to claim 5, wherein a contact resistance after the fixed portion contacts the sliding portion is less than 9m Ω.

7. The switch structure for a charging gun of claim 1, further comprising a reset member configured to provide a force to the transfer terminal in a direction away from the power terminal to separate the first contact from the second contact.

8. The switching structure for the charging gun according to claim 7, wherein the restoring member has an elastic coefficient of 0.6N/mm to 7.4N/mm.

9. The switch structure for a charging gun according to claim 7, wherein said reset member is a compression elastic member which is insulatedly connected between said relay terminal and said power terminal.

10. The switch structure for a charging gun according to claim 7, wherein the reset member is a tensile elastic member which is fixedly connected between the adaptor terminal and the terminal fixture in an insulated manner, and/or the tensile elastic member is configured as a tensile spring-like wire having one end connected to the charging terminal and the other end connected to the adaptor terminal.

11. The switch structure for the charging gun according to claim 1, wherein the terminal fixing device is further provided with a sealing cover body on a side close to the transfer terminal, the sealing cover body is fixed on the terminal fixing device and is connected with the terminal fixing device in a sealing manner; the position that corresponds with the terminal that charges on the sealed lid sets up first through-hole, set up the sealing washer in the first through-hole, the sealing washer makes charge the terminal with it is sealed between the first through-hole lateral wall.

12. The switch structure for the charging gun according to claim 11, wherein a second through hole is provided at a position on the sealing cover body corresponding to the push rod, a sealing sleeve for sealing the second through hole is further provided at the second through hole, and a central portion of the sealing sleeve is translated along with the push rod.

13. The switch structure for the charging gun of claim 12, further comprising a pushing bracket slidably connected to the sealing cover body, wherein the pushing bracket is used for mounting the adapting terminal, and the pushing rod pushes the sealing sleeve to drive the pushing bracket to translate axially; the pushing support is correspondingly provided with at least one first fixing part, and each first fixing part is abutted to one side surface of the switching terminal, which is back to the first contact.

14. The switch structure for a charging gun according to claim 1, wherein the relay terminal includes a charging terminal connector and a power terminal connector, the charging terminal connector and the power terminal connector are bent and connected in an L-shape, the charging terminal connector is electrically connected to the corresponding charging terminal, the power terminal connector is provided with the first contact toward the power terminal side, and the first contact is provided opposite to the second contact.

15. The switch structure for a charging gun according to claim 14, wherein said power terminal connector has elasticity, and a pressing force applied to said second contact by said power terminal connector when said first contact is brought into contact with said second contact is 5N-95N.

16. The switch structure for a charging gun according to claim 1, further comprising a power terminal fixture provided with at least one second fixture, each of the second fixtures abutting against a side surface of the power terminal opposite to the second contact.

17. The switch structure for a charging gun according to claim 16, wherein the power supply terminal includes a relay terminal connector and a cable connector, the relay terminal connector and the cable connector are bent and connected in an L-shape, the relay terminal connector is provided with the second contact toward a side of the relay terminal, and the second contact is disposed opposite to the first contact; the cable connecting piece is connected with a cable of the charging gun through a channel arranged on the power terminal fixing device.

18. The switch structure for a charging gun according to claim 17, wherein the transit terminal connector has elasticity, and a pressure applied to the first contact by the transit terminal connector when the first contact is brought into contact with the second contact is 5N-95N.

19. The switch structure for a charging gun according to claim 17, wherein an elastic piece is further provided to the power terminal, one end of the elastic piece is connected to an end of the relay terminal connecting piece, and the other end abuts against the second fixing portion.

20. The switch structure for a charging gun according to claim 3, wherein 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 relay terminal through the expansion member.

21. The switch structure for a charging gun according to claim 3, wherein 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 with the corresponding switching terminal through the telescopic piece.

22. The switch structure for a charging gun according to any one of claims 1 to 21, wherein a shortest distance between the first contact and the second contact is equal to or less than a distance by which the push rod pushes the relay terminal to move.

23. A charging gun comprising the switch structure for a charging gun according to any one of claims 1 to 21 and a housing, the terminal fixture, the power terminal fixture and the cable being fixed in the housing.

24. A charging device, comprising the charging gun of claim 23, and a charging socket mated with the charging gun, wherein an ejector rod is disposed in the charging socket, and when the charging gun is mated with the charging socket, the ejector rod abuts against the push rod and pushes the push rod to translate along an axial direction, so as to drive the first contact to contact with the second contact.